Expr.h revision 0b0b77fa29c74c99a77548ed86ca8a04f7cf6b02
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66 /// \brief Construct an empty expression. 67 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 68 69public: 70 QualType getType() const { return TR; } 71 void setType(QualType t) { 72 // In C++, the type of an expression is always adjusted so that it 73 // will not have reference type an expression will never have 74 // reference type (C++ [expr]p6). Use 75 // QualType::getNonReferenceType() to retrieve the non-reference 76 // type. Additionally, inspect Expr::isLvalue to determine whether 77 // an expression that is adjusted in this manner should be 78 // considered an lvalue. 79 assert((TR.isNull() || !TR->isReferenceType()) && 80 "Expressions can't have reference type"); 81 82 TR = t; 83 } 84 85 /// isValueDependent - Determines whether this expression is 86 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 87 /// array bound of "Chars" in the following example is 88 /// value-dependent. 89 /// @code 90 /// template<int Size, char (&Chars)[Size]> struct meta_string; 91 /// @endcode 92 bool isValueDependent() const { return ValueDependent; } 93 94 /// \brief Set whether this expression is value-dependent or not. 95 void setValueDependent(bool VD) { ValueDependent = VD; } 96 97 /// isTypeDependent - Determines whether this expression is 98 /// type-dependent (C++ [temp.dep.expr]), which means that its type 99 /// could change from one template instantiation to the next. For 100 /// example, the expressions "x" and "x + y" are type-dependent in 101 /// the following code, but "y" is not type-dependent: 102 /// @code 103 /// template<typename T> 104 /// void add(T x, int y) { 105 /// x + y; 106 /// } 107 /// @endcode 108 bool isTypeDependent() const { return TypeDependent; } 109 110 /// \brief Set whether this expression is type-dependent or not. 111 void setTypeDependent(bool TD) { TypeDependent = TD; } 112 113 /// SourceLocation tokens are not useful in isolation - they are low level 114 /// value objects created/interpreted by SourceManager. We assume AST 115 /// clients will have a pointer to the respective SourceManager. 116 virtual SourceRange getSourceRange() const = 0; 117 118 /// getExprLoc - Return the preferred location for the arrow when diagnosing 119 /// a problem with a generic expression. 120 virtual SourceLocation getExprLoc() const { return getLocStart(); } 121 122 /// isUnusedResultAWarning - Return true if this immediate expression should 123 /// be warned about if the result is unused. If so, fill in Loc and Ranges 124 /// with location to warn on and the source range[s] to report with the 125 /// warning. 126 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 127 SourceRange &R2) const; 128 129 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 130 /// incomplete type other than void. Nonarray expressions that can be lvalues: 131 /// - name, where name must be a variable 132 /// - e[i] 133 /// - (e), where e must be an lvalue 134 /// - e.name, where e must be an lvalue 135 /// - e->name 136 /// - *e, the type of e cannot be a function type 137 /// - string-constant 138 /// - reference type [C++ [expr]] 139 /// 140 enum isLvalueResult { 141 LV_Valid, 142 LV_NotObjectType, 143 LV_IncompleteVoidType, 144 LV_DuplicateVectorComponents, 145 LV_InvalidExpression, 146 LV_MemberFunction 147 }; 148 isLvalueResult isLvalue(ASTContext &Ctx) const; 149 150 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 151 /// does not have an incomplete type, does not have a const-qualified type, 152 /// and if it is a structure or union, does not have any member (including, 153 /// recursively, any member or element of all contained aggregates or unions) 154 /// with a const-qualified type. 155 /// 156 /// \param Loc [in] [out] - A source location which *may* be filled 157 /// in with the location of the expression making this a 158 /// non-modifiable lvalue, if specified. 159 enum isModifiableLvalueResult { 160 MLV_Valid, 161 MLV_NotObjectType, 162 MLV_IncompleteVoidType, 163 MLV_DuplicateVectorComponents, 164 MLV_InvalidExpression, 165 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 166 MLV_IncompleteType, 167 MLV_ConstQualified, 168 MLV_ArrayType, 169 MLV_NotBlockQualified, 170 MLV_ReadonlyProperty, 171 MLV_NoSetterProperty, 172 MLV_MemberFunction 173 }; 174 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 175 SourceLocation *Loc = 0) const; 176 177 bool isBitField(); 178 179 /// getIntegerConstantExprValue() - Return the value of an integer 180 /// constant expression. The expression must be a valid integer 181 /// constant expression as determined by isIntegerConstantExpr. 182 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 183 llvm::APSInt X; 184 bool success = isIntegerConstantExpr(X, Ctx); 185 success = success; 186 assert(success && "Illegal argument to getIntegerConstantExpr"); 187 return X; 188 } 189 190 /// isIntegerConstantExpr - Return true if this expression is a valid integer 191 /// constant expression, and, if so, return its value in Result. If not a 192 /// valid i-c-e, return false and fill in Loc (if specified) with the location 193 /// of the invalid expression. 194 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 195 SourceLocation *Loc = 0, 196 bool isEvaluated = true) const; 197 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 198 SourceLocation *Loc = 0, 199 bool isEvaluated = true) const; 200 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 201 llvm::APSInt X; 202 return isIntegerConstantExpr(X, Ctx, Loc); 203 } 204 /// isConstantInitializer - Returns true if this expression is a constant 205 /// initializer, which can be emitted at compile-time. 206 bool isConstantInitializer(ASTContext &Ctx) const; 207 208 /// EvalResult is a struct with detailed info about an evaluated expression. 209 struct EvalResult { 210 /// Val - This is the value the expression can be folded to. 211 APValue Val; 212 213 /// HasSideEffects - Whether the evaluated expression has side effects. 214 /// For example, (f() && 0) can be folded, but it still has side effects. 215 bool HasSideEffects; 216 217 /// Diag - If the expression is unfoldable, then Diag contains a note 218 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 219 /// position for the error, and DiagExpr is the expression that caused 220 /// the error. 221 /// If the expression is foldable, but not an integer constant expression, 222 /// Diag contains a note diagnostic that describes why it isn't an integer 223 /// constant expression. If the expression *is* an integer constant 224 /// expression, then Diag will be zero. 225 unsigned Diag; 226 const Expr *DiagExpr; 227 SourceLocation DiagLoc; 228 229 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 230 }; 231 232 /// Evaluate - Return true if this is a constant which we can fold using 233 /// any crazy technique (that has nothing to do with language standards) that 234 /// we want to. If this function returns true, it returns the folded constant 235 /// in Result. 236 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 237 238 /// isEvaluatable - Call Evaluate to see if this expression can be constant 239 /// folded, but discard the result. 240 bool isEvaluatable(ASTContext &Ctx) const; 241 242 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 243 /// must be called on an expression that constant folds to an integer. 244 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 245 246 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 247 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 248 249 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 250 /// integer constant expression with the value zero, or if this is one that is 251 /// cast to void*. 252 bool isNullPointerConstant(ASTContext &Ctx) const; 253 254 /// hasGlobalStorage - Return true if this expression has static storage 255 /// duration. This means that the address of this expression is a link-time 256 /// constant. 257 bool hasGlobalStorage() const; 258 259 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 260 /// write barrier. 261 bool isOBJCGCCandidate() const; 262 263 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 264 /// its subexpression. If that subexpression is also a ParenExpr, 265 /// then this method recursively returns its subexpression, and so forth. 266 /// Otherwise, the method returns the current Expr. 267 Expr* IgnoreParens(); 268 269 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 270 /// or CastExprs, returning their operand. 271 Expr *IgnoreParenCasts(); 272 273 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 274 /// value (including ptr->int casts of the same size). Strip off any 275 /// ParenExpr or CastExprs, returning their operand. 276 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 277 278 const Expr* IgnoreParens() const { 279 return const_cast<Expr*>(this)->IgnoreParens(); 280 } 281 const Expr *IgnoreParenCasts() const { 282 return const_cast<Expr*>(this)->IgnoreParenCasts(); 283 } 284 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 285 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 286 } 287 288 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 289 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 290 291 static bool classof(const Stmt *T) { 292 return T->getStmtClass() >= firstExprConstant && 293 T->getStmtClass() <= lastExprConstant; 294 } 295 static bool classof(const Expr *) { return true; } 296 297 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 298 return cast<Expr>(Stmt::Create(D, C)); 299 } 300}; 301 302 303//===----------------------------------------------------------------------===// 304// Primary Expressions. 305//===----------------------------------------------------------------------===// 306 307/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 308/// enum, etc. 309class DeclRefExpr : public Expr { 310 NamedDecl *D; 311 SourceLocation Loc; 312 313protected: 314 // FIXME: Eventually, this constructor will go away and all subclasses 315 // will have to provide the type- and value-dependent flags. 316 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 317 Expr(SC, t), D(d), Loc(l) {} 318 319 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 320 bool VD) : 321 Expr(SC, t, TD, VD), D(d), Loc(l) {} 322 323public: 324 // FIXME: Eventually, this constructor will go away and all clients 325 // will have to provide the type- and value-dependent flags. 326 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 327 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 328 329 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 330 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 331 332 /// \brief Construct an empty declaration reference expression. 333 explicit DeclRefExpr(EmptyShell Empty) 334 : Expr(DeclRefExprClass, Empty) { } 335 336 NamedDecl *getDecl() { return D; } 337 const NamedDecl *getDecl() const { return D; } 338 void setDecl(NamedDecl *NewD) { D = NewD; } 339 340 SourceLocation getLocation() const { return Loc; } 341 void setLocation(SourceLocation L) { Loc = L; } 342 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 343 344 static bool classof(const Stmt *T) { 345 return T->getStmtClass() == DeclRefExprClass || 346 T->getStmtClass() == CXXConditionDeclExprClass || 347 T->getStmtClass() == QualifiedDeclRefExprClass; 348 } 349 static bool classof(const DeclRefExpr *) { return true; } 350 351 // Iterators 352 virtual child_iterator child_begin(); 353 virtual child_iterator child_end(); 354 355 virtual void EmitImpl(llvm::Serializer& S) const; 356 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 357}; 358 359/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 360class PredefinedExpr : public Expr { 361public: 362 enum IdentType { 363 Func, 364 Function, 365 PrettyFunction 366 }; 367 368private: 369 SourceLocation Loc; 370 IdentType Type; 371public: 372 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 373 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 374 375 /// \brief Construct an empty predefined expression. 376 explicit PredefinedExpr(EmptyShell Empty) 377 : Expr(PredefinedExprClass, Empty) { } 378 379 IdentType getIdentType() const { return Type; } 380 void setIdentType(IdentType IT) { Type = IT; } 381 382 SourceLocation getLocation() const { return Loc; } 383 void setLocation(SourceLocation L) { Loc = L; } 384 385 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 386 387 static bool classof(const Stmt *T) { 388 return T->getStmtClass() == PredefinedExprClass; 389 } 390 static bool classof(const PredefinedExpr *) { return true; } 391 392 // Iterators 393 virtual child_iterator child_begin(); 394 virtual child_iterator child_end(); 395 396 virtual void EmitImpl(llvm::Serializer& S) const; 397 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 398}; 399 400class IntegerLiteral : public Expr { 401 llvm::APInt Value; 402 SourceLocation Loc; 403public: 404 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 405 // or UnsignedLongLongTy 406 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 407 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 408 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 409 } 410 411 /// \brief Construct an empty integer literal. 412 explicit IntegerLiteral(EmptyShell Empty) 413 : Expr(IntegerLiteralClass, Empty) { } 414 415 IntegerLiteral* Clone(ASTContext &C) const; 416 417 const llvm::APInt &getValue() const { return Value; } 418 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 419 420 /// \brief Retrieve the location of the literal. 421 SourceLocation getLocation() const { return Loc; } 422 423 void setValue(const llvm::APInt &Val) { Value = Val; } 424 void setLocation(SourceLocation Location) { Loc = Location; } 425 426 static bool classof(const Stmt *T) { 427 return T->getStmtClass() == IntegerLiteralClass; 428 } 429 static bool classof(const IntegerLiteral *) { return true; } 430 431 // Iterators 432 virtual child_iterator child_begin(); 433 virtual child_iterator child_end(); 434 435 virtual void EmitImpl(llvm::Serializer& S) const; 436 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 437}; 438 439class CharacterLiteral : public Expr { 440 unsigned Value; 441 SourceLocation Loc; 442 bool IsWide; 443public: 444 // type should be IntTy 445 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 446 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 447 } 448 449 /// \brief Construct an empty character literal. 450 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 451 452 SourceLocation getLoc() const { return Loc; } 453 bool isWide() const { return IsWide; } 454 455 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 456 457 unsigned getValue() const { return Value; } 458 459 void setLocation(SourceLocation Location) { Loc = Location; } 460 void setWide(bool W) { IsWide = W; } 461 void setValue(unsigned Val) { Value = Val; } 462 463 static bool classof(const Stmt *T) { 464 return T->getStmtClass() == CharacterLiteralClass; 465 } 466 static bool classof(const CharacterLiteral *) { return true; } 467 468 // Iterators 469 virtual child_iterator child_begin(); 470 virtual child_iterator child_end(); 471 472 virtual void EmitImpl(llvm::Serializer& S) const; 473 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 474}; 475 476class FloatingLiteral : public Expr { 477 llvm::APFloat Value; 478 bool IsExact : 1; 479 SourceLocation Loc; 480public: 481 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 482 QualType Type, SourceLocation L) 483 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 484 485 /// \brief Construct an empty floating-point literal. 486 FloatingLiteral(EmptyShell Empty) 487 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 488 489 const llvm::APFloat &getValue() const { return Value; } 490 void setValue(const llvm::APFloat &Val) { Value = Val; } 491 492 bool isExact() const { return IsExact; } 493 void setExact(bool E) { IsExact = E; } 494 495 /// getValueAsApproximateDouble - This returns the value as an inaccurate 496 /// double. Note that this may cause loss of precision, but is useful for 497 /// debugging dumps, etc. 498 double getValueAsApproximateDouble() const; 499 500 SourceLocation getLocation() const { return Loc; } 501 void setLocation(SourceLocation L) { Loc = L; } 502 503 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 504 505 static bool classof(const Stmt *T) { 506 return T->getStmtClass() == FloatingLiteralClass; 507 } 508 static bool classof(const FloatingLiteral *) { return true; } 509 510 // Iterators 511 virtual child_iterator child_begin(); 512 virtual child_iterator child_end(); 513 514 virtual void EmitImpl(llvm::Serializer& S) const; 515 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 516}; 517 518/// ImaginaryLiteral - We support imaginary integer and floating point literals, 519/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 520/// IntegerLiteral classes. Instances of this class always have a Complex type 521/// whose element type matches the subexpression. 522/// 523class ImaginaryLiteral : public Expr { 524 Stmt *Val; 525public: 526 ImaginaryLiteral(Expr *val, QualType Ty) 527 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 528 529 const Expr *getSubExpr() const { return cast<Expr>(Val); } 530 Expr *getSubExpr() { return cast<Expr>(Val); } 531 532 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 533 static bool classof(const Stmt *T) { 534 return T->getStmtClass() == ImaginaryLiteralClass; 535 } 536 static bool classof(const ImaginaryLiteral *) { return true; } 537 538 // Iterators 539 virtual child_iterator child_begin(); 540 virtual child_iterator child_end(); 541 542 virtual void EmitImpl(llvm::Serializer& S) const; 543 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 544}; 545 546/// StringLiteral - This represents a string literal expression, e.g. "foo" 547/// or L"bar" (wide strings). The actual string is returned by getStrData() 548/// is NOT null-terminated, and the length of the string is determined by 549/// calling getByteLength(). The C type for a string is always a 550/// ConstantArrayType. In C++, the char type is const qualified, in C it is 551/// not. 552/// 553/// Note that strings in C can be formed by concatenation of multiple string 554/// literal pptokens in translation phase #6. This keeps track of the locations 555/// of each of these pieces. 556/// 557/// Strings in C can also be truncated and extended by assigning into arrays, 558/// e.g. with constructs like: 559/// char X[2] = "foobar"; 560/// In this case, getByteLength() will return 6, but the string literal will 561/// have type "char[2]". 562class StringLiteral : public Expr { 563 const char *StrData; 564 unsigned ByteLength; 565 bool IsWide; 566 unsigned NumConcatenated; 567 SourceLocation TokLocs[1]; 568 569 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 570public: 571 /// This is the "fully general" constructor that allows representation of 572 /// strings formed from multiple concatenated tokens. 573 static StringLiteral *Create(ASTContext &C, const char *StrData, 574 unsigned ByteLength, bool Wide, QualType Ty, 575 const SourceLocation *Loc, unsigned NumStrs); 576 577 /// Simple constructor for string literals made from one token. 578 static StringLiteral *Create(ASTContext &C, const char *StrData, 579 unsigned ByteLength, 580 bool Wide, QualType Ty, SourceLocation Loc) { 581 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 582 } 583 584 StringLiteral* Clone(ASTContext &C) const; 585 void Destroy(ASTContext &C); 586 587 const char *getStrData() const { return StrData; } 588 unsigned getByteLength() const { return ByteLength; } 589 bool isWide() const { return IsWide; } 590 bool containsNonAsciiOrNull() const { 591 for (unsigned i = 0; i < getByteLength(); ++i) 592 if (!isascii(getStrData()[i]) || !getStrData()[i]) 593 return true; 594 return false; 595 } 596 /// getNumConcatenated - Get the number of string literal tokens that were 597 /// concatenated in translation phase #6 to form this string literal. 598 unsigned getNumConcatenated() const { return NumConcatenated; } 599 600 SourceLocation getStrTokenLoc(unsigned TokNum) const { 601 assert(TokNum < NumConcatenated && "Invalid tok number"); 602 return TokLocs[TokNum]; 603 } 604 605 typedef const SourceLocation *tokloc_iterator; 606 tokloc_iterator tokloc_begin() const { return TokLocs; } 607 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 608 609 virtual SourceRange getSourceRange() const { 610 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 611 } 612 static bool classof(const Stmt *T) { 613 return T->getStmtClass() == StringLiteralClass; 614 } 615 static bool classof(const StringLiteral *) { return true; } 616 617 // Iterators 618 virtual child_iterator child_begin(); 619 virtual child_iterator child_end(); 620 621 virtual void EmitImpl(llvm::Serializer& S) const; 622 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 623}; 624 625/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 626/// AST node is only formed if full location information is requested. 627class ParenExpr : public Expr { 628 SourceLocation L, R; 629 Stmt *Val; 630public: 631 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 632 : Expr(ParenExprClass, val->getType(), 633 val->isTypeDependent(), val->isValueDependent()), 634 L(l), R(r), Val(val) {} 635 636 /// \brief Construct an empty parenthesized expression. 637 explicit ParenExpr(EmptyShell Empty) 638 : Expr(ParenExprClass, Empty) { } 639 640 const Expr *getSubExpr() const { return cast<Expr>(Val); } 641 Expr *getSubExpr() { return cast<Expr>(Val); } 642 void setSubExpr(Expr *E) { Val = E; } 643 644 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 645 646 /// \brief Get the location of the left parentheses '('. 647 SourceLocation getLParen() const { return L; } 648 void setLParen(SourceLocation Loc) { L = Loc; } 649 650 /// \brief Get the location of the right parentheses ')'. 651 SourceLocation getRParen() const { return R; } 652 void setRParen(SourceLocation Loc) { R = Loc; } 653 654 static bool classof(const Stmt *T) { 655 return T->getStmtClass() == ParenExprClass; 656 } 657 static bool classof(const ParenExpr *) { return true; } 658 659 // Iterators 660 virtual child_iterator child_begin(); 661 virtual child_iterator child_end(); 662 663 virtual void EmitImpl(llvm::Serializer& S) const; 664 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 665}; 666 667 668/// UnaryOperator - This represents the unary-expression's (except sizeof and 669/// alignof), the postinc/postdec operators from postfix-expression, and various 670/// extensions. 671/// 672/// Notes on various nodes: 673/// 674/// Real/Imag - These return the real/imag part of a complex operand. If 675/// applied to a non-complex value, the former returns its operand and the 676/// later returns zero in the type of the operand. 677/// 678/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 679/// subexpression is a compound literal with the various MemberExpr and 680/// ArraySubscriptExpr's applied to it. 681/// 682class UnaryOperator : public Expr { 683public: 684 // Note that additions to this should also update the StmtVisitor class. 685 enum Opcode { 686 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 687 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 688 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 689 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 690 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 691 Real, Imag, // "__real expr"/"__imag expr" Extension. 692 Extension, // __extension__ marker. 693 OffsetOf // __builtin_offsetof 694 }; 695private: 696 Stmt *Val; 697 Opcode Opc; 698 SourceLocation Loc; 699public: 700 701 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 702 : Expr(UnaryOperatorClass, type, 703 input->isTypeDependent() && opc != OffsetOf, 704 input->isValueDependent()), 705 Val(input), Opc(opc), Loc(l) {} 706 707 /// \brief Build an empty unary operator. 708 explicit UnaryOperator(EmptyShell Empty) 709 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 710 711 Opcode getOpcode() const { return Opc; } 712 void setOpcode(Opcode O) { Opc = O; } 713 714 Expr *getSubExpr() const { return cast<Expr>(Val); } 715 void setSubExpr(Expr *E) { Val = E; } 716 717 /// getOperatorLoc - Return the location of the operator. 718 SourceLocation getOperatorLoc() const { return Loc; } 719 void setOperatorLoc(SourceLocation L) { Loc = L; } 720 721 /// isPostfix - Return true if this is a postfix operation, like x++. 722 static bool isPostfix(Opcode Op) { 723 return Op == PostInc || Op == PostDec; 724 } 725 726 /// isPostfix - Return true if this is a prefix operation, like --x. 727 static bool isPrefix(Opcode Op) { 728 return Op == PreInc || Op == PreDec; 729 } 730 731 bool isPrefix() const { return isPrefix(Opc); } 732 bool isPostfix() const { return isPostfix(Opc); } 733 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 734 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 735 bool isOffsetOfOp() const { return Opc == OffsetOf; } 736 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 737 738 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 739 /// corresponds to, e.g. "sizeof" or "[pre]++" 740 static const char *getOpcodeStr(Opcode Op); 741 742 /// \brief Retrieve the unary opcode that corresponds to the given 743 /// overloaded operator. 744 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 745 746 /// \brief Retrieve the overloaded operator kind that corresponds to 747 /// the given unary opcode. 748 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 749 750 virtual SourceRange getSourceRange() const { 751 if (isPostfix()) 752 return SourceRange(Val->getLocStart(), Loc); 753 else 754 return SourceRange(Loc, Val->getLocEnd()); 755 } 756 virtual SourceLocation getExprLoc() const { return Loc; } 757 758 static bool classof(const Stmt *T) { 759 return T->getStmtClass() == UnaryOperatorClass; 760 } 761 static bool classof(const UnaryOperator *) { return true; } 762 763 // Iterators 764 virtual child_iterator child_begin(); 765 virtual child_iterator child_end(); 766 767 virtual void EmitImpl(llvm::Serializer& S) const; 768 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 769}; 770 771/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 772/// types and expressions. 773class SizeOfAlignOfExpr : public Expr { 774 bool isSizeof : 1; // true if sizeof, false if alignof. 775 bool isType : 1; // true if operand is a type, false if an expression 776 union { 777 void *Ty; 778 Stmt *Ex; 779 } Argument; 780 SourceLocation OpLoc, RParenLoc; 781public: 782 SizeOfAlignOfExpr(bool issizeof, QualType T, 783 QualType resultType, SourceLocation op, 784 SourceLocation rp) : 785 Expr(SizeOfAlignOfExprClass, resultType, 786 false, // Never type-dependent (C++ [temp.dep.expr]p3). 787 // Value-dependent if the argument is type-dependent. 788 T->isDependentType()), 789 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 790 Argument.Ty = T.getAsOpaquePtr(); 791 } 792 793 SizeOfAlignOfExpr(bool issizeof, Expr *E, 794 QualType resultType, SourceLocation op, 795 SourceLocation rp) : 796 Expr(SizeOfAlignOfExprClass, resultType, 797 false, // Never type-dependent (C++ [temp.dep.expr]p3). 798 // Value-dependent if the argument is type-dependent. 799 E->isTypeDependent()), 800 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 801 Argument.Ex = E; 802 } 803 804 /// \brief Construct an empty sizeof/alignof expression. 805 explicit SizeOfAlignOfExpr(EmptyShell Empty) 806 : Expr(SizeOfAlignOfExprClass, Empty) { } 807 808 virtual void Destroy(ASTContext& C); 809 810 bool isSizeOf() const { return isSizeof; } 811 void setSizeof(bool S) { isSizeof = S; } 812 813 bool isArgumentType() const { return isType; } 814 QualType getArgumentType() const { 815 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 816 return QualType::getFromOpaquePtr(Argument.Ty); 817 } 818 Expr *getArgumentExpr() { 819 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 820 return static_cast<Expr*>(Argument.Ex); 821 } 822 const Expr *getArgumentExpr() const { 823 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 824 } 825 826 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 827 void setArgument(QualType T) { 828 Argument.Ty = T.getAsOpaquePtr(); 829 isType = true; 830 } 831 832 /// Gets the argument type, or the type of the argument expression, whichever 833 /// is appropriate. 834 QualType getTypeOfArgument() const { 835 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 836 } 837 838 SourceLocation getOperatorLoc() const { return OpLoc; } 839 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 840 841 SourceLocation getRParenLoc() const { return RParenLoc; } 842 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 843 844 virtual SourceRange getSourceRange() const { 845 return SourceRange(OpLoc, RParenLoc); 846 } 847 848 static bool classof(const Stmt *T) { 849 return T->getStmtClass() == SizeOfAlignOfExprClass; 850 } 851 static bool classof(const SizeOfAlignOfExpr *) { return true; } 852 853 // Iterators 854 virtual child_iterator child_begin(); 855 virtual child_iterator child_end(); 856 857 virtual void EmitImpl(llvm::Serializer& S) const; 858 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 859}; 860 861//===----------------------------------------------------------------------===// 862// Postfix Operators. 863//===----------------------------------------------------------------------===// 864 865/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 866class ArraySubscriptExpr : public Expr { 867 enum { LHS, RHS, END_EXPR=2 }; 868 Stmt* SubExprs[END_EXPR]; 869 SourceLocation RBracketLoc; 870public: 871 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 872 SourceLocation rbracketloc) 873 : Expr(ArraySubscriptExprClass, t, 874 lhs->isTypeDependent() || rhs->isTypeDependent(), 875 lhs->isValueDependent() || rhs->isValueDependent()), 876 RBracketLoc(rbracketloc) { 877 SubExprs[LHS] = lhs; 878 SubExprs[RHS] = rhs; 879 } 880 881 /// An array access can be written A[4] or 4[A] (both are equivalent). 882 /// - getBase() and getIdx() always present the normalized view: A[4]. 883 /// In this case getBase() returns "A" and getIdx() returns "4". 884 /// - getLHS() and getRHS() present the syntactic view. e.g. for 885 /// 4[A] getLHS() returns "4". 886 /// Note: Because vector element access is also written A[4] we must 887 /// predicate the format conversion in getBase and getIdx only on the 888 /// the type of the RHS, as it is possible for the LHS to be a vector of 889 /// integer type 890 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 891 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 892 893 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 894 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 895 896 Expr *getBase() { 897 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 898 } 899 900 const Expr *getBase() const { 901 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 902 } 903 904 Expr *getIdx() { 905 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 906 } 907 908 const Expr *getIdx() const { 909 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 910 } 911 912 virtual SourceRange getSourceRange() const { 913 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 914 } 915 916 SourceLocation getRBracketLoc() const { return RBracketLoc; } 917 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 918 919 static bool classof(const Stmt *T) { 920 return T->getStmtClass() == ArraySubscriptExprClass; 921 } 922 static bool classof(const ArraySubscriptExpr *) { return true; } 923 924 // Iterators 925 virtual child_iterator child_begin(); 926 virtual child_iterator child_end(); 927 928 virtual void EmitImpl(llvm::Serializer& S) const; 929 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 930}; 931 932 933/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 934/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 935/// while its subclasses may represent alternative syntax that (semantically) 936/// results in a function call. For example, CXXOperatorCallExpr is 937/// a subclass for overloaded operator calls that use operator syntax, e.g., 938/// "str1 + str2" to resolve to a function call. 939class CallExpr : public Expr { 940 enum { FN=0, ARGS_START=1 }; 941 Stmt **SubExprs; 942 unsigned NumArgs; 943 SourceLocation RParenLoc; 944 945 // This version of the ctor is for deserialization. 946 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 947 SourceLocation rparenloc) 948 : Expr(SC,t), SubExprs(subexprs), 949 NumArgs(numargs), RParenLoc(rparenloc) {} 950 951protected: 952 // This version of the constructor is for derived classes. 953 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 954 QualType t, SourceLocation rparenloc); 955 956public: 957 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 958 SourceLocation rparenloc); 959 960 ~CallExpr() {} 961 962 void Destroy(ASTContext& C); 963 964 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 965 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 966 void setCallee(Expr *F) { SubExprs[FN] = F; } 967 968 /// getNumArgs - Return the number of actual arguments to this call. 969 /// 970 unsigned getNumArgs() const { return NumArgs; } 971 972 /// getArg - Return the specified argument. 973 Expr *getArg(unsigned Arg) { 974 assert(Arg < NumArgs && "Arg access out of range!"); 975 return cast<Expr>(SubExprs[Arg+ARGS_START]); 976 } 977 const Expr *getArg(unsigned Arg) const { 978 assert(Arg < NumArgs && "Arg access out of range!"); 979 return cast<Expr>(SubExprs[Arg+ARGS_START]); 980 } 981 982 // FIXME: Why is this needed? Why not just create the CallExpr with the 983 // corect number of arguments? It makes the ASTs less brittle. 984 /// setArg - Set the specified argument. 985 void setArg(unsigned Arg, Expr *ArgExpr) { 986 assert(Arg < NumArgs && "Arg access out of range!"); 987 SubExprs[Arg+ARGS_START] = ArgExpr; 988 } 989 990 // FIXME: It would be great to just get rid of this. There is only one 991 // callee of this method, and it probably could be refactored to not use 992 // this method and instead just create a CallExpr with the right number of 993 // arguments. 994 /// setNumArgs - This changes the number of arguments present in this call. 995 /// Any orphaned expressions are deleted by this, and any new operands are set 996 /// to null. 997 void setNumArgs(ASTContext& C, unsigned NumArgs); 998 999 typedef ExprIterator arg_iterator; 1000 typedef ConstExprIterator const_arg_iterator; 1001 1002 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1003 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1004 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1005 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1006 1007 /// getNumCommas - Return the number of commas that must have been present in 1008 /// this function call. 1009 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1010 1011 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1012 /// not, return 0. 1013 unsigned isBuiltinCall(ASTContext &Context) const; 1014 1015 SourceLocation getRParenLoc() const { return RParenLoc; } 1016 1017 virtual SourceRange getSourceRange() const { 1018 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1019 } 1020 1021 static bool classof(const Stmt *T) { 1022 return T->getStmtClass() == CallExprClass || 1023 T->getStmtClass() == CXXOperatorCallExprClass || 1024 T->getStmtClass() == CXXMemberCallExprClass; 1025 } 1026 static bool classof(const CallExpr *) { return true; } 1027 static bool classof(const CXXOperatorCallExpr *) { return true; } 1028 static bool classof(const CXXMemberCallExpr *) { return true; } 1029 1030 // Iterators 1031 virtual child_iterator child_begin(); 1032 virtual child_iterator child_end(); 1033 1034 virtual void EmitImpl(llvm::Serializer& S) const; 1035 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 1036 StmtClass SC); 1037}; 1038 1039/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1040/// 1041class MemberExpr : public Expr { 1042 /// Base - the expression for the base pointer or structure references. In 1043 /// X.F, this is "X". 1044 Stmt *Base; 1045 1046 /// MemberDecl - This is the decl being referenced by the field/member name. 1047 /// In X.F, this is the decl referenced by F. 1048 NamedDecl *MemberDecl; 1049 1050 /// MemberLoc - This is the location of the member name. 1051 SourceLocation MemberLoc; 1052 1053 /// IsArrow - True if this is "X->F", false if this is "X.F". 1054 bool IsArrow; 1055public: 1056 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1057 QualType ty) 1058 : Expr(MemberExprClass, ty), 1059 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1060 1061 void setBase(Expr *E) { Base = E; } 1062 Expr *getBase() const { return cast<Expr>(Base); } 1063 1064 /// \brief Retrieve the member declaration to which this expression refers. 1065 /// 1066 /// The returned declaration will either be a FieldDecl or (in C++) 1067 /// a CXXMethodDecl. 1068 NamedDecl *getMemberDecl() const { return MemberDecl; } 1069 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1070 bool isArrow() const { return IsArrow; } 1071 1072 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1073 /// location of 'F'. 1074 SourceLocation getMemberLoc() const { return MemberLoc; } 1075 1076 virtual SourceRange getSourceRange() const { 1077 return SourceRange(getBase()->getLocStart(), MemberLoc); 1078 } 1079 1080 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1081 1082 static bool classof(const Stmt *T) { 1083 return T->getStmtClass() == MemberExprClass; 1084 } 1085 static bool classof(const MemberExpr *) { return true; } 1086 1087 // Iterators 1088 virtual child_iterator child_begin(); 1089 virtual child_iterator child_end(); 1090 1091 virtual void EmitImpl(llvm::Serializer& S) const; 1092 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1093}; 1094 1095/// CompoundLiteralExpr - [C99 6.5.2.5] 1096/// 1097class CompoundLiteralExpr : public Expr { 1098 /// LParenLoc - If non-null, this is the location of the left paren in a 1099 /// compound literal like "(int){4}". This can be null if this is a 1100 /// synthesized compound expression. 1101 SourceLocation LParenLoc; 1102 Stmt *Init; 1103 bool FileScope; 1104public: 1105 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1106 bool fileScope) 1107 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1108 FileScope(fileScope) {} 1109 1110 const Expr *getInitializer() const { return cast<Expr>(Init); } 1111 Expr *getInitializer() { return cast<Expr>(Init); } 1112 1113 bool isFileScope() const { return FileScope; } 1114 1115 SourceLocation getLParenLoc() const { return LParenLoc; } 1116 1117 virtual SourceRange getSourceRange() const { 1118 // FIXME: Init should never be null. 1119 if (!Init) 1120 return SourceRange(); 1121 if (LParenLoc.isInvalid()) 1122 return Init->getSourceRange(); 1123 return SourceRange(LParenLoc, Init->getLocEnd()); 1124 } 1125 1126 static bool classof(const Stmt *T) { 1127 return T->getStmtClass() == CompoundLiteralExprClass; 1128 } 1129 static bool classof(const CompoundLiteralExpr *) { return true; } 1130 1131 // Iterators 1132 virtual child_iterator child_begin(); 1133 virtual child_iterator child_end(); 1134 1135 virtual void EmitImpl(llvm::Serializer& S) const; 1136 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1137}; 1138 1139/// CastExpr - Base class for type casts, including both implicit 1140/// casts (ImplicitCastExpr) and explicit casts that have some 1141/// representation in the source code (ExplicitCastExpr's derived 1142/// classes). 1143class CastExpr : public Expr { 1144 Stmt *Op; 1145protected: 1146 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1147 Expr(SC, ty, 1148 // Cast expressions are type-dependent if the type is 1149 // dependent (C++ [temp.dep.expr]p3). 1150 ty->isDependentType(), 1151 // Cast expressions are value-dependent if the type is 1152 // dependent or if the subexpression is value-dependent. 1153 ty->isDependentType() || (op && op->isValueDependent())), 1154 Op(op) {} 1155 1156 /// \brief Construct an empty cast. 1157 CastExpr(StmtClass SC, EmptyShell Empty) 1158 : Expr(SC, Empty) { } 1159 1160public: 1161 Expr *getSubExpr() { return cast<Expr>(Op); } 1162 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1163 void setSubExpr(Expr *E) { Op = E; } 1164 1165 static bool classof(const Stmt *T) { 1166 StmtClass SC = T->getStmtClass(); 1167 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1168 return true; 1169 1170 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1171 return true; 1172 1173 return false; 1174 } 1175 static bool classof(const CastExpr *) { return true; } 1176 1177 // Iterators 1178 virtual child_iterator child_begin(); 1179 virtual child_iterator child_end(); 1180}; 1181 1182/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1183/// conversions, which have no direct representation in the original 1184/// source code. For example: converting T[]->T*, void f()->void 1185/// (*f)(), float->double, short->int, etc. 1186/// 1187/// In C, implicit casts always produce rvalues. However, in C++, an 1188/// implicit cast whose result is being bound to a reference will be 1189/// an lvalue. For example: 1190/// 1191/// @code 1192/// class Base { }; 1193/// class Derived : public Base { }; 1194/// void f(Derived d) { 1195/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1196/// } 1197/// @endcode 1198class ImplicitCastExpr : public CastExpr { 1199 /// LvalueCast - Whether this cast produces an lvalue. 1200 bool LvalueCast; 1201 1202public: 1203 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1204 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1205 1206 /// \brief Construct an empty implicit cast. 1207 explicit ImplicitCastExpr(EmptyShell Shell) 1208 : CastExpr(ImplicitCastExprClass, Shell) { } 1209 1210 1211 virtual SourceRange getSourceRange() const { 1212 return getSubExpr()->getSourceRange(); 1213 } 1214 1215 /// isLvalueCast - Whether this cast produces an lvalue. 1216 bool isLvalueCast() const { return LvalueCast; } 1217 1218 /// setLvalueCast - Set whether this cast produces an lvalue. 1219 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1220 1221 static bool classof(const Stmt *T) { 1222 return T->getStmtClass() == ImplicitCastExprClass; 1223 } 1224 static bool classof(const ImplicitCastExpr *) { return true; } 1225 1226 virtual void EmitImpl(llvm::Serializer& S) const; 1227 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1228}; 1229 1230/// ExplicitCastExpr - An explicit cast written in the source 1231/// code. 1232/// 1233/// This class is effectively an abstract class, because it provides 1234/// the basic representation of an explicitly-written cast without 1235/// specifying which kind of cast (C cast, functional cast, static 1236/// cast, etc.) was written; specific derived classes represent the 1237/// particular style of cast and its location information. 1238/// 1239/// Unlike implicit casts, explicit cast nodes have two different 1240/// types: the type that was written into the source code, and the 1241/// actual type of the expression as determined by semantic 1242/// analysis. These types may differ slightly. For example, in C++ one 1243/// can cast to a reference type, which indicates that the resulting 1244/// expression will be an lvalue. The reference type, however, will 1245/// not be used as the type of the expression. 1246class ExplicitCastExpr : public CastExpr { 1247 /// TypeAsWritten - The type that this expression is casting to, as 1248 /// written in the source code. 1249 QualType TypeAsWritten; 1250 1251protected: 1252 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1253 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1254 1255 /// \brief Construct an empty explicit cast. 1256 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1257 : CastExpr(SC, Shell) { } 1258 1259public: 1260 /// getTypeAsWritten - Returns the type that this expression is 1261 /// casting to, as written in the source code. 1262 QualType getTypeAsWritten() const { return TypeAsWritten; } 1263 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1264 1265 static bool classof(const Stmt *T) { 1266 StmtClass SC = T->getStmtClass(); 1267 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1268 return true; 1269 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1270 return true; 1271 1272 return false; 1273 } 1274 static bool classof(const ExplicitCastExpr *) { return true; } 1275}; 1276 1277/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1278/// cast in C++ (C++ [expr.cast]), which uses the syntax 1279/// (Type)expr. For example: @c (int)f. 1280class CStyleCastExpr : public ExplicitCastExpr { 1281 SourceLocation LPLoc; // the location of the left paren 1282 SourceLocation RPLoc; // the location of the right paren 1283public: 1284 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1285 SourceLocation l, SourceLocation r) : 1286 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1287 LPLoc(l), RPLoc(r) {} 1288 1289 /// \brief Construct an empty C-style explicit cast. 1290 explicit CStyleCastExpr(EmptyShell Shell) 1291 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1292 1293 SourceLocation getLParenLoc() const { return LPLoc; } 1294 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1295 1296 SourceLocation getRParenLoc() const { return RPLoc; } 1297 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1298 1299 virtual SourceRange getSourceRange() const { 1300 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1301 } 1302 static bool classof(const Stmt *T) { 1303 return T->getStmtClass() == CStyleCastExprClass; 1304 } 1305 static bool classof(const CStyleCastExpr *) { return true; } 1306 1307 virtual void EmitImpl(llvm::Serializer& S) const; 1308 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1309}; 1310 1311/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1312/// 1313/// This expression node kind describes a builtin binary operation, 1314/// such as "x + y" for integer values "x" and "y". The operands will 1315/// already have been converted to appropriate types (e.g., by 1316/// performing promotions or conversions). 1317/// 1318/// In C++, where operators may be overloaded, a different kind of 1319/// expression node (CXXOperatorCallExpr) is used to express the 1320/// invocation of an overloaded operator with operator syntax. Within 1321/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1322/// used to store an expression "x + y" depends on the subexpressions 1323/// for x and y. If neither x or y is type-dependent, and the "+" 1324/// operator resolves to a built-in operation, BinaryOperator will be 1325/// used to express the computation (x and y may still be 1326/// value-dependent). If either x or y is type-dependent, or if the 1327/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1328/// be used to express the computation. 1329class BinaryOperator : public Expr { 1330public: 1331 enum Opcode { 1332 // Operators listed in order of precedence. 1333 // Note that additions to this should also update the StmtVisitor class. 1334 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1335 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1336 Add, Sub, // [C99 6.5.6] Additive operators. 1337 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1338 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1339 EQ, NE, // [C99 6.5.9] Equality operators. 1340 And, // [C99 6.5.10] Bitwise AND operator. 1341 Xor, // [C99 6.5.11] Bitwise XOR operator. 1342 Or, // [C99 6.5.12] Bitwise OR operator. 1343 LAnd, // [C99 6.5.13] Logical AND operator. 1344 LOr, // [C99 6.5.14] Logical OR operator. 1345 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1346 DivAssign, RemAssign, 1347 AddAssign, SubAssign, 1348 ShlAssign, ShrAssign, 1349 AndAssign, XorAssign, 1350 OrAssign, 1351 Comma // [C99 6.5.17] Comma operator. 1352 }; 1353private: 1354 enum { LHS, RHS, END_EXPR }; 1355 Stmt* SubExprs[END_EXPR]; 1356 Opcode Opc; 1357 SourceLocation OpLoc; 1358public: 1359 1360 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1361 SourceLocation opLoc) 1362 : Expr(BinaryOperatorClass, ResTy, 1363 lhs->isTypeDependent() || rhs->isTypeDependent(), 1364 lhs->isValueDependent() || rhs->isValueDependent()), 1365 Opc(opc), OpLoc(opLoc) { 1366 SubExprs[LHS] = lhs; 1367 SubExprs[RHS] = rhs; 1368 assert(!isCompoundAssignmentOp() && 1369 "Use ArithAssignBinaryOperator for compound assignments"); 1370 } 1371 1372 /// \brief Construct an empty binary operator. 1373 explicit BinaryOperator(EmptyShell Empty) 1374 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1375 1376 SourceLocation getOperatorLoc() const { return OpLoc; } 1377 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1378 1379 Opcode getOpcode() const { return Opc; } 1380 void setOpcode(Opcode O) { Opc = O; } 1381 1382 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1383 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1384 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1385 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1386 1387 virtual SourceRange getSourceRange() const { 1388 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1389 } 1390 1391 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1392 /// corresponds to, e.g. "<<=". 1393 static const char *getOpcodeStr(Opcode Op); 1394 1395 /// \brief Retrieve the binary opcode that corresponds to the given 1396 /// overloaded operator. 1397 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1398 1399 /// \brief Retrieve the overloaded operator kind that corresponds to 1400 /// the given binary opcode. 1401 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1402 1403 /// predicates to categorize the respective opcodes. 1404 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1405 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1406 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1407 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1408 1409 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1410 bool isRelationalOp() const { return isRelationalOp(Opc); } 1411 1412 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1413 bool isEqualityOp() const { return isEqualityOp(Opc); } 1414 1415 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1416 bool isLogicalOp() const { return isLogicalOp(Opc); } 1417 1418 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1419 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1420 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1421 1422 static bool classof(const Stmt *S) { 1423 return S->getStmtClass() == BinaryOperatorClass || 1424 S->getStmtClass() == CompoundAssignOperatorClass; 1425 } 1426 static bool classof(const BinaryOperator *) { return true; } 1427 1428 // Iterators 1429 virtual child_iterator child_begin(); 1430 virtual child_iterator child_end(); 1431 1432 virtual void EmitImpl(llvm::Serializer& S) const; 1433 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1434 1435protected: 1436 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1437 SourceLocation oploc, bool dead) 1438 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1439 SubExprs[LHS] = lhs; 1440 SubExprs[RHS] = rhs; 1441 } 1442}; 1443 1444/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1445/// track of the type the operation is performed in. Due to the semantics of 1446/// these operators, the operands are promoted, the aritmetic performed, an 1447/// implicit conversion back to the result type done, then the assignment takes 1448/// place. This captures the intermediate type which the computation is done 1449/// in. 1450class CompoundAssignOperator : public BinaryOperator { 1451 QualType ComputationLHSType; 1452 QualType ComputationResultType; 1453public: 1454 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1455 QualType ResType, QualType CompLHSType, 1456 QualType CompResultType, 1457 SourceLocation OpLoc) 1458 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1459 ComputationLHSType(CompLHSType), 1460 ComputationResultType(CompResultType) { 1461 assert(isCompoundAssignmentOp() && 1462 "Only should be used for compound assignments"); 1463 } 1464 1465 // The two computation types are the type the LHS is converted 1466 // to for the computation and the type of the result; the two are 1467 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1468 QualType getComputationLHSType() const { return ComputationLHSType; } 1469 QualType getComputationResultType() const { return ComputationResultType; } 1470 1471 static bool classof(const CompoundAssignOperator *) { return true; } 1472 static bool classof(const Stmt *S) { 1473 return S->getStmtClass() == CompoundAssignOperatorClass; 1474 } 1475 1476 virtual void EmitImpl(llvm::Serializer& S) const; 1477 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1478 ASTContext& C); 1479}; 1480 1481/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1482/// GNU "missing LHS" extension is in use. 1483/// 1484class ConditionalOperator : public Expr { 1485 enum { COND, LHS, RHS, END_EXPR }; 1486 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1487public: 1488 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1489 : Expr(ConditionalOperatorClass, t, 1490 // FIXME: the type of the conditional operator doesn't 1491 // depend on the type of the conditional, but the standard 1492 // seems to imply that it could. File a bug! 1493 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1494 (cond->isValueDependent() || 1495 (lhs && lhs->isValueDependent()) || 1496 (rhs && rhs->isValueDependent()))) { 1497 SubExprs[COND] = cond; 1498 SubExprs[LHS] = lhs; 1499 SubExprs[RHS] = rhs; 1500 } 1501 1502 // getCond - Return the expression representing the condition for 1503 // the ?: operator. 1504 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1505 1506 // getTrueExpr - Return the subexpression representing the value of the ?: 1507 // expression if the condition evaluates to true. In most cases this value 1508 // will be the same as getLHS() except a GCC extension allows the left 1509 // subexpression to be omitted, and instead of the condition be returned. 1510 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1511 // is only evaluated once. 1512 Expr *getTrueExpr() const { 1513 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1514 } 1515 1516 // getTrueExpr - Return the subexpression representing the value of the ?: 1517 // expression if the condition evaluates to false. This is the same as getRHS. 1518 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1519 1520 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1521 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1522 1523 virtual SourceRange getSourceRange() const { 1524 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1525 } 1526 static bool classof(const Stmt *T) { 1527 return T->getStmtClass() == ConditionalOperatorClass; 1528 } 1529 static bool classof(const ConditionalOperator *) { return true; } 1530 1531 // Iterators 1532 virtual child_iterator child_begin(); 1533 virtual child_iterator child_end(); 1534 1535 virtual void EmitImpl(llvm::Serializer& S) const; 1536 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1537}; 1538 1539/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1540class AddrLabelExpr : public Expr { 1541 SourceLocation AmpAmpLoc, LabelLoc; 1542 LabelStmt *Label; 1543public: 1544 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1545 QualType t) 1546 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1547 1548 virtual SourceRange getSourceRange() const { 1549 return SourceRange(AmpAmpLoc, LabelLoc); 1550 } 1551 1552 LabelStmt *getLabel() const { return Label; } 1553 1554 static bool classof(const Stmt *T) { 1555 return T->getStmtClass() == AddrLabelExprClass; 1556 } 1557 static bool classof(const AddrLabelExpr *) { return true; } 1558 1559 // Iterators 1560 virtual child_iterator child_begin(); 1561 virtual child_iterator child_end(); 1562 1563 virtual void EmitImpl(llvm::Serializer& S) const; 1564 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1565}; 1566 1567/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1568/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1569/// takes the value of the last subexpression. 1570class StmtExpr : public Expr { 1571 Stmt *SubStmt; 1572 SourceLocation LParenLoc, RParenLoc; 1573public: 1574 StmtExpr(CompoundStmt *substmt, QualType T, 1575 SourceLocation lp, SourceLocation rp) : 1576 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1577 1578 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1579 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1580 1581 virtual SourceRange getSourceRange() const { 1582 return SourceRange(LParenLoc, RParenLoc); 1583 } 1584 1585 SourceLocation getLParenLoc() const { return LParenLoc; } 1586 SourceLocation getRParenLoc() const { return RParenLoc; } 1587 1588 static bool classof(const Stmt *T) { 1589 return T->getStmtClass() == StmtExprClass; 1590 } 1591 static bool classof(const StmtExpr *) { return true; } 1592 1593 // Iterators 1594 virtual child_iterator child_begin(); 1595 virtual child_iterator child_end(); 1596 1597 virtual void EmitImpl(llvm::Serializer& S) const; 1598 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1599}; 1600 1601/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1602/// This AST node represents a function that returns 1 if two *types* (not 1603/// expressions) are compatible. The result of this built-in function can be 1604/// used in integer constant expressions. 1605class TypesCompatibleExpr : public Expr { 1606 QualType Type1; 1607 QualType Type2; 1608 SourceLocation BuiltinLoc, RParenLoc; 1609public: 1610 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1611 QualType t1, QualType t2, SourceLocation RP) : 1612 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1613 BuiltinLoc(BLoc), RParenLoc(RP) {} 1614 1615 QualType getArgType1() const { return Type1; } 1616 QualType getArgType2() const { return Type2; } 1617 1618 virtual SourceRange getSourceRange() const { 1619 return SourceRange(BuiltinLoc, RParenLoc); 1620 } 1621 static bool classof(const Stmt *T) { 1622 return T->getStmtClass() == TypesCompatibleExprClass; 1623 } 1624 static bool classof(const TypesCompatibleExpr *) { return true; } 1625 1626 // Iterators 1627 virtual child_iterator child_begin(); 1628 virtual child_iterator child_end(); 1629 1630 virtual void EmitImpl(llvm::Serializer& S) const; 1631 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1632}; 1633 1634/// ShuffleVectorExpr - clang-specific builtin-in function 1635/// __builtin_shufflevector. 1636/// This AST node represents a operator that does a constant 1637/// shuffle, similar to LLVM's shufflevector instruction. It takes 1638/// two vectors and a variable number of constant indices, 1639/// and returns the appropriately shuffled vector. 1640class ShuffleVectorExpr : public Expr { 1641 SourceLocation BuiltinLoc, RParenLoc; 1642 1643 // SubExprs - the list of values passed to the __builtin_shufflevector 1644 // function. The first two are vectors, and the rest are constant 1645 // indices. The number of values in this list is always 1646 // 2+the number of indices in the vector type. 1647 Stmt **SubExprs; 1648 unsigned NumExprs; 1649 1650public: 1651 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1652 QualType Type, SourceLocation BLoc, 1653 SourceLocation RP) : 1654 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1655 RParenLoc(RP), NumExprs(nexpr) { 1656 1657 SubExprs = new Stmt*[nexpr]; 1658 for (unsigned i = 0; i < nexpr; i++) 1659 SubExprs[i] = args[i]; 1660 } 1661 1662 virtual SourceRange getSourceRange() const { 1663 return SourceRange(BuiltinLoc, RParenLoc); 1664 } 1665 static bool classof(const Stmt *T) { 1666 return T->getStmtClass() == ShuffleVectorExprClass; 1667 } 1668 static bool classof(const ShuffleVectorExpr *) { return true; } 1669 1670 ~ShuffleVectorExpr() { 1671 delete [] SubExprs; 1672 } 1673 1674 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1675 /// constant expression, the actual arguments passed in, and the function 1676 /// pointers. 1677 unsigned getNumSubExprs() const { return NumExprs; } 1678 1679 /// getExpr - Return the Expr at the specified index. 1680 Expr *getExpr(unsigned Index) { 1681 assert((Index < NumExprs) && "Arg access out of range!"); 1682 return cast<Expr>(SubExprs[Index]); 1683 } 1684 const Expr *getExpr(unsigned Index) const { 1685 assert((Index < NumExprs) && "Arg access out of range!"); 1686 return cast<Expr>(SubExprs[Index]); 1687 } 1688 1689 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1690 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1691 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1692 } 1693 1694 // Iterators 1695 virtual child_iterator child_begin(); 1696 virtual child_iterator child_end(); 1697 1698 virtual void EmitImpl(llvm::Serializer& S) const; 1699 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1700}; 1701 1702/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1703/// This AST node is similar to the conditional operator (?:) in C, with 1704/// the following exceptions: 1705/// - the test expression must be a integer constant expression. 1706/// - the expression returned acts like the chosen subexpression in every 1707/// visible way: the type is the same as that of the chosen subexpression, 1708/// and all predicates (whether it's an l-value, whether it's an integer 1709/// constant expression, etc.) return the same result as for the chosen 1710/// sub-expression. 1711class ChooseExpr : public Expr { 1712 enum { COND, LHS, RHS, END_EXPR }; 1713 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1714 SourceLocation BuiltinLoc, RParenLoc; 1715public: 1716 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1717 SourceLocation RP) 1718 : Expr(ChooseExprClass, t), 1719 BuiltinLoc(BLoc), RParenLoc(RP) { 1720 SubExprs[COND] = cond; 1721 SubExprs[LHS] = lhs; 1722 SubExprs[RHS] = rhs; 1723 } 1724 1725 /// isConditionTrue - Return whether the condition is true (i.e. not 1726 /// equal to zero). 1727 bool isConditionTrue(ASTContext &C) const; 1728 1729 /// getChosenSubExpr - Return the subexpression chosen according to the 1730 /// condition. 1731 Expr *getChosenSubExpr(ASTContext &C) const { 1732 return isConditionTrue(C) ? getLHS() : getRHS(); 1733 } 1734 1735 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1736 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1737 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1738 1739 virtual SourceRange getSourceRange() const { 1740 return SourceRange(BuiltinLoc, RParenLoc); 1741 } 1742 static bool classof(const Stmt *T) { 1743 return T->getStmtClass() == ChooseExprClass; 1744 } 1745 static bool classof(const ChooseExpr *) { return true; } 1746 1747 // Iterators 1748 virtual child_iterator child_begin(); 1749 virtual child_iterator child_end(); 1750 1751 virtual void EmitImpl(llvm::Serializer& S) const; 1752 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1753}; 1754 1755/// GNUNullExpr - Implements the GNU __null extension, which is a name 1756/// for a null pointer constant that has integral type (e.g., int or 1757/// long) and is the same size and alignment as a pointer. The __null 1758/// extension is typically only used by system headers, which define 1759/// NULL as __null in C++ rather than using 0 (which is an integer 1760/// that may not match the size of a pointer). 1761class GNUNullExpr : public Expr { 1762 /// TokenLoc - The location of the __null keyword. 1763 SourceLocation TokenLoc; 1764 1765public: 1766 GNUNullExpr(QualType Ty, SourceLocation Loc) 1767 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1768 1769 /// getTokenLocation - The location of the __null token. 1770 SourceLocation getTokenLocation() const { return TokenLoc; } 1771 1772 virtual SourceRange getSourceRange() const { 1773 return SourceRange(TokenLoc); 1774 } 1775 static bool classof(const Stmt *T) { 1776 return T->getStmtClass() == GNUNullExprClass; 1777 } 1778 static bool classof(const GNUNullExpr *) { return true; } 1779 1780 // Iterators 1781 virtual child_iterator child_begin(); 1782 virtual child_iterator child_end(); 1783 1784 virtual void EmitImpl(llvm::Serializer& S) const; 1785 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1786}; 1787 1788/// VAArgExpr, used for the builtin function __builtin_va_start. 1789class VAArgExpr : public Expr { 1790 Stmt *Val; 1791 SourceLocation BuiltinLoc, RParenLoc; 1792public: 1793 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1794 : Expr(VAArgExprClass, t), 1795 Val(e), 1796 BuiltinLoc(BLoc), 1797 RParenLoc(RPLoc) { } 1798 1799 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1800 Expr *getSubExpr() { return cast<Expr>(Val); } 1801 virtual SourceRange getSourceRange() const { 1802 return SourceRange(BuiltinLoc, RParenLoc); 1803 } 1804 static bool classof(const Stmt *T) { 1805 return T->getStmtClass() == VAArgExprClass; 1806 } 1807 static bool classof(const VAArgExpr *) { return true; } 1808 1809 // Iterators 1810 virtual child_iterator child_begin(); 1811 virtual child_iterator child_end(); 1812 1813 virtual void EmitImpl(llvm::Serializer& S) const; 1814 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1815}; 1816 1817/// @brief Describes an C or C++ initializer list. 1818/// 1819/// InitListExpr describes an initializer list, which can be used to 1820/// initialize objects of different types, including 1821/// struct/class/union types, arrays, and vectors. For example: 1822/// 1823/// @code 1824/// struct foo x = { 1, { 2, 3 } }; 1825/// @endcode 1826/// 1827/// Prior to semantic analysis, an initializer list will represent the 1828/// initializer list as written by the user, but will have the 1829/// placeholder type "void". This initializer list is called the 1830/// syntactic form of the initializer, and may contain C99 designated 1831/// initializers (represented as DesignatedInitExprs), initializations 1832/// of subobject members without explicit braces, and so on. Clients 1833/// interested in the original syntax of the initializer list should 1834/// use the syntactic form of the initializer list. 1835/// 1836/// After semantic analysis, the initializer list will represent the 1837/// semantic form of the initializer, where the initializations of all 1838/// subobjects are made explicit with nested InitListExpr nodes and 1839/// C99 designators have been eliminated by placing the designated 1840/// initializations into the subobject they initialize. Additionally, 1841/// any "holes" in the initialization, where no initializer has been 1842/// specified for a particular subobject, will be replaced with 1843/// implicitly-generated ImplicitValueInitExpr expressions that 1844/// value-initialize the subobjects. Note, however, that the 1845/// initializer lists may still have fewer initializers than there are 1846/// elements to initialize within the object. 1847/// 1848/// Given the semantic form of the initializer list, one can retrieve 1849/// the original syntactic form of that initializer list (if it 1850/// exists) using getSyntacticForm(). Since many initializer lists 1851/// have the same syntactic and semantic forms, getSyntacticForm() may 1852/// return NULL, indicating that the current initializer list also 1853/// serves as its syntactic form. 1854class InitListExpr : public Expr { 1855 std::vector<Stmt *> InitExprs; 1856 SourceLocation LBraceLoc, RBraceLoc; 1857 1858 /// Contains the initializer list that describes the syntactic form 1859 /// written in the source code. 1860 InitListExpr *SyntacticForm; 1861 1862 /// If this initializer list initializes a union, specifies which 1863 /// field within the union will be initialized. 1864 FieldDecl *UnionFieldInit; 1865 1866 /// Whether this initializer list originally had a GNU array-range 1867 /// designator in it. This is a temporary marker used by CodeGen. 1868 bool HadArrayRangeDesignator; 1869 1870public: 1871 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1872 SourceLocation rbraceloc); 1873 1874 unsigned getNumInits() const { return InitExprs.size(); } 1875 1876 const Expr* getInit(unsigned Init) const { 1877 assert(Init < getNumInits() && "Initializer access out of range!"); 1878 return cast_or_null<Expr>(InitExprs[Init]); 1879 } 1880 1881 Expr* getInit(unsigned Init) { 1882 assert(Init < getNumInits() && "Initializer access out of range!"); 1883 return cast_or_null<Expr>(InitExprs[Init]); 1884 } 1885 1886 void setInit(unsigned Init, Expr *expr) { 1887 assert(Init < getNumInits() && "Initializer access out of range!"); 1888 InitExprs[Init] = expr; 1889 } 1890 1891 /// \brief Reserve space for some number of initializers. 1892 void reserveInits(unsigned NumInits); 1893 1894 /// @brief Specify the number of initializers 1895 /// 1896 /// If there are more than @p NumInits initializers, the remaining 1897 /// initializers will be destroyed. If there are fewer than @p 1898 /// NumInits initializers, NULL expressions will be added for the 1899 /// unknown initializers. 1900 void resizeInits(ASTContext &Context, unsigned NumInits); 1901 1902 /// @brief Updates the initializer at index @p Init with the new 1903 /// expression @p expr, and returns the old expression at that 1904 /// location. 1905 /// 1906 /// When @p Init is out of range for this initializer list, the 1907 /// initializer list will be extended with NULL expressions to 1908 /// accomodate the new entry. 1909 Expr *updateInit(unsigned Init, Expr *expr); 1910 1911 /// \brief If this initializes a union, specifies which field in the 1912 /// union to initialize. 1913 /// 1914 /// Typically, this field is the first named field within the 1915 /// union. However, a designated initializer can specify the 1916 /// initialization of a different field within the union. 1917 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1918 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1919 1920 // Explicit InitListExpr's originate from source code (and have valid source 1921 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1922 bool isExplicit() { 1923 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1924 } 1925 1926 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1927 1928 /// @brief Retrieve the initializer list that describes the 1929 /// syntactic form of the initializer. 1930 /// 1931 /// 1932 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1933 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1934 1935 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1936 void sawArrayRangeDesignator() { 1937 HadArrayRangeDesignator = true; 1938 } 1939 1940 virtual SourceRange getSourceRange() const { 1941 return SourceRange(LBraceLoc, RBraceLoc); 1942 } 1943 static bool classof(const Stmt *T) { 1944 return T->getStmtClass() == InitListExprClass; 1945 } 1946 static bool classof(const InitListExpr *) { return true; } 1947 1948 // Iterators 1949 virtual child_iterator child_begin(); 1950 virtual child_iterator child_end(); 1951 1952 typedef std::vector<Stmt *>::iterator iterator; 1953 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1954 1955 iterator begin() { return InitExprs.begin(); } 1956 iterator end() { return InitExprs.end(); } 1957 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1958 reverse_iterator rend() { return InitExprs.rend(); } 1959 1960 // Serailization. 1961 virtual void EmitImpl(llvm::Serializer& S) const; 1962 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1963 1964private: 1965 // Used by serializer. 1966 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1967}; 1968 1969/// @brief Represents a C99 designated initializer expression. 1970/// 1971/// A designated initializer expression (C99 6.7.8) contains one or 1972/// more designators (which can be field designators, array 1973/// designators, or GNU array-range designators) followed by an 1974/// expression that initializes the field or element(s) that the 1975/// designators refer to. For example, given: 1976/// 1977/// @code 1978/// struct point { 1979/// double x; 1980/// double y; 1981/// }; 1982/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1983/// @endcode 1984/// 1985/// The InitListExpr contains three DesignatedInitExprs, the first of 1986/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1987/// designators, one array designator for @c [2] followed by one field 1988/// designator for @c .y. The initalization expression will be 1.0. 1989class DesignatedInitExpr : public Expr { 1990public: 1991 /// \brief Forward declaration of the Designator class. 1992 class Designator; 1993 1994private: 1995 /// The location of the '=' or ':' prior to the actual initializer 1996 /// expression. 1997 SourceLocation EqualOrColonLoc; 1998 1999 /// Whether this designated initializer used the GNU deprecated 2000 /// syntax rather than the C99 '=' syntax. 2001 bool GNUSyntax : 1; 2002 2003 /// The number of designators in this initializer expression. 2004 unsigned NumDesignators : 15; 2005 2006 /// \brief The designators in this designated initialization 2007 /// expression. 2008 Designator *Designators; 2009 2010 /// The number of subexpressions of this initializer expression, 2011 /// which contains both the initializer and any additional 2012 /// expressions used by array and array-range designators. 2013 unsigned NumSubExprs : 16; 2014 2015 2016 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2017 const Designator *Designators, 2018 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2019 unsigned NumSubExprs); 2020 2021public: 2022 /// A field designator, e.g., ".x". 2023 struct FieldDesignator { 2024 /// Refers to the field that is being initialized. The low bit 2025 /// of this field determines whether this is actually a pointer 2026 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2027 /// initially constructed, a field designator will store an 2028 /// IdentifierInfo*. After semantic analysis has resolved that 2029 /// name, the field designator will instead store a FieldDecl*. 2030 uintptr_t NameOrField; 2031 2032 /// The location of the '.' in the designated initializer. 2033 unsigned DotLoc; 2034 2035 /// The location of the field name in the designated initializer. 2036 unsigned FieldLoc; 2037 }; 2038 2039 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2040 struct ArrayOrRangeDesignator { 2041 /// Location of the first index expression within the designated 2042 /// initializer expression's list of subexpressions. 2043 unsigned Index; 2044 /// The location of the '[' starting the array range designator. 2045 unsigned LBracketLoc; 2046 /// The location of the ellipsis separating the start and end 2047 /// indices. Only valid for GNU array-range designators. 2048 unsigned EllipsisLoc; 2049 /// The location of the ']' terminating the array range designator. 2050 unsigned RBracketLoc; 2051 }; 2052 2053 /// @brief Represents a single C99 designator. 2054 /// 2055 /// @todo This class is infuriatingly similar to clang::Designator, 2056 /// but minor differences (storing indices vs. storing pointers) 2057 /// keep us from reusing it. Try harder, later, to rectify these 2058 /// differences. 2059 class Designator { 2060 /// @brief The kind of designator this describes. 2061 enum { 2062 FieldDesignator, 2063 ArrayDesignator, 2064 ArrayRangeDesignator 2065 } Kind; 2066 2067 union { 2068 /// A field designator, e.g., ".x". 2069 struct FieldDesignator Field; 2070 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2071 struct ArrayOrRangeDesignator ArrayOrRange; 2072 }; 2073 friend class DesignatedInitExpr; 2074 2075 public: 2076 Designator() {} 2077 2078 /// @brief Initializes a field designator. 2079 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2080 SourceLocation FieldLoc) 2081 : Kind(FieldDesignator) { 2082 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2083 Field.DotLoc = DotLoc.getRawEncoding(); 2084 Field.FieldLoc = FieldLoc.getRawEncoding(); 2085 } 2086 2087 /// @brief Initializes an array designator. 2088 Designator(unsigned Index, SourceLocation LBracketLoc, 2089 SourceLocation RBracketLoc) 2090 : Kind(ArrayDesignator) { 2091 ArrayOrRange.Index = Index; 2092 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2093 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2094 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2095 } 2096 2097 /// @brief Initializes a GNU array-range designator. 2098 Designator(unsigned Index, SourceLocation LBracketLoc, 2099 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2100 : Kind(ArrayRangeDesignator) { 2101 ArrayOrRange.Index = Index; 2102 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2103 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2104 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2105 } 2106 2107 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2108 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2109 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2110 2111 IdentifierInfo * getFieldName(); 2112 2113 FieldDecl *getField() { 2114 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2115 if (Field.NameOrField & 0x01) 2116 return 0; 2117 else 2118 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2119 } 2120 2121 void setField(FieldDecl *FD) { 2122 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2123 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2124 } 2125 2126 SourceLocation getDotLoc() const { 2127 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2128 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2129 } 2130 2131 SourceLocation getFieldLoc() const { 2132 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2133 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2134 } 2135 2136 SourceLocation getLBracketLoc() const { 2137 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2138 "Only valid on an array or array-range designator"); 2139 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2140 } 2141 2142 SourceLocation getRBracketLoc() const { 2143 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2144 "Only valid on an array or array-range designator"); 2145 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2146 } 2147 2148 SourceLocation getEllipsisLoc() const { 2149 assert(Kind == ArrayRangeDesignator && 2150 "Only valid on an array-range designator"); 2151 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2152 } 2153 2154 SourceLocation getStartLocation() const { 2155 if (Kind == FieldDesignator) 2156 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2157 else 2158 return getLBracketLoc(); 2159 } 2160 }; 2161 2162 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2163 unsigned NumDesignators, 2164 Expr **IndexExprs, unsigned NumIndexExprs, 2165 SourceLocation EqualOrColonLoc, 2166 bool GNUSyntax, Expr *Init); 2167 2168 /// @brief Returns the number of designators in this initializer. 2169 unsigned size() const { return NumDesignators; } 2170 2171 // Iterator access to the designators. 2172 typedef Designator* designators_iterator; 2173 designators_iterator designators_begin() { return Designators; } 2174 designators_iterator designators_end() { 2175 return Designators + NumDesignators; 2176 } 2177 2178 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2179 2180 Expr *getArrayIndex(const Designator& D); 2181 Expr *getArrayRangeStart(const Designator& D); 2182 Expr *getArrayRangeEnd(const Designator& D); 2183 2184 /// @brief Retrieve the location of the '=' that precedes the 2185 /// initializer value itself, if present. 2186 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2187 2188 /// @brief Determines whether this designated initializer used the 2189 /// deprecated GNU syntax for designated initializers. 2190 bool usesGNUSyntax() const { return GNUSyntax; } 2191 2192 /// @brief Retrieve the initializer value. 2193 Expr *getInit() const { 2194 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2195 } 2196 2197 void setInit(Expr *init) { 2198 *child_begin() = init; 2199 } 2200 2201 /// \brief Replaces the designator at index @p Idx with the series 2202 /// of designators in [First, Last). 2203 void ExpandDesignator(unsigned Idx, const Designator *First, 2204 const Designator *Last); 2205 2206 virtual SourceRange getSourceRange() const; 2207 2208 virtual void Destroy(ASTContext &C); 2209 2210 static bool classof(const Stmt *T) { 2211 return T->getStmtClass() == DesignatedInitExprClass; 2212 } 2213 static bool classof(const DesignatedInitExpr *) { return true; } 2214 2215 // Iterators 2216 virtual child_iterator child_begin(); 2217 virtual child_iterator child_end(); 2218}; 2219 2220/// \brief Represents an implicitly-generated value initialization of 2221/// an object of a given type. 2222/// 2223/// Implicit value initializations occur within semantic initializer 2224/// list expressions (InitListExpr) as placeholders for subobject 2225/// initializations not explicitly specified by the user. 2226/// 2227/// \see InitListExpr 2228class ImplicitValueInitExpr : public Expr { 2229public: 2230 explicit ImplicitValueInitExpr(QualType ty) 2231 : Expr(ImplicitValueInitExprClass, ty) { } 2232 2233 static bool classof(const Stmt *T) { 2234 return T->getStmtClass() == ImplicitValueInitExprClass; 2235 } 2236 static bool classof(const ImplicitValueInitExpr *) { return true; } 2237 2238 virtual SourceRange getSourceRange() const { 2239 return SourceRange(); 2240 } 2241 2242 // Iterators 2243 virtual child_iterator child_begin(); 2244 virtual child_iterator child_end(); 2245}; 2246 2247//===----------------------------------------------------------------------===// 2248// Clang Extensions 2249//===----------------------------------------------------------------------===// 2250 2251 2252/// ExtVectorElementExpr - This represents access to specific elements of a 2253/// vector, and may occur on the left hand side or right hand side. For example 2254/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2255/// 2256/// Note that the base may have either vector or pointer to vector type, just 2257/// like a struct field reference. 2258/// 2259class ExtVectorElementExpr : public Expr { 2260 Stmt *Base; 2261 IdentifierInfo &Accessor; 2262 SourceLocation AccessorLoc; 2263public: 2264 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2265 SourceLocation loc) 2266 : Expr(ExtVectorElementExprClass, ty), 2267 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2268 2269 const Expr *getBase() const { return cast<Expr>(Base); } 2270 Expr *getBase() { return cast<Expr>(Base); } 2271 2272 IdentifierInfo &getAccessor() const { return Accessor; } 2273 2274 /// getNumElements - Get the number of components being selected. 2275 unsigned getNumElements() const; 2276 2277 /// containsDuplicateElements - Return true if any element access is 2278 /// repeated. 2279 bool containsDuplicateElements() const; 2280 2281 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2282 /// aggregate Constant of ConstantInt(s). 2283 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2284 2285 virtual SourceRange getSourceRange() const { 2286 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2287 } 2288 2289 /// isArrow - Return true if the base expression is a pointer to vector, 2290 /// return false if the base expression is a vector. 2291 bool isArrow() const; 2292 2293 static bool classof(const Stmt *T) { 2294 return T->getStmtClass() == ExtVectorElementExprClass; 2295 } 2296 static bool classof(const ExtVectorElementExpr *) { return true; } 2297 2298 // Iterators 2299 virtual child_iterator child_begin(); 2300 virtual child_iterator child_end(); 2301 2302 virtual void EmitImpl(llvm::Serializer& S) const; 2303 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2304}; 2305 2306 2307/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2308/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2309class BlockExpr : public Expr { 2310protected: 2311 BlockDecl *TheBlock; 2312 bool HasBlockDeclRefExprs; 2313public: 2314 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2315 : Expr(BlockExprClass, ty), 2316 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2317 2318 const BlockDecl *getBlockDecl() const { return TheBlock; } 2319 BlockDecl *getBlockDecl() { return TheBlock; } 2320 2321 // Convenience functions for probing the underlying BlockDecl. 2322 SourceLocation getCaretLocation() const; 2323 const Stmt *getBody() const; 2324 Stmt *getBody(); 2325 2326 virtual SourceRange getSourceRange() const { 2327 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2328 } 2329 2330 /// getFunctionType - Return the underlying function type for this block. 2331 const FunctionType *getFunctionType() const; 2332 2333 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2334 /// contained inside. 2335 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2336 2337 static bool classof(const Stmt *T) { 2338 return T->getStmtClass() == BlockExprClass; 2339 } 2340 static bool classof(const BlockExpr *) { return true; } 2341 2342 // Iterators 2343 virtual child_iterator child_begin(); 2344 virtual child_iterator child_end(); 2345 2346 virtual void EmitImpl(llvm::Serializer& S) const; 2347 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2348}; 2349 2350/// BlockDeclRefExpr - A reference to a declared variable, function, 2351/// enum, etc. 2352class BlockDeclRefExpr : public Expr { 2353 ValueDecl *D; 2354 SourceLocation Loc; 2355 bool IsByRef; 2356public: 2357 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2358 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2359 2360 ValueDecl *getDecl() { return D; } 2361 const ValueDecl *getDecl() const { return D; } 2362 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2363 2364 bool isByRef() const { return IsByRef; } 2365 2366 static bool classof(const Stmt *T) { 2367 return T->getStmtClass() == BlockDeclRefExprClass; 2368 } 2369 static bool classof(const BlockDeclRefExpr *) { return true; } 2370 2371 // Iterators 2372 virtual child_iterator child_begin(); 2373 virtual child_iterator child_end(); 2374 2375 virtual void EmitImpl(llvm::Serializer& S) const; 2376 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2377}; 2378 2379} // end namespace clang 2380 2381#endif 2382