Expr.h revision ba6d7e7fa5f79959d3eef39adb5620d845ba5198
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 /// \brief Build an empty imaginary literal. 530 explicit ImaginaryLiteral(EmptyShell Empty) 531 : Expr(ImaginaryLiteralClass, Empty) { } 532 533 const Expr *getSubExpr() const { return cast<Expr>(Val); } 534 Expr *getSubExpr() { return cast<Expr>(Val); } 535 void setSubExpr(Expr *E) { Val = E; } 536 537 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 538 static bool classof(const Stmt *T) { 539 return T->getStmtClass() == ImaginaryLiteralClass; 540 } 541 static bool classof(const ImaginaryLiteral *) { return true; } 542 543 // Iterators 544 virtual child_iterator child_begin(); 545 virtual child_iterator child_end(); 546 547 virtual void EmitImpl(llvm::Serializer& S) const; 548 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 549}; 550 551/// StringLiteral - This represents a string literal expression, e.g. "foo" 552/// or L"bar" (wide strings). The actual string is returned by getStrData() 553/// is NOT null-terminated, and the length of the string is determined by 554/// calling getByteLength(). The C type for a string is always a 555/// ConstantArrayType. In C++, the char type is const qualified, in C it is 556/// not. 557/// 558/// Note that strings in C can be formed by concatenation of multiple string 559/// literal pptokens in translation phase #6. This keeps track of the locations 560/// of each of these pieces. 561/// 562/// Strings in C can also be truncated and extended by assigning into arrays, 563/// e.g. with constructs like: 564/// char X[2] = "foobar"; 565/// In this case, getByteLength() will return 6, but the string literal will 566/// have type "char[2]". 567class StringLiteral : public Expr { 568 const char *StrData; 569 unsigned ByteLength; 570 bool IsWide; 571 unsigned NumConcatenated; 572 SourceLocation TokLocs[1]; 573 574 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 575public: 576 /// This is the "fully general" constructor that allows representation of 577 /// strings formed from multiple concatenated tokens. 578 static StringLiteral *Create(ASTContext &C, const char *StrData, 579 unsigned ByteLength, bool Wide, QualType Ty, 580 const SourceLocation *Loc, unsigned NumStrs); 581 582 /// Simple constructor for string literals made from one token. 583 static StringLiteral *Create(ASTContext &C, const char *StrData, 584 unsigned ByteLength, 585 bool Wide, QualType Ty, SourceLocation Loc) { 586 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 587 } 588 589 /// \brief Construct an empty string literal. 590 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 591 592 StringLiteral* Clone(ASTContext &C) const; 593 void Destroy(ASTContext &C); 594 595 const char *getStrData() const { return StrData; } 596 unsigned getByteLength() const { return ByteLength; } 597 598 /// \brief Sets the string data to the given string data. 599 void setStrData(ASTContext &C, const char *Str, unsigned Len); 600 601 bool isWide() const { return IsWide; } 602 void setWide(bool W) { IsWide = W; } 603 604 bool containsNonAsciiOrNull() const { 605 for (unsigned i = 0; i < getByteLength(); ++i) 606 if (!isascii(getStrData()[i]) || !getStrData()[i]) 607 return true; 608 return false; 609 } 610 /// getNumConcatenated - Get the number of string literal tokens that were 611 /// concatenated in translation phase #6 to form this string literal. 612 unsigned getNumConcatenated() const { return NumConcatenated; } 613 614 SourceLocation getStrTokenLoc(unsigned TokNum) const { 615 assert(TokNum < NumConcatenated && "Invalid tok number"); 616 return TokLocs[TokNum]; 617 } 618 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 619 assert(TokNum < NumConcatenated && "Invalid tok number"); 620 TokLocs[TokNum] = L; 621 } 622 623 typedef const SourceLocation *tokloc_iterator; 624 tokloc_iterator tokloc_begin() const { return TokLocs; } 625 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 626 627 virtual SourceRange getSourceRange() const { 628 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 629 } 630 static bool classof(const Stmt *T) { 631 return T->getStmtClass() == StringLiteralClass; 632 } 633 static bool classof(const StringLiteral *) { return true; } 634 635 // Iterators 636 virtual child_iterator child_begin(); 637 virtual child_iterator child_end(); 638 639 virtual void EmitImpl(llvm::Serializer& S) const; 640 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 641}; 642 643/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 644/// AST node is only formed if full location information is requested. 645class ParenExpr : public Expr { 646 SourceLocation L, R; 647 Stmt *Val; 648public: 649 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 650 : Expr(ParenExprClass, val->getType(), 651 val->isTypeDependent(), val->isValueDependent()), 652 L(l), R(r), Val(val) {} 653 654 /// \brief Construct an empty parenthesized expression. 655 explicit ParenExpr(EmptyShell Empty) 656 : Expr(ParenExprClass, Empty) { } 657 658 const Expr *getSubExpr() const { return cast<Expr>(Val); } 659 Expr *getSubExpr() { return cast<Expr>(Val); } 660 void setSubExpr(Expr *E) { Val = E; } 661 662 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 663 664 /// \brief Get the location of the left parentheses '('. 665 SourceLocation getLParen() const { return L; } 666 void setLParen(SourceLocation Loc) { L = Loc; } 667 668 /// \brief Get the location of the right parentheses ')'. 669 SourceLocation getRParen() const { return R; } 670 void setRParen(SourceLocation Loc) { R = Loc; } 671 672 static bool classof(const Stmt *T) { 673 return T->getStmtClass() == ParenExprClass; 674 } 675 static bool classof(const ParenExpr *) { return true; } 676 677 // Iterators 678 virtual child_iterator child_begin(); 679 virtual child_iterator child_end(); 680 681 virtual void EmitImpl(llvm::Serializer& S) const; 682 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 683}; 684 685 686/// UnaryOperator - This represents the unary-expression's (except sizeof and 687/// alignof), the postinc/postdec operators from postfix-expression, and various 688/// extensions. 689/// 690/// Notes on various nodes: 691/// 692/// Real/Imag - These return the real/imag part of a complex operand. If 693/// applied to a non-complex value, the former returns its operand and the 694/// later returns zero in the type of the operand. 695/// 696/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 697/// subexpression is a compound literal with the various MemberExpr and 698/// ArraySubscriptExpr's applied to it. 699/// 700class UnaryOperator : public Expr { 701public: 702 // Note that additions to this should also update the StmtVisitor class. 703 enum Opcode { 704 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 705 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 706 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 707 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 708 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 709 Real, Imag, // "__real expr"/"__imag expr" Extension. 710 Extension, // __extension__ marker. 711 OffsetOf // __builtin_offsetof 712 }; 713private: 714 Stmt *Val; 715 Opcode Opc; 716 SourceLocation Loc; 717public: 718 719 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 720 : Expr(UnaryOperatorClass, type, 721 input->isTypeDependent() && opc != OffsetOf, 722 input->isValueDependent()), 723 Val(input), Opc(opc), Loc(l) {} 724 725 /// \brief Build an empty unary operator. 726 explicit UnaryOperator(EmptyShell Empty) 727 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 728 729 Opcode getOpcode() const { return Opc; } 730 void setOpcode(Opcode O) { Opc = O; } 731 732 Expr *getSubExpr() const { return cast<Expr>(Val); } 733 void setSubExpr(Expr *E) { Val = E; } 734 735 /// getOperatorLoc - Return the location of the operator. 736 SourceLocation getOperatorLoc() const { return Loc; } 737 void setOperatorLoc(SourceLocation L) { Loc = L; } 738 739 /// isPostfix - Return true if this is a postfix operation, like x++. 740 static bool isPostfix(Opcode Op) { 741 return Op == PostInc || Op == PostDec; 742 } 743 744 /// isPostfix - Return true if this is a prefix operation, like --x. 745 static bool isPrefix(Opcode Op) { 746 return Op == PreInc || Op == PreDec; 747 } 748 749 bool isPrefix() const { return isPrefix(Opc); } 750 bool isPostfix() const { return isPostfix(Opc); } 751 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 752 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 753 bool isOffsetOfOp() const { return Opc == OffsetOf; } 754 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 755 756 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 757 /// corresponds to, e.g. "sizeof" or "[pre]++" 758 static const char *getOpcodeStr(Opcode Op); 759 760 /// \brief Retrieve the unary opcode that corresponds to the given 761 /// overloaded operator. 762 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 763 764 /// \brief Retrieve the overloaded operator kind that corresponds to 765 /// the given unary opcode. 766 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 767 768 virtual SourceRange getSourceRange() const { 769 if (isPostfix()) 770 return SourceRange(Val->getLocStart(), Loc); 771 else 772 return SourceRange(Loc, Val->getLocEnd()); 773 } 774 virtual SourceLocation getExprLoc() const { return Loc; } 775 776 static bool classof(const Stmt *T) { 777 return T->getStmtClass() == UnaryOperatorClass; 778 } 779 static bool classof(const UnaryOperator *) { return true; } 780 781 // Iterators 782 virtual child_iterator child_begin(); 783 virtual child_iterator child_end(); 784 785 virtual void EmitImpl(llvm::Serializer& S) const; 786 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 787}; 788 789/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 790/// types and expressions. 791class SizeOfAlignOfExpr : public Expr { 792 bool isSizeof : 1; // true if sizeof, false if alignof. 793 bool isType : 1; // true if operand is a type, false if an expression 794 union { 795 void *Ty; 796 Stmt *Ex; 797 } Argument; 798 SourceLocation OpLoc, RParenLoc; 799public: 800 SizeOfAlignOfExpr(bool issizeof, QualType T, 801 QualType resultType, SourceLocation op, 802 SourceLocation rp) : 803 Expr(SizeOfAlignOfExprClass, resultType, 804 false, // Never type-dependent (C++ [temp.dep.expr]p3). 805 // Value-dependent if the argument is type-dependent. 806 T->isDependentType()), 807 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 808 Argument.Ty = T.getAsOpaquePtr(); 809 } 810 811 SizeOfAlignOfExpr(bool issizeof, Expr *E, 812 QualType resultType, SourceLocation op, 813 SourceLocation rp) : 814 Expr(SizeOfAlignOfExprClass, resultType, 815 false, // Never type-dependent (C++ [temp.dep.expr]p3). 816 // Value-dependent if the argument is type-dependent. 817 E->isTypeDependent()), 818 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 819 Argument.Ex = E; 820 } 821 822 /// \brief Construct an empty sizeof/alignof expression. 823 explicit SizeOfAlignOfExpr(EmptyShell Empty) 824 : Expr(SizeOfAlignOfExprClass, Empty) { } 825 826 virtual void Destroy(ASTContext& C); 827 828 bool isSizeOf() const { return isSizeof; } 829 void setSizeof(bool S) { isSizeof = S; } 830 831 bool isArgumentType() const { return isType; } 832 QualType getArgumentType() const { 833 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 834 return QualType::getFromOpaquePtr(Argument.Ty); 835 } 836 Expr *getArgumentExpr() { 837 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 838 return static_cast<Expr*>(Argument.Ex); 839 } 840 const Expr *getArgumentExpr() const { 841 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 842 } 843 844 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 845 void setArgument(QualType T) { 846 Argument.Ty = T.getAsOpaquePtr(); 847 isType = true; 848 } 849 850 /// Gets the argument type, or the type of the argument expression, whichever 851 /// is appropriate. 852 QualType getTypeOfArgument() const { 853 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 854 } 855 856 SourceLocation getOperatorLoc() const { return OpLoc; } 857 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 858 859 SourceLocation getRParenLoc() const { return RParenLoc; } 860 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 861 862 virtual SourceRange getSourceRange() const { 863 return SourceRange(OpLoc, RParenLoc); 864 } 865 866 static bool classof(const Stmt *T) { 867 return T->getStmtClass() == SizeOfAlignOfExprClass; 868 } 869 static bool classof(const SizeOfAlignOfExpr *) { return true; } 870 871 // Iterators 872 virtual child_iterator child_begin(); 873 virtual child_iterator child_end(); 874 875 virtual void EmitImpl(llvm::Serializer& S) const; 876 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 877}; 878 879//===----------------------------------------------------------------------===// 880// Postfix Operators. 881//===----------------------------------------------------------------------===// 882 883/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 884class ArraySubscriptExpr : public Expr { 885 enum { LHS, RHS, END_EXPR=2 }; 886 Stmt* SubExprs[END_EXPR]; 887 SourceLocation RBracketLoc; 888public: 889 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 890 SourceLocation rbracketloc) 891 : Expr(ArraySubscriptExprClass, t, 892 lhs->isTypeDependent() || rhs->isTypeDependent(), 893 lhs->isValueDependent() || rhs->isValueDependent()), 894 RBracketLoc(rbracketloc) { 895 SubExprs[LHS] = lhs; 896 SubExprs[RHS] = rhs; 897 } 898 899 /// \brief Create an empty array subscript expression. 900 explicit ArraySubscriptExpr(EmptyShell Shell) 901 : Expr(ArraySubscriptExprClass, Shell) { } 902 903 /// An array access can be written A[4] or 4[A] (both are equivalent). 904 /// - getBase() and getIdx() always present the normalized view: A[4]. 905 /// In this case getBase() returns "A" and getIdx() returns "4". 906 /// - getLHS() and getRHS() present the syntactic view. e.g. for 907 /// 4[A] getLHS() returns "4". 908 /// Note: Because vector element access is also written A[4] we must 909 /// predicate the format conversion in getBase and getIdx only on the 910 /// the type of the RHS, as it is possible for the LHS to be a vector of 911 /// integer type 912 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 913 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 914 void setLHS(Expr *E) { SubExprs[LHS] = E; } 915 916 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 917 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 918 void setRHS(Expr *E) { SubExprs[RHS] = E; } 919 920 Expr *getBase() { 921 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 922 } 923 924 const Expr *getBase() const { 925 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 926 } 927 928 Expr *getIdx() { 929 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 930 } 931 932 const Expr *getIdx() const { 933 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 934 } 935 936 virtual SourceRange getSourceRange() const { 937 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 938 } 939 940 SourceLocation getRBracketLoc() const { return RBracketLoc; } 941 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 942 943 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 944 945 static bool classof(const Stmt *T) { 946 return T->getStmtClass() == ArraySubscriptExprClass; 947 } 948 static bool classof(const ArraySubscriptExpr *) { return true; } 949 950 // Iterators 951 virtual child_iterator child_begin(); 952 virtual child_iterator child_end(); 953 954 virtual void EmitImpl(llvm::Serializer& S) const; 955 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 956}; 957 958 959/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 960/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 961/// while its subclasses may represent alternative syntax that (semantically) 962/// results in a function call. For example, CXXOperatorCallExpr is 963/// a subclass for overloaded operator calls that use operator syntax, e.g., 964/// "str1 + str2" to resolve to a function call. 965class CallExpr : public Expr { 966 enum { FN=0, ARGS_START=1 }; 967 Stmt **SubExprs; 968 unsigned NumArgs; 969 SourceLocation RParenLoc; 970 971 // This version of the ctor is for deserialization. 972 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 973 SourceLocation rparenloc) 974 : Expr(SC,t), SubExprs(subexprs), 975 NumArgs(numargs), RParenLoc(rparenloc) {} 976 977protected: 978 // This version of the constructor is for derived classes. 979 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 980 QualType t, SourceLocation rparenloc); 981 982public: 983 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 984 SourceLocation rparenloc); 985 986 /// \brief Build an empty call expression. 987 CallExpr(ASTContext &C, EmptyShell Empty); 988 989 ~CallExpr() {} 990 991 void Destroy(ASTContext& C); 992 993 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 994 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 995 void setCallee(Expr *F) { SubExprs[FN] = F; } 996 997 /// getNumArgs - Return the number of actual arguments to this call. 998 /// 999 unsigned getNumArgs() const { return NumArgs; } 1000 1001 /// getArg - Return the specified argument. 1002 Expr *getArg(unsigned Arg) { 1003 assert(Arg < NumArgs && "Arg access out of range!"); 1004 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1005 } 1006 const Expr *getArg(unsigned Arg) const { 1007 assert(Arg < NumArgs && "Arg access out of range!"); 1008 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1009 } 1010 1011 /// setArg - Set the specified argument. 1012 void setArg(unsigned Arg, Expr *ArgExpr) { 1013 assert(Arg < NumArgs && "Arg access out of range!"); 1014 SubExprs[Arg+ARGS_START] = ArgExpr; 1015 } 1016 1017 /// setNumArgs - This changes the number of arguments present in this call. 1018 /// Any orphaned expressions are deleted by this, and any new operands are set 1019 /// to null. 1020 void setNumArgs(ASTContext& C, unsigned NumArgs); 1021 1022 typedef ExprIterator arg_iterator; 1023 typedef ConstExprIterator const_arg_iterator; 1024 1025 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1026 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1027 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1028 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1029 1030 /// getNumCommas - Return the number of commas that must have been present in 1031 /// this function call. 1032 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1033 1034 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1035 /// not, return 0. 1036 unsigned isBuiltinCall(ASTContext &Context) const; 1037 1038 SourceLocation getRParenLoc() const { return RParenLoc; } 1039 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1040 1041 virtual SourceRange getSourceRange() const { 1042 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1043 } 1044 1045 static bool classof(const Stmt *T) { 1046 return T->getStmtClass() == CallExprClass || 1047 T->getStmtClass() == CXXOperatorCallExprClass || 1048 T->getStmtClass() == CXXMemberCallExprClass; 1049 } 1050 static bool classof(const CallExpr *) { return true; } 1051 static bool classof(const CXXOperatorCallExpr *) { return true; } 1052 static bool classof(const CXXMemberCallExpr *) { return true; } 1053 1054 // Iterators 1055 virtual child_iterator child_begin(); 1056 virtual child_iterator child_end(); 1057 1058 virtual void EmitImpl(llvm::Serializer& S) const; 1059 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 1060 StmtClass SC); 1061}; 1062 1063/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1064/// 1065class MemberExpr : public Expr { 1066 /// Base - the expression for the base pointer or structure references. In 1067 /// X.F, this is "X". 1068 Stmt *Base; 1069 1070 /// MemberDecl - This is the decl being referenced by the field/member name. 1071 /// In X.F, this is the decl referenced by F. 1072 NamedDecl *MemberDecl; 1073 1074 /// MemberLoc - This is the location of the member name. 1075 SourceLocation MemberLoc; 1076 1077 /// IsArrow - True if this is "X->F", false if this is "X.F". 1078 bool IsArrow; 1079public: 1080 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1081 QualType ty) 1082 : Expr(MemberExprClass, ty), 1083 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1084 1085 /// \brief Build an empty member reference expression. 1086 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1087 1088 void setBase(Expr *E) { Base = E; } 1089 Expr *getBase() const { return cast<Expr>(Base); } 1090 1091 /// \brief Retrieve the member declaration to which this expression refers. 1092 /// 1093 /// The returned declaration will either be a FieldDecl or (in C++) 1094 /// a CXXMethodDecl. 1095 NamedDecl *getMemberDecl() const { return MemberDecl; } 1096 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1097 1098 bool isArrow() const { return IsArrow; } 1099 void setArrow(bool A) { IsArrow = A; } 1100 1101 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1102 /// location of 'F'. 1103 SourceLocation getMemberLoc() const { return MemberLoc; } 1104 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1105 1106 virtual SourceRange getSourceRange() const { 1107 return SourceRange(getBase()->getLocStart(), MemberLoc); 1108 } 1109 1110 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1111 1112 static bool classof(const Stmt *T) { 1113 return T->getStmtClass() == MemberExprClass; 1114 } 1115 static bool classof(const MemberExpr *) { return true; } 1116 1117 // Iterators 1118 virtual child_iterator child_begin(); 1119 virtual child_iterator child_end(); 1120 1121 virtual void EmitImpl(llvm::Serializer& S) const; 1122 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1123}; 1124 1125/// CompoundLiteralExpr - [C99 6.5.2.5] 1126/// 1127class CompoundLiteralExpr : public Expr { 1128 /// LParenLoc - If non-null, this is the location of the left paren in a 1129 /// compound literal like "(int){4}". This can be null if this is a 1130 /// synthesized compound expression. 1131 SourceLocation LParenLoc; 1132 Stmt *Init; 1133 bool FileScope; 1134public: 1135 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1136 bool fileScope) 1137 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1138 FileScope(fileScope) {} 1139 1140 /// \brief Construct an empty compound literal. 1141 explicit CompoundLiteralExpr(EmptyShell Empty) 1142 : Expr(CompoundLiteralExprClass, Empty) { } 1143 1144 const Expr *getInitializer() const { return cast<Expr>(Init); } 1145 Expr *getInitializer() { return cast<Expr>(Init); } 1146 void setInitializer(Expr *E) { Init = E; } 1147 1148 bool isFileScope() const { return FileScope; } 1149 void setFileScope(bool FS) { FileScope = FS; } 1150 1151 SourceLocation getLParenLoc() const { return LParenLoc; } 1152 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1153 1154 virtual SourceRange getSourceRange() const { 1155 // FIXME: Init should never be null. 1156 if (!Init) 1157 return SourceRange(); 1158 if (LParenLoc.isInvalid()) 1159 return Init->getSourceRange(); 1160 return SourceRange(LParenLoc, Init->getLocEnd()); 1161 } 1162 1163 static bool classof(const Stmt *T) { 1164 return T->getStmtClass() == CompoundLiteralExprClass; 1165 } 1166 static bool classof(const CompoundLiteralExpr *) { return true; } 1167 1168 // Iterators 1169 virtual child_iterator child_begin(); 1170 virtual child_iterator child_end(); 1171 1172 virtual void EmitImpl(llvm::Serializer& S) const; 1173 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1174}; 1175 1176/// CastExpr - Base class for type casts, including both implicit 1177/// casts (ImplicitCastExpr) and explicit casts that have some 1178/// representation in the source code (ExplicitCastExpr's derived 1179/// classes). 1180class CastExpr : public Expr { 1181 Stmt *Op; 1182protected: 1183 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1184 Expr(SC, ty, 1185 // Cast expressions are type-dependent if the type is 1186 // dependent (C++ [temp.dep.expr]p3). 1187 ty->isDependentType(), 1188 // Cast expressions are value-dependent if the type is 1189 // dependent or if the subexpression is value-dependent. 1190 ty->isDependentType() || (op && op->isValueDependent())), 1191 Op(op) {} 1192 1193 /// \brief Construct an empty cast. 1194 CastExpr(StmtClass SC, EmptyShell Empty) 1195 : Expr(SC, Empty) { } 1196 1197public: 1198 Expr *getSubExpr() { return cast<Expr>(Op); } 1199 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1200 void setSubExpr(Expr *E) { Op = E; } 1201 1202 static bool classof(const Stmt *T) { 1203 StmtClass SC = T->getStmtClass(); 1204 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1205 return true; 1206 1207 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1208 return true; 1209 1210 return false; 1211 } 1212 static bool classof(const CastExpr *) { return true; } 1213 1214 // Iterators 1215 virtual child_iterator child_begin(); 1216 virtual child_iterator child_end(); 1217}; 1218 1219/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1220/// conversions, which have no direct representation in the original 1221/// source code. For example: converting T[]->T*, void f()->void 1222/// (*f)(), float->double, short->int, etc. 1223/// 1224/// In C, implicit casts always produce rvalues. However, in C++, an 1225/// implicit cast whose result is being bound to a reference will be 1226/// an lvalue. For example: 1227/// 1228/// @code 1229/// class Base { }; 1230/// class Derived : public Base { }; 1231/// void f(Derived d) { 1232/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1233/// } 1234/// @endcode 1235class ImplicitCastExpr : public CastExpr { 1236 /// LvalueCast - Whether this cast produces an lvalue. 1237 bool LvalueCast; 1238 1239public: 1240 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1241 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1242 1243 /// \brief Construct an empty implicit cast. 1244 explicit ImplicitCastExpr(EmptyShell Shell) 1245 : CastExpr(ImplicitCastExprClass, Shell) { } 1246 1247 1248 virtual SourceRange getSourceRange() const { 1249 return getSubExpr()->getSourceRange(); 1250 } 1251 1252 /// isLvalueCast - Whether this cast produces an lvalue. 1253 bool isLvalueCast() const { return LvalueCast; } 1254 1255 /// setLvalueCast - Set whether this cast produces an lvalue. 1256 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1257 1258 static bool classof(const Stmt *T) { 1259 return T->getStmtClass() == ImplicitCastExprClass; 1260 } 1261 static bool classof(const ImplicitCastExpr *) { return true; } 1262 1263 virtual void EmitImpl(llvm::Serializer& S) const; 1264 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1265}; 1266 1267/// ExplicitCastExpr - An explicit cast written in the source 1268/// code. 1269/// 1270/// This class is effectively an abstract class, because it provides 1271/// the basic representation of an explicitly-written cast without 1272/// specifying which kind of cast (C cast, functional cast, static 1273/// cast, etc.) was written; specific derived classes represent the 1274/// particular style of cast and its location information. 1275/// 1276/// Unlike implicit casts, explicit cast nodes have two different 1277/// types: the type that was written into the source code, and the 1278/// actual type of the expression as determined by semantic 1279/// analysis. These types may differ slightly. For example, in C++ one 1280/// can cast to a reference type, which indicates that the resulting 1281/// expression will be an lvalue. The reference type, however, will 1282/// not be used as the type of the expression. 1283class ExplicitCastExpr : public CastExpr { 1284 /// TypeAsWritten - The type that this expression is casting to, as 1285 /// written in the source code. 1286 QualType TypeAsWritten; 1287 1288protected: 1289 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1290 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1291 1292 /// \brief Construct an empty explicit cast. 1293 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1294 : CastExpr(SC, Shell) { } 1295 1296public: 1297 /// getTypeAsWritten - Returns the type that this expression is 1298 /// casting to, as written in the source code. 1299 QualType getTypeAsWritten() const { return TypeAsWritten; } 1300 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1301 1302 static bool classof(const Stmt *T) { 1303 StmtClass SC = T->getStmtClass(); 1304 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1305 return true; 1306 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1307 return true; 1308 1309 return false; 1310 } 1311 static bool classof(const ExplicitCastExpr *) { return true; } 1312}; 1313 1314/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1315/// cast in C++ (C++ [expr.cast]), which uses the syntax 1316/// (Type)expr. For example: @c (int)f. 1317class CStyleCastExpr : public ExplicitCastExpr { 1318 SourceLocation LPLoc; // the location of the left paren 1319 SourceLocation RPLoc; // the location of the right paren 1320public: 1321 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1322 SourceLocation l, SourceLocation r) : 1323 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1324 LPLoc(l), RPLoc(r) {} 1325 1326 /// \brief Construct an empty C-style explicit cast. 1327 explicit CStyleCastExpr(EmptyShell Shell) 1328 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1329 1330 SourceLocation getLParenLoc() const { return LPLoc; } 1331 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1332 1333 SourceLocation getRParenLoc() const { return RPLoc; } 1334 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1335 1336 virtual SourceRange getSourceRange() const { 1337 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1338 } 1339 static bool classof(const Stmt *T) { 1340 return T->getStmtClass() == CStyleCastExprClass; 1341 } 1342 static bool classof(const CStyleCastExpr *) { return true; } 1343 1344 virtual void EmitImpl(llvm::Serializer& S) const; 1345 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1346}; 1347 1348/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1349/// 1350/// This expression node kind describes a builtin binary operation, 1351/// such as "x + y" for integer values "x" and "y". The operands will 1352/// already have been converted to appropriate types (e.g., by 1353/// performing promotions or conversions). 1354/// 1355/// In C++, where operators may be overloaded, a different kind of 1356/// expression node (CXXOperatorCallExpr) is used to express the 1357/// invocation of an overloaded operator with operator syntax. Within 1358/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1359/// used to store an expression "x + y" depends on the subexpressions 1360/// for x and y. If neither x or y is type-dependent, and the "+" 1361/// operator resolves to a built-in operation, BinaryOperator will be 1362/// used to express the computation (x and y may still be 1363/// value-dependent). If either x or y is type-dependent, or if the 1364/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1365/// be used to express the computation. 1366class BinaryOperator : public Expr { 1367public: 1368 enum Opcode { 1369 // Operators listed in order of precedence. 1370 // Note that additions to this should also update the StmtVisitor class. 1371 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1372 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1373 Add, Sub, // [C99 6.5.6] Additive operators. 1374 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1375 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1376 EQ, NE, // [C99 6.5.9] Equality operators. 1377 And, // [C99 6.5.10] Bitwise AND operator. 1378 Xor, // [C99 6.5.11] Bitwise XOR operator. 1379 Or, // [C99 6.5.12] Bitwise OR operator. 1380 LAnd, // [C99 6.5.13] Logical AND operator. 1381 LOr, // [C99 6.5.14] Logical OR operator. 1382 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1383 DivAssign, RemAssign, 1384 AddAssign, SubAssign, 1385 ShlAssign, ShrAssign, 1386 AndAssign, XorAssign, 1387 OrAssign, 1388 Comma // [C99 6.5.17] Comma operator. 1389 }; 1390private: 1391 enum { LHS, RHS, END_EXPR }; 1392 Stmt* SubExprs[END_EXPR]; 1393 Opcode Opc; 1394 SourceLocation OpLoc; 1395public: 1396 1397 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1398 SourceLocation opLoc) 1399 : Expr(BinaryOperatorClass, ResTy, 1400 lhs->isTypeDependent() || rhs->isTypeDependent(), 1401 lhs->isValueDependent() || rhs->isValueDependent()), 1402 Opc(opc), OpLoc(opLoc) { 1403 SubExprs[LHS] = lhs; 1404 SubExprs[RHS] = rhs; 1405 assert(!isCompoundAssignmentOp() && 1406 "Use ArithAssignBinaryOperator for compound assignments"); 1407 } 1408 1409 /// \brief Construct an empty binary operator. 1410 explicit BinaryOperator(EmptyShell Empty) 1411 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1412 1413 SourceLocation getOperatorLoc() const { return OpLoc; } 1414 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1415 1416 Opcode getOpcode() const { return Opc; } 1417 void setOpcode(Opcode O) { Opc = O; } 1418 1419 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1420 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1421 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1422 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1423 1424 virtual SourceRange getSourceRange() const { 1425 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1426 } 1427 1428 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1429 /// corresponds to, e.g. "<<=". 1430 static const char *getOpcodeStr(Opcode Op); 1431 1432 /// \brief Retrieve the binary opcode that corresponds to the given 1433 /// overloaded operator. 1434 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1435 1436 /// \brief Retrieve the overloaded operator kind that corresponds to 1437 /// the given binary opcode. 1438 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1439 1440 /// predicates to categorize the respective opcodes. 1441 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1442 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1443 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1444 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1445 1446 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1447 bool isRelationalOp() const { return isRelationalOp(Opc); } 1448 1449 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1450 bool isEqualityOp() const { return isEqualityOp(Opc); } 1451 1452 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1453 bool isLogicalOp() const { return isLogicalOp(Opc); } 1454 1455 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1456 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1457 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1458 1459 static bool classof(const Stmt *S) { 1460 return S->getStmtClass() == BinaryOperatorClass || 1461 S->getStmtClass() == CompoundAssignOperatorClass; 1462 } 1463 static bool classof(const BinaryOperator *) { return true; } 1464 1465 // Iterators 1466 virtual child_iterator child_begin(); 1467 virtual child_iterator child_end(); 1468 1469 virtual void EmitImpl(llvm::Serializer& S) const; 1470 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1471 1472protected: 1473 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1474 SourceLocation oploc, bool dead) 1475 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1476 SubExprs[LHS] = lhs; 1477 SubExprs[RHS] = rhs; 1478 } 1479 1480 BinaryOperator(StmtClass SC, EmptyShell Empty) 1481 : Expr(SC, Empty), Opc(MulAssign) { } 1482}; 1483 1484/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1485/// track of the type the operation is performed in. Due to the semantics of 1486/// these operators, the operands are promoted, the aritmetic performed, an 1487/// implicit conversion back to the result type done, then the assignment takes 1488/// place. This captures the intermediate type which the computation is done 1489/// in. 1490class CompoundAssignOperator : public BinaryOperator { 1491 QualType ComputationLHSType; 1492 QualType ComputationResultType; 1493public: 1494 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1495 QualType ResType, QualType CompLHSType, 1496 QualType CompResultType, 1497 SourceLocation OpLoc) 1498 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1499 ComputationLHSType(CompLHSType), 1500 ComputationResultType(CompResultType) { 1501 assert(isCompoundAssignmentOp() && 1502 "Only should be used for compound assignments"); 1503 } 1504 1505 /// \brief Build an empty compound assignment operator expression. 1506 explicit CompoundAssignOperator(EmptyShell Empty) 1507 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1508 1509 // The two computation types are the type the LHS is converted 1510 // to for the computation and the type of the result; the two are 1511 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1512 QualType getComputationLHSType() const { return ComputationLHSType; } 1513 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1514 1515 QualType getComputationResultType() const { return ComputationResultType; } 1516 void setComputationResultType(QualType T) { ComputationResultType = T; } 1517 1518 static bool classof(const CompoundAssignOperator *) { return true; } 1519 static bool classof(const Stmt *S) { 1520 return S->getStmtClass() == CompoundAssignOperatorClass; 1521 } 1522 1523 virtual void EmitImpl(llvm::Serializer& S) const; 1524 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1525 ASTContext& C); 1526}; 1527 1528/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1529/// GNU "missing LHS" extension is in use. 1530/// 1531class ConditionalOperator : public Expr { 1532 enum { COND, LHS, RHS, END_EXPR }; 1533 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1534public: 1535 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1536 : Expr(ConditionalOperatorClass, t, 1537 // FIXME: the type of the conditional operator doesn't 1538 // depend on the type of the conditional, but the standard 1539 // seems to imply that it could. File a bug! 1540 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1541 (cond->isValueDependent() || 1542 (lhs && lhs->isValueDependent()) || 1543 (rhs && rhs->isValueDependent()))) { 1544 SubExprs[COND] = cond; 1545 SubExprs[LHS] = lhs; 1546 SubExprs[RHS] = rhs; 1547 } 1548 1549 /// \brief Build an empty conditional operator. 1550 explicit ConditionalOperator(EmptyShell Empty) 1551 : Expr(ConditionalOperatorClass, Empty) { } 1552 1553 // getCond - Return the expression representing the condition for 1554 // the ?: operator. 1555 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1556 void setCond(Expr *E) { SubExprs[COND] = E; } 1557 1558 // getTrueExpr - Return the subexpression representing the value of the ?: 1559 // expression if the condition evaluates to true. In most cases this value 1560 // will be the same as getLHS() except a GCC extension allows the left 1561 // subexpression to be omitted, and instead of the condition be returned. 1562 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1563 // is only evaluated once. 1564 Expr *getTrueExpr() const { 1565 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1566 } 1567 1568 // getTrueExpr - Return the subexpression representing the value of the ?: 1569 // expression if the condition evaluates to false. This is the same as getRHS. 1570 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1571 1572 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1573 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1574 1575 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1576 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1577 1578 virtual SourceRange getSourceRange() const { 1579 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1580 } 1581 static bool classof(const Stmt *T) { 1582 return T->getStmtClass() == ConditionalOperatorClass; 1583 } 1584 static bool classof(const ConditionalOperator *) { return true; } 1585 1586 // Iterators 1587 virtual child_iterator child_begin(); 1588 virtual child_iterator child_end(); 1589 1590 virtual void EmitImpl(llvm::Serializer& S) const; 1591 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1592}; 1593 1594/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1595class AddrLabelExpr : public Expr { 1596 SourceLocation AmpAmpLoc, LabelLoc; 1597 LabelStmt *Label; 1598public: 1599 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1600 QualType t) 1601 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1602 1603 virtual SourceRange getSourceRange() const { 1604 return SourceRange(AmpAmpLoc, LabelLoc); 1605 } 1606 1607 LabelStmt *getLabel() const { return Label; } 1608 1609 static bool classof(const Stmt *T) { 1610 return T->getStmtClass() == AddrLabelExprClass; 1611 } 1612 static bool classof(const AddrLabelExpr *) { return true; } 1613 1614 // Iterators 1615 virtual child_iterator child_begin(); 1616 virtual child_iterator child_end(); 1617 1618 virtual void EmitImpl(llvm::Serializer& S) const; 1619 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1620}; 1621 1622/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1623/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1624/// takes the value of the last subexpression. 1625class StmtExpr : public Expr { 1626 Stmt *SubStmt; 1627 SourceLocation LParenLoc, RParenLoc; 1628public: 1629 StmtExpr(CompoundStmt *substmt, QualType T, 1630 SourceLocation lp, SourceLocation rp) : 1631 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1632 1633 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1634 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1635 1636 virtual SourceRange getSourceRange() const { 1637 return SourceRange(LParenLoc, RParenLoc); 1638 } 1639 1640 SourceLocation getLParenLoc() const { return LParenLoc; } 1641 SourceLocation getRParenLoc() const { return RParenLoc; } 1642 1643 static bool classof(const Stmt *T) { 1644 return T->getStmtClass() == StmtExprClass; 1645 } 1646 static bool classof(const StmtExpr *) { return true; } 1647 1648 // Iterators 1649 virtual child_iterator child_begin(); 1650 virtual child_iterator child_end(); 1651 1652 virtual void EmitImpl(llvm::Serializer& S) const; 1653 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1654}; 1655 1656/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1657/// This AST node represents a function that returns 1 if two *types* (not 1658/// expressions) are compatible. The result of this built-in function can be 1659/// used in integer constant expressions. 1660class TypesCompatibleExpr : public Expr { 1661 QualType Type1; 1662 QualType Type2; 1663 SourceLocation BuiltinLoc, RParenLoc; 1664public: 1665 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1666 QualType t1, QualType t2, SourceLocation RP) : 1667 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1668 BuiltinLoc(BLoc), RParenLoc(RP) {} 1669 1670 /// \brief Build an empty __builtin_type_compatible_p expression. 1671 explicit TypesCompatibleExpr(EmptyShell Empty) 1672 : Expr(TypesCompatibleExprClass, Empty) { } 1673 1674 QualType getArgType1() const { return Type1; } 1675 void setArgType1(QualType T) { Type1 = T; } 1676 QualType getArgType2() const { return Type2; } 1677 void setArgType2(QualType T) { Type2 = T; } 1678 1679 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1680 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1681 1682 SourceLocation getRParenLoc() const { return RParenLoc; } 1683 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1684 1685 virtual SourceRange getSourceRange() const { 1686 return SourceRange(BuiltinLoc, RParenLoc); 1687 } 1688 static bool classof(const Stmt *T) { 1689 return T->getStmtClass() == TypesCompatibleExprClass; 1690 } 1691 static bool classof(const TypesCompatibleExpr *) { return true; } 1692 1693 // Iterators 1694 virtual child_iterator child_begin(); 1695 virtual child_iterator child_end(); 1696 1697 virtual void EmitImpl(llvm::Serializer& S) const; 1698 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1699}; 1700 1701/// ShuffleVectorExpr - clang-specific builtin-in function 1702/// __builtin_shufflevector. 1703/// This AST node represents a operator that does a constant 1704/// shuffle, similar to LLVM's shufflevector instruction. It takes 1705/// two vectors and a variable number of constant indices, 1706/// and returns the appropriately shuffled vector. 1707class ShuffleVectorExpr : public Expr { 1708 SourceLocation BuiltinLoc, RParenLoc; 1709 1710 // SubExprs - the list of values passed to the __builtin_shufflevector 1711 // function. The first two are vectors, and the rest are constant 1712 // indices. The number of values in this list is always 1713 // 2+the number of indices in the vector type. 1714 Stmt **SubExprs; 1715 unsigned NumExprs; 1716 1717public: 1718 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1719 QualType Type, SourceLocation BLoc, 1720 SourceLocation RP) : 1721 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1722 RParenLoc(RP), NumExprs(nexpr) { 1723 1724 SubExprs = new Stmt*[nexpr]; 1725 for (unsigned i = 0; i < nexpr; i++) 1726 SubExprs[i] = args[i]; 1727 } 1728 1729 /// \brief Build an empty vector-shuffle expression. 1730 explicit ShuffleVectorExpr(EmptyShell Empty) 1731 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1732 1733 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1734 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1735 1736 SourceLocation getRParenLoc() const { return RParenLoc; } 1737 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1738 1739 virtual SourceRange getSourceRange() const { 1740 return SourceRange(BuiltinLoc, RParenLoc); 1741 } 1742 static bool classof(const Stmt *T) { 1743 return T->getStmtClass() == ShuffleVectorExprClass; 1744 } 1745 static bool classof(const ShuffleVectorExpr *) { return true; } 1746 1747 ~ShuffleVectorExpr() { 1748 delete [] SubExprs; 1749 } 1750 1751 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1752 /// constant expression, the actual arguments passed in, and the function 1753 /// pointers. 1754 unsigned getNumSubExprs() const { return NumExprs; } 1755 1756 /// getExpr - Return the Expr at the specified index. 1757 Expr *getExpr(unsigned Index) { 1758 assert((Index < NumExprs) && "Arg access out of range!"); 1759 return cast<Expr>(SubExprs[Index]); 1760 } 1761 const Expr *getExpr(unsigned Index) const { 1762 assert((Index < NumExprs) && "Arg access out of range!"); 1763 return cast<Expr>(SubExprs[Index]); 1764 } 1765 1766 void setExprs(Expr ** Exprs, unsigned NumExprs); 1767 1768 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1769 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1770 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1771 } 1772 1773 // Iterators 1774 virtual child_iterator child_begin(); 1775 virtual child_iterator child_end(); 1776 1777 virtual void EmitImpl(llvm::Serializer& S) const; 1778 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1779}; 1780 1781/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1782/// This AST node is similar to the conditional operator (?:) in C, with 1783/// the following exceptions: 1784/// - the test expression must be a integer constant expression. 1785/// - the expression returned acts like the chosen subexpression in every 1786/// visible way: the type is the same as that of the chosen subexpression, 1787/// and all predicates (whether it's an l-value, whether it's an integer 1788/// constant expression, etc.) return the same result as for the chosen 1789/// sub-expression. 1790class ChooseExpr : public Expr { 1791 enum { COND, LHS, RHS, END_EXPR }; 1792 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1793 SourceLocation BuiltinLoc, RParenLoc; 1794public: 1795 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1796 SourceLocation RP) 1797 : Expr(ChooseExprClass, t), 1798 BuiltinLoc(BLoc), RParenLoc(RP) { 1799 SubExprs[COND] = cond; 1800 SubExprs[LHS] = lhs; 1801 SubExprs[RHS] = rhs; 1802 } 1803 1804 /// \brief Build an empty __builtin_choose_expr. 1805 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1806 1807 /// isConditionTrue - Return whether the condition is true (i.e. not 1808 /// equal to zero). 1809 bool isConditionTrue(ASTContext &C) const; 1810 1811 /// getChosenSubExpr - Return the subexpression chosen according to the 1812 /// condition. 1813 Expr *getChosenSubExpr(ASTContext &C) const { 1814 return isConditionTrue(C) ? getLHS() : getRHS(); 1815 } 1816 1817 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1818 void setCond(Expr *E) { SubExprs[COND] = E; } 1819 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1820 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1821 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1822 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1823 1824 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1825 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1826 1827 SourceLocation getRParenLoc() const { return RParenLoc; } 1828 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1829 1830 virtual SourceRange getSourceRange() const { 1831 return SourceRange(BuiltinLoc, RParenLoc); 1832 } 1833 static bool classof(const Stmt *T) { 1834 return T->getStmtClass() == ChooseExprClass; 1835 } 1836 static bool classof(const ChooseExpr *) { return true; } 1837 1838 // Iterators 1839 virtual child_iterator child_begin(); 1840 virtual child_iterator child_end(); 1841 1842 virtual void EmitImpl(llvm::Serializer& S) const; 1843 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1844}; 1845 1846/// GNUNullExpr - Implements the GNU __null extension, which is a name 1847/// for a null pointer constant that has integral type (e.g., int or 1848/// long) and is the same size and alignment as a pointer. The __null 1849/// extension is typically only used by system headers, which define 1850/// NULL as __null in C++ rather than using 0 (which is an integer 1851/// that may not match the size of a pointer). 1852class GNUNullExpr : public Expr { 1853 /// TokenLoc - The location of the __null keyword. 1854 SourceLocation TokenLoc; 1855 1856public: 1857 GNUNullExpr(QualType Ty, SourceLocation Loc) 1858 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1859 1860 /// \brief Build an empty GNU __null expression. 1861 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1862 1863 /// getTokenLocation - The location of the __null token. 1864 SourceLocation getTokenLocation() const { return TokenLoc; } 1865 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1866 1867 virtual SourceRange getSourceRange() const { 1868 return SourceRange(TokenLoc); 1869 } 1870 static bool classof(const Stmt *T) { 1871 return T->getStmtClass() == GNUNullExprClass; 1872 } 1873 static bool classof(const GNUNullExpr *) { return true; } 1874 1875 // Iterators 1876 virtual child_iterator child_begin(); 1877 virtual child_iterator child_end(); 1878 1879 virtual void EmitImpl(llvm::Serializer& S) const; 1880 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1881}; 1882 1883/// VAArgExpr, used for the builtin function __builtin_va_start. 1884class VAArgExpr : public Expr { 1885 Stmt *Val; 1886 SourceLocation BuiltinLoc, RParenLoc; 1887public: 1888 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1889 : Expr(VAArgExprClass, t), 1890 Val(e), 1891 BuiltinLoc(BLoc), 1892 RParenLoc(RPLoc) { } 1893 1894 /// \brief Create an empty __builtin_va_start expression. 1895 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1896 1897 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1898 Expr *getSubExpr() { return cast<Expr>(Val); } 1899 void setSubExpr(Expr *E) { Val = E; } 1900 1901 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1902 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1903 1904 SourceLocation getRParenLoc() const { return RParenLoc; } 1905 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1906 1907 virtual SourceRange getSourceRange() const { 1908 return SourceRange(BuiltinLoc, RParenLoc); 1909 } 1910 static bool classof(const Stmt *T) { 1911 return T->getStmtClass() == VAArgExprClass; 1912 } 1913 static bool classof(const VAArgExpr *) { return true; } 1914 1915 // Iterators 1916 virtual child_iterator child_begin(); 1917 virtual child_iterator child_end(); 1918 1919 virtual void EmitImpl(llvm::Serializer& S) const; 1920 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1921}; 1922 1923/// @brief Describes an C or C++ initializer list. 1924/// 1925/// InitListExpr describes an initializer list, which can be used to 1926/// initialize objects of different types, including 1927/// struct/class/union types, arrays, and vectors. For example: 1928/// 1929/// @code 1930/// struct foo x = { 1, { 2, 3 } }; 1931/// @endcode 1932/// 1933/// Prior to semantic analysis, an initializer list will represent the 1934/// initializer list as written by the user, but will have the 1935/// placeholder type "void". This initializer list is called the 1936/// syntactic form of the initializer, and may contain C99 designated 1937/// initializers (represented as DesignatedInitExprs), initializations 1938/// of subobject members without explicit braces, and so on. Clients 1939/// interested in the original syntax of the initializer list should 1940/// use the syntactic form of the initializer list. 1941/// 1942/// After semantic analysis, the initializer list will represent the 1943/// semantic form of the initializer, where the initializations of all 1944/// subobjects are made explicit with nested InitListExpr nodes and 1945/// C99 designators have been eliminated by placing the designated 1946/// initializations into the subobject they initialize. Additionally, 1947/// any "holes" in the initialization, where no initializer has been 1948/// specified for a particular subobject, will be replaced with 1949/// implicitly-generated ImplicitValueInitExpr expressions that 1950/// value-initialize the subobjects. Note, however, that the 1951/// initializer lists may still have fewer initializers than there are 1952/// elements to initialize within the object. 1953/// 1954/// Given the semantic form of the initializer list, one can retrieve 1955/// the original syntactic form of that initializer list (if it 1956/// exists) using getSyntacticForm(). Since many initializer lists 1957/// have the same syntactic and semantic forms, getSyntacticForm() may 1958/// return NULL, indicating that the current initializer list also 1959/// serves as its syntactic form. 1960class InitListExpr : public Expr { 1961 std::vector<Stmt *> InitExprs; 1962 SourceLocation LBraceLoc, RBraceLoc; 1963 1964 /// Contains the initializer list that describes the syntactic form 1965 /// written in the source code. 1966 InitListExpr *SyntacticForm; 1967 1968 /// If this initializer list initializes a union, specifies which 1969 /// field within the union will be initialized. 1970 FieldDecl *UnionFieldInit; 1971 1972 /// Whether this initializer list originally had a GNU array-range 1973 /// designator in it. This is a temporary marker used by CodeGen. 1974 bool HadArrayRangeDesignator; 1975 1976public: 1977 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1978 SourceLocation rbraceloc); 1979 1980 /// \brief Build an empty initializer list. 1981 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1982 1983 unsigned getNumInits() const { return InitExprs.size(); } 1984 1985 const Expr* getInit(unsigned Init) const { 1986 assert(Init < getNumInits() && "Initializer access out of range!"); 1987 return cast_or_null<Expr>(InitExprs[Init]); 1988 } 1989 1990 Expr* getInit(unsigned Init) { 1991 assert(Init < getNumInits() && "Initializer access out of range!"); 1992 return cast_or_null<Expr>(InitExprs[Init]); 1993 } 1994 1995 void setInit(unsigned Init, Expr *expr) { 1996 assert(Init < getNumInits() && "Initializer access out of range!"); 1997 InitExprs[Init] = expr; 1998 } 1999 2000 /// \brief Reserve space for some number of initializers. 2001 void reserveInits(unsigned NumInits); 2002 2003 /// @brief Specify the number of initializers 2004 /// 2005 /// If there are more than @p NumInits initializers, the remaining 2006 /// initializers will be destroyed. If there are fewer than @p 2007 /// NumInits initializers, NULL expressions will be added for the 2008 /// unknown initializers. 2009 void resizeInits(ASTContext &Context, unsigned NumInits); 2010 2011 /// @brief Updates the initializer at index @p Init with the new 2012 /// expression @p expr, and returns the old expression at that 2013 /// location. 2014 /// 2015 /// When @p Init is out of range for this initializer list, the 2016 /// initializer list will be extended with NULL expressions to 2017 /// accomodate the new entry. 2018 Expr *updateInit(unsigned Init, Expr *expr); 2019 2020 /// \brief If this initializes a union, specifies which field in the 2021 /// union to initialize. 2022 /// 2023 /// Typically, this field is the first named field within the 2024 /// union. However, a designated initializer can specify the 2025 /// initialization of a different field within the union. 2026 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2027 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2028 2029 // Explicit InitListExpr's originate from source code (and have valid source 2030 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2031 bool isExplicit() { 2032 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2033 } 2034 2035 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2036 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2037 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2038 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2039 2040 /// @brief Retrieve the initializer list that describes the 2041 /// syntactic form of the initializer. 2042 /// 2043 /// 2044 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2045 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2046 2047 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2048 void sawArrayRangeDesignator(bool ARD = true) { 2049 HadArrayRangeDesignator = ARD; 2050 } 2051 2052 virtual SourceRange getSourceRange() const { 2053 return SourceRange(LBraceLoc, RBraceLoc); 2054 } 2055 static bool classof(const Stmt *T) { 2056 return T->getStmtClass() == InitListExprClass; 2057 } 2058 static bool classof(const InitListExpr *) { return true; } 2059 2060 // Iterators 2061 virtual child_iterator child_begin(); 2062 virtual child_iterator child_end(); 2063 2064 typedef std::vector<Stmt *>::iterator iterator; 2065 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2066 2067 iterator begin() { return InitExprs.begin(); } 2068 iterator end() { return InitExprs.end(); } 2069 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2070 reverse_iterator rend() { return InitExprs.rend(); } 2071 2072 // Serailization. 2073 virtual void EmitImpl(llvm::Serializer& S) const; 2074 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2075 2076private: 2077 // Used by serializer. 2078 InitListExpr() : Expr(InitListExprClass, QualType()) {} 2079}; 2080 2081/// @brief Represents a C99 designated initializer expression. 2082/// 2083/// A designated initializer expression (C99 6.7.8) contains one or 2084/// more designators (which can be field designators, array 2085/// designators, or GNU array-range designators) followed by an 2086/// expression that initializes the field or element(s) that the 2087/// designators refer to. For example, given: 2088/// 2089/// @code 2090/// struct point { 2091/// double x; 2092/// double y; 2093/// }; 2094/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2095/// @endcode 2096/// 2097/// The InitListExpr contains three DesignatedInitExprs, the first of 2098/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2099/// designators, one array designator for @c [2] followed by one field 2100/// designator for @c .y. The initalization expression will be 1.0. 2101class DesignatedInitExpr : public Expr { 2102public: 2103 /// \brief Forward declaration of the Designator class. 2104 class Designator; 2105 2106private: 2107 /// The location of the '=' or ':' prior to the actual initializer 2108 /// expression. 2109 SourceLocation EqualOrColonLoc; 2110 2111 /// Whether this designated initializer used the GNU deprecated 2112 /// syntax rather than the C99 '=' syntax. 2113 bool GNUSyntax : 1; 2114 2115 /// The number of designators in this initializer expression. 2116 unsigned NumDesignators : 15; 2117 2118 /// \brief The designators in this designated initialization 2119 /// expression. 2120 Designator *Designators; 2121 2122 /// The number of subexpressions of this initializer expression, 2123 /// which contains both the initializer and any additional 2124 /// expressions used by array and array-range designators. 2125 unsigned NumSubExprs : 16; 2126 2127 2128 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2129 const Designator *Designators, 2130 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2131 unsigned NumSubExprs); 2132 2133 explicit DesignatedInitExpr(unsigned NumSubExprs) 2134 : Expr(DesignatedInitExprClass, EmptyShell()), 2135 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2136 2137public: 2138 /// A field designator, e.g., ".x". 2139 struct FieldDesignator { 2140 /// Refers to the field that is being initialized. The low bit 2141 /// of this field determines whether this is actually a pointer 2142 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2143 /// initially constructed, a field designator will store an 2144 /// IdentifierInfo*. After semantic analysis has resolved that 2145 /// name, the field designator will instead store a FieldDecl*. 2146 uintptr_t NameOrField; 2147 2148 /// The location of the '.' in the designated initializer. 2149 unsigned DotLoc; 2150 2151 /// The location of the field name in the designated initializer. 2152 unsigned FieldLoc; 2153 }; 2154 2155 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2156 struct ArrayOrRangeDesignator { 2157 /// Location of the first index expression within the designated 2158 /// initializer expression's list of subexpressions. 2159 unsigned Index; 2160 /// The location of the '[' starting the array range designator. 2161 unsigned LBracketLoc; 2162 /// The location of the ellipsis separating the start and end 2163 /// indices. Only valid for GNU array-range designators. 2164 unsigned EllipsisLoc; 2165 /// The location of the ']' terminating the array range designator. 2166 unsigned RBracketLoc; 2167 }; 2168 2169 /// @brief Represents a single C99 designator. 2170 /// 2171 /// @todo This class is infuriatingly similar to clang::Designator, 2172 /// but minor differences (storing indices vs. storing pointers) 2173 /// keep us from reusing it. Try harder, later, to rectify these 2174 /// differences. 2175 class Designator { 2176 /// @brief The kind of designator this describes. 2177 enum { 2178 FieldDesignator, 2179 ArrayDesignator, 2180 ArrayRangeDesignator 2181 } Kind; 2182 2183 union { 2184 /// A field designator, e.g., ".x". 2185 struct FieldDesignator Field; 2186 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2187 struct ArrayOrRangeDesignator ArrayOrRange; 2188 }; 2189 friend class DesignatedInitExpr; 2190 2191 public: 2192 Designator() {} 2193 2194 /// @brief Initializes a field designator. 2195 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2196 SourceLocation FieldLoc) 2197 : Kind(FieldDesignator) { 2198 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2199 Field.DotLoc = DotLoc.getRawEncoding(); 2200 Field.FieldLoc = FieldLoc.getRawEncoding(); 2201 } 2202 2203 /// @brief Initializes an array designator. 2204 Designator(unsigned Index, SourceLocation LBracketLoc, 2205 SourceLocation RBracketLoc) 2206 : Kind(ArrayDesignator) { 2207 ArrayOrRange.Index = Index; 2208 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2209 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2210 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2211 } 2212 2213 /// @brief Initializes a GNU array-range designator. 2214 Designator(unsigned Index, SourceLocation LBracketLoc, 2215 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2216 : Kind(ArrayRangeDesignator) { 2217 ArrayOrRange.Index = Index; 2218 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2219 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2220 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2221 } 2222 2223 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2224 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2225 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2226 2227 IdentifierInfo * getFieldName(); 2228 2229 FieldDecl *getField() { 2230 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2231 if (Field.NameOrField & 0x01) 2232 return 0; 2233 else 2234 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2235 } 2236 2237 void setField(FieldDecl *FD) { 2238 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2239 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2240 } 2241 2242 SourceLocation getDotLoc() const { 2243 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2244 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2245 } 2246 2247 SourceLocation getFieldLoc() const { 2248 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2249 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2250 } 2251 2252 SourceLocation getLBracketLoc() const { 2253 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2254 "Only valid on an array or array-range designator"); 2255 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2256 } 2257 2258 SourceLocation getRBracketLoc() const { 2259 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2260 "Only valid on an array or array-range designator"); 2261 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2262 } 2263 2264 SourceLocation getEllipsisLoc() const { 2265 assert(Kind == ArrayRangeDesignator && 2266 "Only valid on an array-range designator"); 2267 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2268 } 2269 2270 unsigned getFirstExprIndex() const { 2271 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2272 "Only valid on an array or array-range designator"); 2273 return ArrayOrRange.Index; 2274 } 2275 2276 SourceLocation getStartLocation() const { 2277 if (Kind == FieldDesignator) 2278 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2279 else 2280 return getLBracketLoc(); 2281 } 2282 }; 2283 2284 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2285 unsigned NumDesignators, 2286 Expr **IndexExprs, unsigned NumIndexExprs, 2287 SourceLocation EqualOrColonLoc, 2288 bool GNUSyntax, Expr *Init); 2289 2290 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2291 2292 /// @brief Returns the number of designators in this initializer. 2293 unsigned size() const { return NumDesignators; } 2294 2295 // Iterator access to the designators. 2296 typedef Designator* designators_iterator; 2297 designators_iterator designators_begin() { return Designators; } 2298 designators_iterator designators_end() { 2299 return Designators + NumDesignators; 2300 } 2301 2302 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2303 2304 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2305 2306 Expr *getArrayIndex(const Designator& D); 2307 Expr *getArrayRangeStart(const Designator& D); 2308 Expr *getArrayRangeEnd(const Designator& D); 2309 2310 /// @brief Retrieve the location of the '=' that precedes the 2311 /// initializer value itself, if present. 2312 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2313 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2314 2315 /// @brief Determines whether this designated initializer used the 2316 /// deprecated GNU syntax for designated initializers. 2317 bool usesGNUSyntax() const { return GNUSyntax; } 2318 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2319 2320 /// @brief Retrieve the initializer value. 2321 Expr *getInit() const { 2322 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2323 } 2324 2325 void setInit(Expr *init) { 2326 *child_begin() = init; 2327 } 2328 2329 /// \brief Retrieve the total number of subexpressions in this 2330 /// designated initializer expression, including the actual 2331 /// initialized value and any expressions that occur within array 2332 /// and array-range designators. 2333 unsigned getNumSubExprs() const { return NumSubExprs; } 2334 2335 Expr *getSubExpr(unsigned Idx) { 2336 assert(Idx < NumSubExprs && "Subscript out of range"); 2337 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2338 Ptr += sizeof(DesignatedInitExpr); 2339 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2340 } 2341 2342 void setSubExpr(unsigned Idx, Expr *E) { 2343 assert(Idx < NumSubExprs && "Subscript out of range"); 2344 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2345 Ptr += sizeof(DesignatedInitExpr); 2346 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2347 } 2348 2349 /// \brief Replaces the designator at index @p Idx with the series 2350 /// of designators in [First, Last). 2351 void ExpandDesignator(unsigned Idx, const Designator *First, 2352 const Designator *Last); 2353 2354 virtual SourceRange getSourceRange() const; 2355 2356 virtual void Destroy(ASTContext &C); 2357 2358 static bool classof(const Stmt *T) { 2359 return T->getStmtClass() == DesignatedInitExprClass; 2360 } 2361 static bool classof(const DesignatedInitExpr *) { return true; } 2362 2363 // Iterators 2364 virtual child_iterator child_begin(); 2365 virtual child_iterator child_end(); 2366}; 2367 2368/// \brief Represents an implicitly-generated value initialization of 2369/// an object of a given type. 2370/// 2371/// Implicit value initializations occur within semantic initializer 2372/// list expressions (InitListExpr) as placeholders for subobject 2373/// initializations not explicitly specified by the user. 2374/// 2375/// \see InitListExpr 2376class ImplicitValueInitExpr : public Expr { 2377public: 2378 explicit ImplicitValueInitExpr(QualType ty) 2379 : Expr(ImplicitValueInitExprClass, ty) { } 2380 2381 /// \brief Construct an empty implicit value initialization. 2382 explicit ImplicitValueInitExpr(EmptyShell Empty) 2383 : Expr(ImplicitValueInitExprClass, Empty) { } 2384 2385 static bool classof(const Stmt *T) { 2386 return T->getStmtClass() == ImplicitValueInitExprClass; 2387 } 2388 static bool classof(const ImplicitValueInitExpr *) { return true; } 2389 2390 virtual SourceRange getSourceRange() const { 2391 return SourceRange(); 2392 } 2393 2394 // Iterators 2395 virtual child_iterator child_begin(); 2396 virtual child_iterator child_end(); 2397}; 2398 2399//===----------------------------------------------------------------------===// 2400// Clang Extensions 2401//===----------------------------------------------------------------------===// 2402 2403 2404/// ExtVectorElementExpr - This represents access to specific elements of a 2405/// vector, and may occur on the left hand side or right hand side. For example 2406/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2407/// 2408/// Note that the base may have either vector or pointer to vector type, just 2409/// like a struct field reference. 2410/// 2411class ExtVectorElementExpr : public Expr { 2412 Stmt *Base; 2413 IdentifierInfo *Accessor; 2414 SourceLocation AccessorLoc; 2415public: 2416 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2417 SourceLocation loc) 2418 : Expr(ExtVectorElementExprClass, ty), 2419 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2420 2421 /// \brief Build an empty vector element expression. 2422 explicit ExtVectorElementExpr(EmptyShell Empty) 2423 : Expr(ExtVectorElementExprClass, Empty) { } 2424 2425 const Expr *getBase() const { return cast<Expr>(Base); } 2426 Expr *getBase() { return cast<Expr>(Base); } 2427 void setBase(Expr *E) { Base = E; } 2428 2429 IdentifierInfo &getAccessor() const { return *Accessor; } 2430 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2431 2432 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2433 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2434 2435 /// getNumElements - Get the number of components being selected. 2436 unsigned getNumElements() const; 2437 2438 /// containsDuplicateElements - Return true if any element access is 2439 /// repeated. 2440 bool containsDuplicateElements() const; 2441 2442 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2443 /// aggregate Constant of ConstantInt(s). 2444 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2445 2446 virtual SourceRange getSourceRange() const { 2447 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2448 } 2449 2450 /// isArrow - Return true if the base expression is a pointer to vector, 2451 /// return false if the base expression is a vector. 2452 bool isArrow() const; 2453 2454 static bool classof(const Stmt *T) { 2455 return T->getStmtClass() == ExtVectorElementExprClass; 2456 } 2457 static bool classof(const ExtVectorElementExpr *) { return true; } 2458 2459 // Iterators 2460 virtual child_iterator child_begin(); 2461 virtual child_iterator child_end(); 2462 2463 virtual void EmitImpl(llvm::Serializer& S) const; 2464 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2465}; 2466 2467 2468/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2469/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2470class BlockExpr : public Expr { 2471protected: 2472 BlockDecl *TheBlock; 2473 bool HasBlockDeclRefExprs; 2474public: 2475 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2476 : Expr(BlockExprClass, ty), 2477 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2478 2479 const BlockDecl *getBlockDecl() const { return TheBlock; } 2480 BlockDecl *getBlockDecl() { return TheBlock; } 2481 2482 // Convenience functions for probing the underlying BlockDecl. 2483 SourceLocation getCaretLocation() const; 2484 const Stmt *getBody() const; 2485 Stmt *getBody(); 2486 2487 virtual SourceRange getSourceRange() const { 2488 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2489 } 2490 2491 /// getFunctionType - Return the underlying function type for this block. 2492 const FunctionType *getFunctionType() const; 2493 2494 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2495 /// contained inside. 2496 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2497 2498 static bool classof(const Stmt *T) { 2499 return T->getStmtClass() == BlockExprClass; 2500 } 2501 static bool classof(const BlockExpr *) { return true; } 2502 2503 // Iterators 2504 virtual child_iterator child_begin(); 2505 virtual child_iterator child_end(); 2506 2507 virtual void EmitImpl(llvm::Serializer& S) const; 2508 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2509}; 2510 2511/// BlockDeclRefExpr - A reference to a declared variable, function, 2512/// enum, etc. 2513class BlockDeclRefExpr : public Expr { 2514 ValueDecl *D; 2515 SourceLocation Loc; 2516 bool IsByRef; 2517public: 2518 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2519 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2520 2521 // \brief Build an empty reference to a declared variable in a 2522 // block. 2523 explicit BlockDeclRefExpr(EmptyShell Empty) 2524 : Expr(BlockDeclRefExprClass, Empty) { } 2525 2526 ValueDecl *getDecl() { return D; } 2527 const ValueDecl *getDecl() const { return D; } 2528 void setDecl(ValueDecl *VD) { D = VD; } 2529 2530 SourceLocation getLocation() const { return Loc; } 2531 void setLocation(SourceLocation L) { Loc = L; } 2532 2533 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2534 2535 bool isByRef() const { return IsByRef; } 2536 void setByRef(bool BR) { IsByRef = BR; } 2537 2538 static bool classof(const Stmt *T) { 2539 return T->getStmtClass() == BlockDeclRefExprClass; 2540 } 2541 static bool classof(const BlockDeclRefExpr *) { return true; } 2542 2543 // Iterators 2544 virtual child_iterator child_begin(); 2545 virtual child_iterator child_end(); 2546 2547 virtual void EmitImpl(llvm::Serializer& S) const; 2548 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2549}; 2550 2551} // end namespace clang 2552 2553#endif 2554