Expr.h revision 42602bb40aefcc2751d4078ba88aacf4d965c9bd
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 44protected: 45 /// TypeDependent - Whether this expression is type-dependent 46 /// (C++ [temp.dep.expr]). 47 bool TypeDependent : 1; 48 49 /// ValueDependent - Whether this expression is value-dependent 50 /// (C++ [temp.dep.constexpr]). 51 bool ValueDependent : 1; 52 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66 /// \brief Construct an empty expression. 67 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 68 69public: 70 QualType getType() const { return TR; } 71 void setType(QualType t) { 72 // In C++, the type of an expression is always adjusted so that it 73 // will not have reference type an expression will never have 74 // reference type (C++ [expr]p6). Use 75 // QualType::getNonReferenceType() to retrieve the non-reference 76 // type. Additionally, inspect Expr::isLvalue to determine whether 77 // an expression that is adjusted in this manner should be 78 // considered an lvalue. 79 assert((TR.isNull() || !TR->isReferenceType()) && 80 "Expressions can't have reference type"); 81 82 TR = t; 83 } 84 85 /// isValueDependent - Determines whether this expression is 86 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 87 /// array bound of "Chars" in the following example is 88 /// value-dependent. 89 /// @code 90 /// template<int Size, char (&Chars)[Size]> struct meta_string; 91 /// @endcode 92 bool isValueDependent() const { return ValueDependent; } 93 94 /// \brief Set whether this expression is value-dependent or not. 95 void setValueDependent(bool VD) { ValueDependent = VD; } 96 97 /// isTypeDependent - Determines whether this expression is 98 /// type-dependent (C++ [temp.dep.expr]), which means that its type 99 /// could change from one template instantiation to the next. For 100 /// example, the expressions "x" and "x + y" are type-dependent in 101 /// the following code, but "y" is not type-dependent: 102 /// @code 103 /// template<typename T> 104 /// void add(T x, int y) { 105 /// x + y; 106 /// } 107 /// @endcode 108 bool isTypeDependent() const { return TypeDependent; } 109 110 /// \brief Set whether this expression is type-dependent or not. 111 void setTypeDependent(bool TD) { TypeDependent = TD; } 112 113 /// SourceLocation tokens are not useful in isolation - they are low level 114 /// value objects created/interpreted by SourceManager. We assume AST 115 /// clients will have a pointer to the respective SourceManager. 116 virtual SourceRange getSourceRange() const = 0; 117 118 /// getExprLoc - Return the preferred location for the arrow when diagnosing 119 /// a problem with a generic expression. 120 virtual SourceLocation getExprLoc() const { return getLocStart(); } 121 122 /// isUnusedResultAWarning - Return true if this immediate expression should 123 /// be warned about if the result is unused. If so, fill in Loc and Ranges 124 /// with location to warn on and the source range[s] to report with the 125 /// warning. 126 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 127 SourceRange &R2) const; 128 129 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 130 /// incomplete type other than void. Nonarray expressions that can be lvalues: 131 /// - name, where name must be a variable 132 /// - e[i] 133 /// - (e), where e must be an lvalue 134 /// - e.name, where e must be an lvalue 135 /// - e->name 136 /// - *e, the type of e cannot be a function type 137 /// - string-constant 138 /// - reference type [C++ [expr]] 139 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 140 /// 141 enum isLvalueResult { 142 LV_Valid, 143 LV_NotObjectType, 144 LV_IncompleteVoidType, 145 LV_DuplicateVectorComponents, 146 LV_InvalidExpression, 147 LV_MemberFunction 148 }; 149 isLvalueResult isLvalue(ASTContext &Ctx) const; 150 151 // Same as above, but excluding checks for non-object and void types in C 152 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 153 154 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 155 /// does not have an incomplete type, does not have a const-qualified type, 156 /// and if it is a structure or union, does not have any member (including, 157 /// recursively, any member or element of all contained aggregates or unions) 158 /// with a const-qualified type. 159 /// 160 /// \param Loc [in] [out] - A source location which *may* be filled 161 /// in with the location of the expression making this a 162 /// non-modifiable lvalue, if specified. 163 enum isModifiableLvalueResult { 164 MLV_Valid, 165 MLV_NotObjectType, 166 MLV_IncompleteVoidType, 167 MLV_DuplicateVectorComponents, 168 MLV_InvalidExpression, 169 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 170 MLV_IncompleteType, 171 MLV_ConstQualified, 172 MLV_ArrayType, 173 MLV_NotBlockQualified, 174 MLV_ReadonlyProperty, 175 MLV_NoSetterProperty, 176 MLV_MemberFunction 177 }; 178 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 179 SourceLocation *Loc = 0) const; 180 181 /// \brief If this expression refers to a bit-field, retrieve the 182 /// declaration of that bit-field. 183 FieldDecl *getBitField(); 184 185 const FieldDecl *getBitField() const { 186 return const_cast<Expr*>(this)->getBitField(); 187 } 188 189 /// isIntegerConstantExpr - Return true if this expression is a valid integer 190 /// constant expression, and, if so, return its value in Result. If not a 191 /// valid i-c-e, return false and fill in Loc (if specified) with the location 192 /// of the invalid expression. 193 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 194 SourceLocation *Loc = 0, 195 bool isEvaluated = true) const; 196 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 197 llvm::APSInt X; 198 return isIntegerConstantExpr(X, Ctx, Loc); 199 } 200 /// isConstantInitializer - Returns true if this expression is a constant 201 /// initializer, which can be emitted at compile-time. 202 bool isConstantInitializer(ASTContext &Ctx) const; 203 204 /// EvalResult is a struct with detailed info about an evaluated expression. 205 struct EvalResult { 206 /// Val - This is the value the expression can be folded to. 207 APValue Val; 208 209 /// HasSideEffects - Whether the evaluated expression has side effects. 210 /// For example, (f() && 0) can be folded, but it still has side effects. 211 bool HasSideEffects; 212 213 /// Diag - If the expression is unfoldable, then Diag contains a note 214 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 215 /// position for the error, and DiagExpr is the expression that caused 216 /// the error. 217 /// If the expression is foldable, but not an integer constant expression, 218 /// Diag contains a note diagnostic that describes why it isn't an integer 219 /// constant expression. If the expression *is* an integer constant 220 /// expression, then Diag will be zero. 221 unsigned Diag; 222 const Expr *DiagExpr; 223 SourceLocation DiagLoc; 224 225 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 226 }; 227 228 /// Evaluate - Return true if this is a constant which we can fold using 229 /// any crazy technique (that has nothing to do with language standards) that 230 /// we want to. If this function returns true, it returns the folded constant 231 /// in Result. 232 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 233 234 /// isEvaluatable - Call Evaluate to see if this expression can be constant 235 /// folded, but discard the result. 236 bool isEvaluatable(ASTContext &Ctx) const; 237 238 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 239 /// must be called on an expression that constant folds to an integer. 240 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 241 242 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 243 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 244 245 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 246 /// integer constant expression with the value zero, or if this is one that is 247 /// cast to void*. 248 bool isNullPointerConstant(ASTContext &Ctx) const; 249 250 /// hasGlobalStorage - Return true if this expression has static storage 251 /// duration. This means that the address of this expression is a link-time 252 /// constant. 253 bool hasGlobalStorage() const; 254 255 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 256 /// write barrier. 257 bool isOBJCGCCandidate(ASTContext &Ctx) const; 258 259 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 260 /// its subexpression. If that subexpression is also a ParenExpr, 261 /// then this method recursively returns its subexpression, and so forth. 262 /// Otherwise, the method returns the current Expr. 263 Expr* IgnoreParens(); 264 265 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 266 /// or CastExprs, returning their operand. 267 Expr *IgnoreParenCasts(); 268 269 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 270 /// value (including ptr->int casts of the same size). Strip off any 271 /// ParenExpr or CastExprs, returning their operand. 272 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 273 274 const Expr* IgnoreParens() const { 275 return const_cast<Expr*>(this)->IgnoreParens(); 276 } 277 const Expr *IgnoreParenCasts() const { 278 return const_cast<Expr*>(this)->IgnoreParenCasts(); 279 } 280 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 281 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 282 } 283 284 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 285 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 286 287 static bool classof(const Stmt *T) { 288 return T->getStmtClass() >= firstExprConstant && 289 T->getStmtClass() <= lastExprConstant; 290 } 291 static bool classof(const Expr *) { return true; } 292}; 293 294 295//===----------------------------------------------------------------------===// 296// Primary Expressions. 297//===----------------------------------------------------------------------===// 298 299/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 300/// enum, etc. 301class DeclRefExpr : public Expr { 302 NamedDecl *D; 303 SourceLocation Loc; 304 305protected: 306 // FIXME: Eventually, this constructor will go away and all subclasses 307 // will have to provide the type- and value-dependent flags. 308 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 309 Expr(SC, t), D(d), Loc(l) {} 310 311 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 312 bool VD) : 313 Expr(SC, t, TD, VD), D(d), Loc(l) {} 314 315public: 316 // FIXME: Eventually, this constructor will go away and all clients 317 // will have to provide the type- and value-dependent flags. 318 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 319 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 320 321 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 322 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 323 324 /// \brief Construct an empty declaration reference expression. 325 explicit DeclRefExpr(EmptyShell Empty) 326 : Expr(DeclRefExprClass, Empty) { } 327 328 NamedDecl *getDecl() { return D; } 329 const NamedDecl *getDecl() const { return D; } 330 void setDecl(NamedDecl *NewD) { D = NewD; } 331 332 SourceLocation getLocation() const { return Loc; } 333 void setLocation(SourceLocation L) { Loc = L; } 334 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 335 336 static bool classof(const Stmt *T) { 337 return T->getStmtClass() == DeclRefExprClass || 338 T->getStmtClass() == CXXConditionDeclExprClass || 339 T->getStmtClass() == QualifiedDeclRefExprClass; 340 } 341 static bool classof(const DeclRefExpr *) { return true; } 342 343 // Iterators 344 virtual child_iterator child_begin(); 345 virtual child_iterator child_end(); 346}; 347 348/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 349class PredefinedExpr : public Expr { 350public: 351 enum IdentType { 352 Func, 353 Function, 354 PrettyFunction 355 }; 356 357private: 358 SourceLocation Loc; 359 IdentType Type; 360public: 361 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 362 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 363 364 /// \brief Construct an empty predefined expression. 365 explicit PredefinedExpr(EmptyShell Empty) 366 : Expr(PredefinedExprClass, Empty) { } 367 368 PredefinedExpr* Clone(ASTContext &C) const; 369 370 IdentType getIdentType() const { return Type; } 371 void setIdentType(IdentType IT) { Type = IT; } 372 373 SourceLocation getLocation() const { return Loc; } 374 void setLocation(SourceLocation L) { Loc = L; } 375 376 // FIXME: The logic for computing the value of a predefined expr should go 377 // into a method here that takes the inner-most code decl (a block, function 378 // or objc method) that the expr lives in. This would allow sema and codegen 379 // to be consistent for things like sizeof(__func__) etc. 380 381 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 382 383 static bool classof(const Stmt *T) { 384 return T->getStmtClass() == PredefinedExprClass; 385 } 386 static bool classof(const PredefinedExpr *) { return true; } 387 388 // Iterators 389 virtual child_iterator child_begin(); 390 virtual child_iterator child_end(); 391}; 392 393class IntegerLiteral : public Expr { 394 llvm::APInt Value; 395 SourceLocation Loc; 396public: 397 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 398 // or UnsignedLongLongTy 399 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 400 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 401 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 402 } 403 404 /// \brief Construct an empty integer literal. 405 explicit IntegerLiteral(EmptyShell Empty) 406 : Expr(IntegerLiteralClass, Empty) { } 407 408 IntegerLiteral* Clone(ASTContext &C) const; 409 410 const llvm::APInt &getValue() const { return Value; } 411 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 412 413 /// \brief Retrieve the location of the literal. 414 SourceLocation getLocation() const { return Loc; } 415 416 void setValue(const llvm::APInt &Val) { Value = Val; } 417 void setLocation(SourceLocation Location) { Loc = Location; } 418 419 static bool classof(const Stmt *T) { 420 return T->getStmtClass() == IntegerLiteralClass; 421 } 422 static bool classof(const IntegerLiteral *) { return true; } 423 424 // Iterators 425 virtual child_iterator child_begin(); 426 virtual child_iterator child_end(); 427}; 428 429class CharacterLiteral : public Expr { 430 unsigned Value; 431 SourceLocation Loc; 432 bool IsWide; 433public: 434 // type should be IntTy 435 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 436 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 437 } 438 439 /// \brief Construct an empty character literal. 440 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 441 442 CharacterLiteral* Clone(ASTContext &C) const; 443 444 SourceLocation getLoc() const { return Loc; } 445 bool isWide() const { return IsWide; } 446 447 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 448 449 unsigned getValue() const { return Value; } 450 451 void setLocation(SourceLocation Location) { Loc = Location; } 452 void setWide(bool W) { IsWide = W; } 453 void setValue(unsigned Val) { Value = Val; } 454 455 static bool classof(const Stmt *T) { 456 return T->getStmtClass() == CharacterLiteralClass; 457 } 458 static bool classof(const CharacterLiteral *) { return true; } 459 460 // Iterators 461 virtual child_iterator child_begin(); 462 virtual child_iterator child_end(); 463}; 464 465class FloatingLiteral : public Expr { 466 llvm::APFloat Value; 467 bool IsExact : 1; 468 SourceLocation Loc; 469public: 470 FloatingLiteral(const llvm::APFloat &V, bool isexact, 471 QualType Type, SourceLocation L) 472 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 473 474 /// \brief Construct an empty floating-point literal. 475 explicit FloatingLiteral(EmptyShell Empty) 476 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 477 478 FloatingLiteral* Clone(ASTContext &C) const; 479 480 const llvm::APFloat &getValue() const { return Value; } 481 void setValue(const llvm::APFloat &Val) { Value = Val; } 482 483 bool isExact() const { return IsExact; } 484 void setExact(bool E) { IsExact = E; } 485 486 /// getValueAsApproximateDouble - This returns the value as an inaccurate 487 /// double. Note that this may cause loss of precision, but is useful for 488 /// debugging dumps, etc. 489 double getValueAsApproximateDouble() const; 490 491 SourceLocation getLocation() const { return Loc; } 492 void setLocation(SourceLocation L) { Loc = L; } 493 494 // FIXME: The logic for computing the value of a predefined expr should go 495 // into a method here that takes the inner-most code decl (a block, function 496 // or objc method) that the expr lives in. This would allow sema and codegen 497 // to be consistent for things like sizeof(__func__) etc. 498 499 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 500 501 static bool classof(const Stmt *T) { 502 return T->getStmtClass() == FloatingLiteralClass; 503 } 504 static bool classof(const FloatingLiteral *) { return true; } 505 506 // Iterators 507 virtual child_iterator child_begin(); 508 virtual child_iterator child_end(); 509}; 510 511/// ImaginaryLiteral - We support imaginary integer and floating point literals, 512/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 513/// IntegerLiteral classes. Instances of this class always have a Complex type 514/// whose element type matches the subexpression. 515/// 516class ImaginaryLiteral : public Expr { 517 Stmt *Val; 518public: 519 ImaginaryLiteral(Expr *val, QualType Ty) 520 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 521 522 /// \brief Build an empty imaginary literal. 523 explicit ImaginaryLiteral(EmptyShell Empty) 524 : Expr(ImaginaryLiteralClass, Empty) { } 525 526 const Expr *getSubExpr() const { return cast<Expr>(Val); } 527 Expr *getSubExpr() { return cast<Expr>(Val); } 528 void setSubExpr(Expr *E) { Val = E; } 529 530 ImaginaryLiteral* Clone(ASTContext &C) const; 531 532 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 533 static bool classof(const Stmt *T) { 534 return T->getStmtClass() == ImaginaryLiteralClass; 535 } 536 static bool classof(const ImaginaryLiteral *) { return true; } 537 538 // Iterators 539 virtual child_iterator child_begin(); 540 virtual child_iterator child_end(); 541}; 542 543/// StringLiteral - This represents a string literal expression, e.g. "foo" 544/// or L"bar" (wide strings). The actual string is returned by getStrData() 545/// is NOT null-terminated, and the length of the string is determined by 546/// calling getByteLength(). The C type for a string is always a 547/// ConstantArrayType. In C++, the char type is const qualified, in C it is 548/// not. 549/// 550/// Note that strings in C can be formed by concatenation of multiple string 551/// literal pptokens in translation phase #6. This keeps track of the locations 552/// of each of these pieces. 553/// 554/// Strings in C can also be truncated and extended by assigning into arrays, 555/// e.g. with constructs like: 556/// char X[2] = "foobar"; 557/// In this case, getByteLength() will return 6, but the string literal will 558/// have type "char[2]". 559class StringLiteral : public Expr { 560 const char *StrData; 561 unsigned ByteLength; 562 bool IsWide; 563 unsigned NumConcatenated; 564 SourceLocation TokLocs[1]; 565 566 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 567 568protected: 569 virtual void DoDestroy(ASTContext &C); 570 571public: 572 /// This is the "fully general" constructor that allows representation of 573 /// strings formed from multiple concatenated tokens. 574 static StringLiteral *Create(ASTContext &C, const char *StrData, 575 unsigned ByteLength, bool Wide, QualType Ty, 576 const SourceLocation *Loc, unsigned NumStrs); 577 578 /// Simple constructor for string literals made from one token. 579 static StringLiteral *Create(ASTContext &C, const char *StrData, 580 unsigned ByteLength, 581 bool Wide, QualType Ty, SourceLocation Loc) { 582 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 583 } 584 585 /// \brief Construct an empty string literal. 586 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 587 588 StringLiteral* Clone(ASTContext &C) const; 589 590 const char *getStrData() const { return StrData; } 591 unsigned getByteLength() const { return ByteLength; } 592 593 /// \brief Sets the string data to the given string data. 594 void setStrData(ASTContext &C, const char *Str, unsigned Len); 595 596 bool isWide() const { return IsWide; } 597 void setWide(bool W) { IsWide = W; } 598 599 bool containsNonAsciiOrNull() const { 600 for (unsigned i = 0; i < getByteLength(); ++i) 601 if (!isascii(getStrData()[i]) || !getStrData()[i]) 602 return true; 603 return false; 604 } 605 /// getNumConcatenated - Get the number of string literal tokens that were 606 /// concatenated in translation phase #6 to form this string literal. 607 unsigned getNumConcatenated() const { return NumConcatenated; } 608 609 SourceLocation getStrTokenLoc(unsigned TokNum) const { 610 assert(TokNum < NumConcatenated && "Invalid tok number"); 611 return TokLocs[TokNum]; 612 } 613 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 614 assert(TokNum < NumConcatenated && "Invalid tok number"); 615 TokLocs[TokNum] = L; 616 } 617 618 typedef const SourceLocation *tokloc_iterator; 619 tokloc_iterator tokloc_begin() const { return TokLocs; } 620 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 621 622 virtual SourceRange getSourceRange() const { 623 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 624 } 625 static bool classof(const Stmt *T) { 626 return T->getStmtClass() == StringLiteralClass; 627 } 628 static bool classof(const StringLiteral *) { return true; } 629 630 // Iterators 631 virtual child_iterator child_begin(); 632 virtual child_iterator child_end(); 633}; 634 635/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 636/// AST node is only formed if full location information is requested. 637class ParenExpr : public Expr { 638 SourceLocation L, R; 639 Stmt *Val; 640public: 641 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 642 : Expr(ParenExprClass, val->getType(), 643 val->isTypeDependent(), val->isValueDependent()), 644 L(l), R(r), Val(val) {} 645 646 /// \brief Construct an empty parenthesized expression. 647 explicit ParenExpr(EmptyShell Empty) 648 : Expr(ParenExprClass, Empty) { } 649 650 const Expr *getSubExpr() const { return cast<Expr>(Val); } 651 Expr *getSubExpr() { return cast<Expr>(Val); } 652 void setSubExpr(Expr *E) { Val = E; } 653 654 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 655 656 /// \brief Get the location of the left parentheses '('. 657 SourceLocation getLParen() const { return L; } 658 void setLParen(SourceLocation Loc) { L = Loc; } 659 660 /// \brief Get the location of the right parentheses ')'. 661 SourceLocation getRParen() const { return R; } 662 void setRParen(SourceLocation Loc) { R = Loc; } 663 664 static bool classof(const Stmt *T) { 665 return T->getStmtClass() == ParenExprClass; 666 } 667 static bool classof(const ParenExpr *) { return true; } 668 669 // Iterators 670 virtual child_iterator child_begin(); 671 virtual child_iterator child_end(); 672}; 673 674 675/// UnaryOperator - This represents the unary-expression's (except sizeof and 676/// alignof), the postinc/postdec operators from postfix-expression, and various 677/// extensions. 678/// 679/// Notes on various nodes: 680/// 681/// Real/Imag - These return the real/imag part of a complex operand. If 682/// applied to a non-complex value, the former returns its operand and the 683/// later returns zero in the type of the operand. 684/// 685/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 686/// subexpression is a compound literal with the various MemberExpr and 687/// ArraySubscriptExpr's applied to it. 688/// 689class UnaryOperator : public Expr { 690public: 691 // Note that additions to this should also update the StmtVisitor class. 692 enum Opcode { 693 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 694 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 695 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 696 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 697 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 698 Real, Imag, // "__real expr"/"__imag expr" Extension. 699 Extension, // __extension__ marker. 700 OffsetOf // __builtin_offsetof 701 }; 702private: 703 Stmt *Val; 704 Opcode Opc; 705 SourceLocation Loc; 706public: 707 708 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 709 : Expr(UnaryOperatorClass, type, 710 input->isTypeDependent() && opc != OffsetOf, 711 input->isValueDependent()), 712 Val(input), Opc(opc), Loc(l) {} 713 714 /// \brief Build an empty unary operator. 715 explicit UnaryOperator(EmptyShell Empty) 716 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 717 718 Opcode getOpcode() const { return Opc; } 719 void setOpcode(Opcode O) { Opc = O; } 720 721 Expr *getSubExpr() const { return cast<Expr>(Val); } 722 void setSubExpr(Expr *E) { Val = E; } 723 724 /// getOperatorLoc - Return the location of the operator. 725 SourceLocation getOperatorLoc() const { return Loc; } 726 void setOperatorLoc(SourceLocation L) { Loc = L; } 727 728 /// isPostfix - Return true if this is a postfix operation, like x++. 729 static bool isPostfix(Opcode Op) { 730 return Op == PostInc || Op == PostDec; 731 } 732 733 /// isPostfix - Return true if this is a prefix operation, like --x. 734 static bool isPrefix(Opcode Op) { 735 return Op == PreInc || Op == PreDec; 736 } 737 738 bool isPrefix() const { return isPrefix(Opc); } 739 bool isPostfix() const { return isPostfix(Opc); } 740 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 741 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 742 bool isOffsetOfOp() const { return Opc == OffsetOf; } 743 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 744 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 745 746 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 747 /// corresponds to, e.g. "sizeof" or "[pre]++" 748 static const char *getOpcodeStr(Opcode Op); 749 750 /// \brief Retrieve the unary opcode that corresponds to the given 751 /// overloaded operator. 752 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 753 754 /// \brief Retrieve the overloaded operator kind that corresponds to 755 /// the given unary opcode. 756 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 757 758 virtual SourceRange getSourceRange() const { 759 if (isPostfix()) 760 return SourceRange(Val->getLocStart(), Loc); 761 else 762 return SourceRange(Loc, Val->getLocEnd()); 763 } 764 virtual SourceLocation getExprLoc() const { return Loc; } 765 766 static bool classof(const Stmt *T) { 767 return T->getStmtClass() == UnaryOperatorClass; 768 } 769 static bool classof(const UnaryOperator *) { return true; } 770 771 // Iterators 772 virtual child_iterator child_begin(); 773 virtual child_iterator child_end(); 774}; 775 776/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 777/// types and expressions. 778class SizeOfAlignOfExpr : public Expr { 779 bool isSizeof : 1; // true if sizeof, false if alignof. 780 bool isType : 1; // true if operand is a type, false if an expression 781 union { 782 void *Ty; 783 Stmt *Ex; 784 } Argument; 785 SourceLocation OpLoc, RParenLoc; 786 787protected: 788 virtual void DoDestroy(ASTContext& C); 789 790public: 791 SizeOfAlignOfExpr(bool issizeof, QualType T, 792 QualType resultType, SourceLocation op, 793 SourceLocation rp) : 794 Expr(SizeOfAlignOfExprClass, resultType, 795 false, // Never type-dependent (C++ [temp.dep.expr]p3). 796 // Value-dependent if the argument is type-dependent. 797 T->isDependentType()), 798 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 799 Argument.Ty = T.getAsOpaquePtr(); 800 } 801 802 SizeOfAlignOfExpr(bool issizeof, Expr *E, 803 QualType resultType, SourceLocation op, 804 SourceLocation rp) : 805 Expr(SizeOfAlignOfExprClass, resultType, 806 false, // Never type-dependent (C++ [temp.dep.expr]p3). 807 // Value-dependent if the argument is type-dependent. 808 E->isTypeDependent()), 809 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 810 Argument.Ex = E; 811 } 812 813 /// \brief Construct an empty sizeof/alignof expression. 814 explicit SizeOfAlignOfExpr(EmptyShell Empty) 815 : Expr(SizeOfAlignOfExprClass, Empty) { } 816 817 bool isSizeOf() const { return isSizeof; } 818 void setSizeof(bool S) { isSizeof = S; } 819 820 bool isArgumentType() const { return isType; } 821 QualType getArgumentType() const { 822 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 823 return QualType::getFromOpaquePtr(Argument.Ty); 824 } 825 Expr *getArgumentExpr() { 826 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 827 return static_cast<Expr*>(Argument.Ex); 828 } 829 const Expr *getArgumentExpr() const { 830 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 831 } 832 833 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 834 void setArgument(QualType T) { 835 Argument.Ty = T.getAsOpaquePtr(); 836 isType = true; 837 } 838 839 /// Gets the argument type, or the type of the argument expression, whichever 840 /// is appropriate. 841 QualType getTypeOfArgument() const { 842 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 843 } 844 845 SourceLocation getOperatorLoc() const { return OpLoc; } 846 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 847 848 SourceLocation getRParenLoc() const { return RParenLoc; } 849 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 850 851 virtual SourceRange getSourceRange() const { 852 return SourceRange(OpLoc, RParenLoc); 853 } 854 855 static bool classof(const Stmt *T) { 856 return T->getStmtClass() == SizeOfAlignOfExprClass; 857 } 858 static bool classof(const SizeOfAlignOfExpr *) { return true; } 859 860 // Iterators 861 virtual child_iterator child_begin(); 862 virtual child_iterator child_end(); 863}; 864 865//===----------------------------------------------------------------------===// 866// Postfix Operators. 867//===----------------------------------------------------------------------===// 868 869/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 870class ArraySubscriptExpr : public Expr { 871 enum { LHS, RHS, END_EXPR=2 }; 872 Stmt* SubExprs[END_EXPR]; 873 SourceLocation RBracketLoc; 874public: 875 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 876 SourceLocation rbracketloc) 877 : Expr(ArraySubscriptExprClass, t, 878 lhs->isTypeDependent() || rhs->isTypeDependent(), 879 lhs->isValueDependent() || rhs->isValueDependent()), 880 RBracketLoc(rbracketloc) { 881 SubExprs[LHS] = lhs; 882 SubExprs[RHS] = rhs; 883 } 884 885 /// \brief Create an empty array subscript expression. 886 explicit ArraySubscriptExpr(EmptyShell Shell) 887 : Expr(ArraySubscriptExprClass, Shell) { } 888 889 /// An array access can be written A[4] or 4[A] (both are equivalent). 890 /// - getBase() and getIdx() always present the normalized view: A[4]. 891 /// In this case getBase() returns "A" and getIdx() returns "4". 892 /// - getLHS() and getRHS() present the syntactic view. e.g. for 893 /// 4[A] getLHS() returns "4". 894 /// Note: Because vector element access is also written A[4] we must 895 /// predicate the format conversion in getBase and getIdx only on the 896 /// the type of the RHS, as it is possible for the LHS to be a vector of 897 /// integer type 898 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 899 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 900 void setLHS(Expr *E) { SubExprs[LHS] = E; } 901 902 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 903 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 904 void setRHS(Expr *E) { SubExprs[RHS] = E; } 905 906 Expr *getBase() { 907 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 908 } 909 910 const Expr *getBase() const { 911 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 912 } 913 914 Expr *getIdx() { 915 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 916 } 917 918 const Expr *getIdx() const { 919 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 920 } 921 922 virtual SourceRange getSourceRange() const { 923 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 924 } 925 926 SourceLocation getRBracketLoc() const { return RBracketLoc; } 927 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 928 929 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 930 931 static bool classof(const Stmt *T) { 932 return T->getStmtClass() == ArraySubscriptExprClass; 933 } 934 static bool classof(const ArraySubscriptExpr *) { return true; } 935 936 // Iterators 937 virtual child_iterator child_begin(); 938 virtual child_iterator child_end(); 939}; 940 941 942/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 943/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 944/// while its subclasses may represent alternative syntax that (semantically) 945/// results in a function call. For example, CXXOperatorCallExpr is 946/// a subclass for overloaded operator calls that use operator syntax, e.g., 947/// "str1 + str2" to resolve to a function call. 948class CallExpr : public Expr { 949 enum { FN=0, ARGS_START=1 }; 950 Stmt **SubExprs; 951 unsigned NumArgs; 952 SourceLocation RParenLoc; 953 954protected: 955 // This version of the constructor is for derived classes. 956 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 957 QualType t, SourceLocation rparenloc); 958 959 virtual void DoDestroy(ASTContext& C); 960 961public: 962 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 963 SourceLocation rparenloc); 964 965 /// \brief Build an empty call expression. 966 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 967 968 ~CallExpr() {} 969 970 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 971 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 972 void setCallee(Expr *F) { SubExprs[FN] = F; } 973 974 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 975 FunctionDecl *getDirectCallee(); 976 977 /// getNumArgs - Return the number of actual arguments to this call. 978 /// 979 unsigned getNumArgs() const { return NumArgs; } 980 981 /// getArg - Return the specified argument. 982 Expr *getArg(unsigned Arg) { 983 assert(Arg < NumArgs && "Arg access out of range!"); 984 return cast<Expr>(SubExprs[Arg+ARGS_START]); 985 } 986 const Expr *getArg(unsigned Arg) const { 987 assert(Arg < NumArgs && "Arg access out of range!"); 988 return cast<Expr>(SubExprs[Arg+ARGS_START]); 989 } 990 991 /// setArg - Set the specified argument. 992 void setArg(unsigned Arg, Expr *ArgExpr) { 993 assert(Arg < NumArgs && "Arg access out of range!"); 994 SubExprs[Arg+ARGS_START] = ArgExpr; 995 } 996 997 /// setNumArgs - This changes the number of arguments present in this call. 998 /// Any orphaned expressions are deleted by this, and any new operands are set 999 /// to null. 1000 void setNumArgs(ASTContext& C, unsigned NumArgs); 1001 1002 typedef ExprIterator arg_iterator; 1003 typedef ConstExprIterator const_arg_iterator; 1004 1005 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1006 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1007 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1008 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1009 1010 /// getNumCommas - Return the number of commas that must have been present in 1011 /// this function call. 1012 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1013 1014 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1015 /// not, return 0. 1016 unsigned isBuiltinCall(ASTContext &Context) const; 1017 1018 /// getCallReturnType - Get the return type of the call expr. This is not 1019 /// always the type of the expr itself, if the return type is a reference 1020 /// type. 1021 QualType getCallReturnType() const; 1022 1023 SourceLocation getRParenLoc() const { return RParenLoc; } 1024 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1025 1026 virtual SourceRange getSourceRange() const { 1027 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1028 } 1029 1030 static bool classof(const Stmt *T) { 1031 return T->getStmtClass() == CallExprClass || 1032 T->getStmtClass() == CXXOperatorCallExprClass || 1033 T->getStmtClass() == CXXMemberCallExprClass; 1034 } 1035 static bool classof(const CallExpr *) { return true; } 1036 static bool classof(const CXXOperatorCallExpr *) { return true; } 1037 static bool classof(const CXXMemberCallExpr *) { return true; } 1038 1039 // Iterators 1040 virtual child_iterator child_begin(); 1041 virtual child_iterator child_end(); 1042}; 1043 1044/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1045/// 1046class MemberExpr : public Expr { 1047 /// Base - the expression for the base pointer or structure references. In 1048 /// X.F, this is "X". 1049 Stmt *Base; 1050 1051 /// MemberDecl - This is the decl being referenced by the field/member name. 1052 /// In X.F, this is the decl referenced by F. 1053 NamedDecl *MemberDecl; 1054 1055 /// MemberLoc - This is the location of the member name. 1056 SourceLocation MemberLoc; 1057 1058 /// IsArrow - True if this is "X->F", false if this is "X.F". 1059 bool IsArrow; 1060public: 1061 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1062 QualType ty) 1063 : Expr(MemberExprClass, ty, 1064 base->isTypeDependent(), base->isValueDependent()), 1065 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1066 1067 /// \brief Build an empty member reference expression. 1068 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1069 1070 void setBase(Expr *E) { Base = E; } 1071 Expr *getBase() const { return cast<Expr>(Base); } 1072 1073 /// \brief Retrieve the member declaration to which this expression refers. 1074 /// 1075 /// The returned declaration will either be a FieldDecl or (in C++) 1076 /// a CXXMethodDecl. 1077 NamedDecl *getMemberDecl() const { return MemberDecl; } 1078 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1079 1080 bool isArrow() const { return IsArrow; } 1081 void setArrow(bool A) { IsArrow = A; } 1082 1083 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1084 /// location of 'F'. 1085 SourceLocation getMemberLoc() const { return MemberLoc; } 1086 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1087 1088 virtual SourceRange getSourceRange() const { 1089 // If we have an implicit base (like a C++ implicit this), 1090 // make sure not to return its location 1091 SourceLocation BaseLoc = getBase()->getLocStart(); 1092 if (BaseLoc.isInvalid()) 1093 return SourceRange(MemberLoc, MemberLoc); 1094 return SourceRange(BaseLoc, MemberLoc); 1095 } 1096 1097 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1098 1099 static bool classof(const Stmt *T) { 1100 return T->getStmtClass() == MemberExprClass; 1101 } 1102 static bool classof(const MemberExpr *) { return true; } 1103 1104 // Iterators 1105 virtual child_iterator child_begin(); 1106 virtual child_iterator child_end(); 1107}; 1108 1109/// CompoundLiteralExpr - [C99 6.5.2.5] 1110/// 1111class CompoundLiteralExpr : public Expr { 1112 /// LParenLoc - If non-null, this is the location of the left paren in a 1113 /// compound literal like "(int){4}". This can be null if this is a 1114 /// synthesized compound expression. 1115 SourceLocation LParenLoc; 1116 Stmt *Init; 1117 bool FileScope; 1118public: 1119 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1120 bool fileScope) 1121 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1122 FileScope(fileScope) {} 1123 1124 /// \brief Construct an empty compound literal. 1125 explicit CompoundLiteralExpr(EmptyShell Empty) 1126 : Expr(CompoundLiteralExprClass, Empty) { } 1127 1128 const Expr *getInitializer() const { return cast<Expr>(Init); } 1129 Expr *getInitializer() { return cast<Expr>(Init); } 1130 void setInitializer(Expr *E) { Init = E; } 1131 1132 bool isFileScope() const { return FileScope; } 1133 void setFileScope(bool FS) { FileScope = FS; } 1134 1135 SourceLocation getLParenLoc() const { return LParenLoc; } 1136 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1137 1138 virtual SourceRange getSourceRange() const { 1139 // FIXME: Init should never be null. 1140 if (!Init) 1141 return SourceRange(); 1142 if (LParenLoc.isInvalid()) 1143 return Init->getSourceRange(); 1144 return SourceRange(LParenLoc, Init->getLocEnd()); 1145 } 1146 1147 static bool classof(const Stmt *T) { 1148 return T->getStmtClass() == CompoundLiteralExprClass; 1149 } 1150 static bool classof(const CompoundLiteralExpr *) { return true; } 1151 1152 // Iterators 1153 virtual child_iterator child_begin(); 1154 virtual child_iterator child_end(); 1155}; 1156 1157/// CastExpr - Base class for type casts, including both implicit 1158/// casts (ImplicitCastExpr) and explicit casts that have some 1159/// representation in the source code (ExplicitCastExpr's derived 1160/// classes). 1161class CastExpr : public Expr { 1162public: 1163 /// CastKind - the kind of cast this represents. 1164 enum CastKind { 1165 /// CK_Unknown - Unknown cast kind. 1166 /// FIXME: The goal is to get rid of this and make all casts have a 1167 /// kind so that the AST client doesn't have to try to figure out what's 1168 /// going on. 1169 CK_Unknown, 1170 1171 /// CK_BitCast - Used for reinterpret_cast. 1172 CK_BitCast, 1173 1174 /// CK_NoOp - Used for const_cast. 1175 CK_NoOp, 1176 1177 /// CK_DerivedToBase - Derived to base class casts. 1178 CK_DerivedToBase, 1179 1180 /// CK_Dynamic - Dynamic cast. 1181 CK_Dynamic 1182 }; 1183 1184private: 1185 CastKind Kind; 1186 Stmt *Op; 1187protected: 1188 CastExpr(StmtClass SC, QualType ty, CastKind kind, Expr *op) : 1189 Expr(SC, ty, 1190 // Cast expressions are type-dependent if the type is 1191 // dependent (C++ [temp.dep.expr]p3). 1192 ty->isDependentType(), 1193 // Cast expressions are value-dependent if the type is 1194 // dependent or if the subexpression is value-dependent. 1195 ty->isDependentType() || (op && op->isValueDependent())), 1196 Kind(kind), Op(op) {} 1197 1198 /// \brief Construct an empty cast. 1199 CastExpr(StmtClass SC, EmptyShell Empty) 1200 : Expr(SC, Empty) { } 1201 1202public: 1203 CastKind getCastKind() const { return Kind; } 1204 void setCastKind(CastKind K) { Kind = K; } 1205 1206 Expr *getSubExpr() { return cast<Expr>(Op); } 1207 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1208 void setSubExpr(Expr *E) { Op = E; } 1209 1210 static bool classof(const Stmt *T) { 1211 StmtClass SC = T->getStmtClass(); 1212 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1213 return true; 1214 1215 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1216 return true; 1217 1218 return false; 1219 } 1220 static bool classof(const CastExpr *) { return true; } 1221 1222 // Iterators 1223 virtual child_iterator child_begin(); 1224 virtual child_iterator child_end(); 1225}; 1226 1227/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1228/// conversions, which have no direct representation in the original 1229/// source code. For example: converting T[]->T*, void f()->void 1230/// (*f)(), float->double, short->int, etc. 1231/// 1232/// In C, implicit casts always produce rvalues. However, in C++, an 1233/// implicit cast whose result is being bound to a reference will be 1234/// an lvalue. For example: 1235/// 1236/// @code 1237/// class Base { }; 1238/// class Derived : public Base { }; 1239/// void f(Derived d) { 1240/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1241/// } 1242/// @endcode 1243class ImplicitCastExpr : public CastExpr { 1244 /// LvalueCast - Whether this cast produces an lvalue. 1245 bool LvalueCast; 1246 1247public: 1248 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1249 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1250 1251 /// \brief Construct an empty implicit cast. 1252 explicit ImplicitCastExpr(EmptyShell Shell) 1253 : CastExpr(ImplicitCastExprClass, Shell) { } 1254 1255 1256 virtual SourceRange getSourceRange() const { 1257 return getSubExpr()->getSourceRange(); 1258 } 1259 1260 /// isLvalueCast - Whether this cast produces an lvalue. 1261 bool isLvalueCast() const { return LvalueCast; } 1262 1263 /// setLvalueCast - Set whether this cast produces an lvalue. 1264 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1265 1266 static bool classof(const Stmt *T) { 1267 return T->getStmtClass() == ImplicitCastExprClass; 1268 } 1269 static bool classof(const ImplicitCastExpr *) { return true; } 1270}; 1271 1272/// ExplicitCastExpr - An explicit cast written in the source 1273/// code. 1274/// 1275/// This class is effectively an abstract class, because it provides 1276/// the basic representation of an explicitly-written cast without 1277/// specifying which kind of cast (C cast, functional cast, static 1278/// cast, etc.) was written; specific derived classes represent the 1279/// particular style of cast and its location information. 1280/// 1281/// Unlike implicit casts, explicit cast nodes have two different 1282/// types: the type that was written into the source code, and the 1283/// actual type of the expression as determined by semantic 1284/// analysis. These types may differ slightly. For example, in C++ one 1285/// can cast to a reference type, which indicates that the resulting 1286/// expression will be an lvalue. The reference type, however, will 1287/// not be used as the type of the expression. 1288class ExplicitCastExpr : public CastExpr { 1289 /// TypeAsWritten - The type that this expression is casting to, as 1290 /// written in the source code. 1291 QualType TypeAsWritten; 1292 1293protected: 1294 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, Expr *op, 1295 QualType writtenTy) 1296 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1297 1298 /// \brief Construct an empty explicit cast. 1299 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1300 : CastExpr(SC, Shell) { } 1301 1302public: 1303 /// getTypeAsWritten - Returns the type that this expression is 1304 /// casting to, as written in the source code. 1305 QualType getTypeAsWritten() const { return TypeAsWritten; } 1306 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1307 1308 static bool classof(const Stmt *T) { 1309 StmtClass SC = T->getStmtClass(); 1310 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1311 return true; 1312 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1313 return true; 1314 1315 return false; 1316 } 1317 static bool classof(const ExplicitCastExpr *) { return true; } 1318}; 1319 1320/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1321/// cast in C++ (C++ [expr.cast]), which uses the syntax 1322/// (Type)expr. For example: @c (int)f. 1323class CStyleCastExpr : public ExplicitCastExpr { 1324 SourceLocation LPLoc; // the location of the left paren 1325 SourceLocation RPLoc; // the location of the right paren 1326public: 1327 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1328 SourceLocation l, SourceLocation r) : 1329 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1330 LPLoc(l), RPLoc(r) {} 1331 1332 /// \brief Construct an empty C-style explicit cast. 1333 explicit CStyleCastExpr(EmptyShell Shell) 1334 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1335 1336 SourceLocation getLParenLoc() const { return LPLoc; } 1337 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1338 1339 SourceLocation getRParenLoc() const { return RPLoc; } 1340 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1341 1342 virtual SourceRange getSourceRange() const { 1343 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1344 } 1345 static bool classof(const Stmt *T) { 1346 return T->getStmtClass() == CStyleCastExprClass; 1347 } 1348 static bool classof(const CStyleCastExpr *) { return true; } 1349}; 1350 1351/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1352/// 1353/// This expression node kind describes a builtin binary operation, 1354/// such as "x + y" for integer values "x" and "y". The operands will 1355/// already have been converted to appropriate types (e.g., by 1356/// performing promotions or conversions). 1357/// 1358/// In C++, where operators may be overloaded, a different kind of 1359/// expression node (CXXOperatorCallExpr) is used to express the 1360/// invocation of an overloaded operator with operator syntax. Within 1361/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1362/// used to store an expression "x + y" depends on the subexpressions 1363/// for x and y. If neither x or y is type-dependent, and the "+" 1364/// operator resolves to a built-in operation, BinaryOperator will be 1365/// used to express the computation (x and y may still be 1366/// value-dependent). If either x or y is type-dependent, or if the 1367/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1368/// be used to express the computation. 1369class BinaryOperator : public Expr { 1370public: 1371 enum Opcode { 1372 // Operators listed in order of precedence. 1373 // Note that additions to this should also update the StmtVisitor class. 1374 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1375 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1376 Add, Sub, // [C99 6.5.6] Additive operators. 1377 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1378 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1379 EQ, NE, // [C99 6.5.9] Equality operators. 1380 And, // [C99 6.5.10] Bitwise AND operator. 1381 Xor, // [C99 6.5.11] Bitwise XOR operator. 1382 Or, // [C99 6.5.12] Bitwise OR operator. 1383 LAnd, // [C99 6.5.13] Logical AND operator. 1384 LOr, // [C99 6.5.14] Logical OR operator. 1385 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1386 DivAssign, RemAssign, 1387 AddAssign, SubAssign, 1388 ShlAssign, ShrAssign, 1389 AndAssign, XorAssign, 1390 OrAssign, 1391 Comma // [C99 6.5.17] Comma operator. 1392 }; 1393private: 1394 enum { LHS, RHS, END_EXPR }; 1395 Stmt* SubExprs[END_EXPR]; 1396 Opcode Opc; 1397 SourceLocation OpLoc; 1398public: 1399 1400 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1401 SourceLocation opLoc) 1402 : Expr(BinaryOperatorClass, ResTy, 1403 lhs->isTypeDependent() || rhs->isTypeDependent(), 1404 lhs->isValueDependent() || rhs->isValueDependent()), 1405 Opc(opc), OpLoc(opLoc) { 1406 SubExprs[LHS] = lhs; 1407 SubExprs[RHS] = rhs; 1408 assert(!isCompoundAssignmentOp() && 1409 "Use ArithAssignBinaryOperator for compound assignments"); 1410 } 1411 1412 /// \brief Construct an empty binary operator. 1413 explicit BinaryOperator(EmptyShell Empty) 1414 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1415 1416 SourceLocation getOperatorLoc() const { return OpLoc; } 1417 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1418 1419 Opcode getOpcode() const { return Opc; } 1420 void setOpcode(Opcode O) { Opc = O; } 1421 1422 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1423 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1424 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1425 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1426 1427 virtual SourceRange getSourceRange() const { 1428 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1429 } 1430 1431 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1432 /// corresponds to, e.g. "<<=". 1433 static const char *getOpcodeStr(Opcode Op); 1434 1435 /// \brief Retrieve the binary opcode that corresponds to the given 1436 /// overloaded operator. 1437 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1438 1439 /// \brief Retrieve the overloaded operator kind that corresponds to 1440 /// the given binary opcode. 1441 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1442 1443 /// predicates to categorize the respective opcodes. 1444 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1445 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1446 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1447 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1448 1449 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1450 bool isRelationalOp() const { return isRelationalOp(Opc); } 1451 1452 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1453 bool isEqualityOp() const { return isEqualityOp(Opc); } 1454 1455 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1456 bool isLogicalOp() const { return isLogicalOp(Opc); } 1457 1458 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1459 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1460 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1461 1462 static bool classof(const Stmt *S) { 1463 return S->getStmtClass() == BinaryOperatorClass || 1464 S->getStmtClass() == CompoundAssignOperatorClass; 1465 } 1466 static bool classof(const BinaryOperator *) { return true; } 1467 1468 // Iterators 1469 virtual child_iterator child_begin(); 1470 virtual child_iterator child_end(); 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 1524/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1525/// GNU "missing LHS" extension is in use. 1526/// 1527class ConditionalOperator : public Expr { 1528 enum { COND, LHS, RHS, END_EXPR }; 1529 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1530public: 1531 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1532 : Expr(ConditionalOperatorClass, t, 1533 // FIXME: the type of the conditional operator doesn't 1534 // depend on the type of the conditional, but the standard 1535 // seems to imply that it could. File a bug! 1536 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1537 (cond->isValueDependent() || 1538 (lhs && lhs->isValueDependent()) || 1539 (rhs && rhs->isValueDependent()))) { 1540 SubExprs[COND] = cond; 1541 SubExprs[LHS] = lhs; 1542 SubExprs[RHS] = rhs; 1543 } 1544 1545 /// \brief Build an empty conditional operator. 1546 explicit ConditionalOperator(EmptyShell Empty) 1547 : Expr(ConditionalOperatorClass, Empty) { } 1548 1549 // getCond - Return the expression representing the condition for 1550 // the ?: operator. 1551 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1552 void setCond(Expr *E) { SubExprs[COND] = E; } 1553 1554 // getTrueExpr - Return the subexpression representing the value of the ?: 1555 // expression if the condition evaluates to true. In most cases this value 1556 // will be the same as getLHS() except a GCC extension allows the left 1557 // subexpression to be omitted, and instead of the condition be returned. 1558 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1559 // is only evaluated once. 1560 Expr *getTrueExpr() const { 1561 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1562 } 1563 1564 // getTrueExpr - Return the subexpression representing the value of the ?: 1565 // expression if the condition evaluates to false. This is the same as getRHS. 1566 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1567 1568 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1569 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1570 1571 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1572 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1573 1574 virtual SourceRange getSourceRange() const { 1575 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1576 } 1577 static bool classof(const Stmt *T) { 1578 return T->getStmtClass() == ConditionalOperatorClass; 1579 } 1580 static bool classof(const ConditionalOperator *) { return true; } 1581 1582 // Iterators 1583 virtual child_iterator child_begin(); 1584 virtual child_iterator child_end(); 1585}; 1586 1587/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1588class AddrLabelExpr : public Expr { 1589 SourceLocation AmpAmpLoc, LabelLoc; 1590 LabelStmt *Label; 1591public: 1592 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1593 QualType t) 1594 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1595 1596 /// \brief Build an empty address of a label expression. 1597 explicit AddrLabelExpr(EmptyShell Empty) 1598 : Expr(AddrLabelExprClass, Empty) { } 1599 1600 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1601 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1602 SourceLocation getLabelLoc() const { return LabelLoc; } 1603 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1604 1605 virtual SourceRange getSourceRange() const { 1606 return SourceRange(AmpAmpLoc, LabelLoc); 1607 } 1608 1609 LabelStmt *getLabel() const { return Label; } 1610 void setLabel(LabelStmt *S) { Label = S; } 1611 1612 static bool classof(const Stmt *T) { 1613 return T->getStmtClass() == AddrLabelExprClass; 1614 } 1615 static bool classof(const AddrLabelExpr *) { return true; } 1616 1617 // Iterators 1618 virtual child_iterator child_begin(); 1619 virtual child_iterator child_end(); 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 /// \brief Build an empty statement expression. 1634 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 1635 1636 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1637 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1638 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 1639 1640 virtual SourceRange getSourceRange() const { 1641 return SourceRange(LParenLoc, RParenLoc); 1642 } 1643 1644 SourceLocation getLParenLoc() const { return LParenLoc; } 1645 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1646 SourceLocation getRParenLoc() const { return RParenLoc; } 1647 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1648 1649 static bool classof(const Stmt *T) { 1650 return T->getStmtClass() == StmtExprClass; 1651 } 1652 static bool classof(const StmtExpr *) { return true; } 1653 1654 // Iterators 1655 virtual child_iterator child_begin(); 1656 virtual child_iterator child_end(); 1657}; 1658 1659/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 1660/// This AST node represents a function that returns 1 if two *types* (not 1661/// expressions) are compatible. The result of this built-in function can be 1662/// used in integer constant expressions. 1663class TypesCompatibleExpr : public Expr { 1664 QualType Type1; 1665 QualType Type2; 1666 SourceLocation BuiltinLoc, RParenLoc; 1667public: 1668 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1669 QualType t1, QualType t2, SourceLocation RP) : 1670 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1671 BuiltinLoc(BLoc), RParenLoc(RP) {} 1672 1673 /// \brief Build an empty __builtin_type_compatible_p expression. 1674 explicit TypesCompatibleExpr(EmptyShell Empty) 1675 : Expr(TypesCompatibleExprClass, Empty) { } 1676 1677 QualType getArgType1() const { return Type1; } 1678 void setArgType1(QualType T) { Type1 = T; } 1679 QualType getArgType2() const { return Type2; } 1680 void setArgType2(QualType T) { Type2 = T; } 1681 1682 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1683 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1684 1685 SourceLocation getRParenLoc() const { return RParenLoc; } 1686 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1687 1688 virtual SourceRange getSourceRange() const { 1689 return SourceRange(BuiltinLoc, RParenLoc); 1690 } 1691 static bool classof(const Stmt *T) { 1692 return T->getStmtClass() == TypesCompatibleExprClass; 1693 } 1694 static bool classof(const TypesCompatibleExpr *) { return true; } 1695 1696 // Iterators 1697 virtual child_iterator child_begin(); 1698 virtual child_iterator child_end(); 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 // FIXME: Allocate in ASTContext! 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)->EvaluateAsInt(Ctx).getZExtValue(); 1771 } 1772 1773 // Iterators 1774 virtual child_iterator child_begin(); 1775 virtual child_iterator child_end(); 1776}; 1777 1778/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1779/// This AST node is similar to the conditional operator (?:) in C, with 1780/// the following exceptions: 1781/// - the test expression must be a integer constant expression. 1782/// - the expression returned acts like the chosen subexpression in every 1783/// visible way: the type is the same as that of the chosen subexpression, 1784/// and all predicates (whether it's an l-value, whether it's an integer 1785/// constant expression, etc.) return the same result as for the chosen 1786/// sub-expression. 1787class ChooseExpr : public Expr { 1788 enum { COND, LHS, RHS, END_EXPR }; 1789 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1790 SourceLocation BuiltinLoc, RParenLoc; 1791public: 1792 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1793 SourceLocation RP) 1794 : Expr(ChooseExprClass, t), 1795 BuiltinLoc(BLoc), RParenLoc(RP) { 1796 SubExprs[COND] = cond; 1797 SubExprs[LHS] = lhs; 1798 SubExprs[RHS] = rhs; 1799 } 1800 1801 /// \brief Build an empty __builtin_choose_expr. 1802 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1803 1804 /// isConditionTrue - Return whether the condition is true (i.e. not 1805 /// equal to zero). 1806 bool isConditionTrue(ASTContext &C) const; 1807 1808 /// getChosenSubExpr - Return the subexpression chosen according to the 1809 /// condition. 1810 Expr *getChosenSubExpr(ASTContext &C) const { 1811 return isConditionTrue(C) ? getLHS() : getRHS(); 1812 } 1813 1814 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1815 void setCond(Expr *E) { SubExprs[COND] = E; } 1816 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1817 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1818 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1819 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1820 1821 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1822 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1823 1824 SourceLocation getRParenLoc() const { return RParenLoc; } 1825 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1826 1827 virtual SourceRange getSourceRange() const { 1828 return SourceRange(BuiltinLoc, RParenLoc); 1829 } 1830 static bool classof(const Stmt *T) { 1831 return T->getStmtClass() == ChooseExprClass; 1832 } 1833 static bool classof(const ChooseExpr *) { return true; } 1834 1835 // Iterators 1836 virtual child_iterator child_begin(); 1837 virtual child_iterator child_end(); 1838}; 1839 1840/// GNUNullExpr - Implements the GNU __null extension, which is a name 1841/// for a null pointer constant that has integral type (e.g., int or 1842/// long) and is the same size and alignment as a pointer. The __null 1843/// extension is typically only used by system headers, which define 1844/// NULL as __null in C++ rather than using 0 (which is an integer 1845/// that may not match the size of a pointer). 1846class GNUNullExpr : public Expr { 1847 /// TokenLoc - The location of the __null keyword. 1848 SourceLocation TokenLoc; 1849 1850public: 1851 GNUNullExpr(QualType Ty, SourceLocation Loc) 1852 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1853 1854 /// \brief Build an empty GNU __null expression. 1855 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1856 1857 GNUNullExpr* Clone(ASTContext &C) const; 1858 1859 /// getTokenLocation - The location of the __null token. 1860 SourceLocation getTokenLocation() const { return TokenLoc; } 1861 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1862 1863 virtual SourceRange getSourceRange() const { 1864 return SourceRange(TokenLoc); 1865 } 1866 static bool classof(const Stmt *T) { 1867 return T->getStmtClass() == GNUNullExprClass; 1868 } 1869 static bool classof(const GNUNullExpr *) { return true; } 1870 1871 // Iterators 1872 virtual child_iterator child_begin(); 1873 virtual child_iterator child_end(); 1874}; 1875 1876/// VAArgExpr, used for the builtin function __builtin_va_start. 1877class VAArgExpr : public Expr { 1878 Stmt *Val; 1879 SourceLocation BuiltinLoc, RParenLoc; 1880public: 1881 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1882 : Expr(VAArgExprClass, t), 1883 Val(e), 1884 BuiltinLoc(BLoc), 1885 RParenLoc(RPLoc) { } 1886 1887 /// \brief Create an empty __builtin_va_start expression. 1888 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1889 1890 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1891 Expr *getSubExpr() { return cast<Expr>(Val); } 1892 void setSubExpr(Expr *E) { Val = E; } 1893 1894 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1895 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1896 1897 SourceLocation getRParenLoc() const { return RParenLoc; } 1898 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1899 1900 virtual SourceRange getSourceRange() const { 1901 return SourceRange(BuiltinLoc, RParenLoc); 1902 } 1903 static bool classof(const Stmt *T) { 1904 return T->getStmtClass() == VAArgExprClass; 1905 } 1906 static bool classof(const VAArgExpr *) { return true; } 1907 1908 // Iterators 1909 virtual child_iterator child_begin(); 1910 virtual child_iterator child_end(); 1911}; 1912 1913/// @brief Describes an C or C++ initializer list. 1914/// 1915/// InitListExpr describes an initializer list, which can be used to 1916/// initialize objects of different types, including 1917/// struct/class/union types, arrays, and vectors. For example: 1918/// 1919/// @code 1920/// struct foo x = { 1, { 2, 3 } }; 1921/// @endcode 1922/// 1923/// Prior to semantic analysis, an initializer list will represent the 1924/// initializer list as written by the user, but will have the 1925/// placeholder type "void". This initializer list is called the 1926/// syntactic form of the initializer, and may contain C99 designated 1927/// initializers (represented as DesignatedInitExprs), initializations 1928/// of subobject members without explicit braces, and so on. Clients 1929/// interested in the original syntax of the initializer list should 1930/// use the syntactic form of the initializer list. 1931/// 1932/// After semantic analysis, the initializer list will represent the 1933/// semantic form of the initializer, where the initializations of all 1934/// subobjects are made explicit with nested InitListExpr nodes and 1935/// C99 designators have been eliminated by placing the designated 1936/// initializations into the subobject they initialize. Additionally, 1937/// any "holes" in the initialization, where no initializer has been 1938/// specified for a particular subobject, will be replaced with 1939/// implicitly-generated ImplicitValueInitExpr expressions that 1940/// value-initialize the subobjects. Note, however, that the 1941/// initializer lists may still have fewer initializers than there are 1942/// elements to initialize within the object. 1943/// 1944/// Given the semantic form of the initializer list, one can retrieve 1945/// the original syntactic form of that initializer list (if it 1946/// exists) using getSyntacticForm(). Since many initializer lists 1947/// have the same syntactic and semantic forms, getSyntacticForm() may 1948/// return NULL, indicating that the current initializer list also 1949/// serves as its syntactic form. 1950class InitListExpr : public Expr { 1951 // FIXME: Eliminate this vector in favor of ASTContext allocation 1952 std::vector<Stmt *> InitExprs; 1953 SourceLocation LBraceLoc, RBraceLoc; 1954 1955 /// Contains the initializer list that describes the syntactic form 1956 /// written in the source code. 1957 InitListExpr *SyntacticForm; 1958 1959 /// If this initializer list initializes a union, specifies which 1960 /// field within the union will be initialized. 1961 FieldDecl *UnionFieldInit; 1962 1963 /// Whether this initializer list originally had a GNU array-range 1964 /// designator in it. This is a temporary marker used by CodeGen. 1965 bool HadArrayRangeDesignator; 1966 1967public: 1968 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1969 SourceLocation rbraceloc); 1970 1971 /// \brief Build an empty initializer list. 1972 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1973 1974 unsigned getNumInits() const { return InitExprs.size(); } 1975 1976 const Expr* getInit(unsigned Init) const { 1977 assert(Init < getNumInits() && "Initializer access out of range!"); 1978 return cast_or_null<Expr>(InitExprs[Init]); 1979 } 1980 1981 Expr* getInit(unsigned Init) { 1982 assert(Init < getNumInits() && "Initializer access out of range!"); 1983 return cast_or_null<Expr>(InitExprs[Init]); 1984 } 1985 1986 void setInit(unsigned Init, Expr *expr) { 1987 assert(Init < getNumInits() && "Initializer access out of range!"); 1988 InitExprs[Init] = expr; 1989 } 1990 1991 /// \brief Reserve space for some number of initializers. 1992 void reserveInits(unsigned NumInits); 1993 1994 /// @brief Specify the number of initializers 1995 /// 1996 /// If there are more than @p NumInits initializers, the remaining 1997 /// initializers will be destroyed. If there are fewer than @p 1998 /// NumInits initializers, NULL expressions will be added for the 1999 /// unknown initializers. 2000 void resizeInits(ASTContext &Context, unsigned NumInits); 2001 2002 /// @brief Updates the initializer at index @p Init with the new 2003 /// expression @p expr, and returns the old expression at that 2004 /// location. 2005 /// 2006 /// When @p Init is out of range for this initializer list, the 2007 /// initializer list will be extended with NULL expressions to 2008 /// accomodate the new entry. 2009 Expr *updateInit(unsigned Init, Expr *expr); 2010 2011 /// \brief If this initializes a union, specifies which field in the 2012 /// union to initialize. 2013 /// 2014 /// Typically, this field is the first named field within the 2015 /// union. However, a designated initializer can specify the 2016 /// initialization of a different field within the union. 2017 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2018 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2019 2020 // Explicit InitListExpr's originate from source code (and have valid source 2021 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2022 bool isExplicit() { 2023 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2024 } 2025 2026 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2027 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2028 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2029 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2030 2031 /// @brief Retrieve the initializer list that describes the 2032 /// syntactic form of the initializer. 2033 /// 2034 /// 2035 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2036 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2037 2038 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2039 void sawArrayRangeDesignator(bool ARD = true) { 2040 HadArrayRangeDesignator = ARD; 2041 } 2042 2043 virtual SourceRange getSourceRange() const { 2044 return SourceRange(LBraceLoc, RBraceLoc); 2045 } 2046 static bool classof(const Stmt *T) { 2047 return T->getStmtClass() == InitListExprClass; 2048 } 2049 static bool classof(const InitListExpr *) { return true; } 2050 2051 // Iterators 2052 virtual child_iterator child_begin(); 2053 virtual child_iterator child_end(); 2054 2055 typedef std::vector<Stmt *>::iterator iterator; 2056 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2057 2058 iterator begin() { return InitExprs.begin(); } 2059 iterator end() { return InitExprs.end(); } 2060 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2061 reverse_iterator rend() { return InitExprs.rend(); } 2062}; 2063 2064/// @brief Represents a C99 designated initializer expression. 2065/// 2066/// A designated initializer expression (C99 6.7.8) contains one or 2067/// more designators (which can be field designators, array 2068/// designators, or GNU array-range designators) followed by an 2069/// expression that initializes the field or element(s) that the 2070/// designators refer to. For example, given: 2071/// 2072/// @code 2073/// struct point { 2074/// double x; 2075/// double y; 2076/// }; 2077/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2078/// @endcode 2079/// 2080/// The InitListExpr contains three DesignatedInitExprs, the first of 2081/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2082/// designators, one array designator for @c [2] followed by one field 2083/// designator for @c .y. The initalization expression will be 1.0. 2084class DesignatedInitExpr : public Expr { 2085public: 2086 /// \brief Forward declaration of the Designator class. 2087 class Designator; 2088 2089private: 2090 /// The location of the '=' or ':' prior to the actual initializer 2091 /// expression. 2092 SourceLocation EqualOrColonLoc; 2093 2094 /// Whether this designated initializer used the GNU deprecated 2095 /// syntax rather than the C99 '=' syntax. 2096 bool GNUSyntax : 1; 2097 2098 /// The number of designators in this initializer expression. 2099 unsigned NumDesignators : 15; 2100 2101 /// \brief The designators in this designated initialization 2102 /// expression. 2103 Designator *Designators; 2104 2105 /// The number of subexpressions of this initializer expression, 2106 /// which contains both the initializer and any additional 2107 /// expressions used by array and array-range designators. 2108 unsigned NumSubExprs : 16; 2109 2110 2111 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2112 const Designator *Designators, 2113 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2114 Expr **IndexExprs, unsigned NumIndexExprs, 2115 Expr *Init); 2116 2117 explicit DesignatedInitExpr(unsigned NumSubExprs) 2118 : Expr(DesignatedInitExprClass, EmptyShell()), 2119 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2120 2121protected: 2122 virtual void DoDestroy(ASTContext &C); 2123 2124public: 2125 /// A field designator, e.g., ".x". 2126 struct FieldDesignator { 2127 /// Refers to the field that is being initialized. The low bit 2128 /// of this field determines whether this is actually a pointer 2129 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2130 /// initially constructed, a field designator will store an 2131 /// IdentifierInfo*. After semantic analysis has resolved that 2132 /// name, the field designator will instead store a FieldDecl*. 2133 uintptr_t NameOrField; 2134 2135 /// The location of the '.' in the designated initializer. 2136 unsigned DotLoc; 2137 2138 /// The location of the field name in the designated initializer. 2139 unsigned FieldLoc; 2140 }; 2141 2142 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2143 struct ArrayOrRangeDesignator { 2144 /// Location of the first index expression within the designated 2145 /// initializer expression's list of subexpressions. 2146 unsigned Index; 2147 /// The location of the '[' starting the array range designator. 2148 unsigned LBracketLoc; 2149 /// The location of the ellipsis separating the start and end 2150 /// indices. Only valid for GNU array-range designators. 2151 unsigned EllipsisLoc; 2152 /// The location of the ']' terminating the array range designator. 2153 unsigned RBracketLoc; 2154 }; 2155 2156 /// @brief Represents a single C99 designator. 2157 /// 2158 /// @todo This class is infuriatingly similar to clang::Designator, 2159 /// but minor differences (storing indices vs. storing pointers) 2160 /// keep us from reusing it. Try harder, later, to rectify these 2161 /// differences. 2162 class Designator { 2163 /// @brief The kind of designator this describes. 2164 enum { 2165 FieldDesignator, 2166 ArrayDesignator, 2167 ArrayRangeDesignator 2168 } Kind; 2169 2170 union { 2171 /// A field designator, e.g., ".x". 2172 struct FieldDesignator Field; 2173 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2174 struct ArrayOrRangeDesignator ArrayOrRange; 2175 }; 2176 friend class DesignatedInitExpr; 2177 2178 public: 2179 Designator() {} 2180 2181 /// @brief Initializes a field designator. 2182 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2183 SourceLocation FieldLoc) 2184 : Kind(FieldDesignator) { 2185 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2186 Field.DotLoc = DotLoc.getRawEncoding(); 2187 Field.FieldLoc = FieldLoc.getRawEncoding(); 2188 } 2189 2190 /// @brief Initializes an array designator. 2191 Designator(unsigned Index, SourceLocation LBracketLoc, 2192 SourceLocation RBracketLoc) 2193 : Kind(ArrayDesignator) { 2194 ArrayOrRange.Index = Index; 2195 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2196 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2197 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2198 } 2199 2200 /// @brief Initializes a GNU array-range designator. 2201 Designator(unsigned Index, SourceLocation LBracketLoc, 2202 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2203 : Kind(ArrayRangeDesignator) { 2204 ArrayOrRange.Index = Index; 2205 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2206 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2207 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2208 } 2209 2210 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2211 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2212 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2213 2214 IdentifierInfo * getFieldName(); 2215 2216 FieldDecl *getField() { 2217 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2218 if (Field.NameOrField & 0x01) 2219 return 0; 2220 else 2221 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2222 } 2223 2224 void setField(FieldDecl *FD) { 2225 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2226 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2227 } 2228 2229 SourceLocation getDotLoc() const { 2230 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2231 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2232 } 2233 2234 SourceLocation getFieldLoc() const { 2235 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2236 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2237 } 2238 2239 SourceLocation getLBracketLoc() const { 2240 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2241 "Only valid on an array or array-range designator"); 2242 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2243 } 2244 2245 SourceLocation getRBracketLoc() const { 2246 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2247 "Only valid on an array or array-range designator"); 2248 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2249 } 2250 2251 SourceLocation getEllipsisLoc() const { 2252 assert(Kind == ArrayRangeDesignator && 2253 "Only valid on an array-range designator"); 2254 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2255 } 2256 2257 unsigned getFirstExprIndex() const { 2258 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2259 "Only valid on an array or array-range designator"); 2260 return ArrayOrRange.Index; 2261 } 2262 2263 SourceLocation getStartLocation() const { 2264 if (Kind == FieldDesignator) 2265 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2266 else 2267 return getLBracketLoc(); 2268 } 2269 }; 2270 2271 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2272 unsigned NumDesignators, 2273 Expr **IndexExprs, unsigned NumIndexExprs, 2274 SourceLocation EqualOrColonLoc, 2275 bool GNUSyntax, Expr *Init); 2276 2277 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2278 2279 /// @brief Returns the number of designators in this initializer. 2280 unsigned size() const { return NumDesignators; } 2281 2282 // Iterator access to the designators. 2283 typedef Designator* designators_iterator; 2284 designators_iterator designators_begin() { return Designators; } 2285 designators_iterator designators_end() { 2286 return Designators + NumDesignators; 2287 } 2288 2289 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2290 2291 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2292 2293 Expr *getArrayIndex(const Designator& D); 2294 Expr *getArrayRangeStart(const Designator& D); 2295 Expr *getArrayRangeEnd(const Designator& D); 2296 2297 /// @brief Retrieve the location of the '=' that precedes the 2298 /// initializer value itself, if present. 2299 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2300 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2301 2302 /// @brief Determines whether this designated initializer used the 2303 /// deprecated GNU syntax for designated initializers. 2304 bool usesGNUSyntax() const { return GNUSyntax; } 2305 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2306 2307 /// @brief Retrieve the initializer value. 2308 Expr *getInit() const { 2309 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2310 } 2311 2312 void setInit(Expr *init) { 2313 *child_begin() = init; 2314 } 2315 2316 /// \brief Retrieve the total number of subexpressions in this 2317 /// designated initializer expression, including the actual 2318 /// initialized value and any expressions that occur within array 2319 /// and array-range designators. 2320 unsigned getNumSubExprs() const { return NumSubExprs; } 2321 2322 Expr *getSubExpr(unsigned Idx) { 2323 assert(Idx < NumSubExprs && "Subscript out of range"); 2324 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2325 Ptr += sizeof(DesignatedInitExpr); 2326 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2327 } 2328 2329 void setSubExpr(unsigned Idx, Expr *E) { 2330 assert(Idx < NumSubExprs && "Subscript out of range"); 2331 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2332 Ptr += sizeof(DesignatedInitExpr); 2333 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2334 } 2335 2336 /// \brief Replaces the designator at index @p Idx with the series 2337 /// of designators in [First, Last). 2338 void ExpandDesignator(unsigned Idx, const Designator *First, 2339 const Designator *Last); 2340 2341 virtual SourceRange getSourceRange() const; 2342 2343 static bool classof(const Stmt *T) { 2344 return T->getStmtClass() == DesignatedInitExprClass; 2345 } 2346 static bool classof(const DesignatedInitExpr *) { return true; } 2347 2348 // Iterators 2349 virtual child_iterator child_begin(); 2350 virtual child_iterator child_end(); 2351}; 2352 2353/// \brief Represents an implicitly-generated value initialization of 2354/// an object of a given type. 2355/// 2356/// Implicit value initializations occur within semantic initializer 2357/// list expressions (InitListExpr) as placeholders for subobject 2358/// initializations not explicitly specified by the user. 2359/// 2360/// \see InitListExpr 2361class ImplicitValueInitExpr : public Expr { 2362public: 2363 explicit ImplicitValueInitExpr(QualType ty) 2364 : Expr(ImplicitValueInitExprClass, ty) { } 2365 2366 /// \brief Construct an empty implicit value initialization. 2367 explicit ImplicitValueInitExpr(EmptyShell Empty) 2368 : Expr(ImplicitValueInitExprClass, Empty) { } 2369 2370 static bool classof(const Stmt *T) { 2371 return T->getStmtClass() == ImplicitValueInitExprClass; 2372 } 2373 static bool classof(const ImplicitValueInitExpr *) { return true; } 2374 2375 virtual SourceRange getSourceRange() const { 2376 return SourceRange(); 2377 } 2378 2379 ImplicitValueInitExpr *Clone(ASTContext &C) const; 2380 2381 // Iterators 2382 virtual child_iterator child_begin(); 2383 virtual child_iterator child_end(); 2384}; 2385 2386//===----------------------------------------------------------------------===// 2387// Clang Extensions 2388//===----------------------------------------------------------------------===// 2389 2390 2391/// ExtVectorElementExpr - This represents access to specific elements of a 2392/// vector, and may occur on the left hand side or right hand side. For example 2393/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2394/// 2395/// Note that the base may have either vector or pointer to vector type, just 2396/// like a struct field reference. 2397/// 2398class ExtVectorElementExpr : public Expr { 2399 Stmt *Base; 2400 IdentifierInfo *Accessor; 2401 SourceLocation AccessorLoc; 2402public: 2403 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2404 SourceLocation loc) 2405 : Expr(ExtVectorElementExprClass, ty), 2406 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2407 2408 /// \brief Build an empty vector element expression. 2409 explicit ExtVectorElementExpr(EmptyShell Empty) 2410 : Expr(ExtVectorElementExprClass, Empty) { } 2411 2412 const Expr *getBase() const { return cast<Expr>(Base); } 2413 Expr *getBase() { return cast<Expr>(Base); } 2414 void setBase(Expr *E) { Base = E; } 2415 2416 IdentifierInfo &getAccessor() const { return *Accessor; } 2417 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2418 2419 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2420 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2421 2422 /// getNumElements - Get the number of components being selected. 2423 unsigned getNumElements() const; 2424 2425 /// containsDuplicateElements - Return true if any element access is 2426 /// repeated. 2427 bool containsDuplicateElements() const; 2428 2429 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2430 /// aggregate Constant of ConstantInt(s). 2431 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2432 2433 virtual SourceRange getSourceRange() const { 2434 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2435 } 2436 2437 /// isArrow - Return true if the base expression is a pointer to vector, 2438 /// return false if the base expression is a vector. 2439 bool isArrow() const; 2440 2441 static bool classof(const Stmt *T) { 2442 return T->getStmtClass() == ExtVectorElementExprClass; 2443 } 2444 static bool classof(const ExtVectorElementExpr *) { return true; } 2445 2446 // Iterators 2447 virtual child_iterator child_begin(); 2448 virtual child_iterator child_end(); 2449}; 2450 2451 2452/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2453/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2454class BlockExpr : public Expr { 2455protected: 2456 BlockDecl *TheBlock; 2457 bool HasBlockDeclRefExprs; 2458public: 2459 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2460 : Expr(BlockExprClass, ty), 2461 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2462 2463 /// \brief Build an empty block expression. 2464 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2465 2466 const BlockDecl *getBlockDecl() const { return TheBlock; } 2467 BlockDecl *getBlockDecl() { return TheBlock; } 2468 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2469 2470 // Convenience functions for probing the underlying BlockDecl. 2471 SourceLocation getCaretLocation() const; 2472 const Stmt *getBody() const; 2473 Stmt *getBody(); 2474 2475 virtual SourceRange getSourceRange() const { 2476 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2477 } 2478 2479 /// getFunctionType - Return the underlying function type for this block. 2480 const FunctionType *getFunctionType() const; 2481 2482 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2483 /// inside of the block that reference values outside the block. 2484 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2485 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2486 2487 static bool classof(const Stmt *T) { 2488 return T->getStmtClass() == BlockExprClass; 2489 } 2490 static bool classof(const BlockExpr *) { return true; } 2491 2492 // Iterators 2493 virtual child_iterator child_begin(); 2494 virtual child_iterator child_end(); 2495}; 2496 2497/// BlockDeclRefExpr - A reference to a declared variable, function, 2498/// enum, etc. 2499class BlockDeclRefExpr : public Expr { 2500 ValueDecl *D; 2501 SourceLocation Loc; 2502 bool IsByRef : 1; 2503 bool ConstQualAdded : 1; 2504public: 2505 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2506 bool constAdded = false) : 2507 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2508 ConstQualAdded(constAdded) {} 2509 2510 // \brief Build an empty reference to a declared variable in a 2511 // block. 2512 explicit BlockDeclRefExpr(EmptyShell Empty) 2513 : Expr(BlockDeclRefExprClass, Empty) { } 2514 2515 ValueDecl *getDecl() { return D; } 2516 const ValueDecl *getDecl() const { return D; } 2517 void setDecl(ValueDecl *VD) { D = VD; } 2518 2519 SourceLocation getLocation() const { return Loc; } 2520 void setLocation(SourceLocation L) { Loc = L; } 2521 2522 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2523 2524 bool isByRef() const { return IsByRef; } 2525 void setByRef(bool BR) { IsByRef = BR; } 2526 2527 bool isConstQualAdded() const { return ConstQualAdded; } 2528 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2529 2530 static bool classof(const Stmt *T) { 2531 return T->getStmtClass() == BlockDeclRefExprClass; 2532 } 2533 static bool classof(const BlockDeclRefExpr *) { return true; } 2534 2535 // Iterators 2536 virtual child_iterator child_begin(); 2537 virtual child_iterator child_end(); 2538}; 2539 2540} // end namespace clang 2541 2542#endif 2543