Expr.h revision d8ac436c8c10c52c937ba323db582259ceb06197
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66 /// \brief Construct an empty expression. 67 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 68 69public: 70 QualType getType() const { return TR; } 71 void setType(QualType t) { 72 // In C++, the type of an expression is always adjusted so that it 73 // will not have reference type an expression will never have 74 // reference type (C++ [expr]p6). Use 75 // QualType::getNonReferenceType() to retrieve the non-reference 76 // type. Additionally, inspect Expr::isLvalue to determine whether 77 // an expression that is adjusted in this manner should be 78 // considered an lvalue. 79 assert((TR.isNull() || !TR->isReferenceType()) && 80 "Expressions can't have reference type"); 81 82 TR = t; 83 } 84 85 /// isValueDependent - Determines whether this expression is 86 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 87 /// array bound of "Chars" in the following example is 88 /// value-dependent. 89 /// @code 90 /// template<int Size, char (&Chars)[Size]> struct meta_string; 91 /// @endcode 92 bool isValueDependent() const { return ValueDependent; } 93 94 /// \brief Set whether this expression is value-dependent or not. 95 void setValueDependent(bool VD) { ValueDependent = VD; } 96 97 /// isTypeDependent - Determines whether this expression is 98 /// type-dependent (C++ [temp.dep.expr]), which means that its type 99 /// could change from one template instantiation to the next. For 100 /// example, the expressions "x" and "x + y" are type-dependent in 101 /// the following code, but "y" is not type-dependent: 102 /// @code 103 /// template<typename T> 104 /// void add(T x, int y) { 105 /// x + y; 106 /// } 107 /// @endcode 108 bool isTypeDependent() const { return TypeDependent; } 109 110 /// \brief Set whether this expression is type-dependent or not. 111 void setTypeDependent(bool TD) { TypeDependent = TD; } 112 113 /// SourceLocation tokens are not useful in isolation - they are low level 114 /// value objects created/interpreted by SourceManager. We assume AST 115 /// clients will have a pointer to the respective SourceManager. 116 virtual SourceRange getSourceRange() const = 0; 117 118 /// getExprLoc - Return the preferred location for the arrow when diagnosing 119 /// a problem with a generic expression. 120 virtual SourceLocation getExprLoc() const { return getLocStart(); } 121 122 /// isUnusedResultAWarning - Return true if this immediate expression should 123 /// be warned about if the result is unused. If so, fill in Loc and Ranges 124 /// with location to warn on and the source range[s] to report with the 125 /// warning. 126 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 127 SourceRange &R2) const; 128 129 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 130 /// incomplete type other than void. Nonarray expressions that can be lvalues: 131 /// - name, where name must be a variable 132 /// - e[i] 133 /// - (e), where e must be an lvalue 134 /// - e.name, where e must be an lvalue 135 /// - e->name 136 /// - *e, the type of e cannot be a function type 137 /// - string-constant 138 /// - reference type [C++ [expr]] 139 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 140 /// 141 enum isLvalueResult { 142 LV_Valid, 143 LV_NotObjectType, 144 LV_IncompleteVoidType, 145 LV_DuplicateVectorComponents, 146 LV_InvalidExpression, 147 LV_MemberFunction 148 }; 149 isLvalueResult isLvalue(ASTContext &Ctx) const; 150 151 // 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 /// isIntegerConstantExpr - Return true if this expression is a valid integer 186 /// constant expression, and, if so, return its value in Result. If not a 187 /// valid i-c-e, return false and fill in Loc (if specified) with the location 188 /// of the invalid expression. 189 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 190 SourceLocation *Loc = 0, 191 bool isEvaluated = true) const; 192 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 193 llvm::APSInt X; 194 return isIntegerConstantExpr(X, Ctx, Loc); 195 } 196 /// isConstantInitializer - Returns true if this expression is a constant 197 /// initializer, which can be emitted at compile-time. 198 bool isConstantInitializer(ASTContext &Ctx) const; 199 200 /// EvalResult is a struct with detailed info about an evaluated expression. 201 struct EvalResult { 202 /// Val - This is the value the expression can be folded to. 203 APValue Val; 204 205 /// HasSideEffects - Whether the evaluated expression has side effects. 206 /// For example, (f() && 0) can be folded, but it still has side effects. 207 bool HasSideEffects; 208 209 /// Diag - If the expression is unfoldable, then Diag contains a note 210 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 211 /// position for the error, and DiagExpr is the expression that caused 212 /// the error. 213 /// If the expression is foldable, but not an integer constant expression, 214 /// Diag contains a note diagnostic that describes why it isn't an integer 215 /// constant expression. If the expression *is* an integer constant 216 /// expression, then Diag will be zero. 217 unsigned Diag; 218 const Expr *DiagExpr; 219 SourceLocation DiagLoc; 220 221 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 222 }; 223 224 /// Evaluate - Return true if this is a constant which we can fold using 225 /// any crazy technique (that has nothing to do with language standards) that 226 /// we want to. If this function returns true, it returns the folded constant 227 /// in Result. 228 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 229 230 /// isEvaluatable - Call Evaluate to see if this expression can be constant 231 /// folded, but discard the result. 232 bool isEvaluatable(ASTContext &Ctx) const; 233 234 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 235 /// must be called on an expression that constant folds to an integer. 236 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 237 238 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 239 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 240 241 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 242 /// integer constant expression with the value zero, or if this is one that is 243 /// cast to void*. 244 bool isNullPointerConstant(ASTContext &Ctx) const; 245 246 /// hasGlobalStorage - Return true if this expression has static storage 247 /// duration. This means that the address of this expression is a link-time 248 /// constant. 249 bool hasGlobalStorage() const; 250 251 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 252 /// write barrier. 253 bool isOBJCGCCandidate() const; 254 255 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 256 /// its subexpression. If that subexpression is also a ParenExpr, 257 /// then this method recursively returns its subexpression, and so forth. 258 /// Otherwise, the method returns the current Expr. 259 Expr* IgnoreParens(); 260 261 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 262 /// or CastExprs, returning their operand. 263 Expr *IgnoreParenCasts(); 264 265 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 266 /// value (including ptr->int casts of the same size). Strip off any 267 /// ParenExpr or CastExprs, returning their operand. 268 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 269 270 const Expr* IgnoreParens() const { 271 return const_cast<Expr*>(this)->IgnoreParens(); 272 } 273 const Expr *IgnoreParenCasts() const { 274 return const_cast<Expr*>(this)->IgnoreParenCasts(); 275 } 276 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 277 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 278 } 279 280 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 281 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 282 283 static bool classof(const Stmt *T) { 284 return T->getStmtClass() >= firstExprConstant && 285 T->getStmtClass() <= lastExprConstant; 286 } 287 static bool classof(const Expr *) { return true; } 288}; 289 290 291//===----------------------------------------------------------------------===// 292// Primary Expressions. 293//===----------------------------------------------------------------------===// 294 295/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 296/// enum, etc. 297class DeclRefExpr : public Expr { 298 NamedDecl *D; 299 SourceLocation Loc; 300 301protected: 302 // FIXME: Eventually, this constructor will go away and all subclasses 303 // will have to provide the type- and value-dependent flags. 304 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 305 Expr(SC, t), D(d), Loc(l) {} 306 307 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 308 bool VD) : 309 Expr(SC, t, TD, VD), D(d), Loc(l) {} 310 311public: 312 // FIXME: Eventually, this constructor will go away and all clients 313 // will have to provide the type- and value-dependent flags. 314 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 315 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 316 317 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 318 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 319 320 /// \brief Construct an empty declaration reference expression. 321 explicit DeclRefExpr(EmptyShell Empty) 322 : Expr(DeclRefExprClass, Empty) { } 323 324 NamedDecl *getDecl() { return D; } 325 const NamedDecl *getDecl() const { return D; } 326 void setDecl(NamedDecl *NewD) { D = NewD; } 327 328 SourceLocation getLocation() const { return Loc; } 329 void setLocation(SourceLocation L) { Loc = L; } 330 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 331 332 static bool classof(const Stmt *T) { 333 return T->getStmtClass() == DeclRefExprClass || 334 T->getStmtClass() == CXXConditionDeclExprClass || 335 T->getStmtClass() == QualifiedDeclRefExprClass; 336 } 337 static bool classof(const DeclRefExpr *) { return true; } 338 339 // Iterators 340 virtual child_iterator child_begin(); 341 virtual child_iterator child_end(); 342}; 343 344/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 345class PredefinedExpr : public Expr { 346public: 347 enum IdentType { 348 Func, 349 Function, 350 PrettyFunction 351 }; 352 353private: 354 SourceLocation Loc; 355 IdentType Type; 356public: 357 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 358 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 359 360 /// \brief Construct an empty predefined expression. 361 explicit PredefinedExpr(EmptyShell Empty) 362 : Expr(PredefinedExprClass, Empty) { } 363 364 PredefinedExpr* Clone(ASTContext &C) const; 365 366 IdentType getIdentType() const { return Type; } 367 void setIdentType(IdentType IT) { Type = IT; } 368 369 SourceLocation getLocation() const { return Loc; } 370 void setLocation(SourceLocation L) { Loc = L; } 371 372 // FIXME: The logic for computing the value of a predefined expr should go 373 // into a method here that takes the inner-most code decl (a block, function 374 // or objc method) that the expr lives in. This would allow sema and codegen 375 // to be consistent for things like sizeof(__func__) etc. 376 377 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 378 379 static bool classof(const Stmt *T) { 380 return T->getStmtClass() == PredefinedExprClass; 381 } 382 static bool classof(const PredefinedExpr *) { return true; } 383 384 // Iterators 385 virtual child_iterator child_begin(); 386 virtual child_iterator child_end(); 387}; 388 389class IntegerLiteral : public Expr { 390 llvm::APInt Value; 391 SourceLocation Loc; 392public: 393 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 394 // or UnsignedLongLongTy 395 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 396 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 397 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 398 } 399 400 /// \brief Construct an empty integer literal. 401 explicit IntegerLiteral(EmptyShell Empty) 402 : Expr(IntegerLiteralClass, Empty) { } 403 404 IntegerLiteral* Clone(ASTContext &C) const; 405 406 const llvm::APInt &getValue() const { return Value; } 407 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 408 409 /// \brief Retrieve the location of the literal. 410 SourceLocation getLocation() const { return Loc; } 411 412 void setValue(const llvm::APInt &Val) { Value = Val; } 413 void setLocation(SourceLocation Location) { Loc = Location; } 414 415 static bool classof(const Stmt *T) { 416 return T->getStmtClass() == IntegerLiteralClass; 417 } 418 static bool classof(const IntegerLiteral *) { return true; } 419 420 // Iterators 421 virtual child_iterator child_begin(); 422 virtual child_iterator child_end(); 423}; 424 425class CharacterLiteral : public Expr { 426 unsigned Value; 427 SourceLocation Loc; 428 bool IsWide; 429public: 430 // type should be IntTy 431 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 432 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 433 } 434 435 /// \brief Construct an empty character literal. 436 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 437 438 CharacterLiteral* Clone(ASTContext &C) const; 439 440 SourceLocation getLoc() const { return Loc; } 441 bool isWide() const { return IsWide; } 442 443 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 444 445 unsigned getValue() const { return Value; } 446 447 void setLocation(SourceLocation Location) { Loc = Location; } 448 void setWide(bool W) { IsWide = W; } 449 void setValue(unsigned Val) { Value = Val; } 450 451 static bool classof(const Stmt *T) { 452 return T->getStmtClass() == CharacterLiteralClass; 453 } 454 static bool classof(const CharacterLiteral *) { return true; } 455 456 // Iterators 457 virtual child_iterator child_begin(); 458 virtual child_iterator child_end(); 459}; 460 461class FloatingLiteral : public Expr { 462 llvm::APFloat Value; 463 bool IsExact : 1; 464 SourceLocation Loc; 465public: 466 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 467 QualType Type, SourceLocation L) 468 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 469 470 /// \brief Construct an empty floating-point literal. 471 explicit FloatingLiteral(EmptyShell Empty) 472 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 473 474 FloatingLiteral* Clone(ASTContext &C) const; 475 476 const llvm::APFloat &getValue() const { return Value; } 477 void setValue(const llvm::APFloat &Val) { Value = Val; } 478 479 bool isExact() const { return IsExact; } 480 void setExact(bool E) { IsExact = E; } 481 482 /// getValueAsApproximateDouble - This returns the value as an inaccurate 483 /// double. Note that this may cause loss of precision, but is useful for 484 /// debugging dumps, etc. 485 double getValueAsApproximateDouble() const; 486 487 SourceLocation getLocation() const { return Loc; } 488 void setLocation(SourceLocation L) { Loc = L; } 489 490 // FIXME: The logic for computing the value of a predefined expr should go 491 // into a method here that takes the inner-most code decl (a block, function 492 // or objc method) that the expr lives in. This would allow sema and codegen 493 // to be consistent for things like sizeof(__func__) etc. 494 495 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 496 497 static bool classof(const Stmt *T) { 498 return T->getStmtClass() == FloatingLiteralClass; 499 } 500 static bool classof(const FloatingLiteral *) { return true; } 501 502 // Iterators 503 virtual child_iterator child_begin(); 504 virtual child_iterator child_end(); 505}; 506 507/// ImaginaryLiteral - We support imaginary integer and floating point literals, 508/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 509/// IntegerLiteral classes. Instances of this class always have a Complex type 510/// whose element type matches the subexpression. 511/// 512class ImaginaryLiteral : public Expr { 513 Stmt *Val; 514public: 515 ImaginaryLiteral(Expr *val, QualType Ty) 516 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 517 518 /// \brief Build an empty imaginary literal. 519 explicit ImaginaryLiteral(EmptyShell Empty) 520 : Expr(ImaginaryLiteralClass, Empty) { } 521 522 const Expr *getSubExpr() const { return cast<Expr>(Val); } 523 Expr *getSubExpr() { return cast<Expr>(Val); } 524 void setSubExpr(Expr *E) { Val = E; } 525 526 ImaginaryLiteral* Clone(ASTContext &C) const; 527 528 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 529 static bool classof(const Stmt *T) { 530 return T->getStmtClass() == ImaginaryLiteralClass; 531 } 532 static bool classof(const ImaginaryLiteral *) { return true; } 533 534 // Iterators 535 virtual child_iterator child_begin(); 536 virtual child_iterator child_end(); 537}; 538 539/// StringLiteral - This represents a string literal expression, e.g. "foo" 540/// or L"bar" (wide strings). The actual string is returned by getStrData() 541/// is NOT null-terminated, and the length of the string is determined by 542/// calling getByteLength(). The C type for a string is always a 543/// ConstantArrayType. In C++, the char type is const qualified, in C it is 544/// not. 545/// 546/// Note that strings in C can be formed by concatenation of multiple string 547/// literal pptokens in translation phase #6. This keeps track of the locations 548/// of each of these pieces. 549/// 550/// Strings in C can also be truncated and extended by assigning into arrays, 551/// e.g. with constructs like: 552/// char X[2] = "foobar"; 553/// In this case, getByteLength() will return 6, but the string literal will 554/// have type "char[2]". 555class StringLiteral : public Expr { 556 const char *StrData; 557 unsigned ByteLength; 558 bool IsWide; 559 unsigned NumConcatenated; 560 SourceLocation TokLocs[1]; 561 562 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 563public: 564 /// This is the "fully general" constructor that allows representation of 565 /// strings formed from multiple concatenated tokens. 566 static StringLiteral *Create(ASTContext &C, const char *StrData, 567 unsigned ByteLength, bool Wide, QualType Ty, 568 const SourceLocation *Loc, unsigned NumStrs); 569 570 /// Simple constructor for string literals made from one token. 571 static StringLiteral *Create(ASTContext &C, const char *StrData, 572 unsigned ByteLength, 573 bool Wide, QualType Ty, SourceLocation Loc) { 574 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 575 } 576 577 /// \brief Construct an empty string literal. 578 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 579 580 StringLiteral* Clone(ASTContext &C) const; 581 void Destroy(ASTContext &C); 582 583 const char *getStrData() const { return StrData; } 584 unsigned getByteLength() const { return ByteLength; } 585 586 /// \brief Sets the string data to the given string data. 587 void setStrData(ASTContext &C, const char *Str, unsigned Len); 588 589 bool isWide() const { return IsWide; } 590 void setWide(bool W) { IsWide = W; } 591 592 bool containsNonAsciiOrNull() const { 593 for (unsigned i = 0; i < getByteLength(); ++i) 594 if (!isascii(getStrData()[i]) || !getStrData()[i]) 595 return true; 596 return false; 597 } 598 /// getNumConcatenated - Get the number of string literal tokens that were 599 /// concatenated in translation phase #6 to form this string literal. 600 unsigned getNumConcatenated() const { return NumConcatenated; } 601 602 SourceLocation getStrTokenLoc(unsigned TokNum) const { 603 assert(TokNum < NumConcatenated && "Invalid tok number"); 604 return TokLocs[TokNum]; 605 } 606 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 607 assert(TokNum < NumConcatenated && "Invalid tok number"); 608 TokLocs[TokNum] = L; 609 } 610 611 typedef const SourceLocation *tokloc_iterator; 612 tokloc_iterator tokloc_begin() const { return TokLocs; } 613 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 614 615 virtual SourceRange getSourceRange() const { 616 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 617 } 618 static bool classof(const Stmt *T) { 619 return T->getStmtClass() == StringLiteralClass; 620 } 621 static bool classof(const StringLiteral *) { return true; } 622 623 // Iterators 624 virtual child_iterator child_begin(); 625 virtual child_iterator child_end(); 626}; 627 628/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 629/// AST node is only formed if full location information is requested. 630class ParenExpr : public Expr { 631 SourceLocation L, R; 632 Stmt *Val; 633public: 634 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 635 : Expr(ParenExprClass, val->getType(), 636 val->isTypeDependent(), val->isValueDependent()), 637 L(l), R(r), Val(val) {} 638 639 /// \brief Construct an empty parenthesized expression. 640 explicit ParenExpr(EmptyShell Empty) 641 : Expr(ParenExprClass, Empty) { } 642 643 const Expr *getSubExpr() const { return cast<Expr>(Val); } 644 Expr *getSubExpr() { return cast<Expr>(Val); } 645 void setSubExpr(Expr *E) { Val = E; } 646 647 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 648 649 /// \brief Get the location of the left parentheses '('. 650 SourceLocation getLParen() const { return L; } 651 void setLParen(SourceLocation Loc) { L = Loc; } 652 653 /// \brief Get the location of the right parentheses ')'. 654 SourceLocation getRParen() const { return R; } 655 void setRParen(SourceLocation Loc) { R = Loc; } 656 657 static bool classof(const Stmt *T) { 658 return T->getStmtClass() == ParenExprClass; 659 } 660 static bool classof(const ParenExpr *) { return true; } 661 662 // Iterators 663 virtual child_iterator child_begin(); 664 virtual child_iterator child_end(); 665}; 666 667 668/// UnaryOperator - This represents the unary-expression's (except sizeof and 669/// alignof), the postinc/postdec operators from postfix-expression, and various 670/// extensions. 671/// 672/// Notes on various nodes: 673/// 674/// Real/Imag - These return the real/imag part of a complex operand. If 675/// applied to a non-complex value, the former returns its operand and the 676/// later returns zero in the type of the operand. 677/// 678/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 679/// subexpression is a compound literal with the various MemberExpr and 680/// ArraySubscriptExpr's applied to it. 681/// 682class UnaryOperator : public Expr { 683public: 684 // Note that additions to this should also update the StmtVisitor class. 685 enum Opcode { 686 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 687 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 688 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 689 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 690 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 691 Real, Imag, // "__real expr"/"__imag expr" Extension. 692 Extension, // __extension__ marker. 693 OffsetOf // __builtin_offsetof 694 }; 695private: 696 Stmt *Val; 697 Opcode Opc; 698 SourceLocation Loc; 699public: 700 701 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 702 : Expr(UnaryOperatorClass, type, 703 input->isTypeDependent() && opc != OffsetOf, 704 input->isValueDependent()), 705 Val(input), Opc(opc), Loc(l) {} 706 707 /// \brief Build an empty unary operator. 708 explicit UnaryOperator(EmptyShell Empty) 709 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 710 711 Opcode getOpcode() const { return Opc; } 712 void setOpcode(Opcode O) { Opc = O; } 713 714 Expr *getSubExpr() const { return cast<Expr>(Val); } 715 void setSubExpr(Expr *E) { Val = E; } 716 717 /// getOperatorLoc - Return the location of the operator. 718 SourceLocation getOperatorLoc() const { return Loc; } 719 void setOperatorLoc(SourceLocation L) { Loc = L; } 720 721 /// isPostfix - Return true if this is a postfix operation, like x++. 722 static bool isPostfix(Opcode Op) { 723 return Op == PostInc || Op == PostDec; 724 } 725 726 /// isPostfix - Return true if this is a prefix operation, like --x. 727 static bool isPrefix(Opcode Op) { 728 return Op == PreInc || Op == PreDec; 729 } 730 731 bool isPrefix() const { return isPrefix(Opc); } 732 bool isPostfix() const { return isPostfix(Opc); } 733 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 734 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 735 bool isOffsetOfOp() const { return Opc == OffsetOf; } 736 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 737 738 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 739 /// corresponds to, e.g. "sizeof" or "[pre]++" 740 static const char *getOpcodeStr(Opcode Op); 741 742 /// \brief Retrieve the unary opcode that corresponds to the given 743 /// overloaded operator. 744 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 745 746 /// \brief Retrieve the overloaded operator kind that corresponds to 747 /// the given unary opcode. 748 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 749 750 virtual SourceRange getSourceRange() const { 751 if (isPostfix()) 752 return SourceRange(Val->getLocStart(), Loc); 753 else 754 return SourceRange(Loc, Val->getLocEnd()); 755 } 756 virtual SourceLocation getExprLoc() const { return Loc; } 757 758 static bool classof(const Stmt *T) { 759 return T->getStmtClass() == UnaryOperatorClass; 760 } 761 static bool classof(const UnaryOperator *) { return true; } 762 763 // Iterators 764 virtual child_iterator child_begin(); 765 virtual child_iterator child_end(); 766}; 767 768/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 769/// types and expressions. 770class SizeOfAlignOfExpr : public Expr { 771 bool isSizeof : 1; // true if sizeof, false if alignof. 772 bool isType : 1; // true if operand is a type, false if an expression 773 union { 774 void *Ty; 775 Stmt *Ex; 776 } Argument; 777 SourceLocation OpLoc, RParenLoc; 778public: 779 SizeOfAlignOfExpr(bool issizeof, QualType T, 780 QualType resultType, SourceLocation op, 781 SourceLocation rp) : 782 Expr(SizeOfAlignOfExprClass, resultType, 783 false, // Never type-dependent (C++ [temp.dep.expr]p3). 784 // Value-dependent if the argument is type-dependent. 785 T->isDependentType()), 786 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 787 Argument.Ty = T.getAsOpaquePtr(); 788 } 789 790 SizeOfAlignOfExpr(bool issizeof, Expr *E, 791 QualType resultType, SourceLocation op, 792 SourceLocation rp) : 793 Expr(SizeOfAlignOfExprClass, resultType, 794 false, // Never type-dependent (C++ [temp.dep.expr]p3). 795 // Value-dependent if the argument is type-dependent. 796 E->isTypeDependent()), 797 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 798 Argument.Ex = E; 799 } 800 801 /// \brief Construct an empty sizeof/alignof expression. 802 explicit SizeOfAlignOfExpr(EmptyShell Empty) 803 : Expr(SizeOfAlignOfExprClass, Empty) { } 804 805 virtual void Destroy(ASTContext& C); 806 807 bool isSizeOf() const { return isSizeof; } 808 void setSizeof(bool S) { isSizeof = S; } 809 810 bool isArgumentType() const { return isType; } 811 QualType getArgumentType() const { 812 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 813 return QualType::getFromOpaquePtr(Argument.Ty); 814 } 815 Expr *getArgumentExpr() { 816 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 817 return static_cast<Expr*>(Argument.Ex); 818 } 819 const Expr *getArgumentExpr() const { 820 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 821 } 822 823 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 824 void setArgument(QualType T) { 825 Argument.Ty = T.getAsOpaquePtr(); 826 isType = true; 827 } 828 829 /// Gets the argument type, or the type of the argument expression, whichever 830 /// is appropriate. 831 QualType getTypeOfArgument() const { 832 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 833 } 834 835 SourceLocation getOperatorLoc() const { return OpLoc; } 836 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 837 838 SourceLocation getRParenLoc() const { return RParenLoc; } 839 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 840 841 virtual SourceRange getSourceRange() const { 842 return SourceRange(OpLoc, RParenLoc); 843 } 844 845 static bool classof(const Stmt *T) { 846 return T->getStmtClass() == SizeOfAlignOfExprClass; 847 } 848 static bool classof(const SizeOfAlignOfExpr *) { return true; } 849 850 // Iterators 851 virtual child_iterator child_begin(); 852 virtual child_iterator child_end(); 853}; 854 855//===----------------------------------------------------------------------===// 856// Postfix Operators. 857//===----------------------------------------------------------------------===// 858 859/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 860class ArraySubscriptExpr : public Expr { 861 enum { LHS, RHS, END_EXPR=2 }; 862 Stmt* SubExprs[END_EXPR]; 863 SourceLocation RBracketLoc; 864public: 865 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 866 SourceLocation rbracketloc) 867 : Expr(ArraySubscriptExprClass, t, 868 lhs->isTypeDependent() || rhs->isTypeDependent(), 869 lhs->isValueDependent() || rhs->isValueDependent()), 870 RBracketLoc(rbracketloc) { 871 SubExprs[LHS] = lhs; 872 SubExprs[RHS] = rhs; 873 } 874 875 /// \brief Create an empty array subscript expression. 876 explicit ArraySubscriptExpr(EmptyShell Shell) 877 : Expr(ArraySubscriptExprClass, Shell) { } 878 879 /// An array access can be written A[4] or 4[A] (both are equivalent). 880 /// - getBase() and getIdx() always present the normalized view: A[4]. 881 /// In this case getBase() returns "A" and getIdx() returns "4". 882 /// - getLHS() and getRHS() present the syntactic view. e.g. for 883 /// 4[A] getLHS() returns "4". 884 /// Note: Because vector element access is also written A[4] we must 885 /// predicate the format conversion in getBase and getIdx only on the 886 /// the type of the RHS, as it is possible for the LHS to be a vector of 887 /// integer type 888 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 889 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 890 void setLHS(Expr *E) { SubExprs[LHS] = E; } 891 892 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 893 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 894 void setRHS(Expr *E) { SubExprs[RHS] = E; } 895 896 Expr *getBase() { 897 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 898 } 899 900 const Expr *getBase() const { 901 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 902 } 903 904 Expr *getIdx() { 905 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 906 } 907 908 const Expr *getIdx() const { 909 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 910 } 911 912 virtual SourceRange getSourceRange() const { 913 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 914 } 915 916 SourceLocation getRBracketLoc() const { return RBracketLoc; } 917 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 918 919 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 920 921 static bool classof(const Stmt *T) { 922 return T->getStmtClass() == ArraySubscriptExprClass; 923 } 924 static bool classof(const ArraySubscriptExpr *) { return true; } 925 926 // Iterators 927 virtual child_iterator child_begin(); 928 virtual child_iterator child_end(); 929}; 930 931 932/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 933/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 934/// while its subclasses may represent alternative syntax that (semantically) 935/// results in a function call. For example, CXXOperatorCallExpr is 936/// a subclass for overloaded operator calls that use operator syntax, e.g., 937/// "str1 + str2" to resolve to a function call. 938class CallExpr : public Expr { 939 enum { FN=0, ARGS_START=1 }; 940 Stmt **SubExprs; 941 unsigned NumArgs; 942 SourceLocation RParenLoc; 943 944 // This version of the ctor is for deserialization. 945 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 946 SourceLocation rparenloc) 947 : Expr(SC,t), SubExprs(subexprs), 948 NumArgs(numargs), RParenLoc(rparenloc) {} 949 950protected: 951 // This version of the constructor is for derived classes. 952 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 953 QualType t, SourceLocation rparenloc); 954 955public: 956 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 957 SourceLocation rparenloc); 958 959 /// \brief Build an empty call expression. 960 CallExpr(ASTContext &C, EmptyShell Empty); 961 962 ~CallExpr() {} 963 964 void Destroy(ASTContext& C); 965 966 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 967 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 968 void setCallee(Expr *F) { SubExprs[FN] = F; } 969 970 /// getNumArgs - Return the number of actual arguments to this call. 971 /// 972 unsigned getNumArgs() const { return NumArgs; } 973 974 /// getArg - Return the specified argument. 975 Expr *getArg(unsigned Arg) { 976 assert(Arg < NumArgs && "Arg access out of range!"); 977 return cast<Expr>(SubExprs[Arg+ARGS_START]); 978 } 979 const Expr *getArg(unsigned Arg) const { 980 assert(Arg < NumArgs && "Arg access out of range!"); 981 return cast<Expr>(SubExprs[Arg+ARGS_START]); 982 } 983 984 /// setArg - Set the specified argument. 985 void setArg(unsigned Arg, Expr *ArgExpr) { 986 assert(Arg < NumArgs && "Arg access out of range!"); 987 SubExprs[Arg+ARGS_START] = ArgExpr; 988 } 989 990 /// setNumArgs - This changes the number of arguments present in this call. 991 /// Any orphaned expressions are deleted by this, and any new operands are set 992 /// to null. 993 void setNumArgs(ASTContext& C, unsigned NumArgs); 994 995 typedef ExprIterator arg_iterator; 996 typedef ConstExprIterator const_arg_iterator; 997 998 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 999 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1000 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1001 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1002 1003 /// getNumCommas - Return the number of commas that must have been present in 1004 /// this function call. 1005 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1006 1007 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1008 /// not, return 0. 1009 unsigned isBuiltinCall(ASTContext &Context) const; 1010 1011 SourceLocation getRParenLoc() const { return RParenLoc; } 1012 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1013 1014 virtual SourceRange getSourceRange() const { 1015 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1016 } 1017 1018 static bool classof(const Stmt *T) { 1019 return T->getStmtClass() == CallExprClass || 1020 T->getStmtClass() == CXXOperatorCallExprClass || 1021 T->getStmtClass() == CXXMemberCallExprClass; 1022 } 1023 static bool classof(const CallExpr *) { return true; } 1024 static bool classof(const CXXOperatorCallExpr *) { return true; } 1025 static bool classof(const CXXMemberCallExpr *) { return true; } 1026 1027 // Iterators 1028 virtual child_iterator child_begin(); 1029 virtual child_iterator child_end(); 1030}; 1031 1032/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1033/// 1034class MemberExpr : public Expr { 1035 /// Base - the expression for the base pointer or structure references. In 1036 /// X.F, this is "X". 1037 Stmt *Base; 1038 1039 /// MemberDecl - This is the decl being referenced by the field/member name. 1040 /// In X.F, this is the decl referenced by F. 1041 NamedDecl *MemberDecl; 1042 1043 /// MemberLoc - This is the location of the member name. 1044 SourceLocation MemberLoc; 1045 1046 /// IsArrow - True if this is "X->F", false if this is "X.F". 1047 bool IsArrow; 1048public: 1049 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1050 QualType ty) 1051 : Expr(MemberExprClass, ty, 1052 base->isTypeDependent(), base->isValueDependent()), 1053 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1054 1055 /// \brief Build an empty member reference expression. 1056 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1057 1058 void setBase(Expr *E) { Base = E; } 1059 Expr *getBase() const { return cast<Expr>(Base); } 1060 1061 /// \brief Retrieve the member declaration to which this expression refers. 1062 /// 1063 /// The returned declaration will either be a FieldDecl or (in C++) 1064 /// a CXXMethodDecl. 1065 NamedDecl *getMemberDecl() const { return MemberDecl; } 1066 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1067 1068 bool isArrow() const { return IsArrow; } 1069 void setArrow(bool A) { IsArrow = A; } 1070 1071 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1072 /// location of 'F'. 1073 SourceLocation getMemberLoc() const { return MemberLoc; } 1074 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1075 1076 virtual SourceRange getSourceRange() const { 1077 // If we have an implicit base (like a C++ implicit this), 1078 // make sure not to return its location 1079 SourceLocation BaseLoc = getBase()->getLocStart(); 1080 if (BaseLoc.isInvalid()) 1081 return SourceRange(MemberLoc, MemberLoc); 1082 return SourceRange(BaseLoc, MemberLoc); 1083 } 1084 1085 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1086 1087 static bool classof(const Stmt *T) { 1088 return T->getStmtClass() == MemberExprClass; 1089 } 1090 static bool classof(const MemberExpr *) { return true; } 1091 1092 // Iterators 1093 virtual child_iterator child_begin(); 1094 virtual child_iterator child_end(); 1095}; 1096 1097/// CompoundLiteralExpr - [C99 6.5.2.5] 1098/// 1099class CompoundLiteralExpr : public Expr { 1100 /// LParenLoc - If non-null, this is the location of the left paren in a 1101 /// compound literal like "(int){4}". This can be null if this is a 1102 /// synthesized compound expression. 1103 SourceLocation LParenLoc; 1104 Stmt *Init; 1105 bool FileScope; 1106public: 1107 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1108 bool fileScope) 1109 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1110 FileScope(fileScope) {} 1111 1112 /// \brief Construct an empty compound literal. 1113 explicit CompoundLiteralExpr(EmptyShell Empty) 1114 : Expr(CompoundLiteralExprClass, Empty) { } 1115 1116 const Expr *getInitializer() const { return cast<Expr>(Init); } 1117 Expr *getInitializer() { return cast<Expr>(Init); } 1118 void setInitializer(Expr *E) { Init = E; } 1119 1120 bool isFileScope() const { return FileScope; } 1121 void setFileScope(bool FS) { FileScope = FS; } 1122 1123 SourceLocation getLParenLoc() const { return LParenLoc; } 1124 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1125 1126 virtual SourceRange getSourceRange() const { 1127 // FIXME: Init should never be null. 1128 if (!Init) 1129 return SourceRange(); 1130 if (LParenLoc.isInvalid()) 1131 return Init->getSourceRange(); 1132 return SourceRange(LParenLoc, Init->getLocEnd()); 1133 } 1134 1135 static bool classof(const Stmt *T) { 1136 return T->getStmtClass() == CompoundLiteralExprClass; 1137 } 1138 static bool classof(const CompoundLiteralExpr *) { return true; } 1139 1140 // Iterators 1141 virtual child_iterator child_begin(); 1142 virtual child_iterator child_end(); 1143}; 1144 1145/// CastExpr - Base class for type casts, including both implicit 1146/// casts (ImplicitCastExpr) and explicit casts that have some 1147/// representation in the source code (ExplicitCastExpr's derived 1148/// classes). 1149class CastExpr : public Expr { 1150 Stmt *Op; 1151protected: 1152 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1153 Expr(SC, ty, 1154 // Cast expressions are type-dependent if the type is 1155 // dependent (C++ [temp.dep.expr]p3). 1156 ty->isDependentType(), 1157 // Cast expressions are value-dependent if the type is 1158 // dependent or if the subexpression is value-dependent. 1159 ty->isDependentType() || (op && op->isValueDependent())), 1160 Op(op) {} 1161 1162 /// \brief Construct an empty cast. 1163 CastExpr(StmtClass SC, EmptyShell Empty) 1164 : Expr(SC, Empty) { } 1165 1166public: 1167 Expr *getSubExpr() { return cast<Expr>(Op); } 1168 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1169 void setSubExpr(Expr *E) { Op = E; } 1170 1171 static bool classof(const Stmt *T) { 1172 StmtClass SC = T->getStmtClass(); 1173 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1174 return true; 1175 1176 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1177 return true; 1178 1179 return false; 1180 } 1181 static bool classof(const CastExpr *) { return true; } 1182 1183 // Iterators 1184 virtual child_iterator child_begin(); 1185 virtual child_iterator child_end(); 1186}; 1187 1188/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1189/// conversions, which have no direct representation in the original 1190/// source code. For example: converting T[]->T*, void f()->void 1191/// (*f)(), float->double, short->int, etc. 1192/// 1193/// In C, implicit casts always produce rvalues. However, in C++, an 1194/// implicit cast whose result is being bound to a reference will be 1195/// an lvalue. For example: 1196/// 1197/// @code 1198/// class Base { }; 1199/// class Derived : public Base { }; 1200/// void f(Derived d) { 1201/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1202/// } 1203/// @endcode 1204class ImplicitCastExpr : public CastExpr { 1205 /// LvalueCast - Whether this cast produces an lvalue. 1206 bool LvalueCast; 1207 1208public: 1209 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1210 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1211 1212 /// \brief Construct an empty implicit cast. 1213 explicit ImplicitCastExpr(EmptyShell Shell) 1214 : CastExpr(ImplicitCastExprClass, Shell) { } 1215 1216 1217 virtual SourceRange getSourceRange() const { 1218 return getSubExpr()->getSourceRange(); 1219 } 1220 1221 /// isLvalueCast - Whether this cast produces an lvalue. 1222 bool isLvalueCast() const { return LvalueCast; } 1223 1224 /// setLvalueCast - Set whether this cast produces an lvalue. 1225 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1226 1227 static bool classof(const Stmt *T) { 1228 return T->getStmtClass() == ImplicitCastExprClass; 1229 } 1230 static bool classof(const ImplicitCastExpr *) { return true; } 1231}; 1232 1233/// ExplicitCastExpr - An explicit cast written in the source 1234/// code. 1235/// 1236/// This class is effectively an abstract class, because it provides 1237/// the basic representation of an explicitly-written cast without 1238/// specifying which kind of cast (C cast, functional cast, static 1239/// cast, etc.) was written; specific derived classes represent the 1240/// particular style of cast and its location information. 1241/// 1242/// Unlike implicit casts, explicit cast nodes have two different 1243/// types: the type that was written into the source code, and the 1244/// actual type of the expression as determined by semantic 1245/// analysis. These types may differ slightly. For example, in C++ one 1246/// can cast to a reference type, which indicates that the resulting 1247/// expression will be an lvalue. The reference type, however, will 1248/// not be used as the type of the expression. 1249class ExplicitCastExpr : public CastExpr { 1250 /// TypeAsWritten - The type that this expression is casting to, as 1251 /// written in the source code. 1252 QualType TypeAsWritten; 1253 1254protected: 1255 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1256 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1257 1258 /// \brief Construct an empty explicit cast. 1259 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1260 : CastExpr(SC, Shell) { } 1261 1262public: 1263 /// getTypeAsWritten - Returns the type that this expression is 1264 /// casting to, as written in the source code. 1265 QualType getTypeAsWritten() const { return TypeAsWritten; } 1266 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1267 1268 static bool classof(const Stmt *T) { 1269 StmtClass SC = T->getStmtClass(); 1270 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1271 return true; 1272 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1273 return true; 1274 1275 return false; 1276 } 1277 static bool classof(const ExplicitCastExpr *) { return true; } 1278}; 1279 1280/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1281/// cast in C++ (C++ [expr.cast]), which uses the syntax 1282/// (Type)expr. For example: @c (int)f. 1283class CStyleCastExpr : public ExplicitCastExpr { 1284 SourceLocation LPLoc; // the location of the left paren 1285 SourceLocation RPLoc; // the location of the right paren 1286public: 1287 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1288 SourceLocation l, SourceLocation r) : 1289 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1290 LPLoc(l), RPLoc(r) {} 1291 1292 /// \brief Construct an empty C-style explicit cast. 1293 explicit CStyleCastExpr(EmptyShell Shell) 1294 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1295 1296 SourceLocation getLParenLoc() const { return LPLoc; } 1297 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1298 1299 SourceLocation getRParenLoc() const { return RPLoc; } 1300 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1301 1302 virtual SourceRange getSourceRange() const { 1303 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1304 } 1305 static bool classof(const Stmt *T) { 1306 return T->getStmtClass() == CStyleCastExprClass; 1307 } 1308 static bool classof(const CStyleCastExpr *) { return true; } 1309}; 1310 1311/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1312/// 1313/// This expression node kind describes a builtin binary operation, 1314/// such as "x + y" for integer values "x" and "y". The operands will 1315/// already have been converted to appropriate types (e.g., by 1316/// performing promotions or conversions). 1317/// 1318/// In C++, where operators may be overloaded, a different kind of 1319/// expression node (CXXOperatorCallExpr) is used to express the 1320/// invocation of an overloaded operator with operator syntax. Within 1321/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1322/// used to store an expression "x + y" depends on the subexpressions 1323/// for x and y. If neither x or y is type-dependent, and the "+" 1324/// operator resolves to a built-in operation, BinaryOperator will be 1325/// used to express the computation (x and y may still be 1326/// value-dependent). If either x or y is type-dependent, or if the 1327/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1328/// be used to express the computation. 1329class BinaryOperator : public Expr { 1330public: 1331 enum Opcode { 1332 // Operators listed in order of precedence. 1333 // Note that additions to this should also update the StmtVisitor class. 1334 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1335 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1336 Add, Sub, // [C99 6.5.6] Additive operators. 1337 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1338 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1339 EQ, NE, // [C99 6.5.9] Equality operators. 1340 And, // [C99 6.5.10] Bitwise AND operator. 1341 Xor, // [C99 6.5.11] Bitwise XOR operator. 1342 Or, // [C99 6.5.12] Bitwise OR operator. 1343 LAnd, // [C99 6.5.13] Logical AND operator. 1344 LOr, // [C99 6.5.14] Logical OR operator. 1345 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1346 DivAssign, RemAssign, 1347 AddAssign, SubAssign, 1348 ShlAssign, ShrAssign, 1349 AndAssign, XorAssign, 1350 OrAssign, 1351 Comma // [C99 6.5.17] Comma operator. 1352 }; 1353private: 1354 enum { LHS, RHS, END_EXPR }; 1355 Stmt* SubExprs[END_EXPR]; 1356 Opcode Opc; 1357 SourceLocation OpLoc; 1358public: 1359 1360 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1361 SourceLocation opLoc) 1362 : Expr(BinaryOperatorClass, ResTy, 1363 lhs->isTypeDependent() || rhs->isTypeDependent(), 1364 lhs->isValueDependent() || rhs->isValueDependent()), 1365 Opc(opc), OpLoc(opLoc) { 1366 SubExprs[LHS] = lhs; 1367 SubExprs[RHS] = rhs; 1368 assert(!isCompoundAssignmentOp() && 1369 "Use ArithAssignBinaryOperator for compound assignments"); 1370 } 1371 1372 /// \brief Construct an empty binary operator. 1373 explicit BinaryOperator(EmptyShell Empty) 1374 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1375 1376 SourceLocation getOperatorLoc() const { return OpLoc; } 1377 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1378 1379 Opcode getOpcode() const { return Opc; } 1380 void setOpcode(Opcode O) { Opc = O; } 1381 1382 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1383 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1384 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1385 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1386 1387 virtual SourceRange getSourceRange() const { 1388 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1389 } 1390 1391 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1392 /// corresponds to, e.g. "<<=". 1393 static const char *getOpcodeStr(Opcode Op); 1394 1395 /// \brief Retrieve the binary opcode that corresponds to the given 1396 /// overloaded operator. 1397 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1398 1399 /// \brief Retrieve the overloaded operator kind that corresponds to 1400 /// the given binary opcode. 1401 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1402 1403 /// predicates to categorize the respective opcodes. 1404 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1405 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1406 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1407 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1408 1409 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1410 bool isRelationalOp() const { return isRelationalOp(Opc); } 1411 1412 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1413 bool isEqualityOp() const { return isEqualityOp(Opc); } 1414 1415 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1416 bool isLogicalOp() const { return isLogicalOp(Opc); } 1417 1418 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1419 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1420 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1421 1422 static bool classof(const Stmt *S) { 1423 return S->getStmtClass() == BinaryOperatorClass || 1424 S->getStmtClass() == CompoundAssignOperatorClass; 1425 } 1426 static bool classof(const BinaryOperator *) { return true; } 1427 1428 // Iterators 1429 virtual child_iterator child_begin(); 1430 virtual child_iterator child_end(); 1431 1432protected: 1433 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1434 SourceLocation oploc, bool dead) 1435 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1436 SubExprs[LHS] = lhs; 1437 SubExprs[RHS] = rhs; 1438 } 1439 1440 BinaryOperator(StmtClass SC, EmptyShell Empty) 1441 : Expr(SC, Empty), Opc(MulAssign) { } 1442}; 1443 1444/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1445/// track of the type the operation is performed in. Due to the semantics of 1446/// these operators, the operands are promoted, the aritmetic performed, an 1447/// implicit conversion back to the result type done, then the assignment takes 1448/// place. This captures the intermediate type which the computation is done 1449/// in. 1450class CompoundAssignOperator : public BinaryOperator { 1451 QualType ComputationLHSType; 1452 QualType ComputationResultType; 1453public: 1454 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1455 QualType ResType, QualType CompLHSType, 1456 QualType CompResultType, 1457 SourceLocation OpLoc) 1458 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1459 ComputationLHSType(CompLHSType), 1460 ComputationResultType(CompResultType) { 1461 assert(isCompoundAssignmentOp() && 1462 "Only should be used for compound assignments"); 1463 } 1464 1465 /// \brief Build an empty compound assignment operator expression. 1466 explicit CompoundAssignOperator(EmptyShell Empty) 1467 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1468 1469 // The two computation types are the type the LHS is converted 1470 // to for the computation and the type of the result; the two are 1471 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1472 QualType getComputationLHSType() const { return ComputationLHSType; } 1473 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1474 1475 QualType getComputationResultType() const { return ComputationResultType; } 1476 void setComputationResultType(QualType T) { ComputationResultType = T; } 1477 1478 static bool classof(const CompoundAssignOperator *) { return true; } 1479 static bool classof(const Stmt *S) { 1480 return S->getStmtClass() == CompoundAssignOperatorClass; 1481 } 1482}; 1483 1484/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1485/// GNU "missing LHS" extension is in use. 1486/// 1487class ConditionalOperator : public Expr { 1488 enum { COND, LHS, RHS, END_EXPR }; 1489 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1490public: 1491 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1492 : Expr(ConditionalOperatorClass, t, 1493 // FIXME: the type of the conditional operator doesn't 1494 // depend on the type of the conditional, but the standard 1495 // seems to imply that it could. File a bug! 1496 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1497 (cond->isValueDependent() || 1498 (lhs && lhs->isValueDependent()) || 1499 (rhs && rhs->isValueDependent()))) { 1500 SubExprs[COND] = cond; 1501 SubExprs[LHS] = lhs; 1502 SubExprs[RHS] = rhs; 1503 } 1504 1505 /// \brief Build an empty conditional operator. 1506 explicit ConditionalOperator(EmptyShell Empty) 1507 : Expr(ConditionalOperatorClass, Empty) { } 1508 1509 // getCond - Return the expression representing the condition for 1510 // the ?: operator. 1511 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1512 void setCond(Expr *E) { SubExprs[COND] = E; } 1513 1514 // getTrueExpr - Return the subexpression representing the value of the ?: 1515 // expression if the condition evaluates to true. In most cases this value 1516 // will be the same as getLHS() except a GCC extension allows the left 1517 // subexpression to be omitted, and instead of the condition be returned. 1518 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1519 // is only evaluated once. 1520 Expr *getTrueExpr() const { 1521 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1522 } 1523 1524 // getTrueExpr - Return the subexpression representing the value of the ?: 1525 // expression if the condition evaluates to false. This is the same as getRHS. 1526 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1527 1528 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1529 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1530 1531 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1532 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1533 1534 virtual SourceRange getSourceRange() const { 1535 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1536 } 1537 static bool classof(const Stmt *T) { 1538 return T->getStmtClass() == ConditionalOperatorClass; 1539 } 1540 static bool classof(const ConditionalOperator *) { return true; } 1541 1542 // Iterators 1543 virtual child_iterator child_begin(); 1544 virtual child_iterator child_end(); 1545}; 1546 1547/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1548class AddrLabelExpr : public Expr { 1549 SourceLocation AmpAmpLoc, LabelLoc; 1550 LabelStmt *Label; 1551public: 1552 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1553 QualType t) 1554 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1555 1556 /// \brief Build an empty address of a label expression. 1557 explicit AddrLabelExpr(EmptyShell Empty) 1558 : Expr(AddrLabelExprClass, Empty) { } 1559 1560 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1561 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1562 SourceLocation getLabelLoc() const { return LabelLoc; } 1563 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1564 1565 virtual SourceRange getSourceRange() const { 1566 return SourceRange(AmpAmpLoc, LabelLoc); 1567 } 1568 1569 LabelStmt *getLabel() const { return Label; } 1570 void setLabel(LabelStmt *S) { Label = S; } 1571 1572 static bool classof(const Stmt *T) { 1573 return T->getStmtClass() == AddrLabelExprClass; 1574 } 1575 static bool classof(const AddrLabelExpr *) { return true; } 1576 1577 // Iterators 1578 virtual child_iterator child_begin(); 1579 virtual child_iterator child_end(); 1580}; 1581 1582/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1583/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1584/// takes the value of the last subexpression. 1585class StmtExpr : public Expr { 1586 Stmt *SubStmt; 1587 SourceLocation LParenLoc, RParenLoc; 1588public: 1589 StmtExpr(CompoundStmt *substmt, QualType T, 1590 SourceLocation lp, SourceLocation rp) : 1591 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1592 1593 /// \brief Build an empty statement expression. 1594 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 1595 1596 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1597 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1598 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 1599 1600 virtual SourceRange getSourceRange() const { 1601 return SourceRange(LParenLoc, RParenLoc); 1602 } 1603 1604 SourceLocation getLParenLoc() const { return LParenLoc; } 1605 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1606 SourceLocation getRParenLoc() const { return RParenLoc; } 1607 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1608 1609 static bool classof(const Stmt *T) { 1610 return T->getStmtClass() == StmtExprClass; 1611 } 1612 static bool classof(const StmtExpr *) { return true; } 1613 1614 // Iterators 1615 virtual child_iterator child_begin(); 1616 virtual child_iterator child_end(); 1617}; 1618 1619/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1620/// This AST node represents a function that returns 1 if two *types* (not 1621/// expressions) are compatible. The result of this built-in function can be 1622/// used in integer constant expressions. 1623class TypesCompatibleExpr : public Expr { 1624 QualType Type1; 1625 QualType Type2; 1626 SourceLocation BuiltinLoc, RParenLoc; 1627public: 1628 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1629 QualType t1, QualType t2, SourceLocation RP) : 1630 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1631 BuiltinLoc(BLoc), RParenLoc(RP) {} 1632 1633 /// \brief Build an empty __builtin_type_compatible_p expression. 1634 explicit TypesCompatibleExpr(EmptyShell Empty) 1635 : Expr(TypesCompatibleExprClass, Empty) { } 1636 1637 QualType getArgType1() const { return Type1; } 1638 void setArgType1(QualType T) { Type1 = T; } 1639 QualType getArgType2() const { return Type2; } 1640 void setArgType2(QualType T) { Type2 = T; } 1641 1642 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1643 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1644 1645 SourceLocation getRParenLoc() const { return RParenLoc; } 1646 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1647 1648 virtual SourceRange getSourceRange() const { 1649 return SourceRange(BuiltinLoc, RParenLoc); 1650 } 1651 static bool classof(const Stmt *T) { 1652 return T->getStmtClass() == TypesCompatibleExprClass; 1653 } 1654 static bool classof(const TypesCompatibleExpr *) { return true; } 1655 1656 // Iterators 1657 virtual child_iterator child_begin(); 1658 virtual child_iterator child_end(); 1659}; 1660 1661/// ShuffleVectorExpr - clang-specific builtin-in function 1662/// __builtin_shufflevector. 1663/// This AST node represents a operator that does a constant 1664/// shuffle, similar to LLVM's shufflevector instruction. It takes 1665/// two vectors and a variable number of constant indices, 1666/// and returns the appropriately shuffled vector. 1667class ShuffleVectorExpr : public Expr { 1668 SourceLocation BuiltinLoc, RParenLoc; 1669 1670 // SubExprs - the list of values passed to the __builtin_shufflevector 1671 // function. The first two are vectors, and the rest are constant 1672 // indices. The number of values in this list is always 1673 // 2+the number of indices in the vector type. 1674 Stmt **SubExprs; 1675 unsigned NumExprs; 1676 1677public: 1678 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1679 QualType Type, SourceLocation BLoc, 1680 SourceLocation RP) : 1681 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1682 RParenLoc(RP), NumExprs(nexpr) { 1683 1684 SubExprs = new Stmt*[nexpr]; 1685 for (unsigned i = 0; i < nexpr; i++) 1686 SubExprs[i] = args[i]; 1687 } 1688 1689 /// \brief Build an empty vector-shuffle expression. 1690 explicit ShuffleVectorExpr(EmptyShell Empty) 1691 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1692 1693 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1694 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1695 1696 SourceLocation getRParenLoc() const { return RParenLoc; } 1697 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1698 1699 virtual SourceRange getSourceRange() const { 1700 return SourceRange(BuiltinLoc, RParenLoc); 1701 } 1702 static bool classof(const Stmt *T) { 1703 return T->getStmtClass() == ShuffleVectorExprClass; 1704 } 1705 static bool classof(const ShuffleVectorExpr *) { return true; } 1706 1707 ~ShuffleVectorExpr() { 1708 delete [] SubExprs; 1709 } 1710 1711 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1712 /// constant expression, the actual arguments passed in, and the function 1713 /// pointers. 1714 unsigned getNumSubExprs() const { return NumExprs; } 1715 1716 /// getExpr - Return the Expr at the specified index. 1717 Expr *getExpr(unsigned Index) { 1718 assert((Index < NumExprs) && "Arg access out of range!"); 1719 return cast<Expr>(SubExprs[Index]); 1720 } 1721 const Expr *getExpr(unsigned Index) const { 1722 assert((Index < NumExprs) && "Arg access out of range!"); 1723 return cast<Expr>(SubExprs[Index]); 1724 } 1725 1726 void setExprs(Expr ** Exprs, unsigned NumExprs); 1727 1728 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1729 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1730 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 1731 } 1732 1733 // Iterators 1734 virtual child_iterator child_begin(); 1735 virtual child_iterator child_end(); 1736}; 1737 1738/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1739/// This AST node is similar to the conditional operator (?:) in C, with 1740/// the following exceptions: 1741/// - the test expression must be a integer constant expression. 1742/// - the expression returned acts like the chosen subexpression in every 1743/// visible way: the type is the same as that of the chosen subexpression, 1744/// and all predicates (whether it's an l-value, whether it's an integer 1745/// constant expression, etc.) return the same result as for the chosen 1746/// sub-expression. 1747class ChooseExpr : public Expr { 1748 enum { COND, LHS, RHS, END_EXPR }; 1749 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1750 SourceLocation BuiltinLoc, RParenLoc; 1751public: 1752 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1753 SourceLocation RP) 1754 : Expr(ChooseExprClass, t), 1755 BuiltinLoc(BLoc), RParenLoc(RP) { 1756 SubExprs[COND] = cond; 1757 SubExprs[LHS] = lhs; 1758 SubExprs[RHS] = rhs; 1759 } 1760 1761 /// \brief Build an empty __builtin_choose_expr. 1762 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1763 1764 /// isConditionTrue - Return whether the condition is true (i.e. not 1765 /// equal to zero). 1766 bool isConditionTrue(ASTContext &C) const; 1767 1768 /// getChosenSubExpr - Return the subexpression chosen according to the 1769 /// condition. 1770 Expr *getChosenSubExpr(ASTContext &C) const { 1771 return isConditionTrue(C) ? getLHS() : getRHS(); 1772 } 1773 1774 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1775 void setCond(Expr *E) { SubExprs[COND] = E; } 1776 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1777 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1778 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1779 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1780 1781 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1782 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1783 1784 SourceLocation getRParenLoc() const { return RParenLoc; } 1785 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1786 1787 virtual SourceRange getSourceRange() const { 1788 return SourceRange(BuiltinLoc, RParenLoc); 1789 } 1790 static bool classof(const Stmt *T) { 1791 return T->getStmtClass() == ChooseExprClass; 1792 } 1793 static bool classof(const ChooseExpr *) { return true; } 1794 1795 // Iterators 1796 virtual child_iterator child_begin(); 1797 virtual child_iterator child_end(); 1798}; 1799 1800/// GNUNullExpr - Implements the GNU __null extension, which is a name 1801/// for a null pointer constant that has integral type (e.g., int or 1802/// long) and is the same size and alignment as a pointer. The __null 1803/// extension is typically only used by system headers, which define 1804/// NULL as __null in C++ rather than using 0 (which is an integer 1805/// that may not match the size of a pointer). 1806class GNUNullExpr : public Expr { 1807 /// TokenLoc - The location of the __null keyword. 1808 SourceLocation TokenLoc; 1809 1810public: 1811 GNUNullExpr(QualType Ty, SourceLocation Loc) 1812 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1813 1814 /// \brief Build an empty GNU __null expression. 1815 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1816 1817 GNUNullExpr* Clone(ASTContext &C) const; 1818 1819 /// getTokenLocation - The location of the __null token. 1820 SourceLocation getTokenLocation() const { return TokenLoc; } 1821 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1822 1823 virtual SourceRange getSourceRange() const { 1824 return SourceRange(TokenLoc); 1825 } 1826 static bool classof(const Stmt *T) { 1827 return T->getStmtClass() == GNUNullExprClass; 1828 } 1829 static bool classof(const GNUNullExpr *) { return true; } 1830 1831 // Iterators 1832 virtual child_iterator child_begin(); 1833 virtual child_iterator child_end(); 1834}; 1835 1836/// VAArgExpr, used for the builtin function __builtin_va_start. 1837class VAArgExpr : public Expr { 1838 Stmt *Val; 1839 SourceLocation BuiltinLoc, RParenLoc; 1840public: 1841 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1842 : Expr(VAArgExprClass, t), 1843 Val(e), 1844 BuiltinLoc(BLoc), 1845 RParenLoc(RPLoc) { } 1846 1847 /// \brief Create an empty __builtin_va_start expression. 1848 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1849 1850 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1851 Expr *getSubExpr() { return cast<Expr>(Val); } 1852 void setSubExpr(Expr *E) { Val = E; } 1853 1854 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1855 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1856 1857 SourceLocation getRParenLoc() const { return RParenLoc; } 1858 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1859 1860 virtual SourceRange getSourceRange() const { 1861 return SourceRange(BuiltinLoc, RParenLoc); 1862 } 1863 static bool classof(const Stmt *T) { 1864 return T->getStmtClass() == VAArgExprClass; 1865 } 1866 static bool classof(const VAArgExpr *) { return true; } 1867 1868 // Iterators 1869 virtual child_iterator child_begin(); 1870 virtual child_iterator child_end(); 1871}; 1872 1873/// @brief Describes an C or C++ initializer list. 1874/// 1875/// InitListExpr describes an initializer list, which can be used to 1876/// initialize objects of different types, including 1877/// struct/class/union types, arrays, and vectors. For example: 1878/// 1879/// @code 1880/// struct foo x = { 1, { 2, 3 } }; 1881/// @endcode 1882/// 1883/// Prior to semantic analysis, an initializer list will represent the 1884/// initializer list as written by the user, but will have the 1885/// placeholder type "void". This initializer list is called the 1886/// syntactic form of the initializer, and may contain C99 designated 1887/// initializers (represented as DesignatedInitExprs), initializations 1888/// of subobject members without explicit braces, and so on. Clients 1889/// interested in the original syntax of the initializer list should 1890/// use the syntactic form of the initializer list. 1891/// 1892/// After semantic analysis, the initializer list will represent the 1893/// semantic form of the initializer, where the initializations of all 1894/// subobjects are made explicit with nested InitListExpr nodes and 1895/// C99 designators have been eliminated by placing the designated 1896/// initializations into the subobject they initialize. Additionally, 1897/// any "holes" in the initialization, where no initializer has been 1898/// specified for a particular subobject, will be replaced with 1899/// implicitly-generated ImplicitValueInitExpr expressions that 1900/// value-initialize the subobjects. Note, however, that the 1901/// initializer lists may still have fewer initializers than there are 1902/// elements to initialize within the object. 1903/// 1904/// Given the semantic form of the initializer list, one can retrieve 1905/// the original syntactic form of that initializer list (if it 1906/// exists) using getSyntacticForm(). Since many initializer lists 1907/// have the same syntactic and semantic forms, getSyntacticForm() may 1908/// return NULL, indicating that the current initializer list also 1909/// serves as its syntactic form. 1910class InitListExpr : public Expr { 1911 std::vector<Stmt *> InitExprs; 1912 SourceLocation LBraceLoc, RBraceLoc; 1913 1914 /// Contains the initializer list that describes the syntactic form 1915 /// written in the source code. 1916 InitListExpr *SyntacticForm; 1917 1918 /// If this initializer list initializes a union, specifies which 1919 /// field within the union will be initialized. 1920 FieldDecl *UnionFieldInit; 1921 1922 /// Whether this initializer list originally had a GNU array-range 1923 /// designator in it. This is a temporary marker used by CodeGen. 1924 bool HadArrayRangeDesignator; 1925 1926public: 1927 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1928 SourceLocation rbraceloc); 1929 1930 /// \brief Build an empty initializer list. 1931 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1932 1933 unsigned getNumInits() const { return InitExprs.size(); } 1934 1935 const Expr* getInit(unsigned Init) const { 1936 assert(Init < getNumInits() && "Initializer access out of range!"); 1937 return cast_or_null<Expr>(InitExprs[Init]); 1938 } 1939 1940 Expr* getInit(unsigned Init) { 1941 assert(Init < getNumInits() && "Initializer access out of range!"); 1942 return cast_or_null<Expr>(InitExprs[Init]); 1943 } 1944 1945 void setInit(unsigned Init, Expr *expr) { 1946 assert(Init < getNumInits() && "Initializer access out of range!"); 1947 InitExprs[Init] = expr; 1948 } 1949 1950 /// \brief Reserve space for some number of initializers. 1951 void reserveInits(unsigned NumInits); 1952 1953 /// @brief Specify the number of initializers 1954 /// 1955 /// If there are more than @p NumInits initializers, the remaining 1956 /// initializers will be destroyed. If there are fewer than @p 1957 /// NumInits initializers, NULL expressions will be added for the 1958 /// unknown initializers. 1959 void resizeInits(ASTContext &Context, unsigned NumInits); 1960 1961 /// @brief Updates the initializer at index @p Init with the new 1962 /// expression @p expr, and returns the old expression at that 1963 /// location. 1964 /// 1965 /// When @p Init is out of range for this initializer list, the 1966 /// initializer list will be extended with NULL expressions to 1967 /// accomodate the new entry. 1968 Expr *updateInit(unsigned Init, Expr *expr); 1969 1970 /// \brief If this initializes a union, specifies which field in the 1971 /// union to initialize. 1972 /// 1973 /// Typically, this field is the first named field within the 1974 /// union. However, a designated initializer can specify the 1975 /// initialization of a different field within the union. 1976 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1977 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1978 1979 // Explicit InitListExpr's originate from source code (and have valid source 1980 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1981 bool isExplicit() { 1982 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1983 } 1984 1985 SourceLocation getLBraceLoc() const { return LBraceLoc; } 1986 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 1987 SourceLocation getRBraceLoc() const { return RBraceLoc; } 1988 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1989 1990 /// @brief Retrieve the initializer list that describes the 1991 /// syntactic form of the initializer. 1992 /// 1993 /// 1994 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1995 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1996 1997 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1998 void sawArrayRangeDesignator(bool ARD = true) { 1999 HadArrayRangeDesignator = ARD; 2000 } 2001 2002 virtual SourceRange getSourceRange() const { 2003 return SourceRange(LBraceLoc, RBraceLoc); 2004 } 2005 static bool classof(const Stmt *T) { 2006 return T->getStmtClass() == InitListExprClass; 2007 } 2008 static bool classof(const InitListExpr *) { return true; } 2009 2010 // Iterators 2011 virtual child_iterator child_begin(); 2012 virtual child_iterator child_end(); 2013 2014 typedef std::vector<Stmt *>::iterator iterator; 2015 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2016 2017 iterator begin() { return InitExprs.begin(); } 2018 iterator end() { return InitExprs.end(); } 2019 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2020 reverse_iterator rend() { return InitExprs.rend(); } 2021}; 2022 2023/// @brief Represents a C99 designated initializer expression. 2024/// 2025/// A designated initializer expression (C99 6.7.8) contains one or 2026/// more designators (which can be field designators, array 2027/// designators, or GNU array-range designators) followed by an 2028/// expression that initializes the field or element(s) that the 2029/// designators refer to. For example, given: 2030/// 2031/// @code 2032/// struct point { 2033/// double x; 2034/// double y; 2035/// }; 2036/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2037/// @endcode 2038/// 2039/// The InitListExpr contains three DesignatedInitExprs, the first of 2040/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2041/// designators, one array designator for @c [2] followed by one field 2042/// designator for @c .y. The initalization expression will be 1.0. 2043class DesignatedInitExpr : public Expr { 2044public: 2045 /// \brief Forward declaration of the Designator class. 2046 class Designator; 2047 2048private: 2049 /// The location of the '=' or ':' prior to the actual initializer 2050 /// expression. 2051 SourceLocation EqualOrColonLoc; 2052 2053 /// Whether this designated initializer used the GNU deprecated 2054 /// syntax rather than the C99 '=' syntax. 2055 bool GNUSyntax : 1; 2056 2057 /// The number of designators in this initializer expression. 2058 unsigned NumDesignators : 15; 2059 2060 /// \brief The designators in this designated initialization 2061 /// expression. 2062 Designator *Designators; 2063 2064 /// The number of subexpressions of this initializer expression, 2065 /// which contains both the initializer and any additional 2066 /// expressions used by array and array-range designators. 2067 unsigned NumSubExprs : 16; 2068 2069 2070 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2071 const Designator *Designators, 2072 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2073 unsigned NumSubExprs); 2074 2075 explicit DesignatedInitExpr(unsigned NumSubExprs) 2076 : Expr(DesignatedInitExprClass, EmptyShell()), 2077 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2078 2079public: 2080 /// A field designator, e.g., ".x". 2081 struct FieldDesignator { 2082 /// Refers to the field that is being initialized. The low bit 2083 /// of this field determines whether this is actually a pointer 2084 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2085 /// initially constructed, a field designator will store an 2086 /// IdentifierInfo*. After semantic analysis has resolved that 2087 /// name, the field designator will instead store a FieldDecl*. 2088 uintptr_t NameOrField; 2089 2090 /// The location of the '.' in the designated initializer. 2091 unsigned DotLoc; 2092 2093 /// The location of the field name in the designated initializer. 2094 unsigned FieldLoc; 2095 }; 2096 2097 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2098 struct ArrayOrRangeDesignator { 2099 /// Location of the first index expression within the designated 2100 /// initializer expression's list of subexpressions. 2101 unsigned Index; 2102 /// The location of the '[' starting the array range designator. 2103 unsigned LBracketLoc; 2104 /// The location of the ellipsis separating the start and end 2105 /// indices. Only valid for GNU array-range designators. 2106 unsigned EllipsisLoc; 2107 /// The location of the ']' terminating the array range designator. 2108 unsigned RBracketLoc; 2109 }; 2110 2111 /// @brief Represents a single C99 designator. 2112 /// 2113 /// @todo This class is infuriatingly similar to clang::Designator, 2114 /// but minor differences (storing indices vs. storing pointers) 2115 /// keep us from reusing it. Try harder, later, to rectify these 2116 /// differences. 2117 class Designator { 2118 /// @brief The kind of designator this describes. 2119 enum { 2120 FieldDesignator, 2121 ArrayDesignator, 2122 ArrayRangeDesignator 2123 } Kind; 2124 2125 union { 2126 /// A field designator, e.g., ".x". 2127 struct FieldDesignator Field; 2128 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2129 struct ArrayOrRangeDesignator ArrayOrRange; 2130 }; 2131 friend class DesignatedInitExpr; 2132 2133 public: 2134 Designator() {} 2135 2136 /// @brief Initializes a field designator. 2137 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2138 SourceLocation FieldLoc) 2139 : Kind(FieldDesignator) { 2140 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2141 Field.DotLoc = DotLoc.getRawEncoding(); 2142 Field.FieldLoc = FieldLoc.getRawEncoding(); 2143 } 2144 2145 /// @brief Initializes an array designator. 2146 Designator(unsigned Index, SourceLocation LBracketLoc, 2147 SourceLocation RBracketLoc) 2148 : Kind(ArrayDesignator) { 2149 ArrayOrRange.Index = Index; 2150 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2151 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2152 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2153 } 2154 2155 /// @brief Initializes a GNU array-range designator. 2156 Designator(unsigned Index, SourceLocation LBracketLoc, 2157 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2158 : Kind(ArrayRangeDesignator) { 2159 ArrayOrRange.Index = Index; 2160 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2161 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2162 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2163 } 2164 2165 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2166 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2167 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2168 2169 IdentifierInfo * getFieldName(); 2170 2171 FieldDecl *getField() { 2172 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2173 if (Field.NameOrField & 0x01) 2174 return 0; 2175 else 2176 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2177 } 2178 2179 void setField(FieldDecl *FD) { 2180 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2181 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2182 } 2183 2184 SourceLocation getDotLoc() const { 2185 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2186 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2187 } 2188 2189 SourceLocation getFieldLoc() const { 2190 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2191 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2192 } 2193 2194 SourceLocation getLBracketLoc() const { 2195 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2196 "Only valid on an array or array-range designator"); 2197 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2198 } 2199 2200 SourceLocation getRBracketLoc() const { 2201 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2202 "Only valid on an array or array-range designator"); 2203 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2204 } 2205 2206 SourceLocation getEllipsisLoc() const { 2207 assert(Kind == ArrayRangeDesignator && 2208 "Only valid on an array-range designator"); 2209 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2210 } 2211 2212 unsigned getFirstExprIndex() const { 2213 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2214 "Only valid on an array or array-range designator"); 2215 return ArrayOrRange.Index; 2216 } 2217 2218 SourceLocation getStartLocation() const { 2219 if (Kind == FieldDesignator) 2220 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2221 else 2222 return getLBracketLoc(); 2223 } 2224 }; 2225 2226 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2227 unsigned NumDesignators, 2228 Expr **IndexExprs, unsigned NumIndexExprs, 2229 SourceLocation EqualOrColonLoc, 2230 bool GNUSyntax, Expr *Init); 2231 2232 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2233 2234 /// @brief Returns the number of designators in this initializer. 2235 unsigned size() const { return NumDesignators; } 2236 2237 // Iterator access to the designators. 2238 typedef Designator* designators_iterator; 2239 designators_iterator designators_begin() { return Designators; } 2240 designators_iterator designators_end() { 2241 return Designators + NumDesignators; 2242 } 2243 2244 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2245 2246 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2247 2248 Expr *getArrayIndex(const Designator& D); 2249 Expr *getArrayRangeStart(const Designator& D); 2250 Expr *getArrayRangeEnd(const Designator& D); 2251 2252 /// @brief Retrieve the location of the '=' that precedes the 2253 /// initializer value itself, if present. 2254 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2255 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2256 2257 /// @brief Determines whether this designated initializer used the 2258 /// deprecated GNU syntax for designated initializers. 2259 bool usesGNUSyntax() const { return GNUSyntax; } 2260 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2261 2262 /// @brief Retrieve the initializer value. 2263 Expr *getInit() const { 2264 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2265 } 2266 2267 void setInit(Expr *init) { 2268 *child_begin() = init; 2269 } 2270 2271 /// \brief Retrieve the total number of subexpressions in this 2272 /// designated initializer expression, including the actual 2273 /// initialized value and any expressions that occur within array 2274 /// and array-range designators. 2275 unsigned getNumSubExprs() const { return NumSubExprs; } 2276 2277 Expr *getSubExpr(unsigned Idx) { 2278 assert(Idx < NumSubExprs && "Subscript out of range"); 2279 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2280 Ptr += sizeof(DesignatedInitExpr); 2281 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2282 } 2283 2284 void setSubExpr(unsigned Idx, Expr *E) { 2285 assert(Idx < NumSubExprs && "Subscript out of range"); 2286 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2287 Ptr += sizeof(DesignatedInitExpr); 2288 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2289 } 2290 2291 /// \brief Replaces the designator at index @p Idx with the series 2292 /// of designators in [First, Last). 2293 void ExpandDesignator(unsigned Idx, const Designator *First, 2294 const Designator *Last); 2295 2296 virtual SourceRange getSourceRange() const; 2297 2298 virtual void Destroy(ASTContext &C); 2299 2300 static bool classof(const Stmt *T) { 2301 return T->getStmtClass() == DesignatedInitExprClass; 2302 } 2303 static bool classof(const DesignatedInitExpr *) { return true; } 2304 2305 // Iterators 2306 virtual child_iterator child_begin(); 2307 virtual child_iterator child_end(); 2308}; 2309 2310/// \brief Represents an implicitly-generated value initialization of 2311/// an object of a given type. 2312/// 2313/// Implicit value initializations occur within semantic initializer 2314/// list expressions (InitListExpr) as placeholders for subobject 2315/// initializations not explicitly specified by the user. 2316/// 2317/// \see InitListExpr 2318class ImplicitValueInitExpr : public Expr { 2319public: 2320 explicit ImplicitValueInitExpr(QualType ty) 2321 : Expr(ImplicitValueInitExprClass, ty) { } 2322 2323 /// \brief Construct an empty implicit value initialization. 2324 explicit ImplicitValueInitExpr(EmptyShell Empty) 2325 : Expr(ImplicitValueInitExprClass, Empty) { } 2326 2327 static bool classof(const Stmt *T) { 2328 return T->getStmtClass() == ImplicitValueInitExprClass; 2329 } 2330 static bool classof(const ImplicitValueInitExpr *) { return true; } 2331 2332 virtual SourceRange getSourceRange() const { 2333 return SourceRange(); 2334 } 2335 2336 // Iterators 2337 virtual child_iterator child_begin(); 2338 virtual child_iterator child_end(); 2339}; 2340 2341//===----------------------------------------------------------------------===// 2342// Clang Extensions 2343//===----------------------------------------------------------------------===// 2344 2345 2346/// ExtVectorElementExpr - This represents access to specific elements of a 2347/// vector, and may occur on the left hand side or right hand side. For example 2348/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2349/// 2350/// Note that the base may have either vector or pointer to vector type, just 2351/// like a struct field reference. 2352/// 2353class ExtVectorElementExpr : public Expr { 2354 Stmt *Base; 2355 IdentifierInfo *Accessor; 2356 SourceLocation AccessorLoc; 2357public: 2358 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2359 SourceLocation loc) 2360 : Expr(ExtVectorElementExprClass, ty), 2361 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2362 2363 /// \brief Build an empty vector element expression. 2364 explicit ExtVectorElementExpr(EmptyShell Empty) 2365 : Expr(ExtVectorElementExprClass, Empty) { } 2366 2367 const Expr *getBase() const { return cast<Expr>(Base); } 2368 Expr *getBase() { return cast<Expr>(Base); } 2369 void setBase(Expr *E) { Base = E; } 2370 2371 IdentifierInfo &getAccessor() const { return *Accessor; } 2372 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2373 2374 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2375 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2376 2377 /// getNumElements - Get the number of components being selected. 2378 unsigned getNumElements() const; 2379 2380 /// containsDuplicateElements - Return true if any element access is 2381 /// repeated. 2382 bool containsDuplicateElements() const; 2383 2384 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2385 /// aggregate Constant of ConstantInt(s). 2386 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2387 2388 virtual SourceRange getSourceRange() const { 2389 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2390 } 2391 2392 /// isArrow - Return true if the base expression is a pointer to vector, 2393 /// return false if the base expression is a vector. 2394 bool isArrow() const; 2395 2396 static bool classof(const Stmt *T) { 2397 return T->getStmtClass() == ExtVectorElementExprClass; 2398 } 2399 static bool classof(const ExtVectorElementExpr *) { return true; } 2400 2401 // Iterators 2402 virtual child_iterator child_begin(); 2403 virtual child_iterator child_end(); 2404}; 2405 2406 2407/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2408/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2409class BlockExpr : public Expr { 2410protected: 2411 BlockDecl *TheBlock; 2412 bool HasBlockDeclRefExprs; 2413public: 2414 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2415 : Expr(BlockExprClass, ty), 2416 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2417 2418 /// \brief Build an empty block expression. 2419 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2420 2421 const BlockDecl *getBlockDecl() const { return TheBlock; } 2422 BlockDecl *getBlockDecl() { return TheBlock; } 2423 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2424 2425 // Convenience functions for probing the underlying BlockDecl. 2426 SourceLocation getCaretLocation() const; 2427 const Stmt *getBody() const; 2428 Stmt *getBody(); 2429 2430 const Stmt *getBody(ASTContext &C) const { return getBody(); } 2431 Stmt *getBody(ASTContext &C) { return getBody(); } 2432 2433 virtual SourceRange getSourceRange() const { 2434 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2435 } 2436 2437 /// getFunctionType - Return the underlying function type for this block. 2438 const FunctionType *getFunctionType() const; 2439 2440 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2441 /// inside of the block that reference values outside the block. 2442 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2443 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2444 2445 static bool classof(const Stmt *T) { 2446 return T->getStmtClass() == BlockExprClass; 2447 } 2448 static bool classof(const BlockExpr *) { return true; } 2449 2450 // Iterators 2451 virtual child_iterator child_begin(); 2452 virtual child_iterator child_end(); 2453}; 2454 2455/// BlockDeclRefExpr - A reference to a declared variable, function, 2456/// enum, etc. 2457class BlockDeclRefExpr : public Expr { 2458 ValueDecl *D; 2459 SourceLocation Loc; 2460 bool IsByRef; 2461public: 2462 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2463 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2464 2465 // \brief Build an empty reference to a declared variable in a 2466 // block. 2467 explicit BlockDeclRefExpr(EmptyShell Empty) 2468 : Expr(BlockDeclRefExprClass, Empty) { } 2469 2470 ValueDecl *getDecl() { return D; } 2471 const ValueDecl *getDecl() const { return D; } 2472 void setDecl(ValueDecl *VD) { D = VD; } 2473 2474 SourceLocation getLocation() const { return Loc; } 2475 void setLocation(SourceLocation L) { Loc = L; } 2476 2477 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2478 2479 bool isByRef() const { return IsByRef; } 2480 void setByRef(bool BR) { IsByRef = BR; } 2481 2482 static bool classof(const Stmt *T) { 2483 return T->getStmtClass() == BlockDeclRefExprClass; 2484 } 2485 static bool classof(const BlockDeclRefExpr *) { return true; } 2486 2487 // Iterators 2488 virtual child_iterator child_begin(); 2489 virtual child_iterator child_end(); 2490}; 2491 2492} // end namespace clang 2493 2494#endif 2495