Expr.h revision 393c247fe025ccb5f914e37e948192ea86faef8c
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 "llvm/ADT/StringRef.h" 24#include <vector> 25 26namespace clang { 27 class ASTContext; 28 class APValue; 29 class Decl; 30 class IdentifierInfo; 31 class ParmVarDecl; 32 class NamedDecl; 33 class ValueDecl; 34 class BlockDecl; 35 class CXXOperatorCallExpr; 36 class CXXMemberCallExpr; 37 class TemplateArgumentLoc; 38 39/// Expr - This represents one expression. Note that Expr's are subclasses of 40/// Stmt. This allows an expression to be transparently used any place a Stmt 41/// is required. 42/// 43class Expr : public Stmt { 44 QualType TR; 45 46protected: 47 /// TypeDependent - Whether this expression is type-dependent 48 /// (C++ [temp.dep.expr]). 49 bool TypeDependent : 1; 50 51 /// ValueDependent - Whether this expression is value-dependent 52 /// (C++ [temp.dep.constexpr]). 53 bool ValueDependent : 1; 54 55 // FIXME: Eventually, this constructor should go away and we should 56 // require every subclass to provide type/value-dependence 57 // information. 58 Expr(StmtClass SC, QualType T) 59 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 60 setType(T); 61 } 62 63 Expr(StmtClass SC, QualType T, bool TD, bool VD) 64 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 65 setType(T); 66 } 67 68 /// \brief Construct an empty expression. 69 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 70 71public: 72 /// \brief Increases the reference count for this expression. 73 /// 74 /// Invoke the Retain() operation when this expression 75 /// is being shared by another owner. 76 Expr *Retain() { 77 Stmt::Retain(); 78 return this; 79 } 80 81 QualType getType() const { return TR; } 82 void setType(QualType t) { 83 // In C++, the type of an expression is always adjusted so that it 84 // will not have reference type an expression will never have 85 // reference type (C++ [expr]p6). Use 86 // QualType::getNonReferenceType() to retrieve the non-reference 87 // type. Additionally, inspect Expr::isLvalue to determine whether 88 // an expression that is adjusted in this manner should be 89 // considered an lvalue. 90 assert((TR.isNull() || !TR->isReferenceType()) && 91 "Expressions can't have reference type"); 92 93 TR = t; 94 } 95 96 /// isValueDependent - Determines whether this expression is 97 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 98 /// array bound of "Chars" in the following example is 99 /// value-dependent. 100 /// @code 101 /// template<int Size, char (&Chars)[Size]> struct meta_string; 102 /// @endcode 103 bool isValueDependent() const { return ValueDependent; } 104 105 /// \brief Set whether this expression is value-dependent or not. 106 void setValueDependent(bool VD) { ValueDependent = VD; } 107 108 /// isTypeDependent - Determines whether this expression is 109 /// type-dependent (C++ [temp.dep.expr]), which means that its type 110 /// could change from one template instantiation to the next. For 111 /// example, the expressions "x" and "x + y" are type-dependent in 112 /// the following code, but "y" is not type-dependent: 113 /// @code 114 /// template<typename T> 115 /// void add(T x, int y) { 116 /// x + y; 117 /// } 118 /// @endcode 119 bool isTypeDependent() const { return TypeDependent; } 120 121 /// \brief Set whether this expression is type-dependent or not. 122 void setTypeDependent(bool TD) { TypeDependent = TD; } 123 124 /// SourceLocation tokens are not useful in isolation - they are low level 125 /// value objects created/interpreted by SourceManager. We assume AST 126 /// clients will have a pointer to the respective SourceManager. 127 virtual SourceRange getSourceRange() const = 0; 128 129 /// getExprLoc - Return the preferred location for the arrow when diagnosing 130 /// a problem with a generic expression. 131 virtual SourceLocation getExprLoc() const { return getLocStart(); } 132 133 /// isUnusedResultAWarning - Return true if this immediate expression should 134 /// be warned about if the result is unused. If so, fill in Loc and Ranges 135 /// with location to warn on and the source range[s] to report with the 136 /// warning. 137 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 138 SourceRange &R2, ASTContext &Ctx) const; 139 140 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 141 /// incomplete type other than void. Nonarray expressions that can be lvalues: 142 /// - name, where name must be a variable 143 /// - e[i] 144 /// - (e), where e must be an lvalue 145 /// - e.name, where e must be an lvalue 146 /// - e->name 147 /// - *e, the type of e cannot be a function type 148 /// - string-constant 149 /// - reference type [C++ [expr]] 150 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 151 /// 152 enum isLvalueResult { 153 LV_Valid, 154 LV_NotObjectType, 155 LV_IncompleteVoidType, 156 LV_DuplicateVectorComponents, 157 LV_InvalidExpression, 158 LV_MemberFunction 159 }; 160 isLvalueResult isLvalue(ASTContext &Ctx) const; 161 162 // Same as above, but excluding checks for non-object and void types in C 163 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 164 165 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 166 /// does not have an incomplete type, does not have a const-qualified type, 167 /// and if it is a structure or union, does not have any member (including, 168 /// recursively, any member or element of all contained aggregates or unions) 169 /// with a const-qualified type. 170 /// 171 /// \param Loc [in] [out] - A source location which *may* be filled 172 /// in with the location of the expression making this a 173 /// non-modifiable lvalue, if specified. 174 enum isModifiableLvalueResult { 175 MLV_Valid, 176 MLV_NotObjectType, 177 MLV_IncompleteVoidType, 178 MLV_DuplicateVectorComponents, 179 MLV_InvalidExpression, 180 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 181 MLV_IncompleteType, 182 MLV_ConstQualified, 183 MLV_ArrayType, 184 MLV_NotBlockQualified, 185 MLV_ReadonlyProperty, 186 MLV_NoSetterProperty, 187 MLV_MemberFunction 188 }; 189 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 190 SourceLocation *Loc = 0) const; 191 192 /// \brief If this expression refers to a bit-field, retrieve the 193 /// declaration of that bit-field. 194 FieldDecl *getBitField(); 195 196 const FieldDecl *getBitField() const { 197 return const_cast<Expr*>(this)->getBitField(); 198 } 199 200 /// isIntegerConstantExpr - Return true if this expression is a valid integer 201 /// constant expression, and, if so, return its value in Result. If not a 202 /// valid i-c-e, return false and fill in Loc (if specified) with the location 203 /// of the invalid expression. 204 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 205 SourceLocation *Loc = 0, 206 bool isEvaluated = true) const; 207 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 208 llvm::APSInt X; 209 return isIntegerConstantExpr(X, Ctx, Loc); 210 } 211 /// isConstantInitializer - Returns true if this expression is a constant 212 /// initializer, which can be emitted at compile-time. 213 bool isConstantInitializer(ASTContext &Ctx) const; 214 215 /// EvalResult is a struct with detailed info about an evaluated expression. 216 struct EvalResult { 217 /// Val - This is the value the expression can be folded to. 218 APValue Val; 219 220 /// HasSideEffects - Whether the evaluated expression has side effects. 221 /// For example, (f() && 0) can be folded, but it still has side effects. 222 bool HasSideEffects; 223 224 /// Diag - If the expression is unfoldable, then Diag contains a note 225 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 226 /// position for the error, and DiagExpr is the expression that caused 227 /// the error. 228 /// If the expression is foldable, but not an integer constant expression, 229 /// Diag contains a note diagnostic that describes why it isn't an integer 230 /// constant expression. If the expression *is* an integer constant 231 /// expression, then Diag will be zero. 232 unsigned Diag; 233 const Expr *DiagExpr; 234 SourceLocation DiagLoc; 235 236 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 237 }; 238 239 /// Evaluate - Return true if this is a constant which we can fold using 240 /// any crazy technique (that has nothing to do with language standards) that 241 /// we want to. If this function returns true, it returns the folded constant 242 /// in Result. 243 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 244 245 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 246 /// stack based objects. 247 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 248 249 /// isEvaluatable - Call Evaluate to see if this expression can be constant 250 /// folded, but discard the result. 251 bool isEvaluatable(ASTContext &Ctx) const; 252 253 bool HasSideEffects(ASTContext &Ctx) const; 254 255 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 256 /// must be called on an expression that constant folds to an integer. 257 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 258 259 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 260 /// with link time known address. 261 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 262 263 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 264 /// also succeeds on stack based, immutable address lvalues. 265 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 266 267 /// \brief Enumeration used to describe how \c isNullPointerConstant() 268 /// should cope with value-dependent expressions. 269 enum NullPointerConstantValueDependence { 270 /// \brief Specifies that the expression should never be value-dependent. 271 NPC_NeverValueDependent = 0, 272 273 /// \brief Specifies that a value-dependent expression of integral or 274 /// dependent type should be considered a null pointer constant. 275 NPC_ValueDependentIsNull, 276 277 /// \brief Specifies that a value-dependent expression should be considered 278 /// to never be a null pointer constant. 279 NPC_ValueDependentIsNotNull 280 }; 281 282 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 283 /// integer constant expression with the value zero, or if this is one that is 284 /// cast to void*. 285 bool isNullPointerConstant(ASTContext &Ctx, 286 NullPointerConstantValueDependence NPC) const; 287 288 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 289 /// write barrier. 290 bool isOBJCGCCandidate(ASTContext &Ctx) const; 291 292 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 293 /// its subexpression. If that subexpression is also a ParenExpr, 294 /// then this method recursively returns its subexpression, and so forth. 295 /// Otherwise, the method returns the current Expr. 296 Expr* IgnoreParens(); 297 298 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 299 /// or CastExprs, returning their operand. 300 Expr *IgnoreParenCasts(); 301 302 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 303 /// value (including ptr->int casts of the same size). Strip off any 304 /// ParenExpr or CastExprs, returning their operand. 305 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 306 307 const Expr* IgnoreParens() const { 308 return const_cast<Expr*>(this)->IgnoreParens(); 309 } 310 const Expr *IgnoreParenCasts() const { 311 return const_cast<Expr*>(this)->IgnoreParenCasts(); 312 } 313 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 314 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 315 } 316 317 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 318 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 319 320 static bool classof(const Stmt *T) { 321 return T->getStmtClass() >= firstExprConstant && 322 T->getStmtClass() <= lastExprConstant; 323 } 324 static bool classof(const Expr *) { return true; } 325}; 326 327 328//===----------------------------------------------------------------------===// 329// Primary Expressions. 330//===----------------------------------------------------------------------===// 331 332/// \brief Represents the qualifier that may precede a C++ name, e.g., the 333/// "std::" in "std::sort". 334struct NameQualifier { 335 /// \brief The nested name specifier. 336 NestedNameSpecifier *NNS; 337 338 /// \brief The source range covered by the nested name specifier. 339 SourceRange Range; 340}; 341 342/// \brief Represents an explicit template argument list in C++, e.g., 343/// the "<int>" in "sort<int>". 344struct ExplicitTemplateArgumentList { 345 /// \brief The source location of the left angle bracket ('<'); 346 SourceLocation LAngleLoc; 347 348 /// \brief The source location of the right angle bracket ('>'); 349 SourceLocation RAngleLoc; 350 351 /// \brief The number of template arguments in TemplateArgs. 352 /// The actual template arguments (if any) are stored after the 353 /// ExplicitTemplateArgumentList structure. 354 unsigned NumTemplateArgs; 355 356 /// \brief Retrieve the template arguments 357 TemplateArgumentLoc *getTemplateArgs() { 358 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 359 } 360 361 /// \brief Retrieve the template arguments 362 const TemplateArgumentLoc *getTemplateArgs() const { 363 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 364 } 365}; 366 367/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 368/// enum, etc. 369class DeclRefExpr : public Expr { 370 enum { 371 // Flag on DecoratedD that specifies when this declaration reference 372 // expression has a C++ nested-name-specifier. 373 HasQualifierFlag = 0x01, 374 // Flag on DecoratedD that specifies when this declaration reference 375 // expression has an explicit C++ template argument list. 376 HasExplicitTemplateArgumentListFlag = 0x02 377 }; 378 379 // DecoratedD - The declaration that we are referencing, plus two bits to 380 // indicate whether (1) the declaration's name was explicitly qualified and 381 // (2) the declaration's name was followed by an explicit template 382 // argument list. 383 llvm::PointerIntPair<NamedDecl *, 2> DecoratedD; 384 385 // Loc - The location of the declaration name itself. 386 SourceLocation Loc; 387 388 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 389 NameQualifier *getNameQualifier() { 390 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 391 return 0; 392 393 return reinterpret_cast<NameQualifier *> (this + 1); 394 } 395 396 /// \brief Retrieve the qualifier that preceded the member name, if any. 397 const NameQualifier *getNameQualifier() const { 398 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 399 } 400 401 /// \brief Retrieve the explicit template argument list that followed the 402 /// member template name, if any. 403 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 404 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 405 return 0; 406 407 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 408 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 409 410 return reinterpret_cast<ExplicitTemplateArgumentList *>( 411 getNameQualifier() + 1); 412 } 413 414 /// \brief Retrieve the explicit template argument list that followed the 415 /// member template name, if any. 416 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 417 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 418 } 419 420 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 421 NamedDecl *D, SourceLocation NameLoc, 422 bool HasExplicitTemplateArgumentList, 423 SourceLocation LAngleLoc, 424 const TemplateArgumentLoc *ExplicitTemplateArgs, 425 unsigned NumExplicitTemplateArgs, 426 SourceLocation RAngleLoc, 427 QualType T, bool TD, bool VD); 428 429protected: 430 // FIXME: Eventually, this constructor will go away and all subclasses 431 // will have to provide the type- and value-dependent flags. 432 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 433 Expr(SC, t), DecoratedD(d, 0), Loc(l) {} 434 435 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 436 bool VD) : 437 Expr(SC, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 438 439public: 440 // FIXME: Eventually, this constructor will go away and all clients 441 // will have to provide the type- and value-dependent flags. 442 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 443 Expr(DeclRefExprClass, t), DecoratedD(d, 0), Loc(l) {} 444 445 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 446 Expr(DeclRefExprClass, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 447 448 /// \brief Construct an empty declaration reference expression. 449 explicit DeclRefExpr(EmptyShell Empty) 450 : Expr(DeclRefExprClass, Empty) { } 451 452 static DeclRefExpr *Create(ASTContext &Context, 453 NestedNameSpecifier *Qualifier, 454 SourceRange QualifierRange, 455 NamedDecl *D, 456 SourceLocation NameLoc, 457 QualType T, bool TD, bool VD); 458 459 static DeclRefExpr *Create(ASTContext &Context, 460 NestedNameSpecifier *Qualifier, 461 SourceRange QualifierRange, 462 NamedDecl *D, 463 SourceLocation NameLoc, 464 bool HasExplicitTemplateArgumentList, 465 SourceLocation LAngleLoc, 466 const TemplateArgumentLoc *ExplicitTemplateArgs, 467 unsigned NumExplicitTemplateArgs, 468 SourceLocation RAngleLoc, 469 QualType T, bool TD, bool VD); 470 471 NamedDecl *getDecl() { return DecoratedD.getPointer(); } 472 const NamedDecl *getDecl() const { return DecoratedD.getPointer(); } 473 void setDecl(NamedDecl *NewD) { DecoratedD.setPointer(NewD); } 474 475 SourceLocation getLocation() const { return Loc; } 476 void setLocation(SourceLocation L) { Loc = L; } 477 virtual SourceRange getSourceRange() const; 478 479 /// \brief Determine whether this declaration reference was preceded by a 480 /// C++ nested-name-specifier, e.g., \c N::foo. 481 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 482 483 /// \brief If the name was qualified, retrieves the source range of 484 /// the nested-name-specifier that precedes the name. Otherwise, 485 /// returns an empty source range. 486 SourceRange getQualifierRange() const { 487 if (!hasQualifier()) 488 return SourceRange(); 489 490 return getNameQualifier()->Range; 491 } 492 493 /// \brief If the name was qualified, retrieves the nested-name-specifier 494 /// that precedes the name. Otherwise, returns NULL. 495 NestedNameSpecifier *getQualifier() const { 496 if (!hasQualifier()) 497 return 0; 498 499 return getNameQualifier()->NNS; 500 } 501 502 /// \brief Determines whether this member expression actually had a C++ 503 /// template argument list explicitly specified, e.g., x.f<int>. 504 bool hasExplicitTemplateArgumentList() const { 505 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 506 } 507 508 /// \brief Retrieve the location of the left angle bracket following the 509 /// member name ('<'), if any. 510 SourceLocation getLAngleLoc() const { 511 if (!hasExplicitTemplateArgumentList()) 512 return SourceLocation(); 513 514 return getExplicitTemplateArgumentList()->LAngleLoc; 515 } 516 517 /// \brief Retrieve the template arguments provided as part of this 518 /// template-id. 519 const TemplateArgumentLoc *getTemplateArgs() const { 520 if (!hasExplicitTemplateArgumentList()) 521 return 0; 522 523 return getExplicitTemplateArgumentList()->getTemplateArgs(); 524 } 525 526 /// \brief Retrieve the number of template arguments provided as part of this 527 /// template-id. 528 unsigned getNumTemplateArgs() const { 529 if (!hasExplicitTemplateArgumentList()) 530 return 0; 531 532 return getExplicitTemplateArgumentList()->NumTemplateArgs; 533 } 534 535 /// \brief Retrieve the location of the right angle bracket following the 536 /// template arguments ('>'). 537 SourceLocation getRAngleLoc() const { 538 if (!hasExplicitTemplateArgumentList()) 539 return SourceLocation(); 540 541 return getExplicitTemplateArgumentList()->RAngleLoc; 542 } 543 544 static bool classof(const Stmt *T) { 545 return T->getStmtClass() == DeclRefExprClass || 546 T->getStmtClass() == CXXConditionDeclExprClass; 547 } 548 static bool classof(const DeclRefExpr *) { return true; } 549 550 // Iterators 551 virtual child_iterator child_begin(); 552 virtual child_iterator child_end(); 553}; 554 555/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 556class PredefinedExpr : public Expr { 557public: 558 enum IdentType { 559 Func, 560 Function, 561 PrettyFunction 562 }; 563 564private: 565 SourceLocation Loc; 566 IdentType Type; 567public: 568 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 569 : Expr(PredefinedExprClass, type, type->isDependentType(), 570 type->isDependentType()), Loc(l), Type(IT) {} 571 572 /// \brief Construct an empty predefined expression. 573 explicit PredefinedExpr(EmptyShell Empty) 574 : Expr(PredefinedExprClass, Empty) { } 575 576 IdentType getIdentType() const { return Type; } 577 void setIdentType(IdentType IT) { Type = IT; } 578 579 SourceLocation getLocation() const { return Loc; } 580 void setLocation(SourceLocation L) { Loc = L; } 581 582 static std::string ComputeName(ASTContext &Context, IdentType IT, 583 const Decl *CurrentDecl); 584 585 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 586 587 static bool classof(const Stmt *T) { 588 return T->getStmtClass() == PredefinedExprClass; 589 } 590 static bool classof(const PredefinedExpr *) { return true; } 591 592 // Iterators 593 virtual child_iterator child_begin(); 594 virtual child_iterator child_end(); 595}; 596 597class IntegerLiteral : public Expr { 598 llvm::APInt Value; 599 SourceLocation Loc; 600public: 601 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 602 // or UnsignedLongLongTy 603 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 604 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 605 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 606 } 607 608 /// \brief Construct an empty integer literal. 609 explicit IntegerLiteral(EmptyShell Empty) 610 : Expr(IntegerLiteralClass, Empty) { } 611 612 const llvm::APInt &getValue() const { return Value; } 613 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 614 615 /// \brief Retrieve the location of the literal. 616 SourceLocation getLocation() const { return Loc; } 617 618 void setValue(const llvm::APInt &Val) { Value = Val; } 619 void setLocation(SourceLocation Location) { Loc = Location; } 620 621 static bool classof(const Stmt *T) { 622 return T->getStmtClass() == IntegerLiteralClass; 623 } 624 static bool classof(const IntegerLiteral *) { return true; } 625 626 // Iterators 627 virtual child_iterator child_begin(); 628 virtual child_iterator child_end(); 629}; 630 631class CharacterLiteral : public Expr { 632 unsigned Value; 633 SourceLocation Loc; 634 bool IsWide; 635public: 636 // type should be IntTy 637 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 638 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 639 } 640 641 /// \brief Construct an empty character literal. 642 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 643 644 SourceLocation getLocation() const { return Loc; } 645 bool isWide() const { return IsWide; } 646 647 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 648 649 unsigned getValue() const { return Value; } 650 651 void setLocation(SourceLocation Location) { Loc = Location; } 652 void setWide(bool W) { IsWide = W; } 653 void setValue(unsigned Val) { Value = Val; } 654 655 static bool classof(const Stmt *T) { 656 return T->getStmtClass() == CharacterLiteralClass; 657 } 658 static bool classof(const CharacterLiteral *) { return true; } 659 660 // Iterators 661 virtual child_iterator child_begin(); 662 virtual child_iterator child_end(); 663}; 664 665class FloatingLiteral : public Expr { 666 llvm::APFloat Value; 667 bool IsExact : 1; 668 SourceLocation Loc; 669public: 670 FloatingLiteral(const llvm::APFloat &V, bool isexact, 671 QualType Type, SourceLocation L) 672 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 673 674 /// \brief Construct an empty floating-point literal. 675 explicit FloatingLiteral(EmptyShell Empty) 676 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 677 678 const llvm::APFloat &getValue() const { return Value; } 679 void setValue(const llvm::APFloat &Val) { Value = Val; } 680 681 bool isExact() const { return IsExact; } 682 void setExact(bool E) { IsExact = E; } 683 684 /// getValueAsApproximateDouble - This returns the value as an inaccurate 685 /// double. Note that this may cause loss of precision, but is useful for 686 /// debugging dumps, etc. 687 double getValueAsApproximateDouble() const; 688 689 SourceLocation getLocation() const { return Loc; } 690 void setLocation(SourceLocation L) { Loc = L; } 691 692 // FIXME: The logic for computing the value of a predefined expr should go 693 // into a method here that takes the inner-most code decl (a block, function 694 // or objc method) that the expr lives in. This would allow sema and codegen 695 // to be consistent for things like sizeof(__func__) etc. 696 697 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 698 699 static bool classof(const Stmt *T) { 700 return T->getStmtClass() == FloatingLiteralClass; 701 } 702 static bool classof(const FloatingLiteral *) { return true; } 703 704 // Iterators 705 virtual child_iterator child_begin(); 706 virtual child_iterator child_end(); 707}; 708 709/// ImaginaryLiteral - We support imaginary integer and floating point literals, 710/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 711/// IntegerLiteral classes. Instances of this class always have a Complex type 712/// whose element type matches the subexpression. 713/// 714class ImaginaryLiteral : public Expr { 715 Stmt *Val; 716public: 717 ImaginaryLiteral(Expr *val, QualType Ty) 718 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 719 720 /// \brief Build an empty imaginary literal. 721 explicit ImaginaryLiteral(EmptyShell Empty) 722 : Expr(ImaginaryLiteralClass, Empty) { } 723 724 const Expr *getSubExpr() const { return cast<Expr>(Val); } 725 Expr *getSubExpr() { return cast<Expr>(Val); } 726 void setSubExpr(Expr *E) { Val = E; } 727 728 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 729 static bool classof(const Stmt *T) { 730 return T->getStmtClass() == ImaginaryLiteralClass; 731 } 732 static bool classof(const ImaginaryLiteral *) { return true; } 733 734 // Iterators 735 virtual child_iterator child_begin(); 736 virtual child_iterator child_end(); 737}; 738 739/// StringLiteral - This represents a string literal expression, e.g. "foo" 740/// or L"bar" (wide strings). The actual string is returned by getStrData() 741/// is NOT null-terminated, and the length of the string is determined by 742/// calling getByteLength(). The C type for a string is always a 743/// ConstantArrayType. In C++, the char type is const qualified, in C it is 744/// not. 745/// 746/// Note that strings in C can be formed by concatenation of multiple string 747/// literal pptokens in translation phase #6. This keeps track of the locations 748/// of each of these pieces. 749/// 750/// Strings in C can also be truncated and extended by assigning into arrays, 751/// e.g. with constructs like: 752/// char X[2] = "foobar"; 753/// In this case, getByteLength() will return 6, but the string literal will 754/// have type "char[2]". 755class StringLiteral : public Expr { 756 const char *StrData; 757 unsigned ByteLength; 758 bool IsWide; 759 unsigned NumConcatenated; 760 SourceLocation TokLocs[1]; 761 762 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 763 764protected: 765 virtual void DoDestroy(ASTContext &C); 766 767public: 768 /// This is the "fully general" constructor that allows representation of 769 /// strings formed from multiple concatenated tokens. 770 static StringLiteral *Create(ASTContext &C, const char *StrData, 771 unsigned ByteLength, bool Wide, QualType Ty, 772 const SourceLocation *Loc, unsigned NumStrs); 773 774 /// Simple constructor for string literals made from one token. 775 static StringLiteral *Create(ASTContext &C, const char *StrData, 776 unsigned ByteLength, 777 bool Wide, QualType Ty, SourceLocation Loc) { 778 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 779 } 780 781 /// \brief Construct an empty string literal. 782 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 783 784 llvm::StringRef getString() const { 785 return llvm::StringRef(StrData, ByteLength); 786 } 787 // FIXME: These are deprecated, replace with StringRef. 788 const char *getStrData() const { return StrData; } 789 unsigned getByteLength() const { return ByteLength; } 790 791 /// \brief Sets the string data to the given string data. 792 void setString(ASTContext &C, llvm::StringRef Str); 793 794 bool isWide() const { return IsWide; } 795 void setWide(bool W) { IsWide = W; } 796 797 bool containsNonAsciiOrNull() const { 798 llvm::StringRef Str = getString(); 799 for (unsigned i = 0, e = Str.size(); i != e; ++i) 800 if (!isascii(Str[i]) || !Str[i]) 801 return true; 802 return false; 803 } 804 /// getNumConcatenated - Get the number of string literal tokens that were 805 /// concatenated in translation phase #6 to form this string literal. 806 unsigned getNumConcatenated() const { return NumConcatenated; } 807 808 SourceLocation getStrTokenLoc(unsigned TokNum) const { 809 assert(TokNum < NumConcatenated && "Invalid tok number"); 810 return TokLocs[TokNum]; 811 } 812 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 813 assert(TokNum < NumConcatenated && "Invalid tok number"); 814 TokLocs[TokNum] = L; 815 } 816 817 typedef const SourceLocation *tokloc_iterator; 818 tokloc_iterator tokloc_begin() const { return TokLocs; } 819 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 820 821 virtual SourceRange getSourceRange() const { 822 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 823 } 824 static bool classof(const Stmt *T) { 825 return T->getStmtClass() == StringLiteralClass; 826 } 827 static bool classof(const StringLiteral *) { return true; } 828 829 // Iterators 830 virtual child_iterator child_begin(); 831 virtual child_iterator child_end(); 832}; 833 834/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 835/// AST node is only formed if full location information is requested. 836class ParenExpr : public Expr { 837 SourceLocation L, R; 838 Stmt *Val; 839public: 840 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 841 : Expr(ParenExprClass, val->getType(), 842 val->isTypeDependent(), val->isValueDependent()), 843 L(l), R(r), Val(val) {} 844 845 /// \brief Construct an empty parenthesized expression. 846 explicit ParenExpr(EmptyShell Empty) 847 : Expr(ParenExprClass, Empty) { } 848 849 const Expr *getSubExpr() const { return cast<Expr>(Val); } 850 Expr *getSubExpr() { return cast<Expr>(Val); } 851 void setSubExpr(Expr *E) { Val = E; } 852 853 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 854 855 /// \brief Get the location of the left parentheses '('. 856 SourceLocation getLParen() const { return L; } 857 void setLParen(SourceLocation Loc) { L = Loc; } 858 859 /// \brief Get the location of the right parentheses ')'. 860 SourceLocation getRParen() const { return R; } 861 void setRParen(SourceLocation Loc) { R = Loc; } 862 863 static bool classof(const Stmt *T) { 864 return T->getStmtClass() == ParenExprClass; 865 } 866 static bool classof(const ParenExpr *) { return true; } 867 868 // Iterators 869 virtual child_iterator child_begin(); 870 virtual child_iterator child_end(); 871}; 872 873 874/// UnaryOperator - This represents the unary-expression's (except sizeof and 875/// alignof), the postinc/postdec operators from postfix-expression, and various 876/// extensions. 877/// 878/// Notes on various nodes: 879/// 880/// Real/Imag - These return the real/imag part of a complex operand. If 881/// applied to a non-complex value, the former returns its operand and the 882/// later returns zero in the type of the operand. 883/// 884/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 885/// subexpression is a compound literal with the various MemberExpr and 886/// ArraySubscriptExpr's applied to it. 887/// 888class UnaryOperator : public Expr { 889public: 890 // Note that additions to this should also update the StmtVisitor class. 891 enum Opcode { 892 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 893 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 894 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 895 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 896 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 897 Real, Imag, // "__real expr"/"__imag expr" Extension. 898 Extension, // __extension__ marker. 899 OffsetOf // __builtin_offsetof 900 }; 901private: 902 Stmt *Val; 903 Opcode Opc; 904 SourceLocation Loc; 905public: 906 907 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 908 : Expr(UnaryOperatorClass, type, 909 input->isTypeDependent() && opc != OffsetOf, 910 input->isValueDependent()), 911 Val(input), Opc(opc), Loc(l) {} 912 913 /// \brief Build an empty unary operator. 914 explicit UnaryOperator(EmptyShell Empty) 915 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 916 917 Opcode getOpcode() const { return Opc; } 918 void setOpcode(Opcode O) { Opc = O; } 919 920 Expr *getSubExpr() const { return cast<Expr>(Val); } 921 void setSubExpr(Expr *E) { Val = E; } 922 923 /// getOperatorLoc - Return the location of the operator. 924 SourceLocation getOperatorLoc() const { return Loc; } 925 void setOperatorLoc(SourceLocation L) { Loc = L; } 926 927 /// isPostfix - Return true if this is a postfix operation, like x++. 928 static bool isPostfix(Opcode Op) { 929 return Op == PostInc || Op == PostDec; 930 } 931 932 /// isPostfix - Return true if this is a prefix operation, like --x. 933 static bool isPrefix(Opcode Op) { 934 return Op == PreInc || Op == PreDec; 935 } 936 937 bool isPrefix() const { return isPrefix(Opc); } 938 bool isPostfix() const { return isPostfix(Opc); } 939 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 940 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 941 bool isOffsetOfOp() const { return Opc == OffsetOf; } 942 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 943 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 944 945 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 946 /// corresponds to, e.g. "sizeof" or "[pre]++" 947 static const char *getOpcodeStr(Opcode Op); 948 949 /// \brief Retrieve the unary opcode that corresponds to the given 950 /// overloaded operator. 951 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 952 953 /// \brief Retrieve the overloaded operator kind that corresponds to 954 /// the given unary opcode. 955 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 956 957 virtual SourceRange getSourceRange() const { 958 if (isPostfix()) 959 return SourceRange(Val->getLocStart(), Loc); 960 else 961 return SourceRange(Loc, Val->getLocEnd()); 962 } 963 virtual SourceLocation getExprLoc() const { return Loc; } 964 965 static bool classof(const Stmt *T) { 966 return T->getStmtClass() == UnaryOperatorClass; 967 } 968 static bool classof(const UnaryOperator *) { return true; } 969 970 // Iterators 971 virtual child_iterator child_begin(); 972 virtual child_iterator child_end(); 973}; 974 975/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 976/// types and expressions. 977class SizeOfAlignOfExpr : public Expr { 978 bool isSizeof : 1; // true if sizeof, false if alignof. 979 bool isType : 1; // true if operand is a type, false if an expression 980 union { 981 DeclaratorInfo *Ty; 982 Stmt *Ex; 983 } Argument; 984 SourceLocation OpLoc, RParenLoc; 985 986protected: 987 virtual void DoDestroy(ASTContext& C); 988 989public: 990 SizeOfAlignOfExpr(bool issizeof, DeclaratorInfo *DInfo, 991 QualType resultType, SourceLocation op, 992 SourceLocation rp) : 993 Expr(SizeOfAlignOfExprClass, resultType, 994 false, // Never type-dependent (C++ [temp.dep.expr]p3). 995 // Value-dependent if the argument is type-dependent. 996 DInfo->getType()->isDependentType()), 997 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 998 Argument.Ty = DInfo; 999 } 1000 1001 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1002 QualType resultType, SourceLocation op, 1003 SourceLocation rp) : 1004 Expr(SizeOfAlignOfExprClass, resultType, 1005 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1006 // Value-dependent if the argument is type-dependent. 1007 E->isTypeDependent()), 1008 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1009 Argument.Ex = E; 1010 } 1011 1012 /// \brief Construct an empty sizeof/alignof expression. 1013 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1014 : Expr(SizeOfAlignOfExprClass, Empty) { } 1015 1016 bool isSizeOf() const { return isSizeof; } 1017 void setSizeof(bool S) { isSizeof = S; } 1018 1019 bool isArgumentType() const { return isType; } 1020 QualType getArgumentType() const { 1021 return getArgumentTypeInfo()->getType(); 1022 } 1023 DeclaratorInfo *getArgumentTypeInfo() const { 1024 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1025 return Argument.Ty; 1026 } 1027 Expr *getArgumentExpr() { 1028 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1029 return static_cast<Expr*>(Argument.Ex); 1030 } 1031 const Expr *getArgumentExpr() const { 1032 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1033 } 1034 1035 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1036 void setArgument(DeclaratorInfo *DInfo) { 1037 Argument.Ty = DInfo; 1038 isType = true; 1039 } 1040 1041 /// Gets the argument type, or the type of the argument expression, whichever 1042 /// is appropriate. 1043 QualType getTypeOfArgument() const { 1044 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1045 } 1046 1047 SourceLocation getOperatorLoc() const { return OpLoc; } 1048 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1049 1050 SourceLocation getRParenLoc() const { return RParenLoc; } 1051 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1052 1053 virtual SourceRange getSourceRange() const { 1054 return SourceRange(OpLoc, RParenLoc); 1055 } 1056 1057 static bool classof(const Stmt *T) { 1058 return T->getStmtClass() == SizeOfAlignOfExprClass; 1059 } 1060 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1061 1062 // Iterators 1063 virtual child_iterator child_begin(); 1064 virtual child_iterator child_end(); 1065}; 1066 1067//===----------------------------------------------------------------------===// 1068// Postfix Operators. 1069//===----------------------------------------------------------------------===// 1070 1071/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1072class ArraySubscriptExpr : public Expr { 1073 enum { LHS, RHS, END_EXPR=2 }; 1074 Stmt* SubExprs[END_EXPR]; 1075 SourceLocation RBracketLoc; 1076public: 1077 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1078 SourceLocation rbracketloc) 1079 : Expr(ArraySubscriptExprClass, t, 1080 lhs->isTypeDependent() || rhs->isTypeDependent(), 1081 lhs->isValueDependent() || rhs->isValueDependent()), 1082 RBracketLoc(rbracketloc) { 1083 SubExprs[LHS] = lhs; 1084 SubExprs[RHS] = rhs; 1085 } 1086 1087 /// \brief Create an empty array subscript expression. 1088 explicit ArraySubscriptExpr(EmptyShell Shell) 1089 : Expr(ArraySubscriptExprClass, Shell) { } 1090 1091 /// An array access can be written A[4] or 4[A] (both are equivalent). 1092 /// - getBase() and getIdx() always present the normalized view: A[4]. 1093 /// In this case getBase() returns "A" and getIdx() returns "4". 1094 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1095 /// 4[A] getLHS() returns "4". 1096 /// Note: Because vector element access is also written A[4] we must 1097 /// predicate the format conversion in getBase and getIdx only on the 1098 /// the type of the RHS, as it is possible for the LHS to be a vector of 1099 /// integer type 1100 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1101 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1102 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1103 1104 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1105 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1106 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1107 1108 Expr *getBase() { 1109 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1110 } 1111 1112 const Expr *getBase() const { 1113 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1114 } 1115 1116 Expr *getIdx() { 1117 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1118 } 1119 1120 const Expr *getIdx() const { 1121 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1122 } 1123 1124 virtual SourceRange getSourceRange() const { 1125 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1126 } 1127 1128 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1129 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1130 1131 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1132 1133 static bool classof(const Stmt *T) { 1134 return T->getStmtClass() == ArraySubscriptExprClass; 1135 } 1136 static bool classof(const ArraySubscriptExpr *) { return true; } 1137 1138 // Iterators 1139 virtual child_iterator child_begin(); 1140 virtual child_iterator child_end(); 1141}; 1142 1143 1144/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1145/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1146/// while its subclasses may represent alternative syntax that (semantically) 1147/// results in a function call. For example, CXXOperatorCallExpr is 1148/// a subclass for overloaded operator calls that use operator syntax, e.g., 1149/// "str1 + str2" to resolve to a function call. 1150class CallExpr : public Expr { 1151 enum { FN=0, ARGS_START=1 }; 1152 Stmt **SubExprs; 1153 unsigned NumArgs; 1154 SourceLocation RParenLoc; 1155 1156protected: 1157 // This version of the constructor is for derived classes. 1158 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1159 QualType t, SourceLocation rparenloc); 1160 1161 virtual void DoDestroy(ASTContext& C); 1162 1163public: 1164 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1165 SourceLocation rparenloc); 1166 1167 /// \brief Build an empty call expression. 1168 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1169 1170 ~CallExpr() {} 1171 1172 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1173 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1174 void setCallee(Expr *F) { SubExprs[FN] = F; } 1175 1176 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1177 FunctionDecl *getDirectCallee(); 1178 const FunctionDecl *getDirectCallee() const { 1179 return const_cast<CallExpr*>(this)->getDirectCallee(); 1180 } 1181 1182 /// getNumArgs - Return the number of actual arguments to this call. 1183 /// 1184 unsigned getNumArgs() const { return NumArgs; } 1185 1186 /// getArg - Return the specified argument. 1187 Expr *getArg(unsigned Arg) { 1188 assert(Arg < NumArgs && "Arg access out of range!"); 1189 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1190 } 1191 const Expr *getArg(unsigned Arg) const { 1192 assert(Arg < NumArgs && "Arg access out of range!"); 1193 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1194 } 1195 1196 /// setArg - Set the specified argument. 1197 void setArg(unsigned Arg, Expr *ArgExpr) { 1198 assert(Arg < NumArgs && "Arg access out of range!"); 1199 SubExprs[Arg+ARGS_START] = ArgExpr; 1200 } 1201 1202 /// setNumArgs - This changes the number of arguments present in this call. 1203 /// Any orphaned expressions are deleted by this, and any new operands are set 1204 /// to null. 1205 void setNumArgs(ASTContext& C, unsigned NumArgs); 1206 1207 typedef ExprIterator arg_iterator; 1208 typedef ConstExprIterator const_arg_iterator; 1209 1210 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1211 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1212 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1213 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1214 1215 /// getNumCommas - Return the number of commas that must have been present in 1216 /// this function call. 1217 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1218 1219 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1220 /// not, return 0. 1221 unsigned isBuiltinCall(ASTContext &Context) const; 1222 1223 /// getCallReturnType - Get the return type of the call expr. This is not 1224 /// always the type of the expr itself, if the return type is a reference 1225 /// type. 1226 QualType getCallReturnType() const; 1227 1228 SourceLocation getRParenLoc() const { return RParenLoc; } 1229 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1230 1231 virtual SourceRange getSourceRange() const { 1232 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1233 } 1234 1235 static bool classof(const Stmt *T) { 1236 return T->getStmtClass() == CallExprClass || 1237 T->getStmtClass() == CXXOperatorCallExprClass || 1238 T->getStmtClass() == CXXMemberCallExprClass; 1239 } 1240 static bool classof(const CallExpr *) { return true; } 1241 static bool classof(const CXXOperatorCallExpr *) { return true; } 1242 static bool classof(const CXXMemberCallExpr *) { return true; } 1243 1244 // Iterators 1245 virtual child_iterator child_begin(); 1246 virtual child_iterator child_end(); 1247}; 1248 1249/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1250/// 1251class MemberExpr : public Expr { 1252 /// Base - the expression for the base pointer or structure references. In 1253 /// X.F, this is "X". 1254 Stmt *Base; 1255 1256 /// MemberDecl - This is the decl being referenced by the field/member name. 1257 /// In X.F, this is the decl referenced by F. 1258 NamedDecl *MemberDecl; 1259 1260 /// MemberLoc - This is the location of the member name. 1261 SourceLocation MemberLoc; 1262 1263 /// IsArrow - True if this is "X->F", false if this is "X.F". 1264 bool IsArrow : 1; 1265 1266 /// \brief True if this member expression used a nested-name-specifier to 1267 /// refer to the member, e.g., "x->Base::f". When true, a NameQualifier 1268 /// structure is allocated immediately after the MemberExpr. 1269 bool HasQualifier : 1; 1270 1271 /// \brief True if this member expression specified a template argument list 1272 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1273 /// structure (and its TemplateArguments) are allocated immediately after 1274 /// the MemberExpr or, if the member expression also has a qualifier, after 1275 /// the NameQualifier structure. 1276 bool HasExplicitTemplateArgumentList : 1; 1277 1278 /// \brief Retrieve the qualifier that preceded the member name, if any. 1279 NameQualifier *getMemberQualifier() { 1280 if (!HasQualifier) 1281 return 0; 1282 1283 return reinterpret_cast<NameQualifier *> (this + 1); 1284 } 1285 1286 /// \brief Retrieve the qualifier that preceded the member name, if any. 1287 const NameQualifier *getMemberQualifier() const { 1288 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1289 } 1290 1291 /// \brief Retrieve the explicit template argument list that followed the 1292 /// member template name, if any. 1293 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1294 if (!HasExplicitTemplateArgumentList) 1295 return 0; 1296 1297 if (!HasQualifier) 1298 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1299 1300 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1301 getMemberQualifier() + 1); 1302 } 1303 1304 /// \brief Retrieve the explicit template argument list that followed the 1305 /// member template name, if any. 1306 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1307 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1308 } 1309 1310 MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 1311 SourceRange qualrange, NamedDecl *memberdecl, SourceLocation l, 1312 bool has_explicit, SourceLocation langle, 1313 const TemplateArgumentLoc *targs, unsigned numtargs, 1314 SourceLocation rangle, QualType ty); 1315 1316public: 1317 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1318 QualType ty) 1319 : Expr(MemberExprClass, ty, 1320 base->isTypeDependent(), base->isValueDependent()), 1321 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1322 HasQualifier(false), HasExplicitTemplateArgumentList(false) {} 1323 1324 /// \brief Build an empty member reference expression. 1325 explicit MemberExpr(EmptyShell Empty) 1326 : Expr(MemberExprClass, Empty), HasQualifier(false), 1327 HasExplicitTemplateArgumentList(false) { } 1328 1329 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1330 NestedNameSpecifier *qual, SourceRange qualrange, 1331 NamedDecl *memberdecl, 1332 SourceLocation l, 1333 bool has_explicit, 1334 SourceLocation langle, 1335 const TemplateArgumentLoc *targs, 1336 unsigned numtargs, 1337 SourceLocation rangle, 1338 QualType ty); 1339 1340 void setBase(Expr *E) { Base = E; } 1341 Expr *getBase() const { return cast<Expr>(Base); } 1342 1343 /// \brief Retrieve the member declaration to which this expression refers. 1344 /// 1345 /// The returned declaration will either be a FieldDecl or (in C++) 1346 /// a CXXMethodDecl. 1347 NamedDecl *getMemberDecl() const { return MemberDecl; } 1348 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1349 1350 /// \brief Determines whether this member expression actually had 1351 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1352 /// x->Base::foo. 1353 bool hasQualifier() const { return HasQualifier; } 1354 1355 /// \brief If the member name was qualified, retrieves the source range of 1356 /// the nested-name-specifier that precedes the member name. Otherwise, 1357 /// returns an empty source range. 1358 SourceRange getQualifierRange() const { 1359 if (!HasQualifier) 1360 return SourceRange(); 1361 1362 return getMemberQualifier()->Range; 1363 } 1364 1365 /// \brief If the member name was qualified, retrieves the 1366 /// nested-name-specifier that precedes the member name. Otherwise, returns 1367 /// NULL. 1368 NestedNameSpecifier *getQualifier() const { 1369 if (!HasQualifier) 1370 return 0; 1371 1372 return getMemberQualifier()->NNS; 1373 } 1374 1375 /// \brief Determines whether this member expression actually had a C++ 1376 /// template argument list explicitly specified, e.g., x.f<int>. 1377 bool hasExplicitTemplateArgumentList() { 1378 return HasExplicitTemplateArgumentList; 1379 } 1380 1381 /// \brief Retrieve the location of the left angle bracket following the 1382 /// member name ('<'), if any. 1383 SourceLocation getLAngleLoc() const { 1384 if (!HasExplicitTemplateArgumentList) 1385 return SourceLocation(); 1386 1387 return getExplicitTemplateArgumentList()->LAngleLoc; 1388 } 1389 1390 /// \brief Retrieve the template arguments provided as part of this 1391 /// template-id. 1392 const TemplateArgumentLoc *getTemplateArgs() const { 1393 if (!HasExplicitTemplateArgumentList) 1394 return 0; 1395 1396 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1397 } 1398 1399 /// \brief Retrieve the number of template arguments provided as part of this 1400 /// template-id. 1401 unsigned getNumTemplateArgs() const { 1402 if (!HasExplicitTemplateArgumentList) 1403 return 0; 1404 1405 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1406 } 1407 1408 /// \brief Retrieve the location of the right angle bracket following the 1409 /// template arguments ('>'). 1410 SourceLocation getRAngleLoc() const { 1411 if (!HasExplicitTemplateArgumentList) 1412 return SourceLocation(); 1413 1414 return getExplicitTemplateArgumentList()->RAngleLoc; 1415 } 1416 1417 bool isArrow() const { return IsArrow; } 1418 void setArrow(bool A) { IsArrow = A; } 1419 1420 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1421 /// location of 'F'. 1422 SourceLocation getMemberLoc() const { return MemberLoc; } 1423 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1424 1425 virtual SourceRange getSourceRange() const { 1426 // If we have an implicit base (like a C++ implicit this), 1427 // make sure not to return its location 1428 SourceLocation EndLoc = MemberLoc; 1429 if (HasExplicitTemplateArgumentList) 1430 EndLoc = getRAngleLoc(); 1431 1432 SourceLocation BaseLoc = getBase()->getLocStart(); 1433 if (BaseLoc.isInvalid()) 1434 return SourceRange(MemberLoc, EndLoc); 1435 return SourceRange(BaseLoc, EndLoc); 1436 } 1437 1438 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1439 1440 static bool classof(const Stmt *T) { 1441 return T->getStmtClass() == MemberExprClass; 1442 } 1443 static bool classof(const MemberExpr *) { return true; } 1444 1445 // Iterators 1446 virtual child_iterator child_begin(); 1447 virtual child_iterator child_end(); 1448}; 1449 1450/// CompoundLiteralExpr - [C99 6.5.2.5] 1451/// 1452class CompoundLiteralExpr : public Expr { 1453 /// LParenLoc - If non-null, this is the location of the left paren in a 1454 /// compound literal like "(int){4}". This can be null if this is a 1455 /// synthesized compound expression. 1456 SourceLocation LParenLoc; 1457 Stmt *Init; 1458 bool FileScope; 1459public: 1460 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1461 bool fileScope) 1462 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1463 FileScope(fileScope) {} 1464 1465 /// \brief Construct an empty compound literal. 1466 explicit CompoundLiteralExpr(EmptyShell Empty) 1467 : Expr(CompoundLiteralExprClass, Empty) { } 1468 1469 const Expr *getInitializer() const { return cast<Expr>(Init); } 1470 Expr *getInitializer() { return cast<Expr>(Init); } 1471 void setInitializer(Expr *E) { Init = E; } 1472 1473 bool isFileScope() const { return FileScope; } 1474 void setFileScope(bool FS) { FileScope = FS; } 1475 1476 SourceLocation getLParenLoc() const { return LParenLoc; } 1477 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1478 1479 virtual SourceRange getSourceRange() const { 1480 // FIXME: Init should never be null. 1481 if (!Init) 1482 return SourceRange(); 1483 if (LParenLoc.isInvalid()) 1484 return Init->getSourceRange(); 1485 return SourceRange(LParenLoc, Init->getLocEnd()); 1486 } 1487 1488 static bool classof(const Stmt *T) { 1489 return T->getStmtClass() == CompoundLiteralExprClass; 1490 } 1491 static bool classof(const CompoundLiteralExpr *) { return true; } 1492 1493 // Iterators 1494 virtual child_iterator child_begin(); 1495 virtual child_iterator child_end(); 1496}; 1497 1498/// CastExpr - Base class for type casts, including both implicit 1499/// casts (ImplicitCastExpr) and explicit casts that have some 1500/// representation in the source code (ExplicitCastExpr's derived 1501/// classes). 1502class CastExpr : public Expr { 1503public: 1504 /// CastKind - the kind of cast this represents. 1505 enum CastKind { 1506 /// CK_Unknown - Unknown cast kind. 1507 /// FIXME: The goal is to get rid of this and make all casts have a 1508 /// kind so that the AST client doesn't have to try to figure out what's 1509 /// going on. 1510 CK_Unknown, 1511 1512 /// CK_BitCast - Used for reinterpret_cast. 1513 CK_BitCast, 1514 1515 /// CK_NoOp - Used for const_cast. 1516 CK_NoOp, 1517 1518 /// CK_DerivedToBase - Derived to base class casts. 1519 CK_DerivedToBase, 1520 1521 /// CK_Dynamic - Dynamic cast. 1522 CK_Dynamic, 1523 1524 /// CK_ToUnion - Cast to union (GCC extension). 1525 CK_ToUnion, 1526 1527 /// CK_ArrayToPointerDecay - Array to pointer decay. 1528 CK_ArrayToPointerDecay, 1529 1530 // CK_FunctionToPointerDecay - Function to pointer decay. 1531 CK_FunctionToPointerDecay, 1532 1533 /// CK_NullToMemberPointer - Null pointer to member pointer. 1534 CK_NullToMemberPointer, 1535 1536 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1537 /// member pointer in derived class. 1538 CK_BaseToDerivedMemberPointer, 1539 1540 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1541 /// member pointer in base class. 1542 CK_DerivedToBaseMemberPointer, 1543 1544 /// CK_UserDefinedConversion - Conversion using a user defined type 1545 /// conversion function. 1546 CK_UserDefinedConversion, 1547 1548 /// CK_ConstructorConversion - Conversion by constructor 1549 CK_ConstructorConversion, 1550 1551 /// CK_IntegralToPointer - Integral to pointer 1552 CK_IntegralToPointer, 1553 1554 /// CK_PointerToIntegral - Pointer to integral 1555 CK_PointerToIntegral, 1556 1557 /// CK_ToVoid - Cast to void. 1558 CK_ToVoid, 1559 1560 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1561 /// vector type with the same element type as the src type. Splats the 1562 /// src expression into the destination expression. 1563 CK_VectorSplat, 1564 1565 /// CK_IntegralCast - Casting between integral types of different size. 1566 CK_IntegralCast, 1567 1568 /// CK_IntegralToFloating - Integral to floating point. 1569 CK_IntegralToFloating, 1570 1571 /// CK_FloatingToIntegral - Floating point to integral. 1572 CK_FloatingToIntegral, 1573 1574 /// CK_FloatingCast - Casting between floating types of different size. 1575 CK_FloatingCast 1576 }; 1577 1578private: 1579 CastKind Kind; 1580 Stmt *Op; 1581protected: 1582 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op) : 1583 Expr(SC, ty, 1584 // Cast expressions are type-dependent if the type is 1585 // dependent (C++ [temp.dep.expr]p3). 1586 ty->isDependentType(), 1587 // Cast expressions are value-dependent if the type is 1588 // dependent or if the subexpression is value-dependent. 1589 ty->isDependentType() || (op && op->isValueDependent())), 1590 Kind(kind), Op(op) {} 1591 1592 /// \brief Construct an empty cast. 1593 CastExpr(StmtClass SC, EmptyShell Empty) 1594 : Expr(SC, Empty) { } 1595 1596public: 1597 CastKind getCastKind() const { return Kind; } 1598 void setCastKind(CastKind K) { Kind = K; } 1599 const char *getCastKindName() const; 1600 1601 Expr *getSubExpr() { return cast<Expr>(Op); } 1602 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1603 void setSubExpr(Expr *E) { Op = E; } 1604 1605 static bool classof(const Stmt *T) { 1606 StmtClass SC = T->getStmtClass(); 1607 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1608 return true; 1609 1610 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1611 return true; 1612 1613 return false; 1614 } 1615 static bool classof(const CastExpr *) { return true; } 1616 1617 // Iterators 1618 virtual child_iterator child_begin(); 1619 virtual child_iterator child_end(); 1620}; 1621 1622/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1623/// conversions, which have no direct representation in the original 1624/// source code. For example: converting T[]->T*, void f()->void 1625/// (*f)(), float->double, short->int, etc. 1626/// 1627/// In C, implicit casts always produce rvalues. However, in C++, an 1628/// implicit cast whose result is being bound to a reference will be 1629/// an lvalue. For example: 1630/// 1631/// @code 1632/// class Base { }; 1633/// class Derived : public Base { }; 1634/// void f(Derived d) { 1635/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1636/// } 1637/// @endcode 1638class ImplicitCastExpr : public CastExpr { 1639 /// LvalueCast - Whether this cast produces an lvalue. 1640 bool LvalueCast; 1641 1642public: 1643 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1644 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1645 1646 /// \brief Construct an empty implicit cast. 1647 explicit ImplicitCastExpr(EmptyShell Shell) 1648 : CastExpr(ImplicitCastExprClass, Shell) { } 1649 1650 1651 virtual SourceRange getSourceRange() const { 1652 return getSubExpr()->getSourceRange(); 1653 } 1654 1655 /// isLvalueCast - Whether this cast produces an lvalue. 1656 bool isLvalueCast() const { return LvalueCast; } 1657 1658 /// setLvalueCast - Set whether this cast produces an lvalue. 1659 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1660 1661 static bool classof(const Stmt *T) { 1662 return T->getStmtClass() == ImplicitCastExprClass; 1663 } 1664 static bool classof(const ImplicitCastExpr *) { return true; } 1665}; 1666 1667/// ExplicitCastExpr - An explicit cast written in the source 1668/// code. 1669/// 1670/// This class is effectively an abstract class, because it provides 1671/// the basic representation of an explicitly-written cast without 1672/// specifying which kind of cast (C cast, functional cast, static 1673/// cast, etc.) was written; specific derived classes represent the 1674/// particular style of cast and its location information. 1675/// 1676/// Unlike implicit casts, explicit cast nodes have two different 1677/// types: the type that was written into the source code, and the 1678/// actual type of the expression as determined by semantic 1679/// analysis. These types may differ slightly. For example, in C++ one 1680/// can cast to a reference type, which indicates that the resulting 1681/// expression will be an lvalue. The reference type, however, will 1682/// not be used as the type of the expression. 1683class ExplicitCastExpr : public CastExpr { 1684 /// TypeAsWritten - The type that this expression is casting to, as 1685 /// written in the source code. 1686 QualType TypeAsWritten; 1687 1688protected: 1689 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1690 Expr *op, QualType writtenTy) 1691 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1692 1693 /// \brief Construct an empty explicit cast. 1694 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1695 : CastExpr(SC, Shell) { } 1696 1697public: 1698 /// getTypeAsWritten - Returns the type that this expression is 1699 /// casting to, as written in the source code. 1700 QualType getTypeAsWritten() const { return TypeAsWritten; } 1701 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1702 1703 static bool classof(const Stmt *T) { 1704 StmtClass SC = T->getStmtClass(); 1705 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1706 return true; 1707 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1708 return true; 1709 1710 return false; 1711 } 1712 static bool classof(const ExplicitCastExpr *) { return true; } 1713}; 1714 1715/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1716/// cast in C++ (C++ [expr.cast]), which uses the syntax 1717/// (Type)expr. For example: @c (int)f. 1718class CStyleCastExpr : public ExplicitCastExpr { 1719 SourceLocation LPLoc; // the location of the left paren 1720 SourceLocation RPLoc; // the location of the right paren 1721public: 1722 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1723 SourceLocation l, SourceLocation r) : 1724 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1725 LPLoc(l), RPLoc(r) {} 1726 1727 /// \brief Construct an empty C-style explicit cast. 1728 explicit CStyleCastExpr(EmptyShell Shell) 1729 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1730 1731 SourceLocation getLParenLoc() const { return LPLoc; } 1732 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1733 1734 SourceLocation getRParenLoc() const { return RPLoc; } 1735 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1736 1737 virtual SourceRange getSourceRange() const { 1738 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1739 } 1740 static bool classof(const Stmt *T) { 1741 return T->getStmtClass() == CStyleCastExprClass; 1742 } 1743 static bool classof(const CStyleCastExpr *) { return true; } 1744}; 1745 1746/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1747/// 1748/// This expression node kind describes a builtin binary operation, 1749/// such as "x + y" for integer values "x" and "y". The operands will 1750/// already have been converted to appropriate types (e.g., by 1751/// performing promotions or conversions). 1752/// 1753/// In C++, where operators may be overloaded, a different kind of 1754/// expression node (CXXOperatorCallExpr) is used to express the 1755/// invocation of an overloaded operator with operator syntax. Within 1756/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1757/// used to store an expression "x + y" depends on the subexpressions 1758/// for x and y. If neither x or y is type-dependent, and the "+" 1759/// operator resolves to a built-in operation, BinaryOperator will be 1760/// used to express the computation (x and y may still be 1761/// value-dependent). If either x or y is type-dependent, or if the 1762/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1763/// be used to express the computation. 1764class BinaryOperator : public Expr { 1765public: 1766 enum Opcode { 1767 // Operators listed in order of precedence. 1768 // Note that additions to this should also update the StmtVisitor class. 1769 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1770 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1771 Add, Sub, // [C99 6.5.6] Additive operators. 1772 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1773 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1774 EQ, NE, // [C99 6.5.9] Equality operators. 1775 And, // [C99 6.5.10] Bitwise AND operator. 1776 Xor, // [C99 6.5.11] Bitwise XOR operator. 1777 Or, // [C99 6.5.12] Bitwise OR operator. 1778 LAnd, // [C99 6.5.13] Logical AND operator. 1779 LOr, // [C99 6.5.14] Logical OR operator. 1780 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1781 DivAssign, RemAssign, 1782 AddAssign, SubAssign, 1783 ShlAssign, ShrAssign, 1784 AndAssign, XorAssign, 1785 OrAssign, 1786 Comma // [C99 6.5.17] Comma operator. 1787 }; 1788private: 1789 enum { LHS, RHS, END_EXPR }; 1790 Stmt* SubExprs[END_EXPR]; 1791 Opcode Opc; 1792 SourceLocation OpLoc; 1793public: 1794 1795 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1796 SourceLocation opLoc) 1797 : Expr(BinaryOperatorClass, ResTy, 1798 lhs->isTypeDependent() || rhs->isTypeDependent(), 1799 lhs->isValueDependent() || rhs->isValueDependent()), 1800 Opc(opc), OpLoc(opLoc) { 1801 SubExprs[LHS] = lhs; 1802 SubExprs[RHS] = rhs; 1803 assert(!isCompoundAssignmentOp() && 1804 "Use ArithAssignBinaryOperator for compound assignments"); 1805 } 1806 1807 /// \brief Construct an empty binary operator. 1808 explicit BinaryOperator(EmptyShell Empty) 1809 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1810 1811 SourceLocation getOperatorLoc() const { return OpLoc; } 1812 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1813 1814 Opcode getOpcode() const { return Opc; } 1815 void setOpcode(Opcode O) { Opc = O; } 1816 1817 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1818 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1819 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1820 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1821 1822 virtual SourceRange getSourceRange() const { 1823 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1824 } 1825 1826 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1827 /// corresponds to, e.g. "<<=". 1828 static const char *getOpcodeStr(Opcode Op); 1829 1830 /// \brief Retrieve the binary opcode that corresponds to the given 1831 /// overloaded operator. 1832 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1833 1834 /// \brief Retrieve the overloaded operator kind that corresponds to 1835 /// the given binary opcode. 1836 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1837 1838 /// predicates to categorize the respective opcodes. 1839 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1840 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1841 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1842 bool isShiftOp() const { return isShiftOp(Opc); } 1843 1844 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1845 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1846 1847 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1848 bool isRelationalOp() const { return isRelationalOp(Opc); } 1849 1850 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1851 bool isEqualityOp() const { return isEqualityOp(Opc); } 1852 1853 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1854 bool isComparisonOp() const { return isComparisonOp(Opc); } 1855 1856 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1857 bool isLogicalOp() const { return isLogicalOp(Opc); } 1858 1859 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1860 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1861 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1862 1863 static bool classof(const Stmt *S) { 1864 return S->getStmtClass() == BinaryOperatorClass || 1865 S->getStmtClass() == CompoundAssignOperatorClass; 1866 } 1867 static bool classof(const BinaryOperator *) { return true; } 1868 1869 // Iterators 1870 virtual child_iterator child_begin(); 1871 virtual child_iterator child_end(); 1872 1873protected: 1874 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1875 SourceLocation oploc, bool dead) 1876 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1877 SubExprs[LHS] = lhs; 1878 SubExprs[RHS] = rhs; 1879 } 1880 1881 BinaryOperator(StmtClass SC, EmptyShell Empty) 1882 : Expr(SC, Empty), Opc(MulAssign) { } 1883}; 1884 1885/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1886/// track of the type the operation is performed in. Due to the semantics of 1887/// these operators, the operands are promoted, the aritmetic performed, an 1888/// implicit conversion back to the result type done, then the assignment takes 1889/// place. This captures the intermediate type which the computation is done 1890/// in. 1891class CompoundAssignOperator : public BinaryOperator { 1892 QualType ComputationLHSType; 1893 QualType ComputationResultType; 1894public: 1895 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1896 QualType ResType, QualType CompLHSType, 1897 QualType CompResultType, 1898 SourceLocation OpLoc) 1899 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1900 ComputationLHSType(CompLHSType), 1901 ComputationResultType(CompResultType) { 1902 assert(isCompoundAssignmentOp() && 1903 "Only should be used for compound assignments"); 1904 } 1905 1906 /// \brief Build an empty compound assignment operator expression. 1907 explicit CompoundAssignOperator(EmptyShell Empty) 1908 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1909 1910 // The two computation types are the type the LHS is converted 1911 // to for the computation and the type of the result; the two are 1912 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1913 QualType getComputationLHSType() const { return ComputationLHSType; } 1914 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1915 1916 QualType getComputationResultType() const { return ComputationResultType; } 1917 void setComputationResultType(QualType T) { ComputationResultType = T; } 1918 1919 static bool classof(const CompoundAssignOperator *) { return true; } 1920 static bool classof(const Stmt *S) { 1921 return S->getStmtClass() == CompoundAssignOperatorClass; 1922 } 1923}; 1924 1925/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1926/// GNU "missing LHS" extension is in use. 1927/// 1928class ConditionalOperator : public Expr { 1929 enum { COND, LHS, RHS, END_EXPR }; 1930 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1931 SourceLocation QuestionLoc, ColonLoc; 1932public: 1933 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1934 SourceLocation CLoc, Expr *rhs, QualType t) 1935 : Expr(ConditionalOperatorClass, t, 1936 // FIXME: the type of the conditional operator doesn't 1937 // depend on the type of the conditional, but the standard 1938 // seems to imply that it could. File a bug! 1939 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1940 (cond->isValueDependent() || 1941 (lhs && lhs->isValueDependent()) || 1942 (rhs && rhs->isValueDependent()))), 1943 QuestionLoc(QLoc), 1944 ColonLoc(CLoc) { 1945 SubExprs[COND] = cond; 1946 SubExprs[LHS] = lhs; 1947 SubExprs[RHS] = rhs; 1948 } 1949 1950 /// \brief Build an empty conditional operator. 1951 explicit ConditionalOperator(EmptyShell Empty) 1952 : Expr(ConditionalOperatorClass, Empty) { } 1953 1954 // getCond - Return the expression representing the condition for 1955 // the ?: operator. 1956 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1957 void setCond(Expr *E) { SubExprs[COND] = E; } 1958 1959 // getTrueExpr - Return the subexpression representing the value of the ?: 1960 // expression if the condition evaluates to true. In most cases this value 1961 // will be the same as getLHS() except a GCC extension allows the left 1962 // subexpression to be omitted, and instead of the condition be returned. 1963 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1964 // is only evaluated once. 1965 Expr *getTrueExpr() const { 1966 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1967 } 1968 1969 // getTrueExpr - Return the subexpression representing the value of the ?: 1970 // expression if the condition evaluates to false. This is the same as getRHS. 1971 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1972 1973 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1974 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1975 1976 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1977 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1978 1979 SourceLocation getQuestionLoc() const { return QuestionLoc; } 1980 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 1981 1982 SourceLocation getColonLoc() const { return ColonLoc; } 1983 void setColonLoc(SourceLocation L) { ColonLoc = L; } 1984 1985 virtual SourceRange getSourceRange() const { 1986 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1987 } 1988 static bool classof(const Stmt *T) { 1989 return T->getStmtClass() == ConditionalOperatorClass; 1990 } 1991 static bool classof(const ConditionalOperator *) { return true; } 1992 1993 // Iterators 1994 virtual child_iterator child_begin(); 1995 virtual child_iterator child_end(); 1996}; 1997 1998/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1999class AddrLabelExpr : public Expr { 2000 SourceLocation AmpAmpLoc, LabelLoc; 2001 LabelStmt *Label; 2002public: 2003 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2004 QualType t) 2005 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2006 2007 /// \brief Build an empty address of a label expression. 2008 explicit AddrLabelExpr(EmptyShell Empty) 2009 : Expr(AddrLabelExprClass, Empty) { } 2010 2011 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2012 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2013 SourceLocation getLabelLoc() const { return LabelLoc; } 2014 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2015 2016 virtual SourceRange getSourceRange() const { 2017 return SourceRange(AmpAmpLoc, LabelLoc); 2018 } 2019 2020 LabelStmt *getLabel() const { return Label; } 2021 void setLabel(LabelStmt *S) { Label = S; } 2022 2023 static bool classof(const Stmt *T) { 2024 return T->getStmtClass() == AddrLabelExprClass; 2025 } 2026 static bool classof(const AddrLabelExpr *) { return true; } 2027 2028 // Iterators 2029 virtual child_iterator child_begin(); 2030 virtual child_iterator child_end(); 2031}; 2032 2033/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2034/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2035/// takes the value of the last subexpression. 2036class StmtExpr : public Expr { 2037 Stmt *SubStmt; 2038 SourceLocation LParenLoc, RParenLoc; 2039public: 2040 StmtExpr(CompoundStmt *substmt, QualType T, 2041 SourceLocation lp, SourceLocation rp) : 2042 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2043 2044 /// \brief Build an empty statement expression. 2045 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2046 2047 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2048 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2049 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2050 2051 virtual SourceRange getSourceRange() const { 2052 return SourceRange(LParenLoc, RParenLoc); 2053 } 2054 2055 SourceLocation getLParenLoc() const { return LParenLoc; } 2056 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2057 SourceLocation getRParenLoc() const { return RParenLoc; } 2058 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2059 2060 static bool classof(const Stmt *T) { 2061 return T->getStmtClass() == StmtExprClass; 2062 } 2063 static bool classof(const StmtExpr *) { return true; } 2064 2065 // Iterators 2066 virtual child_iterator child_begin(); 2067 virtual child_iterator child_end(); 2068}; 2069 2070/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2071/// This AST node represents a function that returns 1 if two *types* (not 2072/// expressions) are compatible. The result of this built-in function can be 2073/// used in integer constant expressions. 2074class TypesCompatibleExpr : public Expr { 2075 QualType Type1; 2076 QualType Type2; 2077 SourceLocation BuiltinLoc, RParenLoc; 2078public: 2079 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2080 QualType t1, QualType t2, SourceLocation RP) : 2081 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 2082 BuiltinLoc(BLoc), RParenLoc(RP) {} 2083 2084 /// \brief Build an empty __builtin_type_compatible_p expression. 2085 explicit TypesCompatibleExpr(EmptyShell Empty) 2086 : Expr(TypesCompatibleExprClass, Empty) { } 2087 2088 QualType getArgType1() const { return Type1; } 2089 void setArgType1(QualType T) { Type1 = T; } 2090 QualType getArgType2() const { return Type2; } 2091 void setArgType2(QualType T) { Type2 = T; } 2092 2093 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2094 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2095 2096 SourceLocation getRParenLoc() const { return RParenLoc; } 2097 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2098 2099 virtual SourceRange getSourceRange() const { 2100 return SourceRange(BuiltinLoc, RParenLoc); 2101 } 2102 static bool classof(const Stmt *T) { 2103 return T->getStmtClass() == TypesCompatibleExprClass; 2104 } 2105 static bool classof(const TypesCompatibleExpr *) { return true; } 2106 2107 // Iterators 2108 virtual child_iterator child_begin(); 2109 virtual child_iterator child_end(); 2110}; 2111 2112/// ShuffleVectorExpr - clang-specific builtin-in function 2113/// __builtin_shufflevector. 2114/// This AST node represents a operator that does a constant 2115/// shuffle, similar to LLVM's shufflevector instruction. It takes 2116/// two vectors and a variable number of constant indices, 2117/// and returns the appropriately shuffled vector. 2118class ShuffleVectorExpr : public Expr { 2119 SourceLocation BuiltinLoc, RParenLoc; 2120 2121 // SubExprs - the list of values passed to the __builtin_shufflevector 2122 // function. The first two are vectors, and the rest are constant 2123 // indices. The number of values in this list is always 2124 // 2+the number of indices in the vector type. 2125 Stmt **SubExprs; 2126 unsigned NumExprs; 2127 2128protected: 2129 virtual void DoDestroy(ASTContext &C); 2130 2131public: 2132 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2133 QualType Type, SourceLocation BLoc, 2134 SourceLocation RP) : 2135 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 2136 RParenLoc(RP), NumExprs(nexpr) { 2137 2138 SubExprs = new (C) Stmt*[nexpr]; 2139 for (unsigned i = 0; i < nexpr; i++) 2140 SubExprs[i] = args[i]; 2141 } 2142 2143 /// \brief Build an empty vector-shuffle expression. 2144 explicit ShuffleVectorExpr(EmptyShell Empty) 2145 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2146 2147 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2148 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2149 2150 SourceLocation getRParenLoc() const { return RParenLoc; } 2151 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2152 2153 virtual SourceRange getSourceRange() const { 2154 return SourceRange(BuiltinLoc, RParenLoc); 2155 } 2156 static bool classof(const Stmt *T) { 2157 return T->getStmtClass() == ShuffleVectorExprClass; 2158 } 2159 static bool classof(const ShuffleVectorExpr *) { return true; } 2160 2161 ~ShuffleVectorExpr() {} 2162 2163 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2164 /// constant expression, the actual arguments passed in, and the function 2165 /// pointers. 2166 unsigned getNumSubExprs() const { return NumExprs; } 2167 2168 /// getExpr - Return the Expr at the specified index. 2169 Expr *getExpr(unsigned Index) { 2170 assert((Index < NumExprs) && "Arg access out of range!"); 2171 return cast<Expr>(SubExprs[Index]); 2172 } 2173 const Expr *getExpr(unsigned Index) const { 2174 assert((Index < NumExprs) && "Arg access out of range!"); 2175 return cast<Expr>(SubExprs[Index]); 2176 } 2177 2178 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2179 2180 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2181 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2182 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2183 } 2184 2185 // Iterators 2186 virtual child_iterator child_begin(); 2187 virtual child_iterator child_end(); 2188}; 2189 2190/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2191/// This AST node is similar to the conditional operator (?:) in C, with 2192/// the following exceptions: 2193/// - the test expression must be a integer constant expression. 2194/// - the expression returned acts like the chosen subexpression in every 2195/// visible way: the type is the same as that of the chosen subexpression, 2196/// and all predicates (whether it's an l-value, whether it's an integer 2197/// constant expression, etc.) return the same result as for the chosen 2198/// sub-expression. 2199class ChooseExpr : public Expr { 2200 enum { COND, LHS, RHS, END_EXPR }; 2201 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2202 SourceLocation BuiltinLoc, RParenLoc; 2203public: 2204 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2205 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2206 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2207 BuiltinLoc(BLoc), RParenLoc(RP) { 2208 SubExprs[COND] = cond; 2209 SubExprs[LHS] = lhs; 2210 SubExprs[RHS] = rhs; 2211 } 2212 2213 /// \brief Build an empty __builtin_choose_expr. 2214 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2215 2216 /// isConditionTrue - Return whether the condition is true (i.e. not 2217 /// equal to zero). 2218 bool isConditionTrue(ASTContext &C) const; 2219 2220 /// getChosenSubExpr - Return the subexpression chosen according to the 2221 /// condition. 2222 Expr *getChosenSubExpr(ASTContext &C) const { 2223 return isConditionTrue(C) ? getLHS() : getRHS(); 2224 } 2225 2226 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2227 void setCond(Expr *E) { SubExprs[COND] = E; } 2228 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2229 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2230 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2231 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2232 2233 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2234 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2235 2236 SourceLocation getRParenLoc() const { return RParenLoc; } 2237 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2238 2239 virtual SourceRange getSourceRange() const { 2240 return SourceRange(BuiltinLoc, RParenLoc); 2241 } 2242 static bool classof(const Stmt *T) { 2243 return T->getStmtClass() == ChooseExprClass; 2244 } 2245 static bool classof(const ChooseExpr *) { return true; } 2246 2247 // Iterators 2248 virtual child_iterator child_begin(); 2249 virtual child_iterator child_end(); 2250}; 2251 2252/// GNUNullExpr - Implements the GNU __null extension, which is a name 2253/// for a null pointer constant that has integral type (e.g., int or 2254/// long) and is the same size and alignment as a pointer. The __null 2255/// extension is typically only used by system headers, which define 2256/// NULL as __null in C++ rather than using 0 (which is an integer 2257/// that may not match the size of a pointer). 2258class GNUNullExpr : public Expr { 2259 /// TokenLoc - The location of the __null keyword. 2260 SourceLocation TokenLoc; 2261 2262public: 2263 GNUNullExpr(QualType Ty, SourceLocation Loc) 2264 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 2265 2266 /// \brief Build an empty GNU __null expression. 2267 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2268 2269 /// getTokenLocation - The location of the __null token. 2270 SourceLocation getTokenLocation() const { return TokenLoc; } 2271 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2272 2273 virtual SourceRange getSourceRange() const { 2274 return SourceRange(TokenLoc); 2275 } 2276 static bool classof(const Stmt *T) { 2277 return T->getStmtClass() == GNUNullExprClass; 2278 } 2279 static bool classof(const GNUNullExpr *) { return true; } 2280 2281 // Iterators 2282 virtual child_iterator child_begin(); 2283 virtual child_iterator child_end(); 2284}; 2285 2286/// VAArgExpr, used for the builtin function __builtin_va_start. 2287class VAArgExpr : public Expr { 2288 Stmt *Val; 2289 SourceLocation BuiltinLoc, RParenLoc; 2290public: 2291 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2292 : Expr(VAArgExprClass, t), 2293 Val(e), 2294 BuiltinLoc(BLoc), 2295 RParenLoc(RPLoc) { } 2296 2297 /// \brief Create an empty __builtin_va_start expression. 2298 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2299 2300 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2301 Expr *getSubExpr() { return cast<Expr>(Val); } 2302 void setSubExpr(Expr *E) { Val = E; } 2303 2304 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2305 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2306 2307 SourceLocation getRParenLoc() const { return RParenLoc; } 2308 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2309 2310 virtual SourceRange getSourceRange() const { 2311 return SourceRange(BuiltinLoc, RParenLoc); 2312 } 2313 static bool classof(const Stmt *T) { 2314 return T->getStmtClass() == VAArgExprClass; 2315 } 2316 static bool classof(const VAArgExpr *) { return true; } 2317 2318 // Iterators 2319 virtual child_iterator child_begin(); 2320 virtual child_iterator child_end(); 2321}; 2322 2323/// @brief Describes an C or C++ initializer list. 2324/// 2325/// InitListExpr describes an initializer list, which can be used to 2326/// initialize objects of different types, including 2327/// struct/class/union types, arrays, and vectors. For example: 2328/// 2329/// @code 2330/// struct foo x = { 1, { 2, 3 } }; 2331/// @endcode 2332/// 2333/// Prior to semantic analysis, an initializer list will represent the 2334/// initializer list as written by the user, but will have the 2335/// placeholder type "void". This initializer list is called the 2336/// syntactic form of the initializer, and may contain C99 designated 2337/// initializers (represented as DesignatedInitExprs), initializations 2338/// of subobject members without explicit braces, and so on. Clients 2339/// interested in the original syntax of the initializer list should 2340/// use the syntactic form of the initializer list. 2341/// 2342/// After semantic analysis, the initializer list will represent the 2343/// semantic form of the initializer, where the initializations of all 2344/// subobjects are made explicit with nested InitListExpr nodes and 2345/// C99 designators have been eliminated by placing the designated 2346/// initializations into the subobject they initialize. Additionally, 2347/// any "holes" in the initialization, where no initializer has been 2348/// specified for a particular subobject, will be replaced with 2349/// implicitly-generated ImplicitValueInitExpr expressions that 2350/// value-initialize the subobjects. Note, however, that the 2351/// initializer lists may still have fewer initializers than there are 2352/// elements to initialize within the object. 2353/// 2354/// Given the semantic form of the initializer list, one can retrieve 2355/// the original syntactic form of that initializer list (if it 2356/// exists) using getSyntacticForm(). Since many initializer lists 2357/// have the same syntactic and semantic forms, getSyntacticForm() may 2358/// return NULL, indicating that the current initializer list also 2359/// serves as its syntactic form. 2360class InitListExpr : public Expr { 2361 // FIXME: Eliminate this vector in favor of ASTContext allocation 2362 std::vector<Stmt *> InitExprs; 2363 SourceLocation LBraceLoc, RBraceLoc; 2364 2365 /// Contains the initializer list that describes the syntactic form 2366 /// written in the source code. 2367 InitListExpr *SyntacticForm; 2368 2369 /// If this initializer list initializes a union, specifies which 2370 /// field within the union will be initialized. 2371 FieldDecl *UnionFieldInit; 2372 2373 /// Whether this initializer list originally had a GNU array-range 2374 /// designator in it. This is a temporary marker used by CodeGen. 2375 bool HadArrayRangeDesignator; 2376 2377public: 2378 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2379 SourceLocation rbraceloc); 2380 2381 /// \brief Build an empty initializer list. 2382 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2383 2384 unsigned getNumInits() const { return InitExprs.size(); } 2385 2386 const Expr* getInit(unsigned Init) const { 2387 assert(Init < getNumInits() && "Initializer access out of range!"); 2388 return cast_or_null<Expr>(InitExprs[Init]); 2389 } 2390 2391 Expr* getInit(unsigned Init) { 2392 assert(Init < getNumInits() && "Initializer access out of range!"); 2393 return cast_or_null<Expr>(InitExprs[Init]); 2394 } 2395 2396 void setInit(unsigned Init, Expr *expr) { 2397 assert(Init < getNumInits() && "Initializer access out of range!"); 2398 InitExprs[Init] = expr; 2399 } 2400 2401 /// \brief Reserve space for some number of initializers. 2402 void reserveInits(unsigned NumInits); 2403 2404 /// @brief Specify the number of initializers 2405 /// 2406 /// If there are more than @p NumInits initializers, the remaining 2407 /// initializers will be destroyed. If there are fewer than @p 2408 /// NumInits initializers, NULL expressions will be added for the 2409 /// unknown initializers. 2410 void resizeInits(ASTContext &Context, unsigned NumInits); 2411 2412 /// @brief Updates the initializer at index @p Init with the new 2413 /// expression @p expr, and returns the old expression at that 2414 /// location. 2415 /// 2416 /// When @p Init is out of range for this initializer list, the 2417 /// initializer list will be extended with NULL expressions to 2418 /// accomodate the new entry. 2419 Expr *updateInit(unsigned Init, Expr *expr); 2420 2421 /// \brief If this initializes a union, specifies which field in the 2422 /// union to initialize. 2423 /// 2424 /// Typically, this field is the first named field within the 2425 /// union. However, a designated initializer can specify the 2426 /// initialization of a different field within the union. 2427 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2428 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2429 2430 // Explicit InitListExpr's originate from source code (and have valid source 2431 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2432 bool isExplicit() { 2433 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2434 } 2435 2436 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2437 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2438 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2439 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2440 2441 /// @brief Retrieve the initializer list that describes the 2442 /// syntactic form of the initializer. 2443 /// 2444 /// 2445 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2446 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2447 2448 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2449 void sawArrayRangeDesignator(bool ARD = true) { 2450 HadArrayRangeDesignator = ARD; 2451 } 2452 2453 virtual SourceRange getSourceRange() const { 2454 return SourceRange(LBraceLoc, RBraceLoc); 2455 } 2456 static bool classof(const Stmt *T) { 2457 return T->getStmtClass() == InitListExprClass; 2458 } 2459 static bool classof(const InitListExpr *) { return true; } 2460 2461 // Iterators 2462 virtual child_iterator child_begin(); 2463 virtual child_iterator child_end(); 2464 2465 typedef std::vector<Stmt *>::iterator iterator; 2466 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2467 2468 iterator begin() { return InitExprs.begin(); } 2469 iterator end() { return InitExprs.end(); } 2470 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2471 reverse_iterator rend() { return InitExprs.rend(); } 2472}; 2473 2474/// @brief Represents a C99 designated initializer expression. 2475/// 2476/// A designated initializer expression (C99 6.7.8) contains one or 2477/// more designators (which can be field designators, array 2478/// designators, or GNU array-range designators) followed by an 2479/// expression that initializes the field or element(s) that the 2480/// designators refer to. For example, given: 2481/// 2482/// @code 2483/// struct point { 2484/// double x; 2485/// double y; 2486/// }; 2487/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2488/// @endcode 2489/// 2490/// The InitListExpr contains three DesignatedInitExprs, the first of 2491/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2492/// designators, one array designator for @c [2] followed by one field 2493/// designator for @c .y. The initalization expression will be 1.0. 2494class DesignatedInitExpr : public Expr { 2495public: 2496 /// \brief Forward declaration of the Designator class. 2497 class Designator; 2498 2499private: 2500 /// The location of the '=' or ':' prior to the actual initializer 2501 /// expression. 2502 SourceLocation EqualOrColonLoc; 2503 2504 /// Whether this designated initializer used the GNU deprecated 2505 /// syntax rather than the C99 '=' syntax. 2506 bool GNUSyntax : 1; 2507 2508 /// The number of designators in this initializer expression. 2509 unsigned NumDesignators : 15; 2510 2511 /// \brief The designators in this designated initialization 2512 /// expression. 2513 Designator *Designators; 2514 2515 /// The number of subexpressions of this initializer expression, 2516 /// which contains both the initializer and any additional 2517 /// expressions used by array and array-range designators. 2518 unsigned NumSubExprs : 16; 2519 2520 2521 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2522 const Designator *Designators, 2523 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2524 Expr **IndexExprs, unsigned NumIndexExprs, 2525 Expr *Init); 2526 2527 explicit DesignatedInitExpr(unsigned NumSubExprs) 2528 : Expr(DesignatedInitExprClass, EmptyShell()), 2529 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2530 2531protected: 2532 virtual void DoDestroy(ASTContext &C); 2533 2534public: 2535 /// A field designator, e.g., ".x". 2536 struct FieldDesignator { 2537 /// Refers to the field that is being initialized. The low bit 2538 /// of this field determines whether this is actually a pointer 2539 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2540 /// initially constructed, a field designator will store an 2541 /// IdentifierInfo*. After semantic analysis has resolved that 2542 /// name, the field designator will instead store a FieldDecl*. 2543 uintptr_t NameOrField; 2544 2545 /// The location of the '.' in the designated initializer. 2546 unsigned DotLoc; 2547 2548 /// The location of the field name in the designated initializer. 2549 unsigned FieldLoc; 2550 }; 2551 2552 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2553 struct ArrayOrRangeDesignator { 2554 /// Location of the first index expression within the designated 2555 /// initializer expression's list of subexpressions. 2556 unsigned Index; 2557 /// The location of the '[' starting the array range designator. 2558 unsigned LBracketLoc; 2559 /// The location of the ellipsis separating the start and end 2560 /// indices. Only valid for GNU array-range designators. 2561 unsigned EllipsisLoc; 2562 /// The location of the ']' terminating the array range designator. 2563 unsigned RBracketLoc; 2564 }; 2565 2566 /// @brief Represents a single C99 designator. 2567 /// 2568 /// @todo This class is infuriatingly similar to clang::Designator, 2569 /// but minor differences (storing indices vs. storing pointers) 2570 /// keep us from reusing it. Try harder, later, to rectify these 2571 /// differences. 2572 class Designator { 2573 /// @brief The kind of designator this describes. 2574 enum { 2575 FieldDesignator, 2576 ArrayDesignator, 2577 ArrayRangeDesignator 2578 } Kind; 2579 2580 union { 2581 /// A field designator, e.g., ".x". 2582 struct FieldDesignator Field; 2583 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2584 struct ArrayOrRangeDesignator ArrayOrRange; 2585 }; 2586 friend class DesignatedInitExpr; 2587 2588 public: 2589 Designator() {} 2590 2591 /// @brief Initializes a field designator. 2592 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2593 SourceLocation FieldLoc) 2594 : Kind(FieldDesignator) { 2595 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2596 Field.DotLoc = DotLoc.getRawEncoding(); 2597 Field.FieldLoc = FieldLoc.getRawEncoding(); 2598 } 2599 2600 /// @brief Initializes an array designator. 2601 Designator(unsigned Index, SourceLocation LBracketLoc, 2602 SourceLocation RBracketLoc) 2603 : Kind(ArrayDesignator) { 2604 ArrayOrRange.Index = Index; 2605 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2606 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2607 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2608 } 2609 2610 /// @brief Initializes a GNU array-range designator. 2611 Designator(unsigned Index, SourceLocation LBracketLoc, 2612 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2613 : Kind(ArrayRangeDesignator) { 2614 ArrayOrRange.Index = Index; 2615 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2616 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2617 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2618 } 2619 2620 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2621 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2622 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2623 2624 IdentifierInfo * getFieldName(); 2625 2626 FieldDecl *getField() { 2627 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2628 if (Field.NameOrField & 0x01) 2629 return 0; 2630 else 2631 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2632 } 2633 2634 void setField(FieldDecl *FD) { 2635 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2636 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2637 } 2638 2639 SourceLocation getDotLoc() const { 2640 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2641 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2642 } 2643 2644 SourceLocation getFieldLoc() const { 2645 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2646 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2647 } 2648 2649 SourceLocation getLBracketLoc() const { 2650 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2651 "Only valid on an array or array-range designator"); 2652 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2653 } 2654 2655 SourceLocation getRBracketLoc() const { 2656 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2657 "Only valid on an array or array-range designator"); 2658 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2659 } 2660 2661 SourceLocation getEllipsisLoc() const { 2662 assert(Kind == ArrayRangeDesignator && 2663 "Only valid on an array-range designator"); 2664 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2665 } 2666 2667 unsigned getFirstExprIndex() const { 2668 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2669 "Only valid on an array or array-range designator"); 2670 return ArrayOrRange.Index; 2671 } 2672 2673 SourceLocation getStartLocation() const { 2674 if (Kind == FieldDesignator) 2675 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2676 else 2677 return getLBracketLoc(); 2678 } 2679 }; 2680 2681 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2682 unsigned NumDesignators, 2683 Expr **IndexExprs, unsigned NumIndexExprs, 2684 SourceLocation EqualOrColonLoc, 2685 bool GNUSyntax, Expr *Init); 2686 2687 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2688 2689 /// @brief Returns the number of designators in this initializer. 2690 unsigned size() const { return NumDesignators; } 2691 2692 // Iterator access to the designators. 2693 typedef Designator* designators_iterator; 2694 designators_iterator designators_begin() { return Designators; } 2695 designators_iterator designators_end() { 2696 return Designators + NumDesignators; 2697 } 2698 2699 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2700 2701 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2702 2703 Expr *getArrayIndex(const Designator& D); 2704 Expr *getArrayRangeStart(const Designator& D); 2705 Expr *getArrayRangeEnd(const Designator& D); 2706 2707 /// @brief Retrieve the location of the '=' that precedes the 2708 /// initializer value itself, if present. 2709 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2710 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2711 2712 /// @brief Determines whether this designated initializer used the 2713 /// deprecated GNU syntax for designated initializers. 2714 bool usesGNUSyntax() const { return GNUSyntax; } 2715 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2716 2717 /// @brief Retrieve the initializer value. 2718 Expr *getInit() const { 2719 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2720 } 2721 2722 void setInit(Expr *init) { 2723 *child_begin() = init; 2724 } 2725 2726 /// \brief Retrieve the total number of subexpressions in this 2727 /// designated initializer expression, including the actual 2728 /// initialized value and any expressions that occur within array 2729 /// and array-range designators. 2730 unsigned getNumSubExprs() const { return NumSubExprs; } 2731 2732 Expr *getSubExpr(unsigned Idx) { 2733 assert(Idx < NumSubExprs && "Subscript out of range"); 2734 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2735 Ptr += sizeof(DesignatedInitExpr); 2736 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2737 } 2738 2739 void setSubExpr(unsigned Idx, Expr *E) { 2740 assert(Idx < NumSubExprs && "Subscript out of range"); 2741 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2742 Ptr += sizeof(DesignatedInitExpr); 2743 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2744 } 2745 2746 /// \brief Replaces the designator at index @p Idx with the series 2747 /// of designators in [First, Last). 2748 void ExpandDesignator(unsigned Idx, const Designator *First, 2749 const Designator *Last); 2750 2751 virtual SourceRange getSourceRange() const; 2752 2753 static bool classof(const Stmt *T) { 2754 return T->getStmtClass() == DesignatedInitExprClass; 2755 } 2756 static bool classof(const DesignatedInitExpr *) { return true; } 2757 2758 // Iterators 2759 virtual child_iterator child_begin(); 2760 virtual child_iterator child_end(); 2761}; 2762 2763/// \brief Represents an implicitly-generated value initialization of 2764/// an object of a given type. 2765/// 2766/// Implicit value initializations occur within semantic initializer 2767/// list expressions (InitListExpr) as placeholders for subobject 2768/// initializations not explicitly specified by the user. 2769/// 2770/// \see InitListExpr 2771class ImplicitValueInitExpr : public Expr { 2772public: 2773 explicit ImplicitValueInitExpr(QualType ty) 2774 : Expr(ImplicitValueInitExprClass, ty) { } 2775 2776 /// \brief Construct an empty implicit value initialization. 2777 explicit ImplicitValueInitExpr(EmptyShell Empty) 2778 : Expr(ImplicitValueInitExprClass, Empty) { } 2779 2780 static bool classof(const Stmt *T) { 2781 return T->getStmtClass() == ImplicitValueInitExprClass; 2782 } 2783 static bool classof(const ImplicitValueInitExpr *) { return true; } 2784 2785 virtual SourceRange getSourceRange() const { 2786 return SourceRange(); 2787 } 2788 2789 // Iterators 2790 virtual child_iterator child_begin(); 2791 virtual child_iterator child_end(); 2792}; 2793 2794 2795class ParenListExpr : public Expr { 2796 Stmt **Exprs; 2797 unsigned NumExprs; 2798 SourceLocation LParenLoc, RParenLoc; 2799 2800protected: 2801 virtual void DoDestroy(ASTContext& C); 2802 2803public: 2804 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2805 unsigned numexprs, SourceLocation rparenloc); 2806 2807 ~ParenListExpr() {} 2808 2809 /// \brief Build an empty paren list. 2810 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2811 2812 unsigned getNumExprs() const { return NumExprs; } 2813 2814 const Expr* getExpr(unsigned Init) const { 2815 assert(Init < getNumExprs() && "Initializer access out of range!"); 2816 return cast_or_null<Expr>(Exprs[Init]); 2817 } 2818 2819 Expr* getExpr(unsigned Init) { 2820 assert(Init < getNumExprs() && "Initializer access out of range!"); 2821 return cast_or_null<Expr>(Exprs[Init]); 2822 } 2823 2824 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2825 2826 SourceLocation getLParenLoc() const { return LParenLoc; } 2827 SourceLocation getRParenLoc() const { return RParenLoc; } 2828 2829 virtual SourceRange getSourceRange() const { 2830 return SourceRange(LParenLoc, RParenLoc); 2831 } 2832 static bool classof(const Stmt *T) { 2833 return T->getStmtClass() == ParenListExprClass; 2834 } 2835 static bool classof(const ParenListExpr *) { return true; } 2836 2837 // Iterators 2838 virtual child_iterator child_begin(); 2839 virtual child_iterator child_end(); 2840}; 2841 2842 2843//===----------------------------------------------------------------------===// 2844// Clang Extensions 2845//===----------------------------------------------------------------------===// 2846 2847 2848/// ExtVectorElementExpr - This represents access to specific elements of a 2849/// vector, and may occur on the left hand side or right hand side. For example 2850/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2851/// 2852/// Note that the base may have either vector or pointer to vector type, just 2853/// like a struct field reference. 2854/// 2855class ExtVectorElementExpr : public Expr { 2856 Stmt *Base; 2857 IdentifierInfo *Accessor; 2858 SourceLocation AccessorLoc; 2859public: 2860 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2861 SourceLocation loc) 2862 : Expr(ExtVectorElementExprClass, ty), 2863 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2864 2865 /// \brief Build an empty vector element expression. 2866 explicit ExtVectorElementExpr(EmptyShell Empty) 2867 : Expr(ExtVectorElementExprClass, Empty) { } 2868 2869 const Expr *getBase() const { return cast<Expr>(Base); } 2870 Expr *getBase() { return cast<Expr>(Base); } 2871 void setBase(Expr *E) { Base = E; } 2872 2873 IdentifierInfo &getAccessor() const { return *Accessor; } 2874 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2875 2876 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2877 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2878 2879 /// getNumElements - Get the number of components being selected. 2880 unsigned getNumElements() const; 2881 2882 /// containsDuplicateElements - Return true if any element access is 2883 /// repeated. 2884 bool containsDuplicateElements() const; 2885 2886 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2887 /// aggregate Constant of ConstantInt(s). 2888 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2889 2890 virtual SourceRange getSourceRange() const { 2891 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2892 } 2893 2894 /// isArrow - Return true if the base expression is a pointer to vector, 2895 /// return false if the base expression is a vector. 2896 bool isArrow() const; 2897 2898 static bool classof(const Stmt *T) { 2899 return T->getStmtClass() == ExtVectorElementExprClass; 2900 } 2901 static bool classof(const ExtVectorElementExpr *) { return true; } 2902 2903 // Iterators 2904 virtual child_iterator child_begin(); 2905 virtual child_iterator child_end(); 2906}; 2907 2908 2909/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2910/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2911class BlockExpr : public Expr { 2912protected: 2913 BlockDecl *TheBlock; 2914 bool HasBlockDeclRefExprs; 2915public: 2916 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2917 : Expr(BlockExprClass, ty), 2918 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2919 2920 /// \brief Build an empty block expression. 2921 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2922 2923 const BlockDecl *getBlockDecl() const { return TheBlock; } 2924 BlockDecl *getBlockDecl() { return TheBlock; } 2925 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2926 2927 // Convenience functions for probing the underlying BlockDecl. 2928 SourceLocation getCaretLocation() const; 2929 const Stmt *getBody() const; 2930 Stmt *getBody(); 2931 2932 virtual SourceRange getSourceRange() const { 2933 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2934 } 2935 2936 /// getFunctionType - Return the underlying function type for this block. 2937 const FunctionType *getFunctionType() const; 2938 2939 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2940 /// inside of the block that reference values outside the block. 2941 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2942 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2943 2944 static bool classof(const Stmt *T) { 2945 return T->getStmtClass() == BlockExprClass; 2946 } 2947 static bool classof(const BlockExpr *) { return true; } 2948 2949 // Iterators 2950 virtual child_iterator child_begin(); 2951 virtual child_iterator child_end(); 2952}; 2953 2954/// BlockDeclRefExpr - A reference to a declared variable, function, 2955/// enum, etc. 2956class BlockDeclRefExpr : public Expr { 2957 ValueDecl *D; 2958 SourceLocation Loc; 2959 bool IsByRef : 1; 2960 bool ConstQualAdded : 1; 2961public: 2962 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2963 bool constAdded = false) : 2964 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2965 ConstQualAdded(constAdded) {} 2966 2967 // \brief Build an empty reference to a declared variable in a 2968 // block. 2969 explicit BlockDeclRefExpr(EmptyShell Empty) 2970 : Expr(BlockDeclRefExprClass, Empty) { } 2971 2972 ValueDecl *getDecl() { return D; } 2973 const ValueDecl *getDecl() const { return D; } 2974 void setDecl(ValueDecl *VD) { D = VD; } 2975 2976 SourceLocation getLocation() const { return Loc; } 2977 void setLocation(SourceLocation L) { Loc = L; } 2978 2979 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2980 2981 bool isByRef() const { return IsByRef; } 2982 void setByRef(bool BR) { IsByRef = BR; } 2983 2984 bool isConstQualAdded() const { return ConstQualAdded; } 2985 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2986 2987 static bool classof(const Stmt *T) { 2988 return T->getStmtClass() == BlockDeclRefExprClass; 2989 } 2990 static bool classof(const BlockDeclRefExpr *) { return true; } 2991 2992 // Iterators 2993 virtual child_iterator child_begin(); 2994 virtual child_iterator child_end(); 2995}; 2996 2997} // end namespace clang 2998 2999#endif 3000