Expr.h revision a2813cec2605ce7878d1b13471d685f689b251af
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 38/// Expr - This represents one expression. Note that Expr's are subclasses of 39/// Stmt. This allows an expression to be transparently used any place a Stmt 40/// is required. 41/// 42class Expr : public Stmt { 43 QualType TR; 44 45protected: 46 /// TypeDependent - Whether this expression is type-dependent 47 /// (C++ [temp.dep.expr]). 48 bool TypeDependent : 1; 49 50 /// ValueDependent - Whether this expression is value-dependent 51 /// (C++ [temp.dep.constexpr]). 52 bool ValueDependent : 1; 53 54 // FIXME: Eventually, this constructor should go away and we should 55 // require every subclass to provide type/value-dependence 56 // information. 57 Expr(StmtClass SC, QualType T) 58 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 59 setType(T); 60 } 61 62 Expr(StmtClass SC, QualType T, bool TD, bool VD) 63 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 64 setType(T); 65 } 66 67 /// \brief Construct an empty expression. 68 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 69 70public: 71 /// \brief Increases the reference count for this expression. 72 /// 73 /// Invoke the Retain() operation when this expression 74 /// is being shared by another owner. 75 Expr *Retain() { 76 Stmt::Retain(); 77 return this; 78 } 79 80 QualType getType() const { return TR; } 81 void setType(QualType t) { 82 // In C++, the type of an expression is always adjusted so that it 83 // will not have reference type an expression will never have 84 // reference type (C++ [expr]p6). Use 85 // QualType::getNonReferenceType() to retrieve the non-reference 86 // type. Additionally, inspect Expr::isLvalue to determine whether 87 // an expression that is adjusted in this manner should be 88 // considered an lvalue. 89 assert((TR.isNull() || !TR->isReferenceType()) && 90 "Expressions can't have reference type"); 91 92 TR = t; 93 } 94 95 /// isValueDependent - Determines whether this expression is 96 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 97 /// array bound of "Chars" in the following example is 98 /// value-dependent. 99 /// @code 100 /// template<int Size, char (&Chars)[Size]> struct meta_string; 101 /// @endcode 102 bool isValueDependent() const { return ValueDependent; } 103 104 /// \brief Set whether this expression is value-dependent or not. 105 void setValueDependent(bool VD) { ValueDependent = VD; } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { TypeDependent = TD; } 122 123 /// SourceLocation tokens are not useful in isolation - they are low level 124 /// value objects created/interpreted by SourceManager. We assume AST 125 /// clients will have a pointer to the respective SourceManager. 126 virtual SourceRange getSourceRange() const = 0; 127 128 /// getExprLoc - Return the preferred location for the arrow when diagnosing 129 /// a problem with a generic expression. 130 virtual SourceLocation getExprLoc() const { return getLocStart(); } 131 132 /// isUnusedResultAWarning - Return true if this immediate expression should 133 /// be warned about if the result is unused. If so, fill in Loc and Ranges 134 /// with location to warn on and the source range[s] to report with the 135 /// warning. 136 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 137 SourceRange &R2) const; 138 139 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 140 /// incomplete type other than void. Nonarray expressions that can be lvalues: 141 /// - name, where name must be a variable 142 /// - e[i] 143 /// - (e), where e must be an lvalue 144 /// - e.name, where e must be an lvalue 145 /// - e->name 146 /// - *e, the type of e cannot be a function type 147 /// - string-constant 148 /// - reference type [C++ [expr]] 149 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 150 /// 151 enum isLvalueResult { 152 LV_Valid, 153 LV_NotObjectType, 154 LV_IncompleteVoidType, 155 LV_DuplicateVectorComponents, 156 LV_InvalidExpression, 157 LV_MemberFunction 158 }; 159 isLvalueResult isLvalue(ASTContext &Ctx) const; 160 161 // Same as above, but excluding checks for non-object and void types in C 162 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 163 164 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 165 /// does not have an incomplete type, does not have a const-qualified type, 166 /// and if it is a structure or union, does not have any member (including, 167 /// recursively, any member or element of all contained aggregates or unions) 168 /// with a const-qualified type. 169 /// 170 /// \param Loc [in] [out] - A source location which *may* be filled 171 /// in with the location of the expression making this a 172 /// non-modifiable lvalue, if specified. 173 enum isModifiableLvalueResult { 174 MLV_Valid, 175 MLV_NotObjectType, 176 MLV_IncompleteVoidType, 177 MLV_DuplicateVectorComponents, 178 MLV_InvalidExpression, 179 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 180 MLV_IncompleteType, 181 MLV_ConstQualified, 182 MLV_ArrayType, 183 MLV_NotBlockQualified, 184 MLV_ReadonlyProperty, 185 MLV_NoSetterProperty, 186 MLV_MemberFunction 187 }; 188 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 189 SourceLocation *Loc = 0) const; 190 191 /// \brief If this expression refers to a bit-field, retrieve the 192 /// declaration of that bit-field. 193 FieldDecl *getBitField(); 194 195 const FieldDecl *getBitField() const { 196 return const_cast<Expr*>(this)->getBitField(); 197 } 198 199 /// isIntegerConstantExpr - Return true if this expression is a valid integer 200 /// constant expression, and, if so, return its value in Result. If not a 201 /// valid i-c-e, return false and fill in Loc (if specified) with the location 202 /// of the invalid expression. 203 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 204 SourceLocation *Loc = 0, 205 bool isEvaluated = true) const; 206 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 207 llvm::APSInt X; 208 return isIntegerConstantExpr(X, Ctx, Loc); 209 } 210 /// isConstantInitializer - Returns true if this expression is a constant 211 /// initializer, which can be emitted at compile-time. 212 bool isConstantInitializer(ASTContext &Ctx) const; 213 214 /// EvalResult is a struct with detailed info about an evaluated expression. 215 struct EvalResult { 216 /// Val - This is the value the expression can be folded to. 217 APValue Val; 218 219 /// HasSideEffects - Whether the evaluated expression has side effects. 220 /// For example, (f() && 0) can be folded, but it still has side effects. 221 bool HasSideEffects; 222 223 /// Diag - If the expression is unfoldable, then Diag contains a note 224 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 225 /// position for the error, and DiagExpr is the expression that caused 226 /// the error. 227 /// If the expression is foldable, but not an integer constant expression, 228 /// Diag contains a note diagnostic that describes why it isn't an integer 229 /// constant expression. If the expression *is* an integer constant 230 /// expression, then Diag will be zero. 231 unsigned Diag; 232 const Expr *DiagExpr; 233 SourceLocation DiagLoc; 234 235 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 236 }; 237 238 /// Evaluate - Return true if this is a constant which we can fold using 239 /// any crazy technique (that has nothing to do with language standards) that 240 /// we want to. If this function returns true, it returns the folded constant 241 /// in Result. 242 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 243 244 /// isEvaluatable - Call Evaluate to see if this expression can be constant 245 /// folded, but discard the result. 246 bool isEvaluatable(ASTContext &Ctx) const; 247 248 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 249 /// must be called on an expression that constant folds to an integer. 250 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 251 252 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 253 /// with link time known address. 254 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 255 256 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 257 /// also succeeds on stack based, immutable address lvalues. 258 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 259 260 /// \brief Enumeration used to describe how \c isNullPointerConstant() 261 /// should cope with value-dependent expressions. 262 enum NullPointerConstantValueDependence { 263 /// \brief Specifies that the expression should never be value-dependent. 264 NPC_NeverValueDependent = 0, 265 266 /// \brief Specifies that a value-dependent expression of integral or 267 /// dependent type should be considered a null pointer constant. 268 NPC_ValueDependentIsNull, 269 270 /// \brief Specifies that a value-dependent expression should be considered 271 /// to never be a null pointer constant. 272 NPC_ValueDependentIsNotNull 273 }; 274 275 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 276 /// integer constant expression with the value zero, or if this is one that is 277 /// cast to void*. 278 bool isNullPointerConstant(ASTContext &Ctx, 279 NullPointerConstantValueDependence NPC) const; 280 281 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 282 /// write barrier. 283 bool isOBJCGCCandidate(ASTContext &Ctx) const; 284 285 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 286 /// its subexpression. If that subexpression is also a ParenExpr, 287 /// then this method recursively returns its subexpression, and so forth. 288 /// Otherwise, the method returns the current Expr. 289 Expr* IgnoreParens(); 290 291 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 292 /// or CastExprs, returning their operand. 293 Expr *IgnoreParenCasts(); 294 295 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 296 /// value (including ptr->int casts of the same size). Strip off any 297 /// ParenExpr or CastExprs, returning their operand. 298 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 299 300 const Expr* IgnoreParens() const { 301 return const_cast<Expr*>(this)->IgnoreParens(); 302 } 303 const Expr *IgnoreParenCasts() const { 304 return const_cast<Expr*>(this)->IgnoreParenCasts(); 305 } 306 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 307 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 308 } 309 310 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 311 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 312 313 static bool classof(const Stmt *T) { 314 return T->getStmtClass() >= firstExprConstant && 315 T->getStmtClass() <= lastExprConstant; 316 } 317 static bool classof(const Expr *) { return true; } 318}; 319 320 321//===----------------------------------------------------------------------===// 322// Primary Expressions. 323//===----------------------------------------------------------------------===// 324 325/// \brief Represents the qualifier that may precede a C++ name, e.g., the 326/// "std::" in "std::sort". 327struct NameQualifier { 328 /// \brief The nested name specifier. 329 NestedNameSpecifier *NNS; 330 331 /// \brief The source range covered by the nested name specifier. 332 SourceRange Range; 333}; 334 335/// \brief Represents an explicit template argument list in C++, e.g., 336/// the "<int>" in "sort<int>". 337struct ExplicitTemplateArgumentList { 338 /// \brief The source location of the left angle bracket ('<'); 339 SourceLocation LAngleLoc; 340 341 /// \brief The source location of the right angle bracket ('>'); 342 SourceLocation RAngleLoc; 343 344 /// \brief The number of template arguments in TemplateArgs. 345 /// The actual template arguments (if any) are stored after the 346 /// ExplicitTemplateArgumentList structure. 347 unsigned NumTemplateArgs; 348 349 /// \brief Retrieve the template arguments 350 TemplateArgument *getTemplateArgs() { 351 return reinterpret_cast<TemplateArgument *> (this + 1); 352 } 353 354 /// \brief Retrieve the template arguments 355 const TemplateArgument *getTemplateArgs() const { 356 return reinterpret_cast<const TemplateArgument *> (this + 1); 357 } 358}; 359 360/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 361/// enum, etc. 362class DeclRefExpr : public Expr { 363 enum { 364 // Flag on DecoratedD that specifies when this declaration reference 365 // expression has a C++ nested-name-specifier. 366 HasQualifierFlag = 0x01, 367 // Flag on DecoratedD that specifies when this declaration reference 368 // expression has an explicit C++ template argument list. 369 HasExplicitTemplateArgumentListFlag = 0x02 370 }; 371 372 // DecoratedD - The declaration that we are referencing, plus two bits to 373 // indicate whether (1) the declaration's name was explicitly qualified and 374 // (2) the declaration's name was followed by an explicit template 375 // argument list. 376 llvm::PointerIntPair<NamedDecl *, 2> DecoratedD; 377 378 // Loc - The location of the declaration name itself. 379 SourceLocation Loc; 380 381 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 382 NameQualifier *getNameQualifier() { 383 if (DecoratedD.getInt() & HasQualifierFlag == 0) 384 return 0; 385 386 return reinterpret_cast<NameQualifier *> (this + 1); 387 } 388 389 /// \brief Retrieve the qualifier that preceded the member name, if any. 390 const NameQualifier *getNameQualifier() const { 391 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 392 } 393 394 /// \brief Retrieve the explicit template argument list that followed the 395 /// member template name, if any. 396 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 397 if (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag == 0) 398 return 0; 399 400 if (DecoratedD.getInt() & HasQualifierFlag == 0) 401 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 402 403 return reinterpret_cast<ExplicitTemplateArgumentList *>( 404 getNameQualifier() + 1); 405 } 406 407 /// \brief Retrieve the explicit template argument list that followed the 408 /// member template name, if any. 409 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 410 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 411 } 412 413 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 414 NamedDecl *D, SourceLocation NameLoc, 415 bool HasExplicitTemplateArgumentList, 416 SourceLocation LAngleLoc, 417 const TemplateArgument *ExplicitTemplateArgs, 418 unsigned NumExplicitTemplateArgs, 419 SourceLocation RAngleLoc, 420 QualType T, bool TD, bool VD); 421 422protected: 423 // FIXME: Eventually, this constructor will go away and all subclasses 424 // will have to provide the type- and value-dependent flags. 425 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 426 Expr(SC, t), DecoratedD(d, 0), Loc(l) {} 427 428 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 429 bool VD) : 430 Expr(SC, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 431 432public: 433 // FIXME: Eventually, this constructor will go away and all clients 434 // will have to provide the type- and value-dependent flags. 435 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 436 Expr(DeclRefExprClass, t), DecoratedD(d, 0), Loc(l) {} 437 438 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 439 Expr(DeclRefExprClass, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 440 441 /// \brief Construct an empty declaration reference expression. 442 explicit DeclRefExpr(EmptyShell Empty) 443 : Expr(DeclRefExprClass, Empty) { } 444 445 static DeclRefExpr *Create(ASTContext &Context, 446 NestedNameSpecifier *Qualifier, 447 SourceRange QualifierRange, 448 NamedDecl *D, 449 SourceLocation NameLoc, 450 QualType T, bool TD, bool VD); 451 452 static DeclRefExpr *Create(ASTContext &Context, 453 NestedNameSpecifier *Qualifier, 454 SourceRange QualifierRange, 455 NamedDecl *D, 456 SourceLocation NameLoc, 457 bool HasExplicitTemplateArgumentList, 458 SourceLocation LAngleLoc, 459 const TemplateArgument *ExplicitTemplateArgs, 460 unsigned NumExplicitTemplateArgs, 461 SourceLocation RAngleLoc, 462 QualType T, bool TD, bool VD); 463 464 NamedDecl *getDecl() { return DecoratedD.getPointer(); } 465 const NamedDecl *getDecl() const { return DecoratedD.getPointer(); } 466 void setDecl(NamedDecl *NewD) { DecoratedD.setPointer(NewD); } 467 468 SourceLocation getLocation() const { return Loc; } 469 void setLocation(SourceLocation L) { Loc = L; } 470 virtual SourceRange getSourceRange() const; 471 472 /// \brief Determine whether this declaration reference was preceded by a 473 /// C++ nested-name-specifier, e.g., \c N::foo. 474 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 475 476 /// \brief If the name was qualified, retrieves the source range of 477 /// the nested-name-specifier that precedes the name. Otherwise, 478 /// returns an empty source range. 479 SourceRange getQualifierRange() const { 480 if (!hasQualifier()) 481 return SourceRange(); 482 483 return getNameQualifier()->Range; 484 } 485 486 /// \brief If the name was qualified, retrieves the nested-name-specifier 487 /// that precedes the name. Otherwise, returns NULL. 488 NestedNameSpecifier *getQualifier() const { 489 if (!hasQualifier()) 490 return 0; 491 492 return getNameQualifier()->NNS; 493 } 494 495 /// \brief Determines whether this member expression actually had a C++ 496 /// template argument list explicitly specified, e.g., x.f<int>. 497 bool hasExplicitTemplateArgumentList() const { 498 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 499 } 500 501 /// \brief Retrieve the location of the left angle bracket following the 502 /// member name ('<'), if any. 503 SourceLocation getLAngleLoc() const { 504 if (!hasExplicitTemplateArgumentList()) 505 return SourceLocation(); 506 507 return getExplicitTemplateArgumentList()->LAngleLoc; 508 } 509 510 /// \brief Retrieve the template arguments provided as part of this 511 /// template-id. 512 const TemplateArgument *getTemplateArgs() const { 513 if (!hasExplicitTemplateArgumentList()) 514 return 0; 515 516 return getExplicitTemplateArgumentList()->getTemplateArgs(); 517 } 518 519 /// \brief Retrieve the number of template arguments provided as part of this 520 /// template-id. 521 unsigned getNumTemplateArgs() const { 522 if (!hasExplicitTemplateArgumentList()) 523 return 0; 524 525 return getExplicitTemplateArgumentList()->NumTemplateArgs; 526 } 527 528 /// \brief Retrieve the location of the right angle bracket following the 529 /// template arguments ('>'). 530 SourceLocation getRAngleLoc() const { 531 if (!hasExplicitTemplateArgumentList()) 532 return SourceLocation(); 533 534 return getExplicitTemplateArgumentList()->RAngleLoc; 535 } 536 537 static bool classof(const Stmt *T) { 538 return T->getStmtClass() == DeclRefExprClass || 539 T->getStmtClass() == CXXConditionDeclExprClass; 540 } 541 static bool classof(const DeclRefExpr *) { return true; } 542 543 // Iterators 544 virtual child_iterator child_begin(); 545 virtual child_iterator child_end(); 546}; 547 548/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 549class PredefinedExpr : public Expr { 550public: 551 enum IdentType { 552 Func, 553 Function, 554 PrettyFunction 555 }; 556 557private: 558 SourceLocation Loc; 559 IdentType Type; 560public: 561 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 562 : Expr(PredefinedExprClass, type, type->isDependentType(), 563 type->isDependentType()), Loc(l), Type(IT) {} 564 565 /// \brief Construct an empty predefined expression. 566 explicit PredefinedExpr(EmptyShell Empty) 567 : Expr(PredefinedExprClass, Empty) { } 568 569 IdentType getIdentType() const { return Type; } 570 void setIdentType(IdentType IT) { Type = IT; } 571 572 SourceLocation getLocation() const { return Loc; } 573 void setLocation(SourceLocation L) { Loc = L; } 574 575 static std::string ComputeName(ASTContext &Context, IdentType IT, 576 const Decl *CurrentDecl); 577 578 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 579 580 static bool classof(const Stmt *T) { 581 return T->getStmtClass() == PredefinedExprClass; 582 } 583 static bool classof(const PredefinedExpr *) { return true; } 584 585 // Iterators 586 virtual child_iterator child_begin(); 587 virtual child_iterator child_end(); 588}; 589 590class IntegerLiteral : public Expr { 591 llvm::APInt Value; 592 SourceLocation Loc; 593public: 594 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 595 // or UnsignedLongLongTy 596 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 597 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 598 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 599 } 600 601 /// \brief Construct an empty integer literal. 602 explicit IntegerLiteral(EmptyShell Empty) 603 : Expr(IntegerLiteralClass, Empty) { } 604 605 const llvm::APInt &getValue() const { return Value; } 606 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 607 608 /// \brief Retrieve the location of the literal. 609 SourceLocation getLocation() const { return Loc; } 610 611 void setValue(const llvm::APInt &Val) { Value = Val; } 612 void setLocation(SourceLocation Location) { Loc = Location; } 613 614 static bool classof(const Stmt *T) { 615 return T->getStmtClass() == IntegerLiteralClass; 616 } 617 static bool classof(const IntegerLiteral *) { return true; } 618 619 // Iterators 620 virtual child_iterator child_begin(); 621 virtual child_iterator child_end(); 622}; 623 624class CharacterLiteral : public Expr { 625 unsigned Value; 626 SourceLocation Loc; 627 bool IsWide; 628public: 629 // type should be IntTy 630 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 631 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 632 } 633 634 /// \brief Construct an empty character literal. 635 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 636 637 SourceLocation getLocation() const { return Loc; } 638 bool isWide() const { return IsWide; } 639 640 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 641 642 unsigned getValue() const { return Value; } 643 644 void setLocation(SourceLocation Location) { Loc = Location; } 645 void setWide(bool W) { IsWide = W; } 646 void setValue(unsigned Val) { Value = Val; } 647 648 static bool classof(const Stmt *T) { 649 return T->getStmtClass() == CharacterLiteralClass; 650 } 651 static bool classof(const CharacterLiteral *) { return true; } 652 653 // Iterators 654 virtual child_iterator child_begin(); 655 virtual child_iterator child_end(); 656}; 657 658class FloatingLiteral : public Expr { 659 llvm::APFloat Value; 660 bool IsExact : 1; 661 SourceLocation Loc; 662public: 663 FloatingLiteral(const llvm::APFloat &V, bool isexact, 664 QualType Type, SourceLocation L) 665 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 666 667 /// \brief Construct an empty floating-point literal. 668 explicit FloatingLiteral(EmptyShell Empty) 669 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 670 671 const llvm::APFloat &getValue() const { return Value; } 672 void setValue(const llvm::APFloat &Val) { Value = Val; } 673 674 bool isExact() const { return IsExact; } 675 void setExact(bool E) { IsExact = E; } 676 677 /// getValueAsApproximateDouble - This returns the value as an inaccurate 678 /// double. Note that this may cause loss of precision, but is useful for 679 /// debugging dumps, etc. 680 double getValueAsApproximateDouble() const; 681 682 SourceLocation getLocation() const { return Loc; } 683 void setLocation(SourceLocation L) { Loc = L; } 684 685 // FIXME: The logic for computing the value of a predefined expr should go 686 // into a method here that takes the inner-most code decl (a block, function 687 // or objc method) that the expr lives in. This would allow sema and codegen 688 // to be consistent for things like sizeof(__func__) etc. 689 690 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 691 692 static bool classof(const Stmt *T) { 693 return T->getStmtClass() == FloatingLiteralClass; 694 } 695 static bool classof(const FloatingLiteral *) { return true; } 696 697 // Iterators 698 virtual child_iterator child_begin(); 699 virtual child_iterator child_end(); 700}; 701 702/// ImaginaryLiteral - We support imaginary integer and floating point literals, 703/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 704/// IntegerLiteral classes. Instances of this class always have a Complex type 705/// whose element type matches the subexpression. 706/// 707class ImaginaryLiteral : public Expr { 708 Stmt *Val; 709public: 710 ImaginaryLiteral(Expr *val, QualType Ty) 711 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 712 713 /// \brief Build an empty imaginary literal. 714 explicit ImaginaryLiteral(EmptyShell Empty) 715 : Expr(ImaginaryLiteralClass, Empty) { } 716 717 const Expr *getSubExpr() const { return cast<Expr>(Val); } 718 Expr *getSubExpr() { return cast<Expr>(Val); } 719 void setSubExpr(Expr *E) { Val = E; } 720 721 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 722 static bool classof(const Stmt *T) { 723 return T->getStmtClass() == ImaginaryLiteralClass; 724 } 725 static bool classof(const ImaginaryLiteral *) { return true; } 726 727 // Iterators 728 virtual child_iterator child_begin(); 729 virtual child_iterator child_end(); 730}; 731 732/// StringLiteral - This represents a string literal expression, e.g. "foo" 733/// or L"bar" (wide strings). The actual string is returned by getStrData() 734/// is NOT null-terminated, and the length of the string is determined by 735/// calling getByteLength(). The C type for a string is always a 736/// ConstantArrayType. In C++, the char type is const qualified, in C it is 737/// not. 738/// 739/// Note that strings in C can be formed by concatenation of multiple string 740/// literal pptokens in translation phase #6. This keeps track of the locations 741/// of each of these pieces. 742/// 743/// Strings in C can also be truncated and extended by assigning into arrays, 744/// e.g. with constructs like: 745/// char X[2] = "foobar"; 746/// In this case, getByteLength() will return 6, but the string literal will 747/// have type "char[2]". 748class StringLiteral : public Expr { 749 const char *StrData; 750 unsigned ByteLength; 751 bool IsWide; 752 unsigned NumConcatenated; 753 SourceLocation TokLocs[1]; 754 755 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 756 757protected: 758 virtual void DoDestroy(ASTContext &C); 759 760public: 761 /// This is the "fully general" constructor that allows representation of 762 /// strings formed from multiple concatenated tokens. 763 static StringLiteral *Create(ASTContext &C, const char *StrData, 764 unsigned ByteLength, bool Wide, QualType Ty, 765 const SourceLocation *Loc, unsigned NumStrs); 766 767 /// Simple constructor for string literals made from one token. 768 static StringLiteral *Create(ASTContext &C, const char *StrData, 769 unsigned ByteLength, 770 bool Wide, QualType Ty, SourceLocation Loc) { 771 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 772 } 773 774 /// \brief Construct an empty string literal. 775 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 776 777 llvm::StringRef getString() const { 778 return llvm::StringRef(StrData, ByteLength); 779 } 780 // FIXME: These are deprecated, replace with StringRef. 781 const char *getStrData() const { return StrData; } 782 unsigned getByteLength() const { return ByteLength; } 783 784 /// \brief Sets the string data to the given string data. 785 void setString(ASTContext &C, llvm::StringRef Str); 786 787 bool isWide() const { return IsWide; } 788 void setWide(bool W) { IsWide = W; } 789 790 bool containsNonAsciiOrNull() const { 791 llvm::StringRef Str = getString(); 792 for (unsigned i = 0, e = Str.size(); i != e; ++i) 793 if (!isascii(Str[i]) || !Str[i]) 794 return true; 795 return false; 796 } 797 /// getNumConcatenated - Get the number of string literal tokens that were 798 /// concatenated in translation phase #6 to form this string literal. 799 unsigned getNumConcatenated() const { return NumConcatenated; } 800 801 SourceLocation getStrTokenLoc(unsigned TokNum) const { 802 assert(TokNum < NumConcatenated && "Invalid tok number"); 803 return TokLocs[TokNum]; 804 } 805 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 806 assert(TokNum < NumConcatenated && "Invalid tok number"); 807 TokLocs[TokNum] = L; 808 } 809 810 typedef const SourceLocation *tokloc_iterator; 811 tokloc_iterator tokloc_begin() const { return TokLocs; } 812 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 813 814 virtual SourceRange getSourceRange() const { 815 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 816 } 817 static bool classof(const Stmt *T) { 818 return T->getStmtClass() == StringLiteralClass; 819 } 820 static bool classof(const StringLiteral *) { return true; } 821 822 // Iterators 823 virtual child_iterator child_begin(); 824 virtual child_iterator child_end(); 825}; 826 827/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 828/// AST node is only formed if full location information is requested. 829class ParenExpr : public Expr { 830 SourceLocation L, R; 831 Stmt *Val; 832public: 833 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 834 : Expr(ParenExprClass, val->getType(), 835 val->isTypeDependent(), val->isValueDependent()), 836 L(l), R(r), Val(val) {} 837 838 /// \brief Construct an empty parenthesized expression. 839 explicit ParenExpr(EmptyShell Empty) 840 : Expr(ParenExprClass, Empty) { } 841 842 const Expr *getSubExpr() const { return cast<Expr>(Val); } 843 Expr *getSubExpr() { return cast<Expr>(Val); } 844 void setSubExpr(Expr *E) { Val = E; } 845 846 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 847 848 /// \brief Get the location of the left parentheses '('. 849 SourceLocation getLParen() const { return L; } 850 void setLParen(SourceLocation Loc) { L = Loc; } 851 852 /// \brief Get the location of the right parentheses ')'. 853 SourceLocation getRParen() const { return R; } 854 void setRParen(SourceLocation Loc) { R = Loc; } 855 856 static bool classof(const Stmt *T) { 857 return T->getStmtClass() == ParenExprClass; 858 } 859 static bool classof(const ParenExpr *) { return true; } 860 861 // Iterators 862 virtual child_iterator child_begin(); 863 virtual child_iterator child_end(); 864}; 865 866 867/// UnaryOperator - This represents the unary-expression's (except sizeof and 868/// alignof), the postinc/postdec operators from postfix-expression, and various 869/// extensions. 870/// 871/// Notes on various nodes: 872/// 873/// Real/Imag - These return the real/imag part of a complex operand. If 874/// applied to a non-complex value, the former returns its operand and the 875/// later returns zero in the type of the operand. 876/// 877/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 878/// subexpression is a compound literal with the various MemberExpr and 879/// ArraySubscriptExpr's applied to it. 880/// 881class UnaryOperator : public Expr { 882public: 883 // Note that additions to this should also update the StmtVisitor class. 884 enum Opcode { 885 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 886 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 887 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 888 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 889 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 890 Real, Imag, // "__real expr"/"__imag expr" Extension. 891 Extension, // __extension__ marker. 892 OffsetOf // __builtin_offsetof 893 }; 894private: 895 Stmt *Val; 896 Opcode Opc; 897 SourceLocation Loc; 898public: 899 900 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 901 : Expr(UnaryOperatorClass, type, 902 input->isTypeDependent() && opc != OffsetOf, 903 input->isValueDependent()), 904 Val(input), Opc(opc), Loc(l) {} 905 906 /// \brief Build an empty unary operator. 907 explicit UnaryOperator(EmptyShell Empty) 908 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 909 910 Opcode getOpcode() const { return Opc; } 911 void setOpcode(Opcode O) { Opc = O; } 912 913 Expr *getSubExpr() const { return cast<Expr>(Val); } 914 void setSubExpr(Expr *E) { Val = E; } 915 916 /// getOperatorLoc - Return the location of the operator. 917 SourceLocation getOperatorLoc() const { return Loc; } 918 void setOperatorLoc(SourceLocation L) { Loc = L; } 919 920 /// isPostfix - Return true if this is a postfix operation, like x++. 921 static bool isPostfix(Opcode Op) { 922 return Op == PostInc || Op == PostDec; 923 } 924 925 /// isPostfix - Return true if this is a prefix operation, like --x. 926 static bool isPrefix(Opcode Op) { 927 return Op == PreInc || Op == PreDec; 928 } 929 930 bool isPrefix() const { return isPrefix(Opc); } 931 bool isPostfix() const { return isPostfix(Opc); } 932 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 933 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 934 bool isOffsetOfOp() const { return Opc == OffsetOf; } 935 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 936 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 937 938 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 939 /// corresponds to, e.g. "sizeof" or "[pre]++" 940 static const char *getOpcodeStr(Opcode Op); 941 942 /// \brief Retrieve the unary opcode that corresponds to the given 943 /// overloaded operator. 944 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 945 946 /// \brief Retrieve the overloaded operator kind that corresponds to 947 /// the given unary opcode. 948 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 949 950 virtual SourceRange getSourceRange() const { 951 if (isPostfix()) 952 return SourceRange(Val->getLocStart(), Loc); 953 else 954 return SourceRange(Loc, Val->getLocEnd()); 955 } 956 virtual SourceLocation getExprLoc() const { return Loc; } 957 958 static bool classof(const Stmt *T) { 959 return T->getStmtClass() == UnaryOperatorClass; 960 } 961 static bool classof(const UnaryOperator *) { return true; } 962 963 // Iterators 964 virtual child_iterator child_begin(); 965 virtual child_iterator child_end(); 966}; 967 968/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 969/// types and expressions. 970class SizeOfAlignOfExpr : public Expr { 971 bool isSizeof : 1; // true if sizeof, false if alignof. 972 bool isType : 1; // true if operand is a type, false if an expression 973 union { 974 void *Ty; 975 Stmt *Ex; 976 } Argument; 977 SourceLocation OpLoc, RParenLoc; 978 979protected: 980 virtual void DoDestroy(ASTContext& C); 981 982public: 983 SizeOfAlignOfExpr(bool issizeof, QualType T, 984 QualType resultType, SourceLocation op, 985 SourceLocation rp) : 986 Expr(SizeOfAlignOfExprClass, resultType, 987 false, // Never type-dependent (C++ [temp.dep.expr]p3). 988 // Value-dependent if the argument is type-dependent. 989 T->isDependentType()), 990 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 991 Argument.Ty = T.getAsOpaquePtr(); 992 } 993 994 SizeOfAlignOfExpr(bool issizeof, Expr *E, 995 QualType resultType, SourceLocation op, 996 SourceLocation rp) : 997 Expr(SizeOfAlignOfExprClass, resultType, 998 false, // Never type-dependent (C++ [temp.dep.expr]p3). 999 // Value-dependent if the argument is type-dependent. 1000 E->isTypeDependent()), 1001 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1002 Argument.Ex = E; 1003 } 1004 1005 /// \brief Construct an empty sizeof/alignof expression. 1006 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1007 : Expr(SizeOfAlignOfExprClass, Empty) { } 1008 1009 bool isSizeOf() const { return isSizeof; } 1010 void setSizeof(bool S) { isSizeof = S; } 1011 1012 bool isArgumentType() const { return isType; } 1013 QualType getArgumentType() const { 1014 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1015 return QualType::getFromOpaquePtr(Argument.Ty); 1016 } 1017 Expr *getArgumentExpr() { 1018 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1019 return static_cast<Expr*>(Argument.Ex); 1020 } 1021 const Expr *getArgumentExpr() const { 1022 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1023 } 1024 1025 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1026 void setArgument(QualType T) { 1027 Argument.Ty = T.getAsOpaquePtr(); 1028 isType = true; 1029 } 1030 1031 /// Gets the argument type, or the type of the argument expression, whichever 1032 /// is appropriate. 1033 QualType getTypeOfArgument() const { 1034 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1035 } 1036 1037 SourceLocation getOperatorLoc() const { return OpLoc; } 1038 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1039 1040 SourceLocation getRParenLoc() const { return RParenLoc; } 1041 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1042 1043 virtual SourceRange getSourceRange() const { 1044 return SourceRange(OpLoc, RParenLoc); 1045 } 1046 1047 static bool classof(const Stmt *T) { 1048 return T->getStmtClass() == SizeOfAlignOfExprClass; 1049 } 1050 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1051 1052 // Iterators 1053 virtual child_iterator child_begin(); 1054 virtual child_iterator child_end(); 1055}; 1056 1057//===----------------------------------------------------------------------===// 1058// Postfix Operators. 1059//===----------------------------------------------------------------------===// 1060 1061/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1062class ArraySubscriptExpr : public Expr { 1063 enum { LHS, RHS, END_EXPR=2 }; 1064 Stmt* SubExprs[END_EXPR]; 1065 SourceLocation RBracketLoc; 1066public: 1067 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1068 SourceLocation rbracketloc) 1069 : Expr(ArraySubscriptExprClass, t, 1070 lhs->isTypeDependent() || rhs->isTypeDependent(), 1071 lhs->isValueDependent() || rhs->isValueDependent()), 1072 RBracketLoc(rbracketloc) { 1073 SubExprs[LHS] = lhs; 1074 SubExprs[RHS] = rhs; 1075 } 1076 1077 /// \brief Create an empty array subscript expression. 1078 explicit ArraySubscriptExpr(EmptyShell Shell) 1079 : Expr(ArraySubscriptExprClass, Shell) { } 1080 1081 /// An array access can be written A[4] or 4[A] (both are equivalent). 1082 /// - getBase() and getIdx() always present the normalized view: A[4]. 1083 /// In this case getBase() returns "A" and getIdx() returns "4". 1084 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1085 /// 4[A] getLHS() returns "4". 1086 /// Note: Because vector element access is also written A[4] we must 1087 /// predicate the format conversion in getBase and getIdx only on the 1088 /// the type of the RHS, as it is possible for the LHS to be a vector of 1089 /// integer type 1090 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1091 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1092 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1093 1094 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1095 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1096 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1097 1098 Expr *getBase() { 1099 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1100 } 1101 1102 const Expr *getBase() const { 1103 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1104 } 1105 1106 Expr *getIdx() { 1107 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1108 } 1109 1110 const Expr *getIdx() const { 1111 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1112 } 1113 1114 virtual SourceRange getSourceRange() const { 1115 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1116 } 1117 1118 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1119 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1120 1121 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1122 1123 static bool classof(const Stmt *T) { 1124 return T->getStmtClass() == ArraySubscriptExprClass; 1125 } 1126 static bool classof(const ArraySubscriptExpr *) { return true; } 1127 1128 // Iterators 1129 virtual child_iterator child_begin(); 1130 virtual child_iterator child_end(); 1131}; 1132 1133 1134/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1135/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1136/// while its subclasses may represent alternative syntax that (semantically) 1137/// results in a function call. For example, CXXOperatorCallExpr is 1138/// a subclass for overloaded operator calls that use operator syntax, e.g., 1139/// "str1 + str2" to resolve to a function call. 1140class CallExpr : public Expr { 1141 enum { FN=0, ARGS_START=1 }; 1142 Stmt **SubExprs; 1143 unsigned NumArgs; 1144 SourceLocation RParenLoc; 1145 1146protected: 1147 // This version of the constructor is for derived classes. 1148 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1149 QualType t, SourceLocation rparenloc); 1150 1151 virtual void DoDestroy(ASTContext& C); 1152 1153public: 1154 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1155 SourceLocation rparenloc); 1156 1157 /// \brief Build an empty call expression. 1158 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1159 1160 ~CallExpr() {} 1161 1162 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1163 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1164 void setCallee(Expr *F) { SubExprs[FN] = F; } 1165 1166 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1167 FunctionDecl *getDirectCallee(); 1168 const FunctionDecl *getDirectCallee() const { 1169 return const_cast<CallExpr*>(this)->getDirectCallee(); 1170 } 1171 1172 /// getNumArgs - Return the number of actual arguments to this call. 1173 /// 1174 unsigned getNumArgs() const { return NumArgs; } 1175 1176 /// getArg - Return the specified argument. 1177 Expr *getArg(unsigned Arg) { 1178 assert(Arg < NumArgs && "Arg access out of range!"); 1179 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1180 } 1181 const Expr *getArg(unsigned Arg) const { 1182 assert(Arg < NumArgs && "Arg access out of range!"); 1183 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1184 } 1185 1186 /// setArg - Set the specified argument. 1187 void setArg(unsigned Arg, Expr *ArgExpr) { 1188 assert(Arg < NumArgs && "Arg access out of range!"); 1189 SubExprs[Arg+ARGS_START] = ArgExpr; 1190 } 1191 1192 /// setNumArgs - This changes the number of arguments present in this call. 1193 /// Any orphaned expressions are deleted by this, and any new operands are set 1194 /// to null. 1195 void setNumArgs(ASTContext& C, unsigned NumArgs); 1196 1197 typedef ExprIterator arg_iterator; 1198 typedef ConstExprIterator const_arg_iterator; 1199 1200 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1201 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1202 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1203 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1204 1205 /// getNumCommas - Return the number of commas that must have been present in 1206 /// this function call. 1207 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1208 1209 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1210 /// not, return 0. 1211 unsigned isBuiltinCall(ASTContext &Context) const; 1212 1213 /// getCallReturnType - Get the return type of the call expr. This is not 1214 /// always the type of the expr itself, if the return type is a reference 1215 /// type. 1216 QualType getCallReturnType() const; 1217 1218 SourceLocation getRParenLoc() const { return RParenLoc; } 1219 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1220 1221 virtual SourceRange getSourceRange() const { 1222 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1223 } 1224 1225 static bool classof(const Stmt *T) { 1226 return T->getStmtClass() == CallExprClass || 1227 T->getStmtClass() == CXXOperatorCallExprClass || 1228 T->getStmtClass() == CXXMemberCallExprClass; 1229 } 1230 static bool classof(const CallExpr *) { return true; } 1231 static bool classof(const CXXOperatorCallExpr *) { return true; } 1232 static bool classof(const CXXMemberCallExpr *) { return true; } 1233 1234 // Iterators 1235 virtual child_iterator child_begin(); 1236 virtual child_iterator child_end(); 1237}; 1238 1239/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1240/// 1241class MemberExpr : public Expr { 1242 /// Base - the expression for the base pointer or structure references. In 1243 /// X.F, this is "X". 1244 Stmt *Base; 1245 1246 /// MemberDecl - This is the decl being referenced by the field/member name. 1247 /// In X.F, this is the decl referenced by F. 1248 NamedDecl *MemberDecl; 1249 1250 /// MemberLoc - This is the location of the member name. 1251 SourceLocation MemberLoc; 1252 1253 /// IsArrow - True if this is "X->F", false if this is "X.F". 1254 bool IsArrow : 1; 1255 1256 /// \brief True if this member expression used a nested-name-specifier to 1257 /// refer to the member, e.g., "x->Base::f". When true, a NameQualifier 1258 /// structure is allocated immediately after the MemberExpr. 1259 bool HasQualifier : 1; 1260 1261 /// \brief True if this member expression specified a template argument list 1262 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1263 /// structure (and its TemplateArguments) are allocated immediately after 1264 /// the MemberExpr or, if the member expression also has a qualifier, after 1265 /// the NameQualifier structure. 1266 bool HasExplicitTemplateArgumentList : 1; 1267 1268 /// \brief Retrieve the qualifier that preceded the member name, if any. 1269 NameQualifier *getMemberQualifier() { 1270 if (!HasQualifier) 1271 return 0; 1272 1273 return reinterpret_cast<NameQualifier *> (this + 1); 1274 } 1275 1276 /// \brief Retrieve the qualifier that preceded the member name, if any. 1277 const NameQualifier *getMemberQualifier() const { 1278 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1279 } 1280 1281 /// \brief Retrieve the explicit template argument list that followed the 1282 /// member template name, if any. 1283 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1284 if (!HasExplicitTemplateArgumentList) 1285 return 0; 1286 1287 if (!HasQualifier) 1288 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1289 1290 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1291 getMemberQualifier() + 1); 1292 } 1293 1294 /// \brief Retrieve the explicit template argument list that followed the 1295 /// member template name, if any. 1296 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1297 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1298 } 1299 1300 MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 1301 SourceRange qualrange, NamedDecl *memberdecl, SourceLocation l, 1302 bool has_explicit, SourceLocation langle, 1303 const TemplateArgument *targs, unsigned numtargs, 1304 SourceLocation rangle, QualType ty); 1305 1306public: 1307 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1308 QualType ty) 1309 : Expr(MemberExprClass, ty, 1310 base->isTypeDependent(), base->isValueDependent()), 1311 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1312 HasQualifier(false), HasExplicitTemplateArgumentList(false) {} 1313 1314 /// \brief Build an empty member reference expression. 1315 explicit MemberExpr(EmptyShell Empty) 1316 : Expr(MemberExprClass, Empty), HasQualifier(false), 1317 HasExplicitTemplateArgumentList(false) { } 1318 1319 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1320 NestedNameSpecifier *qual, SourceRange qualrange, 1321 NamedDecl *memberdecl, 1322 SourceLocation l, 1323 bool has_explicit, 1324 SourceLocation langle, 1325 const TemplateArgument *targs, 1326 unsigned numtargs, 1327 SourceLocation rangle, 1328 QualType ty); 1329 1330 void setBase(Expr *E) { Base = E; } 1331 Expr *getBase() const { return cast<Expr>(Base); } 1332 1333 /// \brief Retrieve the member declaration to which this expression refers. 1334 /// 1335 /// The returned declaration will either be a FieldDecl or (in C++) 1336 /// a CXXMethodDecl. 1337 NamedDecl *getMemberDecl() const { return MemberDecl; } 1338 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1339 1340 /// \brief Determines whether this member expression actually had 1341 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1342 /// x->Base::foo. 1343 bool hasQualifier() const { return HasQualifier; } 1344 1345 /// \brief If the member name was qualified, retrieves the source range of 1346 /// the nested-name-specifier that precedes the member name. Otherwise, 1347 /// returns an empty source range. 1348 SourceRange getQualifierRange() const { 1349 if (!HasQualifier) 1350 return SourceRange(); 1351 1352 return getMemberQualifier()->Range; 1353 } 1354 1355 /// \brief If the member name was qualified, retrieves the 1356 /// nested-name-specifier that precedes the member name. Otherwise, returns 1357 /// NULL. 1358 NestedNameSpecifier *getQualifier() const { 1359 if (!HasQualifier) 1360 return 0; 1361 1362 return getMemberQualifier()->NNS; 1363 } 1364 1365 /// \brief Determines whether this member expression actually had a C++ 1366 /// template argument list explicitly specified, e.g., x.f<int>. 1367 bool hasExplicitTemplateArgumentList() { 1368 return HasExplicitTemplateArgumentList; 1369 } 1370 1371 /// \brief Retrieve the location of the left angle bracket following the 1372 /// member name ('<'), if any. 1373 SourceLocation getLAngleLoc() const { 1374 if (!HasExplicitTemplateArgumentList) 1375 return SourceLocation(); 1376 1377 return getExplicitTemplateArgumentList()->LAngleLoc; 1378 } 1379 1380 /// \brief Retrieve the template arguments provided as part of this 1381 /// template-id. 1382 const TemplateArgument *getTemplateArgs() const { 1383 if (!HasExplicitTemplateArgumentList) 1384 return 0; 1385 1386 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1387 } 1388 1389 /// \brief Retrieve the number of template arguments provided as part of this 1390 /// template-id. 1391 unsigned getNumTemplateArgs() const { 1392 if (!HasExplicitTemplateArgumentList) 1393 return 0; 1394 1395 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1396 } 1397 1398 /// \brief Retrieve the location of the right angle bracket following the 1399 /// template arguments ('>'). 1400 SourceLocation getRAngleLoc() const { 1401 if (!HasExplicitTemplateArgumentList) 1402 return SourceLocation(); 1403 1404 return getExplicitTemplateArgumentList()->RAngleLoc; 1405 } 1406 1407 bool isArrow() const { return IsArrow; } 1408 void setArrow(bool A) { IsArrow = A; } 1409 1410 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1411 /// location of 'F'. 1412 SourceLocation getMemberLoc() const { return MemberLoc; } 1413 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1414 1415 virtual SourceRange getSourceRange() const { 1416 // If we have an implicit base (like a C++ implicit this), 1417 // make sure not to return its location 1418 SourceLocation EndLoc = MemberLoc; 1419 if (HasExplicitTemplateArgumentList) 1420 EndLoc = getRAngleLoc(); 1421 1422 SourceLocation BaseLoc = getBase()->getLocStart(); 1423 if (BaseLoc.isInvalid()) 1424 return SourceRange(MemberLoc, EndLoc); 1425 return SourceRange(BaseLoc, EndLoc); 1426 } 1427 1428 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1429 1430 static bool classof(const Stmt *T) { 1431 return T->getStmtClass() == MemberExprClass; 1432 } 1433 static bool classof(const MemberExpr *) { return true; } 1434 1435 // Iterators 1436 virtual child_iterator child_begin(); 1437 virtual child_iterator child_end(); 1438}; 1439 1440/// CompoundLiteralExpr - [C99 6.5.2.5] 1441/// 1442class CompoundLiteralExpr : public Expr { 1443 /// LParenLoc - If non-null, this is the location of the left paren in a 1444 /// compound literal like "(int){4}". This can be null if this is a 1445 /// synthesized compound expression. 1446 SourceLocation LParenLoc; 1447 Stmt *Init; 1448 bool FileScope; 1449public: 1450 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1451 bool fileScope) 1452 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1453 FileScope(fileScope) {} 1454 1455 /// \brief Construct an empty compound literal. 1456 explicit CompoundLiteralExpr(EmptyShell Empty) 1457 : Expr(CompoundLiteralExprClass, Empty) { } 1458 1459 const Expr *getInitializer() const { return cast<Expr>(Init); } 1460 Expr *getInitializer() { return cast<Expr>(Init); } 1461 void setInitializer(Expr *E) { Init = E; } 1462 1463 bool isFileScope() const { return FileScope; } 1464 void setFileScope(bool FS) { FileScope = FS; } 1465 1466 SourceLocation getLParenLoc() const { return LParenLoc; } 1467 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1468 1469 virtual SourceRange getSourceRange() const { 1470 // FIXME: Init should never be null. 1471 if (!Init) 1472 return SourceRange(); 1473 if (LParenLoc.isInvalid()) 1474 return Init->getSourceRange(); 1475 return SourceRange(LParenLoc, Init->getLocEnd()); 1476 } 1477 1478 static bool classof(const Stmt *T) { 1479 return T->getStmtClass() == CompoundLiteralExprClass; 1480 } 1481 static bool classof(const CompoundLiteralExpr *) { return true; } 1482 1483 // Iterators 1484 virtual child_iterator child_begin(); 1485 virtual child_iterator child_end(); 1486}; 1487 1488/// CastExpr - Base class for type casts, including both implicit 1489/// casts (ImplicitCastExpr) and explicit casts that have some 1490/// representation in the source code (ExplicitCastExpr's derived 1491/// classes). 1492class CastExpr : public Expr { 1493public: 1494 /// CastKind - the kind of cast this represents. 1495 enum CastKind { 1496 /// CK_Unknown - Unknown cast kind. 1497 /// FIXME: The goal is to get rid of this and make all casts have a 1498 /// kind so that the AST client doesn't have to try to figure out what's 1499 /// going on. 1500 CK_Unknown, 1501 1502 /// CK_BitCast - Used for reinterpret_cast. 1503 CK_BitCast, 1504 1505 /// CK_NoOp - Used for const_cast. 1506 CK_NoOp, 1507 1508 /// CK_DerivedToBase - Derived to base class casts. 1509 CK_DerivedToBase, 1510 1511 /// CK_Dynamic - Dynamic cast. 1512 CK_Dynamic, 1513 1514 /// CK_ToUnion - Cast to union (GCC extension). 1515 CK_ToUnion, 1516 1517 /// CK_ArrayToPointerDecay - Array to pointer decay. 1518 CK_ArrayToPointerDecay, 1519 1520 // CK_FunctionToPointerDecay - Function to pointer decay. 1521 CK_FunctionToPointerDecay, 1522 1523 /// CK_NullToMemberPointer - Null pointer to member pointer. 1524 CK_NullToMemberPointer, 1525 1526 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1527 /// member pointer in derived class. 1528 CK_BaseToDerivedMemberPointer, 1529 1530 /// CK_UserDefinedConversion - Conversion using a user defined type 1531 /// conversion function. 1532 CK_UserDefinedConversion, 1533 1534 /// CK_ConstructorConversion - Conversion by constructor 1535 CK_ConstructorConversion, 1536 1537 /// CK_IntegralToPointer - Integral to pointer 1538 CK_IntegralToPointer, 1539 1540 /// CK_PointerToIntegral - Pointer to integral 1541 CK_PointerToIntegral, 1542 1543 /// CK_ToVoid - Cast to void. 1544 CK_ToVoid, 1545 1546 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1547 /// vector type with the same element type as the src type. Splats the 1548 /// src expression into the destination expression. 1549 CK_VectorSplat, 1550 1551 /// CK_IntegralCast - Casting between integral types of different size. 1552 CK_IntegralCast, 1553 1554 /// CK_IntegralToFloating - Integral to floating point. 1555 CK_IntegralToFloating, 1556 1557 /// CK_FloatingToIntegral - Floating point to integral. 1558 CK_FloatingToIntegral, 1559 1560 /// CK_FloatingCast - Casting between floating types of different size. 1561 CK_FloatingCast 1562 }; 1563 1564private: 1565 CastKind Kind; 1566 Stmt *Op; 1567protected: 1568 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op) : 1569 Expr(SC, ty, 1570 // Cast expressions are type-dependent if the type is 1571 // dependent (C++ [temp.dep.expr]p3). 1572 ty->isDependentType(), 1573 // Cast expressions are value-dependent if the type is 1574 // dependent or if the subexpression is value-dependent. 1575 ty->isDependentType() || (op && op->isValueDependent())), 1576 Kind(kind), Op(op) {} 1577 1578 /// \brief Construct an empty cast. 1579 CastExpr(StmtClass SC, EmptyShell Empty) 1580 : Expr(SC, Empty) { } 1581 1582public: 1583 CastKind getCastKind() const { return Kind; } 1584 void setCastKind(CastKind K) { Kind = K; } 1585 const char *getCastKindName() const; 1586 1587 Expr *getSubExpr() { return cast<Expr>(Op); } 1588 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1589 void setSubExpr(Expr *E) { Op = E; } 1590 1591 static bool classof(const Stmt *T) { 1592 StmtClass SC = T->getStmtClass(); 1593 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1594 return true; 1595 1596 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1597 return true; 1598 1599 return false; 1600 } 1601 static bool classof(const CastExpr *) { return true; } 1602 1603 // Iterators 1604 virtual child_iterator child_begin(); 1605 virtual child_iterator child_end(); 1606}; 1607 1608/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1609/// conversions, which have no direct representation in the original 1610/// source code. For example: converting T[]->T*, void f()->void 1611/// (*f)(), float->double, short->int, etc. 1612/// 1613/// In C, implicit casts always produce rvalues. However, in C++, an 1614/// implicit cast whose result is being bound to a reference will be 1615/// an lvalue. For example: 1616/// 1617/// @code 1618/// class Base { }; 1619/// class Derived : public Base { }; 1620/// void f(Derived d) { 1621/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1622/// } 1623/// @endcode 1624class ImplicitCastExpr : public CastExpr { 1625 /// LvalueCast - Whether this cast produces an lvalue. 1626 bool LvalueCast; 1627 1628public: 1629 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1630 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1631 1632 /// \brief Construct an empty implicit cast. 1633 explicit ImplicitCastExpr(EmptyShell Shell) 1634 : CastExpr(ImplicitCastExprClass, Shell) { } 1635 1636 1637 virtual SourceRange getSourceRange() const { 1638 return getSubExpr()->getSourceRange(); 1639 } 1640 1641 /// isLvalueCast - Whether this cast produces an lvalue. 1642 bool isLvalueCast() const { return LvalueCast; } 1643 1644 /// setLvalueCast - Set whether this cast produces an lvalue. 1645 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1646 1647 static bool classof(const Stmt *T) { 1648 return T->getStmtClass() == ImplicitCastExprClass; 1649 } 1650 static bool classof(const ImplicitCastExpr *) { return true; } 1651}; 1652 1653/// ExplicitCastExpr - An explicit cast written in the source 1654/// code. 1655/// 1656/// This class is effectively an abstract class, because it provides 1657/// the basic representation of an explicitly-written cast without 1658/// specifying which kind of cast (C cast, functional cast, static 1659/// cast, etc.) was written; specific derived classes represent the 1660/// particular style of cast and its location information. 1661/// 1662/// Unlike implicit casts, explicit cast nodes have two different 1663/// types: the type that was written into the source code, and the 1664/// actual type of the expression as determined by semantic 1665/// analysis. These types may differ slightly. For example, in C++ one 1666/// can cast to a reference type, which indicates that the resulting 1667/// expression will be an lvalue. The reference type, however, will 1668/// not be used as the type of the expression. 1669class ExplicitCastExpr : public CastExpr { 1670 /// TypeAsWritten - The type that this expression is casting to, as 1671 /// written in the source code. 1672 QualType TypeAsWritten; 1673 1674protected: 1675 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1676 Expr *op, QualType writtenTy) 1677 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1678 1679 /// \brief Construct an empty explicit cast. 1680 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1681 : CastExpr(SC, Shell) { } 1682 1683public: 1684 /// getTypeAsWritten - Returns the type that this expression is 1685 /// casting to, as written in the source code. 1686 QualType getTypeAsWritten() const { return TypeAsWritten; } 1687 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1688 1689 static bool classof(const Stmt *T) { 1690 StmtClass SC = T->getStmtClass(); 1691 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1692 return true; 1693 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1694 return true; 1695 1696 return false; 1697 } 1698 static bool classof(const ExplicitCastExpr *) { return true; } 1699}; 1700 1701/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1702/// cast in C++ (C++ [expr.cast]), which uses the syntax 1703/// (Type)expr. For example: @c (int)f. 1704class CStyleCastExpr : public ExplicitCastExpr { 1705 SourceLocation LPLoc; // the location of the left paren 1706 SourceLocation RPLoc; // the location of the right paren 1707public: 1708 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1709 SourceLocation l, SourceLocation r) : 1710 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1711 LPLoc(l), RPLoc(r) {} 1712 1713 /// \brief Construct an empty C-style explicit cast. 1714 explicit CStyleCastExpr(EmptyShell Shell) 1715 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1716 1717 SourceLocation getLParenLoc() const { return LPLoc; } 1718 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1719 1720 SourceLocation getRParenLoc() const { return RPLoc; } 1721 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1722 1723 virtual SourceRange getSourceRange() const { 1724 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1725 } 1726 static bool classof(const Stmt *T) { 1727 return T->getStmtClass() == CStyleCastExprClass; 1728 } 1729 static bool classof(const CStyleCastExpr *) { return true; } 1730}; 1731 1732/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1733/// 1734/// This expression node kind describes a builtin binary operation, 1735/// such as "x + y" for integer values "x" and "y". The operands will 1736/// already have been converted to appropriate types (e.g., by 1737/// performing promotions or conversions). 1738/// 1739/// In C++, where operators may be overloaded, a different kind of 1740/// expression node (CXXOperatorCallExpr) is used to express the 1741/// invocation of an overloaded operator with operator syntax. Within 1742/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1743/// used to store an expression "x + y" depends on the subexpressions 1744/// for x and y. If neither x or y is type-dependent, and the "+" 1745/// operator resolves to a built-in operation, BinaryOperator will be 1746/// used to express the computation (x and y may still be 1747/// value-dependent). If either x or y is type-dependent, or if the 1748/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1749/// be used to express the computation. 1750class BinaryOperator : public Expr { 1751public: 1752 enum Opcode { 1753 // Operators listed in order of precedence. 1754 // Note that additions to this should also update the StmtVisitor class. 1755 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1756 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1757 Add, Sub, // [C99 6.5.6] Additive operators. 1758 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1759 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1760 EQ, NE, // [C99 6.5.9] Equality operators. 1761 And, // [C99 6.5.10] Bitwise AND operator. 1762 Xor, // [C99 6.5.11] Bitwise XOR operator. 1763 Or, // [C99 6.5.12] Bitwise OR operator. 1764 LAnd, // [C99 6.5.13] Logical AND operator. 1765 LOr, // [C99 6.5.14] Logical OR operator. 1766 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1767 DivAssign, RemAssign, 1768 AddAssign, SubAssign, 1769 ShlAssign, ShrAssign, 1770 AndAssign, XorAssign, 1771 OrAssign, 1772 Comma // [C99 6.5.17] Comma operator. 1773 }; 1774private: 1775 enum { LHS, RHS, END_EXPR }; 1776 Stmt* SubExprs[END_EXPR]; 1777 Opcode Opc; 1778 SourceLocation OpLoc; 1779public: 1780 1781 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1782 SourceLocation opLoc) 1783 : Expr(BinaryOperatorClass, ResTy, 1784 lhs->isTypeDependent() || rhs->isTypeDependent(), 1785 lhs->isValueDependent() || rhs->isValueDependent()), 1786 Opc(opc), OpLoc(opLoc) { 1787 SubExprs[LHS] = lhs; 1788 SubExprs[RHS] = rhs; 1789 assert(!isCompoundAssignmentOp() && 1790 "Use ArithAssignBinaryOperator for compound assignments"); 1791 } 1792 1793 /// \brief Construct an empty binary operator. 1794 explicit BinaryOperator(EmptyShell Empty) 1795 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1796 1797 SourceLocation getOperatorLoc() const { return OpLoc; } 1798 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1799 1800 Opcode getOpcode() const { return Opc; } 1801 void setOpcode(Opcode O) { Opc = O; } 1802 1803 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1804 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1805 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1806 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1807 1808 virtual SourceRange getSourceRange() const { 1809 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1810 } 1811 1812 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1813 /// corresponds to, e.g. "<<=". 1814 static const char *getOpcodeStr(Opcode Op); 1815 1816 /// \brief Retrieve the binary opcode that corresponds to the given 1817 /// overloaded operator. 1818 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1819 1820 /// \brief Retrieve the overloaded operator kind that corresponds to 1821 /// the given binary opcode. 1822 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1823 1824 /// predicates to categorize the respective opcodes. 1825 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1826 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1827 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1828 bool isShiftOp() const { return isShiftOp(Opc); } 1829 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1830 1831 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1832 bool isRelationalOp() const { return isRelationalOp(Opc); } 1833 1834 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1835 bool isEqualityOp() const { return isEqualityOp(Opc); } 1836 1837 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1838 bool isLogicalOp() const { return isLogicalOp(Opc); } 1839 1840 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1841 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1842 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1843 1844 static bool classof(const Stmt *S) { 1845 return S->getStmtClass() == BinaryOperatorClass || 1846 S->getStmtClass() == CompoundAssignOperatorClass; 1847 } 1848 static bool classof(const BinaryOperator *) { return true; } 1849 1850 // Iterators 1851 virtual child_iterator child_begin(); 1852 virtual child_iterator child_end(); 1853 1854protected: 1855 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1856 SourceLocation oploc, bool dead) 1857 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1858 SubExprs[LHS] = lhs; 1859 SubExprs[RHS] = rhs; 1860 } 1861 1862 BinaryOperator(StmtClass SC, EmptyShell Empty) 1863 : Expr(SC, Empty), Opc(MulAssign) { } 1864}; 1865 1866/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1867/// track of the type the operation is performed in. Due to the semantics of 1868/// these operators, the operands are promoted, the aritmetic performed, an 1869/// implicit conversion back to the result type done, then the assignment takes 1870/// place. This captures the intermediate type which the computation is done 1871/// in. 1872class CompoundAssignOperator : public BinaryOperator { 1873 QualType ComputationLHSType; 1874 QualType ComputationResultType; 1875public: 1876 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1877 QualType ResType, QualType CompLHSType, 1878 QualType CompResultType, 1879 SourceLocation OpLoc) 1880 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1881 ComputationLHSType(CompLHSType), 1882 ComputationResultType(CompResultType) { 1883 assert(isCompoundAssignmentOp() && 1884 "Only should be used for compound assignments"); 1885 } 1886 1887 /// \brief Build an empty compound assignment operator expression. 1888 explicit CompoundAssignOperator(EmptyShell Empty) 1889 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1890 1891 // The two computation types are the type the LHS is converted 1892 // to for the computation and the type of the result; the two are 1893 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1894 QualType getComputationLHSType() const { return ComputationLHSType; } 1895 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1896 1897 QualType getComputationResultType() const { return ComputationResultType; } 1898 void setComputationResultType(QualType T) { ComputationResultType = T; } 1899 1900 static bool classof(const CompoundAssignOperator *) { return true; } 1901 static bool classof(const Stmt *S) { 1902 return S->getStmtClass() == CompoundAssignOperatorClass; 1903 } 1904}; 1905 1906/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1907/// GNU "missing LHS" extension is in use. 1908/// 1909class ConditionalOperator : public Expr { 1910 enum { COND, LHS, RHS, END_EXPR }; 1911 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1912 SourceLocation QuestionLoc, ColonLoc; 1913public: 1914 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1915 SourceLocation CLoc, Expr *rhs, QualType t) 1916 : Expr(ConditionalOperatorClass, t, 1917 // FIXME: the type of the conditional operator doesn't 1918 // depend on the type of the conditional, but the standard 1919 // seems to imply that it could. File a bug! 1920 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1921 (cond->isValueDependent() || 1922 (lhs && lhs->isValueDependent()) || 1923 (rhs && rhs->isValueDependent()))), 1924 QuestionLoc(QLoc), 1925 ColonLoc(CLoc) { 1926 SubExprs[COND] = cond; 1927 SubExprs[LHS] = lhs; 1928 SubExprs[RHS] = rhs; 1929 } 1930 1931 /// \brief Build an empty conditional operator. 1932 explicit ConditionalOperator(EmptyShell Empty) 1933 : Expr(ConditionalOperatorClass, Empty) { } 1934 1935 // getCond - Return the expression representing the condition for 1936 // the ?: operator. 1937 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1938 void setCond(Expr *E) { SubExprs[COND] = E; } 1939 1940 // getTrueExpr - Return the subexpression representing the value of the ?: 1941 // expression if the condition evaluates to true. In most cases this value 1942 // will be the same as getLHS() except a GCC extension allows the left 1943 // subexpression to be omitted, and instead of the condition be returned. 1944 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1945 // is only evaluated once. 1946 Expr *getTrueExpr() const { 1947 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1948 } 1949 1950 // getTrueExpr - Return the subexpression representing the value of the ?: 1951 // expression if the condition evaluates to false. This is the same as getRHS. 1952 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1953 1954 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1955 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1956 1957 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1958 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1959 1960 SourceLocation getQuestionLoc() const { return QuestionLoc; } 1961 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 1962 1963 SourceLocation getColonLoc() const { return ColonLoc; } 1964 void setColonLoc(SourceLocation L) { ColonLoc = L; } 1965 1966 virtual SourceRange getSourceRange() const { 1967 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1968 } 1969 static bool classof(const Stmt *T) { 1970 return T->getStmtClass() == ConditionalOperatorClass; 1971 } 1972 static bool classof(const ConditionalOperator *) { return true; } 1973 1974 // Iterators 1975 virtual child_iterator child_begin(); 1976 virtual child_iterator child_end(); 1977}; 1978 1979/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1980class AddrLabelExpr : public Expr { 1981 SourceLocation AmpAmpLoc, LabelLoc; 1982 LabelStmt *Label; 1983public: 1984 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1985 QualType t) 1986 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1987 1988 /// \brief Build an empty address of a label expression. 1989 explicit AddrLabelExpr(EmptyShell Empty) 1990 : Expr(AddrLabelExprClass, Empty) { } 1991 1992 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1993 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1994 SourceLocation getLabelLoc() const { return LabelLoc; } 1995 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1996 1997 virtual SourceRange getSourceRange() const { 1998 return SourceRange(AmpAmpLoc, LabelLoc); 1999 } 2000 2001 LabelStmt *getLabel() const { return Label; } 2002 void setLabel(LabelStmt *S) { Label = S; } 2003 2004 static bool classof(const Stmt *T) { 2005 return T->getStmtClass() == AddrLabelExprClass; 2006 } 2007 static bool classof(const AddrLabelExpr *) { return true; } 2008 2009 // Iterators 2010 virtual child_iterator child_begin(); 2011 virtual child_iterator child_end(); 2012}; 2013 2014/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2015/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2016/// takes the value of the last subexpression. 2017class StmtExpr : public Expr { 2018 Stmt *SubStmt; 2019 SourceLocation LParenLoc, RParenLoc; 2020public: 2021 StmtExpr(CompoundStmt *substmt, QualType T, 2022 SourceLocation lp, SourceLocation rp) : 2023 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2024 2025 /// \brief Build an empty statement expression. 2026 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2027 2028 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2029 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2030 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2031 2032 virtual SourceRange getSourceRange() const { 2033 return SourceRange(LParenLoc, RParenLoc); 2034 } 2035 2036 SourceLocation getLParenLoc() const { return LParenLoc; } 2037 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2038 SourceLocation getRParenLoc() const { return RParenLoc; } 2039 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2040 2041 static bool classof(const Stmt *T) { 2042 return T->getStmtClass() == StmtExprClass; 2043 } 2044 static bool classof(const StmtExpr *) { return true; } 2045 2046 // Iterators 2047 virtual child_iterator child_begin(); 2048 virtual child_iterator child_end(); 2049}; 2050 2051/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2052/// This AST node represents a function that returns 1 if two *types* (not 2053/// expressions) are compatible. The result of this built-in function can be 2054/// used in integer constant expressions. 2055class TypesCompatibleExpr : public Expr { 2056 QualType Type1; 2057 QualType Type2; 2058 SourceLocation BuiltinLoc, RParenLoc; 2059public: 2060 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2061 QualType t1, QualType t2, SourceLocation RP) : 2062 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 2063 BuiltinLoc(BLoc), RParenLoc(RP) {} 2064 2065 /// \brief Build an empty __builtin_type_compatible_p expression. 2066 explicit TypesCompatibleExpr(EmptyShell Empty) 2067 : Expr(TypesCompatibleExprClass, Empty) { } 2068 2069 QualType getArgType1() const { return Type1; } 2070 void setArgType1(QualType T) { Type1 = T; } 2071 QualType getArgType2() const { return Type2; } 2072 void setArgType2(QualType T) { Type2 = T; } 2073 2074 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2075 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2076 2077 SourceLocation getRParenLoc() const { return RParenLoc; } 2078 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2079 2080 virtual SourceRange getSourceRange() const { 2081 return SourceRange(BuiltinLoc, RParenLoc); 2082 } 2083 static bool classof(const Stmt *T) { 2084 return T->getStmtClass() == TypesCompatibleExprClass; 2085 } 2086 static bool classof(const TypesCompatibleExpr *) { return true; } 2087 2088 // Iterators 2089 virtual child_iterator child_begin(); 2090 virtual child_iterator child_end(); 2091}; 2092 2093/// ShuffleVectorExpr - clang-specific builtin-in function 2094/// __builtin_shufflevector. 2095/// This AST node represents a operator that does a constant 2096/// shuffle, similar to LLVM's shufflevector instruction. It takes 2097/// two vectors and a variable number of constant indices, 2098/// and returns the appropriately shuffled vector. 2099class ShuffleVectorExpr : public Expr { 2100 SourceLocation BuiltinLoc, RParenLoc; 2101 2102 // SubExprs - the list of values passed to the __builtin_shufflevector 2103 // function. The first two are vectors, and the rest are constant 2104 // indices. The number of values in this list is always 2105 // 2+the number of indices in the vector type. 2106 Stmt **SubExprs; 2107 unsigned NumExprs; 2108 2109protected: 2110 virtual void DoDestroy(ASTContext &C); 2111 2112public: 2113 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2114 QualType Type, SourceLocation BLoc, 2115 SourceLocation RP) : 2116 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 2117 RParenLoc(RP), NumExprs(nexpr) { 2118 2119 SubExprs = new (C) Stmt*[nexpr]; 2120 for (unsigned i = 0; i < nexpr; i++) 2121 SubExprs[i] = args[i]; 2122 } 2123 2124 /// \brief Build an empty vector-shuffle expression. 2125 explicit ShuffleVectorExpr(EmptyShell Empty) 2126 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2127 2128 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2129 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2130 2131 SourceLocation getRParenLoc() const { return RParenLoc; } 2132 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2133 2134 virtual SourceRange getSourceRange() const { 2135 return SourceRange(BuiltinLoc, RParenLoc); 2136 } 2137 static bool classof(const Stmt *T) { 2138 return T->getStmtClass() == ShuffleVectorExprClass; 2139 } 2140 static bool classof(const ShuffleVectorExpr *) { return true; } 2141 2142 ~ShuffleVectorExpr() {} 2143 2144 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2145 /// constant expression, the actual arguments passed in, and the function 2146 /// pointers. 2147 unsigned getNumSubExprs() const { return NumExprs; } 2148 2149 /// getExpr - Return the Expr at the specified index. 2150 Expr *getExpr(unsigned Index) { 2151 assert((Index < NumExprs) && "Arg access out of range!"); 2152 return cast<Expr>(SubExprs[Index]); 2153 } 2154 const Expr *getExpr(unsigned Index) const { 2155 assert((Index < NumExprs) && "Arg access out of range!"); 2156 return cast<Expr>(SubExprs[Index]); 2157 } 2158 2159 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2160 2161 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2162 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2163 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2164 } 2165 2166 // Iterators 2167 virtual child_iterator child_begin(); 2168 virtual child_iterator child_end(); 2169}; 2170 2171/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2172/// This AST node is similar to the conditional operator (?:) in C, with 2173/// the following exceptions: 2174/// - the test expression must be a integer constant expression. 2175/// - the expression returned acts like the chosen subexpression in every 2176/// visible way: the type is the same as that of the chosen subexpression, 2177/// and all predicates (whether it's an l-value, whether it's an integer 2178/// constant expression, etc.) return the same result as for the chosen 2179/// sub-expression. 2180class ChooseExpr : public Expr { 2181 enum { COND, LHS, RHS, END_EXPR }; 2182 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2183 SourceLocation BuiltinLoc, RParenLoc; 2184public: 2185 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2186 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2187 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2188 BuiltinLoc(BLoc), RParenLoc(RP) { 2189 SubExprs[COND] = cond; 2190 SubExprs[LHS] = lhs; 2191 SubExprs[RHS] = rhs; 2192 } 2193 2194 /// \brief Build an empty __builtin_choose_expr. 2195 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2196 2197 /// isConditionTrue - Return whether the condition is true (i.e. not 2198 /// equal to zero). 2199 bool isConditionTrue(ASTContext &C) const; 2200 2201 /// getChosenSubExpr - Return the subexpression chosen according to the 2202 /// condition. 2203 Expr *getChosenSubExpr(ASTContext &C) const { 2204 return isConditionTrue(C) ? getLHS() : getRHS(); 2205 } 2206 2207 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2208 void setCond(Expr *E) { SubExprs[COND] = E; } 2209 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2210 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2211 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2212 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2213 2214 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2215 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2216 2217 SourceLocation getRParenLoc() const { return RParenLoc; } 2218 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2219 2220 virtual SourceRange getSourceRange() const { 2221 return SourceRange(BuiltinLoc, RParenLoc); 2222 } 2223 static bool classof(const Stmt *T) { 2224 return T->getStmtClass() == ChooseExprClass; 2225 } 2226 static bool classof(const ChooseExpr *) { return true; } 2227 2228 // Iterators 2229 virtual child_iterator child_begin(); 2230 virtual child_iterator child_end(); 2231}; 2232 2233/// GNUNullExpr - Implements the GNU __null extension, which is a name 2234/// for a null pointer constant that has integral type (e.g., int or 2235/// long) and is the same size and alignment as a pointer. The __null 2236/// extension is typically only used by system headers, which define 2237/// NULL as __null in C++ rather than using 0 (which is an integer 2238/// that may not match the size of a pointer). 2239class GNUNullExpr : public Expr { 2240 /// TokenLoc - The location of the __null keyword. 2241 SourceLocation TokenLoc; 2242 2243public: 2244 GNUNullExpr(QualType Ty, SourceLocation Loc) 2245 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 2246 2247 /// \brief Build an empty GNU __null expression. 2248 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2249 2250 /// getTokenLocation - The location of the __null token. 2251 SourceLocation getTokenLocation() const { return TokenLoc; } 2252 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2253 2254 virtual SourceRange getSourceRange() const { 2255 return SourceRange(TokenLoc); 2256 } 2257 static bool classof(const Stmt *T) { 2258 return T->getStmtClass() == GNUNullExprClass; 2259 } 2260 static bool classof(const GNUNullExpr *) { return true; } 2261 2262 // Iterators 2263 virtual child_iterator child_begin(); 2264 virtual child_iterator child_end(); 2265}; 2266 2267/// VAArgExpr, used for the builtin function __builtin_va_start. 2268class VAArgExpr : public Expr { 2269 Stmt *Val; 2270 SourceLocation BuiltinLoc, RParenLoc; 2271public: 2272 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2273 : Expr(VAArgExprClass, t), 2274 Val(e), 2275 BuiltinLoc(BLoc), 2276 RParenLoc(RPLoc) { } 2277 2278 /// \brief Create an empty __builtin_va_start expression. 2279 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2280 2281 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2282 Expr *getSubExpr() { return cast<Expr>(Val); } 2283 void setSubExpr(Expr *E) { Val = E; } 2284 2285 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2286 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2287 2288 SourceLocation getRParenLoc() const { return RParenLoc; } 2289 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2290 2291 virtual SourceRange getSourceRange() const { 2292 return SourceRange(BuiltinLoc, RParenLoc); 2293 } 2294 static bool classof(const Stmt *T) { 2295 return T->getStmtClass() == VAArgExprClass; 2296 } 2297 static bool classof(const VAArgExpr *) { return true; } 2298 2299 // Iterators 2300 virtual child_iterator child_begin(); 2301 virtual child_iterator child_end(); 2302}; 2303 2304/// @brief Describes an C or C++ initializer list. 2305/// 2306/// InitListExpr describes an initializer list, which can be used to 2307/// initialize objects of different types, including 2308/// struct/class/union types, arrays, and vectors. For example: 2309/// 2310/// @code 2311/// struct foo x = { 1, { 2, 3 } }; 2312/// @endcode 2313/// 2314/// Prior to semantic analysis, an initializer list will represent the 2315/// initializer list as written by the user, but will have the 2316/// placeholder type "void". This initializer list is called the 2317/// syntactic form of the initializer, and may contain C99 designated 2318/// initializers (represented as DesignatedInitExprs), initializations 2319/// of subobject members without explicit braces, and so on. Clients 2320/// interested in the original syntax of the initializer list should 2321/// use the syntactic form of the initializer list. 2322/// 2323/// After semantic analysis, the initializer list will represent the 2324/// semantic form of the initializer, where the initializations of all 2325/// subobjects are made explicit with nested InitListExpr nodes and 2326/// C99 designators have been eliminated by placing the designated 2327/// initializations into the subobject they initialize. Additionally, 2328/// any "holes" in the initialization, where no initializer has been 2329/// specified for a particular subobject, will be replaced with 2330/// implicitly-generated ImplicitValueInitExpr expressions that 2331/// value-initialize the subobjects. Note, however, that the 2332/// initializer lists may still have fewer initializers than there are 2333/// elements to initialize within the object. 2334/// 2335/// Given the semantic form of the initializer list, one can retrieve 2336/// the original syntactic form of that initializer list (if it 2337/// exists) using getSyntacticForm(). Since many initializer lists 2338/// have the same syntactic and semantic forms, getSyntacticForm() may 2339/// return NULL, indicating that the current initializer list also 2340/// serves as its syntactic form. 2341class InitListExpr : public Expr { 2342 // FIXME: Eliminate this vector in favor of ASTContext allocation 2343 std::vector<Stmt *> InitExprs; 2344 SourceLocation LBraceLoc, RBraceLoc; 2345 2346 /// Contains the initializer list that describes the syntactic form 2347 /// written in the source code. 2348 InitListExpr *SyntacticForm; 2349 2350 /// If this initializer list initializes a union, specifies which 2351 /// field within the union will be initialized. 2352 FieldDecl *UnionFieldInit; 2353 2354 /// Whether this initializer list originally had a GNU array-range 2355 /// designator in it. This is a temporary marker used by CodeGen. 2356 bool HadArrayRangeDesignator; 2357 2358public: 2359 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2360 SourceLocation rbraceloc); 2361 2362 /// \brief Build an empty initializer list. 2363 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2364 2365 unsigned getNumInits() const { return InitExprs.size(); } 2366 2367 const Expr* getInit(unsigned Init) const { 2368 assert(Init < getNumInits() && "Initializer access out of range!"); 2369 return cast_or_null<Expr>(InitExprs[Init]); 2370 } 2371 2372 Expr* getInit(unsigned Init) { 2373 assert(Init < getNumInits() && "Initializer access out of range!"); 2374 return cast_or_null<Expr>(InitExprs[Init]); 2375 } 2376 2377 void setInit(unsigned Init, Expr *expr) { 2378 assert(Init < getNumInits() && "Initializer access out of range!"); 2379 InitExprs[Init] = expr; 2380 } 2381 2382 /// \brief Reserve space for some number of initializers. 2383 void reserveInits(unsigned NumInits); 2384 2385 /// @brief Specify the number of initializers 2386 /// 2387 /// If there are more than @p NumInits initializers, the remaining 2388 /// initializers will be destroyed. If there are fewer than @p 2389 /// NumInits initializers, NULL expressions will be added for the 2390 /// unknown initializers. 2391 void resizeInits(ASTContext &Context, unsigned NumInits); 2392 2393 /// @brief Updates the initializer at index @p Init with the new 2394 /// expression @p expr, and returns the old expression at that 2395 /// location. 2396 /// 2397 /// When @p Init is out of range for this initializer list, the 2398 /// initializer list will be extended with NULL expressions to 2399 /// accomodate the new entry. 2400 Expr *updateInit(unsigned Init, Expr *expr); 2401 2402 /// \brief If this initializes a union, specifies which field in the 2403 /// union to initialize. 2404 /// 2405 /// Typically, this field is the first named field within the 2406 /// union. However, a designated initializer can specify the 2407 /// initialization of a different field within the union. 2408 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2409 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2410 2411 // Explicit InitListExpr's originate from source code (and have valid source 2412 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2413 bool isExplicit() { 2414 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2415 } 2416 2417 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2418 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2419 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2420 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2421 2422 /// @brief Retrieve the initializer list that describes the 2423 /// syntactic form of the initializer. 2424 /// 2425 /// 2426 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2427 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2428 2429 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2430 void sawArrayRangeDesignator(bool ARD = true) { 2431 HadArrayRangeDesignator = ARD; 2432 } 2433 2434 virtual SourceRange getSourceRange() const { 2435 return SourceRange(LBraceLoc, RBraceLoc); 2436 } 2437 static bool classof(const Stmt *T) { 2438 return T->getStmtClass() == InitListExprClass; 2439 } 2440 static bool classof(const InitListExpr *) { return true; } 2441 2442 // Iterators 2443 virtual child_iterator child_begin(); 2444 virtual child_iterator child_end(); 2445 2446 typedef std::vector<Stmt *>::iterator iterator; 2447 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2448 2449 iterator begin() { return InitExprs.begin(); } 2450 iterator end() { return InitExprs.end(); } 2451 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2452 reverse_iterator rend() { return InitExprs.rend(); } 2453}; 2454 2455/// @brief Represents a C99 designated initializer expression. 2456/// 2457/// A designated initializer expression (C99 6.7.8) contains one or 2458/// more designators (which can be field designators, array 2459/// designators, or GNU array-range designators) followed by an 2460/// expression that initializes the field or element(s) that the 2461/// designators refer to. For example, given: 2462/// 2463/// @code 2464/// struct point { 2465/// double x; 2466/// double y; 2467/// }; 2468/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2469/// @endcode 2470/// 2471/// The InitListExpr contains three DesignatedInitExprs, the first of 2472/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2473/// designators, one array designator for @c [2] followed by one field 2474/// designator for @c .y. The initalization expression will be 1.0. 2475class DesignatedInitExpr : public Expr { 2476public: 2477 /// \brief Forward declaration of the Designator class. 2478 class Designator; 2479 2480private: 2481 /// The location of the '=' or ':' prior to the actual initializer 2482 /// expression. 2483 SourceLocation EqualOrColonLoc; 2484 2485 /// Whether this designated initializer used the GNU deprecated 2486 /// syntax rather than the C99 '=' syntax. 2487 bool GNUSyntax : 1; 2488 2489 /// The number of designators in this initializer expression. 2490 unsigned NumDesignators : 15; 2491 2492 /// \brief The designators in this designated initialization 2493 /// expression. 2494 Designator *Designators; 2495 2496 /// The number of subexpressions of this initializer expression, 2497 /// which contains both the initializer and any additional 2498 /// expressions used by array and array-range designators. 2499 unsigned NumSubExprs : 16; 2500 2501 2502 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2503 const Designator *Designators, 2504 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2505 Expr **IndexExprs, unsigned NumIndexExprs, 2506 Expr *Init); 2507 2508 explicit DesignatedInitExpr(unsigned NumSubExprs) 2509 : Expr(DesignatedInitExprClass, EmptyShell()), 2510 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2511 2512protected: 2513 virtual void DoDestroy(ASTContext &C); 2514 2515public: 2516 /// A field designator, e.g., ".x". 2517 struct FieldDesignator { 2518 /// Refers to the field that is being initialized. The low bit 2519 /// of this field determines whether this is actually a pointer 2520 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2521 /// initially constructed, a field designator will store an 2522 /// IdentifierInfo*. After semantic analysis has resolved that 2523 /// name, the field designator will instead store a FieldDecl*. 2524 uintptr_t NameOrField; 2525 2526 /// The location of the '.' in the designated initializer. 2527 unsigned DotLoc; 2528 2529 /// The location of the field name in the designated initializer. 2530 unsigned FieldLoc; 2531 }; 2532 2533 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2534 struct ArrayOrRangeDesignator { 2535 /// Location of the first index expression within the designated 2536 /// initializer expression's list of subexpressions. 2537 unsigned Index; 2538 /// The location of the '[' starting the array range designator. 2539 unsigned LBracketLoc; 2540 /// The location of the ellipsis separating the start and end 2541 /// indices. Only valid for GNU array-range designators. 2542 unsigned EllipsisLoc; 2543 /// The location of the ']' terminating the array range designator. 2544 unsigned RBracketLoc; 2545 }; 2546 2547 /// @brief Represents a single C99 designator. 2548 /// 2549 /// @todo This class is infuriatingly similar to clang::Designator, 2550 /// but minor differences (storing indices vs. storing pointers) 2551 /// keep us from reusing it. Try harder, later, to rectify these 2552 /// differences. 2553 class Designator { 2554 /// @brief The kind of designator this describes. 2555 enum { 2556 FieldDesignator, 2557 ArrayDesignator, 2558 ArrayRangeDesignator 2559 } Kind; 2560 2561 union { 2562 /// A field designator, e.g., ".x". 2563 struct FieldDesignator Field; 2564 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2565 struct ArrayOrRangeDesignator ArrayOrRange; 2566 }; 2567 friend class DesignatedInitExpr; 2568 2569 public: 2570 Designator() {} 2571 2572 /// @brief Initializes a field designator. 2573 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2574 SourceLocation FieldLoc) 2575 : Kind(FieldDesignator) { 2576 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2577 Field.DotLoc = DotLoc.getRawEncoding(); 2578 Field.FieldLoc = FieldLoc.getRawEncoding(); 2579 } 2580 2581 /// @brief Initializes an array designator. 2582 Designator(unsigned Index, SourceLocation LBracketLoc, 2583 SourceLocation RBracketLoc) 2584 : Kind(ArrayDesignator) { 2585 ArrayOrRange.Index = Index; 2586 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2587 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2588 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2589 } 2590 2591 /// @brief Initializes a GNU array-range designator. 2592 Designator(unsigned Index, SourceLocation LBracketLoc, 2593 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2594 : Kind(ArrayRangeDesignator) { 2595 ArrayOrRange.Index = Index; 2596 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2597 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2598 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2599 } 2600 2601 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2602 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2603 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2604 2605 IdentifierInfo * getFieldName(); 2606 2607 FieldDecl *getField() { 2608 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2609 if (Field.NameOrField & 0x01) 2610 return 0; 2611 else 2612 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2613 } 2614 2615 void setField(FieldDecl *FD) { 2616 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2617 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2618 } 2619 2620 SourceLocation getDotLoc() const { 2621 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2622 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2623 } 2624 2625 SourceLocation getFieldLoc() const { 2626 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2627 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2628 } 2629 2630 SourceLocation getLBracketLoc() const { 2631 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2632 "Only valid on an array or array-range designator"); 2633 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2634 } 2635 2636 SourceLocation getRBracketLoc() const { 2637 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2638 "Only valid on an array or array-range designator"); 2639 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2640 } 2641 2642 SourceLocation getEllipsisLoc() const { 2643 assert(Kind == ArrayRangeDesignator && 2644 "Only valid on an array-range designator"); 2645 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2646 } 2647 2648 unsigned getFirstExprIndex() const { 2649 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2650 "Only valid on an array or array-range designator"); 2651 return ArrayOrRange.Index; 2652 } 2653 2654 SourceLocation getStartLocation() const { 2655 if (Kind == FieldDesignator) 2656 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2657 else 2658 return getLBracketLoc(); 2659 } 2660 }; 2661 2662 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2663 unsigned NumDesignators, 2664 Expr **IndexExprs, unsigned NumIndexExprs, 2665 SourceLocation EqualOrColonLoc, 2666 bool GNUSyntax, Expr *Init); 2667 2668 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2669 2670 /// @brief Returns the number of designators in this initializer. 2671 unsigned size() const { return NumDesignators; } 2672 2673 // Iterator access to the designators. 2674 typedef Designator* designators_iterator; 2675 designators_iterator designators_begin() { return Designators; } 2676 designators_iterator designators_end() { 2677 return Designators + NumDesignators; 2678 } 2679 2680 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2681 2682 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2683 2684 Expr *getArrayIndex(const Designator& D); 2685 Expr *getArrayRangeStart(const Designator& D); 2686 Expr *getArrayRangeEnd(const Designator& D); 2687 2688 /// @brief Retrieve the location of the '=' that precedes the 2689 /// initializer value itself, if present. 2690 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2691 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2692 2693 /// @brief Determines whether this designated initializer used the 2694 /// deprecated GNU syntax for designated initializers. 2695 bool usesGNUSyntax() const { return GNUSyntax; } 2696 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2697 2698 /// @brief Retrieve the initializer value. 2699 Expr *getInit() const { 2700 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2701 } 2702 2703 void setInit(Expr *init) { 2704 *child_begin() = init; 2705 } 2706 2707 /// \brief Retrieve the total number of subexpressions in this 2708 /// designated initializer expression, including the actual 2709 /// initialized value and any expressions that occur within array 2710 /// and array-range designators. 2711 unsigned getNumSubExprs() const { return NumSubExprs; } 2712 2713 Expr *getSubExpr(unsigned Idx) { 2714 assert(Idx < NumSubExprs && "Subscript out of range"); 2715 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2716 Ptr += sizeof(DesignatedInitExpr); 2717 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2718 } 2719 2720 void setSubExpr(unsigned Idx, Expr *E) { 2721 assert(Idx < NumSubExprs && "Subscript out of range"); 2722 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2723 Ptr += sizeof(DesignatedInitExpr); 2724 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2725 } 2726 2727 /// \brief Replaces the designator at index @p Idx with the series 2728 /// of designators in [First, Last). 2729 void ExpandDesignator(unsigned Idx, const Designator *First, 2730 const Designator *Last); 2731 2732 virtual SourceRange getSourceRange() const; 2733 2734 static bool classof(const Stmt *T) { 2735 return T->getStmtClass() == DesignatedInitExprClass; 2736 } 2737 static bool classof(const DesignatedInitExpr *) { return true; } 2738 2739 // Iterators 2740 virtual child_iterator child_begin(); 2741 virtual child_iterator child_end(); 2742}; 2743 2744/// \brief Represents an implicitly-generated value initialization of 2745/// an object of a given type. 2746/// 2747/// Implicit value initializations occur within semantic initializer 2748/// list expressions (InitListExpr) as placeholders for subobject 2749/// initializations not explicitly specified by the user. 2750/// 2751/// \see InitListExpr 2752class ImplicitValueInitExpr : public Expr { 2753public: 2754 explicit ImplicitValueInitExpr(QualType ty) 2755 : Expr(ImplicitValueInitExprClass, ty) { } 2756 2757 /// \brief Construct an empty implicit value initialization. 2758 explicit ImplicitValueInitExpr(EmptyShell Empty) 2759 : Expr(ImplicitValueInitExprClass, Empty) { } 2760 2761 static bool classof(const Stmt *T) { 2762 return T->getStmtClass() == ImplicitValueInitExprClass; 2763 } 2764 static bool classof(const ImplicitValueInitExpr *) { return true; } 2765 2766 virtual SourceRange getSourceRange() const { 2767 return SourceRange(); 2768 } 2769 2770 // Iterators 2771 virtual child_iterator child_begin(); 2772 virtual child_iterator child_end(); 2773}; 2774 2775 2776class ParenListExpr : public Expr { 2777 Stmt **Exprs; 2778 unsigned NumExprs; 2779 SourceLocation LParenLoc, RParenLoc; 2780 2781protected: 2782 virtual void DoDestroy(ASTContext& C); 2783 2784public: 2785 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2786 unsigned numexprs, SourceLocation rparenloc); 2787 2788 ~ParenListExpr() {} 2789 2790 /// \brief Build an empty paren list. 2791 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2792 2793 unsigned getNumExprs() const { return NumExprs; } 2794 2795 const Expr* getExpr(unsigned Init) const { 2796 assert(Init < getNumExprs() && "Initializer access out of range!"); 2797 return cast_or_null<Expr>(Exprs[Init]); 2798 } 2799 2800 Expr* getExpr(unsigned Init) { 2801 assert(Init < getNumExprs() && "Initializer access out of range!"); 2802 return cast_or_null<Expr>(Exprs[Init]); 2803 } 2804 2805 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2806 2807 SourceLocation getLParenLoc() const { return LParenLoc; } 2808 SourceLocation getRParenLoc() const { return RParenLoc; } 2809 2810 virtual SourceRange getSourceRange() const { 2811 return SourceRange(LParenLoc, RParenLoc); 2812 } 2813 static bool classof(const Stmt *T) { 2814 return T->getStmtClass() == ParenListExprClass; 2815 } 2816 static bool classof(const ParenListExpr *) { return true; } 2817 2818 // Iterators 2819 virtual child_iterator child_begin(); 2820 virtual child_iterator child_end(); 2821}; 2822 2823 2824//===----------------------------------------------------------------------===// 2825// Clang Extensions 2826//===----------------------------------------------------------------------===// 2827 2828 2829/// ExtVectorElementExpr - This represents access to specific elements of a 2830/// vector, and may occur on the left hand side or right hand side. For example 2831/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2832/// 2833/// Note that the base may have either vector or pointer to vector type, just 2834/// like a struct field reference. 2835/// 2836class ExtVectorElementExpr : public Expr { 2837 Stmt *Base; 2838 IdentifierInfo *Accessor; 2839 SourceLocation AccessorLoc; 2840public: 2841 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2842 SourceLocation loc) 2843 : Expr(ExtVectorElementExprClass, ty), 2844 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2845 2846 /// \brief Build an empty vector element expression. 2847 explicit ExtVectorElementExpr(EmptyShell Empty) 2848 : Expr(ExtVectorElementExprClass, Empty) { } 2849 2850 const Expr *getBase() const { return cast<Expr>(Base); } 2851 Expr *getBase() { return cast<Expr>(Base); } 2852 void setBase(Expr *E) { Base = E; } 2853 2854 IdentifierInfo &getAccessor() const { return *Accessor; } 2855 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2856 2857 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2858 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2859 2860 /// getNumElements - Get the number of components being selected. 2861 unsigned getNumElements() const; 2862 2863 /// containsDuplicateElements - Return true if any element access is 2864 /// repeated. 2865 bool containsDuplicateElements() const; 2866 2867 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2868 /// aggregate Constant of ConstantInt(s). 2869 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2870 2871 virtual SourceRange getSourceRange() const { 2872 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2873 } 2874 2875 /// isArrow - Return true if the base expression is a pointer to vector, 2876 /// return false if the base expression is a vector. 2877 bool isArrow() const; 2878 2879 static bool classof(const Stmt *T) { 2880 return T->getStmtClass() == ExtVectorElementExprClass; 2881 } 2882 static bool classof(const ExtVectorElementExpr *) { return true; } 2883 2884 // Iterators 2885 virtual child_iterator child_begin(); 2886 virtual child_iterator child_end(); 2887}; 2888 2889 2890/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2891/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2892class BlockExpr : public Expr { 2893protected: 2894 BlockDecl *TheBlock; 2895 bool HasBlockDeclRefExprs; 2896public: 2897 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2898 : Expr(BlockExprClass, ty), 2899 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2900 2901 /// \brief Build an empty block expression. 2902 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2903 2904 const BlockDecl *getBlockDecl() const { return TheBlock; } 2905 BlockDecl *getBlockDecl() { return TheBlock; } 2906 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2907 2908 // Convenience functions for probing the underlying BlockDecl. 2909 SourceLocation getCaretLocation() const; 2910 const Stmt *getBody() const; 2911 Stmt *getBody(); 2912 2913 virtual SourceRange getSourceRange() const { 2914 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2915 } 2916 2917 /// getFunctionType - Return the underlying function type for this block. 2918 const FunctionType *getFunctionType() const; 2919 2920 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2921 /// inside of the block that reference values outside the block. 2922 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2923 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2924 2925 static bool classof(const Stmt *T) { 2926 return T->getStmtClass() == BlockExprClass; 2927 } 2928 static bool classof(const BlockExpr *) { return true; } 2929 2930 // Iterators 2931 virtual child_iterator child_begin(); 2932 virtual child_iterator child_end(); 2933}; 2934 2935/// BlockDeclRefExpr - A reference to a declared variable, function, 2936/// enum, etc. 2937class BlockDeclRefExpr : public Expr { 2938 ValueDecl *D; 2939 SourceLocation Loc; 2940 bool IsByRef : 1; 2941 bool ConstQualAdded : 1; 2942public: 2943 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2944 bool constAdded = false) : 2945 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2946 ConstQualAdded(constAdded) {} 2947 2948 // \brief Build an empty reference to a declared variable in a 2949 // block. 2950 explicit BlockDeclRefExpr(EmptyShell Empty) 2951 : Expr(BlockDeclRefExprClass, Empty) { } 2952 2953 ValueDecl *getDecl() { return D; } 2954 const ValueDecl *getDecl() const { return D; } 2955 void setDecl(ValueDecl *VD) { D = VD; } 2956 2957 SourceLocation getLocation() const { return Loc; } 2958 void setLocation(SourceLocation L) { Loc = L; } 2959 2960 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2961 2962 bool isByRef() const { return IsByRef; } 2963 void setByRef(bool BR) { IsByRef = BR; } 2964 2965 bool isConstQualAdded() const { return ConstQualAdded; } 2966 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2967 2968 static bool classof(const Stmt *T) { 2969 return T->getStmtClass() == BlockDeclRefExprClass; 2970 } 2971 static bool classof(const BlockDeclRefExpr *) { return true; } 2972 2973 // Iterators 2974 virtual child_iterator child_begin(); 2975 virtual child_iterator child_end(); 2976}; 2977 2978} // end namespace clang 2979 2980#endif 2981