Expr.h revision bc0e0781da778bd5eb41a810419912893ae20448
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include "llvm/ADT/StringRef.h" 24#include <vector> 25 26namespace clang { 27 class ASTContext; 28 class APValue; 29 class Decl; 30 class IdentifierInfo; 31 class ParmVarDecl; 32 class NamedDecl; 33 class ValueDecl; 34 class BlockDecl; 35 class CXXOperatorCallExpr; 36 class CXXMemberCallExpr; 37 class TemplateArgumentLoc; 38 class TemplateArgumentListInfo; 39 40/// Expr - This represents one expression. Note that Expr's are subclasses of 41/// Stmt. This allows an expression to be transparently used any place a Stmt 42/// is required. 43/// 44class Expr : public Stmt { 45 QualType TR; 46 47protected: 48 /// TypeDependent - Whether this expression is type-dependent 49 /// (C++ [temp.dep.expr]). 50 bool TypeDependent : 1; 51 52 /// ValueDependent - Whether this expression is value-dependent 53 /// (C++ [temp.dep.constexpr]). 54 bool ValueDependent : 1; 55 56 // FIXME: Eventually, this constructor should go away and we should 57 // require every subclass to provide type/value-dependence 58 // information. 59 Expr(StmtClass SC, QualType T) 60 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 61 setType(T); 62 } 63 64 Expr(StmtClass SC, QualType T, bool TD, bool VD) 65 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 66 setType(T); 67 } 68 69 /// \brief Construct an empty expression. 70 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 71 72public: 73 /// \brief Increases the reference count for this expression. 74 /// 75 /// Invoke the Retain() operation when this expression 76 /// is being shared by another owner. 77 Expr *Retain() { 78 Stmt::Retain(); 79 return this; 80 } 81 82 QualType getType() const { return TR; } 83 void setType(QualType t) { 84 // In C++, the type of an expression is always adjusted so that it 85 // will not have reference type an expression will never have 86 // reference type (C++ [expr]p6). Use 87 // QualType::getNonReferenceType() to retrieve the non-reference 88 // type. Additionally, inspect Expr::isLvalue to determine whether 89 // an expression that is adjusted in this manner should be 90 // considered an lvalue. 91 assert((t.isNull() || !t->isReferenceType()) && 92 "Expressions can't have reference type"); 93 94 TR = t; 95 } 96 97 /// isValueDependent - Determines whether this expression is 98 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 99 /// array bound of "Chars" in the following example is 100 /// value-dependent. 101 /// @code 102 /// template<int Size, char (&Chars)[Size]> struct meta_string; 103 /// @endcode 104 bool isValueDependent() const { return ValueDependent; } 105 106 /// \brief Set whether this expression is value-dependent or not. 107 void setValueDependent(bool VD) { ValueDependent = VD; } 108 109 /// isTypeDependent - Determines whether this expression is 110 /// type-dependent (C++ [temp.dep.expr]), which means that its type 111 /// could change from one template instantiation to the next. For 112 /// example, the expressions "x" and "x + y" are type-dependent in 113 /// the following code, but "y" is not type-dependent: 114 /// @code 115 /// template<typename T> 116 /// void add(T x, int y) { 117 /// x + y; 118 /// } 119 /// @endcode 120 bool isTypeDependent() const { return TypeDependent; } 121 122 /// \brief Set whether this expression is type-dependent or not. 123 void setTypeDependent(bool TD) { TypeDependent = TD; } 124 125 /// SourceLocation tokens are not useful in isolation - they are low level 126 /// value objects created/interpreted by SourceManager. We assume AST 127 /// clients will have a pointer to the respective SourceManager. 128 virtual SourceRange getSourceRange() const = 0; 129 130 /// getExprLoc - Return the preferred location for the arrow when diagnosing 131 /// a problem with a generic expression. 132 virtual SourceLocation getExprLoc() const { return getLocStart(); } 133 134 /// isUnusedResultAWarning - Return true if this immediate expression should 135 /// be warned about if the result is unused. If so, fill in Loc and Ranges 136 /// with location to warn on and the source range[s] to report with the 137 /// warning. 138 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 139 SourceRange &R2, ASTContext &Ctx) const; 140 141 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 142 /// incomplete type other than void. Nonarray expressions that can be lvalues: 143 /// - name, where name must be a variable 144 /// - e[i] 145 /// - (e), where e must be an lvalue 146 /// - e.name, where e must be an lvalue 147 /// - e->name 148 /// - *e, the type of e cannot be a function type 149 /// - string-constant 150 /// - reference type [C++ [expr]] 151 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 152 /// 153 enum isLvalueResult { 154 LV_Valid, 155 LV_NotObjectType, 156 LV_IncompleteVoidType, 157 LV_DuplicateVectorComponents, 158 LV_InvalidExpression, 159 LV_MemberFunction 160 }; 161 isLvalueResult isLvalue(ASTContext &Ctx) const; 162 163 // Same as above, but excluding checks for non-object and void types in C 164 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 165 166 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 167 /// does not have an incomplete type, does not have a const-qualified type, 168 /// and if it is a structure or union, does not have any member (including, 169 /// recursively, any member or element of all contained aggregates or unions) 170 /// with a const-qualified type. 171 /// 172 /// \param Loc [in] [out] - A source location which *may* be filled 173 /// in with the location of the expression making this a 174 /// non-modifiable lvalue, if specified. 175 enum isModifiableLvalueResult { 176 MLV_Valid, 177 MLV_NotObjectType, 178 MLV_IncompleteVoidType, 179 MLV_DuplicateVectorComponents, 180 MLV_InvalidExpression, 181 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 182 MLV_IncompleteType, 183 MLV_ConstQualified, 184 MLV_ArrayType, 185 MLV_NotBlockQualified, 186 MLV_ReadonlyProperty, 187 MLV_NoSetterProperty, 188 MLV_MemberFunction 189 }; 190 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 191 SourceLocation *Loc = 0) const; 192 193 /// \brief If this expression refers to a bit-field, retrieve the 194 /// declaration of that bit-field. 195 FieldDecl *getBitField(); 196 197 const FieldDecl *getBitField() const { 198 return const_cast<Expr*>(this)->getBitField(); 199 } 200 201 /// isIntegerConstantExpr - Return true if this expression is a valid integer 202 /// constant expression, and, if so, return its value in Result. If not a 203 /// valid i-c-e, return false and fill in Loc (if specified) with the location 204 /// of the invalid expression. 205 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 206 SourceLocation *Loc = 0, 207 bool isEvaluated = true) const; 208 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 209 llvm::APSInt X; 210 return isIntegerConstantExpr(X, Ctx, Loc); 211 } 212 /// isConstantInitializer - Returns true if this expression is a constant 213 /// initializer, which can be emitted at compile-time. 214 bool isConstantInitializer(ASTContext &Ctx) const; 215 216 /// EvalResult is a struct with detailed info about an evaluated expression. 217 struct EvalResult { 218 /// Val - This is the value the expression can be folded to. 219 APValue Val; 220 221 /// HasSideEffects - Whether the evaluated expression has side effects. 222 /// For example, (f() && 0) can be folded, but it still has side effects. 223 bool HasSideEffects; 224 225 /// Diag - If the expression is unfoldable, then Diag contains a note 226 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 227 /// position for the error, and DiagExpr is the expression that caused 228 /// the error. 229 /// If the expression is foldable, but not an integer constant expression, 230 /// Diag contains a note diagnostic that describes why it isn't an integer 231 /// constant expression. If the expression *is* an integer constant 232 /// expression, then Diag will be zero. 233 unsigned Diag; 234 const Expr *DiagExpr; 235 SourceLocation DiagLoc; 236 237 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 238 }; 239 240 /// Evaluate - Return true if this is a constant which we can fold using 241 /// any crazy technique (that has nothing to do with language standards) that 242 /// we want to. If this function returns true, it returns the folded constant 243 /// in Result. 244 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 245 246 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 247 /// stack based objects. 248 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 249 250 /// isEvaluatable - Call Evaluate to see if this expression can be constant 251 /// folded, but discard the result. 252 bool isEvaluatable(ASTContext &Ctx) const; 253 254 /// HasSideEffects - This routine returns true for all those expressions 255 /// which must be evaluated each time and must not be optimization away 256 /// or evaluated at compile time. Example is a function call, volatile 257 /// variable read. 258 bool HasSideEffects(ASTContext &Ctx) const; 259 260 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 261 /// must be called on an expression that constant folds to an integer. 262 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 263 264 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 265 /// with link time known address. 266 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 267 268 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 269 /// also succeeds on stack based, immutable address lvalues. 270 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 271 272 /// \brief Enumeration used to describe how \c isNullPointerConstant() 273 /// should cope with value-dependent expressions. 274 enum NullPointerConstantValueDependence { 275 /// \brief Specifies that the expression should never be value-dependent. 276 NPC_NeverValueDependent = 0, 277 278 /// \brief Specifies that a value-dependent expression of integral or 279 /// dependent type should be considered a null pointer constant. 280 NPC_ValueDependentIsNull, 281 282 /// \brief Specifies that a value-dependent expression should be considered 283 /// to never be a null pointer constant. 284 NPC_ValueDependentIsNotNull 285 }; 286 287 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 288 /// integer constant expression with the value zero, or if this is one that is 289 /// cast to void*. 290 bool isNullPointerConstant(ASTContext &Ctx, 291 NullPointerConstantValueDependence NPC) const; 292 293 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 294 /// write barrier. 295 bool isOBJCGCCandidate(ASTContext &Ctx) const; 296 297 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 298 /// its subexpression. If that subexpression is also a ParenExpr, 299 /// then this method recursively returns its subexpression, and so forth. 300 /// Otherwise, the method returns the current Expr. 301 Expr* IgnoreParens(); 302 303 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 304 /// or CastExprs, returning their operand. 305 Expr *IgnoreParenCasts(); 306 307 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 308 /// value (including ptr->int casts of the same size). Strip off any 309 /// ParenExpr or CastExprs, returning their operand. 310 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 311 312 const Expr* IgnoreParens() const { 313 return const_cast<Expr*>(this)->IgnoreParens(); 314 } 315 const Expr *IgnoreParenCasts() const { 316 return const_cast<Expr*>(this)->IgnoreParenCasts(); 317 } 318 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 319 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 320 } 321 322 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 323 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 324 325 static bool classof(const Stmt *T) { 326 return T->getStmtClass() >= firstExprConstant && 327 T->getStmtClass() <= lastExprConstant; 328 } 329 static bool classof(const Expr *) { return true; } 330}; 331 332 333//===----------------------------------------------------------------------===// 334// Primary Expressions. 335//===----------------------------------------------------------------------===// 336 337/// \brief Represents the qualifier that may precede a C++ name, e.g., the 338/// "std::" in "std::sort". 339struct NameQualifier { 340 /// \brief The nested name specifier. 341 NestedNameSpecifier *NNS; 342 343 /// \brief The source range covered by the nested name specifier. 344 SourceRange Range; 345}; 346 347/// \brief Represents an explicit template argument list in C++, e.g., 348/// the "<int>" in "sort<int>". 349struct ExplicitTemplateArgumentList { 350 /// \brief The source location of the left angle bracket ('<'); 351 SourceLocation LAngleLoc; 352 353 /// \brief The source location of the right angle bracket ('>'); 354 SourceLocation RAngleLoc; 355 356 /// \brief The number of template arguments in TemplateArgs. 357 /// The actual template arguments (if any) are stored after the 358 /// ExplicitTemplateArgumentList structure. 359 unsigned NumTemplateArgs; 360 361 /// \brief Retrieve the template arguments 362 TemplateArgumentLoc *getTemplateArgs() { 363 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 364 } 365 366 /// \brief Retrieve the template arguments 367 const TemplateArgumentLoc *getTemplateArgs() const { 368 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 369 } 370 371 void initializeFrom(const TemplateArgumentListInfo &List); 372 void copyInto(TemplateArgumentListInfo &List) const; 373 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 374}; 375 376/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 377/// enum, etc. 378class DeclRefExpr : public Expr { 379 enum { 380 // Flag on DecoratedD that specifies when this declaration reference 381 // expression has a C++ nested-name-specifier. 382 HasQualifierFlag = 0x01, 383 // Flag on DecoratedD that specifies when this declaration reference 384 // expression has an explicit C++ template argument list. 385 HasExplicitTemplateArgumentListFlag = 0x02 386 }; 387 388 // DecoratedD - The declaration that we are referencing, plus two bits to 389 // indicate whether (1) the declaration's name was explicitly qualified and 390 // (2) the declaration's name was followed by an explicit template 391 // argument list. 392 llvm::PointerIntPair<NamedDecl *, 2> DecoratedD; 393 394 // Loc - The location of the declaration name itself. 395 SourceLocation Loc; 396 397 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 398 NameQualifier *getNameQualifier() { 399 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 400 return 0; 401 402 return reinterpret_cast<NameQualifier *> (this + 1); 403 } 404 405 /// \brief Retrieve the qualifier that preceded the member name, if any. 406 const NameQualifier *getNameQualifier() const { 407 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 408 } 409 410 /// \brief Retrieve the explicit template argument list that followed the 411 /// member template name, if any. 412 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 413 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 414 return 0; 415 416 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 417 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 418 419 return reinterpret_cast<ExplicitTemplateArgumentList *>( 420 getNameQualifier() + 1); 421 } 422 423 /// \brief Retrieve the explicit template argument list that followed the 424 /// member template name, if any. 425 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 426 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 427 } 428 429 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 430 NamedDecl *D, SourceLocation NameLoc, 431 const TemplateArgumentListInfo *TemplateArgs, 432 QualType T); 433 434protected: 435 /// \brief Computes the type- and value-dependence flags for this 436 /// declaration reference expression. 437 void computeDependence(); 438 439 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 440 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 441 computeDependence(); 442 } 443 444public: 445 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 446 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 447 computeDependence(); 448 } 449 450 /// \brief Construct an empty declaration reference expression. 451 explicit DeclRefExpr(EmptyShell Empty) 452 : Expr(DeclRefExprClass, Empty) { } 453 454 static DeclRefExpr *Create(ASTContext &Context, 455 NestedNameSpecifier *Qualifier, 456 SourceRange QualifierRange, 457 NamedDecl *D, 458 SourceLocation NameLoc, 459 QualType T, 460 const TemplateArgumentListInfo *TemplateArgs = 0); 461 462 NamedDecl *getDecl() { return DecoratedD.getPointer(); } 463 const NamedDecl *getDecl() const { return DecoratedD.getPointer(); } 464 void setDecl(NamedDecl *NewD) { DecoratedD.setPointer(NewD); } 465 466 SourceLocation getLocation() const { return Loc; } 467 void setLocation(SourceLocation L) { Loc = L; } 468 virtual SourceRange getSourceRange() const; 469 470 /// \brief Determine whether this declaration reference was preceded by a 471 /// C++ nested-name-specifier, e.g., \c N::foo. 472 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 473 474 /// \brief If the name was qualified, retrieves the source range of 475 /// the nested-name-specifier that precedes the name. Otherwise, 476 /// returns an empty source range. 477 SourceRange getQualifierRange() const { 478 if (!hasQualifier()) 479 return SourceRange(); 480 481 return getNameQualifier()->Range; 482 } 483 484 /// \brief If the name was qualified, retrieves the nested-name-specifier 485 /// that precedes the name. Otherwise, returns NULL. 486 NestedNameSpecifier *getQualifier() const { 487 if (!hasQualifier()) 488 return 0; 489 490 return getNameQualifier()->NNS; 491 } 492 493 /// \brief Determines whether this member expression actually had a C++ 494 /// template argument list explicitly specified, e.g., x.f<int>. 495 bool hasExplicitTemplateArgumentList() const { 496 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 497 } 498 499 /// \brief Copies the template arguments (if present) into the given 500 /// structure. 501 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 502 if (hasExplicitTemplateArgumentList()) 503 getExplicitTemplateArgumentList()->copyInto(List); 504 } 505 506 /// \brief Retrieve the location of the left angle bracket following the 507 /// member name ('<'), if any. 508 SourceLocation getLAngleLoc() const { 509 if (!hasExplicitTemplateArgumentList()) 510 return SourceLocation(); 511 512 return getExplicitTemplateArgumentList()->LAngleLoc; 513 } 514 515 /// \brief Retrieve the template arguments provided as part of this 516 /// template-id. 517 const TemplateArgumentLoc *getTemplateArgs() const { 518 if (!hasExplicitTemplateArgumentList()) 519 return 0; 520 521 return getExplicitTemplateArgumentList()->getTemplateArgs(); 522 } 523 524 /// \brief Retrieve the number of template arguments provided as part of this 525 /// template-id. 526 unsigned getNumTemplateArgs() const { 527 if (!hasExplicitTemplateArgumentList()) 528 return 0; 529 530 return getExplicitTemplateArgumentList()->NumTemplateArgs; 531 } 532 533 /// \brief Retrieve the location of the right angle bracket following the 534 /// template arguments ('>'). 535 SourceLocation getRAngleLoc() const { 536 if (!hasExplicitTemplateArgumentList()) 537 return SourceLocation(); 538 539 return getExplicitTemplateArgumentList()->RAngleLoc; 540 } 541 542 static bool classof(const Stmt *T) { 543 return T->getStmtClass() == DeclRefExprClass || 544 T->getStmtClass() == CXXConditionDeclExprClass; 545 } 546 static bool classof(const DeclRefExpr *) { return true; } 547 548 // Iterators 549 virtual child_iterator child_begin(); 550 virtual child_iterator child_end(); 551}; 552 553/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 554class PredefinedExpr : public Expr { 555public: 556 enum IdentType { 557 Func, 558 Function, 559 PrettyFunction 560 }; 561 562private: 563 SourceLocation Loc; 564 IdentType Type; 565public: 566 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 567 : Expr(PredefinedExprClass, type, type->isDependentType(), 568 type->isDependentType()), Loc(l), Type(IT) {} 569 570 /// \brief Construct an empty predefined expression. 571 explicit PredefinedExpr(EmptyShell Empty) 572 : Expr(PredefinedExprClass, Empty) { } 573 574 IdentType getIdentType() const { return Type; } 575 void setIdentType(IdentType IT) { Type = IT; } 576 577 SourceLocation getLocation() const { return Loc; } 578 void setLocation(SourceLocation L) { Loc = L; } 579 580 static std::string ComputeName(ASTContext &Context, IdentType IT, 581 const Decl *CurrentDecl); 582 583 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 584 585 static bool classof(const Stmt *T) { 586 return T->getStmtClass() == PredefinedExprClass; 587 } 588 static bool classof(const PredefinedExpr *) { return true; } 589 590 // Iterators 591 virtual child_iterator child_begin(); 592 virtual child_iterator child_end(); 593}; 594 595class IntegerLiteral : public Expr { 596 llvm::APInt Value; 597 SourceLocation Loc; 598public: 599 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 600 // or UnsignedLongLongTy 601 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 602 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 603 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 604 } 605 606 /// \brief Construct an empty integer literal. 607 explicit IntegerLiteral(EmptyShell Empty) 608 : Expr(IntegerLiteralClass, Empty) { } 609 610 const llvm::APInt &getValue() const { return Value; } 611 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 612 613 /// \brief Retrieve the location of the literal. 614 SourceLocation getLocation() const { return Loc; } 615 616 void setValue(const llvm::APInt &Val) { Value = Val; } 617 void setLocation(SourceLocation Location) { Loc = Location; } 618 619 static bool classof(const Stmt *T) { 620 return T->getStmtClass() == IntegerLiteralClass; 621 } 622 static bool classof(const IntegerLiteral *) { return true; } 623 624 // Iterators 625 virtual child_iterator child_begin(); 626 virtual child_iterator child_end(); 627}; 628 629class CharacterLiteral : public Expr { 630 unsigned Value; 631 SourceLocation Loc; 632 bool IsWide; 633public: 634 // type should be IntTy 635 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 636 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 637 } 638 639 /// \brief Construct an empty character literal. 640 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 641 642 SourceLocation getLocation() const { return Loc; } 643 bool isWide() const { return IsWide; } 644 645 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 646 647 unsigned getValue() const { return Value; } 648 649 void setLocation(SourceLocation Location) { Loc = Location; } 650 void setWide(bool W) { IsWide = W; } 651 void setValue(unsigned Val) { Value = Val; } 652 653 static bool classof(const Stmt *T) { 654 return T->getStmtClass() == CharacterLiteralClass; 655 } 656 static bool classof(const CharacterLiteral *) { return true; } 657 658 // Iterators 659 virtual child_iterator child_begin(); 660 virtual child_iterator child_end(); 661}; 662 663class FloatingLiteral : public Expr { 664 llvm::APFloat Value; 665 bool IsExact : 1; 666 SourceLocation Loc; 667public: 668 FloatingLiteral(const llvm::APFloat &V, bool isexact, 669 QualType Type, SourceLocation L) 670 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 671 672 /// \brief Construct an empty floating-point literal. 673 explicit FloatingLiteral(EmptyShell Empty) 674 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 675 676 const llvm::APFloat &getValue() const { return Value; } 677 void setValue(const llvm::APFloat &Val) { Value = Val; } 678 679 bool isExact() const { return IsExact; } 680 void setExact(bool E) { IsExact = E; } 681 682 /// getValueAsApproximateDouble - This returns the value as an inaccurate 683 /// double. Note that this may cause loss of precision, but is useful for 684 /// debugging dumps, etc. 685 double getValueAsApproximateDouble() const; 686 687 SourceLocation getLocation() const { return Loc; } 688 void setLocation(SourceLocation L) { Loc = L; } 689 690 // FIXME: The logic for computing the value of a predefined expr should go 691 // into a method here that takes the inner-most code decl (a block, function 692 // or objc method) that the expr lives in. This would allow sema and codegen 693 // to be consistent for things like sizeof(__func__) etc. 694 695 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 696 697 static bool classof(const Stmt *T) { 698 return T->getStmtClass() == FloatingLiteralClass; 699 } 700 static bool classof(const FloatingLiteral *) { return true; } 701 702 // Iterators 703 virtual child_iterator child_begin(); 704 virtual child_iterator child_end(); 705}; 706 707/// ImaginaryLiteral - We support imaginary integer and floating point literals, 708/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 709/// IntegerLiteral classes. Instances of this class always have a Complex type 710/// whose element type matches the subexpression. 711/// 712class ImaginaryLiteral : public Expr { 713 Stmt *Val; 714public: 715 ImaginaryLiteral(Expr *val, QualType Ty) 716 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 717 718 /// \brief Build an empty imaginary literal. 719 explicit ImaginaryLiteral(EmptyShell Empty) 720 : Expr(ImaginaryLiteralClass, Empty) { } 721 722 const Expr *getSubExpr() const { return cast<Expr>(Val); } 723 Expr *getSubExpr() { return cast<Expr>(Val); } 724 void setSubExpr(Expr *E) { Val = E; } 725 726 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 727 static bool classof(const Stmt *T) { 728 return T->getStmtClass() == ImaginaryLiteralClass; 729 } 730 static bool classof(const ImaginaryLiteral *) { return true; } 731 732 // Iterators 733 virtual child_iterator child_begin(); 734 virtual child_iterator child_end(); 735}; 736 737/// StringLiteral - This represents a string literal expression, e.g. "foo" 738/// or L"bar" (wide strings). The actual string is returned by getStrData() 739/// is NOT null-terminated, and the length of the string is determined by 740/// calling getByteLength(). The C type for a string is always a 741/// ConstantArrayType. In C++, the char type is const qualified, in C it is 742/// not. 743/// 744/// Note that strings in C can be formed by concatenation of multiple string 745/// literal pptokens in translation phase #6. This keeps track of the locations 746/// of each of these pieces. 747/// 748/// Strings in C can also be truncated and extended by assigning into arrays, 749/// e.g. with constructs like: 750/// char X[2] = "foobar"; 751/// In this case, getByteLength() will return 6, but the string literal will 752/// have type "char[2]". 753class StringLiteral : public Expr { 754 const char *StrData; 755 unsigned ByteLength; 756 bool IsWide; 757 unsigned NumConcatenated; 758 SourceLocation TokLocs[1]; 759 760 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 761 762protected: 763 virtual void DoDestroy(ASTContext &C); 764 765public: 766 /// This is the "fully general" constructor that allows representation of 767 /// strings formed from multiple concatenated tokens. 768 static StringLiteral *Create(ASTContext &C, const char *StrData, 769 unsigned ByteLength, bool Wide, QualType Ty, 770 const SourceLocation *Loc, unsigned NumStrs); 771 772 /// Simple constructor for string literals made from one token. 773 static StringLiteral *Create(ASTContext &C, const char *StrData, 774 unsigned ByteLength, 775 bool Wide, QualType Ty, SourceLocation Loc) { 776 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 777 } 778 779 /// \brief Construct an empty string literal. 780 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 781 782 llvm::StringRef getString() const { 783 return llvm::StringRef(StrData, ByteLength); 784 } 785 // FIXME: These are deprecated, replace with StringRef. 786 const char *getStrData() const { return StrData; } 787 unsigned getByteLength() const { return ByteLength; } 788 789 /// \brief Sets the string data to the given string data. 790 void setString(ASTContext &C, llvm::StringRef Str); 791 792 bool isWide() const { return IsWide; } 793 void setWide(bool W) { IsWide = W; } 794 795 bool containsNonAsciiOrNull() const { 796 llvm::StringRef Str = getString(); 797 for (unsigned i = 0, e = Str.size(); i != e; ++i) 798 if (!isascii(Str[i]) || !Str[i]) 799 return true; 800 return false; 801 } 802 /// getNumConcatenated - Get the number of string literal tokens that were 803 /// concatenated in translation phase #6 to form this string literal. 804 unsigned getNumConcatenated() const { return NumConcatenated; } 805 806 SourceLocation getStrTokenLoc(unsigned TokNum) const { 807 assert(TokNum < NumConcatenated && "Invalid tok number"); 808 return TokLocs[TokNum]; 809 } 810 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 811 assert(TokNum < NumConcatenated && "Invalid tok number"); 812 TokLocs[TokNum] = L; 813 } 814 815 typedef const SourceLocation *tokloc_iterator; 816 tokloc_iterator tokloc_begin() const { return TokLocs; } 817 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 818 819 virtual SourceRange getSourceRange() const { 820 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 821 } 822 static bool classof(const Stmt *T) { 823 return T->getStmtClass() == StringLiteralClass; 824 } 825 static bool classof(const StringLiteral *) { return true; } 826 827 // Iterators 828 virtual child_iterator child_begin(); 829 virtual child_iterator child_end(); 830}; 831 832/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 833/// AST node is only formed if full location information is requested. 834class ParenExpr : public Expr { 835 SourceLocation L, R; 836 Stmt *Val; 837public: 838 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 839 : Expr(ParenExprClass, val->getType(), 840 val->isTypeDependent(), val->isValueDependent()), 841 L(l), R(r), Val(val) {} 842 843 /// \brief Construct an empty parenthesized expression. 844 explicit ParenExpr(EmptyShell Empty) 845 : Expr(ParenExprClass, Empty) { } 846 847 const Expr *getSubExpr() const { return cast<Expr>(Val); } 848 Expr *getSubExpr() { return cast<Expr>(Val); } 849 void setSubExpr(Expr *E) { Val = E; } 850 851 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 852 853 /// \brief Get the location of the left parentheses '('. 854 SourceLocation getLParen() const { return L; } 855 void setLParen(SourceLocation Loc) { L = Loc; } 856 857 /// \brief Get the location of the right parentheses ')'. 858 SourceLocation getRParen() const { return R; } 859 void setRParen(SourceLocation Loc) { R = Loc; } 860 861 static bool classof(const Stmt *T) { 862 return T->getStmtClass() == ParenExprClass; 863 } 864 static bool classof(const ParenExpr *) { return true; } 865 866 // Iterators 867 virtual child_iterator child_begin(); 868 virtual child_iterator child_end(); 869}; 870 871 872/// UnaryOperator - This represents the unary-expression's (except sizeof and 873/// alignof), the postinc/postdec operators from postfix-expression, and various 874/// extensions. 875/// 876/// Notes on various nodes: 877/// 878/// Real/Imag - These return the real/imag part of a complex operand. If 879/// applied to a non-complex value, the former returns its operand and the 880/// later returns zero in the type of the operand. 881/// 882/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 883/// subexpression is a compound literal with the various MemberExpr and 884/// ArraySubscriptExpr's applied to it. 885/// 886class UnaryOperator : public Expr { 887public: 888 // Note that additions to this should also update the StmtVisitor class. 889 enum Opcode { 890 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 891 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 892 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 893 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 894 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 895 Real, Imag, // "__real expr"/"__imag expr" Extension. 896 Extension, // __extension__ marker. 897 OffsetOf // __builtin_offsetof 898 }; 899private: 900 Stmt *Val; 901 Opcode Opc; 902 SourceLocation Loc; 903public: 904 905 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 906 : Expr(UnaryOperatorClass, type, 907 input->isTypeDependent() && opc != OffsetOf, 908 input->isValueDependent()), 909 Val(input), Opc(opc), Loc(l) {} 910 911 /// \brief Build an empty unary operator. 912 explicit UnaryOperator(EmptyShell Empty) 913 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 914 915 Opcode getOpcode() const { return Opc; } 916 void setOpcode(Opcode O) { Opc = O; } 917 918 Expr *getSubExpr() const { return cast<Expr>(Val); } 919 void setSubExpr(Expr *E) { Val = E; } 920 921 /// getOperatorLoc - Return the location of the operator. 922 SourceLocation getOperatorLoc() const { return Loc; } 923 void setOperatorLoc(SourceLocation L) { Loc = L; } 924 925 /// isPostfix - Return true if this is a postfix operation, like x++. 926 static bool isPostfix(Opcode Op) { 927 return Op == PostInc || Op == PostDec; 928 } 929 930 /// isPostfix - Return true if this is a prefix operation, like --x. 931 static bool isPrefix(Opcode Op) { 932 return Op == PreInc || Op == PreDec; 933 } 934 935 bool isPrefix() const { return isPrefix(Opc); } 936 bool isPostfix() const { return isPostfix(Opc); } 937 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 938 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 939 bool isOffsetOfOp() const { return Opc == OffsetOf; } 940 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 941 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 942 943 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 944 /// corresponds to, e.g. "sizeof" or "[pre]++" 945 static const char *getOpcodeStr(Opcode Op); 946 947 /// \brief Retrieve the unary opcode that corresponds to the given 948 /// overloaded operator. 949 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 950 951 /// \brief Retrieve the overloaded operator kind that corresponds to 952 /// the given unary opcode. 953 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 954 955 virtual SourceRange getSourceRange() const { 956 if (isPostfix()) 957 return SourceRange(Val->getLocStart(), Loc); 958 else 959 return SourceRange(Loc, Val->getLocEnd()); 960 } 961 virtual SourceLocation getExprLoc() const { return Loc; } 962 963 static bool classof(const Stmt *T) { 964 return T->getStmtClass() == UnaryOperatorClass; 965 } 966 static bool classof(const UnaryOperator *) { return true; } 967 968 // Iterators 969 virtual child_iterator child_begin(); 970 virtual child_iterator child_end(); 971}; 972 973/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 974/// types and expressions. 975class SizeOfAlignOfExpr : public Expr { 976 bool isSizeof : 1; // true if sizeof, false if alignof. 977 bool isType : 1; // true if operand is a type, false if an expression 978 union { 979 DeclaratorInfo *Ty; 980 Stmt *Ex; 981 } Argument; 982 SourceLocation OpLoc, RParenLoc; 983 984protected: 985 virtual void DoDestroy(ASTContext& C); 986 987public: 988 SizeOfAlignOfExpr(bool issizeof, DeclaratorInfo *DInfo, 989 QualType resultType, SourceLocation op, 990 SourceLocation rp) : 991 Expr(SizeOfAlignOfExprClass, resultType, 992 false, // Never type-dependent (C++ [temp.dep.expr]p3). 993 // Value-dependent if the argument is type-dependent. 994 DInfo->getType()->isDependentType()), 995 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 996 Argument.Ty = DInfo; 997 } 998 999 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1000 QualType resultType, SourceLocation op, 1001 SourceLocation rp) : 1002 Expr(SizeOfAlignOfExprClass, resultType, 1003 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1004 // Value-dependent if the argument is type-dependent. 1005 E->isTypeDependent()), 1006 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1007 Argument.Ex = E; 1008 } 1009 1010 /// \brief Construct an empty sizeof/alignof expression. 1011 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1012 : Expr(SizeOfAlignOfExprClass, Empty) { } 1013 1014 bool isSizeOf() const { return isSizeof; } 1015 void setSizeof(bool S) { isSizeof = S; } 1016 1017 bool isArgumentType() const { return isType; } 1018 QualType getArgumentType() const { 1019 return getArgumentTypeInfo()->getType(); 1020 } 1021 DeclaratorInfo *getArgumentTypeInfo() const { 1022 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1023 return Argument.Ty; 1024 } 1025 Expr *getArgumentExpr() { 1026 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1027 return static_cast<Expr*>(Argument.Ex); 1028 } 1029 const Expr *getArgumentExpr() const { 1030 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1031 } 1032 1033 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1034 void setArgument(DeclaratorInfo *DInfo) { 1035 Argument.Ty = DInfo; 1036 isType = true; 1037 } 1038 1039 /// Gets the argument type, or the type of the argument expression, whichever 1040 /// is appropriate. 1041 QualType getTypeOfArgument() const { 1042 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1043 } 1044 1045 SourceLocation getOperatorLoc() const { return OpLoc; } 1046 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1047 1048 SourceLocation getRParenLoc() const { return RParenLoc; } 1049 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1050 1051 virtual SourceRange getSourceRange() const { 1052 return SourceRange(OpLoc, RParenLoc); 1053 } 1054 1055 static bool classof(const Stmt *T) { 1056 return T->getStmtClass() == SizeOfAlignOfExprClass; 1057 } 1058 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1059 1060 // Iterators 1061 virtual child_iterator child_begin(); 1062 virtual child_iterator child_end(); 1063}; 1064 1065//===----------------------------------------------------------------------===// 1066// Postfix Operators. 1067//===----------------------------------------------------------------------===// 1068 1069/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1070class ArraySubscriptExpr : public Expr { 1071 enum { LHS, RHS, END_EXPR=2 }; 1072 Stmt* SubExprs[END_EXPR]; 1073 SourceLocation RBracketLoc; 1074public: 1075 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1076 SourceLocation rbracketloc) 1077 : Expr(ArraySubscriptExprClass, t, 1078 lhs->isTypeDependent() || rhs->isTypeDependent(), 1079 lhs->isValueDependent() || rhs->isValueDependent()), 1080 RBracketLoc(rbracketloc) { 1081 SubExprs[LHS] = lhs; 1082 SubExprs[RHS] = rhs; 1083 } 1084 1085 /// \brief Create an empty array subscript expression. 1086 explicit ArraySubscriptExpr(EmptyShell Shell) 1087 : Expr(ArraySubscriptExprClass, Shell) { } 1088 1089 /// An array access can be written A[4] or 4[A] (both are equivalent). 1090 /// - getBase() and getIdx() always present the normalized view: A[4]. 1091 /// In this case getBase() returns "A" and getIdx() returns "4". 1092 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1093 /// 4[A] getLHS() returns "4". 1094 /// Note: Because vector element access is also written A[4] we must 1095 /// predicate the format conversion in getBase and getIdx only on the 1096 /// the type of the RHS, as it is possible for the LHS to be a vector of 1097 /// integer type 1098 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1099 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1100 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1101 1102 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1103 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1104 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1105 1106 Expr *getBase() { 1107 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1108 } 1109 1110 const Expr *getBase() const { 1111 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1112 } 1113 1114 Expr *getIdx() { 1115 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1116 } 1117 1118 const Expr *getIdx() const { 1119 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1120 } 1121 1122 virtual SourceRange getSourceRange() const { 1123 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1124 } 1125 1126 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1127 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1128 1129 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1130 1131 static bool classof(const Stmt *T) { 1132 return T->getStmtClass() == ArraySubscriptExprClass; 1133 } 1134 static bool classof(const ArraySubscriptExpr *) { return true; } 1135 1136 // Iterators 1137 virtual child_iterator child_begin(); 1138 virtual child_iterator child_end(); 1139}; 1140 1141 1142/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1143/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1144/// while its subclasses may represent alternative syntax that (semantically) 1145/// results in a function call. For example, CXXOperatorCallExpr is 1146/// a subclass for overloaded operator calls that use operator syntax, e.g., 1147/// "str1 + str2" to resolve to a function call. 1148class CallExpr : public Expr { 1149 enum { FN=0, ARGS_START=1 }; 1150 Stmt **SubExprs; 1151 unsigned NumArgs; 1152 SourceLocation RParenLoc; 1153 1154protected: 1155 // This version of the constructor is for derived classes. 1156 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1157 QualType t, SourceLocation rparenloc); 1158 1159 virtual void DoDestroy(ASTContext& C); 1160 1161public: 1162 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1163 SourceLocation rparenloc); 1164 1165 /// \brief Build an empty call expression. 1166 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1167 1168 ~CallExpr() {} 1169 1170 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1171 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1172 void setCallee(Expr *F) { SubExprs[FN] = F; } 1173 1174 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1175 FunctionDecl *getDirectCallee(); 1176 const FunctionDecl *getDirectCallee() const { 1177 return const_cast<CallExpr*>(this)->getDirectCallee(); 1178 } 1179 1180 /// getNumArgs - Return the number of actual arguments to this call. 1181 /// 1182 unsigned getNumArgs() const { return NumArgs; } 1183 1184 /// getArg - Return the specified argument. 1185 Expr *getArg(unsigned Arg) { 1186 assert(Arg < NumArgs && "Arg access out of range!"); 1187 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1188 } 1189 const Expr *getArg(unsigned Arg) const { 1190 assert(Arg < NumArgs && "Arg access out of range!"); 1191 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1192 } 1193 1194 /// setArg - Set the specified argument. 1195 void setArg(unsigned Arg, Expr *ArgExpr) { 1196 assert(Arg < NumArgs && "Arg access out of range!"); 1197 SubExprs[Arg+ARGS_START] = ArgExpr; 1198 } 1199 1200 /// setNumArgs - This changes the number of arguments present in this call. 1201 /// Any orphaned expressions are deleted by this, and any new operands are set 1202 /// to null. 1203 void setNumArgs(ASTContext& C, unsigned NumArgs); 1204 1205 typedef ExprIterator arg_iterator; 1206 typedef ConstExprIterator const_arg_iterator; 1207 1208 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1209 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1210 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1211 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1212 1213 /// getNumCommas - Return the number of commas that must have been present in 1214 /// this function call. 1215 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1216 1217 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1218 /// not, return 0. 1219 unsigned isBuiltinCall(ASTContext &Context) const; 1220 1221 /// getCallReturnType - Get the return type of the call expr. This is not 1222 /// always the type of the expr itself, if the return type is a reference 1223 /// type. 1224 QualType getCallReturnType() const; 1225 1226 SourceLocation getRParenLoc() const { return RParenLoc; } 1227 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1228 1229 virtual SourceRange getSourceRange() const { 1230 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1231 } 1232 1233 static bool classof(const Stmt *T) { 1234 return T->getStmtClass() == CallExprClass || 1235 T->getStmtClass() == CXXOperatorCallExprClass || 1236 T->getStmtClass() == CXXMemberCallExprClass; 1237 } 1238 static bool classof(const CallExpr *) { return true; } 1239 static bool classof(const CXXOperatorCallExpr *) { return true; } 1240 static bool classof(const CXXMemberCallExpr *) { return true; } 1241 1242 // Iterators 1243 virtual child_iterator child_begin(); 1244 virtual child_iterator child_end(); 1245}; 1246 1247/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1248/// 1249class MemberExpr : public Expr { 1250 /// Base - the expression for the base pointer or structure references. In 1251 /// X.F, this is "X". 1252 Stmt *Base; 1253 1254 /// MemberDecl - This is the decl being referenced by the field/member name. 1255 /// In X.F, this is the decl referenced by F. 1256 NamedDecl *MemberDecl; 1257 1258 /// MemberLoc - This is the location of the member name. 1259 SourceLocation MemberLoc; 1260 1261 /// IsArrow - True if this is "X->F", false if this is "X.F". 1262 bool IsArrow : 1; 1263 1264 /// \brief True if this member expression used a nested-name-specifier to 1265 /// refer to the member, e.g., "x->Base::f". When true, a NameQualifier 1266 /// structure is allocated immediately after the MemberExpr. 1267 bool HasQualifier : 1; 1268 1269 /// \brief True if this member expression specified a template argument list 1270 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1271 /// structure (and its TemplateArguments) are allocated immediately after 1272 /// the MemberExpr or, if the member expression also has a qualifier, after 1273 /// the NameQualifier structure. 1274 bool HasExplicitTemplateArgumentList : 1; 1275 1276 /// \brief Retrieve the qualifier that preceded the member name, if any. 1277 NameQualifier *getMemberQualifier() { 1278 if (!HasQualifier) 1279 return 0; 1280 1281 return reinterpret_cast<NameQualifier *> (this + 1); 1282 } 1283 1284 /// \brief Retrieve the qualifier that preceded the member name, if any. 1285 const NameQualifier *getMemberQualifier() const { 1286 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1287 } 1288 1289 /// \brief Retrieve the explicit template argument list that followed the 1290 /// member template name, if any. 1291 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1292 if (!HasExplicitTemplateArgumentList) 1293 return 0; 1294 1295 if (!HasQualifier) 1296 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1297 1298 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1299 getMemberQualifier() + 1); 1300 } 1301 1302 /// \brief Retrieve the explicit template argument list that followed the 1303 /// member template name, if any. 1304 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1305 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1306 } 1307 1308 MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 1309 SourceRange qualrange, NamedDecl *memberdecl, SourceLocation l, 1310 const TemplateArgumentListInfo *targs, QualType ty); 1311 1312public: 1313 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1314 QualType ty) 1315 : Expr(MemberExprClass, ty, 1316 base->isTypeDependent(), base->isValueDependent()), 1317 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1318 HasQualifier(false), HasExplicitTemplateArgumentList(false) {} 1319 1320 /// \brief Build an empty member reference expression. 1321 explicit MemberExpr(EmptyShell Empty) 1322 : Expr(MemberExprClass, Empty), HasQualifier(false), 1323 HasExplicitTemplateArgumentList(false) { } 1324 1325 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1326 NestedNameSpecifier *qual, SourceRange qualrange, 1327 NamedDecl *memberdecl, 1328 SourceLocation l, 1329 const TemplateArgumentListInfo *targs, 1330 QualType ty); 1331 1332 void setBase(Expr *E) { Base = E; } 1333 Expr *getBase() const { return cast<Expr>(Base); } 1334 1335 /// \brief Retrieve the member declaration to which this expression refers. 1336 /// 1337 /// The returned declaration will either be a FieldDecl or (in C++) 1338 /// a CXXMethodDecl. 1339 NamedDecl *getMemberDecl() const { return MemberDecl; } 1340 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1341 1342 /// \brief Determines whether this member expression actually had 1343 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1344 /// x->Base::foo. 1345 bool hasQualifier() const { return HasQualifier; } 1346 1347 /// \brief If the member name was qualified, retrieves the source range of 1348 /// the nested-name-specifier that precedes the member name. Otherwise, 1349 /// returns an empty source range. 1350 SourceRange getQualifierRange() const { 1351 if (!HasQualifier) 1352 return SourceRange(); 1353 1354 return getMemberQualifier()->Range; 1355 } 1356 1357 /// \brief If the member name was qualified, retrieves the 1358 /// nested-name-specifier that precedes the member name. Otherwise, returns 1359 /// NULL. 1360 NestedNameSpecifier *getQualifier() const { 1361 if (!HasQualifier) 1362 return 0; 1363 1364 return getMemberQualifier()->NNS; 1365 } 1366 1367 /// \brief Determines whether this member expression actually had a C++ 1368 /// template argument list explicitly specified, e.g., x.f<int>. 1369 bool hasExplicitTemplateArgumentList() const { 1370 return HasExplicitTemplateArgumentList; 1371 } 1372 1373 /// \brief Copies the template arguments (if present) into the given 1374 /// structure. 1375 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1376 if (hasExplicitTemplateArgumentList()) 1377 getExplicitTemplateArgumentList()->copyInto(List); 1378 } 1379 1380 /// \brief Retrieve the location of the left angle bracket following the 1381 /// member name ('<'), if any. 1382 SourceLocation getLAngleLoc() const { 1383 if (!HasExplicitTemplateArgumentList) 1384 return SourceLocation(); 1385 1386 return getExplicitTemplateArgumentList()->LAngleLoc; 1387 } 1388 1389 /// \brief Retrieve the template arguments provided as part of this 1390 /// template-id. 1391 const TemplateArgumentLoc *getTemplateArgs() const { 1392 if (!HasExplicitTemplateArgumentList) 1393 return 0; 1394 1395 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1396 } 1397 1398 /// \brief Retrieve the number of template arguments provided as part of this 1399 /// template-id. 1400 unsigned getNumTemplateArgs() const { 1401 if (!HasExplicitTemplateArgumentList) 1402 return 0; 1403 1404 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1405 } 1406 1407 /// \brief Retrieve the location of the right angle bracket following the 1408 /// template arguments ('>'). 1409 SourceLocation getRAngleLoc() const { 1410 if (!HasExplicitTemplateArgumentList) 1411 return SourceLocation(); 1412 1413 return getExplicitTemplateArgumentList()->RAngleLoc; 1414 } 1415 1416 bool isArrow() const { return IsArrow; } 1417 void setArrow(bool A) { IsArrow = A; } 1418 1419 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1420 /// location of 'F'. 1421 SourceLocation getMemberLoc() const { return MemberLoc; } 1422 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1423 1424 virtual SourceRange getSourceRange() const { 1425 // If we have an implicit base (like a C++ implicit this), 1426 // make sure not to return its location 1427 SourceLocation EndLoc = MemberLoc; 1428 if (HasExplicitTemplateArgumentList) 1429 EndLoc = getRAngleLoc(); 1430 1431 SourceLocation BaseLoc = getBase()->getLocStart(); 1432 if (BaseLoc.isInvalid()) 1433 return SourceRange(MemberLoc, EndLoc); 1434 return SourceRange(BaseLoc, EndLoc); 1435 } 1436 1437 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1438 1439 static bool classof(const Stmt *T) { 1440 return T->getStmtClass() == MemberExprClass; 1441 } 1442 static bool classof(const MemberExpr *) { return true; } 1443 1444 // Iterators 1445 virtual child_iterator child_begin(); 1446 virtual child_iterator child_end(); 1447}; 1448 1449/// CompoundLiteralExpr - [C99 6.5.2.5] 1450/// 1451class CompoundLiteralExpr : public Expr { 1452 /// LParenLoc - If non-null, this is the location of the left paren in a 1453 /// compound literal like "(int){4}". This can be null if this is a 1454 /// synthesized compound expression. 1455 SourceLocation LParenLoc; 1456 Stmt *Init; 1457 bool FileScope; 1458public: 1459 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1460 bool fileScope) 1461 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1462 FileScope(fileScope) {} 1463 1464 /// \brief Construct an empty compound literal. 1465 explicit CompoundLiteralExpr(EmptyShell Empty) 1466 : Expr(CompoundLiteralExprClass, Empty) { } 1467 1468 const Expr *getInitializer() const { return cast<Expr>(Init); } 1469 Expr *getInitializer() { return cast<Expr>(Init); } 1470 void setInitializer(Expr *E) { Init = E; } 1471 1472 bool isFileScope() const { return FileScope; } 1473 void setFileScope(bool FS) { FileScope = FS; } 1474 1475 SourceLocation getLParenLoc() const { return LParenLoc; } 1476 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1477 1478 virtual SourceRange getSourceRange() const { 1479 // FIXME: Init should never be null. 1480 if (!Init) 1481 return SourceRange(); 1482 if (LParenLoc.isInvalid()) 1483 return Init->getSourceRange(); 1484 return SourceRange(LParenLoc, Init->getLocEnd()); 1485 } 1486 1487 static bool classof(const Stmt *T) { 1488 return T->getStmtClass() == CompoundLiteralExprClass; 1489 } 1490 static bool classof(const CompoundLiteralExpr *) { return true; } 1491 1492 // Iterators 1493 virtual child_iterator child_begin(); 1494 virtual child_iterator child_end(); 1495}; 1496 1497/// CastExpr - Base class for type casts, including both implicit 1498/// casts (ImplicitCastExpr) and explicit casts that have some 1499/// representation in the source code (ExplicitCastExpr's derived 1500/// classes). 1501class CastExpr : public Expr { 1502public: 1503 /// CastKind - the kind of cast this represents. 1504 enum CastKind { 1505 /// CK_Unknown - Unknown cast kind. 1506 /// FIXME: The goal is to get rid of this and make all casts have a 1507 /// kind so that the AST client doesn't have to try to figure out what's 1508 /// going on. 1509 CK_Unknown, 1510 1511 /// CK_BitCast - Used for reinterpret_cast. 1512 CK_BitCast, 1513 1514 /// CK_NoOp - Used for const_cast. 1515 CK_NoOp, 1516 1517 /// CK_BaseToDerived - Base to derived class casts. 1518 CK_BaseToDerived, 1519 1520 /// CK_DerivedToBase - Derived to base class casts. 1521 CK_DerivedToBase, 1522 1523 /// CK_Dynamic - Dynamic cast. 1524 CK_Dynamic, 1525 1526 /// CK_ToUnion - Cast to union (GCC extension). 1527 CK_ToUnion, 1528 1529 /// CK_ArrayToPointerDecay - Array to pointer decay. 1530 CK_ArrayToPointerDecay, 1531 1532 // CK_FunctionToPointerDecay - Function to pointer decay. 1533 CK_FunctionToPointerDecay, 1534 1535 /// CK_NullToMemberPointer - Null pointer to member pointer. 1536 CK_NullToMemberPointer, 1537 1538 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1539 /// member pointer in derived class. 1540 CK_BaseToDerivedMemberPointer, 1541 1542 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1543 /// member pointer in base class. 1544 CK_DerivedToBaseMemberPointer, 1545 1546 /// CK_UserDefinedConversion - Conversion using a user defined type 1547 /// conversion function. 1548 CK_UserDefinedConversion, 1549 1550 /// CK_ConstructorConversion - Conversion by constructor 1551 CK_ConstructorConversion, 1552 1553 /// CK_IntegralToPointer - Integral to pointer 1554 CK_IntegralToPointer, 1555 1556 /// CK_PointerToIntegral - Pointer to integral 1557 CK_PointerToIntegral, 1558 1559 /// CK_ToVoid - Cast to void. 1560 CK_ToVoid, 1561 1562 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1563 /// vector type with the same element type as the src type. Splats the 1564 /// src expression into the destination expression. 1565 CK_VectorSplat, 1566 1567 /// CK_IntegralCast - Casting between integral types of different size. 1568 CK_IntegralCast, 1569 1570 /// CK_IntegralToFloating - Integral to floating point. 1571 CK_IntegralToFloating, 1572 1573 /// CK_FloatingToIntegral - Floating point to integral. 1574 CK_FloatingToIntegral, 1575 1576 /// CK_FloatingCast - Casting between floating types of different size. 1577 CK_FloatingCast, 1578 1579 /// CK_MemberPointerToBoolean - Member pointer to boolean 1580 CK_MemberPointerToBoolean 1581 1582 }; 1583 1584private: 1585 CastKind Kind; 1586 Stmt *Op; 1587protected: 1588 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op) : 1589 Expr(SC, ty, 1590 // Cast expressions are type-dependent if the type is 1591 // dependent (C++ [temp.dep.expr]p3). 1592 ty->isDependentType(), 1593 // Cast expressions are value-dependent if the type is 1594 // dependent or if the subexpression is value-dependent. 1595 ty->isDependentType() || (op && op->isValueDependent())), 1596 Kind(kind), Op(op) {} 1597 1598 /// \brief Construct an empty cast. 1599 CastExpr(StmtClass SC, EmptyShell Empty) 1600 : Expr(SC, Empty) { } 1601 1602public: 1603 CastKind getCastKind() const { return Kind; } 1604 void setCastKind(CastKind K) { Kind = K; } 1605 const char *getCastKindName() const; 1606 1607 Expr *getSubExpr() { return cast<Expr>(Op); } 1608 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1609 void setSubExpr(Expr *E) { Op = E; } 1610 1611 static bool classof(const Stmt *T) { 1612 StmtClass SC = T->getStmtClass(); 1613 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1614 return true; 1615 1616 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1617 return true; 1618 1619 return false; 1620 } 1621 static bool classof(const CastExpr *) { return true; } 1622 1623 // Iterators 1624 virtual child_iterator child_begin(); 1625 virtual child_iterator child_end(); 1626}; 1627 1628/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1629/// conversions, which have no direct representation in the original 1630/// source code. For example: converting T[]->T*, void f()->void 1631/// (*f)(), float->double, short->int, etc. 1632/// 1633/// In C, implicit casts always produce rvalues. However, in C++, an 1634/// implicit cast whose result is being bound to a reference will be 1635/// an lvalue. For example: 1636/// 1637/// @code 1638/// class Base { }; 1639/// class Derived : public Base { }; 1640/// void f(Derived d) { 1641/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1642/// } 1643/// @endcode 1644class ImplicitCastExpr : public CastExpr { 1645 /// LvalueCast - Whether this cast produces an lvalue. 1646 bool LvalueCast; 1647 1648public: 1649 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1650 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1651 1652 /// \brief Construct an empty implicit cast. 1653 explicit ImplicitCastExpr(EmptyShell Shell) 1654 : CastExpr(ImplicitCastExprClass, Shell) { } 1655 1656 1657 virtual SourceRange getSourceRange() const { 1658 return getSubExpr()->getSourceRange(); 1659 } 1660 1661 /// isLvalueCast - Whether this cast produces an lvalue. 1662 bool isLvalueCast() const { return LvalueCast; } 1663 1664 /// setLvalueCast - Set whether this cast produces an lvalue. 1665 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1666 1667 static bool classof(const Stmt *T) { 1668 return T->getStmtClass() == ImplicitCastExprClass; 1669 } 1670 static bool classof(const ImplicitCastExpr *) { return true; } 1671}; 1672 1673/// ExplicitCastExpr - An explicit cast written in the source 1674/// code. 1675/// 1676/// This class is effectively an abstract class, because it provides 1677/// the basic representation of an explicitly-written cast without 1678/// specifying which kind of cast (C cast, functional cast, static 1679/// cast, etc.) was written; specific derived classes represent the 1680/// particular style of cast and its location information. 1681/// 1682/// Unlike implicit casts, explicit cast nodes have two different 1683/// types: the type that was written into the source code, and the 1684/// actual type of the expression as determined by semantic 1685/// analysis. These types may differ slightly. For example, in C++ one 1686/// can cast to a reference type, which indicates that the resulting 1687/// expression will be an lvalue. The reference type, however, will 1688/// not be used as the type of the expression. 1689class ExplicitCastExpr : public CastExpr { 1690 /// TypeAsWritten - The type that this expression is casting to, as 1691 /// written in the source code. 1692 QualType TypeAsWritten; 1693 1694protected: 1695 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1696 Expr *op, QualType writtenTy) 1697 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1698 1699 /// \brief Construct an empty explicit cast. 1700 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1701 : CastExpr(SC, Shell) { } 1702 1703public: 1704 /// getTypeAsWritten - Returns the type that this expression is 1705 /// casting to, as written in the source code. 1706 QualType getTypeAsWritten() const { return TypeAsWritten; } 1707 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1708 1709 static bool classof(const Stmt *T) { 1710 StmtClass SC = T->getStmtClass(); 1711 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1712 return true; 1713 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1714 return true; 1715 1716 return false; 1717 } 1718 static bool classof(const ExplicitCastExpr *) { return true; } 1719}; 1720 1721/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1722/// cast in C++ (C++ [expr.cast]), which uses the syntax 1723/// (Type)expr. For example: @c (int)f. 1724class CStyleCastExpr : public ExplicitCastExpr { 1725 SourceLocation LPLoc; // the location of the left paren 1726 SourceLocation RPLoc; // the location of the right paren 1727public: 1728 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1729 SourceLocation l, SourceLocation r) : 1730 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1731 LPLoc(l), RPLoc(r) {} 1732 1733 /// \brief Construct an empty C-style explicit cast. 1734 explicit CStyleCastExpr(EmptyShell Shell) 1735 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1736 1737 SourceLocation getLParenLoc() const { return LPLoc; } 1738 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1739 1740 SourceLocation getRParenLoc() const { return RPLoc; } 1741 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1742 1743 virtual SourceRange getSourceRange() const { 1744 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1745 } 1746 static bool classof(const Stmt *T) { 1747 return T->getStmtClass() == CStyleCastExprClass; 1748 } 1749 static bool classof(const CStyleCastExpr *) { return true; } 1750}; 1751 1752/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1753/// 1754/// This expression node kind describes a builtin binary operation, 1755/// such as "x + y" for integer values "x" and "y". The operands will 1756/// already have been converted to appropriate types (e.g., by 1757/// performing promotions or conversions). 1758/// 1759/// In C++, where operators may be overloaded, a different kind of 1760/// expression node (CXXOperatorCallExpr) is used to express the 1761/// invocation of an overloaded operator with operator syntax. Within 1762/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1763/// used to store an expression "x + y" depends on the subexpressions 1764/// for x and y. If neither x or y is type-dependent, and the "+" 1765/// operator resolves to a built-in operation, BinaryOperator will be 1766/// used to express the computation (x and y may still be 1767/// value-dependent). If either x or y is type-dependent, or if the 1768/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1769/// be used to express the computation. 1770class BinaryOperator : public Expr { 1771public: 1772 enum Opcode { 1773 // Operators listed in order of precedence. 1774 // Note that additions to this should also update the StmtVisitor class. 1775 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1776 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1777 Add, Sub, // [C99 6.5.6] Additive operators. 1778 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1779 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1780 EQ, NE, // [C99 6.5.9] Equality operators. 1781 And, // [C99 6.5.10] Bitwise AND operator. 1782 Xor, // [C99 6.5.11] Bitwise XOR operator. 1783 Or, // [C99 6.5.12] Bitwise OR operator. 1784 LAnd, // [C99 6.5.13] Logical AND operator. 1785 LOr, // [C99 6.5.14] Logical OR operator. 1786 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1787 DivAssign, RemAssign, 1788 AddAssign, SubAssign, 1789 ShlAssign, ShrAssign, 1790 AndAssign, XorAssign, 1791 OrAssign, 1792 Comma // [C99 6.5.17] Comma operator. 1793 }; 1794private: 1795 enum { LHS, RHS, END_EXPR }; 1796 Stmt* SubExprs[END_EXPR]; 1797 Opcode Opc; 1798 SourceLocation OpLoc; 1799public: 1800 1801 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1802 SourceLocation opLoc) 1803 : Expr(BinaryOperatorClass, ResTy, 1804 lhs->isTypeDependent() || rhs->isTypeDependent(), 1805 lhs->isValueDependent() || rhs->isValueDependent()), 1806 Opc(opc), OpLoc(opLoc) { 1807 SubExprs[LHS] = lhs; 1808 SubExprs[RHS] = rhs; 1809 assert(!isCompoundAssignmentOp() && 1810 "Use ArithAssignBinaryOperator for compound assignments"); 1811 } 1812 1813 /// \brief Construct an empty binary operator. 1814 explicit BinaryOperator(EmptyShell Empty) 1815 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1816 1817 SourceLocation getOperatorLoc() const { return OpLoc; } 1818 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1819 1820 Opcode getOpcode() const { return Opc; } 1821 void setOpcode(Opcode O) { Opc = O; } 1822 1823 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1824 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1825 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1826 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1827 1828 virtual SourceRange getSourceRange() const { 1829 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1830 } 1831 1832 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1833 /// corresponds to, e.g. "<<=". 1834 static const char *getOpcodeStr(Opcode Op); 1835 1836 /// \brief Retrieve the binary opcode that corresponds to the given 1837 /// overloaded operator. 1838 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1839 1840 /// \brief Retrieve the overloaded operator kind that corresponds to 1841 /// the given binary opcode. 1842 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1843 1844 /// predicates to categorize the respective opcodes. 1845 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1846 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1847 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1848 bool isShiftOp() const { return isShiftOp(Opc); } 1849 1850 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1851 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1852 1853 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1854 bool isRelationalOp() const { return isRelationalOp(Opc); } 1855 1856 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1857 bool isEqualityOp() const { return isEqualityOp(Opc); } 1858 1859 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1860 bool isComparisonOp() const { return isComparisonOp(Opc); } 1861 1862 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1863 bool isLogicalOp() const { return isLogicalOp(Opc); } 1864 1865 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1866 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1867 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1868 1869 static bool classof(const Stmt *S) { 1870 return S->getStmtClass() == BinaryOperatorClass || 1871 S->getStmtClass() == CompoundAssignOperatorClass; 1872 } 1873 static bool classof(const BinaryOperator *) { return true; } 1874 1875 // Iterators 1876 virtual child_iterator child_begin(); 1877 virtual child_iterator child_end(); 1878 1879protected: 1880 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1881 SourceLocation oploc, bool dead) 1882 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1883 SubExprs[LHS] = lhs; 1884 SubExprs[RHS] = rhs; 1885 } 1886 1887 BinaryOperator(StmtClass SC, EmptyShell Empty) 1888 : Expr(SC, Empty), Opc(MulAssign) { } 1889}; 1890 1891/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1892/// track of the type the operation is performed in. Due to the semantics of 1893/// these operators, the operands are promoted, the aritmetic performed, an 1894/// implicit conversion back to the result type done, then the assignment takes 1895/// place. This captures the intermediate type which the computation is done 1896/// in. 1897class CompoundAssignOperator : public BinaryOperator { 1898 QualType ComputationLHSType; 1899 QualType ComputationResultType; 1900public: 1901 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1902 QualType ResType, QualType CompLHSType, 1903 QualType CompResultType, 1904 SourceLocation OpLoc) 1905 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1906 ComputationLHSType(CompLHSType), 1907 ComputationResultType(CompResultType) { 1908 assert(isCompoundAssignmentOp() && 1909 "Only should be used for compound assignments"); 1910 } 1911 1912 /// \brief Build an empty compound assignment operator expression. 1913 explicit CompoundAssignOperator(EmptyShell Empty) 1914 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1915 1916 // The two computation types are the type the LHS is converted 1917 // to for the computation and the type of the result; the two are 1918 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1919 QualType getComputationLHSType() const { return ComputationLHSType; } 1920 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1921 1922 QualType getComputationResultType() const { return ComputationResultType; } 1923 void setComputationResultType(QualType T) { ComputationResultType = T; } 1924 1925 static bool classof(const CompoundAssignOperator *) { return true; } 1926 static bool classof(const Stmt *S) { 1927 return S->getStmtClass() == CompoundAssignOperatorClass; 1928 } 1929}; 1930 1931/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1932/// GNU "missing LHS" extension is in use. 1933/// 1934class ConditionalOperator : public Expr { 1935 enum { COND, LHS, RHS, END_EXPR }; 1936 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1937 SourceLocation QuestionLoc, ColonLoc; 1938public: 1939 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1940 SourceLocation CLoc, Expr *rhs, QualType t) 1941 : Expr(ConditionalOperatorClass, t, 1942 // FIXME: the type of the conditional operator doesn't 1943 // depend on the type of the conditional, but the standard 1944 // seems to imply that it could. File a bug! 1945 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1946 (cond->isValueDependent() || 1947 (lhs && lhs->isValueDependent()) || 1948 (rhs && rhs->isValueDependent()))), 1949 QuestionLoc(QLoc), 1950 ColonLoc(CLoc) { 1951 SubExprs[COND] = cond; 1952 SubExprs[LHS] = lhs; 1953 SubExprs[RHS] = rhs; 1954 } 1955 1956 /// \brief Build an empty conditional operator. 1957 explicit ConditionalOperator(EmptyShell Empty) 1958 : Expr(ConditionalOperatorClass, Empty) { } 1959 1960 // getCond - Return the expression representing the condition for 1961 // the ?: operator. 1962 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1963 void setCond(Expr *E) { SubExprs[COND] = E; } 1964 1965 // getTrueExpr - Return the subexpression representing the value of the ?: 1966 // expression if the condition evaluates to true. In most cases this value 1967 // will be the same as getLHS() except a GCC extension allows the left 1968 // subexpression to be omitted, and instead of the condition be returned. 1969 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1970 // is only evaluated once. 1971 Expr *getTrueExpr() const { 1972 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1973 } 1974 1975 // getTrueExpr - Return the subexpression representing the value of the ?: 1976 // expression if the condition evaluates to false. This is the same as getRHS. 1977 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1978 1979 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1980 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1981 1982 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1983 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1984 1985 SourceLocation getQuestionLoc() const { return QuestionLoc; } 1986 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 1987 1988 SourceLocation getColonLoc() const { return ColonLoc; } 1989 void setColonLoc(SourceLocation L) { ColonLoc = L; } 1990 1991 virtual SourceRange getSourceRange() const { 1992 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1993 } 1994 static bool classof(const Stmt *T) { 1995 return T->getStmtClass() == ConditionalOperatorClass; 1996 } 1997 static bool classof(const ConditionalOperator *) { return true; } 1998 1999 // Iterators 2000 virtual child_iterator child_begin(); 2001 virtual child_iterator child_end(); 2002}; 2003 2004/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2005class AddrLabelExpr : public Expr { 2006 SourceLocation AmpAmpLoc, LabelLoc; 2007 LabelStmt *Label; 2008public: 2009 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2010 QualType t) 2011 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2012 2013 /// \brief Build an empty address of a label expression. 2014 explicit AddrLabelExpr(EmptyShell Empty) 2015 : Expr(AddrLabelExprClass, Empty) { } 2016 2017 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2018 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2019 SourceLocation getLabelLoc() const { return LabelLoc; } 2020 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2021 2022 virtual SourceRange getSourceRange() const { 2023 return SourceRange(AmpAmpLoc, LabelLoc); 2024 } 2025 2026 LabelStmt *getLabel() const { return Label; } 2027 void setLabel(LabelStmt *S) { Label = S; } 2028 2029 static bool classof(const Stmt *T) { 2030 return T->getStmtClass() == AddrLabelExprClass; 2031 } 2032 static bool classof(const AddrLabelExpr *) { return true; } 2033 2034 // Iterators 2035 virtual child_iterator child_begin(); 2036 virtual child_iterator child_end(); 2037}; 2038 2039/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2040/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2041/// takes the value of the last subexpression. 2042class StmtExpr : public Expr { 2043 Stmt *SubStmt; 2044 SourceLocation LParenLoc, RParenLoc; 2045public: 2046 StmtExpr(CompoundStmt *substmt, QualType T, 2047 SourceLocation lp, SourceLocation rp) : 2048 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2049 2050 /// \brief Build an empty statement expression. 2051 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2052 2053 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2054 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2055 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2056 2057 virtual SourceRange getSourceRange() const { 2058 return SourceRange(LParenLoc, RParenLoc); 2059 } 2060 2061 SourceLocation getLParenLoc() const { return LParenLoc; } 2062 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2063 SourceLocation getRParenLoc() const { return RParenLoc; } 2064 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2065 2066 static bool classof(const Stmt *T) { 2067 return T->getStmtClass() == StmtExprClass; 2068 } 2069 static bool classof(const StmtExpr *) { return true; } 2070 2071 // Iterators 2072 virtual child_iterator child_begin(); 2073 virtual child_iterator child_end(); 2074}; 2075 2076/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2077/// This AST node represents a function that returns 1 if two *types* (not 2078/// expressions) are compatible. The result of this built-in function can be 2079/// used in integer constant expressions. 2080class TypesCompatibleExpr : public Expr { 2081 QualType Type1; 2082 QualType Type2; 2083 SourceLocation BuiltinLoc, RParenLoc; 2084public: 2085 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2086 QualType t1, QualType t2, SourceLocation RP) : 2087 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 2088 BuiltinLoc(BLoc), RParenLoc(RP) {} 2089 2090 /// \brief Build an empty __builtin_type_compatible_p expression. 2091 explicit TypesCompatibleExpr(EmptyShell Empty) 2092 : Expr(TypesCompatibleExprClass, Empty) { } 2093 2094 QualType getArgType1() const { return Type1; } 2095 void setArgType1(QualType T) { Type1 = T; } 2096 QualType getArgType2() const { return Type2; } 2097 void setArgType2(QualType T) { Type2 = T; } 2098 2099 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2100 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2101 2102 SourceLocation getRParenLoc() const { return RParenLoc; } 2103 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2104 2105 virtual SourceRange getSourceRange() const { 2106 return SourceRange(BuiltinLoc, RParenLoc); 2107 } 2108 static bool classof(const Stmt *T) { 2109 return T->getStmtClass() == TypesCompatibleExprClass; 2110 } 2111 static bool classof(const TypesCompatibleExpr *) { return true; } 2112 2113 // Iterators 2114 virtual child_iterator child_begin(); 2115 virtual child_iterator child_end(); 2116}; 2117 2118/// ShuffleVectorExpr - clang-specific builtin-in function 2119/// __builtin_shufflevector. 2120/// This AST node represents a operator that does a constant 2121/// shuffle, similar to LLVM's shufflevector instruction. It takes 2122/// two vectors and a variable number of constant indices, 2123/// and returns the appropriately shuffled vector. 2124class ShuffleVectorExpr : public Expr { 2125 SourceLocation BuiltinLoc, RParenLoc; 2126 2127 // SubExprs - the list of values passed to the __builtin_shufflevector 2128 // function. The first two are vectors, and the rest are constant 2129 // indices. The number of values in this list is always 2130 // 2+the number of indices in the vector type. 2131 Stmt **SubExprs; 2132 unsigned NumExprs; 2133 2134protected: 2135 virtual void DoDestroy(ASTContext &C); 2136 2137public: 2138 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2139 QualType Type, SourceLocation BLoc, 2140 SourceLocation RP) : 2141 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 2142 RParenLoc(RP), NumExprs(nexpr) { 2143 2144 SubExprs = new (C) Stmt*[nexpr]; 2145 for (unsigned i = 0; i < nexpr; i++) 2146 SubExprs[i] = args[i]; 2147 } 2148 2149 /// \brief Build an empty vector-shuffle expression. 2150 explicit ShuffleVectorExpr(EmptyShell Empty) 2151 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2152 2153 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2154 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2155 2156 SourceLocation getRParenLoc() const { return RParenLoc; } 2157 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2158 2159 virtual SourceRange getSourceRange() const { 2160 return SourceRange(BuiltinLoc, RParenLoc); 2161 } 2162 static bool classof(const Stmt *T) { 2163 return T->getStmtClass() == ShuffleVectorExprClass; 2164 } 2165 static bool classof(const ShuffleVectorExpr *) { return true; } 2166 2167 ~ShuffleVectorExpr() {} 2168 2169 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2170 /// constant expression, the actual arguments passed in, and the function 2171 /// pointers. 2172 unsigned getNumSubExprs() const { return NumExprs; } 2173 2174 /// getExpr - Return the Expr at the specified index. 2175 Expr *getExpr(unsigned Index) { 2176 assert((Index < NumExprs) && "Arg access out of range!"); 2177 return cast<Expr>(SubExprs[Index]); 2178 } 2179 const Expr *getExpr(unsigned Index) const { 2180 assert((Index < NumExprs) && "Arg access out of range!"); 2181 return cast<Expr>(SubExprs[Index]); 2182 } 2183 2184 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2185 2186 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2187 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2188 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2189 } 2190 2191 // Iterators 2192 virtual child_iterator child_begin(); 2193 virtual child_iterator child_end(); 2194}; 2195 2196/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2197/// This AST node is similar to the conditional operator (?:) in C, with 2198/// the following exceptions: 2199/// - the test expression must be a integer constant expression. 2200/// - the expression returned acts like the chosen subexpression in every 2201/// visible way: the type is the same as that of the chosen subexpression, 2202/// and all predicates (whether it's an l-value, whether it's an integer 2203/// constant expression, etc.) return the same result as for the chosen 2204/// sub-expression. 2205class ChooseExpr : public Expr { 2206 enum { COND, LHS, RHS, END_EXPR }; 2207 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2208 SourceLocation BuiltinLoc, RParenLoc; 2209public: 2210 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2211 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2212 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2213 BuiltinLoc(BLoc), RParenLoc(RP) { 2214 SubExprs[COND] = cond; 2215 SubExprs[LHS] = lhs; 2216 SubExprs[RHS] = rhs; 2217 } 2218 2219 /// \brief Build an empty __builtin_choose_expr. 2220 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2221 2222 /// isConditionTrue - Return whether the condition is true (i.e. not 2223 /// equal to zero). 2224 bool isConditionTrue(ASTContext &C) const; 2225 2226 /// getChosenSubExpr - Return the subexpression chosen according to the 2227 /// condition. 2228 Expr *getChosenSubExpr(ASTContext &C) const { 2229 return isConditionTrue(C) ? getLHS() : getRHS(); 2230 } 2231 2232 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2233 void setCond(Expr *E) { SubExprs[COND] = E; } 2234 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2235 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2236 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2237 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2238 2239 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2240 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2241 2242 SourceLocation getRParenLoc() const { return RParenLoc; } 2243 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2244 2245 virtual SourceRange getSourceRange() const { 2246 return SourceRange(BuiltinLoc, RParenLoc); 2247 } 2248 static bool classof(const Stmt *T) { 2249 return T->getStmtClass() == ChooseExprClass; 2250 } 2251 static bool classof(const ChooseExpr *) { return true; } 2252 2253 // Iterators 2254 virtual child_iterator child_begin(); 2255 virtual child_iterator child_end(); 2256}; 2257 2258/// GNUNullExpr - Implements the GNU __null extension, which is a name 2259/// for a null pointer constant that has integral type (e.g., int or 2260/// long) and is the same size and alignment as a pointer. The __null 2261/// extension is typically only used by system headers, which define 2262/// NULL as __null in C++ rather than using 0 (which is an integer 2263/// that may not match the size of a pointer). 2264class GNUNullExpr : public Expr { 2265 /// TokenLoc - The location of the __null keyword. 2266 SourceLocation TokenLoc; 2267 2268public: 2269 GNUNullExpr(QualType Ty, SourceLocation Loc) 2270 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 2271 2272 /// \brief Build an empty GNU __null expression. 2273 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2274 2275 /// getTokenLocation - The location of the __null token. 2276 SourceLocation getTokenLocation() const { return TokenLoc; } 2277 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2278 2279 virtual SourceRange getSourceRange() const { 2280 return SourceRange(TokenLoc); 2281 } 2282 static bool classof(const Stmt *T) { 2283 return T->getStmtClass() == GNUNullExprClass; 2284 } 2285 static bool classof(const GNUNullExpr *) { return true; } 2286 2287 // Iterators 2288 virtual child_iterator child_begin(); 2289 virtual child_iterator child_end(); 2290}; 2291 2292/// VAArgExpr, used for the builtin function __builtin_va_start. 2293class VAArgExpr : public Expr { 2294 Stmt *Val; 2295 SourceLocation BuiltinLoc, RParenLoc; 2296public: 2297 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2298 : Expr(VAArgExprClass, t), 2299 Val(e), 2300 BuiltinLoc(BLoc), 2301 RParenLoc(RPLoc) { } 2302 2303 /// \brief Create an empty __builtin_va_start expression. 2304 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2305 2306 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2307 Expr *getSubExpr() { return cast<Expr>(Val); } 2308 void setSubExpr(Expr *E) { Val = E; } 2309 2310 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2311 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2312 2313 SourceLocation getRParenLoc() const { return RParenLoc; } 2314 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2315 2316 virtual SourceRange getSourceRange() const { 2317 return SourceRange(BuiltinLoc, RParenLoc); 2318 } 2319 static bool classof(const Stmt *T) { 2320 return T->getStmtClass() == VAArgExprClass; 2321 } 2322 static bool classof(const VAArgExpr *) { return true; } 2323 2324 // Iterators 2325 virtual child_iterator child_begin(); 2326 virtual child_iterator child_end(); 2327}; 2328 2329/// @brief Describes an C or C++ initializer list. 2330/// 2331/// InitListExpr describes an initializer list, which can be used to 2332/// initialize objects of different types, including 2333/// struct/class/union types, arrays, and vectors. For example: 2334/// 2335/// @code 2336/// struct foo x = { 1, { 2, 3 } }; 2337/// @endcode 2338/// 2339/// Prior to semantic analysis, an initializer list will represent the 2340/// initializer list as written by the user, but will have the 2341/// placeholder type "void". This initializer list is called the 2342/// syntactic form of the initializer, and may contain C99 designated 2343/// initializers (represented as DesignatedInitExprs), initializations 2344/// of subobject members without explicit braces, and so on. Clients 2345/// interested in the original syntax of the initializer list should 2346/// use the syntactic form of the initializer list. 2347/// 2348/// After semantic analysis, the initializer list will represent the 2349/// semantic form of the initializer, where the initializations of all 2350/// subobjects are made explicit with nested InitListExpr nodes and 2351/// C99 designators have been eliminated by placing the designated 2352/// initializations into the subobject they initialize. Additionally, 2353/// any "holes" in the initialization, where no initializer has been 2354/// specified for a particular subobject, will be replaced with 2355/// implicitly-generated ImplicitValueInitExpr expressions that 2356/// value-initialize the subobjects. Note, however, that the 2357/// initializer lists may still have fewer initializers than there are 2358/// elements to initialize within the object. 2359/// 2360/// Given the semantic form of the initializer list, one can retrieve 2361/// the original syntactic form of that initializer list (if it 2362/// exists) using getSyntacticForm(). Since many initializer lists 2363/// have the same syntactic and semantic forms, getSyntacticForm() may 2364/// return NULL, indicating that the current initializer list also 2365/// serves as its syntactic form. 2366class InitListExpr : public Expr { 2367 // FIXME: Eliminate this vector in favor of ASTContext allocation 2368 std::vector<Stmt *> InitExprs; 2369 SourceLocation LBraceLoc, RBraceLoc; 2370 2371 /// Contains the initializer list that describes the syntactic form 2372 /// written in the source code. 2373 InitListExpr *SyntacticForm; 2374 2375 /// If this initializer list initializes a union, specifies which 2376 /// field within the union will be initialized. 2377 FieldDecl *UnionFieldInit; 2378 2379 /// Whether this initializer list originally had a GNU array-range 2380 /// designator in it. This is a temporary marker used by CodeGen. 2381 bool HadArrayRangeDesignator; 2382 2383public: 2384 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2385 SourceLocation rbraceloc); 2386 2387 /// \brief Build an empty initializer list. 2388 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2389 2390 unsigned getNumInits() const { return InitExprs.size(); } 2391 2392 const Expr* getInit(unsigned Init) const { 2393 assert(Init < getNumInits() && "Initializer access out of range!"); 2394 return cast_or_null<Expr>(InitExprs[Init]); 2395 } 2396 2397 Expr* getInit(unsigned Init) { 2398 assert(Init < getNumInits() && "Initializer access out of range!"); 2399 return cast_or_null<Expr>(InitExprs[Init]); 2400 } 2401 2402 void setInit(unsigned Init, Expr *expr) { 2403 assert(Init < getNumInits() && "Initializer access out of range!"); 2404 InitExprs[Init] = expr; 2405 } 2406 2407 /// \brief Reserve space for some number of initializers. 2408 void reserveInits(unsigned NumInits); 2409 2410 /// @brief Specify the number of initializers 2411 /// 2412 /// If there are more than @p NumInits initializers, the remaining 2413 /// initializers will be destroyed. If there are fewer than @p 2414 /// NumInits initializers, NULL expressions will be added for the 2415 /// unknown initializers. 2416 void resizeInits(ASTContext &Context, unsigned NumInits); 2417 2418 /// @brief Updates the initializer at index @p Init with the new 2419 /// expression @p expr, and returns the old expression at that 2420 /// location. 2421 /// 2422 /// When @p Init is out of range for this initializer list, the 2423 /// initializer list will be extended with NULL expressions to 2424 /// accomodate the new entry. 2425 Expr *updateInit(unsigned Init, Expr *expr); 2426 2427 /// \brief If this initializes a union, specifies which field in the 2428 /// union to initialize. 2429 /// 2430 /// Typically, this field is the first named field within the 2431 /// union. However, a designated initializer can specify the 2432 /// initialization of a different field within the union. 2433 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2434 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2435 2436 // Explicit InitListExpr's originate from source code (and have valid source 2437 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2438 bool isExplicit() { 2439 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2440 } 2441 2442 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2443 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2444 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2445 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2446 2447 /// @brief Retrieve the initializer list that describes the 2448 /// syntactic form of the initializer. 2449 /// 2450 /// 2451 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2452 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2453 2454 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2455 void sawArrayRangeDesignator(bool ARD = true) { 2456 HadArrayRangeDesignator = ARD; 2457 } 2458 2459 virtual SourceRange getSourceRange() const { 2460 return SourceRange(LBraceLoc, RBraceLoc); 2461 } 2462 static bool classof(const Stmt *T) { 2463 return T->getStmtClass() == InitListExprClass; 2464 } 2465 static bool classof(const InitListExpr *) { return true; } 2466 2467 // Iterators 2468 virtual child_iterator child_begin(); 2469 virtual child_iterator child_end(); 2470 2471 typedef std::vector<Stmt *>::iterator iterator; 2472 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2473 2474 iterator begin() { return InitExprs.begin(); } 2475 iterator end() { return InitExprs.end(); } 2476 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2477 reverse_iterator rend() { return InitExprs.rend(); } 2478}; 2479 2480/// @brief Represents a C99 designated initializer expression. 2481/// 2482/// A designated initializer expression (C99 6.7.8) contains one or 2483/// more designators (which can be field designators, array 2484/// designators, or GNU array-range designators) followed by an 2485/// expression that initializes the field or element(s) that the 2486/// designators refer to. For example, given: 2487/// 2488/// @code 2489/// struct point { 2490/// double x; 2491/// double y; 2492/// }; 2493/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2494/// @endcode 2495/// 2496/// The InitListExpr contains three DesignatedInitExprs, the first of 2497/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2498/// designators, one array designator for @c [2] followed by one field 2499/// designator for @c .y. The initalization expression will be 1.0. 2500class DesignatedInitExpr : public Expr { 2501public: 2502 /// \brief Forward declaration of the Designator class. 2503 class Designator; 2504 2505private: 2506 /// The location of the '=' or ':' prior to the actual initializer 2507 /// expression. 2508 SourceLocation EqualOrColonLoc; 2509 2510 /// Whether this designated initializer used the GNU deprecated 2511 /// syntax rather than the C99 '=' syntax. 2512 bool GNUSyntax : 1; 2513 2514 /// The number of designators in this initializer expression. 2515 unsigned NumDesignators : 15; 2516 2517 /// \brief The designators in this designated initialization 2518 /// expression. 2519 Designator *Designators; 2520 2521 /// The number of subexpressions of this initializer expression, 2522 /// which contains both the initializer and any additional 2523 /// expressions used by array and array-range designators. 2524 unsigned NumSubExprs : 16; 2525 2526 2527 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2528 const Designator *Designators, 2529 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2530 Expr **IndexExprs, unsigned NumIndexExprs, 2531 Expr *Init); 2532 2533 explicit DesignatedInitExpr(unsigned NumSubExprs) 2534 : Expr(DesignatedInitExprClass, EmptyShell()), 2535 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2536 2537protected: 2538 virtual void DoDestroy(ASTContext &C); 2539 2540public: 2541 /// A field designator, e.g., ".x". 2542 struct FieldDesignator { 2543 /// Refers to the field that is being initialized. The low bit 2544 /// of this field determines whether this is actually a pointer 2545 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2546 /// initially constructed, a field designator will store an 2547 /// IdentifierInfo*. After semantic analysis has resolved that 2548 /// name, the field designator will instead store a FieldDecl*. 2549 uintptr_t NameOrField; 2550 2551 /// The location of the '.' in the designated initializer. 2552 unsigned DotLoc; 2553 2554 /// The location of the field name in the designated initializer. 2555 unsigned FieldLoc; 2556 }; 2557 2558 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2559 struct ArrayOrRangeDesignator { 2560 /// Location of the first index expression within the designated 2561 /// initializer expression's list of subexpressions. 2562 unsigned Index; 2563 /// The location of the '[' starting the array range designator. 2564 unsigned LBracketLoc; 2565 /// The location of the ellipsis separating the start and end 2566 /// indices. Only valid for GNU array-range designators. 2567 unsigned EllipsisLoc; 2568 /// The location of the ']' terminating the array range designator. 2569 unsigned RBracketLoc; 2570 }; 2571 2572 /// @brief Represents a single C99 designator. 2573 /// 2574 /// @todo This class is infuriatingly similar to clang::Designator, 2575 /// but minor differences (storing indices vs. storing pointers) 2576 /// keep us from reusing it. Try harder, later, to rectify these 2577 /// differences. 2578 class Designator { 2579 /// @brief The kind of designator this describes. 2580 enum { 2581 FieldDesignator, 2582 ArrayDesignator, 2583 ArrayRangeDesignator 2584 } Kind; 2585 2586 union { 2587 /// A field designator, e.g., ".x". 2588 struct FieldDesignator Field; 2589 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2590 struct ArrayOrRangeDesignator ArrayOrRange; 2591 }; 2592 friend class DesignatedInitExpr; 2593 2594 public: 2595 Designator() {} 2596 2597 /// @brief Initializes a field designator. 2598 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2599 SourceLocation FieldLoc) 2600 : Kind(FieldDesignator) { 2601 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2602 Field.DotLoc = DotLoc.getRawEncoding(); 2603 Field.FieldLoc = FieldLoc.getRawEncoding(); 2604 } 2605 2606 /// @brief Initializes an array designator. 2607 Designator(unsigned Index, SourceLocation LBracketLoc, 2608 SourceLocation RBracketLoc) 2609 : Kind(ArrayDesignator) { 2610 ArrayOrRange.Index = Index; 2611 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2612 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2613 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2614 } 2615 2616 /// @brief Initializes a GNU array-range designator. 2617 Designator(unsigned Index, SourceLocation LBracketLoc, 2618 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2619 : Kind(ArrayRangeDesignator) { 2620 ArrayOrRange.Index = Index; 2621 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2622 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2623 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2624 } 2625 2626 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2627 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2628 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2629 2630 IdentifierInfo * getFieldName(); 2631 2632 FieldDecl *getField() { 2633 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2634 if (Field.NameOrField & 0x01) 2635 return 0; 2636 else 2637 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2638 } 2639 2640 void setField(FieldDecl *FD) { 2641 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2642 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2643 } 2644 2645 SourceLocation getDotLoc() const { 2646 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2647 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2648 } 2649 2650 SourceLocation getFieldLoc() const { 2651 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2652 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2653 } 2654 2655 SourceLocation getLBracketLoc() const { 2656 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2657 "Only valid on an array or array-range designator"); 2658 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2659 } 2660 2661 SourceLocation getRBracketLoc() const { 2662 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2663 "Only valid on an array or array-range designator"); 2664 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2665 } 2666 2667 SourceLocation getEllipsisLoc() const { 2668 assert(Kind == ArrayRangeDesignator && 2669 "Only valid on an array-range designator"); 2670 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2671 } 2672 2673 unsigned getFirstExprIndex() const { 2674 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2675 "Only valid on an array or array-range designator"); 2676 return ArrayOrRange.Index; 2677 } 2678 2679 SourceLocation getStartLocation() const { 2680 if (Kind == FieldDesignator) 2681 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2682 else 2683 return getLBracketLoc(); 2684 } 2685 }; 2686 2687 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2688 unsigned NumDesignators, 2689 Expr **IndexExprs, unsigned NumIndexExprs, 2690 SourceLocation EqualOrColonLoc, 2691 bool GNUSyntax, Expr *Init); 2692 2693 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2694 2695 /// @brief Returns the number of designators in this initializer. 2696 unsigned size() const { return NumDesignators; } 2697 2698 // Iterator access to the designators. 2699 typedef Designator* designators_iterator; 2700 designators_iterator designators_begin() { return Designators; } 2701 designators_iterator designators_end() { 2702 return Designators + NumDesignators; 2703 } 2704 2705 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2706 2707 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2708 2709 Expr *getArrayIndex(const Designator& D); 2710 Expr *getArrayRangeStart(const Designator& D); 2711 Expr *getArrayRangeEnd(const Designator& D); 2712 2713 /// @brief Retrieve the location of the '=' that precedes the 2714 /// initializer value itself, if present. 2715 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2716 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2717 2718 /// @brief Determines whether this designated initializer used the 2719 /// deprecated GNU syntax for designated initializers. 2720 bool usesGNUSyntax() const { return GNUSyntax; } 2721 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2722 2723 /// @brief Retrieve the initializer value. 2724 Expr *getInit() const { 2725 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2726 } 2727 2728 void setInit(Expr *init) { 2729 *child_begin() = init; 2730 } 2731 2732 /// \brief Retrieve the total number of subexpressions in this 2733 /// designated initializer expression, including the actual 2734 /// initialized value and any expressions that occur within array 2735 /// and array-range designators. 2736 unsigned getNumSubExprs() const { return NumSubExprs; } 2737 2738 Expr *getSubExpr(unsigned Idx) { 2739 assert(Idx < NumSubExprs && "Subscript out of range"); 2740 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2741 Ptr += sizeof(DesignatedInitExpr); 2742 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2743 } 2744 2745 void setSubExpr(unsigned Idx, Expr *E) { 2746 assert(Idx < NumSubExprs && "Subscript out of range"); 2747 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2748 Ptr += sizeof(DesignatedInitExpr); 2749 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2750 } 2751 2752 /// \brief Replaces the designator at index @p Idx with the series 2753 /// of designators in [First, Last). 2754 void ExpandDesignator(unsigned Idx, const Designator *First, 2755 const Designator *Last); 2756 2757 virtual SourceRange getSourceRange() const; 2758 2759 static bool classof(const Stmt *T) { 2760 return T->getStmtClass() == DesignatedInitExprClass; 2761 } 2762 static bool classof(const DesignatedInitExpr *) { return true; } 2763 2764 // Iterators 2765 virtual child_iterator child_begin(); 2766 virtual child_iterator child_end(); 2767}; 2768 2769/// \brief Represents an implicitly-generated value initialization of 2770/// an object of a given type. 2771/// 2772/// Implicit value initializations occur within semantic initializer 2773/// list expressions (InitListExpr) as placeholders for subobject 2774/// initializations not explicitly specified by the user. 2775/// 2776/// \see InitListExpr 2777class ImplicitValueInitExpr : public Expr { 2778public: 2779 explicit ImplicitValueInitExpr(QualType ty) 2780 : Expr(ImplicitValueInitExprClass, ty) { } 2781 2782 /// \brief Construct an empty implicit value initialization. 2783 explicit ImplicitValueInitExpr(EmptyShell Empty) 2784 : Expr(ImplicitValueInitExprClass, Empty) { } 2785 2786 static bool classof(const Stmt *T) { 2787 return T->getStmtClass() == ImplicitValueInitExprClass; 2788 } 2789 static bool classof(const ImplicitValueInitExpr *) { return true; } 2790 2791 virtual SourceRange getSourceRange() const { 2792 return SourceRange(); 2793 } 2794 2795 // Iterators 2796 virtual child_iterator child_begin(); 2797 virtual child_iterator child_end(); 2798}; 2799 2800 2801class ParenListExpr : public Expr { 2802 Stmt **Exprs; 2803 unsigned NumExprs; 2804 SourceLocation LParenLoc, RParenLoc; 2805 2806protected: 2807 virtual void DoDestroy(ASTContext& C); 2808 2809public: 2810 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2811 unsigned numexprs, SourceLocation rparenloc); 2812 2813 ~ParenListExpr() {} 2814 2815 /// \brief Build an empty paren list. 2816 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2817 2818 unsigned getNumExprs() const { return NumExprs; } 2819 2820 const Expr* getExpr(unsigned Init) const { 2821 assert(Init < getNumExprs() && "Initializer access out of range!"); 2822 return cast_or_null<Expr>(Exprs[Init]); 2823 } 2824 2825 Expr* getExpr(unsigned Init) { 2826 assert(Init < getNumExprs() && "Initializer access out of range!"); 2827 return cast_or_null<Expr>(Exprs[Init]); 2828 } 2829 2830 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2831 2832 SourceLocation getLParenLoc() const { return LParenLoc; } 2833 SourceLocation getRParenLoc() const { return RParenLoc; } 2834 2835 virtual SourceRange getSourceRange() const { 2836 return SourceRange(LParenLoc, RParenLoc); 2837 } 2838 static bool classof(const Stmt *T) { 2839 return T->getStmtClass() == ParenListExprClass; 2840 } 2841 static bool classof(const ParenListExpr *) { return true; } 2842 2843 // Iterators 2844 virtual child_iterator child_begin(); 2845 virtual child_iterator child_end(); 2846}; 2847 2848 2849//===----------------------------------------------------------------------===// 2850// Clang Extensions 2851//===----------------------------------------------------------------------===// 2852 2853 2854/// ExtVectorElementExpr - This represents access to specific elements of a 2855/// vector, and may occur on the left hand side or right hand side. For example 2856/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2857/// 2858/// Note that the base may have either vector or pointer to vector type, just 2859/// like a struct field reference. 2860/// 2861class ExtVectorElementExpr : public Expr { 2862 Stmt *Base; 2863 IdentifierInfo *Accessor; 2864 SourceLocation AccessorLoc; 2865public: 2866 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2867 SourceLocation loc) 2868 : Expr(ExtVectorElementExprClass, ty), 2869 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2870 2871 /// \brief Build an empty vector element expression. 2872 explicit ExtVectorElementExpr(EmptyShell Empty) 2873 : Expr(ExtVectorElementExprClass, Empty) { } 2874 2875 const Expr *getBase() const { return cast<Expr>(Base); } 2876 Expr *getBase() { return cast<Expr>(Base); } 2877 void setBase(Expr *E) { Base = E; } 2878 2879 IdentifierInfo &getAccessor() const { return *Accessor; } 2880 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2881 2882 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2883 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2884 2885 /// getNumElements - Get the number of components being selected. 2886 unsigned getNumElements() const; 2887 2888 /// containsDuplicateElements - Return true if any element access is 2889 /// repeated. 2890 bool containsDuplicateElements() const; 2891 2892 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2893 /// aggregate Constant of ConstantInt(s). 2894 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2895 2896 virtual SourceRange getSourceRange() const { 2897 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2898 } 2899 2900 /// isArrow - Return true if the base expression is a pointer to vector, 2901 /// return false if the base expression is a vector. 2902 bool isArrow() const; 2903 2904 static bool classof(const Stmt *T) { 2905 return T->getStmtClass() == ExtVectorElementExprClass; 2906 } 2907 static bool classof(const ExtVectorElementExpr *) { return true; } 2908 2909 // Iterators 2910 virtual child_iterator child_begin(); 2911 virtual child_iterator child_end(); 2912}; 2913 2914 2915/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2916/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2917class BlockExpr : public Expr { 2918protected: 2919 BlockDecl *TheBlock; 2920 bool HasBlockDeclRefExprs; 2921public: 2922 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2923 : Expr(BlockExprClass, ty), 2924 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2925 2926 /// \brief Build an empty block expression. 2927 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2928 2929 const BlockDecl *getBlockDecl() const { return TheBlock; } 2930 BlockDecl *getBlockDecl() { return TheBlock; } 2931 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2932 2933 // Convenience functions for probing the underlying BlockDecl. 2934 SourceLocation getCaretLocation() const; 2935 const Stmt *getBody() const; 2936 Stmt *getBody(); 2937 2938 virtual SourceRange getSourceRange() const { 2939 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2940 } 2941 2942 /// getFunctionType - Return the underlying function type for this block. 2943 const FunctionType *getFunctionType() const; 2944 2945 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2946 /// inside of the block that reference values outside the block. 2947 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2948 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2949 2950 static bool classof(const Stmt *T) { 2951 return T->getStmtClass() == BlockExprClass; 2952 } 2953 static bool classof(const BlockExpr *) { return true; } 2954 2955 // Iterators 2956 virtual child_iterator child_begin(); 2957 virtual child_iterator child_end(); 2958}; 2959 2960/// BlockDeclRefExpr - A reference to a declared variable, function, 2961/// enum, etc. 2962class BlockDeclRefExpr : public Expr { 2963 ValueDecl *D; 2964 SourceLocation Loc; 2965 bool IsByRef : 1; 2966 bool ConstQualAdded : 1; 2967public: 2968 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2969 bool constAdded = false) : 2970 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2971 ConstQualAdded(constAdded) {} 2972 2973 // \brief Build an empty reference to a declared variable in a 2974 // block. 2975 explicit BlockDeclRefExpr(EmptyShell Empty) 2976 : Expr(BlockDeclRefExprClass, Empty) { } 2977 2978 ValueDecl *getDecl() { return D; } 2979 const ValueDecl *getDecl() const { return D; } 2980 void setDecl(ValueDecl *VD) { D = VD; } 2981 2982 SourceLocation getLocation() const { return Loc; } 2983 void setLocation(SourceLocation L) { Loc = L; } 2984 2985 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2986 2987 bool isByRef() const { return IsByRef; } 2988 void setByRef(bool BR) { IsByRef = BR; } 2989 2990 bool isConstQualAdded() const { return ConstQualAdded; } 2991 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2992 2993 static bool classof(const Stmt *T) { 2994 return T->getStmtClass() == BlockDeclRefExprClass; 2995 } 2996 static bool classof(const BlockDeclRefExpr *) { return true; } 2997 2998 // Iterators 2999 virtual child_iterator child_begin(); 3000 virtual child_iterator child_end(); 3001}; 3002 3003} // end namespace clang 3004 3005#endif 3006