Expr.h revision 2514a309204341798f96912ce7a90841bea59727
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 LV_SubObjCPropertySetting 161 }; 162 isLvalueResult isLvalue(ASTContext &Ctx) const; 163 164 // Same as above, but excluding checks for non-object and void types in C 165 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 166 167 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 168 /// does not have an incomplete type, does not have a const-qualified type, 169 /// and if it is a structure or union, does not have any member (including, 170 /// recursively, any member or element of all contained aggregates or unions) 171 /// with a const-qualified type. 172 /// 173 /// \param Loc [in] [out] - A source location which *may* be filled 174 /// in with the location of the expression making this a 175 /// non-modifiable lvalue, if specified. 176 enum isModifiableLvalueResult { 177 MLV_Valid, 178 MLV_NotObjectType, 179 MLV_IncompleteVoidType, 180 MLV_DuplicateVectorComponents, 181 MLV_InvalidExpression, 182 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 183 MLV_IncompleteType, 184 MLV_ConstQualified, 185 MLV_ArrayType, 186 MLV_NotBlockQualified, 187 MLV_ReadonlyProperty, 188 MLV_NoSetterProperty, 189 MLV_MemberFunction, 190 MLV_SubObjCPropertySetting 191 }; 192 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 193 SourceLocation *Loc = 0) const; 194 195 /// \brief If this expression refers to a bit-field, retrieve the 196 /// declaration of that bit-field. 197 FieldDecl *getBitField(); 198 199 const FieldDecl *getBitField() const { 200 return const_cast<Expr*>(this)->getBitField(); 201 } 202 203 /// isIntegerConstantExpr - Return true if this expression is a valid integer 204 /// constant expression, and, if so, return its value in Result. If not a 205 /// valid i-c-e, return false and fill in Loc (if specified) with the location 206 /// of the invalid expression. 207 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 208 SourceLocation *Loc = 0, 209 bool isEvaluated = true) const; 210 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 211 llvm::APSInt X; 212 return isIntegerConstantExpr(X, Ctx, Loc); 213 } 214 /// isConstantInitializer - Returns true if this expression is a constant 215 /// initializer, which can be emitted at compile-time. 216 bool isConstantInitializer(ASTContext &Ctx) const; 217 218 /// EvalResult is a struct with detailed info about an evaluated expression. 219 struct EvalResult { 220 /// Val - This is the value the expression can be folded to. 221 APValue Val; 222 223 /// HasSideEffects - Whether the evaluated expression has side effects. 224 /// For example, (f() && 0) can be folded, but it still has side effects. 225 bool HasSideEffects; 226 227 /// Diag - If the expression is unfoldable, then Diag contains a note 228 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 229 /// position for the error, and DiagExpr is the expression that caused 230 /// the error. 231 /// If the expression is foldable, but not an integer constant expression, 232 /// Diag contains a note diagnostic that describes why it isn't an integer 233 /// constant expression. If the expression *is* an integer constant 234 /// expression, then Diag will be zero. 235 unsigned Diag; 236 const Expr *DiagExpr; 237 SourceLocation DiagLoc; 238 239 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 240 }; 241 242 /// Evaluate - Return true if this is a constant which we can fold using 243 /// any crazy technique (that has nothing to do with language standards) that 244 /// we want to. If this function returns true, it returns the folded constant 245 /// in Result. 246 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 247 248 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 249 /// stack based objects. 250 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 251 252 /// isEvaluatable - Call Evaluate to see if this expression can be constant 253 /// folded, but discard the result. 254 bool isEvaluatable(ASTContext &Ctx) const; 255 256 /// HasSideEffects - This routine returns true for all those expressions 257 /// which must be evaluated each time and must not be optimization away 258 /// or evaluated at compile time. Example is a function call, volatile 259 /// variable read. 260 bool HasSideEffects(ASTContext &Ctx) const; 261 262 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 263 /// must be called on an expression that constant folds to an integer. 264 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 265 266 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 267 /// with link time known address. 268 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 269 270 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 271 /// also succeeds on stack based, immutable address lvalues. 272 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 273 274 /// \brief Enumeration used to describe how \c isNullPointerConstant() 275 /// should cope with value-dependent expressions. 276 enum NullPointerConstantValueDependence { 277 /// \brief Specifies that the expression should never be value-dependent. 278 NPC_NeverValueDependent = 0, 279 280 /// \brief Specifies that a value-dependent expression of integral or 281 /// dependent type should be considered a null pointer constant. 282 NPC_ValueDependentIsNull, 283 284 /// \brief Specifies that a value-dependent expression should be considered 285 /// to never be a null pointer constant. 286 NPC_ValueDependentIsNotNull 287 }; 288 289 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 290 /// integer constant expression with the value zero, or if this is one that is 291 /// cast to void*. 292 bool isNullPointerConstant(ASTContext &Ctx, 293 NullPointerConstantValueDependence NPC) const; 294 295 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 296 /// write barrier. 297 bool isOBJCGCCandidate(ASTContext &Ctx) const; 298 299 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 300 /// its subexpression. If that subexpression is also a ParenExpr, 301 /// then this method recursively returns its subexpression, and so forth. 302 /// Otherwise, the method returns the current Expr. 303 Expr* IgnoreParens(); 304 305 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 306 /// or CastExprs, returning their operand. 307 Expr *IgnoreParenCasts(); 308 309 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 310 /// value (including ptr->int casts of the same size). Strip off any 311 /// ParenExpr or CastExprs, returning their operand. 312 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 313 314 /// \brief Determine whether this expression is a default function argument. 315 /// 316 /// Default arguments are implicitly generated in the abstract syntax tree 317 /// by semantic analysis for function calls, object constructions, etc. in 318 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 319 /// this routine also looks through any implicit casts to determine whether 320 /// the expression is a default argument. 321 bool isDefaultArgument() const; 322 323 const Expr* IgnoreParens() const { 324 return const_cast<Expr*>(this)->IgnoreParens(); 325 } 326 const Expr *IgnoreParenCasts() const { 327 return const_cast<Expr*>(this)->IgnoreParenCasts(); 328 } 329 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 330 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 331 } 332 333 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 334 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 335 336 static bool classof(const Stmt *T) { 337 return T->getStmtClass() >= firstExprConstant && 338 T->getStmtClass() <= lastExprConstant; 339 } 340 static bool classof(const Expr *) { return true; } 341}; 342 343 344//===----------------------------------------------------------------------===// 345// Primary Expressions. 346//===----------------------------------------------------------------------===// 347 348/// \brief Represents the qualifier that may precede a C++ name, e.g., the 349/// "std::" in "std::sort". 350struct NameQualifier { 351 /// \brief The nested name specifier. 352 NestedNameSpecifier *NNS; 353 354 /// \brief The source range covered by the nested name specifier. 355 SourceRange Range; 356}; 357 358/// \brief Represents an explicit template argument list in C++, e.g., 359/// the "<int>" in "sort<int>". 360struct ExplicitTemplateArgumentList { 361 /// \brief The source location of the left angle bracket ('<'); 362 SourceLocation LAngleLoc; 363 364 /// \brief The source location of the right angle bracket ('>'); 365 SourceLocation RAngleLoc; 366 367 /// \brief The number of template arguments in TemplateArgs. 368 /// The actual template arguments (if any) are stored after the 369 /// ExplicitTemplateArgumentList structure. 370 unsigned NumTemplateArgs; 371 372 /// \brief Retrieve the template arguments 373 TemplateArgumentLoc *getTemplateArgs() { 374 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 375 } 376 377 /// \brief Retrieve the template arguments 378 const TemplateArgumentLoc *getTemplateArgs() const { 379 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 380 } 381 382 void initializeFrom(const TemplateArgumentListInfo &List); 383 void copyInto(TemplateArgumentListInfo &List) const; 384 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 385}; 386 387/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 388/// enum, etc. 389class DeclRefExpr : public Expr { 390 enum { 391 // Flag on DecoratedD that specifies when this declaration reference 392 // expression has a C++ nested-name-specifier. 393 HasQualifierFlag = 0x01, 394 // Flag on DecoratedD that specifies when this declaration reference 395 // expression has an explicit C++ template argument list. 396 HasExplicitTemplateArgumentListFlag = 0x02 397 }; 398 399 // DecoratedD - The declaration that we are referencing, plus two bits to 400 // indicate whether (1) the declaration's name was explicitly qualified and 401 // (2) the declaration's name was followed by an explicit template 402 // argument list. 403 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 404 405 // Loc - The location of the declaration name itself. 406 SourceLocation Loc; 407 408 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 409 NameQualifier *getNameQualifier() { 410 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 411 return 0; 412 413 return reinterpret_cast<NameQualifier *> (this + 1); 414 } 415 416 /// \brief Retrieve the qualifier that preceded the member name, if any. 417 const NameQualifier *getNameQualifier() const { 418 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 419 } 420 421 /// \brief Retrieve the explicit template argument list that followed the 422 /// member template name, if any. 423 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 424 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 425 return 0; 426 427 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 428 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 429 430 return reinterpret_cast<ExplicitTemplateArgumentList *>( 431 getNameQualifier() + 1); 432 } 433 434 /// \brief Retrieve the explicit template argument list that followed the 435 /// member template name, if any. 436 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 437 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 438 } 439 440 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 441 ValueDecl *D, SourceLocation NameLoc, 442 const TemplateArgumentListInfo *TemplateArgs, 443 QualType T); 444 445protected: 446 /// \brief Computes the type- and value-dependence flags for this 447 /// declaration reference expression. 448 void computeDependence(); 449 450 DeclRefExpr(StmtClass SC, ValueDecl *d, QualType t, SourceLocation l) : 451 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 452 computeDependence(); 453 } 454 455public: 456 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 457 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 458 computeDependence(); 459 } 460 461 /// \brief Construct an empty declaration reference expression. 462 explicit DeclRefExpr(EmptyShell Empty) 463 : Expr(DeclRefExprClass, Empty) { } 464 465 static DeclRefExpr *Create(ASTContext &Context, 466 NestedNameSpecifier *Qualifier, 467 SourceRange QualifierRange, 468 ValueDecl *D, 469 SourceLocation NameLoc, 470 QualType T, 471 const TemplateArgumentListInfo *TemplateArgs = 0); 472 473 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 474 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 475 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 476 477 SourceLocation getLocation() const { return Loc; } 478 void setLocation(SourceLocation L) { Loc = L; } 479 virtual SourceRange getSourceRange() const; 480 481 /// \brief Determine whether this declaration reference was preceded by a 482 /// C++ nested-name-specifier, e.g., \c N::foo. 483 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 484 485 /// \brief If the name was qualified, retrieves the source range of 486 /// the nested-name-specifier that precedes the name. Otherwise, 487 /// returns an empty source range. 488 SourceRange getQualifierRange() const { 489 if (!hasQualifier()) 490 return SourceRange(); 491 492 return getNameQualifier()->Range; 493 } 494 495 /// \brief If the name was qualified, retrieves the nested-name-specifier 496 /// that precedes the name. Otherwise, returns NULL. 497 NestedNameSpecifier *getQualifier() const { 498 if (!hasQualifier()) 499 return 0; 500 501 return getNameQualifier()->NNS; 502 } 503 504 /// \brief Determines whether this member expression actually had a C++ 505 /// template argument list explicitly specified, e.g., x.f<int>. 506 bool hasExplicitTemplateArgumentList() const { 507 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 508 } 509 510 /// \brief Copies the template arguments (if present) into the given 511 /// structure. 512 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 513 if (hasExplicitTemplateArgumentList()) 514 getExplicitTemplateArgumentList()->copyInto(List); 515 } 516 517 /// \brief Retrieve the location of the left angle bracket following the 518 /// member name ('<'), if any. 519 SourceLocation getLAngleLoc() const { 520 if (!hasExplicitTemplateArgumentList()) 521 return SourceLocation(); 522 523 return getExplicitTemplateArgumentList()->LAngleLoc; 524 } 525 526 /// \brief Retrieve the template arguments provided as part of this 527 /// template-id. 528 const TemplateArgumentLoc *getTemplateArgs() const { 529 if (!hasExplicitTemplateArgumentList()) 530 return 0; 531 532 return getExplicitTemplateArgumentList()->getTemplateArgs(); 533 } 534 535 /// \brief Retrieve the number of template arguments provided as part of this 536 /// template-id. 537 unsigned getNumTemplateArgs() const { 538 if (!hasExplicitTemplateArgumentList()) 539 return 0; 540 541 return getExplicitTemplateArgumentList()->NumTemplateArgs; 542 } 543 544 /// \brief Retrieve the location of the right angle bracket following the 545 /// template arguments ('>'). 546 SourceLocation getRAngleLoc() const { 547 if (!hasExplicitTemplateArgumentList()) 548 return SourceLocation(); 549 550 return getExplicitTemplateArgumentList()->RAngleLoc; 551 } 552 553 static bool classof(const Stmt *T) { 554 return T->getStmtClass() == DeclRefExprClass; 555 } 556 static bool classof(const DeclRefExpr *) { return true; } 557 558 // Iterators 559 virtual child_iterator child_begin(); 560 virtual child_iterator child_end(); 561}; 562 563/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 564class PredefinedExpr : public Expr { 565public: 566 enum IdentType { 567 Func, 568 Function, 569 PrettyFunction 570 }; 571 572private: 573 SourceLocation Loc; 574 IdentType Type; 575public: 576 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 577 : Expr(PredefinedExprClass, type, type->isDependentType(), 578 type->isDependentType()), Loc(l), Type(IT) {} 579 580 /// \brief Construct an empty predefined expression. 581 explicit PredefinedExpr(EmptyShell Empty) 582 : Expr(PredefinedExprClass, Empty) { } 583 584 IdentType getIdentType() const { return Type; } 585 void setIdentType(IdentType IT) { Type = IT; } 586 587 SourceLocation getLocation() const { return Loc; } 588 void setLocation(SourceLocation L) { Loc = L; } 589 590 static std::string ComputeName(ASTContext &Context, IdentType IT, 591 const Decl *CurrentDecl); 592 593 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 594 595 static bool classof(const Stmt *T) { 596 return T->getStmtClass() == PredefinedExprClass; 597 } 598 static bool classof(const PredefinedExpr *) { return true; } 599 600 // Iterators 601 virtual child_iterator child_begin(); 602 virtual child_iterator child_end(); 603}; 604 605class IntegerLiteral : public Expr { 606 llvm::APInt Value; 607 SourceLocation Loc; 608public: 609 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 610 // or UnsignedLongLongTy 611 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 612 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 613 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 614 } 615 616 /// \brief Construct an empty integer literal. 617 explicit IntegerLiteral(EmptyShell Empty) 618 : Expr(IntegerLiteralClass, Empty) { } 619 620 const llvm::APInt &getValue() const { return Value; } 621 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 622 623 /// \brief Retrieve the location of the literal. 624 SourceLocation getLocation() const { return Loc; } 625 626 void setValue(const llvm::APInt &Val) { Value = Val; } 627 void setLocation(SourceLocation Location) { Loc = Location; } 628 629 static bool classof(const Stmt *T) { 630 return T->getStmtClass() == IntegerLiteralClass; 631 } 632 static bool classof(const IntegerLiteral *) { return true; } 633 634 // Iterators 635 virtual child_iterator child_begin(); 636 virtual child_iterator child_end(); 637}; 638 639class CharacterLiteral : public Expr { 640 unsigned Value; 641 SourceLocation Loc; 642 bool IsWide; 643public: 644 // type should be IntTy 645 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 646 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 647 } 648 649 /// \brief Construct an empty character literal. 650 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 651 652 SourceLocation getLocation() const { return Loc; } 653 bool isWide() const { return IsWide; } 654 655 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 656 657 unsigned getValue() const { return Value; } 658 659 void setLocation(SourceLocation Location) { Loc = Location; } 660 void setWide(bool W) { IsWide = W; } 661 void setValue(unsigned Val) { Value = Val; } 662 663 static bool classof(const Stmt *T) { 664 return T->getStmtClass() == CharacterLiteralClass; 665 } 666 static bool classof(const CharacterLiteral *) { return true; } 667 668 // Iterators 669 virtual child_iterator child_begin(); 670 virtual child_iterator child_end(); 671}; 672 673class FloatingLiteral : public Expr { 674 llvm::APFloat Value; 675 bool IsExact : 1; 676 SourceLocation Loc; 677public: 678 FloatingLiteral(const llvm::APFloat &V, bool isexact, 679 QualType Type, SourceLocation L) 680 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 681 682 /// \brief Construct an empty floating-point literal. 683 explicit FloatingLiteral(EmptyShell Empty) 684 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 685 686 const llvm::APFloat &getValue() const { return Value; } 687 void setValue(const llvm::APFloat &Val) { Value = Val; } 688 689 bool isExact() const { return IsExact; } 690 void setExact(bool E) { IsExact = E; } 691 692 /// getValueAsApproximateDouble - This returns the value as an inaccurate 693 /// double. Note that this may cause loss of precision, but is useful for 694 /// debugging dumps, etc. 695 double getValueAsApproximateDouble() const; 696 697 SourceLocation getLocation() const { return Loc; } 698 void setLocation(SourceLocation L) { Loc = L; } 699 700 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 701 702 static bool classof(const Stmt *T) { 703 return T->getStmtClass() == FloatingLiteralClass; 704 } 705 static bool classof(const FloatingLiteral *) { return true; } 706 707 // Iterators 708 virtual child_iterator child_begin(); 709 virtual child_iterator child_end(); 710}; 711 712/// ImaginaryLiteral - We support imaginary integer and floating point literals, 713/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 714/// IntegerLiteral classes. Instances of this class always have a Complex type 715/// whose element type matches the subexpression. 716/// 717class ImaginaryLiteral : public Expr { 718 Stmt *Val; 719public: 720 ImaginaryLiteral(Expr *val, QualType Ty) 721 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 722 723 /// \brief Build an empty imaginary literal. 724 explicit ImaginaryLiteral(EmptyShell Empty) 725 : Expr(ImaginaryLiteralClass, Empty) { } 726 727 const Expr *getSubExpr() const { return cast<Expr>(Val); } 728 Expr *getSubExpr() { return cast<Expr>(Val); } 729 void setSubExpr(Expr *E) { Val = E; } 730 731 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 732 static bool classof(const Stmt *T) { 733 return T->getStmtClass() == ImaginaryLiteralClass; 734 } 735 static bool classof(const ImaginaryLiteral *) { return true; } 736 737 // Iterators 738 virtual child_iterator child_begin(); 739 virtual child_iterator child_end(); 740}; 741 742/// StringLiteral - This represents a string literal expression, e.g. "foo" 743/// or L"bar" (wide strings). The actual string is returned by getStrData() 744/// is NOT null-terminated, and the length of the string is determined by 745/// calling getByteLength(). The C type for a string is always a 746/// ConstantArrayType. In C++, the char type is const qualified, in C it is 747/// not. 748/// 749/// Note that strings in C can be formed by concatenation of multiple string 750/// literal pptokens in translation phase #6. This keeps track of the locations 751/// of each of these pieces. 752/// 753/// Strings in C can also be truncated and extended by assigning into arrays, 754/// e.g. with constructs like: 755/// char X[2] = "foobar"; 756/// In this case, getByteLength() will return 6, but the string literal will 757/// have type "char[2]". 758class StringLiteral : public Expr { 759 const char *StrData; 760 unsigned ByteLength; 761 bool IsWide; 762 unsigned NumConcatenated; 763 SourceLocation TokLocs[1]; 764 765 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 766 767protected: 768 virtual void DoDestroy(ASTContext &C); 769 770public: 771 /// This is the "fully general" constructor that allows representation of 772 /// strings formed from multiple concatenated tokens. 773 static StringLiteral *Create(ASTContext &C, const char *StrData, 774 unsigned ByteLength, bool Wide, QualType Ty, 775 const SourceLocation *Loc, unsigned NumStrs); 776 777 /// Simple constructor for string literals made from one token. 778 static StringLiteral *Create(ASTContext &C, const char *StrData, 779 unsigned ByteLength, 780 bool Wide, QualType Ty, SourceLocation Loc) { 781 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 782 } 783 784 /// \brief Construct an empty string literal. 785 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 786 787 llvm::StringRef getString() const { 788 return llvm::StringRef(StrData, ByteLength); 789 } 790 // FIXME: These are deprecated, replace with StringRef. 791 const char *getStrData() const { return StrData; } 792 unsigned getByteLength() const { return ByteLength; } 793 794 /// \brief Sets the string data to the given string data. 795 void setString(ASTContext &C, llvm::StringRef Str); 796 797 bool isWide() const { return IsWide; } 798 void setWide(bool W) { IsWide = W; } 799 800 bool containsNonAsciiOrNull() const { 801 llvm::StringRef Str = getString(); 802 for (unsigned i = 0, e = Str.size(); i != e; ++i) 803 if (!isascii(Str[i]) || !Str[i]) 804 return true; 805 return false; 806 } 807 /// getNumConcatenated - Get the number of string literal tokens that were 808 /// concatenated in translation phase #6 to form this string literal. 809 unsigned getNumConcatenated() const { return NumConcatenated; } 810 811 SourceLocation getStrTokenLoc(unsigned TokNum) const { 812 assert(TokNum < NumConcatenated && "Invalid tok number"); 813 return TokLocs[TokNum]; 814 } 815 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 816 assert(TokNum < NumConcatenated && "Invalid tok number"); 817 TokLocs[TokNum] = L; 818 } 819 820 typedef const SourceLocation *tokloc_iterator; 821 tokloc_iterator tokloc_begin() const { return TokLocs; } 822 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 823 824 virtual SourceRange getSourceRange() const { 825 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 826 } 827 static bool classof(const Stmt *T) { 828 return T->getStmtClass() == StringLiteralClass; 829 } 830 static bool classof(const StringLiteral *) { return true; } 831 832 // Iterators 833 virtual child_iterator child_begin(); 834 virtual child_iterator child_end(); 835}; 836 837/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 838/// AST node is only formed if full location information is requested. 839class ParenExpr : public Expr { 840 SourceLocation L, R; 841 Stmt *Val; 842public: 843 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 844 : Expr(ParenExprClass, val->getType(), 845 val->isTypeDependent(), val->isValueDependent()), 846 L(l), R(r), Val(val) {} 847 848 /// \brief Construct an empty parenthesized expression. 849 explicit ParenExpr(EmptyShell Empty) 850 : Expr(ParenExprClass, Empty) { } 851 852 const Expr *getSubExpr() const { return cast<Expr>(Val); } 853 Expr *getSubExpr() { return cast<Expr>(Val); } 854 void setSubExpr(Expr *E) { Val = E; } 855 856 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 857 858 /// \brief Get the location of the left parentheses '('. 859 SourceLocation getLParen() const { return L; } 860 void setLParen(SourceLocation Loc) { L = Loc; } 861 862 /// \brief Get the location of the right parentheses ')'. 863 SourceLocation getRParen() const { return R; } 864 void setRParen(SourceLocation Loc) { R = Loc; } 865 866 static bool classof(const Stmt *T) { 867 return T->getStmtClass() == ParenExprClass; 868 } 869 static bool classof(const ParenExpr *) { return true; } 870 871 // Iterators 872 virtual child_iterator child_begin(); 873 virtual child_iterator child_end(); 874}; 875 876 877/// UnaryOperator - This represents the unary-expression's (except sizeof and 878/// alignof), the postinc/postdec operators from postfix-expression, and various 879/// extensions. 880/// 881/// Notes on various nodes: 882/// 883/// Real/Imag - These return the real/imag part of a complex operand. If 884/// applied to a non-complex value, the former returns its operand and the 885/// later returns zero in the type of the operand. 886/// 887/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 888/// subexpression is a compound literal with the various MemberExpr and 889/// ArraySubscriptExpr's applied to it. 890/// 891class UnaryOperator : public Expr { 892public: 893 // Note that additions to this should also update the StmtVisitor class. 894 enum Opcode { 895 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 896 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 897 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 898 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 899 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 900 Real, Imag, // "__real expr"/"__imag expr" Extension. 901 Extension, // __extension__ marker. 902 OffsetOf // __builtin_offsetof 903 }; 904private: 905 Stmt *Val; 906 Opcode Opc; 907 SourceLocation Loc; 908public: 909 910 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 911 : Expr(UnaryOperatorClass, type, 912 input->isTypeDependent() && opc != OffsetOf, 913 input->isValueDependent()), 914 Val(input), Opc(opc), Loc(l) {} 915 916 /// \brief Build an empty unary operator. 917 explicit UnaryOperator(EmptyShell Empty) 918 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 919 920 Opcode getOpcode() const { return Opc; } 921 void setOpcode(Opcode O) { Opc = O; } 922 923 Expr *getSubExpr() const { return cast<Expr>(Val); } 924 void setSubExpr(Expr *E) { Val = E; } 925 926 /// getOperatorLoc - Return the location of the operator. 927 SourceLocation getOperatorLoc() const { return Loc; } 928 void setOperatorLoc(SourceLocation L) { Loc = L; } 929 930 /// isPostfix - Return true if this is a postfix operation, like x++. 931 static bool isPostfix(Opcode Op) { 932 return Op == PostInc || Op == PostDec; 933 } 934 935 /// isPostfix - Return true if this is a prefix operation, like --x. 936 static bool isPrefix(Opcode Op) { 937 return Op == PreInc || Op == PreDec; 938 } 939 940 bool isPrefix() const { return isPrefix(Opc); } 941 bool isPostfix() const { return isPostfix(Opc); } 942 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 943 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 944 bool isOffsetOfOp() const { return Opc == OffsetOf; } 945 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 946 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 947 948 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 949 /// corresponds to, e.g. "sizeof" or "[pre]++" 950 static const char *getOpcodeStr(Opcode Op); 951 952 /// \brief Retrieve the unary opcode that corresponds to the given 953 /// overloaded operator. 954 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 955 956 /// \brief Retrieve the overloaded operator kind that corresponds to 957 /// the given unary opcode. 958 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 959 960 virtual SourceRange getSourceRange() const { 961 if (isPostfix()) 962 return SourceRange(Val->getLocStart(), Loc); 963 else 964 return SourceRange(Loc, Val->getLocEnd()); 965 } 966 virtual SourceLocation getExprLoc() const { return Loc; } 967 968 static bool classof(const Stmt *T) { 969 return T->getStmtClass() == UnaryOperatorClass; 970 } 971 static bool classof(const UnaryOperator *) { return true; } 972 973 // Iterators 974 virtual child_iterator child_begin(); 975 virtual child_iterator child_end(); 976}; 977 978/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 979/// types and expressions. 980class SizeOfAlignOfExpr : public Expr { 981 bool isSizeof : 1; // true if sizeof, false if alignof. 982 bool isType : 1; // true if operand is a type, false if an expression 983 union { 984 TypeSourceInfo *Ty; 985 Stmt *Ex; 986 } Argument; 987 SourceLocation OpLoc, RParenLoc; 988 989protected: 990 virtual void DoDestroy(ASTContext& C); 991 992public: 993 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 994 QualType resultType, SourceLocation op, 995 SourceLocation rp) : 996 Expr(SizeOfAlignOfExprClass, resultType, 997 false, // Never type-dependent (C++ [temp.dep.expr]p3). 998 // Value-dependent if the argument is type-dependent. 999 TInfo->getType()->isDependentType()), 1000 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1001 Argument.Ty = TInfo; 1002 } 1003 1004 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1005 QualType resultType, SourceLocation op, 1006 SourceLocation rp) : 1007 Expr(SizeOfAlignOfExprClass, resultType, 1008 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1009 // Value-dependent if the argument is type-dependent. 1010 E->isTypeDependent()), 1011 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1012 Argument.Ex = E; 1013 } 1014 1015 /// \brief Construct an empty sizeof/alignof expression. 1016 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1017 : Expr(SizeOfAlignOfExprClass, Empty) { } 1018 1019 bool isSizeOf() const { return isSizeof; } 1020 void setSizeof(bool S) { isSizeof = S; } 1021 1022 bool isArgumentType() const { return isType; } 1023 QualType getArgumentType() const { 1024 return getArgumentTypeInfo()->getType(); 1025 } 1026 TypeSourceInfo *getArgumentTypeInfo() const { 1027 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1028 return Argument.Ty; 1029 } 1030 Expr *getArgumentExpr() { 1031 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1032 return static_cast<Expr*>(Argument.Ex); 1033 } 1034 const Expr *getArgumentExpr() const { 1035 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1036 } 1037 1038 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1039 void setArgument(TypeSourceInfo *TInfo) { 1040 Argument.Ty = TInfo; 1041 isType = true; 1042 } 1043 1044 /// Gets the argument type, or the type of the argument expression, whichever 1045 /// is appropriate. 1046 QualType getTypeOfArgument() const { 1047 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1048 } 1049 1050 SourceLocation getOperatorLoc() const { return OpLoc; } 1051 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1052 1053 SourceLocation getRParenLoc() const { return RParenLoc; } 1054 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1055 1056 virtual SourceRange getSourceRange() const { 1057 return SourceRange(OpLoc, RParenLoc); 1058 } 1059 1060 static bool classof(const Stmt *T) { 1061 return T->getStmtClass() == SizeOfAlignOfExprClass; 1062 } 1063 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1064 1065 // Iterators 1066 virtual child_iterator child_begin(); 1067 virtual child_iterator child_end(); 1068}; 1069 1070//===----------------------------------------------------------------------===// 1071// Postfix Operators. 1072//===----------------------------------------------------------------------===// 1073 1074/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1075class ArraySubscriptExpr : public Expr { 1076 enum { LHS, RHS, END_EXPR=2 }; 1077 Stmt* SubExprs[END_EXPR]; 1078 SourceLocation RBracketLoc; 1079public: 1080 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1081 SourceLocation rbracketloc) 1082 : Expr(ArraySubscriptExprClass, t, 1083 lhs->isTypeDependent() || rhs->isTypeDependent(), 1084 lhs->isValueDependent() || rhs->isValueDependent()), 1085 RBracketLoc(rbracketloc) { 1086 SubExprs[LHS] = lhs; 1087 SubExprs[RHS] = rhs; 1088 } 1089 1090 /// \brief Create an empty array subscript expression. 1091 explicit ArraySubscriptExpr(EmptyShell Shell) 1092 : Expr(ArraySubscriptExprClass, Shell) { } 1093 1094 /// An array access can be written A[4] or 4[A] (both are equivalent). 1095 /// - getBase() and getIdx() always present the normalized view: A[4]. 1096 /// In this case getBase() returns "A" and getIdx() returns "4". 1097 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1098 /// 4[A] getLHS() returns "4". 1099 /// Note: Because vector element access is also written A[4] we must 1100 /// predicate the format conversion in getBase and getIdx only on the 1101 /// the type of the RHS, as it is possible for the LHS to be a vector of 1102 /// integer type 1103 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1104 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1105 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1106 1107 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1108 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1109 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1110 1111 Expr *getBase() { 1112 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1113 } 1114 1115 const Expr *getBase() const { 1116 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1117 } 1118 1119 Expr *getIdx() { 1120 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1121 } 1122 1123 const Expr *getIdx() const { 1124 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1125 } 1126 1127 virtual SourceRange getSourceRange() const { 1128 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1129 } 1130 1131 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1132 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1133 1134 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1135 1136 static bool classof(const Stmt *T) { 1137 return T->getStmtClass() == ArraySubscriptExprClass; 1138 } 1139 static bool classof(const ArraySubscriptExpr *) { return true; } 1140 1141 // Iterators 1142 virtual child_iterator child_begin(); 1143 virtual child_iterator child_end(); 1144}; 1145 1146 1147/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1148/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1149/// while its subclasses may represent alternative syntax that (semantically) 1150/// results in a function call. For example, CXXOperatorCallExpr is 1151/// a subclass for overloaded operator calls that use operator syntax, e.g., 1152/// "str1 + str2" to resolve to a function call. 1153class CallExpr : public Expr { 1154 enum { FN=0, ARGS_START=1 }; 1155 Stmt **SubExprs; 1156 unsigned NumArgs; 1157 SourceLocation RParenLoc; 1158 1159protected: 1160 // This version of the constructor is for derived classes. 1161 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1162 QualType t, SourceLocation rparenloc); 1163 1164 virtual void DoDestroy(ASTContext& C); 1165 1166public: 1167 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1168 SourceLocation rparenloc); 1169 1170 /// \brief Build an empty call expression. 1171 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1172 1173 ~CallExpr() {} 1174 1175 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1176 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1177 void setCallee(Expr *F) { SubExprs[FN] = F; } 1178 1179 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1180 FunctionDecl *getDirectCallee(); 1181 const FunctionDecl *getDirectCallee() const { 1182 return const_cast<CallExpr*>(this)->getDirectCallee(); 1183 } 1184 1185 /// getNumArgs - Return the number of actual arguments to this call. 1186 /// 1187 unsigned getNumArgs() const { return NumArgs; } 1188 1189 /// getArg - Return the specified argument. 1190 Expr *getArg(unsigned Arg) { 1191 assert(Arg < NumArgs && "Arg access out of range!"); 1192 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1193 } 1194 const Expr *getArg(unsigned Arg) const { 1195 assert(Arg < NumArgs && "Arg access out of range!"); 1196 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1197 } 1198 1199 /// setArg - Set the specified argument. 1200 void setArg(unsigned Arg, Expr *ArgExpr) { 1201 assert(Arg < NumArgs && "Arg access out of range!"); 1202 SubExprs[Arg+ARGS_START] = ArgExpr; 1203 } 1204 1205 /// setNumArgs - This changes the number of arguments present in this call. 1206 /// Any orphaned expressions are deleted by this, and any new operands are set 1207 /// to null. 1208 void setNumArgs(ASTContext& C, unsigned NumArgs); 1209 1210 typedef ExprIterator arg_iterator; 1211 typedef ConstExprIterator const_arg_iterator; 1212 1213 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1214 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1215 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1216 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1217 1218 /// getNumCommas - Return the number of commas that must have been present in 1219 /// this function call. 1220 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1221 1222 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1223 /// not, return 0. 1224 unsigned isBuiltinCall(ASTContext &Context) const; 1225 1226 /// getCallReturnType - Get the return type of the call expr. This is not 1227 /// always the type of the expr itself, if the return type is a reference 1228 /// type. 1229 QualType getCallReturnType() const; 1230 1231 SourceLocation getRParenLoc() const { return RParenLoc; } 1232 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1233 1234 virtual SourceRange getSourceRange() const { 1235 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1236 } 1237 1238 static bool classof(const Stmt *T) { 1239 return T->getStmtClass() == CallExprClass || 1240 T->getStmtClass() == CXXOperatorCallExprClass || 1241 T->getStmtClass() == CXXMemberCallExprClass; 1242 } 1243 static bool classof(const CallExpr *) { return true; } 1244 static bool classof(const CXXOperatorCallExpr *) { return true; } 1245 static bool classof(const CXXMemberCallExpr *) { return true; } 1246 1247 // Iterators 1248 virtual child_iterator child_begin(); 1249 virtual child_iterator child_end(); 1250}; 1251 1252/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1253/// 1254class MemberExpr : public Expr { 1255 /// Base - the expression for the base pointer or structure references. In 1256 /// X.F, this is "X". 1257 Stmt *Base; 1258 1259 /// MemberDecl - This is the decl being referenced by the field/member name. 1260 /// In X.F, this is the decl referenced by F. 1261 ValueDecl *MemberDecl; 1262 1263 /// MemberLoc - This is the location of the member name. 1264 SourceLocation MemberLoc; 1265 1266 /// IsArrow - True if this is "X->F", false if this is "X.F". 1267 bool IsArrow : 1; 1268 1269 /// \brief True if this member expression used a nested-name-specifier to 1270 /// refer to the member, e.g., "x->Base::f". When true, a NameQualifier 1271 /// structure is allocated immediately after the MemberExpr. 1272 bool HasQualifier : 1; 1273 1274 /// \brief True if this member expression specified a template argument list 1275 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1276 /// structure (and its TemplateArguments) are allocated immediately after 1277 /// the MemberExpr or, if the member expression also has a qualifier, after 1278 /// the NameQualifier structure. 1279 bool HasExplicitTemplateArgumentList : 1; 1280 1281 /// \brief Retrieve the qualifier that preceded the member name, if any. 1282 NameQualifier *getMemberQualifier() { 1283 if (!HasQualifier) 1284 return 0; 1285 1286 return reinterpret_cast<NameQualifier *> (this + 1); 1287 } 1288 1289 /// \brief Retrieve the qualifier that preceded the member name, if any. 1290 const NameQualifier *getMemberQualifier() const { 1291 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1292 } 1293 1294 /// \brief Retrieve the explicit template argument list that followed the 1295 /// member template name, if any. 1296 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1297 if (!HasExplicitTemplateArgumentList) 1298 return 0; 1299 1300 if (!HasQualifier) 1301 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1302 1303 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1304 getMemberQualifier() + 1); 1305 } 1306 1307 /// \brief Retrieve the explicit template argument list that followed the 1308 /// member template name, if any. 1309 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1310 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1311 } 1312 1313 MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 1314 SourceRange qualrange, ValueDecl *memberdecl, SourceLocation l, 1315 const TemplateArgumentListInfo *targs, QualType ty); 1316 1317public: 1318 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1319 SourceLocation l, QualType ty) 1320 : Expr(MemberExprClass, ty, 1321 base->isTypeDependent(), base->isValueDependent()), 1322 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1323 HasQualifier(false), HasExplicitTemplateArgumentList(false) {} 1324 1325 /// \brief Build an empty member reference expression. 1326 explicit MemberExpr(EmptyShell Empty) 1327 : Expr(MemberExprClass, Empty), HasQualifier(false), 1328 HasExplicitTemplateArgumentList(false) { } 1329 1330 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1331 NestedNameSpecifier *qual, SourceRange qualrange, 1332 ValueDecl *memberdecl, 1333 SourceLocation l, 1334 const TemplateArgumentListInfo *targs, 1335 QualType ty); 1336 1337 void setBase(Expr *E) { Base = E; } 1338 Expr *getBase() const { return cast<Expr>(Base); } 1339 1340 /// \brief Retrieve the member declaration to which this expression refers. 1341 /// 1342 /// The returned declaration will either be a FieldDecl or (in C++) 1343 /// a CXXMethodDecl. 1344 ValueDecl *getMemberDecl() const { return MemberDecl; } 1345 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1346 1347 /// \brief Determines whether this member expression actually had 1348 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1349 /// x->Base::foo. 1350 bool hasQualifier() const { return HasQualifier; } 1351 1352 /// \brief If the member name was qualified, retrieves the source range of 1353 /// the nested-name-specifier that precedes the member name. Otherwise, 1354 /// returns an empty source range. 1355 SourceRange getQualifierRange() const { 1356 if (!HasQualifier) 1357 return SourceRange(); 1358 1359 return getMemberQualifier()->Range; 1360 } 1361 1362 /// \brief If the member name was qualified, retrieves the 1363 /// nested-name-specifier that precedes the member name. Otherwise, returns 1364 /// NULL. 1365 NestedNameSpecifier *getQualifier() const { 1366 if (!HasQualifier) 1367 return 0; 1368 1369 return getMemberQualifier()->NNS; 1370 } 1371 1372 /// \brief Determines whether this member expression actually had a C++ 1373 /// template argument list explicitly specified, e.g., x.f<int>. 1374 bool hasExplicitTemplateArgumentList() const { 1375 return HasExplicitTemplateArgumentList; 1376 } 1377 1378 /// \brief Copies the template arguments (if present) into the given 1379 /// structure. 1380 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1381 if (hasExplicitTemplateArgumentList()) 1382 getExplicitTemplateArgumentList()->copyInto(List); 1383 } 1384 1385 /// \brief Retrieve the location of the left angle bracket following the 1386 /// member name ('<'), if any. 1387 SourceLocation getLAngleLoc() const { 1388 if (!HasExplicitTemplateArgumentList) 1389 return SourceLocation(); 1390 1391 return getExplicitTemplateArgumentList()->LAngleLoc; 1392 } 1393 1394 /// \brief Retrieve the template arguments provided as part of this 1395 /// template-id. 1396 const TemplateArgumentLoc *getTemplateArgs() const { 1397 if (!HasExplicitTemplateArgumentList) 1398 return 0; 1399 1400 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1401 } 1402 1403 /// \brief Retrieve the number of template arguments provided as part of this 1404 /// template-id. 1405 unsigned getNumTemplateArgs() const { 1406 if (!HasExplicitTemplateArgumentList) 1407 return 0; 1408 1409 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1410 } 1411 1412 /// \brief Retrieve the location of the right angle bracket following the 1413 /// template arguments ('>'). 1414 SourceLocation getRAngleLoc() const { 1415 if (!HasExplicitTemplateArgumentList) 1416 return SourceLocation(); 1417 1418 return getExplicitTemplateArgumentList()->RAngleLoc; 1419 } 1420 1421 bool isArrow() const { return IsArrow; } 1422 void setArrow(bool A) { IsArrow = A; } 1423 1424 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1425 /// location of 'F'. 1426 SourceLocation getMemberLoc() const { return MemberLoc; } 1427 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1428 1429 virtual SourceRange getSourceRange() const { 1430 // If we have an implicit base (like a C++ implicit this), 1431 // make sure not to return its location 1432 SourceLocation EndLoc = MemberLoc; 1433 if (HasExplicitTemplateArgumentList) 1434 EndLoc = getRAngleLoc(); 1435 1436 SourceLocation BaseLoc = getBase()->getLocStart(); 1437 if (BaseLoc.isInvalid()) 1438 return SourceRange(MemberLoc, EndLoc); 1439 return SourceRange(BaseLoc, EndLoc); 1440 } 1441 1442 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1443 1444 static bool classof(const Stmt *T) { 1445 return T->getStmtClass() == MemberExprClass; 1446 } 1447 static bool classof(const MemberExpr *) { return true; } 1448 1449 // Iterators 1450 virtual child_iterator child_begin(); 1451 virtual child_iterator child_end(); 1452}; 1453 1454/// CompoundLiteralExpr - [C99 6.5.2.5] 1455/// 1456class CompoundLiteralExpr : public Expr { 1457 /// LParenLoc - If non-null, this is the location of the left paren in a 1458 /// compound literal like "(int){4}". This can be null if this is a 1459 /// synthesized compound expression. 1460 SourceLocation LParenLoc; 1461 Stmt *Init; 1462 bool FileScope; 1463public: 1464 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1465 bool fileScope) 1466 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1467 FileScope(fileScope) {} 1468 1469 /// \brief Construct an empty compound literal. 1470 explicit CompoundLiteralExpr(EmptyShell Empty) 1471 : Expr(CompoundLiteralExprClass, Empty) { } 1472 1473 const Expr *getInitializer() const { return cast<Expr>(Init); } 1474 Expr *getInitializer() { return cast<Expr>(Init); } 1475 void setInitializer(Expr *E) { Init = E; } 1476 1477 bool isFileScope() const { return FileScope; } 1478 void setFileScope(bool FS) { FileScope = FS; } 1479 1480 SourceLocation getLParenLoc() const { return LParenLoc; } 1481 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1482 1483 virtual SourceRange getSourceRange() const { 1484 // FIXME: Init should never be null. 1485 if (!Init) 1486 return SourceRange(); 1487 if (LParenLoc.isInvalid()) 1488 return Init->getSourceRange(); 1489 return SourceRange(LParenLoc, Init->getLocEnd()); 1490 } 1491 1492 static bool classof(const Stmt *T) { 1493 return T->getStmtClass() == CompoundLiteralExprClass; 1494 } 1495 static bool classof(const CompoundLiteralExpr *) { return true; } 1496 1497 // Iterators 1498 virtual child_iterator child_begin(); 1499 virtual child_iterator child_end(); 1500}; 1501 1502/// CastExpr - Base class for type casts, including both implicit 1503/// casts (ImplicitCastExpr) and explicit casts that have some 1504/// representation in the source code (ExplicitCastExpr's derived 1505/// classes). 1506class CastExpr : public Expr { 1507public: 1508 /// CastKind - the kind of cast this represents. 1509 enum CastKind { 1510 /// CK_Unknown - Unknown cast kind. 1511 /// FIXME: The goal is to get rid of this and make all casts have a 1512 /// kind so that the AST client doesn't have to try to figure out what's 1513 /// going on. 1514 CK_Unknown, 1515 1516 /// CK_BitCast - Used for reinterpret_cast. 1517 CK_BitCast, 1518 1519 /// CK_NoOp - Used for const_cast. 1520 CK_NoOp, 1521 1522 /// CK_BaseToDerived - Base to derived class casts. 1523 CK_BaseToDerived, 1524 1525 /// CK_DerivedToBase - Derived to base class casts. 1526 CK_DerivedToBase, 1527 1528 /// CK_Dynamic - Dynamic cast. 1529 CK_Dynamic, 1530 1531 /// CK_ToUnion - Cast to union (GCC extension). 1532 CK_ToUnion, 1533 1534 /// CK_ArrayToPointerDecay - Array to pointer decay. 1535 CK_ArrayToPointerDecay, 1536 1537 // CK_FunctionToPointerDecay - Function to pointer decay. 1538 CK_FunctionToPointerDecay, 1539 1540 /// CK_NullToMemberPointer - Null pointer to member pointer. 1541 CK_NullToMemberPointer, 1542 1543 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1544 /// member pointer in derived class. 1545 CK_BaseToDerivedMemberPointer, 1546 1547 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1548 /// member pointer in base class. 1549 CK_DerivedToBaseMemberPointer, 1550 1551 /// CK_UserDefinedConversion - Conversion using a user defined type 1552 /// conversion function. 1553 CK_UserDefinedConversion, 1554 1555 /// CK_ConstructorConversion - Conversion by constructor 1556 CK_ConstructorConversion, 1557 1558 /// CK_IntegralToPointer - Integral to pointer 1559 CK_IntegralToPointer, 1560 1561 /// CK_PointerToIntegral - Pointer to integral 1562 CK_PointerToIntegral, 1563 1564 /// CK_ToVoid - Cast to void. 1565 CK_ToVoid, 1566 1567 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1568 /// vector type with the same element type as the src type. Splats the 1569 /// src expression into the destination expression. 1570 CK_VectorSplat, 1571 1572 /// CK_IntegralCast - Casting between integral types of different size. 1573 CK_IntegralCast, 1574 1575 /// CK_IntegralToFloating - Integral to floating point. 1576 CK_IntegralToFloating, 1577 1578 /// CK_FloatingToIntegral - Floating point to integral. 1579 CK_FloatingToIntegral, 1580 1581 /// CK_FloatingCast - Casting between floating types of different size. 1582 CK_FloatingCast, 1583 1584 /// CK_MemberPointerToBoolean - Member pointer to boolean 1585 CK_MemberPointerToBoolean, 1586 1587 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1588 /// pointer 1589 CK_AnyPointerToObjCPointerCast, 1590 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1591 /// pointer 1592 CK_AnyPointerToBlockPointerCast 1593 1594 }; 1595 1596private: 1597 CastKind Kind; 1598 Stmt *Op; 1599protected: 1600 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op) : 1601 Expr(SC, ty, 1602 // Cast expressions are type-dependent if the type is 1603 // dependent (C++ [temp.dep.expr]p3). 1604 ty->isDependentType(), 1605 // Cast expressions are value-dependent if the type is 1606 // dependent or if the subexpression is value-dependent. 1607 ty->isDependentType() || (op && op->isValueDependent())), 1608 Kind(kind), Op(op) {} 1609 1610 /// \brief Construct an empty cast. 1611 CastExpr(StmtClass SC, EmptyShell Empty) 1612 : Expr(SC, Empty) { } 1613 1614public: 1615 CastKind getCastKind() const { return Kind; } 1616 void setCastKind(CastKind K) { Kind = K; } 1617 const char *getCastKindName() const; 1618 1619 Expr *getSubExpr() { return cast<Expr>(Op); } 1620 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1621 void setSubExpr(Expr *E) { Op = E; } 1622 1623 /// \brief Retrieve the cast subexpression as it was written in the source 1624 /// code, looking through any implicit casts or other intermediate nodes 1625 /// introduced by semantic analysis. 1626 Expr *getSubExprAsWritten(); 1627 const Expr *getSubExprAsWritten() const { 1628 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 1629 } 1630 1631 static bool classof(const Stmt *T) { 1632 StmtClass SC = T->getStmtClass(); 1633 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1634 return true; 1635 1636 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1637 return true; 1638 1639 return false; 1640 } 1641 static bool classof(const CastExpr *) { return true; } 1642 1643 // Iterators 1644 virtual child_iterator child_begin(); 1645 virtual child_iterator child_end(); 1646}; 1647 1648/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1649/// conversions, which have no direct representation in the original 1650/// source code. For example: converting T[]->T*, void f()->void 1651/// (*f)(), float->double, short->int, etc. 1652/// 1653/// In C, implicit casts always produce rvalues. However, in C++, an 1654/// implicit cast whose result is being bound to a reference will be 1655/// an lvalue. For example: 1656/// 1657/// @code 1658/// class Base { }; 1659/// class Derived : public Base { }; 1660/// void f(Derived d) { 1661/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1662/// } 1663/// @endcode 1664class ImplicitCastExpr : public CastExpr { 1665 /// LvalueCast - Whether this cast produces an lvalue. 1666 bool LvalueCast; 1667 1668public: 1669 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1670 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1671 1672 /// \brief Construct an empty implicit cast. 1673 explicit ImplicitCastExpr(EmptyShell Shell) 1674 : CastExpr(ImplicitCastExprClass, Shell) { } 1675 1676 1677 virtual SourceRange getSourceRange() const { 1678 return getSubExpr()->getSourceRange(); 1679 } 1680 1681 /// isLvalueCast - Whether this cast produces an lvalue. 1682 bool isLvalueCast() const { return LvalueCast; } 1683 1684 /// setLvalueCast - Set whether this cast produces an lvalue. 1685 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1686 1687 static bool classof(const Stmt *T) { 1688 return T->getStmtClass() == ImplicitCastExprClass; 1689 } 1690 static bool classof(const ImplicitCastExpr *) { return true; } 1691}; 1692 1693/// ExplicitCastExpr - An explicit cast written in the source 1694/// code. 1695/// 1696/// This class is effectively an abstract class, because it provides 1697/// the basic representation of an explicitly-written cast without 1698/// specifying which kind of cast (C cast, functional cast, static 1699/// cast, etc.) was written; specific derived classes represent the 1700/// particular style of cast and its location information. 1701/// 1702/// Unlike implicit casts, explicit cast nodes have two different 1703/// types: the type that was written into the source code, and the 1704/// actual type of the expression as determined by semantic 1705/// analysis. These types may differ slightly. For example, in C++ one 1706/// can cast to a reference type, which indicates that the resulting 1707/// expression will be an lvalue. The reference type, however, will 1708/// not be used as the type of the expression. 1709class ExplicitCastExpr : public CastExpr { 1710 /// TypeAsWritten - The type that this expression is casting to, as 1711 /// written in the source code. 1712 QualType TypeAsWritten; 1713 1714protected: 1715 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1716 Expr *op, QualType writtenTy) 1717 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1718 1719 /// \brief Construct an empty explicit cast. 1720 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1721 : CastExpr(SC, Shell) { } 1722 1723public: 1724 /// getTypeAsWritten - Returns the type that this expression is 1725 /// casting to, as written in the source code. 1726 QualType getTypeAsWritten() const { return TypeAsWritten; } 1727 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1728 1729 static bool classof(const Stmt *T) { 1730 StmtClass SC = T->getStmtClass(); 1731 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1732 return true; 1733 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1734 return true; 1735 1736 return false; 1737 } 1738 static bool classof(const ExplicitCastExpr *) { return true; } 1739}; 1740 1741/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1742/// cast in C++ (C++ [expr.cast]), which uses the syntax 1743/// (Type)expr. For example: @c (int)f. 1744class CStyleCastExpr : public ExplicitCastExpr { 1745 SourceLocation LPLoc; // the location of the left paren 1746 SourceLocation RPLoc; // the location of the right paren 1747public: 1748 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1749 SourceLocation l, SourceLocation r) : 1750 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1751 LPLoc(l), RPLoc(r) {} 1752 1753 /// \brief Construct an empty C-style explicit cast. 1754 explicit CStyleCastExpr(EmptyShell Shell) 1755 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1756 1757 SourceLocation getLParenLoc() const { return LPLoc; } 1758 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1759 1760 SourceLocation getRParenLoc() const { return RPLoc; } 1761 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1762 1763 virtual SourceRange getSourceRange() const { 1764 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1765 } 1766 static bool classof(const Stmt *T) { 1767 return T->getStmtClass() == CStyleCastExprClass; 1768 } 1769 static bool classof(const CStyleCastExpr *) { return true; } 1770}; 1771 1772/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1773/// 1774/// This expression node kind describes a builtin binary operation, 1775/// such as "x + y" for integer values "x" and "y". The operands will 1776/// already have been converted to appropriate types (e.g., by 1777/// performing promotions or conversions). 1778/// 1779/// In C++, where operators may be overloaded, a different kind of 1780/// expression node (CXXOperatorCallExpr) is used to express the 1781/// invocation of an overloaded operator with operator syntax. Within 1782/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1783/// used to store an expression "x + y" depends on the subexpressions 1784/// for x and y. If neither x or y is type-dependent, and the "+" 1785/// operator resolves to a built-in operation, BinaryOperator will be 1786/// used to express the computation (x and y may still be 1787/// value-dependent). If either x or y is type-dependent, or if the 1788/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1789/// be used to express the computation. 1790class BinaryOperator : public Expr { 1791public: 1792 enum Opcode { 1793 // Operators listed in order of precedence. 1794 // Note that additions to this should also update the StmtVisitor class. 1795 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1796 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1797 Add, Sub, // [C99 6.5.6] Additive operators. 1798 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1799 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1800 EQ, NE, // [C99 6.5.9] Equality operators. 1801 And, // [C99 6.5.10] Bitwise AND operator. 1802 Xor, // [C99 6.5.11] Bitwise XOR operator. 1803 Or, // [C99 6.5.12] Bitwise OR operator. 1804 LAnd, // [C99 6.5.13] Logical AND operator. 1805 LOr, // [C99 6.5.14] Logical OR operator. 1806 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1807 DivAssign, RemAssign, 1808 AddAssign, SubAssign, 1809 ShlAssign, ShrAssign, 1810 AndAssign, XorAssign, 1811 OrAssign, 1812 Comma // [C99 6.5.17] Comma operator. 1813 }; 1814private: 1815 enum { LHS, RHS, END_EXPR }; 1816 Stmt* SubExprs[END_EXPR]; 1817 Opcode Opc; 1818 SourceLocation OpLoc; 1819public: 1820 1821 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1822 SourceLocation opLoc) 1823 : Expr(BinaryOperatorClass, ResTy, 1824 lhs->isTypeDependent() || rhs->isTypeDependent(), 1825 lhs->isValueDependent() || rhs->isValueDependent()), 1826 Opc(opc), OpLoc(opLoc) { 1827 SubExprs[LHS] = lhs; 1828 SubExprs[RHS] = rhs; 1829 assert(!isCompoundAssignmentOp() && 1830 "Use ArithAssignBinaryOperator for compound assignments"); 1831 } 1832 1833 /// \brief Construct an empty binary operator. 1834 explicit BinaryOperator(EmptyShell Empty) 1835 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1836 1837 SourceLocation getOperatorLoc() const { return OpLoc; } 1838 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1839 1840 Opcode getOpcode() const { return Opc; } 1841 void setOpcode(Opcode O) { Opc = O; } 1842 1843 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1844 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1845 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1846 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1847 1848 virtual SourceRange getSourceRange() const { 1849 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1850 } 1851 1852 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1853 /// corresponds to, e.g. "<<=". 1854 static const char *getOpcodeStr(Opcode Op); 1855 1856 /// \brief Retrieve the binary opcode that corresponds to the given 1857 /// overloaded operator. 1858 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1859 1860 /// \brief Retrieve the overloaded operator kind that corresponds to 1861 /// the given binary opcode. 1862 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1863 1864 /// predicates to categorize the respective opcodes. 1865 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1866 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1867 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1868 bool isShiftOp() const { return isShiftOp(Opc); } 1869 1870 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1871 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1872 1873 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1874 bool isRelationalOp() const { return isRelationalOp(Opc); } 1875 1876 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1877 bool isEqualityOp() const { return isEqualityOp(Opc); } 1878 1879 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1880 bool isComparisonOp() const { return isComparisonOp(Opc); } 1881 1882 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1883 bool isLogicalOp() const { return isLogicalOp(Opc); } 1884 1885 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1886 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1887 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1888 1889 static bool classof(const Stmt *S) { 1890 return S->getStmtClass() == BinaryOperatorClass || 1891 S->getStmtClass() == CompoundAssignOperatorClass; 1892 } 1893 static bool classof(const BinaryOperator *) { return true; } 1894 1895 // Iterators 1896 virtual child_iterator child_begin(); 1897 virtual child_iterator child_end(); 1898 1899protected: 1900 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1901 SourceLocation oploc, bool dead) 1902 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1903 SubExprs[LHS] = lhs; 1904 SubExprs[RHS] = rhs; 1905 } 1906 1907 BinaryOperator(StmtClass SC, EmptyShell Empty) 1908 : Expr(SC, Empty), Opc(MulAssign) { } 1909}; 1910 1911/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1912/// track of the type the operation is performed in. Due to the semantics of 1913/// these operators, the operands are promoted, the aritmetic performed, an 1914/// implicit conversion back to the result type done, then the assignment takes 1915/// place. This captures the intermediate type which the computation is done 1916/// in. 1917class CompoundAssignOperator : public BinaryOperator { 1918 QualType ComputationLHSType; 1919 QualType ComputationResultType; 1920public: 1921 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1922 QualType ResType, QualType CompLHSType, 1923 QualType CompResultType, 1924 SourceLocation OpLoc) 1925 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1926 ComputationLHSType(CompLHSType), 1927 ComputationResultType(CompResultType) { 1928 assert(isCompoundAssignmentOp() && 1929 "Only should be used for compound assignments"); 1930 } 1931 1932 /// \brief Build an empty compound assignment operator expression. 1933 explicit CompoundAssignOperator(EmptyShell Empty) 1934 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1935 1936 // The two computation types are the type the LHS is converted 1937 // to for the computation and the type of the result; the two are 1938 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1939 QualType getComputationLHSType() const { return ComputationLHSType; } 1940 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1941 1942 QualType getComputationResultType() const { return ComputationResultType; } 1943 void setComputationResultType(QualType T) { ComputationResultType = T; } 1944 1945 static bool classof(const CompoundAssignOperator *) { return true; } 1946 static bool classof(const Stmt *S) { 1947 return S->getStmtClass() == CompoundAssignOperatorClass; 1948 } 1949}; 1950 1951/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1952/// GNU "missing LHS" extension is in use. 1953/// 1954class ConditionalOperator : public Expr { 1955 enum { COND, LHS, RHS, END_EXPR }; 1956 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1957 SourceLocation QuestionLoc, ColonLoc; 1958public: 1959 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1960 SourceLocation CLoc, Expr *rhs, QualType t) 1961 : Expr(ConditionalOperatorClass, t, 1962 // FIXME: the type of the conditional operator doesn't 1963 // depend on the type of the conditional, but the standard 1964 // seems to imply that it could. File a bug! 1965 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1966 (cond->isValueDependent() || 1967 (lhs && lhs->isValueDependent()) || 1968 (rhs && rhs->isValueDependent()))), 1969 QuestionLoc(QLoc), 1970 ColonLoc(CLoc) { 1971 SubExprs[COND] = cond; 1972 SubExprs[LHS] = lhs; 1973 SubExprs[RHS] = rhs; 1974 } 1975 1976 /// \brief Build an empty conditional operator. 1977 explicit ConditionalOperator(EmptyShell Empty) 1978 : Expr(ConditionalOperatorClass, Empty) { } 1979 1980 // getCond - Return the expression representing the condition for 1981 // the ?: operator. 1982 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1983 void setCond(Expr *E) { SubExprs[COND] = E; } 1984 1985 // getTrueExpr - Return the subexpression representing the value of the ?: 1986 // expression if the condition evaluates to true. In most cases this value 1987 // will be the same as getLHS() except a GCC extension allows the left 1988 // subexpression to be omitted, and instead of the condition be returned. 1989 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1990 // is only evaluated once. 1991 Expr *getTrueExpr() const { 1992 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1993 } 1994 1995 // getTrueExpr - Return the subexpression representing the value of the ?: 1996 // expression if the condition evaluates to false. This is the same as getRHS. 1997 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1998 1999 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2000 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2001 2002 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2003 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2004 2005 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2006 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2007 2008 SourceLocation getColonLoc() const { return ColonLoc; } 2009 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2010 2011 virtual SourceRange getSourceRange() const { 2012 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2013 } 2014 static bool classof(const Stmt *T) { 2015 return T->getStmtClass() == ConditionalOperatorClass; 2016 } 2017 static bool classof(const ConditionalOperator *) { return true; } 2018 2019 // Iterators 2020 virtual child_iterator child_begin(); 2021 virtual child_iterator child_end(); 2022}; 2023 2024/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2025class AddrLabelExpr : public Expr { 2026 SourceLocation AmpAmpLoc, LabelLoc; 2027 LabelStmt *Label; 2028public: 2029 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2030 QualType t) 2031 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2032 2033 /// \brief Build an empty address of a label expression. 2034 explicit AddrLabelExpr(EmptyShell Empty) 2035 : Expr(AddrLabelExprClass, Empty) { } 2036 2037 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2038 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2039 SourceLocation getLabelLoc() const { return LabelLoc; } 2040 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2041 2042 virtual SourceRange getSourceRange() const { 2043 return SourceRange(AmpAmpLoc, LabelLoc); 2044 } 2045 2046 LabelStmt *getLabel() const { return Label; } 2047 void setLabel(LabelStmt *S) { Label = S; } 2048 2049 static bool classof(const Stmt *T) { 2050 return T->getStmtClass() == AddrLabelExprClass; 2051 } 2052 static bool classof(const AddrLabelExpr *) { return true; } 2053 2054 // Iterators 2055 virtual child_iterator child_begin(); 2056 virtual child_iterator child_end(); 2057}; 2058 2059/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2060/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2061/// takes the value of the last subexpression. 2062class StmtExpr : public Expr { 2063 Stmt *SubStmt; 2064 SourceLocation LParenLoc, RParenLoc; 2065public: 2066 StmtExpr(CompoundStmt *substmt, QualType T, 2067 SourceLocation lp, SourceLocation rp) : 2068 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2069 2070 /// \brief Build an empty statement expression. 2071 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2072 2073 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2074 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2075 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2076 2077 virtual SourceRange getSourceRange() const { 2078 return SourceRange(LParenLoc, RParenLoc); 2079 } 2080 2081 SourceLocation getLParenLoc() const { return LParenLoc; } 2082 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2083 SourceLocation getRParenLoc() const { return RParenLoc; } 2084 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2085 2086 static bool classof(const Stmt *T) { 2087 return T->getStmtClass() == StmtExprClass; 2088 } 2089 static bool classof(const StmtExpr *) { return true; } 2090 2091 // Iterators 2092 virtual child_iterator child_begin(); 2093 virtual child_iterator child_end(); 2094}; 2095 2096/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2097/// This AST node represents a function that returns 1 if two *types* (not 2098/// expressions) are compatible. The result of this built-in function can be 2099/// used in integer constant expressions. 2100class TypesCompatibleExpr : public Expr { 2101 QualType Type1; 2102 QualType Type2; 2103 SourceLocation BuiltinLoc, RParenLoc; 2104public: 2105 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2106 QualType t1, QualType t2, SourceLocation RP) : 2107 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 2108 BuiltinLoc(BLoc), RParenLoc(RP) {} 2109 2110 /// \brief Build an empty __builtin_type_compatible_p expression. 2111 explicit TypesCompatibleExpr(EmptyShell Empty) 2112 : Expr(TypesCompatibleExprClass, Empty) { } 2113 2114 QualType getArgType1() const { return Type1; } 2115 void setArgType1(QualType T) { Type1 = T; } 2116 QualType getArgType2() const { return Type2; } 2117 void setArgType2(QualType T) { Type2 = T; } 2118 2119 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2120 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2121 2122 SourceLocation getRParenLoc() const { return RParenLoc; } 2123 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2124 2125 virtual SourceRange getSourceRange() const { 2126 return SourceRange(BuiltinLoc, RParenLoc); 2127 } 2128 static bool classof(const Stmt *T) { 2129 return T->getStmtClass() == TypesCompatibleExprClass; 2130 } 2131 static bool classof(const TypesCompatibleExpr *) { return true; } 2132 2133 // Iterators 2134 virtual child_iterator child_begin(); 2135 virtual child_iterator child_end(); 2136}; 2137 2138/// ShuffleVectorExpr - clang-specific builtin-in function 2139/// __builtin_shufflevector. 2140/// This AST node represents a operator that does a constant 2141/// shuffle, similar to LLVM's shufflevector instruction. It takes 2142/// two vectors and a variable number of constant indices, 2143/// and returns the appropriately shuffled vector. 2144class ShuffleVectorExpr : public Expr { 2145 SourceLocation BuiltinLoc, RParenLoc; 2146 2147 // SubExprs - the list of values passed to the __builtin_shufflevector 2148 // function. The first two are vectors, and the rest are constant 2149 // indices. The number of values in this list is always 2150 // 2+the number of indices in the vector type. 2151 Stmt **SubExprs; 2152 unsigned NumExprs; 2153 2154protected: 2155 virtual void DoDestroy(ASTContext &C); 2156 2157public: 2158 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2159 QualType Type, SourceLocation BLoc, 2160 SourceLocation RP) : 2161 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 2162 RParenLoc(RP), NumExprs(nexpr) { 2163 2164 SubExprs = new (C) Stmt*[nexpr]; 2165 for (unsigned i = 0; i < nexpr; i++) 2166 SubExprs[i] = args[i]; 2167 } 2168 2169 /// \brief Build an empty vector-shuffle expression. 2170 explicit ShuffleVectorExpr(EmptyShell Empty) 2171 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2172 2173 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2174 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2175 2176 SourceLocation getRParenLoc() const { return RParenLoc; } 2177 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2178 2179 virtual SourceRange getSourceRange() const { 2180 return SourceRange(BuiltinLoc, RParenLoc); 2181 } 2182 static bool classof(const Stmt *T) { 2183 return T->getStmtClass() == ShuffleVectorExprClass; 2184 } 2185 static bool classof(const ShuffleVectorExpr *) { return true; } 2186 2187 ~ShuffleVectorExpr() {} 2188 2189 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2190 /// constant expression, the actual arguments passed in, and the function 2191 /// pointers. 2192 unsigned getNumSubExprs() const { return NumExprs; } 2193 2194 /// getExpr - Return the Expr at the specified index. 2195 Expr *getExpr(unsigned Index) { 2196 assert((Index < NumExprs) && "Arg access out of range!"); 2197 return cast<Expr>(SubExprs[Index]); 2198 } 2199 const Expr *getExpr(unsigned Index) const { 2200 assert((Index < NumExprs) && "Arg access out of range!"); 2201 return cast<Expr>(SubExprs[Index]); 2202 } 2203 2204 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2205 2206 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2207 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2208 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2209 } 2210 2211 // Iterators 2212 virtual child_iterator child_begin(); 2213 virtual child_iterator child_end(); 2214}; 2215 2216/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2217/// This AST node is similar to the conditional operator (?:) in C, with 2218/// the following exceptions: 2219/// - the test expression must be a integer constant expression. 2220/// - the expression returned acts like the chosen subexpression in every 2221/// visible way: the type is the same as that of the chosen subexpression, 2222/// and all predicates (whether it's an l-value, whether it's an integer 2223/// constant expression, etc.) return the same result as for the chosen 2224/// sub-expression. 2225class ChooseExpr : public Expr { 2226 enum { COND, LHS, RHS, END_EXPR }; 2227 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2228 SourceLocation BuiltinLoc, RParenLoc; 2229public: 2230 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2231 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2232 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2233 BuiltinLoc(BLoc), RParenLoc(RP) { 2234 SubExprs[COND] = cond; 2235 SubExprs[LHS] = lhs; 2236 SubExprs[RHS] = rhs; 2237 } 2238 2239 /// \brief Build an empty __builtin_choose_expr. 2240 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2241 2242 /// isConditionTrue - Return whether the condition is true (i.e. not 2243 /// equal to zero). 2244 bool isConditionTrue(ASTContext &C) const; 2245 2246 /// getChosenSubExpr - Return the subexpression chosen according to the 2247 /// condition. 2248 Expr *getChosenSubExpr(ASTContext &C) const { 2249 return isConditionTrue(C) ? getLHS() : getRHS(); 2250 } 2251 2252 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2253 void setCond(Expr *E) { SubExprs[COND] = E; } 2254 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2255 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2256 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2257 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2258 2259 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2260 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2261 2262 SourceLocation getRParenLoc() const { return RParenLoc; } 2263 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2264 2265 virtual SourceRange getSourceRange() const { 2266 return SourceRange(BuiltinLoc, RParenLoc); 2267 } 2268 static bool classof(const Stmt *T) { 2269 return T->getStmtClass() == ChooseExprClass; 2270 } 2271 static bool classof(const ChooseExpr *) { return true; } 2272 2273 // Iterators 2274 virtual child_iterator child_begin(); 2275 virtual child_iterator child_end(); 2276}; 2277 2278/// GNUNullExpr - Implements the GNU __null extension, which is a name 2279/// for a null pointer constant that has integral type (e.g., int or 2280/// long) and is the same size and alignment as a pointer. The __null 2281/// extension is typically only used by system headers, which define 2282/// NULL as __null in C++ rather than using 0 (which is an integer 2283/// that may not match the size of a pointer). 2284class GNUNullExpr : public Expr { 2285 /// TokenLoc - The location of the __null keyword. 2286 SourceLocation TokenLoc; 2287 2288public: 2289 GNUNullExpr(QualType Ty, SourceLocation Loc) 2290 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 2291 2292 /// \brief Build an empty GNU __null expression. 2293 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2294 2295 /// getTokenLocation - The location of the __null token. 2296 SourceLocation getTokenLocation() const { return TokenLoc; } 2297 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2298 2299 virtual SourceRange getSourceRange() const { 2300 return SourceRange(TokenLoc); 2301 } 2302 static bool classof(const Stmt *T) { 2303 return T->getStmtClass() == GNUNullExprClass; 2304 } 2305 static bool classof(const GNUNullExpr *) { return true; } 2306 2307 // Iterators 2308 virtual child_iterator child_begin(); 2309 virtual child_iterator child_end(); 2310}; 2311 2312/// VAArgExpr, used for the builtin function __builtin_va_start. 2313class VAArgExpr : public Expr { 2314 Stmt *Val; 2315 SourceLocation BuiltinLoc, RParenLoc; 2316public: 2317 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2318 : Expr(VAArgExprClass, t), 2319 Val(e), 2320 BuiltinLoc(BLoc), 2321 RParenLoc(RPLoc) { } 2322 2323 /// \brief Create an empty __builtin_va_start expression. 2324 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2325 2326 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2327 Expr *getSubExpr() { return cast<Expr>(Val); } 2328 void setSubExpr(Expr *E) { Val = E; } 2329 2330 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2331 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2332 2333 SourceLocation getRParenLoc() const { return RParenLoc; } 2334 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2335 2336 virtual SourceRange getSourceRange() const { 2337 return SourceRange(BuiltinLoc, RParenLoc); 2338 } 2339 static bool classof(const Stmt *T) { 2340 return T->getStmtClass() == VAArgExprClass; 2341 } 2342 static bool classof(const VAArgExpr *) { return true; } 2343 2344 // Iterators 2345 virtual child_iterator child_begin(); 2346 virtual child_iterator child_end(); 2347}; 2348 2349/// @brief Describes an C or C++ initializer list. 2350/// 2351/// InitListExpr describes an initializer list, which can be used to 2352/// initialize objects of different types, including 2353/// struct/class/union types, arrays, and vectors. For example: 2354/// 2355/// @code 2356/// struct foo x = { 1, { 2, 3 } }; 2357/// @endcode 2358/// 2359/// Prior to semantic analysis, an initializer list will represent the 2360/// initializer list as written by the user, but will have the 2361/// placeholder type "void". This initializer list is called the 2362/// syntactic form of the initializer, and may contain C99 designated 2363/// initializers (represented as DesignatedInitExprs), initializations 2364/// of subobject members without explicit braces, and so on. Clients 2365/// interested in the original syntax of the initializer list should 2366/// use the syntactic form of the initializer list. 2367/// 2368/// After semantic analysis, the initializer list will represent the 2369/// semantic form of the initializer, where the initializations of all 2370/// subobjects are made explicit with nested InitListExpr nodes and 2371/// C99 designators have been eliminated by placing the designated 2372/// initializations into the subobject they initialize. Additionally, 2373/// any "holes" in the initialization, where no initializer has been 2374/// specified for a particular subobject, will be replaced with 2375/// implicitly-generated ImplicitValueInitExpr expressions that 2376/// value-initialize the subobjects. Note, however, that the 2377/// initializer lists may still have fewer initializers than there are 2378/// elements to initialize within the object. 2379/// 2380/// Given the semantic form of the initializer list, one can retrieve 2381/// the original syntactic form of that initializer list (if it 2382/// exists) using getSyntacticForm(). Since many initializer lists 2383/// have the same syntactic and semantic forms, getSyntacticForm() may 2384/// return NULL, indicating that the current initializer list also 2385/// serves as its syntactic form. 2386class InitListExpr : public Expr { 2387 // FIXME: Eliminate this vector in favor of ASTContext allocation 2388 std::vector<Stmt *> InitExprs; 2389 SourceLocation LBraceLoc, RBraceLoc; 2390 2391 /// Contains the initializer list that describes the syntactic form 2392 /// written in the source code. 2393 InitListExpr *SyntacticForm; 2394 2395 /// If this initializer list initializes a union, specifies which 2396 /// field within the union will be initialized. 2397 FieldDecl *UnionFieldInit; 2398 2399 /// Whether this initializer list originally had a GNU array-range 2400 /// designator in it. This is a temporary marker used by CodeGen. 2401 bool HadArrayRangeDesignator; 2402 2403public: 2404 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2405 SourceLocation rbraceloc); 2406 2407 /// \brief Build an empty initializer list. 2408 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2409 2410 unsigned getNumInits() const { return InitExprs.size(); } 2411 2412 const Expr* getInit(unsigned Init) const { 2413 assert(Init < getNumInits() && "Initializer access out of range!"); 2414 return cast_or_null<Expr>(InitExprs[Init]); 2415 } 2416 2417 Expr* getInit(unsigned Init) { 2418 assert(Init < getNumInits() && "Initializer access out of range!"); 2419 return cast_or_null<Expr>(InitExprs[Init]); 2420 } 2421 2422 void setInit(unsigned Init, Expr *expr) { 2423 assert(Init < getNumInits() && "Initializer access out of range!"); 2424 InitExprs[Init] = expr; 2425 } 2426 2427 /// \brief Reserve space for some number of initializers. 2428 void reserveInits(unsigned NumInits); 2429 2430 /// @brief Specify the number of initializers 2431 /// 2432 /// If there are more than @p NumInits initializers, the remaining 2433 /// initializers will be destroyed. If there are fewer than @p 2434 /// NumInits initializers, NULL expressions will be added for the 2435 /// unknown initializers. 2436 void resizeInits(ASTContext &Context, unsigned NumInits); 2437 2438 /// @brief Updates the initializer at index @p Init with the new 2439 /// expression @p expr, and returns the old expression at that 2440 /// location. 2441 /// 2442 /// When @p Init is out of range for this initializer list, the 2443 /// initializer list will be extended with NULL expressions to 2444 /// accomodate the new entry. 2445 Expr *updateInit(unsigned Init, Expr *expr); 2446 2447 /// \brief If this initializes a union, specifies which field in the 2448 /// union to initialize. 2449 /// 2450 /// Typically, this field is the first named field within the 2451 /// union. However, a designated initializer can specify the 2452 /// initialization of a different field within the union. 2453 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2454 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2455 2456 // Explicit InitListExpr's originate from source code (and have valid source 2457 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2458 bool isExplicit() { 2459 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2460 } 2461 2462 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2463 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2464 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2465 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2466 2467 /// @brief Retrieve the initializer list that describes the 2468 /// syntactic form of the initializer. 2469 /// 2470 /// 2471 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2472 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2473 2474 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2475 void sawArrayRangeDesignator(bool ARD = true) { 2476 HadArrayRangeDesignator = ARD; 2477 } 2478 2479 virtual SourceRange getSourceRange() const { 2480 return SourceRange(LBraceLoc, RBraceLoc); 2481 } 2482 static bool classof(const Stmt *T) { 2483 return T->getStmtClass() == InitListExprClass; 2484 } 2485 static bool classof(const InitListExpr *) { return true; } 2486 2487 // Iterators 2488 virtual child_iterator child_begin(); 2489 virtual child_iterator child_end(); 2490 2491 typedef std::vector<Stmt *>::iterator iterator; 2492 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2493 2494 iterator begin() { return InitExprs.begin(); } 2495 iterator end() { return InitExprs.end(); } 2496 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2497 reverse_iterator rend() { return InitExprs.rend(); } 2498}; 2499 2500/// @brief Represents a C99 designated initializer expression. 2501/// 2502/// A designated initializer expression (C99 6.7.8) contains one or 2503/// more designators (which can be field designators, array 2504/// designators, or GNU array-range designators) followed by an 2505/// expression that initializes the field or element(s) that the 2506/// designators refer to. For example, given: 2507/// 2508/// @code 2509/// struct point { 2510/// double x; 2511/// double y; 2512/// }; 2513/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2514/// @endcode 2515/// 2516/// The InitListExpr contains three DesignatedInitExprs, the first of 2517/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2518/// designators, one array designator for @c [2] followed by one field 2519/// designator for @c .y. The initalization expression will be 1.0. 2520class DesignatedInitExpr : public Expr { 2521public: 2522 /// \brief Forward declaration of the Designator class. 2523 class Designator; 2524 2525private: 2526 /// The location of the '=' or ':' prior to the actual initializer 2527 /// expression. 2528 SourceLocation EqualOrColonLoc; 2529 2530 /// Whether this designated initializer used the GNU deprecated 2531 /// syntax rather than the C99 '=' syntax. 2532 bool GNUSyntax : 1; 2533 2534 /// The number of designators in this initializer expression. 2535 unsigned NumDesignators : 15; 2536 2537 /// \brief The designators in this designated initialization 2538 /// expression. 2539 Designator *Designators; 2540 2541 /// The number of subexpressions of this initializer expression, 2542 /// which contains both the initializer and any additional 2543 /// expressions used by array and array-range designators. 2544 unsigned NumSubExprs : 16; 2545 2546 2547 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2548 const Designator *Designators, 2549 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2550 Expr **IndexExprs, unsigned NumIndexExprs, 2551 Expr *Init); 2552 2553 explicit DesignatedInitExpr(unsigned NumSubExprs) 2554 : Expr(DesignatedInitExprClass, EmptyShell()), 2555 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2556 2557protected: 2558 virtual void DoDestroy(ASTContext &C); 2559 2560public: 2561 /// A field designator, e.g., ".x". 2562 struct FieldDesignator { 2563 /// Refers to the field that is being initialized. The low bit 2564 /// of this field determines whether this is actually a pointer 2565 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2566 /// initially constructed, a field designator will store an 2567 /// IdentifierInfo*. After semantic analysis has resolved that 2568 /// name, the field designator will instead store a FieldDecl*. 2569 uintptr_t NameOrField; 2570 2571 /// The location of the '.' in the designated initializer. 2572 unsigned DotLoc; 2573 2574 /// The location of the field name in the designated initializer. 2575 unsigned FieldLoc; 2576 }; 2577 2578 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2579 struct ArrayOrRangeDesignator { 2580 /// Location of the first index expression within the designated 2581 /// initializer expression's list of subexpressions. 2582 unsigned Index; 2583 /// The location of the '[' starting the array range designator. 2584 unsigned LBracketLoc; 2585 /// The location of the ellipsis separating the start and end 2586 /// indices. Only valid for GNU array-range designators. 2587 unsigned EllipsisLoc; 2588 /// The location of the ']' terminating the array range designator. 2589 unsigned RBracketLoc; 2590 }; 2591 2592 /// @brief Represents a single C99 designator. 2593 /// 2594 /// @todo This class is infuriatingly similar to clang::Designator, 2595 /// but minor differences (storing indices vs. storing pointers) 2596 /// keep us from reusing it. Try harder, later, to rectify these 2597 /// differences. 2598 class Designator { 2599 /// @brief The kind of designator this describes. 2600 enum { 2601 FieldDesignator, 2602 ArrayDesignator, 2603 ArrayRangeDesignator 2604 } Kind; 2605 2606 union { 2607 /// A field designator, e.g., ".x". 2608 struct FieldDesignator Field; 2609 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2610 struct ArrayOrRangeDesignator ArrayOrRange; 2611 }; 2612 friend class DesignatedInitExpr; 2613 2614 public: 2615 Designator() {} 2616 2617 /// @brief Initializes a field designator. 2618 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2619 SourceLocation FieldLoc) 2620 : Kind(FieldDesignator) { 2621 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2622 Field.DotLoc = DotLoc.getRawEncoding(); 2623 Field.FieldLoc = FieldLoc.getRawEncoding(); 2624 } 2625 2626 /// @brief Initializes an array designator. 2627 Designator(unsigned Index, SourceLocation LBracketLoc, 2628 SourceLocation RBracketLoc) 2629 : Kind(ArrayDesignator) { 2630 ArrayOrRange.Index = Index; 2631 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2632 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2633 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2634 } 2635 2636 /// @brief Initializes a GNU array-range designator. 2637 Designator(unsigned Index, SourceLocation LBracketLoc, 2638 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2639 : Kind(ArrayRangeDesignator) { 2640 ArrayOrRange.Index = Index; 2641 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2642 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2643 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2644 } 2645 2646 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2647 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2648 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2649 2650 IdentifierInfo * getFieldName(); 2651 2652 FieldDecl *getField() { 2653 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2654 if (Field.NameOrField & 0x01) 2655 return 0; 2656 else 2657 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2658 } 2659 2660 void setField(FieldDecl *FD) { 2661 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2662 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2663 } 2664 2665 SourceLocation getDotLoc() const { 2666 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2667 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2668 } 2669 2670 SourceLocation getFieldLoc() const { 2671 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2672 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2673 } 2674 2675 SourceLocation getLBracketLoc() const { 2676 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2677 "Only valid on an array or array-range designator"); 2678 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2679 } 2680 2681 SourceLocation getRBracketLoc() const { 2682 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2683 "Only valid on an array or array-range designator"); 2684 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2685 } 2686 2687 SourceLocation getEllipsisLoc() const { 2688 assert(Kind == ArrayRangeDesignator && 2689 "Only valid on an array-range designator"); 2690 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2691 } 2692 2693 unsigned getFirstExprIndex() const { 2694 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2695 "Only valid on an array or array-range designator"); 2696 return ArrayOrRange.Index; 2697 } 2698 2699 SourceLocation getStartLocation() const { 2700 if (Kind == FieldDesignator) 2701 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2702 else 2703 return getLBracketLoc(); 2704 } 2705 }; 2706 2707 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2708 unsigned NumDesignators, 2709 Expr **IndexExprs, unsigned NumIndexExprs, 2710 SourceLocation EqualOrColonLoc, 2711 bool GNUSyntax, Expr *Init); 2712 2713 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2714 2715 /// @brief Returns the number of designators in this initializer. 2716 unsigned size() const { return NumDesignators; } 2717 2718 // Iterator access to the designators. 2719 typedef Designator* designators_iterator; 2720 designators_iterator designators_begin() { return Designators; } 2721 designators_iterator designators_end() { 2722 return Designators + NumDesignators; 2723 } 2724 2725 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2726 2727 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2728 2729 Expr *getArrayIndex(const Designator& D); 2730 Expr *getArrayRangeStart(const Designator& D); 2731 Expr *getArrayRangeEnd(const Designator& D); 2732 2733 /// @brief Retrieve the location of the '=' that precedes the 2734 /// initializer value itself, if present. 2735 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2736 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2737 2738 /// @brief Determines whether this designated initializer used the 2739 /// deprecated GNU syntax for designated initializers. 2740 bool usesGNUSyntax() const { return GNUSyntax; } 2741 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2742 2743 /// @brief Retrieve the initializer value. 2744 Expr *getInit() const { 2745 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2746 } 2747 2748 void setInit(Expr *init) { 2749 *child_begin() = init; 2750 } 2751 2752 /// \brief Retrieve the total number of subexpressions in this 2753 /// designated initializer expression, including the actual 2754 /// initialized value and any expressions that occur within array 2755 /// and array-range designators. 2756 unsigned getNumSubExprs() const { return NumSubExprs; } 2757 2758 Expr *getSubExpr(unsigned Idx) { 2759 assert(Idx < NumSubExprs && "Subscript out of range"); 2760 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2761 Ptr += sizeof(DesignatedInitExpr); 2762 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2763 } 2764 2765 void setSubExpr(unsigned Idx, Expr *E) { 2766 assert(Idx < NumSubExprs && "Subscript out of range"); 2767 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2768 Ptr += sizeof(DesignatedInitExpr); 2769 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2770 } 2771 2772 /// \brief Replaces the designator at index @p Idx with the series 2773 /// of designators in [First, Last). 2774 void ExpandDesignator(unsigned Idx, const Designator *First, 2775 const Designator *Last); 2776 2777 virtual SourceRange getSourceRange() const; 2778 2779 static bool classof(const Stmt *T) { 2780 return T->getStmtClass() == DesignatedInitExprClass; 2781 } 2782 static bool classof(const DesignatedInitExpr *) { return true; } 2783 2784 // Iterators 2785 virtual child_iterator child_begin(); 2786 virtual child_iterator child_end(); 2787}; 2788 2789/// \brief Represents an implicitly-generated value initialization of 2790/// an object of a given type. 2791/// 2792/// Implicit value initializations occur within semantic initializer 2793/// list expressions (InitListExpr) as placeholders for subobject 2794/// initializations not explicitly specified by the user. 2795/// 2796/// \see InitListExpr 2797class ImplicitValueInitExpr : public Expr { 2798public: 2799 explicit ImplicitValueInitExpr(QualType ty) 2800 : Expr(ImplicitValueInitExprClass, ty) { } 2801 2802 /// \brief Construct an empty implicit value initialization. 2803 explicit ImplicitValueInitExpr(EmptyShell Empty) 2804 : Expr(ImplicitValueInitExprClass, Empty) { } 2805 2806 static bool classof(const Stmt *T) { 2807 return T->getStmtClass() == ImplicitValueInitExprClass; 2808 } 2809 static bool classof(const ImplicitValueInitExpr *) { return true; } 2810 2811 virtual SourceRange getSourceRange() const { 2812 return SourceRange(); 2813 } 2814 2815 // Iterators 2816 virtual child_iterator child_begin(); 2817 virtual child_iterator child_end(); 2818}; 2819 2820 2821class ParenListExpr : public Expr { 2822 Stmt **Exprs; 2823 unsigned NumExprs; 2824 SourceLocation LParenLoc, RParenLoc; 2825 2826protected: 2827 virtual void DoDestroy(ASTContext& C); 2828 2829public: 2830 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2831 unsigned numexprs, SourceLocation rparenloc); 2832 2833 ~ParenListExpr() {} 2834 2835 /// \brief Build an empty paren list. 2836 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2837 2838 unsigned getNumExprs() const { return NumExprs; } 2839 2840 const Expr* getExpr(unsigned Init) const { 2841 assert(Init < getNumExprs() && "Initializer access out of range!"); 2842 return cast_or_null<Expr>(Exprs[Init]); 2843 } 2844 2845 Expr* getExpr(unsigned Init) { 2846 assert(Init < getNumExprs() && "Initializer access out of range!"); 2847 return cast_or_null<Expr>(Exprs[Init]); 2848 } 2849 2850 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2851 2852 SourceLocation getLParenLoc() const { return LParenLoc; } 2853 SourceLocation getRParenLoc() const { return RParenLoc; } 2854 2855 virtual SourceRange getSourceRange() const { 2856 return SourceRange(LParenLoc, RParenLoc); 2857 } 2858 static bool classof(const Stmt *T) { 2859 return T->getStmtClass() == ParenListExprClass; 2860 } 2861 static bool classof(const ParenListExpr *) { return true; } 2862 2863 // Iterators 2864 virtual child_iterator child_begin(); 2865 virtual child_iterator child_end(); 2866}; 2867 2868 2869//===----------------------------------------------------------------------===// 2870// Clang Extensions 2871//===----------------------------------------------------------------------===// 2872 2873 2874/// ExtVectorElementExpr - This represents access to specific elements of a 2875/// vector, and may occur on the left hand side or right hand side. For example 2876/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2877/// 2878/// Note that the base may have either vector or pointer to vector type, just 2879/// like a struct field reference. 2880/// 2881class ExtVectorElementExpr : public Expr { 2882 Stmt *Base; 2883 IdentifierInfo *Accessor; 2884 SourceLocation AccessorLoc; 2885public: 2886 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2887 SourceLocation loc) 2888 : Expr(ExtVectorElementExprClass, ty), 2889 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2890 2891 /// \brief Build an empty vector element expression. 2892 explicit ExtVectorElementExpr(EmptyShell Empty) 2893 : Expr(ExtVectorElementExprClass, Empty) { } 2894 2895 const Expr *getBase() const { return cast<Expr>(Base); } 2896 Expr *getBase() { return cast<Expr>(Base); } 2897 void setBase(Expr *E) { Base = E; } 2898 2899 IdentifierInfo &getAccessor() const { return *Accessor; } 2900 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2901 2902 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2903 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2904 2905 /// getNumElements - Get the number of components being selected. 2906 unsigned getNumElements() const; 2907 2908 /// containsDuplicateElements - Return true if any element access is 2909 /// repeated. 2910 bool containsDuplicateElements() const; 2911 2912 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2913 /// aggregate Constant of ConstantInt(s). 2914 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2915 2916 virtual SourceRange getSourceRange() const { 2917 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2918 } 2919 2920 /// isArrow - Return true if the base expression is a pointer to vector, 2921 /// return false if the base expression is a vector. 2922 bool isArrow() const; 2923 2924 static bool classof(const Stmt *T) { 2925 return T->getStmtClass() == ExtVectorElementExprClass; 2926 } 2927 static bool classof(const ExtVectorElementExpr *) { return true; } 2928 2929 // Iterators 2930 virtual child_iterator child_begin(); 2931 virtual child_iterator child_end(); 2932}; 2933 2934 2935/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2936/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2937class BlockExpr : public Expr { 2938protected: 2939 BlockDecl *TheBlock; 2940 bool HasBlockDeclRefExprs; 2941public: 2942 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2943 : Expr(BlockExprClass, ty), 2944 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2945 2946 /// \brief Build an empty block expression. 2947 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2948 2949 const BlockDecl *getBlockDecl() const { return TheBlock; } 2950 BlockDecl *getBlockDecl() { return TheBlock; } 2951 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2952 2953 // Convenience functions for probing the underlying BlockDecl. 2954 SourceLocation getCaretLocation() const; 2955 const Stmt *getBody() const; 2956 Stmt *getBody(); 2957 2958 virtual SourceRange getSourceRange() const { 2959 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2960 } 2961 2962 /// getFunctionType - Return the underlying function type for this block. 2963 const FunctionType *getFunctionType() const; 2964 2965 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2966 /// inside of the block that reference values outside the block. 2967 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2968 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2969 2970 static bool classof(const Stmt *T) { 2971 return T->getStmtClass() == BlockExprClass; 2972 } 2973 static bool classof(const BlockExpr *) { return true; } 2974 2975 // Iterators 2976 virtual child_iterator child_begin(); 2977 virtual child_iterator child_end(); 2978}; 2979 2980/// BlockDeclRefExpr - A reference to a declared variable, function, 2981/// enum, etc. 2982class BlockDeclRefExpr : public Expr { 2983 ValueDecl *D; 2984 SourceLocation Loc; 2985 bool IsByRef : 1; 2986 bool ConstQualAdded : 1; 2987public: 2988 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2989 bool constAdded = false) : 2990 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2991 ConstQualAdded(constAdded) {} 2992 2993 // \brief Build an empty reference to a declared variable in a 2994 // block. 2995 explicit BlockDeclRefExpr(EmptyShell Empty) 2996 : Expr(BlockDeclRefExprClass, Empty) { } 2997 2998 ValueDecl *getDecl() { return D; } 2999 const ValueDecl *getDecl() const { return D; } 3000 void setDecl(ValueDecl *VD) { D = VD; } 3001 3002 SourceLocation getLocation() const { return Loc; } 3003 void setLocation(SourceLocation L) { Loc = L; } 3004 3005 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3006 3007 bool isByRef() const { return IsByRef; } 3008 void setByRef(bool BR) { IsByRef = BR; } 3009 3010 bool isConstQualAdded() const { return ConstQualAdded; } 3011 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3012 3013 static bool classof(const Stmt *T) { 3014 return T->getStmtClass() == BlockDeclRefExprClass; 3015 } 3016 static bool classof(const BlockDeclRefExpr *) { return true; } 3017 3018 // Iterators 3019 virtual child_iterator child_begin(); 3020 virtual child_iterator child_end(); 3021}; 3022 3023} // end namespace clang 3024 3025#endif 3026