Expr.h revision 5cf86ba6b5a724bf91cb52feade1158f1fbeb605
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 "clang/AST/DeclAccessPair.h" 21#include "clang/AST/ASTVector.h" 22#include "clang/AST/UsuallyTinyPtrVector.h" 23#include "llvm/ADT/APSInt.h" 24#include "llvm/ADT/APFloat.h" 25#include "llvm/ADT/SmallVector.h" 26#include "llvm/ADT/StringRef.h" 27#include <vector> 28 29namespace clang { 30 class ASTContext; 31 class APValue; 32 class Decl; 33 class IdentifierInfo; 34 class ParmVarDecl; 35 class NamedDecl; 36 class ValueDecl; 37 class BlockDecl; 38 class CXXBaseSpecifier; 39 class CXXOperatorCallExpr; 40 class CXXMemberCallExpr; 41 class TemplateArgumentLoc; 42 class TemplateArgumentListInfo; 43 44/// \brief A simple array of base specifiers. 45typedef UsuallyTinyPtrVector<const CXXBaseSpecifier> CXXBaseSpecifierArray; 46 47/// Expr - This represents one expression. Note that Expr's are subclasses of 48/// Stmt. This allows an expression to be transparently used any place a Stmt 49/// is required. 50/// 51class Expr : public Stmt { 52 QualType TR; 53 54protected: 55 /// TypeDependent - Whether this expression is type-dependent 56 /// (C++ [temp.dep.expr]). 57 bool TypeDependent : 1; 58 59 /// ValueDependent - Whether this expression is value-dependent 60 /// (C++ [temp.dep.constexpr]). 61 bool ValueDependent : 1; 62 63 Expr(StmtClass SC, QualType T, bool TD, bool VD) 64 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 65 setType(T); 66 } 67 68 /// \brief Construct an empty expression. 69 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 70 71public: 72 /// \brief Increases the reference count for this expression. 73 /// 74 /// Invoke the Retain() operation when this expression 75 /// is being shared by another owner. 76 Expr *Retain() { 77 Stmt::Retain(); 78 return this; 79 } 80 81 QualType getType() const { return TR; } 82 void setType(QualType t) { 83 // In C++, the type of an expression is always adjusted so that it 84 // will not have reference type an expression will never have 85 // reference type (C++ [expr]p6). Use 86 // QualType::getNonReferenceType() to retrieve the non-reference 87 // type. Additionally, inspect Expr::isLvalue to determine whether 88 // an expression that is adjusted in this manner should be 89 // considered an lvalue. 90 assert((t.isNull() || !t->isReferenceType()) && 91 "Expressions can't have reference type"); 92 93 TR = t; 94 } 95 96 /// isValueDependent - Determines whether this expression is 97 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 98 /// array bound of "Chars" in the following example is 99 /// value-dependent. 100 /// @code 101 /// template<int Size, char (&Chars)[Size]> struct meta_string; 102 /// @endcode 103 bool isValueDependent() const { return ValueDependent; } 104 105 /// \brief Set whether this expression is value-dependent or not. 106 void setValueDependent(bool VD) { ValueDependent = VD; } 107 108 /// isTypeDependent - Determines whether this expression is 109 /// type-dependent (C++ [temp.dep.expr]), which means that its type 110 /// could change from one template instantiation to the next. For 111 /// example, the expressions "x" and "x + y" are type-dependent in 112 /// the following code, but "y" is not type-dependent: 113 /// @code 114 /// template<typename T> 115 /// void add(T x, int y) { 116 /// x + y; 117 /// } 118 /// @endcode 119 bool isTypeDependent() const { return TypeDependent; } 120 121 /// \brief Set whether this expression is type-dependent or not. 122 void setTypeDependent(bool TD) { TypeDependent = TD; } 123 124 /// SourceLocation tokens are not useful in isolation - they are low level 125 /// value objects created/interpreted by SourceManager. We assume AST 126 /// clients will have a pointer to the respective SourceManager. 127 virtual SourceRange getSourceRange() const = 0; 128 129 /// getExprLoc - Return the preferred location for the arrow when diagnosing 130 /// a problem with a generic expression. 131 virtual SourceLocation getExprLoc() const { return getLocStart(); } 132 133 /// isUnusedResultAWarning - Return true if this immediate expression should 134 /// be warned about if the result is unused. If so, fill in Loc and Ranges 135 /// with location to warn on and the source range[s] to report with the 136 /// warning. 137 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 138 SourceRange &R2, ASTContext &Ctx) const; 139 140 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 141 /// incomplete type other than void. Nonarray expressions that can be lvalues: 142 /// - name, where name must be a variable 143 /// - e[i] 144 /// - (e), where e must be an lvalue 145 /// - e.name, where e must be an lvalue 146 /// - e->name 147 /// - *e, the type of e cannot be a function type 148 /// - string-constant 149 /// - reference type [C++ [expr]] 150 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 151 /// 152 enum isLvalueResult { 153 LV_Valid, 154 LV_NotObjectType, 155 LV_IncompleteVoidType, 156 LV_DuplicateVectorComponents, 157 LV_InvalidExpression, 158 LV_MemberFunction, 159 LV_SubObjCPropertySetting, 160 LV_ClassTemporary 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 MLV_ClassTemporary 192 }; 193 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 194 SourceLocation *Loc = 0) const; 195 196 /// \brief If this expression refers to a bit-field, retrieve the 197 /// declaration of that bit-field. 198 FieldDecl *getBitField(); 199 200 const FieldDecl *getBitField() const { 201 return const_cast<Expr*>(this)->getBitField(); 202 } 203 204 /// \brief Returns whether this expression refers to a vector element. 205 bool refersToVectorElement() const; 206 207 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 208 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 209 /// but also int expressions which are produced by things like comparisons in 210 /// C. 211 bool isKnownToHaveBooleanValue() const; 212 213 /// isIntegerConstantExpr - Return true if this expression is a valid integer 214 /// constant expression, and, if so, return its value in Result. If not a 215 /// valid i-c-e, return false and fill in Loc (if specified) with the location 216 /// of the invalid expression. 217 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 218 SourceLocation *Loc = 0, 219 bool isEvaluated = true) const; 220 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 221 llvm::APSInt X; 222 return isIntegerConstantExpr(X, Ctx, Loc); 223 } 224 /// isConstantInitializer - Returns true if this expression is a constant 225 /// initializer, which can be emitted at compile-time. 226 bool isConstantInitializer(ASTContext &Ctx) const; 227 228 /// EvalResult is a struct with detailed info about an evaluated expression. 229 struct EvalResult { 230 /// Val - This is the value the expression can be folded to. 231 APValue Val; 232 233 /// HasSideEffects - Whether the evaluated expression has side effects. 234 /// For example, (f() && 0) can be folded, but it still has side effects. 235 bool HasSideEffects; 236 237 /// Diag - If the expression is unfoldable, then Diag contains a note 238 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 239 /// position for the error, and DiagExpr is the expression that caused 240 /// the error. 241 /// If the expression is foldable, but not an integer constant expression, 242 /// Diag contains a note diagnostic that describes why it isn't an integer 243 /// constant expression. If the expression *is* an integer constant 244 /// expression, then Diag will be zero. 245 unsigned Diag; 246 const Expr *DiagExpr; 247 SourceLocation DiagLoc; 248 249 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 250 }; 251 252 /// Evaluate - Return true if this is a constant which we can fold using 253 /// any crazy technique (that has nothing to do with language standards) that 254 /// we want to. If this function returns true, it returns the folded constant 255 /// in Result. 256 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 257 258 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 259 /// stack based objects. 260 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 261 262 /// EvaluateAsBooleanCondition - Return true if this is a constant 263 /// which we we can fold and convert to a boolean condition using 264 /// any crazy technique that we want to. 265 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 266 267 /// isEvaluatable - Call Evaluate to see if this expression can be constant 268 /// folded, but discard the result. 269 bool isEvaluatable(ASTContext &Ctx) const; 270 271 /// HasSideEffects - This routine returns true for all those expressions 272 /// which must be evaluated each time and must not be optimization away 273 /// or evaluated at compile time. Example is a function call, volatile 274 /// variable read. 275 bool HasSideEffects(ASTContext &Ctx) const; 276 277 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 278 /// must be called on an expression that constant folds to an integer. 279 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 280 281 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 282 /// with link time known address. 283 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 284 285 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 286 /// also succeeds on stack based, immutable address lvalues. 287 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 288 289 /// \brief Enumeration used to describe how \c isNullPointerConstant() 290 /// should cope with value-dependent expressions. 291 enum NullPointerConstantValueDependence { 292 /// \brief Specifies that the expression should never be value-dependent. 293 NPC_NeverValueDependent = 0, 294 295 /// \brief Specifies that a value-dependent expression of integral or 296 /// dependent type should be considered a null pointer constant. 297 NPC_ValueDependentIsNull, 298 299 /// \brief Specifies that a value-dependent expression should be considered 300 /// to never be a null pointer constant. 301 NPC_ValueDependentIsNotNull 302 }; 303 304 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 305 /// integer constant expression with the value zero, or if this is one that is 306 /// cast to void*. 307 bool isNullPointerConstant(ASTContext &Ctx, 308 NullPointerConstantValueDependence NPC) const; 309 310 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 311 /// write barrier. 312 bool isOBJCGCCandidate(ASTContext &Ctx) const; 313 314 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 315 /// its subexpression. If that subexpression is also a ParenExpr, 316 /// then this method recursively returns its subexpression, and so forth. 317 /// Otherwise, the method returns the current Expr. 318 Expr *IgnoreParens(); 319 320 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 321 /// or CastExprs, returning their operand. 322 Expr *IgnoreParenCasts(); 323 324 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 325 /// value (including ptr->int casts of the same size). Strip off any 326 /// ParenExpr or CastExprs, returning their operand. 327 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 328 329 /// \brief Determine whether this expression is a default function argument. 330 /// 331 /// Default arguments are implicitly generated in the abstract syntax tree 332 /// by semantic analysis for function calls, object constructions, etc. in 333 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 334 /// this routine also looks through any implicit casts to determine whether 335 /// the expression is a default argument. 336 bool isDefaultArgument() const; 337 338 /// \brief Determine whether this expression directly creates a 339 /// temporary object (of class type). 340 bool isTemporaryObject() const { return getTemporaryObject() != 0; } 341 342 /// \brief If this expression directly creates a temporary object of 343 /// class type, return the expression that actually constructs that 344 /// temporary object. 345 const Expr *getTemporaryObject() const; 346 347 const Expr *IgnoreParens() const { 348 return const_cast<Expr*>(this)->IgnoreParens(); 349 } 350 const Expr *IgnoreParenCasts() const { 351 return const_cast<Expr*>(this)->IgnoreParenCasts(); 352 } 353 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 354 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 355 } 356 357 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 358 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 359 360 static bool classof(const Stmt *T) { 361 return T->getStmtClass() >= firstExprConstant && 362 T->getStmtClass() <= lastExprConstant; 363 } 364 static bool classof(const Expr *) { return true; } 365}; 366 367 368//===----------------------------------------------------------------------===// 369// Primary Expressions. 370//===----------------------------------------------------------------------===// 371 372/// \brief Represents the qualifier that may precede a C++ name, e.g., the 373/// "std::" in "std::sort". 374struct NameQualifier { 375 /// \brief The nested name specifier. 376 NestedNameSpecifier *NNS; 377 378 /// \brief The source range covered by the nested name specifier. 379 SourceRange Range; 380}; 381 382/// \brief Represents an explicit template argument list in C++, e.g., 383/// the "<int>" in "sort<int>". 384struct ExplicitTemplateArgumentList { 385 /// \brief The source location of the left angle bracket ('<'); 386 SourceLocation LAngleLoc; 387 388 /// \brief The source location of the right angle bracket ('>'); 389 SourceLocation RAngleLoc; 390 391 /// \brief The number of template arguments in TemplateArgs. 392 /// The actual template arguments (if any) are stored after the 393 /// ExplicitTemplateArgumentList structure. 394 unsigned NumTemplateArgs; 395 396 /// \brief Retrieve the template arguments 397 TemplateArgumentLoc *getTemplateArgs() { 398 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 399 } 400 401 /// \brief Retrieve the template arguments 402 const TemplateArgumentLoc *getTemplateArgs() const { 403 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 404 } 405 406 void initializeFrom(const TemplateArgumentListInfo &List); 407 void copyInto(TemplateArgumentListInfo &List) const; 408 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 409}; 410 411/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 412/// enum, etc. 413class DeclRefExpr : public Expr { 414 enum { 415 // Flag on DecoratedD that specifies when this declaration reference 416 // expression has a C++ nested-name-specifier. 417 HasQualifierFlag = 0x01, 418 // Flag on DecoratedD that specifies when this declaration reference 419 // expression has an explicit C++ template argument list. 420 HasExplicitTemplateArgumentListFlag = 0x02 421 }; 422 423 // DecoratedD - The declaration that we are referencing, plus two bits to 424 // indicate whether (1) the declaration's name was explicitly qualified and 425 // (2) the declaration's name was followed by an explicit template 426 // argument list. 427 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 428 429 // Loc - The location of the declaration name itself. 430 SourceLocation Loc; 431 432 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 433 NameQualifier *getNameQualifier() { 434 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 435 return 0; 436 437 return reinterpret_cast<NameQualifier *> (this + 1); 438 } 439 440 /// \brief Retrieve the qualifier that preceded the member name, if any. 441 const NameQualifier *getNameQualifier() const { 442 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 443 } 444 445 /// \brief Retrieve the explicit template argument list that followed the 446 /// member template name, if any. 447 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 448 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 449 return 0; 450 451 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 452 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 453 454 return reinterpret_cast<ExplicitTemplateArgumentList *>( 455 getNameQualifier() + 1); 456 } 457 458 /// \brief Retrieve the explicit template argument list that followed the 459 /// member template name, if any. 460 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 461 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 462 } 463 464 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 465 ValueDecl *D, SourceLocation NameLoc, 466 const TemplateArgumentListInfo *TemplateArgs, 467 QualType T); 468 469protected: 470 /// \brief Computes the type- and value-dependence flags for this 471 /// declaration reference expression. 472 void computeDependence(); 473 474 DeclRefExpr(StmtClass SC, ValueDecl *d, QualType t, SourceLocation l) : 475 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 476 computeDependence(); 477 } 478 479public: 480 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 481 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 482 computeDependence(); 483 } 484 485 /// \brief Construct an empty declaration reference expression. 486 explicit DeclRefExpr(EmptyShell Empty) 487 : Expr(DeclRefExprClass, Empty) { } 488 489 static DeclRefExpr *Create(ASTContext &Context, 490 NestedNameSpecifier *Qualifier, 491 SourceRange QualifierRange, 492 ValueDecl *D, 493 SourceLocation NameLoc, 494 QualType T, 495 const TemplateArgumentListInfo *TemplateArgs = 0); 496 497 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 498 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 499 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 500 501 SourceLocation getLocation() const { return Loc; } 502 void setLocation(SourceLocation L) { Loc = L; } 503 virtual SourceRange getSourceRange() const; 504 505 /// \brief Determine whether this declaration reference was preceded by a 506 /// C++ nested-name-specifier, e.g., \c N::foo. 507 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 508 509 /// \brief If the name was qualified, retrieves the source range of 510 /// the nested-name-specifier that precedes the name. Otherwise, 511 /// returns an empty source range. 512 SourceRange getQualifierRange() const { 513 if (!hasQualifier()) 514 return SourceRange(); 515 516 return getNameQualifier()->Range; 517 } 518 519 /// \brief If the name was qualified, retrieves the nested-name-specifier 520 /// that precedes the name. Otherwise, returns NULL. 521 NestedNameSpecifier *getQualifier() const { 522 if (!hasQualifier()) 523 return 0; 524 525 return getNameQualifier()->NNS; 526 } 527 528 /// \brief Determines whether this member expression actually had a C++ 529 /// template argument list explicitly specified, e.g., x.f<int>. 530 bool hasExplicitTemplateArgumentList() const { 531 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 532 } 533 534 /// \brief Copies the template arguments (if present) into the given 535 /// structure. 536 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 537 if (hasExplicitTemplateArgumentList()) 538 getExplicitTemplateArgumentList()->copyInto(List); 539 } 540 541 /// \brief Retrieve the location of the left angle bracket following the 542 /// member name ('<'), if any. 543 SourceLocation getLAngleLoc() const { 544 if (!hasExplicitTemplateArgumentList()) 545 return SourceLocation(); 546 547 return getExplicitTemplateArgumentList()->LAngleLoc; 548 } 549 550 /// \brief Retrieve the template arguments provided as part of this 551 /// template-id. 552 const TemplateArgumentLoc *getTemplateArgs() const { 553 if (!hasExplicitTemplateArgumentList()) 554 return 0; 555 556 return getExplicitTemplateArgumentList()->getTemplateArgs(); 557 } 558 559 /// \brief Retrieve the number of template arguments provided as part of this 560 /// template-id. 561 unsigned getNumTemplateArgs() const { 562 if (!hasExplicitTemplateArgumentList()) 563 return 0; 564 565 return getExplicitTemplateArgumentList()->NumTemplateArgs; 566 } 567 568 /// \brief Retrieve the location of the right angle bracket following the 569 /// template arguments ('>'). 570 SourceLocation getRAngleLoc() const { 571 if (!hasExplicitTemplateArgumentList()) 572 return SourceLocation(); 573 574 return getExplicitTemplateArgumentList()->RAngleLoc; 575 } 576 577 static bool classof(const Stmt *T) { 578 return T->getStmtClass() == DeclRefExprClass; 579 } 580 static bool classof(const DeclRefExpr *) { return true; } 581 582 // Iterators 583 virtual child_iterator child_begin(); 584 virtual child_iterator child_end(); 585}; 586 587/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 588class PredefinedExpr : public Expr { 589public: 590 enum IdentType { 591 Func, 592 Function, 593 PrettyFunction, 594 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 595 /// 'virtual' keyword is omitted for virtual member functions. 596 PrettyFunctionNoVirtual 597 }; 598 599private: 600 SourceLocation Loc; 601 IdentType Type; 602public: 603 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 604 : Expr(PredefinedExprClass, type, type->isDependentType(), 605 type->isDependentType()), Loc(l), Type(IT) {} 606 607 /// \brief Construct an empty predefined expression. 608 explicit PredefinedExpr(EmptyShell Empty) 609 : Expr(PredefinedExprClass, Empty) { } 610 611 IdentType getIdentType() const { return Type; } 612 void setIdentType(IdentType IT) { Type = IT; } 613 614 SourceLocation getLocation() const { return Loc; } 615 void setLocation(SourceLocation L) { Loc = L; } 616 617 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 618 619 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 620 621 static bool classof(const Stmt *T) { 622 return T->getStmtClass() == PredefinedExprClass; 623 } 624 static bool classof(const PredefinedExpr *) { return true; } 625 626 // Iterators 627 virtual child_iterator child_begin(); 628 virtual child_iterator child_end(); 629}; 630 631class IntegerLiteral : public Expr { 632 llvm::APInt Value; 633 SourceLocation Loc; 634public: 635 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 636 // or UnsignedLongLongTy 637 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 638 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 639 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 640 } 641 642 /// \brief Construct an empty integer literal. 643 explicit IntegerLiteral(EmptyShell Empty) 644 : Expr(IntegerLiteralClass, Empty) { } 645 646 const llvm::APInt &getValue() const { return Value; } 647 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 648 649 /// \brief Retrieve the location of the literal. 650 SourceLocation getLocation() const { return Loc; } 651 652 void setValue(const llvm::APInt &Val) { Value = Val; } 653 void setLocation(SourceLocation Location) { Loc = Location; } 654 655 static bool classof(const Stmt *T) { 656 return T->getStmtClass() == IntegerLiteralClass; 657 } 658 static bool classof(const IntegerLiteral *) { return true; } 659 660 // Iterators 661 virtual child_iterator child_begin(); 662 virtual child_iterator child_end(); 663}; 664 665class CharacterLiteral : public Expr { 666 unsigned Value; 667 SourceLocation Loc; 668 bool IsWide; 669public: 670 // type should be IntTy 671 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 672 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 673 IsWide(iswide) { 674 } 675 676 /// \brief Construct an empty character literal. 677 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 678 679 SourceLocation getLocation() const { return Loc; } 680 bool isWide() const { return IsWide; } 681 682 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 683 684 unsigned getValue() const { return Value; } 685 686 void setLocation(SourceLocation Location) { Loc = Location; } 687 void setWide(bool W) { IsWide = W; } 688 void setValue(unsigned Val) { Value = Val; } 689 690 static bool classof(const Stmt *T) { 691 return T->getStmtClass() == CharacterLiteralClass; 692 } 693 static bool classof(const CharacterLiteral *) { return true; } 694 695 // Iterators 696 virtual child_iterator child_begin(); 697 virtual child_iterator child_end(); 698}; 699 700class FloatingLiteral : public Expr { 701 llvm::APFloat Value; 702 bool IsExact : 1; 703 SourceLocation Loc; 704public: 705 FloatingLiteral(const llvm::APFloat &V, bool isexact, 706 QualType Type, SourceLocation L) 707 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 708 IsExact(isexact), Loc(L) {} 709 710 /// \brief Construct an empty floating-point literal. 711 explicit FloatingLiteral(EmptyShell Empty) 712 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 713 714 const llvm::APFloat &getValue() const { return Value; } 715 void setValue(const llvm::APFloat &Val) { Value = Val; } 716 717 bool isExact() const { return IsExact; } 718 void setExact(bool E) { IsExact = E; } 719 720 /// getValueAsApproximateDouble - This returns the value as an inaccurate 721 /// double. Note that this may cause loss of precision, but is useful for 722 /// debugging dumps, etc. 723 double getValueAsApproximateDouble() const; 724 725 SourceLocation getLocation() const { return Loc; } 726 void setLocation(SourceLocation L) { Loc = L; } 727 728 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 729 730 static bool classof(const Stmt *T) { 731 return T->getStmtClass() == FloatingLiteralClass; 732 } 733 static bool classof(const FloatingLiteral *) { return true; } 734 735 // Iterators 736 virtual child_iterator child_begin(); 737 virtual child_iterator child_end(); 738}; 739 740/// ImaginaryLiteral - We support imaginary integer and floating point literals, 741/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 742/// IntegerLiteral classes. Instances of this class always have a Complex type 743/// whose element type matches the subexpression. 744/// 745class ImaginaryLiteral : public Expr { 746 Stmt *Val; 747public: 748 ImaginaryLiteral(Expr *val, QualType Ty) 749 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 750 751 /// \brief Build an empty imaginary literal. 752 explicit ImaginaryLiteral(EmptyShell Empty) 753 : Expr(ImaginaryLiteralClass, Empty) { } 754 755 const Expr *getSubExpr() const { return cast<Expr>(Val); } 756 Expr *getSubExpr() { return cast<Expr>(Val); } 757 void setSubExpr(Expr *E) { Val = E; } 758 759 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 760 static bool classof(const Stmt *T) { 761 return T->getStmtClass() == ImaginaryLiteralClass; 762 } 763 static bool classof(const ImaginaryLiteral *) { return true; } 764 765 // Iterators 766 virtual child_iterator child_begin(); 767 virtual child_iterator child_end(); 768}; 769 770/// StringLiteral - This represents a string literal expression, e.g. "foo" 771/// or L"bar" (wide strings). The actual string is returned by getStrData() 772/// is NOT null-terminated, and the length of the string is determined by 773/// calling getByteLength(). The C type for a string is always a 774/// ConstantArrayType. In C++, the char type is const qualified, in C it is 775/// not. 776/// 777/// Note that strings in C can be formed by concatenation of multiple string 778/// literal pptokens in translation phase #6. This keeps track of the locations 779/// of each of these pieces. 780/// 781/// Strings in C can also be truncated and extended by assigning into arrays, 782/// e.g. with constructs like: 783/// char X[2] = "foobar"; 784/// In this case, getByteLength() will return 6, but the string literal will 785/// have type "char[2]". 786class StringLiteral : public Expr { 787 const char *StrData; 788 unsigned ByteLength; 789 bool IsWide; 790 unsigned NumConcatenated; 791 SourceLocation TokLocs[1]; 792 793 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 794 795protected: 796 virtual void DoDestroy(ASTContext &C); 797 798public: 799 /// This is the "fully general" constructor that allows representation of 800 /// strings formed from multiple concatenated tokens. 801 static StringLiteral *Create(ASTContext &C, const char *StrData, 802 unsigned ByteLength, bool Wide, QualType Ty, 803 const SourceLocation *Loc, unsigned NumStrs); 804 805 /// Simple constructor for string literals made from one token. 806 static StringLiteral *Create(ASTContext &C, const char *StrData, 807 unsigned ByteLength, 808 bool Wide, QualType Ty, SourceLocation Loc) { 809 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 810 } 811 812 /// \brief Construct an empty string literal. 813 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 814 815 llvm::StringRef getString() const { 816 return llvm::StringRef(StrData, ByteLength); 817 } 818 // FIXME: These are deprecated, replace with StringRef. 819 const char *getStrData() const { return StrData; } 820 unsigned getByteLength() const { return ByteLength; } 821 822 /// \brief Sets the string data to the given string data. 823 void setString(ASTContext &C, llvm::StringRef Str); 824 825 bool isWide() const { return IsWide; } 826 void setWide(bool W) { IsWide = W; } 827 828 bool containsNonAsciiOrNull() const { 829 llvm::StringRef Str = getString(); 830 for (unsigned i = 0, e = Str.size(); i != e; ++i) 831 if (!isascii(Str[i]) || !Str[i]) 832 return true; 833 return false; 834 } 835 /// getNumConcatenated - Get the number of string literal tokens that were 836 /// concatenated in translation phase #6 to form this string literal. 837 unsigned getNumConcatenated() const { return NumConcatenated; } 838 839 SourceLocation getStrTokenLoc(unsigned TokNum) const { 840 assert(TokNum < NumConcatenated && "Invalid tok number"); 841 return TokLocs[TokNum]; 842 } 843 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 844 assert(TokNum < NumConcatenated && "Invalid tok number"); 845 TokLocs[TokNum] = L; 846 } 847 848 typedef const SourceLocation *tokloc_iterator; 849 tokloc_iterator tokloc_begin() const { return TokLocs; } 850 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 851 852 virtual SourceRange getSourceRange() const { 853 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 854 } 855 static bool classof(const Stmt *T) { 856 return T->getStmtClass() == StringLiteralClass; 857 } 858 static bool classof(const StringLiteral *) { return true; } 859 860 // Iterators 861 virtual child_iterator child_begin(); 862 virtual child_iterator child_end(); 863}; 864 865/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 866/// AST node is only formed if full location information is requested. 867class ParenExpr : public Expr { 868 SourceLocation L, R; 869 Stmt *Val; 870public: 871 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 872 : Expr(ParenExprClass, val->getType(), 873 val->isTypeDependent(), val->isValueDependent()), 874 L(l), R(r), Val(val) {} 875 876 /// \brief Construct an empty parenthesized expression. 877 explicit ParenExpr(EmptyShell Empty) 878 : Expr(ParenExprClass, Empty) { } 879 880 const Expr *getSubExpr() const { return cast<Expr>(Val); } 881 Expr *getSubExpr() { return cast<Expr>(Val); } 882 void setSubExpr(Expr *E) { Val = E; } 883 884 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 885 886 /// \brief Get the location of the left parentheses '('. 887 SourceLocation getLParen() const { return L; } 888 void setLParen(SourceLocation Loc) { L = Loc; } 889 890 /// \brief Get the location of the right parentheses ')'. 891 SourceLocation getRParen() const { return R; } 892 void setRParen(SourceLocation Loc) { R = Loc; } 893 894 static bool classof(const Stmt *T) { 895 return T->getStmtClass() == ParenExprClass; 896 } 897 static bool classof(const ParenExpr *) { return true; } 898 899 // Iterators 900 virtual child_iterator child_begin(); 901 virtual child_iterator child_end(); 902}; 903 904 905/// UnaryOperator - This represents the unary-expression's (except sizeof and 906/// alignof), the postinc/postdec operators from postfix-expression, and various 907/// extensions. 908/// 909/// Notes on various nodes: 910/// 911/// Real/Imag - These return the real/imag part of a complex operand. If 912/// applied to a non-complex value, the former returns its operand and the 913/// later returns zero in the type of the operand. 914/// 915/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 916/// subexpression is a compound literal with the various MemberExpr and 917/// ArraySubscriptExpr's applied to it. 918/// 919class UnaryOperator : public Expr { 920public: 921 // Note that additions to this should also update the StmtVisitor class. 922 enum Opcode { 923 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 924 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 925 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 926 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 927 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 928 Real, Imag, // "__real expr"/"__imag expr" Extension. 929 Extension, // __extension__ marker. 930 OffsetOf // __builtin_offsetof 931 }; 932private: 933 Stmt *Val; 934 Opcode Opc; 935 SourceLocation Loc; 936public: 937 938 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 939 : Expr(UnaryOperatorClass, type, 940 input->isTypeDependent() && opc != OffsetOf, 941 input->isValueDependent()), 942 Val(input), Opc(opc), Loc(l) {} 943 944 /// \brief Build an empty unary operator. 945 explicit UnaryOperator(EmptyShell Empty) 946 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 947 948 Opcode getOpcode() const { return Opc; } 949 void setOpcode(Opcode O) { Opc = O; } 950 951 Expr *getSubExpr() const { return cast<Expr>(Val); } 952 void setSubExpr(Expr *E) { Val = E; } 953 954 /// getOperatorLoc - Return the location of the operator. 955 SourceLocation getOperatorLoc() const { return Loc; } 956 void setOperatorLoc(SourceLocation L) { Loc = L; } 957 958 /// isPostfix - Return true if this is a postfix operation, like x++. 959 static bool isPostfix(Opcode Op) { 960 return Op == PostInc || Op == PostDec; 961 } 962 963 /// isPostfix - Return true if this is a prefix operation, like --x. 964 static bool isPrefix(Opcode Op) { 965 return Op == PreInc || Op == PreDec; 966 } 967 968 bool isPrefix() const { return isPrefix(Opc); } 969 bool isPostfix() const { return isPostfix(Opc); } 970 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 971 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 972 bool isOffsetOfOp() const { return Opc == OffsetOf; } 973 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 974 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 975 976 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 977 /// corresponds to, e.g. "sizeof" or "[pre]++" 978 static const char *getOpcodeStr(Opcode Op); 979 980 /// \brief Retrieve the unary opcode that corresponds to the given 981 /// overloaded operator. 982 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 983 984 /// \brief Retrieve the overloaded operator kind that corresponds to 985 /// the given unary opcode. 986 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 987 988 virtual SourceRange getSourceRange() const { 989 if (isPostfix()) 990 return SourceRange(Val->getLocStart(), Loc); 991 else 992 return SourceRange(Loc, Val->getLocEnd()); 993 } 994 virtual SourceLocation getExprLoc() const { return Loc; } 995 996 static bool classof(const Stmt *T) { 997 return T->getStmtClass() == UnaryOperatorClass; 998 } 999 static bool classof(const UnaryOperator *) { return true; } 1000 1001 // Iterators 1002 virtual child_iterator child_begin(); 1003 virtual child_iterator child_end(); 1004}; 1005 1006/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1007/// types and expressions. 1008class SizeOfAlignOfExpr : public Expr { 1009 bool isSizeof : 1; // true if sizeof, false if alignof. 1010 bool isType : 1; // true if operand is a type, false if an expression 1011 union { 1012 TypeSourceInfo *Ty; 1013 Stmt *Ex; 1014 } Argument; 1015 SourceLocation OpLoc, RParenLoc; 1016 1017protected: 1018 virtual void DoDestroy(ASTContext& C); 1019 1020public: 1021 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1022 QualType resultType, SourceLocation op, 1023 SourceLocation rp) : 1024 Expr(SizeOfAlignOfExprClass, resultType, 1025 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1026 // Value-dependent if the argument is type-dependent. 1027 TInfo->getType()->isDependentType()), 1028 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1029 Argument.Ty = TInfo; 1030 } 1031 1032 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1033 QualType resultType, SourceLocation op, 1034 SourceLocation rp) : 1035 Expr(SizeOfAlignOfExprClass, resultType, 1036 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1037 // Value-dependent if the argument is type-dependent. 1038 E->isTypeDependent()), 1039 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1040 Argument.Ex = E; 1041 } 1042 1043 /// \brief Construct an empty sizeof/alignof expression. 1044 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1045 : Expr(SizeOfAlignOfExprClass, Empty) { } 1046 1047 bool isSizeOf() const { return isSizeof; } 1048 void setSizeof(bool S) { isSizeof = S; } 1049 1050 bool isArgumentType() const { return isType; } 1051 QualType getArgumentType() const { 1052 return getArgumentTypeInfo()->getType(); 1053 } 1054 TypeSourceInfo *getArgumentTypeInfo() const { 1055 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1056 return Argument.Ty; 1057 } 1058 Expr *getArgumentExpr() { 1059 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1060 return static_cast<Expr*>(Argument.Ex); 1061 } 1062 const Expr *getArgumentExpr() const { 1063 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1064 } 1065 1066 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1067 void setArgument(TypeSourceInfo *TInfo) { 1068 Argument.Ty = TInfo; 1069 isType = true; 1070 } 1071 1072 /// Gets the argument type, or the type of the argument expression, whichever 1073 /// is appropriate. 1074 QualType getTypeOfArgument() const { 1075 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1076 } 1077 1078 SourceLocation getOperatorLoc() const { return OpLoc; } 1079 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1080 1081 SourceLocation getRParenLoc() const { return RParenLoc; } 1082 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1083 1084 virtual SourceRange getSourceRange() const { 1085 return SourceRange(OpLoc, RParenLoc); 1086 } 1087 1088 static bool classof(const Stmt *T) { 1089 return T->getStmtClass() == SizeOfAlignOfExprClass; 1090 } 1091 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1092 1093 // Iterators 1094 virtual child_iterator child_begin(); 1095 virtual child_iterator child_end(); 1096}; 1097 1098//===----------------------------------------------------------------------===// 1099// Postfix Operators. 1100//===----------------------------------------------------------------------===// 1101 1102/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1103class ArraySubscriptExpr : public Expr { 1104 enum { LHS, RHS, END_EXPR=2 }; 1105 Stmt* SubExprs[END_EXPR]; 1106 SourceLocation RBracketLoc; 1107public: 1108 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1109 SourceLocation rbracketloc) 1110 : Expr(ArraySubscriptExprClass, t, 1111 lhs->isTypeDependent() || rhs->isTypeDependent(), 1112 lhs->isValueDependent() || rhs->isValueDependent()), 1113 RBracketLoc(rbracketloc) { 1114 SubExprs[LHS] = lhs; 1115 SubExprs[RHS] = rhs; 1116 } 1117 1118 /// \brief Create an empty array subscript expression. 1119 explicit ArraySubscriptExpr(EmptyShell Shell) 1120 : Expr(ArraySubscriptExprClass, Shell) { } 1121 1122 /// An array access can be written A[4] or 4[A] (both are equivalent). 1123 /// - getBase() and getIdx() always present the normalized view: A[4]. 1124 /// In this case getBase() returns "A" and getIdx() returns "4". 1125 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1126 /// 4[A] getLHS() returns "4". 1127 /// Note: Because vector element access is also written A[4] we must 1128 /// predicate the format conversion in getBase and getIdx only on the 1129 /// the type of the RHS, as it is possible for the LHS to be a vector of 1130 /// integer type 1131 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1132 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1133 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1134 1135 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1136 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1137 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1138 1139 Expr *getBase() { 1140 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1141 } 1142 1143 const Expr *getBase() const { 1144 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1145 } 1146 1147 Expr *getIdx() { 1148 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1149 } 1150 1151 const Expr *getIdx() const { 1152 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1153 } 1154 1155 virtual SourceRange getSourceRange() const { 1156 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1157 } 1158 1159 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1160 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1161 1162 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1163 1164 static bool classof(const Stmt *T) { 1165 return T->getStmtClass() == ArraySubscriptExprClass; 1166 } 1167 static bool classof(const ArraySubscriptExpr *) { return true; } 1168 1169 // Iterators 1170 virtual child_iterator child_begin(); 1171 virtual child_iterator child_end(); 1172}; 1173 1174 1175/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1176/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1177/// while its subclasses may represent alternative syntax that (semantically) 1178/// results in a function call. For example, CXXOperatorCallExpr is 1179/// a subclass for overloaded operator calls that use operator syntax, e.g., 1180/// "str1 + str2" to resolve to a function call. 1181class CallExpr : public Expr { 1182 enum { FN=0, ARGS_START=1 }; 1183 Stmt **SubExprs; 1184 unsigned NumArgs; 1185 SourceLocation RParenLoc; 1186 1187protected: 1188 // This version of the constructor is for derived classes. 1189 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1190 QualType t, SourceLocation rparenloc); 1191 1192 virtual void DoDestroy(ASTContext& C); 1193 1194public: 1195 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1196 SourceLocation rparenloc); 1197 1198 /// \brief Build an empty call expression. 1199 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1200 1201 ~CallExpr() {} 1202 1203 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1204 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1205 void setCallee(Expr *F) { SubExprs[FN] = F; } 1206 1207 Decl *getCalleeDecl(); 1208 const Decl *getCalleeDecl() const { 1209 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1210 } 1211 1212 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1213 FunctionDecl *getDirectCallee(); 1214 const FunctionDecl *getDirectCallee() const { 1215 return const_cast<CallExpr*>(this)->getDirectCallee(); 1216 } 1217 1218 /// getNumArgs - Return the number of actual arguments to this call. 1219 /// 1220 unsigned getNumArgs() const { return NumArgs; } 1221 1222 /// getArg - Return the specified argument. 1223 Expr *getArg(unsigned Arg) { 1224 assert(Arg < NumArgs && "Arg access out of range!"); 1225 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1226 } 1227 const Expr *getArg(unsigned Arg) const { 1228 assert(Arg < NumArgs && "Arg access out of range!"); 1229 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1230 } 1231 1232 /// setArg - Set the specified argument. 1233 void setArg(unsigned Arg, Expr *ArgExpr) { 1234 assert(Arg < NumArgs && "Arg access out of range!"); 1235 SubExprs[Arg+ARGS_START] = ArgExpr; 1236 } 1237 1238 /// setNumArgs - This changes the number of arguments present in this call. 1239 /// Any orphaned expressions are deleted by this, and any new operands are set 1240 /// to null. 1241 void setNumArgs(ASTContext& C, unsigned NumArgs); 1242 1243 typedef ExprIterator arg_iterator; 1244 typedef ConstExprIterator const_arg_iterator; 1245 1246 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1247 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1248 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1249 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1250 1251 /// getNumCommas - Return the number of commas that must have been present in 1252 /// this function call. 1253 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1254 1255 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1256 /// not, return 0. 1257 unsigned isBuiltinCall(ASTContext &Context) const; 1258 1259 /// getCallReturnType - Get the return type of the call expr. This is not 1260 /// always the type of the expr itself, if the return type is a reference 1261 /// type. 1262 QualType getCallReturnType() const; 1263 1264 SourceLocation getRParenLoc() const { return RParenLoc; } 1265 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1266 1267 virtual SourceRange getSourceRange() const { 1268 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1269 } 1270 1271 static bool classof(const Stmt *T) { 1272 return T->getStmtClass() == CallExprClass || 1273 T->getStmtClass() == CXXOperatorCallExprClass || 1274 T->getStmtClass() == CXXMemberCallExprClass; 1275 } 1276 static bool classof(const CallExpr *) { return true; } 1277 static bool classof(const CXXOperatorCallExpr *) { return true; } 1278 static bool classof(const CXXMemberCallExpr *) { return true; } 1279 1280 // Iterators 1281 virtual child_iterator child_begin(); 1282 virtual child_iterator child_end(); 1283}; 1284 1285/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1286/// 1287class MemberExpr : public Expr { 1288 /// Extra data stored in some member expressions. 1289 struct MemberNameQualifier : public NameQualifier { 1290 DeclAccessPair FoundDecl; 1291 }; 1292 1293 /// Base - the expression for the base pointer or structure references. In 1294 /// X.F, this is "X". 1295 Stmt *Base; 1296 1297 /// MemberDecl - This is the decl being referenced by the field/member name. 1298 /// In X.F, this is the decl referenced by F. 1299 ValueDecl *MemberDecl; 1300 1301 /// MemberLoc - This is the location of the member name. 1302 SourceLocation MemberLoc; 1303 1304 /// IsArrow - True if this is "X->F", false if this is "X.F". 1305 bool IsArrow : 1; 1306 1307 /// \brief True if this member expression used a nested-name-specifier to 1308 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1309 /// declaration. When true, a MemberNameQualifier 1310 /// structure is allocated immediately after the MemberExpr. 1311 bool HasQualifierOrFoundDecl : 1; 1312 1313 /// \brief True if this member expression specified a template argument list 1314 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1315 /// structure (and its TemplateArguments) are allocated immediately after 1316 /// the MemberExpr or, if the member expression also has a qualifier, after 1317 /// the MemberNameQualifier structure. 1318 bool HasExplicitTemplateArgumentList : 1; 1319 1320 /// \brief Retrieve the qualifier that preceded the member name, if any. 1321 MemberNameQualifier *getMemberQualifier() { 1322 assert(HasQualifierOrFoundDecl); 1323 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1324 } 1325 1326 /// \brief Retrieve the qualifier that preceded the member name, if any. 1327 const MemberNameQualifier *getMemberQualifier() const { 1328 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1329 } 1330 1331 /// \brief Retrieve the explicit template argument list that followed the 1332 /// member template name, if any. 1333 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1334 if (!HasExplicitTemplateArgumentList) 1335 return 0; 1336 1337 if (!HasQualifierOrFoundDecl) 1338 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1339 1340 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1341 getMemberQualifier() + 1); 1342 } 1343 1344 /// \brief Retrieve the explicit template argument list that followed the 1345 /// member template name, if any. 1346 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1347 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1348 } 1349 1350public: 1351 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1352 SourceLocation l, QualType ty) 1353 : Expr(MemberExprClass, ty, 1354 base->isTypeDependent(), base->isValueDependent()), 1355 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1356 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1357 1358 /// \brief Build an empty member reference expression. 1359 explicit MemberExpr(EmptyShell Empty) 1360 : Expr(MemberExprClass, Empty), HasQualifierOrFoundDecl(false), 1361 HasExplicitTemplateArgumentList(false) { } 1362 1363 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1364 NestedNameSpecifier *qual, SourceRange qualrange, 1365 ValueDecl *memberdecl, DeclAccessPair founddecl, 1366 SourceLocation l, 1367 const TemplateArgumentListInfo *targs, 1368 QualType ty); 1369 1370 void setBase(Expr *E) { Base = E; } 1371 Expr *getBase() const { return cast<Expr>(Base); } 1372 1373 /// \brief Retrieve the member declaration to which this expression refers. 1374 /// 1375 /// The returned declaration will either be a FieldDecl or (in C++) 1376 /// a CXXMethodDecl. 1377 ValueDecl *getMemberDecl() const { return MemberDecl; } 1378 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1379 1380 /// \brief Retrieves the declaration found by lookup. 1381 DeclAccessPair getFoundDecl() const { 1382 if (!HasQualifierOrFoundDecl) 1383 return DeclAccessPair::make(getMemberDecl(), 1384 getMemberDecl()->getAccess()); 1385 return getMemberQualifier()->FoundDecl; 1386 } 1387 1388 /// \brief Determines whether this member expression actually had 1389 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1390 /// x->Base::foo. 1391 bool hasQualifier() const { return getQualifier() != 0; } 1392 1393 /// \brief If the member name was qualified, retrieves the source range of 1394 /// the nested-name-specifier that precedes the member name. Otherwise, 1395 /// returns an empty source range. 1396 SourceRange getQualifierRange() const { 1397 if (!HasQualifierOrFoundDecl) 1398 return SourceRange(); 1399 1400 return getMemberQualifier()->Range; 1401 } 1402 1403 /// \brief If the member name was qualified, retrieves the 1404 /// nested-name-specifier that precedes the member name. Otherwise, returns 1405 /// NULL. 1406 NestedNameSpecifier *getQualifier() const { 1407 if (!HasQualifierOrFoundDecl) 1408 return 0; 1409 1410 return getMemberQualifier()->NNS; 1411 } 1412 1413 /// \brief Determines whether this member expression actually had a C++ 1414 /// template argument list explicitly specified, e.g., x.f<int>. 1415 bool hasExplicitTemplateArgumentList() const { 1416 return HasExplicitTemplateArgumentList; 1417 } 1418 1419 /// \brief Copies the template arguments (if present) into the given 1420 /// structure. 1421 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1422 if (hasExplicitTemplateArgumentList()) 1423 getExplicitTemplateArgumentList()->copyInto(List); 1424 } 1425 1426 /// \brief Retrieve the location of the left angle bracket following the 1427 /// member name ('<'), if any. 1428 SourceLocation getLAngleLoc() const { 1429 if (!HasExplicitTemplateArgumentList) 1430 return SourceLocation(); 1431 1432 return getExplicitTemplateArgumentList()->LAngleLoc; 1433 } 1434 1435 /// \brief Retrieve the template arguments provided as part of this 1436 /// template-id. 1437 const TemplateArgumentLoc *getTemplateArgs() const { 1438 if (!HasExplicitTemplateArgumentList) 1439 return 0; 1440 1441 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1442 } 1443 1444 /// \brief Retrieve the number of template arguments provided as part of this 1445 /// template-id. 1446 unsigned getNumTemplateArgs() const { 1447 if (!HasExplicitTemplateArgumentList) 1448 return 0; 1449 1450 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1451 } 1452 1453 /// \brief Retrieve the location of the right angle bracket following the 1454 /// template arguments ('>'). 1455 SourceLocation getRAngleLoc() const { 1456 if (!HasExplicitTemplateArgumentList) 1457 return SourceLocation(); 1458 1459 return getExplicitTemplateArgumentList()->RAngleLoc; 1460 } 1461 1462 bool isArrow() const { return IsArrow; } 1463 void setArrow(bool A) { IsArrow = A; } 1464 1465 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1466 /// location of 'F'. 1467 SourceLocation getMemberLoc() const { return MemberLoc; } 1468 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1469 1470 virtual SourceRange getSourceRange() const { 1471 // If we have an implicit base (like a C++ implicit this), 1472 // make sure not to return its location 1473 SourceLocation EndLoc = MemberLoc; 1474 if (HasExplicitTemplateArgumentList) 1475 EndLoc = getRAngleLoc(); 1476 1477 SourceLocation BaseLoc = getBase()->getLocStart(); 1478 if (BaseLoc.isInvalid()) 1479 return SourceRange(MemberLoc, EndLoc); 1480 return SourceRange(BaseLoc, EndLoc); 1481 } 1482 1483 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1484 1485 static bool classof(const Stmt *T) { 1486 return T->getStmtClass() == MemberExprClass; 1487 } 1488 static bool classof(const MemberExpr *) { return true; } 1489 1490 // Iterators 1491 virtual child_iterator child_begin(); 1492 virtual child_iterator child_end(); 1493}; 1494 1495/// CompoundLiteralExpr - [C99 6.5.2.5] 1496/// 1497class CompoundLiteralExpr : public Expr { 1498 /// LParenLoc - If non-null, this is the location of the left paren in a 1499 /// compound literal like "(int){4}". This can be null if this is a 1500 /// synthesized compound expression. 1501 SourceLocation LParenLoc; 1502 1503 /// The type as written. This can be an incomplete array type, in 1504 /// which case the actual expression type will be different. 1505 TypeSourceInfo *TInfo; 1506 Stmt *Init; 1507 bool FileScope; 1508public: 1509 // FIXME: Can compound literals be value-dependent? 1510 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1511 QualType T, Expr *init, bool fileScope) 1512 : Expr(CompoundLiteralExprClass, T, 1513 tinfo->getType()->isDependentType(), false), 1514 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1515 1516 /// \brief Construct an empty compound literal. 1517 explicit CompoundLiteralExpr(EmptyShell Empty) 1518 : Expr(CompoundLiteralExprClass, Empty) { } 1519 1520 const Expr *getInitializer() const { return cast<Expr>(Init); } 1521 Expr *getInitializer() { return cast<Expr>(Init); } 1522 void setInitializer(Expr *E) { Init = E; } 1523 1524 bool isFileScope() const { return FileScope; } 1525 void setFileScope(bool FS) { FileScope = FS; } 1526 1527 SourceLocation getLParenLoc() const { return LParenLoc; } 1528 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1529 1530 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1531 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1532 1533 virtual SourceRange getSourceRange() const { 1534 // FIXME: Init should never be null. 1535 if (!Init) 1536 return SourceRange(); 1537 if (LParenLoc.isInvalid()) 1538 return Init->getSourceRange(); 1539 return SourceRange(LParenLoc, Init->getLocEnd()); 1540 } 1541 1542 static bool classof(const Stmt *T) { 1543 return T->getStmtClass() == CompoundLiteralExprClass; 1544 } 1545 static bool classof(const CompoundLiteralExpr *) { return true; } 1546 1547 // Iterators 1548 virtual child_iterator child_begin(); 1549 virtual child_iterator child_end(); 1550}; 1551 1552/// CastExpr - Base class for type casts, including both implicit 1553/// casts (ImplicitCastExpr) and explicit casts that have some 1554/// representation in the source code (ExplicitCastExpr's derived 1555/// classes). 1556class CastExpr : public Expr { 1557public: 1558 /// CastKind - the kind of cast this represents. 1559 enum CastKind { 1560 /// CK_Unknown - Unknown cast kind. 1561 /// FIXME: The goal is to get rid of this and make all casts have a 1562 /// kind so that the AST client doesn't have to try to figure out what's 1563 /// going on. 1564 CK_Unknown, 1565 1566 /// CK_BitCast - Used for reinterpret_cast. 1567 CK_BitCast, 1568 1569 /// CK_NoOp - Used for const_cast. 1570 CK_NoOp, 1571 1572 /// CK_BaseToDerived - Base to derived class casts. 1573 CK_BaseToDerived, 1574 1575 /// CK_DerivedToBase - Derived to base class casts. 1576 CK_DerivedToBase, 1577 1578 /// CK_UncheckedDerivedToBase - Derived to base class casts that 1579 /// assume that the derived pointer is not null. 1580 CK_UncheckedDerivedToBase, 1581 1582 /// CK_Dynamic - Dynamic cast. 1583 CK_Dynamic, 1584 1585 /// CK_ToUnion - Cast to union (GCC extension). 1586 CK_ToUnion, 1587 1588 /// CK_ArrayToPointerDecay - Array to pointer decay. 1589 CK_ArrayToPointerDecay, 1590 1591 // CK_FunctionToPointerDecay - Function to pointer decay. 1592 CK_FunctionToPointerDecay, 1593 1594 /// CK_NullToMemberPointer - Null pointer to member pointer. 1595 CK_NullToMemberPointer, 1596 1597 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1598 /// member pointer in derived class. 1599 CK_BaseToDerivedMemberPointer, 1600 1601 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1602 /// member pointer in base class. 1603 CK_DerivedToBaseMemberPointer, 1604 1605 /// CK_UserDefinedConversion - Conversion using a user defined type 1606 /// conversion function. 1607 CK_UserDefinedConversion, 1608 1609 /// CK_ConstructorConversion - Conversion by constructor 1610 CK_ConstructorConversion, 1611 1612 /// CK_IntegralToPointer - Integral to pointer 1613 CK_IntegralToPointer, 1614 1615 /// CK_PointerToIntegral - Pointer to integral 1616 CK_PointerToIntegral, 1617 1618 /// CK_ToVoid - Cast to void. 1619 CK_ToVoid, 1620 1621 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1622 /// vector type with the same element type as the src type. Splats the 1623 /// src expression into the destination expression. 1624 CK_VectorSplat, 1625 1626 /// CK_IntegralCast - Casting between integral types of different size. 1627 CK_IntegralCast, 1628 1629 /// CK_IntegralToFloating - Integral to floating point. 1630 CK_IntegralToFloating, 1631 1632 /// CK_FloatingToIntegral - Floating point to integral. 1633 CK_FloatingToIntegral, 1634 1635 /// CK_FloatingCast - Casting between floating types of different size. 1636 CK_FloatingCast, 1637 1638 /// CK_MemberPointerToBoolean - Member pointer to boolean 1639 CK_MemberPointerToBoolean, 1640 1641 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1642 /// pointer 1643 CK_AnyPointerToObjCPointerCast, 1644 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1645 /// pointer 1646 CK_AnyPointerToBlockPointerCast 1647 1648 }; 1649 1650private: 1651 CastKind Kind; 1652 Stmt *Op; 1653 1654 /// BasePath - For derived-to-base and base-to-derived casts, the base array 1655 /// contains the inheritance path. 1656 CXXBaseSpecifierArray BasePath; 1657 1658 void CheckBasePath() const { 1659#ifndef NDEBUG 1660 switch (getCastKind()) { 1661 case CK_DerivedToBase: 1662 assert(!BasePath.empty() && "Cast kind should have a base path!"); 1663 break; 1664 1665 // FIXME: We should add inheritance paths for these. 1666 case CK_BaseToDerived: 1667 case CK_UncheckedDerivedToBase: 1668 case CK_BaseToDerivedMemberPointer: 1669 case CK_DerivedToBaseMemberPointer: 1670 1671 // These should not have an inheritance path. 1672 case CK_Unknown: 1673 case CK_BitCast: 1674 case CK_NoOp: 1675 case CK_Dynamic: 1676 case CK_ToUnion: 1677 case CK_ArrayToPointerDecay: 1678 case CK_FunctionToPointerDecay: 1679 case CK_NullToMemberPointer: 1680 case CK_UserDefinedConversion: 1681 case CK_ConstructorConversion: 1682 case CK_IntegralToPointer: 1683 case CK_PointerToIntegral: 1684 case CK_ToVoid: 1685 case CK_VectorSplat: 1686 case CK_IntegralCast: 1687 case CK_IntegralToFloating: 1688 case CK_FloatingToIntegral: 1689 case CK_FloatingCast: 1690 case CK_MemberPointerToBoolean: 1691 case CK_AnyPointerToObjCPointerCast: 1692 case CK_AnyPointerToBlockPointerCast: 1693 assert(BasePath.empty() && "Cast kind should not have a base path!"); 1694 break; 1695 } 1696#endif 1697 } 1698 1699protected: 1700 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1701 CXXBaseSpecifierArray BasePath) : 1702 Expr(SC, ty, 1703 // Cast expressions are type-dependent if the type is 1704 // dependent (C++ [temp.dep.expr]p3). 1705 ty->isDependentType(), 1706 // Cast expressions are value-dependent if the type is 1707 // dependent or if the subexpression is value-dependent. 1708 ty->isDependentType() || (op && op->isValueDependent())), 1709 Kind(kind), Op(op), BasePath(BasePath) { 1710 CheckBasePath(); 1711 } 1712 1713 /// \brief Construct an empty cast. 1714 CastExpr(StmtClass SC, EmptyShell Empty) 1715 : Expr(SC, Empty) { } 1716 1717 virtual void DoDestroy(ASTContext &C); 1718 1719public: 1720 CastKind getCastKind() const { return Kind; } 1721 void setCastKind(CastKind K) { Kind = K; } 1722 const char *getCastKindName() const; 1723 1724 Expr *getSubExpr() { return cast<Expr>(Op); } 1725 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1726 void setSubExpr(Expr *E) { Op = E; } 1727 1728 /// \brief Retrieve the cast subexpression as it was written in the source 1729 /// code, looking through any implicit casts or other intermediate nodes 1730 /// introduced by semantic analysis. 1731 Expr *getSubExprAsWritten(); 1732 const Expr *getSubExprAsWritten() const { 1733 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 1734 } 1735 1736 const CXXBaseSpecifierArray& getBasePath() { return BasePath; } 1737 1738 static bool classof(const Stmt *T) { 1739 StmtClass SC = T->getStmtClass(); 1740 if (SC >= CXXStaticCastExprClass && SC <= CXXFunctionalCastExprClass) 1741 return true; 1742 1743 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1744 return true; 1745 1746 return false; 1747 } 1748 static bool classof(const CastExpr *) { return true; } 1749 1750 // Iterators 1751 virtual child_iterator child_begin(); 1752 virtual child_iterator child_end(); 1753}; 1754 1755/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1756/// conversions, which have no direct representation in the original 1757/// source code. For example: converting T[]->T*, void f()->void 1758/// (*f)(), float->double, short->int, etc. 1759/// 1760/// In C, implicit casts always produce rvalues. However, in C++, an 1761/// implicit cast whose result is being bound to a reference will be 1762/// an lvalue. For example: 1763/// 1764/// @code 1765/// class Base { }; 1766/// class Derived : public Base { }; 1767/// void f(Derived d) { 1768/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1769/// } 1770/// @endcode 1771class ImplicitCastExpr : public CastExpr { 1772 /// LvalueCast - Whether this cast produces an lvalue. 1773 bool LvalueCast; 1774 1775public: 1776 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 1777 CXXBaseSpecifierArray BasePath, bool Lvalue) 1778 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePath), 1779 LvalueCast(Lvalue) { } 1780 1781 /// \brief Construct an empty implicit cast. 1782 explicit ImplicitCastExpr(EmptyShell Shell) 1783 : CastExpr(ImplicitCastExprClass, Shell) { } 1784 1785 virtual SourceRange getSourceRange() const { 1786 return getSubExpr()->getSourceRange(); 1787 } 1788 1789 /// isLvalueCast - Whether this cast produces an lvalue. 1790 bool isLvalueCast() const { return LvalueCast; } 1791 1792 /// setLvalueCast - Set whether this cast produces an lvalue. 1793 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1794 1795 static bool classof(const Stmt *T) { 1796 return T->getStmtClass() == ImplicitCastExprClass; 1797 } 1798 static bool classof(const ImplicitCastExpr *) { return true; } 1799}; 1800 1801/// ExplicitCastExpr - An explicit cast written in the source 1802/// code. 1803/// 1804/// This class is effectively an abstract class, because it provides 1805/// the basic representation of an explicitly-written cast without 1806/// specifying which kind of cast (C cast, functional cast, static 1807/// cast, etc.) was written; specific derived classes represent the 1808/// particular style of cast and its location information. 1809/// 1810/// Unlike implicit casts, explicit cast nodes have two different 1811/// types: the type that was written into the source code, and the 1812/// actual type of the expression as determined by semantic 1813/// analysis. These types may differ slightly. For example, in C++ one 1814/// can cast to a reference type, which indicates that the resulting 1815/// expression will be an lvalue. The reference type, however, will 1816/// not be used as the type of the expression. 1817class ExplicitCastExpr : public CastExpr { 1818 /// TInfo - Source type info for the (written) type 1819 /// this expression is casting to. 1820 TypeSourceInfo *TInfo; 1821 1822protected: 1823 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1824 Expr *op, CXXBaseSpecifierArray BasePath, 1825 TypeSourceInfo *writtenTy) 1826 : CastExpr(SC, exprTy, kind, op, BasePath), TInfo(writtenTy) {} 1827 1828 /// \brief Construct an empty explicit cast. 1829 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1830 : CastExpr(SC, Shell) { } 1831 1832public: 1833 /// getTypeInfoAsWritten - Returns the type source info for the type 1834 /// that this expression is casting to. 1835 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 1836 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 1837 1838 /// getTypeAsWritten - Returns the type that this expression is 1839 /// casting to, as written in the source code. 1840 QualType getTypeAsWritten() const { return TInfo->getType(); } 1841 1842 static bool classof(const Stmt *T) { 1843 StmtClass SC = T->getStmtClass(); 1844 if (SC >= CStyleCastExprClass && SC <= CStyleCastExprClass) 1845 return true; 1846 if (SC >= CXXStaticCastExprClass && SC <= CXXFunctionalCastExprClass) 1847 return true; 1848 1849 return false; 1850 } 1851 static bool classof(const ExplicitCastExpr *) { return true; } 1852}; 1853 1854/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1855/// cast in C++ (C++ [expr.cast]), which uses the syntax 1856/// (Type)expr. For example: @c (int)f. 1857class CStyleCastExpr : public ExplicitCastExpr { 1858 SourceLocation LPLoc; // the location of the left paren 1859 SourceLocation RPLoc; // the location of the right paren 1860public: 1861 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 1862 CXXBaseSpecifierArray BasePath, TypeSourceInfo *writtenTy, 1863 SourceLocation l, SourceLocation r) 1864 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, BasePath, 1865 writtenTy), LPLoc(l), RPLoc(r) {} 1866 1867 /// \brief Construct an empty C-style explicit cast. 1868 explicit CStyleCastExpr(EmptyShell Shell) 1869 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1870 1871 SourceLocation getLParenLoc() const { return LPLoc; } 1872 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1873 1874 SourceLocation getRParenLoc() const { return RPLoc; } 1875 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1876 1877 virtual SourceRange getSourceRange() const { 1878 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1879 } 1880 static bool classof(const Stmt *T) { 1881 return T->getStmtClass() == CStyleCastExprClass; 1882 } 1883 static bool classof(const CStyleCastExpr *) { return true; } 1884}; 1885 1886/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1887/// 1888/// This expression node kind describes a builtin binary operation, 1889/// such as "x + y" for integer values "x" and "y". The operands will 1890/// already have been converted to appropriate types (e.g., by 1891/// performing promotions or conversions). 1892/// 1893/// In C++, where operators may be overloaded, a different kind of 1894/// expression node (CXXOperatorCallExpr) is used to express the 1895/// invocation of an overloaded operator with operator syntax. Within 1896/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1897/// used to store an expression "x + y" depends on the subexpressions 1898/// for x and y. If neither x or y is type-dependent, and the "+" 1899/// operator resolves to a built-in operation, BinaryOperator will be 1900/// used to express the computation (x and y may still be 1901/// value-dependent). If either x or y is type-dependent, or if the 1902/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1903/// be used to express the computation. 1904class BinaryOperator : public Expr { 1905public: 1906 enum Opcode { 1907 // Operators listed in order of precedence. 1908 // Note that additions to this should also update the StmtVisitor class. 1909 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1910 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1911 Add, Sub, // [C99 6.5.6] Additive operators. 1912 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1913 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1914 EQ, NE, // [C99 6.5.9] Equality operators. 1915 And, // [C99 6.5.10] Bitwise AND operator. 1916 Xor, // [C99 6.5.11] Bitwise XOR operator. 1917 Or, // [C99 6.5.12] Bitwise OR operator. 1918 LAnd, // [C99 6.5.13] Logical AND operator. 1919 LOr, // [C99 6.5.14] Logical OR operator. 1920 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1921 DivAssign, RemAssign, 1922 AddAssign, SubAssign, 1923 ShlAssign, ShrAssign, 1924 AndAssign, XorAssign, 1925 OrAssign, 1926 Comma // [C99 6.5.17] Comma operator. 1927 }; 1928private: 1929 enum { LHS, RHS, END_EXPR }; 1930 Stmt* SubExprs[END_EXPR]; 1931 Opcode Opc; 1932 SourceLocation OpLoc; 1933public: 1934 1935 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1936 SourceLocation opLoc) 1937 : Expr(BinaryOperatorClass, ResTy, 1938 lhs->isTypeDependent() || rhs->isTypeDependent(), 1939 lhs->isValueDependent() || rhs->isValueDependent()), 1940 Opc(opc), OpLoc(opLoc) { 1941 SubExprs[LHS] = lhs; 1942 SubExprs[RHS] = rhs; 1943 assert(!isCompoundAssignmentOp() && 1944 "Use ArithAssignBinaryOperator for compound assignments"); 1945 } 1946 1947 /// \brief Construct an empty binary operator. 1948 explicit BinaryOperator(EmptyShell Empty) 1949 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1950 1951 SourceLocation getOperatorLoc() const { return OpLoc; } 1952 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1953 1954 Opcode getOpcode() const { return Opc; } 1955 void setOpcode(Opcode O) { Opc = O; } 1956 1957 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1958 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1959 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1960 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1961 1962 virtual SourceRange getSourceRange() const { 1963 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1964 } 1965 1966 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1967 /// corresponds to, e.g. "<<=". 1968 static const char *getOpcodeStr(Opcode Op); 1969 1970 /// \brief Retrieve the binary opcode that corresponds to the given 1971 /// overloaded operator. 1972 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1973 1974 /// \brief Retrieve the overloaded operator kind that corresponds to 1975 /// the given binary opcode. 1976 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1977 1978 /// predicates to categorize the respective opcodes. 1979 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1980 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1981 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1982 bool isShiftOp() const { return isShiftOp(Opc); } 1983 1984 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1985 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1986 1987 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1988 bool isRelationalOp() const { return isRelationalOp(Opc); } 1989 1990 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1991 bool isEqualityOp() const { return isEqualityOp(Opc); } 1992 1993 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1994 bool isComparisonOp() const { return isComparisonOp(Opc); } 1995 1996 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1997 bool isLogicalOp() const { return isLogicalOp(Opc); } 1998 1999 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 2000 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 2001 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 2002 2003 static bool classof(const Stmt *S) { 2004 return S->getStmtClass() == BinaryOperatorClass || 2005 S->getStmtClass() == CompoundAssignOperatorClass; 2006 } 2007 static bool classof(const BinaryOperator *) { return true; } 2008 2009 // Iterators 2010 virtual child_iterator child_begin(); 2011 virtual child_iterator child_end(); 2012 2013protected: 2014 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2015 SourceLocation opLoc, bool dead) 2016 : Expr(CompoundAssignOperatorClass, ResTy, 2017 lhs->isTypeDependent() || rhs->isTypeDependent(), 2018 lhs->isValueDependent() || rhs->isValueDependent()), 2019 Opc(opc), OpLoc(opLoc) { 2020 SubExprs[LHS] = lhs; 2021 SubExprs[RHS] = rhs; 2022 } 2023 2024 BinaryOperator(StmtClass SC, EmptyShell Empty) 2025 : Expr(SC, Empty), Opc(MulAssign) { } 2026}; 2027 2028/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2029/// track of the type the operation is performed in. Due to the semantics of 2030/// these operators, the operands are promoted, the aritmetic performed, an 2031/// implicit conversion back to the result type done, then the assignment takes 2032/// place. This captures the intermediate type which the computation is done 2033/// in. 2034class CompoundAssignOperator : public BinaryOperator { 2035 QualType ComputationLHSType; 2036 QualType ComputationResultType; 2037public: 2038 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2039 QualType ResType, QualType CompLHSType, 2040 QualType CompResultType, 2041 SourceLocation OpLoc) 2042 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2043 ComputationLHSType(CompLHSType), 2044 ComputationResultType(CompResultType) { 2045 assert(isCompoundAssignmentOp() && 2046 "Only should be used for compound assignments"); 2047 } 2048 2049 /// \brief Build an empty compound assignment operator expression. 2050 explicit CompoundAssignOperator(EmptyShell Empty) 2051 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2052 2053 // The two computation types are the type the LHS is converted 2054 // to for the computation and the type of the result; the two are 2055 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2056 QualType getComputationLHSType() const { return ComputationLHSType; } 2057 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2058 2059 QualType getComputationResultType() const { return ComputationResultType; } 2060 void setComputationResultType(QualType T) { ComputationResultType = T; } 2061 2062 static bool classof(const CompoundAssignOperator *) { return true; } 2063 static bool classof(const Stmt *S) { 2064 return S->getStmtClass() == CompoundAssignOperatorClass; 2065 } 2066}; 2067 2068/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2069/// GNU "missing LHS" extension is in use. 2070/// 2071class ConditionalOperator : public Expr { 2072 enum { COND, LHS, RHS, END_EXPR }; 2073 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2074 SourceLocation QuestionLoc, ColonLoc; 2075public: 2076 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2077 SourceLocation CLoc, Expr *rhs, QualType t) 2078 : Expr(ConditionalOperatorClass, t, 2079 // FIXME: the type of the conditional operator doesn't 2080 // depend on the type of the conditional, but the standard 2081 // seems to imply that it could. File a bug! 2082 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2083 (cond->isValueDependent() || 2084 (lhs && lhs->isValueDependent()) || 2085 (rhs && rhs->isValueDependent()))), 2086 QuestionLoc(QLoc), 2087 ColonLoc(CLoc) { 2088 SubExprs[COND] = cond; 2089 SubExprs[LHS] = lhs; 2090 SubExprs[RHS] = rhs; 2091 } 2092 2093 /// \brief Build an empty conditional operator. 2094 explicit ConditionalOperator(EmptyShell Empty) 2095 : Expr(ConditionalOperatorClass, Empty) { } 2096 2097 // getCond - Return the expression representing the condition for 2098 // the ?: operator. 2099 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2100 void setCond(Expr *E) { SubExprs[COND] = E; } 2101 2102 // getTrueExpr - Return the subexpression representing the value of the ?: 2103 // expression if the condition evaluates to true. In most cases this value 2104 // will be the same as getLHS() except a GCC extension allows the left 2105 // subexpression to be omitted, and instead of the condition be returned. 2106 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2107 // is only evaluated once. 2108 Expr *getTrueExpr() const { 2109 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2110 } 2111 2112 // getTrueExpr - Return the subexpression representing the value of the ?: 2113 // expression if the condition evaluates to false. This is the same as getRHS. 2114 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2115 2116 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2117 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2118 2119 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2120 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2121 2122 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2123 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2124 2125 SourceLocation getColonLoc() const { return ColonLoc; } 2126 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2127 2128 virtual SourceRange getSourceRange() const { 2129 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2130 } 2131 static bool classof(const Stmt *T) { 2132 return T->getStmtClass() == ConditionalOperatorClass; 2133 } 2134 static bool classof(const ConditionalOperator *) { return true; } 2135 2136 // Iterators 2137 virtual child_iterator child_begin(); 2138 virtual child_iterator child_end(); 2139}; 2140 2141/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2142class AddrLabelExpr : public Expr { 2143 SourceLocation AmpAmpLoc, LabelLoc; 2144 LabelStmt *Label; 2145public: 2146 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2147 QualType t) 2148 : Expr(AddrLabelExprClass, t, false, false), 2149 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2150 2151 /// \brief Build an empty address of a label expression. 2152 explicit AddrLabelExpr(EmptyShell Empty) 2153 : Expr(AddrLabelExprClass, Empty) { } 2154 2155 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2156 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2157 SourceLocation getLabelLoc() const { return LabelLoc; } 2158 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2159 2160 virtual SourceRange getSourceRange() const { 2161 return SourceRange(AmpAmpLoc, LabelLoc); 2162 } 2163 2164 LabelStmt *getLabel() const { return Label; } 2165 void setLabel(LabelStmt *S) { Label = S; } 2166 2167 static bool classof(const Stmt *T) { 2168 return T->getStmtClass() == AddrLabelExprClass; 2169 } 2170 static bool classof(const AddrLabelExpr *) { return true; } 2171 2172 // Iterators 2173 virtual child_iterator child_begin(); 2174 virtual child_iterator child_end(); 2175}; 2176 2177/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2178/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2179/// takes the value of the last subexpression. 2180class StmtExpr : public Expr { 2181 Stmt *SubStmt; 2182 SourceLocation LParenLoc, RParenLoc; 2183public: 2184 // FIXME: Does type-dependence need to be computed differently? 2185 StmtExpr(CompoundStmt *substmt, QualType T, 2186 SourceLocation lp, SourceLocation rp) : 2187 Expr(StmtExprClass, T, T->isDependentType(), false), 2188 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2189 2190 /// \brief Build an empty statement expression. 2191 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2192 2193 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2194 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2195 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2196 2197 virtual SourceRange getSourceRange() const { 2198 return SourceRange(LParenLoc, RParenLoc); 2199 } 2200 2201 SourceLocation getLParenLoc() const { return LParenLoc; } 2202 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2203 SourceLocation getRParenLoc() const { return RParenLoc; } 2204 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2205 2206 static bool classof(const Stmt *T) { 2207 return T->getStmtClass() == StmtExprClass; 2208 } 2209 static bool classof(const StmtExpr *) { return true; } 2210 2211 // Iterators 2212 virtual child_iterator child_begin(); 2213 virtual child_iterator child_end(); 2214}; 2215 2216/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2217/// This AST node represents a function that returns 1 if two *types* (not 2218/// expressions) are compatible. The result of this built-in function can be 2219/// used in integer constant expressions. 2220class TypesCompatibleExpr : public Expr { 2221 QualType Type1; 2222 QualType Type2; 2223 SourceLocation BuiltinLoc, RParenLoc; 2224public: 2225 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2226 QualType t1, QualType t2, SourceLocation RP) : 2227 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2228 Type1(t1), Type2(t2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2229 2230 /// \brief Build an empty __builtin_type_compatible_p expression. 2231 explicit TypesCompatibleExpr(EmptyShell Empty) 2232 : Expr(TypesCompatibleExprClass, Empty) { } 2233 2234 QualType getArgType1() const { return Type1; } 2235 void setArgType1(QualType T) { Type1 = T; } 2236 QualType getArgType2() const { return Type2; } 2237 void setArgType2(QualType T) { Type2 = T; } 2238 2239 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2240 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2241 2242 SourceLocation getRParenLoc() const { return RParenLoc; } 2243 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2244 2245 virtual SourceRange getSourceRange() const { 2246 return SourceRange(BuiltinLoc, RParenLoc); 2247 } 2248 static bool classof(const Stmt *T) { 2249 return T->getStmtClass() == TypesCompatibleExprClass; 2250 } 2251 static bool classof(const TypesCompatibleExpr *) { return true; } 2252 2253 // Iterators 2254 virtual child_iterator child_begin(); 2255 virtual child_iterator child_end(); 2256}; 2257 2258/// ShuffleVectorExpr - clang-specific builtin-in function 2259/// __builtin_shufflevector. 2260/// This AST node represents a operator that does a constant 2261/// shuffle, similar to LLVM's shufflevector instruction. It takes 2262/// two vectors and a variable number of constant indices, 2263/// and returns the appropriately shuffled vector. 2264class ShuffleVectorExpr : public Expr { 2265 SourceLocation BuiltinLoc, RParenLoc; 2266 2267 // SubExprs - the list of values passed to the __builtin_shufflevector 2268 // function. The first two are vectors, and the rest are constant 2269 // indices. The number of values in this list is always 2270 // 2+the number of indices in the vector type. 2271 Stmt **SubExprs; 2272 unsigned NumExprs; 2273 2274protected: 2275 virtual void DoDestroy(ASTContext &C); 2276 2277public: 2278 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2279 // to be computed differently? 2280 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2281 QualType Type, SourceLocation BLoc, 2282 SourceLocation RP) : 2283 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2284 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2285 2286 SubExprs = new (C) Stmt*[nexpr]; 2287 for (unsigned i = 0; i < nexpr; i++) 2288 SubExprs[i] = args[i]; 2289 } 2290 2291 /// \brief Build an empty vector-shuffle expression. 2292 explicit ShuffleVectorExpr(EmptyShell Empty) 2293 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2294 2295 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2296 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2297 2298 SourceLocation getRParenLoc() const { return RParenLoc; } 2299 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2300 2301 virtual SourceRange getSourceRange() const { 2302 return SourceRange(BuiltinLoc, RParenLoc); 2303 } 2304 static bool classof(const Stmt *T) { 2305 return T->getStmtClass() == ShuffleVectorExprClass; 2306 } 2307 static bool classof(const ShuffleVectorExpr *) { return true; } 2308 2309 ~ShuffleVectorExpr() {} 2310 2311 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2312 /// constant expression, the actual arguments passed in, and the function 2313 /// pointers. 2314 unsigned getNumSubExprs() const { return NumExprs; } 2315 2316 /// getExpr - Return the Expr at the specified index. 2317 Expr *getExpr(unsigned Index) { 2318 assert((Index < NumExprs) && "Arg access out of range!"); 2319 return cast<Expr>(SubExprs[Index]); 2320 } 2321 const Expr *getExpr(unsigned Index) const { 2322 assert((Index < NumExprs) && "Arg access out of range!"); 2323 return cast<Expr>(SubExprs[Index]); 2324 } 2325 2326 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2327 2328 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2329 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2330 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2331 } 2332 2333 // Iterators 2334 virtual child_iterator child_begin(); 2335 virtual child_iterator child_end(); 2336}; 2337 2338/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2339/// This AST node is similar to the conditional operator (?:) in C, with 2340/// the following exceptions: 2341/// - the test expression must be a integer constant expression. 2342/// - the expression returned acts like the chosen subexpression in every 2343/// visible way: the type is the same as that of the chosen subexpression, 2344/// and all predicates (whether it's an l-value, whether it's an integer 2345/// constant expression, etc.) return the same result as for the chosen 2346/// sub-expression. 2347class ChooseExpr : public Expr { 2348 enum { COND, LHS, RHS, END_EXPR }; 2349 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2350 SourceLocation BuiltinLoc, RParenLoc; 2351public: 2352 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2353 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2354 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2355 BuiltinLoc(BLoc), RParenLoc(RP) { 2356 SubExprs[COND] = cond; 2357 SubExprs[LHS] = lhs; 2358 SubExprs[RHS] = rhs; 2359 } 2360 2361 /// \brief Build an empty __builtin_choose_expr. 2362 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2363 2364 /// isConditionTrue - Return whether the condition is true (i.e. not 2365 /// equal to zero). 2366 bool isConditionTrue(ASTContext &C) const; 2367 2368 /// getChosenSubExpr - Return the subexpression chosen according to the 2369 /// condition. 2370 Expr *getChosenSubExpr(ASTContext &C) const { 2371 return isConditionTrue(C) ? getLHS() : getRHS(); 2372 } 2373 2374 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2375 void setCond(Expr *E) { SubExprs[COND] = E; } 2376 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2377 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2378 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2379 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2380 2381 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2382 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2383 2384 SourceLocation getRParenLoc() const { return RParenLoc; } 2385 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2386 2387 virtual SourceRange getSourceRange() const { 2388 return SourceRange(BuiltinLoc, RParenLoc); 2389 } 2390 static bool classof(const Stmt *T) { 2391 return T->getStmtClass() == ChooseExprClass; 2392 } 2393 static bool classof(const ChooseExpr *) { return true; } 2394 2395 // Iterators 2396 virtual child_iterator child_begin(); 2397 virtual child_iterator child_end(); 2398}; 2399 2400/// GNUNullExpr - Implements the GNU __null extension, which is a name 2401/// for a null pointer constant that has integral type (e.g., int or 2402/// long) and is the same size and alignment as a pointer. The __null 2403/// extension is typically only used by system headers, which define 2404/// NULL as __null in C++ rather than using 0 (which is an integer 2405/// that may not match the size of a pointer). 2406class GNUNullExpr : public Expr { 2407 /// TokenLoc - The location of the __null keyword. 2408 SourceLocation TokenLoc; 2409 2410public: 2411 GNUNullExpr(QualType Ty, SourceLocation Loc) 2412 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2413 2414 /// \brief Build an empty GNU __null expression. 2415 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2416 2417 /// getTokenLocation - The location of the __null token. 2418 SourceLocation getTokenLocation() const { return TokenLoc; } 2419 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2420 2421 virtual SourceRange getSourceRange() const { 2422 return SourceRange(TokenLoc); 2423 } 2424 static bool classof(const Stmt *T) { 2425 return T->getStmtClass() == GNUNullExprClass; 2426 } 2427 static bool classof(const GNUNullExpr *) { return true; } 2428 2429 // Iterators 2430 virtual child_iterator child_begin(); 2431 virtual child_iterator child_end(); 2432}; 2433 2434/// VAArgExpr, used for the builtin function __builtin_va_arg. 2435class VAArgExpr : public Expr { 2436 Stmt *Val; 2437 SourceLocation BuiltinLoc, RParenLoc; 2438public: 2439 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2440 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2441 Val(e), 2442 BuiltinLoc(BLoc), 2443 RParenLoc(RPLoc) { } 2444 2445 /// \brief Create an empty __builtin_va_arg expression. 2446 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2447 2448 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2449 Expr *getSubExpr() { return cast<Expr>(Val); } 2450 void setSubExpr(Expr *E) { Val = E; } 2451 2452 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2453 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2454 2455 SourceLocation getRParenLoc() const { return RParenLoc; } 2456 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2457 2458 virtual SourceRange getSourceRange() const { 2459 return SourceRange(BuiltinLoc, RParenLoc); 2460 } 2461 static bool classof(const Stmt *T) { 2462 return T->getStmtClass() == VAArgExprClass; 2463 } 2464 static bool classof(const VAArgExpr *) { return true; } 2465 2466 // Iterators 2467 virtual child_iterator child_begin(); 2468 virtual child_iterator child_end(); 2469}; 2470 2471/// @brief Describes an C or C++ initializer list. 2472/// 2473/// InitListExpr describes an initializer list, which can be used to 2474/// initialize objects of different types, including 2475/// struct/class/union types, arrays, and vectors. For example: 2476/// 2477/// @code 2478/// struct foo x = { 1, { 2, 3 } }; 2479/// @endcode 2480/// 2481/// Prior to semantic analysis, an initializer list will represent the 2482/// initializer list as written by the user, but will have the 2483/// placeholder type "void". This initializer list is called the 2484/// syntactic form of the initializer, and may contain C99 designated 2485/// initializers (represented as DesignatedInitExprs), initializations 2486/// of subobject members without explicit braces, and so on. Clients 2487/// interested in the original syntax of the initializer list should 2488/// use the syntactic form of the initializer list. 2489/// 2490/// After semantic analysis, the initializer list will represent the 2491/// semantic form of the initializer, where the initializations of all 2492/// subobjects are made explicit with nested InitListExpr nodes and 2493/// C99 designators have been eliminated by placing the designated 2494/// initializations into the subobject they initialize. Additionally, 2495/// any "holes" in the initialization, where no initializer has been 2496/// specified for a particular subobject, will be replaced with 2497/// implicitly-generated ImplicitValueInitExpr expressions that 2498/// value-initialize the subobjects. Note, however, that the 2499/// initializer lists may still have fewer initializers than there are 2500/// elements to initialize within the object. 2501/// 2502/// Given the semantic form of the initializer list, one can retrieve 2503/// the original syntactic form of that initializer list (if it 2504/// exists) using getSyntacticForm(). Since many initializer lists 2505/// have the same syntactic and semantic forms, getSyntacticForm() may 2506/// return NULL, indicating that the current initializer list also 2507/// serves as its syntactic form. 2508class InitListExpr : public Expr { 2509 // FIXME: Eliminate this vector in favor of ASTContext allocation 2510 typedef ASTVector<Stmt *> InitExprsTy; 2511 InitExprsTy InitExprs; 2512 SourceLocation LBraceLoc, RBraceLoc; 2513 2514 /// Contains the initializer list that describes the syntactic form 2515 /// written in the source code. 2516 InitListExpr *SyntacticForm; 2517 2518 /// If this initializer list initializes a union, specifies which 2519 /// field within the union will be initialized. 2520 FieldDecl *UnionFieldInit; 2521 2522 /// Whether this initializer list originally had a GNU array-range 2523 /// designator in it. This is a temporary marker used by CodeGen. 2524 bool HadArrayRangeDesignator; 2525 2526public: 2527 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2528 Expr **initexprs, unsigned numinits, 2529 SourceLocation rbraceloc); 2530 2531 /// \brief Build an empty initializer list. 2532 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2533 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2534 2535 unsigned getNumInits() const { return InitExprs.size(); } 2536 2537 const Expr* getInit(unsigned Init) const { 2538 assert(Init < getNumInits() && "Initializer access out of range!"); 2539 return cast_or_null<Expr>(InitExprs[Init]); 2540 } 2541 2542 Expr* getInit(unsigned Init) { 2543 assert(Init < getNumInits() && "Initializer access out of range!"); 2544 return cast_or_null<Expr>(InitExprs[Init]); 2545 } 2546 2547 void setInit(unsigned Init, Expr *expr) { 2548 assert(Init < getNumInits() && "Initializer access out of range!"); 2549 InitExprs[Init] = expr; 2550 } 2551 2552 /// \brief Reserve space for some number of initializers. 2553 void reserveInits(ASTContext &C, unsigned NumInits); 2554 2555 /// @brief Specify the number of initializers 2556 /// 2557 /// If there are more than @p NumInits initializers, the remaining 2558 /// initializers will be destroyed. If there are fewer than @p 2559 /// NumInits initializers, NULL expressions will be added for the 2560 /// unknown initializers. 2561 void resizeInits(ASTContext &Context, unsigned NumInits); 2562 2563 /// @brief Updates the initializer at index @p Init with the new 2564 /// expression @p expr, and returns the old expression at that 2565 /// location. 2566 /// 2567 /// When @p Init is out of range for this initializer list, the 2568 /// initializer list will be extended with NULL expressions to 2569 /// accomodate the new entry. 2570 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2571 2572 /// \brief If this initializes a union, specifies which field in the 2573 /// union to initialize. 2574 /// 2575 /// Typically, this field is the first named field within the 2576 /// union. However, a designated initializer can specify the 2577 /// initialization of a different field within the union. 2578 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2579 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2580 2581 // Explicit InitListExpr's originate from source code (and have valid source 2582 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2583 bool isExplicit() { 2584 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2585 } 2586 2587 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2588 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2589 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2590 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2591 2592 /// @brief Retrieve the initializer list that describes the 2593 /// syntactic form of the initializer. 2594 /// 2595 /// 2596 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2597 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2598 2599 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2600 void sawArrayRangeDesignator(bool ARD = true) { 2601 HadArrayRangeDesignator = ARD; 2602 } 2603 2604 virtual SourceRange getSourceRange() const { 2605 return SourceRange(LBraceLoc, RBraceLoc); 2606 } 2607 static bool classof(const Stmt *T) { 2608 return T->getStmtClass() == InitListExprClass; 2609 } 2610 static bool classof(const InitListExpr *) { return true; } 2611 2612 // Iterators 2613 virtual child_iterator child_begin(); 2614 virtual child_iterator child_end(); 2615 2616 typedef InitExprsTy::iterator iterator; 2617 typedef InitExprsTy::reverse_iterator reverse_iterator; 2618 2619 iterator begin() { return InitExprs.begin(); } 2620 iterator end() { return InitExprs.end(); } 2621 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2622 reverse_iterator rend() { return InitExprs.rend(); } 2623}; 2624 2625/// @brief Represents a C99 designated initializer expression. 2626/// 2627/// A designated initializer expression (C99 6.7.8) contains one or 2628/// more designators (which can be field designators, array 2629/// designators, or GNU array-range designators) followed by an 2630/// expression that initializes the field or element(s) that the 2631/// designators refer to. For example, given: 2632/// 2633/// @code 2634/// struct point { 2635/// double x; 2636/// double y; 2637/// }; 2638/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2639/// @endcode 2640/// 2641/// The InitListExpr contains three DesignatedInitExprs, the first of 2642/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2643/// designators, one array designator for @c [2] followed by one field 2644/// designator for @c .y. The initalization expression will be 1.0. 2645class DesignatedInitExpr : public Expr { 2646public: 2647 /// \brief Forward declaration of the Designator class. 2648 class Designator; 2649 2650private: 2651 /// The location of the '=' or ':' prior to the actual initializer 2652 /// expression. 2653 SourceLocation EqualOrColonLoc; 2654 2655 /// Whether this designated initializer used the GNU deprecated 2656 /// syntax rather than the C99 '=' syntax. 2657 bool GNUSyntax : 1; 2658 2659 /// The number of designators in this initializer expression. 2660 unsigned NumDesignators : 15; 2661 2662 /// \brief The designators in this designated initialization 2663 /// expression. 2664 Designator *Designators; 2665 2666 /// The number of subexpressions of this initializer expression, 2667 /// which contains both the initializer and any additional 2668 /// expressions used by array and array-range designators. 2669 unsigned NumSubExprs : 16; 2670 2671 2672 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2673 const Designator *Designators, 2674 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2675 Expr **IndexExprs, unsigned NumIndexExprs, 2676 Expr *Init); 2677 2678 explicit DesignatedInitExpr(unsigned NumSubExprs) 2679 : Expr(DesignatedInitExprClass, EmptyShell()), 2680 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2681 2682protected: 2683 virtual void DoDestroy(ASTContext &C); 2684 2685 void DestroyDesignators(ASTContext &C); 2686 2687public: 2688 /// A field designator, e.g., ".x". 2689 struct FieldDesignator { 2690 /// Refers to the field that is being initialized. The low bit 2691 /// of this field determines whether this is actually a pointer 2692 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2693 /// initially constructed, a field designator will store an 2694 /// IdentifierInfo*. After semantic analysis has resolved that 2695 /// name, the field designator will instead store a FieldDecl*. 2696 uintptr_t NameOrField; 2697 2698 /// The location of the '.' in the designated initializer. 2699 unsigned DotLoc; 2700 2701 /// The location of the field name in the designated initializer. 2702 unsigned FieldLoc; 2703 }; 2704 2705 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2706 struct ArrayOrRangeDesignator { 2707 /// Location of the first index expression within the designated 2708 /// initializer expression's list of subexpressions. 2709 unsigned Index; 2710 /// The location of the '[' starting the array range designator. 2711 unsigned LBracketLoc; 2712 /// The location of the ellipsis separating the start and end 2713 /// indices. Only valid for GNU array-range designators. 2714 unsigned EllipsisLoc; 2715 /// The location of the ']' terminating the array range designator. 2716 unsigned RBracketLoc; 2717 }; 2718 2719 /// @brief Represents a single C99 designator. 2720 /// 2721 /// @todo This class is infuriatingly similar to clang::Designator, 2722 /// but minor differences (storing indices vs. storing pointers) 2723 /// keep us from reusing it. Try harder, later, to rectify these 2724 /// differences. 2725 class Designator { 2726 /// @brief The kind of designator this describes. 2727 enum { 2728 FieldDesignator, 2729 ArrayDesignator, 2730 ArrayRangeDesignator 2731 } Kind; 2732 2733 union { 2734 /// A field designator, e.g., ".x". 2735 struct FieldDesignator Field; 2736 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2737 struct ArrayOrRangeDesignator ArrayOrRange; 2738 }; 2739 friend class DesignatedInitExpr; 2740 2741 public: 2742 Designator() {} 2743 2744 /// @brief Initializes a field designator. 2745 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2746 SourceLocation FieldLoc) 2747 : Kind(FieldDesignator) { 2748 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2749 Field.DotLoc = DotLoc.getRawEncoding(); 2750 Field.FieldLoc = FieldLoc.getRawEncoding(); 2751 } 2752 2753 /// @brief Initializes an array designator. 2754 Designator(unsigned Index, SourceLocation LBracketLoc, 2755 SourceLocation RBracketLoc) 2756 : Kind(ArrayDesignator) { 2757 ArrayOrRange.Index = Index; 2758 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2759 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2760 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2761 } 2762 2763 /// @brief Initializes a GNU array-range designator. 2764 Designator(unsigned Index, SourceLocation LBracketLoc, 2765 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2766 : Kind(ArrayRangeDesignator) { 2767 ArrayOrRange.Index = Index; 2768 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2769 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2770 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2771 } 2772 2773 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2774 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2775 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2776 2777 IdentifierInfo * getFieldName(); 2778 2779 FieldDecl *getField() { 2780 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2781 if (Field.NameOrField & 0x01) 2782 return 0; 2783 else 2784 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2785 } 2786 2787 void setField(FieldDecl *FD) { 2788 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2789 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2790 } 2791 2792 SourceLocation getDotLoc() const { 2793 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2794 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2795 } 2796 2797 SourceLocation getFieldLoc() const { 2798 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2799 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2800 } 2801 2802 SourceLocation getLBracketLoc() const { 2803 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2804 "Only valid on an array or array-range designator"); 2805 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2806 } 2807 2808 SourceLocation getRBracketLoc() const { 2809 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2810 "Only valid on an array or array-range designator"); 2811 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2812 } 2813 2814 SourceLocation getEllipsisLoc() const { 2815 assert(Kind == ArrayRangeDesignator && 2816 "Only valid on an array-range designator"); 2817 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2818 } 2819 2820 unsigned getFirstExprIndex() const { 2821 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2822 "Only valid on an array or array-range designator"); 2823 return ArrayOrRange.Index; 2824 } 2825 2826 SourceLocation getStartLocation() const { 2827 if (Kind == FieldDesignator) 2828 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2829 else 2830 return getLBracketLoc(); 2831 } 2832 }; 2833 2834 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2835 unsigned NumDesignators, 2836 Expr **IndexExprs, unsigned NumIndexExprs, 2837 SourceLocation EqualOrColonLoc, 2838 bool GNUSyntax, Expr *Init); 2839 2840 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2841 2842 /// @brief Returns the number of designators in this initializer. 2843 unsigned size() const { return NumDesignators; } 2844 2845 // Iterator access to the designators. 2846 typedef Designator* designators_iterator; 2847 designators_iterator designators_begin() { return Designators; } 2848 designators_iterator designators_end() { 2849 return Designators + NumDesignators; 2850 } 2851 2852 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2853 2854 void setDesignators(ASTContext &C, const Designator *Desigs, 2855 unsigned NumDesigs); 2856 2857 Expr *getArrayIndex(const Designator& D); 2858 Expr *getArrayRangeStart(const Designator& D); 2859 Expr *getArrayRangeEnd(const Designator& D); 2860 2861 /// @brief Retrieve the location of the '=' that precedes the 2862 /// initializer value itself, if present. 2863 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2864 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2865 2866 /// @brief Determines whether this designated initializer used the 2867 /// deprecated GNU syntax for designated initializers. 2868 bool usesGNUSyntax() const { return GNUSyntax; } 2869 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2870 2871 /// @brief Retrieve the initializer value. 2872 Expr *getInit() const { 2873 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2874 } 2875 2876 void setInit(Expr *init) { 2877 *child_begin() = init; 2878 } 2879 2880 /// \brief Retrieve the total number of subexpressions in this 2881 /// designated initializer expression, including the actual 2882 /// initialized value and any expressions that occur within array 2883 /// and array-range designators. 2884 unsigned getNumSubExprs() const { return NumSubExprs; } 2885 2886 Expr *getSubExpr(unsigned Idx) { 2887 assert(Idx < NumSubExprs && "Subscript out of range"); 2888 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2889 Ptr += sizeof(DesignatedInitExpr); 2890 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2891 } 2892 2893 void setSubExpr(unsigned Idx, Expr *E) { 2894 assert(Idx < NumSubExprs && "Subscript out of range"); 2895 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2896 Ptr += sizeof(DesignatedInitExpr); 2897 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2898 } 2899 2900 /// \brief Replaces the designator at index @p Idx with the series 2901 /// of designators in [First, Last). 2902 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 2903 const Designator *Last); 2904 2905 virtual SourceRange getSourceRange() const; 2906 2907 static bool classof(const Stmt *T) { 2908 return T->getStmtClass() == DesignatedInitExprClass; 2909 } 2910 static bool classof(const DesignatedInitExpr *) { return true; } 2911 2912 // Iterators 2913 virtual child_iterator child_begin(); 2914 virtual child_iterator child_end(); 2915}; 2916 2917/// \brief Represents an implicitly-generated value initialization of 2918/// an object of a given type. 2919/// 2920/// Implicit value initializations occur within semantic initializer 2921/// list expressions (InitListExpr) as placeholders for subobject 2922/// initializations not explicitly specified by the user. 2923/// 2924/// \see InitListExpr 2925class ImplicitValueInitExpr : public Expr { 2926public: 2927 explicit ImplicitValueInitExpr(QualType ty) 2928 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 2929 2930 /// \brief Construct an empty implicit value initialization. 2931 explicit ImplicitValueInitExpr(EmptyShell Empty) 2932 : Expr(ImplicitValueInitExprClass, Empty) { } 2933 2934 static bool classof(const Stmt *T) { 2935 return T->getStmtClass() == ImplicitValueInitExprClass; 2936 } 2937 static bool classof(const ImplicitValueInitExpr *) { return true; } 2938 2939 virtual SourceRange getSourceRange() const { 2940 return SourceRange(); 2941 } 2942 2943 // Iterators 2944 virtual child_iterator child_begin(); 2945 virtual child_iterator child_end(); 2946}; 2947 2948 2949class ParenListExpr : public Expr { 2950 Stmt **Exprs; 2951 unsigned NumExprs; 2952 SourceLocation LParenLoc, RParenLoc; 2953 2954protected: 2955 virtual void DoDestroy(ASTContext& C); 2956 2957public: 2958 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2959 unsigned numexprs, SourceLocation rparenloc); 2960 2961 ~ParenListExpr() {} 2962 2963 /// \brief Build an empty paren list. 2964 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2965 2966 unsigned getNumExprs() const { return NumExprs; } 2967 2968 const Expr* getExpr(unsigned Init) const { 2969 assert(Init < getNumExprs() && "Initializer access out of range!"); 2970 return cast_or_null<Expr>(Exprs[Init]); 2971 } 2972 2973 Expr* getExpr(unsigned Init) { 2974 assert(Init < getNumExprs() && "Initializer access out of range!"); 2975 return cast_or_null<Expr>(Exprs[Init]); 2976 } 2977 2978 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2979 2980 SourceLocation getLParenLoc() const { return LParenLoc; } 2981 SourceLocation getRParenLoc() const { return RParenLoc; } 2982 2983 virtual SourceRange getSourceRange() const { 2984 return SourceRange(LParenLoc, RParenLoc); 2985 } 2986 static bool classof(const Stmt *T) { 2987 return T->getStmtClass() == ParenListExprClass; 2988 } 2989 static bool classof(const ParenListExpr *) { return true; } 2990 2991 // Iterators 2992 virtual child_iterator child_begin(); 2993 virtual child_iterator child_end(); 2994}; 2995 2996 2997//===----------------------------------------------------------------------===// 2998// Clang Extensions 2999//===----------------------------------------------------------------------===// 3000 3001 3002/// ExtVectorElementExpr - This represents access to specific elements of a 3003/// vector, and may occur on the left hand side or right hand side. For example 3004/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3005/// 3006/// Note that the base may have either vector or pointer to vector type, just 3007/// like a struct field reference. 3008/// 3009class ExtVectorElementExpr : public Expr { 3010 Stmt *Base; 3011 IdentifierInfo *Accessor; 3012 SourceLocation AccessorLoc; 3013public: 3014 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3015 SourceLocation loc) 3016 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3017 base->isValueDependent()), 3018 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3019 3020 /// \brief Build an empty vector element expression. 3021 explicit ExtVectorElementExpr(EmptyShell Empty) 3022 : Expr(ExtVectorElementExprClass, Empty) { } 3023 3024 const Expr *getBase() const { return cast<Expr>(Base); } 3025 Expr *getBase() { return cast<Expr>(Base); } 3026 void setBase(Expr *E) { Base = E; } 3027 3028 IdentifierInfo &getAccessor() const { return *Accessor; } 3029 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3030 3031 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3032 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3033 3034 /// getNumElements - Get the number of components being selected. 3035 unsigned getNumElements() const; 3036 3037 /// containsDuplicateElements - Return true if any element access is 3038 /// repeated. 3039 bool containsDuplicateElements() const; 3040 3041 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3042 /// aggregate Constant of ConstantInt(s). 3043 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3044 3045 virtual SourceRange getSourceRange() const { 3046 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3047 } 3048 3049 /// isArrow - Return true if the base expression is a pointer to vector, 3050 /// return false if the base expression is a vector. 3051 bool isArrow() const; 3052 3053 static bool classof(const Stmt *T) { 3054 return T->getStmtClass() == ExtVectorElementExprClass; 3055 } 3056 static bool classof(const ExtVectorElementExpr *) { return true; } 3057 3058 // Iterators 3059 virtual child_iterator child_begin(); 3060 virtual child_iterator child_end(); 3061}; 3062 3063 3064/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3065/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3066class BlockExpr : public Expr { 3067protected: 3068 BlockDecl *TheBlock; 3069 bool HasBlockDeclRefExprs; 3070public: 3071 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3072 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3073 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3074 3075 /// \brief Build an empty block expression. 3076 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3077 3078 const BlockDecl *getBlockDecl() const { return TheBlock; } 3079 BlockDecl *getBlockDecl() { return TheBlock; } 3080 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3081 3082 // Convenience functions for probing the underlying BlockDecl. 3083 SourceLocation getCaretLocation() const; 3084 const Stmt *getBody() const; 3085 Stmt *getBody(); 3086 3087 virtual SourceRange getSourceRange() const { 3088 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3089 } 3090 3091 /// getFunctionType - Return the underlying function type for this block. 3092 const FunctionType *getFunctionType() const; 3093 3094 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3095 /// inside of the block that reference values outside the block. 3096 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3097 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3098 3099 static bool classof(const Stmt *T) { 3100 return T->getStmtClass() == BlockExprClass; 3101 } 3102 static bool classof(const BlockExpr *) { return true; } 3103 3104 // Iterators 3105 virtual child_iterator child_begin(); 3106 virtual child_iterator child_end(); 3107}; 3108 3109/// BlockDeclRefExpr - A reference to a declared variable, function, 3110/// enum, etc. 3111class BlockDeclRefExpr : public Expr { 3112 ValueDecl *D; 3113 SourceLocation Loc; 3114 bool IsByRef : 1; 3115 bool ConstQualAdded : 1; 3116public: 3117 // FIXME: Fix type/value dependence! 3118 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3119 bool constAdded = false) 3120 : Expr(BlockDeclRefExprClass, t, false, false), D(d), Loc(l), IsByRef(ByRef), 3121 ConstQualAdded(constAdded) {} 3122 3123 // \brief Build an empty reference to a declared variable in a 3124 // block. 3125 explicit BlockDeclRefExpr(EmptyShell Empty) 3126 : Expr(BlockDeclRefExprClass, Empty) { } 3127 3128 ValueDecl *getDecl() { return D; } 3129 const ValueDecl *getDecl() const { return D; } 3130 void setDecl(ValueDecl *VD) { D = VD; } 3131 3132 SourceLocation getLocation() const { return Loc; } 3133 void setLocation(SourceLocation L) { Loc = L; } 3134 3135 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3136 3137 bool isByRef() const { return IsByRef; } 3138 void setByRef(bool BR) { IsByRef = BR; } 3139 3140 bool isConstQualAdded() const { return ConstQualAdded; } 3141 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3142 3143 static bool classof(const Stmt *T) { 3144 return T->getStmtClass() == BlockDeclRefExprClass; 3145 } 3146 static bool classof(const BlockDeclRefExpr *) { return true; } 3147 3148 // Iterators 3149 virtual child_iterator child_begin(); 3150 virtual child_iterator child_end(); 3151}; 3152 3153} // end namespace clang 3154 3155#endif 3156