Expr.h revision d0937224f383c7cc72c947119380f9713a070c73
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/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/UsuallyTinyPtrVector.h" 24#include "llvm/ADT/APSInt.h" 25#include "llvm/ADT/APFloat.h" 26#include "llvm/ADT/SmallVector.h" 27#include "llvm/ADT/StringRef.h" 28#include <vector> 29 30namespace clang { 31 class ASTContext; 32 class APValue; 33 class Decl; 34 class IdentifierInfo; 35 class ParmVarDecl; 36 class NamedDecl; 37 class ValueDecl; 38 class BlockDecl; 39 class CXXBaseSpecifier; 40 class CXXOperatorCallExpr; 41 class CXXMemberCallExpr; 42 class ObjCPropertyRefExpr; 43 class TemplateArgumentLoc; 44 class TemplateArgumentListInfo; 45 46/// \brief A simple array of base specifiers. 47typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 48 49/// Expr - This represents one expression. Note that Expr's are subclasses of 50/// Stmt. This allows an expression to be transparently used any place a Stmt 51/// is required. 52/// 53class Expr : public Stmt { 54 QualType TR; 55 56 virtual void ANCHOR(); // key function. 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD) : Stmt(SC) { 61 ExprBits.TypeDependent = TD; 62 ExprBits.ValueDependent = VD; 63 ExprBits.ValueKind = VK; 64 ExprBits.ObjectKind = OK; 65 // FIXME: Variadic templates. 66 ExprBits.ContainsUnexpandedParameterPack = false; 67 setType(T); 68 } 69 70 /// \brief Construct an empty expression. 71 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 72 73public: 74 QualType getType() const { return TR; } 75 void setType(QualType t) { 76 // In C++, the type of an expression is always adjusted so that it 77 // will not have reference type an expression will never have 78 // reference type (C++ [expr]p6). Use 79 // QualType::getNonReferenceType() to retrieve the non-reference 80 // type. Additionally, inspect Expr::isLvalue to determine whether 81 // an expression that is adjusted in this manner should be 82 // considered an lvalue. 83 assert((t.isNull() || !t->isReferenceType()) && 84 "Expressions can't have reference type"); 85 86 TR = t; 87 } 88 89 /// isValueDependent - Determines whether this expression is 90 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 91 /// array bound of "Chars" in the following example is 92 /// value-dependent. 93 /// @code 94 /// template<int Size, char (&Chars)[Size]> struct meta_string; 95 /// @endcode 96 bool isValueDependent() const { return ExprBits.ValueDependent; } 97 98 /// \brief Set whether this expression is value-dependent or not. 99 void setValueDependent(bool VD) { ExprBits.ValueDependent = VD; } 100 101 /// isTypeDependent - Determines whether this expression is 102 /// type-dependent (C++ [temp.dep.expr]), which means that its type 103 /// could change from one template instantiation to the next. For 104 /// example, the expressions "x" and "x + y" are type-dependent in 105 /// the following code, but "y" is not type-dependent: 106 /// @code 107 /// template<typename T> 108 /// void add(T x, int y) { 109 /// x + y; 110 /// } 111 /// @endcode 112 bool isTypeDependent() const { return ExprBits.TypeDependent; } 113 114 /// \brief Set whether this expression is type-dependent or not. 115 void setTypeDependent(bool TD) { ExprBits.TypeDependent = TD; } 116 117 /// \brief Whether this expression contains an unexpanded parameter 118 /// pack (for C++0x variadic templates). 119 /// 120 /// Given the following function template: 121 /// 122 /// \code 123 /// template<typename F, typename ...Types> 124 /// void forward(const F &f, Types &&...args) { 125 /// f(static_cast<Types&&>(args)...); 126 /// } 127 /// \endcode 128 /// 129 /// The expressions \c args and \c static_cast<Types&&>(args) both 130 /// contain parameter packs. 131 bool containsUnexpandedParameterPack() const { 132 return ExprBits.ContainsUnexpandedParameterPack; 133 } 134 135 /// SourceLocation tokens are not useful in isolation - they are low level 136 /// value objects created/interpreted by SourceManager. We assume AST 137 /// clients will have a pointer to the respective SourceManager. 138 virtual SourceRange getSourceRange() const = 0; 139 140 /// getExprLoc - Return the preferred location for the arrow when diagnosing 141 /// a problem with a generic expression. 142 virtual SourceLocation getExprLoc() const { return getLocStart(); } 143 144 /// isUnusedResultAWarning - Return true if this immediate expression should 145 /// be warned about if the result is unused. If so, fill in Loc and Ranges 146 /// with location to warn on and the source range[s] to report with the 147 /// warning. 148 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 149 SourceRange &R2, ASTContext &Ctx) const; 150 151 /// isLValue - True if this expression is an "l-value" according to 152 /// the rules of the current language. C and C++ give somewhat 153 /// different rules for this concept, but in general, the result of 154 /// an l-value expression identifies a specific object whereas the 155 /// result of an r-value expression is a value detached from any 156 /// specific storage. 157 /// 158 /// C++0x divides the concept of "r-value" into pure r-values 159 /// ("pr-values") and so-called expiring values ("x-values"), which 160 /// identify specific objects that can be safely cannibalized for 161 /// their resources. This is an unfortunate abuse of terminology on 162 /// the part of the C++ committee. In Clang, when we say "r-value", 163 /// we generally mean a pr-value. 164 bool isLValue() const { return getValueKind() == VK_LValue; } 165 bool isRValue() const { return getValueKind() == VK_RValue; } 166 bool isXValue() const { return getValueKind() == VK_XValue; } 167 bool isGLValue() const { return getValueKind() != VK_RValue; } 168 169 enum LValueClassification { 170 LV_Valid, 171 LV_NotObjectType, 172 LV_IncompleteVoidType, 173 LV_DuplicateVectorComponents, 174 LV_InvalidExpression, 175 LV_MemberFunction, 176 LV_SubObjCPropertySetting, 177 LV_ClassTemporary 178 }; 179 /// Reasons why an expression might not be an l-value. 180 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 181 182 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 183 /// does not have an incomplete type, does not have a const-qualified type, 184 /// and if it is a structure or union, does not have any member (including, 185 /// recursively, any member or element of all contained aggregates or unions) 186 /// with a const-qualified type. 187 /// 188 /// \param Loc [in] [out] - A source location which *may* be filled 189 /// in with the location of the expression making this a 190 /// non-modifiable lvalue, if specified. 191 enum isModifiableLvalueResult { 192 MLV_Valid, 193 MLV_NotObjectType, 194 MLV_IncompleteVoidType, 195 MLV_DuplicateVectorComponents, 196 MLV_InvalidExpression, 197 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 198 MLV_IncompleteType, 199 MLV_ConstQualified, 200 MLV_ArrayType, 201 MLV_NotBlockQualified, 202 MLV_ReadonlyProperty, 203 MLV_NoSetterProperty, 204 MLV_MemberFunction, 205 MLV_SubObjCPropertySetting, 206 MLV_ClassTemporary 207 }; 208 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 209 SourceLocation *Loc = 0) const; 210 211 /// \brief The return type of classify(). Represents the C++0x expression 212 /// taxonomy. 213 class Classification { 214 public: 215 /// \brief The various classification results. Most of these mean prvalue. 216 enum Kinds { 217 CL_LValue, 218 CL_XValue, 219 CL_Function, // Functions cannot be lvalues in C. 220 CL_Void, // Void cannot be an lvalue in C. 221 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 222 CL_MemberFunction, // An expression referring to a member function 223 CL_SubObjCPropertySetting, 224 CL_ClassTemporary, // A prvalue of class type 225 CL_PRValue // A prvalue for any other reason, of any other type 226 }; 227 /// \brief The results of modification testing. 228 enum ModifiableType { 229 CM_Untested, // testModifiable was false. 230 CM_Modifiable, 231 CM_RValue, // Not modifiable because it's an rvalue 232 CM_Function, // Not modifiable because it's a function; C++ only 233 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 234 CM_NotBlockQualified, // Not captured in the closure 235 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 236 CM_ConstQualified, 237 CM_ArrayType, 238 CM_IncompleteType 239 }; 240 241 private: 242 friend class Expr; 243 244 unsigned short Kind; 245 unsigned short Modifiable; 246 247 explicit Classification(Kinds k, ModifiableType m) 248 : Kind(k), Modifiable(m) 249 {} 250 251 public: 252 Classification() {} 253 254 Kinds getKind() const { return static_cast<Kinds>(Kind); } 255 ModifiableType getModifiable() const { 256 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 257 return static_cast<ModifiableType>(Modifiable); 258 } 259 bool isLValue() const { return Kind == CL_LValue; } 260 bool isXValue() const { return Kind == CL_XValue; } 261 bool isGLValue() const { return Kind <= CL_XValue; } 262 bool isPRValue() const { return Kind >= CL_Function; } 263 bool isRValue() const { return Kind >= CL_XValue; } 264 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 265 }; 266 /// \brief Classify - Classify this expression according to the C++0x 267 /// expression taxonomy. 268 /// 269 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 270 /// old lvalue vs rvalue. This function determines the type of expression this 271 /// is. There are three expression types: 272 /// - lvalues are classical lvalues as in C++03. 273 /// - prvalues are equivalent to rvalues in C++03. 274 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 275 /// function returning an rvalue reference. 276 /// lvalues and xvalues are collectively referred to as glvalues, while 277 /// prvalues and xvalues together form rvalues. 278 Classification Classify(ASTContext &Ctx) const { 279 return ClassifyImpl(Ctx, 0); 280 } 281 282 /// \brief ClassifyModifiable - Classify this expression according to the 283 /// C++0x expression taxonomy, and see if it is valid on the left side 284 /// of an assignment. 285 /// 286 /// This function extends classify in that it also tests whether the 287 /// expression is modifiable (C99 6.3.2.1p1). 288 /// \param Loc A source location that might be filled with a relevant location 289 /// if the expression is not modifiable. 290 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 291 return ClassifyImpl(Ctx, &Loc); 292 } 293 294 /// getValueKindForType - Given a formal return or parameter type, 295 /// give its value kind. 296 static ExprValueKind getValueKindForType(QualType T) { 297 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 298 return (isa<LValueReferenceType>(RT) 299 ? VK_LValue 300 : (RT->getPointeeType()->isFunctionType() 301 ? VK_LValue : VK_XValue)); 302 return VK_RValue; 303 } 304 305 /// getValueKind - The value kind that this expression produces. 306 ExprValueKind getValueKind() const { 307 return static_cast<ExprValueKind>(ExprBits.ValueKind); 308 } 309 310 /// getObjectKind - The object kind that this expression produces. 311 /// Object kinds are meaningful only for expressions that yield an 312 /// l-value or x-value. 313 ExprObjectKind getObjectKind() const { 314 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 315 } 316 317 /// setValueKind - Set the value kind produced by this expression. 318 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 319 320 /// setObjectKind - Set the object kind produced by this expression. 321 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 322 323private: 324 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 325 326public: 327 328 /// \brief If this expression refers to a bit-field, retrieve the 329 /// declaration of that bit-field. 330 FieldDecl *getBitField(); 331 332 const FieldDecl *getBitField() const { 333 return const_cast<Expr*>(this)->getBitField(); 334 } 335 336 /// \brief If this expression is an l-value for an Objective C 337 /// property, find the underlying property reference expression. 338 const ObjCPropertyRefExpr *getObjCProperty() const; 339 340 /// \brief Returns whether this expression refers to a vector element. 341 bool refersToVectorElement() const; 342 343 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 344 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 345 /// but also int expressions which are produced by things like comparisons in 346 /// C. 347 bool isKnownToHaveBooleanValue() const; 348 349 /// isIntegerConstantExpr - Return true if this expression is a valid integer 350 /// constant expression, and, if so, return its value in Result. If not a 351 /// valid i-c-e, return false and fill in Loc (if specified) with the location 352 /// of the invalid expression. 353 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 354 SourceLocation *Loc = 0, 355 bool isEvaluated = true) const; 356 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 357 llvm::APSInt X; 358 return isIntegerConstantExpr(X, Ctx, Loc); 359 } 360 /// isConstantInitializer - Returns true if this expression is a constant 361 /// initializer, which can be emitted at compile-time. 362 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 363 364 /// EvalResult is a struct with detailed info about an evaluated expression. 365 struct EvalResult { 366 /// Val - This is the value the expression can be folded to. 367 APValue Val; 368 369 /// HasSideEffects - Whether the evaluated expression has side effects. 370 /// For example, (f() && 0) can be folded, but it still has side effects. 371 bool HasSideEffects; 372 373 /// Diag - If the expression is unfoldable, then Diag contains a note 374 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 375 /// position for the error, and DiagExpr is the expression that caused 376 /// the error. 377 /// If the expression is foldable, but not an integer constant expression, 378 /// Diag contains a note diagnostic that describes why it isn't an integer 379 /// constant expression. If the expression *is* an integer constant 380 /// expression, then Diag will be zero. 381 unsigned Diag; 382 const Expr *DiagExpr; 383 SourceLocation DiagLoc; 384 385 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 386 387 // isGlobalLValue - Return true if the evaluated lvalue expression 388 // is global. 389 bool isGlobalLValue() const; 390 // hasSideEffects - Return true if the evaluated expression has 391 // side effects. 392 bool hasSideEffects() const { 393 return HasSideEffects; 394 } 395 }; 396 397 /// Evaluate - Return true if this is a constant which we can fold using 398 /// any crazy technique (that has nothing to do with language standards) that 399 /// we want to. If this function returns true, it returns the folded constant 400 /// in Result. 401 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 402 403 /// EvaluateAsBooleanCondition - Return true if this is a constant 404 /// which we we can fold and convert to a boolean condition using 405 /// any crazy technique that we want to. 406 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 407 408 /// isEvaluatable - Call Evaluate to see if this expression can be constant 409 /// folded, but discard the result. 410 bool isEvaluatable(ASTContext &Ctx) const; 411 412 /// HasSideEffects - This routine returns true for all those expressions 413 /// which must be evaluated each time and must not be optimized away 414 /// or evaluated at compile time. Example is a function call, volatile 415 /// variable read. 416 bool HasSideEffects(ASTContext &Ctx) const; 417 418 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 419 /// must be called on an expression that constant folds to an integer. 420 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 421 422 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 423 /// with link time known address. 424 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 425 426 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 427 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 428 429 /// \brief Enumeration used to describe how \c isNullPointerConstant() 430 /// should cope with value-dependent expressions. 431 enum NullPointerConstantValueDependence { 432 /// \brief Specifies that the expression should never be value-dependent. 433 NPC_NeverValueDependent = 0, 434 435 /// \brief Specifies that a value-dependent expression of integral or 436 /// dependent type should be considered a null pointer constant. 437 NPC_ValueDependentIsNull, 438 439 /// \brief Specifies that a value-dependent expression should be considered 440 /// to never be a null pointer constant. 441 NPC_ValueDependentIsNotNull 442 }; 443 444 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 445 /// integer constant expression with the value zero, or if this is one that is 446 /// cast to void*. 447 bool isNullPointerConstant(ASTContext &Ctx, 448 NullPointerConstantValueDependence NPC) const; 449 450 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 451 /// write barrier. 452 bool isOBJCGCCandidate(ASTContext &Ctx) const; 453 454 /// \brief Returns true if this expression is a bound member function. 455 bool isBoundMemberFunction(ASTContext &Ctx) const; 456 457 /// \brief Result type of CanThrow(). 458 enum CanThrowResult { 459 CT_Cannot, 460 CT_Dependent, 461 CT_Can 462 }; 463 /// \brief Test if this expression, if evaluated, might throw, according to 464 /// the rules of C++ [expr.unary.noexcept]. 465 CanThrowResult CanThrow(ASTContext &C) const; 466 467 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 468 /// its subexpression. If that subexpression is also a ParenExpr, 469 /// then this method recursively returns its subexpression, and so forth. 470 /// Otherwise, the method returns the current Expr. 471 Expr *IgnoreParens(); 472 473 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 474 /// or CastExprs, returning their operand. 475 Expr *IgnoreParenCasts(); 476 477 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 478 /// ParenExpr or ImplicitCastExprs, returning their operand. 479 Expr *IgnoreParenImpCasts(); 480 481 const Expr *IgnoreParenImpCasts() const { 482 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 483 } 484 485 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 486 /// CastExprs that represent lvalue casts, returning their operand. 487 Expr *IgnoreParenLValueCasts(); 488 489 const Expr *IgnoreParenLValueCasts() const { 490 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 491 } 492 493 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 494 /// value (including ptr->int casts of the same size). Strip off any 495 /// ParenExpr or CastExprs, returning their operand. 496 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 497 498 /// \brief Determine whether this expression is a default function argument. 499 /// 500 /// Default arguments are implicitly generated in the abstract syntax tree 501 /// by semantic analysis for function calls, object constructions, etc. in 502 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 503 /// this routine also looks through any implicit casts to determine whether 504 /// the expression is a default argument. 505 bool isDefaultArgument() const; 506 507 /// \brief Determine whether the result of this expression is a 508 /// temporary object of the given class type. 509 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 510 511 const Expr *IgnoreParens() const { 512 return const_cast<Expr*>(this)->IgnoreParens(); 513 } 514 const Expr *IgnoreParenCasts() const { 515 return const_cast<Expr*>(this)->IgnoreParenCasts(); 516 } 517 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 518 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 519 } 520 521 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 522 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 523 524 static bool classof(const Stmt *T) { 525 return T->getStmtClass() >= firstExprConstant && 526 T->getStmtClass() <= lastExprConstant; 527 } 528 static bool classof(const Expr *) { return true; } 529}; 530 531 532//===----------------------------------------------------------------------===// 533// Primary Expressions. 534//===----------------------------------------------------------------------===// 535 536/// \brief Represents the qualifier that may precede a C++ name, e.g., the 537/// "std::" in "std::sort". 538struct NameQualifier { 539 /// \brief The nested name specifier. 540 NestedNameSpecifier *NNS; 541 542 /// \brief The source range covered by the nested name specifier. 543 SourceRange Range; 544}; 545 546/// \brief Represents an explicit template argument list in C++, e.g., 547/// the "<int>" in "sort<int>". 548struct ExplicitTemplateArgumentList { 549 /// \brief The source location of the left angle bracket ('<'); 550 SourceLocation LAngleLoc; 551 552 /// \brief The source location of the right angle bracket ('>'); 553 SourceLocation RAngleLoc; 554 555 /// \brief The number of template arguments in TemplateArgs. 556 /// The actual template arguments (if any) are stored after the 557 /// ExplicitTemplateArgumentList structure. 558 unsigned NumTemplateArgs; 559 560 /// \brief Retrieve the template arguments 561 TemplateArgumentLoc *getTemplateArgs() { 562 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 563 } 564 565 /// \brief Retrieve the template arguments 566 const TemplateArgumentLoc *getTemplateArgs() const { 567 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 568 } 569 570 void initializeFrom(const TemplateArgumentListInfo &List); 571 void copyInto(TemplateArgumentListInfo &List) const; 572 static std::size_t sizeFor(unsigned NumTemplateArgs); 573 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 574}; 575 576/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 577/// enum, etc. 578class DeclRefExpr : public Expr { 579 enum { 580 // Flag on DecoratedD that specifies when this declaration reference 581 // expression has a C++ nested-name-specifier. 582 HasQualifierFlag = 0x01, 583 // Flag on DecoratedD that specifies when this declaration reference 584 // expression has an explicit C++ template argument list. 585 HasExplicitTemplateArgumentListFlag = 0x02 586 }; 587 588 // DecoratedD - The declaration that we are referencing, plus two bits to 589 // indicate whether (1) the declaration's name was explicitly qualified and 590 // (2) the declaration's name was followed by an explicit template 591 // argument list. 592 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 593 594 // Loc - The location of the declaration name itself. 595 SourceLocation Loc; 596 597 /// DNLoc - Provides source/type location info for the 598 /// declaration name embedded in DecoratedD. 599 DeclarationNameLoc DNLoc; 600 601 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 602 NameQualifier *getNameQualifier() { 603 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 604 return 0; 605 606 return reinterpret_cast<NameQualifier *> (this + 1); 607 } 608 609 /// \brief Retrieve the qualifier that preceded the member name, if any. 610 const NameQualifier *getNameQualifier() const { 611 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 612 } 613 614 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 615 ValueDecl *D, SourceLocation NameLoc, 616 const TemplateArgumentListInfo *TemplateArgs, 617 QualType T, ExprValueKind VK); 618 619 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 620 ValueDecl *D, const DeclarationNameInfo &NameInfo, 621 const TemplateArgumentListInfo *TemplateArgs, 622 QualType T, ExprValueKind VK); 623 624 /// \brief Construct an empty declaration reference expression. 625 explicit DeclRefExpr(EmptyShell Empty) 626 : Expr(DeclRefExprClass, Empty) { } 627 628 /// \brief Computes the type- and value-dependence flags for this 629 /// declaration reference expression. 630 void computeDependence(); 631 632public: 633 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 634 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false), 635 DecoratedD(d, 0), Loc(l) { 636 computeDependence(); 637 } 638 639 static DeclRefExpr *Create(ASTContext &Context, 640 NestedNameSpecifier *Qualifier, 641 SourceRange QualifierRange, 642 ValueDecl *D, 643 SourceLocation NameLoc, 644 QualType T, ExprValueKind VK, 645 const TemplateArgumentListInfo *TemplateArgs = 0); 646 647 static DeclRefExpr *Create(ASTContext &Context, 648 NestedNameSpecifier *Qualifier, 649 SourceRange QualifierRange, 650 ValueDecl *D, 651 const DeclarationNameInfo &NameInfo, 652 QualType T, ExprValueKind VK, 653 const TemplateArgumentListInfo *TemplateArgs = 0); 654 655 /// \brief Construct an empty declaration reference expression. 656 static DeclRefExpr *CreateEmpty(ASTContext &Context, 657 bool HasQualifier, unsigned NumTemplateArgs); 658 659 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 660 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 661 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 662 663 DeclarationNameInfo getNameInfo() const { 664 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 665 } 666 667 SourceLocation getLocation() const { return Loc; } 668 void setLocation(SourceLocation L) { Loc = L; } 669 virtual SourceRange getSourceRange() const; 670 671 /// \brief Determine whether this declaration reference was preceded by a 672 /// C++ nested-name-specifier, e.g., \c N::foo. 673 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 674 675 /// \brief If the name was qualified, retrieves the source range of 676 /// the nested-name-specifier that precedes the name. Otherwise, 677 /// returns an empty source range. 678 SourceRange getQualifierRange() const { 679 if (!hasQualifier()) 680 return SourceRange(); 681 682 return getNameQualifier()->Range; 683 } 684 685 /// \brief If the name was qualified, retrieves the nested-name-specifier 686 /// that precedes the name. Otherwise, returns NULL. 687 NestedNameSpecifier *getQualifier() const { 688 if (!hasQualifier()) 689 return 0; 690 691 return getNameQualifier()->NNS; 692 } 693 694 bool hasExplicitTemplateArgs() const { 695 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 696 } 697 698 /// \brief Retrieve the explicit template argument list that followed the 699 /// member template name. 700 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 701 assert(hasExplicitTemplateArgs()); 702 703 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 704 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 705 706 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 707 getNameQualifier() + 1); 708 } 709 710 /// \brief Retrieve the explicit template argument list that followed the 711 /// member template name. 712 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 713 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 714 } 715 716 /// \brief Retrieves the optional explicit template arguments. 717 /// This points to the same data as getExplicitTemplateArgs(), but 718 /// returns null if there are no explicit template arguments. 719 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 720 if (!hasExplicitTemplateArgs()) return 0; 721 return &getExplicitTemplateArgs(); 722 } 723 724 /// \brief Copies the template arguments (if present) into the given 725 /// structure. 726 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 727 if (hasExplicitTemplateArgs()) 728 getExplicitTemplateArgs().copyInto(List); 729 } 730 731 /// \brief Retrieve the location of the left angle bracket following the 732 /// member name ('<'), if any. 733 SourceLocation getLAngleLoc() const { 734 if (!hasExplicitTemplateArgs()) 735 return SourceLocation(); 736 737 return getExplicitTemplateArgs().LAngleLoc; 738 } 739 740 /// \brief Retrieve the template arguments provided as part of this 741 /// template-id. 742 const TemplateArgumentLoc *getTemplateArgs() const { 743 if (!hasExplicitTemplateArgs()) 744 return 0; 745 746 return getExplicitTemplateArgs().getTemplateArgs(); 747 } 748 749 /// \brief Retrieve the number of template arguments provided as part of this 750 /// template-id. 751 unsigned getNumTemplateArgs() const { 752 if (!hasExplicitTemplateArgs()) 753 return 0; 754 755 return getExplicitTemplateArgs().NumTemplateArgs; 756 } 757 758 /// \brief Retrieve the location of the right angle bracket following the 759 /// template arguments ('>'). 760 SourceLocation getRAngleLoc() const { 761 if (!hasExplicitTemplateArgs()) 762 return SourceLocation(); 763 764 return getExplicitTemplateArgs().RAngleLoc; 765 } 766 767 static bool classof(const Stmt *T) { 768 return T->getStmtClass() == DeclRefExprClass; 769 } 770 static bool classof(const DeclRefExpr *) { return true; } 771 772 // Iterators 773 virtual child_iterator child_begin(); 774 virtual child_iterator child_end(); 775 776 friend class ASTStmtReader; 777 friend class ASTStmtWriter; 778}; 779 780/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 781class PredefinedExpr : public Expr { 782public: 783 enum IdentType { 784 Func, 785 Function, 786 PrettyFunction, 787 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 788 /// 'virtual' keyword is omitted for virtual member functions. 789 PrettyFunctionNoVirtual 790 }; 791 792private: 793 SourceLocation Loc; 794 IdentType Type; 795public: 796 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 797 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 798 type->isDependentType(), type->isDependentType()), 799 Loc(l), Type(IT) {} 800 801 /// \brief Construct an empty predefined expression. 802 explicit PredefinedExpr(EmptyShell Empty) 803 : Expr(PredefinedExprClass, Empty) { } 804 805 IdentType getIdentType() const { return Type; } 806 void setIdentType(IdentType IT) { Type = IT; } 807 808 SourceLocation getLocation() const { return Loc; } 809 void setLocation(SourceLocation L) { Loc = L; } 810 811 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 812 813 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 814 815 static bool classof(const Stmt *T) { 816 return T->getStmtClass() == PredefinedExprClass; 817 } 818 static bool classof(const PredefinedExpr *) { return true; } 819 820 // Iterators 821 virtual child_iterator child_begin(); 822 virtual child_iterator child_end(); 823}; 824 825/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 826/// leaking memory. 827/// 828/// For large floats/integers, APFloat/APInt will allocate memory from the heap 829/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 830/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 831/// the APFloat/APInt values will never get freed. APNumericStorage uses 832/// ASTContext's allocator for memory allocation. 833class APNumericStorage { 834 unsigned BitWidth; 835 union { 836 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 837 uint64_t *pVal; ///< Used to store the >64 bits integer value. 838 }; 839 840 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 841 842 APNumericStorage(const APNumericStorage&); // do not implement 843 APNumericStorage& operator=(const APNumericStorage&); // do not implement 844 845protected: 846 APNumericStorage() : BitWidth(0), VAL(0) { } 847 848 llvm::APInt getIntValue() const { 849 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 850 if (NumWords > 1) 851 return llvm::APInt(BitWidth, NumWords, pVal); 852 else 853 return llvm::APInt(BitWidth, VAL); 854 } 855 void setIntValue(ASTContext &C, const llvm::APInt &Val); 856}; 857 858class APIntStorage : public APNumericStorage { 859public: 860 llvm::APInt getValue() const { return getIntValue(); } 861 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 862}; 863 864class APFloatStorage : public APNumericStorage { 865public: 866 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 867 void setValue(ASTContext &C, const llvm::APFloat &Val) { 868 setIntValue(C, Val.bitcastToAPInt()); 869 } 870}; 871 872class IntegerLiteral : public Expr { 873 APIntStorage Num; 874 SourceLocation Loc; 875 876 /// \brief Construct an empty integer literal. 877 explicit IntegerLiteral(EmptyShell Empty) 878 : Expr(IntegerLiteralClass, Empty) { } 879 880public: 881 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 882 // or UnsignedLongLongTy 883 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 884 QualType type, SourceLocation l) 885 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false), 886 Loc(l) { 887 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 888 setValue(C, V); 889 } 890 891 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 892 // or UnsignedLongLongTy 893 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 894 QualType type, SourceLocation l); 895 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 896 897 llvm::APInt getValue() const { return Num.getValue(); } 898 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 899 900 /// \brief Retrieve the location of the literal. 901 SourceLocation getLocation() const { return Loc; } 902 903 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 904 void setLocation(SourceLocation Location) { Loc = Location; } 905 906 static bool classof(const Stmt *T) { 907 return T->getStmtClass() == IntegerLiteralClass; 908 } 909 static bool classof(const IntegerLiteral *) { return true; } 910 911 // Iterators 912 virtual child_iterator child_begin(); 913 virtual child_iterator child_end(); 914}; 915 916class CharacterLiteral : public Expr { 917 unsigned Value; 918 SourceLocation Loc; 919 bool IsWide; 920public: 921 // type should be IntTy 922 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 923 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false), 924 Value(value), Loc(l), IsWide(iswide) { 925 } 926 927 /// \brief Construct an empty character literal. 928 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 929 930 SourceLocation getLocation() const { return Loc; } 931 bool isWide() const { return IsWide; } 932 933 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 934 935 unsigned getValue() const { return Value; } 936 937 void setLocation(SourceLocation Location) { Loc = Location; } 938 void setWide(bool W) { IsWide = W; } 939 void setValue(unsigned Val) { Value = Val; } 940 941 static bool classof(const Stmt *T) { 942 return T->getStmtClass() == CharacterLiteralClass; 943 } 944 static bool classof(const CharacterLiteral *) { return true; } 945 946 // Iterators 947 virtual child_iterator child_begin(); 948 virtual child_iterator child_end(); 949}; 950 951class FloatingLiteral : public Expr { 952 APFloatStorage Num; 953 bool IsExact : 1; 954 SourceLocation Loc; 955 956 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 957 QualType Type, SourceLocation L) 958 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false), 959 IsExact(isexact), Loc(L) { 960 setValue(C, V); 961 } 962 963 /// \brief Construct an empty floating-point literal. 964 explicit FloatingLiteral(EmptyShell Empty) 965 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 966 967public: 968 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 969 bool isexact, QualType Type, SourceLocation L); 970 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 971 972 llvm::APFloat getValue() const { return Num.getValue(); } 973 void setValue(ASTContext &C, const llvm::APFloat &Val) { 974 Num.setValue(C, Val); 975 } 976 977 bool isExact() const { return IsExact; } 978 void setExact(bool E) { IsExact = E; } 979 980 /// getValueAsApproximateDouble - This returns the value as an inaccurate 981 /// double. Note that this may cause loss of precision, but is useful for 982 /// debugging dumps, etc. 983 double getValueAsApproximateDouble() const; 984 985 SourceLocation getLocation() const { return Loc; } 986 void setLocation(SourceLocation L) { Loc = L; } 987 988 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 989 990 static bool classof(const Stmt *T) { 991 return T->getStmtClass() == FloatingLiteralClass; 992 } 993 static bool classof(const FloatingLiteral *) { return true; } 994 995 // Iterators 996 virtual child_iterator child_begin(); 997 virtual child_iterator child_end(); 998}; 999 1000/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1001/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1002/// IntegerLiteral classes. Instances of this class always have a Complex type 1003/// whose element type matches the subexpression. 1004/// 1005class ImaginaryLiteral : public Expr { 1006 Stmt *Val; 1007public: 1008 ImaginaryLiteral(Expr *val, QualType Ty) 1009 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false), 1010 Val(val) {} 1011 1012 /// \brief Build an empty imaginary literal. 1013 explicit ImaginaryLiteral(EmptyShell Empty) 1014 : Expr(ImaginaryLiteralClass, Empty) { } 1015 1016 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1017 Expr *getSubExpr() { return cast<Expr>(Val); } 1018 void setSubExpr(Expr *E) { Val = E; } 1019 1020 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 1021 static bool classof(const Stmt *T) { 1022 return T->getStmtClass() == ImaginaryLiteralClass; 1023 } 1024 static bool classof(const ImaginaryLiteral *) { return true; } 1025 1026 // Iterators 1027 virtual child_iterator child_begin(); 1028 virtual child_iterator child_end(); 1029}; 1030 1031/// StringLiteral - This represents a string literal expression, e.g. "foo" 1032/// or L"bar" (wide strings). The actual string is returned by getStrData() 1033/// is NOT null-terminated, and the length of the string is determined by 1034/// calling getByteLength(). The C type for a string is always a 1035/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1036/// not. 1037/// 1038/// Note that strings in C can be formed by concatenation of multiple string 1039/// literal pptokens in translation phase #6. This keeps track of the locations 1040/// of each of these pieces. 1041/// 1042/// Strings in C can also be truncated and extended by assigning into arrays, 1043/// e.g. with constructs like: 1044/// char X[2] = "foobar"; 1045/// In this case, getByteLength() will return 6, but the string literal will 1046/// have type "char[2]". 1047class StringLiteral : public Expr { 1048 const char *StrData; 1049 unsigned ByteLength; 1050 bool IsWide; 1051 unsigned NumConcatenated; 1052 SourceLocation TokLocs[1]; 1053 1054 StringLiteral(QualType Ty) : 1055 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false) {} 1056 1057public: 1058 /// This is the "fully general" constructor that allows representation of 1059 /// strings formed from multiple concatenated tokens. 1060 static StringLiteral *Create(ASTContext &C, const char *StrData, 1061 unsigned ByteLength, bool Wide, QualType Ty, 1062 const SourceLocation *Loc, unsigned NumStrs); 1063 1064 /// Simple constructor for string literals made from one token. 1065 static StringLiteral *Create(ASTContext &C, const char *StrData, 1066 unsigned ByteLength, 1067 bool Wide, QualType Ty, SourceLocation Loc) { 1068 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1069 } 1070 1071 /// \brief Construct an empty string literal. 1072 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1073 1074 llvm::StringRef getString() const { 1075 return llvm::StringRef(StrData, ByteLength); 1076 } 1077 1078 unsigned getByteLength() const { return ByteLength; } 1079 1080 /// \brief Sets the string data to the given string data. 1081 void setString(ASTContext &C, llvm::StringRef Str); 1082 1083 bool isWide() const { return IsWide; } 1084 void setWide(bool W) { IsWide = W; } 1085 1086 bool containsNonAsciiOrNull() const { 1087 llvm::StringRef Str = getString(); 1088 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1089 if (!isascii(Str[i]) || !Str[i]) 1090 return true; 1091 return false; 1092 } 1093 /// getNumConcatenated - Get the number of string literal tokens that were 1094 /// concatenated in translation phase #6 to form this string literal. 1095 unsigned getNumConcatenated() const { return NumConcatenated; } 1096 1097 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1098 assert(TokNum < NumConcatenated && "Invalid tok number"); 1099 return TokLocs[TokNum]; 1100 } 1101 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1102 assert(TokNum < NumConcatenated && "Invalid tok number"); 1103 TokLocs[TokNum] = L; 1104 } 1105 1106 /// getLocationOfByte - Return a source location that points to the specified 1107 /// byte of this string literal. 1108 /// 1109 /// Strings are amazingly complex. They can be formed from multiple tokens 1110 /// and can have escape sequences in them in addition to the usual trigraph 1111 /// and escaped newline business. This routine handles this complexity. 1112 /// 1113 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1114 const LangOptions &Features, 1115 const TargetInfo &Target) const; 1116 1117 typedef const SourceLocation *tokloc_iterator; 1118 tokloc_iterator tokloc_begin() const { return TokLocs; } 1119 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1120 1121 virtual SourceRange getSourceRange() const { 1122 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1123 } 1124 static bool classof(const Stmt *T) { 1125 return T->getStmtClass() == StringLiteralClass; 1126 } 1127 static bool classof(const StringLiteral *) { return true; } 1128 1129 // Iterators 1130 virtual child_iterator child_begin(); 1131 virtual child_iterator child_end(); 1132}; 1133 1134/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1135/// AST node is only formed if full location information is requested. 1136class ParenExpr : public Expr { 1137 SourceLocation L, R; 1138 Stmt *Val; 1139public: 1140 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1141 : Expr(ParenExprClass, val->getType(), 1142 val->getValueKind(), val->getObjectKind(), 1143 val->isTypeDependent(), val->isValueDependent()), 1144 L(l), R(r), Val(val) {} 1145 1146 /// \brief Construct an empty parenthesized expression. 1147 explicit ParenExpr(EmptyShell Empty) 1148 : Expr(ParenExprClass, Empty) { } 1149 1150 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1151 Expr *getSubExpr() { return cast<Expr>(Val); } 1152 void setSubExpr(Expr *E) { Val = E; } 1153 1154 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1155 1156 /// \brief Get the location of the left parentheses '('. 1157 SourceLocation getLParen() const { return L; } 1158 void setLParen(SourceLocation Loc) { L = Loc; } 1159 1160 /// \brief Get the location of the right parentheses ')'. 1161 SourceLocation getRParen() const { return R; } 1162 void setRParen(SourceLocation Loc) { R = Loc; } 1163 1164 static bool classof(const Stmt *T) { 1165 return T->getStmtClass() == ParenExprClass; 1166 } 1167 static bool classof(const ParenExpr *) { return true; } 1168 1169 // Iterators 1170 virtual child_iterator child_begin(); 1171 virtual child_iterator child_end(); 1172}; 1173 1174 1175/// UnaryOperator - This represents the unary-expression's (except sizeof and 1176/// alignof), the postinc/postdec operators from postfix-expression, and various 1177/// extensions. 1178/// 1179/// Notes on various nodes: 1180/// 1181/// Real/Imag - These return the real/imag part of a complex operand. If 1182/// applied to a non-complex value, the former returns its operand and the 1183/// later returns zero in the type of the operand. 1184/// 1185class UnaryOperator : public Expr { 1186public: 1187 typedef UnaryOperatorKind Opcode; 1188 1189private: 1190 unsigned Opc : 5; 1191 SourceLocation Loc; 1192 Stmt *Val; 1193public: 1194 1195 UnaryOperator(Expr *input, Opcode opc, QualType type, 1196 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1197 : Expr(UnaryOperatorClass, type, VK, OK, 1198 input->isTypeDependent() || type->isDependentType(), 1199 input->isValueDependent()), 1200 Opc(opc), Loc(l), Val(input) {} 1201 1202 /// \brief Build an empty unary operator. 1203 explicit UnaryOperator(EmptyShell Empty) 1204 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1205 1206 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1207 void setOpcode(Opcode O) { Opc = O; } 1208 1209 Expr *getSubExpr() const { return cast<Expr>(Val); } 1210 void setSubExpr(Expr *E) { Val = E; } 1211 1212 /// getOperatorLoc - Return the location of the operator. 1213 SourceLocation getOperatorLoc() const { return Loc; } 1214 void setOperatorLoc(SourceLocation L) { Loc = L; } 1215 1216 /// isPostfix - Return true if this is a postfix operation, like x++. 1217 static bool isPostfix(Opcode Op) { 1218 return Op == UO_PostInc || Op == UO_PostDec; 1219 } 1220 1221 /// isPrefix - Return true if this is a prefix operation, like --x. 1222 static bool isPrefix(Opcode Op) { 1223 return Op == UO_PreInc || Op == UO_PreDec; 1224 } 1225 1226 bool isPrefix() const { return isPrefix(getOpcode()); } 1227 bool isPostfix() const { return isPostfix(getOpcode()); } 1228 bool isIncrementOp() const { 1229 return Opc == UO_PreInc || Opc == UO_PostInc; 1230 } 1231 bool isIncrementDecrementOp() const { 1232 return Opc <= UO_PreDec; 1233 } 1234 static bool isArithmeticOp(Opcode Op) { 1235 return Op >= UO_Plus && Op <= UO_LNot; 1236 } 1237 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1238 1239 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1240 /// corresponds to, e.g. "sizeof" or "[pre]++" 1241 static const char *getOpcodeStr(Opcode Op); 1242 1243 /// \brief Retrieve the unary opcode that corresponds to the given 1244 /// overloaded operator. 1245 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1246 1247 /// \brief Retrieve the overloaded operator kind that corresponds to 1248 /// the given unary opcode. 1249 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1250 1251 virtual SourceRange getSourceRange() const { 1252 if (isPostfix()) 1253 return SourceRange(Val->getLocStart(), Loc); 1254 else 1255 return SourceRange(Loc, Val->getLocEnd()); 1256 } 1257 virtual SourceLocation getExprLoc() const { return Loc; } 1258 1259 static bool classof(const Stmt *T) { 1260 return T->getStmtClass() == UnaryOperatorClass; 1261 } 1262 static bool classof(const UnaryOperator *) { return true; } 1263 1264 // Iterators 1265 virtual child_iterator child_begin(); 1266 virtual child_iterator child_end(); 1267}; 1268 1269/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1270/// offsetof(record-type, member-designator). For example, given: 1271/// @code 1272/// struct S { 1273/// float f; 1274/// double d; 1275/// }; 1276/// struct T { 1277/// int i; 1278/// struct S s[10]; 1279/// }; 1280/// @endcode 1281/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1282 1283class OffsetOfExpr : public Expr { 1284public: 1285 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1286 class OffsetOfNode { 1287 public: 1288 /// \brief The kind of offsetof node we have. 1289 enum Kind { 1290 /// \brief An index into an array. 1291 Array = 0x00, 1292 /// \brief A field. 1293 Field = 0x01, 1294 /// \brief A field in a dependent type, known only by its name. 1295 Identifier = 0x02, 1296 /// \brief An implicit indirection through a C++ base class, when the 1297 /// field found is in a base class. 1298 Base = 0x03 1299 }; 1300 1301 private: 1302 enum { MaskBits = 2, Mask = 0x03 }; 1303 1304 /// \brief The source range that covers this part of the designator. 1305 SourceRange Range; 1306 1307 /// \brief The data describing the designator, which comes in three 1308 /// different forms, depending on the lower two bits. 1309 /// - An unsigned index into the array of Expr*'s stored after this node 1310 /// in memory, for [constant-expression] designators. 1311 /// - A FieldDecl*, for references to a known field. 1312 /// - An IdentifierInfo*, for references to a field with a given name 1313 /// when the class type is dependent. 1314 /// - A CXXBaseSpecifier*, for references that look at a field in a 1315 /// base class. 1316 uintptr_t Data; 1317 1318 public: 1319 /// \brief Create an offsetof node that refers to an array element. 1320 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1321 SourceLocation RBracketLoc) 1322 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1323 1324 /// \brief Create an offsetof node that refers to a field. 1325 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1326 SourceLocation NameLoc) 1327 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1328 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1329 1330 /// \brief Create an offsetof node that refers to an identifier. 1331 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1332 SourceLocation NameLoc) 1333 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1334 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1335 1336 /// \brief Create an offsetof node that refers into a C++ base class. 1337 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1338 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1339 1340 /// \brief Determine what kind of offsetof node this is. 1341 Kind getKind() const { 1342 return static_cast<Kind>(Data & Mask); 1343 } 1344 1345 /// \brief For an array element node, returns the index into the array 1346 /// of expressions. 1347 unsigned getArrayExprIndex() const { 1348 assert(getKind() == Array); 1349 return Data >> 2; 1350 } 1351 1352 /// \brief For a field offsetof node, returns the field. 1353 FieldDecl *getField() const { 1354 assert(getKind() == Field); 1355 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1356 } 1357 1358 /// \brief For a field or identifier offsetof node, returns the name of 1359 /// the field. 1360 IdentifierInfo *getFieldName() const; 1361 1362 /// \brief For a base class node, returns the base specifier. 1363 CXXBaseSpecifier *getBase() const { 1364 assert(getKind() == Base); 1365 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1366 } 1367 1368 /// \brief Retrieve the source range that covers this offsetof node. 1369 /// 1370 /// For an array element node, the source range contains the locations of 1371 /// the square brackets. For a field or identifier node, the source range 1372 /// contains the location of the period (if there is one) and the 1373 /// identifier. 1374 SourceRange getRange() const { return Range; } 1375 }; 1376 1377private: 1378 1379 SourceLocation OperatorLoc, RParenLoc; 1380 // Base type; 1381 TypeSourceInfo *TSInfo; 1382 // Number of sub-components (i.e. instances of OffsetOfNode). 1383 unsigned NumComps; 1384 // Number of sub-expressions (i.e. array subscript expressions). 1385 unsigned NumExprs; 1386 1387 OffsetOfExpr(ASTContext &C, QualType type, 1388 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1389 OffsetOfNode* compsPtr, unsigned numComps, 1390 Expr** exprsPtr, unsigned numExprs, 1391 SourceLocation RParenLoc); 1392 1393 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1394 : Expr(OffsetOfExprClass, EmptyShell()), 1395 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1396 1397public: 1398 1399 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1400 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1401 OffsetOfNode* compsPtr, unsigned numComps, 1402 Expr** exprsPtr, unsigned numExprs, 1403 SourceLocation RParenLoc); 1404 1405 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1406 unsigned NumComps, unsigned NumExprs); 1407 1408 /// getOperatorLoc - Return the location of the operator. 1409 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1410 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1411 1412 /// \brief Return the location of the right parentheses. 1413 SourceLocation getRParenLoc() const { return RParenLoc; } 1414 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1415 1416 TypeSourceInfo *getTypeSourceInfo() const { 1417 return TSInfo; 1418 } 1419 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1420 TSInfo = tsi; 1421 } 1422 1423 const OffsetOfNode &getComponent(unsigned Idx) { 1424 assert(Idx < NumComps && "Subscript out of range"); 1425 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1426 } 1427 1428 void setComponent(unsigned Idx, OffsetOfNode ON) { 1429 assert(Idx < NumComps && "Subscript out of range"); 1430 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1431 } 1432 1433 unsigned getNumComponents() const { 1434 return NumComps; 1435 } 1436 1437 Expr* getIndexExpr(unsigned Idx) { 1438 assert(Idx < NumExprs && "Subscript out of range"); 1439 return reinterpret_cast<Expr **>( 1440 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1441 } 1442 1443 void setIndexExpr(unsigned Idx, Expr* E) { 1444 assert(Idx < NumComps && "Subscript out of range"); 1445 reinterpret_cast<Expr **>( 1446 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1447 } 1448 1449 unsigned getNumExpressions() const { 1450 return NumExprs; 1451 } 1452 1453 virtual SourceRange getSourceRange() const { 1454 return SourceRange(OperatorLoc, RParenLoc); 1455 } 1456 1457 static bool classof(const Stmt *T) { 1458 return T->getStmtClass() == OffsetOfExprClass; 1459 } 1460 1461 static bool classof(const OffsetOfExpr *) { return true; } 1462 1463 // Iterators 1464 virtual child_iterator child_begin(); 1465 virtual child_iterator child_end(); 1466}; 1467 1468/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1469/// types and expressions. 1470class SizeOfAlignOfExpr : public Expr { 1471 bool isSizeof : 1; // true if sizeof, false if alignof. 1472 bool isType : 1; // true if operand is a type, false if an expression 1473 union { 1474 TypeSourceInfo *Ty; 1475 Stmt *Ex; 1476 } Argument; 1477 SourceLocation OpLoc, RParenLoc; 1478 1479public: 1480 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1481 QualType resultType, SourceLocation op, 1482 SourceLocation rp) : 1483 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1484 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1485 // Value-dependent if the argument is type-dependent. 1486 TInfo->getType()->isDependentType()), 1487 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1488 Argument.Ty = TInfo; 1489 } 1490 1491 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1492 QualType resultType, SourceLocation op, 1493 SourceLocation rp) : 1494 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1495 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1496 // Value-dependent if the argument is type-dependent. 1497 E->isTypeDependent()), 1498 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1499 Argument.Ex = E; 1500 } 1501 1502 /// \brief Construct an empty sizeof/alignof expression. 1503 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1504 : Expr(SizeOfAlignOfExprClass, Empty) { } 1505 1506 bool isSizeOf() const { return isSizeof; } 1507 void setSizeof(bool S) { isSizeof = S; } 1508 1509 bool isArgumentType() const { return isType; } 1510 QualType getArgumentType() const { 1511 return getArgumentTypeInfo()->getType(); 1512 } 1513 TypeSourceInfo *getArgumentTypeInfo() const { 1514 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1515 return Argument.Ty; 1516 } 1517 Expr *getArgumentExpr() { 1518 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1519 return static_cast<Expr*>(Argument.Ex); 1520 } 1521 const Expr *getArgumentExpr() const { 1522 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1523 } 1524 1525 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1526 void setArgument(TypeSourceInfo *TInfo) { 1527 Argument.Ty = TInfo; 1528 isType = true; 1529 } 1530 1531 /// Gets the argument type, or the type of the argument expression, whichever 1532 /// is appropriate. 1533 QualType getTypeOfArgument() const { 1534 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1535 } 1536 1537 SourceLocation getOperatorLoc() const { return OpLoc; } 1538 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1539 1540 SourceLocation getRParenLoc() const { return RParenLoc; } 1541 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1542 1543 virtual SourceRange getSourceRange() const { 1544 return SourceRange(OpLoc, RParenLoc); 1545 } 1546 1547 static bool classof(const Stmt *T) { 1548 return T->getStmtClass() == SizeOfAlignOfExprClass; 1549 } 1550 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1551 1552 // Iterators 1553 virtual child_iterator child_begin(); 1554 virtual child_iterator child_end(); 1555}; 1556 1557//===----------------------------------------------------------------------===// 1558// Postfix Operators. 1559//===----------------------------------------------------------------------===// 1560 1561/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1562class ArraySubscriptExpr : public Expr { 1563 enum { LHS, RHS, END_EXPR=2 }; 1564 Stmt* SubExprs[END_EXPR]; 1565 SourceLocation RBracketLoc; 1566public: 1567 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1568 ExprValueKind VK, ExprObjectKind OK, 1569 SourceLocation rbracketloc) 1570 : Expr(ArraySubscriptExprClass, t, VK, OK, 1571 lhs->isTypeDependent() || rhs->isTypeDependent(), 1572 lhs->isValueDependent() || rhs->isValueDependent()), 1573 RBracketLoc(rbracketloc) { 1574 SubExprs[LHS] = lhs; 1575 SubExprs[RHS] = rhs; 1576 } 1577 1578 /// \brief Create an empty array subscript expression. 1579 explicit ArraySubscriptExpr(EmptyShell Shell) 1580 : Expr(ArraySubscriptExprClass, Shell) { } 1581 1582 /// An array access can be written A[4] or 4[A] (both are equivalent). 1583 /// - getBase() and getIdx() always present the normalized view: A[4]. 1584 /// In this case getBase() returns "A" and getIdx() returns "4". 1585 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1586 /// 4[A] getLHS() returns "4". 1587 /// Note: Because vector element access is also written A[4] we must 1588 /// predicate the format conversion in getBase and getIdx only on the 1589 /// the type of the RHS, as it is possible for the LHS to be a vector of 1590 /// integer type 1591 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1592 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1593 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1594 1595 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1596 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1597 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1598 1599 Expr *getBase() { 1600 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1601 } 1602 1603 const Expr *getBase() const { 1604 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1605 } 1606 1607 Expr *getIdx() { 1608 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1609 } 1610 1611 const Expr *getIdx() const { 1612 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1613 } 1614 1615 virtual SourceRange getSourceRange() const { 1616 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1617 } 1618 1619 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1620 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1621 1622 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1623 1624 static bool classof(const Stmt *T) { 1625 return T->getStmtClass() == ArraySubscriptExprClass; 1626 } 1627 static bool classof(const ArraySubscriptExpr *) { return true; } 1628 1629 // Iterators 1630 virtual child_iterator child_begin(); 1631 virtual child_iterator child_end(); 1632}; 1633 1634 1635/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1636/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1637/// while its subclasses may represent alternative syntax that (semantically) 1638/// results in a function call. For example, CXXOperatorCallExpr is 1639/// a subclass for overloaded operator calls that use operator syntax, e.g., 1640/// "str1 + str2" to resolve to a function call. 1641class CallExpr : public Expr { 1642 enum { FN=0, ARGS_START=1 }; 1643 Stmt **SubExprs; 1644 unsigned NumArgs; 1645 SourceLocation RParenLoc; 1646 1647protected: 1648 // This version of the constructor is for derived classes. 1649 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1650 QualType t, ExprValueKind VK, SourceLocation rparenloc); 1651 1652public: 1653 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1654 ExprValueKind VK, SourceLocation rparenloc); 1655 1656 /// \brief Build an empty call expression. 1657 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1658 1659 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1660 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1661 void setCallee(Expr *F) { SubExprs[FN] = F; } 1662 1663 Decl *getCalleeDecl(); 1664 const Decl *getCalleeDecl() const { 1665 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1666 } 1667 1668 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1669 FunctionDecl *getDirectCallee(); 1670 const FunctionDecl *getDirectCallee() const { 1671 return const_cast<CallExpr*>(this)->getDirectCallee(); 1672 } 1673 1674 /// getNumArgs - Return the number of actual arguments to this call. 1675 /// 1676 unsigned getNumArgs() const { return NumArgs; } 1677 1678 /// getArg - Return the specified argument. 1679 Expr *getArg(unsigned Arg) { 1680 assert(Arg < NumArgs && "Arg access out of range!"); 1681 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1682 } 1683 const Expr *getArg(unsigned Arg) const { 1684 assert(Arg < NumArgs && "Arg access out of range!"); 1685 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1686 } 1687 1688 /// setArg - Set the specified argument. 1689 void setArg(unsigned Arg, Expr *ArgExpr) { 1690 assert(Arg < NumArgs && "Arg access out of range!"); 1691 SubExprs[Arg+ARGS_START] = ArgExpr; 1692 } 1693 1694 /// setNumArgs - This changes the number of arguments present in this call. 1695 /// Any orphaned expressions are deleted by this, and any new operands are set 1696 /// to null. 1697 void setNumArgs(ASTContext& C, unsigned NumArgs); 1698 1699 typedef ExprIterator arg_iterator; 1700 typedef ConstExprIterator const_arg_iterator; 1701 1702 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1703 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1704 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1705 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1706 1707 /// getNumCommas - Return the number of commas that must have been present in 1708 /// this function call. 1709 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1710 1711 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1712 /// not, return 0. 1713 unsigned isBuiltinCall(ASTContext &Context) const; 1714 1715 /// getCallReturnType - Get the return type of the call expr. This is not 1716 /// always the type of the expr itself, if the return type is a reference 1717 /// type. 1718 QualType getCallReturnType() const; 1719 1720 SourceLocation getRParenLoc() const { return RParenLoc; } 1721 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1722 1723 virtual SourceRange getSourceRange() const { 1724 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1725 } 1726 1727 static bool classof(const Stmt *T) { 1728 return T->getStmtClass() >= firstCallExprConstant && 1729 T->getStmtClass() <= lastCallExprConstant; 1730 } 1731 static bool classof(const CallExpr *) { return true; } 1732 1733 // Iterators 1734 virtual child_iterator child_begin(); 1735 virtual child_iterator child_end(); 1736}; 1737 1738/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1739/// 1740class MemberExpr : public Expr { 1741 /// Extra data stored in some member expressions. 1742 struct MemberNameQualifier : public NameQualifier { 1743 DeclAccessPair FoundDecl; 1744 }; 1745 1746 /// Base - the expression for the base pointer or structure references. In 1747 /// X.F, this is "X". 1748 Stmt *Base; 1749 1750 /// MemberDecl - This is the decl being referenced by the field/member name. 1751 /// In X.F, this is the decl referenced by F. 1752 ValueDecl *MemberDecl; 1753 1754 /// MemberLoc - This is the location of the member name. 1755 SourceLocation MemberLoc; 1756 1757 /// MemberDNLoc - Provides source/type location info for the 1758 /// declaration name embedded in MemberDecl. 1759 DeclarationNameLoc MemberDNLoc; 1760 1761 /// IsArrow - True if this is "X->F", false if this is "X.F". 1762 bool IsArrow : 1; 1763 1764 /// \brief True if this member expression used a nested-name-specifier to 1765 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1766 /// declaration. When true, a MemberNameQualifier 1767 /// structure is allocated immediately after the MemberExpr. 1768 bool HasQualifierOrFoundDecl : 1; 1769 1770 /// \brief True if this member expression specified a template argument list 1771 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1772 /// structure (and its TemplateArguments) are allocated immediately after 1773 /// the MemberExpr or, if the member expression also has a qualifier, after 1774 /// the MemberNameQualifier structure. 1775 bool HasExplicitTemplateArgumentList : 1; 1776 1777 /// \brief Retrieve the qualifier that preceded the member name, if any. 1778 MemberNameQualifier *getMemberQualifier() { 1779 assert(HasQualifierOrFoundDecl); 1780 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1781 } 1782 1783 /// \brief Retrieve the qualifier that preceded the member name, if any. 1784 const MemberNameQualifier *getMemberQualifier() const { 1785 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1786 } 1787 1788public: 1789 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1790 const DeclarationNameInfo &NameInfo, QualType ty, 1791 ExprValueKind VK, ExprObjectKind OK) 1792 : Expr(MemberExprClass, ty, VK, OK, 1793 base->isTypeDependent(), base->isValueDependent()), 1794 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1795 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1796 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1797 assert(memberdecl->getDeclName() == NameInfo.getName()); 1798 } 1799 1800 // NOTE: this constructor should be used only when it is known that 1801 // the member name can not provide additional syntactic info 1802 // (i.e., source locations for C++ operator names or type source info 1803 // for constructors, destructors and conversion oeprators). 1804 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1805 SourceLocation l, QualType ty, 1806 ExprValueKind VK, ExprObjectKind OK) 1807 : Expr(MemberExprClass, ty, VK, OK, 1808 base->isTypeDependent(), base->isValueDependent()), 1809 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1810 IsArrow(isarrow), 1811 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1812 1813 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1814 NestedNameSpecifier *qual, SourceRange qualrange, 1815 ValueDecl *memberdecl, DeclAccessPair founddecl, 1816 DeclarationNameInfo MemberNameInfo, 1817 const TemplateArgumentListInfo *targs, 1818 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1819 1820 void setBase(Expr *E) { Base = E; } 1821 Expr *getBase() const { return cast<Expr>(Base); } 1822 1823 /// \brief Retrieve the member declaration to which this expression refers. 1824 /// 1825 /// The returned declaration will either be a FieldDecl or (in C++) 1826 /// a CXXMethodDecl. 1827 ValueDecl *getMemberDecl() const { return MemberDecl; } 1828 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1829 1830 /// \brief Retrieves the declaration found by lookup. 1831 DeclAccessPair getFoundDecl() const { 1832 if (!HasQualifierOrFoundDecl) 1833 return DeclAccessPair::make(getMemberDecl(), 1834 getMemberDecl()->getAccess()); 1835 return getMemberQualifier()->FoundDecl; 1836 } 1837 1838 /// \brief Determines whether this member expression actually had 1839 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1840 /// x->Base::foo. 1841 bool hasQualifier() const { return getQualifier() != 0; } 1842 1843 /// \brief If the member name was qualified, retrieves the source range of 1844 /// the nested-name-specifier that precedes the member name. Otherwise, 1845 /// returns an empty source range. 1846 SourceRange getQualifierRange() const { 1847 if (!HasQualifierOrFoundDecl) 1848 return SourceRange(); 1849 1850 return getMemberQualifier()->Range; 1851 } 1852 1853 /// \brief If the member name was qualified, retrieves the 1854 /// nested-name-specifier that precedes the member name. Otherwise, returns 1855 /// NULL. 1856 NestedNameSpecifier *getQualifier() const { 1857 if (!HasQualifierOrFoundDecl) 1858 return 0; 1859 1860 return getMemberQualifier()->NNS; 1861 } 1862 1863 /// \brief Determines whether this member expression actually had a C++ 1864 /// template argument list explicitly specified, e.g., x.f<int>. 1865 bool hasExplicitTemplateArgs() const { 1866 return HasExplicitTemplateArgumentList; 1867 } 1868 1869 /// \brief Copies the template arguments (if present) into the given 1870 /// structure. 1871 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1872 if (hasExplicitTemplateArgs()) 1873 getExplicitTemplateArgs().copyInto(List); 1874 } 1875 1876 /// \brief Retrieve the explicit template argument list that 1877 /// follow the member template name. This must only be called on an 1878 /// expression with explicit template arguments. 1879 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1880 assert(HasExplicitTemplateArgumentList); 1881 if (!HasQualifierOrFoundDecl) 1882 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1883 1884 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1885 getMemberQualifier() + 1); 1886 } 1887 1888 /// \brief Retrieve the explicit template argument list that 1889 /// followed the member template name. This must only be called on 1890 /// an expression with explicit template arguments. 1891 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1892 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1893 } 1894 1895 /// \brief Retrieves the optional explicit template arguments. 1896 /// This points to the same data as getExplicitTemplateArgs(), but 1897 /// returns null if there are no explicit template arguments. 1898 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1899 if (!hasExplicitTemplateArgs()) return 0; 1900 return &getExplicitTemplateArgs(); 1901 } 1902 1903 /// \brief Retrieve the location of the left angle bracket following the 1904 /// member name ('<'), if any. 1905 SourceLocation getLAngleLoc() const { 1906 if (!HasExplicitTemplateArgumentList) 1907 return SourceLocation(); 1908 1909 return getExplicitTemplateArgs().LAngleLoc; 1910 } 1911 1912 /// \brief Retrieve the template arguments provided as part of this 1913 /// template-id. 1914 const TemplateArgumentLoc *getTemplateArgs() const { 1915 if (!HasExplicitTemplateArgumentList) 1916 return 0; 1917 1918 return getExplicitTemplateArgs().getTemplateArgs(); 1919 } 1920 1921 /// \brief Retrieve the number of template arguments provided as part of this 1922 /// template-id. 1923 unsigned getNumTemplateArgs() const { 1924 if (!HasExplicitTemplateArgumentList) 1925 return 0; 1926 1927 return getExplicitTemplateArgs().NumTemplateArgs; 1928 } 1929 1930 /// \brief Retrieve the location of the right angle bracket following the 1931 /// template arguments ('>'). 1932 SourceLocation getRAngleLoc() const { 1933 if (!HasExplicitTemplateArgumentList) 1934 return SourceLocation(); 1935 1936 return getExplicitTemplateArgs().RAngleLoc; 1937 } 1938 1939 /// \brief Retrieve the member declaration name info. 1940 DeclarationNameInfo getMemberNameInfo() const { 1941 return DeclarationNameInfo(MemberDecl->getDeclName(), 1942 MemberLoc, MemberDNLoc); 1943 } 1944 1945 bool isArrow() const { return IsArrow; } 1946 void setArrow(bool A) { IsArrow = A; } 1947 1948 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1949 /// location of 'F'. 1950 SourceLocation getMemberLoc() const { return MemberLoc; } 1951 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1952 1953 virtual SourceRange getSourceRange() const { 1954 // If we have an implicit base (like a C++ implicit this), 1955 // make sure not to return its location 1956 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1957 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1958 1959 SourceLocation BaseLoc = getBase()->getLocStart(); 1960 if (BaseLoc.isInvalid()) 1961 return SourceRange(MemberLoc, EndLoc); 1962 return SourceRange(BaseLoc, EndLoc); 1963 } 1964 1965 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1966 1967 static bool classof(const Stmt *T) { 1968 return T->getStmtClass() == MemberExprClass; 1969 } 1970 static bool classof(const MemberExpr *) { return true; } 1971 1972 // Iterators 1973 virtual child_iterator child_begin(); 1974 virtual child_iterator child_end(); 1975 1976 friend class ASTReader; 1977 friend class ASTStmtWriter; 1978}; 1979 1980/// CompoundLiteralExpr - [C99 6.5.2.5] 1981/// 1982class CompoundLiteralExpr : public Expr { 1983 /// LParenLoc - If non-null, this is the location of the left paren in a 1984 /// compound literal like "(int){4}". This can be null if this is a 1985 /// synthesized compound expression. 1986 SourceLocation LParenLoc; 1987 1988 /// The type as written. This can be an incomplete array type, in 1989 /// which case the actual expression type will be different. 1990 TypeSourceInfo *TInfo; 1991 Stmt *Init; 1992 bool FileScope; 1993public: 1994 // FIXME: Can compound literals be value-dependent? 1995 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1996 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 1997 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 1998 tinfo->getType()->isDependentType(), false), 1999 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2000 2001 /// \brief Construct an empty compound literal. 2002 explicit CompoundLiteralExpr(EmptyShell Empty) 2003 : Expr(CompoundLiteralExprClass, Empty) { } 2004 2005 const Expr *getInitializer() const { return cast<Expr>(Init); } 2006 Expr *getInitializer() { return cast<Expr>(Init); } 2007 void setInitializer(Expr *E) { Init = E; } 2008 2009 bool isFileScope() const { return FileScope; } 2010 void setFileScope(bool FS) { FileScope = FS; } 2011 2012 SourceLocation getLParenLoc() const { return LParenLoc; } 2013 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2014 2015 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2016 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2017 2018 virtual SourceRange getSourceRange() const { 2019 // FIXME: Init should never be null. 2020 if (!Init) 2021 return SourceRange(); 2022 if (LParenLoc.isInvalid()) 2023 return Init->getSourceRange(); 2024 return SourceRange(LParenLoc, Init->getLocEnd()); 2025 } 2026 2027 static bool classof(const Stmt *T) { 2028 return T->getStmtClass() == CompoundLiteralExprClass; 2029 } 2030 static bool classof(const CompoundLiteralExpr *) { return true; } 2031 2032 // Iterators 2033 virtual child_iterator child_begin(); 2034 virtual child_iterator child_end(); 2035}; 2036 2037/// CastExpr - Base class for type casts, including both implicit 2038/// casts (ImplicitCastExpr) and explicit casts that have some 2039/// representation in the source code (ExplicitCastExpr's derived 2040/// classes). 2041class CastExpr : public Expr { 2042public: 2043 typedef clang::CastKind CastKind; 2044 2045private: 2046 Stmt *Op; 2047 2048 void CheckCastConsistency() const { 2049#ifndef NDEBUG 2050 switch (getCastKind()) { 2051 case CK_DerivedToBase: 2052 case CK_UncheckedDerivedToBase: 2053 case CK_DerivedToBaseMemberPointer: 2054 case CK_BaseToDerived: 2055 case CK_BaseToDerivedMemberPointer: 2056 assert(!path_empty() && "Cast kind should have a base path!"); 2057 break; 2058 2059 // These should not have an inheritance path. 2060 case CK_BitCast: 2061 case CK_Dynamic: 2062 case CK_ToUnion: 2063 case CK_ArrayToPointerDecay: 2064 case CK_FunctionToPointerDecay: 2065 case CK_NullToMemberPointer: 2066 case CK_NullToPointer: 2067 case CK_ConstructorConversion: 2068 case CK_IntegralToPointer: 2069 case CK_PointerToIntegral: 2070 case CK_ToVoid: 2071 case CK_VectorSplat: 2072 case CK_IntegralCast: 2073 case CK_IntegralToFloating: 2074 case CK_FloatingToIntegral: 2075 case CK_FloatingCast: 2076 case CK_AnyPointerToObjCPointerCast: 2077 case CK_AnyPointerToBlockPointerCast: 2078 case CK_ObjCObjectLValueCast: 2079 case CK_FloatingRealToComplex: 2080 case CK_FloatingComplexToReal: 2081 case CK_FloatingComplexCast: 2082 case CK_FloatingComplexToIntegralComplex: 2083 case CK_IntegralRealToComplex: 2084 case CK_IntegralComplexToReal: 2085 case CK_IntegralComplexCast: 2086 case CK_IntegralComplexToFloatingComplex: 2087 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2088 // fallthrough to check for null base path 2089 2090 case CK_Dependent: 2091 case CK_LValueToRValue: 2092 case CK_GetObjCProperty: 2093 case CK_NoOp: 2094 case CK_PointerToBoolean: 2095 case CK_IntegralToBoolean: 2096 case CK_FloatingToBoolean: 2097 case CK_MemberPointerToBoolean: 2098 case CK_FloatingComplexToBoolean: 2099 case CK_IntegralComplexToBoolean: 2100 case CK_LValueBitCast: // -> bool& 2101 case CK_UserDefinedConversion: // operator bool() 2102 assert(path_empty() && "Cast kind should not have a base path!"); 2103 break; 2104 } 2105#endif 2106 } 2107 2108 const CXXBaseSpecifier * const *path_buffer() const { 2109 return const_cast<CastExpr*>(this)->path_buffer(); 2110 } 2111 CXXBaseSpecifier **path_buffer(); 2112 2113protected: 2114 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2115 const CastKind kind, Expr *op, unsigned BasePathSize) : 2116 Expr(SC, ty, VK, OK_Ordinary, 2117 // Cast expressions are type-dependent if the type is 2118 // dependent (C++ [temp.dep.expr]p3). 2119 ty->isDependentType(), 2120 // Cast expressions are value-dependent if the type is 2121 // dependent or if the subexpression is value-dependent. 2122 ty->isDependentType() || (op && op->isValueDependent())), 2123 Op(op) { 2124 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2125 CastExprBits.Kind = kind; 2126 CastExprBits.BasePathSize = BasePathSize; 2127 CheckCastConsistency(); 2128 } 2129 2130 /// \brief Construct an empty cast. 2131 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2132 : Expr(SC, Empty) { 2133 CastExprBits.BasePathSize = BasePathSize; 2134 } 2135 2136public: 2137 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2138 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2139 const char *getCastKindName() const; 2140 2141 Expr *getSubExpr() { return cast<Expr>(Op); } 2142 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2143 void setSubExpr(Expr *E) { Op = E; } 2144 2145 /// \brief Retrieve the cast subexpression as it was written in the source 2146 /// code, looking through any implicit casts or other intermediate nodes 2147 /// introduced by semantic analysis. 2148 Expr *getSubExprAsWritten(); 2149 const Expr *getSubExprAsWritten() const { 2150 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2151 } 2152 2153 typedef CXXBaseSpecifier **path_iterator; 2154 typedef const CXXBaseSpecifier * const *path_const_iterator; 2155 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2156 unsigned path_size() const { return CastExprBits.BasePathSize; } 2157 path_iterator path_begin() { return path_buffer(); } 2158 path_iterator path_end() { return path_buffer() + path_size(); } 2159 path_const_iterator path_begin() const { return path_buffer(); } 2160 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2161 2162 void setCastPath(const CXXCastPath &Path); 2163 2164 static bool classof(const Stmt *T) { 2165 return T->getStmtClass() >= firstCastExprConstant && 2166 T->getStmtClass() <= lastCastExprConstant; 2167 } 2168 static bool classof(const CastExpr *) { return true; } 2169 2170 // Iterators 2171 virtual child_iterator child_begin(); 2172 virtual child_iterator child_end(); 2173}; 2174 2175/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2176/// conversions, which have no direct representation in the original 2177/// source code. For example: converting T[]->T*, void f()->void 2178/// (*f)(), float->double, short->int, etc. 2179/// 2180/// In C, implicit casts always produce rvalues. However, in C++, an 2181/// implicit cast whose result is being bound to a reference will be 2182/// an lvalue or xvalue. For example: 2183/// 2184/// @code 2185/// class Base { }; 2186/// class Derived : public Base { }; 2187/// Derived &&ref(); 2188/// void f(Derived d) { 2189/// Base& b = d; // initializer is an ImplicitCastExpr 2190/// // to an lvalue of type Base 2191/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2192/// // to an xvalue of type Base 2193/// } 2194/// @endcode 2195class ImplicitCastExpr : public CastExpr { 2196private: 2197 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2198 unsigned BasePathLength, ExprValueKind VK) 2199 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2200 } 2201 2202 /// \brief Construct an empty implicit cast. 2203 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2204 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2205 2206public: 2207 enum OnStack_t { OnStack }; 2208 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2209 ExprValueKind VK) 2210 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2211 } 2212 2213 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2214 CastKind Kind, Expr *Operand, 2215 const CXXCastPath *BasePath, 2216 ExprValueKind Cat); 2217 2218 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2219 2220 virtual SourceRange getSourceRange() const { 2221 return getSubExpr()->getSourceRange(); 2222 } 2223 2224 static bool classof(const Stmt *T) { 2225 return T->getStmtClass() == ImplicitCastExprClass; 2226 } 2227 static bool classof(const ImplicitCastExpr *) { return true; } 2228}; 2229 2230/// ExplicitCastExpr - An explicit cast written in the source 2231/// code. 2232/// 2233/// This class is effectively an abstract class, because it provides 2234/// the basic representation of an explicitly-written cast without 2235/// specifying which kind of cast (C cast, functional cast, static 2236/// cast, etc.) was written; specific derived classes represent the 2237/// particular style of cast and its location information. 2238/// 2239/// Unlike implicit casts, explicit cast nodes have two different 2240/// types: the type that was written into the source code, and the 2241/// actual type of the expression as determined by semantic 2242/// analysis. These types may differ slightly. For example, in C++ one 2243/// can cast to a reference type, which indicates that the resulting 2244/// expression will be an lvalue or xvalue. The reference type, however, 2245/// will not be used as the type of the expression. 2246class ExplicitCastExpr : public CastExpr { 2247 /// TInfo - Source type info for the (written) type 2248 /// this expression is casting to. 2249 TypeSourceInfo *TInfo; 2250 2251protected: 2252 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2253 CastKind kind, Expr *op, unsigned PathSize, 2254 TypeSourceInfo *writtenTy) 2255 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2256 2257 /// \brief Construct an empty explicit cast. 2258 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2259 : CastExpr(SC, Shell, PathSize) { } 2260 2261public: 2262 /// getTypeInfoAsWritten - Returns the type source info for the type 2263 /// that this expression is casting to. 2264 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2265 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2266 2267 /// getTypeAsWritten - Returns the type that this expression is 2268 /// casting to, as written in the source code. 2269 QualType getTypeAsWritten() const { return TInfo->getType(); } 2270 2271 static bool classof(const Stmt *T) { 2272 return T->getStmtClass() >= firstExplicitCastExprConstant && 2273 T->getStmtClass() <= lastExplicitCastExprConstant; 2274 } 2275 static bool classof(const ExplicitCastExpr *) { return true; } 2276}; 2277 2278/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2279/// cast in C++ (C++ [expr.cast]), which uses the syntax 2280/// (Type)expr. For example: @c (int)f. 2281class CStyleCastExpr : public ExplicitCastExpr { 2282 SourceLocation LPLoc; // the location of the left paren 2283 SourceLocation RPLoc; // the location of the right paren 2284 2285 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2286 unsigned PathSize, TypeSourceInfo *writtenTy, 2287 SourceLocation l, SourceLocation r) 2288 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2289 writtenTy), LPLoc(l), RPLoc(r) {} 2290 2291 /// \brief Construct an empty C-style explicit cast. 2292 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2293 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2294 2295public: 2296 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2297 ExprValueKind VK, CastKind K, 2298 Expr *Op, const CXXCastPath *BasePath, 2299 TypeSourceInfo *WrittenTy, SourceLocation L, 2300 SourceLocation R); 2301 2302 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2303 2304 SourceLocation getLParenLoc() const { return LPLoc; } 2305 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2306 2307 SourceLocation getRParenLoc() const { return RPLoc; } 2308 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2309 2310 virtual SourceRange getSourceRange() const { 2311 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2312 } 2313 static bool classof(const Stmt *T) { 2314 return T->getStmtClass() == CStyleCastExprClass; 2315 } 2316 static bool classof(const CStyleCastExpr *) { return true; } 2317}; 2318 2319/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2320/// 2321/// This expression node kind describes a builtin binary operation, 2322/// such as "x + y" for integer values "x" and "y". The operands will 2323/// already have been converted to appropriate types (e.g., by 2324/// performing promotions or conversions). 2325/// 2326/// In C++, where operators may be overloaded, a different kind of 2327/// expression node (CXXOperatorCallExpr) is used to express the 2328/// invocation of an overloaded operator with operator syntax. Within 2329/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2330/// used to store an expression "x + y" depends on the subexpressions 2331/// for x and y. If neither x or y is type-dependent, and the "+" 2332/// operator resolves to a built-in operation, BinaryOperator will be 2333/// used to express the computation (x and y may still be 2334/// value-dependent). If either x or y is type-dependent, or if the 2335/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2336/// be used to express the computation. 2337class BinaryOperator : public Expr { 2338public: 2339 typedef BinaryOperatorKind Opcode; 2340 2341private: 2342 unsigned Opc : 6; 2343 SourceLocation OpLoc; 2344 2345 enum { LHS, RHS, END_EXPR }; 2346 Stmt* SubExprs[END_EXPR]; 2347public: 2348 2349 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2350 ExprValueKind VK, ExprObjectKind OK, 2351 SourceLocation opLoc) 2352 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2353 lhs->isTypeDependent() || rhs->isTypeDependent(), 2354 lhs->isValueDependent() || rhs->isValueDependent()), 2355 Opc(opc), OpLoc(opLoc) { 2356 SubExprs[LHS] = lhs; 2357 SubExprs[RHS] = rhs; 2358 assert(!isCompoundAssignmentOp() && 2359 "Use ArithAssignBinaryOperator for compound assignments"); 2360 } 2361 2362 /// \brief Construct an empty binary operator. 2363 explicit BinaryOperator(EmptyShell Empty) 2364 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2365 2366 SourceLocation getOperatorLoc() const { return OpLoc; } 2367 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2368 2369 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2370 void setOpcode(Opcode O) { Opc = O; } 2371 2372 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2373 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2374 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2375 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2376 2377 virtual SourceRange getSourceRange() const { 2378 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2379 } 2380 2381 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2382 /// corresponds to, e.g. "<<=". 2383 static const char *getOpcodeStr(Opcode Op); 2384 2385 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2386 2387 /// \brief Retrieve the binary opcode that corresponds to the given 2388 /// overloaded operator. 2389 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2390 2391 /// \brief Retrieve the overloaded operator kind that corresponds to 2392 /// the given binary opcode. 2393 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2394 2395 /// predicates to categorize the respective opcodes. 2396 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2397 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2398 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2399 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2400 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2401 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2402 2403 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2404 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2405 2406 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2407 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2408 2409 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2410 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2411 2412 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2413 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2414 2415 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2416 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2417 2418 static bool isAssignmentOp(Opcode Opc) { 2419 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2420 } 2421 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2422 2423 static bool isCompoundAssignmentOp(Opcode Opc) { 2424 return Opc > BO_Assign && Opc <= BO_OrAssign; 2425 } 2426 bool isCompoundAssignmentOp() const { 2427 return isCompoundAssignmentOp(getOpcode()); 2428 } 2429 2430 static bool isShiftAssignOp(Opcode Opc) { 2431 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2432 } 2433 bool isShiftAssignOp() const { 2434 return isShiftAssignOp(getOpcode()); 2435 } 2436 2437 static bool classof(const Stmt *S) { 2438 return S->getStmtClass() >= firstBinaryOperatorConstant && 2439 S->getStmtClass() <= lastBinaryOperatorConstant; 2440 } 2441 static bool classof(const BinaryOperator *) { return true; } 2442 2443 // Iterators 2444 virtual child_iterator child_begin(); 2445 virtual child_iterator child_end(); 2446 2447protected: 2448 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2449 ExprValueKind VK, ExprObjectKind OK, 2450 SourceLocation opLoc, bool dead) 2451 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2452 lhs->isTypeDependent() || rhs->isTypeDependent(), 2453 lhs->isValueDependent() || rhs->isValueDependent()), 2454 Opc(opc), OpLoc(opLoc) { 2455 SubExprs[LHS] = lhs; 2456 SubExprs[RHS] = rhs; 2457 } 2458 2459 BinaryOperator(StmtClass SC, EmptyShell Empty) 2460 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2461}; 2462 2463/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2464/// track of the type the operation is performed in. Due to the semantics of 2465/// these operators, the operands are promoted, the aritmetic performed, an 2466/// implicit conversion back to the result type done, then the assignment takes 2467/// place. This captures the intermediate type which the computation is done 2468/// in. 2469class CompoundAssignOperator : public BinaryOperator { 2470 QualType ComputationLHSType; 2471 QualType ComputationResultType; 2472public: 2473 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2474 ExprValueKind VK, ExprObjectKind OK, 2475 QualType CompLHSType, QualType CompResultType, 2476 SourceLocation OpLoc) 2477 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2478 ComputationLHSType(CompLHSType), 2479 ComputationResultType(CompResultType) { 2480 assert(isCompoundAssignmentOp() && 2481 "Only should be used for compound assignments"); 2482 } 2483 2484 /// \brief Build an empty compound assignment operator expression. 2485 explicit CompoundAssignOperator(EmptyShell Empty) 2486 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2487 2488 // The two computation types are the type the LHS is converted 2489 // to for the computation and the type of the result; the two are 2490 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2491 QualType getComputationLHSType() const { return ComputationLHSType; } 2492 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2493 2494 QualType getComputationResultType() const { return ComputationResultType; } 2495 void setComputationResultType(QualType T) { ComputationResultType = T; } 2496 2497 static bool classof(const CompoundAssignOperator *) { return true; } 2498 static bool classof(const Stmt *S) { 2499 return S->getStmtClass() == CompoundAssignOperatorClass; 2500 } 2501}; 2502 2503/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2504/// GNU "missing LHS" extension is in use. 2505/// 2506class ConditionalOperator : public Expr { 2507 enum { COND, LHS, RHS, END_EXPR }; 2508 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2509 Stmt* Save; 2510 SourceLocation QuestionLoc, ColonLoc; 2511public: 2512 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2513 SourceLocation CLoc, Expr *rhs, Expr *save, 2514 QualType t, ExprValueKind VK, ExprObjectKind OK) 2515 : Expr(ConditionalOperatorClass, t, VK, OK, 2516 // FIXME: the type of the conditional operator doesn't 2517 // depend on the type of the conditional, but the standard 2518 // seems to imply that it could. File a bug! 2519 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2520 (cond->isValueDependent() || 2521 (lhs && lhs->isValueDependent()) || 2522 (rhs && rhs->isValueDependent()))), 2523 QuestionLoc(QLoc), 2524 ColonLoc(CLoc) { 2525 SubExprs[COND] = cond; 2526 SubExprs[LHS] = lhs; 2527 SubExprs[RHS] = rhs; 2528 Save = save; 2529 } 2530 2531 /// \brief Build an empty conditional operator. 2532 explicit ConditionalOperator(EmptyShell Empty) 2533 : Expr(ConditionalOperatorClass, Empty) { } 2534 2535 // getCond - Return the expression representing the condition for 2536 // the ?: operator. 2537 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2538 void setCond(Expr *E) { SubExprs[COND] = E; } 2539 2540 // getTrueExpr - Return the subexpression representing the value of the ?: 2541 // expression if the condition evaluates to true. 2542 Expr *getTrueExpr() const { 2543 return cast<Expr>(SubExprs[LHS]); 2544 } 2545 2546 // getFalseExpr - Return the subexpression representing the value of the ?: 2547 // expression if the condition evaluates to false. This is the same as getRHS. 2548 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2549 2550 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2551 // allows the left subexpression to be omitted, and instead of that condition 2552 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2553 // expression "x" is only evaluated once. Under this senario, this function 2554 // returns the original, non-converted condition expression for the ?:operator 2555 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2556 2557 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2558 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2559 2560 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2561 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2562 2563 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2564 void setSAVE(Expr *E) { Save = E; } 2565 2566 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2567 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2568 2569 SourceLocation getColonLoc() const { return ColonLoc; } 2570 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2571 2572 virtual SourceRange getSourceRange() const { 2573 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2574 } 2575 static bool classof(const Stmt *T) { 2576 return T->getStmtClass() == ConditionalOperatorClass; 2577 } 2578 static bool classof(const ConditionalOperator *) { return true; } 2579 2580 // Iterators 2581 virtual child_iterator child_begin(); 2582 virtual child_iterator child_end(); 2583}; 2584 2585/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2586class AddrLabelExpr : public Expr { 2587 SourceLocation AmpAmpLoc, LabelLoc; 2588 LabelStmt *Label; 2589public: 2590 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2591 QualType t) 2592 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false), 2593 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2594 2595 /// \brief Build an empty address of a label expression. 2596 explicit AddrLabelExpr(EmptyShell Empty) 2597 : Expr(AddrLabelExprClass, Empty) { } 2598 2599 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2600 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2601 SourceLocation getLabelLoc() const { return LabelLoc; } 2602 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2603 2604 virtual SourceRange getSourceRange() const { 2605 return SourceRange(AmpAmpLoc, LabelLoc); 2606 } 2607 2608 LabelStmt *getLabel() const { return Label; } 2609 void setLabel(LabelStmt *S) { Label = S; } 2610 2611 static bool classof(const Stmt *T) { 2612 return T->getStmtClass() == AddrLabelExprClass; 2613 } 2614 static bool classof(const AddrLabelExpr *) { return true; } 2615 2616 // Iterators 2617 virtual child_iterator child_begin(); 2618 virtual child_iterator child_end(); 2619}; 2620 2621/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2622/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2623/// takes the value of the last subexpression. 2624/// 2625/// A StmtExpr is always an r-value; values "returned" out of a 2626/// StmtExpr will be copied. 2627class StmtExpr : public Expr { 2628 Stmt *SubStmt; 2629 SourceLocation LParenLoc, RParenLoc; 2630public: 2631 // FIXME: Does type-dependence need to be computed differently? 2632 StmtExpr(CompoundStmt *substmt, QualType T, 2633 SourceLocation lp, SourceLocation rp) : 2634 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2635 T->isDependentType(), false), 2636 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2637 2638 /// \brief Build an empty statement expression. 2639 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2640 2641 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2642 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2643 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2644 2645 virtual SourceRange getSourceRange() const { 2646 return SourceRange(LParenLoc, RParenLoc); 2647 } 2648 2649 SourceLocation getLParenLoc() const { return LParenLoc; } 2650 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2651 SourceLocation getRParenLoc() const { return RParenLoc; } 2652 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2653 2654 static bool classof(const Stmt *T) { 2655 return T->getStmtClass() == StmtExprClass; 2656 } 2657 static bool classof(const StmtExpr *) { return true; } 2658 2659 // Iterators 2660 virtual child_iterator child_begin(); 2661 virtual child_iterator child_end(); 2662}; 2663 2664 2665/// ShuffleVectorExpr - clang-specific builtin-in function 2666/// __builtin_shufflevector. 2667/// This AST node represents a operator that does a constant 2668/// shuffle, similar to LLVM's shufflevector instruction. It takes 2669/// two vectors and a variable number of constant indices, 2670/// and returns the appropriately shuffled vector. 2671class ShuffleVectorExpr : public Expr { 2672 SourceLocation BuiltinLoc, RParenLoc; 2673 2674 // SubExprs - the list of values passed to the __builtin_shufflevector 2675 // function. The first two are vectors, and the rest are constant 2676 // indices. The number of values in this list is always 2677 // 2+the number of indices in the vector type. 2678 Stmt **SubExprs; 2679 unsigned NumExprs; 2680 2681public: 2682 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2683 // to be computed differently? 2684 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2685 QualType Type, SourceLocation BLoc, 2686 SourceLocation RP) : 2687 Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2688 Type->isDependentType(), false), 2689 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2690 2691 SubExprs = new (C) Stmt*[nexpr]; 2692 for (unsigned i = 0; i < nexpr; i++) 2693 SubExprs[i] = args[i]; 2694 } 2695 2696 /// \brief Build an empty vector-shuffle expression. 2697 explicit ShuffleVectorExpr(EmptyShell Empty) 2698 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2699 2700 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2701 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2702 2703 SourceLocation getRParenLoc() const { return RParenLoc; } 2704 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2705 2706 virtual SourceRange getSourceRange() const { 2707 return SourceRange(BuiltinLoc, RParenLoc); 2708 } 2709 static bool classof(const Stmt *T) { 2710 return T->getStmtClass() == ShuffleVectorExprClass; 2711 } 2712 static bool classof(const ShuffleVectorExpr *) { return true; } 2713 2714 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2715 /// constant expression, the actual arguments passed in, and the function 2716 /// pointers. 2717 unsigned getNumSubExprs() const { return NumExprs; } 2718 2719 /// getExpr - Return the Expr at the specified index. 2720 Expr *getExpr(unsigned Index) { 2721 assert((Index < NumExprs) && "Arg access out of range!"); 2722 return cast<Expr>(SubExprs[Index]); 2723 } 2724 const Expr *getExpr(unsigned Index) const { 2725 assert((Index < NumExprs) && "Arg access out of range!"); 2726 return cast<Expr>(SubExprs[Index]); 2727 } 2728 2729 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2730 2731 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2732 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2733 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2734 } 2735 2736 // Iterators 2737 virtual child_iterator child_begin(); 2738 virtual child_iterator child_end(); 2739}; 2740 2741/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2742/// This AST node is similar to the conditional operator (?:) in C, with 2743/// the following exceptions: 2744/// - the test expression must be a integer constant expression. 2745/// - the expression returned acts like the chosen subexpression in every 2746/// visible way: the type is the same as that of the chosen subexpression, 2747/// and all predicates (whether it's an l-value, whether it's an integer 2748/// constant expression, etc.) return the same result as for the chosen 2749/// sub-expression. 2750class ChooseExpr : public Expr { 2751 enum { COND, LHS, RHS, END_EXPR }; 2752 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2753 SourceLocation BuiltinLoc, RParenLoc; 2754public: 2755 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2756 QualType t, ExprValueKind VK, ExprObjectKind OK, 2757 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2758 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent), 2759 BuiltinLoc(BLoc), RParenLoc(RP) { 2760 SubExprs[COND] = cond; 2761 SubExprs[LHS] = lhs; 2762 SubExprs[RHS] = rhs; 2763 } 2764 2765 /// \brief Build an empty __builtin_choose_expr. 2766 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2767 2768 /// isConditionTrue - Return whether the condition is true (i.e. not 2769 /// equal to zero). 2770 bool isConditionTrue(ASTContext &C) const; 2771 2772 /// getChosenSubExpr - Return the subexpression chosen according to the 2773 /// condition. 2774 Expr *getChosenSubExpr(ASTContext &C) const { 2775 return isConditionTrue(C) ? getLHS() : getRHS(); 2776 } 2777 2778 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2779 void setCond(Expr *E) { SubExprs[COND] = E; } 2780 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2781 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2782 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2783 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2784 2785 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2786 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2787 2788 SourceLocation getRParenLoc() const { return RParenLoc; } 2789 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2790 2791 virtual SourceRange getSourceRange() const { 2792 return SourceRange(BuiltinLoc, RParenLoc); 2793 } 2794 static bool classof(const Stmt *T) { 2795 return T->getStmtClass() == ChooseExprClass; 2796 } 2797 static bool classof(const ChooseExpr *) { return true; } 2798 2799 // Iterators 2800 virtual child_iterator child_begin(); 2801 virtual child_iterator child_end(); 2802}; 2803 2804/// GNUNullExpr - Implements the GNU __null extension, which is a name 2805/// for a null pointer constant that has integral type (e.g., int or 2806/// long) and is the same size and alignment as a pointer. The __null 2807/// extension is typically only used by system headers, which define 2808/// NULL as __null in C++ rather than using 0 (which is an integer 2809/// that may not match the size of a pointer). 2810class GNUNullExpr : public Expr { 2811 /// TokenLoc - The location of the __null keyword. 2812 SourceLocation TokenLoc; 2813 2814public: 2815 GNUNullExpr(QualType Ty, SourceLocation Loc) 2816 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false), 2817 TokenLoc(Loc) { } 2818 2819 /// \brief Build an empty GNU __null expression. 2820 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2821 2822 /// getTokenLocation - The location of the __null token. 2823 SourceLocation getTokenLocation() const { return TokenLoc; } 2824 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2825 2826 virtual SourceRange getSourceRange() const { 2827 return SourceRange(TokenLoc); 2828 } 2829 static bool classof(const Stmt *T) { 2830 return T->getStmtClass() == GNUNullExprClass; 2831 } 2832 static bool classof(const GNUNullExpr *) { return true; } 2833 2834 // Iterators 2835 virtual child_iterator child_begin(); 2836 virtual child_iterator child_end(); 2837}; 2838 2839/// VAArgExpr, used for the builtin function __builtin_va_arg. 2840class VAArgExpr : public Expr { 2841 Stmt *Val; 2842 TypeSourceInfo *TInfo; 2843 SourceLocation BuiltinLoc, RParenLoc; 2844public: 2845 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2846 SourceLocation RPLoc, QualType t) 2847 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 2848 t->isDependentType(), false), 2849 Val(e), TInfo(TInfo), 2850 BuiltinLoc(BLoc), 2851 RParenLoc(RPLoc) { } 2852 2853 /// \brief Create an empty __builtin_va_arg expression. 2854 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2855 2856 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2857 Expr *getSubExpr() { return cast<Expr>(Val); } 2858 void setSubExpr(Expr *E) { Val = E; } 2859 2860 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2861 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2862 2863 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2864 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2865 2866 SourceLocation getRParenLoc() const { return RParenLoc; } 2867 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2868 2869 virtual SourceRange getSourceRange() const { 2870 return SourceRange(BuiltinLoc, RParenLoc); 2871 } 2872 static bool classof(const Stmt *T) { 2873 return T->getStmtClass() == VAArgExprClass; 2874 } 2875 static bool classof(const VAArgExpr *) { return true; } 2876 2877 // Iterators 2878 virtual child_iterator child_begin(); 2879 virtual child_iterator child_end(); 2880}; 2881 2882/// @brief Describes an C or C++ initializer list. 2883/// 2884/// InitListExpr describes an initializer list, which can be used to 2885/// initialize objects of different types, including 2886/// struct/class/union types, arrays, and vectors. For example: 2887/// 2888/// @code 2889/// struct foo x = { 1, { 2, 3 } }; 2890/// @endcode 2891/// 2892/// Prior to semantic analysis, an initializer list will represent the 2893/// initializer list as written by the user, but will have the 2894/// placeholder type "void". This initializer list is called the 2895/// syntactic form of the initializer, and may contain C99 designated 2896/// initializers (represented as DesignatedInitExprs), initializations 2897/// of subobject members without explicit braces, and so on. Clients 2898/// interested in the original syntax of the initializer list should 2899/// use the syntactic form of the initializer list. 2900/// 2901/// After semantic analysis, the initializer list will represent the 2902/// semantic form of the initializer, where the initializations of all 2903/// subobjects are made explicit with nested InitListExpr nodes and 2904/// C99 designators have been eliminated by placing the designated 2905/// initializations into the subobject they initialize. Additionally, 2906/// any "holes" in the initialization, where no initializer has been 2907/// specified for a particular subobject, will be replaced with 2908/// implicitly-generated ImplicitValueInitExpr expressions that 2909/// value-initialize the subobjects. Note, however, that the 2910/// initializer lists may still have fewer initializers than there are 2911/// elements to initialize within the object. 2912/// 2913/// Given the semantic form of the initializer list, one can retrieve 2914/// the original syntactic form of that initializer list (if it 2915/// exists) using getSyntacticForm(). Since many initializer lists 2916/// have the same syntactic and semantic forms, getSyntacticForm() may 2917/// return NULL, indicating that the current initializer list also 2918/// serves as its syntactic form. 2919class InitListExpr : public Expr { 2920 // FIXME: Eliminate this vector in favor of ASTContext allocation 2921 typedef ASTVector<Stmt *> InitExprsTy; 2922 InitExprsTy InitExprs; 2923 SourceLocation LBraceLoc, RBraceLoc; 2924 2925 /// Contains the initializer list that describes the syntactic form 2926 /// written in the source code. 2927 InitListExpr *SyntacticForm; 2928 2929 /// If this initializer list initializes a union, specifies which 2930 /// field within the union will be initialized. 2931 FieldDecl *UnionFieldInit; 2932 2933 /// Whether this initializer list originally had a GNU array-range 2934 /// designator in it. This is a temporary marker used by CodeGen. 2935 bool HadArrayRangeDesignator; 2936 2937public: 2938 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2939 Expr **initexprs, unsigned numinits, 2940 SourceLocation rbraceloc); 2941 2942 /// \brief Build an empty initializer list. 2943 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2944 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2945 2946 unsigned getNumInits() const { return InitExprs.size(); } 2947 2948 const Expr *getInit(unsigned Init) const { 2949 assert(Init < getNumInits() && "Initializer access out of range!"); 2950 return cast_or_null<Expr>(InitExprs[Init]); 2951 } 2952 2953 Expr *getInit(unsigned Init) { 2954 assert(Init < getNumInits() && "Initializer access out of range!"); 2955 return cast_or_null<Expr>(InitExprs[Init]); 2956 } 2957 2958 void setInit(unsigned Init, Expr *expr) { 2959 assert(Init < getNumInits() && "Initializer access out of range!"); 2960 InitExprs[Init] = expr; 2961 } 2962 2963 /// \brief Reserve space for some number of initializers. 2964 void reserveInits(ASTContext &C, unsigned NumInits); 2965 2966 /// @brief Specify the number of initializers 2967 /// 2968 /// If there are more than @p NumInits initializers, the remaining 2969 /// initializers will be destroyed. If there are fewer than @p 2970 /// NumInits initializers, NULL expressions will be added for the 2971 /// unknown initializers. 2972 void resizeInits(ASTContext &Context, unsigned NumInits); 2973 2974 /// @brief Updates the initializer at index @p Init with the new 2975 /// expression @p expr, and returns the old expression at that 2976 /// location. 2977 /// 2978 /// When @p Init is out of range for this initializer list, the 2979 /// initializer list will be extended with NULL expressions to 2980 /// accomodate the new entry. 2981 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2982 2983 /// \brief If this initializes a union, specifies which field in the 2984 /// union to initialize. 2985 /// 2986 /// Typically, this field is the first named field within the 2987 /// union. However, a designated initializer can specify the 2988 /// initialization of a different field within the union. 2989 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2990 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2991 2992 // Explicit InitListExpr's originate from source code (and have valid source 2993 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2994 bool isExplicit() { 2995 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2996 } 2997 2998 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2999 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3000 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3001 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3002 3003 /// @brief Retrieve the initializer list that describes the 3004 /// syntactic form of the initializer. 3005 /// 3006 /// 3007 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3008 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3009 3010 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3011 void sawArrayRangeDesignator(bool ARD = true) { 3012 HadArrayRangeDesignator = ARD; 3013 } 3014 3015 virtual SourceRange getSourceRange() const; 3016 3017 static bool classof(const Stmt *T) { 3018 return T->getStmtClass() == InitListExprClass; 3019 } 3020 static bool classof(const InitListExpr *) { return true; } 3021 3022 // Iterators 3023 virtual child_iterator child_begin(); 3024 virtual child_iterator child_end(); 3025 3026 typedef InitExprsTy::iterator iterator; 3027 typedef InitExprsTy::const_iterator const_iterator; 3028 typedef InitExprsTy::reverse_iterator reverse_iterator; 3029 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3030 3031 iterator begin() { return InitExprs.begin(); } 3032 const_iterator begin() const { return InitExprs.begin(); } 3033 iterator end() { return InitExprs.end(); } 3034 const_iterator end() const { return InitExprs.end(); } 3035 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3036 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3037 reverse_iterator rend() { return InitExprs.rend(); } 3038 const_reverse_iterator rend() const { return InitExprs.rend(); } 3039}; 3040 3041/// @brief Represents a C99 designated initializer expression. 3042/// 3043/// A designated initializer expression (C99 6.7.8) contains one or 3044/// more designators (which can be field designators, array 3045/// designators, or GNU array-range designators) followed by an 3046/// expression that initializes the field or element(s) that the 3047/// designators refer to. For example, given: 3048/// 3049/// @code 3050/// struct point { 3051/// double x; 3052/// double y; 3053/// }; 3054/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3055/// @endcode 3056/// 3057/// The InitListExpr contains three DesignatedInitExprs, the first of 3058/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3059/// designators, one array designator for @c [2] followed by one field 3060/// designator for @c .y. The initalization expression will be 1.0. 3061class DesignatedInitExpr : public Expr { 3062public: 3063 /// \brief Forward declaration of the Designator class. 3064 class Designator; 3065 3066private: 3067 /// The location of the '=' or ':' prior to the actual initializer 3068 /// expression. 3069 SourceLocation EqualOrColonLoc; 3070 3071 /// Whether this designated initializer used the GNU deprecated 3072 /// syntax rather than the C99 '=' syntax. 3073 bool GNUSyntax : 1; 3074 3075 /// The number of designators in this initializer expression. 3076 unsigned NumDesignators : 15; 3077 3078 /// \brief The designators in this designated initialization 3079 /// expression. 3080 Designator *Designators; 3081 3082 /// The number of subexpressions of this initializer expression, 3083 /// which contains both the initializer and any additional 3084 /// expressions used by array and array-range designators. 3085 unsigned NumSubExprs : 16; 3086 3087 3088 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3089 const Designator *Designators, 3090 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3091 Expr **IndexExprs, unsigned NumIndexExprs, 3092 Expr *Init); 3093 3094 explicit DesignatedInitExpr(unsigned NumSubExprs) 3095 : Expr(DesignatedInitExprClass, EmptyShell()), 3096 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3097 3098public: 3099 /// A field designator, e.g., ".x". 3100 struct FieldDesignator { 3101 /// Refers to the field that is being initialized. The low bit 3102 /// of this field determines whether this is actually a pointer 3103 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3104 /// initially constructed, a field designator will store an 3105 /// IdentifierInfo*. After semantic analysis has resolved that 3106 /// name, the field designator will instead store a FieldDecl*. 3107 uintptr_t NameOrField; 3108 3109 /// The location of the '.' in the designated initializer. 3110 unsigned DotLoc; 3111 3112 /// The location of the field name in the designated initializer. 3113 unsigned FieldLoc; 3114 }; 3115 3116 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3117 struct ArrayOrRangeDesignator { 3118 /// Location of the first index expression within the designated 3119 /// initializer expression's list of subexpressions. 3120 unsigned Index; 3121 /// The location of the '[' starting the array range designator. 3122 unsigned LBracketLoc; 3123 /// The location of the ellipsis separating the start and end 3124 /// indices. Only valid for GNU array-range designators. 3125 unsigned EllipsisLoc; 3126 /// The location of the ']' terminating the array range designator. 3127 unsigned RBracketLoc; 3128 }; 3129 3130 /// @brief Represents a single C99 designator. 3131 /// 3132 /// @todo This class is infuriatingly similar to clang::Designator, 3133 /// but minor differences (storing indices vs. storing pointers) 3134 /// keep us from reusing it. Try harder, later, to rectify these 3135 /// differences. 3136 class Designator { 3137 /// @brief The kind of designator this describes. 3138 enum { 3139 FieldDesignator, 3140 ArrayDesignator, 3141 ArrayRangeDesignator 3142 } Kind; 3143 3144 union { 3145 /// A field designator, e.g., ".x". 3146 struct FieldDesignator Field; 3147 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3148 struct ArrayOrRangeDesignator ArrayOrRange; 3149 }; 3150 friend class DesignatedInitExpr; 3151 3152 public: 3153 Designator() {} 3154 3155 /// @brief Initializes a field designator. 3156 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3157 SourceLocation FieldLoc) 3158 : Kind(FieldDesignator) { 3159 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3160 Field.DotLoc = DotLoc.getRawEncoding(); 3161 Field.FieldLoc = FieldLoc.getRawEncoding(); 3162 } 3163 3164 /// @brief Initializes an array designator. 3165 Designator(unsigned Index, SourceLocation LBracketLoc, 3166 SourceLocation RBracketLoc) 3167 : Kind(ArrayDesignator) { 3168 ArrayOrRange.Index = Index; 3169 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3170 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3171 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3172 } 3173 3174 /// @brief Initializes a GNU array-range designator. 3175 Designator(unsigned Index, SourceLocation LBracketLoc, 3176 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3177 : Kind(ArrayRangeDesignator) { 3178 ArrayOrRange.Index = Index; 3179 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3180 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3181 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3182 } 3183 3184 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3185 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3186 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3187 3188 IdentifierInfo * getFieldName(); 3189 3190 FieldDecl *getField() { 3191 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3192 if (Field.NameOrField & 0x01) 3193 return 0; 3194 else 3195 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3196 } 3197 3198 void setField(FieldDecl *FD) { 3199 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3200 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3201 } 3202 3203 SourceLocation getDotLoc() const { 3204 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3205 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3206 } 3207 3208 SourceLocation getFieldLoc() const { 3209 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3210 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3211 } 3212 3213 SourceLocation getLBracketLoc() const { 3214 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3215 "Only valid on an array or array-range designator"); 3216 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3217 } 3218 3219 SourceLocation getRBracketLoc() const { 3220 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3221 "Only valid on an array or array-range designator"); 3222 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3223 } 3224 3225 SourceLocation getEllipsisLoc() const { 3226 assert(Kind == ArrayRangeDesignator && 3227 "Only valid on an array-range designator"); 3228 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3229 } 3230 3231 unsigned getFirstExprIndex() const { 3232 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3233 "Only valid on an array or array-range designator"); 3234 return ArrayOrRange.Index; 3235 } 3236 3237 SourceLocation getStartLocation() const { 3238 if (Kind == FieldDesignator) 3239 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3240 else 3241 return getLBracketLoc(); 3242 } 3243 }; 3244 3245 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3246 unsigned NumDesignators, 3247 Expr **IndexExprs, unsigned NumIndexExprs, 3248 SourceLocation EqualOrColonLoc, 3249 bool GNUSyntax, Expr *Init); 3250 3251 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3252 3253 /// @brief Returns the number of designators in this initializer. 3254 unsigned size() const { return NumDesignators; } 3255 3256 // Iterator access to the designators. 3257 typedef Designator* designators_iterator; 3258 designators_iterator designators_begin() { return Designators; } 3259 designators_iterator designators_end() { 3260 return Designators + NumDesignators; 3261 } 3262 3263 typedef std::reverse_iterator<designators_iterator> 3264 reverse_designators_iterator; 3265 reverse_designators_iterator designators_rbegin() { 3266 return reverse_designators_iterator(designators_end()); 3267 } 3268 reverse_designators_iterator designators_rend() { 3269 return reverse_designators_iterator(designators_begin()); 3270 } 3271 3272 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3273 3274 void setDesignators(ASTContext &C, const Designator *Desigs, 3275 unsigned NumDesigs); 3276 3277 Expr *getArrayIndex(const Designator& D); 3278 Expr *getArrayRangeStart(const Designator& D); 3279 Expr *getArrayRangeEnd(const Designator& D); 3280 3281 /// @brief Retrieve the location of the '=' that precedes the 3282 /// initializer value itself, if present. 3283 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3284 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3285 3286 /// @brief Determines whether this designated initializer used the 3287 /// deprecated GNU syntax for designated initializers. 3288 bool usesGNUSyntax() const { return GNUSyntax; } 3289 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3290 3291 /// @brief Retrieve the initializer value. 3292 Expr *getInit() const { 3293 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3294 } 3295 3296 void setInit(Expr *init) { 3297 *child_begin() = init; 3298 } 3299 3300 /// \brief Retrieve the total number of subexpressions in this 3301 /// designated initializer expression, including the actual 3302 /// initialized value and any expressions that occur within array 3303 /// and array-range designators. 3304 unsigned getNumSubExprs() const { return NumSubExprs; } 3305 3306 Expr *getSubExpr(unsigned Idx) { 3307 assert(Idx < NumSubExprs && "Subscript out of range"); 3308 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3309 Ptr += sizeof(DesignatedInitExpr); 3310 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3311 } 3312 3313 void setSubExpr(unsigned Idx, Expr *E) { 3314 assert(Idx < NumSubExprs && "Subscript out of range"); 3315 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3316 Ptr += sizeof(DesignatedInitExpr); 3317 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3318 } 3319 3320 /// \brief Replaces the designator at index @p Idx with the series 3321 /// of designators in [First, Last). 3322 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3323 const Designator *Last); 3324 3325 virtual SourceRange getSourceRange() const; 3326 3327 static bool classof(const Stmt *T) { 3328 return T->getStmtClass() == DesignatedInitExprClass; 3329 } 3330 static bool classof(const DesignatedInitExpr *) { return true; } 3331 3332 // Iterators 3333 virtual child_iterator child_begin(); 3334 virtual child_iterator child_end(); 3335}; 3336 3337/// \brief Represents an implicitly-generated value initialization of 3338/// an object of a given type. 3339/// 3340/// Implicit value initializations occur within semantic initializer 3341/// list expressions (InitListExpr) as placeholders for subobject 3342/// initializations not explicitly specified by the user. 3343/// 3344/// \see InitListExpr 3345class ImplicitValueInitExpr : public Expr { 3346public: 3347 explicit ImplicitValueInitExpr(QualType ty) 3348 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3349 false, false) { } 3350 3351 /// \brief Construct an empty implicit value initialization. 3352 explicit ImplicitValueInitExpr(EmptyShell Empty) 3353 : Expr(ImplicitValueInitExprClass, Empty) { } 3354 3355 static bool classof(const Stmt *T) { 3356 return T->getStmtClass() == ImplicitValueInitExprClass; 3357 } 3358 static bool classof(const ImplicitValueInitExpr *) { return true; } 3359 3360 virtual SourceRange getSourceRange() const { 3361 return SourceRange(); 3362 } 3363 3364 // Iterators 3365 virtual child_iterator child_begin(); 3366 virtual child_iterator child_end(); 3367}; 3368 3369 3370class ParenListExpr : public Expr { 3371 Stmt **Exprs; 3372 unsigned NumExprs; 3373 SourceLocation LParenLoc, RParenLoc; 3374 3375public: 3376 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3377 unsigned numexprs, SourceLocation rparenloc); 3378 3379 /// \brief Build an empty paren list. 3380 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3381 3382 unsigned getNumExprs() const { return NumExprs; } 3383 3384 const Expr* getExpr(unsigned Init) const { 3385 assert(Init < getNumExprs() && "Initializer access out of range!"); 3386 return cast_or_null<Expr>(Exprs[Init]); 3387 } 3388 3389 Expr* getExpr(unsigned Init) { 3390 assert(Init < getNumExprs() && "Initializer access out of range!"); 3391 return cast_or_null<Expr>(Exprs[Init]); 3392 } 3393 3394 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3395 3396 SourceLocation getLParenLoc() const { return LParenLoc; } 3397 SourceLocation getRParenLoc() const { return RParenLoc; } 3398 3399 virtual SourceRange getSourceRange() const { 3400 return SourceRange(LParenLoc, RParenLoc); 3401 } 3402 static bool classof(const Stmt *T) { 3403 return T->getStmtClass() == ParenListExprClass; 3404 } 3405 static bool classof(const ParenListExpr *) { return true; } 3406 3407 // Iterators 3408 virtual child_iterator child_begin(); 3409 virtual child_iterator child_end(); 3410 3411 friend class ASTStmtReader; 3412 friend class ASTStmtWriter; 3413}; 3414 3415 3416//===----------------------------------------------------------------------===// 3417// Clang Extensions 3418//===----------------------------------------------------------------------===// 3419 3420 3421/// ExtVectorElementExpr - This represents access to specific elements of a 3422/// vector, and may occur on the left hand side or right hand side. For example 3423/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3424/// 3425/// Note that the base may have either vector or pointer to vector type, just 3426/// like a struct field reference. 3427/// 3428class ExtVectorElementExpr : public Expr { 3429 Stmt *Base; 3430 IdentifierInfo *Accessor; 3431 SourceLocation AccessorLoc; 3432public: 3433 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3434 IdentifierInfo &accessor, SourceLocation loc) 3435 : Expr(ExtVectorElementExprClass, ty, VK, 3436 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3437 base->isTypeDependent(), base->isValueDependent()), 3438 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3439 3440 /// \brief Build an empty vector element expression. 3441 explicit ExtVectorElementExpr(EmptyShell Empty) 3442 : Expr(ExtVectorElementExprClass, Empty) { } 3443 3444 const Expr *getBase() const { return cast<Expr>(Base); } 3445 Expr *getBase() { return cast<Expr>(Base); } 3446 void setBase(Expr *E) { Base = E; } 3447 3448 IdentifierInfo &getAccessor() const { return *Accessor; } 3449 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3450 3451 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3452 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3453 3454 /// getNumElements - Get the number of components being selected. 3455 unsigned getNumElements() const; 3456 3457 /// containsDuplicateElements - Return true if any element access is 3458 /// repeated. 3459 bool containsDuplicateElements() const; 3460 3461 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3462 /// aggregate Constant of ConstantInt(s). 3463 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3464 3465 virtual SourceRange getSourceRange() const { 3466 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3467 } 3468 3469 /// isArrow - Return true if the base expression is a pointer to vector, 3470 /// return false if the base expression is a vector. 3471 bool isArrow() const; 3472 3473 static bool classof(const Stmt *T) { 3474 return T->getStmtClass() == ExtVectorElementExprClass; 3475 } 3476 static bool classof(const ExtVectorElementExpr *) { return true; } 3477 3478 // Iterators 3479 virtual child_iterator child_begin(); 3480 virtual child_iterator child_end(); 3481}; 3482 3483 3484/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3485/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3486class BlockExpr : public Expr { 3487protected: 3488 BlockDecl *TheBlock; 3489 bool HasBlockDeclRefExprs; 3490public: 3491 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3492 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3493 ty->isDependentType(), false), 3494 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3495 3496 /// \brief Build an empty block expression. 3497 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3498 3499 const BlockDecl *getBlockDecl() const { return TheBlock; } 3500 BlockDecl *getBlockDecl() { return TheBlock; } 3501 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3502 3503 // Convenience functions for probing the underlying BlockDecl. 3504 SourceLocation getCaretLocation() const; 3505 const Stmt *getBody() const; 3506 Stmt *getBody(); 3507 3508 virtual SourceRange getSourceRange() const { 3509 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3510 } 3511 3512 /// getFunctionType - Return the underlying function type for this block. 3513 const FunctionType *getFunctionType() const; 3514 3515 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3516 /// inside of the block that reference values outside the block. 3517 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3518 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3519 3520 static bool classof(const Stmt *T) { 3521 return T->getStmtClass() == BlockExprClass; 3522 } 3523 static bool classof(const BlockExpr *) { return true; } 3524 3525 // Iterators 3526 virtual child_iterator child_begin(); 3527 virtual child_iterator child_end(); 3528}; 3529 3530/// BlockDeclRefExpr - A reference to a declared variable, function, 3531/// enum, etc. 3532class BlockDeclRefExpr : public Expr { 3533 ValueDecl *D; 3534 SourceLocation Loc; 3535 bool IsByRef : 1; 3536 bool ConstQualAdded : 1; 3537 Stmt *CopyConstructorVal; 3538public: 3539 // FIXME: Fix type/value dependence! 3540 BlockDeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, 3541 SourceLocation l, bool ByRef, bool constAdded = false, 3542 Stmt *copyConstructorVal = 0) 3543 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, 3544 (!t.isNull() && t->isDependentType()), false), 3545 D(d), Loc(l), IsByRef(ByRef), 3546 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3547 3548 // \brief Build an empty reference to a declared variable in a 3549 // block. 3550 explicit BlockDeclRefExpr(EmptyShell Empty) 3551 : Expr(BlockDeclRefExprClass, Empty) { } 3552 3553 ValueDecl *getDecl() { return D; } 3554 const ValueDecl *getDecl() const { return D; } 3555 void setDecl(ValueDecl *VD) { D = VD; } 3556 3557 SourceLocation getLocation() const { return Loc; } 3558 void setLocation(SourceLocation L) { Loc = L; } 3559 3560 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3561 3562 bool isByRef() const { return IsByRef; } 3563 void setByRef(bool BR) { IsByRef = BR; } 3564 3565 bool isConstQualAdded() const { return ConstQualAdded; } 3566 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3567 3568 const Expr *getCopyConstructorExpr() const 3569 { return cast_or_null<Expr>(CopyConstructorVal); } 3570 Expr *getCopyConstructorExpr() 3571 { return cast_or_null<Expr>(CopyConstructorVal); } 3572 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3573 3574 static bool classof(const Stmt *T) { 3575 return T->getStmtClass() == BlockDeclRefExprClass; 3576 } 3577 static bool classof(const BlockDeclRefExpr *) { return true; } 3578 3579 // Iterators 3580 virtual child_iterator child_begin(); 3581 virtual child_iterator child_end(); 3582}; 3583 3584/// OpaqueValueExpr - An expression referring to an opaque object of a 3585/// fixed type and value class. These don't correspond to concrete 3586/// syntax; instead they're used to express operations (usually copy 3587/// operations) on values whose source is generally obvious from 3588/// context. 3589class OpaqueValueExpr : public Expr { 3590 friend class ASTStmtReader; 3591public: 3592 OpaqueValueExpr(QualType T, ExprValueKind VK, ExprObjectKind OK = OK_Ordinary) 3593 : Expr(OpaqueValueExprClass, T, VK, OK, 3594 T->isDependentType(), T->isDependentType()) { 3595 } 3596 3597 explicit OpaqueValueExpr(EmptyShell Empty) 3598 : Expr(OpaqueValueExprClass, Empty) { } 3599 3600 virtual SourceRange getSourceRange() const; 3601 virtual child_iterator child_begin(); 3602 virtual child_iterator child_end(); 3603 3604 static bool classof(const Stmt *T) { 3605 return T->getStmtClass() == OpaqueValueExprClass; 3606 } 3607 static bool classof(const OpaqueValueExpr *) { return true; } 3608}; 3609 3610} // end namespace clang 3611 3612#endif 3613