Expr.h revision 6b5a61b6dc400027fd793dcadceeb9da944a37ea
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 <cctype> 29#include <vector> 30 31namespace clang { 32 class ASTContext; 33 class APValue; 34 class Decl; 35 class IdentifierInfo; 36 class ParmVarDecl; 37 class NamedDecl; 38 class ValueDecl; 39 class BlockDecl; 40 class CXXBaseSpecifier; 41 class CXXOperatorCallExpr; 42 class CXXMemberCallExpr; 43 class ObjCPropertyRefExpr; 44 class TemplateArgumentLoc; 45 class TemplateArgumentListInfo; 46 47/// \brief A simple array of base specifiers. 48typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57 virtual void ANCHOR(); // key function. 58 59protected: 60 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 61 bool TD, bool VD, bool ContainsUnexpandedParameterPack) : Stmt(SC) { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.ValueKind = VK; 65 ExprBits.ObjectKind = OK; 66 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 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 /// \brief Set the bit that describes whether this expression 136 /// contains an unexpanded parameter pack. 137 void setContainsUnexpandedParameterPack(bool PP = true) { 138 ExprBits.ContainsUnexpandedParameterPack = PP; 139 } 140 141 /// SourceLocation tokens are not useful in isolation - they are low level 142 /// value objects created/interpreted by SourceManager. We assume AST 143 /// clients will have a pointer to the respective SourceManager. 144 virtual SourceRange getSourceRange() const = 0; 145 146 /// getExprLoc - Return the preferred location for the arrow when diagnosing 147 /// a problem with a generic expression. 148 virtual SourceLocation getExprLoc() const { return getLocStart(); } 149 150 /// isUnusedResultAWarning - Return true if this immediate expression should 151 /// be warned about if the result is unused. If so, fill in Loc and Ranges 152 /// with location to warn on and the source range[s] to report with the 153 /// warning. 154 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 155 SourceRange &R2, ASTContext &Ctx) const; 156 157 /// isLValue - True if this expression is an "l-value" according to 158 /// the rules of the current language. C and C++ give somewhat 159 /// different rules for this concept, but in general, the result of 160 /// an l-value expression identifies a specific object whereas the 161 /// result of an r-value expression is a value detached from any 162 /// specific storage. 163 /// 164 /// C++0x divides the concept of "r-value" into pure r-values 165 /// ("pr-values") and so-called expiring values ("x-values"), which 166 /// identify specific objects that can be safely cannibalized for 167 /// their resources. This is an unfortunate abuse of terminology on 168 /// the part of the C++ committee. In Clang, when we say "r-value", 169 /// we generally mean a pr-value. 170 bool isLValue() const { return getValueKind() == VK_LValue; } 171 bool isRValue() const { return getValueKind() == VK_RValue; } 172 bool isXValue() const { return getValueKind() == VK_XValue; } 173 bool isGLValue() const { return getValueKind() != VK_RValue; } 174 175 enum LValueClassification { 176 LV_Valid, 177 LV_NotObjectType, 178 LV_IncompleteVoidType, 179 LV_DuplicateVectorComponents, 180 LV_InvalidExpression, 181 LV_MemberFunction, 182 LV_SubObjCPropertySetting, 183 LV_ClassTemporary 184 }; 185 /// Reasons why an expression might not be an l-value. 186 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 187 188 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 189 /// does not have an incomplete type, does not have a const-qualified type, 190 /// and if it is a structure or union, does not have any member (including, 191 /// recursively, any member or element of all contained aggregates or unions) 192 /// with a const-qualified type. 193 /// 194 /// \param Loc [in] [out] - A source location which *may* be filled 195 /// in with the location of the expression making this a 196 /// non-modifiable lvalue, if specified. 197 enum isModifiableLvalueResult { 198 MLV_Valid, 199 MLV_NotObjectType, 200 MLV_IncompleteVoidType, 201 MLV_DuplicateVectorComponents, 202 MLV_InvalidExpression, 203 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 204 MLV_IncompleteType, 205 MLV_ConstQualified, 206 MLV_ArrayType, 207 MLV_NotBlockQualified, 208 MLV_ReadonlyProperty, 209 MLV_NoSetterProperty, 210 MLV_MemberFunction, 211 MLV_SubObjCPropertySetting, 212 MLV_ClassTemporary 213 }; 214 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 215 SourceLocation *Loc = 0) const; 216 217 /// \brief The return type of classify(). Represents the C++0x expression 218 /// taxonomy. 219 class Classification { 220 public: 221 /// \brief The various classification results. Most of these mean prvalue. 222 enum Kinds { 223 CL_LValue, 224 CL_XValue, 225 CL_Function, // Functions cannot be lvalues in C. 226 CL_Void, // Void cannot be an lvalue in C. 227 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 228 CL_MemberFunction, // An expression referring to a member function 229 CL_SubObjCPropertySetting, 230 CL_ClassTemporary, // A prvalue of class type 231 CL_PRValue // A prvalue for any other reason, of any other type 232 }; 233 /// \brief The results of modification testing. 234 enum ModifiableType { 235 CM_Untested, // testModifiable was false. 236 CM_Modifiable, 237 CM_RValue, // Not modifiable because it's an rvalue 238 CM_Function, // Not modifiable because it's a function; C++ only 239 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 240 CM_NotBlockQualified, // Not captured in the closure 241 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 242 CM_ConstQualified, 243 CM_ArrayType, 244 CM_IncompleteType 245 }; 246 247 private: 248 friend class Expr; 249 250 unsigned short Kind; 251 unsigned short Modifiable; 252 253 explicit Classification(Kinds k, ModifiableType m) 254 : Kind(k), Modifiable(m) 255 {} 256 257 public: 258 Classification() {} 259 260 Kinds getKind() const { return static_cast<Kinds>(Kind); } 261 ModifiableType getModifiable() const { 262 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 263 return static_cast<ModifiableType>(Modifiable); 264 } 265 bool isLValue() const { return Kind == CL_LValue; } 266 bool isXValue() const { return Kind == CL_XValue; } 267 bool isGLValue() const { return Kind <= CL_XValue; } 268 bool isPRValue() const { return Kind >= CL_Function; } 269 bool isRValue() const { return Kind >= CL_XValue; } 270 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 271 272 /// \brief Create a simple, modifiably lvalue 273 static Classification makeSimpleLValue() { 274 return Classification(CL_LValue, CM_Modifiable); 275 } 276 277 }; 278 /// \brief Classify - Classify this expression according to the C++0x 279 /// expression taxonomy. 280 /// 281 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 282 /// old lvalue vs rvalue. This function determines the type of expression this 283 /// is. There are three expression types: 284 /// - lvalues are classical lvalues as in C++03. 285 /// - prvalues are equivalent to rvalues in C++03. 286 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 287 /// function returning an rvalue reference. 288 /// lvalues and xvalues are collectively referred to as glvalues, while 289 /// prvalues and xvalues together form rvalues. 290 Classification Classify(ASTContext &Ctx) const { 291 return ClassifyImpl(Ctx, 0); 292 } 293 294 /// \brief ClassifyModifiable - Classify this expression according to the 295 /// C++0x expression taxonomy, and see if it is valid on the left side 296 /// of an assignment. 297 /// 298 /// This function extends classify in that it also tests whether the 299 /// expression is modifiable (C99 6.3.2.1p1). 300 /// \param Loc A source location that might be filled with a relevant location 301 /// if the expression is not modifiable. 302 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 303 return ClassifyImpl(Ctx, &Loc); 304 } 305 306 /// getValueKindForType - Given a formal return or parameter type, 307 /// give its value kind. 308 static ExprValueKind getValueKindForType(QualType T) { 309 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 310 return (isa<LValueReferenceType>(RT) 311 ? VK_LValue 312 : (RT->getPointeeType()->isFunctionType() 313 ? VK_LValue : VK_XValue)); 314 return VK_RValue; 315 } 316 317 /// getValueKind - The value kind that this expression produces. 318 ExprValueKind getValueKind() const { 319 return static_cast<ExprValueKind>(ExprBits.ValueKind); 320 } 321 322 /// getObjectKind - The object kind that this expression produces. 323 /// Object kinds are meaningful only for expressions that yield an 324 /// l-value or x-value. 325 ExprObjectKind getObjectKind() const { 326 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 327 } 328 329 /// setValueKind - Set the value kind produced by this expression. 330 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 331 332 /// setObjectKind - Set the object kind produced by this expression. 333 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 334 335private: 336 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 337 338public: 339 340 /// \brief If this expression refers to a bit-field, retrieve the 341 /// declaration of that bit-field. 342 FieldDecl *getBitField(); 343 344 const FieldDecl *getBitField() const { 345 return const_cast<Expr*>(this)->getBitField(); 346 } 347 348 /// \brief If this expression is an l-value for an Objective C 349 /// property, find the underlying property reference expression. 350 const ObjCPropertyRefExpr *getObjCProperty() const; 351 352 /// \brief Returns whether this expression refers to a vector element. 353 bool refersToVectorElement() const; 354 355 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 356 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 357 /// but also int expressions which are produced by things like comparisons in 358 /// C. 359 bool isKnownToHaveBooleanValue() const; 360 361 /// isIntegerConstantExpr - Return true if this expression is a valid integer 362 /// constant expression, and, if so, return its value in Result. If not a 363 /// valid i-c-e, return false and fill in Loc (if specified) with the location 364 /// of the invalid expression. 365 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 366 SourceLocation *Loc = 0, 367 bool isEvaluated = true) const; 368 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 369 llvm::APSInt X; 370 return isIntegerConstantExpr(X, Ctx, Loc); 371 } 372 /// isConstantInitializer - Returns true if this expression is a constant 373 /// initializer, which can be emitted at compile-time. 374 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 375 376 /// EvalResult is a struct with detailed info about an evaluated expression. 377 struct EvalResult { 378 /// Val - This is the value the expression can be folded to. 379 APValue Val; 380 381 /// HasSideEffects - Whether the evaluated expression has side effects. 382 /// For example, (f() && 0) can be folded, but it still has side effects. 383 bool HasSideEffects; 384 385 /// Diag - If the expression is unfoldable, then Diag contains a note 386 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 387 /// position for the error, and DiagExpr is the expression that caused 388 /// the error. 389 /// If the expression is foldable, but not an integer constant expression, 390 /// Diag contains a note diagnostic that describes why it isn't an integer 391 /// constant expression. If the expression *is* an integer constant 392 /// expression, then Diag will be zero. 393 unsigned Diag; 394 const Expr *DiagExpr; 395 SourceLocation DiagLoc; 396 397 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 398 399 // isGlobalLValue - Return true if the evaluated lvalue expression 400 // is global. 401 bool isGlobalLValue() const; 402 // hasSideEffects - Return true if the evaluated expression has 403 // side effects. 404 bool hasSideEffects() const { 405 return HasSideEffects; 406 } 407 }; 408 409 /// Evaluate - Return true if this is a constant which we can fold using 410 /// any crazy technique (that has nothing to do with language standards) that 411 /// we want to. If this function returns true, it returns the folded constant 412 /// in Result. 413 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 414 415 /// EvaluateAsBooleanCondition - Return true if this is a constant 416 /// which we we can fold and convert to a boolean condition using 417 /// any crazy technique that we want to. 418 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 419 420 /// isEvaluatable - Call Evaluate to see if this expression can be constant 421 /// folded, but discard the result. 422 bool isEvaluatable(const ASTContext &Ctx) const; 423 424 /// HasSideEffects - This routine returns true for all those expressions 425 /// which must be evaluated each time and must not be optimized away 426 /// or evaluated at compile time. Example is a function call, volatile 427 /// variable read. 428 bool HasSideEffects(const ASTContext &Ctx) const; 429 430 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 431 /// must be called on an expression that constant folds to an integer. 432 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 433 434 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 435 /// with link time known address. 436 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 437 438 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 439 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 440 441 /// \brief Enumeration used to describe how \c isNullPointerConstant() 442 /// should cope with value-dependent expressions. 443 enum NullPointerConstantValueDependence { 444 /// \brief Specifies that the expression should never be value-dependent. 445 NPC_NeverValueDependent = 0, 446 447 /// \brief Specifies that a value-dependent expression of integral or 448 /// dependent type should be considered a null pointer constant. 449 NPC_ValueDependentIsNull, 450 451 /// \brief Specifies that a value-dependent expression should be considered 452 /// to never be a null pointer constant. 453 NPC_ValueDependentIsNotNull 454 }; 455 456 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 457 /// integer constant expression with the value zero, or if this is one that is 458 /// cast to void*. 459 bool isNullPointerConstant(ASTContext &Ctx, 460 NullPointerConstantValueDependence NPC) const; 461 462 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 463 /// write barrier. 464 bool isOBJCGCCandidate(ASTContext &Ctx) const; 465 466 /// \brief Returns true if this expression is a bound member function. 467 bool isBoundMemberFunction(ASTContext &Ctx) const; 468 469 /// \brief Result type of CanThrow(). 470 enum CanThrowResult { 471 CT_Cannot, 472 CT_Dependent, 473 CT_Can 474 }; 475 /// \brief Test if this expression, if evaluated, might throw, according to 476 /// the rules of C++ [expr.unary.noexcept]. 477 CanThrowResult CanThrow(ASTContext &C) const; 478 479 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 480 /// its subexpression. If that subexpression is also a ParenExpr, 481 /// then this method recursively returns its subexpression, and so forth. 482 /// Otherwise, the method returns the current Expr. 483 Expr *IgnoreParens(); 484 485 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 486 /// or CastExprs, returning their operand. 487 Expr *IgnoreParenCasts(); 488 489 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 490 /// ParenExpr or ImplicitCastExprs, returning their operand. 491 Expr *IgnoreParenImpCasts(); 492 493 const Expr *IgnoreParenImpCasts() const { 494 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 495 } 496 497 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 498 /// CastExprs that represent lvalue casts, returning their operand. 499 Expr *IgnoreParenLValueCasts(); 500 501 const Expr *IgnoreParenLValueCasts() const { 502 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 503 } 504 505 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 506 /// value (including ptr->int casts of the same size). Strip off any 507 /// ParenExpr or CastExprs, returning their operand. 508 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 509 510 /// \brief Determine whether this expression is a default function argument. 511 /// 512 /// Default arguments are implicitly generated in the abstract syntax tree 513 /// by semantic analysis for function calls, object constructions, etc. in 514 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 515 /// this routine also looks through any implicit casts to determine whether 516 /// the expression is a default argument. 517 bool isDefaultArgument() const; 518 519 /// \brief Determine whether the result of this expression is a 520 /// temporary object of the given class type. 521 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 522 523 const Expr *IgnoreParens() const { 524 return const_cast<Expr*>(this)->IgnoreParens(); 525 } 526 const Expr *IgnoreParenCasts() const { 527 return const_cast<Expr*>(this)->IgnoreParenCasts(); 528 } 529 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 530 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 531 } 532 533 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 534 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 535 536 static bool classof(const Stmt *T) { 537 return T->getStmtClass() >= firstExprConstant && 538 T->getStmtClass() <= lastExprConstant; 539 } 540 static bool classof(const Expr *) { return true; } 541}; 542 543 544//===----------------------------------------------------------------------===// 545// Primary Expressions. 546//===----------------------------------------------------------------------===// 547 548/// \brief Represents the qualifier that may precede a C++ name, e.g., the 549/// "std::" in "std::sort". 550struct NameQualifier { 551 /// \brief The nested name specifier. 552 NestedNameSpecifier *NNS; 553 554 /// \brief The source range covered by the nested name specifier. 555 SourceRange Range; 556}; 557 558/// \brief Represents an explicit template argument list in C++, e.g., 559/// the "<int>" in "sort<int>". 560struct ExplicitTemplateArgumentList { 561 /// \brief The source location of the left angle bracket ('<'); 562 SourceLocation LAngleLoc; 563 564 /// \brief The source location of the right angle bracket ('>'); 565 SourceLocation RAngleLoc; 566 567 /// \brief The number of template arguments in TemplateArgs. 568 /// The actual template arguments (if any) are stored after the 569 /// ExplicitTemplateArgumentList structure. 570 unsigned NumTemplateArgs; 571 572 /// \brief Retrieve the template arguments 573 TemplateArgumentLoc *getTemplateArgs() { 574 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 575 } 576 577 /// \brief Retrieve the template arguments 578 const TemplateArgumentLoc *getTemplateArgs() const { 579 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 580 } 581 582 void initializeFrom(const TemplateArgumentListInfo &List); 583 void initializeFrom(const TemplateArgumentListInfo &List, 584 bool &Dependent, bool &ContainsUnexpandedParameterPack); 585 void copyInto(TemplateArgumentListInfo &List) const; 586 static std::size_t sizeFor(unsigned NumTemplateArgs); 587 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 588}; 589 590/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 591/// enum, etc. 592class DeclRefExpr : public Expr { 593 enum { 594 // Flag on DecoratedD that specifies when this declaration reference 595 // expression has a C++ nested-name-specifier. 596 HasQualifierFlag = 0x01, 597 // Flag on DecoratedD that specifies when this declaration reference 598 // expression has an explicit C++ template argument list. 599 HasExplicitTemplateArgumentListFlag = 0x02 600 }; 601 602 // DecoratedD - The declaration that we are referencing, plus two bits to 603 // indicate whether (1) the declaration's name was explicitly qualified and 604 // (2) the declaration's name was followed by an explicit template 605 // argument list. 606 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 607 608 // Loc - The location of the declaration name itself. 609 SourceLocation Loc; 610 611 /// DNLoc - Provides source/type location info for the 612 /// declaration name embedded in DecoratedD. 613 DeclarationNameLoc DNLoc; 614 615 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 616 NameQualifier *getNameQualifier() { 617 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 618 return 0; 619 620 return reinterpret_cast<NameQualifier *> (this + 1); 621 } 622 623 /// \brief Retrieve the qualifier that preceded the member name, if any. 624 const NameQualifier *getNameQualifier() const { 625 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 626 } 627 628 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 629 ValueDecl *D, SourceLocation NameLoc, 630 const TemplateArgumentListInfo *TemplateArgs, 631 QualType T, ExprValueKind VK); 632 633 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 634 ValueDecl *D, const DeclarationNameInfo &NameInfo, 635 const TemplateArgumentListInfo *TemplateArgs, 636 QualType T, ExprValueKind VK); 637 638 /// \brief Construct an empty declaration reference expression. 639 explicit DeclRefExpr(EmptyShell Empty) 640 : Expr(DeclRefExprClass, Empty) { } 641 642 /// \brief Computes the type- and value-dependence flags for this 643 /// declaration reference expression. 644 void computeDependence(); 645 646public: 647 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 648 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 649 DecoratedD(d, 0), Loc(l) { 650 computeDependence(); 651 } 652 653 static DeclRefExpr *Create(ASTContext &Context, 654 NestedNameSpecifier *Qualifier, 655 SourceRange QualifierRange, 656 ValueDecl *D, 657 SourceLocation NameLoc, 658 QualType T, ExprValueKind VK, 659 const TemplateArgumentListInfo *TemplateArgs = 0); 660 661 static DeclRefExpr *Create(ASTContext &Context, 662 NestedNameSpecifier *Qualifier, 663 SourceRange QualifierRange, 664 ValueDecl *D, 665 const DeclarationNameInfo &NameInfo, 666 QualType T, ExprValueKind VK, 667 const TemplateArgumentListInfo *TemplateArgs = 0); 668 669 /// \brief Construct an empty declaration reference expression. 670 static DeclRefExpr *CreateEmpty(ASTContext &Context, 671 bool HasQualifier, 672 bool HasExplicitTemplateArgs, 673 unsigned NumTemplateArgs); 674 675 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 676 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 677 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 678 679 DeclarationNameInfo getNameInfo() const { 680 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 681 } 682 683 SourceLocation getLocation() const { return Loc; } 684 void setLocation(SourceLocation L) { Loc = L; } 685 virtual SourceRange getSourceRange() const; 686 687 /// \brief Determine whether this declaration reference was preceded by a 688 /// C++ nested-name-specifier, e.g., \c N::foo. 689 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 690 691 /// \brief If the name was qualified, retrieves the source range of 692 /// the nested-name-specifier that precedes the name. Otherwise, 693 /// returns an empty source range. 694 SourceRange getQualifierRange() const { 695 if (!hasQualifier()) 696 return SourceRange(); 697 698 return getNameQualifier()->Range; 699 } 700 701 /// \brief If the name was qualified, retrieves the nested-name-specifier 702 /// that precedes the name. Otherwise, returns NULL. 703 NestedNameSpecifier *getQualifier() const { 704 if (!hasQualifier()) 705 return 0; 706 707 return getNameQualifier()->NNS; 708 } 709 710 bool hasExplicitTemplateArgs() const { 711 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 712 } 713 714 /// \brief Retrieve the explicit template argument list that followed the 715 /// member template name. 716 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 717 assert(hasExplicitTemplateArgs()); 718 719 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 720 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 721 722 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 723 getNameQualifier() + 1); 724 } 725 726 /// \brief Retrieve the explicit template argument list that followed the 727 /// member template name. 728 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 729 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 730 } 731 732 /// \brief Retrieves the optional explicit template arguments. 733 /// This points to the same data as getExplicitTemplateArgs(), but 734 /// returns null if there are no explicit template arguments. 735 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 736 if (!hasExplicitTemplateArgs()) return 0; 737 return &getExplicitTemplateArgs(); 738 } 739 740 /// \brief Copies the template arguments (if present) into the given 741 /// structure. 742 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 743 if (hasExplicitTemplateArgs()) 744 getExplicitTemplateArgs().copyInto(List); 745 } 746 747 /// \brief Retrieve the location of the left angle bracket following the 748 /// member name ('<'), if any. 749 SourceLocation getLAngleLoc() const { 750 if (!hasExplicitTemplateArgs()) 751 return SourceLocation(); 752 753 return getExplicitTemplateArgs().LAngleLoc; 754 } 755 756 /// \brief Retrieve the template arguments provided as part of this 757 /// template-id. 758 const TemplateArgumentLoc *getTemplateArgs() const { 759 if (!hasExplicitTemplateArgs()) 760 return 0; 761 762 return getExplicitTemplateArgs().getTemplateArgs(); 763 } 764 765 /// \brief Retrieve the number of template arguments provided as part of this 766 /// template-id. 767 unsigned getNumTemplateArgs() const { 768 if (!hasExplicitTemplateArgs()) 769 return 0; 770 771 return getExplicitTemplateArgs().NumTemplateArgs; 772 } 773 774 /// \brief Retrieve the location of the right angle bracket following the 775 /// template arguments ('>'). 776 SourceLocation getRAngleLoc() const { 777 if (!hasExplicitTemplateArgs()) 778 return SourceLocation(); 779 780 return getExplicitTemplateArgs().RAngleLoc; 781 } 782 783 static bool classof(const Stmt *T) { 784 return T->getStmtClass() == DeclRefExprClass; 785 } 786 static bool classof(const DeclRefExpr *) { return true; } 787 788 // Iterators 789 virtual child_iterator child_begin(); 790 virtual child_iterator child_end(); 791 792 friend class ASTStmtReader; 793 friend class ASTStmtWriter; 794}; 795 796/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 797class PredefinedExpr : public Expr { 798public: 799 enum IdentType { 800 Func, 801 Function, 802 PrettyFunction, 803 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 804 /// 'virtual' keyword is omitted for virtual member functions. 805 PrettyFunctionNoVirtual 806 }; 807 808private: 809 SourceLocation Loc; 810 IdentType Type; 811public: 812 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 813 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 814 type->isDependentType(), type->isDependentType(), 815 /*ContainsUnexpandedParameterPack=*/false), 816 Loc(l), Type(IT) {} 817 818 /// \brief Construct an empty predefined expression. 819 explicit PredefinedExpr(EmptyShell Empty) 820 : Expr(PredefinedExprClass, Empty) { } 821 822 IdentType getIdentType() const { return Type; } 823 void setIdentType(IdentType IT) { Type = IT; } 824 825 SourceLocation getLocation() const { return Loc; } 826 void setLocation(SourceLocation L) { Loc = L; } 827 828 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 829 830 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 831 832 static bool classof(const Stmt *T) { 833 return T->getStmtClass() == PredefinedExprClass; 834 } 835 static bool classof(const PredefinedExpr *) { return true; } 836 837 // Iterators 838 virtual child_iterator child_begin(); 839 virtual child_iterator child_end(); 840}; 841 842/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 843/// leaking memory. 844/// 845/// For large floats/integers, APFloat/APInt will allocate memory from the heap 846/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 847/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 848/// the APFloat/APInt values will never get freed. APNumericStorage uses 849/// ASTContext's allocator for memory allocation. 850class APNumericStorage { 851 unsigned BitWidth; 852 union { 853 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 854 uint64_t *pVal; ///< Used to store the >64 bits integer value. 855 }; 856 857 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 858 859 APNumericStorage(const APNumericStorage&); // do not implement 860 APNumericStorage& operator=(const APNumericStorage&); // do not implement 861 862protected: 863 APNumericStorage() : BitWidth(0), VAL(0) { } 864 865 llvm::APInt getIntValue() const { 866 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 867 if (NumWords > 1) 868 return llvm::APInt(BitWidth, NumWords, pVal); 869 else 870 return llvm::APInt(BitWidth, VAL); 871 } 872 void setIntValue(ASTContext &C, const llvm::APInt &Val); 873}; 874 875class APIntStorage : public APNumericStorage { 876public: 877 llvm::APInt getValue() const { return getIntValue(); } 878 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 879}; 880 881class APFloatStorage : public APNumericStorage { 882public: 883 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 884 void setValue(ASTContext &C, const llvm::APFloat &Val) { 885 setIntValue(C, Val.bitcastToAPInt()); 886 } 887}; 888 889class IntegerLiteral : public Expr { 890 APIntStorage Num; 891 SourceLocation Loc; 892 893 /// \brief Construct an empty integer literal. 894 explicit IntegerLiteral(EmptyShell Empty) 895 : Expr(IntegerLiteralClass, Empty) { } 896 897public: 898 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 899 // or UnsignedLongLongTy 900 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 901 QualType type, SourceLocation l) 902 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 903 false), 904 Loc(l) { 905 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 906 setValue(C, V); 907 } 908 909 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 910 // or UnsignedLongLongTy 911 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 912 QualType type, SourceLocation l); 913 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 914 915 llvm::APInt getValue() const { return Num.getValue(); } 916 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 917 918 /// \brief Retrieve the location of the literal. 919 SourceLocation getLocation() const { return Loc; } 920 921 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 922 void setLocation(SourceLocation Location) { Loc = Location; } 923 924 static bool classof(const Stmt *T) { 925 return T->getStmtClass() == IntegerLiteralClass; 926 } 927 static bool classof(const IntegerLiteral *) { return true; } 928 929 // Iterators 930 virtual child_iterator child_begin(); 931 virtual child_iterator child_end(); 932}; 933 934class CharacterLiteral : public Expr { 935 unsigned Value; 936 SourceLocation Loc; 937 bool IsWide; 938public: 939 // type should be IntTy 940 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 941 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 942 false), 943 Value(value), Loc(l), IsWide(iswide) { 944 } 945 946 /// \brief Construct an empty character literal. 947 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 948 949 SourceLocation getLocation() const { return Loc; } 950 bool isWide() const { return IsWide; } 951 952 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 953 954 unsigned getValue() const { return Value; } 955 956 void setLocation(SourceLocation Location) { Loc = Location; } 957 void setWide(bool W) { IsWide = W; } 958 void setValue(unsigned Val) { Value = Val; } 959 960 static bool classof(const Stmt *T) { 961 return T->getStmtClass() == CharacterLiteralClass; 962 } 963 static bool classof(const CharacterLiteral *) { return true; } 964 965 // Iterators 966 virtual child_iterator child_begin(); 967 virtual child_iterator child_end(); 968}; 969 970class FloatingLiteral : public Expr { 971 APFloatStorage Num; 972 bool IsExact : 1; 973 SourceLocation Loc; 974 975 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 976 QualType Type, SourceLocation L) 977 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 978 false), 979 IsExact(isexact), Loc(L) { 980 setValue(C, V); 981 } 982 983 /// \brief Construct an empty floating-point literal. 984 explicit FloatingLiteral(EmptyShell Empty) 985 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 986 987public: 988 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 989 bool isexact, QualType Type, SourceLocation L); 990 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 991 992 llvm::APFloat getValue() const { return Num.getValue(); } 993 void setValue(ASTContext &C, const llvm::APFloat &Val) { 994 Num.setValue(C, Val); 995 } 996 997 bool isExact() const { return IsExact; } 998 void setExact(bool E) { IsExact = E; } 999 1000 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1001 /// double. Note that this may cause loss of precision, but is useful for 1002 /// debugging dumps, etc. 1003 double getValueAsApproximateDouble() const; 1004 1005 SourceLocation getLocation() const { return Loc; } 1006 void setLocation(SourceLocation L) { Loc = L; } 1007 1008 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 1009 1010 static bool classof(const Stmt *T) { 1011 return T->getStmtClass() == FloatingLiteralClass; 1012 } 1013 static bool classof(const FloatingLiteral *) { return true; } 1014 1015 // Iterators 1016 virtual child_iterator child_begin(); 1017 virtual child_iterator child_end(); 1018}; 1019 1020/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1021/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1022/// IntegerLiteral classes. Instances of this class always have a Complex type 1023/// whose element type matches the subexpression. 1024/// 1025class ImaginaryLiteral : public Expr { 1026 Stmt *Val; 1027public: 1028 ImaginaryLiteral(Expr *val, QualType Ty) 1029 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1030 false), 1031 Val(val) {} 1032 1033 /// \brief Build an empty imaginary literal. 1034 explicit ImaginaryLiteral(EmptyShell Empty) 1035 : Expr(ImaginaryLiteralClass, Empty) { } 1036 1037 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1038 Expr *getSubExpr() { return cast<Expr>(Val); } 1039 void setSubExpr(Expr *E) { Val = E; } 1040 1041 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 1042 static bool classof(const Stmt *T) { 1043 return T->getStmtClass() == ImaginaryLiteralClass; 1044 } 1045 static bool classof(const ImaginaryLiteral *) { return true; } 1046 1047 // Iterators 1048 virtual child_iterator child_begin(); 1049 virtual child_iterator child_end(); 1050}; 1051 1052/// StringLiteral - This represents a string literal expression, e.g. "foo" 1053/// or L"bar" (wide strings). The actual string is returned by getStrData() 1054/// is NOT null-terminated, and the length of the string is determined by 1055/// calling getByteLength(). The C type for a string is always a 1056/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1057/// not. 1058/// 1059/// Note that strings in C can be formed by concatenation of multiple string 1060/// literal pptokens in translation phase #6. This keeps track of the locations 1061/// of each of these pieces. 1062/// 1063/// Strings in C can also be truncated and extended by assigning into arrays, 1064/// e.g. with constructs like: 1065/// char X[2] = "foobar"; 1066/// In this case, getByteLength() will return 6, but the string literal will 1067/// have type "char[2]". 1068class StringLiteral : public Expr { 1069 const char *StrData; 1070 unsigned ByteLength; 1071 bool IsWide; 1072 unsigned NumConcatenated; 1073 SourceLocation TokLocs[1]; 1074 1075 StringLiteral(QualType Ty) : 1076 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1077 1078public: 1079 /// This is the "fully general" constructor that allows representation of 1080 /// strings formed from multiple concatenated tokens. 1081 static StringLiteral *Create(ASTContext &C, const char *StrData, 1082 unsigned ByteLength, bool Wide, QualType Ty, 1083 const SourceLocation *Loc, unsigned NumStrs); 1084 1085 /// Simple constructor for string literals made from one token. 1086 static StringLiteral *Create(ASTContext &C, const char *StrData, 1087 unsigned ByteLength, 1088 bool Wide, QualType Ty, SourceLocation Loc) { 1089 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1090 } 1091 1092 /// \brief Construct an empty string literal. 1093 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1094 1095 llvm::StringRef getString() const { 1096 return llvm::StringRef(StrData, ByteLength); 1097 } 1098 1099 unsigned getByteLength() const { return ByteLength; } 1100 1101 /// \brief Sets the string data to the given string data. 1102 void setString(ASTContext &C, llvm::StringRef Str); 1103 1104 bool isWide() const { return IsWide; } 1105 void setWide(bool W) { IsWide = W; } 1106 1107 bool containsNonAsciiOrNull() const { 1108 llvm::StringRef Str = getString(); 1109 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1110 if (!isascii(Str[i]) || !Str[i]) 1111 return true; 1112 return false; 1113 } 1114 /// getNumConcatenated - Get the number of string literal tokens that were 1115 /// concatenated in translation phase #6 to form this string literal. 1116 unsigned getNumConcatenated() const { return NumConcatenated; } 1117 1118 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1119 assert(TokNum < NumConcatenated && "Invalid tok number"); 1120 return TokLocs[TokNum]; 1121 } 1122 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1123 assert(TokNum < NumConcatenated && "Invalid tok number"); 1124 TokLocs[TokNum] = L; 1125 } 1126 1127 /// getLocationOfByte - Return a source location that points to the specified 1128 /// byte of this string literal. 1129 /// 1130 /// Strings are amazingly complex. They can be formed from multiple tokens 1131 /// and can have escape sequences in them in addition to the usual trigraph 1132 /// and escaped newline business. This routine handles this complexity. 1133 /// 1134 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1135 const LangOptions &Features, 1136 const TargetInfo &Target) const; 1137 1138 typedef const SourceLocation *tokloc_iterator; 1139 tokloc_iterator tokloc_begin() const { return TokLocs; } 1140 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1141 1142 virtual SourceRange getSourceRange() const { 1143 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1144 } 1145 static bool classof(const Stmt *T) { 1146 return T->getStmtClass() == StringLiteralClass; 1147 } 1148 static bool classof(const StringLiteral *) { return true; } 1149 1150 // Iterators 1151 virtual child_iterator child_begin(); 1152 virtual child_iterator child_end(); 1153}; 1154 1155/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1156/// AST node is only formed if full location information is requested. 1157class ParenExpr : public Expr { 1158 SourceLocation L, R; 1159 Stmt *Val; 1160public: 1161 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1162 : Expr(ParenExprClass, val->getType(), 1163 val->getValueKind(), val->getObjectKind(), 1164 val->isTypeDependent(), val->isValueDependent(), 1165 val->containsUnexpandedParameterPack()), 1166 L(l), R(r), Val(val) {} 1167 1168 /// \brief Construct an empty parenthesized expression. 1169 explicit ParenExpr(EmptyShell Empty) 1170 : Expr(ParenExprClass, Empty) { } 1171 1172 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1173 Expr *getSubExpr() { return cast<Expr>(Val); } 1174 void setSubExpr(Expr *E) { Val = E; } 1175 1176 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1177 1178 /// \brief Get the location of the left parentheses '('. 1179 SourceLocation getLParen() const { return L; } 1180 void setLParen(SourceLocation Loc) { L = Loc; } 1181 1182 /// \brief Get the location of the right parentheses ')'. 1183 SourceLocation getRParen() const { return R; } 1184 void setRParen(SourceLocation Loc) { R = Loc; } 1185 1186 static bool classof(const Stmt *T) { 1187 return T->getStmtClass() == ParenExprClass; 1188 } 1189 static bool classof(const ParenExpr *) { return true; } 1190 1191 // Iterators 1192 virtual child_iterator child_begin(); 1193 virtual child_iterator child_end(); 1194}; 1195 1196 1197/// UnaryOperator - This represents the unary-expression's (except sizeof and 1198/// alignof), the postinc/postdec operators from postfix-expression, and various 1199/// extensions. 1200/// 1201/// Notes on various nodes: 1202/// 1203/// Real/Imag - These return the real/imag part of a complex operand. If 1204/// applied to a non-complex value, the former returns its operand and the 1205/// later returns zero in the type of the operand. 1206/// 1207class UnaryOperator : public Expr { 1208public: 1209 typedef UnaryOperatorKind Opcode; 1210 1211private: 1212 unsigned Opc : 5; 1213 SourceLocation Loc; 1214 Stmt *Val; 1215public: 1216 1217 UnaryOperator(Expr *input, Opcode opc, QualType type, 1218 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1219 : Expr(UnaryOperatorClass, type, VK, OK, 1220 input->isTypeDependent() || type->isDependentType(), 1221 input->isValueDependent(), 1222 input->containsUnexpandedParameterPack()), 1223 Opc(opc), Loc(l), Val(input) {} 1224 1225 /// \brief Build an empty unary operator. 1226 explicit UnaryOperator(EmptyShell Empty) 1227 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1228 1229 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1230 void setOpcode(Opcode O) { Opc = O; } 1231 1232 Expr *getSubExpr() const { return cast<Expr>(Val); } 1233 void setSubExpr(Expr *E) { Val = E; } 1234 1235 /// getOperatorLoc - Return the location of the operator. 1236 SourceLocation getOperatorLoc() const { return Loc; } 1237 void setOperatorLoc(SourceLocation L) { Loc = L; } 1238 1239 /// isPostfix - Return true if this is a postfix operation, like x++. 1240 static bool isPostfix(Opcode Op) { 1241 return Op == UO_PostInc || Op == UO_PostDec; 1242 } 1243 1244 /// isPrefix - Return true if this is a prefix operation, like --x. 1245 static bool isPrefix(Opcode Op) { 1246 return Op == UO_PreInc || Op == UO_PreDec; 1247 } 1248 1249 bool isPrefix() const { return isPrefix(getOpcode()); } 1250 bool isPostfix() const { return isPostfix(getOpcode()); } 1251 bool isIncrementOp() const { 1252 return Opc == UO_PreInc || Opc == UO_PostInc; 1253 } 1254 bool isIncrementDecrementOp() const { 1255 return Opc <= UO_PreDec; 1256 } 1257 static bool isArithmeticOp(Opcode Op) { 1258 return Op >= UO_Plus && Op <= UO_LNot; 1259 } 1260 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1261 1262 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1263 /// corresponds to, e.g. "sizeof" or "[pre]++" 1264 static const char *getOpcodeStr(Opcode Op); 1265 1266 /// \brief Retrieve the unary opcode that corresponds to the given 1267 /// overloaded operator. 1268 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1269 1270 /// \brief Retrieve the overloaded operator kind that corresponds to 1271 /// the given unary opcode. 1272 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1273 1274 virtual SourceRange getSourceRange() const { 1275 if (isPostfix()) 1276 return SourceRange(Val->getLocStart(), Loc); 1277 else 1278 return SourceRange(Loc, Val->getLocEnd()); 1279 } 1280 virtual SourceLocation getExprLoc() const { return Loc; } 1281 1282 static bool classof(const Stmt *T) { 1283 return T->getStmtClass() == UnaryOperatorClass; 1284 } 1285 static bool classof(const UnaryOperator *) { return true; } 1286 1287 // Iterators 1288 virtual child_iterator child_begin(); 1289 virtual child_iterator child_end(); 1290}; 1291 1292/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1293/// offsetof(record-type, member-designator). For example, given: 1294/// @code 1295/// struct S { 1296/// float f; 1297/// double d; 1298/// }; 1299/// struct T { 1300/// int i; 1301/// struct S s[10]; 1302/// }; 1303/// @endcode 1304/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1305 1306class OffsetOfExpr : public Expr { 1307public: 1308 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1309 class OffsetOfNode { 1310 public: 1311 /// \brief The kind of offsetof node we have. 1312 enum Kind { 1313 /// \brief An index into an array. 1314 Array = 0x00, 1315 /// \brief A field. 1316 Field = 0x01, 1317 /// \brief A field in a dependent type, known only by its name. 1318 Identifier = 0x02, 1319 /// \brief An implicit indirection through a C++ base class, when the 1320 /// field found is in a base class. 1321 Base = 0x03 1322 }; 1323 1324 private: 1325 enum { MaskBits = 2, Mask = 0x03 }; 1326 1327 /// \brief The source range that covers this part of the designator. 1328 SourceRange Range; 1329 1330 /// \brief The data describing the designator, which comes in three 1331 /// different forms, depending on the lower two bits. 1332 /// - An unsigned index into the array of Expr*'s stored after this node 1333 /// in memory, for [constant-expression] designators. 1334 /// - A FieldDecl*, for references to a known field. 1335 /// - An IdentifierInfo*, for references to a field with a given name 1336 /// when the class type is dependent. 1337 /// - A CXXBaseSpecifier*, for references that look at a field in a 1338 /// base class. 1339 uintptr_t Data; 1340 1341 public: 1342 /// \brief Create an offsetof node that refers to an array element. 1343 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1344 SourceLocation RBracketLoc) 1345 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1346 1347 /// \brief Create an offsetof node that refers to a field. 1348 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1349 SourceLocation NameLoc) 1350 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1351 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1352 1353 /// \brief Create an offsetof node that refers to an identifier. 1354 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1355 SourceLocation NameLoc) 1356 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1357 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1358 1359 /// \brief Create an offsetof node that refers into a C++ base class. 1360 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1361 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1362 1363 /// \brief Determine what kind of offsetof node this is. 1364 Kind getKind() const { 1365 return static_cast<Kind>(Data & Mask); 1366 } 1367 1368 /// \brief For an array element node, returns the index into the array 1369 /// of expressions. 1370 unsigned getArrayExprIndex() const { 1371 assert(getKind() == Array); 1372 return Data >> 2; 1373 } 1374 1375 /// \brief For a field offsetof node, returns the field. 1376 FieldDecl *getField() const { 1377 assert(getKind() == Field); 1378 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1379 } 1380 1381 /// \brief For a field or identifier offsetof node, returns the name of 1382 /// the field. 1383 IdentifierInfo *getFieldName() const; 1384 1385 /// \brief For a base class node, returns the base specifier. 1386 CXXBaseSpecifier *getBase() const { 1387 assert(getKind() == Base); 1388 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1389 } 1390 1391 /// \brief Retrieve the source range that covers this offsetof node. 1392 /// 1393 /// For an array element node, the source range contains the locations of 1394 /// the square brackets. For a field or identifier node, the source range 1395 /// contains the location of the period (if there is one) and the 1396 /// identifier. 1397 SourceRange getRange() const { return Range; } 1398 }; 1399 1400private: 1401 1402 SourceLocation OperatorLoc, RParenLoc; 1403 // Base type; 1404 TypeSourceInfo *TSInfo; 1405 // Number of sub-components (i.e. instances of OffsetOfNode). 1406 unsigned NumComps; 1407 // Number of sub-expressions (i.e. array subscript expressions). 1408 unsigned NumExprs; 1409 1410 OffsetOfExpr(ASTContext &C, QualType type, 1411 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1412 OffsetOfNode* compsPtr, unsigned numComps, 1413 Expr** exprsPtr, unsigned numExprs, 1414 SourceLocation RParenLoc); 1415 1416 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1417 : Expr(OffsetOfExprClass, EmptyShell()), 1418 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1419 1420public: 1421 1422 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1423 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1424 OffsetOfNode* compsPtr, unsigned numComps, 1425 Expr** exprsPtr, unsigned numExprs, 1426 SourceLocation RParenLoc); 1427 1428 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1429 unsigned NumComps, unsigned NumExprs); 1430 1431 /// getOperatorLoc - Return the location of the operator. 1432 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1433 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1434 1435 /// \brief Return the location of the right parentheses. 1436 SourceLocation getRParenLoc() const { return RParenLoc; } 1437 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1438 1439 TypeSourceInfo *getTypeSourceInfo() const { 1440 return TSInfo; 1441 } 1442 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1443 TSInfo = tsi; 1444 } 1445 1446 const OffsetOfNode &getComponent(unsigned Idx) { 1447 assert(Idx < NumComps && "Subscript out of range"); 1448 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1449 } 1450 1451 void setComponent(unsigned Idx, OffsetOfNode ON) { 1452 assert(Idx < NumComps && "Subscript out of range"); 1453 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1454 } 1455 1456 unsigned getNumComponents() const { 1457 return NumComps; 1458 } 1459 1460 Expr* getIndexExpr(unsigned Idx) { 1461 assert(Idx < NumExprs && "Subscript out of range"); 1462 return reinterpret_cast<Expr **>( 1463 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1464 } 1465 1466 void setIndexExpr(unsigned Idx, Expr* E) { 1467 assert(Idx < NumComps && "Subscript out of range"); 1468 reinterpret_cast<Expr **>( 1469 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1470 } 1471 1472 unsigned getNumExpressions() const { 1473 return NumExprs; 1474 } 1475 1476 virtual SourceRange getSourceRange() const { 1477 return SourceRange(OperatorLoc, RParenLoc); 1478 } 1479 1480 static bool classof(const Stmt *T) { 1481 return T->getStmtClass() == OffsetOfExprClass; 1482 } 1483 1484 static bool classof(const OffsetOfExpr *) { return true; } 1485 1486 // Iterators 1487 virtual child_iterator child_begin(); 1488 virtual child_iterator child_end(); 1489}; 1490 1491/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1492/// types and expressions. 1493class SizeOfAlignOfExpr : public Expr { 1494 bool isSizeof : 1; // true if sizeof, false if alignof. 1495 bool isType : 1; // true if operand is a type, false if an expression 1496 union { 1497 TypeSourceInfo *Ty; 1498 Stmt *Ex; 1499 } Argument; 1500 SourceLocation OpLoc, RParenLoc; 1501 1502public: 1503 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1504 QualType resultType, SourceLocation op, 1505 SourceLocation rp) : 1506 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1507 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1508 // Value-dependent if the argument is type-dependent. 1509 TInfo->getType()->isDependentType(), 1510 TInfo->getType()->containsUnexpandedParameterPack()), 1511 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1512 Argument.Ty = TInfo; 1513 } 1514 1515 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1516 QualType resultType, SourceLocation op, 1517 SourceLocation rp) : 1518 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1519 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1520 // Value-dependent if the argument is type-dependent. 1521 E->isTypeDependent(), 1522 E->containsUnexpandedParameterPack()), 1523 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1524 Argument.Ex = E; 1525 } 1526 1527 /// \brief Construct an empty sizeof/alignof expression. 1528 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1529 : Expr(SizeOfAlignOfExprClass, Empty) { } 1530 1531 bool isSizeOf() const { return isSizeof; } 1532 void setSizeof(bool S) { isSizeof = S; } 1533 1534 bool isArgumentType() const { return isType; } 1535 QualType getArgumentType() const { 1536 return getArgumentTypeInfo()->getType(); 1537 } 1538 TypeSourceInfo *getArgumentTypeInfo() const { 1539 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1540 return Argument.Ty; 1541 } 1542 Expr *getArgumentExpr() { 1543 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1544 return static_cast<Expr*>(Argument.Ex); 1545 } 1546 const Expr *getArgumentExpr() const { 1547 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1548 } 1549 1550 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1551 void setArgument(TypeSourceInfo *TInfo) { 1552 Argument.Ty = TInfo; 1553 isType = true; 1554 } 1555 1556 /// Gets the argument type, or the type of the argument expression, whichever 1557 /// is appropriate. 1558 QualType getTypeOfArgument() const { 1559 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1560 } 1561 1562 SourceLocation getOperatorLoc() const { return OpLoc; } 1563 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1564 1565 SourceLocation getRParenLoc() const { return RParenLoc; } 1566 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1567 1568 virtual SourceRange getSourceRange() const { 1569 return SourceRange(OpLoc, RParenLoc); 1570 } 1571 1572 static bool classof(const Stmt *T) { 1573 return T->getStmtClass() == SizeOfAlignOfExprClass; 1574 } 1575 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1576 1577 // Iterators 1578 virtual child_iterator child_begin(); 1579 virtual child_iterator child_end(); 1580}; 1581 1582//===----------------------------------------------------------------------===// 1583// Postfix Operators. 1584//===----------------------------------------------------------------------===// 1585 1586/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1587class ArraySubscriptExpr : public Expr { 1588 enum { LHS, RHS, END_EXPR=2 }; 1589 Stmt* SubExprs[END_EXPR]; 1590 SourceLocation RBracketLoc; 1591public: 1592 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1593 ExprValueKind VK, ExprObjectKind OK, 1594 SourceLocation rbracketloc) 1595 : Expr(ArraySubscriptExprClass, t, VK, OK, 1596 lhs->isTypeDependent() || rhs->isTypeDependent(), 1597 lhs->isValueDependent() || rhs->isValueDependent(), 1598 (lhs->containsUnexpandedParameterPack() || 1599 rhs->containsUnexpandedParameterPack())), 1600 RBracketLoc(rbracketloc) { 1601 SubExprs[LHS] = lhs; 1602 SubExprs[RHS] = rhs; 1603 } 1604 1605 /// \brief Create an empty array subscript expression. 1606 explicit ArraySubscriptExpr(EmptyShell Shell) 1607 : Expr(ArraySubscriptExprClass, Shell) { } 1608 1609 /// An array access can be written A[4] or 4[A] (both are equivalent). 1610 /// - getBase() and getIdx() always present the normalized view: A[4]. 1611 /// In this case getBase() returns "A" and getIdx() returns "4". 1612 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1613 /// 4[A] getLHS() returns "4". 1614 /// Note: Because vector element access is also written A[4] we must 1615 /// predicate the format conversion in getBase and getIdx only on the 1616 /// the type of the RHS, as it is possible for the LHS to be a vector of 1617 /// integer type 1618 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1619 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1620 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1621 1622 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1623 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1624 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1625 1626 Expr *getBase() { 1627 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1628 } 1629 1630 const Expr *getBase() const { 1631 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1632 } 1633 1634 Expr *getIdx() { 1635 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1636 } 1637 1638 const Expr *getIdx() const { 1639 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1640 } 1641 1642 virtual SourceRange getSourceRange() const { 1643 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1644 } 1645 1646 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1647 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1648 1649 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1650 1651 static bool classof(const Stmt *T) { 1652 return T->getStmtClass() == ArraySubscriptExprClass; 1653 } 1654 static bool classof(const ArraySubscriptExpr *) { return true; } 1655 1656 // Iterators 1657 virtual child_iterator child_begin(); 1658 virtual child_iterator child_end(); 1659}; 1660 1661 1662/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1663/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1664/// while its subclasses may represent alternative syntax that (semantically) 1665/// results in a function call. For example, CXXOperatorCallExpr is 1666/// a subclass for overloaded operator calls that use operator syntax, e.g., 1667/// "str1 + str2" to resolve to a function call. 1668class CallExpr : public Expr { 1669 enum { FN=0, ARGS_START=1 }; 1670 Stmt **SubExprs; 1671 unsigned NumArgs; 1672 SourceLocation RParenLoc; 1673 1674protected: 1675 // This version of the constructor is for derived classes. 1676 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1677 QualType t, ExprValueKind VK, SourceLocation rparenloc); 1678 1679public: 1680 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1681 ExprValueKind VK, SourceLocation rparenloc); 1682 1683 /// \brief Build an empty call expression. 1684 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1685 1686 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1687 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1688 void setCallee(Expr *F) { SubExprs[FN] = F; } 1689 1690 Decl *getCalleeDecl(); 1691 const Decl *getCalleeDecl() const { 1692 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1693 } 1694 1695 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1696 FunctionDecl *getDirectCallee(); 1697 const FunctionDecl *getDirectCallee() const { 1698 return const_cast<CallExpr*>(this)->getDirectCallee(); 1699 } 1700 1701 /// getNumArgs - Return the number of actual arguments to this call. 1702 /// 1703 unsigned getNumArgs() const { return NumArgs; } 1704 1705 /// \brief Retrieve the call arguments. 1706 Expr **getArgs() { return reinterpret_cast<Expr **>(SubExprs + ARGS_START); } 1707 1708 /// getArg - Return the specified argument. 1709 Expr *getArg(unsigned Arg) { 1710 assert(Arg < NumArgs && "Arg access out of range!"); 1711 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1712 } 1713 const Expr *getArg(unsigned Arg) const { 1714 assert(Arg < NumArgs && "Arg access out of range!"); 1715 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1716 } 1717 1718 /// setArg - Set the specified argument. 1719 void setArg(unsigned Arg, Expr *ArgExpr) { 1720 assert(Arg < NumArgs && "Arg access out of range!"); 1721 SubExprs[Arg+ARGS_START] = ArgExpr; 1722 } 1723 1724 /// setNumArgs - This changes the number of arguments present in this call. 1725 /// Any orphaned expressions are deleted by this, and any new operands are set 1726 /// to null. 1727 void setNumArgs(ASTContext& C, unsigned NumArgs); 1728 1729 typedef ExprIterator arg_iterator; 1730 typedef ConstExprIterator const_arg_iterator; 1731 1732 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1733 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1734 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1735 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1736 1737 /// getNumCommas - Return the number of commas that must have been present in 1738 /// this function call. 1739 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1740 1741 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1742 /// not, return 0. 1743 unsigned isBuiltinCall(const ASTContext &Context) const; 1744 1745 /// getCallReturnType - Get the return type of the call expr. This is not 1746 /// always the type of the expr itself, if the return type is a reference 1747 /// type. 1748 QualType getCallReturnType() const; 1749 1750 SourceLocation getRParenLoc() const { return RParenLoc; } 1751 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1752 1753 virtual SourceRange getSourceRange() const { 1754 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1755 } 1756 1757 static bool classof(const Stmt *T) { 1758 return T->getStmtClass() >= firstCallExprConstant && 1759 T->getStmtClass() <= lastCallExprConstant; 1760 } 1761 static bool classof(const CallExpr *) { return true; } 1762 1763 // Iterators 1764 virtual child_iterator child_begin(); 1765 virtual child_iterator child_end(); 1766}; 1767 1768/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1769/// 1770class MemberExpr : public Expr { 1771 /// Extra data stored in some member expressions. 1772 struct MemberNameQualifier : public NameQualifier { 1773 DeclAccessPair FoundDecl; 1774 }; 1775 1776 /// Base - the expression for the base pointer or structure references. In 1777 /// X.F, this is "X". 1778 Stmt *Base; 1779 1780 /// MemberDecl - This is the decl being referenced by the field/member name. 1781 /// In X.F, this is the decl referenced by F. 1782 ValueDecl *MemberDecl; 1783 1784 /// MemberLoc - This is the location of the member name. 1785 SourceLocation MemberLoc; 1786 1787 /// MemberDNLoc - Provides source/type location info for the 1788 /// declaration name embedded in MemberDecl. 1789 DeclarationNameLoc MemberDNLoc; 1790 1791 /// IsArrow - True if this is "X->F", false if this is "X.F". 1792 bool IsArrow : 1; 1793 1794 /// \brief True if this member expression used a nested-name-specifier to 1795 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1796 /// declaration. When true, a MemberNameQualifier 1797 /// structure is allocated immediately after the MemberExpr. 1798 bool HasQualifierOrFoundDecl : 1; 1799 1800 /// \brief True if this member expression specified a template argument list 1801 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1802 /// structure (and its TemplateArguments) are allocated immediately after 1803 /// the MemberExpr or, if the member expression also has a qualifier, after 1804 /// the MemberNameQualifier structure. 1805 bool HasExplicitTemplateArgumentList : 1; 1806 1807 /// \brief Retrieve the qualifier that preceded the member name, if any. 1808 MemberNameQualifier *getMemberQualifier() { 1809 assert(HasQualifierOrFoundDecl); 1810 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1811 } 1812 1813 /// \brief Retrieve the qualifier that preceded the member name, if any. 1814 const MemberNameQualifier *getMemberQualifier() const { 1815 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1816 } 1817 1818public: 1819 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1820 const DeclarationNameInfo &NameInfo, QualType ty, 1821 ExprValueKind VK, ExprObjectKind OK) 1822 : Expr(MemberExprClass, ty, VK, OK, 1823 base->isTypeDependent(), base->isValueDependent(), 1824 base->containsUnexpandedParameterPack()), 1825 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1826 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1827 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1828 assert(memberdecl->getDeclName() == NameInfo.getName()); 1829 } 1830 1831 // NOTE: this constructor should be used only when it is known that 1832 // the member name can not provide additional syntactic info 1833 // (i.e., source locations for C++ operator names or type source info 1834 // for constructors, destructors and conversion oeprators). 1835 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1836 SourceLocation l, QualType ty, 1837 ExprValueKind VK, ExprObjectKind OK) 1838 : Expr(MemberExprClass, ty, VK, OK, 1839 base->isTypeDependent(), base->isValueDependent(), 1840 base->containsUnexpandedParameterPack()), 1841 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1842 IsArrow(isarrow), 1843 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1844 1845 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1846 NestedNameSpecifier *qual, SourceRange qualrange, 1847 ValueDecl *memberdecl, DeclAccessPair founddecl, 1848 DeclarationNameInfo MemberNameInfo, 1849 const TemplateArgumentListInfo *targs, 1850 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1851 1852 void setBase(Expr *E) { Base = E; } 1853 Expr *getBase() const { return cast<Expr>(Base); } 1854 1855 /// \brief Retrieve the member declaration to which this expression refers. 1856 /// 1857 /// The returned declaration will either be a FieldDecl or (in C++) 1858 /// a CXXMethodDecl. 1859 ValueDecl *getMemberDecl() const { return MemberDecl; } 1860 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1861 1862 /// \brief Retrieves the declaration found by lookup. 1863 DeclAccessPair getFoundDecl() const { 1864 if (!HasQualifierOrFoundDecl) 1865 return DeclAccessPair::make(getMemberDecl(), 1866 getMemberDecl()->getAccess()); 1867 return getMemberQualifier()->FoundDecl; 1868 } 1869 1870 /// \brief Determines whether this member expression actually had 1871 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1872 /// x->Base::foo. 1873 bool hasQualifier() const { return getQualifier() != 0; } 1874 1875 /// \brief If the member name was qualified, retrieves the source range of 1876 /// the nested-name-specifier that precedes the member name. Otherwise, 1877 /// returns an empty source range. 1878 SourceRange getQualifierRange() const { 1879 if (!HasQualifierOrFoundDecl) 1880 return SourceRange(); 1881 1882 return getMemberQualifier()->Range; 1883 } 1884 1885 /// \brief If the member name was qualified, retrieves the 1886 /// nested-name-specifier that precedes the member name. Otherwise, returns 1887 /// NULL. 1888 NestedNameSpecifier *getQualifier() const { 1889 if (!HasQualifierOrFoundDecl) 1890 return 0; 1891 1892 return getMemberQualifier()->NNS; 1893 } 1894 1895 /// \brief Determines whether this member expression actually had a C++ 1896 /// template argument list explicitly specified, e.g., x.f<int>. 1897 bool hasExplicitTemplateArgs() const { 1898 return HasExplicitTemplateArgumentList; 1899 } 1900 1901 /// \brief Copies the template arguments (if present) into the given 1902 /// structure. 1903 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1904 if (hasExplicitTemplateArgs()) 1905 getExplicitTemplateArgs().copyInto(List); 1906 } 1907 1908 /// \brief Retrieve the explicit template argument list that 1909 /// follow the member template name. This must only be called on an 1910 /// expression with explicit template arguments. 1911 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1912 assert(HasExplicitTemplateArgumentList); 1913 if (!HasQualifierOrFoundDecl) 1914 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1915 1916 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1917 getMemberQualifier() + 1); 1918 } 1919 1920 /// \brief Retrieve the explicit template argument list that 1921 /// followed the member template name. This must only be called on 1922 /// an expression with explicit template arguments. 1923 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1924 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1925 } 1926 1927 /// \brief Retrieves the optional explicit template arguments. 1928 /// This points to the same data as getExplicitTemplateArgs(), but 1929 /// returns null if there are no explicit template arguments. 1930 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1931 if (!hasExplicitTemplateArgs()) return 0; 1932 return &getExplicitTemplateArgs(); 1933 } 1934 1935 /// \brief Retrieve the location of the left angle bracket following the 1936 /// member name ('<'), if any. 1937 SourceLocation getLAngleLoc() const { 1938 if (!HasExplicitTemplateArgumentList) 1939 return SourceLocation(); 1940 1941 return getExplicitTemplateArgs().LAngleLoc; 1942 } 1943 1944 /// \brief Retrieve the template arguments provided as part of this 1945 /// template-id. 1946 const TemplateArgumentLoc *getTemplateArgs() const { 1947 if (!HasExplicitTemplateArgumentList) 1948 return 0; 1949 1950 return getExplicitTemplateArgs().getTemplateArgs(); 1951 } 1952 1953 /// \brief Retrieve the number of template arguments provided as part of this 1954 /// template-id. 1955 unsigned getNumTemplateArgs() const { 1956 if (!HasExplicitTemplateArgumentList) 1957 return 0; 1958 1959 return getExplicitTemplateArgs().NumTemplateArgs; 1960 } 1961 1962 /// \brief Retrieve the location of the right angle bracket following the 1963 /// template arguments ('>'). 1964 SourceLocation getRAngleLoc() const { 1965 if (!HasExplicitTemplateArgumentList) 1966 return SourceLocation(); 1967 1968 return getExplicitTemplateArgs().RAngleLoc; 1969 } 1970 1971 /// \brief Retrieve the member declaration name info. 1972 DeclarationNameInfo getMemberNameInfo() const { 1973 return DeclarationNameInfo(MemberDecl->getDeclName(), 1974 MemberLoc, MemberDNLoc); 1975 } 1976 1977 bool isArrow() const { return IsArrow; } 1978 void setArrow(bool A) { IsArrow = A; } 1979 1980 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1981 /// location of 'F'. 1982 SourceLocation getMemberLoc() const { return MemberLoc; } 1983 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1984 1985 virtual SourceRange getSourceRange() const { 1986 // If we have an implicit base (like a C++ implicit this), 1987 // make sure not to return its location 1988 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1989 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1990 1991 SourceLocation BaseLoc = getBase()->getLocStart(); 1992 if (BaseLoc.isInvalid()) 1993 return SourceRange(MemberLoc, EndLoc); 1994 return SourceRange(BaseLoc, EndLoc); 1995 } 1996 1997 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1998 1999 static bool classof(const Stmt *T) { 2000 return T->getStmtClass() == MemberExprClass; 2001 } 2002 static bool classof(const MemberExpr *) { return true; } 2003 2004 // Iterators 2005 virtual child_iterator child_begin(); 2006 virtual child_iterator child_end(); 2007 2008 friend class ASTReader; 2009 friend class ASTStmtWriter; 2010}; 2011 2012/// CompoundLiteralExpr - [C99 6.5.2.5] 2013/// 2014class CompoundLiteralExpr : public Expr { 2015 /// LParenLoc - If non-null, this is the location of the left paren in a 2016 /// compound literal like "(int){4}". This can be null if this is a 2017 /// synthesized compound expression. 2018 SourceLocation LParenLoc; 2019 2020 /// The type as written. This can be an incomplete array type, in 2021 /// which case the actual expression type will be different. 2022 TypeSourceInfo *TInfo; 2023 Stmt *Init; 2024 bool FileScope; 2025public: 2026 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2027 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2028 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2029 tinfo->getType()->isDependentType(), 2030 init->isValueDependent(), 2031 init->containsUnexpandedParameterPack()), 2032 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2033 2034 /// \brief Construct an empty compound literal. 2035 explicit CompoundLiteralExpr(EmptyShell Empty) 2036 : Expr(CompoundLiteralExprClass, Empty) { } 2037 2038 const Expr *getInitializer() const { return cast<Expr>(Init); } 2039 Expr *getInitializer() { return cast<Expr>(Init); } 2040 void setInitializer(Expr *E) { Init = E; } 2041 2042 bool isFileScope() const { return FileScope; } 2043 void setFileScope(bool FS) { FileScope = FS; } 2044 2045 SourceLocation getLParenLoc() const { return LParenLoc; } 2046 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2047 2048 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2049 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2050 2051 virtual SourceRange getSourceRange() const { 2052 // FIXME: Init should never be null. 2053 if (!Init) 2054 return SourceRange(); 2055 if (LParenLoc.isInvalid()) 2056 return Init->getSourceRange(); 2057 return SourceRange(LParenLoc, Init->getLocEnd()); 2058 } 2059 2060 static bool classof(const Stmt *T) { 2061 return T->getStmtClass() == CompoundLiteralExprClass; 2062 } 2063 static bool classof(const CompoundLiteralExpr *) { return true; } 2064 2065 // Iterators 2066 virtual child_iterator child_begin(); 2067 virtual child_iterator child_end(); 2068}; 2069 2070/// CastExpr - Base class for type casts, including both implicit 2071/// casts (ImplicitCastExpr) and explicit casts that have some 2072/// representation in the source code (ExplicitCastExpr's derived 2073/// classes). 2074class CastExpr : public Expr { 2075public: 2076 typedef clang::CastKind CastKind; 2077 2078private: 2079 Stmt *Op; 2080 2081 void CheckCastConsistency() const { 2082#ifndef NDEBUG 2083 switch (getCastKind()) { 2084 case CK_DerivedToBase: 2085 case CK_UncheckedDerivedToBase: 2086 case CK_DerivedToBaseMemberPointer: 2087 case CK_BaseToDerived: 2088 case CK_BaseToDerivedMemberPointer: 2089 assert(!path_empty() && "Cast kind should have a base path!"); 2090 break; 2091 2092 // These should not have an inheritance path. 2093 case CK_BitCast: 2094 case CK_Dynamic: 2095 case CK_ToUnion: 2096 case CK_ArrayToPointerDecay: 2097 case CK_FunctionToPointerDecay: 2098 case CK_NullToMemberPointer: 2099 case CK_NullToPointer: 2100 case CK_ConstructorConversion: 2101 case CK_IntegralToPointer: 2102 case CK_PointerToIntegral: 2103 case CK_ToVoid: 2104 case CK_VectorSplat: 2105 case CK_IntegralCast: 2106 case CK_IntegralToFloating: 2107 case CK_FloatingToIntegral: 2108 case CK_FloatingCast: 2109 case CK_AnyPointerToObjCPointerCast: 2110 case CK_AnyPointerToBlockPointerCast: 2111 case CK_ObjCObjectLValueCast: 2112 case CK_FloatingRealToComplex: 2113 case CK_FloatingComplexToReal: 2114 case CK_FloatingComplexCast: 2115 case CK_FloatingComplexToIntegralComplex: 2116 case CK_IntegralRealToComplex: 2117 case CK_IntegralComplexToReal: 2118 case CK_IntegralComplexCast: 2119 case CK_IntegralComplexToFloatingComplex: 2120 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2121 // fallthrough to check for null base path 2122 2123 case CK_Dependent: 2124 case CK_LValueToRValue: 2125 case CK_GetObjCProperty: 2126 case CK_NoOp: 2127 case CK_PointerToBoolean: 2128 case CK_IntegralToBoolean: 2129 case CK_FloatingToBoolean: 2130 case CK_MemberPointerToBoolean: 2131 case CK_FloatingComplexToBoolean: 2132 case CK_IntegralComplexToBoolean: 2133 case CK_LValueBitCast: // -> bool& 2134 case CK_UserDefinedConversion: // operator bool() 2135 assert(path_empty() && "Cast kind should not have a base path!"); 2136 break; 2137 } 2138#endif 2139 } 2140 2141 const CXXBaseSpecifier * const *path_buffer() const { 2142 return const_cast<CastExpr*>(this)->path_buffer(); 2143 } 2144 CXXBaseSpecifier **path_buffer(); 2145 2146protected: 2147 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2148 const CastKind kind, Expr *op, unsigned BasePathSize) : 2149 Expr(SC, ty, VK, OK_Ordinary, 2150 // Cast expressions are type-dependent if the type is 2151 // dependent (C++ [temp.dep.expr]p3). 2152 ty->isDependentType(), 2153 // Cast expressions are value-dependent if the type is 2154 // dependent or if the subexpression is value-dependent. 2155 ty->isDependentType() || (op && op->isValueDependent()), 2156 (ty->containsUnexpandedParameterPack() || 2157 op->containsUnexpandedParameterPack())), 2158 Op(op) { 2159 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2160 CastExprBits.Kind = kind; 2161 CastExprBits.BasePathSize = BasePathSize; 2162 CheckCastConsistency(); 2163 } 2164 2165 /// \brief Construct an empty cast. 2166 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2167 : Expr(SC, Empty) { 2168 CastExprBits.BasePathSize = BasePathSize; 2169 } 2170 2171public: 2172 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2173 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2174 const char *getCastKindName() const; 2175 2176 Expr *getSubExpr() { return cast<Expr>(Op); } 2177 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2178 void setSubExpr(Expr *E) { Op = E; } 2179 2180 /// \brief Retrieve the cast subexpression as it was written in the source 2181 /// code, looking through any implicit casts or other intermediate nodes 2182 /// introduced by semantic analysis. 2183 Expr *getSubExprAsWritten(); 2184 const Expr *getSubExprAsWritten() const { 2185 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2186 } 2187 2188 typedef CXXBaseSpecifier **path_iterator; 2189 typedef const CXXBaseSpecifier * const *path_const_iterator; 2190 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2191 unsigned path_size() const { return CastExprBits.BasePathSize; } 2192 path_iterator path_begin() { return path_buffer(); } 2193 path_iterator path_end() { return path_buffer() + path_size(); } 2194 path_const_iterator path_begin() const { return path_buffer(); } 2195 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2196 2197 void setCastPath(const CXXCastPath &Path); 2198 2199 static bool classof(const Stmt *T) { 2200 return T->getStmtClass() >= firstCastExprConstant && 2201 T->getStmtClass() <= lastCastExprConstant; 2202 } 2203 static bool classof(const CastExpr *) { return true; } 2204 2205 // Iterators 2206 virtual child_iterator child_begin(); 2207 virtual child_iterator child_end(); 2208}; 2209 2210/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2211/// conversions, which have no direct representation in the original 2212/// source code. For example: converting T[]->T*, void f()->void 2213/// (*f)(), float->double, short->int, etc. 2214/// 2215/// In C, implicit casts always produce rvalues. However, in C++, an 2216/// implicit cast whose result is being bound to a reference will be 2217/// an lvalue or xvalue. For example: 2218/// 2219/// @code 2220/// class Base { }; 2221/// class Derived : public Base { }; 2222/// Derived &&ref(); 2223/// void f(Derived d) { 2224/// Base& b = d; // initializer is an ImplicitCastExpr 2225/// // to an lvalue of type Base 2226/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2227/// // to an xvalue of type Base 2228/// } 2229/// @endcode 2230class ImplicitCastExpr : public CastExpr { 2231private: 2232 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2233 unsigned BasePathLength, ExprValueKind VK) 2234 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2235 } 2236 2237 /// \brief Construct an empty implicit cast. 2238 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2239 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2240 2241public: 2242 enum OnStack_t { OnStack }; 2243 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2244 ExprValueKind VK) 2245 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2246 } 2247 2248 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2249 CastKind Kind, Expr *Operand, 2250 const CXXCastPath *BasePath, 2251 ExprValueKind Cat); 2252 2253 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2254 2255 virtual SourceRange getSourceRange() const { 2256 return getSubExpr()->getSourceRange(); 2257 } 2258 2259 static bool classof(const Stmt *T) { 2260 return T->getStmtClass() == ImplicitCastExprClass; 2261 } 2262 static bool classof(const ImplicitCastExpr *) { return true; } 2263}; 2264 2265/// ExplicitCastExpr - An explicit cast written in the source 2266/// code. 2267/// 2268/// This class is effectively an abstract class, because it provides 2269/// the basic representation of an explicitly-written cast without 2270/// specifying which kind of cast (C cast, functional cast, static 2271/// cast, etc.) was written; specific derived classes represent the 2272/// particular style of cast and its location information. 2273/// 2274/// Unlike implicit casts, explicit cast nodes have two different 2275/// types: the type that was written into the source code, and the 2276/// actual type of the expression as determined by semantic 2277/// analysis. These types may differ slightly. For example, in C++ one 2278/// can cast to a reference type, which indicates that the resulting 2279/// expression will be an lvalue or xvalue. The reference type, however, 2280/// will not be used as the type of the expression. 2281class ExplicitCastExpr : public CastExpr { 2282 /// TInfo - Source type info for the (written) type 2283 /// this expression is casting to. 2284 TypeSourceInfo *TInfo; 2285 2286protected: 2287 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2288 CastKind kind, Expr *op, unsigned PathSize, 2289 TypeSourceInfo *writtenTy) 2290 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2291 2292 /// \brief Construct an empty explicit cast. 2293 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2294 : CastExpr(SC, Shell, PathSize) { } 2295 2296public: 2297 /// getTypeInfoAsWritten - Returns the type source info for the type 2298 /// that this expression is casting to. 2299 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2300 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2301 2302 /// getTypeAsWritten - Returns the type that this expression is 2303 /// casting to, as written in the source code. 2304 QualType getTypeAsWritten() const { return TInfo->getType(); } 2305 2306 static bool classof(const Stmt *T) { 2307 return T->getStmtClass() >= firstExplicitCastExprConstant && 2308 T->getStmtClass() <= lastExplicitCastExprConstant; 2309 } 2310 static bool classof(const ExplicitCastExpr *) { return true; } 2311}; 2312 2313/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2314/// cast in C++ (C++ [expr.cast]), which uses the syntax 2315/// (Type)expr. For example: @c (int)f. 2316class CStyleCastExpr : public ExplicitCastExpr { 2317 SourceLocation LPLoc; // the location of the left paren 2318 SourceLocation RPLoc; // the location of the right paren 2319 2320 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2321 unsigned PathSize, TypeSourceInfo *writtenTy, 2322 SourceLocation l, SourceLocation r) 2323 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2324 writtenTy), LPLoc(l), RPLoc(r) {} 2325 2326 /// \brief Construct an empty C-style explicit cast. 2327 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2328 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2329 2330public: 2331 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2332 ExprValueKind VK, CastKind K, 2333 Expr *Op, const CXXCastPath *BasePath, 2334 TypeSourceInfo *WrittenTy, SourceLocation L, 2335 SourceLocation R); 2336 2337 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2338 2339 SourceLocation getLParenLoc() const { return LPLoc; } 2340 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2341 2342 SourceLocation getRParenLoc() const { return RPLoc; } 2343 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2344 2345 virtual SourceRange getSourceRange() const { 2346 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2347 } 2348 static bool classof(const Stmt *T) { 2349 return T->getStmtClass() == CStyleCastExprClass; 2350 } 2351 static bool classof(const CStyleCastExpr *) { return true; } 2352}; 2353 2354/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2355/// 2356/// This expression node kind describes a builtin binary operation, 2357/// such as "x + y" for integer values "x" and "y". The operands will 2358/// already have been converted to appropriate types (e.g., by 2359/// performing promotions or conversions). 2360/// 2361/// In C++, where operators may be overloaded, a different kind of 2362/// expression node (CXXOperatorCallExpr) is used to express the 2363/// invocation of an overloaded operator with operator syntax. Within 2364/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2365/// used to store an expression "x + y" depends on the subexpressions 2366/// for x and y. If neither x or y is type-dependent, and the "+" 2367/// operator resolves to a built-in operation, BinaryOperator will be 2368/// used to express the computation (x and y may still be 2369/// value-dependent). If either x or y is type-dependent, or if the 2370/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2371/// be used to express the computation. 2372class BinaryOperator : public Expr { 2373public: 2374 typedef BinaryOperatorKind Opcode; 2375 2376private: 2377 unsigned Opc : 6; 2378 SourceLocation OpLoc; 2379 2380 enum { LHS, RHS, END_EXPR }; 2381 Stmt* SubExprs[END_EXPR]; 2382public: 2383 2384 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2385 ExprValueKind VK, ExprObjectKind OK, 2386 SourceLocation opLoc) 2387 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2388 lhs->isTypeDependent() || rhs->isTypeDependent(), 2389 lhs->isValueDependent() || rhs->isValueDependent(), 2390 (lhs->containsUnexpandedParameterPack() || 2391 rhs->containsUnexpandedParameterPack())), 2392 Opc(opc), OpLoc(opLoc) { 2393 SubExprs[LHS] = lhs; 2394 SubExprs[RHS] = rhs; 2395 assert(!isCompoundAssignmentOp() && 2396 "Use ArithAssignBinaryOperator for compound assignments"); 2397 } 2398 2399 /// \brief Construct an empty binary operator. 2400 explicit BinaryOperator(EmptyShell Empty) 2401 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2402 2403 SourceLocation getOperatorLoc() const { return OpLoc; } 2404 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2405 2406 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2407 void setOpcode(Opcode O) { Opc = O; } 2408 2409 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2410 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2411 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2412 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2413 2414 virtual SourceRange getSourceRange() const { 2415 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2416 } 2417 2418 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2419 /// corresponds to, e.g. "<<=". 2420 static const char *getOpcodeStr(Opcode Op); 2421 2422 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2423 2424 /// \brief Retrieve the binary opcode that corresponds to the given 2425 /// overloaded operator. 2426 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2427 2428 /// \brief Retrieve the overloaded operator kind that corresponds to 2429 /// the given binary opcode. 2430 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2431 2432 /// predicates to categorize the respective opcodes. 2433 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2434 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2435 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2436 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2437 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2438 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2439 2440 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2441 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2442 2443 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2444 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2445 2446 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2447 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2448 2449 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2450 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2451 2452 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2453 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2454 2455 static bool isAssignmentOp(Opcode Opc) { 2456 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2457 } 2458 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2459 2460 static bool isCompoundAssignmentOp(Opcode Opc) { 2461 return Opc > BO_Assign && Opc <= BO_OrAssign; 2462 } 2463 bool isCompoundAssignmentOp() const { 2464 return isCompoundAssignmentOp(getOpcode()); 2465 } 2466 2467 static bool isShiftAssignOp(Opcode Opc) { 2468 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2469 } 2470 bool isShiftAssignOp() const { 2471 return isShiftAssignOp(getOpcode()); 2472 } 2473 2474 static bool classof(const Stmt *S) { 2475 return S->getStmtClass() >= firstBinaryOperatorConstant && 2476 S->getStmtClass() <= lastBinaryOperatorConstant; 2477 } 2478 static bool classof(const BinaryOperator *) { return true; } 2479 2480 // Iterators 2481 virtual child_iterator child_begin(); 2482 virtual child_iterator child_end(); 2483 2484protected: 2485 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2486 ExprValueKind VK, ExprObjectKind OK, 2487 SourceLocation opLoc, bool dead) 2488 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2489 lhs->isTypeDependent() || rhs->isTypeDependent(), 2490 lhs->isValueDependent() || rhs->isValueDependent(), 2491 (lhs->containsUnexpandedParameterPack() || 2492 rhs->containsUnexpandedParameterPack())), 2493 Opc(opc), OpLoc(opLoc) { 2494 SubExprs[LHS] = lhs; 2495 SubExprs[RHS] = rhs; 2496 } 2497 2498 BinaryOperator(StmtClass SC, EmptyShell Empty) 2499 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2500}; 2501 2502/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2503/// track of the type the operation is performed in. Due to the semantics of 2504/// these operators, the operands are promoted, the aritmetic performed, an 2505/// implicit conversion back to the result type done, then the assignment takes 2506/// place. This captures the intermediate type which the computation is done 2507/// in. 2508class CompoundAssignOperator : public BinaryOperator { 2509 QualType ComputationLHSType; 2510 QualType ComputationResultType; 2511public: 2512 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2513 ExprValueKind VK, ExprObjectKind OK, 2514 QualType CompLHSType, QualType CompResultType, 2515 SourceLocation OpLoc) 2516 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2517 ComputationLHSType(CompLHSType), 2518 ComputationResultType(CompResultType) { 2519 assert(isCompoundAssignmentOp() && 2520 "Only should be used for compound assignments"); 2521 } 2522 2523 /// \brief Build an empty compound assignment operator expression. 2524 explicit CompoundAssignOperator(EmptyShell Empty) 2525 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2526 2527 // The two computation types are the type the LHS is converted 2528 // to for the computation and the type of the result; the two are 2529 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2530 QualType getComputationLHSType() const { return ComputationLHSType; } 2531 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2532 2533 QualType getComputationResultType() const { return ComputationResultType; } 2534 void setComputationResultType(QualType T) { ComputationResultType = T; } 2535 2536 static bool classof(const CompoundAssignOperator *) { return true; } 2537 static bool classof(const Stmt *S) { 2538 return S->getStmtClass() == CompoundAssignOperatorClass; 2539 } 2540}; 2541 2542/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2543/// GNU "missing LHS" extension is in use. 2544/// 2545class ConditionalOperator : public Expr { 2546 enum { COND, LHS, RHS, END_EXPR }; 2547 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2548 Stmt* Save; 2549 SourceLocation QuestionLoc, ColonLoc; 2550public: 2551 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2552 SourceLocation CLoc, Expr *rhs, Expr *save, 2553 QualType t, ExprValueKind VK, ExprObjectKind OK) 2554 : Expr(ConditionalOperatorClass, t, VK, OK, 2555 // FIXME: the type of the conditional operator doesn't 2556 // depend on the type of the conditional, but the standard 2557 // seems to imply that it could. File a bug! 2558 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2559 (cond->isValueDependent() || 2560 (lhs && lhs->isValueDependent()) || 2561 (rhs && rhs->isValueDependent())), 2562 (cond->containsUnexpandedParameterPack() || 2563 (lhs && lhs->containsUnexpandedParameterPack()) || 2564 (rhs && rhs->containsUnexpandedParameterPack()))), 2565 QuestionLoc(QLoc), 2566 ColonLoc(CLoc) { 2567 SubExprs[COND] = cond; 2568 SubExprs[LHS] = lhs; 2569 SubExprs[RHS] = rhs; 2570 Save = save; 2571 } 2572 2573 /// \brief Build an empty conditional operator. 2574 explicit ConditionalOperator(EmptyShell Empty) 2575 : Expr(ConditionalOperatorClass, Empty) { } 2576 2577 // getCond - Return the expression representing the condition for 2578 // the ?: operator. 2579 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2580 void setCond(Expr *E) { SubExprs[COND] = E; } 2581 2582 // getTrueExpr - Return the subexpression representing the value of the ?: 2583 // expression if the condition evaluates to true. 2584 Expr *getTrueExpr() const { 2585 return cast<Expr>(SubExprs[LHS]); 2586 } 2587 2588 // getFalseExpr - Return the subexpression representing the value of the ?: 2589 // expression if the condition evaluates to false. This is the same as getRHS. 2590 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2591 2592 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2593 // allows the left subexpression to be omitted, and instead of that condition 2594 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2595 // expression "x" is only evaluated once. Under this senario, this function 2596 // returns the original, non-converted condition expression for the ?:operator 2597 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2598 2599 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2600 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2601 2602 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2603 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2604 2605 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2606 void setSAVE(Expr *E) { Save = E; } 2607 2608 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2609 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2610 2611 SourceLocation getColonLoc() const { return ColonLoc; } 2612 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2613 2614 virtual SourceRange getSourceRange() const { 2615 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2616 } 2617 static bool classof(const Stmt *T) { 2618 return T->getStmtClass() == ConditionalOperatorClass; 2619 } 2620 static bool classof(const ConditionalOperator *) { return true; } 2621 2622 // Iterators 2623 virtual child_iterator child_begin(); 2624 virtual child_iterator child_end(); 2625}; 2626 2627/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2628class AddrLabelExpr : public Expr { 2629 SourceLocation AmpAmpLoc, LabelLoc; 2630 LabelStmt *Label; 2631public: 2632 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2633 QualType t) 2634 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2635 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2636 2637 /// \brief Build an empty address of a label expression. 2638 explicit AddrLabelExpr(EmptyShell Empty) 2639 : Expr(AddrLabelExprClass, Empty) { } 2640 2641 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2642 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2643 SourceLocation getLabelLoc() const { return LabelLoc; } 2644 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2645 2646 virtual SourceRange getSourceRange() const { 2647 return SourceRange(AmpAmpLoc, LabelLoc); 2648 } 2649 2650 LabelStmt *getLabel() const { return Label; } 2651 void setLabel(LabelStmt *S) { Label = S; } 2652 2653 static bool classof(const Stmt *T) { 2654 return T->getStmtClass() == AddrLabelExprClass; 2655 } 2656 static bool classof(const AddrLabelExpr *) { return true; } 2657 2658 // Iterators 2659 virtual child_iterator child_begin(); 2660 virtual child_iterator child_end(); 2661}; 2662 2663/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2664/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2665/// takes the value of the last subexpression. 2666/// 2667/// A StmtExpr is always an r-value; values "returned" out of a 2668/// StmtExpr will be copied. 2669class StmtExpr : public Expr { 2670 Stmt *SubStmt; 2671 SourceLocation LParenLoc, RParenLoc; 2672public: 2673 // FIXME: Does type-dependence need to be computed differently? 2674 StmtExpr(CompoundStmt *substmt, QualType T, 2675 SourceLocation lp, SourceLocation rp) : 2676 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2677 T->isDependentType(), false, false), 2678 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2679 2680 /// \brief Build an empty statement expression. 2681 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2682 2683 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2684 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2685 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2686 2687 virtual SourceRange getSourceRange() const { 2688 return SourceRange(LParenLoc, RParenLoc); 2689 } 2690 2691 SourceLocation getLParenLoc() const { return LParenLoc; } 2692 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2693 SourceLocation getRParenLoc() const { return RParenLoc; } 2694 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2695 2696 static bool classof(const Stmt *T) { 2697 return T->getStmtClass() == StmtExprClass; 2698 } 2699 static bool classof(const StmtExpr *) { return true; } 2700 2701 // Iterators 2702 virtual child_iterator child_begin(); 2703 virtual child_iterator child_end(); 2704}; 2705 2706 2707/// ShuffleVectorExpr - clang-specific builtin-in function 2708/// __builtin_shufflevector. 2709/// This AST node represents a operator that does a constant 2710/// shuffle, similar to LLVM's shufflevector instruction. It takes 2711/// two vectors and a variable number of constant indices, 2712/// and returns the appropriately shuffled vector. 2713class ShuffleVectorExpr : public Expr { 2714 SourceLocation BuiltinLoc, RParenLoc; 2715 2716 // SubExprs - the list of values passed to the __builtin_shufflevector 2717 // function. The first two are vectors, and the rest are constant 2718 // indices. The number of values in this list is always 2719 // 2+the number of indices in the vector type. 2720 Stmt **SubExprs; 2721 unsigned NumExprs; 2722 2723public: 2724 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2725 QualType Type, SourceLocation BLoc, 2726 SourceLocation RP); 2727 2728 /// \brief Build an empty vector-shuffle expression. 2729 explicit ShuffleVectorExpr(EmptyShell Empty) 2730 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2731 2732 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2733 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2734 2735 SourceLocation getRParenLoc() const { return RParenLoc; } 2736 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2737 2738 virtual SourceRange getSourceRange() const { 2739 return SourceRange(BuiltinLoc, RParenLoc); 2740 } 2741 static bool classof(const Stmt *T) { 2742 return T->getStmtClass() == ShuffleVectorExprClass; 2743 } 2744 static bool classof(const ShuffleVectorExpr *) { return true; } 2745 2746 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2747 /// constant expression, the actual arguments passed in, and the function 2748 /// pointers. 2749 unsigned getNumSubExprs() const { return NumExprs; } 2750 2751 /// \brief Retrieve the array of expressions. 2752 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2753 2754 /// getExpr - Return the Expr at the specified index. 2755 Expr *getExpr(unsigned Index) { 2756 assert((Index < NumExprs) && "Arg access out of range!"); 2757 return cast<Expr>(SubExprs[Index]); 2758 } 2759 const Expr *getExpr(unsigned Index) const { 2760 assert((Index < NumExprs) && "Arg access out of range!"); 2761 return cast<Expr>(SubExprs[Index]); 2762 } 2763 2764 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2765 2766 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2767 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2768 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2769 } 2770 2771 // Iterators 2772 virtual child_iterator child_begin(); 2773 virtual child_iterator child_end(); 2774}; 2775 2776/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2777/// This AST node is similar to the conditional operator (?:) in C, with 2778/// the following exceptions: 2779/// - the test expression must be a integer constant expression. 2780/// - the expression returned acts like the chosen subexpression in every 2781/// visible way: the type is the same as that of the chosen subexpression, 2782/// and all predicates (whether it's an l-value, whether it's an integer 2783/// constant expression, etc.) return the same result as for the chosen 2784/// sub-expression. 2785class ChooseExpr : public Expr { 2786 enum { COND, LHS, RHS, END_EXPR }; 2787 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2788 SourceLocation BuiltinLoc, RParenLoc; 2789public: 2790 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2791 QualType t, ExprValueKind VK, ExprObjectKind OK, 2792 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2793 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 2794 (cond->containsUnexpandedParameterPack() || 2795 lhs->containsUnexpandedParameterPack() || 2796 rhs->containsUnexpandedParameterPack())), 2797 BuiltinLoc(BLoc), RParenLoc(RP) { 2798 SubExprs[COND] = cond; 2799 SubExprs[LHS] = lhs; 2800 SubExprs[RHS] = rhs; 2801 } 2802 2803 /// \brief Build an empty __builtin_choose_expr. 2804 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2805 2806 /// isConditionTrue - Return whether the condition is true (i.e. not 2807 /// equal to zero). 2808 bool isConditionTrue(const ASTContext &C) const; 2809 2810 /// getChosenSubExpr - Return the subexpression chosen according to the 2811 /// condition. 2812 Expr *getChosenSubExpr(const ASTContext &C) const { 2813 return isConditionTrue(C) ? getLHS() : getRHS(); 2814 } 2815 2816 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2817 void setCond(Expr *E) { SubExprs[COND] = E; } 2818 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2819 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2820 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2821 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2822 2823 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2824 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2825 2826 SourceLocation getRParenLoc() const { return RParenLoc; } 2827 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2828 2829 virtual SourceRange getSourceRange() const { 2830 return SourceRange(BuiltinLoc, RParenLoc); 2831 } 2832 static bool classof(const Stmt *T) { 2833 return T->getStmtClass() == ChooseExprClass; 2834 } 2835 static bool classof(const ChooseExpr *) { return true; } 2836 2837 // Iterators 2838 virtual child_iterator child_begin(); 2839 virtual child_iterator child_end(); 2840}; 2841 2842/// GNUNullExpr - Implements the GNU __null extension, which is a name 2843/// for a null pointer constant that has integral type (e.g., int or 2844/// long) and is the same size and alignment as a pointer. The __null 2845/// extension is typically only used by system headers, which define 2846/// NULL as __null in C++ rather than using 0 (which is an integer 2847/// that may not match the size of a pointer). 2848class GNUNullExpr : public Expr { 2849 /// TokenLoc - The location of the __null keyword. 2850 SourceLocation TokenLoc; 2851 2852public: 2853 GNUNullExpr(QualType Ty, SourceLocation Loc) 2854 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 2855 TokenLoc(Loc) { } 2856 2857 /// \brief Build an empty GNU __null expression. 2858 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2859 2860 /// getTokenLocation - The location of the __null token. 2861 SourceLocation getTokenLocation() const { return TokenLoc; } 2862 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2863 2864 virtual SourceRange getSourceRange() const { 2865 return SourceRange(TokenLoc); 2866 } 2867 static bool classof(const Stmt *T) { 2868 return T->getStmtClass() == GNUNullExprClass; 2869 } 2870 static bool classof(const GNUNullExpr *) { return true; } 2871 2872 // Iterators 2873 virtual child_iterator child_begin(); 2874 virtual child_iterator child_end(); 2875}; 2876 2877/// VAArgExpr, used for the builtin function __builtin_va_arg. 2878class VAArgExpr : public Expr { 2879 Stmt *Val; 2880 TypeSourceInfo *TInfo; 2881 SourceLocation BuiltinLoc, RParenLoc; 2882public: 2883 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2884 SourceLocation RPLoc, QualType t) 2885 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 2886 t->isDependentType(), false, 2887 (TInfo->getType()->containsUnexpandedParameterPack() || 2888 e->containsUnexpandedParameterPack())), 2889 Val(e), TInfo(TInfo), 2890 BuiltinLoc(BLoc), 2891 RParenLoc(RPLoc) { } 2892 2893 /// \brief Create an empty __builtin_va_arg expression. 2894 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2895 2896 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2897 Expr *getSubExpr() { return cast<Expr>(Val); } 2898 void setSubExpr(Expr *E) { Val = E; } 2899 2900 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2901 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2902 2903 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2904 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2905 2906 SourceLocation getRParenLoc() const { return RParenLoc; } 2907 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2908 2909 virtual SourceRange getSourceRange() const { 2910 return SourceRange(BuiltinLoc, RParenLoc); 2911 } 2912 static bool classof(const Stmt *T) { 2913 return T->getStmtClass() == VAArgExprClass; 2914 } 2915 static bool classof(const VAArgExpr *) { return true; } 2916 2917 // Iterators 2918 virtual child_iterator child_begin(); 2919 virtual child_iterator child_end(); 2920}; 2921 2922/// @brief Describes an C or C++ initializer list. 2923/// 2924/// InitListExpr describes an initializer list, which can be used to 2925/// initialize objects of different types, including 2926/// struct/class/union types, arrays, and vectors. For example: 2927/// 2928/// @code 2929/// struct foo x = { 1, { 2, 3 } }; 2930/// @endcode 2931/// 2932/// Prior to semantic analysis, an initializer list will represent the 2933/// initializer list as written by the user, but will have the 2934/// placeholder type "void". This initializer list is called the 2935/// syntactic form of the initializer, and may contain C99 designated 2936/// initializers (represented as DesignatedInitExprs), initializations 2937/// of subobject members without explicit braces, and so on. Clients 2938/// interested in the original syntax of the initializer list should 2939/// use the syntactic form of the initializer list. 2940/// 2941/// After semantic analysis, the initializer list will represent the 2942/// semantic form of the initializer, where the initializations of all 2943/// subobjects are made explicit with nested InitListExpr nodes and 2944/// C99 designators have been eliminated by placing the designated 2945/// initializations into the subobject they initialize. Additionally, 2946/// any "holes" in the initialization, where no initializer has been 2947/// specified for a particular subobject, will be replaced with 2948/// implicitly-generated ImplicitValueInitExpr expressions that 2949/// value-initialize the subobjects. Note, however, that the 2950/// initializer lists may still have fewer initializers than there are 2951/// elements to initialize within the object. 2952/// 2953/// Given the semantic form of the initializer list, one can retrieve 2954/// the original syntactic form of that initializer list (if it 2955/// exists) using getSyntacticForm(). Since many initializer lists 2956/// have the same syntactic and semantic forms, getSyntacticForm() may 2957/// return NULL, indicating that the current initializer list also 2958/// serves as its syntactic form. 2959class InitListExpr : public Expr { 2960 // FIXME: Eliminate this vector in favor of ASTContext allocation 2961 typedef ASTVector<Stmt *> InitExprsTy; 2962 InitExprsTy InitExprs; 2963 SourceLocation LBraceLoc, RBraceLoc; 2964 2965 /// Contains the initializer list that describes the syntactic form 2966 /// written in the source code. 2967 InitListExpr *SyntacticForm; 2968 2969 /// If this initializer list initializes a union, specifies which 2970 /// field within the union will be initialized. 2971 FieldDecl *UnionFieldInit; 2972 2973 /// Whether this initializer list originally had a GNU array-range 2974 /// designator in it. This is a temporary marker used by CodeGen. 2975 bool HadArrayRangeDesignator; 2976 2977public: 2978 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2979 Expr **initexprs, unsigned numinits, 2980 SourceLocation rbraceloc); 2981 2982 /// \brief Build an empty initializer list. 2983 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2984 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2985 2986 unsigned getNumInits() const { return InitExprs.size(); } 2987 2988 /// \brief Retrieve the set of initializers. 2989 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 2990 2991 const Expr *getInit(unsigned Init) const { 2992 assert(Init < getNumInits() && "Initializer access out of range!"); 2993 return cast_or_null<Expr>(InitExprs[Init]); 2994 } 2995 2996 Expr *getInit(unsigned Init) { 2997 assert(Init < getNumInits() && "Initializer access out of range!"); 2998 return cast_or_null<Expr>(InitExprs[Init]); 2999 } 3000 3001 void setInit(unsigned Init, Expr *expr) { 3002 assert(Init < getNumInits() && "Initializer access out of range!"); 3003 InitExprs[Init] = expr; 3004 } 3005 3006 /// \brief Reserve space for some number of initializers. 3007 void reserveInits(ASTContext &C, unsigned NumInits); 3008 3009 /// @brief Specify the number of initializers 3010 /// 3011 /// If there are more than @p NumInits initializers, the remaining 3012 /// initializers will be destroyed. If there are fewer than @p 3013 /// NumInits initializers, NULL expressions will be added for the 3014 /// unknown initializers. 3015 void resizeInits(ASTContext &Context, unsigned NumInits); 3016 3017 /// @brief Updates the initializer at index @p Init with the new 3018 /// expression @p expr, and returns the old expression at that 3019 /// location. 3020 /// 3021 /// When @p Init is out of range for this initializer list, the 3022 /// initializer list will be extended with NULL expressions to 3023 /// accomodate the new entry. 3024 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3025 3026 /// \brief If this initializes a union, specifies which field in the 3027 /// union to initialize. 3028 /// 3029 /// Typically, this field is the first named field within the 3030 /// union. However, a designated initializer can specify the 3031 /// initialization of a different field within the union. 3032 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 3033 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 3034 3035 // Explicit InitListExpr's originate from source code (and have valid source 3036 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3037 bool isExplicit() { 3038 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3039 } 3040 3041 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3042 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3043 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3044 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3045 3046 /// @brief Retrieve the initializer list that describes the 3047 /// syntactic form of the initializer. 3048 /// 3049 /// 3050 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3051 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3052 3053 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3054 void sawArrayRangeDesignator(bool ARD = true) { 3055 HadArrayRangeDesignator = ARD; 3056 } 3057 3058 virtual SourceRange getSourceRange() const; 3059 3060 static bool classof(const Stmt *T) { 3061 return T->getStmtClass() == InitListExprClass; 3062 } 3063 static bool classof(const InitListExpr *) { return true; } 3064 3065 // Iterators 3066 virtual child_iterator child_begin(); 3067 virtual child_iterator child_end(); 3068 3069 typedef InitExprsTy::iterator iterator; 3070 typedef InitExprsTy::const_iterator const_iterator; 3071 typedef InitExprsTy::reverse_iterator reverse_iterator; 3072 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3073 3074 iterator begin() { return InitExprs.begin(); } 3075 const_iterator begin() const { return InitExprs.begin(); } 3076 iterator end() { return InitExprs.end(); } 3077 const_iterator end() const { return InitExprs.end(); } 3078 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3079 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3080 reverse_iterator rend() { return InitExprs.rend(); } 3081 const_reverse_iterator rend() const { return InitExprs.rend(); } 3082}; 3083 3084/// @brief Represents a C99 designated initializer expression. 3085/// 3086/// A designated initializer expression (C99 6.7.8) contains one or 3087/// more designators (which can be field designators, array 3088/// designators, or GNU array-range designators) followed by an 3089/// expression that initializes the field or element(s) that the 3090/// designators refer to. For example, given: 3091/// 3092/// @code 3093/// struct point { 3094/// double x; 3095/// double y; 3096/// }; 3097/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3098/// @endcode 3099/// 3100/// The InitListExpr contains three DesignatedInitExprs, the first of 3101/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3102/// designators, one array designator for @c [2] followed by one field 3103/// designator for @c .y. The initalization expression will be 1.0. 3104class DesignatedInitExpr : public Expr { 3105public: 3106 /// \brief Forward declaration of the Designator class. 3107 class Designator; 3108 3109private: 3110 /// The location of the '=' or ':' prior to the actual initializer 3111 /// expression. 3112 SourceLocation EqualOrColonLoc; 3113 3114 /// Whether this designated initializer used the GNU deprecated 3115 /// syntax rather than the C99 '=' syntax. 3116 bool GNUSyntax : 1; 3117 3118 /// The number of designators in this initializer expression. 3119 unsigned NumDesignators : 15; 3120 3121 /// \brief The designators in this designated initialization 3122 /// expression. 3123 Designator *Designators; 3124 3125 /// The number of subexpressions of this initializer expression, 3126 /// which contains both the initializer and any additional 3127 /// expressions used by array and array-range designators. 3128 unsigned NumSubExprs : 16; 3129 3130 3131 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3132 const Designator *Designators, 3133 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3134 Expr **IndexExprs, unsigned NumIndexExprs, 3135 Expr *Init); 3136 3137 explicit DesignatedInitExpr(unsigned NumSubExprs) 3138 : Expr(DesignatedInitExprClass, EmptyShell()), 3139 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3140 3141public: 3142 /// A field designator, e.g., ".x". 3143 struct FieldDesignator { 3144 /// Refers to the field that is being initialized. The low bit 3145 /// of this field determines whether this is actually a pointer 3146 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3147 /// initially constructed, a field designator will store an 3148 /// IdentifierInfo*. After semantic analysis has resolved that 3149 /// name, the field designator will instead store a FieldDecl*. 3150 uintptr_t NameOrField; 3151 3152 /// The location of the '.' in the designated initializer. 3153 unsigned DotLoc; 3154 3155 /// The location of the field name in the designated initializer. 3156 unsigned FieldLoc; 3157 }; 3158 3159 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3160 struct ArrayOrRangeDesignator { 3161 /// Location of the first index expression within the designated 3162 /// initializer expression's list of subexpressions. 3163 unsigned Index; 3164 /// The location of the '[' starting the array range designator. 3165 unsigned LBracketLoc; 3166 /// The location of the ellipsis separating the start and end 3167 /// indices. Only valid for GNU array-range designators. 3168 unsigned EllipsisLoc; 3169 /// The location of the ']' terminating the array range designator. 3170 unsigned RBracketLoc; 3171 }; 3172 3173 /// @brief Represents a single C99 designator. 3174 /// 3175 /// @todo This class is infuriatingly similar to clang::Designator, 3176 /// but minor differences (storing indices vs. storing pointers) 3177 /// keep us from reusing it. Try harder, later, to rectify these 3178 /// differences. 3179 class Designator { 3180 /// @brief The kind of designator this describes. 3181 enum { 3182 FieldDesignator, 3183 ArrayDesignator, 3184 ArrayRangeDesignator 3185 } Kind; 3186 3187 union { 3188 /// A field designator, e.g., ".x". 3189 struct FieldDesignator Field; 3190 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3191 struct ArrayOrRangeDesignator ArrayOrRange; 3192 }; 3193 friend class DesignatedInitExpr; 3194 3195 public: 3196 Designator() {} 3197 3198 /// @brief Initializes a field designator. 3199 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3200 SourceLocation FieldLoc) 3201 : Kind(FieldDesignator) { 3202 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3203 Field.DotLoc = DotLoc.getRawEncoding(); 3204 Field.FieldLoc = FieldLoc.getRawEncoding(); 3205 } 3206 3207 /// @brief Initializes an array designator. 3208 Designator(unsigned Index, SourceLocation LBracketLoc, 3209 SourceLocation RBracketLoc) 3210 : Kind(ArrayDesignator) { 3211 ArrayOrRange.Index = Index; 3212 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3213 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3214 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3215 } 3216 3217 /// @brief Initializes a GNU array-range designator. 3218 Designator(unsigned Index, SourceLocation LBracketLoc, 3219 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3220 : Kind(ArrayRangeDesignator) { 3221 ArrayOrRange.Index = Index; 3222 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3223 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3224 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3225 } 3226 3227 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3228 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3229 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3230 3231 IdentifierInfo * getFieldName(); 3232 3233 FieldDecl *getField() { 3234 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3235 if (Field.NameOrField & 0x01) 3236 return 0; 3237 else 3238 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3239 } 3240 3241 void setField(FieldDecl *FD) { 3242 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3243 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3244 } 3245 3246 SourceLocation getDotLoc() const { 3247 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3248 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3249 } 3250 3251 SourceLocation getFieldLoc() const { 3252 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3253 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3254 } 3255 3256 SourceLocation getLBracketLoc() const { 3257 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3258 "Only valid on an array or array-range designator"); 3259 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3260 } 3261 3262 SourceLocation getRBracketLoc() const { 3263 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3264 "Only valid on an array or array-range designator"); 3265 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3266 } 3267 3268 SourceLocation getEllipsisLoc() const { 3269 assert(Kind == ArrayRangeDesignator && 3270 "Only valid on an array-range designator"); 3271 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3272 } 3273 3274 unsigned getFirstExprIndex() const { 3275 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3276 "Only valid on an array or array-range designator"); 3277 return ArrayOrRange.Index; 3278 } 3279 3280 SourceLocation getStartLocation() const { 3281 if (Kind == FieldDesignator) 3282 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3283 else 3284 return getLBracketLoc(); 3285 } 3286 }; 3287 3288 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3289 unsigned NumDesignators, 3290 Expr **IndexExprs, unsigned NumIndexExprs, 3291 SourceLocation EqualOrColonLoc, 3292 bool GNUSyntax, Expr *Init); 3293 3294 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3295 3296 /// @brief Returns the number of designators in this initializer. 3297 unsigned size() const { return NumDesignators; } 3298 3299 // Iterator access to the designators. 3300 typedef Designator* designators_iterator; 3301 designators_iterator designators_begin() { return Designators; } 3302 designators_iterator designators_end() { 3303 return Designators + NumDesignators; 3304 } 3305 3306 typedef std::reverse_iterator<designators_iterator> 3307 reverse_designators_iterator; 3308 reverse_designators_iterator designators_rbegin() { 3309 return reverse_designators_iterator(designators_end()); 3310 } 3311 reverse_designators_iterator designators_rend() { 3312 return reverse_designators_iterator(designators_begin()); 3313 } 3314 3315 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3316 3317 void setDesignators(ASTContext &C, const Designator *Desigs, 3318 unsigned NumDesigs); 3319 3320 Expr *getArrayIndex(const Designator& D); 3321 Expr *getArrayRangeStart(const Designator& D); 3322 Expr *getArrayRangeEnd(const Designator& D); 3323 3324 /// @brief Retrieve the location of the '=' that precedes the 3325 /// initializer value itself, if present. 3326 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3327 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3328 3329 /// @brief Determines whether this designated initializer used the 3330 /// deprecated GNU syntax for designated initializers. 3331 bool usesGNUSyntax() const { return GNUSyntax; } 3332 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3333 3334 /// @brief Retrieve the initializer value. 3335 Expr *getInit() const { 3336 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3337 } 3338 3339 void setInit(Expr *init) { 3340 *child_begin() = init; 3341 } 3342 3343 /// \brief Retrieve the total number of subexpressions in this 3344 /// designated initializer expression, including the actual 3345 /// initialized value and any expressions that occur within array 3346 /// and array-range designators. 3347 unsigned getNumSubExprs() const { return NumSubExprs; } 3348 3349 Expr *getSubExpr(unsigned Idx) { 3350 assert(Idx < NumSubExprs && "Subscript out of range"); 3351 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3352 Ptr += sizeof(DesignatedInitExpr); 3353 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3354 } 3355 3356 void setSubExpr(unsigned Idx, Expr *E) { 3357 assert(Idx < NumSubExprs && "Subscript out of range"); 3358 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3359 Ptr += sizeof(DesignatedInitExpr); 3360 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3361 } 3362 3363 /// \brief Replaces the designator at index @p Idx with the series 3364 /// of designators in [First, Last). 3365 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3366 const Designator *Last); 3367 3368 virtual SourceRange getSourceRange() const; 3369 3370 static bool classof(const Stmt *T) { 3371 return T->getStmtClass() == DesignatedInitExprClass; 3372 } 3373 static bool classof(const DesignatedInitExpr *) { return true; } 3374 3375 // Iterators 3376 virtual child_iterator child_begin(); 3377 virtual child_iterator child_end(); 3378}; 3379 3380/// \brief Represents an implicitly-generated value initialization of 3381/// an object of a given type. 3382/// 3383/// Implicit value initializations occur within semantic initializer 3384/// list expressions (InitListExpr) as placeholders for subobject 3385/// initializations not explicitly specified by the user. 3386/// 3387/// \see InitListExpr 3388class ImplicitValueInitExpr : public Expr { 3389public: 3390 explicit ImplicitValueInitExpr(QualType ty) 3391 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3392 false, false, false) { } 3393 3394 /// \brief Construct an empty implicit value initialization. 3395 explicit ImplicitValueInitExpr(EmptyShell Empty) 3396 : Expr(ImplicitValueInitExprClass, Empty) { } 3397 3398 static bool classof(const Stmt *T) { 3399 return T->getStmtClass() == ImplicitValueInitExprClass; 3400 } 3401 static bool classof(const ImplicitValueInitExpr *) { return true; } 3402 3403 virtual SourceRange getSourceRange() const { 3404 return SourceRange(); 3405 } 3406 3407 // Iterators 3408 virtual child_iterator child_begin(); 3409 virtual child_iterator child_end(); 3410}; 3411 3412 3413class ParenListExpr : public Expr { 3414 Stmt **Exprs; 3415 unsigned NumExprs; 3416 SourceLocation LParenLoc, RParenLoc; 3417 3418public: 3419 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3420 unsigned numexprs, SourceLocation rparenloc); 3421 3422 /// \brief Build an empty paren list. 3423 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3424 3425 unsigned getNumExprs() const { return NumExprs; } 3426 3427 const Expr* getExpr(unsigned Init) const { 3428 assert(Init < getNumExprs() && "Initializer access out of range!"); 3429 return cast_or_null<Expr>(Exprs[Init]); 3430 } 3431 3432 Expr* getExpr(unsigned Init) { 3433 assert(Init < getNumExprs() && "Initializer access out of range!"); 3434 return cast_or_null<Expr>(Exprs[Init]); 3435 } 3436 3437 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3438 3439 SourceLocation getLParenLoc() const { return LParenLoc; } 3440 SourceLocation getRParenLoc() const { return RParenLoc; } 3441 3442 virtual SourceRange getSourceRange() const { 3443 return SourceRange(LParenLoc, RParenLoc); 3444 } 3445 static bool classof(const Stmt *T) { 3446 return T->getStmtClass() == ParenListExprClass; 3447 } 3448 static bool classof(const ParenListExpr *) { return true; } 3449 3450 // Iterators 3451 virtual child_iterator child_begin(); 3452 virtual child_iterator child_end(); 3453 3454 friend class ASTStmtReader; 3455 friend class ASTStmtWriter; 3456}; 3457 3458 3459//===----------------------------------------------------------------------===// 3460// Clang Extensions 3461//===----------------------------------------------------------------------===// 3462 3463 3464/// ExtVectorElementExpr - This represents access to specific elements of a 3465/// vector, and may occur on the left hand side or right hand side. For example 3466/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3467/// 3468/// Note that the base may have either vector or pointer to vector type, just 3469/// like a struct field reference. 3470/// 3471class ExtVectorElementExpr : public Expr { 3472 Stmt *Base; 3473 IdentifierInfo *Accessor; 3474 SourceLocation AccessorLoc; 3475public: 3476 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3477 IdentifierInfo &accessor, SourceLocation loc) 3478 : Expr(ExtVectorElementExprClass, ty, VK, 3479 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3480 base->isTypeDependent(), base->isValueDependent(), 3481 base->containsUnexpandedParameterPack()), 3482 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3483 3484 /// \brief Build an empty vector element expression. 3485 explicit ExtVectorElementExpr(EmptyShell Empty) 3486 : Expr(ExtVectorElementExprClass, Empty) { } 3487 3488 const Expr *getBase() const { return cast<Expr>(Base); } 3489 Expr *getBase() { return cast<Expr>(Base); } 3490 void setBase(Expr *E) { Base = E; } 3491 3492 IdentifierInfo &getAccessor() const { return *Accessor; } 3493 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3494 3495 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3496 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3497 3498 /// getNumElements - Get the number of components being selected. 3499 unsigned getNumElements() const; 3500 3501 /// containsDuplicateElements - Return true if any element access is 3502 /// repeated. 3503 bool containsDuplicateElements() const; 3504 3505 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3506 /// aggregate Constant of ConstantInt(s). 3507 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3508 3509 virtual SourceRange getSourceRange() const { 3510 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3511 } 3512 3513 /// isArrow - Return true if the base expression is a pointer to vector, 3514 /// return false if the base expression is a vector. 3515 bool isArrow() const; 3516 3517 static bool classof(const Stmt *T) { 3518 return T->getStmtClass() == ExtVectorElementExprClass; 3519 } 3520 static bool classof(const ExtVectorElementExpr *) { return true; } 3521 3522 // Iterators 3523 virtual child_iterator child_begin(); 3524 virtual child_iterator child_end(); 3525}; 3526 3527 3528/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3529/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3530class BlockExpr : public Expr { 3531protected: 3532 BlockDecl *TheBlock; 3533public: 3534 BlockExpr(BlockDecl *BD, QualType ty) 3535 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3536 ty->isDependentType(), false, false), 3537 TheBlock(BD) {} 3538 3539 /// \brief Build an empty block expression. 3540 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3541 3542 const BlockDecl *getBlockDecl() const { return TheBlock; } 3543 BlockDecl *getBlockDecl() { return TheBlock; } 3544 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3545 3546 // Convenience functions for probing the underlying BlockDecl. 3547 SourceLocation getCaretLocation() const; 3548 const Stmt *getBody() const; 3549 Stmt *getBody(); 3550 3551 virtual SourceRange getSourceRange() const { 3552 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3553 } 3554 3555 /// getFunctionType - Return the underlying function type for this block. 3556 const FunctionType *getFunctionType() const; 3557 3558 static bool classof(const Stmt *T) { 3559 return T->getStmtClass() == BlockExprClass; 3560 } 3561 static bool classof(const BlockExpr *) { return true; } 3562 3563 // Iterators 3564 virtual child_iterator child_begin(); 3565 virtual child_iterator child_end(); 3566}; 3567 3568/// BlockDeclRefExpr - A reference to a local variable declared in an 3569/// enclosing scope. 3570class BlockDeclRefExpr : public Expr { 3571 VarDecl *D; 3572 SourceLocation Loc; 3573 bool IsByRef : 1; 3574 bool ConstQualAdded : 1; 3575public: 3576 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3577 SourceLocation l, bool ByRef, bool constAdded = false); 3578 3579 // \brief Build an empty reference to a declared variable in a 3580 // block. 3581 explicit BlockDeclRefExpr(EmptyShell Empty) 3582 : Expr(BlockDeclRefExprClass, Empty) { } 3583 3584 VarDecl *getDecl() { return D; } 3585 const VarDecl *getDecl() const { return D; } 3586 void setDecl(VarDecl *VD) { D = VD; } 3587 3588 SourceLocation getLocation() const { return Loc; } 3589 void setLocation(SourceLocation L) { Loc = L; } 3590 3591 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3592 3593 bool isByRef() const { return IsByRef; } 3594 void setByRef(bool BR) { IsByRef = BR; } 3595 3596 bool isConstQualAdded() const { return ConstQualAdded; } 3597 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3598 3599 static bool classof(const Stmt *T) { 3600 return T->getStmtClass() == BlockDeclRefExprClass; 3601 } 3602 static bool classof(const BlockDeclRefExpr *) { return true; } 3603 3604 // Iterators 3605 virtual child_iterator child_begin(); 3606 virtual child_iterator child_end(); 3607}; 3608 3609/// OpaqueValueExpr - An expression referring to an opaque object of a 3610/// fixed type and value class. These don't correspond to concrete 3611/// syntax; instead they're used to express operations (usually copy 3612/// operations) on values whose source is generally obvious from 3613/// context. 3614class OpaqueValueExpr : public Expr { 3615 friend class ASTStmtReader; 3616 SourceLocation Loc; 3617 3618public: 3619 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 3620 ExprObjectKind OK = OK_Ordinary) 3621 : Expr(OpaqueValueExprClass, T, VK, OK, 3622 T->isDependentType(), T->isDependentType(), false), 3623 Loc(Loc) { 3624 } 3625 3626 explicit OpaqueValueExpr(EmptyShell Empty) 3627 : Expr(OpaqueValueExprClass, Empty) { } 3628 3629 /// \brief Retrieve the location of this expression. 3630 SourceLocation getLocation() const { return Loc; } 3631 3632 virtual SourceRange getSourceRange() const; 3633 virtual child_iterator child_begin(); 3634 virtual child_iterator child_end(); 3635 3636 static bool classof(const Stmt *T) { 3637 return T->getStmtClass() == OpaqueValueExprClass; 3638 } 3639 static bool classof(const OpaqueValueExpr *) { return true; } 3640}; 3641 3642} // end namespace clang 3643 3644#endif 3645