Expr.h revision 4ba2a17694148e16eaa8d3917f657ffcd3667be4
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 Classify - Classify this expression according to the C++0x 273 /// expression taxonomy. 274 /// 275 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 276 /// old lvalue vs rvalue. This function determines the type of expression this 277 /// is. There are three expression types: 278 /// - lvalues are classical lvalues as in C++03. 279 /// - prvalues are equivalent to rvalues in C++03. 280 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 281 /// function returning an rvalue reference. 282 /// lvalues and xvalues are collectively referred to as glvalues, while 283 /// prvalues and xvalues together form rvalues. 284 Classification Classify(ASTContext &Ctx) const { 285 return ClassifyImpl(Ctx, 0); 286 } 287 288 /// \brief ClassifyModifiable - Classify this expression according to the 289 /// C++0x expression taxonomy, and see if it is valid on the left side 290 /// of an assignment. 291 /// 292 /// This function extends classify in that it also tests whether the 293 /// expression is modifiable (C99 6.3.2.1p1). 294 /// \param Loc A source location that might be filled with a relevant location 295 /// if the expression is not modifiable. 296 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 297 return ClassifyImpl(Ctx, &Loc); 298 } 299 300 /// getValueKindForType - Given a formal return or parameter type, 301 /// give its value kind. 302 static ExprValueKind getValueKindForType(QualType T) { 303 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 304 return (isa<LValueReferenceType>(RT) 305 ? VK_LValue 306 : (RT->getPointeeType()->isFunctionType() 307 ? VK_LValue : VK_XValue)); 308 return VK_RValue; 309 } 310 311 /// getValueKind - The value kind that this expression produces. 312 ExprValueKind getValueKind() const { 313 return static_cast<ExprValueKind>(ExprBits.ValueKind); 314 } 315 316 /// getObjectKind - The object kind that this expression produces. 317 /// Object kinds are meaningful only for expressions that yield an 318 /// l-value or x-value. 319 ExprObjectKind getObjectKind() const { 320 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 321 } 322 323 /// setValueKind - Set the value kind produced by this expression. 324 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 325 326 /// setObjectKind - Set the object kind produced by this expression. 327 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 328 329private: 330 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 331 332public: 333 334 /// \brief If this expression refers to a bit-field, retrieve the 335 /// declaration of that bit-field. 336 FieldDecl *getBitField(); 337 338 const FieldDecl *getBitField() const { 339 return const_cast<Expr*>(this)->getBitField(); 340 } 341 342 /// \brief If this expression is an l-value for an Objective C 343 /// property, find the underlying property reference expression. 344 const ObjCPropertyRefExpr *getObjCProperty() const; 345 346 /// \brief Returns whether this expression refers to a vector element. 347 bool refersToVectorElement() const; 348 349 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 350 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 351 /// but also int expressions which are produced by things like comparisons in 352 /// C. 353 bool isKnownToHaveBooleanValue() const; 354 355 /// isIntegerConstantExpr - Return true if this expression is a valid integer 356 /// constant expression, and, if so, return its value in Result. If not a 357 /// valid i-c-e, return false and fill in Loc (if specified) with the location 358 /// of the invalid expression. 359 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 360 SourceLocation *Loc = 0, 361 bool isEvaluated = true) const; 362 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 363 llvm::APSInt X; 364 return isIntegerConstantExpr(X, Ctx, Loc); 365 } 366 /// isConstantInitializer - Returns true if this expression is a constant 367 /// initializer, which can be emitted at compile-time. 368 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 369 370 /// EvalResult is a struct with detailed info about an evaluated expression. 371 struct EvalResult { 372 /// Val - This is the value the expression can be folded to. 373 APValue Val; 374 375 /// HasSideEffects - Whether the evaluated expression has side effects. 376 /// For example, (f() && 0) can be folded, but it still has side effects. 377 bool HasSideEffects; 378 379 /// Diag - If the expression is unfoldable, then Diag contains a note 380 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 381 /// position for the error, and DiagExpr is the expression that caused 382 /// the error. 383 /// If the expression is foldable, but not an integer constant expression, 384 /// Diag contains a note diagnostic that describes why it isn't an integer 385 /// constant expression. If the expression *is* an integer constant 386 /// expression, then Diag will be zero. 387 unsigned Diag; 388 const Expr *DiagExpr; 389 SourceLocation DiagLoc; 390 391 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 392 393 // isGlobalLValue - Return true if the evaluated lvalue expression 394 // is global. 395 bool isGlobalLValue() const; 396 // hasSideEffects - Return true if the evaluated expression has 397 // side effects. 398 bool hasSideEffects() const { 399 return HasSideEffects; 400 } 401 }; 402 403 /// Evaluate - Return true if this is a constant which we can fold using 404 /// any crazy technique (that has nothing to do with language standards) that 405 /// we want to. If this function returns true, it returns the folded constant 406 /// in Result. 407 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 408 409 /// EvaluateAsBooleanCondition - Return true if this is a constant 410 /// which we we can fold and convert to a boolean condition using 411 /// any crazy technique that we want to. 412 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 413 414 /// isEvaluatable - Call Evaluate to see if this expression can be constant 415 /// folded, but discard the result. 416 bool isEvaluatable(const ASTContext &Ctx) const; 417 418 /// HasSideEffects - This routine returns true for all those expressions 419 /// which must be evaluated each time and must not be optimized away 420 /// or evaluated at compile time. Example is a function call, volatile 421 /// variable read. 422 bool HasSideEffects(const ASTContext &Ctx) const; 423 424 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 425 /// must be called on an expression that constant folds to an integer. 426 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 427 428 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 429 /// with link time known address. 430 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 431 432 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 433 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 434 435 /// \brief Enumeration used to describe how \c isNullPointerConstant() 436 /// should cope with value-dependent expressions. 437 enum NullPointerConstantValueDependence { 438 /// \brief Specifies that the expression should never be value-dependent. 439 NPC_NeverValueDependent = 0, 440 441 /// \brief Specifies that a value-dependent expression of integral or 442 /// dependent type should be considered a null pointer constant. 443 NPC_ValueDependentIsNull, 444 445 /// \brief Specifies that a value-dependent expression should be considered 446 /// to never be a null pointer constant. 447 NPC_ValueDependentIsNotNull 448 }; 449 450 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 451 /// integer constant expression with the value zero, or if this is one that is 452 /// cast to void*. 453 bool isNullPointerConstant(ASTContext &Ctx, 454 NullPointerConstantValueDependence NPC) const; 455 456 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 457 /// write barrier. 458 bool isOBJCGCCandidate(ASTContext &Ctx) const; 459 460 /// \brief Returns true if this expression is a bound member function. 461 bool isBoundMemberFunction(ASTContext &Ctx) const; 462 463 /// \brief Result type of CanThrow(). 464 enum CanThrowResult { 465 CT_Cannot, 466 CT_Dependent, 467 CT_Can 468 }; 469 /// \brief Test if this expression, if evaluated, might throw, according to 470 /// the rules of C++ [expr.unary.noexcept]. 471 CanThrowResult CanThrow(ASTContext &C) const; 472 473 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 474 /// its subexpression. If that subexpression is also a ParenExpr, 475 /// then this method recursively returns its subexpression, and so forth. 476 /// Otherwise, the method returns the current Expr. 477 Expr *IgnoreParens(); 478 479 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 480 /// or CastExprs, returning their operand. 481 Expr *IgnoreParenCasts(); 482 483 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 484 /// ParenExpr or ImplicitCastExprs, returning their operand. 485 Expr *IgnoreParenImpCasts(); 486 487 const Expr *IgnoreParenImpCasts() const { 488 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 489 } 490 491 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 492 /// CastExprs that represent lvalue casts, returning their operand. 493 Expr *IgnoreParenLValueCasts(); 494 495 const Expr *IgnoreParenLValueCasts() const { 496 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 497 } 498 499 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 500 /// value (including ptr->int casts of the same size). Strip off any 501 /// ParenExpr or CastExprs, returning their operand. 502 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 503 504 /// \brief Determine whether this expression is a default function argument. 505 /// 506 /// Default arguments are implicitly generated in the abstract syntax tree 507 /// by semantic analysis for function calls, object constructions, etc. in 508 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 509 /// this routine also looks through any implicit casts to determine whether 510 /// the expression is a default argument. 511 bool isDefaultArgument() const; 512 513 /// \brief Determine whether the result of this expression is a 514 /// temporary object of the given class type. 515 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 516 517 const Expr *IgnoreParens() const { 518 return const_cast<Expr*>(this)->IgnoreParens(); 519 } 520 const Expr *IgnoreParenCasts() const { 521 return const_cast<Expr*>(this)->IgnoreParenCasts(); 522 } 523 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 524 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 525 } 526 527 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 528 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 529 530 static bool classof(const Stmt *T) { 531 return T->getStmtClass() >= firstExprConstant && 532 T->getStmtClass() <= lastExprConstant; 533 } 534 static bool classof(const Expr *) { return true; } 535}; 536 537 538//===----------------------------------------------------------------------===// 539// Primary Expressions. 540//===----------------------------------------------------------------------===// 541 542/// \brief Represents the qualifier that may precede a C++ name, e.g., the 543/// "std::" in "std::sort". 544struct NameQualifier { 545 /// \brief The nested name specifier. 546 NestedNameSpecifier *NNS; 547 548 /// \brief The source range covered by the nested name specifier. 549 SourceRange Range; 550}; 551 552/// \brief Represents an explicit template argument list in C++, e.g., 553/// the "<int>" in "sort<int>". 554struct ExplicitTemplateArgumentList { 555 /// \brief The source location of the left angle bracket ('<'); 556 SourceLocation LAngleLoc; 557 558 /// \brief The source location of the right angle bracket ('>'); 559 SourceLocation RAngleLoc; 560 561 /// \brief The number of template arguments in TemplateArgs. 562 /// The actual template arguments (if any) are stored after the 563 /// ExplicitTemplateArgumentList structure. 564 unsigned NumTemplateArgs; 565 566 /// \brief Retrieve the template arguments 567 TemplateArgumentLoc *getTemplateArgs() { 568 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 569 } 570 571 /// \brief Retrieve the template arguments 572 const TemplateArgumentLoc *getTemplateArgs() const { 573 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 574 } 575 576 void initializeFrom(const TemplateArgumentListInfo &List); 577 void initializeFrom(const TemplateArgumentListInfo &List, 578 bool &Dependent, bool &ContainsUnexpandedParameterPack); 579 void copyInto(TemplateArgumentListInfo &List) const; 580 static std::size_t sizeFor(unsigned NumTemplateArgs); 581 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 582}; 583 584/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 585/// enum, etc. 586class DeclRefExpr : public Expr { 587 enum { 588 // Flag on DecoratedD that specifies when this declaration reference 589 // expression has a C++ nested-name-specifier. 590 HasQualifierFlag = 0x01, 591 // Flag on DecoratedD that specifies when this declaration reference 592 // expression has an explicit C++ template argument list. 593 HasExplicitTemplateArgumentListFlag = 0x02 594 }; 595 596 // DecoratedD - The declaration that we are referencing, plus two bits to 597 // indicate whether (1) the declaration's name was explicitly qualified and 598 // (2) the declaration's name was followed by an explicit template 599 // argument list. 600 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 601 602 // Loc - The location of the declaration name itself. 603 SourceLocation Loc; 604 605 /// DNLoc - Provides source/type location info for the 606 /// declaration name embedded in DecoratedD. 607 DeclarationNameLoc DNLoc; 608 609 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 610 NameQualifier *getNameQualifier() { 611 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 612 return 0; 613 614 return reinterpret_cast<NameQualifier *> (this + 1); 615 } 616 617 /// \brief Retrieve the qualifier that preceded the member name, if any. 618 const NameQualifier *getNameQualifier() const { 619 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 620 } 621 622 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 623 ValueDecl *D, SourceLocation NameLoc, 624 const TemplateArgumentListInfo *TemplateArgs, 625 QualType T, ExprValueKind VK); 626 627 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 628 ValueDecl *D, const DeclarationNameInfo &NameInfo, 629 const TemplateArgumentListInfo *TemplateArgs, 630 QualType T, ExprValueKind VK); 631 632 /// \brief Construct an empty declaration reference expression. 633 explicit DeclRefExpr(EmptyShell Empty) 634 : Expr(DeclRefExprClass, Empty) { } 635 636 /// \brief Computes the type- and value-dependence flags for this 637 /// declaration reference expression. 638 void computeDependence(); 639 640public: 641 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 642 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 643 DecoratedD(d, 0), Loc(l) { 644 computeDependence(); 645 } 646 647 static DeclRefExpr *Create(ASTContext &Context, 648 NestedNameSpecifier *Qualifier, 649 SourceRange QualifierRange, 650 ValueDecl *D, 651 SourceLocation NameLoc, 652 QualType T, ExprValueKind VK, 653 const TemplateArgumentListInfo *TemplateArgs = 0); 654 655 static DeclRefExpr *Create(ASTContext &Context, 656 NestedNameSpecifier *Qualifier, 657 SourceRange QualifierRange, 658 ValueDecl *D, 659 const DeclarationNameInfo &NameInfo, 660 QualType T, ExprValueKind VK, 661 const TemplateArgumentListInfo *TemplateArgs = 0); 662 663 /// \brief Construct an empty declaration reference expression. 664 static DeclRefExpr *CreateEmpty(ASTContext &Context, 665 bool HasQualifier, unsigned NumTemplateArgs); 666 667 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 668 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 669 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 670 671 DeclarationNameInfo getNameInfo() const { 672 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 673 } 674 675 SourceLocation getLocation() const { return Loc; } 676 void setLocation(SourceLocation L) { Loc = L; } 677 virtual SourceRange getSourceRange() const; 678 679 /// \brief Determine whether this declaration reference was preceded by a 680 /// C++ nested-name-specifier, e.g., \c N::foo. 681 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 682 683 /// \brief If the name was qualified, retrieves the source range of 684 /// the nested-name-specifier that precedes the name. Otherwise, 685 /// returns an empty source range. 686 SourceRange getQualifierRange() const { 687 if (!hasQualifier()) 688 return SourceRange(); 689 690 return getNameQualifier()->Range; 691 } 692 693 /// \brief If the name was qualified, retrieves the nested-name-specifier 694 /// that precedes the name. Otherwise, returns NULL. 695 NestedNameSpecifier *getQualifier() const { 696 if (!hasQualifier()) 697 return 0; 698 699 return getNameQualifier()->NNS; 700 } 701 702 bool hasExplicitTemplateArgs() const { 703 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 704 } 705 706 /// \brief Retrieve the explicit template argument list that followed the 707 /// member template name. 708 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 709 assert(hasExplicitTemplateArgs()); 710 711 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 712 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 713 714 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 715 getNameQualifier() + 1); 716 } 717 718 /// \brief Retrieve the explicit template argument list that followed the 719 /// member template name. 720 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 721 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 722 } 723 724 /// \brief Retrieves the optional explicit template arguments. 725 /// This points to the same data as getExplicitTemplateArgs(), but 726 /// returns null if there are no explicit template arguments. 727 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 728 if (!hasExplicitTemplateArgs()) return 0; 729 return &getExplicitTemplateArgs(); 730 } 731 732 /// \brief Copies the template arguments (if present) into the given 733 /// structure. 734 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 735 if (hasExplicitTemplateArgs()) 736 getExplicitTemplateArgs().copyInto(List); 737 } 738 739 /// \brief Retrieve the location of the left angle bracket following the 740 /// member name ('<'), if any. 741 SourceLocation getLAngleLoc() const { 742 if (!hasExplicitTemplateArgs()) 743 return SourceLocation(); 744 745 return getExplicitTemplateArgs().LAngleLoc; 746 } 747 748 /// \brief Retrieve the template arguments provided as part of this 749 /// template-id. 750 const TemplateArgumentLoc *getTemplateArgs() const { 751 if (!hasExplicitTemplateArgs()) 752 return 0; 753 754 return getExplicitTemplateArgs().getTemplateArgs(); 755 } 756 757 /// \brief Retrieve the number of template arguments provided as part of this 758 /// template-id. 759 unsigned getNumTemplateArgs() const { 760 if (!hasExplicitTemplateArgs()) 761 return 0; 762 763 return getExplicitTemplateArgs().NumTemplateArgs; 764 } 765 766 /// \brief Retrieve the location of the right angle bracket following the 767 /// template arguments ('>'). 768 SourceLocation getRAngleLoc() const { 769 if (!hasExplicitTemplateArgs()) 770 return SourceLocation(); 771 772 return getExplicitTemplateArgs().RAngleLoc; 773 } 774 775 static bool classof(const Stmt *T) { 776 return T->getStmtClass() == DeclRefExprClass; 777 } 778 static bool classof(const DeclRefExpr *) { return true; } 779 780 // Iterators 781 virtual child_iterator child_begin(); 782 virtual child_iterator child_end(); 783 784 friend class ASTStmtReader; 785 friend class ASTStmtWriter; 786}; 787 788/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 789class PredefinedExpr : public Expr { 790public: 791 enum IdentType { 792 Func, 793 Function, 794 PrettyFunction, 795 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 796 /// 'virtual' keyword is omitted for virtual member functions. 797 PrettyFunctionNoVirtual 798 }; 799 800private: 801 SourceLocation Loc; 802 IdentType Type; 803public: 804 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 805 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 806 type->isDependentType(), type->isDependentType(), 807 /*ContainsUnexpandedParameterPack=*/false), 808 Loc(l), Type(IT) {} 809 810 /// \brief Construct an empty predefined expression. 811 explicit PredefinedExpr(EmptyShell Empty) 812 : Expr(PredefinedExprClass, Empty) { } 813 814 IdentType getIdentType() const { return Type; } 815 void setIdentType(IdentType IT) { Type = IT; } 816 817 SourceLocation getLocation() const { return Loc; } 818 void setLocation(SourceLocation L) { Loc = L; } 819 820 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 821 822 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 823 824 static bool classof(const Stmt *T) { 825 return T->getStmtClass() == PredefinedExprClass; 826 } 827 static bool classof(const PredefinedExpr *) { return true; } 828 829 // Iterators 830 virtual child_iterator child_begin(); 831 virtual child_iterator child_end(); 832}; 833 834/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 835/// leaking memory. 836/// 837/// For large floats/integers, APFloat/APInt will allocate memory from the heap 838/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 839/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 840/// the APFloat/APInt values will never get freed. APNumericStorage uses 841/// ASTContext's allocator for memory allocation. 842class APNumericStorage { 843 unsigned BitWidth; 844 union { 845 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 846 uint64_t *pVal; ///< Used to store the >64 bits integer value. 847 }; 848 849 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 850 851 APNumericStorage(const APNumericStorage&); // do not implement 852 APNumericStorage& operator=(const APNumericStorage&); // do not implement 853 854protected: 855 APNumericStorage() : BitWidth(0), VAL(0) { } 856 857 llvm::APInt getIntValue() const { 858 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 859 if (NumWords > 1) 860 return llvm::APInt(BitWidth, NumWords, pVal); 861 else 862 return llvm::APInt(BitWidth, VAL); 863 } 864 void setIntValue(ASTContext &C, const llvm::APInt &Val); 865}; 866 867class APIntStorage : public APNumericStorage { 868public: 869 llvm::APInt getValue() const { return getIntValue(); } 870 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 871}; 872 873class APFloatStorage : public APNumericStorage { 874public: 875 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 876 void setValue(ASTContext &C, const llvm::APFloat &Val) { 877 setIntValue(C, Val.bitcastToAPInt()); 878 } 879}; 880 881class IntegerLiteral : public Expr { 882 APIntStorage Num; 883 SourceLocation Loc; 884 885 /// \brief Construct an empty integer literal. 886 explicit IntegerLiteral(EmptyShell Empty) 887 : Expr(IntegerLiteralClass, Empty) { } 888 889public: 890 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 891 // or UnsignedLongLongTy 892 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 893 QualType type, SourceLocation l) 894 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 895 false), 896 Loc(l) { 897 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 898 setValue(C, V); 899 } 900 901 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 902 // or UnsignedLongLongTy 903 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 904 QualType type, SourceLocation l); 905 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 906 907 llvm::APInt getValue() const { return Num.getValue(); } 908 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 909 910 /// \brief Retrieve the location of the literal. 911 SourceLocation getLocation() const { return Loc; } 912 913 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 914 void setLocation(SourceLocation Location) { Loc = Location; } 915 916 static bool classof(const Stmt *T) { 917 return T->getStmtClass() == IntegerLiteralClass; 918 } 919 static bool classof(const IntegerLiteral *) { return true; } 920 921 // Iterators 922 virtual child_iterator child_begin(); 923 virtual child_iterator child_end(); 924}; 925 926class CharacterLiteral : public Expr { 927 unsigned Value; 928 SourceLocation Loc; 929 bool IsWide; 930public: 931 // type should be IntTy 932 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 933 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 934 false), 935 Value(value), Loc(l), IsWide(iswide) { 936 } 937 938 /// \brief Construct an empty character literal. 939 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 940 941 SourceLocation getLocation() const { return Loc; } 942 bool isWide() const { return IsWide; } 943 944 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 945 946 unsigned getValue() const { return Value; } 947 948 void setLocation(SourceLocation Location) { Loc = Location; } 949 void setWide(bool W) { IsWide = W; } 950 void setValue(unsigned Val) { Value = Val; } 951 952 static bool classof(const Stmt *T) { 953 return T->getStmtClass() == CharacterLiteralClass; 954 } 955 static bool classof(const CharacterLiteral *) { return true; } 956 957 // Iterators 958 virtual child_iterator child_begin(); 959 virtual child_iterator child_end(); 960}; 961 962class FloatingLiteral : public Expr { 963 APFloatStorage Num; 964 bool IsExact : 1; 965 SourceLocation Loc; 966 967 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 968 QualType Type, SourceLocation L) 969 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 970 false), 971 IsExact(isexact), Loc(L) { 972 setValue(C, V); 973 } 974 975 /// \brief Construct an empty floating-point literal. 976 explicit FloatingLiteral(EmptyShell Empty) 977 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 978 979public: 980 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 981 bool isexact, QualType Type, SourceLocation L); 982 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 983 984 llvm::APFloat getValue() const { return Num.getValue(); } 985 void setValue(ASTContext &C, const llvm::APFloat &Val) { 986 Num.setValue(C, Val); 987 } 988 989 bool isExact() const { return IsExact; } 990 void setExact(bool E) { IsExact = E; } 991 992 /// getValueAsApproximateDouble - This returns the value as an inaccurate 993 /// double. Note that this may cause loss of precision, but is useful for 994 /// debugging dumps, etc. 995 double getValueAsApproximateDouble() const; 996 997 SourceLocation getLocation() const { return Loc; } 998 void setLocation(SourceLocation L) { Loc = L; } 999 1000 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 1001 1002 static bool classof(const Stmt *T) { 1003 return T->getStmtClass() == FloatingLiteralClass; 1004 } 1005 static bool classof(const FloatingLiteral *) { return true; } 1006 1007 // Iterators 1008 virtual child_iterator child_begin(); 1009 virtual child_iterator child_end(); 1010}; 1011 1012/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1013/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1014/// IntegerLiteral classes. Instances of this class always have a Complex type 1015/// whose element type matches the subexpression. 1016/// 1017class ImaginaryLiteral : public Expr { 1018 Stmt *Val; 1019public: 1020 ImaginaryLiteral(Expr *val, QualType Ty) 1021 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1022 false), 1023 Val(val) {} 1024 1025 /// \brief Build an empty imaginary literal. 1026 explicit ImaginaryLiteral(EmptyShell Empty) 1027 : Expr(ImaginaryLiteralClass, Empty) { } 1028 1029 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1030 Expr *getSubExpr() { return cast<Expr>(Val); } 1031 void setSubExpr(Expr *E) { Val = E; } 1032 1033 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 1034 static bool classof(const Stmt *T) { 1035 return T->getStmtClass() == ImaginaryLiteralClass; 1036 } 1037 static bool classof(const ImaginaryLiteral *) { return true; } 1038 1039 // Iterators 1040 virtual child_iterator child_begin(); 1041 virtual child_iterator child_end(); 1042}; 1043 1044/// StringLiteral - This represents a string literal expression, e.g. "foo" 1045/// or L"bar" (wide strings). The actual string is returned by getStrData() 1046/// is NOT null-terminated, and the length of the string is determined by 1047/// calling getByteLength(). The C type for a string is always a 1048/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1049/// not. 1050/// 1051/// Note that strings in C can be formed by concatenation of multiple string 1052/// literal pptokens in translation phase #6. This keeps track of the locations 1053/// of each of these pieces. 1054/// 1055/// Strings in C can also be truncated and extended by assigning into arrays, 1056/// e.g. with constructs like: 1057/// char X[2] = "foobar"; 1058/// In this case, getByteLength() will return 6, but the string literal will 1059/// have type "char[2]". 1060class StringLiteral : public Expr { 1061 const char *StrData; 1062 unsigned ByteLength; 1063 bool IsWide; 1064 unsigned NumConcatenated; 1065 SourceLocation TokLocs[1]; 1066 1067 StringLiteral(QualType Ty) : 1068 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1069 1070public: 1071 /// This is the "fully general" constructor that allows representation of 1072 /// strings formed from multiple concatenated tokens. 1073 static StringLiteral *Create(ASTContext &C, const char *StrData, 1074 unsigned ByteLength, bool Wide, QualType Ty, 1075 const SourceLocation *Loc, unsigned NumStrs); 1076 1077 /// Simple constructor for string literals made from one token. 1078 static StringLiteral *Create(ASTContext &C, const char *StrData, 1079 unsigned ByteLength, 1080 bool Wide, QualType Ty, SourceLocation Loc) { 1081 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1082 } 1083 1084 /// \brief Construct an empty string literal. 1085 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1086 1087 llvm::StringRef getString() const { 1088 return llvm::StringRef(StrData, ByteLength); 1089 } 1090 1091 unsigned getByteLength() const { return ByteLength; } 1092 1093 /// \brief Sets the string data to the given string data. 1094 void setString(ASTContext &C, llvm::StringRef Str); 1095 1096 bool isWide() const { return IsWide; } 1097 void setWide(bool W) { IsWide = W; } 1098 1099 bool containsNonAsciiOrNull() const { 1100 llvm::StringRef Str = getString(); 1101 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1102 if (!isascii(Str[i]) || !Str[i]) 1103 return true; 1104 return false; 1105 } 1106 /// getNumConcatenated - Get the number of string literal tokens that were 1107 /// concatenated in translation phase #6 to form this string literal. 1108 unsigned getNumConcatenated() const { return NumConcatenated; } 1109 1110 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1111 assert(TokNum < NumConcatenated && "Invalid tok number"); 1112 return TokLocs[TokNum]; 1113 } 1114 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1115 assert(TokNum < NumConcatenated && "Invalid tok number"); 1116 TokLocs[TokNum] = L; 1117 } 1118 1119 /// getLocationOfByte - Return a source location that points to the specified 1120 /// byte of this string literal. 1121 /// 1122 /// Strings are amazingly complex. They can be formed from multiple tokens 1123 /// and can have escape sequences in them in addition to the usual trigraph 1124 /// and escaped newline business. This routine handles this complexity. 1125 /// 1126 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1127 const LangOptions &Features, 1128 const TargetInfo &Target) const; 1129 1130 typedef const SourceLocation *tokloc_iterator; 1131 tokloc_iterator tokloc_begin() const { return TokLocs; } 1132 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1133 1134 virtual SourceRange getSourceRange() const { 1135 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1136 } 1137 static bool classof(const Stmt *T) { 1138 return T->getStmtClass() == StringLiteralClass; 1139 } 1140 static bool classof(const StringLiteral *) { return true; } 1141 1142 // Iterators 1143 virtual child_iterator child_begin(); 1144 virtual child_iterator child_end(); 1145}; 1146 1147/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1148/// AST node is only formed if full location information is requested. 1149class ParenExpr : public Expr { 1150 SourceLocation L, R; 1151 Stmt *Val; 1152public: 1153 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1154 : Expr(ParenExprClass, val->getType(), 1155 val->getValueKind(), val->getObjectKind(), 1156 val->isTypeDependent(), val->isValueDependent(), 1157 val->containsUnexpandedParameterPack()), 1158 L(l), R(r), Val(val) {} 1159 1160 /// \brief Construct an empty parenthesized expression. 1161 explicit ParenExpr(EmptyShell Empty) 1162 : Expr(ParenExprClass, Empty) { } 1163 1164 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1165 Expr *getSubExpr() { return cast<Expr>(Val); } 1166 void setSubExpr(Expr *E) { Val = E; } 1167 1168 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1169 1170 /// \brief Get the location of the left parentheses '('. 1171 SourceLocation getLParen() const { return L; } 1172 void setLParen(SourceLocation Loc) { L = Loc; } 1173 1174 /// \brief Get the location of the right parentheses ')'. 1175 SourceLocation getRParen() const { return R; } 1176 void setRParen(SourceLocation Loc) { R = Loc; } 1177 1178 static bool classof(const Stmt *T) { 1179 return T->getStmtClass() == ParenExprClass; 1180 } 1181 static bool classof(const ParenExpr *) { return true; } 1182 1183 // Iterators 1184 virtual child_iterator child_begin(); 1185 virtual child_iterator child_end(); 1186}; 1187 1188 1189/// UnaryOperator - This represents the unary-expression's (except sizeof and 1190/// alignof), the postinc/postdec operators from postfix-expression, and various 1191/// extensions. 1192/// 1193/// Notes on various nodes: 1194/// 1195/// Real/Imag - These return the real/imag part of a complex operand. If 1196/// applied to a non-complex value, the former returns its operand and the 1197/// later returns zero in the type of the operand. 1198/// 1199class UnaryOperator : public Expr { 1200public: 1201 typedef UnaryOperatorKind Opcode; 1202 1203private: 1204 unsigned Opc : 5; 1205 SourceLocation Loc; 1206 Stmt *Val; 1207public: 1208 1209 UnaryOperator(Expr *input, Opcode opc, QualType type, 1210 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1211 : Expr(UnaryOperatorClass, type, VK, OK, 1212 input->isTypeDependent() || type->isDependentType(), 1213 input->isValueDependent(), 1214 input->containsUnexpandedParameterPack()), 1215 Opc(opc), Loc(l), Val(input) {} 1216 1217 /// \brief Build an empty unary operator. 1218 explicit UnaryOperator(EmptyShell Empty) 1219 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1220 1221 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1222 void setOpcode(Opcode O) { Opc = O; } 1223 1224 Expr *getSubExpr() const { return cast<Expr>(Val); } 1225 void setSubExpr(Expr *E) { Val = E; } 1226 1227 /// getOperatorLoc - Return the location of the operator. 1228 SourceLocation getOperatorLoc() const { return Loc; } 1229 void setOperatorLoc(SourceLocation L) { Loc = L; } 1230 1231 /// isPostfix - Return true if this is a postfix operation, like x++. 1232 static bool isPostfix(Opcode Op) { 1233 return Op == UO_PostInc || Op == UO_PostDec; 1234 } 1235 1236 /// isPrefix - Return true if this is a prefix operation, like --x. 1237 static bool isPrefix(Opcode Op) { 1238 return Op == UO_PreInc || Op == UO_PreDec; 1239 } 1240 1241 bool isPrefix() const { return isPrefix(getOpcode()); } 1242 bool isPostfix() const { return isPostfix(getOpcode()); } 1243 bool isIncrementOp() const { 1244 return Opc == UO_PreInc || Opc == UO_PostInc; 1245 } 1246 bool isIncrementDecrementOp() const { 1247 return Opc <= UO_PreDec; 1248 } 1249 static bool isArithmeticOp(Opcode Op) { 1250 return Op >= UO_Plus && Op <= UO_LNot; 1251 } 1252 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1253 1254 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1255 /// corresponds to, e.g. "sizeof" or "[pre]++" 1256 static const char *getOpcodeStr(Opcode Op); 1257 1258 /// \brief Retrieve the unary opcode that corresponds to the given 1259 /// overloaded operator. 1260 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1261 1262 /// \brief Retrieve the overloaded operator kind that corresponds to 1263 /// the given unary opcode. 1264 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1265 1266 virtual SourceRange getSourceRange() const { 1267 if (isPostfix()) 1268 return SourceRange(Val->getLocStart(), Loc); 1269 else 1270 return SourceRange(Loc, Val->getLocEnd()); 1271 } 1272 virtual SourceLocation getExprLoc() const { return Loc; } 1273 1274 static bool classof(const Stmt *T) { 1275 return T->getStmtClass() == UnaryOperatorClass; 1276 } 1277 static bool classof(const UnaryOperator *) { return true; } 1278 1279 // Iterators 1280 virtual child_iterator child_begin(); 1281 virtual child_iterator child_end(); 1282}; 1283 1284/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1285/// offsetof(record-type, member-designator). For example, given: 1286/// @code 1287/// struct S { 1288/// float f; 1289/// double d; 1290/// }; 1291/// struct T { 1292/// int i; 1293/// struct S s[10]; 1294/// }; 1295/// @endcode 1296/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1297 1298class OffsetOfExpr : public Expr { 1299public: 1300 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1301 class OffsetOfNode { 1302 public: 1303 /// \brief The kind of offsetof node we have. 1304 enum Kind { 1305 /// \brief An index into an array. 1306 Array = 0x00, 1307 /// \brief A field. 1308 Field = 0x01, 1309 /// \brief A field in a dependent type, known only by its name. 1310 Identifier = 0x02, 1311 /// \brief An implicit indirection through a C++ base class, when the 1312 /// field found is in a base class. 1313 Base = 0x03 1314 }; 1315 1316 private: 1317 enum { MaskBits = 2, Mask = 0x03 }; 1318 1319 /// \brief The source range that covers this part of the designator. 1320 SourceRange Range; 1321 1322 /// \brief The data describing the designator, which comes in three 1323 /// different forms, depending on the lower two bits. 1324 /// - An unsigned index into the array of Expr*'s stored after this node 1325 /// in memory, for [constant-expression] designators. 1326 /// - A FieldDecl*, for references to a known field. 1327 /// - An IdentifierInfo*, for references to a field with a given name 1328 /// when the class type is dependent. 1329 /// - A CXXBaseSpecifier*, for references that look at a field in a 1330 /// base class. 1331 uintptr_t Data; 1332 1333 public: 1334 /// \brief Create an offsetof node that refers to an array element. 1335 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1336 SourceLocation RBracketLoc) 1337 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1338 1339 /// \brief Create an offsetof node that refers to a field. 1340 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1341 SourceLocation NameLoc) 1342 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1343 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1344 1345 /// \brief Create an offsetof node that refers to an identifier. 1346 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1347 SourceLocation NameLoc) 1348 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1349 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1350 1351 /// \brief Create an offsetof node that refers into a C++ base class. 1352 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1353 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1354 1355 /// \brief Determine what kind of offsetof node this is. 1356 Kind getKind() const { 1357 return static_cast<Kind>(Data & Mask); 1358 } 1359 1360 /// \brief For an array element node, returns the index into the array 1361 /// of expressions. 1362 unsigned getArrayExprIndex() const { 1363 assert(getKind() == Array); 1364 return Data >> 2; 1365 } 1366 1367 /// \brief For a field offsetof node, returns the field. 1368 FieldDecl *getField() const { 1369 assert(getKind() == Field); 1370 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1371 } 1372 1373 /// \brief For a field or identifier offsetof node, returns the name of 1374 /// the field. 1375 IdentifierInfo *getFieldName() const; 1376 1377 /// \brief For a base class node, returns the base specifier. 1378 CXXBaseSpecifier *getBase() const { 1379 assert(getKind() == Base); 1380 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1381 } 1382 1383 /// \brief Retrieve the source range that covers this offsetof node. 1384 /// 1385 /// For an array element node, the source range contains the locations of 1386 /// the square brackets. For a field or identifier node, the source range 1387 /// contains the location of the period (if there is one) and the 1388 /// identifier. 1389 SourceRange getRange() const { return Range; } 1390 }; 1391 1392private: 1393 1394 SourceLocation OperatorLoc, RParenLoc; 1395 // Base type; 1396 TypeSourceInfo *TSInfo; 1397 // Number of sub-components (i.e. instances of OffsetOfNode). 1398 unsigned NumComps; 1399 // Number of sub-expressions (i.e. array subscript expressions). 1400 unsigned NumExprs; 1401 1402 OffsetOfExpr(ASTContext &C, QualType type, 1403 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1404 OffsetOfNode* compsPtr, unsigned numComps, 1405 Expr** exprsPtr, unsigned numExprs, 1406 SourceLocation RParenLoc); 1407 1408 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1409 : Expr(OffsetOfExprClass, EmptyShell()), 1410 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1411 1412public: 1413 1414 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1415 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1416 OffsetOfNode* compsPtr, unsigned numComps, 1417 Expr** exprsPtr, unsigned numExprs, 1418 SourceLocation RParenLoc); 1419 1420 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1421 unsigned NumComps, unsigned NumExprs); 1422 1423 /// getOperatorLoc - Return the location of the operator. 1424 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1425 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1426 1427 /// \brief Return the location of the right parentheses. 1428 SourceLocation getRParenLoc() const { return RParenLoc; } 1429 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1430 1431 TypeSourceInfo *getTypeSourceInfo() const { 1432 return TSInfo; 1433 } 1434 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1435 TSInfo = tsi; 1436 } 1437 1438 const OffsetOfNode &getComponent(unsigned Idx) { 1439 assert(Idx < NumComps && "Subscript out of range"); 1440 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1441 } 1442 1443 void setComponent(unsigned Idx, OffsetOfNode ON) { 1444 assert(Idx < NumComps && "Subscript out of range"); 1445 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1446 } 1447 1448 unsigned getNumComponents() const { 1449 return NumComps; 1450 } 1451 1452 Expr* getIndexExpr(unsigned Idx) { 1453 assert(Idx < NumExprs && "Subscript out of range"); 1454 return reinterpret_cast<Expr **>( 1455 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1456 } 1457 1458 void setIndexExpr(unsigned Idx, Expr* E) { 1459 assert(Idx < NumComps && "Subscript out of range"); 1460 reinterpret_cast<Expr **>( 1461 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1462 } 1463 1464 unsigned getNumExpressions() const { 1465 return NumExprs; 1466 } 1467 1468 virtual SourceRange getSourceRange() const { 1469 return SourceRange(OperatorLoc, RParenLoc); 1470 } 1471 1472 static bool classof(const Stmt *T) { 1473 return T->getStmtClass() == OffsetOfExprClass; 1474 } 1475 1476 static bool classof(const OffsetOfExpr *) { return true; } 1477 1478 // Iterators 1479 virtual child_iterator child_begin(); 1480 virtual child_iterator child_end(); 1481}; 1482 1483/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1484/// types and expressions. 1485class SizeOfAlignOfExpr : public Expr { 1486 bool isSizeof : 1; // true if sizeof, false if alignof. 1487 bool isType : 1; // true if operand is a type, false if an expression 1488 union { 1489 TypeSourceInfo *Ty; 1490 Stmt *Ex; 1491 } Argument; 1492 SourceLocation OpLoc, RParenLoc; 1493 1494public: 1495 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1496 QualType resultType, SourceLocation op, 1497 SourceLocation rp) : 1498 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1499 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1500 // Value-dependent if the argument is type-dependent. 1501 TInfo->getType()->isDependentType(), 1502 TInfo->getType()->containsUnexpandedParameterPack()), 1503 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1504 Argument.Ty = TInfo; 1505 } 1506 1507 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1508 QualType resultType, SourceLocation op, 1509 SourceLocation rp) : 1510 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1511 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1512 // Value-dependent if the argument is type-dependent. 1513 E->isTypeDependent(), 1514 E->containsUnexpandedParameterPack()), 1515 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1516 Argument.Ex = E; 1517 } 1518 1519 /// \brief Construct an empty sizeof/alignof expression. 1520 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1521 : Expr(SizeOfAlignOfExprClass, Empty) { } 1522 1523 bool isSizeOf() const { return isSizeof; } 1524 void setSizeof(bool S) { isSizeof = S; } 1525 1526 bool isArgumentType() const { return isType; } 1527 QualType getArgumentType() const { 1528 return getArgumentTypeInfo()->getType(); 1529 } 1530 TypeSourceInfo *getArgumentTypeInfo() const { 1531 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1532 return Argument.Ty; 1533 } 1534 Expr *getArgumentExpr() { 1535 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1536 return static_cast<Expr*>(Argument.Ex); 1537 } 1538 const Expr *getArgumentExpr() const { 1539 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1540 } 1541 1542 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1543 void setArgument(TypeSourceInfo *TInfo) { 1544 Argument.Ty = TInfo; 1545 isType = true; 1546 } 1547 1548 /// Gets the argument type, or the type of the argument expression, whichever 1549 /// is appropriate. 1550 QualType getTypeOfArgument() const { 1551 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1552 } 1553 1554 SourceLocation getOperatorLoc() const { return OpLoc; } 1555 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1556 1557 SourceLocation getRParenLoc() const { return RParenLoc; } 1558 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1559 1560 virtual SourceRange getSourceRange() const { 1561 return SourceRange(OpLoc, RParenLoc); 1562 } 1563 1564 static bool classof(const Stmt *T) { 1565 return T->getStmtClass() == SizeOfAlignOfExprClass; 1566 } 1567 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1568 1569 // Iterators 1570 virtual child_iterator child_begin(); 1571 virtual child_iterator child_end(); 1572}; 1573 1574//===----------------------------------------------------------------------===// 1575// Postfix Operators. 1576//===----------------------------------------------------------------------===// 1577 1578/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1579class ArraySubscriptExpr : public Expr { 1580 enum { LHS, RHS, END_EXPR=2 }; 1581 Stmt* SubExprs[END_EXPR]; 1582 SourceLocation RBracketLoc; 1583public: 1584 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1585 ExprValueKind VK, ExprObjectKind OK, 1586 SourceLocation rbracketloc) 1587 : Expr(ArraySubscriptExprClass, t, VK, OK, 1588 lhs->isTypeDependent() || rhs->isTypeDependent(), 1589 lhs->isValueDependent() || rhs->isValueDependent(), 1590 (lhs->containsUnexpandedParameterPack() || 1591 rhs->containsUnexpandedParameterPack())), 1592 RBracketLoc(rbracketloc) { 1593 SubExprs[LHS] = lhs; 1594 SubExprs[RHS] = rhs; 1595 } 1596 1597 /// \brief Create an empty array subscript expression. 1598 explicit ArraySubscriptExpr(EmptyShell Shell) 1599 : Expr(ArraySubscriptExprClass, Shell) { } 1600 1601 /// An array access can be written A[4] or 4[A] (both are equivalent). 1602 /// - getBase() and getIdx() always present the normalized view: A[4]. 1603 /// In this case getBase() returns "A" and getIdx() returns "4". 1604 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1605 /// 4[A] getLHS() returns "4". 1606 /// Note: Because vector element access is also written A[4] we must 1607 /// predicate the format conversion in getBase and getIdx only on the 1608 /// the type of the RHS, as it is possible for the LHS to be a vector of 1609 /// integer type 1610 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1611 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1612 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1613 1614 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1615 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1616 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1617 1618 Expr *getBase() { 1619 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1620 } 1621 1622 const Expr *getBase() const { 1623 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1624 } 1625 1626 Expr *getIdx() { 1627 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1628 } 1629 1630 const Expr *getIdx() const { 1631 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1632 } 1633 1634 virtual SourceRange getSourceRange() const { 1635 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1636 } 1637 1638 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1639 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1640 1641 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1642 1643 static bool classof(const Stmt *T) { 1644 return T->getStmtClass() == ArraySubscriptExprClass; 1645 } 1646 static bool classof(const ArraySubscriptExpr *) { return true; } 1647 1648 // Iterators 1649 virtual child_iterator child_begin(); 1650 virtual child_iterator child_end(); 1651}; 1652 1653 1654/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1655/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1656/// while its subclasses may represent alternative syntax that (semantically) 1657/// results in a function call. For example, CXXOperatorCallExpr is 1658/// a subclass for overloaded operator calls that use operator syntax, e.g., 1659/// "str1 + str2" to resolve to a function call. 1660class CallExpr : public Expr { 1661 enum { FN=0, ARGS_START=1 }; 1662 Stmt **SubExprs; 1663 unsigned NumArgs; 1664 SourceLocation RParenLoc; 1665 1666protected: 1667 // This version of the constructor is for derived classes. 1668 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1669 QualType t, ExprValueKind VK, SourceLocation rparenloc); 1670 1671public: 1672 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1673 ExprValueKind VK, SourceLocation rparenloc); 1674 1675 /// \brief Build an empty call expression. 1676 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1677 1678 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1679 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1680 void setCallee(Expr *F) { SubExprs[FN] = F; } 1681 1682 Decl *getCalleeDecl(); 1683 const Decl *getCalleeDecl() const { 1684 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1685 } 1686 1687 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1688 FunctionDecl *getDirectCallee(); 1689 const FunctionDecl *getDirectCallee() const { 1690 return const_cast<CallExpr*>(this)->getDirectCallee(); 1691 } 1692 1693 /// getNumArgs - Return the number of actual arguments to this call. 1694 /// 1695 unsigned getNumArgs() const { return NumArgs; } 1696 1697 /// \brief Retrieve the call arguments. 1698 Expr **getArgs() { return reinterpret_cast<Expr **>(SubExprs + ARGS_START); } 1699 1700 /// getArg - Return the specified argument. 1701 Expr *getArg(unsigned Arg) { 1702 assert(Arg < NumArgs && "Arg access out of range!"); 1703 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1704 } 1705 const Expr *getArg(unsigned Arg) const { 1706 assert(Arg < NumArgs && "Arg access out of range!"); 1707 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1708 } 1709 1710 /// setArg - Set the specified argument. 1711 void setArg(unsigned Arg, Expr *ArgExpr) { 1712 assert(Arg < NumArgs && "Arg access out of range!"); 1713 SubExprs[Arg+ARGS_START] = ArgExpr; 1714 } 1715 1716 /// setNumArgs - This changes the number of arguments present in this call. 1717 /// Any orphaned expressions are deleted by this, and any new operands are set 1718 /// to null. 1719 void setNumArgs(ASTContext& C, unsigned NumArgs); 1720 1721 typedef ExprIterator arg_iterator; 1722 typedef ConstExprIterator const_arg_iterator; 1723 1724 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1725 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1726 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1727 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1728 1729 /// getNumCommas - Return the number of commas that must have been present in 1730 /// this function call. 1731 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1732 1733 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1734 /// not, return 0. 1735 unsigned isBuiltinCall(const ASTContext &Context) const; 1736 1737 /// getCallReturnType - Get the return type of the call expr. This is not 1738 /// always the type of the expr itself, if the return type is a reference 1739 /// type. 1740 QualType getCallReturnType() const; 1741 1742 SourceLocation getRParenLoc() const { return RParenLoc; } 1743 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1744 1745 virtual SourceRange getSourceRange() const { 1746 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1747 } 1748 1749 static bool classof(const Stmt *T) { 1750 return T->getStmtClass() >= firstCallExprConstant && 1751 T->getStmtClass() <= lastCallExprConstant; 1752 } 1753 static bool classof(const CallExpr *) { return true; } 1754 1755 // Iterators 1756 virtual child_iterator child_begin(); 1757 virtual child_iterator child_end(); 1758}; 1759 1760/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1761/// 1762class MemberExpr : public Expr { 1763 /// Extra data stored in some member expressions. 1764 struct MemberNameQualifier : public NameQualifier { 1765 DeclAccessPair FoundDecl; 1766 }; 1767 1768 /// Base - the expression for the base pointer or structure references. In 1769 /// X.F, this is "X". 1770 Stmt *Base; 1771 1772 /// MemberDecl - This is the decl being referenced by the field/member name. 1773 /// In X.F, this is the decl referenced by F. 1774 ValueDecl *MemberDecl; 1775 1776 /// MemberLoc - This is the location of the member name. 1777 SourceLocation MemberLoc; 1778 1779 /// MemberDNLoc - Provides source/type location info for the 1780 /// declaration name embedded in MemberDecl. 1781 DeclarationNameLoc MemberDNLoc; 1782 1783 /// IsArrow - True if this is "X->F", false if this is "X.F". 1784 bool IsArrow : 1; 1785 1786 /// \brief True if this member expression used a nested-name-specifier to 1787 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1788 /// declaration. When true, a MemberNameQualifier 1789 /// structure is allocated immediately after the MemberExpr. 1790 bool HasQualifierOrFoundDecl : 1; 1791 1792 /// \brief True if this member expression specified a template argument list 1793 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1794 /// structure (and its TemplateArguments) are allocated immediately after 1795 /// the MemberExpr or, if the member expression also has a qualifier, after 1796 /// the MemberNameQualifier structure. 1797 bool HasExplicitTemplateArgumentList : 1; 1798 1799 /// \brief Retrieve the qualifier that preceded the member name, if any. 1800 MemberNameQualifier *getMemberQualifier() { 1801 assert(HasQualifierOrFoundDecl); 1802 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1803 } 1804 1805 /// \brief Retrieve the qualifier that preceded the member name, if any. 1806 const MemberNameQualifier *getMemberQualifier() const { 1807 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1808 } 1809 1810public: 1811 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1812 const DeclarationNameInfo &NameInfo, QualType ty, 1813 ExprValueKind VK, ExprObjectKind OK) 1814 : Expr(MemberExprClass, ty, VK, OK, 1815 base->isTypeDependent(), base->isValueDependent(), 1816 base->containsUnexpandedParameterPack()), 1817 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1818 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1819 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1820 assert(memberdecl->getDeclName() == NameInfo.getName()); 1821 } 1822 1823 // NOTE: this constructor should be used only when it is known that 1824 // the member name can not provide additional syntactic info 1825 // (i.e., source locations for C++ operator names or type source info 1826 // for constructors, destructors and conversion oeprators). 1827 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1828 SourceLocation l, QualType ty, 1829 ExprValueKind VK, ExprObjectKind OK) 1830 : Expr(MemberExprClass, ty, VK, OK, 1831 base->isTypeDependent(), base->isValueDependent(), 1832 base->containsUnexpandedParameterPack()), 1833 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1834 IsArrow(isarrow), 1835 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1836 1837 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1838 NestedNameSpecifier *qual, SourceRange qualrange, 1839 ValueDecl *memberdecl, DeclAccessPair founddecl, 1840 DeclarationNameInfo MemberNameInfo, 1841 const TemplateArgumentListInfo *targs, 1842 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1843 1844 void setBase(Expr *E) { Base = E; } 1845 Expr *getBase() const { return cast<Expr>(Base); } 1846 1847 /// \brief Retrieve the member declaration to which this expression refers. 1848 /// 1849 /// The returned declaration will either be a FieldDecl or (in C++) 1850 /// a CXXMethodDecl. 1851 ValueDecl *getMemberDecl() const { return MemberDecl; } 1852 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1853 1854 /// \brief Retrieves the declaration found by lookup. 1855 DeclAccessPair getFoundDecl() const { 1856 if (!HasQualifierOrFoundDecl) 1857 return DeclAccessPair::make(getMemberDecl(), 1858 getMemberDecl()->getAccess()); 1859 return getMemberQualifier()->FoundDecl; 1860 } 1861 1862 /// \brief Determines whether this member expression actually had 1863 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1864 /// x->Base::foo. 1865 bool hasQualifier() const { return getQualifier() != 0; } 1866 1867 /// \brief If the member name was qualified, retrieves the source range of 1868 /// the nested-name-specifier that precedes the member name. Otherwise, 1869 /// returns an empty source range. 1870 SourceRange getQualifierRange() const { 1871 if (!HasQualifierOrFoundDecl) 1872 return SourceRange(); 1873 1874 return getMemberQualifier()->Range; 1875 } 1876 1877 /// \brief If the member name was qualified, retrieves the 1878 /// nested-name-specifier that precedes the member name. Otherwise, returns 1879 /// NULL. 1880 NestedNameSpecifier *getQualifier() const { 1881 if (!HasQualifierOrFoundDecl) 1882 return 0; 1883 1884 return getMemberQualifier()->NNS; 1885 } 1886 1887 /// \brief Determines whether this member expression actually had a C++ 1888 /// template argument list explicitly specified, e.g., x.f<int>. 1889 bool hasExplicitTemplateArgs() const { 1890 return HasExplicitTemplateArgumentList; 1891 } 1892 1893 /// \brief Copies the template arguments (if present) into the given 1894 /// structure. 1895 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1896 if (hasExplicitTemplateArgs()) 1897 getExplicitTemplateArgs().copyInto(List); 1898 } 1899 1900 /// \brief Retrieve the explicit template argument list that 1901 /// follow the member template name. This must only be called on an 1902 /// expression with explicit template arguments. 1903 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1904 assert(HasExplicitTemplateArgumentList); 1905 if (!HasQualifierOrFoundDecl) 1906 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1907 1908 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1909 getMemberQualifier() + 1); 1910 } 1911 1912 /// \brief Retrieve the explicit template argument list that 1913 /// followed the member template name. This must only be called on 1914 /// an expression with explicit template arguments. 1915 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1916 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1917 } 1918 1919 /// \brief Retrieves the optional explicit template arguments. 1920 /// This points to the same data as getExplicitTemplateArgs(), but 1921 /// returns null if there are no explicit template arguments. 1922 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1923 if (!hasExplicitTemplateArgs()) return 0; 1924 return &getExplicitTemplateArgs(); 1925 } 1926 1927 /// \brief Retrieve the location of the left angle bracket following the 1928 /// member name ('<'), if any. 1929 SourceLocation getLAngleLoc() const { 1930 if (!HasExplicitTemplateArgumentList) 1931 return SourceLocation(); 1932 1933 return getExplicitTemplateArgs().LAngleLoc; 1934 } 1935 1936 /// \brief Retrieve the template arguments provided as part of this 1937 /// template-id. 1938 const TemplateArgumentLoc *getTemplateArgs() const { 1939 if (!HasExplicitTemplateArgumentList) 1940 return 0; 1941 1942 return getExplicitTemplateArgs().getTemplateArgs(); 1943 } 1944 1945 /// \brief Retrieve the number of template arguments provided as part of this 1946 /// template-id. 1947 unsigned getNumTemplateArgs() const { 1948 if (!HasExplicitTemplateArgumentList) 1949 return 0; 1950 1951 return getExplicitTemplateArgs().NumTemplateArgs; 1952 } 1953 1954 /// \brief Retrieve the location of the right angle bracket following the 1955 /// template arguments ('>'). 1956 SourceLocation getRAngleLoc() const { 1957 if (!HasExplicitTemplateArgumentList) 1958 return SourceLocation(); 1959 1960 return getExplicitTemplateArgs().RAngleLoc; 1961 } 1962 1963 /// \brief Retrieve the member declaration name info. 1964 DeclarationNameInfo getMemberNameInfo() const { 1965 return DeclarationNameInfo(MemberDecl->getDeclName(), 1966 MemberLoc, MemberDNLoc); 1967 } 1968 1969 bool isArrow() const { return IsArrow; } 1970 void setArrow(bool A) { IsArrow = A; } 1971 1972 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1973 /// location of 'F'. 1974 SourceLocation getMemberLoc() const { return MemberLoc; } 1975 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1976 1977 virtual SourceRange getSourceRange() const { 1978 // If we have an implicit base (like a C++ implicit this), 1979 // make sure not to return its location 1980 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1981 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1982 1983 SourceLocation BaseLoc = getBase()->getLocStart(); 1984 if (BaseLoc.isInvalid()) 1985 return SourceRange(MemberLoc, EndLoc); 1986 return SourceRange(BaseLoc, EndLoc); 1987 } 1988 1989 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1990 1991 static bool classof(const Stmt *T) { 1992 return T->getStmtClass() == MemberExprClass; 1993 } 1994 static bool classof(const MemberExpr *) { return true; } 1995 1996 // Iterators 1997 virtual child_iterator child_begin(); 1998 virtual child_iterator child_end(); 1999 2000 friend class ASTReader; 2001 friend class ASTStmtWriter; 2002}; 2003 2004/// CompoundLiteralExpr - [C99 6.5.2.5] 2005/// 2006class CompoundLiteralExpr : public Expr { 2007 /// LParenLoc - If non-null, this is the location of the left paren in a 2008 /// compound literal like "(int){4}". This can be null if this is a 2009 /// synthesized compound expression. 2010 SourceLocation LParenLoc; 2011 2012 /// The type as written. This can be an incomplete array type, in 2013 /// which case the actual expression type will be different. 2014 TypeSourceInfo *TInfo; 2015 Stmt *Init; 2016 bool FileScope; 2017public: 2018 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2019 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2020 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2021 tinfo->getType()->isDependentType(), 2022 init->isValueDependent(), 2023 init->containsUnexpandedParameterPack()), 2024 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2025 2026 /// \brief Construct an empty compound literal. 2027 explicit CompoundLiteralExpr(EmptyShell Empty) 2028 : Expr(CompoundLiteralExprClass, Empty) { } 2029 2030 const Expr *getInitializer() const { return cast<Expr>(Init); } 2031 Expr *getInitializer() { return cast<Expr>(Init); } 2032 void setInitializer(Expr *E) { Init = E; } 2033 2034 bool isFileScope() const { return FileScope; } 2035 void setFileScope(bool FS) { FileScope = FS; } 2036 2037 SourceLocation getLParenLoc() const { return LParenLoc; } 2038 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2039 2040 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2041 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2042 2043 virtual SourceRange getSourceRange() const { 2044 // FIXME: Init should never be null. 2045 if (!Init) 2046 return SourceRange(); 2047 if (LParenLoc.isInvalid()) 2048 return Init->getSourceRange(); 2049 return SourceRange(LParenLoc, Init->getLocEnd()); 2050 } 2051 2052 static bool classof(const Stmt *T) { 2053 return T->getStmtClass() == CompoundLiteralExprClass; 2054 } 2055 static bool classof(const CompoundLiteralExpr *) { return true; } 2056 2057 // Iterators 2058 virtual child_iterator child_begin(); 2059 virtual child_iterator child_end(); 2060}; 2061 2062/// CastExpr - Base class for type casts, including both implicit 2063/// casts (ImplicitCastExpr) and explicit casts that have some 2064/// representation in the source code (ExplicitCastExpr's derived 2065/// classes). 2066class CastExpr : public Expr { 2067public: 2068 typedef clang::CastKind CastKind; 2069 2070private: 2071 Stmt *Op; 2072 2073 void CheckCastConsistency() const { 2074#ifndef NDEBUG 2075 switch (getCastKind()) { 2076 case CK_DerivedToBase: 2077 case CK_UncheckedDerivedToBase: 2078 case CK_DerivedToBaseMemberPointer: 2079 case CK_BaseToDerived: 2080 case CK_BaseToDerivedMemberPointer: 2081 assert(!path_empty() && "Cast kind should have a base path!"); 2082 break; 2083 2084 // These should not have an inheritance path. 2085 case CK_BitCast: 2086 case CK_Dynamic: 2087 case CK_ToUnion: 2088 case CK_ArrayToPointerDecay: 2089 case CK_FunctionToPointerDecay: 2090 case CK_NullToMemberPointer: 2091 case CK_NullToPointer: 2092 case CK_ConstructorConversion: 2093 case CK_IntegralToPointer: 2094 case CK_PointerToIntegral: 2095 case CK_ToVoid: 2096 case CK_VectorSplat: 2097 case CK_IntegralCast: 2098 case CK_IntegralToFloating: 2099 case CK_FloatingToIntegral: 2100 case CK_FloatingCast: 2101 case CK_AnyPointerToObjCPointerCast: 2102 case CK_AnyPointerToBlockPointerCast: 2103 case CK_ObjCObjectLValueCast: 2104 case CK_FloatingRealToComplex: 2105 case CK_FloatingComplexToReal: 2106 case CK_FloatingComplexCast: 2107 case CK_FloatingComplexToIntegralComplex: 2108 case CK_IntegralRealToComplex: 2109 case CK_IntegralComplexToReal: 2110 case CK_IntegralComplexCast: 2111 case CK_IntegralComplexToFloatingComplex: 2112 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2113 // fallthrough to check for null base path 2114 2115 case CK_Dependent: 2116 case CK_LValueToRValue: 2117 case CK_GetObjCProperty: 2118 case CK_NoOp: 2119 case CK_PointerToBoolean: 2120 case CK_IntegralToBoolean: 2121 case CK_FloatingToBoolean: 2122 case CK_MemberPointerToBoolean: 2123 case CK_FloatingComplexToBoolean: 2124 case CK_IntegralComplexToBoolean: 2125 case CK_LValueBitCast: // -> bool& 2126 case CK_UserDefinedConversion: // operator bool() 2127 assert(path_empty() && "Cast kind should not have a base path!"); 2128 break; 2129 } 2130#endif 2131 } 2132 2133 const CXXBaseSpecifier * const *path_buffer() const { 2134 return const_cast<CastExpr*>(this)->path_buffer(); 2135 } 2136 CXXBaseSpecifier **path_buffer(); 2137 2138protected: 2139 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2140 const CastKind kind, Expr *op, unsigned BasePathSize) : 2141 Expr(SC, ty, VK, OK_Ordinary, 2142 // Cast expressions are type-dependent if the type is 2143 // dependent (C++ [temp.dep.expr]p3). 2144 ty->isDependentType(), 2145 // Cast expressions are value-dependent if the type is 2146 // dependent or if the subexpression is value-dependent. 2147 ty->isDependentType() || (op && op->isValueDependent()), 2148 (ty->containsUnexpandedParameterPack() || 2149 op->containsUnexpandedParameterPack())), 2150 Op(op) { 2151 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2152 CastExprBits.Kind = kind; 2153 CastExprBits.BasePathSize = BasePathSize; 2154 CheckCastConsistency(); 2155 } 2156 2157 /// \brief Construct an empty cast. 2158 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2159 : Expr(SC, Empty) { 2160 CastExprBits.BasePathSize = BasePathSize; 2161 } 2162 2163public: 2164 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2165 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2166 const char *getCastKindName() const; 2167 2168 Expr *getSubExpr() { return cast<Expr>(Op); } 2169 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2170 void setSubExpr(Expr *E) { Op = E; } 2171 2172 /// \brief Retrieve the cast subexpression as it was written in the source 2173 /// code, looking through any implicit casts or other intermediate nodes 2174 /// introduced by semantic analysis. 2175 Expr *getSubExprAsWritten(); 2176 const Expr *getSubExprAsWritten() const { 2177 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2178 } 2179 2180 typedef CXXBaseSpecifier **path_iterator; 2181 typedef const CXXBaseSpecifier * const *path_const_iterator; 2182 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2183 unsigned path_size() const { return CastExprBits.BasePathSize; } 2184 path_iterator path_begin() { return path_buffer(); } 2185 path_iterator path_end() { return path_buffer() + path_size(); } 2186 path_const_iterator path_begin() const { return path_buffer(); } 2187 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2188 2189 void setCastPath(const CXXCastPath &Path); 2190 2191 static bool classof(const Stmt *T) { 2192 return T->getStmtClass() >= firstCastExprConstant && 2193 T->getStmtClass() <= lastCastExprConstant; 2194 } 2195 static bool classof(const CastExpr *) { return true; } 2196 2197 // Iterators 2198 virtual child_iterator child_begin(); 2199 virtual child_iterator child_end(); 2200}; 2201 2202/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2203/// conversions, which have no direct representation in the original 2204/// source code. For example: converting T[]->T*, void f()->void 2205/// (*f)(), float->double, short->int, etc. 2206/// 2207/// In C, implicit casts always produce rvalues. However, in C++, an 2208/// implicit cast whose result is being bound to a reference will be 2209/// an lvalue or xvalue. For example: 2210/// 2211/// @code 2212/// class Base { }; 2213/// class Derived : public Base { }; 2214/// Derived &&ref(); 2215/// void f(Derived d) { 2216/// Base& b = d; // initializer is an ImplicitCastExpr 2217/// // to an lvalue of type Base 2218/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2219/// // to an xvalue of type Base 2220/// } 2221/// @endcode 2222class ImplicitCastExpr : public CastExpr { 2223private: 2224 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2225 unsigned BasePathLength, ExprValueKind VK) 2226 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2227 } 2228 2229 /// \brief Construct an empty implicit cast. 2230 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2231 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2232 2233public: 2234 enum OnStack_t { OnStack }; 2235 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2236 ExprValueKind VK) 2237 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2238 } 2239 2240 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2241 CastKind Kind, Expr *Operand, 2242 const CXXCastPath *BasePath, 2243 ExprValueKind Cat); 2244 2245 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2246 2247 virtual SourceRange getSourceRange() const { 2248 return getSubExpr()->getSourceRange(); 2249 } 2250 2251 static bool classof(const Stmt *T) { 2252 return T->getStmtClass() == ImplicitCastExprClass; 2253 } 2254 static bool classof(const ImplicitCastExpr *) { return true; } 2255}; 2256 2257/// ExplicitCastExpr - An explicit cast written in the source 2258/// code. 2259/// 2260/// This class is effectively an abstract class, because it provides 2261/// the basic representation of an explicitly-written cast without 2262/// specifying which kind of cast (C cast, functional cast, static 2263/// cast, etc.) was written; specific derived classes represent the 2264/// particular style of cast and its location information. 2265/// 2266/// Unlike implicit casts, explicit cast nodes have two different 2267/// types: the type that was written into the source code, and the 2268/// actual type of the expression as determined by semantic 2269/// analysis. These types may differ slightly. For example, in C++ one 2270/// can cast to a reference type, which indicates that the resulting 2271/// expression will be an lvalue or xvalue. The reference type, however, 2272/// will not be used as the type of the expression. 2273class ExplicitCastExpr : public CastExpr { 2274 /// TInfo - Source type info for the (written) type 2275 /// this expression is casting to. 2276 TypeSourceInfo *TInfo; 2277 2278protected: 2279 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2280 CastKind kind, Expr *op, unsigned PathSize, 2281 TypeSourceInfo *writtenTy) 2282 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2283 2284 /// \brief Construct an empty explicit cast. 2285 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2286 : CastExpr(SC, Shell, PathSize) { } 2287 2288public: 2289 /// getTypeInfoAsWritten - Returns the type source info for the type 2290 /// that this expression is casting to. 2291 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2292 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2293 2294 /// getTypeAsWritten - Returns the type that this expression is 2295 /// casting to, as written in the source code. 2296 QualType getTypeAsWritten() const { return TInfo->getType(); } 2297 2298 static bool classof(const Stmt *T) { 2299 return T->getStmtClass() >= firstExplicitCastExprConstant && 2300 T->getStmtClass() <= lastExplicitCastExprConstant; 2301 } 2302 static bool classof(const ExplicitCastExpr *) { return true; } 2303}; 2304 2305/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2306/// cast in C++ (C++ [expr.cast]), which uses the syntax 2307/// (Type)expr. For example: @c (int)f. 2308class CStyleCastExpr : public ExplicitCastExpr { 2309 SourceLocation LPLoc; // the location of the left paren 2310 SourceLocation RPLoc; // the location of the right paren 2311 2312 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2313 unsigned PathSize, TypeSourceInfo *writtenTy, 2314 SourceLocation l, SourceLocation r) 2315 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2316 writtenTy), LPLoc(l), RPLoc(r) {} 2317 2318 /// \brief Construct an empty C-style explicit cast. 2319 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2320 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2321 2322public: 2323 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2324 ExprValueKind VK, CastKind K, 2325 Expr *Op, const CXXCastPath *BasePath, 2326 TypeSourceInfo *WrittenTy, SourceLocation L, 2327 SourceLocation R); 2328 2329 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2330 2331 SourceLocation getLParenLoc() const { return LPLoc; } 2332 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2333 2334 SourceLocation getRParenLoc() const { return RPLoc; } 2335 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2336 2337 virtual SourceRange getSourceRange() const { 2338 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2339 } 2340 static bool classof(const Stmt *T) { 2341 return T->getStmtClass() == CStyleCastExprClass; 2342 } 2343 static bool classof(const CStyleCastExpr *) { return true; } 2344}; 2345 2346/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2347/// 2348/// This expression node kind describes a builtin binary operation, 2349/// such as "x + y" for integer values "x" and "y". The operands will 2350/// already have been converted to appropriate types (e.g., by 2351/// performing promotions or conversions). 2352/// 2353/// In C++, where operators may be overloaded, a different kind of 2354/// expression node (CXXOperatorCallExpr) is used to express the 2355/// invocation of an overloaded operator with operator syntax. Within 2356/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2357/// used to store an expression "x + y" depends on the subexpressions 2358/// for x and y. If neither x or y is type-dependent, and the "+" 2359/// operator resolves to a built-in operation, BinaryOperator will be 2360/// used to express the computation (x and y may still be 2361/// value-dependent). If either x or y is type-dependent, or if the 2362/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2363/// be used to express the computation. 2364class BinaryOperator : public Expr { 2365public: 2366 typedef BinaryOperatorKind Opcode; 2367 2368private: 2369 unsigned Opc : 6; 2370 SourceLocation OpLoc; 2371 2372 enum { LHS, RHS, END_EXPR }; 2373 Stmt* SubExprs[END_EXPR]; 2374public: 2375 2376 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2377 ExprValueKind VK, ExprObjectKind OK, 2378 SourceLocation opLoc) 2379 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2380 lhs->isTypeDependent() || rhs->isTypeDependent(), 2381 lhs->isValueDependent() || rhs->isValueDependent(), 2382 (lhs->containsUnexpandedParameterPack() || 2383 rhs->containsUnexpandedParameterPack())), 2384 Opc(opc), OpLoc(opLoc) { 2385 SubExprs[LHS] = lhs; 2386 SubExprs[RHS] = rhs; 2387 assert(!isCompoundAssignmentOp() && 2388 "Use ArithAssignBinaryOperator for compound assignments"); 2389 } 2390 2391 /// \brief Construct an empty binary operator. 2392 explicit BinaryOperator(EmptyShell Empty) 2393 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2394 2395 SourceLocation getOperatorLoc() const { return OpLoc; } 2396 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2397 2398 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2399 void setOpcode(Opcode O) { Opc = O; } 2400 2401 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2402 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2403 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2404 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2405 2406 virtual SourceRange getSourceRange() const { 2407 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2408 } 2409 2410 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2411 /// corresponds to, e.g. "<<=". 2412 static const char *getOpcodeStr(Opcode Op); 2413 2414 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2415 2416 /// \brief Retrieve the binary opcode that corresponds to the given 2417 /// overloaded operator. 2418 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2419 2420 /// \brief Retrieve the overloaded operator kind that corresponds to 2421 /// the given binary opcode. 2422 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2423 2424 /// predicates to categorize the respective opcodes. 2425 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2426 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2427 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2428 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2429 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2430 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2431 2432 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2433 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2434 2435 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2436 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2437 2438 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2439 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2440 2441 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2442 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2443 2444 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2445 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2446 2447 static bool isAssignmentOp(Opcode Opc) { 2448 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2449 } 2450 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2451 2452 static bool isCompoundAssignmentOp(Opcode Opc) { 2453 return Opc > BO_Assign && Opc <= BO_OrAssign; 2454 } 2455 bool isCompoundAssignmentOp() const { 2456 return isCompoundAssignmentOp(getOpcode()); 2457 } 2458 2459 static bool isShiftAssignOp(Opcode Opc) { 2460 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2461 } 2462 bool isShiftAssignOp() const { 2463 return isShiftAssignOp(getOpcode()); 2464 } 2465 2466 static bool classof(const Stmt *S) { 2467 return S->getStmtClass() >= firstBinaryOperatorConstant && 2468 S->getStmtClass() <= lastBinaryOperatorConstant; 2469 } 2470 static bool classof(const BinaryOperator *) { return true; } 2471 2472 // Iterators 2473 virtual child_iterator child_begin(); 2474 virtual child_iterator child_end(); 2475 2476protected: 2477 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2478 ExprValueKind VK, ExprObjectKind OK, 2479 SourceLocation opLoc, bool dead) 2480 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2481 lhs->isTypeDependent() || rhs->isTypeDependent(), 2482 lhs->isValueDependent() || rhs->isValueDependent(), 2483 (lhs->containsUnexpandedParameterPack() || 2484 rhs->containsUnexpandedParameterPack())), 2485 Opc(opc), OpLoc(opLoc) { 2486 SubExprs[LHS] = lhs; 2487 SubExprs[RHS] = rhs; 2488 } 2489 2490 BinaryOperator(StmtClass SC, EmptyShell Empty) 2491 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2492}; 2493 2494/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2495/// track of the type the operation is performed in. Due to the semantics of 2496/// these operators, the operands are promoted, the aritmetic performed, an 2497/// implicit conversion back to the result type done, then the assignment takes 2498/// place. This captures the intermediate type which the computation is done 2499/// in. 2500class CompoundAssignOperator : public BinaryOperator { 2501 QualType ComputationLHSType; 2502 QualType ComputationResultType; 2503public: 2504 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2505 ExprValueKind VK, ExprObjectKind OK, 2506 QualType CompLHSType, QualType CompResultType, 2507 SourceLocation OpLoc) 2508 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2509 ComputationLHSType(CompLHSType), 2510 ComputationResultType(CompResultType) { 2511 assert(isCompoundAssignmentOp() && 2512 "Only should be used for compound assignments"); 2513 } 2514 2515 /// \brief Build an empty compound assignment operator expression. 2516 explicit CompoundAssignOperator(EmptyShell Empty) 2517 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2518 2519 // The two computation types are the type the LHS is converted 2520 // to for the computation and the type of the result; the two are 2521 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2522 QualType getComputationLHSType() const { return ComputationLHSType; } 2523 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2524 2525 QualType getComputationResultType() const { return ComputationResultType; } 2526 void setComputationResultType(QualType T) { ComputationResultType = T; } 2527 2528 static bool classof(const CompoundAssignOperator *) { return true; } 2529 static bool classof(const Stmt *S) { 2530 return S->getStmtClass() == CompoundAssignOperatorClass; 2531 } 2532}; 2533 2534/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2535/// GNU "missing LHS" extension is in use. 2536/// 2537class ConditionalOperator : public Expr { 2538 enum { COND, LHS, RHS, END_EXPR }; 2539 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2540 Stmt* Save; 2541 SourceLocation QuestionLoc, ColonLoc; 2542public: 2543 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2544 SourceLocation CLoc, Expr *rhs, Expr *save, 2545 QualType t, ExprValueKind VK, ExprObjectKind OK) 2546 : Expr(ConditionalOperatorClass, t, VK, OK, 2547 // FIXME: the type of the conditional operator doesn't 2548 // depend on the type of the conditional, but the standard 2549 // seems to imply that it could. File a bug! 2550 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2551 (cond->isValueDependent() || 2552 (lhs && lhs->isValueDependent()) || 2553 (rhs && rhs->isValueDependent())), 2554 (cond->containsUnexpandedParameterPack() || 2555 (lhs && lhs->containsUnexpandedParameterPack()) || 2556 (rhs && rhs->containsUnexpandedParameterPack()))), 2557 QuestionLoc(QLoc), 2558 ColonLoc(CLoc) { 2559 SubExprs[COND] = cond; 2560 SubExprs[LHS] = lhs; 2561 SubExprs[RHS] = rhs; 2562 Save = save; 2563 } 2564 2565 /// \brief Build an empty conditional operator. 2566 explicit ConditionalOperator(EmptyShell Empty) 2567 : Expr(ConditionalOperatorClass, Empty) { } 2568 2569 // getCond - Return the expression representing the condition for 2570 // the ?: operator. 2571 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2572 void setCond(Expr *E) { SubExprs[COND] = E; } 2573 2574 // getTrueExpr - Return the subexpression representing the value of the ?: 2575 // expression if the condition evaluates to true. 2576 Expr *getTrueExpr() const { 2577 return cast<Expr>(SubExprs[LHS]); 2578 } 2579 2580 // getFalseExpr - Return the subexpression representing the value of the ?: 2581 // expression if the condition evaluates to false. This is the same as getRHS. 2582 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2583 2584 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2585 // allows the left subexpression to be omitted, and instead of that condition 2586 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2587 // expression "x" is only evaluated once. Under this senario, this function 2588 // returns the original, non-converted condition expression for the ?:operator 2589 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2590 2591 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2592 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2593 2594 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2595 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2596 2597 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2598 void setSAVE(Expr *E) { Save = E; } 2599 2600 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2601 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2602 2603 SourceLocation getColonLoc() const { return ColonLoc; } 2604 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2605 2606 virtual SourceRange getSourceRange() const { 2607 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2608 } 2609 static bool classof(const Stmt *T) { 2610 return T->getStmtClass() == ConditionalOperatorClass; 2611 } 2612 static bool classof(const ConditionalOperator *) { return true; } 2613 2614 // Iterators 2615 virtual child_iterator child_begin(); 2616 virtual child_iterator child_end(); 2617}; 2618 2619/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2620class AddrLabelExpr : public Expr { 2621 SourceLocation AmpAmpLoc, LabelLoc; 2622 LabelStmt *Label; 2623public: 2624 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2625 QualType t) 2626 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2627 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2628 2629 /// \brief Build an empty address of a label expression. 2630 explicit AddrLabelExpr(EmptyShell Empty) 2631 : Expr(AddrLabelExprClass, Empty) { } 2632 2633 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2634 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2635 SourceLocation getLabelLoc() const { return LabelLoc; } 2636 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2637 2638 virtual SourceRange getSourceRange() const { 2639 return SourceRange(AmpAmpLoc, LabelLoc); 2640 } 2641 2642 LabelStmt *getLabel() const { return Label; } 2643 void setLabel(LabelStmt *S) { Label = S; } 2644 2645 static bool classof(const Stmt *T) { 2646 return T->getStmtClass() == AddrLabelExprClass; 2647 } 2648 static bool classof(const AddrLabelExpr *) { return true; } 2649 2650 // Iterators 2651 virtual child_iterator child_begin(); 2652 virtual child_iterator child_end(); 2653}; 2654 2655/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2656/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2657/// takes the value of the last subexpression. 2658/// 2659/// A StmtExpr is always an r-value; values "returned" out of a 2660/// StmtExpr will be copied. 2661class StmtExpr : public Expr { 2662 Stmt *SubStmt; 2663 SourceLocation LParenLoc, RParenLoc; 2664public: 2665 // FIXME: Does type-dependence need to be computed differently? 2666 StmtExpr(CompoundStmt *substmt, QualType T, 2667 SourceLocation lp, SourceLocation rp) : 2668 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2669 T->isDependentType(), false, false), 2670 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2671 2672 /// \brief Build an empty statement expression. 2673 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2674 2675 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2676 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2677 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2678 2679 virtual SourceRange getSourceRange() const { 2680 return SourceRange(LParenLoc, RParenLoc); 2681 } 2682 2683 SourceLocation getLParenLoc() const { return LParenLoc; } 2684 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2685 SourceLocation getRParenLoc() const { return RParenLoc; } 2686 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2687 2688 static bool classof(const Stmt *T) { 2689 return T->getStmtClass() == StmtExprClass; 2690 } 2691 static bool classof(const StmtExpr *) { return true; } 2692 2693 // Iterators 2694 virtual child_iterator child_begin(); 2695 virtual child_iterator child_end(); 2696}; 2697 2698 2699/// ShuffleVectorExpr - clang-specific builtin-in function 2700/// __builtin_shufflevector. 2701/// This AST node represents a operator that does a constant 2702/// shuffle, similar to LLVM's shufflevector instruction. It takes 2703/// two vectors and a variable number of constant indices, 2704/// and returns the appropriately shuffled vector. 2705class ShuffleVectorExpr : public Expr { 2706 SourceLocation BuiltinLoc, RParenLoc; 2707 2708 // SubExprs - the list of values passed to the __builtin_shufflevector 2709 // function. The first two are vectors, and the rest are constant 2710 // indices. The number of values in this list is always 2711 // 2+the number of indices in the vector type. 2712 Stmt **SubExprs; 2713 unsigned NumExprs; 2714 2715public: 2716 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2717 QualType Type, SourceLocation BLoc, 2718 SourceLocation RP); 2719 2720 /// \brief Build an empty vector-shuffle expression. 2721 explicit ShuffleVectorExpr(EmptyShell Empty) 2722 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2723 2724 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2725 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2726 2727 SourceLocation getRParenLoc() const { return RParenLoc; } 2728 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2729 2730 virtual SourceRange getSourceRange() const { 2731 return SourceRange(BuiltinLoc, RParenLoc); 2732 } 2733 static bool classof(const Stmt *T) { 2734 return T->getStmtClass() == ShuffleVectorExprClass; 2735 } 2736 static bool classof(const ShuffleVectorExpr *) { return true; } 2737 2738 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2739 /// constant expression, the actual arguments passed in, and the function 2740 /// pointers. 2741 unsigned getNumSubExprs() const { return NumExprs; } 2742 2743 /// \brief Retrieve the array of expressions. 2744 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2745 2746 /// getExpr - Return the Expr at the specified index. 2747 Expr *getExpr(unsigned Index) { 2748 assert((Index < NumExprs) && "Arg access out of range!"); 2749 return cast<Expr>(SubExprs[Index]); 2750 } 2751 const Expr *getExpr(unsigned Index) const { 2752 assert((Index < NumExprs) && "Arg access out of range!"); 2753 return cast<Expr>(SubExprs[Index]); 2754 } 2755 2756 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2757 2758 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2759 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2760 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2761 } 2762 2763 // Iterators 2764 virtual child_iterator child_begin(); 2765 virtual child_iterator child_end(); 2766}; 2767 2768/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2769/// This AST node is similar to the conditional operator (?:) in C, with 2770/// the following exceptions: 2771/// - the test expression must be a integer constant expression. 2772/// - the expression returned acts like the chosen subexpression in every 2773/// visible way: the type is the same as that of the chosen subexpression, 2774/// and all predicates (whether it's an l-value, whether it's an integer 2775/// constant expression, etc.) return the same result as for the chosen 2776/// sub-expression. 2777class ChooseExpr : public Expr { 2778 enum { COND, LHS, RHS, END_EXPR }; 2779 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2780 SourceLocation BuiltinLoc, RParenLoc; 2781public: 2782 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2783 QualType t, ExprValueKind VK, ExprObjectKind OK, 2784 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2785 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 2786 (cond->containsUnexpandedParameterPack() || 2787 lhs->containsUnexpandedParameterPack() || 2788 rhs->containsUnexpandedParameterPack())), 2789 BuiltinLoc(BLoc), RParenLoc(RP) { 2790 SubExprs[COND] = cond; 2791 SubExprs[LHS] = lhs; 2792 SubExprs[RHS] = rhs; 2793 } 2794 2795 /// \brief Build an empty __builtin_choose_expr. 2796 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2797 2798 /// isConditionTrue - Return whether the condition is true (i.e. not 2799 /// equal to zero). 2800 bool isConditionTrue(const ASTContext &C) const; 2801 2802 /// getChosenSubExpr - Return the subexpression chosen according to the 2803 /// condition. 2804 Expr *getChosenSubExpr(const ASTContext &C) const { 2805 return isConditionTrue(C) ? getLHS() : getRHS(); 2806 } 2807 2808 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2809 void setCond(Expr *E) { SubExprs[COND] = E; } 2810 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2811 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2812 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2813 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2814 2815 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2816 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2817 2818 SourceLocation getRParenLoc() const { return RParenLoc; } 2819 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2820 2821 virtual SourceRange getSourceRange() const { 2822 return SourceRange(BuiltinLoc, RParenLoc); 2823 } 2824 static bool classof(const Stmt *T) { 2825 return T->getStmtClass() == ChooseExprClass; 2826 } 2827 static bool classof(const ChooseExpr *) { return true; } 2828 2829 // Iterators 2830 virtual child_iterator child_begin(); 2831 virtual child_iterator child_end(); 2832}; 2833 2834/// GNUNullExpr - Implements the GNU __null extension, which is a name 2835/// for a null pointer constant that has integral type (e.g., int or 2836/// long) and is the same size and alignment as a pointer. The __null 2837/// extension is typically only used by system headers, which define 2838/// NULL as __null in C++ rather than using 0 (which is an integer 2839/// that may not match the size of a pointer). 2840class GNUNullExpr : public Expr { 2841 /// TokenLoc - The location of the __null keyword. 2842 SourceLocation TokenLoc; 2843 2844public: 2845 GNUNullExpr(QualType Ty, SourceLocation Loc) 2846 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 2847 TokenLoc(Loc) { } 2848 2849 /// \brief Build an empty GNU __null expression. 2850 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2851 2852 /// getTokenLocation - The location of the __null token. 2853 SourceLocation getTokenLocation() const { return TokenLoc; } 2854 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2855 2856 virtual SourceRange getSourceRange() const { 2857 return SourceRange(TokenLoc); 2858 } 2859 static bool classof(const Stmt *T) { 2860 return T->getStmtClass() == GNUNullExprClass; 2861 } 2862 static bool classof(const GNUNullExpr *) { return true; } 2863 2864 // Iterators 2865 virtual child_iterator child_begin(); 2866 virtual child_iterator child_end(); 2867}; 2868 2869/// VAArgExpr, used for the builtin function __builtin_va_arg. 2870class VAArgExpr : public Expr { 2871 Stmt *Val; 2872 TypeSourceInfo *TInfo; 2873 SourceLocation BuiltinLoc, RParenLoc; 2874public: 2875 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2876 SourceLocation RPLoc, QualType t) 2877 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 2878 t->isDependentType(), false, 2879 (TInfo->getType()->containsUnexpandedParameterPack() || 2880 e->containsUnexpandedParameterPack())), 2881 Val(e), TInfo(TInfo), 2882 BuiltinLoc(BLoc), 2883 RParenLoc(RPLoc) { } 2884 2885 /// \brief Create an empty __builtin_va_arg expression. 2886 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2887 2888 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2889 Expr *getSubExpr() { return cast<Expr>(Val); } 2890 void setSubExpr(Expr *E) { Val = E; } 2891 2892 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2893 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2894 2895 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2896 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2897 2898 SourceLocation getRParenLoc() const { return RParenLoc; } 2899 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2900 2901 virtual SourceRange getSourceRange() const { 2902 return SourceRange(BuiltinLoc, RParenLoc); 2903 } 2904 static bool classof(const Stmt *T) { 2905 return T->getStmtClass() == VAArgExprClass; 2906 } 2907 static bool classof(const VAArgExpr *) { return true; } 2908 2909 // Iterators 2910 virtual child_iterator child_begin(); 2911 virtual child_iterator child_end(); 2912}; 2913 2914/// @brief Describes an C or C++ initializer list. 2915/// 2916/// InitListExpr describes an initializer list, which can be used to 2917/// initialize objects of different types, including 2918/// struct/class/union types, arrays, and vectors. For example: 2919/// 2920/// @code 2921/// struct foo x = { 1, { 2, 3 } }; 2922/// @endcode 2923/// 2924/// Prior to semantic analysis, an initializer list will represent the 2925/// initializer list as written by the user, but will have the 2926/// placeholder type "void". This initializer list is called the 2927/// syntactic form of the initializer, and may contain C99 designated 2928/// initializers (represented as DesignatedInitExprs), initializations 2929/// of subobject members without explicit braces, and so on. Clients 2930/// interested in the original syntax of the initializer list should 2931/// use the syntactic form of the initializer list. 2932/// 2933/// After semantic analysis, the initializer list will represent the 2934/// semantic form of the initializer, where the initializations of all 2935/// subobjects are made explicit with nested InitListExpr nodes and 2936/// C99 designators have been eliminated by placing the designated 2937/// initializations into the subobject they initialize. Additionally, 2938/// any "holes" in the initialization, where no initializer has been 2939/// specified for a particular subobject, will be replaced with 2940/// implicitly-generated ImplicitValueInitExpr expressions that 2941/// value-initialize the subobjects. Note, however, that the 2942/// initializer lists may still have fewer initializers than there are 2943/// elements to initialize within the object. 2944/// 2945/// Given the semantic form of the initializer list, one can retrieve 2946/// the original syntactic form of that initializer list (if it 2947/// exists) using getSyntacticForm(). Since many initializer lists 2948/// have the same syntactic and semantic forms, getSyntacticForm() may 2949/// return NULL, indicating that the current initializer list also 2950/// serves as its syntactic form. 2951class InitListExpr : public Expr { 2952 // FIXME: Eliminate this vector in favor of ASTContext allocation 2953 typedef ASTVector<Stmt *> InitExprsTy; 2954 InitExprsTy InitExprs; 2955 SourceLocation LBraceLoc, RBraceLoc; 2956 2957 /// Contains the initializer list that describes the syntactic form 2958 /// written in the source code. 2959 InitListExpr *SyntacticForm; 2960 2961 /// If this initializer list initializes a union, specifies which 2962 /// field within the union will be initialized. 2963 FieldDecl *UnionFieldInit; 2964 2965 /// Whether this initializer list originally had a GNU array-range 2966 /// designator in it. This is a temporary marker used by CodeGen. 2967 bool HadArrayRangeDesignator; 2968 2969public: 2970 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2971 Expr **initexprs, unsigned numinits, 2972 SourceLocation rbraceloc); 2973 2974 /// \brief Build an empty initializer list. 2975 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2976 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2977 2978 unsigned getNumInits() const { return InitExprs.size(); } 2979 2980 /// \brief Retrieve the set of initializers. 2981 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 2982 2983 const Expr *getInit(unsigned Init) const { 2984 assert(Init < getNumInits() && "Initializer access out of range!"); 2985 return cast_or_null<Expr>(InitExprs[Init]); 2986 } 2987 2988 Expr *getInit(unsigned Init) { 2989 assert(Init < getNumInits() && "Initializer access out of range!"); 2990 return cast_or_null<Expr>(InitExprs[Init]); 2991 } 2992 2993 void setInit(unsigned Init, Expr *expr) { 2994 assert(Init < getNumInits() && "Initializer access out of range!"); 2995 InitExprs[Init] = expr; 2996 } 2997 2998 /// \brief Reserve space for some number of initializers. 2999 void reserveInits(ASTContext &C, unsigned NumInits); 3000 3001 /// @brief Specify the number of initializers 3002 /// 3003 /// If there are more than @p NumInits initializers, the remaining 3004 /// initializers will be destroyed. If there are fewer than @p 3005 /// NumInits initializers, NULL expressions will be added for the 3006 /// unknown initializers. 3007 void resizeInits(ASTContext &Context, unsigned NumInits); 3008 3009 /// @brief Updates the initializer at index @p Init with the new 3010 /// expression @p expr, and returns the old expression at that 3011 /// location. 3012 /// 3013 /// When @p Init is out of range for this initializer list, the 3014 /// initializer list will be extended with NULL expressions to 3015 /// accomodate the new entry. 3016 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3017 3018 /// \brief If this initializes a union, specifies which field in the 3019 /// union to initialize. 3020 /// 3021 /// Typically, this field is the first named field within the 3022 /// union. However, a designated initializer can specify the 3023 /// initialization of a different field within the union. 3024 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 3025 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 3026 3027 // Explicit InitListExpr's originate from source code (and have valid source 3028 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3029 bool isExplicit() { 3030 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3031 } 3032 3033 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3034 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3035 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3036 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3037 3038 /// @brief Retrieve the initializer list that describes the 3039 /// syntactic form of the initializer. 3040 /// 3041 /// 3042 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3043 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3044 3045 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3046 void sawArrayRangeDesignator(bool ARD = true) { 3047 HadArrayRangeDesignator = ARD; 3048 } 3049 3050 virtual SourceRange getSourceRange() const; 3051 3052 static bool classof(const Stmt *T) { 3053 return T->getStmtClass() == InitListExprClass; 3054 } 3055 static bool classof(const InitListExpr *) { return true; } 3056 3057 // Iterators 3058 virtual child_iterator child_begin(); 3059 virtual child_iterator child_end(); 3060 3061 typedef InitExprsTy::iterator iterator; 3062 typedef InitExprsTy::const_iterator const_iterator; 3063 typedef InitExprsTy::reverse_iterator reverse_iterator; 3064 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3065 3066 iterator begin() { return InitExprs.begin(); } 3067 const_iterator begin() const { return InitExprs.begin(); } 3068 iterator end() { return InitExprs.end(); } 3069 const_iterator end() const { return InitExprs.end(); } 3070 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3071 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3072 reverse_iterator rend() { return InitExprs.rend(); } 3073 const_reverse_iterator rend() const { return InitExprs.rend(); } 3074}; 3075 3076/// @brief Represents a C99 designated initializer expression. 3077/// 3078/// A designated initializer expression (C99 6.7.8) contains one or 3079/// more designators (which can be field designators, array 3080/// designators, or GNU array-range designators) followed by an 3081/// expression that initializes the field or element(s) that the 3082/// designators refer to. For example, given: 3083/// 3084/// @code 3085/// struct point { 3086/// double x; 3087/// double y; 3088/// }; 3089/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3090/// @endcode 3091/// 3092/// The InitListExpr contains three DesignatedInitExprs, the first of 3093/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3094/// designators, one array designator for @c [2] followed by one field 3095/// designator for @c .y. The initalization expression will be 1.0. 3096class DesignatedInitExpr : public Expr { 3097public: 3098 /// \brief Forward declaration of the Designator class. 3099 class Designator; 3100 3101private: 3102 /// The location of the '=' or ':' prior to the actual initializer 3103 /// expression. 3104 SourceLocation EqualOrColonLoc; 3105 3106 /// Whether this designated initializer used the GNU deprecated 3107 /// syntax rather than the C99 '=' syntax. 3108 bool GNUSyntax : 1; 3109 3110 /// The number of designators in this initializer expression. 3111 unsigned NumDesignators : 15; 3112 3113 /// \brief The designators in this designated initialization 3114 /// expression. 3115 Designator *Designators; 3116 3117 /// The number of subexpressions of this initializer expression, 3118 /// which contains both the initializer and any additional 3119 /// expressions used by array and array-range designators. 3120 unsigned NumSubExprs : 16; 3121 3122 3123 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3124 const Designator *Designators, 3125 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3126 Expr **IndexExprs, unsigned NumIndexExprs, 3127 Expr *Init); 3128 3129 explicit DesignatedInitExpr(unsigned NumSubExprs) 3130 : Expr(DesignatedInitExprClass, EmptyShell()), 3131 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3132 3133public: 3134 /// A field designator, e.g., ".x". 3135 struct FieldDesignator { 3136 /// Refers to the field that is being initialized. The low bit 3137 /// of this field determines whether this is actually a pointer 3138 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3139 /// initially constructed, a field designator will store an 3140 /// IdentifierInfo*. After semantic analysis has resolved that 3141 /// name, the field designator will instead store a FieldDecl*. 3142 uintptr_t NameOrField; 3143 3144 /// The location of the '.' in the designated initializer. 3145 unsigned DotLoc; 3146 3147 /// The location of the field name in the designated initializer. 3148 unsigned FieldLoc; 3149 }; 3150 3151 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3152 struct ArrayOrRangeDesignator { 3153 /// Location of the first index expression within the designated 3154 /// initializer expression's list of subexpressions. 3155 unsigned Index; 3156 /// The location of the '[' starting the array range designator. 3157 unsigned LBracketLoc; 3158 /// The location of the ellipsis separating the start and end 3159 /// indices. Only valid for GNU array-range designators. 3160 unsigned EllipsisLoc; 3161 /// The location of the ']' terminating the array range designator. 3162 unsigned RBracketLoc; 3163 }; 3164 3165 /// @brief Represents a single C99 designator. 3166 /// 3167 /// @todo This class is infuriatingly similar to clang::Designator, 3168 /// but minor differences (storing indices vs. storing pointers) 3169 /// keep us from reusing it. Try harder, later, to rectify these 3170 /// differences. 3171 class Designator { 3172 /// @brief The kind of designator this describes. 3173 enum { 3174 FieldDesignator, 3175 ArrayDesignator, 3176 ArrayRangeDesignator 3177 } Kind; 3178 3179 union { 3180 /// A field designator, e.g., ".x". 3181 struct FieldDesignator Field; 3182 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3183 struct ArrayOrRangeDesignator ArrayOrRange; 3184 }; 3185 friend class DesignatedInitExpr; 3186 3187 public: 3188 Designator() {} 3189 3190 /// @brief Initializes a field designator. 3191 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3192 SourceLocation FieldLoc) 3193 : Kind(FieldDesignator) { 3194 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3195 Field.DotLoc = DotLoc.getRawEncoding(); 3196 Field.FieldLoc = FieldLoc.getRawEncoding(); 3197 } 3198 3199 /// @brief Initializes an array designator. 3200 Designator(unsigned Index, SourceLocation LBracketLoc, 3201 SourceLocation RBracketLoc) 3202 : Kind(ArrayDesignator) { 3203 ArrayOrRange.Index = Index; 3204 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3205 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3206 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3207 } 3208 3209 /// @brief Initializes a GNU array-range designator. 3210 Designator(unsigned Index, SourceLocation LBracketLoc, 3211 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3212 : Kind(ArrayRangeDesignator) { 3213 ArrayOrRange.Index = Index; 3214 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3215 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3216 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3217 } 3218 3219 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3220 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3221 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3222 3223 IdentifierInfo * getFieldName(); 3224 3225 FieldDecl *getField() { 3226 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3227 if (Field.NameOrField & 0x01) 3228 return 0; 3229 else 3230 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3231 } 3232 3233 void setField(FieldDecl *FD) { 3234 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3235 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3236 } 3237 3238 SourceLocation getDotLoc() const { 3239 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3240 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3241 } 3242 3243 SourceLocation getFieldLoc() const { 3244 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3245 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3246 } 3247 3248 SourceLocation getLBracketLoc() const { 3249 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3250 "Only valid on an array or array-range designator"); 3251 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3252 } 3253 3254 SourceLocation getRBracketLoc() const { 3255 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3256 "Only valid on an array or array-range designator"); 3257 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3258 } 3259 3260 SourceLocation getEllipsisLoc() const { 3261 assert(Kind == ArrayRangeDesignator && 3262 "Only valid on an array-range designator"); 3263 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3264 } 3265 3266 unsigned getFirstExprIndex() const { 3267 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3268 "Only valid on an array or array-range designator"); 3269 return ArrayOrRange.Index; 3270 } 3271 3272 SourceLocation getStartLocation() const { 3273 if (Kind == FieldDesignator) 3274 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3275 else 3276 return getLBracketLoc(); 3277 } 3278 }; 3279 3280 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3281 unsigned NumDesignators, 3282 Expr **IndexExprs, unsigned NumIndexExprs, 3283 SourceLocation EqualOrColonLoc, 3284 bool GNUSyntax, Expr *Init); 3285 3286 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3287 3288 /// @brief Returns the number of designators in this initializer. 3289 unsigned size() const { return NumDesignators; } 3290 3291 // Iterator access to the designators. 3292 typedef Designator* designators_iterator; 3293 designators_iterator designators_begin() { return Designators; } 3294 designators_iterator designators_end() { 3295 return Designators + NumDesignators; 3296 } 3297 3298 typedef std::reverse_iterator<designators_iterator> 3299 reverse_designators_iterator; 3300 reverse_designators_iterator designators_rbegin() { 3301 return reverse_designators_iterator(designators_end()); 3302 } 3303 reverse_designators_iterator designators_rend() { 3304 return reverse_designators_iterator(designators_begin()); 3305 } 3306 3307 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3308 3309 void setDesignators(ASTContext &C, const Designator *Desigs, 3310 unsigned NumDesigs); 3311 3312 Expr *getArrayIndex(const Designator& D); 3313 Expr *getArrayRangeStart(const Designator& D); 3314 Expr *getArrayRangeEnd(const Designator& D); 3315 3316 /// @brief Retrieve the location of the '=' that precedes the 3317 /// initializer value itself, if present. 3318 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3319 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3320 3321 /// @brief Determines whether this designated initializer used the 3322 /// deprecated GNU syntax for designated initializers. 3323 bool usesGNUSyntax() const { return GNUSyntax; } 3324 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3325 3326 /// @brief Retrieve the initializer value. 3327 Expr *getInit() const { 3328 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3329 } 3330 3331 void setInit(Expr *init) { 3332 *child_begin() = init; 3333 } 3334 3335 /// \brief Retrieve the total number of subexpressions in this 3336 /// designated initializer expression, including the actual 3337 /// initialized value and any expressions that occur within array 3338 /// and array-range designators. 3339 unsigned getNumSubExprs() const { return NumSubExprs; } 3340 3341 Expr *getSubExpr(unsigned Idx) { 3342 assert(Idx < NumSubExprs && "Subscript out of range"); 3343 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3344 Ptr += sizeof(DesignatedInitExpr); 3345 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3346 } 3347 3348 void setSubExpr(unsigned Idx, Expr *E) { 3349 assert(Idx < NumSubExprs && "Subscript out of range"); 3350 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3351 Ptr += sizeof(DesignatedInitExpr); 3352 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3353 } 3354 3355 /// \brief Replaces the designator at index @p Idx with the series 3356 /// of designators in [First, Last). 3357 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3358 const Designator *Last); 3359 3360 virtual SourceRange getSourceRange() const; 3361 3362 static bool classof(const Stmt *T) { 3363 return T->getStmtClass() == DesignatedInitExprClass; 3364 } 3365 static bool classof(const DesignatedInitExpr *) { return true; } 3366 3367 // Iterators 3368 virtual child_iterator child_begin(); 3369 virtual child_iterator child_end(); 3370}; 3371 3372/// \brief Represents an implicitly-generated value initialization of 3373/// an object of a given type. 3374/// 3375/// Implicit value initializations occur within semantic initializer 3376/// list expressions (InitListExpr) as placeholders for subobject 3377/// initializations not explicitly specified by the user. 3378/// 3379/// \see InitListExpr 3380class ImplicitValueInitExpr : public Expr { 3381public: 3382 explicit ImplicitValueInitExpr(QualType ty) 3383 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3384 false, false, false) { } 3385 3386 /// \brief Construct an empty implicit value initialization. 3387 explicit ImplicitValueInitExpr(EmptyShell Empty) 3388 : Expr(ImplicitValueInitExprClass, Empty) { } 3389 3390 static bool classof(const Stmt *T) { 3391 return T->getStmtClass() == ImplicitValueInitExprClass; 3392 } 3393 static bool classof(const ImplicitValueInitExpr *) { return true; } 3394 3395 virtual SourceRange getSourceRange() const { 3396 return SourceRange(); 3397 } 3398 3399 // Iterators 3400 virtual child_iterator child_begin(); 3401 virtual child_iterator child_end(); 3402}; 3403 3404 3405class ParenListExpr : public Expr { 3406 Stmt **Exprs; 3407 unsigned NumExprs; 3408 SourceLocation LParenLoc, RParenLoc; 3409 3410public: 3411 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3412 unsigned numexprs, SourceLocation rparenloc); 3413 3414 /// \brief Build an empty paren list. 3415 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3416 3417 unsigned getNumExprs() const { return NumExprs; } 3418 3419 const Expr* getExpr(unsigned Init) const { 3420 assert(Init < getNumExprs() && "Initializer access out of range!"); 3421 return cast_or_null<Expr>(Exprs[Init]); 3422 } 3423 3424 Expr* getExpr(unsigned Init) { 3425 assert(Init < getNumExprs() && "Initializer access out of range!"); 3426 return cast_or_null<Expr>(Exprs[Init]); 3427 } 3428 3429 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3430 3431 SourceLocation getLParenLoc() const { return LParenLoc; } 3432 SourceLocation getRParenLoc() const { return RParenLoc; } 3433 3434 virtual SourceRange getSourceRange() const { 3435 return SourceRange(LParenLoc, RParenLoc); 3436 } 3437 static bool classof(const Stmt *T) { 3438 return T->getStmtClass() == ParenListExprClass; 3439 } 3440 static bool classof(const ParenListExpr *) { return true; } 3441 3442 // Iterators 3443 virtual child_iterator child_begin(); 3444 virtual child_iterator child_end(); 3445 3446 friend class ASTStmtReader; 3447 friend class ASTStmtWriter; 3448}; 3449 3450 3451//===----------------------------------------------------------------------===// 3452// Clang Extensions 3453//===----------------------------------------------------------------------===// 3454 3455 3456/// ExtVectorElementExpr - This represents access to specific elements of a 3457/// vector, and may occur on the left hand side or right hand side. For example 3458/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3459/// 3460/// Note that the base may have either vector or pointer to vector type, just 3461/// like a struct field reference. 3462/// 3463class ExtVectorElementExpr : public Expr { 3464 Stmt *Base; 3465 IdentifierInfo *Accessor; 3466 SourceLocation AccessorLoc; 3467public: 3468 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3469 IdentifierInfo &accessor, SourceLocation loc) 3470 : Expr(ExtVectorElementExprClass, ty, VK, 3471 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3472 base->isTypeDependent(), base->isValueDependent(), 3473 base->containsUnexpandedParameterPack()), 3474 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3475 3476 /// \brief Build an empty vector element expression. 3477 explicit ExtVectorElementExpr(EmptyShell Empty) 3478 : Expr(ExtVectorElementExprClass, Empty) { } 3479 3480 const Expr *getBase() const { return cast<Expr>(Base); } 3481 Expr *getBase() { return cast<Expr>(Base); } 3482 void setBase(Expr *E) { Base = E; } 3483 3484 IdentifierInfo &getAccessor() const { return *Accessor; } 3485 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3486 3487 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3488 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3489 3490 /// getNumElements - Get the number of components being selected. 3491 unsigned getNumElements() const; 3492 3493 /// containsDuplicateElements - Return true if any element access is 3494 /// repeated. 3495 bool containsDuplicateElements() const; 3496 3497 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3498 /// aggregate Constant of ConstantInt(s). 3499 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3500 3501 virtual SourceRange getSourceRange() const { 3502 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3503 } 3504 3505 /// isArrow - Return true if the base expression is a pointer to vector, 3506 /// return false if the base expression is a vector. 3507 bool isArrow() const; 3508 3509 static bool classof(const Stmt *T) { 3510 return T->getStmtClass() == ExtVectorElementExprClass; 3511 } 3512 static bool classof(const ExtVectorElementExpr *) { return true; } 3513 3514 // Iterators 3515 virtual child_iterator child_begin(); 3516 virtual child_iterator child_end(); 3517}; 3518 3519 3520/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3521/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3522class BlockExpr : public Expr { 3523protected: 3524 BlockDecl *TheBlock; 3525 bool HasBlockDeclRefExprs; 3526public: 3527 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3528 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3529 ty->isDependentType(), false, false), 3530 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3531 3532 /// \brief Build an empty block expression. 3533 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3534 3535 const BlockDecl *getBlockDecl() const { return TheBlock; } 3536 BlockDecl *getBlockDecl() { return TheBlock; } 3537 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3538 3539 // Convenience functions for probing the underlying BlockDecl. 3540 SourceLocation getCaretLocation() const; 3541 const Stmt *getBody() const; 3542 Stmt *getBody(); 3543 3544 virtual SourceRange getSourceRange() const { 3545 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3546 } 3547 3548 /// getFunctionType - Return the underlying function type for this block. 3549 const FunctionType *getFunctionType() const; 3550 3551 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3552 /// inside of the block that reference values outside the block. 3553 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3554 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3555 3556 static bool classof(const Stmt *T) { 3557 return T->getStmtClass() == BlockExprClass; 3558 } 3559 static bool classof(const BlockExpr *) { return true; } 3560 3561 // Iterators 3562 virtual child_iterator child_begin(); 3563 virtual child_iterator child_end(); 3564}; 3565 3566/// BlockDeclRefExpr - A reference to a declared variable, function, 3567/// enum, etc. 3568class BlockDeclRefExpr : public Expr { 3569 ValueDecl *D; 3570 SourceLocation Loc; 3571 bool IsByRef : 1; 3572 bool ConstQualAdded : 1; 3573 Stmt *CopyConstructorVal; 3574public: 3575 // FIXME: Fix type/value dependence! 3576 // FIXME: Variadic templates. 3577 BlockDeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, 3578 SourceLocation l, bool ByRef, bool constAdded = false, 3579 Stmt *copyConstructorVal = 0) 3580 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, 3581 (!t.isNull() && t->isDependentType()), false, false), 3582 D(d), Loc(l), IsByRef(ByRef), 3583 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3584 3585 // \brief Build an empty reference to a declared variable in a 3586 // block. 3587 explicit BlockDeclRefExpr(EmptyShell Empty) 3588 : Expr(BlockDeclRefExprClass, Empty) { } 3589 3590 ValueDecl *getDecl() { return D; } 3591 const ValueDecl *getDecl() const { return D; } 3592 void setDecl(ValueDecl *VD) { D = VD; } 3593 3594 SourceLocation getLocation() const { return Loc; } 3595 void setLocation(SourceLocation L) { Loc = L; } 3596 3597 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3598 3599 bool isByRef() const { return IsByRef; } 3600 void setByRef(bool BR) { IsByRef = BR; } 3601 3602 bool isConstQualAdded() const { return ConstQualAdded; } 3603 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3604 3605 const Expr *getCopyConstructorExpr() const 3606 { return cast_or_null<Expr>(CopyConstructorVal); } 3607 Expr *getCopyConstructorExpr() 3608 { return cast_or_null<Expr>(CopyConstructorVal); } 3609 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3610 3611 static bool classof(const Stmt *T) { 3612 return T->getStmtClass() == BlockDeclRefExprClass; 3613 } 3614 static bool classof(const BlockDeclRefExpr *) { return true; } 3615 3616 // Iterators 3617 virtual child_iterator child_begin(); 3618 virtual child_iterator child_end(); 3619}; 3620 3621/// OpaqueValueExpr - An expression referring to an opaque object of a 3622/// fixed type and value class. These don't correspond to concrete 3623/// syntax; instead they're used to express operations (usually copy 3624/// operations) on values whose source is generally obvious from 3625/// context. 3626class OpaqueValueExpr : public Expr { 3627 friend class ASTStmtReader; 3628public: 3629 OpaqueValueExpr(QualType T, ExprValueKind VK, ExprObjectKind OK = OK_Ordinary) 3630 : Expr(OpaqueValueExprClass, T, VK, OK, 3631 T->isDependentType(), T->isDependentType(), false) { 3632 } 3633 3634 explicit OpaqueValueExpr(EmptyShell Empty) 3635 : Expr(OpaqueValueExprClass, Empty) { } 3636 3637 virtual SourceRange getSourceRange() const; 3638 virtual child_iterator child_begin(); 3639 virtual child_iterator child_end(); 3640 3641 static bool classof(const Stmt *T) { 3642 return T->getStmtClass() == OpaqueValueExprClass; 3643 } 3644 static bool classof(const OpaqueValueExpr *) { return true; } 3645}; 3646 3647} // end namespace clang 3648 3649#endif 3650