Expr.h revision 63c00d7f35fa060c0a446c9df3a4402d9c7757fe
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 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ContainsUnexpandedParameterPack) : Stmt(SC) { 60 ExprBits.TypeDependent = TD; 61 ExprBits.ValueDependent = VD; 62 ExprBits.ValueKind = VK; 63 ExprBits.ObjectKind = OK; 64 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 65 setType(T); 66 } 67 68 /// \brief Construct an empty expression. 69 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 70 71public: 72 QualType getType() const { return TR; } 73 void setType(QualType t) { 74 // In C++, the type of an expression is always adjusted so that it 75 // will not have reference type an expression will never have 76 // reference type (C++ [expr]p6). Use 77 // QualType::getNonReferenceType() to retrieve the non-reference 78 // type. Additionally, inspect Expr::isLvalue to determine whether 79 // an expression that is adjusted in this manner should be 80 // considered an lvalue. 81 assert((t.isNull() || !t->isReferenceType()) && 82 "Expressions can't have reference type"); 83 84 TR = t; 85 } 86 87 /// isValueDependent - Determines whether this expression is 88 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 89 /// array bound of "Chars" in the following example is 90 /// value-dependent. 91 /// @code 92 /// template<int Size, char (&Chars)[Size]> struct meta_string; 93 /// @endcode 94 bool isValueDependent() const { return ExprBits.ValueDependent; } 95 96 /// \brief Set whether this expression is value-dependent or not. 97 void setValueDependent(bool VD) { ExprBits.ValueDependent = VD; } 98 99 /// isTypeDependent - Determines whether this expression is 100 /// type-dependent (C++ [temp.dep.expr]), which means that its type 101 /// could change from one template instantiation to the next. For 102 /// example, the expressions "x" and "x + y" are type-dependent in 103 /// the following code, but "y" is not type-dependent: 104 /// @code 105 /// template<typename T> 106 /// void add(T x, int y) { 107 /// x + y; 108 /// } 109 /// @endcode 110 bool isTypeDependent() const { return ExprBits.TypeDependent; } 111 112 /// \brief Set whether this expression is type-dependent or not. 113 void setTypeDependent(bool TD) { ExprBits.TypeDependent = TD; } 114 115 /// \brief Whether this expression contains an unexpanded parameter 116 /// pack (for C++0x variadic templates). 117 /// 118 /// Given the following function template: 119 /// 120 /// \code 121 /// template<typename F, typename ...Types> 122 /// void forward(const F &f, Types &&...args) { 123 /// f(static_cast<Types&&>(args)...); 124 /// } 125 /// \endcode 126 /// 127 /// The expressions \c args and \c static_cast<Types&&>(args) both 128 /// contain parameter packs. 129 bool containsUnexpandedParameterPack() const { 130 return ExprBits.ContainsUnexpandedParameterPack; 131 } 132 133 /// \brief Set the bit that describes whether this expression 134 /// contains an unexpanded parameter pack. 135 void setContainsUnexpandedParameterPack(bool PP = true) { 136 ExprBits.ContainsUnexpandedParameterPack = PP; 137 } 138 139 /// getExprLoc - Return the preferred location for the arrow when diagnosing 140 /// a problem with a generic expression. 141 SourceLocation getExprLoc() const; 142 143 /// isUnusedResultAWarning - Return true if this immediate expression should 144 /// be warned about if the result is unused. If so, fill in Loc and Ranges 145 /// with location to warn on and the source range[s] to report with the 146 /// warning. 147 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 148 SourceRange &R2, ASTContext &Ctx) const; 149 150 /// isLValue - True if this expression is an "l-value" according to 151 /// the rules of the current language. C and C++ give somewhat 152 /// different rules for this concept, but in general, the result of 153 /// an l-value expression identifies a specific object whereas the 154 /// result of an r-value expression is a value detached from any 155 /// specific storage. 156 /// 157 /// C++0x divides the concept of "r-value" into pure r-values 158 /// ("pr-values") and so-called expiring values ("x-values"), which 159 /// identify specific objects that can be safely cannibalized for 160 /// their resources. This is an unfortunate abuse of terminology on 161 /// the part of the C++ committee. In Clang, when we say "r-value", 162 /// we generally mean a pr-value. 163 bool isLValue() const { return getValueKind() == VK_LValue; } 164 bool isRValue() const { return getValueKind() == VK_RValue; } 165 bool isXValue() const { return getValueKind() == VK_XValue; } 166 bool isGLValue() const { return getValueKind() != VK_RValue; } 167 168 enum LValueClassification { 169 LV_Valid, 170 LV_NotObjectType, 171 LV_IncompleteVoidType, 172 LV_DuplicateVectorComponents, 173 LV_InvalidExpression, 174 LV_MemberFunction, 175 LV_SubObjCPropertySetting, 176 LV_ClassTemporary 177 }; 178 /// Reasons why an expression might not be an l-value. 179 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 180 181 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 182 /// does not have an incomplete type, does not have a const-qualified type, 183 /// and if it is a structure or union, does not have any member (including, 184 /// recursively, any member or element of all contained aggregates or unions) 185 /// with a const-qualified type. 186 /// 187 /// \param Loc [in] [out] - A source location which *may* be filled 188 /// in with the location of the expression making this a 189 /// non-modifiable lvalue, if specified. 190 enum isModifiableLvalueResult { 191 MLV_Valid, 192 MLV_NotObjectType, 193 MLV_IncompleteVoidType, 194 MLV_DuplicateVectorComponents, 195 MLV_InvalidExpression, 196 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 197 MLV_IncompleteType, 198 MLV_ConstQualified, 199 MLV_ArrayType, 200 MLV_NotBlockQualified, 201 MLV_ReadonlyProperty, 202 MLV_NoSetterProperty, 203 MLV_MemberFunction, 204 MLV_SubObjCPropertySetting, 205 MLV_ClassTemporary 206 }; 207 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 208 SourceLocation *Loc = 0) const; 209 210 /// \brief The return type of classify(). Represents the C++0x expression 211 /// taxonomy. 212 class Classification { 213 public: 214 /// \brief The various classification results. Most of these mean prvalue. 215 enum Kinds { 216 CL_LValue, 217 CL_XValue, 218 CL_Function, // Functions cannot be lvalues in C. 219 CL_Void, // Void cannot be an lvalue in C. 220 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 221 CL_MemberFunction, // An expression referring to a member function 222 CL_SubObjCPropertySetting, 223 CL_ClassTemporary, // A prvalue of class type 224 CL_PRValue // A prvalue for any other reason, of any other type 225 }; 226 /// \brief The results of modification testing. 227 enum ModifiableType { 228 CM_Untested, // testModifiable was false. 229 CM_Modifiable, 230 CM_RValue, // Not modifiable because it's an rvalue 231 CM_Function, // Not modifiable because it's a function; C++ only 232 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 233 CM_NotBlockQualified, // Not captured in the closure 234 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 235 CM_ConstQualified, 236 CM_ArrayType, 237 CM_IncompleteType 238 }; 239 240 private: 241 friend class Expr; 242 243 unsigned short Kind; 244 unsigned short Modifiable; 245 246 explicit Classification(Kinds k, ModifiableType m) 247 : Kind(k), Modifiable(m) 248 {} 249 250 public: 251 Classification() {} 252 253 Kinds getKind() const { return static_cast<Kinds>(Kind); } 254 ModifiableType getModifiable() const { 255 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 256 return static_cast<ModifiableType>(Modifiable); 257 } 258 bool isLValue() const { return Kind == CL_LValue; } 259 bool isXValue() const { return Kind == CL_XValue; } 260 bool isGLValue() const { return Kind <= CL_XValue; } 261 bool isPRValue() const { return Kind >= CL_Function; } 262 bool isRValue() const { return Kind >= CL_XValue; } 263 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 264 265 /// \brief Create a simple, modifiably lvalue 266 static Classification makeSimpleLValue() { 267 return Classification(CL_LValue, CM_Modifiable); 268 } 269 270 }; 271 /// \brief Classify - Classify this expression according to the C++0x 272 /// expression taxonomy. 273 /// 274 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 275 /// old lvalue vs rvalue. This function determines the type of expression this 276 /// is. There are three expression types: 277 /// - lvalues are classical lvalues as in C++03. 278 /// - prvalues are equivalent to rvalues in C++03. 279 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 280 /// function returning an rvalue reference. 281 /// lvalues and xvalues are collectively referred to as glvalues, while 282 /// prvalues and xvalues together form rvalues. 283 Classification Classify(ASTContext &Ctx) const { 284 return ClassifyImpl(Ctx, 0); 285 } 286 287 /// \brief ClassifyModifiable - Classify this expression according to the 288 /// C++0x expression taxonomy, and see if it is valid on the left side 289 /// of an assignment. 290 /// 291 /// This function extends classify in that it also tests whether the 292 /// expression is modifiable (C99 6.3.2.1p1). 293 /// \param Loc A source location that might be filled with a relevant location 294 /// if the expression is not modifiable. 295 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 296 return ClassifyImpl(Ctx, &Loc); 297 } 298 299 /// getValueKindForType - Given a formal return or parameter type, 300 /// give its value kind. 301 static ExprValueKind getValueKindForType(QualType T) { 302 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 303 return (isa<LValueReferenceType>(RT) 304 ? VK_LValue 305 : (RT->getPointeeType()->isFunctionType() 306 ? VK_LValue : VK_XValue)); 307 return VK_RValue; 308 } 309 310 /// getValueKind - The value kind that this expression produces. 311 ExprValueKind getValueKind() const { 312 return static_cast<ExprValueKind>(ExprBits.ValueKind); 313 } 314 315 /// getObjectKind - The object kind that this expression produces. 316 /// Object kinds are meaningful only for expressions that yield an 317 /// l-value or x-value. 318 ExprObjectKind getObjectKind() const { 319 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 320 } 321 322 /// setValueKind - Set the value kind produced by this expression. 323 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 324 325 /// setObjectKind - Set the object kind produced by this expression. 326 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 327 328private: 329 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 330 331public: 332 333 /// \brief If this expression refers to a bit-field, retrieve the 334 /// declaration of that bit-field. 335 FieldDecl *getBitField(); 336 337 const FieldDecl *getBitField() const { 338 return const_cast<Expr*>(this)->getBitField(); 339 } 340 341 /// \brief If this expression is an l-value for an Objective C 342 /// property, find the underlying property reference expression. 343 const ObjCPropertyRefExpr *getObjCProperty() const; 344 345 /// \brief Returns whether this expression refers to a vector element. 346 bool refersToVectorElement() const; 347 348 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 349 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 350 /// but also int expressions which are produced by things like comparisons in 351 /// C. 352 bool isKnownToHaveBooleanValue() const; 353 354 /// isIntegerConstantExpr - Return true if this expression is a valid integer 355 /// constant expression, and, if so, return its value in Result. If not a 356 /// valid i-c-e, return false and fill in Loc (if specified) with the location 357 /// of the invalid expression. 358 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 359 SourceLocation *Loc = 0, 360 bool isEvaluated = true) const; 361 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 362 llvm::APSInt X; 363 return isIntegerConstantExpr(X, Ctx, Loc); 364 } 365 /// isConstantInitializer - Returns true if this expression is a constant 366 /// initializer, which can be emitted at compile-time. 367 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 368 369 /// EvalResult is a struct with detailed info about an evaluated expression. 370 struct EvalResult { 371 /// Val - This is the value the expression can be folded to. 372 APValue Val; 373 374 /// HasSideEffects - Whether the evaluated expression has side effects. 375 /// For example, (f() && 0) can be folded, but it still has side effects. 376 bool HasSideEffects; 377 378 /// Diag - If the expression is unfoldable, then Diag contains a note 379 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 380 /// position for the error, and DiagExpr is the expression that caused 381 /// the error. 382 /// If the expression is foldable, but not an integer constant expression, 383 /// Diag contains a note diagnostic that describes why it isn't an integer 384 /// constant expression. If the expression *is* an integer constant 385 /// expression, then Diag will be zero. 386 unsigned Diag; 387 const Expr *DiagExpr; 388 SourceLocation DiagLoc; 389 390 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 391 392 // isGlobalLValue - Return true if the evaluated lvalue expression 393 // is global. 394 bool isGlobalLValue() const; 395 // hasSideEffects - Return true if the evaluated expression has 396 // side effects. 397 bool hasSideEffects() const { 398 return HasSideEffects; 399 } 400 }; 401 402 /// Evaluate - Return true if this is a constant which we can fold using 403 /// any crazy technique (that has nothing to do with language standards) that 404 /// we want to. If this function returns true, it returns the folded constant 405 /// in Result. 406 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 407 408 /// EvaluateAsBooleanCondition - Return true if this is a constant 409 /// which we we can fold and convert to a boolean condition using 410 /// any crazy technique that we want to. 411 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 412 413 /// isEvaluatable - Call Evaluate to see if this expression can be constant 414 /// folded, but discard the result. 415 bool isEvaluatable(const ASTContext &Ctx) const; 416 417 /// HasSideEffects - This routine returns true for all those expressions 418 /// which must be evaluated each time and must not be optimized away 419 /// or evaluated at compile time. Example is a function call, volatile 420 /// variable read. 421 bool HasSideEffects(const ASTContext &Ctx) const; 422 423 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 424 /// must be called on an expression that constant folds to an integer. 425 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 426 427 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 428 /// with link time known address. 429 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 430 431 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 432 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 433 434 /// \brief Enumeration used to describe how \c isNullPointerConstant() 435 /// should cope with value-dependent expressions. 436 enum NullPointerConstantValueDependence { 437 /// \brief Specifies that the expression should never be value-dependent. 438 NPC_NeverValueDependent = 0, 439 440 /// \brief Specifies that a value-dependent expression of integral or 441 /// dependent type should be considered a null pointer constant. 442 NPC_ValueDependentIsNull, 443 444 /// \brief Specifies that a value-dependent expression should be considered 445 /// to never be a null pointer constant. 446 NPC_ValueDependentIsNotNull 447 }; 448 449 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 450 /// integer constant expression with the value zero, or if this is one that is 451 /// cast to void*. 452 bool isNullPointerConstant(ASTContext &Ctx, 453 NullPointerConstantValueDependence NPC) const; 454 455 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 456 /// write barrier. 457 bool isOBJCGCCandidate(ASTContext &Ctx) const; 458 459 /// \brief Returns true if this expression is a bound member function. 460 bool isBoundMemberFunction(ASTContext &Ctx) const; 461 462 /// \brief Result type of CanThrow(). 463 enum CanThrowResult { 464 CT_Cannot, 465 CT_Dependent, 466 CT_Can 467 }; 468 /// \brief Test if this expression, if evaluated, might throw, according to 469 /// the rules of C++ [expr.unary.noexcept]. 470 CanThrowResult CanThrow(ASTContext &C) const; 471 472 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 473 /// its subexpression. If that subexpression is also a ParenExpr, 474 /// then this method recursively returns its subexpression, and so forth. 475 /// Otherwise, the method returns the current Expr. 476 Expr *IgnoreParens(); 477 478 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 479 /// or CastExprs, returning their operand. 480 Expr *IgnoreParenCasts(); 481 482 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 483 /// ParenExpr or ImplicitCastExprs, returning their operand. 484 Expr *IgnoreParenImpCasts(); 485 486 const Expr *IgnoreParenImpCasts() const { 487 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 488 } 489 490 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 491 /// CastExprs that represent lvalue casts, returning their operand. 492 Expr *IgnoreParenLValueCasts(); 493 494 const Expr *IgnoreParenLValueCasts() const { 495 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 496 } 497 498 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 499 /// value (including ptr->int casts of the same size). Strip off any 500 /// ParenExpr or CastExprs, returning their operand. 501 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 502 503 /// \brief Determine whether this expression is a default function argument. 504 /// 505 /// Default arguments are implicitly generated in the abstract syntax tree 506 /// by semantic analysis for function calls, object constructions, etc. in 507 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 508 /// this routine also looks through any implicit casts to determine whether 509 /// the expression is a default argument. 510 bool isDefaultArgument() const; 511 512 /// \brief Determine whether the result of this expression is a 513 /// temporary object of the given class type. 514 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 515 516 const Expr *IgnoreParens() const { 517 return const_cast<Expr*>(this)->IgnoreParens(); 518 } 519 const Expr *IgnoreParenCasts() const { 520 return const_cast<Expr*>(this)->IgnoreParenCasts(); 521 } 522 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 523 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 524 } 525 526 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 527 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 528 529 static bool classof(const Stmt *T) { 530 return T->getStmtClass() >= firstExprConstant && 531 T->getStmtClass() <= lastExprConstant; 532 } 533 static bool classof(const Expr *) { return true; } 534}; 535 536 537//===----------------------------------------------------------------------===// 538// Primary Expressions. 539//===----------------------------------------------------------------------===// 540 541/// \brief Represents the qualifier that may precede a C++ name, e.g., the 542/// "std::" in "std::sort". 543struct NameQualifier { 544 /// \brief The nested name specifier. 545 NestedNameSpecifier *NNS; 546 547 /// \brief The source range covered by the nested name specifier. 548 SourceRange Range; 549}; 550 551/// \brief Represents an explicit template argument list in C++, e.g., 552/// the "<int>" in "sort<int>". 553struct ExplicitTemplateArgumentList { 554 /// \brief The source location of the left angle bracket ('<'); 555 SourceLocation LAngleLoc; 556 557 /// \brief The source location of the right angle bracket ('>'); 558 SourceLocation RAngleLoc; 559 560 /// \brief The number of template arguments in TemplateArgs. 561 /// The actual template arguments (if any) are stored after the 562 /// ExplicitTemplateArgumentList structure. 563 unsigned NumTemplateArgs; 564 565 /// \brief Retrieve the template arguments 566 TemplateArgumentLoc *getTemplateArgs() { 567 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 568 } 569 570 /// \brief Retrieve the template arguments 571 const TemplateArgumentLoc *getTemplateArgs() const { 572 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 573 } 574 575 void initializeFrom(const TemplateArgumentListInfo &List); 576 void initializeFrom(const TemplateArgumentListInfo &List, 577 bool &Dependent, bool &ContainsUnexpandedParameterPack); 578 void copyInto(TemplateArgumentListInfo &List) const; 579 static std::size_t sizeFor(unsigned NumTemplateArgs); 580 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 581}; 582 583/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 584/// enum, etc. 585class DeclRefExpr : public Expr { 586 enum { 587 // Flag on DecoratedD that specifies when this declaration reference 588 // expression has a C++ nested-name-specifier. 589 HasQualifierFlag = 0x01, 590 // Flag on DecoratedD that specifies when this declaration reference 591 // expression has an explicit C++ template argument list. 592 HasExplicitTemplateArgumentListFlag = 0x02 593 }; 594 595 // DecoratedD - The declaration that we are referencing, plus two bits to 596 // indicate whether (1) the declaration's name was explicitly qualified and 597 // (2) the declaration's name was followed by an explicit template 598 // argument list. 599 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 600 601 // Loc - The location of the declaration name itself. 602 SourceLocation Loc; 603 604 /// DNLoc - Provides source/type location info for the 605 /// declaration name embedded in DecoratedD. 606 DeclarationNameLoc DNLoc; 607 608 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 609 NameQualifier *getNameQualifier() { 610 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 611 return 0; 612 613 return reinterpret_cast<NameQualifier *> (this + 1); 614 } 615 616 /// \brief Retrieve the qualifier that preceded the member name, if any. 617 const NameQualifier *getNameQualifier() const { 618 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 619 } 620 621 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 622 ValueDecl *D, SourceLocation NameLoc, 623 const TemplateArgumentListInfo *TemplateArgs, 624 QualType T, ExprValueKind VK); 625 626 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 627 ValueDecl *D, const DeclarationNameInfo &NameInfo, 628 const TemplateArgumentListInfo *TemplateArgs, 629 QualType T, ExprValueKind VK); 630 631 /// \brief Construct an empty declaration reference expression. 632 explicit DeclRefExpr(EmptyShell Empty) 633 : Expr(DeclRefExprClass, Empty) { } 634 635 /// \brief Computes the type- and value-dependence flags for this 636 /// declaration reference expression. 637 void computeDependence(); 638 639public: 640 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 641 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 642 DecoratedD(d, 0), Loc(l) { 643 computeDependence(); 644 } 645 646 static DeclRefExpr *Create(ASTContext &Context, 647 NestedNameSpecifier *Qualifier, 648 SourceRange QualifierRange, 649 ValueDecl *D, 650 SourceLocation NameLoc, 651 QualType T, ExprValueKind VK, 652 const TemplateArgumentListInfo *TemplateArgs = 0); 653 654 static DeclRefExpr *Create(ASTContext &Context, 655 NestedNameSpecifier *Qualifier, 656 SourceRange QualifierRange, 657 ValueDecl *D, 658 const DeclarationNameInfo &NameInfo, 659 QualType T, ExprValueKind VK, 660 const TemplateArgumentListInfo *TemplateArgs = 0); 661 662 /// \brief Construct an empty declaration reference expression. 663 static DeclRefExpr *CreateEmpty(ASTContext &Context, 664 bool HasQualifier, 665 bool HasExplicitTemplateArgs, 666 unsigned NumTemplateArgs); 667 668 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 669 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 670 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 671 672 DeclarationNameInfo getNameInfo() const { 673 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 674 } 675 676 SourceLocation getLocation() const { return Loc; } 677 void setLocation(SourceLocation L) { Loc = L; } 678 SourceRange getSourceRange() const; 679 680 /// \brief Determine whether this declaration reference was preceded by a 681 /// C++ nested-name-specifier, e.g., \c N::foo. 682 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 683 684 /// \brief If the name was qualified, retrieves the source range of 685 /// the nested-name-specifier that precedes the name. Otherwise, 686 /// returns an empty source range. 687 SourceRange getQualifierRange() const { 688 if (!hasQualifier()) 689 return SourceRange(); 690 691 return getNameQualifier()->Range; 692 } 693 694 /// \brief If the name was qualified, retrieves the nested-name-specifier 695 /// that precedes the name. Otherwise, returns NULL. 696 NestedNameSpecifier *getQualifier() const { 697 if (!hasQualifier()) 698 return 0; 699 700 return getNameQualifier()->NNS; 701 } 702 703 bool hasExplicitTemplateArgs() const { 704 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 705 } 706 707 /// \brief Retrieve the explicit template argument list that followed the 708 /// member template name. 709 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 710 assert(hasExplicitTemplateArgs()); 711 712 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 713 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 714 715 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 716 getNameQualifier() + 1); 717 } 718 719 /// \brief Retrieve the explicit template argument list that followed the 720 /// member template name. 721 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 722 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 723 } 724 725 /// \brief Retrieves the optional explicit template arguments. 726 /// This points to the same data as getExplicitTemplateArgs(), but 727 /// returns null if there are no explicit template arguments. 728 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 729 if (!hasExplicitTemplateArgs()) return 0; 730 return &getExplicitTemplateArgs(); 731 } 732 733 /// \brief Copies the template arguments (if present) into the given 734 /// structure. 735 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 736 if (hasExplicitTemplateArgs()) 737 getExplicitTemplateArgs().copyInto(List); 738 } 739 740 /// \brief Retrieve the location of the left angle bracket following the 741 /// member name ('<'), if any. 742 SourceLocation getLAngleLoc() const { 743 if (!hasExplicitTemplateArgs()) 744 return SourceLocation(); 745 746 return getExplicitTemplateArgs().LAngleLoc; 747 } 748 749 /// \brief Retrieve the template arguments provided as part of this 750 /// template-id. 751 const TemplateArgumentLoc *getTemplateArgs() const { 752 if (!hasExplicitTemplateArgs()) 753 return 0; 754 755 return getExplicitTemplateArgs().getTemplateArgs(); 756 } 757 758 /// \brief Retrieve the number of template arguments provided as part of this 759 /// template-id. 760 unsigned getNumTemplateArgs() const { 761 if (!hasExplicitTemplateArgs()) 762 return 0; 763 764 return getExplicitTemplateArgs().NumTemplateArgs; 765 } 766 767 /// \brief Retrieve the location of the right angle bracket following the 768 /// template arguments ('>'). 769 SourceLocation getRAngleLoc() const { 770 if (!hasExplicitTemplateArgs()) 771 return SourceLocation(); 772 773 return getExplicitTemplateArgs().RAngleLoc; 774 } 775 776 static bool classof(const Stmt *T) { 777 return T->getStmtClass() == DeclRefExprClass; 778 } 779 static bool classof(const DeclRefExpr *) { return true; } 780 781 // Iterators 782 child_range children() { return child_range(); } 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 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 child_range children() { return child_range(); } 831}; 832 833/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 834/// leaking memory. 835/// 836/// For large floats/integers, APFloat/APInt will allocate memory from the heap 837/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 838/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 839/// the APFloat/APInt values will never get freed. APNumericStorage uses 840/// ASTContext's allocator for memory allocation. 841class APNumericStorage { 842 unsigned BitWidth; 843 union { 844 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 845 uint64_t *pVal; ///< Used to store the >64 bits integer value. 846 }; 847 848 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 849 850 APNumericStorage(const APNumericStorage&); // do not implement 851 APNumericStorage& operator=(const APNumericStorage&); // do not implement 852 853protected: 854 APNumericStorage() : BitWidth(0), VAL(0) { } 855 856 llvm::APInt getIntValue() const { 857 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 858 if (NumWords > 1) 859 return llvm::APInt(BitWidth, NumWords, pVal); 860 else 861 return llvm::APInt(BitWidth, VAL); 862 } 863 void setIntValue(ASTContext &C, const llvm::APInt &Val); 864}; 865 866class APIntStorage : public APNumericStorage { 867public: 868 llvm::APInt getValue() const { return getIntValue(); } 869 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 870}; 871 872class APFloatStorage : public APNumericStorage { 873public: 874 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 875 void setValue(ASTContext &C, const llvm::APFloat &Val) { 876 setIntValue(C, Val.bitcastToAPInt()); 877 } 878}; 879 880class IntegerLiteral : public Expr { 881 APIntStorage Num; 882 SourceLocation Loc; 883 884 /// \brief Construct an empty integer literal. 885 explicit IntegerLiteral(EmptyShell Empty) 886 : Expr(IntegerLiteralClass, Empty) { } 887 888public: 889 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 890 // or UnsignedLongLongTy 891 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 892 QualType type, SourceLocation l) 893 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 894 false), 895 Loc(l) { 896 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 897 setValue(C, V); 898 } 899 900 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 901 // or UnsignedLongLongTy 902 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 903 QualType type, SourceLocation l); 904 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 905 906 llvm::APInt getValue() const { return Num.getValue(); } 907 SourceRange getSourceRange() const { return SourceRange(Loc); } 908 909 /// \brief Retrieve the location of the literal. 910 SourceLocation getLocation() const { return Loc; } 911 912 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 913 void setLocation(SourceLocation Location) { Loc = Location; } 914 915 static bool classof(const Stmt *T) { 916 return T->getStmtClass() == IntegerLiteralClass; 917 } 918 static bool classof(const IntegerLiteral *) { return true; } 919 920 // Iterators 921 child_range children() { return child_range(); } 922}; 923 924class CharacterLiteral : public Expr { 925 unsigned Value; 926 SourceLocation Loc; 927 bool IsWide; 928public: 929 // type should be IntTy 930 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 931 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 932 false), 933 Value(value), Loc(l), IsWide(iswide) { 934 } 935 936 /// \brief Construct an empty character literal. 937 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 938 939 SourceLocation getLocation() const { return Loc; } 940 bool isWide() const { return IsWide; } 941 942 SourceRange getSourceRange() const { return SourceRange(Loc); } 943 944 unsigned getValue() const { return Value; } 945 946 void setLocation(SourceLocation Location) { Loc = Location; } 947 void setWide(bool W) { IsWide = W; } 948 void setValue(unsigned Val) { Value = Val; } 949 950 static bool classof(const Stmt *T) { 951 return T->getStmtClass() == CharacterLiteralClass; 952 } 953 static bool classof(const CharacterLiteral *) { return true; } 954 955 // Iterators 956 child_range children() { return child_range(); } 957}; 958 959class FloatingLiteral : public Expr { 960 APFloatStorage Num; 961 bool IsExact : 1; 962 SourceLocation Loc; 963 964 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 965 QualType Type, SourceLocation L) 966 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 967 false), 968 IsExact(isexact), Loc(L) { 969 setValue(C, V); 970 } 971 972 /// \brief Construct an empty floating-point literal. 973 explicit FloatingLiteral(EmptyShell Empty) 974 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 975 976public: 977 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 978 bool isexact, QualType Type, SourceLocation L); 979 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 980 981 llvm::APFloat getValue() const { return Num.getValue(); } 982 void setValue(ASTContext &C, const llvm::APFloat &Val) { 983 Num.setValue(C, Val); 984 } 985 986 bool isExact() const { return IsExact; } 987 void setExact(bool E) { IsExact = E; } 988 989 /// getValueAsApproximateDouble - This returns the value as an inaccurate 990 /// double. Note that this may cause loss of precision, but is useful for 991 /// debugging dumps, etc. 992 double getValueAsApproximateDouble() const; 993 994 SourceLocation getLocation() const { return Loc; } 995 void setLocation(SourceLocation L) { Loc = L; } 996 997 SourceRange getSourceRange() const { return SourceRange(Loc); } 998 999 static bool classof(const Stmt *T) { 1000 return T->getStmtClass() == FloatingLiteralClass; 1001 } 1002 static bool classof(const FloatingLiteral *) { return true; } 1003 1004 // Iterators 1005 child_range children() { return child_range(); } 1006}; 1007 1008/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1009/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1010/// IntegerLiteral classes. Instances of this class always have a Complex type 1011/// whose element type matches the subexpression. 1012/// 1013class ImaginaryLiteral : public Expr { 1014 Stmt *Val; 1015public: 1016 ImaginaryLiteral(Expr *val, QualType Ty) 1017 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1018 false), 1019 Val(val) {} 1020 1021 /// \brief Build an empty imaginary literal. 1022 explicit ImaginaryLiteral(EmptyShell Empty) 1023 : Expr(ImaginaryLiteralClass, Empty) { } 1024 1025 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1026 Expr *getSubExpr() { return cast<Expr>(Val); } 1027 void setSubExpr(Expr *E) { Val = E; } 1028 1029 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1030 static bool classof(const Stmt *T) { 1031 return T->getStmtClass() == ImaginaryLiteralClass; 1032 } 1033 static bool classof(const ImaginaryLiteral *) { return true; } 1034 1035 // Iterators 1036 child_range children() { return child_range(&Val, &Val+1); } 1037}; 1038 1039/// StringLiteral - This represents a string literal expression, e.g. "foo" 1040/// or L"bar" (wide strings). The actual string is returned by getStrData() 1041/// is NOT null-terminated, and the length of the string is determined by 1042/// calling getByteLength(). The C type for a string is always a 1043/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1044/// not. 1045/// 1046/// Note that strings in C can be formed by concatenation of multiple string 1047/// literal pptokens in translation phase #6. This keeps track of the locations 1048/// of each of these pieces. 1049/// 1050/// Strings in C can also be truncated and extended by assigning into arrays, 1051/// e.g. with constructs like: 1052/// char X[2] = "foobar"; 1053/// In this case, getByteLength() will return 6, but the string literal will 1054/// have type "char[2]". 1055class StringLiteral : public Expr { 1056 const char *StrData; 1057 unsigned ByteLength; 1058 bool IsWide; 1059 unsigned NumConcatenated; 1060 SourceLocation TokLocs[1]; 1061 1062 StringLiteral(QualType Ty) : 1063 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1064 1065public: 1066 /// This is the "fully general" constructor that allows representation of 1067 /// strings formed from multiple concatenated tokens. 1068 static StringLiteral *Create(ASTContext &C, const char *StrData, 1069 unsigned ByteLength, bool Wide, QualType Ty, 1070 const SourceLocation *Loc, unsigned NumStrs); 1071 1072 /// Simple constructor for string literals made from one token. 1073 static StringLiteral *Create(ASTContext &C, const char *StrData, 1074 unsigned ByteLength, 1075 bool Wide, QualType Ty, SourceLocation Loc) { 1076 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1077 } 1078 1079 /// \brief Construct an empty string literal. 1080 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1081 1082 llvm::StringRef getString() const { 1083 return llvm::StringRef(StrData, ByteLength); 1084 } 1085 1086 unsigned getByteLength() const { return ByteLength; } 1087 1088 /// \brief Sets the string data to the given string data. 1089 void setString(ASTContext &C, llvm::StringRef Str); 1090 1091 bool isWide() const { return IsWide; } 1092 void setWide(bool W) { IsWide = W; } 1093 1094 bool containsNonAsciiOrNull() const { 1095 llvm::StringRef Str = getString(); 1096 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1097 if (!isascii(Str[i]) || !Str[i]) 1098 return true; 1099 return false; 1100 } 1101 /// getNumConcatenated - Get the number of string literal tokens that were 1102 /// concatenated in translation phase #6 to form this string literal. 1103 unsigned getNumConcatenated() const { return NumConcatenated; } 1104 1105 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1106 assert(TokNum < NumConcatenated && "Invalid tok number"); 1107 return TokLocs[TokNum]; 1108 } 1109 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1110 assert(TokNum < NumConcatenated && "Invalid tok number"); 1111 TokLocs[TokNum] = L; 1112 } 1113 1114 /// getLocationOfByte - Return a source location that points to the specified 1115 /// byte of this string literal. 1116 /// 1117 /// Strings are amazingly complex. They can be formed from multiple tokens 1118 /// and can have escape sequences in them in addition to the usual trigraph 1119 /// and escaped newline business. This routine handles this complexity. 1120 /// 1121 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1122 const LangOptions &Features, 1123 const TargetInfo &Target) const; 1124 1125 typedef const SourceLocation *tokloc_iterator; 1126 tokloc_iterator tokloc_begin() const { return TokLocs; } 1127 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1128 1129 SourceRange getSourceRange() const { 1130 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1131 } 1132 static bool classof(const Stmt *T) { 1133 return T->getStmtClass() == StringLiteralClass; 1134 } 1135 static bool classof(const StringLiteral *) { return true; } 1136 1137 // Iterators 1138 child_range children() { return child_range(); } 1139}; 1140 1141/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1142/// AST node is only formed if full location information is requested. 1143class ParenExpr : public Expr { 1144 SourceLocation L, R; 1145 Stmt *Val; 1146public: 1147 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1148 : Expr(ParenExprClass, val->getType(), 1149 val->getValueKind(), val->getObjectKind(), 1150 val->isTypeDependent(), val->isValueDependent(), 1151 val->containsUnexpandedParameterPack()), 1152 L(l), R(r), Val(val) {} 1153 1154 /// \brief Construct an empty parenthesized expression. 1155 explicit ParenExpr(EmptyShell Empty) 1156 : Expr(ParenExprClass, Empty) { } 1157 1158 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1159 Expr *getSubExpr() { return cast<Expr>(Val); } 1160 void setSubExpr(Expr *E) { Val = E; } 1161 1162 SourceRange getSourceRange() const { return SourceRange(L, R); } 1163 1164 /// \brief Get the location of the left parentheses '('. 1165 SourceLocation getLParen() const { return L; } 1166 void setLParen(SourceLocation Loc) { L = Loc; } 1167 1168 /// \brief Get the location of the right parentheses ')'. 1169 SourceLocation getRParen() const { return R; } 1170 void setRParen(SourceLocation Loc) { R = Loc; } 1171 1172 static bool classof(const Stmt *T) { 1173 return T->getStmtClass() == ParenExprClass; 1174 } 1175 static bool classof(const ParenExpr *) { return true; } 1176 1177 // Iterators 1178 child_range children() { return child_range(&Val, &Val+1); } 1179}; 1180 1181 1182/// UnaryOperator - This represents the unary-expression's (except sizeof and 1183/// alignof), the postinc/postdec operators from postfix-expression, and various 1184/// extensions. 1185/// 1186/// Notes on various nodes: 1187/// 1188/// Real/Imag - These return the real/imag part of a complex operand. If 1189/// applied to a non-complex value, the former returns its operand and the 1190/// later returns zero in the type of the operand. 1191/// 1192class UnaryOperator : public Expr { 1193public: 1194 typedef UnaryOperatorKind Opcode; 1195 1196private: 1197 unsigned Opc : 5; 1198 SourceLocation Loc; 1199 Stmt *Val; 1200public: 1201 1202 UnaryOperator(Expr *input, Opcode opc, QualType type, 1203 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1204 : Expr(UnaryOperatorClass, type, VK, OK, 1205 input->isTypeDependent() || type->isDependentType(), 1206 input->isValueDependent(), 1207 input->containsUnexpandedParameterPack()), 1208 Opc(opc), Loc(l), Val(input) {} 1209 1210 /// \brief Build an empty unary operator. 1211 explicit UnaryOperator(EmptyShell Empty) 1212 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1213 1214 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1215 void setOpcode(Opcode O) { Opc = O; } 1216 1217 Expr *getSubExpr() const { return cast<Expr>(Val); } 1218 void setSubExpr(Expr *E) { Val = E; } 1219 1220 /// getOperatorLoc - Return the location of the operator. 1221 SourceLocation getOperatorLoc() const { return Loc; } 1222 void setOperatorLoc(SourceLocation L) { Loc = L; } 1223 1224 /// isPostfix - Return true if this is a postfix operation, like x++. 1225 static bool isPostfix(Opcode Op) { 1226 return Op == UO_PostInc || Op == UO_PostDec; 1227 } 1228 1229 /// isPrefix - Return true if this is a prefix operation, like --x. 1230 static bool isPrefix(Opcode Op) { 1231 return Op == UO_PreInc || Op == UO_PreDec; 1232 } 1233 1234 bool isPrefix() const { return isPrefix(getOpcode()); } 1235 bool isPostfix() const { return isPostfix(getOpcode()); } 1236 bool isIncrementOp() const { 1237 return Opc == UO_PreInc || Opc == UO_PostInc; 1238 } 1239 bool isIncrementDecrementOp() const { 1240 return Opc <= UO_PreDec; 1241 } 1242 static bool isArithmeticOp(Opcode Op) { 1243 return Op >= UO_Plus && Op <= UO_LNot; 1244 } 1245 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1246 1247 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1248 /// corresponds to, e.g. "sizeof" or "[pre]++" 1249 static const char *getOpcodeStr(Opcode Op); 1250 1251 /// \brief Retrieve the unary opcode that corresponds to the given 1252 /// overloaded operator. 1253 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1254 1255 /// \brief Retrieve the overloaded operator kind that corresponds to 1256 /// the given unary opcode. 1257 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1258 1259 SourceRange getSourceRange() const { 1260 if (isPostfix()) 1261 return SourceRange(Val->getLocStart(), Loc); 1262 else 1263 return SourceRange(Loc, Val->getLocEnd()); 1264 } 1265 SourceLocation getExprLoc() const { return Loc; } 1266 1267 static bool classof(const Stmt *T) { 1268 return T->getStmtClass() == UnaryOperatorClass; 1269 } 1270 static bool classof(const UnaryOperator *) { return true; } 1271 1272 // Iterators 1273 child_range children() { return child_range(&Val, &Val+1); } 1274}; 1275 1276/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1277/// offsetof(record-type, member-designator). For example, given: 1278/// @code 1279/// struct S { 1280/// float f; 1281/// double d; 1282/// }; 1283/// struct T { 1284/// int i; 1285/// struct S s[10]; 1286/// }; 1287/// @endcode 1288/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1289 1290class OffsetOfExpr : public Expr { 1291public: 1292 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1293 class OffsetOfNode { 1294 public: 1295 /// \brief The kind of offsetof node we have. 1296 enum Kind { 1297 /// \brief An index into an array. 1298 Array = 0x00, 1299 /// \brief A field. 1300 Field = 0x01, 1301 /// \brief A field in a dependent type, known only by its name. 1302 Identifier = 0x02, 1303 /// \brief An implicit indirection through a C++ base class, when the 1304 /// field found is in a base class. 1305 Base = 0x03 1306 }; 1307 1308 private: 1309 enum { MaskBits = 2, Mask = 0x03 }; 1310 1311 /// \brief The source range that covers this part of the designator. 1312 SourceRange Range; 1313 1314 /// \brief The data describing the designator, which comes in three 1315 /// different forms, depending on the lower two bits. 1316 /// - An unsigned index into the array of Expr*'s stored after this node 1317 /// in memory, for [constant-expression] designators. 1318 /// - A FieldDecl*, for references to a known field. 1319 /// - An IdentifierInfo*, for references to a field with a given name 1320 /// when the class type is dependent. 1321 /// - A CXXBaseSpecifier*, for references that look at a field in a 1322 /// base class. 1323 uintptr_t Data; 1324 1325 public: 1326 /// \brief Create an offsetof node that refers to an array element. 1327 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1328 SourceLocation RBracketLoc) 1329 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1330 1331 /// \brief Create an offsetof node that refers to a field. 1332 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1333 SourceLocation NameLoc) 1334 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1335 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1336 1337 /// \brief Create an offsetof node that refers to an identifier. 1338 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1339 SourceLocation NameLoc) 1340 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1341 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1342 1343 /// \brief Create an offsetof node that refers into a C++ base class. 1344 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1345 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1346 1347 /// \brief Determine what kind of offsetof node this is. 1348 Kind getKind() const { 1349 return static_cast<Kind>(Data & Mask); 1350 } 1351 1352 /// \brief For an array element node, returns the index into the array 1353 /// of expressions. 1354 unsigned getArrayExprIndex() const { 1355 assert(getKind() == Array); 1356 return Data >> 2; 1357 } 1358 1359 /// \brief For a field offsetof node, returns the field. 1360 FieldDecl *getField() const { 1361 assert(getKind() == Field); 1362 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1363 } 1364 1365 /// \brief For a field or identifier offsetof node, returns the name of 1366 /// the field. 1367 IdentifierInfo *getFieldName() const; 1368 1369 /// \brief For a base class node, returns the base specifier. 1370 CXXBaseSpecifier *getBase() const { 1371 assert(getKind() == Base); 1372 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1373 } 1374 1375 /// \brief Retrieve the source range that covers this offsetof node. 1376 /// 1377 /// For an array element node, the source range contains the locations of 1378 /// the square brackets. For a field or identifier node, the source range 1379 /// contains the location of the period (if there is one) and the 1380 /// identifier. 1381 SourceRange getRange() const { return Range; } 1382 }; 1383 1384private: 1385 1386 SourceLocation OperatorLoc, RParenLoc; 1387 // Base type; 1388 TypeSourceInfo *TSInfo; 1389 // Number of sub-components (i.e. instances of OffsetOfNode). 1390 unsigned NumComps; 1391 // Number of sub-expressions (i.e. array subscript expressions). 1392 unsigned NumExprs; 1393 1394 OffsetOfExpr(ASTContext &C, QualType type, 1395 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1396 OffsetOfNode* compsPtr, unsigned numComps, 1397 Expr** exprsPtr, unsigned numExprs, 1398 SourceLocation RParenLoc); 1399 1400 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1401 : Expr(OffsetOfExprClass, EmptyShell()), 1402 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1403 1404public: 1405 1406 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1407 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1408 OffsetOfNode* compsPtr, unsigned numComps, 1409 Expr** exprsPtr, unsigned numExprs, 1410 SourceLocation RParenLoc); 1411 1412 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1413 unsigned NumComps, unsigned NumExprs); 1414 1415 /// getOperatorLoc - Return the location of the operator. 1416 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1417 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1418 1419 /// \brief Return the location of the right parentheses. 1420 SourceLocation getRParenLoc() const { return RParenLoc; } 1421 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1422 1423 TypeSourceInfo *getTypeSourceInfo() const { 1424 return TSInfo; 1425 } 1426 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1427 TSInfo = tsi; 1428 } 1429 1430 const OffsetOfNode &getComponent(unsigned Idx) { 1431 assert(Idx < NumComps && "Subscript out of range"); 1432 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1433 } 1434 1435 void setComponent(unsigned Idx, OffsetOfNode ON) { 1436 assert(Idx < NumComps && "Subscript out of range"); 1437 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1438 } 1439 1440 unsigned getNumComponents() const { 1441 return NumComps; 1442 } 1443 1444 Expr* getIndexExpr(unsigned Idx) { 1445 assert(Idx < NumExprs && "Subscript out of range"); 1446 return reinterpret_cast<Expr **>( 1447 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1448 } 1449 1450 void setIndexExpr(unsigned Idx, Expr* E) { 1451 assert(Idx < NumComps && "Subscript out of range"); 1452 reinterpret_cast<Expr **>( 1453 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1454 } 1455 1456 unsigned getNumExpressions() const { 1457 return NumExprs; 1458 } 1459 1460 SourceRange getSourceRange() const { 1461 return SourceRange(OperatorLoc, RParenLoc); 1462 } 1463 1464 static bool classof(const Stmt *T) { 1465 return T->getStmtClass() == OffsetOfExprClass; 1466 } 1467 1468 static bool classof(const OffsetOfExpr *) { return true; } 1469 1470 // Iterators 1471 child_range children() { 1472 Stmt **begin = 1473 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1474 + NumComps); 1475 return child_range(begin, begin + NumExprs); 1476 } 1477}; 1478 1479/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1480/// types and expressions. 1481class SizeOfAlignOfExpr : public Expr { 1482 bool isSizeof : 1; // true if sizeof, false if alignof. 1483 bool isType : 1; // true if operand is a type, false if an expression 1484 union { 1485 TypeSourceInfo *Ty; 1486 Stmt *Ex; 1487 } Argument; 1488 SourceLocation OpLoc, RParenLoc; 1489 1490public: 1491 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1492 QualType resultType, SourceLocation op, 1493 SourceLocation rp) : 1494 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1495 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1496 // Value-dependent if the argument is type-dependent. 1497 TInfo->getType()->isDependentType(), 1498 TInfo->getType()->containsUnexpandedParameterPack()), 1499 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1500 Argument.Ty = TInfo; 1501 } 1502 1503 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1504 QualType resultType, SourceLocation op, 1505 SourceLocation rp) : 1506 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1507 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1508 // Value-dependent if the argument is type-dependent. 1509 E->isTypeDependent(), 1510 E->containsUnexpandedParameterPack()), 1511 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1512 Argument.Ex = E; 1513 } 1514 1515 /// \brief Construct an empty sizeof/alignof expression. 1516 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1517 : Expr(SizeOfAlignOfExprClass, Empty) { } 1518 1519 bool isSizeOf() const { return isSizeof; } 1520 void setSizeof(bool S) { isSizeof = S; } 1521 1522 bool isArgumentType() const { return isType; } 1523 QualType getArgumentType() const { 1524 return getArgumentTypeInfo()->getType(); 1525 } 1526 TypeSourceInfo *getArgumentTypeInfo() const { 1527 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1528 return Argument.Ty; 1529 } 1530 Expr *getArgumentExpr() { 1531 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1532 return static_cast<Expr*>(Argument.Ex); 1533 } 1534 const Expr *getArgumentExpr() const { 1535 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1536 } 1537 1538 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1539 void setArgument(TypeSourceInfo *TInfo) { 1540 Argument.Ty = TInfo; 1541 isType = true; 1542 } 1543 1544 /// Gets the argument type, or the type of the argument expression, whichever 1545 /// is appropriate. 1546 QualType getTypeOfArgument() const { 1547 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1548 } 1549 1550 SourceLocation getOperatorLoc() const { return OpLoc; } 1551 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1552 1553 SourceLocation getRParenLoc() const { return RParenLoc; } 1554 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1555 1556 SourceRange getSourceRange() const { 1557 return SourceRange(OpLoc, RParenLoc); 1558 } 1559 1560 static bool classof(const Stmt *T) { 1561 return T->getStmtClass() == SizeOfAlignOfExprClass; 1562 } 1563 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1564 1565 // Iterators 1566 child_range children(); 1567}; 1568 1569//===----------------------------------------------------------------------===// 1570// Postfix Operators. 1571//===----------------------------------------------------------------------===// 1572 1573/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1574class ArraySubscriptExpr : public Expr { 1575 enum { LHS, RHS, END_EXPR=2 }; 1576 Stmt* SubExprs[END_EXPR]; 1577 SourceLocation RBracketLoc; 1578public: 1579 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1580 ExprValueKind VK, ExprObjectKind OK, 1581 SourceLocation rbracketloc) 1582 : Expr(ArraySubscriptExprClass, t, VK, OK, 1583 lhs->isTypeDependent() || rhs->isTypeDependent(), 1584 lhs->isValueDependent() || rhs->isValueDependent(), 1585 (lhs->containsUnexpandedParameterPack() || 1586 rhs->containsUnexpandedParameterPack())), 1587 RBracketLoc(rbracketloc) { 1588 SubExprs[LHS] = lhs; 1589 SubExprs[RHS] = rhs; 1590 } 1591 1592 /// \brief Create an empty array subscript expression. 1593 explicit ArraySubscriptExpr(EmptyShell Shell) 1594 : Expr(ArraySubscriptExprClass, Shell) { } 1595 1596 /// An array access can be written A[4] or 4[A] (both are equivalent). 1597 /// - getBase() and getIdx() always present the normalized view: A[4]. 1598 /// In this case getBase() returns "A" and getIdx() returns "4". 1599 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1600 /// 4[A] getLHS() returns "4". 1601 /// Note: Because vector element access is also written A[4] we must 1602 /// predicate the format conversion in getBase and getIdx only on the 1603 /// the type of the RHS, as it is possible for the LHS to be a vector of 1604 /// integer type 1605 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1606 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1607 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1608 1609 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1610 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1611 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1612 1613 Expr *getBase() { 1614 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1615 } 1616 1617 const Expr *getBase() const { 1618 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1619 } 1620 1621 Expr *getIdx() { 1622 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1623 } 1624 1625 const Expr *getIdx() const { 1626 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1627 } 1628 1629 SourceRange getSourceRange() const { 1630 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1631 } 1632 1633 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1634 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1635 1636 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1637 1638 static bool classof(const Stmt *T) { 1639 return T->getStmtClass() == ArraySubscriptExprClass; 1640 } 1641 static bool classof(const ArraySubscriptExpr *) { return true; } 1642 1643 // Iterators 1644 child_range children() { 1645 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1646 } 1647}; 1648 1649 1650/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1651/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1652/// while its subclasses may represent alternative syntax that (semantically) 1653/// results in a function call. For example, CXXOperatorCallExpr is 1654/// a subclass for overloaded operator calls that use operator syntax, e.g., 1655/// "str1 + str2" to resolve to a function call. 1656class CallExpr : public Expr { 1657 enum { FN=0, PREARGS_START=1 }; 1658 Stmt **SubExprs; 1659 unsigned NumArgs; 1660 SourceLocation RParenLoc; 1661 1662protected: 1663 // These versions of the constructor are for derived classes. 1664 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1665 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1666 SourceLocation rparenloc); 1667 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1668 1669 Stmt *getPreArg(unsigned i) { 1670 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1671 return SubExprs[PREARGS_START+i]; 1672 } 1673 const Stmt *getPreArg(unsigned i) const { 1674 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1675 return SubExprs[PREARGS_START+i]; 1676 } 1677 void setPreArg(unsigned i, Stmt *PreArg) { 1678 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1679 SubExprs[PREARGS_START+i] = PreArg; 1680 } 1681 1682 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1683 1684public: 1685 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1686 ExprValueKind VK, SourceLocation rparenloc); 1687 1688 /// \brief Build an empty call expression. 1689 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1690 1691 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1692 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1693 void setCallee(Expr *F) { SubExprs[FN] = F; } 1694 1695 Decl *getCalleeDecl(); 1696 const Decl *getCalleeDecl() const { 1697 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1698 } 1699 1700 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1701 FunctionDecl *getDirectCallee(); 1702 const FunctionDecl *getDirectCallee() const { 1703 return const_cast<CallExpr*>(this)->getDirectCallee(); 1704 } 1705 1706 /// getNumArgs - Return the number of actual arguments to this call. 1707 /// 1708 unsigned getNumArgs() const { return NumArgs; } 1709 1710 /// \brief Retrieve the call arguments. 1711 Expr **getArgs() { 1712 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1713 } 1714 1715 /// getArg - Return the specified argument. 1716 Expr *getArg(unsigned Arg) { 1717 assert(Arg < NumArgs && "Arg access out of range!"); 1718 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1719 } 1720 const Expr *getArg(unsigned Arg) const { 1721 assert(Arg < NumArgs && "Arg access out of range!"); 1722 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1723 } 1724 1725 /// setArg - Set the specified argument. 1726 void setArg(unsigned Arg, Expr *ArgExpr) { 1727 assert(Arg < NumArgs && "Arg access out of range!"); 1728 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1729 } 1730 1731 /// setNumArgs - This changes the number of arguments present in this call. 1732 /// Any orphaned expressions are deleted by this, and any new operands are set 1733 /// to null. 1734 void setNumArgs(ASTContext& C, unsigned NumArgs); 1735 1736 typedef ExprIterator arg_iterator; 1737 typedef ConstExprIterator const_arg_iterator; 1738 1739 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1740 arg_iterator arg_end() { 1741 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1742 } 1743 const_arg_iterator arg_begin() const { 1744 return SubExprs+PREARGS_START+getNumPreArgs(); 1745 } 1746 const_arg_iterator arg_end() const { 1747 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1748 } 1749 1750 /// getNumCommas - Return the number of commas that must have been present in 1751 /// this function call. 1752 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1753 1754 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1755 /// not, return 0. 1756 unsigned isBuiltinCall(const ASTContext &Context) const; 1757 1758 /// getCallReturnType - Get the return type of the call expr. This is not 1759 /// always the type of the expr itself, if the return type is a reference 1760 /// type. 1761 QualType getCallReturnType() const; 1762 1763 SourceLocation getRParenLoc() const { return RParenLoc; } 1764 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1765 1766 SourceRange getSourceRange() const { 1767 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1768 } 1769 1770 static bool classof(const Stmt *T) { 1771 return T->getStmtClass() >= firstCallExprConstant && 1772 T->getStmtClass() <= lastCallExprConstant; 1773 } 1774 static bool classof(const CallExpr *) { return true; } 1775 1776 // Iterators 1777 child_range children() { 1778 return child_range(&SubExprs[0], 1779 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1780 } 1781}; 1782 1783/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1784/// 1785class MemberExpr : public Expr { 1786 /// Extra data stored in some member expressions. 1787 struct MemberNameQualifier : public NameQualifier { 1788 DeclAccessPair FoundDecl; 1789 }; 1790 1791 /// Base - the expression for the base pointer or structure references. In 1792 /// X.F, this is "X". 1793 Stmt *Base; 1794 1795 /// MemberDecl - This is the decl being referenced by the field/member name. 1796 /// In X.F, this is the decl referenced by F. 1797 ValueDecl *MemberDecl; 1798 1799 /// MemberLoc - This is the location of the member name. 1800 SourceLocation MemberLoc; 1801 1802 /// MemberDNLoc - Provides source/type location info for the 1803 /// declaration name embedded in MemberDecl. 1804 DeclarationNameLoc MemberDNLoc; 1805 1806 /// IsArrow - True if this is "X->F", false if this is "X.F". 1807 bool IsArrow : 1; 1808 1809 /// \brief True if this member expression used a nested-name-specifier to 1810 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1811 /// declaration. When true, a MemberNameQualifier 1812 /// structure is allocated immediately after the MemberExpr. 1813 bool HasQualifierOrFoundDecl : 1; 1814 1815 /// \brief True if this member expression specified a template argument list 1816 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1817 /// structure (and its TemplateArguments) are allocated immediately after 1818 /// the MemberExpr or, if the member expression also has a qualifier, after 1819 /// the MemberNameQualifier structure. 1820 bool HasExplicitTemplateArgumentList : 1; 1821 1822 /// \brief Retrieve the qualifier that preceded the member name, if any. 1823 MemberNameQualifier *getMemberQualifier() { 1824 assert(HasQualifierOrFoundDecl); 1825 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1826 } 1827 1828 /// \brief Retrieve the qualifier that preceded the member name, if any. 1829 const MemberNameQualifier *getMemberQualifier() const { 1830 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1831 } 1832 1833public: 1834 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1835 const DeclarationNameInfo &NameInfo, QualType ty, 1836 ExprValueKind VK, ExprObjectKind OK) 1837 : Expr(MemberExprClass, ty, VK, OK, 1838 base->isTypeDependent(), base->isValueDependent(), 1839 base->containsUnexpandedParameterPack()), 1840 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1841 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1842 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1843 assert(memberdecl->getDeclName() == NameInfo.getName()); 1844 } 1845 1846 // NOTE: this constructor should be used only when it is known that 1847 // the member name can not provide additional syntactic info 1848 // (i.e., source locations for C++ operator names or type source info 1849 // for constructors, destructors and conversion oeprators). 1850 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1851 SourceLocation l, QualType ty, 1852 ExprValueKind VK, ExprObjectKind OK) 1853 : Expr(MemberExprClass, ty, VK, OK, 1854 base->isTypeDependent(), base->isValueDependent(), 1855 base->containsUnexpandedParameterPack()), 1856 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1857 IsArrow(isarrow), 1858 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1859 1860 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1861 NestedNameSpecifier *qual, SourceRange qualrange, 1862 ValueDecl *memberdecl, DeclAccessPair founddecl, 1863 DeclarationNameInfo MemberNameInfo, 1864 const TemplateArgumentListInfo *targs, 1865 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1866 1867 void setBase(Expr *E) { Base = E; } 1868 Expr *getBase() const { return cast<Expr>(Base); } 1869 1870 /// \brief Retrieve the member declaration to which this expression refers. 1871 /// 1872 /// The returned declaration will either be a FieldDecl or (in C++) 1873 /// a CXXMethodDecl. 1874 ValueDecl *getMemberDecl() const { return MemberDecl; } 1875 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1876 1877 /// \brief Retrieves the declaration found by lookup. 1878 DeclAccessPair getFoundDecl() const { 1879 if (!HasQualifierOrFoundDecl) 1880 return DeclAccessPair::make(getMemberDecl(), 1881 getMemberDecl()->getAccess()); 1882 return getMemberQualifier()->FoundDecl; 1883 } 1884 1885 /// \brief Determines whether this member expression actually had 1886 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1887 /// x->Base::foo. 1888 bool hasQualifier() const { return getQualifier() != 0; } 1889 1890 /// \brief If the member name was qualified, retrieves the source range of 1891 /// the nested-name-specifier that precedes the member name. Otherwise, 1892 /// returns an empty source range. 1893 SourceRange getQualifierRange() const { 1894 if (!HasQualifierOrFoundDecl) 1895 return SourceRange(); 1896 1897 return getMemberQualifier()->Range; 1898 } 1899 1900 /// \brief If the member name was qualified, retrieves the 1901 /// nested-name-specifier that precedes the member name. Otherwise, returns 1902 /// NULL. 1903 NestedNameSpecifier *getQualifier() const { 1904 if (!HasQualifierOrFoundDecl) 1905 return 0; 1906 1907 return getMemberQualifier()->NNS; 1908 } 1909 1910 /// \brief Determines whether this member expression actually had a C++ 1911 /// template argument list explicitly specified, e.g., x.f<int>. 1912 bool hasExplicitTemplateArgs() const { 1913 return HasExplicitTemplateArgumentList; 1914 } 1915 1916 /// \brief Copies the template arguments (if present) into the given 1917 /// structure. 1918 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1919 if (hasExplicitTemplateArgs()) 1920 getExplicitTemplateArgs().copyInto(List); 1921 } 1922 1923 /// \brief Retrieve the explicit template argument list that 1924 /// follow the member template name. This must only be called on an 1925 /// expression with explicit template arguments. 1926 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1927 assert(HasExplicitTemplateArgumentList); 1928 if (!HasQualifierOrFoundDecl) 1929 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1930 1931 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1932 getMemberQualifier() + 1); 1933 } 1934 1935 /// \brief Retrieve the explicit template argument list that 1936 /// followed the member template name. This must only be called on 1937 /// an expression with explicit template arguments. 1938 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1939 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1940 } 1941 1942 /// \brief Retrieves the optional explicit template arguments. 1943 /// This points to the same data as getExplicitTemplateArgs(), but 1944 /// returns null if there are no explicit template arguments. 1945 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1946 if (!hasExplicitTemplateArgs()) return 0; 1947 return &getExplicitTemplateArgs(); 1948 } 1949 1950 /// \brief Retrieve the location of the left angle bracket following the 1951 /// member name ('<'), if any. 1952 SourceLocation getLAngleLoc() const { 1953 if (!HasExplicitTemplateArgumentList) 1954 return SourceLocation(); 1955 1956 return getExplicitTemplateArgs().LAngleLoc; 1957 } 1958 1959 /// \brief Retrieve the template arguments provided as part of this 1960 /// template-id. 1961 const TemplateArgumentLoc *getTemplateArgs() const { 1962 if (!HasExplicitTemplateArgumentList) 1963 return 0; 1964 1965 return getExplicitTemplateArgs().getTemplateArgs(); 1966 } 1967 1968 /// \brief Retrieve the number of template arguments provided as part of this 1969 /// template-id. 1970 unsigned getNumTemplateArgs() const { 1971 if (!HasExplicitTemplateArgumentList) 1972 return 0; 1973 1974 return getExplicitTemplateArgs().NumTemplateArgs; 1975 } 1976 1977 /// \brief Retrieve the location of the right angle bracket following the 1978 /// template arguments ('>'). 1979 SourceLocation getRAngleLoc() const { 1980 if (!HasExplicitTemplateArgumentList) 1981 return SourceLocation(); 1982 1983 return getExplicitTemplateArgs().RAngleLoc; 1984 } 1985 1986 /// \brief Retrieve the member declaration name info. 1987 DeclarationNameInfo getMemberNameInfo() const { 1988 return DeclarationNameInfo(MemberDecl->getDeclName(), 1989 MemberLoc, MemberDNLoc); 1990 } 1991 1992 bool isArrow() const { return IsArrow; } 1993 void setArrow(bool A) { IsArrow = A; } 1994 1995 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1996 /// location of 'F'. 1997 SourceLocation getMemberLoc() const { return MemberLoc; } 1998 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1999 2000 SourceRange getSourceRange() const { 2001 // If we have an implicit base (like a C++ implicit this), 2002 // make sure not to return its location 2003 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 2004 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 2005 2006 SourceLocation BaseLoc = getBase()->getLocStart(); 2007 if (BaseLoc.isInvalid()) 2008 return SourceRange(MemberLoc, EndLoc); 2009 return SourceRange(BaseLoc, EndLoc); 2010 } 2011 2012 SourceLocation getExprLoc() const { return MemberLoc; } 2013 2014 static bool classof(const Stmt *T) { 2015 return T->getStmtClass() == MemberExprClass; 2016 } 2017 static bool classof(const MemberExpr *) { return true; } 2018 2019 // Iterators 2020 child_range children() { return child_range(&Base, &Base+1); } 2021 2022 friend class ASTReader; 2023 friend class ASTStmtWriter; 2024}; 2025 2026/// CompoundLiteralExpr - [C99 6.5.2.5] 2027/// 2028class CompoundLiteralExpr : public Expr { 2029 /// LParenLoc - If non-null, this is the location of the left paren in a 2030 /// compound literal like "(int){4}". This can be null if this is a 2031 /// synthesized compound expression. 2032 SourceLocation LParenLoc; 2033 2034 /// The type as written. This can be an incomplete array type, in 2035 /// which case the actual expression type will be different. 2036 TypeSourceInfo *TInfo; 2037 Stmt *Init; 2038 bool FileScope; 2039public: 2040 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2041 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2042 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2043 tinfo->getType()->isDependentType(), 2044 init->isValueDependent(), 2045 init->containsUnexpandedParameterPack()), 2046 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2047 2048 /// \brief Construct an empty compound literal. 2049 explicit CompoundLiteralExpr(EmptyShell Empty) 2050 : Expr(CompoundLiteralExprClass, Empty) { } 2051 2052 const Expr *getInitializer() const { return cast<Expr>(Init); } 2053 Expr *getInitializer() { return cast<Expr>(Init); } 2054 void setInitializer(Expr *E) { Init = E; } 2055 2056 bool isFileScope() const { return FileScope; } 2057 void setFileScope(bool FS) { FileScope = FS; } 2058 2059 SourceLocation getLParenLoc() const { return LParenLoc; } 2060 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2061 2062 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2063 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2064 2065 SourceRange getSourceRange() const { 2066 // FIXME: Init should never be null. 2067 if (!Init) 2068 return SourceRange(); 2069 if (LParenLoc.isInvalid()) 2070 return Init->getSourceRange(); 2071 return SourceRange(LParenLoc, Init->getLocEnd()); 2072 } 2073 2074 static bool classof(const Stmt *T) { 2075 return T->getStmtClass() == CompoundLiteralExprClass; 2076 } 2077 static bool classof(const CompoundLiteralExpr *) { return true; } 2078 2079 // Iterators 2080 child_range children() { return child_range(&Init, &Init+1); } 2081}; 2082 2083/// CastExpr - Base class for type casts, including both implicit 2084/// casts (ImplicitCastExpr) and explicit casts that have some 2085/// representation in the source code (ExplicitCastExpr's derived 2086/// classes). 2087class CastExpr : public Expr { 2088public: 2089 typedef clang::CastKind CastKind; 2090 2091private: 2092 Stmt *Op; 2093 2094 void CheckCastConsistency() const { 2095#ifndef NDEBUG 2096 switch (getCastKind()) { 2097 case CK_DerivedToBase: 2098 case CK_UncheckedDerivedToBase: 2099 case CK_DerivedToBaseMemberPointer: 2100 case CK_BaseToDerived: 2101 case CK_BaseToDerivedMemberPointer: 2102 assert(!path_empty() && "Cast kind should have a base path!"); 2103 break; 2104 2105 // These should not have an inheritance path. 2106 case CK_BitCast: 2107 case CK_Dynamic: 2108 case CK_ToUnion: 2109 case CK_ArrayToPointerDecay: 2110 case CK_FunctionToPointerDecay: 2111 case CK_NullToMemberPointer: 2112 case CK_NullToPointer: 2113 case CK_ConstructorConversion: 2114 case CK_IntegralToPointer: 2115 case CK_PointerToIntegral: 2116 case CK_ToVoid: 2117 case CK_VectorSplat: 2118 case CK_IntegralCast: 2119 case CK_IntegralToFloating: 2120 case CK_FloatingToIntegral: 2121 case CK_FloatingCast: 2122 case CK_AnyPointerToObjCPointerCast: 2123 case CK_AnyPointerToBlockPointerCast: 2124 case CK_ObjCObjectLValueCast: 2125 case CK_FloatingRealToComplex: 2126 case CK_FloatingComplexToReal: 2127 case CK_FloatingComplexCast: 2128 case CK_FloatingComplexToIntegralComplex: 2129 case CK_IntegralRealToComplex: 2130 case CK_IntegralComplexToReal: 2131 case CK_IntegralComplexCast: 2132 case CK_IntegralComplexToFloatingComplex: 2133 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2134 // fallthrough to check for null base path 2135 2136 case CK_Dependent: 2137 case CK_LValueToRValue: 2138 case CK_GetObjCProperty: 2139 case CK_NoOp: 2140 case CK_PointerToBoolean: 2141 case CK_IntegralToBoolean: 2142 case CK_FloatingToBoolean: 2143 case CK_MemberPointerToBoolean: 2144 case CK_FloatingComplexToBoolean: 2145 case CK_IntegralComplexToBoolean: 2146 case CK_LValueBitCast: // -> bool& 2147 case CK_UserDefinedConversion: // operator bool() 2148 assert(path_empty() && "Cast kind should not have a base path!"); 2149 break; 2150 } 2151#endif 2152 } 2153 2154 const CXXBaseSpecifier * const *path_buffer() const { 2155 return const_cast<CastExpr*>(this)->path_buffer(); 2156 } 2157 CXXBaseSpecifier **path_buffer(); 2158 2159protected: 2160 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2161 const CastKind kind, Expr *op, unsigned BasePathSize) : 2162 Expr(SC, ty, VK, OK_Ordinary, 2163 // Cast expressions are type-dependent if the type is 2164 // dependent (C++ [temp.dep.expr]p3). 2165 ty->isDependentType(), 2166 // Cast expressions are value-dependent if the type is 2167 // dependent or if the subexpression is value-dependent. 2168 ty->isDependentType() || (op && op->isValueDependent()), 2169 (ty->containsUnexpandedParameterPack() || 2170 op->containsUnexpandedParameterPack())), 2171 Op(op) { 2172 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2173 CastExprBits.Kind = kind; 2174 CastExprBits.BasePathSize = BasePathSize; 2175 CheckCastConsistency(); 2176 } 2177 2178 /// \brief Construct an empty cast. 2179 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2180 : Expr(SC, Empty) { 2181 CastExprBits.BasePathSize = BasePathSize; 2182 } 2183 2184public: 2185 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2186 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2187 const char *getCastKindName() const; 2188 2189 Expr *getSubExpr() { return cast<Expr>(Op); } 2190 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2191 void setSubExpr(Expr *E) { Op = E; } 2192 2193 /// \brief Retrieve the cast subexpression as it was written in the source 2194 /// code, looking through any implicit casts or other intermediate nodes 2195 /// introduced by semantic analysis. 2196 Expr *getSubExprAsWritten(); 2197 const Expr *getSubExprAsWritten() const { 2198 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2199 } 2200 2201 typedef CXXBaseSpecifier **path_iterator; 2202 typedef const CXXBaseSpecifier * const *path_const_iterator; 2203 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2204 unsigned path_size() const { return CastExprBits.BasePathSize; } 2205 path_iterator path_begin() { return path_buffer(); } 2206 path_iterator path_end() { return path_buffer() + path_size(); } 2207 path_const_iterator path_begin() const { return path_buffer(); } 2208 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2209 2210 void setCastPath(const CXXCastPath &Path); 2211 2212 static bool classof(const Stmt *T) { 2213 return T->getStmtClass() >= firstCastExprConstant && 2214 T->getStmtClass() <= lastCastExprConstant; 2215 } 2216 static bool classof(const CastExpr *) { return true; } 2217 2218 // Iterators 2219 child_range children() { return child_range(&Op, &Op+1); } 2220}; 2221 2222/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2223/// conversions, which have no direct representation in the original 2224/// source code. For example: converting T[]->T*, void f()->void 2225/// (*f)(), float->double, short->int, etc. 2226/// 2227/// In C, implicit casts always produce rvalues. However, in C++, an 2228/// implicit cast whose result is being bound to a reference will be 2229/// an lvalue or xvalue. For example: 2230/// 2231/// @code 2232/// class Base { }; 2233/// class Derived : public Base { }; 2234/// Derived &&ref(); 2235/// void f(Derived d) { 2236/// Base& b = d; // initializer is an ImplicitCastExpr 2237/// // to an lvalue of type Base 2238/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2239/// // to an xvalue of type Base 2240/// } 2241/// @endcode 2242class ImplicitCastExpr : public CastExpr { 2243private: 2244 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2245 unsigned BasePathLength, ExprValueKind VK) 2246 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2247 } 2248 2249 /// \brief Construct an empty implicit cast. 2250 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2251 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2252 2253public: 2254 enum OnStack_t { OnStack }; 2255 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2256 ExprValueKind VK) 2257 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2258 } 2259 2260 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2261 CastKind Kind, Expr *Operand, 2262 const CXXCastPath *BasePath, 2263 ExprValueKind Cat); 2264 2265 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2266 2267 SourceRange getSourceRange() const { 2268 return getSubExpr()->getSourceRange(); 2269 } 2270 2271 static bool classof(const Stmt *T) { 2272 return T->getStmtClass() == ImplicitCastExprClass; 2273 } 2274 static bool classof(const ImplicitCastExpr *) { return true; } 2275}; 2276 2277/// ExplicitCastExpr - An explicit cast written in the source 2278/// code. 2279/// 2280/// This class is effectively an abstract class, because it provides 2281/// the basic representation of an explicitly-written cast without 2282/// specifying which kind of cast (C cast, functional cast, static 2283/// cast, etc.) was written; specific derived classes represent the 2284/// particular style of cast and its location information. 2285/// 2286/// Unlike implicit casts, explicit cast nodes have two different 2287/// types: the type that was written into the source code, and the 2288/// actual type of the expression as determined by semantic 2289/// analysis. These types may differ slightly. For example, in C++ one 2290/// can cast to a reference type, which indicates that the resulting 2291/// expression will be an lvalue or xvalue. The reference type, however, 2292/// will not be used as the type of the expression. 2293class ExplicitCastExpr : public CastExpr { 2294 /// TInfo - Source type info for the (written) type 2295 /// this expression is casting to. 2296 TypeSourceInfo *TInfo; 2297 2298protected: 2299 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2300 CastKind kind, Expr *op, unsigned PathSize, 2301 TypeSourceInfo *writtenTy) 2302 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2303 2304 /// \brief Construct an empty explicit cast. 2305 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2306 : CastExpr(SC, Shell, PathSize) { } 2307 2308public: 2309 /// getTypeInfoAsWritten - Returns the type source info for the type 2310 /// that this expression is casting to. 2311 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2312 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2313 2314 /// getTypeAsWritten - Returns the type that this expression is 2315 /// casting to, as written in the source code. 2316 QualType getTypeAsWritten() const { return TInfo->getType(); } 2317 2318 static bool classof(const Stmt *T) { 2319 return T->getStmtClass() >= firstExplicitCastExprConstant && 2320 T->getStmtClass() <= lastExplicitCastExprConstant; 2321 } 2322 static bool classof(const ExplicitCastExpr *) { return true; } 2323}; 2324 2325/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2326/// cast in C++ (C++ [expr.cast]), which uses the syntax 2327/// (Type)expr. For example: @c (int)f. 2328class CStyleCastExpr : public ExplicitCastExpr { 2329 SourceLocation LPLoc; // the location of the left paren 2330 SourceLocation RPLoc; // the location of the right paren 2331 2332 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2333 unsigned PathSize, TypeSourceInfo *writtenTy, 2334 SourceLocation l, SourceLocation r) 2335 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2336 writtenTy), LPLoc(l), RPLoc(r) {} 2337 2338 /// \brief Construct an empty C-style explicit cast. 2339 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2340 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2341 2342public: 2343 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2344 ExprValueKind VK, CastKind K, 2345 Expr *Op, const CXXCastPath *BasePath, 2346 TypeSourceInfo *WrittenTy, SourceLocation L, 2347 SourceLocation R); 2348 2349 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2350 2351 SourceLocation getLParenLoc() const { return LPLoc; } 2352 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2353 2354 SourceLocation getRParenLoc() const { return RPLoc; } 2355 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2356 2357 SourceRange getSourceRange() const { 2358 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2359 } 2360 static bool classof(const Stmt *T) { 2361 return T->getStmtClass() == CStyleCastExprClass; 2362 } 2363 static bool classof(const CStyleCastExpr *) { return true; } 2364}; 2365 2366/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2367/// 2368/// This expression node kind describes a builtin binary operation, 2369/// such as "x + y" for integer values "x" and "y". The operands will 2370/// already have been converted to appropriate types (e.g., by 2371/// performing promotions or conversions). 2372/// 2373/// In C++, where operators may be overloaded, a different kind of 2374/// expression node (CXXOperatorCallExpr) is used to express the 2375/// invocation of an overloaded operator with operator syntax. Within 2376/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2377/// used to store an expression "x + y" depends on the subexpressions 2378/// for x and y. If neither x or y is type-dependent, and the "+" 2379/// operator resolves to a built-in operation, BinaryOperator will be 2380/// used to express the computation (x and y may still be 2381/// value-dependent). If either x or y is type-dependent, or if the 2382/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2383/// be used to express the computation. 2384class BinaryOperator : public Expr { 2385public: 2386 typedef BinaryOperatorKind Opcode; 2387 2388private: 2389 unsigned Opc : 6; 2390 SourceLocation OpLoc; 2391 2392 enum { LHS, RHS, END_EXPR }; 2393 Stmt* SubExprs[END_EXPR]; 2394public: 2395 2396 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2397 ExprValueKind VK, ExprObjectKind OK, 2398 SourceLocation opLoc) 2399 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2400 lhs->isTypeDependent() || rhs->isTypeDependent(), 2401 lhs->isValueDependent() || rhs->isValueDependent(), 2402 (lhs->containsUnexpandedParameterPack() || 2403 rhs->containsUnexpandedParameterPack())), 2404 Opc(opc), OpLoc(opLoc) { 2405 SubExprs[LHS] = lhs; 2406 SubExprs[RHS] = rhs; 2407 assert(!isCompoundAssignmentOp() && 2408 "Use ArithAssignBinaryOperator for compound assignments"); 2409 } 2410 2411 /// \brief Construct an empty binary operator. 2412 explicit BinaryOperator(EmptyShell Empty) 2413 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2414 2415 SourceLocation getOperatorLoc() const { return OpLoc; } 2416 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2417 2418 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2419 void setOpcode(Opcode O) { Opc = O; } 2420 2421 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2422 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2423 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2424 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2425 2426 SourceRange getSourceRange() const { 2427 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2428 } 2429 2430 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2431 /// corresponds to, e.g. "<<=". 2432 static const char *getOpcodeStr(Opcode Op); 2433 2434 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2435 2436 /// \brief Retrieve the binary opcode that corresponds to the given 2437 /// overloaded operator. 2438 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2439 2440 /// \brief Retrieve the overloaded operator kind that corresponds to 2441 /// the given binary opcode. 2442 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2443 2444 /// predicates to categorize the respective opcodes. 2445 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2446 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2447 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2448 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2449 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2450 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2451 2452 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2453 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2454 2455 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2456 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2457 2458 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2459 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2460 2461 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2462 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2463 2464 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2465 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2466 2467 static bool isAssignmentOp(Opcode Opc) { 2468 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2469 } 2470 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2471 2472 static bool isCompoundAssignmentOp(Opcode Opc) { 2473 return Opc > BO_Assign && Opc <= BO_OrAssign; 2474 } 2475 bool isCompoundAssignmentOp() const { 2476 return isCompoundAssignmentOp(getOpcode()); 2477 } 2478 2479 static bool isShiftAssignOp(Opcode Opc) { 2480 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2481 } 2482 bool isShiftAssignOp() const { 2483 return isShiftAssignOp(getOpcode()); 2484 } 2485 2486 static bool classof(const Stmt *S) { 2487 return S->getStmtClass() >= firstBinaryOperatorConstant && 2488 S->getStmtClass() <= lastBinaryOperatorConstant; 2489 } 2490 static bool classof(const BinaryOperator *) { return true; } 2491 2492 // Iterators 2493 child_range children() { 2494 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2495 } 2496 2497protected: 2498 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2499 ExprValueKind VK, ExprObjectKind OK, 2500 SourceLocation opLoc, bool dead) 2501 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2502 lhs->isTypeDependent() || rhs->isTypeDependent(), 2503 lhs->isValueDependent() || rhs->isValueDependent(), 2504 (lhs->containsUnexpandedParameterPack() || 2505 rhs->containsUnexpandedParameterPack())), 2506 Opc(opc), OpLoc(opLoc) { 2507 SubExprs[LHS] = lhs; 2508 SubExprs[RHS] = rhs; 2509 } 2510 2511 BinaryOperator(StmtClass SC, EmptyShell Empty) 2512 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2513}; 2514 2515/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2516/// track of the type the operation is performed in. Due to the semantics of 2517/// these operators, the operands are promoted, the aritmetic performed, an 2518/// implicit conversion back to the result type done, then the assignment takes 2519/// place. This captures the intermediate type which the computation is done 2520/// in. 2521class CompoundAssignOperator : public BinaryOperator { 2522 QualType ComputationLHSType; 2523 QualType ComputationResultType; 2524public: 2525 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2526 ExprValueKind VK, ExprObjectKind OK, 2527 QualType CompLHSType, QualType CompResultType, 2528 SourceLocation OpLoc) 2529 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2530 ComputationLHSType(CompLHSType), 2531 ComputationResultType(CompResultType) { 2532 assert(isCompoundAssignmentOp() && 2533 "Only should be used for compound assignments"); 2534 } 2535 2536 /// \brief Build an empty compound assignment operator expression. 2537 explicit CompoundAssignOperator(EmptyShell Empty) 2538 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2539 2540 // The two computation types are the type the LHS is converted 2541 // to for the computation and the type of the result; the two are 2542 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2543 QualType getComputationLHSType() const { return ComputationLHSType; } 2544 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2545 2546 QualType getComputationResultType() const { return ComputationResultType; } 2547 void setComputationResultType(QualType T) { ComputationResultType = T; } 2548 2549 static bool classof(const CompoundAssignOperator *) { return true; } 2550 static bool classof(const Stmt *S) { 2551 return S->getStmtClass() == CompoundAssignOperatorClass; 2552 } 2553}; 2554 2555/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2556/// GNU "missing LHS" extension is in use. 2557/// 2558class ConditionalOperator : public Expr { 2559 enum { COND, LHS, RHS, END_EXPR }; 2560 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2561 Stmt* Save; 2562 SourceLocation QuestionLoc, ColonLoc; 2563public: 2564 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2565 SourceLocation CLoc, Expr *rhs, Expr *save, 2566 QualType t, ExprValueKind VK, ExprObjectKind OK) 2567 : Expr(ConditionalOperatorClass, t, VK, OK, 2568 // FIXME: the type of the conditional operator doesn't 2569 // depend on the type of the conditional, but the standard 2570 // seems to imply that it could. File a bug! 2571 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2572 (cond->isValueDependent() || 2573 (lhs && lhs->isValueDependent()) || 2574 (rhs && rhs->isValueDependent())), 2575 (cond->containsUnexpandedParameterPack() || 2576 (lhs && lhs->containsUnexpandedParameterPack()) || 2577 (rhs && rhs->containsUnexpandedParameterPack()))), 2578 QuestionLoc(QLoc), 2579 ColonLoc(CLoc) { 2580 SubExprs[COND] = cond; 2581 SubExprs[LHS] = lhs; 2582 SubExprs[RHS] = rhs; 2583 Save = save; 2584 } 2585 2586 /// \brief Build an empty conditional operator. 2587 explicit ConditionalOperator(EmptyShell Empty) 2588 : Expr(ConditionalOperatorClass, Empty) { } 2589 2590 // getCond - Return the expression representing the condition for 2591 // the ?: operator. 2592 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2593 void setCond(Expr *E) { SubExprs[COND] = E; } 2594 2595 // getTrueExpr - Return the subexpression representing the value of the ?: 2596 // expression if the condition evaluates to true. 2597 Expr *getTrueExpr() const { 2598 return cast<Expr>(SubExprs[LHS]); 2599 } 2600 2601 // getFalseExpr - Return the subexpression representing the value of the ?: 2602 // expression if the condition evaluates to false. This is the same as getRHS. 2603 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2604 2605 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2606 // allows the left subexpression to be omitted, and instead of that condition 2607 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2608 // expression "x" is only evaluated once. Under this senario, this function 2609 // returns the original, non-converted condition expression for the ?:operator 2610 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2611 2612 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2613 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2614 2615 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2616 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2617 2618 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2619 void setSAVE(Expr *E) { Save = E; } 2620 2621 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2622 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2623 2624 SourceLocation getColonLoc() const { return ColonLoc; } 2625 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2626 2627 SourceRange getSourceRange() const { 2628 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2629 } 2630 static bool classof(const Stmt *T) { 2631 return T->getStmtClass() == ConditionalOperatorClass; 2632 } 2633 static bool classof(const ConditionalOperator *) { return true; } 2634 2635 // Iterators 2636 child_range children() { 2637 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2638 } 2639}; 2640 2641/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2642class AddrLabelExpr : public Expr { 2643 SourceLocation AmpAmpLoc, LabelLoc; 2644 LabelStmt *Label; 2645public: 2646 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2647 QualType t) 2648 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2649 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2650 2651 /// \brief Build an empty address of a label expression. 2652 explicit AddrLabelExpr(EmptyShell Empty) 2653 : Expr(AddrLabelExprClass, Empty) { } 2654 2655 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2656 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2657 SourceLocation getLabelLoc() const { return LabelLoc; } 2658 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2659 2660 SourceRange getSourceRange() const { 2661 return SourceRange(AmpAmpLoc, LabelLoc); 2662 } 2663 2664 LabelStmt *getLabel() const { return Label; } 2665 void setLabel(LabelStmt *S) { Label = S; } 2666 2667 static bool classof(const Stmt *T) { 2668 return T->getStmtClass() == AddrLabelExprClass; 2669 } 2670 static bool classof(const AddrLabelExpr *) { return true; } 2671 2672 // Iterators 2673 child_range children() { return child_range(); } 2674}; 2675 2676/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2677/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2678/// takes the value of the last subexpression. 2679/// 2680/// A StmtExpr is always an r-value; values "returned" out of a 2681/// StmtExpr will be copied. 2682class StmtExpr : public Expr { 2683 Stmt *SubStmt; 2684 SourceLocation LParenLoc, RParenLoc; 2685public: 2686 // FIXME: Does type-dependence need to be computed differently? 2687 StmtExpr(CompoundStmt *substmt, QualType T, 2688 SourceLocation lp, SourceLocation rp) : 2689 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2690 T->isDependentType(), false, false), 2691 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2692 2693 /// \brief Build an empty statement expression. 2694 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2695 2696 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2697 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2698 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2699 2700 SourceRange getSourceRange() const { 2701 return SourceRange(LParenLoc, RParenLoc); 2702 } 2703 2704 SourceLocation getLParenLoc() const { return LParenLoc; } 2705 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2706 SourceLocation getRParenLoc() const { return RParenLoc; } 2707 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2708 2709 static bool classof(const Stmt *T) { 2710 return T->getStmtClass() == StmtExprClass; 2711 } 2712 static bool classof(const StmtExpr *) { return true; } 2713 2714 // Iterators 2715 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2716}; 2717 2718 2719/// ShuffleVectorExpr - clang-specific builtin-in function 2720/// __builtin_shufflevector. 2721/// This AST node represents a operator that does a constant 2722/// shuffle, similar to LLVM's shufflevector instruction. It takes 2723/// two vectors and a variable number of constant indices, 2724/// and returns the appropriately shuffled vector. 2725class ShuffleVectorExpr : public Expr { 2726 SourceLocation BuiltinLoc, RParenLoc; 2727 2728 // SubExprs - the list of values passed to the __builtin_shufflevector 2729 // function. The first two are vectors, and the rest are constant 2730 // indices. The number of values in this list is always 2731 // 2+the number of indices in the vector type. 2732 Stmt **SubExprs; 2733 unsigned NumExprs; 2734 2735public: 2736 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2737 QualType Type, SourceLocation BLoc, 2738 SourceLocation RP); 2739 2740 /// \brief Build an empty vector-shuffle expression. 2741 explicit ShuffleVectorExpr(EmptyShell Empty) 2742 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2743 2744 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2745 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2746 2747 SourceLocation getRParenLoc() const { return RParenLoc; } 2748 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2749 2750 SourceRange getSourceRange() const { 2751 return SourceRange(BuiltinLoc, RParenLoc); 2752 } 2753 static bool classof(const Stmt *T) { 2754 return T->getStmtClass() == ShuffleVectorExprClass; 2755 } 2756 static bool classof(const ShuffleVectorExpr *) { return true; } 2757 2758 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2759 /// constant expression, the actual arguments passed in, and the function 2760 /// pointers. 2761 unsigned getNumSubExprs() const { return NumExprs; } 2762 2763 /// \brief Retrieve the array of expressions. 2764 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2765 2766 /// getExpr - Return the Expr at the specified index. 2767 Expr *getExpr(unsigned Index) { 2768 assert((Index < NumExprs) && "Arg access out of range!"); 2769 return cast<Expr>(SubExprs[Index]); 2770 } 2771 const Expr *getExpr(unsigned Index) const { 2772 assert((Index < NumExprs) && "Arg access out of range!"); 2773 return cast<Expr>(SubExprs[Index]); 2774 } 2775 2776 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2777 2778 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2779 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2780 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2781 } 2782 2783 // Iterators 2784 child_range children() { 2785 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 2786 } 2787}; 2788 2789/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2790/// This AST node is similar to the conditional operator (?:) in C, with 2791/// the following exceptions: 2792/// - the test expression must be a integer constant expression. 2793/// - the expression returned acts like the chosen subexpression in every 2794/// visible way: the type is the same as that of the chosen subexpression, 2795/// and all predicates (whether it's an l-value, whether it's an integer 2796/// constant expression, etc.) return the same result as for the chosen 2797/// sub-expression. 2798class ChooseExpr : public Expr { 2799 enum { COND, LHS, RHS, END_EXPR }; 2800 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2801 SourceLocation BuiltinLoc, RParenLoc; 2802public: 2803 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2804 QualType t, ExprValueKind VK, ExprObjectKind OK, 2805 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2806 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 2807 (cond->containsUnexpandedParameterPack() || 2808 lhs->containsUnexpandedParameterPack() || 2809 rhs->containsUnexpandedParameterPack())), 2810 BuiltinLoc(BLoc), RParenLoc(RP) { 2811 SubExprs[COND] = cond; 2812 SubExprs[LHS] = lhs; 2813 SubExprs[RHS] = rhs; 2814 } 2815 2816 /// \brief Build an empty __builtin_choose_expr. 2817 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2818 2819 /// isConditionTrue - Return whether the condition is true (i.e. not 2820 /// equal to zero). 2821 bool isConditionTrue(const ASTContext &C) const; 2822 2823 /// getChosenSubExpr - Return the subexpression chosen according to the 2824 /// condition. 2825 Expr *getChosenSubExpr(const ASTContext &C) const { 2826 return isConditionTrue(C) ? getLHS() : getRHS(); 2827 } 2828 2829 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2830 void setCond(Expr *E) { SubExprs[COND] = E; } 2831 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2832 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2833 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2834 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2835 2836 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2837 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2838 2839 SourceLocation getRParenLoc() const { return RParenLoc; } 2840 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2841 2842 SourceRange getSourceRange() const { 2843 return SourceRange(BuiltinLoc, RParenLoc); 2844 } 2845 static bool classof(const Stmt *T) { 2846 return T->getStmtClass() == ChooseExprClass; 2847 } 2848 static bool classof(const ChooseExpr *) { return true; } 2849 2850 // Iterators 2851 child_range children() { 2852 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2853 } 2854}; 2855 2856/// GNUNullExpr - Implements the GNU __null extension, which is a name 2857/// for a null pointer constant that has integral type (e.g., int or 2858/// long) and is the same size and alignment as a pointer. The __null 2859/// extension is typically only used by system headers, which define 2860/// NULL as __null in C++ rather than using 0 (which is an integer 2861/// that may not match the size of a pointer). 2862class GNUNullExpr : public Expr { 2863 /// TokenLoc - The location of the __null keyword. 2864 SourceLocation TokenLoc; 2865 2866public: 2867 GNUNullExpr(QualType Ty, SourceLocation Loc) 2868 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 2869 TokenLoc(Loc) { } 2870 2871 /// \brief Build an empty GNU __null expression. 2872 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2873 2874 /// getTokenLocation - The location of the __null token. 2875 SourceLocation getTokenLocation() const { return TokenLoc; } 2876 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2877 2878 SourceRange getSourceRange() const { 2879 return SourceRange(TokenLoc); 2880 } 2881 static bool classof(const Stmt *T) { 2882 return T->getStmtClass() == GNUNullExprClass; 2883 } 2884 static bool classof(const GNUNullExpr *) { return true; } 2885 2886 // Iterators 2887 child_range children() { return child_range(); } 2888}; 2889 2890/// VAArgExpr, used for the builtin function __builtin_va_arg. 2891class VAArgExpr : public Expr { 2892 Stmt *Val; 2893 TypeSourceInfo *TInfo; 2894 SourceLocation BuiltinLoc, RParenLoc; 2895public: 2896 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2897 SourceLocation RPLoc, QualType t) 2898 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 2899 t->isDependentType(), false, 2900 (TInfo->getType()->containsUnexpandedParameterPack() || 2901 e->containsUnexpandedParameterPack())), 2902 Val(e), TInfo(TInfo), 2903 BuiltinLoc(BLoc), 2904 RParenLoc(RPLoc) { } 2905 2906 /// \brief Create an empty __builtin_va_arg expression. 2907 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2908 2909 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2910 Expr *getSubExpr() { return cast<Expr>(Val); } 2911 void setSubExpr(Expr *E) { Val = E; } 2912 2913 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2914 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2915 2916 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2917 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2918 2919 SourceLocation getRParenLoc() const { return RParenLoc; } 2920 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2921 2922 SourceRange getSourceRange() const { 2923 return SourceRange(BuiltinLoc, RParenLoc); 2924 } 2925 static bool classof(const Stmt *T) { 2926 return T->getStmtClass() == VAArgExprClass; 2927 } 2928 static bool classof(const VAArgExpr *) { return true; } 2929 2930 // Iterators 2931 child_range children() { return child_range(&Val, &Val+1); } 2932}; 2933 2934/// @brief Describes an C or C++ initializer list. 2935/// 2936/// InitListExpr describes an initializer list, which can be used to 2937/// initialize objects of different types, including 2938/// struct/class/union types, arrays, and vectors. For example: 2939/// 2940/// @code 2941/// struct foo x = { 1, { 2, 3 } }; 2942/// @endcode 2943/// 2944/// Prior to semantic analysis, an initializer list will represent the 2945/// initializer list as written by the user, but will have the 2946/// placeholder type "void". This initializer list is called the 2947/// syntactic form of the initializer, and may contain C99 designated 2948/// initializers (represented as DesignatedInitExprs), initializations 2949/// of subobject members without explicit braces, and so on. Clients 2950/// interested in the original syntax of the initializer list should 2951/// use the syntactic form of the initializer list. 2952/// 2953/// After semantic analysis, the initializer list will represent the 2954/// semantic form of the initializer, where the initializations of all 2955/// subobjects are made explicit with nested InitListExpr nodes and 2956/// C99 designators have been eliminated by placing the designated 2957/// initializations into the subobject they initialize. Additionally, 2958/// any "holes" in the initialization, where no initializer has been 2959/// specified for a particular subobject, will be replaced with 2960/// implicitly-generated ImplicitValueInitExpr expressions that 2961/// value-initialize the subobjects. Note, however, that the 2962/// initializer lists may still have fewer initializers than there are 2963/// elements to initialize within the object. 2964/// 2965/// Given the semantic form of the initializer list, one can retrieve 2966/// the original syntactic form of that initializer list (if it 2967/// exists) using getSyntacticForm(). Since many initializer lists 2968/// have the same syntactic and semantic forms, getSyntacticForm() may 2969/// return NULL, indicating that the current initializer list also 2970/// serves as its syntactic form. 2971class InitListExpr : public Expr { 2972 // FIXME: Eliminate this vector in favor of ASTContext allocation 2973 typedef ASTVector<Stmt *> InitExprsTy; 2974 InitExprsTy InitExprs; 2975 SourceLocation LBraceLoc, RBraceLoc; 2976 2977 /// Contains the initializer list that describes the syntactic form 2978 /// written in the source code. 2979 InitListExpr *SyntacticForm; 2980 2981 /// If this initializer list initializes a union, specifies which 2982 /// field within the union will be initialized. 2983 FieldDecl *UnionFieldInit; 2984 2985 /// Whether this initializer list originally had a GNU array-range 2986 /// designator in it. This is a temporary marker used by CodeGen. 2987 bool HadArrayRangeDesignator; 2988 2989public: 2990 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2991 Expr **initexprs, unsigned numinits, 2992 SourceLocation rbraceloc); 2993 2994 /// \brief Build an empty initializer list. 2995 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2996 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2997 2998 unsigned getNumInits() const { return InitExprs.size(); } 2999 3000 /// \brief Retrieve the set of initializers. 3001 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3002 3003 const Expr *getInit(unsigned Init) const { 3004 assert(Init < getNumInits() && "Initializer access out of range!"); 3005 return cast_or_null<Expr>(InitExprs[Init]); 3006 } 3007 3008 Expr *getInit(unsigned Init) { 3009 assert(Init < getNumInits() && "Initializer access out of range!"); 3010 return cast_or_null<Expr>(InitExprs[Init]); 3011 } 3012 3013 void setInit(unsigned Init, Expr *expr) { 3014 assert(Init < getNumInits() && "Initializer access out of range!"); 3015 InitExprs[Init] = expr; 3016 } 3017 3018 /// \brief Reserve space for some number of initializers. 3019 void reserveInits(ASTContext &C, unsigned NumInits); 3020 3021 /// @brief Specify the number of initializers 3022 /// 3023 /// If there are more than @p NumInits initializers, the remaining 3024 /// initializers will be destroyed. If there are fewer than @p 3025 /// NumInits initializers, NULL expressions will be added for the 3026 /// unknown initializers. 3027 void resizeInits(ASTContext &Context, unsigned NumInits); 3028 3029 /// @brief Updates the initializer at index @p Init with the new 3030 /// expression @p expr, and returns the old expression at that 3031 /// location. 3032 /// 3033 /// When @p Init is out of range for this initializer list, the 3034 /// initializer list will be extended with NULL expressions to 3035 /// accomodate the new entry. 3036 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3037 3038 /// \brief If this initializes a union, specifies which field in the 3039 /// union to initialize. 3040 /// 3041 /// Typically, this field is the first named field within the 3042 /// union. However, a designated initializer can specify the 3043 /// initialization of a different field within the union. 3044 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 3045 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 3046 3047 // Explicit InitListExpr's originate from source code (and have valid source 3048 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3049 bool isExplicit() { 3050 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3051 } 3052 3053 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3054 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3055 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3056 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3057 3058 /// @brief Retrieve the initializer list that describes the 3059 /// syntactic form of the initializer. 3060 /// 3061 /// 3062 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3063 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3064 3065 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3066 void sawArrayRangeDesignator(bool ARD = true) { 3067 HadArrayRangeDesignator = ARD; 3068 } 3069 3070 SourceRange getSourceRange() const; 3071 3072 static bool classof(const Stmt *T) { 3073 return T->getStmtClass() == InitListExprClass; 3074 } 3075 static bool classof(const InitListExpr *) { return true; } 3076 3077 // Iterators 3078 child_range children() { 3079 if (InitExprs.empty()) return child_range(); 3080 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3081 } 3082 3083 typedef InitExprsTy::iterator iterator; 3084 typedef InitExprsTy::const_iterator const_iterator; 3085 typedef InitExprsTy::reverse_iterator reverse_iterator; 3086 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3087 3088 iterator begin() { return InitExprs.begin(); } 3089 const_iterator begin() const { return InitExprs.begin(); } 3090 iterator end() { return InitExprs.end(); } 3091 const_iterator end() const { return InitExprs.end(); } 3092 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3093 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3094 reverse_iterator rend() { return InitExprs.rend(); } 3095 const_reverse_iterator rend() const { return InitExprs.rend(); } 3096}; 3097 3098/// @brief Represents a C99 designated initializer expression. 3099/// 3100/// A designated initializer expression (C99 6.7.8) contains one or 3101/// more designators (which can be field designators, array 3102/// designators, or GNU array-range designators) followed by an 3103/// expression that initializes the field or element(s) that the 3104/// designators refer to. For example, given: 3105/// 3106/// @code 3107/// struct point { 3108/// double x; 3109/// double y; 3110/// }; 3111/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3112/// @endcode 3113/// 3114/// The InitListExpr contains three DesignatedInitExprs, the first of 3115/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3116/// designators, one array designator for @c [2] followed by one field 3117/// designator for @c .y. The initalization expression will be 1.0. 3118class DesignatedInitExpr : public Expr { 3119public: 3120 /// \brief Forward declaration of the Designator class. 3121 class Designator; 3122 3123private: 3124 /// The location of the '=' or ':' prior to the actual initializer 3125 /// expression. 3126 SourceLocation EqualOrColonLoc; 3127 3128 /// Whether this designated initializer used the GNU deprecated 3129 /// syntax rather than the C99 '=' syntax. 3130 bool GNUSyntax : 1; 3131 3132 /// The number of designators in this initializer expression. 3133 unsigned NumDesignators : 15; 3134 3135 /// \brief The designators in this designated initialization 3136 /// expression. 3137 Designator *Designators; 3138 3139 /// The number of subexpressions of this initializer expression, 3140 /// which contains both the initializer and any additional 3141 /// expressions used by array and array-range designators. 3142 unsigned NumSubExprs : 16; 3143 3144 3145 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3146 const Designator *Designators, 3147 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3148 Expr **IndexExprs, unsigned NumIndexExprs, 3149 Expr *Init); 3150 3151 explicit DesignatedInitExpr(unsigned NumSubExprs) 3152 : Expr(DesignatedInitExprClass, EmptyShell()), 3153 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3154 3155public: 3156 /// A field designator, e.g., ".x". 3157 struct FieldDesignator { 3158 /// Refers to the field that is being initialized. The low bit 3159 /// of this field determines whether this is actually a pointer 3160 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3161 /// initially constructed, a field designator will store an 3162 /// IdentifierInfo*. After semantic analysis has resolved that 3163 /// name, the field designator will instead store a FieldDecl*. 3164 uintptr_t NameOrField; 3165 3166 /// The location of the '.' in the designated initializer. 3167 unsigned DotLoc; 3168 3169 /// The location of the field name in the designated initializer. 3170 unsigned FieldLoc; 3171 }; 3172 3173 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3174 struct ArrayOrRangeDesignator { 3175 /// Location of the first index expression within the designated 3176 /// initializer expression's list of subexpressions. 3177 unsigned Index; 3178 /// The location of the '[' starting the array range designator. 3179 unsigned LBracketLoc; 3180 /// The location of the ellipsis separating the start and end 3181 /// indices. Only valid for GNU array-range designators. 3182 unsigned EllipsisLoc; 3183 /// The location of the ']' terminating the array range designator. 3184 unsigned RBracketLoc; 3185 }; 3186 3187 /// @brief Represents a single C99 designator. 3188 /// 3189 /// @todo This class is infuriatingly similar to clang::Designator, 3190 /// but minor differences (storing indices vs. storing pointers) 3191 /// keep us from reusing it. Try harder, later, to rectify these 3192 /// differences. 3193 class Designator { 3194 /// @brief The kind of designator this describes. 3195 enum { 3196 FieldDesignator, 3197 ArrayDesignator, 3198 ArrayRangeDesignator 3199 } Kind; 3200 3201 union { 3202 /// A field designator, e.g., ".x". 3203 struct FieldDesignator Field; 3204 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3205 struct ArrayOrRangeDesignator ArrayOrRange; 3206 }; 3207 friend class DesignatedInitExpr; 3208 3209 public: 3210 Designator() {} 3211 3212 /// @brief Initializes a field designator. 3213 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3214 SourceLocation FieldLoc) 3215 : Kind(FieldDesignator) { 3216 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3217 Field.DotLoc = DotLoc.getRawEncoding(); 3218 Field.FieldLoc = FieldLoc.getRawEncoding(); 3219 } 3220 3221 /// @brief Initializes an array designator. 3222 Designator(unsigned Index, SourceLocation LBracketLoc, 3223 SourceLocation RBracketLoc) 3224 : Kind(ArrayDesignator) { 3225 ArrayOrRange.Index = Index; 3226 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3227 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3228 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3229 } 3230 3231 /// @brief Initializes a GNU array-range designator. 3232 Designator(unsigned Index, SourceLocation LBracketLoc, 3233 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3234 : Kind(ArrayRangeDesignator) { 3235 ArrayOrRange.Index = Index; 3236 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3237 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3238 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3239 } 3240 3241 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3242 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3243 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3244 3245 IdentifierInfo * getFieldName(); 3246 3247 FieldDecl *getField() { 3248 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3249 if (Field.NameOrField & 0x01) 3250 return 0; 3251 else 3252 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3253 } 3254 3255 void setField(FieldDecl *FD) { 3256 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3257 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3258 } 3259 3260 SourceLocation getDotLoc() const { 3261 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3262 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3263 } 3264 3265 SourceLocation getFieldLoc() const { 3266 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3267 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3268 } 3269 3270 SourceLocation getLBracketLoc() const { 3271 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3272 "Only valid on an array or array-range designator"); 3273 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3274 } 3275 3276 SourceLocation getRBracketLoc() const { 3277 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3278 "Only valid on an array or array-range designator"); 3279 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3280 } 3281 3282 SourceLocation getEllipsisLoc() const { 3283 assert(Kind == ArrayRangeDesignator && 3284 "Only valid on an array-range designator"); 3285 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3286 } 3287 3288 unsigned getFirstExprIndex() const { 3289 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3290 "Only valid on an array or array-range designator"); 3291 return ArrayOrRange.Index; 3292 } 3293 3294 SourceLocation getStartLocation() const { 3295 if (Kind == FieldDesignator) 3296 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3297 else 3298 return getLBracketLoc(); 3299 } 3300 }; 3301 3302 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3303 unsigned NumDesignators, 3304 Expr **IndexExprs, unsigned NumIndexExprs, 3305 SourceLocation EqualOrColonLoc, 3306 bool GNUSyntax, Expr *Init); 3307 3308 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3309 3310 /// @brief Returns the number of designators in this initializer. 3311 unsigned size() const { return NumDesignators; } 3312 3313 // Iterator access to the designators. 3314 typedef Designator* designators_iterator; 3315 designators_iterator designators_begin() { return Designators; } 3316 designators_iterator designators_end() { 3317 return Designators + NumDesignators; 3318 } 3319 3320 typedef std::reverse_iterator<designators_iterator> 3321 reverse_designators_iterator; 3322 reverse_designators_iterator designators_rbegin() { 3323 return reverse_designators_iterator(designators_end()); 3324 } 3325 reverse_designators_iterator designators_rend() { 3326 return reverse_designators_iterator(designators_begin()); 3327 } 3328 3329 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3330 3331 void setDesignators(ASTContext &C, const Designator *Desigs, 3332 unsigned NumDesigs); 3333 3334 Expr *getArrayIndex(const Designator& D); 3335 Expr *getArrayRangeStart(const Designator& D); 3336 Expr *getArrayRangeEnd(const Designator& D); 3337 3338 /// @brief Retrieve the location of the '=' that precedes the 3339 /// initializer value itself, if present. 3340 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3341 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3342 3343 /// @brief Determines whether this designated initializer used the 3344 /// deprecated GNU syntax for designated initializers. 3345 bool usesGNUSyntax() const { return GNUSyntax; } 3346 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3347 3348 /// @brief Retrieve the initializer value. 3349 Expr *getInit() const { 3350 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3351 } 3352 3353 void setInit(Expr *init) { 3354 *child_begin() = init; 3355 } 3356 3357 /// \brief Retrieve the total number of subexpressions in this 3358 /// designated initializer expression, including the actual 3359 /// initialized value and any expressions that occur within array 3360 /// and array-range designators. 3361 unsigned getNumSubExprs() const { return NumSubExprs; } 3362 3363 Expr *getSubExpr(unsigned Idx) { 3364 assert(Idx < NumSubExprs && "Subscript out of range"); 3365 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3366 Ptr += sizeof(DesignatedInitExpr); 3367 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3368 } 3369 3370 void setSubExpr(unsigned Idx, Expr *E) { 3371 assert(Idx < NumSubExprs && "Subscript out of range"); 3372 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3373 Ptr += sizeof(DesignatedInitExpr); 3374 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3375 } 3376 3377 /// \brief Replaces the designator at index @p Idx with the series 3378 /// of designators in [First, Last). 3379 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3380 const Designator *Last); 3381 3382 SourceRange getSourceRange() const; 3383 3384 static bool classof(const Stmt *T) { 3385 return T->getStmtClass() == DesignatedInitExprClass; 3386 } 3387 static bool classof(const DesignatedInitExpr *) { return true; } 3388 3389 // Iterators 3390 child_range children() { 3391 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3392 return child_range(begin, begin + NumSubExprs); 3393 } 3394}; 3395 3396/// \brief Represents an implicitly-generated value initialization of 3397/// an object of a given type. 3398/// 3399/// Implicit value initializations occur within semantic initializer 3400/// list expressions (InitListExpr) as placeholders for subobject 3401/// initializations not explicitly specified by the user. 3402/// 3403/// \see InitListExpr 3404class ImplicitValueInitExpr : public Expr { 3405public: 3406 explicit ImplicitValueInitExpr(QualType ty) 3407 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3408 false, false, false) { } 3409 3410 /// \brief Construct an empty implicit value initialization. 3411 explicit ImplicitValueInitExpr(EmptyShell Empty) 3412 : Expr(ImplicitValueInitExprClass, Empty) { } 3413 3414 static bool classof(const Stmt *T) { 3415 return T->getStmtClass() == ImplicitValueInitExprClass; 3416 } 3417 static bool classof(const ImplicitValueInitExpr *) { return true; } 3418 3419 SourceRange getSourceRange() const { 3420 return SourceRange(); 3421 } 3422 3423 // Iterators 3424 child_range children() { return child_range(); } 3425}; 3426 3427 3428class ParenListExpr : public Expr { 3429 Stmt **Exprs; 3430 unsigned NumExprs; 3431 SourceLocation LParenLoc, RParenLoc; 3432 3433public: 3434 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3435 unsigned numexprs, SourceLocation rparenloc); 3436 3437 /// \brief Build an empty paren list. 3438 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3439 3440 unsigned getNumExprs() const { return NumExprs; } 3441 3442 const Expr* getExpr(unsigned Init) const { 3443 assert(Init < getNumExprs() && "Initializer access out of range!"); 3444 return cast_or_null<Expr>(Exprs[Init]); 3445 } 3446 3447 Expr* getExpr(unsigned Init) { 3448 assert(Init < getNumExprs() && "Initializer access out of range!"); 3449 return cast_or_null<Expr>(Exprs[Init]); 3450 } 3451 3452 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3453 3454 SourceLocation getLParenLoc() const { return LParenLoc; } 3455 SourceLocation getRParenLoc() const { return RParenLoc; } 3456 3457 SourceRange getSourceRange() const { 3458 return SourceRange(LParenLoc, RParenLoc); 3459 } 3460 static bool classof(const Stmt *T) { 3461 return T->getStmtClass() == ParenListExprClass; 3462 } 3463 static bool classof(const ParenListExpr *) { return true; } 3464 3465 // Iterators 3466 child_range children() { 3467 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3468 } 3469 3470 friend class ASTStmtReader; 3471 friend class ASTStmtWriter; 3472}; 3473 3474 3475//===----------------------------------------------------------------------===// 3476// Clang Extensions 3477//===----------------------------------------------------------------------===// 3478 3479 3480/// ExtVectorElementExpr - This represents access to specific elements of a 3481/// vector, and may occur on the left hand side or right hand side. For example 3482/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3483/// 3484/// Note that the base may have either vector or pointer to vector type, just 3485/// like a struct field reference. 3486/// 3487class ExtVectorElementExpr : public Expr { 3488 Stmt *Base; 3489 IdentifierInfo *Accessor; 3490 SourceLocation AccessorLoc; 3491public: 3492 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3493 IdentifierInfo &accessor, SourceLocation loc) 3494 : Expr(ExtVectorElementExprClass, ty, VK, 3495 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3496 base->isTypeDependent(), base->isValueDependent(), 3497 base->containsUnexpandedParameterPack()), 3498 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3499 3500 /// \brief Build an empty vector element expression. 3501 explicit ExtVectorElementExpr(EmptyShell Empty) 3502 : Expr(ExtVectorElementExprClass, Empty) { } 3503 3504 const Expr *getBase() const { return cast<Expr>(Base); } 3505 Expr *getBase() { return cast<Expr>(Base); } 3506 void setBase(Expr *E) { Base = E; } 3507 3508 IdentifierInfo &getAccessor() const { return *Accessor; } 3509 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3510 3511 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3512 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3513 3514 /// getNumElements - Get the number of components being selected. 3515 unsigned getNumElements() const; 3516 3517 /// containsDuplicateElements - Return true if any element access is 3518 /// repeated. 3519 bool containsDuplicateElements() const; 3520 3521 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3522 /// aggregate Constant of ConstantInt(s). 3523 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3524 3525 SourceRange getSourceRange() const { 3526 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3527 } 3528 3529 /// isArrow - Return true if the base expression is a pointer to vector, 3530 /// return false if the base expression is a vector. 3531 bool isArrow() const; 3532 3533 static bool classof(const Stmt *T) { 3534 return T->getStmtClass() == ExtVectorElementExprClass; 3535 } 3536 static bool classof(const ExtVectorElementExpr *) { return true; } 3537 3538 // Iterators 3539 child_range children() { return child_range(&Base, &Base+1); } 3540}; 3541 3542 3543/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3544/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3545class BlockExpr : public Expr { 3546protected: 3547 BlockDecl *TheBlock; 3548public: 3549 BlockExpr(BlockDecl *BD, QualType ty) 3550 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3551 ty->isDependentType(), false, false), 3552 TheBlock(BD) {} 3553 3554 /// \brief Build an empty block expression. 3555 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3556 3557 const BlockDecl *getBlockDecl() const { return TheBlock; } 3558 BlockDecl *getBlockDecl() { return TheBlock; } 3559 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3560 3561 // Convenience functions for probing the underlying BlockDecl. 3562 SourceLocation getCaretLocation() const; 3563 const Stmt *getBody() const; 3564 Stmt *getBody(); 3565 3566 SourceRange getSourceRange() const { 3567 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3568 } 3569 3570 /// getFunctionType - Return the underlying function type for this block. 3571 const FunctionType *getFunctionType() const; 3572 3573 static bool classof(const Stmt *T) { 3574 return T->getStmtClass() == BlockExprClass; 3575 } 3576 static bool classof(const BlockExpr *) { return true; } 3577 3578 // Iterators 3579 child_range children() { return child_range(); } 3580}; 3581 3582/// BlockDeclRefExpr - A reference to a local variable declared in an 3583/// enclosing scope. 3584class BlockDeclRefExpr : public Expr { 3585 VarDecl *D; 3586 SourceLocation Loc; 3587 bool IsByRef : 1; 3588 bool ConstQualAdded : 1; 3589public: 3590 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3591 SourceLocation l, bool ByRef, bool constAdded = false); 3592 3593 // \brief Build an empty reference to a declared variable in a 3594 // block. 3595 explicit BlockDeclRefExpr(EmptyShell Empty) 3596 : Expr(BlockDeclRefExprClass, Empty) { } 3597 3598 VarDecl *getDecl() { return D; } 3599 const VarDecl *getDecl() const { return D; } 3600 void setDecl(VarDecl *VD) { D = VD; } 3601 3602 SourceLocation getLocation() const { return Loc; } 3603 void setLocation(SourceLocation L) { Loc = L; } 3604 3605 SourceRange getSourceRange() const { return SourceRange(Loc); } 3606 3607 bool isByRef() const { return IsByRef; } 3608 void setByRef(bool BR) { IsByRef = BR; } 3609 3610 bool isConstQualAdded() const { return ConstQualAdded; } 3611 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3612 3613 static bool classof(const Stmt *T) { 3614 return T->getStmtClass() == BlockDeclRefExprClass; 3615 } 3616 static bool classof(const BlockDeclRefExpr *) { return true; } 3617 3618 // Iterators 3619 child_range children() { return child_range(); } 3620}; 3621 3622/// OpaqueValueExpr - An expression referring to an opaque object of a 3623/// fixed type and value class. These don't correspond to concrete 3624/// syntax; instead they're used to express operations (usually copy 3625/// operations) on values whose source is generally obvious from 3626/// context. 3627class OpaqueValueExpr : public Expr { 3628 friend class ASTStmtReader; 3629 SourceLocation Loc; 3630 3631public: 3632 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 3633 ExprObjectKind OK = OK_Ordinary) 3634 : Expr(OpaqueValueExprClass, T, VK, OK, 3635 T->isDependentType(), T->isDependentType(), false), 3636 Loc(Loc) { 3637 } 3638 3639 explicit OpaqueValueExpr(EmptyShell Empty) 3640 : Expr(OpaqueValueExprClass, Empty) { } 3641 3642 /// \brief Retrieve the location of this expression. 3643 SourceLocation getLocation() const { return Loc; } 3644 3645 SourceRange getSourceRange() const { return Loc; } 3646 child_range children() { return child_range(); } 3647 3648 static bool classof(const Stmt *T) { 3649 return T->getStmtClass() == OpaqueValueExprClass; 3650 } 3651 static bool classof(const OpaqueValueExpr *) { return true; } 3652}; 3653 3654} // end namespace clang 3655 3656#endif 3657