Expr.h revision 75e85048e73fcde2ce9d8a48dfdb1220e132eb59
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 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ContainsUnexpandedParameterPack) : Stmt(SC) { 61 ExprBits.TypeDependent = TD; 62 ExprBits.ValueDependent = VD; 63 ExprBits.ValueKind = VK; 64 ExprBits.ObjectKind = OK; 65 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 66 setType(T); 67 } 68 69 /// \brief Construct an empty expression. 70 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 71 72public: 73 QualType getType() const { return TR; } 74 void setType(QualType t) { 75 // In C++, the type of an expression is always adjusted so that it 76 // will not have reference type an expression will never have 77 // reference type (C++ [expr]p6). Use 78 // QualType::getNonReferenceType() to retrieve the non-reference 79 // type. Additionally, inspect Expr::isLvalue to determine whether 80 // an expression that is adjusted in this manner should be 81 // considered an lvalue. 82 assert((t.isNull() || !t->isReferenceType()) && 83 "Expressions can't have reference type"); 84 85 TR = t; 86 } 87 88 /// isValueDependent - Determines whether this expression is 89 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 90 /// array bound of "Chars" in the following example is 91 /// value-dependent. 92 /// @code 93 /// template<int Size, char (&Chars)[Size]> struct meta_string; 94 /// @endcode 95 bool isValueDependent() const { return ExprBits.ValueDependent; } 96 97 /// \brief Set whether this expression is value-dependent or not. 98 void setValueDependent(bool VD) { ExprBits.ValueDependent = VD; } 99 100 /// isTypeDependent - Determines whether this expression is 101 /// type-dependent (C++ [temp.dep.expr]), which means that its type 102 /// could change from one template instantiation to the next. For 103 /// example, the expressions "x" and "x + y" are type-dependent in 104 /// the following code, but "y" is not type-dependent: 105 /// @code 106 /// template<typename T> 107 /// void add(T x, int y) { 108 /// x + y; 109 /// } 110 /// @endcode 111 bool isTypeDependent() const { return ExprBits.TypeDependent; } 112 113 /// \brief Set whether this expression is type-dependent or not. 114 void setTypeDependent(bool TD) { ExprBits.TypeDependent = TD; } 115 116 /// \brief Whether this expression contains an unexpanded parameter 117 /// pack (for C++0x variadic templates). 118 /// 119 /// Given the following function template: 120 /// 121 /// \code 122 /// template<typename F, typename ...Types> 123 /// void forward(const F &f, Types &&...args) { 124 /// f(static_cast<Types&&>(args)...); 125 /// } 126 /// \endcode 127 /// 128 /// The expressions \c args and \c static_cast<Types&&>(args) both 129 /// contain parameter packs. 130 bool containsUnexpandedParameterPack() const { 131 return ExprBits.ContainsUnexpandedParameterPack; 132 } 133 134 /// \brief Set the bit that describes whether this expression 135 /// contains an unexpanded parameter pack. 136 void setContainsUnexpandedParameterPack(bool PP = true) { 137 ExprBits.ContainsUnexpandedParameterPack = PP; 138 } 139 140 /// getExprLoc - Return the preferred location for the arrow when diagnosing 141 /// a problem with a generic expression. 142 SourceLocation getExprLoc() const; 143 144 /// isUnusedResultAWarning - Return true if this immediate expression should 145 /// be warned about if the result is unused. If so, fill in Loc and Ranges 146 /// with location to warn on and the source range[s] to report with the 147 /// warning. 148 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 149 SourceRange &R2, ASTContext &Ctx) const; 150 151 /// isLValue - True if this expression is an "l-value" according to 152 /// the rules of the current language. C and C++ give somewhat 153 /// different rules for this concept, but in general, the result of 154 /// an l-value expression identifies a specific object whereas the 155 /// result of an r-value expression is a value detached from any 156 /// specific storage. 157 /// 158 /// C++0x divides the concept of "r-value" into pure r-values 159 /// ("pr-values") and so-called expiring values ("x-values"), which 160 /// identify specific objects that can be safely cannibalized for 161 /// their resources. This is an unfortunate abuse of terminology on 162 /// the part of the C++ committee. In Clang, when we say "r-value", 163 /// we generally mean a pr-value. 164 bool isLValue() const { return getValueKind() == VK_LValue; } 165 bool isRValue() const { return getValueKind() == VK_RValue; } 166 bool isXValue() const { return getValueKind() == VK_XValue; } 167 bool isGLValue() const { return getValueKind() != VK_RValue; } 168 169 enum LValueClassification { 170 LV_Valid, 171 LV_NotObjectType, 172 LV_IncompleteVoidType, 173 LV_DuplicateVectorComponents, 174 LV_InvalidExpression, 175 LV_MemberFunction, 176 LV_SubObjCPropertySetting, 177 LV_ClassTemporary 178 }; 179 /// Reasons why an expression might not be an l-value. 180 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 181 182 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 183 /// does not have an incomplete type, does not have a const-qualified type, 184 /// and if it is a structure or union, does not have any member (including, 185 /// recursively, any member or element of all contained aggregates or unions) 186 /// with a const-qualified type. 187 /// 188 /// \param Loc [in] [out] - A source location which *may* be filled 189 /// in with the location of the expression making this a 190 /// non-modifiable lvalue, if specified. 191 enum isModifiableLvalueResult { 192 MLV_Valid, 193 MLV_NotObjectType, 194 MLV_IncompleteVoidType, 195 MLV_DuplicateVectorComponents, 196 MLV_InvalidExpression, 197 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 198 MLV_IncompleteType, 199 MLV_ConstQualified, 200 MLV_ArrayType, 201 MLV_NotBlockQualified, 202 MLV_ReadonlyProperty, 203 MLV_NoSetterProperty, 204 MLV_MemberFunction, 205 MLV_SubObjCPropertySetting, 206 MLV_ClassTemporary 207 }; 208 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 209 SourceLocation *Loc = 0) const; 210 211 /// \brief The return type of classify(). Represents the C++0x expression 212 /// taxonomy. 213 class Classification { 214 public: 215 /// \brief The various classification results. Most of these mean prvalue. 216 enum Kinds { 217 CL_LValue, 218 CL_XValue, 219 CL_Function, // Functions cannot be lvalues in C. 220 CL_Void, // Void cannot be an lvalue in C. 221 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 222 CL_MemberFunction, // An expression referring to a member function 223 CL_SubObjCPropertySetting, 224 CL_ClassTemporary, // A prvalue of class type 225 CL_PRValue // A prvalue for any other reason, of any other type 226 }; 227 /// \brief The results of modification testing. 228 enum ModifiableType { 229 CM_Untested, // testModifiable was false. 230 CM_Modifiable, 231 CM_RValue, // Not modifiable because it's an rvalue 232 CM_Function, // Not modifiable because it's a function; C++ only 233 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 234 CM_NotBlockQualified, // Not captured in the closure 235 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 236 CM_ConstQualified, 237 CM_ArrayType, 238 CM_IncompleteType 239 }; 240 241 private: 242 friend class Expr; 243 244 unsigned short Kind; 245 unsigned short Modifiable; 246 247 explicit Classification(Kinds k, ModifiableType m) 248 : Kind(k), Modifiable(m) 249 {} 250 251 public: 252 Classification() {} 253 254 Kinds getKind() const { return static_cast<Kinds>(Kind); } 255 ModifiableType getModifiable() const { 256 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 257 return static_cast<ModifiableType>(Modifiable); 258 } 259 bool isLValue() const { return Kind == CL_LValue; } 260 bool isXValue() const { return Kind == CL_XValue; } 261 bool isGLValue() const { return Kind <= CL_XValue; } 262 bool isPRValue() const { return Kind >= CL_Function; } 263 bool isRValue() const { return Kind >= CL_XValue; } 264 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 265 266 /// \brief Create a simple, modifiably lvalue 267 static Classification makeSimpleLValue() { 268 return Classification(CL_LValue, CM_Modifiable); 269 } 270 271 }; 272 /// \brief Classify - Classify this expression according to the C++0x 273 /// expression taxonomy. 274 /// 275 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 276 /// old lvalue vs rvalue. This function determines the type of expression this 277 /// is. There are three expression types: 278 /// - lvalues are classical lvalues as in C++03. 279 /// - prvalues are equivalent to rvalues in C++03. 280 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 281 /// function returning an rvalue reference. 282 /// lvalues and xvalues are collectively referred to as glvalues, while 283 /// prvalues and xvalues together form rvalues. 284 Classification Classify(ASTContext &Ctx) const { 285 return ClassifyImpl(Ctx, 0); 286 } 287 288 /// \brief ClassifyModifiable - Classify this expression according to the 289 /// C++0x expression taxonomy, and see if it is valid on the left side 290 /// of an assignment. 291 /// 292 /// This function extends classify in that it also tests whether the 293 /// expression is modifiable (C99 6.3.2.1p1). 294 /// \param Loc A source location that might be filled with a relevant location 295 /// if the expression is not modifiable. 296 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 297 return ClassifyImpl(Ctx, &Loc); 298 } 299 300 /// getValueKindForType - Given a formal return or parameter type, 301 /// give its value kind. 302 static ExprValueKind getValueKindForType(QualType T) { 303 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 304 return (isa<LValueReferenceType>(RT) 305 ? VK_LValue 306 : (RT->getPointeeType()->isFunctionType() 307 ? VK_LValue : VK_XValue)); 308 return VK_RValue; 309 } 310 311 /// getValueKind - The value kind that this expression produces. 312 ExprValueKind getValueKind() const { 313 return static_cast<ExprValueKind>(ExprBits.ValueKind); 314 } 315 316 /// getObjectKind - The object kind that this expression produces. 317 /// Object kinds are meaningful only for expressions that yield an 318 /// l-value or x-value. 319 ExprObjectKind getObjectKind() const { 320 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 321 } 322 323 bool isOrdinaryOrBitFieldObject() const { 324 ExprObjectKind OK = getObjectKind(); 325 return (OK == OK_Ordinary || OK == OK_BitField); 326 } 327 328 /// setValueKind - Set the value kind produced by this expression. 329 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 330 331 /// setObjectKind - Set the object kind produced by this expression. 332 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 333 334private: 335 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 336 337public: 338 339 /// \brief If this expression refers to a bit-field, retrieve the 340 /// declaration of that bit-field. 341 FieldDecl *getBitField(); 342 343 const FieldDecl *getBitField() const { 344 return const_cast<Expr*>(this)->getBitField(); 345 } 346 347 /// \brief If this expression is an l-value for an Objective C 348 /// property, find the underlying property reference expression. 349 const ObjCPropertyRefExpr *getObjCProperty() const; 350 351 /// \brief Returns whether this expression refers to a vector element. 352 bool refersToVectorElement() const; 353 354 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 355 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 356 /// but also int expressions which are produced by things like comparisons in 357 /// C. 358 bool isKnownToHaveBooleanValue() const; 359 360 /// isIntegerConstantExpr - Return true if this expression is a valid integer 361 /// constant expression, and, if so, return its value in Result. If not a 362 /// valid i-c-e, return false and fill in Loc (if specified) with the location 363 /// of the invalid expression. 364 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 365 SourceLocation *Loc = 0, 366 bool isEvaluated = true) const; 367 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 368 llvm::APSInt X; 369 return isIntegerConstantExpr(X, Ctx, Loc); 370 } 371 /// isConstantInitializer - Returns true if this expression is a constant 372 /// initializer, which can be emitted at compile-time. 373 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 374 375 /// EvalResult is a struct with detailed info about an evaluated expression. 376 struct EvalResult { 377 /// Val - This is the value the expression can be folded to. 378 APValue Val; 379 380 /// HasSideEffects - Whether the evaluated expression has side effects. 381 /// For example, (f() && 0) can be folded, but it still has side effects. 382 bool HasSideEffects; 383 384 /// Diag - If the expression is unfoldable, then Diag contains a note 385 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 386 /// position for the error, and DiagExpr is the expression that caused 387 /// the error. 388 /// If the expression is foldable, but not an integer constant expression, 389 /// Diag contains a note diagnostic that describes why it isn't an integer 390 /// constant expression. If the expression *is* an integer constant 391 /// expression, then Diag will be zero. 392 unsigned Diag; 393 const Expr *DiagExpr; 394 SourceLocation DiagLoc; 395 396 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 397 398 // isGlobalLValue - Return true if the evaluated lvalue expression 399 // is global. 400 bool isGlobalLValue() const; 401 // hasSideEffects - Return true if the evaluated expression has 402 // side effects. 403 bool hasSideEffects() const { 404 return HasSideEffects; 405 } 406 }; 407 408 /// Evaluate - Return true if this is a constant which we can fold using 409 /// any crazy technique (that has nothing to do with language standards) that 410 /// we want to. If this function returns true, it returns the folded constant 411 /// in Result. 412 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 413 414 /// EvaluateAsBooleanCondition - Return true if this is a constant 415 /// which we we can fold and convert to a boolean condition using 416 /// any crazy technique that we want to. 417 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 418 419 /// isEvaluatable - Call Evaluate to see if this expression can be constant 420 /// folded, but discard the result. 421 bool isEvaluatable(const ASTContext &Ctx) const; 422 423 /// HasSideEffects - This routine returns true for all those expressions 424 /// which must be evaluated each time and must not be optimized away 425 /// or evaluated at compile time. Example is a function call, volatile 426 /// variable read. 427 bool HasSideEffects(const ASTContext &Ctx) const; 428 429 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 430 /// must be called on an expression that constant folds to an integer. 431 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 432 433 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 434 /// with link time known address. 435 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 436 437 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 438 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 439 440 /// \brief Enumeration used to describe the kind of Null pointer constant 441 /// returned from \c isNullPointerConstant(). 442 enum NullPointerConstantKind { 443 /// \brief Expression is not a Null pointer constant. 444 NPCK_NotNull = 0, 445 446 /// \brief Expression is a Null pointer constant built from a zero integer. 447 NPCK_ZeroInteger, 448 449 /// \brief Expression is a C++0X nullptr. 450 NPCK_CXX0X_nullptr, 451 452 /// \brief Expression is a GNU-style __null constant. 453 NPCK_GNUNull 454 }; 455 456 /// \brief Enumeration used to describe how \c isNullPointerConstant() 457 /// should cope with value-dependent expressions. 458 enum NullPointerConstantValueDependence { 459 /// \brief Specifies that the expression should never be value-dependent. 460 NPC_NeverValueDependent = 0, 461 462 /// \brief Specifies that a value-dependent expression of integral or 463 /// dependent type should be considered a null pointer constant. 464 NPC_ValueDependentIsNull, 465 466 /// \brief Specifies that a value-dependent expression should be considered 467 /// to never be a null pointer constant. 468 NPC_ValueDependentIsNotNull 469 }; 470 471 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 472 /// a Null pointer constant. The return value can further distinguish the 473 /// kind of NULL pointer constant that was detected. 474 NullPointerConstantKind isNullPointerConstant( 475 ASTContext &Ctx, 476 NullPointerConstantValueDependence NPC) const; 477 478 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 479 /// write barrier. 480 bool isOBJCGCCandidate(ASTContext &Ctx) const; 481 482 /// \brief Returns true if this expression is a bound member function. 483 bool isBoundMemberFunction(ASTContext &Ctx) const; 484 485 /// \brief Result type of CanThrow(). 486 enum CanThrowResult { 487 CT_Cannot, 488 CT_Dependent, 489 CT_Can 490 }; 491 /// \brief Test if this expression, if evaluated, might throw, according to 492 /// the rules of C++ [expr.unary.noexcept]. 493 CanThrowResult CanThrow(ASTContext &C) const; 494 495 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 496 /// its subexpression. If that subexpression is also a ParenExpr, 497 /// then this method recursively returns its subexpression, and so forth. 498 /// Otherwise, the method returns the current Expr. 499 Expr *IgnoreParens(); 500 501 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 502 /// or CastExprs, returning their operand. 503 Expr *IgnoreParenCasts(); 504 505 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 506 /// ParenExpr or ImplicitCastExprs, returning their operand. 507 Expr *IgnoreParenImpCasts(); 508 509 const Expr *IgnoreParenImpCasts() const { 510 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 511 } 512 513 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 514 /// CastExprs that represent lvalue casts, returning their operand. 515 Expr *IgnoreParenLValueCasts(); 516 517 const Expr *IgnoreParenLValueCasts() const { 518 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 519 } 520 521 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 522 /// value (including ptr->int casts of the same size). Strip off any 523 /// ParenExpr or CastExprs, returning their operand. 524 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 525 526 /// \brief Determine whether this expression is a default function argument. 527 /// 528 /// Default arguments are implicitly generated in the abstract syntax tree 529 /// by semantic analysis for function calls, object constructions, etc. in 530 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 531 /// this routine also looks through any implicit casts to determine whether 532 /// the expression is a default argument. 533 bool isDefaultArgument() const; 534 535 /// \brief Determine whether the result of this expression is a 536 /// temporary object of the given class type. 537 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 538 539 /// \brief Whether this expression is an implicit reference to 'this' in C++. 540 bool isImplicitCXXThis() const; 541 542 const Expr *IgnoreParens() const { 543 return const_cast<Expr*>(this)->IgnoreParens(); 544 } 545 const Expr *IgnoreParenCasts() const { 546 return const_cast<Expr*>(this)->IgnoreParenCasts(); 547 } 548 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 549 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 550 } 551 552 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 553 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 554 555 static bool classof(const Stmt *T) { 556 return T->getStmtClass() >= firstExprConstant && 557 T->getStmtClass() <= lastExprConstant; 558 } 559 static bool classof(const Expr *) { return true; } 560}; 561 562 563//===----------------------------------------------------------------------===// 564// Primary Expressions. 565//===----------------------------------------------------------------------===// 566 567/// OpaqueValueExpr - An expression referring to an opaque object of a 568/// fixed type and value class. These don't correspond to concrete 569/// syntax; instead they're used to express operations (usually copy 570/// operations) on values whose source is generally obvious from 571/// context. 572class OpaqueValueExpr : public Expr { 573 friend class ASTStmtReader; 574 Expr *SourceExpr; 575 SourceLocation Loc; 576 577public: 578 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 579 ExprObjectKind OK = OK_Ordinary) 580 : Expr(OpaqueValueExprClass, T, VK, OK, 581 T->isDependentType(), T->isDependentType(), false), 582 SourceExpr(0), Loc(Loc) { 583 } 584 585 /// Given an expression which invokes a copy constructor --- i.e. a 586 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 587 /// find the OpaqueValueExpr that's the source of the construction. 588 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 589 590 explicit OpaqueValueExpr(EmptyShell Empty) 591 : Expr(OpaqueValueExprClass, Empty) { } 592 593 /// \brief Retrieve the location of this expression. 594 SourceLocation getLocation() const { return Loc; } 595 596 SourceRange getSourceRange() const { 597 if (SourceExpr) return SourceExpr->getSourceRange(); 598 return Loc; 599 } 600 SourceLocation getExprLoc() const { 601 if (SourceExpr) return SourceExpr->getExprLoc(); 602 return Loc; 603 } 604 605 child_range children() { return child_range(); } 606 607 /// The source expression of an opaque value expression is the 608 /// expression which originally generated the value. This is 609 /// provided as a convenience for analyses that don't wish to 610 /// precisely model the execution behavior of the program. 611 /// 612 /// The source expression is typically set when building the 613 /// expression which binds the opaque value expression in the first 614 /// place. 615 Expr *getSourceExpr() const { return SourceExpr; } 616 void setSourceExpr(Expr *e) { SourceExpr = e; } 617 618 static bool classof(const Stmt *T) { 619 return T->getStmtClass() == OpaqueValueExprClass; 620 } 621 static bool classof(const OpaqueValueExpr *) { return true; } 622}; 623 624/// \brief Represents the qualifier that may precede a C++ name, e.g., the 625/// "std::" in "std::sort". 626struct NameQualifier { 627 /// \brief The nested-name-specifier that qualifies the name, including 628 /// source-location information. 629 NestedNameSpecifierLoc QualifierLoc; 630}; 631 632/// \brief Represents an explicit template argument list in C++, e.g., 633/// the "<int>" in "sort<int>". 634struct ExplicitTemplateArgumentList { 635 /// \brief The source location of the left angle bracket ('<'); 636 SourceLocation LAngleLoc; 637 638 /// \brief The source location of the right angle bracket ('>'); 639 SourceLocation RAngleLoc; 640 641 /// \brief The number of template arguments in TemplateArgs. 642 /// The actual template arguments (if any) are stored after the 643 /// ExplicitTemplateArgumentList structure. 644 unsigned NumTemplateArgs; 645 646 /// \brief Retrieve the template arguments 647 TemplateArgumentLoc *getTemplateArgs() { 648 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 649 } 650 651 /// \brief Retrieve the template arguments 652 const TemplateArgumentLoc *getTemplateArgs() const { 653 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 654 } 655 656 void initializeFrom(const TemplateArgumentListInfo &List); 657 void initializeFrom(const TemplateArgumentListInfo &List, 658 bool &Dependent, bool &ContainsUnexpandedParameterPack); 659 void copyInto(TemplateArgumentListInfo &List) const; 660 static std::size_t sizeFor(unsigned NumTemplateArgs); 661 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 662}; 663 664/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 665/// enum, etc. 666class DeclRefExpr : public Expr { 667 enum { 668 // Flag on DecoratedD that specifies when this declaration reference 669 // expression has a C++ nested-name-specifier. 670 HasQualifierFlag = 0x01, 671 // Flag on DecoratedD that specifies when this declaration reference 672 // expression has an explicit C++ template argument list. 673 HasExplicitTemplateArgumentListFlag = 0x02 674 }; 675 676 // DecoratedD - The declaration that we are referencing, plus two bits to 677 // indicate whether (1) the declaration's name was explicitly qualified and 678 // (2) the declaration's name was followed by an explicit template 679 // argument list. 680 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 681 682 // Loc - The location of the declaration name itself. 683 SourceLocation Loc; 684 685 /// DNLoc - Provides source/type location info for the 686 /// declaration name embedded in DecoratedD. 687 DeclarationNameLoc DNLoc; 688 689 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 690 NameQualifier *getNameQualifier() { 691 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 692 return 0; 693 694 return reinterpret_cast<NameQualifier *> (this + 1); 695 } 696 697 /// \brief Retrieve the qualifier that preceded the member name, if any. 698 const NameQualifier *getNameQualifier() const { 699 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 700 } 701 702 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 703 ValueDecl *D, SourceLocation NameLoc, 704 const TemplateArgumentListInfo *TemplateArgs, 705 QualType T, ExprValueKind VK); 706 707 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 708 ValueDecl *D, const DeclarationNameInfo &NameInfo, 709 const TemplateArgumentListInfo *TemplateArgs, 710 QualType T, ExprValueKind VK); 711 712 /// \brief Construct an empty declaration reference expression. 713 explicit DeclRefExpr(EmptyShell Empty) 714 : Expr(DeclRefExprClass, Empty) { } 715 716 /// \brief Computes the type- and value-dependence flags for this 717 /// declaration reference expression. 718 void computeDependence(); 719 720public: 721 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 722 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 723 DecoratedD(d, 0), Loc(l) { 724 computeDependence(); 725 } 726 727 static DeclRefExpr *Create(ASTContext &Context, 728 NestedNameSpecifierLoc QualifierLoc, 729 ValueDecl *D, 730 SourceLocation NameLoc, 731 QualType T, ExprValueKind VK, 732 const TemplateArgumentListInfo *TemplateArgs = 0); 733 734 static DeclRefExpr *Create(ASTContext &Context, 735 NestedNameSpecifierLoc QualifierLoc, 736 ValueDecl *D, 737 const DeclarationNameInfo &NameInfo, 738 QualType T, ExprValueKind VK, 739 const TemplateArgumentListInfo *TemplateArgs = 0); 740 741 /// \brief Construct an empty declaration reference expression. 742 static DeclRefExpr *CreateEmpty(ASTContext &Context, 743 bool HasQualifier, 744 bool HasExplicitTemplateArgs, 745 unsigned NumTemplateArgs); 746 747 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 748 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 749 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 750 751 DeclarationNameInfo getNameInfo() const { 752 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 753 } 754 755 SourceLocation getLocation() const { return Loc; } 756 void setLocation(SourceLocation L) { Loc = L; } 757 SourceRange getSourceRange() const; 758 759 /// \brief Determine whether this declaration reference was preceded by a 760 /// C++ nested-name-specifier, e.g., \c N::foo. 761 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 762 763 /// \brief If the name was qualified, retrieves the nested-name-specifier 764 /// that precedes the name. Otherwise, returns NULL. 765 NestedNameSpecifier *getQualifier() const { 766 if (!hasQualifier()) 767 return 0; 768 769 return getNameQualifier()->QualifierLoc.getNestedNameSpecifier(); 770 } 771 772 /// \brief If the name was qualified, retrieves the nested-name-specifier 773 /// that precedes the name, with source-location information. 774 NestedNameSpecifierLoc getQualifierLoc() const { 775 if (!hasQualifier()) 776 return NestedNameSpecifierLoc(); 777 778 return getNameQualifier()->QualifierLoc; 779 } 780 781 bool hasExplicitTemplateArgs() const { 782 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 783 } 784 785 /// \brief Retrieve the explicit template argument list that followed the 786 /// member template name. 787 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 788 assert(hasExplicitTemplateArgs()); 789 790 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 791 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 792 793 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 794 getNameQualifier() + 1); 795 } 796 797 /// \brief Retrieve the explicit template argument list that followed the 798 /// member template name. 799 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 800 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 801 } 802 803 /// \brief Retrieves the optional explicit template arguments. 804 /// This points to the same data as getExplicitTemplateArgs(), but 805 /// returns null if there are no explicit template arguments. 806 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 807 if (!hasExplicitTemplateArgs()) return 0; 808 return &getExplicitTemplateArgs(); 809 } 810 811 /// \brief Copies the template arguments (if present) into the given 812 /// structure. 813 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 814 if (hasExplicitTemplateArgs()) 815 getExplicitTemplateArgs().copyInto(List); 816 } 817 818 /// \brief Retrieve the location of the left angle bracket following the 819 /// member name ('<'), if any. 820 SourceLocation getLAngleLoc() const { 821 if (!hasExplicitTemplateArgs()) 822 return SourceLocation(); 823 824 return getExplicitTemplateArgs().LAngleLoc; 825 } 826 827 /// \brief Retrieve the template arguments provided as part of this 828 /// template-id. 829 const TemplateArgumentLoc *getTemplateArgs() const { 830 if (!hasExplicitTemplateArgs()) 831 return 0; 832 833 return getExplicitTemplateArgs().getTemplateArgs(); 834 } 835 836 /// \brief Retrieve the number of template arguments provided as part of this 837 /// template-id. 838 unsigned getNumTemplateArgs() const { 839 if (!hasExplicitTemplateArgs()) 840 return 0; 841 842 return getExplicitTemplateArgs().NumTemplateArgs; 843 } 844 845 /// \brief Retrieve the location of the right angle bracket following the 846 /// template arguments ('>'). 847 SourceLocation getRAngleLoc() const { 848 if (!hasExplicitTemplateArgs()) 849 return SourceLocation(); 850 851 return getExplicitTemplateArgs().RAngleLoc; 852 } 853 854 static bool classof(const Stmt *T) { 855 return T->getStmtClass() == DeclRefExprClass; 856 } 857 static bool classof(const DeclRefExpr *) { return true; } 858 859 // Iterators 860 child_range children() { return child_range(); } 861 862 friend class ASTStmtReader; 863 friend class ASTStmtWriter; 864}; 865 866/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 867class PredefinedExpr : public Expr { 868public: 869 enum IdentType { 870 Func, 871 Function, 872 PrettyFunction, 873 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 874 /// 'virtual' keyword is omitted for virtual member functions. 875 PrettyFunctionNoVirtual 876 }; 877 878private: 879 SourceLocation Loc; 880 IdentType Type; 881public: 882 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 883 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 884 type->isDependentType(), type->isDependentType(), 885 /*ContainsUnexpandedParameterPack=*/false), 886 Loc(l), Type(IT) {} 887 888 /// \brief Construct an empty predefined expression. 889 explicit PredefinedExpr(EmptyShell Empty) 890 : Expr(PredefinedExprClass, Empty) { } 891 892 IdentType getIdentType() const { return Type; } 893 void setIdentType(IdentType IT) { Type = IT; } 894 895 SourceLocation getLocation() const { return Loc; } 896 void setLocation(SourceLocation L) { Loc = L; } 897 898 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 899 900 SourceRange getSourceRange() const { return SourceRange(Loc); } 901 902 static bool classof(const Stmt *T) { 903 return T->getStmtClass() == PredefinedExprClass; 904 } 905 static bool classof(const PredefinedExpr *) { return true; } 906 907 // Iterators 908 child_range children() { return child_range(); } 909}; 910 911/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 912/// leaking memory. 913/// 914/// For large floats/integers, APFloat/APInt will allocate memory from the heap 915/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 916/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 917/// the APFloat/APInt values will never get freed. APNumericStorage uses 918/// ASTContext's allocator for memory allocation. 919class APNumericStorage { 920 unsigned BitWidth; 921 union { 922 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 923 uint64_t *pVal; ///< Used to store the >64 bits integer value. 924 }; 925 926 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 927 928 APNumericStorage(const APNumericStorage&); // do not implement 929 APNumericStorage& operator=(const APNumericStorage&); // do not implement 930 931protected: 932 APNumericStorage() : BitWidth(0), VAL(0) { } 933 934 llvm::APInt getIntValue() const { 935 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 936 if (NumWords > 1) 937 return llvm::APInt(BitWidth, NumWords, pVal); 938 else 939 return llvm::APInt(BitWidth, VAL); 940 } 941 void setIntValue(ASTContext &C, const llvm::APInt &Val); 942}; 943 944class APIntStorage : public APNumericStorage { 945public: 946 llvm::APInt getValue() const { return getIntValue(); } 947 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 948}; 949 950class APFloatStorage : public APNumericStorage { 951public: 952 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 953 void setValue(ASTContext &C, const llvm::APFloat &Val) { 954 setIntValue(C, Val.bitcastToAPInt()); 955 } 956}; 957 958class IntegerLiteral : public Expr { 959 APIntStorage Num; 960 SourceLocation Loc; 961 962 /// \brief Construct an empty integer literal. 963 explicit IntegerLiteral(EmptyShell Empty) 964 : Expr(IntegerLiteralClass, Empty) { } 965 966public: 967 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 968 // or UnsignedLongLongTy 969 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 970 QualType type, SourceLocation l) 971 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 972 false), 973 Loc(l) { 974 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 975 setValue(C, V); 976 } 977 978 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 979 // or UnsignedLongLongTy 980 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 981 QualType type, SourceLocation l); 982 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 983 984 llvm::APInt getValue() const { return Num.getValue(); } 985 SourceRange getSourceRange() const { return SourceRange(Loc); } 986 987 /// \brief Retrieve the location of the literal. 988 SourceLocation getLocation() const { return Loc; } 989 990 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 991 void setLocation(SourceLocation Location) { Loc = Location; } 992 993 static bool classof(const Stmt *T) { 994 return T->getStmtClass() == IntegerLiteralClass; 995 } 996 static bool classof(const IntegerLiteral *) { return true; } 997 998 // Iterators 999 child_range children() { return child_range(); } 1000}; 1001 1002class CharacterLiteral : public Expr { 1003 unsigned Value; 1004 SourceLocation Loc; 1005 bool IsWide; 1006public: 1007 // type should be IntTy 1008 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 1009 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1010 false), 1011 Value(value), Loc(l), IsWide(iswide) { 1012 } 1013 1014 /// \brief Construct an empty character literal. 1015 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1016 1017 SourceLocation getLocation() const { return Loc; } 1018 bool isWide() const { return IsWide; } 1019 1020 SourceRange getSourceRange() const { return SourceRange(Loc); } 1021 1022 unsigned getValue() const { return Value; } 1023 1024 void setLocation(SourceLocation Location) { Loc = Location; } 1025 void setWide(bool W) { IsWide = W; } 1026 void setValue(unsigned Val) { Value = Val; } 1027 1028 static bool classof(const Stmt *T) { 1029 return T->getStmtClass() == CharacterLiteralClass; 1030 } 1031 static bool classof(const CharacterLiteral *) { return true; } 1032 1033 // Iterators 1034 child_range children() { return child_range(); } 1035}; 1036 1037class FloatingLiteral : public Expr { 1038 APFloatStorage Num; 1039 bool IsExact : 1; 1040 SourceLocation Loc; 1041 1042 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1043 QualType Type, SourceLocation L) 1044 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1045 false), 1046 IsExact(isexact), Loc(L) { 1047 setValue(C, V); 1048 } 1049 1050 /// \brief Construct an empty floating-point literal. 1051 explicit FloatingLiteral(EmptyShell Empty) 1052 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1053 1054public: 1055 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1056 bool isexact, QualType Type, SourceLocation L); 1057 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1058 1059 llvm::APFloat getValue() const { return Num.getValue(); } 1060 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1061 Num.setValue(C, Val); 1062 } 1063 1064 bool isExact() const { return IsExact; } 1065 void setExact(bool E) { IsExact = E; } 1066 1067 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1068 /// double. Note that this may cause loss of precision, but is useful for 1069 /// debugging dumps, etc. 1070 double getValueAsApproximateDouble() const; 1071 1072 SourceLocation getLocation() const { return Loc; } 1073 void setLocation(SourceLocation L) { Loc = L; } 1074 1075 SourceRange getSourceRange() const { return SourceRange(Loc); } 1076 1077 static bool classof(const Stmt *T) { 1078 return T->getStmtClass() == FloatingLiteralClass; 1079 } 1080 static bool classof(const FloatingLiteral *) { return true; } 1081 1082 // Iterators 1083 child_range children() { return child_range(); } 1084}; 1085 1086/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1087/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1088/// IntegerLiteral classes. Instances of this class always have a Complex type 1089/// whose element type matches the subexpression. 1090/// 1091class ImaginaryLiteral : public Expr { 1092 Stmt *Val; 1093public: 1094 ImaginaryLiteral(Expr *val, QualType Ty) 1095 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1096 false), 1097 Val(val) {} 1098 1099 /// \brief Build an empty imaginary literal. 1100 explicit ImaginaryLiteral(EmptyShell Empty) 1101 : Expr(ImaginaryLiteralClass, Empty) { } 1102 1103 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1104 Expr *getSubExpr() { return cast<Expr>(Val); } 1105 void setSubExpr(Expr *E) { Val = E; } 1106 1107 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1108 static bool classof(const Stmt *T) { 1109 return T->getStmtClass() == ImaginaryLiteralClass; 1110 } 1111 static bool classof(const ImaginaryLiteral *) { return true; } 1112 1113 // Iterators 1114 child_range children() { return child_range(&Val, &Val+1); } 1115}; 1116 1117/// StringLiteral - This represents a string literal expression, e.g. "foo" 1118/// or L"bar" (wide strings). The actual string is returned by getStrData() 1119/// is NOT null-terminated, and the length of the string is determined by 1120/// calling getByteLength(). The C type for a string is always a 1121/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1122/// not. 1123/// 1124/// Note that strings in C can be formed by concatenation of multiple string 1125/// literal pptokens in translation phase #6. This keeps track of the locations 1126/// of each of these pieces. 1127/// 1128/// Strings in C can also be truncated and extended by assigning into arrays, 1129/// e.g. with constructs like: 1130/// char X[2] = "foobar"; 1131/// In this case, getByteLength() will return 6, but the string literal will 1132/// have type "char[2]". 1133class StringLiteral : public Expr { 1134 const char *StrData; 1135 unsigned ByteLength; 1136 bool IsWide; 1137 unsigned NumConcatenated; 1138 SourceLocation TokLocs[1]; 1139 1140 StringLiteral(QualType Ty) : 1141 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1142 1143public: 1144 /// This is the "fully general" constructor that allows representation of 1145 /// strings formed from multiple concatenated tokens. 1146 static StringLiteral *Create(ASTContext &C, const char *StrData, 1147 unsigned ByteLength, bool Wide, QualType Ty, 1148 const SourceLocation *Loc, unsigned NumStrs); 1149 1150 /// Simple constructor for string literals made from one token. 1151 static StringLiteral *Create(ASTContext &C, const char *StrData, 1152 unsigned ByteLength, 1153 bool Wide, QualType Ty, SourceLocation Loc) { 1154 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1155 } 1156 1157 /// \brief Construct an empty string literal. 1158 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1159 1160 llvm::StringRef getString() const { 1161 return llvm::StringRef(StrData, ByteLength); 1162 } 1163 1164 unsigned getByteLength() const { return ByteLength; } 1165 1166 /// \brief Sets the string data to the given string data. 1167 void setString(ASTContext &C, llvm::StringRef Str); 1168 1169 bool isWide() const { return IsWide; } 1170 void setWide(bool W) { IsWide = W; } 1171 1172 bool containsNonAsciiOrNull() const { 1173 llvm::StringRef Str = getString(); 1174 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1175 if (!isascii(Str[i]) || !Str[i]) 1176 return true; 1177 return false; 1178 } 1179 /// getNumConcatenated - Get the number of string literal tokens that were 1180 /// concatenated in translation phase #6 to form this string literal. 1181 unsigned getNumConcatenated() const { return NumConcatenated; } 1182 1183 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1184 assert(TokNum < NumConcatenated && "Invalid tok number"); 1185 return TokLocs[TokNum]; 1186 } 1187 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1188 assert(TokNum < NumConcatenated && "Invalid tok number"); 1189 TokLocs[TokNum] = L; 1190 } 1191 1192 /// getLocationOfByte - Return a source location that points to the specified 1193 /// byte of this string literal. 1194 /// 1195 /// Strings are amazingly complex. They can be formed from multiple tokens 1196 /// and can have escape sequences in them in addition to the usual trigraph 1197 /// and escaped newline business. This routine handles this complexity. 1198 /// 1199 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1200 const LangOptions &Features, 1201 const TargetInfo &Target) const; 1202 1203 typedef const SourceLocation *tokloc_iterator; 1204 tokloc_iterator tokloc_begin() const { return TokLocs; } 1205 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1206 1207 SourceRange getSourceRange() const { 1208 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1209 } 1210 static bool classof(const Stmt *T) { 1211 return T->getStmtClass() == StringLiteralClass; 1212 } 1213 static bool classof(const StringLiteral *) { return true; } 1214 1215 // Iterators 1216 child_range children() { return child_range(); } 1217}; 1218 1219/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1220/// AST node is only formed if full location information is requested. 1221class ParenExpr : public Expr { 1222 SourceLocation L, R; 1223 Stmt *Val; 1224public: 1225 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1226 : Expr(ParenExprClass, val->getType(), 1227 val->getValueKind(), val->getObjectKind(), 1228 val->isTypeDependent(), val->isValueDependent(), 1229 val->containsUnexpandedParameterPack()), 1230 L(l), R(r), Val(val) {} 1231 1232 /// \brief Construct an empty parenthesized expression. 1233 explicit ParenExpr(EmptyShell Empty) 1234 : Expr(ParenExprClass, Empty) { } 1235 1236 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1237 Expr *getSubExpr() { return cast<Expr>(Val); } 1238 void setSubExpr(Expr *E) { Val = E; } 1239 1240 SourceRange getSourceRange() const { return SourceRange(L, R); } 1241 1242 /// \brief Get the location of the left parentheses '('. 1243 SourceLocation getLParen() const { return L; } 1244 void setLParen(SourceLocation Loc) { L = Loc; } 1245 1246 /// \brief Get the location of the right parentheses ')'. 1247 SourceLocation getRParen() const { return R; } 1248 void setRParen(SourceLocation Loc) { R = Loc; } 1249 1250 static bool classof(const Stmt *T) { 1251 return T->getStmtClass() == ParenExprClass; 1252 } 1253 static bool classof(const ParenExpr *) { return true; } 1254 1255 // Iterators 1256 child_range children() { return child_range(&Val, &Val+1); } 1257}; 1258 1259 1260/// UnaryOperator - This represents the unary-expression's (except sizeof and 1261/// alignof), the postinc/postdec operators from postfix-expression, and various 1262/// extensions. 1263/// 1264/// Notes on various nodes: 1265/// 1266/// Real/Imag - These return the real/imag part of a complex operand. If 1267/// applied to a non-complex value, the former returns its operand and the 1268/// later returns zero in the type of the operand. 1269/// 1270class UnaryOperator : public Expr { 1271public: 1272 typedef UnaryOperatorKind Opcode; 1273 1274private: 1275 unsigned Opc : 5; 1276 SourceLocation Loc; 1277 Stmt *Val; 1278public: 1279 1280 UnaryOperator(Expr *input, Opcode opc, QualType type, 1281 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1282 : Expr(UnaryOperatorClass, type, VK, OK, 1283 input->isTypeDependent() || type->isDependentType(), 1284 input->isValueDependent(), 1285 input->containsUnexpandedParameterPack()), 1286 Opc(opc), Loc(l), Val(input) {} 1287 1288 /// \brief Build an empty unary operator. 1289 explicit UnaryOperator(EmptyShell Empty) 1290 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1291 1292 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1293 void setOpcode(Opcode O) { Opc = O; } 1294 1295 Expr *getSubExpr() const { return cast<Expr>(Val); } 1296 void setSubExpr(Expr *E) { Val = E; } 1297 1298 /// getOperatorLoc - Return the location of the operator. 1299 SourceLocation getOperatorLoc() const { return Loc; } 1300 void setOperatorLoc(SourceLocation L) { Loc = L; } 1301 1302 /// isPostfix - Return true if this is a postfix operation, like x++. 1303 static bool isPostfix(Opcode Op) { 1304 return Op == UO_PostInc || Op == UO_PostDec; 1305 } 1306 1307 /// isPrefix - Return true if this is a prefix operation, like --x. 1308 static bool isPrefix(Opcode Op) { 1309 return Op == UO_PreInc || Op == UO_PreDec; 1310 } 1311 1312 bool isPrefix() const { return isPrefix(getOpcode()); } 1313 bool isPostfix() const { return isPostfix(getOpcode()); } 1314 bool isIncrementOp() const { 1315 return Opc == UO_PreInc || Opc == UO_PostInc; 1316 } 1317 bool isIncrementDecrementOp() const { 1318 return Opc <= UO_PreDec; 1319 } 1320 static bool isArithmeticOp(Opcode Op) { 1321 return Op >= UO_Plus && Op <= UO_LNot; 1322 } 1323 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1324 1325 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1326 /// corresponds to, e.g. "sizeof" or "[pre]++" 1327 static const char *getOpcodeStr(Opcode Op); 1328 1329 /// \brief Retrieve the unary opcode that corresponds to the given 1330 /// overloaded operator. 1331 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1332 1333 /// \brief Retrieve the overloaded operator kind that corresponds to 1334 /// the given unary opcode. 1335 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1336 1337 SourceRange getSourceRange() const { 1338 if (isPostfix()) 1339 return SourceRange(Val->getLocStart(), Loc); 1340 else 1341 return SourceRange(Loc, Val->getLocEnd()); 1342 } 1343 SourceLocation getExprLoc() const { return Loc; } 1344 1345 static bool classof(const Stmt *T) { 1346 return T->getStmtClass() == UnaryOperatorClass; 1347 } 1348 static bool classof(const UnaryOperator *) { return true; } 1349 1350 // Iterators 1351 child_range children() { return child_range(&Val, &Val+1); } 1352}; 1353 1354/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1355/// offsetof(record-type, member-designator). For example, given: 1356/// @code 1357/// struct S { 1358/// float f; 1359/// double d; 1360/// }; 1361/// struct T { 1362/// int i; 1363/// struct S s[10]; 1364/// }; 1365/// @endcode 1366/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1367 1368class OffsetOfExpr : public Expr { 1369public: 1370 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1371 class OffsetOfNode { 1372 public: 1373 /// \brief The kind of offsetof node we have. 1374 enum Kind { 1375 /// \brief An index into an array. 1376 Array = 0x00, 1377 /// \brief A field. 1378 Field = 0x01, 1379 /// \brief A field in a dependent type, known only by its name. 1380 Identifier = 0x02, 1381 /// \brief An implicit indirection through a C++ base class, when the 1382 /// field found is in a base class. 1383 Base = 0x03 1384 }; 1385 1386 private: 1387 enum { MaskBits = 2, Mask = 0x03 }; 1388 1389 /// \brief The source range that covers this part of the designator. 1390 SourceRange Range; 1391 1392 /// \brief The data describing the designator, which comes in three 1393 /// different forms, depending on the lower two bits. 1394 /// - An unsigned index into the array of Expr*'s stored after this node 1395 /// in memory, for [constant-expression] designators. 1396 /// - A FieldDecl*, for references to a known field. 1397 /// - An IdentifierInfo*, for references to a field with a given name 1398 /// when the class type is dependent. 1399 /// - A CXXBaseSpecifier*, for references that look at a field in a 1400 /// base class. 1401 uintptr_t Data; 1402 1403 public: 1404 /// \brief Create an offsetof node that refers to an array element. 1405 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1406 SourceLocation RBracketLoc) 1407 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1408 1409 /// \brief Create an offsetof node that refers to a field. 1410 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1411 SourceLocation NameLoc) 1412 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1413 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1414 1415 /// \brief Create an offsetof node that refers to an identifier. 1416 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1417 SourceLocation NameLoc) 1418 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1419 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1420 1421 /// \brief Create an offsetof node that refers into a C++ base class. 1422 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1423 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1424 1425 /// \brief Determine what kind of offsetof node this is. 1426 Kind getKind() const { 1427 return static_cast<Kind>(Data & Mask); 1428 } 1429 1430 /// \brief For an array element node, returns the index into the array 1431 /// of expressions. 1432 unsigned getArrayExprIndex() const { 1433 assert(getKind() == Array); 1434 return Data >> 2; 1435 } 1436 1437 /// \brief For a field offsetof node, returns the field. 1438 FieldDecl *getField() const { 1439 assert(getKind() == Field); 1440 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1441 } 1442 1443 /// \brief For a field or identifier offsetof node, returns the name of 1444 /// the field. 1445 IdentifierInfo *getFieldName() const; 1446 1447 /// \brief For a base class node, returns the base specifier. 1448 CXXBaseSpecifier *getBase() const { 1449 assert(getKind() == Base); 1450 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1451 } 1452 1453 /// \brief Retrieve the source range that covers this offsetof node. 1454 /// 1455 /// For an array element node, the source range contains the locations of 1456 /// the square brackets. For a field or identifier node, the source range 1457 /// contains the location of the period (if there is one) and the 1458 /// identifier. 1459 SourceRange getRange() const { return Range; } 1460 }; 1461 1462private: 1463 1464 SourceLocation OperatorLoc, RParenLoc; 1465 // Base type; 1466 TypeSourceInfo *TSInfo; 1467 // Number of sub-components (i.e. instances of OffsetOfNode). 1468 unsigned NumComps; 1469 // Number of sub-expressions (i.e. array subscript expressions). 1470 unsigned NumExprs; 1471 1472 OffsetOfExpr(ASTContext &C, QualType type, 1473 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1474 OffsetOfNode* compsPtr, unsigned numComps, 1475 Expr** exprsPtr, unsigned numExprs, 1476 SourceLocation RParenLoc); 1477 1478 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1479 : Expr(OffsetOfExprClass, EmptyShell()), 1480 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1481 1482public: 1483 1484 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1485 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1486 OffsetOfNode* compsPtr, unsigned numComps, 1487 Expr** exprsPtr, unsigned numExprs, 1488 SourceLocation RParenLoc); 1489 1490 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1491 unsigned NumComps, unsigned NumExprs); 1492 1493 /// getOperatorLoc - Return the location of the operator. 1494 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1495 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1496 1497 /// \brief Return the location of the right parentheses. 1498 SourceLocation getRParenLoc() const { return RParenLoc; } 1499 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1500 1501 TypeSourceInfo *getTypeSourceInfo() const { 1502 return TSInfo; 1503 } 1504 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1505 TSInfo = tsi; 1506 } 1507 1508 const OffsetOfNode &getComponent(unsigned Idx) { 1509 assert(Idx < NumComps && "Subscript out of range"); 1510 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1511 } 1512 1513 void setComponent(unsigned Idx, OffsetOfNode ON) { 1514 assert(Idx < NumComps && "Subscript out of range"); 1515 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1516 } 1517 1518 unsigned getNumComponents() const { 1519 return NumComps; 1520 } 1521 1522 Expr* getIndexExpr(unsigned Idx) { 1523 assert(Idx < NumExprs && "Subscript out of range"); 1524 return reinterpret_cast<Expr **>( 1525 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1526 } 1527 1528 void setIndexExpr(unsigned Idx, Expr* E) { 1529 assert(Idx < NumComps && "Subscript out of range"); 1530 reinterpret_cast<Expr **>( 1531 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1532 } 1533 1534 unsigned getNumExpressions() const { 1535 return NumExprs; 1536 } 1537 1538 SourceRange getSourceRange() const { 1539 return SourceRange(OperatorLoc, RParenLoc); 1540 } 1541 1542 static bool classof(const Stmt *T) { 1543 return T->getStmtClass() == OffsetOfExprClass; 1544 } 1545 1546 static bool classof(const OffsetOfExpr *) { return true; } 1547 1548 // Iterators 1549 child_range children() { 1550 Stmt **begin = 1551 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1552 + NumComps); 1553 return child_range(begin, begin + NumExprs); 1554 } 1555}; 1556 1557/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1558/// types and expressions. 1559class SizeOfAlignOfExpr : public Expr { 1560 bool isSizeof : 1; // true if sizeof, false if alignof. 1561 bool isType : 1; // true if operand is a type, false if an expression 1562 union { 1563 TypeSourceInfo *Ty; 1564 Stmt *Ex; 1565 } Argument; 1566 SourceLocation OpLoc, RParenLoc; 1567 1568public: 1569 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1570 QualType resultType, SourceLocation op, 1571 SourceLocation rp) : 1572 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1573 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1574 // Value-dependent if the argument is type-dependent. 1575 TInfo->getType()->isDependentType(), 1576 TInfo->getType()->containsUnexpandedParameterPack()), 1577 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1578 Argument.Ty = TInfo; 1579 } 1580 1581 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1582 QualType resultType, SourceLocation op, 1583 SourceLocation rp) : 1584 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1585 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1586 // Value-dependent if the argument is type-dependent. 1587 E->isTypeDependent(), 1588 E->containsUnexpandedParameterPack()), 1589 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1590 Argument.Ex = E; 1591 } 1592 1593 /// \brief Construct an empty sizeof/alignof expression. 1594 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1595 : Expr(SizeOfAlignOfExprClass, Empty) { } 1596 1597 bool isSizeOf() const { return isSizeof; } 1598 void setSizeof(bool S) { isSizeof = S; } 1599 1600 bool isArgumentType() const { return isType; } 1601 QualType getArgumentType() const { 1602 return getArgumentTypeInfo()->getType(); 1603 } 1604 TypeSourceInfo *getArgumentTypeInfo() const { 1605 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1606 return Argument.Ty; 1607 } 1608 Expr *getArgumentExpr() { 1609 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1610 return static_cast<Expr*>(Argument.Ex); 1611 } 1612 const Expr *getArgumentExpr() const { 1613 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1614 } 1615 1616 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1617 void setArgument(TypeSourceInfo *TInfo) { 1618 Argument.Ty = TInfo; 1619 isType = true; 1620 } 1621 1622 /// Gets the argument type, or the type of the argument expression, whichever 1623 /// is appropriate. 1624 QualType getTypeOfArgument() const { 1625 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1626 } 1627 1628 SourceLocation getOperatorLoc() const { return OpLoc; } 1629 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1630 1631 SourceLocation getRParenLoc() const { return RParenLoc; } 1632 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1633 1634 SourceRange getSourceRange() const { 1635 return SourceRange(OpLoc, RParenLoc); 1636 } 1637 1638 static bool classof(const Stmt *T) { 1639 return T->getStmtClass() == SizeOfAlignOfExprClass; 1640 } 1641 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1642 1643 // Iterators 1644 child_range children(); 1645}; 1646 1647//===----------------------------------------------------------------------===// 1648// Postfix Operators. 1649//===----------------------------------------------------------------------===// 1650 1651/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1652class ArraySubscriptExpr : public Expr { 1653 enum { LHS, RHS, END_EXPR=2 }; 1654 Stmt* SubExprs[END_EXPR]; 1655 SourceLocation RBracketLoc; 1656public: 1657 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1658 ExprValueKind VK, ExprObjectKind OK, 1659 SourceLocation rbracketloc) 1660 : Expr(ArraySubscriptExprClass, t, VK, OK, 1661 lhs->isTypeDependent() || rhs->isTypeDependent(), 1662 lhs->isValueDependent() || rhs->isValueDependent(), 1663 (lhs->containsUnexpandedParameterPack() || 1664 rhs->containsUnexpandedParameterPack())), 1665 RBracketLoc(rbracketloc) { 1666 SubExprs[LHS] = lhs; 1667 SubExprs[RHS] = rhs; 1668 } 1669 1670 /// \brief Create an empty array subscript expression. 1671 explicit ArraySubscriptExpr(EmptyShell Shell) 1672 : Expr(ArraySubscriptExprClass, Shell) { } 1673 1674 /// An array access can be written A[4] or 4[A] (both are equivalent). 1675 /// - getBase() and getIdx() always present the normalized view: A[4]. 1676 /// In this case getBase() returns "A" and getIdx() returns "4". 1677 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1678 /// 4[A] getLHS() returns "4". 1679 /// Note: Because vector element access is also written A[4] we must 1680 /// predicate the format conversion in getBase and getIdx only on the 1681 /// the type of the RHS, as it is possible for the LHS to be a vector of 1682 /// integer type 1683 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1684 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1685 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1686 1687 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1688 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1689 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1690 1691 Expr *getBase() { 1692 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1693 } 1694 1695 const Expr *getBase() const { 1696 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1697 } 1698 1699 Expr *getIdx() { 1700 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1701 } 1702 1703 const Expr *getIdx() const { 1704 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1705 } 1706 1707 SourceRange getSourceRange() const { 1708 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1709 } 1710 1711 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1712 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1713 1714 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1715 1716 static bool classof(const Stmt *T) { 1717 return T->getStmtClass() == ArraySubscriptExprClass; 1718 } 1719 static bool classof(const ArraySubscriptExpr *) { return true; } 1720 1721 // Iterators 1722 child_range children() { 1723 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1724 } 1725}; 1726 1727 1728/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1729/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1730/// while its subclasses may represent alternative syntax that (semantically) 1731/// results in a function call. For example, CXXOperatorCallExpr is 1732/// a subclass for overloaded operator calls that use operator syntax, e.g., 1733/// "str1 + str2" to resolve to a function call. 1734class CallExpr : public Expr { 1735 enum { FN=0, PREARGS_START=1 }; 1736 Stmt **SubExprs; 1737 unsigned NumArgs; 1738 SourceLocation RParenLoc; 1739 1740protected: 1741 // These versions of the constructor are for derived classes. 1742 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1743 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1744 SourceLocation rparenloc); 1745 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1746 1747 Stmt *getPreArg(unsigned i) { 1748 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1749 return SubExprs[PREARGS_START+i]; 1750 } 1751 const Stmt *getPreArg(unsigned i) const { 1752 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1753 return SubExprs[PREARGS_START+i]; 1754 } 1755 void setPreArg(unsigned i, Stmt *PreArg) { 1756 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1757 SubExprs[PREARGS_START+i] = PreArg; 1758 } 1759 1760 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1761 1762public: 1763 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1764 ExprValueKind VK, SourceLocation rparenloc); 1765 1766 /// \brief Build an empty call expression. 1767 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1768 1769 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1770 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1771 void setCallee(Expr *F) { SubExprs[FN] = F; } 1772 1773 Decl *getCalleeDecl(); 1774 const Decl *getCalleeDecl() const { 1775 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1776 } 1777 1778 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1779 FunctionDecl *getDirectCallee(); 1780 const FunctionDecl *getDirectCallee() const { 1781 return const_cast<CallExpr*>(this)->getDirectCallee(); 1782 } 1783 1784 /// getNumArgs - Return the number of actual arguments to this call. 1785 /// 1786 unsigned getNumArgs() const { return NumArgs; } 1787 1788 /// \brief Retrieve the call arguments. 1789 Expr **getArgs() { 1790 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1791 } 1792 1793 /// getArg - Return the specified argument. 1794 Expr *getArg(unsigned Arg) { 1795 assert(Arg < NumArgs && "Arg access out of range!"); 1796 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1797 } 1798 const Expr *getArg(unsigned Arg) const { 1799 assert(Arg < NumArgs && "Arg access out of range!"); 1800 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1801 } 1802 1803 /// setArg - Set the specified argument. 1804 void setArg(unsigned Arg, Expr *ArgExpr) { 1805 assert(Arg < NumArgs && "Arg access out of range!"); 1806 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1807 } 1808 1809 /// setNumArgs - This changes the number of arguments present in this call. 1810 /// Any orphaned expressions are deleted by this, and any new operands are set 1811 /// to null. 1812 void setNumArgs(ASTContext& C, unsigned NumArgs); 1813 1814 typedef ExprIterator arg_iterator; 1815 typedef ConstExprIterator const_arg_iterator; 1816 1817 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1818 arg_iterator arg_end() { 1819 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1820 } 1821 const_arg_iterator arg_begin() const { 1822 return SubExprs+PREARGS_START+getNumPreArgs(); 1823 } 1824 const_arg_iterator arg_end() const { 1825 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1826 } 1827 1828 /// getNumCommas - Return the number of commas that must have been present in 1829 /// this function call. 1830 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1831 1832 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1833 /// not, return 0. 1834 unsigned isBuiltinCall(const ASTContext &Context) const; 1835 1836 /// getCallReturnType - Get the return type of the call expr. This is not 1837 /// always the type of the expr itself, if the return type is a reference 1838 /// type. 1839 QualType getCallReturnType() const; 1840 1841 SourceLocation getRParenLoc() const { return RParenLoc; } 1842 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1843 1844 SourceRange getSourceRange() const; 1845 1846 static bool classof(const Stmt *T) { 1847 return T->getStmtClass() >= firstCallExprConstant && 1848 T->getStmtClass() <= lastCallExprConstant; 1849 } 1850 static bool classof(const CallExpr *) { return true; } 1851 1852 // Iterators 1853 child_range children() { 1854 return child_range(&SubExprs[0], 1855 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1856 } 1857}; 1858 1859/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1860/// 1861class MemberExpr : public Expr { 1862 /// Extra data stored in some member expressions. 1863 struct MemberNameQualifier : public NameQualifier { 1864 DeclAccessPair FoundDecl; 1865 }; 1866 1867 /// Base - the expression for the base pointer or structure references. In 1868 /// X.F, this is "X". 1869 Stmt *Base; 1870 1871 /// MemberDecl - This is the decl being referenced by the field/member name. 1872 /// In X.F, this is the decl referenced by F. 1873 ValueDecl *MemberDecl; 1874 1875 /// MemberLoc - This is the location of the member name. 1876 SourceLocation MemberLoc; 1877 1878 /// MemberDNLoc - Provides source/type location info for the 1879 /// declaration name embedded in MemberDecl. 1880 DeclarationNameLoc MemberDNLoc; 1881 1882 /// IsArrow - True if this is "X->F", false if this is "X.F". 1883 bool IsArrow : 1; 1884 1885 /// \brief True if this member expression used a nested-name-specifier to 1886 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1887 /// declaration. When true, a MemberNameQualifier 1888 /// structure is allocated immediately after the MemberExpr. 1889 bool HasQualifierOrFoundDecl : 1; 1890 1891 /// \brief True if this member expression specified a template argument list 1892 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1893 /// structure (and its TemplateArguments) are allocated immediately after 1894 /// the MemberExpr or, if the member expression also has a qualifier, after 1895 /// the MemberNameQualifier structure. 1896 bool HasExplicitTemplateArgumentList : 1; 1897 1898 /// \brief Retrieve the qualifier that preceded the member name, if any. 1899 MemberNameQualifier *getMemberQualifier() { 1900 assert(HasQualifierOrFoundDecl); 1901 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1902 } 1903 1904 /// \brief Retrieve the qualifier that preceded the member name, if any. 1905 const MemberNameQualifier *getMemberQualifier() const { 1906 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1907 } 1908 1909public: 1910 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1911 const DeclarationNameInfo &NameInfo, QualType ty, 1912 ExprValueKind VK, ExprObjectKind OK) 1913 : Expr(MemberExprClass, ty, VK, OK, 1914 base->isTypeDependent(), base->isValueDependent(), 1915 base->containsUnexpandedParameterPack()), 1916 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1917 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1918 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1919 assert(memberdecl->getDeclName() == NameInfo.getName()); 1920 } 1921 1922 // NOTE: this constructor should be used only when it is known that 1923 // the member name can not provide additional syntactic info 1924 // (i.e., source locations for C++ operator names or type source info 1925 // for constructors, destructors and conversion oeprators). 1926 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1927 SourceLocation l, QualType ty, 1928 ExprValueKind VK, ExprObjectKind OK) 1929 : Expr(MemberExprClass, ty, VK, OK, 1930 base->isTypeDependent(), base->isValueDependent(), 1931 base->containsUnexpandedParameterPack()), 1932 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1933 IsArrow(isarrow), 1934 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1935 1936 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1937 NestedNameSpecifierLoc QualifierLoc, 1938 ValueDecl *memberdecl, DeclAccessPair founddecl, 1939 DeclarationNameInfo MemberNameInfo, 1940 const TemplateArgumentListInfo *targs, 1941 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1942 1943 void setBase(Expr *E) { Base = E; } 1944 Expr *getBase() const { return cast<Expr>(Base); } 1945 1946 /// \brief Retrieve the member declaration to which this expression refers. 1947 /// 1948 /// The returned declaration will either be a FieldDecl or (in C++) 1949 /// a CXXMethodDecl. 1950 ValueDecl *getMemberDecl() const { return MemberDecl; } 1951 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1952 1953 /// \brief Retrieves the declaration found by lookup. 1954 DeclAccessPair getFoundDecl() const { 1955 if (!HasQualifierOrFoundDecl) 1956 return DeclAccessPair::make(getMemberDecl(), 1957 getMemberDecl()->getAccess()); 1958 return getMemberQualifier()->FoundDecl; 1959 } 1960 1961 /// \brief Determines whether this member expression actually had 1962 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1963 /// x->Base::foo. 1964 bool hasQualifier() const { return getQualifier() != 0; } 1965 1966 /// \brief If the member name was qualified, retrieves the 1967 /// nested-name-specifier that precedes the member name. Otherwise, returns 1968 /// NULL. 1969 NestedNameSpecifier *getQualifier() const { 1970 if (!HasQualifierOrFoundDecl) 1971 return 0; 1972 1973 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 1974 } 1975 1976 /// \brief If the member name was qualified, retrieves the 1977 /// nested-name-specifier that precedes the member name, with source-location 1978 /// information. 1979 NestedNameSpecifierLoc getQualifierLoc() const { 1980 if (!hasQualifier()) 1981 return NestedNameSpecifierLoc(); 1982 1983 return getMemberQualifier()->QualifierLoc; 1984 } 1985 1986 /// \brief Determines whether this member expression actually had a C++ 1987 /// template argument list explicitly specified, e.g., x.f<int>. 1988 bool hasExplicitTemplateArgs() const { 1989 return HasExplicitTemplateArgumentList; 1990 } 1991 1992 /// \brief Copies the template arguments (if present) into the given 1993 /// structure. 1994 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1995 if (hasExplicitTemplateArgs()) 1996 getExplicitTemplateArgs().copyInto(List); 1997 } 1998 1999 /// \brief Retrieve the explicit template argument list that 2000 /// follow the member template name. This must only be called on an 2001 /// expression with explicit template arguments. 2002 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 2003 assert(HasExplicitTemplateArgumentList); 2004 if (!HasQualifierOrFoundDecl) 2005 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 2006 2007 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 2008 getMemberQualifier() + 1); 2009 } 2010 2011 /// \brief Retrieve the explicit template argument list that 2012 /// followed the member template name. This must only be called on 2013 /// an expression with explicit template arguments. 2014 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2015 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2016 } 2017 2018 /// \brief Retrieves the optional explicit template arguments. 2019 /// This points to the same data as getExplicitTemplateArgs(), but 2020 /// returns null if there are no explicit template arguments. 2021 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2022 if (!hasExplicitTemplateArgs()) return 0; 2023 return &getExplicitTemplateArgs(); 2024 } 2025 2026 /// \brief Retrieve the location of the left angle bracket following the 2027 /// member name ('<'), if any. 2028 SourceLocation getLAngleLoc() const { 2029 if (!HasExplicitTemplateArgumentList) 2030 return SourceLocation(); 2031 2032 return getExplicitTemplateArgs().LAngleLoc; 2033 } 2034 2035 /// \brief Retrieve the template arguments provided as part of this 2036 /// template-id. 2037 const TemplateArgumentLoc *getTemplateArgs() const { 2038 if (!HasExplicitTemplateArgumentList) 2039 return 0; 2040 2041 return getExplicitTemplateArgs().getTemplateArgs(); 2042 } 2043 2044 /// \brief Retrieve the number of template arguments provided as part of this 2045 /// template-id. 2046 unsigned getNumTemplateArgs() const { 2047 if (!HasExplicitTemplateArgumentList) 2048 return 0; 2049 2050 return getExplicitTemplateArgs().NumTemplateArgs; 2051 } 2052 2053 /// \brief Retrieve the location of the right angle bracket following the 2054 /// template arguments ('>'). 2055 SourceLocation getRAngleLoc() const { 2056 if (!HasExplicitTemplateArgumentList) 2057 return SourceLocation(); 2058 2059 return getExplicitTemplateArgs().RAngleLoc; 2060 } 2061 2062 /// \brief Retrieve the member declaration name info. 2063 DeclarationNameInfo getMemberNameInfo() const { 2064 return DeclarationNameInfo(MemberDecl->getDeclName(), 2065 MemberLoc, MemberDNLoc); 2066 } 2067 2068 bool isArrow() const { return IsArrow; } 2069 void setArrow(bool A) { IsArrow = A; } 2070 2071 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2072 /// location of 'F'. 2073 SourceLocation getMemberLoc() const { return MemberLoc; } 2074 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2075 2076 SourceRange getSourceRange() const; 2077 2078 SourceLocation getExprLoc() const { return MemberLoc; } 2079 2080 /// \brief Determine whether the base of this explicit is implicit. 2081 bool isImplicitAccess() const { 2082 return getBase() && getBase()->isImplicitCXXThis(); 2083 } 2084 2085 static bool classof(const Stmt *T) { 2086 return T->getStmtClass() == MemberExprClass; 2087 } 2088 static bool classof(const MemberExpr *) { return true; } 2089 2090 // Iterators 2091 child_range children() { return child_range(&Base, &Base+1); } 2092 2093 friend class ASTReader; 2094 friend class ASTStmtWriter; 2095}; 2096 2097/// CompoundLiteralExpr - [C99 6.5.2.5] 2098/// 2099class CompoundLiteralExpr : public Expr { 2100 /// LParenLoc - If non-null, this is the location of the left paren in a 2101 /// compound literal like "(int){4}". This can be null if this is a 2102 /// synthesized compound expression. 2103 SourceLocation LParenLoc; 2104 2105 /// The type as written. This can be an incomplete array type, in 2106 /// which case the actual expression type will be different. 2107 TypeSourceInfo *TInfo; 2108 Stmt *Init; 2109 bool FileScope; 2110public: 2111 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2112 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2113 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2114 tinfo->getType()->isDependentType(), 2115 init->isValueDependent(), 2116 init->containsUnexpandedParameterPack()), 2117 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2118 2119 /// \brief Construct an empty compound literal. 2120 explicit CompoundLiteralExpr(EmptyShell Empty) 2121 : Expr(CompoundLiteralExprClass, Empty) { } 2122 2123 const Expr *getInitializer() const { return cast<Expr>(Init); } 2124 Expr *getInitializer() { return cast<Expr>(Init); } 2125 void setInitializer(Expr *E) { Init = E; } 2126 2127 bool isFileScope() const { return FileScope; } 2128 void setFileScope(bool FS) { FileScope = FS; } 2129 2130 SourceLocation getLParenLoc() const { return LParenLoc; } 2131 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2132 2133 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2134 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2135 2136 SourceRange getSourceRange() const { 2137 // FIXME: Init should never be null. 2138 if (!Init) 2139 return SourceRange(); 2140 if (LParenLoc.isInvalid()) 2141 return Init->getSourceRange(); 2142 return SourceRange(LParenLoc, Init->getLocEnd()); 2143 } 2144 2145 static bool classof(const Stmt *T) { 2146 return T->getStmtClass() == CompoundLiteralExprClass; 2147 } 2148 static bool classof(const CompoundLiteralExpr *) { return true; } 2149 2150 // Iterators 2151 child_range children() { return child_range(&Init, &Init+1); } 2152}; 2153 2154/// CastExpr - Base class for type casts, including both implicit 2155/// casts (ImplicitCastExpr) and explicit casts that have some 2156/// representation in the source code (ExplicitCastExpr's derived 2157/// classes). 2158class CastExpr : public Expr { 2159public: 2160 typedef clang::CastKind CastKind; 2161 2162private: 2163 Stmt *Op; 2164 2165 void CheckCastConsistency() const { 2166#ifndef NDEBUG 2167 switch (getCastKind()) { 2168 case CK_DerivedToBase: 2169 case CK_UncheckedDerivedToBase: 2170 case CK_DerivedToBaseMemberPointer: 2171 case CK_BaseToDerived: 2172 case CK_BaseToDerivedMemberPointer: 2173 assert(!path_empty() && "Cast kind should have a base path!"); 2174 break; 2175 2176 // These should not have an inheritance path. 2177 case CK_BitCast: 2178 case CK_Dynamic: 2179 case CK_ToUnion: 2180 case CK_ArrayToPointerDecay: 2181 case CK_FunctionToPointerDecay: 2182 case CK_NullToMemberPointer: 2183 case CK_NullToPointer: 2184 case CK_ConstructorConversion: 2185 case CK_IntegralToPointer: 2186 case CK_PointerToIntegral: 2187 case CK_ToVoid: 2188 case CK_VectorSplat: 2189 case CK_IntegralCast: 2190 case CK_IntegralToFloating: 2191 case CK_FloatingToIntegral: 2192 case CK_FloatingCast: 2193 case CK_AnyPointerToObjCPointerCast: 2194 case CK_AnyPointerToBlockPointerCast: 2195 case CK_ObjCObjectLValueCast: 2196 case CK_FloatingRealToComplex: 2197 case CK_FloatingComplexToReal: 2198 case CK_FloatingComplexCast: 2199 case CK_FloatingComplexToIntegralComplex: 2200 case CK_IntegralRealToComplex: 2201 case CK_IntegralComplexToReal: 2202 case CK_IntegralComplexCast: 2203 case CK_IntegralComplexToFloatingComplex: 2204 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2205 // fallthrough to check for null base path 2206 2207 case CK_Dependent: 2208 case CK_LValueToRValue: 2209 case CK_GetObjCProperty: 2210 case CK_NoOp: 2211 case CK_PointerToBoolean: 2212 case CK_IntegralToBoolean: 2213 case CK_FloatingToBoolean: 2214 case CK_MemberPointerToBoolean: 2215 case CK_FloatingComplexToBoolean: 2216 case CK_IntegralComplexToBoolean: 2217 case CK_LValueBitCast: // -> bool& 2218 case CK_UserDefinedConversion: // operator bool() 2219 assert(path_empty() && "Cast kind should not have a base path!"); 2220 break; 2221 } 2222#endif 2223 } 2224 2225 const CXXBaseSpecifier * const *path_buffer() const { 2226 return const_cast<CastExpr*>(this)->path_buffer(); 2227 } 2228 CXXBaseSpecifier **path_buffer(); 2229 2230protected: 2231 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2232 const CastKind kind, Expr *op, unsigned BasePathSize) : 2233 Expr(SC, ty, VK, OK_Ordinary, 2234 // Cast expressions are type-dependent if the type is 2235 // dependent (C++ [temp.dep.expr]p3). 2236 ty->isDependentType(), 2237 // Cast expressions are value-dependent if the type is 2238 // dependent or if the subexpression is value-dependent. 2239 ty->isDependentType() || (op && op->isValueDependent()), 2240 (ty->containsUnexpandedParameterPack() || 2241 op->containsUnexpandedParameterPack())), 2242 Op(op) { 2243 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2244 CastExprBits.Kind = kind; 2245 CastExprBits.BasePathSize = BasePathSize; 2246 CheckCastConsistency(); 2247 } 2248 2249 /// \brief Construct an empty cast. 2250 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2251 : Expr(SC, Empty) { 2252 CastExprBits.BasePathSize = BasePathSize; 2253 } 2254 2255public: 2256 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2257 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2258 const char *getCastKindName() const; 2259 2260 Expr *getSubExpr() { return cast<Expr>(Op); } 2261 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2262 void setSubExpr(Expr *E) { Op = E; } 2263 2264 /// \brief Retrieve the cast subexpression as it was written in the source 2265 /// code, looking through any implicit casts or other intermediate nodes 2266 /// introduced by semantic analysis. 2267 Expr *getSubExprAsWritten(); 2268 const Expr *getSubExprAsWritten() const { 2269 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2270 } 2271 2272 typedef CXXBaseSpecifier **path_iterator; 2273 typedef const CXXBaseSpecifier * const *path_const_iterator; 2274 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2275 unsigned path_size() const { return CastExprBits.BasePathSize; } 2276 path_iterator path_begin() { return path_buffer(); } 2277 path_iterator path_end() { return path_buffer() + path_size(); } 2278 path_const_iterator path_begin() const { return path_buffer(); } 2279 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2280 2281 void setCastPath(const CXXCastPath &Path); 2282 2283 static bool classof(const Stmt *T) { 2284 return T->getStmtClass() >= firstCastExprConstant && 2285 T->getStmtClass() <= lastCastExprConstant; 2286 } 2287 static bool classof(const CastExpr *) { return true; } 2288 2289 // Iterators 2290 child_range children() { return child_range(&Op, &Op+1); } 2291}; 2292 2293/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2294/// conversions, which have no direct representation in the original 2295/// source code. For example: converting T[]->T*, void f()->void 2296/// (*f)(), float->double, short->int, etc. 2297/// 2298/// In C, implicit casts always produce rvalues. However, in C++, an 2299/// implicit cast whose result is being bound to a reference will be 2300/// an lvalue or xvalue. For example: 2301/// 2302/// @code 2303/// class Base { }; 2304/// class Derived : public Base { }; 2305/// Derived &&ref(); 2306/// void f(Derived d) { 2307/// Base& b = d; // initializer is an ImplicitCastExpr 2308/// // to an lvalue of type Base 2309/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2310/// // to an xvalue of type Base 2311/// } 2312/// @endcode 2313class ImplicitCastExpr : public CastExpr { 2314private: 2315 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2316 unsigned BasePathLength, ExprValueKind VK) 2317 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2318 } 2319 2320 /// \brief Construct an empty implicit cast. 2321 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2322 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2323 2324public: 2325 enum OnStack_t { OnStack }; 2326 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2327 ExprValueKind VK) 2328 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2329 } 2330 2331 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2332 CastKind Kind, Expr *Operand, 2333 const CXXCastPath *BasePath, 2334 ExprValueKind Cat); 2335 2336 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2337 2338 SourceRange getSourceRange() const { 2339 return getSubExpr()->getSourceRange(); 2340 } 2341 2342 static bool classof(const Stmt *T) { 2343 return T->getStmtClass() == ImplicitCastExprClass; 2344 } 2345 static bool classof(const ImplicitCastExpr *) { return true; } 2346}; 2347 2348/// ExplicitCastExpr - An explicit cast written in the source 2349/// code. 2350/// 2351/// This class is effectively an abstract class, because it provides 2352/// the basic representation of an explicitly-written cast without 2353/// specifying which kind of cast (C cast, functional cast, static 2354/// cast, etc.) was written; specific derived classes represent the 2355/// particular style of cast and its location information. 2356/// 2357/// Unlike implicit casts, explicit cast nodes have two different 2358/// types: the type that was written into the source code, and the 2359/// actual type of the expression as determined by semantic 2360/// analysis. These types may differ slightly. For example, in C++ one 2361/// can cast to a reference type, which indicates that the resulting 2362/// expression will be an lvalue or xvalue. The reference type, however, 2363/// will not be used as the type of the expression. 2364class ExplicitCastExpr : public CastExpr { 2365 /// TInfo - Source type info for the (written) type 2366 /// this expression is casting to. 2367 TypeSourceInfo *TInfo; 2368 2369protected: 2370 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2371 CastKind kind, Expr *op, unsigned PathSize, 2372 TypeSourceInfo *writtenTy) 2373 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2374 2375 /// \brief Construct an empty explicit cast. 2376 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2377 : CastExpr(SC, Shell, PathSize) { } 2378 2379public: 2380 /// getTypeInfoAsWritten - Returns the type source info for the type 2381 /// that this expression is casting to. 2382 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2383 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2384 2385 /// getTypeAsWritten - Returns the type that this expression is 2386 /// casting to, as written in the source code. 2387 QualType getTypeAsWritten() const { return TInfo->getType(); } 2388 2389 static bool classof(const Stmt *T) { 2390 return T->getStmtClass() >= firstExplicitCastExprConstant && 2391 T->getStmtClass() <= lastExplicitCastExprConstant; 2392 } 2393 static bool classof(const ExplicitCastExpr *) { return true; } 2394}; 2395 2396/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2397/// cast in C++ (C++ [expr.cast]), which uses the syntax 2398/// (Type)expr. For example: @c (int)f. 2399class CStyleCastExpr : public ExplicitCastExpr { 2400 SourceLocation LPLoc; // the location of the left paren 2401 SourceLocation RPLoc; // the location of the right paren 2402 2403 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2404 unsigned PathSize, TypeSourceInfo *writtenTy, 2405 SourceLocation l, SourceLocation r) 2406 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2407 writtenTy), LPLoc(l), RPLoc(r) {} 2408 2409 /// \brief Construct an empty C-style explicit cast. 2410 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2411 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2412 2413public: 2414 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2415 ExprValueKind VK, CastKind K, 2416 Expr *Op, const CXXCastPath *BasePath, 2417 TypeSourceInfo *WrittenTy, SourceLocation L, 2418 SourceLocation R); 2419 2420 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2421 2422 SourceLocation getLParenLoc() const { return LPLoc; } 2423 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2424 2425 SourceLocation getRParenLoc() const { return RPLoc; } 2426 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2427 2428 SourceRange getSourceRange() const { 2429 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2430 } 2431 static bool classof(const Stmt *T) { 2432 return T->getStmtClass() == CStyleCastExprClass; 2433 } 2434 static bool classof(const CStyleCastExpr *) { return true; } 2435}; 2436 2437/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2438/// 2439/// This expression node kind describes a builtin binary operation, 2440/// such as "x + y" for integer values "x" and "y". The operands will 2441/// already have been converted to appropriate types (e.g., by 2442/// performing promotions or conversions). 2443/// 2444/// In C++, where operators may be overloaded, a different kind of 2445/// expression node (CXXOperatorCallExpr) is used to express the 2446/// invocation of an overloaded operator with operator syntax. Within 2447/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2448/// used to store an expression "x + y" depends on the subexpressions 2449/// for x and y. If neither x or y is type-dependent, and the "+" 2450/// operator resolves to a built-in operation, BinaryOperator will be 2451/// used to express the computation (x and y may still be 2452/// value-dependent). If either x or y is type-dependent, or if the 2453/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2454/// be used to express the computation. 2455class BinaryOperator : public Expr { 2456public: 2457 typedef BinaryOperatorKind Opcode; 2458 2459private: 2460 unsigned Opc : 6; 2461 SourceLocation OpLoc; 2462 2463 enum { LHS, RHS, END_EXPR }; 2464 Stmt* SubExprs[END_EXPR]; 2465public: 2466 2467 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2468 ExprValueKind VK, ExprObjectKind OK, 2469 SourceLocation opLoc) 2470 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2471 lhs->isTypeDependent() || rhs->isTypeDependent(), 2472 lhs->isValueDependent() || rhs->isValueDependent(), 2473 (lhs->containsUnexpandedParameterPack() || 2474 rhs->containsUnexpandedParameterPack())), 2475 Opc(opc), OpLoc(opLoc) { 2476 SubExprs[LHS] = lhs; 2477 SubExprs[RHS] = rhs; 2478 assert(!isCompoundAssignmentOp() && 2479 "Use ArithAssignBinaryOperator for compound assignments"); 2480 } 2481 2482 /// \brief Construct an empty binary operator. 2483 explicit BinaryOperator(EmptyShell Empty) 2484 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2485 2486 SourceLocation getOperatorLoc() const { return OpLoc; } 2487 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2488 2489 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2490 void setOpcode(Opcode O) { Opc = O; } 2491 2492 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2493 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2494 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2495 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2496 2497 SourceRange getSourceRange() const { 2498 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2499 } 2500 2501 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2502 /// corresponds to, e.g. "<<=". 2503 static const char *getOpcodeStr(Opcode Op); 2504 2505 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2506 2507 /// \brief Retrieve the binary opcode that corresponds to the given 2508 /// overloaded operator. 2509 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2510 2511 /// \brief Retrieve the overloaded operator kind that corresponds to 2512 /// the given binary opcode. 2513 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2514 2515 /// predicates to categorize the respective opcodes. 2516 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2517 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2518 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2519 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2520 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2521 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2522 2523 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2524 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2525 2526 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2527 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2528 2529 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2530 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2531 2532 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2533 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2534 2535 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2536 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2537 2538 static bool isAssignmentOp(Opcode Opc) { 2539 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2540 } 2541 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2542 2543 static bool isCompoundAssignmentOp(Opcode Opc) { 2544 return Opc > BO_Assign && Opc <= BO_OrAssign; 2545 } 2546 bool isCompoundAssignmentOp() const { 2547 return isCompoundAssignmentOp(getOpcode()); 2548 } 2549 2550 static bool isShiftAssignOp(Opcode Opc) { 2551 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2552 } 2553 bool isShiftAssignOp() const { 2554 return isShiftAssignOp(getOpcode()); 2555 } 2556 2557 static bool classof(const Stmt *S) { 2558 return S->getStmtClass() >= firstBinaryOperatorConstant && 2559 S->getStmtClass() <= lastBinaryOperatorConstant; 2560 } 2561 static bool classof(const BinaryOperator *) { return true; } 2562 2563 // Iterators 2564 child_range children() { 2565 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2566 } 2567 2568protected: 2569 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2570 ExprValueKind VK, ExprObjectKind OK, 2571 SourceLocation opLoc, bool dead) 2572 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2573 lhs->isTypeDependent() || rhs->isTypeDependent(), 2574 lhs->isValueDependent() || rhs->isValueDependent(), 2575 (lhs->containsUnexpandedParameterPack() || 2576 rhs->containsUnexpandedParameterPack())), 2577 Opc(opc), OpLoc(opLoc) { 2578 SubExprs[LHS] = lhs; 2579 SubExprs[RHS] = rhs; 2580 } 2581 2582 BinaryOperator(StmtClass SC, EmptyShell Empty) 2583 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2584}; 2585 2586/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2587/// track of the type the operation is performed in. Due to the semantics of 2588/// these operators, the operands are promoted, the aritmetic performed, an 2589/// implicit conversion back to the result type done, then the assignment takes 2590/// place. This captures the intermediate type which the computation is done 2591/// in. 2592class CompoundAssignOperator : public BinaryOperator { 2593 QualType ComputationLHSType; 2594 QualType ComputationResultType; 2595public: 2596 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2597 ExprValueKind VK, ExprObjectKind OK, 2598 QualType CompLHSType, QualType CompResultType, 2599 SourceLocation OpLoc) 2600 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2601 ComputationLHSType(CompLHSType), 2602 ComputationResultType(CompResultType) { 2603 assert(isCompoundAssignmentOp() && 2604 "Only should be used for compound assignments"); 2605 } 2606 2607 /// \brief Build an empty compound assignment operator expression. 2608 explicit CompoundAssignOperator(EmptyShell Empty) 2609 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2610 2611 // The two computation types are the type the LHS is converted 2612 // to for the computation and the type of the result; the two are 2613 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2614 QualType getComputationLHSType() const { return ComputationLHSType; } 2615 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2616 2617 QualType getComputationResultType() const { return ComputationResultType; } 2618 void setComputationResultType(QualType T) { ComputationResultType = T; } 2619 2620 static bool classof(const CompoundAssignOperator *) { return true; } 2621 static bool classof(const Stmt *S) { 2622 return S->getStmtClass() == CompoundAssignOperatorClass; 2623 } 2624}; 2625 2626/// AbstractConditionalOperator - An abstract base class for 2627/// ConditionalOperator and BinaryConditionalOperator. 2628class AbstractConditionalOperator : public Expr { 2629 SourceLocation QuestionLoc, ColonLoc; 2630 friend class ASTStmtReader; 2631 2632protected: 2633 AbstractConditionalOperator(StmtClass SC, QualType T, 2634 ExprValueKind VK, ExprObjectKind OK, 2635 bool TD, bool VD, 2636 bool ContainsUnexpandedParameterPack, 2637 SourceLocation qloc, 2638 SourceLocation cloc) 2639 : Expr(SC, T, VK, OK, TD, VD, ContainsUnexpandedParameterPack), 2640 QuestionLoc(qloc), ColonLoc(cloc) {} 2641 2642 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2643 : Expr(SC, Empty) { } 2644 2645public: 2646 // getCond - Return the expression representing the condition for 2647 // the ?: operator. 2648 Expr *getCond() const; 2649 2650 // getTrueExpr - Return the subexpression representing the value of 2651 // the expression if the condition evaluates to true. 2652 Expr *getTrueExpr() const; 2653 2654 // getFalseExpr - Return the subexpression representing the value of 2655 // the expression if the condition evaluates to false. This is 2656 // the same as getRHS. 2657 Expr *getFalseExpr() const; 2658 2659 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2660 SourceLocation getColonLoc() const { return ColonLoc; } 2661 2662 static bool classof(const Stmt *T) { 2663 return T->getStmtClass() == ConditionalOperatorClass || 2664 T->getStmtClass() == BinaryConditionalOperatorClass; 2665 } 2666 static bool classof(const AbstractConditionalOperator *) { return true; } 2667}; 2668 2669/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2670/// middle" extension is a BinaryConditionalOperator. 2671class ConditionalOperator : public AbstractConditionalOperator { 2672 enum { COND, LHS, RHS, END_EXPR }; 2673 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2674 2675 friend class ASTStmtReader; 2676public: 2677 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2678 SourceLocation CLoc, Expr *rhs, 2679 QualType t, ExprValueKind VK, ExprObjectKind OK) 2680 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2681 // FIXME: the type of the conditional operator doesn't 2682 // depend on the type of the conditional, but the standard 2683 // seems to imply that it could. File a bug! 2684 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2685 (cond->isValueDependent() || lhs->isValueDependent() || 2686 rhs->isValueDependent()), 2687 (cond->containsUnexpandedParameterPack() || 2688 lhs->containsUnexpandedParameterPack() || 2689 rhs->containsUnexpandedParameterPack()), 2690 QLoc, CLoc) { 2691 SubExprs[COND] = cond; 2692 SubExprs[LHS] = lhs; 2693 SubExprs[RHS] = rhs; 2694 } 2695 2696 /// \brief Build an empty conditional operator. 2697 explicit ConditionalOperator(EmptyShell Empty) 2698 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2699 2700 // getCond - Return the expression representing the condition for 2701 // the ?: operator. 2702 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2703 2704 // getTrueExpr - Return the subexpression representing the value of 2705 // the expression if the condition evaluates to true. 2706 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2707 2708 // getFalseExpr - Return the subexpression representing the value of 2709 // the expression if the condition evaluates to false. This is 2710 // the same as getRHS. 2711 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2712 2713 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2714 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2715 2716 SourceRange getSourceRange() const { 2717 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2718 } 2719 static bool classof(const Stmt *T) { 2720 return T->getStmtClass() == ConditionalOperatorClass; 2721 } 2722 static bool classof(const ConditionalOperator *) { return true; } 2723 2724 // Iterators 2725 child_range children() { 2726 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2727 } 2728}; 2729 2730/// BinaryConditionalOperator - The GNU extension to the conditional 2731/// operator which allows the middle operand to be omitted. 2732/// 2733/// This is a different expression kind on the assumption that almost 2734/// every client ends up needing to know that these are different. 2735class BinaryConditionalOperator : public AbstractConditionalOperator { 2736 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2737 2738 /// - the common condition/left-hand-side expression, which will be 2739 /// evaluated as the opaque value 2740 /// - the condition, expressed in terms of the opaque value 2741 /// - the left-hand-side, expressed in terms of the opaque value 2742 /// - the right-hand-side 2743 Stmt *SubExprs[NUM_SUBEXPRS]; 2744 OpaqueValueExpr *OpaqueValue; 2745 2746 friend class ASTStmtReader; 2747public: 2748 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2749 Expr *cond, Expr *lhs, Expr *rhs, 2750 SourceLocation qloc, SourceLocation cloc, 2751 QualType t, ExprValueKind VK, ExprObjectKind OK) 2752 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2753 (common->isTypeDependent() || rhs->isTypeDependent()), 2754 (common->isValueDependent() || rhs->isValueDependent()), 2755 (common->containsUnexpandedParameterPack() || 2756 rhs->containsUnexpandedParameterPack()), 2757 qloc, cloc), 2758 OpaqueValue(opaqueValue) { 2759 SubExprs[COMMON] = common; 2760 SubExprs[COND] = cond; 2761 SubExprs[LHS] = lhs; 2762 SubExprs[RHS] = rhs; 2763 2764 OpaqueValue->setSourceExpr(common); 2765 } 2766 2767 /// \brief Build an empty conditional operator. 2768 explicit BinaryConditionalOperator(EmptyShell Empty) 2769 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2770 2771 /// \brief getCommon - Return the common expression, written to the 2772 /// left of the condition. The opaque value will be bound to the 2773 /// result of this expression. 2774 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2775 2776 /// \brief getOpaqueValue - Return the opaque value placeholder. 2777 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2778 2779 /// \brief getCond - Return the condition expression; this is defined 2780 /// in terms of the opaque value. 2781 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2782 2783 /// \brief getTrueExpr - Return the subexpression which will be 2784 /// evaluated if the condition evaluates to true; this is defined 2785 /// in terms of the opaque value. 2786 Expr *getTrueExpr() const { 2787 return cast<Expr>(SubExprs[LHS]); 2788 } 2789 2790 /// \brief getFalseExpr - Return the subexpression which will be 2791 /// evaluated if the condnition evaluates to false; this is 2792 /// defined in terms of the opaque value. 2793 Expr *getFalseExpr() const { 2794 return cast<Expr>(SubExprs[RHS]); 2795 } 2796 2797 SourceRange getSourceRange() const { 2798 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2799 } 2800 static bool classof(const Stmt *T) { 2801 return T->getStmtClass() == BinaryConditionalOperatorClass; 2802 } 2803 static bool classof(const BinaryConditionalOperator *) { return true; } 2804 2805 // Iterators 2806 child_range children() { 2807 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2808 } 2809}; 2810 2811inline Expr *AbstractConditionalOperator::getCond() const { 2812 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2813 return co->getCond(); 2814 return cast<BinaryConditionalOperator>(this)->getCond(); 2815} 2816 2817inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2818 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2819 return co->getTrueExpr(); 2820 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2821} 2822 2823inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2824 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2825 return co->getFalseExpr(); 2826 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2827} 2828 2829/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2830class AddrLabelExpr : public Expr { 2831 SourceLocation AmpAmpLoc, LabelLoc; 2832 LabelDecl *Label; 2833public: 2834 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2835 QualType t) 2836 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2837 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2838 2839 /// \brief Build an empty address of a label expression. 2840 explicit AddrLabelExpr(EmptyShell Empty) 2841 : Expr(AddrLabelExprClass, Empty) { } 2842 2843 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2844 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2845 SourceLocation getLabelLoc() const { return LabelLoc; } 2846 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2847 2848 SourceRange getSourceRange() const { 2849 return SourceRange(AmpAmpLoc, LabelLoc); 2850 } 2851 2852 LabelDecl *getLabel() const { return Label; } 2853 void setLabel(LabelDecl *L) { Label = L; } 2854 2855 static bool classof(const Stmt *T) { 2856 return T->getStmtClass() == AddrLabelExprClass; 2857 } 2858 static bool classof(const AddrLabelExpr *) { return true; } 2859 2860 // Iterators 2861 child_range children() { return child_range(); } 2862}; 2863 2864/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2865/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2866/// takes the value of the last subexpression. 2867/// 2868/// A StmtExpr is always an r-value; values "returned" out of a 2869/// StmtExpr will be copied. 2870class StmtExpr : public Expr { 2871 Stmt *SubStmt; 2872 SourceLocation LParenLoc, RParenLoc; 2873public: 2874 // FIXME: Does type-dependence need to be computed differently? 2875 StmtExpr(CompoundStmt *substmt, QualType T, 2876 SourceLocation lp, SourceLocation rp) : 2877 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2878 T->isDependentType(), false, false), 2879 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2880 2881 /// \brief Build an empty statement expression. 2882 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2883 2884 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2885 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2886 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2887 2888 SourceRange getSourceRange() const { 2889 return SourceRange(LParenLoc, RParenLoc); 2890 } 2891 2892 SourceLocation getLParenLoc() const { return LParenLoc; } 2893 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2894 SourceLocation getRParenLoc() const { return RParenLoc; } 2895 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2896 2897 static bool classof(const Stmt *T) { 2898 return T->getStmtClass() == StmtExprClass; 2899 } 2900 static bool classof(const StmtExpr *) { return true; } 2901 2902 // Iterators 2903 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2904}; 2905 2906 2907/// ShuffleVectorExpr - clang-specific builtin-in function 2908/// __builtin_shufflevector. 2909/// This AST node represents a operator that does a constant 2910/// shuffle, similar to LLVM's shufflevector instruction. It takes 2911/// two vectors and a variable number of constant indices, 2912/// and returns the appropriately shuffled vector. 2913class ShuffleVectorExpr : public Expr { 2914 SourceLocation BuiltinLoc, RParenLoc; 2915 2916 // SubExprs - the list of values passed to the __builtin_shufflevector 2917 // function. The first two are vectors, and the rest are constant 2918 // indices. The number of values in this list is always 2919 // 2+the number of indices in the vector type. 2920 Stmt **SubExprs; 2921 unsigned NumExprs; 2922 2923public: 2924 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2925 QualType Type, SourceLocation BLoc, 2926 SourceLocation RP); 2927 2928 /// \brief Build an empty vector-shuffle expression. 2929 explicit ShuffleVectorExpr(EmptyShell Empty) 2930 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2931 2932 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2933 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2934 2935 SourceLocation getRParenLoc() const { return RParenLoc; } 2936 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2937 2938 SourceRange getSourceRange() const { 2939 return SourceRange(BuiltinLoc, RParenLoc); 2940 } 2941 static bool classof(const Stmt *T) { 2942 return T->getStmtClass() == ShuffleVectorExprClass; 2943 } 2944 static bool classof(const ShuffleVectorExpr *) { return true; } 2945 2946 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2947 /// constant expression, the actual arguments passed in, and the function 2948 /// pointers. 2949 unsigned getNumSubExprs() const { return NumExprs; } 2950 2951 /// \brief Retrieve the array of expressions. 2952 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2953 2954 /// getExpr - Return the Expr at the specified index. 2955 Expr *getExpr(unsigned Index) { 2956 assert((Index < NumExprs) && "Arg access out of range!"); 2957 return cast<Expr>(SubExprs[Index]); 2958 } 2959 const Expr *getExpr(unsigned Index) const { 2960 assert((Index < NumExprs) && "Arg access out of range!"); 2961 return cast<Expr>(SubExprs[Index]); 2962 } 2963 2964 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2965 2966 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2967 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2968 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2969 } 2970 2971 // Iterators 2972 child_range children() { 2973 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 2974 } 2975}; 2976 2977/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2978/// This AST node is similar to the conditional operator (?:) in C, with 2979/// the following exceptions: 2980/// - the test expression must be a integer constant expression. 2981/// - the expression returned acts like the chosen subexpression in every 2982/// visible way: the type is the same as that of the chosen subexpression, 2983/// and all predicates (whether it's an l-value, whether it's an integer 2984/// constant expression, etc.) return the same result as for the chosen 2985/// sub-expression. 2986class ChooseExpr : public Expr { 2987 enum { COND, LHS, RHS, END_EXPR }; 2988 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2989 SourceLocation BuiltinLoc, RParenLoc; 2990public: 2991 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2992 QualType t, ExprValueKind VK, ExprObjectKind OK, 2993 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2994 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 2995 (cond->containsUnexpandedParameterPack() || 2996 lhs->containsUnexpandedParameterPack() || 2997 rhs->containsUnexpandedParameterPack())), 2998 BuiltinLoc(BLoc), RParenLoc(RP) { 2999 SubExprs[COND] = cond; 3000 SubExprs[LHS] = lhs; 3001 SubExprs[RHS] = rhs; 3002 } 3003 3004 /// \brief Build an empty __builtin_choose_expr. 3005 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3006 3007 /// isConditionTrue - Return whether the condition is true (i.e. not 3008 /// equal to zero). 3009 bool isConditionTrue(const ASTContext &C) const; 3010 3011 /// getChosenSubExpr - Return the subexpression chosen according to the 3012 /// condition. 3013 Expr *getChosenSubExpr(const ASTContext &C) const { 3014 return isConditionTrue(C) ? getLHS() : getRHS(); 3015 } 3016 3017 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3018 void setCond(Expr *E) { SubExprs[COND] = E; } 3019 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3020 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3021 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3022 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3023 3024 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3025 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3026 3027 SourceLocation getRParenLoc() const { return RParenLoc; } 3028 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3029 3030 SourceRange getSourceRange() const { 3031 return SourceRange(BuiltinLoc, RParenLoc); 3032 } 3033 static bool classof(const Stmt *T) { 3034 return T->getStmtClass() == ChooseExprClass; 3035 } 3036 static bool classof(const ChooseExpr *) { return true; } 3037 3038 // Iterators 3039 child_range children() { 3040 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3041 } 3042}; 3043 3044/// GNUNullExpr - Implements the GNU __null extension, which is a name 3045/// for a null pointer constant that has integral type (e.g., int or 3046/// long) and is the same size and alignment as a pointer. The __null 3047/// extension is typically only used by system headers, which define 3048/// NULL as __null in C++ rather than using 0 (which is an integer 3049/// that may not match the size of a pointer). 3050class GNUNullExpr : public Expr { 3051 /// TokenLoc - The location of the __null keyword. 3052 SourceLocation TokenLoc; 3053 3054public: 3055 GNUNullExpr(QualType Ty, SourceLocation Loc) 3056 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 3057 TokenLoc(Loc) { } 3058 3059 /// \brief Build an empty GNU __null expression. 3060 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3061 3062 /// getTokenLocation - The location of the __null token. 3063 SourceLocation getTokenLocation() const { return TokenLoc; } 3064 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3065 3066 SourceRange getSourceRange() const { 3067 return SourceRange(TokenLoc); 3068 } 3069 static bool classof(const Stmt *T) { 3070 return T->getStmtClass() == GNUNullExprClass; 3071 } 3072 static bool classof(const GNUNullExpr *) { return true; } 3073 3074 // Iterators 3075 child_range children() { return child_range(); } 3076}; 3077 3078/// VAArgExpr, used for the builtin function __builtin_va_arg. 3079class VAArgExpr : public Expr { 3080 Stmt *Val; 3081 TypeSourceInfo *TInfo; 3082 SourceLocation BuiltinLoc, RParenLoc; 3083public: 3084 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3085 SourceLocation RPLoc, QualType t) 3086 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3087 t->isDependentType(), false, 3088 (TInfo->getType()->containsUnexpandedParameterPack() || 3089 e->containsUnexpandedParameterPack())), 3090 Val(e), TInfo(TInfo), 3091 BuiltinLoc(BLoc), 3092 RParenLoc(RPLoc) { } 3093 3094 /// \brief Create an empty __builtin_va_arg expression. 3095 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3096 3097 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3098 Expr *getSubExpr() { return cast<Expr>(Val); } 3099 void setSubExpr(Expr *E) { Val = E; } 3100 3101 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3102 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3103 3104 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3105 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3106 3107 SourceLocation getRParenLoc() const { return RParenLoc; } 3108 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3109 3110 SourceRange getSourceRange() const { 3111 return SourceRange(BuiltinLoc, RParenLoc); 3112 } 3113 static bool classof(const Stmt *T) { 3114 return T->getStmtClass() == VAArgExprClass; 3115 } 3116 static bool classof(const VAArgExpr *) { return true; } 3117 3118 // Iterators 3119 child_range children() { return child_range(&Val, &Val+1); } 3120}; 3121 3122/// @brief Describes an C or C++ initializer list. 3123/// 3124/// InitListExpr describes an initializer list, which can be used to 3125/// initialize objects of different types, including 3126/// struct/class/union types, arrays, and vectors. For example: 3127/// 3128/// @code 3129/// struct foo x = { 1, { 2, 3 } }; 3130/// @endcode 3131/// 3132/// Prior to semantic analysis, an initializer list will represent the 3133/// initializer list as written by the user, but will have the 3134/// placeholder type "void". This initializer list is called the 3135/// syntactic form of the initializer, and may contain C99 designated 3136/// initializers (represented as DesignatedInitExprs), initializations 3137/// of subobject members without explicit braces, and so on. Clients 3138/// interested in the original syntax of the initializer list should 3139/// use the syntactic form of the initializer list. 3140/// 3141/// After semantic analysis, the initializer list will represent the 3142/// semantic form of the initializer, where the initializations of all 3143/// subobjects are made explicit with nested InitListExpr nodes and 3144/// C99 designators have been eliminated by placing the designated 3145/// initializations into the subobject they initialize. Additionally, 3146/// any "holes" in the initialization, where no initializer has been 3147/// specified for a particular subobject, will be replaced with 3148/// implicitly-generated ImplicitValueInitExpr expressions that 3149/// value-initialize the subobjects. Note, however, that the 3150/// initializer lists may still have fewer initializers than there are 3151/// elements to initialize within the object. 3152/// 3153/// Given the semantic form of the initializer list, one can retrieve 3154/// the original syntactic form of that initializer list (if it 3155/// exists) using getSyntacticForm(). Since many initializer lists 3156/// have the same syntactic and semantic forms, getSyntacticForm() may 3157/// return NULL, indicating that the current initializer list also 3158/// serves as its syntactic form. 3159class InitListExpr : public Expr { 3160 // FIXME: Eliminate this vector in favor of ASTContext allocation 3161 typedef ASTVector<Stmt *> InitExprsTy; 3162 InitExprsTy InitExprs; 3163 SourceLocation LBraceLoc, RBraceLoc; 3164 3165 /// Contains the initializer list that describes the syntactic form 3166 /// written in the source code. 3167 InitListExpr *SyntacticForm; 3168 3169 /// If this initializer list initializes a union, specifies which 3170 /// field within the union will be initialized. 3171 FieldDecl *UnionFieldInit; 3172 3173 /// Whether this initializer list originally had a GNU array-range 3174 /// designator in it. This is a temporary marker used by CodeGen. 3175 bool HadArrayRangeDesignator; 3176 3177public: 3178 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3179 Expr **initexprs, unsigned numinits, 3180 SourceLocation rbraceloc); 3181 3182 /// \brief Build an empty initializer list. 3183 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3184 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3185 3186 unsigned getNumInits() const { return InitExprs.size(); } 3187 3188 /// \brief Retrieve the set of initializers. 3189 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3190 3191 const Expr *getInit(unsigned Init) const { 3192 assert(Init < getNumInits() && "Initializer access out of range!"); 3193 return cast_or_null<Expr>(InitExprs[Init]); 3194 } 3195 3196 Expr *getInit(unsigned Init) { 3197 assert(Init < getNumInits() && "Initializer access out of range!"); 3198 return cast_or_null<Expr>(InitExprs[Init]); 3199 } 3200 3201 void setInit(unsigned Init, Expr *expr) { 3202 assert(Init < getNumInits() && "Initializer access out of range!"); 3203 InitExprs[Init] = expr; 3204 } 3205 3206 /// \brief Reserve space for some number of initializers. 3207 void reserveInits(ASTContext &C, unsigned NumInits); 3208 3209 /// @brief Specify the number of initializers 3210 /// 3211 /// If there are more than @p NumInits initializers, the remaining 3212 /// initializers will be destroyed. If there are fewer than @p 3213 /// NumInits initializers, NULL expressions will be added for the 3214 /// unknown initializers. 3215 void resizeInits(ASTContext &Context, unsigned NumInits); 3216 3217 /// @brief Updates the initializer at index @p Init with the new 3218 /// expression @p expr, and returns the old expression at that 3219 /// location. 3220 /// 3221 /// When @p Init is out of range for this initializer list, the 3222 /// initializer list will be extended with NULL expressions to 3223 /// accomodate the new entry. 3224 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3225 3226 /// \brief If this initializes a union, specifies which field in the 3227 /// union to initialize. 3228 /// 3229 /// Typically, this field is the first named field within the 3230 /// union. However, a designated initializer can specify the 3231 /// initialization of a different field within the union. 3232 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 3233 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 3234 3235 // Explicit InitListExpr's originate from source code (and have valid source 3236 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3237 bool isExplicit() { 3238 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3239 } 3240 3241 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3242 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3243 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3244 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3245 3246 /// @brief Retrieve the initializer list that describes the 3247 /// syntactic form of the initializer. 3248 /// 3249 /// 3250 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3251 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3252 3253 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3254 void sawArrayRangeDesignator(bool ARD = true) { 3255 HadArrayRangeDesignator = ARD; 3256 } 3257 3258 SourceRange getSourceRange() const; 3259 3260 static bool classof(const Stmt *T) { 3261 return T->getStmtClass() == InitListExprClass; 3262 } 3263 static bool classof(const InitListExpr *) { return true; } 3264 3265 // Iterators 3266 child_range children() { 3267 if (InitExprs.empty()) return child_range(); 3268 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3269 } 3270 3271 typedef InitExprsTy::iterator iterator; 3272 typedef InitExprsTy::const_iterator const_iterator; 3273 typedef InitExprsTy::reverse_iterator reverse_iterator; 3274 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3275 3276 iterator begin() { return InitExprs.begin(); } 3277 const_iterator begin() const { return InitExprs.begin(); } 3278 iterator end() { return InitExprs.end(); } 3279 const_iterator end() const { return InitExprs.end(); } 3280 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3281 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3282 reverse_iterator rend() { return InitExprs.rend(); } 3283 const_reverse_iterator rend() const { return InitExprs.rend(); } 3284}; 3285 3286/// @brief Represents a C99 designated initializer expression. 3287/// 3288/// A designated initializer expression (C99 6.7.8) contains one or 3289/// more designators (which can be field designators, array 3290/// designators, or GNU array-range designators) followed by an 3291/// expression that initializes the field or element(s) that the 3292/// designators refer to. For example, given: 3293/// 3294/// @code 3295/// struct point { 3296/// double x; 3297/// double y; 3298/// }; 3299/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3300/// @endcode 3301/// 3302/// The InitListExpr contains three DesignatedInitExprs, the first of 3303/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3304/// designators, one array designator for @c [2] followed by one field 3305/// designator for @c .y. The initalization expression will be 1.0. 3306class DesignatedInitExpr : public Expr { 3307public: 3308 /// \brief Forward declaration of the Designator class. 3309 class Designator; 3310 3311private: 3312 /// The location of the '=' or ':' prior to the actual initializer 3313 /// expression. 3314 SourceLocation EqualOrColonLoc; 3315 3316 /// Whether this designated initializer used the GNU deprecated 3317 /// syntax rather than the C99 '=' syntax. 3318 bool GNUSyntax : 1; 3319 3320 /// The number of designators in this initializer expression. 3321 unsigned NumDesignators : 15; 3322 3323 /// \brief The designators in this designated initialization 3324 /// expression. 3325 Designator *Designators; 3326 3327 /// The number of subexpressions of this initializer expression, 3328 /// which contains both the initializer and any additional 3329 /// expressions used by array and array-range designators. 3330 unsigned NumSubExprs : 16; 3331 3332 3333 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3334 const Designator *Designators, 3335 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3336 Expr **IndexExprs, unsigned NumIndexExprs, 3337 Expr *Init); 3338 3339 explicit DesignatedInitExpr(unsigned NumSubExprs) 3340 : Expr(DesignatedInitExprClass, EmptyShell()), 3341 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3342 3343public: 3344 /// A field designator, e.g., ".x". 3345 struct FieldDesignator { 3346 /// Refers to the field that is being initialized. The low bit 3347 /// of this field determines whether this is actually a pointer 3348 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3349 /// initially constructed, a field designator will store an 3350 /// IdentifierInfo*. After semantic analysis has resolved that 3351 /// name, the field designator will instead store a FieldDecl*. 3352 uintptr_t NameOrField; 3353 3354 /// The location of the '.' in the designated initializer. 3355 unsigned DotLoc; 3356 3357 /// The location of the field name in the designated initializer. 3358 unsigned FieldLoc; 3359 }; 3360 3361 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3362 struct ArrayOrRangeDesignator { 3363 /// Location of the first index expression within the designated 3364 /// initializer expression's list of subexpressions. 3365 unsigned Index; 3366 /// The location of the '[' starting the array range designator. 3367 unsigned LBracketLoc; 3368 /// The location of the ellipsis separating the start and end 3369 /// indices. Only valid for GNU array-range designators. 3370 unsigned EllipsisLoc; 3371 /// The location of the ']' terminating the array range designator. 3372 unsigned RBracketLoc; 3373 }; 3374 3375 /// @brief Represents a single C99 designator. 3376 /// 3377 /// @todo This class is infuriatingly similar to clang::Designator, 3378 /// but minor differences (storing indices vs. storing pointers) 3379 /// keep us from reusing it. Try harder, later, to rectify these 3380 /// differences. 3381 class Designator { 3382 /// @brief The kind of designator this describes. 3383 enum { 3384 FieldDesignator, 3385 ArrayDesignator, 3386 ArrayRangeDesignator 3387 } Kind; 3388 3389 union { 3390 /// A field designator, e.g., ".x". 3391 struct FieldDesignator Field; 3392 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3393 struct ArrayOrRangeDesignator ArrayOrRange; 3394 }; 3395 friend class DesignatedInitExpr; 3396 3397 public: 3398 Designator() {} 3399 3400 /// @brief Initializes a field designator. 3401 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3402 SourceLocation FieldLoc) 3403 : Kind(FieldDesignator) { 3404 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3405 Field.DotLoc = DotLoc.getRawEncoding(); 3406 Field.FieldLoc = FieldLoc.getRawEncoding(); 3407 } 3408 3409 /// @brief Initializes an array designator. 3410 Designator(unsigned Index, SourceLocation LBracketLoc, 3411 SourceLocation RBracketLoc) 3412 : Kind(ArrayDesignator) { 3413 ArrayOrRange.Index = Index; 3414 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3415 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3416 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3417 } 3418 3419 /// @brief Initializes a GNU array-range designator. 3420 Designator(unsigned Index, SourceLocation LBracketLoc, 3421 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3422 : Kind(ArrayRangeDesignator) { 3423 ArrayOrRange.Index = Index; 3424 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3425 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3426 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3427 } 3428 3429 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3430 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3431 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3432 3433 IdentifierInfo * getFieldName(); 3434 3435 FieldDecl *getField() { 3436 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3437 if (Field.NameOrField & 0x01) 3438 return 0; 3439 else 3440 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3441 } 3442 3443 void setField(FieldDecl *FD) { 3444 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3445 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3446 } 3447 3448 SourceLocation getDotLoc() const { 3449 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3450 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3451 } 3452 3453 SourceLocation getFieldLoc() const { 3454 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3455 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3456 } 3457 3458 SourceLocation getLBracketLoc() const { 3459 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3460 "Only valid on an array or array-range designator"); 3461 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3462 } 3463 3464 SourceLocation getRBracketLoc() const { 3465 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3466 "Only valid on an array or array-range designator"); 3467 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3468 } 3469 3470 SourceLocation getEllipsisLoc() const { 3471 assert(Kind == ArrayRangeDesignator && 3472 "Only valid on an array-range designator"); 3473 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3474 } 3475 3476 unsigned getFirstExprIndex() const { 3477 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3478 "Only valid on an array or array-range designator"); 3479 return ArrayOrRange.Index; 3480 } 3481 3482 SourceLocation getStartLocation() const { 3483 if (Kind == FieldDesignator) 3484 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3485 else 3486 return getLBracketLoc(); 3487 } 3488 }; 3489 3490 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3491 unsigned NumDesignators, 3492 Expr **IndexExprs, unsigned NumIndexExprs, 3493 SourceLocation EqualOrColonLoc, 3494 bool GNUSyntax, Expr *Init); 3495 3496 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3497 3498 /// @brief Returns the number of designators in this initializer. 3499 unsigned size() const { return NumDesignators; } 3500 3501 // Iterator access to the designators. 3502 typedef Designator* designators_iterator; 3503 designators_iterator designators_begin() { return Designators; } 3504 designators_iterator designators_end() { 3505 return Designators + NumDesignators; 3506 } 3507 3508 typedef std::reverse_iterator<designators_iterator> 3509 reverse_designators_iterator; 3510 reverse_designators_iterator designators_rbegin() { 3511 return reverse_designators_iterator(designators_end()); 3512 } 3513 reverse_designators_iterator designators_rend() { 3514 return reverse_designators_iterator(designators_begin()); 3515 } 3516 3517 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3518 3519 void setDesignators(ASTContext &C, const Designator *Desigs, 3520 unsigned NumDesigs); 3521 3522 Expr *getArrayIndex(const Designator& D); 3523 Expr *getArrayRangeStart(const Designator& D); 3524 Expr *getArrayRangeEnd(const Designator& D); 3525 3526 /// @brief Retrieve the location of the '=' that precedes the 3527 /// initializer value itself, if present. 3528 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3529 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3530 3531 /// @brief Determines whether this designated initializer used the 3532 /// deprecated GNU syntax for designated initializers. 3533 bool usesGNUSyntax() const { return GNUSyntax; } 3534 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3535 3536 /// @brief Retrieve the initializer value. 3537 Expr *getInit() const { 3538 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3539 } 3540 3541 void setInit(Expr *init) { 3542 *child_begin() = init; 3543 } 3544 3545 /// \brief Retrieve the total number of subexpressions in this 3546 /// designated initializer expression, including the actual 3547 /// initialized value and any expressions that occur within array 3548 /// and array-range designators. 3549 unsigned getNumSubExprs() const { return NumSubExprs; } 3550 3551 Expr *getSubExpr(unsigned Idx) { 3552 assert(Idx < NumSubExprs && "Subscript out of range"); 3553 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3554 Ptr += sizeof(DesignatedInitExpr); 3555 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3556 } 3557 3558 void setSubExpr(unsigned Idx, Expr *E) { 3559 assert(Idx < NumSubExprs && "Subscript out of range"); 3560 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3561 Ptr += sizeof(DesignatedInitExpr); 3562 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3563 } 3564 3565 /// \brief Replaces the designator at index @p Idx with the series 3566 /// of designators in [First, Last). 3567 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3568 const Designator *Last); 3569 3570 SourceRange getSourceRange() const; 3571 3572 static bool classof(const Stmt *T) { 3573 return T->getStmtClass() == DesignatedInitExprClass; 3574 } 3575 static bool classof(const DesignatedInitExpr *) { return true; } 3576 3577 // Iterators 3578 child_range children() { 3579 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3580 return child_range(begin, begin + NumSubExprs); 3581 } 3582}; 3583 3584/// \brief Represents an implicitly-generated value initialization of 3585/// an object of a given type. 3586/// 3587/// Implicit value initializations occur within semantic initializer 3588/// list expressions (InitListExpr) as placeholders for subobject 3589/// initializations not explicitly specified by the user. 3590/// 3591/// \see InitListExpr 3592class ImplicitValueInitExpr : public Expr { 3593public: 3594 explicit ImplicitValueInitExpr(QualType ty) 3595 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3596 false, false, false) { } 3597 3598 /// \brief Construct an empty implicit value initialization. 3599 explicit ImplicitValueInitExpr(EmptyShell Empty) 3600 : Expr(ImplicitValueInitExprClass, Empty) { } 3601 3602 static bool classof(const Stmt *T) { 3603 return T->getStmtClass() == ImplicitValueInitExprClass; 3604 } 3605 static bool classof(const ImplicitValueInitExpr *) { return true; } 3606 3607 SourceRange getSourceRange() const { 3608 return SourceRange(); 3609 } 3610 3611 // Iterators 3612 child_range children() { return child_range(); } 3613}; 3614 3615 3616class ParenListExpr : public Expr { 3617 Stmt **Exprs; 3618 unsigned NumExprs; 3619 SourceLocation LParenLoc, RParenLoc; 3620 3621public: 3622 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3623 unsigned numexprs, SourceLocation rparenloc); 3624 3625 /// \brief Build an empty paren list. 3626 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3627 3628 unsigned getNumExprs() const { return NumExprs; } 3629 3630 const Expr* getExpr(unsigned Init) const { 3631 assert(Init < getNumExprs() && "Initializer access out of range!"); 3632 return cast_or_null<Expr>(Exprs[Init]); 3633 } 3634 3635 Expr* getExpr(unsigned Init) { 3636 assert(Init < getNumExprs() && "Initializer access out of range!"); 3637 return cast_or_null<Expr>(Exprs[Init]); 3638 } 3639 3640 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3641 3642 SourceLocation getLParenLoc() const { return LParenLoc; } 3643 SourceLocation getRParenLoc() const { return RParenLoc; } 3644 3645 SourceRange getSourceRange() const { 3646 return SourceRange(LParenLoc, RParenLoc); 3647 } 3648 static bool classof(const Stmt *T) { 3649 return T->getStmtClass() == ParenListExprClass; 3650 } 3651 static bool classof(const ParenListExpr *) { return true; } 3652 3653 // Iterators 3654 child_range children() { 3655 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3656 } 3657 3658 friend class ASTStmtReader; 3659 friend class ASTStmtWriter; 3660}; 3661 3662 3663//===----------------------------------------------------------------------===// 3664// Clang Extensions 3665//===----------------------------------------------------------------------===// 3666 3667 3668/// ExtVectorElementExpr - This represents access to specific elements of a 3669/// vector, and may occur on the left hand side or right hand side. For example 3670/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3671/// 3672/// Note that the base may have either vector or pointer to vector type, just 3673/// like a struct field reference. 3674/// 3675class ExtVectorElementExpr : public Expr { 3676 Stmt *Base; 3677 IdentifierInfo *Accessor; 3678 SourceLocation AccessorLoc; 3679public: 3680 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3681 IdentifierInfo &accessor, SourceLocation loc) 3682 : Expr(ExtVectorElementExprClass, ty, VK, 3683 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3684 base->isTypeDependent(), base->isValueDependent(), 3685 base->containsUnexpandedParameterPack()), 3686 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3687 3688 /// \brief Build an empty vector element expression. 3689 explicit ExtVectorElementExpr(EmptyShell Empty) 3690 : Expr(ExtVectorElementExprClass, Empty) { } 3691 3692 const Expr *getBase() const { return cast<Expr>(Base); } 3693 Expr *getBase() { return cast<Expr>(Base); } 3694 void setBase(Expr *E) { Base = E; } 3695 3696 IdentifierInfo &getAccessor() const { return *Accessor; } 3697 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3698 3699 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3700 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3701 3702 /// getNumElements - Get the number of components being selected. 3703 unsigned getNumElements() const; 3704 3705 /// containsDuplicateElements - Return true if any element access is 3706 /// repeated. 3707 bool containsDuplicateElements() const; 3708 3709 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3710 /// aggregate Constant of ConstantInt(s). 3711 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3712 3713 SourceRange getSourceRange() const { 3714 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3715 } 3716 3717 /// isArrow - Return true if the base expression is a pointer to vector, 3718 /// return false if the base expression is a vector. 3719 bool isArrow() const; 3720 3721 static bool classof(const Stmt *T) { 3722 return T->getStmtClass() == ExtVectorElementExprClass; 3723 } 3724 static bool classof(const ExtVectorElementExpr *) { return true; } 3725 3726 // Iterators 3727 child_range children() { return child_range(&Base, &Base+1); } 3728}; 3729 3730 3731/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3732/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3733class BlockExpr : public Expr { 3734protected: 3735 BlockDecl *TheBlock; 3736public: 3737 BlockExpr(BlockDecl *BD, QualType ty) 3738 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3739 ty->isDependentType(), false, false), 3740 TheBlock(BD) {} 3741 3742 /// \brief Build an empty block expression. 3743 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3744 3745 const BlockDecl *getBlockDecl() const { return TheBlock; } 3746 BlockDecl *getBlockDecl() { return TheBlock; } 3747 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3748 3749 // Convenience functions for probing the underlying BlockDecl. 3750 SourceLocation getCaretLocation() const; 3751 const Stmt *getBody() const; 3752 Stmt *getBody(); 3753 3754 SourceRange getSourceRange() const { 3755 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3756 } 3757 3758 /// getFunctionType - Return the underlying function type for this block. 3759 const FunctionType *getFunctionType() const; 3760 3761 static bool classof(const Stmt *T) { 3762 return T->getStmtClass() == BlockExprClass; 3763 } 3764 static bool classof(const BlockExpr *) { return true; } 3765 3766 // Iterators 3767 child_range children() { return child_range(); } 3768}; 3769 3770/// BlockDeclRefExpr - A reference to a local variable declared in an 3771/// enclosing scope. 3772class BlockDeclRefExpr : public Expr { 3773 VarDecl *D; 3774 SourceLocation Loc; 3775 bool IsByRef : 1; 3776 bool ConstQualAdded : 1; 3777public: 3778 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3779 SourceLocation l, bool ByRef, bool constAdded = false); 3780 3781 // \brief Build an empty reference to a declared variable in a 3782 // block. 3783 explicit BlockDeclRefExpr(EmptyShell Empty) 3784 : Expr(BlockDeclRefExprClass, Empty) { } 3785 3786 VarDecl *getDecl() { return D; } 3787 const VarDecl *getDecl() const { return D; } 3788 void setDecl(VarDecl *VD) { D = VD; } 3789 3790 SourceLocation getLocation() const { return Loc; } 3791 void setLocation(SourceLocation L) { Loc = L; } 3792 3793 SourceRange getSourceRange() const { return SourceRange(Loc); } 3794 3795 bool isByRef() const { return IsByRef; } 3796 void setByRef(bool BR) { IsByRef = BR; } 3797 3798 bool isConstQualAdded() const { return ConstQualAdded; } 3799 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3800 3801 static bool classof(const Stmt *T) { 3802 return T->getStmtClass() == BlockDeclRefExprClass; 3803 } 3804 static bool classof(const BlockDeclRefExpr *) { return true; } 3805 3806 // Iterators 3807 child_range children() { return child_range(); } 3808}; 3809 3810} // end namespace clang 3811 3812#endif 3813