Expr.h revision 2de56d1d0c3a504ad1529de2677628bdfbb95cd4
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/UsuallyTinyPtrVector.h" 24#include "llvm/ADT/APSInt.h" 25#include "llvm/ADT/APFloat.h" 26#include "llvm/ADT/SmallVector.h" 27#include "llvm/ADT/StringRef.h" 28#include <vector> 29 30namespace clang { 31 class ASTContext; 32 class APValue; 33 class Decl; 34 class IdentifierInfo; 35 class ParmVarDecl; 36 class NamedDecl; 37 class ValueDecl; 38 class BlockDecl; 39 class CXXBaseSpecifier; 40 class CXXOperatorCallExpr; 41 class CXXMemberCallExpr; 42 class TemplateArgumentLoc; 43 class TemplateArgumentListInfo; 44 45/// \brief A simple array of base specifiers. 46typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 47 48/// Expr - This represents one expression. Note that Expr's are subclasses of 49/// Stmt. This allows an expression to be transparently used any place a Stmt 50/// is required. 51/// 52class Expr : public Stmt { 53 QualType TR; 54 55 virtual void ANCHOR(); // key function. 56protected: 57 /// TypeDependent - Whether this expression is type-dependent 58 /// (C++ [temp.dep.expr]). 59 bool TypeDependent : 1; 60 61 /// ValueDependent - Whether this expression is value-dependent 62 /// (C++ [temp.dep.constexpr]). 63 bool ValueDependent : 1; 64 65 /// ValueKind - The value classification of this expression. 66 /// Only actually used by certain subclasses. 67 unsigned ValueKind : 2; 68 69 enum { BitsRemaining = 28 }; 70 71 Expr(StmtClass SC, QualType T, bool TD, bool VD) 72 : Stmt(SC), TypeDependent(TD), ValueDependent(VD), ValueKind(0) { 73 setType(T); 74 } 75 76 /// \brief Construct an empty expression. 77 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 78 79public: 80 /// \brief Increases the reference count for this expression. 81 /// 82 /// Invoke the Retain() operation when this expression 83 /// is being shared by another owner. 84 Expr *Retain() { 85 Stmt::Retain(); 86 return this; 87 } 88 89 QualType getType() const { return TR; } 90 void setType(QualType t) { 91 // In C++, the type of an expression is always adjusted so that it 92 // will not have reference type an expression will never have 93 // reference type (C++ [expr]p6). Use 94 // QualType::getNonReferenceType() to retrieve the non-reference 95 // type. Additionally, inspect Expr::isLvalue to determine whether 96 // an expression that is adjusted in this manner should be 97 // considered an lvalue. 98 assert((t.isNull() || !t->isReferenceType()) && 99 "Expressions can't have reference type"); 100 101 TR = t; 102 } 103 104 /// isValueDependent - Determines whether this expression is 105 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 106 /// array bound of "Chars" in the following example is 107 /// value-dependent. 108 /// @code 109 /// template<int Size, char (&Chars)[Size]> struct meta_string; 110 /// @endcode 111 bool isValueDependent() const { return ValueDependent; } 112 113 /// \brief Set whether this expression is value-dependent or not. 114 void setValueDependent(bool VD) { ValueDependent = VD; } 115 116 /// isTypeDependent - Determines whether this expression is 117 /// type-dependent (C++ [temp.dep.expr]), which means that its type 118 /// could change from one template instantiation to the next. For 119 /// example, the expressions "x" and "x + y" are type-dependent in 120 /// the following code, but "y" is not type-dependent: 121 /// @code 122 /// template<typename T> 123 /// void add(T x, int y) { 124 /// x + y; 125 /// } 126 /// @endcode 127 bool isTypeDependent() const { return TypeDependent; } 128 129 /// \brief Set whether this expression is type-dependent or not. 130 void setTypeDependent(bool TD) { TypeDependent = TD; } 131 132 /// SourceLocation tokens are not useful in isolation - they are low level 133 /// value objects created/interpreted by SourceManager. We assume AST 134 /// clients will have a pointer to the respective SourceManager. 135 virtual SourceRange getSourceRange() const = 0; 136 137 /// getExprLoc - Return the preferred location for the arrow when diagnosing 138 /// a problem with a generic expression. 139 virtual SourceLocation getExprLoc() const { return getLocStart(); } 140 141 /// isUnusedResultAWarning - Return true if this immediate expression should 142 /// be warned about if the result is unused. If so, fill in Loc and Ranges 143 /// with location to warn on and the source range[s] to report with the 144 /// warning. 145 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 146 SourceRange &R2, ASTContext &Ctx) const; 147 148 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 149 /// incomplete type other than void. Nonarray expressions that can be lvalues: 150 /// - name, where name must be a variable 151 /// - e[i] 152 /// - (e), where e must be an lvalue 153 /// - e.name, where e must be an lvalue 154 /// - e->name 155 /// - *e, the type of e cannot be a function type 156 /// - string-constant 157 /// - reference type [C++ [expr]] 158 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 159 /// 160 enum isLvalueResult { 161 LV_Valid, 162 LV_NotObjectType, 163 LV_IncompleteVoidType, 164 LV_DuplicateVectorComponents, 165 LV_InvalidExpression, 166 LV_MemberFunction, 167 LV_SubObjCPropertySetting, 168 LV_ClassTemporary 169 }; 170 isLvalueResult isLvalue(ASTContext &Ctx) const; 171 172 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 173 /// does not have an incomplete type, does not have a const-qualified type, 174 /// and if it is a structure or union, does not have any member (including, 175 /// recursively, any member or element of all contained aggregates or unions) 176 /// with a const-qualified type. 177 /// 178 /// \param Loc [in] [out] - A source location which *may* be filled 179 /// in with the location of the expression making this a 180 /// non-modifiable lvalue, if specified. 181 enum isModifiableLvalueResult { 182 MLV_Valid, 183 MLV_NotObjectType, 184 MLV_IncompleteVoidType, 185 MLV_DuplicateVectorComponents, 186 MLV_InvalidExpression, 187 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 188 MLV_IncompleteType, 189 MLV_ConstQualified, 190 MLV_ArrayType, 191 MLV_NotBlockQualified, 192 MLV_ReadonlyProperty, 193 MLV_NoSetterProperty, 194 MLV_MemberFunction, 195 MLV_SubObjCPropertySetting, 196 MLV_ClassTemporary 197 }; 198 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 199 SourceLocation *Loc = 0) const; 200 201 /// \brief The return type of classify(). Represents the C++0x expression 202 /// taxonomy. 203 class Classification { 204 public: 205 /// \brief The various classification results. Most of these mean prvalue. 206 enum Kinds { 207 CL_LValue, 208 CL_XValue, 209 CL_Function, // Functions cannot be lvalues in C. 210 CL_Void, // Void cannot be an lvalue in C. 211 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 212 CL_MemberFunction, // An expression referring to a member function 213 CL_SubObjCPropertySetting, 214 CL_ClassTemporary, // A prvalue of class type 215 CL_PRValue // A prvalue for any other reason, of any other type 216 }; 217 /// \brief The results of modification testing. 218 enum ModifiableType { 219 CM_Untested, // testModifiable was false. 220 CM_Modifiable, 221 CM_RValue, // Not modifiable because it's an rvalue 222 CM_Function, // Not modifiable because it's a function; C++ only 223 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 224 CM_NotBlockQualified, // Not captured in the closure 225 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 226 CM_ConstQualified, 227 CM_ArrayType, 228 CM_IncompleteType 229 }; 230 231 private: 232 friend class Expr; 233 234 unsigned short Kind; 235 unsigned short Modifiable; 236 237 explicit Classification(Kinds k, ModifiableType m) 238 : Kind(k), Modifiable(m) 239 {} 240 241 public: 242 Classification() {} 243 244 Kinds getKind() const { return static_cast<Kinds>(Kind); } 245 ModifiableType getModifiable() const { 246 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 247 return static_cast<ModifiableType>(Modifiable); 248 } 249 bool isLValue() const { return Kind == CL_LValue; } 250 bool isXValue() const { return Kind == CL_XValue; } 251 bool isGLValue() const { return Kind <= CL_XValue; } 252 bool isPRValue() const { return Kind >= CL_Function; } 253 bool isRValue() const { return Kind >= CL_XValue; } 254 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 255 }; 256 /// \brief classify - Classify this expression according to the C++0x 257 /// expression taxonomy. 258 /// 259 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 260 /// old lvalue vs rvalue. This function determines the type of expression this 261 /// is. There are three expression types: 262 /// - lvalues are classical lvalues as in C++03. 263 /// - prvalues are equivalent to rvalues in C++03. 264 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 265 /// function returning an rvalue reference. 266 /// lvalues and xvalues are collectively referred to as glvalues, while 267 /// prvalues and xvalues together form rvalues. 268 Classification Classify(ASTContext &Ctx) const { 269 return ClassifyImpl(Ctx, 0); 270 } 271 272 /// \brief classifyModifiable - Classify this expression according to the 273 /// C++0x expression taxonomy, and see if it is valid on the left side 274 /// of an assignment. 275 /// 276 /// This function extends classify in that it also tests whether the 277 /// expression is modifiable (C99 6.3.2.1p1). 278 /// \param Loc A source location that might be filled with a relevant location 279 /// if the expression is not modifiable. 280 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 281 return ClassifyImpl(Ctx, &Loc); 282 } 283 284private: 285 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 286 287public: 288 289 /// \brief If this expression refers to a bit-field, retrieve the 290 /// declaration of that bit-field. 291 FieldDecl *getBitField(); 292 293 const FieldDecl *getBitField() const { 294 return const_cast<Expr*>(this)->getBitField(); 295 } 296 297 /// \brief Returns whether this expression refers to a vector element. 298 bool refersToVectorElement() const; 299 300 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 301 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 302 /// but also int expressions which are produced by things like comparisons in 303 /// C. 304 bool isKnownToHaveBooleanValue() const; 305 306 /// isIntegerConstantExpr - Return true if this expression is a valid integer 307 /// constant expression, and, if so, return its value in Result. If not a 308 /// valid i-c-e, return false and fill in Loc (if specified) with the location 309 /// of the invalid expression. 310 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 311 SourceLocation *Loc = 0, 312 bool isEvaluated = true) const; 313 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 314 llvm::APSInt X; 315 return isIntegerConstantExpr(X, Ctx, Loc); 316 } 317 /// isConstantInitializer - Returns true if this expression is a constant 318 /// initializer, which can be emitted at compile-time. 319 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 320 321 /// EvalResult is a struct with detailed info about an evaluated expression. 322 struct EvalResult { 323 /// Val - This is the value the expression can be folded to. 324 APValue Val; 325 326 /// HasSideEffects - Whether the evaluated expression has side effects. 327 /// For example, (f() && 0) can be folded, but it still has side effects. 328 bool HasSideEffects; 329 330 /// Diag - If the expression is unfoldable, then Diag contains a note 331 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 332 /// position for the error, and DiagExpr is the expression that caused 333 /// the error. 334 /// If the expression is foldable, but not an integer constant expression, 335 /// Diag contains a note diagnostic that describes why it isn't an integer 336 /// constant expression. If the expression *is* an integer constant 337 /// expression, then Diag will be zero. 338 unsigned Diag; 339 const Expr *DiagExpr; 340 SourceLocation DiagLoc; 341 342 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 343 344 // isGlobalLValue - Return true if the evaluated lvalue expression 345 // is global. 346 bool isGlobalLValue() const; 347 // hasSideEffects - Return true if the evaluated expression has 348 // side effects. 349 bool hasSideEffects() const { 350 return HasSideEffects; 351 } 352 }; 353 354 /// Evaluate - Return true if this is a constant which we can fold using 355 /// any crazy technique (that has nothing to do with language standards) that 356 /// we want to. If this function returns true, it returns the folded constant 357 /// in Result. 358 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 359 360 /// EvaluateAsBooleanCondition - Return true if this is a constant 361 /// which we we can fold and convert to a boolean condition using 362 /// any crazy technique that we want to. 363 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 364 365 /// isEvaluatable - Call Evaluate to see if this expression can be constant 366 /// folded, but discard the result. 367 bool isEvaluatable(ASTContext &Ctx) const; 368 369 /// HasSideEffects - This routine returns true for all those expressions 370 /// which must be evaluated each time and must not be optimization away 371 /// or evaluated at compile time. Example is a function call, volatile 372 /// variable read. 373 bool HasSideEffects(ASTContext &Ctx) const; 374 375 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 376 /// must be called on an expression that constant folds to an integer. 377 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 378 379 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 380 /// with link time known address. 381 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 382 383 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 384 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 385 386 /// \brief Enumeration used to describe how \c isNullPointerConstant() 387 /// should cope with value-dependent expressions. 388 enum NullPointerConstantValueDependence { 389 /// \brief Specifies that the expression should never be value-dependent. 390 NPC_NeverValueDependent = 0, 391 392 /// \brief Specifies that a value-dependent expression of integral or 393 /// dependent type should be considered a null pointer constant. 394 NPC_ValueDependentIsNull, 395 396 /// \brief Specifies that a value-dependent expression should be considered 397 /// to never be a null pointer constant. 398 NPC_ValueDependentIsNotNull 399 }; 400 401 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 402 /// integer constant expression with the value zero, or if this is one that is 403 /// cast to void*. 404 bool isNullPointerConstant(ASTContext &Ctx, 405 NullPointerConstantValueDependence NPC) const; 406 407 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 408 /// write barrier. 409 bool isOBJCGCCandidate(ASTContext &Ctx) const; 410 411 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 412 /// its subexpression. If that subexpression is also a ParenExpr, 413 /// then this method recursively returns its subexpression, and so forth. 414 /// Otherwise, the method returns the current Expr. 415 Expr *IgnoreParens(); 416 417 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 418 /// or CastExprs, returning their operand. 419 Expr *IgnoreParenCasts(); 420 421 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 422 /// ParenExpr or ImplicitCastExprs, returning their operand. 423 Expr *IgnoreParenImpCasts(); 424 425 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 426 /// value (including ptr->int casts of the same size). Strip off any 427 /// ParenExpr or CastExprs, returning their operand. 428 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 429 430 /// \brief Determine whether this expression is a default function argument. 431 /// 432 /// Default arguments are implicitly generated in the abstract syntax tree 433 /// by semantic analysis for function calls, object constructions, etc. in 434 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 435 /// this routine also looks through any implicit casts to determine whether 436 /// the expression is a default argument. 437 bool isDefaultArgument() const; 438 439 /// \brief Determine whether this expression directly creates a 440 /// temporary object (of class type). 441 bool isTemporaryObject() const { return getTemporaryObject() != 0; } 442 443 /// \brief If this expression directly creates a temporary object of 444 /// class type, return the expression that actually constructs that 445 /// temporary object. 446 const Expr *getTemporaryObject() const; 447 448 const Expr *IgnoreParens() const { 449 return const_cast<Expr*>(this)->IgnoreParens(); 450 } 451 const Expr *IgnoreParenCasts() const { 452 return const_cast<Expr*>(this)->IgnoreParenCasts(); 453 } 454 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 455 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 456 } 457 458 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 459 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 460 461 static bool classof(const Stmt *T) { 462 return T->getStmtClass() >= firstExprConstant && 463 T->getStmtClass() <= lastExprConstant; 464 } 465 static bool classof(const Expr *) { return true; } 466}; 467 468 469//===----------------------------------------------------------------------===// 470// Primary Expressions. 471//===----------------------------------------------------------------------===// 472 473/// \brief Represents the qualifier that may precede a C++ name, e.g., the 474/// "std::" in "std::sort". 475struct NameQualifier { 476 /// \brief The nested name specifier. 477 NestedNameSpecifier *NNS; 478 479 /// \brief The source range covered by the nested name specifier. 480 SourceRange Range; 481}; 482 483/// \brief Represents an explicit template argument list in C++, e.g., 484/// the "<int>" in "sort<int>". 485struct ExplicitTemplateArgumentList { 486 /// \brief The source location of the left angle bracket ('<'); 487 SourceLocation LAngleLoc; 488 489 /// \brief The source location of the right angle bracket ('>'); 490 SourceLocation RAngleLoc; 491 492 /// \brief The number of template arguments in TemplateArgs. 493 /// The actual template arguments (if any) are stored after the 494 /// ExplicitTemplateArgumentList structure. 495 unsigned NumTemplateArgs; 496 497 /// \brief Retrieve the template arguments 498 TemplateArgumentLoc *getTemplateArgs() { 499 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 500 } 501 502 /// \brief Retrieve the template arguments 503 const TemplateArgumentLoc *getTemplateArgs() const { 504 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 505 } 506 507 void initializeFrom(const TemplateArgumentListInfo &List); 508 void copyInto(TemplateArgumentListInfo &List) const; 509 static std::size_t sizeFor(unsigned NumTemplateArgs); 510 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 511}; 512 513/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 514/// enum, etc. 515class DeclRefExpr : public Expr { 516 enum { 517 // Flag on DecoratedD that specifies when this declaration reference 518 // expression has a C++ nested-name-specifier. 519 HasQualifierFlag = 0x01, 520 // Flag on DecoratedD that specifies when this declaration reference 521 // expression has an explicit C++ template argument list. 522 HasExplicitTemplateArgumentListFlag = 0x02 523 }; 524 525 // DecoratedD - The declaration that we are referencing, plus two bits to 526 // indicate whether (1) the declaration's name was explicitly qualified and 527 // (2) the declaration's name was followed by an explicit template 528 // argument list. 529 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 530 531 // Loc - The location of the declaration name itself. 532 SourceLocation Loc; 533 534 /// DNLoc - Provides source/type location info for the 535 /// declaration name embedded in DecoratedD. 536 DeclarationNameLoc DNLoc; 537 538 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 539 NameQualifier *getNameQualifier() { 540 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 541 return 0; 542 543 return reinterpret_cast<NameQualifier *> (this + 1); 544 } 545 546 /// \brief Retrieve the qualifier that preceded the member name, if any. 547 const NameQualifier *getNameQualifier() const { 548 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 549 } 550 551 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 552 ValueDecl *D, SourceLocation NameLoc, 553 const TemplateArgumentListInfo *TemplateArgs, 554 QualType T); 555 556 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 557 ValueDecl *D, const DeclarationNameInfo &NameInfo, 558 const TemplateArgumentListInfo *TemplateArgs, 559 QualType T); 560 561 /// \brief Construct an empty declaration reference expression. 562 explicit DeclRefExpr(EmptyShell Empty) 563 : Expr(DeclRefExprClass, Empty) { } 564 565 /// \brief Computes the type- and value-dependence flags for this 566 /// declaration reference expression. 567 void computeDependence(); 568 569public: 570 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 571 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 572 computeDependence(); 573 } 574 575 static DeclRefExpr *Create(ASTContext &Context, 576 NestedNameSpecifier *Qualifier, 577 SourceRange QualifierRange, 578 ValueDecl *D, 579 SourceLocation NameLoc, 580 QualType T, 581 const TemplateArgumentListInfo *TemplateArgs = 0); 582 583 static DeclRefExpr *Create(ASTContext &Context, 584 NestedNameSpecifier *Qualifier, 585 SourceRange QualifierRange, 586 ValueDecl *D, 587 const DeclarationNameInfo &NameInfo, 588 QualType T, 589 const TemplateArgumentListInfo *TemplateArgs = 0); 590 591 /// \brief Construct an empty declaration reference expression. 592 static DeclRefExpr *CreateEmpty(ASTContext &Context, 593 bool HasQualifier, unsigned NumTemplateArgs); 594 595 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 596 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 597 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 598 599 DeclarationNameInfo getNameInfo() const { 600 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 601 } 602 603 SourceLocation getLocation() const { return Loc; } 604 void setLocation(SourceLocation L) { Loc = L; } 605 virtual SourceRange getSourceRange() const; 606 607 /// \brief Determine whether this declaration reference was preceded by a 608 /// C++ nested-name-specifier, e.g., \c N::foo. 609 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 610 611 /// \brief If the name was qualified, retrieves the source range of 612 /// the nested-name-specifier that precedes the name. Otherwise, 613 /// returns an empty source range. 614 SourceRange getQualifierRange() const { 615 if (!hasQualifier()) 616 return SourceRange(); 617 618 return getNameQualifier()->Range; 619 } 620 621 /// \brief If the name was qualified, retrieves the nested-name-specifier 622 /// that precedes the name. Otherwise, returns NULL. 623 NestedNameSpecifier *getQualifier() const { 624 if (!hasQualifier()) 625 return 0; 626 627 return getNameQualifier()->NNS; 628 } 629 630 bool hasExplicitTemplateArgs() const { 631 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 632 } 633 634 /// \brief Retrieve the explicit template argument list that followed the 635 /// member template name. 636 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 637 assert(hasExplicitTemplateArgs()); 638 639 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 640 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 641 642 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 643 getNameQualifier() + 1); 644 } 645 646 /// \brief Retrieve the explicit template argument list that followed the 647 /// member template name. 648 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 649 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 650 } 651 652 /// \brief Retrieves the optional explicit template arguments. 653 /// This points to the same data as getExplicitTemplateArgs(), but 654 /// returns null if there are no explicit template arguments. 655 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 656 if (!hasExplicitTemplateArgs()) return 0; 657 return &getExplicitTemplateArgs(); 658 } 659 660 /// \brief Copies the template arguments (if present) into the given 661 /// structure. 662 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 663 if (hasExplicitTemplateArgs()) 664 getExplicitTemplateArgs().copyInto(List); 665 } 666 667 /// \brief Retrieve the location of the left angle bracket following the 668 /// member name ('<'), if any. 669 SourceLocation getLAngleLoc() const { 670 if (!hasExplicitTemplateArgs()) 671 return SourceLocation(); 672 673 return getExplicitTemplateArgs().LAngleLoc; 674 } 675 676 /// \brief Retrieve the template arguments provided as part of this 677 /// template-id. 678 const TemplateArgumentLoc *getTemplateArgs() const { 679 if (!hasExplicitTemplateArgs()) 680 return 0; 681 682 return getExplicitTemplateArgs().getTemplateArgs(); 683 } 684 685 /// \brief Retrieve the number of template arguments provided as part of this 686 /// template-id. 687 unsigned getNumTemplateArgs() const { 688 if (!hasExplicitTemplateArgs()) 689 return 0; 690 691 return getExplicitTemplateArgs().NumTemplateArgs; 692 } 693 694 /// \brief Retrieve the location of the right angle bracket following the 695 /// template arguments ('>'). 696 SourceLocation getRAngleLoc() const { 697 if (!hasExplicitTemplateArgs()) 698 return SourceLocation(); 699 700 return getExplicitTemplateArgs().RAngleLoc; 701 } 702 703 static bool classof(const Stmt *T) { 704 return T->getStmtClass() == DeclRefExprClass; 705 } 706 static bool classof(const DeclRefExpr *) { return true; } 707 708 // Iterators 709 virtual child_iterator child_begin(); 710 virtual child_iterator child_end(); 711 712 friend class ASTStmtReader; 713 friend class ASTStmtWriter; 714}; 715 716/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 717class PredefinedExpr : public Expr { 718public: 719 enum IdentType { 720 Func, 721 Function, 722 PrettyFunction, 723 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 724 /// 'virtual' keyword is omitted for virtual member functions. 725 PrettyFunctionNoVirtual 726 }; 727 728private: 729 SourceLocation Loc; 730 IdentType Type; 731public: 732 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 733 : Expr(PredefinedExprClass, type, type->isDependentType(), 734 type->isDependentType()), Loc(l), Type(IT) {} 735 736 /// \brief Construct an empty predefined expression. 737 explicit PredefinedExpr(EmptyShell Empty) 738 : Expr(PredefinedExprClass, Empty) { } 739 740 IdentType getIdentType() const { return Type; } 741 void setIdentType(IdentType IT) { Type = IT; } 742 743 SourceLocation getLocation() const { return Loc; } 744 void setLocation(SourceLocation L) { Loc = L; } 745 746 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 747 748 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 749 750 static bool classof(const Stmt *T) { 751 return T->getStmtClass() == PredefinedExprClass; 752 } 753 static bool classof(const PredefinedExpr *) { return true; } 754 755 // Iterators 756 virtual child_iterator child_begin(); 757 virtual child_iterator child_end(); 758}; 759 760class IntegerLiteral : public Expr { 761 llvm::APInt Value; 762 SourceLocation Loc; 763public: 764 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 765 // or UnsignedLongLongTy 766 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 767 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 768 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 769 } 770 771 /// \brief Construct an empty integer literal. 772 explicit IntegerLiteral(EmptyShell Empty) 773 : Expr(IntegerLiteralClass, Empty) { } 774 775 const llvm::APInt &getValue() const { return Value; } 776 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 777 778 /// \brief Retrieve the location of the literal. 779 SourceLocation getLocation() const { return Loc; } 780 781 void setValue(const llvm::APInt &Val) { Value = Val; } 782 void setLocation(SourceLocation Location) { Loc = Location; } 783 784 static bool classof(const Stmt *T) { 785 return T->getStmtClass() == IntegerLiteralClass; 786 } 787 static bool classof(const IntegerLiteral *) { return true; } 788 789 // Iterators 790 virtual child_iterator child_begin(); 791 virtual child_iterator child_end(); 792}; 793 794class CharacterLiteral : public Expr { 795 unsigned Value; 796 SourceLocation Loc; 797 bool IsWide; 798public: 799 // type should be IntTy 800 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 801 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 802 IsWide(iswide) { 803 } 804 805 /// \brief Construct an empty character literal. 806 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 807 808 SourceLocation getLocation() const { return Loc; } 809 bool isWide() const { return IsWide; } 810 811 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 812 813 unsigned getValue() const { return Value; } 814 815 void setLocation(SourceLocation Location) { Loc = Location; } 816 void setWide(bool W) { IsWide = W; } 817 void setValue(unsigned Val) { Value = Val; } 818 819 static bool classof(const Stmt *T) { 820 return T->getStmtClass() == CharacterLiteralClass; 821 } 822 static bool classof(const CharacterLiteral *) { return true; } 823 824 // Iterators 825 virtual child_iterator child_begin(); 826 virtual child_iterator child_end(); 827}; 828 829class FloatingLiteral : public Expr { 830 llvm::APFloat Value; 831 bool IsExact : 1; 832 SourceLocation Loc; 833public: 834 FloatingLiteral(const llvm::APFloat &V, bool isexact, 835 QualType Type, SourceLocation L) 836 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 837 IsExact(isexact), Loc(L) {} 838 839 /// \brief Construct an empty floating-point literal. 840 explicit FloatingLiteral(EmptyShell Empty) 841 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 842 843 const llvm::APFloat &getValue() const { return Value; } 844 void setValue(const llvm::APFloat &Val) { Value = Val; } 845 846 bool isExact() const { return IsExact; } 847 void setExact(bool E) { IsExact = E; } 848 849 /// getValueAsApproximateDouble - This returns the value as an inaccurate 850 /// double. Note that this may cause loss of precision, but is useful for 851 /// debugging dumps, etc. 852 double getValueAsApproximateDouble() const; 853 854 SourceLocation getLocation() const { return Loc; } 855 void setLocation(SourceLocation L) { Loc = L; } 856 857 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 858 859 static bool classof(const Stmt *T) { 860 return T->getStmtClass() == FloatingLiteralClass; 861 } 862 static bool classof(const FloatingLiteral *) { return true; } 863 864 // Iterators 865 virtual child_iterator child_begin(); 866 virtual child_iterator child_end(); 867}; 868 869/// ImaginaryLiteral - We support imaginary integer and floating point literals, 870/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 871/// IntegerLiteral classes. Instances of this class always have a Complex type 872/// whose element type matches the subexpression. 873/// 874class ImaginaryLiteral : public Expr { 875 Stmt *Val; 876public: 877 ImaginaryLiteral(Expr *val, QualType Ty) 878 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 879 880 /// \brief Build an empty imaginary literal. 881 explicit ImaginaryLiteral(EmptyShell Empty) 882 : Expr(ImaginaryLiteralClass, Empty) { } 883 884 const Expr *getSubExpr() const { return cast<Expr>(Val); } 885 Expr *getSubExpr() { return cast<Expr>(Val); } 886 void setSubExpr(Expr *E) { Val = E; } 887 888 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 889 static bool classof(const Stmt *T) { 890 return T->getStmtClass() == ImaginaryLiteralClass; 891 } 892 static bool classof(const ImaginaryLiteral *) { return true; } 893 894 // Iterators 895 virtual child_iterator child_begin(); 896 virtual child_iterator child_end(); 897}; 898 899/// StringLiteral - This represents a string literal expression, e.g. "foo" 900/// or L"bar" (wide strings). The actual string is returned by getStrData() 901/// is NOT null-terminated, and the length of the string is determined by 902/// calling getByteLength(). The C type for a string is always a 903/// ConstantArrayType. In C++, the char type is const qualified, in C it is 904/// not. 905/// 906/// Note that strings in C can be formed by concatenation of multiple string 907/// literal pptokens in translation phase #6. This keeps track of the locations 908/// of each of these pieces. 909/// 910/// Strings in C can also be truncated and extended by assigning into arrays, 911/// e.g. with constructs like: 912/// char X[2] = "foobar"; 913/// In this case, getByteLength() will return 6, but the string literal will 914/// have type "char[2]". 915class StringLiteral : public Expr { 916 const char *StrData; 917 unsigned ByteLength; 918 bool IsWide; 919 unsigned NumConcatenated; 920 SourceLocation TokLocs[1]; 921 922 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 923 924public: 925 /// This is the "fully general" constructor that allows representation of 926 /// strings formed from multiple concatenated tokens. 927 static StringLiteral *Create(ASTContext &C, const char *StrData, 928 unsigned ByteLength, bool Wide, QualType Ty, 929 const SourceLocation *Loc, unsigned NumStrs); 930 931 /// Simple constructor for string literals made from one token. 932 static StringLiteral *Create(ASTContext &C, const char *StrData, 933 unsigned ByteLength, 934 bool Wide, QualType Ty, SourceLocation Loc) { 935 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 936 } 937 938 /// \brief Construct an empty string literal. 939 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 940 941 llvm::StringRef getString() const { 942 return llvm::StringRef(StrData, ByteLength); 943 } 944 945 unsigned getByteLength() const { return ByteLength; } 946 947 /// \brief Sets the string data to the given string data. 948 void setString(ASTContext &C, llvm::StringRef Str); 949 950 bool isWide() const { return IsWide; } 951 void setWide(bool W) { IsWide = W; } 952 953 bool containsNonAsciiOrNull() const { 954 llvm::StringRef Str = getString(); 955 for (unsigned i = 0, e = Str.size(); i != e; ++i) 956 if (!isascii(Str[i]) || !Str[i]) 957 return true; 958 return false; 959 } 960 /// getNumConcatenated - Get the number of string literal tokens that were 961 /// concatenated in translation phase #6 to form this string literal. 962 unsigned getNumConcatenated() const { return NumConcatenated; } 963 964 SourceLocation getStrTokenLoc(unsigned TokNum) const { 965 assert(TokNum < NumConcatenated && "Invalid tok number"); 966 return TokLocs[TokNum]; 967 } 968 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 969 assert(TokNum < NumConcatenated && "Invalid tok number"); 970 TokLocs[TokNum] = L; 971 } 972 973 typedef const SourceLocation *tokloc_iterator; 974 tokloc_iterator tokloc_begin() const { return TokLocs; } 975 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 976 977 virtual SourceRange getSourceRange() const { 978 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 979 } 980 static bool classof(const Stmt *T) { 981 return T->getStmtClass() == StringLiteralClass; 982 } 983 static bool classof(const StringLiteral *) { return true; } 984 985 // Iterators 986 virtual child_iterator child_begin(); 987 virtual child_iterator child_end(); 988}; 989 990/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 991/// AST node is only formed if full location information is requested. 992class ParenExpr : public Expr { 993 SourceLocation L, R; 994 Stmt *Val; 995public: 996 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 997 : Expr(ParenExprClass, val->getType(), 998 val->isTypeDependent(), val->isValueDependent()), 999 L(l), R(r), Val(val) {} 1000 1001 /// \brief Construct an empty parenthesized expression. 1002 explicit ParenExpr(EmptyShell Empty) 1003 : Expr(ParenExprClass, Empty) { } 1004 1005 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1006 Expr *getSubExpr() { return cast<Expr>(Val); } 1007 void setSubExpr(Expr *E) { Val = E; } 1008 1009 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1010 1011 /// \brief Get the location of the left parentheses '('. 1012 SourceLocation getLParen() const { return L; } 1013 void setLParen(SourceLocation Loc) { L = Loc; } 1014 1015 /// \brief Get the location of the right parentheses ')'. 1016 SourceLocation getRParen() const { return R; } 1017 void setRParen(SourceLocation Loc) { R = Loc; } 1018 1019 static bool classof(const Stmt *T) { 1020 return T->getStmtClass() == ParenExprClass; 1021 } 1022 static bool classof(const ParenExpr *) { return true; } 1023 1024 // Iterators 1025 virtual child_iterator child_begin(); 1026 virtual child_iterator child_end(); 1027}; 1028 1029 1030/// UnaryOperator - This represents the unary-expression's (except sizeof and 1031/// alignof), the postinc/postdec operators from postfix-expression, and various 1032/// extensions. 1033/// 1034/// Notes on various nodes: 1035/// 1036/// Real/Imag - These return the real/imag part of a complex operand. If 1037/// applied to a non-complex value, the former returns its operand and the 1038/// later returns zero in the type of the operand. 1039/// 1040class UnaryOperator : public Expr { 1041public: 1042 typedef UnaryOperatorKind Opcode; 1043 1044private: 1045 unsigned Opc : 5; 1046 SourceLocation Loc; 1047 Stmt *Val; 1048public: 1049 1050 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 1051 : Expr(UnaryOperatorClass, type, 1052 input->isTypeDependent() || type->isDependentType(), 1053 input->isValueDependent()), 1054 Opc(opc), Loc(l), Val(input) {} 1055 1056 /// \brief Build an empty unary operator. 1057 explicit UnaryOperator(EmptyShell Empty) 1058 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1059 1060 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1061 void setOpcode(Opcode O) { Opc = O; } 1062 1063 Expr *getSubExpr() const { return cast<Expr>(Val); } 1064 void setSubExpr(Expr *E) { Val = E; } 1065 1066 /// getOperatorLoc - Return the location of the operator. 1067 SourceLocation getOperatorLoc() const { return Loc; } 1068 void setOperatorLoc(SourceLocation L) { Loc = L; } 1069 1070 /// isPostfix - Return true if this is a postfix operation, like x++. 1071 static bool isPostfix(Opcode Op) { 1072 return Op == UO_PostInc || Op == UO_PostDec; 1073 } 1074 1075 /// isPostfix - Return true if this is a prefix operation, like --x. 1076 static bool isPrefix(Opcode Op) { 1077 return Op == UO_PreInc || Op == UO_PreDec; 1078 } 1079 1080 bool isPrefix() const { return isPrefix(getOpcode()); } 1081 bool isPostfix() const { return isPostfix(getOpcode()); } 1082 bool isIncrementOp() const { 1083 return Opc == UO_PreInc || getOpcode() == UO_PostInc; 1084 } 1085 bool isIncrementDecrementOp() const { 1086 return Opc >= UO_PostInc && Opc <= UO_PreDec; 1087 } 1088 static bool isArithmeticOp(Opcode Op) { 1089 return Op >= UO_Plus && Op <= UO_LNot; 1090 } 1091 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1092 1093 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1094 /// corresponds to, e.g. "sizeof" or "[pre]++" 1095 static const char *getOpcodeStr(Opcode Op); 1096 1097 /// \brief Retrieve the unary opcode that corresponds to the given 1098 /// overloaded operator. 1099 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1100 1101 /// \brief Retrieve the overloaded operator kind that corresponds to 1102 /// the given unary opcode. 1103 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1104 1105 virtual SourceRange getSourceRange() const { 1106 if (isPostfix()) 1107 return SourceRange(Val->getLocStart(), Loc); 1108 else 1109 return SourceRange(Loc, Val->getLocEnd()); 1110 } 1111 virtual SourceLocation getExprLoc() const { return Loc; } 1112 1113 static bool classof(const Stmt *T) { 1114 return T->getStmtClass() == UnaryOperatorClass; 1115 } 1116 static bool classof(const UnaryOperator *) { return true; } 1117 1118 // Iterators 1119 virtual child_iterator child_begin(); 1120 virtual child_iterator child_end(); 1121}; 1122 1123/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1124/// offsetof(record-type, member-designator). For example, given: 1125/// @code 1126/// struct S { 1127/// float f; 1128/// double d; 1129/// }; 1130/// struct T { 1131/// int i; 1132/// struct S s[10]; 1133/// }; 1134/// @endcode 1135/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1136 1137class OffsetOfExpr : public Expr { 1138public: 1139 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1140 class OffsetOfNode { 1141 public: 1142 /// \brief The kind of offsetof node we have. 1143 enum Kind { 1144 /// \brief An index into an array. 1145 Array = 0x00, 1146 /// \brief A field. 1147 Field = 0x01, 1148 /// \brief A field in a dependent type, known only by its name. 1149 Identifier = 0x02, 1150 /// \brief An implicit indirection through a C++ base class, when the 1151 /// field found is in a base class. 1152 Base = 0x03 1153 }; 1154 1155 private: 1156 enum { MaskBits = 2, Mask = 0x03 }; 1157 1158 /// \brief The source range that covers this part of the designator. 1159 SourceRange Range; 1160 1161 /// \brief The data describing the designator, which comes in three 1162 /// different forms, depending on the lower two bits. 1163 /// - An unsigned index into the array of Expr*'s stored after this node 1164 /// in memory, for [constant-expression] designators. 1165 /// - A FieldDecl*, for references to a known field. 1166 /// - An IdentifierInfo*, for references to a field with a given name 1167 /// when the class type is dependent. 1168 /// - A CXXBaseSpecifier*, for references that look at a field in a 1169 /// base class. 1170 uintptr_t Data; 1171 1172 public: 1173 /// \brief Create an offsetof node that refers to an array element. 1174 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1175 SourceLocation RBracketLoc) 1176 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1177 1178 /// \brief Create an offsetof node that refers to a field. 1179 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1180 SourceLocation NameLoc) 1181 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1182 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1183 1184 /// \brief Create an offsetof node that refers to an identifier. 1185 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1186 SourceLocation NameLoc) 1187 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1188 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1189 1190 /// \brief Create an offsetof node that refers into a C++ base class. 1191 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1192 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1193 1194 /// \brief Determine what kind of offsetof node this is. 1195 Kind getKind() const { 1196 return static_cast<Kind>(Data & Mask); 1197 } 1198 1199 /// \brief For an array element node, returns the index into the array 1200 /// of expressions. 1201 unsigned getArrayExprIndex() const { 1202 assert(getKind() == Array); 1203 return Data >> 2; 1204 } 1205 1206 /// \brief For a field offsetof node, returns the field. 1207 FieldDecl *getField() const { 1208 assert(getKind() == Field); 1209 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1210 } 1211 1212 /// \brief For a field or identifier offsetof node, returns the name of 1213 /// the field. 1214 IdentifierInfo *getFieldName() const; 1215 1216 /// \brief For a base class node, returns the base specifier. 1217 CXXBaseSpecifier *getBase() const { 1218 assert(getKind() == Base); 1219 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1220 } 1221 1222 /// \brief Retrieve the source range that covers this offsetof node. 1223 /// 1224 /// For an array element node, the source range contains the locations of 1225 /// the square brackets. For a field or identifier node, the source range 1226 /// contains the location of the period (if there is one) and the 1227 /// identifier. 1228 SourceRange getRange() const { return Range; } 1229 }; 1230 1231private: 1232 1233 SourceLocation OperatorLoc, RParenLoc; 1234 // Base type; 1235 TypeSourceInfo *TSInfo; 1236 // Number of sub-components (i.e. instances of OffsetOfNode). 1237 unsigned NumComps; 1238 // Number of sub-expressions (i.e. array subscript expressions). 1239 unsigned NumExprs; 1240 1241 OffsetOfExpr(ASTContext &C, QualType type, 1242 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1243 OffsetOfNode* compsPtr, unsigned numComps, 1244 Expr** exprsPtr, unsigned numExprs, 1245 SourceLocation RParenLoc); 1246 1247 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1248 : Expr(OffsetOfExprClass, EmptyShell()), 1249 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1250 1251public: 1252 1253 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1254 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1255 OffsetOfNode* compsPtr, unsigned numComps, 1256 Expr** exprsPtr, unsigned numExprs, 1257 SourceLocation RParenLoc); 1258 1259 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1260 unsigned NumComps, unsigned NumExprs); 1261 1262 /// getOperatorLoc - Return the location of the operator. 1263 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1264 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1265 1266 /// \brief Return the location of the right parentheses. 1267 SourceLocation getRParenLoc() const { return RParenLoc; } 1268 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1269 1270 TypeSourceInfo *getTypeSourceInfo() const { 1271 return TSInfo; 1272 } 1273 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1274 TSInfo = tsi; 1275 } 1276 1277 const OffsetOfNode &getComponent(unsigned Idx) { 1278 assert(Idx < NumComps && "Subscript out of range"); 1279 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1280 } 1281 1282 void setComponent(unsigned Idx, OffsetOfNode ON) { 1283 assert(Idx < NumComps && "Subscript out of range"); 1284 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1285 } 1286 1287 unsigned getNumComponents() const { 1288 return NumComps; 1289 } 1290 1291 Expr* getIndexExpr(unsigned Idx) { 1292 assert(Idx < NumExprs && "Subscript out of range"); 1293 return reinterpret_cast<Expr **>( 1294 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1295 } 1296 1297 void setIndexExpr(unsigned Idx, Expr* E) { 1298 assert(Idx < NumComps && "Subscript out of range"); 1299 reinterpret_cast<Expr **>( 1300 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1301 } 1302 1303 unsigned getNumExpressions() const { 1304 return NumExprs; 1305 } 1306 1307 virtual SourceRange getSourceRange() const { 1308 return SourceRange(OperatorLoc, RParenLoc); 1309 } 1310 1311 static bool classof(const Stmt *T) { 1312 return T->getStmtClass() == OffsetOfExprClass; 1313 } 1314 1315 static bool classof(const OffsetOfExpr *) { return true; } 1316 1317 // Iterators 1318 virtual child_iterator child_begin(); 1319 virtual child_iterator child_end(); 1320}; 1321 1322/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1323/// types and expressions. 1324class SizeOfAlignOfExpr : public Expr { 1325 bool isSizeof : 1; // true if sizeof, false if alignof. 1326 bool isType : 1; // true if operand is a type, false if an expression 1327 union { 1328 TypeSourceInfo *Ty; 1329 Stmt *Ex; 1330 } Argument; 1331 SourceLocation OpLoc, RParenLoc; 1332 1333public: 1334 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1335 QualType resultType, SourceLocation op, 1336 SourceLocation rp) : 1337 Expr(SizeOfAlignOfExprClass, resultType, 1338 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1339 // Value-dependent if the argument is type-dependent. 1340 TInfo->getType()->isDependentType()), 1341 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1342 Argument.Ty = TInfo; 1343 } 1344 1345 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1346 QualType resultType, SourceLocation op, 1347 SourceLocation rp) : 1348 Expr(SizeOfAlignOfExprClass, resultType, 1349 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1350 // Value-dependent if the argument is type-dependent. 1351 E->isTypeDependent()), 1352 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1353 Argument.Ex = E; 1354 } 1355 1356 /// \brief Construct an empty sizeof/alignof expression. 1357 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1358 : Expr(SizeOfAlignOfExprClass, Empty) { } 1359 1360 bool isSizeOf() const { return isSizeof; } 1361 void setSizeof(bool S) { isSizeof = S; } 1362 1363 bool isArgumentType() const { return isType; } 1364 QualType getArgumentType() const { 1365 return getArgumentTypeInfo()->getType(); 1366 } 1367 TypeSourceInfo *getArgumentTypeInfo() const { 1368 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1369 return Argument.Ty; 1370 } 1371 Expr *getArgumentExpr() { 1372 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1373 return static_cast<Expr*>(Argument.Ex); 1374 } 1375 const Expr *getArgumentExpr() const { 1376 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1377 } 1378 1379 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1380 void setArgument(TypeSourceInfo *TInfo) { 1381 Argument.Ty = TInfo; 1382 isType = true; 1383 } 1384 1385 /// Gets the argument type, or the type of the argument expression, whichever 1386 /// is appropriate. 1387 QualType getTypeOfArgument() const { 1388 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1389 } 1390 1391 SourceLocation getOperatorLoc() const { return OpLoc; } 1392 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1393 1394 SourceLocation getRParenLoc() const { return RParenLoc; } 1395 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1396 1397 virtual SourceRange getSourceRange() const { 1398 return SourceRange(OpLoc, RParenLoc); 1399 } 1400 1401 static bool classof(const Stmt *T) { 1402 return T->getStmtClass() == SizeOfAlignOfExprClass; 1403 } 1404 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1405 1406 // Iterators 1407 virtual child_iterator child_begin(); 1408 virtual child_iterator child_end(); 1409}; 1410 1411//===----------------------------------------------------------------------===// 1412// Postfix Operators. 1413//===----------------------------------------------------------------------===// 1414 1415/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1416class ArraySubscriptExpr : public Expr { 1417 enum { LHS, RHS, END_EXPR=2 }; 1418 Stmt* SubExprs[END_EXPR]; 1419 SourceLocation RBracketLoc; 1420public: 1421 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1422 SourceLocation rbracketloc) 1423 : Expr(ArraySubscriptExprClass, t, 1424 lhs->isTypeDependent() || rhs->isTypeDependent(), 1425 lhs->isValueDependent() || rhs->isValueDependent()), 1426 RBracketLoc(rbracketloc) { 1427 SubExprs[LHS] = lhs; 1428 SubExprs[RHS] = rhs; 1429 } 1430 1431 /// \brief Create an empty array subscript expression. 1432 explicit ArraySubscriptExpr(EmptyShell Shell) 1433 : Expr(ArraySubscriptExprClass, Shell) { } 1434 1435 /// An array access can be written A[4] or 4[A] (both are equivalent). 1436 /// - getBase() and getIdx() always present the normalized view: A[4]. 1437 /// In this case getBase() returns "A" and getIdx() returns "4". 1438 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1439 /// 4[A] getLHS() returns "4". 1440 /// Note: Because vector element access is also written A[4] we must 1441 /// predicate the format conversion in getBase and getIdx only on the 1442 /// the type of the RHS, as it is possible for the LHS to be a vector of 1443 /// integer type 1444 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1445 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1446 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1447 1448 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1449 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1450 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1451 1452 Expr *getBase() { 1453 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1454 } 1455 1456 const Expr *getBase() const { 1457 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1458 } 1459 1460 Expr *getIdx() { 1461 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1462 } 1463 1464 const Expr *getIdx() const { 1465 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1466 } 1467 1468 virtual SourceRange getSourceRange() const { 1469 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1470 } 1471 1472 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1473 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1474 1475 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1476 1477 static bool classof(const Stmt *T) { 1478 return T->getStmtClass() == ArraySubscriptExprClass; 1479 } 1480 static bool classof(const ArraySubscriptExpr *) { return true; } 1481 1482 // Iterators 1483 virtual child_iterator child_begin(); 1484 virtual child_iterator child_end(); 1485}; 1486 1487 1488/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1489/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1490/// while its subclasses may represent alternative syntax that (semantically) 1491/// results in a function call. For example, CXXOperatorCallExpr is 1492/// a subclass for overloaded operator calls that use operator syntax, e.g., 1493/// "str1 + str2" to resolve to a function call. 1494class CallExpr : public Expr { 1495 enum { FN=0, ARGS_START=1 }; 1496 Stmt **SubExprs; 1497 unsigned NumArgs; 1498 SourceLocation RParenLoc; 1499 1500protected: 1501 // This version of the constructor is for derived classes. 1502 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1503 QualType t, SourceLocation rparenloc); 1504 1505public: 1506 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1507 SourceLocation rparenloc); 1508 1509 /// \brief Build an empty call expression. 1510 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1511 1512 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1513 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1514 void setCallee(Expr *F) { SubExprs[FN] = F; } 1515 1516 Decl *getCalleeDecl(); 1517 const Decl *getCalleeDecl() const { 1518 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1519 } 1520 1521 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1522 FunctionDecl *getDirectCallee(); 1523 const FunctionDecl *getDirectCallee() const { 1524 return const_cast<CallExpr*>(this)->getDirectCallee(); 1525 } 1526 1527 /// getNumArgs - Return the number of actual arguments to this call. 1528 /// 1529 unsigned getNumArgs() const { return NumArgs; } 1530 1531 /// getArg - Return the specified argument. 1532 Expr *getArg(unsigned Arg) { 1533 assert(Arg < NumArgs && "Arg access out of range!"); 1534 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1535 } 1536 const Expr *getArg(unsigned Arg) const { 1537 assert(Arg < NumArgs && "Arg access out of range!"); 1538 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1539 } 1540 1541 /// setArg - Set the specified argument. 1542 void setArg(unsigned Arg, Expr *ArgExpr) { 1543 assert(Arg < NumArgs && "Arg access out of range!"); 1544 SubExprs[Arg+ARGS_START] = ArgExpr; 1545 } 1546 1547 /// setNumArgs - This changes the number of arguments present in this call. 1548 /// Any orphaned expressions are deleted by this, and any new operands are set 1549 /// to null. 1550 void setNumArgs(ASTContext& C, unsigned NumArgs); 1551 1552 typedef ExprIterator arg_iterator; 1553 typedef ConstExprIterator const_arg_iterator; 1554 1555 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1556 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1557 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1558 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1559 1560 /// getNumCommas - Return the number of commas that must have been present in 1561 /// this function call. 1562 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1563 1564 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1565 /// not, return 0. 1566 unsigned isBuiltinCall(ASTContext &Context) const; 1567 1568 /// getCallReturnType - Get the return type of the call expr. This is not 1569 /// always the type of the expr itself, if the return type is a reference 1570 /// type. 1571 QualType getCallReturnType() const; 1572 1573 SourceLocation getRParenLoc() const { return RParenLoc; } 1574 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1575 1576 virtual SourceRange getSourceRange() const { 1577 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1578 } 1579 1580 static bool classof(const Stmt *T) { 1581 return T->getStmtClass() >= firstCallExprConstant && 1582 T->getStmtClass() <= lastCallExprConstant; 1583 } 1584 static bool classof(const CallExpr *) { return true; } 1585 1586 // Iterators 1587 virtual child_iterator child_begin(); 1588 virtual child_iterator child_end(); 1589}; 1590 1591/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1592/// 1593class MemberExpr : public Expr { 1594 /// Extra data stored in some member expressions. 1595 struct MemberNameQualifier : public NameQualifier { 1596 DeclAccessPair FoundDecl; 1597 }; 1598 1599 /// Base - the expression for the base pointer or structure references. In 1600 /// X.F, this is "X". 1601 Stmt *Base; 1602 1603 /// MemberDecl - This is the decl being referenced by the field/member name. 1604 /// In X.F, this is the decl referenced by F. 1605 ValueDecl *MemberDecl; 1606 1607 /// MemberLoc - This is the location of the member name. 1608 SourceLocation MemberLoc; 1609 1610 /// MemberDNLoc - Provides source/type location info for the 1611 /// declaration name embedded in MemberDecl. 1612 DeclarationNameLoc MemberDNLoc; 1613 1614 /// IsArrow - True if this is "X->F", false if this is "X.F". 1615 bool IsArrow : 1; 1616 1617 /// \brief True if this member expression used a nested-name-specifier to 1618 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1619 /// declaration. When true, a MemberNameQualifier 1620 /// structure is allocated immediately after the MemberExpr. 1621 bool HasQualifierOrFoundDecl : 1; 1622 1623 /// \brief True if this member expression specified a template argument list 1624 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1625 /// structure (and its TemplateArguments) are allocated immediately after 1626 /// the MemberExpr or, if the member expression also has a qualifier, after 1627 /// the MemberNameQualifier structure. 1628 bool HasExplicitTemplateArgumentList : 1; 1629 1630 /// \brief Retrieve the qualifier that preceded the member name, if any. 1631 MemberNameQualifier *getMemberQualifier() { 1632 assert(HasQualifierOrFoundDecl); 1633 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1634 } 1635 1636 /// \brief Retrieve the qualifier that preceded the member name, if any. 1637 const MemberNameQualifier *getMemberQualifier() const { 1638 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1639 } 1640 1641public: 1642 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1643 const DeclarationNameInfo &NameInfo, QualType ty) 1644 : Expr(MemberExprClass, ty, 1645 base->isTypeDependent(), base->isValueDependent()), 1646 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1647 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1648 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1649 assert(memberdecl->getDeclName() == NameInfo.getName()); 1650 } 1651 1652 // NOTE: this constructor should be used only when it is known that 1653 // the member name can not provide additional syntactic info 1654 // (i.e., source locations for C++ operator names or type source info 1655 // for constructors, destructors and conversion oeprators). 1656 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1657 SourceLocation l, QualType ty) 1658 : Expr(MemberExprClass, ty, 1659 base->isTypeDependent(), base->isValueDependent()), 1660 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1661 IsArrow(isarrow), 1662 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1663 1664 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1665 NestedNameSpecifier *qual, SourceRange qualrange, 1666 ValueDecl *memberdecl, DeclAccessPair founddecl, 1667 DeclarationNameInfo MemberNameInfo, 1668 const TemplateArgumentListInfo *targs, 1669 QualType ty); 1670 1671 void setBase(Expr *E) { Base = E; } 1672 Expr *getBase() const { return cast<Expr>(Base); } 1673 1674 /// \brief Retrieve the member declaration to which this expression refers. 1675 /// 1676 /// The returned declaration will either be a FieldDecl or (in C++) 1677 /// a CXXMethodDecl. 1678 ValueDecl *getMemberDecl() const { return MemberDecl; } 1679 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1680 1681 /// \brief Retrieves the declaration found by lookup. 1682 DeclAccessPair getFoundDecl() const { 1683 if (!HasQualifierOrFoundDecl) 1684 return DeclAccessPair::make(getMemberDecl(), 1685 getMemberDecl()->getAccess()); 1686 return getMemberQualifier()->FoundDecl; 1687 } 1688 1689 /// \brief Determines whether this member expression actually had 1690 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1691 /// x->Base::foo. 1692 bool hasQualifier() const { return getQualifier() != 0; } 1693 1694 /// \brief If the member name was qualified, retrieves the source range of 1695 /// the nested-name-specifier that precedes the member name. Otherwise, 1696 /// returns an empty source range. 1697 SourceRange getQualifierRange() const { 1698 if (!HasQualifierOrFoundDecl) 1699 return SourceRange(); 1700 1701 return getMemberQualifier()->Range; 1702 } 1703 1704 /// \brief If the member name was qualified, retrieves the 1705 /// nested-name-specifier that precedes the member name. Otherwise, returns 1706 /// NULL. 1707 NestedNameSpecifier *getQualifier() const { 1708 if (!HasQualifierOrFoundDecl) 1709 return 0; 1710 1711 return getMemberQualifier()->NNS; 1712 } 1713 1714 /// \brief Determines whether this member expression actually had a C++ 1715 /// template argument list explicitly specified, e.g., x.f<int>. 1716 bool hasExplicitTemplateArgs() const { 1717 return HasExplicitTemplateArgumentList; 1718 } 1719 1720 /// \brief Copies the template arguments (if present) into the given 1721 /// structure. 1722 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1723 if (hasExplicitTemplateArgs()) 1724 getExplicitTemplateArgs().copyInto(List); 1725 } 1726 1727 /// \brief Retrieve the explicit template argument list that 1728 /// follow the member template name. This must only be called on an 1729 /// expression with explicit template arguments. 1730 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1731 assert(HasExplicitTemplateArgumentList); 1732 if (!HasQualifierOrFoundDecl) 1733 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1734 1735 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1736 getMemberQualifier() + 1); 1737 } 1738 1739 /// \brief Retrieve the explicit template argument list that 1740 /// followed the member template name. This must only be called on 1741 /// an expression with explicit template arguments. 1742 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1743 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1744 } 1745 1746 /// \brief Retrieves the optional explicit template arguments. 1747 /// This points to the same data as getExplicitTemplateArgs(), but 1748 /// returns null if there are no explicit template arguments. 1749 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1750 if (!hasExplicitTemplateArgs()) return 0; 1751 return &getExplicitTemplateArgs(); 1752 } 1753 1754 /// \brief Retrieve the location of the left angle bracket following the 1755 /// member name ('<'), if any. 1756 SourceLocation getLAngleLoc() const { 1757 if (!HasExplicitTemplateArgumentList) 1758 return SourceLocation(); 1759 1760 return getExplicitTemplateArgs().LAngleLoc; 1761 } 1762 1763 /// \brief Retrieve the template arguments provided as part of this 1764 /// template-id. 1765 const TemplateArgumentLoc *getTemplateArgs() const { 1766 if (!HasExplicitTemplateArgumentList) 1767 return 0; 1768 1769 return getExplicitTemplateArgs().getTemplateArgs(); 1770 } 1771 1772 /// \brief Retrieve the number of template arguments provided as part of this 1773 /// template-id. 1774 unsigned getNumTemplateArgs() const { 1775 if (!HasExplicitTemplateArgumentList) 1776 return 0; 1777 1778 return getExplicitTemplateArgs().NumTemplateArgs; 1779 } 1780 1781 /// \brief Retrieve the location of the right angle bracket following the 1782 /// template arguments ('>'). 1783 SourceLocation getRAngleLoc() const { 1784 if (!HasExplicitTemplateArgumentList) 1785 return SourceLocation(); 1786 1787 return getExplicitTemplateArgs().RAngleLoc; 1788 } 1789 1790 /// \brief Retrieve the member declaration name info. 1791 DeclarationNameInfo getMemberNameInfo() const { 1792 return DeclarationNameInfo(MemberDecl->getDeclName(), 1793 MemberLoc, MemberDNLoc); 1794 } 1795 1796 bool isArrow() const { return IsArrow; } 1797 void setArrow(bool A) { IsArrow = A; } 1798 1799 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1800 /// location of 'F'. 1801 SourceLocation getMemberLoc() const { return MemberLoc; } 1802 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1803 1804 virtual SourceRange getSourceRange() const { 1805 // If we have an implicit base (like a C++ implicit this), 1806 // make sure not to return its location 1807 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1808 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1809 1810 SourceLocation BaseLoc = getBase()->getLocStart(); 1811 if (BaseLoc.isInvalid()) 1812 return SourceRange(MemberLoc, EndLoc); 1813 return SourceRange(BaseLoc, EndLoc); 1814 } 1815 1816 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1817 1818 static bool classof(const Stmt *T) { 1819 return T->getStmtClass() == MemberExprClass; 1820 } 1821 static bool classof(const MemberExpr *) { return true; } 1822 1823 // Iterators 1824 virtual child_iterator child_begin(); 1825 virtual child_iterator child_end(); 1826}; 1827 1828/// CompoundLiteralExpr - [C99 6.5.2.5] 1829/// 1830class CompoundLiteralExpr : public Expr { 1831 /// LParenLoc - If non-null, this is the location of the left paren in a 1832 /// compound literal like "(int){4}". This can be null if this is a 1833 /// synthesized compound expression. 1834 SourceLocation LParenLoc; 1835 1836 /// The type as written. This can be an incomplete array type, in 1837 /// which case the actual expression type will be different. 1838 TypeSourceInfo *TInfo; 1839 Stmt *Init; 1840 bool FileScope; 1841public: 1842 // FIXME: Can compound literals be value-dependent? 1843 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1844 QualType T, Expr *init, bool fileScope) 1845 : Expr(CompoundLiteralExprClass, T, 1846 tinfo->getType()->isDependentType(), false), 1847 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1848 1849 /// \brief Construct an empty compound literal. 1850 explicit CompoundLiteralExpr(EmptyShell Empty) 1851 : Expr(CompoundLiteralExprClass, Empty) { } 1852 1853 const Expr *getInitializer() const { return cast<Expr>(Init); } 1854 Expr *getInitializer() { return cast<Expr>(Init); } 1855 void setInitializer(Expr *E) { Init = E; } 1856 1857 bool isFileScope() const { return FileScope; } 1858 void setFileScope(bool FS) { FileScope = FS; } 1859 1860 SourceLocation getLParenLoc() const { return LParenLoc; } 1861 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1862 1863 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1864 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1865 1866 virtual SourceRange getSourceRange() const { 1867 // FIXME: Init should never be null. 1868 if (!Init) 1869 return SourceRange(); 1870 if (LParenLoc.isInvalid()) 1871 return Init->getSourceRange(); 1872 return SourceRange(LParenLoc, Init->getLocEnd()); 1873 } 1874 1875 static bool classof(const Stmt *T) { 1876 return T->getStmtClass() == CompoundLiteralExprClass; 1877 } 1878 static bool classof(const CompoundLiteralExpr *) { return true; } 1879 1880 // Iterators 1881 virtual child_iterator child_begin(); 1882 virtual child_iterator child_end(); 1883}; 1884 1885/// CastExpr - Base class for type casts, including both implicit 1886/// casts (ImplicitCastExpr) and explicit casts that have some 1887/// representation in the source code (ExplicitCastExpr's derived 1888/// classes). 1889class CastExpr : public Expr { 1890public: 1891 typedef clang::CastKind CastKind; 1892 1893private: 1894 unsigned Kind : 5; 1895 unsigned BasePathSize : BitsRemaining - 5; 1896 Stmt *Op; 1897 1898 void CheckBasePath() const { 1899#ifndef NDEBUG 1900 switch (getCastKind()) { 1901 case CK_DerivedToBase: 1902 case CK_UncheckedDerivedToBase: 1903 case CK_DerivedToBaseMemberPointer: 1904 case CK_BaseToDerived: 1905 case CK_BaseToDerivedMemberPointer: 1906 assert(!path_empty() && "Cast kind should have a base path!"); 1907 break; 1908 1909 // These should not have an inheritance path. 1910 case CK_Unknown: 1911 case CK_BitCast: 1912 case CK_LValueBitCast: 1913 case CK_NoOp: 1914 case CK_Dynamic: 1915 case CK_ToUnion: 1916 case CK_ArrayToPointerDecay: 1917 case CK_FunctionToPointerDecay: 1918 case CK_NullToMemberPointer: 1919 case CK_UserDefinedConversion: 1920 case CK_ConstructorConversion: 1921 case CK_IntegralToPointer: 1922 case CK_PointerToIntegral: 1923 case CK_ToVoid: 1924 case CK_VectorSplat: 1925 case CK_IntegralCast: 1926 case CK_IntegralToFloating: 1927 case CK_FloatingToIntegral: 1928 case CK_FloatingCast: 1929 case CK_MemberPointerToBoolean: 1930 case CK_AnyPointerToObjCPointerCast: 1931 case CK_AnyPointerToBlockPointerCast: 1932 case CK_ObjCObjectLValueCast: 1933 assert(path_empty() && "Cast kind should not have a base path!"); 1934 break; 1935 } 1936#endif 1937 } 1938 1939 const CXXBaseSpecifier * const *path_buffer() const { 1940 return const_cast<CastExpr*>(this)->path_buffer(); 1941 } 1942 CXXBaseSpecifier **path_buffer(); 1943 1944protected: 1945 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1946 unsigned BasePathSize) : 1947 Expr(SC, ty, 1948 // Cast expressions are type-dependent if the type is 1949 // dependent (C++ [temp.dep.expr]p3). 1950 ty->isDependentType(), 1951 // Cast expressions are value-dependent if the type is 1952 // dependent or if the subexpression is value-dependent. 1953 ty->isDependentType() || (op && op->isValueDependent())), 1954 Kind(kind), BasePathSize(BasePathSize), Op(op) { 1955 CheckBasePath(); 1956 } 1957 1958 /// \brief Construct an empty cast. 1959 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 1960 : Expr(SC, Empty), BasePathSize(BasePathSize) { } 1961 1962public: 1963 CastKind getCastKind() const { return static_cast<CastKind>(Kind); } 1964 void setCastKind(CastKind K) { Kind = K; } 1965 const char *getCastKindName() const; 1966 1967 Expr *getSubExpr() { return cast<Expr>(Op); } 1968 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1969 void setSubExpr(Expr *E) { Op = E; } 1970 1971 /// \brief Retrieve the cast subexpression as it was written in the source 1972 /// code, looking through any implicit casts or other intermediate nodes 1973 /// introduced by semantic analysis. 1974 Expr *getSubExprAsWritten(); 1975 const Expr *getSubExprAsWritten() const { 1976 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 1977 } 1978 1979 typedef CXXBaseSpecifier **path_iterator; 1980 typedef const CXXBaseSpecifier * const *path_const_iterator; 1981 bool path_empty() const { return BasePathSize == 0; } 1982 unsigned path_size() const { return BasePathSize; } 1983 path_iterator path_begin() { return path_buffer(); } 1984 path_iterator path_end() { return path_buffer() + path_size(); } 1985 path_const_iterator path_begin() const { return path_buffer(); } 1986 path_const_iterator path_end() const { return path_buffer() + path_size(); } 1987 1988 void setCastPath(const CXXCastPath &Path); 1989 1990 static bool classof(const Stmt *T) { 1991 return T->getStmtClass() >= firstCastExprConstant && 1992 T->getStmtClass() <= lastCastExprConstant; 1993 } 1994 static bool classof(const CastExpr *) { return true; } 1995 1996 // Iterators 1997 virtual child_iterator child_begin(); 1998 virtual child_iterator child_end(); 1999}; 2000 2001/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2002/// conversions, which have no direct representation in the original 2003/// source code. For example: converting T[]->T*, void f()->void 2004/// (*f)(), float->double, short->int, etc. 2005/// 2006/// In C, implicit casts always produce rvalues. However, in C++, an 2007/// implicit cast whose result is being bound to a reference will be 2008/// an lvalue or xvalue. For example: 2009/// 2010/// @code 2011/// class Base { }; 2012/// class Derived : public Base { }; 2013/// Derived &&ref(); 2014/// void f(Derived d) { 2015/// Base& b = d; // initializer is an ImplicitCastExpr 2016/// // to an lvalue of type Base 2017/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2018/// // to an xvalue of type Base 2019/// } 2020/// @endcode 2021class ImplicitCastExpr : public CastExpr { 2022private: 2023 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2024 unsigned BasePathLength, ExprValueKind VK) 2025 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePathLength) { 2026 ValueKind = VK; 2027 } 2028 2029 /// \brief Construct an empty implicit cast. 2030 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2031 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2032 2033public: 2034 enum OnStack_t { OnStack }; 2035 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2036 ExprValueKind VK) 2037 : CastExpr(ImplicitCastExprClass, ty, kind, op, 0) { 2038 ValueKind = VK; 2039 } 2040 2041 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2042 CastKind Kind, Expr *Operand, 2043 const CXXCastPath *BasePath, 2044 ExprValueKind Cat); 2045 2046 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2047 2048 virtual SourceRange getSourceRange() const { 2049 return getSubExpr()->getSourceRange(); 2050 } 2051 2052 /// getValueKind - The value kind that this cast produces. 2053 ExprValueKind getValueKind() const { 2054 return static_cast<ExprValueKind>(ValueKind); 2055 } 2056 2057 /// setValueKind - Set the value kind this cast produces. 2058 void setValueKind(ExprValueKind Cat) { ValueKind = Cat; } 2059 2060 static bool classof(const Stmt *T) { 2061 return T->getStmtClass() == ImplicitCastExprClass; 2062 } 2063 static bool classof(const ImplicitCastExpr *) { return true; } 2064}; 2065 2066/// ExplicitCastExpr - An explicit cast written in the source 2067/// code. 2068/// 2069/// This class is effectively an abstract class, because it provides 2070/// the basic representation of an explicitly-written cast without 2071/// specifying which kind of cast (C cast, functional cast, static 2072/// cast, etc.) was written; specific derived classes represent the 2073/// particular style of cast and its location information. 2074/// 2075/// Unlike implicit casts, explicit cast nodes have two different 2076/// types: the type that was written into the source code, and the 2077/// actual type of the expression as determined by semantic 2078/// analysis. These types may differ slightly. For example, in C++ one 2079/// can cast to a reference type, which indicates that the resulting 2080/// expression will be an lvalue or xvalue. The reference type, however, 2081/// will not be used as the type of the expression. 2082class ExplicitCastExpr : public CastExpr { 2083 /// TInfo - Source type info for the (written) type 2084 /// this expression is casting to. 2085 TypeSourceInfo *TInfo; 2086 2087protected: 2088 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2089 Expr *op, unsigned PathSize, TypeSourceInfo *writtenTy) 2090 : CastExpr(SC, exprTy, kind, op, PathSize), TInfo(writtenTy) {} 2091 2092 /// \brief Construct an empty explicit cast. 2093 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2094 : CastExpr(SC, Shell, PathSize) { } 2095 2096public: 2097 /// getTypeInfoAsWritten - Returns the type source info for the type 2098 /// that this expression is casting to. 2099 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2100 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2101 2102 /// getTypeAsWritten - Returns the type that this expression is 2103 /// casting to, as written in the source code. 2104 QualType getTypeAsWritten() const { return TInfo->getType(); } 2105 2106 static bool classof(const Stmt *T) { 2107 return T->getStmtClass() >= firstExplicitCastExprConstant && 2108 T->getStmtClass() <= lastExplicitCastExprConstant; 2109 } 2110 static bool classof(const ExplicitCastExpr *) { return true; } 2111}; 2112 2113/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2114/// cast in C++ (C++ [expr.cast]), which uses the syntax 2115/// (Type)expr. For example: @c (int)f. 2116class CStyleCastExpr : public ExplicitCastExpr { 2117 SourceLocation LPLoc; // the location of the left paren 2118 SourceLocation RPLoc; // the location of the right paren 2119 2120 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2121 unsigned PathSize, TypeSourceInfo *writtenTy, 2122 SourceLocation l, SourceLocation r) 2123 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, PathSize, 2124 writtenTy), LPLoc(l), RPLoc(r) {} 2125 2126 /// \brief Construct an empty C-style explicit cast. 2127 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2128 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2129 2130public: 2131 static CStyleCastExpr *Create(ASTContext &Context, QualType T, CastKind K, 2132 Expr *Op, const CXXCastPath *BasePath, 2133 TypeSourceInfo *WrittenTy, SourceLocation L, 2134 SourceLocation R); 2135 2136 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2137 2138 SourceLocation getLParenLoc() const { return LPLoc; } 2139 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2140 2141 SourceLocation getRParenLoc() const { return RPLoc; } 2142 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2143 2144 virtual SourceRange getSourceRange() const { 2145 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2146 } 2147 static bool classof(const Stmt *T) { 2148 return T->getStmtClass() == CStyleCastExprClass; 2149 } 2150 static bool classof(const CStyleCastExpr *) { return true; } 2151}; 2152 2153/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2154/// 2155/// This expression node kind describes a builtin binary operation, 2156/// such as "x + y" for integer values "x" and "y". The operands will 2157/// already have been converted to appropriate types (e.g., by 2158/// performing promotions or conversions). 2159/// 2160/// In C++, where operators may be overloaded, a different kind of 2161/// expression node (CXXOperatorCallExpr) is used to express the 2162/// invocation of an overloaded operator with operator syntax. Within 2163/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2164/// used to store an expression "x + y" depends on the subexpressions 2165/// for x and y. If neither x or y is type-dependent, and the "+" 2166/// operator resolves to a built-in operation, BinaryOperator will be 2167/// used to express the computation (x and y may still be 2168/// value-dependent). If either x or y is type-dependent, or if the 2169/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2170/// be used to express the computation. 2171class BinaryOperator : public Expr { 2172public: 2173 typedef BinaryOperatorKind Opcode; 2174 2175private: 2176 unsigned Opc : 6; 2177 SourceLocation OpLoc; 2178 2179 enum { LHS, RHS, END_EXPR }; 2180 Stmt* SubExprs[END_EXPR]; 2181public: 2182 2183 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2184 SourceLocation opLoc) 2185 : Expr(BinaryOperatorClass, ResTy, 2186 lhs->isTypeDependent() || rhs->isTypeDependent(), 2187 lhs->isValueDependent() || rhs->isValueDependent()), 2188 Opc(opc), OpLoc(opLoc) { 2189 SubExprs[LHS] = lhs; 2190 SubExprs[RHS] = rhs; 2191 assert(!isCompoundAssignmentOp() && 2192 "Use ArithAssignBinaryOperator for compound assignments"); 2193 } 2194 2195 /// \brief Construct an empty binary operator. 2196 explicit BinaryOperator(EmptyShell Empty) 2197 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2198 2199 SourceLocation getOperatorLoc() const { return OpLoc; } 2200 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2201 2202 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2203 void setOpcode(Opcode O) { Opc = O; } 2204 2205 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2206 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2207 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2208 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2209 2210 virtual SourceRange getSourceRange() const { 2211 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2212 } 2213 2214 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2215 /// corresponds to, e.g. "<<=". 2216 static const char *getOpcodeStr(Opcode Op); 2217 2218 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2219 2220 /// \brief Retrieve the binary opcode that corresponds to the given 2221 /// overloaded operator. 2222 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2223 2224 /// \brief Retrieve the overloaded operator kind that corresponds to 2225 /// the given binary opcode. 2226 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2227 2228 /// predicates to categorize the respective opcodes. 2229 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2230 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2231 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2232 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2233 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2234 2235 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2236 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2237 2238 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2239 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2240 2241 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2242 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2243 2244 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2245 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2246 2247 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2248 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2249 2250 bool isAssignmentOp() const { return Opc >= BO_Assign && Opc <= BO_OrAssign; } 2251 bool isCompoundAssignmentOp() const { 2252 return Opc > BO_Assign && Opc <= BO_OrAssign; 2253 } 2254 bool isShiftAssignOp() const { 2255 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2256 } 2257 2258 static bool classof(const Stmt *S) { 2259 return S->getStmtClass() >= firstBinaryOperatorConstant && 2260 S->getStmtClass() <= lastBinaryOperatorConstant; 2261 } 2262 static bool classof(const BinaryOperator *) { return true; } 2263 2264 // Iterators 2265 virtual child_iterator child_begin(); 2266 virtual child_iterator child_end(); 2267 2268protected: 2269 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2270 SourceLocation opLoc, bool dead) 2271 : Expr(CompoundAssignOperatorClass, ResTy, 2272 lhs->isTypeDependent() || rhs->isTypeDependent(), 2273 lhs->isValueDependent() || rhs->isValueDependent()), 2274 Opc(opc), OpLoc(opLoc) { 2275 SubExprs[LHS] = lhs; 2276 SubExprs[RHS] = rhs; 2277 } 2278 2279 BinaryOperator(StmtClass SC, EmptyShell Empty) 2280 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2281}; 2282 2283/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2284/// track of the type the operation is performed in. Due to the semantics of 2285/// these operators, the operands are promoted, the aritmetic performed, an 2286/// implicit conversion back to the result type done, then the assignment takes 2287/// place. This captures the intermediate type which the computation is done 2288/// in. 2289class CompoundAssignOperator : public BinaryOperator { 2290 QualType ComputationLHSType; 2291 QualType ComputationResultType; 2292public: 2293 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2294 QualType ResType, QualType CompLHSType, 2295 QualType CompResultType, 2296 SourceLocation OpLoc) 2297 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2298 ComputationLHSType(CompLHSType), 2299 ComputationResultType(CompResultType) { 2300 assert(isCompoundAssignmentOp() && 2301 "Only should be used for compound assignments"); 2302 } 2303 2304 /// \brief Build an empty compound assignment operator expression. 2305 explicit CompoundAssignOperator(EmptyShell Empty) 2306 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2307 2308 // The two computation types are the type the LHS is converted 2309 // to for the computation and the type of the result; the two are 2310 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2311 QualType getComputationLHSType() const { return ComputationLHSType; } 2312 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2313 2314 QualType getComputationResultType() const { return ComputationResultType; } 2315 void setComputationResultType(QualType T) { ComputationResultType = T; } 2316 2317 static bool classof(const CompoundAssignOperator *) { return true; } 2318 static bool classof(const Stmt *S) { 2319 return S->getStmtClass() == CompoundAssignOperatorClass; 2320 } 2321}; 2322 2323/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2324/// GNU "missing LHS" extension is in use. 2325/// 2326class ConditionalOperator : public Expr { 2327 enum { COND, LHS, RHS, END_EXPR }; 2328 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2329 SourceLocation QuestionLoc, ColonLoc; 2330public: 2331 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2332 SourceLocation CLoc, Expr *rhs, QualType t) 2333 : Expr(ConditionalOperatorClass, t, 2334 // FIXME: the type of the conditional operator doesn't 2335 // depend on the type of the conditional, but the standard 2336 // seems to imply that it could. File a bug! 2337 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2338 (cond->isValueDependent() || 2339 (lhs && lhs->isValueDependent()) || 2340 (rhs && rhs->isValueDependent()))), 2341 QuestionLoc(QLoc), 2342 ColonLoc(CLoc) { 2343 SubExprs[COND] = cond; 2344 SubExprs[LHS] = lhs; 2345 SubExprs[RHS] = rhs; 2346 } 2347 2348 /// \brief Build an empty conditional operator. 2349 explicit ConditionalOperator(EmptyShell Empty) 2350 : Expr(ConditionalOperatorClass, Empty) { } 2351 2352 // getCond - Return the expression representing the condition for 2353 // the ?: operator. 2354 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2355 void setCond(Expr *E) { SubExprs[COND] = E; } 2356 2357 // getTrueExpr - Return the subexpression representing the value of the ?: 2358 // expression if the condition evaluates to true. In most cases this value 2359 // will be the same as getLHS() except a GCC extension allows the left 2360 // subexpression to be omitted, and instead of the condition be returned. 2361 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2362 // is only evaluated once. 2363 Expr *getTrueExpr() const { 2364 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2365 } 2366 2367 // getTrueExpr - Return the subexpression representing the value of the ?: 2368 // expression if the condition evaluates to false. This is the same as getRHS. 2369 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2370 2371 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2372 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2373 2374 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2375 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2376 2377 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2378 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2379 2380 SourceLocation getColonLoc() const { return ColonLoc; } 2381 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2382 2383 virtual SourceRange getSourceRange() const { 2384 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2385 } 2386 static bool classof(const Stmt *T) { 2387 return T->getStmtClass() == ConditionalOperatorClass; 2388 } 2389 static bool classof(const ConditionalOperator *) { return true; } 2390 2391 // Iterators 2392 virtual child_iterator child_begin(); 2393 virtual child_iterator child_end(); 2394}; 2395 2396/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2397class AddrLabelExpr : public Expr { 2398 SourceLocation AmpAmpLoc, LabelLoc; 2399 LabelStmt *Label; 2400public: 2401 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2402 QualType t) 2403 : Expr(AddrLabelExprClass, t, false, false), 2404 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2405 2406 /// \brief Build an empty address of a label expression. 2407 explicit AddrLabelExpr(EmptyShell Empty) 2408 : Expr(AddrLabelExprClass, Empty) { } 2409 2410 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2411 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2412 SourceLocation getLabelLoc() const { return LabelLoc; } 2413 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2414 2415 virtual SourceRange getSourceRange() const { 2416 return SourceRange(AmpAmpLoc, LabelLoc); 2417 } 2418 2419 LabelStmt *getLabel() const { return Label; } 2420 void setLabel(LabelStmt *S) { Label = S; } 2421 2422 static bool classof(const Stmt *T) { 2423 return T->getStmtClass() == AddrLabelExprClass; 2424 } 2425 static bool classof(const AddrLabelExpr *) { return true; } 2426 2427 // Iterators 2428 virtual child_iterator child_begin(); 2429 virtual child_iterator child_end(); 2430}; 2431 2432/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2433/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2434/// takes the value of the last subexpression. 2435class StmtExpr : public Expr { 2436 Stmt *SubStmt; 2437 SourceLocation LParenLoc, RParenLoc; 2438public: 2439 // FIXME: Does type-dependence need to be computed differently? 2440 StmtExpr(CompoundStmt *substmt, QualType T, 2441 SourceLocation lp, SourceLocation rp) : 2442 Expr(StmtExprClass, T, T->isDependentType(), false), 2443 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2444 2445 /// \brief Build an empty statement expression. 2446 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2447 2448 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2449 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2450 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2451 2452 virtual SourceRange getSourceRange() const { 2453 return SourceRange(LParenLoc, RParenLoc); 2454 } 2455 2456 SourceLocation getLParenLoc() const { return LParenLoc; } 2457 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2458 SourceLocation getRParenLoc() const { return RParenLoc; } 2459 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2460 2461 static bool classof(const Stmt *T) { 2462 return T->getStmtClass() == StmtExprClass; 2463 } 2464 static bool classof(const StmtExpr *) { return true; } 2465 2466 // Iterators 2467 virtual child_iterator child_begin(); 2468 virtual child_iterator child_end(); 2469}; 2470 2471/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2472/// This AST node represents a function that returns 1 if two *types* (not 2473/// expressions) are compatible. The result of this built-in function can be 2474/// used in integer constant expressions. 2475class TypesCompatibleExpr : public Expr { 2476 TypeSourceInfo *TInfo1; 2477 TypeSourceInfo *TInfo2; 2478 SourceLocation BuiltinLoc, RParenLoc; 2479public: 2480 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2481 TypeSourceInfo *tinfo1, TypeSourceInfo *tinfo2, 2482 SourceLocation RP) : 2483 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2484 TInfo1(tinfo1), TInfo2(tinfo2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2485 2486 /// \brief Build an empty __builtin_type_compatible_p expression. 2487 explicit TypesCompatibleExpr(EmptyShell Empty) 2488 : Expr(TypesCompatibleExprClass, Empty) { } 2489 2490 TypeSourceInfo *getArgTInfo1() const { return TInfo1; } 2491 void setArgTInfo1(TypeSourceInfo *TInfo) { TInfo1 = TInfo; } 2492 TypeSourceInfo *getArgTInfo2() const { return TInfo2; } 2493 void setArgTInfo2(TypeSourceInfo *TInfo) { TInfo2 = TInfo; } 2494 2495 QualType getArgType1() const { return TInfo1->getType(); } 2496 QualType getArgType2() const { return TInfo2->getType(); } 2497 2498 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2499 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2500 2501 SourceLocation getRParenLoc() const { return RParenLoc; } 2502 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2503 2504 virtual SourceRange getSourceRange() const { 2505 return SourceRange(BuiltinLoc, RParenLoc); 2506 } 2507 static bool classof(const Stmt *T) { 2508 return T->getStmtClass() == TypesCompatibleExprClass; 2509 } 2510 static bool classof(const TypesCompatibleExpr *) { return true; } 2511 2512 // Iterators 2513 virtual child_iterator child_begin(); 2514 virtual child_iterator child_end(); 2515}; 2516 2517/// ShuffleVectorExpr - clang-specific builtin-in function 2518/// __builtin_shufflevector. 2519/// This AST node represents a operator that does a constant 2520/// shuffle, similar to LLVM's shufflevector instruction. It takes 2521/// two vectors and a variable number of constant indices, 2522/// and returns the appropriately shuffled vector. 2523class ShuffleVectorExpr : public Expr { 2524 SourceLocation BuiltinLoc, RParenLoc; 2525 2526 // SubExprs - the list of values passed to the __builtin_shufflevector 2527 // function. The first two are vectors, and the rest are constant 2528 // indices. The number of values in this list is always 2529 // 2+the number of indices in the vector type. 2530 Stmt **SubExprs; 2531 unsigned NumExprs; 2532 2533public: 2534 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2535 // to be computed differently? 2536 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2537 QualType Type, SourceLocation BLoc, 2538 SourceLocation RP) : 2539 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2540 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2541 2542 SubExprs = new (C) Stmt*[nexpr]; 2543 for (unsigned i = 0; i < nexpr; i++) 2544 SubExprs[i] = args[i]; 2545 } 2546 2547 /// \brief Build an empty vector-shuffle expression. 2548 explicit ShuffleVectorExpr(EmptyShell Empty) 2549 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2550 2551 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2552 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2553 2554 SourceLocation getRParenLoc() const { return RParenLoc; } 2555 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2556 2557 virtual SourceRange getSourceRange() const { 2558 return SourceRange(BuiltinLoc, RParenLoc); 2559 } 2560 static bool classof(const Stmt *T) { 2561 return T->getStmtClass() == ShuffleVectorExprClass; 2562 } 2563 static bool classof(const ShuffleVectorExpr *) { return true; } 2564 2565 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2566 /// constant expression, the actual arguments passed in, and the function 2567 /// pointers. 2568 unsigned getNumSubExprs() const { return NumExprs; } 2569 2570 /// getExpr - Return the Expr at the specified index. 2571 Expr *getExpr(unsigned Index) { 2572 assert((Index < NumExprs) && "Arg access out of range!"); 2573 return cast<Expr>(SubExprs[Index]); 2574 } 2575 const Expr *getExpr(unsigned Index) const { 2576 assert((Index < NumExprs) && "Arg access out of range!"); 2577 return cast<Expr>(SubExprs[Index]); 2578 } 2579 2580 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2581 2582 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2583 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2584 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2585 } 2586 2587 // Iterators 2588 virtual child_iterator child_begin(); 2589 virtual child_iterator child_end(); 2590}; 2591 2592/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2593/// This AST node is similar to the conditional operator (?:) in C, with 2594/// the following exceptions: 2595/// - the test expression must be a integer constant expression. 2596/// - the expression returned acts like the chosen subexpression in every 2597/// visible way: the type is the same as that of the chosen subexpression, 2598/// and all predicates (whether it's an l-value, whether it's an integer 2599/// constant expression, etc.) return the same result as for the chosen 2600/// sub-expression. 2601class ChooseExpr : public Expr { 2602 enum { COND, LHS, RHS, END_EXPR }; 2603 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2604 SourceLocation BuiltinLoc, RParenLoc; 2605public: 2606 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2607 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2608 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2609 BuiltinLoc(BLoc), RParenLoc(RP) { 2610 SubExprs[COND] = cond; 2611 SubExprs[LHS] = lhs; 2612 SubExprs[RHS] = rhs; 2613 } 2614 2615 /// \brief Build an empty __builtin_choose_expr. 2616 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2617 2618 /// isConditionTrue - Return whether the condition is true (i.e. not 2619 /// equal to zero). 2620 bool isConditionTrue(ASTContext &C) const; 2621 2622 /// getChosenSubExpr - Return the subexpression chosen according to the 2623 /// condition. 2624 Expr *getChosenSubExpr(ASTContext &C) const { 2625 return isConditionTrue(C) ? getLHS() : getRHS(); 2626 } 2627 2628 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2629 void setCond(Expr *E) { SubExprs[COND] = E; } 2630 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2631 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2632 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2633 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2634 2635 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2636 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2637 2638 SourceLocation getRParenLoc() const { return RParenLoc; } 2639 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2640 2641 virtual SourceRange getSourceRange() const { 2642 return SourceRange(BuiltinLoc, RParenLoc); 2643 } 2644 static bool classof(const Stmt *T) { 2645 return T->getStmtClass() == ChooseExprClass; 2646 } 2647 static bool classof(const ChooseExpr *) { return true; } 2648 2649 // Iterators 2650 virtual child_iterator child_begin(); 2651 virtual child_iterator child_end(); 2652}; 2653 2654/// GNUNullExpr - Implements the GNU __null extension, which is a name 2655/// for a null pointer constant that has integral type (e.g., int or 2656/// long) and is the same size and alignment as a pointer. The __null 2657/// extension is typically only used by system headers, which define 2658/// NULL as __null in C++ rather than using 0 (which is an integer 2659/// that may not match the size of a pointer). 2660class GNUNullExpr : public Expr { 2661 /// TokenLoc - The location of the __null keyword. 2662 SourceLocation TokenLoc; 2663 2664public: 2665 GNUNullExpr(QualType Ty, SourceLocation Loc) 2666 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2667 2668 /// \brief Build an empty GNU __null expression. 2669 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2670 2671 /// getTokenLocation - The location of the __null token. 2672 SourceLocation getTokenLocation() const { return TokenLoc; } 2673 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2674 2675 virtual SourceRange getSourceRange() const { 2676 return SourceRange(TokenLoc); 2677 } 2678 static bool classof(const Stmt *T) { 2679 return T->getStmtClass() == GNUNullExprClass; 2680 } 2681 static bool classof(const GNUNullExpr *) { return true; } 2682 2683 // Iterators 2684 virtual child_iterator child_begin(); 2685 virtual child_iterator child_end(); 2686}; 2687 2688/// VAArgExpr, used for the builtin function __builtin_va_arg. 2689class VAArgExpr : public Expr { 2690 Stmt *Val; 2691 TypeSourceInfo *TInfo; 2692 SourceLocation BuiltinLoc, RParenLoc; 2693public: 2694 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2695 SourceLocation RPLoc, QualType t) 2696 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2697 Val(e), TInfo(TInfo), 2698 BuiltinLoc(BLoc), 2699 RParenLoc(RPLoc) { } 2700 2701 /// \brief Create an empty __builtin_va_arg expression. 2702 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2703 2704 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2705 Expr *getSubExpr() { return cast<Expr>(Val); } 2706 void setSubExpr(Expr *E) { Val = E; } 2707 2708 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2709 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2710 2711 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2712 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2713 2714 SourceLocation getRParenLoc() const { return RParenLoc; } 2715 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2716 2717 virtual SourceRange getSourceRange() const { 2718 return SourceRange(BuiltinLoc, RParenLoc); 2719 } 2720 static bool classof(const Stmt *T) { 2721 return T->getStmtClass() == VAArgExprClass; 2722 } 2723 static bool classof(const VAArgExpr *) { return true; } 2724 2725 // Iterators 2726 virtual child_iterator child_begin(); 2727 virtual child_iterator child_end(); 2728}; 2729 2730/// @brief Describes an C or C++ initializer list. 2731/// 2732/// InitListExpr describes an initializer list, which can be used to 2733/// initialize objects of different types, including 2734/// struct/class/union types, arrays, and vectors. For example: 2735/// 2736/// @code 2737/// struct foo x = { 1, { 2, 3 } }; 2738/// @endcode 2739/// 2740/// Prior to semantic analysis, an initializer list will represent the 2741/// initializer list as written by the user, but will have the 2742/// placeholder type "void". This initializer list is called the 2743/// syntactic form of the initializer, and may contain C99 designated 2744/// initializers (represented as DesignatedInitExprs), initializations 2745/// of subobject members without explicit braces, and so on. Clients 2746/// interested in the original syntax of the initializer list should 2747/// use the syntactic form of the initializer list. 2748/// 2749/// After semantic analysis, the initializer list will represent the 2750/// semantic form of the initializer, where the initializations of all 2751/// subobjects are made explicit with nested InitListExpr nodes and 2752/// C99 designators have been eliminated by placing the designated 2753/// initializations into the subobject they initialize. Additionally, 2754/// any "holes" in the initialization, where no initializer has been 2755/// specified for a particular subobject, will be replaced with 2756/// implicitly-generated ImplicitValueInitExpr expressions that 2757/// value-initialize the subobjects. Note, however, that the 2758/// initializer lists may still have fewer initializers than there are 2759/// elements to initialize within the object. 2760/// 2761/// Given the semantic form of the initializer list, one can retrieve 2762/// the original syntactic form of that initializer list (if it 2763/// exists) using getSyntacticForm(). Since many initializer lists 2764/// have the same syntactic and semantic forms, getSyntacticForm() may 2765/// return NULL, indicating that the current initializer list also 2766/// serves as its syntactic form. 2767class InitListExpr : public Expr { 2768 // FIXME: Eliminate this vector in favor of ASTContext allocation 2769 typedef ASTVector<Stmt *> InitExprsTy; 2770 InitExprsTy InitExprs; 2771 SourceLocation LBraceLoc, RBraceLoc; 2772 2773 /// Contains the initializer list that describes the syntactic form 2774 /// written in the source code. 2775 InitListExpr *SyntacticForm; 2776 2777 /// If this initializer list initializes a union, specifies which 2778 /// field within the union will be initialized. 2779 FieldDecl *UnionFieldInit; 2780 2781 /// Whether this initializer list originally had a GNU array-range 2782 /// designator in it. This is a temporary marker used by CodeGen. 2783 bool HadArrayRangeDesignator; 2784 2785public: 2786 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2787 Expr **initexprs, unsigned numinits, 2788 SourceLocation rbraceloc); 2789 2790 /// \brief Build an empty initializer list. 2791 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2792 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2793 2794 unsigned getNumInits() const { return InitExprs.size(); } 2795 2796 const Expr* getInit(unsigned Init) const { 2797 assert(Init < getNumInits() && "Initializer access out of range!"); 2798 return cast_or_null<Expr>(InitExprs[Init]); 2799 } 2800 2801 Expr* getInit(unsigned Init) { 2802 assert(Init < getNumInits() && "Initializer access out of range!"); 2803 return cast_or_null<Expr>(InitExprs[Init]); 2804 } 2805 2806 void setInit(unsigned Init, Expr *expr) { 2807 assert(Init < getNumInits() && "Initializer access out of range!"); 2808 InitExprs[Init] = expr; 2809 } 2810 2811 /// \brief Reserve space for some number of initializers. 2812 void reserveInits(ASTContext &C, unsigned NumInits); 2813 2814 /// @brief Specify the number of initializers 2815 /// 2816 /// If there are more than @p NumInits initializers, the remaining 2817 /// initializers will be destroyed. If there are fewer than @p 2818 /// NumInits initializers, NULL expressions will be added for the 2819 /// unknown initializers. 2820 void resizeInits(ASTContext &Context, unsigned NumInits); 2821 2822 /// @brief Updates the initializer at index @p Init with the new 2823 /// expression @p expr, and returns the old expression at that 2824 /// location. 2825 /// 2826 /// When @p Init is out of range for this initializer list, the 2827 /// initializer list will be extended with NULL expressions to 2828 /// accomodate the new entry. 2829 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2830 2831 /// \brief If this initializes a union, specifies which field in the 2832 /// union to initialize. 2833 /// 2834 /// Typically, this field is the first named field within the 2835 /// union. However, a designated initializer can specify the 2836 /// initialization of a different field within the union. 2837 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2838 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2839 2840 // Explicit InitListExpr's originate from source code (and have valid source 2841 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2842 bool isExplicit() { 2843 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2844 } 2845 2846 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2847 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2848 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2849 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2850 2851 /// @brief Retrieve the initializer list that describes the 2852 /// syntactic form of the initializer. 2853 /// 2854 /// 2855 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2856 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2857 2858 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2859 void sawArrayRangeDesignator(bool ARD = true) { 2860 HadArrayRangeDesignator = ARD; 2861 } 2862 2863 virtual SourceRange getSourceRange() const { 2864 return SourceRange(LBraceLoc, RBraceLoc); 2865 } 2866 static bool classof(const Stmt *T) { 2867 return T->getStmtClass() == InitListExprClass; 2868 } 2869 static bool classof(const InitListExpr *) { return true; } 2870 2871 // Iterators 2872 virtual child_iterator child_begin(); 2873 virtual child_iterator child_end(); 2874 2875 typedef InitExprsTy::iterator iterator; 2876 typedef InitExprsTy::const_iterator const_iterator; 2877 typedef InitExprsTy::reverse_iterator reverse_iterator; 2878 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 2879 2880 iterator begin() { return InitExprs.begin(); } 2881 const_iterator begin() const { return InitExprs.begin(); } 2882 iterator end() { return InitExprs.end(); } 2883 const_iterator end() const { return InitExprs.end(); } 2884 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2885 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 2886 reverse_iterator rend() { return InitExprs.rend(); } 2887 const_reverse_iterator rend() const { return InitExprs.rend(); } 2888}; 2889 2890/// @brief Represents a C99 designated initializer expression. 2891/// 2892/// A designated initializer expression (C99 6.7.8) contains one or 2893/// more designators (which can be field designators, array 2894/// designators, or GNU array-range designators) followed by an 2895/// expression that initializes the field or element(s) that the 2896/// designators refer to. For example, given: 2897/// 2898/// @code 2899/// struct point { 2900/// double x; 2901/// double y; 2902/// }; 2903/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2904/// @endcode 2905/// 2906/// The InitListExpr contains three DesignatedInitExprs, the first of 2907/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2908/// designators, one array designator for @c [2] followed by one field 2909/// designator for @c .y. The initalization expression will be 1.0. 2910class DesignatedInitExpr : public Expr { 2911public: 2912 /// \brief Forward declaration of the Designator class. 2913 class Designator; 2914 2915private: 2916 /// The location of the '=' or ':' prior to the actual initializer 2917 /// expression. 2918 SourceLocation EqualOrColonLoc; 2919 2920 /// Whether this designated initializer used the GNU deprecated 2921 /// syntax rather than the C99 '=' syntax. 2922 bool GNUSyntax : 1; 2923 2924 /// The number of designators in this initializer expression. 2925 unsigned NumDesignators : 15; 2926 2927 /// \brief The designators in this designated initialization 2928 /// expression. 2929 Designator *Designators; 2930 2931 /// The number of subexpressions of this initializer expression, 2932 /// which contains both the initializer and any additional 2933 /// expressions used by array and array-range designators. 2934 unsigned NumSubExprs : 16; 2935 2936 2937 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2938 const Designator *Designators, 2939 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2940 Expr **IndexExprs, unsigned NumIndexExprs, 2941 Expr *Init); 2942 2943 explicit DesignatedInitExpr(unsigned NumSubExprs) 2944 : Expr(DesignatedInitExprClass, EmptyShell()), 2945 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2946 2947public: 2948 /// A field designator, e.g., ".x". 2949 struct FieldDesignator { 2950 /// Refers to the field that is being initialized. The low bit 2951 /// of this field determines whether this is actually a pointer 2952 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2953 /// initially constructed, a field designator will store an 2954 /// IdentifierInfo*. After semantic analysis has resolved that 2955 /// name, the field designator will instead store a FieldDecl*. 2956 uintptr_t NameOrField; 2957 2958 /// The location of the '.' in the designated initializer. 2959 unsigned DotLoc; 2960 2961 /// The location of the field name in the designated initializer. 2962 unsigned FieldLoc; 2963 }; 2964 2965 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2966 struct ArrayOrRangeDesignator { 2967 /// Location of the first index expression within the designated 2968 /// initializer expression's list of subexpressions. 2969 unsigned Index; 2970 /// The location of the '[' starting the array range designator. 2971 unsigned LBracketLoc; 2972 /// The location of the ellipsis separating the start and end 2973 /// indices. Only valid for GNU array-range designators. 2974 unsigned EllipsisLoc; 2975 /// The location of the ']' terminating the array range designator. 2976 unsigned RBracketLoc; 2977 }; 2978 2979 /// @brief Represents a single C99 designator. 2980 /// 2981 /// @todo This class is infuriatingly similar to clang::Designator, 2982 /// but minor differences (storing indices vs. storing pointers) 2983 /// keep us from reusing it. Try harder, later, to rectify these 2984 /// differences. 2985 class Designator { 2986 /// @brief The kind of designator this describes. 2987 enum { 2988 FieldDesignator, 2989 ArrayDesignator, 2990 ArrayRangeDesignator 2991 } Kind; 2992 2993 union { 2994 /// A field designator, e.g., ".x". 2995 struct FieldDesignator Field; 2996 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2997 struct ArrayOrRangeDesignator ArrayOrRange; 2998 }; 2999 friend class DesignatedInitExpr; 3000 3001 public: 3002 Designator() {} 3003 3004 /// @brief Initializes a field designator. 3005 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3006 SourceLocation FieldLoc) 3007 : Kind(FieldDesignator) { 3008 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3009 Field.DotLoc = DotLoc.getRawEncoding(); 3010 Field.FieldLoc = FieldLoc.getRawEncoding(); 3011 } 3012 3013 /// @brief Initializes an array designator. 3014 Designator(unsigned Index, SourceLocation LBracketLoc, 3015 SourceLocation RBracketLoc) 3016 : Kind(ArrayDesignator) { 3017 ArrayOrRange.Index = Index; 3018 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3019 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3020 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3021 } 3022 3023 /// @brief Initializes a GNU array-range designator. 3024 Designator(unsigned Index, SourceLocation LBracketLoc, 3025 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3026 : Kind(ArrayRangeDesignator) { 3027 ArrayOrRange.Index = Index; 3028 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3029 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3030 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3031 } 3032 3033 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3034 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3035 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3036 3037 IdentifierInfo * getFieldName(); 3038 3039 FieldDecl *getField() { 3040 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3041 if (Field.NameOrField & 0x01) 3042 return 0; 3043 else 3044 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3045 } 3046 3047 void setField(FieldDecl *FD) { 3048 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3049 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3050 } 3051 3052 SourceLocation getDotLoc() const { 3053 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3054 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3055 } 3056 3057 SourceLocation getFieldLoc() const { 3058 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3059 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3060 } 3061 3062 SourceLocation getLBracketLoc() const { 3063 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3064 "Only valid on an array or array-range designator"); 3065 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3066 } 3067 3068 SourceLocation getRBracketLoc() const { 3069 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3070 "Only valid on an array or array-range designator"); 3071 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3072 } 3073 3074 SourceLocation getEllipsisLoc() const { 3075 assert(Kind == ArrayRangeDesignator && 3076 "Only valid on an array-range designator"); 3077 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3078 } 3079 3080 unsigned getFirstExprIndex() const { 3081 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3082 "Only valid on an array or array-range designator"); 3083 return ArrayOrRange.Index; 3084 } 3085 3086 SourceLocation getStartLocation() const { 3087 if (Kind == FieldDesignator) 3088 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3089 else 3090 return getLBracketLoc(); 3091 } 3092 }; 3093 3094 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3095 unsigned NumDesignators, 3096 Expr **IndexExprs, unsigned NumIndexExprs, 3097 SourceLocation EqualOrColonLoc, 3098 bool GNUSyntax, Expr *Init); 3099 3100 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3101 3102 /// @brief Returns the number of designators in this initializer. 3103 unsigned size() const { return NumDesignators; } 3104 3105 // Iterator access to the designators. 3106 typedef Designator* designators_iterator; 3107 designators_iterator designators_begin() { return Designators; } 3108 designators_iterator designators_end() { 3109 return Designators + NumDesignators; 3110 } 3111 3112 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3113 3114 void setDesignators(ASTContext &C, const Designator *Desigs, 3115 unsigned NumDesigs); 3116 3117 Expr *getArrayIndex(const Designator& D); 3118 Expr *getArrayRangeStart(const Designator& D); 3119 Expr *getArrayRangeEnd(const Designator& D); 3120 3121 /// @brief Retrieve the location of the '=' that precedes the 3122 /// initializer value itself, if present. 3123 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3124 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3125 3126 /// @brief Determines whether this designated initializer used the 3127 /// deprecated GNU syntax for designated initializers. 3128 bool usesGNUSyntax() const { return GNUSyntax; } 3129 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3130 3131 /// @brief Retrieve the initializer value. 3132 Expr *getInit() const { 3133 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3134 } 3135 3136 void setInit(Expr *init) { 3137 *child_begin() = init; 3138 } 3139 3140 /// \brief Retrieve the total number of subexpressions in this 3141 /// designated initializer expression, including the actual 3142 /// initialized value and any expressions that occur within array 3143 /// and array-range designators. 3144 unsigned getNumSubExprs() const { return NumSubExprs; } 3145 3146 Expr *getSubExpr(unsigned Idx) { 3147 assert(Idx < NumSubExprs && "Subscript out of range"); 3148 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3149 Ptr += sizeof(DesignatedInitExpr); 3150 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3151 } 3152 3153 void setSubExpr(unsigned Idx, Expr *E) { 3154 assert(Idx < NumSubExprs && "Subscript out of range"); 3155 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3156 Ptr += sizeof(DesignatedInitExpr); 3157 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3158 } 3159 3160 /// \brief Replaces the designator at index @p Idx with the series 3161 /// of designators in [First, Last). 3162 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3163 const Designator *Last); 3164 3165 virtual SourceRange getSourceRange() const; 3166 3167 static bool classof(const Stmt *T) { 3168 return T->getStmtClass() == DesignatedInitExprClass; 3169 } 3170 static bool classof(const DesignatedInitExpr *) { return true; } 3171 3172 // Iterators 3173 virtual child_iterator child_begin(); 3174 virtual child_iterator child_end(); 3175}; 3176 3177/// \brief Represents an implicitly-generated value initialization of 3178/// an object of a given type. 3179/// 3180/// Implicit value initializations occur within semantic initializer 3181/// list expressions (InitListExpr) as placeholders for subobject 3182/// initializations not explicitly specified by the user. 3183/// 3184/// \see InitListExpr 3185class ImplicitValueInitExpr : public Expr { 3186public: 3187 explicit ImplicitValueInitExpr(QualType ty) 3188 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3189 3190 /// \brief Construct an empty implicit value initialization. 3191 explicit ImplicitValueInitExpr(EmptyShell Empty) 3192 : Expr(ImplicitValueInitExprClass, Empty) { } 3193 3194 static bool classof(const Stmt *T) { 3195 return T->getStmtClass() == ImplicitValueInitExprClass; 3196 } 3197 static bool classof(const ImplicitValueInitExpr *) { return true; } 3198 3199 virtual SourceRange getSourceRange() const { 3200 return SourceRange(); 3201 } 3202 3203 // Iterators 3204 virtual child_iterator child_begin(); 3205 virtual child_iterator child_end(); 3206}; 3207 3208 3209class ParenListExpr : public Expr { 3210 Stmt **Exprs; 3211 unsigned NumExprs; 3212 SourceLocation LParenLoc, RParenLoc; 3213 3214public: 3215 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3216 unsigned numexprs, SourceLocation rparenloc); 3217 3218 /// \brief Build an empty paren list. 3219 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3220 3221 unsigned getNumExprs() const { return NumExprs; } 3222 3223 const Expr* getExpr(unsigned Init) const { 3224 assert(Init < getNumExprs() && "Initializer access out of range!"); 3225 return cast_or_null<Expr>(Exprs[Init]); 3226 } 3227 3228 Expr* getExpr(unsigned Init) { 3229 assert(Init < getNumExprs() && "Initializer access out of range!"); 3230 return cast_or_null<Expr>(Exprs[Init]); 3231 } 3232 3233 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3234 3235 SourceLocation getLParenLoc() const { return LParenLoc; } 3236 SourceLocation getRParenLoc() const { return RParenLoc; } 3237 3238 virtual SourceRange getSourceRange() const { 3239 return SourceRange(LParenLoc, RParenLoc); 3240 } 3241 static bool classof(const Stmt *T) { 3242 return T->getStmtClass() == ParenListExprClass; 3243 } 3244 static bool classof(const ParenListExpr *) { return true; } 3245 3246 // Iterators 3247 virtual child_iterator child_begin(); 3248 virtual child_iterator child_end(); 3249 3250 friend class ASTStmtReader; 3251 friend class ASTStmtWriter; 3252}; 3253 3254 3255//===----------------------------------------------------------------------===// 3256// Clang Extensions 3257//===----------------------------------------------------------------------===// 3258 3259 3260/// ExtVectorElementExpr - This represents access to specific elements of a 3261/// vector, and may occur on the left hand side or right hand side. For example 3262/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3263/// 3264/// Note that the base may have either vector or pointer to vector type, just 3265/// like a struct field reference. 3266/// 3267class ExtVectorElementExpr : public Expr { 3268 Stmt *Base; 3269 IdentifierInfo *Accessor; 3270 SourceLocation AccessorLoc; 3271public: 3272 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3273 SourceLocation loc) 3274 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3275 base->isValueDependent()), 3276 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3277 3278 /// \brief Build an empty vector element expression. 3279 explicit ExtVectorElementExpr(EmptyShell Empty) 3280 : Expr(ExtVectorElementExprClass, Empty) { } 3281 3282 const Expr *getBase() const { return cast<Expr>(Base); } 3283 Expr *getBase() { return cast<Expr>(Base); } 3284 void setBase(Expr *E) { Base = E; } 3285 3286 IdentifierInfo &getAccessor() const { return *Accessor; } 3287 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3288 3289 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3290 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3291 3292 /// getNumElements - Get the number of components being selected. 3293 unsigned getNumElements() const; 3294 3295 /// containsDuplicateElements - Return true if any element access is 3296 /// repeated. 3297 bool containsDuplicateElements() const; 3298 3299 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3300 /// aggregate Constant of ConstantInt(s). 3301 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3302 3303 virtual SourceRange getSourceRange() const { 3304 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3305 } 3306 3307 /// isArrow - Return true if the base expression is a pointer to vector, 3308 /// return false if the base expression is a vector. 3309 bool isArrow() const; 3310 3311 static bool classof(const Stmt *T) { 3312 return T->getStmtClass() == ExtVectorElementExprClass; 3313 } 3314 static bool classof(const ExtVectorElementExpr *) { return true; } 3315 3316 // Iterators 3317 virtual child_iterator child_begin(); 3318 virtual child_iterator child_end(); 3319}; 3320 3321 3322/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3323/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3324class BlockExpr : public Expr { 3325protected: 3326 BlockDecl *TheBlock; 3327 bool HasBlockDeclRefExprs; 3328public: 3329 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3330 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3331 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3332 3333 /// \brief Build an empty block expression. 3334 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3335 3336 const BlockDecl *getBlockDecl() const { return TheBlock; } 3337 BlockDecl *getBlockDecl() { return TheBlock; } 3338 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3339 3340 // Convenience functions for probing the underlying BlockDecl. 3341 SourceLocation getCaretLocation() const; 3342 const Stmt *getBody() const; 3343 Stmt *getBody(); 3344 3345 virtual SourceRange getSourceRange() const { 3346 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3347 } 3348 3349 /// getFunctionType - Return the underlying function type for this block. 3350 const FunctionType *getFunctionType() const; 3351 3352 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3353 /// inside of the block that reference values outside the block. 3354 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3355 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3356 3357 static bool classof(const Stmt *T) { 3358 return T->getStmtClass() == BlockExprClass; 3359 } 3360 static bool classof(const BlockExpr *) { return true; } 3361 3362 // Iterators 3363 virtual child_iterator child_begin(); 3364 virtual child_iterator child_end(); 3365}; 3366 3367/// BlockDeclRefExpr - A reference to a declared variable, function, 3368/// enum, etc. 3369class BlockDeclRefExpr : public Expr { 3370 ValueDecl *D; 3371 SourceLocation Loc; 3372 bool IsByRef : 1; 3373 bool ConstQualAdded : 1; 3374 Stmt *CopyConstructorVal; 3375public: 3376 // FIXME: Fix type/value dependence! 3377 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3378 bool constAdded = false, 3379 Stmt *copyConstructorVal = 0) 3380 : Expr(BlockDeclRefExprClass, t, (!t.isNull() && t->isDependentType()),false), 3381 D(d), Loc(l), IsByRef(ByRef), 3382 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3383 3384 // \brief Build an empty reference to a declared variable in a 3385 // block. 3386 explicit BlockDeclRefExpr(EmptyShell Empty) 3387 : Expr(BlockDeclRefExprClass, Empty) { } 3388 3389 ValueDecl *getDecl() { return D; } 3390 const ValueDecl *getDecl() const { return D; } 3391 void setDecl(ValueDecl *VD) { D = VD; } 3392 3393 SourceLocation getLocation() const { return Loc; } 3394 void setLocation(SourceLocation L) { Loc = L; } 3395 3396 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3397 3398 bool isByRef() const { return IsByRef; } 3399 void setByRef(bool BR) { IsByRef = BR; } 3400 3401 bool isConstQualAdded() const { return ConstQualAdded; } 3402 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3403 3404 const Expr *getCopyConstructorExpr() const 3405 { return cast_or_null<Expr>(CopyConstructorVal); } 3406 Expr *getCopyConstructorExpr() 3407 { return cast_or_null<Expr>(CopyConstructorVal); } 3408 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3409 3410 static bool classof(const Stmt *T) { 3411 return T->getStmtClass() == BlockDeclRefExprClass; 3412 } 3413 static bool classof(const BlockDeclRefExpr *) { return true; } 3414 3415 // Iterators 3416 virtual child_iterator child_begin(); 3417 virtual child_iterator child_end(); 3418}; 3419 3420} // end namespace clang 3421 3422#endif 3423