Expr.h revision bef0efd11bc4430a3ee437a3213cec5c18af855a
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/ASTVector.h" 22#include "clang/AST/UsuallyTinyPtrVector.h" 23#include "llvm/ADT/APSInt.h" 24#include "llvm/ADT/APFloat.h" 25#include "llvm/ADT/SmallVector.h" 26#include "llvm/ADT/StringRef.h" 27#include <vector> 28 29namespace clang { 30 class ASTContext; 31 class APValue; 32 class Decl; 33 class IdentifierInfo; 34 class ParmVarDecl; 35 class NamedDecl; 36 class ValueDecl; 37 class BlockDecl; 38 class CXXBaseSpecifier; 39 class CXXOperatorCallExpr; 40 class CXXMemberCallExpr; 41 class TemplateArgumentLoc; 42 class TemplateArgumentListInfo; 43 44/// \brief A simple array of base specifiers. 45typedef UsuallyTinyPtrVector<const CXXBaseSpecifier> CXXBaseSpecifierArray; 46 47/// Expr - This represents one expression. Note that Expr's are subclasses of 48/// Stmt. This allows an expression to be transparently used any place a Stmt 49/// is required. 50/// 51class Expr : public Stmt { 52 QualType TR; 53 54 virtual void ANCHOR(); // key function. 55protected: 56 /// TypeDependent - Whether this expression is type-dependent 57 /// (C++ [temp.dep.expr]). 58 bool TypeDependent : 1; 59 60 /// ValueDependent - Whether this expression is value-dependent 61 /// (C++ [temp.dep.constexpr]). 62 bool ValueDependent : 1; 63 64 Expr(StmtClass SC, QualType T, bool TD, bool VD) 65 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 66 setType(T); 67 } 68 69 /// \brief Construct an empty expression. 70 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 71 72public: 73 /// \brief Increases the reference count for this expression. 74 /// 75 /// Invoke the Retain() operation when this expression 76 /// is being shared by another owner. 77 Expr *Retain() { 78 Stmt::Retain(); 79 return this; 80 } 81 82 QualType getType() const { return TR; } 83 void setType(QualType t) { 84 // In C++, the type of an expression is always adjusted so that it 85 // will not have reference type an expression will never have 86 // reference type (C++ [expr]p6). Use 87 // QualType::getNonReferenceType() to retrieve the non-reference 88 // type. Additionally, inspect Expr::isLvalue to determine whether 89 // an expression that is adjusted in this manner should be 90 // considered an lvalue. 91 assert((t.isNull() || !t->isReferenceType()) && 92 "Expressions can't have reference type"); 93 94 TR = t; 95 } 96 97 /// isValueDependent - Determines whether this expression is 98 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 99 /// array bound of "Chars" in the following example is 100 /// value-dependent. 101 /// @code 102 /// template<int Size, char (&Chars)[Size]> struct meta_string; 103 /// @endcode 104 bool isValueDependent() const { return ValueDependent; } 105 106 /// \brief Set whether this expression is value-dependent or not. 107 void setValueDependent(bool VD) { ValueDependent = VD; } 108 109 /// isTypeDependent - Determines whether this expression is 110 /// type-dependent (C++ [temp.dep.expr]), which means that its type 111 /// could change from one template instantiation to the next. For 112 /// example, the expressions "x" and "x + y" are type-dependent in 113 /// the following code, but "y" is not type-dependent: 114 /// @code 115 /// template<typename T> 116 /// void add(T x, int y) { 117 /// x + y; 118 /// } 119 /// @endcode 120 bool isTypeDependent() const { return TypeDependent; } 121 122 /// \brief Set whether this expression is type-dependent or not. 123 void setTypeDependent(bool TD) { TypeDependent = TD; } 124 125 /// SourceLocation tokens are not useful in isolation - they are low level 126 /// value objects created/interpreted by SourceManager. We assume AST 127 /// clients will have a pointer to the respective SourceManager. 128 virtual SourceRange getSourceRange() const = 0; 129 130 /// getExprLoc - Return the preferred location for the arrow when diagnosing 131 /// a problem with a generic expression. 132 virtual SourceLocation getExprLoc() const { return getLocStart(); } 133 134 /// isUnusedResultAWarning - Return true if this immediate expression should 135 /// be warned about if the result is unused. If so, fill in Loc and Ranges 136 /// with location to warn on and the source range[s] to report with the 137 /// warning. 138 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 139 SourceRange &R2, ASTContext &Ctx) const; 140 141 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 142 /// incomplete type other than void. Nonarray expressions that can be lvalues: 143 /// - name, where name must be a variable 144 /// - e[i] 145 /// - (e), where e must be an lvalue 146 /// - e.name, where e must be an lvalue 147 /// - e->name 148 /// - *e, the type of e cannot be a function type 149 /// - string-constant 150 /// - reference type [C++ [expr]] 151 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 152 /// 153 enum isLvalueResult { 154 LV_Valid, 155 LV_NotObjectType, 156 LV_IncompleteVoidType, 157 LV_DuplicateVectorComponents, 158 LV_InvalidExpression, 159 LV_MemberFunction, 160 LV_SubObjCPropertySetting, 161 LV_ClassTemporary 162 }; 163 isLvalueResult isLvalue(ASTContext &Ctx) const; 164 165 // Same as above, but excluding checks for non-object and void types in C 166 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 167 168 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 169 /// does not have an incomplete type, does not have a const-qualified type, 170 /// and if it is a structure or union, does not have any member (including, 171 /// recursively, any member or element of all contained aggregates or unions) 172 /// with a const-qualified type. 173 /// 174 /// \param Loc [in] [out] - A source location which *may* be filled 175 /// in with the location of the expression making this a 176 /// non-modifiable lvalue, if specified. 177 enum isModifiableLvalueResult { 178 MLV_Valid, 179 MLV_NotObjectType, 180 MLV_IncompleteVoidType, 181 MLV_DuplicateVectorComponents, 182 MLV_InvalidExpression, 183 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 184 MLV_IncompleteType, 185 MLV_ConstQualified, 186 MLV_ArrayType, 187 MLV_NotBlockQualified, 188 MLV_ReadonlyProperty, 189 MLV_NoSetterProperty, 190 MLV_MemberFunction, 191 MLV_SubObjCPropertySetting, 192 MLV_ClassTemporary 193 }; 194 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 195 SourceLocation *Loc = 0) const; 196 197 /// \brief If this expression refers to a bit-field, retrieve the 198 /// declaration of that bit-field. 199 FieldDecl *getBitField(); 200 201 const FieldDecl *getBitField() const { 202 return const_cast<Expr*>(this)->getBitField(); 203 } 204 205 /// \brief Returns whether this expression refers to a vector element. 206 bool refersToVectorElement() const; 207 208 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 209 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 210 /// but also int expressions which are produced by things like comparisons in 211 /// C. 212 bool isKnownToHaveBooleanValue() const; 213 214 /// isIntegerConstantExpr - Return true if this expression is a valid integer 215 /// constant expression, and, if so, return its value in Result. If not a 216 /// valid i-c-e, return false and fill in Loc (if specified) with the location 217 /// of the invalid expression. 218 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 219 SourceLocation *Loc = 0, 220 bool isEvaluated = true) const; 221 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 222 llvm::APSInt X; 223 return isIntegerConstantExpr(X, Ctx, Loc); 224 } 225 /// isConstantInitializer - Returns true if this expression is a constant 226 /// initializer, which can be emitted at compile-time. 227 bool isConstantInitializer(ASTContext &Ctx) const; 228 229 /// EvalResult is a struct with detailed info about an evaluated expression. 230 struct EvalResult { 231 /// Val - This is the value the expression can be folded to. 232 APValue Val; 233 234 /// HasSideEffects - Whether the evaluated expression has side effects. 235 /// For example, (f() && 0) can be folded, but it still has side effects. 236 bool HasSideEffects; 237 238 /// Diag - If the expression is unfoldable, then Diag contains a note 239 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 240 /// position for the error, and DiagExpr is the expression that caused 241 /// the error. 242 /// If the expression is foldable, but not an integer constant expression, 243 /// Diag contains a note diagnostic that describes why it isn't an integer 244 /// constant expression. If the expression *is* an integer constant 245 /// expression, then Diag will be zero. 246 unsigned Diag; 247 const Expr *DiagExpr; 248 SourceLocation DiagLoc; 249 250 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 251 }; 252 253 /// Evaluate - Return true if this is a constant which we can fold using 254 /// any crazy technique (that has nothing to do with language standards) that 255 /// we want to. If this function returns true, it returns the folded constant 256 /// in Result. 257 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 258 259 /// EvaluateAsBooleanCondition - Return true if this is a constant 260 /// which we we can fold and convert to a boolean condition using 261 /// any crazy technique that we want to. 262 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 263 264 /// isEvaluatable - Call Evaluate to see if this expression can be constant 265 /// folded, but discard the result. 266 bool isEvaluatable(ASTContext &Ctx) const; 267 268 /// HasSideEffects - This routine returns true for all those expressions 269 /// which must be evaluated each time and must not be optimization away 270 /// or evaluated at compile time. Example is a function call, volatile 271 /// variable read. 272 bool HasSideEffects(ASTContext &Ctx) const; 273 274 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 275 /// must be called on an expression that constant folds to an integer. 276 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 277 278 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 279 /// with link time known address. 280 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 281 282 /// \brief Enumeration used to describe how \c isNullPointerConstant() 283 /// should cope with value-dependent expressions. 284 enum NullPointerConstantValueDependence { 285 /// \brief Specifies that the expression should never be value-dependent. 286 NPC_NeverValueDependent = 0, 287 288 /// \brief Specifies that a value-dependent expression of integral or 289 /// dependent type should be considered a null pointer constant. 290 NPC_ValueDependentIsNull, 291 292 /// \brief Specifies that a value-dependent expression should be considered 293 /// to never be a null pointer constant. 294 NPC_ValueDependentIsNotNull 295 }; 296 297 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 298 /// integer constant expression with the value zero, or if this is one that is 299 /// cast to void*. 300 bool isNullPointerConstant(ASTContext &Ctx, 301 NullPointerConstantValueDependence NPC) const; 302 303 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 304 /// write barrier. 305 bool isOBJCGCCandidate(ASTContext &Ctx) const; 306 307 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 308 /// its subexpression. If that subexpression is also a ParenExpr, 309 /// then this method recursively returns its subexpression, and so forth. 310 /// Otherwise, the method returns the current Expr. 311 Expr *IgnoreParens(); 312 313 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 314 /// or CastExprs, returning their operand. 315 Expr *IgnoreParenCasts(); 316 317 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 318 /// ParenExpr or ImplicitCastExprs, returning their operand. 319 Expr *IgnoreParenImpCasts(); 320 321 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 322 /// value (including ptr->int casts of the same size). Strip off any 323 /// ParenExpr or CastExprs, returning their operand. 324 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 325 326 /// \brief Determine whether this expression is a default function argument. 327 /// 328 /// Default arguments are implicitly generated in the abstract syntax tree 329 /// by semantic analysis for function calls, object constructions, etc. in 330 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 331 /// this routine also looks through any implicit casts to determine whether 332 /// the expression is a default argument. 333 bool isDefaultArgument() const; 334 335 /// \brief Determine whether this expression directly creates a 336 /// temporary object (of class type). 337 bool isTemporaryObject() const { return getTemporaryObject() != 0; } 338 339 /// \brief If this expression directly creates a temporary object of 340 /// class type, return the expression that actually constructs that 341 /// temporary object. 342 const Expr *getTemporaryObject() const; 343 344 const Expr *IgnoreParens() const { 345 return const_cast<Expr*>(this)->IgnoreParens(); 346 } 347 const Expr *IgnoreParenCasts() const { 348 return const_cast<Expr*>(this)->IgnoreParenCasts(); 349 } 350 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 351 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 352 } 353 354 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 355 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 356 357 static bool classof(const Stmt *T) { 358 return T->getStmtClass() >= firstExprConstant && 359 T->getStmtClass() <= lastExprConstant; 360 } 361 static bool classof(const Expr *) { return true; } 362}; 363 364 365//===----------------------------------------------------------------------===// 366// Primary Expressions. 367//===----------------------------------------------------------------------===// 368 369/// \brief Represents the qualifier that may precede a C++ name, e.g., the 370/// "std::" in "std::sort". 371struct NameQualifier { 372 /// \brief The nested name specifier. 373 NestedNameSpecifier *NNS; 374 375 /// \brief The source range covered by the nested name specifier. 376 SourceRange Range; 377}; 378 379/// \brief Represents an explicit template argument list in C++, e.g., 380/// the "<int>" in "sort<int>". 381struct ExplicitTemplateArgumentList { 382 /// \brief The source location of the left angle bracket ('<'); 383 SourceLocation LAngleLoc; 384 385 /// \brief The source location of the right angle bracket ('>'); 386 SourceLocation RAngleLoc; 387 388 /// \brief The number of template arguments in TemplateArgs. 389 /// The actual template arguments (if any) are stored after the 390 /// ExplicitTemplateArgumentList structure. 391 unsigned NumTemplateArgs; 392 393 /// \brief Retrieve the template arguments 394 TemplateArgumentLoc *getTemplateArgs() { 395 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 396 } 397 398 /// \brief Retrieve the template arguments 399 const TemplateArgumentLoc *getTemplateArgs() const { 400 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 401 } 402 403 void initializeFrom(const TemplateArgumentListInfo &List); 404 void copyInto(TemplateArgumentListInfo &List) const; 405 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 406}; 407 408/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 409/// enum, etc. 410class DeclRefExpr : public Expr { 411 enum { 412 // Flag on DecoratedD that specifies when this declaration reference 413 // expression has a C++ nested-name-specifier. 414 HasQualifierFlag = 0x01, 415 // Flag on DecoratedD that specifies when this declaration reference 416 // expression has an explicit C++ template argument list. 417 HasExplicitTemplateArgumentListFlag = 0x02 418 }; 419 420 // DecoratedD - The declaration that we are referencing, plus two bits to 421 // indicate whether (1) the declaration's name was explicitly qualified and 422 // (2) the declaration's name was followed by an explicit template 423 // argument list. 424 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 425 426 // Loc - The location of the declaration name itself. 427 SourceLocation Loc; 428 429 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 430 NameQualifier *getNameQualifier() { 431 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 432 return 0; 433 434 return reinterpret_cast<NameQualifier *> (this + 1); 435 } 436 437 /// \brief Retrieve the qualifier that preceded the member name, if any. 438 const NameQualifier *getNameQualifier() const { 439 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 440 } 441 442 /// \brief Retrieve the explicit template argument list that followed the 443 /// member template name, if any. 444 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 445 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 446 return 0; 447 448 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 449 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 450 451 return reinterpret_cast<ExplicitTemplateArgumentList *>( 452 getNameQualifier() + 1); 453 } 454 455 /// \brief Retrieve the explicit template argument list that followed the 456 /// member template name, if any. 457 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 458 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 459 } 460 461 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 462 ValueDecl *D, SourceLocation NameLoc, 463 const TemplateArgumentListInfo *TemplateArgs, 464 QualType T); 465 466protected: 467 /// \brief Computes the type- and value-dependence flags for this 468 /// declaration reference expression. 469 void computeDependence(); 470 471 DeclRefExpr(StmtClass SC, ValueDecl *d, QualType t, SourceLocation l) : 472 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 473 computeDependence(); 474 } 475 476public: 477 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 478 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 479 computeDependence(); 480 } 481 482 /// \brief Construct an empty declaration reference expression. 483 explicit DeclRefExpr(EmptyShell Empty) 484 : Expr(DeclRefExprClass, Empty) { } 485 486 static DeclRefExpr *Create(ASTContext &Context, 487 NestedNameSpecifier *Qualifier, 488 SourceRange QualifierRange, 489 ValueDecl *D, 490 SourceLocation NameLoc, 491 QualType T, 492 const TemplateArgumentListInfo *TemplateArgs = 0); 493 494 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 495 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 496 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 497 498 SourceLocation getLocation() const { return Loc; } 499 void setLocation(SourceLocation L) { Loc = L; } 500 virtual SourceRange getSourceRange() const; 501 502 /// \brief Determine whether this declaration reference was preceded by a 503 /// C++ nested-name-specifier, e.g., \c N::foo. 504 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 505 506 /// \brief If the name was qualified, retrieves the source range of 507 /// the nested-name-specifier that precedes the name. Otherwise, 508 /// returns an empty source range. 509 SourceRange getQualifierRange() const { 510 if (!hasQualifier()) 511 return SourceRange(); 512 513 return getNameQualifier()->Range; 514 } 515 516 /// \brief If the name was qualified, retrieves the nested-name-specifier 517 /// that precedes the name. Otherwise, returns NULL. 518 NestedNameSpecifier *getQualifier() const { 519 if (!hasQualifier()) 520 return 0; 521 522 return getNameQualifier()->NNS; 523 } 524 525 /// \brief Determines whether this member expression actually had a C++ 526 /// template argument list explicitly specified, e.g., x.f<int>. 527 bool hasExplicitTemplateArgumentList() const { 528 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 529 } 530 531 /// \brief Copies the template arguments (if present) into the given 532 /// structure. 533 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 534 if (hasExplicitTemplateArgumentList()) 535 getExplicitTemplateArgumentList()->copyInto(List); 536 } 537 538 /// \brief Retrieve the location of the left angle bracket following the 539 /// member name ('<'), if any. 540 SourceLocation getLAngleLoc() const { 541 if (!hasExplicitTemplateArgumentList()) 542 return SourceLocation(); 543 544 return getExplicitTemplateArgumentList()->LAngleLoc; 545 } 546 547 /// \brief Retrieve the template arguments provided as part of this 548 /// template-id. 549 const TemplateArgumentLoc *getTemplateArgs() const { 550 if (!hasExplicitTemplateArgumentList()) 551 return 0; 552 553 return getExplicitTemplateArgumentList()->getTemplateArgs(); 554 } 555 556 /// \brief Retrieve the number of template arguments provided as part of this 557 /// template-id. 558 unsigned getNumTemplateArgs() const { 559 if (!hasExplicitTemplateArgumentList()) 560 return 0; 561 562 return getExplicitTemplateArgumentList()->NumTemplateArgs; 563 } 564 565 /// \brief Retrieve the location of the right angle bracket following the 566 /// template arguments ('>'). 567 SourceLocation getRAngleLoc() const { 568 if (!hasExplicitTemplateArgumentList()) 569 return SourceLocation(); 570 571 return getExplicitTemplateArgumentList()->RAngleLoc; 572 } 573 574 static bool classof(const Stmt *T) { 575 return T->getStmtClass() == DeclRefExprClass; 576 } 577 static bool classof(const DeclRefExpr *) { return true; } 578 579 // Iterators 580 virtual child_iterator child_begin(); 581 virtual child_iterator child_end(); 582}; 583 584/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 585class PredefinedExpr : public Expr { 586public: 587 enum IdentType { 588 Func, 589 Function, 590 PrettyFunction, 591 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 592 /// 'virtual' keyword is omitted for virtual member functions. 593 PrettyFunctionNoVirtual 594 }; 595 596private: 597 SourceLocation Loc; 598 IdentType Type; 599public: 600 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 601 : Expr(PredefinedExprClass, type, type->isDependentType(), 602 type->isDependentType()), Loc(l), Type(IT) {} 603 604 /// \brief Construct an empty predefined expression. 605 explicit PredefinedExpr(EmptyShell Empty) 606 : Expr(PredefinedExprClass, Empty) { } 607 608 IdentType getIdentType() const { return Type; } 609 void setIdentType(IdentType IT) { Type = IT; } 610 611 SourceLocation getLocation() const { return Loc; } 612 void setLocation(SourceLocation L) { Loc = L; } 613 614 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 615 616 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 617 618 static bool classof(const Stmt *T) { 619 return T->getStmtClass() == PredefinedExprClass; 620 } 621 static bool classof(const PredefinedExpr *) { return true; } 622 623 // Iterators 624 virtual child_iterator child_begin(); 625 virtual child_iterator child_end(); 626}; 627 628class IntegerLiteral : public Expr { 629 llvm::APInt Value; 630 SourceLocation Loc; 631public: 632 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 633 // or UnsignedLongLongTy 634 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 635 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 636 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 637 } 638 639 /// \brief Construct an empty integer literal. 640 explicit IntegerLiteral(EmptyShell Empty) 641 : Expr(IntegerLiteralClass, Empty) { } 642 643 const llvm::APInt &getValue() const { return Value; } 644 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 645 646 /// \brief Retrieve the location of the literal. 647 SourceLocation getLocation() const { return Loc; } 648 649 void setValue(const llvm::APInt &Val) { Value = Val; } 650 void setLocation(SourceLocation Location) { Loc = Location; } 651 652 static bool classof(const Stmt *T) { 653 return T->getStmtClass() == IntegerLiteralClass; 654 } 655 static bool classof(const IntegerLiteral *) { return true; } 656 657 // Iterators 658 virtual child_iterator child_begin(); 659 virtual child_iterator child_end(); 660}; 661 662class CharacterLiteral : public Expr { 663 unsigned Value; 664 SourceLocation Loc; 665 bool IsWide; 666public: 667 // type should be IntTy 668 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 669 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 670 IsWide(iswide) { 671 } 672 673 /// \brief Construct an empty character literal. 674 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 675 676 SourceLocation getLocation() const { return Loc; } 677 bool isWide() const { return IsWide; } 678 679 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 680 681 unsigned getValue() const { return Value; } 682 683 void setLocation(SourceLocation Location) { Loc = Location; } 684 void setWide(bool W) { IsWide = W; } 685 void setValue(unsigned Val) { Value = Val; } 686 687 static bool classof(const Stmt *T) { 688 return T->getStmtClass() == CharacterLiteralClass; 689 } 690 static bool classof(const CharacterLiteral *) { return true; } 691 692 // Iterators 693 virtual child_iterator child_begin(); 694 virtual child_iterator child_end(); 695}; 696 697class FloatingLiteral : public Expr { 698 llvm::APFloat Value; 699 bool IsExact : 1; 700 SourceLocation Loc; 701public: 702 FloatingLiteral(const llvm::APFloat &V, bool isexact, 703 QualType Type, SourceLocation L) 704 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 705 IsExact(isexact), Loc(L) {} 706 707 /// \brief Construct an empty floating-point literal. 708 explicit FloatingLiteral(EmptyShell Empty) 709 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 710 711 const llvm::APFloat &getValue() const { return Value; } 712 void setValue(const llvm::APFloat &Val) { Value = Val; } 713 714 bool isExact() const { return IsExact; } 715 void setExact(bool E) { IsExact = E; } 716 717 /// getValueAsApproximateDouble - This returns the value as an inaccurate 718 /// double. Note that this may cause loss of precision, but is useful for 719 /// debugging dumps, etc. 720 double getValueAsApproximateDouble() const; 721 722 SourceLocation getLocation() const { return Loc; } 723 void setLocation(SourceLocation L) { Loc = L; } 724 725 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 726 727 static bool classof(const Stmt *T) { 728 return T->getStmtClass() == FloatingLiteralClass; 729 } 730 static bool classof(const FloatingLiteral *) { return true; } 731 732 // Iterators 733 virtual child_iterator child_begin(); 734 virtual child_iterator child_end(); 735}; 736 737/// ImaginaryLiteral - We support imaginary integer and floating point literals, 738/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 739/// IntegerLiteral classes. Instances of this class always have a Complex type 740/// whose element type matches the subexpression. 741/// 742class ImaginaryLiteral : public Expr { 743 Stmt *Val; 744public: 745 ImaginaryLiteral(Expr *val, QualType Ty) 746 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 747 748 /// \brief Build an empty imaginary literal. 749 explicit ImaginaryLiteral(EmptyShell Empty) 750 : Expr(ImaginaryLiteralClass, Empty) { } 751 752 const Expr *getSubExpr() const { return cast<Expr>(Val); } 753 Expr *getSubExpr() { return cast<Expr>(Val); } 754 void setSubExpr(Expr *E) { Val = E; } 755 756 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 757 static bool classof(const Stmt *T) { 758 return T->getStmtClass() == ImaginaryLiteralClass; 759 } 760 static bool classof(const ImaginaryLiteral *) { return true; } 761 762 // Iterators 763 virtual child_iterator child_begin(); 764 virtual child_iterator child_end(); 765}; 766 767/// StringLiteral - This represents a string literal expression, e.g. "foo" 768/// or L"bar" (wide strings). The actual string is returned by getStrData() 769/// is NOT null-terminated, and the length of the string is determined by 770/// calling getByteLength(). The C type for a string is always a 771/// ConstantArrayType. In C++, the char type is const qualified, in C it is 772/// not. 773/// 774/// Note that strings in C can be formed by concatenation of multiple string 775/// literal pptokens in translation phase #6. This keeps track of the locations 776/// of each of these pieces. 777/// 778/// Strings in C can also be truncated and extended by assigning into arrays, 779/// e.g. with constructs like: 780/// char X[2] = "foobar"; 781/// In this case, getByteLength() will return 6, but the string literal will 782/// have type "char[2]". 783class StringLiteral : public Expr { 784 const char *StrData; 785 unsigned ByteLength; 786 bool IsWide; 787 unsigned NumConcatenated; 788 SourceLocation TokLocs[1]; 789 790 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 791 792protected: 793 virtual void DoDestroy(ASTContext &C); 794 795public: 796 /// This is the "fully general" constructor that allows representation of 797 /// strings formed from multiple concatenated tokens. 798 static StringLiteral *Create(ASTContext &C, const char *StrData, 799 unsigned ByteLength, bool Wide, QualType Ty, 800 const SourceLocation *Loc, unsigned NumStrs); 801 802 /// Simple constructor for string literals made from one token. 803 static StringLiteral *Create(ASTContext &C, const char *StrData, 804 unsigned ByteLength, 805 bool Wide, QualType Ty, SourceLocation Loc) { 806 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 807 } 808 809 /// \brief Construct an empty string literal. 810 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 811 812 llvm::StringRef getString() const { 813 return llvm::StringRef(StrData, ByteLength); 814 } 815 // FIXME: These are deprecated, replace with StringRef. 816 const char *getStrData() const { return StrData; } 817 unsigned getByteLength() const { return ByteLength; } 818 819 /// \brief Sets the string data to the given string data. 820 void setString(ASTContext &C, llvm::StringRef Str); 821 822 bool isWide() const { return IsWide; } 823 void setWide(bool W) { IsWide = W; } 824 825 bool containsNonAsciiOrNull() const { 826 llvm::StringRef Str = getString(); 827 for (unsigned i = 0, e = Str.size(); i != e; ++i) 828 if (!isascii(Str[i]) || !Str[i]) 829 return true; 830 return false; 831 } 832 /// getNumConcatenated - Get the number of string literal tokens that were 833 /// concatenated in translation phase #6 to form this string literal. 834 unsigned getNumConcatenated() const { return NumConcatenated; } 835 836 SourceLocation getStrTokenLoc(unsigned TokNum) const { 837 assert(TokNum < NumConcatenated && "Invalid tok number"); 838 return TokLocs[TokNum]; 839 } 840 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 841 assert(TokNum < NumConcatenated && "Invalid tok number"); 842 TokLocs[TokNum] = L; 843 } 844 845 typedef const SourceLocation *tokloc_iterator; 846 tokloc_iterator tokloc_begin() const { return TokLocs; } 847 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 848 849 virtual SourceRange getSourceRange() const { 850 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 851 } 852 static bool classof(const Stmt *T) { 853 return T->getStmtClass() == StringLiteralClass; 854 } 855 static bool classof(const StringLiteral *) { return true; } 856 857 // Iterators 858 virtual child_iterator child_begin(); 859 virtual child_iterator child_end(); 860}; 861 862/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 863/// AST node is only formed if full location information is requested. 864class ParenExpr : public Expr { 865 SourceLocation L, R; 866 Stmt *Val; 867public: 868 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 869 : Expr(ParenExprClass, val->getType(), 870 val->isTypeDependent(), val->isValueDependent()), 871 L(l), R(r), Val(val) {} 872 873 /// \brief Construct an empty parenthesized expression. 874 explicit ParenExpr(EmptyShell Empty) 875 : Expr(ParenExprClass, Empty) { } 876 877 const Expr *getSubExpr() const { return cast<Expr>(Val); } 878 Expr *getSubExpr() { return cast<Expr>(Val); } 879 void setSubExpr(Expr *E) { Val = E; } 880 881 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 882 883 /// \brief Get the location of the left parentheses '('. 884 SourceLocation getLParen() const { return L; } 885 void setLParen(SourceLocation Loc) { L = Loc; } 886 887 /// \brief Get the location of the right parentheses ')'. 888 SourceLocation getRParen() const { return R; } 889 void setRParen(SourceLocation Loc) { R = Loc; } 890 891 static bool classof(const Stmt *T) { 892 return T->getStmtClass() == ParenExprClass; 893 } 894 static bool classof(const ParenExpr *) { return true; } 895 896 // Iterators 897 virtual child_iterator child_begin(); 898 virtual child_iterator child_end(); 899}; 900 901 902/// UnaryOperator - This represents the unary-expression's (except sizeof and 903/// alignof), the postinc/postdec operators from postfix-expression, and various 904/// extensions. 905/// 906/// Notes on various nodes: 907/// 908/// Real/Imag - These return the real/imag part of a complex operand. If 909/// applied to a non-complex value, the former returns its operand and the 910/// later returns zero in the type of the operand. 911/// 912/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 913/// subexpression is a compound literal with the various MemberExpr and 914/// ArraySubscriptExpr's applied to it. (This is only used in C) 915/// 916class UnaryOperator : public Expr { 917public: 918 // Note that additions to this should also update the StmtVisitor class. 919 enum Opcode { 920 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 921 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 922 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 923 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 924 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 925 Real, Imag, // "__real expr"/"__imag expr" Extension. 926 Extension, // __extension__ marker. 927 OffsetOf // __builtin_offsetof 928 }; 929private: 930 Stmt *Val; 931 Opcode Opc; 932 SourceLocation Loc; 933public: 934 935 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 936 : Expr(UnaryOperatorClass, type, 937 input->isTypeDependent() && opc != OffsetOf, 938 input->isValueDependent()), 939 Val(input), Opc(opc), Loc(l) {} 940 941 /// \brief Build an empty unary operator. 942 explicit UnaryOperator(EmptyShell Empty) 943 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 944 945 Opcode getOpcode() const { return Opc; } 946 void setOpcode(Opcode O) { Opc = O; } 947 948 Expr *getSubExpr() const { return cast<Expr>(Val); } 949 void setSubExpr(Expr *E) { Val = E; } 950 951 /// getOperatorLoc - Return the location of the operator. 952 SourceLocation getOperatorLoc() const { return Loc; } 953 void setOperatorLoc(SourceLocation L) { Loc = L; } 954 955 /// isPostfix - Return true if this is a postfix operation, like x++. 956 static bool isPostfix(Opcode Op) { 957 return Op == PostInc || Op == PostDec; 958 } 959 960 /// isPostfix - Return true if this is a prefix operation, like --x. 961 static bool isPrefix(Opcode Op) { 962 return Op == PreInc || Op == PreDec; 963 } 964 965 bool isPrefix() const { return isPrefix(Opc); } 966 bool isPostfix() const { return isPostfix(Opc); } 967 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 968 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 969 bool isOffsetOfOp() const { return Opc == OffsetOf; } 970 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 971 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 972 973 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 974 /// corresponds to, e.g. "sizeof" or "[pre]++" 975 static const char *getOpcodeStr(Opcode Op); 976 977 /// \brief Retrieve the unary opcode that corresponds to the given 978 /// overloaded operator. 979 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 980 981 /// \brief Retrieve the overloaded operator kind that corresponds to 982 /// the given unary opcode. 983 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 984 985 virtual SourceRange getSourceRange() const { 986 if (isPostfix()) 987 return SourceRange(Val->getLocStart(), Loc); 988 else 989 return SourceRange(Loc, Val->getLocEnd()); 990 } 991 virtual SourceLocation getExprLoc() const { return Loc; } 992 993 static bool classof(const Stmt *T) { 994 return T->getStmtClass() == UnaryOperatorClass; 995 } 996 static bool classof(const UnaryOperator *) { return true; } 997 998 // Iterators 999 virtual child_iterator child_begin(); 1000 virtual child_iterator child_end(); 1001}; 1002 1003/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1004/// offsetof(record-type, member-designator). For example, given: 1005/// @code 1006/// struct S { 1007/// float f; 1008/// double d; 1009/// }; 1010/// struct T { 1011/// int i; 1012/// struct S s[10]; 1013/// }; 1014/// @endcode 1015/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1016 1017class OffsetOfExpr : public Expr { 1018public: 1019 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1020 class OffsetOfNode { 1021 public: 1022 /// \brief The kind of offsetof node we have. 1023 enum Kind { 1024 /// \brief An index into an array. 1025 Array = 0x00, 1026 /// \brief A field. 1027 Field = 0x01, 1028 /// \brief A field in a dependent type, known only by its name. 1029 Identifier = 0x02, 1030 /// \brief An implicit indirection through a C++ base class, when the 1031 /// field found is in a base class. 1032 Base = 0x03 1033 }; 1034 1035 private: 1036 enum { MaskBits = 2, Mask = 0x03 }; 1037 1038 /// \brief The source range that covers this part of the designator. 1039 SourceRange Range; 1040 1041 /// \brief The data describing the designator, which comes in three 1042 /// different forms, depending on the lower two bits. 1043 /// - An unsigned index into the array of Expr*'s stored after this node 1044 /// in memory, for [constant-expression] designators. 1045 /// - A FieldDecl*, for references to a known field. 1046 /// - An IdentifierInfo*, for references to a field with a given name 1047 /// when the class type is dependent. 1048 /// - A CXXBaseSpecifier*, for references that look at a field in a 1049 /// base class. 1050 uintptr_t Data; 1051 1052 public: 1053 /// \brief Create an offsetof node that refers to an array element. 1054 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1055 SourceLocation RBracketLoc) 1056 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1057 1058 /// \brief Create an offsetof node that refers to a field. 1059 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1060 SourceLocation NameLoc) 1061 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1062 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1063 1064 /// \brief Create an offsetof node that refers to an identifier. 1065 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1066 SourceLocation NameLoc) 1067 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1068 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1069 1070 /// \brief Create an offsetof node that refers into a C++ base class. 1071 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1072 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1073 1074 /// \brief Determine what kind of offsetof node this is. 1075 Kind getKind() const { 1076 return static_cast<Kind>(Data & Mask); 1077 } 1078 1079 /// \brief For an array element node, returns the index into the array 1080 /// of expressions. 1081 unsigned getArrayExprIndex() const { 1082 assert(getKind() == Array); 1083 return Data >> 2; 1084 } 1085 1086 /// \brief For a field offsetof node, returns the field. 1087 FieldDecl *getField() const { 1088 assert(getKind() == Field); 1089 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1090 } 1091 1092 /// \brief For a field or identifier offsetof node, returns the name of 1093 /// the field. 1094 IdentifierInfo *getFieldName() const; 1095 1096 /// \brief For a base class node, returns the base specifier. 1097 CXXBaseSpecifier *getBase() const { 1098 assert(getKind() == Base); 1099 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1100 } 1101 1102 /// \brief Retrieve the source range that covers this offsetof node. 1103 /// 1104 /// For an array element node, the source range contains the locations of 1105 /// the square brackets. For a field or identifier node, the source range 1106 /// contains the location of the period (if there is one) and the 1107 /// identifier. 1108 SourceRange getRange() const { return Range; } 1109 }; 1110 1111private: 1112 1113 SourceLocation OperatorLoc, RParenLoc; 1114 // Base type; 1115 TypeSourceInfo *TSInfo; 1116 // Number of sub-components (i.e. instances of OffsetOfNode). 1117 unsigned NumComps; 1118 // Number of sub-expressions (i.e. array subscript expressions). 1119 unsigned NumExprs; 1120 1121 OffsetOfExpr(ASTContext &C, QualType type, 1122 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1123 OffsetOfNode* compsPtr, unsigned numComps, 1124 Expr** exprsPtr, unsigned numExprs, 1125 SourceLocation RParenLoc); 1126 1127 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1128 : Expr(OffsetOfExprClass, EmptyShell()), 1129 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1130 1131public: 1132 1133 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1134 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1135 OffsetOfNode* compsPtr, unsigned numComps, 1136 Expr** exprsPtr, unsigned numExprs, 1137 SourceLocation RParenLoc); 1138 1139 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1140 unsigned NumComps, unsigned NumExprs); 1141 1142 /// getOperatorLoc - Return the location of the operator. 1143 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1144 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1145 1146 /// \brief Return the location of the right parentheses. 1147 SourceLocation getRParenLoc() const { return RParenLoc; } 1148 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1149 1150 TypeSourceInfo *getTypeSourceInfo() const { 1151 return TSInfo; 1152 } 1153 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1154 TSInfo = tsi; 1155 } 1156 1157 const OffsetOfNode &getComponent(unsigned Idx) { 1158 assert(Idx < NumComps && "Subscript out of range"); 1159 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1160 } 1161 1162 void setComponent(unsigned Idx, OffsetOfNode ON) { 1163 assert(Idx < NumComps && "Subscript out of range"); 1164 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1165 } 1166 1167 unsigned getNumComponents() const { 1168 return NumComps; 1169 } 1170 1171 Expr* getIndexExpr(unsigned Idx) { 1172 assert(Idx < NumExprs && "Subscript out of range"); 1173 return reinterpret_cast<Expr **>( 1174 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1175 } 1176 1177 void setIndexExpr(unsigned Idx, Expr* E) { 1178 assert(Idx < NumComps && "Subscript out of range"); 1179 reinterpret_cast<Expr **>( 1180 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1181 } 1182 1183 unsigned getNumExpressions() const { 1184 return NumExprs; 1185 } 1186 1187 virtual SourceRange getSourceRange() const { 1188 return SourceRange(OperatorLoc, RParenLoc); 1189 } 1190 1191 static bool classof(const Stmt *T) { 1192 return T->getStmtClass() == OffsetOfExprClass; 1193 } 1194 1195 static bool classof(const OffsetOfExpr *) { return true; } 1196 1197 // Iterators 1198 virtual child_iterator child_begin(); 1199 virtual child_iterator child_end(); 1200}; 1201 1202/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1203/// types and expressions. 1204class SizeOfAlignOfExpr : public Expr { 1205 bool isSizeof : 1; // true if sizeof, false if alignof. 1206 bool isType : 1; // true if operand is a type, false if an expression 1207 union { 1208 TypeSourceInfo *Ty; 1209 Stmt *Ex; 1210 } Argument; 1211 SourceLocation OpLoc, RParenLoc; 1212 1213protected: 1214 virtual void DoDestroy(ASTContext& C); 1215 1216public: 1217 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1218 QualType resultType, SourceLocation op, 1219 SourceLocation rp) : 1220 Expr(SizeOfAlignOfExprClass, resultType, 1221 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1222 // Value-dependent if the argument is type-dependent. 1223 TInfo->getType()->isDependentType()), 1224 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1225 Argument.Ty = TInfo; 1226 } 1227 1228 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1229 QualType resultType, SourceLocation op, 1230 SourceLocation rp) : 1231 Expr(SizeOfAlignOfExprClass, resultType, 1232 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1233 // Value-dependent if the argument is type-dependent. 1234 E->isTypeDependent()), 1235 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1236 Argument.Ex = E; 1237 } 1238 1239 /// \brief Construct an empty sizeof/alignof expression. 1240 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1241 : Expr(SizeOfAlignOfExprClass, Empty) { } 1242 1243 bool isSizeOf() const { return isSizeof; } 1244 void setSizeof(bool S) { isSizeof = S; } 1245 1246 bool isArgumentType() const { return isType; } 1247 QualType getArgumentType() const { 1248 return getArgumentTypeInfo()->getType(); 1249 } 1250 TypeSourceInfo *getArgumentTypeInfo() const { 1251 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1252 return Argument.Ty; 1253 } 1254 Expr *getArgumentExpr() { 1255 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1256 return static_cast<Expr*>(Argument.Ex); 1257 } 1258 const Expr *getArgumentExpr() const { 1259 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1260 } 1261 1262 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1263 void setArgument(TypeSourceInfo *TInfo) { 1264 Argument.Ty = TInfo; 1265 isType = true; 1266 } 1267 1268 /// Gets the argument type, or the type of the argument expression, whichever 1269 /// is appropriate. 1270 QualType getTypeOfArgument() const { 1271 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1272 } 1273 1274 SourceLocation getOperatorLoc() const { return OpLoc; } 1275 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1276 1277 SourceLocation getRParenLoc() const { return RParenLoc; } 1278 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1279 1280 virtual SourceRange getSourceRange() const { 1281 return SourceRange(OpLoc, RParenLoc); 1282 } 1283 1284 static bool classof(const Stmt *T) { 1285 return T->getStmtClass() == SizeOfAlignOfExprClass; 1286 } 1287 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1288 1289 // Iterators 1290 virtual child_iterator child_begin(); 1291 virtual child_iterator child_end(); 1292}; 1293 1294//===----------------------------------------------------------------------===// 1295// Postfix Operators. 1296//===----------------------------------------------------------------------===// 1297 1298/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1299class ArraySubscriptExpr : public Expr { 1300 enum { LHS, RHS, END_EXPR=2 }; 1301 Stmt* SubExprs[END_EXPR]; 1302 SourceLocation RBracketLoc; 1303public: 1304 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1305 SourceLocation rbracketloc) 1306 : Expr(ArraySubscriptExprClass, t, 1307 lhs->isTypeDependent() || rhs->isTypeDependent(), 1308 lhs->isValueDependent() || rhs->isValueDependent()), 1309 RBracketLoc(rbracketloc) { 1310 SubExprs[LHS] = lhs; 1311 SubExprs[RHS] = rhs; 1312 } 1313 1314 /// \brief Create an empty array subscript expression. 1315 explicit ArraySubscriptExpr(EmptyShell Shell) 1316 : Expr(ArraySubscriptExprClass, Shell) { } 1317 1318 /// An array access can be written A[4] or 4[A] (both are equivalent). 1319 /// - getBase() and getIdx() always present the normalized view: A[4]. 1320 /// In this case getBase() returns "A" and getIdx() returns "4". 1321 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1322 /// 4[A] getLHS() returns "4". 1323 /// Note: Because vector element access is also written A[4] we must 1324 /// predicate the format conversion in getBase and getIdx only on the 1325 /// the type of the RHS, as it is possible for the LHS to be a vector of 1326 /// integer type 1327 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1328 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1329 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1330 1331 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1332 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1333 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1334 1335 Expr *getBase() { 1336 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1337 } 1338 1339 const Expr *getBase() const { 1340 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1341 } 1342 1343 Expr *getIdx() { 1344 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1345 } 1346 1347 const Expr *getIdx() const { 1348 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1349 } 1350 1351 virtual SourceRange getSourceRange() const { 1352 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1353 } 1354 1355 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1356 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1357 1358 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1359 1360 static bool classof(const Stmt *T) { 1361 return T->getStmtClass() == ArraySubscriptExprClass; 1362 } 1363 static bool classof(const ArraySubscriptExpr *) { return true; } 1364 1365 // Iterators 1366 virtual child_iterator child_begin(); 1367 virtual child_iterator child_end(); 1368}; 1369 1370 1371/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1372/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1373/// while its subclasses may represent alternative syntax that (semantically) 1374/// results in a function call. For example, CXXOperatorCallExpr is 1375/// a subclass for overloaded operator calls that use operator syntax, e.g., 1376/// "str1 + str2" to resolve to a function call. 1377class CallExpr : public Expr { 1378 enum { FN=0, ARGS_START=1 }; 1379 Stmt **SubExprs; 1380 unsigned NumArgs; 1381 SourceLocation RParenLoc; 1382 1383protected: 1384 // This version of the constructor is for derived classes. 1385 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1386 QualType t, SourceLocation rparenloc); 1387 1388 virtual void DoDestroy(ASTContext& C); 1389 1390public: 1391 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1392 SourceLocation rparenloc); 1393 1394 /// \brief Build an empty call expression. 1395 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1396 1397 ~CallExpr() {} 1398 1399 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1400 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1401 void setCallee(Expr *F) { SubExprs[FN] = F; } 1402 1403 Decl *getCalleeDecl(); 1404 const Decl *getCalleeDecl() const { 1405 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1406 } 1407 1408 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1409 FunctionDecl *getDirectCallee(); 1410 const FunctionDecl *getDirectCallee() const { 1411 return const_cast<CallExpr*>(this)->getDirectCallee(); 1412 } 1413 1414 /// getNumArgs - Return the number of actual arguments to this call. 1415 /// 1416 unsigned getNumArgs() const { return NumArgs; } 1417 1418 /// getArg - Return the specified argument. 1419 Expr *getArg(unsigned Arg) { 1420 assert(Arg < NumArgs && "Arg access out of range!"); 1421 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1422 } 1423 const Expr *getArg(unsigned Arg) const { 1424 assert(Arg < NumArgs && "Arg access out of range!"); 1425 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1426 } 1427 1428 /// setArg - Set the specified argument. 1429 void setArg(unsigned Arg, Expr *ArgExpr) { 1430 assert(Arg < NumArgs && "Arg access out of range!"); 1431 SubExprs[Arg+ARGS_START] = ArgExpr; 1432 } 1433 1434 /// setNumArgs - This changes the number of arguments present in this call. 1435 /// Any orphaned expressions are deleted by this, and any new operands are set 1436 /// to null. 1437 void setNumArgs(ASTContext& C, unsigned NumArgs); 1438 1439 typedef ExprIterator arg_iterator; 1440 typedef ConstExprIterator const_arg_iterator; 1441 1442 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1443 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1444 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1445 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1446 1447 /// getNumCommas - Return the number of commas that must have been present in 1448 /// this function call. 1449 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1450 1451 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1452 /// not, return 0. 1453 unsigned isBuiltinCall(ASTContext &Context) const; 1454 1455 /// getCallReturnType - Get the return type of the call expr. This is not 1456 /// always the type of the expr itself, if the return type is a reference 1457 /// type. 1458 QualType getCallReturnType() const; 1459 1460 SourceLocation getRParenLoc() const { return RParenLoc; } 1461 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1462 1463 virtual SourceRange getSourceRange() const { 1464 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1465 } 1466 1467 static bool classof(const Stmt *T) { 1468 return T->getStmtClass() >= firstCallExprConstant && 1469 T->getStmtClass() <= lastCallExprConstant; 1470 } 1471 static bool classof(const CallExpr *) { return true; } 1472 1473 // Iterators 1474 virtual child_iterator child_begin(); 1475 virtual child_iterator child_end(); 1476}; 1477 1478/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1479/// 1480class MemberExpr : public Expr { 1481 /// Extra data stored in some member expressions. 1482 struct MemberNameQualifier : public NameQualifier { 1483 DeclAccessPair FoundDecl; 1484 }; 1485 1486 /// Base - the expression for the base pointer or structure references. In 1487 /// X.F, this is "X". 1488 Stmt *Base; 1489 1490 /// MemberDecl - This is the decl being referenced by the field/member name. 1491 /// In X.F, this is the decl referenced by F. 1492 ValueDecl *MemberDecl; 1493 1494 /// MemberLoc - This is the location of the member name. 1495 SourceLocation MemberLoc; 1496 1497 /// IsArrow - True if this is "X->F", false if this is "X.F". 1498 bool IsArrow : 1; 1499 1500 /// \brief True if this member expression used a nested-name-specifier to 1501 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1502 /// declaration. When true, a MemberNameQualifier 1503 /// structure is allocated immediately after the MemberExpr. 1504 bool HasQualifierOrFoundDecl : 1; 1505 1506 /// \brief True if this member expression specified a template argument list 1507 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1508 /// structure (and its TemplateArguments) are allocated immediately after 1509 /// the MemberExpr or, if the member expression also has a qualifier, after 1510 /// the MemberNameQualifier structure. 1511 bool HasExplicitTemplateArgumentList : 1; 1512 1513 /// \brief Retrieve the qualifier that preceded the member name, if any. 1514 MemberNameQualifier *getMemberQualifier() { 1515 assert(HasQualifierOrFoundDecl); 1516 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1517 } 1518 1519 /// \brief Retrieve the qualifier that preceded the member name, if any. 1520 const MemberNameQualifier *getMemberQualifier() const { 1521 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1522 } 1523 1524 /// \brief Retrieve the explicit template argument list that followed the 1525 /// member template name, if any. 1526 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1527 if (!HasExplicitTemplateArgumentList) 1528 return 0; 1529 1530 if (!HasQualifierOrFoundDecl) 1531 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1532 1533 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1534 getMemberQualifier() + 1); 1535 } 1536 1537 /// \brief Retrieve the explicit template argument list that followed the 1538 /// member template name, if any. 1539 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1540 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1541 } 1542 1543public: 1544 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1545 SourceLocation l, QualType ty) 1546 : Expr(MemberExprClass, ty, 1547 base->isTypeDependent(), base->isValueDependent()), 1548 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1549 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1550 1551 /// \brief Build an empty member reference expression. 1552 explicit MemberExpr(EmptyShell Empty) 1553 : Expr(MemberExprClass, Empty), HasQualifierOrFoundDecl(false), 1554 HasExplicitTemplateArgumentList(false) { } 1555 1556 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1557 NestedNameSpecifier *qual, SourceRange qualrange, 1558 ValueDecl *memberdecl, DeclAccessPair founddecl, 1559 SourceLocation l, 1560 const TemplateArgumentListInfo *targs, 1561 QualType ty); 1562 1563 void setBase(Expr *E) { Base = E; } 1564 Expr *getBase() const { return cast<Expr>(Base); } 1565 1566 /// \brief Retrieve the member declaration to which this expression refers. 1567 /// 1568 /// The returned declaration will either be a FieldDecl or (in C++) 1569 /// a CXXMethodDecl. 1570 ValueDecl *getMemberDecl() const { return MemberDecl; } 1571 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1572 1573 /// \brief Retrieves the declaration found by lookup. 1574 DeclAccessPair getFoundDecl() const { 1575 if (!HasQualifierOrFoundDecl) 1576 return DeclAccessPair::make(getMemberDecl(), 1577 getMemberDecl()->getAccess()); 1578 return getMemberQualifier()->FoundDecl; 1579 } 1580 1581 /// \brief Determines whether this member expression actually had 1582 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1583 /// x->Base::foo. 1584 bool hasQualifier() const { return getQualifier() != 0; } 1585 1586 /// \brief If the member name was qualified, retrieves the source range of 1587 /// the nested-name-specifier that precedes the member name. Otherwise, 1588 /// returns an empty source range. 1589 SourceRange getQualifierRange() const { 1590 if (!HasQualifierOrFoundDecl) 1591 return SourceRange(); 1592 1593 return getMemberQualifier()->Range; 1594 } 1595 1596 /// \brief If the member name was qualified, retrieves the 1597 /// nested-name-specifier that precedes the member name. Otherwise, returns 1598 /// NULL. 1599 NestedNameSpecifier *getQualifier() const { 1600 if (!HasQualifierOrFoundDecl) 1601 return 0; 1602 1603 return getMemberQualifier()->NNS; 1604 } 1605 1606 /// \brief Determines whether this member expression actually had a C++ 1607 /// template argument list explicitly specified, e.g., x.f<int>. 1608 bool hasExplicitTemplateArgumentList() const { 1609 return HasExplicitTemplateArgumentList; 1610 } 1611 1612 /// \brief Copies the template arguments (if present) into the given 1613 /// structure. 1614 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1615 if (hasExplicitTemplateArgumentList()) 1616 getExplicitTemplateArgumentList()->copyInto(List); 1617 } 1618 1619 /// \brief Retrieve the location of the left angle bracket following the 1620 /// member name ('<'), if any. 1621 SourceLocation getLAngleLoc() const { 1622 if (!HasExplicitTemplateArgumentList) 1623 return SourceLocation(); 1624 1625 return getExplicitTemplateArgumentList()->LAngleLoc; 1626 } 1627 1628 /// \brief Retrieve the template arguments provided as part of this 1629 /// template-id. 1630 const TemplateArgumentLoc *getTemplateArgs() const { 1631 if (!HasExplicitTemplateArgumentList) 1632 return 0; 1633 1634 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1635 } 1636 1637 /// \brief Retrieve the number of template arguments provided as part of this 1638 /// template-id. 1639 unsigned getNumTemplateArgs() const { 1640 if (!HasExplicitTemplateArgumentList) 1641 return 0; 1642 1643 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1644 } 1645 1646 /// \brief Retrieve the location of the right angle bracket following the 1647 /// template arguments ('>'). 1648 SourceLocation getRAngleLoc() const { 1649 if (!HasExplicitTemplateArgumentList) 1650 return SourceLocation(); 1651 1652 return getExplicitTemplateArgumentList()->RAngleLoc; 1653 } 1654 1655 bool isArrow() const { return IsArrow; } 1656 void setArrow(bool A) { IsArrow = A; } 1657 1658 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1659 /// location of 'F'. 1660 SourceLocation getMemberLoc() const { return MemberLoc; } 1661 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1662 1663 virtual SourceRange getSourceRange() const { 1664 // If we have an implicit base (like a C++ implicit this), 1665 // make sure not to return its location 1666 SourceLocation EndLoc = MemberLoc; 1667 if (HasExplicitTemplateArgumentList) 1668 EndLoc = getRAngleLoc(); 1669 1670 SourceLocation BaseLoc = getBase()->getLocStart(); 1671 if (BaseLoc.isInvalid()) 1672 return SourceRange(MemberLoc, EndLoc); 1673 return SourceRange(BaseLoc, EndLoc); 1674 } 1675 1676 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1677 1678 static bool classof(const Stmt *T) { 1679 return T->getStmtClass() == MemberExprClass; 1680 } 1681 static bool classof(const MemberExpr *) { return true; } 1682 1683 // Iterators 1684 virtual child_iterator child_begin(); 1685 virtual child_iterator child_end(); 1686}; 1687 1688/// CompoundLiteralExpr - [C99 6.5.2.5] 1689/// 1690class CompoundLiteralExpr : public Expr { 1691 /// LParenLoc - If non-null, this is the location of the left paren in a 1692 /// compound literal like "(int){4}". This can be null if this is a 1693 /// synthesized compound expression. 1694 SourceLocation LParenLoc; 1695 1696 /// The type as written. This can be an incomplete array type, in 1697 /// which case the actual expression type will be different. 1698 TypeSourceInfo *TInfo; 1699 Stmt *Init; 1700 bool FileScope; 1701public: 1702 // FIXME: Can compound literals be value-dependent? 1703 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1704 QualType T, Expr *init, bool fileScope) 1705 : Expr(CompoundLiteralExprClass, T, 1706 tinfo->getType()->isDependentType(), false), 1707 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1708 1709 /// \brief Construct an empty compound literal. 1710 explicit CompoundLiteralExpr(EmptyShell Empty) 1711 : Expr(CompoundLiteralExprClass, Empty) { } 1712 1713 const Expr *getInitializer() const { return cast<Expr>(Init); } 1714 Expr *getInitializer() { return cast<Expr>(Init); } 1715 void setInitializer(Expr *E) { Init = E; } 1716 1717 bool isFileScope() const { return FileScope; } 1718 void setFileScope(bool FS) { FileScope = FS; } 1719 1720 SourceLocation getLParenLoc() const { return LParenLoc; } 1721 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1722 1723 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1724 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1725 1726 virtual SourceRange getSourceRange() const { 1727 // FIXME: Init should never be null. 1728 if (!Init) 1729 return SourceRange(); 1730 if (LParenLoc.isInvalid()) 1731 return Init->getSourceRange(); 1732 return SourceRange(LParenLoc, Init->getLocEnd()); 1733 } 1734 1735 static bool classof(const Stmt *T) { 1736 return T->getStmtClass() == CompoundLiteralExprClass; 1737 } 1738 static bool classof(const CompoundLiteralExpr *) { return true; } 1739 1740 // Iterators 1741 virtual child_iterator child_begin(); 1742 virtual child_iterator child_end(); 1743}; 1744 1745/// CastExpr - Base class for type casts, including both implicit 1746/// casts (ImplicitCastExpr) and explicit casts that have some 1747/// representation in the source code (ExplicitCastExpr's derived 1748/// classes). 1749class CastExpr : public Expr { 1750public: 1751 /// CastKind - the kind of cast this represents. 1752 enum CastKind { 1753 /// CK_Unknown - Unknown cast kind. 1754 /// FIXME: The goal is to get rid of this and make all casts have a 1755 /// kind so that the AST client doesn't have to try to figure out what's 1756 /// going on. 1757 CK_Unknown, 1758 1759 /// CK_BitCast - Used for reinterpret_cast. 1760 CK_BitCast, 1761 1762 /// CK_NoOp - Used for const_cast. 1763 CK_NoOp, 1764 1765 /// CK_BaseToDerived - Base to derived class casts. 1766 CK_BaseToDerived, 1767 1768 /// CK_DerivedToBase - Derived to base class casts. 1769 CK_DerivedToBase, 1770 1771 /// CK_UncheckedDerivedToBase - Derived to base class casts that 1772 /// assume that the derived pointer is not null. 1773 CK_UncheckedDerivedToBase, 1774 1775 /// CK_Dynamic - Dynamic cast. 1776 CK_Dynamic, 1777 1778 /// CK_ToUnion - Cast to union (GCC extension). 1779 CK_ToUnion, 1780 1781 /// CK_ArrayToPointerDecay - Array to pointer decay. 1782 CK_ArrayToPointerDecay, 1783 1784 // CK_FunctionToPointerDecay - Function to pointer decay. 1785 CK_FunctionToPointerDecay, 1786 1787 /// CK_NullToMemberPointer - Null pointer to member pointer. 1788 CK_NullToMemberPointer, 1789 1790 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1791 /// member pointer in derived class. 1792 CK_BaseToDerivedMemberPointer, 1793 1794 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1795 /// member pointer in base class. 1796 CK_DerivedToBaseMemberPointer, 1797 1798 /// CK_UserDefinedConversion - Conversion using a user defined type 1799 /// conversion function. 1800 CK_UserDefinedConversion, 1801 1802 /// CK_ConstructorConversion - Conversion by constructor 1803 CK_ConstructorConversion, 1804 1805 /// CK_IntegralToPointer - Integral to pointer 1806 CK_IntegralToPointer, 1807 1808 /// CK_PointerToIntegral - Pointer to integral 1809 CK_PointerToIntegral, 1810 1811 /// CK_ToVoid - Cast to void. 1812 CK_ToVoid, 1813 1814 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1815 /// vector type with the same element type as the src type. Splats the 1816 /// src expression into the destination expression. 1817 CK_VectorSplat, 1818 1819 /// CK_IntegralCast - Casting between integral types of different size. 1820 CK_IntegralCast, 1821 1822 /// CK_IntegralToFloating - Integral to floating point. 1823 CK_IntegralToFloating, 1824 1825 /// CK_FloatingToIntegral - Floating point to integral. 1826 CK_FloatingToIntegral, 1827 1828 /// CK_FloatingCast - Casting between floating types of different size. 1829 CK_FloatingCast, 1830 1831 /// CK_MemberPointerToBoolean - Member pointer to boolean 1832 CK_MemberPointerToBoolean, 1833 1834 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1835 /// pointer 1836 CK_AnyPointerToObjCPointerCast, 1837 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1838 /// pointer 1839 CK_AnyPointerToBlockPointerCast 1840 1841 }; 1842 1843private: 1844 CastKind Kind; 1845 Stmt *Op; 1846 1847 /// BasePath - For derived-to-base and base-to-derived casts, the base array 1848 /// contains the inheritance path. 1849 CXXBaseSpecifierArray BasePath; 1850 1851 void CheckBasePath() const { 1852#ifndef NDEBUG 1853 switch (getCastKind()) { 1854 case CK_DerivedToBase: 1855 case CK_UncheckedDerivedToBase: 1856 case CK_DerivedToBaseMemberPointer: 1857 case CK_BaseToDerived: 1858 case CK_BaseToDerivedMemberPointer: 1859 assert(!BasePath.empty() && "Cast kind should have a base path!"); 1860 break; 1861 1862 // These should not have an inheritance path. 1863 case CK_Unknown: 1864 case CK_BitCast: 1865 case CK_NoOp: 1866 case CK_Dynamic: 1867 case CK_ToUnion: 1868 case CK_ArrayToPointerDecay: 1869 case CK_FunctionToPointerDecay: 1870 case CK_NullToMemberPointer: 1871 case CK_UserDefinedConversion: 1872 case CK_ConstructorConversion: 1873 case CK_IntegralToPointer: 1874 case CK_PointerToIntegral: 1875 case CK_ToVoid: 1876 case CK_VectorSplat: 1877 case CK_IntegralCast: 1878 case CK_IntegralToFloating: 1879 case CK_FloatingToIntegral: 1880 case CK_FloatingCast: 1881 case CK_MemberPointerToBoolean: 1882 case CK_AnyPointerToObjCPointerCast: 1883 case CK_AnyPointerToBlockPointerCast: 1884 assert(BasePath.empty() && "Cast kind should not have a base path!"); 1885 break; 1886 } 1887#endif 1888 } 1889 1890protected: 1891 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1892 CXXBaseSpecifierArray BasePath) : 1893 Expr(SC, ty, 1894 // Cast expressions are type-dependent if the type is 1895 // dependent (C++ [temp.dep.expr]p3). 1896 ty->isDependentType(), 1897 // Cast expressions are value-dependent if the type is 1898 // dependent or if the subexpression is value-dependent. 1899 ty->isDependentType() || (op && op->isValueDependent())), 1900 Kind(kind), Op(op), BasePath(BasePath) { 1901 CheckBasePath(); 1902 } 1903 1904 /// \brief Construct an empty cast. 1905 CastExpr(StmtClass SC, EmptyShell Empty) 1906 : Expr(SC, Empty) { } 1907 1908 virtual void DoDestroy(ASTContext &C); 1909 1910public: 1911 CastKind getCastKind() const { return Kind; } 1912 void setCastKind(CastKind K) { Kind = K; } 1913 const char *getCastKindName() const; 1914 1915 Expr *getSubExpr() { return cast<Expr>(Op); } 1916 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1917 void setSubExpr(Expr *E) { Op = E; } 1918 1919 /// \brief Retrieve the cast subexpression as it was written in the source 1920 /// code, looking through any implicit casts or other intermediate nodes 1921 /// introduced by semantic analysis. 1922 Expr *getSubExprAsWritten(); 1923 const Expr *getSubExprAsWritten() const { 1924 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 1925 } 1926 1927 const CXXBaseSpecifierArray& getBasePath() const { return BasePath; } 1928 1929 static bool classof(const Stmt *T) { 1930 return T->getStmtClass() >= firstCastExprConstant && 1931 T->getStmtClass() <= lastCastExprConstant; 1932 } 1933 static bool classof(const CastExpr *) { return true; } 1934 1935 // Iterators 1936 virtual child_iterator child_begin(); 1937 virtual child_iterator child_end(); 1938}; 1939 1940/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1941/// conversions, which have no direct representation in the original 1942/// source code. For example: converting T[]->T*, void f()->void 1943/// (*f)(), float->double, short->int, etc. 1944/// 1945/// In C, implicit casts always produce rvalues. However, in C++, an 1946/// implicit cast whose result is being bound to a reference will be 1947/// an lvalue. For example: 1948/// 1949/// @code 1950/// class Base { }; 1951/// class Derived : public Base { }; 1952/// void f(Derived d) { 1953/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1954/// } 1955/// @endcode 1956class ImplicitCastExpr : public CastExpr { 1957 /// LvalueCast - Whether this cast produces an lvalue. 1958 bool LvalueCast; 1959 1960public: 1961 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 1962 CXXBaseSpecifierArray BasePath, bool Lvalue) 1963 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePath), 1964 LvalueCast(Lvalue) { } 1965 1966 /// \brief Construct an empty implicit cast. 1967 explicit ImplicitCastExpr(EmptyShell Shell) 1968 : CastExpr(ImplicitCastExprClass, Shell) { } 1969 1970 virtual SourceRange getSourceRange() const { 1971 return getSubExpr()->getSourceRange(); 1972 } 1973 1974 /// isLvalueCast - Whether this cast produces an lvalue. 1975 bool isLvalueCast() const { return LvalueCast; } 1976 1977 /// setLvalueCast - Set whether this cast produces an lvalue. 1978 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1979 1980 static bool classof(const Stmt *T) { 1981 return T->getStmtClass() == ImplicitCastExprClass; 1982 } 1983 static bool classof(const ImplicitCastExpr *) { return true; } 1984}; 1985 1986/// ExplicitCastExpr - An explicit cast written in the source 1987/// code. 1988/// 1989/// This class is effectively an abstract class, because it provides 1990/// the basic representation of an explicitly-written cast without 1991/// specifying which kind of cast (C cast, functional cast, static 1992/// cast, etc.) was written; specific derived classes represent the 1993/// particular style of cast and its location information. 1994/// 1995/// Unlike implicit casts, explicit cast nodes have two different 1996/// types: the type that was written into the source code, and the 1997/// actual type of the expression as determined by semantic 1998/// analysis. These types may differ slightly. For example, in C++ one 1999/// can cast to a reference type, which indicates that the resulting 2000/// expression will be an lvalue. The reference type, however, will 2001/// not be used as the type of the expression. 2002class ExplicitCastExpr : public CastExpr { 2003 /// TInfo - Source type info for the (written) type 2004 /// this expression is casting to. 2005 TypeSourceInfo *TInfo; 2006 2007protected: 2008 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2009 Expr *op, CXXBaseSpecifierArray BasePath, 2010 TypeSourceInfo *writtenTy) 2011 : CastExpr(SC, exprTy, kind, op, BasePath), TInfo(writtenTy) {} 2012 2013 /// \brief Construct an empty explicit cast. 2014 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 2015 : CastExpr(SC, Shell) { } 2016 2017public: 2018 /// getTypeInfoAsWritten - Returns the type source info for the type 2019 /// that this expression is casting to. 2020 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2021 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2022 2023 /// getTypeAsWritten - Returns the type that this expression is 2024 /// casting to, as written in the source code. 2025 QualType getTypeAsWritten() const { return TInfo->getType(); } 2026 2027 static bool classof(const Stmt *T) { 2028 return T->getStmtClass() >= firstExplicitCastExprConstant && 2029 T->getStmtClass() <= lastExplicitCastExprConstant; 2030 } 2031 static bool classof(const ExplicitCastExpr *) { return true; } 2032}; 2033 2034/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2035/// cast in C++ (C++ [expr.cast]), which uses the syntax 2036/// (Type)expr. For example: @c (int)f. 2037class CStyleCastExpr : public ExplicitCastExpr { 2038 SourceLocation LPLoc; // the location of the left paren 2039 SourceLocation RPLoc; // the location of the right paren 2040public: 2041 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2042 CXXBaseSpecifierArray BasePath, TypeSourceInfo *writtenTy, 2043 SourceLocation l, SourceLocation r) 2044 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, BasePath, 2045 writtenTy), LPLoc(l), RPLoc(r) {} 2046 2047 /// \brief Construct an empty C-style explicit cast. 2048 explicit CStyleCastExpr(EmptyShell Shell) 2049 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 2050 2051 SourceLocation getLParenLoc() const { return LPLoc; } 2052 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2053 2054 SourceLocation getRParenLoc() const { return RPLoc; } 2055 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2056 2057 virtual SourceRange getSourceRange() const { 2058 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2059 } 2060 static bool classof(const Stmt *T) { 2061 return T->getStmtClass() == CStyleCastExprClass; 2062 } 2063 static bool classof(const CStyleCastExpr *) { return true; } 2064}; 2065 2066/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2067/// 2068/// This expression node kind describes a builtin binary operation, 2069/// such as "x + y" for integer values "x" and "y". The operands will 2070/// already have been converted to appropriate types (e.g., by 2071/// performing promotions or conversions). 2072/// 2073/// In C++, where operators may be overloaded, a different kind of 2074/// expression node (CXXOperatorCallExpr) is used to express the 2075/// invocation of an overloaded operator with operator syntax. Within 2076/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2077/// used to store an expression "x + y" depends on the subexpressions 2078/// for x and y. If neither x or y is type-dependent, and the "+" 2079/// operator resolves to a built-in operation, BinaryOperator will be 2080/// used to express the computation (x and y may still be 2081/// value-dependent). If either x or y is type-dependent, or if the 2082/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2083/// be used to express the computation. 2084class BinaryOperator : public Expr { 2085public: 2086 enum Opcode { 2087 // Operators listed in order of precedence. 2088 // Note that additions to this should also update the StmtVisitor class. 2089 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 2090 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 2091 Add, Sub, // [C99 6.5.6] Additive operators. 2092 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 2093 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 2094 EQ, NE, // [C99 6.5.9] Equality operators. 2095 And, // [C99 6.5.10] Bitwise AND operator. 2096 Xor, // [C99 6.5.11] Bitwise XOR operator. 2097 Or, // [C99 6.5.12] Bitwise OR operator. 2098 LAnd, // [C99 6.5.13] Logical AND operator. 2099 LOr, // [C99 6.5.14] Logical OR operator. 2100 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 2101 DivAssign, RemAssign, 2102 AddAssign, SubAssign, 2103 ShlAssign, ShrAssign, 2104 AndAssign, XorAssign, 2105 OrAssign, 2106 Comma // [C99 6.5.17] Comma operator. 2107 }; 2108private: 2109 enum { LHS, RHS, END_EXPR }; 2110 Stmt* SubExprs[END_EXPR]; 2111 Opcode Opc; 2112 SourceLocation OpLoc; 2113public: 2114 2115 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2116 SourceLocation opLoc) 2117 : Expr(BinaryOperatorClass, ResTy, 2118 lhs->isTypeDependent() || rhs->isTypeDependent(), 2119 lhs->isValueDependent() || rhs->isValueDependent()), 2120 Opc(opc), OpLoc(opLoc) { 2121 SubExprs[LHS] = lhs; 2122 SubExprs[RHS] = rhs; 2123 assert(!isCompoundAssignmentOp() && 2124 "Use ArithAssignBinaryOperator for compound assignments"); 2125 } 2126 2127 /// \brief Construct an empty binary operator. 2128 explicit BinaryOperator(EmptyShell Empty) 2129 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 2130 2131 SourceLocation getOperatorLoc() const { return OpLoc; } 2132 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2133 2134 Opcode getOpcode() const { return Opc; } 2135 void setOpcode(Opcode O) { Opc = O; } 2136 2137 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2138 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2139 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2140 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2141 2142 virtual SourceRange getSourceRange() const { 2143 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2144 } 2145 2146 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2147 /// corresponds to, e.g. "<<=". 2148 static const char *getOpcodeStr(Opcode Op); 2149 2150 /// \brief Retrieve the binary opcode that corresponds to the given 2151 /// overloaded operator. 2152 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2153 2154 /// \brief Retrieve the overloaded operator kind that corresponds to 2155 /// the given binary opcode. 2156 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2157 2158 /// predicates to categorize the respective opcodes. 2159 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 2160 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 2161 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 2162 bool isShiftOp() const { return isShiftOp(Opc); } 2163 2164 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 2165 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 2166 2167 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 2168 bool isRelationalOp() const { return isRelationalOp(Opc); } 2169 2170 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 2171 bool isEqualityOp() const { return isEqualityOp(Opc); } 2172 2173 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 2174 bool isComparisonOp() const { return isComparisonOp(Opc); } 2175 2176 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 2177 bool isLogicalOp() const { return isLogicalOp(Opc); } 2178 2179 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 2180 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 2181 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 2182 2183 static bool classof(const Stmt *S) { 2184 return S->getStmtClass() >= firstBinaryOperatorConstant && 2185 S->getStmtClass() <= lastBinaryOperatorConstant; 2186 } 2187 static bool classof(const BinaryOperator *) { return true; } 2188 2189 // Iterators 2190 virtual child_iterator child_begin(); 2191 virtual child_iterator child_end(); 2192 2193protected: 2194 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2195 SourceLocation opLoc, bool dead) 2196 : Expr(CompoundAssignOperatorClass, ResTy, 2197 lhs->isTypeDependent() || rhs->isTypeDependent(), 2198 lhs->isValueDependent() || rhs->isValueDependent()), 2199 Opc(opc), OpLoc(opLoc) { 2200 SubExprs[LHS] = lhs; 2201 SubExprs[RHS] = rhs; 2202 } 2203 2204 BinaryOperator(StmtClass SC, EmptyShell Empty) 2205 : Expr(SC, Empty), Opc(MulAssign) { } 2206}; 2207 2208/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2209/// track of the type the operation is performed in. Due to the semantics of 2210/// these operators, the operands are promoted, the aritmetic performed, an 2211/// implicit conversion back to the result type done, then the assignment takes 2212/// place. This captures the intermediate type which the computation is done 2213/// in. 2214class CompoundAssignOperator : public BinaryOperator { 2215 QualType ComputationLHSType; 2216 QualType ComputationResultType; 2217public: 2218 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2219 QualType ResType, QualType CompLHSType, 2220 QualType CompResultType, 2221 SourceLocation OpLoc) 2222 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2223 ComputationLHSType(CompLHSType), 2224 ComputationResultType(CompResultType) { 2225 assert(isCompoundAssignmentOp() && 2226 "Only should be used for compound assignments"); 2227 } 2228 2229 /// \brief Build an empty compound assignment operator expression. 2230 explicit CompoundAssignOperator(EmptyShell Empty) 2231 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2232 2233 // The two computation types are the type the LHS is converted 2234 // to for the computation and the type of the result; the two are 2235 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2236 QualType getComputationLHSType() const { return ComputationLHSType; } 2237 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2238 2239 QualType getComputationResultType() const { return ComputationResultType; } 2240 void setComputationResultType(QualType T) { ComputationResultType = T; } 2241 2242 static bool classof(const CompoundAssignOperator *) { return true; } 2243 static bool classof(const Stmt *S) { 2244 return S->getStmtClass() == CompoundAssignOperatorClass; 2245 } 2246}; 2247 2248/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2249/// GNU "missing LHS" extension is in use. 2250/// 2251class ConditionalOperator : public Expr { 2252 enum { COND, LHS, RHS, END_EXPR }; 2253 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2254 SourceLocation QuestionLoc, ColonLoc; 2255public: 2256 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2257 SourceLocation CLoc, Expr *rhs, QualType t) 2258 : Expr(ConditionalOperatorClass, t, 2259 // FIXME: the type of the conditional operator doesn't 2260 // depend on the type of the conditional, but the standard 2261 // seems to imply that it could. File a bug! 2262 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2263 (cond->isValueDependent() || 2264 (lhs && lhs->isValueDependent()) || 2265 (rhs && rhs->isValueDependent()))), 2266 QuestionLoc(QLoc), 2267 ColonLoc(CLoc) { 2268 SubExprs[COND] = cond; 2269 SubExprs[LHS] = lhs; 2270 SubExprs[RHS] = rhs; 2271 } 2272 2273 /// \brief Build an empty conditional operator. 2274 explicit ConditionalOperator(EmptyShell Empty) 2275 : Expr(ConditionalOperatorClass, Empty) { } 2276 2277 // getCond - Return the expression representing the condition for 2278 // the ?: operator. 2279 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2280 void setCond(Expr *E) { SubExprs[COND] = E; } 2281 2282 // getTrueExpr - Return the subexpression representing the value of the ?: 2283 // expression if the condition evaluates to true. In most cases this value 2284 // will be the same as getLHS() except a GCC extension allows the left 2285 // subexpression to be omitted, and instead of the condition be returned. 2286 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2287 // is only evaluated once. 2288 Expr *getTrueExpr() const { 2289 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2290 } 2291 2292 // getTrueExpr - Return the subexpression representing the value of the ?: 2293 // expression if the condition evaluates to false. This is the same as getRHS. 2294 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2295 2296 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2297 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2298 2299 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2300 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2301 2302 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2303 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2304 2305 SourceLocation getColonLoc() const { return ColonLoc; } 2306 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2307 2308 virtual SourceRange getSourceRange() const { 2309 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2310 } 2311 static bool classof(const Stmt *T) { 2312 return T->getStmtClass() == ConditionalOperatorClass; 2313 } 2314 static bool classof(const ConditionalOperator *) { return true; } 2315 2316 // Iterators 2317 virtual child_iterator child_begin(); 2318 virtual child_iterator child_end(); 2319}; 2320 2321/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2322class AddrLabelExpr : public Expr { 2323 SourceLocation AmpAmpLoc, LabelLoc; 2324 LabelStmt *Label; 2325public: 2326 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2327 QualType t) 2328 : Expr(AddrLabelExprClass, t, false, false), 2329 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2330 2331 /// \brief Build an empty address of a label expression. 2332 explicit AddrLabelExpr(EmptyShell Empty) 2333 : Expr(AddrLabelExprClass, Empty) { } 2334 2335 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2336 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2337 SourceLocation getLabelLoc() const { return LabelLoc; } 2338 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2339 2340 virtual SourceRange getSourceRange() const { 2341 return SourceRange(AmpAmpLoc, LabelLoc); 2342 } 2343 2344 LabelStmt *getLabel() const { return Label; } 2345 void setLabel(LabelStmt *S) { Label = S; } 2346 2347 static bool classof(const Stmt *T) { 2348 return T->getStmtClass() == AddrLabelExprClass; 2349 } 2350 static bool classof(const AddrLabelExpr *) { return true; } 2351 2352 // Iterators 2353 virtual child_iterator child_begin(); 2354 virtual child_iterator child_end(); 2355}; 2356 2357/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2358/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2359/// takes the value of the last subexpression. 2360class StmtExpr : public Expr { 2361 Stmt *SubStmt; 2362 SourceLocation LParenLoc, RParenLoc; 2363public: 2364 // FIXME: Does type-dependence need to be computed differently? 2365 StmtExpr(CompoundStmt *substmt, QualType T, 2366 SourceLocation lp, SourceLocation rp) : 2367 Expr(StmtExprClass, T, T->isDependentType(), false), 2368 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2369 2370 /// \brief Build an empty statement expression. 2371 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2372 2373 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2374 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2375 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2376 2377 virtual SourceRange getSourceRange() const { 2378 return SourceRange(LParenLoc, RParenLoc); 2379 } 2380 2381 SourceLocation getLParenLoc() const { return LParenLoc; } 2382 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2383 SourceLocation getRParenLoc() const { return RParenLoc; } 2384 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2385 2386 static bool classof(const Stmt *T) { 2387 return T->getStmtClass() == StmtExprClass; 2388 } 2389 static bool classof(const StmtExpr *) { return true; } 2390 2391 // Iterators 2392 virtual child_iterator child_begin(); 2393 virtual child_iterator child_end(); 2394}; 2395 2396/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2397/// This AST node represents a function that returns 1 if two *types* (not 2398/// expressions) are compatible. The result of this built-in function can be 2399/// used in integer constant expressions. 2400class TypesCompatibleExpr : public Expr { 2401 QualType Type1; 2402 QualType Type2; 2403 SourceLocation BuiltinLoc, RParenLoc; 2404public: 2405 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2406 QualType t1, QualType t2, SourceLocation RP) : 2407 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2408 Type1(t1), Type2(t2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2409 2410 /// \brief Build an empty __builtin_type_compatible_p expression. 2411 explicit TypesCompatibleExpr(EmptyShell Empty) 2412 : Expr(TypesCompatibleExprClass, Empty) { } 2413 2414 QualType getArgType1() const { return Type1; } 2415 void setArgType1(QualType T) { Type1 = T; } 2416 QualType getArgType2() const { return Type2; } 2417 void setArgType2(QualType T) { Type2 = T; } 2418 2419 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2420 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2421 2422 SourceLocation getRParenLoc() const { return RParenLoc; } 2423 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2424 2425 virtual SourceRange getSourceRange() const { 2426 return SourceRange(BuiltinLoc, RParenLoc); 2427 } 2428 static bool classof(const Stmt *T) { 2429 return T->getStmtClass() == TypesCompatibleExprClass; 2430 } 2431 static bool classof(const TypesCompatibleExpr *) { return true; } 2432 2433 // Iterators 2434 virtual child_iterator child_begin(); 2435 virtual child_iterator child_end(); 2436}; 2437 2438/// ShuffleVectorExpr - clang-specific builtin-in function 2439/// __builtin_shufflevector. 2440/// This AST node represents a operator that does a constant 2441/// shuffle, similar to LLVM's shufflevector instruction. It takes 2442/// two vectors and a variable number of constant indices, 2443/// and returns the appropriately shuffled vector. 2444class ShuffleVectorExpr : public Expr { 2445 SourceLocation BuiltinLoc, RParenLoc; 2446 2447 // SubExprs - the list of values passed to the __builtin_shufflevector 2448 // function. The first two are vectors, and the rest are constant 2449 // indices. The number of values in this list is always 2450 // 2+the number of indices in the vector type. 2451 Stmt **SubExprs; 2452 unsigned NumExprs; 2453 2454protected: 2455 virtual void DoDestroy(ASTContext &C); 2456 2457public: 2458 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2459 // to be computed differently? 2460 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2461 QualType Type, SourceLocation BLoc, 2462 SourceLocation RP) : 2463 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2464 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2465 2466 SubExprs = new (C) Stmt*[nexpr]; 2467 for (unsigned i = 0; i < nexpr; i++) 2468 SubExprs[i] = args[i]; 2469 } 2470 2471 /// \brief Build an empty vector-shuffle expression. 2472 explicit ShuffleVectorExpr(EmptyShell Empty) 2473 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2474 2475 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2476 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2477 2478 SourceLocation getRParenLoc() const { return RParenLoc; } 2479 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2480 2481 virtual SourceRange getSourceRange() const { 2482 return SourceRange(BuiltinLoc, RParenLoc); 2483 } 2484 static bool classof(const Stmt *T) { 2485 return T->getStmtClass() == ShuffleVectorExprClass; 2486 } 2487 static bool classof(const ShuffleVectorExpr *) { return true; } 2488 2489 ~ShuffleVectorExpr() {} 2490 2491 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2492 /// constant expression, the actual arguments passed in, and the function 2493 /// pointers. 2494 unsigned getNumSubExprs() const { return NumExprs; } 2495 2496 /// getExpr - Return the Expr at the specified index. 2497 Expr *getExpr(unsigned Index) { 2498 assert((Index < NumExprs) && "Arg access out of range!"); 2499 return cast<Expr>(SubExprs[Index]); 2500 } 2501 const Expr *getExpr(unsigned Index) const { 2502 assert((Index < NumExprs) && "Arg access out of range!"); 2503 return cast<Expr>(SubExprs[Index]); 2504 } 2505 2506 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2507 2508 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2509 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2510 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2511 } 2512 2513 // Iterators 2514 virtual child_iterator child_begin(); 2515 virtual child_iterator child_end(); 2516}; 2517 2518/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2519/// This AST node is similar to the conditional operator (?:) in C, with 2520/// the following exceptions: 2521/// - the test expression must be a integer constant expression. 2522/// - the expression returned acts like the chosen subexpression in every 2523/// visible way: the type is the same as that of the chosen subexpression, 2524/// and all predicates (whether it's an l-value, whether it's an integer 2525/// constant expression, etc.) return the same result as for the chosen 2526/// sub-expression. 2527class ChooseExpr : public Expr { 2528 enum { COND, LHS, RHS, END_EXPR }; 2529 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2530 SourceLocation BuiltinLoc, RParenLoc; 2531public: 2532 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2533 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2534 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2535 BuiltinLoc(BLoc), RParenLoc(RP) { 2536 SubExprs[COND] = cond; 2537 SubExprs[LHS] = lhs; 2538 SubExprs[RHS] = rhs; 2539 } 2540 2541 /// \brief Build an empty __builtin_choose_expr. 2542 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2543 2544 /// isConditionTrue - Return whether the condition is true (i.e. not 2545 /// equal to zero). 2546 bool isConditionTrue(ASTContext &C) const; 2547 2548 /// getChosenSubExpr - Return the subexpression chosen according to the 2549 /// condition. 2550 Expr *getChosenSubExpr(ASTContext &C) const { 2551 return isConditionTrue(C) ? getLHS() : getRHS(); 2552 } 2553 2554 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2555 void setCond(Expr *E) { SubExprs[COND] = E; } 2556 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2557 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2558 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2559 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2560 2561 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2562 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2563 2564 SourceLocation getRParenLoc() const { return RParenLoc; } 2565 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2566 2567 virtual SourceRange getSourceRange() const { 2568 return SourceRange(BuiltinLoc, RParenLoc); 2569 } 2570 static bool classof(const Stmt *T) { 2571 return T->getStmtClass() == ChooseExprClass; 2572 } 2573 static bool classof(const ChooseExpr *) { return true; } 2574 2575 // Iterators 2576 virtual child_iterator child_begin(); 2577 virtual child_iterator child_end(); 2578}; 2579 2580/// GNUNullExpr - Implements the GNU __null extension, which is a name 2581/// for a null pointer constant that has integral type (e.g., int or 2582/// long) and is the same size and alignment as a pointer. The __null 2583/// extension is typically only used by system headers, which define 2584/// NULL as __null in C++ rather than using 0 (which is an integer 2585/// that may not match the size of a pointer). 2586class GNUNullExpr : public Expr { 2587 /// TokenLoc - The location of the __null keyword. 2588 SourceLocation TokenLoc; 2589 2590public: 2591 GNUNullExpr(QualType Ty, SourceLocation Loc) 2592 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2593 2594 /// \brief Build an empty GNU __null expression. 2595 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2596 2597 /// getTokenLocation - The location of the __null token. 2598 SourceLocation getTokenLocation() const { return TokenLoc; } 2599 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2600 2601 virtual SourceRange getSourceRange() const { 2602 return SourceRange(TokenLoc); 2603 } 2604 static bool classof(const Stmt *T) { 2605 return T->getStmtClass() == GNUNullExprClass; 2606 } 2607 static bool classof(const GNUNullExpr *) { return true; } 2608 2609 // Iterators 2610 virtual child_iterator child_begin(); 2611 virtual child_iterator child_end(); 2612}; 2613 2614/// VAArgExpr, used for the builtin function __builtin_va_arg. 2615class VAArgExpr : public Expr { 2616 Stmt *Val; 2617 SourceLocation BuiltinLoc, RParenLoc; 2618public: 2619 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2620 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2621 Val(e), 2622 BuiltinLoc(BLoc), 2623 RParenLoc(RPLoc) { } 2624 2625 /// \brief Create an empty __builtin_va_arg expression. 2626 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2627 2628 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2629 Expr *getSubExpr() { return cast<Expr>(Val); } 2630 void setSubExpr(Expr *E) { Val = E; } 2631 2632 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2633 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2634 2635 SourceLocation getRParenLoc() const { return RParenLoc; } 2636 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2637 2638 virtual SourceRange getSourceRange() const { 2639 return SourceRange(BuiltinLoc, RParenLoc); 2640 } 2641 static bool classof(const Stmt *T) { 2642 return T->getStmtClass() == VAArgExprClass; 2643 } 2644 static bool classof(const VAArgExpr *) { return true; } 2645 2646 // Iterators 2647 virtual child_iterator child_begin(); 2648 virtual child_iterator child_end(); 2649}; 2650 2651/// @brief Describes an C or C++ initializer list. 2652/// 2653/// InitListExpr describes an initializer list, which can be used to 2654/// initialize objects of different types, including 2655/// struct/class/union types, arrays, and vectors. For example: 2656/// 2657/// @code 2658/// struct foo x = { 1, { 2, 3 } }; 2659/// @endcode 2660/// 2661/// Prior to semantic analysis, an initializer list will represent the 2662/// initializer list as written by the user, but will have the 2663/// placeholder type "void". This initializer list is called the 2664/// syntactic form of the initializer, and may contain C99 designated 2665/// initializers (represented as DesignatedInitExprs), initializations 2666/// of subobject members without explicit braces, and so on. Clients 2667/// interested in the original syntax of the initializer list should 2668/// use the syntactic form of the initializer list. 2669/// 2670/// After semantic analysis, the initializer list will represent the 2671/// semantic form of the initializer, where the initializations of all 2672/// subobjects are made explicit with nested InitListExpr nodes and 2673/// C99 designators have been eliminated by placing the designated 2674/// initializations into the subobject they initialize. Additionally, 2675/// any "holes" in the initialization, where no initializer has been 2676/// specified for a particular subobject, will be replaced with 2677/// implicitly-generated ImplicitValueInitExpr expressions that 2678/// value-initialize the subobjects. Note, however, that the 2679/// initializer lists may still have fewer initializers than there are 2680/// elements to initialize within the object. 2681/// 2682/// Given the semantic form of the initializer list, one can retrieve 2683/// the original syntactic form of that initializer list (if it 2684/// exists) using getSyntacticForm(). Since many initializer lists 2685/// have the same syntactic and semantic forms, getSyntacticForm() may 2686/// return NULL, indicating that the current initializer list also 2687/// serves as its syntactic form. 2688class InitListExpr : public Expr { 2689 // FIXME: Eliminate this vector in favor of ASTContext allocation 2690 typedef ASTVector<Stmt *> InitExprsTy; 2691 InitExprsTy InitExprs; 2692 SourceLocation LBraceLoc, RBraceLoc; 2693 2694 /// Contains the initializer list that describes the syntactic form 2695 /// written in the source code. 2696 InitListExpr *SyntacticForm; 2697 2698 /// If this initializer list initializes a union, specifies which 2699 /// field within the union will be initialized. 2700 FieldDecl *UnionFieldInit; 2701 2702 /// Whether this initializer list originally had a GNU array-range 2703 /// designator in it. This is a temporary marker used by CodeGen. 2704 bool HadArrayRangeDesignator; 2705 2706public: 2707 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2708 Expr **initexprs, unsigned numinits, 2709 SourceLocation rbraceloc); 2710 2711 /// \brief Build an empty initializer list. 2712 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2713 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2714 2715 unsigned getNumInits() const { return InitExprs.size(); } 2716 2717 const Expr* getInit(unsigned Init) const { 2718 assert(Init < getNumInits() && "Initializer access out of range!"); 2719 return cast_or_null<Expr>(InitExprs[Init]); 2720 } 2721 2722 Expr* getInit(unsigned Init) { 2723 assert(Init < getNumInits() && "Initializer access out of range!"); 2724 return cast_or_null<Expr>(InitExprs[Init]); 2725 } 2726 2727 void setInit(unsigned Init, Expr *expr) { 2728 assert(Init < getNumInits() && "Initializer access out of range!"); 2729 InitExprs[Init] = expr; 2730 } 2731 2732 /// \brief Reserve space for some number of initializers. 2733 void reserveInits(ASTContext &C, unsigned NumInits); 2734 2735 /// @brief Specify the number of initializers 2736 /// 2737 /// If there are more than @p NumInits initializers, the remaining 2738 /// initializers will be destroyed. If there are fewer than @p 2739 /// NumInits initializers, NULL expressions will be added for the 2740 /// unknown initializers. 2741 void resizeInits(ASTContext &Context, unsigned NumInits); 2742 2743 /// @brief Updates the initializer at index @p Init with the new 2744 /// expression @p expr, and returns the old expression at that 2745 /// location. 2746 /// 2747 /// When @p Init is out of range for this initializer list, the 2748 /// initializer list will be extended with NULL expressions to 2749 /// accomodate the new entry. 2750 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2751 2752 /// \brief If this initializes a union, specifies which field in the 2753 /// union to initialize. 2754 /// 2755 /// Typically, this field is the first named field within the 2756 /// union. However, a designated initializer can specify the 2757 /// initialization of a different field within the union. 2758 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2759 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2760 2761 // Explicit InitListExpr's originate from source code (and have valid source 2762 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2763 bool isExplicit() { 2764 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2765 } 2766 2767 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2768 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2769 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2770 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2771 2772 /// @brief Retrieve the initializer list that describes the 2773 /// syntactic form of the initializer. 2774 /// 2775 /// 2776 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2777 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2778 2779 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2780 void sawArrayRangeDesignator(bool ARD = true) { 2781 HadArrayRangeDesignator = ARD; 2782 } 2783 2784 virtual SourceRange getSourceRange() const { 2785 return SourceRange(LBraceLoc, RBraceLoc); 2786 } 2787 static bool classof(const Stmt *T) { 2788 return T->getStmtClass() == InitListExprClass; 2789 } 2790 static bool classof(const InitListExpr *) { return true; } 2791 2792 // Iterators 2793 virtual child_iterator child_begin(); 2794 virtual child_iterator child_end(); 2795 2796 typedef InitExprsTy::iterator iterator; 2797 typedef InitExprsTy::reverse_iterator reverse_iterator; 2798 2799 iterator begin() { return InitExprs.begin(); } 2800 iterator end() { return InitExprs.end(); } 2801 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2802 reverse_iterator rend() { return InitExprs.rend(); } 2803}; 2804 2805/// @brief Represents a C99 designated initializer expression. 2806/// 2807/// A designated initializer expression (C99 6.7.8) contains one or 2808/// more designators (which can be field designators, array 2809/// designators, or GNU array-range designators) followed by an 2810/// expression that initializes the field or element(s) that the 2811/// designators refer to. For example, given: 2812/// 2813/// @code 2814/// struct point { 2815/// double x; 2816/// double y; 2817/// }; 2818/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2819/// @endcode 2820/// 2821/// The InitListExpr contains three DesignatedInitExprs, the first of 2822/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2823/// designators, one array designator for @c [2] followed by one field 2824/// designator for @c .y. The initalization expression will be 1.0. 2825class DesignatedInitExpr : public Expr { 2826public: 2827 /// \brief Forward declaration of the Designator class. 2828 class Designator; 2829 2830private: 2831 /// The location of the '=' or ':' prior to the actual initializer 2832 /// expression. 2833 SourceLocation EqualOrColonLoc; 2834 2835 /// Whether this designated initializer used the GNU deprecated 2836 /// syntax rather than the C99 '=' syntax. 2837 bool GNUSyntax : 1; 2838 2839 /// The number of designators in this initializer expression. 2840 unsigned NumDesignators : 15; 2841 2842 /// \brief The designators in this designated initialization 2843 /// expression. 2844 Designator *Designators; 2845 2846 /// The number of subexpressions of this initializer expression, 2847 /// which contains both the initializer and any additional 2848 /// expressions used by array and array-range designators. 2849 unsigned NumSubExprs : 16; 2850 2851 2852 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2853 const Designator *Designators, 2854 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2855 Expr **IndexExprs, unsigned NumIndexExprs, 2856 Expr *Init); 2857 2858 explicit DesignatedInitExpr(unsigned NumSubExprs) 2859 : Expr(DesignatedInitExprClass, EmptyShell()), 2860 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2861 2862protected: 2863 virtual void DoDestroy(ASTContext &C); 2864 2865 void DestroyDesignators(ASTContext &C); 2866 2867public: 2868 /// A field designator, e.g., ".x". 2869 struct FieldDesignator { 2870 /// Refers to the field that is being initialized. The low bit 2871 /// of this field determines whether this is actually a pointer 2872 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2873 /// initially constructed, a field designator will store an 2874 /// IdentifierInfo*. After semantic analysis has resolved that 2875 /// name, the field designator will instead store a FieldDecl*. 2876 uintptr_t NameOrField; 2877 2878 /// The location of the '.' in the designated initializer. 2879 unsigned DotLoc; 2880 2881 /// The location of the field name in the designated initializer. 2882 unsigned FieldLoc; 2883 }; 2884 2885 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2886 struct ArrayOrRangeDesignator { 2887 /// Location of the first index expression within the designated 2888 /// initializer expression's list of subexpressions. 2889 unsigned Index; 2890 /// The location of the '[' starting the array range designator. 2891 unsigned LBracketLoc; 2892 /// The location of the ellipsis separating the start and end 2893 /// indices. Only valid for GNU array-range designators. 2894 unsigned EllipsisLoc; 2895 /// The location of the ']' terminating the array range designator. 2896 unsigned RBracketLoc; 2897 }; 2898 2899 /// @brief Represents a single C99 designator. 2900 /// 2901 /// @todo This class is infuriatingly similar to clang::Designator, 2902 /// but minor differences (storing indices vs. storing pointers) 2903 /// keep us from reusing it. Try harder, later, to rectify these 2904 /// differences. 2905 class Designator { 2906 /// @brief The kind of designator this describes. 2907 enum { 2908 FieldDesignator, 2909 ArrayDesignator, 2910 ArrayRangeDesignator 2911 } Kind; 2912 2913 union { 2914 /// A field designator, e.g., ".x". 2915 struct FieldDesignator Field; 2916 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2917 struct ArrayOrRangeDesignator ArrayOrRange; 2918 }; 2919 friend class DesignatedInitExpr; 2920 2921 public: 2922 Designator() {} 2923 2924 /// @brief Initializes a field designator. 2925 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2926 SourceLocation FieldLoc) 2927 : Kind(FieldDesignator) { 2928 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2929 Field.DotLoc = DotLoc.getRawEncoding(); 2930 Field.FieldLoc = FieldLoc.getRawEncoding(); 2931 } 2932 2933 /// @brief Initializes an array designator. 2934 Designator(unsigned Index, SourceLocation LBracketLoc, 2935 SourceLocation RBracketLoc) 2936 : Kind(ArrayDesignator) { 2937 ArrayOrRange.Index = Index; 2938 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2939 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2940 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2941 } 2942 2943 /// @brief Initializes a GNU array-range designator. 2944 Designator(unsigned Index, SourceLocation LBracketLoc, 2945 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2946 : Kind(ArrayRangeDesignator) { 2947 ArrayOrRange.Index = Index; 2948 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2949 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2950 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2951 } 2952 2953 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2954 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2955 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2956 2957 IdentifierInfo * getFieldName(); 2958 2959 FieldDecl *getField() { 2960 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2961 if (Field.NameOrField & 0x01) 2962 return 0; 2963 else 2964 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2965 } 2966 2967 void setField(FieldDecl *FD) { 2968 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2969 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2970 } 2971 2972 SourceLocation getDotLoc() const { 2973 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2974 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2975 } 2976 2977 SourceLocation getFieldLoc() const { 2978 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2979 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2980 } 2981 2982 SourceLocation getLBracketLoc() const { 2983 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2984 "Only valid on an array or array-range designator"); 2985 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2986 } 2987 2988 SourceLocation getRBracketLoc() const { 2989 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2990 "Only valid on an array or array-range designator"); 2991 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2992 } 2993 2994 SourceLocation getEllipsisLoc() const { 2995 assert(Kind == ArrayRangeDesignator && 2996 "Only valid on an array-range designator"); 2997 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2998 } 2999 3000 unsigned getFirstExprIndex() const { 3001 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3002 "Only valid on an array or array-range designator"); 3003 return ArrayOrRange.Index; 3004 } 3005 3006 SourceLocation getStartLocation() const { 3007 if (Kind == FieldDesignator) 3008 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3009 else 3010 return getLBracketLoc(); 3011 } 3012 }; 3013 3014 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3015 unsigned NumDesignators, 3016 Expr **IndexExprs, unsigned NumIndexExprs, 3017 SourceLocation EqualOrColonLoc, 3018 bool GNUSyntax, Expr *Init); 3019 3020 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3021 3022 /// @brief Returns the number of designators in this initializer. 3023 unsigned size() const { return NumDesignators; } 3024 3025 // Iterator access to the designators. 3026 typedef Designator* designators_iterator; 3027 designators_iterator designators_begin() { return Designators; } 3028 designators_iterator designators_end() { 3029 return Designators + NumDesignators; 3030 } 3031 3032 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3033 3034 void setDesignators(ASTContext &C, const Designator *Desigs, 3035 unsigned NumDesigs); 3036 3037 Expr *getArrayIndex(const Designator& D); 3038 Expr *getArrayRangeStart(const Designator& D); 3039 Expr *getArrayRangeEnd(const Designator& D); 3040 3041 /// @brief Retrieve the location of the '=' that precedes the 3042 /// initializer value itself, if present. 3043 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3044 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3045 3046 /// @brief Determines whether this designated initializer used the 3047 /// deprecated GNU syntax for designated initializers. 3048 bool usesGNUSyntax() const { return GNUSyntax; } 3049 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3050 3051 /// @brief Retrieve the initializer value. 3052 Expr *getInit() const { 3053 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3054 } 3055 3056 void setInit(Expr *init) { 3057 *child_begin() = init; 3058 } 3059 3060 /// \brief Retrieve the total number of subexpressions in this 3061 /// designated initializer expression, including the actual 3062 /// initialized value and any expressions that occur within array 3063 /// and array-range designators. 3064 unsigned getNumSubExprs() const { return NumSubExprs; } 3065 3066 Expr *getSubExpr(unsigned Idx) { 3067 assert(Idx < NumSubExprs && "Subscript out of range"); 3068 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3069 Ptr += sizeof(DesignatedInitExpr); 3070 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3071 } 3072 3073 void setSubExpr(unsigned Idx, Expr *E) { 3074 assert(Idx < NumSubExprs && "Subscript out of range"); 3075 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3076 Ptr += sizeof(DesignatedInitExpr); 3077 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3078 } 3079 3080 /// \brief Replaces the designator at index @p Idx with the series 3081 /// of designators in [First, Last). 3082 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3083 const Designator *Last); 3084 3085 virtual SourceRange getSourceRange() const; 3086 3087 static bool classof(const Stmt *T) { 3088 return T->getStmtClass() == DesignatedInitExprClass; 3089 } 3090 static bool classof(const DesignatedInitExpr *) { return true; } 3091 3092 // Iterators 3093 virtual child_iterator child_begin(); 3094 virtual child_iterator child_end(); 3095}; 3096 3097/// \brief Represents an implicitly-generated value initialization of 3098/// an object of a given type. 3099/// 3100/// Implicit value initializations occur within semantic initializer 3101/// list expressions (InitListExpr) as placeholders for subobject 3102/// initializations not explicitly specified by the user. 3103/// 3104/// \see InitListExpr 3105class ImplicitValueInitExpr : public Expr { 3106public: 3107 explicit ImplicitValueInitExpr(QualType ty) 3108 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3109 3110 /// \brief Construct an empty implicit value initialization. 3111 explicit ImplicitValueInitExpr(EmptyShell Empty) 3112 : Expr(ImplicitValueInitExprClass, Empty) { } 3113 3114 static bool classof(const Stmt *T) { 3115 return T->getStmtClass() == ImplicitValueInitExprClass; 3116 } 3117 static bool classof(const ImplicitValueInitExpr *) { return true; } 3118 3119 virtual SourceRange getSourceRange() const { 3120 return SourceRange(); 3121 } 3122 3123 // Iterators 3124 virtual child_iterator child_begin(); 3125 virtual child_iterator child_end(); 3126}; 3127 3128 3129class ParenListExpr : public Expr { 3130 Stmt **Exprs; 3131 unsigned NumExprs; 3132 SourceLocation LParenLoc, RParenLoc; 3133 3134protected: 3135 virtual void DoDestroy(ASTContext& C); 3136 3137public: 3138 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3139 unsigned numexprs, SourceLocation rparenloc); 3140 3141 ~ParenListExpr() {} 3142 3143 /// \brief Build an empty paren list. 3144 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3145 3146 unsigned getNumExprs() const { return NumExprs; } 3147 3148 const Expr* getExpr(unsigned Init) const { 3149 assert(Init < getNumExprs() && "Initializer access out of range!"); 3150 return cast_or_null<Expr>(Exprs[Init]); 3151 } 3152 3153 Expr* getExpr(unsigned Init) { 3154 assert(Init < getNumExprs() && "Initializer access out of range!"); 3155 return cast_or_null<Expr>(Exprs[Init]); 3156 } 3157 3158 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3159 3160 SourceLocation getLParenLoc() const { return LParenLoc; } 3161 SourceLocation getRParenLoc() const { return RParenLoc; } 3162 3163 virtual SourceRange getSourceRange() const { 3164 return SourceRange(LParenLoc, RParenLoc); 3165 } 3166 static bool classof(const Stmt *T) { 3167 return T->getStmtClass() == ParenListExprClass; 3168 } 3169 static bool classof(const ParenListExpr *) { return true; } 3170 3171 // Iterators 3172 virtual child_iterator child_begin(); 3173 virtual child_iterator child_end(); 3174}; 3175 3176 3177//===----------------------------------------------------------------------===// 3178// Clang Extensions 3179//===----------------------------------------------------------------------===// 3180 3181 3182/// ExtVectorElementExpr - This represents access to specific elements of a 3183/// vector, and may occur on the left hand side or right hand side. For example 3184/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3185/// 3186/// Note that the base may have either vector or pointer to vector type, just 3187/// like a struct field reference. 3188/// 3189class ExtVectorElementExpr : public Expr { 3190 Stmt *Base; 3191 IdentifierInfo *Accessor; 3192 SourceLocation AccessorLoc; 3193public: 3194 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3195 SourceLocation loc) 3196 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3197 base->isValueDependent()), 3198 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3199 3200 /// \brief Build an empty vector element expression. 3201 explicit ExtVectorElementExpr(EmptyShell Empty) 3202 : Expr(ExtVectorElementExprClass, Empty) { } 3203 3204 const Expr *getBase() const { return cast<Expr>(Base); } 3205 Expr *getBase() { return cast<Expr>(Base); } 3206 void setBase(Expr *E) { Base = E; } 3207 3208 IdentifierInfo &getAccessor() const { return *Accessor; } 3209 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3210 3211 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3212 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3213 3214 /// getNumElements - Get the number of components being selected. 3215 unsigned getNumElements() const; 3216 3217 /// containsDuplicateElements - Return true if any element access is 3218 /// repeated. 3219 bool containsDuplicateElements() const; 3220 3221 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3222 /// aggregate Constant of ConstantInt(s). 3223 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3224 3225 virtual SourceRange getSourceRange() const { 3226 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3227 } 3228 3229 /// isArrow - Return true if the base expression is a pointer to vector, 3230 /// return false if the base expression is a vector. 3231 bool isArrow() const; 3232 3233 static bool classof(const Stmt *T) { 3234 return T->getStmtClass() == ExtVectorElementExprClass; 3235 } 3236 static bool classof(const ExtVectorElementExpr *) { return true; } 3237 3238 // Iterators 3239 virtual child_iterator child_begin(); 3240 virtual child_iterator child_end(); 3241}; 3242 3243 3244/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3245/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3246class BlockExpr : public Expr { 3247protected: 3248 BlockDecl *TheBlock; 3249 bool HasBlockDeclRefExprs; 3250public: 3251 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3252 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3253 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3254 3255 /// \brief Build an empty block expression. 3256 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3257 3258 const BlockDecl *getBlockDecl() const { return TheBlock; } 3259 BlockDecl *getBlockDecl() { return TheBlock; } 3260 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3261 3262 // Convenience functions for probing the underlying BlockDecl. 3263 SourceLocation getCaretLocation() const; 3264 const Stmt *getBody() const; 3265 Stmt *getBody(); 3266 3267 virtual SourceRange getSourceRange() const { 3268 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3269 } 3270 3271 /// getFunctionType - Return the underlying function type for this block. 3272 const FunctionType *getFunctionType() const; 3273 3274 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3275 /// inside of the block that reference values outside the block. 3276 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3277 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3278 3279 static bool classof(const Stmt *T) { 3280 return T->getStmtClass() == BlockExprClass; 3281 } 3282 static bool classof(const BlockExpr *) { return true; } 3283 3284 // Iterators 3285 virtual child_iterator child_begin(); 3286 virtual child_iterator child_end(); 3287}; 3288 3289/// BlockDeclRefExpr - A reference to a declared variable, function, 3290/// enum, etc. 3291class BlockDeclRefExpr : public Expr { 3292 ValueDecl *D; 3293 SourceLocation Loc; 3294 bool IsByRef : 1; 3295 bool ConstQualAdded : 1; 3296public: 3297 // FIXME: Fix type/value dependence! 3298 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3299 bool constAdded = false) 3300 : Expr(BlockDeclRefExprClass, t, false, false), D(d), Loc(l), IsByRef(ByRef), 3301 ConstQualAdded(constAdded) {} 3302 3303 // \brief Build an empty reference to a declared variable in a 3304 // block. 3305 explicit BlockDeclRefExpr(EmptyShell Empty) 3306 : Expr(BlockDeclRefExprClass, Empty) { } 3307 3308 ValueDecl *getDecl() { return D; } 3309 const ValueDecl *getDecl() const { return D; } 3310 void setDecl(ValueDecl *VD) { D = VD; } 3311 3312 SourceLocation getLocation() const { return Loc; } 3313 void setLocation(SourceLocation L) { Loc = L; } 3314 3315 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3316 3317 bool isByRef() const { return IsByRef; } 3318 void setByRef(bool BR) { IsByRef = BR; } 3319 3320 bool isConstQualAdded() const { return ConstQualAdded; } 3321 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3322 3323 static bool classof(const Stmt *T) { 3324 return T->getStmtClass() == BlockDeclRefExprClass; 3325 } 3326 static bool classof(const BlockDeclRefExpr *) { return true; } 3327 3328 // Iterators 3329 virtual child_iterator child_begin(); 3330 virtual child_iterator child_end(); 3331}; 3332 3333} // end namespace clang 3334 3335#endif 3336