Expr.h revision 0745d0a648b75bd304045309276c70a755adaafb
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 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 166 /// does not have an incomplete type, does not have a const-qualified type, 167 /// and if it is a structure or union, does not have any member (including, 168 /// recursively, any member or element of all contained aggregates or unions) 169 /// with a const-qualified type. 170 /// 171 /// \param Loc [in] [out] - A source location which *may* be filled 172 /// in with the location of the expression making this a 173 /// non-modifiable lvalue, if specified. 174 enum isModifiableLvalueResult { 175 MLV_Valid, 176 MLV_NotObjectType, 177 MLV_IncompleteVoidType, 178 MLV_DuplicateVectorComponents, 179 MLV_InvalidExpression, 180 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 181 MLV_IncompleteType, 182 MLV_ConstQualified, 183 MLV_ArrayType, 184 MLV_NotBlockQualified, 185 MLV_ReadonlyProperty, 186 MLV_NoSetterProperty, 187 MLV_MemberFunction, 188 MLV_SubObjCPropertySetting, 189 MLV_ClassTemporary 190 }; 191 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 192 SourceLocation *Loc = 0) const; 193 194 /// \brief The return type of classify(). Represents the C++0x expression 195 /// taxonomy. 196 class Classification { 197 public: 198 /// \brief The various classification results. Most of these mean prvalue. 199 enum Kinds { 200 CL_LValue, 201 CL_XValue, 202 CL_Function, // Functions cannot be lvalues in C. 203 CL_Void, // Void cannot be an lvalue in C. 204 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 205 CL_MemberFunction, // An expression referring to a member function 206 CL_SubObjCPropertySetting, 207 CL_ClassTemporary, // A prvalue of class type 208 CL_PRValue // A prvalue for any other reason, of any other type 209 }; 210 /// \brief The results of modification testing. 211 enum ModifiableType { 212 CM_Untested, // testModifiable was false. 213 CM_Modifiable, 214 CM_RValue, // Not modifiable because it's an rvalue 215 CM_Function, // Not modifiable because it's a function; C++ only 216 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 217 CM_NotBlockQualified, // Not captured in the closure 218 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 219 CM_ConstQualified, 220 CM_ArrayType, 221 CM_IncompleteType 222 }; 223 224 private: 225 friend class Expr; 226 227 unsigned short Kind; 228 unsigned short Modifiable; 229 230 explicit Classification(Kinds k, ModifiableType m) 231 : Kind(k), Modifiable(m) 232 {} 233 234 public: 235 Classification() {} 236 237 Kinds getKind() const { return static_cast<Kinds>(Kind); } 238 ModifiableType getModifiable() const { 239 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 240 return static_cast<ModifiableType>(Modifiable); 241 } 242 bool isLValue() const { return Kind == CL_LValue; } 243 bool isXValue() const { return Kind == CL_XValue; } 244 bool isGLValue() const { return Kind <= CL_XValue; } 245 bool isPRValue() const { return Kind >= CL_Function; } 246 bool isRValue() const { return Kind >= CL_XValue; } 247 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 248 }; 249 /// \brief classify - Classify this expression according to the C++0x 250 /// expression taxonomy. 251 /// 252 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 253 /// old lvalue vs rvalue. This function determines the type of expression this 254 /// is. There are three expression types: 255 /// - lvalues are classical lvalues as in C++03. 256 /// - prvalues are equivalent to rvalues in C++03. 257 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 258 /// function returning an rvalue reference. 259 /// lvalues and xvalues are collectively referred to as glvalues, while 260 /// prvalues and xvalues together form rvalues. 261 /// If a 262 Classification Classify(ASTContext &Ctx) const { 263 return ClassifyImpl(Ctx, 0); 264 } 265 266 /// \brief classifyModifiable - Classify this expression according to the 267 /// C++0x expression taxonomy, and see if it is valid on the left side 268 /// of an assignment. 269 /// 270 /// This function extends classify in that it also tests whether the 271 /// expression is modifiable (C99 6.3.2.1p1). 272 /// \param Loc A source location that might be filled with a relevant location 273 /// if the expression is not modifiable. 274 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 275 return ClassifyImpl(Ctx, &Loc); 276 } 277 278private: 279 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 280 281public: 282 283 /// \brief If this expression refers to a bit-field, retrieve the 284 /// declaration of that bit-field. 285 FieldDecl *getBitField(); 286 287 const FieldDecl *getBitField() const { 288 return const_cast<Expr*>(this)->getBitField(); 289 } 290 291 /// \brief Returns whether this expression refers to a vector element. 292 bool refersToVectorElement() const; 293 294 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 295 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 296 /// but also int expressions which are produced by things like comparisons in 297 /// C. 298 bool isKnownToHaveBooleanValue() const; 299 300 /// isIntegerConstantExpr - Return true if this expression is a valid integer 301 /// constant expression, and, if so, return its value in Result. If not a 302 /// valid i-c-e, return false and fill in Loc (if specified) with the location 303 /// of the invalid expression. 304 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 305 SourceLocation *Loc = 0, 306 bool isEvaluated = true) const; 307 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 308 llvm::APSInt X; 309 return isIntegerConstantExpr(X, Ctx, Loc); 310 } 311 /// isConstantInitializer - Returns true if this expression is a constant 312 /// initializer, which can be emitted at compile-time. 313 bool isConstantInitializer(ASTContext &Ctx) const; 314 315 /// EvalResult is a struct with detailed info about an evaluated expression. 316 struct EvalResult { 317 /// Val - This is the value the expression can be folded to. 318 APValue Val; 319 320 /// HasSideEffects - Whether the evaluated expression has side effects. 321 /// For example, (f() && 0) can be folded, but it still has side effects. 322 bool HasSideEffects; 323 324 /// Diag - If the expression is unfoldable, then Diag contains a note 325 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 326 /// position for the error, and DiagExpr is the expression that caused 327 /// the error. 328 /// If the expression is foldable, but not an integer constant expression, 329 /// Diag contains a note diagnostic that describes why it isn't an integer 330 /// constant expression. If the expression *is* an integer constant 331 /// expression, then Diag will be zero. 332 unsigned Diag; 333 const Expr *DiagExpr; 334 SourceLocation DiagLoc; 335 336 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 337 338 // isGlobalLValue - Return true if the evaluated lvalue expression 339 // is global. 340 bool isGlobalLValue() const; 341 // hasSideEffects - Return true if the evaluated expression has 342 // side effects. 343 bool hasSideEffects() const { 344 return HasSideEffects; 345 } 346 }; 347 348 /// Evaluate - Return true if this is a constant which we can fold using 349 /// any crazy technique (that has nothing to do with language standards) that 350 /// we want to. If this function returns true, it returns the folded constant 351 /// in Result. 352 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 353 354 /// EvaluateAsBooleanCondition - Return true if this is a constant 355 /// which we we can fold and convert to a boolean condition using 356 /// any crazy technique that we want to. 357 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 358 359 /// isEvaluatable - Call Evaluate to see if this expression can be constant 360 /// folded, but discard the result. 361 bool isEvaluatable(ASTContext &Ctx) const; 362 363 /// HasSideEffects - This routine returns true for all those expressions 364 /// which must be evaluated each time and must not be optimization away 365 /// or evaluated at compile time. Example is a function call, volatile 366 /// variable read. 367 bool HasSideEffects(ASTContext &Ctx) const; 368 369 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 370 /// must be called on an expression that constant folds to an integer. 371 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 372 373 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 374 /// with link time known address. 375 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 376 377 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 378 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 379 380 /// \brief Enumeration used to describe how \c isNullPointerConstant() 381 /// should cope with value-dependent expressions. 382 enum NullPointerConstantValueDependence { 383 /// \brief Specifies that the expression should never be value-dependent. 384 NPC_NeverValueDependent = 0, 385 386 /// \brief Specifies that a value-dependent expression of integral or 387 /// dependent type should be considered a null pointer constant. 388 NPC_ValueDependentIsNull, 389 390 /// \brief Specifies that a value-dependent expression should be considered 391 /// to never be a null pointer constant. 392 NPC_ValueDependentIsNotNull 393 }; 394 395 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 396 /// integer constant expression with the value zero, or if this is one that is 397 /// cast to void*. 398 bool isNullPointerConstant(ASTContext &Ctx, 399 NullPointerConstantValueDependence NPC) const; 400 401 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 402 /// write barrier. 403 bool isOBJCGCCandidate(ASTContext &Ctx) const; 404 405 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 406 /// its subexpression. If that subexpression is also a ParenExpr, 407 /// then this method recursively returns its subexpression, and so forth. 408 /// Otherwise, the method returns the current Expr. 409 Expr *IgnoreParens(); 410 411 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 412 /// or CastExprs, returning their operand. 413 Expr *IgnoreParenCasts(); 414 415 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 416 /// ParenExpr or ImplicitCastExprs, returning their operand. 417 Expr *IgnoreParenImpCasts(); 418 419 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 420 /// value (including ptr->int casts of the same size). Strip off any 421 /// ParenExpr or CastExprs, returning their operand. 422 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 423 424 /// \brief Determine whether this expression is a default function argument. 425 /// 426 /// Default arguments are implicitly generated in the abstract syntax tree 427 /// by semantic analysis for function calls, object constructions, etc. in 428 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 429 /// this routine also looks through any implicit casts to determine whether 430 /// the expression is a default argument. 431 bool isDefaultArgument() const; 432 433 /// \brief Determine whether this expression directly creates a 434 /// temporary object (of class type). 435 bool isTemporaryObject() const { return getTemporaryObject() != 0; } 436 437 /// \brief If this expression directly creates a temporary object of 438 /// class type, return the expression that actually constructs that 439 /// temporary object. 440 const Expr *getTemporaryObject() const; 441 442 const Expr *IgnoreParens() const { 443 return const_cast<Expr*>(this)->IgnoreParens(); 444 } 445 const Expr *IgnoreParenCasts() const { 446 return const_cast<Expr*>(this)->IgnoreParenCasts(); 447 } 448 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 449 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 450 } 451 452 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 453 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 454 455 static bool classof(const Stmt *T) { 456 return T->getStmtClass() >= firstExprConstant && 457 T->getStmtClass() <= lastExprConstant; 458 } 459 static bool classof(const Expr *) { return true; } 460}; 461 462 463//===----------------------------------------------------------------------===// 464// Primary Expressions. 465//===----------------------------------------------------------------------===// 466 467/// \brief Represents the qualifier that may precede a C++ name, e.g., the 468/// "std::" in "std::sort". 469struct NameQualifier { 470 /// \brief The nested name specifier. 471 NestedNameSpecifier *NNS; 472 473 /// \brief The source range covered by the nested name specifier. 474 SourceRange Range; 475}; 476 477/// \brief Represents an explicit template argument list in C++, e.g., 478/// the "<int>" in "sort<int>". 479struct ExplicitTemplateArgumentList { 480 /// \brief The source location of the left angle bracket ('<'); 481 SourceLocation LAngleLoc; 482 483 /// \brief The source location of the right angle bracket ('>'); 484 SourceLocation RAngleLoc; 485 486 /// \brief The number of template arguments in TemplateArgs. 487 /// The actual template arguments (if any) are stored after the 488 /// ExplicitTemplateArgumentList structure. 489 unsigned NumTemplateArgs; 490 491 /// \brief Retrieve the template arguments 492 TemplateArgumentLoc *getTemplateArgs() { 493 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 494 } 495 496 /// \brief Retrieve the template arguments 497 const TemplateArgumentLoc *getTemplateArgs() const { 498 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 499 } 500 501 void initializeFrom(const TemplateArgumentListInfo &List); 502 void copyInto(TemplateArgumentListInfo &List) const; 503 static std::size_t sizeFor(unsigned NumTemplateArgs); 504 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 505}; 506 507/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 508/// enum, etc. 509class DeclRefExpr : public Expr { 510 enum { 511 // Flag on DecoratedD that specifies when this declaration reference 512 // expression has a C++ nested-name-specifier. 513 HasQualifierFlag = 0x01, 514 // Flag on DecoratedD that specifies when this declaration reference 515 // expression has an explicit C++ template argument list. 516 HasExplicitTemplateArgumentListFlag = 0x02 517 }; 518 519 // DecoratedD - The declaration that we are referencing, plus two bits to 520 // indicate whether (1) the declaration's name was explicitly qualified and 521 // (2) the declaration's name was followed by an explicit template 522 // argument list. 523 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 524 525 // Loc - The location of the declaration name itself. 526 SourceLocation Loc; 527 528 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 529 NameQualifier *getNameQualifier() { 530 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 531 return 0; 532 533 return reinterpret_cast<NameQualifier *> (this + 1); 534 } 535 536 /// \brief Retrieve the qualifier that preceded the member name, if any. 537 const NameQualifier *getNameQualifier() const { 538 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 539 } 540 541 /// \brief Retrieve the explicit template argument list that followed the 542 /// member template name, if any. 543 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 544 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 545 return 0; 546 547 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 548 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 549 550 return reinterpret_cast<ExplicitTemplateArgumentList *>( 551 getNameQualifier() + 1); 552 } 553 554 /// \brief Retrieve the explicit template argument list that followed the 555 /// member template name, if any. 556 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 557 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 558 } 559 560 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 561 ValueDecl *D, SourceLocation NameLoc, 562 const TemplateArgumentListInfo *TemplateArgs, 563 QualType T); 564 565protected: 566 /// \brief Computes the type- and value-dependence flags for this 567 /// declaration reference expression. 568 void computeDependence(); 569 570 DeclRefExpr(StmtClass SC, ValueDecl *d, QualType t, SourceLocation l) : 571 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 572 computeDependence(); 573 } 574 575public: 576 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 577 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 578 computeDependence(); 579 } 580 581 /// \brief Construct an empty declaration reference expression. 582 explicit DeclRefExpr(EmptyShell Empty) 583 : Expr(DeclRefExprClass, Empty) { } 584 585 static DeclRefExpr *Create(ASTContext &Context, 586 NestedNameSpecifier *Qualifier, 587 SourceRange QualifierRange, 588 ValueDecl *D, 589 SourceLocation NameLoc, 590 QualType T, 591 const TemplateArgumentListInfo *TemplateArgs = 0); 592 593 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 594 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 595 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 596 597 SourceLocation getLocation() const { return Loc; } 598 void setLocation(SourceLocation L) { Loc = L; } 599 virtual SourceRange getSourceRange() const; 600 601 /// \brief Determine whether this declaration reference was preceded by a 602 /// C++ nested-name-specifier, e.g., \c N::foo. 603 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 604 605 /// \brief If the name was qualified, retrieves the source range of 606 /// the nested-name-specifier that precedes the name. Otherwise, 607 /// returns an empty source range. 608 SourceRange getQualifierRange() const { 609 if (!hasQualifier()) 610 return SourceRange(); 611 612 return getNameQualifier()->Range; 613 } 614 615 /// \brief If the name was qualified, retrieves the nested-name-specifier 616 /// that precedes the name. Otherwise, returns NULL. 617 NestedNameSpecifier *getQualifier() const { 618 if (!hasQualifier()) 619 return 0; 620 621 return getNameQualifier()->NNS; 622 } 623 624 /// \brief Determines whether this member expression actually had a C++ 625 /// template argument list explicitly specified, e.g., x.f<int>. 626 bool hasExplicitTemplateArgumentList() const { 627 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 628 } 629 630 /// \brief Copies the template arguments (if present) into the given 631 /// structure. 632 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 633 if (hasExplicitTemplateArgumentList()) 634 getExplicitTemplateArgumentList()->copyInto(List); 635 } 636 637 /// \brief Retrieve the location of the left angle bracket following the 638 /// member name ('<'), if any. 639 SourceLocation getLAngleLoc() const { 640 if (!hasExplicitTemplateArgumentList()) 641 return SourceLocation(); 642 643 return getExplicitTemplateArgumentList()->LAngleLoc; 644 } 645 646 /// \brief Retrieve the template arguments provided as part of this 647 /// template-id. 648 const TemplateArgumentLoc *getTemplateArgs() const { 649 if (!hasExplicitTemplateArgumentList()) 650 return 0; 651 652 return getExplicitTemplateArgumentList()->getTemplateArgs(); 653 } 654 655 /// \brief Retrieve the number of template arguments provided as part of this 656 /// template-id. 657 unsigned getNumTemplateArgs() const { 658 if (!hasExplicitTemplateArgumentList()) 659 return 0; 660 661 return getExplicitTemplateArgumentList()->NumTemplateArgs; 662 } 663 664 /// \brief Retrieve the location of the right angle bracket following the 665 /// template arguments ('>'). 666 SourceLocation getRAngleLoc() const { 667 if (!hasExplicitTemplateArgumentList()) 668 return SourceLocation(); 669 670 return getExplicitTemplateArgumentList()->RAngleLoc; 671 } 672 673 static bool classof(const Stmt *T) { 674 return T->getStmtClass() == DeclRefExprClass; 675 } 676 static bool classof(const DeclRefExpr *) { return true; } 677 678 // Iterators 679 virtual child_iterator child_begin(); 680 virtual child_iterator child_end(); 681}; 682 683/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 684class PredefinedExpr : public Expr { 685public: 686 enum IdentType { 687 Func, 688 Function, 689 PrettyFunction, 690 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 691 /// 'virtual' keyword is omitted for virtual member functions. 692 PrettyFunctionNoVirtual 693 }; 694 695private: 696 SourceLocation Loc; 697 IdentType Type; 698public: 699 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 700 : Expr(PredefinedExprClass, type, type->isDependentType(), 701 type->isDependentType()), Loc(l), Type(IT) {} 702 703 /// \brief Construct an empty predefined expression. 704 explicit PredefinedExpr(EmptyShell Empty) 705 : Expr(PredefinedExprClass, Empty) { } 706 707 IdentType getIdentType() const { return Type; } 708 void setIdentType(IdentType IT) { Type = IT; } 709 710 SourceLocation getLocation() const { return Loc; } 711 void setLocation(SourceLocation L) { Loc = L; } 712 713 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 714 715 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 716 717 static bool classof(const Stmt *T) { 718 return T->getStmtClass() == PredefinedExprClass; 719 } 720 static bool classof(const PredefinedExpr *) { return true; } 721 722 // Iterators 723 virtual child_iterator child_begin(); 724 virtual child_iterator child_end(); 725}; 726 727class IntegerLiteral : public Expr { 728 llvm::APInt Value; 729 SourceLocation Loc; 730public: 731 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 732 // or UnsignedLongLongTy 733 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 734 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 735 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 736 } 737 738 /// \brief Construct an empty integer literal. 739 explicit IntegerLiteral(EmptyShell Empty) 740 : Expr(IntegerLiteralClass, Empty) { } 741 742 const llvm::APInt &getValue() const { return Value; } 743 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 744 745 /// \brief Retrieve the location of the literal. 746 SourceLocation getLocation() const { return Loc; } 747 748 void setValue(const llvm::APInt &Val) { Value = Val; } 749 void setLocation(SourceLocation Location) { Loc = Location; } 750 751 static bool classof(const Stmt *T) { 752 return T->getStmtClass() == IntegerLiteralClass; 753 } 754 static bool classof(const IntegerLiteral *) { return true; } 755 756 // Iterators 757 virtual child_iterator child_begin(); 758 virtual child_iterator child_end(); 759}; 760 761class CharacterLiteral : public Expr { 762 unsigned Value; 763 SourceLocation Loc; 764 bool IsWide; 765public: 766 // type should be IntTy 767 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 768 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 769 IsWide(iswide) { 770 } 771 772 /// \brief Construct an empty character literal. 773 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 774 775 SourceLocation getLocation() const { return Loc; } 776 bool isWide() const { return IsWide; } 777 778 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 779 780 unsigned getValue() const { return Value; } 781 782 void setLocation(SourceLocation Location) { Loc = Location; } 783 void setWide(bool W) { IsWide = W; } 784 void setValue(unsigned Val) { Value = Val; } 785 786 static bool classof(const Stmt *T) { 787 return T->getStmtClass() == CharacterLiteralClass; 788 } 789 static bool classof(const CharacterLiteral *) { return true; } 790 791 // Iterators 792 virtual child_iterator child_begin(); 793 virtual child_iterator child_end(); 794}; 795 796class FloatingLiteral : public Expr { 797 llvm::APFloat Value; 798 bool IsExact : 1; 799 SourceLocation Loc; 800public: 801 FloatingLiteral(const llvm::APFloat &V, bool isexact, 802 QualType Type, SourceLocation L) 803 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 804 IsExact(isexact), Loc(L) {} 805 806 /// \brief Construct an empty floating-point literal. 807 explicit FloatingLiteral(EmptyShell Empty) 808 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 809 810 const llvm::APFloat &getValue() const { return Value; } 811 void setValue(const llvm::APFloat &Val) { Value = Val; } 812 813 bool isExact() const { return IsExact; } 814 void setExact(bool E) { IsExact = E; } 815 816 /// getValueAsApproximateDouble - This returns the value as an inaccurate 817 /// double. Note that this may cause loss of precision, but is useful for 818 /// debugging dumps, etc. 819 double getValueAsApproximateDouble() const; 820 821 SourceLocation getLocation() const { return Loc; } 822 void setLocation(SourceLocation L) { Loc = L; } 823 824 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 825 826 static bool classof(const Stmt *T) { 827 return T->getStmtClass() == FloatingLiteralClass; 828 } 829 static bool classof(const FloatingLiteral *) { return true; } 830 831 // Iterators 832 virtual child_iterator child_begin(); 833 virtual child_iterator child_end(); 834}; 835 836/// ImaginaryLiteral - We support imaginary integer and floating point literals, 837/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 838/// IntegerLiteral classes. Instances of this class always have a Complex type 839/// whose element type matches the subexpression. 840/// 841class ImaginaryLiteral : public Expr { 842 Stmt *Val; 843public: 844 ImaginaryLiteral(Expr *val, QualType Ty) 845 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 846 847 /// \brief Build an empty imaginary literal. 848 explicit ImaginaryLiteral(EmptyShell Empty) 849 : Expr(ImaginaryLiteralClass, Empty) { } 850 851 const Expr *getSubExpr() const { return cast<Expr>(Val); } 852 Expr *getSubExpr() { return cast<Expr>(Val); } 853 void setSubExpr(Expr *E) { Val = E; } 854 855 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 856 static bool classof(const Stmt *T) { 857 return T->getStmtClass() == ImaginaryLiteralClass; 858 } 859 static bool classof(const ImaginaryLiteral *) { return true; } 860 861 // Iterators 862 virtual child_iterator child_begin(); 863 virtual child_iterator child_end(); 864}; 865 866/// StringLiteral - This represents a string literal expression, e.g. "foo" 867/// or L"bar" (wide strings). The actual string is returned by getStrData() 868/// is NOT null-terminated, and the length of the string is determined by 869/// calling getByteLength(). The C type for a string is always a 870/// ConstantArrayType. In C++, the char type is const qualified, in C it is 871/// not. 872/// 873/// Note that strings in C can be formed by concatenation of multiple string 874/// literal pptokens in translation phase #6. This keeps track of the locations 875/// of each of these pieces. 876/// 877/// Strings in C can also be truncated and extended by assigning into arrays, 878/// e.g. with constructs like: 879/// char X[2] = "foobar"; 880/// In this case, getByteLength() will return 6, but the string literal will 881/// have type "char[2]". 882class StringLiteral : public Expr { 883 const char *StrData; 884 unsigned ByteLength; 885 bool IsWide; 886 unsigned NumConcatenated; 887 SourceLocation TokLocs[1]; 888 889 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 890 891protected: 892 virtual void DoDestroy(ASTContext &C); 893 894public: 895 /// This is the "fully general" constructor that allows representation of 896 /// strings formed from multiple concatenated tokens. 897 static StringLiteral *Create(ASTContext &C, const char *StrData, 898 unsigned ByteLength, bool Wide, QualType Ty, 899 const SourceLocation *Loc, unsigned NumStrs); 900 901 /// Simple constructor for string literals made from one token. 902 static StringLiteral *Create(ASTContext &C, const char *StrData, 903 unsigned ByteLength, 904 bool Wide, QualType Ty, SourceLocation Loc) { 905 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 906 } 907 908 /// \brief Construct an empty string literal. 909 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 910 911 llvm::StringRef getString() const { 912 return llvm::StringRef(StrData, ByteLength); 913 } 914 // FIXME: These are deprecated, replace with StringRef. 915 const char *getStrData() const { return StrData; } 916 unsigned getByteLength() const { return ByteLength; } 917 918 /// \brief Sets the string data to the given string data. 919 void setString(ASTContext &C, llvm::StringRef Str); 920 921 bool isWide() const { return IsWide; } 922 void setWide(bool W) { IsWide = W; } 923 924 bool containsNonAsciiOrNull() const { 925 llvm::StringRef Str = getString(); 926 for (unsigned i = 0, e = Str.size(); i != e; ++i) 927 if (!isascii(Str[i]) || !Str[i]) 928 return true; 929 return false; 930 } 931 /// getNumConcatenated - Get the number of string literal tokens that were 932 /// concatenated in translation phase #6 to form this string literal. 933 unsigned getNumConcatenated() const { return NumConcatenated; } 934 935 SourceLocation getStrTokenLoc(unsigned TokNum) const { 936 assert(TokNum < NumConcatenated && "Invalid tok number"); 937 return TokLocs[TokNum]; 938 } 939 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 940 assert(TokNum < NumConcatenated && "Invalid tok number"); 941 TokLocs[TokNum] = L; 942 } 943 944 typedef const SourceLocation *tokloc_iterator; 945 tokloc_iterator tokloc_begin() const { return TokLocs; } 946 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 947 948 virtual SourceRange getSourceRange() const { 949 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 950 } 951 static bool classof(const Stmt *T) { 952 return T->getStmtClass() == StringLiteralClass; 953 } 954 static bool classof(const StringLiteral *) { return true; } 955 956 // Iterators 957 virtual child_iterator child_begin(); 958 virtual child_iterator child_end(); 959}; 960 961/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 962/// AST node is only formed if full location information is requested. 963class ParenExpr : public Expr { 964 SourceLocation L, R; 965 Stmt *Val; 966public: 967 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 968 : Expr(ParenExprClass, val->getType(), 969 val->isTypeDependent(), val->isValueDependent()), 970 L(l), R(r), Val(val) {} 971 972 /// \brief Construct an empty parenthesized expression. 973 explicit ParenExpr(EmptyShell Empty) 974 : Expr(ParenExprClass, Empty) { } 975 976 const Expr *getSubExpr() const { return cast<Expr>(Val); } 977 Expr *getSubExpr() { return cast<Expr>(Val); } 978 void setSubExpr(Expr *E) { Val = E; } 979 980 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 981 982 /// \brief Get the location of the left parentheses '('. 983 SourceLocation getLParen() const { return L; } 984 void setLParen(SourceLocation Loc) { L = Loc; } 985 986 /// \brief Get the location of the right parentheses ')'. 987 SourceLocation getRParen() const { return R; } 988 void setRParen(SourceLocation Loc) { R = Loc; } 989 990 static bool classof(const Stmt *T) { 991 return T->getStmtClass() == ParenExprClass; 992 } 993 static bool classof(const ParenExpr *) { return true; } 994 995 // Iterators 996 virtual child_iterator child_begin(); 997 virtual child_iterator child_end(); 998}; 999 1000 1001/// UnaryOperator - This represents the unary-expression's (except sizeof and 1002/// alignof), the postinc/postdec operators from postfix-expression, and various 1003/// extensions. 1004/// 1005/// Notes on various nodes: 1006/// 1007/// Real/Imag - These return the real/imag part of a complex operand. If 1008/// applied to a non-complex value, the former returns its operand and the 1009/// later returns zero in the type of the operand. 1010/// 1011/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 1012/// subexpression is a compound literal with the various MemberExpr and 1013/// ArraySubscriptExpr's applied to it. (This is only used in C) 1014/// 1015class UnaryOperator : public Expr { 1016public: 1017 // Note that additions to this should also update the StmtVisitor class. 1018 enum Opcode { 1019 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 1020 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 1021 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 1022 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 1023 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 1024 Real, Imag, // "__real expr"/"__imag expr" Extension. 1025 Extension, // __extension__ marker. 1026 OffsetOf // __builtin_offsetof 1027 }; 1028private: 1029 Stmt *Val; 1030 Opcode Opc; 1031 SourceLocation Loc; 1032public: 1033 1034 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 1035 : Expr(UnaryOperatorClass, type, 1036 input->isTypeDependent() && opc != OffsetOf, 1037 input->isValueDependent()), 1038 Val(input), Opc(opc), Loc(l) {} 1039 1040 /// \brief Build an empty unary operator. 1041 explicit UnaryOperator(EmptyShell Empty) 1042 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 1043 1044 Opcode getOpcode() const { return Opc; } 1045 void setOpcode(Opcode O) { Opc = O; } 1046 1047 Expr *getSubExpr() const { return cast<Expr>(Val); } 1048 void setSubExpr(Expr *E) { Val = E; } 1049 1050 /// getOperatorLoc - Return the location of the operator. 1051 SourceLocation getOperatorLoc() const { return Loc; } 1052 void setOperatorLoc(SourceLocation L) { Loc = L; } 1053 1054 /// isPostfix - Return true if this is a postfix operation, like x++. 1055 static bool isPostfix(Opcode Op) { 1056 return Op == PostInc || Op == PostDec; 1057 } 1058 1059 /// isPostfix - Return true if this is a prefix operation, like --x. 1060 static bool isPrefix(Opcode Op) { 1061 return Op == PreInc || Op == PreDec; 1062 } 1063 1064 bool isPrefix() const { return isPrefix(Opc); } 1065 bool isPostfix() const { return isPostfix(Opc); } 1066 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 1067 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 1068 bool isOffsetOfOp() const { return Opc == OffsetOf; } 1069 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 1070 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 1071 1072 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1073 /// corresponds to, e.g. "sizeof" or "[pre]++" 1074 static const char *getOpcodeStr(Opcode Op); 1075 1076 /// \brief Retrieve the unary opcode that corresponds to the given 1077 /// overloaded operator. 1078 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1079 1080 /// \brief Retrieve the overloaded operator kind that corresponds to 1081 /// the given unary opcode. 1082 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1083 1084 virtual SourceRange getSourceRange() const { 1085 if (isPostfix()) 1086 return SourceRange(Val->getLocStart(), Loc); 1087 else 1088 return SourceRange(Loc, Val->getLocEnd()); 1089 } 1090 virtual SourceLocation getExprLoc() const { return Loc; } 1091 1092 static bool classof(const Stmt *T) { 1093 return T->getStmtClass() == UnaryOperatorClass; 1094 } 1095 static bool classof(const UnaryOperator *) { return true; } 1096 1097 // Iterators 1098 virtual child_iterator child_begin(); 1099 virtual child_iterator child_end(); 1100}; 1101 1102/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1103/// offsetof(record-type, member-designator). For example, given: 1104/// @code 1105/// struct S { 1106/// float f; 1107/// double d; 1108/// }; 1109/// struct T { 1110/// int i; 1111/// struct S s[10]; 1112/// }; 1113/// @endcode 1114/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1115 1116class OffsetOfExpr : public Expr { 1117public: 1118 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1119 class OffsetOfNode { 1120 public: 1121 /// \brief The kind of offsetof node we have. 1122 enum Kind { 1123 /// \brief An index into an array. 1124 Array = 0x00, 1125 /// \brief A field. 1126 Field = 0x01, 1127 /// \brief A field in a dependent type, known only by its name. 1128 Identifier = 0x02, 1129 /// \brief An implicit indirection through a C++ base class, when the 1130 /// field found is in a base class. 1131 Base = 0x03 1132 }; 1133 1134 private: 1135 enum { MaskBits = 2, Mask = 0x03 }; 1136 1137 /// \brief The source range that covers this part of the designator. 1138 SourceRange Range; 1139 1140 /// \brief The data describing the designator, which comes in three 1141 /// different forms, depending on the lower two bits. 1142 /// - An unsigned index into the array of Expr*'s stored after this node 1143 /// in memory, for [constant-expression] designators. 1144 /// - A FieldDecl*, for references to a known field. 1145 /// - An IdentifierInfo*, for references to a field with a given name 1146 /// when the class type is dependent. 1147 /// - A CXXBaseSpecifier*, for references that look at a field in a 1148 /// base class. 1149 uintptr_t Data; 1150 1151 public: 1152 /// \brief Create an offsetof node that refers to an array element. 1153 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1154 SourceLocation RBracketLoc) 1155 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1156 1157 /// \brief Create an offsetof node that refers to a field. 1158 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1159 SourceLocation NameLoc) 1160 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1161 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1162 1163 /// \brief Create an offsetof node that refers to an identifier. 1164 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1165 SourceLocation NameLoc) 1166 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1167 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1168 1169 /// \brief Create an offsetof node that refers into a C++ base class. 1170 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1171 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1172 1173 /// \brief Determine what kind of offsetof node this is. 1174 Kind getKind() const { 1175 return static_cast<Kind>(Data & Mask); 1176 } 1177 1178 /// \brief For an array element node, returns the index into the array 1179 /// of expressions. 1180 unsigned getArrayExprIndex() const { 1181 assert(getKind() == Array); 1182 return Data >> 2; 1183 } 1184 1185 /// \brief For a field offsetof node, returns the field. 1186 FieldDecl *getField() const { 1187 assert(getKind() == Field); 1188 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1189 } 1190 1191 /// \brief For a field or identifier offsetof node, returns the name of 1192 /// the field. 1193 IdentifierInfo *getFieldName() const; 1194 1195 /// \brief For a base class node, returns the base specifier. 1196 CXXBaseSpecifier *getBase() const { 1197 assert(getKind() == Base); 1198 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1199 } 1200 1201 /// \brief Retrieve the source range that covers this offsetof node. 1202 /// 1203 /// For an array element node, the source range contains the locations of 1204 /// the square brackets. For a field or identifier node, the source range 1205 /// contains the location of the period (if there is one) and the 1206 /// identifier. 1207 SourceRange getRange() const { return Range; } 1208 }; 1209 1210private: 1211 1212 SourceLocation OperatorLoc, RParenLoc; 1213 // Base type; 1214 TypeSourceInfo *TSInfo; 1215 // Number of sub-components (i.e. instances of OffsetOfNode). 1216 unsigned NumComps; 1217 // Number of sub-expressions (i.e. array subscript expressions). 1218 unsigned NumExprs; 1219 1220 OffsetOfExpr(ASTContext &C, QualType type, 1221 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1222 OffsetOfNode* compsPtr, unsigned numComps, 1223 Expr** exprsPtr, unsigned numExprs, 1224 SourceLocation RParenLoc); 1225 1226 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1227 : Expr(OffsetOfExprClass, EmptyShell()), 1228 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1229 1230public: 1231 1232 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1233 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1234 OffsetOfNode* compsPtr, unsigned numComps, 1235 Expr** exprsPtr, unsigned numExprs, 1236 SourceLocation RParenLoc); 1237 1238 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1239 unsigned NumComps, unsigned NumExprs); 1240 1241 /// getOperatorLoc - Return the location of the operator. 1242 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1243 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1244 1245 /// \brief Return the location of the right parentheses. 1246 SourceLocation getRParenLoc() const { return RParenLoc; } 1247 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1248 1249 TypeSourceInfo *getTypeSourceInfo() const { 1250 return TSInfo; 1251 } 1252 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1253 TSInfo = tsi; 1254 } 1255 1256 const OffsetOfNode &getComponent(unsigned Idx) { 1257 assert(Idx < NumComps && "Subscript out of range"); 1258 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1259 } 1260 1261 void setComponent(unsigned Idx, OffsetOfNode ON) { 1262 assert(Idx < NumComps && "Subscript out of range"); 1263 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1264 } 1265 1266 unsigned getNumComponents() const { 1267 return NumComps; 1268 } 1269 1270 Expr* getIndexExpr(unsigned Idx) { 1271 assert(Idx < NumExprs && "Subscript out of range"); 1272 return reinterpret_cast<Expr **>( 1273 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1274 } 1275 1276 void setIndexExpr(unsigned Idx, Expr* E) { 1277 assert(Idx < NumComps && "Subscript out of range"); 1278 reinterpret_cast<Expr **>( 1279 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1280 } 1281 1282 unsigned getNumExpressions() const { 1283 return NumExprs; 1284 } 1285 1286 virtual SourceRange getSourceRange() const { 1287 return SourceRange(OperatorLoc, RParenLoc); 1288 } 1289 1290 static bool classof(const Stmt *T) { 1291 return T->getStmtClass() == OffsetOfExprClass; 1292 } 1293 1294 static bool classof(const OffsetOfExpr *) { return true; } 1295 1296 // Iterators 1297 virtual child_iterator child_begin(); 1298 virtual child_iterator child_end(); 1299}; 1300 1301/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1302/// types and expressions. 1303class SizeOfAlignOfExpr : public Expr { 1304 bool isSizeof : 1; // true if sizeof, false if alignof. 1305 bool isType : 1; // true if operand is a type, false if an expression 1306 union { 1307 TypeSourceInfo *Ty; 1308 Stmt *Ex; 1309 } Argument; 1310 SourceLocation OpLoc, RParenLoc; 1311 1312protected: 1313 virtual void DoDestroy(ASTContext& C); 1314 1315public: 1316 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1317 QualType resultType, SourceLocation op, 1318 SourceLocation rp) : 1319 Expr(SizeOfAlignOfExprClass, resultType, 1320 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1321 // Value-dependent if the argument is type-dependent. 1322 TInfo->getType()->isDependentType()), 1323 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1324 Argument.Ty = TInfo; 1325 } 1326 1327 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1328 QualType resultType, SourceLocation op, 1329 SourceLocation rp) : 1330 Expr(SizeOfAlignOfExprClass, resultType, 1331 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1332 // Value-dependent if the argument is type-dependent. 1333 E->isTypeDependent()), 1334 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1335 Argument.Ex = E; 1336 } 1337 1338 /// \brief Construct an empty sizeof/alignof expression. 1339 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1340 : Expr(SizeOfAlignOfExprClass, Empty) { } 1341 1342 bool isSizeOf() const { return isSizeof; } 1343 void setSizeof(bool S) { isSizeof = S; } 1344 1345 bool isArgumentType() const { return isType; } 1346 QualType getArgumentType() const { 1347 return getArgumentTypeInfo()->getType(); 1348 } 1349 TypeSourceInfo *getArgumentTypeInfo() const { 1350 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1351 return Argument.Ty; 1352 } 1353 Expr *getArgumentExpr() { 1354 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1355 return static_cast<Expr*>(Argument.Ex); 1356 } 1357 const Expr *getArgumentExpr() const { 1358 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1359 } 1360 1361 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1362 void setArgument(TypeSourceInfo *TInfo) { 1363 Argument.Ty = TInfo; 1364 isType = true; 1365 } 1366 1367 /// Gets the argument type, or the type of the argument expression, whichever 1368 /// is appropriate. 1369 QualType getTypeOfArgument() const { 1370 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1371 } 1372 1373 SourceLocation getOperatorLoc() const { return OpLoc; } 1374 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1375 1376 SourceLocation getRParenLoc() const { return RParenLoc; } 1377 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1378 1379 virtual SourceRange getSourceRange() const { 1380 return SourceRange(OpLoc, RParenLoc); 1381 } 1382 1383 static bool classof(const Stmt *T) { 1384 return T->getStmtClass() == SizeOfAlignOfExprClass; 1385 } 1386 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1387 1388 // Iterators 1389 virtual child_iterator child_begin(); 1390 virtual child_iterator child_end(); 1391}; 1392 1393//===----------------------------------------------------------------------===// 1394// Postfix Operators. 1395//===----------------------------------------------------------------------===// 1396 1397/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1398class ArraySubscriptExpr : public Expr { 1399 enum { LHS, RHS, END_EXPR=2 }; 1400 Stmt* SubExprs[END_EXPR]; 1401 SourceLocation RBracketLoc; 1402public: 1403 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1404 SourceLocation rbracketloc) 1405 : Expr(ArraySubscriptExprClass, t, 1406 lhs->isTypeDependent() || rhs->isTypeDependent(), 1407 lhs->isValueDependent() || rhs->isValueDependent()), 1408 RBracketLoc(rbracketloc) { 1409 SubExprs[LHS] = lhs; 1410 SubExprs[RHS] = rhs; 1411 } 1412 1413 /// \brief Create an empty array subscript expression. 1414 explicit ArraySubscriptExpr(EmptyShell Shell) 1415 : Expr(ArraySubscriptExprClass, Shell) { } 1416 1417 /// An array access can be written A[4] or 4[A] (both are equivalent). 1418 /// - getBase() and getIdx() always present the normalized view: A[4]. 1419 /// In this case getBase() returns "A" and getIdx() returns "4". 1420 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1421 /// 4[A] getLHS() returns "4". 1422 /// Note: Because vector element access is also written A[4] we must 1423 /// predicate the format conversion in getBase and getIdx only on the 1424 /// the type of the RHS, as it is possible for the LHS to be a vector of 1425 /// integer type 1426 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1427 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1428 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1429 1430 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1431 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1432 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1433 1434 Expr *getBase() { 1435 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1436 } 1437 1438 const Expr *getBase() const { 1439 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1440 } 1441 1442 Expr *getIdx() { 1443 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1444 } 1445 1446 const Expr *getIdx() const { 1447 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1448 } 1449 1450 virtual SourceRange getSourceRange() const { 1451 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1452 } 1453 1454 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1455 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1456 1457 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1458 1459 static bool classof(const Stmt *T) { 1460 return T->getStmtClass() == ArraySubscriptExprClass; 1461 } 1462 static bool classof(const ArraySubscriptExpr *) { return true; } 1463 1464 // Iterators 1465 virtual child_iterator child_begin(); 1466 virtual child_iterator child_end(); 1467}; 1468 1469 1470/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1471/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1472/// while its subclasses may represent alternative syntax that (semantically) 1473/// results in a function call. For example, CXXOperatorCallExpr is 1474/// a subclass for overloaded operator calls that use operator syntax, e.g., 1475/// "str1 + str2" to resolve to a function call. 1476class CallExpr : public Expr { 1477 enum { FN=0, ARGS_START=1 }; 1478 Stmt **SubExprs; 1479 unsigned NumArgs; 1480 SourceLocation RParenLoc; 1481 1482protected: 1483 // This version of the constructor is for derived classes. 1484 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1485 QualType t, SourceLocation rparenloc); 1486 1487 virtual void DoDestroy(ASTContext& C); 1488 1489public: 1490 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1491 SourceLocation rparenloc); 1492 1493 /// \brief Build an empty call expression. 1494 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1495 1496 ~CallExpr() {} 1497 1498 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1499 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1500 void setCallee(Expr *F) { SubExprs[FN] = F; } 1501 1502 Decl *getCalleeDecl(); 1503 const Decl *getCalleeDecl() const { 1504 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1505 } 1506 1507 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1508 FunctionDecl *getDirectCallee(); 1509 const FunctionDecl *getDirectCallee() const { 1510 return const_cast<CallExpr*>(this)->getDirectCallee(); 1511 } 1512 1513 /// getNumArgs - Return the number of actual arguments to this call. 1514 /// 1515 unsigned getNumArgs() const { return NumArgs; } 1516 1517 /// getArg - Return the specified argument. 1518 Expr *getArg(unsigned Arg) { 1519 assert(Arg < NumArgs && "Arg access out of range!"); 1520 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1521 } 1522 const Expr *getArg(unsigned Arg) const { 1523 assert(Arg < NumArgs && "Arg access out of range!"); 1524 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1525 } 1526 1527 /// setArg - Set the specified argument. 1528 void setArg(unsigned Arg, Expr *ArgExpr) { 1529 assert(Arg < NumArgs && "Arg access out of range!"); 1530 SubExprs[Arg+ARGS_START] = ArgExpr; 1531 } 1532 1533 /// setNumArgs - This changes the number of arguments present in this call. 1534 /// Any orphaned expressions are deleted by this, and any new operands are set 1535 /// to null. 1536 void setNumArgs(ASTContext& C, unsigned NumArgs); 1537 1538 typedef ExprIterator arg_iterator; 1539 typedef ConstExprIterator const_arg_iterator; 1540 1541 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1542 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1543 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1544 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1545 1546 /// getNumCommas - Return the number of commas that must have been present in 1547 /// this function call. 1548 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1549 1550 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1551 /// not, return 0. 1552 unsigned isBuiltinCall(ASTContext &Context) const; 1553 1554 /// getCallReturnType - Get the return type of the call expr. This is not 1555 /// always the type of the expr itself, if the return type is a reference 1556 /// type. 1557 QualType getCallReturnType() const; 1558 1559 SourceLocation getRParenLoc() const { return RParenLoc; } 1560 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1561 1562 virtual SourceRange getSourceRange() const { 1563 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1564 } 1565 1566 static bool classof(const Stmt *T) { 1567 return T->getStmtClass() >= firstCallExprConstant && 1568 T->getStmtClass() <= lastCallExprConstant; 1569 } 1570 static bool classof(const CallExpr *) { return true; } 1571 1572 // Iterators 1573 virtual child_iterator child_begin(); 1574 virtual child_iterator child_end(); 1575}; 1576 1577/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1578/// 1579class MemberExpr : public Expr { 1580 /// Extra data stored in some member expressions. 1581 struct MemberNameQualifier : public NameQualifier { 1582 DeclAccessPair FoundDecl; 1583 }; 1584 1585 /// Base - the expression for the base pointer or structure references. In 1586 /// X.F, this is "X". 1587 Stmt *Base; 1588 1589 /// MemberDecl - This is the decl being referenced by the field/member name. 1590 /// In X.F, this is the decl referenced by F. 1591 ValueDecl *MemberDecl; 1592 1593 /// MemberLoc - This is the location of the member name. 1594 SourceLocation MemberLoc; 1595 1596 /// IsArrow - True if this is "X->F", false if this is "X.F". 1597 bool IsArrow : 1; 1598 1599 /// \brief True if this member expression used a nested-name-specifier to 1600 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1601 /// declaration. When true, a MemberNameQualifier 1602 /// structure is allocated immediately after the MemberExpr. 1603 bool HasQualifierOrFoundDecl : 1; 1604 1605 /// \brief True if this member expression specified a template argument list 1606 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1607 /// structure (and its TemplateArguments) are allocated immediately after 1608 /// the MemberExpr or, if the member expression also has a qualifier, after 1609 /// the MemberNameQualifier structure. 1610 bool HasExplicitTemplateArgumentList : 1; 1611 1612 /// \brief Retrieve the qualifier that preceded the member name, if any. 1613 MemberNameQualifier *getMemberQualifier() { 1614 assert(HasQualifierOrFoundDecl); 1615 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1616 } 1617 1618 /// \brief Retrieve the qualifier that preceded the member name, if any. 1619 const MemberNameQualifier *getMemberQualifier() const { 1620 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1621 } 1622 1623 /// \brief Retrieve the explicit template argument list that followed the 1624 /// member template name, if any. 1625 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1626 if (!HasExplicitTemplateArgumentList) 1627 return 0; 1628 1629 if (!HasQualifierOrFoundDecl) 1630 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1631 1632 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1633 getMemberQualifier() + 1); 1634 } 1635 1636 /// \brief Retrieve the explicit template argument list that followed the 1637 /// member template name, if any. 1638 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1639 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1640 } 1641 1642public: 1643 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1644 SourceLocation l, QualType ty) 1645 : Expr(MemberExprClass, ty, 1646 base->isTypeDependent(), base->isValueDependent()), 1647 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1648 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1649 1650 /// \brief Build an empty member reference expression. 1651 explicit MemberExpr(EmptyShell Empty) 1652 : Expr(MemberExprClass, Empty), HasQualifierOrFoundDecl(false), 1653 HasExplicitTemplateArgumentList(false) { } 1654 1655 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1656 NestedNameSpecifier *qual, SourceRange qualrange, 1657 ValueDecl *memberdecl, DeclAccessPair founddecl, 1658 SourceLocation l, 1659 const TemplateArgumentListInfo *targs, 1660 QualType ty); 1661 1662 void setBase(Expr *E) { Base = E; } 1663 Expr *getBase() const { return cast<Expr>(Base); } 1664 1665 /// \brief Retrieve the member declaration to which this expression refers. 1666 /// 1667 /// The returned declaration will either be a FieldDecl or (in C++) 1668 /// a CXXMethodDecl. 1669 ValueDecl *getMemberDecl() const { return MemberDecl; } 1670 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1671 1672 /// \brief Retrieves the declaration found by lookup. 1673 DeclAccessPair getFoundDecl() const { 1674 if (!HasQualifierOrFoundDecl) 1675 return DeclAccessPair::make(getMemberDecl(), 1676 getMemberDecl()->getAccess()); 1677 return getMemberQualifier()->FoundDecl; 1678 } 1679 1680 /// \brief Determines whether this member expression actually had 1681 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1682 /// x->Base::foo. 1683 bool hasQualifier() const { return getQualifier() != 0; } 1684 1685 /// \brief If the member name was qualified, retrieves the source range of 1686 /// the nested-name-specifier that precedes the member name. Otherwise, 1687 /// returns an empty source range. 1688 SourceRange getQualifierRange() const { 1689 if (!HasQualifierOrFoundDecl) 1690 return SourceRange(); 1691 1692 return getMemberQualifier()->Range; 1693 } 1694 1695 /// \brief If the member name was qualified, retrieves the 1696 /// nested-name-specifier that precedes the member name. Otherwise, returns 1697 /// NULL. 1698 NestedNameSpecifier *getQualifier() const { 1699 if (!HasQualifierOrFoundDecl) 1700 return 0; 1701 1702 return getMemberQualifier()->NNS; 1703 } 1704 1705 /// \brief Determines whether this member expression actually had a C++ 1706 /// template argument list explicitly specified, e.g., x.f<int>. 1707 bool hasExplicitTemplateArgumentList() const { 1708 return HasExplicitTemplateArgumentList; 1709 } 1710 1711 /// \brief Copies the template arguments (if present) into the given 1712 /// structure. 1713 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1714 if (hasExplicitTemplateArgumentList()) 1715 getExplicitTemplateArgumentList()->copyInto(List); 1716 } 1717 1718 /// \brief Retrieve the location of the left angle bracket following the 1719 /// member name ('<'), if any. 1720 SourceLocation getLAngleLoc() const { 1721 if (!HasExplicitTemplateArgumentList) 1722 return SourceLocation(); 1723 1724 return getExplicitTemplateArgumentList()->LAngleLoc; 1725 } 1726 1727 /// \brief Retrieve the template arguments provided as part of this 1728 /// template-id. 1729 const TemplateArgumentLoc *getTemplateArgs() const { 1730 if (!HasExplicitTemplateArgumentList) 1731 return 0; 1732 1733 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1734 } 1735 1736 /// \brief Retrieve the number of template arguments provided as part of this 1737 /// template-id. 1738 unsigned getNumTemplateArgs() const { 1739 if (!HasExplicitTemplateArgumentList) 1740 return 0; 1741 1742 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1743 } 1744 1745 /// \brief Retrieve the location of the right angle bracket following the 1746 /// template arguments ('>'). 1747 SourceLocation getRAngleLoc() const { 1748 if (!HasExplicitTemplateArgumentList) 1749 return SourceLocation(); 1750 1751 return getExplicitTemplateArgumentList()->RAngleLoc; 1752 } 1753 1754 bool isArrow() const { return IsArrow; } 1755 void setArrow(bool A) { IsArrow = A; } 1756 1757 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1758 /// location of 'F'. 1759 SourceLocation getMemberLoc() const { return MemberLoc; } 1760 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1761 1762 virtual SourceRange getSourceRange() const { 1763 // If we have an implicit base (like a C++ implicit this), 1764 // make sure not to return its location 1765 SourceLocation EndLoc = MemberLoc; 1766 if (HasExplicitTemplateArgumentList) 1767 EndLoc = getRAngleLoc(); 1768 1769 SourceLocation BaseLoc = getBase()->getLocStart(); 1770 if (BaseLoc.isInvalid()) 1771 return SourceRange(MemberLoc, EndLoc); 1772 return SourceRange(BaseLoc, EndLoc); 1773 } 1774 1775 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1776 1777 static bool classof(const Stmt *T) { 1778 return T->getStmtClass() == MemberExprClass; 1779 } 1780 static bool classof(const MemberExpr *) { return true; } 1781 1782 // Iterators 1783 virtual child_iterator child_begin(); 1784 virtual child_iterator child_end(); 1785}; 1786 1787/// CompoundLiteralExpr - [C99 6.5.2.5] 1788/// 1789class CompoundLiteralExpr : public Expr { 1790 /// LParenLoc - If non-null, this is the location of the left paren in a 1791 /// compound literal like "(int){4}". This can be null if this is a 1792 /// synthesized compound expression. 1793 SourceLocation LParenLoc; 1794 1795 /// The type as written. This can be an incomplete array type, in 1796 /// which case the actual expression type will be different. 1797 TypeSourceInfo *TInfo; 1798 Stmt *Init; 1799 bool FileScope; 1800public: 1801 // FIXME: Can compound literals be value-dependent? 1802 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1803 QualType T, Expr *init, bool fileScope) 1804 : Expr(CompoundLiteralExprClass, T, 1805 tinfo->getType()->isDependentType(), false), 1806 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1807 1808 /// \brief Construct an empty compound literal. 1809 explicit CompoundLiteralExpr(EmptyShell Empty) 1810 : Expr(CompoundLiteralExprClass, Empty) { } 1811 1812 const Expr *getInitializer() const { return cast<Expr>(Init); } 1813 Expr *getInitializer() { return cast<Expr>(Init); } 1814 void setInitializer(Expr *E) { Init = E; } 1815 1816 bool isFileScope() const { return FileScope; } 1817 void setFileScope(bool FS) { FileScope = FS; } 1818 1819 SourceLocation getLParenLoc() const { return LParenLoc; } 1820 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1821 1822 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1823 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1824 1825 virtual SourceRange getSourceRange() const { 1826 // FIXME: Init should never be null. 1827 if (!Init) 1828 return SourceRange(); 1829 if (LParenLoc.isInvalid()) 1830 return Init->getSourceRange(); 1831 return SourceRange(LParenLoc, Init->getLocEnd()); 1832 } 1833 1834 static bool classof(const Stmt *T) { 1835 return T->getStmtClass() == CompoundLiteralExprClass; 1836 } 1837 static bool classof(const CompoundLiteralExpr *) { return true; } 1838 1839 // Iterators 1840 virtual child_iterator child_begin(); 1841 virtual child_iterator child_end(); 1842}; 1843 1844/// CastExpr - Base class for type casts, including both implicit 1845/// casts (ImplicitCastExpr) and explicit casts that have some 1846/// representation in the source code (ExplicitCastExpr's derived 1847/// classes). 1848class CastExpr : public Expr { 1849public: 1850 /// CastKind - the kind of cast this represents. 1851 enum CastKind { 1852 /// CK_Unknown - Unknown cast kind. 1853 /// FIXME: The goal is to get rid of this and make all casts have a 1854 /// kind so that the AST client doesn't have to try to figure out what's 1855 /// going on. 1856 CK_Unknown, 1857 1858 /// CK_BitCast - Used for reinterpret_cast. 1859 CK_BitCast, 1860 1861 /// CK_NoOp - Used for const_cast. 1862 CK_NoOp, 1863 1864 /// CK_BaseToDerived - Base to derived class casts. 1865 CK_BaseToDerived, 1866 1867 /// CK_DerivedToBase - Derived to base class casts. 1868 CK_DerivedToBase, 1869 1870 /// CK_UncheckedDerivedToBase - Derived to base class casts that 1871 /// assume that the derived pointer is not null. 1872 CK_UncheckedDerivedToBase, 1873 1874 /// CK_Dynamic - Dynamic cast. 1875 CK_Dynamic, 1876 1877 /// CK_ToUnion - Cast to union (GCC extension). 1878 CK_ToUnion, 1879 1880 /// CK_ArrayToPointerDecay - Array to pointer decay. 1881 CK_ArrayToPointerDecay, 1882 1883 // CK_FunctionToPointerDecay - Function to pointer decay. 1884 CK_FunctionToPointerDecay, 1885 1886 /// CK_NullToMemberPointer - Null pointer to member pointer. 1887 CK_NullToMemberPointer, 1888 1889 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1890 /// member pointer in derived class. 1891 CK_BaseToDerivedMemberPointer, 1892 1893 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1894 /// member pointer in base class. 1895 CK_DerivedToBaseMemberPointer, 1896 1897 /// CK_UserDefinedConversion - Conversion using a user defined type 1898 /// conversion function. 1899 CK_UserDefinedConversion, 1900 1901 /// CK_ConstructorConversion - Conversion by constructor 1902 CK_ConstructorConversion, 1903 1904 /// CK_IntegralToPointer - Integral to pointer 1905 CK_IntegralToPointer, 1906 1907 /// CK_PointerToIntegral - Pointer to integral 1908 CK_PointerToIntegral, 1909 1910 /// CK_ToVoid - Cast to void. 1911 CK_ToVoid, 1912 1913 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1914 /// vector type with the same element type as the src type. Splats the 1915 /// src expression into the destination expression. 1916 CK_VectorSplat, 1917 1918 /// CK_IntegralCast - Casting between integral types of different size. 1919 CK_IntegralCast, 1920 1921 /// CK_IntegralToFloating - Integral to floating point. 1922 CK_IntegralToFloating, 1923 1924 /// CK_FloatingToIntegral - Floating point to integral. 1925 CK_FloatingToIntegral, 1926 1927 /// CK_FloatingCast - Casting between floating types of different size. 1928 CK_FloatingCast, 1929 1930 /// CK_MemberPointerToBoolean - Member pointer to boolean 1931 CK_MemberPointerToBoolean, 1932 1933 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1934 /// pointer 1935 CK_AnyPointerToObjCPointerCast, 1936 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1937 /// pointer 1938 CK_AnyPointerToBlockPointerCast 1939 1940 }; 1941 1942private: 1943 CastKind Kind; 1944 Stmt *Op; 1945 1946 /// BasePath - For derived-to-base and base-to-derived casts, the base array 1947 /// contains the inheritance path. 1948 CXXBaseSpecifierArray BasePath; 1949 1950 void CheckBasePath() const { 1951#ifndef NDEBUG 1952 switch (getCastKind()) { 1953 case CK_DerivedToBase: 1954 case CK_UncheckedDerivedToBase: 1955 case CK_DerivedToBaseMemberPointer: 1956 case CK_BaseToDerived: 1957 case CK_BaseToDerivedMemberPointer: 1958 assert(!BasePath.empty() && "Cast kind should have a base path!"); 1959 break; 1960 1961 // These should not have an inheritance path. 1962 case CK_Unknown: 1963 case CK_BitCast: 1964 case CK_NoOp: 1965 case CK_Dynamic: 1966 case CK_ToUnion: 1967 case CK_ArrayToPointerDecay: 1968 case CK_FunctionToPointerDecay: 1969 case CK_NullToMemberPointer: 1970 case CK_UserDefinedConversion: 1971 case CK_ConstructorConversion: 1972 case CK_IntegralToPointer: 1973 case CK_PointerToIntegral: 1974 case CK_ToVoid: 1975 case CK_VectorSplat: 1976 case CK_IntegralCast: 1977 case CK_IntegralToFloating: 1978 case CK_FloatingToIntegral: 1979 case CK_FloatingCast: 1980 case CK_MemberPointerToBoolean: 1981 case CK_AnyPointerToObjCPointerCast: 1982 case CK_AnyPointerToBlockPointerCast: 1983 assert(BasePath.empty() && "Cast kind should not have a base path!"); 1984 break; 1985 } 1986#endif 1987 } 1988 1989protected: 1990 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1991 CXXBaseSpecifierArray BasePath) : 1992 Expr(SC, ty, 1993 // Cast expressions are type-dependent if the type is 1994 // dependent (C++ [temp.dep.expr]p3). 1995 ty->isDependentType(), 1996 // Cast expressions are value-dependent if the type is 1997 // dependent or if the subexpression is value-dependent. 1998 ty->isDependentType() || (op && op->isValueDependent())), 1999 Kind(kind), Op(op), BasePath(BasePath) { 2000 CheckBasePath(); 2001 } 2002 2003 /// \brief Construct an empty cast. 2004 CastExpr(StmtClass SC, EmptyShell Empty) 2005 : Expr(SC, Empty) { } 2006 2007 virtual void DoDestroy(ASTContext &C); 2008 2009public: 2010 CastKind getCastKind() const { return Kind; } 2011 void setCastKind(CastKind K) { Kind = K; } 2012 const char *getCastKindName() const; 2013 2014 Expr *getSubExpr() { return cast<Expr>(Op); } 2015 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2016 void setSubExpr(Expr *E) { Op = E; } 2017 2018 /// \brief Retrieve the cast subexpression as it was written in the source 2019 /// code, looking through any implicit casts or other intermediate nodes 2020 /// introduced by semantic analysis. 2021 Expr *getSubExprAsWritten(); 2022 const Expr *getSubExprAsWritten() const { 2023 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2024 } 2025 2026 const CXXBaseSpecifierArray& getBasePath() const { return BasePath; } 2027 CXXBaseSpecifierArray& getBasePath() { return BasePath; } 2028 2029 static bool classof(const Stmt *T) { 2030 return T->getStmtClass() >= firstCastExprConstant && 2031 T->getStmtClass() <= lastCastExprConstant; 2032 } 2033 static bool classof(const CastExpr *) { return true; } 2034 2035 // Iterators 2036 virtual child_iterator child_begin(); 2037 virtual child_iterator child_end(); 2038}; 2039 2040/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2041/// conversions, which have no direct representation in the original 2042/// source code. For example: converting T[]->T*, void f()->void 2043/// (*f)(), float->double, short->int, etc. 2044/// 2045/// In C, implicit casts always produce rvalues. However, in C++, an 2046/// implicit cast whose result is being bound to a reference will be 2047/// an lvalue. For example: 2048/// 2049/// @code 2050/// class Base { }; 2051/// class Derived : public Base { }; 2052/// void f(Derived d) { 2053/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 2054/// } 2055/// @endcode 2056class ImplicitCastExpr : public CastExpr { 2057 /// LvalueCast - Whether this cast produces an lvalue. 2058 bool LvalueCast; 2059 2060public: 2061 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2062 CXXBaseSpecifierArray BasePath, bool Lvalue) 2063 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePath), 2064 LvalueCast(Lvalue) { } 2065 2066 /// \brief Construct an empty implicit cast. 2067 explicit ImplicitCastExpr(EmptyShell Shell) 2068 : CastExpr(ImplicitCastExprClass, Shell) { } 2069 2070 virtual SourceRange getSourceRange() const { 2071 return getSubExpr()->getSourceRange(); 2072 } 2073 2074 /// isLvalueCast - Whether this cast produces an lvalue. 2075 bool isLvalueCast() const { return LvalueCast; } 2076 2077 /// setLvalueCast - Set whether this cast produces an lvalue. 2078 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 2079 2080 static bool classof(const Stmt *T) { 2081 return T->getStmtClass() == ImplicitCastExprClass; 2082 } 2083 static bool classof(const ImplicitCastExpr *) { return true; } 2084}; 2085 2086/// ExplicitCastExpr - An explicit cast written in the source 2087/// code. 2088/// 2089/// This class is effectively an abstract class, because it provides 2090/// the basic representation of an explicitly-written cast without 2091/// specifying which kind of cast (C cast, functional cast, static 2092/// cast, etc.) was written; specific derived classes represent the 2093/// particular style of cast and its location information. 2094/// 2095/// Unlike implicit casts, explicit cast nodes have two different 2096/// types: the type that was written into the source code, and the 2097/// actual type of the expression as determined by semantic 2098/// analysis. These types may differ slightly. For example, in C++ one 2099/// can cast to a reference type, which indicates that the resulting 2100/// expression will be an lvalue. The reference type, however, will 2101/// not be used as the type of the expression. 2102class ExplicitCastExpr : public CastExpr { 2103 /// TInfo - Source type info for the (written) type 2104 /// this expression is casting to. 2105 TypeSourceInfo *TInfo; 2106 2107protected: 2108 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2109 Expr *op, CXXBaseSpecifierArray BasePath, 2110 TypeSourceInfo *writtenTy) 2111 : CastExpr(SC, exprTy, kind, op, BasePath), TInfo(writtenTy) {} 2112 2113 /// \brief Construct an empty explicit cast. 2114 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 2115 : CastExpr(SC, Shell) { } 2116 2117public: 2118 /// getTypeInfoAsWritten - Returns the type source info for the type 2119 /// that this expression is casting to. 2120 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2121 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2122 2123 /// getTypeAsWritten - Returns the type that this expression is 2124 /// casting to, as written in the source code. 2125 QualType getTypeAsWritten() const { return TInfo->getType(); } 2126 2127 static bool classof(const Stmt *T) { 2128 return T->getStmtClass() >= firstExplicitCastExprConstant && 2129 T->getStmtClass() <= lastExplicitCastExprConstant; 2130 } 2131 static bool classof(const ExplicitCastExpr *) { return true; } 2132}; 2133 2134/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2135/// cast in C++ (C++ [expr.cast]), which uses the syntax 2136/// (Type)expr. For example: @c (int)f. 2137class CStyleCastExpr : public ExplicitCastExpr { 2138 SourceLocation LPLoc; // the location of the left paren 2139 SourceLocation RPLoc; // the location of the right paren 2140public: 2141 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2142 CXXBaseSpecifierArray BasePath, TypeSourceInfo *writtenTy, 2143 SourceLocation l, SourceLocation r) 2144 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, BasePath, 2145 writtenTy), LPLoc(l), RPLoc(r) {} 2146 2147 /// \brief Construct an empty C-style explicit cast. 2148 explicit CStyleCastExpr(EmptyShell Shell) 2149 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 2150 2151 SourceLocation getLParenLoc() const { return LPLoc; } 2152 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2153 2154 SourceLocation getRParenLoc() const { return RPLoc; } 2155 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2156 2157 virtual SourceRange getSourceRange() const { 2158 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2159 } 2160 static bool classof(const Stmt *T) { 2161 return T->getStmtClass() == CStyleCastExprClass; 2162 } 2163 static bool classof(const CStyleCastExpr *) { return true; } 2164}; 2165 2166/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2167/// 2168/// This expression node kind describes a builtin binary operation, 2169/// such as "x + y" for integer values "x" and "y". The operands will 2170/// already have been converted to appropriate types (e.g., by 2171/// performing promotions or conversions). 2172/// 2173/// In C++, where operators may be overloaded, a different kind of 2174/// expression node (CXXOperatorCallExpr) is used to express the 2175/// invocation of an overloaded operator with operator syntax. Within 2176/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2177/// used to store an expression "x + y" depends on the subexpressions 2178/// for x and y. If neither x or y is type-dependent, and the "+" 2179/// operator resolves to a built-in operation, BinaryOperator will be 2180/// used to express the computation (x and y may still be 2181/// value-dependent). If either x or y is type-dependent, or if the 2182/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2183/// be used to express the computation. 2184class BinaryOperator : public Expr { 2185public: 2186 enum Opcode { 2187 // Operators listed in order of precedence. 2188 // Note that additions to this should also update the StmtVisitor class. 2189 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 2190 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 2191 Add, Sub, // [C99 6.5.6] Additive operators. 2192 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 2193 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 2194 EQ, NE, // [C99 6.5.9] Equality operators. 2195 And, // [C99 6.5.10] Bitwise AND operator. 2196 Xor, // [C99 6.5.11] Bitwise XOR operator. 2197 Or, // [C99 6.5.12] Bitwise OR operator. 2198 LAnd, // [C99 6.5.13] Logical AND operator. 2199 LOr, // [C99 6.5.14] Logical OR operator. 2200 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 2201 DivAssign, RemAssign, 2202 AddAssign, SubAssign, 2203 ShlAssign, ShrAssign, 2204 AndAssign, XorAssign, 2205 OrAssign, 2206 Comma // [C99 6.5.17] Comma operator. 2207 }; 2208private: 2209 enum { LHS, RHS, END_EXPR }; 2210 Stmt* SubExprs[END_EXPR]; 2211 Opcode Opc; 2212 SourceLocation OpLoc; 2213public: 2214 2215 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2216 SourceLocation opLoc) 2217 : Expr(BinaryOperatorClass, ResTy, 2218 lhs->isTypeDependent() || rhs->isTypeDependent(), 2219 lhs->isValueDependent() || rhs->isValueDependent()), 2220 Opc(opc), OpLoc(opLoc) { 2221 SubExprs[LHS] = lhs; 2222 SubExprs[RHS] = rhs; 2223 assert(!isCompoundAssignmentOp() && 2224 "Use ArithAssignBinaryOperator for compound assignments"); 2225 } 2226 2227 /// \brief Construct an empty binary operator. 2228 explicit BinaryOperator(EmptyShell Empty) 2229 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 2230 2231 SourceLocation getOperatorLoc() const { return OpLoc; } 2232 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2233 2234 Opcode getOpcode() const { return Opc; } 2235 void setOpcode(Opcode O) { Opc = O; } 2236 2237 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2238 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2239 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2240 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2241 2242 virtual SourceRange getSourceRange() const { 2243 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2244 } 2245 2246 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2247 /// corresponds to, e.g. "<<=". 2248 static const char *getOpcodeStr(Opcode Op); 2249 2250 /// \brief Retrieve the binary opcode that corresponds to the given 2251 /// overloaded operator. 2252 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2253 2254 /// \brief Retrieve the overloaded operator kind that corresponds to 2255 /// the given binary opcode. 2256 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2257 2258 /// predicates to categorize the respective opcodes. 2259 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 2260 static bool isAdditiveOp(Opcode Opc) { return Opc == Add || Opc == Sub; } 2261 bool isAdditiveOp() const { return isAdditiveOp(Opc); } 2262 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 2263 bool isShiftOp() const { return isShiftOp(Opc); } 2264 2265 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 2266 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 2267 2268 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 2269 bool isRelationalOp() const { return isRelationalOp(Opc); } 2270 2271 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 2272 bool isEqualityOp() const { return isEqualityOp(Opc); } 2273 2274 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 2275 bool isComparisonOp() const { return isComparisonOp(Opc); } 2276 2277 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 2278 bool isLogicalOp() const { return isLogicalOp(Opc); } 2279 2280 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 2281 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 2282 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 2283 2284 static bool classof(const Stmt *S) { 2285 return S->getStmtClass() >= firstBinaryOperatorConstant && 2286 S->getStmtClass() <= lastBinaryOperatorConstant; 2287 } 2288 static bool classof(const BinaryOperator *) { return true; } 2289 2290 // Iterators 2291 virtual child_iterator child_begin(); 2292 virtual child_iterator child_end(); 2293 2294protected: 2295 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2296 SourceLocation opLoc, bool dead) 2297 : Expr(CompoundAssignOperatorClass, ResTy, 2298 lhs->isTypeDependent() || rhs->isTypeDependent(), 2299 lhs->isValueDependent() || rhs->isValueDependent()), 2300 Opc(opc), OpLoc(opLoc) { 2301 SubExprs[LHS] = lhs; 2302 SubExprs[RHS] = rhs; 2303 } 2304 2305 BinaryOperator(StmtClass SC, EmptyShell Empty) 2306 : Expr(SC, Empty), Opc(MulAssign) { } 2307}; 2308 2309/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2310/// track of the type the operation is performed in. Due to the semantics of 2311/// these operators, the operands are promoted, the aritmetic performed, an 2312/// implicit conversion back to the result type done, then the assignment takes 2313/// place. This captures the intermediate type which the computation is done 2314/// in. 2315class CompoundAssignOperator : public BinaryOperator { 2316 QualType ComputationLHSType; 2317 QualType ComputationResultType; 2318public: 2319 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2320 QualType ResType, QualType CompLHSType, 2321 QualType CompResultType, 2322 SourceLocation OpLoc) 2323 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2324 ComputationLHSType(CompLHSType), 2325 ComputationResultType(CompResultType) { 2326 assert(isCompoundAssignmentOp() && 2327 "Only should be used for compound assignments"); 2328 } 2329 2330 /// \brief Build an empty compound assignment operator expression. 2331 explicit CompoundAssignOperator(EmptyShell Empty) 2332 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2333 2334 // The two computation types are the type the LHS is converted 2335 // to for the computation and the type of the result; the two are 2336 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2337 QualType getComputationLHSType() const { return ComputationLHSType; } 2338 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2339 2340 QualType getComputationResultType() const { return ComputationResultType; } 2341 void setComputationResultType(QualType T) { ComputationResultType = T; } 2342 2343 static bool classof(const CompoundAssignOperator *) { return true; } 2344 static bool classof(const Stmt *S) { 2345 return S->getStmtClass() == CompoundAssignOperatorClass; 2346 } 2347}; 2348 2349/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2350/// GNU "missing LHS" extension is in use. 2351/// 2352class ConditionalOperator : public Expr { 2353 enum { COND, LHS, RHS, END_EXPR }; 2354 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2355 SourceLocation QuestionLoc, ColonLoc; 2356public: 2357 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2358 SourceLocation CLoc, Expr *rhs, QualType t) 2359 : Expr(ConditionalOperatorClass, t, 2360 // FIXME: the type of the conditional operator doesn't 2361 // depend on the type of the conditional, but the standard 2362 // seems to imply that it could. File a bug! 2363 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2364 (cond->isValueDependent() || 2365 (lhs && lhs->isValueDependent()) || 2366 (rhs && rhs->isValueDependent()))), 2367 QuestionLoc(QLoc), 2368 ColonLoc(CLoc) { 2369 SubExprs[COND] = cond; 2370 SubExprs[LHS] = lhs; 2371 SubExprs[RHS] = rhs; 2372 } 2373 2374 /// \brief Build an empty conditional operator. 2375 explicit ConditionalOperator(EmptyShell Empty) 2376 : Expr(ConditionalOperatorClass, Empty) { } 2377 2378 // getCond - Return the expression representing the condition for 2379 // the ?: operator. 2380 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2381 void setCond(Expr *E) { SubExprs[COND] = E; } 2382 2383 // getTrueExpr - Return the subexpression representing the value of the ?: 2384 // expression if the condition evaluates to true. In most cases this value 2385 // will be the same as getLHS() except a GCC extension allows the left 2386 // subexpression to be omitted, and instead of the condition be returned. 2387 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2388 // is only evaluated once. 2389 Expr *getTrueExpr() const { 2390 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2391 } 2392 2393 // getTrueExpr - Return the subexpression representing the value of the ?: 2394 // expression if the condition evaluates to false. This is the same as getRHS. 2395 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2396 2397 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2398 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2399 2400 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2401 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2402 2403 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2404 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2405 2406 SourceLocation getColonLoc() const { return ColonLoc; } 2407 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2408 2409 virtual SourceRange getSourceRange() const { 2410 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2411 } 2412 static bool classof(const Stmt *T) { 2413 return T->getStmtClass() == ConditionalOperatorClass; 2414 } 2415 static bool classof(const ConditionalOperator *) { return true; } 2416 2417 // Iterators 2418 virtual child_iterator child_begin(); 2419 virtual child_iterator child_end(); 2420}; 2421 2422/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2423class AddrLabelExpr : public Expr { 2424 SourceLocation AmpAmpLoc, LabelLoc; 2425 LabelStmt *Label; 2426public: 2427 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2428 QualType t) 2429 : Expr(AddrLabelExprClass, t, false, false), 2430 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2431 2432 /// \brief Build an empty address of a label expression. 2433 explicit AddrLabelExpr(EmptyShell Empty) 2434 : Expr(AddrLabelExprClass, Empty) { } 2435 2436 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2437 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2438 SourceLocation getLabelLoc() const { return LabelLoc; } 2439 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2440 2441 virtual SourceRange getSourceRange() const { 2442 return SourceRange(AmpAmpLoc, LabelLoc); 2443 } 2444 2445 LabelStmt *getLabel() const { return Label; } 2446 void setLabel(LabelStmt *S) { Label = S; } 2447 2448 static bool classof(const Stmt *T) { 2449 return T->getStmtClass() == AddrLabelExprClass; 2450 } 2451 static bool classof(const AddrLabelExpr *) { return true; } 2452 2453 // Iterators 2454 virtual child_iterator child_begin(); 2455 virtual child_iterator child_end(); 2456}; 2457 2458/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2459/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2460/// takes the value of the last subexpression. 2461class StmtExpr : public Expr { 2462 Stmt *SubStmt; 2463 SourceLocation LParenLoc, RParenLoc; 2464public: 2465 // FIXME: Does type-dependence need to be computed differently? 2466 StmtExpr(CompoundStmt *substmt, QualType T, 2467 SourceLocation lp, SourceLocation rp) : 2468 Expr(StmtExprClass, T, T->isDependentType(), false), 2469 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2470 2471 /// \brief Build an empty statement expression. 2472 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2473 2474 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2475 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2476 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2477 2478 virtual SourceRange getSourceRange() const { 2479 return SourceRange(LParenLoc, RParenLoc); 2480 } 2481 2482 SourceLocation getLParenLoc() const { return LParenLoc; } 2483 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2484 SourceLocation getRParenLoc() const { return RParenLoc; } 2485 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2486 2487 static bool classof(const Stmt *T) { 2488 return T->getStmtClass() == StmtExprClass; 2489 } 2490 static bool classof(const StmtExpr *) { return true; } 2491 2492 // Iterators 2493 virtual child_iterator child_begin(); 2494 virtual child_iterator child_end(); 2495}; 2496 2497/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2498/// This AST node represents a function that returns 1 if two *types* (not 2499/// expressions) are compatible. The result of this built-in function can be 2500/// used in integer constant expressions. 2501class TypesCompatibleExpr : public Expr { 2502 QualType Type1; 2503 QualType Type2; 2504 SourceLocation BuiltinLoc, RParenLoc; 2505public: 2506 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2507 QualType t1, QualType t2, SourceLocation RP) : 2508 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2509 Type1(t1), Type2(t2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2510 2511 /// \brief Build an empty __builtin_type_compatible_p expression. 2512 explicit TypesCompatibleExpr(EmptyShell Empty) 2513 : Expr(TypesCompatibleExprClass, Empty) { } 2514 2515 QualType getArgType1() const { return Type1; } 2516 void setArgType1(QualType T) { Type1 = T; } 2517 QualType getArgType2() const { return Type2; } 2518 void setArgType2(QualType T) { Type2 = T; } 2519 2520 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2521 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2522 2523 SourceLocation getRParenLoc() const { return RParenLoc; } 2524 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2525 2526 virtual SourceRange getSourceRange() const { 2527 return SourceRange(BuiltinLoc, RParenLoc); 2528 } 2529 static bool classof(const Stmt *T) { 2530 return T->getStmtClass() == TypesCompatibleExprClass; 2531 } 2532 static bool classof(const TypesCompatibleExpr *) { return true; } 2533 2534 // Iterators 2535 virtual child_iterator child_begin(); 2536 virtual child_iterator child_end(); 2537}; 2538 2539/// ShuffleVectorExpr - clang-specific builtin-in function 2540/// __builtin_shufflevector. 2541/// This AST node represents a operator that does a constant 2542/// shuffle, similar to LLVM's shufflevector instruction. It takes 2543/// two vectors and a variable number of constant indices, 2544/// and returns the appropriately shuffled vector. 2545class ShuffleVectorExpr : public Expr { 2546 SourceLocation BuiltinLoc, RParenLoc; 2547 2548 // SubExprs - the list of values passed to the __builtin_shufflevector 2549 // function. The first two are vectors, and the rest are constant 2550 // indices. The number of values in this list is always 2551 // 2+the number of indices in the vector type. 2552 Stmt **SubExprs; 2553 unsigned NumExprs; 2554 2555protected: 2556 virtual void DoDestroy(ASTContext &C); 2557 2558public: 2559 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2560 // to be computed differently? 2561 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2562 QualType Type, SourceLocation BLoc, 2563 SourceLocation RP) : 2564 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2565 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2566 2567 SubExprs = new (C) Stmt*[nexpr]; 2568 for (unsigned i = 0; i < nexpr; i++) 2569 SubExprs[i] = args[i]; 2570 } 2571 2572 /// \brief Build an empty vector-shuffle expression. 2573 explicit ShuffleVectorExpr(EmptyShell Empty) 2574 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2575 2576 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2577 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2578 2579 SourceLocation getRParenLoc() const { return RParenLoc; } 2580 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2581 2582 virtual SourceRange getSourceRange() const { 2583 return SourceRange(BuiltinLoc, RParenLoc); 2584 } 2585 static bool classof(const Stmt *T) { 2586 return T->getStmtClass() == ShuffleVectorExprClass; 2587 } 2588 static bool classof(const ShuffleVectorExpr *) { return true; } 2589 2590 ~ShuffleVectorExpr() {} 2591 2592 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2593 /// constant expression, the actual arguments passed in, and the function 2594 /// pointers. 2595 unsigned getNumSubExprs() const { return NumExprs; } 2596 2597 /// getExpr - Return the Expr at the specified index. 2598 Expr *getExpr(unsigned Index) { 2599 assert((Index < NumExprs) && "Arg access out of range!"); 2600 return cast<Expr>(SubExprs[Index]); 2601 } 2602 const Expr *getExpr(unsigned Index) const { 2603 assert((Index < NumExprs) && "Arg access out of range!"); 2604 return cast<Expr>(SubExprs[Index]); 2605 } 2606 2607 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2608 2609 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2610 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2611 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2612 } 2613 2614 // Iterators 2615 virtual child_iterator child_begin(); 2616 virtual child_iterator child_end(); 2617}; 2618 2619/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2620/// This AST node is similar to the conditional operator (?:) in C, with 2621/// the following exceptions: 2622/// - the test expression must be a integer constant expression. 2623/// - the expression returned acts like the chosen subexpression in every 2624/// visible way: the type is the same as that of the chosen subexpression, 2625/// and all predicates (whether it's an l-value, whether it's an integer 2626/// constant expression, etc.) return the same result as for the chosen 2627/// sub-expression. 2628class ChooseExpr : public Expr { 2629 enum { COND, LHS, RHS, END_EXPR }; 2630 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2631 SourceLocation BuiltinLoc, RParenLoc; 2632public: 2633 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2634 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2635 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2636 BuiltinLoc(BLoc), RParenLoc(RP) { 2637 SubExprs[COND] = cond; 2638 SubExprs[LHS] = lhs; 2639 SubExprs[RHS] = rhs; 2640 } 2641 2642 /// \brief Build an empty __builtin_choose_expr. 2643 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2644 2645 /// isConditionTrue - Return whether the condition is true (i.e. not 2646 /// equal to zero). 2647 bool isConditionTrue(ASTContext &C) const; 2648 2649 /// getChosenSubExpr - Return the subexpression chosen according to the 2650 /// condition. 2651 Expr *getChosenSubExpr(ASTContext &C) const { 2652 return isConditionTrue(C) ? getLHS() : getRHS(); 2653 } 2654 2655 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2656 void setCond(Expr *E) { SubExprs[COND] = E; } 2657 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2658 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2659 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2660 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2661 2662 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2663 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2664 2665 SourceLocation getRParenLoc() const { return RParenLoc; } 2666 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2667 2668 virtual SourceRange getSourceRange() const { 2669 return SourceRange(BuiltinLoc, RParenLoc); 2670 } 2671 static bool classof(const Stmt *T) { 2672 return T->getStmtClass() == ChooseExprClass; 2673 } 2674 static bool classof(const ChooseExpr *) { return true; } 2675 2676 // Iterators 2677 virtual child_iterator child_begin(); 2678 virtual child_iterator child_end(); 2679}; 2680 2681/// GNUNullExpr - Implements the GNU __null extension, which is a name 2682/// for a null pointer constant that has integral type (e.g., int or 2683/// long) and is the same size and alignment as a pointer. The __null 2684/// extension is typically only used by system headers, which define 2685/// NULL as __null in C++ rather than using 0 (which is an integer 2686/// that may not match the size of a pointer). 2687class GNUNullExpr : public Expr { 2688 /// TokenLoc - The location of the __null keyword. 2689 SourceLocation TokenLoc; 2690 2691public: 2692 GNUNullExpr(QualType Ty, SourceLocation Loc) 2693 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2694 2695 /// \brief Build an empty GNU __null expression. 2696 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2697 2698 /// getTokenLocation - The location of the __null token. 2699 SourceLocation getTokenLocation() const { return TokenLoc; } 2700 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2701 2702 virtual SourceRange getSourceRange() const { 2703 return SourceRange(TokenLoc); 2704 } 2705 static bool classof(const Stmt *T) { 2706 return T->getStmtClass() == GNUNullExprClass; 2707 } 2708 static bool classof(const GNUNullExpr *) { return true; } 2709 2710 // Iterators 2711 virtual child_iterator child_begin(); 2712 virtual child_iterator child_end(); 2713}; 2714 2715/// VAArgExpr, used for the builtin function __builtin_va_arg. 2716class VAArgExpr : public Expr { 2717 Stmt *Val; 2718 SourceLocation BuiltinLoc, RParenLoc; 2719public: 2720 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2721 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2722 Val(e), 2723 BuiltinLoc(BLoc), 2724 RParenLoc(RPLoc) { } 2725 2726 /// \brief Create an empty __builtin_va_arg expression. 2727 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2728 2729 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2730 Expr *getSubExpr() { return cast<Expr>(Val); } 2731 void setSubExpr(Expr *E) { Val = E; } 2732 2733 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2734 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2735 2736 SourceLocation getRParenLoc() const { return RParenLoc; } 2737 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2738 2739 virtual SourceRange getSourceRange() const { 2740 return SourceRange(BuiltinLoc, RParenLoc); 2741 } 2742 static bool classof(const Stmt *T) { 2743 return T->getStmtClass() == VAArgExprClass; 2744 } 2745 static bool classof(const VAArgExpr *) { return true; } 2746 2747 // Iterators 2748 virtual child_iterator child_begin(); 2749 virtual child_iterator child_end(); 2750}; 2751 2752/// @brief Describes an C or C++ initializer list. 2753/// 2754/// InitListExpr describes an initializer list, which can be used to 2755/// initialize objects of different types, including 2756/// struct/class/union types, arrays, and vectors. For example: 2757/// 2758/// @code 2759/// struct foo x = { 1, { 2, 3 } }; 2760/// @endcode 2761/// 2762/// Prior to semantic analysis, an initializer list will represent the 2763/// initializer list as written by the user, but will have the 2764/// placeholder type "void". This initializer list is called the 2765/// syntactic form of the initializer, and may contain C99 designated 2766/// initializers (represented as DesignatedInitExprs), initializations 2767/// of subobject members without explicit braces, and so on. Clients 2768/// interested in the original syntax of the initializer list should 2769/// use the syntactic form of the initializer list. 2770/// 2771/// After semantic analysis, the initializer list will represent the 2772/// semantic form of the initializer, where the initializations of all 2773/// subobjects are made explicit with nested InitListExpr nodes and 2774/// C99 designators have been eliminated by placing the designated 2775/// initializations into the subobject they initialize. Additionally, 2776/// any "holes" in the initialization, where no initializer has been 2777/// specified for a particular subobject, will be replaced with 2778/// implicitly-generated ImplicitValueInitExpr expressions that 2779/// value-initialize the subobjects. Note, however, that the 2780/// initializer lists may still have fewer initializers than there are 2781/// elements to initialize within the object. 2782/// 2783/// Given the semantic form of the initializer list, one can retrieve 2784/// the original syntactic form of that initializer list (if it 2785/// exists) using getSyntacticForm(). Since many initializer lists 2786/// have the same syntactic and semantic forms, getSyntacticForm() may 2787/// return NULL, indicating that the current initializer list also 2788/// serves as its syntactic form. 2789class InitListExpr : public Expr { 2790 // FIXME: Eliminate this vector in favor of ASTContext allocation 2791 typedef ASTVector<Stmt *> InitExprsTy; 2792 InitExprsTy InitExprs; 2793 SourceLocation LBraceLoc, RBraceLoc; 2794 2795 /// Contains the initializer list that describes the syntactic form 2796 /// written in the source code. 2797 InitListExpr *SyntacticForm; 2798 2799 /// If this initializer list initializes a union, specifies which 2800 /// field within the union will be initialized. 2801 FieldDecl *UnionFieldInit; 2802 2803 /// Whether this initializer list originally had a GNU array-range 2804 /// designator in it. This is a temporary marker used by CodeGen. 2805 bool HadArrayRangeDesignator; 2806 2807public: 2808 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2809 Expr **initexprs, unsigned numinits, 2810 SourceLocation rbraceloc); 2811 2812 /// \brief Build an empty initializer list. 2813 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2814 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2815 2816 unsigned getNumInits() const { return InitExprs.size(); } 2817 2818 const Expr* getInit(unsigned Init) const { 2819 assert(Init < getNumInits() && "Initializer access out of range!"); 2820 return cast_or_null<Expr>(InitExprs[Init]); 2821 } 2822 2823 Expr* getInit(unsigned Init) { 2824 assert(Init < getNumInits() && "Initializer access out of range!"); 2825 return cast_or_null<Expr>(InitExprs[Init]); 2826 } 2827 2828 void setInit(unsigned Init, Expr *expr) { 2829 assert(Init < getNumInits() && "Initializer access out of range!"); 2830 InitExprs[Init] = expr; 2831 } 2832 2833 /// \brief Reserve space for some number of initializers. 2834 void reserveInits(ASTContext &C, unsigned NumInits); 2835 2836 /// @brief Specify the number of initializers 2837 /// 2838 /// If there are more than @p NumInits initializers, the remaining 2839 /// initializers will be destroyed. If there are fewer than @p 2840 /// NumInits initializers, NULL expressions will be added for the 2841 /// unknown initializers. 2842 void resizeInits(ASTContext &Context, unsigned NumInits); 2843 2844 /// @brief Updates the initializer at index @p Init with the new 2845 /// expression @p expr, and returns the old expression at that 2846 /// location. 2847 /// 2848 /// When @p Init is out of range for this initializer list, the 2849 /// initializer list will be extended with NULL expressions to 2850 /// accomodate the new entry. 2851 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2852 2853 /// \brief If this initializes a union, specifies which field in the 2854 /// union to initialize. 2855 /// 2856 /// Typically, this field is the first named field within the 2857 /// union. However, a designated initializer can specify the 2858 /// initialization of a different field within the union. 2859 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2860 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2861 2862 // Explicit InitListExpr's originate from source code (and have valid source 2863 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2864 bool isExplicit() { 2865 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2866 } 2867 2868 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2869 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2870 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2871 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2872 2873 /// @brief Retrieve the initializer list that describes the 2874 /// syntactic form of the initializer. 2875 /// 2876 /// 2877 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2878 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2879 2880 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2881 void sawArrayRangeDesignator(bool ARD = true) { 2882 HadArrayRangeDesignator = ARD; 2883 } 2884 2885 virtual SourceRange getSourceRange() const { 2886 return SourceRange(LBraceLoc, RBraceLoc); 2887 } 2888 static bool classof(const Stmt *T) { 2889 return T->getStmtClass() == InitListExprClass; 2890 } 2891 static bool classof(const InitListExpr *) { return true; } 2892 2893 // Iterators 2894 virtual child_iterator child_begin(); 2895 virtual child_iterator child_end(); 2896 2897 typedef InitExprsTy::iterator iterator; 2898 typedef InitExprsTy::reverse_iterator reverse_iterator; 2899 2900 iterator begin() { return InitExprs.begin(); } 2901 iterator end() { return InitExprs.end(); } 2902 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2903 reverse_iterator rend() { return InitExprs.rend(); } 2904}; 2905 2906/// @brief Represents a C99 designated initializer expression. 2907/// 2908/// A designated initializer expression (C99 6.7.8) contains one or 2909/// more designators (which can be field designators, array 2910/// designators, or GNU array-range designators) followed by an 2911/// expression that initializes the field or element(s) that the 2912/// designators refer to. For example, given: 2913/// 2914/// @code 2915/// struct point { 2916/// double x; 2917/// double y; 2918/// }; 2919/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2920/// @endcode 2921/// 2922/// The InitListExpr contains three DesignatedInitExprs, the first of 2923/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2924/// designators, one array designator for @c [2] followed by one field 2925/// designator for @c .y. The initalization expression will be 1.0. 2926class DesignatedInitExpr : public Expr { 2927public: 2928 /// \brief Forward declaration of the Designator class. 2929 class Designator; 2930 2931private: 2932 /// The location of the '=' or ':' prior to the actual initializer 2933 /// expression. 2934 SourceLocation EqualOrColonLoc; 2935 2936 /// Whether this designated initializer used the GNU deprecated 2937 /// syntax rather than the C99 '=' syntax. 2938 bool GNUSyntax : 1; 2939 2940 /// The number of designators in this initializer expression. 2941 unsigned NumDesignators : 15; 2942 2943 /// \brief The designators in this designated initialization 2944 /// expression. 2945 Designator *Designators; 2946 2947 /// The number of subexpressions of this initializer expression, 2948 /// which contains both the initializer and any additional 2949 /// expressions used by array and array-range designators. 2950 unsigned NumSubExprs : 16; 2951 2952 2953 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2954 const Designator *Designators, 2955 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2956 Expr **IndexExprs, unsigned NumIndexExprs, 2957 Expr *Init); 2958 2959 explicit DesignatedInitExpr(unsigned NumSubExprs) 2960 : Expr(DesignatedInitExprClass, EmptyShell()), 2961 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2962 2963protected: 2964 virtual void DoDestroy(ASTContext &C); 2965 2966 void DestroyDesignators(ASTContext &C); 2967 2968public: 2969 /// A field designator, e.g., ".x". 2970 struct FieldDesignator { 2971 /// Refers to the field that is being initialized. The low bit 2972 /// of this field determines whether this is actually a pointer 2973 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2974 /// initially constructed, a field designator will store an 2975 /// IdentifierInfo*. After semantic analysis has resolved that 2976 /// name, the field designator will instead store a FieldDecl*. 2977 uintptr_t NameOrField; 2978 2979 /// The location of the '.' in the designated initializer. 2980 unsigned DotLoc; 2981 2982 /// The location of the field name in the designated initializer. 2983 unsigned FieldLoc; 2984 }; 2985 2986 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2987 struct ArrayOrRangeDesignator { 2988 /// Location of the first index expression within the designated 2989 /// initializer expression's list of subexpressions. 2990 unsigned Index; 2991 /// The location of the '[' starting the array range designator. 2992 unsigned LBracketLoc; 2993 /// The location of the ellipsis separating the start and end 2994 /// indices. Only valid for GNU array-range designators. 2995 unsigned EllipsisLoc; 2996 /// The location of the ']' terminating the array range designator. 2997 unsigned RBracketLoc; 2998 }; 2999 3000 /// @brief Represents a single C99 designator. 3001 /// 3002 /// @todo This class is infuriatingly similar to clang::Designator, 3003 /// but minor differences (storing indices vs. storing pointers) 3004 /// keep us from reusing it. Try harder, later, to rectify these 3005 /// differences. 3006 class Designator { 3007 /// @brief The kind of designator this describes. 3008 enum { 3009 FieldDesignator, 3010 ArrayDesignator, 3011 ArrayRangeDesignator 3012 } Kind; 3013 3014 union { 3015 /// A field designator, e.g., ".x". 3016 struct FieldDesignator Field; 3017 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3018 struct ArrayOrRangeDesignator ArrayOrRange; 3019 }; 3020 friend class DesignatedInitExpr; 3021 3022 public: 3023 Designator() {} 3024 3025 /// @brief Initializes a field designator. 3026 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3027 SourceLocation FieldLoc) 3028 : Kind(FieldDesignator) { 3029 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3030 Field.DotLoc = DotLoc.getRawEncoding(); 3031 Field.FieldLoc = FieldLoc.getRawEncoding(); 3032 } 3033 3034 /// @brief Initializes an array designator. 3035 Designator(unsigned Index, SourceLocation LBracketLoc, 3036 SourceLocation RBracketLoc) 3037 : Kind(ArrayDesignator) { 3038 ArrayOrRange.Index = Index; 3039 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3040 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3041 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3042 } 3043 3044 /// @brief Initializes a GNU array-range designator. 3045 Designator(unsigned Index, SourceLocation LBracketLoc, 3046 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3047 : Kind(ArrayRangeDesignator) { 3048 ArrayOrRange.Index = Index; 3049 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3050 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3051 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3052 } 3053 3054 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3055 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3056 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3057 3058 IdentifierInfo * getFieldName(); 3059 3060 FieldDecl *getField() { 3061 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3062 if (Field.NameOrField & 0x01) 3063 return 0; 3064 else 3065 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3066 } 3067 3068 void setField(FieldDecl *FD) { 3069 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3070 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3071 } 3072 3073 SourceLocation getDotLoc() const { 3074 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3075 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3076 } 3077 3078 SourceLocation getFieldLoc() const { 3079 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3080 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3081 } 3082 3083 SourceLocation getLBracketLoc() const { 3084 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3085 "Only valid on an array or array-range designator"); 3086 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3087 } 3088 3089 SourceLocation getRBracketLoc() const { 3090 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3091 "Only valid on an array or array-range designator"); 3092 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3093 } 3094 3095 SourceLocation getEllipsisLoc() const { 3096 assert(Kind == ArrayRangeDesignator && 3097 "Only valid on an array-range designator"); 3098 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3099 } 3100 3101 unsigned getFirstExprIndex() const { 3102 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3103 "Only valid on an array or array-range designator"); 3104 return ArrayOrRange.Index; 3105 } 3106 3107 SourceLocation getStartLocation() const { 3108 if (Kind == FieldDesignator) 3109 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3110 else 3111 return getLBracketLoc(); 3112 } 3113 }; 3114 3115 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3116 unsigned NumDesignators, 3117 Expr **IndexExprs, unsigned NumIndexExprs, 3118 SourceLocation EqualOrColonLoc, 3119 bool GNUSyntax, Expr *Init); 3120 3121 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3122 3123 /// @brief Returns the number of designators in this initializer. 3124 unsigned size() const { return NumDesignators; } 3125 3126 // Iterator access to the designators. 3127 typedef Designator* designators_iterator; 3128 designators_iterator designators_begin() { return Designators; } 3129 designators_iterator designators_end() { 3130 return Designators + NumDesignators; 3131 } 3132 3133 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3134 3135 void setDesignators(ASTContext &C, const Designator *Desigs, 3136 unsigned NumDesigs); 3137 3138 Expr *getArrayIndex(const Designator& D); 3139 Expr *getArrayRangeStart(const Designator& D); 3140 Expr *getArrayRangeEnd(const Designator& D); 3141 3142 /// @brief Retrieve the location of the '=' that precedes the 3143 /// initializer value itself, if present. 3144 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3145 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3146 3147 /// @brief Determines whether this designated initializer used the 3148 /// deprecated GNU syntax for designated initializers. 3149 bool usesGNUSyntax() const { return GNUSyntax; } 3150 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3151 3152 /// @brief Retrieve the initializer value. 3153 Expr *getInit() const { 3154 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3155 } 3156 3157 void setInit(Expr *init) { 3158 *child_begin() = init; 3159 } 3160 3161 /// \brief Retrieve the total number of subexpressions in this 3162 /// designated initializer expression, including the actual 3163 /// initialized value and any expressions that occur within array 3164 /// and array-range designators. 3165 unsigned getNumSubExprs() const { return NumSubExprs; } 3166 3167 Expr *getSubExpr(unsigned Idx) { 3168 assert(Idx < NumSubExprs && "Subscript out of range"); 3169 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3170 Ptr += sizeof(DesignatedInitExpr); 3171 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3172 } 3173 3174 void setSubExpr(unsigned Idx, Expr *E) { 3175 assert(Idx < NumSubExprs && "Subscript out of range"); 3176 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3177 Ptr += sizeof(DesignatedInitExpr); 3178 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3179 } 3180 3181 /// \brief Replaces the designator at index @p Idx with the series 3182 /// of designators in [First, Last). 3183 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3184 const Designator *Last); 3185 3186 virtual SourceRange getSourceRange() const; 3187 3188 static bool classof(const Stmt *T) { 3189 return T->getStmtClass() == DesignatedInitExprClass; 3190 } 3191 static bool classof(const DesignatedInitExpr *) { return true; } 3192 3193 // Iterators 3194 virtual child_iterator child_begin(); 3195 virtual child_iterator child_end(); 3196}; 3197 3198/// \brief Represents an implicitly-generated value initialization of 3199/// an object of a given type. 3200/// 3201/// Implicit value initializations occur within semantic initializer 3202/// list expressions (InitListExpr) as placeholders for subobject 3203/// initializations not explicitly specified by the user. 3204/// 3205/// \see InitListExpr 3206class ImplicitValueInitExpr : public Expr { 3207public: 3208 explicit ImplicitValueInitExpr(QualType ty) 3209 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3210 3211 /// \brief Construct an empty implicit value initialization. 3212 explicit ImplicitValueInitExpr(EmptyShell Empty) 3213 : Expr(ImplicitValueInitExprClass, Empty) { } 3214 3215 static bool classof(const Stmt *T) { 3216 return T->getStmtClass() == ImplicitValueInitExprClass; 3217 } 3218 static bool classof(const ImplicitValueInitExpr *) { return true; } 3219 3220 virtual SourceRange getSourceRange() const { 3221 return SourceRange(); 3222 } 3223 3224 // Iterators 3225 virtual child_iterator child_begin(); 3226 virtual child_iterator child_end(); 3227}; 3228 3229 3230class ParenListExpr : public Expr { 3231 Stmt **Exprs; 3232 unsigned NumExprs; 3233 SourceLocation LParenLoc, RParenLoc; 3234 3235protected: 3236 virtual void DoDestroy(ASTContext& C); 3237 3238public: 3239 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3240 unsigned numexprs, SourceLocation rparenloc); 3241 3242 ~ParenListExpr() {} 3243 3244 /// \brief Build an empty paren list. 3245 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3246 3247 unsigned getNumExprs() const { return NumExprs; } 3248 3249 const Expr* getExpr(unsigned Init) const { 3250 assert(Init < getNumExprs() && "Initializer access out of range!"); 3251 return cast_or_null<Expr>(Exprs[Init]); 3252 } 3253 3254 Expr* getExpr(unsigned Init) { 3255 assert(Init < getNumExprs() && "Initializer access out of range!"); 3256 return cast_or_null<Expr>(Exprs[Init]); 3257 } 3258 3259 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3260 3261 SourceLocation getLParenLoc() const { return LParenLoc; } 3262 SourceLocation getRParenLoc() const { return RParenLoc; } 3263 3264 virtual SourceRange getSourceRange() const { 3265 return SourceRange(LParenLoc, RParenLoc); 3266 } 3267 static bool classof(const Stmt *T) { 3268 return T->getStmtClass() == ParenListExprClass; 3269 } 3270 static bool classof(const ParenListExpr *) { return true; } 3271 3272 // Iterators 3273 virtual child_iterator child_begin(); 3274 virtual child_iterator child_end(); 3275 3276 friend class PCHStmtReader; 3277 friend class PCHStmtWriter; 3278}; 3279 3280 3281//===----------------------------------------------------------------------===// 3282// Clang Extensions 3283//===----------------------------------------------------------------------===// 3284 3285 3286/// ExtVectorElementExpr - This represents access to specific elements of a 3287/// vector, and may occur on the left hand side or right hand side. For example 3288/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3289/// 3290/// Note that the base may have either vector or pointer to vector type, just 3291/// like a struct field reference. 3292/// 3293class ExtVectorElementExpr : public Expr { 3294 Stmt *Base; 3295 IdentifierInfo *Accessor; 3296 SourceLocation AccessorLoc; 3297public: 3298 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3299 SourceLocation loc) 3300 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3301 base->isValueDependent()), 3302 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3303 3304 /// \brief Build an empty vector element expression. 3305 explicit ExtVectorElementExpr(EmptyShell Empty) 3306 : Expr(ExtVectorElementExprClass, Empty) { } 3307 3308 const Expr *getBase() const { return cast<Expr>(Base); } 3309 Expr *getBase() { return cast<Expr>(Base); } 3310 void setBase(Expr *E) { Base = E; } 3311 3312 IdentifierInfo &getAccessor() const { return *Accessor; } 3313 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3314 3315 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3316 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3317 3318 /// getNumElements - Get the number of components being selected. 3319 unsigned getNumElements() const; 3320 3321 /// containsDuplicateElements - Return true if any element access is 3322 /// repeated. 3323 bool containsDuplicateElements() const; 3324 3325 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3326 /// aggregate Constant of ConstantInt(s). 3327 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3328 3329 virtual SourceRange getSourceRange() const { 3330 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3331 } 3332 3333 /// isArrow - Return true if the base expression is a pointer to vector, 3334 /// return false if the base expression is a vector. 3335 bool isArrow() const; 3336 3337 static bool classof(const Stmt *T) { 3338 return T->getStmtClass() == ExtVectorElementExprClass; 3339 } 3340 static bool classof(const ExtVectorElementExpr *) { return true; } 3341 3342 // Iterators 3343 virtual child_iterator child_begin(); 3344 virtual child_iterator child_end(); 3345}; 3346 3347 3348/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3349/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3350class BlockExpr : public Expr { 3351protected: 3352 BlockDecl *TheBlock; 3353 bool HasBlockDeclRefExprs; 3354public: 3355 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3356 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3357 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3358 3359 /// \brief Build an empty block expression. 3360 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3361 3362 const BlockDecl *getBlockDecl() const { return TheBlock; } 3363 BlockDecl *getBlockDecl() { return TheBlock; } 3364 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3365 3366 // Convenience functions for probing the underlying BlockDecl. 3367 SourceLocation getCaretLocation() const; 3368 const Stmt *getBody() const; 3369 Stmt *getBody(); 3370 3371 virtual SourceRange getSourceRange() const { 3372 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3373 } 3374 3375 /// getFunctionType - Return the underlying function type for this block. 3376 const FunctionType *getFunctionType() const; 3377 3378 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3379 /// inside of the block that reference values outside the block. 3380 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3381 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3382 3383 static bool classof(const Stmt *T) { 3384 return T->getStmtClass() == BlockExprClass; 3385 } 3386 static bool classof(const BlockExpr *) { return true; } 3387 3388 // Iterators 3389 virtual child_iterator child_begin(); 3390 virtual child_iterator child_end(); 3391}; 3392 3393/// BlockDeclRefExpr - A reference to a declared variable, function, 3394/// enum, etc. 3395class BlockDeclRefExpr : public Expr { 3396 ValueDecl *D; 3397 SourceLocation Loc; 3398 bool IsByRef : 1; 3399 bool ConstQualAdded : 1; 3400 Stmt *CopyConstructorVal; 3401public: 3402 // FIXME: Fix type/value dependence! 3403 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3404 bool constAdded = false, 3405 Stmt *copyConstructorVal = 0) 3406 : Expr(BlockDeclRefExprClass, t, false, false), D(d), Loc(l), IsByRef(ByRef), 3407 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3408 3409 // \brief Build an empty reference to a declared variable in a 3410 // block. 3411 explicit BlockDeclRefExpr(EmptyShell Empty) 3412 : Expr(BlockDeclRefExprClass, Empty) { } 3413 3414 ValueDecl *getDecl() { return D; } 3415 const ValueDecl *getDecl() const { return D; } 3416 void setDecl(ValueDecl *VD) { D = VD; } 3417 3418 SourceLocation getLocation() const { return Loc; } 3419 void setLocation(SourceLocation L) { Loc = L; } 3420 3421 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3422 3423 bool isByRef() const { return IsByRef; } 3424 void setByRef(bool BR) { IsByRef = BR; } 3425 3426 bool isConstQualAdded() const { return ConstQualAdded; } 3427 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3428 3429 const Expr *getCopyConstructorExpr() const 3430 { return cast_or_null<Expr>(CopyConstructorVal); } 3431 Expr *getCopyConstructorExpr() 3432 { return cast_or_null<Expr>(CopyConstructorVal); } 3433 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3434 3435 static bool classof(const Stmt *T) { 3436 return T->getStmtClass() == BlockDeclRefExprClass; 3437 } 3438 static bool classof(const BlockDeclRefExpr *) { return true; } 3439 3440 // Iterators 3441 virtual child_iterator child_begin(); 3442 virtual child_iterator child_end(); 3443}; 3444 3445} // end namespace clang 3446 3447#endif 3448