Expr.h revision 9705752be3a52d72e9ad1c7c8d8e59082e40a4f1
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); 564 565 /// \brief Computes the type- and value-dependence flags for this 566 /// declaration reference expression. 567 void computeDependence(); 568 569public: 570 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 571 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 572 computeDependence(); 573 } 574 575 /// \brief Construct an empty declaration reference expression. 576 explicit DeclRefExpr(EmptyShell Empty) 577 : Expr(DeclRefExprClass, Empty) { } 578 579 static DeclRefExpr *Create(ASTContext &Context, 580 NestedNameSpecifier *Qualifier, 581 SourceRange QualifierRange, 582 ValueDecl *D, 583 SourceLocation NameLoc, 584 QualType T, 585 const TemplateArgumentListInfo *TemplateArgs = 0); 586 587 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 588 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 589 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 590 591 SourceLocation getLocation() const { return Loc; } 592 void setLocation(SourceLocation L) { Loc = L; } 593 virtual SourceRange getSourceRange() const; 594 595 /// \brief Determine whether this declaration reference was preceded by a 596 /// C++ nested-name-specifier, e.g., \c N::foo. 597 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 598 599 /// \brief If the name was qualified, retrieves the source range of 600 /// the nested-name-specifier that precedes the name. Otherwise, 601 /// returns an empty source range. 602 SourceRange getQualifierRange() const { 603 if (!hasQualifier()) 604 return SourceRange(); 605 606 return getNameQualifier()->Range; 607 } 608 609 /// \brief If the name was qualified, retrieves the nested-name-specifier 610 /// that precedes the name. Otherwise, returns NULL. 611 NestedNameSpecifier *getQualifier() const { 612 if (!hasQualifier()) 613 return 0; 614 615 return getNameQualifier()->NNS; 616 } 617 618 /// \brief Determines whether this member expression actually had a C++ 619 /// template argument list explicitly specified, e.g., x.f<int>. 620 bool hasExplicitTemplateArgumentList() const { 621 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 622 } 623 624 /// \brief Copies the template arguments (if present) into the given 625 /// structure. 626 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 627 if (hasExplicitTemplateArgumentList()) 628 getExplicitTemplateArgumentList()->copyInto(List); 629 } 630 631 /// \brief Retrieve the location of the left angle bracket following the 632 /// member name ('<'), if any. 633 SourceLocation getLAngleLoc() const { 634 if (!hasExplicitTemplateArgumentList()) 635 return SourceLocation(); 636 637 return getExplicitTemplateArgumentList()->LAngleLoc; 638 } 639 640 /// \brief Retrieve the template arguments provided as part of this 641 /// template-id. 642 const TemplateArgumentLoc *getTemplateArgs() const { 643 if (!hasExplicitTemplateArgumentList()) 644 return 0; 645 646 return getExplicitTemplateArgumentList()->getTemplateArgs(); 647 } 648 649 /// \brief Retrieve the number of template arguments provided as part of this 650 /// template-id. 651 unsigned getNumTemplateArgs() const { 652 if (!hasExplicitTemplateArgumentList()) 653 return 0; 654 655 return getExplicitTemplateArgumentList()->NumTemplateArgs; 656 } 657 658 /// \brief Retrieve the location of the right angle bracket following the 659 /// template arguments ('>'). 660 SourceLocation getRAngleLoc() const { 661 if (!hasExplicitTemplateArgumentList()) 662 return SourceLocation(); 663 664 return getExplicitTemplateArgumentList()->RAngleLoc; 665 } 666 667 static bool classof(const Stmt *T) { 668 return T->getStmtClass() == DeclRefExprClass; 669 } 670 static bool classof(const DeclRefExpr *) { return true; } 671 672 // Iterators 673 virtual child_iterator child_begin(); 674 virtual child_iterator child_end(); 675}; 676 677/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 678class PredefinedExpr : public Expr { 679public: 680 enum IdentType { 681 Func, 682 Function, 683 PrettyFunction, 684 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 685 /// 'virtual' keyword is omitted for virtual member functions. 686 PrettyFunctionNoVirtual 687 }; 688 689private: 690 SourceLocation Loc; 691 IdentType Type; 692public: 693 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 694 : Expr(PredefinedExprClass, type, type->isDependentType(), 695 type->isDependentType()), Loc(l), Type(IT) {} 696 697 /// \brief Construct an empty predefined expression. 698 explicit PredefinedExpr(EmptyShell Empty) 699 : Expr(PredefinedExprClass, Empty) { } 700 701 IdentType getIdentType() const { return Type; } 702 void setIdentType(IdentType IT) { Type = IT; } 703 704 SourceLocation getLocation() const { return Loc; } 705 void setLocation(SourceLocation L) { Loc = L; } 706 707 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 708 709 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 710 711 static bool classof(const Stmt *T) { 712 return T->getStmtClass() == PredefinedExprClass; 713 } 714 static bool classof(const PredefinedExpr *) { return true; } 715 716 // Iterators 717 virtual child_iterator child_begin(); 718 virtual child_iterator child_end(); 719}; 720 721class IntegerLiteral : public Expr { 722 llvm::APInt Value; 723 SourceLocation Loc; 724public: 725 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 726 // or UnsignedLongLongTy 727 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 728 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 729 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 730 } 731 732 /// \brief Construct an empty integer literal. 733 explicit IntegerLiteral(EmptyShell Empty) 734 : Expr(IntegerLiteralClass, Empty) { } 735 736 const llvm::APInt &getValue() const { return Value; } 737 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 738 739 /// \brief Retrieve the location of the literal. 740 SourceLocation getLocation() const { return Loc; } 741 742 void setValue(const llvm::APInt &Val) { Value = Val; } 743 void setLocation(SourceLocation Location) { Loc = Location; } 744 745 static bool classof(const Stmt *T) { 746 return T->getStmtClass() == IntegerLiteralClass; 747 } 748 static bool classof(const IntegerLiteral *) { return true; } 749 750 // Iterators 751 virtual child_iterator child_begin(); 752 virtual child_iterator child_end(); 753}; 754 755class CharacterLiteral : public Expr { 756 unsigned Value; 757 SourceLocation Loc; 758 bool IsWide; 759public: 760 // type should be IntTy 761 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 762 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 763 IsWide(iswide) { 764 } 765 766 /// \brief Construct an empty character literal. 767 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 768 769 SourceLocation getLocation() const { return Loc; } 770 bool isWide() const { return IsWide; } 771 772 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 773 774 unsigned getValue() const { return Value; } 775 776 void setLocation(SourceLocation Location) { Loc = Location; } 777 void setWide(bool W) { IsWide = W; } 778 void setValue(unsigned Val) { Value = Val; } 779 780 static bool classof(const Stmt *T) { 781 return T->getStmtClass() == CharacterLiteralClass; 782 } 783 static bool classof(const CharacterLiteral *) { return true; } 784 785 // Iterators 786 virtual child_iterator child_begin(); 787 virtual child_iterator child_end(); 788}; 789 790class FloatingLiteral : public Expr { 791 llvm::APFloat Value; 792 bool IsExact : 1; 793 SourceLocation Loc; 794public: 795 FloatingLiteral(const llvm::APFloat &V, bool isexact, 796 QualType Type, SourceLocation L) 797 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 798 IsExact(isexact), Loc(L) {} 799 800 /// \brief Construct an empty floating-point literal. 801 explicit FloatingLiteral(EmptyShell Empty) 802 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 803 804 const llvm::APFloat &getValue() const { return Value; } 805 void setValue(const llvm::APFloat &Val) { Value = Val; } 806 807 bool isExact() const { return IsExact; } 808 void setExact(bool E) { IsExact = E; } 809 810 /// getValueAsApproximateDouble - This returns the value as an inaccurate 811 /// double. Note that this may cause loss of precision, but is useful for 812 /// debugging dumps, etc. 813 double getValueAsApproximateDouble() const; 814 815 SourceLocation getLocation() const { return Loc; } 816 void setLocation(SourceLocation L) { Loc = L; } 817 818 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 819 820 static bool classof(const Stmt *T) { 821 return T->getStmtClass() == FloatingLiteralClass; 822 } 823 static bool classof(const FloatingLiteral *) { return true; } 824 825 // Iterators 826 virtual child_iterator child_begin(); 827 virtual child_iterator child_end(); 828}; 829 830/// ImaginaryLiteral - We support imaginary integer and floating point literals, 831/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 832/// IntegerLiteral classes. Instances of this class always have a Complex type 833/// whose element type matches the subexpression. 834/// 835class ImaginaryLiteral : public Expr { 836 Stmt *Val; 837public: 838 ImaginaryLiteral(Expr *val, QualType Ty) 839 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 840 841 /// \brief Build an empty imaginary literal. 842 explicit ImaginaryLiteral(EmptyShell Empty) 843 : Expr(ImaginaryLiteralClass, Empty) { } 844 845 const Expr *getSubExpr() const { return cast<Expr>(Val); } 846 Expr *getSubExpr() { return cast<Expr>(Val); } 847 void setSubExpr(Expr *E) { Val = E; } 848 849 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 850 static bool classof(const Stmt *T) { 851 return T->getStmtClass() == ImaginaryLiteralClass; 852 } 853 static bool classof(const ImaginaryLiteral *) { return true; } 854 855 // Iterators 856 virtual child_iterator child_begin(); 857 virtual child_iterator child_end(); 858}; 859 860/// StringLiteral - This represents a string literal expression, e.g. "foo" 861/// or L"bar" (wide strings). The actual string is returned by getStrData() 862/// is NOT null-terminated, and the length of the string is determined by 863/// calling getByteLength(). The C type for a string is always a 864/// ConstantArrayType. In C++, the char type is const qualified, in C it is 865/// not. 866/// 867/// Note that strings in C can be formed by concatenation of multiple string 868/// literal pptokens in translation phase #6. This keeps track of the locations 869/// of each of these pieces. 870/// 871/// Strings in C can also be truncated and extended by assigning into arrays, 872/// e.g. with constructs like: 873/// char X[2] = "foobar"; 874/// In this case, getByteLength() will return 6, but the string literal will 875/// have type "char[2]". 876class StringLiteral : public Expr { 877 const char *StrData; 878 unsigned ByteLength; 879 bool IsWide; 880 unsigned NumConcatenated; 881 SourceLocation TokLocs[1]; 882 883 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 884 885protected: 886 virtual void DoDestroy(ASTContext &C); 887 888public: 889 /// This is the "fully general" constructor that allows representation of 890 /// strings formed from multiple concatenated tokens. 891 static StringLiteral *Create(ASTContext &C, const char *StrData, 892 unsigned ByteLength, bool Wide, QualType Ty, 893 const SourceLocation *Loc, unsigned NumStrs); 894 895 /// Simple constructor for string literals made from one token. 896 static StringLiteral *Create(ASTContext &C, const char *StrData, 897 unsigned ByteLength, 898 bool Wide, QualType Ty, SourceLocation Loc) { 899 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 900 } 901 902 /// \brief Construct an empty string literal. 903 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 904 905 llvm::StringRef getString() const { 906 return llvm::StringRef(StrData, ByteLength); 907 } 908 // FIXME: These are deprecated, replace with StringRef. 909 const char *getStrData() const { return StrData; } 910 unsigned getByteLength() const { return ByteLength; } 911 912 /// \brief Sets the string data to the given string data. 913 void setString(ASTContext &C, llvm::StringRef Str); 914 915 bool isWide() const { return IsWide; } 916 void setWide(bool W) { IsWide = W; } 917 918 bool containsNonAsciiOrNull() const { 919 llvm::StringRef Str = getString(); 920 for (unsigned i = 0, e = Str.size(); i != e; ++i) 921 if (!isascii(Str[i]) || !Str[i]) 922 return true; 923 return false; 924 } 925 /// getNumConcatenated - Get the number of string literal tokens that were 926 /// concatenated in translation phase #6 to form this string literal. 927 unsigned getNumConcatenated() const { return NumConcatenated; } 928 929 SourceLocation getStrTokenLoc(unsigned TokNum) const { 930 assert(TokNum < NumConcatenated && "Invalid tok number"); 931 return TokLocs[TokNum]; 932 } 933 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 934 assert(TokNum < NumConcatenated && "Invalid tok number"); 935 TokLocs[TokNum] = L; 936 } 937 938 typedef const SourceLocation *tokloc_iterator; 939 tokloc_iterator tokloc_begin() const { return TokLocs; } 940 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 941 942 virtual SourceRange getSourceRange() const { 943 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 944 } 945 static bool classof(const Stmt *T) { 946 return T->getStmtClass() == StringLiteralClass; 947 } 948 static bool classof(const StringLiteral *) { return true; } 949 950 // Iterators 951 virtual child_iterator child_begin(); 952 virtual child_iterator child_end(); 953}; 954 955/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 956/// AST node is only formed if full location information is requested. 957class ParenExpr : public Expr { 958 SourceLocation L, R; 959 Stmt *Val; 960public: 961 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 962 : Expr(ParenExprClass, val->getType(), 963 val->isTypeDependent(), val->isValueDependent()), 964 L(l), R(r), Val(val) {} 965 966 /// \brief Construct an empty parenthesized expression. 967 explicit ParenExpr(EmptyShell Empty) 968 : Expr(ParenExprClass, Empty) { } 969 970 const Expr *getSubExpr() const { return cast<Expr>(Val); } 971 Expr *getSubExpr() { return cast<Expr>(Val); } 972 void setSubExpr(Expr *E) { Val = E; } 973 974 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 975 976 /// \brief Get the location of the left parentheses '('. 977 SourceLocation getLParen() const { return L; } 978 void setLParen(SourceLocation Loc) { L = Loc; } 979 980 /// \brief Get the location of the right parentheses ')'. 981 SourceLocation getRParen() const { return R; } 982 void setRParen(SourceLocation Loc) { R = Loc; } 983 984 static bool classof(const Stmt *T) { 985 return T->getStmtClass() == ParenExprClass; 986 } 987 static bool classof(const ParenExpr *) { return true; } 988 989 // Iterators 990 virtual child_iterator child_begin(); 991 virtual child_iterator child_end(); 992}; 993 994 995/// UnaryOperator - This represents the unary-expression's (except sizeof and 996/// alignof), the postinc/postdec operators from postfix-expression, and various 997/// extensions. 998/// 999/// Notes on various nodes: 1000/// 1001/// Real/Imag - These return the real/imag part of a complex operand. If 1002/// applied to a non-complex value, the former returns its operand and the 1003/// later returns zero in the type of the operand. 1004/// 1005/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 1006/// subexpression is a compound literal with the various MemberExpr and 1007/// ArraySubscriptExpr's applied to it. (This is only used in C) 1008/// 1009class UnaryOperator : public Expr { 1010public: 1011 // Note that additions to this should also update the StmtVisitor class. 1012 enum Opcode { 1013 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 1014 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 1015 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 1016 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 1017 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 1018 Real, Imag, // "__real expr"/"__imag expr" Extension. 1019 Extension, // __extension__ marker. 1020 OffsetOf // __builtin_offsetof 1021 }; 1022private: 1023 Stmt *Val; 1024 Opcode Opc; 1025 SourceLocation Loc; 1026public: 1027 1028 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 1029 : Expr(UnaryOperatorClass, type, 1030 input->isTypeDependent() && opc != OffsetOf, 1031 input->isValueDependent()), 1032 Val(input), Opc(opc), Loc(l) {} 1033 1034 /// \brief Build an empty unary operator. 1035 explicit UnaryOperator(EmptyShell Empty) 1036 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 1037 1038 Opcode getOpcode() const { return Opc; } 1039 void setOpcode(Opcode O) { Opc = O; } 1040 1041 Expr *getSubExpr() const { return cast<Expr>(Val); } 1042 void setSubExpr(Expr *E) { Val = E; } 1043 1044 /// getOperatorLoc - Return the location of the operator. 1045 SourceLocation getOperatorLoc() const { return Loc; } 1046 void setOperatorLoc(SourceLocation L) { Loc = L; } 1047 1048 /// isPostfix - Return true if this is a postfix operation, like x++. 1049 static bool isPostfix(Opcode Op) { 1050 return Op == PostInc || Op == PostDec; 1051 } 1052 1053 /// isPostfix - Return true if this is a prefix operation, like --x. 1054 static bool isPrefix(Opcode Op) { 1055 return Op == PreInc || Op == PreDec; 1056 } 1057 1058 bool isPrefix() const { return isPrefix(Opc); } 1059 bool isPostfix() const { return isPostfix(Opc); } 1060 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 1061 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 1062 bool isOffsetOfOp() const { return Opc == OffsetOf; } 1063 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 1064 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 1065 1066 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1067 /// corresponds to, e.g. "sizeof" or "[pre]++" 1068 static const char *getOpcodeStr(Opcode Op); 1069 1070 /// \brief Retrieve the unary opcode that corresponds to the given 1071 /// overloaded operator. 1072 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1073 1074 /// \brief Retrieve the overloaded operator kind that corresponds to 1075 /// the given unary opcode. 1076 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1077 1078 virtual SourceRange getSourceRange() const { 1079 if (isPostfix()) 1080 return SourceRange(Val->getLocStart(), Loc); 1081 else 1082 return SourceRange(Loc, Val->getLocEnd()); 1083 } 1084 virtual SourceLocation getExprLoc() const { return Loc; } 1085 1086 static bool classof(const Stmt *T) { 1087 return T->getStmtClass() == UnaryOperatorClass; 1088 } 1089 static bool classof(const UnaryOperator *) { return true; } 1090 1091 // Iterators 1092 virtual child_iterator child_begin(); 1093 virtual child_iterator child_end(); 1094}; 1095 1096/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1097/// offsetof(record-type, member-designator). For example, given: 1098/// @code 1099/// struct S { 1100/// float f; 1101/// double d; 1102/// }; 1103/// struct T { 1104/// int i; 1105/// struct S s[10]; 1106/// }; 1107/// @endcode 1108/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1109 1110class OffsetOfExpr : public Expr { 1111public: 1112 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1113 class OffsetOfNode { 1114 public: 1115 /// \brief The kind of offsetof node we have. 1116 enum Kind { 1117 /// \brief An index into an array. 1118 Array = 0x00, 1119 /// \brief A field. 1120 Field = 0x01, 1121 /// \brief A field in a dependent type, known only by its name. 1122 Identifier = 0x02, 1123 /// \brief An implicit indirection through a C++ base class, when the 1124 /// field found is in a base class. 1125 Base = 0x03 1126 }; 1127 1128 private: 1129 enum { MaskBits = 2, Mask = 0x03 }; 1130 1131 /// \brief The source range that covers this part of the designator. 1132 SourceRange Range; 1133 1134 /// \brief The data describing the designator, which comes in three 1135 /// different forms, depending on the lower two bits. 1136 /// - An unsigned index into the array of Expr*'s stored after this node 1137 /// in memory, for [constant-expression] designators. 1138 /// - A FieldDecl*, for references to a known field. 1139 /// - An IdentifierInfo*, for references to a field with a given name 1140 /// when the class type is dependent. 1141 /// - A CXXBaseSpecifier*, for references that look at a field in a 1142 /// base class. 1143 uintptr_t Data; 1144 1145 public: 1146 /// \brief Create an offsetof node that refers to an array element. 1147 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1148 SourceLocation RBracketLoc) 1149 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1150 1151 /// \brief Create an offsetof node that refers to a field. 1152 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1153 SourceLocation NameLoc) 1154 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1155 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1156 1157 /// \brief Create an offsetof node that refers to an identifier. 1158 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1159 SourceLocation NameLoc) 1160 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1161 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1162 1163 /// \brief Create an offsetof node that refers into a C++ base class. 1164 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1165 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1166 1167 /// \brief Determine what kind of offsetof node this is. 1168 Kind getKind() const { 1169 return static_cast<Kind>(Data & Mask); 1170 } 1171 1172 /// \brief For an array element node, returns the index into the array 1173 /// of expressions. 1174 unsigned getArrayExprIndex() const { 1175 assert(getKind() == Array); 1176 return Data >> 2; 1177 } 1178 1179 /// \brief For a field offsetof node, returns the field. 1180 FieldDecl *getField() const { 1181 assert(getKind() == Field); 1182 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1183 } 1184 1185 /// \brief For a field or identifier offsetof node, returns the name of 1186 /// the field. 1187 IdentifierInfo *getFieldName() const; 1188 1189 /// \brief For a base class node, returns the base specifier. 1190 CXXBaseSpecifier *getBase() const { 1191 assert(getKind() == Base); 1192 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1193 } 1194 1195 /// \brief Retrieve the source range that covers this offsetof node. 1196 /// 1197 /// For an array element node, the source range contains the locations of 1198 /// the square brackets. For a field or identifier node, the source range 1199 /// contains the location of the period (if there is one) and the 1200 /// identifier. 1201 SourceRange getRange() const { return Range; } 1202 }; 1203 1204private: 1205 1206 SourceLocation OperatorLoc, RParenLoc; 1207 // Base type; 1208 TypeSourceInfo *TSInfo; 1209 // Number of sub-components (i.e. instances of OffsetOfNode). 1210 unsigned NumComps; 1211 // Number of sub-expressions (i.e. array subscript expressions). 1212 unsigned NumExprs; 1213 1214 OffsetOfExpr(ASTContext &C, QualType type, 1215 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1216 OffsetOfNode* compsPtr, unsigned numComps, 1217 Expr** exprsPtr, unsigned numExprs, 1218 SourceLocation RParenLoc); 1219 1220 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1221 : Expr(OffsetOfExprClass, EmptyShell()), 1222 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1223 1224public: 1225 1226 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1227 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1228 OffsetOfNode* compsPtr, unsigned numComps, 1229 Expr** exprsPtr, unsigned numExprs, 1230 SourceLocation RParenLoc); 1231 1232 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1233 unsigned NumComps, unsigned NumExprs); 1234 1235 /// getOperatorLoc - Return the location of the operator. 1236 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1237 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1238 1239 /// \brief Return the location of the right parentheses. 1240 SourceLocation getRParenLoc() const { return RParenLoc; } 1241 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1242 1243 TypeSourceInfo *getTypeSourceInfo() const { 1244 return TSInfo; 1245 } 1246 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1247 TSInfo = tsi; 1248 } 1249 1250 const OffsetOfNode &getComponent(unsigned Idx) { 1251 assert(Idx < NumComps && "Subscript out of range"); 1252 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1253 } 1254 1255 void setComponent(unsigned Idx, OffsetOfNode ON) { 1256 assert(Idx < NumComps && "Subscript out of range"); 1257 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1258 } 1259 1260 unsigned getNumComponents() const { 1261 return NumComps; 1262 } 1263 1264 Expr* getIndexExpr(unsigned Idx) { 1265 assert(Idx < NumExprs && "Subscript out of range"); 1266 return reinterpret_cast<Expr **>( 1267 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1268 } 1269 1270 void setIndexExpr(unsigned Idx, Expr* E) { 1271 assert(Idx < NumComps && "Subscript out of range"); 1272 reinterpret_cast<Expr **>( 1273 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1274 } 1275 1276 unsigned getNumExpressions() const { 1277 return NumExprs; 1278 } 1279 1280 virtual SourceRange getSourceRange() const { 1281 return SourceRange(OperatorLoc, RParenLoc); 1282 } 1283 1284 static bool classof(const Stmt *T) { 1285 return T->getStmtClass() == OffsetOfExprClass; 1286 } 1287 1288 static bool classof(const OffsetOfExpr *) { return true; } 1289 1290 // Iterators 1291 virtual child_iterator child_begin(); 1292 virtual child_iterator child_end(); 1293}; 1294 1295/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1296/// types and expressions. 1297class SizeOfAlignOfExpr : public Expr { 1298 bool isSizeof : 1; // true if sizeof, false if alignof. 1299 bool isType : 1; // true if operand is a type, false if an expression 1300 union { 1301 TypeSourceInfo *Ty; 1302 Stmt *Ex; 1303 } Argument; 1304 SourceLocation OpLoc, RParenLoc; 1305 1306protected: 1307 virtual void DoDestroy(ASTContext& C); 1308 1309public: 1310 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1311 QualType resultType, SourceLocation op, 1312 SourceLocation rp) : 1313 Expr(SizeOfAlignOfExprClass, resultType, 1314 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1315 // Value-dependent if the argument is type-dependent. 1316 TInfo->getType()->isDependentType()), 1317 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1318 Argument.Ty = TInfo; 1319 } 1320 1321 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1322 QualType resultType, SourceLocation op, 1323 SourceLocation rp) : 1324 Expr(SizeOfAlignOfExprClass, resultType, 1325 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1326 // Value-dependent if the argument is type-dependent. 1327 E->isTypeDependent()), 1328 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1329 Argument.Ex = E; 1330 } 1331 1332 /// \brief Construct an empty sizeof/alignof expression. 1333 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1334 : Expr(SizeOfAlignOfExprClass, Empty) { } 1335 1336 bool isSizeOf() const { return isSizeof; } 1337 void setSizeof(bool S) { isSizeof = S; } 1338 1339 bool isArgumentType() const { return isType; } 1340 QualType getArgumentType() const { 1341 return getArgumentTypeInfo()->getType(); 1342 } 1343 TypeSourceInfo *getArgumentTypeInfo() const { 1344 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1345 return Argument.Ty; 1346 } 1347 Expr *getArgumentExpr() { 1348 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1349 return static_cast<Expr*>(Argument.Ex); 1350 } 1351 const Expr *getArgumentExpr() const { 1352 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1353 } 1354 1355 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1356 void setArgument(TypeSourceInfo *TInfo) { 1357 Argument.Ty = TInfo; 1358 isType = true; 1359 } 1360 1361 /// Gets the argument type, or the type of the argument expression, whichever 1362 /// is appropriate. 1363 QualType getTypeOfArgument() const { 1364 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1365 } 1366 1367 SourceLocation getOperatorLoc() const { return OpLoc; } 1368 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1369 1370 SourceLocation getRParenLoc() const { return RParenLoc; } 1371 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1372 1373 virtual SourceRange getSourceRange() const { 1374 return SourceRange(OpLoc, RParenLoc); 1375 } 1376 1377 static bool classof(const Stmt *T) { 1378 return T->getStmtClass() == SizeOfAlignOfExprClass; 1379 } 1380 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1381 1382 // Iterators 1383 virtual child_iterator child_begin(); 1384 virtual child_iterator child_end(); 1385}; 1386 1387//===----------------------------------------------------------------------===// 1388// Postfix Operators. 1389//===----------------------------------------------------------------------===// 1390 1391/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1392class ArraySubscriptExpr : public Expr { 1393 enum { LHS, RHS, END_EXPR=2 }; 1394 Stmt* SubExprs[END_EXPR]; 1395 SourceLocation RBracketLoc; 1396public: 1397 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1398 SourceLocation rbracketloc) 1399 : Expr(ArraySubscriptExprClass, t, 1400 lhs->isTypeDependent() || rhs->isTypeDependent(), 1401 lhs->isValueDependent() || rhs->isValueDependent()), 1402 RBracketLoc(rbracketloc) { 1403 SubExprs[LHS] = lhs; 1404 SubExprs[RHS] = rhs; 1405 } 1406 1407 /// \brief Create an empty array subscript expression. 1408 explicit ArraySubscriptExpr(EmptyShell Shell) 1409 : Expr(ArraySubscriptExprClass, Shell) { } 1410 1411 /// An array access can be written A[4] or 4[A] (both are equivalent). 1412 /// - getBase() and getIdx() always present the normalized view: A[4]. 1413 /// In this case getBase() returns "A" and getIdx() returns "4". 1414 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1415 /// 4[A] getLHS() returns "4". 1416 /// Note: Because vector element access is also written A[4] we must 1417 /// predicate the format conversion in getBase and getIdx only on the 1418 /// the type of the RHS, as it is possible for the LHS to be a vector of 1419 /// integer type 1420 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1421 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1422 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1423 1424 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1425 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1426 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1427 1428 Expr *getBase() { 1429 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1430 } 1431 1432 const Expr *getBase() const { 1433 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1434 } 1435 1436 Expr *getIdx() { 1437 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1438 } 1439 1440 const Expr *getIdx() const { 1441 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1442 } 1443 1444 virtual SourceRange getSourceRange() const { 1445 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1446 } 1447 1448 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1449 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1450 1451 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1452 1453 static bool classof(const Stmt *T) { 1454 return T->getStmtClass() == ArraySubscriptExprClass; 1455 } 1456 static bool classof(const ArraySubscriptExpr *) { return true; } 1457 1458 // Iterators 1459 virtual child_iterator child_begin(); 1460 virtual child_iterator child_end(); 1461}; 1462 1463 1464/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1465/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1466/// while its subclasses may represent alternative syntax that (semantically) 1467/// results in a function call. For example, CXXOperatorCallExpr is 1468/// a subclass for overloaded operator calls that use operator syntax, e.g., 1469/// "str1 + str2" to resolve to a function call. 1470class CallExpr : public Expr { 1471 enum { FN=0, ARGS_START=1 }; 1472 Stmt **SubExprs; 1473 unsigned NumArgs; 1474 SourceLocation RParenLoc; 1475 1476protected: 1477 // This version of the constructor is for derived classes. 1478 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1479 QualType t, SourceLocation rparenloc); 1480 1481 virtual void DoDestroy(ASTContext& C); 1482 1483public: 1484 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1485 SourceLocation rparenloc); 1486 1487 /// \brief Build an empty call expression. 1488 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1489 1490 ~CallExpr() {} 1491 1492 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1493 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1494 void setCallee(Expr *F) { SubExprs[FN] = F; } 1495 1496 Decl *getCalleeDecl(); 1497 const Decl *getCalleeDecl() const { 1498 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1499 } 1500 1501 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1502 FunctionDecl *getDirectCallee(); 1503 const FunctionDecl *getDirectCallee() const { 1504 return const_cast<CallExpr*>(this)->getDirectCallee(); 1505 } 1506 1507 /// getNumArgs - Return the number of actual arguments to this call. 1508 /// 1509 unsigned getNumArgs() const { return NumArgs; } 1510 1511 /// getArg - Return the specified argument. 1512 Expr *getArg(unsigned Arg) { 1513 assert(Arg < NumArgs && "Arg access out of range!"); 1514 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1515 } 1516 const Expr *getArg(unsigned Arg) const { 1517 assert(Arg < NumArgs && "Arg access out of range!"); 1518 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1519 } 1520 1521 /// setArg - Set the specified argument. 1522 void setArg(unsigned Arg, Expr *ArgExpr) { 1523 assert(Arg < NumArgs && "Arg access out of range!"); 1524 SubExprs[Arg+ARGS_START] = ArgExpr; 1525 } 1526 1527 /// setNumArgs - This changes the number of arguments present in this call. 1528 /// Any orphaned expressions are deleted by this, and any new operands are set 1529 /// to null. 1530 void setNumArgs(ASTContext& C, unsigned NumArgs); 1531 1532 typedef ExprIterator arg_iterator; 1533 typedef ConstExprIterator const_arg_iterator; 1534 1535 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1536 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1537 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1538 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1539 1540 /// getNumCommas - Return the number of commas that must have been present in 1541 /// this function call. 1542 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1543 1544 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1545 /// not, return 0. 1546 unsigned isBuiltinCall(ASTContext &Context) const; 1547 1548 /// getCallReturnType - Get the return type of the call expr. This is not 1549 /// always the type of the expr itself, if the return type is a reference 1550 /// type. 1551 QualType getCallReturnType() const; 1552 1553 SourceLocation getRParenLoc() const { return RParenLoc; } 1554 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1555 1556 virtual SourceRange getSourceRange() const { 1557 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1558 } 1559 1560 static bool classof(const Stmt *T) { 1561 return T->getStmtClass() >= firstCallExprConstant && 1562 T->getStmtClass() <= lastCallExprConstant; 1563 } 1564 static bool classof(const CallExpr *) { return true; } 1565 1566 // Iterators 1567 virtual child_iterator child_begin(); 1568 virtual child_iterator child_end(); 1569}; 1570 1571/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1572/// 1573class MemberExpr : public Expr { 1574 /// Extra data stored in some member expressions. 1575 struct MemberNameQualifier : public NameQualifier { 1576 DeclAccessPair FoundDecl; 1577 }; 1578 1579 /// Base - the expression for the base pointer or structure references. In 1580 /// X.F, this is "X". 1581 Stmt *Base; 1582 1583 /// MemberDecl - This is the decl being referenced by the field/member name. 1584 /// In X.F, this is the decl referenced by F. 1585 ValueDecl *MemberDecl; 1586 1587 /// MemberLoc - This is the location of the member name. 1588 SourceLocation MemberLoc; 1589 1590 /// IsArrow - True if this is "X->F", false if this is "X.F". 1591 bool IsArrow : 1; 1592 1593 /// \brief True if this member expression used a nested-name-specifier to 1594 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1595 /// declaration. When true, a MemberNameQualifier 1596 /// structure is allocated immediately after the MemberExpr. 1597 bool HasQualifierOrFoundDecl : 1; 1598 1599 /// \brief True if this member expression specified a template argument list 1600 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1601 /// structure (and its TemplateArguments) are allocated immediately after 1602 /// the MemberExpr or, if the member expression also has a qualifier, after 1603 /// the MemberNameQualifier structure. 1604 bool HasExplicitTemplateArgumentList : 1; 1605 1606 /// \brief Retrieve the qualifier that preceded the member name, if any. 1607 MemberNameQualifier *getMemberQualifier() { 1608 assert(HasQualifierOrFoundDecl); 1609 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1610 } 1611 1612 /// \brief Retrieve the qualifier that preceded the member name, if any. 1613 const MemberNameQualifier *getMemberQualifier() const { 1614 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1615 } 1616 1617 /// \brief Retrieve the explicit template argument list that followed the 1618 /// member template name, if any. 1619 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1620 if (!HasExplicitTemplateArgumentList) 1621 return 0; 1622 1623 if (!HasQualifierOrFoundDecl) 1624 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1625 1626 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1627 getMemberQualifier() + 1); 1628 } 1629 1630 /// \brief Retrieve the explicit template argument list that followed the 1631 /// member template name, if any. 1632 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1633 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1634 } 1635 1636public: 1637 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1638 SourceLocation l, QualType ty) 1639 : Expr(MemberExprClass, ty, 1640 base->isTypeDependent(), base->isValueDependent()), 1641 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1642 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1643 1644 /// \brief Build an empty member reference expression. 1645 explicit MemberExpr(EmptyShell Empty) 1646 : Expr(MemberExprClass, Empty), HasQualifierOrFoundDecl(false), 1647 HasExplicitTemplateArgumentList(false) { } 1648 1649 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1650 NestedNameSpecifier *qual, SourceRange qualrange, 1651 ValueDecl *memberdecl, DeclAccessPair founddecl, 1652 SourceLocation l, 1653 const TemplateArgumentListInfo *targs, 1654 QualType ty); 1655 1656 void setBase(Expr *E) { Base = E; } 1657 Expr *getBase() const { return cast<Expr>(Base); } 1658 1659 /// \brief Retrieve the member declaration to which this expression refers. 1660 /// 1661 /// The returned declaration will either be a FieldDecl or (in C++) 1662 /// a CXXMethodDecl. 1663 ValueDecl *getMemberDecl() const { return MemberDecl; } 1664 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1665 1666 /// \brief Retrieves the declaration found by lookup. 1667 DeclAccessPair getFoundDecl() const { 1668 if (!HasQualifierOrFoundDecl) 1669 return DeclAccessPair::make(getMemberDecl(), 1670 getMemberDecl()->getAccess()); 1671 return getMemberQualifier()->FoundDecl; 1672 } 1673 1674 /// \brief Determines whether this member expression actually had 1675 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1676 /// x->Base::foo. 1677 bool hasQualifier() const { return getQualifier() != 0; } 1678 1679 /// \brief If the member name was qualified, retrieves the source range of 1680 /// the nested-name-specifier that precedes the member name. Otherwise, 1681 /// returns an empty source range. 1682 SourceRange getQualifierRange() const { 1683 if (!HasQualifierOrFoundDecl) 1684 return SourceRange(); 1685 1686 return getMemberQualifier()->Range; 1687 } 1688 1689 /// \brief If the member name was qualified, retrieves the 1690 /// nested-name-specifier that precedes the member name. Otherwise, returns 1691 /// NULL. 1692 NestedNameSpecifier *getQualifier() const { 1693 if (!HasQualifierOrFoundDecl) 1694 return 0; 1695 1696 return getMemberQualifier()->NNS; 1697 } 1698 1699 /// \brief Determines whether this member expression actually had a C++ 1700 /// template argument list explicitly specified, e.g., x.f<int>. 1701 bool hasExplicitTemplateArgumentList() const { 1702 return HasExplicitTemplateArgumentList; 1703 } 1704 1705 /// \brief Copies the template arguments (if present) into the given 1706 /// structure. 1707 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1708 if (hasExplicitTemplateArgumentList()) 1709 getExplicitTemplateArgumentList()->copyInto(List); 1710 } 1711 1712 /// \brief Retrieve the location of the left angle bracket following the 1713 /// member name ('<'), if any. 1714 SourceLocation getLAngleLoc() const { 1715 if (!HasExplicitTemplateArgumentList) 1716 return SourceLocation(); 1717 1718 return getExplicitTemplateArgumentList()->LAngleLoc; 1719 } 1720 1721 /// \brief Retrieve the template arguments provided as part of this 1722 /// template-id. 1723 const TemplateArgumentLoc *getTemplateArgs() const { 1724 if (!HasExplicitTemplateArgumentList) 1725 return 0; 1726 1727 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1728 } 1729 1730 /// \brief Retrieve the number of template arguments provided as part of this 1731 /// template-id. 1732 unsigned getNumTemplateArgs() const { 1733 if (!HasExplicitTemplateArgumentList) 1734 return 0; 1735 1736 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1737 } 1738 1739 /// \brief Retrieve the location of the right angle bracket following the 1740 /// template arguments ('>'). 1741 SourceLocation getRAngleLoc() const { 1742 if (!HasExplicitTemplateArgumentList) 1743 return SourceLocation(); 1744 1745 return getExplicitTemplateArgumentList()->RAngleLoc; 1746 } 1747 1748 bool isArrow() const { return IsArrow; } 1749 void setArrow(bool A) { IsArrow = A; } 1750 1751 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1752 /// location of 'F'. 1753 SourceLocation getMemberLoc() const { return MemberLoc; } 1754 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1755 1756 virtual SourceRange getSourceRange() const { 1757 // If we have an implicit base (like a C++ implicit this), 1758 // make sure not to return its location 1759 SourceLocation EndLoc = MemberLoc; 1760 if (HasExplicitTemplateArgumentList) 1761 EndLoc = getRAngleLoc(); 1762 1763 SourceLocation BaseLoc = getBase()->getLocStart(); 1764 if (BaseLoc.isInvalid()) 1765 return SourceRange(MemberLoc, EndLoc); 1766 return SourceRange(BaseLoc, EndLoc); 1767 } 1768 1769 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1770 1771 static bool classof(const Stmt *T) { 1772 return T->getStmtClass() == MemberExprClass; 1773 } 1774 static bool classof(const MemberExpr *) { return true; } 1775 1776 // Iterators 1777 virtual child_iterator child_begin(); 1778 virtual child_iterator child_end(); 1779}; 1780 1781/// CompoundLiteralExpr - [C99 6.5.2.5] 1782/// 1783class CompoundLiteralExpr : public Expr { 1784 /// LParenLoc - If non-null, this is the location of the left paren in a 1785 /// compound literal like "(int){4}". This can be null if this is a 1786 /// synthesized compound expression. 1787 SourceLocation LParenLoc; 1788 1789 /// The type as written. This can be an incomplete array type, in 1790 /// which case the actual expression type will be different. 1791 TypeSourceInfo *TInfo; 1792 Stmt *Init; 1793 bool FileScope; 1794public: 1795 // FIXME: Can compound literals be value-dependent? 1796 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1797 QualType T, Expr *init, bool fileScope) 1798 : Expr(CompoundLiteralExprClass, T, 1799 tinfo->getType()->isDependentType(), false), 1800 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1801 1802 /// \brief Construct an empty compound literal. 1803 explicit CompoundLiteralExpr(EmptyShell Empty) 1804 : Expr(CompoundLiteralExprClass, Empty) { } 1805 1806 const Expr *getInitializer() const { return cast<Expr>(Init); } 1807 Expr *getInitializer() { return cast<Expr>(Init); } 1808 void setInitializer(Expr *E) { Init = E; } 1809 1810 bool isFileScope() const { return FileScope; } 1811 void setFileScope(bool FS) { FileScope = FS; } 1812 1813 SourceLocation getLParenLoc() const { return LParenLoc; } 1814 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1815 1816 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1817 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1818 1819 virtual SourceRange getSourceRange() const { 1820 // FIXME: Init should never be null. 1821 if (!Init) 1822 return SourceRange(); 1823 if (LParenLoc.isInvalid()) 1824 return Init->getSourceRange(); 1825 return SourceRange(LParenLoc, Init->getLocEnd()); 1826 } 1827 1828 static bool classof(const Stmt *T) { 1829 return T->getStmtClass() == CompoundLiteralExprClass; 1830 } 1831 static bool classof(const CompoundLiteralExpr *) { return true; } 1832 1833 // Iterators 1834 virtual child_iterator child_begin(); 1835 virtual child_iterator child_end(); 1836}; 1837 1838/// CastExpr - Base class for type casts, including both implicit 1839/// casts (ImplicitCastExpr) and explicit casts that have some 1840/// representation in the source code (ExplicitCastExpr's derived 1841/// classes). 1842class CastExpr : public Expr { 1843public: 1844 /// CastKind - the kind of cast this represents. 1845 enum CastKind { 1846 /// CK_Unknown - Unknown cast kind. 1847 /// FIXME: The goal is to get rid of this and make all casts have a 1848 /// kind so that the AST client doesn't have to try to figure out what's 1849 /// going on. 1850 CK_Unknown, 1851 1852 /// CK_BitCast - Used for reinterpret_cast. 1853 CK_BitCast, 1854 1855 /// CK_NoOp - Used for const_cast. 1856 CK_NoOp, 1857 1858 /// CK_BaseToDerived - Base to derived class casts. 1859 CK_BaseToDerived, 1860 1861 /// CK_DerivedToBase - Derived to base class casts. 1862 CK_DerivedToBase, 1863 1864 /// CK_UncheckedDerivedToBase - Derived to base class casts that 1865 /// assume that the derived pointer is not null. 1866 CK_UncheckedDerivedToBase, 1867 1868 /// CK_Dynamic - Dynamic cast. 1869 CK_Dynamic, 1870 1871 /// CK_ToUnion - Cast to union (GCC extension). 1872 CK_ToUnion, 1873 1874 /// CK_ArrayToPointerDecay - Array to pointer decay. 1875 CK_ArrayToPointerDecay, 1876 1877 // CK_FunctionToPointerDecay - Function to pointer decay. 1878 CK_FunctionToPointerDecay, 1879 1880 /// CK_NullToMemberPointer - Null pointer to member pointer. 1881 CK_NullToMemberPointer, 1882 1883 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1884 /// member pointer in derived class. 1885 CK_BaseToDerivedMemberPointer, 1886 1887 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1888 /// member pointer in base class. 1889 CK_DerivedToBaseMemberPointer, 1890 1891 /// CK_UserDefinedConversion - Conversion using a user defined type 1892 /// conversion function. 1893 CK_UserDefinedConversion, 1894 1895 /// CK_ConstructorConversion - Conversion by constructor 1896 CK_ConstructorConversion, 1897 1898 /// CK_IntegralToPointer - Integral to pointer 1899 CK_IntegralToPointer, 1900 1901 /// CK_PointerToIntegral - Pointer to integral 1902 CK_PointerToIntegral, 1903 1904 /// CK_ToVoid - Cast to void. 1905 CK_ToVoid, 1906 1907 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1908 /// vector type with the same element type as the src type. Splats the 1909 /// src expression into the destination expression. 1910 CK_VectorSplat, 1911 1912 /// CK_IntegralCast - Casting between integral types of different size. 1913 CK_IntegralCast, 1914 1915 /// CK_IntegralToFloating - Integral to floating point. 1916 CK_IntegralToFloating, 1917 1918 /// CK_FloatingToIntegral - Floating point to integral. 1919 CK_FloatingToIntegral, 1920 1921 /// CK_FloatingCast - Casting between floating types of different size. 1922 CK_FloatingCast, 1923 1924 /// CK_MemberPointerToBoolean - Member pointer to boolean 1925 CK_MemberPointerToBoolean, 1926 1927 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1928 /// pointer 1929 CK_AnyPointerToObjCPointerCast, 1930 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1931 /// pointer 1932 CK_AnyPointerToBlockPointerCast 1933 1934 }; 1935 1936private: 1937 CastKind Kind; 1938 Stmt *Op; 1939 1940 /// BasePath - For derived-to-base and base-to-derived casts, the base array 1941 /// contains the inheritance path. 1942 CXXBaseSpecifierArray BasePath; 1943 1944 void CheckBasePath() const { 1945#ifndef NDEBUG 1946 switch (getCastKind()) { 1947 case CK_DerivedToBase: 1948 case CK_UncheckedDerivedToBase: 1949 case CK_DerivedToBaseMemberPointer: 1950 case CK_BaseToDerived: 1951 case CK_BaseToDerivedMemberPointer: 1952 assert(!BasePath.empty() && "Cast kind should have a base path!"); 1953 break; 1954 1955 // These should not have an inheritance path. 1956 case CK_Unknown: 1957 case CK_BitCast: 1958 case CK_NoOp: 1959 case CK_Dynamic: 1960 case CK_ToUnion: 1961 case CK_ArrayToPointerDecay: 1962 case CK_FunctionToPointerDecay: 1963 case CK_NullToMemberPointer: 1964 case CK_UserDefinedConversion: 1965 case CK_ConstructorConversion: 1966 case CK_IntegralToPointer: 1967 case CK_PointerToIntegral: 1968 case CK_ToVoid: 1969 case CK_VectorSplat: 1970 case CK_IntegralCast: 1971 case CK_IntegralToFloating: 1972 case CK_FloatingToIntegral: 1973 case CK_FloatingCast: 1974 case CK_MemberPointerToBoolean: 1975 case CK_AnyPointerToObjCPointerCast: 1976 case CK_AnyPointerToBlockPointerCast: 1977 assert(BasePath.empty() && "Cast kind should not have a base path!"); 1978 break; 1979 } 1980#endif 1981 } 1982 1983protected: 1984 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1985 CXXBaseSpecifierArray BasePath) : 1986 Expr(SC, ty, 1987 // Cast expressions are type-dependent if the type is 1988 // dependent (C++ [temp.dep.expr]p3). 1989 ty->isDependentType(), 1990 // Cast expressions are value-dependent if the type is 1991 // dependent or if the subexpression is value-dependent. 1992 ty->isDependentType() || (op && op->isValueDependent())), 1993 Kind(kind), Op(op), BasePath(BasePath) { 1994 CheckBasePath(); 1995 } 1996 1997 /// \brief Construct an empty cast. 1998 CastExpr(StmtClass SC, EmptyShell Empty) 1999 : Expr(SC, Empty) { } 2000 2001 virtual void DoDestroy(ASTContext &C); 2002 2003public: 2004 CastKind getCastKind() const { return Kind; } 2005 void setCastKind(CastKind K) { Kind = K; } 2006 const char *getCastKindName() const; 2007 2008 Expr *getSubExpr() { return cast<Expr>(Op); } 2009 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2010 void setSubExpr(Expr *E) { Op = E; } 2011 2012 /// \brief Retrieve the cast subexpression as it was written in the source 2013 /// code, looking through any implicit casts or other intermediate nodes 2014 /// introduced by semantic analysis. 2015 Expr *getSubExprAsWritten(); 2016 const Expr *getSubExprAsWritten() const { 2017 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2018 } 2019 2020 const CXXBaseSpecifierArray& getBasePath() const { return BasePath; } 2021 CXXBaseSpecifierArray& getBasePath() { return BasePath; } 2022 2023 static bool classof(const Stmt *T) { 2024 return T->getStmtClass() >= firstCastExprConstant && 2025 T->getStmtClass() <= lastCastExprConstant; 2026 } 2027 static bool classof(const CastExpr *) { return true; } 2028 2029 // Iterators 2030 virtual child_iterator child_begin(); 2031 virtual child_iterator child_end(); 2032}; 2033 2034/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2035/// conversions, which have no direct representation in the original 2036/// source code. For example: converting T[]->T*, void f()->void 2037/// (*f)(), float->double, short->int, etc. 2038/// 2039/// In C, implicit casts always produce rvalues. However, in C++, an 2040/// implicit cast whose result is being bound to a reference will be 2041/// an lvalue. For example: 2042/// 2043/// @code 2044/// class Base { }; 2045/// class Derived : public Base { }; 2046/// void f(Derived d) { 2047/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 2048/// } 2049/// @endcode 2050class ImplicitCastExpr : public CastExpr { 2051 /// LvalueCast - Whether this cast produces an lvalue. 2052 bool LvalueCast; 2053 2054public: 2055 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2056 CXXBaseSpecifierArray BasePath, bool Lvalue) 2057 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePath), 2058 LvalueCast(Lvalue) { } 2059 2060 /// \brief Construct an empty implicit cast. 2061 explicit ImplicitCastExpr(EmptyShell Shell) 2062 : CastExpr(ImplicitCastExprClass, Shell) { } 2063 2064 virtual SourceRange getSourceRange() const { 2065 return getSubExpr()->getSourceRange(); 2066 } 2067 2068 /// isLvalueCast - Whether this cast produces an lvalue. 2069 bool isLvalueCast() const { return LvalueCast; } 2070 2071 /// setLvalueCast - Set whether this cast produces an lvalue. 2072 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 2073 2074 static bool classof(const Stmt *T) { 2075 return T->getStmtClass() == ImplicitCastExprClass; 2076 } 2077 static bool classof(const ImplicitCastExpr *) { return true; } 2078}; 2079 2080/// ExplicitCastExpr - An explicit cast written in the source 2081/// code. 2082/// 2083/// This class is effectively an abstract class, because it provides 2084/// the basic representation of an explicitly-written cast without 2085/// specifying which kind of cast (C cast, functional cast, static 2086/// cast, etc.) was written; specific derived classes represent the 2087/// particular style of cast and its location information. 2088/// 2089/// Unlike implicit casts, explicit cast nodes have two different 2090/// types: the type that was written into the source code, and the 2091/// actual type of the expression as determined by semantic 2092/// analysis. These types may differ slightly. For example, in C++ one 2093/// can cast to a reference type, which indicates that the resulting 2094/// expression will be an lvalue. The reference type, however, will 2095/// not be used as the type of the expression. 2096class ExplicitCastExpr : public CastExpr { 2097 /// TInfo - Source type info for the (written) type 2098 /// this expression is casting to. 2099 TypeSourceInfo *TInfo; 2100 2101protected: 2102 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2103 Expr *op, CXXBaseSpecifierArray BasePath, 2104 TypeSourceInfo *writtenTy) 2105 : CastExpr(SC, exprTy, kind, op, BasePath), TInfo(writtenTy) {} 2106 2107 /// \brief Construct an empty explicit cast. 2108 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 2109 : CastExpr(SC, Shell) { } 2110 2111public: 2112 /// getTypeInfoAsWritten - Returns the type source info for the type 2113 /// that this expression is casting to. 2114 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2115 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2116 2117 /// getTypeAsWritten - Returns the type that this expression is 2118 /// casting to, as written in the source code. 2119 QualType getTypeAsWritten() const { return TInfo->getType(); } 2120 2121 static bool classof(const Stmt *T) { 2122 return T->getStmtClass() >= firstExplicitCastExprConstant && 2123 T->getStmtClass() <= lastExplicitCastExprConstant; 2124 } 2125 static bool classof(const ExplicitCastExpr *) { return true; } 2126}; 2127 2128/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2129/// cast in C++ (C++ [expr.cast]), which uses the syntax 2130/// (Type)expr. For example: @c (int)f. 2131class CStyleCastExpr : public ExplicitCastExpr { 2132 SourceLocation LPLoc; // the location of the left paren 2133 SourceLocation RPLoc; // the location of the right paren 2134public: 2135 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2136 CXXBaseSpecifierArray BasePath, TypeSourceInfo *writtenTy, 2137 SourceLocation l, SourceLocation r) 2138 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, BasePath, 2139 writtenTy), LPLoc(l), RPLoc(r) {} 2140 2141 /// \brief Construct an empty C-style explicit cast. 2142 explicit CStyleCastExpr(EmptyShell Shell) 2143 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 2144 2145 SourceLocation getLParenLoc() const { return LPLoc; } 2146 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2147 2148 SourceLocation getRParenLoc() const { return RPLoc; } 2149 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2150 2151 virtual SourceRange getSourceRange() const { 2152 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2153 } 2154 static bool classof(const Stmt *T) { 2155 return T->getStmtClass() == CStyleCastExprClass; 2156 } 2157 static bool classof(const CStyleCastExpr *) { return true; } 2158}; 2159 2160/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2161/// 2162/// This expression node kind describes a builtin binary operation, 2163/// such as "x + y" for integer values "x" and "y". The operands will 2164/// already have been converted to appropriate types (e.g., by 2165/// performing promotions or conversions). 2166/// 2167/// In C++, where operators may be overloaded, a different kind of 2168/// expression node (CXXOperatorCallExpr) is used to express the 2169/// invocation of an overloaded operator with operator syntax. Within 2170/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2171/// used to store an expression "x + y" depends on the subexpressions 2172/// for x and y. If neither x or y is type-dependent, and the "+" 2173/// operator resolves to a built-in operation, BinaryOperator will be 2174/// used to express the computation (x and y may still be 2175/// value-dependent). If either x or y is type-dependent, or if the 2176/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2177/// be used to express the computation. 2178class BinaryOperator : public Expr { 2179public: 2180 enum Opcode { 2181 // Operators listed in order of precedence. 2182 // Note that additions to this should also update the StmtVisitor class. 2183 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 2184 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 2185 Add, Sub, // [C99 6.5.6] Additive operators. 2186 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 2187 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 2188 EQ, NE, // [C99 6.5.9] Equality operators. 2189 And, // [C99 6.5.10] Bitwise AND operator. 2190 Xor, // [C99 6.5.11] Bitwise XOR operator. 2191 Or, // [C99 6.5.12] Bitwise OR operator. 2192 LAnd, // [C99 6.5.13] Logical AND operator. 2193 LOr, // [C99 6.5.14] Logical OR operator. 2194 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 2195 DivAssign, RemAssign, 2196 AddAssign, SubAssign, 2197 ShlAssign, ShrAssign, 2198 AndAssign, XorAssign, 2199 OrAssign, 2200 Comma // [C99 6.5.17] Comma operator. 2201 }; 2202private: 2203 enum { LHS, RHS, END_EXPR }; 2204 Stmt* SubExprs[END_EXPR]; 2205 Opcode Opc; 2206 SourceLocation OpLoc; 2207public: 2208 2209 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2210 SourceLocation opLoc) 2211 : Expr(BinaryOperatorClass, ResTy, 2212 lhs->isTypeDependent() || rhs->isTypeDependent(), 2213 lhs->isValueDependent() || rhs->isValueDependent()), 2214 Opc(opc), OpLoc(opLoc) { 2215 SubExprs[LHS] = lhs; 2216 SubExprs[RHS] = rhs; 2217 assert(!isCompoundAssignmentOp() && 2218 "Use ArithAssignBinaryOperator for compound assignments"); 2219 } 2220 2221 /// \brief Construct an empty binary operator. 2222 explicit BinaryOperator(EmptyShell Empty) 2223 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 2224 2225 SourceLocation getOperatorLoc() const { return OpLoc; } 2226 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2227 2228 Opcode getOpcode() const { return Opc; } 2229 void setOpcode(Opcode O) { Opc = O; } 2230 2231 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2232 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2233 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2234 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2235 2236 virtual SourceRange getSourceRange() const { 2237 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2238 } 2239 2240 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2241 /// corresponds to, e.g. "<<=". 2242 static const char *getOpcodeStr(Opcode Op); 2243 2244 /// \brief Retrieve the binary opcode that corresponds to the given 2245 /// overloaded operator. 2246 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2247 2248 /// \brief Retrieve the overloaded operator kind that corresponds to 2249 /// the given binary opcode. 2250 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2251 2252 /// predicates to categorize the respective opcodes. 2253 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 2254 static bool isAdditiveOp(Opcode Opc) { return Opc == Add || Opc == Sub; } 2255 bool isAdditiveOp() const { return isAdditiveOp(Opc); } 2256 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 2257 bool isShiftOp() const { return isShiftOp(Opc); } 2258 2259 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 2260 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 2261 2262 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 2263 bool isRelationalOp() const { return isRelationalOp(Opc); } 2264 2265 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 2266 bool isEqualityOp() const { return isEqualityOp(Opc); } 2267 2268 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 2269 bool isComparisonOp() const { return isComparisonOp(Opc); } 2270 2271 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 2272 bool isLogicalOp() const { return isLogicalOp(Opc); } 2273 2274 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 2275 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 2276 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 2277 2278 static bool classof(const Stmt *S) { 2279 return S->getStmtClass() >= firstBinaryOperatorConstant && 2280 S->getStmtClass() <= lastBinaryOperatorConstant; 2281 } 2282 static bool classof(const BinaryOperator *) { return true; } 2283 2284 // Iterators 2285 virtual child_iterator child_begin(); 2286 virtual child_iterator child_end(); 2287 2288protected: 2289 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2290 SourceLocation opLoc, bool dead) 2291 : Expr(CompoundAssignOperatorClass, ResTy, 2292 lhs->isTypeDependent() || rhs->isTypeDependent(), 2293 lhs->isValueDependent() || rhs->isValueDependent()), 2294 Opc(opc), OpLoc(opLoc) { 2295 SubExprs[LHS] = lhs; 2296 SubExprs[RHS] = rhs; 2297 } 2298 2299 BinaryOperator(StmtClass SC, EmptyShell Empty) 2300 : Expr(SC, Empty), Opc(MulAssign) { } 2301}; 2302 2303/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2304/// track of the type the operation is performed in. Due to the semantics of 2305/// these operators, the operands are promoted, the aritmetic performed, an 2306/// implicit conversion back to the result type done, then the assignment takes 2307/// place. This captures the intermediate type which the computation is done 2308/// in. 2309class CompoundAssignOperator : public BinaryOperator { 2310 QualType ComputationLHSType; 2311 QualType ComputationResultType; 2312public: 2313 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2314 QualType ResType, QualType CompLHSType, 2315 QualType CompResultType, 2316 SourceLocation OpLoc) 2317 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2318 ComputationLHSType(CompLHSType), 2319 ComputationResultType(CompResultType) { 2320 assert(isCompoundAssignmentOp() && 2321 "Only should be used for compound assignments"); 2322 } 2323 2324 /// \brief Build an empty compound assignment operator expression. 2325 explicit CompoundAssignOperator(EmptyShell Empty) 2326 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2327 2328 // The two computation types are the type the LHS is converted 2329 // to for the computation and the type of the result; the two are 2330 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2331 QualType getComputationLHSType() const { return ComputationLHSType; } 2332 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2333 2334 QualType getComputationResultType() const { return ComputationResultType; } 2335 void setComputationResultType(QualType T) { ComputationResultType = T; } 2336 2337 static bool classof(const CompoundAssignOperator *) { return true; } 2338 static bool classof(const Stmt *S) { 2339 return S->getStmtClass() == CompoundAssignOperatorClass; 2340 } 2341}; 2342 2343/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2344/// GNU "missing LHS" extension is in use. 2345/// 2346class ConditionalOperator : public Expr { 2347 enum { COND, LHS, RHS, END_EXPR }; 2348 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2349 SourceLocation QuestionLoc, ColonLoc; 2350public: 2351 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2352 SourceLocation CLoc, Expr *rhs, QualType t) 2353 : Expr(ConditionalOperatorClass, t, 2354 // FIXME: the type of the conditional operator doesn't 2355 // depend on the type of the conditional, but the standard 2356 // seems to imply that it could. File a bug! 2357 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2358 (cond->isValueDependent() || 2359 (lhs && lhs->isValueDependent()) || 2360 (rhs && rhs->isValueDependent()))), 2361 QuestionLoc(QLoc), 2362 ColonLoc(CLoc) { 2363 SubExprs[COND] = cond; 2364 SubExprs[LHS] = lhs; 2365 SubExprs[RHS] = rhs; 2366 } 2367 2368 /// \brief Build an empty conditional operator. 2369 explicit ConditionalOperator(EmptyShell Empty) 2370 : Expr(ConditionalOperatorClass, Empty) { } 2371 2372 // getCond - Return the expression representing the condition for 2373 // the ?: operator. 2374 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2375 void setCond(Expr *E) { SubExprs[COND] = E; } 2376 2377 // getTrueExpr - Return the subexpression representing the value of the ?: 2378 // expression if the condition evaluates to true. In most cases this value 2379 // will be the same as getLHS() except a GCC extension allows the left 2380 // subexpression to be omitted, and instead of the condition be returned. 2381 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2382 // is only evaluated once. 2383 Expr *getTrueExpr() const { 2384 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2385 } 2386 2387 // getTrueExpr - Return the subexpression representing the value of the ?: 2388 // expression if the condition evaluates to false. This is the same as getRHS. 2389 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2390 2391 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2392 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2393 2394 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2395 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2396 2397 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2398 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2399 2400 SourceLocation getColonLoc() const { return ColonLoc; } 2401 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2402 2403 virtual SourceRange getSourceRange() const { 2404 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2405 } 2406 static bool classof(const Stmt *T) { 2407 return T->getStmtClass() == ConditionalOperatorClass; 2408 } 2409 static bool classof(const ConditionalOperator *) { return true; } 2410 2411 // Iterators 2412 virtual child_iterator child_begin(); 2413 virtual child_iterator child_end(); 2414}; 2415 2416/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2417class AddrLabelExpr : public Expr { 2418 SourceLocation AmpAmpLoc, LabelLoc; 2419 LabelStmt *Label; 2420public: 2421 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2422 QualType t) 2423 : Expr(AddrLabelExprClass, t, false, false), 2424 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2425 2426 /// \brief Build an empty address of a label expression. 2427 explicit AddrLabelExpr(EmptyShell Empty) 2428 : Expr(AddrLabelExprClass, Empty) { } 2429 2430 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2431 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2432 SourceLocation getLabelLoc() const { return LabelLoc; } 2433 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2434 2435 virtual SourceRange getSourceRange() const { 2436 return SourceRange(AmpAmpLoc, LabelLoc); 2437 } 2438 2439 LabelStmt *getLabel() const { return Label; } 2440 void setLabel(LabelStmt *S) { Label = S; } 2441 2442 static bool classof(const Stmt *T) { 2443 return T->getStmtClass() == AddrLabelExprClass; 2444 } 2445 static bool classof(const AddrLabelExpr *) { return true; } 2446 2447 // Iterators 2448 virtual child_iterator child_begin(); 2449 virtual child_iterator child_end(); 2450}; 2451 2452/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2453/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2454/// takes the value of the last subexpression. 2455class StmtExpr : public Expr { 2456 Stmt *SubStmt; 2457 SourceLocation LParenLoc, RParenLoc; 2458public: 2459 // FIXME: Does type-dependence need to be computed differently? 2460 StmtExpr(CompoundStmt *substmt, QualType T, 2461 SourceLocation lp, SourceLocation rp) : 2462 Expr(StmtExprClass, T, T->isDependentType(), false), 2463 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2464 2465 /// \brief Build an empty statement expression. 2466 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2467 2468 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2469 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2470 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2471 2472 virtual SourceRange getSourceRange() const { 2473 return SourceRange(LParenLoc, RParenLoc); 2474 } 2475 2476 SourceLocation getLParenLoc() const { return LParenLoc; } 2477 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2478 SourceLocation getRParenLoc() const { return RParenLoc; } 2479 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2480 2481 static bool classof(const Stmt *T) { 2482 return T->getStmtClass() == StmtExprClass; 2483 } 2484 static bool classof(const StmtExpr *) { return true; } 2485 2486 // Iterators 2487 virtual child_iterator child_begin(); 2488 virtual child_iterator child_end(); 2489}; 2490 2491/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2492/// This AST node represents a function that returns 1 if two *types* (not 2493/// expressions) are compatible. The result of this built-in function can be 2494/// used in integer constant expressions. 2495class TypesCompatibleExpr : public Expr { 2496 QualType Type1; 2497 QualType Type2; 2498 SourceLocation BuiltinLoc, RParenLoc; 2499public: 2500 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2501 QualType t1, QualType t2, SourceLocation RP) : 2502 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2503 Type1(t1), Type2(t2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2504 2505 /// \brief Build an empty __builtin_type_compatible_p expression. 2506 explicit TypesCompatibleExpr(EmptyShell Empty) 2507 : Expr(TypesCompatibleExprClass, Empty) { } 2508 2509 QualType getArgType1() const { return Type1; } 2510 void setArgType1(QualType T) { Type1 = T; } 2511 QualType getArgType2() const { return Type2; } 2512 void setArgType2(QualType T) { Type2 = T; } 2513 2514 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2515 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2516 2517 SourceLocation getRParenLoc() const { return RParenLoc; } 2518 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2519 2520 virtual SourceRange getSourceRange() const { 2521 return SourceRange(BuiltinLoc, RParenLoc); 2522 } 2523 static bool classof(const Stmt *T) { 2524 return T->getStmtClass() == TypesCompatibleExprClass; 2525 } 2526 static bool classof(const TypesCompatibleExpr *) { return true; } 2527 2528 // Iterators 2529 virtual child_iterator child_begin(); 2530 virtual child_iterator child_end(); 2531}; 2532 2533/// ShuffleVectorExpr - clang-specific builtin-in function 2534/// __builtin_shufflevector. 2535/// This AST node represents a operator that does a constant 2536/// shuffle, similar to LLVM's shufflevector instruction. It takes 2537/// two vectors and a variable number of constant indices, 2538/// and returns the appropriately shuffled vector. 2539class ShuffleVectorExpr : public Expr { 2540 SourceLocation BuiltinLoc, RParenLoc; 2541 2542 // SubExprs - the list of values passed to the __builtin_shufflevector 2543 // function. The first two are vectors, and the rest are constant 2544 // indices. The number of values in this list is always 2545 // 2+the number of indices in the vector type. 2546 Stmt **SubExprs; 2547 unsigned NumExprs; 2548 2549protected: 2550 virtual void DoDestroy(ASTContext &C); 2551 2552public: 2553 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2554 // to be computed differently? 2555 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2556 QualType Type, SourceLocation BLoc, 2557 SourceLocation RP) : 2558 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2559 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2560 2561 SubExprs = new (C) Stmt*[nexpr]; 2562 for (unsigned i = 0; i < nexpr; i++) 2563 SubExprs[i] = args[i]; 2564 } 2565 2566 /// \brief Build an empty vector-shuffle expression. 2567 explicit ShuffleVectorExpr(EmptyShell Empty) 2568 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2569 2570 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2571 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2572 2573 SourceLocation getRParenLoc() const { return RParenLoc; } 2574 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2575 2576 virtual SourceRange getSourceRange() const { 2577 return SourceRange(BuiltinLoc, RParenLoc); 2578 } 2579 static bool classof(const Stmt *T) { 2580 return T->getStmtClass() == ShuffleVectorExprClass; 2581 } 2582 static bool classof(const ShuffleVectorExpr *) { return true; } 2583 2584 ~ShuffleVectorExpr() {} 2585 2586 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2587 /// constant expression, the actual arguments passed in, and the function 2588 /// pointers. 2589 unsigned getNumSubExprs() const { return NumExprs; } 2590 2591 /// getExpr - Return the Expr at the specified index. 2592 Expr *getExpr(unsigned Index) { 2593 assert((Index < NumExprs) && "Arg access out of range!"); 2594 return cast<Expr>(SubExprs[Index]); 2595 } 2596 const Expr *getExpr(unsigned Index) const { 2597 assert((Index < NumExprs) && "Arg access out of range!"); 2598 return cast<Expr>(SubExprs[Index]); 2599 } 2600 2601 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2602 2603 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2604 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2605 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2606 } 2607 2608 // Iterators 2609 virtual child_iterator child_begin(); 2610 virtual child_iterator child_end(); 2611}; 2612 2613/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2614/// This AST node is similar to the conditional operator (?:) in C, with 2615/// the following exceptions: 2616/// - the test expression must be a integer constant expression. 2617/// - the expression returned acts like the chosen subexpression in every 2618/// visible way: the type is the same as that of the chosen subexpression, 2619/// and all predicates (whether it's an l-value, whether it's an integer 2620/// constant expression, etc.) return the same result as for the chosen 2621/// sub-expression. 2622class ChooseExpr : public Expr { 2623 enum { COND, LHS, RHS, END_EXPR }; 2624 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2625 SourceLocation BuiltinLoc, RParenLoc; 2626public: 2627 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2628 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2629 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2630 BuiltinLoc(BLoc), RParenLoc(RP) { 2631 SubExprs[COND] = cond; 2632 SubExprs[LHS] = lhs; 2633 SubExprs[RHS] = rhs; 2634 } 2635 2636 /// \brief Build an empty __builtin_choose_expr. 2637 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2638 2639 /// isConditionTrue - Return whether the condition is true (i.e. not 2640 /// equal to zero). 2641 bool isConditionTrue(ASTContext &C) const; 2642 2643 /// getChosenSubExpr - Return the subexpression chosen according to the 2644 /// condition. 2645 Expr *getChosenSubExpr(ASTContext &C) const { 2646 return isConditionTrue(C) ? getLHS() : getRHS(); 2647 } 2648 2649 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2650 void setCond(Expr *E) { SubExprs[COND] = E; } 2651 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2652 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2653 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2654 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2655 2656 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2657 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2658 2659 SourceLocation getRParenLoc() const { return RParenLoc; } 2660 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2661 2662 virtual SourceRange getSourceRange() const { 2663 return SourceRange(BuiltinLoc, RParenLoc); 2664 } 2665 static bool classof(const Stmt *T) { 2666 return T->getStmtClass() == ChooseExprClass; 2667 } 2668 static bool classof(const ChooseExpr *) { return true; } 2669 2670 // Iterators 2671 virtual child_iterator child_begin(); 2672 virtual child_iterator child_end(); 2673}; 2674 2675/// GNUNullExpr - Implements the GNU __null extension, which is a name 2676/// for a null pointer constant that has integral type (e.g., int or 2677/// long) and is the same size and alignment as a pointer. The __null 2678/// extension is typically only used by system headers, which define 2679/// NULL as __null in C++ rather than using 0 (which is an integer 2680/// that may not match the size of a pointer). 2681class GNUNullExpr : public Expr { 2682 /// TokenLoc - The location of the __null keyword. 2683 SourceLocation TokenLoc; 2684 2685public: 2686 GNUNullExpr(QualType Ty, SourceLocation Loc) 2687 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2688 2689 /// \brief Build an empty GNU __null expression. 2690 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2691 2692 /// getTokenLocation - The location of the __null token. 2693 SourceLocation getTokenLocation() const { return TokenLoc; } 2694 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2695 2696 virtual SourceRange getSourceRange() const { 2697 return SourceRange(TokenLoc); 2698 } 2699 static bool classof(const Stmt *T) { 2700 return T->getStmtClass() == GNUNullExprClass; 2701 } 2702 static bool classof(const GNUNullExpr *) { return true; } 2703 2704 // Iterators 2705 virtual child_iterator child_begin(); 2706 virtual child_iterator child_end(); 2707}; 2708 2709/// VAArgExpr, used for the builtin function __builtin_va_arg. 2710class VAArgExpr : public Expr { 2711 Stmt *Val; 2712 SourceLocation BuiltinLoc, RParenLoc; 2713public: 2714 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2715 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2716 Val(e), 2717 BuiltinLoc(BLoc), 2718 RParenLoc(RPLoc) { } 2719 2720 /// \brief Create an empty __builtin_va_arg expression. 2721 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2722 2723 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2724 Expr *getSubExpr() { return cast<Expr>(Val); } 2725 void setSubExpr(Expr *E) { Val = E; } 2726 2727 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2728 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2729 2730 SourceLocation getRParenLoc() const { return RParenLoc; } 2731 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2732 2733 virtual SourceRange getSourceRange() const { 2734 return SourceRange(BuiltinLoc, RParenLoc); 2735 } 2736 static bool classof(const Stmt *T) { 2737 return T->getStmtClass() == VAArgExprClass; 2738 } 2739 static bool classof(const VAArgExpr *) { return true; } 2740 2741 // Iterators 2742 virtual child_iterator child_begin(); 2743 virtual child_iterator child_end(); 2744}; 2745 2746/// @brief Describes an C or C++ initializer list. 2747/// 2748/// InitListExpr describes an initializer list, which can be used to 2749/// initialize objects of different types, including 2750/// struct/class/union types, arrays, and vectors. For example: 2751/// 2752/// @code 2753/// struct foo x = { 1, { 2, 3 } }; 2754/// @endcode 2755/// 2756/// Prior to semantic analysis, an initializer list will represent the 2757/// initializer list as written by the user, but will have the 2758/// placeholder type "void". This initializer list is called the 2759/// syntactic form of the initializer, and may contain C99 designated 2760/// initializers (represented as DesignatedInitExprs), initializations 2761/// of subobject members without explicit braces, and so on. Clients 2762/// interested in the original syntax of the initializer list should 2763/// use the syntactic form of the initializer list. 2764/// 2765/// After semantic analysis, the initializer list will represent the 2766/// semantic form of the initializer, where the initializations of all 2767/// subobjects are made explicit with nested InitListExpr nodes and 2768/// C99 designators have been eliminated by placing the designated 2769/// initializations into the subobject they initialize. Additionally, 2770/// any "holes" in the initialization, where no initializer has been 2771/// specified for a particular subobject, will be replaced with 2772/// implicitly-generated ImplicitValueInitExpr expressions that 2773/// value-initialize the subobjects. Note, however, that the 2774/// initializer lists may still have fewer initializers than there are 2775/// elements to initialize within the object. 2776/// 2777/// Given the semantic form of the initializer list, one can retrieve 2778/// the original syntactic form of that initializer list (if it 2779/// exists) using getSyntacticForm(). Since many initializer lists 2780/// have the same syntactic and semantic forms, getSyntacticForm() may 2781/// return NULL, indicating that the current initializer list also 2782/// serves as its syntactic form. 2783class InitListExpr : public Expr { 2784 // FIXME: Eliminate this vector in favor of ASTContext allocation 2785 typedef ASTVector<Stmt *> InitExprsTy; 2786 InitExprsTy InitExprs; 2787 SourceLocation LBraceLoc, RBraceLoc; 2788 2789 /// Contains the initializer list that describes the syntactic form 2790 /// written in the source code. 2791 InitListExpr *SyntacticForm; 2792 2793 /// If this initializer list initializes a union, specifies which 2794 /// field within the union will be initialized. 2795 FieldDecl *UnionFieldInit; 2796 2797 /// Whether this initializer list originally had a GNU array-range 2798 /// designator in it. This is a temporary marker used by CodeGen. 2799 bool HadArrayRangeDesignator; 2800 2801public: 2802 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2803 Expr **initexprs, unsigned numinits, 2804 SourceLocation rbraceloc); 2805 2806 /// \brief Build an empty initializer list. 2807 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2808 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2809 2810 unsigned getNumInits() const { return InitExprs.size(); } 2811 2812 const Expr* getInit(unsigned Init) const { 2813 assert(Init < getNumInits() && "Initializer access out of range!"); 2814 return cast_or_null<Expr>(InitExprs[Init]); 2815 } 2816 2817 Expr* getInit(unsigned Init) { 2818 assert(Init < getNumInits() && "Initializer access out of range!"); 2819 return cast_or_null<Expr>(InitExprs[Init]); 2820 } 2821 2822 void setInit(unsigned Init, Expr *expr) { 2823 assert(Init < getNumInits() && "Initializer access out of range!"); 2824 InitExprs[Init] = expr; 2825 } 2826 2827 /// \brief Reserve space for some number of initializers. 2828 void reserveInits(ASTContext &C, unsigned NumInits); 2829 2830 /// @brief Specify the number of initializers 2831 /// 2832 /// If there are more than @p NumInits initializers, the remaining 2833 /// initializers will be destroyed. If there are fewer than @p 2834 /// NumInits initializers, NULL expressions will be added for the 2835 /// unknown initializers. 2836 void resizeInits(ASTContext &Context, unsigned NumInits); 2837 2838 /// @brief Updates the initializer at index @p Init with the new 2839 /// expression @p expr, and returns the old expression at that 2840 /// location. 2841 /// 2842 /// When @p Init is out of range for this initializer list, the 2843 /// initializer list will be extended with NULL expressions to 2844 /// accomodate the new entry. 2845 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2846 2847 /// \brief If this initializes a union, specifies which field in the 2848 /// union to initialize. 2849 /// 2850 /// Typically, this field is the first named field within the 2851 /// union. However, a designated initializer can specify the 2852 /// initialization of a different field within the union. 2853 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2854 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2855 2856 // Explicit InitListExpr's originate from source code (and have valid source 2857 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2858 bool isExplicit() { 2859 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2860 } 2861 2862 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2863 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2864 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2865 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2866 2867 /// @brief Retrieve the initializer list that describes the 2868 /// syntactic form of the initializer. 2869 /// 2870 /// 2871 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2872 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2873 2874 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2875 void sawArrayRangeDesignator(bool ARD = true) { 2876 HadArrayRangeDesignator = ARD; 2877 } 2878 2879 virtual SourceRange getSourceRange() const { 2880 return SourceRange(LBraceLoc, RBraceLoc); 2881 } 2882 static bool classof(const Stmt *T) { 2883 return T->getStmtClass() == InitListExprClass; 2884 } 2885 static bool classof(const InitListExpr *) { return true; } 2886 2887 // Iterators 2888 virtual child_iterator child_begin(); 2889 virtual child_iterator child_end(); 2890 2891 typedef InitExprsTy::iterator iterator; 2892 typedef InitExprsTy::reverse_iterator reverse_iterator; 2893 2894 iterator begin() { return InitExprs.begin(); } 2895 iterator end() { return InitExprs.end(); } 2896 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2897 reverse_iterator rend() { return InitExprs.rend(); } 2898}; 2899 2900/// @brief Represents a C99 designated initializer expression. 2901/// 2902/// A designated initializer expression (C99 6.7.8) contains one or 2903/// more designators (which can be field designators, array 2904/// designators, or GNU array-range designators) followed by an 2905/// expression that initializes the field or element(s) that the 2906/// designators refer to. For example, given: 2907/// 2908/// @code 2909/// struct point { 2910/// double x; 2911/// double y; 2912/// }; 2913/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2914/// @endcode 2915/// 2916/// The InitListExpr contains three DesignatedInitExprs, the first of 2917/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2918/// designators, one array designator for @c [2] followed by one field 2919/// designator for @c .y. The initalization expression will be 1.0. 2920class DesignatedInitExpr : public Expr { 2921public: 2922 /// \brief Forward declaration of the Designator class. 2923 class Designator; 2924 2925private: 2926 /// The location of the '=' or ':' prior to the actual initializer 2927 /// expression. 2928 SourceLocation EqualOrColonLoc; 2929 2930 /// Whether this designated initializer used the GNU deprecated 2931 /// syntax rather than the C99 '=' syntax. 2932 bool GNUSyntax : 1; 2933 2934 /// The number of designators in this initializer expression. 2935 unsigned NumDesignators : 15; 2936 2937 /// \brief The designators in this designated initialization 2938 /// expression. 2939 Designator *Designators; 2940 2941 /// The number of subexpressions of this initializer expression, 2942 /// which contains both the initializer and any additional 2943 /// expressions used by array and array-range designators. 2944 unsigned NumSubExprs : 16; 2945 2946 2947 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2948 const Designator *Designators, 2949 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2950 Expr **IndexExprs, unsigned NumIndexExprs, 2951 Expr *Init); 2952 2953 explicit DesignatedInitExpr(unsigned NumSubExprs) 2954 : Expr(DesignatedInitExprClass, EmptyShell()), 2955 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2956 2957protected: 2958 virtual void DoDestroy(ASTContext &C); 2959 2960 void DestroyDesignators(ASTContext &C); 2961 2962public: 2963 /// A field designator, e.g., ".x". 2964 struct FieldDesignator { 2965 /// Refers to the field that is being initialized. The low bit 2966 /// of this field determines whether this is actually a pointer 2967 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2968 /// initially constructed, a field designator will store an 2969 /// IdentifierInfo*. After semantic analysis has resolved that 2970 /// name, the field designator will instead store a FieldDecl*. 2971 uintptr_t NameOrField; 2972 2973 /// The location of the '.' in the designated initializer. 2974 unsigned DotLoc; 2975 2976 /// The location of the field name in the designated initializer. 2977 unsigned FieldLoc; 2978 }; 2979 2980 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2981 struct ArrayOrRangeDesignator { 2982 /// Location of the first index expression within the designated 2983 /// initializer expression's list of subexpressions. 2984 unsigned Index; 2985 /// The location of the '[' starting the array range designator. 2986 unsigned LBracketLoc; 2987 /// The location of the ellipsis separating the start and end 2988 /// indices. Only valid for GNU array-range designators. 2989 unsigned EllipsisLoc; 2990 /// The location of the ']' terminating the array range designator. 2991 unsigned RBracketLoc; 2992 }; 2993 2994 /// @brief Represents a single C99 designator. 2995 /// 2996 /// @todo This class is infuriatingly similar to clang::Designator, 2997 /// but minor differences (storing indices vs. storing pointers) 2998 /// keep us from reusing it. Try harder, later, to rectify these 2999 /// differences. 3000 class Designator { 3001 /// @brief The kind of designator this describes. 3002 enum { 3003 FieldDesignator, 3004 ArrayDesignator, 3005 ArrayRangeDesignator 3006 } Kind; 3007 3008 union { 3009 /// A field designator, e.g., ".x". 3010 struct FieldDesignator Field; 3011 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3012 struct ArrayOrRangeDesignator ArrayOrRange; 3013 }; 3014 friend class DesignatedInitExpr; 3015 3016 public: 3017 Designator() {} 3018 3019 /// @brief Initializes a field designator. 3020 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3021 SourceLocation FieldLoc) 3022 : Kind(FieldDesignator) { 3023 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3024 Field.DotLoc = DotLoc.getRawEncoding(); 3025 Field.FieldLoc = FieldLoc.getRawEncoding(); 3026 } 3027 3028 /// @brief Initializes an array designator. 3029 Designator(unsigned Index, SourceLocation LBracketLoc, 3030 SourceLocation RBracketLoc) 3031 : Kind(ArrayDesignator) { 3032 ArrayOrRange.Index = Index; 3033 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3034 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3035 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3036 } 3037 3038 /// @brief Initializes a GNU array-range designator. 3039 Designator(unsigned Index, SourceLocation LBracketLoc, 3040 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3041 : Kind(ArrayRangeDesignator) { 3042 ArrayOrRange.Index = Index; 3043 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3044 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3045 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3046 } 3047 3048 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3049 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3050 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3051 3052 IdentifierInfo * getFieldName(); 3053 3054 FieldDecl *getField() { 3055 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3056 if (Field.NameOrField & 0x01) 3057 return 0; 3058 else 3059 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3060 } 3061 3062 void setField(FieldDecl *FD) { 3063 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3064 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3065 } 3066 3067 SourceLocation getDotLoc() const { 3068 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3069 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3070 } 3071 3072 SourceLocation getFieldLoc() const { 3073 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3074 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3075 } 3076 3077 SourceLocation getLBracketLoc() const { 3078 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3079 "Only valid on an array or array-range designator"); 3080 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3081 } 3082 3083 SourceLocation getRBracketLoc() const { 3084 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3085 "Only valid on an array or array-range designator"); 3086 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3087 } 3088 3089 SourceLocation getEllipsisLoc() const { 3090 assert(Kind == ArrayRangeDesignator && 3091 "Only valid on an array-range designator"); 3092 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3093 } 3094 3095 unsigned getFirstExprIndex() const { 3096 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3097 "Only valid on an array or array-range designator"); 3098 return ArrayOrRange.Index; 3099 } 3100 3101 SourceLocation getStartLocation() const { 3102 if (Kind == FieldDesignator) 3103 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3104 else 3105 return getLBracketLoc(); 3106 } 3107 }; 3108 3109 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3110 unsigned NumDesignators, 3111 Expr **IndexExprs, unsigned NumIndexExprs, 3112 SourceLocation EqualOrColonLoc, 3113 bool GNUSyntax, Expr *Init); 3114 3115 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3116 3117 /// @brief Returns the number of designators in this initializer. 3118 unsigned size() const { return NumDesignators; } 3119 3120 // Iterator access to the designators. 3121 typedef Designator* designators_iterator; 3122 designators_iterator designators_begin() { return Designators; } 3123 designators_iterator designators_end() { 3124 return Designators + NumDesignators; 3125 } 3126 3127 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3128 3129 void setDesignators(ASTContext &C, const Designator *Desigs, 3130 unsigned NumDesigs); 3131 3132 Expr *getArrayIndex(const Designator& D); 3133 Expr *getArrayRangeStart(const Designator& D); 3134 Expr *getArrayRangeEnd(const Designator& D); 3135 3136 /// @brief Retrieve the location of the '=' that precedes the 3137 /// initializer value itself, if present. 3138 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3139 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3140 3141 /// @brief Determines whether this designated initializer used the 3142 /// deprecated GNU syntax for designated initializers. 3143 bool usesGNUSyntax() const { return GNUSyntax; } 3144 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3145 3146 /// @brief Retrieve the initializer value. 3147 Expr *getInit() const { 3148 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3149 } 3150 3151 void setInit(Expr *init) { 3152 *child_begin() = init; 3153 } 3154 3155 /// \brief Retrieve the total number of subexpressions in this 3156 /// designated initializer expression, including the actual 3157 /// initialized value and any expressions that occur within array 3158 /// and array-range designators. 3159 unsigned getNumSubExprs() const { return NumSubExprs; } 3160 3161 Expr *getSubExpr(unsigned Idx) { 3162 assert(Idx < NumSubExprs && "Subscript out of range"); 3163 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3164 Ptr += sizeof(DesignatedInitExpr); 3165 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3166 } 3167 3168 void setSubExpr(unsigned Idx, Expr *E) { 3169 assert(Idx < NumSubExprs && "Subscript out of range"); 3170 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3171 Ptr += sizeof(DesignatedInitExpr); 3172 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3173 } 3174 3175 /// \brief Replaces the designator at index @p Idx with the series 3176 /// of designators in [First, Last). 3177 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3178 const Designator *Last); 3179 3180 virtual SourceRange getSourceRange() const; 3181 3182 static bool classof(const Stmt *T) { 3183 return T->getStmtClass() == DesignatedInitExprClass; 3184 } 3185 static bool classof(const DesignatedInitExpr *) { return true; } 3186 3187 // Iterators 3188 virtual child_iterator child_begin(); 3189 virtual child_iterator child_end(); 3190}; 3191 3192/// \brief Represents an implicitly-generated value initialization of 3193/// an object of a given type. 3194/// 3195/// Implicit value initializations occur within semantic initializer 3196/// list expressions (InitListExpr) as placeholders for subobject 3197/// initializations not explicitly specified by the user. 3198/// 3199/// \see InitListExpr 3200class ImplicitValueInitExpr : public Expr { 3201public: 3202 explicit ImplicitValueInitExpr(QualType ty) 3203 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3204 3205 /// \brief Construct an empty implicit value initialization. 3206 explicit ImplicitValueInitExpr(EmptyShell Empty) 3207 : Expr(ImplicitValueInitExprClass, Empty) { } 3208 3209 static bool classof(const Stmt *T) { 3210 return T->getStmtClass() == ImplicitValueInitExprClass; 3211 } 3212 static bool classof(const ImplicitValueInitExpr *) { return true; } 3213 3214 virtual SourceRange getSourceRange() const { 3215 return SourceRange(); 3216 } 3217 3218 // Iterators 3219 virtual child_iterator child_begin(); 3220 virtual child_iterator child_end(); 3221}; 3222 3223 3224class ParenListExpr : public Expr { 3225 Stmt **Exprs; 3226 unsigned NumExprs; 3227 SourceLocation LParenLoc, RParenLoc; 3228 3229protected: 3230 virtual void DoDestroy(ASTContext& C); 3231 3232public: 3233 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3234 unsigned numexprs, SourceLocation rparenloc); 3235 3236 ~ParenListExpr() {} 3237 3238 /// \brief Build an empty paren list. 3239 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3240 3241 unsigned getNumExprs() const { return NumExprs; } 3242 3243 const Expr* getExpr(unsigned Init) const { 3244 assert(Init < getNumExprs() && "Initializer access out of range!"); 3245 return cast_or_null<Expr>(Exprs[Init]); 3246 } 3247 3248 Expr* getExpr(unsigned Init) { 3249 assert(Init < getNumExprs() && "Initializer access out of range!"); 3250 return cast_or_null<Expr>(Exprs[Init]); 3251 } 3252 3253 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3254 3255 SourceLocation getLParenLoc() const { return LParenLoc; } 3256 SourceLocation getRParenLoc() const { return RParenLoc; } 3257 3258 virtual SourceRange getSourceRange() const { 3259 return SourceRange(LParenLoc, RParenLoc); 3260 } 3261 static bool classof(const Stmt *T) { 3262 return T->getStmtClass() == ParenListExprClass; 3263 } 3264 static bool classof(const ParenListExpr *) { return true; } 3265 3266 // Iterators 3267 virtual child_iterator child_begin(); 3268 virtual child_iterator child_end(); 3269 3270 friend class PCHStmtReader; 3271 friend class PCHStmtWriter; 3272}; 3273 3274 3275//===----------------------------------------------------------------------===// 3276// Clang Extensions 3277//===----------------------------------------------------------------------===// 3278 3279 3280/// ExtVectorElementExpr - This represents access to specific elements of a 3281/// vector, and may occur on the left hand side or right hand side. For example 3282/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3283/// 3284/// Note that the base may have either vector or pointer to vector type, just 3285/// like a struct field reference. 3286/// 3287class ExtVectorElementExpr : public Expr { 3288 Stmt *Base; 3289 IdentifierInfo *Accessor; 3290 SourceLocation AccessorLoc; 3291public: 3292 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3293 SourceLocation loc) 3294 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3295 base->isValueDependent()), 3296 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3297 3298 /// \brief Build an empty vector element expression. 3299 explicit ExtVectorElementExpr(EmptyShell Empty) 3300 : Expr(ExtVectorElementExprClass, Empty) { } 3301 3302 const Expr *getBase() const { return cast<Expr>(Base); } 3303 Expr *getBase() { return cast<Expr>(Base); } 3304 void setBase(Expr *E) { Base = E; } 3305 3306 IdentifierInfo &getAccessor() const { return *Accessor; } 3307 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3308 3309 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3310 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3311 3312 /// getNumElements - Get the number of components being selected. 3313 unsigned getNumElements() const; 3314 3315 /// containsDuplicateElements - Return true if any element access is 3316 /// repeated. 3317 bool containsDuplicateElements() const; 3318 3319 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3320 /// aggregate Constant of ConstantInt(s). 3321 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3322 3323 virtual SourceRange getSourceRange() const { 3324 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3325 } 3326 3327 /// isArrow - Return true if the base expression is a pointer to vector, 3328 /// return false if the base expression is a vector. 3329 bool isArrow() const; 3330 3331 static bool classof(const Stmt *T) { 3332 return T->getStmtClass() == ExtVectorElementExprClass; 3333 } 3334 static bool classof(const ExtVectorElementExpr *) { return true; } 3335 3336 // Iterators 3337 virtual child_iterator child_begin(); 3338 virtual child_iterator child_end(); 3339}; 3340 3341 3342/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3343/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3344class BlockExpr : public Expr { 3345protected: 3346 BlockDecl *TheBlock; 3347 bool HasBlockDeclRefExprs; 3348public: 3349 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3350 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3351 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3352 3353 /// \brief Build an empty block expression. 3354 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3355 3356 const BlockDecl *getBlockDecl() const { return TheBlock; } 3357 BlockDecl *getBlockDecl() { return TheBlock; } 3358 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3359 3360 // Convenience functions for probing the underlying BlockDecl. 3361 SourceLocation getCaretLocation() const; 3362 const Stmt *getBody() const; 3363 Stmt *getBody(); 3364 3365 virtual SourceRange getSourceRange() const { 3366 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3367 } 3368 3369 /// getFunctionType - Return the underlying function type for this block. 3370 const FunctionType *getFunctionType() const; 3371 3372 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3373 /// inside of the block that reference values outside the block. 3374 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3375 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3376 3377 static bool classof(const Stmt *T) { 3378 return T->getStmtClass() == BlockExprClass; 3379 } 3380 static bool classof(const BlockExpr *) { return true; } 3381 3382 // Iterators 3383 virtual child_iterator child_begin(); 3384 virtual child_iterator child_end(); 3385}; 3386 3387/// BlockDeclRefExpr - A reference to a declared variable, function, 3388/// enum, etc. 3389class BlockDeclRefExpr : public Expr { 3390 ValueDecl *D; 3391 SourceLocation Loc; 3392 bool IsByRef : 1; 3393 bool ConstQualAdded : 1; 3394 Stmt *CopyConstructorVal; 3395public: 3396 // FIXME: Fix type/value dependence! 3397 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3398 bool constAdded = false, 3399 Stmt *copyConstructorVal = 0) 3400 : Expr(BlockDeclRefExprClass, t, false, false), D(d), Loc(l), IsByRef(ByRef), 3401 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3402 3403 // \brief Build an empty reference to a declared variable in a 3404 // block. 3405 explicit BlockDeclRefExpr(EmptyShell Empty) 3406 : Expr(BlockDeclRefExprClass, Empty) { } 3407 3408 ValueDecl *getDecl() { return D; } 3409 const ValueDecl *getDecl() const { return D; } 3410 void setDecl(ValueDecl *VD) { D = VD; } 3411 3412 SourceLocation getLocation() const { return Loc; } 3413 void setLocation(SourceLocation L) { Loc = L; } 3414 3415 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3416 3417 bool isByRef() const { return IsByRef; } 3418 void setByRef(bool BR) { IsByRef = BR; } 3419 3420 bool isConstQualAdded() const { return ConstQualAdded; } 3421 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3422 3423 const Expr *getCopyConstructorExpr() const 3424 { return cast_or_null<Expr>(CopyConstructorVal); } 3425 Expr *getCopyConstructorExpr() 3426 { return cast_or_null<Expr>(CopyConstructorVal); } 3427 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3428 3429 static bool classof(const Stmt *T) { 3430 return T->getStmtClass() == BlockDeclRefExprClass; 3431 } 3432 static bool classof(const BlockDeclRefExpr *) { return true; } 3433 3434 // Iterators 3435 virtual child_iterator child_begin(); 3436 virtual child_iterator child_end(); 3437}; 3438 3439} // end namespace clang 3440 3441#endif 3442