Expr.h revision 0979c805475d1ba49b5d6ef93c4d2ce6d2eab6ed
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 "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 class CXXAdornedMemberExpr; 37 38/// Expr - This represents one expression. Note that Expr's are subclasses of 39/// Stmt. This allows an expression to be transparently used any place a Stmt 40/// is required. 41/// 42class Expr : public Stmt { 43 QualType TR; 44 45protected: 46 /// TypeDependent - Whether this expression is type-dependent 47 /// (C++ [temp.dep.expr]). 48 bool TypeDependent : 1; 49 50 /// ValueDependent - Whether this expression is value-dependent 51 /// (C++ [temp.dep.constexpr]). 52 bool ValueDependent : 1; 53 54 // FIXME: Eventually, this constructor should go away and we should 55 // require every subclass to provide type/value-dependence 56 // information. 57 Expr(StmtClass SC, QualType T) 58 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 59 setType(T); 60 } 61 62 Expr(StmtClass SC, QualType T, bool TD, bool VD) 63 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 64 setType(T); 65 } 66 67 /// \brief Construct an empty expression. 68 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 69 70public: 71 /// \brief Increases the reference count for this expression. 72 /// 73 /// Invoke the Retain() operation when this expression 74 /// is being shared by another owner. 75 Expr *Retain() { 76 Stmt::Retain(); 77 return this; 78 } 79 80 QualType getType() const { return TR; } 81 void setType(QualType t) { 82 // In C++, the type of an expression is always adjusted so that it 83 // will not have reference type an expression will never have 84 // reference type (C++ [expr]p6). Use 85 // QualType::getNonReferenceType() to retrieve the non-reference 86 // type. Additionally, inspect Expr::isLvalue to determine whether 87 // an expression that is adjusted in this manner should be 88 // considered an lvalue. 89 assert((TR.isNull() || !TR->isReferenceType()) && 90 "Expressions can't have reference type"); 91 92 TR = t; 93 } 94 95 /// isValueDependent - Determines whether this expression is 96 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 97 /// array bound of "Chars" in the following example is 98 /// value-dependent. 99 /// @code 100 /// template<int Size, char (&Chars)[Size]> struct meta_string; 101 /// @endcode 102 bool isValueDependent() const { return ValueDependent; } 103 104 /// \brief Set whether this expression is value-dependent or not. 105 void setValueDependent(bool VD) { ValueDependent = VD; } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { TypeDependent = TD; } 122 123 /// SourceLocation tokens are not useful in isolation - they are low level 124 /// value objects created/interpreted by SourceManager. We assume AST 125 /// clients will have a pointer to the respective SourceManager. 126 virtual SourceRange getSourceRange() const = 0; 127 128 /// getExprLoc - Return the preferred location for the arrow when diagnosing 129 /// a problem with a generic expression. 130 virtual SourceLocation getExprLoc() const { return getLocStart(); } 131 132 /// isUnusedResultAWarning - Return true if this immediate expression should 133 /// be warned about if the result is unused. If so, fill in Loc and Ranges 134 /// with location to warn on and the source range[s] to report with the 135 /// warning. 136 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 137 SourceRange &R2) const; 138 139 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 140 /// incomplete type other than void. Nonarray expressions that can be lvalues: 141 /// - name, where name must be a variable 142 /// - e[i] 143 /// - (e), where e must be an lvalue 144 /// - e.name, where e must be an lvalue 145 /// - e->name 146 /// - *e, the type of e cannot be a function type 147 /// - string-constant 148 /// - reference type [C++ [expr]] 149 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 150 /// 151 enum isLvalueResult { 152 LV_Valid, 153 LV_NotObjectType, 154 LV_IncompleteVoidType, 155 LV_DuplicateVectorComponents, 156 LV_InvalidExpression, 157 LV_MemberFunction 158 }; 159 isLvalueResult isLvalue(ASTContext &Ctx) const; 160 161 // Same as above, but excluding checks for non-object and void types in C 162 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 163 164 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 165 /// does not have an incomplete type, does not have a const-qualified type, 166 /// and if it is a structure or union, does not have any member (including, 167 /// recursively, any member or element of all contained aggregates or unions) 168 /// with a const-qualified type. 169 /// 170 /// \param Loc [in] [out] - A source location which *may* be filled 171 /// in with the location of the expression making this a 172 /// non-modifiable lvalue, if specified. 173 enum isModifiableLvalueResult { 174 MLV_Valid, 175 MLV_NotObjectType, 176 MLV_IncompleteVoidType, 177 MLV_DuplicateVectorComponents, 178 MLV_InvalidExpression, 179 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 180 MLV_IncompleteType, 181 MLV_ConstQualified, 182 MLV_ArrayType, 183 MLV_NotBlockQualified, 184 MLV_ReadonlyProperty, 185 MLV_NoSetterProperty, 186 MLV_MemberFunction 187 }; 188 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 189 SourceLocation *Loc = 0) const; 190 191 /// \brief If this expression refers to a bit-field, retrieve the 192 /// declaration of that bit-field. 193 FieldDecl *getBitField(); 194 195 const FieldDecl *getBitField() const { 196 return const_cast<Expr*>(this)->getBitField(); 197 } 198 199 /// isIntegerConstantExpr - Return true if this expression is a valid integer 200 /// constant expression, and, if so, return its value in Result. If not a 201 /// valid i-c-e, return false and fill in Loc (if specified) with the location 202 /// of the invalid expression. 203 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 204 SourceLocation *Loc = 0, 205 bool isEvaluated = true) const; 206 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 207 llvm::APSInt X; 208 return isIntegerConstantExpr(X, Ctx, Loc); 209 } 210 /// isConstantInitializer - Returns true if this expression is a constant 211 /// initializer, which can be emitted at compile-time. 212 bool isConstantInitializer(ASTContext &Ctx) const; 213 214 /// EvalResult is a struct with detailed info about an evaluated expression. 215 struct EvalResult { 216 /// Val - This is the value the expression can be folded to. 217 APValue Val; 218 219 /// HasSideEffects - Whether the evaluated expression has side effects. 220 /// For example, (f() && 0) can be folded, but it still has side effects. 221 bool HasSideEffects; 222 223 /// Diag - If the expression is unfoldable, then Diag contains a note 224 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 225 /// position for the error, and DiagExpr is the expression that caused 226 /// the error. 227 /// If the expression is foldable, but not an integer constant expression, 228 /// Diag contains a note diagnostic that describes why it isn't an integer 229 /// constant expression. If the expression *is* an integer constant 230 /// expression, then Diag will be zero. 231 unsigned Diag; 232 const Expr *DiagExpr; 233 SourceLocation DiagLoc; 234 235 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 236 }; 237 238 /// Evaluate - Return true if this is a constant which we can fold using 239 /// any crazy technique (that has nothing to do with language standards) that 240 /// we want to. If this function returns true, it returns the folded constant 241 /// in Result. 242 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 243 244 /// isEvaluatable - Call Evaluate to see if this expression can be constant 245 /// folded, but discard the result. 246 bool isEvaluatable(ASTContext &Ctx) const; 247 248 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 249 /// must be called on an expression that constant folds to an integer. 250 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 251 252 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 253 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 254 255 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 256 /// integer constant expression with the value zero, or if this is one that is 257 /// cast to void*. 258 bool isNullPointerConstant(ASTContext &Ctx) const; 259 260 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 261 /// write barrier. 262 bool isOBJCGCCandidate(ASTContext &Ctx) const; 263 264 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 265 /// its subexpression. If that subexpression is also a ParenExpr, 266 /// then this method recursively returns its subexpression, and so forth. 267 /// Otherwise, the method returns the current Expr. 268 Expr* IgnoreParens(); 269 270 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 271 /// or CastExprs, returning their operand. 272 Expr *IgnoreParenCasts(); 273 274 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 275 /// value (including ptr->int casts of the same size). Strip off any 276 /// ParenExpr or CastExprs, returning their operand. 277 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 278 279 const Expr* IgnoreParens() const { 280 return const_cast<Expr*>(this)->IgnoreParens(); 281 } 282 const Expr *IgnoreParenCasts() const { 283 return const_cast<Expr*>(this)->IgnoreParenCasts(); 284 } 285 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 286 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 287 } 288 289 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 290 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 291 292 static bool classof(const Stmt *T) { 293 return T->getStmtClass() >= firstExprConstant && 294 T->getStmtClass() <= lastExprConstant; 295 } 296 static bool classof(const Expr *) { return true; } 297}; 298 299 300//===----------------------------------------------------------------------===// 301// Primary Expressions. 302//===----------------------------------------------------------------------===// 303 304/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 305/// enum, etc. 306class DeclRefExpr : public Expr { 307 NamedDecl *D; 308 SourceLocation Loc; 309 310protected: 311 // FIXME: Eventually, this constructor will go away and all subclasses 312 // will have to provide the type- and value-dependent flags. 313 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 314 Expr(SC, t), D(d), Loc(l) {} 315 316 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 317 bool VD) : 318 Expr(SC, t, TD, VD), D(d), Loc(l) {} 319 320public: 321 // FIXME: Eventually, this constructor will go away and all clients 322 // will have to provide the type- and value-dependent flags. 323 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 324 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 325 326 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 327 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 328 329 /// \brief Construct an empty declaration reference expression. 330 explicit DeclRefExpr(EmptyShell Empty) 331 : Expr(DeclRefExprClass, Empty) { } 332 333 NamedDecl *getDecl() { return D; } 334 const NamedDecl *getDecl() const { return D; } 335 void setDecl(NamedDecl *NewD) { D = NewD; } 336 337 SourceLocation getLocation() const { return Loc; } 338 void setLocation(SourceLocation L) { Loc = L; } 339 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 340 341 static bool classof(const Stmt *T) { 342 return T->getStmtClass() == DeclRefExprClass || 343 T->getStmtClass() == CXXConditionDeclExprClass || 344 T->getStmtClass() == QualifiedDeclRefExprClass; 345 } 346 static bool classof(const DeclRefExpr *) { return true; } 347 348 // Iterators 349 virtual child_iterator child_begin(); 350 virtual child_iterator child_end(); 351}; 352 353/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 354class PredefinedExpr : public Expr { 355public: 356 enum IdentType { 357 Func, 358 Function, 359 PrettyFunction 360 }; 361 362private: 363 SourceLocation Loc; 364 IdentType Type; 365public: 366 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 367 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 368 369 /// \brief Construct an empty predefined expression. 370 explicit PredefinedExpr(EmptyShell Empty) 371 : Expr(PredefinedExprClass, Empty) { } 372 373 IdentType getIdentType() const { return Type; } 374 void setIdentType(IdentType IT) { Type = IT; } 375 376 SourceLocation getLocation() const { return Loc; } 377 void setLocation(SourceLocation L) { Loc = L; } 378 379 // FIXME: The logic for computing the value of a predefined expr should go 380 // into a method here that takes the inner-most code decl (a block, function 381 // or objc method) that the expr lives in. This would allow sema and codegen 382 // to be consistent for things like sizeof(__func__) etc. 383 384 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 385 386 static bool classof(const Stmt *T) { 387 return T->getStmtClass() == PredefinedExprClass; 388 } 389 static bool classof(const PredefinedExpr *) { return true; } 390 391 // Iterators 392 virtual child_iterator child_begin(); 393 virtual child_iterator child_end(); 394}; 395 396class IntegerLiteral : public Expr { 397 llvm::APInt Value; 398 SourceLocation Loc; 399public: 400 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 401 // or UnsignedLongLongTy 402 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 403 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 404 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 405 } 406 407 /// \brief Construct an empty integer literal. 408 explicit IntegerLiteral(EmptyShell Empty) 409 : Expr(IntegerLiteralClass, Empty) { } 410 411 const llvm::APInt &getValue() const { return Value; } 412 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 413 414 /// \brief Retrieve the location of the literal. 415 SourceLocation getLocation() const { return Loc; } 416 417 void setValue(const llvm::APInt &Val) { Value = Val; } 418 void setLocation(SourceLocation Location) { Loc = Location; } 419 420 static bool classof(const Stmt *T) { 421 return T->getStmtClass() == IntegerLiteralClass; 422 } 423 static bool classof(const IntegerLiteral *) { return true; } 424 425 // Iterators 426 virtual child_iterator child_begin(); 427 virtual child_iterator child_end(); 428}; 429 430class CharacterLiteral : public Expr { 431 unsigned Value; 432 SourceLocation Loc; 433 bool IsWide; 434public: 435 // type should be IntTy 436 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 437 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 438 } 439 440 /// \brief Construct an empty character literal. 441 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 442 443 SourceLocation getLocation() const { return Loc; } 444 bool isWide() const { return IsWide; } 445 446 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 447 448 unsigned getValue() const { return Value; } 449 450 void setLocation(SourceLocation Location) { Loc = Location; } 451 void setWide(bool W) { IsWide = W; } 452 void setValue(unsigned Val) { Value = Val; } 453 454 static bool classof(const Stmt *T) { 455 return T->getStmtClass() == CharacterLiteralClass; 456 } 457 static bool classof(const CharacterLiteral *) { return true; } 458 459 // Iterators 460 virtual child_iterator child_begin(); 461 virtual child_iterator child_end(); 462}; 463 464class FloatingLiteral : public Expr { 465 llvm::APFloat Value; 466 bool IsExact : 1; 467 SourceLocation Loc; 468public: 469 FloatingLiteral(const llvm::APFloat &V, bool isexact, 470 QualType Type, SourceLocation L) 471 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 472 473 /// \brief Construct an empty floating-point literal. 474 explicit FloatingLiteral(EmptyShell Empty) 475 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 476 477 const llvm::APFloat &getValue() const { return Value; } 478 void setValue(const llvm::APFloat &Val) { Value = Val; } 479 480 bool isExact() const { return IsExact; } 481 void setExact(bool E) { IsExact = E; } 482 483 /// getValueAsApproximateDouble - This returns the value as an inaccurate 484 /// double. Note that this may cause loss of precision, but is useful for 485 /// debugging dumps, etc. 486 double getValueAsApproximateDouble() const; 487 488 SourceLocation getLocation() const { return Loc; } 489 void setLocation(SourceLocation L) { Loc = L; } 490 491 // FIXME: The logic for computing the value of a predefined expr should go 492 // into a method here that takes the inner-most code decl (a block, function 493 // or objc method) that the expr lives in. This would allow sema and codegen 494 // to be consistent for things like sizeof(__func__) etc. 495 496 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 497 498 static bool classof(const Stmt *T) { 499 return T->getStmtClass() == FloatingLiteralClass; 500 } 501 static bool classof(const FloatingLiteral *) { return true; } 502 503 // Iterators 504 virtual child_iterator child_begin(); 505 virtual child_iterator child_end(); 506}; 507 508/// ImaginaryLiteral - We support imaginary integer and floating point literals, 509/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 510/// IntegerLiteral classes. Instances of this class always have a Complex type 511/// whose element type matches the subexpression. 512/// 513class ImaginaryLiteral : public Expr { 514 Stmt *Val; 515public: 516 ImaginaryLiteral(Expr *val, QualType Ty) 517 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 518 519 /// \brief Build an empty imaginary literal. 520 explicit ImaginaryLiteral(EmptyShell Empty) 521 : Expr(ImaginaryLiteralClass, Empty) { } 522 523 const Expr *getSubExpr() const { return cast<Expr>(Val); } 524 Expr *getSubExpr() { return cast<Expr>(Val); } 525 void setSubExpr(Expr *E) { Val = E; } 526 527 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 528 static bool classof(const Stmt *T) { 529 return T->getStmtClass() == ImaginaryLiteralClass; 530 } 531 static bool classof(const ImaginaryLiteral *) { return true; } 532 533 // Iterators 534 virtual child_iterator child_begin(); 535 virtual child_iterator child_end(); 536}; 537 538/// StringLiteral - This represents a string literal expression, e.g. "foo" 539/// or L"bar" (wide strings). The actual string is returned by getStrData() 540/// is NOT null-terminated, and the length of the string is determined by 541/// calling getByteLength(). The C type for a string is always a 542/// ConstantArrayType. In C++, the char type is const qualified, in C it is 543/// not. 544/// 545/// Note that strings in C can be formed by concatenation of multiple string 546/// literal pptokens in translation phase #6. This keeps track of the locations 547/// of each of these pieces. 548/// 549/// Strings in C can also be truncated and extended by assigning into arrays, 550/// e.g. with constructs like: 551/// char X[2] = "foobar"; 552/// In this case, getByteLength() will return 6, but the string literal will 553/// have type "char[2]". 554class StringLiteral : public Expr { 555 const char *StrData; 556 unsigned ByteLength; 557 bool IsWide; 558 unsigned NumConcatenated; 559 SourceLocation TokLocs[1]; 560 561 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 562 563protected: 564 virtual void DoDestroy(ASTContext &C); 565 566public: 567 /// This is the "fully general" constructor that allows representation of 568 /// strings formed from multiple concatenated tokens. 569 static StringLiteral *Create(ASTContext &C, const char *StrData, 570 unsigned ByteLength, bool Wide, QualType Ty, 571 const SourceLocation *Loc, unsigned NumStrs); 572 573 /// Simple constructor for string literals made from one token. 574 static StringLiteral *Create(ASTContext &C, const char *StrData, 575 unsigned ByteLength, 576 bool Wide, QualType Ty, SourceLocation Loc) { 577 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 578 } 579 580 /// \brief Construct an empty string literal. 581 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 582 583 const char *getStrData() const { return StrData; } 584 unsigned getByteLength() const { return ByteLength; } 585 586 /// \brief Sets the string data to the given string data. 587 void setStrData(ASTContext &C, const char *Str, unsigned Len); 588 589 bool isWide() const { return IsWide; } 590 void setWide(bool W) { IsWide = W; } 591 592 bool containsNonAsciiOrNull() const { 593 for (unsigned i = 0; i < getByteLength(); ++i) 594 if (!isascii(getStrData()[i]) || !getStrData()[i]) 595 return true; 596 return false; 597 } 598 /// getNumConcatenated - Get the number of string literal tokens that were 599 /// concatenated in translation phase #6 to form this string literal. 600 unsigned getNumConcatenated() const { return NumConcatenated; } 601 602 SourceLocation getStrTokenLoc(unsigned TokNum) const { 603 assert(TokNum < NumConcatenated && "Invalid tok number"); 604 return TokLocs[TokNum]; 605 } 606 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 607 assert(TokNum < NumConcatenated && "Invalid tok number"); 608 TokLocs[TokNum] = L; 609 } 610 611 typedef const SourceLocation *tokloc_iterator; 612 tokloc_iterator tokloc_begin() const { return TokLocs; } 613 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 614 615 virtual SourceRange getSourceRange() const { 616 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 617 } 618 static bool classof(const Stmt *T) { 619 return T->getStmtClass() == StringLiteralClass; 620 } 621 static bool classof(const StringLiteral *) { return true; } 622 623 // Iterators 624 virtual child_iterator child_begin(); 625 virtual child_iterator child_end(); 626}; 627 628/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 629/// AST node is only formed if full location information is requested. 630class ParenExpr : public Expr { 631 SourceLocation L, R; 632 Stmt *Val; 633public: 634 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 635 : Expr(ParenExprClass, val->getType(), 636 val->isTypeDependent(), val->isValueDependent()), 637 L(l), R(r), Val(val) {} 638 639 /// \brief Construct an empty parenthesized expression. 640 explicit ParenExpr(EmptyShell Empty) 641 : Expr(ParenExprClass, Empty) { } 642 643 const Expr *getSubExpr() const { return cast<Expr>(Val); } 644 Expr *getSubExpr() { return cast<Expr>(Val); } 645 void setSubExpr(Expr *E) { Val = E; } 646 647 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 648 649 /// \brief Get the location of the left parentheses '('. 650 SourceLocation getLParen() const { return L; } 651 void setLParen(SourceLocation Loc) { L = Loc; } 652 653 /// \brief Get the location of the right parentheses ')'. 654 SourceLocation getRParen() const { return R; } 655 void setRParen(SourceLocation Loc) { R = Loc; } 656 657 static bool classof(const Stmt *T) { 658 return T->getStmtClass() == ParenExprClass; 659 } 660 static bool classof(const ParenExpr *) { return true; } 661 662 // Iterators 663 virtual child_iterator child_begin(); 664 virtual child_iterator child_end(); 665}; 666 667 668/// UnaryOperator - This represents the unary-expression's (except sizeof and 669/// alignof), the postinc/postdec operators from postfix-expression, and various 670/// extensions. 671/// 672/// Notes on various nodes: 673/// 674/// Real/Imag - These return the real/imag part of a complex operand. If 675/// applied to a non-complex value, the former returns its operand and the 676/// later returns zero in the type of the operand. 677/// 678/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 679/// subexpression is a compound literal with the various MemberExpr and 680/// ArraySubscriptExpr's applied to it. 681/// 682class UnaryOperator : public Expr { 683public: 684 // Note that additions to this should also update the StmtVisitor class. 685 enum Opcode { 686 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 687 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 688 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 689 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 690 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 691 Real, Imag, // "__real expr"/"__imag expr" Extension. 692 Extension, // __extension__ marker. 693 OffsetOf // __builtin_offsetof 694 }; 695private: 696 Stmt *Val; 697 Opcode Opc; 698 SourceLocation Loc; 699public: 700 701 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 702 : Expr(UnaryOperatorClass, type, 703 input->isTypeDependent() && opc != OffsetOf, 704 input->isValueDependent()), 705 Val(input), Opc(opc), Loc(l) {} 706 707 /// \brief Build an empty unary operator. 708 explicit UnaryOperator(EmptyShell Empty) 709 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 710 711 Opcode getOpcode() const { return Opc; } 712 void setOpcode(Opcode O) { Opc = O; } 713 714 Expr *getSubExpr() const { return cast<Expr>(Val); } 715 void setSubExpr(Expr *E) { Val = E; } 716 717 /// getOperatorLoc - Return the location of the operator. 718 SourceLocation getOperatorLoc() const { return Loc; } 719 void setOperatorLoc(SourceLocation L) { Loc = L; } 720 721 /// isPostfix - Return true if this is a postfix operation, like x++. 722 static bool isPostfix(Opcode Op) { 723 return Op == PostInc || Op == PostDec; 724 } 725 726 /// isPostfix - Return true if this is a prefix operation, like --x. 727 static bool isPrefix(Opcode Op) { 728 return Op == PreInc || Op == PreDec; 729 } 730 731 bool isPrefix() const { return isPrefix(Opc); } 732 bool isPostfix() const { return isPostfix(Opc); } 733 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 734 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 735 bool isOffsetOfOp() const { return Opc == OffsetOf; } 736 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 737 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 738 739 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 740 /// corresponds to, e.g. "sizeof" or "[pre]++" 741 static const char *getOpcodeStr(Opcode Op); 742 743 /// \brief Retrieve the unary opcode that corresponds to the given 744 /// overloaded operator. 745 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 746 747 /// \brief Retrieve the overloaded operator kind that corresponds to 748 /// the given unary opcode. 749 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 750 751 virtual SourceRange getSourceRange() const { 752 if (isPostfix()) 753 return SourceRange(Val->getLocStart(), Loc); 754 else 755 return SourceRange(Loc, Val->getLocEnd()); 756 } 757 virtual SourceLocation getExprLoc() const { return Loc; } 758 759 static bool classof(const Stmt *T) { 760 return T->getStmtClass() == UnaryOperatorClass; 761 } 762 static bool classof(const UnaryOperator *) { return true; } 763 764 // Iterators 765 virtual child_iterator child_begin(); 766 virtual child_iterator child_end(); 767}; 768 769/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 770/// types and expressions. 771class SizeOfAlignOfExpr : public Expr { 772 bool isSizeof : 1; // true if sizeof, false if alignof. 773 bool isType : 1; // true if operand is a type, false if an expression 774 union { 775 void *Ty; 776 Stmt *Ex; 777 } Argument; 778 SourceLocation OpLoc, RParenLoc; 779 780protected: 781 virtual void DoDestroy(ASTContext& C); 782 783public: 784 SizeOfAlignOfExpr(bool issizeof, QualType T, 785 QualType resultType, SourceLocation op, 786 SourceLocation rp) : 787 Expr(SizeOfAlignOfExprClass, resultType, 788 false, // Never type-dependent (C++ [temp.dep.expr]p3). 789 // Value-dependent if the argument is type-dependent. 790 T->isDependentType()), 791 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 792 Argument.Ty = T.getAsOpaquePtr(); 793 } 794 795 SizeOfAlignOfExpr(bool issizeof, Expr *E, 796 QualType resultType, SourceLocation op, 797 SourceLocation rp) : 798 Expr(SizeOfAlignOfExprClass, resultType, 799 false, // Never type-dependent (C++ [temp.dep.expr]p3). 800 // Value-dependent if the argument is type-dependent. 801 E->isTypeDependent()), 802 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 803 Argument.Ex = E; 804 } 805 806 /// \brief Construct an empty sizeof/alignof expression. 807 explicit SizeOfAlignOfExpr(EmptyShell Empty) 808 : Expr(SizeOfAlignOfExprClass, Empty) { } 809 810 bool isSizeOf() const { return isSizeof; } 811 void setSizeof(bool S) { isSizeof = S; } 812 813 bool isArgumentType() const { return isType; } 814 QualType getArgumentType() const { 815 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 816 return QualType::getFromOpaquePtr(Argument.Ty); 817 } 818 Expr *getArgumentExpr() { 819 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 820 return static_cast<Expr*>(Argument.Ex); 821 } 822 const Expr *getArgumentExpr() const { 823 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 824 } 825 826 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 827 void setArgument(QualType T) { 828 Argument.Ty = T.getAsOpaquePtr(); 829 isType = true; 830 } 831 832 /// Gets the argument type, or the type of the argument expression, whichever 833 /// is appropriate. 834 QualType getTypeOfArgument() const { 835 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 836 } 837 838 SourceLocation getOperatorLoc() const { return OpLoc; } 839 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 840 841 SourceLocation getRParenLoc() const { return RParenLoc; } 842 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 843 844 virtual SourceRange getSourceRange() const { 845 return SourceRange(OpLoc, RParenLoc); 846 } 847 848 static bool classof(const Stmt *T) { 849 return T->getStmtClass() == SizeOfAlignOfExprClass; 850 } 851 static bool classof(const SizeOfAlignOfExpr *) { return true; } 852 853 // Iterators 854 virtual child_iterator child_begin(); 855 virtual child_iterator child_end(); 856}; 857 858//===----------------------------------------------------------------------===// 859// Postfix Operators. 860//===----------------------------------------------------------------------===// 861 862/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 863class ArraySubscriptExpr : public Expr { 864 enum { LHS, RHS, END_EXPR=2 }; 865 Stmt* SubExprs[END_EXPR]; 866 SourceLocation RBracketLoc; 867public: 868 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 869 SourceLocation rbracketloc) 870 : Expr(ArraySubscriptExprClass, t, 871 lhs->isTypeDependent() || rhs->isTypeDependent(), 872 lhs->isValueDependent() || rhs->isValueDependent()), 873 RBracketLoc(rbracketloc) { 874 SubExprs[LHS] = lhs; 875 SubExprs[RHS] = rhs; 876 } 877 878 /// \brief Create an empty array subscript expression. 879 explicit ArraySubscriptExpr(EmptyShell Shell) 880 : Expr(ArraySubscriptExprClass, Shell) { } 881 882 /// An array access can be written A[4] or 4[A] (both are equivalent). 883 /// - getBase() and getIdx() always present the normalized view: A[4]. 884 /// In this case getBase() returns "A" and getIdx() returns "4". 885 /// - getLHS() and getRHS() present the syntactic view. e.g. for 886 /// 4[A] getLHS() returns "4". 887 /// Note: Because vector element access is also written A[4] we must 888 /// predicate the format conversion in getBase and getIdx only on the 889 /// the type of the RHS, as it is possible for the LHS to be a vector of 890 /// integer type 891 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 892 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 893 void setLHS(Expr *E) { SubExprs[LHS] = E; } 894 895 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 896 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 897 void setRHS(Expr *E) { SubExprs[RHS] = E; } 898 899 Expr *getBase() { 900 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 901 } 902 903 const Expr *getBase() const { 904 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 905 } 906 907 Expr *getIdx() { 908 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 909 } 910 911 const Expr *getIdx() const { 912 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 913 } 914 915 virtual SourceRange getSourceRange() const { 916 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 917 } 918 919 SourceLocation getRBracketLoc() const { return RBracketLoc; } 920 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 921 922 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 923 924 static bool classof(const Stmt *T) { 925 return T->getStmtClass() == ArraySubscriptExprClass; 926 } 927 static bool classof(const ArraySubscriptExpr *) { return true; } 928 929 // Iterators 930 virtual child_iterator child_begin(); 931 virtual child_iterator child_end(); 932}; 933 934 935/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 936/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 937/// while its subclasses may represent alternative syntax that (semantically) 938/// results in a function call. For example, CXXOperatorCallExpr is 939/// a subclass for overloaded operator calls that use operator syntax, e.g., 940/// "str1 + str2" to resolve to a function call. 941class CallExpr : public Expr { 942 enum { FN=0, ARGS_START=1 }; 943 Stmt **SubExprs; 944 unsigned NumArgs; 945 SourceLocation RParenLoc; 946 947protected: 948 // This version of the constructor is for derived classes. 949 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 950 QualType t, SourceLocation rparenloc); 951 952 virtual void DoDestroy(ASTContext& C); 953 954public: 955 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 956 SourceLocation rparenloc); 957 958 /// \brief Build an empty call expression. 959 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 960 961 ~CallExpr() {} 962 963 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 964 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 965 void setCallee(Expr *F) { SubExprs[FN] = F; } 966 967 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 968 FunctionDecl *getDirectCallee(); 969 970 /// getNumArgs - Return the number of actual arguments to this call. 971 /// 972 unsigned getNumArgs() const { return NumArgs; } 973 974 /// getArg - Return the specified argument. 975 Expr *getArg(unsigned Arg) { 976 assert(Arg < NumArgs && "Arg access out of range!"); 977 return cast<Expr>(SubExprs[Arg+ARGS_START]); 978 } 979 const Expr *getArg(unsigned Arg) const { 980 assert(Arg < NumArgs && "Arg access out of range!"); 981 return cast<Expr>(SubExprs[Arg+ARGS_START]); 982 } 983 984 /// setArg - Set the specified argument. 985 void setArg(unsigned Arg, Expr *ArgExpr) { 986 assert(Arg < NumArgs && "Arg access out of range!"); 987 SubExprs[Arg+ARGS_START] = ArgExpr; 988 } 989 990 /// setNumArgs - This changes the number of arguments present in this call. 991 /// Any orphaned expressions are deleted by this, and any new operands are set 992 /// to null. 993 void setNumArgs(ASTContext& C, unsigned NumArgs); 994 995 typedef ExprIterator arg_iterator; 996 typedef ConstExprIterator const_arg_iterator; 997 998 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 999 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1000 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1001 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1002 1003 /// getNumCommas - Return the number of commas that must have been present in 1004 /// this function call. 1005 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1006 1007 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1008 /// not, return 0. 1009 unsigned isBuiltinCall(ASTContext &Context) const; 1010 1011 /// getCallReturnType - Get the return type of the call expr. This is not 1012 /// always the type of the expr itself, if the return type is a reference 1013 /// type. 1014 QualType getCallReturnType() const; 1015 1016 SourceLocation getRParenLoc() const { return RParenLoc; } 1017 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1018 1019 virtual SourceRange getSourceRange() const { 1020 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1021 } 1022 1023 static bool classof(const Stmt *T) { 1024 return T->getStmtClass() == CallExprClass || 1025 T->getStmtClass() == CXXOperatorCallExprClass || 1026 T->getStmtClass() == CXXMemberCallExprClass; 1027 } 1028 static bool classof(const CallExpr *) { return true; } 1029 static bool classof(const CXXOperatorCallExpr *) { return true; } 1030 static bool classof(const CXXMemberCallExpr *) { return true; } 1031 1032 // Iterators 1033 virtual child_iterator child_begin(); 1034 virtual child_iterator child_end(); 1035}; 1036 1037/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1038/// 1039class MemberExpr : public Expr { 1040 /// Base - the expression for the base pointer or structure references. In 1041 /// X.F, this is "X". 1042 Stmt *Base; 1043 1044 /// MemberDecl - This is the decl being referenced by the field/member name. 1045 /// In X.F, this is the decl referenced by F. 1046 NamedDecl *MemberDecl; 1047 1048 /// MemberLoc - This is the location of the member name. 1049 SourceLocation MemberLoc; 1050 1051 /// IsArrow - True if this is "X->F", false if this is "X.F". 1052 bool IsArrow; 1053 1054protected: 1055 MemberExpr(StmtClass SC, Expr *base, bool isarrow, NamedDecl *memberdecl, 1056 SourceLocation l, QualType ty) 1057 : Expr(SC, ty, 1058 base->isTypeDependent(), base->isValueDependent()), 1059 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1060 1061public: 1062 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1063 QualType ty) 1064 : Expr(MemberExprClass, ty, 1065 base->isTypeDependent(), base->isValueDependent()), 1066 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1067 1068 /// \brief Build an empty member reference expression. 1069 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1070 1071 void setBase(Expr *E) { Base = E; } 1072 Expr *getBase() const { return cast<Expr>(Base); } 1073 1074 /// \brief Retrieve the member declaration to which this expression refers. 1075 /// 1076 /// The returned declaration will either be a FieldDecl or (in C++) 1077 /// a CXXMethodDecl. 1078 NamedDecl *getMemberDecl() const { return MemberDecl; } 1079 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1080 1081 /// \brief Determines whether this adorned member expression actually had 1082 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1083 /// x->Base::foo. 1084 bool hasQualifier() const; 1085 1086 bool isArrow() const { return IsArrow; } 1087 void setArrow(bool A) { IsArrow = A; } 1088 1089 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1090 /// location of 'F'. 1091 SourceLocation getMemberLoc() const { return MemberLoc; } 1092 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1093 1094 virtual SourceRange getSourceRange() const { 1095 // If we have an implicit base (like a C++ implicit this), 1096 // make sure not to return its location 1097 SourceLocation BaseLoc = getBase()->getLocStart(); 1098 if (BaseLoc.isInvalid()) 1099 return SourceRange(MemberLoc, MemberLoc); 1100 return SourceRange(BaseLoc, MemberLoc); 1101 } 1102 1103 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1104 1105 static bool classof(const Stmt *T) { 1106 return T->getStmtClass() == MemberExprClass || 1107 T->getStmtClass() == CXXAdornedMemberExprClass; 1108 } 1109 static bool classof(const MemberExpr *) { return true; } 1110 static bool classof(const CXXAdornedMemberExpr *) { return true; } 1111 1112 // Iterators 1113 virtual child_iterator child_begin(); 1114 virtual child_iterator child_end(); 1115}; 1116 1117/// CompoundLiteralExpr - [C99 6.5.2.5] 1118/// 1119class CompoundLiteralExpr : public Expr { 1120 /// LParenLoc - If non-null, this is the location of the left paren in a 1121 /// compound literal like "(int){4}". This can be null if this is a 1122 /// synthesized compound expression. 1123 SourceLocation LParenLoc; 1124 Stmt *Init; 1125 bool FileScope; 1126public: 1127 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1128 bool fileScope) 1129 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1130 FileScope(fileScope) {} 1131 1132 /// \brief Construct an empty compound literal. 1133 explicit CompoundLiteralExpr(EmptyShell Empty) 1134 : Expr(CompoundLiteralExprClass, Empty) { } 1135 1136 const Expr *getInitializer() const { return cast<Expr>(Init); } 1137 Expr *getInitializer() { return cast<Expr>(Init); } 1138 void setInitializer(Expr *E) { Init = E; } 1139 1140 bool isFileScope() const { return FileScope; } 1141 void setFileScope(bool FS) { FileScope = FS; } 1142 1143 SourceLocation getLParenLoc() const { return LParenLoc; } 1144 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1145 1146 virtual SourceRange getSourceRange() const { 1147 // FIXME: Init should never be null. 1148 if (!Init) 1149 return SourceRange(); 1150 if (LParenLoc.isInvalid()) 1151 return Init->getSourceRange(); 1152 return SourceRange(LParenLoc, Init->getLocEnd()); 1153 } 1154 1155 static bool classof(const Stmt *T) { 1156 return T->getStmtClass() == CompoundLiteralExprClass; 1157 } 1158 static bool classof(const CompoundLiteralExpr *) { return true; } 1159 1160 // Iterators 1161 virtual child_iterator child_begin(); 1162 virtual child_iterator child_end(); 1163}; 1164 1165/// CastExpr - Base class for type casts, including both implicit 1166/// casts (ImplicitCastExpr) and explicit casts that have some 1167/// representation in the source code (ExplicitCastExpr's derived 1168/// classes). 1169class CastExpr : public Expr { 1170public: 1171 /// CastKind - the kind of cast this represents. 1172 enum CastKind { 1173 /// CK_Unknown - Unknown cast kind. 1174 /// FIXME: The goal is to get rid of this and make all casts have a 1175 /// kind so that the AST client doesn't have to try to figure out what's 1176 /// going on. 1177 CK_Unknown, 1178 1179 /// CK_BitCast - Used for reinterpret_cast. 1180 CK_BitCast, 1181 1182 /// CK_NoOp - Used for const_cast. 1183 CK_NoOp, 1184 1185 /// CK_DerivedToBase - Derived to base class casts. 1186 CK_DerivedToBase, 1187 1188 /// CK_Dynamic - Dynamic cast. 1189 CK_Dynamic, 1190 1191 /// CK_ToUnion - Cast to union (GCC extension). 1192 CK_ToUnion, 1193 1194 /// CK_ArrayToPointerDecay - Array to pointer decay. 1195 CK_ArrayToPointerDecay, 1196 1197 /// CK_NullToMemberPointer - Null pointer to member pointer. 1198 CK_NullToMemberPointer, 1199 1200 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1201 /// member pointer in derived class. 1202 CK_BaseToDerivedMemberPointer, 1203 1204 /// CK_UserDefinedConversion - Conversion using a user defined type 1205 /// conversion function. 1206 CK_UserDefinedConversion, 1207 1208 /// CK_ConstructorConversion - Conversion by constructor 1209 CK_ConstructorConversion 1210 }; 1211 1212 struct CastInfo { 1213 const CastKind Kind; 1214 1215 // FIXME: This should assert that the CastKind does not require extra 1216 // information. 1217 CastInfo(CastKind Kind) 1218 : Kind(Kind) { } 1219 }; 1220 1221private: 1222 CastKind Kind; 1223 Stmt *Op; 1224protected: 1225 CastExpr(StmtClass SC, QualType ty, const CastInfo &info, Expr *op) : 1226 Expr(SC, ty, 1227 // Cast expressions are type-dependent if the type is 1228 // dependent (C++ [temp.dep.expr]p3). 1229 ty->isDependentType(), 1230 // Cast expressions are value-dependent if the type is 1231 // dependent or if the subexpression is value-dependent. 1232 ty->isDependentType() || (op && op->isValueDependent())), 1233 Kind(info.Kind), Op(op) {} 1234 1235 /// \brief Construct an empty cast. 1236 CastExpr(StmtClass SC, EmptyShell Empty) 1237 : Expr(SC, Empty) { } 1238 1239public: 1240 CastKind getCastKind() const { return Kind; } 1241 void setCastKind(CastKind K) { Kind = K; } 1242 1243 Expr *getSubExpr() { return cast<Expr>(Op); } 1244 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1245 void setSubExpr(Expr *E) { Op = E; } 1246 1247 static bool classof(const Stmt *T) { 1248 StmtClass SC = T->getStmtClass(); 1249 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1250 return true; 1251 1252 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1253 return true; 1254 1255 return false; 1256 } 1257 static bool classof(const CastExpr *) { return true; } 1258 1259 // Iterators 1260 virtual child_iterator child_begin(); 1261 virtual child_iterator child_end(); 1262}; 1263 1264/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1265/// conversions, which have no direct representation in the original 1266/// source code. For example: converting T[]->T*, void f()->void 1267/// (*f)(), float->double, short->int, etc. 1268/// 1269/// In C, implicit casts always produce rvalues. However, in C++, an 1270/// implicit cast whose result is being bound to a reference will be 1271/// an lvalue. For example: 1272/// 1273/// @code 1274/// class Base { }; 1275/// class Derived : public Base { }; 1276/// void f(Derived d) { 1277/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1278/// } 1279/// @endcode 1280class ImplicitCastExpr : public CastExpr { 1281 /// LvalueCast - Whether this cast produces an lvalue. 1282 bool LvalueCast; 1283 1284public: 1285 ImplicitCastExpr(QualType ty, const CastInfo &info, Expr *op, bool Lvalue) : 1286 CastExpr(ImplicitCastExprClass, ty, info, op), LvalueCast(Lvalue) { } 1287 1288 /// \brief Construct an empty implicit cast. 1289 explicit ImplicitCastExpr(EmptyShell Shell) 1290 : CastExpr(ImplicitCastExprClass, Shell) { } 1291 1292 1293 virtual SourceRange getSourceRange() const { 1294 return getSubExpr()->getSourceRange(); 1295 } 1296 1297 /// isLvalueCast - Whether this cast produces an lvalue. 1298 bool isLvalueCast() const { return LvalueCast; } 1299 1300 /// setLvalueCast - Set whether this cast produces an lvalue. 1301 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1302 1303 static bool classof(const Stmt *T) { 1304 return T->getStmtClass() == ImplicitCastExprClass; 1305 } 1306 static bool classof(const ImplicitCastExpr *) { return true; } 1307}; 1308 1309/// ExplicitCastExpr - An explicit cast written in the source 1310/// code. 1311/// 1312/// This class is effectively an abstract class, because it provides 1313/// the basic representation of an explicitly-written cast without 1314/// specifying which kind of cast (C cast, functional cast, static 1315/// cast, etc.) was written; specific derived classes represent the 1316/// particular style of cast and its location information. 1317/// 1318/// Unlike implicit casts, explicit cast nodes have two different 1319/// types: the type that was written into the source code, and the 1320/// actual type of the expression as determined by semantic 1321/// analysis. These types may differ slightly. For example, in C++ one 1322/// can cast to a reference type, which indicates that the resulting 1323/// expression will be an lvalue. The reference type, however, will 1324/// not be used as the type of the expression. 1325class ExplicitCastExpr : public CastExpr { 1326 /// TypeAsWritten - The type that this expression is casting to, as 1327 /// written in the source code. 1328 QualType TypeAsWritten; 1329 1330protected: 1331 ExplicitCastExpr(StmtClass SC, QualType exprTy, const CastInfo &info, 1332 Expr *op, QualType writtenTy) 1333 : CastExpr(SC, exprTy, info, op), TypeAsWritten(writtenTy) {} 1334 1335 /// \brief Construct an empty explicit cast. 1336 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1337 : CastExpr(SC, Shell) { } 1338 1339public: 1340 /// getTypeAsWritten - Returns the type that this expression is 1341 /// casting to, as written in the source code. 1342 QualType getTypeAsWritten() const { return TypeAsWritten; } 1343 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1344 1345 static bool classof(const Stmt *T) { 1346 StmtClass SC = T->getStmtClass(); 1347 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1348 return true; 1349 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1350 return true; 1351 1352 return false; 1353 } 1354 static bool classof(const ExplicitCastExpr *) { return true; } 1355}; 1356 1357/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1358/// cast in C++ (C++ [expr.cast]), which uses the syntax 1359/// (Type)expr. For example: @c (int)f. 1360class CStyleCastExpr : public ExplicitCastExpr { 1361 SourceLocation LPLoc; // the location of the left paren 1362 SourceLocation RPLoc; // the location of the right paren 1363public: 1364 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1365 SourceLocation l, SourceLocation r) : 1366 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1367 LPLoc(l), RPLoc(r) {} 1368 1369 /// \brief Construct an empty C-style explicit cast. 1370 explicit CStyleCastExpr(EmptyShell Shell) 1371 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1372 1373 SourceLocation getLParenLoc() const { return LPLoc; } 1374 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1375 1376 SourceLocation getRParenLoc() const { return RPLoc; } 1377 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1378 1379 virtual SourceRange getSourceRange() const { 1380 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1381 } 1382 static bool classof(const Stmt *T) { 1383 return T->getStmtClass() == CStyleCastExprClass; 1384 } 1385 static bool classof(const CStyleCastExpr *) { return true; } 1386}; 1387 1388/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1389/// 1390/// This expression node kind describes a builtin binary operation, 1391/// such as "x + y" for integer values "x" and "y". The operands will 1392/// already have been converted to appropriate types (e.g., by 1393/// performing promotions or conversions). 1394/// 1395/// In C++, where operators may be overloaded, a different kind of 1396/// expression node (CXXOperatorCallExpr) is used to express the 1397/// invocation of an overloaded operator with operator syntax. Within 1398/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1399/// used to store an expression "x + y" depends on the subexpressions 1400/// for x and y. If neither x or y is type-dependent, and the "+" 1401/// operator resolves to a built-in operation, BinaryOperator will be 1402/// used to express the computation (x and y may still be 1403/// value-dependent). If either x or y is type-dependent, or if the 1404/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1405/// be used to express the computation. 1406class BinaryOperator : public Expr { 1407public: 1408 enum Opcode { 1409 // Operators listed in order of precedence. 1410 // Note that additions to this should also update the StmtVisitor class. 1411 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1412 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1413 Add, Sub, // [C99 6.5.6] Additive operators. 1414 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1415 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1416 EQ, NE, // [C99 6.5.9] Equality operators. 1417 And, // [C99 6.5.10] Bitwise AND operator. 1418 Xor, // [C99 6.5.11] Bitwise XOR operator. 1419 Or, // [C99 6.5.12] Bitwise OR operator. 1420 LAnd, // [C99 6.5.13] Logical AND operator. 1421 LOr, // [C99 6.5.14] Logical OR operator. 1422 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1423 DivAssign, RemAssign, 1424 AddAssign, SubAssign, 1425 ShlAssign, ShrAssign, 1426 AndAssign, XorAssign, 1427 OrAssign, 1428 Comma // [C99 6.5.17] Comma operator. 1429 }; 1430private: 1431 enum { LHS, RHS, END_EXPR }; 1432 Stmt* SubExprs[END_EXPR]; 1433 Opcode Opc; 1434 SourceLocation OpLoc; 1435public: 1436 1437 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1438 SourceLocation opLoc) 1439 : Expr(BinaryOperatorClass, ResTy, 1440 lhs->isTypeDependent() || rhs->isTypeDependent(), 1441 lhs->isValueDependent() || rhs->isValueDependent()), 1442 Opc(opc), OpLoc(opLoc) { 1443 SubExprs[LHS] = lhs; 1444 SubExprs[RHS] = rhs; 1445 assert(!isCompoundAssignmentOp() && 1446 "Use ArithAssignBinaryOperator for compound assignments"); 1447 } 1448 1449 /// \brief Construct an empty binary operator. 1450 explicit BinaryOperator(EmptyShell Empty) 1451 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1452 1453 SourceLocation getOperatorLoc() const { return OpLoc; } 1454 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1455 1456 Opcode getOpcode() const { return Opc; } 1457 void setOpcode(Opcode O) { Opc = O; } 1458 1459 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1460 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1461 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1462 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1463 1464 virtual SourceRange getSourceRange() const { 1465 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1466 } 1467 1468 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1469 /// corresponds to, e.g. "<<=". 1470 static const char *getOpcodeStr(Opcode Op); 1471 1472 /// \brief Retrieve the binary opcode that corresponds to the given 1473 /// overloaded operator. 1474 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1475 1476 /// \brief Retrieve the overloaded operator kind that corresponds to 1477 /// the given binary opcode. 1478 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1479 1480 /// predicates to categorize the respective opcodes. 1481 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1482 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1483 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1484 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1485 1486 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1487 bool isRelationalOp() const { return isRelationalOp(Opc); } 1488 1489 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1490 bool isEqualityOp() const { return isEqualityOp(Opc); } 1491 1492 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1493 bool isLogicalOp() const { return isLogicalOp(Opc); } 1494 1495 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1496 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1497 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1498 1499 static bool classof(const Stmt *S) { 1500 return S->getStmtClass() == BinaryOperatorClass || 1501 S->getStmtClass() == CompoundAssignOperatorClass; 1502 } 1503 static bool classof(const BinaryOperator *) { return true; } 1504 1505 // Iterators 1506 virtual child_iterator child_begin(); 1507 virtual child_iterator child_end(); 1508 1509protected: 1510 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1511 SourceLocation oploc, bool dead) 1512 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1513 SubExprs[LHS] = lhs; 1514 SubExprs[RHS] = rhs; 1515 } 1516 1517 BinaryOperator(StmtClass SC, EmptyShell Empty) 1518 : Expr(SC, Empty), Opc(MulAssign) { } 1519}; 1520 1521/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1522/// track of the type the operation is performed in. Due to the semantics of 1523/// these operators, the operands are promoted, the aritmetic performed, an 1524/// implicit conversion back to the result type done, then the assignment takes 1525/// place. This captures the intermediate type which the computation is done 1526/// in. 1527class CompoundAssignOperator : public BinaryOperator { 1528 QualType ComputationLHSType; 1529 QualType ComputationResultType; 1530public: 1531 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1532 QualType ResType, QualType CompLHSType, 1533 QualType CompResultType, 1534 SourceLocation OpLoc) 1535 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1536 ComputationLHSType(CompLHSType), 1537 ComputationResultType(CompResultType) { 1538 assert(isCompoundAssignmentOp() && 1539 "Only should be used for compound assignments"); 1540 } 1541 1542 /// \brief Build an empty compound assignment operator expression. 1543 explicit CompoundAssignOperator(EmptyShell Empty) 1544 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1545 1546 // The two computation types are the type the LHS is converted 1547 // to for the computation and the type of the result; the two are 1548 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1549 QualType getComputationLHSType() const { return ComputationLHSType; } 1550 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1551 1552 QualType getComputationResultType() const { return ComputationResultType; } 1553 void setComputationResultType(QualType T) { ComputationResultType = T; } 1554 1555 static bool classof(const CompoundAssignOperator *) { return true; } 1556 static bool classof(const Stmt *S) { 1557 return S->getStmtClass() == CompoundAssignOperatorClass; 1558 } 1559}; 1560 1561/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1562/// GNU "missing LHS" extension is in use. 1563/// 1564class ConditionalOperator : public Expr { 1565 enum { COND, LHS, RHS, END_EXPR }; 1566 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1567 SourceLocation QuestionLoc, ColonLoc; 1568public: 1569 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1570 SourceLocation CLoc, Expr *rhs, QualType t) 1571 : Expr(ConditionalOperatorClass, t, 1572 // FIXME: the type of the conditional operator doesn't 1573 // depend on the type of the conditional, but the standard 1574 // seems to imply that it could. File a bug! 1575 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1576 (cond->isValueDependent() || 1577 (lhs && lhs->isValueDependent()) || 1578 (rhs && rhs->isValueDependent()))), 1579 QuestionLoc(QLoc), 1580 ColonLoc(CLoc) { 1581 SubExprs[COND] = cond; 1582 SubExprs[LHS] = lhs; 1583 SubExprs[RHS] = rhs; 1584 } 1585 1586 /// \brief Build an empty conditional operator. 1587 explicit ConditionalOperator(EmptyShell Empty) 1588 : Expr(ConditionalOperatorClass, Empty) { } 1589 1590 // getCond - Return the expression representing the condition for 1591 // the ?: operator. 1592 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1593 void setCond(Expr *E) { SubExprs[COND] = E; } 1594 1595 // getTrueExpr - Return the subexpression representing the value of the ?: 1596 // expression if the condition evaluates to true. In most cases this value 1597 // will be the same as getLHS() except a GCC extension allows the left 1598 // subexpression to be omitted, and instead of the condition be returned. 1599 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1600 // is only evaluated once. 1601 Expr *getTrueExpr() const { 1602 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1603 } 1604 1605 // getTrueExpr - Return the subexpression representing the value of the ?: 1606 // expression if the condition evaluates to false. This is the same as getRHS. 1607 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1608 1609 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1610 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1611 1612 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1613 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1614 1615 SourceLocation getQuestionLoc() const { return QuestionLoc; } 1616 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 1617 1618 SourceLocation getColonLoc() const { return ColonLoc; } 1619 void setColonLoc(SourceLocation L) { ColonLoc = L; } 1620 1621 virtual SourceRange getSourceRange() const { 1622 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1623 } 1624 static bool classof(const Stmt *T) { 1625 return T->getStmtClass() == ConditionalOperatorClass; 1626 } 1627 static bool classof(const ConditionalOperator *) { return true; } 1628 1629 // Iterators 1630 virtual child_iterator child_begin(); 1631 virtual child_iterator child_end(); 1632}; 1633 1634/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1635class AddrLabelExpr : public Expr { 1636 SourceLocation AmpAmpLoc, LabelLoc; 1637 LabelStmt *Label; 1638public: 1639 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1640 QualType t) 1641 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1642 1643 /// \brief Build an empty address of a label expression. 1644 explicit AddrLabelExpr(EmptyShell Empty) 1645 : Expr(AddrLabelExprClass, Empty) { } 1646 1647 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1648 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1649 SourceLocation getLabelLoc() const { return LabelLoc; } 1650 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1651 1652 virtual SourceRange getSourceRange() const { 1653 return SourceRange(AmpAmpLoc, LabelLoc); 1654 } 1655 1656 LabelStmt *getLabel() const { return Label; } 1657 void setLabel(LabelStmt *S) { Label = S; } 1658 1659 static bool classof(const Stmt *T) { 1660 return T->getStmtClass() == AddrLabelExprClass; 1661 } 1662 static bool classof(const AddrLabelExpr *) { return true; } 1663 1664 // Iterators 1665 virtual child_iterator child_begin(); 1666 virtual child_iterator child_end(); 1667}; 1668 1669/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1670/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1671/// takes the value of the last subexpression. 1672class StmtExpr : public Expr { 1673 Stmt *SubStmt; 1674 SourceLocation LParenLoc, RParenLoc; 1675public: 1676 StmtExpr(CompoundStmt *substmt, QualType T, 1677 SourceLocation lp, SourceLocation rp) : 1678 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1679 1680 /// \brief Build an empty statement expression. 1681 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 1682 1683 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1684 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1685 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 1686 1687 virtual SourceRange getSourceRange() const { 1688 return SourceRange(LParenLoc, RParenLoc); 1689 } 1690 1691 SourceLocation getLParenLoc() const { return LParenLoc; } 1692 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1693 SourceLocation getRParenLoc() const { return RParenLoc; } 1694 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1695 1696 static bool classof(const Stmt *T) { 1697 return T->getStmtClass() == StmtExprClass; 1698 } 1699 static bool classof(const StmtExpr *) { return true; } 1700 1701 // Iterators 1702 virtual child_iterator child_begin(); 1703 virtual child_iterator child_end(); 1704}; 1705 1706/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 1707/// This AST node represents a function that returns 1 if two *types* (not 1708/// expressions) are compatible. The result of this built-in function can be 1709/// used in integer constant expressions. 1710class TypesCompatibleExpr : public Expr { 1711 QualType Type1; 1712 QualType Type2; 1713 SourceLocation BuiltinLoc, RParenLoc; 1714public: 1715 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1716 QualType t1, QualType t2, SourceLocation RP) : 1717 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1718 BuiltinLoc(BLoc), RParenLoc(RP) {} 1719 1720 /// \brief Build an empty __builtin_type_compatible_p expression. 1721 explicit TypesCompatibleExpr(EmptyShell Empty) 1722 : Expr(TypesCompatibleExprClass, Empty) { } 1723 1724 QualType getArgType1() const { return Type1; } 1725 void setArgType1(QualType T) { Type1 = T; } 1726 QualType getArgType2() const { return Type2; } 1727 void setArgType2(QualType T) { Type2 = T; } 1728 1729 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1730 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1731 1732 SourceLocation getRParenLoc() const { return RParenLoc; } 1733 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1734 1735 virtual SourceRange getSourceRange() const { 1736 return SourceRange(BuiltinLoc, RParenLoc); 1737 } 1738 static bool classof(const Stmt *T) { 1739 return T->getStmtClass() == TypesCompatibleExprClass; 1740 } 1741 static bool classof(const TypesCompatibleExpr *) { return true; } 1742 1743 // Iterators 1744 virtual child_iterator child_begin(); 1745 virtual child_iterator child_end(); 1746}; 1747 1748/// ShuffleVectorExpr - clang-specific builtin-in function 1749/// __builtin_shufflevector. 1750/// This AST node represents a operator that does a constant 1751/// shuffle, similar to LLVM's shufflevector instruction. It takes 1752/// two vectors and a variable number of constant indices, 1753/// and returns the appropriately shuffled vector. 1754class ShuffleVectorExpr : public Expr { 1755 SourceLocation BuiltinLoc, RParenLoc; 1756 1757 // SubExprs - the list of values passed to the __builtin_shufflevector 1758 // function. The first two are vectors, and the rest are constant 1759 // indices. The number of values in this list is always 1760 // 2+the number of indices in the vector type. 1761 Stmt **SubExprs; 1762 unsigned NumExprs; 1763 1764protected: 1765 virtual void DoDestroy(ASTContext &C); 1766 1767public: 1768 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 1769 QualType Type, SourceLocation BLoc, 1770 SourceLocation RP) : 1771 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1772 RParenLoc(RP), NumExprs(nexpr) { 1773 1774 SubExprs = new (C) Stmt*[nexpr]; 1775 for (unsigned i = 0; i < nexpr; i++) 1776 SubExprs[i] = args[i]; 1777 } 1778 1779 /// \brief Build an empty vector-shuffle expression. 1780 explicit ShuffleVectorExpr(EmptyShell Empty) 1781 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1782 1783 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1784 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1785 1786 SourceLocation getRParenLoc() const { return RParenLoc; } 1787 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1788 1789 virtual SourceRange getSourceRange() const { 1790 return SourceRange(BuiltinLoc, RParenLoc); 1791 } 1792 static bool classof(const Stmt *T) { 1793 return T->getStmtClass() == ShuffleVectorExprClass; 1794 } 1795 static bool classof(const ShuffleVectorExpr *) { return true; } 1796 1797 ~ShuffleVectorExpr() {} 1798 1799 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1800 /// constant expression, the actual arguments passed in, and the function 1801 /// pointers. 1802 unsigned getNumSubExprs() const { return NumExprs; } 1803 1804 /// getExpr - Return the Expr at the specified index. 1805 Expr *getExpr(unsigned Index) { 1806 assert((Index < NumExprs) && "Arg access out of range!"); 1807 return cast<Expr>(SubExprs[Index]); 1808 } 1809 const Expr *getExpr(unsigned Index) const { 1810 assert((Index < NumExprs) && "Arg access out of range!"); 1811 return cast<Expr>(SubExprs[Index]); 1812 } 1813 1814 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 1815 1816 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1817 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1818 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 1819 } 1820 1821 // Iterators 1822 virtual child_iterator child_begin(); 1823 virtual child_iterator child_end(); 1824}; 1825 1826/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1827/// This AST node is similar to the conditional operator (?:) in C, with 1828/// the following exceptions: 1829/// - the test expression must be a integer constant expression. 1830/// - the expression returned acts like the chosen subexpression in every 1831/// visible way: the type is the same as that of the chosen subexpression, 1832/// and all predicates (whether it's an l-value, whether it's an integer 1833/// constant expression, etc.) return the same result as for the chosen 1834/// sub-expression. 1835class ChooseExpr : public Expr { 1836 enum { COND, LHS, RHS, END_EXPR }; 1837 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1838 SourceLocation BuiltinLoc, RParenLoc; 1839public: 1840 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1841 SourceLocation RP) 1842 : Expr(ChooseExprClass, t), 1843 BuiltinLoc(BLoc), RParenLoc(RP) { 1844 SubExprs[COND] = cond; 1845 SubExprs[LHS] = lhs; 1846 SubExprs[RHS] = rhs; 1847 } 1848 1849 /// \brief Build an empty __builtin_choose_expr. 1850 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1851 1852 /// isConditionTrue - Return whether the condition is true (i.e. not 1853 /// equal to zero). 1854 bool isConditionTrue(ASTContext &C) const; 1855 1856 /// getChosenSubExpr - Return the subexpression chosen according to the 1857 /// condition. 1858 Expr *getChosenSubExpr(ASTContext &C) const { 1859 return isConditionTrue(C) ? getLHS() : getRHS(); 1860 } 1861 1862 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1863 void setCond(Expr *E) { SubExprs[COND] = E; } 1864 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1865 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1866 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1867 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1868 1869 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1870 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1871 1872 SourceLocation getRParenLoc() const { return RParenLoc; } 1873 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1874 1875 virtual SourceRange getSourceRange() const { 1876 return SourceRange(BuiltinLoc, RParenLoc); 1877 } 1878 static bool classof(const Stmt *T) { 1879 return T->getStmtClass() == ChooseExprClass; 1880 } 1881 static bool classof(const ChooseExpr *) { return true; } 1882 1883 // Iterators 1884 virtual child_iterator child_begin(); 1885 virtual child_iterator child_end(); 1886}; 1887 1888/// GNUNullExpr - Implements the GNU __null extension, which is a name 1889/// for a null pointer constant that has integral type (e.g., int or 1890/// long) and is the same size and alignment as a pointer. The __null 1891/// extension is typically only used by system headers, which define 1892/// NULL as __null in C++ rather than using 0 (which is an integer 1893/// that may not match the size of a pointer). 1894class GNUNullExpr : public Expr { 1895 /// TokenLoc - The location of the __null keyword. 1896 SourceLocation TokenLoc; 1897 1898public: 1899 GNUNullExpr(QualType Ty, SourceLocation Loc) 1900 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1901 1902 /// \brief Build an empty GNU __null expression. 1903 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1904 1905 /// getTokenLocation - The location of the __null token. 1906 SourceLocation getTokenLocation() const { return TokenLoc; } 1907 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1908 1909 virtual SourceRange getSourceRange() const { 1910 return SourceRange(TokenLoc); 1911 } 1912 static bool classof(const Stmt *T) { 1913 return T->getStmtClass() == GNUNullExprClass; 1914 } 1915 static bool classof(const GNUNullExpr *) { return true; } 1916 1917 // Iterators 1918 virtual child_iterator child_begin(); 1919 virtual child_iterator child_end(); 1920}; 1921 1922/// VAArgExpr, used for the builtin function __builtin_va_start. 1923class VAArgExpr : public Expr { 1924 Stmt *Val; 1925 SourceLocation BuiltinLoc, RParenLoc; 1926public: 1927 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1928 : Expr(VAArgExprClass, t), 1929 Val(e), 1930 BuiltinLoc(BLoc), 1931 RParenLoc(RPLoc) { } 1932 1933 /// \brief Create an empty __builtin_va_start expression. 1934 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1935 1936 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1937 Expr *getSubExpr() { return cast<Expr>(Val); } 1938 void setSubExpr(Expr *E) { Val = E; } 1939 1940 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1941 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1942 1943 SourceLocation getRParenLoc() const { return RParenLoc; } 1944 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1945 1946 virtual SourceRange getSourceRange() const { 1947 return SourceRange(BuiltinLoc, RParenLoc); 1948 } 1949 static bool classof(const Stmt *T) { 1950 return T->getStmtClass() == VAArgExprClass; 1951 } 1952 static bool classof(const VAArgExpr *) { return true; } 1953 1954 // Iterators 1955 virtual child_iterator child_begin(); 1956 virtual child_iterator child_end(); 1957}; 1958 1959/// @brief Describes an C or C++ initializer list. 1960/// 1961/// InitListExpr describes an initializer list, which can be used to 1962/// initialize objects of different types, including 1963/// struct/class/union types, arrays, and vectors. For example: 1964/// 1965/// @code 1966/// struct foo x = { 1, { 2, 3 } }; 1967/// @endcode 1968/// 1969/// Prior to semantic analysis, an initializer list will represent the 1970/// initializer list as written by the user, but will have the 1971/// placeholder type "void". This initializer list is called the 1972/// syntactic form of the initializer, and may contain C99 designated 1973/// initializers (represented as DesignatedInitExprs), initializations 1974/// of subobject members without explicit braces, and so on. Clients 1975/// interested in the original syntax of the initializer list should 1976/// use the syntactic form of the initializer list. 1977/// 1978/// After semantic analysis, the initializer list will represent the 1979/// semantic form of the initializer, where the initializations of all 1980/// subobjects are made explicit with nested InitListExpr nodes and 1981/// C99 designators have been eliminated by placing the designated 1982/// initializations into the subobject they initialize. Additionally, 1983/// any "holes" in the initialization, where no initializer has been 1984/// specified for a particular subobject, will be replaced with 1985/// implicitly-generated ImplicitValueInitExpr expressions that 1986/// value-initialize the subobjects. Note, however, that the 1987/// initializer lists may still have fewer initializers than there are 1988/// elements to initialize within the object. 1989/// 1990/// Given the semantic form of the initializer list, one can retrieve 1991/// the original syntactic form of that initializer list (if it 1992/// exists) using getSyntacticForm(). Since many initializer lists 1993/// have the same syntactic and semantic forms, getSyntacticForm() may 1994/// return NULL, indicating that the current initializer list also 1995/// serves as its syntactic form. 1996class InitListExpr : public Expr { 1997 // FIXME: Eliminate this vector in favor of ASTContext allocation 1998 std::vector<Stmt *> InitExprs; 1999 SourceLocation LBraceLoc, RBraceLoc; 2000 2001 /// Contains the initializer list that describes the syntactic form 2002 /// written in the source code. 2003 InitListExpr *SyntacticForm; 2004 2005 /// If this initializer list initializes a union, specifies which 2006 /// field within the union will be initialized. 2007 FieldDecl *UnionFieldInit; 2008 2009 /// Whether this initializer list originally had a GNU array-range 2010 /// designator in it. This is a temporary marker used by CodeGen. 2011 bool HadArrayRangeDesignator; 2012 2013public: 2014 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2015 SourceLocation rbraceloc); 2016 2017 /// \brief Build an empty initializer list. 2018 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2019 2020 unsigned getNumInits() const { return InitExprs.size(); } 2021 2022 const Expr* getInit(unsigned Init) const { 2023 assert(Init < getNumInits() && "Initializer access out of range!"); 2024 return cast_or_null<Expr>(InitExprs[Init]); 2025 } 2026 2027 Expr* getInit(unsigned Init) { 2028 assert(Init < getNumInits() && "Initializer access out of range!"); 2029 return cast_or_null<Expr>(InitExprs[Init]); 2030 } 2031 2032 void setInit(unsigned Init, Expr *expr) { 2033 assert(Init < getNumInits() && "Initializer access out of range!"); 2034 InitExprs[Init] = expr; 2035 } 2036 2037 /// \brief Reserve space for some number of initializers. 2038 void reserveInits(unsigned NumInits); 2039 2040 /// @brief Specify the number of initializers 2041 /// 2042 /// If there are more than @p NumInits initializers, the remaining 2043 /// initializers will be destroyed. If there are fewer than @p 2044 /// NumInits initializers, NULL expressions will be added for the 2045 /// unknown initializers. 2046 void resizeInits(ASTContext &Context, unsigned NumInits); 2047 2048 /// @brief Updates the initializer at index @p Init with the new 2049 /// expression @p expr, and returns the old expression at that 2050 /// location. 2051 /// 2052 /// When @p Init is out of range for this initializer list, the 2053 /// initializer list will be extended with NULL expressions to 2054 /// accomodate the new entry. 2055 Expr *updateInit(unsigned Init, Expr *expr); 2056 2057 /// \brief If this initializes a union, specifies which field in the 2058 /// union to initialize. 2059 /// 2060 /// Typically, this field is the first named field within the 2061 /// union. However, a designated initializer can specify the 2062 /// initialization of a different field within the union. 2063 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2064 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2065 2066 // Explicit InitListExpr's originate from source code (and have valid source 2067 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2068 bool isExplicit() { 2069 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2070 } 2071 2072 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2073 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2074 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2075 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2076 2077 /// @brief Retrieve the initializer list that describes the 2078 /// syntactic form of the initializer. 2079 /// 2080 /// 2081 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2082 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2083 2084 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2085 void sawArrayRangeDesignator(bool ARD = true) { 2086 HadArrayRangeDesignator = ARD; 2087 } 2088 2089 virtual SourceRange getSourceRange() const { 2090 return SourceRange(LBraceLoc, RBraceLoc); 2091 } 2092 static bool classof(const Stmt *T) { 2093 return T->getStmtClass() == InitListExprClass; 2094 } 2095 static bool classof(const InitListExpr *) { return true; } 2096 2097 // Iterators 2098 virtual child_iterator child_begin(); 2099 virtual child_iterator child_end(); 2100 2101 typedef std::vector<Stmt *>::iterator iterator; 2102 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2103 2104 iterator begin() { return InitExprs.begin(); } 2105 iterator end() { return InitExprs.end(); } 2106 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2107 reverse_iterator rend() { return InitExprs.rend(); } 2108}; 2109 2110/// @brief Represents a C99 designated initializer expression. 2111/// 2112/// A designated initializer expression (C99 6.7.8) contains one or 2113/// more designators (which can be field designators, array 2114/// designators, or GNU array-range designators) followed by an 2115/// expression that initializes the field or element(s) that the 2116/// designators refer to. For example, given: 2117/// 2118/// @code 2119/// struct point { 2120/// double x; 2121/// double y; 2122/// }; 2123/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2124/// @endcode 2125/// 2126/// The InitListExpr contains three DesignatedInitExprs, the first of 2127/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2128/// designators, one array designator for @c [2] followed by one field 2129/// designator for @c .y. The initalization expression will be 1.0. 2130class DesignatedInitExpr : public Expr { 2131public: 2132 /// \brief Forward declaration of the Designator class. 2133 class Designator; 2134 2135private: 2136 /// The location of the '=' or ':' prior to the actual initializer 2137 /// expression. 2138 SourceLocation EqualOrColonLoc; 2139 2140 /// Whether this designated initializer used the GNU deprecated 2141 /// syntax rather than the C99 '=' syntax. 2142 bool GNUSyntax : 1; 2143 2144 /// The number of designators in this initializer expression. 2145 unsigned NumDesignators : 15; 2146 2147 /// \brief The designators in this designated initialization 2148 /// expression. 2149 Designator *Designators; 2150 2151 /// The number of subexpressions of this initializer expression, 2152 /// which contains both the initializer and any additional 2153 /// expressions used by array and array-range designators. 2154 unsigned NumSubExprs : 16; 2155 2156 2157 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2158 const Designator *Designators, 2159 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2160 Expr **IndexExprs, unsigned NumIndexExprs, 2161 Expr *Init); 2162 2163 explicit DesignatedInitExpr(unsigned NumSubExprs) 2164 : Expr(DesignatedInitExprClass, EmptyShell()), 2165 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2166 2167protected: 2168 virtual void DoDestroy(ASTContext &C); 2169 2170public: 2171 /// A field designator, e.g., ".x". 2172 struct FieldDesignator { 2173 /// Refers to the field that is being initialized. The low bit 2174 /// of this field determines whether this is actually a pointer 2175 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2176 /// initially constructed, a field designator will store an 2177 /// IdentifierInfo*. After semantic analysis has resolved that 2178 /// name, the field designator will instead store a FieldDecl*. 2179 uintptr_t NameOrField; 2180 2181 /// The location of the '.' in the designated initializer. 2182 unsigned DotLoc; 2183 2184 /// The location of the field name in the designated initializer. 2185 unsigned FieldLoc; 2186 }; 2187 2188 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2189 struct ArrayOrRangeDesignator { 2190 /// Location of the first index expression within the designated 2191 /// initializer expression's list of subexpressions. 2192 unsigned Index; 2193 /// The location of the '[' starting the array range designator. 2194 unsigned LBracketLoc; 2195 /// The location of the ellipsis separating the start and end 2196 /// indices. Only valid for GNU array-range designators. 2197 unsigned EllipsisLoc; 2198 /// The location of the ']' terminating the array range designator. 2199 unsigned RBracketLoc; 2200 }; 2201 2202 /// @brief Represents a single C99 designator. 2203 /// 2204 /// @todo This class is infuriatingly similar to clang::Designator, 2205 /// but minor differences (storing indices vs. storing pointers) 2206 /// keep us from reusing it. Try harder, later, to rectify these 2207 /// differences. 2208 class Designator { 2209 /// @brief The kind of designator this describes. 2210 enum { 2211 FieldDesignator, 2212 ArrayDesignator, 2213 ArrayRangeDesignator 2214 } Kind; 2215 2216 union { 2217 /// A field designator, e.g., ".x". 2218 struct FieldDesignator Field; 2219 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2220 struct ArrayOrRangeDesignator ArrayOrRange; 2221 }; 2222 friend class DesignatedInitExpr; 2223 2224 public: 2225 Designator() {} 2226 2227 /// @brief Initializes a field designator. 2228 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2229 SourceLocation FieldLoc) 2230 : Kind(FieldDesignator) { 2231 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2232 Field.DotLoc = DotLoc.getRawEncoding(); 2233 Field.FieldLoc = FieldLoc.getRawEncoding(); 2234 } 2235 2236 /// @brief Initializes an array designator. 2237 Designator(unsigned Index, SourceLocation LBracketLoc, 2238 SourceLocation RBracketLoc) 2239 : Kind(ArrayDesignator) { 2240 ArrayOrRange.Index = Index; 2241 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2242 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2243 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2244 } 2245 2246 /// @brief Initializes a GNU array-range designator. 2247 Designator(unsigned Index, SourceLocation LBracketLoc, 2248 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2249 : Kind(ArrayRangeDesignator) { 2250 ArrayOrRange.Index = Index; 2251 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2252 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2253 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2254 } 2255 2256 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2257 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2258 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2259 2260 IdentifierInfo * getFieldName(); 2261 2262 FieldDecl *getField() { 2263 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2264 if (Field.NameOrField & 0x01) 2265 return 0; 2266 else 2267 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2268 } 2269 2270 void setField(FieldDecl *FD) { 2271 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2272 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2273 } 2274 2275 SourceLocation getDotLoc() const { 2276 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2277 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2278 } 2279 2280 SourceLocation getFieldLoc() const { 2281 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2282 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2283 } 2284 2285 SourceLocation getLBracketLoc() const { 2286 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2287 "Only valid on an array or array-range designator"); 2288 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2289 } 2290 2291 SourceLocation getRBracketLoc() const { 2292 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2293 "Only valid on an array or array-range designator"); 2294 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2295 } 2296 2297 SourceLocation getEllipsisLoc() const { 2298 assert(Kind == ArrayRangeDesignator && 2299 "Only valid on an array-range designator"); 2300 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2301 } 2302 2303 unsigned getFirstExprIndex() const { 2304 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2305 "Only valid on an array or array-range designator"); 2306 return ArrayOrRange.Index; 2307 } 2308 2309 SourceLocation getStartLocation() const { 2310 if (Kind == FieldDesignator) 2311 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2312 else 2313 return getLBracketLoc(); 2314 } 2315 }; 2316 2317 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2318 unsigned NumDesignators, 2319 Expr **IndexExprs, unsigned NumIndexExprs, 2320 SourceLocation EqualOrColonLoc, 2321 bool GNUSyntax, Expr *Init); 2322 2323 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2324 2325 /// @brief Returns the number of designators in this initializer. 2326 unsigned size() const { return NumDesignators; } 2327 2328 // Iterator access to the designators. 2329 typedef Designator* designators_iterator; 2330 designators_iterator designators_begin() { return Designators; } 2331 designators_iterator designators_end() { 2332 return Designators + NumDesignators; 2333 } 2334 2335 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2336 2337 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2338 2339 Expr *getArrayIndex(const Designator& D); 2340 Expr *getArrayRangeStart(const Designator& D); 2341 Expr *getArrayRangeEnd(const Designator& D); 2342 2343 /// @brief Retrieve the location of the '=' that precedes the 2344 /// initializer value itself, if present. 2345 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2346 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2347 2348 /// @brief Determines whether this designated initializer used the 2349 /// deprecated GNU syntax for designated initializers. 2350 bool usesGNUSyntax() const { return GNUSyntax; } 2351 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2352 2353 /// @brief Retrieve the initializer value. 2354 Expr *getInit() const { 2355 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2356 } 2357 2358 void setInit(Expr *init) { 2359 *child_begin() = init; 2360 } 2361 2362 /// \brief Retrieve the total number of subexpressions in this 2363 /// designated initializer expression, including the actual 2364 /// initialized value and any expressions that occur within array 2365 /// and array-range designators. 2366 unsigned getNumSubExprs() const { return NumSubExprs; } 2367 2368 Expr *getSubExpr(unsigned Idx) { 2369 assert(Idx < NumSubExprs && "Subscript out of range"); 2370 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2371 Ptr += sizeof(DesignatedInitExpr); 2372 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2373 } 2374 2375 void setSubExpr(unsigned Idx, Expr *E) { 2376 assert(Idx < NumSubExprs && "Subscript out of range"); 2377 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2378 Ptr += sizeof(DesignatedInitExpr); 2379 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2380 } 2381 2382 /// \brief Replaces the designator at index @p Idx with the series 2383 /// of designators in [First, Last). 2384 void ExpandDesignator(unsigned Idx, const Designator *First, 2385 const Designator *Last); 2386 2387 virtual SourceRange getSourceRange() const; 2388 2389 static bool classof(const Stmt *T) { 2390 return T->getStmtClass() == DesignatedInitExprClass; 2391 } 2392 static bool classof(const DesignatedInitExpr *) { return true; } 2393 2394 // Iterators 2395 virtual child_iterator child_begin(); 2396 virtual child_iterator child_end(); 2397}; 2398 2399/// \brief Represents an implicitly-generated value initialization of 2400/// an object of a given type. 2401/// 2402/// Implicit value initializations occur within semantic initializer 2403/// list expressions (InitListExpr) as placeholders for subobject 2404/// initializations not explicitly specified by the user. 2405/// 2406/// \see InitListExpr 2407class ImplicitValueInitExpr : public Expr { 2408public: 2409 explicit ImplicitValueInitExpr(QualType ty) 2410 : Expr(ImplicitValueInitExprClass, ty) { } 2411 2412 /// \brief Construct an empty implicit value initialization. 2413 explicit ImplicitValueInitExpr(EmptyShell Empty) 2414 : Expr(ImplicitValueInitExprClass, Empty) { } 2415 2416 static bool classof(const Stmt *T) { 2417 return T->getStmtClass() == ImplicitValueInitExprClass; 2418 } 2419 static bool classof(const ImplicitValueInitExpr *) { return true; } 2420 2421 virtual SourceRange getSourceRange() const { 2422 return SourceRange(); 2423 } 2424 2425 // Iterators 2426 virtual child_iterator child_begin(); 2427 virtual child_iterator child_end(); 2428}; 2429 2430 2431class ParenListExpr : public Expr { 2432 Stmt **Exprs; 2433 unsigned NumExprs; 2434 SourceLocation LParenLoc, RParenLoc; 2435 2436protected: 2437 virtual void DoDestroy(ASTContext& C); 2438 2439public: 2440 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2441 unsigned numexprs, SourceLocation rparenloc); 2442 2443 ~ParenListExpr() {} 2444 2445 /// \brief Build an empty paren list. 2446 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2447 2448 unsigned getNumExprs() const { return NumExprs; } 2449 2450 const Expr* getExpr(unsigned Init) const { 2451 assert(Init < getNumExprs() && "Initializer access out of range!"); 2452 return cast_or_null<Expr>(Exprs[Init]); 2453 } 2454 2455 Expr* getExpr(unsigned Init) { 2456 assert(Init < getNumExprs() && "Initializer access out of range!"); 2457 return cast_or_null<Expr>(Exprs[Init]); 2458 } 2459 2460 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2461 2462 SourceLocation getLParenLoc() const { return LParenLoc; } 2463 SourceLocation getRParenLoc() const { return RParenLoc; } 2464 2465 virtual SourceRange getSourceRange() const { 2466 return SourceRange(LParenLoc, RParenLoc); 2467 } 2468 static bool classof(const Stmt *T) { 2469 return T->getStmtClass() == ParenListExprClass; 2470 } 2471 static bool classof(const ParenListExpr *) { return true; } 2472 2473 // Iterators 2474 virtual child_iterator child_begin(); 2475 virtual child_iterator child_end(); 2476}; 2477 2478 2479//===----------------------------------------------------------------------===// 2480// Clang Extensions 2481//===----------------------------------------------------------------------===// 2482 2483 2484/// ExtVectorElementExpr - This represents access to specific elements of a 2485/// vector, and may occur on the left hand side or right hand side. For example 2486/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2487/// 2488/// Note that the base may have either vector or pointer to vector type, just 2489/// like a struct field reference. 2490/// 2491class ExtVectorElementExpr : public Expr { 2492 Stmt *Base; 2493 IdentifierInfo *Accessor; 2494 SourceLocation AccessorLoc; 2495public: 2496 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2497 SourceLocation loc) 2498 : Expr(ExtVectorElementExprClass, ty), 2499 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2500 2501 /// \brief Build an empty vector element expression. 2502 explicit ExtVectorElementExpr(EmptyShell Empty) 2503 : Expr(ExtVectorElementExprClass, Empty) { } 2504 2505 const Expr *getBase() const { return cast<Expr>(Base); } 2506 Expr *getBase() { return cast<Expr>(Base); } 2507 void setBase(Expr *E) { Base = E; } 2508 2509 IdentifierInfo &getAccessor() const { return *Accessor; } 2510 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2511 2512 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2513 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2514 2515 /// getNumElements - Get the number of components being selected. 2516 unsigned getNumElements() const; 2517 2518 /// containsDuplicateElements - Return true if any element access is 2519 /// repeated. 2520 bool containsDuplicateElements() const; 2521 2522 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2523 /// aggregate Constant of ConstantInt(s). 2524 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2525 2526 virtual SourceRange getSourceRange() const { 2527 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2528 } 2529 2530 /// isArrow - Return true if the base expression is a pointer to vector, 2531 /// return false if the base expression is a vector. 2532 bool isArrow() const; 2533 2534 static bool classof(const Stmt *T) { 2535 return T->getStmtClass() == ExtVectorElementExprClass; 2536 } 2537 static bool classof(const ExtVectorElementExpr *) { return true; } 2538 2539 // Iterators 2540 virtual child_iterator child_begin(); 2541 virtual child_iterator child_end(); 2542}; 2543 2544 2545/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2546/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2547class BlockExpr : public Expr { 2548protected: 2549 BlockDecl *TheBlock; 2550 bool HasBlockDeclRefExprs; 2551public: 2552 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2553 : Expr(BlockExprClass, ty), 2554 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2555 2556 /// \brief Build an empty block expression. 2557 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2558 2559 const BlockDecl *getBlockDecl() const { return TheBlock; } 2560 BlockDecl *getBlockDecl() { return TheBlock; } 2561 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2562 2563 // Convenience functions for probing the underlying BlockDecl. 2564 SourceLocation getCaretLocation() const; 2565 const Stmt *getBody() const; 2566 Stmt *getBody(); 2567 2568 virtual SourceRange getSourceRange() const { 2569 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2570 } 2571 2572 /// getFunctionType - Return the underlying function type for this block. 2573 const FunctionType *getFunctionType() const; 2574 2575 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2576 /// inside of the block that reference values outside the block. 2577 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2578 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2579 2580 static bool classof(const Stmt *T) { 2581 return T->getStmtClass() == BlockExprClass; 2582 } 2583 static bool classof(const BlockExpr *) { return true; } 2584 2585 // Iterators 2586 virtual child_iterator child_begin(); 2587 virtual child_iterator child_end(); 2588}; 2589 2590/// BlockDeclRefExpr - A reference to a declared variable, function, 2591/// enum, etc. 2592class BlockDeclRefExpr : public Expr { 2593 ValueDecl *D; 2594 SourceLocation Loc; 2595 bool IsByRef : 1; 2596 bool ConstQualAdded : 1; 2597public: 2598 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2599 bool constAdded = false) : 2600 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2601 ConstQualAdded(constAdded) {} 2602 2603 // \brief Build an empty reference to a declared variable in a 2604 // block. 2605 explicit BlockDeclRefExpr(EmptyShell Empty) 2606 : Expr(BlockDeclRefExprClass, Empty) { } 2607 2608 ValueDecl *getDecl() { return D; } 2609 const ValueDecl *getDecl() const { return D; } 2610 void setDecl(ValueDecl *VD) { D = VD; } 2611 2612 SourceLocation getLocation() const { return Loc; } 2613 void setLocation(SourceLocation L) { Loc = L; } 2614 2615 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2616 2617 bool isByRef() const { return IsByRef; } 2618 void setByRef(bool BR) { IsByRef = BR; } 2619 2620 bool isConstQualAdded() const { return ConstQualAdded; } 2621 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2622 2623 static bool classof(const Stmt *T) { 2624 return T->getStmtClass() == BlockDeclRefExprClass; 2625 } 2626 static bool classof(const BlockDeclRefExpr *) { return true; } 2627 2628 // Iterators 2629 virtual child_iterator child_begin(); 2630 virtual child_iterator child_end(); 2631}; 2632 2633} // end namespace clang 2634 2635#endif 2636