Expr.h revision a135fb43eb94524a6529768596a4533eed9aa70d
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 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66public: 67 QualType getType() const { return TR; } 68 void setType(QualType t) { 69 // In C++, the type of an expression is always adjusted so that it 70 // will not have reference type an expression will never have 71 // reference type (C++ [expr]p6). Use 72 // QualType::getNonReferenceType() to retrieve the non-reference 73 // type. Additionally, inspect Expr::isLvalue to determine whether 74 // an expression that is adjusted in this manner should be 75 // considered an lvalue. 76 assert((TR.isNull() || !TR->isReferenceType()) && 77 "Expressions can't have reference type"); 78 79 TR = t; 80 } 81 82 /// isValueDependent - Determines whether this expression is 83 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 84 /// array bound of "Chars" in the following example is 85 /// value-dependent. 86 /// @code 87 /// template<int Size, char (&Chars)[Size]> struct meta_string; 88 /// @endcode 89 bool isValueDependent() const { return ValueDependent; } 90 91 /// isTypeDependent - Determines whether this expression is 92 /// type-dependent (C++ [temp.dep.expr]), which means that its type 93 /// could change from one template instantiation to the next. For 94 /// example, the expressions "x" and "x + y" are type-dependent in 95 /// the following code, but "y" is not type-dependent: 96 /// @code 97 /// template<typename T> 98 /// void add(T x, int y) { 99 /// x + y; 100 /// } 101 /// @endcode 102 bool isTypeDependent() const { return TypeDependent; } 103 104 /// SourceLocation tokens are not useful in isolation - they are low level 105 /// value objects created/interpreted by SourceManager. We assume AST 106 /// clients will have a pointer to the respective SourceManager. 107 virtual SourceRange getSourceRange() const = 0; 108 109 /// getExprLoc - Return the preferred location for the arrow when diagnosing 110 /// a problem with a generic expression. 111 virtual SourceLocation getExprLoc() const { return getLocStart(); } 112 113 /// isUnusedResultAWarning - Return true if this immediate expression should 114 /// be warned about if the result is unused. If so, fill in Loc and Ranges 115 /// with location to warn on and the source range[s] to report with the 116 /// warning. 117 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 118 SourceRange &R2) const; 119 120 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 121 /// incomplete type other than void. Nonarray expressions that can be lvalues: 122 /// - name, where name must be a variable 123 /// - e[i] 124 /// - (e), where e must be an lvalue 125 /// - e.name, where e must be an lvalue 126 /// - e->name 127 /// - *e, the type of e cannot be a function type 128 /// - string-constant 129 /// - reference type [C++ [expr]] 130 /// 131 enum isLvalueResult { 132 LV_Valid, 133 LV_NotObjectType, 134 LV_IncompleteVoidType, 135 LV_DuplicateVectorComponents, 136 LV_InvalidExpression, 137 LV_MemberFunction 138 }; 139 isLvalueResult isLvalue(ASTContext &Ctx) const; 140 141 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 142 /// does not have an incomplete type, does not have a const-qualified type, 143 /// and if it is a structure or union, does not have any member (including, 144 /// recursively, any member or element of all contained aggregates or unions) 145 /// with a const-qualified type. 146 enum isModifiableLvalueResult { 147 MLV_Valid, 148 MLV_NotObjectType, 149 MLV_IncompleteVoidType, 150 MLV_DuplicateVectorComponents, 151 MLV_InvalidExpression, 152 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 153 MLV_IncompleteType, 154 MLV_ConstQualified, 155 MLV_ArrayType, 156 MLV_NotBlockQualified, 157 MLV_ReadonlyProperty, 158 MLV_NoSetterProperty, 159 MLV_MemberFunction 160 }; 161 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx) const; 162 163 bool isBitField(); 164 165 /// getIntegerConstantExprValue() - Return the value of an integer 166 /// constant expression. The expression must be a valid integer 167 /// constant expression as determined by isIntegerConstantExpr. 168 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 169 llvm::APSInt X; 170 bool success = isIntegerConstantExpr(X, Ctx); 171 success = success; 172 assert(success && "Illegal argument to getIntegerConstantExpr"); 173 return X; 174 } 175 176 /// isIntegerConstantExpr - Return true if this expression is a valid integer 177 /// constant expression, and, if so, return its value in Result. If not a 178 /// valid i-c-e, return false and fill in Loc (if specified) with the location 179 /// of the invalid expression. 180 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 181 SourceLocation *Loc = 0, 182 bool isEvaluated = true) const; 183 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 184 SourceLocation *Loc = 0, 185 bool isEvaluated = true) const; 186 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 187 llvm::APSInt X; 188 return isIntegerConstantExpr(X, Ctx, Loc); 189 } 190 /// isConstantInitializer - Returns true if this expression is a constant 191 /// initializer, which can be emitted at compile-time. 192 bool isConstantInitializer(ASTContext &Ctx) const; 193 194 /// EvalResult is a struct with detailed info about an evaluated expression. 195 struct EvalResult { 196 /// Val - This is the value the expression can be folded to. 197 APValue Val; 198 199 /// HasSideEffects - Whether the evaluated expression has side effects. 200 /// For example, (f() && 0) can be folded, but it still has side effects. 201 bool HasSideEffects; 202 203 /// Diag - If the expression is unfoldable, then Diag contains a note 204 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 205 /// position for the error, and DiagExpr is the expression that caused 206 /// the error. 207 /// If the expression is foldable, but not an integer constant expression, 208 /// Diag contains a note diagnostic that describes why it isn't an integer 209 /// constant expression. If the expression *is* an integer constant 210 /// expression, then Diag will be zero. 211 unsigned Diag; 212 const Expr *DiagExpr; 213 SourceLocation DiagLoc; 214 215 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 216 }; 217 218 /// Evaluate - Return true if this is a constant which we can fold using 219 /// any crazy technique (that has nothing to do with language standards) that 220 /// we want to. If this function returns true, it returns the folded constant 221 /// in Result. 222 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 223 224 /// isEvaluatable - Call Evaluate to see if this expression can be constant 225 /// folded, but discard the result. 226 bool isEvaluatable(ASTContext &Ctx) const; 227 228 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 229 /// must be called on an expression that constant folds to an integer. 230 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 231 232 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 233 /// integer constant expression with the value zero, or if this is one that is 234 /// cast to void*. 235 bool isNullPointerConstant(ASTContext &Ctx) const; 236 237 /// hasGlobalStorage - Return true if this expression has static storage 238 /// duration. This means that the address of this expression is a link-time 239 /// constant. 240 bool hasGlobalStorage() const; 241 242 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 243 /// write barrier. 244 bool isOBJCGCCandidate() const; 245 246 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 247 /// its subexpression. If that subexpression is also a ParenExpr, 248 /// then this method recursively returns its subexpression, and so forth. 249 /// Otherwise, the method returns the current Expr. 250 Expr* IgnoreParens(); 251 252 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 253 /// or CastExprs, returning their operand. 254 Expr *IgnoreParenCasts(); 255 256 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 257 /// value (including ptr->int casts of the same size). Strip off any 258 /// ParenExpr or CastExprs, returning their operand. 259 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 260 261 const Expr* IgnoreParens() const { 262 return const_cast<Expr*>(this)->IgnoreParens(); 263 } 264 const Expr *IgnoreParenCasts() const { 265 return const_cast<Expr*>(this)->IgnoreParenCasts(); 266 } 267 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 268 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 269 } 270 271 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 272 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 273 274 static bool classof(const Stmt *T) { 275 return T->getStmtClass() >= firstExprConstant && 276 T->getStmtClass() <= lastExprConstant; 277 } 278 static bool classof(const Expr *) { return true; } 279 280 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 281 return cast<Expr>(Stmt::Create(D, C)); 282 } 283}; 284 285 286//===----------------------------------------------------------------------===// 287// Primary Expressions. 288//===----------------------------------------------------------------------===// 289 290/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 291/// enum, etc. 292class DeclRefExpr : public Expr { 293 NamedDecl *D; 294 SourceLocation Loc; 295 296protected: 297 // FIXME: Eventually, this constructor will go away and all subclasses 298 // will have to provide the type- and value-dependent flags. 299 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 300 Expr(SC, t), D(d), Loc(l) {} 301 302 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 303 bool VD) : 304 Expr(SC, t, TD, VD), D(d), Loc(l) {} 305 306public: 307 // FIXME: Eventually, this constructor will go away and all clients 308 // will have to provide the type- and value-dependent flags. 309 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 310 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 311 312 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 313 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 314 315 NamedDecl *getDecl() { return D; } 316 const NamedDecl *getDecl() const { return D; } 317 void setDecl(NamedDecl *NewD) { D = NewD; } 318 319 SourceLocation getLocation() const { return Loc; } 320 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 321 322 static bool classof(const Stmt *T) { 323 return T->getStmtClass() == DeclRefExprClass || 324 T->getStmtClass() == CXXConditionDeclExprClass || 325 T->getStmtClass() == QualifiedDeclRefExprClass; 326 } 327 static bool classof(const DeclRefExpr *) { return true; } 328 329 // Iterators 330 virtual child_iterator child_begin(); 331 virtual child_iterator child_end(); 332 333 virtual void EmitImpl(llvm::Serializer& S) const; 334 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 335}; 336 337/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 338class PredefinedExpr : public Expr { 339public: 340 enum IdentType { 341 Func, 342 Function, 343 PrettyFunction 344 }; 345 346private: 347 SourceLocation Loc; 348 IdentType Type; 349public: 350 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 351 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 352 353 IdentType getIdentType() const { return Type; } 354 355 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 356 357 static bool classof(const Stmt *T) { 358 return T->getStmtClass() == PredefinedExprClass; 359 } 360 static bool classof(const PredefinedExpr *) { return true; } 361 362 // Iterators 363 virtual child_iterator child_begin(); 364 virtual child_iterator child_end(); 365 366 virtual void EmitImpl(llvm::Serializer& S) const; 367 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 368}; 369 370class IntegerLiteral : public Expr { 371 llvm::APInt Value; 372 SourceLocation Loc; 373public: 374 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 375 // or UnsignedLongLongTy 376 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 377 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 378 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 379 } 380 381 IntegerLiteral* Clone(ASTContext &C) const; 382 383 const llvm::APInt &getValue() const { return Value; } 384 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 385 386 /// \brief Retrieve the location of the literal. 387 SourceLocation getLocation() const { return Loc; } 388 389 static bool classof(const Stmt *T) { 390 return T->getStmtClass() == IntegerLiteralClass; 391 } 392 static bool classof(const IntegerLiteral *) { return true; } 393 394 // Iterators 395 virtual child_iterator child_begin(); 396 virtual child_iterator child_end(); 397 398 virtual void EmitImpl(llvm::Serializer& S) const; 399 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 400}; 401 402class CharacterLiteral : public Expr { 403 unsigned Value; 404 SourceLocation Loc; 405 bool IsWide; 406public: 407 // type should be IntTy 408 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 409 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 410 } 411 SourceLocation getLoc() const { return Loc; } 412 bool isWide() const { return IsWide; } 413 414 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 415 416 unsigned getValue() const { return Value; } 417 418 static bool classof(const Stmt *T) { 419 return T->getStmtClass() == CharacterLiteralClass; 420 } 421 static bool classof(const CharacterLiteral *) { return true; } 422 423 // Iterators 424 virtual child_iterator child_begin(); 425 virtual child_iterator child_end(); 426 427 virtual void EmitImpl(llvm::Serializer& S) const; 428 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 429}; 430 431class FloatingLiteral : public Expr { 432 llvm::APFloat Value; 433 bool IsExact : 1; 434 SourceLocation Loc; 435public: 436 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 437 QualType Type, SourceLocation L) 438 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 439 440 const llvm::APFloat &getValue() const { return Value; } 441 442 bool isExact() const { return IsExact; } 443 444 /// getValueAsApproximateDouble - This returns the value as an inaccurate 445 /// double. Note that this may cause loss of precision, but is useful for 446 /// debugging dumps, etc. 447 double getValueAsApproximateDouble() const; 448 449 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 450 451 static bool classof(const Stmt *T) { 452 return T->getStmtClass() == FloatingLiteralClass; 453 } 454 static bool classof(const FloatingLiteral *) { return true; } 455 456 // Iterators 457 virtual child_iterator child_begin(); 458 virtual child_iterator child_end(); 459 460 virtual void EmitImpl(llvm::Serializer& S) const; 461 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 462}; 463 464/// ImaginaryLiteral - We support imaginary integer and floating point literals, 465/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 466/// IntegerLiteral classes. Instances of this class always have a Complex type 467/// whose element type matches the subexpression. 468/// 469class ImaginaryLiteral : public Expr { 470 Stmt *Val; 471public: 472 ImaginaryLiteral(Expr *val, QualType Ty) 473 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 474 475 const Expr *getSubExpr() const { return cast<Expr>(Val); } 476 Expr *getSubExpr() { return cast<Expr>(Val); } 477 478 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 479 static bool classof(const Stmt *T) { 480 return T->getStmtClass() == ImaginaryLiteralClass; 481 } 482 static bool classof(const ImaginaryLiteral *) { return true; } 483 484 // Iterators 485 virtual child_iterator child_begin(); 486 virtual child_iterator child_end(); 487 488 virtual void EmitImpl(llvm::Serializer& S) const; 489 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 490}; 491 492/// StringLiteral - This represents a string literal expression, e.g. "foo" 493/// or L"bar" (wide strings). The actual string is returned by getStrData() 494/// is NOT null-terminated, and the length of the string is determined by 495/// calling getByteLength(). The C type for a string is always a 496/// ConstantArrayType. In C++, the char type is const qualified, in C it is 497/// not. 498/// 499/// Note that strings in C can be formed by concatenation of multiple string 500/// literal pptokens in translation phase #6. This keeps track of the locations 501/// of each of these pieces. 502/// 503/// Strings in C can also be truncated and extended by assigning into arrays, 504/// e.g. with constructs like: 505/// char X[2] = "foobar"; 506/// In this case, getByteLength() will return 6, but the string literal will 507/// have type "char[2]". 508class StringLiteral : public Expr { 509 const char *StrData; 510 unsigned ByteLength; 511 bool IsWide; 512 unsigned NumConcatenated; 513 SourceLocation TokLocs[1]; 514 515 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 516public: 517 /// This is the "fully general" constructor that allows representation of 518 /// strings formed from multiple concatenated tokens. 519 static StringLiteral *Create(ASTContext &C, const char *StrData, 520 unsigned ByteLength, bool Wide, QualType Ty, 521 const SourceLocation *Loc, unsigned NumStrs); 522 523 /// Simple constructor for string literals made from one token. 524 static StringLiteral *Create(ASTContext &C, const char *StrData, 525 unsigned ByteLength, 526 bool Wide, QualType Ty, SourceLocation Loc) { 527 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 528 } 529 530 StringLiteral* Clone(ASTContext &C) const; 531 void Destroy(ASTContext &C); 532 533 const char *getStrData() const { return StrData; } 534 unsigned getByteLength() const { return ByteLength; } 535 bool isWide() const { return IsWide; } 536 537 /// getNumConcatenated - Get the number of string literal tokens that were 538 /// concatenated in translation phase #6 to form this string literal. 539 unsigned getNumConcatenated() const { return NumConcatenated; } 540 541 SourceLocation getStrTokenLoc(unsigned TokNum) const { 542 assert(TokNum < NumConcatenated && "Invalid tok number"); 543 return TokLocs[TokNum]; 544 } 545 546 typedef const SourceLocation *tokloc_iterator; 547 tokloc_iterator tokloc_begin() const { return TokLocs; } 548 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 549 550 virtual SourceRange getSourceRange() const { 551 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 552 } 553 static bool classof(const Stmt *T) { 554 return T->getStmtClass() == StringLiteralClass; 555 } 556 static bool classof(const StringLiteral *) { return true; } 557 558 // Iterators 559 virtual child_iterator child_begin(); 560 virtual child_iterator child_end(); 561 562 virtual void EmitImpl(llvm::Serializer& S) const; 563 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 564}; 565 566/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 567/// AST node is only formed if full location information is requested. 568class ParenExpr : public Expr { 569 SourceLocation L, R; 570 Stmt *Val; 571public: 572 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 573 : Expr(ParenExprClass, val->getType(), 574 val->isTypeDependent(), val->isValueDependent()), 575 L(l), R(r), Val(val) {} 576 577 const Expr *getSubExpr() const { return cast<Expr>(Val); } 578 Expr *getSubExpr() { return cast<Expr>(Val); } 579 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 580 581 /// \brief Get the location of the left parentheses '('. 582 SourceLocation getLParen() const { return L; } 583 584 /// \brief Get the location of the right parentheses ')'. 585 SourceLocation getRParen() const { return R; } 586 587 static bool classof(const Stmt *T) { 588 return T->getStmtClass() == ParenExprClass; 589 } 590 static bool classof(const ParenExpr *) { return true; } 591 592 // Iterators 593 virtual child_iterator child_begin(); 594 virtual child_iterator child_end(); 595 596 virtual void EmitImpl(llvm::Serializer& S) const; 597 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 598}; 599 600 601/// UnaryOperator - This represents the unary-expression's (except sizeof and 602/// alignof), the postinc/postdec operators from postfix-expression, and various 603/// extensions. 604/// 605/// Notes on various nodes: 606/// 607/// Real/Imag - These return the real/imag part of a complex operand. If 608/// applied to a non-complex value, the former returns its operand and the 609/// later returns zero in the type of the operand. 610/// 611/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 612/// subexpression is a compound literal with the various MemberExpr and 613/// ArraySubscriptExpr's applied to it. 614/// 615class UnaryOperator : public Expr { 616public: 617 // Note that additions to this should also update the StmtVisitor class. 618 enum Opcode { 619 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 620 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 621 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 622 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 623 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 624 Real, Imag, // "__real expr"/"__imag expr" Extension. 625 Extension, // __extension__ marker. 626 OffsetOf // __builtin_offsetof 627 }; 628private: 629 Stmt *Val; 630 Opcode Opc; 631 SourceLocation Loc; 632public: 633 634 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 635 : Expr(UnaryOperatorClass, type, 636 input->isTypeDependent() && opc != OffsetOf, 637 input->isValueDependent()), 638 Val(input), Opc(opc), Loc(l) {} 639 640 Opcode getOpcode() const { return Opc; } 641 Expr *getSubExpr() const { return cast<Expr>(Val); } 642 643 /// getOperatorLoc - Return the location of the operator. 644 SourceLocation getOperatorLoc() const { return Loc; } 645 646 /// isPostfix - Return true if this is a postfix operation, like x++. 647 static bool isPostfix(Opcode Op) { 648 return Op == PostInc || Op == PostDec; 649 } 650 651 /// isPostfix - Return true if this is a prefix operation, like --x. 652 static bool isPrefix(Opcode Op) { 653 return Op == PreInc || Op == PreDec; 654 } 655 656 bool isPrefix() const { return isPrefix(Opc); } 657 bool isPostfix() const { return isPostfix(Opc); } 658 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 659 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 660 bool isOffsetOfOp() const { return Opc == OffsetOf; } 661 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 662 663 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 664 /// corresponds to, e.g. "sizeof" or "[pre]++" 665 static const char *getOpcodeStr(Opcode Op); 666 667 /// \brief Retrieve the unary opcode that corresponds to the given 668 /// overloaded operator. 669 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 670 671 /// \brief Retrieve the overloaded operator kind that corresponds to 672 /// the given unary opcode. 673 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 674 675 virtual SourceRange getSourceRange() const { 676 if (isPostfix()) 677 return SourceRange(Val->getLocStart(), Loc); 678 else 679 return SourceRange(Loc, Val->getLocEnd()); 680 } 681 virtual SourceLocation getExprLoc() const { return Loc; } 682 683 static bool classof(const Stmt *T) { 684 return T->getStmtClass() == UnaryOperatorClass; 685 } 686 static bool classof(const UnaryOperator *) { return true; } 687 688 // Iterators 689 virtual child_iterator child_begin(); 690 virtual child_iterator child_end(); 691 692 virtual void EmitImpl(llvm::Serializer& S) const; 693 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 694}; 695 696/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 697/// types and expressions. 698class SizeOfAlignOfExpr : public Expr { 699 bool isSizeof : 1; // true if sizeof, false if alignof. 700 bool isType : 1; // true if operand is a type, false if an expression 701 union { 702 void *Ty; 703 Stmt *Ex; 704 } Argument; 705 SourceLocation OpLoc, RParenLoc; 706public: 707 SizeOfAlignOfExpr(bool issizeof, QualType T, 708 QualType resultType, SourceLocation op, 709 SourceLocation rp) : 710 Expr(SizeOfAlignOfExprClass, resultType, 711 false, // Never type-dependent (C++ [temp.dep.expr]p3). 712 // Value-dependent if the argument is type-dependent. 713 T->isDependentType()), 714 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 715 Argument.Ty = T.getAsOpaquePtr(); 716 } 717 718 SizeOfAlignOfExpr(bool issizeof, Expr *E, 719 QualType resultType, SourceLocation op, 720 SourceLocation rp) : 721 Expr(SizeOfAlignOfExprClass, resultType, 722 false, // Never type-dependent (C++ [temp.dep.expr]p3). 723 // Value-dependent if the argument is type-dependent. 724 E->isTypeDependent()), 725 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 726 Argument.Ex = E; 727 } 728 729 virtual void Destroy(ASTContext& C); 730 731 bool isSizeOf() const { return isSizeof; } 732 bool isArgumentType() const { return isType; } 733 QualType getArgumentType() const { 734 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 735 return QualType::getFromOpaquePtr(Argument.Ty); 736 } 737 Expr *getArgumentExpr() { 738 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 739 return static_cast<Expr*>(Argument.Ex); 740 } 741 const Expr *getArgumentExpr() const { 742 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 743 } 744 745 /// Gets the argument type, or the type of the argument expression, whichever 746 /// is appropriate. 747 QualType getTypeOfArgument() const { 748 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 749 } 750 751 SourceLocation getOperatorLoc() const { return OpLoc; } 752 753 virtual SourceRange getSourceRange() const { 754 return SourceRange(OpLoc, RParenLoc); 755 } 756 757 static bool classof(const Stmt *T) { 758 return T->getStmtClass() == SizeOfAlignOfExprClass; 759 } 760 static bool classof(const SizeOfAlignOfExpr *) { return true; } 761 762 // Iterators 763 virtual child_iterator child_begin(); 764 virtual child_iterator child_end(); 765 766 virtual void EmitImpl(llvm::Serializer& S) const; 767 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 768}; 769 770//===----------------------------------------------------------------------===// 771// Postfix Operators. 772//===----------------------------------------------------------------------===// 773 774/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 775class ArraySubscriptExpr : public Expr { 776 enum { LHS, RHS, END_EXPR=2 }; 777 Stmt* SubExprs[END_EXPR]; 778 SourceLocation RBracketLoc; 779public: 780 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 781 SourceLocation rbracketloc) 782 : Expr(ArraySubscriptExprClass, t, 783 lhs->isTypeDependent() || rhs->isTypeDependent(), 784 lhs->isValueDependent() || rhs->isValueDependent()), 785 RBracketLoc(rbracketloc) { 786 SubExprs[LHS] = lhs; 787 SubExprs[RHS] = rhs; 788 } 789 790 /// An array access can be written A[4] or 4[A] (both are equivalent). 791 /// - getBase() and getIdx() always present the normalized view: A[4]. 792 /// In this case getBase() returns "A" and getIdx() returns "4". 793 /// - getLHS() and getRHS() present the syntactic view. e.g. for 794 /// 4[A] getLHS() returns "4". 795 /// Note: Because vector element access is also written A[4] we must 796 /// predicate the format conversion in getBase and getIdx only on the 797 /// the type of the RHS, as it is possible for the LHS to be a vector of 798 /// integer type 799 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 800 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 801 802 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 803 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 804 805 Expr *getBase() { 806 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 807 } 808 809 const Expr *getBase() const { 810 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 811 } 812 813 Expr *getIdx() { 814 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 815 } 816 817 const Expr *getIdx() const { 818 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 819 } 820 821 virtual SourceRange getSourceRange() const { 822 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 823 } 824 825 SourceLocation getRBracketLoc() const { return RBracketLoc; } 826 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 827 828 static bool classof(const Stmt *T) { 829 return T->getStmtClass() == ArraySubscriptExprClass; 830 } 831 static bool classof(const ArraySubscriptExpr *) { return true; } 832 833 // Iterators 834 virtual child_iterator child_begin(); 835 virtual child_iterator child_end(); 836 837 virtual void EmitImpl(llvm::Serializer& S) const; 838 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 839}; 840 841 842/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 843/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 844/// while its subclasses may represent alternative syntax that (semantically) 845/// results in a function call. For example, CXXOperatorCallExpr is 846/// a subclass for overloaded operator calls that use operator syntax, e.g., 847/// "str1 + str2" to resolve to a function call. 848class CallExpr : public Expr { 849 enum { FN=0, ARGS_START=1 }; 850 Stmt **SubExprs; 851 unsigned NumArgs; 852 SourceLocation RParenLoc; 853 854 // This version of the ctor is for deserialization. 855 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 856 SourceLocation rparenloc) 857 : Expr(SC,t), SubExprs(subexprs), 858 NumArgs(numargs), RParenLoc(rparenloc) {} 859 860protected: 861 // This version of the constructor is for derived classes. 862 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 863 QualType t, SourceLocation rparenloc); 864 865public: 866 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 867 SourceLocation rparenloc); 868 869 ~CallExpr() {} 870 871 void Destroy(ASTContext& C); 872 873 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 874 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 875 void setCallee(Expr *F) { SubExprs[FN] = F; } 876 877 /// getNumArgs - Return the number of actual arguments to this call. 878 /// 879 unsigned getNumArgs() const { return NumArgs; } 880 881 /// getArg - Return the specified argument. 882 Expr *getArg(unsigned Arg) { 883 assert(Arg < NumArgs && "Arg access out of range!"); 884 return cast<Expr>(SubExprs[Arg+ARGS_START]); 885 } 886 const Expr *getArg(unsigned Arg) const { 887 assert(Arg < NumArgs && "Arg access out of range!"); 888 return cast<Expr>(SubExprs[Arg+ARGS_START]); 889 } 890 891 // FIXME: Why is this needed? Why not just create the CallExpr with the 892 // corect number of arguments? It makes the ASTs less brittle. 893 /// setArg - Set the specified argument. 894 void setArg(unsigned Arg, Expr *ArgExpr) { 895 assert(Arg < NumArgs && "Arg access out of range!"); 896 SubExprs[Arg+ARGS_START] = ArgExpr; 897 } 898 899 // FIXME: It would be great to just get rid of this. There is only one 900 // callee of this method, and it probably could be refactored to not use 901 // this method and instead just create a CallExpr with the right number of 902 // arguments. 903 /// setNumArgs - This changes the number of arguments present in this call. 904 /// Any orphaned expressions are deleted by this, and any new operands are set 905 /// to null. 906 void setNumArgs(ASTContext& C, unsigned NumArgs); 907 908 typedef ExprIterator arg_iterator; 909 typedef ConstExprIterator const_arg_iterator; 910 911 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 912 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 913 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 914 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 915 916 /// getNumCommas - Return the number of commas that must have been present in 917 /// this function call. 918 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 919 920 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 921 /// not, return 0. 922 unsigned isBuiltinCall(ASTContext &Context) const; 923 924 SourceLocation getRParenLoc() const { return RParenLoc; } 925 926 virtual SourceRange getSourceRange() const { 927 return SourceRange(getCallee()->getLocStart(), RParenLoc); 928 } 929 930 static bool classof(const Stmt *T) { 931 return T->getStmtClass() == CallExprClass || 932 T->getStmtClass() == CXXOperatorCallExprClass || 933 T->getStmtClass() == CXXMemberCallExprClass; 934 } 935 static bool classof(const CallExpr *) { return true; } 936 static bool classof(const CXXOperatorCallExpr *) { return true; } 937 static bool classof(const CXXMemberCallExpr *) { return true; } 938 939 // Iterators 940 virtual child_iterator child_begin(); 941 virtual child_iterator child_end(); 942 943 virtual void EmitImpl(llvm::Serializer& S) const; 944 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 945 StmtClass SC); 946}; 947 948/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 949/// 950class MemberExpr : public Expr { 951 /// Base - the expression for the base pointer or structure references. In 952 /// X.F, this is "X". 953 Stmt *Base; 954 955 /// MemberDecl - This is the decl being referenced by the field/member name. 956 /// In X.F, this is the decl referenced by F. 957 NamedDecl *MemberDecl; 958 959 /// MemberLoc - This is the location of the member name. 960 SourceLocation MemberLoc; 961 962 /// IsArrow - True if this is "X->F", false if this is "X.F". 963 bool IsArrow; 964public: 965 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 966 QualType ty) 967 : Expr(MemberExprClass, ty), 968 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 969 970 void setBase(Expr *E) { Base = E; } 971 Expr *getBase() const { return cast<Expr>(Base); } 972 NamedDecl *getMemberDecl() const { return MemberDecl; } 973 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 974 bool isArrow() const { return IsArrow; } 975 976 /// getMemberLoc - Return the location of the "member", in X->F, it is the 977 /// location of 'F'. 978 SourceLocation getMemberLoc() const { return MemberLoc; } 979 980 virtual SourceRange getSourceRange() const { 981 return SourceRange(getBase()->getLocStart(), MemberLoc); 982 } 983 984 virtual SourceLocation getExprLoc() const { return MemberLoc; } 985 986 static bool classof(const Stmt *T) { 987 return T->getStmtClass() == MemberExprClass; 988 } 989 static bool classof(const MemberExpr *) { return true; } 990 991 // Iterators 992 virtual child_iterator child_begin(); 993 virtual child_iterator child_end(); 994 995 virtual void EmitImpl(llvm::Serializer& S) const; 996 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 997}; 998 999/// CompoundLiteralExpr - [C99 6.5.2.5] 1000/// 1001class CompoundLiteralExpr : public Expr { 1002 /// LParenLoc - If non-null, this is the location of the left paren in a 1003 /// compound literal like "(int){4}". This can be null if this is a 1004 /// synthesized compound expression. 1005 SourceLocation LParenLoc; 1006 Stmt *Init; 1007 bool FileScope; 1008public: 1009 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1010 bool fileScope) 1011 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1012 FileScope(fileScope) {} 1013 1014 const Expr *getInitializer() const { return cast<Expr>(Init); } 1015 Expr *getInitializer() { return cast<Expr>(Init); } 1016 1017 bool isFileScope() const { return FileScope; } 1018 1019 SourceLocation getLParenLoc() const { return LParenLoc; } 1020 1021 virtual SourceRange getSourceRange() const { 1022 // FIXME: Init should never be null. 1023 if (!Init) 1024 return SourceRange(); 1025 if (LParenLoc.isInvalid()) 1026 return Init->getSourceRange(); 1027 return SourceRange(LParenLoc, Init->getLocEnd()); 1028 } 1029 1030 static bool classof(const Stmt *T) { 1031 return T->getStmtClass() == CompoundLiteralExprClass; 1032 } 1033 static bool classof(const CompoundLiteralExpr *) { return true; } 1034 1035 // Iterators 1036 virtual child_iterator child_begin(); 1037 virtual child_iterator child_end(); 1038 1039 virtual void EmitImpl(llvm::Serializer& S) const; 1040 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1041}; 1042 1043/// CastExpr - Base class for type casts, including both implicit 1044/// casts (ImplicitCastExpr) and explicit casts that have some 1045/// representation in the source code (ExplicitCastExpr's derived 1046/// classes). 1047class CastExpr : public Expr { 1048 Stmt *Op; 1049protected: 1050 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1051 Expr(SC, ty, 1052 // Cast expressions are type-dependent if the type is 1053 // dependent (C++ [temp.dep.expr]p3). 1054 ty->isDependentType(), 1055 // Cast expressions are value-dependent if the type is 1056 // dependent or if the subexpression is value-dependent. 1057 ty->isDependentType() || (op && op->isValueDependent())), 1058 Op(op) {} 1059 1060public: 1061 Expr *getSubExpr() { return cast<Expr>(Op); } 1062 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1063 1064 static bool classof(const Stmt *T) { 1065 StmtClass SC = T->getStmtClass(); 1066 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1067 return true; 1068 1069 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1070 return true; 1071 1072 return false; 1073 } 1074 static bool classof(const CastExpr *) { return true; } 1075 1076 // Iterators 1077 virtual child_iterator child_begin(); 1078 virtual child_iterator child_end(); 1079}; 1080 1081/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1082/// conversions, which have no direct representation in the original 1083/// source code. For example: converting T[]->T*, void f()->void 1084/// (*f)(), float->double, short->int, etc. 1085/// 1086/// In C, implicit casts always produce rvalues. However, in C++, an 1087/// implicit cast whose result is being bound to a reference will be 1088/// an lvalue. For example: 1089/// 1090/// @code 1091/// class Base { }; 1092/// class Derived : public Base { }; 1093/// void f(Derived d) { 1094/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1095/// } 1096/// @endcode 1097class ImplicitCastExpr : public CastExpr { 1098 /// LvalueCast - Whether this cast produces an lvalue. 1099 bool LvalueCast; 1100 1101public: 1102 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1103 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1104 1105 virtual SourceRange getSourceRange() const { 1106 return getSubExpr()->getSourceRange(); 1107 } 1108 1109 /// isLvalueCast - Whether this cast produces an lvalue. 1110 bool isLvalueCast() const { return LvalueCast; } 1111 1112 /// setLvalueCast - Set whether this cast produces an lvalue. 1113 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1114 1115 static bool classof(const Stmt *T) { 1116 return T->getStmtClass() == ImplicitCastExprClass; 1117 } 1118 static bool classof(const ImplicitCastExpr *) { return true; } 1119 1120 virtual void EmitImpl(llvm::Serializer& S) const; 1121 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1122}; 1123 1124/// ExplicitCastExpr - An explicit cast written in the source 1125/// code. 1126/// 1127/// This class is effectively an abstract class, because it provides 1128/// the basic representation of an explicitly-written cast without 1129/// specifying which kind of cast (C cast, functional cast, static 1130/// cast, etc.) was written; specific derived classes represent the 1131/// particular style of cast and its location information. 1132/// 1133/// Unlike implicit casts, explicit cast nodes have two different 1134/// types: the type that was written into the source code, and the 1135/// actual type of the expression as determined by semantic 1136/// analysis. These types may differ slightly. For example, in C++ one 1137/// can cast to a reference type, which indicates that the resulting 1138/// expression will be an lvalue. The reference type, however, will 1139/// not be used as the type of the expression. 1140class ExplicitCastExpr : public CastExpr { 1141 /// TypeAsWritten - The type that this expression is casting to, as 1142 /// written in the source code. 1143 QualType TypeAsWritten; 1144 1145protected: 1146 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1147 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1148 1149public: 1150 /// getTypeAsWritten - Returns the type that this expression is 1151 /// casting to, as written in the source code. 1152 QualType getTypeAsWritten() const { return TypeAsWritten; } 1153 1154 static bool classof(const Stmt *T) { 1155 StmtClass SC = T->getStmtClass(); 1156 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1157 return true; 1158 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1159 return true; 1160 1161 return false; 1162 } 1163 static bool classof(const ExplicitCastExpr *) { return true; } 1164}; 1165 1166/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1167/// cast in C++ (C++ [expr.cast]), which uses the syntax 1168/// (Type)expr. For example: @c (int)f. 1169class CStyleCastExpr : public ExplicitCastExpr { 1170 SourceLocation LPLoc; // the location of the left paren 1171 SourceLocation RPLoc; // the location of the right paren 1172public: 1173 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1174 SourceLocation l, SourceLocation r) : 1175 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1176 LPLoc(l), RPLoc(r) {} 1177 1178 SourceLocation getLParenLoc() const { return LPLoc; } 1179 SourceLocation getRParenLoc() const { return RPLoc; } 1180 1181 virtual SourceRange getSourceRange() const { 1182 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1183 } 1184 static bool classof(const Stmt *T) { 1185 return T->getStmtClass() == CStyleCastExprClass; 1186 } 1187 static bool classof(const CStyleCastExpr *) { return true; } 1188 1189 virtual void EmitImpl(llvm::Serializer& S) const; 1190 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1191}; 1192 1193/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1194/// 1195/// This expression node kind describes a builtin binary operation, 1196/// such as "x + y" for integer values "x" and "y". The operands will 1197/// already have been converted to appropriate types (e.g., by 1198/// performing promotions or conversions). 1199/// 1200/// In C++, where operators may be overloaded, a different kind of 1201/// expression node (CXXOperatorCallExpr) is used to express the 1202/// invocation of an overloaded operator with operator syntax. Within 1203/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1204/// used to store an expression "x + y" depends on the subexpressions 1205/// for x and y. If neither x or y is type-dependent, and the "+" 1206/// operator resolves to a built-in operation, BinaryOperator will be 1207/// used to express the computation (x and y may still be 1208/// value-dependent). If either x or y is type-dependent, or if the 1209/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1210/// be used to express the computation. 1211class BinaryOperator : public Expr { 1212public: 1213 enum Opcode { 1214 // Operators listed in order of precedence. 1215 // Note that additions to this should also update the StmtVisitor class. 1216 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1217 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1218 Add, Sub, // [C99 6.5.6] Additive operators. 1219 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1220 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1221 EQ, NE, // [C99 6.5.9] Equality operators. 1222 And, // [C99 6.5.10] Bitwise AND operator. 1223 Xor, // [C99 6.5.11] Bitwise XOR operator. 1224 Or, // [C99 6.5.12] Bitwise OR operator. 1225 LAnd, // [C99 6.5.13] Logical AND operator. 1226 LOr, // [C99 6.5.14] Logical OR operator. 1227 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1228 DivAssign, RemAssign, 1229 AddAssign, SubAssign, 1230 ShlAssign, ShrAssign, 1231 AndAssign, XorAssign, 1232 OrAssign, 1233 Comma // [C99 6.5.17] Comma operator. 1234 }; 1235private: 1236 enum { LHS, RHS, END_EXPR }; 1237 Stmt* SubExprs[END_EXPR]; 1238 Opcode Opc; 1239 SourceLocation OpLoc; 1240public: 1241 1242 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1243 SourceLocation opLoc) 1244 : Expr(BinaryOperatorClass, ResTy, 1245 lhs->isTypeDependent() || rhs->isTypeDependent(), 1246 lhs->isValueDependent() || rhs->isValueDependent()), 1247 Opc(opc), OpLoc(opLoc) { 1248 SubExprs[LHS] = lhs; 1249 SubExprs[RHS] = rhs; 1250 assert(!isCompoundAssignmentOp() && 1251 "Use ArithAssignBinaryOperator for compound assignments"); 1252 } 1253 1254 SourceLocation getOperatorLoc() const { return OpLoc; } 1255 Opcode getOpcode() const { return Opc; } 1256 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1257 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1258 virtual SourceRange getSourceRange() const { 1259 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1260 } 1261 1262 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1263 /// corresponds to, e.g. "<<=". 1264 static const char *getOpcodeStr(Opcode Op); 1265 1266 /// \brief Retrieve the binary opcode that corresponds to the given 1267 /// overloaded operator. 1268 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1269 1270 /// \brief Retrieve the overloaded operator kind that corresponds to 1271 /// the given binary opcode. 1272 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1273 1274 /// predicates to categorize the respective opcodes. 1275 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1276 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1277 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1278 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1279 1280 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1281 bool isRelationalOp() const { return isRelationalOp(Opc); } 1282 1283 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1284 bool isEqualityOp() const { return isEqualityOp(Opc); } 1285 1286 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1287 bool isLogicalOp() const { return isLogicalOp(Opc); } 1288 1289 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1290 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1291 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1292 1293 static bool classof(const Stmt *S) { 1294 return S->getStmtClass() == BinaryOperatorClass || 1295 S->getStmtClass() == CompoundAssignOperatorClass; 1296 } 1297 static bool classof(const BinaryOperator *) { return true; } 1298 1299 // Iterators 1300 virtual child_iterator child_begin(); 1301 virtual child_iterator child_end(); 1302 1303 virtual void EmitImpl(llvm::Serializer& S) const; 1304 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1305 1306protected: 1307 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1308 SourceLocation oploc, bool dead) 1309 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1310 SubExprs[LHS] = lhs; 1311 SubExprs[RHS] = rhs; 1312 } 1313}; 1314 1315/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1316/// track of the type the operation is performed in. Due to the semantics of 1317/// these operators, the operands are promoted, the aritmetic performed, an 1318/// implicit conversion back to the result type done, then the assignment takes 1319/// place. This captures the intermediate type which the computation is done 1320/// in. 1321class CompoundAssignOperator : public BinaryOperator { 1322 QualType ComputationType; 1323public: 1324 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1325 QualType ResType, QualType CompType, 1326 SourceLocation OpLoc) 1327 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1328 ComputationType(CompType) { 1329 assert(isCompoundAssignmentOp() && 1330 "Only should be used for compound assignments"); 1331 } 1332 1333 QualType getComputationType() const { return ComputationType; } 1334 1335 static bool classof(const CompoundAssignOperator *) { return true; } 1336 static bool classof(const Stmt *S) { 1337 return S->getStmtClass() == CompoundAssignOperatorClass; 1338 } 1339 1340 virtual void EmitImpl(llvm::Serializer& S) const; 1341 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1342 ASTContext& C); 1343}; 1344 1345/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1346/// GNU "missing LHS" extension is in use. 1347/// 1348class ConditionalOperator : public Expr { 1349 enum { COND, LHS, RHS, END_EXPR }; 1350 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1351public: 1352 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1353 : Expr(ConditionalOperatorClass, t, 1354 // FIXME: the type of the conditional operator doesn't 1355 // depend on the type of the conditional, but the standard 1356 // seems to imply that it could. File a bug! 1357 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1358 (cond->isValueDependent() || 1359 (lhs && lhs->isValueDependent()) || 1360 (rhs && rhs->isValueDependent()))) { 1361 SubExprs[COND] = cond; 1362 SubExprs[LHS] = lhs; 1363 SubExprs[RHS] = rhs; 1364 } 1365 1366 // getCond - Return the expression representing the condition for 1367 // the ?: operator. 1368 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1369 1370 // getTrueExpr - Return the subexpression representing the value of the ?: 1371 // expression if the condition evaluates to true. In most cases this value 1372 // will be the same as getLHS() except a GCC extension allows the left 1373 // subexpression to be omitted, and instead of the condition be returned. 1374 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1375 // is only evaluated once. 1376 Expr *getTrueExpr() const { 1377 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1378 } 1379 1380 // getTrueExpr - Return the subexpression representing the value of the ?: 1381 // expression if the condition evaluates to false. This is the same as getRHS. 1382 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1383 1384 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1385 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1386 1387 virtual SourceRange getSourceRange() const { 1388 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1389 } 1390 static bool classof(const Stmt *T) { 1391 return T->getStmtClass() == ConditionalOperatorClass; 1392 } 1393 static bool classof(const ConditionalOperator *) { return true; } 1394 1395 // Iterators 1396 virtual child_iterator child_begin(); 1397 virtual child_iterator child_end(); 1398 1399 virtual void EmitImpl(llvm::Serializer& S) const; 1400 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1401}; 1402 1403/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1404class AddrLabelExpr : public Expr { 1405 SourceLocation AmpAmpLoc, LabelLoc; 1406 LabelStmt *Label; 1407public: 1408 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1409 QualType t) 1410 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1411 1412 virtual SourceRange getSourceRange() const { 1413 return SourceRange(AmpAmpLoc, LabelLoc); 1414 } 1415 1416 LabelStmt *getLabel() const { return Label; } 1417 1418 static bool classof(const Stmt *T) { 1419 return T->getStmtClass() == AddrLabelExprClass; 1420 } 1421 static bool classof(const AddrLabelExpr *) { return true; } 1422 1423 // Iterators 1424 virtual child_iterator child_begin(); 1425 virtual child_iterator child_end(); 1426 1427 virtual void EmitImpl(llvm::Serializer& S) const; 1428 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1429}; 1430 1431/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1432/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1433/// takes the value of the last subexpression. 1434class StmtExpr : public Expr { 1435 Stmt *SubStmt; 1436 SourceLocation LParenLoc, RParenLoc; 1437public: 1438 StmtExpr(CompoundStmt *substmt, QualType T, 1439 SourceLocation lp, SourceLocation rp) : 1440 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1441 1442 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1443 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1444 1445 virtual SourceRange getSourceRange() const { 1446 return SourceRange(LParenLoc, RParenLoc); 1447 } 1448 1449 SourceLocation getLParenLoc() const { return LParenLoc; } 1450 SourceLocation getRParenLoc() const { return RParenLoc; } 1451 1452 static bool classof(const Stmt *T) { 1453 return T->getStmtClass() == StmtExprClass; 1454 } 1455 static bool classof(const StmtExpr *) { return true; } 1456 1457 // Iterators 1458 virtual child_iterator child_begin(); 1459 virtual child_iterator child_end(); 1460 1461 virtual void EmitImpl(llvm::Serializer& S) const; 1462 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1463}; 1464 1465/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1466/// This AST node represents a function that returns 1 if two *types* (not 1467/// expressions) are compatible. The result of this built-in function can be 1468/// used in integer constant expressions. 1469class TypesCompatibleExpr : public Expr { 1470 QualType Type1; 1471 QualType Type2; 1472 SourceLocation BuiltinLoc, RParenLoc; 1473public: 1474 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1475 QualType t1, QualType t2, SourceLocation RP) : 1476 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1477 BuiltinLoc(BLoc), RParenLoc(RP) {} 1478 1479 QualType getArgType1() const { return Type1; } 1480 QualType getArgType2() const { return Type2; } 1481 1482 virtual SourceRange getSourceRange() const { 1483 return SourceRange(BuiltinLoc, RParenLoc); 1484 } 1485 static bool classof(const Stmt *T) { 1486 return T->getStmtClass() == TypesCompatibleExprClass; 1487 } 1488 static bool classof(const TypesCompatibleExpr *) { return true; } 1489 1490 // Iterators 1491 virtual child_iterator child_begin(); 1492 virtual child_iterator child_end(); 1493 1494 virtual void EmitImpl(llvm::Serializer& S) const; 1495 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1496}; 1497 1498/// ShuffleVectorExpr - clang-specific builtin-in function 1499/// __builtin_shufflevector. 1500/// This AST node represents a operator that does a constant 1501/// shuffle, similar to LLVM's shufflevector instruction. It takes 1502/// two vectors and a variable number of constant indices, 1503/// and returns the appropriately shuffled vector. 1504class ShuffleVectorExpr : public Expr { 1505 SourceLocation BuiltinLoc, RParenLoc; 1506 1507 // SubExprs - the list of values passed to the __builtin_shufflevector 1508 // function. The first two are vectors, and the rest are constant 1509 // indices. The number of values in this list is always 1510 // 2+the number of indices in the vector type. 1511 Stmt **SubExprs; 1512 unsigned NumExprs; 1513 1514public: 1515 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1516 QualType Type, SourceLocation BLoc, 1517 SourceLocation RP) : 1518 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1519 RParenLoc(RP), NumExprs(nexpr) { 1520 1521 SubExprs = new Stmt*[nexpr]; 1522 for (unsigned i = 0; i < nexpr; i++) 1523 SubExprs[i] = args[i]; 1524 } 1525 1526 virtual SourceRange getSourceRange() const { 1527 return SourceRange(BuiltinLoc, RParenLoc); 1528 } 1529 static bool classof(const Stmt *T) { 1530 return T->getStmtClass() == ShuffleVectorExprClass; 1531 } 1532 static bool classof(const ShuffleVectorExpr *) { return true; } 1533 1534 ~ShuffleVectorExpr() { 1535 delete [] SubExprs; 1536 } 1537 1538 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1539 /// constant expression, the actual arguments passed in, and the function 1540 /// pointers. 1541 unsigned getNumSubExprs() const { return NumExprs; } 1542 1543 /// getExpr - Return the Expr at the specified index. 1544 Expr *getExpr(unsigned Index) { 1545 assert((Index < NumExprs) && "Arg access out of range!"); 1546 return cast<Expr>(SubExprs[Index]); 1547 } 1548 const Expr *getExpr(unsigned Index) const { 1549 assert((Index < NumExprs) && "Arg access out of range!"); 1550 return cast<Expr>(SubExprs[Index]); 1551 } 1552 1553 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1554 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1555 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1556 } 1557 1558 // Iterators 1559 virtual child_iterator child_begin(); 1560 virtual child_iterator child_end(); 1561 1562 virtual void EmitImpl(llvm::Serializer& S) const; 1563 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1564}; 1565 1566/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1567/// This AST node is similar to the conditional operator (?:) in C, with 1568/// the following exceptions: 1569/// - the test expression must be a integer constant expression. 1570/// - the expression returned acts like the chosen subexpression in every 1571/// visible way: the type is the same as that of the chosen subexpression, 1572/// and all predicates (whether it's an l-value, whether it's an integer 1573/// constant expression, etc.) return the same result as for the chosen 1574/// sub-expression. 1575class ChooseExpr : public Expr { 1576 enum { COND, LHS, RHS, END_EXPR }; 1577 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1578 SourceLocation BuiltinLoc, RParenLoc; 1579public: 1580 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1581 SourceLocation RP) 1582 : Expr(ChooseExprClass, t), 1583 BuiltinLoc(BLoc), RParenLoc(RP) { 1584 SubExprs[COND] = cond; 1585 SubExprs[LHS] = lhs; 1586 SubExprs[RHS] = rhs; 1587 } 1588 1589 /// isConditionTrue - Return whether the condition is true (i.e. not 1590 /// equal to zero). 1591 bool isConditionTrue(ASTContext &C) const; 1592 1593 /// getChosenSubExpr - Return the subexpression chosen according to the 1594 /// condition. 1595 Expr *getChosenSubExpr(ASTContext &C) const { 1596 return isConditionTrue(C) ? getLHS() : getRHS(); 1597 } 1598 1599 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1600 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1601 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1602 1603 virtual SourceRange getSourceRange() const { 1604 return SourceRange(BuiltinLoc, RParenLoc); 1605 } 1606 static bool classof(const Stmt *T) { 1607 return T->getStmtClass() == ChooseExprClass; 1608 } 1609 static bool classof(const ChooseExpr *) { return true; } 1610 1611 // Iterators 1612 virtual child_iterator child_begin(); 1613 virtual child_iterator child_end(); 1614 1615 virtual void EmitImpl(llvm::Serializer& S) const; 1616 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1617}; 1618 1619/// GNUNullExpr - Implements the GNU __null extension, which is a name 1620/// for a null pointer constant that has integral type (e.g., int or 1621/// long) and is the same size and alignment as a pointer. The __null 1622/// extension is typically only used by system headers, which define 1623/// NULL as __null in C++ rather than using 0 (which is an integer 1624/// that may not match the size of a pointer). 1625class GNUNullExpr : public Expr { 1626 /// TokenLoc - The location of the __null keyword. 1627 SourceLocation TokenLoc; 1628 1629public: 1630 GNUNullExpr(QualType Ty, SourceLocation Loc) 1631 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1632 1633 /// getTokenLocation - The location of the __null token. 1634 SourceLocation getTokenLocation() const { return TokenLoc; } 1635 1636 virtual SourceRange getSourceRange() const { 1637 return SourceRange(TokenLoc); 1638 } 1639 static bool classof(const Stmt *T) { 1640 return T->getStmtClass() == GNUNullExprClass; 1641 } 1642 static bool classof(const GNUNullExpr *) { return true; } 1643 1644 // Iterators 1645 virtual child_iterator child_begin(); 1646 virtual child_iterator child_end(); 1647 1648 virtual void EmitImpl(llvm::Serializer& S) const; 1649 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1650}; 1651 1652/// VAArgExpr, used for the builtin function __builtin_va_start. 1653class VAArgExpr : public Expr { 1654 Stmt *Val; 1655 SourceLocation BuiltinLoc, RParenLoc; 1656public: 1657 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1658 : Expr(VAArgExprClass, t), 1659 Val(e), 1660 BuiltinLoc(BLoc), 1661 RParenLoc(RPLoc) { } 1662 1663 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1664 Expr *getSubExpr() { return cast<Expr>(Val); } 1665 virtual SourceRange getSourceRange() const { 1666 return SourceRange(BuiltinLoc, RParenLoc); 1667 } 1668 static bool classof(const Stmt *T) { 1669 return T->getStmtClass() == VAArgExprClass; 1670 } 1671 static bool classof(const VAArgExpr *) { return true; } 1672 1673 // Iterators 1674 virtual child_iterator child_begin(); 1675 virtual child_iterator child_end(); 1676 1677 virtual void EmitImpl(llvm::Serializer& S) const; 1678 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1679}; 1680 1681/// @brief Describes an C or C++ initializer list. 1682/// 1683/// InitListExpr describes an initializer list, which can be used to 1684/// initialize objects of different types, including 1685/// struct/class/union types, arrays, and vectors. For example: 1686/// 1687/// @code 1688/// struct foo x = { 1, { 2, 3 } }; 1689/// @endcode 1690/// 1691/// Prior to semantic analysis, an initializer list will represent the 1692/// initializer list as written by the user, but will have the 1693/// placeholder type "void". This initializer list is called the 1694/// syntactic form of the initializer, and may contain C99 designated 1695/// initializers (represented as DesignatedInitExprs), initializations 1696/// of subobject members without explicit braces, and so on. Clients 1697/// interested in the original syntax of the initializer list should 1698/// use the syntactic form of the initializer list. 1699/// 1700/// After semantic analysis, the initializer list will represent the 1701/// semantic form of the initializer, where the initializations of all 1702/// subobjects are made explicit with nested InitListExpr nodes and 1703/// C99 designators have been eliminated by placing the designated 1704/// initializations into the subobject they initialize. Additionally, 1705/// any "holes" in the initialization, where no initializer has been 1706/// specified for a particular subobject, will be replaced with 1707/// implicitly-generated ImplicitValueInitExpr expressions that 1708/// value-initialize the subobjects. Note, however, that the 1709/// initializer lists may still have fewer initializers than there are 1710/// elements to initialize within the object. 1711/// 1712/// Given the semantic form of the initializer list, one can retrieve 1713/// the original syntactic form of that initializer list (if it 1714/// exists) using getSyntacticForm(). Since many initializer lists 1715/// have the same syntactic and semantic forms, getSyntacticForm() may 1716/// return NULL, indicating that the current initializer list also 1717/// serves as its syntactic form. 1718class InitListExpr : public Expr { 1719 std::vector<Stmt *> InitExprs; 1720 SourceLocation LBraceLoc, RBraceLoc; 1721 1722 /// Contains the initializer list that describes the syntactic form 1723 /// written in the source code. 1724 InitListExpr *SyntacticForm; 1725 1726 /// If this initializer list initializes a union, specifies which 1727 /// field within the union will be initialized. 1728 FieldDecl *UnionFieldInit; 1729 1730 /// Whether this initializer list originally had a GNU array-range 1731 /// designator in it. This is a temporary marker used by CodeGen. 1732 bool HadArrayRangeDesignator; 1733 1734public: 1735 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1736 SourceLocation rbraceloc); 1737 1738 unsigned getNumInits() const { return InitExprs.size(); } 1739 1740 const Expr* getInit(unsigned Init) const { 1741 assert(Init < getNumInits() && "Initializer access out of range!"); 1742 return cast_or_null<Expr>(InitExprs[Init]); 1743 } 1744 1745 Expr* getInit(unsigned Init) { 1746 assert(Init < getNumInits() && "Initializer access out of range!"); 1747 return cast_or_null<Expr>(InitExprs[Init]); 1748 } 1749 1750 void setInit(unsigned Init, Expr *expr) { 1751 assert(Init < getNumInits() && "Initializer access out of range!"); 1752 InitExprs[Init] = expr; 1753 } 1754 1755 /// @brief Specify the number of initializers 1756 /// 1757 /// If there are more than @p NumInits initializers, the remaining 1758 /// initializers will be destroyed. If there are fewer than @p 1759 /// NumInits initializers, NULL expressions will be added for the 1760 /// unknown initializers. 1761 void resizeInits(ASTContext &Context, unsigned NumInits); 1762 1763 /// @brief Updates the initializer at index @p Init with the new 1764 /// expression @p expr, and returns the old expression at that 1765 /// location. 1766 /// 1767 /// When @p Init is out of range for this initializer list, the 1768 /// initializer list will be extended with NULL expressions to 1769 /// accomodate the new entry. 1770 Expr *updateInit(unsigned Init, Expr *expr); 1771 1772 /// \brief If this initializes a union, specifies which field in the 1773 /// union to initialize. 1774 /// 1775 /// Typically, this field is the first named field within the 1776 /// union. However, a designated initializer can specify the 1777 /// initialization of a different field within the union. 1778 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1779 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1780 1781 // Explicit InitListExpr's originate from source code (and have valid source 1782 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1783 bool isExplicit() { 1784 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1785 } 1786 1787 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1788 1789 /// @brief Retrieve the initializer list that describes the 1790 /// syntactic form of the initializer. 1791 /// 1792 /// 1793 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1794 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1795 1796 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1797 void sawArrayRangeDesignator() { 1798 HadArrayRangeDesignator = true; 1799 } 1800 1801 virtual SourceRange getSourceRange() const { 1802 return SourceRange(LBraceLoc, RBraceLoc); 1803 } 1804 static bool classof(const Stmt *T) { 1805 return T->getStmtClass() == InitListExprClass; 1806 } 1807 static bool classof(const InitListExpr *) { return true; } 1808 1809 // Iterators 1810 virtual child_iterator child_begin(); 1811 virtual child_iterator child_end(); 1812 1813 typedef std::vector<Stmt *>::iterator iterator; 1814 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1815 1816 iterator begin() { return InitExprs.begin(); } 1817 iterator end() { return InitExprs.end(); } 1818 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1819 reverse_iterator rend() { return InitExprs.rend(); } 1820 1821 // Serailization. 1822 virtual void EmitImpl(llvm::Serializer& S) const; 1823 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1824 1825private: 1826 // Used by serializer. 1827 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1828}; 1829 1830/// @brief Represents a C99 designated initializer expression. 1831/// 1832/// A designated initializer expression (C99 6.7.8) contains one or 1833/// more designators (which can be field designators, array 1834/// designators, or GNU array-range designators) followed by an 1835/// expression that initializes the field or element(s) that the 1836/// designators refer to. For example, given: 1837/// 1838/// @code 1839/// struct point { 1840/// double x; 1841/// double y; 1842/// }; 1843/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1844/// @endcode 1845/// 1846/// The InitListExpr contains three DesignatedInitExprs, the first of 1847/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1848/// designators, one array designator for @c [2] followed by one field 1849/// designator for @c .y. The initalization expression will be 1.0. 1850class DesignatedInitExpr : public Expr { 1851 /// The location of the '=' or ':' prior to the actual initializer 1852 /// expression. 1853 SourceLocation EqualOrColonLoc; 1854 1855 /// Whether this designated initializer used the GNU deprecated ':' 1856 /// syntax rather than the C99 '=' syntax. 1857 bool UsesColonSyntax : 1; 1858 1859 /// The number of designators in this initializer expression. 1860 unsigned NumDesignators : 15; 1861 1862 /// The number of subexpressions of this initializer expression, 1863 /// which contains both the initializer and any additional 1864 /// expressions used by array and array-range designators. 1865 unsigned NumSubExprs : 16; 1866 1867 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1868 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1869 unsigned NumSubExprs) 1870 : Expr(DesignatedInitExprClass, Ty), 1871 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1872 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1873 1874public: 1875 /// A field designator, e.g., ".x". 1876 struct FieldDesignator { 1877 /// Refers to the field that is being initialized. The low bit 1878 /// of this field determines whether this is actually a pointer 1879 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1880 /// initially constructed, a field designator will store an 1881 /// IdentifierInfo*. After semantic analysis has resolved that 1882 /// name, the field designator will instead store a FieldDecl*. 1883 uintptr_t NameOrField; 1884 1885 /// The location of the '.' in the designated initializer. 1886 unsigned DotLoc; 1887 1888 /// The location of the field name in the designated initializer. 1889 unsigned FieldLoc; 1890 }; 1891 1892 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1893 struct ArrayOrRangeDesignator { 1894 /// Location of the first index expression within the designated 1895 /// initializer expression's list of subexpressions. 1896 unsigned Index; 1897 /// The location of the '[' starting the array range designator. 1898 unsigned LBracketLoc; 1899 /// The location of the ellipsis separating the start and end 1900 /// indices. Only valid for GNU array-range designators. 1901 unsigned EllipsisLoc; 1902 /// The location of the ']' terminating the array range designator. 1903 unsigned RBracketLoc; 1904 }; 1905 1906 /// @brief Represents a single C99 designator. 1907 /// 1908 /// @todo This class is infuriatingly similar to clang::Designator, 1909 /// but minor differences (storing indices vs. storing pointers) 1910 /// keep us from reusing it. Try harder, later, to rectify these 1911 /// differences. 1912 class Designator { 1913 /// @brief The kind of designator this describes. 1914 enum { 1915 FieldDesignator, 1916 ArrayDesignator, 1917 ArrayRangeDesignator 1918 } Kind; 1919 1920 union { 1921 /// A field designator, e.g., ".x". 1922 struct FieldDesignator Field; 1923 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1924 struct ArrayOrRangeDesignator ArrayOrRange; 1925 }; 1926 friend class DesignatedInitExpr; 1927 1928 public: 1929 /// @brief Initializes a field designator. 1930 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1931 SourceLocation FieldLoc) 1932 : Kind(FieldDesignator) { 1933 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1934 Field.DotLoc = DotLoc.getRawEncoding(); 1935 Field.FieldLoc = FieldLoc.getRawEncoding(); 1936 } 1937 1938 /// @brief Initializes an array designator. 1939 Designator(unsigned Index, SourceLocation LBracketLoc, 1940 SourceLocation RBracketLoc) 1941 : Kind(ArrayDesignator) { 1942 ArrayOrRange.Index = Index; 1943 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1944 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1945 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1946 } 1947 1948 /// @brief Initializes a GNU array-range designator. 1949 Designator(unsigned Index, SourceLocation LBracketLoc, 1950 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1951 : Kind(ArrayRangeDesignator) { 1952 ArrayOrRange.Index = Index; 1953 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1954 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1955 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1956 } 1957 1958 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1959 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1960 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1961 1962 IdentifierInfo * getFieldName(); 1963 1964 FieldDecl *getField() { 1965 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1966 if (Field.NameOrField & 0x01) 1967 return 0; 1968 else 1969 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1970 } 1971 1972 void setField(FieldDecl *FD) { 1973 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1974 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1975 } 1976 1977 SourceLocation getDotLoc() const { 1978 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1979 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1980 } 1981 1982 SourceLocation getFieldLoc() const { 1983 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1984 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1985 } 1986 1987 SourceLocation getLBracketLoc() const { 1988 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1989 "Only valid on an array or array-range designator"); 1990 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1991 } 1992 1993 SourceLocation getRBracketLoc() const { 1994 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1995 "Only valid on an array or array-range designator"); 1996 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1997 } 1998 1999 SourceLocation getEllipsisLoc() const { 2000 assert(Kind == ArrayRangeDesignator && 2001 "Only valid on an array-range designator"); 2002 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2003 } 2004 2005 SourceLocation getStartLocation() const { 2006 if (Kind == FieldDesignator) 2007 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2008 else 2009 return getLBracketLoc(); 2010 } 2011 }; 2012 2013 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2014 unsigned NumDesignators, 2015 Expr **IndexExprs, unsigned NumIndexExprs, 2016 SourceLocation EqualOrColonLoc, 2017 bool UsesColonSyntax, Expr *Init); 2018 2019 /// @brief Returns the number of designators in this initializer. 2020 unsigned size() const { return NumDesignators; } 2021 2022 // Iterator access to the designators. 2023 typedef Designator* designators_iterator; 2024 designators_iterator designators_begin(); 2025 designators_iterator designators_end(); 2026 2027 Expr *getArrayIndex(const Designator& D); 2028 Expr *getArrayRangeStart(const Designator& D); 2029 Expr *getArrayRangeEnd(const Designator& D); 2030 2031 /// @brief Retrieve the location of the '=' that precedes the 2032 /// initializer value itself, if present. 2033 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2034 2035 /// @brief Determines whether this designated initializer used the 2036 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 2037 bool usesColonSyntax() const { return UsesColonSyntax; } 2038 2039 /// @brief Retrieve the initializer value. 2040 Expr *getInit() const { 2041 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2042 } 2043 2044 void setInit(Expr *init) { 2045 *child_begin() = init; 2046 } 2047 2048 virtual SourceRange getSourceRange() const; 2049 2050 static bool classof(const Stmt *T) { 2051 return T->getStmtClass() == DesignatedInitExprClass; 2052 } 2053 static bool classof(const DesignatedInitExpr *) { return true; } 2054 2055 // Iterators 2056 virtual child_iterator child_begin(); 2057 virtual child_iterator child_end(); 2058}; 2059 2060/// \brief Represents an implicitly-generated value initialization of 2061/// an object of a given type. 2062/// 2063/// Implicit value initializations occur within semantic initializer 2064/// list expressions (InitListExpr) as placeholders for subobject 2065/// initializations not explicitly specified by the user. 2066/// 2067/// \see InitListExpr 2068class ImplicitValueInitExpr : public Expr { 2069public: 2070 explicit ImplicitValueInitExpr(QualType ty) 2071 : Expr(ImplicitValueInitExprClass, ty) { } 2072 2073 static bool classof(const Stmt *T) { 2074 return T->getStmtClass() == ImplicitValueInitExprClass; 2075 } 2076 static bool classof(const ImplicitValueInitExpr *) { return true; } 2077 2078 virtual SourceRange getSourceRange() const { 2079 return SourceRange(); 2080 } 2081 2082 // Iterators 2083 virtual child_iterator child_begin(); 2084 virtual child_iterator child_end(); 2085}; 2086 2087//===----------------------------------------------------------------------===// 2088// Clang Extensions 2089//===----------------------------------------------------------------------===// 2090 2091 2092/// ExtVectorElementExpr - This represents access to specific elements of a 2093/// vector, and may occur on the left hand side or right hand side. For example 2094/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2095/// 2096/// Note that the base may have either vector or pointer to vector type, just 2097/// like a struct field reference. 2098/// 2099class ExtVectorElementExpr : public Expr { 2100 Stmt *Base; 2101 IdentifierInfo &Accessor; 2102 SourceLocation AccessorLoc; 2103public: 2104 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2105 SourceLocation loc) 2106 : Expr(ExtVectorElementExprClass, ty), 2107 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2108 2109 const Expr *getBase() const { return cast<Expr>(Base); } 2110 Expr *getBase() { return cast<Expr>(Base); } 2111 2112 IdentifierInfo &getAccessor() const { return Accessor; } 2113 2114 /// getNumElements - Get the number of components being selected. 2115 unsigned getNumElements() const; 2116 2117 /// containsDuplicateElements - Return true if any element access is 2118 /// repeated. 2119 bool containsDuplicateElements() const; 2120 2121 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2122 /// aggregate Constant of ConstantInt(s). 2123 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2124 2125 virtual SourceRange getSourceRange() const { 2126 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2127 } 2128 2129 /// isArrow - Return true if the base expression is a pointer to vector, 2130 /// return false if the base expression is a vector. 2131 bool isArrow() const; 2132 2133 static bool classof(const Stmt *T) { 2134 return T->getStmtClass() == ExtVectorElementExprClass; 2135 } 2136 static bool classof(const ExtVectorElementExpr *) { return true; } 2137 2138 // Iterators 2139 virtual child_iterator child_begin(); 2140 virtual child_iterator child_end(); 2141 2142 virtual void EmitImpl(llvm::Serializer& S) const; 2143 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2144}; 2145 2146 2147/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2148/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2149class BlockExpr : public Expr { 2150protected: 2151 BlockDecl *TheBlock; 2152 bool HasBlockDeclRefExprs; 2153public: 2154 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2155 : Expr(BlockExprClass, ty), 2156 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2157 2158 const BlockDecl *getBlockDecl() const { return TheBlock; } 2159 BlockDecl *getBlockDecl() { return TheBlock; } 2160 2161 // Convenience functions for probing the underlying BlockDecl. 2162 SourceLocation getCaretLocation() const; 2163 const Stmt *getBody() const; 2164 Stmt *getBody(); 2165 2166 virtual SourceRange getSourceRange() const { 2167 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2168 } 2169 2170 /// getFunctionType - Return the underlying function type for this block. 2171 const FunctionType *getFunctionType() const; 2172 2173 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2174 /// contained inside. 2175 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2176 2177 static bool classof(const Stmt *T) { 2178 return T->getStmtClass() == BlockExprClass; 2179 } 2180 static bool classof(const BlockExpr *) { return true; } 2181 2182 // Iterators 2183 virtual child_iterator child_begin(); 2184 virtual child_iterator child_end(); 2185 2186 virtual void EmitImpl(llvm::Serializer& S) const; 2187 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2188}; 2189 2190/// BlockDeclRefExpr - A reference to a declared variable, function, 2191/// enum, etc. 2192class BlockDeclRefExpr : public Expr { 2193 ValueDecl *D; 2194 SourceLocation Loc; 2195 bool IsByRef; 2196public: 2197 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2198 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2199 2200 ValueDecl *getDecl() { return D; } 2201 const ValueDecl *getDecl() const { return D; } 2202 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2203 2204 bool isByRef() const { return IsByRef; } 2205 2206 static bool classof(const Stmt *T) { 2207 return T->getStmtClass() == BlockDeclRefExprClass; 2208 } 2209 static bool classof(const BlockDeclRefExpr *) { return true; } 2210 2211 // Iterators 2212 virtual child_iterator child_begin(); 2213 virtual child_iterator child_end(); 2214 2215 virtual void EmitImpl(llvm::Serializer& S) const; 2216 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2217}; 2218 2219} // end namespace clang 2220 2221#endif 2222