Expr.h revision 726e168dc09fb23f53c7b004f8e919421ee91806
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 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 243 /// its subexpression. If that subexpression is also a ParenExpr, 244 /// then this method recursively returns its subexpression, and so forth. 245 /// Otherwise, the method returns the current Expr. 246 Expr* IgnoreParens(); 247 248 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 249 /// or CastExprs, returning their operand. 250 Expr *IgnoreParenCasts(); 251 252 const Expr* IgnoreParens() const { 253 return const_cast<Expr*>(this)->IgnoreParens(); 254 } 255 const Expr *IgnoreParenCasts() const { 256 return const_cast<Expr*>(this)->IgnoreParenCasts(); 257 } 258 259 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 260 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 261 262 static bool classof(const Stmt *T) { 263 return T->getStmtClass() >= firstExprConstant && 264 T->getStmtClass() <= lastExprConstant; 265 } 266 static bool classof(const Expr *) { return true; } 267 268 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 269 return cast<Expr>(Stmt::Create(D, C)); 270 } 271}; 272 273 274//===----------------------------------------------------------------------===// 275// Primary Expressions. 276//===----------------------------------------------------------------------===// 277 278/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 279/// enum, etc. 280class DeclRefExpr : public Expr { 281 NamedDecl *D; 282 SourceLocation Loc; 283 284protected: 285 // FIXME: Eventually, this constructor will go away and all subclasses 286 // will have to provide the type- and value-dependent flags. 287 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 288 Expr(SC, t), D(d), Loc(l) {} 289 290 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 291 bool VD) : 292 Expr(SC, t, TD, VD), D(d), Loc(l) {} 293 294public: 295 // FIXME: Eventually, this constructor will go away and all clients 296 // will have to provide the type- and value-dependent flags. 297 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 298 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 299 300 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 301 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 302 303 NamedDecl *getDecl() { return D; } 304 const NamedDecl *getDecl() const { return D; } 305 void setDecl(NamedDecl *NewD) { D = NewD; } 306 307 SourceLocation getLocation() const { return Loc; } 308 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 309 310 static bool classof(const Stmt *T) { 311 return T->getStmtClass() == DeclRefExprClass || 312 T->getStmtClass() == CXXConditionDeclExprClass || 313 T->getStmtClass() == QualifiedDeclRefExprClass; 314 } 315 static bool classof(const DeclRefExpr *) { return true; } 316 317 // Iterators 318 virtual child_iterator child_begin(); 319 virtual child_iterator child_end(); 320 321 virtual void EmitImpl(llvm::Serializer& S) const; 322 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 323}; 324 325/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 326class PredefinedExpr : public Expr { 327public: 328 enum IdentType { 329 Func, 330 Function, 331 PrettyFunction 332 }; 333 334private: 335 SourceLocation Loc; 336 IdentType Type; 337public: 338 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 339 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 340 341 IdentType getIdentType() const { return Type; } 342 343 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 344 345 static bool classof(const Stmt *T) { 346 return T->getStmtClass() == PredefinedExprClass; 347 } 348 static bool classof(const PredefinedExpr *) { return true; } 349 350 // Iterators 351 virtual child_iterator child_begin(); 352 virtual child_iterator child_end(); 353 354 virtual void EmitImpl(llvm::Serializer& S) const; 355 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 356}; 357 358class IntegerLiteral : public Expr { 359 llvm::APInt Value; 360 SourceLocation Loc; 361public: 362 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 363 // or UnsignedLongLongTy 364 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 365 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 366 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 367 } 368 const llvm::APInt &getValue() const { return Value; } 369 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 370 371 static bool classof(const Stmt *T) { 372 return T->getStmtClass() == IntegerLiteralClass; 373 } 374 static bool classof(const IntegerLiteral *) { return true; } 375 376 // Iterators 377 virtual child_iterator child_begin(); 378 virtual child_iterator child_end(); 379 380 virtual void EmitImpl(llvm::Serializer& S) const; 381 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 382}; 383 384class CharacterLiteral : public Expr { 385 unsigned Value; 386 SourceLocation Loc; 387 bool IsWide; 388public: 389 // type should be IntTy 390 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 391 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 392 } 393 SourceLocation getLoc() const { return Loc; } 394 bool isWide() const { return IsWide; } 395 396 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 397 398 unsigned getValue() const { return Value; } 399 400 static bool classof(const Stmt *T) { 401 return T->getStmtClass() == CharacterLiteralClass; 402 } 403 static bool classof(const CharacterLiteral *) { return true; } 404 405 // Iterators 406 virtual child_iterator child_begin(); 407 virtual child_iterator child_end(); 408 409 virtual void EmitImpl(llvm::Serializer& S) const; 410 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 411}; 412 413class FloatingLiteral : public Expr { 414 llvm::APFloat Value; 415 bool IsExact : 1; 416 SourceLocation Loc; 417public: 418 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 419 QualType Type, SourceLocation L) 420 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 421 422 const llvm::APFloat &getValue() const { return Value; } 423 424 bool isExact() const { return IsExact; } 425 426 /// getValueAsApproximateDouble - This returns the value as an inaccurate 427 /// double. Note that this may cause loss of precision, but is useful for 428 /// debugging dumps, etc. 429 double getValueAsApproximateDouble() const; 430 431 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 432 433 static bool classof(const Stmt *T) { 434 return T->getStmtClass() == FloatingLiteralClass; 435 } 436 static bool classof(const FloatingLiteral *) { return true; } 437 438 // Iterators 439 virtual child_iterator child_begin(); 440 virtual child_iterator child_end(); 441 442 virtual void EmitImpl(llvm::Serializer& S) const; 443 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 444}; 445 446/// ImaginaryLiteral - We support imaginary integer and floating point literals, 447/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 448/// IntegerLiteral classes. Instances of this class always have a Complex type 449/// whose element type matches the subexpression. 450/// 451class ImaginaryLiteral : public Expr { 452 Stmt *Val; 453public: 454 ImaginaryLiteral(Expr *val, QualType Ty) 455 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 456 457 const Expr *getSubExpr() const { return cast<Expr>(Val); } 458 Expr *getSubExpr() { return cast<Expr>(Val); } 459 460 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 461 static bool classof(const Stmt *T) { 462 return T->getStmtClass() == ImaginaryLiteralClass; 463 } 464 static bool classof(const ImaginaryLiteral *) { return true; } 465 466 // Iterators 467 virtual child_iterator child_begin(); 468 virtual child_iterator child_end(); 469 470 virtual void EmitImpl(llvm::Serializer& S) const; 471 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 472}; 473 474/// StringLiteral - This represents a string literal expression, e.g. "foo" 475/// or L"bar" (wide strings). The actual string is returned by getStrData() 476/// is NOT null-terminated, and the length of the string is determined by 477/// calling getByteLength(). The C type for a string is always a 478/// ConstantArrayType. 479class StringLiteral : public Expr { 480 const char *StrData; 481 unsigned ByteLength; 482 bool IsWide; 483 // If the StringLiteral was composed using token pasting, both locations 484 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 485 unsigned NumConcatenated; 486 SourceLocation TokLocs[1]; 487public: 488 StringLiteral(ASTContext &C, const char *StrData, unsigned ByteLength, 489 bool Wide, QualType t, SourceLocation Loc); 490 StringLiteral(ASTContext &C, const char *StrData, unsigned ByteLength, 491 bool Wide, QualType t, SourceLocation *Loc, unsigned NumStrs); 492 493 void Destroy(ASTContext &C); 494 495 const char *getStrData() const { return StrData; } 496 unsigned getByteLength() const { return ByteLength; } 497 bool isWide() const { return IsWide; } 498 499 /// getNumConcatenated - Get the number of string literal tokens that were 500 /// concatenated in translation phase #6 to form this string literal. 501 unsigned getNumConcatenated() const { return NumConcatenated; } 502 503 SourceLocation getStrTokenLoc(unsigned TokNum) const { 504 assert(TokNum < NumConcatenated && "Invalid tok number"); 505 return TokLocs[TokNum]; 506 } 507 508 virtual SourceRange getSourceRange() const { 509 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 510 } 511 static bool classof(const Stmt *T) { 512 return T->getStmtClass() == StringLiteralClass; 513 } 514 static bool classof(const StringLiteral *) { return true; } 515 516 // Iterators 517 virtual child_iterator child_begin(); 518 virtual child_iterator child_end(); 519 520 virtual void EmitImpl(llvm::Serializer& S) const; 521 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 522}; 523 524/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 525/// AST node is only formed if full location information is requested. 526class ParenExpr : public Expr { 527 SourceLocation L, R; 528 Stmt *Val; 529public: 530 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 531 : Expr(ParenExprClass, val->getType(), 532 val->isTypeDependent(), val->isValueDependent()), 533 L(l), R(r), Val(val) {} 534 535 const Expr *getSubExpr() const { return cast<Expr>(Val); } 536 Expr *getSubExpr() { return cast<Expr>(Val); } 537 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 538 539 static bool classof(const Stmt *T) { 540 return T->getStmtClass() == ParenExprClass; 541 } 542 static bool classof(const ParenExpr *) { return true; } 543 544 // Iterators 545 virtual child_iterator child_begin(); 546 virtual child_iterator child_end(); 547 548 virtual void EmitImpl(llvm::Serializer& S) const; 549 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 550}; 551 552 553/// UnaryOperator - This represents the unary-expression's (except sizeof and 554/// alignof), the postinc/postdec operators from postfix-expression, and various 555/// extensions. 556/// 557/// Notes on various nodes: 558/// 559/// Real/Imag - These return the real/imag part of a complex operand. If 560/// applied to a non-complex value, the former returns its operand and the 561/// later returns zero in the type of the operand. 562/// 563/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 564/// subexpression is a compound literal with the various MemberExpr and 565/// ArraySubscriptExpr's applied to it. 566/// 567class UnaryOperator : public Expr { 568public: 569 // Note that additions to this should also update the StmtVisitor class. 570 enum Opcode { 571 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 572 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 573 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 574 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 575 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 576 Real, Imag, // "__real expr"/"__imag expr" Extension. 577 Extension, // __extension__ marker. 578 OffsetOf // __builtin_offsetof 579 }; 580private: 581 Stmt *Val; 582 Opcode Opc; 583 SourceLocation Loc; 584public: 585 586 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 587 : Expr(UnaryOperatorClass, type, 588 input->isTypeDependent() && opc != OffsetOf, 589 input->isValueDependent()), 590 Val(input), Opc(opc), Loc(l) {} 591 592 Opcode getOpcode() const { return Opc; } 593 Expr *getSubExpr() const { return cast<Expr>(Val); } 594 595 /// getOperatorLoc - Return the location of the operator. 596 SourceLocation getOperatorLoc() const { return Loc; } 597 598 /// isPostfix - Return true if this is a postfix operation, like x++. 599 static bool isPostfix(Opcode Op); 600 601 /// isPostfix - Return true if this is a prefix operation, like --x. 602 static bool isPrefix(Opcode Op); 603 604 bool isPrefix() const { return isPrefix(Opc); } 605 bool isPostfix() const { return isPostfix(Opc); } 606 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 607 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 608 bool isOffsetOfOp() const { return Opc == OffsetOf; } 609 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 610 611 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 612 /// corresponds to, e.g. "sizeof" or "[pre]++" 613 static const char *getOpcodeStr(Opcode Op); 614 615 virtual SourceRange getSourceRange() const { 616 if (isPostfix()) 617 return SourceRange(Val->getLocStart(), Loc); 618 else 619 return SourceRange(Loc, Val->getLocEnd()); 620 } 621 virtual SourceLocation getExprLoc() const { return Loc; } 622 623 static bool classof(const Stmt *T) { 624 return T->getStmtClass() == UnaryOperatorClass; 625 } 626 static bool classof(const UnaryOperator *) { return true; } 627 628 int64_t evaluateOffsetOf(ASTContext& C) const; 629 630 // Iterators 631 virtual child_iterator child_begin(); 632 virtual child_iterator child_end(); 633 634 virtual void EmitImpl(llvm::Serializer& S) const; 635 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 636}; 637 638/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 639/// types and expressions. 640class SizeOfAlignOfExpr : public Expr { 641 bool isSizeof : 1; // true if sizeof, false if alignof. 642 bool isType : 1; // true if operand is a type, false if an expression 643 union { 644 void *Ty; 645 Stmt *Ex; 646 } Argument; 647 SourceLocation OpLoc, RParenLoc; 648public: 649 SizeOfAlignOfExpr(bool issizeof, bool istype, void *argument, 650 QualType resultType, SourceLocation op, 651 SourceLocation rp) : 652 Expr(SizeOfAlignOfExprClass, resultType), isSizeof(issizeof), 653 isType(istype), OpLoc(op), RParenLoc(rp) { 654 if (isType) 655 Argument.Ty = argument; 656 else 657 // argument was an Expr*, so cast it back to that to be safe 658 Argument.Ex = static_cast<Expr*>(argument); 659 } 660 661 virtual void Destroy(ASTContext& C); 662 663 bool isSizeOf() const { return isSizeof; } 664 bool isArgumentType() const { return isType; } 665 QualType getArgumentType() const { 666 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 667 return QualType::getFromOpaquePtr(Argument.Ty); 668 } 669 Expr *getArgumentExpr() { 670 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 671 return static_cast<Expr*>(Argument.Ex); 672 } 673 const Expr *getArgumentExpr() const { 674 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 675 } 676 677 /// Gets the argument type, or the type of the argument expression, whichever 678 /// is appropriate. 679 QualType getTypeOfArgument() const { 680 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 681 } 682 683 SourceLocation getOperatorLoc() const { return OpLoc; } 684 685 virtual SourceRange getSourceRange() const { 686 return SourceRange(OpLoc, RParenLoc); 687 } 688 689 static bool classof(const Stmt *T) { 690 return T->getStmtClass() == SizeOfAlignOfExprClass; 691 } 692 static bool classof(const SizeOfAlignOfExpr *) { return true; } 693 694 // Iterators 695 virtual child_iterator child_begin(); 696 virtual child_iterator child_end(); 697 698 virtual void EmitImpl(llvm::Serializer& S) const; 699 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 700}; 701 702//===----------------------------------------------------------------------===// 703// Postfix Operators. 704//===----------------------------------------------------------------------===// 705 706/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 707class ArraySubscriptExpr : public Expr { 708 enum { LHS, RHS, END_EXPR=2 }; 709 Stmt* SubExprs[END_EXPR]; 710 SourceLocation RBracketLoc; 711public: 712 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 713 SourceLocation rbracketloc) 714 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 715 SubExprs[LHS] = lhs; 716 SubExprs[RHS] = rhs; 717 } 718 719 /// An array access can be written A[4] or 4[A] (both are equivalent). 720 /// - getBase() and getIdx() always present the normalized view: A[4]. 721 /// In this case getBase() returns "A" and getIdx() returns "4". 722 /// - getLHS() and getRHS() present the syntactic view. e.g. for 723 /// 4[A] getLHS() returns "4". 724 /// Note: Because vector element access is also written A[4] we must 725 /// predicate the format conversion in getBase and getIdx only on the 726 /// the type of the RHS, as it is possible for the LHS to be a vector of 727 /// integer type 728 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 729 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 730 731 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 732 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 733 734 Expr *getBase() { 735 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 736 } 737 738 const Expr *getBase() const { 739 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 740 } 741 742 Expr *getIdx() { 743 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 744 } 745 746 const Expr *getIdx() const { 747 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 748 } 749 750 virtual SourceRange getSourceRange() const { 751 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 752 } 753 754 SourceLocation getRBracketLoc() const { return RBracketLoc; } 755 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 756 757 static bool classof(const Stmt *T) { 758 return T->getStmtClass() == ArraySubscriptExprClass; 759 } 760 static bool classof(const ArraySubscriptExpr *) { 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 ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 768}; 769 770 771/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 772/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 773/// while its subclasses may represent alternative syntax that (semantically) 774/// results in a function call. For example, CXXOperatorCallExpr is 775/// a subclass for overloaded operator calls that use operator syntax, e.g., 776/// "str1 + str2" to resolve to a function call. 777class CallExpr : public Expr { 778 enum { FN=0, ARGS_START=1 }; 779 Stmt **SubExprs; 780 unsigned NumArgs; 781 SourceLocation RParenLoc; 782 783 // This version of the ctor is for deserialization. 784 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 785 SourceLocation rparenloc) 786 : Expr(SC,t), SubExprs(subexprs), 787 NumArgs(numargs), RParenLoc(rparenloc) {} 788 789protected: 790 // This version of the constructor is for derived classes. 791 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 792 QualType t, SourceLocation rparenloc); 793 794public: 795 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 796 SourceLocation rparenloc); 797 798 ~CallExpr() {} 799 800 void Destroy(ASTContext& C); 801 802 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 803 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 804 void setCallee(Expr *F) { SubExprs[FN] = F; } 805 806 /// getNumArgs - Return the number of actual arguments to this call. 807 /// 808 unsigned getNumArgs() const { return NumArgs; } 809 810 /// getArg - Return the specified argument. 811 Expr *getArg(unsigned Arg) { 812 assert(Arg < NumArgs && "Arg access out of range!"); 813 return cast<Expr>(SubExprs[Arg+ARGS_START]); 814 } 815 const Expr *getArg(unsigned Arg) const { 816 assert(Arg < NumArgs && "Arg access out of range!"); 817 return cast<Expr>(SubExprs[Arg+ARGS_START]); 818 } 819 820 // FIXME: Why is this needed? Why not just create the CallExpr with the 821 // corect number of arguments? It makes the ASTs less brittle. 822 /// setArg - Set the specified argument. 823 void setArg(unsigned Arg, Expr *ArgExpr) { 824 assert(Arg < NumArgs && "Arg access out of range!"); 825 SubExprs[Arg+ARGS_START] = ArgExpr; 826 } 827 828 // FIXME: It would be great to just get rid of this. There is only one 829 // callee of this method, and it probably could be refactored to not use 830 // this method and instead just create a CallExpr with the right number of 831 // arguments. 832 /// setNumArgs - This changes the number of arguments present in this call. 833 /// Any orphaned expressions are deleted by this, and any new operands are set 834 /// to null. 835 void setNumArgs(ASTContext& C, unsigned NumArgs); 836 837 typedef ExprIterator arg_iterator; 838 typedef ConstExprIterator const_arg_iterator; 839 840 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 841 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 842 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 843 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 844 845 /// getNumCommas - Return the number of commas that must have been present in 846 /// this function call. 847 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 848 849 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 850 /// not, return 0. 851 unsigned isBuiltinCall(ASTContext &Context) const; 852 853 SourceLocation getRParenLoc() const { return RParenLoc; } 854 855 virtual SourceRange getSourceRange() const { 856 return SourceRange(getCallee()->getLocStart(), RParenLoc); 857 } 858 859 static bool classof(const Stmt *T) { 860 return T->getStmtClass() == CallExprClass || 861 T->getStmtClass() == CXXOperatorCallExprClass || 862 T->getStmtClass() == CXXMemberCallExprClass; 863 } 864 static bool classof(const CallExpr *) { return true; } 865 static bool classof(const CXXOperatorCallExpr *) { return true; } 866 static bool classof(const CXXMemberCallExpr *) { return true; } 867 868 // Iterators 869 virtual child_iterator child_begin(); 870 virtual child_iterator child_end(); 871 872 virtual void EmitImpl(llvm::Serializer& S) const; 873 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 874 StmtClass SC); 875}; 876 877/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 878/// 879class MemberExpr : public Expr { 880 Stmt *Base; 881 NamedDecl *MemberDecl; 882 SourceLocation MemberLoc; 883 bool IsArrow; // True if this is "X->F", false if this is "X.F". 884public: 885 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 886 QualType ty) 887 : Expr(MemberExprClass, ty), 888 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 889 890 void setBase(Expr *E) { Base = E; } 891 Expr *getBase() const { return cast<Expr>(Base); } 892 NamedDecl *getMemberDecl() const { return MemberDecl; } 893 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 894 bool isArrow() const { return IsArrow; } 895 SourceLocation getMemberLoc() const { return MemberLoc; } 896 897 virtual SourceRange getSourceRange() const { 898 return SourceRange(getBase()->getLocStart(), MemberLoc); 899 } 900 901 virtual SourceLocation getExprLoc() const { return MemberLoc; } 902 903 static bool classof(const Stmt *T) { 904 return T->getStmtClass() == MemberExprClass; 905 } 906 static bool classof(const MemberExpr *) { return true; } 907 908 // Iterators 909 virtual child_iterator child_begin(); 910 virtual child_iterator child_end(); 911 912 virtual void EmitImpl(llvm::Serializer& S) const; 913 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 914}; 915 916/// CompoundLiteralExpr - [C99 6.5.2.5] 917/// 918class CompoundLiteralExpr : public Expr { 919 /// LParenLoc - If non-null, this is the location of the left paren in a 920 /// compound literal like "(int){4}". This can be null if this is a 921 /// synthesized compound expression. 922 SourceLocation LParenLoc; 923 Stmt *Init; 924 bool FileScope; 925public: 926 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 927 bool fileScope) 928 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 929 FileScope(fileScope) {} 930 931 const Expr *getInitializer() const { return cast<Expr>(Init); } 932 Expr *getInitializer() { return cast<Expr>(Init); } 933 934 bool isFileScope() const { return FileScope; } 935 936 SourceLocation getLParenLoc() const { return LParenLoc; } 937 938 virtual SourceRange getSourceRange() const { 939 // FIXME: Init should never be null. 940 if (!Init) 941 return SourceRange(); 942 if (LParenLoc.isInvalid()) 943 return Init->getSourceRange(); 944 return SourceRange(LParenLoc, Init->getLocEnd()); 945 } 946 947 static bool classof(const Stmt *T) { 948 return T->getStmtClass() == CompoundLiteralExprClass; 949 } 950 static bool classof(const CompoundLiteralExpr *) { return true; } 951 952 // Iterators 953 virtual child_iterator child_begin(); 954 virtual child_iterator child_end(); 955 956 virtual void EmitImpl(llvm::Serializer& S) const; 957 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 958}; 959 960/// CastExpr - Base class for type casts, including both implicit 961/// casts (ImplicitCastExpr) and explicit casts that have some 962/// representation in the source code (ExplicitCastExpr's derived 963/// classes). 964class CastExpr : public Expr { 965 Stmt *Op; 966protected: 967 CastExpr(StmtClass SC, QualType ty, Expr *op) : 968 Expr(SC, ty, 969 // Cast expressions are type-dependent if the type is 970 // dependent (C++ [temp.dep.expr]p3). 971 ty->isDependentType(), 972 // Cast expressions are value-dependent if the type is 973 // dependent or if the subexpression is value-dependent. 974 ty->isDependentType() || (op && op->isValueDependent())), 975 Op(op) {} 976 977public: 978 Expr *getSubExpr() { return cast<Expr>(Op); } 979 const Expr *getSubExpr() const { return cast<Expr>(Op); } 980 981 static bool classof(const Stmt *T) { 982 StmtClass SC = T->getStmtClass(); 983 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 984 return true; 985 986 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 987 return true; 988 989 return false; 990 } 991 static bool classof(const CastExpr *) { return true; } 992 993 // Iterators 994 virtual child_iterator child_begin(); 995 virtual child_iterator child_end(); 996}; 997 998/// ImplicitCastExpr - Allows us to explicitly represent implicit type 999/// conversions, which have no direct representation in the original 1000/// source code. For example: converting T[]->T*, void f()->void 1001/// (*f)(), float->double, short->int, etc. 1002/// 1003/// In C, implicit casts always produce rvalues. However, in C++, an 1004/// implicit cast whose result is being bound to a reference will be 1005/// an lvalue. For example: 1006/// 1007/// @code 1008/// class Base { }; 1009/// class Derived : public Base { }; 1010/// void f(Derived d) { 1011/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1012/// } 1013/// @endcode 1014class ImplicitCastExpr : public CastExpr { 1015 /// LvalueCast - Whether this cast produces an lvalue. 1016 bool LvalueCast; 1017 1018public: 1019 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1020 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1021 1022 virtual SourceRange getSourceRange() const { 1023 return getSubExpr()->getSourceRange(); 1024 } 1025 1026 /// isLvalueCast - Whether this cast produces an lvalue. 1027 bool isLvalueCast() const { return LvalueCast; } 1028 1029 /// setLvalueCast - Set whether this cast produces an lvalue. 1030 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1031 1032 static bool classof(const Stmt *T) { 1033 return T->getStmtClass() == ImplicitCastExprClass; 1034 } 1035 static bool classof(const ImplicitCastExpr *) { return true; } 1036 1037 virtual void EmitImpl(llvm::Serializer& S) const; 1038 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1039}; 1040 1041/// ExplicitCastExpr - An explicit cast written in the source 1042/// code. 1043/// 1044/// This class is effectively an abstract class, because it provides 1045/// the basic representation of an explicitly-written cast without 1046/// specifying which kind of cast (C cast, functional cast, static 1047/// cast, etc.) was written; specific derived classes represent the 1048/// particular style of cast and its location information. 1049/// 1050/// Unlike implicit casts, explicit cast nodes have two different 1051/// types: the type that was written into the source code, and the 1052/// actual type of the expression as determined by semantic 1053/// analysis. These types may differ slightly. For example, in C++ one 1054/// can cast to a reference type, which indicates that the resulting 1055/// expression will be an lvalue. The reference type, however, will 1056/// not be used as the type of the expression. 1057class ExplicitCastExpr : public CastExpr { 1058 /// TypeAsWritten - The type that this expression is casting to, as 1059 /// written in the source code. 1060 QualType TypeAsWritten; 1061 1062protected: 1063 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1064 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1065 1066public: 1067 /// getTypeAsWritten - Returns the type that this expression is 1068 /// casting to, as written in the source code. 1069 QualType getTypeAsWritten() const { return TypeAsWritten; } 1070 1071 static bool classof(const Stmt *T) { 1072 StmtClass SC = T->getStmtClass(); 1073 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1074 return true; 1075 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1076 return true; 1077 1078 return false; 1079 } 1080 static bool classof(const ExplicitCastExpr *) { return true; } 1081}; 1082 1083/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1084/// cast in C++ (C++ [expr.cast]), which uses the syntax 1085/// (Type)expr. For example: @c (int)f. 1086class CStyleCastExpr : public ExplicitCastExpr { 1087 SourceLocation LPLoc; // the location of the left paren 1088 SourceLocation RPLoc; // the location of the right paren 1089public: 1090 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1091 SourceLocation l, SourceLocation r) : 1092 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1093 LPLoc(l), RPLoc(r) {} 1094 1095 SourceLocation getLParenLoc() const { return LPLoc; } 1096 SourceLocation getRParenLoc() const { return RPLoc; } 1097 1098 virtual SourceRange getSourceRange() const { 1099 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1100 } 1101 static bool classof(const Stmt *T) { 1102 return T->getStmtClass() == CStyleCastExprClass; 1103 } 1104 static bool classof(const CStyleCastExpr *) { return true; } 1105 1106 virtual void EmitImpl(llvm::Serializer& S) const; 1107 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1108}; 1109 1110class BinaryOperator : public Expr { 1111public: 1112 enum Opcode { 1113 // Operators listed in order of precedence. 1114 // Note that additions to this should also update the StmtVisitor class. 1115 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1116 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1117 Add, Sub, // [C99 6.5.6] Additive operators. 1118 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1119 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1120 EQ, NE, // [C99 6.5.9] Equality operators. 1121 And, // [C99 6.5.10] Bitwise AND operator. 1122 Xor, // [C99 6.5.11] Bitwise XOR operator. 1123 Or, // [C99 6.5.12] Bitwise OR operator. 1124 LAnd, // [C99 6.5.13] Logical AND operator. 1125 LOr, // [C99 6.5.14] Logical OR operator. 1126 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1127 DivAssign, RemAssign, 1128 AddAssign, SubAssign, 1129 ShlAssign, ShrAssign, 1130 AndAssign, XorAssign, 1131 OrAssign, 1132 Comma // [C99 6.5.17] Comma operator. 1133 }; 1134private: 1135 enum { LHS, RHS, END_EXPR }; 1136 Stmt* SubExprs[END_EXPR]; 1137 Opcode Opc; 1138 SourceLocation OpLoc; 1139public: 1140 1141 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1142 SourceLocation opLoc) 1143 : Expr(BinaryOperatorClass, ResTy, 1144 lhs->isTypeDependent() || rhs->isTypeDependent(), 1145 lhs->isValueDependent() || rhs->isValueDependent()), 1146 Opc(opc), OpLoc(opLoc) { 1147 SubExprs[LHS] = lhs; 1148 SubExprs[RHS] = rhs; 1149 assert(!isCompoundAssignmentOp() && 1150 "Use ArithAssignBinaryOperator for compound assignments"); 1151 } 1152 1153 SourceLocation getOperatorLoc() const { return OpLoc; } 1154 Opcode getOpcode() const { return Opc; } 1155 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1156 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1157 virtual SourceRange getSourceRange() const { 1158 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1159 } 1160 1161 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1162 /// corresponds to, e.g. "<<=". 1163 static const char *getOpcodeStr(Opcode Op); 1164 1165 /// predicates to categorize the respective opcodes. 1166 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1167 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1168 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1169 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1170 1171 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1172 bool isRelationalOp() const { return isRelationalOp(Opc); } 1173 1174 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1175 bool isEqualityOp() const { return isEqualityOp(Opc); } 1176 1177 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1178 bool isLogicalOp() const { return isLogicalOp(Opc); } 1179 1180 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1181 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1182 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1183 1184 static bool classof(const Stmt *S) { 1185 return S->getStmtClass() == BinaryOperatorClass || 1186 S->getStmtClass() == CompoundAssignOperatorClass; 1187 } 1188 static bool classof(const BinaryOperator *) { return true; } 1189 1190 // Iterators 1191 virtual child_iterator child_begin(); 1192 virtual child_iterator child_end(); 1193 1194 virtual void EmitImpl(llvm::Serializer& S) const; 1195 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1196 1197protected: 1198 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1199 SourceLocation oploc, bool dead) 1200 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1201 SubExprs[LHS] = lhs; 1202 SubExprs[RHS] = rhs; 1203 } 1204}; 1205 1206/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1207/// track of the type the operation is performed in. Due to the semantics of 1208/// these operators, the operands are promoted, the aritmetic performed, an 1209/// implicit conversion back to the result type done, then the assignment takes 1210/// place. This captures the intermediate type which the computation is done 1211/// in. 1212class CompoundAssignOperator : public BinaryOperator { 1213 QualType ComputationType; 1214public: 1215 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1216 QualType ResType, QualType CompType, 1217 SourceLocation OpLoc) 1218 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1219 ComputationType(CompType) { 1220 assert(isCompoundAssignmentOp() && 1221 "Only should be used for compound assignments"); 1222 } 1223 1224 QualType getComputationType() const { return ComputationType; } 1225 1226 static bool classof(const CompoundAssignOperator *) { return true; } 1227 static bool classof(const Stmt *S) { 1228 return S->getStmtClass() == CompoundAssignOperatorClass; 1229 } 1230 1231 virtual void EmitImpl(llvm::Serializer& S) const; 1232 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1233 ASTContext& C); 1234}; 1235 1236/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1237/// GNU "missing LHS" extension is in use. 1238/// 1239class ConditionalOperator : public Expr { 1240 enum { COND, LHS, RHS, END_EXPR }; 1241 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1242public: 1243 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1244 : Expr(ConditionalOperatorClass, t, 1245 // FIXME: the type of the conditional operator doesn't 1246 // depend on the type of the conditional, but the standard 1247 // seems to imply that it could. File a bug! 1248 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1249 (cond->isValueDependent() || 1250 (lhs && lhs->isValueDependent()) || 1251 (rhs && rhs->isValueDependent()))) { 1252 SubExprs[COND] = cond; 1253 SubExprs[LHS] = lhs; 1254 SubExprs[RHS] = rhs; 1255 } 1256 1257 // getCond - Return the expression representing the condition for 1258 // the ?: operator. 1259 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1260 1261 // getTrueExpr - Return the subexpression representing the value of the ?: 1262 // expression if the condition evaluates to true. In most cases this value 1263 // will be the same as getLHS() except a GCC extension allows the left 1264 // subexpression to be omitted, and instead of the condition be returned. 1265 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1266 // is only evaluated once. 1267 Expr *getTrueExpr() const { 1268 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1269 } 1270 1271 // getTrueExpr - Return the subexpression representing the value of the ?: 1272 // expression if the condition evaluates to false. This is the same as getRHS. 1273 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1274 1275 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1276 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1277 1278 virtual SourceRange getSourceRange() const { 1279 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1280 } 1281 static bool classof(const Stmt *T) { 1282 return T->getStmtClass() == ConditionalOperatorClass; 1283 } 1284 static bool classof(const ConditionalOperator *) { return true; } 1285 1286 // Iterators 1287 virtual child_iterator child_begin(); 1288 virtual child_iterator child_end(); 1289 1290 virtual void EmitImpl(llvm::Serializer& S) const; 1291 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1292}; 1293 1294/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1295class AddrLabelExpr : public Expr { 1296 SourceLocation AmpAmpLoc, LabelLoc; 1297 LabelStmt *Label; 1298public: 1299 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1300 QualType t) 1301 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1302 1303 virtual SourceRange getSourceRange() const { 1304 return SourceRange(AmpAmpLoc, LabelLoc); 1305 } 1306 1307 LabelStmt *getLabel() const { return Label; } 1308 1309 static bool classof(const Stmt *T) { 1310 return T->getStmtClass() == AddrLabelExprClass; 1311 } 1312 static bool classof(const AddrLabelExpr *) { return true; } 1313 1314 // Iterators 1315 virtual child_iterator child_begin(); 1316 virtual child_iterator child_end(); 1317 1318 virtual void EmitImpl(llvm::Serializer& S) const; 1319 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1320}; 1321 1322/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1323/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1324/// takes the value of the last subexpression. 1325class StmtExpr : public Expr { 1326 Stmt *SubStmt; 1327 SourceLocation LParenLoc, RParenLoc; 1328public: 1329 StmtExpr(CompoundStmt *substmt, QualType T, 1330 SourceLocation lp, SourceLocation rp) : 1331 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1332 1333 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1334 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1335 1336 virtual SourceRange getSourceRange() const { 1337 return SourceRange(LParenLoc, RParenLoc); 1338 } 1339 1340 SourceLocation getLParenLoc() const { return LParenLoc; } 1341 SourceLocation getRParenLoc() const { return RParenLoc; } 1342 1343 static bool classof(const Stmt *T) { 1344 return T->getStmtClass() == StmtExprClass; 1345 } 1346 static bool classof(const StmtExpr *) { return true; } 1347 1348 // Iterators 1349 virtual child_iterator child_begin(); 1350 virtual child_iterator child_end(); 1351 1352 virtual void EmitImpl(llvm::Serializer& S) const; 1353 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1354}; 1355 1356/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1357/// This AST node represents a function that returns 1 if two *types* (not 1358/// expressions) are compatible. The result of this built-in function can be 1359/// used in integer constant expressions. 1360class TypesCompatibleExpr : public Expr { 1361 QualType Type1; 1362 QualType Type2; 1363 SourceLocation BuiltinLoc, RParenLoc; 1364public: 1365 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1366 QualType t1, QualType t2, SourceLocation RP) : 1367 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1368 BuiltinLoc(BLoc), RParenLoc(RP) {} 1369 1370 QualType getArgType1() const { return Type1; } 1371 QualType getArgType2() const { return Type2; } 1372 1373 virtual SourceRange getSourceRange() const { 1374 return SourceRange(BuiltinLoc, RParenLoc); 1375 } 1376 static bool classof(const Stmt *T) { 1377 return T->getStmtClass() == TypesCompatibleExprClass; 1378 } 1379 static bool classof(const TypesCompatibleExpr *) { return true; } 1380 1381 // Iterators 1382 virtual child_iterator child_begin(); 1383 virtual child_iterator child_end(); 1384 1385 virtual void EmitImpl(llvm::Serializer& S) const; 1386 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1387}; 1388 1389/// ShuffleVectorExpr - clang-specific builtin-in function 1390/// __builtin_shufflevector. 1391/// This AST node represents a operator that does a constant 1392/// shuffle, similar to LLVM's shufflevector instruction. It takes 1393/// two vectors and a variable number of constant indices, 1394/// and returns the appropriately shuffled vector. 1395class ShuffleVectorExpr : public Expr { 1396 SourceLocation BuiltinLoc, RParenLoc; 1397 1398 // SubExprs - the list of values passed to the __builtin_shufflevector 1399 // function. The first two are vectors, and the rest are constant 1400 // indices. The number of values in this list is always 1401 // 2+the number of indices in the vector type. 1402 Stmt **SubExprs; 1403 unsigned NumExprs; 1404 1405public: 1406 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1407 QualType Type, SourceLocation BLoc, 1408 SourceLocation RP) : 1409 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1410 RParenLoc(RP), NumExprs(nexpr) { 1411 1412 SubExprs = new Stmt*[nexpr]; 1413 for (unsigned i = 0; i < nexpr; i++) 1414 SubExprs[i] = args[i]; 1415 } 1416 1417 virtual SourceRange getSourceRange() const { 1418 return SourceRange(BuiltinLoc, RParenLoc); 1419 } 1420 static bool classof(const Stmt *T) { 1421 return T->getStmtClass() == ShuffleVectorExprClass; 1422 } 1423 static bool classof(const ShuffleVectorExpr *) { return true; } 1424 1425 ~ShuffleVectorExpr() { 1426 delete [] SubExprs; 1427 } 1428 1429 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1430 /// constant expression, the actual arguments passed in, and the function 1431 /// pointers. 1432 unsigned getNumSubExprs() const { return NumExprs; } 1433 1434 /// getExpr - Return the Expr at the specified index. 1435 Expr *getExpr(unsigned Index) { 1436 assert((Index < NumExprs) && "Arg access out of range!"); 1437 return cast<Expr>(SubExprs[Index]); 1438 } 1439 const Expr *getExpr(unsigned Index) const { 1440 assert((Index < NumExprs) && "Arg access out of range!"); 1441 return cast<Expr>(SubExprs[Index]); 1442 } 1443 1444 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1445 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1446 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1447 } 1448 1449 // Iterators 1450 virtual child_iterator child_begin(); 1451 virtual child_iterator child_end(); 1452 1453 virtual void EmitImpl(llvm::Serializer& S) const; 1454 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1455}; 1456 1457/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1458/// This AST node is similar to the conditional operator (?:) in C, with 1459/// the following exceptions: 1460/// - the test expression must be a constant expression. 1461/// - the expression returned has it's type unaltered by promotion rules. 1462/// - does not evaluate the expression that was not chosen. 1463class ChooseExpr : public Expr { 1464 enum { COND, LHS, RHS, END_EXPR }; 1465 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1466 SourceLocation BuiltinLoc, RParenLoc; 1467public: 1468 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1469 SourceLocation RP) 1470 : Expr(ChooseExprClass, t), 1471 BuiltinLoc(BLoc), RParenLoc(RP) { 1472 SubExprs[COND] = cond; 1473 SubExprs[LHS] = lhs; 1474 SubExprs[RHS] = rhs; 1475 } 1476 1477 /// isConditionTrue - Return true if the condition is true. This is always 1478 /// statically knowable for a well-formed choosexpr. 1479 bool isConditionTrue(ASTContext &C) const; 1480 1481 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1482 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1483 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1484 1485 virtual SourceRange getSourceRange() const { 1486 return SourceRange(BuiltinLoc, RParenLoc); 1487 } 1488 static bool classof(const Stmt *T) { 1489 return T->getStmtClass() == ChooseExprClass; 1490 } 1491 static bool classof(const ChooseExpr *) { return true; } 1492 1493 // Iterators 1494 virtual child_iterator child_begin(); 1495 virtual child_iterator child_end(); 1496 1497 virtual void EmitImpl(llvm::Serializer& S) const; 1498 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1499}; 1500 1501/// GNUNullExpr - Implements the GNU __null extension, which is a name 1502/// for a null pointer constant that has integral type (e.g., int or 1503/// long) and is the same size and alignment as a pointer. The __null 1504/// extension is typically only used by system headers, which define 1505/// NULL as __null in C++ rather than using 0 (which is an integer 1506/// that may not match the size of a pointer). 1507class GNUNullExpr : public Expr { 1508 /// TokenLoc - The location of the __null keyword. 1509 SourceLocation TokenLoc; 1510 1511public: 1512 GNUNullExpr(QualType Ty, SourceLocation Loc) 1513 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1514 1515 /// getTokenLocation - The location of the __null token. 1516 SourceLocation getTokenLocation() const { return TokenLoc; } 1517 1518 virtual SourceRange getSourceRange() const { 1519 return SourceRange(TokenLoc); 1520 } 1521 static bool classof(const Stmt *T) { 1522 return T->getStmtClass() == GNUNullExprClass; 1523 } 1524 static bool classof(const GNUNullExpr *) { return true; } 1525 1526 // Iterators 1527 virtual child_iterator child_begin(); 1528 virtual child_iterator child_end(); 1529 1530 virtual void EmitImpl(llvm::Serializer& S) const; 1531 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1532}; 1533 1534/// OverloadExpr - Clang builtin function __builtin_overload. 1535/// This AST node provides a way to overload functions in C. 1536/// 1537/// The first argument is required to be a constant expression, for the number 1538/// of arguments passed to each candidate function. 1539/// 1540/// The next N arguments, where N is the value of the constant expression, 1541/// are the values to be passed as arguments. 1542/// 1543/// The rest of the arguments are values of pointer to function type, which 1544/// are the candidate functions for overloading. 1545/// 1546/// The result is a equivalent to a CallExpr taking N arguments to the 1547/// candidate function whose parameter types match the types of the N arguments. 1548/// 1549/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1550/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1551/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1552class OverloadExpr : public Expr { 1553 // SubExprs - the list of values passed to the __builtin_overload function. 1554 // SubExpr[0] is a constant expression 1555 // SubExpr[1-N] are the parameters to pass to the matching function call 1556 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1557 Stmt **SubExprs; 1558 1559 // NumExprs - the size of the SubExprs array 1560 unsigned NumExprs; 1561 1562 // The index of the matching candidate function 1563 unsigned FnIndex; 1564 1565 SourceLocation BuiltinLoc; 1566 SourceLocation RParenLoc; 1567public: 1568 OverloadExpr(ASTContext& C, Expr **args, unsigned nexprs, unsigned idx, 1569 QualType t, SourceLocation bloc, SourceLocation rploc) 1570 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1571 BuiltinLoc(bloc), RParenLoc(rploc) { 1572 SubExprs = new (C) Stmt*[nexprs]; 1573 for (unsigned i = 0; i != nexprs; ++i) 1574 SubExprs[i] = args[i]; 1575 } 1576 1577 ~OverloadExpr() {} 1578 1579 void Destroy(ASTContext& C); 1580 1581 /// arg_begin - Return a pointer to the list of arguments that will be passed 1582 /// to the matching candidate function, skipping over the initial constant 1583 /// expression. 1584 typedef ConstExprIterator const_arg_iterator; 1585 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1586 const_arg_iterator arg_end(ASTContext& Ctx) const { 1587 return &SubExprs[0]+1+getNumArgs(Ctx); 1588 } 1589 1590 /// getNumArgs - Return the number of arguments to pass to the candidate 1591 /// functions. 1592 unsigned getNumArgs(ASTContext &Ctx) const { 1593 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1594 } 1595 1596 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1597 /// constant expression, the actual arguments passed in, and the function 1598 /// pointers. 1599 unsigned getNumSubExprs() const { return NumExprs; } 1600 1601 /// getExpr - Return the Expr at the specified index. 1602 Expr *getExpr(unsigned Index) const { 1603 assert((Index < NumExprs) && "Arg access out of range!"); 1604 return cast<Expr>(SubExprs[Index]); 1605 } 1606 1607 /// getFn - Return the matching candidate function for this OverloadExpr. 1608 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1609 1610 virtual SourceRange getSourceRange() const { 1611 return SourceRange(BuiltinLoc, RParenLoc); 1612 } 1613 static bool classof(const Stmt *T) { 1614 return T->getStmtClass() == OverloadExprClass; 1615 } 1616 static bool classof(const OverloadExpr *) { return true; } 1617 1618 // Iterators 1619 virtual child_iterator child_begin(); 1620 virtual child_iterator child_end(); 1621 1622 virtual void EmitImpl(llvm::Serializer& S) const; 1623 static OverloadExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1624}; 1625 1626/// VAArgExpr, used for the builtin function __builtin_va_start. 1627class VAArgExpr : public Expr { 1628 Stmt *Val; 1629 SourceLocation BuiltinLoc, RParenLoc; 1630public: 1631 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1632 : Expr(VAArgExprClass, t), 1633 Val(e), 1634 BuiltinLoc(BLoc), 1635 RParenLoc(RPLoc) { } 1636 1637 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1638 Expr *getSubExpr() { return cast<Expr>(Val); } 1639 virtual SourceRange getSourceRange() const { 1640 return SourceRange(BuiltinLoc, RParenLoc); 1641 } 1642 static bool classof(const Stmt *T) { 1643 return T->getStmtClass() == VAArgExprClass; 1644 } 1645 static bool classof(const VAArgExpr *) { return true; } 1646 1647 // Iterators 1648 virtual child_iterator child_begin(); 1649 virtual child_iterator child_end(); 1650 1651 virtual void EmitImpl(llvm::Serializer& S) const; 1652 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1653}; 1654 1655/// @brief Describes an C or C++ initializer list. 1656/// 1657/// InitListExpr describes an initializer list, which can be used to 1658/// initialize objects of different types, including 1659/// struct/class/union types, arrays, and vectors. For example: 1660/// 1661/// @code 1662/// struct foo x = { 1, { 2, 3 } }; 1663/// @endcode 1664/// 1665/// Prior to semantic analysis, an initializer list will represent the 1666/// initializer list as written by the user, but will have the 1667/// placeholder type "void". This initializer list is called the 1668/// syntactic form of the initializer, and may contain C99 designated 1669/// initializers (represented as DesignatedInitExprs), initializations 1670/// of subobject members without explicit braces, and so on. Clients 1671/// interested in the original syntax of the initializer list should 1672/// use the syntactic form of the initializer list. 1673/// 1674/// After semantic analysis, the initializer list will represent the 1675/// semantic form of the initializer, where the initializations of all 1676/// subobjects are made explicit with nested InitListExpr nodes and 1677/// C99 designators have been eliminated by placing the designated 1678/// initializations into the subobject they initialize. Additionally, 1679/// any "holes" in the initialization, where no initializer has been 1680/// specified for a particular subobject, will be replaced with 1681/// implicitly-generated ImplicitValueInitExpr expressions that 1682/// value-initialize the subobjects. Note, however, that the 1683/// initializer lists may still have fewer initializers than there are 1684/// elements to initialize within the object. 1685/// 1686/// Given the semantic form of the initializer list, one can retrieve 1687/// the original syntactic form of that initializer list (if it 1688/// exists) using getSyntacticForm(). Since many initializer lists 1689/// have the same syntactic and semantic forms, getSyntacticForm() may 1690/// return NULL, indicating that the current initializer list also 1691/// serves as its syntactic form. 1692class InitListExpr : public Expr { 1693 std::vector<Stmt *> InitExprs; 1694 SourceLocation LBraceLoc, RBraceLoc; 1695 1696 /// Contains the initializer list that describes the syntactic form 1697 /// written in the source code. 1698 InitListExpr *SyntacticForm; 1699 1700 /// If this initializer list initializes a union, specifies which 1701 /// field within the union will be initialized. 1702 FieldDecl *UnionFieldInit; 1703 1704 /// Whether this initializer list originally had a GNU array-range 1705 /// designator in it. This is a temporary marker used by CodeGen. 1706 bool HadArrayRangeDesignator; 1707 1708public: 1709 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1710 SourceLocation rbraceloc); 1711 1712 unsigned getNumInits() const { return InitExprs.size(); } 1713 1714 const Expr* getInit(unsigned Init) const { 1715 assert(Init < getNumInits() && "Initializer access out of range!"); 1716 return cast_or_null<Expr>(InitExprs[Init]); 1717 } 1718 1719 Expr* getInit(unsigned Init) { 1720 assert(Init < getNumInits() && "Initializer access out of range!"); 1721 return cast_or_null<Expr>(InitExprs[Init]); 1722 } 1723 1724 void setInit(unsigned Init, Expr *expr) { 1725 assert(Init < getNumInits() && "Initializer access out of range!"); 1726 InitExprs[Init] = expr; 1727 } 1728 1729 /// @brief Specify the number of initializers 1730 /// 1731 /// If there are more than @p NumInits initializers, the remaining 1732 /// initializers will be destroyed. If there are fewer than @p 1733 /// NumInits initializers, NULL expressions will be added for the 1734 /// unknown initializers. 1735 void resizeInits(ASTContext &Context, unsigned NumInits); 1736 1737 /// @brief Updates the initializer at index @p Init with the new 1738 /// expression @p expr, and returns the old expression at that 1739 /// location. 1740 /// 1741 /// When @p Init is out of range for this initializer list, the 1742 /// initializer list will be extended with NULL expressions to 1743 /// accomodate the new entry. 1744 Expr *updateInit(unsigned Init, Expr *expr); 1745 1746 /// \brief If this initializes a union, specifies which field in the 1747 /// union to initialize. 1748 /// 1749 /// Typically, this field is the first named field within the 1750 /// union. However, a designated initializer can specify the 1751 /// initialization of a different field within the union. 1752 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1753 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1754 1755 // Explicit InitListExpr's originate from source code (and have valid source 1756 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1757 bool isExplicit() { 1758 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1759 } 1760 1761 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1762 1763 /// @brief Retrieve the initializer list that describes the 1764 /// syntactic form of the initializer. 1765 /// 1766 /// 1767 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1768 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1769 1770 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1771 void sawArrayRangeDesignator() { 1772 HadArrayRangeDesignator = true; 1773 } 1774 1775 virtual SourceRange getSourceRange() const { 1776 return SourceRange(LBraceLoc, RBraceLoc); 1777 } 1778 static bool classof(const Stmt *T) { 1779 return T->getStmtClass() == InitListExprClass; 1780 } 1781 static bool classof(const InitListExpr *) { return true; } 1782 1783 // Iterators 1784 virtual child_iterator child_begin(); 1785 virtual child_iterator child_end(); 1786 1787 typedef std::vector<Stmt *>::iterator iterator; 1788 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1789 1790 iterator begin() { return InitExprs.begin(); } 1791 iterator end() { return InitExprs.end(); } 1792 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1793 reverse_iterator rend() { return InitExprs.rend(); } 1794 1795 // Serailization. 1796 virtual void EmitImpl(llvm::Serializer& S) const; 1797 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1798 1799private: 1800 // Used by serializer. 1801 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1802}; 1803 1804/// @brief Represents a C99 designated initializer expression. 1805/// 1806/// A designated initializer expression (C99 6.7.8) contains one or 1807/// more designators (which can be field designators, array 1808/// designators, or GNU array-range designators) followed by an 1809/// expression that initializes the field or element(s) that the 1810/// designators refer to. For example, given: 1811/// 1812/// @code 1813/// struct point { 1814/// double x; 1815/// double y; 1816/// }; 1817/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1818/// @endcode 1819/// 1820/// The InitListExpr contains three DesignatedInitExprs, the first of 1821/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1822/// designators, one array designator for @c [2] followed by one field 1823/// designator for @c .y. The initalization expression will be 1.0. 1824class DesignatedInitExpr : public Expr { 1825 /// The location of the '=' or ':' prior to the actual initializer 1826 /// expression. 1827 SourceLocation EqualOrColonLoc; 1828 1829 /// Whether this designated initializer used the GNU deprecated ':' 1830 /// syntax rather than the C99 '=' syntax. 1831 bool UsesColonSyntax : 1; 1832 1833 /// The number of designators in this initializer expression. 1834 unsigned NumDesignators : 15; 1835 1836 /// The number of subexpressions of this initializer expression, 1837 /// which contains both the initializer and any additional 1838 /// expressions used by array and array-range designators. 1839 unsigned NumSubExprs : 16; 1840 1841 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1842 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1843 unsigned NumSubExprs) 1844 : Expr(DesignatedInitExprClass, Ty), 1845 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1846 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1847 1848public: 1849 /// A field designator, e.g., ".x". 1850 struct FieldDesignator { 1851 /// Refers to the field that is being initialized. The low bit 1852 /// of this field determines whether this is actually a pointer 1853 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1854 /// initially constructed, a field designator will store an 1855 /// IdentifierInfo*. After semantic analysis has resolved that 1856 /// name, the field designator will instead store a FieldDecl*. 1857 uintptr_t NameOrField; 1858 1859 /// The location of the '.' in the designated initializer. 1860 unsigned DotLoc; 1861 1862 /// The location of the field name in the designated initializer. 1863 unsigned FieldLoc; 1864 }; 1865 1866 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1867 struct ArrayOrRangeDesignator { 1868 /// Location of the first index expression within the designated 1869 /// initializer expression's list of subexpressions. 1870 unsigned Index; 1871 /// The location of the '[' starting the array range designator. 1872 unsigned LBracketLoc; 1873 /// The location of the ellipsis separating the start and end 1874 /// indices. Only valid for GNU array-range designators. 1875 unsigned EllipsisLoc; 1876 /// The location of the ']' terminating the array range designator. 1877 unsigned RBracketLoc; 1878 }; 1879 1880 /// @brief Represents a single C99 designator. 1881 /// 1882 /// @todo This class is infuriatingly similar to clang::Designator, 1883 /// but minor differences (storing indices vs. storing pointers) 1884 /// keep us from reusing it. Try harder, later, to rectify these 1885 /// differences. 1886 class Designator { 1887 /// @brief The kind of designator this describes. 1888 enum { 1889 FieldDesignator, 1890 ArrayDesignator, 1891 ArrayRangeDesignator 1892 } Kind; 1893 1894 union { 1895 /// A field designator, e.g., ".x". 1896 struct FieldDesignator Field; 1897 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1898 struct ArrayOrRangeDesignator ArrayOrRange; 1899 }; 1900 friend class DesignatedInitExpr; 1901 1902 public: 1903 /// @brief Initializes a field designator. 1904 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1905 SourceLocation FieldLoc) 1906 : Kind(FieldDesignator) { 1907 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1908 Field.DotLoc = DotLoc.getRawEncoding(); 1909 Field.FieldLoc = FieldLoc.getRawEncoding(); 1910 } 1911 1912 /// @brief Initializes an array designator. 1913 Designator(unsigned Index, SourceLocation LBracketLoc, 1914 SourceLocation RBracketLoc) 1915 : Kind(ArrayDesignator) { 1916 ArrayOrRange.Index = Index; 1917 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1918 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1919 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1920 } 1921 1922 /// @brief Initializes a GNU array-range designator. 1923 Designator(unsigned Index, SourceLocation LBracketLoc, 1924 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1925 : Kind(ArrayRangeDesignator) { 1926 ArrayOrRange.Index = Index; 1927 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1928 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1929 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1930 } 1931 1932 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1933 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1934 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1935 1936 IdentifierInfo * getFieldName(); 1937 1938 FieldDecl *getField() { 1939 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1940 if (Field.NameOrField & 0x01) 1941 return 0; 1942 else 1943 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1944 } 1945 1946 void setField(FieldDecl *FD) { 1947 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1948 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1949 } 1950 1951 SourceLocation getDotLoc() const { 1952 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1953 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1954 } 1955 1956 SourceLocation getFieldLoc() const { 1957 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1958 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1959 } 1960 1961 SourceLocation getLBracketLoc() const { 1962 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1963 "Only valid on an array or array-range designator"); 1964 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1965 } 1966 1967 SourceLocation getRBracketLoc() const { 1968 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1969 "Only valid on an array or array-range designator"); 1970 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1971 } 1972 1973 SourceLocation getEllipsisLoc() const { 1974 assert(Kind == ArrayRangeDesignator && 1975 "Only valid on an array-range designator"); 1976 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 1977 } 1978 1979 SourceLocation getStartLocation() const { 1980 if (Kind == FieldDesignator) 1981 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 1982 else 1983 return getLBracketLoc(); 1984 } 1985 }; 1986 1987 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 1988 unsigned NumDesignators, 1989 Expr **IndexExprs, unsigned NumIndexExprs, 1990 SourceLocation EqualOrColonLoc, 1991 bool UsesColonSyntax, Expr *Init); 1992 1993 /// @brief Returns the number of designators in this initializer. 1994 unsigned size() const { return NumDesignators; } 1995 1996 // Iterator access to the designators. 1997 typedef Designator* designators_iterator; 1998 designators_iterator designators_begin(); 1999 designators_iterator designators_end(); 2000 2001 Expr *getArrayIndex(const Designator& D); 2002 Expr *getArrayRangeStart(const Designator& D); 2003 Expr *getArrayRangeEnd(const Designator& D); 2004 2005 /// @brief Retrieve the location of the '=' that precedes the 2006 /// initializer value itself, if present. 2007 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2008 2009 /// @brief Determines whether this designated initializer used the 2010 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 2011 bool usesColonSyntax() const { return UsesColonSyntax; } 2012 2013 /// @brief Retrieve the initializer value. 2014 Expr *getInit() const { 2015 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2016 } 2017 2018 void setInit(Expr *init) { 2019 *child_begin() = init; 2020 } 2021 2022 virtual SourceRange getSourceRange() const; 2023 2024 static bool classof(const Stmt *T) { 2025 return T->getStmtClass() == DesignatedInitExprClass; 2026 } 2027 static bool classof(const DesignatedInitExpr *) { return true; } 2028 2029 // Iterators 2030 virtual child_iterator child_begin(); 2031 virtual child_iterator child_end(); 2032}; 2033 2034/// \brief Represents an implicitly-generated value initialization of 2035/// an object of a given type. 2036/// 2037/// Implicit value initializations occur within semantic initializer 2038/// list expressions (InitListExpr) as placeholders for subobject 2039/// initializations not explicitly specified by the user. 2040/// 2041/// \see InitListExpr 2042class ImplicitValueInitExpr : public Expr { 2043public: 2044 explicit ImplicitValueInitExpr(QualType ty) 2045 : Expr(ImplicitValueInitExprClass, ty) { } 2046 2047 static bool classof(const Stmt *T) { 2048 return T->getStmtClass() == ImplicitValueInitExprClass; 2049 } 2050 static bool classof(const ImplicitValueInitExpr *) { return true; } 2051 2052 virtual SourceRange getSourceRange() const { 2053 return SourceRange(); 2054 } 2055 2056 // Iterators 2057 virtual child_iterator child_begin(); 2058 virtual child_iterator child_end(); 2059}; 2060 2061//===----------------------------------------------------------------------===// 2062// Clang Extensions 2063//===----------------------------------------------------------------------===// 2064 2065 2066/// ExtVectorElementExpr - This represents access to specific elements of a 2067/// vector, and may occur on the left hand side or right hand side. For example 2068/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2069/// 2070/// Note that the base may have either vector or pointer to vector type, just 2071/// like a struct field reference. 2072/// 2073class ExtVectorElementExpr : public Expr { 2074 Stmt *Base; 2075 IdentifierInfo &Accessor; 2076 SourceLocation AccessorLoc; 2077public: 2078 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2079 SourceLocation loc) 2080 : Expr(ExtVectorElementExprClass, ty), 2081 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2082 2083 const Expr *getBase() const { return cast<Expr>(Base); } 2084 Expr *getBase() { return cast<Expr>(Base); } 2085 2086 IdentifierInfo &getAccessor() const { return Accessor; } 2087 2088 /// getNumElements - Get the number of components being selected. 2089 unsigned getNumElements() const; 2090 2091 /// containsDuplicateElements - Return true if any element access is 2092 /// repeated. 2093 bool containsDuplicateElements() const; 2094 2095 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2096 /// aggregate Constant of ConstantInt(s). 2097 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2098 2099 virtual SourceRange getSourceRange() const { 2100 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2101 } 2102 2103 /// isArrow - Return true if the base expression is a pointer to vector, 2104 /// return false if the base expression is a vector. 2105 bool isArrow() const; 2106 2107 static bool classof(const Stmt *T) { 2108 return T->getStmtClass() == ExtVectorElementExprClass; 2109 } 2110 static bool classof(const ExtVectorElementExpr *) { return true; } 2111 2112 // Iterators 2113 virtual child_iterator child_begin(); 2114 virtual child_iterator child_end(); 2115 2116 virtual void EmitImpl(llvm::Serializer& S) const; 2117 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2118}; 2119 2120 2121/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2122/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2123class BlockExpr : public Expr { 2124protected: 2125 BlockDecl *TheBlock; 2126public: 2127 BlockExpr(BlockDecl *BD, QualType ty) : Expr(BlockExprClass, ty), 2128 TheBlock(BD) {} 2129 2130 const BlockDecl *getBlockDecl() const { return TheBlock; } 2131 BlockDecl *getBlockDecl() { return TheBlock; } 2132 2133 // Convenience functions for probing the underlying BlockDecl. 2134 SourceLocation getCaretLocation() const; 2135 const Stmt *getBody() const; 2136 Stmt *getBody(); 2137 2138 virtual SourceRange getSourceRange() const { 2139 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2140 } 2141 2142 /// getFunctionType - Return the underlying function type for this block. 2143 const FunctionType *getFunctionType() const; 2144 2145 static bool classof(const Stmt *T) { 2146 return T->getStmtClass() == BlockExprClass; 2147 } 2148 static bool classof(const BlockExpr *) { return true; } 2149 2150 // Iterators 2151 virtual child_iterator child_begin(); 2152 virtual child_iterator child_end(); 2153 2154 virtual void EmitImpl(llvm::Serializer& S) const; 2155 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2156}; 2157 2158/// BlockDeclRefExpr - A reference to a declared variable, function, 2159/// enum, etc. 2160class BlockDeclRefExpr : public Expr { 2161 ValueDecl *D; 2162 SourceLocation Loc; 2163 bool IsByRef; 2164public: 2165 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2166 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2167 2168 ValueDecl *getDecl() { return D; } 2169 const ValueDecl *getDecl() const { return D; } 2170 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2171 2172 bool isByRef() const { return IsByRef; } 2173 2174 static bool classof(const Stmt *T) { 2175 return T->getStmtClass() == BlockDeclRefExprClass; 2176 } 2177 static bool classof(const BlockDeclRefExpr *) { return true; } 2178 2179 // Iterators 2180 virtual child_iterator child_begin(); 2181 virtual child_iterator child_end(); 2182 2183 virtual void EmitImpl(llvm::Serializer& S) const; 2184 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2185}; 2186 2187} // end namespace clang 2188 2189#endif 2190