Expr.h revision aa491196c84d3707be32ad06f19c18bfcfbef21a
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. 479/// 480/// Note that strings in C can be formed by concatenation of multiple string 481/// literal pptokens in trnaslation phase #6. This keeps track of the locations 482/// of each of these pieces. 483class StringLiteral : public Expr { 484 const char *StrData; 485 unsigned ByteLength; 486 bool IsWide; 487 unsigned NumConcatenated; 488 SourceLocation TokLocs[1]; 489 490 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 491public: 492 /// This is the "fully general" constructor that allows representation of 493 /// strings formed from multiple concatenated tokens. 494 static StringLiteral *Create(ASTContext &C, const char *StrData, 495 unsigned ByteLength, bool Wide, QualType Ty, 496 SourceLocation *Loc, unsigned NumStrs); 497 498 /// Simple constructor for string literals made from one token. 499 static StringLiteral *Create(ASTContext &C, const char *StrData, 500 unsigned ByteLength, 501 bool Wide, QualType Ty, SourceLocation Loc) { 502 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 503 } 504 505 void Destroy(ASTContext &C); 506 507 const char *getStrData() const { return StrData; } 508 unsigned getByteLength() const { return ByteLength; } 509 bool isWide() const { return IsWide; } 510 511 /// getNumConcatenated - Get the number of string literal tokens that were 512 /// concatenated in translation phase #6 to form this string literal. 513 unsigned getNumConcatenated() const { return NumConcatenated; } 514 515 SourceLocation getStrTokenLoc(unsigned TokNum) const { 516 assert(TokNum < NumConcatenated && "Invalid tok number"); 517 return TokLocs[TokNum]; 518 } 519 520 virtual SourceRange getSourceRange() const { 521 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 522 } 523 static bool classof(const Stmt *T) { 524 return T->getStmtClass() == StringLiteralClass; 525 } 526 static bool classof(const StringLiteral *) { return true; } 527 528 // Iterators 529 virtual child_iterator child_begin(); 530 virtual child_iterator child_end(); 531 532 virtual void EmitImpl(llvm::Serializer& S) const; 533 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 534}; 535 536/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 537/// AST node is only formed if full location information is requested. 538class ParenExpr : public Expr { 539 SourceLocation L, R; 540 Stmt *Val; 541public: 542 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 543 : Expr(ParenExprClass, val->getType(), 544 val->isTypeDependent(), val->isValueDependent()), 545 L(l), R(r), Val(val) {} 546 547 const Expr *getSubExpr() const { return cast<Expr>(Val); } 548 Expr *getSubExpr() { return cast<Expr>(Val); } 549 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 550 551 static bool classof(const Stmt *T) { 552 return T->getStmtClass() == ParenExprClass; 553 } 554 static bool classof(const ParenExpr *) { return true; } 555 556 // Iterators 557 virtual child_iterator child_begin(); 558 virtual child_iterator child_end(); 559 560 virtual void EmitImpl(llvm::Serializer& S) const; 561 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 562}; 563 564 565/// UnaryOperator - This represents the unary-expression's (except sizeof and 566/// alignof), the postinc/postdec operators from postfix-expression, and various 567/// extensions. 568/// 569/// Notes on various nodes: 570/// 571/// Real/Imag - These return the real/imag part of a complex operand. If 572/// applied to a non-complex value, the former returns its operand and the 573/// later returns zero in the type of the operand. 574/// 575/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 576/// subexpression is a compound literal with the various MemberExpr and 577/// ArraySubscriptExpr's applied to it. 578/// 579class UnaryOperator : public Expr { 580public: 581 // Note that additions to this should also update the StmtVisitor class. 582 enum Opcode { 583 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 584 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 585 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 586 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 587 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 588 Real, Imag, // "__real expr"/"__imag expr" Extension. 589 Extension, // __extension__ marker. 590 OffsetOf // __builtin_offsetof 591 }; 592private: 593 Stmt *Val; 594 Opcode Opc; 595 SourceLocation Loc; 596public: 597 598 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 599 : Expr(UnaryOperatorClass, type, 600 input->isTypeDependent() && opc != OffsetOf, 601 input->isValueDependent()), 602 Val(input), Opc(opc), Loc(l) {} 603 604 Opcode getOpcode() const { return Opc; } 605 Expr *getSubExpr() const { return cast<Expr>(Val); } 606 607 /// getOperatorLoc - Return the location of the operator. 608 SourceLocation getOperatorLoc() const { return Loc; } 609 610 /// isPostfix - Return true if this is a postfix operation, like x++. 611 static bool isPostfix(Opcode Op) { 612 return Op == PostInc || Op == PostDec; 613 } 614 615 /// isPostfix - Return true if this is a prefix operation, like --x. 616 static bool isPrefix(Opcode Op) { 617 return Op == PreInc || Op == PreDec; 618 } 619 620 bool isPrefix() const { return isPrefix(Opc); } 621 bool isPostfix() const { return isPostfix(Opc); } 622 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 623 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 624 bool isOffsetOfOp() const { return Opc == OffsetOf; } 625 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 626 627 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 628 /// corresponds to, e.g. "sizeof" or "[pre]++" 629 static const char *getOpcodeStr(Opcode Op); 630 631 virtual SourceRange getSourceRange() const { 632 if (isPostfix()) 633 return SourceRange(Val->getLocStart(), Loc); 634 else 635 return SourceRange(Loc, Val->getLocEnd()); 636 } 637 virtual SourceLocation getExprLoc() const { return Loc; } 638 639 static bool classof(const Stmt *T) { 640 return T->getStmtClass() == UnaryOperatorClass; 641 } 642 static bool classof(const UnaryOperator *) { return true; } 643 644 int64_t evaluateOffsetOf(ASTContext& C) const; 645 646 // Iterators 647 virtual child_iterator child_begin(); 648 virtual child_iterator child_end(); 649 650 virtual void EmitImpl(llvm::Serializer& S) const; 651 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 652}; 653 654/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 655/// types and expressions. 656class SizeOfAlignOfExpr : public Expr { 657 bool isSizeof : 1; // true if sizeof, false if alignof. 658 bool isType : 1; // true if operand is a type, false if an expression 659 union { 660 void *Ty; 661 Stmt *Ex; 662 } Argument; 663 SourceLocation OpLoc, RParenLoc; 664public: 665 SizeOfAlignOfExpr(bool issizeof, bool istype, void *argument, 666 QualType resultType, SourceLocation op, 667 SourceLocation rp) : 668 Expr(SizeOfAlignOfExprClass, resultType), isSizeof(issizeof), 669 isType(istype), OpLoc(op), RParenLoc(rp) { 670 if (isType) 671 Argument.Ty = argument; 672 else 673 // argument was an Expr*, so cast it back to that to be safe 674 Argument.Ex = static_cast<Expr*>(argument); 675 } 676 677 virtual void Destroy(ASTContext& C); 678 679 bool isSizeOf() const { return isSizeof; } 680 bool isArgumentType() const { return isType; } 681 QualType getArgumentType() const { 682 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 683 return QualType::getFromOpaquePtr(Argument.Ty); 684 } 685 Expr *getArgumentExpr() { 686 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 687 return static_cast<Expr*>(Argument.Ex); 688 } 689 const Expr *getArgumentExpr() const { 690 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 691 } 692 693 /// Gets the argument type, or the type of the argument expression, whichever 694 /// is appropriate. 695 QualType getTypeOfArgument() const { 696 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 697 } 698 699 SourceLocation getOperatorLoc() const { return OpLoc; } 700 701 virtual SourceRange getSourceRange() const { 702 return SourceRange(OpLoc, RParenLoc); 703 } 704 705 static bool classof(const Stmt *T) { 706 return T->getStmtClass() == SizeOfAlignOfExprClass; 707 } 708 static bool classof(const SizeOfAlignOfExpr *) { return true; } 709 710 // Iterators 711 virtual child_iterator child_begin(); 712 virtual child_iterator child_end(); 713 714 virtual void EmitImpl(llvm::Serializer& S) const; 715 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 716}; 717 718//===----------------------------------------------------------------------===// 719// Postfix Operators. 720//===----------------------------------------------------------------------===// 721 722/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 723class ArraySubscriptExpr : public Expr { 724 enum { LHS, RHS, END_EXPR=2 }; 725 Stmt* SubExprs[END_EXPR]; 726 SourceLocation RBracketLoc; 727public: 728 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 729 SourceLocation rbracketloc) 730 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 731 SubExprs[LHS] = lhs; 732 SubExprs[RHS] = rhs; 733 } 734 735 /// An array access can be written A[4] or 4[A] (both are equivalent). 736 /// - getBase() and getIdx() always present the normalized view: A[4]. 737 /// In this case getBase() returns "A" and getIdx() returns "4". 738 /// - getLHS() and getRHS() present the syntactic view. e.g. for 739 /// 4[A] getLHS() returns "4". 740 /// Note: Because vector element access is also written A[4] we must 741 /// predicate the format conversion in getBase and getIdx only on the 742 /// the type of the RHS, as it is possible for the LHS to be a vector of 743 /// integer type 744 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 745 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 746 747 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 748 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 749 750 Expr *getBase() { 751 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 752 } 753 754 const Expr *getBase() const { 755 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 756 } 757 758 Expr *getIdx() { 759 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 760 } 761 762 const Expr *getIdx() const { 763 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 764 } 765 766 virtual SourceRange getSourceRange() const { 767 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 768 } 769 770 SourceLocation getRBracketLoc() const { return RBracketLoc; } 771 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 772 773 static bool classof(const Stmt *T) { 774 return T->getStmtClass() == ArraySubscriptExprClass; 775 } 776 static bool classof(const ArraySubscriptExpr *) { return true; } 777 778 // Iterators 779 virtual child_iterator child_begin(); 780 virtual child_iterator child_end(); 781 782 virtual void EmitImpl(llvm::Serializer& S) const; 783 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 784}; 785 786 787/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 788/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 789/// while its subclasses may represent alternative syntax that (semantically) 790/// results in a function call. For example, CXXOperatorCallExpr is 791/// a subclass for overloaded operator calls that use operator syntax, e.g., 792/// "str1 + str2" to resolve to a function call. 793class CallExpr : public Expr { 794 enum { FN=0, ARGS_START=1 }; 795 Stmt **SubExprs; 796 unsigned NumArgs; 797 SourceLocation RParenLoc; 798 799 // This version of the ctor is for deserialization. 800 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 801 SourceLocation rparenloc) 802 : Expr(SC,t), SubExprs(subexprs), 803 NumArgs(numargs), RParenLoc(rparenloc) {} 804 805protected: 806 // This version of the constructor is for derived classes. 807 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 808 QualType t, SourceLocation rparenloc); 809 810public: 811 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 812 SourceLocation rparenloc); 813 814 ~CallExpr() {} 815 816 void Destroy(ASTContext& C); 817 818 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 819 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 820 void setCallee(Expr *F) { SubExprs[FN] = F; } 821 822 /// getNumArgs - Return the number of actual arguments to this call. 823 /// 824 unsigned getNumArgs() const { return NumArgs; } 825 826 /// getArg - Return the specified argument. 827 Expr *getArg(unsigned Arg) { 828 assert(Arg < NumArgs && "Arg access out of range!"); 829 return cast<Expr>(SubExprs[Arg+ARGS_START]); 830 } 831 const Expr *getArg(unsigned Arg) const { 832 assert(Arg < NumArgs && "Arg access out of range!"); 833 return cast<Expr>(SubExprs[Arg+ARGS_START]); 834 } 835 836 // FIXME: Why is this needed? Why not just create the CallExpr with the 837 // corect number of arguments? It makes the ASTs less brittle. 838 /// setArg - Set the specified argument. 839 void setArg(unsigned Arg, Expr *ArgExpr) { 840 assert(Arg < NumArgs && "Arg access out of range!"); 841 SubExprs[Arg+ARGS_START] = ArgExpr; 842 } 843 844 // FIXME: It would be great to just get rid of this. There is only one 845 // callee of this method, and it probably could be refactored to not use 846 // this method and instead just create a CallExpr with the right number of 847 // arguments. 848 /// setNumArgs - This changes the number of arguments present in this call. 849 /// Any orphaned expressions are deleted by this, and any new operands are set 850 /// to null. 851 void setNumArgs(ASTContext& C, unsigned NumArgs); 852 853 typedef ExprIterator arg_iterator; 854 typedef ConstExprIterator const_arg_iterator; 855 856 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 857 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 858 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 859 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 860 861 /// getNumCommas - Return the number of commas that must have been present in 862 /// this function call. 863 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 864 865 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 866 /// not, return 0. 867 unsigned isBuiltinCall(ASTContext &Context) const; 868 869 SourceLocation getRParenLoc() const { return RParenLoc; } 870 871 virtual SourceRange getSourceRange() const { 872 return SourceRange(getCallee()->getLocStart(), RParenLoc); 873 } 874 875 static bool classof(const Stmt *T) { 876 return T->getStmtClass() == CallExprClass || 877 T->getStmtClass() == CXXOperatorCallExprClass || 878 T->getStmtClass() == CXXMemberCallExprClass; 879 } 880 static bool classof(const CallExpr *) { return true; } 881 static bool classof(const CXXOperatorCallExpr *) { return true; } 882 static bool classof(const CXXMemberCallExpr *) { return true; } 883 884 // Iterators 885 virtual child_iterator child_begin(); 886 virtual child_iterator child_end(); 887 888 virtual void EmitImpl(llvm::Serializer& S) const; 889 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 890 StmtClass SC); 891}; 892 893/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 894/// 895class MemberExpr : public Expr { 896 Stmt *Base; 897 NamedDecl *MemberDecl; 898 SourceLocation MemberLoc; 899 bool IsArrow; // True if this is "X->F", false if this is "X.F". 900public: 901 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 902 QualType ty) 903 : Expr(MemberExprClass, ty), 904 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 905 906 void setBase(Expr *E) { Base = E; } 907 Expr *getBase() const { return cast<Expr>(Base); } 908 NamedDecl *getMemberDecl() const { return MemberDecl; } 909 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 910 bool isArrow() const { return IsArrow; } 911 SourceLocation getMemberLoc() const { return MemberLoc; } 912 913 virtual SourceRange getSourceRange() const { 914 return SourceRange(getBase()->getLocStart(), MemberLoc); 915 } 916 917 virtual SourceLocation getExprLoc() const { return MemberLoc; } 918 919 static bool classof(const Stmt *T) { 920 return T->getStmtClass() == MemberExprClass; 921 } 922 static bool classof(const MemberExpr *) { return true; } 923 924 // Iterators 925 virtual child_iterator child_begin(); 926 virtual child_iterator child_end(); 927 928 virtual void EmitImpl(llvm::Serializer& S) const; 929 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 930}; 931 932/// CompoundLiteralExpr - [C99 6.5.2.5] 933/// 934class CompoundLiteralExpr : public Expr { 935 /// LParenLoc - If non-null, this is the location of the left paren in a 936 /// compound literal like "(int){4}". This can be null if this is a 937 /// synthesized compound expression. 938 SourceLocation LParenLoc; 939 Stmt *Init; 940 bool FileScope; 941public: 942 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 943 bool fileScope) 944 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 945 FileScope(fileScope) {} 946 947 const Expr *getInitializer() const { return cast<Expr>(Init); } 948 Expr *getInitializer() { return cast<Expr>(Init); } 949 950 bool isFileScope() const { return FileScope; } 951 952 SourceLocation getLParenLoc() const { return LParenLoc; } 953 954 virtual SourceRange getSourceRange() const { 955 // FIXME: Init should never be null. 956 if (!Init) 957 return SourceRange(); 958 if (LParenLoc.isInvalid()) 959 return Init->getSourceRange(); 960 return SourceRange(LParenLoc, Init->getLocEnd()); 961 } 962 963 static bool classof(const Stmt *T) { 964 return T->getStmtClass() == CompoundLiteralExprClass; 965 } 966 static bool classof(const CompoundLiteralExpr *) { return true; } 967 968 // Iterators 969 virtual child_iterator child_begin(); 970 virtual child_iterator child_end(); 971 972 virtual void EmitImpl(llvm::Serializer& S) const; 973 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 974}; 975 976/// CastExpr - Base class for type casts, including both implicit 977/// casts (ImplicitCastExpr) and explicit casts that have some 978/// representation in the source code (ExplicitCastExpr's derived 979/// classes). 980class CastExpr : public Expr { 981 Stmt *Op; 982protected: 983 CastExpr(StmtClass SC, QualType ty, Expr *op) : 984 Expr(SC, ty, 985 // Cast expressions are type-dependent if the type is 986 // dependent (C++ [temp.dep.expr]p3). 987 ty->isDependentType(), 988 // Cast expressions are value-dependent if the type is 989 // dependent or if the subexpression is value-dependent. 990 ty->isDependentType() || (op && op->isValueDependent())), 991 Op(op) {} 992 993public: 994 Expr *getSubExpr() { return cast<Expr>(Op); } 995 const Expr *getSubExpr() const { return cast<Expr>(Op); } 996 997 static bool classof(const Stmt *T) { 998 StmtClass SC = T->getStmtClass(); 999 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1000 return true; 1001 1002 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1003 return true; 1004 1005 return false; 1006 } 1007 static bool classof(const CastExpr *) { return true; } 1008 1009 // Iterators 1010 virtual child_iterator child_begin(); 1011 virtual child_iterator child_end(); 1012}; 1013 1014/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1015/// conversions, which have no direct representation in the original 1016/// source code. For example: converting T[]->T*, void f()->void 1017/// (*f)(), float->double, short->int, etc. 1018/// 1019/// In C, implicit casts always produce rvalues. However, in C++, an 1020/// implicit cast whose result is being bound to a reference will be 1021/// an lvalue. For example: 1022/// 1023/// @code 1024/// class Base { }; 1025/// class Derived : public Base { }; 1026/// void f(Derived d) { 1027/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1028/// } 1029/// @endcode 1030class ImplicitCastExpr : public CastExpr { 1031 /// LvalueCast - Whether this cast produces an lvalue. 1032 bool LvalueCast; 1033 1034public: 1035 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1036 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1037 1038 virtual SourceRange getSourceRange() const { 1039 return getSubExpr()->getSourceRange(); 1040 } 1041 1042 /// isLvalueCast - Whether this cast produces an lvalue. 1043 bool isLvalueCast() const { return LvalueCast; } 1044 1045 /// setLvalueCast - Set whether this cast produces an lvalue. 1046 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1047 1048 static bool classof(const Stmt *T) { 1049 return T->getStmtClass() == ImplicitCastExprClass; 1050 } 1051 static bool classof(const ImplicitCastExpr *) { return true; } 1052 1053 virtual void EmitImpl(llvm::Serializer& S) const; 1054 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1055}; 1056 1057/// ExplicitCastExpr - An explicit cast written in the source 1058/// code. 1059/// 1060/// This class is effectively an abstract class, because it provides 1061/// the basic representation of an explicitly-written cast without 1062/// specifying which kind of cast (C cast, functional cast, static 1063/// cast, etc.) was written; specific derived classes represent the 1064/// particular style of cast and its location information. 1065/// 1066/// Unlike implicit casts, explicit cast nodes have two different 1067/// types: the type that was written into the source code, and the 1068/// actual type of the expression as determined by semantic 1069/// analysis. These types may differ slightly. For example, in C++ one 1070/// can cast to a reference type, which indicates that the resulting 1071/// expression will be an lvalue. The reference type, however, will 1072/// not be used as the type of the expression. 1073class ExplicitCastExpr : public CastExpr { 1074 /// TypeAsWritten - The type that this expression is casting to, as 1075 /// written in the source code. 1076 QualType TypeAsWritten; 1077 1078protected: 1079 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1080 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1081 1082public: 1083 /// getTypeAsWritten - Returns the type that this expression is 1084 /// casting to, as written in the source code. 1085 QualType getTypeAsWritten() const { return TypeAsWritten; } 1086 1087 static bool classof(const Stmt *T) { 1088 StmtClass SC = T->getStmtClass(); 1089 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1090 return true; 1091 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1092 return true; 1093 1094 return false; 1095 } 1096 static bool classof(const ExplicitCastExpr *) { return true; } 1097}; 1098 1099/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1100/// cast in C++ (C++ [expr.cast]), which uses the syntax 1101/// (Type)expr. For example: @c (int)f. 1102class CStyleCastExpr : public ExplicitCastExpr { 1103 SourceLocation LPLoc; // the location of the left paren 1104 SourceLocation RPLoc; // the location of the right paren 1105public: 1106 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1107 SourceLocation l, SourceLocation r) : 1108 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1109 LPLoc(l), RPLoc(r) {} 1110 1111 SourceLocation getLParenLoc() const { return LPLoc; } 1112 SourceLocation getRParenLoc() const { return RPLoc; } 1113 1114 virtual SourceRange getSourceRange() const { 1115 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1116 } 1117 static bool classof(const Stmt *T) { 1118 return T->getStmtClass() == CStyleCastExprClass; 1119 } 1120 static bool classof(const CStyleCastExpr *) { return true; } 1121 1122 virtual void EmitImpl(llvm::Serializer& S) const; 1123 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1124}; 1125 1126class BinaryOperator : public Expr { 1127public: 1128 enum Opcode { 1129 // Operators listed in order of precedence. 1130 // Note that additions to this should also update the StmtVisitor class. 1131 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1132 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1133 Add, Sub, // [C99 6.5.6] Additive operators. 1134 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1135 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1136 EQ, NE, // [C99 6.5.9] Equality operators. 1137 And, // [C99 6.5.10] Bitwise AND operator. 1138 Xor, // [C99 6.5.11] Bitwise XOR operator. 1139 Or, // [C99 6.5.12] Bitwise OR operator. 1140 LAnd, // [C99 6.5.13] Logical AND operator. 1141 LOr, // [C99 6.5.14] Logical OR operator. 1142 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1143 DivAssign, RemAssign, 1144 AddAssign, SubAssign, 1145 ShlAssign, ShrAssign, 1146 AndAssign, XorAssign, 1147 OrAssign, 1148 Comma // [C99 6.5.17] Comma operator. 1149 }; 1150private: 1151 enum { LHS, RHS, END_EXPR }; 1152 Stmt* SubExprs[END_EXPR]; 1153 Opcode Opc; 1154 SourceLocation OpLoc; 1155public: 1156 1157 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1158 SourceLocation opLoc) 1159 : Expr(BinaryOperatorClass, ResTy, 1160 lhs->isTypeDependent() || rhs->isTypeDependent(), 1161 lhs->isValueDependent() || rhs->isValueDependent()), 1162 Opc(opc), OpLoc(opLoc) { 1163 SubExprs[LHS] = lhs; 1164 SubExprs[RHS] = rhs; 1165 assert(!isCompoundAssignmentOp() && 1166 "Use ArithAssignBinaryOperator for compound assignments"); 1167 } 1168 1169 SourceLocation getOperatorLoc() const { return OpLoc; } 1170 Opcode getOpcode() const { return Opc; } 1171 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1172 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1173 virtual SourceRange getSourceRange() const { 1174 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1175 } 1176 1177 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1178 /// corresponds to, e.g. "<<=". 1179 static const char *getOpcodeStr(Opcode Op); 1180 1181 /// predicates to categorize the respective opcodes. 1182 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1183 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1184 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1185 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1186 1187 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1188 bool isRelationalOp() const { return isRelationalOp(Opc); } 1189 1190 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1191 bool isEqualityOp() const { return isEqualityOp(Opc); } 1192 1193 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1194 bool isLogicalOp() const { return isLogicalOp(Opc); } 1195 1196 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1197 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1198 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1199 1200 static bool classof(const Stmt *S) { 1201 return S->getStmtClass() == BinaryOperatorClass || 1202 S->getStmtClass() == CompoundAssignOperatorClass; 1203 } 1204 static bool classof(const BinaryOperator *) { return true; } 1205 1206 // Iterators 1207 virtual child_iterator child_begin(); 1208 virtual child_iterator child_end(); 1209 1210 virtual void EmitImpl(llvm::Serializer& S) const; 1211 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1212 1213protected: 1214 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1215 SourceLocation oploc, bool dead) 1216 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1217 SubExprs[LHS] = lhs; 1218 SubExprs[RHS] = rhs; 1219 } 1220}; 1221 1222/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1223/// track of the type the operation is performed in. Due to the semantics of 1224/// these operators, the operands are promoted, the aritmetic performed, an 1225/// implicit conversion back to the result type done, then the assignment takes 1226/// place. This captures the intermediate type which the computation is done 1227/// in. 1228class CompoundAssignOperator : public BinaryOperator { 1229 QualType ComputationType; 1230public: 1231 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1232 QualType ResType, QualType CompType, 1233 SourceLocation OpLoc) 1234 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1235 ComputationType(CompType) { 1236 assert(isCompoundAssignmentOp() && 1237 "Only should be used for compound assignments"); 1238 } 1239 1240 QualType getComputationType() const { return ComputationType; } 1241 1242 static bool classof(const CompoundAssignOperator *) { return true; } 1243 static bool classof(const Stmt *S) { 1244 return S->getStmtClass() == CompoundAssignOperatorClass; 1245 } 1246 1247 virtual void EmitImpl(llvm::Serializer& S) const; 1248 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1249 ASTContext& C); 1250}; 1251 1252/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1253/// GNU "missing LHS" extension is in use. 1254/// 1255class ConditionalOperator : public Expr { 1256 enum { COND, LHS, RHS, END_EXPR }; 1257 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1258public: 1259 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1260 : Expr(ConditionalOperatorClass, t, 1261 // FIXME: the type of the conditional operator doesn't 1262 // depend on the type of the conditional, but the standard 1263 // seems to imply that it could. File a bug! 1264 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1265 (cond->isValueDependent() || 1266 (lhs && lhs->isValueDependent()) || 1267 (rhs && rhs->isValueDependent()))) { 1268 SubExprs[COND] = cond; 1269 SubExprs[LHS] = lhs; 1270 SubExprs[RHS] = rhs; 1271 } 1272 1273 // getCond - Return the expression representing the condition for 1274 // the ?: operator. 1275 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1276 1277 // getTrueExpr - Return the subexpression representing the value of the ?: 1278 // expression if the condition evaluates to true. In most cases this value 1279 // will be the same as getLHS() except a GCC extension allows the left 1280 // subexpression to be omitted, and instead of the condition be returned. 1281 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1282 // is only evaluated once. 1283 Expr *getTrueExpr() const { 1284 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1285 } 1286 1287 // getTrueExpr - Return the subexpression representing the value of the ?: 1288 // expression if the condition evaluates to false. This is the same as getRHS. 1289 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1290 1291 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1292 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1293 1294 virtual SourceRange getSourceRange() const { 1295 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1296 } 1297 static bool classof(const Stmt *T) { 1298 return T->getStmtClass() == ConditionalOperatorClass; 1299 } 1300 static bool classof(const ConditionalOperator *) { return true; } 1301 1302 // Iterators 1303 virtual child_iterator child_begin(); 1304 virtual child_iterator child_end(); 1305 1306 virtual void EmitImpl(llvm::Serializer& S) const; 1307 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1308}; 1309 1310/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1311class AddrLabelExpr : public Expr { 1312 SourceLocation AmpAmpLoc, LabelLoc; 1313 LabelStmt *Label; 1314public: 1315 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1316 QualType t) 1317 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1318 1319 virtual SourceRange getSourceRange() const { 1320 return SourceRange(AmpAmpLoc, LabelLoc); 1321 } 1322 1323 LabelStmt *getLabel() const { return Label; } 1324 1325 static bool classof(const Stmt *T) { 1326 return T->getStmtClass() == AddrLabelExprClass; 1327 } 1328 static bool classof(const AddrLabelExpr *) { return true; } 1329 1330 // Iterators 1331 virtual child_iterator child_begin(); 1332 virtual child_iterator child_end(); 1333 1334 virtual void EmitImpl(llvm::Serializer& S) const; 1335 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1336}; 1337 1338/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1339/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1340/// takes the value of the last subexpression. 1341class StmtExpr : public Expr { 1342 Stmt *SubStmt; 1343 SourceLocation LParenLoc, RParenLoc; 1344public: 1345 StmtExpr(CompoundStmt *substmt, QualType T, 1346 SourceLocation lp, SourceLocation rp) : 1347 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1348 1349 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1350 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1351 1352 virtual SourceRange getSourceRange() const { 1353 return SourceRange(LParenLoc, RParenLoc); 1354 } 1355 1356 SourceLocation getLParenLoc() const { return LParenLoc; } 1357 SourceLocation getRParenLoc() const { return RParenLoc; } 1358 1359 static bool classof(const Stmt *T) { 1360 return T->getStmtClass() == StmtExprClass; 1361 } 1362 static bool classof(const StmtExpr *) { return true; } 1363 1364 // Iterators 1365 virtual child_iterator child_begin(); 1366 virtual child_iterator child_end(); 1367 1368 virtual void EmitImpl(llvm::Serializer& S) const; 1369 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1370}; 1371 1372/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1373/// This AST node represents a function that returns 1 if two *types* (not 1374/// expressions) are compatible. The result of this built-in function can be 1375/// used in integer constant expressions. 1376class TypesCompatibleExpr : public Expr { 1377 QualType Type1; 1378 QualType Type2; 1379 SourceLocation BuiltinLoc, RParenLoc; 1380public: 1381 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1382 QualType t1, QualType t2, SourceLocation RP) : 1383 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1384 BuiltinLoc(BLoc), RParenLoc(RP) {} 1385 1386 QualType getArgType1() const { return Type1; } 1387 QualType getArgType2() const { return Type2; } 1388 1389 virtual SourceRange getSourceRange() const { 1390 return SourceRange(BuiltinLoc, RParenLoc); 1391 } 1392 static bool classof(const Stmt *T) { 1393 return T->getStmtClass() == TypesCompatibleExprClass; 1394 } 1395 static bool classof(const TypesCompatibleExpr *) { return true; } 1396 1397 // Iterators 1398 virtual child_iterator child_begin(); 1399 virtual child_iterator child_end(); 1400 1401 virtual void EmitImpl(llvm::Serializer& S) const; 1402 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1403}; 1404 1405/// ShuffleVectorExpr - clang-specific builtin-in function 1406/// __builtin_shufflevector. 1407/// This AST node represents a operator that does a constant 1408/// shuffle, similar to LLVM's shufflevector instruction. It takes 1409/// two vectors and a variable number of constant indices, 1410/// and returns the appropriately shuffled vector. 1411class ShuffleVectorExpr : public Expr { 1412 SourceLocation BuiltinLoc, RParenLoc; 1413 1414 // SubExprs - the list of values passed to the __builtin_shufflevector 1415 // function. The first two are vectors, and the rest are constant 1416 // indices. The number of values in this list is always 1417 // 2+the number of indices in the vector type. 1418 Stmt **SubExprs; 1419 unsigned NumExprs; 1420 1421public: 1422 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1423 QualType Type, SourceLocation BLoc, 1424 SourceLocation RP) : 1425 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1426 RParenLoc(RP), NumExprs(nexpr) { 1427 1428 SubExprs = new Stmt*[nexpr]; 1429 for (unsigned i = 0; i < nexpr; i++) 1430 SubExprs[i] = args[i]; 1431 } 1432 1433 virtual SourceRange getSourceRange() const { 1434 return SourceRange(BuiltinLoc, RParenLoc); 1435 } 1436 static bool classof(const Stmt *T) { 1437 return T->getStmtClass() == ShuffleVectorExprClass; 1438 } 1439 static bool classof(const ShuffleVectorExpr *) { return true; } 1440 1441 ~ShuffleVectorExpr() { 1442 delete [] SubExprs; 1443 } 1444 1445 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1446 /// constant expression, the actual arguments passed in, and the function 1447 /// pointers. 1448 unsigned getNumSubExprs() const { return NumExprs; } 1449 1450 /// getExpr - Return the Expr at the specified index. 1451 Expr *getExpr(unsigned Index) { 1452 assert((Index < NumExprs) && "Arg access out of range!"); 1453 return cast<Expr>(SubExprs[Index]); 1454 } 1455 const Expr *getExpr(unsigned Index) const { 1456 assert((Index < NumExprs) && "Arg access out of range!"); 1457 return cast<Expr>(SubExprs[Index]); 1458 } 1459 1460 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1461 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1462 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1463 } 1464 1465 // Iterators 1466 virtual child_iterator child_begin(); 1467 virtual child_iterator child_end(); 1468 1469 virtual void EmitImpl(llvm::Serializer& S) const; 1470 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1471}; 1472 1473/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1474/// This AST node is similar to the conditional operator (?:) in C, with 1475/// the following exceptions: 1476/// - the test expression must be a constant expression. 1477/// - the expression returned has it's type unaltered by promotion rules. 1478/// - does not evaluate the expression that was not chosen. 1479class ChooseExpr : public Expr { 1480 enum { COND, LHS, RHS, END_EXPR }; 1481 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1482 SourceLocation BuiltinLoc, RParenLoc; 1483public: 1484 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1485 SourceLocation RP) 1486 : Expr(ChooseExprClass, t), 1487 BuiltinLoc(BLoc), RParenLoc(RP) { 1488 SubExprs[COND] = cond; 1489 SubExprs[LHS] = lhs; 1490 SubExprs[RHS] = rhs; 1491 } 1492 1493 /// isConditionTrue - Return true if the condition is true. This is always 1494 /// statically knowable for a well-formed choosexpr. 1495 bool isConditionTrue(ASTContext &C) const; 1496 1497 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1498 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1499 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1500 1501 virtual SourceRange getSourceRange() const { 1502 return SourceRange(BuiltinLoc, RParenLoc); 1503 } 1504 static bool classof(const Stmt *T) { 1505 return T->getStmtClass() == ChooseExprClass; 1506 } 1507 static bool classof(const ChooseExpr *) { return true; } 1508 1509 // Iterators 1510 virtual child_iterator child_begin(); 1511 virtual child_iterator child_end(); 1512 1513 virtual void EmitImpl(llvm::Serializer& S) const; 1514 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1515}; 1516 1517/// GNUNullExpr - Implements the GNU __null extension, which is a name 1518/// for a null pointer constant that has integral type (e.g., int or 1519/// long) and is the same size and alignment as a pointer. The __null 1520/// extension is typically only used by system headers, which define 1521/// NULL as __null in C++ rather than using 0 (which is an integer 1522/// that may not match the size of a pointer). 1523class GNUNullExpr : public Expr { 1524 /// TokenLoc - The location of the __null keyword. 1525 SourceLocation TokenLoc; 1526 1527public: 1528 GNUNullExpr(QualType Ty, SourceLocation Loc) 1529 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1530 1531 /// getTokenLocation - The location of the __null token. 1532 SourceLocation getTokenLocation() const { return TokenLoc; } 1533 1534 virtual SourceRange getSourceRange() const { 1535 return SourceRange(TokenLoc); 1536 } 1537 static bool classof(const Stmt *T) { 1538 return T->getStmtClass() == GNUNullExprClass; 1539 } 1540 static bool classof(const GNUNullExpr *) { return true; } 1541 1542 // Iterators 1543 virtual child_iterator child_begin(); 1544 virtual child_iterator child_end(); 1545 1546 virtual void EmitImpl(llvm::Serializer& S) const; 1547 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1548}; 1549 1550/// OverloadExpr - Clang builtin function __builtin_overload. 1551/// This AST node provides a way to overload functions in C. 1552/// 1553/// The first argument is required to be a constant expression, for the number 1554/// of arguments passed to each candidate function. 1555/// 1556/// The next N arguments, where N is the value of the constant expression, 1557/// are the values to be passed as arguments. 1558/// 1559/// The rest of the arguments are values of pointer to function type, which 1560/// are the candidate functions for overloading. 1561/// 1562/// The result is a equivalent to a CallExpr taking N arguments to the 1563/// candidate function whose parameter types match the types of the N arguments. 1564/// 1565/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1566/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1567/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1568class OverloadExpr : public Expr { 1569 // SubExprs - the list of values passed to the __builtin_overload function. 1570 // SubExpr[0] is a constant expression 1571 // SubExpr[1-N] are the parameters to pass to the matching function call 1572 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1573 Stmt **SubExprs; 1574 1575 // NumExprs - the size of the SubExprs array 1576 unsigned NumExprs; 1577 1578 // The index of the matching candidate function 1579 unsigned FnIndex; 1580 1581 SourceLocation BuiltinLoc; 1582 SourceLocation RParenLoc; 1583public: 1584 OverloadExpr(ASTContext& C, Expr **args, unsigned nexprs, unsigned idx, 1585 QualType t, SourceLocation bloc, SourceLocation rploc) 1586 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1587 BuiltinLoc(bloc), RParenLoc(rploc) { 1588 SubExprs = new (C) Stmt*[nexprs]; 1589 for (unsigned i = 0; i != nexprs; ++i) 1590 SubExprs[i] = args[i]; 1591 } 1592 1593 ~OverloadExpr() {} 1594 1595 void Destroy(ASTContext& C); 1596 1597 /// arg_begin - Return a pointer to the list of arguments that will be passed 1598 /// to the matching candidate function, skipping over the initial constant 1599 /// expression. 1600 typedef ConstExprIterator const_arg_iterator; 1601 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1602 const_arg_iterator arg_end(ASTContext& Ctx) const { 1603 return &SubExprs[0]+1+getNumArgs(Ctx); 1604 } 1605 1606 /// getNumArgs - Return the number of arguments to pass to the candidate 1607 /// functions. 1608 unsigned getNumArgs(ASTContext &Ctx) const { 1609 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1610 } 1611 1612 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1613 /// constant expression, the actual arguments passed in, and the function 1614 /// pointers. 1615 unsigned getNumSubExprs() const { return NumExprs; } 1616 1617 /// getExpr - Return the Expr at the specified index. 1618 Expr *getExpr(unsigned Index) const { 1619 assert((Index < NumExprs) && "Arg access out of range!"); 1620 return cast<Expr>(SubExprs[Index]); 1621 } 1622 1623 /// getFn - Return the matching candidate function for this OverloadExpr. 1624 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1625 1626 virtual SourceRange getSourceRange() const { 1627 return SourceRange(BuiltinLoc, RParenLoc); 1628 } 1629 static bool classof(const Stmt *T) { 1630 return T->getStmtClass() == OverloadExprClass; 1631 } 1632 static bool classof(const OverloadExpr *) { return true; } 1633 1634 // Iterators 1635 virtual child_iterator child_begin(); 1636 virtual child_iterator child_end(); 1637 1638 virtual void EmitImpl(llvm::Serializer& S) const; 1639 static OverloadExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1640}; 1641 1642/// VAArgExpr, used for the builtin function __builtin_va_start. 1643class VAArgExpr : public Expr { 1644 Stmt *Val; 1645 SourceLocation BuiltinLoc, RParenLoc; 1646public: 1647 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1648 : Expr(VAArgExprClass, t), 1649 Val(e), 1650 BuiltinLoc(BLoc), 1651 RParenLoc(RPLoc) { } 1652 1653 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1654 Expr *getSubExpr() { return cast<Expr>(Val); } 1655 virtual SourceRange getSourceRange() const { 1656 return SourceRange(BuiltinLoc, RParenLoc); 1657 } 1658 static bool classof(const Stmt *T) { 1659 return T->getStmtClass() == VAArgExprClass; 1660 } 1661 static bool classof(const VAArgExpr *) { return true; } 1662 1663 // Iterators 1664 virtual child_iterator child_begin(); 1665 virtual child_iterator child_end(); 1666 1667 virtual void EmitImpl(llvm::Serializer& S) const; 1668 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1669}; 1670 1671/// @brief Describes an C or C++ initializer list. 1672/// 1673/// InitListExpr describes an initializer list, which can be used to 1674/// initialize objects of different types, including 1675/// struct/class/union types, arrays, and vectors. For example: 1676/// 1677/// @code 1678/// struct foo x = { 1, { 2, 3 } }; 1679/// @endcode 1680/// 1681/// Prior to semantic analysis, an initializer list will represent the 1682/// initializer list as written by the user, but will have the 1683/// placeholder type "void". This initializer list is called the 1684/// syntactic form of the initializer, and may contain C99 designated 1685/// initializers (represented as DesignatedInitExprs), initializations 1686/// of subobject members without explicit braces, and so on. Clients 1687/// interested in the original syntax of the initializer list should 1688/// use the syntactic form of the initializer list. 1689/// 1690/// After semantic analysis, the initializer list will represent the 1691/// semantic form of the initializer, where the initializations of all 1692/// subobjects are made explicit with nested InitListExpr nodes and 1693/// C99 designators have been eliminated by placing the designated 1694/// initializations into the subobject they initialize. Additionally, 1695/// any "holes" in the initialization, where no initializer has been 1696/// specified for a particular subobject, will be replaced with 1697/// implicitly-generated ImplicitValueInitExpr expressions that 1698/// value-initialize the subobjects. Note, however, that the 1699/// initializer lists may still have fewer initializers than there are 1700/// elements to initialize within the object. 1701/// 1702/// Given the semantic form of the initializer list, one can retrieve 1703/// the original syntactic form of that initializer list (if it 1704/// exists) using getSyntacticForm(). Since many initializer lists 1705/// have the same syntactic and semantic forms, getSyntacticForm() may 1706/// return NULL, indicating that the current initializer list also 1707/// serves as its syntactic form. 1708class InitListExpr : public Expr { 1709 std::vector<Stmt *> InitExprs; 1710 SourceLocation LBraceLoc, RBraceLoc; 1711 1712 /// Contains the initializer list that describes the syntactic form 1713 /// written in the source code. 1714 InitListExpr *SyntacticForm; 1715 1716 /// If this initializer list initializes a union, specifies which 1717 /// field within the union will be initialized. 1718 FieldDecl *UnionFieldInit; 1719 1720 /// Whether this initializer list originally had a GNU array-range 1721 /// designator in it. This is a temporary marker used by CodeGen. 1722 bool HadArrayRangeDesignator; 1723 1724public: 1725 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1726 SourceLocation rbraceloc); 1727 1728 unsigned getNumInits() const { return InitExprs.size(); } 1729 1730 const Expr* getInit(unsigned Init) const { 1731 assert(Init < getNumInits() && "Initializer access out of range!"); 1732 return cast_or_null<Expr>(InitExprs[Init]); 1733 } 1734 1735 Expr* getInit(unsigned Init) { 1736 assert(Init < getNumInits() && "Initializer access out of range!"); 1737 return cast_or_null<Expr>(InitExprs[Init]); 1738 } 1739 1740 void setInit(unsigned Init, Expr *expr) { 1741 assert(Init < getNumInits() && "Initializer access out of range!"); 1742 InitExprs[Init] = expr; 1743 } 1744 1745 /// @brief Specify the number of initializers 1746 /// 1747 /// If there are more than @p NumInits initializers, the remaining 1748 /// initializers will be destroyed. If there are fewer than @p 1749 /// NumInits initializers, NULL expressions will be added for the 1750 /// unknown initializers. 1751 void resizeInits(ASTContext &Context, unsigned NumInits); 1752 1753 /// @brief Updates the initializer at index @p Init with the new 1754 /// expression @p expr, and returns the old expression at that 1755 /// location. 1756 /// 1757 /// When @p Init is out of range for this initializer list, the 1758 /// initializer list will be extended with NULL expressions to 1759 /// accomodate the new entry. 1760 Expr *updateInit(unsigned Init, Expr *expr); 1761 1762 /// \brief If this initializes a union, specifies which field in the 1763 /// union to initialize. 1764 /// 1765 /// Typically, this field is the first named field within the 1766 /// union. However, a designated initializer can specify the 1767 /// initialization of a different field within the union. 1768 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1769 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1770 1771 // Explicit InitListExpr's originate from source code (and have valid source 1772 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1773 bool isExplicit() { 1774 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1775 } 1776 1777 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1778 1779 /// @brief Retrieve the initializer list that describes the 1780 /// syntactic form of the initializer. 1781 /// 1782 /// 1783 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1784 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1785 1786 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1787 void sawArrayRangeDesignator() { 1788 HadArrayRangeDesignator = true; 1789 } 1790 1791 virtual SourceRange getSourceRange() const { 1792 return SourceRange(LBraceLoc, RBraceLoc); 1793 } 1794 static bool classof(const Stmt *T) { 1795 return T->getStmtClass() == InitListExprClass; 1796 } 1797 static bool classof(const InitListExpr *) { return true; } 1798 1799 // Iterators 1800 virtual child_iterator child_begin(); 1801 virtual child_iterator child_end(); 1802 1803 typedef std::vector<Stmt *>::iterator iterator; 1804 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1805 1806 iterator begin() { return InitExprs.begin(); } 1807 iterator end() { return InitExprs.end(); } 1808 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1809 reverse_iterator rend() { return InitExprs.rend(); } 1810 1811 // Serailization. 1812 virtual void EmitImpl(llvm::Serializer& S) const; 1813 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1814 1815private: 1816 // Used by serializer. 1817 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1818}; 1819 1820/// @brief Represents a C99 designated initializer expression. 1821/// 1822/// A designated initializer expression (C99 6.7.8) contains one or 1823/// more designators (which can be field designators, array 1824/// designators, or GNU array-range designators) followed by an 1825/// expression that initializes the field or element(s) that the 1826/// designators refer to. For example, given: 1827/// 1828/// @code 1829/// struct point { 1830/// double x; 1831/// double y; 1832/// }; 1833/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1834/// @endcode 1835/// 1836/// The InitListExpr contains three DesignatedInitExprs, the first of 1837/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1838/// designators, one array designator for @c [2] followed by one field 1839/// designator for @c .y. The initalization expression will be 1.0. 1840class DesignatedInitExpr : public Expr { 1841 /// The location of the '=' or ':' prior to the actual initializer 1842 /// expression. 1843 SourceLocation EqualOrColonLoc; 1844 1845 /// Whether this designated initializer used the GNU deprecated ':' 1846 /// syntax rather than the C99 '=' syntax. 1847 bool UsesColonSyntax : 1; 1848 1849 /// The number of designators in this initializer expression. 1850 unsigned NumDesignators : 15; 1851 1852 /// The number of subexpressions of this initializer expression, 1853 /// which contains both the initializer and any additional 1854 /// expressions used by array and array-range designators. 1855 unsigned NumSubExprs : 16; 1856 1857 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1858 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1859 unsigned NumSubExprs) 1860 : Expr(DesignatedInitExprClass, Ty), 1861 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1862 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1863 1864public: 1865 /// A field designator, e.g., ".x". 1866 struct FieldDesignator { 1867 /// Refers to the field that is being initialized. The low bit 1868 /// of this field determines whether this is actually a pointer 1869 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1870 /// initially constructed, a field designator will store an 1871 /// IdentifierInfo*. After semantic analysis has resolved that 1872 /// name, the field designator will instead store a FieldDecl*. 1873 uintptr_t NameOrField; 1874 1875 /// The location of the '.' in the designated initializer. 1876 unsigned DotLoc; 1877 1878 /// The location of the field name in the designated initializer. 1879 unsigned FieldLoc; 1880 }; 1881 1882 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1883 struct ArrayOrRangeDesignator { 1884 /// Location of the first index expression within the designated 1885 /// initializer expression's list of subexpressions. 1886 unsigned Index; 1887 /// The location of the '[' starting the array range designator. 1888 unsigned LBracketLoc; 1889 /// The location of the ellipsis separating the start and end 1890 /// indices. Only valid for GNU array-range designators. 1891 unsigned EllipsisLoc; 1892 /// The location of the ']' terminating the array range designator. 1893 unsigned RBracketLoc; 1894 }; 1895 1896 /// @brief Represents a single C99 designator. 1897 /// 1898 /// @todo This class is infuriatingly similar to clang::Designator, 1899 /// but minor differences (storing indices vs. storing pointers) 1900 /// keep us from reusing it. Try harder, later, to rectify these 1901 /// differences. 1902 class Designator { 1903 /// @brief The kind of designator this describes. 1904 enum { 1905 FieldDesignator, 1906 ArrayDesignator, 1907 ArrayRangeDesignator 1908 } Kind; 1909 1910 union { 1911 /// A field designator, e.g., ".x". 1912 struct FieldDesignator Field; 1913 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1914 struct ArrayOrRangeDesignator ArrayOrRange; 1915 }; 1916 friend class DesignatedInitExpr; 1917 1918 public: 1919 /// @brief Initializes a field designator. 1920 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1921 SourceLocation FieldLoc) 1922 : Kind(FieldDesignator) { 1923 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1924 Field.DotLoc = DotLoc.getRawEncoding(); 1925 Field.FieldLoc = FieldLoc.getRawEncoding(); 1926 } 1927 1928 /// @brief Initializes an array designator. 1929 Designator(unsigned Index, SourceLocation LBracketLoc, 1930 SourceLocation RBracketLoc) 1931 : Kind(ArrayDesignator) { 1932 ArrayOrRange.Index = Index; 1933 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1934 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1935 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1936 } 1937 1938 /// @brief Initializes a GNU array-range designator. 1939 Designator(unsigned Index, SourceLocation LBracketLoc, 1940 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1941 : Kind(ArrayRangeDesignator) { 1942 ArrayOrRange.Index = Index; 1943 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1944 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1945 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1946 } 1947 1948 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1949 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1950 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1951 1952 IdentifierInfo * getFieldName(); 1953 1954 FieldDecl *getField() { 1955 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1956 if (Field.NameOrField & 0x01) 1957 return 0; 1958 else 1959 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1960 } 1961 1962 void setField(FieldDecl *FD) { 1963 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1964 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1965 } 1966 1967 SourceLocation getDotLoc() const { 1968 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1969 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1970 } 1971 1972 SourceLocation getFieldLoc() const { 1973 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1974 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1975 } 1976 1977 SourceLocation getLBracketLoc() const { 1978 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1979 "Only valid on an array or array-range designator"); 1980 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1981 } 1982 1983 SourceLocation getRBracketLoc() const { 1984 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1985 "Only valid on an array or array-range designator"); 1986 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1987 } 1988 1989 SourceLocation getEllipsisLoc() const { 1990 assert(Kind == ArrayRangeDesignator && 1991 "Only valid on an array-range designator"); 1992 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 1993 } 1994 1995 SourceLocation getStartLocation() const { 1996 if (Kind == FieldDesignator) 1997 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 1998 else 1999 return getLBracketLoc(); 2000 } 2001 }; 2002 2003 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2004 unsigned NumDesignators, 2005 Expr **IndexExprs, unsigned NumIndexExprs, 2006 SourceLocation EqualOrColonLoc, 2007 bool UsesColonSyntax, Expr *Init); 2008 2009 /// @brief Returns the number of designators in this initializer. 2010 unsigned size() const { return NumDesignators; } 2011 2012 // Iterator access to the designators. 2013 typedef Designator* designators_iterator; 2014 designators_iterator designators_begin(); 2015 designators_iterator designators_end(); 2016 2017 Expr *getArrayIndex(const Designator& D); 2018 Expr *getArrayRangeStart(const Designator& D); 2019 Expr *getArrayRangeEnd(const Designator& D); 2020 2021 /// @brief Retrieve the location of the '=' that precedes the 2022 /// initializer value itself, if present. 2023 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2024 2025 /// @brief Determines whether this designated initializer used the 2026 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 2027 bool usesColonSyntax() const { return UsesColonSyntax; } 2028 2029 /// @brief Retrieve the initializer value. 2030 Expr *getInit() const { 2031 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2032 } 2033 2034 void setInit(Expr *init) { 2035 *child_begin() = init; 2036 } 2037 2038 virtual SourceRange getSourceRange() const; 2039 2040 static bool classof(const Stmt *T) { 2041 return T->getStmtClass() == DesignatedInitExprClass; 2042 } 2043 static bool classof(const DesignatedInitExpr *) { return true; } 2044 2045 // Iterators 2046 virtual child_iterator child_begin(); 2047 virtual child_iterator child_end(); 2048}; 2049 2050/// \brief Represents an implicitly-generated value initialization of 2051/// an object of a given type. 2052/// 2053/// Implicit value initializations occur within semantic initializer 2054/// list expressions (InitListExpr) as placeholders for subobject 2055/// initializations not explicitly specified by the user. 2056/// 2057/// \see InitListExpr 2058class ImplicitValueInitExpr : public Expr { 2059public: 2060 explicit ImplicitValueInitExpr(QualType ty) 2061 : Expr(ImplicitValueInitExprClass, ty) { } 2062 2063 static bool classof(const Stmt *T) { 2064 return T->getStmtClass() == ImplicitValueInitExprClass; 2065 } 2066 static bool classof(const ImplicitValueInitExpr *) { return true; } 2067 2068 virtual SourceRange getSourceRange() const { 2069 return SourceRange(); 2070 } 2071 2072 // Iterators 2073 virtual child_iterator child_begin(); 2074 virtual child_iterator child_end(); 2075}; 2076 2077//===----------------------------------------------------------------------===// 2078// Clang Extensions 2079//===----------------------------------------------------------------------===// 2080 2081 2082/// ExtVectorElementExpr - This represents access to specific elements of a 2083/// vector, and may occur on the left hand side or right hand side. For example 2084/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2085/// 2086/// Note that the base may have either vector or pointer to vector type, just 2087/// like a struct field reference. 2088/// 2089class ExtVectorElementExpr : public Expr { 2090 Stmt *Base; 2091 IdentifierInfo &Accessor; 2092 SourceLocation AccessorLoc; 2093public: 2094 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2095 SourceLocation loc) 2096 : Expr(ExtVectorElementExprClass, ty), 2097 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2098 2099 const Expr *getBase() const { return cast<Expr>(Base); } 2100 Expr *getBase() { return cast<Expr>(Base); } 2101 2102 IdentifierInfo &getAccessor() const { return Accessor; } 2103 2104 /// getNumElements - Get the number of components being selected. 2105 unsigned getNumElements() const; 2106 2107 /// containsDuplicateElements - Return true if any element access is 2108 /// repeated. 2109 bool containsDuplicateElements() const; 2110 2111 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2112 /// aggregate Constant of ConstantInt(s). 2113 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2114 2115 virtual SourceRange getSourceRange() const { 2116 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2117 } 2118 2119 /// isArrow - Return true if the base expression is a pointer to vector, 2120 /// return false if the base expression is a vector. 2121 bool isArrow() const; 2122 2123 static bool classof(const Stmt *T) { 2124 return T->getStmtClass() == ExtVectorElementExprClass; 2125 } 2126 static bool classof(const ExtVectorElementExpr *) { return true; } 2127 2128 // Iterators 2129 virtual child_iterator child_begin(); 2130 virtual child_iterator child_end(); 2131 2132 virtual void EmitImpl(llvm::Serializer& S) const; 2133 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2134}; 2135 2136 2137/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2138/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2139class BlockExpr : public Expr { 2140protected: 2141 BlockDecl *TheBlock; 2142public: 2143 BlockExpr(BlockDecl *BD, QualType ty) : Expr(BlockExprClass, ty), 2144 TheBlock(BD) {} 2145 2146 const BlockDecl *getBlockDecl() const { return TheBlock; } 2147 BlockDecl *getBlockDecl() { return TheBlock; } 2148 2149 // Convenience functions for probing the underlying BlockDecl. 2150 SourceLocation getCaretLocation() const; 2151 const Stmt *getBody() const; 2152 Stmt *getBody(); 2153 2154 virtual SourceRange getSourceRange() const { 2155 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2156 } 2157 2158 /// getFunctionType - Return the underlying function type for this block. 2159 const FunctionType *getFunctionType() const; 2160 2161 static bool classof(const Stmt *T) { 2162 return T->getStmtClass() == BlockExprClass; 2163 } 2164 static bool classof(const BlockExpr *) { return true; } 2165 2166 // Iterators 2167 virtual child_iterator child_begin(); 2168 virtual child_iterator child_end(); 2169 2170 virtual void EmitImpl(llvm::Serializer& S) const; 2171 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2172}; 2173 2174/// BlockDeclRefExpr - A reference to a declared variable, function, 2175/// enum, etc. 2176class BlockDeclRefExpr : public Expr { 2177 ValueDecl *D; 2178 SourceLocation Loc; 2179 bool IsByRef; 2180public: 2181 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2182 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2183 2184 ValueDecl *getDecl() { return D; } 2185 const ValueDecl *getDecl() const { return D; } 2186 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2187 2188 bool isByRef() const { return IsByRef; } 2189 2190 static bool classof(const Stmt *T) { 2191 return T->getStmtClass() == BlockDeclRefExprClass; 2192 } 2193 static bool classof(const BlockDeclRefExpr *) { return true; } 2194 2195 // Iterators 2196 virtual child_iterator child_begin(); 2197 virtual child_iterator child_end(); 2198 2199 virtual void EmitImpl(llvm::Serializer& S) const; 2200 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2201}; 2202 2203} // end namespace clang 2204 2205#endif 2206