Expr.h revision fb7413f12636cefa9ebec9abf95804f82c305b11
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 /// hasLocalSideEffect - Return true if this immediate expression has side 114 /// effects, not counting any sub-expressions. 115 bool hasLocalSideEffect() const; 116 117 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 118 /// incomplete type other than void. Nonarray expressions that can be lvalues: 119 /// - name, where name must be a variable 120 /// - e[i] 121 /// - (e), where e must be an lvalue 122 /// - e.name, where e must be an lvalue 123 /// - e->name 124 /// - *e, the type of e cannot be a function type 125 /// - string-constant 126 /// - reference type [C++ [expr]] 127 /// 128 enum isLvalueResult { 129 LV_Valid, 130 LV_NotObjectType, 131 LV_IncompleteVoidType, 132 LV_DuplicateVectorComponents, 133 LV_InvalidExpression, 134 LV_MemberFunction 135 }; 136 isLvalueResult isLvalue(ASTContext &Ctx) const; 137 138 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 139 /// does not have an incomplete type, does not have a const-qualified type, 140 /// and if it is a structure or union, does not have any member (including, 141 /// recursively, any member or element of all contained aggregates or unions) 142 /// with a const-qualified type. 143 enum isModifiableLvalueResult { 144 MLV_Valid, 145 MLV_NotObjectType, 146 MLV_IncompleteVoidType, 147 MLV_DuplicateVectorComponents, 148 MLV_InvalidExpression, 149 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 150 MLV_IncompleteType, 151 MLV_ConstQualified, 152 MLV_ArrayType, 153 MLV_NotBlockQualified, 154 MLV_ReadonlyProperty, 155 MLV_NoSetterProperty, 156 MLV_MemberFunction 157 }; 158 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx) const; 159 160 bool isBitField(); 161 162 /// getIntegerConstantExprValue() - Return the value of an integer 163 /// constant expression. The expression must be a valid integer 164 /// constant expression as determined by isIntegerConstantExpr. 165 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 166 llvm::APSInt X; 167 bool success = isIntegerConstantExpr(X, Ctx); 168 success = success; 169 assert(success && "Illegal argument to getIntegerConstantExpr"); 170 return X; 171 } 172 173 /// isIntegerConstantExpr - Return true if this expression is a valid integer 174 /// constant expression, and, if so, return its value in Result. If not a 175 /// valid i-c-e, return false and fill in Loc (if specified) with the location 176 /// of the invalid expression. 177 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 178 SourceLocation *Loc = 0, 179 bool isEvaluated = true) const; 180 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 181 llvm::APSInt X; 182 return isIntegerConstantExpr(X, Ctx, Loc); 183 } 184 /// isConstantInitializer - Returns true if this expression is a constant 185 /// initializer, which can be emitted at compile-time. 186 bool isConstantInitializer(ASTContext &Ctx) const; 187 188 /// EvalResult is a struct with detailed info about an evaluated expression. 189 struct EvalResult { 190 /// Val - This is the scalar value the expression can be folded to. 191 APValue Val; 192 193 /// HasSideEffects - Whether the evaluated expression has side effects. 194 /// For example, (f() && 0) can be folded, but it still has side effects. 195 bool HasSideEffects; 196 197 /// Diag - If the expression is unfoldable, then Diag contains a note 198 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 199 /// position for the error, and DiagExpr is the expression that caused 200 /// the error. 201 /// If the expression is foldable, but not an integer constant expression, 202 /// Diag contains a note diagnostic that describes why it isn't an integer 203 /// constant expression. If the expression *is* an integer constant 204 /// expression, then Diag will be zero. 205 unsigned Diag; 206 const Expr *DiagExpr; 207 SourceLocation DiagLoc; 208 209 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 210 }; 211 212 /// Evaluate - Return true if this is a constant which we can fold using 213 /// any crazy technique (that has nothing to do with language standards) that 214 /// we want to. If this function returns true, it returns the folded constant 215 /// in Result. 216 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 217 218 /// isEvaluatable - Call Evaluate to see if this expression can be constant 219 /// folded, but discard the result. 220 bool isEvaluatable(ASTContext &Ctx) const; 221 222 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 223 /// must be called on an expression that constant folds to an integer. 224 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 225 226 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 227 /// integer constant expression with the value zero, or if this is one that is 228 /// cast to void*. 229 bool isNullPointerConstant(ASTContext &Ctx) const; 230 231 /// hasGlobalStorage - Return true if this expression has static storage 232 /// duration. This means that the address of this expression is a link-time 233 /// constant. 234 bool hasGlobalStorage() const; 235 236 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 237 /// its subexpression. If that subexpression is also a ParenExpr, 238 /// then this method recursively returns its subexpression, and so forth. 239 /// Otherwise, the method returns the current Expr. 240 Expr* IgnoreParens(); 241 242 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 243 /// or CastExprs, returning their operand. 244 Expr *IgnoreParenCasts(); 245 246 const Expr* IgnoreParens() const { 247 return const_cast<Expr*>(this)->IgnoreParens(); 248 } 249 const Expr *IgnoreParenCasts() const { 250 return const_cast<Expr*>(this)->IgnoreParenCasts(); 251 } 252 253 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 254 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 255 256 static bool classof(const Stmt *T) { 257 return T->getStmtClass() >= firstExprConstant && 258 T->getStmtClass() <= lastExprConstant; 259 } 260 static bool classof(const Expr *) { return true; } 261 262 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 263 return cast<Expr>(Stmt::Create(D, C)); 264 } 265}; 266 267 268//===----------------------------------------------------------------------===// 269// Primary Expressions. 270//===----------------------------------------------------------------------===// 271 272/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 273/// enum, etc. 274class DeclRefExpr : public Expr { 275 NamedDecl *D; 276 SourceLocation Loc; 277 278protected: 279 // FIXME: Eventually, this constructor will go away and all subclasses 280 // will have to provide the type- and value-dependent flags. 281 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 282 Expr(SC, t), D(d), Loc(l) {} 283 284 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 285 bool VD) : 286 Expr(SC, t, TD, VD), D(d), Loc(l) {} 287 288public: 289 // FIXME: Eventually, this constructor will go away and all clients 290 // will have to provide the type- and value-dependent flags. 291 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 292 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 293 294 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 295 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 296 297 NamedDecl *getDecl() { return D; } 298 const NamedDecl *getDecl() const { return D; } 299 void setDecl(NamedDecl *NewD) { D = NewD; } 300 301 SourceLocation getLocation() const { return Loc; } 302 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 303 304 static bool classof(const Stmt *T) { 305 return T->getStmtClass() == DeclRefExprClass || 306 T->getStmtClass() == CXXConditionDeclExprClass || 307 T->getStmtClass() == QualifiedDeclRefExprClass; 308 } 309 static bool classof(const DeclRefExpr *) { return true; } 310 311 // Iterators 312 virtual child_iterator child_begin(); 313 virtual child_iterator child_end(); 314 315 virtual void EmitImpl(llvm::Serializer& S) const; 316 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 317}; 318 319/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 320class PredefinedExpr : public Expr { 321public: 322 enum IdentType { 323 Func, 324 Function, 325 PrettyFunction 326 }; 327 328private: 329 SourceLocation Loc; 330 IdentType Type; 331public: 332 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 333 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 334 335 IdentType getIdentType() const { return Type; } 336 337 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 338 339 static bool classof(const Stmt *T) { 340 return T->getStmtClass() == PredefinedExprClass; 341 } 342 static bool classof(const PredefinedExpr *) { return true; } 343 344 // Iterators 345 virtual child_iterator child_begin(); 346 virtual child_iterator child_end(); 347 348 virtual void EmitImpl(llvm::Serializer& S) const; 349 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 350}; 351 352class IntegerLiteral : public Expr { 353 llvm::APInt Value; 354 SourceLocation Loc; 355public: 356 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 357 // or UnsignedLongLongTy 358 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 359 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 360 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 361 } 362 const llvm::APInt &getValue() const { return Value; } 363 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 364 365 static bool classof(const Stmt *T) { 366 return T->getStmtClass() == IntegerLiteralClass; 367 } 368 static bool classof(const IntegerLiteral *) { return true; } 369 370 // Iterators 371 virtual child_iterator child_begin(); 372 virtual child_iterator child_end(); 373 374 virtual void EmitImpl(llvm::Serializer& S) const; 375 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 376}; 377 378class CharacterLiteral : public Expr { 379 unsigned Value; 380 SourceLocation Loc; 381 bool IsWide; 382public: 383 // type should be IntTy 384 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 385 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 386 } 387 SourceLocation getLoc() const { return Loc; } 388 bool isWide() const { return IsWide; } 389 390 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 391 392 unsigned getValue() const { return Value; } 393 394 static bool classof(const Stmt *T) { 395 return T->getStmtClass() == CharacterLiteralClass; 396 } 397 static bool classof(const CharacterLiteral *) { return true; } 398 399 // Iterators 400 virtual child_iterator child_begin(); 401 virtual child_iterator child_end(); 402 403 virtual void EmitImpl(llvm::Serializer& S) const; 404 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 405}; 406 407class FloatingLiteral : public Expr { 408 llvm::APFloat Value; 409 bool IsExact : 1; 410 SourceLocation Loc; 411public: 412 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 413 QualType Type, SourceLocation L) 414 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 415 416 const llvm::APFloat &getValue() const { return Value; } 417 418 bool isExact() const { return IsExact; } 419 420 /// getValueAsApproximateDouble - This returns the value as an inaccurate 421 /// double. Note that this may cause loss of precision, but is useful for 422 /// debugging dumps, etc. 423 double getValueAsApproximateDouble() const; 424 425 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 426 427 static bool classof(const Stmt *T) { 428 return T->getStmtClass() == FloatingLiteralClass; 429 } 430 static bool classof(const FloatingLiteral *) { return true; } 431 432 // Iterators 433 virtual child_iterator child_begin(); 434 virtual child_iterator child_end(); 435 436 virtual void EmitImpl(llvm::Serializer& S) const; 437 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 438}; 439 440/// ImaginaryLiteral - We support imaginary integer and floating point literals, 441/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 442/// IntegerLiteral classes. Instances of this class always have a Complex type 443/// whose element type matches the subexpression. 444/// 445class ImaginaryLiteral : public Expr { 446 Stmt *Val; 447public: 448 ImaginaryLiteral(Expr *val, QualType Ty) 449 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 450 451 const Expr *getSubExpr() const { return cast<Expr>(Val); } 452 Expr *getSubExpr() { return cast<Expr>(Val); } 453 454 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 455 static bool classof(const Stmt *T) { 456 return T->getStmtClass() == ImaginaryLiteralClass; 457 } 458 static bool classof(const ImaginaryLiteral *) { return true; } 459 460 // Iterators 461 virtual child_iterator child_begin(); 462 virtual child_iterator child_end(); 463 464 virtual void EmitImpl(llvm::Serializer& S) const; 465 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 466}; 467 468/// StringLiteral - This represents a string literal expression, e.g. "foo" 469/// or L"bar" (wide strings). The actual string is returned by getStrData() 470/// is NOT null-terminated, and the length of the string is determined by 471/// calling getByteLength(). The C type for a string is always a 472/// ConstantArrayType. 473class StringLiteral : public Expr { 474 const char *StrData; 475 unsigned ByteLength; 476 bool IsWide; 477 // if the StringLiteral was composed using token pasting, both locations 478 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 479 // FIXME: if space becomes an issue, we should create a sub-class. 480 SourceLocation firstTokLoc, lastTokLoc; 481public: 482 StringLiteral(ASTContext& C, const char *strData, unsigned byteLength, 483 bool Wide, QualType t, SourceLocation b, SourceLocation e); 484 485 void Destroy(ASTContext& C); 486 487 const char *getStrData() const { return StrData; } 488 unsigned getByteLength() const { return ByteLength; } 489 bool isWide() const { return IsWide; } 490 491 virtual SourceRange getSourceRange() const { 492 return SourceRange(firstTokLoc,lastTokLoc); 493 } 494 static bool classof(const Stmt *T) { 495 return T->getStmtClass() == StringLiteralClass; 496 } 497 static bool classof(const StringLiteral *) { return true; } 498 499 // Iterators 500 virtual child_iterator child_begin(); 501 virtual child_iterator child_end(); 502 503 virtual void EmitImpl(llvm::Serializer& S) const; 504 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 505}; 506 507/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 508/// AST node is only formed if full location information is requested. 509class ParenExpr : public Expr { 510 SourceLocation L, R; 511 Stmt *Val; 512public: 513 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 514 : Expr(ParenExprClass, val->getType(), 515 val->isTypeDependent(), val->isValueDependent()), 516 L(l), R(r), Val(val) {} 517 518 const Expr *getSubExpr() const { return cast<Expr>(Val); } 519 Expr *getSubExpr() { return cast<Expr>(Val); } 520 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 521 522 static bool classof(const Stmt *T) { 523 return T->getStmtClass() == ParenExprClass; 524 } 525 static bool classof(const ParenExpr *) { return true; } 526 527 // Iterators 528 virtual child_iterator child_begin(); 529 virtual child_iterator child_end(); 530 531 virtual void EmitImpl(llvm::Serializer& S) const; 532 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 533}; 534 535 536/// UnaryOperator - This represents the unary-expression's (except sizeof and 537/// alignof), the postinc/postdec operators from postfix-expression, and various 538/// extensions. 539/// 540/// Notes on various nodes: 541/// 542/// Real/Imag - These return the real/imag part of a complex operand. If 543/// applied to a non-complex value, the former returns its operand and the 544/// later returns zero in the type of the operand. 545/// 546/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 547/// subexpression is a compound literal with the various MemberExpr and 548/// ArraySubscriptExpr's applied to it. 549/// 550class UnaryOperator : public Expr { 551public: 552 // Note that additions to this should also update the StmtVisitor class. 553 enum Opcode { 554 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 555 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 556 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 557 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 558 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 559 Real, Imag, // "__real expr"/"__imag expr" Extension. 560 Extension, // __extension__ marker. 561 OffsetOf // __builtin_offsetof 562 }; 563private: 564 Stmt *Val; 565 Opcode Opc; 566 SourceLocation Loc; 567public: 568 569 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 570 : Expr(UnaryOperatorClass, type, 571 input->isTypeDependent() && opc != OffsetOf, 572 input->isValueDependent()), 573 Val(input), Opc(opc), Loc(l) {} 574 575 Opcode getOpcode() const { return Opc; } 576 Expr *getSubExpr() const { return cast<Expr>(Val); } 577 578 /// getOperatorLoc - Return the location of the operator. 579 SourceLocation getOperatorLoc() const { return Loc; } 580 581 /// isPostfix - Return true if this is a postfix operation, like x++. 582 static bool isPostfix(Opcode Op); 583 584 /// isPostfix - Return true if this is a prefix operation, like --x. 585 static bool isPrefix(Opcode Op); 586 587 bool isPrefix() const { return isPrefix(Opc); } 588 bool isPostfix() const { return isPostfix(Opc); } 589 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 590 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 591 bool isOffsetOfOp() const { return Opc == OffsetOf; } 592 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 593 594 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 595 /// corresponds to, e.g. "sizeof" or "[pre]++" 596 static const char *getOpcodeStr(Opcode Op); 597 598 virtual SourceRange getSourceRange() const { 599 if (isPostfix()) 600 return SourceRange(Val->getLocStart(), Loc); 601 else 602 return SourceRange(Loc, Val->getLocEnd()); 603 } 604 virtual SourceLocation getExprLoc() const { return Loc; } 605 606 static bool classof(const Stmt *T) { 607 return T->getStmtClass() == UnaryOperatorClass; 608 } 609 static bool classof(const UnaryOperator *) { return true; } 610 611 int64_t evaluateOffsetOf(ASTContext& C) const; 612 613 // Iterators 614 virtual child_iterator child_begin(); 615 virtual child_iterator child_end(); 616 617 virtual void EmitImpl(llvm::Serializer& S) const; 618 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 619}; 620 621/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 622/// types and expressions. 623class SizeOfAlignOfExpr : public Expr { 624 bool isSizeof : 1; // true if sizeof, false if alignof. 625 bool isType : 1; // true if operand is a type, false if an expression 626 union { 627 void *Ty; 628 Stmt *Ex; 629 } Argument; 630 SourceLocation OpLoc, RParenLoc; 631public: 632 SizeOfAlignOfExpr(bool issizeof, bool istype, void *argument, 633 QualType resultType, SourceLocation op, 634 SourceLocation rp) : 635 Expr(SizeOfAlignOfExprClass, resultType), isSizeof(issizeof), 636 isType(istype), OpLoc(op), RParenLoc(rp) { 637 if (isType) 638 Argument.Ty = argument; 639 else 640 // argument was an Expr*, so cast it back to that to be safe 641 Argument.Ex = static_cast<Expr*>(argument); 642 } 643 644 virtual void Destroy(ASTContext& C); 645 646 bool isSizeOf() const { return isSizeof; } 647 bool isArgumentType() const { return isType; } 648 QualType getArgumentType() const { 649 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 650 return QualType::getFromOpaquePtr(Argument.Ty); 651 } 652 Expr *getArgumentExpr() { 653 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 654 return static_cast<Expr*>(Argument.Ex); 655 } 656 const Expr *getArgumentExpr() const { 657 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 658 } 659 660 /// Gets the argument type, or the type of the argument expression, whichever 661 /// is appropriate. 662 QualType getTypeOfArgument() const { 663 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 664 } 665 666 SourceLocation getOperatorLoc() const { return OpLoc; } 667 668 virtual SourceRange getSourceRange() const { 669 return SourceRange(OpLoc, RParenLoc); 670 } 671 672 static bool classof(const Stmt *T) { 673 return T->getStmtClass() == SizeOfAlignOfExprClass; 674 } 675 static bool classof(const SizeOfAlignOfExpr *) { return true; } 676 677 // Iterators 678 virtual child_iterator child_begin(); 679 virtual child_iterator child_end(); 680 681 virtual void EmitImpl(llvm::Serializer& S) const; 682 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 683}; 684 685//===----------------------------------------------------------------------===// 686// Postfix Operators. 687//===----------------------------------------------------------------------===// 688 689/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 690class ArraySubscriptExpr : public Expr { 691 enum { LHS, RHS, END_EXPR=2 }; 692 Stmt* SubExprs[END_EXPR]; 693 SourceLocation RBracketLoc; 694public: 695 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 696 SourceLocation rbracketloc) 697 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 698 SubExprs[LHS] = lhs; 699 SubExprs[RHS] = rhs; 700 } 701 702 /// An array access can be written A[4] or 4[A] (both are equivalent). 703 /// - getBase() and getIdx() always present the normalized view: A[4]. 704 /// In this case getBase() returns "A" and getIdx() returns "4". 705 /// - getLHS() and getRHS() present the syntactic view. e.g. for 706 /// 4[A] getLHS() returns "4". 707 /// Note: Because vector element access is also written A[4] we must 708 /// predicate the format conversion in getBase and getIdx only on the 709 /// the type of the RHS, as it is possible for the LHS to be a vector of 710 /// integer type 711 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 712 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 713 714 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 715 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 716 717 Expr *getBase() { 718 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 719 } 720 721 const Expr *getBase() const { 722 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 723 } 724 725 Expr *getIdx() { 726 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 727 } 728 729 const Expr *getIdx() const { 730 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 731 } 732 733 virtual SourceRange getSourceRange() const { 734 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 735 } 736 737 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 738 739 static bool classof(const Stmt *T) { 740 return T->getStmtClass() == ArraySubscriptExprClass; 741 } 742 static bool classof(const ArraySubscriptExpr *) { return true; } 743 744 // Iterators 745 virtual child_iterator child_begin(); 746 virtual child_iterator child_end(); 747 748 virtual void EmitImpl(llvm::Serializer& S) const; 749 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 750}; 751 752 753/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 754/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 755/// while its subclasses may represent alternative syntax that (semantically) 756/// results in a function call. For example, CXXOperatorCallExpr is 757/// a subclass for overloaded operator calls that use operator syntax, e.g., 758/// "str1 + str2" to resolve to a function call. 759class CallExpr : public Expr { 760 enum { FN=0, ARGS_START=1 }; 761 Stmt **SubExprs; 762 unsigned NumArgs; 763 SourceLocation RParenLoc; 764 765 // This version of the ctor is for deserialization. 766 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 767 SourceLocation rparenloc) 768 : Expr(SC,t), SubExprs(subexprs), 769 NumArgs(numargs), RParenLoc(rparenloc) {} 770 771protected: 772 // This version of the constructor is for derived classes. 773 CallExpr(StmtClass SC, Expr *fn, Expr **args, unsigned numargs, QualType t, 774 SourceLocation rparenloc); 775 776public: 777 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 778 SourceLocation rparenloc); 779 ~CallExpr() { delete [] SubExprs; } 780 781 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 782 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 783 void setCallee(Expr *F) { SubExprs[FN] = F; } 784 785 /// getNumArgs - Return the number of actual arguments to this call. 786 /// 787 unsigned getNumArgs() const { return NumArgs; } 788 789 /// getArg - Return the specified argument. 790 Expr *getArg(unsigned Arg) { 791 assert(Arg < NumArgs && "Arg access out of range!"); 792 return cast<Expr>(SubExprs[Arg+ARGS_START]); 793 } 794 const Expr *getArg(unsigned Arg) const { 795 assert(Arg < NumArgs && "Arg access out of range!"); 796 return cast<Expr>(SubExprs[Arg+ARGS_START]); 797 } 798 /// setArg - Set the specified argument. 799 void setArg(unsigned Arg, Expr *ArgExpr) { 800 assert(Arg < NumArgs && "Arg access out of range!"); 801 SubExprs[Arg+ARGS_START] = ArgExpr; 802 } 803 804 /// setNumArgs - This changes the number of arguments present in this call. 805 /// Any orphaned expressions are deleted by this, and any new operands are set 806 /// to null. 807 void setNumArgs(ASTContext& C, unsigned NumArgs); 808 809 typedef ExprIterator arg_iterator; 810 typedef ConstExprIterator const_arg_iterator; 811 812 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 813 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 814 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 815 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 816 817 /// getNumCommas - Return the number of commas that must have been present in 818 /// this function call. 819 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 820 821 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 822 /// not, return 0. 823 unsigned isBuiltinCall() const; 824 825 SourceLocation getRParenLoc() const { return RParenLoc; } 826 827 virtual SourceRange getSourceRange() const { 828 return SourceRange(getCallee()->getLocStart(), RParenLoc); 829 } 830 831 static bool classof(const Stmt *T) { 832 return T->getStmtClass() == CallExprClass || 833 T->getStmtClass() == CXXOperatorCallExprClass || 834 T->getStmtClass() == CXXMemberCallExprClass; 835 } 836 static bool classof(const CallExpr *) { return true; } 837 static bool classof(const CXXOperatorCallExpr *) { return true; } 838 static bool classof(const CXXMemberCallExpr *) { return true; } 839 840 // Iterators 841 virtual child_iterator child_begin(); 842 virtual child_iterator child_end(); 843 844 virtual void EmitImpl(llvm::Serializer& S) const; 845 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 846 StmtClass SC); 847}; 848 849/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 850/// 851class MemberExpr : public Expr { 852 Stmt *Base; 853 NamedDecl *MemberDecl; 854 SourceLocation MemberLoc; 855 bool IsArrow; // True if this is "X->F", false if this is "X.F". 856public: 857 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 858 QualType ty) 859 : Expr(MemberExprClass, ty), 860 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 861 862 void setBase(Expr *E) { Base = E; } 863 Expr *getBase() const { return cast<Expr>(Base); } 864 NamedDecl *getMemberDecl() const { return MemberDecl; } 865 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 866 bool isArrow() const { return IsArrow; } 867 868 virtual SourceRange getSourceRange() const { 869 return SourceRange(getBase()->getLocStart(), MemberLoc); 870 } 871 872 virtual SourceLocation getExprLoc() const { return MemberLoc; } 873 874 static bool classof(const Stmt *T) { 875 return T->getStmtClass() == MemberExprClass; 876 } 877 static bool classof(const MemberExpr *) { return true; } 878 879 // Iterators 880 virtual child_iterator child_begin(); 881 virtual child_iterator child_end(); 882 883 virtual void EmitImpl(llvm::Serializer& S) const; 884 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 885}; 886 887/// CompoundLiteralExpr - [C99 6.5.2.5] 888/// 889class CompoundLiteralExpr : public Expr { 890 /// LParenLoc - If non-null, this is the location of the left paren in a 891 /// compound literal like "(int){4}". This can be null if this is a 892 /// synthesized compound expression. 893 SourceLocation LParenLoc; 894 Stmt *Init; 895 bool FileScope; 896public: 897 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 898 bool fileScope) 899 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 900 FileScope(fileScope) {} 901 902 const Expr *getInitializer() const { return cast<Expr>(Init); } 903 Expr *getInitializer() { return cast<Expr>(Init); } 904 905 bool isFileScope() const { return FileScope; } 906 907 SourceLocation getLParenLoc() const { return LParenLoc; } 908 909 virtual SourceRange getSourceRange() const { 910 // FIXME: Init should never be null. 911 if (!Init) 912 return SourceRange(); 913 if (LParenLoc.isInvalid()) 914 return Init->getSourceRange(); 915 return SourceRange(LParenLoc, Init->getLocEnd()); 916 } 917 918 static bool classof(const Stmt *T) { 919 return T->getStmtClass() == CompoundLiteralExprClass; 920 } 921 static bool classof(const CompoundLiteralExpr *) { return true; } 922 923 // Iterators 924 virtual child_iterator child_begin(); 925 virtual child_iterator child_end(); 926 927 virtual void EmitImpl(llvm::Serializer& S) const; 928 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 929}; 930 931/// CastExpr - Base class for type casts, including both implicit 932/// casts (ImplicitCastExpr) and explicit casts that have some 933/// representation in the source code (ExplicitCastExpr's derived 934/// classes). 935class CastExpr : public Expr { 936 Stmt *Op; 937protected: 938 CastExpr(StmtClass SC, QualType ty, Expr *op) : 939 Expr(SC, ty, 940 // Cast expressions are type-dependent if the type is 941 // dependent (C++ [temp.dep.expr]p3). 942 ty->isDependentType(), 943 // Cast expressions are value-dependent if the type is 944 // dependent or if the subexpression is value-dependent. 945 ty->isDependentType() || (op && op->isValueDependent())), 946 Op(op) {} 947 948public: 949 Expr *getSubExpr() { return cast<Expr>(Op); } 950 const Expr *getSubExpr() const { return cast<Expr>(Op); } 951 952 static bool classof(const Stmt *T) { 953 StmtClass SC = T->getStmtClass(); 954 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 955 return true; 956 957 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 958 return true; 959 960 return false; 961 } 962 static bool classof(const CastExpr *) { return true; } 963 964 // Iterators 965 virtual child_iterator child_begin(); 966 virtual child_iterator child_end(); 967}; 968 969/// ImplicitCastExpr - Allows us to explicitly represent implicit type 970/// conversions, which have no direct representation in the original 971/// source code. For example: converting T[]->T*, void f()->void 972/// (*f)(), float->double, short->int, etc. 973/// 974/// In C, implicit casts always produce rvalues. However, in C++, an 975/// implicit cast whose result is being bound to a reference will be 976/// an lvalue. For example: 977/// 978/// @code 979/// class Base { }; 980/// class Derived : public Base { }; 981/// void f(Derived d) { 982/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 983/// } 984/// @endcode 985class ImplicitCastExpr : public CastExpr { 986 /// LvalueCast - Whether this cast produces an lvalue. 987 bool LvalueCast; 988 989public: 990 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 991 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 992 993 virtual SourceRange getSourceRange() const { 994 return getSubExpr()->getSourceRange(); 995 } 996 997 /// isLvalueCast - Whether this cast produces an lvalue. 998 bool isLvalueCast() const { return LvalueCast; } 999 1000 /// setLvalueCast - Set whether this cast produces an lvalue. 1001 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1002 1003 static bool classof(const Stmt *T) { 1004 return T->getStmtClass() == ImplicitCastExprClass; 1005 } 1006 static bool classof(const ImplicitCastExpr *) { return true; } 1007 1008 virtual void EmitImpl(llvm::Serializer& S) const; 1009 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1010}; 1011 1012/// ExplicitCastExpr - An explicit cast written in the source 1013/// code. 1014/// 1015/// This class is effectively an abstract class, because it provides 1016/// the basic representation of an explicitly-written cast without 1017/// specifying which kind of cast (C cast, functional cast, static 1018/// cast, etc.) was written; specific derived classes represent the 1019/// particular style of cast and its location information. 1020/// 1021/// Unlike implicit casts, explicit cast nodes have two different 1022/// types: the type that was written into the source code, and the 1023/// actual type of the expression as determined by semantic 1024/// analysis. These types may differ slightly. For example, in C++ one 1025/// can cast to a reference type, which indicates that the resulting 1026/// expression will be an lvalue. The reference type, however, will 1027/// not be used as the type of the expression. 1028class ExplicitCastExpr : public CastExpr { 1029 /// TypeAsWritten - The type that this expression is casting to, as 1030 /// written in the source code. 1031 QualType TypeAsWritten; 1032 1033protected: 1034 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1035 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1036 1037public: 1038 /// getTypeAsWritten - Returns the type that this expression is 1039 /// casting to, as written in the source code. 1040 QualType getTypeAsWritten() const { return TypeAsWritten; } 1041 1042 static bool classof(const Stmt *T) { 1043 StmtClass SC = T->getStmtClass(); 1044 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1045 return true; 1046 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1047 return true; 1048 1049 return false; 1050 } 1051 static bool classof(const ExplicitCastExpr *) { return true; } 1052}; 1053 1054/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1055/// cast in C++ (C++ [expr.cast]), which uses the syntax 1056/// (Type)expr. For example: @c (int)f. 1057class CStyleCastExpr : public ExplicitCastExpr { 1058 SourceLocation LPLoc; // the location of the left paren 1059 SourceLocation RPLoc; // the location of the right paren 1060public: 1061 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1062 SourceLocation l, SourceLocation r) : 1063 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1064 LPLoc(l), RPLoc(r) {} 1065 1066 SourceLocation getLParenLoc() const { return LPLoc; } 1067 SourceLocation getRParenLoc() const { return RPLoc; } 1068 1069 virtual SourceRange getSourceRange() const { 1070 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1071 } 1072 static bool classof(const Stmt *T) { 1073 return T->getStmtClass() == CStyleCastExprClass; 1074 } 1075 static bool classof(const CStyleCastExpr *) { return true; } 1076 1077 virtual void EmitImpl(llvm::Serializer& S) const; 1078 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1079}; 1080 1081class BinaryOperator : public Expr { 1082public: 1083 enum Opcode { 1084 // Operators listed in order of precedence. 1085 // Note that additions to this should also update the StmtVisitor class. 1086 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1087 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1088 Add, Sub, // [C99 6.5.6] Additive operators. 1089 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1090 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1091 EQ, NE, // [C99 6.5.9] Equality operators. 1092 And, // [C99 6.5.10] Bitwise AND operator. 1093 Xor, // [C99 6.5.11] Bitwise XOR operator. 1094 Or, // [C99 6.5.12] Bitwise OR operator. 1095 LAnd, // [C99 6.5.13] Logical AND operator. 1096 LOr, // [C99 6.5.14] Logical OR operator. 1097 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1098 DivAssign, RemAssign, 1099 AddAssign, SubAssign, 1100 ShlAssign, ShrAssign, 1101 AndAssign, XorAssign, 1102 OrAssign, 1103 Comma // [C99 6.5.17] Comma operator. 1104 }; 1105private: 1106 enum { LHS, RHS, END_EXPR }; 1107 Stmt* SubExprs[END_EXPR]; 1108 Opcode Opc; 1109 SourceLocation OpLoc; 1110public: 1111 1112 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1113 SourceLocation opLoc) 1114 : Expr(BinaryOperatorClass, ResTy, 1115 lhs->isTypeDependent() || rhs->isTypeDependent(), 1116 lhs->isValueDependent() || rhs->isValueDependent()), 1117 Opc(opc), OpLoc(opLoc) { 1118 SubExprs[LHS] = lhs; 1119 SubExprs[RHS] = rhs; 1120 assert(!isCompoundAssignmentOp() && 1121 "Use ArithAssignBinaryOperator for compound assignments"); 1122 } 1123 1124 SourceLocation getOperatorLoc() const { return OpLoc; } 1125 Opcode getOpcode() const { return Opc; } 1126 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1127 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1128 virtual SourceRange getSourceRange() const { 1129 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1130 } 1131 1132 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1133 /// corresponds to, e.g. "<<=". 1134 static const char *getOpcodeStr(Opcode Op); 1135 1136 /// predicates to categorize the respective opcodes. 1137 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1138 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1139 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1140 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1141 1142 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1143 bool isRelationalOp() const { return isRelationalOp(Opc); } 1144 1145 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1146 bool isEqualityOp() const { return isEqualityOp(Opc); } 1147 1148 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1149 bool isLogicalOp() const { return isLogicalOp(Opc); } 1150 1151 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1152 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1153 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1154 1155 static bool classof(const Stmt *S) { 1156 return S->getStmtClass() == BinaryOperatorClass || 1157 S->getStmtClass() == CompoundAssignOperatorClass; 1158 } 1159 static bool classof(const BinaryOperator *) { return true; } 1160 1161 // Iterators 1162 virtual child_iterator child_begin(); 1163 virtual child_iterator child_end(); 1164 1165 virtual void EmitImpl(llvm::Serializer& S) const; 1166 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1167 1168protected: 1169 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1170 SourceLocation oploc, bool dead) 1171 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1172 SubExprs[LHS] = lhs; 1173 SubExprs[RHS] = rhs; 1174 } 1175}; 1176 1177/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1178/// track of the type the operation is performed in. Due to the semantics of 1179/// these operators, the operands are promoted, the aritmetic performed, an 1180/// implicit conversion back to the result type done, then the assignment takes 1181/// place. This captures the intermediate type which the computation is done 1182/// in. 1183class CompoundAssignOperator : public BinaryOperator { 1184 QualType ComputationType; 1185public: 1186 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1187 QualType ResType, QualType CompType, 1188 SourceLocation OpLoc) 1189 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1190 ComputationType(CompType) { 1191 assert(isCompoundAssignmentOp() && 1192 "Only should be used for compound assignments"); 1193 } 1194 1195 QualType getComputationType() const { return ComputationType; } 1196 1197 static bool classof(const CompoundAssignOperator *) { return true; } 1198 static bool classof(const Stmt *S) { 1199 return S->getStmtClass() == CompoundAssignOperatorClass; 1200 } 1201 1202 virtual void EmitImpl(llvm::Serializer& S) const; 1203 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1204 ASTContext& C); 1205}; 1206 1207/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1208/// GNU "missing LHS" extension is in use. 1209/// 1210class ConditionalOperator : public Expr { 1211 enum { COND, LHS, RHS, END_EXPR }; 1212 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1213public: 1214 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1215 : Expr(ConditionalOperatorClass, t, 1216 // FIXME: the type of the conditional operator doesn't 1217 // depend on the type of the conditional, but the standard 1218 // seems to imply that it could. File a bug! 1219 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1220 (cond->isValueDependent() || 1221 (lhs && lhs->isValueDependent()) || 1222 (rhs && rhs->isValueDependent()))) { 1223 SubExprs[COND] = cond; 1224 SubExprs[LHS] = lhs; 1225 SubExprs[RHS] = rhs; 1226 } 1227 1228 // getCond - Return the expression representing the condition for 1229 // the ?: operator. 1230 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1231 1232 // getTrueExpr - Return the subexpression representing the value of the ?: 1233 // expression if the condition evaluates to true. In most cases this value 1234 // will be the same as getLHS() except a GCC extension allows the left 1235 // subexpression to be omitted, and instead of the condition be returned. 1236 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1237 // is only evaluated once. 1238 Expr *getTrueExpr() const { 1239 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1240 } 1241 1242 // getTrueExpr - Return the subexpression representing the value of the ?: 1243 // expression if the condition evaluates to false. This is the same as getRHS. 1244 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1245 1246 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1247 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1248 1249 virtual SourceRange getSourceRange() const { 1250 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1251 } 1252 static bool classof(const Stmt *T) { 1253 return T->getStmtClass() == ConditionalOperatorClass; 1254 } 1255 static bool classof(const ConditionalOperator *) { return true; } 1256 1257 // Iterators 1258 virtual child_iterator child_begin(); 1259 virtual child_iterator child_end(); 1260 1261 virtual void EmitImpl(llvm::Serializer& S) const; 1262 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1263}; 1264 1265/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1266class AddrLabelExpr : public Expr { 1267 SourceLocation AmpAmpLoc, LabelLoc; 1268 LabelStmt *Label; 1269public: 1270 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1271 QualType t) 1272 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1273 1274 virtual SourceRange getSourceRange() const { 1275 return SourceRange(AmpAmpLoc, LabelLoc); 1276 } 1277 1278 LabelStmt *getLabel() const { return Label; } 1279 1280 static bool classof(const Stmt *T) { 1281 return T->getStmtClass() == AddrLabelExprClass; 1282 } 1283 static bool classof(const AddrLabelExpr *) { return true; } 1284 1285 // Iterators 1286 virtual child_iterator child_begin(); 1287 virtual child_iterator child_end(); 1288 1289 virtual void EmitImpl(llvm::Serializer& S) const; 1290 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1291}; 1292 1293/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1294/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1295/// takes the value of the last subexpression. 1296class StmtExpr : public Expr { 1297 Stmt *SubStmt; 1298 SourceLocation LParenLoc, RParenLoc; 1299public: 1300 StmtExpr(CompoundStmt *substmt, QualType T, 1301 SourceLocation lp, SourceLocation rp) : 1302 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1303 1304 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1305 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1306 1307 virtual SourceRange getSourceRange() const { 1308 return SourceRange(LParenLoc, RParenLoc); 1309 } 1310 1311 static bool classof(const Stmt *T) { 1312 return T->getStmtClass() == StmtExprClass; 1313 } 1314 static bool classof(const StmtExpr *) { return true; } 1315 1316 // Iterators 1317 virtual child_iterator child_begin(); 1318 virtual child_iterator child_end(); 1319 1320 virtual void EmitImpl(llvm::Serializer& S) const; 1321 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1322}; 1323 1324/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1325/// This AST node represents a function that returns 1 if two *types* (not 1326/// expressions) are compatible. The result of this built-in function can be 1327/// used in integer constant expressions. 1328class TypesCompatibleExpr : public Expr { 1329 QualType Type1; 1330 QualType Type2; 1331 SourceLocation BuiltinLoc, RParenLoc; 1332public: 1333 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1334 QualType t1, QualType t2, SourceLocation RP) : 1335 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1336 BuiltinLoc(BLoc), RParenLoc(RP) {} 1337 1338 QualType getArgType1() const { return Type1; } 1339 QualType getArgType2() const { return Type2; } 1340 1341 virtual SourceRange getSourceRange() const { 1342 return SourceRange(BuiltinLoc, RParenLoc); 1343 } 1344 static bool classof(const Stmt *T) { 1345 return T->getStmtClass() == TypesCompatibleExprClass; 1346 } 1347 static bool classof(const TypesCompatibleExpr *) { return true; } 1348 1349 // Iterators 1350 virtual child_iterator child_begin(); 1351 virtual child_iterator child_end(); 1352 1353 virtual void EmitImpl(llvm::Serializer& S) const; 1354 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1355}; 1356 1357/// ShuffleVectorExpr - clang-specific builtin-in function 1358/// __builtin_shufflevector. 1359/// This AST node represents a operator that does a constant 1360/// shuffle, similar to LLVM's shufflevector instruction. It takes 1361/// two vectors and a variable number of constant indices, 1362/// and returns the appropriately shuffled vector. 1363class ShuffleVectorExpr : public Expr { 1364 SourceLocation BuiltinLoc, RParenLoc; 1365 1366 // SubExprs - the list of values passed to the __builtin_shufflevector 1367 // function. The first two are vectors, and the rest are constant 1368 // indices. The number of values in this list is always 1369 // 2+the number of indices in the vector type. 1370 Stmt **SubExprs; 1371 unsigned NumExprs; 1372 1373public: 1374 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1375 QualType Type, SourceLocation BLoc, 1376 SourceLocation RP) : 1377 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1378 RParenLoc(RP), NumExprs(nexpr) { 1379 1380 SubExprs = new Stmt*[nexpr]; 1381 for (unsigned i = 0; i < nexpr; i++) 1382 SubExprs[i] = args[i]; 1383 } 1384 1385 virtual SourceRange getSourceRange() const { 1386 return SourceRange(BuiltinLoc, RParenLoc); 1387 } 1388 static bool classof(const Stmt *T) { 1389 return T->getStmtClass() == ShuffleVectorExprClass; 1390 } 1391 static bool classof(const ShuffleVectorExpr *) { return true; } 1392 1393 ~ShuffleVectorExpr() { 1394 delete [] SubExprs; 1395 } 1396 1397 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1398 /// constant expression, the actual arguments passed in, and the function 1399 /// pointers. 1400 unsigned getNumSubExprs() const { return NumExprs; } 1401 1402 /// getExpr - Return the Expr at the specified index. 1403 Expr *getExpr(unsigned Index) { 1404 assert((Index < NumExprs) && "Arg access out of range!"); 1405 return cast<Expr>(SubExprs[Index]); 1406 } 1407 const Expr *getExpr(unsigned Index) const { 1408 assert((Index < NumExprs) && "Arg access out of range!"); 1409 return cast<Expr>(SubExprs[Index]); 1410 } 1411 1412 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1413 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1414 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1415 } 1416 1417 // Iterators 1418 virtual child_iterator child_begin(); 1419 virtual child_iterator child_end(); 1420 1421 virtual void EmitImpl(llvm::Serializer& S) const; 1422 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1423}; 1424 1425/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1426/// This AST node is similar to the conditional operator (?:) in C, with 1427/// the following exceptions: 1428/// - the test expression must be a constant expression. 1429/// - the expression returned has it's type unaltered by promotion rules. 1430/// - does not evaluate the expression that was not chosen. 1431class ChooseExpr : public Expr { 1432 enum { COND, LHS, RHS, END_EXPR }; 1433 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1434 SourceLocation BuiltinLoc, RParenLoc; 1435public: 1436 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1437 SourceLocation RP) 1438 : Expr(ChooseExprClass, t), 1439 BuiltinLoc(BLoc), RParenLoc(RP) { 1440 SubExprs[COND] = cond; 1441 SubExprs[LHS] = lhs; 1442 SubExprs[RHS] = rhs; 1443 } 1444 1445 /// isConditionTrue - Return true if the condition is true. This is always 1446 /// statically knowable for a well-formed choosexpr. 1447 bool isConditionTrue(ASTContext &C) const; 1448 1449 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1450 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1451 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1452 1453 virtual SourceRange getSourceRange() const { 1454 return SourceRange(BuiltinLoc, RParenLoc); 1455 } 1456 static bool classof(const Stmt *T) { 1457 return T->getStmtClass() == ChooseExprClass; 1458 } 1459 static bool classof(const ChooseExpr *) { return true; } 1460 1461 // Iterators 1462 virtual child_iterator child_begin(); 1463 virtual child_iterator child_end(); 1464 1465 virtual void EmitImpl(llvm::Serializer& S) const; 1466 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1467}; 1468 1469/// GNUNullExpr - Implements the GNU __null extension, which is a name 1470/// for a null pointer constant that has integral type (e.g., int or 1471/// long) and is the same size and alignment as a pointer. The __null 1472/// extension is typically only used by system headers, which define 1473/// NULL as __null in C++ rather than using 0 (which is an integer 1474/// that may not match the size of a pointer). 1475class GNUNullExpr : public Expr { 1476 /// TokenLoc - The location of the __null keyword. 1477 SourceLocation TokenLoc; 1478 1479public: 1480 GNUNullExpr(QualType Ty, SourceLocation Loc) 1481 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1482 1483 /// getTokenLocation - The location of the __null token. 1484 SourceLocation getTokenLocation() const { return TokenLoc; } 1485 1486 virtual SourceRange getSourceRange() const { 1487 return SourceRange(TokenLoc); 1488 } 1489 static bool classof(const Stmt *T) { 1490 return T->getStmtClass() == GNUNullExprClass; 1491 } 1492 static bool classof(const GNUNullExpr *) { return true; } 1493 1494 // Iterators 1495 virtual child_iterator child_begin(); 1496 virtual child_iterator child_end(); 1497 1498 virtual void EmitImpl(llvm::Serializer& S) const; 1499 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1500}; 1501 1502/// OverloadExpr - Clang builtin function __builtin_overload. 1503/// This AST node provides a way to overload functions in C. 1504/// 1505/// The first argument is required to be a constant expression, for the number 1506/// of arguments passed to each candidate function. 1507/// 1508/// The next N arguments, where N is the value of the constant expression, 1509/// are the values to be passed as arguments. 1510/// 1511/// The rest of the arguments are values of pointer to function type, which 1512/// are the candidate functions for overloading. 1513/// 1514/// The result is a equivalent to a CallExpr taking N arguments to the 1515/// candidate function whose parameter types match the types of the N arguments. 1516/// 1517/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1518/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1519/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1520class OverloadExpr : public Expr { 1521 // SubExprs - the list of values passed to the __builtin_overload function. 1522 // SubExpr[0] is a constant expression 1523 // SubExpr[1-N] are the parameters to pass to the matching function call 1524 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1525 Stmt **SubExprs; 1526 1527 // NumExprs - the size of the SubExprs array 1528 unsigned NumExprs; 1529 1530 // The index of the matching candidate function 1531 unsigned FnIndex; 1532 1533 SourceLocation BuiltinLoc; 1534 SourceLocation RParenLoc; 1535public: 1536 OverloadExpr(ASTContext& C, Expr **args, unsigned nexprs, unsigned idx, 1537 QualType t, SourceLocation bloc, SourceLocation rploc) 1538 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1539 BuiltinLoc(bloc), RParenLoc(rploc) { 1540 SubExprs = new (C) Stmt*[nexprs]; 1541 for (unsigned i = 0; i != nexprs; ++i) 1542 SubExprs[i] = args[i]; 1543 } 1544 1545 ~OverloadExpr() {} 1546 1547 void Destroy(ASTContext& C); 1548 1549 /// arg_begin - Return a pointer to the list of arguments that will be passed 1550 /// to the matching candidate function, skipping over the initial constant 1551 /// expression. 1552 typedef ConstExprIterator const_arg_iterator; 1553 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1554 const_arg_iterator arg_end(ASTContext& Ctx) const { 1555 return &SubExprs[0]+1+getNumArgs(Ctx); 1556 } 1557 1558 /// getNumArgs - Return the number of arguments to pass to the candidate 1559 /// functions. 1560 unsigned getNumArgs(ASTContext &Ctx) const { 1561 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1562 } 1563 1564 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1565 /// constant expression, the actual arguments passed in, and the function 1566 /// pointers. 1567 unsigned getNumSubExprs() const { return NumExprs; } 1568 1569 /// getExpr - Return the Expr at the specified index. 1570 Expr *getExpr(unsigned Index) const { 1571 assert((Index < NumExprs) && "Arg access out of range!"); 1572 return cast<Expr>(SubExprs[Index]); 1573 } 1574 1575 /// getFn - Return the matching candidate function for this OverloadExpr. 1576 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1577 1578 virtual SourceRange getSourceRange() const { 1579 return SourceRange(BuiltinLoc, RParenLoc); 1580 } 1581 static bool classof(const Stmt *T) { 1582 return T->getStmtClass() == OverloadExprClass; 1583 } 1584 static bool classof(const OverloadExpr *) { return true; } 1585 1586 // Iterators 1587 virtual child_iterator child_begin(); 1588 virtual child_iterator child_end(); 1589 1590 virtual void EmitImpl(llvm::Serializer& S) const; 1591 static OverloadExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1592}; 1593 1594/// VAArgExpr, used for the builtin function __builtin_va_start. 1595class VAArgExpr : public Expr { 1596 Stmt *Val; 1597 SourceLocation BuiltinLoc, RParenLoc; 1598public: 1599 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1600 : Expr(VAArgExprClass, t), 1601 Val(e), 1602 BuiltinLoc(BLoc), 1603 RParenLoc(RPLoc) { } 1604 1605 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1606 Expr *getSubExpr() { return cast<Expr>(Val); } 1607 virtual SourceRange getSourceRange() const { 1608 return SourceRange(BuiltinLoc, RParenLoc); 1609 } 1610 static bool classof(const Stmt *T) { 1611 return T->getStmtClass() == VAArgExprClass; 1612 } 1613 static bool classof(const VAArgExpr *) { return true; } 1614 1615 // Iterators 1616 virtual child_iterator child_begin(); 1617 virtual child_iterator child_end(); 1618 1619 virtual void EmitImpl(llvm::Serializer& S) const; 1620 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1621}; 1622 1623/// @brief Describes an C or C++ initializer list. 1624/// 1625/// InitListExpr describes an initializer list, which can be used to 1626/// initialize objects of different types, including 1627/// struct/class/union types, arrays, and vectors. For example: 1628/// 1629/// @code 1630/// struct foo x = { 1, { 2, 3 } }; 1631/// @endcode 1632/// 1633/// Prior to semantic analysis, an initializer list will represent the 1634/// initializer list as written by the user, but will have the 1635/// placeholder type "void". This initializer list is called the 1636/// syntactic form of the initializer, and may contain C99 designated 1637/// initializers (represented as DesignatedInitExprs), initializations 1638/// of subobject members without explicit braces, and so on. Clients 1639/// interested in the original syntax of the initializer list should 1640/// use the syntactic form of the initializer list. 1641/// 1642/// After semantic analysis, the initializer list will represent the 1643/// semantic form of the initializer, where the initializations of all 1644/// subobjects are made explicit with nested InitListExpr nodes and 1645/// C99 designators have been eliminated by placing the designated 1646/// initializations into the subobject they initialize. Additionally, 1647/// any "holes" in the initialization, where no initializer has been 1648/// specified for a particular subobject, will be replaced with 1649/// implicitly-generated ImplicitValueInitExpr expressions that 1650/// value-initialize the subobjects. Note, however, that the 1651/// initializer lists may still have fewer initializers than there are 1652/// elements to initialize within the object. 1653/// 1654/// Given the semantic form of the initializer list, one can retrieve 1655/// the original syntactic form of that initializer list (if it 1656/// exists) using getSyntacticForm(). Since many initializer lists 1657/// have the same syntactic and semantic forms, getSyntacticForm() may 1658/// return NULL, indicating that the current initializer list also 1659/// serves as its syntactic form. 1660class InitListExpr : public Expr { 1661 std::vector<Stmt *> InitExprs; 1662 SourceLocation LBraceLoc, RBraceLoc; 1663 1664 /// Contains the initializer list that describes the syntactic form 1665 /// written in the source code. 1666 InitListExpr *SyntacticForm; 1667 1668 /// If this initializer list initializes a union, specifies which 1669 /// field within the union will be initialized. 1670 FieldDecl *UnionFieldInit; 1671 1672 /// Whether this initializer list originally had a GNU array-range 1673 /// designator in it. This is a temporary marker used by CodeGen. 1674 bool HadArrayRangeDesignator; 1675 1676public: 1677 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1678 SourceLocation rbraceloc); 1679 1680 unsigned getNumInits() const { return InitExprs.size(); } 1681 1682 const Expr* getInit(unsigned Init) const { 1683 assert(Init < getNumInits() && "Initializer access out of range!"); 1684 return cast_or_null<Expr>(InitExprs[Init]); 1685 } 1686 1687 Expr* getInit(unsigned Init) { 1688 assert(Init < getNumInits() && "Initializer access out of range!"); 1689 return cast_or_null<Expr>(InitExprs[Init]); 1690 } 1691 1692 void setInit(unsigned Init, Expr *expr) { 1693 assert(Init < getNumInits() && "Initializer access out of range!"); 1694 InitExprs[Init] = expr; 1695 } 1696 1697 /// @brief Specify the number of initializers 1698 /// 1699 /// If there are more than @p NumInits initializers, the remaining 1700 /// initializers will be destroyed. If there are fewer than @p 1701 /// NumInits initializers, NULL expressions will be added for the 1702 /// unknown initializers. 1703 void resizeInits(ASTContext &Context, unsigned NumInits); 1704 1705 /// @brief Updates the initializer at index @p Init with the new 1706 /// expression @p expr, and returns the old expression at that 1707 /// location. 1708 /// 1709 /// When @p Init is out of range for this initializer list, the 1710 /// initializer list will be extended with NULL expressions to 1711 /// accomodate the new entry. 1712 Expr *updateInit(unsigned Init, Expr *expr); 1713 1714 /// \brief If this initializes a union, specifies which field in the 1715 /// union to initialize. 1716 /// 1717 /// Typically, this field is the first named field within the 1718 /// union. However, a designated initializer can specify the 1719 /// initialization of a different field within the union. 1720 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1721 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1722 1723 // Explicit InitListExpr's originate from source code (and have valid source 1724 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1725 bool isExplicit() { 1726 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1727 } 1728 1729 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1730 1731 /// @brief Retrieve the initializer list that describes the 1732 /// syntactic form of the initializer. 1733 /// 1734 /// 1735 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1736 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1737 1738 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1739 void sawArrayRangeDesignator() { 1740 HadArrayRangeDesignator = true; 1741 } 1742 1743 virtual SourceRange getSourceRange() const { 1744 return SourceRange(LBraceLoc, RBraceLoc); 1745 } 1746 static bool classof(const Stmt *T) { 1747 return T->getStmtClass() == InitListExprClass; 1748 } 1749 static bool classof(const InitListExpr *) { return true; } 1750 1751 // Iterators 1752 virtual child_iterator child_begin(); 1753 virtual child_iterator child_end(); 1754 1755 typedef std::vector<Stmt *>::iterator iterator; 1756 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1757 1758 iterator begin() { return InitExprs.begin(); } 1759 iterator end() { return InitExprs.end(); } 1760 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1761 reverse_iterator rend() { return InitExprs.rend(); } 1762 1763 // Serailization. 1764 virtual void EmitImpl(llvm::Serializer& S) const; 1765 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1766 1767private: 1768 // Used by serializer. 1769 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1770}; 1771 1772/// @brief Represents a C99 designated initializer expression. 1773/// 1774/// A designated initializer expression (C99 6.7.8) contains one or 1775/// more designators (which can be field designators, array 1776/// designators, or GNU array-range designators) followed by an 1777/// expression that initializes the field or element(s) that the 1778/// designators refer to. For example, given: 1779/// 1780/// @code 1781/// struct point { 1782/// double x; 1783/// double y; 1784/// }; 1785/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1786/// @endcode 1787/// 1788/// The InitListExpr contains three DesignatedInitExprs, the first of 1789/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1790/// designators, one array designator for @c [2] followed by one field 1791/// designator for @c .y. The initalization expression will be 1.0. 1792class DesignatedInitExpr : public Expr { 1793 /// The location of the '=' or ':' prior to the actual initializer 1794 /// expression. 1795 SourceLocation EqualOrColonLoc; 1796 1797 /// Whether this designated initializer used the GNU deprecated ':' 1798 /// syntax rather than the C99 '=' syntax. 1799 bool UsesColonSyntax : 1; 1800 1801 /// The number of designators in this initializer expression. 1802 unsigned NumDesignators : 15; 1803 1804 /// The number of subexpressions of this initializer expression, 1805 /// which contains both the initializer and any additional 1806 /// expressions used by array and array-range designators. 1807 unsigned NumSubExprs : 16; 1808 1809 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1810 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1811 unsigned NumSubExprs) 1812 : Expr(DesignatedInitExprClass, Ty), 1813 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1814 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1815 1816public: 1817 /// A field designator, e.g., ".x". 1818 struct FieldDesignator { 1819 /// Refers to the field that is being initialized. The low bit 1820 /// of this field determines whether this is actually a pointer 1821 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1822 /// initially constructed, a field designator will store an 1823 /// IdentifierInfo*. After semantic analysis has resolved that 1824 /// name, the field designator will instead store a FieldDecl*. 1825 uintptr_t NameOrField; 1826 1827 /// The location of the '.' in the designated initializer. 1828 unsigned DotLoc; 1829 1830 /// The location of the field name in the designated initializer. 1831 unsigned FieldLoc; 1832 }; 1833 1834 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1835 struct ArrayOrRangeDesignator { 1836 /// Location of the first index expression within the designated 1837 /// initializer expression's list of subexpressions. 1838 unsigned Index; 1839 /// The location of the '[' starting the array range designator. 1840 unsigned LBracketLoc; 1841 /// The location of the ellipsis separating the start and end 1842 /// indices. Only valid for GNU array-range designators. 1843 unsigned EllipsisLoc; 1844 /// The location of the ']' terminating the array range designator. 1845 unsigned RBracketLoc; 1846 }; 1847 1848 /// @brief Represents a single C99 designator. 1849 /// 1850 /// @todo This class is infuriatingly similar to clang::Designator, 1851 /// but minor differences (storing indices vs. storing pointers) 1852 /// keep us from reusing it. Try harder, later, to rectify these 1853 /// differences. 1854 class Designator { 1855 /// @brief The kind of designator this describes. 1856 enum { 1857 FieldDesignator, 1858 ArrayDesignator, 1859 ArrayRangeDesignator 1860 } Kind; 1861 1862 union { 1863 /// A field designator, e.g., ".x". 1864 struct FieldDesignator Field; 1865 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1866 struct ArrayOrRangeDesignator ArrayOrRange; 1867 }; 1868 friend class DesignatedInitExpr; 1869 1870 public: 1871 /// @brief Initializes a field designator. 1872 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1873 SourceLocation FieldLoc) 1874 : Kind(FieldDesignator) { 1875 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1876 Field.DotLoc = DotLoc.getRawEncoding(); 1877 Field.FieldLoc = FieldLoc.getRawEncoding(); 1878 } 1879 1880 /// @brief Initializes an array designator. 1881 Designator(unsigned Index, SourceLocation LBracketLoc, 1882 SourceLocation RBracketLoc) 1883 : Kind(ArrayDesignator) { 1884 ArrayOrRange.Index = Index; 1885 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1886 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1887 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1888 } 1889 1890 /// @brief Initializes a GNU array-range designator. 1891 Designator(unsigned Index, SourceLocation LBracketLoc, 1892 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1893 : Kind(ArrayRangeDesignator) { 1894 ArrayOrRange.Index = Index; 1895 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1896 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1897 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1898 } 1899 1900 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1901 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1902 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1903 1904 IdentifierInfo * getFieldName(); 1905 1906 FieldDecl *getField() { 1907 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1908 if (Field.NameOrField & 0x01) 1909 return 0; 1910 else 1911 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1912 } 1913 1914 void setField(FieldDecl *FD) { 1915 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1916 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1917 } 1918 1919 SourceLocation getDotLoc() const { 1920 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1921 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1922 } 1923 1924 SourceLocation getFieldLoc() const { 1925 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1926 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1927 } 1928 1929 SourceLocation getLBracketLoc() const { 1930 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1931 "Only valid on an array or array-range designator"); 1932 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1933 } 1934 1935 SourceLocation getRBracketLoc() const { 1936 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1937 "Only valid on an array or array-range designator"); 1938 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1939 } 1940 1941 SourceLocation getEllipsisLoc() const { 1942 assert(Kind == ArrayRangeDesignator && 1943 "Only valid on an array-range designator"); 1944 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 1945 } 1946 1947 SourceLocation getStartLocation() const { 1948 if (Kind == FieldDesignator) 1949 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 1950 else 1951 return getLBracketLoc(); 1952 } 1953 }; 1954 1955 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 1956 unsigned NumDesignators, 1957 Expr **IndexExprs, unsigned NumIndexExprs, 1958 SourceLocation EqualOrColonLoc, 1959 bool UsesColonSyntax, Expr *Init); 1960 1961 /// @brief Returns the number of designators in this initializer. 1962 unsigned size() const { return NumDesignators; } 1963 1964 // Iterator access to the designators. 1965 typedef Designator* designators_iterator; 1966 designators_iterator designators_begin(); 1967 designators_iterator designators_end(); 1968 1969 Expr *getArrayIndex(const Designator& D); 1970 Expr *getArrayRangeStart(const Designator& D); 1971 Expr *getArrayRangeEnd(const Designator& D); 1972 1973 /// @brief Retrieve the location of the '=' that precedes the 1974 /// initializer value itself, if present. 1975 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 1976 1977 /// @brief Determines whether this designated initializer used the 1978 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 1979 bool usesColonSyntax() const { return UsesColonSyntax; } 1980 1981 /// @brief Retrieve the initializer value. 1982 Expr *getInit() const { 1983 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 1984 } 1985 1986 void setInit(Expr *init) { 1987 *child_begin() = init; 1988 } 1989 1990 virtual SourceRange getSourceRange() const; 1991 1992 static bool classof(const Stmt *T) { 1993 return T->getStmtClass() == DesignatedInitExprClass; 1994 } 1995 static bool classof(const DesignatedInitExpr *) { return true; } 1996 1997 // Iterators 1998 virtual child_iterator child_begin(); 1999 virtual child_iterator child_end(); 2000}; 2001 2002/// \brief Represents an implicitly-generated value initialization of 2003/// an object of a given type. 2004/// 2005/// Implicit value initializations occur within semantic initializer 2006/// list expressions (InitListExpr) as placeholders for subobject 2007/// initializations not explicitly specified by the user. 2008/// 2009/// \see InitListExpr 2010class ImplicitValueInitExpr : public Expr { 2011public: 2012 explicit ImplicitValueInitExpr(QualType ty) 2013 : Expr(ImplicitValueInitExprClass, ty) { } 2014 2015 static bool classof(const Stmt *T) { 2016 return T->getStmtClass() == ImplicitValueInitExprClass; 2017 } 2018 static bool classof(const ImplicitValueInitExpr *) { return true; } 2019 2020 virtual SourceRange getSourceRange() const { 2021 return SourceRange(); 2022 } 2023 2024 // Iterators 2025 virtual child_iterator child_begin(); 2026 virtual child_iterator child_end(); 2027}; 2028 2029//===----------------------------------------------------------------------===// 2030// Clang Extensions 2031//===----------------------------------------------------------------------===// 2032 2033 2034/// ExtVectorElementExpr - This represents access to specific elements of a 2035/// vector, and may occur on the left hand side or right hand side. For example 2036/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2037/// 2038class ExtVectorElementExpr : public Expr { 2039 Stmt *Base; 2040 IdentifierInfo &Accessor; 2041 SourceLocation AccessorLoc; 2042public: 2043 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2044 SourceLocation loc) 2045 : Expr(ExtVectorElementExprClass, ty), 2046 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2047 2048 const Expr *getBase() const { return cast<Expr>(Base); } 2049 Expr *getBase() { return cast<Expr>(Base); } 2050 2051 IdentifierInfo &getAccessor() const { return Accessor; } 2052 2053 /// getNumElements - Get the number of components being selected. 2054 unsigned getNumElements() const; 2055 2056 /// containsDuplicateElements - Return true if any element access is 2057 /// repeated. 2058 bool containsDuplicateElements() const; 2059 2060 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2061 /// aggregate Constant of ConstantInt(s). 2062 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2063 2064 virtual SourceRange getSourceRange() const { 2065 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2066 } 2067 2068 static bool classof(const Stmt *T) { 2069 return T->getStmtClass() == ExtVectorElementExprClass; 2070 } 2071 static bool classof(const ExtVectorElementExpr *) { return true; } 2072 2073 // Iterators 2074 virtual child_iterator child_begin(); 2075 virtual child_iterator child_end(); 2076 2077 virtual void EmitImpl(llvm::Serializer& S) const; 2078 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2079}; 2080 2081 2082/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2083/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2084class BlockExpr : public Expr { 2085protected: 2086 BlockDecl *TheBlock; 2087public: 2088 BlockExpr(BlockDecl *BD, QualType ty) : Expr(BlockExprClass, ty), 2089 TheBlock(BD) {} 2090 2091 BlockDecl *getBlockDecl() { return TheBlock; } 2092 2093 // Convenience functions for probing the underlying BlockDecl. 2094 SourceLocation getCaretLocation() const; 2095 const Stmt *getBody() const; 2096 Stmt *getBody(); 2097 2098 virtual SourceRange getSourceRange() const { 2099 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2100 } 2101 2102 /// getFunctionType - Return the underlying function type for this block. 2103 const FunctionType *getFunctionType() const; 2104 2105 static bool classof(const Stmt *T) { 2106 return T->getStmtClass() == BlockExprClass; 2107 } 2108 static bool classof(const BlockExpr *) { return true; } 2109 2110 // Iterators 2111 virtual child_iterator child_begin(); 2112 virtual child_iterator child_end(); 2113 2114 virtual void EmitImpl(llvm::Serializer& S) const; 2115 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2116}; 2117 2118/// BlockDeclRefExpr - A reference to a declared variable, function, 2119/// enum, etc. 2120class BlockDeclRefExpr : public Expr { 2121 ValueDecl *D; 2122 SourceLocation Loc; 2123 bool IsByRef; 2124public: 2125 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2126 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2127 2128 ValueDecl *getDecl() { return D; } 2129 const ValueDecl *getDecl() const { return D; } 2130 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2131 2132 bool isByRef() const { return IsByRef; } 2133 2134 static bool classof(const Stmt *T) { 2135 return T->getStmtClass() == BlockDeclRefExprClass; 2136 } 2137 static bool classof(const BlockDeclRefExpr *) { return true; } 2138 2139 // Iterators 2140 virtual child_iterator child_begin(); 2141 virtual child_iterator child_end(); 2142 2143 virtual void EmitImpl(llvm::Serializer& S) const; 2144 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2145}; 2146 2147} // end namespace clang 2148 2149#endif 2150