Expr.h revision 224605064a4ef87d1c3d35ad1cb363f8b534012b
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() { 780 delete [] SubExprs; 781 } 782 783 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 784 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 785 void setCallee(Expr *F) { SubExprs[FN] = F; } 786 787 /// getNumArgs - Return the number of actual arguments to this call. 788 /// 789 unsigned getNumArgs() const { return NumArgs; } 790 791 /// getArg - Return the specified argument. 792 Expr *getArg(unsigned Arg) { 793 assert(Arg < NumArgs && "Arg access out of range!"); 794 return cast<Expr>(SubExprs[Arg+ARGS_START]); 795 } 796 const Expr *getArg(unsigned Arg) const { 797 assert(Arg < NumArgs && "Arg access out of range!"); 798 return cast<Expr>(SubExprs[Arg+ARGS_START]); 799 } 800 /// setArg - Set the specified argument. 801 void setArg(unsigned Arg, Expr *ArgExpr) { 802 assert(Arg < NumArgs && "Arg access out of range!"); 803 SubExprs[Arg+ARGS_START] = ArgExpr; 804 } 805 806 /// setNumArgs - This changes the number of arguments present in this call. 807 /// Any orphaned expressions are deleted by this, and any new operands are set 808 /// to null. 809 void setNumArgs(unsigned NumArgs); 810 811 typedef ExprIterator arg_iterator; 812 typedef ConstExprIterator const_arg_iterator; 813 814 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 815 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 816 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 817 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 818 819 /// getNumCommas - Return the number of commas that must have been present in 820 /// this function call. 821 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 822 823 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 824 /// not, return 0. 825 unsigned isBuiltinCall() const; 826 827 SourceLocation getRParenLoc() const { return RParenLoc; } 828 829 virtual SourceRange getSourceRange() const { 830 return SourceRange(getCallee()->getLocStart(), RParenLoc); 831 } 832 833 static bool classof(const Stmt *T) { 834 return T->getStmtClass() == CallExprClass || 835 T->getStmtClass() == CXXOperatorCallExprClass || 836 T->getStmtClass() == CXXMemberCallExprClass; 837 } 838 static bool classof(const CallExpr *) { return true; } 839 static bool classof(const CXXOperatorCallExpr *) { return true; } 840 static bool classof(const CXXMemberCallExpr *) { return true; } 841 842 // Iterators 843 virtual child_iterator child_begin(); 844 virtual child_iterator child_end(); 845 846 virtual void EmitImpl(llvm::Serializer& S) const; 847 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 848 StmtClass SC); 849}; 850 851/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 852/// 853class MemberExpr : public Expr { 854 Stmt *Base; 855 NamedDecl *MemberDecl; 856 SourceLocation MemberLoc; 857 bool IsArrow; // True if this is "X->F", false if this is "X.F". 858public: 859 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 860 QualType ty) 861 : Expr(MemberExprClass, ty), 862 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 863 864 void setBase(Expr *E) { Base = E; } 865 Expr *getBase() const { return cast<Expr>(Base); } 866 NamedDecl *getMemberDecl() const { return MemberDecl; } 867 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 868 bool isArrow() const { return IsArrow; } 869 870 virtual SourceRange getSourceRange() const { 871 return SourceRange(getBase()->getLocStart(), MemberLoc); 872 } 873 874 virtual SourceLocation getExprLoc() const { return MemberLoc; } 875 876 static bool classof(const Stmt *T) { 877 return T->getStmtClass() == MemberExprClass; 878 } 879 static bool classof(const MemberExpr *) { return true; } 880 881 // Iterators 882 virtual child_iterator child_begin(); 883 virtual child_iterator child_end(); 884 885 virtual void EmitImpl(llvm::Serializer& S) const; 886 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 887}; 888 889/// CompoundLiteralExpr - [C99 6.5.2.5] 890/// 891class CompoundLiteralExpr : public Expr { 892 /// LParenLoc - If non-null, this is the location of the left paren in a 893 /// compound literal like "(int){4}". This can be null if this is a 894 /// synthesized compound expression. 895 SourceLocation LParenLoc; 896 Stmt *Init; 897 bool FileScope; 898public: 899 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 900 bool fileScope) 901 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 902 FileScope(fileScope) {} 903 904 const Expr *getInitializer() const { return cast<Expr>(Init); } 905 Expr *getInitializer() { return cast<Expr>(Init); } 906 907 bool isFileScope() const { return FileScope; } 908 909 SourceLocation getLParenLoc() const { return LParenLoc; } 910 911 virtual SourceRange getSourceRange() const { 912 // FIXME: Init should never be null. 913 if (!Init) 914 return SourceRange(); 915 if (LParenLoc.isInvalid()) 916 return Init->getSourceRange(); 917 return SourceRange(LParenLoc, Init->getLocEnd()); 918 } 919 920 static bool classof(const Stmt *T) { 921 return T->getStmtClass() == CompoundLiteralExprClass; 922 } 923 static bool classof(const CompoundLiteralExpr *) { return true; } 924 925 // Iterators 926 virtual child_iterator child_begin(); 927 virtual child_iterator child_end(); 928 929 virtual void EmitImpl(llvm::Serializer& S) const; 930 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 931}; 932 933/// CastExpr - Base class for type casts, including both implicit 934/// casts (ImplicitCastExpr) and explicit casts that have some 935/// representation in the source code (ExplicitCastExpr's derived 936/// classes). 937class CastExpr : public Expr { 938 Stmt *Op; 939protected: 940 CastExpr(StmtClass SC, QualType ty, Expr *op) : 941 Expr(SC, ty, 942 // Cast expressions are type-dependent if the type is 943 // dependent (C++ [temp.dep.expr]p3). 944 ty->isDependentType(), 945 // Cast expressions are value-dependent if the type is 946 // dependent or if the subexpression is value-dependent. 947 ty->isDependentType() || (op && op->isValueDependent())), 948 Op(op) {} 949 950public: 951 Expr *getSubExpr() { return cast<Expr>(Op); } 952 const Expr *getSubExpr() const { return cast<Expr>(Op); } 953 954 static bool classof(const Stmt *T) { 955 StmtClass SC = T->getStmtClass(); 956 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 957 return true; 958 959 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 960 return true; 961 962 return false; 963 } 964 static bool classof(const CastExpr *) { return true; } 965 966 // Iterators 967 virtual child_iterator child_begin(); 968 virtual child_iterator child_end(); 969}; 970 971/// ImplicitCastExpr - Allows us to explicitly represent implicit type 972/// conversions, which have no direct representation in the original 973/// source code. For example: converting T[]->T*, void f()->void 974/// (*f)(), float->double, short->int, etc. 975/// 976/// In C, implicit casts always produce rvalues. However, in C++, an 977/// implicit cast whose result is being bound to a reference will be 978/// an lvalue. For example: 979/// 980/// @code 981/// class Base { }; 982/// class Derived : public Base { }; 983/// void f(Derived d) { 984/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 985/// } 986/// @endcode 987class ImplicitCastExpr : public CastExpr { 988 /// LvalueCast - Whether this cast produces an lvalue. 989 bool LvalueCast; 990 991public: 992 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 993 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 994 995 virtual SourceRange getSourceRange() const { 996 return getSubExpr()->getSourceRange(); 997 } 998 999 /// isLvalueCast - Whether this cast produces an lvalue. 1000 bool isLvalueCast() const { return LvalueCast; } 1001 1002 /// setLvalueCast - Set whether this cast produces an lvalue. 1003 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1004 1005 static bool classof(const Stmt *T) { 1006 return T->getStmtClass() == ImplicitCastExprClass; 1007 } 1008 static bool classof(const ImplicitCastExpr *) { return true; } 1009 1010 virtual void EmitImpl(llvm::Serializer& S) const; 1011 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1012}; 1013 1014/// ExplicitCastExpr - An explicit cast written in the source 1015/// code. 1016/// 1017/// This class is effectively an abstract class, because it provides 1018/// the basic representation of an explicitly-written cast without 1019/// specifying which kind of cast (C cast, functional cast, static 1020/// cast, etc.) was written; specific derived classes represent the 1021/// particular style of cast and its location information. 1022/// 1023/// Unlike implicit casts, explicit cast nodes have two different 1024/// types: the type that was written into the source code, and the 1025/// actual type of the expression as determined by semantic 1026/// analysis. These types may differ slightly. For example, in C++ one 1027/// can cast to a reference type, which indicates that the resulting 1028/// expression will be an lvalue. The reference type, however, will 1029/// not be used as the type of the expression. 1030class ExplicitCastExpr : public CastExpr { 1031 /// TypeAsWritten - The type that this expression is casting to, as 1032 /// written in the source code. 1033 QualType TypeAsWritten; 1034 1035protected: 1036 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1037 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1038 1039public: 1040 /// getTypeAsWritten - Returns the type that this expression is 1041 /// casting to, as written in the source code. 1042 QualType getTypeAsWritten() const { return TypeAsWritten; } 1043 1044 static bool classof(const Stmt *T) { 1045 StmtClass SC = T->getStmtClass(); 1046 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1047 return true; 1048 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1049 return true; 1050 1051 return false; 1052 } 1053 static bool classof(const ExplicitCastExpr *) { return true; } 1054}; 1055 1056/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1057/// cast in C++ (C++ [expr.cast]), which uses the syntax 1058/// (Type)expr. For example: @c (int)f. 1059class CStyleCastExpr : public ExplicitCastExpr { 1060 SourceLocation LPLoc; // the location of the left paren 1061 SourceLocation RPLoc; // the location of the right paren 1062public: 1063 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1064 SourceLocation l, SourceLocation r) : 1065 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1066 LPLoc(l), RPLoc(r) {} 1067 1068 SourceLocation getLParenLoc() const { return LPLoc; } 1069 SourceLocation getRParenLoc() const { return RPLoc; } 1070 1071 virtual SourceRange getSourceRange() const { 1072 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1073 } 1074 static bool classof(const Stmt *T) { 1075 return T->getStmtClass() == CStyleCastExprClass; 1076 } 1077 static bool classof(const CStyleCastExpr *) { return true; } 1078 1079 virtual void EmitImpl(llvm::Serializer& S) const; 1080 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1081}; 1082 1083class BinaryOperator : public Expr { 1084public: 1085 enum Opcode { 1086 // Operators listed in order of precedence. 1087 // Note that additions to this should also update the StmtVisitor class. 1088 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1089 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1090 Add, Sub, // [C99 6.5.6] Additive operators. 1091 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1092 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1093 EQ, NE, // [C99 6.5.9] Equality operators. 1094 And, // [C99 6.5.10] Bitwise AND operator. 1095 Xor, // [C99 6.5.11] Bitwise XOR operator. 1096 Or, // [C99 6.5.12] Bitwise OR operator. 1097 LAnd, // [C99 6.5.13] Logical AND operator. 1098 LOr, // [C99 6.5.14] Logical OR operator. 1099 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1100 DivAssign, RemAssign, 1101 AddAssign, SubAssign, 1102 ShlAssign, ShrAssign, 1103 AndAssign, XorAssign, 1104 OrAssign, 1105 Comma // [C99 6.5.17] Comma operator. 1106 }; 1107private: 1108 enum { LHS, RHS, END_EXPR }; 1109 Stmt* SubExprs[END_EXPR]; 1110 Opcode Opc; 1111 SourceLocation OpLoc; 1112public: 1113 1114 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1115 SourceLocation opLoc) 1116 : Expr(BinaryOperatorClass, ResTy, 1117 lhs->isTypeDependent() || rhs->isTypeDependent(), 1118 lhs->isValueDependent() || rhs->isValueDependent()), 1119 Opc(opc), OpLoc(opLoc) { 1120 SubExprs[LHS] = lhs; 1121 SubExprs[RHS] = rhs; 1122 assert(!isCompoundAssignmentOp() && 1123 "Use ArithAssignBinaryOperator for compound assignments"); 1124 } 1125 1126 SourceLocation getOperatorLoc() const { return OpLoc; } 1127 Opcode getOpcode() const { return Opc; } 1128 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1129 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1130 virtual SourceRange getSourceRange() const { 1131 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1132 } 1133 1134 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1135 /// corresponds to, e.g. "<<=". 1136 static const char *getOpcodeStr(Opcode Op); 1137 1138 /// predicates to categorize the respective opcodes. 1139 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1140 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1141 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1142 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1143 1144 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1145 bool isRelationalOp() const { return isRelationalOp(Opc); } 1146 1147 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1148 bool isEqualityOp() const { return isEqualityOp(Opc); } 1149 1150 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1151 bool isLogicalOp() const { return isLogicalOp(Opc); } 1152 1153 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1154 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1155 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1156 1157 static bool classof(const Stmt *S) { 1158 return S->getStmtClass() == BinaryOperatorClass || 1159 S->getStmtClass() == CompoundAssignOperatorClass; 1160 } 1161 static bool classof(const BinaryOperator *) { return true; } 1162 1163 // Iterators 1164 virtual child_iterator child_begin(); 1165 virtual child_iterator child_end(); 1166 1167 virtual void EmitImpl(llvm::Serializer& S) const; 1168 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1169 1170protected: 1171 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1172 SourceLocation oploc, bool dead) 1173 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1174 SubExprs[LHS] = lhs; 1175 SubExprs[RHS] = rhs; 1176 } 1177}; 1178 1179/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1180/// track of the type the operation is performed in. Due to the semantics of 1181/// these operators, the operands are promoted, the aritmetic performed, an 1182/// implicit conversion back to the result type done, then the assignment takes 1183/// place. This captures the intermediate type which the computation is done 1184/// in. 1185class CompoundAssignOperator : public BinaryOperator { 1186 QualType ComputationType; 1187public: 1188 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1189 QualType ResType, QualType CompType, 1190 SourceLocation OpLoc) 1191 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1192 ComputationType(CompType) { 1193 assert(isCompoundAssignmentOp() && 1194 "Only should be used for compound assignments"); 1195 } 1196 1197 QualType getComputationType() const { return ComputationType; } 1198 1199 static bool classof(const CompoundAssignOperator *) { return true; } 1200 static bool classof(const Stmt *S) { 1201 return S->getStmtClass() == CompoundAssignOperatorClass; 1202 } 1203 1204 virtual void EmitImpl(llvm::Serializer& S) const; 1205 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1206 ASTContext& C); 1207}; 1208 1209/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1210/// GNU "missing LHS" extension is in use. 1211/// 1212class ConditionalOperator : public Expr { 1213 enum { COND, LHS, RHS, END_EXPR }; 1214 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1215public: 1216 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1217 : Expr(ConditionalOperatorClass, t, 1218 // FIXME: the type of the conditional operator doesn't 1219 // depend on the type of the conditional, but the standard 1220 // seems to imply that it could. File a bug! 1221 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1222 (cond->isValueDependent() || 1223 (lhs && lhs->isValueDependent()) || 1224 (rhs && rhs->isValueDependent()))) { 1225 SubExprs[COND] = cond; 1226 SubExprs[LHS] = lhs; 1227 SubExprs[RHS] = rhs; 1228 } 1229 1230 // getCond - Return the expression representing the condition for 1231 // the ?: operator. 1232 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1233 1234 // getTrueExpr - Return the subexpression representing the value of the ?: 1235 // expression if the condition evaluates to true. In most cases this value 1236 // will be the same as getLHS() except a GCC extension allows the left 1237 // subexpression to be omitted, and instead of the condition be returned. 1238 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1239 // is only evaluated once. 1240 Expr *getTrueExpr() const { 1241 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1242 } 1243 1244 // getTrueExpr - Return the subexpression representing the value of the ?: 1245 // expression if the condition evaluates to false. This is the same as getRHS. 1246 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1247 1248 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1249 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1250 1251 virtual SourceRange getSourceRange() const { 1252 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1253 } 1254 static bool classof(const Stmt *T) { 1255 return T->getStmtClass() == ConditionalOperatorClass; 1256 } 1257 static bool classof(const ConditionalOperator *) { return true; } 1258 1259 // Iterators 1260 virtual child_iterator child_begin(); 1261 virtual child_iterator child_end(); 1262 1263 virtual void EmitImpl(llvm::Serializer& S) const; 1264 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1265}; 1266 1267/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1268class AddrLabelExpr : public Expr { 1269 SourceLocation AmpAmpLoc, LabelLoc; 1270 LabelStmt *Label; 1271public: 1272 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1273 QualType t) 1274 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1275 1276 virtual SourceRange getSourceRange() const { 1277 return SourceRange(AmpAmpLoc, LabelLoc); 1278 } 1279 1280 LabelStmt *getLabel() const { return Label; } 1281 1282 static bool classof(const Stmt *T) { 1283 return T->getStmtClass() == AddrLabelExprClass; 1284 } 1285 static bool classof(const AddrLabelExpr *) { return true; } 1286 1287 // Iterators 1288 virtual child_iterator child_begin(); 1289 virtual child_iterator child_end(); 1290 1291 virtual void EmitImpl(llvm::Serializer& S) const; 1292 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1293}; 1294 1295/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1296/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1297/// takes the value of the last subexpression. 1298class StmtExpr : public Expr { 1299 Stmt *SubStmt; 1300 SourceLocation LParenLoc, RParenLoc; 1301public: 1302 StmtExpr(CompoundStmt *substmt, QualType T, 1303 SourceLocation lp, SourceLocation rp) : 1304 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1305 1306 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1307 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1308 1309 virtual SourceRange getSourceRange() const { 1310 return SourceRange(LParenLoc, RParenLoc); 1311 } 1312 1313 static bool classof(const Stmt *T) { 1314 return T->getStmtClass() == StmtExprClass; 1315 } 1316 static bool classof(const StmtExpr *) { return true; } 1317 1318 // Iterators 1319 virtual child_iterator child_begin(); 1320 virtual child_iterator child_end(); 1321 1322 virtual void EmitImpl(llvm::Serializer& S) const; 1323 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1324}; 1325 1326/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1327/// This AST node represents a function that returns 1 if two *types* (not 1328/// expressions) are compatible. The result of this built-in function can be 1329/// used in integer constant expressions. 1330class TypesCompatibleExpr : public Expr { 1331 QualType Type1; 1332 QualType Type2; 1333 SourceLocation BuiltinLoc, RParenLoc; 1334public: 1335 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1336 QualType t1, QualType t2, SourceLocation RP) : 1337 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1338 BuiltinLoc(BLoc), RParenLoc(RP) {} 1339 1340 QualType getArgType1() const { return Type1; } 1341 QualType getArgType2() const { return Type2; } 1342 1343 virtual SourceRange getSourceRange() const { 1344 return SourceRange(BuiltinLoc, RParenLoc); 1345 } 1346 static bool classof(const Stmt *T) { 1347 return T->getStmtClass() == TypesCompatibleExprClass; 1348 } 1349 static bool classof(const TypesCompatibleExpr *) { return true; } 1350 1351 // Iterators 1352 virtual child_iterator child_begin(); 1353 virtual child_iterator child_end(); 1354 1355 virtual void EmitImpl(llvm::Serializer& S) const; 1356 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1357}; 1358 1359/// ShuffleVectorExpr - clang-specific builtin-in function 1360/// __builtin_shufflevector. 1361/// This AST node represents a operator that does a constant 1362/// shuffle, similar to LLVM's shufflevector instruction. It takes 1363/// two vectors and a variable number of constant indices, 1364/// and returns the appropriately shuffled vector. 1365class ShuffleVectorExpr : public Expr { 1366 SourceLocation BuiltinLoc, RParenLoc; 1367 1368 // SubExprs - the list of values passed to the __builtin_shufflevector 1369 // function. The first two are vectors, and the rest are constant 1370 // indices. The number of values in this list is always 1371 // 2+the number of indices in the vector type. 1372 Stmt **SubExprs; 1373 unsigned NumExprs; 1374 1375public: 1376 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1377 QualType Type, SourceLocation BLoc, 1378 SourceLocation RP) : 1379 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1380 RParenLoc(RP), NumExprs(nexpr) { 1381 1382 SubExprs = new Stmt*[nexpr]; 1383 for (unsigned i = 0; i < nexpr; i++) 1384 SubExprs[i] = args[i]; 1385 } 1386 1387 virtual SourceRange getSourceRange() const { 1388 return SourceRange(BuiltinLoc, RParenLoc); 1389 } 1390 static bool classof(const Stmt *T) { 1391 return T->getStmtClass() == ShuffleVectorExprClass; 1392 } 1393 static bool classof(const ShuffleVectorExpr *) { return true; } 1394 1395 ~ShuffleVectorExpr() { 1396 delete [] SubExprs; 1397 } 1398 1399 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1400 /// constant expression, the actual arguments passed in, and the function 1401 /// pointers. 1402 unsigned getNumSubExprs() const { return NumExprs; } 1403 1404 /// getExpr - Return the Expr at the specified index. 1405 Expr *getExpr(unsigned Index) { 1406 assert((Index < NumExprs) && "Arg access out of range!"); 1407 return cast<Expr>(SubExprs[Index]); 1408 } 1409 const Expr *getExpr(unsigned Index) const { 1410 assert((Index < NumExprs) && "Arg access out of range!"); 1411 return cast<Expr>(SubExprs[Index]); 1412 } 1413 1414 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1415 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1416 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1417 } 1418 1419 // Iterators 1420 virtual child_iterator child_begin(); 1421 virtual child_iterator child_end(); 1422 1423 virtual void EmitImpl(llvm::Serializer& S) const; 1424 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1425}; 1426 1427/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1428/// This AST node is similar to the conditional operator (?:) in C, with 1429/// the following exceptions: 1430/// - the test expression must be a constant expression. 1431/// - the expression returned has it's type unaltered by promotion rules. 1432/// - does not evaluate the expression that was not chosen. 1433class ChooseExpr : public Expr { 1434 enum { COND, LHS, RHS, END_EXPR }; 1435 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1436 SourceLocation BuiltinLoc, RParenLoc; 1437public: 1438 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1439 SourceLocation RP) 1440 : Expr(ChooseExprClass, t), 1441 BuiltinLoc(BLoc), RParenLoc(RP) { 1442 SubExprs[COND] = cond; 1443 SubExprs[LHS] = lhs; 1444 SubExprs[RHS] = rhs; 1445 } 1446 1447 /// isConditionTrue - Return true if the condition is true. This is always 1448 /// statically knowable for a well-formed choosexpr. 1449 bool isConditionTrue(ASTContext &C) const; 1450 1451 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1452 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1453 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1454 1455 virtual SourceRange getSourceRange() const { 1456 return SourceRange(BuiltinLoc, RParenLoc); 1457 } 1458 static bool classof(const Stmt *T) { 1459 return T->getStmtClass() == ChooseExprClass; 1460 } 1461 static bool classof(const ChooseExpr *) { return true; } 1462 1463 // Iterators 1464 virtual child_iterator child_begin(); 1465 virtual child_iterator child_end(); 1466 1467 virtual void EmitImpl(llvm::Serializer& S) const; 1468 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1469}; 1470 1471/// GNUNullExpr - Implements the GNU __null extension, which is a name 1472/// for a null pointer constant that has integral type (e.g., int or 1473/// long) and is the same size and alignment as a pointer. The __null 1474/// extension is typically only used by system headers, which define 1475/// NULL as __null in C++ rather than using 0 (which is an integer 1476/// that may not match the size of a pointer). 1477class GNUNullExpr : public Expr { 1478 /// TokenLoc - The location of the __null keyword. 1479 SourceLocation TokenLoc; 1480 1481public: 1482 GNUNullExpr(QualType Ty, SourceLocation Loc) 1483 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1484 1485 /// getTokenLocation - The location of the __null token. 1486 SourceLocation getTokenLocation() const { return TokenLoc; } 1487 1488 virtual SourceRange getSourceRange() const { 1489 return SourceRange(TokenLoc); 1490 } 1491 static bool classof(const Stmt *T) { 1492 return T->getStmtClass() == GNUNullExprClass; 1493 } 1494 static bool classof(const GNUNullExpr *) { return true; } 1495 1496 // Iterators 1497 virtual child_iterator child_begin(); 1498 virtual child_iterator child_end(); 1499 1500 virtual void EmitImpl(llvm::Serializer& S) const; 1501 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1502}; 1503 1504/// OverloadExpr - Clang builtin function __builtin_overload. 1505/// This AST node provides a way to overload functions in C. 1506/// 1507/// The first argument is required to be a constant expression, for the number 1508/// of arguments passed to each candidate function. 1509/// 1510/// The next N arguments, where N is the value of the constant expression, 1511/// are the values to be passed as arguments. 1512/// 1513/// The rest of the arguments are values of pointer to function type, which 1514/// are the candidate functions for overloading. 1515/// 1516/// The result is a equivalent to a CallExpr taking N arguments to the 1517/// candidate function whose parameter types match the types of the N arguments. 1518/// 1519/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1520/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1521/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1522class OverloadExpr : public Expr { 1523 // SubExprs - the list of values passed to the __builtin_overload function. 1524 // SubExpr[0] is a constant expression 1525 // SubExpr[1-N] are the parameters to pass to the matching function call 1526 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1527 Stmt **SubExprs; 1528 1529 // NumExprs - the size of the SubExprs array 1530 unsigned NumExprs; 1531 1532 // The index of the matching candidate function 1533 unsigned FnIndex; 1534 1535 SourceLocation BuiltinLoc; 1536 SourceLocation RParenLoc; 1537public: 1538 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1539 SourceLocation bloc, SourceLocation rploc) 1540 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1541 BuiltinLoc(bloc), RParenLoc(rploc) { 1542 SubExprs = new Stmt*[nexprs]; 1543 for (unsigned i = 0; i != nexprs; ++i) 1544 SubExprs[i] = args[i]; 1545 } 1546 ~OverloadExpr() { 1547 delete [] SubExprs; 1548 } 1549 1550 /// arg_begin - Return a pointer to the list of arguments that will be passed 1551 /// to the matching candidate function, skipping over the initial constant 1552 /// expression. 1553 typedef ConstExprIterator const_arg_iterator; 1554 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1555 const_arg_iterator arg_end(ASTContext& Ctx) const { 1556 return &SubExprs[0]+1+getNumArgs(Ctx); 1557 } 1558 1559 /// getNumArgs - Return the number of arguments to pass to the candidate 1560 /// functions. 1561 unsigned getNumArgs(ASTContext &Ctx) const { 1562 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1563 } 1564 1565 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1566 /// constant expression, the actual arguments passed in, and the function 1567 /// pointers. 1568 unsigned getNumSubExprs() const { return NumExprs; } 1569 1570 /// getExpr - Return the Expr at the specified index. 1571 Expr *getExpr(unsigned Index) const { 1572 assert((Index < NumExprs) && "Arg access out of range!"); 1573 return cast<Expr>(SubExprs[Index]); 1574 } 1575 1576 /// getFn - Return the matching candidate function for this OverloadExpr. 1577 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1578 1579 virtual SourceRange getSourceRange() const { 1580 return SourceRange(BuiltinLoc, RParenLoc); 1581 } 1582 static bool classof(const Stmt *T) { 1583 return T->getStmtClass() == OverloadExprClass; 1584 } 1585 static bool classof(const OverloadExpr *) { return true; } 1586 1587 // Iterators 1588 virtual child_iterator child_begin(); 1589 virtual child_iterator child_end(); 1590 1591 virtual void EmitImpl(llvm::Serializer& S) const; 1592 static OverloadExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1593}; 1594 1595/// VAArgExpr, used for the builtin function __builtin_va_start. 1596class VAArgExpr : public Expr { 1597 Stmt *Val; 1598 SourceLocation BuiltinLoc, RParenLoc; 1599public: 1600 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1601 : Expr(VAArgExprClass, t), 1602 Val(e), 1603 BuiltinLoc(BLoc), 1604 RParenLoc(RPLoc) { } 1605 1606 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1607 Expr *getSubExpr() { return cast<Expr>(Val); } 1608 virtual SourceRange getSourceRange() const { 1609 return SourceRange(BuiltinLoc, RParenLoc); 1610 } 1611 static bool classof(const Stmt *T) { 1612 return T->getStmtClass() == VAArgExprClass; 1613 } 1614 static bool classof(const VAArgExpr *) { return true; } 1615 1616 // Iterators 1617 virtual child_iterator child_begin(); 1618 virtual child_iterator child_end(); 1619 1620 virtual void EmitImpl(llvm::Serializer& S) const; 1621 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1622}; 1623 1624/// @brief Describes an C or C++ initializer list. 1625/// 1626/// InitListExpr describes an initializer list, which can be used to 1627/// initialize objects of different types, including 1628/// struct/class/union types, arrays, and vectors. For example: 1629/// 1630/// @code 1631/// struct foo x = { 1, { 2, 3 } }; 1632/// @endcode 1633/// 1634/// Prior to semantic analysis, an initializer list will represent the 1635/// initializer list as written by the user, but will have the 1636/// placeholder type "void". This initializer list is called the 1637/// syntactic form of the initializer, and may contain C99 designated 1638/// initializers (represented as DesignatedInitExprs), initializations 1639/// of subobject members without explicit braces, and so on. Clients 1640/// interested in the original syntax of the initializer list should 1641/// use the syntactic form of the initializer list. 1642/// 1643/// After semantic analysis, the initializer list will represent the 1644/// semantic form of the initializer, where the initializations of all 1645/// subobjects are made explicit with nested InitListExpr nodes and 1646/// C99 designators have been eliminated by placing the designated 1647/// initializations into the subobject they initialize. Additionally, 1648/// any "holes" in the initialization, where no initializer has been 1649/// specified for a particular subobject, will be replaced with 1650/// implicitly-generated ImplicitValueInitExpr expressions that 1651/// value-initialize the subobjects. Note, however, that the 1652/// initializer lists may still have fewer initializers than there are 1653/// elements to initialize within the object. 1654/// 1655/// Given the semantic form of the initializer list, one can retrieve 1656/// the original syntactic form of that initializer list (if it 1657/// exists) using getSyntacticForm(). Since many initializer lists 1658/// have the same syntactic and semantic forms, getSyntacticForm() may 1659/// return NULL, indicating that the current initializer list also 1660/// serves as its syntactic form. 1661class InitListExpr : public Expr { 1662 std::vector<Stmt *> InitExprs; 1663 SourceLocation LBraceLoc, RBraceLoc; 1664 1665 /// Contains the initializer list that describes the syntactic form 1666 /// written in the source code. 1667 InitListExpr *SyntacticForm; 1668 1669 /// If this initializer list initializes a union, specifies which 1670 /// field within the union will be initialized. 1671 FieldDecl *UnionFieldInit; 1672 1673 /// Whether this initializer list originally had a GNU array-range 1674 /// designator in it. This is a temporary marker used by CodeGen. 1675 bool HadArrayRangeDesignator; 1676 1677public: 1678 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1679 SourceLocation rbraceloc); 1680 1681 unsigned getNumInits() const { return InitExprs.size(); } 1682 1683 const Expr* getInit(unsigned Init) const { 1684 assert(Init < getNumInits() && "Initializer access out of range!"); 1685 return cast_or_null<Expr>(InitExprs[Init]); 1686 } 1687 1688 Expr* getInit(unsigned Init) { 1689 assert(Init < getNumInits() && "Initializer access out of range!"); 1690 return cast_or_null<Expr>(InitExprs[Init]); 1691 } 1692 1693 void setInit(unsigned Init, Expr *expr) { 1694 assert(Init < getNumInits() && "Initializer access out of range!"); 1695 InitExprs[Init] = expr; 1696 } 1697 1698 /// @brief Specify the number of initializers 1699 /// 1700 /// If there are more than @p NumInits initializers, the remaining 1701 /// initializers will be destroyed. If there are fewer than @p 1702 /// NumInits initializers, NULL expressions will be added for the 1703 /// unknown initializers. 1704 void resizeInits(ASTContext &Context, unsigned NumInits); 1705 1706 /// @brief Updates the initializer at index @p Init with the new 1707 /// expression @p expr, and returns the old expression at that 1708 /// location. 1709 /// 1710 /// When @p Init is out of range for this initializer list, the 1711 /// initializer list will be extended with NULL expressions to 1712 /// accomodate the new entry. 1713 Expr *updateInit(unsigned Init, Expr *expr); 1714 1715 /// \brief If this initializes a union, specifies which field in the 1716 /// union to initialize. 1717 /// 1718 /// Typically, this field is the first named field within the 1719 /// union. However, a designated initializer can specify the 1720 /// initialization of a different field within the union. 1721 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1722 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1723 1724 // Explicit InitListExpr's originate from source code (and have valid source 1725 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1726 bool isExplicit() { 1727 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1728 } 1729 1730 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1731 1732 /// @brief Retrieve the initializer list that describes the 1733 /// syntactic form of the initializer. 1734 /// 1735 /// 1736 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1737 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1738 1739 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1740 void sawArrayRangeDesignator() { 1741 HadArrayRangeDesignator = true; 1742 } 1743 1744 virtual SourceRange getSourceRange() const { 1745 return SourceRange(LBraceLoc, RBraceLoc); 1746 } 1747 static bool classof(const Stmt *T) { 1748 return T->getStmtClass() == InitListExprClass; 1749 } 1750 static bool classof(const InitListExpr *) { return true; } 1751 1752 // Iterators 1753 virtual child_iterator child_begin(); 1754 virtual child_iterator child_end(); 1755 1756 typedef std::vector<Stmt *>::iterator iterator; 1757 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1758 1759 iterator begin() { return InitExprs.begin(); } 1760 iterator end() { return InitExprs.end(); } 1761 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1762 reverse_iterator rend() { return InitExprs.rend(); } 1763 1764 // Serailization. 1765 virtual void EmitImpl(llvm::Serializer& S) const; 1766 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1767 1768private: 1769 // Used by serializer. 1770 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1771}; 1772 1773/// @brief Represents a C99 designated initializer expression. 1774/// 1775/// A designated initializer expression (C99 6.7.8) contains one or 1776/// more designators (which can be field designators, array 1777/// designators, or GNU array-range designators) followed by an 1778/// expression that initializes the field or element(s) that the 1779/// designators refer to. For example, given: 1780/// 1781/// @code 1782/// struct point { 1783/// double x; 1784/// double y; 1785/// }; 1786/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1787/// @endcode 1788/// 1789/// The InitListExpr contains three DesignatedInitExprs, the first of 1790/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1791/// designators, one array designator for @c [2] followed by one field 1792/// designator for @c .y. The initalization expression will be 1.0. 1793class DesignatedInitExpr : public Expr { 1794 /// The location of the '=' or ':' prior to the actual initializer 1795 /// expression. 1796 SourceLocation EqualOrColonLoc; 1797 1798 /// Whether this designated initializer used the GNU deprecated ':' 1799 /// syntax rather than the C99 '=' syntax. 1800 bool UsesColonSyntax : 1; 1801 1802 /// The number of designators in this initializer expression. 1803 unsigned NumDesignators : 15; 1804 1805 /// The number of subexpressions of this initializer expression, 1806 /// which contains both the initializer and any additional 1807 /// expressions used by array and array-range designators. 1808 unsigned NumSubExprs : 16; 1809 1810 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1811 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1812 unsigned NumSubExprs) 1813 : Expr(DesignatedInitExprClass, Ty), 1814 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1815 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1816 1817public: 1818 /// A field designator, e.g., ".x". 1819 struct FieldDesignator { 1820 /// Refers to the field that is being initialized. The low bit 1821 /// of this field determines whether this is actually a pointer 1822 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1823 /// initially constructed, a field designator will store an 1824 /// IdentifierInfo*. After semantic analysis has resolved that 1825 /// name, the field designator will instead store a FieldDecl*. 1826 uintptr_t NameOrField; 1827 1828 /// The location of the '.' in the designated initializer. 1829 unsigned DotLoc; 1830 1831 /// The location of the field name in the designated initializer. 1832 unsigned FieldLoc; 1833 }; 1834 1835 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1836 struct ArrayOrRangeDesignator { 1837 /// Location of the first index expression within the designated 1838 /// initializer expression's list of subexpressions. 1839 unsigned Index; 1840 /// The location of the '[' starting the array range designator. 1841 unsigned LBracketLoc; 1842 /// The location of the ellipsis separating the start and end 1843 /// indices. Only valid for GNU array-range designators. 1844 unsigned EllipsisLoc; 1845 /// The location of the ']' terminating the array range designator. 1846 unsigned RBracketLoc; 1847 }; 1848 1849 /// @brief Represents a single C99 designator. 1850 /// 1851 /// @todo This class is infuriatingly similar to clang::Designator, 1852 /// but minor differences (storing indices vs. storing pointers) 1853 /// keep us from reusing it. Try harder, later, to rectify these 1854 /// differences. 1855 class Designator { 1856 /// @brief The kind of designator this describes. 1857 enum { 1858 FieldDesignator, 1859 ArrayDesignator, 1860 ArrayRangeDesignator 1861 } Kind; 1862 1863 union { 1864 /// A field designator, e.g., ".x". 1865 struct FieldDesignator Field; 1866 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1867 struct ArrayOrRangeDesignator ArrayOrRange; 1868 }; 1869 friend class DesignatedInitExpr; 1870 1871 public: 1872 /// @brief Initializes a field designator. 1873 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1874 SourceLocation FieldLoc) 1875 : Kind(FieldDesignator) { 1876 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1877 Field.DotLoc = DotLoc.getRawEncoding(); 1878 Field.FieldLoc = FieldLoc.getRawEncoding(); 1879 } 1880 1881 /// @brief Initializes an array designator. 1882 Designator(unsigned Index, SourceLocation LBracketLoc, 1883 SourceLocation RBracketLoc) 1884 : Kind(ArrayDesignator) { 1885 ArrayOrRange.Index = Index; 1886 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1887 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1888 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1889 } 1890 1891 /// @brief Initializes a GNU array-range designator. 1892 Designator(unsigned Index, SourceLocation LBracketLoc, 1893 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1894 : Kind(ArrayRangeDesignator) { 1895 ArrayOrRange.Index = Index; 1896 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1897 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1898 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1899 } 1900 1901 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1902 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1903 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1904 1905 IdentifierInfo * getFieldName(); 1906 1907 FieldDecl *getField() { 1908 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1909 if (Field.NameOrField & 0x01) 1910 return 0; 1911 else 1912 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1913 } 1914 1915 void setField(FieldDecl *FD) { 1916 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1917 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1918 } 1919 1920 SourceLocation getDotLoc() const { 1921 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1922 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1923 } 1924 1925 SourceLocation getFieldLoc() const { 1926 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1927 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1928 } 1929 1930 SourceLocation getLBracketLoc() const { 1931 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1932 "Only valid on an array or array-range designator"); 1933 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1934 } 1935 1936 SourceLocation getRBracketLoc() const { 1937 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1938 "Only valid on an array or array-range designator"); 1939 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1940 } 1941 1942 SourceLocation getEllipsisLoc() const { 1943 assert(Kind == ArrayRangeDesignator && 1944 "Only valid on an array-range designator"); 1945 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 1946 } 1947 1948 SourceLocation getStartLocation() const { 1949 if (Kind == FieldDesignator) 1950 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 1951 else 1952 return getLBracketLoc(); 1953 } 1954 }; 1955 1956 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 1957 unsigned NumDesignators, 1958 Expr **IndexExprs, unsigned NumIndexExprs, 1959 SourceLocation EqualOrColonLoc, 1960 bool UsesColonSyntax, Expr *Init); 1961 1962 /// @brief Returns the number of designators in this initializer. 1963 unsigned size() const { return NumDesignators; } 1964 1965 // Iterator access to the designators. 1966 typedef Designator* designators_iterator; 1967 designators_iterator designators_begin(); 1968 designators_iterator designators_end(); 1969 1970 Expr *getArrayIndex(const Designator& D); 1971 Expr *getArrayRangeStart(const Designator& D); 1972 Expr *getArrayRangeEnd(const Designator& D); 1973 1974 /// @brief Retrieve the location of the '=' that precedes the 1975 /// initializer value itself, if present. 1976 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 1977 1978 /// @brief Determines whether this designated initializer used the 1979 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 1980 bool usesColonSyntax() const { return UsesColonSyntax; } 1981 1982 /// @brief Retrieve the initializer value. 1983 Expr *getInit() const { 1984 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 1985 } 1986 1987 void setInit(Expr *init) { 1988 *child_begin() = init; 1989 } 1990 1991 virtual SourceRange getSourceRange() const; 1992 1993 static bool classof(const Stmt *T) { 1994 return T->getStmtClass() == DesignatedInitExprClass; 1995 } 1996 static bool classof(const DesignatedInitExpr *) { return true; } 1997 1998 // Iterators 1999 virtual child_iterator child_begin(); 2000 virtual child_iterator child_end(); 2001}; 2002 2003/// \brief Represents an implicitly-generated value initialization of 2004/// an object of a given type. 2005/// 2006/// Implicit value initializations occur within semantic initialize 2007/// list expressions (\see InitListExpr) as placeholders for subobject 2008/// initializations not explicitly specified by the user. 2009class ImplicitValueInitExpr : public Expr { 2010public: 2011 explicit ImplicitValueInitExpr(QualType ty) 2012 : Expr(ImplicitValueInitExprClass, ty) { } 2013 2014 static bool classof(const Stmt *T) { 2015 return T->getStmtClass() == ImplicitValueInitExprClass; 2016 } 2017 static bool classof(const ImplicitValueInitExpr *) { return true; } 2018 2019 virtual SourceRange getSourceRange() const { 2020 return SourceRange(); 2021 } 2022 2023 // Iterators 2024 virtual child_iterator child_begin(); 2025 virtual child_iterator child_end(); 2026}; 2027 2028//===----------------------------------------------------------------------===// 2029// Clang Extensions 2030//===----------------------------------------------------------------------===// 2031 2032 2033/// ExtVectorElementExpr - This represents access to specific elements of a 2034/// vector, and may occur on the left hand side or right hand side. For example 2035/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2036/// 2037class ExtVectorElementExpr : public Expr { 2038 Stmt *Base; 2039 IdentifierInfo &Accessor; 2040 SourceLocation AccessorLoc; 2041public: 2042 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2043 SourceLocation loc) 2044 : Expr(ExtVectorElementExprClass, ty), 2045 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2046 2047 const Expr *getBase() const { return cast<Expr>(Base); } 2048 Expr *getBase() { return cast<Expr>(Base); } 2049 2050 IdentifierInfo &getAccessor() const { return Accessor; } 2051 2052 /// getNumElements - Get the number of components being selected. 2053 unsigned getNumElements() const; 2054 2055 /// containsDuplicateElements - Return true if any element access is 2056 /// repeated. 2057 bool containsDuplicateElements() const; 2058 2059 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2060 /// aggregate Constant of ConstantInt(s). 2061 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2062 2063 virtual SourceRange getSourceRange() const { 2064 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2065 } 2066 2067 static bool classof(const Stmt *T) { 2068 return T->getStmtClass() == ExtVectorElementExprClass; 2069 } 2070 static bool classof(const ExtVectorElementExpr *) { return true; } 2071 2072 // Iterators 2073 virtual child_iterator child_begin(); 2074 virtual child_iterator child_end(); 2075 2076 virtual void EmitImpl(llvm::Serializer& S) const; 2077 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2078}; 2079 2080 2081/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2082/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2083class BlockExpr : public Expr { 2084protected: 2085 BlockDecl *TheBlock; 2086public: 2087 BlockExpr(BlockDecl *BD, QualType ty) : Expr(BlockExprClass, ty), 2088 TheBlock(BD) {} 2089 2090 BlockDecl *getBlockDecl() { return TheBlock; } 2091 2092 // Convenience functions for probing the underlying BlockDecl. 2093 SourceLocation getCaretLocation() const; 2094 const Stmt *getBody() const; 2095 Stmt *getBody(); 2096 2097 virtual SourceRange getSourceRange() const { 2098 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2099 } 2100 2101 /// getFunctionType - Return the underlying function type for this block. 2102 const FunctionType *getFunctionType() const; 2103 2104 static bool classof(const Stmt *T) { 2105 return T->getStmtClass() == BlockExprClass; 2106 } 2107 static bool classof(const BlockExpr *) { return true; } 2108 2109 // Iterators 2110 virtual child_iterator child_begin(); 2111 virtual child_iterator child_end(); 2112 2113 virtual void EmitImpl(llvm::Serializer& S) const; 2114 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2115}; 2116 2117/// BlockDeclRefExpr - A reference to a declared variable, function, 2118/// enum, etc. 2119class BlockDeclRefExpr : public Expr { 2120 ValueDecl *D; 2121 SourceLocation Loc; 2122 bool IsByRef; 2123public: 2124 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2125 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2126 2127 ValueDecl *getDecl() { return D; } 2128 const ValueDecl *getDecl() const { return D; } 2129 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2130 2131 bool isByRef() const { return IsByRef; } 2132 2133 static bool classof(const Stmt *T) { 2134 return T->getStmtClass() == BlockDeclRefExprClass; 2135 } 2136 static bool classof(const BlockDeclRefExpr *) { return true; } 2137 2138 // Iterators 2139 virtual child_iterator child_begin(); 2140 virtual child_iterator child_end(); 2141 2142 virtual void EmitImpl(llvm::Serializer& S) const; 2143 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2144}; 2145 2146} // end namespace clang 2147 2148#endif 2149