Expr.h revision c4a09c189981b4561428e4b56fd250718e2717bb
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66public: 67 QualType getType() const { return TR; } 68 void setType(QualType t) { 69 // In C++, the type of an expression is always adjusted so that it 70 // will not have reference type an expression will never have 71 // reference type (C++ [expr]p6). Use 72 // QualType::getNonReferenceType() to retrieve the non-reference 73 // type. Additionally, inspect Expr::isLvalue to determine whether 74 // an expression that is adjusted in this manner should be 75 // considered an lvalue. 76 assert((TR.isNull() || !TR->isReferenceType()) && 77 "Expressions can't have reference type"); 78 79 TR = t; 80 } 81 82 /// isValueDependent - Determines whether this expression is 83 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 84 /// array bound of "Chars" in the following example is 85 /// value-dependent. 86 /// @code 87 /// template<int Size, char (&Chars)[Size]> struct meta_string; 88 /// @endcode 89 bool isValueDependent() const { return ValueDependent; } 90 91 /// isTypeDependent - Determines whether this expression is 92 /// type-dependent (C++ [temp.dep.expr]), which means that its type 93 /// could change from one template instantiation to the next. For 94 /// example, the expressions "x" and "x + y" are type-dependent in 95 /// the following code, but "y" is not type-dependent: 96 /// @code 97 /// template<typename T> 98 /// void add(T x, int y) { 99 /// x + y; 100 /// } 101 /// @endcode 102 bool isTypeDependent() const { return TypeDependent; } 103 104 /// SourceLocation tokens are not useful in isolation - they are low level 105 /// value objects created/interpreted by SourceManager. We assume AST 106 /// clients will have a pointer to the respective SourceManager. 107 virtual SourceRange getSourceRange() const = 0; 108 109 /// getExprLoc - Return the preferred location for the arrow when diagnosing 110 /// a problem with a generic expression. 111 virtual SourceLocation getExprLoc() const { return getLocStart(); } 112 113 /// isUnusedResultAWarning - Return true if this immediate expression should 114 /// be warned about if the result is unused. If so, fill in Loc and Ranges 115 /// with location to warn on and the source range[s] to report with the 116 /// warning. 117 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 118 SourceRange &R2) const; 119 120 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 121 /// incomplete type other than void. Nonarray expressions that can be lvalues: 122 /// - name, where name must be a variable 123 /// - e[i] 124 /// - (e), where e must be an lvalue 125 /// - e.name, where e must be an lvalue 126 /// - e->name 127 /// - *e, the type of e cannot be a function type 128 /// - string-constant 129 /// - reference type [C++ [expr]] 130 /// 131 enum isLvalueResult { 132 LV_Valid, 133 LV_NotObjectType, 134 LV_IncompleteVoidType, 135 LV_DuplicateVectorComponents, 136 LV_InvalidExpression, 137 LV_MemberFunction 138 }; 139 isLvalueResult isLvalue(ASTContext &Ctx) const; 140 141 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 142 /// does not have an incomplete type, does not have a const-qualified type, 143 /// and if it is a structure or union, does not have any member (including, 144 /// recursively, any member or element of all contained aggregates or unions) 145 /// with a const-qualified type. 146 enum isModifiableLvalueResult { 147 MLV_Valid, 148 MLV_NotObjectType, 149 MLV_IncompleteVoidType, 150 MLV_DuplicateVectorComponents, 151 MLV_InvalidExpression, 152 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 153 MLV_IncompleteType, 154 MLV_ConstQualified, 155 MLV_ArrayType, 156 MLV_NotBlockQualified, 157 MLV_ReadonlyProperty, 158 MLV_NoSetterProperty, 159 MLV_MemberFunction 160 }; 161 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx) const; 162 163 bool isBitField(); 164 165 /// getIntegerConstantExprValue() - Return the value of an integer 166 /// constant expression. The expression must be a valid integer 167 /// constant expression as determined by isIntegerConstantExpr. 168 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 169 llvm::APSInt X; 170 bool success = isIntegerConstantExpr(X, Ctx); 171 success = success; 172 assert(success && "Illegal argument to getIntegerConstantExpr"); 173 return X; 174 } 175 176 /// isIntegerConstantExpr - Return true if this expression is a valid integer 177 /// constant expression, and, if so, return its value in Result. If not a 178 /// valid i-c-e, return false and fill in Loc (if specified) with the location 179 /// of the invalid expression. 180 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 181 SourceLocation *Loc = 0, 182 bool isEvaluated = true) const; 183 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 184 SourceLocation *Loc = 0, 185 bool isEvaluated = true) const; 186 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 187 llvm::APSInt X; 188 return isIntegerConstantExpr(X, Ctx, Loc); 189 } 190 /// isConstantInitializer - Returns true if this expression is a constant 191 /// initializer, which can be emitted at compile-time. 192 bool isConstantInitializer(ASTContext &Ctx) const; 193 194 /// EvalResult is a struct with detailed info about an evaluated expression. 195 struct EvalResult { 196 /// Val - This is the value the expression can be folded to. 197 APValue Val; 198 199 /// HasSideEffects - Whether the evaluated expression has side effects. 200 /// For example, (f() && 0) can be folded, but it still has side effects. 201 bool HasSideEffects; 202 203 /// Diag - If the expression is unfoldable, then Diag contains a note 204 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 205 /// position for the error, and DiagExpr is the expression that caused 206 /// the error. 207 /// If the expression is foldable, but not an integer constant expression, 208 /// Diag contains a note diagnostic that describes why it isn't an integer 209 /// constant expression. If the expression *is* an integer constant 210 /// expression, then Diag will be zero. 211 unsigned Diag; 212 const Expr *DiagExpr; 213 SourceLocation DiagLoc; 214 215 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 216 }; 217 218 /// Evaluate - Return true if this is a constant which we can fold using 219 /// any crazy technique (that has nothing to do with language standards) that 220 /// we want to. If this function returns true, it returns the folded constant 221 /// in Result. 222 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 223 224 /// isEvaluatable - Call Evaluate to see if this expression can be constant 225 /// folded, but discard the result. 226 bool isEvaluatable(ASTContext &Ctx) const; 227 228 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 229 /// must be called on an expression that constant folds to an integer. 230 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 231 232 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 233 /// integer constant expression with the value zero, or if this is one that is 234 /// cast to void*. 235 bool isNullPointerConstant(ASTContext &Ctx) const; 236 237 /// hasGlobalStorage - Return true if this expression has static storage 238 /// duration. This means that the address of this expression is a link-time 239 /// constant. 240 bool hasGlobalStorage() const; 241 242 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 243 /// write barrier. 244 bool isOBJCGCCandidate() const; 245 246 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 247 /// its subexpression. If that subexpression is also a ParenExpr, 248 /// then this method recursively returns its subexpression, and so forth. 249 /// Otherwise, the method returns the current Expr. 250 Expr* IgnoreParens(); 251 252 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 253 /// or CastExprs, returning their operand. 254 Expr *IgnoreParenCasts(); 255 256 const Expr* IgnoreParens() const { 257 return const_cast<Expr*>(this)->IgnoreParens(); 258 } 259 const Expr *IgnoreParenCasts() const { 260 return const_cast<Expr*>(this)->IgnoreParenCasts(); 261 } 262 263 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 264 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 265 266 static bool classof(const Stmt *T) { 267 return T->getStmtClass() >= firstExprConstant && 268 T->getStmtClass() <= lastExprConstant; 269 } 270 static bool classof(const Expr *) { return true; } 271 272 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 273 return cast<Expr>(Stmt::Create(D, C)); 274 } 275}; 276 277 278//===----------------------------------------------------------------------===// 279// Primary Expressions. 280//===----------------------------------------------------------------------===// 281 282/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 283/// enum, etc. 284class DeclRefExpr : public Expr { 285 NamedDecl *D; 286 SourceLocation Loc; 287 288protected: 289 // FIXME: Eventually, this constructor will go away and all subclasses 290 // will have to provide the type- and value-dependent flags. 291 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 292 Expr(SC, t), D(d), Loc(l) {} 293 294 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 295 bool VD) : 296 Expr(SC, t, TD, VD), D(d), Loc(l) {} 297 298public: 299 // FIXME: Eventually, this constructor will go away and all clients 300 // will have to provide the type- and value-dependent flags. 301 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 302 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 303 304 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 305 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 306 307 NamedDecl *getDecl() { return D; } 308 const NamedDecl *getDecl() const { return D; } 309 void setDecl(NamedDecl *NewD) { D = NewD; } 310 311 SourceLocation getLocation() const { return Loc; } 312 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 313 314 static bool classof(const Stmt *T) { 315 return T->getStmtClass() == DeclRefExprClass || 316 T->getStmtClass() == CXXConditionDeclExprClass || 317 T->getStmtClass() == QualifiedDeclRefExprClass; 318 } 319 static bool classof(const DeclRefExpr *) { return true; } 320 321 // Iterators 322 virtual child_iterator child_begin(); 323 virtual child_iterator child_end(); 324 325 virtual void EmitImpl(llvm::Serializer& S) const; 326 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 327}; 328 329/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 330class PredefinedExpr : public Expr { 331public: 332 enum IdentType { 333 Func, 334 Function, 335 PrettyFunction 336 }; 337 338private: 339 SourceLocation Loc; 340 IdentType Type; 341public: 342 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 343 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 344 345 IdentType getIdentType() const { return Type; } 346 347 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 348 349 static bool classof(const Stmt *T) { 350 return T->getStmtClass() == PredefinedExprClass; 351 } 352 static bool classof(const PredefinedExpr *) { return true; } 353 354 // Iterators 355 virtual child_iterator child_begin(); 356 virtual child_iterator child_end(); 357 358 virtual void EmitImpl(llvm::Serializer& S) const; 359 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 360}; 361 362class IntegerLiteral : public Expr { 363 llvm::APInt Value; 364 SourceLocation Loc; 365public: 366 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 367 // or UnsignedLongLongTy 368 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 369 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 370 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 371 } 372 const llvm::APInt &getValue() const { return Value; } 373 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 374 375 static bool classof(const Stmt *T) { 376 return T->getStmtClass() == IntegerLiteralClass; 377 } 378 static bool classof(const IntegerLiteral *) { return true; } 379 380 // Iterators 381 virtual child_iterator child_begin(); 382 virtual child_iterator child_end(); 383 384 virtual void EmitImpl(llvm::Serializer& S) const; 385 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 386}; 387 388class CharacterLiteral : public Expr { 389 unsigned Value; 390 SourceLocation Loc; 391 bool IsWide; 392public: 393 // type should be IntTy 394 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 395 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 396 } 397 SourceLocation getLoc() const { return Loc; } 398 bool isWide() const { return IsWide; } 399 400 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 401 402 unsigned getValue() const { return Value; } 403 404 static bool classof(const Stmt *T) { 405 return T->getStmtClass() == CharacterLiteralClass; 406 } 407 static bool classof(const CharacterLiteral *) { return true; } 408 409 // Iterators 410 virtual child_iterator child_begin(); 411 virtual child_iterator child_end(); 412 413 virtual void EmitImpl(llvm::Serializer& S) const; 414 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 415}; 416 417class FloatingLiteral : public Expr { 418 llvm::APFloat Value; 419 bool IsExact : 1; 420 SourceLocation Loc; 421public: 422 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 423 QualType Type, SourceLocation L) 424 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 425 426 const llvm::APFloat &getValue() const { return Value; } 427 428 bool isExact() const { return IsExact; } 429 430 /// getValueAsApproximateDouble - This returns the value as an inaccurate 431 /// double. Note that this may cause loss of precision, but is useful for 432 /// debugging dumps, etc. 433 double getValueAsApproximateDouble() const; 434 435 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 436 437 static bool classof(const Stmt *T) { 438 return T->getStmtClass() == FloatingLiteralClass; 439 } 440 static bool classof(const FloatingLiteral *) { return true; } 441 442 // Iterators 443 virtual child_iterator child_begin(); 444 virtual child_iterator child_end(); 445 446 virtual void EmitImpl(llvm::Serializer& S) const; 447 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 448}; 449 450/// ImaginaryLiteral - We support imaginary integer and floating point literals, 451/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 452/// IntegerLiteral classes. Instances of this class always have a Complex type 453/// whose element type matches the subexpression. 454/// 455class ImaginaryLiteral : public Expr { 456 Stmt *Val; 457public: 458 ImaginaryLiteral(Expr *val, QualType Ty) 459 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 460 461 const Expr *getSubExpr() const { return cast<Expr>(Val); } 462 Expr *getSubExpr() { return cast<Expr>(Val); } 463 464 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 465 static bool classof(const Stmt *T) { 466 return T->getStmtClass() == ImaginaryLiteralClass; 467 } 468 static bool classof(const ImaginaryLiteral *) { return true; } 469 470 // Iterators 471 virtual child_iterator child_begin(); 472 virtual child_iterator child_end(); 473 474 virtual void EmitImpl(llvm::Serializer& S) const; 475 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 476}; 477 478/// StringLiteral - This represents a string literal expression, e.g. "foo" 479/// or L"bar" (wide strings). The actual string is returned by getStrData() 480/// is NOT null-terminated, and the length of the string is determined by 481/// calling getByteLength(). The C type for a string is always a 482/// ConstantArrayType. In C++, the char type is const qualified, in C it is 483/// not. 484/// 485/// Note that strings in C can be formed by concatenation of multiple string 486/// literal pptokens in translation phase #6. This keeps track of the locations 487/// of each of these pieces. 488/// 489/// Strings in C can also be truncated and extended by assigning into arrays, 490/// e.g. with constructs like: 491/// char X[2] = "foobar"; 492/// In this case, getByteLength() will return 6, but the string literal will 493/// have type "char[2]". 494class StringLiteral : public Expr { 495 const char *StrData; 496 unsigned ByteLength; 497 bool IsWide; 498 unsigned NumConcatenated; 499 SourceLocation TokLocs[1]; 500 501 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 502public: 503 /// This is the "fully general" constructor that allows representation of 504 /// strings formed from multiple concatenated tokens. 505 static StringLiteral *Create(ASTContext &C, const char *StrData, 506 unsigned ByteLength, bool Wide, QualType Ty, 507 SourceLocation *Loc, unsigned NumStrs); 508 509 /// Simple constructor for string literals made from one token. 510 static StringLiteral *Create(ASTContext &C, const char *StrData, 511 unsigned ByteLength, 512 bool Wide, QualType Ty, SourceLocation Loc) { 513 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 514 } 515 516 void Destroy(ASTContext &C); 517 518 const char *getStrData() const { return StrData; } 519 unsigned getByteLength() const { return ByteLength; } 520 bool isWide() const { return IsWide; } 521 522 /// getNumConcatenated - Get the number of string literal tokens that were 523 /// concatenated in translation phase #6 to form this string literal. 524 unsigned getNumConcatenated() const { return NumConcatenated; } 525 526 SourceLocation getStrTokenLoc(unsigned TokNum) const { 527 assert(TokNum < NumConcatenated && "Invalid tok number"); 528 return TokLocs[TokNum]; 529 } 530 531 typedef const SourceLocation *tokloc_iterator; 532 tokloc_iterator tokloc_begin() const { return TokLocs; } 533 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 534 535 virtual SourceRange getSourceRange() const { 536 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 537 } 538 static bool classof(const Stmt *T) { 539 return T->getStmtClass() == StringLiteralClass; 540 } 541 static bool classof(const StringLiteral *) { return true; } 542 543 // Iterators 544 virtual child_iterator child_begin(); 545 virtual child_iterator child_end(); 546 547 virtual void EmitImpl(llvm::Serializer& S) const; 548 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 549}; 550 551/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 552/// AST node is only formed if full location information is requested. 553class ParenExpr : public Expr { 554 SourceLocation L, R; 555 Stmt *Val; 556public: 557 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 558 : Expr(ParenExprClass, val->getType(), 559 val->isTypeDependent(), val->isValueDependent()), 560 L(l), R(r), Val(val) {} 561 562 const Expr *getSubExpr() const { return cast<Expr>(Val); } 563 Expr *getSubExpr() { return cast<Expr>(Val); } 564 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 565 566 static bool classof(const Stmt *T) { 567 return T->getStmtClass() == ParenExprClass; 568 } 569 static bool classof(const ParenExpr *) { return true; } 570 571 // Iterators 572 virtual child_iterator child_begin(); 573 virtual child_iterator child_end(); 574 575 virtual void EmitImpl(llvm::Serializer& S) const; 576 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 577}; 578 579 580/// UnaryOperator - This represents the unary-expression's (except sizeof and 581/// alignof), the postinc/postdec operators from postfix-expression, and various 582/// extensions. 583/// 584/// Notes on various nodes: 585/// 586/// Real/Imag - These return the real/imag part of a complex operand. If 587/// applied to a non-complex value, the former returns its operand and the 588/// later returns zero in the type of the operand. 589/// 590/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 591/// subexpression is a compound literal with the various MemberExpr and 592/// ArraySubscriptExpr's applied to it. 593/// 594class UnaryOperator : public Expr { 595public: 596 // Note that additions to this should also update the StmtVisitor class. 597 enum Opcode { 598 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 599 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 600 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 601 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 602 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 603 Real, Imag, // "__real expr"/"__imag expr" Extension. 604 Extension, // __extension__ marker. 605 OffsetOf // __builtin_offsetof 606 }; 607private: 608 Stmt *Val; 609 Opcode Opc; 610 SourceLocation Loc; 611public: 612 613 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 614 : Expr(UnaryOperatorClass, type, 615 input->isTypeDependent() && opc != OffsetOf, 616 input->isValueDependent()), 617 Val(input), Opc(opc), Loc(l) {} 618 619 Opcode getOpcode() const { return Opc; } 620 Expr *getSubExpr() const { return cast<Expr>(Val); } 621 622 /// getOperatorLoc - Return the location of the operator. 623 SourceLocation getOperatorLoc() const { return Loc; } 624 625 /// isPostfix - Return true if this is a postfix operation, like x++. 626 static bool isPostfix(Opcode Op) { 627 return Op == PostInc || Op == PostDec; 628 } 629 630 /// isPostfix - Return true if this is a prefix operation, like --x. 631 static bool isPrefix(Opcode Op) { 632 return Op == PreInc || Op == PreDec; 633 } 634 635 bool isPrefix() const { return isPrefix(Opc); } 636 bool isPostfix() const { return isPostfix(Opc); } 637 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 638 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 639 bool isOffsetOfOp() const { return Opc == OffsetOf; } 640 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 641 642 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 643 /// corresponds to, e.g. "sizeof" or "[pre]++" 644 static const char *getOpcodeStr(Opcode Op); 645 646 virtual SourceRange getSourceRange() const { 647 if (isPostfix()) 648 return SourceRange(Val->getLocStart(), Loc); 649 else 650 return SourceRange(Loc, Val->getLocEnd()); 651 } 652 virtual SourceLocation getExprLoc() const { return Loc; } 653 654 static bool classof(const Stmt *T) { 655 return T->getStmtClass() == UnaryOperatorClass; 656 } 657 static bool classof(const UnaryOperator *) { return true; } 658 659 int64_t evaluateOffsetOf(ASTContext& C) const; 660 661 // Iterators 662 virtual child_iterator child_begin(); 663 virtual child_iterator child_end(); 664 665 virtual void EmitImpl(llvm::Serializer& S) const; 666 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 667}; 668 669/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 670/// types and expressions. 671class SizeOfAlignOfExpr : public Expr { 672 bool isSizeof : 1; // true if sizeof, false if alignof. 673 bool isType : 1; // true if operand is a type, false if an expression 674 union { 675 void *Ty; 676 Stmt *Ex; 677 } Argument; 678 SourceLocation OpLoc, RParenLoc; 679public: 680 SizeOfAlignOfExpr(bool issizeof, bool istype, void *argument, 681 QualType resultType, SourceLocation op, 682 SourceLocation rp) : 683 Expr(SizeOfAlignOfExprClass, resultType), isSizeof(issizeof), 684 isType(istype), OpLoc(op), RParenLoc(rp) { 685 if (isType) 686 Argument.Ty = argument; 687 else 688 // argument was an Expr*, so cast it back to that to be safe 689 Argument.Ex = static_cast<Expr*>(argument); 690 } 691 692 virtual void Destroy(ASTContext& C); 693 694 bool isSizeOf() const { return isSizeof; } 695 bool isArgumentType() const { return isType; } 696 QualType getArgumentType() const { 697 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 698 return QualType::getFromOpaquePtr(Argument.Ty); 699 } 700 Expr *getArgumentExpr() { 701 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 702 return static_cast<Expr*>(Argument.Ex); 703 } 704 const Expr *getArgumentExpr() const { 705 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 706 } 707 708 /// Gets the argument type, or the type of the argument expression, whichever 709 /// is appropriate. 710 QualType getTypeOfArgument() const { 711 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 712 } 713 714 SourceLocation getOperatorLoc() const { return OpLoc; } 715 716 virtual SourceRange getSourceRange() const { 717 return SourceRange(OpLoc, RParenLoc); 718 } 719 720 static bool classof(const Stmt *T) { 721 return T->getStmtClass() == SizeOfAlignOfExprClass; 722 } 723 static bool classof(const SizeOfAlignOfExpr *) { return true; } 724 725 // Iterators 726 virtual child_iterator child_begin(); 727 virtual child_iterator child_end(); 728 729 virtual void EmitImpl(llvm::Serializer& S) const; 730 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 731}; 732 733//===----------------------------------------------------------------------===// 734// Postfix Operators. 735//===----------------------------------------------------------------------===// 736 737/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 738class ArraySubscriptExpr : public Expr { 739 enum { LHS, RHS, END_EXPR=2 }; 740 Stmt* SubExprs[END_EXPR]; 741 SourceLocation RBracketLoc; 742public: 743 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 744 SourceLocation rbracketloc) 745 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 746 SubExprs[LHS] = lhs; 747 SubExprs[RHS] = rhs; 748 } 749 750 /// An array access can be written A[4] or 4[A] (both are equivalent). 751 /// - getBase() and getIdx() always present the normalized view: A[4]. 752 /// In this case getBase() returns "A" and getIdx() returns "4". 753 /// - getLHS() and getRHS() present the syntactic view. e.g. for 754 /// 4[A] getLHS() returns "4". 755 /// Note: Because vector element access is also written A[4] we must 756 /// predicate the format conversion in getBase and getIdx only on the 757 /// the type of the RHS, as it is possible for the LHS to be a vector of 758 /// integer type 759 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 760 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 761 762 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 763 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 764 765 Expr *getBase() { 766 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 767 } 768 769 const Expr *getBase() const { 770 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 771 } 772 773 Expr *getIdx() { 774 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 775 } 776 777 const Expr *getIdx() const { 778 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 779 } 780 781 virtual SourceRange getSourceRange() const { 782 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 783 } 784 785 SourceLocation getRBracketLoc() const { return RBracketLoc; } 786 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 787 788 static bool classof(const Stmt *T) { 789 return T->getStmtClass() == ArraySubscriptExprClass; 790 } 791 static bool classof(const ArraySubscriptExpr *) { return true; } 792 793 // Iterators 794 virtual child_iterator child_begin(); 795 virtual child_iterator child_end(); 796 797 virtual void EmitImpl(llvm::Serializer& S) const; 798 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 799}; 800 801 802/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 803/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 804/// while its subclasses may represent alternative syntax that (semantically) 805/// results in a function call. For example, CXXOperatorCallExpr is 806/// a subclass for overloaded operator calls that use operator syntax, e.g., 807/// "str1 + str2" to resolve to a function call. 808class CallExpr : public Expr { 809 enum { FN=0, ARGS_START=1 }; 810 Stmt **SubExprs; 811 unsigned NumArgs; 812 SourceLocation RParenLoc; 813 814 // This version of the ctor is for deserialization. 815 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 816 SourceLocation rparenloc) 817 : Expr(SC,t), SubExprs(subexprs), 818 NumArgs(numargs), RParenLoc(rparenloc) {} 819 820protected: 821 // This version of the constructor is for derived classes. 822 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 823 QualType t, SourceLocation rparenloc); 824 825public: 826 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 827 SourceLocation rparenloc); 828 829 ~CallExpr() {} 830 831 void Destroy(ASTContext& C); 832 833 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 834 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 835 void setCallee(Expr *F) { SubExprs[FN] = F; } 836 837 /// getNumArgs - Return the number of actual arguments to this call. 838 /// 839 unsigned getNumArgs() const { return NumArgs; } 840 841 /// getArg - Return the specified argument. 842 Expr *getArg(unsigned Arg) { 843 assert(Arg < NumArgs && "Arg access out of range!"); 844 return cast<Expr>(SubExprs[Arg+ARGS_START]); 845 } 846 const Expr *getArg(unsigned Arg) const { 847 assert(Arg < NumArgs && "Arg access out of range!"); 848 return cast<Expr>(SubExprs[Arg+ARGS_START]); 849 } 850 851 // FIXME: Why is this needed? Why not just create the CallExpr with the 852 // corect number of arguments? It makes the ASTs less brittle. 853 /// setArg - Set the specified argument. 854 void setArg(unsigned Arg, Expr *ArgExpr) { 855 assert(Arg < NumArgs && "Arg access out of range!"); 856 SubExprs[Arg+ARGS_START] = ArgExpr; 857 } 858 859 // FIXME: It would be great to just get rid of this. There is only one 860 // callee of this method, and it probably could be refactored to not use 861 // this method and instead just create a CallExpr with the right number of 862 // arguments. 863 /// setNumArgs - This changes the number of arguments present in this call. 864 /// Any orphaned expressions are deleted by this, and any new operands are set 865 /// to null. 866 void setNumArgs(ASTContext& C, unsigned NumArgs); 867 868 typedef ExprIterator arg_iterator; 869 typedef ConstExprIterator const_arg_iterator; 870 871 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 872 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 873 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 874 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 875 876 /// getNumCommas - Return the number of commas that must have been present in 877 /// this function call. 878 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 879 880 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 881 /// not, return 0. 882 unsigned isBuiltinCall(ASTContext &Context) const; 883 884 SourceLocation getRParenLoc() const { return RParenLoc; } 885 886 virtual SourceRange getSourceRange() const { 887 return SourceRange(getCallee()->getLocStart(), RParenLoc); 888 } 889 890 static bool classof(const Stmt *T) { 891 return T->getStmtClass() == CallExprClass || 892 T->getStmtClass() == CXXOperatorCallExprClass || 893 T->getStmtClass() == CXXMemberCallExprClass; 894 } 895 static bool classof(const CallExpr *) { return true; } 896 static bool classof(const CXXOperatorCallExpr *) { return true; } 897 static bool classof(const CXXMemberCallExpr *) { return true; } 898 899 // Iterators 900 virtual child_iterator child_begin(); 901 virtual child_iterator child_end(); 902 903 virtual void EmitImpl(llvm::Serializer& S) const; 904 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 905 StmtClass SC); 906}; 907 908/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 909/// 910class MemberExpr : public Expr { 911 Stmt *Base; 912 NamedDecl *MemberDecl; 913 SourceLocation MemberLoc; 914 bool IsArrow; // True if this is "X->F", false if this is "X.F". 915public: 916 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 917 QualType ty) 918 : Expr(MemberExprClass, ty), 919 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 920 921 void setBase(Expr *E) { Base = E; } 922 Expr *getBase() const { return cast<Expr>(Base); } 923 NamedDecl *getMemberDecl() const { return MemberDecl; } 924 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 925 bool isArrow() const { return IsArrow; } 926 SourceLocation getMemberLoc() const { return MemberLoc; } 927 928 virtual SourceRange getSourceRange() const { 929 return SourceRange(getBase()->getLocStart(), MemberLoc); 930 } 931 932 virtual SourceLocation getExprLoc() const { return MemberLoc; } 933 934 static bool classof(const Stmt *T) { 935 return T->getStmtClass() == MemberExprClass; 936 } 937 static bool classof(const MemberExpr *) { return true; } 938 939 // Iterators 940 virtual child_iterator child_begin(); 941 virtual child_iterator child_end(); 942 943 virtual void EmitImpl(llvm::Serializer& S) const; 944 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 945}; 946 947/// CompoundLiteralExpr - [C99 6.5.2.5] 948/// 949class CompoundLiteralExpr : public Expr { 950 /// LParenLoc - If non-null, this is the location of the left paren in a 951 /// compound literal like "(int){4}". This can be null if this is a 952 /// synthesized compound expression. 953 SourceLocation LParenLoc; 954 Stmt *Init; 955 bool FileScope; 956public: 957 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 958 bool fileScope) 959 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 960 FileScope(fileScope) {} 961 962 const Expr *getInitializer() const { return cast<Expr>(Init); } 963 Expr *getInitializer() { return cast<Expr>(Init); } 964 965 bool isFileScope() const { return FileScope; } 966 967 SourceLocation getLParenLoc() const { return LParenLoc; } 968 969 virtual SourceRange getSourceRange() const { 970 // FIXME: Init should never be null. 971 if (!Init) 972 return SourceRange(); 973 if (LParenLoc.isInvalid()) 974 return Init->getSourceRange(); 975 return SourceRange(LParenLoc, Init->getLocEnd()); 976 } 977 978 static bool classof(const Stmt *T) { 979 return T->getStmtClass() == CompoundLiteralExprClass; 980 } 981 static bool classof(const CompoundLiteralExpr *) { return true; } 982 983 // Iterators 984 virtual child_iterator child_begin(); 985 virtual child_iterator child_end(); 986 987 virtual void EmitImpl(llvm::Serializer& S) const; 988 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 989}; 990 991/// CastExpr - Base class for type casts, including both implicit 992/// casts (ImplicitCastExpr) and explicit casts that have some 993/// representation in the source code (ExplicitCastExpr's derived 994/// classes). 995class CastExpr : public Expr { 996 Stmt *Op; 997protected: 998 CastExpr(StmtClass SC, QualType ty, Expr *op) : 999 Expr(SC, ty, 1000 // Cast expressions are type-dependent if the type is 1001 // dependent (C++ [temp.dep.expr]p3). 1002 ty->isDependentType(), 1003 // Cast expressions are value-dependent if the type is 1004 // dependent or if the subexpression is value-dependent. 1005 ty->isDependentType() || (op && op->isValueDependent())), 1006 Op(op) {} 1007 1008public: 1009 Expr *getSubExpr() { return cast<Expr>(Op); } 1010 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1011 1012 static bool classof(const Stmt *T) { 1013 StmtClass SC = T->getStmtClass(); 1014 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1015 return true; 1016 1017 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1018 return true; 1019 1020 return false; 1021 } 1022 static bool classof(const CastExpr *) { return true; } 1023 1024 // Iterators 1025 virtual child_iterator child_begin(); 1026 virtual child_iterator child_end(); 1027}; 1028 1029/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1030/// conversions, which have no direct representation in the original 1031/// source code. For example: converting T[]->T*, void f()->void 1032/// (*f)(), float->double, short->int, etc. 1033/// 1034/// In C, implicit casts always produce rvalues. However, in C++, an 1035/// implicit cast whose result is being bound to a reference will be 1036/// an lvalue. For example: 1037/// 1038/// @code 1039/// class Base { }; 1040/// class Derived : public Base { }; 1041/// void f(Derived d) { 1042/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1043/// } 1044/// @endcode 1045class ImplicitCastExpr : public CastExpr { 1046 /// LvalueCast - Whether this cast produces an lvalue. 1047 bool LvalueCast; 1048 1049public: 1050 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1051 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1052 1053 virtual SourceRange getSourceRange() const { 1054 return getSubExpr()->getSourceRange(); 1055 } 1056 1057 /// isLvalueCast - Whether this cast produces an lvalue. 1058 bool isLvalueCast() const { return LvalueCast; } 1059 1060 /// setLvalueCast - Set whether this cast produces an lvalue. 1061 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1062 1063 static bool classof(const Stmt *T) { 1064 return T->getStmtClass() == ImplicitCastExprClass; 1065 } 1066 static bool classof(const ImplicitCastExpr *) { return true; } 1067 1068 virtual void EmitImpl(llvm::Serializer& S) const; 1069 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1070}; 1071 1072/// ExplicitCastExpr - An explicit cast written in the source 1073/// code. 1074/// 1075/// This class is effectively an abstract class, because it provides 1076/// the basic representation of an explicitly-written cast without 1077/// specifying which kind of cast (C cast, functional cast, static 1078/// cast, etc.) was written; specific derived classes represent the 1079/// particular style of cast and its location information. 1080/// 1081/// Unlike implicit casts, explicit cast nodes have two different 1082/// types: the type that was written into the source code, and the 1083/// actual type of the expression as determined by semantic 1084/// analysis. These types may differ slightly. For example, in C++ one 1085/// can cast to a reference type, which indicates that the resulting 1086/// expression will be an lvalue. The reference type, however, will 1087/// not be used as the type of the expression. 1088class ExplicitCastExpr : public CastExpr { 1089 /// TypeAsWritten - The type that this expression is casting to, as 1090 /// written in the source code. 1091 QualType TypeAsWritten; 1092 1093protected: 1094 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1095 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1096 1097public: 1098 /// getTypeAsWritten - Returns the type that this expression is 1099 /// casting to, as written in the source code. 1100 QualType getTypeAsWritten() const { return TypeAsWritten; } 1101 1102 static bool classof(const Stmt *T) { 1103 StmtClass SC = T->getStmtClass(); 1104 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1105 return true; 1106 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1107 return true; 1108 1109 return false; 1110 } 1111 static bool classof(const ExplicitCastExpr *) { return true; } 1112}; 1113 1114/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1115/// cast in C++ (C++ [expr.cast]), which uses the syntax 1116/// (Type)expr. For example: @c (int)f. 1117class CStyleCastExpr : public ExplicitCastExpr { 1118 SourceLocation LPLoc; // the location of the left paren 1119 SourceLocation RPLoc; // the location of the right paren 1120public: 1121 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1122 SourceLocation l, SourceLocation r) : 1123 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1124 LPLoc(l), RPLoc(r) {} 1125 1126 SourceLocation getLParenLoc() const { return LPLoc; } 1127 SourceLocation getRParenLoc() const { return RPLoc; } 1128 1129 virtual SourceRange getSourceRange() const { 1130 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1131 } 1132 static bool classof(const Stmt *T) { 1133 return T->getStmtClass() == CStyleCastExprClass; 1134 } 1135 static bool classof(const CStyleCastExpr *) { return true; } 1136 1137 virtual void EmitImpl(llvm::Serializer& S) const; 1138 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1139}; 1140 1141class BinaryOperator : public Expr { 1142public: 1143 enum Opcode { 1144 // Operators listed in order of precedence. 1145 // Note that additions to this should also update the StmtVisitor class. 1146 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1147 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1148 Add, Sub, // [C99 6.5.6] Additive operators. 1149 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1150 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1151 EQ, NE, // [C99 6.5.9] Equality operators. 1152 And, // [C99 6.5.10] Bitwise AND operator. 1153 Xor, // [C99 6.5.11] Bitwise XOR operator. 1154 Or, // [C99 6.5.12] Bitwise OR operator. 1155 LAnd, // [C99 6.5.13] Logical AND operator. 1156 LOr, // [C99 6.5.14] Logical OR operator. 1157 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1158 DivAssign, RemAssign, 1159 AddAssign, SubAssign, 1160 ShlAssign, ShrAssign, 1161 AndAssign, XorAssign, 1162 OrAssign, 1163 Comma // [C99 6.5.17] Comma operator. 1164 }; 1165private: 1166 enum { LHS, RHS, END_EXPR }; 1167 Stmt* SubExprs[END_EXPR]; 1168 Opcode Opc; 1169 SourceLocation OpLoc; 1170public: 1171 1172 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1173 SourceLocation opLoc) 1174 : Expr(BinaryOperatorClass, ResTy, 1175 lhs->isTypeDependent() || rhs->isTypeDependent(), 1176 lhs->isValueDependent() || rhs->isValueDependent()), 1177 Opc(opc), OpLoc(opLoc) { 1178 SubExprs[LHS] = lhs; 1179 SubExprs[RHS] = rhs; 1180 assert(!isCompoundAssignmentOp() && 1181 "Use ArithAssignBinaryOperator for compound assignments"); 1182 } 1183 1184 SourceLocation getOperatorLoc() const { return OpLoc; } 1185 Opcode getOpcode() const { return Opc; } 1186 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1187 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1188 virtual SourceRange getSourceRange() const { 1189 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1190 } 1191 1192 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1193 /// corresponds to, e.g. "<<=". 1194 static const char *getOpcodeStr(Opcode Op); 1195 1196 /// predicates to categorize the respective opcodes. 1197 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1198 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1199 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1200 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1201 1202 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1203 bool isRelationalOp() const { return isRelationalOp(Opc); } 1204 1205 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1206 bool isEqualityOp() const { return isEqualityOp(Opc); } 1207 1208 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1209 bool isLogicalOp() const { return isLogicalOp(Opc); } 1210 1211 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1212 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1213 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1214 1215 static bool classof(const Stmt *S) { 1216 return S->getStmtClass() == BinaryOperatorClass || 1217 S->getStmtClass() == CompoundAssignOperatorClass; 1218 } 1219 static bool classof(const BinaryOperator *) { return true; } 1220 1221 // Iterators 1222 virtual child_iterator child_begin(); 1223 virtual child_iterator child_end(); 1224 1225 virtual void EmitImpl(llvm::Serializer& S) const; 1226 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1227 1228protected: 1229 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1230 SourceLocation oploc, bool dead) 1231 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1232 SubExprs[LHS] = lhs; 1233 SubExprs[RHS] = rhs; 1234 } 1235}; 1236 1237/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1238/// track of the type the operation is performed in. Due to the semantics of 1239/// these operators, the operands are promoted, the aritmetic performed, an 1240/// implicit conversion back to the result type done, then the assignment takes 1241/// place. This captures the intermediate type which the computation is done 1242/// in. 1243class CompoundAssignOperator : public BinaryOperator { 1244 QualType ComputationType; 1245public: 1246 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1247 QualType ResType, QualType CompType, 1248 SourceLocation OpLoc) 1249 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1250 ComputationType(CompType) { 1251 assert(isCompoundAssignmentOp() && 1252 "Only should be used for compound assignments"); 1253 } 1254 1255 QualType getComputationType() const { return ComputationType; } 1256 1257 static bool classof(const CompoundAssignOperator *) { return true; } 1258 static bool classof(const Stmt *S) { 1259 return S->getStmtClass() == CompoundAssignOperatorClass; 1260 } 1261 1262 virtual void EmitImpl(llvm::Serializer& S) const; 1263 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1264 ASTContext& C); 1265}; 1266 1267/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1268/// GNU "missing LHS" extension is in use. 1269/// 1270class ConditionalOperator : public Expr { 1271 enum { COND, LHS, RHS, END_EXPR }; 1272 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1273public: 1274 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1275 : Expr(ConditionalOperatorClass, t, 1276 // FIXME: the type of the conditional operator doesn't 1277 // depend on the type of the conditional, but the standard 1278 // seems to imply that it could. File a bug! 1279 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1280 (cond->isValueDependent() || 1281 (lhs && lhs->isValueDependent()) || 1282 (rhs && rhs->isValueDependent()))) { 1283 SubExprs[COND] = cond; 1284 SubExprs[LHS] = lhs; 1285 SubExprs[RHS] = rhs; 1286 } 1287 1288 // getCond - Return the expression representing the condition for 1289 // the ?: operator. 1290 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1291 1292 // getTrueExpr - Return the subexpression representing the value of the ?: 1293 // expression if the condition evaluates to true. In most cases this value 1294 // will be the same as getLHS() except a GCC extension allows the left 1295 // subexpression to be omitted, and instead of the condition be returned. 1296 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1297 // is only evaluated once. 1298 Expr *getTrueExpr() const { 1299 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1300 } 1301 1302 // getTrueExpr - Return the subexpression representing the value of the ?: 1303 // expression if the condition evaluates to false. This is the same as getRHS. 1304 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1305 1306 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1307 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1308 1309 virtual SourceRange getSourceRange() const { 1310 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1311 } 1312 static bool classof(const Stmt *T) { 1313 return T->getStmtClass() == ConditionalOperatorClass; 1314 } 1315 static bool classof(const ConditionalOperator *) { return true; } 1316 1317 // Iterators 1318 virtual child_iterator child_begin(); 1319 virtual child_iterator child_end(); 1320 1321 virtual void EmitImpl(llvm::Serializer& S) const; 1322 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1323}; 1324 1325/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1326class AddrLabelExpr : public Expr { 1327 SourceLocation AmpAmpLoc, LabelLoc; 1328 LabelStmt *Label; 1329public: 1330 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1331 QualType t) 1332 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1333 1334 virtual SourceRange getSourceRange() const { 1335 return SourceRange(AmpAmpLoc, LabelLoc); 1336 } 1337 1338 LabelStmt *getLabel() const { return Label; } 1339 1340 static bool classof(const Stmt *T) { 1341 return T->getStmtClass() == AddrLabelExprClass; 1342 } 1343 static bool classof(const AddrLabelExpr *) { return true; } 1344 1345 // Iterators 1346 virtual child_iterator child_begin(); 1347 virtual child_iterator child_end(); 1348 1349 virtual void EmitImpl(llvm::Serializer& S) const; 1350 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1351}; 1352 1353/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1354/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1355/// takes the value of the last subexpression. 1356class StmtExpr : public Expr { 1357 Stmt *SubStmt; 1358 SourceLocation LParenLoc, RParenLoc; 1359public: 1360 StmtExpr(CompoundStmt *substmt, QualType T, 1361 SourceLocation lp, SourceLocation rp) : 1362 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1363 1364 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1365 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1366 1367 virtual SourceRange getSourceRange() const { 1368 return SourceRange(LParenLoc, RParenLoc); 1369 } 1370 1371 SourceLocation getLParenLoc() const { return LParenLoc; } 1372 SourceLocation getRParenLoc() const { return RParenLoc; } 1373 1374 static bool classof(const Stmt *T) { 1375 return T->getStmtClass() == StmtExprClass; 1376 } 1377 static bool classof(const StmtExpr *) { return true; } 1378 1379 // Iterators 1380 virtual child_iterator child_begin(); 1381 virtual child_iterator child_end(); 1382 1383 virtual void EmitImpl(llvm::Serializer& S) const; 1384 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1385}; 1386 1387/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1388/// This AST node represents a function that returns 1 if two *types* (not 1389/// expressions) are compatible. The result of this built-in function can be 1390/// used in integer constant expressions. 1391class TypesCompatibleExpr : public Expr { 1392 QualType Type1; 1393 QualType Type2; 1394 SourceLocation BuiltinLoc, RParenLoc; 1395public: 1396 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1397 QualType t1, QualType t2, SourceLocation RP) : 1398 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1399 BuiltinLoc(BLoc), RParenLoc(RP) {} 1400 1401 QualType getArgType1() const { return Type1; } 1402 QualType getArgType2() const { return Type2; } 1403 1404 virtual SourceRange getSourceRange() const { 1405 return SourceRange(BuiltinLoc, RParenLoc); 1406 } 1407 static bool classof(const Stmt *T) { 1408 return T->getStmtClass() == TypesCompatibleExprClass; 1409 } 1410 static bool classof(const TypesCompatibleExpr *) { return true; } 1411 1412 // Iterators 1413 virtual child_iterator child_begin(); 1414 virtual child_iterator child_end(); 1415 1416 virtual void EmitImpl(llvm::Serializer& S) const; 1417 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1418}; 1419 1420/// ShuffleVectorExpr - clang-specific builtin-in function 1421/// __builtin_shufflevector. 1422/// This AST node represents a operator that does a constant 1423/// shuffle, similar to LLVM's shufflevector instruction. It takes 1424/// two vectors and a variable number of constant indices, 1425/// and returns the appropriately shuffled vector. 1426class ShuffleVectorExpr : public Expr { 1427 SourceLocation BuiltinLoc, RParenLoc; 1428 1429 // SubExprs - the list of values passed to the __builtin_shufflevector 1430 // function. The first two are vectors, and the rest are constant 1431 // indices. The number of values in this list is always 1432 // 2+the number of indices in the vector type. 1433 Stmt **SubExprs; 1434 unsigned NumExprs; 1435 1436public: 1437 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1438 QualType Type, SourceLocation BLoc, 1439 SourceLocation RP) : 1440 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1441 RParenLoc(RP), NumExprs(nexpr) { 1442 1443 SubExprs = new Stmt*[nexpr]; 1444 for (unsigned i = 0; i < nexpr; i++) 1445 SubExprs[i] = args[i]; 1446 } 1447 1448 virtual SourceRange getSourceRange() const { 1449 return SourceRange(BuiltinLoc, RParenLoc); 1450 } 1451 static bool classof(const Stmt *T) { 1452 return T->getStmtClass() == ShuffleVectorExprClass; 1453 } 1454 static bool classof(const ShuffleVectorExpr *) { return true; } 1455 1456 ~ShuffleVectorExpr() { 1457 delete [] SubExprs; 1458 } 1459 1460 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1461 /// constant expression, the actual arguments passed in, and the function 1462 /// pointers. 1463 unsigned getNumSubExprs() const { return NumExprs; } 1464 1465 /// getExpr - Return the Expr at the specified index. 1466 Expr *getExpr(unsigned Index) { 1467 assert((Index < NumExprs) && "Arg access out of range!"); 1468 return cast<Expr>(SubExprs[Index]); 1469 } 1470 const Expr *getExpr(unsigned Index) const { 1471 assert((Index < NumExprs) && "Arg access out of range!"); 1472 return cast<Expr>(SubExprs[Index]); 1473 } 1474 1475 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1476 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1477 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1478 } 1479 1480 // Iterators 1481 virtual child_iterator child_begin(); 1482 virtual child_iterator child_end(); 1483 1484 virtual void EmitImpl(llvm::Serializer& S) const; 1485 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1486}; 1487 1488/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1489/// This AST node is similar to the conditional operator (?:) in C, with 1490/// the following exceptions: 1491/// - the test expression must be a constant expression. 1492/// - the expression returned has it's type unaltered by promotion rules. 1493/// - does not evaluate the expression that was not chosen. 1494class ChooseExpr : public Expr { 1495 enum { COND, LHS, RHS, END_EXPR }; 1496 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1497 SourceLocation BuiltinLoc, RParenLoc; 1498public: 1499 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1500 SourceLocation RP) 1501 : Expr(ChooseExprClass, t), 1502 BuiltinLoc(BLoc), RParenLoc(RP) { 1503 SubExprs[COND] = cond; 1504 SubExprs[LHS] = lhs; 1505 SubExprs[RHS] = rhs; 1506 } 1507 1508 /// isConditionTrue - Return true if the condition is true. This is always 1509 /// statically knowable for a well-formed choosexpr. 1510 bool isConditionTrue(ASTContext &C) const; 1511 1512 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1513 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1514 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1515 1516 virtual SourceRange getSourceRange() const { 1517 return SourceRange(BuiltinLoc, RParenLoc); 1518 } 1519 static bool classof(const Stmt *T) { 1520 return T->getStmtClass() == ChooseExprClass; 1521 } 1522 static bool classof(const ChooseExpr *) { return true; } 1523 1524 // Iterators 1525 virtual child_iterator child_begin(); 1526 virtual child_iterator child_end(); 1527 1528 virtual void EmitImpl(llvm::Serializer& S) const; 1529 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1530}; 1531 1532/// GNUNullExpr - Implements the GNU __null extension, which is a name 1533/// for a null pointer constant that has integral type (e.g., int or 1534/// long) and is the same size and alignment as a pointer. The __null 1535/// extension is typically only used by system headers, which define 1536/// NULL as __null in C++ rather than using 0 (which is an integer 1537/// that may not match the size of a pointer). 1538class GNUNullExpr : public Expr { 1539 /// TokenLoc - The location of the __null keyword. 1540 SourceLocation TokenLoc; 1541 1542public: 1543 GNUNullExpr(QualType Ty, SourceLocation Loc) 1544 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1545 1546 /// getTokenLocation - The location of the __null token. 1547 SourceLocation getTokenLocation() const { return TokenLoc; } 1548 1549 virtual SourceRange getSourceRange() const { 1550 return SourceRange(TokenLoc); 1551 } 1552 static bool classof(const Stmt *T) { 1553 return T->getStmtClass() == GNUNullExprClass; 1554 } 1555 static bool classof(const GNUNullExpr *) { return true; } 1556 1557 // Iterators 1558 virtual child_iterator child_begin(); 1559 virtual child_iterator child_end(); 1560 1561 virtual void EmitImpl(llvm::Serializer& S) const; 1562 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1563}; 1564 1565/// VAArgExpr, used for the builtin function __builtin_va_start. 1566class VAArgExpr : public Expr { 1567 Stmt *Val; 1568 SourceLocation BuiltinLoc, RParenLoc; 1569public: 1570 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1571 : Expr(VAArgExprClass, t), 1572 Val(e), 1573 BuiltinLoc(BLoc), 1574 RParenLoc(RPLoc) { } 1575 1576 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1577 Expr *getSubExpr() { return cast<Expr>(Val); } 1578 virtual SourceRange getSourceRange() const { 1579 return SourceRange(BuiltinLoc, RParenLoc); 1580 } 1581 static bool classof(const Stmt *T) { 1582 return T->getStmtClass() == VAArgExprClass; 1583 } 1584 static bool classof(const VAArgExpr *) { 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 VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1592}; 1593 1594/// @brief Describes an C or C++ initializer list. 1595/// 1596/// InitListExpr describes an initializer list, which can be used to 1597/// initialize objects of different types, including 1598/// struct/class/union types, arrays, and vectors. For example: 1599/// 1600/// @code 1601/// struct foo x = { 1, { 2, 3 } }; 1602/// @endcode 1603/// 1604/// Prior to semantic analysis, an initializer list will represent the 1605/// initializer list as written by the user, but will have the 1606/// placeholder type "void". This initializer list is called the 1607/// syntactic form of the initializer, and may contain C99 designated 1608/// initializers (represented as DesignatedInitExprs), initializations 1609/// of subobject members without explicit braces, and so on. Clients 1610/// interested in the original syntax of the initializer list should 1611/// use the syntactic form of the initializer list. 1612/// 1613/// After semantic analysis, the initializer list will represent the 1614/// semantic form of the initializer, where the initializations of all 1615/// subobjects are made explicit with nested InitListExpr nodes and 1616/// C99 designators have been eliminated by placing the designated 1617/// initializations into the subobject they initialize. Additionally, 1618/// any "holes" in the initialization, where no initializer has been 1619/// specified for a particular subobject, will be replaced with 1620/// implicitly-generated ImplicitValueInitExpr expressions that 1621/// value-initialize the subobjects. Note, however, that the 1622/// initializer lists may still have fewer initializers than there are 1623/// elements to initialize within the object. 1624/// 1625/// Given the semantic form of the initializer list, one can retrieve 1626/// the original syntactic form of that initializer list (if it 1627/// exists) using getSyntacticForm(). Since many initializer lists 1628/// have the same syntactic and semantic forms, getSyntacticForm() may 1629/// return NULL, indicating that the current initializer list also 1630/// serves as its syntactic form. 1631class InitListExpr : public Expr { 1632 std::vector<Stmt *> InitExprs; 1633 SourceLocation LBraceLoc, RBraceLoc; 1634 1635 /// Contains the initializer list that describes the syntactic form 1636 /// written in the source code. 1637 InitListExpr *SyntacticForm; 1638 1639 /// If this initializer list initializes a union, specifies which 1640 /// field within the union will be initialized. 1641 FieldDecl *UnionFieldInit; 1642 1643 /// Whether this initializer list originally had a GNU array-range 1644 /// designator in it. This is a temporary marker used by CodeGen. 1645 bool HadArrayRangeDesignator; 1646 1647public: 1648 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1649 SourceLocation rbraceloc); 1650 1651 unsigned getNumInits() const { return InitExprs.size(); } 1652 1653 const Expr* getInit(unsigned Init) const { 1654 assert(Init < getNumInits() && "Initializer access out of range!"); 1655 return cast_or_null<Expr>(InitExprs[Init]); 1656 } 1657 1658 Expr* getInit(unsigned Init) { 1659 assert(Init < getNumInits() && "Initializer access out of range!"); 1660 return cast_or_null<Expr>(InitExprs[Init]); 1661 } 1662 1663 void setInit(unsigned Init, Expr *expr) { 1664 assert(Init < getNumInits() && "Initializer access out of range!"); 1665 InitExprs[Init] = expr; 1666 } 1667 1668 /// @brief Specify the number of initializers 1669 /// 1670 /// If there are more than @p NumInits initializers, the remaining 1671 /// initializers will be destroyed. If there are fewer than @p 1672 /// NumInits initializers, NULL expressions will be added for the 1673 /// unknown initializers. 1674 void resizeInits(ASTContext &Context, unsigned NumInits); 1675 1676 /// @brief Updates the initializer at index @p Init with the new 1677 /// expression @p expr, and returns the old expression at that 1678 /// location. 1679 /// 1680 /// When @p Init is out of range for this initializer list, the 1681 /// initializer list will be extended with NULL expressions to 1682 /// accomodate the new entry. 1683 Expr *updateInit(unsigned Init, Expr *expr); 1684 1685 /// \brief If this initializes a union, specifies which field in the 1686 /// union to initialize. 1687 /// 1688 /// Typically, this field is the first named field within the 1689 /// union. However, a designated initializer can specify the 1690 /// initialization of a different field within the union. 1691 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1692 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1693 1694 // Explicit InitListExpr's originate from source code (and have valid source 1695 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1696 bool isExplicit() { 1697 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1698 } 1699 1700 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1701 1702 /// @brief Retrieve the initializer list that describes the 1703 /// syntactic form of the initializer. 1704 /// 1705 /// 1706 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1707 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1708 1709 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1710 void sawArrayRangeDesignator() { 1711 HadArrayRangeDesignator = true; 1712 } 1713 1714 virtual SourceRange getSourceRange() const { 1715 return SourceRange(LBraceLoc, RBraceLoc); 1716 } 1717 static bool classof(const Stmt *T) { 1718 return T->getStmtClass() == InitListExprClass; 1719 } 1720 static bool classof(const InitListExpr *) { return true; } 1721 1722 // Iterators 1723 virtual child_iterator child_begin(); 1724 virtual child_iterator child_end(); 1725 1726 typedef std::vector<Stmt *>::iterator iterator; 1727 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1728 1729 iterator begin() { return InitExprs.begin(); } 1730 iterator end() { return InitExprs.end(); } 1731 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1732 reverse_iterator rend() { return InitExprs.rend(); } 1733 1734 // Serailization. 1735 virtual void EmitImpl(llvm::Serializer& S) const; 1736 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1737 1738private: 1739 // Used by serializer. 1740 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1741}; 1742 1743/// @brief Represents a C99 designated initializer expression. 1744/// 1745/// A designated initializer expression (C99 6.7.8) contains one or 1746/// more designators (which can be field designators, array 1747/// designators, or GNU array-range designators) followed by an 1748/// expression that initializes the field or element(s) that the 1749/// designators refer to. For example, given: 1750/// 1751/// @code 1752/// struct point { 1753/// double x; 1754/// double y; 1755/// }; 1756/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1757/// @endcode 1758/// 1759/// The InitListExpr contains three DesignatedInitExprs, the first of 1760/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1761/// designators, one array designator for @c [2] followed by one field 1762/// designator for @c .y. The initalization expression will be 1.0. 1763class DesignatedInitExpr : public Expr { 1764 /// The location of the '=' or ':' prior to the actual initializer 1765 /// expression. 1766 SourceLocation EqualOrColonLoc; 1767 1768 /// Whether this designated initializer used the GNU deprecated ':' 1769 /// syntax rather than the C99 '=' syntax. 1770 bool UsesColonSyntax : 1; 1771 1772 /// The number of designators in this initializer expression. 1773 unsigned NumDesignators : 15; 1774 1775 /// The number of subexpressions of this initializer expression, 1776 /// which contains both the initializer and any additional 1777 /// expressions used by array and array-range designators. 1778 unsigned NumSubExprs : 16; 1779 1780 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1781 SourceLocation EqualOrColonLoc, bool UsesColonSyntax, 1782 unsigned NumSubExprs) 1783 : Expr(DesignatedInitExprClass, Ty), 1784 EqualOrColonLoc(EqualOrColonLoc), UsesColonSyntax(UsesColonSyntax), 1785 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1786 1787public: 1788 /// A field designator, e.g., ".x". 1789 struct FieldDesignator { 1790 /// Refers to the field that is being initialized. The low bit 1791 /// of this field determines whether this is actually a pointer 1792 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1793 /// initially constructed, a field designator will store an 1794 /// IdentifierInfo*. After semantic analysis has resolved that 1795 /// name, the field designator will instead store a FieldDecl*. 1796 uintptr_t NameOrField; 1797 1798 /// The location of the '.' in the designated initializer. 1799 unsigned DotLoc; 1800 1801 /// The location of the field name in the designated initializer. 1802 unsigned FieldLoc; 1803 }; 1804 1805 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1806 struct ArrayOrRangeDesignator { 1807 /// Location of the first index expression within the designated 1808 /// initializer expression's list of subexpressions. 1809 unsigned Index; 1810 /// The location of the '[' starting the array range designator. 1811 unsigned LBracketLoc; 1812 /// The location of the ellipsis separating the start and end 1813 /// indices. Only valid for GNU array-range designators. 1814 unsigned EllipsisLoc; 1815 /// The location of the ']' terminating the array range designator. 1816 unsigned RBracketLoc; 1817 }; 1818 1819 /// @brief Represents a single C99 designator. 1820 /// 1821 /// @todo This class is infuriatingly similar to clang::Designator, 1822 /// but minor differences (storing indices vs. storing pointers) 1823 /// keep us from reusing it. Try harder, later, to rectify these 1824 /// differences. 1825 class Designator { 1826 /// @brief The kind of designator this describes. 1827 enum { 1828 FieldDesignator, 1829 ArrayDesignator, 1830 ArrayRangeDesignator 1831 } Kind; 1832 1833 union { 1834 /// A field designator, e.g., ".x". 1835 struct FieldDesignator Field; 1836 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1837 struct ArrayOrRangeDesignator ArrayOrRange; 1838 }; 1839 friend class DesignatedInitExpr; 1840 1841 public: 1842 /// @brief Initializes a field designator. 1843 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1844 SourceLocation FieldLoc) 1845 : Kind(FieldDesignator) { 1846 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1847 Field.DotLoc = DotLoc.getRawEncoding(); 1848 Field.FieldLoc = FieldLoc.getRawEncoding(); 1849 } 1850 1851 /// @brief Initializes an array designator. 1852 Designator(unsigned Index, SourceLocation LBracketLoc, 1853 SourceLocation RBracketLoc) 1854 : Kind(ArrayDesignator) { 1855 ArrayOrRange.Index = Index; 1856 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1857 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1858 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1859 } 1860 1861 /// @brief Initializes a GNU array-range designator. 1862 Designator(unsigned Index, SourceLocation LBracketLoc, 1863 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 1864 : Kind(ArrayRangeDesignator) { 1865 ArrayOrRange.Index = Index; 1866 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1867 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 1868 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1869 } 1870 1871 bool isFieldDesignator() const { return Kind == FieldDesignator; } 1872 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 1873 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 1874 1875 IdentifierInfo * getFieldName(); 1876 1877 FieldDecl *getField() { 1878 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1879 if (Field.NameOrField & 0x01) 1880 return 0; 1881 else 1882 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 1883 } 1884 1885 void setField(FieldDecl *FD) { 1886 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1887 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 1888 } 1889 1890 SourceLocation getDotLoc() const { 1891 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1892 return SourceLocation::getFromRawEncoding(Field.DotLoc); 1893 } 1894 1895 SourceLocation getFieldLoc() const { 1896 assert(Kind == FieldDesignator && "Only valid on a field designator"); 1897 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 1898 } 1899 1900 SourceLocation getLBracketLoc() const { 1901 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1902 "Only valid on an array or array-range designator"); 1903 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 1904 } 1905 1906 SourceLocation getRBracketLoc() const { 1907 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 1908 "Only valid on an array or array-range designator"); 1909 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 1910 } 1911 1912 SourceLocation getEllipsisLoc() const { 1913 assert(Kind == ArrayRangeDesignator && 1914 "Only valid on an array-range designator"); 1915 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 1916 } 1917 1918 SourceLocation getStartLocation() const { 1919 if (Kind == FieldDesignator) 1920 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 1921 else 1922 return getLBracketLoc(); 1923 } 1924 }; 1925 1926 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 1927 unsigned NumDesignators, 1928 Expr **IndexExprs, unsigned NumIndexExprs, 1929 SourceLocation EqualOrColonLoc, 1930 bool UsesColonSyntax, Expr *Init); 1931 1932 /// @brief Returns the number of designators in this initializer. 1933 unsigned size() const { return NumDesignators; } 1934 1935 // Iterator access to the designators. 1936 typedef Designator* designators_iterator; 1937 designators_iterator designators_begin(); 1938 designators_iterator designators_end(); 1939 1940 Expr *getArrayIndex(const Designator& D); 1941 Expr *getArrayRangeStart(const Designator& D); 1942 Expr *getArrayRangeEnd(const Designator& D); 1943 1944 /// @brief Retrieve the location of the '=' that precedes the 1945 /// initializer value itself, if present. 1946 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 1947 1948 /// @brief Determines whether this designated initializer used the 1949 /// GNU 'fieldname:' syntax or the C99 '=' syntax. 1950 bool usesColonSyntax() const { return UsesColonSyntax; } 1951 1952 /// @brief Retrieve the initializer value. 1953 Expr *getInit() const { 1954 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 1955 } 1956 1957 void setInit(Expr *init) { 1958 *child_begin() = init; 1959 } 1960 1961 virtual SourceRange getSourceRange() const; 1962 1963 static bool classof(const Stmt *T) { 1964 return T->getStmtClass() == DesignatedInitExprClass; 1965 } 1966 static bool classof(const DesignatedInitExpr *) { return true; } 1967 1968 // Iterators 1969 virtual child_iterator child_begin(); 1970 virtual child_iterator child_end(); 1971}; 1972 1973/// \brief Represents an implicitly-generated value initialization of 1974/// an object of a given type. 1975/// 1976/// Implicit value initializations occur within semantic initializer 1977/// list expressions (InitListExpr) as placeholders for subobject 1978/// initializations not explicitly specified by the user. 1979/// 1980/// \see InitListExpr 1981class ImplicitValueInitExpr : public Expr { 1982public: 1983 explicit ImplicitValueInitExpr(QualType ty) 1984 : Expr(ImplicitValueInitExprClass, ty) { } 1985 1986 static bool classof(const Stmt *T) { 1987 return T->getStmtClass() == ImplicitValueInitExprClass; 1988 } 1989 static bool classof(const ImplicitValueInitExpr *) { return true; } 1990 1991 virtual SourceRange getSourceRange() const { 1992 return SourceRange(); 1993 } 1994 1995 // Iterators 1996 virtual child_iterator child_begin(); 1997 virtual child_iterator child_end(); 1998}; 1999 2000//===----------------------------------------------------------------------===// 2001// Clang Extensions 2002//===----------------------------------------------------------------------===// 2003 2004 2005/// ExtVectorElementExpr - This represents access to specific elements of a 2006/// vector, and may occur on the left hand side or right hand side. For example 2007/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2008/// 2009/// Note that the base may have either vector or pointer to vector type, just 2010/// like a struct field reference. 2011/// 2012class ExtVectorElementExpr : public Expr { 2013 Stmt *Base; 2014 IdentifierInfo &Accessor; 2015 SourceLocation AccessorLoc; 2016public: 2017 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2018 SourceLocation loc) 2019 : Expr(ExtVectorElementExprClass, ty), 2020 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2021 2022 const Expr *getBase() const { return cast<Expr>(Base); } 2023 Expr *getBase() { return cast<Expr>(Base); } 2024 2025 IdentifierInfo &getAccessor() const { return Accessor; } 2026 2027 /// getNumElements - Get the number of components being selected. 2028 unsigned getNumElements() const; 2029 2030 /// containsDuplicateElements - Return true if any element access is 2031 /// repeated. 2032 bool containsDuplicateElements() const; 2033 2034 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2035 /// aggregate Constant of ConstantInt(s). 2036 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2037 2038 virtual SourceRange getSourceRange() const { 2039 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2040 } 2041 2042 /// isArrow - Return true if the base expression is a pointer to vector, 2043 /// return false if the base expression is a vector. 2044 bool isArrow() const; 2045 2046 static bool classof(const Stmt *T) { 2047 return T->getStmtClass() == ExtVectorElementExprClass; 2048 } 2049 static bool classof(const ExtVectorElementExpr *) { return true; } 2050 2051 // Iterators 2052 virtual child_iterator child_begin(); 2053 virtual child_iterator child_end(); 2054 2055 virtual void EmitImpl(llvm::Serializer& S) const; 2056 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2057}; 2058 2059 2060/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2061/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2062class BlockExpr : public Expr { 2063protected: 2064 BlockDecl *TheBlock; 2065 bool HasBlockDeclRefExprs; 2066public: 2067 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2068 : Expr(BlockExprClass, ty), 2069 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2070 2071 const BlockDecl *getBlockDecl() const { return TheBlock; } 2072 BlockDecl *getBlockDecl() { return TheBlock; } 2073 2074 // Convenience functions for probing the underlying BlockDecl. 2075 SourceLocation getCaretLocation() const; 2076 const Stmt *getBody() const; 2077 Stmt *getBody(); 2078 2079 virtual SourceRange getSourceRange() const { 2080 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2081 } 2082 2083 /// getFunctionType - Return the underlying function type for this block. 2084 const FunctionType *getFunctionType() const; 2085 2086 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2087 /// contained inside. 2088 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2089 2090 static bool classof(const Stmt *T) { 2091 return T->getStmtClass() == BlockExprClass; 2092 } 2093 static bool classof(const BlockExpr *) { return true; } 2094 2095 // Iterators 2096 virtual child_iterator child_begin(); 2097 virtual child_iterator child_end(); 2098 2099 virtual void EmitImpl(llvm::Serializer& S) const; 2100 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2101}; 2102 2103/// BlockDeclRefExpr - A reference to a declared variable, function, 2104/// enum, etc. 2105class BlockDeclRefExpr : public Expr { 2106 ValueDecl *D; 2107 SourceLocation Loc; 2108 bool IsByRef; 2109public: 2110 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2111 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2112 2113 ValueDecl *getDecl() { return D; } 2114 const ValueDecl *getDecl() const { return D; } 2115 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2116 2117 bool isByRef() const { return IsByRef; } 2118 2119 static bool classof(const Stmt *T) { 2120 return T->getStmtClass() == BlockDeclRefExprClass; 2121 } 2122 static bool classof(const BlockDeclRefExpr *) { return true; } 2123 2124 // Iterators 2125 virtual child_iterator child_begin(); 2126 virtual child_iterator child_end(); 2127 2128 virtual void EmitImpl(llvm::Serializer& S) const; 2129 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2130}; 2131 2132} // end namespace clang 2133 2134#endif 2135