Expr.h revision 866b5c03e3b9c01cf496ad97b85a05afc917345b
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/Stmt.h" 18#include "clang/AST/Type.h" 19#include "clang/AST/Decl.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/Basic/IdentifierTable.h" 22#include "llvm/ADT/APSInt.h" 23#include "llvm/ADT/APFloat.h" 24 25namespace clang { 26 class IdentifierInfo; 27 class Selector; 28 class Decl; 29 class ASTContext; 30 31/// Expr - This represents one expression. Note that Expr's are subclasses of 32/// Stmt. This allows an expression to be transparently used any place a Stmt 33/// is required. 34/// 35class Expr : public Stmt { 36 QualType TR; 37protected: 38 Expr(StmtClass SC, QualType T) : Stmt(SC), TR(T) {} 39public: 40 QualType getType() const { return TR; } 41 void setType(QualType t) { TR = t; } 42 43 /// SourceLocation tokens are not useful in isolation - they are low level 44 /// value objects created/interpreted by SourceManager. We assume AST 45 /// clients will have a pointer to the respective SourceManager. 46 virtual SourceRange getSourceRange() const = 0; 47 48 /// getExprLoc - Return the preferred location for the arrow when diagnosing 49 /// a problem with a generic expression. 50 virtual SourceLocation getExprLoc() const { return getLocStart(); } 51 52 /// hasLocalSideEffect - Return true if this immediate expression has side 53 /// effects, not counting any sub-expressions. 54 bool hasLocalSideEffect() const; 55 56 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 57 /// incomplete type other than void. Nonarray expressions that can be lvalues: 58 /// - name, where name must be a variable 59 /// - e[i] 60 /// - (e), where e must be an lvalue 61 /// - e.name, where e must be an lvalue 62 /// - e->name 63 /// - *e, the type of e cannot be a function type 64 /// - string-constant 65 /// - reference type [C++ [expr]] 66 /// 67 enum isLvalueResult { 68 LV_Valid, 69 LV_NotObjectType, 70 LV_IncompleteVoidType, 71 LV_DuplicateVectorComponents, 72 LV_InvalidExpression 73 }; 74 isLvalueResult isLvalue() const; 75 76 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 77 /// does not have an incomplete type, does not have a const-qualified type, 78 /// and if it is a structure or union, does not have any member (including, 79 /// recursively, any member or element of all contained aggregates or unions) 80 /// with a const-qualified type. 81 enum isModifiableLvalueResult { 82 MLV_Valid, 83 MLV_NotObjectType, 84 MLV_IncompleteVoidType, 85 MLV_DuplicateVectorComponents, 86 MLV_InvalidExpression, 87 MLV_IncompleteType, 88 MLV_ConstQualified, 89 MLV_ArrayType 90 }; 91 isModifiableLvalueResult isModifiableLvalue() const; 92 93 bool isNullPointerConstant(ASTContext &Ctx) const; 94 95 /// isIntegerConstantExpr - Return true if this expression is a valid integer 96 /// constant expression, and, if so, return its value in Result. If not a 97 /// valid i-c-e, return false and fill in Loc (if specified) with the location 98 /// of the invalid expression. 99 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 100 SourceLocation *Loc = 0, 101 bool isEvaluated = true) const; 102 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 103 llvm::APSInt X(32); 104 return isIntegerConstantExpr(X, Ctx, Loc); 105 } 106 /// isConstantExpr - Return true if this expression is a valid constant expr. 107 bool isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const; 108 109 /// hasGlobalStorage - Return true if this expression has static storage 110 /// duration. This means that the address of this expression is a link-time 111 /// constant. 112 bool hasGlobalStorage() const; 113 114 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 115 /// its subexpression. If that subexpression is also a ParenExpr, 116 /// then this method recursively returns its subexpression, and so forth. 117 /// Otherwise, the method returns the current Expr. 118 Expr* IgnoreParens(); 119 120 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 121 /// or CastExprs or ImplicitCastExprs, returning their operand. 122 Expr *IgnoreParenCasts(); 123 124 const Expr* IgnoreParens() const { 125 return const_cast<Expr*>(this)->IgnoreParens(); 126 } 127 const Expr *IgnoreParenCasts() const { 128 return const_cast<Expr*>(this)->IgnoreParenCasts(); 129 } 130 131 static bool classof(const Stmt *T) { 132 return T->getStmtClass() >= firstExprConstant && 133 T->getStmtClass() <= lastExprConstant; 134 } 135 static bool classof(const Expr *) { return true; } 136 137 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 138 return cast<Expr>(Stmt::Create(D, C)); 139 } 140}; 141 142//===----------------------------------------------------------------------===// 143// Primary Expressions. 144//===----------------------------------------------------------------------===// 145 146/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 147/// enum, etc. 148class DeclRefExpr : public Expr { 149 ValueDecl *D; 150 SourceLocation Loc; 151public: 152 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 153 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 154 155 ValueDecl *getDecl() { return D; } 156 const ValueDecl *getDecl() const { return D; } 157 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 158 159 160 static bool classof(const Stmt *T) { 161 return T->getStmtClass() == DeclRefExprClass; 162 } 163 static bool classof(const DeclRefExpr *) { return true; } 164 165 // Iterators 166 virtual child_iterator child_begin(); 167 virtual child_iterator child_end(); 168 169 virtual void EmitImpl(llvm::Serializer& S) const; 170 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 171}; 172 173/// PreDefinedExpr - [C99 6.4.2.2] - A pre-defined identifier such as __func__. 174class PreDefinedExpr : public Expr { 175public: 176 enum IdentType { 177 Func, 178 Function, 179 PrettyFunction 180 }; 181 182private: 183 SourceLocation Loc; 184 IdentType Type; 185public: 186 PreDefinedExpr(SourceLocation l, QualType type, IdentType IT) 187 : Expr(PreDefinedExprClass, type), Loc(l), Type(IT) {} 188 189 IdentType getIdentType() const { return Type; } 190 191 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 192 193 static bool classof(const Stmt *T) { 194 return T->getStmtClass() == PreDefinedExprClass; 195 } 196 static bool classof(const PreDefinedExpr *) { return true; } 197 198 // Iterators 199 virtual child_iterator child_begin(); 200 virtual child_iterator child_end(); 201 202 virtual void EmitImpl(llvm::Serializer& S) const; 203 static PreDefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 204}; 205 206class IntegerLiteral : public Expr { 207 llvm::APInt Value; 208 SourceLocation Loc; 209public: 210 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 211 // or UnsignedLongLongTy 212 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 213 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 214 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 215 } 216 const llvm::APInt &getValue() const { return Value; } 217 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 218 219 static bool classof(const Stmt *T) { 220 return T->getStmtClass() == IntegerLiteralClass; 221 } 222 static bool classof(const IntegerLiteral *) { return true; } 223 224 // Iterators 225 virtual child_iterator child_begin(); 226 virtual child_iterator child_end(); 227 228 virtual void EmitImpl(llvm::Serializer& S) const; 229 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 230}; 231 232class CharacterLiteral : public Expr { 233 unsigned Value; 234 SourceLocation Loc; 235public: 236 // type should be IntTy 237 CharacterLiteral(unsigned value, QualType type, SourceLocation l) 238 : Expr(CharacterLiteralClass, type), Value(value), Loc(l) { 239 } 240 SourceLocation getLoc() const { return Loc; } 241 242 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 243 244 unsigned getValue() const { return Value; } 245 246 static bool classof(const Stmt *T) { 247 return T->getStmtClass() == CharacterLiteralClass; 248 } 249 static bool classof(const CharacterLiteral *) { return true; } 250 251 // Iterators 252 virtual child_iterator child_begin(); 253 virtual child_iterator child_end(); 254 255 virtual void EmitImpl(llvm::Serializer& S) const; 256 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 257}; 258 259class FloatingLiteral : public Expr { 260 llvm::APFloat Value; 261 bool IsExact : 1; 262 SourceLocation Loc; 263public: 264 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 265 QualType Type, SourceLocation L) 266 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 267 268 const llvm::APFloat &getValue() const { return Value; } 269 270 bool isExact() const { return IsExact; } 271 272 /// getValueAsDouble - This returns the value as an inaccurate double. Note 273 /// that this may cause loss of precision, but is useful for debugging dumps 274 /// etc. 275 double getValueAsDouble() const { 276 // FIXME: We need something for long double here. 277 if (cast<BuiltinType>(getType())->getKind() == BuiltinType::Float) 278 return Value.convertToFloat(); 279 else 280 return Value.convertToDouble(); 281 } 282 283 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 284 285 static bool classof(const Stmt *T) { 286 return T->getStmtClass() == FloatingLiteralClass; 287 } 288 static bool classof(const FloatingLiteral *) { return true; } 289 290 // Iterators 291 virtual child_iterator child_begin(); 292 virtual child_iterator child_end(); 293 294 virtual void EmitImpl(llvm::Serializer& S) const; 295 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 296}; 297 298/// ImaginaryLiteral - We support imaginary integer and floating point literals, 299/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 300/// IntegerLiteral classes. Instances of this class always have a Complex type 301/// whose element type matches the subexpression. 302/// 303class ImaginaryLiteral : public Expr { 304 Expr *Val; 305public: 306 ImaginaryLiteral(Expr *val, QualType Ty) 307 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 308 309 const Expr *getSubExpr() const { return Val; } 310 Expr *getSubExpr() { return Val; } 311 312 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 313 static bool classof(const Stmt *T) { 314 return T->getStmtClass() == ImaginaryLiteralClass; 315 } 316 static bool classof(const ImaginaryLiteral *) { return true; } 317 318 // Iterators 319 virtual child_iterator child_begin(); 320 virtual child_iterator child_end(); 321 322 virtual void EmitImpl(llvm::Serializer& S) const; 323 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 324}; 325 326/// StringLiteral - This represents a string literal expression, e.g. "foo" 327/// or L"bar" (wide strings). The actual string is returned by getStrData() 328/// is NOT null-terminated, and the length of the string is determined by 329/// calling getByteLength(). The C type for a string is always a 330/// ConstantArrayType. 331class StringLiteral : public Expr { 332 const char *StrData; 333 unsigned ByteLength; 334 bool IsWide; 335 // if the StringLiteral was composed using token pasting, both locations 336 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 337 // FIXME: if space becomes an issue, we should create a sub-class. 338 SourceLocation firstTokLoc, lastTokLoc; 339public: 340 StringLiteral(const char *strData, unsigned byteLength, bool Wide, 341 QualType t, SourceLocation b, SourceLocation e); 342 virtual ~StringLiteral(); 343 344 const char *getStrData() const { return StrData; } 345 unsigned getByteLength() const { return ByteLength; } 346 bool isWide() const { return IsWide; } 347 348 virtual SourceRange getSourceRange() const { 349 return SourceRange(firstTokLoc,lastTokLoc); 350 } 351 static bool classof(const Stmt *T) { 352 return T->getStmtClass() == StringLiteralClass; 353 } 354 static bool classof(const StringLiteral *) { return true; } 355 356 // Iterators 357 virtual child_iterator child_begin(); 358 virtual child_iterator child_end(); 359 360 virtual void EmitImpl(llvm::Serializer& S) const; 361 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 362}; 363 364/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 365/// AST node is only formed if full location information is requested. 366class ParenExpr : public Expr { 367 SourceLocation L, R; 368 Expr *Val; 369public: 370 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 371 : Expr(ParenExprClass, val->getType()), L(l), R(r), Val(val) {} 372 373 const Expr *getSubExpr() const { return Val; } 374 Expr *getSubExpr() { return Val; } 375 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 376 377 static bool classof(const Stmt *T) { 378 return T->getStmtClass() == ParenExprClass; 379 } 380 static bool classof(const ParenExpr *) { return true; } 381 382 // Iterators 383 virtual child_iterator child_begin(); 384 virtual child_iterator child_end(); 385 386 virtual void EmitImpl(llvm::Serializer& S) const; 387 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 388}; 389 390 391/// UnaryOperator - This represents the unary-expression's (except sizeof of 392/// types), the postinc/postdec operators from postfix-expression, and various 393/// extensions. 394/// 395/// Notes on various nodes: 396/// 397/// Real/Imag - These return the real/imag part of a complex operand. If 398/// applied to a non-complex value, the former returns its operand and the 399/// later returns zero in the type of the operand. 400/// 401/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 402/// subexpression is a compound literal with the various MemberExpr and 403/// ArraySubscriptExpr's applied to it. 404/// 405class UnaryOperator : public Expr { 406public: 407 // Note that additions to this should also update the StmtVisitor class. 408 enum Opcode { 409 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 410 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 411 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 412 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 413 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 414 SizeOf, AlignOf, // [C99 6.5.3.4] Sizeof (expr, not type) operator. 415 Real, Imag, // "__real expr"/"__imag expr" Extension. 416 Extension, // __extension__ marker. 417 OffsetOf // __builtin_offsetof 418 }; 419private: 420 Expr *Val; 421 Opcode Opc; 422 SourceLocation Loc; 423public: 424 425 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 426 : Expr(UnaryOperatorClass, type), Val(input), Opc(opc), Loc(l) {} 427 428 Opcode getOpcode() const { return Opc; } 429 Expr *getSubExpr() const { return Val; } 430 431 /// getOperatorLoc - Return the location of the operator. 432 SourceLocation getOperatorLoc() const { return Loc; } 433 434 /// isPostfix - Return true if this is a postfix operation, like x++. 435 static bool isPostfix(Opcode Op); 436 437 bool isPostfix() const { return isPostfix(Opc); } 438 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 439 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 440 bool isSizeOfAlignOfOp() const { return Opc == SizeOf || Opc == AlignOf; } 441 bool isOffsetOfOp() const { return Opc == OffsetOf; } 442 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 443 444 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 445 /// corresponds to, e.g. "sizeof" or "[pre]++" 446 static const char *getOpcodeStr(Opcode Op); 447 448 virtual SourceRange getSourceRange() const { 449 if (isPostfix()) 450 return SourceRange(Val->getLocStart(), Loc); 451 else 452 return SourceRange(Loc, Val->getLocEnd()); 453 } 454 virtual SourceLocation getExprLoc() const { return Loc; } 455 456 static bool classof(const Stmt *T) { 457 return T->getStmtClass() == UnaryOperatorClass; 458 } 459 static bool classof(const UnaryOperator *) { return true; } 460 461 int64_t evaluateOffsetOf(ASTContext& C) const; 462 463 // Iterators 464 virtual child_iterator child_begin(); 465 virtual child_iterator child_end(); 466 467 virtual void EmitImpl(llvm::Serializer& S) const; 468 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 469}; 470 471/// SizeOfAlignOfTypeExpr - [C99 6.5.3.4] - This is only for sizeof/alignof of 472/// *types*. sizeof(expr) is handled by UnaryOperator. 473class SizeOfAlignOfTypeExpr : public Expr { 474 bool isSizeof; // true if sizeof, false if alignof. 475 QualType Ty; 476 SourceLocation OpLoc, RParenLoc; 477public: 478 SizeOfAlignOfTypeExpr(bool issizeof, QualType argType, QualType resultType, 479 SourceLocation op, SourceLocation rp) : 480 Expr(SizeOfAlignOfTypeExprClass, resultType), 481 isSizeof(issizeof), Ty(argType), OpLoc(op), RParenLoc(rp) {} 482 483 bool isSizeOf() const { return isSizeof; } 484 QualType getArgumentType() const { return Ty; } 485 486 SourceLocation getOperatorLoc() const { return OpLoc; } 487 488 virtual SourceRange getSourceRange() const { 489 return SourceRange(OpLoc, RParenLoc); 490 } 491 492 static bool classof(const Stmt *T) { 493 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 494 } 495 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 496 497 // Iterators 498 virtual child_iterator child_begin(); 499 virtual child_iterator child_end(); 500 501 virtual void EmitImpl(llvm::Serializer& S) const; 502 static SizeOfAlignOfTypeExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 503}; 504 505//===----------------------------------------------------------------------===// 506// Postfix Operators. 507//===----------------------------------------------------------------------===// 508 509/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 510class ArraySubscriptExpr : public Expr { 511 enum { LHS, RHS, END_EXPR=2 }; 512 Expr* SubExprs[END_EXPR]; 513 SourceLocation RBracketLoc; 514public: 515 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 516 SourceLocation rbracketloc) 517 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 518 SubExprs[LHS] = lhs; 519 SubExprs[RHS] = rhs; 520 } 521 522 /// An array access can be written A[4] or 4[A] (both are equivalent). 523 /// - getBase() and getIdx() always present the normalized view: A[4]. 524 /// In this case getBase() returns "A" and getIdx() returns "4". 525 /// - getLHS() and getRHS() present the syntactic view. e.g. for 526 /// 4[A] getLHS() returns "4". 527 /// Note: Because vector element access is also written A[4] we must 528 /// predicate the format conversion in getBase and getIdx only on the 529 /// the type of the RHS, as it is possible for the LHS to be a vector of 530 /// integer type 531 Expr *getLHS() { return SubExprs[LHS]; } 532 const Expr *getLHS() const { return SubExprs[LHS]; } 533 534 Expr *getRHS() { return SubExprs[RHS]; } 535 const Expr *getRHS() const { return SubExprs[RHS]; } 536 537 Expr *getBase() { 538 return (getRHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 539 } 540 541 const Expr *getBase() const { 542 return (getRHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 543 } 544 545 Expr *getIdx() { 546 return (getRHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 547 } 548 549 const Expr *getIdx() const { 550 return (getRHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 551 } 552 553 virtual SourceRange getSourceRange() const { 554 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 555 } 556 557 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 558 559 static bool classof(const Stmt *T) { 560 return T->getStmtClass() == ArraySubscriptExprClass; 561 } 562 static bool classof(const ArraySubscriptExpr *) { return true; } 563 564 // Iterators 565 virtual child_iterator child_begin(); 566 virtual child_iterator child_end(); 567 568 virtual void EmitImpl(llvm::Serializer& S) const; 569 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 570}; 571 572 573/// CallExpr - [C99 6.5.2.2] Function Calls. 574/// 575class CallExpr : public Expr { 576 enum { FN=0, ARGS_START=1 }; 577 Expr **SubExprs; 578 unsigned NumArgs; 579 SourceLocation RParenLoc; 580 581 // This version of the ctor is for deserialization. 582 CallExpr(Expr** subexprs, unsigned numargs, QualType t, 583 SourceLocation rparenloc) 584 : Expr(CallExprClass,t), SubExprs(subexprs), 585 NumArgs(numargs), RParenLoc(rparenloc) {} 586 587public: 588 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 589 SourceLocation rparenloc); 590 ~CallExpr() { 591 delete [] SubExprs; 592 } 593 594 const Expr *getCallee() const { return SubExprs[FN]; } 595 Expr *getCallee() { return SubExprs[FN]; } 596 void setCallee(Expr *F) { SubExprs[FN] = F; } 597 598 /// getNumArgs - Return the number of actual arguments to this call. 599 /// 600 unsigned getNumArgs() const { return NumArgs; } 601 602 /// getArg - Return the specified argument. 603 Expr *getArg(unsigned Arg) { 604 assert(Arg < NumArgs && "Arg access out of range!"); 605 return SubExprs[Arg+ARGS_START]; 606 } 607 const Expr *getArg(unsigned Arg) const { 608 assert(Arg < NumArgs && "Arg access out of range!"); 609 return SubExprs[Arg+ARGS_START]; 610 } 611 /// setArg - Set the specified argument. 612 void setArg(unsigned Arg, Expr *ArgExpr) { 613 assert(Arg < NumArgs && "Arg access out of range!"); 614 SubExprs[Arg+ARGS_START] = ArgExpr; 615 } 616 617 /// setNumArgs - This changes the number of arguments present in this call. 618 /// Any orphaned expressions are deleted by this, and any new operands are set 619 /// to null. 620 void setNumArgs(unsigned NumArgs); 621 622 typedef Expr **arg_iterator; 623 typedef Expr * const *arg_const_iterator; 624 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 625 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 626 arg_const_iterator arg_begin() const { return SubExprs+ARGS_START; } 627 arg_const_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs(); } 628 629 630 /// getNumCommas - Return the number of commas that must have been present in 631 /// this function call. 632 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 633 634 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 635 636 /// isBuiltinConstantExpr - Return true if this built-in call is constant. 637 bool isBuiltinConstantExpr() const; 638 639 SourceLocation getRParenLoc() const { return RParenLoc; } 640 641 virtual SourceRange getSourceRange() const { 642 return SourceRange(getCallee()->getLocStart(), RParenLoc); 643 } 644 645 static bool classof(const Stmt *T) { 646 return T->getStmtClass() == CallExprClass; 647 } 648 static bool classof(const CallExpr *) { return true; } 649 650 // Iterators 651 virtual child_iterator child_begin(); 652 virtual child_iterator child_end(); 653 654 virtual void EmitImpl(llvm::Serializer& S) const; 655 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 656}; 657 658/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 659/// 660class MemberExpr : public Expr { 661 Expr *Base; 662 FieldDecl *MemberDecl; 663 SourceLocation MemberLoc; 664 bool IsArrow; // True if this is "X->F", false if this is "X.F". 665public: 666 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l, 667 QualType ty) 668 : Expr(MemberExprClass, ty), 669 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 670 671 Expr *getBase() const { return Base; } 672 FieldDecl *getMemberDecl() const { return MemberDecl; } 673 bool isArrow() const { return IsArrow; } 674 675 virtual SourceRange getSourceRange() const { 676 return SourceRange(getBase()->getLocStart(), MemberLoc); 677 } 678 679 virtual SourceLocation getExprLoc() const { return MemberLoc; } 680 681 static bool classof(const Stmt *T) { 682 return T->getStmtClass() == MemberExprClass; 683 } 684 static bool classof(const MemberExpr *) { return true; } 685 686 // Iterators 687 virtual child_iterator child_begin(); 688 virtual child_iterator child_end(); 689 690 virtual void EmitImpl(llvm::Serializer& S) const; 691 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 692}; 693 694/// OCUVectorElementExpr - This represents access to specific elements of a 695/// vector, and may occur on the left hand side or right hand side. For example 696/// the following is legal: "V.xy = V.zw" if V is a 4 element ocu vector. 697/// 698class OCUVectorElementExpr : public Expr { 699 Expr *Base; 700 IdentifierInfo &Accessor; 701 SourceLocation AccessorLoc; 702public: 703 enum ElementType { 704 Point, // xywz 705 Color, // rgba 706 Texture // stpq 707 }; 708 OCUVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 709 SourceLocation loc) 710 : Expr(OCUVectorElementExprClass, ty), 711 Base(base), Accessor(accessor), AccessorLoc(loc) {} 712 713 const Expr *getBase() const { return Base; } 714 Expr *getBase() { return Base; } 715 716 IdentifierInfo &getAccessor() const { return Accessor; } 717 718 /// getNumElements - Get the number of components being selected. 719 unsigned getNumElements() const; 720 721 /// getElementType - Determine whether the components of this access are 722 /// "point" "color" or "texture" elements. 723 ElementType getElementType() const; 724 725 /// containsDuplicateElements - Return true if any element access is 726 /// repeated. 727 bool containsDuplicateElements() const; 728 729 /// getEncodedElementAccess - Encode the elements accessed into a bit vector. 730 /// The encoding currently uses 2-bit bitfields, but clients should use the 731 /// accessors below to access them. 732 /// 733 unsigned getEncodedElementAccess() const; 734 735 /// getAccessedFieldNo - Given an encoded value and a result number, return 736 /// the input field number being accessed. 737 static unsigned getAccessedFieldNo(unsigned Idx, unsigned EncodedVal) { 738 return (EncodedVal >> (Idx*2)) & 3; 739 } 740 741 virtual SourceRange getSourceRange() const { 742 return SourceRange(getBase()->getLocStart(), AccessorLoc); 743 } 744 745 static bool classof(const Stmt *T) { 746 return T->getStmtClass() == OCUVectorElementExprClass; 747 } 748 static bool classof(const OCUVectorElementExpr *) { return true; } 749 750 // Iterators 751 virtual child_iterator child_begin(); 752 virtual child_iterator child_end(); 753}; 754 755/// CompoundLiteralExpr - [C99 6.5.2.5] 756/// 757class CompoundLiteralExpr : public Expr { 758 /// LParenLoc - If non-null, this is the location of the left paren in a 759 /// compound literal like "(int){4}". This can be null if this is a 760 /// synthesized compound expression. 761 SourceLocation LParenLoc; 762 Expr *Init; 763 bool FileScope; 764public: 765 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, bool fileScope) : 766 Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), FileScope(fileScope) {} 767 768 const Expr *getInitializer() const { return Init; } 769 Expr *getInitializer() { return Init; } 770 771 bool isFileScope() const { return FileScope; } 772 773 SourceLocation getLParenLoc() const { return LParenLoc; } 774 775 virtual SourceRange getSourceRange() const { 776 // FIXME: Init should never be null. 777 if (!Init) 778 return SourceRange(); 779 if (LParenLoc.isInvalid()) 780 return Init->getSourceRange(); 781 return SourceRange(LParenLoc, Init->getLocEnd()); 782 } 783 784 static bool classof(const Stmt *T) { 785 return T->getStmtClass() == CompoundLiteralExprClass; 786 } 787 static bool classof(const CompoundLiteralExpr *) { return true; } 788 789 // Iterators 790 virtual child_iterator child_begin(); 791 virtual child_iterator child_end(); 792 793 virtual void EmitImpl(llvm::Serializer& S) const; 794 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 795}; 796 797/// ImplicitCastExpr - Allows us to explicitly represent implicit type 798/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 799/// float->double, short->int, etc. 800/// 801class ImplicitCastExpr : public Expr { 802 Expr *Op; 803public: 804 ImplicitCastExpr(QualType ty, Expr *op) : 805 Expr(ImplicitCastExprClass, ty), Op(op) {} 806 807 Expr *getSubExpr() { return Op; } 808 const Expr *getSubExpr() const { return Op; } 809 810 virtual SourceRange getSourceRange() const { return Op->getSourceRange(); } 811 812 static bool classof(const Stmt *T) { 813 return T->getStmtClass() == ImplicitCastExprClass; 814 } 815 static bool classof(const ImplicitCastExpr *) { return true; } 816 817 // Iterators 818 virtual child_iterator child_begin(); 819 virtual child_iterator child_end(); 820 821 virtual void EmitImpl(llvm::Serializer& S) const; 822 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 823}; 824 825/// CastExpr - [C99 6.5.4] Cast Operators. 826/// 827class CastExpr : public Expr { 828 Expr *Op; 829 SourceLocation Loc; // the location of the left paren 830public: 831 CastExpr(QualType ty, Expr *op, SourceLocation l) : 832 Expr(CastExprClass, ty), Op(op), Loc(l) {} 833 834 SourceLocation getLParenLoc() const { return Loc; } 835 836 Expr *getSubExpr() const { return Op; } 837 838 virtual SourceRange getSourceRange() const { 839 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 840 } 841 static bool classof(const Stmt *T) { 842 return T->getStmtClass() == CastExprClass; 843 } 844 static bool classof(const CastExpr *) { return true; } 845 846 // Iterators 847 virtual child_iterator child_begin(); 848 virtual child_iterator child_end(); 849 850 virtual void EmitImpl(llvm::Serializer& S) const; 851 static CastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 852}; 853 854class BinaryOperator : public Expr { 855public: 856 enum Opcode { 857 // Operators listed in order of precedence. 858 // Note that additions to this should also update the StmtVisitor class. 859 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 860 Add, Sub, // [C99 6.5.6] Additive operators. 861 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 862 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 863 EQ, NE, // [C99 6.5.9] Equality operators. 864 And, // [C99 6.5.10] Bitwise AND operator. 865 Xor, // [C99 6.5.11] Bitwise XOR operator. 866 Or, // [C99 6.5.12] Bitwise OR operator. 867 LAnd, // [C99 6.5.13] Logical AND operator. 868 LOr, // [C99 6.5.14] Logical OR operator. 869 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 870 DivAssign, RemAssign, 871 AddAssign, SubAssign, 872 ShlAssign, ShrAssign, 873 AndAssign, XorAssign, 874 OrAssign, 875 Comma // [C99 6.5.17] Comma operator. 876 }; 877private: 878 enum { LHS, RHS, END_EXPR }; 879 Expr* SubExprs[END_EXPR]; 880 Opcode Opc; 881 SourceLocation OpLoc; 882public: 883 884 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 885 SourceLocation opLoc) 886 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 887 SubExprs[LHS] = lhs; 888 SubExprs[RHS] = rhs; 889 assert(!isCompoundAssignmentOp() && 890 "Use ArithAssignBinaryOperator for compound assignments"); 891 } 892 893 SourceLocation getOperatorLoc() const { return OpLoc; } 894 Opcode getOpcode() const { return Opc; } 895 Expr *getLHS() const { return SubExprs[LHS]; } 896 Expr *getRHS() const { return SubExprs[RHS]; } 897 virtual SourceRange getSourceRange() const { 898 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 899 } 900 901 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 902 /// corresponds to, e.g. "<<=". 903 static const char *getOpcodeStr(Opcode Op); 904 905 /// predicates to categorize the respective opcodes. 906 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 907 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 908 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 909 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 910 bool isRelationalOp() const { return Opc >= LT && Opc <= GE; } 911 bool isEqualityOp() const { return Opc == EQ || Opc == NE; } 912 bool isLogicalOp() const { return Opc == LAnd || Opc == LOr; } 913 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 914 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 915 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 916 917 static bool classof(const Stmt *S) { 918 return S->getStmtClass() == BinaryOperatorClass || 919 S->getStmtClass() == CompoundAssignOperatorClass; 920 } 921 static bool classof(const BinaryOperator *) { return true; } 922 923 // Iterators 924 virtual child_iterator child_begin(); 925 virtual child_iterator child_end(); 926 927 virtual void EmitImpl(llvm::Serializer& S) const; 928 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 929 930protected: 931 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 932 SourceLocation oploc, bool dead) 933 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 934 SubExprs[LHS] = lhs; 935 SubExprs[RHS] = rhs; 936 } 937}; 938 939/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 940/// track of the type the operation is performed in. Due to the semantics of 941/// these operators, the operands are promoted, the aritmetic performed, an 942/// implicit conversion back to the result type done, then the assignment takes 943/// place. This captures the intermediate type which the computation is done 944/// in. 945class CompoundAssignOperator : public BinaryOperator { 946 QualType ComputationType; 947public: 948 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 949 QualType ResType, QualType CompType, 950 SourceLocation OpLoc) 951 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 952 ComputationType(CompType) { 953 assert(isCompoundAssignmentOp() && 954 "Only should be used for compound assignments"); 955 } 956 957 QualType getComputationType() const { return ComputationType; } 958 959 static bool classof(const CompoundAssignOperator *) { return true; } 960 static bool classof(const Stmt *S) { 961 return S->getStmtClass() == CompoundAssignOperatorClass; 962 } 963 964 virtual void EmitImpl(llvm::Serializer& S) const; 965 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 966 ASTContext& C); 967}; 968 969/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 970/// GNU "missing LHS" extension is in use. 971/// 972class ConditionalOperator : public Expr { 973 enum { COND, LHS, RHS, END_EXPR }; 974 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 975public: 976 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 977 : Expr(ConditionalOperatorClass, t) { 978 SubExprs[COND] = cond; 979 SubExprs[LHS] = lhs; 980 SubExprs[RHS] = rhs; 981 } 982 983 // getCond - Return the expression representing the condition for 984 // the ?: operator. 985 Expr *getCond() const { return SubExprs[COND]; } 986 987 // getTrueExpr - Return the subexpression representing the value of the ?: 988 // expression if the condition evaluates to true. In most cases this value 989 // will be the same as getLHS() except a GCC extension allows the left 990 // subexpression to be omitted, and instead of the condition be returned. 991 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 992 // is only evaluated once. 993 Expr *getTrueExpr() const { 994 return SubExprs[LHS] ? SubExprs[COND] : SubExprs[LHS]; 995 } 996 997 // getTrueExpr - Return the subexpression representing the value of the ?: 998 // expression if the condition evaluates to false. This is the same as getRHS. 999 Expr *getFalseExpr() const { return SubExprs[RHS]; } 1000 1001 Expr *getLHS() const { return SubExprs[LHS]; } 1002 Expr *getRHS() const { return SubExprs[RHS]; } 1003 1004 virtual SourceRange getSourceRange() const { 1005 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1006 } 1007 static bool classof(const Stmt *T) { 1008 return T->getStmtClass() == ConditionalOperatorClass; 1009 } 1010 static bool classof(const ConditionalOperator *) { return true; } 1011 1012 // Iterators 1013 virtual child_iterator child_begin(); 1014 virtual child_iterator child_end(); 1015 1016 virtual void EmitImpl(llvm::Serializer& S) const; 1017 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1018}; 1019 1020/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1021class AddrLabelExpr : public Expr { 1022 SourceLocation AmpAmpLoc, LabelLoc; 1023 LabelStmt *Label; 1024public: 1025 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1026 QualType t) 1027 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1028 1029 virtual SourceRange getSourceRange() const { 1030 return SourceRange(AmpAmpLoc, LabelLoc); 1031 } 1032 1033 LabelStmt *getLabel() const { return Label; } 1034 1035 static bool classof(const Stmt *T) { 1036 return T->getStmtClass() == AddrLabelExprClass; 1037 } 1038 static bool classof(const AddrLabelExpr *) { return true; } 1039 1040 // Iterators 1041 virtual child_iterator child_begin(); 1042 virtual child_iterator child_end(); 1043 1044 virtual void EmitImpl(llvm::Serializer& S) const; 1045 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1046}; 1047 1048/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1049/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1050/// takes the value of the last subexpression. 1051class StmtExpr : public Expr { 1052 CompoundStmt *SubStmt; 1053 SourceLocation LParenLoc, RParenLoc; 1054public: 1055 StmtExpr(CompoundStmt *substmt, QualType T, 1056 SourceLocation lp, SourceLocation rp) : 1057 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1058 1059 CompoundStmt *getSubStmt() { return SubStmt; } 1060 const CompoundStmt *getSubStmt() const { return SubStmt; } 1061 1062 virtual SourceRange getSourceRange() const { 1063 return SourceRange(LParenLoc, RParenLoc); 1064 } 1065 1066 static bool classof(const Stmt *T) { 1067 return T->getStmtClass() == StmtExprClass; 1068 } 1069 static bool classof(const StmtExpr *) { return true; } 1070 1071 // Iterators 1072 virtual child_iterator child_begin(); 1073 virtual child_iterator child_end(); 1074 1075 virtual void EmitImpl(llvm::Serializer& S) const; 1076 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1077}; 1078 1079/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1080/// This AST node represents a function that returns 1 if two *types* (not 1081/// expressions) are compatible. The result of this built-in function can be 1082/// used in integer constant expressions. 1083class TypesCompatibleExpr : public Expr { 1084 QualType Type1; 1085 QualType Type2; 1086 SourceLocation BuiltinLoc, RParenLoc; 1087public: 1088 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1089 QualType t1, QualType t2, SourceLocation RP) : 1090 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1091 BuiltinLoc(BLoc), RParenLoc(RP) {} 1092 1093 QualType getArgType1() const { return Type1; } 1094 QualType getArgType2() const { return Type2; } 1095 1096 virtual SourceRange getSourceRange() const { 1097 return SourceRange(BuiltinLoc, RParenLoc); 1098 } 1099 static bool classof(const Stmt *T) { 1100 return T->getStmtClass() == TypesCompatibleExprClass; 1101 } 1102 static bool classof(const TypesCompatibleExpr *) { return true; } 1103 1104 // Iterators 1105 virtual child_iterator child_begin(); 1106 virtual child_iterator child_end(); 1107}; 1108 1109/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1110/// This AST node is similar to the conditional operator (?:) in C, with 1111/// the following exceptions: 1112/// - the test expression much be a constant expression. 1113/// - the expression returned has it's type unaltered by promotion rules. 1114/// - does not evaluate the expression that was not chosen. 1115class ChooseExpr : public Expr { 1116 enum { COND, LHS, RHS, END_EXPR }; 1117 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1118 SourceLocation BuiltinLoc, RParenLoc; 1119public: 1120 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1121 SourceLocation RP) 1122 : Expr(ChooseExprClass, t), 1123 BuiltinLoc(BLoc), RParenLoc(RP) { 1124 SubExprs[COND] = cond; 1125 SubExprs[LHS] = lhs; 1126 SubExprs[RHS] = rhs; 1127 } 1128 1129 /// isConditionTrue - Return true if the condition is true. This is always 1130 /// statically knowable for a well-formed choosexpr. 1131 bool isConditionTrue(ASTContext &C) const; 1132 1133 Expr *getCond() const { return SubExprs[COND]; } 1134 Expr *getLHS() const { return SubExprs[LHS]; } 1135 Expr *getRHS() const { return SubExprs[RHS]; } 1136 1137 virtual SourceRange getSourceRange() const { 1138 return SourceRange(BuiltinLoc, RParenLoc); 1139 } 1140 static bool classof(const Stmt *T) { 1141 return T->getStmtClass() == ChooseExprClass; 1142 } 1143 static bool classof(const ChooseExpr *) { return true; } 1144 1145 // Iterators 1146 virtual child_iterator child_begin(); 1147 virtual child_iterator child_end(); 1148}; 1149 1150/// OverloadExpr - Clang builtin function __builtin_overload. 1151/// This AST node provides a way to overload functions in C. 1152/// 1153/// The first argument is required to be a constant expression, for the number 1154/// of arguments passed to each candidate function. 1155/// 1156/// The next N arguments, where N is the value of the constant expression, 1157/// are the values to be passed as arguments. 1158/// 1159/// The rest of the arguments are values of pointer to function type, which 1160/// are the candidate functions for overloading. 1161/// 1162/// The result is a equivalent to a CallExpr taking N arguments to the 1163/// candidate function whose parameter types match the types of the N arguments. 1164/// 1165/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1166/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1167/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1168class OverloadExpr : public Expr { 1169 // SubExprs - the list of values passed to the __builtin_overload function. 1170 // SubExpr[0] is a constant expression 1171 // SubExpr[1-N] are the parameters to pass to the matching function call 1172 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1173 Expr **SubExprs; 1174 1175 // NumExprs - the size of the SubExprs array 1176 unsigned NumExprs; 1177 1178 // The index of the matching candidate function 1179 unsigned FnIndex; 1180 1181 SourceLocation BuiltinLoc; 1182 SourceLocation RParenLoc; 1183public: 1184 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1185 SourceLocation bloc, SourceLocation rploc) 1186 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1187 BuiltinLoc(bloc), RParenLoc(rploc) { 1188 SubExprs = new Expr*[nexprs]; 1189 for (unsigned i = 0; i != nexprs; ++i) 1190 SubExprs[i] = args[i]; 1191 } 1192 ~OverloadExpr() { 1193 delete [] SubExprs; 1194 } 1195 1196 /// arg_begin - Return a pointer to the list of arguments that will be passed 1197 /// to the matching candidate function, skipping over the initial constant 1198 /// expression. 1199 typedef Expr * const *arg_const_iterator; 1200 arg_const_iterator arg_begin() const { return SubExprs+1; } 1201 1202 /// getNumArgs - Return the number of arguments to pass to the candidate 1203 /// functions. 1204 unsigned getNumArgs(ASTContext &Ctx) const { 1205 llvm::APSInt constEval(32); 1206 (void) SubExprs[0]->isIntegerConstantExpr(constEval, Ctx); 1207 return constEval.getZExtValue(); 1208 } 1209 1210 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1211 /// constant expression, the actual arguments passed in, and the function 1212 /// pointers. 1213 unsigned getNumSubExprs() const { return NumExprs; } 1214 1215 /// getExpr - Return the Expr at the specified index. 1216 Expr *getExpr(unsigned Index) { 1217 assert((Index < NumExprs) && "Arg access out of range!"); 1218 return SubExprs[Index]; 1219 } 1220 1221 /// getFn - Return the matching candidate function for this OverloadExpr. 1222 Expr *getFn() const { return SubExprs[FnIndex]; } 1223 1224 virtual SourceRange getSourceRange() const { 1225 return SourceRange(BuiltinLoc, RParenLoc); 1226 } 1227 static bool classof(const Stmt *T) { 1228 return T->getStmtClass() == OverloadExprClass; 1229 } 1230 static bool classof(const OverloadExpr *) { return true; } 1231 1232 // Iterators 1233 virtual child_iterator child_begin(); 1234 virtual child_iterator child_end(); 1235}; 1236 1237/// VAArgExpr, used for the builtin function __builtin_va_start. 1238class VAArgExpr : public Expr { 1239 Expr *Val; 1240 SourceLocation BuiltinLoc, RParenLoc; 1241public: 1242 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1243 : Expr(VAArgExprClass, t), 1244 Val(e), 1245 BuiltinLoc(BLoc), 1246 RParenLoc(RPLoc) { } 1247 1248 const Expr *getSubExpr() const { return Val; } 1249 Expr *getSubExpr() { return Val; } 1250 virtual SourceRange getSourceRange() const { 1251 return SourceRange(BuiltinLoc, RParenLoc); 1252 } 1253 static bool classof(const Stmt *T) { 1254 return T->getStmtClass() == VAArgExprClass; 1255 } 1256 static bool classof(const VAArgExpr *) { return true; } 1257 1258 // Iterators 1259 virtual child_iterator child_begin(); 1260 virtual child_iterator child_end(); 1261}; 1262 1263/// InitListExpr - used for struct and array initializers, such as: 1264/// struct foo x = { 1, { 2, 3 } }; 1265/// 1266/// Because C is somewhat loose with braces, the AST does not necessarily 1267/// directly model the C source. Instead, the semantic analyzer aims to make 1268/// the InitListExprs match up with the type of the decl being initialized. We 1269/// have the following exceptions: 1270/// 1271/// 1. Elements at the end of the list may be dropped from the initializer. 1272/// These elements are defined to be initialized to zero. For example: 1273/// int x[20] = { 1 }; 1274/// 2. Initializers may have excess initializers which are to be ignored by the 1275/// compiler. For example: 1276/// int x[1] = { 1, 2 }; 1277/// 3. Redundant InitListExprs may be present around scalar elements. These 1278/// always have a single element whose type is the same as the InitListExpr. 1279/// this can only happen for Type::isScalarType() types. 1280/// int x = { 1 }; int y[2] = { {1}, {2} }; 1281/// 1282class InitListExpr : public Expr { 1283 Expr **InitExprs; 1284 unsigned NumInits; 1285 SourceLocation LBraceLoc, RBraceLoc; 1286public: 1287 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1288 SourceLocation rbraceloc); 1289 ~InitListExpr() { 1290 delete [] InitExprs; 1291 } 1292 1293 unsigned getNumInits() const { return NumInits; } 1294 1295 const Expr* getInit(unsigned Init) const { 1296 assert(Init < NumInits && "Initializer access out of range!"); 1297 return InitExprs[Init]; 1298 } 1299 1300 Expr* getInit(unsigned Init) { 1301 assert(Init < NumInits && "Initializer access out of range!"); 1302 return InitExprs[Init]; 1303 } 1304 1305 void setInit(unsigned Init, Expr *expr) { 1306 assert(Init < NumInits && "Initializer access out of range!"); 1307 InitExprs[Init] = expr; 1308 } 1309 1310 virtual SourceRange getSourceRange() const { 1311 return SourceRange(LBraceLoc, RBraceLoc); 1312 } 1313 static bool classof(const Stmt *T) { 1314 return T->getStmtClass() == InitListExprClass; 1315 } 1316 static bool classof(const InitListExpr *) { 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 InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1324 1325private: 1326 // Used by serializer. 1327 InitListExpr() : Expr(InitListExprClass, QualType()), 1328 InitExprs(NULL), NumInits(0) {} 1329}; 1330 1331/// ObjCStringLiteral, used for Objective-C string literals 1332/// i.e. @"foo". 1333class ObjCStringLiteral : public Expr { 1334 StringLiteral *String; 1335 SourceLocation AtLoc; 1336public: 1337 ObjCStringLiteral(StringLiteral *SL, QualType T, SourceLocation L) 1338 : Expr(ObjCStringLiteralClass, T), String(SL), AtLoc(L) {} 1339 1340 StringLiteral* getString() { return String; } 1341 1342 const StringLiteral* getString() const { return String; } 1343 1344 SourceLocation getAtLoc() const { return AtLoc; } 1345 1346 virtual SourceRange getSourceRange() const { 1347 return SourceRange(AtLoc, String->getLocEnd()); 1348 } 1349 1350 static bool classof(const Stmt *T) { 1351 return T->getStmtClass() == ObjCStringLiteralClass; 1352 } 1353 static bool classof(const ObjCStringLiteral *) { return true; } 1354 1355 // Iterators 1356 virtual child_iterator child_begin(); 1357 virtual child_iterator child_end(); 1358 1359 virtual void EmitImpl(llvm::Serializer& S) const; 1360 static ObjCStringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1361}; 1362 1363/// ObjCEncodeExpr, used for @encode in Objective-C. 1364class ObjCEncodeExpr : public Expr { 1365 QualType EncType; 1366 SourceLocation AtLoc, RParenLoc; 1367public: 1368 ObjCEncodeExpr(QualType T, QualType ET, 1369 SourceLocation at, SourceLocation rp) 1370 : Expr(ObjCEncodeExprClass, T), EncType(ET), AtLoc(at), RParenLoc(rp) {} 1371 1372 SourceLocation getAtLoc() const { return AtLoc; } 1373 SourceLocation getRParenLoc() const { return RParenLoc; } 1374 1375 virtual SourceRange getSourceRange() const { 1376 return SourceRange(AtLoc, RParenLoc); 1377 } 1378 1379 QualType getEncodedType() const { return EncType; } 1380 1381 static bool classof(const Stmt *T) { 1382 return T->getStmtClass() == ObjCEncodeExprClass; 1383 } 1384 static bool classof(const ObjCEncodeExpr *) { return true; } 1385 1386 // Iterators 1387 virtual child_iterator child_begin(); 1388 virtual child_iterator child_end(); 1389 1390 virtual void EmitImpl(llvm::Serializer& S) const; 1391 static ObjCEncodeExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1392}; 1393 1394/// ObjCSelectorExpr used for @selector in Objective-C. 1395class ObjCSelectorExpr : public Expr { 1396 Selector SelName; 1397 SourceLocation AtLoc, RParenLoc; 1398public: 1399 ObjCSelectorExpr(QualType T, Selector selInfo, 1400 SourceLocation at, SourceLocation rp) 1401 : Expr(ObjCSelectorExprClass, T), SelName(selInfo), 1402 AtLoc(at), RParenLoc(rp) {} 1403 1404 Selector getSelector() const { return SelName; } 1405 1406 SourceLocation getAtLoc() const { return AtLoc; } 1407 SourceLocation getRParenLoc() const { return RParenLoc; } 1408 1409 virtual SourceRange getSourceRange() const { 1410 return SourceRange(AtLoc, RParenLoc); 1411 } 1412 1413 /// getNumArgs - Return the number of actual arguments to this call. 1414 unsigned getNumArgs() const { return SelName.getNumArgs(); } 1415 1416 static bool classof(const Stmt *T) { 1417 return T->getStmtClass() == ObjCSelectorExprClass; 1418 } 1419 static bool classof(const ObjCSelectorExpr *) { return true; } 1420 1421 // Iterators 1422 virtual child_iterator child_begin(); 1423 virtual child_iterator child_end(); 1424 1425 virtual void EmitImpl(llvm::Serializer& S) const; 1426 static ObjCSelectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1427}; 1428 1429/// ObjCProtocolExpr used for protocol in Objective-C. 1430class ObjCProtocolExpr : public Expr { 1431 ObjCProtocolDecl *Protocol; 1432 SourceLocation AtLoc, RParenLoc; 1433public: 1434 ObjCProtocolExpr(QualType T, ObjCProtocolDecl *protocol, 1435 SourceLocation at, SourceLocation rp) 1436 : Expr(ObjCProtocolExprClass, T), Protocol(protocol), 1437 AtLoc(at), RParenLoc(rp) {} 1438 1439 ObjCProtocolDecl *getProtocol() const { return Protocol; } 1440 1441 SourceLocation getAtLoc() const { return AtLoc; } 1442 SourceLocation getRParenLoc() const { return RParenLoc; } 1443 1444 virtual SourceRange getSourceRange() const { 1445 return SourceRange(AtLoc, RParenLoc); 1446 } 1447 1448 static bool classof(const Stmt *T) { 1449 return T->getStmtClass() == ObjCProtocolExprClass; 1450 } 1451 static bool classof(const ObjCProtocolExpr *) { return true; } 1452 1453 // Iterators 1454 virtual child_iterator child_begin(); 1455 virtual child_iterator child_end(); 1456}; 1457 1458/// ObjCIvarRefExpr - A reference to an ObjC instance variable. 1459class ObjCIvarRefExpr : public Expr { 1460 class ObjCIvarDecl *D; 1461 SourceLocation Loc; 1462 Expr *Base; 1463 bool IsArrow:1; // True if this is "X->F", false if this is "X.F". 1464 bool IsFreeIvar:1; // True if ivar reference has no base (self assumed). 1465 1466public: 1467 ObjCIvarRefExpr(ObjCIvarDecl *d, QualType t, SourceLocation l, Expr *base=0, 1468 bool arrow = false, bool freeIvar = false) : 1469 Expr(ObjCIvarRefExprClass, t), D(d), Loc(l), Base(base), IsArrow(arrow), 1470 IsFreeIvar(freeIvar) {} 1471 1472 ObjCIvarDecl *getDecl() { return D; } 1473 const ObjCIvarDecl *getDecl() const { return D; } 1474 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 1475 const Expr *getBase() const { return Base; } 1476 Expr *getBase() { return Base; } 1477 void setBase(Expr * base) { Base = base; } 1478 bool isArrow() const { return IsArrow; } 1479 bool isFreeIvar() const { return IsFreeIvar; } 1480 1481 SourceLocation getLocation() const { return Loc; } 1482 1483 static bool classof(const Stmt *T) { 1484 return T->getStmtClass() == ObjCIvarRefExprClass; 1485 } 1486 static bool classof(const ObjCIvarRefExpr *) { return true; } 1487 1488 // Iterators 1489 virtual child_iterator child_begin(); 1490 virtual child_iterator child_end(); 1491 1492 virtual void EmitImpl(llvm::Serializer& S) const; 1493 static ObjCIvarRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1494}; 1495 1496class ObjCMessageExpr : public Expr { 1497 enum { RECEIVER=0, ARGS_START=1 }; 1498 1499 Expr **SubExprs; 1500 1501 unsigned NumArgs; 1502 1503 // A unigue name for this message. 1504 Selector SelName; 1505 1506 // A method prototype for this message (optional). 1507 // FIXME: Since method decls contain the selector, and most messages have a 1508 // prototype, consider devising a scheme for unifying SelName/MethodProto. 1509 ObjCMethodDecl *MethodProto; 1510 1511 IdentifierInfo *ClassName; // optional - 0 for instance messages. 1512 1513 SourceLocation LBracloc, RBracloc; 1514public: 1515 // constructor for class messages. 1516 // FIXME: clsName should be typed to ObjCInterfaceType 1517 ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1518 QualType retType, ObjCMethodDecl *methDecl, 1519 SourceLocation LBrac, SourceLocation RBrac, 1520 Expr **ArgExprs, unsigned NumArgs); 1521 // constructor for instance messages. 1522 ObjCMessageExpr(Expr *receiver, Selector selInfo, 1523 QualType retType, ObjCMethodDecl *methDecl, 1524 SourceLocation LBrac, SourceLocation RBrac, 1525 Expr **ArgExprs, unsigned NumArgs); 1526 ~ObjCMessageExpr() { 1527 delete [] SubExprs; 1528 } 1529 1530 const Expr *getReceiver() const { return SubExprs[RECEIVER]; } 1531 Expr *getReceiver() { return SubExprs[RECEIVER]; } 1532 1533 Selector getSelector() const { return SelName; } 1534 1535 const ObjCMethodDecl *getMethodDecl() const { return MethodProto; } 1536 ObjCMethodDecl *getMethodDecl() { return MethodProto; } 1537 1538 const IdentifierInfo *getClassName() const { return ClassName; } 1539 IdentifierInfo *getClassName() { return ClassName; } 1540 1541 /// getNumArgs - Return the number of actual arguments to this call. 1542 unsigned getNumArgs() const { return NumArgs; } 1543 1544/// getArg - Return the specified argument. 1545 Expr *getArg(unsigned Arg) { 1546 assert(Arg < NumArgs && "Arg access out of range!"); 1547 return SubExprs[Arg+ARGS_START]; 1548 } 1549 const Expr *getArg(unsigned Arg) const { 1550 assert(Arg < NumArgs && "Arg access out of range!"); 1551 return SubExprs[Arg+ARGS_START]; 1552 } 1553 /// setArg - Set the specified argument. 1554 void setArg(unsigned Arg, Expr *ArgExpr) { 1555 assert(Arg < NumArgs && "Arg access out of range!"); 1556 SubExprs[Arg+ARGS_START] = ArgExpr; 1557 } 1558 1559 virtual SourceRange getSourceRange() const { 1560 return SourceRange(LBracloc, RBracloc); 1561 } 1562 1563 static bool classof(const Stmt *T) { 1564 return T->getStmtClass() == ObjCMessageExprClass; 1565 } 1566 static bool classof(const ObjCMessageExpr *) { return true; } 1567 1568 // Iterators 1569 virtual child_iterator child_begin(); 1570 virtual child_iterator child_end(); 1571 1572 typedef Expr** arg_iterator; 1573 typedef const Expr* const* const_arg_iterator; 1574 1575 arg_iterator arg_begin() { return &SubExprs[ARGS_START]; } 1576 arg_iterator arg_end() { return arg_begin() + NumArgs; } 1577 const_arg_iterator arg_begin() const { return &SubExprs[ARGS_START]; } 1578 const_arg_iterator arg_end() const { return arg_begin() + NumArgs; } 1579}; 1580 1581} // end namespace clang 1582 1583#endif 1584