Expr.h revision 56f349400c5932a196509c0480ff6f99a9a0b48f
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 /// hasStaticStorage - 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 hasStaticStorage() 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) { 138 return cast<Expr>(Stmt::Create(D)); 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); 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); 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); 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); 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); 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); 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); 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 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); 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 isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 439 bool isSizeOfAlignOfOp() const { return Opc == SizeOf || Opc == AlignOf; } 440 bool isOffsetOfOp() const { return Opc == OffsetOf; } 441 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 442 443 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 444 /// corresponds to, e.g. "sizeof" or "[pre]++" 445 static const char *getOpcodeStr(Opcode Op); 446 447 virtual SourceRange getSourceRange() const { 448 if (isPostfix()) 449 return SourceRange(Val->getLocStart(), Loc); 450 else 451 return SourceRange(Loc, Val->getLocEnd()); 452 } 453 virtual SourceLocation getExprLoc() const { return Loc; } 454 455 static bool classof(const Stmt *T) { 456 return T->getStmtClass() == UnaryOperatorClass; 457 } 458 static bool classof(const UnaryOperator *) { return true; } 459 460 int64_t evaluateOffsetOf(ASTContext& C) const; 461 462 // Iterators 463 virtual child_iterator child_begin(); 464 virtual child_iterator child_end(); 465 466 virtual void EmitImpl(llvm::Serializer& S) const; 467 static UnaryOperator* CreateImpl(llvm::Deserializer& D); 468}; 469 470/// SizeOfAlignOfTypeExpr - [C99 6.5.3.4] - This is only for sizeof/alignof of 471/// *types*. sizeof(expr) is handled by UnaryOperator. 472class SizeOfAlignOfTypeExpr : public Expr { 473 bool isSizeof; // true if sizeof, false if alignof. 474 QualType Ty; 475 SourceLocation OpLoc, RParenLoc; 476public: 477 SizeOfAlignOfTypeExpr(bool issizeof, QualType argType, QualType resultType, 478 SourceLocation op, SourceLocation rp) : 479 Expr(SizeOfAlignOfTypeExprClass, resultType), 480 isSizeof(issizeof), Ty(argType), OpLoc(op), RParenLoc(rp) {} 481 482 bool isSizeOf() const { return isSizeof; } 483 QualType getArgumentType() const { return Ty; } 484 485 SourceLocation getOperatorLoc() const { return OpLoc; } 486 SourceRange getSourceRange() const { return SourceRange(OpLoc, RParenLoc); } 487 488 static bool classof(const Stmt *T) { 489 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 490 } 491 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 492 493 // Iterators 494 virtual child_iterator child_begin(); 495 virtual child_iterator child_end(); 496 497 virtual void EmitImpl(llvm::Serializer& S) const; 498 static SizeOfAlignOfTypeExpr* CreateImpl(llvm::Deserializer& D); 499}; 500 501//===----------------------------------------------------------------------===// 502// Postfix Operators. 503//===----------------------------------------------------------------------===// 504 505/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 506class ArraySubscriptExpr : public Expr { 507 enum { LHS, RHS, END_EXPR=2 }; 508 Expr* SubExprs[END_EXPR]; 509 SourceLocation RBracketLoc; 510public: 511 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 512 SourceLocation rbracketloc) 513 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 514 SubExprs[LHS] = lhs; 515 SubExprs[RHS] = rhs; 516 } 517 518 /// An array access can be written A[4] or 4[A] (both are equivalent). 519 /// - getBase() and getIdx() always present the normalized view: A[4]. 520 /// In this case getBase() returns "A" and getIdx() returns "4". 521 /// - getLHS() and getRHS() present the syntactic view. e.g. for 522 /// 4[A] getLHS() returns "4". 523 /// Note: Because vector element access is also written A[4] we must 524 /// predicate the format conversion in getBase and getIdx only on the 525 /// the type of the RHS, as it is possible for the LHS to be a vector of 526 /// integer type 527 Expr *getLHS() { return SubExprs[LHS]; } 528 const Expr *getLHS() const { return SubExprs[LHS]; } 529 530 Expr *getRHS() { return SubExprs[RHS]; } 531 const Expr *getRHS() const { return SubExprs[RHS]; } 532 533 Expr *getBase() { 534 return (getRHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 535 } 536 537 const Expr *getBase() const { 538 return (getRHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 539 } 540 541 Expr *getIdx() { 542 return (getRHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 543 } 544 545 const Expr *getIdx() const { 546 return (getRHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 547 } 548 549 550 SourceRange getSourceRange() const { 551 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 552 } 553 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 554 555 static bool classof(const Stmt *T) { 556 return T->getStmtClass() == ArraySubscriptExprClass; 557 } 558 static bool classof(const ArraySubscriptExpr *) { return true; } 559 560 // Iterators 561 virtual child_iterator child_begin(); 562 virtual child_iterator child_end(); 563 564 virtual void EmitImpl(llvm::Serializer& S) const; 565 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D); 566}; 567 568 569/// CallExpr - [C99 6.5.2.2] Function Calls. 570/// 571class CallExpr : public Expr { 572 enum { FN=0, ARGS_START=1 }; 573 Expr **SubExprs; 574 unsigned NumArgs; 575 SourceLocation RParenLoc; 576 577 // This version of the ctor is for deserialization. 578 CallExpr(Expr** subexprs, unsigned numargs, QualType t, 579 SourceLocation rparenloc) 580 : Expr(CallExprClass,t), SubExprs(subexprs), 581 NumArgs(numargs), RParenLoc(rparenloc) {} 582 583public: 584 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 585 SourceLocation rparenloc); 586 ~CallExpr() { 587 delete [] SubExprs; 588 } 589 590 const Expr *getCallee() const { return SubExprs[FN]; } 591 Expr *getCallee() { return SubExprs[FN]; } 592 void setCallee(Expr *F) { SubExprs[FN] = F; } 593 594 /// getNumArgs - Return the number of actual arguments to this call. 595 /// 596 unsigned getNumArgs() const { return NumArgs; } 597 598 /// getArg - Return the specified argument. 599 Expr *getArg(unsigned Arg) { 600 assert(Arg < NumArgs && "Arg access out of range!"); 601 return SubExprs[Arg+ARGS_START]; 602 } 603 const Expr *getArg(unsigned Arg) const { 604 assert(Arg < NumArgs && "Arg access out of range!"); 605 return SubExprs[Arg+ARGS_START]; 606 } 607 /// setArg - Set the specified argument. 608 void setArg(unsigned Arg, Expr *ArgExpr) { 609 assert(Arg < NumArgs && "Arg access out of range!"); 610 SubExprs[Arg+ARGS_START] = ArgExpr; 611 } 612 613 /// setNumArgs - This changes the number of arguments present in this call. 614 /// Any orphaned expressions are deleted by this, and any new operands are set 615 /// to null. 616 void setNumArgs(unsigned NumArgs); 617 618 typedef Expr **arg_iterator; 619 typedef Expr * const *arg_const_iterator; 620 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 621 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 622 arg_const_iterator arg_begin() const { return SubExprs+ARGS_START; } 623 arg_const_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs(); } 624 625 626 /// getNumCommas - Return the number of commas that must have been present in 627 /// this function call. 628 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 629 630 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 631 632 /// isBuiltinConstantExpr - Return true if this built-in call is constant. 633 bool isBuiltinConstantExpr() const; 634 635 SourceLocation getRParenLoc() const { return RParenLoc; } 636 SourceRange getSourceRange() const { 637 return SourceRange(getCallee()->getLocStart(), RParenLoc); 638 } 639 640 static bool classof(const Stmt *T) { 641 return T->getStmtClass() == CallExprClass; 642 } 643 static bool classof(const CallExpr *) { return true; } 644 645 // Iterators 646 virtual child_iterator child_begin(); 647 virtual child_iterator child_end(); 648 649 virtual void EmitImpl(llvm::Serializer& S) const; 650 static CallExpr* CreateImpl(llvm::Deserializer& D); 651}; 652 653/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 654/// 655class MemberExpr : public Expr { 656 Expr *Base; 657 FieldDecl *MemberDecl; 658 SourceLocation MemberLoc; 659 bool IsArrow; // True if this is "X->F", false if this is "X.F". 660public: 661 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l, 662 QualType ty) 663 : Expr(MemberExprClass, ty), 664 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 665 666 Expr *getBase() const { return Base; } 667 FieldDecl *getMemberDecl() const { return MemberDecl; } 668 bool isArrow() const { return IsArrow; } 669 670 virtual SourceRange getSourceRange() const { 671 return SourceRange(getBase()->getLocStart(), MemberLoc); 672 } 673 virtual SourceLocation getExprLoc() const { return MemberLoc; } 674 675 static bool classof(const Stmt *T) { 676 return T->getStmtClass() == MemberExprClass; 677 } 678 static bool classof(const MemberExpr *) { return true; } 679 680 // Iterators 681 virtual child_iterator child_begin(); 682 virtual child_iterator child_end(); 683 684 virtual void EmitImpl(llvm::Serializer& S) const; 685 static MemberExpr* CreateImpl(llvm::Deserializer& D); 686}; 687 688/// OCUVectorElementExpr - This represents access to specific elements of a 689/// vector, and may occur on the left hand side or right hand side. For example 690/// the following is legal: "V.xy = V.zw" if V is a 4 element ocu vector. 691/// 692class OCUVectorElementExpr : public Expr { 693 Expr *Base; 694 IdentifierInfo &Accessor; 695 SourceLocation AccessorLoc; 696public: 697 enum ElementType { 698 Point, // xywz 699 Color, // rgba 700 Texture // stpq 701 }; 702 OCUVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 703 SourceLocation loc) 704 : Expr(OCUVectorElementExprClass, ty), 705 Base(base), Accessor(accessor), AccessorLoc(loc) {} 706 707 const Expr *getBase() const { return Base; } 708 Expr *getBase() { return Base; } 709 710 IdentifierInfo &getAccessor() const { return Accessor; } 711 712 /// getNumElements - Get the number of components being selected. 713 unsigned getNumElements() const; 714 715 /// getElementType - Determine whether the components of this access are 716 /// "point" "color" or "texture" elements. 717 ElementType getElementType() const; 718 719 /// containsDuplicateElements - Return true if any element access is 720 /// repeated. 721 bool containsDuplicateElements() const; 722 723 /// getEncodedElementAccess - Encode the elements accessed into a bit vector. 724 /// The encoding currently uses 2-bit bitfields, but clients should use the 725 /// accessors below to access them. 726 /// 727 unsigned getEncodedElementAccess() const; 728 729 /// getAccessedFieldNo - Given an encoded value and a result number, return 730 /// the input field number being accessed. 731 static unsigned getAccessedFieldNo(unsigned Idx, unsigned EncodedVal) { 732 return (EncodedVal >> (Idx*2)) & 3; 733 } 734 735 virtual SourceRange getSourceRange() const { 736 return SourceRange(getBase()->getLocStart(), AccessorLoc); 737 } 738 static bool classof(const Stmt *T) { 739 return T->getStmtClass() == OCUVectorElementExprClass; 740 } 741 static bool classof(const OCUVectorElementExpr *) { return true; } 742 743 // Iterators 744 virtual child_iterator child_begin(); 745 virtual child_iterator child_end(); 746}; 747 748/// CompoundLiteralExpr - [C99 6.5.2.5] 749/// 750class CompoundLiteralExpr : public Expr { 751 /// LParenLoc - If non-null, this is the location of the left paren in a 752 /// compound literal like "(int){4}". This can be null if this is a 753 /// synthesized compound expression. 754 SourceLocation LParenLoc; 755 Expr *Init; 756 bool FileScope; 757public: 758 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, bool fileScope) : 759 Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), FileScope(fileScope) {} 760 761 const Expr *getInitializer() const { return Init; } 762 Expr *getInitializer() { return Init; } 763 764 bool isFileScope() const { return FileScope; } 765 766 SourceLocation getLParenLoc() const { return LParenLoc; } 767 768 virtual SourceRange getSourceRange() const { 769 // FIXME: Init should never be null. 770 if (!Init) 771 return SourceRange(); 772 if (LParenLoc.isInvalid()) 773 return Init->getSourceRange(); 774 return SourceRange(LParenLoc, Init->getLocEnd()); 775 } 776 777 static bool classof(const Stmt *T) { 778 return T->getStmtClass() == CompoundLiteralExprClass; 779 } 780 static bool classof(const CompoundLiteralExpr *) { return true; } 781 782 // Iterators 783 virtual child_iterator child_begin(); 784 virtual child_iterator child_end(); 785 786 virtual void EmitImpl(llvm::Serializer& S) const; 787 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D); 788}; 789 790/// ImplicitCastExpr - Allows us to explicitly represent implicit type 791/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 792/// float->double, short->int, etc. 793/// 794class ImplicitCastExpr : public Expr { 795 Expr *Op; 796public: 797 ImplicitCastExpr(QualType ty, Expr *op) : 798 Expr(ImplicitCastExprClass, ty), Op(op) {} 799 800 Expr *getSubExpr() { return Op; } 801 const Expr *getSubExpr() const { return Op; } 802 803 virtual SourceRange getSourceRange() const { return Op->getSourceRange(); } 804 805 static bool classof(const Stmt *T) { 806 return T->getStmtClass() == ImplicitCastExprClass; 807 } 808 static bool classof(const ImplicitCastExpr *) { return true; } 809 810 // Iterators 811 virtual child_iterator child_begin(); 812 virtual child_iterator child_end(); 813 814 virtual void EmitImpl(llvm::Serializer& S) const; 815 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D); 816}; 817 818/// CastExpr - [C99 6.5.4] Cast Operators. 819/// 820class CastExpr : public Expr { 821 Expr *Op; 822 SourceLocation Loc; // the location of the left paren 823public: 824 CastExpr(QualType ty, Expr *op, SourceLocation l) : 825 Expr(CastExprClass, ty), Op(op), Loc(l) {} 826 827 SourceLocation getLParenLoc() const { return Loc; } 828 829 Expr *getSubExpr() const { return Op; } 830 831 virtual SourceRange getSourceRange() const { 832 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 833 } 834 static bool classof(const Stmt *T) { 835 return T->getStmtClass() == CastExprClass; 836 } 837 static bool classof(const CastExpr *) { return true; } 838 839 // Iterators 840 virtual child_iterator child_begin(); 841 virtual child_iterator child_end(); 842 843 virtual void EmitImpl(llvm::Serializer& S) const; 844 static CastExpr* CreateImpl(llvm::Deserializer& D); 845}; 846 847class BinaryOperator : public Expr { 848public: 849 enum Opcode { 850 // Operators listed in order of precedence. 851 // Note that additions to this should also update the StmtVisitor class. 852 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 853 Add, Sub, // [C99 6.5.6] Additive operators. 854 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 855 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 856 EQ, NE, // [C99 6.5.9] Equality operators. 857 And, // [C99 6.5.10] Bitwise AND operator. 858 Xor, // [C99 6.5.11] Bitwise XOR operator. 859 Or, // [C99 6.5.12] Bitwise OR operator. 860 LAnd, // [C99 6.5.13] Logical AND operator. 861 LOr, // [C99 6.5.14] Logical OR operator. 862 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 863 DivAssign, RemAssign, 864 AddAssign, SubAssign, 865 ShlAssign, ShrAssign, 866 AndAssign, XorAssign, 867 OrAssign, 868 Comma // [C99 6.5.17] Comma operator. 869 }; 870private: 871 enum { LHS, RHS, END_EXPR }; 872 Expr* SubExprs[END_EXPR]; 873 Opcode Opc; 874 SourceLocation OpLoc; 875public: 876 877 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 878 SourceLocation opLoc) 879 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 880 SubExprs[LHS] = lhs; 881 SubExprs[RHS] = rhs; 882 assert(!isCompoundAssignmentOp() && 883 "Use ArithAssignBinaryOperator for compound assignments"); 884 } 885 886 SourceLocation getOperatorLoc() const { return OpLoc; } 887 Opcode getOpcode() const { return Opc; } 888 Expr *getLHS() const { return SubExprs[LHS]; } 889 Expr *getRHS() const { return SubExprs[RHS]; } 890 virtual SourceRange getSourceRange() const { 891 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 892 } 893 894 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 895 /// corresponds to, e.g. "<<=". 896 static const char *getOpcodeStr(Opcode Op); 897 898 /// predicates to categorize the respective opcodes. 899 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 900 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 901 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 902 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 903 bool isRelationalOp() const { return Opc >= LT && Opc <= GE; } 904 bool isEqualityOp() const { return Opc == EQ || Opc == NE; } 905 bool isLogicalOp() const { return Opc == LAnd || Opc == LOr; } 906 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 907 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 908 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 909 910 static bool classof(const Stmt *S) { 911 return S->getStmtClass() == BinaryOperatorClass || 912 S->getStmtClass() == CompoundAssignOperatorClass; 913 } 914 static bool classof(const BinaryOperator *) { return true; } 915 916 // Iterators 917 virtual child_iterator child_begin(); 918 virtual child_iterator child_end(); 919 920 virtual void EmitImpl(llvm::Serializer& S) const; 921 static BinaryOperator* CreateImpl(llvm::Deserializer& D); 922 923protected: 924 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 925 SourceLocation oploc, bool dead) 926 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 927 SubExprs[LHS] = lhs; 928 SubExprs[RHS] = rhs; 929 } 930}; 931 932/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 933/// track of the type the operation is performed in. Due to the semantics of 934/// these operators, the operands are promoted, the aritmetic performed, an 935/// implicit conversion back to the result type done, then the assignment takes 936/// place. This captures the intermediate type which the computation is done 937/// in. 938class CompoundAssignOperator : public BinaryOperator { 939 QualType ComputationType; 940public: 941 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 942 QualType ResType, QualType CompType, 943 SourceLocation OpLoc) 944 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 945 ComputationType(CompType) { 946 assert(isCompoundAssignmentOp() && 947 "Only should be used for compound assignments"); 948 } 949 950 QualType getComputationType() const { return ComputationType; } 951 952 static bool classof(const CompoundAssignOperator *) { return true; } 953 static bool classof(const Stmt *S) { 954 return S->getStmtClass() == CompoundAssignOperatorClass; 955 } 956 957 virtual void EmitImpl(llvm::Serializer& S) const; 958 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D); 959}; 960 961/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 962/// GNU "missing LHS" extension is in use. 963/// 964class ConditionalOperator : public Expr { 965 enum { COND, LHS, RHS, END_EXPR }; 966 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 967public: 968 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 969 : Expr(ConditionalOperatorClass, t) { 970 SubExprs[COND] = cond; 971 SubExprs[LHS] = lhs; 972 SubExprs[RHS] = rhs; 973 } 974 975 // getCond - Return the expression representing the condition for 976 // the ?: operator. 977 Expr *getCond() const { return SubExprs[COND]; } 978 979 // getTrueExpr - Return the subexpression representing the value of the ?: 980 // expression if the condition evaluates to true. In most cases this value 981 // will be the same as getLHS() except a GCC extension allows the left 982 // subexpression to be omitted, and instead of the condition be returned. 983 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 984 // is only evaluated once. 985 Expr *getTrueExpr() const { 986 return SubExprs[LHS] ? SubExprs[COND] : SubExprs[LHS]; 987 } 988 989 // getTrueExpr - Return the subexpression representing the value of the ?: 990 // expression if the condition evaluates to false. This is the same as getRHS. 991 Expr *getFalseExpr() const { return SubExprs[RHS]; } 992 993 Expr *getLHS() const { return SubExprs[LHS]; } 994 Expr *getRHS() const { return SubExprs[RHS]; } 995 996 virtual SourceRange getSourceRange() const { 997 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 998 } 999 static bool classof(const Stmt *T) { 1000 return T->getStmtClass() == ConditionalOperatorClass; 1001 } 1002 static bool classof(const ConditionalOperator *) { return true; } 1003 1004 // Iterators 1005 virtual child_iterator child_begin(); 1006 virtual child_iterator child_end(); 1007 1008 virtual void EmitImpl(llvm::Serializer& S) const; 1009 static ConditionalOperator* CreateImpl(llvm::Deserializer& D); 1010}; 1011 1012/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1013class AddrLabelExpr : public Expr { 1014 SourceLocation AmpAmpLoc, LabelLoc; 1015 LabelStmt *Label; 1016public: 1017 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1018 QualType t) 1019 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1020 1021 virtual SourceRange getSourceRange() const { 1022 return SourceRange(AmpAmpLoc, LabelLoc); 1023 } 1024 1025 LabelStmt *getLabel() const { return Label; } 1026 1027 static bool classof(const Stmt *T) { 1028 return T->getStmtClass() == AddrLabelExprClass; 1029 } 1030 static bool classof(const AddrLabelExpr *) { return true; } 1031 1032 // Iterators 1033 virtual child_iterator child_begin(); 1034 virtual child_iterator child_end(); 1035 1036 virtual void EmitImpl(llvm::Serializer& S) const; 1037 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D); 1038}; 1039 1040/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1041/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1042/// takes the value of the last subexpression. 1043class StmtExpr : public Expr { 1044 CompoundStmt *SubStmt; 1045 SourceLocation LParenLoc, RParenLoc; 1046public: 1047 StmtExpr(CompoundStmt *substmt, QualType T, 1048 SourceLocation lp, SourceLocation rp) : 1049 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1050 1051 CompoundStmt *getSubStmt() { return SubStmt; } 1052 const CompoundStmt *getSubStmt() const { return SubStmt; } 1053 1054 virtual SourceRange getSourceRange() const { 1055 return SourceRange(LParenLoc, RParenLoc); 1056 } 1057 1058 static bool classof(const Stmt *T) { 1059 return T->getStmtClass() == StmtExprClass; 1060 } 1061 static bool classof(const StmtExpr *) { return true; } 1062 1063 // Iterators 1064 virtual child_iterator child_begin(); 1065 virtual child_iterator child_end(); 1066 1067 virtual void EmitImpl(llvm::Serializer& S) const; 1068 static StmtExpr* CreateImpl(llvm::Deserializer& D); 1069}; 1070 1071/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1072/// This AST node represents a function that returns 1 if two *types* (not 1073/// expressions) are compatible. The result of this built-in function can be 1074/// used in integer constant expressions. 1075class TypesCompatibleExpr : public Expr { 1076 QualType Type1; 1077 QualType Type2; 1078 SourceLocation BuiltinLoc, RParenLoc; 1079public: 1080 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1081 QualType t1, QualType t2, SourceLocation RP) : 1082 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1083 BuiltinLoc(BLoc), RParenLoc(RP) {} 1084 1085 QualType getArgType1() const { return Type1; } 1086 QualType getArgType2() const { return Type2; } 1087 1088 virtual SourceRange getSourceRange() const { 1089 return SourceRange(BuiltinLoc, RParenLoc); 1090 } 1091 static bool classof(const Stmt *T) { 1092 return T->getStmtClass() == TypesCompatibleExprClass; 1093 } 1094 static bool classof(const TypesCompatibleExpr *) { return true; } 1095 1096 // Iterators 1097 virtual child_iterator child_begin(); 1098 virtual child_iterator child_end(); 1099}; 1100 1101/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1102/// This AST node is similar to the conditional operator (?:) in C, with 1103/// the following exceptions: 1104/// - the test expression much be a constant expression. 1105/// - the expression returned has it's type unaltered by promotion rules. 1106/// - does not evaluate the expression that was not chosen. 1107class ChooseExpr : public Expr { 1108 enum { COND, LHS, RHS, END_EXPR }; 1109 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1110 SourceLocation BuiltinLoc, RParenLoc; 1111public: 1112 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1113 SourceLocation RP) 1114 : Expr(ChooseExprClass, t), 1115 BuiltinLoc(BLoc), RParenLoc(RP) { 1116 SubExprs[COND] = cond; 1117 SubExprs[LHS] = lhs; 1118 SubExprs[RHS] = rhs; 1119 } 1120 1121 /// isConditionTrue - Return true if the condition is true. This is always 1122 /// statically knowable for a well-formed choosexpr. 1123 bool isConditionTrue(ASTContext &C) const; 1124 1125 Expr *getCond() const { return SubExprs[COND]; } 1126 Expr *getLHS() const { return SubExprs[LHS]; } 1127 Expr *getRHS() const { return SubExprs[RHS]; } 1128 1129 virtual SourceRange getSourceRange() const { 1130 return SourceRange(BuiltinLoc, RParenLoc); 1131 } 1132 static bool classof(const Stmt *T) { 1133 return T->getStmtClass() == ChooseExprClass; 1134 } 1135 static bool classof(const ChooseExpr *) { return true; } 1136 1137 // Iterators 1138 virtual child_iterator child_begin(); 1139 virtual child_iterator child_end(); 1140}; 1141 1142/// OverloadExpr - Clang builtin-in function __builtin_overload. 1143/// This AST node provides a way to overload functions in C. 1144/// 1145/// The first argument is required to be a constant expression, for the number 1146/// of arguments passed to each candidate function. 1147/// 1148/// The next N arguments, where N is the value of the constant expression, 1149/// are the values to be passed as arguments. 1150/// 1151/// The rest of the arguments are values of pointer to function type, which 1152/// are the candidate functions for overloading. 1153/// 1154/// The result is a equivalent to a CallExpr taking N arguments to the 1155/// candidate function whose parameter types match the types of the N arguments. 1156/// 1157/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1158/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1159/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1160class OverloadExpr : public Expr { 1161 // SubExprs - the list of values passed to the __builtin_overload function. 1162 // SubExpr[0] is a constant expression 1163 // SubExpr[1-N] are the parameters to pass to the matching function call 1164 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1165 Expr **SubExprs; 1166 1167 // NumExprs - the size of the SubExprs array 1168 unsigned NumExprs; 1169 1170 // The index of the matching candidate function 1171 unsigned FnIndex; 1172 1173 SourceLocation BuiltinLoc; 1174 SourceLocation RParenLoc; 1175public: 1176 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1177 SourceLocation bloc, SourceLocation rploc) 1178 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1179 BuiltinLoc(bloc), RParenLoc(rploc) { 1180 SubExprs = new Expr*[nexprs]; 1181 for (unsigned i = 0; i != nexprs; ++i) 1182 SubExprs[i] = args[i]; 1183 } 1184 ~OverloadExpr() { 1185 delete [] SubExprs; 1186 } 1187 1188 /// arg_begin - Return a pointer to the list of arguments that will be passed 1189 /// to the matching candidate function, skipping over the initial constant 1190 /// expression. 1191 typedef Expr * const *arg_const_iterator; 1192 arg_const_iterator arg_begin() const { return SubExprs+1; } 1193 1194 /// getNumArgs - Return the number of arguments to pass to the candidate 1195 /// functions. 1196 unsigned getNumArgs(ASTContext &Ctx) const { 1197 llvm::APSInt constEval(32); 1198 (void) SubExprs[0]->isIntegerConstantExpr(constEval, Ctx); 1199 return constEval.getZExtValue(); 1200 } 1201 1202 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1203 /// constant expression, the actual arguments passed in, and the function 1204 /// pointers. 1205 unsigned getNumSubExprs() const { return NumExprs; } 1206 1207 /// getExpr - Return the Expr at the specified index. 1208 Expr *getExpr(unsigned Index) { 1209 assert((Index < NumExprs) && "Arg access out of range!"); 1210 return SubExprs[Index]; 1211 } 1212 1213 /// getFn - Return the matching candidate function for this OverloadExpr. 1214 Expr *getFn() const { return SubExprs[FnIndex]; } 1215 1216 virtual SourceRange getSourceRange() const { 1217 return SourceRange(BuiltinLoc, RParenLoc); 1218 } 1219 static bool classof(const Stmt *T) { 1220 return T->getStmtClass() == OverloadExprClass; 1221 } 1222 static bool classof(const OverloadExpr *) { return true; } 1223 1224 // Iterators 1225 virtual child_iterator child_begin(); 1226 virtual child_iterator child_end(); 1227}; 1228 1229/// VAArgExpr, used for the builtin function __builtin_va_start. 1230class VAArgExpr : public Expr { 1231 Expr *Val; 1232 SourceLocation BuiltinLoc, RParenLoc; 1233public: 1234 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1235 : Expr(VAArgExprClass, t), 1236 Val(e), 1237 BuiltinLoc(BLoc), 1238 RParenLoc(RPLoc) { } 1239 1240 const Expr *getSubExpr() const { return Val; } 1241 Expr *getSubExpr() { return Val; } 1242 virtual SourceRange getSourceRange() const { 1243 return SourceRange(BuiltinLoc, RParenLoc); 1244 } 1245 static bool classof(const Stmt *T) { 1246 return T->getStmtClass() == VAArgExprClass; 1247 } 1248 static bool classof(const VAArgExpr *) { return true; } 1249 1250 // Iterators 1251 virtual child_iterator child_begin(); 1252 virtual child_iterator child_end(); 1253}; 1254 1255/// InitListExpr - used for struct and array initializers, such as: 1256/// struct foo x = { 1, { 2, 3 } }; 1257/// 1258/// Because C is somewhat loose with braces, the AST does not necessarily 1259/// directly model the C source. Instead, the semantic analyzer aims to make 1260/// the InitListExprs match up with the type of the decl being initialized. We 1261/// have the following exceptions: 1262/// 1263/// 1. Elements at the end of the list may be dropped from the initializer. 1264/// These elements are defined to be initialized to zero. For example: 1265/// int x[20] = { 1 }; 1266/// 2. Initializers may have excess initializers which are to be ignored by the 1267/// compiler. For example: 1268/// int x[1] = { 1, 2 }; 1269/// 3. Redundant InitListExprs may be present around scalar elements. These 1270/// always have a single element whose type is the same as the InitListExpr. 1271/// this can only happen for Type::isScalarType() types. 1272/// int x = { 1 }; int y[2] = { {1}, {2} }; 1273/// 1274class InitListExpr : public Expr { 1275 Expr **InitExprs; 1276 unsigned NumInits; 1277 SourceLocation LBraceLoc, RBraceLoc; 1278public: 1279 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1280 SourceLocation rbraceloc); 1281 ~InitListExpr() { 1282 delete [] InitExprs; 1283 } 1284 1285 unsigned getNumInits() const { return NumInits; } 1286 1287 const Expr* getInit(unsigned Init) const { 1288 assert(Init < NumInits && "Initializer access out of range!"); 1289 return InitExprs[Init]; 1290 } 1291 1292 Expr* getInit(unsigned Init) { 1293 assert(Init < NumInits && "Initializer access out of range!"); 1294 return InitExprs[Init]; 1295 } 1296 1297 void setInit(unsigned Init, Expr *expr) { 1298 assert(Init < NumInits && "Initializer access out of range!"); 1299 InitExprs[Init] = expr; 1300 } 1301 1302 virtual SourceRange getSourceRange() const { 1303 return SourceRange(LBraceLoc, RBraceLoc); 1304 } 1305 static bool classof(const Stmt *T) { 1306 return T->getStmtClass() == InitListExprClass; 1307 } 1308 static bool classof(const InitListExpr *) { return true; } 1309 1310 // Iterators 1311 virtual child_iterator child_begin(); 1312 virtual child_iterator child_end(); 1313 1314 virtual void EmitImpl(llvm::Serializer& S) const; 1315 static InitListExpr* CreateImpl(llvm::Deserializer& D); 1316 1317private: 1318 // Used by serializer. 1319 InitListExpr() : Expr(InitListExprClass, QualType()), 1320 InitExprs(NULL), NumInits(0) {} 1321}; 1322 1323/// ObjCStringLiteral, used for Objective-C string literals 1324/// i.e. @"foo". 1325class ObjCStringLiteral : public Expr { 1326 StringLiteral *String; 1327 SourceLocation AtLoc; 1328public: 1329 ObjCStringLiteral(StringLiteral *SL, QualType T, SourceLocation L) 1330 : Expr(ObjCStringLiteralClass, T), String(SL), AtLoc(L) {} 1331 1332 StringLiteral* getString() { return String; } 1333 1334 const StringLiteral* getString() const { return String; } 1335 1336 SourceLocation getAtLoc() const { return AtLoc; } 1337 1338 virtual SourceRange getSourceRange() const { 1339 return SourceRange(AtLoc, String->getLocEnd()); 1340 } 1341 1342 static bool classof(const Stmt *T) { 1343 return T->getStmtClass() == ObjCStringLiteralClass; 1344 } 1345 static bool classof(const ObjCStringLiteral *) { return true; } 1346 1347 // Iterators 1348 virtual child_iterator child_begin(); 1349 virtual child_iterator child_end(); 1350 1351 virtual void EmitImpl(llvm::Serializer& S) const; 1352 static ObjCStringLiteral* CreateImpl(llvm::Deserializer& D); 1353}; 1354 1355/// ObjCEncodeExpr, used for @encode in Objective-C. 1356class ObjCEncodeExpr : public Expr { 1357 QualType EncType; 1358 SourceLocation AtLoc, RParenLoc; 1359public: 1360 ObjCEncodeExpr(QualType T, QualType ET, 1361 SourceLocation at, SourceLocation rp) 1362 : Expr(ObjCEncodeExprClass, T), EncType(ET), AtLoc(at), RParenLoc(rp) {} 1363 1364 SourceLocation getAtLoc() const { return AtLoc; } 1365 SourceLocation getRParenLoc() const { return RParenLoc; } 1366 1367 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1368 1369 QualType getEncodedType() const { return EncType; } 1370 1371 static bool classof(const Stmt *T) { 1372 return T->getStmtClass() == ObjCEncodeExprClass; 1373 } 1374 static bool classof(const ObjCEncodeExpr *) { return true; } 1375 1376 // Iterators 1377 virtual child_iterator child_begin(); 1378 virtual child_iterator child_end(); 1379 1380 virtual void EmitImpl(llvm::Serializer& S) const; 1381 static ObjCEncodeExpr* CreateImpl(llvm::Deserializer& D); 1382}; 1383 1384/// ObjCSelectorExpr used for @selector in Objective-C. 1385class ObjCSelectorExpr : public Expr { 1386 Selector SelName; 1387 SourceLocation AtLoc, RParenLoc; 1388public: 1389 ObjCSelectorExpr(QualType T, Selector selInfo, 1390 SourceLocation at, SourceLocation rp) 1391 : Expr(ObjCSelectorExprClass, T), SelName(selInfo), 1392 AtLoc(at), RParenLoc(rp) {} 1393 1394 const Selector &getSelector() const { return SelName; } 1395 Selector &getSelector() { return SelName; } 1396 1397 SourceLocation getAtLoc() const { return AtLoc; } 1398 SourceLocation getRParenLoc() const { return RParenLoc; } 1399 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1400 1401 /// getNumArgs - Return the number of actual arguments to this call. 1402 unsigned getNumArgs() const { return SelName.getNumArgs(); } 1403 1404 static bool classof(const Stmt *T) { 1405 return T->getStmtClass() == ObjCSelectorExprClass; 1406 } 1407 static bool classof(const ObjCSelectorExpr *) { return true; } 1408 1409 // Iterators 1410 virtual child_iterator child_begin(); 1411 virtual child_iterator child_end(); 1412 1413 virtual void EmitImpl(llvm::Serializer& S) const; 1414 static ObjCSelectorExpr* CreateImpl(llvm::Deserializer& D); 1415}; 1416 1417/// ObjCProtocolExpr used for protocol in Objective-C. 1418class ObjCProtocolExpr : public Expr { 1419 ObjCProtocolDecl *Protocol; 1420 SourceLocation AtLoc, RParenLoc; 1421public: 1422 ObjCProtocolExpr(QualType T, ObjCProtocolDecl *protocol, 1423 SourceLocation at, SourceLocation rp) 1424 : Expr(ObjCProtocolExprClass, T), Protocol(protocol), 1425 AtLoc(at), RParenLoc(rp) {} 1426 1427 ObjCProtocolDecl *getProtocol() const { return Protocol; } 1428 1429 SourceLocation getAtLoc() const { return AtLoc; } 1430 SourceLocation getRParenLoc() const { return RParenLoc; } 1431 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1432 1433 static bool classof(const Stmt *T) { 1434 return T->getStmtClass() == ObjCProtocolExprClass; 1435 } 1436 static bool classof(const ObjCProtocolExpr *) { return true; } 1437 1438 // Iterators 1439 virtual child_iterator child_begin(); 1440 virtual child_iterator child_end(); 1441}; 1442 1443/// ObjCIvarRefExpr - A reference to an ObjC instance variable. 1444class ObjCIvarRefExpr : public Expr { 1445 class ObjCIvarDecl *D; 1446 SourceLocation Loc; 1447 Expr *Base; 1448 bool IsArrow:1; // True if this is "X->F", false if this is "X.F". 1449 bool IsFreeIvar:1; // True if ivar reference has no base (self assumed). 1450 1451public: 1452 ObjCIvarRefExpr(ObjCIvarDecl *d, QualType t, SourceLocation l, Expr *base=0, 1453 bool arrow = false, bool freeIvar = false) : 1454 Expr(ObjCIvarRefExprClass, t), D(d), Loc(l), Base(base), IsArrow(arrow), 1455 IsFreeIvar(freeIvar) {} 1456 1457 ObjCIvarDecl *getDecl() { return D; } 1458 const ObjCIvarDecl *getDecl() const { return D; } 1459 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 1460 Expr *const getBase() const { return Base; } 1461 void setBase(Expr * base) { Base = base; } 1462 const bool isArrow() const { return IsArrow; } 1463 const bool isFreeIvar() const { return IsFreeIvar; } 1464 1465 SourceLocation getLocation() const { return Loc; } 1466 1467 static bool classof(const Stmt *T) { 1468 return T->getStmtClass() == ObjCIvarRefExprClass; 1469 } 1470 static bool classof(const ObjCIvarRefExpr *) { return true; } 1471 1472 // Iterators 1473 virtual child_iterator child_begin(); 1474 virtual child_iterator child_end(); 1475 1476 virtual void EmitImpl(llvm::Serializer& S) const; 1477 static ObjCIvarRefExpr* CreateImpl(llvm::Deserializer& D); 1478}; 1479 1480class ObjCMessageExpr : public Expr { 1481 enum { RECEIVER=0, ARGS_START=1 }; 1482 1483 Expr **SubExprs; 1484 1485 unsigned NumArgs; 1486 1487 // A unigue name for this message. 1488 Selector SelName; 1489 1490 // A method prototype for this message (optional). 1491 // FIXME: Since method decls contain the selector, and most messages have a 1492 // prototype, consider devising a scheme for unifying SelName/MethodProto. 1493 ObjCMethodDecl *MethodProto; 1494 1495 IdentifierInfo *ClassName; // optional - 0 for instance messages. 1496 1497 SourceLocation LBracloc, RBracloc; 1498public: 1499 // constructor for class messages. 1500 // FIXME: clsName should be typed to ObjCInterfaceType 1501 ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1502 QualType retType, ObjCMethodDecl *methDecl, 1503 SourceLocation LBrac, SourceLocation RBrac, 1504 Expr **ArgExprs, unsigned NumArgs); 1505 // constructor for instance messages. 1506 ObjCMessageExpr(Expr *receiver, Selector selInfo, 1507 QualType retType, ObjCMethodDecl *methDecl, 1508 SourceLocation LBrac, SourceLocation RBrac, 1509 Expr **ArgExprs, unsigned NumArgs); 1510 ~ObjCMessageExpr() { 1511 delete [] SubExprs; 1512 } 1513 1514 const Expr *getReceiver() const { return SubExprs[RECEIVER]; } 1515 Expr *getReceiver() { return SubExprs[RECEIVER]; } 1516 1517 const Selector &getSelector() const { return SelName; } 1518 Selector &getSelector() { return SelName; } 1519 1520 const ObjCMethodDecl *getMethodDecl() const { return MethodProto; } 1521 ObjCMethodDecl *getMethodDecl() { return MethodProto; } 1522 1523 const IdentifierInfo *getClassName() const { return ClassName; } 1524 IdentifierInfo *getClassName() { return ClassName; } 1525 1526 /// getNumArgs - Return the number of actual arguments to this call. 1527 unsigned getNumArgs() const { return NumArgs; } 1528 1529/// getArg - Return the specified argument. 1530 Expr *getArg(unsigned Arg) { 1531 assert(Arg < NumArgs && "Arg access out of range!"); 1532 return SubExprs[Arg+ARGS_START]; 1533 } 1534 const Expr *getArg(unsigned Arg) const { 1535 assert(Arg < NumArgs && "Arg access out of range!"); 1536 return SubExprs[Arg+ARGS_START]; 1537 } 1538 /// setArg - Set the specified argument. 1539 void setArg(unsigned Arg, Expr *ArgExpr) { 1540 assert(Arg < NumArgs && "Arg access out of range!"); 1541 SubExprs[Arg+ARGS_START] = ArgExpr; 1542 } 1543 SourceRange getSourceRange() const { return SourceRange(LBracloc, RBracloc); } 1544 1545 static bool classof(const Stmt *T) { 1546 return T->getStmtClass() == ObjCMessageExprClass; 1547 } 1548 static bool classof(const ObjCMessageExpr *) { return true; } 1549 1550 // Iterators 1551 virtual child_iterator child_begin(); 1552 virtual child_iterator child_end(); 1553}; 1554 1555} // end namespace clang 1556 1557#endif 1558