Expr.h revision 27437caadea35f84d550cd29f024fcf3ea240eec
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source 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/Basic/IdentifierTable.h" 21#include "llvm/ADT/APSInt.h" 22#include "llvm/ADT/APFloat.h" 23 24namespace clang { 25 class IdentifierInfo; 26 class Selector; 27 class Decl; 28 class ASTContext; 29 30/// Expr - This represents one expression. Note that Expr's are subclasses of 31/// Stmt. This allows an expression to be transparently used any place a Stmt 32/// is required. 33/// 34class Expr : public Stmt { 35 QualType TR; 36protected: 37 Expr(StmtClass SC, QualType T) : Stmt(SC), TR(T) {} 38public: 39 QualType getType() const { return TR; } 40 void setType(QualType t) { TR = t; } 41 42 /// SourceLocation tokens are not useful in isolation - they are low level 43 /// value objects created/interpreted by SourceManager. We assume AST 44 /// clients will have a pointer to the respective SourceManager. 45 virtual SourceRange getSourceRange() const = 0; 46 47 /// getExprLoc - Return the preferred location for the arrow when diagnosing 48 /// a problem with a generic expression. 49 virtual SourceLocation getExprLoc() const { return getLocStart(); } 50 51 /// hasLocalSideEffect - Return true if this immediate expression has side 52 /// effects, not counting any sub-expressions. 53 bool hasLocalSideEffect() const; 54 55 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 56 /// incomplete type other than void. Nonarray expressions that can be lvalues: 57 /// - name, where name must be a variable 58 /// - e[i] 59 /// - (e), where e must be an lvalue 60 /// - e.name, where e must be an lvalue 61 /// - e->name 62 /// - *e, the type of e cannot be a function type 63 /// - string-constant 64 /// - reference type [C++ [expr]] 65 /// 66 enum isLvalueResult { 67 LV_Valid, 68 LV_NotObjectType, 69 LV_IncompleteVoidType, 70 LV_DuplicateVectorComponents, 71 LV_InvalidExpression 72 }; 73 isLvalueResult isLvalue() const; 74 75 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 76 /// does not have an incomplete type, does not have a const-qualified type, 77 /// and if it is a structure or union, does not have any member (including, 78 /// recursively, any member or element of all contained aggregates or unions) 79 /// with a const-qualified type. 80 enum isModifiableLvalueResult { 81 MLV_Valid, 82 MLV_NotObjectType, 83 MLV_IncompleteVoidType, 84 MLV_DuplicateVectorComponents, 85 MLV_InvalidExpression, 86 MLV_IncompleteType, 87 MLV_ConstQualified, 88 MLV_ArrayType 89 }; 90 isModifiableLvalueResult isModifiableLvalue() const; 91 92 bool isNullPointerConstant(ASTContext &Ctx) const; 93 94 /// isIntegerConstantExpr - Return true if this expression is a valid integer 95 /// constant expression, and, if so, return its value in Result. If not a 96 /// valid i-c-e, return false and fill in Loc (if specified) with the location 97 /// of the invalid expression. 98 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 99 SourceLocation *Loc = 0, 100 bool isEvaluated = true) const; 101 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 102 llvm::APSInt X(32); 103 return isIntegerConstantExpr(X, Ctx, Loc); 104 } 105 /// isConstantExpr - Return true if this expression is a valid constant expr. 106 bool isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const; 107 108 static bool classof(const Stmt *T) { 109 return T->getStmtClass() >= firstExprConstant && 110 T->getStmtClass() <= lastExprConstant; 111 } 112 static bool classof(const Expr *) { return true; } 113}; 114 115//===----------------------------------------------------------------------===// 116// Primary Expressions. 117//===----------------------------------------------------------------------===// 118 119/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 120/// enum, etc. 121class DeclRefExpr : public Expr { 122 ValueDecl *D; 123 SourceLocation Loc; 124public: 125 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 126 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 127 128 ValueDecl *getDecl() { return D; } 129 const ValueDecl *getDecl() const { return D; } 130 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 131 132 133 static bool classof(const Stmt *T) { 134 return T->getStmtClass() == DeclRefExprClass; 135 } 136 static bool classof(const DeclRefExpr *) { return true; } 137 138 // Iterators 139 virtual child_iterator child_begin(); 140 virtual child_iterator child_end(); 141}; 142 143/// PreDefinedExpr - [C99 6.4.2.2] - A pre-defined identifier such as __func__. 144class PreDefinedExpr : public Expr { 145public: 146 enum IdentType { 147 Func, 148 Function, 149 PrettyFunction 150 }; 151 152private: 153 SourceLocation Loc; 154 IdentType Type; 155public: 156 PreDefinedExpr(SourceLocation l, QualType type, IdentType IT) 157 : Expr(PreDefinedExprClass, type), Loc(l), Type(IT) {} 158 159 IdentType getIdentType() const { return Type; } 160 161 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 162 163 static bool classof(const Stmt *T) { 164 return T->getStmtClass() == PreDefinedExprClass; 165 } 166 static bool classof(const PreDefinedExpr *) { return true; } 167 168 // Iterators 169 virtual child_iterator child_begin(); 170 virtual child_iterator child_end(); 171}; 172 173class IntegerLiteral : public Expr { 174 llvm::APInt Value; 175 SourceLocation Loc; 176public: 177 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 178 // or UnsignedLongLongTy 179 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 180 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 181 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 182 } 183 const llvm::APInt &getValue() const { return Value; } 184 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 185 186 static bool classof(const Stmt *T) { 187 return T->getStmtClass() == IntegerLiteralClass; 188 } 189 static bool classof(const IntegerLiteral *) { return true; } 190 191 // Iterators 192 virtual child_iterator child_begin(); 193 virtual child_iterator child_end(); 194}; 195 196class CharacterLiteral : public Expr { 197 unsigned Value; 198 SourceLocation Loc; 199public: 200 // type should be IntTy 201 CharacterLiteral(unsigned value, QualType type, SourceLocation l) 202 : Expr(CharacterLiteralClass, type), Value(value), Loc(l) { 203 } 204 SourceLocation getLoc() const { return Loc; } 205 206 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 207 208 unsigned getValue() const { return Value; } 209 210 static bool classof(const Stmt *T) { 211 return T->getStmtClass() == CharacterLiteralClass; 212 } 213 static bool classof(const CharacterLiteral *) { return true; } 214 215 // Iterators 216 virtual child_iterator child_begin(); 217 virtual child_iterator child_end(); 218}; 219 220class FloatingLiteral : public Expr { 221 llvm::APFloat Value; 222 SourceLocation Loc; 223public: 224 FloatingLiteral(const llvm::APFloat &V, QualType Type, SourceLocation L) 225 : Expr(FloatingLiteralClass, Type), Value(V), Loc(L) {} 226 227 const llvm::APFloat &getValue() const { return Value; } 228 229 /// getValueAsDouble - This returns the value as an inaccurate double. Note 230 /// that this may cause loss of precision, but is useful for debugging dumps 231 /// etc. 232 double getValueAsDouble() const { 233 // FIXME: We need something for long double here. 234 if (cast<BuiltinType>(getType())->getKind() == BuiltinType::Float) 235 return Value.convertToFloat(); 236 else 237 return Value.convertToDouble(); 238 } 239 240 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 241 242 static bool classof(const Stmt *T) { 243 return T->getStmtClass() == FloatingLiteralClass; 244 } 245 static bool classof(const FloatingLiteral *) { return true; } 246 247 // Iterators 248 virtual child_iterator child_begin(); 249 virtual child_iterator child_end(); 250}; 251 252/// ImaginaryLiteral - We support imaginary integer and floating point literals, 253/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 254/// IntegerLiteral classes. Instances of this class always have a Complex type 255/// whose element type matches the subexpression. 256/// 257class ImaginaryLiteral : public Expr { 258 Expr *Val; 259public: 260 ImaginaryLiteral(Expr *val, QualType Ty) 261 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 262 263 const Expr *getSubExpr() const { return Val; } 264 Expr *getSubExpr() { return Val; } 265 266 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 267 static bool classof(const Stmt *T) { 268 return T->getStmtClass() == ImaginaryLiteralClass; 269 } 270 static bool classof(const ImaginaryLiteral *) { return true; } 271 272 // Iterators 273 virtual child_iterator child_begin(); 274 virtual child_iterator child_end(); 275}; 276 277/// StringLiteral - This represents a string literal expression, e.g. "foo" 278/// or L"bar" (wide strings). The actual string is returned by getStrData() 279/// is NOT null-terminated, and the length of the string is determined by 280/// calling getByteLength(). 281class StringLiteral : public Expr { 282 const char *StrData; 283 unsigned ByteLength; 284 bool IsWide; 285 // if the StringLiteral was composed using token pasting, both locations 286 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 287 // FIXME: if space becomes an issue, we should create a sub-class. 288 SourceLocation firstTokLoc, lastTokLoc; 289public: 290 StringLiteral(const char *strData, unsigned byteLength, bool Wide, 291 QualType t, SourceLocation b, SourceLocation e); 292 virtual ~StringLiteral(); 293 294 const char *getStrData() const { return StrData; } 295 unsigned getByteLength() const { return ByteLength; } 296 bool isWide() const { return IsWide; } 297 298 virtual SourceRange getSourceRange() const { 299 return SourceRange(firstTokLoc,lastTokLoc); 300 } 301 static bool classof(const Stmt *T) { 302 return T->getStmtClass() == StringLiteralClass; 303 } 304 static bool classof(const StringLiteral *) { return true; } 305 306 // Iterators 307 virtual child_iterator child_begin(); 308 virtual child_iterator child_end(); 309}; 310 311/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 312/// AST node is only formed if full location information is requested. 313class ParenExpr : public Expr { 314 SourceLocation L, R; 315 Expr *Val; 316public: 317 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 318 : Expr(ParenExprClass, val->getType()), L(l), R(r), Val(val) {} 319 320 const Expr *getSubExpr() const { return Val; } 321 Expr *getSubExpr() { return Val; } 322 SourceRange getSourceRange() const { return SourceRange(L, R); } 323 324 static bool classof(const Stmt *T) { 325 return T->getStmtClass() == ParenExprClass; 326 } 327 static bool classof(const ParenExpr *) { return true; } 328 329 // Iterators 330 virtual child_iterator child_begin(); 331 virtual child_iterator child_end(); 332}; 333 334 335/// UnaryOperator - This represents the unary-expression's (except sizeof of 336/// types), the postinc/postdec operators from postfix-expression, and various 337/// extensions. 338/// 339/// Notes on various nodes: 340/// 341/// Real/Imag - These return the real/imag part of a complex operand. If 342/// applied to a non-complex value, the former returns its operand and the 343/// later returns zero in the type of the operand. 344/// 345/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 346/// subexpression is a compound literal with the various MemberExpr and 347/// ArraySubscriptExpr's applied to it. 348/// 349class UnaryOperator : public Expr { 350public: 351 // Note that additions to this should also update the StmtVisitor class. 352 enum Opcode { 353 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 354 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 355 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 356 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 357 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 358 SizeOf, AlignOf, // [C99 6.5.3.4] Sizeof (expr, not type) operator. 359 Real, Imag, // "__real expr"/"__imag expr" Extension. 360 Extension, // __extension__ marker. 361 OffsetOf // __builtin_offsetof 362 }; 363private: 364 Expr *Val; 365 Opcode Opc; 366 SourceLocation Loc; 367public: 368 369 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 370 : Expr(UnaryOperatorClass, type), Val(input), Opc(opc), Loc(l) {} 371 372 Opcode getOpcode() const { return Opc; } 373 Expr *getSubExpr() const { return Val; } 374 375 /// getOperatorLoc - Return the location of the operator. 376 SourceLocation getOperatorLoc() const { return Loc; } 377 378 /// isPostfix - Return true if this is a postfix operation, like x++. 379 static bool isPostfix(Opcode Op); 380 381 bool isPostfix() const { return isPostfix(Opc); } 382 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 383 bool isSizeOfAlignOfOp() const { return Opc == SizeOf || Opc == AlignOf; } 384 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 385 386 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 387 /// corresponds to, e.g. "sizeof" or "[pre]++" 388 static const char *getOpcodeStr(Opcode Op); 389 390 virtual SourceRange getSourceRange() const { 391 if (isPostfix()) 392 return SourceRange(Val->getLocStart(), Loc); 393 else 394 return SourceRange(Loc, Val->getLocEnd()); 395 } 396 virtual SourceLocation getExprLoc() const { return Loc; } 397 398 static bool classof(const Stmt *T) { 399 return T->getStmtClass() == UnaryOperatorClass; 400 } 401 static bool classof(const UnaryOperator *) { return true; } 402 403 // Iterators 404 virtual child_iterator child_begin(); 405 virtual child_iterator child_end(); 406}; 407 408/// SizeOfAlignOfTypeExpr - [C99 6.5.3.4] - This is only for sizeof/alignof of 409/// *types*. sizeof(expr) is handled by UnaryOperator. 410class SizeOfAlignOfTypeExpr : public Expr { 411 bool isSizeof; // true if sizeof, false if alignof. 412 QualType Ty; 413 SourceLocation OpLoc, RParenLoc; 414public: 415 SizeOfAlignOfTypeExpr(bool issizeof, QualType argType, QualType resultType, 416 SourceLocation op, SourceLocation rp) : 417 Expr(SizeOfAlignOfTypeExprClass, resultType), 418 isSizeof(issizeof), Ty(argType), OpLoc(op), RParenLoc(rp) {} 419 420 bool isSizeOf() const { return isSizeof; } 421 QualType getArgumentType() const { return Ty; } 422 423 SourceLocation getOperatorLoc() const { return OpLoc; } 424 SourceRange getSourceRange() const { return SourceRange(OpLoc, RParenLoc); } 425 426 static bool classof(const Stmt *T) { 427 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 428 } 429 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 430 431 // Iterators 432 virtual child_iterator child_begin(); 433 virtual child_iterator child_end(); 434}; 435 436//===----------------------------------------------------------------------===// 437// Postfix Operators. 438//===----------------------------------------------------------------------===// 439 440/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 441class ArraySubscriptExpr : public Expr { 442 enum { LHS, RHS, END_EXPR=2 }; 443 Expr* SubExprs[END_EXPR]; 444 SourceLocation RBracketLoc; 445public: 446 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 447 SourceLocation rbracketloc) 448 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 449 SubExprs[LHS] = lhs; 450 SubExprs[RHS] = rhs; 451 } 452 453 /// An array access can be written A[4] or 4[A] (both are equivalent). 454 /// - getBase() and getIdx() always present the normalized view: A[4]. 455 /// In this case getBase() returns "A" and getIdx() returns "4". 456 /// - getLHS() and getRHS() present the syntactic view. e.g. for 457 /// 4[A] getLHS() returns "4". 458 459 Expr *getLHS() { return SubExprs[LHS]; } 460 const Expr *getLHS() const { return SubExprs[LHS]; } 461 462 Expr *getRHS() { return SubExprs[RHS]; } 463 const Expr *getRHS() const { return SubExprs[RHS]; } 464 465 Expr *getBase() { 466 return (getLHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 467 } 468 469 const Expr *getBase() const { 470 return (getLHS()->getType()->isIntegerType()) ? getRHS() : getLHS(); 471 } 472 473 Expr *getIdx() { 474 return (getLHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 475 } 476 477 const Expr *getIdx() const { 478 return (getLHS()->getType()->isIntegerType()) ? getLHS() : getRHS(); 479 } 480 481 482 SourceRange getSourceRange() const { 483 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 484 } 485 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 486 487 static bool classof(const Stmt *T) { 488 return T->getStmtClass() == ArraySubscriptExprClass; 489 } 490 static bool classof(const ArraySubscriptExpr *) { return true; } 491 492 // Iterators 493 virtual child_iterator child_begin(); 494 virtual child_iterator child_end(); 495}; 496 497 498/// CallExpr - [C99 6.5.2.2] Function Calls. 499/// 500class CallExpr : public Expr { 501 enum { FN=0, ARGS_START=1 }; 502 Expr **SubExprs; 503 unsigned NumArgs; 504 SourceLocation RParenLoc; 505public: 506 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 507 SourceLocation rparenloc); 508 ~CallExpr() { 509 delete [] SubExprs; 510 } 511 512 const Expr *getCallee() const { return SubExprs[FN]; } 513 Expr *getCallee() { return SubExprs[FN]; } 514 515 /// getNumArgs - Return the number of actual arguments to this call. 516 /// 517 unsigned getNumArgs() const { return NumArgs; } 518 519 /// getArg - Return the specified argument. 520 Expr *getArg(unsigned Arg) { 521 assert(Arg < NumArgs && "Arg access out of range!"); 522 return SubExprs[Arg+ARGS_START]; 523 } 524 const Expr *getArg(unsigned Arg) const { 525 assert(Arg < NumArgs && "Arg access out of range!"); 526 return SubExprs[Arg+ARGS_START]; 527 } 528 /// setArg - Set the specified argument. 529 void setArg(unsigned Arg, Expr *ArgExpr) { 530 assert(Arg < NumArgs && "Arg access out of range!"); 531 SubExprs[Arg+ARGS_START] = ArgExpr; 532 } 533 /// getNumCommas - Return the number of commas that must have been present in 534 /// this function call. 535 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 536 537 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 538 539 SourceRange getSourceRange() const { 540 return SourceRange(getCallee()->getLocStart(), RParenLoc); 541 } 542 543 static bool classof(const Stmt *T) { 544 return T->getStmtClass() == CallExprClass; 545 } 546 static bool classof(const CallExpr *) { return true; } 547 548 // Iterators 549 virtual child_iterator child_begin(); 550 virtual child_iterator child_end(); 551}; 552 553/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 554/// 555class MemberExpr : public Expr { 556 Expr *Base; 557 FieldDecl *MemberDecl; 558 SourceLocation MemberLoc; 559 bool IsArrow; // True if this is "X->F", false if this is "X.F". 560public: 561 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l) 562 : Expr(MemberExprClass, memberdecl->getType()), 563 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 564 565 Expr *getBase() const { return Base; } 566 FieldDecl *getMemberDecl() const { return MemberDecl; } 567 bool isArrow() const { return IsArrow; } 568 569 virtual SourceRange getSourceRange() const { 570 return SourceRange(getBase()->getLocStart(), MemberLoc); 571 } 572 virtual SourceLocation getExprLoc() const { return MemberLoc; } 573 574 static bool classof(const Stmt *T) { 575 return T->getStmtClass() == MemberExprClass; 576 } 577 static bool classof(const MemberExpr *) { return true; } 578 579 // Iterators 580 virtual child_iterator child_begin(); 581 virtual child_iterator child_end(); 582}; 583 584/// OCUVectorElementExpr - This represents access to specific elements of a 585/// vector, and may occur on the left hand side or right hand side. For example 586/// the following is legal: "V.xy = V.zw" if V is a 4 element ocu vector. 587/// 588class OCUVectorElementExpr : public Expr { 589 Expr *Base; 590 IdentifierInfo &Accessor; 591 SourceLocation AccessorLoc; 592public: 593 enum ElementType { 594 Point, // xywz 595 Color, // rgba 596 Texture // stpq 597 }; 598 OCUVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 599 SourceLocation loc) 600 : Expr(OCUVectorElementExprClass, ty), 601 Base(base), Accessor(accessor), AccessorLoc(loc) {} 602 603 const Expr *getBase() const { return Base; } 604 Expr *getBase() { return Base; } 605 606 IdentifierInfo &getAccessor() const { return Accessor; } 607 608 /// getNumElements - Get the number of components being selected. 609 unsigned getNumElements() const; 610 611 /// getElementType - Determine whether the components of this access are 612 /// "point" "color" or "texture" elements. 613 ElementType getElementType() const; 614 615 /// containsDuplicateElements - Return true if any element access is 616 /// repeated. 617 bool containsDuplicateElements() const; 618 619 /// getEncodedElementAccess - Encode the elements accessed into a bit vector. 620 /// The encoding currently uses 2-bit bitfields, but clients should use the 621 /// accessors below to access them. 622 /// 623 unsigned getEncodedElementAccess() const; 624 625 /// getAccessedFieldNo - Given an encoded value and a result number, return 626 /// the input field number being accessed. 627 static unsigned getAccessedFieldNo(unsigned Idx, unsigned EncodedVal) { 628 return (EncodedVal >> (Idx*2)) & 3; 629 } 630 631 virtual SourceRange getSourceRange() const { 632 return SourceRange(getBase()->getLocStart(), AccessorLoc); 633 } 634 static bool classof(const Stmt *T) { 635 return T->getStmtClass() == OCUVectorElementExprClass; 636 } 637 static bool classof(const OCUVectorElementExpr *) { return true; } 638 639 // Iterators 640 virtual child_iterator child_begin(); 641 virtual child_iterator child_end(); 642}; 643 644/// CompoundLiteralExpr - [C99 6.5.2.5] 645/// 646class CompoundLiteralExpr : public Expr { 647 Expr *Init; 648public: 649 CompoundLiteralExpr(QualType ty, Expr *init) : 650 Expr(CompoundLiteralExprClass, ty), Init(init) {} 651 652 const Expr *getInitializer() const { return Init; } 653 Expr *getInitializer() { return Init; } 654 655 virtual SourceRange getSourceRange() const { 656 if (Init) 657 return Init->getSourceRange(); 658 return SourceRange(); 659 } 660 661 static bool classof(const Stmt *T) { 662 return T->getStmtClass() == CompoundLiteralExprClass; 663 } 664 static bool classof(const CompoundLiteralExpr *) { return true; } 665 666 // Iterators 667 virtual child_iterator child_begin(); 668 virtual child_iterator child_end(); 669}; 670 671/// ImplicitCastExpr - Allows us to explicitly represent implicit type 672/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 673/// float->double, short->int, etc. 674/// 675class ImplicitCastExpr : public Expr { 676 Expr *Op; 677public: 678 ImplicitCastExpr(QualType ty, Expr *op) : 679 Expr(ImplicitCastExprClass, ty), Op(op) {} 680 681 Expr *getSubExpr() { return Op; } 682 const Expr *getSubExpr() const { return Op; } 683 684 virtual SourceRange getSourceRange() const { return Op->getSourceRange(); } 685 686 static bool classof(const Stmt *T) { 687 return T->getStmtClass() == ImplicitCastExprClass; 688 } 689 static bool classof(const ImplicitCastExpr *) { return true; } 690 691 // Iterators 692 virtual child_iterator child_begin(); 693 virtual child_iterator child_end(); 694}; 695 696/// CastExpr - [C99 6.5.4] Cast Operators. 697/// 698class CastExpr : public Expr { 699 Expr *Op; 700 SourceLocation Loc; // the location of the left paren 701public: 702 CastExpr(QualType ty, Expr *op, SourceLocation l) : 703 Expr(CastExprClass, ty), Op(op), Loc(l) {} 704 705 SourceLocation getLParenLoc() const { return Loc; } 706 707 Expr *getSubExpr() const { return Op; } 708 709 virtual SourceRange getSourceRange() const { 710 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 711 } 712 static bool classof(const Stmt *T) { 713 return T->getStmtClass() == CastExprClass; 714 } 715 static bool classof(const CastExpr *) { return true; } 716 717 // Iterators 718 virtual child_iterator child_begin(); 719 virtual child_iterator child_end(); 720}; 721 722class BinaryOperator : public Expr { 723public: 724 enum Opcode { 725 // Operators listed in order of precedence. 726 // Note that additions to this should also update the StmtVisitor class. 727 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 728 Add, Sub, // [C99 6.5.6] Additive operators. 729 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 730 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 731 EQ, NE, // [C99 6.5.9] Equality operators. 732 And, // [C99 6.5.10] Bitwise AND operator. 733 Xor, // [C99 6.5.11] Bitwise XOR operator. 734 Or, // [C99 6.5.12] Bitwise OR operator. 735 LAnd, // [C99 6.5.13] Logical AND operator. 736 LOr, // [C99 6.5.14] Logical OR operator. 737 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 738 DivAssign, RemAssign, 739 AddAssign, SubAssign, 740 ShlAssign, ShrAssign, 741 AndAssign, XorAssign, 742 OrAssign, 743 Comma // [C99 6.5.17] Comma operator. 744 }; 745private: 746 enum { LHS, RHS, END_EXPR }; 747 Expr* SubExprs[END_EXPR]; 748 Opcode Opc; 749 SourceLocation OpLoc; 750public: 751 752 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 753 SourceLocation opLoc) 754 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 755 SubExprs[LHS] = lhs; 756 SubExprs[RHS] = rhs; 757 assert(!isCompoundAssignmentOp() && 758 "Use ArithAssignBinaryOperator for compound assignments"); 759 } 760 761 SourceLocation getOperatorLoc() const { return OpLoc; } 762 Opcode getOpcode() const { return Opc; } 763 Expr *getLHS() const { return SubExprs[LHS]; } 764 Expr *getRHS() const { return SubExprs[RHS]; } 765 virtual SourceRange getSourceRange() const { 766 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 767 } 768 769 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 770 /// corresponds to, e.g. "<<=". 771 static const char *getOpcodeStr(Opcode Op); 772 773 /// predicates to categorize the respective opcodes. 774 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 775 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 776 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 777 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 778 bool isRelationalOp() const { return Opc >= LT && Opc <= GE; } 779 bool isEqualityOp() const { return Opc == EQ || Opc == NE; } 780 bool isLogicalOp() const { return Opc == LAnd || Opc == LOr; } 781 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 782 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 783 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 784 785 static bool classof(const Stmt *S) { 786 return S->getStmtClass() == BinaryOperatorClass || 787 S->getStmtClass() == CompoundAssignOperatorClass; 788 } 789 static bool classof(const BinaryOperator *) { return true; } 790 791 // Iterators 792 virtual child_iterator child_begin(); 793 virtual child_iterator child_end(); 794 795protected: 796 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 797 SourceLocation oploc, bool dead) 798 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 799 SubExprs[LHS] = lhs; 800 SubExprs[RHS] = rhs; 801 } 802}; 803 804/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 805/// track of the type the operation is performed in. Due to the semantics of 806/// these operators, the operands are promoted, the aritmetic performed, an 807/// implicit conversion back to the result type done, then the assignment takes 808/// place. This captures the intermediate type which the computation is done 809/// in. 810class CompoundAssignOperator : public BinaryOperator { 811 QualType ComputationType; 812public: 813 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 814 QualType ResType, QualType CompType, 815 SourceLocation OpLoc) 816 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 817 ComputationType(CompType) { 818 assert(isCompoundAssignmentOp() && 819 "Only should be used for compound assignments"); 820 } 821 822 QualType getComputationType() const { return ComputationType; } 823 824 static bool classof(const CompoundAssignOperator *) { return true; } 825 static bool classof(const Stmt *S) { 826 return S->getStmtClass() == CompoundAssignOperatorClass; 827 } 828}; 829 830/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 831/// GNU "missing LHS" extension is in use. 832/// 833class ConditionalOperator : public Expr { 834 enum { COND, LHS, RHS, END_EXPR }; 835 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 836public: 837 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 838 : Expr(ConditionalOperatorClass, t) { 839 SubExprs[COND] = cond; 840 SubExprs[LHS] = lhs; 841 SubExprs[RHS] = rhs; 842 } 843 844 Expr *getCond() const { return SubExprs[COND]; } 845 Expr *getLHS() const { return SubExprs[LHS]; } 846 Expr *getRHS() const { return SubExprs[RHS]; } 847 848 virtual SourceRange getSourceRange() const { 849 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 850 } 851 static bool classof(const Stmt *T) { 852 return T->getStmtClass() == ConditionalOperatorClass; 853 } 854 static bool classof(const ConditionalOperator *) { return true; } 855 856 // Iterators 857 virtual child_iterator child_begin(); 858 virtual child_iterator child_end(); 859}; 860 861/// AddrLabelExpr - The GNU address of label extension, representing &&label. 862class AddrLabelExpr : public Expr { 863 SourceLocation AmpAmpLoc, LabelLoc; 864 LabelStmt *Label; 865public: 866 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 867 QualType t) 868 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 869 870 virtual SourceRange getSourceRange() const { 871 return SourceRange(AmpAmpLoc, LabelLoc); 872 } 873 874 LabelStmt *getLabel() const { return Label; } 875 876 static bool classof(const Stmt *T) { 877 return T->getStmtClass() == AddrLabelExprClass; 878 } 879 static bool classof(const AddrLabelExpr *) { return true; } 880 881 // Iterators 882 virtual child_iterator child_begin(); 883 virtual child_iterator child_end(); 884}; 885 886/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 887/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 888/// takes the value of the last subexpression. 889class StmtExpr : public Expr { 890 CompoundStmt *SubStmt; 891 SourceLocation LParenLoc, RParenLoc; 892public: 893 StmtExpr(CompoundStmt *substmt, QualType T, 894 SourceLocation lp, SourceLocation rp) : 895 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 896 897 CompoundStmt *getSubStmt() { return SubStmt; } 898 const CompoundStmt *getSubStmt() const { return SubStmt; } 899 900 virtual SourceRange getSourceRange() const { 901 return SourceRange(LParenLoc, RParenLoc); 902 } 903 904 static bool classof(const Stmt *T) { 905 return T->getStmtClass() == StmtExprClass; 906 } 907 static bool classof(const StmtExpr *) { return true; } 908 909 // Iterators 910 virtual child_iterator child_begin(); 911 virtual child_iterator child_end(); 912}; 913 914/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 915/// This AST node represents a function that returns 1 if two *types* (not 916/// expressions) are compatible. The result of this built-in function can be 917/// used in integer constant expressions. 918class TypesCompatibleExpr : public Expr { 919 QualType Type1; 920 QualType Type2; 921 SourceLocation BuiltinLoc, RParenLoc; 922public: 923 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 924 QualType t1, QualType t2, SourceLocation RP) : 925 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 926 BuiltinLoc(BLoc), RParenLoc(RP) {} 927 928 QualType getArgType1() const { return Type1; } 929 QualType getArgType2() const { return Type2; } 930 931 virtual SourceRange getSourceRange() const { 932 return SourceRange(BuiltinLoc, RParenLoc); 933 } 934 static bool classof(const Stmt *T) { 935 return T->getStmtClass() == TypesCompatibleExprClass; 936 } 937 static bool classof(const TypesCompatibleExpr *) { return true; } 938 939 // Iterators 940 virtual child_iterator child_begin(); 941 virtual child_iterator child_end(); 942}; 943 944/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 945/// This AST node is similar to the conditional operator (?:) in C, with 946/// the following exceptions: 947/// - the test expression much be a constant expression. 948/// - the expression returned has it's type unaltered by promotion rules. 949/// - does not evaluate the expression that was not chosen. 950class ChooseExpr : public Expr { 951 enum { COND, LHS, RHS, END_EXPR }; 952 Expr* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 953 SourceLocation BuiltinLoc, RParenLoc; 954public: 955 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 956 SourceLocation RP) 957 : Expr(ChooseExprClass, t), 958 BuiltinLoc(BLoc), RParenLoc(RP) { 959 SubExprs[COND] = cond; 960 SubExprs[LHS] = lhs; 961 SubExprs[RHS] = rhs; 962 } 963 964 /// isConditionTrue - Return true if the condition is true. This is always 965 /// statically knowable for a well-formed choosexpr. 966 bool isConditionTrue(ASTContext &C) const; 967 968 Expr *getCond() const { return SubExprs[COND]; } 969 Expr *getLHS() const { return SubExprs[LHS]; } 970 Expr *getRHS() const { return SubExprs[RHS]; } 971 972 virtual SourceRange getSourceRange() const { 973 return SourceRange(BuiltinLoc, RParenLoc); 974 } 975 static bool classof(const Stmt *T) { 976 return T->getStmtClass() == ChooseExprClass; 977 } 978 static bool classof(const ChooseExpr *) { return true; } 979 980 // Iterators 981 virtual child_iterator child_begin(); 982 virtual child_iterator child_end(); 983}; 984 985/// VAArgExpr, used for the builtin function __builtin_va_start. 986class VAArgExpr : public Expr { 987 Expr *Val; 988 SourceLocation BuiltinLoc, RParenLoc; 989public: 990 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 991 : Expr(VAArgExprClass, t), 992 Val(e), 993 BuiltinLoc(BLoc), 994 RParenLoc(RPLoc) { } 995 996 const Expr *getSubExpr() const { return Val; } 997 Expr *getSubExpr() { return Val; } 998 virtual SourceRange getSourceRange() const { 999 return SourceRange(BuiltinLoc, RParenLoc); 1000 } 1001 static bool classof(const Stmt *T) { 1002 return T->getStmtClass() == VAArgExprClass; 1003 } 1004 static bool classof(const VAArgExpr *) { return true; } 1005 1006 // Iterators 1007 virtual child_iterator child_begin(); 1008 virtual child_iterator child_end(); 1009}; 1010 1011/// InitListExpr, used for struct and array initializers. 1012class InitListExpr : public Expr { 1013 Expr **InitExprs; 1014 unsigned NumInits; 1015 SourceLocation LBraceLoc, RBraceLoc; 1016public: 1017 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1018 SourceLocation rbraceloc); 1019 ~InitListExpr() { 1020 delete [] InitExprs; 1021 } 1022 1023 unsigned getNumInits() const { return NumInits; } 1024 1025 const Expr* getInit(unsigned Init) const { 1026 assert(Init < NumInits && "Initializer access out of range!"); 1027 return InitExprs[Init]; 1028 } 1029 1030 Expr* getInit(unsigned Init) { 1031 assert(Init < NumInits && "Initializer access out of range!"); 1032 return InitExprs[Init]; 1033 } 1034 1035 void setInit(unsigned Init, Expr *expr) { 1036 assert(Init < NumInits && "Initializer access out of range!"); 1037 InitExprs[Init] = expr; 1038 } 1039 1040 virtual SourceRange getSourceRange() const { 1041 return SourceRange(LBraceLoc, RBraceLoc); 1042 } 1043 static bool classof(const Stmt *T) { 1044 return T->getStmtClass() == InitListExprClass; 1045 } 1046 static bool classof(const InitListExpr *) { return true; } 1047 1048 // Iterators 1049 virtual child_iterator child_begin(); 1050 virtual child_iterator child_end(); 1051}; 1052 1053/// ObjCStringLiteral, used for Objective-C string literals 1054/// i.e. @"foo". 1055class ObjCStringLiteral : public Expr { 1056 StringLiteral *String; 1057public: 1058 ObjCStringLiteral(StringLiteral *SL, QualType T) 1059 : Expr(ObjCStringLiteralClass, T), String(SL) {} 1060 1061 StringLiteral* getString() { return String; } 1062 1063 const StringLiteral* getString() const { return String; } 1064 1065 virtual SourceRange getSourceRange() const { 1066 return String->getSourceRange(); 1067 } 1068 1069 static bool classof(const Stmt *T) { 1070 return T->getStmtClass() == ObjCStringLiteralClass; 1071 } 1072 static bool classof(const ObjCStringLiteral *) { return true; } 1073 1074 // Iterators 1075 virtual child_iterator child_begin(); 1076 virtual child_iterator child_end(); 1077}; 1078 1079/// ObjCEncodeExpr, used for @encode in Objective-C. 1080class ObjCEncodeExpr : public Expr { 1081 QualType EncType; 1082 SourceLocation AtLoc, RParenLoc; 1083public: 1084 ObjCEncodeExpr(QualType T, QualType ET, 1085 SourceLocation at, SourceLocation rp) 1086 : Expr(ObjCEncodeExprClass, T), EncType(ET), AtLoc(at), RParenLoc(rp) {} 1087 1088 SourceLocation getAtLoc() const { return AtLoc; } 1089 SourceLocation getRParenLoc() const { return RParenLoc; } 1090 1091 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1092 1093 QualType getEncodedType() const { return EncType; } 1094 1095 static bool classof(const Stmt *T) { 1096 return T->getStmtClass() == ObjCEncodeExprClass; 1097 } 1098 static bool classof(const ObjCEncodeExpr *) { return true; } 1099 1100 // Iterators 1101 virtual child_iterator child_begin(); 1102 virtual child_iterator child_end(); 1103}; 1104 1105/// ObjCSelectorExpr used for @selector in Objective-C. 1106class ObjCSelectorExpr : public Expr { 1107 1108 Selector SelName; 1109 1110 SourceLocation AtLoc, RParenLoc; 1111public: 1112 ObjCSelectorExpr(QualType T, Selector selInfo, 1113 SourceLocation at, SourceLocation rp) 1114 : Expr(ObjCSelectorExprClass, T), SelName(selInfo), 1115 AtLoc(at), RParenLoc(rp) {} 1116 1117 const Selector &getSelector() const { return SelName; } 1118 Selector &getSelector() { return SelName; } 1119 1120 SourceLocation getAtLoc() const { return AtLoc; } 1121 SourceLocation getRParenLoc() const { return RParenLoc; } 1122 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1123 1124 /// getNumArgs - Return the number of actual arguments to this call. 1125 unsigned getNumArgs() const { return SelName.getNumArgs(); } 1126 1127 static bool classof(const Stmt *T) { 1128 return T->getStmtClass() == ObjCSelectorExprClass; 1129 } 1130 static bool classof(const ObjCSelectorExpr *) { return true; } 1131 1132 // Iterators 1133 virtual child_iterator child_begin(); 1134 virtual child_iterator child_end(); 1135 1136}; 1137 1138/// ObjCProtocolExpr used for protocol in Objective-C. 1139class ObjCProtocolExpr : public Expr { 1140 1141 ObjcProtocolDecl *Protocol; 1142 1143 SourceLocation AtLoc, RParenLoc; 1144 public: 1145 ObjCProtocolExpr(QualType T, ObjcProtocolDecl *protocol, 1146 SourceLocation at, SourceLocation rp) 1147 : Expr(ObjCProtocolExprClass, T), Protocol(protocol), 1148 AtLoc(at), RParenLoc(rp) {} 1149 1150 ObjcProtocolDecl *getProtocol() const { return Protocol; } 1151 1152 SourceLocation getAtLoc() const { return AtLoc; } 1153 SourceLocation getRParenLoc() const { return RParenLoc; } 1154 SourceRange getSourceRange() const { return SourceRange(AtLoc, RParenLoc); } 1155 1156 static bool classof(const Stmt *T) { 1157 return T->getStmtClass() == ObjCProtocolExprClass; 1158 } 1159 static bool classof(const ObjCProtocolExpr *) { return true; } 1160 1161 // Iterators 1162 virtual child_iterator child_begin(); 1163 virtual child_iterator child_end(); 1164 1165}; 1166 1167class ObjCMessageExpr : public Expr { 1168 enum { RECEIVER=0, ARGS_START=1 }; 1169 1170 Expr **SubExprs; 1171 1172 // A unigue name for this message. 1173 Selector SelName; 1174 1175 IdentifierInfo *ClassName; // optional - 0 for instance messages. 1176 1177 SourceLocation LBracloc, RBracloc; 1178public: 1179 // constructor for class messages. 1180 // FIXME: clsName should be typed to ObjCInterfaceType 1181 ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1182 QualType retType, SourceLocation LBrac, SourceLocation RBrac, 1183 Expr **ArgExprs); 1184 // constructor for instance messages. 1185 ObjCMessageExpr(Expr *receiver, Selector selInfo, 1186 QualType retType, SourceLocation LBrac, SourceLocation RBrac, 1187 Expr **ArgExprs); 1188 ~ObjCMessageExpr() { 1189 delete [] SubExprs; 1190 } 1191 1192 const Expr *getReceiver() const { return SubExprs[RECEIVER]; } 1193 Expr *getReceiver() { return SubExprs[RECEIVER]; } 1194 1195 const Selector &getSelector() const { return SelName; } 1196 Selector &getSelector() { return SelName; } 1197 1198 const IdentifierInfo *getClassName() const { return ClassName; } 1199 IdentifierInfo *getClassName() { return ClassName; } 1200 1201 /// getNumArgs - Return the number of actual arguments to this call. 1202 unsigned getNumArgs() const { return SelName.getNumArgs(); } 1203 1204/// getArg - Return the specified argument. 1205 Expr *getArg(unsigned Arg) { 1206 assert(Arg < SelName.getNumArgs() && "Arg access out of range!"); 1207 return SubExprs[Arg+ARGS_START]; 1208 } 1209 const Expr *getArg(unsigned Arg) const { 1210 assert(Arg < SelName.getNumArgs() && "Arg access out of range!"); 1211 return SubExprs[Arg+ARGS_START]; 1212 } 1213 /// setArg - Set the specified argument. 1214 void setArg(unsigned Arg, Expr *ArgExpr) { 1215 assert(Arg < SelName.getNumArgs() && "Arg access out of range!"); 1216 SubExprs[Arg+ARGS_START] = ArgExpr; 1217 } 1218 SourceRange getSourceRange() const { return SourceRange(LBracloc, RBracloc); } 1219 1220 static bool classof(const Stmt *T) { 1221 return T->getStmtClass() == ObjCMessageExprClass; 1222 } 1223 static bool classof(const ObjCMessageExpr *) { return true; } 1224 1225 // Iterators 1226 virtual child_iterator child_begin(); 1227 virtual child_iterator child_end(); 1228}; 1229 1230} // end namespace clang 1231 1232#endif 1233