Expr.h revision 9048891ff983d0681c116c6e8f1073aa31bdd6e8
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 "llvm/ADT/APSInt.h" 20#include "llvm/ADT/APFloat.h" 21#include "llvm/ADT/SmallVector.h" 22#include <vector> 23 24namespace clang { 25 class ASTContext; 26 class APValue; 27 class Decl; 28 class IdentifierInfo; 29 class ParmVarDecl; 30 class ValueDecl; 31 32/// Expr - This represents one expression. Note that Expr's are subclasses of 33/// Stmt. This allows an expression to be transparently used any place a Stmt 34/// is required. 35/// 36class Expr : public Stmt { 37 QualType TR; 38protected: 39 Expr(StmtClass SC, QualType T) : Stmt(SC), TR(T) {} 40public: 41 QualType getType() const { return TR; } 42 void setType(QualType t) { TR = t; } 43 44 /// SourceLocation tokens are not useful in isolation - they are low level 45 /// value objects created/interpreted by SourceManager. We assume AST 46 /// clients will have a pointer to the respective SourceManager. 47 virtual SourceRange getSourceRange() const = 0; 48 49 /// getExprLoc - Return the preferred location for the arrow when diagnosing 50 /// a problem with a generic expression. 51 virtual SourceLocation getExprLoc() const { return getLocStart(); } 52 53 /// hasLocalSideEffect - Return true if this immediate expression has side 54 /// effects, not counting any sub-expressions. 55 bool hasLocalSideEffect() const; 56 57 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 58 /// incomplete type other than void. Nonarray expressions that can be lvalues: 59 /// - name, where name must be a variable 60 /// - e[i] 61 /// - (e), where e must be an lvalue 62 /// - e.name, where e must be an lvalue 63 /// - e->name 64 /// - *e, the type of e cannot be a function type 65 /// - string-constant 66 /// - reference type [C++ [expr]] 67 /// 68 enum isLvalueResult { 69 LV_Valid, 70 LV_NotObjectType, 71 LV_IncompleteVoidType, 72 LV_DuplicateVectorComponents, 73 LV_InvalidExpression 74 }; 75 isLvalueResult isLvalue(ASTContext &Ctx) const; 76 77 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 78 /// does not have an incomplete type, does not have a const-qualified type, 79 /// and if it is a structure or union, does not have any member (including, 80 /// recursively, any member or element of all contained aggregates or unions) 81 /// with a const-qualified type. 82 enum isModifiableLvalueResult { 83 MLV_Valid, 84 MLV_NotObjectType, 85 MLV_IncompleteVoidType, 86 MLV_DuplicateVectorComponents, 87 MLV_InvalidExpression, 88 MLV_IncompleteType, 89 MLV_ConstQualified, 90 MLV_ArrayType 91 }; 92 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx) const; 93 94 bool isNullPointerConstant(ASTContext &Ctx) const; 95 96 /// getIntegerConstantExprValue() - Return the value of an integer 97 /// constant expression. The expression must be a valid integer 98 /// constant expression as determined by isIntegerConstantExpr. 99 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 100 llvm::APSInt X; 101 bool success = isIntegerConstantExpr(X, Ctx); 102 success = success; 103 assert(success && "Illegal argument to getIntegerConstantExpr"); 104 return X; 105 } 106 107 /// isIntegerConstantExpr - Return true if this expression is a valid integer 108 /// constant expression, and, if so, return its value in Result. If not a 109 /// valid i-c-e, return false and fill in Loc (if specified) with the location 110 /// of the invalid expression. 111 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 112 SourceLocation *Loc = 0, 113 bool isEvaluated = true) const; 114 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 115 llvm::APSInt X; 116 return isIntegerConstantExpr(X, Ctx, Loc); 117 } 118 /// isConstantExpr - Return true if this expression is a valid constant expr. 119 bool isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const; 120 121 bool tryEvaluate(APValue& Result, ASTContext &Ctx) const; 122 123 /// hasGlobalStorage - Return true if this expression has static storage 124 /// duration. This means that the address of this expression is a link-time 125 /// constant. 126 bool hasGlobalStorage() const; 127 128 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 129 /// its subexpression. If that subexpression is also a ParenExpr, 130 /// then this method recursively returns its subexpression, and so forth. 131 /// Otherwise, the method returns the current Expr. 132 Expr* IgnoreParens(); 133 134 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 135 /// or CastExprs or ImplicitCastExprs, returning their operand. 136 Expr *IgnoreParenCasts(); 137 138 const Expr* IgnoreParens() const { 139 return const_cast<Expr*>(this)->IgnoreParens(); 140 } 141 const Expr *IgnoreParenCasts() const { 142 return const_cast<Expr*>(this)->IgnoreParenCasts(); 143 } 144 145 static bool classof(const Stmt *T) { 146 return T->getStmtClass() >= firstExprConstant && 147 T->getStmtClass() <= lastExprConstant; 148 } 149 static bool classof(const Expr *) { return true; } 150 151 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 152 return cast<Expr>(Stmt::Create(D, C)); 153 } 154}; 155 156//===----------------------------------------------------------------------===// 157// ExprIterator - Iterators for iterating over Stmt* arrays that contain 158// only Expr*. This is needed because AST nodes use Stmt* arrays to store 159// references to children (to be compatible with StmtIterator). 160//===----------------------------------------------------------------------===// 161 162class ExprIterator { 163 Stmt** I; 164public: 165 ExprIterator(Stmt** i) : I(i) {} 166 ExprIterator() : I(0) {} 167 ExprIterator& operator++() { ++I; return *this; } 168 ExprIterator operator-(size_t i) { return I-i; } 169 ExprIterator operator+(size_t i) { return I+i; } 170 Expr* operator[](size_t idx) { return cast<Expr>(I[idx]); } 171 // FIXME: Verify that this will correctly return a signed distance. 172 signed operator-(const ExprIterator& R) const { return I - R.I; } 173 Expr* operator*() const { return cast<Expr>(*I); } 174 Expr* operator->() const { return cast<Expr>(*I); } 175 bool operator==(const ExprIterator& R) const { return I == R.I; } 176 bool operator!=(const ExprIterator& R) const { return I != R.I; } 177 bool operator>(const ExprIterator& R) const { return I > R.I; } 178 bool operator>=(const ExprIterator& R) const { return I >= R.I; } 179}; 180 181class ConstExprIterator { 182 Stmt* const * I; 183public: 184 ConstExprIterator(Stmt* const* i) : I(i) {} 185 ConstExprIterator() : I(0) {} 186 ConstExprIterator& operator++() { ++I; return *this; } 187 ConstExprIterator operator+(size_t i) { return I+i; } 188 ConstExprIterator operator-(size_t i) { return I-i; } 189 Expr * operator[](size_t idx) const { return cast<Expr>(I[idx]); } 190 signed operator-(const ConstExprIterator& R) const { return I - R.I; } 191 Expr * operator*() const { return cast<Expr>(*I); } 192 Expr * operator->() const { return cast<Expr>(*I); } 193 bool operator==(const ConstExprIterator& R) const { return I == R.I; } 194 bool operator!=(const ConstExprIterator& R) const { return I != R.I; } 195 bool operator>(const ConstExprIterator& R) const { return I > R.I; } 196 bool operator>=(const ConstExprIterator& R) const { return I >= R.I; } 197}; 198 199 200//===----------------------------------------------------------------------===// 201// Primary Expressions. 202//===----------------------------------------------------------------------===// 203 204/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 205/// enum, etc. 206class DeclRefExpr : public Expr { 207 ValueDecl *D; 208 SourceLocation Loc; 209public: 210 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 211 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 212 213 ValueDecl *getDecl() { return D; } 214 const ValueDecl *getDecl() const { return D; } 215 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 216 217 218 static bool classof(const Stmt *T) { 219 return T->getStmtClass() == DeclRefExprClass; 220 } 221 static bool classof(const DeclRefExpr *) { return true; } 222 223 // Iterators 224 virtual child_iterator child_begin(); 225 virtual child_iterator child_end(); 226 227 virtual void EmitImpl(llvm::Serializer& S) const; 228 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 229}; 230 231/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 232class PredefinedExpr : public Expr { 233public: 234 enum IdentType { 235 Func, 236 Function, 237 PrettyFunction, 238 CXXThis, 239 ObjCSuper // super 240 }; 241 242private: 243 SourceLocation Loc; 244 IdentType Type; 245public: 246 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 247 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 248 249 IdentType getIdentType() const { return Type; } 250 251 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 252 253 static bool classof(const Stmt *T) { 254 return T->getStmtClass() == PredefinedExprClass; 255 } 256 static bool classof(const PredefinedExpr *) { return true; } 257 258 // Iterators 259 virtual child_iterator child_begin(); 260 virtual child_iterator child_end(); 261 262 virtual void EmitImpl(llvm::Serializer& S) const; 263 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 264}; 265 266class IntegerLiteral : public Expr { 267 llvm::APInt Value; 268 SourceLocation Loc; 269public: 270 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 271 // or UnsignedLongLongTy 272 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 273 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 274 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 275 } 276 const llvm::APInt &getValue() const { return Value; } 277 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 278 279 static bool classof(const Stmt *T) { 280 return T->getStmtClass() == IntegerLiteralClass; 281 } 282 static bool classof(const IntegerLiteral *) { return true; } 283 284 // Iterators 285 virtual child_iterator child_begin(); 286 virtual child_iterator child_end(); 287 288 virtual void EmitImpl(llvm::Serializer& S) const; 289 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 290}; 291 292class CharacterLiteral : public Expr { 293 unsigned Value; 294 SourceLocation Loc; 295 bool IsWide; 296public: 297 // type should be IntTy 298 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 299 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 300 } 301 SourceLocation getLoc() const { return Loc; } 302 bool isWide() const { return IsWide; } 303 304 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 305 306 unsigned getValue() const { return Value; } 307 308 static bool classof(const Stmt *T) { 309 return T->getStmtClass() == CharacterLiteralClass; 310 } 311 static bool classof(const CharacterLiteral *) { return true; } 312 313 // Iterators 314 virtual child_iterator child_begin(); 315 virtual child_iterator child_end(); 316 317 virtual void EmitImpl(llvm::Serializer& S) const; 318 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 319}; 320 321class FloatingLiteral : public Expr { 322 llvm::APFloat Value; 323 bool IsExact : 1; 324 SourceLocation Loc; 325public: 326 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 327 QualType Type, SourceLocation L) 328 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 329 330 const llvm::APFloat &getValue() const { return Value; } 331 332 bool isExact() const { return IsExact; } 333 334 /// getValueAsApproximateDouble - This returns the value as an inaccurate 335 /// double. Note that this may cause loss of precision, but is useful for 336 /// debugging dumps, etc. 337 double getValueAsApproximateDouble() const; 338 339 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 340 341 static bool classof(const Stmt *T) { 342 return T->getStmtClass() == FloatingLiteralClass; 343 } 344 static bool classof(const FloatingLiteral *) { return true; } 345 346 // Iterators 347 virtual child_iterator child_begin(); 348 virtual child_iterator child_end(); 349 350 virtual void EmitImpl(llvm::Serializer& S) const; 351 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 352}; 353 354/// ImaginaryLiteral - We support imaginary integer and floating point literals, 355/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 356/// IntegerLiteral classes. Instances of this class always have a Complex type 357/// whose element type matches the subexpression. 358/// 359class ImaginaryLiteral : public Expr { 360 Stmt *Val; 361public: 362 ImaginaryLiteral(Expr *val, QualType Ty) 363 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 364 365 const Expr *getSubExpr() const { return cast<Expr>(Val); } 366 Expr *getSubExpr() { return cast<Expr>(Val); } 367 368 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 369 static bool classof(const Stmt *T) { 370 return T->getStmtClass() == ImaginaryLiteralClass; 371 } 372 static bool classof(const ImaginaryLiteral *) { return true; } 373 374 // Iterators 375 virtual child_iterator child_begin(); 376 virtual child_iterator child_end(); 377 378 virtual void EmitImpl(llvm::Serializer& S) const; 379 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 380}; 381 382/// StringLiteral - This represents a string literal expression, e.g. "foo" 383/// or L"bar" (wide strings). The actual string is returned by getStrData() 384/// is NOT null-terminated, and the length of the string is determined by 385/// calling getByteLength(). The C type for a string is always a 386/// ConstantArrayType. 387class StringLiteral : public Expr { 388 const char *StrData; 389 unsigned ByteLength; 390 bool IsWide; 391 // if the StringLiteral was composed using token pasting, both locations 392 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 393 // FIXME: if space becomes an issue, we should create a sub-class. 394 SourceLocation firstTokLoc, lastTokLoc; 395public: 396 StringLiteral(const char *strData, unsigned byteLength, bool Wide, 397 QualType t, SourceLocation b, SourceLocation e); 398 virtual ~StringLiteral(); 399 400 const char *getStrData() const { return StrData; } 401 unsigned getByteLength() const { return ByteLength; } 402 bool isWide() const { return IsWide; } 403 404 virtual SourceRange getSourceRange() const { 405 return SourceRange(firstTokLoc,lastTokLoc); 406 } 407 static bool classof(const Stmt *T) { 408 return T->getStmtClass() == StringLiteralClass; 409 } 410 static bool classof(const StringLiteral *) { return true; } 411 412 // Iterators 413 virtual child_iterator child_begin(); 414 virtual child_iterator child_end(); 415 416 virtual void EmitImpl(llvm::Serializer& S) const; 417 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 418}; 419 420/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 421/// AST node is only formed if full location information is requested. 422class ParenExpr : public Expr { 423 SourceLocation L, R; 424 Stmt *Val; 425public: 426 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 427 : Expr(ParenExprClass, val->getType()), L(l), R(r), Val(val) {} 428 429 const Expr *getSubExpr() const { return cast<Expr>(Val); } 430 Expr *getSubExpr() { return cast<Expr>(Val); } 431 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 432 433 static bool classof(const Stmt *T) { 434 return T->getStmtClass() == ParenExprClass; 435 } 436 static bool classof(const ParenExpr *) { return true; } 437 438 // Iterators 439 virtual child_iterator child_begin(); 440 virtual child_iterator child_end(); 441 442 virtual void EmitImpl(llvm::Serializer& S) const; 443 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 444}; 445 446 447/// UnaryOperator - This represents the unary-expression's (except sizeof of 448/// types), the postinc/postdec operators from postfix-expression, and various 449/// extensions. 450/// 451/// Notes on various nodes: 452/// 453/// Real/Imag - These return the real/imag part of a complex operand. If 454/// applied to a non-complex value, the former returns its operand and the 455/// later returns zero in the type of the operand. 456/// 457/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 458/// subexpression is a compound literal with the various MemberExpr and 459/// ArraySubscriptExpr's applied to it. 460/// 461class UnaryOperator : public Expr { 462public: 463 // Note that additions to this should also update the StmtVisitor class. 464 enum Opcode { 465 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 466 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 467 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 468 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 469 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 470 SizeOf, AlignOf, // [C99 6.5.3.4] Sizeof (expr, not type) operator. 471 Real, Imag, // "__real expr"/"__imag expr" Extension. 472 Extension, // __extension__ marker. 473 OffsetOf // __builtin_offsetof 474 }; 475private: 476 Stmt *Val; 477 Opcode Opc; 478 SourceLocation Loc; 479public: 480 481 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 482 : Expr(UnaryOperatorClass, type), Val(input), Opc(opc), Loc(l) {} 483 484 Opcode getOpcode() const { return Opc; } 485 Expr *getSubExpr() const { return cast<Expr>(Val); } 486 487 /// getOperatorLoc - Return the location of the operator. 488 SourceLocation getOperatorLoc() const { return Loc; } 489 490 /// isPostfix - Return true if this is a postfix operation, like x++. 491 static bool isPostfix(Opcode Op); 492 493 /// isPostfix - Return true if this is a prefix operation, like --x. 494 static bool isPrefix(Opcode Op); 495 496 bool isPrefix() const { return isPrefix(Opc); } 497 bool isPostfix() const { return isPostfix(Opc); } 498 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 499 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 500 bool isSizeOfAlignOfOp() const { return Opc == SizeOf || Opc == AlignOf; } 501 bool isOffsetOfOp() const { return Opc == OffsetOf; } 502 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 503 504 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 505 /// corresponds to, e.g. "sizeof" or "[pre]++" 506 static const char *getOpcodeStr(Opcode Op); 507 508 virtual SourceRange getSourceRange() const { 509 if (isPostfix()) 510 return SourceRange(Val->getLocStart(), Loc); 511 else 512 return SourceRange(Loc, Val->getLocEnd()); 513 } 514 virtual SourceLocation getExprLoc() const { return Loc; } 515 516 static bool classof(const Stmt *T) { 517 return T->getStmtClass() == UnaryOperatorClass; 518 } 519 static bool classof(const UnaryOperator *) { return true; } 520 521 int64_t evaluateOffsetOf(ASTContext& C) const; 522 523 // Iterators 524 virtual child_iterator child_begin(); 525 virtual child_iterator child_end(); 526 527 virtual void EmitImpl(llvm::Serializer& S) const; 528 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 529}; 530 531/// SizeOfAlignOfTypeExpr - [C99 6.5.3.4] - This is only for sizeof/alignof of 532/// *types*. sizeof(expr) is handled by UnaryOperator. 533class SizeOfAlignOfTypeExpr : public Expr { 534 bool isSizeof; // true if sizeof, false if alignof. 535 QualType Ty; 536 SourceLocation OpLoc, RParenLoc; 537public: 538 SizeOfAlignOfTypeExpr(bool issizeof, QualType argType, QualType resultType, 539 SourceLocation op, SourceLocation rp) : 540 Expr(SizeOfAlignOfTypeExprClass, resultType), 541 isSizeof(issizeof), Ty(argType), OpLoc(op), RParenLoc(rp) {} 542 543 virtual void Destroy(ASTContext& C); 544 545 bool isSizeOf() const { return isSizeof; } 546 QualType getArgumentType() const { return Ty; } 547 548 SourceLocation getOperatorLoc() const { return OpLoc; } 549 550 virtual SourceRange getSourceRange() const { 551 return SourceRange(OpLoc, RParenLoc); 552 } 553 554 static bool classof(const Stmt *T) { 555 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 556 } 557 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 558 559 // Iterators 560 virtual child_iterator child_begin(); 561 virtual child_iterator child_end(); 562 563 virtual void EmitImpl(llvm::Serializer& S) const; 564 static SizeOfAlignOfTypeExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 565}; 566 567//===----------------------------------------------------------------------===// 568// Postfix Operators. 569//===----------------------------------------------------------------------===// 570 571/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 572class ArraySubscriptExpr : public Expr { 573 enum { LHS, RHS, END_EXPR=2 }; 574 Stmt* SubExprs[END_EXPR]; 575 SourceLocation RBracketLoc; 576public: 577 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 578 SourceLocation rbracketloc) 579 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 580 SubExprs[LHS] = lhs; 581 SubExprs[RHS] = rhs; 582 } 583 584 /// An array access can be written A[4] or 4[A] (both are equivalent). 585 /// - getBase() and getIdx() always present the normalized view: A[4]. 586 /// In this case getBase() returns "A" and getIdx() returns "4". 587 /// - getLHS() and getRHS() present the syntactic view. e.g. for 588 /// 4[A] getLHS() returns "4". 589 /// Note: Because vector element access is also written A[4] we must 590 /// predicate the format conversion in getBase and getIdx only on the 591 /// the type of the RHS, as it is possible for the LHS to be a vector of 592 /// integer type 593 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 594 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 595 596 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 597 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 598 599 Expr *getBase() { 600 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 601 } 602 603 const Expr *getBase() const { 604 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 605 } 606 607 Expr *getIdx() { 608 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 609 } 610 611 const Expr *getIdx() const { 612 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 613 } 614 615 virtual SourceRange getSourceRange() const { 616 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 617 } 618 619 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 620 621 static bool classof(const Stmt *T) { 622 return T->getStmtClass() == ArraySubscriptExprClass; 623 } 624 static bool classof(const ArraySubscriptExpr *) { return true; } 625 626 // Iterators 627 virtual child_iterator child_begin(); 628 virtual child_iterator child_end(); 629 630 virtual void EmitImpl(llvm::Serializer& S) const; 631 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 632}; 633 634 635/// CallExpr - [C99 6.5.2.2] Function Calls. 636/// 637class CallExpr : public Expr { 638 enum { FN=0, ARGS_START=1 }; 639 Stmt **SubExprs; 640 unsigned NumArgs; 641 SourceLocation RParenLoc; 642 643 // This version of the ctor is for deserialization. 644 CallExpr(Stmt** subexprs, unsigned numargs, QualType t, 645 SourceLocation rparenloc) 646 : Expr(CallExprClass,t), SubExprs(subexprs), 647 NumArgs(numargs), RParenLoc(rparenloc) {} 648 649public: 650 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 651 SourceLocation rparenloc); 652 ~CallExpr() { 653 delete [] SubExprs; 654 } 655 656 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 657 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 658 void setCallee(Expr *F) { SubExprs[FN] = F; } 659 660 /// getNumArgs - Return the number of actual arguments to this call. 661 /// 662 unsigned getNumArgs() const { return NumArgs; } 663 664 /// getArg - Return the specified argument. 665 Expr *getArg(unsigned Arg) { 666 assert(Arg < NumArgs && "Arg access out of range!"); 667 return cast<Expr>(SubExprs[Arg+ARGS_START]); 668 } 669 const Expr *getArg(unsigned Arg) const { 670 assert(Arg < NumArgs && "Arg access out of range!"); 671 return cast<Expr>(SubExprs[Arg+ARGS_START]); 672 } 673 /// setArg - Set the specified argument. 674 void setArg(unsigned Arg, Expr *ArgExpr) { 675 assert(Arg < NumArgs && "Arg access out of range!"); 676 SubExprs[Arg+ARGS_START] = ArgExpr; 677 } 678 679 /// setNumArgs - This changes the number of arguments present in this call. 680 /// Any orphaned expressions are deleted by this, and any new operands are set 681 /// to null. 682 void setNumArgs(unsigned NumArgs); 683 684 typedef ExprIterator arg_iterator; 685 typedef ConstExprIterator const_arg_iterator; 686 687 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 688 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 689 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 690 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 691 692 /// getNumCommas - Return the number of commas that must have been present in 693 /// this function call. 694 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 695 696 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 697 698 /// isBuiltinConstantExpr - Return true if this built-in call is constant. 699 bool isBuiltinConstantExpr() const; 700 701 SourceLocation getRParenLoc() const { return RParenLoc; } 702 703 virtual SourceRange getSourceRange() const { 704 return SourceRange(getCallee()->getLocStart(), RParenLoc); 705 } 706 707 static bool classof(const Stmt *T) { 708 return T->getStmtClass() == CallExprClass; 709 } 710 static bool classof(const CallExpr *) { return true; } 711 712 // Iterators 713 virtual child_iterator child_begin(); 714 virtual child_iterator child_end(); 715 716 virtual void EmitImpl(llvm::Serializer& S) const; 717 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 718}; 719 720/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 721/// 722class MemberExpr : public Expr { 723 Stmt *Base; 724 FieldDecl *MemberDecl; 725 SourceLocation MemberLoc; 726 bool IsArrow; // True if this is "X->F", false if this is "X.F". 727public: 728 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l, 729 QualType ty) 730 : Expr(MemberExprClass, ty), 731 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 732 733 Expr *getBase() const { return cast<Expr>(Base); } 734 FieldDecl *getMemberDecl() const { return MemberDecl; } 735 bool isArrow() const { return IsArrow; } 736 737 virtual SourceRange getSourceRange() const { 738 return SourceRange(getBase()->getLocStart(), MemberLoc); 739 } 740 741 virtual SourceLocation getExprLoc() const { return MemberLoc; } 742 743 static bool classof(const Stmt *T) { 744 return T->getStmtClass() == MemberExprClass; 745 } 746 static bool classof(const MemberExpr *) { return true; } 747 748 // Iterators 749 virtual child_iterator child_begin(); 750 virtual child_iterator child_end(); 751 752 virtual void EmitImpl(llvm::Serializer& S) const; 753 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 754}; 755 756/// ExtVectorElementExpr - This represents access to specific elements of a 757/// vector, and may occur on the left hand side or right hand side. For example 758/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 759/// 760class ExtVectorElementExpr : public Expr { 761 Stmt *Base; 762 IdentifierInfo &Accessor; 763 SourceLocation AccessorLoc; 764public: 765 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 766 SourceLocation loc) 767 : Expr(ExtVectorElementExprClass, ty), 768 Base(base), Accessor(accessor), AccessorLoc(loc) {} 769 770 const Expr *getBase() const { return cast<Expr>(Base); } 771 Expr *getBase() { return cast<Expr>(Base); } 772 773 IdentifierInfo &getAccessor() const { return Accessor; } 774 775 /// getNumElements - Get the number of components being selected. 776 unsigned getNumElements() const; 777 778 /// containsDuplicateElements - Return true if any element access is 779 /// repeated. 780 bool containsDuplicateElements() const; 781 782 /// getEncodedElementAccess - Encode the elements accessed into an llvm 783 /// aggregate Constant of ConstantInt(s). 784 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 785 786 virtual SourceRange getSourceRange() const { 787 return SourceRange(getBase()->getLocStart(), AccessorLoc); 788 } 789 790 static bool classof(const Stmt *T) { 791 return T->getStmtClass() == ExtVectorElementExprClass; 792 } 793 static bool classof(const ExtVectorElementExpr *) { return true; } 794 795 // Iterators 796 virtual child_iterator child_begin(); 797 virtual child_iterator child_end(); 798}; 799 800/// CompoundLiteralExpr - [C99 6.5.2.5] 801/// 802class CompoundLiteralExpr : public Expr { 803 /// LParenLoc - If non-null, this is the location of the left paren in a 804 /// compound literal like "(int){4}". This can be null if this is a 805 /// synthesized compound expression. 806 SourceLocation LParenLoc; 807 Stmt *Init; 808 bool FileScope; 809public: 810 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, bool fileScope) : 811 Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), FileScope(fileScope) {} 812 813 const Expr *getInitializer() const { return cast<Expr>(Init); } 814 Expr *getInitializer() { return cast<Expr>(Init); } 815 816 bool isFileScope() const { return FileScope; } 817 818 SourceLocation getLParenLoc() const { return LParenLoc; } 819 820 virtual SourceRange getSourceRange() const { 821 // FIXME: Init should never be null. 822 if (!Init) 823 return SourceRange(); 824 if (LParenLoc.isInvalid()) 825 return Init->getSourceRange(); 826 return SourceRange(LParenLoc, Init->getLocEnd()); 827 } 828 829 static bool classof(const Stmt *T) { 830 return T->getStmtClass() == CompoundLiteralExprClass; 831 } 832 static bool classof(const CompoundLiteralExpr *) { return true; } 833 834 // Iterators 835 virtual child_iterator child_begin(); 836 virtual child_iterator child_end(); 837 838 virtual void EmitImpl(llvm::Serializer& S) const; 839 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 840}; 841 842/// CastExpr - Base class for Cast Operators (explicit, implicit, etc.). 843/// Classes that derive from CastExpr are: 844/// 845/// ImplicitCastExpr 846/// ExplicitCastExpr 847/// 848class CastExpr : public Expr { 849 Stmt *Op; 850protected: 851 CastExpr(StmtClass SC, QualType ty, Expr *op) : 852 Expr(SC, ty), Op(op) {} 853 854public: 855 Expr *getSubExpr() { return cast<Expr>(Op); } 856 const Expr *getSubExpr() const { return cast<Expr>(Op); } 857 858 static bool classof(const Stmt *T) { 859 switch (T->getStmtClass()) { 860 case ImplicitCastExprClass: 861 case ExplicitCastExprClass: 862 case CXXFunctionalCastExprClass: 863 return true; 864 default: 865 return false; 866 } 867 } 868 static bool classof(const CastExpr *) { return true; } 869 870 // Iterators 871 virtual child_iterator child_begin(); 872 virtual child_iterator child_end(); 873}; 874 875/// ImplicitCastExpr - Allows us to explicitly represent implicit type 876/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 877/// float->double, short->int, etc. 878/// 879class ImplicitCastExpr : public CastExpr { 880public: 881 ImplicitCastExpr(QualType ty, Expr *op) : 882 CastExpr(ImplicitCastExprClass, ty, op) {} 883 884 virtual SourceRange getSourceRange() const { 885 return getSubExpr()->getSourceRange(); 886 } 887 888 static bool classof(const Stmt *T) { 889 return T->getStmtClass() == ImplicitCastExprClass; 890 } 891 static bool classof(const ImplicitCastExpr *) { return true; } 892 893 virtual void EmitImpl(llvm::Serializer& S) const; 894 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 895}; 896 897/// ExplicitCastExpr - [C99 6.5.4] Cast Operators. 898/// 899class ExplicitCastExpr : public CastExpr { 900 SourceLocation Loc; // the location of the left paren 901public: 902 ExplicitCastExpr(QualType ty, Expr *op, SourceLocation l) : 903 CastExpr(ExplicitCastExprClass, ty, op), Loc(l) {} 904 905 SourceLocation getLParenLoc() const { return Loc; } 906 907 virtual SourceRange getSourceRange() const { 908 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 909 } 910 static bool classof(const Stmt *T) { 911 return T->getStmtClass() == ExplicitCastExprClass; 912 } 913 static bool classof(const ExplicitCastExpr *) { return true; } 914 915 virtual void EmitImpl(llvm::Serializer& S) const; 916 static ExplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 917}; 918 919class BinaryOperator : public Expr { 920public: 921 enum Opcode { 922 // Operators listed in order of precedence. 923 // Note that additions to this should also update the StmtVisitor class. 924 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 925 Add, Sub, // [C99 6.5.6] Additive operators. 926 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 927 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 928 EQ, NE, // [C99 6.5.9] Equality operators. 929 And, // [C99 6.5.10] Bitwise AND operator. 930 Xor, // [C99 6.5.11] Bitwise XOR operator. 931 Or, // [C99 6.5.12] Bitwise OR operator. 932 LAnd, // [C99 6.5.13] Logical AND operator. 933 LOr, // [C99 6.5.14] Logical OR operator. 934 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 935 DivAssign, RemAssign, 936 AddAssign, SubAssign, 937 ShlAssign, ShrAssign, 938 AndAssign, XorAssign, 939 OrAssign, 940 Comma // [C99 6.5.17] Comma operator. 941 }; 942private: 943 enum { LHS, RHS, END_EXPR }; 944 Stmt* SubExprs[END_EXPR]; 945 Opcode Opc; 946 SourceLocation OpLoc; 947public: 948 949 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 950 SourceLocation opLoc) 951 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 952 SubExprs[LHS] = lhs; 953 SubExprs[RHS] = rhs; 954 assert(!isCompoundAssignmentOp() && 955 "Use ArithAssignBinaryOperator for compound assignments"); 956 } 957 958 SourceLocation getOperatorLoc() const { return OpLoc; } 959 Opcode getOpcode() const { return Opc; } 960 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 961 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 962 virtual SourceRange getSourceRange() const { 963 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 964 } 965 966 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 967 /// corresponds to, e.g. "<<=". 968 static const char *getOpcodeStr(Opcode Op); 969 970 /// predicates to categorize the respective opcodes. 971 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 972 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 973 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 974 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 975 976 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 977 bool isRelationalOp() const { return isRelationalOp(Opc); } 978 979 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 980 bool isEqualityOp() const { return isEqualityOp(Opc); } 981 982 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 983 bool isLogicalOp() const { return isLogicalOp(Opc); } 984 985 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 986 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 987 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 988 989 static bool classof(const Stmt *S) { 990 return S->getStmtClass() == BinaryOperatorClass || 991 S->getStmtClass() == CompoundAssignOperatorClass; 992 } 993 static bool classof(const BinaryOperator *) { return true; } 994 995 // Iterators 996 virtual child_iterator child_begin(); 997 virtual child_iterator child_end(); 998 999 virtual void EmitImpl(llvm::Serializer& S) const; 1000 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1001 1002protected: 1003 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1004 SourceLocation oploc, bool dead) 1005 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1006 SubExprs[LHS] = lhs; 1007 SubExprs[RHS] = rhs; 1008 } 1009}; 1010 1011/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1012/// track of the type the operation is performed in. Due to the semantics of 1013/// these operators, the operands are promoted, the aritmetic performed, an 1014/// implicit conversion back to the result type done, then the assignment takes 1015/// place. This captures the intermediate type which the computation is done 1016/// in. 1017class CompoundAssignOperator : public BinaryOperator { 1018 QualType ComputationType; 1019public: 1020 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1021 QualType ResType, QualType CompType, 1022 SourceLocation OpLoc) 1023 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1024 ComputationType(CompType) { 1025 assert(isCompoundAssignmentOp() && 1026 "Only should be used for compound assignments"); 1027 } 1028 1029 QualType getComputationType() const { return ComputationType; } 1030 1031 static bool classof(const CompoundAssignOperator *) { return true; } 1032 static bool classof(const Stmt *S) { 1033 return S->getStmtClass() == CompoundAssignOperatorClass; 1034 } 1035 1036 virtual void EmitImpl(llvm::Serializer& S) const; 1037 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1038 ASTContext& C); 1039}; 1040 1041/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1042/// GNU "missing LHS" extension is in use. 1043/// 1044class ConditionalOperator : public Expr { 1045 enum { COND, LHS, RHS, END_EXPR }; 1046 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1047public: 1048 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1049 : Expr(ConditionalOperatorClass, t) { 1050 SubExprs[COND] = cond; 1051 SubExprs[LHS] = lhs; 1052 SubExprs[RHS] = rhs; 1053 } 1054 1055 // getCond - Return the expression representing the condition for 1056 // the ?: operator. 1057 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1058 1059 // getTrueExpr - Return the subexpression representing the value of the ?: 1060 // expression if the condition evaluates to true. In most cases this value 1061 // will be the same as getLHS() except a GCC extension allows the left 1062 // subexpression to be omitted, and instead of the condition be returned. 1063 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1064 // is only evaluated once. 1065 Expr *getTrueExpr() const { 1066 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1067 } 1068 1069 // getTrueExpr - Return the subexpression representing the value of the ?: 1070 // expression if the condition evaluates to false. This is the same as getRHS. 1071 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1072 1073 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1074 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1075 1076 virtual SourceRange getSourceRange() const { 1077 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1078 } 1079 static bool classof(const Stmt *T) { 1080 return T->getStmtClass() == ConditionalOperatorClass; 1081 } 1082 static bool classof(const ConditionalOperator *) { return true; } 1083 1084 // Iterators 1085 virtual child_iterator child_begin(); 1086 virtual child_iterator child_end(); 1087 1088 virtual void EmitImpl(llvm::Serializer& S) const; 1089 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1090}; 1091 1092/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1093class AddrLabelExpr : public Expr { 1094 SourceLocation AmpAmpLoc, LabelLoc; 1095 LabelStmt *Label; 1096public: 1097 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1098 QualType t) 1099 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1100 1101 virtual SourceRange getSourceRange() const { 1102 return SourceRange(AmpAmpLoc, LabelLoc); 1103 } 1104 1105 LabelStmt *getLabel() const { return Label; } 1106 1107 static bool classof(const Stmt *T) { 1108 return T->getStmtClass() == AddrLabelExprClass; 1109 } 1110 static bool classof(const AddrLabelExpr *) { return true; } 1111 1112 // Iterators 1113 virtual child_iterator child_begin(); 1114 virtual child_iterator child_end(); 1115 1116 virtual void EmitImpl(llvm::Serializer& S) const; 1117 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1118}; 1119 1120/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1121/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1122/// takes the value of the last subexpression. 1123class StmtExpr : public Expr { 1124 Stmt *SubStmt; 1125 SourceLocation LParenLoc, RParenLoc; 1126public: 1127 StmtExpr(CompoundStmt *substmt, QualType T, 1128 SourceLocation lp, SourceLocation rp) : 1129 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1130 1131 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1132 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1133 1134 virtual SourceRange getSourceRange() const { 1135 return SourceRange(LParenLoc, RParenLoc); 1136 } 1137 1138 static bool classof(const Stmt *T) { 1139 return T->getStmtClass() == StmtExprClass; 1140 } 1141 static bool classof(const StmtExpr *) { return true; } 1142 1143 // Iterators 1144 virtual child_iterator child_begin(); 1145 virtual child_iterator child_end(); 1146 1147 virtual void EmitImpl(llvm::Serializer& S) const; 1148 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1149}; 1150 1151/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1152/// This AST node represents a function that returns 1 if two *types* (not 1153/// expressions) are compatible. The result of this built-in function can be 1154/// used in integer constant expressions. 1155class TypesCompatibleExpr : public Expr { 1156 QualType Type1; 1157 QualType Type2; 1158 SourceLocation BuiltinLoc, RParenLoc; 1159public: 1160 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1161 QualType t1, QualType t2, SourceLocation RP) : 1162 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1163 BuiltinLoc(BLoc), RParenLoc(RP) {} 1164 1165 QualType getArgType1() const { return Type1; } 1166 QualType getArgType2() const { return Type2; } 1167 1168 virtual SourceRange getSourceRange() const { 1169 return SourceRange(BuiltinLoc, RParenLoc); 1170 } 1171 static bool classof(const Stmt *T) { 1172 return T->getStmtClass() == TypesCompatibleExprClass; 1173 } 1174 static bool classof(const TypesCompatibleExpr *) { return true; } 1175 1176 // Iterators 1177 virtual child_iterator child_begin(); 1178 virtual child_iterator child_end(); 1179}; 1180 1181/// ShuffleVectorExpr - clang-specific builtin-in function 1182/// __builtin_shufflevector. 1183/// This AST node represents a operator that does a constant 1184/// shuffle, similar to LLVM's shufflevector instruction. It takes 1185/// two vectors and a variable number of constant indices, 1186/// and returns the appropriately shuffled vector. 1187class ShuffleVectorExpr : public Expr { 1188 SourceLocation BuiltinLoc, RParenLoc; 1189 1190 // SubExprs - the list of values passed to the __builtin_shufflevector 1191 // function. The first two are vectors, and the rest are constant 1192 // indices. The number of values in this list is always 1193 // 2+the number of indices in the vector type. 1194 Stmt **SubExprs; 1195 unsigned NumExprs; 1196 1197public: 1198 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1199 QualType Type, SourceLocation BLoc, 1200 SourceLocation RP) : 1201 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1202 RParenLoc(RP), NumExprs(nexpr) { 1203 1204 SubExprs = new Stmt*[nexpr]; 1205 for (unsigned i = 0; i < nexpr; i++) 1206 SubExprs[i] = args[i]; 1207 } 1208 1209 virtual SourceRange getSourceRange() const { 1210 return SourceRange(BuiltinLoc, RParenLoc); 1211 } 1212 static bool classof(const Stmt *T) { 1213 return T->getStmtClass() == ShuffleVectorExprClass; 1214 } 1215 static bool classof(const ShuffleVectorExpr *) { return true; } 1216 1217 ~ShuffleVectorExpr() { 1218 delete [] SubExprs; 1219 } 1220 1221 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1222 /// constant expression, the actual arguments passed in, and the function 1223 /// pointers. 1224 unsigned getNumSubExprs() const { return NumExprs; } 1225 1226 /// getExpr - Return the Expr at the specified index. 1227 Expr *getExpr(unsigned Index) { 1228 assert((Index < NumExprs) && "Arg access out of range!"); 1229 return cast<Expr>(SubExprs[Index]); 1230 } 1231 const Expr *getExpr(unsigned Index) const { 1232 assert((Index < NumExprs) && "Arg access out of range!"); 1233 return cast<Expr>(SubExprs[Index]); 1234 } 1235 1236 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1237 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1238 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1239 } 1240 1241 // Iterators 1242 virtual child_iterator child_begin(); 1243 virtual child_iterator child_end(); 1244}; 1245 1246/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1247/// This AST node is similar to the conditional operator (?:) in C, with 1248/// the following exceptions: 1249/// - the test expression much be a constant expression. 1250/// - the expression returned has it's type unaltered by promotion rules. 1251/// - does not evaluate the expression that was not chosen. 1252class ChooseExpr : public Expr { 1253 enum { COND, LHS, RHS, END_EXPR }; 1254 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1255 SourceLocation BuiltinLoc, RParenLoc; 1256public: 1257 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1258 SourceLocation RP) 1259 : Expr(ChooseExprClass, t), 1260 BuiltinLoc(BLoc), RParenLoc(RP) { 1261 SubExprs[COND] = cond; 1262 SubExprs[LHS] = lhs; 1263 SubExprs[RHS] = rhs; 1264 } 1265 1266 /// isConditionTrue - Return true if the condition is true. This is always 1267 /// statically knowable for a well-formed choosexpr. 1268 bool isConditionTrue(ASTContext &C) const; 1269 1270 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1271 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1272 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1273 1274 virtual SourceRange getSourceRange() const { 1275 return SourceRange(BuiltinLoc, RParenLoc); 1276 } 1277 static bool classof(const Stmt *T) { 1278 return T->getStmtClass() == ChooseExprClass; 1279 } 1280 static bool classof(const ChooseExpr *) { return true; } 1281 1282 // Iterators 1283 virtual child_iterator child_begin(); 1284 virtual child_iterator child_end(); 1285}; 1286 1287/// OverloadExpr - Clang builtin function __builtin_overload. 1288/// This AST node provides a way to overload functions in C. 1289/// 1290/// The first argument is required to be a constant expression, for the number 1291/// of arguments passed to each candidate function. 1292/// 1293/// The next N arguments, where N is the value of the constant expression, 1294/// are the values to be passed as arguments. 1295/// 1296/// The rest of the arguments are values of pointer to function type, which 1297/// are the candidate functions for overloading. 1298/// 1299/// The result is a equivalent to a CallExpr taking N arguments to the 1300/// candidate function whose parameter types match the types of the N arguments. 1301/// 1302/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1303/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1304/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1305class OverloadExpr : public Expr { 1306 // SubExprs - the list of values passed to the __builtin_overload function. 1307 // SubExpr[0] is a constant expression 1308 // SubExpr[1-N] are the parameters to pass to the matching function call 1309 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1310 Stmt **SubExprs; 1311 1312 // NumExprs - the size of the SubExprs array 1313 unsigned NumExprs; 1314 1315 // The index of the matching candidate function 1316 unsigned FnIndex; 1317 1318 SourceLocation BuiltinLoc; 1319 SourceLocation RParenLoc; 1320public: 1321 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1322 SourceLocation bloc, SourceLocation rploc) 1323 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1324 BuiltinLoc(bloc), RParenLoc(rploc) { 1325 SubExprs = new Stmt*[nexprs]; 1326 for (unsigned i = 0; i != nexprs; ++i) 1327 SubExprs[i] = args[i]; 1328 } 1329 ~OverloadExpr() { 1330 delete [] SubExprs; 1331 } 1332 1333 /// arg_begin - Return a pointer to the list of arguments that will be passed 1334 /// to the matching candidate function, skipping over the initial constant 1335 /// expression. 1336 typedef ConstExprIterator const_arg_iterator; 1337 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1338 const_arg_iterator arg_end(ASTContext& Ctx) const { 1339 return &SubExprs[0]+1+getNumArgs(Ctx); 1340 } 1341 1342 /// getNumArgs - Return the number of arguments to pass to the candidate 1343 /// functions. 1344 unsigned getNumArgs(ASTContext &Ctx) const { 1345 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1346 } 1347 1348 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1349 /// constant expression, the actual arguments passed in, and the function 1350 /// pointers. 1351 unsigned getNumSubExprs() const { return NumExprs; } 1352 1353 /// getExpr - Return the Expr at the specified index. 1354 Expr *getExpr(unsigned Index) const { 1355 assert((Index < NumExprs) && "Arg access out of range!"); 1356 return cast<Expr>(SubExprs[Index]); 1357 } 1358 1359 /// getFn - Return the matching candidate function for this OverloadExpr. 1360 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1361 1362 virtual SourceRange getSourceRange() const { 1363 return SourceRange(BuiltinLoc, RParenLoc); 1364 } 1365 static bool classof(const Stmt *T) { 1366 return T->getStmtClass() == OverloadExprClass; 1367 } 1368 static bool classof(const OverloadExpr *) { return true; } 1369 1370 // Iterators 1371 virtual child_iterator child_begin(); 1372 virtual child_iterator child_end(); 1373}; 1374 1375/// VAArgExpr, used for the builtin function __builtin_va_start. 1376class VAArgExpr : public Expr { 1377 Stmt *Val; 1378 SourceLocation BuiltinLoc, RParenLoc; 1379public: 1380 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1381 : Expr(VAArgExprClass, t), 1382 Val(e), 1383 BuiltinLoc(BLoc), 1384 RParenLoc(RPLoc) { } 1385 1386 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1387 Expr *getSubExpr() { return cast<Expr>(Val); } 1388 virtual SourceRange getSourceRange() const { 1389 return SourceRange(BuiltinLoc, RParenLoc); 1390 } 1391 static bool classof(const Stmt *T) { 1392 return T->getStmtClass() == VAArgExprClass; 1393 } 1394 static bool classof(const VAArgExpr *) { return true; } 1395 1396 // Iterators 1397 virtual child_iterator child_begin(); 1398 virtual child_iterator child_end(); 1399}; 1400 1401/// InitListExpr - used for struct and array initializers, such as: 1402/// struct foo x = { 1, { 2, 3 } }; 1403/// 1404/// Because C is somewhat loose with braces, the AST does not necessarily 1405/// directly model the C source. Instead, the semantic analyzer aims to make 1406/// the InitListExprs match up with the type of the decl being initialized. We 1407/// have the following exceptions: 1408/// 1409/// 1. Elements at the end of the list may be dropped from the initializer. 1410/// These elements are defined to be initialized to zero. For example: 1411/// int x[20] = { 1 }; 1412/// 2. Initializers may have excess initializers which are to be ignored by the 1413/// compiler. For example: 1414/// int x[1] = { 1, 2 }; 1415/// 3. Redundant InitListExprs may be present around scalar elements. These 1416/// always have a single element whose type is the same as the InitListExpr. 1417/// this can only happen for Type::isScalarType() types. 1418/// int x = { 1 }; int y[2] = { {1}, {2} }; 1419/// 1420class InitListExpr : public Expr { 1421 std::vector<Stmt *> InitExprs; 1422 SourceLocation LBraceLoc, RBraceLoc; 1423public: 1424 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1425 SourceLocation rbraceloc); 1426 1427 unsigned getNumInits() const { return InitExprs.size(); } 1428 1429 const Expr* getInit(unsigned Init) const { 1430 assert(Init < getNumInits() && "Initializer access out of range!"); 1431 return cast<Expr>(InitExprs[Init]); 1432 } 1433 1434 Expr* getInit(unsigned Init) { 1435 assert(Init < getNumInits() && "Initializer access out of range!"); 1436 return cast<Expr>(InitExprs[Init]); 1437 } 1438 1439 void setInit(unsigned Init, Expr *expr) { 1440 assert(Init < getNumInits() && "Initializer access out of range!"); 1441 InitExprs[Init] = expr; 1442 } 1443 1444 // Dynamic removal/addition (for constructing implicit InitExpr's). 1445 void removeInit(unsigned Init) { 1446 InitExprs.erase(InitExprs.begin()+Init); 1447 } 1448 void addInit(unsigned Init, Expr *expr) { 1449 InitExprs.insert(InitExprs.begin()+Init, expr); 1450 } 1451 1452 // Explicit InitListExpr's originate from source code (and have valid source 1453 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1454 bool isExplicit() { 1455 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1456 } 1457 1458 virtual SourceRange getSourceRange() const { 1459 return SourceRange(LBraceLoc, RBraceLoc); 1460 } 1461 static bool classof(const Stmt *T) { 1462 return T->getStmtClass() == InitListExprClass; 1463 } 1464 static bool classof(const InitListExpr *) { return true; } 1465 1466 // Iterators 1467 virtual child_iterator child_begin(); 1468 virtual child_iterator child_end(); 1469 1470 virtual void EmitImpl(llvm::Serializer& S) const; 1471 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1472 1473private: 1474 // Used by serializer. 1475 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1476}; 1477 1478} // end namespace clang 1479 1480#endif 1481