Expr.h revision cb6accb4659af86627ce43f7a90bc92f763b075e
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 bool isSizeOf() const { return isSizeof; } 544 QualType getArgumentType() const { return Ty; } 545 546 SourceLocation getOperatorLoc() const { return OpLoc; } 547 548 virtual SourceRange getSourceRange() const { 549 return SourceRange(OpLoc, RParenLoc); 550 } 551 552 static bool classof(const Stmt *T) { 553 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 554 } 555 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 556 557 // Iterators 558 virtual child_iterator child_begin(); 559 virtual child_iterator child_end(); 560 561 virtual void EmitImpl(llvm::Serializer& S) const; 562 static SizeOfAlignOfTypeExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 563}; 564 565//===----------------------------------------------------------------------===// 566// Postfix Operators. 567//===----------------------------------------------------------------------===// 568 569/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 570class ArraySubscriptExpr : public Expr { 571 enum { LHS, RHS, END_EXPR=2 }; 572 Stmt* SubExprs[END_EXPR]; 573 SourceLocation RBracketLoc; 574public: 575 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 576 SourceLocation rbracketloc) 577 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 578 SubExprs[LHS] = lhs; 579 SubExprs[RHS] = rhs; 580 } 581 582 /// An array access can be written A[4] or 4[A] (both are equivalent). 583 /// - getBase() and getIdx() always present the normalized view: A[4]. 584 /// In this case getBase() returns "A" and getIdx() returns "4". 585 /// - getLHS() and getRHS() present the syntactic view. e.g. for 586 /// 4[A] getLHS() returns "4". 587 /// Note: Because vector element access is also written A[4] we must 588 /// predicate the format conversion in getBase and getIdx only on the 589 /// the type of the RHS, as it is possible for the LHS to be a vector of 590 /// integer type 591 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 592 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 593 594 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 595 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 596 597 Expr *getBase() { 598 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 599 } 600 601 const Expr *getBase() const { 602 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 603 } 604 605 Expr *getIdx() { 606 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 607 } 608 609 const Expr *getIdx() const { 610 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 611 } 612 613 virtual SourceRange getSourceRange() const { 614 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 615 } 616 617 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 618 619 static bool classof(const Stmt *T) { 620 return T->getStmtClass() == ArraySubscriptExprClass; 621 } 622 static bool classof(const ArraySubscriptExpr *) { return true; } 623 624 // Iterators 625 virtual child_iterator child_begin(); 626 virtual child_iterator child_end(); 627 628 virtual void EmitImpl(llvm::Serializer& S) const; 629 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 630}; 631 632 633/// CallExpr - [C99 6.5.2.2] Function Calls. 634/// 635class CallExpr : public Expr { 636 enum { FN=0, ARGS_START=1 }; 637 Stmt **SubExprs; 638 unsigned NumArgs; 639 SourceLocation RParenLoc; 640 641 // This version of the ctor is for deserialization. 642 CallExpr(Stmt** subexprs, unsigned numargs, QualType t, 643 SourceLocation rparenloc) 644 : Expr(CallExprClass,t), SubExprs(subexprs), 645 NumArgs(numargs), RParenLoc(rparenloc) {} 646 647public: 648 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 649 SourceLocation rparenloc); 650 ~CallExpr() { 651 delete [] SubExprs; 652 } 653 654 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 655 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 656 void setCallee(Expr *F) { SubExprs[FN] = F; } 657 658 /// getNumArgs - Return the number of actual arguments to this call. 659 /// 660 unsigned getNumArgs() const { return NumArgs; } 661 662 /// getArg - Return the specified argument. 663 Expr *getArg(unsigned Arg) { 664 assert(Arg < NumArgs && "Arg access out of range!"); 665 return cast<Expr>(SubExprs[Arg+ARGS_START]); 666 } 667 const Expr *getArg(unsigned Arg) const { 668 assert(Arg < NumArgs && "Arg access out of range!"); 669 return cast<Expr>(SubExprs[Arg+ARGS_START]); 670 } 671 /// setArg - Set the specified argument. 672 void setArg(unsigned Arg, Expr *ArgExpr) { 673 assert(Arg < NumArgs && "Arg access out of range!"); 674 SubExprs[Arg+ARGS_START] = ArgExpr; 675 } 676 677 /// setNumArgs - This changes the number of arguments present in this call. 678 /// Any orphaned expressions are deleted by this, and any new operands are set 679 /// to null. 680 void setNumArgs(unsigned NumArgs); 681 682 typedef ExprIterator arg_iterator; 683 typedef ConstExprIterator const_arg_iterator; 684 685 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 686 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 687 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 688 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 689 690 /// getNumCommas - Return the number of commas that must have been present in 691 /// this function call. 692 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 693 694 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 695 696 /// isBuiltinConstantExpr - Return true if this built-in call is constant. 697 bool isBuiltinConstantExpr() const; 698 699 SourceLocation getRParenLoc() const { return RParenLoc; } 700 701 virtual SourceRange getSourceRange() const { 702 return SourceRange(getCallee()->getLocStart(), RParenLoc); 703 } 704 705 static bool classof(const Stmt *T) { 706 return T->getStmtClass() == CallExprClass; 707 } 708 static bool classof(const CallExpr *) { return true; } 709 710 // Iterators 711 virtual child_iterator child_begin(); 712 virtual child_iterator child_end(); 713 714 virtual void EmitImpl(llvm::Serializer& S) const; 715 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 716}; 717 718/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 719/// 720class MemberExpr : public Expr { 721 Stmt *Base; 722 FieldDecl *MemberDecl; 723 SourceLocation MemberLoc; 724 bool IsArrow; // True if this is "X->F", false if this is "X.F". 725public: 726 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l, 727 QualType ty) 728 : Expr(MemberExprClass, ty), 729 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 730 731 Expr *getBase() const { return cast<Expr>(Base); } 732 FieldDecl *getMemberDecl() const { return MemberDecl; } 733 bool isArrow() const { return IsArrow; } 734 735 virtual SourceRange getSourceRange() const { 736 return SourceRange(getBase()->getLocStart(), MemberLoc); 737 } 738 739 virtual SourceLocation getExprLoc() const { return MemberLoc; } 740 741 static bool classof(const Stmt *T) { 742 return T->getStmtClass() == MemberExprClass; 743 } 744 static bool classof(const MemberExpr *) { return true; } 745 746 // Iterators 747 virtual child_iterator child_begin(); 748 virtual child_iterator child_end(); 749 750 virtual void EmitImpl(llvm::Serializer& S) const; 751 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 752}; 753 754/// ExtVectorElementExpr - This represents access to specific elements of a 755/// vector, and may occur on the left hand side or right hand side. For example 756/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 757/// 758class ExtVectorElementExpr : public Expr { 759 Stmt *Base; 760 IdentifierInfo &Accessor; 761 SourceLocation AccessorLoc; 762public: 763 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 764 SourceLocation loc) 765 : Expr(ExtVectorElementExprClass, ty), 766 Base(base), Accessor(accessor), AccessorLoc(loc) {} 767 768 const Expr *getBase() const { return cast<Expr>(Base); } 769 Expr *getBase() { return cast<Expr>(Base); } 770 771 IdentifierInfo &getAccessor() const { return Accessor; } 772 773 /// getNumElements - Get the number of components being selected. 774 unsigned getNumElements() const; 775 776 /// containsDuplicateElements - Return true if any element access is 777 /// repeated. 778 bool containsDuplicateElements() const; 779 780 /// getEncodedElementAccess - Encode the elements accessed into an llvm 781 /// aggregate Constant of ConstantInt(s). 782 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 783 784 virtual SourceRange getSourceRange() const { 785 return SourceRange(getBase()->getLocStart(), AccessorLoc); 786 } 787 788 static bool classof(const Stmt *T) { 789 return T->getStmtClass() == ExtVectorElementExprClass; 790 } 791 static bool classof(const ExtVectorElementExpr *) { return true; } 792 793 // Iterators 794 virtual child_iterator child_begin(); 795 virtual child_iterator child_end(); 796}; 797 798/// CompoundLiteralExpr - [C99 6.5.2.5] 799/// 800class CompoundLiteralExpr : public Expr { 801 /// LParenLoc - If non-null, this is the location of the left paren in a 802 /// compound literal like "(int){4}". This can be null if this is a 803 /// synthesized compound expression. 804 SourceLocation LParenLoc; 805 Stmt *Init; 806 bool FileScope; 807public: 808 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, bool fileScope) : 809 Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), FileScope(fileScope) {} 810 811 const Expr *getInitializer() const { return cast<Expr>(Init); } 812 Expr *getInitializer() { return cast<Expr>(Init); } 813 814 bool isFileScope() const { return FileScope; } 815 816 SourceLocation getLParenLoc() const { return LParenLoc; } 817 818 virtual SourceRange getSourceRange() const { 819 // FIXME: Init should never be null. 820 if (!Init) 821 return SourceRange(); 822 if (LParenLoc.isInvalid()) 823 return Init->getSourceRange(); 824 return SourceRange(LParenLoc, Init->getLocEnd()); 825 } 826 827 static bool classof(const Stmt *T) { 828 return T->getStmtClass() == CompoundLiteralExprClass; 829 } 830 static bool classof(const CompoundLiteralExpr *) { return true; } 831 832 // Iterators 833 virtual child_iterator child_begin(); 834 virtual child_iterator child_end(); 835 836 virtual void EmitImpl(llvm::Serializer& S) const; 837 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 838}; 839 840/// CastExpr - Base class for Cast Operators (explicit, implicit, etc.). 841/// Classes that derive from CastExpr are: 842/// 843/// ImplicitCastExpr 844/// ExplicitCastExpr 845/// 846class CastExpr : public Expr { 847 Stmt *Op; 848protected: 849 CastExpr(StmtClass SC, QualType ty, Expr *op) : 850 Expr(SC, ty), Op(op) {} 851 852public: 853 Expr *getSubExpr() { return cast<Expr>(Op); } 854 const Expr *getSubExpr() const { return cast<Expr>(Op); } 855 856 static bool classof(const Stmt *T) { 857 switch (T->getStmtClass()) { 858 case ImplicitCastExprClass: 859 case ExplicitCastExprClass: 860 case CXXFunctionalCastExprClass: 861 return true; 862 default: 863 return false; 864 } 865 } 866 static bool classof(const CastExpr *) { return true; } 867 868 // Iterators 869 virtual child_iterator child_begin(); 870 virtual child_iterator child_end(); 871}; 872 873/// ImplicitCastExpr - Allows us to explicitly represent implicit type 874/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 875/// float->double, short->int, etc. 876/// 877class ImplicitCastExpr : public CastExpr { 878public: 879 ImplicitCastExpr(QualType ty, Expr *op) : 880 CastExpr(ImplicitCastExprClass, ty, op) {} 881 882 virtual SourceRange getSourceRange() const { 883 return getSubExpr()->getSourceRange(); 884 } 885 886 static bool classof(const Stmt *T) { 887 return T->getStmtClass() == ImplicitCastExprClass; 888 } 889 static bool classof(const ImplicitCastExpr *) { return true; } 890 891 virtual void EmitImpl(llvm::Serializer& S) const; 892 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 893}; 894 895/// ExplicitCastExpr - [C99 6.5.4] Cast Operators. 896/// 897class ExplicitCastExpr : public CastExpr { 898 SourceLocation Loc; // the location of the left paren 899public: 900 ExplicitCastExpr(QualType ty, Expr *op, SourceLocation l) : 901 CastExpr(ExplicitCastExprClass, ty, op), Loc(l) {} 902 903 SourceLocation getLParenLoc() const { return Loc; } 904 905 virtual SourceRange getSourceRange() const { 906 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 907 } 908 static bool classof(const Stmt *T) { 909 return T->getStmtClass() == ExplicitCastExprClass; 910 } 911 static bool classof(const ExplicitCastExpr *) { return true; } 912 913 virtual void EmitImpl(llvm::Serializer& S) const; 914 static ExplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 915}; 916 917class BinaryOperator : public Expr { 918public: 919 enum Opcode { 920 // Operators listed in order of precedence. 921 // Note that additions to this should also update the StmtVisitor class. 922 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 923 Add, Sub, // [C99 6.5.6] Additive operators. 924 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 925 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 926 EQ, NE, // [C99 6.5.9] Equality operators. 927 And, // [C99 6.5.10] Bitwise AND operator. 928 Xor, // [C99 6.5.11] Bitwise XOR operator. 929 Or, // [C99 6.5.12] Bitwise OR operator. 930 LAnd, // [C99 6.5.13] Logical AND operator. 931 LOr, // [C99 6.5.14] Logical OR operator. 932 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 933 DivAssign, RemAssign, 934 AddAssign, SubAssign, 935 ShlAssign, ShrAssign, 936 AndAssign, XorAssign, 937 OrAssign, 938 Comma // [C99 6.5.17] Comma operator. 939 }; 940private: 941 enum { LHS, RHS, END_EXPR }; 942 Stmt* SubExprs[END_EXPR]; 943 Opcode Opc; 944 SourceLocation OpLoc; 945public: 946 947 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 948 SourceLocation opLoc) 949 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 950 SubExprs[LHS] = lhs; 951 SubExprs[RHS] = rhs; 952 assert(!isCompoundAssignmentOp() && 953 "Use ArithAssignBinaryOperator for compound assignments"); 954 } 955 956 SourceLocation getOperatorLoc() const { return OpLoc; } 957 Opcode getOpcode() const { return Opc; } 958 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 959 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 960 virtual SourceRange getSourceRange() const { 961 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 962 } 963 964 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 965 /// corresponds to, e.g. "<<=". 966 static const char *getOpcodeStr(Opcode Op); 967 968 /// predicates to categorize the respective opcodes. 969 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 970 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 971 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 972 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 973 974 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 975 bool isRelationalOp() const { return isRelationalOp(Opc); } 976 977 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 978 bool isEqualityOp() const { return isEqualityOp(Opc); } 979 980 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 981 bool isLogicalOp() const { return isLogicalOp(Opc); } 982 983 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 984 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 985 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 986 987 static bool classof(const Stmt *S) { 988 return S->getStmtClass() == BinaryOperatorClass || 989 S->getStmtClass() == CompoundAssignOperatorClass; 990 } 991 static bool classof(const BinaryOperator *) { return true; } 992 993 // Iterators 994 virtual child_iterator child_begin(); 995 virtual child_iterator child_end(); 996 997 virtual void EmitImpl(llvm::Serializer& S) const; 998 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 999 1000protected: 1001 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1002 SourceLocation oploc, bool dead) 1003 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1004 SubExprs[LHS] = lhs; 1005 SubExprs[RHS] = rhs; 1006 } 1007}; 1008 1009/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1010/// track of the type the operation is performed in. Due to the semantics of 1011/// these operators, the operands are promoted, the aritmetic performed, an 1012/// implicit conversion back to the result type done, then the assignment takes 1013/// place. This captures the intermediate type which the computation is done 1014/// in. 1015class CompoundAssignOperator : public BinaryOperator { 1016 QualType ComputationType; 1017public: 1018 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1019 QualType ResType, QualType CompType, 1020 SourceLocation OpLoc) 1021 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1022 ComputationType(CompType) { 1023 assert(isCompoundAssignmentOp() && 1024 "Only should be used for compound assignments"); 1025 } 1026 1027 QualType getComputationType() const { return ComputationType; } 1028 1029 static bool classof(const CompoundAssignOperator *) { return true; } 1030 static bool classof(const Stmt *S) { 1031 return S->getStmtClass() == CompoundAssignOperatorClass; 1032 } 1033 1034 virtual void EmitImpl(llvm::Serializer& S) const; 1035 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1036 ASTContext& C); 1037}; 1038 1039/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1040/// GNU "missing LHS" extension is in use. 1041/// 1042class ConditionalOperator : public Expr { 1043 enum { COND, LHS, RHS, END_EXPR }; 1044 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1045public: 1046 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1047 : Expr(ConditionalOperatorClass, t) { 1048 SubExprs[COND] = cond; 1049 SubExprs[LHS] = lhs; 1050 SubExprs[RHS] = rhs; 1051 } 1052 1053 // getCond - Return the expression representing the condition for 1054 // the ?: operator. 1055 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1056 1057 // getTrueExpr - Return the subexpression representing the value of the ?: 1058 // expression if the condition evaluates to true. In most cases this value 1059 // will be the same as getLHS() except a GCC extension allows the left 1060 // subexpression to be omitted, and instead of the condition be returned. 1061 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1062 // is only evaluated once. 1063 Expr *getTrueExpr() const { 1064 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1065 } 1066 1067 // getTrueExpr - Return the subexpression representing the value of the ?: 1068 // expression if the condition evaluates to false. This is the same as getRHS. 1069 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1070 1071 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1072 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1073 1074 virtual SourceRange getSourceRange() const { 1075 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1076 } 1077 static bool classof(const Stmt *T) { 1078 return T->getStmtClass() == ConditionalOperatorClass; 1079 } 1080 static bool classof(const ConditionalOperator *) { return true; } 1081 1082 // Iterators 1083 virtual child_iterator child_begin(); 1084 virtual child_iterator child_end(); 1085 1086 virtual void EmitImpl(llvm::Serializer& S) const; 1087 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1088}; 1089 1090/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1091class AddrLabelExpr : public Expr { 1092 SourceLocation AmpAmpLoc, LabelLoc; 1093 LabelStmt *Label; 1094public: 1095 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1096 QualType t) 1097 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1098 1099 virtual SourceRange getSourceRange() const { 1100 return SourceRange(AmpAmpLoc, LabelLoc); 1101 } 1102 1103 LabelStmt *getLabel() const { return Label; } 1104 1105 static bool classof(const Stmt *T) { 1106 return T->getStmtClass() == AddrLabelExprClass; 1107 } 1108 static bool classof(const AddrLabelExpr *) { return true; } 1109 1110 // Iterators 1111 virtual child_iterator child_begin(); 1112 virtual child_iterator child_end(); 1113 1114 virtual void EmitImpl(llvm::Serializer& S) const; 1115 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1116}; 1117 1118/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1119/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1120/// takes the value of the last subexpression. 1121class StmtExpr : public Expr { 1122 Stmt *SubStmt; 1123 SourceLocation LParenLoc, RParenLoc; 1124public: 1125 StmtExpr(CompoundStmt *substmt, QualType T, 1126 SourceLocation lp, SourceLocation rp) : 1127 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1128 1129 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1130 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1131 1132 virtual SourceRange getSourceRange() const { 1133 return SourceRange(LParenLoc, RParenLoc); 1134 } 1135 1136 static bool classof(const Stmt *T) { 1137 return T->getStmtClass() == StmtExprClass; 1138 } 1139 static bool classof(const StmtExpr *) { return true; } 1140 1141 // Iterators 1142 virtual child_iterator child_begin(); 1143 virtual child_iterator child_end(); 1144 1145 virtual void EmitImpl(llvm::Serializer& S) const; 1146 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1147}; 1148 1149/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1150/// This AST node represents a function that returns 1 if two *types* (not 1151/// expressions) are compatible. The result of this built-in function can be 1152/// used in integer constant expressions. 1153class TypesCompatibleExpr : public Expr { 1154 QualType Type1; 1155 QualType Type2; 1156 SourceLocation BuiltinLoc, RParenLoc; 1157public: 1158 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1159 QualType t1, QualType t2, SourceLocation RP) : 1160 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1161 BuiltinLoc(BLoc), RParenLoc(RP) {} 1162 1163 QualType getArgType1() const { return Type1; } 1164 QualType getArgType2() const { return Type2; } 1165 1166 virtual SourceRange getSourceRange() const { 1167 return SourceRange(BuiltinLoc, RParenLoc); 1168 } 1169 static bool classof(const Stmt *T) { 1170 return T->getStmtClass() == TypesCompatibleExprClass; 1171 } 1172 static bool classof(const TypesCompatibleExpr *) { return true; } 1173 1174 // Iterators 1175 virtual child_iterator child_begin(); 1176 virtual child_iterator child_end(); 1177}; 1178 1179/// ShuffleVectorExpr - clang-specific builtin-in function 1180/// __builtin_shufflevector. 1181/// This AST node represents a operator that does a constant 1182/// shuffle, similar to LLVM's shufflevector instruction. It takes 1183/// two vectors and a variable number of constant indices, 1184/// and returns the appropriately shuffled vector. 1185class ShuffleVectorExpr : public Expr { 1186 SourceLocation BuiltinLoc, RParenLoc; 1187 1188 // SubExprs - the list of values passed to the __builtin_shufflevector 1189 // function. The first two are vectors, and the rest are constant 1190 // indices. The number of values in this list is always 1191 // 2+the number of indices in the vector type. 1192 Stmt **SubExprs; 1193 unsigned NumExprs; 1194 1195public: 1196 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1197 QualType Type, SourceLocation BLoc, 1198 SourceLocation RP) : 1199 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1200 RParenLoc(RP), NumExprs(nexpr) { 1201 1202 SubExprs = new Stmt*[nexpr]; 1203 for (unsigned i = 0; i < nexpr; i++) 1204 SubExprs[i] = args[i]; 1205 } 1206 1207 virtual SourceRange getSourceRange() const { 1208 return SourceRange(BuiltinLoc, RParenLoc); 1209 } 1210 static bool classof(const Stmt *T) { 1211 return T->getStmtClass() == ShuffleVectorExprClass; 1212 } 1213 static bool classof(const ShuffleVectorExpr *) { return true; } 1214 1215 ~ShuffleVectorExpr() { 1216 delete [] SubExprs; 1217 } 1218 1219 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1220 /// constant expression, the actual arguments passed in, and the function 1221 /// pointers. 1222 unsigned getNumSubExprs() const { return NumExprs; } 1223 1224 /// getExpr - Return the Expr at the specified index. 1225 Expr *getExpr(unsigned Index) { 1226 assert((Index < NumExprs) && "Arg access out of range!"); 1227 return cast<Expr>(SubExprs[Index]); 1228 } 1229 const Expr *getExpr(unsigned Index) const { 1230 assert((Index < NumExprs) && "Arg access out of range!"); 1231 return cast<Expr>(SubExprs[Index]); 1232 } 1233 1234 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1235 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1236 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1237 } 1238 1239 // Iterators 1240 virtual child_iterator child_begin(); 1241 virtual child_iterator child_end(); 1242}; 1243 1244/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1245/// This AST node is similar to the conditional operator (?:) in C, with 1246/// the following exceptions: 1247/// - the test expression much be a constant expression. 1248/// - the expression returned has it's type unaltered by promotion rules. 1249/// - does not evaluate the expression that was not chosen. 1250class ChooseExpr : public Expr { 1251 enum { COND, LHS, RHS, END_EXPR }; 1252 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1253 SourceLocation BuiltinLoc, RParenLoc; 1254public: 1255 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1256 SourceLocation RP) 1257 : Expr(ChooseExprClass, t), 1258 BuiltinLoc(BLoc), RParenLoc(RP) { 1259 SubExprs[COND] = cond; 1260 SubExprs[LHS] = lhs; 1261 SubExprs[RHS] = rhs; 1262 } 1263 1264 /// isConditionTrue - Return true if the condition is true. This is always 1265 /// statically knowable for a well-formed choosexpr. 1266 bool isConditionTrue(ASTContext &C) const; 1267 1268 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1269 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1270 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1271 1272 virtual SourceRange getSourceRange() const { 1273 return SourceRange(BuiltinLoc, RParenLoc); 1274 } 1275 static bool classof(const Stmt *T) { 1276 return T->getStmtClass() == ChooseExprClass; 1277 } 1278 static bool classof(const ChooseExpr *) { return true; } 1279 1280 // Iterators 1281 virtual child_iterator child_begin(); 1282 virtual child_iterator child_end(); 1283}; 1284 1285/// OverloadExpr - Clang builtin function __builtin_overload. 1286/// This AST node provides a way to overload functions in C. 1287/// 1288/// The first argument is required to be a constant expression, for the number 1289/// of arguments passed to each candidate function. 1290/// 1291/// The next N arguments, where N is the value of the constant expression, 1292/// are the values to be passed as arguments. 1293/// 1294/// The rest of the arguments are values of pointer to function type, which 1295/// are the candidate functions for overloading. 1296/// 1297/// The result is a equivalent to a CallExpr taking N arguments to the 1298/// candidate function whose parameter types match the types of the N arguments. 1299/// 1300/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1301/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1302/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1303class OverloadExpr : public Expr { 1304 // SubExprs - the list of values passed to the __builtin_overload function. 1305 // SubExpr[0] is a constant expression 1306 // SubExpr[1-N] are the parameters to pass to the matching function call 1307 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1308 Stmt **SubExprs; 1309 1310 // NumExprs - the size of the SubExprs array 1311 unsigned NumExprs; 1312 1313 // The index of the matching candidate function 1314 unsigned FnIndex; 1315 1316 SourceLocation BuiltinLoc; 1317 SourceLocation RParenLoc; 1318public: 1319 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1320 SourceLocation bloc, SourceLocation rploc) 1321 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1322 BuiltinLoc(bloc), RParenLoc(rploc) { 1323 SubExprs = new Stmt*[nexprs]; 1324 for (unsigned i = 0; i != nexprs; ++i) 1325 SubExprs[i] = args[i]; 1326 } 1327 ~OverloadExpr() { 1328 delete [] SubExprs; 1329 } 1330 1331 /// arg_begin - Return a pointer to the list of arguments that will be passed 1332 /// to the matching candidate function, skipping over the initial constant 1333 /// expression. 1334 typedef ConstExprIterator const_arg_iterator; 1335 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1336 const_arg_iterator arg_end(ASTContext& Ctx) const { 1337 return &SubExprs[0]+1+getNumArgs(Ctx); 1338 } 1339 1340 /// getNumArgs - Return the number of arguments to pass to the candidate 1341 /// functions. 1342 unsigned getNumArgs(ASTContext &Ctx) const { 1343 return getExpr(0)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1344 } 1345 1346 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1347 /// constant expression, the actual arguments passed in, and the function 1348 /// pointers. 1349 unsigned getNumSubExprs() const { return NumExprs; } 1350 1351 /// getExpr - Return the Expr at the specified index. 1352 Expr *getExpr(unsigned Index) const { 1353 assert((Index < NumExprs) && "Arg access out of range!"); 1354 return cast<Expr>(SubExprs[Index]); 1355 } 1356 1357 /// getFn - Return the matching candidate function for this OverloadExpr. 1358 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1359 1360 virtual SourceRange getSourceRange() const { 1361 return SourceRange(BuiltinLoc, RParenLoc); 1362 } 1363 static bool classof(const Stmt *T) { 1364 return T->getStmtClass() == OverloadExprClass; 1365 } 1366 static bool classof(const OverloadExpr *) { return true; } 1367 1368 // Iterators 1369 virtual child_iterator child_begin(); 1370 virtual child_iterator child_end(); 1371}; 1372 1373/// VAArgExpr, used for the builtin function __builtin_va_start. 1374class VAArgExpr : public Expr { 1375 Stmt *Val; 1376 SourceLocation BuiltinLoc, RParenLoc; 1377public: 1378 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1379 : Expr(VAArgExprClass, t), 1380 Val(e), 1381 BuiltinLoc(BLoc), 1382 RParenLoc(RPLoc) { } 1383 1384 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1385 Expr *getSubExpr() { return cast<Expr>(Val); } 1386 virtual SourceRange getSourceRange() const { 1387 return SourceRange(BuiltinLoc, RParenLoc); 1388 } 1389 static bool classof(const Stmt *T) { 1390 return T->getStmtClass() == VAArgExprClass; 1391 } 1392 static bool classof(const VAArgExpr *) { return true; } 1393 1394 // Iterators 1395 virtual child_iterator child_begin(); 1396 virtual child_iterator child_end(); 1397}; 1398 1399/// InitListExpr - used for struct and array initializers, such as: 1400/// struct foo x = { 1, { 2, 3 } }; 1401/// 1402/// Because C is somewhat loose with braces, the AST does not necessarily 1403/// directly model the C source. Instead, the semantic analyzer aims to make 1404/// the InitListExprs match up with the type of the decl being initialized. We 1405/// have the following exceptions: 1406/// 1407/// 1. Elements at the end of the list may be dropped from the initializer. 1408/// These elements are defined to be initialized to zero. For example: 1409/// int x[20] = { 1 }; 1410/// 2. Initializers may have excess initializers which are to be ignored by the 1411/// compiler. For example: 1412/// int x[1] = { 1, 2 }; 1413/// 3. Redundant InitListExprs may be present around scalar elements. These 1414/// always have a single element whose type is the same as the InitListExpr. 1415/// this can only happen for Type::isScalarType() types. 1416/// int x = { 1 }; int y[2] = { {1}, {2} }; 1417/// 1418class InitListExpr : public Expr { 1419 std::vector<Stmt *> InitExprs; 1420 SourceLocation LBraceLoc, RBraceLoc; 1421public: 1422 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1423 SourceLocation rbraceloc); 1424 1425 unsigned getNumInits() const { return InitExprs.size(); } 1426 1427 const Expr* getInit(unsigned Init) const { 1428 assert(Init < getNumInits() && "Initializer access out of range!"); 1429 return cast<Expr>(InitExprs[Init]); 1430 } 1431 1432 Expr* getInit(unsigned Init) { 1433 assert(Init < getNumInits() && "Initializer access out of range!"); 1434 return cast<Expr>(InitExprs[Init]); 1435 } 1436 1437 void setInit(unsigned Init, Expr *expr) { 1438 assert(Init < getNumInits() && "Initializer access out of range!"); 1439 InitExprs[Init] = expr; 1440 } 1441 1442 // Dynamic removal/addition (for constructing implicit InitExpr's). 1443 void removeInit(unsigned Init) { 1444 InitExprs.erase(InitExprs.begin()+Init); 1445 } 1446 void addInit(unsigned Init, Expr *expr) { 1447 InitExprs.insert(InitExprs.begin()+Init, expr); 1448 } 1449 1450 // Explicit InitListExpr's originate from source code (and have valid source 1451 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1452 bool isExplicit() { 1453 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1454 } 1455 1456 virtual SourceRange getSourceRange() const { 1457 return SourceRange(LBraceLoc, RBraceLoc); 1458 } 1459 static bool classof(const Stmt *T) { 1460 return T->getStmtClass() == InitListExprClass; 1461 } 1462 static bool classof(const InitListExpr *) { return true; } 1463 1464 // Iterators 1465 virtual child_iterator child_begin(); 1466 virtual child_iterator child_end(); 1467 1468 virtual void EmitImpl(llvm::Serializer& S) const; 1469 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1470 1471private: 1472 // Used by serializer. 1473 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1474}; 1475 1476} // end namespace clang 1477 1478#endif 1479