Expr.h revision cd8f646eca128f52a7bce0103c51ff82ce96f374
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/Stmt.h" 18#include "clang/AST/Type.h" 19#include "clang/AST/Decl.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/Basic/IdentifierTable.h" 22#include "llvm/ADT/APSInt.h" 23#include "llvm/ADT/APFloat.h" 24#include "llvm/ADT/SmallVector.h" 25#include <vector> 26 27namespace clang { 28 class IdentifierInfo; 29 class Selector; 30 class Decl; 31 class ASTContext; 32 class APValue; 33 34/// Expr - This represents one expression. Note that Expr's are subclasses of 35/// Stmt. This allows an expression to be transparently used any place a Stmt 36/// is required. 37/// 38class Expr : public Stmt { 39 QualType TR; 40protected: 41 Expr(StmtClass SC, QualType T) : Stmt(SC), TR(T) {} 42public: 43 QualType getType() const { return TR; } 44 void setType(QualType t) { TR = t; } 45 46 /// SourceLocation tokens are not useful in isolation - they are low level 47 /// value objects created/interpreted by SourceManager. We assume AST 48 /// clients will have a pointer to the respective SourceManager. 49 virtual SourceRange getSourceRange() const = 0; 50 51 /// getExprLoc - Return the preferred location for the arrow when diagnosing 52 /// a problem with a generic expression. 53 virtual SourceLocation getExprLoc() const { return getLocStart(); } 54 55 /// hasLocalSideEffect - Return true if this immediate expression has side 56 /// effects, not counting any sub-expressions. 57 bool hasLocalSideEffect() const; 58 59 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 60 /// incomplete type other than void. Nonarray expressions that can be lvalues: 61 /// - name, where name must be a variable 62 /// - e[i] 63 /// - (e), where e must be an lvalue 64 /// - e.name, where e must be an lvalue 65 /// - e->name 66 /// - *e, the type of e cannot be a function type 67 /// - string-constant 68 /// - reference type [C++ [expr]] 69 /// 70 enum isLvalueResult { 71 LV_Valid, 72 LV_NotObjectType, 73 LV_IncompleteVoidType, 74 LV_DuplicateVectorComponents, 75 LV_InvalidExpression 76 }; 77 isLvalueResult isLvalue() const; 78 79 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 80 /// does not have an incomplete type, does not have a const-qualified type, 81 /// and if it is a structure or union, does not have any member (including, 82 /// recursively, any member or element of all contained aggregates or unions) 83 /// with a const-qualified type. 84 enum isModifiableLvalueResult { 85 MLV_Valid, 86 MLV_NotObjectType, 87 MLV_IncompleteVoidType, 88 MLV_DuplicateVectorComponents, 89 MLV_InvalidExpression, 90 MLV_IncompleteType, 91 MLV_ConstQualified, 92 MLV_ArrayType 93 }; 94 isModifiableLvalueResult isModifiableLvalue() const; 95 96 bool isNullPointerConstant(ASTContext &Ctx) const; 97 98 /// getIntegerConstantExprValue() - Return the value of an integer 99 /// constant expression. The expression must be a valid integer 100 /// constant expression as determined by isIntegerConstantExpr. 101 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 102 llvm::APSInt X(32); 103 bool success = isIntegerConstantExpr(X, Ctx); 104 assert(success && "Illegal argument to getIntegerConstantExpr"); 105 return X; 106 } 107 108 /// isIntegerConstantExpr - Return true if this expression is a valid integer 109 /// constant expression, and, if so, return its value in Result. If not a 110 /// valid i-c-e, return false and fill in Loc (if specified) with the location 111 /// of the invalid expression. 112 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 113 SourceLocation *Loc = 0, 114 bool isEvaluated = true) const; 115 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 116 llvm::APSInt X(32); 117 return isIntegerConstantExpr(X, Ctx, Loc); 118 } 119 /// isConstantExpr - Return true if this expression is a valid constant expr. 120 bool isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const; 121 122 bool tryEvaluate(APValue& Result, ASTContext &Ctx) const; 123 124 /// hasGlobalStorage - Return true if this expression has static storage 125 /// duration. This means that the address of this expression is a link-time 126 /// constant. 127 bool hasGlobalStorage() const; 128 129 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 130 /// its subexpression. If that subexpression is also a ParenExpr, 131 /// then this method recursively returns its subexpression, and so forth. 132 /// Otherwise, the method returns the current Expr. 133 Expr* IgnoreParens(); 134 135 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 136 /// or CastExprs or ImplicitCastExprs, returning their operand. 137 Expr *IgnoreParenCasts(); 138 139 const Expr* IgnoreParens() const { 140 return const_cast<Expr*>(this)->IgnoreParens(); 141 } 142 const Expr *IgnoreParenCasts() const { 143 return const_cast<Expr*>(this)->IgnoreParenCasts(); 144 } 145 146 static bool classof(const Stmt *T) { 147 return T->getStmtClass() >= firstExprConstant && 148 T->getStmtClass() <= lastExprConstant; 149 } 150 static bool classof(const Expr *) { return true; } 151 152 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 153 return cast<Expr>(Stmt::Create(D, C)); 154 } 155}; 156 157//===----------------------------------------------------------------------===// 158// ExprIterator - Iterators for iterating over Stmt* arrays that contain 159// only Expr*. This is needed because AST nodes use Stmt* arrays to store 160// references to children (to be compatible with StmtIterator). 161//===----------------------------------------------------------------------===// 162 163class ExprIterator { 164 Stmt** I; 165public: 166 ExprIterator(Stmt** i) : I(i) {} 167 ExprIterator() : I(0) {} 168 ExprIterator& operator++() { ++I; return *this; } 169 ExprIterator operator-(size_t i) { return I-i; } 170 ExprIterator operator+(size_t i) { return I+i; } 171 Expr* operator[](size_t idx) { return cast<Expr>(I[idx]); } 172 // FIXME: Verify that this will correctly return a signed distance. 173 signed operator-(const ExprIterator& R) const { return I - R.I; } 174 Expr* operator*() const { return cast<Expr>(*I); } 175 Expr* operator->() const { return cast<Expr>(*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 bool operator>=(const ExprIterator& R) const { return I >= R.I; } 180}; 181 182class ConstExprIterator { 183 Stmt* const * I; 184public: 185 ConstExprIterator(Stmt* const* i) : I(i) {} 186 ConstExprIterator() : I(0) {} 187 ConstExprIterator& operator++() { ++I; return *this; } 188 ConstExprIterator operator+(size_t i) { return I+i; } 189 ConstExprIterator operator-(size_t i) { return I-i; } 190 Expr * operator[](size_t idx) const { return cast<Expr>(I[idx]); } 191 signed operator-(const ConstExprIterator& R) const { return I - R.I; } 192 Expr * operator*() const { return cast<Expr>(*I); } 193 Expr * operator->() const { return cast<Expr>(*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 bool operator>=(const ConstExprIterator& R) const { return I >= R.I; } 198}; 199 200 201//===----------------------------------------------------------------------===// 202// Primary Expressions. 203//===----------------------------------------------------------------------===// 204 205/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 206/// enum, etc. 207class DeclRefExpr : public Expr { 208 ValueDecl *D; 209 SourceLocation Loc; 210public: 211 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 212 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 213 214 ValueDecl *getDecl() { return D; } 215 const ValueDecl *getDecl() const { return D; } 216 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 217 218 219 static bool classof(const Stmt *T) { 220 return T->getStmtClass() == DeclRefExprClass; 221 } 222 static bool classof(const DeclRefExpr *) { return true; } 223 224 // Iterators 225 virtual child_iterator child_begin(); 226 virtual child_iterator child_end(); 227 228 virtual void EmitImpl(llvm::Serializer& S) const; 229 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 230}; 231 232/// PreDefinedExpr - [C99 6.4.2.2] - A pre-defined identifier such as __func__. 233class PreDefinedExpr : public Expr { 234public: 235 enum IdentType { 236 Func, 237 Function, 238 PrettyFunction, 239 CXXThis, 240 ObjCSuper // super 241 }; 242 243private: 244 SourceLocation Loc; 245 IdentType Type; 246public: 247 PreDefinedExpr(SourceLocation l, QualType type, IdentType IT) 248 : Expr(PreDefinedExprClass, type), Loc(l), Type(IT) {} 249 250 IdentType getIdentType() const { return Type; } 251 252 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 253 254 static bool classof(const Stmt *T) { 255 return T->getStmtClass() == PreDefinedExprClass; 256 } 257 static bool classof(const PreDefinedExpr *) { return true; } 258 259 // Iterators 260 virtual child_iterator child_begin(); 261 virtual child_iterator child_end(); 262 263 virtual void EmitImpl(llvm::Serializer& S) const; 264 static PreDefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 265}; 266 267class IntegerLiteral : public Expr { 268 llvm::APInt Value; 269 SourceLocation Loc; 270public: 271 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 272 // or UnsignedLongLongTy 273 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 274 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 275 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 276 } 277 const llvm::APInt &getValue() const { return Value; } 278 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 279 280 static bool classof(const Stmt *T) { 281 return T->getStmtClass() == IntegerLiteralClass; 282 } 283 static bool classof(const IntegerLiteral *) { return true; } 284 285 // Iterators 286 virtual child_iterator child_begin(); 287 virtual child_iterator child_end(); 288 289 virtual void EmitImpl(llvm::Serializer& S) const; 290 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 291}; 292 293class CharacterLiteral : public Expr { 294 unsigned Value; 295 SourceLocation Loc; 296 bool IsWide; 297public: 298 // type should be IntTy 299 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 300 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 301 } 302 SourceLocation getLoc() const { return Loc; } 303 bool isWide() const { return IsWide; } 304 305 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 306 307 unsigned getValue() const { return Value; } 308 309 static bool classof(const Stmt *T) { 310 return T->getStmtClass() == CharacterLiteralClass; 311 } 312 static bool classof(const CharacterLiteral *) { return true; } 313 314 // Iterators 315 virtual child_iterator child_begin(); 316 virtual child_iterator child_end(); 317 318 virtual void EmitImpl(llvm::Serializer& S) const; 319 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 320}; 321 322class FloatingLiteral : public Expr { 323 llvm::APFloat Value; 324 bool IsExact : 1; 325 SourceLocation Loc; 326public: 327 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 328 QualType Type, SourceLocation L) 329 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 330 331 const llvm::APFloat &getValue() const { return Value; } 332 333 bool isExact() const { return IsExact; } 334 335 /// getValueAsApproximateDouble - This returns the value as an inaccurate 336 /// double. Note that this may cause loss of precision, but is useful for 337 /// debugging dumps, etc. 338 double getValueAsApproximateDouble() const; 339 340 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 341 342 static bool classof(const Stmt *T) { 343 return T->getStmtClass() == FloatingLiteralClass; 344 } 345 static bool classof(const FloatingLiteral *) { return true; } 346 347 // Iterators 348 virtual child_iterator child_begin(); 349 virtual child_iterator child_end(); 350 351 virtual void EmitImpl(llvm::Serializer& S) const; 352 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 353}; 354 355/// ImaginaryLiteral - We support imaginary integer and floating point literals, 356/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 357/// IntegerLiteral classes. Instances of this class always have a Complex type 358/// whose element type matches the subexpression. 359/// 360class ImaginaryLiteral : public Expr { 361 Stmt *Val; 362public: 363 ImaginaryLiteral(Expr *val, QualType Ty) 364 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 365 366 const Expr *getSubExpr() const { return cast<Expr>(Val); } 367 Expr *getSubExpr() { return cast<Expr>(Val); } 368 369 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 370 static bool classof(const Stmt *T) { 371 return T->getStmtClass() == ImaginaryLiteralClass; 372 } 373 static bool classof(const ImaginaryLiteral *) { return true; } 374 375 // Iterators 376 virtual child_iterator child_begin(); 377 virtual child_iterator child_end(); 378 379 virtual void EmitImpl(llvm::Serializer& S) const; 380 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 381}; 382 383/// StringLiteral - This represents a string literal expression, e.g. "foo" 384/// or L"bar" (wide strings). The actual string is returned by getStrData() 385/// is NOT null-terminated, and the length of the string is determined by 386/// calling getByteLength(). The C type for a string is always a 387/// ConstantArrayType. 388class StringLiteral : public Expr { 389 const char *StrData; 390 unsigned ByteLength; 391 bool IsWide; 392 // if the StringLiteral was composed using token pasting, both locations 393 // are needed. If not (the common case), firstTokLoc == lastTokLoc. 394 // FIXME: if space becomes an issue, we should create a sub-class. 395 SourceLocation firstTokLoc, lastTokLoc; 396public: 397 StringLiteral(const char *strData, unsigned byteLength, bool Wide, 398 QualType t, SourceLocation b, SourceLocation e); 399 virtual ~StringLiteral(); 400 401 const char *getStrData() const { return StrData; } 402 unsigned getByteLength() const { return ByteLength; } 403 bool isWide() const { return IsWide; } 404 405 virtual SourceRange getSourceRange() const { 406 return SourceRange(firstTokLoc,lastTokLoc); 407 } 408 static bool classof(const Stmt *T) { 409 return T->getStmtClass() == StringLiteralClass; 410 } 411 static bool classof(const StringLiteral *) { return true; } 412 413 // Iterators 414 virtual child_iterator child_begin(); 415 virtual child_iterator child_end(); 416 417 virtual void EmitImpl(llvm::Serializer& S) const; 418 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 419}; 420 421/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 422/// AST node is only formed if full location information is requested. 423class ParenExpr : public Expr { 424 SourceLocation L, R; 425 Stmt *Val; 426public: 427 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 428 : Expr(ParenExprClass, val->getType()), L(l), R(r), Val(val) {} 429 430 const Expr *getSubExpr() const { return cast<Expr>(Val); } 431 Expr *getSubExpr() { return cast<Expr>(Val); } 432 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 433 434 static bool classof(const Stmt *T) { 435 return T->getStmtClass() == ParenExprClass; 436 } 437 static bool classof(const ParenExpr *) { return true; } 438 439 // Iterators 440 virtual child_iterator child_begin(); 441 virtual child_iterator child_end(); 442 443 virtual void EmitImpl(llvm::Serializer& S) const; 444 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 445}; 446 447 448/// UnaryOperator - This represents the unary-expression's (except sizeof of 449/// types), the postinc/postdec operators from postfix-expression, and various 450/// extensions. 451/// 452/// Notes on various nodes: 453/// 454/// Real/Imag - These return the real/imag part of a complex operand. If 455/// applied to a non-complex value, the former returns its operand and the 456/// later returns zero in the type of the operand. 457/// 458/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 459/// subexpression is a compound literal with the various MemberExpr and 460/// ArraySubscriptExpr's applied to it. 461/// 462class UnaryOperator : public Expr { 463public: 464 // Note that additions to this should also update the StmtVisitor class. 465 enum Opcode { 466 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 467 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 468 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 469 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 470 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 471 SizeOf, AlignOf, // [C99 6.5.3.4] Sizeof (expr, not type) operator. 472 Real, Imag, // "__real expr"/"__imag expr" Extension. 473 Extension, // __extension__ marker. 474 OffsetOf // __builtin_offsetof 475 }; 476private: 477 Stmt *Val; 478 Opcode Opc; 479 SourceLocation Loc; 480public: 481 482 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 483 : Expr(UnaryOperatorClass, type), Val(input), Opc(opc), Loc(l) {} 484 485 Opcode getOpcode() const { return Opc; } 486 Expr *getSubExpr() const { return cast<Expr>(Val); } 487 488 /// getOperatorLoc - Return the location of the operator. 489 SourceLocation getOperatorLoc() const { return Loc; } 490 491 /// isPostfix - Return true if this is a postfix operation, like x++. 492 static bool isPostfix(Opcode Op); 493 494 /// isPostfix - Return true if this is a prefix operation, like --x. 495 static bool isPrefix(Opcode Op); 496 497 bool isPrefix() const { return isPrefix(Opc); } 498 bool isPostfix() const { return isPostfix(Opc); } 499 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 500 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 501 bool isSizeOfAlignOfOp() const { return Opc == SizeOf || Opc == AlignOf; } 502 bool isOffsetOfOp() const { return Opc == OffsetOf; } 503 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 504 505 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 506 /// corresponds to, e.g. "sizeof" or "[pre]++" 507 static const char *getOpcodeStr(Opcode Op); 508 509 virtual SourceRange getSourceRange() const { 510 if (isPostfix()) 511 return SourceRange(Val->getLocStart(), Loc); 512 else 513 return SourceRange(Loc, Val->getLocEnd()); 514 } 515 virtual SourceLocation getExprLoc() const { return Loc; } 516 517 static bool classof(const Stmt *T) { 518 return T->getStmtClass() == UnaryOperatorClass; 519 } 520 static bool classof(const UnaryOperator *) { return true; } 521 522 int64_t evaluateOffsetOf(ASTContext& C) const; 523 524 // Iterators 525 virtual child_iterator child_begin(); 526 virtual child_iterator child_end(); 527 528 virtual void EmitImpl(llvm::Serializer& S) const; 529 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 530}; 531 532/// SizeOfAlignOfTypeExpr - [C99 6.5.3.4] - This is only for sizeof/alignof of 533/// *types*. sizeof(expr) is handled by UnaryOperator. 534class SizeOfAlignOfTypeExpr : public Expr { 535 bool isSizeof; // true if sizeof, false if alignof. 536 QualType Ty; 537 SourceLocation OpLoc, RParenLoc; 538public: 539 SizeOfAlignOfTypeExpr(bool issizeof, QualType argType, QualType resultType, 540 SourceLocation op, SourceLocation rp) : 541 Expr(SizeOfAlignOfTypeExprClass, resultType), 542 isSizeof(issizeof), Ty(argType), OpLoc(op), RParenLoc(rp) {} 543 544 bool isSizeOf() const { return isSizeof; } 545 QualType getArgumentType() const { return Ty; } 546 547 SourceLocation getOperatorLoc() const { return OpLoc; } 548 549 virtual SourceRange getSourceRange() const { 550 return SourceRange(OpLoc, RParenLoc); 551 } 552 553 static bool classof(const Stmt *T) { 554 return T->getStmtClass() == SizeOfAlignOfTypeExprClass; 555 } 556 static bool classof(const SizeOfAlignOfTypeExpr *) { return true; } 557 558 // Iterators 559 virtual child_iterator child_begin(); 560 virtual child_iterator child_end(); 561 562 virtual void EmitImpl(llvm::Serializer& S) const; 563 static SizeOfAlignOfTypeExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 564}; 565 566//===----------------------------------------------------------------------===// 567// Postfix Operators. 568//===----------------------------------------------------------------------===// 569 570/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 571class ArraySubscriptExpr : public Expr { 572 enum { LHS, RHS, END_EXPR=2 }; 573 Stmt* SubExprs[END_EXPR]; 574 SourceLocation RBracketLoc; 575public: 576 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 577 SourceLocation rbracketloc) 578 : Expr(ArraySubscriptExprClass, t), RBracketLoc(rbracketloc) { 579 SubExprs[LHS] = lhs; 580 SubExprs[RHS] = rhs; 581 } 582 583 /// An array access can be written A[4] or 4[A] (both are equivalent). 584 /// - getBase() and getIdx() always present the normalized view: A[4]. 585 /// In this case getBase() returns "A" and getIdx() returns "4". 586 /// - getLHS() and getRHS() present the syntactic view. e.g. for 587 /// 4[A] getLHS() returns "4". 588 /// Note: Because vector element access is also written A[4] we must 589 /// predicate the format conversion in getBase and getIdx only on the 590 /// the type of the RHS, as it is possible for the LHS to be a vector of 591 /// integer type 592 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 593 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 594 595 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 596 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 597 598 Expr *getBase() { 599 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 600 } 601 602 const Expr *getBase() const { 603 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 604 } 605 606 Expr *getIdx() { 607 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 608 } 609 610 const Expr *getIdx() const { 611 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 612 } 613 614 virtual SourceRange getSourceRange() const { 615 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 616 } 617 618 virtual SourceLocation getExprLoc() const { return RBracketLoc; } 619 620 static bool classof(const Stmt *T) { 621 return T->getStmtClass() == ArraySubscriptExprClass; 622 } 623 static bool classof(const ArraySubscriptExpr *) { return true; } 624 625 // Iterators 626 virtual child_iterator child_begin(); 627 virtual child_iterator child_end(); 628 629 virtual void EmitImpl(llvm::Serializer& S) const; 630 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 631}; 632 633 634/// CallExpr - [C99 6.5.2.2] Function Calls. 635/// 636class CallExpr : public Expr { 637 enum { FN=0, ARGS_START=1 }; 638 Stmt **SubExprs; 639 unsigned NumArgs; 640 SourceLocation RParenLoc; 641 642 // This version of the ctor is for deserialization. 643 CallExpr(Stmt** subexprs, unsigned numargs, QualType t, 644 SourceLocation rparenloc) 645 : Expr(CallExprClass,t), SubExprs(subexprs), 646 NumArgs(numargs), RParenLoc(rparenloc) {} 647 648public: 649 CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 650 SourceLocation rparenloc); 651 ~CallExpr() { 652 delete [] SubExprs; 653 } 654 655 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 656 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 657 void setCallee(Expr *F) { SubExprs[FN] = F; } 658 659 /// getNumArgs - Return the number of actual arguments to this call. 660 /// 661 unsigned getNumArgs() const { return NumArgs; } 662 663 /// getArg - Return the specified argument. 664 Expr *getArg(unsigned Arg) { 665 assert(Arg < NumArgs && "Arg access out of range!"); 666 return cast<Expr>(SubExprs[Arg+ARGS_START]); 667 } 668 const Expr *getArg(unsigned Arg) const { 669 assert(Arg < NumArgs && "Arg access out of range!"); 670 return cast<Expr>(SubExprs[Arg+ARGS_START]); 671 } 672 /// setArg - Set the specified argument. 673 void setArg(unsigned Arg, Expr *ArgExpr) { 674 assert(Arg < NumArgs && "Arg access out of range!"); 675 SubExprs[Arg+ARGS_START] = ArgExpr; 676 } 677 678 /// setNumArgs - This changes the number of arguments present in this call. 679 /// Any orphaned expressions are deleted by this, and any new operands are set 680 /// to null. 681 void setNumArgs(unsigned NumArgs); 682 683 typedef ExprIterator arg_iterator; 684 typedef ConstExprIterator const_arg_iterator; 685 686 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 687 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 688 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 689 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 690 691 /// getNumCommas - Return the number of commas that must have been present in 692 /// this function call. 693 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 694 695 bool isBuiltinClassifyType(llvm::APSInt &Result) const; 696 697 /// isBuiltinConstantExpr - Return true if this built-in call is constant. 698 bool isBuiltinConstantExpr() const; 699 700 SourceLocation getRParenLoc() const { return RParenLoc; } 701 702 virtual SourceRange getSourceRange() const { 703 return SourceRange(getCallee()->getLocStart(), RParenLoc); 704 } 705 706 static bool classof(const Stmt *T) { 707 return T->getStmtClass() == CallExprClass; 708 } 709 static bool classof(const CallExpr *) { return true; } 710 711 // Iterators 712 virtual child_iterator child_begin(); 713 virtual child_iterator child_end(); 714 715 virtual void EmitImpl(llvm::Serializer& S) const; 716 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 717}; 718 719/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. 720/// 721class MemberExpr : public Expr { 722 Stmt *Base; 723 FieldDecl *MemberDecl; 724 SourceLocation MemberLoc; 725 bool IsArrow; // True if this is "X->F", false if this is "X.F". 726public: 727 MemberExpr(Expr *base, bool isarrow, FieldDecl *memberdecl, SourceLocation l, 728 QualType ty) 729 : Expr(MemberExprClass, ty), 730 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 731 732 Expr *getBase() const { return cast<Expr>(Base); } 733 FieldDecl *getMemberDecl() const { return MemberDecl; } 734 bool isArrow() const { return IsArrow; } 735 736 virtual SourceRange getSourceRange() const { 737 return SourceRange(getBase()->getLocStart(), MemberLoc); 738 } 739 740 virtual SourceLocation getExprLoc() const { return MemberLoc; } 741 742 static bool classof(const Stmt *T) { 743 return T->getStmtClass() == MemberExprClass; 744 } 745 static bool classof(const MemberExpr *) { return true; } 746 747 // Iterators 748 virtual child_iterator child_begin(); 749 virtual child_iterator child_end(); 750 751 virtual void EmitImpl(llvm::Serializer& S) const; 752 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 753}; 754 755/// ExtVectorElementExpr - This represents access to specific elements of a 756/// vector, and may occur on the left hand side or right hand side. For example 757/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 758/// 759class ExtVectorElementExpr : public Expr { 760 Stmt *Base; 761 IdentifierInfo &Accessor; 762 SourceLocation AccessorLoc; 763public: 764 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 765 SourceLocation loc) 766 : Expr(ExtVectorElementExprClass, ty), 767 Base(base), Accessor(accessor), AccessorLoc(loc) {} 768 769 const Expr *getBase() const { return cast<Expr>(Base); } 770 Expr *getBase() { return cast<Expr>(Base); } 771 772 IdentifierInfo &getAccessor() const { return Accessor; } 773 774 /// getNumElements - Get the number of components being selected. 775 unsigned getNumElements() const; 776 777 /// containsDuplicateElements - Return true if any element access is 778 /// repeated. 779 bool containsDuplicateElements() const; 780 781 /// getEncodedElementAccess - Encode the elements accessed into an llvm 782 /// aggregate Constant of ConstantInt(s). 783 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 784 785 virtual SourceRange getSourceRange() const { 786 return SourceRange(getBase()->getLocStart(), AccessorLoc); 787 } 788 789 static bool classof(const Stmt *T) { 790 return T->getStmtClass() == ExtVectorElementExprClass; 791 } 792 static bool classof(const ExtVectorElementExpr *) { return true; } 793 794 // Iterators 795 virtual child_iterator child_begin(); 796 virtual child_iterator child_end(); 797}; 798 799/// CompoundLiteralExpr - [C99 6.5.2.5] 800/// 801class CompoundLiteralExpr : public Expr { 802 /// LParenLoc - If non-null, this is the location of the left paren in a 803 /// compound literal like "(int){4}". This can be null if this is a 804 /// synthesized compound expression. 805 SourceLocation LParenLoc; 806 Stmt *Init; 807 bool FileScope; 808public: 809 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, bool fileScope) : 810 Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), FileScope(fileScope) {} 811 812 const Expr *getInitializer() const { return cast<Expr>(Init); } 813 Expr *getInitializer() { return cast<Expr>(Init); } 814 815 bool isFileScope() const { return FileScope; } 816 817 SourceLocation getLParenLoc() const { return LParenLoc; } 818 819 virtual SourceRange getSourceRange() const { 820 // FIXME: Init should never be null. 821 if (!Init) 822 return SourceRange(); 823 if (LParenLoc.isInvalid()) 824 return Init->getSourceRange(); 825 return SourceRange(LParenLoc, Init->getLocEnd()); 826 } 827 828 static bool classof(const Stmt *T) { 829 return T->getStmtClass() == CompoundLiteralExprClass; 830 } 831 static bool classof(const CompoundLiteralExpr *) { return true; } 832 833 // Iterators 834 virtual child_iterator child_begin(); 835 virtual child_iterator child_end(); 836 837 virtual void EmitImpl(llvm::Serializer& S) const; 838 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 839}; 840 841/// ImplicitCastExpr - Allows us to explicitly represent implicit type 842/// conversions. For example: converting T[]->T*, void f()->void (*f)(), 843/// float->double, short->int, etc. 844/// 845class ImplicitCastExpr : public Expr { 846 Stmt *Op; 847public: 848 ImplicitCastExpr(QualType ty, Expr *op) : 849 Expr(ImplicitCastExprClass, ty), Op(op) {} 850 851 Expr *getSubExpr() { return cast<Expr>(Op); } 852 const Expr *getSubExpr() const { return cast<Expr>(Op); } 853 854 virtual SourceRange getSourceRange() const { return Op->getSourceRange(); } 855 856 static bool classof(const Stmt *T) { 857 return T->getStmtClass() == ImplicitCastExprClass; 858 } 859 static bool classof(const ImplicitCastExpr *) { return true; } 860 861 // Iterators 862 virtual child_iterator child_begin(); 863 virtual child_iterator child_end(); 864 865 virtual void EmitImpl(llvm::Serializer& S) const; 866 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 867}; 868 869/// CastExpr - [C99 6.5.4] Cast Operators. 870/// 871class CastExpr : public Expr { 872 Stmt *Op; 873 SourceLocation Loc; // the location of the left paren 874public: 875 CastExpr(QualType ty, Expr *op, SourceLocation l) : 876 Expr(CastExprClass, ty), Op(op), Loc(l) {} 877 878 SourceLocation getLParenLoc() const { return Loc; } 879 880 Expr *getSubExpr() const { return cast<Expr>(Op); } 881 882 virtual SourceRange getSourceRange() const { 883 return SourceRange(Loc, getSubExpr()->getSourceRange().getEnd()); 884 } 885 static bool classof(const Stmt *T) { 886 return T->getStmtClass() == CastExprClass; 887 } 888 static bool classof(const CastExpr *) { return true; } 889 890 // Iterators 891 virtual child_iterator child_begin(); 892 virtual child_iterator child_end(); 893 894 virtual void EmitImpl(llvm::Serializer& S) const; 895 static CastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 896}; 897 898class BinaryOperator : public Expr { 899public: 900 enum Opcode { 901 // Operators listed in order of precedence. 902 // Note that additions to this should also update the StmtVisitor class. 903 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 904 Add, Sub, // [C99 6.5.6] Additive operators. 905 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 906 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 907 EQ, NE, // [C99 6.5.9] Equality operators. 908 And, // [C99 6.5.10] Bitwise AND operator. 909 Xor, // [C99 6.5.11] Bitwise XOR operator. 910 Or, // [C99 6.5.12] Bitwise OR operator. 911 LAnd, // [C99 6.5.13] Logical AND operator. 912 LOr, // [C99 6.5.14] Logical OR operator. 913 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 914 DivAssign, RemAssign, 915 AddAssign, SubAssign, 916 ShlAssign, ShrAssign, 917 AndAssign, XorAssign, 918 OrAssign, 919 Comma // [C99 6.5.17] Comma operator. 920 }; 921private: 922 enum { LHS, RHS, END_EXPR }; 923 Stmt* SubExprs[END_EXPR]; 924 Opcode Opc; 925 SourceLocation OpLoc; 926public: 927 928 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 929 SourceLocation opLoc) 930 : Expr(BinaryOperatorClass, ResTy), Opc(opc), OpLoc(opLoc) { 931 SubExprs[LHS] = lhs; 932 SubExprs[RHS] = rhs; 933 assert(!isCompoundAssignmentOp() && 934 "Use ArithAssignBinaryOperator for compound assignments"); 935 } 936 937 SourceLocation getOperatorLoc() const { return OpLoc; } 938 Opcode getOpcode() const { return Opc; } 939 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 940 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 941 virtual SourceRange getSourceRange() const { 942 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 943 } 944 945 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 946 /// corresponds to, e.g. "<<=". 947 static const char *getOpcodeStr(Opcode Op); 948 949 /// predicates to categorize the respective opcodes. 950 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 951 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 952 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 953 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 954 955 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 956 bool isRelationalOp() const { return isRelationalOp(Opc); } 957 958 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 959 bool isEqualityOp() const { return isEqualityOp(Opc); } 960 961 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 962 bool isLogicalOp() const { return isLogicalOp(Opc); } 963 964 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 965 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 966 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 967 968 static bool classof(const Stmt *S) { 969 return S->getStmtClass() == BinaryOperatorClass || 970 S->getStmtClass() == CompoundAssignOperatorClass; 971 } 972 static bool classof(const BinaryOperator *) { return true; } 973 974 // Iterators 975 virtual child_iterator child_begin(); 976 virtual child_iterator child_end(); 977 978 virtual void EmitImpl(llvm::Serializer& S) const; 979 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 980 981protected: 982 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 983 SourceLocation oploc, bool dead) 984 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 985 SubExprs[LHS] = lhs; 986 SubExprs[RHS] = rhs; 987 } 988}; 989 990/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 991/// track of the type the operation is performed in. Due to the semantics of 992/// these operators, the operands are promoted, the aritmetic performed, an 993/// implicit conversion back to the result type done, then the assignment takes 994/// place. This captures the intermediate type which the computation is done 995/// in. 996class CompoundAssignOperator : public BinaryOperator { 997 QualType ComputationType; 998public: 999 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1000 QualType ResType, QualType CompType, 1001 SourceLocation OpLoc) 1002 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1003 ComputationType(CompType) { 1004 assert(isCompoundAssignmentOp() && 1005 "Only should be used for compound assignments"); 1006 } 1007 1008 QualType getComputationType() const { return ComputationType; } 1009 1010 static bool classof(const CompoundAssignOperator *) { return true; } 1011 static bool classof(const Stmt *S) { 1012 return S->getStmtClass() == CompoundAssignOperatorClass; 1013 } 1014 1015 virtual void EmitImpl(llvm::Serializer& S) const; 1016 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1017 ASTContext& C); 1018}; 1019 1020/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1021/// GNU "missing LHS" extension is in use. 1022/// 1023class ConditionalOperator : public Expr { 1024 enum { COND, LHS, RHS, END_EXPR }; 1025 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1026public: 1027 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1028 : Expr(ConditionalOperatorClass, t) { 1029 SubExprs[COND] = cond; 1030 SubExprs[LHS] = lhs; 1031 SubExprs[RHS] = rhs; 1032 } 1033 1034 // getCond - Return the expression representing the condition for 1035 // the ?: operator. 1036 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1037 1038 // getTrueExpr - Return the subexpression representing the value of the ?: 1039 // expression if the condition evaluates to true. In most cases this value 1040 // will be the same as getLHS() except a GCC extension allows the left 1041 // subexpression to be omitted, and instead of the condition be returned. 1042 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1043 // is only evaluated once. 1044 Expr *getTrueExpr() const { 1045 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1046 } 1047 1048 // getTrueExpr - Return the subexpression representing the value of the ?: 1049 // expression if the condition evaluates to false. This is the same as getRHS. 1050 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1051 1052 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1053 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1054 1055 virtual SourceRange getSourceRange() const { 1056 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1057 } 1058 static bool classof(const Stmt *T) { 1059 return T->getStmtClass() == ConditionalOperatorClass; 1060 } 1061 static bool classof(const ConditionalOperator *) { return true; } 1062 1063 // Iterators 1064 virtual child_iterator child_begin(); 1065 virtual child_iterator child_end(); 1066 1067 virtual void EmitImpl(llvm::Serializer& S) const; 1068 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1069}; 1070 1071/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1072class AddrLabelExpr : public Expr { 1073 SourceLocation AmpAmpLoc, LabelLoc; 1074 LabelStmt *Label; 1075public: 1076 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1077 QualType t) 1078 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1079 1080 virtual SourceRange getSourceRange() const { 1081 return SourceRange(AmpAmpLoc, LabelLoc); 1082 } 1083 1084 LabelStmt *getLabel() const { return Label; } 1085 1086 static bool classof(const Stmt *T) { 1087 return T->getStmtClass() == AddrLabelExprClass; 1088 } 1089 static bool classof(const AddrLabelExpr *) { return true; } 1090 1091 // Iterators 1092 virtual child_iterator child_begin(); 1093 virtual child_iterator child_end(); 1094 1095 virtual void EmitImpl(llvm::Serializer& S) const; 1096 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1097}; 1098 1099/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1100/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1101/// takes the value of the last subexpression. 1102class StmtExpr : public Expr { 1103 Stmt *SubStmt; 1104 SourceLocation LParenLoc, RParenLoc; 1105public: 1106 StmtExpr(CompoundStmt *substmt, QualType T, 1107 SourceLocation lp, SourceLocation rp) : 1108 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1109 1110 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1111 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1112 1113 virtual SourceRange getSourceRange() const { 1114 return SourceRange(LParenLoc, RParenLoc); 1115 } 1116 1117 static bool classof(const Stmt *T) { 1118 return T->getStmtClass() == StmtExprClass; 1119 } 1120 static bool classof(const StmtExpr *) { return true; } 1121 1122 // Iterators 1123 virtual child_iterator child_begin(); 1124 virtual child_iterator child_end(); 1125 1126 virtual void EmitImpl(llvm::Serializer& S) const; 1127 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1128}; 1129 1130/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1131/// This AST node represents a function that returns 1 if two *types* (not 1132/// expressions) are compatible. The result of this built-in function can be 1133/// used in integer constant expressions. 1134class TypesCompatibleExpr : public Expr { 1135 QualType Type1; 1136 QualType Type2; 1137 SourceLocation BuiltinLoc, RParenLoc; 1138public: 1139 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1140 QualType t1, QualType t2, SourceLocation RP) : 1141 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1142 BuiltinLoc(BLoc), RParenLoc(RP) {} 1143 1144 QualType getArgType1() const { return Type1; } 1145 QualType getArgType2() const { return Type2; } 1146 1147 virtual SourceRange getSourceRange() const { 1148 return SourceRange(BuiltinLoc, RParenLoc); 1149 } 1150 static bool classof(const Stmt *T) { 1151 return T->getStmtClass() == TypesCompatibleExprClass; 1152 } 1153 static bool classof(const TypesCompatibleExpr *) { return true; } 1154 1155 // Iterators 1156 virtual child_iterator child_begin(); 1157 virtual child_iterator child_end(); 1158}; 1159 1160/// ShuffleVectorExpr - clang-specific builtin-in function 1161/// __builtin_shufflevector. 1162/// This AST node represents a operator that does a constant 1163/// shuffle, similar to LLVM's shufflevector instruction. It takes 1164/// two vectors and a variable number of constant indices, 1165/// and returns the appropriately shuffled vector. 1166class ShuffleVectorExpr : public Expr { 1167 SourceLocation BuiltinLoc, RParenLoc; 1168 1169 // SubExprs - the list of values passed to the __builtin_shufflevector 1170 // function. The first two are vectors, and the rest are constant 1171 // indices. The number of values in this list is always 1172 // 2+the number of indices in the vector type. 1173 Stmt **SubExprs; 1174 unsigned NumExprs; 1175 1176public: 1177 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1178 QualType Type, SourceLocation BLoc, 1179 SourceLocation RP) : 1180 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1181 RParenLoc(RP), NumExprs(nexpr) { 1182 1183 SubExprs = new Stmt*[nexpr]; 1184 for (unsigned i = 0; i < nexpr; i++) 1185 SubExprs[i] = args[i]; 1186 } 1187 1188 virtual SourceRange getSourceRange() const { 1189 return SourceRange(BuiltinLoc, RParenLoc); 1190 } 1191 static bool classof(const Stmt *T) { 1192 return T->getStmtClass() == ShuffleVectorExprClass; 1193 } 1194 static bool classof(const ShuffleVectorExpr *) { return true; } 1195 1196 ~ShuffleVectorExpr() { 1197 delete [] SubExprs; 1198 } 1199 1200 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1201 /// constant expression, the actual arguments passed in, and the function 1202 /// pointers. 1203 unsigned getNumSubExprs() const { return NumExprs; } 1204 1205 /// getExpr - Return the Expr at the specified index. 1206 Expr *getExpr(unsigned Index) { 1207 assert((Index < NumExprs) && "Arg access out of range!"); 1208 return cast<Expr>(SubExprs[Index]); 1209 } 1210 const Expr *getExpr(unsigned Index) const { 1211 assert((Index < NumExprs) && "Arg access out of range!"); 1212 return cast<Expr>(SubExprs[Index]); 1213 } 1214 1215 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1216 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1217 llvm::APSInt Result(32); 1218 bool result = getExpr(N+2)->isIntegerConstantExpr(Result, Ctx); 1219 assert(result && "Must be integer constant"); 1220 return Result.getZExtValue(); 1221 } 1222 1223 // Iterators 1224 virtual child_iterator child_begin(); 1225 virtual child_iterator child_end(); 1226}; 1227 1228/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1229/// This AST node is similar to the conditional operator (?:) in C, with 1230/// the following exceptions: 1231/// - the test expression much be a constant expression. 1232/// - the expression returned has it's type unaltered by promotion rules. 1233/// - does not evaluate the expression that was not chosen. 1234class ChooseExpr : public Expr { 1235 enum { COND, LHS, RHS, END_EXPR }; 1236 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1237 SourceLocation BuiltinLoc, RParenLoc; 1238public: 1239 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1240 SourceLocation RP) 1241 : Expr(ChooseExprClass, t), 1242 BuiltinLoc(BLoc), RParenLoc(RP) { 1243 SubExprs[COND] = cond; 1244 SubExprs[LHS] = lhs; 1245 SubExprs[RHS] = rhs; 1246 } 1247 1248 /// isConditionTrue - Return true if the condition is true. This is always 1249 /// statically knowable for a well-formed choosexpr. 1250 bool isConditionTrue(ASTContext &C) const; 1251 1252 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1253 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1254 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1255 1256 virtual SourceRange getSourceRange() const { 1257 return SourceRange(BuiltinLoc, RParenLoc); 1258 } 1259 static bool classof(const Stmt *T) { 1260 return T->getStmtClass() == ChooseExprClass; 1261 } 1262 static bool classof(const ChooseExpr *) { return true; } 1263 1264 // Iterators 1265 virtual child_iterator child_begin(); 1266 virtual child_iterator child_end(); 1267}; 1268 1269/// OverloadExpr - Clang builtin function __builtin_overload. 1270/// This AST node provides a way to overload functions in C. 1271/// 1272/// The first argument is required to be a constant expression, for the number 1273/// of arguments passed to each candidate function. 1274/// 1275/// The next N arguments, where N is the value of the constant expression, 1276/// are the values to be passed as arguments. 1277/// 1278/// The rest of the arguments are values of pointer to function type, which 1279/// are the candidate functions for overloading. 1280/// 1281/// The result is a equivalent to a CallExpr taking N arguments to the 1282/// candidate function whose parameter types match the types of the N arguments. 1283/// 1284/// example: float Z = __builtin_overload(2, X, Y, modf, mod, modl); 1285/// If X and Y are long doubles, Z will assigned the result of modl(X, Y); 1286/// If X and Y are floats, Z will be assigned the result of modf(X, Y); 1287class OverloadExpr : public Expr { 1288 // SubExprs - the list of values passed to the __builtin_overload function. 1289 // SubExpr[0] is a constant expression 1290 // SubExpr[1-N] are the parameters to pass to the matching function call 1291 // SubExpr[N-...] are the candidate functions, of type pointer to function. 1292 Stmt **SubExprs; 1293 1294 // NumExprs - the size of the SubExprs array 1295 unsigned NumExprs; 1296 1297 // The index of the matching candidate function 1298 unsigned FnIndex; 1299 1300 SourceLocation BuiltinLoc; 1301 SourceLocation RParenLoc; 1302public: 1303 OverloadExpr(Expr **args, unsigned nexprs, unsigned idx, QualType t, 1304 SourceLocation bloc, SourceLocation rploc) 1305 : Expr(OverloadExprClass, t), NumExprs(nexprs), FnIndex(idx), 1306 BuiltinLoc(bloc), RParenLoc(rploc) { 1307 SubExprs = new Stmt*[nexprs]; 1308 for (unsigned i = 0; i != nexprs; ++i) 1309 SubExprs[i] = args[i]; 1310 } 1311 ~OverloadExpr() { 1312 delete [] SubExprs; 1313 } 1314 1315 /// arg_begin - Return a pointer to the list of arguments that will be passed 1316 /// to the matching candidate function, skipping over the initial constant 1317 /// expression. 1318 typedef ConstExprIterator const_arg_iterator; 1319 const_arg_iterator arg_begin() const { return &SubExprs[0]+1; } 1320 const_arg_iterator arg_end(ASTContext& Ctx) const { 1321 return &SubExprs[0]+1+getNumArgs(Ctx); 1322 } 1323 1324 /// getNumArgs - Return the number of arguments to pass to the candidate 1325 /// functions. 1326 unsigned getNumArgs(ASTContext &Ctx) const { 1327 llvm::APSInt constEval(32); 1328 (void) cast<Expr>(SubExprs[0])->isIntegerConstantExpr(constEval, Ctx); 1329 return constEval.getZExtValue(); 1330 } 1331 1332 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1333 /// constant expression, the actual arguments passed in, and the function 1334 /// pointers. 1335 unsigned getNumSubExprs() const { return NumExprs; } 1336 1337 /// getExpr - Return the Expr at the specified index. 1338 Expr *getExpr(unsigned Index) { 1339 assert((Index < NumExprs) && "Arg access out of range!"); 1340 return cast<Expr>(SubExprs[Index]); 1341 } 1342 1343 /// getFn - Return the matching candidate function for this OverloadExpr. 1344 Expr *getFn() const { return cast<Expr>(SubExprs[FnIndex]); } 1345 1346 virtual SourceRange getSourceRange() const { 1347 return SourceRange(BuiltinLoc, RParenLoc); 1348 } 1349 static bool classof(const Stmt *T) { 1350 return T->getStmtClass() == OverloadExprClass; 1351 } 1352 static bool classof(const OverloadExpr *) { return true; } 1353 1354 // Iterators 1355 virtual child_iterator child_begin(); 1356 virtual child_iterator child_end(); 1357}; 1358 1359/// VAArgExpr, used for the builtin function __builtin_va_start. 1360class VAArgExpr : public Expr { 1361 Stmt *Val; 1362 SourceLocation BuiltinLoc, RParenLoc; 1363public: 1364 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1365 : Expr(VAArgExprClass, t), 1366 Val(e), 1367 BuiltinLoc(BLoc), 1368 RParenLoc(RPLoc) { } 1369 1370 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1371 Expr *getSubExpr() { return cast<Expr>(Val); } 1372 virtual SourceRange getSourceRange() const { 1373 return SourceRange(BuiltinLoc, RParenLoc); 1374 } 1375 static bool classof(const Stmt *T) { 1376 return T->getStmtClass() == VAArgExprClass; 1377 } 1378 static bool classof(const VAArgExpr *) { return true; } 1379 1380 // Iterators 1381 virtual child_iterator child_begin(); 1382 virtual child_iterator child_end(); 1383}; 1384 1385/// InitListExpr - used for struct and array initializers, such as: 1386/// struct foo x = { 1, { 2, 3 } }; 1387/// 1388/// Because C is somewhat loose with braces, the AST does not necessarily 1389/// directly model the C source. Instead, the semantic analyzer aims to make 1390/// the InitListExprs match up with the type of the decl being initialized. We 1391/// have the following exceptions: 1392/// 1393/// 1. Elements at the end of the list may be dropped from the initializer. 1394/// These elements are defined to be initialized to zero. For example: 1395/// int x[20] = { 1 }; 1396/// 2. Initializers may have excess initializers which are to be ignored by the 1397/// compiler. For example: 1398/// int x[1] = { 1, 2 }; 1399/// 3. Redundant InitListExprs may be present around scalar elements. These 1400/// always have a single element whose type is the same as the InitListExpr. 1401/// this can only happen for Type::isScalarType() types. 1402/// int x = { 1 }; int y[2] = { {1}, {2} }; 1403/// 1404class InitListExpr : public Expr { 1405 std::vector<Stmt *> InitExprs; 1406 SourceLocation LBraceLoc, RBraceLoc; 1407public: 1408 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1409 SourceLocation rbraceloc); 1410 1411 unsigned getNumInits() const { return InitExprs.size(); } 1412 1413 const Expr* getInit(unsigned Init) const { 1414 assert(Init < getNumInits() && "Initializer access out of range!"); 1415 return cast<Expr>(InitExprs[Init]); 1416 } 1417 1418 Expr* getInit(unsigned Init) { 1419 assert(Init < getNumInits() && "Initializer access out of range!"); 1420 return cast<Expr>(InitExprs[Init]); 1421 } 1422 1423 void setInit(unsigned Init, Expr *expr) { 1424 assert(Init < getNumInits() && "Initializer access out of range!"); 1425 InitExprs[Init] = expr; 1426 } 1427 1428 // Dynamic removal/addition (for constructing implicit InitExpr's). 1429 void removeInit(unsigned Init) { 1430 InitExprs.erase(InitExprs.begin()+Init); 1431 } 1432 void addInit(unsigned Init, Expr *expr) { 1433 InitExprs.insert(InitExprs.begin()+Init, expr); 1434 } 1435 1436 // Explicit InitListExpr's originate from source code (and have valid source 1437 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1438 bool isExplicit() { 1439 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1440 } 1441 1442 virtual SourceRange getSourceRange() const { 1443 return SourceRange(LBraceLoc, RBraceLoc); 1444 } 1445 static bool classof(const Stmt *T) { 1446 return T->getStmtClass() == InitListExprClass; 1447 } 1448 static bool classof(const InitListExpr *) { return true; } 1449 1450 // Iterators 1451 virtual child_iterator child_begin(); 1452 virtual child_iterator child_end(); 1453 1454 virtual void EmitImpl(llvm::Serializer& S) const; 1455 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1456 1457private: 1458 // Used by serializer. 1459 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1460}; 1461 1462} // end namespace clang 1463 1464#endif 1465