Expr.cpp revision e883d27dfdf59eeac18f9276bf2460a549e68d31
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 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 implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// Primary Expressions. 32//===----------------------------------------------------------------------===// 33 34void ExplicitTemplateArgumentList::initializeFrom( 35 const TemplateArgumentListInfo &Info) { 36 LAngleLoc = Info.getLAngleLoc(); 37 RAngleLoc = Info.getRAngleLoc(); 38 NumTemplateArgs = Info.size(); 39 40 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 41 for (unsigned i = 0; i != NumTemplateArgs; ++i) 42 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 43} 44 45void ExplicitTemplateArgumentList::copyInto( 46 TemplateArgumentListInfo &Info) const { 47 Info.setLAngleLoc(LAngleLoc); 48 Info.setRAngleLoc(RAngleLoc); 49 for (unsigned I = 0; I != NumTemplateArgs; ++I) 50 Info.addArgument(getTemplateArgs()[I]); 51} 52 53std::size_t ExplicitTemplateArgumentList::sizeFor( 54 const TemplateArgumentListInfo &Info) { 55 return sizeof(ExplicitTemplateArgumentList) + 56 sizeof(TemplateArgumentLoc) * Info.size(); 57} 58 59void DeclRefExpr::computeDependence() { 60 TypeDependent = false; 61 ValueDependent = false; 62 63 NamedDecl *D = getDecl(); 64 65 // (TD) C++ [temp.dep.expr]p3: 66 // An id-expression is type-dependent if it contains: 67 // 68 // and 69 // 70 // (VD) C++ [temp.dep.constexpr]p2: 71 // An identifier is value-dependent if it is: 72 73 // (TD) - an identifier that was declared with dependent type 74 // (VD) - a name declared with a dependent type, 75 if (getType()->isDependentType()) { 76 TypeDependent = true; 77 ValueDependent = true; 78 } 79 // (TD) - a conversion-function-id that specifies a dependent type 80 else if (D->getDeclName().getNameKind() 81 == DeclarationName::CXXConversionFunctionName && 82 D->getDeclName().getCXXNameType()->isDependentType()) { 83 TypeDependent = true; 84 ValueDependent = true; 85 } 86 // (TD) - a template-id that is dependent, 87 else if (hasExplicitTemplateArgumentList() && 88 TemplateSpecializationType::anyDependentTemplateArguments( 89 getTemplateArgs(), 90 getNumTemplateArgs())) { 91 TypeDependent = true; 92 ValueDependent = true; 93 } 94 // (VD) - the name of a non-type template parameter, 95 else if (isa<NonTypeTemplateParmDecl>(D)) 96 ValueDependent = true; 97 // (VD) - a constant with integral or enumeration type and is 98 // initialized with an expression that is value-dependent. 99 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 100 if (Var->getType()->isIntegralType() && 101 Var->getType().getCVRQualifiers() == Qualifiers::Const && 102 Var->getInit() && 103 Var->getInit()->isValueDependent()) 104 ValueDependent = true; 105 } 106 // (TD) - a nested-name-specifier or a qualified-id that names a 107 // member of an unknown specialization. 108 // (handled by DependentScopeDeclRefExpr) 109} 110 111DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 112 SourceRange QualifierRange, 113 NamedDecl *D, SourceLocation NameLoc, 114 const TemplateArgumentListInfo *TemplateArgs, 115 QualType T) 116 : Expr(DeclRefExprClass, T, false, false), 117 DecoratedD(D, 118 (Qualifier? HasQualifierFlag : 0) | 119 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 120 Loc(NameLoc) { 121 if (Qualifier) { 122 NameQualifier *NQ = getNameQualifier(); 123 NQ->NNS = Qualifier; 124 NQ->Range = QualifierRange; 125 } 126 127 if (TemplateArgs) 128 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 129 130 computeDependence(); 131} 132 133DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 134 NestedNameSpecifier *Qualifier, 135 SourceRange QualifierRange, 136 NamedDecl *D, 137 SourceLocation NameLoc, 138 QualType T, 139 const TemplateArgumentListInfo *TemplateArgs) { 140 std::size_t Size = sizeof(DeclRefExpr); 141 if (Qualifier != 0) 142 Size += sizeof(NameQualifier); 143 144 if (TemplateArgs) 145 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 146 147 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 148 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 149 TemplateArgs, T); 150} 151 152SourceRange DeclRefExpr::getSourceRange() const { 153 // FIXME: Does not handle multi-token names well, e.g., operator[]. 154 SourceRange R(Loc); 155 156 if (hasQualifier()) 157 R.setBegin(getQualifierRange().getBegin()); 158 if (hasExplicitTemplateArgumentList()) 159 R.setEnd(getRAngleLoc()); 160 return R; 161} 162 163// FIXME: Maybe this should use DeclPrinter with a special "print predefined 164// expr" policy instead. 165std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 166 const Decl *CurrentDecl) { 167 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 168 if (IT != PrettyFunction) 169 return FD->getNameAsString(); 170 171 llvm::SmallString<256> Name; 172 llvm::raw_svector_ostream Out(Name); 173 174 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 175 if (MD->isVirtual()) 176 Out << "virtual "; 177 } 178 179 PrintingPolicy Policy(Context.getLangOptions()); 180 Policy.SuppressTagKind = true; 181 182 std::string Proto = FD->getQualifiedNameAsString(Policy); 183 184 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 185 const FunctionProtoType *FT = 0; 186 if (FD->hasWrittenPrototype()) 187 FT = dyn_cast<FunctionProtoType>(AFT); 188 189 Proto += "("; 190 if (FT) { 191 llvm::raw_string_ostream POut(Proto); 192 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 193 if (i) POut << ", "; 194 std::string Param; 195 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 196 POut << Param; 197 } 198 199 if (FT->isVariadic()) { 200 if (FD->getNumParams()) POut << ", "; 201 POut << "..."; 202 } 203 } 204 Proto += ")"; 205 206 AFT->getResultType().getAsStringInternal(Proto, Policy); 207 208 Out << Proto; 209 210 Out.flush(); 211 return Name.str().str(); 212 } 213 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 214 llvm::SmallString<256> Name; 215 llvm::raw_svector_ostream Out(Name); 216 Out << (MD->isInstanceMethod() ? '-' : '+'); 217 Out << '['; 218 Out << MD->getClassInterface()->getNameAsString(); 219 if (const ObjCCategoryImplDecl *CID = 220 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 221 Out << '('; 222 Out << CID->getNameAsString(); 223 Out << ')'; 224 } 225 Out << ' '; 226 Out << MD->getSelector().getAsString(); 227 Out << ']'; 228 229 Out.flush(); 230 return Name.str().str(); 231 } 232 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 233 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 234 return "top level"; 235 } 236 return ""; 237} 238 239/// getValueAsApproximateDouble - This returns the value as an inaccurate 240/// double. Note that this may cause loss of precision, but is useful for 241/// debugging dumps, etc. 242double FloatingLiteral::getValueAsApproximateDouble() const { 243 llvm::APFloat V = getValue(); 244 bool ignored; 245 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 246 &ignored); 247 return V.convertToDouble(); 248} 249 250StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 251 unsigned ByteLength, bool Wide, 252 QualType Ty, 253 const SourceLocation *Loc, 254 unsigned NumStrs) { 255 // Allocate enough space for the StringLiteral plus an array of locations for 256 // any concatenated string tokens. 257 void *Mem = C.Allocate(sizeof(StringLiteral)+ 258 sizeof(SourceLocation)*(NumStrs-1), 259 llvm::alignof<StringLiteral>()); 260 StringLiteral *SL = new (Mem) StringLiteral(Ty); 261 262 // OPTIMIZE: could allocate this appended to the StringLiteral. 263 char *AStrData = new (C, 1) char[ByteLength]; 264 memcpy(AStrData, StrData, ByteLength); 265 SL->StrData = AStrData; 266 SL->ByteLength = ByteLength; 267 SL->IsWide = Wide; 268 SL->TokLocs[0] = Loc[0]; 269 SL->NumConcatenated = NumStrs; 270 271 if (NumStrs != 1) 272 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 273 return SL; 274} 275 276StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 277 void *Mem = C.Allocate(sizeof(StringLiteral)+ 278 sizeof(SourceLocation)*(NumStrs-1), 279 llvm::alignof<StringLiteral>()); 280 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 281 SL->StrData = 0; 282 SL->ByteLength = 0; 283 SL->NumConcatenated = NumStrs; 284 return SL; 285} 286 287void StringLiteral::DoDestroy(ASTContext &C) { 288 C.Deallocate(const_cast<char*>(StrData)); 289 Expr::DoDestroy(C); 290} 291 292void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 293 if (StrData) 294 C.Deallocate(const_cast<char*>(StrData)); 295 296 char *AStrData = new (C, 1) char[Str.size()]; 297 memcpy(AStrData, Str.data(), Str.size()); 298 StrData = AStrData; 299 ByteLength = Str.size(); 300} 301 302/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 303/// corresponds to, e.g. "sizeof" or "[pre]++". 304const char *UnaryOperator::getOpcodeStr(Opcode Op) { 305 switch (Op) { 306 default: assert(0 && "Unknown unary operator"); 307 case PostInc: return "++"; 308 case PostDec: return "--"; 309 case PreInc: return "++"; 310 case PreDec: return "--"; 311 case AddrOf: return "&"; 312 case Deref: return "*"; 313 case Plus: return "+"; 314 case Minus: return "-"; 315 case Not: return "~"; 316 case LNot: return "!"; 317 case Real: return "__real"; 318 case Imag: return "__imag"; 319 case Extension: return "__extension__"; 320 case OffsetOf: return "__builtin_offsetof"; 321 } 322} 323 324UnaryOperator::Opcode 325UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 326 switch (OO) { 327 default: assert(false && "No unary operator for overloaded function"); 328 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 329 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 330 case OO_Amp: return AddrOf; 331 case OO_Star: return Deref; 332 case OO_Plus: return Plus; 333 case OO_Minus: return Minus; 334 case OO_Tilde: return Not; 335 case OO_Exclaim: return LNot; 336 } 337} 338 339OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 340 switch (Opc) { 341 case PostInc: case PreInc: return OO_PlusPlus; 342 case PostDec: case PreDec: return OO_MinusMinus; 343 case AddrOf: return OO_Amp; 344 case Deref: return OO_Star; 345 case Plus: return OO_Plus; 346 case Minus: return OO_Minus; 347 case Not: return OO_Tilde; 348 case LNot: return OO_Exclaim; 349 default: return OO_None; 350 } 351} 352 353 354//===----------------------------------------------------------------------===// 355// Postfix Operators. 356//===----------------------------------------------------------------------===// 357 358CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 359 unsigned numargs, QualType t, SourceLocation rparenloc) 360 : Expr(SC, t, 361 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 362 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 363 NumArgs(numargs) { 364 365 SubExprs = new (C) Stmt*[numargs+1]; 366 SubExprs[FN] = fn; 367 for (unsigned i = 0; i != numargs; ++i) 368 SubExprs[i+ARGS_START] = args[i]; 369 370 RParenLoc = rparenloc; 371} 372 373CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 374 QualType t, SourceLocation rparenloc) 375 : Expr(CallExprClass, t, 376 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 377 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 378 NumArgs(numargs) { 379 380 SubExprs = new (C) Stmt*[numargs+1]; 381 SubExprs[FN] = fn; 382 for (unsigned i = 0; i != numargs; ++i) 383 SubExprs[i+ARGS_START] = args[i]; 384 385 RParenLoc = rparenloc; 386} 387 388CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 389 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 390 SubExprs = new (C) Stmt*[1]; 391} 392 393void CallExpr::DoDestroy(ASTContext& C) { 394 DestroyChildren(C); 395 if (SubExprs) C.Deallocate(SubExprs); 396 this->~CallExpr(); 397 C.Deallocate(this); 398} 399 400FunctionDecl *CallExpr::getDirectCallee() { 401 Expr *CEE = getCallee()->IgnoreParenCasts(); 402 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 403 return dyn_cast<FunctionDecl>(DRE->getDecl()); 404 405 return 0; 406} 407 408/// setNumArgs - This changes the number of arguments present in this call. 409/// Any orphaned expressions are deleted by this, and any new operands are set 410/// to null. 411void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 412 // No change, just return. 413 if (NumArgs == getNumArgs()) return; 414 415 // If shrinking # arguments, just delete the extras and forgot them. 416 if (NumArgs < getNumArgs()) { 417 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 418 getArg(i)->Destroy(C); 419 this->NumArgs = NumArgs; 420 return; 421 } 422 423 // Otherwise, we are growing the # arguments. New an bigger argument array. 424 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 425 // Copy over args. 426 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 427 NewSubExprs[i] = SubExprs[i]; 428 // Null out new args. 429 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 430 NewSubExprs[i] = 0; 431 432 if (SubExprs) C.Deallocate(SubExprs); 433 SubExprs = NewSubExprs; 434 this->NumArgs = NumArgs; 435} 436 437/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 438/// not, return 0. 439unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 440 // All simple function calls (e.g. func()) are implicitly cast to pointer to 441 // function. As a result, we try and obtain the DeclRefExpr from the 442 // ImplicitCastExpr. 443 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 444 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 445 return 0; 446 447 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 448 if (!DRE) 449 return 0; 450 451 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 452 if (!FDecl) 453 return 0; 454 455 if (!FDecl->getIdentifier()) 456 return 0; 457 458 return FDecl->getBuiltinID(); 459} 460 461QualType CallExpr::getCallReturnType() const { 462 QualType CalleeType = getCallee()->getType(); 463 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 464 CalleeType = FnTypePtr->getPointeeType(); 465 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 466 CalleeType = BPT->getPointeeType(); 467 468 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 469 return FnType->getResultType(); 470} 471 472MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 473 SourceRange qualrange, NamedDecl *memberdecl, 474 SourceLocation l, const TemplateArgumentListInfo *targs, 475 QualType ty) 476 : Expr(MemberExprClass, ty, 477 base->isTypeDependent() || (qual && qual->isDependent()), 478 base->isValueDependent() || (qual && qual->isDependent())), 479 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 480 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 481 // Initialize the qualifier, if any. 482 if (HasQualifier) { 483 NameQualifier *NQ = getMemberQualifier(); 484 NQ->NNS = qual; 485 NQ->Range = qualrange; 486 } 487 488 // Initialize the explicit template argument list, if any. 489 if (targs) 490 getExplicitTemplateArgumentList()->initializeFrom(*targs); 491} 492 493MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 494 NestedNameSpecifier *qual, 495 SourceRange qualrange, 496 NamedDecl *memberdecl, 497 SourceLocation l, 498 const TemplateArgumentListInfo *targs, 499 QualType ty) { 500 std::size_t Size = sizeof(MemberExpr); 501 if (qual != 0) 502 Size += sizeof(NameQualifier); 503 504 if (targs) 505 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 506 507 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 508 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 509 targs, ty); 510} 511 512const char *CastExpr::getCastKindName() const { 513 switch (getCastKind()) { 514 case CastExpr::CK_Unknown: 515 return "Unknown"; 516 case CastExpr::CK_BitCast: 517 return "BitCast"; 518 case CastExpr::CK_NoOp: 519 return "NoOp"; 520 case CastExpr::CK_BaseToDerived: 521 return "BaseToDerived"; 522 case CastExpr::CK_DerivedToBase: 523 return "DerivedToBase"; 524 case CastExpr::CK_Dynamic: 525 return "Dynamic"; 526 case CastExpr::CK_ToUnion: 527 return "ToUnion"; 528 case CastExpr::CK_ArrayToPointerDecay: 529 return "ArrayToPointerDecay"; 530 case CastExpr::CK_FunctionToPointerDecay: 531 return "FunctionToPointerDecay"; 532 case CastExpr::CK_NullToMemberPointer: 533 return "NullToMemberPointer"; 534 case CastExpr::CK_BaseToDerivedMemberPointer: 535 return "BaseToDerivedMemberPointer"; 536 case CastExpr::CK_DerivedToBaseMemberPointer: 537 return "DerivedToBaseMemberPointer"; 538 case CastExpr::CK_UserDefinedConversion: 539 return "UserDefinedConversion"; 540 case CastExpr::CK_ConstructorConversion: 541 return "ConstructorConversion"; 542 case CastExpr::CK_IntegralToPointer: 543 return "IntegralToPointer"; 544 case CastExpr::CK_PointerToIntegral: 545 return "PointerToIntegral"; 546 case CastExpr::CK_ToVoid: 547 return "ToVoid"; 548 case CastExpr::CK_VectorSplat: 549 return "VectorSplat"; 550 case CastExpr::CK_IntegralCast: 551 return "IntegralCast"; 552 case CastExpr::CK_IntegralToFloating: 553 return "IntegralToFloating"; 554 case CastExpr::CK_FloatingToIntegral: 555 return "FloatingToIntegral"; 556 case CastExpr::CK_FloatingCast: 557 return "FloatingCast"; 558 case CastExpr::CK_MemberPointerToBoolean: 559 return "MemberPointerToBoolean"; 560 } 561 562 assert(0 && "Unhandled cast kind!"); 563 return 0; 564} 565 566/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 567/// corresponds to, e.g. "<<=". 568const char *BinaryOperator::getOpcodeStr(Opcode Op) { 569 switch (Op) { 570 case PtrMemD: return ".*"; 571 case PtrMemI: return "->*"; 572 case Mul: return "*"; 573 case Div: return "/"; 574 case Rem: return "%"; 575 case Add: return "+"; 576 case Sub: return "-"; 577 case Shl: return "<<"; 578 case Shr: return ">>"; 579 case LT: return "<"; 580 case GT: return ">"; 581 case LE: return "<="; 582 case GE: return ">="; 583 case EQ: return "=="; 584 case NE: return "!="; 585 case And: return "&"; 586 case Xor: return "^"; 587 case Or: return "|"; 588 case LAnd: return "&&"; 589 case LOr: return "||"; 590 case Assign: return "="; 591 case MulAssign: return "*="; 592 case DivAssign: return "/="; 593 case RemAssign: return "%="; 594 case AddAssign: return "+="; 595 case SubAssign: return "-="; 596 case ShlAssign: return "<<="; 597 case ShrAssign: return ">>="; 598 case AndAssign: return "&="; 599 case XorAssign: return "^="; 600 case OrAssign: return "|="; 601 case Comma: return ","; 602 } 603 604 return ""; 605} 606 607BinaryOperator::Opcode 608BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 609 switch (OO) { 610 default: assert(false && "Not an overloadable binary operator"); 611 case OO_Plus: return Add; 612 case OO_Minus: return Sub; 613 case OO_Star: return Mul; 614 case OO_Slash: return Div; 615 case OO_Percent: return Rem; 616 case OO_Caret: return Xor; 617 case OO_Amp: return And; 618 case OO_Pipe: return Or; 619 case OO_Equal: return Assign; 620 case OO_Less: return LT; 621 case OO_Greater: return GT; 622 case OO_PlusEqual: return AddAssign; 623 case OO_MinusEqual: return SubAssign; 624 case OO_StarEqual: return MulAssign; 625 case OO_SlashEqual: return DivAssign; 626 case OO_PercentEqual: return RemAssign; 627 case OO_CaretEqual: return XorAssign; 628 case OO_AmpEqual: return AndAssign; 629 case OO_PipeEqual: return OrAssign; 630 case OO_LessLess: return Shl; 631 case OO_GreaterGreater: return Shr; 632 case OO_LessLessEqual: return ShlAssign; 633 case OO_GreaterGreaterEqual: return ShrAssign; 634 case OO_EqualEqual: return EQ; 635 case OO_ExclaimEqual: return NE; 636 case OO_LessEqual: return LE; 637 case OO_GreaterEqual: return GE; 638 case OO_AmpAmp: return LAnd; 639 case OO_PipePipe: return LOr; 640 case OO_Comma: return Comma; 641 case OO_ArrowStar: return PtrMemI; 642 } 643} 644 645OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 646 static const OverloadedOperatorKind OverOps[] = { 647 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 648 OO_Star, OO_Slash, OO_Percent, 649 OO_Plus, OO_Minus, 650 OO_LessLess, OO_GreaterGreater, 651 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 652 OO_EqualEqual, OO_ExclaimEqual, 653 OO_Amp, 654 OO_Caret, 655 OO_Pipe, 656 OO_AmpAmp, 657 OO_PipePipe, 658 OO_Equal, OO_StarEqual, 659 OO_SlashEqual, OO_PercentEqual, 660 OO_PlusEqual, OO_MinusEqual, 661 OO_LessLessEqual, OO_GreaterGreaterEqual, 662 OO_AmpEqual, OO_CaretEqual, 663 OO_PipeEqual, 664 OO_Comma 665 }; 666 return OverOps[Opc]; 667} 668 669InitListExpr::InitListExpr(SourceLocation lbraceloc, 670 Expr **initExprs, unsigned numInits, 671 SourceLocation rbraceloc) 672 : Expr(InitListExprClass, QualType(), false, false), 673 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 674 UnionFieldInit(0), HadArrayRangeDesignator(false) 675{ 676 for (unsigned I = 0; I != numInits; ++I) { 677 if (initExprs[I]->isTypeDependent()) 678 TypeDependent = true; 679 if (initExprs[I]->isValueDependent()) 680 ValueDependent = true; 681 } 682 683 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 684} 685 686void InitListExpr::reserveInits(unsigned NumInits) { 687 if (NumInits > InitExprs.size()) 688 InitExprs.reserve(NumInits); 689} 690 691void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 692 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 693 Idx < LastIdx; ++Idx) 694 InitExprs[Idx]->Destroy(Context); 695 InitExprs.resize(NumInits, 0); 696} 697 698Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 699 if (Init >= InitExprs.size()) { 700 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 701 InitExprs.back() = expr; 702 return 0; 703 } 704 705 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 706 InitExprs[Init] = expr; 707 return Result; 708} 709 710/// getFunctionType - Return the underlying function type for this block. 711/// 712const FunctionType *BlockExpr::getFunctionType() const { 713 return getType()->getAs<BlockPointerType>()-> 714 getPointeeType()->getAs<FunctionType>(); 715} 716 717SourceLocation BlockExpr::getCaretLocation() const { 718 return TheBlock->getCaretLocation(); 719} 720const Stmt *BlockExpr::getBody() const { 721 return TheBlock->getBody(); 722} 723Stmt *BlockExpr::getBody() { 724 return TheBlock->getBody(); 725} 726 727 728//===----------------------------------------------------------------------===// 729// Generic Expression Routines 730//===----------------------------------------------------------------------===// 731 732/// isUnusedResultAWarning - Return true if this immediate expression should 733/// be warned about if the result is unused. If so, fill in Loc and Ranges 734/// with location to warn on and the source range[s] to report with the 735/// warning. 736bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 737 SourceRange &R2, ASTContext &Ctx) const { 738 // Don't warn if the expr is type dependent. The type could end up 739 // instantiating to void. 740 if (isTypeDependent()) 741 return false; 742 743 switch (getStmtClass()) { 744 default: 745 Loc = getExprLoc(); 746 R1 = getSourceRange(); 747 return true; 748 case ParenExprClass: 749 return cast<ParenExpr>(this)->getSubExpr()-> 750 isUnusedResultAWarning(Loc, R1, R2, Ctx); 751 case UnaryOperatorClass: { 752 const UnaryOperator *UO = cast<UnaryOperator>(this); 753 754 switch (UO->getOpcode()) { 755 default: break; 756 case UnaryOperator::PostInc: 757 case UnaryOperator::PostDec: 758 case UnaryOperator::PreInc: 759 case UnaryOperator::PreDec: // ++/-- 760 return false; // Not a warning. 761 case UnaryOperator::Deref: 762 // Dereferencing a volatile pointer is a side-effect. 763 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 764 return false; 765 break; 766 case UnaryOperator::Real: 767 case UnaryOperator::Imag: 768 // accessing a piece of a volatile complex is a side-effect. 769 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 770 .isVolatileQualified()) 771 return false; 772 break; 773 case UnaryOperator::Extension: 774 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 775 } 776 Loc = UO->getOperatorLoc(); 777 R1 = UO->getSubExpr()->getSourceRange(); 778 return true; 779 } 780 case BinaryOperatorClass: { 781 const BinaryOperator *BO = cast<BinaryOperator>(this); 782 // Consider comma to have side effects if the LHS or RHS does. 783 if (BO->getOpcode() == BinaryOperator::Comma) 784 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 785 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 786 787 if (BO->isAssignmentOp()) 788 return false; 789 Loc = BO->getOperatorLoc(); 790 R1 = BO->getLHS()->getSourceRange(); 791 R2 = BO->getRHS()->getSourceRange(); 792 return true; 793 } 794 case CompoundAssignOperatorClass: 795 return false; 796 797 case ConditionalOperatorClass: { 798 // The condition must be evaluated, but if either the LHS or RHS is a 799 // warning, warn about them. 800 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 801 if (Exp->getLHS() && 802 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 803 return true; 804 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 805 } 806 807 case MemberExprClass: 808 // If the base pointer or element is to a volatile pointer/field, accessing 809 // it is a side effect. 810 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 811 return false; 812 Loc = cast<MemberExpr>(this)->getMemberLoc(); 813 R1 = SourceRange(Loc, Loc); 814 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 815 return true; 816 817 case ArraySubscriptExprClass: 818 // If the base pointer or element is to a volatile pointer/field, accessing 819 // it is a side effect. 820 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 821 return false; 822 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 823 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 824 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 825 return true; 826 827 case CallExprClass: 828 case CXXOperatorCallExprClass: 829 case CXXMemberCallExprClass: { 830 // If this is a direct call, get the callee. 831 const CallExpr *CE = cast<CallExpr>(this); 832 if (const FunctionDecl *FD = CE->getDirectCallee()) { 833 // If the callee has attribute pure, const, or warn_unused_result, warn 834 // about it. void foo() { strlen("bar"); } should warn. 835 // 836 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 837 // updated to match for QoI. 838 if (FD->getAttr<WarnUnusedResultAttr>() || 839 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 840 Loc = CE->getCallee()->getLocStart(); 841 R1 = CE->getCallee()->getSourceRange(); 842 843 if (unsigned NumArgs = CE->getNumArgs()) 844 R2 = SourceRange(CE->getArg(0)->getLocStart(), 845 CE->getArg(NumArgs-1)->getLocEnd()); 846 return true; 847 } 848 } 849 return false; 850 } 851 852 case CXXTemporaryObjectExprClass: 853 case CXXConstructExprClass: 854 return false; 855 856 case ObjCMessageExprClass: 857 return false; 858 859 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 860#if 0 861 const ObjCImplicitSetterGetterRefExpr *Ref = 862 cast<ObjCImplicitSetterGetterRefExpr>(this); 863 // FIXME: We really want the location of the '.' here. 864 Loc = Ref->getLocation(); 865 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 866 if (Ref->getBase()) 867 R2 = Ref->getBase()->getSourceRange(); 868#else 869 Loc = getExprLoc(); 870 R1 = getSourceRange(); 871#endif 872 return true; 873 } 874 case StmtExprClass: { 875 // Statement exprs don't logically have side effects themselves, but are 876 // sometimes used in macros in ways that give them a type that is unused. 877 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 878 // however, if the result of the stmt expr is dead, we don't want to emit a 879 // warning. 880 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 881 if (!CS->body_empty()) 882 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 883 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 884 885 Loc = cast<StmtExpr>(this)->getLParenLoc(); 886 R1 = getSourceRange(); 887 return true; 888 } 889 case CStyleCastExprClass: 890 // If this is an explicit cast to void, allow it. People do this when they 891 // think they know what they're doing :). 892 if (getType()->isVoidType()) 893 return false; 894 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 895 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 896 return true; 897 case CXXFunctionalCastExprClass: { 898 const CastExpr *CE = cast<CastExpr>(this); 899 900 // If this is a cast to void or a constructor conversion, check the operand. 901 // Otherwise, the result of the cast is unused. 902 if (CE->getCastKind() == CastExpr::CK_ToVoid || 903 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 904 return (cast<CastExpr>(this)->getSubExpr() 905 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 906 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 907 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 908 return true; 909 } 910 911 case ImplicitCastExprClass: 912 // Check the operand, since implicit casts are inserted by Sema 913 return (cast<ImplicitCastExpr>(this) 914 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 915 916 case CXXDefaultArgExprClass: 917 return (cast<CXXDefaultArgExpr>(this) 918 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 919 920 case CXXNewExprClass: 921 // FIXME: In theory, there might be new expressions that don't have side 922 // effects (e.g. a placement new with an uninitialized POD). 923 case CXXDeleteExprClass: 924 return false; 925 case CXXBindTemporaryExprClass: 926 return (cast<CXXBindTemporaryExpr>(this) 927 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 928 case CXXExprWithTemporariesClass: 929 return (cast<CXXExprWithTemporaries>(this) 930 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 931 } 932} 933 934/// DeclCanBeLvalue - Determine whether the given declaration can be 935/// an lvalue. This is a helper routine for isLvalue. 936static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 937 // C++ [temp.param]p6: 938 // A non-type non-reference template-parameter is not an lvalue. 939 if (const NonTypeTemplateParmDecl *NTTParm 940 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 941 return NTTParm->getType()->isReferenceType(); 942 943 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 944 // C++ 3.10p2: An lvalue refers to an object or function. 945 (Ctx.getLangOptions().CPlusPlus && 946 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 947} 948 949/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 950/// incomplete type other than void. Nonarray expressions that can be lvalues: 951/// - name, where name must be a variable 952/// - e[i] 953/// - (e), where e must be an lvalue 954/// - e.name, where e must be an lvalue 955/// - e->name 956/// - *e, the type of e cannot be a function type 957/// - string-constant 958/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 959/// - reference type [C++ [expr]] 960/// 961Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 962 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 963 964 isLvalueResult Res = isLvalueInternal(Ctx); 965 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 966 return Res; 967 968 // first, check the type (C99 6.3.2.1). Expressions with function 969 // type in C are not lvalues, but they can be lvalues in C++. 970 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 971 return LV_NotObjectType; 972 973 // Allow qualified void which is an incomplete type other than void (yuck). 974 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 975 return LV_IncompleteVoidType; 976 977 return LV_Valid; 978} 979 980// Check whether the expression can be sanely treated like an l-value 981Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 982 switch (getStmtClass()) { 983 case StringLiteralClass: // C99 6.5.1p4 984 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 985 return LV_Valid; 986 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 987 // For vectors, make sure base is an lvalue (i.e. not a function call). 988 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 989 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 990 return LV_Valid; 991 case DeclRefExprClass: { // C99 6.5.1p2 992 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 993 if (DeclCanBeLvalue(RefdDecl, Ctx)) 994 return LV_Valid; 995 break; 996 } 997 case BlockDeclRefExprClass: { 998 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 999 if (isa<VarDecl>(BDR->getDecl())) 1000 return LV_Valid; 1001 break; 1002 } 1003 case MemberExprClass: { 1004 const MemberExpr *m = cast<MemberExpr>(this); 1005 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1006 NamedDecl *Member = m->getMemberDecl(); 1007 // C++ [expr.ref]p4: 1008 // If E2 is declared to have type "reference to T", then E1.E2 1009 // is an lvalue. 1010 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1011 if (Value->getType()->isReferenceType()) 1012 return LV_Valid; 1013 1014 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1015 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1016 return LV_Valid; 1017 1018 // -- If E2 is a non-static data member [...]. If E1 is an 1019 // lvalue, then E1.E2 is an lvalue. 1020 if (isa<FieldDecl>(Member)) 1021 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1022 1023 // -- If it refers to a static member function [...], then 1024 // E1.E2 is an lvalue. 1025 // -- Otherwise, if E1.E2 refers to a non-static member 1026 // function [...], then E1.E2 is not an lvalue. 1027 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1028 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1029 1030 // -- If E2 is a member enumerator [...], the expression E1.E2 1031 // is not an lvalue. 1032 if (isa<EnumConstantDecl>(Member)) 1033 return LV_InvalidExpression; 1034 1035 // Not an lvalue. 1036 return LV_InvalidExpression; 1037 } 1038 1039 // C99 6.5.2.3p4 1040 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1041 } 1042 case UnaryOperatorClass: 1043 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1044 return LV_Valid; // C99 6.5.3p4 1045 1046 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1047 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1048 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1049 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1050 1051 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1052 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1053 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1054 return LV_Valid; 1055 break; 1056 case ImplicitCastExprClass: 1057 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1058 : LV_InvalidExpression; 1059 case ParenExprClass: // C99 6.5.1p5 1060 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1061 case BinaryOperatorClass: 1062 case CompoundAssignOperatorClass: { 1063 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1064 1065 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1066 BinOp->getOpcode() == BinaryOperator::Comma) 1067 return BinOp->getRHS()->isLvalue(Ctx); 1068 1069 // C++ [expr.mptr.oper]p6 1070 // The result of a .* expression is an lvalue only if its first operand is 1071 // an lvalue and its second operand is a pointer to data member. 1072 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1073 !BinOp->getType()->isFunctionType()) 1074 return BinOp->getLHS()->isLvalue(Ctx); 1075 1076 // The result of an ->* expression is an lvalue only if its second operand 1077 // is a pointer to data member. 1078 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1079 !BinOp->getType()->isFunctionType()) { 1080 QualType Ty = BinOp->getRHS()->getType(); 1081 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1082 return LV_Valid; 1083 } 1084 1085 if (!BinOp->isAssignmentOp()) 1086 return LV_InvalidExpression; 1087 1088 if (Ctx.getLangOptions().CPlusPlus) 1089 // C++ [expr.ass]p1: 1090 // The result of an assignment operation [...] is an lvalue. 1091 return LV_Valid; 1092 1093 1094 // C99 6.5.16: 1095 // An assignment expression [...] is not an lvalue. 1096 return LV_InvalidExpression; 1097 } 1098 case CallExprClass: 1099 case CXXOperatorCallExprClass: 1100 case CXXMemberCallExprClass: { 1101 // C++0x [expr.call]p10 1102 // A function call is an lvalue if and only if the result type 1103 // is an lvalue reference. 1104 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1105 if (ReturnType->isLValueReferenceType()) 1106 return LV_Valid; 1107 1108 break; 1109 } 1110 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1111 return LV_Valid; 1112 case ChooseExprClass: 1113 // __builtin_choose_expr is an lvalue if the selected operand is. 1114 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1115 case ExtVectorElementExprClass: 1116 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1117 return LV_DuplicateVectorComponents; 1118 return LV_Valid; 1119 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1120 return LV_Valid; 1121 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1122 return LV_Valid; 1123 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1124 return LV_Valid; 1125 case PredefinedExprClass: 1126 return LV_Valid; 1127 case UnresolvedLookupExprClass: 1128 return LV_Valid; 1129 case CXXDefaultArgExprClass: 1130 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1131 case CStyleCastExprClass: 1132 case CXXFunctionalCastExprClass: 1133 case CXXStaticCastExprClass: 1134 case CXXDynamicCastExprClass: 1135 case CXXReinterpretCastExprClass: 1136 case CXXConstCastExprClass: 1137 // The result of an explicit cast is an lvalue if the type we are 1138 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1139 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1140 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1141 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1142 isLValueReferenceType()) 1143 return LV_Valid; 1144 break; 1145 case CXXTypeidExprClass: 1146 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1147 return LV_Valid; 1148 case CXXBindTemporaryExprClass: 1149 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1150 isLvalueInternal(Ctx); 1151 case ConditionalOperatorClass: { 1152 // Complicated handling is only for C++. 1153 if (!Ctx.getLangOptions().CPlusPlus) 1154 return LV_InvalidExpression; 1155 1156 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1157 // everywhere there's an object converted to an rvalue. Also, any other 1158 // casts should be wrapped by ImplicitCastExprs. There's just the special 1159 // case involving throws to work out. 1160 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1161 Expr *True = Cond->getTrueExpr(); 1162 Expr *False = Cond->getFalseExpr(); 1163 // C++0x 5.16p2 1164 // If either the second or the third operand has type (cv) void, [...] 1165 // the result [...] is an rvalue. 1166 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1167 return LV_InvalidExpression; 1168 1169 // Both sides must be lvalues for the result to be an lvalue. 1170 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1171 return LV_InvalidExpression; 1172 1173 // That's it. 1174 return LV_Valid; 1175 } 1176 1177 default: 1178 break; 1179 } 1180 return LV_InvalidExpression; 1181} 1182 1183/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1184/// does not have an incomplete type, does not have a const-qualified type, and 1185/// if it is a structure or union, does not have any member (including, 1186/// recursively, any member or element of all contained aggregates or unions) 1187/// with a const-qualified type. 1188Expr::isModifiableLvalueResult 1189Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1190 isLvalueResult lvalResult = isLvalue(Ctx); 1191 1192 switch (lvalResult) { 1193 case LV_Valid: 1194 // C++ 3.10p11: Functions cannot be modified, but pointers to 1195 // functions can be modifiable. 1196 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1197 return MLV_NotObjectType; 1198 break; 1199 1200 case LV_NotObjectType: return MLV_NotObjectType; 1201 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1202 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1203 case LV_InvalidExpression: 1204 // If the top level is a C-style cast, and the subexpression is a valid 1205 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1206 // GCC extension. We don't support it, but we want to produce good 1207 // diagnostics when it happens so that the user knows why. 1208 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1209 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1210 if (Loc) 1211 *Loc = CE->getLParenLoc(); 1212 return MLV_LValueCast; 1213 } 1214 } 1215 return MLV_InvalidExpression; 1216 case LV_MemberFunction: return MLV_MemberFunction; 1217 } 1218 1219 // The following is illegal: 1220 // void takeclosure(void (^C)(void)); 1221 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1222 // 1223 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1224 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1225 return MLV_NotBlockQualified; 1226 } 1227 1228 // Assigning to an 'implicit' property? 1229 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1230 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1231 if (Expr->getSetterMethod() == 0) 1232 return MLV_NoSetterProperty; 1233 } 1234 1235 QualType CT = Ctx.getCanonicalType(getType()); 1236 1237 if (CT.isConstQualified()) 1238 return MLV_ConstQualified; 1239 if (CT->isArrayType()) 1240 return MLV_ArrayType; 1241 if (CT->isIncompleteType()) 1242 return MLV_IncompleteType; 1243 1244 if (const RecordType *r = CT->getAs<RecordType>()) { 1245 if (r->hasConstFields()) 1246 return MLV_ConstQualified; 1247 } 1248 1249 return MLV_Valid; 1250} 1251 1252/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1253/// returns true, if it is; false otherwise. 1254bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1255 switch (getStmtClass()) { 1256 default: 1257 return false; 1258 case ObjCIvarRefExprClass: 1259 return true; 1260 case Expr::UnaryOperatorClass: 1261 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1262 case ParenExprClass: 1263 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1264 case ImplicitCastExprClass: 1265 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1266 case CStyleCastExprClass: 1267 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1268 case DeclRefExprClass: { 1269 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1270 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1271 if (VD->hasGlobalStorage()) 1272 return true; 1273 QualType T = VD->getType(); 1274 // dereferencing to a pointer is always a gc'able candidate, 1275 // unless it is __weak. 1276 return T->isPointerType() && 1277 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1278 } 1279 return false; 1280 } 1281 case MemberExprClass: { 1282 const MemberExpr *M = cast<MemberExpr>(this); 1283 return M->getBase()->isOBJCGCCandidate(Ctx); 1284 } 1285 case ArraySubscriptExprClass: 1286 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1287 } 1288} 1289Expr* Expr::IgnoreParens() { 1290 Expr* E = this; 1291 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1292 E = P->getSubExpr(); 1293 1294 return E; 1295} 1296 1297/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1298/// or CastExprs or ImplicitCastExprs, returning their operand. 1299Expr *Expr::IgnoreParenCasts() { 1300 Expr *E = this; 1301 while (true) { 1302 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1303 E = P->getSubExpr(); 1304 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1305 E = P->getSubExpr(); 1306 else 1307 return E; 1308 } 1309} 1310 1311/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1312/// value (including ptr->int casts of the same size). Strip off any 1313/// ParenExpr or CastExprs, returning their operand. 1314Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1315 Expr *E = this; 1316 while (true) { 1317 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1318 E = P->getSubExpr(); 1319 continue; 1320 } 1321 1322 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1323 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1324 // ptr<->int casts of the same width. We also ignore all identify casts. 1325 Expr *SE = P->getSubExpr(); 1326 1327 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1328 E = SE; 1329 continue; 1330 } 1331 1332 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1333 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1334 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1335 E = SE; 1336 continue; 1337 } 1338 } 1339 1340 return E; 1341 } 1342} 1343 1344 1345/// hasAnyTypeDependentArguments - Determines if any of the expressions 1346/// in Exprs is type-dependent. 1347bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1348 for (unsigned I = 0; I < NumExprs; ++I) 1349 if (Exprs[I]->isTypeDependent()) 1350 return true; 1351 1352 return false; 1353} 1354 1355/// hasAnyValueDependentArguments - Determines if any of the expressions 1356/// in Exprs is value-dependent. 1357bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1358 for (unsigned I = 0; I < NumExprs; ++I) 1359 if (Exprs[I]->isValueDependent()) 1360 return true; 1361 1362 return false; 1363} 1364 1365bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1366 // This function is attempting whether an expression is an initializer 1367 // which can be evaluated at compile-time. isEvaluatable handles most 1368 // of the cases, but it can't deal with some initializer-specific 1369 // expressions, and it can't deal with aggregates; we deal with those here, 1370 // and fall back to isEvaluatable for the other cases. 1371 1372 // FIXME: This function assumes the variable being assigned to 1373 // isn't a reference type! 1374 1375 switch (getStmtClass()) { 1376 default: break; 1377 case StringLiteralClass: 1378 case ObjCStringLiteralClass: 1379 case ObjCEncodeExprClass: 1380 return true; 1381 case CompoundLiteralExprClass: { 1382 // This handles gcc's extension that allows global initializers like 1383 // "struct x {int x;} x = (struct x) {};". 1384 // FIXME: This accepts other cases it shouldn't! 1385 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1386 return Exp->isConstantInitializer(Ctx); 1387 } 1388 case InitListExprClass: { 1389 // FIXME: This doesn't deal with fields with reference types correctly. 1390 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1391 // to bitfields. 1392 const InitListExpr *Exp = cast<InitListExpr>(this); 1393 unsigned numInits = Exp->getNumInits(); 1394 for (unsigned i = 0; i < numInits; i++) { 1395 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1396 return false; 1397 } 1398 return true; 1399 } 1400 case ImplicitValueInitExprClass: 1401 return true; 1402 case ParenExprClass: 1403 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1404 case UnaryOperatorClass: { 1405 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1406 if (Exp->getOpcode() == UnaryOperator::Extension) 1407 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1408 break; 1409 } 1410 case BinaryOperatorClass: { 1411 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1412 // but this handles the common case. 1413 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1414 if (Exp->getOpcode() == BinaryOperator::Sub && 1415 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1416 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1417 return true; 1418 break; 1419 } 1420 case ImplicitCastExprClass: 1421 case CStyleCastExprClass: 1422 // Handle casts with a destination that's a struct or union; this 1423 // deals with both the gcc no-op struct cast extension and the 1424 // cast-to-union extension. 1425 if (getType()->isRecordType()) 1426 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1427 1428 // Integer->integer casts can be handled here, which is important for 1429 // things like (int)(&&x-&&y). Scary but true. 1430 if (getType()->isIntegerType() && 1431 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1432 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1433 1434 break; 1435 } 1436 return isEvaluatable(Ctx); 1437} 1438 1439/// isIntegerConstantExpr - this recursive routine will test if an expression is 1440/// an integer constant expression. 1441 1442/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1443/// comma, etc 1444/// 1445/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1446/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1447/// cast+dereference. 1448 1449// CheckICE - This function does the fundamental ICE checking: the returned 1450// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1451// Note that to reduce code duplication, this helper does no evaluation 1452// itself; the caller checks whether the expression is evaluatable, and 1453// in the rare cases where CheckICE actually cares about the evaluated 1454// value, it calls into Evalute. 1455// 1456// Meanings of Val: 1457// 0: This expression is an ICE if it can be evaluated by Evaluate. 1458// 1: This expression is not an ICE, but if it isn't evaluated, it's 1459// a legal subexpression for an ICE. This return value is used to handle 1460// the comma operator in C99 mode. 1461// 2: This expression is not an ICE, and is not a legal subexpression for one. 1462 1463struct ICEDiag { 1464 unsigned Val; 1465 SourceLocation Loc; 1466 1467 public: 1468 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1469 ICEDiag() : Val(0) {} 1470}; 1471 1472ICEDiag NoDiag() { return ICEDiag(); } 1473 1474static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1475 Expr::EvalResult EVResult; 1476 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1477 !EVResult.Val.isInt()) { 1478 return ICEDiag(2, E->getLocStart()); 1479 } 1480 return NoDiag(); 1481} 1482 1483static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1484 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1485 if (!E->getType()->isIntegralType()) { 1486 return ICEDiag(2, E->getLocStart()); 1487 } 1488 1489 switch (E->getStmtClass()) { 1490#define STMT(Node, Base) case Expr::Node##Class: 1491#define EXPR(Node, Base) 1492#include "clang/AST/StmtNodes.def" 1493 case Expr::PredefinedExprClass: 1494 case Expr::FloatingLiteralClass: 1495 case Expr::ImaginaryLiteralClass: 1496 case Expr::StringLiteralClass: 1497 case Expr::ArraySubscriptExprClass: 1498 case Expr::MemberExprClass: 1499 case Expr::CompoundAssignOperatorClass: 1500 case Expr::CompoundLiteralExprClass: 1501 case Expr::ExtVectorElementExprClass: 1502 case Expr::InitListExprClass: 1503 case Expr::DesignatedInitExprClass: 1504 case Expr::ImplicitValueInitExprClass: 1505 case Expr::ParenListExprClass: 1506 case Expr::VAArgExprClass: 1507 case Expr::AddrLabelExprClass: 1508 case Expr::StmtExprClass: 1509 case Expr::CXXMemberCallExprClass: 1510 case Expr::CXXDynamicCastExprClass: 1511 case Expr::CXXTypeidExprClass: 1512 case Expr::CXXNullPtrLiteralExprClass: 1513 case Expr::CXXThisExprClass: 1514 case Expr::CXXThrowExprClass: 1515 case Expr::CXXNewExprClass: 1516 case Expr::CXXDeleteExprClass: 1517 case Expr::CXXPseudoDestructorExprClass: 1518 case Expr::UnresolvedLookupExprClass: 1519 case Expr::DependentScopeDeclRefExprClass: 1520 case Expr::CXXConstructExprClass: 1521 case Expr::CXXBindTemporaryExprClass: 1522 case Expr::CXXExprWithTemporariesClass: 1523 case Expr::CXXTemporaryObjectExprClass: 1524 case Expr::CXXUnresolvedConstructExprClass: 1525 case Expr::CXXDependentScopeMemberExprClass: 1526 case Expr::UnresolvedMemberExprClass: 1527 case Expr::ObjCStringLiteralClass: 1528 case Expr::ObjCEncodeExprClass: 1529 case Expr::ObjCMessageExprClass: 1530 case Expr::ObjCSelectorExprClass: 1531 case Expr::ObjCProtocolExprClass: 1532 case Expr::ObjCIvarRefExprClass: 1533 case Expr::ObjCPropertyRefExprClass: 1534 case Expr::ObjCImplicitSetterGetterRefExprClass: 1535 case Expr::ObjCSuperExprClass: 1536 case Expr::ObjCIsaExprClass: 1537 case Expr::ShuffleVectorExprClass: 1538 case Expr::BlockExprClass: 1539 case Expr::BlockDeclRefExprClass: 1540 case Expr::NoStmtClass: 1541 case Expr::ExprClass: 1542 return ICEDiag(2, E->getLocStart()); 1543 1544 case Expr::GNUNullExprClass: 1545 // GCC considers the GNU __null value to be an integral constant expression. 1546 return NoDiag(); 1547 1548 case Expr::ParenExprClass: 1549 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1550 case Expr::IntegerLiteralClass: 1551 case Expr::CharacterLiteralClass: 1552 case Expr::CXXBoolLiteralExprClass: 1553 case Expr::CXXZeroInitValueExprClass: 1554 case Expr::TypesCompatibleExprClass: 1555 case Expr::UnaryTypeTraitExprClass: 1556 return NoDiag(); 1557 case Expr::CallExprClass: 1558 case Expr::CXXOperatorCallExprClass: { 1559 const CallExpr *CE = cast<CallExpr>(E); 1560 if (CE->isBuiltinCall(Ctx)) 1561 return CheckEvalInICE(E, Ctx); 1562 return ICEDiag(2, E->getLocStart()); 1563 } 1564 case Expr::DeclRefExprClass: 1565 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1566 return NoDiag(); 1567 if (Ctx.getLangOptions().CPlusPlus && 1568 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1569 // C++ 7.1.5.1p2 1570 // A variable of non-volatile const-qualified integral or enumeration 1571 // type initialized by an ICE can be used in ICEs. 1572 if (const VarDecl *Dcl = 1573 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1574 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1575 if (Quals.hasVolatile() || !Quals.hasConst()) 1576 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1577 1578 // Look for the definition of this variable, which will actually have 1579 // an initializer. 1580 const VarDecl *Def = 0; 1581 const Expr *Init = Dcl->getDefinition(Def); 1582 if (Init) { 1583 if (Def->isInitKnownICE()) { 1584 // We have already checked whether this subexpression is an 1585 // integral constant expression. 1586 if (Def->isInitICE()) 1587 return NoDiag(); 1588 else 1589 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1590 } 1591 1592 // C++ [class.static.data]p4: 1593 // If a static data member is of const integral or const 1594 // enumeration type, its declaration in the class definition can 1595 // specify a constant-initializer which shall be an integral 1596 // constant expression (5.19). In that case, the member can appear 1597 // in integral constant expressions. 1598 if (Def->isOutOfLine()) { 1599 Dcl->setInitKnownICE(false); 1600 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1601 } 1602 1603 if (Dcl->isCheckingICE()) { 1604 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1605 } 1606 1607 Dcl->setCheckingICE(); 1608 ICEDiag Result = CheckICE(Init, Ctx); 1609 // Cache the result of the ICE test. 1610 Dcl->setInitKnownICE(Result.Val == 0); 1611 return Result; 1612 } 1613 } 1614 } 1615 return ICEDiag(2, E->getLocStart()); 1616 case Expr::UnaryOperatorClass: { 1617 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1618 switch (Exp->getOpcode()) { 1619 case UnaryOperator::PostInc: 1620 case UnaryOperator::PostDec: 1621 case UnaryOperator::PreInc: 1622 case UnaryOperator::PreDec: 1623 case UnaryOperator::AddrOf: 1624 case UnaryOperator::Deref: 1625 return ICEDiag(2, E->getLocStart()); 1626 1627 case UnaryOperator::Extension: 1628 case UnaryOperator::LNot: 1629 case UnaryOperator::Plus: 1630 case UnaryOperator::Minus: 1631 case UnaryOperator::Not: 1632 case UnaryOperator::Real: 1633 case UnaryOperator::Imag: 1634 return CheckICE(Exp->getSubExpr(), Ctx); 1635 case UnaryOperator::OffsetOf: 1636 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1637 // Evaluate matches the proposed gcc behavior for cases like 1638 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1639 // compliance: we should warn earlier for offsetof expressions with 1640 // array subscripts that aren't ICEs, and if the array subscripts 1641 // are ICEs, the value of the offsetof must be an integer constant. 1642 return CheckEvalInICE(E, Ctx); 1643 } 1644 } 1645 case Expr::SizeOfAlignOfExprClass: { 1646 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1647 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1648 return ICEDiag(2, E->getLocStart()); 1649 return NoDiag(); 1650 } 1651 case Expr::BinaryOperatorClass: { 1652 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1653 switch (Exp->getOpcode()) { 1654 case BinaryOperator::PtrMemD: 1655 case BinaryOperator::PtrMemI: 1656 case BinaryOperator::Assign: 1657 case BinaryOperator::MulAssign: 1658 case BinaryOperator::DivAssign: 1659 case BinaryOperator::RemAssign: 1660 case BinaryOperator::AddAssign: 1661 case BinaryOperator::SubAssign: 1662 case BinaryOperator::ShlAssign: 1663 case BinaryOperator::ShrAssign: 1664 case BinaryOperator::AndAssign: 1665 case BinaryOperator::XorAssign: 1666 case BinaryOperator::OrAssign: 1667 return ICEDiag(2, E->getLocStart()); 1668 1669 case BinaryOperator::Mul: 1670 case BinaryOperator::Div: 1671 case BinaryOperator::Rem: 1672 case BinaryOperator::Add: 1673 case BinaryOperator::Sub: 1674 case BinaryOperator::Shl: 1675 case BinaryOperator::Shr: 1676 case BinaryOperator::LT: 1677 case BinaryOperator::GT: 1678 case BinaryOperator::LE: 1679 case BinaryOperator::GE: 1680 case BinaryOperator::EQ: 1681 case BinaryOperator::NE: 1682 case BinaryOperator::And: 1683 case BinaryOperator::Xor: 1684 case BinaryOperator::Or: 1685 case BinaryOperator::Comma: { 1686 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1687 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1688 if (Exp->getOpcode() == BinaryOperator::Div || 1689 Exp->getOpcode() == BinaryOperator::Rem) { 1690 // Evaluate gives an error for undefined Div/Rem, so make sure 1691 // we don't evaluate one. 1692 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1693 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1694 if (REval == 0) 1695 return ICEDiag(1, E->getLocStart()); 1696 if (REval.isSigned() && REval.isAllOnesValue()) { 1697 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1698 if (LEval.isMinSignedValue()) 1699 return ICEDiag(1, E->getLocStart()); 1700 } 1701 } 1702 } 1703 if (Exp->getOpcode() == BinaryOperator::Comma) { 1704 if (Ctx.getLangOptions().C99) { 1705 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1706 // if it isn't evaluated. 1707 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1708 return ICEDiag(1, E->getLocStart()); 1709 } else { 1710 // In both C89 and C++, commas in ICEs are illegal. 1711 return ICEDiag(2, E->getLocStart()); 1712 } 1713 } 1714 if (LHSResult.Val >= RHSResult.Val) 1715 return LHSResult; 1716 return RHSResult; 1717 } 1718 case BinaryOperator::LAnd: 1719 case BinaryOperator::LOr: { 1720 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1721 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1722 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1723 // Rare case where the RHS has a comma "side-effect"; we need 1724 // to actually check the condition to see whether the side 1725 // with the comma is evaluated. 1726 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1727 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1728 return RHSResult; 1729 return NoDiag(); 1730 } 1731 1732 if (LHSResult.Val >= RHSResult.Val) 1733 return LHSResult; 1734 return RHSResult; 1735 } 1736 } 1737 } 1738 case Expr::CastExprClass: 1739 case Expr::ImplicitCastExprClass: 1740 case Expr::ExplicitCastExprClass: 1741 case Expr::CStyleCastExprClass: 1742 case Expr::CXXFunctionalCastExprClass: 1743 case Expr::CXXNamedCastExprClass: 1744 case Expr::CXXStaticCastExprClass: 1745 case Expr::CXXReinterpretCastExprClass: 1746 case Expr::CXXConstCastExprClass: { 1747 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1748 if (SubExpr->getType()->isIntegralType()) 1749 return CheckICE(SubExpr, Ctx); 1750 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1751 return NoDiag(); 1752 return ICEDiag(2, E->getLocStart()); 1753 } 1754 case Expr::ConditionalOperatorClass: { 1755 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1756 // If the condition (ignoring parens) is a __builtin_constant_p call, 1757 // then only the true side is actually considered in an integer constant 1758 // expression, and it is fully evaluated. This is an important GNU 1759 // extension. See GCC PR38377 for discussion. 1760 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1761 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1762 Expr::EvalResult EVResult; 1763 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1764 !EVResult.Val.isInt()) { 1765 return ICEDiag(2, E->getLocStart()); 1766 } 1767 return NoDiag(); 1768 } 1769 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1770 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1771 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1772 if (CondResult.Val == 2) 1773 return CondResult; 1774 if (TrueResult.Val == 2) 1775 return TrueResult; 1776 if (FalseResult.Val == 2) 1777 return FalseResult; 1778 if (CondResult.Val == 1) 1779 return CondResult; 1780 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1781 return NoDiag(); 1782 // Rare case where the diagnostics depend on which side is evaluated 1783 // Note that if we get here, CondResult is 0, and at least one of 1784 // TrueResult and FalseResult is non-zero. 1785 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1786 return FalseResult; 1787 } 1788 return TrueResult; 1789 } 1790 case Expr::CXXDefaultArgExprClass: 1791 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1792 case Expr::ChooseExprClass: { 1793 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1794 } 1795 } 1796 1797 // Silence a GCC warning 1798 return ICEDiag(2, E->getLocStart()); 1799} 1800 1801bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1802 SourceLocation *Loc, bool isEvaluated) const { 1803 ICEDiag d = CheckICE(this, Ctx); 1804 if (d.Val != 0) { 1805 if (Loc) *Loc = d.Loc; 1806 return false; 1807 } 1808 EvalResult EvalResult; 1809 if (!Evaluate(EvalResult, Ctx)) 1810 llvm::llvm_unreachable("ICE cannot be evaluated!"); 1811 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1812 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1813 Result = EvalResult.Val.getInt(); 1814 return true; 1815} 1816 1817/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1818/// integer constant expression with the value zero, or if this is one that is 1819/// cast to void*. 1820bool Expr::isNullPointerConstant(ASTContext &Ctx, 1821 NullPointerConstantValueDependence NPC) const { 1822 if (isValueDependent()) { 1823 switch (NPC) { 1824 case NPC_NeverValueDependent: 1825 assert(false && "Unexpected value dependent expression!"); 1826 // If the unthinkable happens, fall through to the safest alternative. 1827 1828 case NPC_ValueDependentIsNull: 1829 return isTypeDependent() || getType()->isIntegralType(); 1830 1831 case NPC_ValueDependentIsNotNull: 1832 return false; 1833 } 1834 } 1835 1836 // Strip off a cast to void*, if it exists. Except in C++. 1837 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1838 if (!Ctx.getLangOptions().CPlusPlus) { 1839 // Check that it is a cast to void*. 1840 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1841 QualType Pointee = PT->getPointeeType(); 1842 if (!Pointee.hasQualifiers() && 1843 Pointee->isVoidType() && // to void* 1844 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1845 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1846 } 1847 } 1848 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1849 // Ignore the ImplicitCastExpr type entirely. 1850 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1851 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1852 // Accept ((void*)0) as a null pointer constant, as many other 1853 // implementations do. 1854 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1855 } else if (const CXXDefaultArgExpr *DefaultArg 1856 = dyn_cast<CXXDefaultArgExpr>(this)) { 1857 // See through default argument expressions 1858 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1859 } else if (isa<GNUNullExpr>(this)) { 1860 // The GNU __null extension is always a null pointer constant. 1861 return true; 1862 } 1863 1864 // C++0x nullptr_t is always a null pointer constant. 1865 if (getType()->isNullPtrType()) 1866 return true; 1867 1868 // This expression must be an integer type. 1869 if (!getType()->isIntegerType() || 1870 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1871 return false; 1872 1873 // If we have an integer constant expression, we need to *evaluate* it and 1874 // test for the value 0. 1875 llvm::APSInt Result; 1876 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1877} 1878 1879FieldDecl *Expr::getBitField() { 1880 Expr *E = this->IgnoreParens(); 1881 1882 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1883 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1884 if (Field->isBitField()) 1885 return Field; 1886 1887 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1888 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1889 return BinOp->getLHS()->getBitField(); 1890 1891 return 0; 1892} 1893 1894/// isArrow - Return true if the base expression is a pointer to vector, 1895/// return false if the base expression is a vector. 1896bool ExtVectorElementExpr::isArrow() const { 1897 return getBase()->getType()->isPointerType(); 1898} 1899 1900unsigned ExtVectorElementExpr::getNumElements() const { 1901 if (const VectorType *VT = getType()->getAs<VectorType>()) 1902 return VT->getNumElements(); 1903 return 1; 1904} 1905 1906/// containsDuplicateElements - Return true if any element access is repeated. 1907bool ExtVectorElementExpr::containsDuplicateElements() const { 1908 // FIXME: Refactor this code to an accessor on the AST node which returns the 1909 // "type" of component access, and share with code below and in Sema. 1910 llvm::StringRef Comp = Accessor->getName(); 1911 1912 // Halving swizzles do not contain duplicate elements. 1913 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1914 return false; 1915 1916 // Advance past s-char prefix on hex swizzles. 1917 if (Comp[0] == 's' || Comp[0] == 'S') 1918 Comp = Comp.substr(1); 1919 1920 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1921 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1922 return true; 1923 1924 return false; 1925} 1926 1927/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1928void ExtVectorElementExpr::getEncodedElementAccess( 1929 llvm::SmallVectorImpl<unsigned> &Elts) const { 1930 llvm::StringRef Comp = Accessor->getName(); 1931 if (Comp[0] == 's' || Comp[0] == 'S') 1932 Comp = Comp.substr(1); 1933 1934 bool isHi = Comp == "hi"; 1935 bool isLo = Comp == "lo"; 1936 bool isEven = Comp == "even"; 1937 bool isOdd = Comp == "odd"; 1938 1939 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1940 uint64_t Index; 1941 1942 if (isHi) 1943 Index = e + i; 1944 else if (isLo) 1945 Index = i; 1946 else if (isEven) 1947 Index = 2 * i; 1948 else if (isOdd) 1949 Index = 2 * i + 1; 1950 else 1951 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1952 1953 Elts.push_back(Index); 1954 } 1955} 1956 1957// constructor for instance messages. 1958ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1959 QualType retType, ObjCMethodDecl *mproto, 1960 SourceLocation LBrac, SourceLocation RBrac, 1961 Expr **ArgExprs, unsigned nargs) 1962 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1963 MethodProto(mproto) { 1964 NumArgs = nargs; 1965 SubExprs = new Stmt*[NumArgs+1]; 1966 SubExprs[RECEIVER] = receiver; 1967 if (NumArgs) { 1968 for (unsigned i = 0; i != NumArgs; ++i) 1969 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1970 } 1971 LBracloc = LBrac; 1972 RBracloc = RBrac; 1973} 1974 1975// constructor for class messages. 1976// FIXME: clsName should be typed to ObjCInterfaceType 1977ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1978 QualType retType, ObjCMethodDecl *mproto, 1979 SourceLocation LBrac, SourceLocation RBrac, 1980 Expr **ArgExprs, unsigned nargs) 1981 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1982 MethodProto(mproto) { 1983 NumArgs = nargs; 1984 SubExprs = new Stmt*[NumArgs+1]; 1985 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1986 if (NumArgs) { 1987 for (unsigned i = 0; i != NumArgs; ++i) 1988 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1989 } 1990 LBracloc = LBrac; 1991 RBracloc = RBrac; 1992} 1993 1994// constructor for class messages. 1995ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 1996 QualType retType, ObjCMethodDecl *mproto, 1997 SourceLocation LBrac, SourceLocation RBrac, 1998 Expr **ArgExprs, unsigned nargs) 1999: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2000MethodProto(mproto) { 2001 NumArgs = nargs; 2002 SubExprs = new Stmt*[NumArgs+1]; 2003 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2004 if (NumArgs) { 2005 for (unsigned i = 0; i != NumArgs; ++i) 2006 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2007 } 2008 LBracloc = LBrac; 2009 RBracloc = RBrac; 2010} 2011 2012ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2013 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2014 switch (x & Flags) { 2015 default: 2016 assert(false && "Invalid ObjCMessageExpr."); 2017 case IsInstMeth: 2018 return ClassInfo(0, 0); 2019 case IsClsMethDeclUnknown: 2020 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2021 case IsClsMethDeclKnown: { 2022 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2023 return ClassInfo(D, D->getIdentifier()); 2024 } 2025 } 2026} 2027 2028void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2029 if (CI.first == 0 && CI.second == 0) 2030 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2031 else if (CI.first == 0) 2032 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2033 else 2034 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2035} 2036 2037 2038bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2039 return getCond()->EvaluateAsInt(C) != 0; 2040} 2041 2042void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2043 unsigned NumExprs) { 2044 if (SubExprs) C.Deallocate(SubExprs); 2045 2046 SubExprs = new (C) Stmt* [NumExprs]; 2047 this->NumExprs = NumExprs; 2048 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2049} 2050 2051void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2052 DestroyChildren(C); 2053 if (SubExprs) C.Deallocate(SubExprs); 2054 this->~ShuffleVectorExpr(); 2055 C.Deallocate(this); 2056} 2057 2058void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2059 // Override default behavior of traversing children. If this has a type 2060 // operand and the type is a variable-length array, the child iteration 2061 // will iterate over the size expression. However, this expression belongs 2062 // to the type, not to this, so we don't want to delete it. 2063 // We still want to delete this expression. 2064 if (isArgumentType()) { 2065 this->~SizeOfAlignOfExpr(); 2066 C.Deallocate(this); 2067 } 2068 else 2069 Expr::DoDestroy(C); 2070} 2071 2072//===----------------------------------------------------------------------===// 2073// DesignatedInitExpr 2074//===----------------------------------------------------------------------===// 2075 2076IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2077 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2078 if (Field.NameOrField & 0x01) 2079 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2080 else 2081 return getField()->getIdentifier(); 2082} 2083 2084DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2085 const Designator *Designators, 2086 SourceLocation EqualOrColonLoc, 2087 bool GNUSyntax, 2088 Expr **IndexExprs, 2089 unsigned NumIndexExprs, 2090 Expr *Init) 2091 : Expr(DesignatedInitExprClass, Ty, 2092 Init->isTypeDependent(), Init->isValueDependent()), 2093 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2094 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2095 this->Designators = new Designator[NumDesignators]; 2096 2097 // Record the initializer itself. 2098 child_iterator Child = child_begin(); 2099 *Child++ = Init; 2100 2101 // Copy the designators and their subexpressions, computing 2102 // value-dependence along the way. 2103 unsigned IndexIdx = 0; 2104 for (unsigned I = 0; I != NumDesignators; ++I) { 2105 this->Designators[I] = Designators[I]; 2106 2107 if (this->Designators[I].isArrayDesignator()) { 2108 // Compute type- and value-dependence. 2109 Expr *Index = IndexExprs[IndexIdx]; 2110 ValueDependent = ValueDependent || 2111 Index->isTypeDependent() || Index->isValueDependent(); 2112 2113 // Copy the index expressions into permanent storage. 2114 *Child++ = IndexExprs[IndexIdx++]; 2115 } else if (this->Designators[I].isArrayRangeDesignator()) { 2116 // Compute type- and value-dependence. 2117 Expr *Start = IndexExprs[IndexIdx]; 2118 Expr *End = IndexExprs[IndexIdx + 1]; 2119 ValueDependent = ValueDependent || 2120 Start->isTypeDependent() || Start->isValueDependent() || 2121 End->isTypeDependent() || End->isValueDependent(); 2122 2123 // Copy the start/end expressions into permanent storage. 2124 *Child++ = IndexExprs[IndexIdx++]; 2125 *Child++ = IndexExprs[IndexIdx++]; 2126 } 2127 } 2128 2129 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2130} 2131 2132DesignatedInitExpr * 2133DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2134 unsigned NumDesignators, 2135 Expr **IndexExprs, unsigned NumIndexExprs, 2136 SourceLocation ColonOrEqualLoc, 2137 bool UsesColonSyntax, Expr *Init) { 2138 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2139 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2140 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2141 ColonOrEqualLoc, UsesColonSyntax, 2142 IndexExprs, NumIndexExprs, Init); 2143} 2144 2145DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2146 unsigned NumIndexExprs) { 2147 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2148 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2149 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2150} 2151 2152void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2153 unsigned NumDesigs) { 2154 if (Designators) 2155 delete [] Designators; 2156 2157 Designators = new Designator[NumDesigs]; 2158 NumDesignators = NumDesigs; 2159 for (unsigned I = 0; I != NumDesigs; ++I) 2160 Designators[I] = Desigs[I]; 2161} 2162 2163SourceRange DesignatedInitExpr::getSourceRange() const { 2164 SourceLocation StartLoc; 2165 Designator &First = 2166 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2167 if (First.isFieldDesignator()) { 2168 if (GNUSyntax) 2169 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2170 else 2171 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2172 } else 2173 StartLoc = 2174 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2175 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2176} 2177 2178Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2179 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2180 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2181 Ptr += sizeof(DesignatedInitExpr); 2182 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2183 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2184} 2185 2186Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2187 assert(D.Kind == Designator::ArrayRangeDesignator && 2188 "Requires array range designator"); 2189 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2190 Ptr += sizeof(DesignatedInitExpr); 2191 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2192 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2193} 2194 2195Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2196 assert(D.Kind == Designator::ArrayRangeDesignator && 2197 "Requires array range designator"); 2198 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2199 Ptr += sizeof(DesignatedInitExpr); 2200 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2201 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2202} 2203 2204/// \brief Replaces the designator at index @p Idx with the series 2205/// of designators in [First, Last). 2206void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2207 const Designator *First, 2208 const Designator *Last) { 2209 unsigned NumNewDesignators = Last - First; 2210 if (NumNewDesignators == 0) { 2211 std::copy_backward(Designators + Idx + 1, 2212 Designators + NumDesignators, 2213 Designators + Idx); 2214 --NumNewDesignators; 2215 return; 2216 } else if (NumNewDesignators == 1) { 2217 Designators[Idx] = *First; 2218 return; 2219 } 2220 2221 Designator *NewDesignators 2222 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2223 std::copy(Designators, Designators + Idx, NewDesignators); 2224 std::copy(First, Last, NewDesignators + Idx); 2225 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2226 NewDesignators + Idx + NumNewDesignators); 2227 delete [] Designators; 2228 Designators = NewDesignators; 2229 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2230} 2231 2232void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2233 delete [] Designators; 2234 Expr::DoDestroy(C); 2235} 2236 2237ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2238 Expr **exprs, unsigned nexprs, 2239 SourceLocation rparenloc) 2240: Expr(ParenListExprClass, QualType(), 2241 hasAnyTypeDependentArguments(exprs, nexprs), 2242 hasAnyValueDependentArguments(exprs, nexprs)), 2243 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2244 2245 Exprs = new (C) Stmt*[nexprs]; 2246 for (unsigned i = 0; i != nexprs; ++i) 2247 Exprs[i] = exprs[i]; 2248} 2249 2250void ParenListExpr::DoDestroy(ASTContext& C) { 2251 DestroyChildren(C); 2252 if (Exprs) C.Deallocate(Exprs); 2253 this->~ParenListExpr(); 2254 C.Deallocate(this); 2255} 2256 2257//===----------------------------------------------------------------------===// 2258// ExprIterator. 2259//===----------------------------------------------------------------------===// 2260 2261Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2262Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2263Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2264const Expr* ConstExprIterator::operator[](size_t idx) const { 2265 return cast<Expr>(I[idx]); 2266} 2267const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2268const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2269 2270//===----------------------------------------------------------------------===// 2271// Child Iterators for iterating over subexpressions/substatements 2272//===----------------------------------------------------------------------===// 2273 2274// DeclRefExpr 2275Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2276Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2277 2278// ObjCIvarRefExpr 2279Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2280Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2281 2282// ObjCPropertyRefExpr 2283Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2284Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2285 2286// ObjCImplicitSetterGetterRefExpr 2287Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2288 return &Base; 2289} 2290Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2291 return &Base+1; 2292} 2293 2294// ObjCSuperExpr 2295Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2296Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2297 2298// ObjCIsaExpr 2299Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2300Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2301 2302// PredefinedExpr 2303Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2304Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2305 2306// IntegerLiteral 2307Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2308Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2309 2310// CharacterLiteral 2311Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2312Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2313 2314// FloatingLiteral 2315Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2316Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2317 2318// ImaginaryLiteral 2319Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2320Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2321 2322// StringLiteral 2323Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2324Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2325 2326// ParenExpr 2327Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2328Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2329 2330// UnaryOperator 2331Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2332Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2333 2334// SizeOfAlignOfExpr 2335Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2336 // If this is of a type and the type is a VLA type (and not a typedef), the 2337 // size expression of the VLA needs to be treated as an executable expression. 2338 // Why isn't this weirdness documented better in StmtIterator? 2339 if (isArgumentType()) { 2340 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2341 getArgumentType().getTypePtr())) 2342 return child_iterator(T); 2343 return child_iterator(); 2344 } 2345 return child_iterator(&Argument.Ex); 2346} 2347Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2348 if (isArgumentType()) 2349 return child_iterator(); 2350 return child_iterator(&Argument.Ex + 1); 2351} 2352 2353// ArraySubscriptExpr 2354Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2355 return &SubExprs[0]; 2356} 2357Stmt::child_iterator ArraySubscriptExpr::child_end() { 2358 return &SubExprs[0]+END_EXPR; 2359} 2360 2361// CallExpr 2362Stmt::child_iterator CallExpr::child_begin() { 2363 return &SubExprs[0]; 2364} 2365Stmt::child_iterator CallExpr::child_end() { 2366 return &SubExprs[0]+NumArgs+ARGS_START; 2367} 2368 2369// MemberExpr 2370Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2371Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2372 2373// ExtVectorElementExpr 2374Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2375Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2376 2377// CompoundLiteralExpr 2378Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2379Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2380 2381// CastExpr 2382Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2383Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2384 2385// BinaryOperator 2386Stmt::child_iterator BinaryOperator::child_begin() { 2387 return &SubExprs[0]; 2388} 2389Stmt::child_iterator BinaryOperator::child_end() { 2390 return &SubExprs[0]+END_EXPR; 2391} 2392 2393// ConditionalOperator 2394Stmt::child_iterator ConditionalOperator::child_begin() { 2395 return &SubExprs[0]; 2396} 2397Stmt::child_iterator ConditionalOperator::child_end() { 2398 return &SubExprs[0]+END_EXPR; 2399} 2400 2401// AddrLabelExpr 2402Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2403Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2404 2405// StmtExpr 2406Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2407Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2408 2409// TypesCompatibleExpr 2410Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2411 return child_iterator(); 2412} 2413 2414Stmt::child_iterator TypesCompatibleExpr::child_end() { 2415 return child_iterator(); 2416} 2417 2418// ChooseExpr 2419Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2420Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2421 2422// GNUNullExpr 2423Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2424Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2425 2426// ShuffleVectorExpr 2427Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2428 return &SubExprs[0]; 2429} 2430Stmt::child_iterator ShuffleVectorExpr::child_end() { 2431 return &SubExprs[0]+NumExprs; 2432} 2433 2434// VAArgExpr 2435Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2436Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2437 2438// InitListExpr 2439Stmt::child_iterator InitListExpr::child_begin() { 2440 return InitExprs.size() ? &InitExprs[0] : 0; 2441} 2442Stmt::child_iterator InitListExpr::child_end() { 2443 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2444} 2445 2446// DesignatedInitExpr 2447Stmt::child_iterator DesignatedInitExpr::child_begin() { 2448 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2449 Ptr += sizeof(DesignatedInitExpr); 2450 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2451} 2452Stmt::child_iterator DesignatedInitExpr::child_end() { 2453 return child_iterator(&*child_begin() + NumSubExprs); 2454} 2455 2456// ImplicitValueInitExpr 2457Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2458 return child_iterator(); 2459} 2460 2461Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2462 return child_iterator(); 2463} 2464 2465// ParenListExpr 2466Stmt::child_iterator ParenListExpr::child_begin() { 2467 return &Exprs[0]; 2468} 2469Stmt::child_iterator ParenListExpr::child_end() { 2470 return &Exprs[0]+NumExprs; 2471} 2472 2473// ObjCStringLiteral 2474Stmt::child_iterator ObjCStringLiteral::child_begin() { 2475 return &String; 2476} 2477Stmt::child_iterator ObjCStringLiteral::child_end() { 2478 return &String+1; 2479} 2480 2481// ObjCEncodeExpr 2482Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2483Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2484 2485// ObjCSelectorExpr 2486Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2487 return child_iterator(); 2488} 2489Stmt::child_iterator ObjCSelectorExpr::child_end() { 2490 return child_iterator(); 2491} 2492 2493// ObjCProtocolExpr 2494Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2495 return child_iterator(); 2496} 2497Stmt::child_iterator ObjCProtocolExpr::child_end() { 2498 return child_iterator(); 2499} 2500 2501// ObjCMessageExpr 2502Stmt::child_iterator ObjCMessageExpr::child_begin() { 2503 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2504} 2505Stmt::child_iterator ObjCMessageExpr::child_end() { 2506 return &SubExprs[0]+ARGS_START+getNumArgs(); 2507} 2508 2509// Blocks 2510Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2511Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2512 2513Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2514Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2515