Expr.cpp revision 161755a09898c95d21bfff33707da9ca41cd53c5
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 if (const Expr *Init = Var->getAnyInitializer()) 103 if (Init->isValueDependent()) 104 ValueDependent = true; 105 } 106 } 107 // (TD) - a nested-name-specifier or a qualified-id that names a 108 // member of an unknown specialization. 109 // (handled by DependentScopeDeclRefExpr) 110} 111 112DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 113 SourceRange QualifierRange, 114 ValueDecl *D, SourceLocation NameLoc, 115 const TemplateArgumentListInfo *TemplateArgs, 116 QualType T) 117 : Expr(DeclRefExprClass, T, false, false), 118 DecoratedD(D, 119 (Qualifier? HasQualifierFlag : 0) | 120 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 121 Loc(NameLoc) { 122 if (Qualifier) { 123 NameQualifier *NQ = getNameQualifier(); 124 NQ->NNS = Qualifier; 125 NQ->Range = QualifierRange; 126 } 127 128 if (TemplateArgs) 129 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 130 131 computeDependence(); 132} 133 134DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 135 NestedNameSpecifier *Qualifier, 136 SourceRange QualifierRange, 137 ValueDecl *D, 138 SourceLocation NameLoc, 139 QualType T, 140 const TemplateArgumentListInfo *TemplateArgs) { 141 std::size_t Size = sizeof(DeclRefExpr); 142 if (Qualifier != 0) 143 Size += sizeof(NameQualifier); 144 145 if (TemplateArgs) 146 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 147 148 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 149 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 150 TemplateArgs, T); 151} 152 153SourceRange DeclRefExpr::getSourceRange() const { 154 // FIXME: Does not handle multi-token names well, e.g., operator[]. 155 SourceRange R(Loc); 156 157 if (hasQualifier()) 158 R.setBegin(getQualifierRange().getBegin()); 159 if (hasExplicitTemplateArgumentList()) 160 R.setEnd(getRAngleLoc()); 161 return R; 162} 163 164// FIXME: Maybe this should use DeclPrinter with a special "print predefined 165// expr" policy instead. 166std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 167 ASTContext &Context = CurrentDecl->getASTContext(); 168 169 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 170 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 171 return FD->getNameAsString(); 172 173 llvm::SmallString<256> Name; 174 llvm::raw_svector_ostream Out(Name); 175 176 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 177 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 178 Out << "virtual "; 179 if (MD->isStatic()) 180 Out << "static "; 181 } 182 183 PrintingPolicy Policy(Context.getLangOptions()); 184 185 std::string Proto = FD->getQualifiedNameAsString(Policy); 186 187 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 188 const FunctionProtoType *FT = 0; 189 if (FD->hasWrittenPrototype()) 190 FT = dyn_cast<FunctionProtoType>(AFT); 191 192 Proto += "("; 193 if (FT) { 194 llvm::raw_string_ostream POut(Proto); 195 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 196 if (i) POut << ", "; 197 std::string Param; 198 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 199 POut << Param; 200 } 201 202 if (FT->isVariadic()) { 203 if (FD->getNumParams()) POut << ", "; 204 POut << "..."; 205 } 206 } 207 Proto += ")"; 208 209 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 210 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 211 if (ThisQuals.hasConst()) 212 Proto += " const"; 213 if (ThisQuals.hasVolatile()) 214 Proto += " volatile"; 215 } 216 217 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 218 AFT->getResultType().getAsStringInternal(Proto, Policy); 219 220 Out << Proto; 221 222 Out.flush(); 223 return Name.str().str(); 224 } 225 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 226 llvm::SmallString<256> Name; 227 llvm::raw_svector_ostream Out(Name); 228 Out << (MD->isInstanceMethod() ? '-' : '+'); 229 Out << '['; 230 231 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 232 // a null check to avoid a crash. 233 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 234 Out << ID->getNameAsString(); 235 236 if (const ObjCCategoryImplDecl *CID = 237 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 238 Out << '('; 239 Out << CID->getNameAsString(); 240 Out << ')'; 241 } 242 Out << ' '; 243 Out << MD->getSelector().getAsString(); 244 Out << ']'; 245 246 Out.flush(); 247 return Name.str().str(); 248 } 249 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 250 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 251 return "top level"; 252 } 253 return ""; 254} 255 256/// getValueAsApproximateDouble - This returns the value as an inaccurate 257/// double. Note that this may cause loss of precision, but is useful for 258/// debugging dumps, etc. 259double FloatingLiteral::getValueAsApproximateDouble() const { 260 llvm::APFloat V = getValue(); 261 bool ignored; 262 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 263 &ignored); 264 return V.convertToDouble(); 265} 266 267StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 268 unsigned ByteLength, bool Wide, 269 QualType Ty, 270 const SourceLocation *Loc, 271 unsigned NumStrs) { 272 // Allocate enough space for the StringLiteral plus an array of locations for 273 // any concatenated string tokens. 274 void *Mem = C.Allocate(sizeof(StringLiteral)+ 275 sizeof(SourceLocation)*(NumStrs-1), 276 llvm::alignof<StringLiteral>()); 277 StringLiteral *SL = new (Mem) StringLiteral(Ty); 278 279 // OPTIMIZE: could allocate this appended to the StringLiteral. 280 char *AStrData = new (C, 1) char[ByteLength]; 281 memcpy(AStrData, StrData, ByteLength); 282 SL->StrData = AStrData; 283 SL->ByteLength = ByteLength; 284 SL->IsWide = Wide; 285 SL->TokLocs[0] = Loc[0]; 286 SL->NumConcatenated = NumStrs; 287 288 if (NumStrs != 1) 289 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 290 return SL; 291} 292 293StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 294 void *Mem = C.Allocate(sizeof(StringLiteral)+ 295 sizeof(SourceLocation)*(NumStrs-1), 296 llvm::alignof<StringLiteral>()); 297 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 298 SL->StrData = 0; 299 SL->ByteLength = 0; 300 SL->NumConcatenated = NumStrs; 301 return SL; 302} 303 304void StringLiteral::DoDestroy(ASTContext &C) { 305 C.Deallocate(const_cast<char*>(StrData)); 306 Expr::DoDestroy(C); 307} 308 309void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 310 if (StrData) 311 C.Deallocate(const_cast<char*>(StrData)); 312 313 char *AStrData = new (C, 1) char[Str.size()]; 314 memcpy(AStrData, Str.data(), Str.size()); 315 StrData = AStrData; 316 ByteLength = Str.size(); 317} 318 319/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 320/// corresponds to, e.g. "sizeof" or "[pre]++". 321const char *UnaryOperator::getOpcodeStr(Opcode Op) { 322 switch (Op) { 323 default: assert(0 && "Unknown unary operator"); 324 case PostInc: return "++"; 325 case PostDec: return "--"; 326 case PreInc: return "++"; 327 case PreDec: return "--"; 328 case AddrOf: return "&"; 329 case Deref: return "*"; 330 case Plus: return "+"; 331 case Minus: return "-"; 332 case Not: return "~"; 333 case LNot: return "!"; 334 case Real: return "__real"; 335 case Imag: return "__imag"; 336 case Extension: return "__extension__"; 337 case OffsetOf: return "__builtin_offsetof"; 338 } 339} 340 341UnaryOperator::Opcode 342UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 343 switch (OO) { 344 default: assert(false && "No unary operator for overloaded function"); 345 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 346 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 347 case OO_Amp: return AddrOf; 348 case OO_Star: return Deref; 349 case OO_Plus: return Plus; 350 case OO_Minus: return Minus; 351 case OO_Tilde: return Not; 352 case OO_Exclaim: return LNot; 353 } 354} 355 356OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 357 switch (Opc) { 358 case PostInc: case PreInc: return OO_PlusPlus; 359 case PostDec: case PreDec: return OO_MinusMinus; 360 case AddrOf: return OO_Amp; 361 case Deref: return OO_Star; 362 case Plus: return OO_Plus; 363 case Minus: return OO_Minus; 364 case Not: return OO_Tilde; 365 case LNot: return OO_Exclaim; 366 default: return OO_None; 367 } 368} 369 370 371//===----------------------------------------------------------------------===// 372// Postfix Operators. 373//===----------------------------------------------------------------------===// 374 375CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 376 unsigned numargs, QualType t, SourceLocation rparenloc) 377 : Expr(SC, t, 378 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 379 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 380 NumArgs(numargs) { 381 382 SubExprs = new (C) Stmt*[numargs+1]; 383 SubExprs[FN] = fn; 384 for (unsigned i = 0; i != numargs; ++i) 385 SubExprs[i+ARGS_START] = args[i]; 386 387 RParenLoc = rparenloc; 388} 389 390CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 391 QualType t, SourceLocation rparenloc) 392 : Expr(CallExprClass, t, 393 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 394 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 395 NumArgs(numargs) { 396 397 SubExprs = new (C) Stmt*[numargs+1]; 398 SubExprs[FN] = fn; 399 for (unsigned i = 0; i != numargs; ++i) 400 SubExprs[i+ARGS_START] = args[i]; 401 402 RParenLoc = rparenloc; 403} 404 405CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 406 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 407 SubExprs = new (C) Stmt*[1]; 408} 409 410void CallExpr::DoDestroy(ASTContext& C) { 411 DestroyChildren(C); 412 if (SubExprs) C.Deallocate(SubExprs); 413 this->~CallExpr(); 414 C.Deallocate(this); 415} 416 417Decl *CallExpr::getCalleeDecl() { 418 Expr *CEE = getCallee()->IgnoreParenCasts(); 419 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 420 return DRE->getDecl(); 421 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 422 return ME->getMemberDecl(); 423 424 return 0; 425} 426 427FunctionDecl *CallExpr::getDirectCallee() { 428 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 429} 430 431/// setNumArgs - This changes the number of arguments present in this call. 432/// Any orphaned expressions are deleted by this, and any new operands are set 433/// to null. 434void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 435 // No change, just return. 436 if (NumArgs == getNumArgs()) return; 437 438 // If shrinking # arguments, just delete the extras and forgot them. 439 if (NumArgs < getNumArgs()) { 440 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 441 getArg(i)->Destroy(C); 442 this->NumArgs = NumArgs; 443 return; 444 } 445 446 // Otherwise, we are growing the # arguments. New an bigger argument array. 447 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 448 // Copy over args. 449 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 450 NewSubExprs[i] = SubExprs[i]; 451 // Null out new args. 452 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 453 NewSubExprs[i] = 0; 454 455 if (SubExprs) C.Deallocate(SubExprs); 456 SubExprs = NewSubExprs; 457 this->NumArgs = NumArgs; 458} 459 460/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 461/// not, return 0. 462unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 463 // All simple function calls (e.g. func()) are implicitly cast to pointer to 464 // function. As a result, we try and obtain the DeclRefExpr from the 465 // ImplicitCastExpr. 466 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 467 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 468 return 0; 469 470 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 471 if (!DRE) 472 return 0; 473 474 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 475 if (!FDecl) 476 return 0; 477 478 if (!FDecl->getIdentifier()) 479 return 0; 480 481 return FDecl->getBuiltinID(); 482} 483 484QualType CallExpr::getCallReturnType() const { 485 QualType CalleeType = getCallee()->getType(); 486 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 487 CalleeType = FnTypePtr->getPointeeType(); 488 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 489 CalleeType = BPT->getPointeeType(); 490 491 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 492 return FnType->getResultType(); 493} 494 495MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 496 NestedNameSpecifier *qual, 497 SourceRange qualrange, 498 ValueDecl *memberdecl, 499 DeclAccessPair founddecl, 500 SourceLocation l, 501 const TemplateArgumentListInfo *targs, 502 QualType ty) { 503 std::size_t Size = sizeof(MemberExpr); 504 505 bool hasQualOrFound = (qual != 0 || 506 founddecl.getDecl() != memberdecl || 507 founddecl.getAccess() != memberdecl->getAccess()); 508 if (hasQualOrFound) 509 Size += sizeof(MemberNameQualifier); 510 511 if (targs) 512 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 513 514 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 515 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, l, ty); 516 517 if (hasQualOrFound) { 518 if (qual && qual->isDependent()) { 519 E->setValueDependent(true); 520 E->setTypeDependent(true); 521 } 522 E->HasQualifierOrFoundDecl = true; 523 524 MemberNameQualifier *NQ = E->getMemberQualifier(); 525 NQ->NNS = qual; 526 NQ->Range = qualrange; 527 NQ->FoundDecl = founddecl; 528 } 529 530 if (targs) { 531 E->HasExplicitTemplateArgumentList = true; 532 E->getExplicitTemplateArgumentList()->initializeFrom(*targs); 533 } 534 535 return E; 536} 537 538const char *CastExpr::getCastKindName() const { 539 switch (getCastKind()) { 540 case CastExpr::CK_Unknown: 541 return "Unknown"; 542 case CastExpr::CK_BitCast: 543 return "BitCast"; 544 case CastExpr::CK_NoOp: 545 return "NoOp"; 546 case CastExpr::CK_BaseToDerived: 547 return "BaseToDerived"; 548 case CastExpr::CK_DerivedToBase: 549 return "DerivedToBase"; 550 case CastExpr::CK_UncheckedDerivedToBase: 551 return "UncheckedDerivedToBase"; 552 case CastExpr::CK_Dynamic: 553 return "Dynamic"; 554 case CastExpr::CK_ToUnion: 555 return "ToUnion"; 556 case CastExpr::CK_ArrayToPointerDecay: 557 return "ArrayToPointerDecay"; 558 case CastExpr::CK_FunctionToPointerDecay: 559 return "FunctionToPointerDecay"; 560 case CastExpr::CK_NullToMemberPointer: 561 return "NullToMemberPointer"; 562 case CastExpr::CK_BaseToDerivedMemberPointer: 563 return "BaseToDerivedMemberPointer"; 564 case CastExpr::CK_DerivedToBaseMemberPointer: 565 return "DerivedToBaseMemberPointer"; 566 case CastExpr::CK_UserDefinedConversion: 567 return "UserDefinedConversion"; 568 case CastExpr::CK_ConstructorConversion: 569 return "ConstructorConversion"; 570 case CastExpr::CK_IntegralToPointer: 571 return "IntegralToPointer"; 572 case CastExpr::CK_PointerToIntegral: 573 return "PointerToIntegral"; 574 case CastExpr::CK_ToVoid: 575 return "ToVoid"; 576 case CastExpr::CK_VectorSplat: 577 return "VectorSplat"; 578 case CastExpr::CK_IntegralCast: 579 return "IntegralCast"; 580 case CastExpr::CK_IntegralToFloating: 581 return "IntegralToFloating"; 582 case CastExpr::CK_FloatingToIntegral: 583 return "FloatingToIntegral"; 584 case CastExpr::CK_FloatingCast: 585 return "FloatingCast"; 586 case CastExpr::CK_MemberPointerToBoolean: 587 return "MemberPointerToBoolean"; 588 case CastExpr::CK_AnyPointerToObjCPointerCast: 589 return "AnyPointerToObjCPointerCast"; 590 case CastExpr::CK_AnyPointerToBlockPointerCast: 591 return "AnyPointerToBlockPointerCast"; 592 } 593 594 assert(0 && "Unhandled cast kind!"); 595 return 0; 596} 597 598Expr *CastExpr::getSubExprAsWritten() { 599 Expr *SubExpr = 0; 600 CastExpr *E = this; 601 do { 602 SubExpr = E->getSubExpr(); 603 604 // Skip any temporary bindings; they're implicit. 605 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 606 SubExpr = Binder->getSubExpr(); 607 608 // Conversions by constructor and conversion functions have a 609 // subexpression describing the call; strip it off. 610 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 611 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 612 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 613 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 614 615 // If the subexpression we're left with is an implicit cast, look 616 // through that, too. 617 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 618 619 return SubExpr; 620} 621 622/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 623/// corresponds to, e.g. "<<=". 624const char *BinaryOperator::getOpcodeStr(Opcode Op) { 625 switch (Op) { 626 case PtrMemD: return ".*"; 627 case PtrMemI: return "->*"; 628 case Mul: return "*"; 629 case Div: return "/"; 630 case Rem: return "%"; 631 case Add: return "+"; 632 case Sub: return "-"; 633 case Shl: return "<<"; 634 case Shr: return ">>"; 635 case LT: return "<"; 636 case GT: return ">"; 637 case LE: return "<="; 638 case GE: return ">="; 639 case EQ: return "=="; 640 case NE: return "!="; 641 case And: return "&"; 642 case Xor: return "^"; 643 case Or: return "|"; 644 case LAnd: return "&&"; 645 case LOr: return "||"; 646 case Assign: return "="; 647 case MulAssign: return "*="; 648 case DivAssign: return "/="; 649 case RemAssign: return "%="; 650 case AddAssign: return "+="; 651 case SubAssign: return "-="; 652 case ShlAssign: return "<<="; 653 case ShrAssign: return ">>="; 654 case AndAssign: return "&="; 655 case XorAssign: return "^="; 656 case OrAssign: return "|="; 657 case Comma: return ","; 658 } 659 660 return ""; 661} 662 663BinaryOperator::Opcode 664BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 665 switch (OO) { 666 default: assert(false && "Not an overloadable binary operator"); 667 case OO_Plus: return Add; 668 case OO_Minus: return Sub; 669 case OO_Star: return Mul; 670 case OO_Slash: return Div; 671 case OO_Percent: return Rem; 672 case OO_Caret: return Xor; 673 case OO_Amp: return And; 674 case OO_Pipe: return Or; 675 case OO_Equal: return Assign; 676 case OO_Less: return LT; 677 case OO_Greater: return GT; 678 case OO_PlusEqual: return AddAssign; 679 case OO_MinusEqual: return SubAssign; 680 case OO_StarEqual: return MulAssign; 681 case OO_SlashEqual: return DivAssign; 682 case OO_PercentEqual: return RemAssign; 683 case OO_CaretEqual: return XorAssign; 684 case OO_AmpEqual: return AndAssign; 685 case OO_PipeEqual: return OrAssign; 686 case OO_LessLess: return Shl; 687 case OO_GreaterGreater: return Shr; 688 case OO_LessLessEqual: return ShlAssign; 689 case OO_GreaterGreaterEqual: return ShrAssign; 690 case OO_EqualEqual: return EQ; 691 case OO_ExclaimEqual: return NE; 692 case OO_LessEqual: return LE; 693 case OO_GreaterEqual: return GE; 694 case OO_AmpAmp: return LAnd; 695 case OO_PipePipe: return LOr; 696 case OO_Comma: return Comma; 697 case OO_ArrowStar: return PtrMemI; 698 } 699} 700 701OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 702 static const OverloadedOperatorKind OverOps[] = { 703 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 704 OO_Star, OO_Slash, OO_Percent, 705 OO_Plus, OO_Minus, 706 OO_LessLess, OO_GreaterGreater, 707 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 708 OO_EqualEqual, OO_ExclaimEqual, 709 OO_Amp, 710 OO_Caret, 711 OO_Pipe, 712 OO_AmpAmp, 713 OO_PipePipe, 714 OO_Equal, OO_StarEqual, 715 OO_SlashEqual, OO_PercentEqual, 716 OO_PlusEqual, OO_MinusEqual, 717 OO_LessLessEqual, OO_GreaterGreaterEqual, 718 OO_AmpEqual, OO_CaretEqual, 719 OO_PipeEqual, 720 OO_Comma 721 }; 722 return OverOps[Opc]; 723} 724 725InitListExpr::InitListExpr(SourceLocation lbraceloc, 726 Expr **initExprs, unsigned numInits, 727 SourceLocation rbraceloc) 728 : Expr(InitListExprClass, QualType(), false, false), 729 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 730 UnionFieldInit(0), HadArrayRangeDesignator(false) 731{ 732 for (unsigned I = 0; I != numInits; ++I) { 733 if (initExprs[I]->isTypeDependent()) 734 TypeDependent = true; 735 if (initExprs[I]->isValueDependent()) 736 ValueDependent = true; 737 } 738 739 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 740} 741 742void InitListExpr::reserveInits(unsigned NumInits) { 743 if (NumInits > InitExprs.size()) 744 InitExprs.reserve(NumInits); 745} 746 747void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 748 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 749 Idx < LastIdx; ++Idx) 750 InitExprs[Idx]->Destroy(Context); 751 InitExprs.resize(NumInits, 0); 752} 753 754Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 755 if (Init >= InitExprs.size()) { 756 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 757 InitExprs.back() = expr; 758 return 0; 759 } 760 761 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 762 InitExprs[Init] = expr; 763 return Result; 764} 765 766/// getFunctionType - Return the underlying function type for this block. 767/// 768const FunctionType *BlockExpr::getFunctionType() const { 769 return getType()->getAs<BlockPointerType>()-> 770 getPointeeType()->getAs<FunctionType>(); 771} 772 773SourceLocation BlockExpr::getCaretLocation() const { 774 return TheBlock->getCaretLocation(); 775} 776const Stmt *BlockExpr::getBody() const { 777 return TheBlock->getBody(); 778} 779Stmt *BlockExpr::getBody() { 780 return TheBlock->getBody(); 781} 782 783 784//===----------------------------------------------------------------------===// 785// Generic Expression Routines 786//===----------------------------------------------------------------------===// 787 788/// isUnusedResultAWarning - Return true if this immediate expression should 789/// be warned about if the result is unused. If so, fill in Loc and Ranges 790/// with location to warn on and the source range[s] to report with the 791/// warning. 792bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 793 SourceRange &R2, ASTContext &Ctx) const { 794 // Don't warn if the expr is type dependent. The type could end up 795 // instantiating to void. 796 if (isTypeDependent()) 797 return false; 798 799 switch (getStmtClass()) { 800 default: 801 if (getType()->isVoidType()) 802 return false; 803 Loc = getExprLoc(); 804 R1 = getSourceRange(); 805 return true; 806 case ParenExprClass: 807 return cast<ParenExpr>(this)->getSubExpr()-> 808 isUnusedResultAWarning(Loc, R1, R2, Ctx); 809 case UnaryOperatorClass: { 810 const UnaryOperator *UO = cast<UnaryOperator>(this); 811 812 switch (UO->getOpcode()) { 813 default: break; 814 case UnaryOperator::PostInc: 815 case UnaryOperator::PostDec: 816 case UnaryOperator::PreInc: 817 case UnaryOperator::PreDec: // ++/-- 818 return false; // Not a warning. 819 case UnaryOperator::Deref: 820 // Dereferencing a volatile pointer is a side-effect. 821 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 822 return false; 823 break; 824 case UnaryOperator::Real: 825 case UnaryOperator::Imag: 826 // accessing a piece of a volatile complex is a side-effect. 827 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 828 .isVolatileQualified()) 829 return false; 830 break; 831 case UnaryOperator::Extension: 832 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 833 } 834 Loc = UO->getOperatorLoc(); 835 R1 = UO->getSubExpr()->getSourceRange(); 836 return true; 837 } 838 case BinaryOperatorClass: { 839 const BinaryOperator *BO = cast<BinaryOperator>(this); 840 // Consider comma to have side effects if the LHS or RHS does. 841 if (BO->getOpcode() == BinaryOperator::Comma) { 842 // ((foo = <blah>), 0) is an idiom for hiding the result (and 843 // lvalue-ness) of an assignment written in a macro. 844 if (IntegerLiteral *IE = 845 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 846 if (IE->getValue() == 0) 847 return false; 848 849 return (BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 850 BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 851 } 852 853 if (BO->isAssignmentOp()) 854 return false; 855 Loc = BO->getOperatorLoc(); 856 R1 = BO->getLHS()->getSourceRange(); 857 R2 = BO->getRHS()->getSourceRange(); 858 return true; 859 } 860 case CompoundAssignOperatorClass: 861 return false; 862 863 case ConditionalOperatorClass: { 864 // The condition must be evaluated, but if either the LHS or RHS is a 865 // warning, warn about them. 866 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 867 if (Exp->getLHS() && 868 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 869 return true; 870 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 871 } 872 873 case MemberExprClass: 874 // If the base pointer or element is to a volatile pointer/field, accessing 875 // it is a side effect. 876 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 877 return false; 878 Loc = cast<MemberExpr>(this)->getMemberLoc(); 879 R1 = SourceRange(Loc, Loc); 880 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 881 return true; 882 883 case ArraySubscriptExprClass: 884 // If the base pointer or element is to a volatile pointer/field, accessing 885 // it is a side effect. 886 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 887 return false; 888 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 889 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 890 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 891 return true; 892 893 case CallExprClass: 894 case CXXOperatorCallExprClass: 895 case CXXMemberCallExprClass: { 896 // If this is a direct call, get the callee. 897 const CallExpr *CE = cast<CallExpr>(this); 898 if (const Decl *FD = CE->getCalleeDecl()) { 899 // If the callee has attribute pure, const, or warn_unused_result, warn 900 // about it. void foo() { strlen("bar"); } should warn. 901 // 902 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 903 // updated to match for QoI. 904 if (FD->getAttr<WarnUnusedResultAttr>() || 905 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 906 Loc = CE->getCallee()->getLocStart(); 907 R1 = CE->getCallee()->getSourceRange(); 908 909 if (unsigned NumArgs = CE->getNumArgs()) 910 R2 = SourceRange(CE->getArg(0)->getLocStart(), 911 CE->getArg(NumArgs-1)->getLocEnd()); 912 return true; 913 } 914 } 915 return false; 916 } 917 918 case CXXTemporaryObjectExprClass: 919 case CXXConstructExprClass: 920 return false; 921 922 case ObjCMessageExprClass: { 923 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 924 const ObjCMethodDecl *MD = ME->getMethodDecl(); 925 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 926 Loc = getExprLoc(); 927 return true; 928 } 929 return false; 930 } 931 932 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 933#if 0 934 const ObjCImplicitSetterGetterRefExpr *Ref = 935 cast<ObjCImplicitSetterGetterRefExpr>(this); 936 // FIXME: We really want the location of the '.' here. 937 Loc = Ref->getLocation(); 938 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 939 if (Ref->getBase()) 940 R2 = Ref->getBase()->getSourceRange(); 941#else 942 Loc = getExprLoc(); 943 R1 = getSourceRange(); 944#endif 945 return true; 946 } 947 case StmtExprClass: { 948 // Statement exprs don't logically have side effects themselves, but are 949 // sometimes used in macros in ways that give them a type that is unused. 950 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 951 // however, if the result of the stmt expr is dead, we don't want to emit a 952 // warning. 953 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 954 if (!CS->body_empty()) 955 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 956 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 957 958 if (getType()->isVoidType()) 959 return false; 960 Loc = cast<StmtExpr>(this)->getLParenLoc(); 961 R1 = getSourceRange(); 962 return true; 963 } 964 case CStyleCastExprClass: 965 // If this is an explicit cast to void, allow it. People do this when they 966 // think they know what they're doing :). 967 if (getType()->isVoidType()) 968 return false; 969 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 970 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 971 return true; 972 case CXXFunctionalCastExprClass: { 973 if (getType()->isVoidType()) 974 return false; 975 const CastExpr *CE = cast<CastExpr>(this); 976 977 // If this is a cast to void or a constructor conversion, check the operand. 978 // Otherwise, the result of the cast is unused. 979 if (CE->getCastKind() == CastExpr::CK_ToVoid || 980 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 981 return (cast<CastExpr>(this)->getSubExpr() 982 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 983 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 984 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 985 return true; 986 } 987 988 case ImplicitCastExprClass: 989 // Check the operand, since implicit casts are inserted by Sema 990 return (cast<ImplicitCastExpr>(this) 991 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 992 993 case CXXDefaultArgExprClass: 994 return (cast<CXXDefaultArgExpr>(this) 995 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 996 997 case CXXNewExprClass: 998 // FIXME: In theory, there might be new expressions that don't have side 999 // effects (e.g. a placement new with an uninitialized POD). 1000 case CXXDeleteExprClass: 1001 return false; 1002 case CXXBindTemporaryExprClass: 1003 return (cast<CXXBindTemporaryExpr>(this) 1004 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1005 case CXXExprWithTemporariesClass: 1006 return (cast<CXXExprWithTemporaries>(this) 1007 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1008 } 1009} 1010 1011/// DeclCanBeLvalue - Determine whether the given declaration can be 1012/// an lvalue. This is a helper routine for isLvalue. 1013static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 1014 // C++ [temp.param]p6: 1015 // A non-type non-reference template-parameter is not an lvalue. 1016 if (const NonTypeTemplateParmDecl *NTTParm 1017 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 1018 return NTTParm->getType()->isReferenceType(); 1019 1020 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 1021 // C++ 3.10p2: An lvalue refers to an object or function. 1022 (Ctx.getLangOptions().CPlusPlus && 1023 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 1024} 1025 1026/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 1027/// incomplete type other than void. Nonarray expressions that can be lvalues: 1028/// - name, where name must be a variable 1029/// - e[i] 1030/// - (e), where e must be an lvalue 1031/// - e.name, where e must be an lvalue 1032/// - e->name 1033/// - *e, the type of e cannot be a function type 1034/// - string-constant 1035/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1036/// - reference type [C++ [expr]] 1037/// 1038Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1039 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1040 1041 isLvalueResult Res = isLvalueInternal(Ctx); 1042 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1043 return Res; 1044 1045 // first, check the type (C99 6.3.2.1). Expressions with function 1046 // type in C are not lvalues, but they can be lvalues in C++. 1047 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1048 return LV_NotObjectType; 1049 1050 // Allow qualified void which is an incomplete type other than void (yuck). 1051 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1052 return LV_IncompleteVoidType; 1053 1054 return LV_Valid; 1055} 1056 1057// Check whether the expression can be sanely treated like an l-value 1058Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1059 switch (getStmtClass()) { 1060 case ObjCIsaExprClass: 1061 case StringLiteralClass: // C99 6.5.1p4 1062 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1063 return LV_Valid; 1064 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1065 // For vectors, make sure base is an lvalue (i.e. not a function call). 1066 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1067 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1068 return LV_Valid; 1069 case DeclRefExprClass: { // C99 6.5.1p2 1070 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1071 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1072 return LV_Valid; 1073 break; 1074 } 1075 case BlockDeclRefExprClass: { 1076 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1077 if (isa<VarDecl>(BDR->getDecl())) 1078 return LV_Valid; 1079 break; 1080 } 1081 case MemberExprClass: { 1082 const MemberExpr *m = cast<MemberExpr>(this); 1083 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1084 NamedDecl *Member = m->getMemberDecl(); 1085 // C++ [expr.ref]p4: 1086 // If E2 is declared to have type "reference to T", then E1.E2 1087 // is an lvalue. 1088 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1089 if (Value->getType()->isReferenceType()) 1090 return LV_Valid; 1091 1092 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1093 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1094 return LV_Valid; 1095 1096 // -- If E2 is a non-static data member [...]. If E1 is an 1097 // lvalue, then E1.E2 is an lvalue. 1098 if (isa<FieldDecl>(Member)) { 1099 if (m->isArrow()) 1100 return LV_Valid; 1101 return m->getBase()->isLvalue(Ctx); 1102 } 1103 1104 // -- If it refers to a static member function [...], then 1105 // E1.E2 is an lvalue. 1106 // -- Otherwise, if E1.E2 refers to a non-static member 1107 // function [...], then E1.E2 is not an lvalue. 1108 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1109 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1110 1111 // -- If E2 is a member enumerator [...], the expression E1.E2 1112 // is not an lvalue. 1113 if (isa<EnumConstantDecl>(Member)) 1114 return LV_InvalidExpression; 1115 1116 // Not an lvalue. 1117 return LV_InvalidExpression; 1118 } 1119 1120 // C99 6.5.2.3p4 1121 if (m->isArrow()) 1122 return LV_Valid; 1123 Expr *BaseExp = m->getBase(); 1124 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass || 1125 BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) 1126 return LV_SubObjCPropertySetting; 1127 return 1128 BaseExp->isLvalue(Ctx); 1129 } 1130 case UnaryOperatorClass: 1131 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1132 return LV_Valid; // C99 6.5.3p4 1133 1134 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1135 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1136 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1137 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1138 1139 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1140 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1141 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1142 return LV_Valid; 1143 break; 1144 case ImplicitCastExprClass: 1145 if (cast<ImplicitCastExpr>(this)->isLvalueCast()) 1146 return LV_Valid; 1147 1148 // If this is a conversion to a class temporary, make a note of 1149 // that. 1150 if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType()) 1151 return LV_ClassTemporary; 1152 1153 break; 1154 case ParenExprClass: // C99 6.5.1p5 1155 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1156 case BinaryOperatorClass: 1157 case CompoundAssignOperatorClass: { 1158 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1159 1160 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1161 BinOp->getOpcode() == BinaryOperator::Comma) 1162 return BinOp->getRHS()->isLvalue(Ctx); 1163 1164 // C++ [expr.mptr.oper]p6 1165 // The result of a .* expression is an lvalue only if its first operand is 1166 // an lvalue and its second operand is a pointer to data member. 1167 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1168 !BinOp->getType()->isFunctionType()) 1169 return BinOp->getLHS()->isLvalue(Ctx); 1170 1171 // The result of an ->* expression is an lvalue only if its second operand 1172 // is a pointer to data member. 1173 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1174 !BinOp->getType()->isFunctionType()) { 1175 QualType Ty = BinOp->getRHS()->getType(); 1176 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1177 return LV_Valid; 1178 } 1179 1180 if (!BinOp->isAssignmentOp()) 1181 return LV_InvalidExpression; 1182 1183 if (Ctx.getLangOptions().CPlusPlus) 1184 // C++ [expr.ass]p1: 1185 // The result of an assignment operation [...] is an lvalue. 1186 return LV_Valid; 1187 1188 1189 // C99 6.5.16: 1190 // An assignment expression [...] is not an lvalue. 1191 return LV_InvalidExpression; 1192 } 1193 case CallExprClass: 1194 case CXXOperatorCallExprClass: 1195 case CXXMemberCallExprClass: { 1196 // C++0x [expr.call]p10 1197 // A function call is an lvalue if and only if the result type 1198 // is an lvalue reference. 1199 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1200 if (ReturnType->isLValueReferenceType()) 1201 return LV_Valid; 1202 1203 // If the function is returning a class temporary, make a note of 1204 // that. 1205 if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType()) 1206 return LV_ClassTemporary; 1207 1208 break; 1209 } 1210 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1211 // FIXME: Is this what we want in C++? 1212 return LV_Valid; 1213 case ChooseExprClass: 1214 // __builtin_choose_expr is an lvalue if the selected operand is. 1215 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1216 case ExtVectorElementExprClass: 1217 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1218 return LV_DuplicateVectorComponents; 1219 return LV_Valid; 1220 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1221 return LV_Valid; 1222 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1223 return LV_Valid; 1224 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1225 return LV_Valid; 1226 case PredefinedExprClass: 1227 return LV_Valid; 1228 case UnresolvedLookupExprClass: 1229 return LV_Valid; 1230 case CXXDefaultArgExprClass: 1231 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1232 case CStyleCastExprClass: 1233 case CXXFunctionalCastExprClass: 1234 case CXXStaticCastExprClass: 1235 case CXXDynamicCastExprClass: 1236 case CXXReinterpretCastExprClass: 1237 case CXXConstCastExprClass: 1238 // The result of an explicit cast is an lvalue if the type we are 1239 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1240 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1241 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1242 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1243 isLValueReferenceType()) 1244 return LV_Valid; 1245 1246 // If this is a conversion to a class temporary, make a note of 1247 // that. 1248 if (Ctx.getLangOptions().CPlusPlus && 1249 cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType()) 1250 return LV_ClassTemporary; 1251 1252 break; 1253 case CXXTypeidExprClass: 1254 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1255 return LV_Valid; 1256 case CXXBindTemporaryExprClass: 1257 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1258 isLvalueInternal(Ctx); 1259 case CXXBindReferenceExprClass: 1260 // Something that's bound to a reference is always an lvalue. 1261 return LV_Valid; 1262 case ConditionalOperatorClass: { 1263 // Complicated handling is only for C++. 1264 if (!Ctx.getLangOptions().CPlusPlus) 1265 return LV_InvalidExpression; 1266 1267 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1268 // everywhere there's an object converted to an rvalue. Also, any other 1269 // casts should be wrapped by ImplicitCastExprs. There's just the special 1270 // case involving throws to work out. 1271 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1272 Expr *True = Cond->getTrueExpr(); 1273 Expr *False = Cond->getFalseExpr(); 1274 // C++0x 5.16p2 1275 // If either the second or the third operand has type (cv) void, [...] 1276 // the result [...] is an rvalue. 1277 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1278 return LV_InvalidExpression; 1279 1280 // Both sides must be lvalues for the result to be an lvalue. 1281 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1282 return LV_InvalidExpression; 1283 1284 // That's it. 1285 return LV_Valid; 1286 } 1287 1288 case Expr::CXXExprWithTemporariesClass: 1289 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1290 1291 case Expr::ObjCMessageExprClass: 1292 if (const ObjCMethodDecl *Method 1293 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1294 if (Method->getResultType()->isLValueReferenceType()) 1295 return LV_Valid; 1296 break; 1297 1298 case Expr::CXXConstructExprClass: 1299 case Expr::CXXTemporaryObjectExprClass: 1300 case Expr::CXXZeroInitValueExprClass: 1301 return LV_ClassTemporary; 1302 1303 default: 1304 break; 1305 } 1306 return LV_InvalidExpression; 1307} 1308 1309/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1310/// does not have an incomplete type, does not have a const-qualified type, and 1311/// if it is a structure or union, does not have any member (including, 1312/// recursively, any member or element of all contained aggregates or unions) 1313/// with a const-qualified type. 1314Expr::isModifiableLvalueResult 1315Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1316 isLvalueResult lvalResult = isLvalue(Ctx); 1317 1318 switch (lvalResult) { 1319 case LV_Valid: 1320 // C++ 3.10p11: Functions cannot be modified, but pointers to 1321 // functions can be modifiable. 1322 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1323 return MLV_NotObjectType; 1324 break; 1325 1326 case LV_NotObjectType: return MLV_NotObjectType; 1327 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1328 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1329 case LV_InvalidExpression: 1330 // If the top level is a C-style cast, and the subexpression is a valid 1331 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1332 // GCC extension. We don't support it, but we want to produce good 1333 // diagnostics when it happens so that the user knows why. 1334 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1335 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1336 if (Loc) 1337 *Loc = CE->getLParenLoc(); 1338 return MLV_LValueCast; 1339 } 1340 } 1341 return MLV_InvalidExpression; 1342 case LV_MemberFunction: return MLV_MemberFunction; 1343 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1344 case LV_ClassTemporary: 1345 return MLV_ClassTemporary; 1346 } 1347 1348 // The following is illegal: 1349 // void takeclosure(void (^C)(void)); 1350 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1351 // 1352 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1353 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1354 return MLV_NotBlockQualified; 1355 } 1356 1357 // Assigning to an 'implicit' property? 1358 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1359 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1360 if (Expr->getSetterMethod() == 0) 1361 return MLV_NoSetterProperty; 1362 } 1363 1364 QualType CT = Ctx.getCanonicalType(getType()); 1365 1366 if (CT.isConstQualified()) 1367 return MLV_ConstQualified; 1368 if (CT->isArrayType()) 1369 return MLV_ArrayType; 1370 if (CT->isIncompleteType()) 1371 return MLV_IncompleteType; 1372 1373 if (const RecordType *r = CT->getAs<RecordType>()) { 1374 if (r->hasConstFields()) 1375 return MLV_ConstQualified; 1376 } 1377 1378 return MLV_Valid; 1379} 1380 1381/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1382/// returns true, if it is; false otherwise. 1383bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1384 switch (getStmtClass()) { 1385 default: 1386 return false; 1387 case ObjCIvarRefExprClass: 1388 return true; 1389 case Expr::UnaryOperatorClass: 1390 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1391 case ParenExprClass: 1392 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1393 case ImplicitCastExprClass: 1394 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1395 case CStyleCastExprClass: 1396 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1397 case DeclRefExprClass: { 1398 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1399 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1400 if (VD->hasGlobalStorage()) 1401 return true; 1402 QualType T = VD->getType(); 1403 // dereferencing to a pointer is always a gc'able candidate, 1404 // unless it is __weak. 1405 return T->isPointerType() && 1406 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1407 } 1408 return false; 1409 } 1410 case MemberExprClass: { 1411 const MemberExpr *M = cast<MemberExpr>(this); 1412 return M->getBase()->isOBJCGCCandidate(Ctx); 1413 } 1414 case ArraySubscriptExprClass: 1415 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1416 } 1417} 1418Expr* Expr::IgnoreParens() { 1419 Expr* E = this; 1420 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1421 E = P->getSubExpr(); 1422 1423 return E; 1424} 1425 1426/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1427/// or CastExprs or ImplicitCastExprs, returning their operand. 1428Expr *Expr::IgnoreParenCasts() { 1429 Expr *E = this; 1430 while (true) { 1431 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1432 E = P->getSubExpr(); 1433 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1434 E = P->getSubExpr(); 1435 else 1436 return E; 1437 } 1438} 1439 1440/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1441/// value (including ptr->int casts of the same size). Strip off any 1442/// ParenExpr or CastExprs, returning their operand. 1443Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1444 Expr *E = this; 1445 while (true) { 1446 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1447 E = P->getSubExpr(); 1448 continue; 1449 } 1450 1451 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1452 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1453 // ptr<->int casts of the same width. We also ignore all identify casts. 1454 Expr *SE = P->getSubExpr(); 1455 1456 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1457 E = SE; 1458 continue; 1459 } 1460 1461 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1462 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1463 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1464 E = SE; 1465 continue; 1466 } 1467 } 1468 1469 return E; 1470 } 1471} 1472 1473bool Expr::isDefaultArgument() const { 1474 const Expr *E = this; 1475 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1476 E = ICE->getSubExprAsWritten(); 1477 1478 return isa<CXXDefaultArgExpr>(E); 1479} 1480 1481/// \brief Skip over any no-op casts and any temporary-binding 1482/// expressions. 1483static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1484 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1485 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1486 E = ICE->getSubExpr(); 1487 else 1488 break; 1489 } 1490 1491 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1492 E = BE->getSubExpr(); 1493 1494 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1495 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1496 E = ICE->getSubExpr(); 1497 else 1498 break; 1499 } 1500 1501 return E; 1502} 1503 1504const Expr *Expr::getTemporaryObject() const { 1505 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1506 1507 // A cast can produce a temporary object. The object's construction 1508 // is represented as a CXXConstructExpr. 1509 if (const CastExpr *Cast = dyn_cast<CastExpr>(E)) { 1510 // Only user-defined and constructor conversions can produce 1511 // temporary objects. 1512 if (Cast->getCastKind() != CastExpr::CK_ConstructorConversion && 1513 Cast->getCastKind() != CastExpr::CK_UserDefinedConversion) 1514 return 0; 1515 1516 // Strip off temporary bindings and no-op casts. 1517 const Expr *Sub = skipTemporaryBindingsAndNoOpCasts(Cast->getSubExpr()); 1518 1519 // If this is a constructor conversion, see if we have an object 1520 // construction. 1521 if (Cast->getCastKind() == CastExpr::CK_ConstructorConversion) 1522 return dyn_cast<CXXConstructExpr>(Sub); 1523 1524 // If this is a user-defined conversion, see if we have a call to 1525 // a function that itself returns a temporary object. 1526 if (Cast->getCastKind() == CastExpr::CK_UserDefinedConversion) 1527 if (const CallExpr *CE = dyn_cast<CallExpr>(Sub)) 1528 if (CE->getCallReturnType()->isRecordType()) 1529 return CE; 1530 1531 return 0; 1532 } 1533 1534 // A call returning a class type returns a temporary. 1535 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1536 if (CE->getCallReturnType()->isRecordType()) 1537 return CE; 1538 1539 return 0; 1540 } 1541 1542 // Explicit temporary object constructors create temporaries. 1543 return dyn_cast<CXXTemporaryObjectExpr>(E); 1544} 1545 1546/// hasAnyTypeDependentArguments - Determines if any of the expressions 1547/// in Exprs is type-dependent. 1548bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1549 for (unsigned I = 0; I < NumExprs; ++I) 1550 if (Exprs[I]->isTypeDependent()) 1551 return true; 1552 1553 return false; 1554} 1555 1556/// hasAnyValueDependentArguments - Determines if any of the expressions 1557/// in Exprs is value-dependent. 1558bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1559 for (unsigned I = 0; I < NumExprs; ++I) 1560 if (Exprs[I]->isValueDependent()) 1561 return true; 1562 1563 return false; 1564} 1565 1566bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1567 // This function is attempting whether an expression is an initializer 1568 // which can be evaluated at compile-time. isEvaluatable handles most 1569 // of the cases, but it can't deal with some initializer-specific 1570 // expressions, and it can't deal with aggregates; we deal with those here, 1571 // and fall back to isEvaluatable for the other cases. 1572 1573 // FIXME: This function assumes the variable being assigned to 1574 // isn't a reference type! 1575 1576 switch (getStmtClass()) { 1577 default: break; 1578 case StringLiteralClass: 1579 case ObjCStringLiteralClass: 1580 case ObjCEncodeExprClass: 1581 return true; 1582 case CompoundLiteralExprClass: { 1583 // This handles gcc's extension that allows global initializers like 1584 // "struct x {int x;} x = (struct x) {};". 1585 // FIXME: This accepts other cases it shouldn't! 1586 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1587 return Exp->isConstantInitializer(Ctx); 1588 } 1589 case InitListExprClass: { 1590 // FIXME: This doesn't deal with fields with reference types correctly. 1591 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1592 // to bitfields. 1593 const InitListExpr *Exp = cast<InitListExpr>(this); 1594 unsigned numInits = Exp->getNumInits(); 1595 for (unsigned i = 0; i < numInits; i++) { 1596 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1597 return false; 1598 } 1599 return true; 1600 } 1601 case ImplicitValueInitExprClass: 1602 return true; 1603 case ParenExprClass: 1604 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1605 case UnaryOperatorClass: { 1606 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1607 if (Exp->getOpcode() == UnaryOperator::Extension) 1608 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1609 break; 1610 } 1611 case BinaryOperatorClass: { 1612 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1613 // but this handles the common case. 1614 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1615 if (Exp->getOpcode() == BinaryOperator::Sub && 1616 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1617 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1618 return true; 1619 break; 1620 } 1621 case ImplicitCastExprClass: 1622 case CStyleCastExprClass: 1623 // Handle casts with a destination that's a struct or union; this 1624 // deals with both the gcc no-op struct cast extension and the 1625 // cast-to-union extension. 1626 if (getType()->isRecordType()) 1627 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1628 1629 // Integer->integer casts can be handled here, which is important for 1630 // things like (int)(&&x-&&y). Scary but true. 1631 if (getType()->isIntegerType() && 1632 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1633 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1634 1635 break; 1636 } 1637 return isEvaluatable(Ctx); 1638} 1639 1640/// isIntegerConstantExpr - this recursive routine will test if an expression is 1641/// an integer constant expression. 1642 1643/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1644/// comma, etc 1645/// 1646/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1647/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1648/// cast+dereference. 1649 1650// CheckICE - This function does the fundamental ICE checking: the returned 1651// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1652// Note that to reduce code duplication, this helper does no evaluation 1653// itself; the caller checks whether the expression is evaluatable, and 1654// in the rare cases where CheckICE actually cares about the evaluated 1655// value, it calls into Evalute. 1656// 1657// Meanings of Val: 1658// 0: This expression is an ICE if it can be evaluated by Evaluate. 1659// 1: This expression is not an ICE, but if it isn't evaluated, it's 1660// a legal subexpression for an ICE. This return value is used to handle 1661// the comma operator in C99 mode. 1662// 2: This expression is not an ICE, and is not a legal subexpression for one. 1663 1664struct ICEDiag { 1665 unsigned Val; 1666 SourceLocation Loc; 1667 1668 public: 1669 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1670 ICEDiag() : Val(0) {} 1671}; 1672 1673ICEDiag NoDiag() { return ICEDiag(); } 1674 1675static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1676 Expr::EvalResult EVResult; 1677 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1678 !EVResult.Val.isInt()) { 1679 return ICEDiag(2, E->getLocStart()); 1680 } 1681 return NoDiag(); 1682} 1683 1684static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1685 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1686 if (!E->getType()->isIntegralType()) { 1687 return ICEDiag(2, E->getLocStart()); 1688 } 1689 1690 switch (E->getStmtClass()) { 1691#define STMT(Node, Base) case Expr::Node##Class: 1692#define EXPR(Node, Base) 1693#include "clang/AST/StmtNodes.def" 1694 case Expr::PredefinedExprClass: 1695 case Expr::FloatingLiteralClass: 1696 case Expr::ImaginaryLiteralClass: 1697 case Expr::StringLiteralClass: 1698 case Expr::ArraySubscriptExprClass: 1699 case Expr::MemberExprClass: 1700 case Expr::CompoundAssignOperatorClass: 1701 case Expr::CompoundLiteralExprClass: 1702 case Expr::ExtVectorElementExprClass: 1703 case Expr::InitListExprClass: 1704 case Expr::DesignatedInitExprClass: 1705 case Expr::ImplicitValueInitExprClass: 1706 case Expr::ParenListExprClass: 1707 case Expr::VAArgExprClass: 1708 case Expr::AddrLabelExprClass: 1709 case Expr::StmtExprClass: 1710 case Expr::CXXMemberCallExprClass: 1711 case Expr::CXXDynamicCastExprClass: 1712 case Expr::CXXTypeidExprClass: 1713 case Expr::CXXNullPtrLiteralExprClass: 1714 case Expr::CXXThisExprClass: 1715 case Expr::CXXThrowExprClass: 1716 case Expr::CXXNewExprClass: 1717 case Expr::CXXDeleteExprClass: 1718 case Expr::CXXPseudoDestructorExprClass: 1719 case Expr::UnresolvedLookupExprClass: 1720 case Expr::DependentScopeDeclRefExprClass: 1721 case Expr::CXXConstructExprClass: 1722 case Expr::CXXBindTemporaryExprClass: 1723 case Expr::CXXBindReferenceExprClass: 1724 case Expr::CXXExprWithTemporariesClass: 1725 case Expr::CXXTemporaryObjectExprClass: 1726 case Expr::CXXUnresolvedConstructExprClass: 1727 case Expr::CXXDependentScopeMemberExprClass: 1728 case Expr::UnresolvedMemberExprClass: 1729 case Expr::ObjCStringLiteralClass: 1730 case Expr::ObjCEncodeExprClass: 1731 case Expr::ObjCMessageExprClass: 1732 case Expr::ObjCSelectorExprClass: 1733 case Expr::ObjCProtocolExprClass: 1734 case Expr::ObjCIvarRefExprClass: 1735 case Expr::ObjCPropertyRefExprClass: 1736 case Expr::ObjCImplicitSetterGetterRefExprClass: 1737 case Expr::ObjCSuperExprClass: 1738 case Expr::ObjCIsaExprClass: 1739 case Expr::ShuffleVectorExprClass: 1740 case Expr::BlockExprClass: 1741 case Expr::BlockDeclRefExprClass: 1742 case Expr::NoStmtClass: 1743 return ICEDiag(2, E->getLocStart()); 1744 1745 case Expr::GNUNullExprClass: 1746 // GCC considers the GNU __null value to be an integral constant expression. 1747 return NoDiag(); 1748 1749 case Expr::ParenExprClass: 1750 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1751 case Expr::IntegerLiteralClass: 1752 case Expr::CharacterLiteralClass: 1753 case Expr::CXXBoolLiteralExprClass: 1754 case Expr::CXXZeroInitValueExprClass: 1755 case Expr::TypesCompatibleExprClass: 1756 case Expr::UnaryTypeTraitExprClass: 1757 return NoDiag(); 1758 case Expr::CallExprClass: 1759 case Expr::CXXOperatorCallExprClass: { 1760 const CallExpr *CE = cast<CallExpr>(E); 1761 if (CE->isBuiltinCall(Ctx)) 1762 return CheckEvalInICE(E, Ctx); 1763 return ICEDiag(2, E->getLocStart()); 1764 } 1765 case Expr::DeclRefExprClass: 1766 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1767 return NoDiag(); 1768 if (Ctx.getLangOptions().CPlusPlus && 1769 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1770 const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 1771 1772 // Parameter variables are never constants. Without this check, 1773 // getAnyInitializer() can find a default argument, which leads 1774 // to chaos. 1775 if (isa<ParmVarDecl>(D)) 1776 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1777 1778 // C++ 7.1.5.1p2 1779 // A variable of non-volatile const-qualified integral or enumeration 1780 // type initialized by an ICE can be used in ICEs. 1781 if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 1782 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1783 if (Quals.hasVolatile() || !Quals.hasConst()) 1784 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1785 1786 // Look for a declaration of this variable that has an initializer. 1787 const VarDecl *ID = 0; 1788 const Expr *Init = Dcl->getAnyInitializer(ID); 1789 if (Init) { 1790 if (ID->isInitKnownICE()) { 1791 // We have already checked whether this subexpression is an 1792 // integral constant expression. 1793 if (ID->isInitICE()) 1794 return NoDiag(); 1795 else 1796 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1797 } 1798 1799 // It's an ICE whether or not the definition we found is 1800 // out-of-line. See DR 721 and the discussion in Clang PR 1801 // 6206 for details. 1802 1803 if (Dcl->isCheckingICE()) { 1804 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1805 } 1806 1807 Dcl->setCheckingICE(); 1808 ICEDiag Result = CheckICE(Init, Ctx); 1809 // Cache the result of the ICE test. 1810 Dcl->setInitKnownICE(Result.Val == 0); 1811 return Result; 1812 } 1813 } 1814 } 1815 return ICEDiag(2, E->getLocStart()); 1816 case Expr::UnaryOperatorClass: { 1817 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1818 switch (Exp->getOpcode()) { 1819 case UnaryOperator::PostInc: 1820 case UnaryOperator::PostDec: 1821 case UnaryOperator::PreInc: 1822 case UnaryOperator::PreDec: 1823 case UnaryOperator::AddrOf: 1824 case UnaryOperator::Deref: 1825 return ICEDiag(2, E->getLocStart()); 1826 1827 case UnaryOperator::Extension: 1828 case UnaryOperator::LNot: 1829 case UnaryOperator::Plus: 1830 case UnaryOperator::Minus: 1831 case UnaryOperator::Not: 1832 case UnaryOperator::Real: 1833 case UnaryOperator::Imag: 1834 return CheckICE(Exp->getSubExpr(), Ctx); 1835 case UnaryOperator::OffsetOf: 1836 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1837 // Evaluate matches the proposed gcc behavior for cases like 1838 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1839 // compliance: we should warn earlier for offsetof expressions with 1840 // array subscripts that aren't ICEs, and if the array subscripts 1841 // are ICEs, the value of the offsetof must be an integer constant. 1842 return CheckEvalInICE(E, Ctx); 1843 } 1844 } 1845 case Expr::SizeOfAlignOfExprClass: { 1846 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1847 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1848 return ICEDiag(2, E->getLocStart()); 1849 return NoDiag(); 1850 } 1851 case Expr::BinaryOperatorClass: { 1852 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1853 switch (Exp->getOpcode()) { 1854 case BinaryOperator::PtrMemD: 1855 case BinaryOperator::PtrMemI: 1856 case BinaryOperator::Assign: 1857 case BinaryOperator::MulAssign: 1858 case BinaryOperator::DivAssign: 1859 case BinaryOperator::RemAssign: 1860 case BinaryOperator::AddAssign: 1861 case BinaryOperator::SubAssign: 1862 case BinaryOperator::ShlAssign: 1863 case BinaryOperator::ShrAssign: 1864 case BinaryOperator::AndAssign: 1865 case BinaryOperator::XorAssign: 1866 case BinaryOperator::OrAssign: 1867 return ICEDiag(2, E->getLocStart()); 1868 1869 case BinaryOperator::Mul: 1870 case BinaryOperator::Div: 1871 case BinaryOperator::Rem: 1872 case BinaryOperator::Add: 1873 case BinaryOperator::Sub: 1874 case BinaryOperator::Shl: 1875 case BinaryOperator::Shr: 1876 case BinaryOperator::LT: 1877 case BinaryOperator::GT: 1878 case BinaryOperator::LE: 1879 case BinaryOperator::GE: 1880 case BinaryOperator::EQ: 1881 case BinaryOperator::NE: 1882 case BinaryOperator::And: 1883 case BinaryOperator::Xor: 1884 case BinaryOperator::Or: 1885 case BinaryOperator::Comma: { 1886 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1887 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1888 if (Exp->getOpcode() == BinaryOperator::Div || 1889 Exp->getOpcode() == BinaryOperator::Rem) { 1890 // Evaluate gives an error for undefined Div/Rem, so make sure 1891 // we don't evaluate one. 1892 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1893 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1894 if (REval == 0) 1895 return ICEDiag(1, E->getLocStart()); 1896 if (REval.isSigned() && REval.isAllOnesValue()) { 1897 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1898 if (LEval.isMinSignedValue()) 1899 return ICEDiag(1, E->getLocStart()); 1900 } 1901 } 1902 } 1903 if (Exp->getOpcode() == BinaryOperator::Comma) { 1904 if (Ctx.getLangOptions().C99) { 1905 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1906 // if it isn't evaluated. 1907 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1908 return ICEDiag(1, E->getLocStart()); 1909 } else { 1910 // In both C89 and C++, commas in ICEs are illegal. 1911 return ICEDiag(2, E->getLocStart()); 1912 } 1913 } 1914 if (LHSResult.Val >= RHSResult.Val) 1915 return LHSResult; 1916 return RHSResult; 1917 } 1918 case BinaryOperator::LAnd: 1919 case BinaryOperator::LOr: { 1920 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1921 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1922 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1923 // Rare case where the RHS has a comma "side-effect"; we need 1924 // to actually check the condition to see whether the side 1925 // with the comma is evaluated. 1926 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1927 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1928 return RHSResult; 1929 return NoDiag(); 1930 } 1931 1932 if (LHSResult.Val >= RHSResult.Val) 1933 return LHSResult; 1934 return RHSResult; 1935 } 1936 } 1937 } 1938 case Expr::ImplicitCastExprClass: 1939 case Expr::CStyleCastExprClass: 1940 case Expr::CXXFunctionalCastExprClass: 1941 case Expr::CXXNamedCastExprClass: 1942 case Expr::CXXStaticCastExprClass: 1943 case Expr::CXXReinterpretCastExprClass: 1944 case Expr::CXXConstCastExprClass: { 1945 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1946 if (SubExpr->getType()->isIntegralType()) 1947 return CheckICE(SubExpr, Ctx); 1948 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1949 return NoDiag(); 1950 return ICEDiag(2, E->getLocStart()); 1951 } 1952 case Expr::ConditionalOperatorClass: { 1953 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1954 // If the condition (ignoring parens) is a __builtin_constant_p call, 1955 // then only the true side is actually considered in an integer constant 1956 // expression, and it is fully evaluated. This is an important GNU 1957 // extension. See GCC PR38377 for discussion. 1958 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1959 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1960 Expr::EvalResult EVResult; 1961 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1962 !EVResult.Val.isInt()) { 1963 return ICEDiag(2, E->getLocStart()); 1964 } 1965 return NoDiag(); 1966 } 1967 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1968 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1969 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1970 if (CondResult.Val == 2) 1971 return CondResult; 1972 if (TrueResult.Val == 2) 1973 return TrueResult; 1974 if (FalseResult.Val == 2) 1975 return FalseResult; 1976 if (CondResult.Val == 1) 1977 return CondResult; 1978 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1979 return NoDiag(); 1980 // Rare case where the diagnostics depend on which side is evaluated 1981 // Note that if we get here, CondResult is 0, and at least one of 1982 // TrueResult and FalseResult is non-zero. 1983 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1984 return FalseResult; 1985 } 1986 return TrueResult; 1987 } 1988 case Expr::CXXDefaultArgExprClass: 1989 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1990 case Expr::ChooseExprClass: { 1991 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1992 } 1993 } 1994 1995 // Silence a GCC warning 1996 return ICEDiag(2, E->getLocStart()); 1997} 1998 1999bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 2000 SourceLocation *Loc, bool isEvaluated) const { 2001 ICEDiag d = CheckICE(this, Ctx); 2002 if (d.Val != 0) { 2003 if (Loc) *Loc = d.Loc; 2004 return false; 2005 } 2006 EvalResult EvalResult; 2007 if (!Evaluate(EvalResult, Ctx)) 2008 llvm_unreachable("ICE cannot be evaluated!"); 2009 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 2010 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 2011 Result = EvalResult.Val.getInt(); 2012 return true; 2013} 2014 2015/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2016/// integer constant expression with the value zero, or if this is one that is 2017/// cast to void*. 2018bool Expr::isNullPointerConstant(ASTContext &Ctx, 2019 NullPointerConstantValueDependence NPC) const { 2020 if (isValueDependent()) { 2021 switch (NPC) { 2022 case NPC_NeverValueDependent: 2023 assert(false && "Unexpected value dependent expression!"); 2024 // If the unthinkable happens, fall through to the safest alternative. 2025 2026 case NPC_ValueDependentIsNull: 2027 return isTypeDependent() || getType()->isIntegralType(); 2028 2029 case NPC_ValueDependentIsNotNull: 2030 return false; 2031 } 2032 } 2033 2034 // Strip off a cast to void*, if it exists. Except in C++. 2035 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2036 if (!Ctx.getLangOptions().CPlusPlus) { 2037 // Check that it is a cast to void*. 2038 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2039 QualType Pointee = PT->getPointeeType(); 2040 if (!Pointee.hasQualifiers() && 2041 Pointee->isVoidType() && // to void* 2042 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2043 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2044 } 2045 } 2046 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2047 // Ignore the ImplicitCastExpr type entirely. 2048 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2049 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2050 // Accept ((void*)0) as a null pointer constant, as many other 2051 // implementations do. 2052 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2053 } else if (const CXXDefaultArgExpr *DefaultArg 2054 = dyn_cast<CXXDefaultArgExpr>(this)) { 2055 // See through default argument expressions 2056 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2057 } else if (isa<GNUNullExpr>(this)) { 2058 // The GNU __null extension is always a null pointer constant. 2059 return true; 2060 } 2061 2062 // C++0x nullptr_t is always a null pointer constant. 2063 if (getType()->isNullPtrType()) 2064 return true; 2065 2066 // This expression must be an integer type. 2067 if (!getType()->isIntegerType() || 2068 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2069 return false; 2070 2071 // If we have an integer constant expression, we need to *evaluate* it and 2072 // test for the value 0. 2073 llvm::APSInt Result; 2074 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2075} 2076 2077FieldDecl *Expr::getBitField() { 2078 Expr *E = this->IgnoreParens(); 2079 2080 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2081 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2082 E = ICE->getSubExpr()->IgnoreParens(); 2083 else 2084 break; 2085 } 2086 2087 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2088 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2089 if (Field->isBitField()) 2090 return Field; 2091 2092 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2093 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2094 return BinOp->getLHS()->getBitField(); 2095 2096 return 0; 2097} 2098 2099bool Expr::refersToVectorElement() const { 2100 const Expr *E = this->IgnoreParens(); 2101 2102 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2103 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2104 E = ICE->getSubExpr()->IgnoreParens(); 2105 else 2106 break; 2107 } 2108 2109 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2110 return ASE->getBase()->getType()->isVectorType(); 2111 2112 if (isa<ExtVectorElementExpr>(E)) 2113 return true; 2114 2115 return false; 2116} 2117 2118/// isArrow - Return true if the base expression is a pointer to vector, 2119/// return false if the base expression is a vector. 2120bool ExtVectorElementExpr::isArrow() const { 2121 return getBase()->getType()->isPointerType(); 2122} 2123 2124unsigned ExtVectorElementExpr::getNumElements() const { 2125 if (const VectorType *VT = getType()->getAs<VectorType>()) 2126 return VT->getNumElements(); 2127 return 1; 2128} 2129 2130/// containsDuplicateElements - Return true if any element access is repeated. 2131bool ExtVectorElementExpr::containsDuplicateElements() const { 2132 // FIXME: Refactor this code to an accessor on the AST node which returns the 2133 // "type" of component access, and share with code below and in Sema. 2134 llvm::StringRef Comp = Accessor->getName(); 2135 2136 // Halving swizzles do not contain duplicate elements. 2137 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2138 return false; 2139 2140 // Advance past s-char prefix on hex swizzles. 2141 if (Comp[0] == 's' || Comp[0] == 'S') 2142 Comp = Comp.substr(1); 2143 2144 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2145 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2146 return true; 2147 2148 return false; 2149} 2150 2151/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2152void ExtVectorElementExpr::getEncodedElementAccess( 2153 llvm::SmallVectorImpl<unsigned> &Elts) const { 2154 llvm::StringRef Comp = Accessor->getName(); 2155 if (Comp[0] == 's' || Comp[0] == 'S') 2156 Comp = Comp.substr(1); 2157 2158 bool isHi = Comp == "hi"; 2159 bool isLo = Comp == "lo"; 2160 bool isEven = Comp == "even"; 2161 bool isOdd = Comp == "odd"; 2162 2163 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2164 uint64_t Index; 2165 2166 if (isHi) 2167 Index = e + i; 2168 else if (isLo) 2169 Index = i; 2170 else if (isEven) 2171 Index = 2 * i; 2172 else if (isOdd) 2173 Index = 2 * i + 1; 2174 else 2175 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2176 2177 Elts.push_back(Index); 2178 } 2179} 2180 2181// constructor for instance messages. 2182ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, Expr *receiver, 2183 Selector selInfo, 2184 QualType retType, ObjCMethodDecl *mproto, 2185 SourceLocation LBrac, SourceLocation RBrac, 2186 Expr **ArgExprs, unsigned nargs) 2187 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2188 MethodProto(mproto) { 2189 NumArgs = nargs; 2190 SubExprs = new (C) Stmt*[NumArgs+1]; 2191 SubExprs[RECEIVER] = receiver; 2192 if (NumArgs) { 2193 for (unsigned i = 0; i != NumArgs; ++i) 2194 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2195 } 2196 LBracloc = LBrac; 2197 RBracloc = RBrac; 2198} 2199 2200// constructor for class messages. 2201// FIXME: clsName should be typed to ObjCInterfaceType 2202ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, IdentifierInfo *clsName, 2203 SourceLocation clsNameLoc, Selector selInfo, 2204 QualType retType, ObjCMethodDecl *mproto, 2205 SourceLocation LBrac, SourceLocation RBrac, 2206 Expr **ArgExprs, unsigned nargs) 2207 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc), 2208 SelName(selInfo), MethodProto(mproto) { 2209 NumArgs = nargs; 2210 SubExprs = new (C) Stmt*[NumArgs+1]; 2211 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2212 if (NumArgs) { 2213 for (unsigned i = 0; i != NumArgs; ++i) 2214 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2215 } 2216 LBracloc = LBrac; 2217 RBracloc = RBrac; 2218} 2219 2220// constructor for class messages. 2221ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, ObjCInterfaceDecl *cls, 2222 SourceLocation clsNameLoc, Selector selInfo, 2223 QualType retType, 2224 ObjCMethodDecl *mproto, SourceLocation LBrac, 2225 SourceLocation RBrac, Expr **ArgExprs, 2226 unsigned nargs) 2227 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc), 2228 SelName(selInfo), MethodProto(mproto) 2229{ 2230 NumArgs = nargs; 2231 SubExprs = new (C) Stmt*[NumArgs+1]; 2232 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2233 if (NumArgs) { 2234 for (unsigned i = 0; i != NumArgs; ++i) 2235 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2236 } 2237 LBracloc = LBrac; 2238 RBracloc = RBrac; 2239} 2240 2241ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2242 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2243 switch (x & Flags) { 2244 default: 2245 assert(false && "Invalid ObjCMessageExpr."); 2246 case IsInstMeth: 2247 return ClassInfo(0, 0, SourceLocation()); 2248 case IsClsMethDeclUnknown: 2249 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags), ClassNameLoc); 2250 case IsClsMethDeclKnown: { 2251 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2252 return ClassInfo(D, D->getIdentifier(), ClassNameLoc); 2253 } 2254 } 2255} 2256 2257void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2258 if (CI.Decl == 0 && CI.Name == 0) { 2259 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2260 return; 2261 } 2262 2263 if (CI.Decl == 0) 2264 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Name | IsClsMethDeclUnknown); 2265 else 2266 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Decl | IsClsMethDeclKnown); 2267 ClassNameLoc = CI.Loc; 2268} 2269 2270void ObjCMessageExpr::DoDestroy(ASTContext &C) { 2271 DestroyChildren(C); 2272 if (SubExprs) 2273 C.Deallocate(SubExprs); 2274 this->~ObjCMessageExpr(); 2275 C.Deallocate((void*) this); 2276} 2277 2278bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2279 return getCond()->EvaluateAsInt(C) != 0; 2280} 2281 2282void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2283 unsigned NumExprs) { 2284 if (SubExprs) C.Deallocate(SubExprs); 2285 2286 SubExprs = new (C) Stmt* [NumExprs]; 2287 this->NumExprs = NumExprs; 2288 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2289} 2290 2291void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2292 DestroyChildren(C); 2293 if (SubExprs) C.Deallocate(SubExprs); 2294 this->~ShuffleVectorExpr(); 2295 C.Deallocate(this); 2296} 2297 2298void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2299 // Override default behavior of traversing children. If this has a type 2300 // operand and the type is a variable-length array, the child iteration 2301 // will iterate over the size expression. However, this expression belongs 2302 // to the type, not to this, so we don't want to delete it. 2303 // We still want to delete this expression. 2304 if (isArgumentType()) { 2305 this->~SizeOfAlignOfExpr(); 2306 C.Deallocate(this); 2307 } 2308 else 2309 Expr::DoDestroy(C); 2310} 2311 2312//===----------------------------------------------------------------------===// 2313// DesignatedInitExpr 2314//===----------------------------------------------------------------------===// 2315 2316IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2317 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2318 if (Field.NameOrField & 0x01) 2319 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2320 else 2321 return getField()->getIdentifier(); 2322} 2323 2324DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2325 unsigned NumDesignators, 2326 const Designator *Designators, 2327 SourceLocation EqualOrColonLoc, 2328 bool GNUSyntax, 2329 Expr **IndexExprs, 2330 unsigned NumIndexExprs, 2331 Expr *Init) 2332 : Expr(DesignatedInitExprClass, Ty, 2333 Init->isTypeDependent(), Init->isValueDependent()), 2334 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2335 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2336 this->Designators = new (C) Designator[NumDesignators]; 2337 2338 // Record the initializer itself. 2339 child_iterator Child = child_begin(); 2340 *Child++ = Init; 2341 2342 // Copy the designators and their subexpressions, computing 2343 // value-dependence along the way. 2344 unsigned IndexIdx = 0; 2345 for (unsigned I = 0; I != NumDesignators; ++I) { 2346 this->Designators[I] = Designators[I]; 2347 2348 if (this->Designators[I].isArrayDesignator()) { 2349 // Compute type- and value-dependence. 2350 Expr *Index = IndexExprs[IndexIdx]; 2351 ValueDependent = ValueDependent || 2352 Index->isTypeDependent() || Index->isValueDependent(); 2353 2354 // Copy the index expressions into permanent storage. 2355 *Child++ = IndexExprs[IndexIdx++]; 2356 } else if (this->Designators[I].isArrayRangeDesignator()) { 2357 // Compute type- and value-dependence. 2358 Expr *Start = IndexExprs[IndexIdx]; 2359 Expr *End = IndexExprs[IndexIdx + 1]; 2360 ValueDependent = ValueDependent || 2361 Start->isTypeDependent() || Start->isValueDependent() || 2362 End->isTypeDependent() || End->isValueDependent(); 2363 2364 // Copy the start/end expressions into permanent storage. 2365 *Child++ = IndexExprs[IndexIdx++]; 2366 *Child++ = IndexExprs[IndexIdx++]; 2367 } 2368 } 2369 2370 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2371} 2372 2373DesignatedInitExpr * 2374DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2375 unsigned NumDesignators, 2376 Expr **IndexExprs, unsigned NumIndexExprs, 2377 SourceLocation ColonOrEqualLoc, 2378 bool UsesColonSyntax, Expr *Init) { 2379 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2380 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2381 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2382 ColonOrEqualLoc, UsesColonSyntax, 2383 IndexExprs, NumIndexExprs, Init); 2384} 2385 2386DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2387 unsigned NumIndexExprs) { 2388 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2389 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2390 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2391} 2392 2393void DesignatedInitExpr::setDesignators(ASTContext &C, 2394 const Designator *Desigs, 2395 unsigned NumDesigs) { 2396 DestroyDesignators(C); 2397 2398 Designators = new (C) Designator[NumDesigs]; 2399 NumDesignators = NumDesigs; 2400 for (unsigned I = 0; I != NumDesigs; ++I) 2401 Designators[I] = Desigs[I]; 2402} 2403 2404SourceRange DesignatedInitExpr::getSourceRange() const { 2405 SourceLocation StartLoc; 2406 Designator &First = 2407 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2408 if (First.isFieldDesignator()) { 2409 if (GNUSyntax) 2410 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2411 else 2412 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2413 } else 2414 StartLoc = 2415 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2416 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2417} 2418 2419Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2420 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2421 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2422 Ptr += sizeof(DesignatedInitExpr); 2423 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2424 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2425} 2426 2427Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2428 assert(D.Kind == Designator::ArrayRangeDesignator && 2429 "Requires array range designator"); 2430 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2431 Ptr += sizeof(DesignatedInitExpr); 2432 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2433 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2434} 2435 2436Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2437 assert(D.Kind == Designator::ArrayRangeDesignator && 2438 "Requires array range designator"); 2439 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2440 Ptr += sizeof(DesignatedInitExpr); 2441 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2442 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2443} 2444 2445/// \brief Replaces the designator at index @p Idx with the series 2446/// of designators in [First, Last). 2447void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2448 const Designator *First, 2449 const Designator *Last) { 2450 unsigned NumNewDesignators = Last - First; 2451 if (NumNewDesignators == 0) { 2452 std::copy_backward(Designators + Idx + 1, 2453 Designators + NumDesignators, 2454 Designators + Idx); 2455 --NumNewDesignators; 2456 return; 2457 } else if (NumNewDesignators == 1) { 2458 Designators[Idx] = *First; 2459 return; 2460 } 2461 2462 Designator *NewDesignators 2463 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2464 std::copy(Designators, Designators + Idx, NewDesignators); 2465 std::copy(First, Last, NewDesignators + Idx); 2466 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2467 NewDesignators + Idx + NumNewDesignators); 2468 DestroyDesignators(C); 2469 Designators = NewDesignators; 2470 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2471} 2472 2473void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2474 DestroyDesignators(C); 2475 Expr::DoDestroy(C); 2476} 2477 2478void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2479 for (unsigned I = 0; I != NumDesignators; ++I) 2480 Designators[I].~Designator(); 2481 C.Deallocate(Designators); 2482 Designators = 0; 2483} 2484 2485ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2486 Expr **exprs, unsigned nexprs, 2487 SourceLocation rparenloc) 2488: Expr(ParenListExprClass, QualType(), 2489 hasAnyTypeDependentArguments(exprs, nexprs), 2490 hasAnyValueDependentArguments(exprs, nexprs)), 2491 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2492 2493 Exprs = new (C) Stmt*[nexprs]; 2494 for (unsigned i = 0; i != nexprs; ++i) 2495 Exprs[i] = exprs[i]; 2496} 2497 2498void ParenListExpr::DoDestroy(ASTContext& C) { 2499 DestroyChildren(C); 2500 if (Exprs) C.Deallocate(Exprs); 2501 this->~ParenListExpr(); 2502 C.Deallocate(this); 2503} 2504 2505//===----------------------------------------------------------------------===// 2506// ExprIterator. 2507//===----------------------------------------------------------------------===// 2508 2509Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2510Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2511Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2512const Expr* ConstExprIterator::operator[](size_t idx) const { 2513 return cast<Expr>(I[idx]); 2514} 2515const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2516const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2517 2518//===----------------------------------------------------------------------===// 2519// Child Iterators for iterating over subexpressions/substatements 2520//===----------------------------------------------------------------------===// 2521 2522// DeclRefExpr 2523Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2524Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2525 2526// ObjCIvarRefExpr 2527Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2528Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2529 2530// ObjCPropertyRefExpr 2531Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2532Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2533 2534// ObjCImplicitSetterGetterRefExpr 2535Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2536 return &Base; 2537} 2538Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2539 return &Base+1; 2540} 2541 2542// ObjCSuperExpr 2543Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2544Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2545 2546// ObjCIsaExpr 2547Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2548Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2549 2550// PredefinedExpr 2551Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2552Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2553 2554// IntegerLiteral 2555Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2556Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2557 2558// CharacterLiteral 2559Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2560Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2561 2562// FloatingLiteral 2563Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2564Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2565 2566// ImaginaryLiteral 2567Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2568Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2569 2570// StringLiteral 2571Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2572Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2573 2574// ParenExpr 2575Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2576Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2577 2578// UnaryOperator 2579Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2580Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2581 2582// SizeOfAlignOfExpr 2583Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2584 // If this is of a type and the type is a VLA type (and not a typedef), the 2585 // size expression of the VLA needs to be treated as an executable expression. 2586 // Why isn't this weirdness documented better in StmtIterator? 2587 if (isArgumentType()) { 2588 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2589 getArgumentType().getTypePtr())) 2590 return child_iterator(T); 2591 return child_iterator(); 2592 } 2593 return child_iterator(&Argument.Ex); 2594} 2595Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2596 if (isArgumentType()) 2597 return child_iterator(); 2598 return child_iterator(&Argument.Ex + 1); 2599} 2600 2601// ArraySubscriptExpr 2602Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2603 return &SubExprs[0]; 2604} 2605Stmt::child_iterator ArraySubscriptExpr::child_end() { 2606 return &SubExprs[0]+END_EXPR; 2607} 2608 2609// CallExpr 2610Stmt::child_iterator CallExpr::child_begin() { 2611 return &SubExprs[0]; 2612} 2613Stmt::child_iterator CallExpr::child_end() { 2614 return &SubExprs[0]+NumArgs+ARGS_START; 2615} 2616 2617// MemberExpr 2618Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2619Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2620 2621// ExtVectorElementExpr 2622Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2623Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2624 2625// CompoundLiteralExpr 2626Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2627Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2628 2629// CastExpr 2630Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2631Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2632 2633// BinaryOperator 2634Stmt::child_iterator BinaryOperator::child_begin() { 2635 return &SubExprs[0]; 2636} 2637Stmt::child_iterator BinaryOperator::child_end() { 2638 return &SubExprs[0]+END_EXPR; 2639} 2640 2641// ConditionalOperator 2642Stmt::child_iterator ConditionalOperator::child_begin() { 2643 return &SubExprs[0]; 2644} 2645Stmt::child_iterator ConditionalOperator::child_end() { 2646 return &SubExprs[0]+END_EXPR; 2647} 2648 2649// AddrLabelExpr 2650Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2651Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2652 2653// StmtExpr 2654Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2655Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2656 2657// TypesCompatibleExpr 2658Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2659 return child_iterator(); 2660} 2661 2662Stmt::child_iterator TypesCompatibleExpr::child_end() { 2663 return child_iterator(); 2664} 2665 2666// ChooseExpr 2667Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2668Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2669 2670// GNUNullExpr 2671Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2672Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2673 2674// ShuffleVectorExpr 2675Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2676 return &SubExprs[0]; 2677} 2678Stmt::child_iterator ShuffleVectorExpr::child_end() { 2679 return &SubExprs[0]+NumExprs; 2680} 2681 2682// VAArgExpr 2683Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2684Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2685 2686// InitListExpr 2687Stmt::child_iterator InitListExpr::child_begin() { 2688 return InitExprs.size() ? &InitExprs[0] : 0; 2689} 2690Stmt::child_iterator InitListExpr::child_end() { 2691 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2692} 2693 2694// DesignatedInitExpr 2695Stmt::child_iterator DesignatedInitExpr::child_begin() { 2696 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2697 Ptr += sizeof(DesignatedInitExpr); 2698 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2699} 2700Stmt::child_iterator DesignatedInitExpr::child_end() { 2701 return child_iterator(&*child_begin() + NumSubExprs); 2702} 2703 2704// ImplicitValueInitExpr 2705Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2706 return child_iterator(); 2707} 2708 2709Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2710 return child_iterator(); 2711} 2712 2713// ParenListExpr 2714Stmt::child_iterator ParenListExpr::child_begin() { 2715 return &Exprs[0]; 2716} 2717Stmt::child_iterator ParenListExpr::child_end() { 2718 return &Exprs[0]+NumExprs; 2719} 2720 2721// ObjCStringLiteral 2722Stmt::child_iterator ObjCStringLiteral::child_begin() { 2723 return &String; 2724} 2725Stmt::child_iterator ObjCStringLiteral::child_end() { 2726 return &String+1; 2727} 2728 2729// ObjCEncodeExpr 2730Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2731Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2732 2733// ObjCSelectorExpr 2734Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2735 return child_iterator(); 2736} 2737Stmt::child_iterator ObjCSelectorExpr::child_end() { 2738 return child_iterator(); 2739} 2740 2741// ObjCProtocolExpr 2742Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2743 return child_iterator(); 2744} 2745Stmt::child_iterator ObjCProtocolExpr::child_end() { 2746 return child_iterator(); 2747} 2748 2749// ObjCMessageExpr 2750Stmt::child_iterator ObjCMessageExpr::child_begin() { 2751 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2752} 2753Stmt::child_iterator ObjCMessageExpr::child_end() { 2754 return &SubExprs[0]+ARGS_START+getNumArgs(); 2755} 2756 2757// Blocks 2758Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2759Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2760 2761Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2762Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2763