Expr.cpp revision 900fc6388e803868a34b9483510c345e9b49d7eb
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/// isKnownToHaveBooleanValue - Return true if this is an integer expression 31/// that is known to return 0 or 1. This happens for _Bool/bool expressions 32/// but also int expressions which are produced by things like comparisons in 33/// C. 34bool Expr::isKnownToHaveBooleanValue() const { 35 // If this value has _Bool type, it is obvious 0/1. 36 if (getType()->isBooleanType()) return true; 37 // If this is a non-scalar-integer type, we don't care enough to try. 38 if (!getType()->isIntegralType()) return false; 39 40 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 41 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 42 43 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 44 switch (UO->getOpcode()) { 45 case UnaryOperator::Plus: 46 case UnaryOperator::Extension: 47 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 48 default: 49 return false; 50 } 51 } 52 53 if (const CastExpr *CE = dyn_cast<CastExpr>(this)) 54 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 55 56 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 57 switch (BO->getOpcode()) { 58 default: return false; 59 case BinaryOperator::LT: // Relational operators. 60 case BinaryOperator::GT: 61 case BinaryOperator::LE: 62 case BinaryOperator::GE: 63 case BinaryOperator::EQ: // Equality operators. 64 case BinaryOperator::NE: 65 case BinaryOperator::LAnd: // AND operator. 66 case BinaryOperator::LOr: // Logical OR operator. 67 return true; 68 69 case BinaryOperator::And: // Bitwise AND operator. 70 case BinaryOperator::Xor: // Bitwise XOR operator. 71 case BinaryOperator::Or: // Bitwise OR operator. 72 // Handle things like (x==2)|(y==12). 73 return BO->getLHS()->isKnownToHaveBooleanValue() && 74 BO->getRHS()->isKnownToHaveBooleanValue(); 75 76 case BinaryOperator::Comma: 77 case BinaryOperator::Assign: 78 return BO->getRHS()->isKnownToHaveBooleanValue(); 79 } 80 } 81 82 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 83 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 84 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 85 86 return false; 87} 88 89//===----------------------------------------------------------------------===// 90// Primary Expressions. 91//===----------------------------------------------------------------------===// 92 93void ExplicitTemplateArgumentList::initializeFrom( 94 const TemplateArgumentListInfo &Info) { 95 LAngleLoc = Info.getLAngleLoc(); 96 RAngleLoc = Info.getRAngleLoc(); 97 NumTemplateArgs = Info.size(); 98 99 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 100 for (unsigned i = 0; i != NumTemplateArgs; ++i) 101 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 102} 103 104void ExplicitTemplateArgumentList::copyInto( 105 TemplateArgumentListInfo &Info) const { 106 Info.setLAngleLoc(LAngleLoc); 107 Info.setRAngleLoc(RAngleLoc); 108 for (unsigned I = 0; I != NumTemplateArgs; ++I) 109 Info.addArgument(getTemplateArgs()[I]); 110} 111 112std::size_t ExplicitTemplateArgumentList::sizeFor( 113 const TemplateArgumentListInfo &Info) { 114 return sizeof(ExplicitTemplateArgumentList) + 115 sizeof(TemplateArgumentLoc) * Info.size(); 116} 117 118void DeclRefExpr::computeDependence() { 119 TypeDependent = false; 120 ValueDependent = false; 121 122 NamedDecl *D = getDecl(); 123 124 // (TD) C++ [temp.dep.expr]p3: 125 // An id-expression is type-dependent if it contains: 126 // 127 // and 128 // 129 // (VD) C++ [temp.dep.constexpr]p2: 130 // An identifier is value-dependent if it is: 131 132 // (TD) - an identifier that was declared with dependent type 133 // (VD) - a name declared with a dependent type, 134 if (getType()->isDependentType()) { 135 TypeDependent = true; 136 ValueDependent = true; 137 } 138 // (TD) - a conversion-function-id that specifies a dependent type 139 else if (D->getDeclName().getNameKind() 140 == DeclarationName::CXXConversionFunctionName && 141 D->getDeclName().getCXXNameType()->isDependentType()) { 142 TypeDependent = true; 143 ValueDependent = true; 144 } 145 // (TD) - a template-id that is dependent, 146 else if (hasExplicitTemplateArgumentList() && 147 TemplateSpecializationType::anyDependentTemplateArguments( 148 getTemplateArgs(), 149 getNumTemplateArgs())) { 150 TypeDependent = true; 151 ValueDependent = true; 152 } 153 // (VD) - the name of a non-type template parameter, 154 else if (isa<NonTypeTemplateParmDecl>(D)) 155 ValueDependent = true; 156 // (VD) - a constant with integral or enumeration type and is 157 // initialized with an expression that is value-dependent. 158 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 159 if (Var->getType()->isIntegralType() && 160 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 161 if (const Expr *Init = Var->getAnyInitializer()) 162 if (Init->isValueDependent()) 163 ValueDependent = true; 164 } 165 } 166 // (TD) - a nested-name-specifier or a qualified-id that names a 167 // member of an unknown specialization. 168 // (handled by DependentScopeDeclRefExpr) 169} 170 171DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 172 SourceRange QualifierRange, 173 ValueDecl *D, SourceLocation NameLoc, 174 const TemplateArgumentListInfo *TemplateArgs, 175 QualType T) 176 : Expr(DeclRefExprClass, T, false, false), 177 DecoratedD(D, 178 (Qualifier? HasQualifierFlag : 0) | 179 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 180 Loc(NameLoc) { 181 if (Qualifier) { 182 NameQualifier *NQ = getNameQualifier(); 183 NQ->NNS = Qualifier; 184 NQ->Range = QualifierRange; 185 } 186 187 if (TemplateArgs) 188 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 189 190 computeDependence(); 191} 192 193DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 194 NestedNameSpecifier *Qualifier, 195 SourceRange QualifierRange, 196 ValueDecl *D, 197 SourceLocation NameLoc, 198 QualType T, 199 const TemplateArgumentListInfo *TemplateArgs) { 200 std::size_t Size = sizeof(DeclRefExpr); 201 if (Qualifier != 0) 202 Size += sizeof(NameQualifier); 203 204 if (TemplateArgs) 205 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 206 207 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 208 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 209 TemplateArgs, T); 210} 211 212SourceRange DeclRefExpr::getSourceRange() const { 213 // FIXME: Does not handle multi-token names well, e.g., operator[]. 214 SourceRange R(Loc); 215 216 if (hasQualifier()) 217 R.setBegin(getQualifierRange().getBegin()); 218 if (hasExplicitTemplateArgumentList()) 219 R.setEnd(getRAngleLoc()); 220 return R; 221} 222 223// FIXME: Maybe this should use DeclPrinter with a special "print predefined 224// expr" policy instead. 225std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 226 ASTContext &Context = CurrentDecl->getASTContext(); 227 228 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 229 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 230 return FD->getNameAsString(); 231 232 llvm::SmallString<256> Name; 233 llvm::raw_svector_ostream Out(Name); 234 235 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 236 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 237 Out << "virtual "; 238 if (MD->isStatic()) 239 Out << "static "; 240 } 241 242 PrintingPolicy Policy(Context.getLangOptions()); 243 244 std::string Proto = FD->getQualifiedNameAsString(Policy); 245 246 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 247 const FunctionProtoType *FT = 0; 248 if (FD->hasWrittenPrototype()) 249 FT = dyn_cast<FunctionProtoType>(AFT); 250 251 Proto += "("; 252 if (FT) { 253 llvm::raw_string_ostream POut(Proto); 254 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 255 if (i) POut << ", "; 256 std::string Param; 257 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 258 POut << Param; 259 } 260 261 if (FT->isVariadic()) { 262 if (FD->getNumParams()) POut << ", "; 263 POut << "..."; 264 } 265 } 266 Proto += ")"; 267 268 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 269 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 270 if (ThisQuals.hasConst()) 271 Proto += " const"; 272 if (ThisQuals.hasVolatile()) 273 Proto += " volatile"; 274 } 275 276 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 277 AFT->getResultType().getAsStringInternal(Proto, Policy); 278 279 Out << Proto; 280 281 Out.flush(); 282 return Name.str().str(); 283 } 284 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 285 llvm::SmallString<256> Name; 286 llvm::raw_svector_ostream Out(Name); 287 Out << (MD->isInstanceMethod() ? '-' : '+'); 288 Out << '['; 289 290 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 291 // a null check to avoid a crash. 292 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 293 Out << ID; 294 295 if (const ObjCCategoryImplDecl *CID = 296 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 297 Out << '(' << CID << ')'; 298 299 Out << ' '; 300 Out << MD->getSelector().getAsString(); 301 Out << ']'; 302 303 Out.flush(); 304 return Name.str().str(); 305 } 306 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 307 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 308 return "top level"; 309 } 310 return ""; 311} 312 313/// getValueAsApproximateDouble - This returns the value as an inaccurate 314/// double. Note that this may cause loss of precision, but is useful for 315/// debugging dumps, etc. 316double FloatingLiteral::getValueAsApproximateDouble() const { 317 llvm::APFloat V = getValue(); 318 bool ignored; 319 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 320 &ignored); 321 return V.convertToDouble(); 322} 323 324StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 325 unsigned ByteLength, bool Wide, 326 QualType Ty, 327 const SourceLocation *Loc, 328 unsigned NumStrs) { 329 // Allocate enough space for the StringLiteral plus an array of locations for 330 // any concatenated string tokens. 331 void *Mem = C.Allocate(sizeof(StringLiteral)+ 332 sizeof(SourceLocation)*(NumStrs-1), 333 llvm::alignof<StringLiteral>()); 334 StringLiteral *SL = new (Mem) StringLiteral(Ty); 335 336 // OPTIMIZE: could allocate this appended to the StringLiteral. 337 char *AStrData = new (C, 1) char[ByteLength]; 338 memcpy(AStrData, StrData, ByteLength); 339 SL->StrData = AStrData; 340 SL->ByteLength = ByteLength; 341 SL->IsWide = Wide; 342 SL->TokLocs[0] = Loc[0]; 343 SL->NumConcatenated = NumStrs; 344 345 if (NumStrs != 1) 346 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 347 return SL; 348} 349 350StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 351 void *Mem = C.Allocate(sizeof(StringLiteral)+ 352 sizeof(SourceLocation)*(NumStrs-1), 353 llvm::alignof<StringLiteral>()); 354 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 355 SL->StrData = 0; 356 SL->ByteLength = 0; 357 SL->NumConcatenated = NumStrs; 358 return SL; 359} 360 361void StringLiteral::DoDestroy(ASTContext &C) { 362 C.Deallocate(const_cast<char*>(StrData)); 363 Expr::DoDestroy(C); 364} 365 366void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 367 if (StrData) 368 C.Deallocate(const_cast<char*>(StrData)); 369 370 char *AStrData = new (C, 1) char[Str.size()]; 371 memcpy(AStrData, Str.data(), Str.size()); 372 StrData = AStrData; 373 ByteLength = Str.size(); 374} 375 376/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 377/// corresponds to, e.g. "sizeof" or "[pre]++". 378const char *UnaryOperator::getOpcodeStr(Opcode Op) { 379 switch (Op) { 380 default: assert(0 && "Unknown unary operator"); 381 case PostInc: return "++"; 382 case PostDec: return "--"; 383 case PreInc: return "++"; 384 case PreDec: return "--"; 385 case AddrOf: return "&"; 386 case Deref: return "*"; 387 case Plus: return "+"; 388 case Minus: return "-"; 389 case Not: return "~"; 390 case LNot: return "!"; 391 case Real: return "__real"; 392 case Imag: return "__imag"; 393 case Extension: return "__extension__"; 394 case OffsetOf: return "__builtin_offsetof"; 395 } 396} 397 398UnaryOperator::Opcode 399UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 400 switch (OO) { 401 default: assert(false && "No unary operator for overloaded function"); 402 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 403 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 404 case OO_Amp: return AddrOf; 405 case OO_Star: return Deref; 406 case OO_Plus: return Plus; 407 case OO_Minus: return Minus; 408 case OO_Tilde: return Not; 409 case OO_Exclaim: return LNot; 410 } 411} 412 413OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 414 switch (Opc) { 415 case PostInc: case PreInc: return OO_PlusPlus; 416 case PostDec: case PreDec: return OO_MinusMinus; 417 case AddrOf: return OO_Amp; 418 case Deref: return OO_Star; 419 case Plus: return OO_Plus; 420 case Minus: return OO_Minus; 421 case Not: return OO_Tilde; 422 case LNot: return OO_Exclaim; 423 default: return OO_None; 424 } 425} 426 427 428//===----------------------------------------------------------------------===// 429// Postfix Operators. 430//===----------------------------------------------------------------------===// 431 432CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 433 unsigned numargs, QualType t, SourceLocation rparenloc) 434 : Expr(SC, t, 435 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 436 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 437 NumArgs(numargs) { 438 439 SubExprs = new (C) Stmt*[numargs+1]; 440 SubExprs[FN] = fn; 441 for (unsigned i = 0; i != numargs; ++i) 442 SubExprs[i+ARGS_START] = args[i]; 443 444 RParenLoc = rparenloc; 445} 446 447CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 448 QualType t, SourceLocation rparenloc) 449 : Expr(CallExprClass, t, 450 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 451 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 452 NumArgs(numargs) { 453 454 SubExprs = new (C) Stmt*[numargs+1]; 455 SubExprs[FN] = fn; 456 for (unsigned i = 0; i != numargs; ++i) 457 SubExprs[i+ARGS_START] = args[i]; 458 459 RParenLoc = rparenloc; 460} 461 462CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 463 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 464 SubExprs = new (C) Stmt*[1]; 465} 466 467void CallExpr::DoDestroy(ASTContext& C) { 468 DestroyChildren(C); 469 if (SubExprs) C.Deallocate(SubExprs); 470 this->~CallExpr(); 471 C.Deallocate(this); 472} 473 474Decl *CallExpr::getCalleeDecl() { 475 Expr *CEE = getCallee()->IgnoreParenCasts(); 476 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 477 return DRE->getDecl(); 478 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 479 return ME->getMemberDecl(); 480 481 return 0; 482} 483 484FunctionDecl *CallExpr::getDirectCallee() { 485 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 486} 487 488/// setNumArgs - This changes the number of arguments present in this call. 489/// Any orphaned expressions are deleted by this, and any new operands are set 490/// to null. 491void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 492 // No change, just return. 493 if (NumArgs == getNumArgs()) return; 494 495 // If shrinking # arguments, just delete the extras and forgot them. 496 if (NumArgs < getNumArgs()) { 497 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 498 getArg(i)->Destroy(C); 499 this->NumArgs = NumArgs; 500 return; 501 } 502 503 // Otherwise, we are growing the # arguments. New an bigger argument array. 504 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 505 // Copy over args. 506 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 507 NewSubExprs[i] = SubExprs[i]; 508 // Null out new args. 509 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 510 NewSubExprs[i] = 0; 511 512 if (SubExprs) C.Deallocate(SubExprs); 513 SubExprs = NewSubExprs; 514 this->NumArgs = NumArgs; 515} 516 517/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 518/// not, return 0. 519unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 520 // All simple function calls (e.g. func()) are implicitly cast to pointer to 521 // function. As a result, we try and obtain the DeclRefExpr from the 522 // ImplicitCastExpr. 523 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 524 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 525 return 0; 526 527 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 528 if (!DRE) 529 return 0; 530 531 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 532 if (!FDecl) 533 return 0; 534 535 if (!FDecl->getIdentifier()) 536 return 0; 537 538 return FDecl->getBuiltinID(); 539} 540 541QualType CallExpr::getCallReturnType() const { 542 QualType CalleeType = getCallee()->getType(); 543 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 544 CalleeType = FnTypePtr->getPointeeType(); 545 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 546 CalleeType = BPT->getPointeeType(); 547 548 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 549 return FnType->getResultType(); 550} 551 552MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 553 NestedNameSpecifier *qual, 554 SourceRange qualrange, 555 ValueDecl *memberdecl, 556 DeclAccessPair founddecl, 557 SourceLocation l, 558 const TemplateArgumentListInfo *targs, 559 QualType ty) { 560 std::size_t Size = sizeof(MemberExpr); 561 562 bool hasQualOrFound = (qual != 0 || 563 founddecl.getDecl() != memberdecl || 564 founddecl.getAccess() != memberdecl->getAccess()); 565 if (hasQualOrFound) 566 Size += sizeof(MemberNameQualifier); 567 568 if (targs) 569 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 570 571 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 572 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, l, ty); 573 574 if (hasQualOrFound) { 575 if (qual && qual->isDependent()) { 576 E->setValueDependent(true); 577 E->setTypeDependent(true); 578 } 579 E->HasQualifierOrFoundDecl = true; 580 581 MemberNameQualifier *NQ = E->getMemberQualifier(); 582 NQ->NNS = qual; 583 NQ->Range = qualrange; 584 NQ->FoundDecl = founddecl; 585 } 586 587 if (targs) { 588 E->HasExplicitTemplateArgumentList = true; 589 E->getExplicitTemplateArgumentList()->initializeFrom(*targs); 590 } 591 592 return E; 593} 594 595const char *CastExpr::getCastKindName() const { 596 switch (getCastKind()) { 597 case CastExpr::CK_Unknown: 598 return "Unknown"; 599 case CastExpr::CK_BitCast: 600 return "BitCast"; 601 case CastExpr::CK_NoOp: 602 return "NoOp"; 603 case CastExpr::CK_BaseToDerived: 604 return "BaseToDerived"; 605 case CastExpr::CK_DerivedToBase: 606 return "DerivedToBase"; 607 case CastExpr::CK_UncheckedDerivedToBase: 608 return "UncheckedDerivedToBase"; 609 case CastExpr::CK_Dynamic: 610 return "Dynamic"; 611 case CastExpr::CK_ToUnion: 612 return "ToUnion"; 613 case CastExpr::CK_ArrayToPointerDecay: 614 return "ArrayToPointerDecay"; 615 case CastExpr::CK_FunctionToPointerDecay: 616 return "FunctionToPointerDecay"; 617 case CastExpr::CK_NullToMemberPointer: 618 return "NullToMemberPointer"; 619 case CastExpr::CK_BaseToDerivedMemberPointer: 620 return "BaseToDerivedMemberPointer"; 621 case CastExpr::CK_DerivedToBaseMemberPointer: 622 return "DerivedToBaseMemberPointer"; 623 case CastExpr::CK_UserDefinedConversion: 624 return "UserDefinedConversion"; 625 case CastExpr::CK_ConstructorConversion: 626 return "ConstructorConversion"; 627 case CastExpr::CK_IntegralToPointer: 628 return "IntegralToPointer"; 629 case CastExpr::CK_PointerToIntegral: 630 return "PointerToIntegral"; 631 case CastExpr::CK_ToVoid: 632 return "ToVoid"; 633 case CastExpr::CK_VectorSplat: 634 return "VectorSplat"; 635 case CastExpr::CK_IntegralCast: 636 return "IntegralCast"; 637 case CastExpr::CK_IntegralToFloating: 638 return "IntegralToFloating"; 639 case CastExpr::CK_FloatingToIntegral: 640 return "FloatingToIntegral"; 641 case CastExpr::CK_FloatingCast: 642 return "FloatingCast"; 643 case CastExpr::CK_MemberPointerToBoolean: 644 return "MemberPointerToBoolean"; 645 case CastExpr::CK_AnyPointerToObjCPointerCast: 646 return "AnyPointerToObjCPointerCast"; 647 case CastExpr::CK_AnyPointerToBlockPointerCast: 648 return "AnyPointerToBlockPointerCast"; 649 } 650 651 assert(0 && "Unhandled cast kind!"); 652 return 0; 653} 654 655Expr *CastExpr::getSubExprAsWritten() { 656 Expr *SubExpr = 0; 657 CastExpr *E = this; 658 do { 659 SubExpr = E->getSubExpr(); 660 661 // Skip any temporary bindings; they're implicit. 662 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 663 SubExpr = Binder->getSubExpr(); 664 665 // Conversions by constructor and conversion functions have a 666 // subexpression describing the call; strip it off. 667 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 668 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 669 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 670 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 671 672 // If the subexpression we're left with is an implicit cast, look 673 // through that, too. 674 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 675 676 return SubExpr; 677} 678 679/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 680/// corresponds to, e.g. "<<=". 681const char *BinaryOperator::getOpcodeStr(Opcode Op) { 682 switch (Op) { 683 case PtrMemD: return ".*"; 684 case PtrMemI: return "->*"; 685 case Mul: return "*"; 686 case Div: return "/"; 687 case Rem: return "%"; 688 case Add: return "+"; 689 case Sub: return "-"; 690 case Shl: return "<<"; 691 case Shr: return ">>"; 692 case LT: return "<"; 693 case GT: return ">"; 694 case LE: return "<="; 695 case GE: return ">="; 696 case EQ: return "=="; 697 case NE: return "!="; 698 case And: return "&"; 699 case Xor: return "^"; 700 case Or: return "|"; 701 case LAnd: return "&&"; 702 case LOr: return "||"; 703 case Assign: return "="; 704 case MulAssign: return "*="; 705 case DivAssign: return "/="; 706 case RemAssign: return "%="; 707 case AddAssign: return "+="; 708 case SubAssign: return "-="; 709 case ShlAssign: return "<<="; 710 case ShrAssign: return ">>="; 711 case AndAssign: return "&="; 712 case XorAssign: return "^="; 713 case OrAssign: return "|="; 714 case Comma: return ","; 715 } 716 717 return ""; 718} 719 720BinaryOperator::Opcode 721BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 722 switch (OO) { 723 default: assert(false && "Not an overloadable binary operator"); 724 case OO_Plus: return Add; 725 case OO_Minus: return Sub; 726 case OO_Star: return Mul; 727 case OO_Slash: return Div; 728 case OO_Percent: return Rem; 729 case OO_Caret: return Xor; 730 case OO_Amp: return And; 731 case OO_Pipe: return Or; 732 case OO_Equal: return Assign; 733 case OO_Less: return LT; 734 case OO_Greater: return GT; 735 case OO_PlusEqual: return AddAssign; 736 case OO_MinusEqual: return SubAssign; 737 case OO_StarEqual: return MulAssign; 738 case OO_SlashEqual: return DivAssign; 739 case OO_PercentEqual: return RemAssign; 740 case OO_CaretEqual: return XorAssign; 741 case OO_AmpEqual: return AndAssign; 742 case OO_PipeEqual: return OrAssign; 743 case OO_LessLess: return Shl; 744 case OO_GreaterGreater: return Shr; 745 case OO_LessLessEqual: return ShlAssign; 746 case OO_GreaterGreaterEqual: return ShrAssign; 747 case OO_EqualEqual: return EQ; 748 case OO_ExclaimEqual: return NE; 749 case OO_LessEqual: return LE; 750 case OO_GreaterEqual: return GE; 751 case OO_AmpAmp: return LAnd; 752 case OO_PipePipe: return LOr; 753 case OO_Comma: return Comma; 754 case OO_ArrowStar: return PtrMemI; 755 } 756} 757 758OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 759 static const OverloadedOperatorKind OverOps[] = { 760 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 761 OO_Star, OO_Slash, OO_Percent, 762 OO_Plus, OO_Minus, 763 OO_LessLess, OO_GreaterGreater, 764 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 765 OO_EqualEqual, OO_ExclaimEqual, 766 OO_Amp, 767 OO_Caret, 768 OO_Pipe, 769 OO_AmpAmp, 770 OO_PipePipe, 771 OO_Equal, OO_StarEqual, 772 OO_SlashEqual, OO_PercentEqual, 773 OO_PlusEqual, OO_MinusEqual, 774 OO_LessLessEqual, OO_GreaterGreaterEqual, 775 OO_AmpEqual, OO_CaretEqual, 776 OO_PipeEqual, 777 OO_Comma 778 }; 779 return OverOps[Opc]; 780} 781 782InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 783 Expr **initExprs, unsigned numInits, 784 SourceLocation rbraceloc) 785 : Expr(InitListExprClass, QualType(), false, false), 786 InitExprs(C, numInits), 787 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 788 UnionFieldInit(0), HadArrayRangeDesignator(false) 789{ 790 for (unsigned I = 0; I != numInits; ++I) { 791 if (initExprs[I]->isTypeDependent()) 792 TypeDependent = true; 793 if (initExprs[I]->isValueDependent()) 794 ValueDependent = true; 795 } 796 797 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 798} 799 800void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 801 if (NumInits > InitExprs.size()) 802 InitExprs.reserve(C, NumInits); 803} 804 805void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 806 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 807 Idx < LastIdx; ++Idx) 808 InitExprs[Idx]->Destroy(C); 809 InitExprs.resize(C, NumInits, 0); 810} 811 812Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 813 if (Init >= InitExprs.size()) { 814 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 815 InitExprs.back() = expr; 816 return 0; 817 } 818 819 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 820 InitExprs[Init] = expr; 821 return Result; 822} 823 824/// getFunctionType - Return the underlying function type for this block. 825/// 826const FunctionType *BlockExpr::getFunctionType() const { 827 return getType()->getAs<BlockPointerType>()-> 828 getPointeeType()->getAs<FunctionType>(); 829} 830 831SourceLocation BlockExpr::getCaretLocation() const { 832 return TheBlock->getCaretLocation(); 833} 834const Stmt *BlockExpr::getBody() const { 835 return TheBlock->getBody(); 836} 837Stmt *BlockExpr::getBody() { 838 return TheBlock->getBody(); 839} 840 841 842//===----------------------------------------------------------------------===// 843// Generic Expression Routines 844//===----------------------------------------------------------------------===// 845 846/// isUnusedResultAWarning - Return true if this immediate expression should 847/// be warned about if the result is unused. If so, fill in Loc and Ranges 848/// with location to warn on and the source range[s] to report with the 849/// warning. 850bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 851 SourceRange &R2, ASTContext &Ctx) const { 852 // Don't warn if the expr is type dependent. The type could end up 853 // instantiating to void. 854 if (isTypeDependent()) 855 return false; 856 857 switch (getStmtClass()) { 858 default: 859 if (getType()->isVoidType()) 860 return false; 861 Loc = getExprLoc(); 862 R1 = getSourceRange(); 863 return true; 864 case ParenExprClass: 865 return cast<ParenExpr>(this)->getSubExpr()-> 866 isUnusedResultAWarning(Loc, R1, R2, Ctx); 867 case UnaryOperatorClass: { 868 const UnaryOperator *UO = cast<UnaryOperator>(this); 869 870 switch (UO->getOpcode()) { 871 default: break; 872 case UnaryOperator::PostInc: 873 case UnaryOperator::PostDec: 874 case UnaryOperator::PreInc: 875 case UnaryOperator::PreDec: // ++/-- 876 return false; // Not a warning. 877 case UnaryOperator::Deref: 878 // Dereferencing a volatile pointer is a side-effect. 879 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 880 return false; 881 break; 882 case UnaryOperator::Real: 883 case UnaryOperator::Imag: 884 // accessing a piece of a volatile complex is a side-effect. 885 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 886 .isVolatileQualified()) 887 return false; 888 break; 889 case UnaryOperator::Extension: 890 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 891 } 892 Loc = UO->getOperatorLoc(); 893 R1 = UO->getSubExpr()->getSourceRange(); 894 return true; 895 } 896 case BinaryOperatorClass: { 897 const BinaryOperator *BO = cast<BinaryOperator>(this); 898 switch (BO->getOpcode()) { 899 default: 900 break; 901 // Consider ',', '||', '&&' to have side effects if the LHS or RHS does. 902 case BinaryOperator::Comma: 903 // ((foo = <blah>), 0) is an idiom for hiding the result (and 904 // lvalue-ness) of an assignment written in a macro. 905 if (IntegerLiteral *IE = 906 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 907 if (IE->getValue() == 0) 908 return false; 909 case BinaryOperator::LAnd: 910 case BinaryOperator::LOr: 911 return (BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 912 BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 913 } 914 if (BO->isAssignmentOp()) 915 return false; 916 Loc = BO->getOperatorLoc(); 917 R1 = BO->getLHS()->getSourceRange(); 918 R2 = BO->getRHS()->getSourceRange(); 919 return true; 920 } 921 case CompoundAssignOperatorClass: 922 return false; 923 924 case ConditionalOperatorClass: { 925 // The condition must be evaluated, but if either the LHS or RHS is a 926 // warning, warn about them. 927 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 928 if (Exp->getLHS() && 929 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 930 return true; 931 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 932 } 933 934 case MemberExprClass: 935 // If the base pointer or element is to a volatile pointer/field, accessing 936 // it is a side effect. 937 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 938 return false; 939 Loc = cast<MemberExpr>(this)->getMemberLoc(); 940 R1 = SourceRange(Loc, Loc); 941 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 942 return true; 943 944 case ArraySubscriptExprClass: 945 // If the base pointer or element is to a volatile pointer/field, accessing 946 // it is a side effect. 947 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 948 return false; 949 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 950 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 951 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 952 return true; 953 954 case CallExprClass: 955 case CXXOperatorCallExprClass: 956 case CXXMemberCallExprClass: { 957 // If this is a direct call, get the callee. 958 const CallExpr *CE = cast<CallExpr>(this); 959 if (const Decl *FD = CE->getCalleeDecl()) { 960 // If the callee has attribute pure, const, or warn_unused_result, warn 961 // about it. void foo() { strlen("bar"); } should warn. 962 // 963 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 964 // updated to match for QoI. 965 if (FD->getAttr<WarnUnusedResultAttr>() || 966 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 967 Loc = CE->getCallee()->getLocStart(); 968 R1 = CE->getCallee()->getSourceRange(); 969 970 if (unsigned NumArgs = CE->getNumArgs()) 971 R2 = SourceRange(CE->getArg(0)->getLocStart(), 972 CE->getArg(NumArgs-1)->getLocEnd()); 973 return true; 974 } 975 } 976 return false; 977 } 978 979 case CXXTemporaryObjectExprClass: 980 case CXXConstructExprClass: 981 return false; 982 983 case ObjCMessageExprClass: { 984 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 985 const ObjCMethodDecl *MD = ME->getMethodDecl(); 986 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 987 Loc = getExprLoc(); 988 return true; 989 } 990 return false; 991 } 992 993 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 994#if 0 995 const ObjCImplicitSetterGetterRefExpr *Ref = 996 cast<ObjCImplicitSetterGetterRefExpr>(this); 997 // FIXME: We really want the location of the '.' here. 998 Loc = Ref->getLocation(); 999 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 1000 if (Ref->getBase()) 1001 R2 = Ref->getBase()->getSourceRange(); 1002#else 1003 Loc = getExprLoc(); 1004 R1 = getSourceRange(); 1005#endif 1006 return true; 1007 } 1008 case StmtExprClass: { 1009 // Statement exprs don't logically have side effects themselves, but are 1010 // sometimes used in macros in ways that give them a type that is unused. 1011 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1012 // however, if the result of the stmt expr is dead, we don't want to emit a 1013 // warning. 1014 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1015 if (!CS->body_empty()) 1016 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1017 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1018 1019 if (getType()->isVoidType()) 1020 return false; 1021 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1022 R1 = getSourceRange(); 1023 return true; 1024 } 1025 case CStyleCastExprClass: 1026 // If this is an explicit cast to void, allow it. People do this when they 1027 // think they know what they're doing :). 1028 if (getType()->isVoidType()) 1029 return false; 1030 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1031 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1032 return true; 1033 case CXXFunctionalCastExprClass: { 1034 if (getType()->isVoidType()) 1035 return false; 1036 const CastExpr *CE = cast<CastExpr>(this); 1037 1038 // If this is a cast to void or a constructor conversion, check the operand. 1039 // Otherwise, the result of the cast is unused. 1040 if (CE->getCastKind() == CastExpr::CK_ToVoid || 1041 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 1042 return (cast<CastExpr>(this)->getSubExpr() 1043 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1044 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1045 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1046 return true; 1047 } 1048 1049 case ImplicitCastExprClass: 1050 // Check the operand, since implicit casts are inserted by Sema 1051 return (cast<ImplicitCastExpr>(this) 1052 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1053 1054 case CXXDefaultArgExprClass: 1055 return (cast<CXXDefaultArgExpr>(this) 1056 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1057 1058 case CXXNewExprClass: 1059 // FIXME: In theory, there might be new expressions that don't have side 1060 // effects (e.g. a placement new with an uninitialized POD). 1061 case CXXDeleteExprClass: 1062 return false; 1063 case CXXBindTemporaryExprClass: 1064 return (cast<CXXBindTemporaryExpr>(this) 1065 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1066 case CXXExprWithTemporariesClass: 1067 return (cast<CXXExprWithTemporaries>(this) 1068 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1069 } 1070} 1071 1072/// DeclCanBeLvalue - Determine whether the given declaration can be 1073/// an lvalue. This is a helper routine for isLvalue. 1074static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 1075 // C++ [temp.param]p6: 1076 // A non-type non-reference template-parameter is not an lvalue. 1077 if (const NonTypeTemplateParmDecl *NTTParm 1078 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 1079 return NTTParm->getType()->isReferenceType(); 1080 1081 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 1082 // C++ 3.10p2: An lvalue refers to an object or function. 1083 (Ctx.getLangOptions().CPlusPlus && 1084 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 1085} 1086 1087/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 1088/// incomplete type other than void. Nonarray expressions that can be lvalues: 1089/// - name, where name must be a variable 1090/// - e[i] 1091/// - (e), where e must be an lvalue 1092/// - e.name, where e must be an lvalue 1093/// - e->name 1094/// - *e, the type of e cannot be a function type 1095/// - string-constant 1096/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1097/// - reference type [C++ [expr]] 1098/// 1099Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1100 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1101 1102 isLvalueResult Res = isLvalueInternal(Ctx); 1103 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1104 return Res; 1105 1106 // first, check the type (C99 6.3.2.1). Expressions with function 1107 // type in C are not lvalues, but they can be lvalues in C++. 1108 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1109 return LV_NotObjectType; 1110 1111 // Allow qualified void which is an incomplete type other than void (yuck). 1112 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1113 return LV_IncompleteVoidType; 1114 1115 return LV_Valid; 1116} 1117 1118// Check whether the expression can be sanely treated like an l-value 1119Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1120 switch (getStmtClass()) { 1121 case ObjCIsaExprClass: 1122 case StringLiteralClass: // C99 6.5.1p4 1123 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1124 return LV_Valid; 1125 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1126 // For vectors, make sure base is an lvalue (i.e. not a function call). 1127 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1128 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1129 return LV_Valid; 1130 case DeclRefExprClass: { // C99 6.5.1p2 1131 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1132 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1133 return LV_Valid; 1134 break; 1135 } 1136 case BlockDeclRefExprClass: { 1137 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1138 if (isa<VarDecl>(BDR->getDecl())) 1139 return LV_Valid; 1140 break; 1141 } 1142 case MemberExprClass: { 1143 const MemberExpr *m = cast<MemberExpr>(this); 1144 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1145 NamedDecl *Member = m->getMemberDecl(); 1146 // C++ [expr.ref]p4: 1147 // If E2 is declared to have type "reference to T", then E1.E2 1148 // is an lvalue. 1149 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1150 if (Value->getType()->isReferenceType()) 1151 return LV_Valid; 1152 1153 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1154 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1155 return LV_Valid; 1156 1157 // -- If E2 is a non-static data member [...]. If E1 is an 1158 // lvalue, then E1.E2 is an lvalue. 1159 if (isa<FieldDecl>(Member)) { 1160 if (m->isArrow()) 1161 return LV_Valid; 1162 return m->getBase()->isLvalue(Ctx); 1163 } 1164 1165 // -- If it refers to a static member function [...], then 1166 // E1.E2 is an lvalue. 1167 // -- Otherwise, if E1.E2 refers to a non-static member 1168 // function [...], then E1.E2 is not an lvalue. 1169 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1170 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1171 1172 // -- If E2 is a member enumerator [...], the expression E1.E2 1173 // is not an lvalue. 1174 if (isa<EnumConstantDecl>(Member)) 1175 return LV_InvalidExpression; 1176 1177 // Not an lvalue. 1178 return LV_InvalidExpression; 1179 } 1180 1181 // C99 6.5.2.3p4 1182 if (m->isArrow()) 1183 return LV_Valid; 1184 Expr *BaseExp = m->getBase(); 1185 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass || 1186 BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) 1187 return LV_SubObjCPropertySetting; 1188 return 1189 BaseExp->isLvalue(Ctx); 1190 } 1191 case UnaryOperatorClass: 1192 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1193 return LV_Valid; // C99 6.5.3p4 1194 1195 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1196 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1197 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1198 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1199 1200 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1201 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1202 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1203 return LV_Valid; 1204 break; 1205 case ImplicitCastExprClass: 1206 if (cast<ImplicitCastExpr>(this)->isLvalueCast()) 1207 return LV_Valid; 1208 1209 // If this is a conversion to a class temporary, make a note of 1210 // that. 1211 if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType()) 1212 return LV_ClassTemporary; 1213 1214 break; 1215 case ParenExprClass: // C99 6.5.1p5 1216 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1217 case BinaryOperatorClass: 1218 case CompoundAssignOperatorClass: { 1219 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1220 1221 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1222 BinOp->getOpcode() == BinaryOperator::Comma) 1223 return BinOp->getRHS()->isLvalue(Ctx); 1224 1225 // C++ [expr.mptr.oper]p6 1226 // The result of a .* expression is an lvalue only if its first operand is 1227 // an lvalue and its second operand is a pointer to data member. 1228 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1229 !BinOp->getType()->isFunctionType()) 1230 return BinOp->getLHS()->isLvalue(Ctx); 1231 1232 // The result of an ->* expression is an lvalue only if its second operand 1233 // is a pointer to data member. 1234 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1235 !BinOp->getType()->isFunctionType()) { 1236 QualType Ty = BinOp->getRHS()->getType(); 1237 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1238 return LV_Valid; 1239 } 1240 1241 if (!BinOp->isAssignmentOp()) 1242 return LV_InvalidExpression; 1243 1244 if (Ctx.getLangOptions().CPlusPlus) 1245 // C++ [expr.ass]p1: 1246 // The result of an assignment operation [...] is an lvalue. 1247 return LV_Valid; 1248 1249 1250 // C99 6.5.16: 1251 // An assignment expression [...] is not an lvalue. 1252 return LV_InvalidExpression; 1253 } 1254 case CallExprClass: 1255 case CXXOperatorCallExprClass: 1256 case CXXMemberCallExprClass: { 1257 // C++0x [expr.call]p10 1258 // A function call is an lvalue if and only if the result type 1259 // is an lvalue reference. 1260 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1261 if (ReturnType->isLValueReferenceType()) 1262 return LV_Valid; 1263 1264 // If the function is returning a class temporary, make a note of 1265 // that. 1266 if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType()) 1267 return LV_ClassTemporary; 1268 1269 break; 1270 } 1271 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1272 // FIXME: Is this what we want in C++? 1273 return LV_Valid; 1274 case ChooseExprClass: 1275 // __builtin_choose_expr is an lvalue if the selected operand is. 1276 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1277 case ExtVectorElementExprClass: 1278 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1279 return LV_DuplicateVectorComponents; 1280 return LV_Valid; 1281 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1282 return LV_Valid; 1283 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1284 return LV_Valid; 1285 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1286 return LV_Valid; 1287 case PredefinedExprClass: 1288 return LV_Valid; 1289 case UnresolvedLookupExprClass: 1290 return LV_Valid; 1291 case CXXDefaultArgExprClass: 1292 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1293 case CStyleCastExprClass: 1294 case CXXFunctionalCastExprClass: 1295 case CXXStaticCastExprClass: 1296 case CXXDynamicCastExprClass: 1297 case CXXReinterpretCastExprClass: 1298 case CXXConstCastExprClass: 1299 // The result of an explicit cast is an lvalue if the type we are 1300 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1301 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1302 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1303 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1304 isLValueReferenceType()) 1305 return LV_Valid; 1306 1307 // If this is a conversion to a class temporary, make a note of 1308 // that. 1309 if (Ctx.getLangOptions().CPlusPlus && 1310 cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType()) 1311 return LV_ClassTemporary; 1312 1313 break; 1314 case CXXTypeidExprClass: 1315 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1316 return LV_Valid; 1317 case CXXBindTemporaryExprClass: 1318 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1319 isLvalueInternal(Ctx); 1320 case CXXBindReferenceExprClass: 1321 // Something that's bound to a reference is always an lvalue. 1322 return LV_Valid; 1323 case ConditionalOperatorClass: { 1324 // Complicated handling is only for C++. 1325 if (!Ctx.getLangOptions().CPlusPlus) 1326 return LV_InvalidExpression; 1327 1328 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1329 // everywhere there's an object converted to an rvalue. Also, any other 1330 // casts should be wrapped by ImplicitCastExprs. There's just the special 1331 // case involving throws to work out. 1332 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1333 Expr *True = Cond->getTrueExpr(); 1334 Expr *False = Cond->getFalseExpr(); 1335 // C++0x 5.16p2 1336 // If either the second or the third operand has type (cv) void, [...] 1337 // the result [...] is an rvalue. 1338 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1339 return LV_InvalidExpression; 1340 1341 // Both sides must be lvalues for the result to be an lvalue. 1342 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1343 return LV_InvalidExpression; 1344 1345 // That's it. 1346 return LV_Valid; 1347 } 1348 1349 case Expr::CXXExprWithTemporariesClass: 1350 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1351 1352 case Expr::ObjCMessageExprClass: 1353 if (const ObjCMethodDecl *Method 1354 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1355 if (Method->getResultType()->isLValueReferenceType()) 1356 return LV_Valid; 1357 break; 1358 1359 case Expr::CXXConstructExprClass: 1360 case Expr::CXXTemporaryObjectExprClass: 1361 case Expr::CXXZeroInitValueExprClass: 1362 return LV_ClassTemporary; 1363 1364 default: 1365 break; 1366 } 1367 return LV_InvalidExpression; 1368} 1369 1370/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1371/// does not have an incomplete type, does not have a const-qualified type, and 1372/// if it is a structure or union, does not have any member (including, 1373/// recursively, any member or element of all contained aggregates or unions) 1374/// with a const-qualified type. 1375Expr::isModifiableLvalueResult 1376Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1377 isLvalueResult lvalResult = isLvalue(Ctx); 1378 1379 switch (lvalResult) { 1380 case LV_Valid: 1381 // C++ 3.10p11: Functions cannot be modified, but pointers to 1382 // functions can be modifiable. 1383 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1384 return MLV_NotObjectType; 1385 break; 1386 1387 case LV_NotObjectType: return MLV_NotObjectType; 1388 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1389 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1390 case LV_InvalidExpression: 1391 // If the top level is a C-style cast, and the subexpression is a valid 1392 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1393 // GCC extension. We don't support it, but we want to produce good 1394 // diagnostics when it happens so that the user knows why. 1395 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1396 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1397 if (Loc) 1398 *Loc = CE->getLParenLoc(); 1399 return MLV_LValueCast; 1400 } 1401 } 1402 return MLV_InvalidExpression; 1403 case LV_MemberFunction: return MLV_MemberFunction; 1404 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1405 case LV_ClassTemporary: 1406 return MLV_ClassTemporary; 1407 } 1408 1409 // The following is illegal: 1410 // void takeclosure(void (^C)(void)); 1411 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1412 // 1413 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1414 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1415 return MLV_NotBlockQualified; 1416 } 1417 1418 // Assigning to an 'implicit' property? 1419 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1420 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1421 if (Expr->getSetterMethod() == 0) 1422 return MLV_NoSetterProperty; 1423 } 1424 1425 QualType CT = Ctx.getCanonicalType(getType()); 1426 1427 if (CT.isConstQualified()) 1428 return MLV_ConstQualified; 1429 if (CT->isArrayType()) 1430 return MLV_ArrayType; 1431 if (CT->isIncompleteType()) 1432 return MLV_IncompleteType; 1433 1434 if (const RecordType *r = CT->getAs<RecordType>()) { 1435 if (r->hasConstFields()) 1436 return MLV_ConstQualified; 1437 } 1438 1439 return MLV_Valid; 1440} 1441 1442/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1443/// returns true, if it is; false otherwise. 1444bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1445 switch (getStmtClass()) { 1446 default: 1447 return false; 1448 case ObjCIvarRefExprClass: 1449 return true; 1450 case Expr::UnaryOperatorClass: 1451 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1452 case ParenExprClass: 1453 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1454 case ImplicitCastExprClass: 1455 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1456 case CStyleCastExprClass: 1457 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1458 case DeclRefExprClass: { 1459 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1460 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1461 if (VD->hasGlobalStorage()) 1462 return true; 1463 QualType T = VD->getType(); 1464 // dereferencing to a pointer is always a gc'able candidate, 1465 // unless it is __weak. 1466 return T->isPointerType() && 1467 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1468 } 1469 return false; 1470 } 1471 case MemberExprClass: { 1472 const MemberExpr *M = cast<MemberExpr>(this); 1473 return M->getBase()->isOBJCGCCandidate(Ctx); 1474 } 1475 case ArraySubscriptExprClass: 1476 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1477 } 1478} 1479Expr* Expr::IgnoreParens() { 1480 Expr* E = this; 1481 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1482 E = P->getSubExpr(); 1483 1484 return E; 1485} 1486 1487/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1488/// or CastExprs or ImplicitCastExprs, returning their operand. 1489Expr *Expr::IgnoreParenCasts() { 1490 Expr *E = this; 1491 while (true) { 1492 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1493 E = P->getSubExpr(); 1494 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1495 E = P->getSubExpr(); 1496 else 1497 return E; 1498 } 1499} 1500 1501/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1502/// value (including ptr->int casts of the same size). Strip off any 1503/// ParenExpr or CastExprs, returning their operand. 1504Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1505 Expr *E = this; 1506 while (true) { 1507 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1508 E = P->getSubExpr(); 1509 continue; 1510 } 1511 1512 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1513 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1514 // ptr<->int casts of the same width. We also ignore all identify casts. 1515 Expr *SE = P->getSubExpr(); 1516 1517 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1518 E = SE; 1519 continue; 1520 } 1521 1522 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1523 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1524 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1525 E = SE; 1526 continue; 1527 } 1528 } 1529 1530 return E; 1531 } 1532} 1533 1534bool Expr::isDefaultArgument() const { 1535 const Expr *E = this; 1536 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1537 E = ICE->getSubExprAsWritten(); 1538 1539 return isa<CXXDefaultArgExpr>(E); 1540} 1541 1542/// \brief Skip over any no-op casts and any temporary-binding 1543/// expressions. 1544static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1545 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1546 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1547 E = ICE->getSubExpr(); 1548 else 1549 break; 1550 } 1551 1552 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1553 E = BE->getSubExpr(); 1554 1555 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1556 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1557 E = ICE->getSubExpr(); 1558 else 1559 break; 1560 } 1561 1562 return E; 1563} 1564 1565const Expr *Expr::getTemporaryObject() const { 1566 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1567 1568 // A cast can produce a temporary object. The object's construction 1569 // is represented as a CXXConstructExpr. 1570 if (const CastExpr *Cast = dyn_cast<CastExpr>(E)) { 1571 // Only user-defined and constructor conversions can produce 1572 // temporary objects. 1573 if (Cast->getCastKind() != CastExpr::CK_ConstructorConversion && 1574 Cast->getCastKind() != CastExpr::CK_UserDefinedConversion) 1575 return 0; 1576 1577 // Strip off temporary bindings and no-op casts. 1578 const Expr *Sub = skipTemporaryBindingsAndNoOpCasts(Cast->getSubExpr()); 1579 1580 // If this is a constructor conversion, see if we have an object 1581 // construction. 1582 if (Cast->getCastKind() == CastExpr::CK_ConstructorConversion) 1583 return dyn_cast<CXXConstructExpr>(Sub); 1584 1585 // If this is a user-defined conversion, see if we have a call to 1586 // a function that itself returns a temporary object. 1587 if (Cast->getCastKind() == CastExpr::CK_UserDefinedConversion) 1588 if (const CallExpr *CE = dyn_cast<CallExpr>(Sub)) 1589 if (CE->getCallReturnType()->isRecordType()) 1590 return CE; 1591 1592 return 0; 1593 } 1594 1595 // A call returning a class type returns a temporary. 1596 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1597 if (CE->getCallReturnType()->isRecordType()) 1598 return CE; 1599 1600 return 0; 1601 } 1602 1603 // Explicit temporary object constructors create temporaries. 1604 return dyn_cast<CXXTemporaryObjectExpr>(E); 1605} 1606 1607/// hasAnyTypeDependentArguments - Determines if any of the expressions 1608/// in Exprs is type-dependent. 1609bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1610 for (unsigned I = 0; I < NumExprs; ++I) 1611 if (Exprs[I]->isTypeDependent()) 1612 return true; 1613 1614 return false; 1615} 1616 1617/// hasAnyValueDependentArguments - Determines if any of the expressions 1618/// in Exprs is value-dependent. 1619bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1620 for (unsigned I = 0; I < NumExprs; ++I) 1621 if (Exprs[I]->isValueDependent()) 1622 return true; 1623 1624 return false; 1625} 1626 1627bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1628 // This function is attempting whether an expression is an initializer 1629 // which can be evaluated at compile-time. isEvaluatable handles most 1630 // of the cases, but it can't deal with some initializer-specific 1631 // expressions, and it can't deal with aggregates; we deal with those here, 1632 // and fall back to isEvaluatable for the other cases. 1633 1634 // FIXME: This function assumes the variable being assigned to 1635 // isn't a reference type! 1636 1637 switch (getStmtClass()) { 1638 default: break; 1639 case StringLiteralClass: 1640 case ObjCStringLiteralClass: 1641 case ObjCEncodeExprClass: 1642 return true; 1643 case CompoundLiteralExprClass: { 1644 // This handles gcc's extension that allows global initializers like 1645 // "struct x {int x;} x = (struct x) {};". 1646 // FIXME: This accepts other cases it shouldn't! 1647 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1648 return Exp->isConstantInitializer(Ctx); 1649 } 1650 case InitListExprClass: { 1651 // FIXME: This doesn't deal with fields with reference types correctly. 1652 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1653 // to bitfields. 1654 const InitListExpr *Exp = cast<InitListExpr>(this); 1655 unsigned numInits = Exp->getNumInits(); 1656 for (unsigned i = 0; i < numInits; i++) { 1657 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1658 return false; 1659 } 1660 return true; 1661 } 1662 case ImplicitValueInitExprClass: 1663 return true; 1664 case ParenExprClass: 1665 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1666 case UnaryOperatorClass: { 1667 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1668 if (Exp->getOpcode() == UnaryOperator::Extension) 1669 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1670 break; 1671 } 1672 case BinaryOperatorClass: { 1673 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1674 // but this handles the common case. 1675 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1676 if (Exp->getOpcode() == BinaryOperator::Sub && 1677 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1678 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1679 return true; 1680 break; 1681 } 1682 case ImplicitCastExprClass: 1683 case CStyleCastExprClass: 1684 // Handle casts with a destination that's a struct or union; this 1685 // deals with both the gcc no-op struct cast extension and the 1686 // cast-to-union extension. 1687 if (getType()->isRecordType()) 1688 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1689 1690 // Integer->integer casts can be handled here, which is important for 1691 // things like (int)(&&x-&&y). Scary but true. 1692 if (getType()->isIntegerType() && 1693 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1694 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1695 1696 break; 1697 } 1698 return isEvaluatable(Ctx); 1699} 1700 1701/// isIntegerConstantExpr - this recursive routine will test if an expression is 1702/// an integer constant expression. 1703 1704/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1705/// comma, etc 1706/// 1707/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1708/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1709/// cast+dereference. 1710 1711// CheckICE - This function does the fundamental ICE checking: the returned 1712// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1713// Note that to reduce code duplication, this helper does no evaluation 1714// itself; the caller checks whether the expression is evaluatable, and 1715// in the rare cases where CheckICE actually cares about the evaluated 1716// value, it calls into Evalute. 1717// 1718// Meanings of Val: 1719// 0: This expression is an ICE if it can be evaluated by Evaluate. 1720// 1: This expression is not an ICE, but if it isn't evaluated, it's 1721// a legal subexpression for an ICE. This return value is used to handle 1722// the comma operator in C99 mode. 1723// 2: This expression is not an ICE, and is not a legal subexpression for one. 1724 1725struct ICEDiag { 1726 unsigned Val; 1727 SourceLocation Loc; 1728 1729 public: 1730 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1731 ICEDiag() : Val(0) {} 1732}; 1733 1734ICEDiag NoDiag() { return ICEDiag(); } 1735 1736static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1737 Expr::EvalResult EVResult; 1738 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1739 !EVResult.Val.isInt()) { 1740 return ICEDiag(2, E->getLocStart()); 1741 } 1742 return NoDiag(); 1743} 1744 1745static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1746 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1747 if (!E->getType()->isIntegralType()) { 1748 return ICEDiag(2, E->getLocStart()); 1749 } 1750 1751 switch (E->getStmtClass()) { 1752#define STMT(Node, Base) case Expr::Node##Class: 1753#define EXPR(Node, Base) 1754#include "clang/AST/StmtNodes.def" 1755 case Expr::PredefinedExprClass: 1756 case Expr::FloatingLiteralClass: 1757 case Expr::ImaginaryLiteralClass: 1758 case Expr::StringLiteralClass: 1759 case Expr::ArraySubscriptExprClass: 1760 case Expr::MemberExprClass: 1761 case Expr::CompoundAssignOperatorClass: 1762 case Expr::CompoundLiteralExprClass: 1763 case Expr::ExtVectorElementExprClass: 1764 case Expr::InitListExprClass: 1765 case Expr::DesignatedInitExprClass: 1766 case Expr::ImplicitValueInitExprClass: 1767 case Expr::ParenListExprClass: 1768 case Expr::VAArgExprClass: 1769 case Expr::AddrLabelExprClass: 1770 case Expr::StmtExprClass: 1771 case Expr::CXXMemberCallExprClass: 1772 case Expr::CXXDynamicCastExprClass: 1773 case Expr::CXXTypeidExprClass: 1774 case Expr::CXXNullPtrLiteralExprClass: 1775 case Expr::CXXThisExprClass: 1776 case Expr::CXXThrowExprClass: 1777 case Expr::CXXNewExprClass: 1778 case Expr::CXXDeleteExprClass: 1779 case Expr::CXXPseudoDestructorExprClass: 1780 case Expr::UnresolvedLookupExprClass: 1781 case Expr::DependentScopeDeclRefExprClass: 1782 case Expr::CXXConstructExprClass: 1783 case Expr::CXXBindTemporaryExprClass: 1784 case Expr::CXXBindReferenceExprClass: 1785 case Expr::CXXExprWithTemporariesClass: 1786 case Expr::CXXTemporaryObjectExprClass: 1787 case Expr::CXXUnresolvedConstructExprClass: 1788 case Expr::CXXDependentScopeMemberExprClass: 1789 case Expr::UnresolvedMemberExprClass: 1790 case Expr::ObjCStringLiteralClass: 1791 case Expr::ObjCEncodeExprClass: 1792 case Expr::ObjCMessageExprClass: 1793 case Expr::ObjCSelectorExprClass: 1794 case Expr::ObjCProtocolExprClass: 1795 case Expr::ObjCIvarRefExprClass: 1796 case Expr::ObjCPropertyRefExprClass: 1797 case Expr::ObjCImplicitSetterGetterRefExprClass: 1798 case Expr::ObjCSuperExprClass: 1799 case Expr::ObjCIsaExprClass: 1800 case Expr::ShuffleVectorExprClass: 1801 case Expr::BlockExprClass: 1802 case Expr::BlockDeclRefExprClass: 1803 case Expr::NoStmtClass: 1804 return ICEDiag(2, E->getLocStart()); 1805 1806 case Expr::GNUNullExprClass: 1807 // GCC considers the GNU __null value to be an integral constant expression. 1808 return NoDiag(); 1809 1810 case Expr::ParenExprClass: 1811 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1812 case Expr::IntegerLiteralClass: 1813 case Expr::CharacterLiteralClass: 1814 case Expr::CXXBoolLiteralExprClass: 1815 case Expr::CXXZeroInitValueExprClass: 1816 case Expr::TypesCompatibleExprClass: 1817 case Expr::UnaryTypeTraitExprClass: 1818 return NoDiag(); 1819 case Expr::CallExprClass: 1820 case Expr::CXXOperatorCallExprClass: { 1821 const CallExpr *CE = cast<CallExpr>(E); 1822 if (CE->isBuiltinCall(Ctx)) 1823 return CheckEvalInICE(E, Ctx); 1824 return ICEDiag(2, E->getLocStart()); 1825 } 1826 case Expr::DeclRefExprClass: 1827 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1828 return NoDiag(); 1829 if (Ctx.getLangOptions().CPlusPlus && 1830 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1831 const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 1832 1833 // Parameter variables are never constants. Without this check, 1834 // getAnyInitializer() can find a default argument, which leads 1835 // to chaos. 1836 if (isa<ParmVarDecl>(D)) 1837 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1838 1839 // C++ 7.1.5.1p2 1840 // A variable of non-volatile const-qualified integral or enumeration 1841 // type initialized by an ICE can be used in ICEs. 1842 if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 1843 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1844 if (Quals.hasVolatile() || !Quals.hasConst()) 1845 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1846 1847 // Look for a declaration of this variable that has an initializer. 1848 const VarDecl *ID = 0; 1849 const Expr *Init = Dcl->getAnyInitializer(ID); 1850 if (Init) { 1851 if (ID->isInitKnownICE()) { 1852 // We have already checked whether this subexpression is an 1853 // integral constant expression. 1854 if (ID->isInitICE()) 1855 return NoDiag(); 1856 else 1857 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1858 } 1859 1860 // It's an ICE whether or not the definition we found is 1861 // out-of-line. See DR 721 and the discussion in Clang PR 1862 // 6206 for details. 1863 1864 if (Dcl->isCheckingICE()) { 1865 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1866 } 1867 1868 Dcl->setCheckingICE(); 1869 ICEDiag Result = CheckICE(Init, Ctx); 1870 // Cache the result of the ICE test. 1871 Dcl->setInitKnownICE(Result.Val == 0); 1872 return Result; 1873 } 1874 } 1875 } 1876 return ICEDiag(2, E->getLocStart()); 1877 case Expr::UnaryOperatorClass: { 1878 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1879 switch (Exp->getOpcode()) { 1880 case UnaryOperator::PostInc: 1881 case UnaryOperator::PostDec: 1882 case UnaryOperator::PreInc: 1883 case UnaryOperator::PreDec: 1884 case UnaryOperator::AddrOf: 1885 case UnaryOperator::Deref: 1886 return ICEDiag(2, E->getLocStart()); 1887 1888 case UnaryOperator::Extension: 1889 case UnaryOperator::LNot: 1890 case UnaryOperator::Plus: 1891 case UnaryOperator::Minus: 1892 case UnaryOperator::Not: 1893 case UnaryOperator::Real: 1894 case UnaryOperator::Imag: 1895 return CheckICE(Exp->getSubExpr(), Ctx); 1896 case UnaryOperator::OffsetOf: 1897 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1898 // Evaluate matches the proposed gcc behavior for cases like 1899 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1900 // compliance: we should warn earlier for offsetof expressions with 1901 // array subscripts that aren't ICEs, and if the array subscripts 1902 // are ICEs, the value of the offsetof must be an integer constant. 1903 return CheckEvalInICE(E, Ctx); 1904 } 1905 } 1906 case Expr::SizeOfAlignOfExprClass: { 1907 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1908 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1909 return ICEDiag(2, E->getLocStart()); 1910 return NoDiag(); 1911 } 1912 case Expr::BinaryOperatorClass: { 1913 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1914 switch (Exp->getOpcode()) { 1915 case BinaryOperator::PtrMemD: 1916 case BinaryOperator::PtrMemI: 1917 case BinaryOperator::Assign: 1918 case BinaryOperator::MulAssign: 1919 case BinaryOperator::DivAssign: 1920 case BinaryOperator::RemAssign: 1921 case BinaryOperator::AddAssign: 1922 case BinaryOperator::SubAssign: 1923 case BinaryOperator::ShlAssign: 1924 case BinaryOperator::ShrAssign: 1925 case BinaryOperator::AndAssign: 1926 case BinaryOperator::XorAssign: 1927 case BinaryOperator::OrAssign: 1928 return ICEDiag(2, E->getLocStart()); 1929 1930 case BinaryOperator::Mul: 1931 case BinaryOperator::Div: 1932 case BinaryOperator::Rem: 1933 case BinaryOperator::Add: 1934 case BinaryOperator::Sub: 1935 case BinaryOperator::Shl: 1936 case BinaryOperator::Shr: 1937 case BinaryOperator::LT: 1938 case BinaryOperator::GT: 1939 case BinaryOperator::LE: 1940 case BinaryOperator::GE: 1941 case BinaryOperator::EQ: 1942 case BinaryOperator::NE: 1943 case BinaryOperator::And: 1944 case BinaryOperator::Xor: 1945 case BinaryOperator::Or: 1946 case BinaryOperator::Comma: { 1947 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1948 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1949 if (Exp->getOpcode() == BinaryOperator::Div || 1950 Exp->getOpcode() == BinaryOperator::Rem) { 1951 // Evaluate gives an error for undefined Div/Rem, so make sure 1952 // we don't evaluate one. 1953 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1954 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1955 if (REval == 0) 1956 return ICEDiag(1, E->getLocStart()); 1957 if (REval.isSigned() && REval.isAllOnesValue()) { 1958 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1959 if (LEval.isMinSignedValue()) 1960 return ICEDiag(1, E->getLocStart()); 1961 } 1962 } 1963 } 1964 if (Exp->getOpcode() == BinaryOperator::Comma) { 1965 if (Ctx.getLangOptions().C99) { 1966 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1967 // if it isn't evaluated. 1968 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1969 return ICEDiag(1, E->getLocStart()); 1970 } else { 1971 // In both C89 and C++, commas in ICEs are illegal. 1972 return ICEDiag(2, E->getLocStart()); 1973 } 1974 } 1975 if (LHSResult.Val >= RHSResult.Val) 1976 return LHSResult; 1977 return RHSResult; 1978 } 1979 case BinaryOperator::LAnd: 1980 case BinaryOperator::LOr: { 1981 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1982 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1983 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1984 // Rare case where the RHS has a comma "side-effect"; we need 1985 // to actually check the condition to see whether the side 1986 // with the comma is evaluated. 1987 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1988 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1989 return RHSResult; 1990 return NoDiag(); 1991 } 1992 1993 if (LHSResult.Val >= RHSResult.Val) 1994 return LHSResult; 1995 return RHSResult; 1996 } 1997 } 1998 } 1999 case Expr::ImplicitCastExprClass: 2000 case Expr::CStyleCastExprClass: 2001 case Expr::CXXFunctionalCastExprClass: 2002 case Expr::CXXNamedCastExprClass: 2003 case Expr::CXXStaticCastExprClass: 2004 case Expr::CXXReinterpretCastExprClass: 2005 case Expr::CXXConstCastExprClass: { 2006 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 2007 if (SubExpr->getType()->isIntegralType()) 2008 return CheckICE(SubExpr, Ctx); 2009 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 2010 return NoDiag(); 2011 return ICEDiag(2, E->getLocStart()); 2012 } 2013 case Expr::ConditionalOperatorClass: { 2014 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 2015 // If the condition (ignoring parens) is a __builtin_constant_p call, 2016 // then only the true side is actually considered in an integer constant 2017 // expression, and it is fully evaluated. This is an important GNU 2018 // extension. See GCC PR38377 for discussion. 2019 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 2020 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 2021 Expr::EvalResult EVResult; 2022 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 2023 !EVResult.Val.isInt()) { 2024 return ICEDiag(2, E->getLocStart()); 2025 } 2026 return NoDiag(); 2027 } 2028 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 2029 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 2030 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 2031 if (CondResult.Val == 2) 2032 return CondResult; 2033 if (TrueResult.Val == 2) 2034 return TrueResult; 2035 if (FalseResult.Val == 2) 2036 return FalseResult; 2037 if (CondResult.Val == 1) 2038 return CondResult; 2039 if (TrueResult.Val == 0 && FalseResult.Val == 0) 2040 return NoDiag(); 2041 // Rare case where the diagnostics depend on which side is evaluated 2042 // Note that if we get here, CondResult is 0, and at least one of 2043 // TrueResult and FalseResult is non-zero. 2044 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 2045 return FalseResult; 2046 } 2047 return TrueResult; 2048 } 2049 case Expr::CXXDefaultArgExprClass: 2050 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 2051 case Expr::ChooseExprClass: { 2052 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 2053 } 2054 } 2055 2056 // Silence a GCC warning 2057 return ICEDiag(2, E->getLocStart()); 2058} 2059 2060bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 2061 SourceLocation *Loc, bool isEvaluated) const { 2062 ICEDiag d = CheckICE(this, Ctx); 2063 if (d.Val != 0) { 2064 if (Loc) *Loc = d.Loc; 2065 return false; 2066 } 2067 EvalResult EvalResult; 2068 if (!Evaluate(EvalResult, Ctx)) 2069 llvm_unreachable("ICE cannot be evaluated!"); 2070 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 2071 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 2072 Result = EvalResult.Val.getInt(); 2073 return true; 2074} 2075 2076/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2077/// integer constant expression with the value zero, or if this is one that is 2078/// cast to void*. 2079bool Expr::isNullPointerConstant(ASTContext &Ctx, 2080 NullPointerConstantValueDependence NPC) const { 2081 if (isValueDependent()) { 2082 switch (NPC) { 2083 case NPC_NeverValueDependent: 2084 assert(false && "Unexpected value dependent expression!"); 2085 // If the unthinkable happens, fall through to the safest alternative. 2086 2087 case NPC_ValueDependentIsNull: 2088 return isTypeDependent() || getType()->isIntegralType(); 2089 2090 case NPC_ValueDependentIsNotNull: 2091 return false; 2092 } 2093 } 2094 2095 // Strip off a cast to void*, if it exists. Except in C++. 2096 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2097 if (!Ctx.getLangOptions().CPlusPlus) { 2098 // Check that it is a cast to void*. 2099 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2100 QualType Pointee = PT->getPointeeType(); 2101 if (!Pointee.hasQualifiers() && 2102 Pointee->isVoidType() && // to void* 2103 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2104 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2105 } 2106 } 2107 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2108 // Ignore the ImplicitCastExpr type entirely. 2109 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2110 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2111 // Accept ((void*)0) as a null pointer constant, as many other 2112 // implementations do. 2113 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2114 } else if (const CXXDefaultArgExpr *DefaultArg 2115 = dyn_cast<CXXDefaultArgExpr>(this)) { 2116 // See through default argument expressions 2117 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2118 } else if (isa<GNUNullExpr>(this)) { 2119 // The GNU __null extension is always a null pointer constant. 2120 return true; 2121 } 2122 2123 // C++0x nullptr_t is always a null pointer constant. 2124 if (getType()->isNullPtrType()) 2125 return true; 2126 2127 // This expression must be an integer type. 2128 if (!getType()->isIntegerType() || 2129 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2130 return false; 2131 2132 // If we have an integer constant expression, we need to *evaluate* it and 2133 // test for the value 0. 2134 llvm::APSInt Result; 2135 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2136} 2137 2138FieldDecl *Expr::getBitField() { 2139 Expr *E = this->IgnoreParens(); 2140 2141 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2142 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2143 E = ICE->getSubExpr()->IgnoreParens(); 2144 else 2145 break; 2146 } 2147 2148 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2149 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2150 if (Field->isBitField()) 2151 return Field; 2152 2153 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2154 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2155 return BinOp->getLHS()->getBitField(); 2156 2157 return 0; 2158} 2159 2160bool Expr::refersToVectorElement() const { 2161 const Expr *E = this->IgnoreParens(); 2162 2163 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2164 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2165 E = ICE->getSubExpr()->IgnoreParens(); 2166 else 2167 break; 2168 } 2169 2170 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2171 return ASE->getBase()->getType()->isVectorType(); 2172 2173 if (isa<ExtVectorElementExpr>(E)) 2174 return true; 2175 2176 return false; 2177} 2178 2179/// isArrow - Return true if the base expression is a pointer to vector, 2180/// return false if the base expression is a vector. 2181bool ExtVectorElementExpr::isArrow() const { 2182 return getBase()->getType()->isPointerType(); 2183} 2184 2185unsigned ExtVectorElementExpr::getNumElements() const { 2186 if (const VectorType *VT = getType()->getAs<VectorType>()) 2187 return VT->getNumElements(); 2188 return 1; 2189} 2190 2191/// containsDuplicateElements - Return true if any element access is repeated. 2192bool ExtVectorElementExpr::containsDuplicateElements() const { 2193 // FIXME: Refactor this code to an accessor on the AST node which returns the 2194 // "type" of component access, and share with code below and in Sema. 2195 llvm::StringRef Comp = Accessor->getName(); 2196 2197 // Halving swizzles do not contain duplicate elements. 2198 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2199 return false; 2200 2201 // Advance past s-char prefix on hex swizzles. 2202 if (Comp[0] == 's' || Comp[0] == 'S') 2203 Comp = Comp.substr(1); 2204 2205 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2206 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2207 return true; 2208 2209 return false; 2210} 2211 2212/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2213void ExtVectorElementExpr::getEncodedElementAccess( 2214 llvm::SmallVectorImpl<unsigned> &Elts) const { 2215 llvm::StringRef Comp = Accessor->getName(); 2216 if (Comp[0] == 's' || Comp[0] == 'S') 2217 Comp = Comp.substr(1); 2218 2219 bool isHi = Comp == "hi"; 2220 bool isLo = Comp == "lo"; 2221 bool isEven = Comp == "even"; 2222 bool isOdd = Comp == "odd"; 2223 2224 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2225 uint64_t Index; 2226 2227 if (isHi) 2228 Index = e + i; 2229 else if (isLo) 2230 Index = i; 2231 else if (isEven) 2232 Index = 2 * i; 2233 else if (isOdd) 2234 Index = 2 * i + 1; 2235 else 2236 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2237 2238 Elts.push_back(Index); 2239 } 2240} 2241 2242// constructor for instance messages. 2243ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, Expr *receiver, 2244 Selector selInfo, 2245 QualType retType, ObjCMethodDecl *mproto, 2246 SourceLocation LBrac, SourceLocation RBrac, 2247 Expr **ArgExprs, unsigned nargs) 2248 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2249 MethodProto(mproto) { 2250 NumArgs = nargs; 2251 SubExprs = new (C) Stmt*[NumArgs+1]; 2252 SubExprs[RECEIVER] = receiver; 2253 if (NumArgs) { 2254 for (unsigned i = 0; i != NumArgs; ++i) 2255 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2256 } 2257 LBracloc = LBrac; 2258 RBracloc = RBrac; 2259} 2260 2261// constructor for class messages. 2262// FIXME: clsName should be typed to ObjCInterfaceType 2263ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, IdentifierInfo *clsName, 2264 SourceLocation clsNameLoc, Selector selInfo, 2265 QualType retType, ObjCMethodDecl *mproto, 2266 SourceLocation LBrac, SourceLocation RBrac, 2267 Expr **ArgExprs, unsigned nargs) 2268 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc), 2269 SelName(selInfo), MethodProto(mproto) { 2270 NumArgs = nargs; 2271 SubExprs = new (C) Stmt*[NumArgs+1]; 2272 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2273 if (NumArgs) { 2274 for (unsigned i = 0; i != NumArgs; ++i) 2275 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2276 } 2277 LBracloc = LBrac; 2278 RBracloc = RBrac; 2279} 2280 2281// constructor for class messages. 2282ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, ObjCInterfaceDecl *cls, 2283 SourceLocation clsNameLoc, Selector selInfo, 2284 QualType retType, 2285 ObjCMethodDecl *mproto, SourceLocation LBrac, 2286 SourceLocation RBrac, Expr **ArgExprs, 2287 unsigned nargs) 2288 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc), 2289 SelName(selInfo), MethodProto(mproto) 2290{ 2291 NumArgs = nargs; 2292 SubExprs = new (C) Stmt*[NumArgs+1]; 2293 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2294 if (NumArgs) { 2295 for (unsigned i = 0; i != NumArgs; ++i) 2296 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2297 } 2298 LBracloc = LBrac; 2299 RBracloc = RBrac; 2300} 2301 2302ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2303 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2304 switch (x & Flags) { 2305 default: 2306 assert(false && "Invalid ObjCMessageExpr."); 2307 case IsInstMeth: 2308 return ClassInfo(0, 0, SourceLocation()); 2309 case IsClsMethDeclUnknown: 2310 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags), ClassNameLoc); 2311 case IsClsMethDeclKnown: { 2312 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2313 return ClassInfo(D, D->getIdentifier(), ClassNameLoc); 2314 } 2315 } 2316} 2317 2318void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2319 if (CI.Decl == 0 && CI.Name == 0) { 2320 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2321 return; 2322 } 2323 2324 if (CI.Decl == 0) 2325 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Name | IsClsMethDeclUnknown); 2326 else 2327 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Decl | IsClsMethDeclKnown); 2328 ClassNameLoc = CI.Loc; 2329} 2330 2331void ObjCMessageExpr::DoDestroy(ASTContext &C) { 2332 DestroyChildren(C); 2333 if (SubExprs) 2334 C.Deallocate(SubExprs); 2335 this->~ObjCMessageExpr(); 2336 C.Deallocate((void*) this); 2337} 2338 2339bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2340 return getCond()->EvaluateAsInt(C) != 0; 2341} 2342 2343void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2344 unsigned NumExprs) { 2345 if (SubExprs) C.Deallocate(SubExprs); 2346 2347 SubExprs = new (C) Stmt* [NumExprs]; 2348 this->NumExprs = NumExprs; 2349 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2350} 2351 2352void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2353 DestroyChildren(C); 2354 if (SubExprs) C.Deallocate(SubExprs); 2355 this->~ShuffleVectorExpr(); 2356 C.Deallocate(this); 2357} 2358 2359void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2360 // Override default behavior of traversing children. If this has a type 2361 // operand and the type is a variable-length array, the child iteration 2362 // will iterate over the size expression. However, this expression belongs 2363 // to the type, not to this, so we don't want to delete it. 2364 // We still want to delete this expression. 2365 if (isArgumentType()) { 2366 this->~SizeOfAlignOfExpr(); 2367 C.Deallocate(this); 2368 } 2369 else 2370 Expr::DoDestroy(C); 2371} 2372 2373//===----------------------------------------------------------------------===// 2374// DesignatedInitExpr 2375//===----------------------------------------------------------------------===// 2376 2377IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2378 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2379 if (Field.NameOrField & 0x01) 2380 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2381 else 2382 return getField()->getIdentifier(); 2383} 2384 2385DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2386 unsigned NumDesignators, 2387 const Designator *Designators, 2388 SourceLocation EqualOrColonLoc, 2389 bool GNUSyntax, 2390 Expr **IndexExprs, 2391 unsigned NumIndexExprs, 2392 Expr *Init) 2393 : Expr(DesignatedInitExprClass, Ty, 2394 Init->isTypeDependent(), Init->isValueDependent()), 2395 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2396 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2397 this->Designators = new (C) Designator[NumDesignators]; 2398 2399 // Record the initializer itself. 2400 child_iterator Child = child_begin(); 2401 *Child++ = Init; 2402 2403 // Copy the designators and their subexpressions, computing 2404 // value-dependence along the way. 2405 unsigned IndexIdx = 0; 2406 for (unsigned I = 0; I != NumDesignators; ++I) { 2407 this->Designators[I] = Designators[I]; 2408 2409 if (this->Designators[I].isArrayDesignator()) { 2410 // Compute type- and value-dependence. 2411 Expr *Index = IndexExprs[IndexIdx]; 2412 ValueDependent = ValueDependent || 2413 Index->isTypeDependent() || Index->isValueDependent(); 2414 2415 // Copy the index expressions into permanent storage. 2416 *Child++ = IndexExprs[IndexIdx++]; 2417 } else if (this->Designators[I].isArrayRangeDesignator()) { 2418 // Compute type- and value-dependence. 2419 Expr *Start = IndexExprs[IndexIdx]; 2420 Expr *End = IndexExprs[IndexIdx + 1]; 2421 ValueDependent = ValueDependent || 2422 Start->isTypeDependent() || Start->isValueDependent() || 2423 End->isTypeDependent() || End->isValueDependent(); 2424 2425 // Copy the start/end expressions into permanent storage. 2426 *Child++ = IndexExprs[IndexIdx++]; 2427 *Child++ = IndexExprs[IndexIdx++]; 2428 } 2429 } 2430 2431 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2432} 2433 2434DesignatedInitExpr * 2435DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2436 unsigned NumDesignators, 2437 Expr **IndexExprs, unsigned NumIndexExprs, 2438 SourceLocation ColonOrEqualLoc, 2439 bool UsesColonSyntax, Expr *Init) { 2440 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2441 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2442 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2443 ColonOrEqualLoc, UsesColonSyntax, 2444 IndexExprs, NumIndexExprs, Init); 2445} 2446 2447DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2448 unsigned NumIndexExprs) { 2449 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2450 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2451 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2452} 2453 2454void DesignatedInitExpr::setDesignators(ASTContext &C, 2455 const Designator *Desigs, 2456 unsigned NumDesigs) { 2457 DestroyDesignators(C); 2458 2459 Designators = new (C) Designator[NumDesigs]; 2460 NumDesignators = NumDesigs; 2461 for (unsigned I = 0; I != NumDesigs; ++I) 2462 Designators[I] = Desigs[I]; 2463} 2464 2465SourceRange DesignatedInitExpr::getSourceRange() const { 2466 SourceLocation StartLoc; 2467 Designator &First = 2468 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2469 if (First.isFieldDesignator()) { 2470 if (GNUSyntax) 2471 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2472 else 2473 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2474 } else 2475 StartLoc = 2476 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2477 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2478} 2479 2480Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2481 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2482 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2483 Ptr += sizeof(DesignatedInitExpr); 2484 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2485 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2486} 2487 2488Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2489 assert(D.Kind == Designator::ArrayRangeDesignator && 2490 "Requires array range designator"); 2491 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2492 Ptr += sizeof(DesignatedInitExpr); 2493 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2494 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2495} 2496 2497Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2498 assert(D.Kind == Designator::ArrayRangeDesignator && 2499 "Requires array range designator"); 2500 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2501 Ptr += sizeof(DesignatedInitExpr); 2502 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2503 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2504} 2505 2506/// \brief Replaces the designator at index @p Idx with the series 2507/// of designators in [First, Last). 2508void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2509 const Designator *First, 2510 const Designator *Last) { 2511 unsigned NumNewDesignators = Last - First; 2512 if (NumNewDesignators == 0) { 2513 std::copy_backward(Designators + Idx + 1, 2514 Designators + NumDesignators, 2515 Designators + Idx); 2516 --NumNewDesignators; 2517 return; 2518 } else if (NumNewDesignators == 1) { 2519 Designators[Idx] = *First; 2520 return; 2521 } 2522 2523 Designator *NewDesignators 2524 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2525 std::copy(Designators, Designators + Idx, NewDesignators); 2526 std::copy(First, Last, NewDesignators + Idx); 2527 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2528 NewDesignators + Idx + NumNewDesignators); 2529 DestroyDesignators(C); 2530 Designators = NewDesignators; 2531 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2532} 2533 2534void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2535 DestroyDesignators(C); 2536 Expr::DoDestroy(C); 2537} 2538 2539void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2540 for (unsigned I = 0; I != NumDesignators; ++I) 2541 Designators[I].~Designator(); 2542 C.Deallocate(Designators); 2543 Designators = 0; 2544} 2545 2546ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2547 Expr **exprs, unsigned nexprs, 2548 SourceLocation rparenloc) 2549: Expr(ParenListExprClass, QualType(), 2550 hasAnyTypeDependentArguments(exprs, nexprs), 2551 hasAnyValueDependentArguments(exprs, nexprs)), 2552 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2553 2554 Exprs = new (C) Stmt*[nexprs]; 2555 for (unsigned i = 0; i != nexprs; ++i) 2556 Exprs[i] = exprs[i]; 2557} 2558 2559void ParenListExpr::DoDestroy(ASTContext& C) { 2560 DestroyChildren(C); 2561 if (Exprs) C.Deallocate(Exprs); 2562 this->~ParenListExpr(); 2563 C.Deallocate(this); 2564} 2565 2566//===----------------------------------------------------------------------===// 2567// ExprIterator. 2568//===----------------------------------------------------------------------===// 2569 2570Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2571Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2572Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2573const Expr* ConstExprIterator::operator[](size_t idx) const { 2574 return cast<Expr>(I[idx]); 2575} 2576const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2577const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2578 2579//===----------------------------------------------------------------------===// 2580// Child Iterators for iterating over subexpressions/substatements 2581//===----------------------------------------------------------------------===// 2582 2583// DeclRefExpr 2584Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2585Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2586 2587// ObjCIvarRefExpr 2588Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2589Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2590 2591// ObjCPropertyRefExpr 2592Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2593Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2594 2595// ObjCImplicitSetterGetterRefExpr 2596Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2597 return &Base; 2598} 2599Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2600 return &Base+1; 2601} 2602 2603// ObjCSuperExpr 2604Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2605Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2606 2607// ObjCIsaExpr 2608Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2609Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2610 2611// PredefinedExpr 2612Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2613Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2614 2615// IntegerLiteral 2616Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2617Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2618 2619// CharacterLiteral 2620Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2621Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2622 2623// FloatingLiteral 2624Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2625Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2626 2627// ImaginaryLiteral 2628Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2629Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2630 2631// StringLiteral 2632Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2633Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2634 2635// ParenExpr 2636Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2637Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2638 2639// UnaryOperator 2640Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2641Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2642 2643// SizeOfAlignOfExpr 2644Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2645 // If this is of a type and the type is a VLA type (and not a typedef), the 2646 // size expression of the VLA needs to be treated as an executable expression. 2647 // Why isn't this weirdness documented better in StmtIterator? 2648 if (isArgumentType()) { 2649 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2650 getArgumentType().getTypePtr())) 2651 return child_iterator(T); 2652 return child_iterator(); 2653 } 2654 return child_iterator(&Argument.Ex); 2655} 2656Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2657 if (isArgumentType()) 2658 return child_iterator(); 2659 return child_iterator(&Argument.Ex + 1); 2660} 2661 2662// ArraySubscriptExpr 2663Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2664 return &SubExprs[0]; 2665} 2666Stmt::child_iterator ArraySubscriptExpr::child_end() { 2667 return &SubExprs[0]+END_EXPR; 2668} 2669 2670// CallExpr 2671Stmt::child_iterator CallExpr::child_begin() { 2672 return &SubExprs[0]; 2673} 2674Stmt::child_iterator CallExpr::child_end() { 2675 return &SubExprs[0]+NumArgs+ARGS_START; 2676} 2677 2678// MemberExpr 2679Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2680Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2681 2682// ExtVectorElementExpr 2683Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2684Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2685 2686// CompoundLiteralExpr 2687Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2688Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2689 2690// CastExpr 2691Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2692Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2693 2694// BinaryOperator 2695Stmt::child_iterator BinaryOperator::child_begin() { 2696 return &SubExprs[0]; 2697} 2698Stmt::child_iterator BinaryOperator::child_end() { 2699 return &SubExprs[0]+END_EXPR; 2700} 2701 2702// ConditionalOperator 2703Stmt::child_iterator ConditionalOperator::child_begin() { 2704 return &SubExprs[0]; 2705} 2706Stmt::child_iterator ConditionalOperator::child_end() { 2707 return &SubExprs[0]+END_EXPR; 2708} 2709 2710// AddrLabelExpr 2711Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2712Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2713 2714// StmtExpr 2715Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2716Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2717 2718// TypesCompatibleExpr 2719Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2720 return child_iterator(); 2721} 2722 2723Stmt::child_iterator TypesCompatibleExpr::child_end() { 2724 return child_iterator(); 2725} 2726 2727// ChooseExpr 2728Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2729Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2730 2731// GNUNullExpr 2732Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2733Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2734 2735// ShuffleVectorExpr 2736Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2737 return &SubExprs[0]; 2738} 2739Stmt::child_iterator ShuffleVectorExpr::child_end() { 2740 return &SubExprs[0]+NumExprs; 2741} 2742 2743// VAArgExpr 2744Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2745Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2746 2747// InitListExpr 2748Stmt::child_iterator InitListExpr::child_begin() { 2749 return InitExprs.size() ? &InitExprs[0] : 0; 2750} 2751Stmt::child_iterator InitListExpr::child_end() { 2752 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2753} 2754 2755// DesignatedInitExpr 2756Stmt::child_iterator DesignatedInitExpr::child_begin() { 2757 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2758 Ptr += sizeof(DesignatedInitExpr); 2759 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2760} 2761Stmt::child_iterator DesignatedInitExpr::child_end() { 2762 return child_iterator(&*child_begin() + NumSubExprs); 2763} 2764 2765// ImplicitValueInitExpr 2766Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2767 return child_iterator(); 2768} 2769 2770Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2771 return child_iterator(); 2772} 2773 2774// ParenListExpr 2775Stmt::child_iterator ParenListExpr::child_begin() { 2776 return &Exprs[0]; 2777} 2778Stmt::child_iterator ParenListExpr::child_end() { 2779 return &Exprs[0]+NumExprs; 2780} 2781 2782// ObjCStringLiteral 2783Stmt::child_iterator ObjCStringLiteral::child_begin() { 2784 return &String; 2785} 2786Stmt::child_iterator ObjCStringLiteral::child_end() { 2787 return &String+1; 2788} 2789 2790// ObjCEncodeExpr 2791Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2792Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2793 2794// ObjCSelectorExpr 2795Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2796 return child_iterator(); 2797} 2798Stmt::child_iterator ObjCSelectorExpr::child_end() { 2799 return child_iterator(); 2800} 2801 2802// ObjCProtocolExpr 2803Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2804 return child_iterator(); 2805} 2806Stmt::child_iterator ObjCProtocolExpr::child_end() { 2807 return child_iterator(); 2808} 2809 2810// ObjCMessageExpr 2811Stmt::child_iterator ObjCMessageExpr::child_begin() { 2812 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2813} 2814Stmt::child_iterator ObjCMessageExpr::child_end() { 2815 return &SubExprs[0]+ARGS_START+getNumArgs(); 2816} 2817 2818// Blocks 2819Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2820Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2821 2822Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2823Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2824