Expr.cpp revision a3bddeda81ca784bed5501d79e1e7c53befaa91d
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 655void CastExpr::DoDestroy(ASTContext &C) 656{ 657 if (InheritancePath) 658 InheritancePath->Destroy(); 659 Expr::DoDestroy(C); 660} 661 662Expr *CastExpr::getSubExprAsWritten() { 663 Expr *SubExpr = 0; 664 CastExpr *E = this; 665 do { 666 SubExpr = E->getSubExpr(); 667 668 // Skip any temporary bindings; they're implicit. 669 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 670 SubExpr = Binder->getSubExpr(); 671 672 // Conversions by constructor and conversion functions have a 673 // subexpression describing the call; strip it off. 674 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 675 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 676 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 677 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 678 679 // If the subexpression we're left with is an implicit cast, look 680 // through that, too. 681 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 682 683 return SubExpr; 684} 685 686/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 687/// corresponds to, e.g. "<<=". 688const char *BinaryOperator::getOpcodeStr(Opcode Op) { 689 switch (Op) { 690 case PtrMemD: return ".*"; 691 case PtrMemI: return "->*"; 692 case Mul: return "*"; 693 case Div: return "/"; 694 case Rem: return "%"; 695 case Add: return "+"; 696 case Sub: return "-"; 697 case Shl: return "<<"; 698 case Shr: return ">>"; 699 case LT: return "<"; 700 case GT: return ">"; 701 case LE: return "<="; 702 case GE: return ">="; 703 case EQ: return "=="; 704 case NE: return "!="; 705 case And: return "&"; 706 case Xor: return "^"; 707 case Or: return "|"; 708 case LAnd: return "&&"; 709 case LOr: return "||"; 710 case Assign: return "="; 711 case MulAssign: return "*="; 712 case DivAssign: return "/="; 713 case RemAssign: return "%="; 714 case AddAssign: return "+="; 715 case SubAssign: return "-="; 716 case ShlAssign: return "<<="; 717 case ShrAssign: return ">>="; 718 case AndAssign: return "&="; 719 case XorAssign: return "^="; 720 case OrAssign: return "|="; 721 case Comma: return ","; 722 } 723 724 return ""; 725} 726 727BinaryOperator::Opcode 728BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 729 switch (OO) { 730 default: assert(false && "Not an overloadable binary operator"); 731 case OO_Plus: return Add; 732 case OO_Minus: return Sub; 733 case OO_Star: return Mul; 734 case OO_Slash: return Div; 735 case OO_Percent: return Rem; 736 case OO_Caret: return Xor; 737 case OO_Amp: return And; 738 case OO_Pipe: return Or; 739 case OO_Equal: return Assign; 740 case OO_Less: return LT; 741 case OO_Greater: return GT; 742 case OO_PlusEqual: return AddAssign; 743 case OO_MinusEqual: return SubAssign; 744 case OO_StarEqual: return MulAssign; 745 case OO_SlashEqual: return DivAssign; 746 case OO_PercentEqual: return RemAssign; 747 case OO_CaretEqual: return XorAssign; 748 case OO_AmpEqual: return AndAssign; 749 case OO_PipeEqual: return OrAssign; 750 case OO_LessLess: return Shl; 751 case OO_GreaterGreater: return Shr; 752 case OO_LessLessEqual: return ShlAssign; 753 case OO_GreaterGreaterEqual: return ShrAssign; 754 case OO_EqualEqual: return EQ; 755 case OO_ExclaimEqual: return NE; 756 case OO_LessEqual: return LE; 757 case OO_GreaterEqual: return GE; 758 case OO_AmpAmp: return LAnd; 759 case OO_PipePipe: return LOr; 760 case OO_Comma: return Comma; 761 case OO_ArrowStar: return PtrMemI; 762 } 763} 764 765OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 766 static const OverloadedOperatorKind OverOps[] = { 767 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 768 OO_Star, OO_Slash, OO_Percent, 769 OO_Plus, OO_Minus, 770 OO_LessLess, OO_GreaterGreater, 771 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 772 OO_EqualEqual, OO_ExclaimEqual, 773 OO_Amp, 774 OO_Caret, 775 OO_Pipe, 776 OO_AmpAmp, 777 OO_PipePipe, 778 OO_Equal, OO_StarEqual, 779 OO_SlashEqual, OO_PercentEqual, 780 OO_PlusEqual, OO_MinusEqual, 781 OO_LessLessEqual, OO_GreaterGreaterEqual, 782 OO_AmpEqual, OO_CaretEqual, 783 OO_PipeEqual, 784 OO_Comma 785 }; 786 return OverOps[Opc]; 787} 788 789InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 790 Expr **initExprs, unsigned numInits, 791 SourceLocation rbraceloc) 792 : Expr(InitListExprClass, QualType(), false, false), 793 InitExprs(C, numInits), 794 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 795 UnionFieldInit(0), HadArrayRangeDesignator(false) 796{ 797 for (unsigned I = 0; I != numInits; ++I) { 798 if (initExprs[I]->isTypeDependent()) 799 TypeDependent = true; 800 if (initExprs[I]->isValueDependent()) 801 ValueDependent = true; 802 } 803 804 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 805} 806 807void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 808 if (NumInits > InitExprs.size()) 809 InitExprs.reserve(C, NumInits); 810} 811 812void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 813 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 814 Idx < LastIdx; ++Idx) 815 InitExprs[Idx]->Destroy(C); 816 InitExprs.resize(C, NumInits, 0); 817} 818 819Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 820 if (Init >= InitExprs.size()) { 821 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 822 InitExprs.back() = expr; 823 return 0; 824 } 825 826 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 827 InitExprs[Init] = expr; 828 return Result; 829} 830 831/// getFunctionType - Return the underlying function type for this block. 832/// 833const FunctionType *BlockExpr::getFunctionType() const { 834 return getType()->getAs<BlockPointerType>()-> 835 getPointeeType()->getAs<FunctionType>(); 836} 837 838SourceLocation BlockExpr::getCaretLocation() const { 839 return TheBlock->getCaretLocation(); 840} 841const Stmt *BlockExpr::getBody() const { 842 return TheBlock->getBody(); 843} 844Stmt *BlockExpr::getBody() { 845 return TheBlock->getBody(); 846} 847 848 849//===----------------------------------------------------------------------===// 850// Generic Expression Routines 851//===----------------------------------------------------------------------===// 852 853/// isUnusedResultAWarning - Return true if this immediate expression should 854/// be warned about if the result is unused. If so, fill in Loc and Ranges 855/// with location to warn on and the source range[s] to report with the 856/// warning. 857bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 858 SourceRange &R2, ASTContext &Ctx) const { 859 // Don't warn if the expr is type dependent. The type could end up 860 // instantiating to void. 861 if (isTypeDependent()) 862 return false; 863 864 switch (getStmtClass()) { 865 default: 866 if (getType()->isVoidType()) 867 return false; 868 Loc = getExprLoc(); 869 R1 = getSourceRange(); 870 return true; 871 case ParenExprClass: 872 return cast<ParenExpr>(this)->getSubExpr()-> 873 isUnusedResultAWarning(Loc, R1, R2, Ctx); 874 case UnaryOperatorClass: { 875 const UnaryOperator *UO = cast<UnaryOperator>(this); 876 877 switch (UO->getOpcode()) { 878 default: break; 879 case UnaryOperator::PostInc: 880 case UnaryOperator::PostDec: 881 case UnaryOperator::PreInc: 882 case UnaryOperator::PreDec: // ++/-- 883 return false; // Not a warning. 884 case UnaryOperator::Deref: 885 // Dereferencing a volatile pointer is a side-effect. 886 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 887 return false; 888 break; 889 case UnaryOperator::Real: 890 case UnaryOperator::Imag: 891 // accessing a piece of a volatile complex is a side-effect. 892 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 893 .isVolatileQualified()) 894 return false; 895 break; 896 case UnaryOperator::Extension: 897 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 898 } 899 Loc = UO->getOperatorLoc(); 900 R1 = UO->getSubExpr()->getSourceRange(); 901 return true; 902 } 903 case BinaryOperatorClass: { 904 const BinaryOperator *BO = cast<BinaryOperator>(this); 905 switch (BO->getOpcode()) { 906 default: 907 break; 908 // Consider ',', '||', '&&' to have side effects if the LHS or RHS does. 909 case BinaryOperator::Comma: 910 // ((foo = <blah>), 0) is an idiom for hiding the result (and 911 // lvalue-ness) of an assignment written in a macro. 912 if (IntegerLiteral *IE = 913 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 914 if (IE->getValue() == 0) 915 return false; 916 case BinaryOperator::LAnd: 917 case BinaryOperator::LOr: 918 return (BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 919 BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 920 } 921 if (BO->isAssignmentOp()) 922 return false; 923 Loc = BO->getOperatorLoc(); 924 R1 = BO->getLHS()->getSourceRange(); 925 R2 = BO->getRHS()->getSourceRange(); 926 return true; 927 } 928 case CompoundAssignOperatorClass: 929 return false; 930 931 case ConditionalOperatorClass: { 932 // The condition must be evaluated, but if either the LHS or RHS is a 933 // warning, warn about them. 934 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 935 if (Exp->getLHS() && 936 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 937 return true; 938 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 939 } 940 941 case MemberExprClass: 942 // If the base pointer or element is to a volatile pointer/field, accessing 943 // it is a side effect. 944 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 945 return false; 946 Loc = cast<MemberExpr>(this)->getMemberLoc(); 947 R1 = SourceRange(Loc, Loc); 948 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 949 return true; 950 951 case ArraySubscriptExprClass: 952 // If the base pointer or element is to a volatile pointer/field, accessing 953 // it is a side effect. 954 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 955 return false; 956 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 957 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 958 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 959 return true; 960 961 case CallExprClass: 962 case CXXOperatorCallExprClass: 963 case CXXMemberCallExprClass: { 964 // If this is a direct call, get the callee. 965 const CallExpr *CE = cast<CallExpr>(this); 966 if (const Decl *FD = CE->getCalleeDecl()) { 967 // If the callee has attribute pure, const, or warn_unused_result, warn 968 // about it. void foo() { strlen("bar"); } should warn. 969 // 970 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 971 // updated to match for QoI. 972 if (FD->getAttr<WarnUnusedResultAttr>() || 973 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 974 Loc = CE->getCallee()->getLocStart(); 975 R1 = CE->getCallee()->getSourceRange(); 976 977 if (unsigned NumArgs = CE->getNumArgs()) 978 R2 = SourceRange(CE->getArg(0)->getLocStart(), 979 CE->getArg(NumArgs-1)->getLocEnd()); 980 return true; 981 } 982 } 983 return false; 984 } 985 986 case CXXTemporaryObjectExprClass: 987 case CXXConstructExprClass: 988 return false; 989 990 case ObjCMessageExprClass: { 991 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 992 const ObjCMethodDecl *MD = ME->getMethodDecl(); 993 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 994 Loc = getExprLoc(); 995 return true; 996 } 997 return false; 998 } 999 1000 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 1001#if 0 1002 const ObjCImplicitSetterGetterRefExpr *Ref = 1003 cast<ObjCImplicitSetterGetterRefExpr>(this); 1004 // FIXME: We really want the location of the '.' here. 1005 Loc = Ref->getLocation(); 1006 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 1007 if (Ref->getBase()) 1008 R2 = Ref->getBase()->getSourceRange(); 1009#else 1010 Loc = getExprLoc(); 1011 R1 = getSourceRange(); 1012#endif 1013 return true; 1014 } 1015 case StmtExprClass: { 1016 // Statement exprs don't logically have side effects themselves, but are 1017 // sometimes used in macros in ways that give them a type that is unused. 1018 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1019 // however, if the result of the stmt expr is dead, we don't want to emit a 1020 // warning. 1021 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1022 if (!CS->body_empty()) 1023 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1024 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1025 1026 if (getType()->isVoidType()) 1027 return false; 1028 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1029 R1 = getSourceRange(); 1030 return true; 1031 } 1032 case CStyleCastExprClass: 1033 // If this is an explicit cast to void, allow it. People do this when they 1034 // think they know what they're doing :). 1035 if (getType()->isVoidType()) 1036 return false; 1037 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1038 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1039 return true; 1040 case CXXFunctionalCastExprClass: { 1041 if (getType()->isVoidType()) 1042 return false; 1043 const CastExpr *CE = cast<CastExpr>(this); 1044 1045 // If this is a cast to void or a constructor conversion, check the operand. 1046 // Otherwise, the result of the cast is unused. 1047 if (CE->getCastKind() == CastExpr::CK_ToVoid || 1048 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 1049 return (cast<CastExpr>(this)->getSubExpr() 1050 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1051 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1052 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1053 return true; 1054 } 1055 1056 case ImplicitCastExprClass: 1057 // Check the operand, since implicit casts are inserted by Sema 1058 return (cast<ImplicitCastExpr>(this) 1059 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1060 1061 case CXXDefaultArgExprClass: 1062 return (cast<CXXDefaultArgExpr>(this) 1063 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1064 1065 case CXXNewExprClass: 1066 // FIXME: In theory, there might be new expressions that don't have side 1067 // effects (e.g. a placement new with an uninitialized POD). 1068 case CXXDeleteExprClass: 1069 return false; 1070 case CXXBindTemporaryExprClass: 1071 return (cast<CXXBindTemporaryExpr>(this) 1072 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1073 case CXXExprWithTemporariesClass: 1074 return (cast<CXXExprWithTemporaries>(this) 1075 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1076 } 1077} 1078 1079/// DeclCanBeLvalue - Determine whether the given declaration can be 1080/// an lvalue. This is a helper routine for isLvalue. 1081static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 1082 // C++ [temp.param]p6: 1083 // A non-type non-reference template-parameter is not an lvalue. 1084 if (const NonTypeTemplateParmDecl *NTTParm 1085 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 1086 return NTTParm->getType()->isReferenceType(); 1087 1088 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 1089 // C++ 3.10p2: An lvalue refers to an object or function. 1090 (Ctx.getLangOptions().CPlusPlus && 1091 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 1092} 1093 1094/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 1095/// incomplete type other than void. Nonarray expressions that can be lvalues: 1096/// - name, where name must be a variable 1097/// - e[i] 1098/// - (e), where e must be an lvalue 1099/// - e.name, where e must be an lvalue 1100/// - e->name 1101/// - *e, the type of e cannot be a function type 1102/// - string-constant 1103/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1104/// - reference type [C++ [expr]] 1105/// 1106Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1107 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1108 1109 isLvalueResult Res = isLvalueInternal(Ctx); 1110 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1111 return Res; 1112 1113 // first, check the type (C99 6.3.2.1). Expressions with function 1114 // type in C are not lvalues, but they can be lvalues in C++. 1115 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1116 return LV_NotObjectType; 1117 1118 // Allow qualified void which is an incomplete type other than void (yuck). 1119 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1120 return LV_IncompleteVoidType; 1121 1122 return LV_Valid; 1123} 1124 1125// Check whether the expression can be sanely treated like an l-value 1126Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1127 switch (getStmtClass()) { 1128 case ObjCIsaExprClass: 1129 case StringLiteralClass: // C99 6.5.1p4 1130 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1131 return LV_Valid; 1132 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1133 // For vectors, make sure base is an lvalue (i.e. not a function call). 1134 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1135 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1136 return LV_Valid; 1137 case DeclRefExprClass: { // C99 6.5.1p2 1138 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1139 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1140 return LV_Valid; 1141 break; 1142 } 1143 case BlockDeclRefExprClass: { 1144 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1145 if (isa<VarDecl>(BDR->getDecl())) 1146 return LV_Valid; 1147 break; 1148 } 1149 case MemberExprClass: { 1150 const MemberExpr *m = cast<MemberExpr>(this); 1151 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1152 NamedDecl *Member = m->getMemberDecl(); 1153 // C++ [expr.ref]p4: 1154 // If E2 is declared to have type "reference to T", then E1.E2 1155 // is an lvalue. 1156 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1157 if (Value->getType()->isReferenceType()) 1158 return LV_Valid; 1159 1160 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1161 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1162 return LV_Valid; 1163 1164 // -- If E2 is a non-static data member [...]. If E1 is an 1165 // lvalue, then E1.E2 is an lvalue. 1166 if (isa<FieldDecl>(Member)) { 1167 if (m->isArrow()) 1168 return LV_Valid; 1169 return m->getBase()->isLvalue(Ctx); 1170 } 1171 1172 // -- If it refers to a static member function [...], then 1173 // E1.E2 is an lvalue. 1174 // -- Otherwise, if E1.E2 refers to a non-static member 1175 // function [...], then E1.E2 is not an lvalue. 1176 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1177 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1178 1179 // -- If E2 is a member enumerator [...], the expression E1.E2 1180 // is not an lvalue. 1181 if (isa<EnumConstantDecl>(Member)) 1182 return LV_InvalidExpression; 1183 1184 // Not an lvalue. 1185 return LV_InvalidExpression; 1186 } 1187 1188 // C99 6.5.2.3p4 1189 if (m->isArrow()) 1190 return LV_Valid; 1191 Expr *BaseExp = m->getBase(); 1192 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass || 1193 BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) 1194 return LV_SubObjCPropertySetting; 1195 return 1196 BaseExp->isLvalue(Ctx); 1197 } 1198 case UnaryOperatorClass: 1199 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1200 return LV_Valid; // C99 6.5.3p4 1201 1202 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1203 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1204 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1205 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1206 1207 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1208 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1209 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1210 return LV_Valid; 1211 break; 1212 case ImplicitCastExprClass: 1213 if (cast<ImplicitCastExpr>(this)->isLvalueCast()) 1214 return LV_Valid; 1215 1216 // If this is a conversion to a class temporary, make a note of 1217 // that. 1218 if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType()) 1219 return LV_ClassTemporary; 1220 1221 break; 1222 case ParenExprClass: // C99 6.5.1p5 1223 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1224 case BinaryOperatorClass: 1225 case CompoundAssignOperatorClass: { 1226 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1227 1228 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1229 BinOp->getOpcode() == BinaryOperator::Comma) 1230 return BinOp->getRHS()->isLvalue(Ctx); 1231 1232 // C++ [expr.mptr.oper]p6 1233 // The result of a .* expression is an lvalue only if its first operand is 1234 // an lvalue and its second operand is a pointer to data member. 1235 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1236 !BinOp->getType()->isFunctionType()) 1237 return BinOp->getLHS()->isLvalue(Ctx); 1238 1239 // The result of an ->* expression is an lvalue only if its second operand 1240 // is a pointer to data member. 1241 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1242 !BinOp->getType()->isFunctionType()) { 1243 QualType Ty = BinOp->getRHS()->getType(); 1244 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1245 return LV_Valid; 1246 } 1247 1248 if (!BinOp->isAssignmentOp()) 1249 return LV_InvalidExpression; 1250 1251 if (Ctx.getLangOptions().CPlusPlus) 1252 // C++ [expr.ass]p1: 1253 // The result of an assignment operation [...] is an lvalue. 1254 return LV_Valid; 1255 1256 1257 // C99 6.5.16: 1258 // An assignment expression [...] is not an lvalue. 1259 return LV_InvalidExpression; 1260 } 1261 case CallExprClass: 1262 case CXXOperatorCallExprClass: 1263 case CXXMemberCallExprClass: { 1264 // C++0x [expr.call]p10 1265 // A function call is an lvalue if and only if the result type 1266 // is an lvalue reference. 1267 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1268 if (ReturnType->isLValueReferenceType()) 1269 return LV_Valid; 1270 1271 // If the function is returning a class temporary, make a note of 1272 // that. 1273 if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType()) 1274 return LV_ClassTemporary; 1275 1276 break; 1277 } 1278 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1279 // FIXME: Is this what we want in C++? 1280 return LV_Valid; 1281 case ChooseExprClass: 1282 // __builtin_choose_expr is an lvalue if the selected operand is. 1283 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1284 case ExtVectorElementExprClass: 1285 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1286 return LV_DuplicateVectorComponents; 1287 return LV_Valid; 1288 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1289 return LV_Valid; 1290 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1291 return LV_Valid; 1292 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1293 return LV_Valid; 1294 case PredefinedExprClass: 1295 return LV_Valid; 1296 case UnresolvedLookupExprClass: 1297 return LV_Valid; 1298 case CXXDefaultArgExprClass: 1299 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1300 case CStyleCastExprClass: 1301 case CXXFunctionalCastExprClass: 1302 case CXXStaticCastExprClass: 1303 case CXXDynamicCastExprClass: 1304 case CXXReinterpretCastExprClass: 1305 case CXXConstCastExprClass: 1306 // The result of an explicit cast is an lvalue if the type we are 1307 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1308 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1309 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1310 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1311 isLValueReferenceType()) 1312 return LV_Valid; 1313 1314 // If this is a conversion to a class temporary, make a note of 1315 // that. 1316 if (Ctx.getLangOptions().CPlusPlus && 1317 cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType()) 1318 return LV_ClassTemporary; 1319 1320 break; 1321 case CXXTypeidExprClass: 1322 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1323 return LV_Valid; 1324 case CXXBindTemporaryExprClass: 1325 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1326 isLvalueInternal(Ctx); 1327 case CXXBindReferenceExprClass: 1328 // Something that's bound to a reference is always an lvalue. 1329 return LV_Valid; 1330 case ConditionalOperatorClass: { 1331 // Complicated handling is only for C++. 1332 if (!Ctx.getLangOptions().CPlusPlus) 1333 return LV_InvalidExpression; 1334 1335 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1336 // everywhere there's an object converted to an rvalue. Also, any other 1337 // casts should be wrapped by ImplicitCastExprs. There's just the special 1338 // case involving throws to work out. 1339 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1340 Expr *True = Cond->getTrueExpr(); 1341 Expr *False = Cond->getFalseExpr(); 1342 // C++0x 5.16p2 1343 // If either the second or the third operand has type (cv) void, [...] 1344 // the result [...] is an rvalue. 1345 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1346 return LV_InvalidExpression; 1347 1348 // Both sides must be lvalues for the result to be an lvalue. 1349 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1350 return LV_InvalidExpression; 1351 1352 // That's it. 1353 return LV_Valid; 1354 } 1355 1356 case Expr::CXXExprWithTemporariesClass: 1357 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1358 1359 case Expr::ObjCMessageExprClass: 1360 if (const ObjCMethodDecl *Method 1361 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1362 if (Method->getResultType()->isLValueReferenceType()) 1363 return LV_Valid; 1364 break; 1365 1366 case Expr::CXXConstructExprClass: 1367 case Expr::CXXTemporaryObjectExprClass: 1368 case Expr::CXXZeroInitValueExprClass: 1369 return LV_ClassTemporary; 1370 1371 default: 1372 break; 1373 } 1374 return LV_InvalidExpression; 1375} 1376 1377/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1378/// does not have an incomplete type, does not have a const-qualified type, and 1379/// if it is a structure or union, does not have any member (including, 1380/// recursively, any member or element of all contained aggregates or unions) 1381/// with a const-qualified type. 1382Expr::isModifiableLvalueResult 1383Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1384 isLvalueResult lvalResult = isLvalue(Ctx); 1385 1386 switch (lvalResult) { 1387 case LV_Valid: 1388 // C++ 3.10p11: Functions cannot be modified, but pointers to 1389 // functions can be modifiable. 1390 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1391 return MLV_NotObjectType; 1392 break; 1393 1394 case LV_NotObjectType: return MLV_NotObjectType; 1395 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1396 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1397 case LV_InvalidExpression: 1398 // If the top level is a C-style cast, and the subexpression is a valid 1399 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1400 // GCC extension. We don't support it, but we want to produce good 1401 // diagnostics when it happens so that the user knows why. 1402 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1403 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1404 if (Loc) 1405 *Loc = CE->getLParenLoc(); 1406 return MLV_LValueCast; 1407 } 1408 } 1409 return MLV_InvalidExpression; 1410 case LV_MemberFunction: return MLV_MemberFunction; 1411 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1412 case LV_ClassTemporary: 1413 return MLV_ClassTemporary; 1414 } 1415 1416 // The following is illegal: 1417 // void takeclosure(void (^C)(void)); 1418 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1419 // 1420 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1421 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1422 return MLV_NotBlockQualified; 1423 } 1424 1425 // Assigning to an 'implicit' property? 1426 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1427 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1428 if (Expr->getSetterMethod() == 0) 1429 return MLV_NoSetterProperty; 1430 } 1431 1432 QualType CT = Ctx.getCanonicalType(getType()); 1433 1434 if (CT.isConstQualified()) 1435 return MLV_ConstQualified; 1436 if (CT->isArrayType()) 1437 return MLV_ArrayType; 1438 if (CT->isIncompleteType()) 1439 return MLV_IncompleteType; 1440 1441 if (const RecordType *r = CT->getAs<RecordType>()) { 1442 if (r->hasConstFields()) 1443 return MLV_ConstQualified; 1444 } 1445 1446 return MLV_Valid; 1447} 1448 1449/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1450/// returns true, if it is; false otherwise. 1451bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1452 switch (getStmtClass()) { 1453 default: 1454 return false; 1455 case ObjCIvarRefExprClass: 1456 return true; 1457 case Expr::UnaryOperatorClass: 1458 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1459 case ParenExprClass: 1460 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1461 case ImplicitCastExprClass: 1462 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1463 case CStyleCastExprClass: 1464 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1465 case DeclRefExprClass: { 1466 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1467 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1468 if (VD->hasGlobalStorage()) 1469 return true; 1470 QualType T = VD->getType(); 1471 // dereferencing to a pointer is always a gc'able candidate, 1472 // unless it is __weak. 1473 return T->isPointerType() && 1474 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1475 } 1476 return false; 1477 } 1478 case MemberExprClass: { 1479 const MemberExpr *M = cast<MemberExpr>(this); 1480 return M->getBase()->isOBJCGCCandidate(Ctx); 1481 } 1482 case ArraySubscriptExprClass: 1483 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1484 } 1485} 1486Expr* Expr::IgnoreParens() { 1487 Expr* E = this; 1488 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1489 E = P->getSubExpr(); 1490 1491 return E; 1492} 1493 1494/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1495/// or CastExprs or ImplicitCastExprs, returning their operand. 1496Expr *Expr::IgnoreParenCasts() { 1497 Expr *E = this; 1498 while (true) { 1499 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1500 E = P->getSubExpr(); 1501 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1502 E = P->getSubExpr(); 1503 else 1504 return E; 1505 } 1506} 1507 1508/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1509/// value (including ptr->int casts of the same size). Strip off any 1510/// ParenExpr or CastExprs, returning their operand. 1511Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1512 Expr *E = this; 1513 while (true) { 1514 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1515 E = P->getSubExpr(); 1516 continue; 1517 } 1518 1519 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1520 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1521 // ptr<->int casts of the same width. We also ignore all identify casts. 1522 Expr *SE = P->getSubExpr(); 1523 1524 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1525 E = SE; 1526 continue; 1527 } 1528 1529 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1530 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1531 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1532 E = SE; 1533 continue; 1534 } 1535 } 1536 1537 return E; 1538 } 1539} 1540 1541bool Expr::isDefaultArgument() const { 1542 const Expr *E = this; 1543 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1544 E = ICE->getSubExprAsWritten(); 1545 1546 return isa<CXXDefaultArgExpr>(E); 1547} 1548 1549/// \brief Skip over any no-op casts and any temporary-binding 1550/// expressions. 1551static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1552 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1553 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1554 E = ICE->getSubExpr(); 1555 else 1556 break; 1557 } 1558 1559 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1560 E = BE->getSubExpr(); 1561 1562 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1563 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1564 E = ICE->getSubExpr(); 1565 else 1566 break; 1567 } 1568 1569 return E; 1570} 1571 1572const Expr *Expr::getTemporaryObject() const { 1573 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1574 1575 // A cast can produce a temporary object. The object's construction 1576 // is represented as a CXXConstructExpr. 1577 if (const CastExpr *Cast = dyn_cast<CastExpr>(E)) { 1578 // Only user-defined and constructor conversions can produce 1579 // temporary objects. 1580 if (Cast->getCastKind() != CastExpr::CK_ConstructorConversion && 1581 Cast->getCastKind() != CastExpr::CK_UserDefinedConversion) 1582 return 0; 1583 1584 // Strip off temporary bindings and no-op casts. 1585 const Expr *Sub = skipTemporaryBindingsAndNoOpCasts(Cast->getSubExpr()); 1586 1587 // If this is a constructor conversion, see if we have an object 1588 // construction. 1589 if (Cast->getCastKind() == CastExpr::CK_ConstructorConversion) 1590 return dyn_cast<CXXConstructExpr>(Sub); 1591 1592 // If this is a user-defined conversion, see if we have a call to 1593 // a function that itself returns a temporary object. 1594 if (Cast->getCastKind() == CastExpr::CK_UserDefinedConversion) 1595 if (const CallExpr *CE = dyn_cast<CallExpr>(Sub)) 1596 if (CE->getCallReturnType()->isRecordType()) 1597 return CE; 1598 1599 return 0; 1600 } 1601 1602 // A call returning a class type returns a temporary. 1603 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1604 if (CE->getCallReturnType()->isRecordType()) 1605 return CE; 1606 1607 return 0; 1608 } 1609 1610 // Explicit temporary object constructors create temporaries. 1611 return dyn_cast<CXXTemporaryObjectExpr>(E); 1612} 1613 1614/// hasAnyTypeDependentArguments - Determines if any of the expressions 1615/// in Exprs is type-dependent. 1616bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1617 for (unsigned I = 0; I < NumExprs; ++I) 1618 if (Exprs[I]->isTypeDependent()) 1619 return true; 1620 1621 return false; 1622} 1623 1624/// hasAnyValueDependentArguments - Determines if any of the expressions 1625/// in Exprs is value-dependent. 1626bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1627 for (unsigned I = 0; I < NumExprs; ++I) 1628 if (Exprs[I]->isValueDependent()) 1629 return true; 1630 1631 return false; 1632} 1633 1634bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1635 // This function is attempting whether an expression is an initializer 1636 // which can be evaluated at compile-time. isEvaluatable handles most 1637 // of the cases, but it can't deal with some initializer-specific 1638 // expressions, and it can't deal with aggregates; we deal with those here, 1639 // and fall back to isEvaluatable for the other cases. 1640 1641 // FIXME: This function assumes the variable being assigned to 1642 // isn't a reference type! 1643 1644 switch (getStmtClass()) { 1645 default: break; 1646 case StringLiteralClass: 1647 case ObjCStringLiteralClass: 1648 case ObjCEncodeExprClass: 1649 return true; 1650 case CompoundLiteralExprClass: { 1651 // This handles gcc's extension that allows global initializers like 1652 // "struct x {int x;} x = (struct x) {};". 1653 // FIXME: This accepts other cases it shouldn't! 1654 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1655 return Exp->isConstantInitializer(Ctx); 1656 } 1657 case InitListExprClass: { 1658 // FIXME: This doesn't deal with fields with reference types correctly. 1659 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1660 // to bitfields. 1661 const InitListExpr *Exp = cast<InitListExpr>(this); 1662 unsigned numInits = Exp->getNumInits(); 1663 for (unsigned i = 0; i < numInits; i++) { 1664 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1665 return false; 1666 } 1667 return true; 1668 } 1669 case ImplicitValueInitExprClass: 1670 return true; 1671 case ParenExprClass: 1672 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1673 case UnaryOperatorClass: { 1674 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1675 if (Exp->getOpcode() == UnaryOperator::Extension) 1676 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1677 break; 1678 } 1679 case BinaryOperatorClass: { 1680 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1681 // but this handles the common case. 1682 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1683 if (Exp->getOpcode() == BinaryOperator::Sub && 1684 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1685 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1686 return true; 1687 break; 1688 } 1689 case ImplicitCastExprClass: 1690 case CStyleCastExprClass: 1691 // Handle casts with a destination that's a struct or union; this 1692 // deals with both the gcc no-op struct cast extension and the 1693 // cast-to-union extension. 1694 if (getType()->isRecordType()) 1695 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1696 1697 // Integer->integer casts can be handled here, which is important for 1698 // things like (int)(&&x-&&y). Scary but true. 1699 if (getType()->isIntegerType() && 1700 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1701 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1702 1703 break; 1704 } 1705 return isEvaluatable(Ctx); 1706} 1707 1708/// isIntegerConstantExpr - this recursive routine will test if an expression is 1709/// an integer constant expression. 1710 1711/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1712/// comma, etc 1713/// 1714/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1715/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1716/// cast+dereference. 1717 1718// CheckICE - This function does the fundamental ICE checking: the returned 1719// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1720// Note that to reduce code duplication, this helper does no evaluation 1721// itself; the caller checks whether the expression is evaluatable, and 1722// in the rare cases where CheckICE actually cares about the evaluated 1723// value, it calls into Evalute. 1724// 1725// Meanings of Val: 1726// 0: This expression is an ICE if it can be evaluated by Evaluate. 1727// 1: This expression is not an ICE, but if it isn't evaluated, it's 1728// a legal subexpression for an ICE. This return value is used to handle 1729// the comma operator in C99 mode. 1730// 2: This expression is not an ICE, and is not a legal subexpression for one. 1731 1732struct ICEDiag { 1733 unsigned Val; 1734 SourceLocation Loc; 1735 1736 public: 1737 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1738 ICEDiag() : Val(0) {} 1739}; 1740 1741ICEDiag NoDiag() { return ICEDiag(); } 1742 1743static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1744 Expr::EvalResult EVResult; 1745 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1746 !EVResult.Val.isInt()) { 1747 return ICEDiag(2, E->getLocStart()); 1748 } 1749 return NoDiag(); 1750} 1751 1752static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1753 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1754 if (!E->getType()->isIntegralType()) { 1755 return ICEDiag(2, E->getLocStart()); 1756 } 1757 1758 switch (E->getStmtClass()) { 1759#define STMT(Node, Base) case Expr::Node##Class: 1760#define EXPR(Node, Base) 1761#include "clang/AST/StmtNodes.def" 1762 case Expr::PredefinedExprClass: 1763 case Expr::FloatingLiteralClass: 1764 case Expr::ImaginaryLiteralClass: 1765 case Expr::StringLiteralClass: 1766 case Expr::ArraySubscriptExprClass: 1767 case Expr::MemberExprClass: 1768 case Expr::CompoundAssignOperatorClass: 1769 case Expr::CompoundLiteralExprClass: 1770 case Expr::ExtVectorElementExprClass: 1771 case Expr::InitListExprClass: 1772 case Expr::DesignatedInitExprClass: 1773 case Expr::ImplicitValueInitExprClass: 1774 case Expr::ParenListExprClass: 1775 case Expr::VAArgExprClass: 1776 case Expr::AddrLabelExprClass: 1777 case Expr::StmtExprClass: 1778 case Expr::CXXMemberCallExprClass: 1779 case Expr::CXXDynamicCastExprClass: 1780 case Expr::CXXTypeidExprClass: 1781 case Expr::CXXNullPtrLiteralExprClass: 1782 case Expr::CXXThisExprClass: 1783 case Expr::CXXThrowExprClass: 1784 case Expr::CXXNewExprClass: 1785 case Expr::CXXDeleteExprClass: 1786 case Expr::CXXPseudoDestructorExprClass: 1787 case Expr::UnresolvedLookupExprClass: 1788 case Expr::DependentScopeDeclRefExprClass: 1789 case Expr::CXXConstructExprClass: 1790 case Expr::CXXBindTemporaryExprClass: 1791 case Expr::CXXBindReferenceExprClass: 1792 case Expr::CXXExprWithTemporariesClass: 1793 case Expr::CXXTemporaryObjectExprClass: 1794 case Expr::CXXUnresolvedConstructExprClass: 1795 case Expr::CXXDependentScopeMemberExprClass: 1796 case Expr::UnresolvedMemberExprClass: 1797 case Expr::ObjCStringLiteralClass: 1798 case Expr::ObjCEncodeExprClass: 1799 case Expr::ObjCMessageExprClass: 1800 case Expr::ObjCSelectorExprClass: 1801 case Expr::ObjCProtocolExprClass: 1802 case Expr::ObjCIvarRefExprClass: 1803 case Expr::ObjCPropertyRefExprClass: 1804 case Expr::ObjCImplicitSetterGetterRefExprClass: 1805 case Expr::ObjCSuperExprClass: 1806 case Expr::ObjCIsaExprClass: 1807 case Expr::ShuffleVectorExprClass: 1808 case Expr::BlockExprClass: 1809 case Expr::BlockDeclRefExprClass: 1810 case Expr::NoStmtClass: 1811 return ICEDiag(2, E->getLocStart()); 1812 1813 case Expr::GNUNullExprClass: 1814 // GCC considers the GNU __null value to be an integral constant expression. 1815 return NoDiag(); 1816 1817 case Expr::ParenExprClass: 1818 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1819 case Expr::IntegerLiteralClass: 1820 case Expr::CharacterLiteralClass: 1821 case Expr::CXXBoolLiteralExprClass: 1822 case Expr::CXXZeroInitValueExprClass: 1823 case Expr::TypesCompatibleExprClass: 1824 case Expr::UnaryTypeTraitExprClass: 1825 return NoDiag(); 1826 case Expr::CallExprClass: 1827 case Expr::CXXOperatorCallExprClass: { 1828 const CallExpr *CE = cast<CallExpr>(E); 1829 if (CE->isBuiltinCall(Ctx)) 1830 return CheckEvalInICE(E, Ctx); 1831 return ICEDiag(2, E->getLocStart()); 1832 } 1833 case Expr::DeclRefExprClass: 1834 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1835 return NoDiag(); 1836 if (Ctx.getLangOptions().CPlusPlus && 1837 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1838 const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 1839 1840 // Parameter variables are never constants. Without this check, 1841 // getAnyInitializer() can find a default argument, which leads 1842 // to chaos. 1843 if (isa<ParmVarDecl>(D)) 1844 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1845 1846 // C++ 7.1.5.1p2 1847 // A variable of non-volatile const-qualified integral or enumeration 1848 // type initialized by an ICE can be used in ICEs. 1849 if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 1850 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1851 if (Quals.hasVolatile() || !Quals.hasConst()) 1852 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1853 1854 // Look for a declaration of this variable that has an initializer. 1855 const VarDecl *ID = 0; 1856 const Expr *Init = Dcl->getAnyInitializer(ID); 1857 if (Init) { 1858 if (ID->isInitKnownICE()) { 1859 // We have already checked whether this subexpression is an 1860 // integral constant expression. 1861 if (ID->isInitICE()) 1862 return NoDiag(); 1863 else 1864 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1865 } 1866 1867 // It's an ICE whether or not the definition we found is 1868 // out-of-line. See DR 721 and the discussion in Clang PR 1869 // 6206 for details. 1870 1871 if (Dcl->isCheckingICE()) { 1872 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1873 } 1874 1875 Dcl->setCheckingICE(); 1876 ICEDiag Result = CheckICE(Init, Ctx); 1877 // Cache the result of the ICE test. 1878 Dcl->setInitKnownICE(Result.Val == 0); 1879 return Result; 1880 } 1881 } 1882 } 1883 return ICEDiag(2, E->getLocStart()); 1884 case Expr::UnaryOperatorClass: { 1885 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1886 switch (Exp->getOpcode()) { 1887 case UnaryOperator::PostInc: 1888 case UnaryOperator::PostDec: 1889 case UnaryOperator::PreInc: 1890 case UnaryOperator::PreDec: 1891 case UnaryOperator::AddrOf: 1892 case UnaryOperator::Deref: 1893 return ICEDiag(2, E->getLocStart()); 1894 1895 case UnaryOperator::Extension: 1896 case UnaryOperator::LNot: 1897 case UnaryOperator::Plus: 1898 case UnaryOperator::Minus: 1899 case UnaryOperator::Not: 1900 case UnaryOperator::Real: 1901 case UnaryOperator::Imag: 1902 return CheckICE(Exp->getSubExpr(), Ctx); 1903 case UnaryOperator::OffsetOf: 1904 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1905 // Evaluate matches the proposed gcc behavior for cases like 1906 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1907 // compliance: we should warn earlier for offsetof expressions with 1908 // array subscripts that aren't ICEs, and if the array subscripts 1909 // are ICEs, the value of the offsetof must be an integer constant. 1910 return CheckEvalInICE(E, Ctx); 1911 } 1912 } 1913 case Expr::SizeOfAlignOfExprClass: { 1914 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1915 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1916 return ICEDiag(2, E->getLocStart()); 1917 return NoDiag(); 1918 } 1919 case Expr::BinaryOperatorClass: { 1920 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1921 switch (Exp->getOpcode()) { 1922 case BinaryOperator::PtrMemD: 1923 case BinaryOperator::PtrMemI: 1924 case BinaryOperator::Assign: 1925 case BinaryOperator::MulAssign: 1926 case BinaryOperator::DivAssign: 1927 case BinaryOperator::RemAssign: 1928 case BinaryOperator::AddAssign: 1929 case BinaryOperator::SubAssign: 1930 case BinaryOperator::ShlAssign: 1931 case BinaryOperator::ShrAssign: 1932 case BinaryOperator::AndAssign: 1933 case BinaryOperator::XorAssign: 1934 case BinaryOperator::OrAssign: 1935 return ICEDiag(2, E->getLocStart()); 1936 1937 case BinaryOperator::Mul: 1938 case BinaryOperator::Div: 1939 case BinaryOperator::Rem: 1940 case BinaryOperator::Add: 1941 case BinaryOperator::Sub: 1942 case BinaryOperator::Shl: 1943 case BinaryOperator::Shr: 1944 case BinaryOperator::LT: 1945 case BinaryOperator::GT: 1946 case BinaryOperator::LE: 1947 case BinaryOperator::GE: 1948 case BinaryOperator::EQ: 1949 case BinaryOperator::NE: 1950 case BinaryOperator::And: 1951 case BinaryOperator::Xor: 1952 case BinaryOperator::Or: 1953 case BinaryOperator::Comma: { 1954 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1955 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1956 if (Exp->getOpcode() == BinaryOperator::Div || 1957 Exp->getOpcode() == BinaryOperator::Rem) { 1958 // Evaluate gives an error for undefined Div/Rem, so make sure 1959 // we don't evaluate one. 1960 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1961 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1962 if (REval == 0) 1963 return ICEDiag(1, E->getLocStart()); 1964 if (REval.isSigned() && REval.isAllOnesValue()) { 1965 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1966 if (LEval.isMinSignedValue()) 1967 return ICEDiag(1, E->getLocStart()); 1968 } 1969 } 1970 } 1971 if (Exp->getOpcode() == BinaryOperator::Comma) { 1972 if (Ctx.getLangOptions().C99) { 1973 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1974 // if it isn't evaluated. 1975 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1976 return ICEDiag(1, E->getLocStart()); 1977 } else { 1978 // In both C89 and C++, commas in ICEs are illegal. 1979 return ICEDiag(2, E->getLocStart()); 1980 } 1981 } 1982 if (LHSResult.Val >= RHSResult.Val) 1983 return LHSResult; 1984 return RHSResult; 1985 } 1986 case BinaryOperator::LAnd: 1987 case BinaryOperator::LOr: { 1988 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1989 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1990 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1991 // Rare case where the RHS has a comma "side-effect"; we need 1992 // to actually check the condition to see whether the side 1993 // with the comma is evaluated. 1994 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1995 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1996 return RHSResult; 1997 return NoDiag(); 1998 } 1999 2000 if (LHSResult.Val >= RHSResult.Val) 2001 return LHSResult; 2002 return RHSResult; 2003 } 2004 } 2005 } 2006 case Expr::ImplicitCastExprClass: 2007 case Expr::CStyleCastExprClass: 2008 case Expr::CXXFunctionalCastExprClass: 2009 case Expr::CXXStaticCastExprClass: 2010 case Expr::CXXReinterpretCastExprClass: 2011 case Expr::CXXConstCastExprClass: { 2012 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 2013 if (SubExpr->getType()->isIntegralType()) 2014 return CheckICE(SubExpr, Ctx); 2015 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 2016 return NoDiag(); 2017 return ICEDiag(2, E->getLocStart()); 2018 } 2019 case Expr::ConditionalOperatorClass: { 2020 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 2021 // If the condition (ignoring parens) is a __builtin_constant_p call, 2022 // then only the true side is actually considered in an integer constant 2023 // expression, and it is fully evaluated. This is an important GNU 2024 // extension. See GCC PR38377 for discussion. 2025 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 2026 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 2027 Expr::EvalResult EVResult; 2028 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 2029 !EVResult.Val.isInt()) { 2030 return ICEDiag(2, E->getLocStart()); 2031 } 2032 return NoDiag(); 2033 } 2034 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 2035 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 2036 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 2037 if (CondResult.Val == 2) 2038 return CondResult; 2039 if (TrueResult.Val == 2) 2040 return TrueResult; 2041 if (FalseResult.Val == 2) 2042 return FalseResult; 2043 if (CondResult.Val == 1) 2044 return CondResult; 2045 if (TrueResult.Val == 0 && FalseResult.Val == 0) 2046 return NoDiag(); 2047 // Rare case where the diagnostics depend on which side is evaluated 2048 // Note that if we get here, CondResult is 0, and at least one of 2049 // TrueResult and FalseResult is non-zero. 2050 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 2051 return FalseResult; 2052 } 2053 return TrueResult; 2054 } 2055 case Expr::CXXDefaultArgExprClass: 2056 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 2057 case Expr::ChooseExprClass: { 2058 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 2059 } 2060 } 2061 2062 // Silence a GCC warning 2063 return ICEDiag(2, E->getLocStart()); 2064} 2065 2066bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 2067 SourceLocation *Loc, bool isEvaluated) const { 2068 ICEDiag d = CheckICE(this, Ctx); 2069 if (d.Val != 0) { 2070 if (Loc) *Loc = d.Loc; 2071 return false; 2072 } 2073 EvalResult EvalResult; 2074 if (!Evaluate(EvalResult, Ctx)) 2075 llvm_unreachable("ICE cannot be evaluated!"); 2076 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 2077 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 2078 Result = EvalResult.Val.getInt(); 2079 return true; 2080} 2081 2082/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2083/// integer constant expression with the value zero, or if this is one that is 2084/// cast to void*. 2085bool Expr::isNullPointerConstant(ASTContext &Ctx, 2086 NullPointerConstantValueDependence NPC) const { 2087 if (isValueDependent()) { 2088 switch (NPC) { 2089 case NPC_NeverValueDependent: 2090 assert(false && "Unexpected value dependent expression!"); 2091 // If the unthinkable happens, fall through to the safest alternative. 2092 2093 case NPC_ValueDependentIsNull: 2094 return isTypeDependent() || getType()->isIntegralType(); 2095 2096 case NPC_ValueDependentIsNotNull: 2097 return false; 2098 } 2099 } 2100 2101 // Strip off a cast to void*, if it exists. Except in C++. 2102 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2103 if (!Ctx.getLangOptions().CPlusPlus) { 2104 // Check that it is a cast to void*. 2105 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2106 QualType Pointee = PT->getPointeeType(); 2107 if (!Pointee.hasQualifiers() && 2108 Pointee->isVoidType() && // to void* 2109 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2110 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2111 } 2112 } 2113 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2114 // Ignore the ImplicitCastExpr type entirely. 2115 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2116 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2117 // Accept ((void*)0) as a null pointer constant, as many other 2118 // implementations do. 2119 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2120 } else if (const CXXDefaultArgExpr *DefaultArg 2121 = dyn_cast<CXXDefaultArgExpr>(this)) { 2122 // See through default argument expressions 2123 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2124 } else if (isa<GNUNullExpr>(this)) { 2125 // The GNU __null extension is always a null pointer constant. 2126 return true; 2127 } 2128 2129 // C++0x nullptr_t is always a null pointer constant. 2130 if (getType()->isNullPtrType()) 2131 return true; 2132 2133 // This expression must be an integer type. 2134 if (!getType()->isIntegerType() || 2135 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2136 return false; 2137 2138 // If we have an integer constant expression, we need to *evaluate* it and 2139 // test for the value 0. 2140 llvm::APSInt Result; 2141 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2142} 2143 2144FieldDecl *Expr::getBitField() { 2145 Expr *E = this->IgnoreParens(); 2146 2147 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2148 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2149 E = ICE->getSubExpr()->IgnoreParens(); 2150 else 2151 break; 2152 } 2153 2154 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2155 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2156 if (Field->isBitField()) 2157 return Field; 2158 2159 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2160 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2161 return BinOp->getLHS()->getBitField(); 2162 2163 return 0; 2164} 2165 2166bool Expr::refersToVectorElement() const { 2167 const Expr *E = this->IgnoreParens(); 2168 2169 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2170 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 2171 E = ICE->getSubExpr()->IgnoreParens(); 2172 else 2173 break; 2174 } 2175 2176 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2177 return ASE->getBase()->getType()->isVectorType(); 2178 2179 if (isa<ExtVectorElementExpr>(E)) 2180 return true; 2181 2182 return false; 2183} 2184 2185/// isArrow - Return true if the base expression is a pointer to vector, 2186/// return false if the base expression is a vector. 2187bool ExtVectorElementExpr::isArrow() const { 2188 return getBase()->getType()->isPointerType(); 2189} 2190 2191unsigned ExtVectorElementExpr::getNumElements() const { 2192 if (const VectorType *VT = getType()->getAs<VectorType>()) 2193 return VT->getNumElements(); 2194 return 1; 2195} 2196 2197/// containsDuplicateElements - Return true if any element access is repeated. 2198bool ExtVectorElementExpr::containsDuplicateElements() const { 2199 // FIXME: Refactor this code to an accessor on the AST node which returns the 2200 // "type" of component access, and share with code below and in Sema. 2201 llvm::StringRef Comp = Accessor->getName(); 2202 2203 // Halving swizzles do not contain duplicate elements. 2204 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2205 return false; 2206 2207 // Advance past s-char prefix on hex swizzles. 2208 if (Comp[0] == 's' || Comp[0] == 'S') 2209 Comp = Comp.substr(1); 2210 2211 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2212 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2213 return true; 2214 2215 return false; 2216} 2217 2218/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2219void ExtVectorElementExpr::getEncodedElementAccess( 2220 llvm::SmallVectorImpl<unsigned> &Elts) const { 2221 llvm::StringRef Comp = Accessor->getName(); 2222 if (Comp[0] == 's' || Comp[0] == 'S') 2223 Comp = Comp.substr(1); 2224 2225 bool isHi = Comp == "hi"; 2226 bool isLo = Comp == "lo"; 2227 bool isEven = Comp == "even"; 2228 bool isOdd = Comp == "odd"; 2229 2230 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2231 uint64_t Index; 2232 2233 if (isHi) 2234 Index = e + i; 2235 else if (isLo) 2236 Index = i; 2237 else if (isEven) 2238 Index = 2 * i; 2239 else if (isOdd) 2240 Index = 2 * i + 1; 2241 else 2242 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2243 2244 Elts.push_back(Index); 2245 } 2246} 2247 2248ObjCMessageExpr::ObjCMessageExpr(QualType T, 2249 SourceLocation LBracLoc, 2250 SourceLocation SuperLoc, 2251 bool IsInstanceSuper, 2252 QualType SuperType, 2253 Selector Sel, 2254 ObjCMethodDecl *Method, 2255 Expr **Args, unsigned NumArgs, 2256 SourceLocation RBracLoc) 2257 : Expr(ObjCMessageExprClass, T, /*TypeDependent=*/false, 2258 /*ValueDependent=*/false), 2259 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2260 HasMethod(Method != 0), SuperLoc(SuperLoc), 2261 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2262 : Sel.getAsOpaquePtr())), 2263 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2264{ 2265 setReceiverPointer(SuperType.getAsOpaquePtr()); 2266 if (NumArgs) 2267 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2268} 2269 2270ObjCMessageExpr::ObjCMessageExpr(QualType T, 2271 SourceLocation LBracLoc, 2272 TypeSourceInfo *Receiver, 2273 Selector Sel, 2274 ObjCMethodDecl *Method, 2275 Expr **Args, unsigned NumArgs, 2276 SourceLocation RBracLoc) 2277 : Expr(ObjCMessageExprClass, T, T->isDependentType(), 2278 (T->isDependentType() || 2279 hasAnyValueDependentArguments(Args, NumArgs))), 2280 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2281 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2282 : Sel.getAsOpaquePtr())), 2283 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2284{ 2285 setReceiverPointer(Receiver); 2286 if (NumArgs) 2287 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2288} 2289 2290ObjCMessageExpr::ObjCMessageExpr(QualType T, 2291 SourceLocation LBracLoc, 2292 Expr *Receiver, 2293 Selector Sel, 2294 ObjCMethodDecl *Method, 2295 Expr **Args, unsigned NumArgs, 2296 SourceLocation RBracLoc) 2297 : Expr(ObjCMessageExprClass, T, Receiver->isTypeDependent(), 2298 (Receiver->isTypeDependent() || 2299 hasAnyValueDependentArguments(Args, NumArgs))), 2300 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2301 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2302 : Sel.getAsOpaquePtr())), 2303 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2304{ 2305 setReceiverPointer(Receiver); 2306 if (NumArgs) 2307 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2308} 2309 2310ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2311 SourceLocation LBracLoc, 2312 SourceLocation SuperLoc, 2313 bool IsInstanceSuper, 2314 QualType SuperType, 2315 Selector Sel, 2316 ObjCMethodDecl *Method, 2317 Expr **Args, unsigned NumArgs, 2318 SourceLocation RBracLoc) { 2319 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2320 NumArgs * sizeof(Expr *); 2321 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2322 return new (Mem) ObjCMessageExpr(T, LBracLoc, SuperLoc, IsInstanceSuper, 2323 SuperType, Sel, Method, Args, NumArgs, 2324 RBracLoc); 2325} 2326 2327ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2328 SourceLocation LBracLoc, 2329 TypeSourceInfo *Receiver, 2330 Selector Sel, 2331 ObjCMethodDecl *Method, 2332 Expr **Args, unsigned NumArgs, 2333 SourceLocation RBracLoc) { 2334 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2335 NumArgs * sizeof(Expr *); 2336 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2337 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2338 NumArgs, RBracLoc); 2339} 2340 2341ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2342 SourceLocation LBracLoc, 2343 Expr *Receiver, 2344 Selector Sel, 2345 ObjCMethodDecl *Method, 2346 Expr **Args, unsigned NumArgs, 2347 SourceLocation RBracLoc) { 2348 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2349 NumArgs * sizeof(Expr *); 2350 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2351 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2352 NumArgs, RBracLoc); 2353} 2354 2355ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2356 unsigned NumArgs) { 2357 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2358 NumArgs * sizeof(Expr *); 2359 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2360 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2361} 2362 2363Selector ObjCMessageExpr::getSelector() const { 2364 if (HasMethod) 2365 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2366 ->getSelector(); 2367 return Selector(SelectorOrMethod); 2368} 2369 2370ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2371 switch (getReceiverKind()) { 2372 case Instance: 2373 if (const ObjCObjectPointerType *Ptr 2374 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2375 return Ptr->getInterfaceDecl(); 2376 break; 2377 2378 case Class: 2379 if (const ObjCInterfaceType *Iface 2380 = getClassReceiver()->getAs<ObjCInterfaceType>()) 2381 return Iface->getDecl(); 2382 break; 2383 2384 case SuperInstance: 2385 if (const ObjCObjectPointerType *Ptr 2386 = getSuperType()->getAs<ObjCObjectPointerType>()) 2387 return Ptr->getInterfaceDecl(); 2388 break; 2389 2390 case SuperClass: 2391 if (const ObjCObjectPointerType *Iface 2392 = getSuperType()->getAs<ObjCObjectPointerType>()) 2393 return Iface->getInterfaceDecl(); 2394 break; 2395 } 2396 2397 return 0; 2398} 2399 2400bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2401 return getCond()->EvaluateAsInt(C) != 0; 2402} 2403 2404void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2405 unsigned NumExprs) { 2406 if (SubExprs) C.Deallocate(SubExprs); 2407 2408 SubExprs = new (C) Stmt* [NumExprs]; 2409 this->NumExprs = NumExprs; 2410 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2411} 2412 2413void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2414 DestroyChildren(C); 2415 if (SubExprs) C.Deallocate(SubExprs); 2416 this->~ShuffleVectorExpr(); 2417 C.Deallocate(this); 2418} 2419 2420void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2421 // Override default behavior of traversing children. If this has a type 2422 // operand and the type is a variable-length array, the child iteration 2423 // will iterate over the size expression. However, this expression belongs 2424 // to the type, not to this, so we don't want to delete it. 2425 // We still want to delete this expression. 2426 if (isArgumentType()) { 2427 this->~SizeOfAlignOfExpr(); 2428 C.Deallocate(this); 2429 } 2430 else 2431 Expr::DoDestroy(C); 2432} 2433 2434//===----------------------------------------------------------------------===// 2435// DesignatedInitExpr 2436//===----------------------------------------------------------------------===// 2437 2438IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2439 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2440 if (Field.NameOrField & 0x01) 2441 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2442 else 2443 return getField()->getIdentifier(); 2444} 2445 2446DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2447 unsigned NumDesignators, 2448 const Designator *Designators, 2449 SourceLocation EqualOrColonLoc, 2450 bool GNUSyntax, 2451 Expr **IndexExprs, 2452 unsigned NumIndexExprs, 2453 Expr *Init) 2454 : Expr(DesignatedInitExprClass, Ty, 2455 Init->isTypeDependent(), Init->isValueDependent()), 2456 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2457 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2458 this->Designators = new (C) Designator[NumDesignators]; 2459 2460 // Record the initializer itself. 2461 child_iterator Child = child_begin(); 2462 *Child++ = Init; 2463 2464 // Copy the designators and their subexpressions, computing 2465 // value-dependence along the way. 2466 unsigned IndexIdx = 0; 2467 for (unsigned I = 0; I != NumDesignators; ++I) { 2468 this->Designators[I] = Designators[I]; 2469 2470 if (this->Designators[I].isArrayDesignator()) { 2471 // Compute type- and value-dependence. 2472 Expr *Index = IndexExprs[IndexIdx]; 2473 ValueDependent = ValueDependent || 2474 Index->isTypeDependent() || Index->isValueDependent(); 2475 2476 // Copy the index expressions into permanent storage. 2477 *Child++ = IndexExprs[IndexIdx++]; 2478 } else if (this->Designators[I].isArrayRangeDesignator()) { 2479 // Compute type- and value-dependence. 2480 Expr *Start = IndexExprs[IndexIdx]; 2481 Expr *End = IndexExprs[IndexIdx + 1]; 2482 ValueDependent = ValueDependent || 2483 Start->isTypeDependent() || Start->isValueDependent() || 2484 End->isTypeDependent() || End->isValueDependent(); 2485 2486 // Copy the start/end expressions into permanent storage. 2487 *Child++ = IndexExprs[IndexIdx++]; 2488 *Child++ = IndexExprs[IndexIdx++]; 2489 } 2490 } 2491 2492 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2493} 2494 2495DesignatedInitExpr * 2496DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2497 unsigned NumDesignators, 2498 Expr **IndexExprs, unsigned NumIndexExprs, 2499 SourceLocation ColonOrEqualLoc, 2500 bool UsesColonSyntax, Expr *Init) { 2501 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2502 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2503 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2504 ColonOrEqualLoc, UsesColonSyntax, 2505 IndexExprs, NumIndexExprs, Init); 2506} 2507 2508DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2509 unsigned NumIndexExprs) { 2510 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2511 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2512 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2513} 2514 2515void DesignatedInitExpr::setDesignators(ASTContext &C, 2516 const Designator *Desigs, 2517 unsigned NumDesigs) { 2518 DestroyDesignators(C); 2519 2520 Designators = new (C) Designator[NumDesigs]; 2521 NumDesignators = NumDesigs; 2522 for (unsigned I = 0; I != NumDesigs; ++I) 2523 Designators[I] = Desigs[I]; 2524} 2525 2526SourceRange DesignatedInitExpr::getSourceRange() const { 2527 SourceLocation StartLoc; 2528 Designator &First = 2529 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2530 if (First.isFieldDesignator()) { 2531 if (GNUSyntax) 2532 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2533 else 2534 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2535 } else 2536 StartLoc = 2537 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2538 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2539} 2540 2541Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2542 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2543 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2544 Ptr += sizeof(DesignatedInitExpr); 2545 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2546 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2547} 2548 2549Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2550 assert(D.Kind == Designator::ArrayRangeDesignator && 2551 "Requires array range designator"); 2552 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2553 Ptr += sizeof(DesignatedInitExpr); 2554 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2555 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2556} 2557 2558Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2559 assert(D.Kind == Designator::ArrayRangeDesignator && 2560 "Requires array range designator"); 2561 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2562 Ptr += sizeof(DesignatedInitExpr); 2563 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2564 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2565} 2566 2567/// \brief Replaces the designator at index @p Idx with the series 2568/// of designators in [First, Last). 2569void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2570 const Designator *First, 2571 const Designator *Last) { 2572 unsigned NumNewDesignators = Last - First; 2573 if (NumNewDesignators == 0) { 2574 std::copy_backward(Designators + Idx + 1, 2575 Designators + NumDesignators, 2576 Designators + Idx); 2577 --NumNewDesignators; 2578 return; 2579 } else if (NumNewDesignators == 1) { 2580 Designators[Idx] = *First; 2581 return; 2582 } 2583 2584 Designator *NewDesignators 2585 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2586 std::copy(Designators, Designators + Idx, NewDesignators); 2587 std::copy(First, Last, NewDesignators + Idx); 2588 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2589 NewDesignators + Idx + NumNewDesignators); 2590 DestroyDesignators(C); 2591 Designators = NewDesignators; 2592 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2593} 2594 2595void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2596 DestroyDesignators(C); 2597 Expr::DoDestroy(C); 2598} 2599 2600void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2601 for (unsigned I = 0; I != NumDesignators; ++I) 2602 Designators[I].~Designator(); 2603 C.Deallocate(Designators); 2604 Designators = 0; 2605} 2606 2607ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2608 Expr **exprs, unsigned nexprs, 2609 SourceLocation rparenloc) 2610: Expr(ParenListExprClass, QualType(), 2611 hasAnyTypeDependentArguments(exprs, nexprs), 2612 hasAnyValueDependentArguments(exprs, nexprs)), 2613 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2614 2615 Exprs = new (C) Stmt*[nexprs]; 2616 for (unsigned i = 0; i != nexprs; ++i) 2617 Exprs[i] = exprs[i]; 2618} 2619 2620void ParenListExpr::DoDestroy(ASTContext& C) { 2621 DestroyChildren(C); 2622 if (Exprs) C.Deallocate(Exprs); 2623 this->~ParenListExpr(); 2624 C.Deallocate(this); 2625} 2626 2627//===----------------------------------------------------------------------===// 2628// ExprIterator. 2629//===----------------------------------------------------------------------===// 2630 2631Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2632Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2633Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2634const Expr* ConstExprIterator::operator[](size_t idx) const { 2635 return cast<Expr>(I[idx]); 2636} 2637const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2638const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2639 2640//===----------------------------------------------------------------------===// 2641// Child Iterators for iterating over subexpressions/substatements 2642//===----------------------------------------------------------------------===// 2643 2644// DeclRefExpr 2645Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2646Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2647 2648// ObjCIvarRefExpr 2649Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2650Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2651 2652// ObjCPropertyRefExpr 2653Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2654Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2655 2656// ObjCImplicitSetterGetterRefExpr 2657Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2658 return &Base; 2659} 2660Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2661 return &Base+1; 2662} 2663 2664// ObjCSuperExpr 2665Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2666Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2667 2668// ObjCIsaExpr 2669Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2670Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2671 2672// PredefinedExpr 2673Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2674Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2675 2676// IntegerLiteral 2677Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2678Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2679 2680// CharacterLiteral 2681Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2682Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2683 2684// FloatingLiteral 2685Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2686Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2687 2688// ImaginaryLiteral 2689Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2690Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2691 2692// StringLiteral 2693Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2694Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2695 2696// ParenExpr 2697Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2698Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2699 2700// UnaryOperator 2701Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2702Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2703 2704// SizeOfAlignOfExpr 2705Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2706 // If this is of a type and the type is a VLA type (and not a typedef), the 2707 // size expression of the VLA needs to be treated as an executable expression. 2708 // Why isn't this weirdness documented better in StmtIterator? 2709 if (isArgumentType()) { 2710 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2711 getArgumentType().getTypePtr())) 2712 return child_iterator(T); 2713 return child_iterator(); 2714 } 2715 return child_iterator(&Argument.Ex); 2716} 2717Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2718 if (isArgumentType()) 2719 return child_iterator(); 2720 return child_iterator(&Argument.Ex + 1); 2721} 2722 2723// ArraySubscriptExpr 2724Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2725 return &SubExprs[0]; 2726} 2727Stmt::child_iterator ArraySubscriptExpr::child_end() { 2728 return &SubExprs[0]+END_EXPR; 2729} 2730 2731// CallExpr 2732Stmt::child_iterator CallExpr::child_begin() { 2733 return &SubExprs[0]; 2734} 2735Stmt::child_iterator CallExpr::child_end() { 2736 return &SubExprs[0]+NumArgs+ARGS_START; 2737} 2738 2739// MemberExpr 2740Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2741Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2742 2743// ExtVectorElementExpr 2744Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2745Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2746 2747// CompoundLiteralExpr 2748Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2749Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2750 2751// CastExpr 2752Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2753Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2754 2755// BinaryOperator 2756Stmt::child_iterator BinaryOperator::child_begin() { 2757 return &SubExprs[0]; 2758} 2759Stmt::child_iterator BinaryOperator::child_end() { 2760 return &SubExprs[0]+END_EXPR; 2761} 2762 2763// ConditionalOperator 2764Stmt::child_iterator ConditionalOperator::child_begin() { 2765 return &SubExprs[0]; 2766} 2767Stmt::child_iterator ConditionalOperator::child_end() { 2768 return &SubExprs[0]+END_EXPR; 2769} 2770 2771// AddrLabelExpr 2772Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2773Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2774 2775// StmtExpr 2776Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2777Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2778 2779// TypesCompatibleExpr 2780Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2781 return child_iterator(); 2782} 2783 2784Stmt::child_iterator TypesCompatibleExpr::child_end() { 2785 return child_iterator(); 2786} 2787 2788// ChooseExpr 2789Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2790Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2791 2792// GNUNullExpr 2793Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2794Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2795 2796// ShuffleVectorExpr 2797Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2798 return &SubExprs[0]; 2799} 2800Stmt::child_iterator ShuffleVectorExpr::child_end() { 2801 return &SubExprs[0]+NumExprs; 2802} 2803 2804// VAArgExpr 2805Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2806Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2807 2808// InitListExpr 2809Stmt::child_iterator InitListExpr::child_begin() { 2810 return InitExprs.size() ? &InitExprs[0] : 0; 2811} 2812Stmt::child_iterator InitListExpr::child_end() { 2813 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2814} 2815 2816// DesignatedInitExpr 2817Stmt::child_iterator DesignatedInitExpr::child_begin() { 2818 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2819 Ptr += sizeof(DesignatedInitExpr); 2820 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2821} 2822Stmt::child_iterator DesignatedInitExpr::child_end() { 2823 return child_iterator(&*child_begin() + NumSubExprs); 2824} 2825 2826// ImplicitValueInitExpr 2827Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2828 return child_iterator(); 2829} 2830 2831Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2832 return child_iterator(); 2833} 2834 2835// ParenListExpr 2836Stmt::child_iterator ParenListExpr::child_begin() { 2837 return &Exprs[0]; 2838} 2839Stmt::child_iterator ParenListExpr::child_end() { 2840 return &Exprs[0]+NumExprs; 2841} 2842 2843// ObjCStringLiteral 2844Stmt::child_iterator ObjCStringLiteral::child_begin() { 2845 return &String; 2846} 2847Stmt::child_iterator ObjCStringLiteral::child_end() { 2848 return &String+1; 2849} 2850 2851// ObjCEncodeExpr 2852Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2853Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2854 2855// ObjCSelectorExpr 2856Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2857 return child_iterator(); 2858} 2859Stmt::child_iterator ObjCSelectorExpr::child_end() { 2860 return child_iterator(); 2861} 2862 2863// ObjCProtocolExpr 2864Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2865 return child_iterator(); 2866} 2867Stmt::child_iterator ObjCProtocolExpr::child_end() { 2868 return child_iterator(); 2869} 2870 2871// ObjCMessageExpr 2872Stmt::child_iterator ObjCMessageExpr::child_begin() { 2873 if (getReceiverKind() == Instance) 2874 return reinterpret_cast<Stmt **>(this + 1); 2875 return getArgs(); 2876} 2877Stmt::child_iterator ObjCMessageExpr::child_end() { 2878 return getArgs() + getNumArgs(); 2879} 2880 2881// Blocks 2882Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2883Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2884 2885Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2886Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2887