Expr.cpp revision e9ff443040cb571ae2c5c2626c4dc9a9a812d84a
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// Primary Expressions. 32//===----------------------------------------------------------------------===// 33 34void ExplicitTemplateArgumentList::initializeFrom( 35 const TemplateArgumentListInfo &Info) { 36 LAngleLoc = Info.getLAngleLoc(); 37 RAngleLoc = Info.getRAngleLoc(); 38 NumTemplateArgs = Info.size(); 39 40 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 41 for (unsigned i = 0; i != NumTemplateArgs; ++i) 42 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 43} 44 45void ExplicitTemplateArgumentList::copyInto( 46 TemplateArgumentListInfo &Info) const { 47 Info.setLAngleLoc(LAngleLoc); 48 Info.setRAngleLoc(RAngleLoc); 49 for (unsigned I = 0; I != NumTemplateArgs; ++I) 50 Info.addArgument(getTemplateArgs()[I]); 51} 52 53std::size_t ExplicitTemplateArgumentList::sizeFor( 54 const TemplateArgumentListInfo &Info) { 55 return sizeof(ExplicitTemplateArgumentList) + 56 sizeof(TemplateArgumentLoc) * Info.size(); 57} 58 59void DeclRefExpr::computeDependence() { 60 TypeDependent = false; 61 ValueDependent = false; 62 63 NamedDecl *D = getDecl(); 64 65 // (TD) C++ [temp.dep.expr]p3: 66 // An id-expression is type-dependent if it contains: 67 // 68 // and 69 // 70 // (VD) C++ [temp.dep.constexpr]p2: 71 // An identifier is value-dependent if it is: 72 73 // (TD) - an identifier that was declared with dependent type 74 // (VD) - a name declared with a dependent type, 75 if (getType()->isDependentType()) { 76 TypeDependent = true; 77 ValueDependent = true; 78 } 79 // (TD) - a conversion-function-id that specifies a dependent type 80 else if (D->getDeclName().getNameKind() 81 == DeclarationName::CXXConversionFunctionName && 82 D->getDeclName().getCXXNameType()->isDependentType()) { 83 TypeDependent = true; 84 ValueDependent = true; 85 } 86 // (TD) - a template-id that is dependent, 87 else if (hasExplicitTemplateArgumentList() && 88 TemplateSpecializationType::anyDependentTemplateArguments( 89 getTemplateArgs(), 90 getNumTemplateArgs())) { 91 TypeDependent = true; 92 ValueDependent = true; 93 } 94 // (VD) - the name of a non-type template parameter, 95 else if (isa<NonTypeTemplateParmDecl>(D)) 96 ValueDependent = true; 97 // (VD) - a constant with integral or enumeration type and is 98 // initialized with an expression that is value-dependent. 99 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 100 if (Var->getType()->isIntegralType() && 101 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 102 if (const Expr *Init = Var->getAnyInitializer()) 103 if (Init->isValueDependent()) 104 ValueDependent = true; 105 } 106 } 107 // (TD) - a nested-name-specifier or a qualified-id that names a 108 // member of an unknown specialization. 109 // (handled by DependentScopeDeclRefExpr) 110} 111 112DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 113 SourceRange QualifierRange, 114 ValueDecl *D, SourceLocation NameLoc, 115 const TemplateArgumentListInfo *TemplateArgs, 116 QualType T) 117 : Expr(DeclRefExprClass, T, false, false), 118 DecoratedD(D, 119 (Qualifier? HasQualifierFlag : 0) | 120 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 121 Loc(NameLoc) { 122 if (Qualifier) { 123 NameQualifier *NQ = getNameQualifier(); 124 NQ->NNS = Qualifier; 125 NQ->Range = QualifierRange; 126 } 127 128 if (TemplateArgs) 129 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 130 131 computeDependence(); 132} 133 134DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 135 NestedNameSpecifier *Qualifier, 136 SourceRange QualifierRange, 137 ValueDecl *D, 138 SourceLocation NameLoc, 139 QualType T, 140 const TemplateArgumentListInfo *TemplateArgs) { 141 std::size_t Size = sizeof(DeclRefExpr); 142 if (Qualifier != 0) 143 Size += sizeof(NameQualifier); 144 145 if (TemplateArgs) 146 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 147 148 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 149 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 150 TemplateArgs, T); 151} 152 153SourceRange DeclRefExpr::getSourceRange() const { 154 // FIXME: Does not handle multi-token names well, e.g., operator[]. 155 SourceRange R(Loc); 156 157 if (hasQualifier()) 158 R.setBegin(getQualifierRange().getBegin()); 159 if (hasExplicitTemplateArgumentList()) 160 R.setEnd(getRAngleLoc()); 161 return R; 162} 163 164// FIXME: Maybe this should use DeclPrinter with a special "print predefined 165// expr" policy instead. 166std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 167 const Decl *CurrentDecl) { 168 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 169 if (IT != PrettyFunction) 170 return FD->getNameAsString(); 171 172 llvm::SmallString<256> Name; 173 llvm::raw_svector_ostream Out(Name); 174 175 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 176 if (MD->isVirtual()) 177 Out << "virtual "; 178 if (MD->isStatic()) 179 Out << "static "; 180 } 181 182 PrintingPolicy Policy(Context.getLangOptions()); 183 Policy.SuppressTagKind = true; 184 185 std::string Proto = FD->getQualifiedNameAsString(Policy); 186 187 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 188 const FunctionProtoType *FT = 0; 189 if (FD->hasWrittenPrototype()) 190 FT = dyn_cast<FunctionProtoType>(AFT); 191 192 Proto += "("; 193 if (FT) { 194 llvm::raw_string_ostream POut(Proto); 195 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 196 if (i) POut << ", "; 197 std::string Param; 198 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 199 POut << Param; 200 } 201 202 if (FT->isVariadic()) { 203 if (FD->getNumParams()) POut << ", "; 204 POut << "..."; 205 } 206 } 207 Proto += ")"; 208 209 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 210 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 211 if (ThisQuals.hasConst()) 212 Proto += " const"; 213 if (ThisQuals.hasVolatile()) 214 Proto += " volatile"; 215 } 216 217 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 218 AFT->getResultType().getAsStringInternal(Proto, Policy); 219 220 Out << Proto; 221 222 Out.flush(); 223 return Name.str().str(); 224 } 225 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 226 llvm::SmallString<256> Name; 227 llvm::raw_svector_ostream Out(Name); 228 Out << (MD->isInstanceMethod() ? '-' : '+'); 229 Out << '['; 230 Out << MD->getClassInterface()->getNameAsString(); 231 if (const ObjCCategoryImplDecl *CID = 232 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 233 Out << '('; 234 Out << CID->getNameAsString(); 235 Out << ')'; 236 } 237 Out << ' '; 238 Out << MD->getSelector().getAsString(); 239 Out << ']'; 240 241 Out.flush(); 242 return Name.str().str(); 243 } 244 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 245 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 246 return "top level"; 247 } 248 return ""; 249} 250 251/// getValueAsApproximateDouble - This returns the value as an inaccurate 252/// double. Note that this may cause loss of precision, but is useful for 253/// debugging dumps, etc. 254double FloatingLiteral::getValueAsApproximateDouble() const { 255 llvm::APFloat V = getValue(); 256 bool ignored; 257 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 258 &ignored); 259 return V.convertToDouble(); 260} 261 262StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 263 unsigned ByteLength, bool Wide, 264 QualType Ty, 265 const SourceLocation *Loc, 266 unsigned NumStrs) { 267 // Allocate enough space for the StringLiteral plus an array of locations for 268 // any concatenated string tokens. 269 void *Mem = C.Allocate(sizeof(StringLiteral)+ 270 sizeof(SourceLocation)*(NumStrs-1), 271 llvm::alignof<StringLiteral>()); 272 StringLiteral *SL = new (Mem) StringLiteral(Ty); 273 274 // OPTIMIZE: could allocate this appended to the StringLiteral. 275 char *AStrData = new (C, 1) char[ByteLength]; 276 memcpy(AStrData, StrData, ByteLength); 277 SL->StrData = AStrData; 278 SL->ByteLength = ByteLength; 279 SL->IsWide = Wide; 280 SL->TokLocs[0] = Loc[0]; 281 SL->NumConcatenated = NumStrs; 282 283 if (NumStrs != 1) 284 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 285 return SL; 286} 287 288StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 289 void *Mem = C.Allocate(sizeof(StringLiteral)+ 290 sizeof(SourceLocation)*(NumStrs-1), 291 llvm::alignof<StringLiteral>()); 292 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 293 SL->StrData = 0; 294 SL->ByteLength = 0; 295 SL->NumConcatenated = NumStrs; 296 return SL; 297} 298 299void StringLiteral::DoDestroy(ASTContext &C) { 300 C.Deallocate(const_cast<char*>(StrData)); 301 Expr::DoDestroy(C); 302} 303 304void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 305 if (StrData) 306 C.Deallocate(const_cast<char*>(StrData)); 307 308 char *AStrData = new (C, 1) char[Str.size()]; 309 memcpy(AStrData, Str.data(), Str.size()); 310 StrData = AStrData; 311 ByteLength = Str.size(); 312} 313 314/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 315/// corresponds to, e.g. "sizeof" or "[pre]++". 316const char *UnaryOperator::getOpcodeStr(Opcode Op) { 317 switch (Op) { 318 default: assert(0 && "Unknown unary operator"); 319 case PostInc: return "++"; 320 case PostDec: return "--"; 321 case PreInc: return "++"; 322 case PreDec: return "--"; 323 case AddrOf: return "&"; 324 case Deref: return "*"; 325 case Plus: return "+"; 326 case Minus: return "-"; 327 case Not: return "~"; 328 case LNot: return "!"; 329 case Real: return "__real"; 330 case Imag: return "__imag"; 331 case Extension: return "__extension__"; 332 case OffsetOf: return "__builtin_offsetof"; 333 } 334} 335 336UnaryOperator::Opcode 337UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 338 switch (OO) { 339 default: assert(false && "No unary operator for overloaded function"); 340 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 341 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 342 case OO_Amp: return AddrOf; 343 case OO_Star: return Deref; 344 case OO_Plus: return Plus; 345 case OO_Minus: return Minus; 346 case OO_Tilde: return Not; 347 case OO_Exclaim: return LNot; 348 } 349} 350 351OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 352 switch (Opc) { 353 case PostInc: case PreInc: return OO_PlusPlus; 354 case PostDec: case PreDec: return OO_MinusMinus; 355 case AddrOf: return OO_Amp; 356 case Deref: return OO_Star; 357 case Plus: return OO_Plus; 358 case Minus: return OO_Minus; 359 case Not: return OO_Tilde; 360 case LNot: return OO_Exclaim; 361 default: return OO_None; 362 } 363} 364 365 366//===----------------------------------------------------------------------===// 367// Postfix Operators. 368//===----------------------------------------------------------------------===// 369 370CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 371 unsigned numargs, QualType t, SourceLocation rparenloc) 372 : Expr(SC, t, 373 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 374 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 375 NumArgs(numargs) { 376 377 SubExprs = new (C) Stmt*[numargs+1]; 378 SubExprs[FN] = fn; 379 for (unsigned i = 0; i != numargs; ++i) 380 SubExprs[i+ARGS_START] = args[i]; 381 382 RParenLoc = rparenloc; 383} 384 385CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 386 QualType t, SourceLocation rparenloc) 387 : Expr(CallExprClass, t, 388 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 389 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 390 NumArgs(numargs) { 391 392 SubExprs = new (C) Stmt*[numargs+1]; 393 SubExprs[FN] = fn; 394 for (unsigned i = 0; i != numargs; ++i) 395 SubExprs[i+ARGS_START] = args[i]; 396 397 RParenLoc = rparenloc; 398} 399 400CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 401 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 402 SubExprs = new (C) Stmt*[1]; 403} 404 405void CallExpr::DoDestroy(ASTContext& C) { 406 DestroyChildren(C); 407 if (SubExprs) C.Deallocate(SubExprs); 408 this->~CallExpr(); 409 C.Deallocate(this); 410} 411 412Decl *CallExpr::getCalleeDecl() { 413 Expr *CEE = getCallee()->IgnoreParenCasts(); 414 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 415 return DRE->getDecl(); 416 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 417 return ME->getMemberDecl(); 418 419 return 0; 420} 421 422FunctionDecl *CallExpr::getDirectCallee() { 423 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 424} 425 426/// setNumArgs - This changes the number of arguments present in this call. 427/// Any orphaned expressions are deleted by this, and any new operands are set 428/// to null. 429void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 430 // No change, just return. 431 if (NumArgs == getNumArgs()) return; 432 433 // If shrinking # arguments, just delete the extras and forgot them. 434 if (NumArgs < getNumArgs()) { 435 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 436 getArg(i)->Destroy(C); 437 this->NumArgs = NumArgs; 438 return; 439 } 440 441 // Otherwise, we are growing the # arguments. New an bigger argument array. 442 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 443 // Copy over args. 444 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 445 NewSubExprs[i] = SubExprs[i]; 446 // Null out new args. 447 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 448 NewSubExprs[i] = 0; 449 450 if (SubExprs) C.Deallocate(SubExprs); 451 SubExprs = NewSubExprs; 452 this->NumArgs = NumArgs; 453} 454 455/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 456/// not, return 0. 457unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 458 // All simple function calls (e.g. func()) are implicitly cast to pointer to 459 // function. As a result, we try and obtain the DeclRefExpr from the 460 // ImplicitCastExpr. 461 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 462 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 463 return 0; 464 465 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 466 if (!DRE) 467 return 0; 468 469 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 470 if (!FDecl) 471 return 0; 472 473 if (!FDecl->getIdentifier()) 474 return 0; 475 476 return FDecl->getBuiltinID(); 477} 478 479QualType CallExpr::getCallReturnType() const { 480 QualType CalleeType = getCallee()->getType(); 481 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 482 CalleeType = FnTypePtr->getPointeeType(); 483 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 484 CalleeType = BPT->getPointeeType(); 485 486 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 487 return FnType->getResultType(); 488} 489 490MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 491 SourceRange qualrange, ValueDecl *memberdecl, 492 SourceLocation l, const TemplateArgumentListInfo *targs, 493 QualType ty) 494 : Expr(MemberExprClass, ty, 495 base->isTypeDependent() || (qual && qual->isDependent()), 496 base->isValueDependent() || (qual && qual->isDependent())), 497 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 498 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 499 // Initialize the qualifier, if any. 500 if (HasQualifier) { 501 NameQualifier *NQ = getMemberQualifier(); 502 NQ->NNS = qual; 503 NQ->Range = qualrange; 504 } 505 506 // Initialize the explicit template argument list, if any. 507 if (targs) 508 getExplicitTemplateArgumentList()->initializeFrom(*targs); 509} 510 511MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 512 NestedNameSpecifier *qual, 513 SourceRange qualrange, 514 ValueDecl *memberdecl, 515 SourceLocation l, 516 const TemplateArgumentListInfo *targs, 517 QualType ty) { 518 std::size_t Size = sizeof(MemberExpr); 519 if (qual != 0) 520 Size += sizeof(NameQualifier); 521 522 if (targs) 523 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 524 525 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 526 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 527 targs, ty); 528} 529 530const char *CastExpr::getCastKindName() const { 531 switch (getCastKind()) { 532 case CastExpr::CK_Unknown: 533 return "Unknown"; 534 case CastExpr::CK_BitCast: 535 return "BitCast"; 536 case CastExpr::CK_NoOp: 537 return "NoOp"; 538 case CastExpr::CK_BaseToDerived: 539 return "BaseToDerived"; 540 case CastExpr::CK_DerivedToBase: 541 return "DerivedToBase"; 542 case CastExpr::CK_Dynamic: 543 return "Dynamic"; 544 case CastExpr::CK_ToUnion: 545 return "ToUnion"; 546 case CastExpr::CK_ArrayToPointerDecay: 547 return "ArrayToPointerDecay"; 548 case CastExpr::CK_FunctionToPointerDecay: 549 return "FunctionToPointerDecay"; 550 case CastExpr::CK_NullToMemberPointer: 551 return "NullToMemberPointer"; 552 case CastExpr::CK_BaseToDerivedMemberPointer: 553 return "BaseToDerivedMemberPointer"; 554 case CastExpr::CK_DerivedToBaseMemberPointer: 555 return "DerivedToBaseMemberPointer"; 556 case CastExpr::CK_UserDefinedConversion: 557 return "UserDefinedConversion"; 558 case CastExpr::CK_ConstructorConversion: 559 return "ConstructorConversion"; 560 case CastExpr::CK_IntegralToPointer: 561 return "IntegralToPointer"; 562 case CastExpr::CK_PointerToIntegral: 563 return "PointerToIntegral"; 564 case CastExpr::CK_ToVoid: 565 return "ToVoid"; 566 case CastExpr::CK_VectorSplat: 567 return "VectorSplat"; 568 case CastExpr::CK_IntegralCast: 569 return "IntegralCast"; 570 case CastExpr::CK_IntegralToFloating: 571 return "IntegralToFloating"; 572 case CastExpr::CK_FloatingToIntegral: 573 return "FloatingToIntegral"; 574 case CastExpr::CK_FloatingCast: 575 return "FloatingCast"; 576 case CastExpr::CK_MemberPointerToBoolean: 577 return "MemberPointerToBoolean"; 578 case CastExpr::CK_AnyPointerToObjCPointerCast: 579 return "AnyPointerToObjCPointerCast"; 580 case CastExpr::CK_AnyPointerToBlockPointerCast: 581 return "AnyPointerToBlockPointerCast"; 582 } 583 584 assert(0 && "Unhandled cast kind!"); 585 return 0; 586} 587 588Expr *CastExpr::getSubExprAsWritten() { 589 Expr *SubExpr = 0; 590 CastExpr *E = this; 591 do { 592 SubExpr = E->getSubExpr(); 593 594 // Skip any temporary bindings; they're implicit. 595 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 596 SubExpr = Binder->getSubExpr(); 597 598 // Conversions by constructor and conversion functions have a 599 // subexpression describing the call; strip it off. 600 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 601 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 602 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 603 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 604 605 // If the subexpression we're left with is an implicit cast, look 606 // through that, too. 607 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 608 609 return SubExpr; 610} 611 612/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 613/// corresponds to, e.g. "<<=". 614const char *BinaryOperator::getOpcodeStr(Opcode Op) { 615 switch (Op) { 616 case PtrMemD: return ".*"; 617 case PtrMemI: return "->*"; 618 case Mul: return "*"; 619 case Div: return "/"; 620 case Rem: return "%"; 621 case Add: return "+"; 622 case Sub: return "-"; 623 case Shl: return "<<"; 624 case Shr: return ">>"; 625 case LT: return "<"; 626 case GT: return ">"; 627 case LE: return "<="; 628 case GE: return ">="; 629 case EQ: return "=="; 630 case NE: return "!="; 631 case And: return "&"; 632 case Xor: return "^"; 633 case Or: return "|"; 634 case LAnd: return "&&"; 635 case LOr: return "||"; 636 case Assign: return "="; 637 case MulAssign: return "*="; 638 case DivAssign: return "/="; 639 case RemAssign: return "%="; 640 case AddAssign: return "+="; 641 case SubAssign: return "-="; 642 case ShlAssign: return "<<="; 643 case ShrAssign: return ">>="; 644 case AndAssign: return "&="; 645 case XorAssign: return "^="; 646 case OrAssign: return "|="; 647 case Comma: return ","; 648 } 649 650 return ""; 651} 652 653BinaryOperator::Opcode 654BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 655 switch (OO) { 656 default: assert(false && "Not an overloadable binary operator"); 657 case OO_Plus: return Add; 658 case OO_Minus: return Sub; 659 case OO_Star: return Mul; 660 case OO_Slash: return Div; 661 case OO_Percent: return Rem; 662 case OO_Caret: return Xor; 663 case OO_Amp: return And; 664 case OO_Pipe: return Or; 665 case OO_Equal: return Assign; 666 case OO_Less: return LT; 667 case OO_Greater: return GT; 668 case OO_PlusEqual: return AddAssign; 669 case OO_MinusEqual: return SubAssign; 670 case OO_StarEqual: return MulAssign; 671 case OO_SlashEqual: return DivAssign; 672 case OO_PercentEqual: return RemAssign; 673 case OO_CaretEqual: return XorAssign; 674 case OO_AmpEqual: return AndAssign; 675 case OO_PipeEqual: return OrAssign; 676 case OO_LessLess: return Shl; 677 case OO_GreaterGreater: return Shr; 678 case OO_LessLessEqual: return ShlAssign; 679 case OO_GreaterGreaterEqual: return ShrAssign; 680 case OO_EqualEqual: return EQ; 681 case OO_ExclaimEqual: return NE; 682 case OO_LessEqual: return LE; 683 case OO_GreaterEqual: return GE; 684 case OO_AmpAmp: return LAnd; 685 case OO_PipePipe: return LOr; 686 case OO_Comma: return Comma; 687 case OO_ArrowStar: return PtrMemI; 688 } 689} 690 691OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 692 static const OverloadedOperatorKind OverOps[] = { 693 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 694 OO_Star, OO_Slash, OO_Percent, 695 OO_Plus, OO_Minus, 696 OO_LessLess, OO_GreaterGreater, 697 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 698 OO_EqualEqual, OO_ExclaimEqual, 699 OO_Amp, 700 OO_Caret, 701 OO_Pipe, 702 OO_AmpAmp, 703 OO_PipePipe, 704 OO_Equal, OO_StarEqual, 705 OO_SlashEqual, OO_PercentEqual, 706 OO_PlusEqual, OO_MinusEqual, 707 OO_LessLessEqual, OO_GreaterGreaterEqual, 708 OO_AmpEqual, OO_CaretEqual, 709 OO_PipeEqual, 710 OO_Comma 711 }; 712 return OverOps[Opc]; 713} 714 715InitListExpr::InitListExpr(SourceLocation lbraceloc, 716 Expr **initExprs, unsigned numInits, 717 SourceLocation rbraceloc) 718 : Expr(InitListExprClass, QualType(), false, false), 719 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 720 UnionFieldInit(0), HadArrayRangeDesignator(false) 721{ 722 for (unsigned I = 0; I != numInits; ++I) { 723 if (initExprs[I]->isTypeDependent()) 724 TypeDependent = true; 725 if (initExprs[I]->isValueDependent()) 726 ValueDependent = true; 727 } 728 729 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 730} 731 732void InitListExpr::reserveInits(unsigned NumInits) { 733 if (NumInits > InitExprs.size()) 734 InitExprs.reserve(NumInits); 735} 736 737void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 738 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 739 Idx < LastIdx; ++Idx) 740 InitExprs[Idx]->Destroy(Context); 741 InitExprs.resize(NumInits, 0); 742} 743 744Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 745 if (Init >= InitExprs.size()) { 746 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 747 InitExprs.back() = expr; 748 return 0; 749 } 750 751 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 752 InitExprs[Init] = expr; 753 return Result; 754} 755 756/// getFunctionType - Return the underlying function type for this block. 757/// 758const FunctionType *BlockExpr::getFunctionType() const { 759 return getType()->getAs<BlockPointerType>()-> 760 getPointeeType()->getAs<FunctionType>(); 761} 762 763SourceLocation BlockExpr::getCaretLocation() const { 764 return TheBlock->getCaretLocation(); 765} 766const Stmt *BlockExpr::getBody() const { 767 return TheBlock->getBody(); 768} 769Stmt *BlockExpr::getBody() { 770 return TheBlock->getBody(); 771} 772 773 774//===----------------------------------------------------------------------===// 775// Generic Expression Routines 776//===----------------------------------------------------------------------===// 777 778/// isUnusedResultAWarning - Return true if this immediate expression should 779/// be warned about if the result is unused. If so, fill in Loc and Ranges 780/// with location to warn on and the source range[s] to report with the 781/// warning. 782bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 783 SourceRange &R2, ASTContext &Ctx) const { 784 // Don't warn if the expr is type dependent. The type could end up 785 // instantiating to void. 786 if (isTypeDependent()) 787 return false; 788 789 switch (getStmtClass()) { 790 default: 791 Loc = getExprLoc(); 792 R1 = getSourceRange(); 793 return true; 794 case ParenExprClass: 795 return cast<ParenExpr>(this)->getSubExpr()-> 796 isUnusedResultAWarning(Loc, R1, R2, Ctx); 797 case UnaryOperatorClass: { 798 const UnaryOperator *UO = cast<UnaryOperator>(this); 799 800 switch (UO->getOpcode()) { 801 default: break; 802 case UnaryOperator::PostInc: 803 case UnaryOperator::PostDec: 804 case UnaryOperator::PreInc: 805 case UnaryOperator::PreDec: // ++/-- 806 return false; // Not a warning. 807 case UnaryOperator::Deref: 808 // Dereferencing a volatile pointer is a side-effect. 809 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 810 return false; 811 break; 812 case UnaryOperator::Real: 813 case UnaryOperator::Imag: 814 // accessing a piece of a volatile complex is a side-effect. 815 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 816 .isVolatileQualified()) 817 return false; 818 break; 819 case UnaryOperator::Extension: 820 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 821 } 822 Loc = UO->getOperatorLoc(); 823 R1 = UO->getSubExpr()->getSourceRange(); 824 return true; 825 } 826 case BinaryOperatorClass: { 827 const BinaryOperator *BO = cast<BinaryOperator>(this); 828 // Consider comma to have side effects if the LHS or RHS does. 829 if (BO->getOpcode() == BinaryOperator::Comma) 830 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 831 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 832 833 if (BO->isAssignmentOp()) 834 return false; 835 Loc = BO->getOperatorLoc(); 836 R1 = BO->getLHS()->getSourceRange(); 837 R2 = BO->getRHS()->getSourceRange(); 838 return true; 839 } 840 case CompoundAssignOperatorClass: 841 return false; 842 843 case ConditionalOperatorClass: { 844 // The condition must be evaluated, but if either the LHS or RHS is a 845 // warning, warn about them. 846 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 847 if (Exp->getLHS() && 848 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 849 return true; 850 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 851 } 852 853 case MemberExprClass: 854 // If the base pointer or element is to a volatile pointer/field, accessing 855 // it is a side effect. 856 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 857 return false; 858 Loc = cast<MemberExpr>(this)->getMemberLoc(); 859 R1 = SourceRange(Loc, Loc); 860 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 861 return true; 862 863 case ArraySubscriptExprClass: 864 // If the base pointer or element is to a volatile pointer/field, accessing 865 // it is a side effect. 866 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 867 return false; 868 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 869 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 870 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 871 return true; 872 873 case CallExprClass: 874 case CXXOperatorCallExprClass: 875 case CXXMemberCallExprClass: { 876 // If this is a direct call, get the callee. 877 const CallExpr *CE = cast<CallExpr>(this); 878 if (const Decl *FD = CE->getCalleeDecl()) { 879 // If the callee has attribute pure, const, or warn_unused_result, warn 880 // about it. void foo() { strlen("bar"); } should warn. 881 // 882 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 883 // updated to match for QoI. 884 if (FD->getAttr<WarnUnusedResultAttr>() || 885 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 886 Loc = CE->getCallee()->getLocStart(); 887 R1 = CE->getCallee()->getSourceRange(); 888 889 if (unsigned NumArgs = CE->getNumArgs()) 890 R2 = SourceRange(CE->getArg(0)->getLocStart(), 891 CE->getArg(NumArgs-1)->getLocEnd()); 892 return true; 893 } 894 } 895 return false; 896 } 897 898 case CXXTemporaryObjectExprClass: 899 case CXXConstructExprClass: 900 return false; 901 902 case ObjCMessageExprClass: 903 return false; 904 905 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 906#if 0 907 const ObjCImplicitSetterGetterRefExpr *Ref = 908 cast<ObjCImplicitSetterGetterRefExpr>(this); 909 // FIXME: We really want the location of the '.' here. 910 Loc = Ref->getLocation(); 911 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 912 if (Ref->getBase()) 913 R2 = Ref->getBase()->getSourceRange(); 914#else 915 Loc = getExprLoc(); 916 R1 = getSourceRange(); 917#endif 918 return true; 919 } 920 case StmtExprClass: { 921 // Statement exprs don't logically have side effects themselves, but are 922 // sometimes used in macros in ways that give them a type that is unused. 923 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 924 // however, if the result of the stmt expr is dead, we don't want to emit a 925 // warning. 926 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 927 if (!CS->body_empty()) 928 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 929 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 930 931 Loc = cast<StmtExpr>(this)->getLParenLoc(); 932 R1 = getSourceRange(); 933 return true; 934 } 935 case CStyleCastExprClass: 936 // If this is an explicit cast to void, allow it. People do this when they 937 // think they know what they're doing :). 938 if (getType()->isVoidType()) 939 return false; 940 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 941 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 942 return true; 943 case CXXFunctionalCastExprClass: { 944 const CastExpr *CE = cast<CastExpr>(this); 945 946 // If this is a cast to void or a constructor conversion, check the operand. 947 // Otherwise, the result of the cast is unused. 948 if (CE->getCastKind() == CastExpr::CK_ToVoid || 949 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 950 return (cast<CastExpr>(this)->getSubExpr() 951 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 952 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 953 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 954 return true; 955 } 956 957 case ImplicitCastExprClass: 958 // Check the operand, since implicit casts are inserted by Sema 959 return (cast<ImplicitCastExpr>(this) 960 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 961 962 case CXXDefaultArgExprClass: 963 return (cast<CXXDefaultArgExpr>(this) 964 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 965 966 case CXXNewExprClass: 967 // FIXME: In theory, there might be new expressions that don't have side 968 // effects (e.g. a placement new with an uninitialized POD). 969 case CXXDeleteExprClass: 970 return false; 971 case CXXBindTemporaryExprClass: 972 return (cast<CXXBindTemporaryExpr>(this) 973 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 974 case CXXExprWithTemporariesClass: 975 return (cast<CXXExprWithTemporaries>(this) 976 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 977 } 978} 979 980/// DeclCanBeLvalue - Determine whether the given declaration can be 981/// an lvalue. This is a helper routine for isLvalue. 982static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 983 // C++ [temp.param]p6: 984 // A non-type non-reference template-parameter is not an lvalue. 985 if (const NonTypeTemplateParmDecl *NTTParm 986 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 987 return NTTParm->getType()->isReferenceType(); 988 989 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 990 // C++ 3.10p2: An lvalue refers to an object or function. 991 (Ctx.getLangOptions().CPlusPlus && 992 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 993} 994 995/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 996/// incomplete type other than void. Nonarray expressions that can be lvalues: 997/// - name, where name must be a variable 998/// - e[i] 999/// - (e), where e must be an lvalue 1000/// - e.name, where e must be an lvalue 1001/// - e->name 1002/// - *e, the type of e cannot be a function type 1003/// - string-constant 1004/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1005/// - reference type [C++ [expr]] 1006/// 1007Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1008 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1009 1010 isLvalueResult Res = isLvalueInternal(Ctx); 1011 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1012 return Res; 1013 1014 // first, check the type (C99 6.3.2.1). Expressions with function 1015 // type in C are not lvalues, but they can be lvalues in C++. 1016 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1017 return LV_NotObjectType; 1018 1019 // Allow qualified void which is an incomplete type other than void (yuck). 1020 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1021 return LV_IncompleteVoidType; 1022 1023 return LV_Valid; 1024} 1025 1026// Check whether the expression can be sanely treated like an l-value 1027Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1028 switch (getStmtClass()) { 1029 case ObjCIsaExprClass: 1030 case StringLiteralClass: // C99 6.5.1p4 1031 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1032 return LV_Valid; 1033 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1034 // For vectors, make sure base is an lvalue (i.e. not a function call). 1035 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1036 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1037 return LV_Valid; 1038 case DeclRefExprClass: { // C99 6.5.1p2 1039 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1040 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1041 return LV_Valid; 1042 break; 1043 } 1044 case BlockDeclRefExprClass: { 1045 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1046 if (isa<VarDecl>(BDR->getDecl())) 1047 return LV_Valid; 1048 break; 1049 } 1050 case MemberExprClass: { 1051 const MemberExpr *m = cast<MemberExpr>(this); 1052 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1053 NamedDecl *Member = m->getMemberDecl(); 1054 // C++ [expr.ref]p4: 1055 // If E2 is declared to have type "reference to T", then E1.E2 1056 // is an lvalue. 1057 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1058 if (Value->getType()->isReferenceType()) 1059 return LV_Valid; 1060 1061 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1062 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1063 return LV_Valid; 1064 1065 // -- If E2 is a non-static data member [...]. If E1 is an 1066 // lvalue, then E1.E2 is an lvalue. 1067 if (isa<FieldDecl>(Member)) { 1068 if (m->isArrow()) 1069 return LV_Valid; 1070 Expr *BaseExp = m->getBase(); 1071 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) 1072 return LV_SubObjCPropertySetting; 1073 return 1074 (BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) ? 1075 LV_SubObjCPropertyGetterSetting : BaseExp->isLvalue(Ctx); 1076 } 1077 1078 // -- If it refers to a static member function [...], then 1079 // E1.E2 is an lvalue. 1080 // -- Otherwise, if E1.E2 refers to a non-static member 1081 // function [...], then E1.E2 is not an lvalue. 1082 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1083 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1084 1085 // -- If E2 is a member enumerator [...], the expression E1.E2 1086 // is not an lvalue. 1087 if (isa<EnumConstantDecl>(Member)) 1088 return LV_InvalidExpression; 1089 1090 // Not an lvalue. 1091 return LV_InvalidExpression; 1092 } 1093 1094 // C99 6.5.2.3p4 1095 if (m->isArrow()) 1096 return LV_Valid; 1097 Expr *BaseExp = m->getBase(); 1098 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) 1099 return LV_SubObjCPropertySetting; 1100 return 1101 (BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) ? 1102 LV_SubObjCPropertyGetterSetting : BaseExp->isLvalue(Ctx); 1103 } 1104 case UnaryOperatorClass: 1105 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1106 return LV_Valid; // C99 6.5.3p4 1107 1108 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1109 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1110 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1111 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1112 1113 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1114 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1115 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1116 return LV_Valid; 1117 break; 1118 case ImplicitCastExprClass: 1119 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1120 : LV_InvalidExpression; 1121 case ParenExprClass: // C99 6.5.1p5 1122 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1123 case BinaryOperatorClass: 1124 case CompoundAssignOperatorClass: { 1125 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1126 1127 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1128 BinOp->getOpcode() == BinaryOperator::Comma) 1129 return BinOp->getRHS()->isLvalue(Ctx); 1130 1131 // C++ [expr.mptr.oper]p6 1132 // The result of a .* expression is an lvalue only if its first operand is 1133 // an lvalue and its second operand is a pointer to data member. 1134 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1135 !BinOp->getType()->isFunctionType()) 1136 return BinOp->getLHS()->isLvalue(Ctx); 1137 1138 // The result of an ->* expression is an lvalue only if its second operand 1139 // is a pointer to data member. 1140 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1141 !BinOp->getType()->isFunctionType()) { 1142 QualType Ty = BinOp->getRHS()->getType(); 1143 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1144 return LV_Valid; 1145 } 1146 1147 if (!BinOp->isAssignmentOp()) 1148 return LV_InvalidExpression; 1149 1150 if (Ctx.getLangOptions().CPlusPlus) 1151 // C++ [expr.ass]p1: 1152 // The result of an assignment operation [...] is an lvalue. 1153 return LV_Valid; 1154 1155 1156 // C99 6.5.16: 1157 // An assignment expression [...] is not an lvalue. 1158 return LV_InvalidExpression; 1159 } 1160 case CallExprClass: 1161 case CXXOperatorCallExprClass: 1162 case CXXMemberCallExprClass: { 1163 // C++0x [expr.call]p10 1164 // A function call is an lvalue if and only if the result type 1165 // is an lvalue reference. 1166 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1167 if (ReturnType->isLValueReferenceType()) 1168 return LV_Valid; 1169 1170 break; 1171 } 1172 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1173 return LV_Valid; 1174 case ChooseExprClass: 1175 // __builtin_choose_expr is an lvalue if the selected operand is. 1176 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1177 case ExtVectorElementExprClass: 1178 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1179 return LV_DuplicateVectorComponents; 1180 return LV_Valid; 1181 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1182 return LV_Valid; 1183 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1184 return LV_Valid; 1185 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1186 return LV_Valid; 1187 case PredefinedExprClass: 1188 return LV_Valid; 1189 case UnresolvedLookupExprClass: 1190 return LV_Valid; 1191 case CXXDefaultArgExprClass: 1192 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1193 case CStyleCastExprClass: 1194 case CXXFunctionalCastExprClass: 1195 case CXXStaticCastExprClass: 1196 case CXXDynamicCastExprClass: 1197 case CXXReinterpretCastExprClass: 1198 case CXXConstCastExprClass: 1199 // The result of an explicit cast is an lvalue if the type we are 1200 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1201 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1202 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1203 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1204 isLValueReferenceType()) 1205 return LV_Valid; 1206 break; 1207 case CXXTypeidExprClass: 1208 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1209 return LV_Valid; 1210 case CXXBindTemporaryExprClass: 1211 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1212 isLvalueInternal(Ctx); 1213 case CXXBindReferenceExprClass: 1214 // Something that's bound to a reference is always an lvalue. 1215 return LV_Valid; 1216 case ConditionalOperatorClass: { 1217 // Complicated handling is only for C++. 1218 if (!Ctx.getLangOptions().CPlusPlus) 1219 return LV_InvalidExpression; 1220 1221 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1222 // everywhere there's an object converted to an rvalue. Also, any other 1223 // casts should be wrapped by ImplicitCastExprs. There's just the special 1224 // case involving throws to work out. 1225 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1226 Expr *True = Cond->getTrueExpr(); 1227 Expr *False = Cond->getFalseExpr(); 1228 // C++0x 5.16p2 1229 // If either the second or the third operand has type (cv) void, [...] 1230 // the result [...] is an rvalue. 1231 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1232 return LV_InvalidExpression; 1233 1234 // Both sides must be lvalues for the result to be an lvalue. 1235 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1236 return LV_InvalidExpression; 1237 1238 // That's it. 1239 return LV_Valid; 1240 } 1241 1242 case Expr::CXXExprWithTemporariesClass: 1243 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1244 1245 case Expr::ObjCMessageExprClass: 1246 if (const ObjCMethodDecl *Method 1247 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1248 if (Method->getResultType()->isLValueReferenceType()) 1249 return LV_Valid; 1250 break; 1251 1252 default: 1253 break; 1254 } 1255 return LV_InvalidExpression; 1256} 1257 1258/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1259/// does not have an incomplete type, does not have a const-qualified type, and 1260/// if it is a structure or union, does not have any member (including, 1261/// recursively, any member or element of all contained aggregates or unions) 1262/// with a const-qualified type. 1263Expr::isModifiableLvalueResult 1264Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1265 isLvalueResult lvalResult = isLvalue(Ctx); 1266 1267 switch (lvalResult) { 1268 case LV_Valid: 1269 // C++ 3.10p11: Functions cannot be modified, but pointers to 1270 // functions can be modifiable. 1271 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1272 return MLV_NotObjectType; 1273 break; 1274 1275 case LV_NotObjectType: return MLV_NotObjectType; 1276 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1277 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1278 case LV_InvalidExpression: 1279 // If the top level is a C-style cast, and the subexpression is a valid 1280 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1281 // GCC extension. We don't support it, but we want to produce good 1282 // diagnostics when it happens so that the user knows why. 1283 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1284 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1285 if (Loc) 1286 *Loc = CE->getLParenLoc(); 1287 return MLV_LValueCast; 1288 } 1289 } 1290 return MLV_InvalidExpression; 1291 case LV_MemberFunction: return MLV_MemberFunction; 1292 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1293 case LV_SubObjCPropertyGetterSetting: 1294 return MLV_SubObjCPropertyGetterSetting; 1295 } 1296 1297 // The following is illegal: 1298 // void takeclosure(void (^C)(void)); 1299 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1300 // 1301 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1302 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1303 return MLV_NotBlockQualified; 1304 } 1305 1306 // Assigning to an 'implicit' property? 1307 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1308 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1309 if (Expr->getSetterMethod() == 0) 1310 return MLV_NoSetterProperty; 1311 } 1312 1313 QualType CT = Ctx.getCanonicalType(getType()); 1314 1315 if (CT.isConstQualified()) 1316 return MLV_ConstQualified; 1317 if (CT->isArrayType()) 1318 return MLV_ArrayType; 1319 if (CT->isIncompleteType()) 1320 return MLV_IncompleteType; 1321 1322 if (const RecordType *r = CT->getAs<RecordType>()) { 1323 if (r->hasConstFields()) 1324 return MLV_ConstQualified; 1325 } 1326 1327 return MLV_Valid; 1328} 1329 1330/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1331/// returns true, if it is; false otherwise. 1332bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1333 switch (getStmtClass()) { 1334 default: 1335 return false; 1336 case ObjCIvarRefExprClass: 1337 return true; 1338 case Expr::UnaryOperatorClass: 1339 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1340 case ParenExprClass: 1341 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1342 case ImplicitCastExprClass: 1343 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1344 case CStyleCastExprClass: 1345 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1346 case DeclRefExprClass: { 1347 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1348 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1349 if (VD->hasGlobalStorage()) 1350 return true; 1351 QualType T = VD->getType(); 1352 // dereferencing to a pointer is always a gc'able candidate, 1353 // unless it is __weak. 1354 return T->isPointerType() && 1355 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1356 } 1357 return false; 1358 } 1359 case MemberExprClass: { 1360 const MemberExpr *M = cast<MemberExpr>(this); 1361 return M->getBase()->isOBJCGCCandidate(Ctx); 1362 } 1363 case ArraySubscriptExprClass: 1364 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1365 } 1366} 1367Expr* Expr::IgnoreParens() { 1368 Expr* E = this; 1369 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1370 E = P->getSubExpr(); 1371 1372 return E; 1373} 1374 1375/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1376/// or CastExprs or ImplicitCastExprs, returning their operand. 1377Expr *Expr::IgnoreParenCasts() { 1378 Expr *E = this; 1379 while (true) { 1380 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1381 E = P->getSubExpr(); 1382 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1383 E = P->getSubExpr(); 1384 else 1385 return E; 1386 } 1387} 1388 1389/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1390/// value (including ptr->int casts of the same size). Strip off any 1391/// ParenExpr or CastExprs, returning their operand. 1392Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1393 Expr *E = this; 1394 while (true) { 1395 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1396 E = P->getSubExpr(); 1397 continue; 1398 } 1399 1400 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1401 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1402 // ptr<->int casts of the same width. We also ignore all identify casts. 1403 Expr *SE = P->getSubExpr(); 1404 1405 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1406 E = SE; 1407 continue; 1408 } 1409 1410 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1411 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1412 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1413 E = SE; 1414 continue; 1415 } 1416 } 1417 1418 return E; 1419 } 1420} 1421 1422bool Expr::isDefaultArgument() const { 1423 const Expr *E = this; 1424 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1425 E = ICE->getSubExprAsWritten(); 1426 1427 return isa<CXXDefaultArgExpr>(E); 1428} 1429 1430/// hasAnyTypeDependentArguments - Determines if any of the expressions 1431/// in Exprs is type-dependent. 1432bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1433 for (unsigned I = 0; I < NumExprs; ++I) 1434 if (Exprs[I]->isTypeDependent()) 1435 return true; 1436 1437 return false; 1438} 1439 1440/// hasAnyValueDependentArguments - Determines if any of the expressions 1441/// in Exprs is value-dependent. 1442bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1443 for (unsigned I = 0; I < NumExprs; ++I) 1444 if (Exprs[I]->isValueDependent()) 1445 return true; 1446 1447 return false; 1448} 1449 1450bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1451 // This function is attempting whether an expression is an initializer 1452 // which can be evaluated at compile-time. isEvaluatable handles most 1453 // of the cases, but it can't deal with some initializer-specific 1454 // expressions, and it can't deal with aggregates; we deal with those here, 1455 // and fall back to isEvaluatable for the other cases. 1456 1457 // FIXME: This function assumes the variable being assigned to 1458 // isn't a reference type! 1459 1460 switch (getStmtClass()) { 1461 default: break; 1462 case StringLiteralClass: 1463 case ObjCStringLiteralClass: 1464 case ObjCEncodeExprClass: 1465 return true; 1466 case CompoundLiteralExprClass: { 1467 // This handles gcc's extension that allows global initializers like 1468 // "struct x {int x;} x = (struct x) {};". 1469 // FIXME: This accepts other cases it shouldn't! 1470 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1471 return Exp->isConstantInitializer(Ctx); 1472 } 1473 case InitListExprClass: { 1474 // FIXME: This doesn't deal with fields with reference types correctly. 1475 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1476 // to bitfields. 1477 const InitListExpr *Exp = cast<InitListExpr>(this); 1478 unsigned numInits = Exp->getNumInits(); 1479 for (unsigned i = 0; i < numInits; i++) { 1480 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1481 return false; 1482 } 1483 return true; 1484 } 1485 case ImplicitValueInitExprClass: 1486 return true; 1487 case ParenExprClass: 1488 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1489 case UnaryOperatorClass: { 1490 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1491 if (Exp->getOpcode() == UnaryOperator::Extension) 1492 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1493 break; 1494 } 1495 case BinaryOperatorClass: { 1496 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1497 // but this handles the common case. 1498 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1499 if (Exp->getOpcode() == BinaryOperator::Sub && 1500 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1501 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1502 return true; 1503 break; 1504 } 1505 case ImplicitCastExprClass: 1506 case CStyleCastExprClass: 1507 // Handle casts with a destination that's a struct or union; this 1508 // deals with both the gcc no-op struct cast extension and the 1509 // cast-to-union extension. 1510 if (getType()->isRecordType()) 1511 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1512 1513 // Integer->integer casts can be handled here, which is important for 1514 // things like (int)(&&x-&&y). Scary but true. 1515 if (getType()->isIntegerType() && 1516 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1517 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1518 1519 break; 1520 } 1521 return isEvaluatable(Ctx); 1522} 1523 1524/// isIntegerConstantExpr - this recursive routine will test if an expression is 1525/// an integer constant expression. 1526 1527/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1528/// comma, etc 1529/// 1530/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1531/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1532/// cast+dereference. 1533 1534// CheckICE - This function does the fundamental ICE checking: the returned 1535// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1536// Note that to reduce code duplication, this helper does no evaluation 1537// itself; the caller checks whether the expression is evaluatable, and 1538// in the rare cases where CheckICE actually cares about the evaluated 1539// value, it calls into Evalute. 1540// 1541// Meanings of Val: 1542// 0: This expression is an ICE if it can be evaluated by Evaluate. 1543// 1: This expression is not an ICE, but if it isn't evaluated, it's 1544// a legal subexpression for an ICE. This return value is used to handle 1545// the comma operator in C99 mode. 1546// 2: This expression is not an ICE, and is not a legal subexpression for one. 1547 1548struct ICEDiag { 1549 unsigned Val; 1550 SourceLocation Loc; 1551 1552 public: 1553 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1554 ICEDiag() : Val(0) {} 1555}; 1556 1557ICEDiag NoDiag() { return ICEDiag(); } 1558 1559static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1560 Expr::EvalResult EVResult; 1561 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1562 !EVResult.Val.isInt()) { 1563 return ICEDiag(2, E->getLocStart()); 1564 } 1565 return NoDiag(); 1566} 1567 1568static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1569 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1570 if (!E->getType()->isIntegralType()) { 1571 return ICEDiag(2, E->getLocStart()); 1572 } 1573 1574 switch (E->getStmtClass()) { 1575#define STMT(Node, Base) case Expr::Node##Class: 1576#define EXPR(Node, Base) 1577#include "clang/AST/StmtNodes.def" 1578 case Expr::PredefinedExprClass: 1579 case Expr::FloatingLiteralClass: 1580 case Expr::ImaginaryLiteralClass: 1581 case Expr::StringLiteralClass: 1582 case Expr::ArraySubscriptExprClass: 1583 case Expr::MemberExprClass: 1584 case Expr::CompoundAssignOperatorClass: 1585 case Expr::CompoundLiteralExprClass: 1586 case Expr::ExtVectorElementExprClass: 1587 case Expr::InitListExprClass: 1588 case Expr::DesignatedInitExprClass: 1589 case Expr::ImplicitValueInitExprClass: 1590 case Expr::ParenListExprClass: 1591 case Expr::VAArgExprClass: 1592 case Expr::AddrLabelExprClass: 1593 case Expr::StmtExprClass: 1594 case Expr::CXXMemberCallExprClass: 1595 case Expr::CXXDynamicCastExprClass: 1596 case Expr::CXXTypeidExprClass: 1597 case Expr::CXXNullPtrLiteralExprClass: 1598 case Expr::CXXThisExprClass: 1599 case Expr::CXXThrowExprClass: 1600 case Expr::CXXNewExprClass: 1601 case Expr::CXXDeleteExprClass: 1602 case Expr::CXXPseudoDestructorExprClass: 1603 case Expr::UnresolvedLookupExprClass: 1604 case Expr::DependentScopeDeclRefExprClass: 1605 case Expr::CXXConstructExprClass: 1606 case Expr::CXXBindTemporaryExprClass: 1607 case Expr::CXXBindReferenceExprClass: 1608 case Expr::CXXExprWithTemporariesClass: 1609 case Expr::CXXTemporaryObjectExprClass: 1610 case Expr::CXXUnresolvedConstructExprClass: 1611 case Expr::CXXDependentScopeMemberExprClass: 1612 case Expr::UnresolvedMemberExprClass: 1613 case Expr::ObjCStringLiteralClass: 1614 case Expr::ObjCEncodeExprClass: 1615 case Expr::ObjCMessageExprClass: 1616 case Expr::ObjCSelectorExprClass: 1617 case Expr::ObjCProtocolExprClass: 1618 case Expr::ObjCIvarRefExprClass: 1619 case Expr::ObjCPropertyRefExprClass: 1620 case Expr::ObjCImplicitSetterGetterRefExprClass: 1621 case Expr::ObjCSuperExprClass: 1622 case Expr::ObjCIsaExprClass: 1623 case Expr::ShuffleVectorExprClass: 1624 case Expr::BlockExprClass: 1625 case Expr::BlockDeclRefExprClass: 1626 case Expr::NoStmtClass: 1627 return ICEDiag(2, E->getLocStart()); 1628 1629 case Expr::GNUNullExprClass: 1630 // GCC considers the GNU __null value to be an integral constant expression. 1631 return NoDiag(); 1632 1633 case Expr::ParenExprClass: 1634 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1635 case Expr::IntegerLiteralClass: 1636 case Expr::CharacterLiteralClass: 1637 case Expr::CXXBoolLiteralExprClass: 1638 case Expr::CXXZeroInitValueExprClass: 1639 case Expr::TypesCompatibleExprClass: 1640 case Expr::UnaryTypeTraitExprClass: 1641 return NoDiag(); 1642 case Expr::CallExprClass: 1643 case Expr::CXXOperatorCallExprClass: { 1644 const CallExpr *CE = cast<CallExpr>(E); 1645 if (CE->isBuiltinCall(Ctx)) 1646 return CheckEvalInICE(E, Ctx); 1647 return ICEDiag(2, E->getLocStart()); 1648 } 1649 case Expr::DeclRefExprClass: 1650 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1651 return NoDiag(); 1652 if (Ctx.getLangOptions().CPlusPlus && 1653 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1654 // C++ 7.1.5.1p2 1655 // A variable of non-volatile const-qualified integral or enumeration 1656 // type initialized by an ICE can be used in ICEs. 1657 if (const VarDecl *Dcl = 1658 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1659 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1660 if (Quals.hasVolatile() || !Quals.hasConst()) 1661 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1662 1663 // Look for a declaration of this variable that has an initializer. 1664 const VarDecl *ID = 0; 1665 const Expr *Init = Dcl->getAnyInitializer(ID); 1666 if (Init) { 1667 if (ID->isInitKnownICE()) { 1668 // We have already checked whether this subexpression is an 1669 // integral constant expression. 1670 if (ID->isInitICE()) 1671 return NoDiag(); 1672 else 1673 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1674 } 1675 1676 // It's an ICE whether or not the definition we found is 1677 // out-of-line. See DR 721 and the discussion in Clang PR 1678 // 6206 for details. 1679 1680 if (Dcl->isCheckingICE()) { 1681 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1682 } 1683 1684 Dcl->setCheckingICE(); 1685 ICEDiag Result = CheckICE(Init, Ctx); 1686 // Cache the result of the ICE test. 1687 Dcl->setInitKnownICE(Result.Val == 0); 1688 return Result; 1689 } 1690 } 1691 } 1692 return ICEDiag(2, E->getLocStart()); 1693 case Expr::UnaryOperatorClass: { 1694 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1695 switch (Exp->getOpcode()) { 1696 case UnaryOperator::PostInc: 1697 case UnaryOperator::PostDec: 1698 case UnaryOperator::PreInc: 1699 case UnaryOperator::PreDec: 1700 case UnaryOperator::AddrOf: 1701 case UnaryOperator::Deref: 1702 return ICEDiag(2, E->getLocStart()); 1703 1704 case UnaryOperator::Extension: 1705 case UnaryOperator::LNot: 1706 case UnaryOperator::Plus: 1707 case UnaryOperator::Minus: 1708 case UnaryOperator::Not: 1709 case UnaryOperator::Real: 1710 case UnaryOperator::Imag: 1711 return CheckICE(Exp->getSubExpr(), Ctx); 1712 case UnaryOperator::OffsetOf: 1713 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1714 // Evaluate matches the proposed gcc behavior for cases like 1715 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1716 // compliance: we should warn earlier for offsetof expressions with 1717 // array subscripts that aren't ICEs, and if the array subscripts 1718 // are ICEs, the value of the offsetof must be an integer constant. 1719 return CheckEvalInICE(E, Ctx); 1720 } 1721 } 1722 case Expr::SizeOfAlignOfExprClass: { 1723 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1724 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1725 return ICEDiag(2, E->getLocStart()); 1726 return NoDiag(); 1727 } 1728 case Expr::BinaryOperatorClass: { 1729 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1730 switch (Exp->getOpcode()) { 1731 case BinaryOperator::PtrMemD: 1732 case BinaryOperator::PtrMemI: 1733 case BinaryOperator::Assign: 1734 case BinaryOperator::MulAssign: 1735 case BinaryOperator::DivAssign: 1736 case BinaryOperator::RemAssign: 1737 case BinaryOperator::AddAssign: 1738 case BinaryOperator::SubAssign: 1739 case BinaryOperator::ShlAssign: 1740 case BinaryOperator::ShrAssign: 1741 case BinaryOperator::AndAssign: 1742 case BinaryOperator::XorAssign: 1743 case BinaryOperator::OrAssign: 1744 return ICEDiag(2, E->getLocStart()); 1745 1746 case BinaryOperator::Mul: 1747 case BinaryOperator::Div: 1748 case BinaryOperator::Rem: 1749 case BinaryOperator::Add: 1750 case BinaryOperator::Sub: 1751 case BinaryOperator::Shl: 1752 case BinaryOperator::Shr: 1753 case BinaryOperator::LT: 1754 case BinaryOperator::GT: 1755 case BinaryOperator::LE: 1756 case BinaryOperator::GE: 1757 case BinaryOperator::EQ: 1758 case BinaryOperator::NE: 1759 case BinaryOperator::And: 1760 case BinaryOperator::Xor: 1761 case BinaryOperator::Or: 1762 case BinaryOperator::Comma: { 1763 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1764 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1765 if (Exp->getOpcode() == BinaryOperator::Div || 1766 Exp->getOpcode() == BinaryOperator::Rem) { 1767 // Evaluate gives an error for undefined Div/Rem, so make sure 1768 // we don't evaluate one. 1769 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1770 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1771 if (REval == 0) 1772 return ICEDiag(1, E->getLocStart()); 1773 if (REval.isSigned() && REval.isAllOnesValue()) { 1774 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1775 if (LEval.isMinSignedValue()) 1776 return ICEDiag(1, E->getLocStart()); 1777 } 1778 } 1779 } 1780 if (Exp->getOpcode() == BinaryOperator::Comma) { 1781 if (Ctx.getLangOptions().C99) { 1782 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1783 // if it isn't evaluated. 1784 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1785 return ICEDiag(1, E->getLocStart()); 1786 } else { 1787 // In both C89 and C++, commas in ICEs are illegal. 1788 return ICEDiag(2, E->getLocStart()); 1789 } 1790 } 1791 if (LHSResult.Val >= RHSResult.Val) 1792 return LHSResult; 1793 return RHSResult; 1794 } 1795 case BinaryOperator::LAnd: 1796 case BinaryOperator::LOr: { 1797 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1798 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1799 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1800 // Rare case where the RHS has a comma "side-effect"; we need 1801 // to actually check the condition to see whether the side 1802 // with the comma is evaluated. 1803 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1804 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1805 return RHSResult; 1806 return NoDiag(); 1807 } 1808 1809 if (LHSResult.Val >= RHSResult.Val) 1810 return LHSResult; 1811 return RHSResult; 1812 } 1813 } 1814 } 1815 case Expr::ImplicitCastExprClass: 1816 case Expr::CStyleCastExprClass: 1817 case Expr::CXXFunctionalCastExprClass: 1818 case Expr::CXXNamedCastExprClass: 1819 case Expr::CXXStaticCastExprClass: 1820 case Expr::CXXReinterpretCastExprClass: 1821 case Expr::CXXConstCastExprClass: { 1822 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1823 if (SubExpr->getType()->isIntegralType()) 1824 return CheckICE(SubExpr, Ctx); 1825 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1826 return NoDiag(); 1827 return ICEDiag(2, E->getLocStart()); 1828 } 1829 case Expr::ConditionalOperatorClass: { 1830 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1831 // If the condition (ignoring parens) is a __builtin_constant_p call, 1832 // then only the true side is actually considered in an integer constant 1833 // expression, and it is fully evaluated. This is an important GNU 1834 // extension. See GCC PR38377 for discussion. 1835 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1836 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1837 Expr::EvalResult EVResult; 1838 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1839 !EVResult.Val.isInt()) { 1840 return ICEDiag(2, E->getLocStart()); 1841 } 1842 return NoDiag(); 1843 } 1844 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1845 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1846 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1847 if (CondResult.Val == 2) 1848 return CondResult; 1849 if (TrueResult.Val == 2) 1850 return TrueResult; 1851 if (FalseResult.Val == 2) 1852 return FalseResult; 1853 if (CondResult.Val == 1) 1854 return CondResult; 1855 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1856 return NoDiag(); 1857 // Rare case where the diagnostics depend on which side is evaluated 1858 // Note that if we get here, CondResult is 0, and at least one of 1859 // TrueResult and FalseResult is non-zero. 1860 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1861 return FalseResult; 1862 } 1863 return TrueResult; 1864 } 1865 case Expr::CXXDefaultArgExprClass: 1866 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1867 case Expr::ChooseExprClass: { 1868 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1869 } 1870 } 1871 1872 // Silence a GCC warning 1873 return ICEDiag(2, E->getLocStart()); 1874} 1875 1876bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1877 SourceLocation *Loc, bool isEvaluated) const { 1878 ICEDiag d = CheckICE(this, Ctx); 1879 if (d.Val != 0) { 1880 if (Loc) *Loc = d.Loc; 1881 return false; 1882 } 1883 EvalResult EvalResult; 1884 if (!Evaluate(EvalResult, Ctx)) 1885 llvm_unreachable("ICE cannot be evaluated!"); 1886 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1887 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1888 Result = EvalResult.Val.getInt(); 1889 return true; 1890} 1891 1892/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1893/// integer constant expression with the value zero, or if this is one that is 1894/// cast to void*. 1895bool Expr::isNullPointerConstant(ASTContext &Ctx, 1896 NullPointerConstantValueDependence NPC) const { 1897 if (isValueDependent()) { 1898 switch (NPC) { 1899 case NPC_NeverValueDependent: 1900 assert(false && "Unexpected value dependent expression!"); 1901 // If the unthinkable happens, fall through to the safest alternative. 1902 1903 case NPC_ValueDependentIsNull: 1904 return isTypeDependent() || getType()->isIntegralType(); 1905 1906 case NPC_ValueDependentIsNotNull: 1907 return false; 1908 } 1909 } 1910 1911 // Strip off a cast to void*, if it exists. Except in C++. 1912 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1913 if (!Ctx.getLangOptions().CPlusPlus) { 1914 // Check that it is a cast to void*. 1915 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1916 QualType Pointee = PT->getPointeeType(); 1917 if (!Pointee.hasQualifiers() && 1918 Pointee->isVoidType() && // to void* 1919 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1920 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1921 } 1922 } 1923 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1924 // Ignore the ImplicitCastExpr type entirely. 1925 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1926 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1927 // Accept ((void*)0) as a null pointer constant, as many other 1928 // implementations do. 1929 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1930 } else if (const CXXDefaultArgExpr *DefaultArg 1931 = dyn_cast<CXXDefaultArgExpr>(this)) { 1932 // See through default argument expressions 1933 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1934 } else if (isa<GNUNullExpr>(this)) { 1935 // The GNU __null extension is always a null pointer constant. 1936 return true; 1937 } 1938 1939 // C++0x nullptr_t is always a null pointer constant. 1940 if (getType()->isNullPtrType()) 1941 return true; 1942 1943 // This expression must be an integer type. 1944 if (!getType()->isIntegerType() || 1945 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1946 return false; 1947 1948 // If we have an integer constant expression, we need to *evaluate* it and 1949 // test for the value 0. 1950 llvm::APSInt Result; 1951 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1952} 1953 1954FieldDecl *Expr::getBitField() { 1955 Expr *E = this->IgnoreParens(); 1956 1957 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1958 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1959 E = ICE->getSubExpr()->IgnoreParens(); 1960 else 1961 break; 1962 } 1963 1964 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1965 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1966 if (Field->isBitField()) 1967 return Field; 1968 1969 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1970 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1971 return BinOp->getLHS()->getBitField(); 1972 1973 return 0; 1974} 1975 1976bool Expr::refersToVectorElement() const { 1977 const Expr *E = this->IgnoreParens(); 1978 1979 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1980 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1981 E = ICE->getSubExpr()->IgnoreParens(); 1982 else 1983 break; 1984 } 1985 1986 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 1987 return ASE->getBase()->getType()->isVectorType(); 1988 1989 if (isa<ExtVectorElementExpr>(E)) 1990 return true; 1991 1992 return false; 1993} 1994 1995/// isArrow - Return true if the base expression is a pointer to vector, 1996/// return false if the base expression is a vector. 1997bool ExtVectorElementExpr::isArrow() const { 1998 return getBase()->getType()->isPointerType(); 1999} 2000 2001unsigned ExtVectorElementExpr::getNumElements() const { 2002 if (const VectorType *VT = getType()->getAs<VectorType>()) 2003 return VT->getNumElements(); 2004 return 1; 2005} 2006 2007/// containsDuplicateElements - Return true if any element access is repeated. 2008bool ExtVectorElementExpr::containsDuplicateElements() const { 2009 // FIXME: Refactor this code to an accessor on the AST node which returns the 2010 // "type" of component access, and share with code below and in Sema. 2011 llvm::StringRef Comp = Accessor->getName(); 2012 2013 // Halving swizzles do not contain duplicate elements. 2014 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2015 return false; 2016 2017 // Advance past s-char prefix on hex swizzles. 2018 if (Comp[0] == 's' || Comp[0] == 'S') 2019 Comp = Comp.substr(1); 2020 2021 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2022 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2023 return true; 2024 2025 return false; 2026} 2027 2028/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2029void ExtVectorElementExpr::getEncodedElementAccess( 2030 llvm::SmallVectorImpl<unsigned> &Elts) const { 2031 llvm::StringRef Comp = Accessor->getName(); 2032 if (Comp[0] == 's' || Comp[0] == 'S') 2033 Comp = Comp.substr(1); 2034 2035 bool isHi = Comp == "hi"; 2036 bool isLo = Comp == "lo"; 2037 bool isEven = Comp == "even"; 2038 bool isOdd = Comp == "odd"; 2039 2040 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2041 uint64_t Index; 2042 2043 if (isHi) 2044 Index = e + i; 2045 else if (isLo) 2046 Index = i; 2047 else if (isEven) 2048 Index = 2 * i; 2049 else if (isOdd) 2050 Index = 2 * i + 1; 2051 else 2052 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2053 2054 Elts.push_back(Index); 2055 } 2056} 2057 2058// constructor for instance messages. 2059ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 2060 QualType retType, ObjCMethodDecl *mproto, 2061 SourceLocation LBrac, SourceLocation RBrac, 2062 Expr **ArgExprs, unsigned nargs) 2063 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2064 MethodProto(mproto) { 2065 NumArgs = nargs; 2066 SubExprs = new Stmt*[NumArgs+1]; 2067 SubExprs[RECEIVER] = receiver; 2068 if (NumArgs) { 2069 for (unsigned i = 0; i != NumArgs; ++i) 2070 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2071 } 2072 LBracloc = LBrac; 2073 RBracloc = RBrac; 2074} 2075 2076// constructor for class messages. 2077// FIXME: clsName should be typed to ObjCInterfaceType 2078ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 2079 QualType retType, ObjCMethodDecl *mproto, 2080 SourceLocation LBrac, SourceLocation RBrac, 2081 Expr **ArgExprs, unsigned nargs) 2082 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2083 MethodProto(mproto) { 2084 NumArgs = nargs; 2085 SubExprs = new Stmt*[NumArgs+1]; 2086 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2087 if (NumArgs) { 2088 for (unsigned i = 0; i != NumArgs; ++i) 2089 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2090 } 2091 LBracloc = LBrac; 2092 RBracloc = RBrac; 2093} 2094 2095// constructor for class messages. 2096ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2097 QualType retType, ObjCMethodDecl *mproto, 2098 SourceLocation LBrac, SourceLocation RBrac, 2099 Expr **ArgExprs, unsigned nargs) 2100: Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2101MethodProto(mproto) { 2102 NumArgs = nargs; 2103 SubExprs = new Stmt*[NumArgs+1]; 2104 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2105 if (NumArgs) { 2106 for (unsigned i = 0; i != NumArgs; ++i) 2107 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2108 } 2109 LBracloc = LBrac; 2110 RBracloc = RBrac; 2111} 2112 2113ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2114 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2115 switch (x & Flags) { 2116 default: 2117 assert(false && "Invalid ObjCMessageExpr."); 2118 case IsInstMeth: 2119 return ClassInfo(0, 0); 2120 case IsClsMethDeclUnknown: 2121 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2122 case IsClsMethDeclKnown: { 2123 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2124 return ClassInfo(D, D->getIdentifier()); 2125 } 2126 } 2127} 2128 2129void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2130 if (CI.first == 0 && CI.second == 0) 2131 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2132 else if (CI.first == 0) 2133 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2134 else 2135 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2136} 2137 2138 2139bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2140 return getCond()->EvaluateAsInt(C) != 0; 2141} 2142 2143void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2144 unsigned NumExprs) { 2145 if (SubExprs) C.Deallocate(SubExprs); 2146 2147 SubExprs = new (C) Stmt* [NumExprs]; 2148 this->NumExprs = NumExprs; 2149 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2150} 2151 2152void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2153 DestroyChildren(C); 2154 if (SubExprs) C.Deallocate(SubExprs); 2155 this->~ShuffleVectorExpr(); 2156 C.Deallocate(this); 2157} 2158 2159void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2160 // Override default behavior of traversing children. If this has a type 2161 // operand and the type is a variable-length array, the child iteration 2162 // will iterate over the size expression. However, this expression belongs 2163 // to the type, not to this, so we don't want to delete it. 2164 // We still want to delete this expression. 2165 if (isArgumentType()) { 2166 this->~SizeOfAlignOfExpr(); 2167 C.Deallocate(this); 2168 } 2169 else 2170 Expr::DoDestroy(C); 2171} 2172 2173//===----------------------------------------------------------------------===// 2174// DesignatedInitExpr 2175//===----------------------------------------------------------------------===// 2176 2177IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2178 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2179 if (Field.NameOrField & 0x01) 2180 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2181 else 2182 return getField()->getIdentifier(); 2183} 2184 2185DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2186 unsigned NumDesignators, 2187 const Designator *Designators, 2188 SourceLocation EqualOrColonLoc, 2189 bool GNUSyntax, 2190 Expr **IndexExprs, 2191 unsigned NumIndexExprs, 2192 Expr *Init) 2193 : Expr(DesignatedInitExprClass, Ty, 2194 Init->isTypeDependent(), Init->isValueDependent()), 2195 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2196 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2197 this->Designators = new (C) Designator[NumDesignators]; 2198 2199 // Record the initializer itself. 2200 child_iterator Child = child_begin(); 2201 *Child++ = Init; 2202 2203 // Copy the designators and their subexpressions, computing 2204 // value-dependence along the way. 2205 unsigned IndexIdx = 0; 2206 for (unsigned I = 0; I != NumDesignators; ++I) { 2207 this->Designators[I] = Designators[I]; 2208 2209 if (this->Designators[I].isArrayDesignator()) { 2210 // Compute type- and value-dependence. 2211 Expr *Index = IndexExprs[IndexIdx]; 2212 ValueDependent = ValueDependent || 2213 Index->isTypeDependent() || Index->isValueDependent(); 2214 2215 // Copy the index expressions into permanent storage. 2216 *Child++ = IndexExprs[IndexIdx++]; 2217 } else if (this->Designators[I].isArrayRangeDesignator()) { 2218 // Compute type- and value-dependence. 2219 Expr *Start = IndexExprs[IndexIdx]; 2220 Expr *End = IndexExprs[IndexIdx + 1]; 2221 ValueDependent = ValueDependent || 2222 Start->isTypeDependent() || Start->isValueDependent() || 2223 End->isTypeDependent() || End->isValueDependent(); 2224 2225 // Copy the start/end expressions into permanent storage. 2226 *Child++ = IndexExprs[IndexIdx++]; 2227 *Child++ = IndexExprs[IndexIdx++]; 2228 } 2229 } 2230 2231 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2232} 2233 2234DesignatedInitExpr * 2235DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2236 unsigned NumDesignators, 2237 Expr **IndexExprs, unsigned NumIndexExprs, 2238 SourceLocation ColonOrEqualLoc, 2239 bool UsesColonSyntax, Expr *Init) { 2240 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2241 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2242 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2243 ColonOrEqualLoc, UsesColonSyntax, 2244 IndexExprs, NumIndexExprs, Init); 2245} 2246 2247DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2248 unsigned NumIndexExprs) { 2249 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2250 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2251 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2252} 2253 2254void DesignatedInitExpr::setDesignators(ASTContext &C, 2255 const Designator *Desigs, 2256 unsigned NumDesigs) { 2257 DestroyDesignators(C); 2258 2259 Designators = new (C) Designator[NumDesigs]; 2260 NumDesignators = NumDesigs; 2261 for (unsigned I = 0; I != NumDesigs; ++I) 2262 Designators[I] = Desigs[I]; 2263} 2264 2265SourceRange DesignatedInitExpr::getSourceRange() const { 2266 SourceLocation StartLoc; 2267 Designator &First = 2268 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2269 if (First.isFieldDesignator()) { 2270 if (GNUSyntax) 2271 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2272 else 2273 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2274 } else 2275 StartLoc = 2276 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2277 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2278} 2279 2280Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2281 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2282 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2283 Ptr += sizeof(DesignatedInitExpr); 2284 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2285 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2286} 2287 2288Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2289 assert(D.Kind == Designator::ArrayRangeDesignator && 2290 "Requires array range designator"); 2291 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2292 Ptr += sizeof(DesignatedInitExpr); 2293 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2294 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2295} 2296 2297Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2298 assert(D.Kind == Designator::ArrayRangeDesignator && 2299 "Requires array range designator"); 2300 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2301 Ptr += sizeof(DesignatedInitExpr); 2302 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2303 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2304} 2305 2306/// \brief Replaces the designator at index @p Idx with the series 2307/// of designators in [First, Last). 2308void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2309 const Designator *First, 2310 const Designator *Last) { 2311 unsigned NumNewDesignators = Last - First; 2312 if (NumNewDesignators == 0) { 2313 std::copy_backward(Designators + Idx + 1, 2314 Designators + NumDesignators, 2315 Designators + Idx); 2316 --NumNewDesignators; 2317 return; 2318 } else if (NumNewDesignators == 1) { 2319 Designators[Idx] = *First; 2320 return; 2321 } 2322 2323 Designator *NewDesignators 2324 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2325 std::copy(Designators, Designators + Idx, NewDesignators); 2326 std::copy(First, Last, NewDesignators + Idx); 2327 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2328 NewDesignators + Idx + NumNewDesignators); 2329 DestroyDesignators(C); 2330 Designators = NewDesignators; 2331 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2332} 2333 2334void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2335 DestroyDesignators(C); 2336 Expr::DoDestroy(C); 2337} 2338 2339void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2340 for (unsigned I = 0; I != NumDesignators; ++I) 2341 Designators[I].~Designator(); 2342 C.Deallocate(Designators); 2343 Designators = 0; 2344} 2345 2346ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2347 Expr **exprs, unsigned nexprs, 2348 SourceLocation rparenloc) 2349: Expr(ParenListExprClass, QualType(), 2350 hasAnyTypeDependentArguments(exprs, nexprs), 2351 hasAnyValueDependentArguments(exprs, nexprs)), 2352 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2353 2354 Exprs = new (C) Stmt*[nexprs]; 2355 for (unsigned i = 0; i != nexprs; ++i) 2356 Exprs[i] = exprs[i]; 2357} 2358 2359void ParenListExpr::DoDestroy(ASTContext& C) { 2360 DestroyChildren(C); 2361 if (Exprs) C.Deallocate(Exprs); 2362 this->~ParenListExpr(); 2363 C.Deallocate(this); 2364} 2365 2366//===----------------------------------------------------------------------===// 2367// ExprIterator. 2368//===----------------------------------------------------------------------===// 2369 2370Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2371Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2372Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2373const Expr* ConstExprIterator::operator[](size_t idx) const { 2374 return cast<Expr>(I[idx]); 2375} 2376const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2377const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2378 2379//===----------------------------------------------------------------------===// 2380// Child Iterators for iterating over subexpressions/substatements 2381//===----------------------------------------------------------------------===// 2382 2383// DeclRefExpr 2384Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2385Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2386 2387// ObjCIvarRefExpr 2388Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2389Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2390 2391// ObjCPropertyRefExpr 2392Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2393Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2394 2395// ObjCImplicitSetterGetterRefExpr 2396Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2397 return &Base; 2398} 2399Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2400 return &Base+1; 2401} 2402 2403// ObjCSuperExpr 2404Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2405Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2406 2407// ObjCIsaExpr 2408Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2409Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2410 2411// PredefinedExpr 2412Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2413Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2414 2415// IntegerLiteral 2416Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2417Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2418 2419// CharacterLiteral 2420Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2421Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2422 2423// FloatingLiteral 2424Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2425Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2426 2427// ImaginaryLiteral 2428Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2429Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2430 2431// StringLiteral 2432Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2433Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2434 2435// ParenExpr 2436Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2437Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2438 2439// UnaryOperator 2440Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2441Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2442 2443// SizeOfAlignOfExpr 2444Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2445 // If this is of a type and the type is a VLA type (and not a typedef), the 2446 // size expression of the VLA needs to be treated as an executable expression. 2447 // Why isn't this weirdness documented better in StmtIterator? 2448 if (isArgumentType()) { 2449 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2450 getArgumentType().getTypePtr())) 2451 return child_iterator(T); 2452 return child_iterator(); 2453 } 2454 return child_iterator(&Argument.Ex); 2455} 2456Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2457 if (isArgumentType()) 2458 return child_iterator(); 2459 return child_iterator(&Argument.Ex + 1); 2460} 2461 2462// ArraySubscriptExpr 2463Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2464 return &SubExprs[0]; 2465} 2466Stmt::child_iterator ArraySubscriptExpr::child_end() { 2467 return &SubExprs[0]+END_EXPR; 2468} 2469 2470// CallExpr 2471Stmt::child_iterator CallExpr::child_begin() { 2472 return &SubExprs[0]; 2473} 2474Stmt::child_iterator CallExpr::child_end() { 2475 return &SubExprs[0]+NumArgs+ARGS_START; 2476} 2477 2478// MemberExpr 2479Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2480Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2481 2482// ExtVectorElementExpr 2483Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2484Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2485 2486// CompoundLiteralExpr 2487Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2488Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2489 2490// CastExpr 2491Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2492Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2493 2494// BinaryOperator 2495Stmt::child_iterator BinaryOperator::child_begin() { 2496 return &SubExprs[0]; 2497} 2498Stmt::child_iterator BinaryOperator::child_end() { 2499 return &SubExprs[0]+END_EXPR; 2500} 2501 2502// ConditionalOperator 2503Stmt::child_iterator ConditionalOperator::child_begin() { 2504 return &SubExprs[0]; 2505} 2506Stmt::child_iterator ConditionalOperator::child_end() { 2507 return &SubExprs[0]+END_EXPR; 2508} 2509 2510// AddrLabelExpr 2511Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2512Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2513 2514// StmtExpr 2515Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2516Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2517 2518// TypesCompatibleExpr 2519Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2520 return child_iterator(); 2521} 2522 2523Stmt::child_iterator TypesCompatibleExpr::child_end() { 2524 return child_iterator(); 2525} 2526 2527// ChooseExpr 2528Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2529Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2530 2531// GNUNullExpr 2532Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2533Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2534 2535// ShuffleVectorExpr 2536Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2537 return &SubExprs[0]; 2538} 2539Stmt::child_iterator ShuffleVectorExpr::child_end() { 2540 return &SubExprs[0]+NumExprs; 2541} 2542 2543// VAArgExpr 2544Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2545Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2546 2547// InitListExpr 2548Stmt::child_iterator InitListExpr::child_begin() { 2549 return InitExprs.size() ? &InitExprs[0] : 0; 2550} 2551Stmt::child_iterator InitListExpr::child_end() { 2552 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2553} 2554 2555// DesignatedInitExpr 2556Stmt::child_iterator DesignatedInitExpr::child_begin() { 2557 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2558 Ptr += sizeof(DesignatedInitExpr); 2559 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2560} 2561Stmt::child_iterator DesignatedInitExpr::child_end() { 2562 return child_iterator(&*child_begin() + NumSubExprs); 2563} 2564 2565// ImplicitValueInitExpr 2566Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2567 return child_iterator(); 2568} 2569 2570Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2571 return child_iterator(); 2572} 2573 2574// ParenListExpr 2575Stmt::child_iterator ParenListExpr::child_begin() { 2576 return &Exprs[0]; 2577} 2578Stmt::child_iterator ParenListExpr::child_end() { 2579 return &Exprs[0]+NumExprs; 2580} 2581 2582// ObjCStringLiteral 2583Stmt::child_iterator ObjCStringLiteral::child_begin() { 2584 return &String; 2585} 2586Stmt::child_iterator ObjCStringLiteral::child_end() { 2587 return &String+1; 2588} 2589 2590// ObjCEncodeExpr 2591Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2592Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2593 2594// ObjCSelectorExpr 2595Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2596 return child_iterator(); 2597} 2598Stmt::child_iterator ObjCSelectorExpr::child_end() { 2599 return child_iterator(); 2600} 2601 2602// ObjCProtocolExpr 2603Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2604 return child_iterator(); 2605} 2606Stmt::child_iterator ObjCProtocolExpr::child_end() { 2607 return child_iterator(); 2608} 2609 2610// ObjCMessageExpr 2611Stmt::child_iterator ObjCMessageExpr::child_begin() { 2612 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2613} 2614Stmt::child_iterator ObjCMessageExpr::child_end() { 2615 return &SubExprs[0]+ARGS_START+getNumArgs(); 2616} 2617 2618// Blocks 2619Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2620Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2621 2622Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2623Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2624