Expr.cpp revision c0c30b203cd1e17a8688d3719e3ac7400f758709
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// Primary Expressions. 32//===----------------------------------------------------------------------===// 33 34void ExplicitTemplateArgumentList::initializeFrom( 35 const TemplateArgumentListInfo &Info) { 36 LAngleLoc = Info.getLAngleLoc(); 37 RAngleLoc = Info.getRAngleLoc(); 38 NumTemplateArgs = Info.size(); 39 40 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 41 for (unsigned i = 0; i != NumTemplateArgs; ++i) 42 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 43} 44 45void ExplicitTemplateArgumentList::copyInto( 46 TemplateArgumentListInfo &Info) const { 47 Info.setLAngleLoc(LAngleLoc); 48 Info.setRAngleLoc(RAngleLoc); 49 for (unsigned I = 0; I != NumTemplateArgs; ++I) 50 Info.addArgument(getTemplateArgs()[I]); 51} 52 53std::size_t ExplicitTemplateArgumentList::sizeFor( 54 const TemplateArgumentListInfo &Info) { 55 return sizeof(ExplicitTemplateArgumentList) + 56 sizeof(TemplateArgumentLoc) * Info.size(); 57} 58 59void DeclRefExpr::computeDependence() { 60 TypeDependent = false; 61 ValueDependent = false; 62 63 NamedDecl *D = getDecl(); 64 65 // (TD) C++ [temp.dep.expr]p3: 66 // An id-expression is type-dependent if it contains: 67 // 68 // and 69 // 70 // (VD) C++ [temp.dep.constexpr]p2: 71 // An identifier is value-dependent if it is: 72 73 // (TD) - an identifier that was declared with dependent type 74 // (VD) - a name declared with a dependent type, 75 if (getType()->isDependentType()) { 76 TypeDependent = true; 77 ValueDependent = true; 78 } 79 // (TD) - a conversion-function-id that specifies a dependent type 80 else if (D->getDeclName().getNameKind() 81 == DeclarationName::CXXConversionFunctionName && 82 D->getDeclName().getCXXNameType()->isDependentType()) { 83 TypeDependent = true; 84 ValueDependent = true; 85 } 86 // (TD) - a template-id that is dependent, 87 else if (hasExplicitTemplateArgumentList() && 88 TemplateSpecializationType::anyDependentTemplateArguments( 89 getTemplateArgs(), 90 getNumTemplateArgs())) { 91 TypeDependent = true; 92 ValueDependent = true; 93 } 94 // (VD) - the name of a non-type template parameter, 95 else if (isa<NonTypeTemplateParmDecl>(D)) 96 ValueDependent = true; 97 // (VD) - a constant with integral or enumeration type and is 98 // initialized with an expression that is value-dependent. 99 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 100 if (Var->getType()->isIntegralType() && 101 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 102 if (const Expr *Init = Var->getAnyInitializer()) 103 if (Init->isValueDependent()) 104 ValueDependent = true; 105 } 106 } 107 // (TD) - a nested-name-specifier or a qualified-id that names a 108 // member of an unknown specialization. 109 // (handled by DependentScopeDeclRefExpr) 110} 111 112DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 113 SourceRange QualifierRange, 114 ValueDecl *D, SourceLocation NameLoc, 115 const TemplateArgumentListInfo *TemplateArgs, 116 QualType T) 117 : Expr(DeclRefExprClass, T, false, false), 118 DecoratedD(D, 119 (Qualifier? HasQualifierFlag : 0) | 120 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 121 Loc(NameLoc) { 122 if (Qualifier) { 123 NameQualifier *NQ = getNameQualifier(); 124 NQ->NNS = Qualifier; 125 NQ->Range = QualifierRange; 126 } 127 128 if (TemplateArgs) 129 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 130 131 computeDependence(); 132} 133 134DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 135 NestedNameSpecifier *Qualifier, 136 SourceRange QualifierRange, 137 ValueDecl *D, 138 SourceLocation NameLoc, 139 QualType T, 140 const TemplateArgumentListInfo *TemplateArgs) { 141 std::size_t Size = sizeof(DeclRefExpr); 142 if (Qualifier != 0) 143 Size += sizeof(NameQualifier); 144 145 if (TemplateArgs) 146 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 147 148 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 149 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 150 TemplateArgs, T); 151} 152 153SourceRange DeclRefExpr::getSourceRange() const { 154 // FIXME: Does not handle multi-token names well, e.g., operator[]. 155 SourceRange R(Loc); 156 157 if (hasQualifier()) 158 R.setBegin(getQualifierRange().getBegin()); 159 if (hasExplicitTemplateArgumentList()) 160 R.setEnd(getRAngleLoc()); 161 return R; 162} 163 164// FIXME: Maybe this should use DeclPrinter with a special "print predefined 165// expr" policy instead. 166std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 167 ASTContext &Context = CurrentDecl->getASTContext(); 168 169 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 170 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 171 return FD->getNameAsString(); 172 173 llvm::SmallString<256> Name; 174 llvm::raw_svector_ostream Out(Name); 175 176 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 177 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 178 Out << "virtual "; 179 if (MD->isStatic()) 180 Out << "static "; 181 } 182 183 PrintingPolicy Policy(Context.getLangOptions()); 184 Policy.SuppressTagKind = true; 185 186 std::string Proto = FD->getQualifiedNameAsString(Policy); 187 188 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 189 const FunctionProtoType *FT = 0; 190 if (FD->hasWrittenPrototype()) 191 FT = dyn_cast<FunctionProtoType>(AFT); 192 193 Proto += "("; 194 if (FT) { 195 llvm::raw_string_ostream POut(Proto); 196 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 197 if (i) POut << ", "; 198 std::string Param; 199 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 200 POut << Param; 201 } 202 203 if (FT->isVariadic()) { 204 if (FD->getNumParams()) POut << ", "; 205 POut << "..."; 206 } 207 } 208 Proto += ")"; 209 210 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 211 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 212 if (ThisQuals.hasConst()) 213 Proto += " const"; 214 if (ThisQuals.hasVolatile()) 215 Proto += " volatile"; 216 } 217 218 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 219 AFT->getResultType().getAsStringInternal(Proto, Policy); 220 221 Out << Proto; 222 223 Out.flush(); 224 return Name.str().str(); 225 } 226 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 227 llvm::SmallString<256> Name; 228 llvm::raw_svector_ostream Out(Name); 229 Out << (MD->isInstanceMethod() ? '-' : '+'); 230 Out << '['; 231 Out << MD->getClassInterface()->getNameAsString(); 232 if (const ObjCCategoryImplDecl *CID = 233 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 234 Out << '('; 235 Out << CID->getNameAsString(); 236 Out << ')'; 237 } 238 Out << ' '; 239 Out << MD->getSelector().getAsString(); 240 Out << ']'; 241 242 Out.flush(); 243 return Name.str().str(); 244 } 245 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 246 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 247 return "top level"; 248 } 249 return ""; 250} 251 252/// getValueAsApproximateDouble - This returns the value as an inaccurate 253/// double. Note that this may cause loss of precision, but is useful for 254/// debugging dumps, etc. 255double FloatingLiteral::getValueAsApproximateDouble() const { 256 llvm::APFloat V = getValue(); 257 bool ignored; 258 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 259 &ignored); 260 return V.convertToDouble(); 261} 262 263StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 264 unsigned ByteLength, bool Wide, 265 QualType Ty, 266 const SourceLocation *Loc, 267 unsigned NumStrs) { 268 // Allocate enough space for the StringLiteral plus an array of locations for 269 // any concatenated string tokens. 270 void *Mem = C.Allocate(sizeof(StringLiteral)+ 271 sizeof(SourceLocation)*(NumStrs-1), 272 llvm::alignof<StringLiteral>()); 273 StringLiteral *SL = new (Mem) StringLiteral(Ty); 274 275 // OPTIMIZE: could allocate this appended to the StringLiteral. 276 char *AStrData = new (C, 1) char[ByteLength]; 277 memcpy(AStrData, StrData, ByteLength); 278 SL->StrData = AStrData; 279 SL->ByteLength = ByteLength; 280 SL->IsWide = Wide; 281 SL->TokLocs[0] = Loc[0]; 282 SL->NumConcatenated = NumStrs; 283 284 if (NumStrs != 1) 285 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 286 return SL; 287} 288 289StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 290 void *Mem = C.Allocate(sizeof(StringLiteral)+ 291 sizeof(SourceLocation)*(NumStrs-1), 292 llvm::alignof<StringLiteral>()); 293 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 294 SL->StrData = 0; 295 SL->ByteLength = 0; 296 SL->NumConcatenated = NumStrs; 297 return SL; 298} 299 300void StringLiteral::DoDestroy(ASTContext &C) { 301 C.Deallocate(const_cast<char*>(StrData)); 302 Expr::DoDestroy(C); 303} 304 305void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 306 if (StrData) 307 C.Deallocate(const_cast<char*>(StrData)); 308 309 char *AStrData = new (C, 1) char[Str.size()]; 310 memcpy(AStrData, Str.data(), Str.size()); 311 StrData = AStrData; 312 ByteLength = Str.size(); 313} 314 315/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 316/// corresponds to, e.g. "sizeof" or "[pre]++". 317const char *UnaryOperator::getOpcodeStr(Opcode Op) { 318 switch (Op) { 319 default: assert(0 && "Unknown unary operator"); 320 case PostInc: return "++"; 321 case PostDec: return "--"; 322 case PreInc: return "++"; 323 case PreDec: return "--"; 324 case AddrOf: return "&"; 325 case Deref: return "*"; 326 case Plus: return "+"; 327 case Minus: return "-"; 328 case Not: return "~"; 329 case LNot: return "!"; 330 case Real: return "__real"; 331 case Imag: return "__imag"; 332 case Extension: return "__extension__"; 333 case OffsetOf: return "__builtin_offsetof"; 334 } 335} 336 337UnaryOperator::Opcode 338UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 339 switch (OO) { 340 default: assert(false && "No unary operator for overloaded function"); 341 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 342 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 343 case OO_Amp: return AddrOf; 344 case OO_Star: return Deref; 345 case OO_Plus: return Plus; 346 case OO_Minus: return Minus; 347 case OO_Tilde: return Not; 348 case OO_Exclaim: return LNot; 349 } 350} 351 352OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 353 switch (Opc) { 354 case PostInc: case PreInc: return OO_PlusPlus; 355 case PostDec: case PreDec: return OO_MinusMinus; 356 case AddrOf: return OO_Amp; 357 case Deref: return OO_Star; 358 case Plus: return OO_Plus; 359 case Minus: return OO_Minus; 360 case Not: return OO_Tilde; 361 case LNot: return OO_Exclaim; 362 default: return OO_None; 363 } 364} 365 366 367//===----------------------------------------------------------------------===// 368// Postfix Operators. 369//===----------------------------------------------------------------------===// 370 371CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 372 unsigned numargs, QualType t, SourceLocation rparenloc) 373 : Expr(SC, t, 374 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 375 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 376 NumArgs(numargs) { 377 378 SubExprs = new (C) Stmt*[numargs+1]; 379 SubExprs[FN] = fn; 380 for (unsigned i = 0; i != numargs; ++i) 381 SubExprs[i+ARGS_START] = args[i]; 382 383 RParenLoc = rparenloc; 384} 385 386CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 387 QualType t, SourceLocation rparenloc) 388 : Expr(CallExprClass, t, 389 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 390 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 391 NumArgs(numargs) { 392 393 SubExprs = new (C) Stmt*[numargs+1]; 394 SubExprs[FN] = fn; 395 for (unsigned i = 0; i != numargs; ++i) 396 SubExprs[i+ARGS_START] = args[i]; 397 398 RParenLoc = rparenloc; 399} 400 401CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 402 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 403 SubExprs = new (C) Stmt*[1]; 404} 405 406void CallExpr::DoDestroy(ASTContext& C) { 407 DestroyChildren(C); 408 if (SubExprs) C.Deallocate(SubExprs); 409 this->~CallExpr(); 410 C.Deallocate(this); 411} 412 413Decl *CallExpr::getCalleeDecl() { 414 Expr *CEE = getCallee()->IgnoreParenCasts(); 415 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 416 return DRE->getDecl(); 417 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 418 return ME->getMemberDecl(); 419 420 return 0; 421} 422 423FunctionDecl *CallExpr::getDirectCallee() { 424 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 425} 426 427/// setNumArgs - This changes the number of arguments present in this call. 428/// Any orphaned expressions are deleted by this, and any new operands are set 429/// to null. 430void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 431 // No change, just return. 432 if (NumArgs == getNumArgs()) return; 433 434 // If shrinking # arguments, just delete the extras and forgot them. 435 if (NumArgs < getNumArgs()) { 436 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 437 getArg(i)->Destroy(C); 438 this->NumArgs = NumArgs; 439 return; 440 } 441 442 // Otherwise, we are growing the # arguments. New an bigger argument array. 443 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 444 // Copy over args. 445 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 446 NewSubExprs[i] = SubExprs[i]; 447 // Null out new args. 448 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 449 NewSubExprs[i] = 0; 450 451 if (SubExprs) C.Deallocate(SubExprs); 452 SubExprs = NewSubExprs; 453 this->NumArgs = NumArgs; 454} 455 456/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 457/// not, return 0. 458unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 459 // All simple function calls (e.g. func()) are implicitly cast to pointer to 460 // function. As a result, we try and obtain the DeclRefExpr from the 461 // ImplicitCastExpr. 462 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 463 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 464 return 0; 465 466 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 467 if (!DRE) 468 return 0; 469 470 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 471 if (!FDecl) 472 return 0; 473 474 if (!FDecl->getIdentifier()) 475 return 0; 476 477 return FDecl->getBuiltinID(); 478} 479 480QualType CallExpr::getCallReturnType() const { 481 QualType CalleeType = getCallee()->getType(); 482 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 483 CalleeType = FnTypePtr->getPointeeType(); 484 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 485 CalleeType = BPT->getPointeeType(); 486 487 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 488 return FnType->getResultType(); 489} 490 491MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 492 SourceRange qualrange, ValueDecl *memberdecl, 493 SourceLocation l, const TemplateArgumentListInfo *targs, 494 QualType ty) 495 : Expr(MemberExprClass, ty, 496 base->isTypeDependent() || (qual && qual->isDependent()), 497 base->isValueDependent() || (qual && qual->isDependent())), 498 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 499 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 500 // Initialize the qualifier, if any. 501 if (HasQualifier) { 502 NameQualifier *NQ = getMemberQualifier(); 503 NQ->NNS = qual; 504 NQ->Range = qualrange; 505 } 506 507 // Initialize the explicit template argument list, if any. 508 if (targs) 509 getExplicitTemplateArgumentList()->initializeFrom(*targs); 510} 511 512MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 513 NestedNameSpecifier *qual, 514 SourceRange qualrange, 515 ValueDecl *memberdecl, 516 SourceLocation l, 517 const TemplateArgumentListInfo *targs, 518 QualType ty) { 519 std::size_t Size = sizeof(MemberExpr); 520 if (qual != 0) 521 Size += sizeof(NameQualifier); 522 523 if (targs) 524 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 525 526 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 527 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 528 targs, ty); 529} 530 531const char *CastExpr::getCastKindName() const { 532 switch (getCastKind()) { 533 case CastExpr::CK_Unknown: 534 return "Unknown"; 535 case CastExpr::CK_BitCast: 536 return "BitCast"; 537 case CastExpr::CK_NoOp: 538 return "NoOp"; 539 case CastExpr::CK_BaseToDerived: 540 return "BaseToDerived"; 541 case CastExpr::CK_DerivedToBase: 542 return "DerivedToBase"; 543 case CastExpr::CK_Dynamic: 544 return "Dynamic"; 545 case CastExpr::CK_ToUnion: 546 return "ToUnion"; 547 case CastExpr::CK_ArrayToPointerDecay: 548 return "ArrayToPointerDecay"; 549 case CastExpr::CK_FunctionToPointerDecay: 550 return "FunctionToPointerDecay"; 551 case CastExpr::CK_NullToMemberPointer: 552 return "NullToMemberPointer"; 553 case CastExpr::CK_BaseToDerivedMemberPointer: 554 return "BaseToDerivedMemberPointer"; 555 case CastExpr::CK_DerivedToBaseMemberPointer: 556 return "DerivedToBaseMemberPointer"; 557 case CastExpr::CK_UserDefinedConversion: 558 return "UserDefinedConversion"; 559 case CastExpr::CK_ConstructorConversion: 560 return "ConstructorConversion"; 561 case CastExpr::CK_IntegralToPointer: 562 return "IntegralToPointer"; 563 case CastExpr::CK_PointerToIntegral: 564 return "PointerToIntegral"; 565 case CastExpr::CK_ToVoid: 566 return "ToVoid"; 567 case CastExpr::CK_VectorSplat: 568 return "VectorSplat"; 569 case CastExpr::CK_IntegralCast: 570 return "IntegralCast"; 571 case CastExpr::CK_IntegralToFloating: 572 return "IntegralToFloating"; 573 case CastExpr::CK_FloatingToIntegral: 574 return "FloatingToIntegral"; 575 case CastExpr::CK_FloatingCast: 576 return "FloatingCast"; 577 case CastExpr::CK_MemberPointerToBoolean: 578 return "MemberPointerToBoolean"; 579 case CastExpr::CK_AnyPointerToObjCPointerCast: 580 return "AnyPointerToObjCPointerCast"; 581 case CastExpr::CK_AnyPointerToBlockPointerCast: 582 return "AnyPointerToBlockPointerCast"; 583 } 584 585 assert(0 && "Unhandled cast kind!"); 586 return 0; 587} 588 589Expr *CastExpr::getSubExprAsWritten() { 590 Expr *SubExpr = 0; 591 CastExpr *E = this; 592 do { 593 SubExpr = E->getSubExpr(); 594 595 // Skip any temporary bindings; they're implicit. 596 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 597 SubExpr = Binder->getSubExpr(); 598 599 // Conversions by constructor and conversion functions have a 600 // subexpression describing the call; strip it off. 601 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 602 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 603 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 604 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 605 606 // If the subexpression we're left with is an implicit cast, look 607 // through that, too. 608 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 609 610 return SubExpr; 611} 612 613/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 614/// corresponds to, e.g. "<<=". 615const char *BinaryOperator::getOpcodeStr(Opcode Op) { 616 switch (Op) { 617 case PtrMemD: return ".*"; 618 case PtrMemI: return "->*"; 619 case Mul: return "*"; 620 case Div: return "/"; 621 case Rem: return "%"; 622 case Add: return "+"; 623 case Sub: return "-"; 624 case Shl: return "<<"; 625 case Shr: return ">>"; 626 case LT: return "<"; 627 case GT: return ">"; 628 case LE: return "<="; 629 case GE: return ">="; 630 case EQ: return "=="; 631 case NE: return "!="; 632 case And: return "&"; 633 case Xor: return "^"; 634 case Or: return "|"; 635 case LAnd: return "&&"; 636 case LOr: return "||"; 637 case Assign: return "="; 638 case MulAssign: return "*="; 639 case DivAssign: return "/="; 640 case RemAssign: return "%="; 641 case AddAssign: return "+="; 642 case SubAssign: return "-="; 643 case ShlAssign: return "<<="; 644 case ShrAssign: return ">>="; 645 case AndAssign: return "&="; 646 case XorAssign: return "^="; 647 case OrAssign: return "|="; 648 case Comma: return ","; 649 } 650 651 return ""; 652} 653 654BinaryOperator::Opcode 655BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 656 switch (OO) { 657 default: assert(false && "Not an overloadable binary operator"); 658 case OO_Plus: return Add; 659 case OO_Minus: return Sub; 660 case OO_Star: return Mul; 661 case OO_Slash: return Div; 662 case OO_Percent: return Rem; 663 case OO_Caret: return Xor; 664 case OO_Amp: return And; 665 case OO_Pipe: return Or; 666 case OO_Equal: return Assign; 667 case OO_Less: return LT; 668 case OO_Greater: return GT; 669 case OO_PlusEqual: return AddAssign; 670 case OO_MinusEqual: return SubAssign; 671 case OO_StarEqual: return MulAssign; 672 case OO_SlashEqual: return DivAssign; 673 case OO_PercentEqual: return RemAssign; 674 case OO_CaretEqual: return XorAssign; 675 case OO_AmpEqual: return AndAssign; 676 case OO_PipeEqual: return OrAssign; 677 case OO_LessLess: return Shl; 678 case OO_GreaterGreater: return Shr; 679 case OO_LessLessEqual: return ShlAssign; 680 case OO_GreaterGreaterEqual: return ShrAssign; 681 case OO_EqualEqual: return EQ; 682 case OO_ExclaimEqual: return NE; 683 case OO_LessEqual: return LE; 684 case OO_GreaterEqual: return GE; 685 case OO_AmpAmp: return LAnd; 686 case OO_PipePipe: return LOr; 687 case OO_Comma: return Comma; 688 case OO_ArrowStar: return PtrMemI; 689 } 690} 691 692OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 693 static const OverloadedOperatorKind OverOps[] = { 694 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 695 OO_Star, OO_Slash, OO_Percent, 696 OO_Plus, OO_Minus, 697 OO_LessLess, OO_GreaterGreater, 698 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 699 OO_EqualEqual, OO_ExclaimEqual, 700 OO_Amp, 701 OO_Caret, 702 OO_Pipe, 703 OO_AmpAmp, 704 OO_PipePipe, 705 OO_Equal, OO_StarEqual, 706 OO_SlashEqual, OO_PercentEqual, 707 OO_PlusEqual, OO_MinusEqual, 708 OO_LessLessEqual, OO_GreaterGreaterEqual, 709 OO_AmpEqual, OO_CaretEqual, 710 OO_PipeEqual, 711 OO_Comma 712 }; 713 return OverOps[Opc]; 714} 715 716InitListExpr::InitListExpr(SourceLocation lbraceloc, 717 Expr **initExprs, unsigned numInits, 718 SourceLocation rbraceloc) 719 : Expr(InitListExprClass, QualType(), false, false), 720 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 721 UnionFieldInit(0), HadArrayRangeDesignator(false) 722{ 723 for (unsigned I = 0; I != numInits; ++I) { 724 if (initExprs[I]->isTypeDependent()) 725 TypeDependent = true; 726 if (initExprs[I]->isValueDependent()) 727 ValueDependent = true; 728 } 729 730 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 731} 732 733void InitListExpr::reserveInits(unsigned NumInits) { 734 if (NumInits > InitExprs.size()) 735 InitExprs.reserve(NumInits); 736} 737 738void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 739 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 740 Idx < LastIdx; ++Idx) 741 InitExprs[Idx]->Destroy(Context); 742 InitExprs.resize(NumInits, 0); 743} 744 745Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 746 if (Init >= InitExprs.size()) { 747 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 748 InitExprs.back() = expr; 749 return 0; 750 } 751 752 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 753 InitExprs[Init] = expr; 754 return Result; 755} 756 757/// getFunctionType - Return the underlying function type for this block. 758/// 759const FunctionType *BlockExpr::getFunctionType() const { 760 return getType()->getAs<BlockPointerType>()-> 761 getPointeeType()->getAs<FunctionType>(); 762} 763 764SourceLocation BlockExpr::getCaretLocation() const { 765 return TheBlock->getCaretLocation(); 766} 767const Stmt *BlockExpr::getBody() const { 768 return TheBlock->getBody(); 769} 770Stmt *BlockExpr::getBody() { 771 return TheBlock->getBody(); 772} 773 774 775//===----------------------------------------------------------------------===// 776// Generic Expression Routines 777//===----------------------------------------------------------------------===// 778 779/// isUnusedResultAWarning - Return true if this immediate expression should 780/// be warned about if the result is unused. If so, fill in Loc and Ranges 781/// with location to warn on and the source range[s] to report with the 782/// warning. 783bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 784 SourceRange &R2, ASTContext &Ctx) const { 785 // Don't warn if the expr is type dependent. The type could end up 786 // instantiating to void. 787 if (isTypeDependent()) 788 return false; 789 790 switch (getStmtClass()) { 791 default: 792 Loc = getExprLoc(); 793 R1 = getSourceRange(); 794 return true; 795 case ParenExprClass: 796 return cast<ParenExpr>(this)->getSubExpr()-> 797 isUnusedResultAWarning(Loc, R1, R2, Ctx); 798 case UnaryOperatorClass: { 799 const UnaryOperator *UO = cast<UnaryOperator>(this); 800 801 switch (UO->getOpcode()) { 802 default: break; 803 case UnaryOperator::PostInc: 804 case UnaryOperator::PostDec: 805 case UnaryOperator::PreInc: 806 case UnaryOperator::PreDec: // ++/-- 807 return false; // Not a warning. 808 case UnaryOperator::Deref: 809 // Dereferencing a volatile pointer is a side-effect. 810 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 811 return false; 812 break; 813 case UnaryOperator::Real: 814 case UnaryOperator::Imag: 815 // accessing a piece of a volatile complex is a side-effect. 816 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 817 .isVolatileQualified()) 818 return false; 819 break; 820 case UnaryOperator::Extension: 821 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 822 } 823 Loc = UO->getOperatorLoc(); 824 R1 = UO->getSubExpr()->getSourceRange(); 825 return true; 826 } 827 case BinaryOperatorClass: { 828 const BinaryOperator *BO = cast<BinaryOperator>(this); 829 // Consider comma to have side effects if the LHS or RHS does. 830 if (BO->getOpcode() == BinaryOperator::Comma) 831 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 832 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 833 834 if (BO->isAssignmentOp()) 835 return false; 836 Loc = BO->getOperatorLoc(); 837 R1 = BO->getLHS()->getSourceRange(); 838 R2 = BO->getRHS()->getSourceRange(); 839 return true; 840 } 841 case CompoundAssignOperatorClass: 842 return false; 843 844 case ConditionalOperatorClass: { 845 // The condition must be evaluated, but if either the LHS or RHS is a 846 // warning, warn about them. 847 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 848 if (Exp->getLHS() && 849 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 850 return true; 851 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 852 } 853 854 case MemberExprClass: 855 // If the base pointer or element is to a volatile pointer/field, accessing 856 // it is a side effect. 857 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 858 return false; 859 Loc = cast<MemberExpr>(this)->getMemberLoc(); 860 R1 = SourceRange(Loc, Loc); 861 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 862 return true; 863 864 case ArraySubscriptExprClass: 865 // If the base pointer or element is to a volatile pointer/field, accessing 866 // it is a side effect. 867 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 868 return false; 869 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 870 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 871 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 872 return true; 873 874 case CallExprClass: 875 case CXXOperatorCallExprClass: 876 case CXXMemberCallExprClass: { 877 // If this is a direct call, get the callee. 878 const CallExpr *CE = cast<CallExpr>(this); 879 if (const Decl *FD = CE->getCalleeDecl()) { 880 // If the callee has attribute pure, const, or warn_unused_result, warn 881 // about it. void foo() { strlen("bar"); } should warn. 882 // 883 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 884 // updated to match for QoI. 885 if (FD->getAttr<WarnUnusedResultAttr>() || 886 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 887 Loc = CE->getCallee()->getLocStart(); 888 R1 = CE->getCallee()->getSourceRange(); 889 890 if (unsigned NumArgs = CE->getNumArgs()) 891 R2 = SourceRange(CE->getArg(0)->getLocStart(), 892 CE->getArg(NumArgs-1)->getLocEnd()); 893 return true; 894 } 895 } 896 return false; 897 } 898 899 case CXXTemporaryObjectExprClass: 900 case CXXConstructExprClass: 901 return false; 902 903 case ObjCMessageExprClass: 904 return false; 905 906 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 907#if 0 908 const ObjCImplicitSetterGetterRefExpr *Ref = 909 cast<ObjCImplicitSetterGetterRefExpr>(this); 910 // FIXME: We really want the location of the '.' here. 911 Loc = Ref->getLocation(); 912 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 913 if (Ref->getBase()) 914 R2 = Ref->getBase()->getSourceRange(); 915#else 916 Loc = getExprLoc(); 917 R1 = getSourceRange(); 918#endif 919 return true; 920 } 921 case StmtExprClass: { 922 // Statement exprs don't logically have side effects themselves, but are 923 // sometimes used in macros in ways that give them a type that is unused. 924 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 925 // however, if the result of the stmt expr is dead, we don't want to emit a 926 // warning. 927 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 928 if (!CS->body_empty()) 929 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 930 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 931 932 Loc = cast<StmtExpr>(this)->getLParenLoc(); 933 R1 = getSourceRange(); 934 return true; 935 } 936 case CStyleCastExprClass: 937 // If this is an explicit cast to void, allow it. People do this when they 938 // think they know what they're doing :). 939 if (getType()->isVoidType()) 940 return false; 941 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 942 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 943 return true; 944 case CXXFunctionalCastExprClass: { 945 const CastExpr *CE = cast<CastExpr>(this); 946 947 // If this is a cast to void or a constructor conversion, check the operand. 948 // Otherwise, the result of the cast is unused. 949 if (CE->getCastKind() == CastExpr::CK_ToVoid || 950 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 951 return (cast<CastExpr>(this)->getSubExpr() 952 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 953 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 954 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 955 return true; 956 } 957 958 case ImplicitCastExprClass: 959 // Check the operand, since implicit casts are inserted by Sema 960 return (cast<ImplicitCastExpr>(this) 961 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 962 963 case CXXDefaultArgExprClass: 964 return (cast<CXXDefaultArgExpr>(this) 965 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 966 967 case CXXNewExprClass: 968 // FIXME: In theory, there might be new expressions that don't have side 969 // effects (e.g. a placement new with an uninitialized POD). 970 case CXXDeleteExprClass: 971 return false; 972 case CXXBindTemporaryExprClass: 973 return (cast<CXXBindTemporaryExpr>(this) 974 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 975 case CXXExprWithTemporariesClass: 976 return (cast<CXXExprWithTemporaries>(this) 977 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 978 } 979} 980 981/// DeclCanBeLvalue - Determine whether the given declaration can be 982/// an lvalue. This is a helper routine for isLvalue. 983static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 984 // C++ [temp.param]p6: 985 // A non-type non-reference template-parameter is not an lvalue. 986 if (const NonTypeTemplateParmDecl *NTTParm 987 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 988 return NTTParm->getType()->isReferenceType(); 989 990 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 991 // C++ 3.10p2: An lvalue refers to an object or function. 992 (Ctx.getLangOptions().CPlusPlus && 993 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 994} 995 996/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 997/// incomplete type other than void. Nonarray expressions that can be lvalues: 998/// - name, where name must be a variable 999/// - e[i] 1000/// - (e), where e must be an lvalue 1001/// - e.name, where e must be an lvalue 1002/// - e->name 1003/// - *e, the type of e cannot be a function type 1004/// - string-constant 1005/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1006/// - reference type [C++ [expr]] 1007/// 1008Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1009 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1010 1011 isLvalueResult Res = isLvalueInternal(Ctx); 1012 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1013 return Res; 1014 1015 // first, check the type (C99 6.3.2.1). Expressions with function 1016 // type in C are not lvalues, but they can be lvalues in C++. 1017 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1018 return LV_NotObjectType; 1019 1020 // Allow qualified void which is an incomplete type other than void (yuck). 1021 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1022 return LV_IncompleteVoidType; 1023 1024 return LV_Valid; 1025} 1026 1027// Check whether the expression can be sanely treated like an l-value 1028Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1029 switch (getStmtClass()) { 1030 case ObjCIsaExprClass: 1031 case StringLiteralClass: // C99 6.5.1p4 1032 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1033 return LV_Valid; 1034 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1035 // For vectors, make sure base is an lvalue (i.e. not a function call). 1036 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1037 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1038 return LV_Valid; 1039 case DeclRefExprClass: { // C99 6.5.1p2 1040 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1041 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1042 return LV_Valid; 1043 break; 1044 } 1045 case BlockDeclRefExprClass: { 1046 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1047 if (isa<VarDecl>(BDR->getDecl())) 1048 return LV_Valid; 1049 break; 1050 } 1051 case MemberExprClass: { 1052 const MemberExpr *m = cast<MemberExpr>(this); 1053 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1054 NamedDecl *Member = m->getMemberDecl(); 1055 // C++ [expr.ref]p4: 1056 // If E2 is declared to have type "reference to T", then E1.E2 1057 // is an lvalue. 1058 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1059 if (Value->getType()->isReferenceType()) 1060 return LV_Valid; 1061 1062 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1063 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1064 return LV_Valid; 1065 1066 // -- If E2 is a non-static data member [...]. If E1 is an 1067 // lvalue, then E1.E2 is an lvalue. 1068 if (isa<FieldDecl>(Member)) { 1069 if (m->isArrow()) 1070 return LV_Valid; 1071 Expr *BaseExp = m->getBase(); 1072 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) 1073 return LV_SubObjCPropertySetting; 1074 return 1075 (BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) ? 1076 LV_SubObjCPropertyGetterSetting : BaseExp->isLvalue(Ctx); 1077 } 1078 1079 // -- If it refers to a static member function [...], then 1080 // E1.E2 is an lvalue. 1081 // -- Otherwise, if E1.E2 refers to a non-static member 1082 // function [...], then E1.E2 is not an lvalue. 1083 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1084 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1085 1086 // -- If E2 is a member enumerator [...], the expression E1.E2 1087 // is not an lvalue. 1088 if (isa<EnumConstantDecl>(Member)) 1089 return LV_InvalidExpression; 1090 1091 // Not an lvalue. 1092 return LV_InvalidExpression; 1093 } 1094 1095 // C99 6.5.2.3p4 1096 if (m->isArrow()) 1097 return LV_Valid; 1098 Expr *BaseExp = m->getBase(); 1099 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) 1100 return LV_SubObjCPropertySetting; 1101 return 1102 (BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) ? 1103 LV_SubObjCPropertyGetterSetting : BaseExp->isLvalue(Ctx); 1104 } 1105 case UnaryOperatorClass: 1106 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1107 return LV_Valid; // C99 6.5.3p4 1108 1109 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1110 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1111 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1112 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1113 1114 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1115 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1116 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1117 return LV_Valid; 1118 break; 1119 case ImplicitCastExprClass: 1120 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1121 : LV_InvalidExpression; 1122 case ParenExprClass: // C99 6.5.1p5 1123 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1124 case BinaryOperatorClass: 1125 case CompoundAssignOperatorClass: { 1126 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1127 1128 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1129 BinOp->getOpcode() == BinaryOperator::Comma) 1130 return BinOp->getRHS()->isLvalue(Ctx); 1131 1132 // C++ [expr.mptr.oper]p6 1133 // The result of a .* expression is an lvalue only if its first operand is 1134 // an lvalue and its second operand is a pointer to data member. 1135 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1136 !BinOp->getType()->isFunctionType()) 1137 return BinOp->getLHS()->isLvalue(Ctx); 1138 1139 // The result of an ->* expression is an lvalue only if its second operand 1140 // is a pointer to data member. 1141 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1142 !BinOp->getType()->isFunctionType()) { 1143 QualType Ty = BinOp->getRHS()->getType(); 1144 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1145 return LV_Valid; 1146 } 1147 1148 if (!BinOp->isAssignmentOp()) 1149 return LV_InvalidExpression; 1150 1151 if (Ctx.getLangOptions().CPlusPlus) 1152 // C++ [expr.ass]p1: 1153 // The result of an assignment operation [...] is an lvalue. 1154 return LV_Valid; 1155 1156 1157 // C99 6.5.16: 1158 // An assignment expression [...] is not an lvalue. 1159 return LV_InvalidExpression; 1160 } 1161 case CallExprClass: 1162 case CXXOperatorCallExprClass: 1163 case CXXMemberCallExprClass: { 1164 // C++0x [expr.call]p10 1165 // A function call is an lvalue if and only if the result type 1166 // is an lvalue reference. 1167 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1168 if (ReturnType->isLValueReferenceType()) 1169 return LV_Valid; 1170 1171 break; 1172 } 1173 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1174 return LV_Valid; 1175 case ChooseExprClass: 1176 // __builtin_choose_expr is an lvalue if the selected operand is. 1177 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1178 case ExtVectorElementExprClass: 1179 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1180 return LV_DuplicateVectorComponents; 1181 return LV_Valid; 1182 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1183 return LV_Valid; 1184 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1185 return LV_Valid; 1186 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1187 return LV_Valid; 1188 case PredefinedExprClass: 1189 return LV_Valid; 1190 case UnresolvedLookupExprClass: 1191 return LV_Valid; 1192 case CXXDefaultArgExprClass: 1193 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1194 case CStyleCastExprClass: 1195 case CXXFunctionalCastExprClass: 1196 case CXXStaticCastExprClass: 1197 case CXXDynamicCastExprClass: 1198 case CXXReinterpretCastExprClass: 1199 case CXXConstCastExprClass: 1200 // The result of an explicit cast is an lvalue if the type we are 1201 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1202 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1203 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1204 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1205 isLValueReferenceType()) 1206 return LV_Valid; 1207 break; 1208 case CXXTypeidExprClass: 1209 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1210 return LV_Valid; 1211 case CXXBindTemporaryExprClass: 1212 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1213 isLvalueInternal(Ctx); 1214 case CXXBindReferenceExprClass: 1215 // Something that's bound to a reference is always an lvalue. 1216 return LV_Valid; 1217 case ConditionalOperatorClass: { 1218 // Complicated handling is only for C++. 1219 if (!Ctx.getLangOptions().CPlusPlus) 1220 return LV_InvalidExpression; 1221 1222 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1223 // everywhere there's an object converted to an rvalue. Also, any other 1224 // casts should be wrapped by ImplicitCastExprs. There's just the special 1225 // case involving throws to work out. 1226 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1227 Expr *True = Cond->getTrueExpr(); 1228 Expr *False = Cond->getFalseExpr(); 1229 // C++0x 5.16p2 1230 // If either the second or the third operand has type (cv) void, [...] 1231 // the result [...] is an rvalue. 1232 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1233 return LV_InvalidExpression; 1234 1235 // Both sides must be lvalues for the result to be an lvalue. 1236 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1237 return LV_InvalidExpression; 1238 1239 // That's it. 1240 return LV_Valid; 1241 } 1242 1243 case Expr::CXXExprWithTemporariesClass: 1244 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1245 1246 case Expr::ObjCMessageExprClass: 1247 if (const ObjCMethodDecl *Method 1248 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1249 if (Method->getResultType()->isLValueReferenceType()) 1250 return LV_Valid; 1251 break; 1252 1253 default: 1254 break; 1255 } 1256 return LV_InvalidExpression; 1257} 1258 1259/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1260/// does not have an incomplete type, does not have a const-qualified type, and 1261/// if it is a structure or union, does not have any member (including, 1262/// recursively, any member or element of all contained aggregates or unions) 1263/// with a const-qualified type. 1264Expr::isModifiableLvalueResult 1265Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1266 isLvalueResult lvalResult = isLvalue(Ctx); 1267 1268 switch (lvalResult) { 1269 case LV_Valid: 1270 // C++ 3.10p11: Functions cannot be modified, but pointers to 1271 // functions can be modifiable. 1272 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1273 return MLV_NotObjectType; 1274 break; 1275 1276 case LV_NotObjectType: return MLV_NotObjectType; 1277 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1278 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1279 case LV_InvalidExpression: 1280 // If the top level is a C-style cast, and the subexpression is a valid 1281 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1282 // GCC extension. We don't support it, but we want to produce good 1283 // diagnostics when it happens so that the user knows why. 1284 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1285 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1286 if (Loc) 1287 *Loc = CE->getLParenLoc(); 1288 return MLV_LValueCast; 1289 } 1290 } 1291 return MLV_InvalidExpression; 1292 case LV_MemberFunction: return MLV_MemberFunction; 1293 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1294 case LV_SubObjCPropertyGetterSetting: 1295 return MLV_SubObjCPropertyGetterSetting; 1296 } 1297 1298 // The following is illegal: 1299 // void takeclosure(void (^C)(void)); 1300 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1301 // 1302 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1303 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1304 return MLV_NotBlockQualified; 1305 } 1306 1307 // Assigning to an 'implicit' property? 1308 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1309 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1310 if (Expr->getSetterMethod() == 0) 1311 return MLV_NoSetterProperty; 1312 } 1313 1314 QualType CT = Ctx.getCanonicalType(getType()); 1315 1316 if (CT.isConstQualified()) 1317 return MLV_ConstQualified; 1318 if (CT->isArrayType()) 1319 return MLV_ArrayType; 1320 if (CT->isIncompleteType()) 1321 return MLV_IncompleteType; 1322 1323 if (const RecordType *r = CT->getAs<RecordType>()) { 1324 if (r->hasConstFields()) 1325 return MLV_ConstQualified; 1326 } 1327 1328 return MLV_Valid; 1329} 1330 1331/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1332/// returns true, if it is; false otherwise. 1333bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1334 switch (getStmtClass()) { 1335 default: 1336 return false; 1337 case ObjCIvarRefExprClass: 1338 return true; 1339 case Expr::UnaryOperatorClass: 1340 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1341 case ParenExprClass: 1342 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1343 case ImplicitCastExprClass: 1344 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1345 case CStyleCastExprClass: 1346 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1347 case DeclRefExprClass: { 1348 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1349 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1350 if (VD->hasGlobalStorage()) 1351 return true; 1352 QualType T = VD->getType(); 1353 // dereferencing to a pointer is always a gc'able candidate, 1354 // unless it is __weak. 1355 return T->isPointerType() && 1356 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1357 } 1358 return false; 1359 } 1360 case MemberExprClass: { 1361 const MemberExpr *M = cast<MemberExpr>(this); 1362 return M->getBase()->isOBJCGCCandidate(Ctx); 1363 } 1364 case ArraySubscriptExprClass: 1365 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1366 } 1367} 1368Expr* Expr::IgnoreParens() { 1369 Expr* E = this; 1370 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1371 E = P->getSubExpr(); 1372 1373 return E; 1374} 1375 1376/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1377/// or CastExprs or ImplicitCastExprs, returning their operand. 1378Expr *Expr::IgnoreParenCasts() { 1379 Expr *E = this; 1380 while (true) { 1381 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1382 E = P->getSubExpr(); 1383 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1384 E = P->getSubExpr(); 1385 else 1386 return E; 1387 } 1388} 1389 1390/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1391/// value (including ptr->int casts of the same size). Strip off any 1392/// ParenExpr or CastExprs, returning their operand. 1393Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1394 Expr *E = this; 1395 while (true) { 1396 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1397 E = P->getSubExpr(); 1398 continue; 1399 } 1400 1401 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1402 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1403 // ptr<->int casts of the same width. We also ignore all identify casts. 1404 Expr *SE = P->getSubExpr(); 1405 1406 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1407 E = SE; 1408 continue; 1409 } 1410 1411 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1412 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1413 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1414 E = SE; 1415 continue; 1416 } 1417 } 1418 1419 return E; 1420 } 1421} 1422 1423bool Expr::isDefaultArgument() const { 1424 const Expr *E = this; 1425 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1426 E = ICE->getSubExprAsWritten(); 1427 1428 return isa<CXXDefaultArgExpr>(E); 1429} 1430 1431/// hasAnyTypeDependentArguments - Determines if any of the expressions 1432/// in Exprs is type-dependent. 1433bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1434 for (unsigned I = 0; I < NumExprs; ++I) 1435 if (Exprs[I]->isTypeDependent()) 1436 return true; 1437 1438 return false; 1439} 1440 1441/// hasAnyValueDependentArguments - Determines if any of the expressions 1442/// in Exprs is value-dependent. 1443bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1444 for (unsigned I = 0; I < NumExprs; ++I) 1445 if (Exprs[I]->isValueDependent()) 1446 return true; 1447 1448 return false; 1449} 1450 1451bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1452 // This function is attempting whether an expression is an initializer 1453 // which can be evaluated at compile-time. isEvaluatable handles most 1454 // of the cases, but it can't deal with some initializer-specific 1455 // expressions, and it can't deal with aggregates; we deal with those here, 1456 // and fall back to isEvaluatable for the other cases. 1457 1458 // FIXME: This function assumes the variable being assigned to 1459 // isn't a reference type! 1460 1461 switch (getStmtClass()) { 1462 default: break; 1463 case StringLiteralClass: 1464 case ObjCStringLiteralClass: 1465 case ObjCEncodeExprClass: 1466 return true; 1467 case CompoundLiteralExprClass: { 1468 // This handles gcc's extension that allows global initializers like 1469 // "struct x {int x;} x = (struct x) {};". 1470 // FIXME: This accepts other cases it shouldn't! 1471 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1472 return Exp->isConstantInitializer(Ctx); 1473 } 1474 case InitListExprClass: { 1475 // FIXME: This doesn't deal with fields with reference types correctly. 1476 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1477 // to bitfields. 1478 const InitListExpr *Exp = cast<InitListExpr>(this); 1479 unsigned numInits = Exp->getNumInits(); 1480 for (unsigned i = 0; i < numInits; i++) { 1481 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1482 return false; 1483 } 1484 return true; 1485 } 1486 case ImplicitValueInitExprClass: 1487 return true; 1488 case ParenExprClass: 1489 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1490 case UnaryOperatorClass: { 1491 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1492 if (Exp->getOpcode() == UnaryOperator::Extension) 1493 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1494 break; 1495 } 1496 case BinaryOperatorClass: { 1497 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1498 // but this handles the common case. 1499 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1500 if (Exp->getOpcode() == BinaryOperator::Sub && 1501 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1502 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1503 return true; 1504 break; 1505 } 1506 case ImplicitCastExprClass: 1507 case CStyleCastExprClass: 1508 // Handle casts with a destination that's a struct or union; this 1509 // deals with both the gcc no-op struct cast extension and the 1510 // cast-to-union extension. 1511 if (getType()->isRecordType()) 1512 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1513 1514 // Integer->integer casts can be handled here, which is important for 1515 // things like (int)(&&x-&&y). Scary but true. 1516 if (getType()->isIntegerType() && 1517 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1518 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1519 1520 break; 1521 } 1522 return isEvaluatable(Ctx); 1523} 1524 1525/// isIntegerConstantExpr - this recursive routine will test if an expression is 1526/// an integer constant expression. 1527 1528/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1529/// comma, etc 1530/// 1531/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1532/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1533/// cast+dereference. 1534 1535// CheckICE - This function does the fundamental ICE checking: the returned 1536// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1537// Note that to reduce code duplication, this helper does no evaluation 1538// itself; the caller checks whether the expression is evaluatable, and 1539// in the rare cases where CheckICE actually cares about the evaluated 1540// value, it calls into Evalute. 1541// 1542// Meanings of Val: 1543// 0: This expression is an ICE if it can be evaluated by Evaluate. 1544// 1: This expression is not an ICE, but if it isn't evaluated, it's 1545// a legal subexpression for an ICE. This return value is used to handle 1546// the comma operator in C99 mode. 1547// 2: This expression is not an ICE, and is not a legal subexpression for one. 1548 1549struct ICEDiag { 1550 unsigned Val; 1551 SourceLocation Loc; 1552 1553 public: 1554 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1555 ICEDiag() : Val(0) {} 1556}; 1557 1558ICEDiag NoDiag() { return ICEDiag(); } 1559 1560static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1561 Expr::EvalResult EVResult; 1562 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1563 !EVResult.Val.isInt()) { 1564 return ICEDiag(2, E->getLocStart()); 1565 } 1566 return NoDiag(); 1567} 1568 1569static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1570 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1571 if (!E->getType()->isIntegralType()) { 1572 return ICEDiag(2, E->getLocStart()); 1573 } 1574 1575 switch (E->getStmtClass()) { 1576#define STMT(Node, Base) case Expr::Node##Class: 1577#define EXPR(Node, Base) 1578#include "clang/AST/StmtNodes.def" 1579 case Expr::PredefinedExprClass: 1580 case Expr::FloatingLiteralClass: 1581 case Expr::ImaginaryLiteralClass: 1582 case Expr::StringLiteralClass: 1583 case Expr::ArraySubscriptExprClass: 1584 case Expr::MemberExprClass: 1585 case Expr::CompoundAssignOperatorClass: 1586 case Expr::CompoundLiteralExprClass: 1587 case Expr::ExtVectorElementExprClass: 1588 case Expr::InitListExprClass: 1589 case Expr::DesignatedInitExprClass: 1590 case Expr::ImplicitValueInitExprClass: 1591 case Expr::ParenListExprClass: 1592 case Expr::VAArgExprClass: 1593 case Expr::AddrLabelExprClass: 1594 case Expr::StmtExprClass: 1595 case Expr::CXXMemberCallExprClass: 1596 case Expr::CXXDynamicCastExprClass: 1597 case Expr::CXXTypeidExprClass: 1598 case Expr::CXXNullPtrLiteralExprClass: 1599 case Expr::CXXThisExprClass: 1600 case Expr::CXXThrowExprClass: 1601 case Expr::CXXNewExprClass: 1602 case Expr::CXXDeleteExprClass: 1603 case Expr::CXXPseudoDestructorExprClass: 1604 case Expr::UnresolvedLookupExprClass: 1605 case Expr::DependentScopeDeclRefExprClass: 1606 case Expr::CXXConstructExprClass: 1607 case Expr::CXXBindTemporaryExprClass: 1608 case Expr::CXXBindReferenceExprClass: 1609 case Expr::CXXExprWithTemporariesClass: 1610 case Expr::CXXTemporaryObjectExprClass: 1611 case Expr::CXXUnresolvedConstructExprClass: 1612 case Expr::CXXDependentScopeMemberExprClass: 1613 case Expr::UnresolvedMemberExprClass: 1614 case Expr::ObjCStringLiteralClass: 1615 case Expr::ObjCEncodeExprClass: 1616 case Expr::ObjCMessageExprClass: 1617 case Expr::ObjCSelectorExprClass: 1618 case Expr::ObjCProtocolExprClass: 1619 case Expr::ObjCIvarRefExprClass: 1620 case Expr::ObjCPropertyRefExprClass: 1621 case Expr::ObjCImplicitSetterGetterRefExprClass: 1622 case Expr::ObjCSuperExprClass: 1623 case Expr::ObjCIsaExprClass: 1624 case Expr::ShuffleVectorExprClass: 1625 case Expr::BlockExprClass: 1626 case Expr::BlockDeclRefExprClass: 1627 case Expr::NoStmtClass: 1628 return ICEDiag(2, E->getLocStart()); 1629 1630 case Expr::GNUNullExprClass: 1631 // GCC considers the GNU __null value to be an integral constant expression. 1632 return NoDiag(); 1633 1634 case Expr::ParenExprClass: 1635 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1636 case Expr::IntegerLiteralClass: 1637 case Expr::CharacterLiteralClass: 1638 case Expr::CXXBoolLiteralExprClass: 1639 case Expr::CXXZeroInitValueExprClass: 1640 case Expr::TypesCompatibleExprClass: 1641 case Expr::UnaryTypeTraitExprClass: 1642 return NoDiag(); 1643 case Expr::CallExprClass: 1644 case Expr::CXXOperatorCallExprClass: { 1645 const CallExpr *CE = cast<CallExpr>(E); 1646 if (CE->isBuiltinCall(Ctx)) 1647 return CheckEvalInICE(E, Ctx); 1648 return ICEDiag(2, E->getLocStart()); 1649 } 1650 case Expr::DeclRefExprClass: 1651 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1652 return NoDiag(); 1653 if (Ctx.getLangOptions().CPlusPlus && 1654 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1655 // C++ 7.1.5.1p2 1656 // A variable of non-volatile const-qualified integral or enumeration 1657 // type initialized by an ICE can be used in ICEs. 1658 if (const VarDecl *Dcl = 1659 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1660 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1661 if (Quals.hasVolatile() || !Quals.hasConst()) 1662 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1663 1664 // Look for a declaration of this variable that has an initializer. 1665 const VarDecl *ID = 0; 1666 const Expr *Init = Dcl->getAnyInitializer(ID); 1667 if (Init) { 1668 if (ID->isInitKnownICE()) { 1669 // We have already checked whether this subexpression is an 1670 // integral constant expression. 1671 if (ID->isInitICE()) 1672 return NoDiag(); 1673 else 1674 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1675 } 1676 1677 // It's an ICE whether or not the definition we found is 1678 // out-of-line. See DR 721 and the discussion in Clang PR 1679 // 6206 for details. 1680 1681 if (Dcl->isCheckingICE()) { 1682 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1683 } 1684 1685 Dcl->setCheckingICE(); 1686 ICEDiag Result = CheckICE(Init, Ctx); 1687 // Cache the result of the ICE test. 1688 Dcl->setInitKnownICE(Result.Val == 0); 1689 return Result; 1690 } 1691 } 1692 } 1693 return ICEDiag(2, E->getLocStart()); 1694 case Expr::UnaryOperatorClass: { 1695 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1696 switch (Exp->getOpcode()) { 1697 case UnaryOperator::PostInc: 1698 case UnaryOperator::PostDec: 1699 case UnaryOperator::PreInc: 1700 case UnaryOperator::PreDec: 1701 case UnaryOperator::AddrOf: 1702 case UnaryOperator::Deref: 1703 return ICEDiag(2, E->getLocStart()); 1704 1705 case UnaryOperator::Extension: 1706 case UnaryOperator::LNot: 1707 case UnaryOperator::Plus: 1708 case UnaryOperator::Minus: 1709 case UnaryOperator::Not: 1710 case UnaryOperator::Real: 1711 case UnaryOperator::Imag: 1712 return CheckICE(Exp->getSubExpr(), Ctx); 1713 case UnaryOperator::OffsetOf: 1714 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1715 // Evaluate matches the proposed gcc behavior for cases like 1716 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1717 // compliance: we should warn earlier for offsetof expressions with 1718 // array subscripts that aren't ICEs, and if the array subscripts 1719 // are ICEs, the value of the offsetof must be an integer constant. 1720 return CheckEvalInICE(E, Ctx); 1721 } 1722 } 1723 case Expr::SizeOfAlignOfExprClass: { 1724 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1725 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1726 return ICEDiag(2, E->getLocStart()); 1727 return NoDiag(); 1728 } 1729 case Expr::BinaryOperatorClass: { 1730 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1731 switch (Exp->getOpcode()) { 1732 case BinaryOperator::PtrMemD: 1733 case BinaryOperator::PtrMemI: 1734 case BinaryOperator::Assign: 1735 case BinaryOperator::MulAssign: 1736 case BinaryOperator::DivAssign: 1737 case BinaryOperator::RemAssign: 1738 case BinaryOperator::AddAssign: 1739 case BinaryOperator::SubAssign: 1740 case BinaryOperator::ShlAssign: 1741 case BinaryOperator::ShrAssign: 1742 case BinaryOperator::AndAssign: 1743 case BinaryOperator::XorAssign: 1744 case BinaryOperator::OrAssign: 1745 return ICEDiag(2, E->getLocStart()); 1746 1747 case BinaryOperator::Mul: 1748 case BinaryOperator::Div: 1749 case BinaryOperator::Rem: 1750 case BinaryOperator::Add: 1751 case BinaryOperator::Sub: 1752 case BinaryOperator::Shl: 1753 case BinaryOperator::Shr: 1754 case BinaryOperator::LT: 1755 case BinaryOperator::GT: 1756 case BinaryOperator::LE: 1757 case BinaryOperator::GE: 1758 case BinaryOperator::EQ: 1759 case BinaryOperator::NE: 1760 case BinaryOperator::And: 1761 case BinaryOperator::Xor: 1762 case BinaryOperator::Or: 1763 case BinaryOperator::Comma: { 1764 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1765 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1766 if (Exp->getOpcode() == BinaryOperator::Div || 1767 Exp->getOpcode() == BinaryOperator::Rem) { 1768 // Evaluate gives an error for undefined Div/Rem, so make sure 1769 // we don't evaluate one. 1770 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1771 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1772 if (REval == 0) 1773 return ICEDiag(1, E->getLocStart()); 1774 if (REval.isSigned() && REval.isAllOnesValue()) { 1775 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1776 if (LEval.isMinSignedValue()) 1777 return ICEDiag(1, E->getLocStart()); 1778 } 1779 } 1780 } 1781 if (Exp->getOpcode() == BinaryOperator::Comma) { 1782 if (Ctx.getLangOptions().C99) { 1783 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1784 // if it isn't evaluated. 1785 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1786 return ICEDiag(1, E->getLocStart()); 1787 } else { 1788 // In both C89 and C++, commas in ICEs are illegal. 1789 return ICEDiag(2, E->getLocStart()); 1790 } 1791 } 1792 if (LHSResult.Val >= RHSResult.Val) 1793 return LHSResult; 1794 return RHSResult; 1795 } 1796 case BinaryOperator::LAnd: 1797 case BinaryOperator::LOr: { 1798 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1799 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1800 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1801 // Rare case where the RHS has a comma "side-effect"; we need 1802 // to actually check the condition to see whether the side 1803 // with the comma is evaluated. 1804 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1805 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1806 return RHSResult; 1807 return NoDiag(); 1808 } 1809 1810 if (LHSResult.Val >= RHSResult.Val) 1811 return LHSResult; 1812 return RHSResult; 1813 } 1814 } 1815 } 1816 case Expr::ImplicitCastExprClass: 1817 case Expr::CStyleCastExprClass: 1818 case Expr::CXXFunctionalCastExprClass: 1819 case Expr::CXXNamedCastExprClass: 1820 case Expr::CXXStaticCastExprClass: 1821 case Expr::CXXReinterpretCastExprClass: 1822 case Expr::CXXConstCastExprClass: { 1823 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1824 if (SubExpr->getType()->isIntegralType()) 1825 return CheckICE(SubExpr, Ctx); 1826 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1827 return NoDiag(); 1828 return ICEDiag(2, E->getLocStart()); 1829 } 1830 case Expr::ConditionalOperatorClass: { 1831 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1832 // If the condition (ignoring parens) is a __builtin_constant_p call, 1833 // then only the true side is actually considered in an integer constant 1834 // expression, and it is fully evaluated. This is an important GNU 1835 // extension. See GCC PR38377 for discussion. 1836 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1837 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1838 Expr::EvalResult EVResult; 1839 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1840 !EVResult.Val.isInt()) { 1841 return ICEDiag(2, E->getLocStart()); 1842 } 1843 return NoDiag(); 1844 } 1845 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1846 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1847 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1848 if (CondResult.Val == 2) 1849 return CondResult; 1850 if (TrueResult.Val == 2) 1851 return TrueResult; 1852 if (FalseResult.Val == 2) 1853 return FalseResult; 1854 if (CondResult.Val == 1) 1855 return CondResult; 1856 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1857 return NoDiag(); 1858 // Rare case where the diagnostics depend on which side is evaluated 1859 // Note that if we get here, CondResult is 0, and at least one of 1860 // TrueResult and FalseResult is non-zero. 1861 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1862 return FalseResult; 1863 } 1864 return TrueResult; 1865 } 1866 case Expr::CXXDefaultArgExprClass: 1867 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1868 case Expr::ChooseExprClass: { 1869 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1870 } 1871 } 1872 1873 // Silence a GCC warning 1874 return ICEDiag(2, E->getLocStart()); 1875} 1876 1877bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1878 SourceLocation *Loc, bool isEvaluated) const { 1879 ICEDiag d = CheckICE(this, Ctx); 1880 if (d.Val != 0) { 1881 if (Loc) *Loc = d.Loc; 1882 return false; 1883 } 1884 EvalResult EvalResult; 1885 if (!Evaluate(EvalResult, Ctx)) 1886 llvm_unreachable("ICE cannot be evaluated!"); 1887 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1888 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1889 Result = EvalResult.Val.getInt(); 1890 return true; 1891} 1892 1893/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1894/// integer constant expression with the value zero, or if this is one that is 1895/// cast to void*. 1896bool Expr::isNullPointerConstant(ASTContext &Ctx, 1897 NullPointerConstantValueDependence NPC) const { 1898 if (isValueDependent()) { 1899 switch (NPC) { 1900 case NPC_NeverValueDependent: 1901 assert(false && "Unexpected value dependent expression!"); 1902 // If the unthinkable happens, fall through to the safest alternative. 1903 1904 case NPC_ValueDependentIsNull: 1905 return isTypeDependent() || getType()->isIntegralType(); 1906 1907 case NPC_ValueDependentIsNotNull: 1908 return false; 1909 } 1910 } 1911 1912 // Strip off a cast to void*, if it exists. Except in C++. 1913 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1914 if (!Ctx.getLangOptions().CPlusPlus) { 1915 // Check that it is a cast to void*. 1916 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1917 QualType Pointee = PT->getPointeeType(); 1918 if (!Pointee.hasQualifiers() && 1919 Pointee->isVoidType() && // to void* 1920 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1921 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1922 } 1923 } 1924 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1925 // Ignore the ImplicitCastExpr type entirely. 1926 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1927 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1928 // Accept ((void*)0) as a null pointer constant, as many other 1929 // implementations do. 1930 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1931 } else if (const CXXDefaultArgExpr *DefaultArg 1932 = dyn_cast<CXXDefaultArgExpr>(this)) { 1933 // See through default argument expressions 1934 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1935 } else if (isa<GNUNullExpr>(this)) { 1936 // The GNU __null extension is always a null pointer constant. 1937 return true; 1938 } 1939 1940 // C++0x nullptr_t is always a null pointer constant. 1941 if (getType()->isNullPtrType()) 1942 return true; 1943 1944 // This expression must be an integer type. 1945 if (!getType()->isIntegerType() || 1946 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1947 return false; 1948 1949 // If we have an integer constant expression, we need to *evaluate* it and 1950 // test for the value 0. 1951 llvm::APSInt Result; 1952 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1953} 1954 1955FieldDecl *Expr::getBitField() { 1956 Expr *E = this->IgnoreParens(); 1957 1958 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1959 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1960 E = ICE->getSubExpr()->IgnoreParens(); 1961 else 1962 break; 1963 } 1964 1965 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1966 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1967 if (Field->isBitField()) 1968 return Field; 1969 1970 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1971 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1972 return BinOp->getLHS()->getBitField(); 1973 1974 return 0; 1975} 1976 1977bool Expr::refersToVectorElement() const { 1978 const Expr *E = this->IgnoreParens(); 1979 1980 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1981 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1982 E = ICE->getSubExpr()->IgnoreParens(); 1983 else 1984 break; 1985 } 1986 1987 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 1988 return ASE->getBase()->getType()->isVectorType(); 1989 1990 if (isa<ExtVectorElementExpr>(E)) 1991 return true; 1992 1993 return false; 1994} 1995 1996/// isArrow - Return true if the base expression is a pointer to vector, 1997/// return false if the base expression is a vector. 1998bool ExtVectorElementExpr::isArrow() const { 1999 return getBase()->getType()->isPointerType(); 2000} 2001 2002unsigned ExtVectorElementExpr::getNumElements() const { 2003 if (const VectorType *VT = getType()->getAs<VectorType>()) 2004 return VT->getNumElements(); 2005 return 1; 2006} 2007 2008/// containsDuplicateElements - Return true if any element access is repeated. 2009bool ExtVectorElementExpr::containsDuplicateElements() const { 2010 // FIXME: Refactor this code to an accessor on the AST node which returns the 2011 // "type" of component access, and share with code below and in Sema. 2012 llvm::StringRef Comp = Accessor->getName(); 2013 2014 // Halving swizzles do not contain duplicate elements. 2015 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2016 return false; 2017 2018 // Advance past s-char prefix on hex swizzles. 2019 if (Comp[0] == 's' || Comp[0] == 'S') 2020 Comp = Comp.substr(1); 2021 2022 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2023 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2024 return true; 2025 2026 return false; 2027} 2028 2029/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2030void ExtVectorElementExpr::getEncodedElementAccess( 2031 llvm::SmallVectorImpl<unsigned> &Elts) const { 2032 llvm::StringRef Comp = Accessor->getName(); 2033 if (Comp[0] == 's' || Comp[0] == 'S') 2034 Comp = Comp.substr(1); 2035 2036 bool isHi = Comp == "hi"; 2037 bool isLo = Comp == "lo"; 2038 bool isEven = Comp == "even"; 2039 bool isOdd = Comp == "odd"; 2040 2041 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2042 uint64_t Index; 2043 2044 if (isHi) 2045 Index = e + i; 2046 else if (isLo) 2047 Index = i; 2048 else if (isEven) 2049 Index = 2 * i; 2050 else if (isOdd) 2051 Index = 2 * i + 1; 2052 else 2053 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2054 2055 Elts.push_back(Index); 2056 } 2057} 2058 2059// constructor for instance messages. 2060ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 2061 QualType retType, ObjCMethodDecl *mproto, 2062 SourceLocation LBrac, SourceLocation RBrac, 2063 Expr **ArgExprs, unsigned nargs) 2064 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2065 MethodProto(mproto) { 2066 NumArgs = nargs; 2067 SubExprs = new Stmt*[NumArgs+1]; 2068 SubExprs[RECEIVER] = receiver; 2069 if (NumArgs) { 2070 for (unsigned i = 0; i != NumArgs; ++i) 2071 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2072 } 2073 LBracloc = LBrac; 2074 RBracloc = RBrac; 2075} 2076 2077// constructor for class messages. 2078// FIXME: clsName should be typed to ObjCInterfaceType 2079ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 2080 QualType retType, ObjCMethodDecl *mproto, 2081 SourceLocation LBrac, SourceLocation RBrac, 2082 Expr **ArgExprs, unsigned nargs) 2083 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2084 MethodProto(mproto) { 2085 NumArgs = nargs; 2086 SubExprs = new Stmt*[NumArgs+1]; 2087 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2088 if (NumArgs) { 2089 for (unsigned i = 0; i != NumArgs; ++i) 2090 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2091 } 2092 LBracloc = LBrac; 2093 RBracloc = RBrac; 2094} 2095 2096// constructor for class messages. 2097ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2098 QualType retType, ObjCMethodDecl *mproto, 2099 SourceLocation LBrac, SourceLocation RBrac, 2100 Expr **ArgExprs, unsigned nargs) 2101: Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2102MethodProto(mproto) { 2103 NumArgs = nargs; 2104 SubExprs = new Stmt*[NumArgs+1]; 2105 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2106 if (NumArgs) { 2107 for (unsigned i = 0; i != NumArgs; ++i) 2108 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2109 } 2110 LBracloc = LBrac; 2111 RBracloc = RBrac; 2112} 2113 2114ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2115 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2116 switch (x & Flags) { 2117 default: 2118 assert(false && "Invalid ObjCMessageExpr."); 2119 case IsInstMeth: 2120 return ClassInfo(0, 0); 2121 case IsClsMethDeclUnknown: 2122 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2123 case IsClsMethDeclKnown: { 2124 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2125 return ClassInfo(D, D->getIdentifier()); 2126 } 2127 } 2128} 2129 2130void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2131 if (CI.first == 0 && CI.second == 0) 2132 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2133 else if (CI.first == 0) 2134 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2135 else 2136 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2137} 2138 2139 2140bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2141 return getCond()->EvaluateAsInt(C) != 0; 2142} 2143 2144void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2145 unsigned NumExprs) { 2146 if (SubExprs) C.Deallocate(SubExprs); 2147 2148 SubExprs = new (C) Stmt* [NumExprs]; 2149 this->NumExprs = NumExprs; 2150 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2151} 2152 2153void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2154 DestroyChildren(C); 2155 if (SubExprs) C.Deallocate(SubExprs); 2156 this->~ShuffleVectorExpr(); 2157 C.Deallocate(this); 2158} 2159 2160void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2161 // Override default behavior of traversing children. If this has a type 2162 // operand and the type is a variable-length array, the child iteration 2163 // will iterate over the size expression. However, this expression belongs 2164 // to the type, not to this, so we don't want to delete it. 2165 // We still want to delete this expression. 2166 if (isArgumentType()) { 2167 this->~SizeOfAlignOfExpr(); 2168 C.Deallocate(this); 2169 } 2170 else 2171 Expr::DoDestroy(C); 2172} 2173 2174//===----------------------------------------------------------------------===// 2175// DesignatedInitExpr 2176//===----------------------------------------------------------------------===// 2177 2178IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2179 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2180 if (Field.NameOrField & 0x01) 2181 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2182 else 2183 return getField()->getIdentifier(); 2184} 2185 2186DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2187 unsigned NumDesignators, 2188 const Designator *Designators, 2189 SourceLocation EqualOrColonLoc, 2190 bool GNUSyntax, 2191 Expr **IndexExprs, 2192 unsigned NumIndexExprs, 2193 Expr *Init) 2194 : Expr(DesignatedInitExprClass, Ty, 2195 Init->isTypeDependent(), Init->isValueDependent()), 2196 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2197 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2198 this->Designators = new (C) Designator[NumDesignators]; 2199 2200 // Record the initializer itself. 2201 child_iterator Child = child_begin(); 2202 *Child++ = Init; 2203 2204 // Copy the designators and their subexpressions, computing 2205 // value-dependence along the way. 2206 unsigned IndexIdx = 0; 2207 for (unsigned I = 0; I != NumDesignators; ++I) { 2208 this->Designators[I] = Designators[I]; 2209 2210 if (this->Designators[I].isArrayDesignator()) { 2211 // Compute type- and value-dependence. 2212 Expr *Index = IndexExprs[IndexIdx]; 2213 ValueDependent = ValueDependent || 2214 Index->isTypeDependent() || Index->isValueDependent(); 2215 2216 // Copy the index expressions into permanent storage. 2217 *Child++ = IndexExprs[IndexIdx++]; 2218 } else if (this->Designators[I].isArrayRangeDesignator()) { 2219 // Compute type- and value-dependence. 2220 Expr *Start = IndexExprs[IndexIdx]; 2221 Expr *End = IndexExprs[IndexIdx + 1]; 2222 ValueDependent = ValueDependent || 2223 Start->isTypeDependent() || Start->isValueDependent() || 2224 End->isTypeDependent() || End->isValueDependent(); 2225 2226 // Copy the start/end expressions into permanent storage. 2227 *Child++ = IndexExprs[IndexIdx++]; 2228 *Child++ = IndexExprs[IndexIdx++]; 2229 } 2230 } 2231 2232 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2233} 2234 2235DesignatedInitExpr * 2236DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2237 unsigned NumDesignators, 2238 Expr **IndexExprs, unsigned NumIndexExprs, 2239 SourceLocation ColonOrEqualLoc, 2240 bool UsesColonSyntax, Expr *Init) { 2241 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2242 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2243 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2244 ColonOrEqualLoc, UsesColonSyntax, 2245 IndexExprs, NumIndexExprs, Init); 2246} 2247 2248DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2249 unsigned NumIndexExprs) { 2250 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2251 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2252 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2253} 2254 2255void DesignatedInitExpr::setDesignators(ASTContext &C, 2256 const Designator *Desigs, 2257 unsigned NumDesigs) { 2258 DestroyDesignators(C); 2259 2260 Designators = new (C) Designator[NumDesigs]; 2261 NumDesignators = NumDesigs; 2262 for (unsigned I = 0; I != NumDesigs; ++I) 2263 Designators[I] = Desigs[I]; 2264} 2265 2266SourceRange DesignatedInitExpr::getSourceRange() const { 2267 SourceLocation StartLoc; 2268 Designator &First = 2269 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2270 if (First.isFieldDesignator()) { 2271 if (GNUSyntax) 2272 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2273 else 2274 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2275 } else 2276 StartLoc = 2277 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2278 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2279} 2280 2281Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2282 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2283 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2284 Ptr += sizeof(DesignatedInitExpr); 2285 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2286 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2287} 2288 2289Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2290 assert(D.Kind == Designator::ArrayRangeDesignator && 2291 "Requires array range designator"); 2292 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2293 Ptr += sizeof(DesignatedInitExpr); 2294 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2295 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2296} 2297 2298Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2299 assert(D.Kind == Designator::ArrayRangeDesignator && 2300 "Requires array range designator"); 2301 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2302 Ptr += sizeof(DesignatedInitExpr); 2303 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2304 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2305} 2306 2307/// \brief Replaces the designator at index @p Idx with the series 2308/// of designators in [First, Last). 2309void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2310 const Designator *First, 2311 const Designator *Last) { 2312 unsigned NumNewDesignators = Last - First; 2313 if (NumNewDesignators == 0) { 2314 std::copy_backward(Designators + Idx + 1, 2315 Designators + NumDesignators, 2316 Designators + Idx); 2317 --NumNewDesignators; 2318 return; 2319 } else if (NumNewDesignators == 1) { 2320 Designators[Idx] = *First; 2321 return; 2322 } 2323 2324 Designator *NewDesignators 2325 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2326 std::copy(Designators, Designators + Idx, NewDesignators); 2327 std::copy(First, Last, NewDesignators + Idx); 2328 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2329 NewDesignators + Idx + NumNewDesignators); 2330 DestroyDesignators(C); 2331 Designators = NewDesignators; 2332 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2333} 2334 2335void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2336 DestroyDesignators(C); 2337 Expr::DoDestroy(C); 2338} 2339 2340void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2341 for (unsigned I = 0; I != NumDesignators; ++I) 2342 Designators[I].~Designator(); 2343 C.Deallocate(Designators); 2344 Designators = 0; 2345} 2346 2347ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2348 Expr **exprs, unsigned nexprs, 2349 SourceLocation rparenloc) 2350: Expr(ParenListExprClass, QualType(), 2351 hasAnyTypeDependentArguments(exprs, nexprs), 2352 hasAnyValueDependentArguments(exprs, nexprs)), 2353 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2354 2355 Exprs = new (C) Stmt*[nexprs]; 2356 for (unsigned i = 0; i != nexprs; ++i) 2357 Exprs[i] = exprs[i]; 2358} 2359 2360void ParenListExpr::DoDestroy(ASTContext& C) { 2361 DestroyChildren(C); 2362 if (Exprs) C.Deallocate(Exprs); 2363 this->~ParenListExpr(); 2364 C.Deallocate(this); 2365} 2366 2367//===----------------------------------------------------------------------===// 2368// ExprIterator. 2369//===----------------------------------------------------------------------===// 2370 2371Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2372Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2373Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2374const Expr* ConstExprIterator::operator[](size_t idx) const { 2375 return cast<Expr>(I[idx]); 2376} 2377const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2378const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2379 2380//===----------------------------------------------------------------------===// 2381// Child Iterators for iterating over subexpressions/substatements 2382//===----------------------------------------------------------------------===// 2383 2384// DeclRefExpr 2385Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2386Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2387 2388// ObjCIvarRefExpr 2389Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2390Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2391 2392// ObjCPropertyRefExpr 2393Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2394Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2395 2396// ObjCImplicitSetterGetterRefExpr 2397Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2398 return &Base; 2399} 2400Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2401 return &Base+1; 2402} 2403 2404// ObjCSuperExpr 2405Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2406Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2407 2408// ObjCIsaExpr 2409Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2410Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2411 2412// PredefinedExpr 2413Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2414Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2415 2416// IntegerLiteral 2417Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2418Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2419 2420// CharacterLiteral 2421Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2422Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2423 2424// FloatingLiteral 2425Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2426Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2427 2428// ImaginaryLiteral 2429Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2430Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2431 2432// StringLiteral 2433Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2434Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2435 2436// ParenExpr 2437Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2438Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2439 2440// UnaryOperator 2441Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2442Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2443 2444// SizeOfAlignOfExpr 2445Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2446 // If this is of a type and the type is a VLA type (and not a typedef), the 2447 // size expression of the VLA needs to be treated as an executable expression. 2448 // Why isn't this weirdness documented better in StmtIterator? 2449 if (isArgumentType()) { 2450 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2451 getArgumentType().getTypePtr())) 2452 return child_iterator(T); 2453 return child_iterator(); 2454 } 2455 return child_iterator(&Argument.Ex); 2456} 2457Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2458 if (isArgumentType()) 2459 return child_iterator(); 2460 return child_iterator(&Argument.Ex + 1); 2461} 2462 2463// ArraySubscriptExpr 2464Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2465 return &SubExprs[0]; 2466} 2467Stmt::child_iterator ArraySubscriptExpr::child_end() { 2468 return &SubExprs[0]+END_EXPR; 2469} 2470 2471// CallExpr 2472Stmt::child_iterator CallExpr::child_begin() { 2473 return &SubExprs[0]; 2474} 2475Stmt::child_iterator CallExpr::child_end() { 2476 return &SubExprs[0]+NumArgs+ARGS_START; 2477} 2478 2479// MemberExpr 2480Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2481Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2482 2483// ExtVectorElementExpr 2484Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2485Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2486 2487// CompoundLiteralExpr 2488Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2489Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2490 2491// CastExpr 2492Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2493Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2494 2495// BinaryOperator 2496Stmt::child_iterator BinaryOperator::child_begin() { 2497 return &SubExprs[0]; 2498} 2499Stmt::child_iterator BinaryOperator::child_end() { 2500 return &SubExprs[0]+END_EXPR; 2501} 2502 2503// ConditionalOperator 2504Stmt::child_iterator ConditionalOperator::child_begin() { 2505 return &SubExprs[0]; 2506} 2507Stmt::child_iterator ConditionalOperator::child_end() { 2508 return &SubExprs[0]+END_EXPR; 2509} 2510 2511// AddrLabelExpr 2512Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2513Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2514 2515// StmtExpr 2516Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2517Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2518 2519// TypesCompatibleExpr 2520Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2521 return child_iterator(); 2522} 2523 2524Stmt::child_iterator TypesCompatibleExpr::child_end() { 2525 return child_iterator(); 2526} 2527 2528// ChooseExpr 2529Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2530Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2531 2532// GNUNullExpr 2533Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2534Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2535 2536// ShuffleVectorExpr 2537Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2538 return &SubExprs[0]; 2539} 2540Stmt::child_iterator ShuffleVectorExpr::child_end() { 2541 return &SubExprs[0]+NumExprs; 2542} 2543 2544// VAArgExpr 2545Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2546Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2547 2548// InitListExpr 2549Stmt::child_iterator InitListExpr::child_begin() { 2550 return InitExprs.size() ? &InitExprs[0] : 0; 2551} 2552Stmt::child_iterator InitListExpr::child_end() { 2553 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2554} 2555 2556// DesignatedInitExpr 2557Stmt::child_iterator DesignatedInitExpr::child_begin() { 2558 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2559 Ptr += sizeof(DesignatedInitExpr); 2560 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2561} 2562Stmt::child_iterator DesignatedInitExpr::child_end() { 2563 return child_iterator(&*child_begin() + NumSubExprs); 2564} 2565 2566// ImplicitValueInitExpr 2567Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2568 return child_iterator(); 2569} 2570 2571Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2572 return child_iterator(); 2573} 2574 2575// ParenListExpr 2576Stmt::child_iterator ParenListExpr::child_begin() { 2577 return &Exprs[0]; 2578} 2579Stmt::child_iterator ParenListExpr::child_end() { 2580 return &Exprs[0]+NumExprs; 2581} 2582 2583// ObjCStringLiteral 2584Stmt::child_iterator ObjCStringLiteral::child_begin() { 2585 return &String; 2586} 2587Stmt::child_iterator ObjCStringLiteral::child_end() { 2588 return &String+1; 2589} 2590 2591// ObjCEncodeExpr 2592Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2593Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2594 2595// ObjCSelectorExpr 2596Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2597 return child_iterator(); 2598} 2599Stmt::child_iterator ObjCSelectorExpr::child_end() { 2600 return child_iterator(); 2601} 2602 2603// ObjCProtocolExpr 2604Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2605 return child_iterator(); 2606} 2607Stmt::child_iterator ObjCProtocolExpr::child_end() { 2608 return child_iterator(); 2609} 2610 2611// ObjCMessageExpr 2612Stmt::child_iterator ObjCMessageExpr::child_begin() { 2613 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2614} 2615Stmt::child_iterator ObjCMessageExpr::child_end() { 2616 return &SubExprs[0]+ARGS_START+getNumArgs(); 2617} 2618 2619// Blocks 2620Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2621Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2622 2623Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2624Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2625