Expr.cpp revision 201361
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 Var->getInit() && 103 Var->getInit()->isValueDependent()) 104 ValueDependent = true; 105 } 106 // (TD) - a nested-name-specifier or a qualified-id that names a 107 // member of an unknown specialization. 108 // (handled by DependentScopeDeclRefExpr) 109} 110 111DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 112 SourceRange QualifierRange, 113 ValueDecl *D, SourceLocation NameLoc, 114 const TemplateArgumentListInfo *TemplateArgs, 115 QualType T) 116 : Expr(DeclRefExprClass, T, false, false), 117 DecoratedD(D, 118 (Qualifier? HasQualifierFlag : 0) | 119 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 120 Loc(NameLoc) { 121 if (Qualifier) { 122 NameQualifier *NQ = getNameQualifier(); 123 NQ->NNS = Qualifier; 124 NQ->Range = QualifierRange; 125 } 126 127 if (TemplateArgs) 128 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 129 130 computeDependence(); 131} 132 133DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 134 NestedNameSpecifier *Qualifier, 135 SourceRange QualifierRange, 136 ValueDecl *D, 137 SourceLocation NameLoc, 138 QualType T, 139 const TemplateArgumentListInfo *TemplateArgs) { 140 std::size_t Size = sizeof(DeclRefExpr); 141 if (Qualifier != 0) 142 Size += sizeof(NameQualifier); 143 144 if (TemplateArgs) 145 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 146 147 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 148 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 149 TemplateArgs, T); 150} 151 152SourceRange DeclRefExpr::getSourceRange() const { 153 // FIXME: Does not handle multi-token names well, e.g., operator[]. 154 SourceRange R(Loc); 155 156 if (hasQualifier()) 157 R.setBegin(getQualifierRange().getBegin()); 158 if (hasExplicitTemplateArgumentList()) 159 R.setEnd(getRAngleLoc()); 160 return R; 161} 162 163// FIXME: Maybe this should use DeclPrinter with a special "print predefined 164// expr" policy instead. 165std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 166 const Decl *CurrentDecl) { 167 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 168 if (IT != PrettyFunction) 169 return FD->getNameAsString(); 170 171 llvm::SmallString<256> Name; 172 llvm::raw_svector_ostream Out(Name); 173 174 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 175 if (MD->isVirtual()) 176 Out << "virtual "; 177 if (MD->isStatic()) 178 Out << "static "; 179 } 180 181 PrintingPolicy Policy(Context.getLangOptions()); 182 Policy.SuppressTagKind = true; 183 184 std::string Proto = FD->getQualifiedNameAsString(Policy); 185 186 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 187 const FunctionProtoType *FT = 0; 188 if (FD->hasWrittenPrototype()) 189 FT = dyn_cast<FunctionProtoType>(AFT); 190 191 Proto += "("; 192 if (FT) { 193 llvm::raw_string_ostream POut(Proto); 194 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 195 if (i) POut << ", "; 196 std::string Param; 197 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 198 POut << Param; 199 } 200 201 if (FT->isVariadic()) { 202 if (FD->getNumParams()) POut << ", "; 203 POut << "..."; 204 } 205 } 206 Proto += ")"; 207 208 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 209 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 210 if (ThisQuals.hasConst()) 211 Proto += " const"; 212 if (ThisQuals.hasVolatile()) 213 Proto += " volatile"; 214 } 215 216 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 217 AFT->getResultType().getAsStringInternal(Proto, Policy); 218 219 Out << Proto; 220 221 Out.flush(); 222 return Name.str().str(); 223 } 224 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 225 llvm::SmallString<256> Name; 226 llvm::raw_svector_ostream Out(Name); 227 Out << (MD->isInstanceMethod() ? '-' : '+'); 228 Out << '['; 229 Out << MD->getClassInterface()->getNameAsString(); 230 if (const ObjCCategoryImplDecl *CID = 231 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 232 Out << '('; 233 Out << CID->getNameAsString(); 234 Out << ')'; 235 } 236 Out << ' '; 237 Out << MD->getSelector().getAsString(); 238 Out << ']'; 239 240 Out.flush(); 241 return Name.str().str(); 242 } 243 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 244 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 245 return "top level"; 246 } 247 return ""; 248} 249 250/// getValueAsApproximateDouble - This returns the value as an inaccurate 251/// double. Note that this may cause loss of precision, but is useful for 252/// debugging dumps, etc. 253double FloatingLiteral::getValueAsApproximateDouble() const { 254 llvm::APFloat V = getValue(); 255 bool ignored; 256 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 257 &ignored); 258 return V.convertToDouble(); 259} 260 261StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 262 unsigned ByteLength, bool Wide, 263 QualType Ty, 264 const SourceLocation *Loc, 265 unsigned NumStrs) { 266 // Allocate enough space for the StringLiteral plus an array of locations for 267 // any concatenated string tokens. 268 void *Mem = C.Allocate(sizeof(StringLiteral)+ 269 sizeof(SourceLocation)*(NumStrs-1), 270 llvm::alignof<StringLiteral>()); 271 StringLiteral *SL = new (Mem) StringLiteral(Ty); 272 273 // OPTIMIZE: could allocate this appended to the StringLiteral. 274 char *AStrData = new (C, 1) char[ByteLength]; 275 memcpy(AStrData, StrData, ByteLength); 276 SL->StrData = AStrData; 277 SL->ByteLength = ByteLength; 278 SL->IsWide = Wide; 279 SL->TokLocs[0] = Loc[0]; 280 SL->NumConcatenated = NumStrs; 281 282 if (NumStrs != 1) 283 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 284 return SL; 285} 286 287StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 288 void *Mem = C.Allocate(sizeof(StringLiteral)+ 289 sizeof(SourceLocation)*(NumStrs-1), 290 llvm::alignof<StringLiteral>()); 291 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 292 SL->StrData = 0; 293 SL->ByteLength = 0; 294 SL->NumConcatenated = NumStrs; 295 return SL; 296} 297 298void StringLiteral::DoDestroy(ASTContext &C) { 299 C.Deallocate(const_cast<char*>(StrData)); 300 Expr::DoDestroy(C); 301} 302 303void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 304 if (StrData) 305 C.Deallocate(const_cast<char*>(StrData)); 306 307 char *AStrData = new (C, 1) char[Str.size()]; 308 memcpy(AStrData, Str.data(), Str.size()); 309 StrData = AStrData; 310 ByteLength = Str.size(); 311} 312 313/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 314/// corresponds to, e.g. "sizeof" or "[pre]++". 315const char *UnaryOperator::getOpcodeStr(Opcode Op) { 316 switch (Op) { 317 default: assert(0 && "Unknown unary operator"); 318 case PostInc: return "++"; 319 case PostDec: return "--"; 320 case PreInc: return "++"; 321 case PreDec: return "--"; 322 case AddrOf: return "&"; 323 case Deref: return "*"; 324 case Plus: return "+"; 325 case Minus: return "-"; 326 case Not: return "~"; 327 case LNot: return "!"; 328 case Real: return "__real"; 329 case Imag: return "__imag"; 330 case Extension: return "__extension__"; 331 case OffsetOf: return "__builtin_offsetof"; 332 } 333} 334 335UnaryOperator::Opcode 336UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 337 switch (OO) { 338 default: assert(false && "No unary operator for overloaded function"); 339 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 340 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 341 case OO_Amp: return AddrOf; 342 case OO_Star: return Deref; 343 case OO_Plus: return Plus; 344 case OO_Minus: return Minus; 345 case OO_Tilde: return Not; 346 case OO_Exclaim: return LNot; 347 } 348} 349 350OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 351 switch (Opc) { 352 case PostInc: case PreInc: return OO_PlusPlus; 353 case PostDec: case PreDec: return OO_MinusMinus; 354 case AddrOf: return OO_Amp; 355 case Deref: return OO_Star; 356 case Plus: return OO_Plus; 357 case Minus: return OO_Minus; 358 case Not: return OO_Tilde; 359 case LNot: return OO_Exclaim; 360 default: return OO_None; 361 } 362} 363 364 365//===----------------------------------------------------------------------===// 366// Postfix Operators. 367//===----------------------------------------------------------------------===// 368 369CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 370 unsigned numargs, QualType t, SourceLocation rparenloc) 371 : Expr(SC, t, 372 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 373 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 374 NumArgs(numargs) { 375 376 SubExprs = new (C) Stmt*[numargs+1]; 377 SubExprs[FN] = fn; 378 for (unsigned i = 0; i != numargs; ++i) 379 SubExprs[i+ARGS_START] = args[i]; 380 381 RParenLoc = rparenloc; 382} 383 384CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 385 QualType t, SourceLocation rparenloc) 386 : Expr(CallExprClass, t, 387 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 388 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 389 NumArgs(numargs) { 390 391 SubExprs = new (C) Stmt*[numargs+1]; 392 SubExprs[FN] = fn; 393 for (unsigned i = 0; i != numargs; ++i) 394 SubExprs[i+ARGS_START] = args[i]; 395 396 RParenLoc = rparenloc; 397} 398 399CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 400 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 401 SubExprs = new (C) Stmt*[1]; 402} 403 404void CallExpr::DoDestroy(ASTContext& C) { 405 DestroyChildren(C); 406 if (SubExprs) C.Deallocate(SubExprs); 407 this->~CallExpr(); 408 C.Deallocate(this); 409} 410 411Decl *CallExpr::getCalleeDecl() { 412 Expr *CEE = getCallee()->IgnoreParenCasts(); 413 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 414 return DRE->getDecl(); 415 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 416 return ME->getMemberDecl(); 417 418 return 0; 419} 420 421FunctionDecl *CallExpr::getDirectCallee() { 422 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 423} 424 425/// setNumArgs - This changes the number of arguments present in this call. 426/// Any orphaned expressions are deleted by this, and any new operands are set 427/// to null. 428void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 429 // No change, just return. 430 if (NumArgs == getNumArgs()) return; 431 432 // If shrinking # arguments, just delete the extras and forgot them. 433 if (NumArgs < getNumArgs()) { 434 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 435 getArg(i)->Destroy(C); 436 this->NumArgs = NumArgs; 437 return; 438 } 439 440 // Otherwise, we are growing the # arguments. New an bigger argument array. 441 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 442 // Copy over args. 443 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 444 NewSubExprs[i] = SubExprs[i]; 445 // Null out new args. 446 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 447 NewSubExprs[i] = 0; 448 449 if (SubExprs) C.Deallocate(SubExprs); 450 SubExprs = NewSubExprs; 451 this->NumArgs = NumArgs; 452} 453 454/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 455/// not, return 0. 456unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 457 // All simple function calls (e.g. func()) are implicitly cast to pointer to 458 // function. As a result, we try and obtain the DeclRefExpr from the 459 // ImplicitCastExpr. 460 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 461 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 462 return 0; 463 464 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 465 if (!DRE) 466 return 0; 467 468 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 469 if (!FDecl) 470 return 0; 471 472 if (!FDecl->getIdentifier()) 473 return 0; 474 475 return FDecl->getBuiltinID(); 476} 477 478QualType CallExpr::getCallReturnType() const { 479 QualType CalleeType = getCallee()->getType(); 480 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 481 CalleeType = FnTypePtr->getPointeeType(); 482 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 483 CalleeType = BPT->getPointeeType(); 484 485 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 486 return FnType->getResultType(); 487} 488 489MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 490 SourceRange qualrange, ValueDecl *memberdecl, 491 SourceLocation l, const TemplateArgumentListInfo *targs, 492 QualType ty) 493 : Expr(MemberExprClass, ty, 494 base->isTypeDependent() || (qual && qual->isDependent()), 495 base->isValueDependent() || (qual && qual->isDependent())), 496 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 497 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 498 // Initialize the qualifier, if any. 499 if (HasQualifier) { 500 NameQualifier *NQ = getMemberQualifier(); 501 NQ->NNS = qual; 502 NQ->Range = qualrange; 503 } 504 505 // Initialize the explicit template argument list, if any. 506 if (targs) 507 getExplicitTemplateArgumentList()->initializeFrom(*targs); 508} 509 510MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 511 NestedNameSpecifier *qual, 512 SourceRange qualrange, 513 ValueDecl *memberdecl, 514 SourceLocation l, 515 const TemplateArgumentListInfo *targs, 516 QualType ty) { 517 std::size_t Size = sizeof(MemberExpr); 518 if (qual != 0) 519 Size += sizeof(NameQualifier); 520 521 if (targs) 522 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 523 524 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 525 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 526 targs, ty); 527} 528 529const char *CastExpr::getCastKindName() const { 530 switch (getCastKind()) { 531 case CastExpr::CK_Unknown: 532 return "Unknown"; 533 case CastExpr::CK_BitCast: 534 return "BitCast"; 535 case CastExpr::CK_NoOp: 536 return "NoOp"; 537 case CastExpr::CK_BaseToDerived: 538 return "BaseToDerived"; 539 case CastExpr::CK_DerivedToBase: 540 return "DerivedToBase"; 541 case CastExpr::CK_Dynamic: 542 return "Dynamic"; 543 case CastExpr::CK_ToUnion: 544 return "ToUnion"; 545 case CastExpr::CK_ArrayToPointerDecay: 546 return "ArrayToPointerDecay"; 547 case CastExpr::CK_FunctionToPointerDecay: 548 return "FunctionToPointerDecay"; 549 case CastExpr::CK_NullToMemberPointer: 550 return "NullToMemberPointer"; 551 case CastExpr::CK_BaseToDerivedMemberPointer: 552 return "BaseToDerivedMemberPointer"; 553 case CastExpr::CK_DerivedToBaseMemberPointer: 554 return "DerivedToBaseMemberPointer"; 555 case CastExpr::CK_UserDefinedConversion: 556 return "UserDefinedConversion"; 557 case CastExpr::CK_ConstructorConversion: 558 return "ConstructorConversion"; 559 case CastExpr::CK_IntegralToPointer: 560 return "IntegralToPointer"; 561 case CastExpr::CK_PointerToIntegral: 562 return "PointerToIntegral"; 563 case CastExpr::CK_ToVoid: 564 return "ToVoid"; 565 case CastExpr::CK_VectorSplat: 566 return "VectorSplat"; 567 case CastExpr::CK_IntegralCast: 568 return "IntegralCast"; 569 case CastExpr::CK_IntegralToFloating: 570 return "IntegralToFloating"; 571 case CastExpr::CK_FloatingToIntegral: 572 return "FloatingToIntegral"; 573 case CastExpr::CK_FloatingCast: 574 return "FloatingCast"; 575 case CastExpr::CK_MemberPointerToBoolean: 576 return "MemberPointerToBoolean"; 577 case CastExpr::CK_AnyPointerToObjCPointerCast: 578 return "AnyPointerToObjCPointerCast"; 579 case CastExpr::CK_AnyPointerToBlockPointerCast: 580 return "AnyPointerToBlockPointerCast"; 581 } 582 583 assert(0 && "Unhandled cast kind!"); 584 return 0; 585} 586 587Expr *CastExpr::getSubExprAsWritten() { 588 Expr *SubExpr = 0; 589 CastExpr *E = this; 590 do { 591 SubExpr = E->getSubExpr(); 592 593 // Skip any temporary bindings; they're implicit. 594 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 595 SubExpr = Binder->getSubExpr(); 596 597 // Conversions by constructor and conversion functions have a 598 // subexpression describing the call; strip it off. 599 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 600 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 601 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 602 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 603 604 // If the subexpression we're left with is an implicit cast, look 605 // through that, too. 606 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 607 608 return SubExpr; 609} 610 611/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 612/// corresponds to, e.g. "<<=". 613const char *BinaryOperator::getOpcodeStr(Opcode Op) { 614 switch (Op) { 615 case PtrMemD: return ".*"; 616 case PtrMemI: return "->*"; 617 case Mul: return "*"; 618 case Div: return "/"; 619 case Rem: return "%"; 620 case Add: return "+"; 621 case Sub: return "-"; 622 case Shl: return "<<"; 623 case Shr: return ">>"; 624 case LT: return "<"; 625 case GT: return ">"; 626 case LE: return "<="; 627 case GE: return ">="; 628 case EQ: return "=="; 629 case NE: return "!="; 630 case And: return "&"; 631 case Xor: return "^"; 632 case Or: return "|"; 633 case LAnd: return "&&"; 634 case LOr: return "||"; 635 case Assign: return "="; 636 case MulAssign: return "*="; 637 case DivAssign: return "/="; 638 case RemAssign: return "%="; 639 case AddAssign: return "+="; 640 case SubAssign: return "-="; 641 case ShlAssign: return "<<="; 642 case ShrAssign: return ">>="; 643 case AndAssign: return "&="; 644 case XorAssign: return "^="; 645 case OrAssign: return "|="; 646 case Comma: return ","; 647 } 648 649 return ""; 650} 651 652BinaryOperator::Opcode 653BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 654 switch (OO) { 655 default: assert(false && "Not an overloadable binary operator"); 656 case OO_Plus: return Add; 657 case OO_Minus: return Sub; 658 case OO_Star: return Mul; 659 case OO_Slash: return Div; 660 case OO_Percent: return Rem; 661 case OO_Caret: return Xor; 662 case OO_Amp: return And; 663 case OO_Pipe: return Or; 664 case OO_Equal: return Assign; 665 case OO_Less: return LT; 666 case OO_Greater: return GT; 667 case OO_PlusEqual: return AddAssign; 668 case OO_MinusEqual: return SubAssign; 669 case OO_StarEqual: return MulAssign; 670 case OO_SlashEqual: return DivAssign; 671 case OO_PercentEqual: return RemAssign; 672 case OO_CaretEqual: return XorAssign; 673 case OO_AmpEqual: return AndAssign; 674 case OO_PipeEqual: return OrAssign; 675 case OO_LessLess: return Shl; 676 case OO_GreaterGreater: return Shr; 677 case OO_LessLessEqual: return ShlAssign; 678 case OO_GreaterGreaterEqual: return ShrAssign; 679 case OO_EqualEqual: return EQ; 680 case OO_ExclaimEqual: return NE; 681 case OO_LessEqual: return LE; 682 case OO_GreaterEqual: return GE; 683 case OO_AmpAmp: return LAnd; 684 case OO_PipePipe: return LOr; 685 case OO_Comma: return Comma; 686 case OO_ArrowStar: return PtrMemI; 687 } 688} 689 690OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 691 static const OverloadedOperatorKind OverOps[] = { 692 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 693 OO_Star, OO_Slash, OO_Percent, 694 OO_Plus, OO_Minus, 695 OO_LessLess, OO_GreaterGreater, 696 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 697 OO_EqualEqual, OO_ExclaimEqual, 698 OO_Amp, 699 OO_Caret, 700 OO_Pipe, 701 OO_AmpAmp, 702 OO_PipePipe, 703 OO_Equal, OO_StarEqual, 704 OO_SlashEqual, OO_PercentEqual, 705 OO_PlusEqual, OO_MinusEqual, 706 OO_LessLessEqual, OO_GreaterGreaterEqual, 707 OO_AmpEqual, OO_CaretEqual, 708 OO_PipeEqual, 709 OO_Comma 710 }; 711 return OverOps[Opc]; 712} 713 714InitListExpr::InitListExpr(SourceLocation lbraceloc, 715 Expr **initExprs, unsigned numInits, 716 SourceLocation rbraceloc) 717 : Expr(InitListExprClass, QualType(), false, false), 718 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 719 UnionFieldInit(0), HadArrayRangeDesignator(false) 720{ 721 for (unsigned I = 0; I != numInits; ++I) { 722 if (initExprs[I]->isTypeDependent()) 723 TypeDependent = true; 724 if (initExprs[I]->isValueDependent()) 725 ValueDependent = true; 726 } 727 728 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 729} 730 731void InitListExpr::reserveInits(unsigned NumInits) { 732 if (NumInits > InitExprs.size()) 733 InitExprs.reserve(NumInits); 734} 735 736void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 737 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 738 Idx < LastIdx; ++Idx) 739 InitExprs[Idx]->Destroy(Context); 740 InitExprs.resize(NumInits, 0); 741} 742 743Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 744 if (Init >= InitExprs.size()) { 745 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 746 InitExprs.back() = expr; 747 return 0; 748 } 749 750 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 751 InitExprs[Init] = expr; 752 return Result; 753} 754 755/// getFunctionType - Return the underlying function type for this block. 756/// 757const FunctionType *BlockExpr::getFunctionType() const { 758 return getType()->getAs<BlockPointerType>()-> 759 getPointeeType()->getAs<FunctionType>(); 760} 761 762SourceLocation BlockExpr::getCaretLocation() const { 763 return TheBlock->getCaretLocation(); 764} 765const Stmt *BlockExpr::getBody() const { 766 return TheBlock->getBody(); 767} 768Stmt *BlockExpr::getBody() { 769 return TheBlock->getBody(); 770} 771 772 773//===----------------------------------------------------------------------===// 774// Generic Expression Routines 775//===----------------------------------------------------------------------===// 776 777/// isUnusedResultAWarning - Return true if this immediate expression should 778/// be warned about if the result is unused. If so, fill in Loc and Ranges 779/// with location to warn on and the source range[s] to report with the 780/// warning. 781bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 782 SourceRange &R2, ASTContext &Ctx) const { 783 // Don't warn if the expr is type dependent. The type could end up 784 // instantiating to void. 785 if (isTypeDependent()) 786 return false; 787 788 switch (getStmtClass()) { 789 default: 790 Loc = getExprLoc(); 791 R1 = getSourceRange(); 792 return true; 793 case ParenExprClass: 794 return cast<ParenExpr>(this)->getSubExpr()-> 795 isUnusedResultAWarning(Loc, R1, R2, Ctx); 796 case UnaryOperatorClass: { 797 const UnaryOperator *UO = cast<UnaryOperator>(this); 798 799 switch (UO->getOpcode()) { 800 default: break; 801 case UnaryOperator::PostInc: 802 case UnaryOperator::PostDec: 803 case UnaryOperator::PreInc: 804 case UnaryOperator::PreDec: // ++/-- 805 return false; // Not a warning. 806 case UnaryOperator::Deref: 807 // Dereferencing a volatile pointer is a side-effect. 808 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 809 return false; 810 break; 811 case UnaryOperator::Real: 812 case UnaryOperator::Imag: 813 // accessing a piece of a volatile complex is a side-effect. 814 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 815 .isVolatileQualified()) 816 return false; 817 break; 818 case UnaryOperator::Extension: 819 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 820 } 821 Loc = UO->getOperatorLoc(); 822 R1 = UO->getSubExpr()->getSourceRange(); 823 return true; 824 } 825 case BinaryOperatorClass: { 826 const BinaryOperator *BO = cast<BinaryOperator>(this); 827 // Consider comma to have side effects if the LHS or RHS does. 828 if (BO->getOpcode() == BinaryOperator::Comma) 829 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 830 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 831 832 if (BO->isAssignmentOp()) 833 return false; 834 Loc = BO->getOperatorLoc(); 835 R1 = BO->getLHS()->getSourceRange(); 836 R2 = BO->getRHS()->getSourceRange(); 837 return true; 838 } 839 case CompoundAssignOperatorClass: 840 return false; 841 842 case ConditionalOperatorClass: { 843 // The condition must be evaluated, but if either the LHS or RHS is a 844 // warning, warn about them. 845 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 846 if (Exp->getLHS() && 847 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 848 return true; 849 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 850 } 851 852 case MemberExprClass: 853 // If the base pointer or element is to a volatile pointer/field, accessing 854 // it is a side effect. 855 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 856 return false; 857 Loc = cast<MemberExpr>(this)->getMemberLoc(); 858 R1 = SourceRange(Loc, Loc); 859 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 860 return true; 861 862 case ArraySubscriptExprClass: 863 // If the base pointer or element is to a volatile pointer/field, accessing 864 // it is a side effect. 865 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 866 return false; 867 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 868 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 869 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 870 return true; 871 872 case CallExprClass: 873 case CXXOperatorCallExprClass: 874 case CXXMemberCallExprClass: { 875 // If this is a direct call, get the callee. 876 const CallExpr *CE = cast<CallExpr>(this); 877 if (const Decl *FD = CE->getCalleeDecl()) { 878 // If the callee has attribute pure, const, or warn_unused_result, warn 879 // about it. void foo() { strlen("bar"); } should warn. 880 // 881 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 882 // updated to match for QoI. 883 if (FD->getAttr<WarnUnusedResultAttr>() || 884 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 885 Loc = CE->getCallee()->getLocStart(); 886 R1 = CE->getCallee()->getSourceRange(); 887 888 if (unsigned NumArgs = CE->getNumArgs()) 889 R2 = SourceRange(CE->getArg(0)->getLocStart(), 890 CE->getArg(NumArgs-1)->getLocEnd()); 891 return true; 892 } 893 } 894 return false; 895 } 896 897 case CXXTemporaryObjectExprClass: 898 case CXXConstructExprClass: 899 return false; 900 901 case ObjCMessageExprClass: 902 return false; 903 904 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 905#if 0 906 const ObjCImplicitSetterGetterRefExpr *Ref = 907 cast<ObjCImplicitSetterGetterRefExpr>(this); 908 // FIXME: We really want the location of the '.' here. 909 Loc = Ref->getLocation(); 910 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 911 if (Ref->getBase()) 912 R2 = Ref->getBase()->getSourceRange(); 913#else 914 Loc = getExprLoc(); 915 R1 = getSourceRange(); 916#endif 917 return true; 918 } 919 case StmtExprClass: { 920 // Statement exprs don't logically have side effects themselves, but are 921 // sometimes used in macros in ways that give them a type that is unused. 922 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 923 // however, if the result of the stmt expr is dead, we don't want to emit a 924 // warning. 925 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 926 if (!CS->body_empty()) 927 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 928 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 929 930 Loc = cast<StmtExpr>(this)->getLParenLoc(); 931 R1 = getSourceRange(); 932 return true; 933 } 934 case CStyleCastExprClass: 935 // If this is an explicit cast to void, allow it. People do this when they 936 // think they know what they're doing :). 937 if (getType()->isVoidType()) 938 return false; 939 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 940 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 941 return true; 942 case CXXFunctionalCastExprClass: { 943 const CastExpr *CE = cast<CastExpr>(this); 944 945 // If this is a cast to void or a constructor conversion, check the operand. 946 // Otherwise, the result of the cast is unused. 947 if (CE->getCastKind() == CastExpr::CK_ToVoid || 948 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 949 return (cast<CastExpr>(this)->getSubExpr() 950 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 951 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 952 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 953 return true; 954 } 955 956 case ImplicitCastExprClass: 957 // Check the operand, since implicit casts are inserted by Sema 958 return (cast<ImplicitCastExpr>(this) 959 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 960 961 case CXXDefaultArgExprClass: 962 return (cast<CXXDefaultArgExpr>(this) 963 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 964 965 case CXXNewExprClass: 966 // FIXME: In theory, there might be new expressions that don't have side 967 // effects (e.g. a placement new with an uninitialized POD). 968 case CXXDeleteExprClass: 969 return false; 970 case CXXBindTemporaryExprClass: 971 return (cast<CXXBindTemporaryExpr>(this) 972 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 973 case CXXExprWithTemporariesClass: 974 return (cast<CXXExprWithTemporaries>(this) 975 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 976 } 977} 978 979/// DeclCanBeLvalue - Determine whether the given declaration can be 980/// an lvalue. This is a helper routine for isLvalue. 981static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 982 // C++ [temp.param]p6: 983 // A non-type non-reference template-parameter is not an lvalue. 984 if (const NonTypeTemplateParmDecl *NTTParm 985 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 986 return NTTParm->getType()->isReferenceType(); 987 988 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 989 // C++ 3.10p2: An lvalue refers to an object or function. 990 (Ctx.getLangOptions().CPlusPlus && 991 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 992} 993 994/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 995/// incomplete type other than void. Nonarray expressions that can be lvalues: 996/// - name, where name must be a variable 997/// - e[i] 998/// - (e), where e must be an lvalue 999/// - e.name, where e must be an lvalue 1000/// - e->name 1001/// - *e, the type of e cannot be a function type 1002/// - string-constant 1003/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1004/// - reference type [C++ [expr]] 1005/// 1006Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1007 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1008 1009 isLvalueResult Res = isLvalueInternal(Ctx); 1010 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1011 return Res; 1012 1013 // first, check the type (C99 6.3.2.1). Expressions with function 1014 // type in C are not lvalues, but they can be lvalues in C++. 1015 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1016 return LV_NotObjectType; 1017 1018 // Allow qualified void which is an incomplete type other than void (yuck). 1019 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1020 return LV_IncompleteVoidType; 1021 1022 return LV_Valid; 1023} 1024 1025// Check whether the expression can be sanely treated like an l-value 1026Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1027 switch (getStmtClass()) { 1028 case ObjCIsaExprClass: 1029 case StringLiteralClass: // C99 6.5.1p4 1030 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1031 return LV_Valid; 1032 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1033 // For vectors, make sure base is an lvalue (i.e. not a function call). 1034 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1035 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1036 return LV_Valid; 1037 case DeclRefExprClass: { // C99 6.5.1p2 1038 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1039 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1040 return LV_Valid; 1041 break; 1042 } 1043 case BlockDeclRefExprClass: { 1044 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1045 if (isa<VarDecl>(BDR->getDecl())) 1046 return LV_Valid; 1047 break; 1048 } 1049 case MemberExprClass: { 1050 const MemberExpr *m = cast<MemberExpr>(this); 1051 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1052 NamedDecl *Member = m->getMemberDecl(); 1053 // C++ [expr.ref]p4: 1054 // If E2 is declared to have type "reference to T", then E1.E2 1055 // is an lvalue. 1056 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1057 if (Value->getType()->isReferenceType()) 1058 return LV_Valid; 1059 1060 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1061 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1062 return LV_Valid; 1063 1064 // -- If E2 is a non-static data member [...]. If E1 is an 1065 // lvalue, then E1.E2 is an lvalue. 1066 if (isa<FieldDecl>(Member)) { 1067 if (m->isArrow()) 1068 return LV_Valid; 1069 Expr *BaseExp = m->getBase(); 1070 return (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) ? 1071 LV_SubObjCPropertySetting : BaseExp->isLvalue(Ctx); 1072 } 1073 1074 // -- If it refers to a static member function [...], then 1075 // E1.E2 is an lvalue. 1076 // -- Otherwise, if E1.E2 refers to a non-static member 1077 // function [...], then E1.E2 is not an lvalue. 1078 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1079 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1080 1081 // -- If E2 is a member enumerator [...], the expression E1.E2 1082 // is not an lvalue. 1083 if (isa<EnumConstantDecl>(Member)) 1084 return LV_InvalidExpression; 1085 1086 // Not an lvalue. 1087 return LV_InvalidExpression; 1088 } 1089 1090 // C99 6.5.2.3p4 1091 if (m->isArrow()) 1092 return LV_Valid; 1093 Expr *BaseExp = m->getBase(); 1094 return (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) ? 1095 LV_SubObjCPropertySetting : BaseExp->isLvalue(Ctx); 1096 } 1097 case UnaryOperatorClass: 1098 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1099 return LV_Valid; // C99 6.5.3p4 1100 1101 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1102 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1103 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1104 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1105 1106 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1107 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1108 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1109 return LV_Valid; 1110 break; 1111 case ImplicitCastExprClass: 1112 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1113 : LV_InvalidExpression; 1114 case ParenExprClass: // C99 6.5.1p5 1115 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1116 case BinaryOperatorClass: 1117 case CompoundAssignOperatorClass: { 1118 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1119 1120 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1121 BinOp->getOpcode() == BinaryOperator::Comma) 1122 return BinOp->getRHS()->isLvalue(Ctx); 1123 1124 // C++ [expr.mptr.oper]p6 1125 // The result of a .* expression is an lvalue only if its first operand is 1126 // an lvalue and its second operand is a pointer to data member. 1127 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1128 !BinOp->getType()->isFunctionType()) 1129 return BinOp->getLHS()->isLvalue(Ctx); 1130 1131 // The result of an ->* expression is an lvalue only if its second operand 1132 // is a pointer to data member. 1133 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1134 !BinOp->getType()->isFunctionType()) { 1135 QualType Ty = BinOp->getRHS()->getType(); 1136 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1137 return LV_Valid; 1138 } 1139 1140 if (!BinOp->isAssignmentOp()) 1141 return LV_InvalidExpression; 1142 1143 if (Ctx.getLangOptions().CPlusPlus) 1144 // C++ [expr.ass]p1: 1145 // The result of an assignment operation [...] is an lvalue. 1146 return LV_Valid; 1147 1148 1149 // C99 6.5.16: 1150 // An assignment expression [...] is not an lvalue. 1151 return LV_InvalidExpression; 1152 } 1153 case CallExprClass: 1154 case CXXOperatorCallExprClass: 1155 case CXXMemberCallExprClass: { 1156 // C++0x [expr.call]p10 1157 // A function call is an lvalue if and only if the result type 1158 // is an lvalue reference. 1159 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1160 if (ReturnType->isLValueReferenceType()) 1161 return LV_Valid; 1162 1163 break; 1164 } 1165 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1166 return LV_Valid; 1167 case ChooseExprClass: 1168 // __builtin_choose_expr is an lvalue if the selected operand is. 1169 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1170 case ExtVectorElementExprClass: 1171 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1172 return LV_DuplicateVectorComponents; 1173 return LV_Valid; 1174 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1175 return LV_Valid; 1176 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1177 return LV_Valid; 1178 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1179 return LV_Valid; 1180 case PredefinedExprClass: 1181 return LV_Valid; 1182 case UnresolvedLookupExprClass: 1183 return LV_Valid; 1184 case CXXDefaultArgExprClass: 1185 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1186 case CStyleCastExprClass: 1187 case CXXFunctionalCastExprClass: 1188 case CXXStaticCastExprClass: 1189 case CXXDynamicCastExprClass: 1190 case CXXReinterpretCastExprClass: 1191 case CXXConstCastExprClass: 1192 // The result of an explicit cast is an lvalue if the type we are 1193 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1194 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1195 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1196 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1197 isLValueReferenceType()) 1198 return LV_Valid; 1199 break; 1200 case CXXTypeidExprClass: 1201 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1202 return LV_Valid; 1203 case CXXBindTemporaryExprClass: 1204 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1205 isLvalueInternal(Ctx); 1206 case ConditionalOperatorClass: { 1207 // Complicated handling is only for C++. 1208 if (!Ctx.getLangOptions().CPlusPlus) 1209 return LV_InvalidExpression; 1210 1211 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1212 // everywhere there's an object converted to an rvalue. Also, any other 1213 // casts should be wrapped by ImplicitCastExprs. There's just the special 1214 // case involving throws to work out. 1215 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1216 Expr *True = Cond->getTrueExpr(); 1217 Expr *False = Cond->getFalseExpr(); 1218 // C++0x 5.16p2 1219 // If either the second or the third operand has type (cv) void, [...] 1220 // the result [...] is an rvalue. 1221 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1222 return LV_InvalidExpression; 1223 1224 // Both sides must be lvalues for the result to be an lvalue. 1225 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1226 return LV_InvalidExpression; 1227 1228 // That's it. 1229 return LV_Valid; 1230 } 1231 1232 case Expr::CXXExprWithTemporariesClass: 1233 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1234 1235 case Expr::ObjCMessageExprClass: 1236 if (const ObjCMethodDecl *Method 1237 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1238 if (Method->getResultType()->isLValueReferenceType()) 1239 return LV_Valid; 1240 break; 1241 1242 default: 1243 break; 1244 } 1245 return LV_InvalidExpression; 1246} 1247 1248/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1249/// does not have an incomplete type, does not have a const-qualified type, and 1250/// if it is a structure or union, does not have any member (including, 1251/// recursively, any member or element of all contained aggregates or unions) 1252/// with a const-qualified type. 1253Expr::isModifiableLvalueResult 1254Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1255 isLvalueResult lvalResult = isLvalue(Ctx); 1256 1257 switch (lvalResult) { 1258 case LV_Valid: 1259 // C++ 3.10p11: Functions cannot be modified, but pointers to 1260 // functions can be modifiable. 1261 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1262 return MLV_NotObjectType; 1263 break; 1264 1265 case LV_NotObjectType: return MLV_NotObjectType; 1266 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1267 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1268 case LV_InvalidExpression: 1269 // If the top level is a C-style cast, and the subexpression is a valid 1270 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1271 // GCC extension. We don't support it, but we want to produce good 1272 // diagnostics when it happens so that the user knows why. 1273 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1274 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1275 if (Loc) 1276 *Loc = CE->getLParenLoc(); 1277 return MLV_LValueCast; 1278 } 1279 } 1280 return MLV_InvalidExpression; 1281 case LV_MemberFunction: return MLV_MemberFunction; 1282 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1283 } 1284 1285 // The following is illegal: 1286 // void takeclosure(void (^C)(void)); 1287 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1288 // 1289 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1290 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1291 return MLV_NotBlockQualified; 1292 } 1293 1294 // Assigning to an 'implicit' property? 1295 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1296 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1297 if (Expr->getSetterMethod() == 0) 1298 return MLV_NoSetterProperty; 1299 } 1300 1301 QualType CT = Ctx.getCanonicalType(getType()); 1302 1303 if (CT.isConstQualified()) 1304 return MLV_ConstQualified; 1305 if (CT->isArrayType()) 1306 return MLV_ArrayType; 1307 if (CT->isIncompleteType()) 1308 return MLV_IncompleteType; 1309 1310 if (const RecordType *r = CT->getAs<RecordType>()) { 1311 if (r->hasConstFields()) 1312 return MLV_ConstQualified; 1313 } 1314 1315 return MLV_Valid; 1316} 1317 1318/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1319/// returns true, if it is; false otherwise. 1320bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1321 switch (getStmtClass()) { 1322 default: 1323 return false; 1324 case ObjCIvarRefExprClass: 1325 return true; 1326 case Expr::UnaryOperatorClass: 1327 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1328 case ParenExprClass: 1329 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1330 case ImplicitCastExprClass: 1331 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1332 case CStyleCastExprClass: 1333 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1334 case DeclRefExprClass: { 1335 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1336 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1337 if (VD->hasGlobalStorage()) 1338 return true; 1339 QualType T = VD->getType(); 1340 // dereferencing to a pointer is always a gc'able candidate, 1341 // unless it is __weak. 1342 return T->isPointerType() && 1343 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1344 } 1345 return false; 1346 } 1347 case MemberExprClass: { 1348 const MemberExpr *M = cast<MemberExpr>(this); 1349 return M->getBase()->isOBJCGCCandidate(Ctx); 1350 } 1351 case ArraySubscriptExprClass: 1352 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1353 } 1354} 1355Expr* Expr::IgnoreParens() { 1356 Expr* E = this; 1357 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1358 E = P->getSubExpr(); 1359 1360 return E; 1361} 1362 1363/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1364/// or CastExprs or ImplicitCastExprs, returning their operand. 1365Expr *Expr::IgnoreParenCasts() { 1366 Expr *E = this; 1367 while (true) { 1368 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1369 E = P->getSubExpr(); 1370 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1371 E = P->getSubExpr(); 1372 else 1373 return E; 1374 } 1375} 1376 1377/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1378/// value (including ptr->int casts of the same size). Strip off any 1379/// ParenExpr or CastExprs, returning their operand. 1380Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1381 Expr *E = this; 1382 while (true) { 1383 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1384 E = P->getSubExpr(); 1385 continue; 1386 } 1387 1388 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1389 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1390 // ptr<->int casts of the same width. We also ignore all identify casts. 1391 Expr *SE = P->getSubExpr(); 1392 1393 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1394 E = SE; 1395 continue; 1396 } 1397 1398 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1399 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1400 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1401 E = SE; 1402 continue; 1403 } 1404 } 1405 1406 return E; 1407 } 1408} 1409 1410bool Expr::isDefaultArgument() const { 1411 const Expr *E = this; 1412 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1413 E = ICE->getSubExprAsWritten(); 1414 1415 return isa<CXXDefaultArgExpr>(E); 1416} 1417 1418/// hasAnyTypeDependentArguments - Determines if any of the expressions 1419/// in Exprs is type-dependent. 1420bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1421 for (unsigned I = 0; I < NumExprs; ++I) 1422 if (Exprs[I]->isTypeDependent()) 1423 return true; 1424 1425 return false; 1426} 1427 1428/// hasAnyValueDependentArguments - Determines if any of the expressions 1429/// in Exprs is value-dependent. 1430bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1431 for (unsigned I = 0; I < NumExprs; ++I) 1432 if (Exprs[I]->isValueDependent()) 1433 return true; 1434 1435 return false; 1436} 1437 1438bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1439 // This function is attempting whether an expression is an initializer 1440 // which can be evaluated at compile-time. isEvaluatable handles most 1441 // of the cases, but it can't deal with some initializer-specific 1442 // expressions, and it can't deal with aggregates; we deal with those here, 1443 // and fall back to isEvaluatable for the other cases. 1444 1445 // FIXME: This function assumes the variable being assigned to 1446 // isn't a reference type! 1447 1448 switch (getStmtClass()) { 1449 default: break; 1450 case StringLiteralClass: 1451 case ObjCStringLiteralClass: 1452 case ObjCEncodeExprClass: 1453 return true; 1454 case CompoundLiteralExprClass: { 1455 // This handles gcc's extension that allows global initializers like 1456 // "struct x {int x;} x = (struct x) {};". 1457 // FIXME: This accepts other cases it shouldn't! 1458 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1459 return Exp->isConstantInitializer(Ctx); 1460 } 1461 case InitListExprClass: { 1462 // FIXME: This doesn't deal with fields with reference types correctly. 1463 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1464 // to bitfields. 1465 const InitListExpr *Exp = cast<InitListExpr>(this); 1466 unsigned numInits = Exp->getNumInits(); 1467 for (unsigned i = 0; i < numInits; i++) { 1468 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1469 return false; 1470 } 1471 return true; 1472 } 1473 case ImplicitValueInitExprClass: 1474 return true; 1475 case ParenExprClass: 1476 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1477 case UnaryOperatorClass: { 1478 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1479 if (Exp->getOpcode() == UnaryOperator::Extension) 1480 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1481 break; 1482 } 1483 case BinaryOperatorClass: { 1484 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1485 // but this handles the common case. 1486 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1487 if (Exp->getOpcode() == BinaryOperator::Sub && 1488 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1489 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1490 return true; 1491 break; 1492 } 1493 case ImplicitCastExprClass: 1494 case CStyleCastExprClass: 1495 // Handle casts with a destination that's a struct or union; this 1496 // deals with both the gcc no-op struct cast extension and the 1497 // cast-to-union extension. 1498 if (getType()->isRecordType()) 1499 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1500 1501 // Integer->integer casts can be handled here, which is important for 1502 // things like (int)(&&x-&&y). Scary but true. 1503 if (getType()->isIntegerType() && 1504 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1505 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1506 1507 break; 1508 } 1509 return isEvaluatable(Ctx); 1510} 1511 1512/// isIntegerConstantExpr - this recursive routine will test if an expression is 1513/// an integer constant expression. 1514 1515/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1516/// comma, etc 1517/// 1518/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1519/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1520/// cast+dereference. 1521 1522// CheckICE - This function does the fundamental ICE checking: the returned 1523// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1524// Note that to reduce code duplication, this helper does no evaluation 1525// itself; the caller checks whether the expression is evaluatable, and 1526// in the rare cases where CheckICE actually cares about the evaluated 1527// value, it calls into Evalute. 1528// 1529// Meanings of Val: 1530// 0: This expression is an ICE if it can be evaluated by Evaluate. 1531// 1: This expression is not an ICE, but if it isn't evaluated, it's 1532// a legal subexpression for an ICE. This return value is used to handle 1533// the comma operator in C99 mode. 1534// 2: This expression is not an ICE, and is not a legal subexpression for one. 1535 1536struct ICEDiag { 1537 unsigned Val; 1538 SourceLocation Loc; 1539 1540 public: 1541 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1542 ICEDiag() : Val(0) {} 1543}; 1544 1545ICEDiag NoDiag() { return ICEDiag(); } 1546 1547static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1548 Expr::EvalResult EVResult; 1549 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1550 !EVResult.Val.isInt()) { 1551 return ICEDiag(2, E->getLocStart()); 1552 } 1553 return NoDiag(); 1554} 1555 1556static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1557 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1558 if (!E->getType()->isIntegralType()) { 1559 return ICEDiag(2, E->getLocStart()); 1560 } 1561 1562 switch (E->getStmtClass()) { 1563#define STMT(Node, Base) case Expr::Node##Class: 1564#define EXPR(Node, Base) 1565#include "clang/AST/StmtNodes.def" 1566 case Expr::PredefinedExprClass: 1567 case Expr::FloatingLiteralClass: 1568 case Expr::ImaginaryLiteralClass: 1569 case Expr::StringLiteralClass: 1570 case Expr::ArraySubscriptExprClass: 1571 case Expr::MemberExprClass: 1572 case Expr::CompoundAssignOperatorClass: 1573 case Expr::CompoundLiteralExprClass: 1574 case Expr::ExtVectorElementExprClass: 1575 case Expr::InitListExprClass: 1576 case Expr::DesignatedInitExprClass: 1577 case Expr::ImplicitValueInitExprClass: 1578 case Expr::ParenListExprClass: 1579 case Expr::VAArgExprClass: 1580 case Expr::AddrLabelExprClass: 1581 case Expr::StmtExprClass: 1582 case Expr::CXXMemberCallExprClass: 1583 case Expr::CXXDynamicCastExprClass: 1584 case Expr::CXXTypeidExprClass: 1585 case Expr::CXXNullPtrLiteralExprClass: 1586 case Expr::CXXThisExprClass: 1587 case Expr::CXXThrowExprClass: 1588 case Expr::CXXNewExprClass: 1589 case Expr::CXXDeleteExprClass: 1590 case Expr::CXXPseudoDestructorExprClass: 1591 case Expr::UnresolvedLookupExprClass: 1592 case Expr::DependentScopeDeclRefExprClass: 1593 case Expr::CXXConstructExprClass: 1594 case Expr::CXXBindTemporaryExprClass: 1595 case Expr::CXXExprWithTemporariesClass: 1596 case Expr::CXXTemporaryObjectExprClass: 1597 case Expr::CXXUnresolvedConstructExprClass: 1598 case Expr::CXXDependentScopeMemberExprClass: 1599 case Expr::UnresolvedMemberExprClass: 1600 case Expr::ObjCStringLiteralClass: 1601 case Expr::ObjCEncodeExprClass: 1602 case Expr::ObjCMessageExprClass: 1603 case Expr::ObjCSelectorExprClass: 1604 case Expr::ObjCProtocolExprClass: 1605 case Expr::ObjCIvarRefExprClass: 1606 case Expr::ObjCPropertyRefExprClass: 1607 case Expr::ObjCImplicitSetterGetterRefExprClass: 1608 case Expr::ObjCSuperExprClass: 1609 case Expr::ObjCIsaExprClass: 1610 case Expr::ShuffleVectorExprClass: 1611 case Expr::BlockExprClass: 1612 case Expr::BlockDeclRefExprClass: 1613 case Expr::NoStmtClass: 1614 case Expr::ExprClass: 1615 return ICEDiag(2, E->getLocStart()); 1616 1617 case Expr::GNUNullExprClass: 1618 // GCC considers the GNU __null value to be an integral constant expression. 1619 return NoDiag(); 1620 1621 case Expr::ParenExprClass: 1622 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1623 case Expr::IntegerLiteralClass: 1624 case Expr::CharacterLiteralClass: 1625 case Expr::CXXBoolLiteralExprClass: 1626 case Expr::CXXZeroInitValueExprClass: 1627 case Expr::TypesCompatibleExprClass: 1628 case Expr::UnaryTypeTraitExprClass: 1629 return NoDiag(); 1630 case Expr::CallExprClass: 1631 case Expr::CXXOperatorCallExprClass: { 1632 const CallExpr *CE = cast<CallExpr>(E); 1633 if (CE->isBuiltinCall(Ctx)) 1634 return CheckEvalInICE(E, Ctx); 1635 return ICEDiag(2, E->getLocStart()); 1636 } 1637 case Expr::DeclRefExprClass: 1638 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1639 return NoDiag(); 1640 if (Ctx.getLangOptions().CPlusPlus && 1641 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1642 // C++ 7.1.5.1p2 1643 // A variable of non-volatile const-qualified integral or enumeration 1644 // type initialized by an ICE can be used in ICEs. 1645 if (const VarDecl *Dcl = 1646 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1647 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1648 if (Quals.hasVolatile() || !Quals.hasConst()) 1649 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1650 1651 // Look for the definition of this variable, which will actually have 1652 // an initializer. 1653 const VarDecl *Def = 0; 1654 const Expr *Init = Dcl->getDefinition(Def); 1655 if (Init) { 1656 if (Def->isInitKnownICE()) { 1657 // We have already checked whether this subexpression is an 1658 // integral constant expression. 1659 if (Def->isInitICE()) 1660 return NoDiag(); 1661 else 1662 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1663 } 1664 1665 // C++ [class.static.data]p4: 1666 // If a static data member is of const integral or const 1667 // enumeration type, its declaration in the class definition can 1668 // specify a constant-initializer which shall be an integral 1669 // constant expression (5.19). In that case, the member can appear 1670 // in integral constant expressions. 1671 if (Def->isOutOfLine()) { 1672 Dcl->setInitKnownICE(false); 1673 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1674 } 1675 1676 if (Dcl->isCheckingICE()) { 1677 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1678 } 1679 1680 Dcl->setCheckingICE(); 1681 ICEDiag Result = CheckICE(Init, Ctx); 1682 // Cache the result of the ICE test. 1683 Dcl->setInitKnownICE(Result.Val == 0); 1684 return Result; 1685 } 1686 } 1687 } 1688 return ICEDiag(2, E->getLocStart()); 1689 case Expr::UnaryOperatorClass: { 1690 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1691 switch (Exp->getOpcode()) { 1692 case UnaryOperator::PostInc: 1693 case UnaryOperator::PostDec: 1694 case UnaryOperator::PreInc: 1695 case UnaryOperator::PreDec: 1696 case UnaryOperator::AddrOf: 1697 case UnaryOperator::Deref: 1698 return ICEDiag(2, E->getLocStart()); 1699 1700 case UnaryOperator::Extension: 1701 case UnaryOperator::LNot: 1702 case UnaryOperator::Plus: 1703 case UnaryOperator::Minus: 1704 case UnaryOperator::Not: 1705 case UnaryOperator::Real: 1706 case UnaryOperator::Imag: 1707 return CheckICE(Exp->getSubExpr(), Ctx); 1708 case UnaryOperator::OffsetOf: 1709 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1710 // Evaluate matches the proposed gcc behavior for cases like 1711 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1712 // compliance: we should warn earlier for offsetof expressions with 1713 // array subscripts that aren't ICEs, and if the array subscripts 1714 // are ICEs, the value of the offsetof must be an integer constant. 1715 return CheckEvalInICE(E, Ctx); 1716 } 1717 } 1718 case Expr::SizeOfAlignOfExprClass: { 1719 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1720 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1721 return ICEDiag(2, E->getLocStart()); 1722 return NoDiag(); 1723 } 1724 case Expr::BinaryOperatorClass: { 1725 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1726 switch (Exp->getOpcode()) { 1727 case BinaryOperator::PtrMemD: 1728 case BinaryOperator::PtrMemI: 1729 case BinaryOperator::Assign: 1730 case BinaryOperator::MulAssign: 1731 case BinaryOperator::DivAssign: 1732 case BinaryOperator::RemAssign: 1733 case BinaryOperator::AddAssign: 1734 case BinaryOperator::SubAssign: 1735 case BinaryOperator::ShlAssign: 1736 case BinaryOperator::ShrAssign: 1737 case BinaryOperator::AndAssign: 1738 case BinaryOperator::XorAssign: 1739 case BinaryOperator::OrAssign: 1740 return ICEDiag(2, E->getLocStart()); 1741 1742 case BinaryOperator::Mul: 1743 case BinaryOperator::Div: 1744 case BinaryOperator::Rem: 1745 case BinaryOperator::Add: 1746 case BinaryOperator::Sub: 1747 case BinaryOperator::Shl: 1748 case BinaryOperator::Shr: 1749 case BinaryOperator::LT: 1750 case BinaryOperator::GT: 1751 case BinaryOperator::LE: 1752 case BinaryOperator::GE: 1753 case BinaryOperator::EQ: 1754 case BinaryOperator::NE: 1755 case BinaryOperator::And: 1756 case BinaryOperator::Xor: 1757 case BinaryOperator::Or: 1758 case BinaryOperator::Comma: { 1759 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1760 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1761 if (Exp->getOpcode() == BinaryOperator::Div || 1762 Exp->getOpcode() == BinaryOperator::Rem) { 1763 // Evaluate gives an error for undefined Div/Rem, so make sure 1764 // we don't evaluate one. 1765 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1766 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1767 if (REval == 0) 1768 return ICEDiag(1, E->getLocStart()); 1769 if (REval.isSigned() && REval.isAllOnesValue()) { 1770 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1771 if (LEval.isMinSignedValue()) 1772 return ICEDiag(1, E->getLocStart()); 1773 } 1774 } 1775 } 1776 if (Exp->getOpcode() == BinaryOperator::Comma) { 1777 if (Ctx.getLangOptions().C99) { 1778 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1779 // if it isn't evaluated. 1780 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1781 return ICEDiag(1, E->getLocStart()); 1782 } else { 1783 // In both C89 and C++, commas in ICEs are illegal. 1784 return ICEDiag(2, E->getLocStart()); 1785 } 1786 } 1787 if (LHSResult.Val >= RHSResult.Val) 1788 return LHSResult; 1789 return RHSResult; 1790 } 1791 case BinaryOperator::LAnd: 1792 case BinaryOperator::LOr: { 1793 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1794 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1795 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1796 // Rare case where the RHS has a comma "side-effect"; we need 1797 // to actually check the condition to see whether the side 1798 // with the comma is evaluated. 1799 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1800 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1801 return RHSResult; 1802 return NoDiag(); 1803 } 1804 1805 if (LHSResult.Val >= RHSResult.Val) 1806 return LHSResult; 1807 return RHSResult; 1808 } 1809 } 1810 } 1811 case Expr::CastExprClass: 1812 case Expr::ImplicitCastExprClass: 1813 case Expr::ExplicitCastExprClass: 1814 case Expr::CStyleCastExprClass: 1815 case Expr::CXXFunctionalCastExprClass: 1816 case Expr::CXXNamedCastExprClass: 1817 case Expr::CXXStaticCastExprClass: 1818 case Expr::CXXReinterpretCastExprClass: 1819 case Expr::CXXConstCastExprClass: { 1820 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1821 if (SubExpr->getType()->isIntegralType()) 1822 return CheckICE(SubExpr, Ctx); 1823 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1824 return NoDiag(); 1825 return ICEDiag(2, E->getLocStart()); 1826 } 1827 case Expr::ConditionalOperatorClass: { 1828 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1829 // If the condition (ignoring parens) is a __builtin_constant_p call, 1830 // then only the true side is actually considered in an integer constant 1831 // expression, and it is fully evaluated. This is an important GNU 1832 // extension. See GCC PR38377 for discussion. 1833 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1834 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1835 Expr::EvalResult EVResult; 1836 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1837 !EVResult.Val.isInt()) { 1838 return ICEDiag(2, E->getLocStart()); 1839 } 1840 return NoDiag(); 1841 } 1842 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1843 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1844 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1845 if (CondResult.Val == 2) 1846 return CondResult; 1847 if (TrueResult.Val == 2) 1848 return TrueResult; 1849 if (FalseResult.Val == 2) 1850 return FalseResult; 1851 if (CondResult.Val == 1) 1852 return CondResult; 1853 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1854 return NoDiag(); 1855 // Rare case where the diagnostics depend on which side is evaluated 1856 // Note that if we get here, CondResult is 0, and at least one of 1857 // TrueResult and FalseResult is non-zero. 1858 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1859 return FalseResult; 1860 } 1861 return TrueResult; 1862 } 1863 case Expr::CXXDefaultArgExprClass: 1864 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1865 case Expr::ChooseExprClass: { 1866 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1867 } 1868 } 1869 1870 // Silence a GCC warning 1871 return ICEDiag(2, E->getLocStart()); 1872} 1873 1874bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1875 SourceLocation *Loc, bool isEvaluated) const { 1876 ICEDiag d = CheckICE(this, Ctx); 1877 if (d.Val != 0) { 1878 if (Loc) *Loc = d.Loc; 1879 return false; 1880 } 1881 EvalResult EvalResult; 1882 if (!Evaluate(EvalResult, Ctx)) 1883 llvm_unreachable("ICE cannot be evaluated!"); 1884 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1885 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1886 Result = EvalResult.Val.getInt(); 1887 return true; 1888} 1889 1890/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1891/// integer constant expression with the value zero, or if this is one that is 1892/// cast to void*. 1893bool Expr::isNullPointerConstant(ASTContext &Ctx, 1894 NullPointerConstantValueDependence NPC) const { 1895 if (isValueDependent()) { 1896 switch (NPC) { 1897 case NPC_NeverValueDependent: 1898 assert(false && "Unexpected value dependent expression!"); 1899 // If the unthinkable happens, fall through to the safest alternative. 1900 1901 case NPC_ValueDependentIsNull: 1902 return isTypeDependent() || getType()->isIntegralType(); 1903 1904 case NPC_ValueDependentIsNotNull: 1905 return false; 1906 } 1907 } 1908 1909 // Strip off a cast to void*, if it exists. Except in C++. 1910 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1911 if (!Ctx.getLangOptions().CPlusPlus) { 1912 // Check that it is a cast to void*. 1913 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1914 QualType Pointee = PT->getPointeeType(); 1915 if (!Pointee.hasQualifiers() && 1916 Pointee->isVoidType() && // to void* 1917 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1918 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1919 } 1920 } 1921 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1922 // Ignore the ImplicitCastExpr type entirely. 1923 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1924 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1925 // Accept ((void*)0) as a null pointer constant, as many other 1926 // implementations do. 1927 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1928 } else if (const CXXDefaultArgExpr *DefaultArg 1929 = dyn_cast<CXXDefaultArgExpr>(this)) { 1930 // See through default argument expressions 1931 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1932 } else if (isa<GNUNullExpr>(this)) { 1933 // The GNU __null extension is always a null pointer constant. 1934 return true; 1935 } 1936 1937 // C++0x nullptr_t is always a null pointer constant. 1938 if (getType()->isNullPtrType()) 1939 return true; 1940 1941 // This expression must be an integer type. 1942 if (!getType()->isIntegerType() || 1943 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1944 return false; 1945 1946 // If we have an integer constant expression, we need to *evaluate* it and 1947 // test for the value 0. 1948 llvm::APSInt Result; 1949 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1950} 1951 1952FieldDecl *Expr::getBitField() { 1953 Expr *E = this->IgnoreParens(); 1954 1955 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1956 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1957 if (Field->isBitField()) 1958 return Field; 1959 1960 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1961 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1962 return BinOp->getLHS()->getBitField(); 1963 1964 return 0; 1965} 1966 1967/// isArrow - Return true if the base expression is a pointer to vector, 1968/// return false if the base expression is a vector. 1969bool ExtVectorElementExpr::isArrow() const { 1970 return getBase()->getType()->isPointerType(); 1971} 1972 1973unsigned ExtVectorElementExpr::getNumElements() const { 1974 if (const VectorType *VT = getType()->getAs<VectorType>()) 1975 return VT->getNumElements(); 1976 return 1; 1977} 1978 1979/// containsDuplicateElements - Return true if any element access is repeated. 1980bool ExtVectorElementExpr::containsDuplicateElements() const { 1981 // FIXME: Refactor this code to an accessor on the AST node which returns the 1982 // "type" of component access, and share with code below and in Sema. 1983 llvm::StringRef Comp = Accessor->getName(); 1984 1985 // Halving swizzles do not contain duplicate elements. 1986 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1987 return false; 1988 1989 // Advance past s-char prefix on hex swizzles. 1990 if (Comp[0] == 's' || Comp[0] == 'S') 1991 Comp = Comp.substr(1); 1992 1993 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1994 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1995 return true; 1996 1997 return false; 1998} 1999 2000/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2001void ExtVectorElementExpr::getEncodedElementAccess( 2002 llvm::SmallVectorImpl<unsigned> &Elts) const { 2003 llvm::StringRef Comp = Accessor->getName(); 2004 if (Comp[0] == 's' || Comp[0] == 'S') 2005 Comp = Comp.substr(1); 2006 2007 bool isHi = Comp == "hi"; 2008 bool isLo = Comp == "lo"; 2009 bool isEven = Comp == "even"; 2010 bool isOdd = Comp == "odd"; 2011 2012 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2013 uint64_t Index; 2014 2015 if (isHi) 2016 Index = e + i; 2017 else if (isLo) 2018 Index = i; 2019 else if (isEven) 2020 Index = 2 * i; 2021 else if (isOdd) 2022 Index = 2 * i + 1; 2023 else 2024 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2025 2026 Elts.push_back(Index); 2027 } 2028} 2029 2030// constructor for instance messages. 2031ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 2032 QualType retType, ObjCMethodDecl *mproto, 2033 SourceLocation LBrac, SourceLocation RBrac, 2034 Expr **ArgExprs, unsigned nargs) 2035 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2036 MethodProto(mproto) { 2037 NumArgs = nargs; 2038 SubExprs = new Stmt*[NumArgs+1]; 2039 SubExprs[RECEIVER] = receiver; 2040 if (NumArgs) { 2041 for (unsigned i = 0; i != NumArgs; ++i) 2042 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2043 } 2044 LBracloc = LBrac; 2045 RBracloc = RBrac; 2046} 2047 2048// constructor for class messages. 2049// FIXME: clsName should be typed to ObjCInterfaceType 2050ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 2051 QualType retType, ObjCMethodDecl *mproto, 2052 SourceLocation LBrac, SourceLocation RBrac, 2053 Expr **ArgExprs, unsigned nargs) 2054 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2055 MethodProto(mproto) { 2056 NumArgs = nargs; 2057 SubExprs = new Stmt*[NumArgs+1]; 2058 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2059 if (NumArgs) { 2060 for (unsigned i = 0; i != NumArgs; ++i) 2061 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2062 } 2063 LBracloc = LBrac; 2064 RBracloc = RBrac; 2065} 2066 2067// constructor for class messages. 2068ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2069 QualType retType, ObjCMethodDecl *mproto, 2070 SourceLocation LBrac, SourceLocation RBrac, 2071 Expr **ArgExprs, unsigned nargs) 2072: Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo), 2073MethodProto(mproto) { 2074 NumArgs = nargs; 2075 SubExprs = new Stmt*[NumArgs+1]; 2076 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2077 if (NumArgs) { 2078 for (unsigned i = 0; i != NumArgs; ++i) 2079 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2080 } 2081 LBracloc = LBrac; 2082 RBracloc = RBrac; 2083} 2084 2085ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2086 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2087 switch (x & Flags) { 2088 default: 2089 assert(false && "Invalid ObjCMessageExpr."); 2090 case IsInstMeth: 2091 return ClassInfo(0, 0); 2092 case IsClsMethDeclUnknown: 2093 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2094 case IsClsMethDeclKnown: { 2095 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2096 return ClassInfo(D, D->getIdentifier()); 2097 } 2098 } 2099} 2100 2101void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2102 if (CI.first == 0 && CI.second == 0) 2103 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2104 else if (CI.first == 0) 2105 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2106 else 2107 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2108} 2109 2110 2111bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2112 return getCond()->EvaluateAsInt(C) != 0; 2113} 2114 2115void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2116 unsigned NumExprs) { 2117 if (SubExprs) C.Deallocate(SubExprs); 2118 2119 SubExprs = new (C) Stmt* [NumExprs]; 2120 this->NumExprs = NumExprs; 2121 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2122} 2123 2124void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2125 DestroyChildren(C); 2126 if (SubExprs) C.Deallocate(SubExprs); 2127 this->~ShuffleVectorExpr(); 2128 C.Deallocate(this); 2129} 2130 2131void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2132 // Override default behavior of traversing children. If this has a type 2133 // operand and the type is a variable-length array, the child iteration 2134 // will iterate over the size expression. However, this expression belongs 2135 // to the type, not to this, so we don't want to delete it. 2136 // We still want to delete this expression. 2137 if (isArgumentType()) { 2138 this->~SizeOfAlignOfExpr(); 2139 C.Deallocate(this); 2140 } 2141 else 2142 Expr::DoDestroy(C); 2143} 2144 2145//===----------------------------------------------------------------------===// 2146// DesignatedInitExpr 2147//===----------------------------------------------------------------------===// 2148 2149IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2150 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2151 if (Field.NameOrField & 0x01) 2152 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2153 else 2154 return getField()->getIdentifier(); 2155} 2156 2157DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2158 const Designator *Designators, 2159 SourceLocation EqualOrColonLoc, 2160 bool GNUSyntax, 2161 Expr **IndexExprs, 2162 unsigned NumIndexExprs, 2163 Expr *Init) 2164 : Expr(DesignatedInitExprClass, Ty, 2165 Init->isTypeDependent(), Init->isValueDependent()), 2166 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2167 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2168 this->Designators = new Designator[NumDesignators]; 2169 2170 // Record the initializer itself. 2171 child_iterator Child = child_begin(); 2172 *Child++ = Init; 2173 2174 // Copy the designators and their subexpressions, computing 2175 // value-dependence along the way. 2176 unsigned IndexIdx = 0; 2177 for (unsigned I = 0; I != NumDesignators; ++I) { 2178 this->Designators[I] = Designators[I]; 2179 2180 if (this->Designators[I].isArrayDesignator()) { 2181 // Compute type- and value-dependence. 2182 Expr *Index = IndexExprs[IndexIdx]; 2183 ValueDependent = ValueDependent || 2184 Index->isTypeDependent() || Index->isValueDependent(); 2185 2186 // Copy the index expressions into permanent storage. 2187 *Child++ = IndexExprs[IndexIdx++]; 2188 } else if (this->Designators[I].isArrayRangeDesignator()) { 2189 // Compute type- and value-dependence. 2190 Expr *Start = IndexExprs[IndexIdx]; 2191 Expr *End = IndexExprs[IndexIdx + 1]; 2192 ValueDependent = ValueDependent || 2193 Start->isTypeDependent() || Start->isValueDependent() || 2194 End->isTypeDependent() || End->isValueDependent(); 2195 2196 // Copy the start/end expressions into permanent storage. 2197 *Child++ = IndexExprs[IndexIdx++]; 2198 *Child++ = IndexExprs[IndexIdx++]; 2199 } 2200 } 2201 2202 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2203} 2204 2205DesignatedInitExpr * 2206DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2207 unsigned NumDesignators, 2208 Expr **IndexExprs, unsigned NumIndexExprs, 2209 SourceLocation ColonOrEqualLoc, 2210 bool UsesColonSyntax, Expr *Init) { 2211 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2212 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2213 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2214 ColonOrEqualLoc, UsesColonSyntax, 2215 IndexExprs, NumIndexExprs, Init); 2216} 2217 2218DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2219 unsigned NumIndexExprs) { 2220 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2221 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2222 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2223} 2224 2225void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2226 unsigned NumDesigs) { 2227 if (Designators) 2228 delete [] Designators; 2229 2230 Designators = new Designator[NumDesigs]; 2231 NumDesignators = NumDesigs; 2232 for (unsigned I = 0; I != NumDesigs; ++I) 2233 Designators[I] = Desigs[I]; 2234} 2235 2236SourceRange DesignatedInitExpr::getSourceRange() const { 2237 SourceLocation StartLoc; 2238 Designator &First = 2239 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2240 if (First.isFieldDesignator()) { 2241 if (GNUSyntax) 2242 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2243 else 2244 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2245 } else 2246 StartLoc = 2247 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2248 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2249} 2250 2251Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2252 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2253 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2254 Ptr += sizeof(DesignatedInitExpr); 2255 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2256 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2257} 2258 2259Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2260 assert(D.Kind == Designator::ArrayRangeDesignator && 2261 "Requires array range designator"); 2262 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2263 Ptr += sizeof(DesignatedInitExpr); 2264 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2265 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2266} 2267 2268Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2269 assert(D.Kind == Designator::ArrayRangeDesignator && 2270 "Requires array range designator"); 2271 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2272 Ptr += sizeof(DesignatedInitExpr); 2273 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2274 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2275} 2276 2277/// \brief Replaces the designator at index @p Idx with the series 2278/// of designators in [First, Last). 2279void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2280 const Designator *First, 2281 const Designator *Last) { 2282 unsigned NumNewDesignators = Last - First; 2283 if (NumNewDesignators == 0) { 2284 std::copy_backward(Designators + Idx + 1, 2285 Designators + NumDesignators, 2286 Designators + Idx); 2287 --NumNewDesignators; 2288 return; 2289 } else if (NumNewDesignators == 1) { 2290 Designators[Idx] = *First; 2291 return; 2292 } 2293 2294 Designator *NewDesignators 2295 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2296 std::copy(Designators, Designators + Idx, NewDesignators); 2297 std::copy(First, Last, NewDesignators + Idx); 2298 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2299 NewDesignators + Idx + NumNewDesignators); 2300 delete [] Designators; 2301 Designators = NewDesignators; 2302 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2303} 2304 2305void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2306 delete [] Designators; 2307 Expr::DoDestroy(C); 2308} 2309 2310ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2311 Expr **exprs, unsigned nexprs, 2312 SourceLocation rparenloc) 2313: Expr(ParenListExprClass, QualType(), 2314 hasAnyTypeDependentArguments(exprs, nexprs), 2315 hasAnyValueDependentArguments(exprs, nexprs)), 2316 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2317 2318 Exprs = new (C) Stmt*[nexprs]; 2319 for (unsigned i = 0; i != nexprs; ++i) 2320 Exprs[i] = exprs[i]; 2321} 2322 2323void ParenListExpr::DoDestroy(ASTContext& C) { 2324 DestroyChildren(C); 2325 if (Exprs) C.Deallocate(Exprs); 2326 this->~ParenListExpr(); 2327 C.Deallocate(this); 2328} 2329 2330//===----------------------------------------------------------------------===// 2331// ExprIterator. 2332//===----------------------------------------------------------------------===// 2333 2334Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2335Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2336Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2337const Expr* ConstExprIterator::operator[](size_t idx) const { 2338 return cast<Expr>(I[idx]); 2339} 2340const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2341const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2342 2343//===----------------------------------------------------------------------===// 2344// Child Iterators for iterating over subexpressions/substatements 2345//===----------------------------------------------------------------------===// 2346 2347// DeclRefExpr 2348Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2349Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2350 2351// ObjCIvarRefExpr 2352Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2353Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2354 2355// ObjCPropertyRefExpr 2356Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2357Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2358 2359// ObjCImplicitSetterGetterRefExpr 2360Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2361 return &Base; 2362} 2363Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2364 return &Base+1; 2365} 2366 2367// ObjCSuperExpr 2368Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2369Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2370 2371// ObjCIsaExpr 2372Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2373Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2374 2375// PredefinedExpr 2376Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2377Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2378 2379// IntegerLiteral 2380Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2381Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2382 2383// CharacterLiteral 2384Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2385Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2386 2387// FloatingLiteral 2388Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2389Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2390 2391// ImaginaryLiteral 2392Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2393Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2394 2395// StringLiteral 2396Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2397Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2398 2399// ParenExpr 2400Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2401Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2402 2403// UnaryOperator 2404Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2405Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2406 2407// SizeOfAlignOfExpr 2408Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2409 // If this is of a type and the type is a VLA type (and not a typedef), the 2410 // size expression of the VLA needs to be treated as an executable expression. 2411 // Why isn't this weirdness documented better in StmtIterator? 2412 if (isArgumentType()) { 2413 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2414 getArgumentType().getTypePtr())) 2415 return child_iterator(T); 2416 return child_iterator(); 2417 } 2418 return child_iterator(&Argument.Ex); 2419} 2420Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2421 if (isArgumentType()) 2422 return child_iterator(); 2423 return child_iterator(&Argument.Ex + 1); 2424} 2425 2426// ArraySubscriptExpr 2427Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2428 return &SubExprs[0]; 2429} 2430Stmt::child_iterator ArraySubscriptExpr::child_end() { 2431 return &SubExprs[0]+END_EXPR; 2432} 2433 2434// CallExpr 2435Stmt::child_iterator CallExpr::child_begin() { 2436 return &SubExprs[0]; 2437} 2438Stmt::child_iterator CallExpr::child_end() { 2439 return &SubExprs[0]+NumArgs+ARGS_START; 2440} 2441 2442// MemberExpr 2443Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2444Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2445 2446// ExtVectorElementExpr 2447Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2448Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2449 2450// CompoundLiteralExpr 2451Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2452Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2453 2454// CastExpr 2455Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2456Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2457 2458// BinaryOperator 2459Stmt::child_iterator BinaryOperator::child_begin() { 2460 return &SubExprs[0]; 2461} 2462Stmt::child_iterator BinaryOperator::child_end() { 2463 return &SubExprs[0]+END_EXPR; 2464} 2465 2466// ConditionalOperator 2467Stmt::child_iterator ConditionalOperator::child_begin() { 2468 return &SubExprs[0]; 2469} 2470Stmt::child_iterator ConditionalOperator::child_end() { 2471 return &SubExprs[0]+END_EXPR; 2472} 2473 2474// AddrLabelExpr 2475Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2476Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2477 2478// StmtExpr 2479Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2480Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2481 2482// TypesCompatibleExpr 2483Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2484 return child_iterator(); 2485} 2486 2487Stmt::child_iterator TypesCompatibleExpr::child_end() { 2488 return child_iterator(); 2489} 2490 2491// ChooseExpr 2492Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2493Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2494 2495// GNUNullExpr 2496Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2497Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2498 2499// ShuffleVectorExpr 2500Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2501 return &SubExprs[0]; 2502} 2503Stmt::child_iterator ShuffleVectorExpr::child_end() { 2504 return &SubExprs[0]+NumExprs; 2505} 2506 2507// VAArgExpr 2508Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2509Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2510 2511// InitListExpr 2512Stmt::child_iterator InitListExpr::child_begin() { 2513 return InitExprs.size() ? &InitExprs[0] : 0; 2514} 2515Stmt::child_iterator InitListExpr::child_end() { 2516 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2517} 2518 2519// DesignatedInitExpr 2520Stmt::child_iterator DesignatedInitExpr::child_begin() { 2521 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2522 Ptr += sizeof(DesignatedInitExpr); 2523 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2524} 2525Stmt::child_iterator DesignatedInitExpr::child_end() { 2526 return child_iterator(&*child_begin() + NumSubExprs); 2527} 2528 2529// ImplicitValueInitExpr 2530Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2531 return child_iterator(); 2532} 2533 2534Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2535 return child_iterator(); 2536} 2537 2538// ParenListExpr 2539Stmt::child_iterator ParenListExpr::child_begin() { 2540 return &Exprs[0]; 2541} 2542Stmt::child_iterator ParenListExpr::child_end() { 2543 return &Exprs[0]+NumExprs; 2544} 2545 2546// ObjCStringLiteral 2547Stmt::child_iterator ObjCStringLiteral::child_begin() { 2548 return &String; 2549} 2550Stmt::child_iterator ObjCStringLiteral::child_end() { 2551 return &String+1; 2552} 2553 2554// ObjCEncodeExpr 2555Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2556Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2557 2558// ObjCSelectorExpr 2559Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2560 return child_iterator(); 2561} 2562Stmt::child_iterator ObjCSelectorExpr::child_end() { 2563 return child_iterator(); 2564} 2565 2566// ObjCProtocolExpr 2567Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2568 return child_iterator(); 2569} 2570Stmt::child_iterator ObjCProtocolExpr::child_end() { 2571 return child_iterator(); 2572} 2573 2574// ObjCMessageExpr 2575Stmt::child_iterator ObjCMessageExpr::child_begin() { 2576 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2577} 2578Stmt::child_iterator ObjCMessageExpr::child_end() { 2579 return &SubExprs[0]+ARGS_START+getNumArgs(); 2580} 2581 2582// Blocks 2583Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2584Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2585 2586Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2587Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2588