Expr.cpp revision d20254f2875d0004c57ee766f258dbcee29f4841
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 } 178 179 PrintingPolicy Policy(Context.getLangOptions()); 180 Policy.SuppressTagKind = true; 181 182 std::string Proto = FD->getQualifiedNameAsString(Policy); 183 184 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 185 const FunctionProtoType *FT = 0; 186 if (FD->hasWrittenPrototype()) 187 FT = dyn_cast<FunctionProtoType>(AFT); 188 189 Proto += "("; 190 if (FT) { 191 llvm::raw_string_ostream POut(Proto); 192 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 193 if (i) POut << ", "; 194 std::string Param; 195 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 196 POut << Param; 197 } 198 199 if (FT->isVariadic()) { 200 if (FD->getNumParams()) POut << ", "; 201 POut << "..."; 202 } 203 } 204 Proto += ")"; 205 206 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 207 AFT->getResultType().getAsStringInternal(Proto, Policy); 208 209 Out << Proto; 210 211 Out.flush(); 212 return Name.str().str(); 213 } 214 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 215 llvm::SmallString<256> Name; 216 llvm::raw_svector_ostream Out(Name); 217 Out << (MD->isInstanceMethod() ? '-' : '+'); 218 Out << '['; 219 Out << MD->getClassInterface()->getNameAsString(); 220 if (const ObjCCategoryImplDecl *CID = 221 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 222 Out << '('; 223 Out << CID->getNameAsString(); 224 Out << ')'; 225 } 226 Out << ' '; 227 Out << MD->getSelector().getAsString(); 228 Out << ']'; 229 230 Out.flush(); 231 return Name.str().str(); 232 } 233 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 234 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 235 return "top level"; 236 } 237 return ""; 238} 239 240/// getValueAsApproximateDouble - This returns the value as an inaccurate 241/// double. Note that this may cause loss of precision, but is useful for 242/// debugging dumps, etc. 243double FloatingLiteral::getValueAsApproximateDouble() const { 244 llvm::APFloat V = getValue(); 245 bool ignored; 246 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 247 &ignored); 248 return V.convertToDouble(); 249} 250 251StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 252 unsigned ByteLength, bool Wide, 253 QualType Ty, 254 const SourceLocation *Loc, 255 unsigned NumStrs) { 256 // Allocate enough space for the StringLiteral plus an array of locations for 257 // any concatenated string tokens. 258 void *Mem = C.Allocate(sizeof(StringLiteral)+ 259 sizeof(SourceLocation)*(NumStrs-1), 260 llvm::alignof<StringLiteral>()); 261 StringLiteral *SL = new (Mem) StringLiteral(Ty); 262 263 // OPTIMIZE: could allocate this appended to the StringLiteral. 264 char *AStrData = new (C, 1) char[ByteLength]; 265 memcpy(AStrData, StrData, ByteLength); 266 SL->StrData = AStrData; 267 SL->ByteLength = ByteLength; 268 SL->IsWide = Wide; 269 SL->TokLocs[0] = Loc[0]; 270 SL->NumConcatenated = NumStrs; 271 272 if (NumStrs != 1) 273 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 274 return SL; 275} 276 277StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 278 void *Mem = C.Allocate(sizeof(StringLiteral)+ 279 sizeof(SourceLocation)*(NumStrs-1), 280 llvm::alignof<StringLiteral>()); 281 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 282 SL->StrData = 0; 283 SL->ByteLength = 0; 284 SL->NumConcatenated = NumStrs; 285 return SL; 286} 287 288void StringLiteral::DoDestroy(ASTContext &C) { 289 C.Deallocate(const_cast<char*>(StrData)); 290 Expr::DoDestroy(C); 291} 292 293void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 294 if (StrData) 295 C.Deallocate(const_cast<char*>(StrData)); 296 297 char *AStrData = new (C, 1) char[Str.size()]; 298 memcpy(AStrData, Str.data(), Str.size()); 299 StrData = AStrData; 300 ByteLength = Str.size(); 301} 302 303/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 304/// corresponds to, e.g. "sizeof" or "[pre]++". 305const char *UnaryOperator::getOpcodeStr(Opcode Op) { 306 switch (Op) { 307 default: assert(0 && "Unknown unary operator"); 308 case PostInc: return "++"; 309 case PostDec: return "--"; 310 case PreInc: return "++"; 311 case PreDec: return "--"; 312 case AddrOf: return "&"; 313 case Deref: return "*"; 314 case Plus: return "+"; 315 case Minus: return "-"; 316 case Not: return "~"; 317 case LNot: return "!"; 318 case Real: return "__real"; 319 case Imag: return "__imag"; 320 case Extension: return "__extension__"; 321 case OffsetOf: return "__builtin_offsetof"; 322 } 323} 324 325UnaryOperator::Opcode 326UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 327 switch (OO) { 328 default: assert(false && "No unary operator for overloaded function"); 329 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 330 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 331 case OO_Amp: return AddrOf; 332 case OO_Star: return Deref; 333 case OO_Plus: return Plus; 334 case OO_Minus: return Minus; 335 case OO_Tilde: return Not; 336 case OO_Exclaim: return LNot; 337 } 338} 339 340OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 341 switch (Opc) { 342 case PostInc: case PreInc: return OO_PlusPlus; 343 case PostDec: case PreDec: return OO_MinusMinus; 344 case AddrOf: return OO_Amp; 345 case Deref: return OO_Star; 346 case Plus: return OO_Plus; 347 case Minus: return OO_Minus; 348 case Not: return OO_Tilde; 349 case LNot: return OO_Exclaim; 350 default: return OO_None; 351 } 352} 353 354 355//===----------------------------------------------------------------------===// 356// Postfix Operators. 357//===----------------------------------------------------------------------===// 358 359CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 360 unsigned numargs, QualType t, SourceLocation rparenloc) 361 : Expr(SC, t, 362 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 363 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 364 NumArgs(numargs) { 365 366 SubExprs = new (C) Stmt*[numargs+1]; 367 SubExprs[FN] = fn; 368 for (unsigned i = 0; i != numargs; ++i) 369 SubExprs[i+ARGS_START] = args[i]; 370 371 RParenLoc = rparenloc; 372} 373 374CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 375 QualType t, SourceLocation rparenloc) 376 : Expr(CallExprClass, t, 377 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 378 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 379 NumArgs(numargs) { 380 381 SubExprs = new (C) Stmt*[numargs+1]; 382 SubExprs[FN] = fn; 383 for (unsigned i = 0; i != numargs; ++i) 384 SubExprs[i+ARGS_START] = args[i]; 385 386 RParenLoc = rparenloc; 387} 388 389CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 390 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 391 SubExprs = new (C) Stmt*[1]; 392} 393 394void CallExpr::DoDestroy(ASTContext& C) { 395 DestroyChildren(C); 396 if (SubExprs) C.Deallocate(SubExprs); 397 this->~CallExpr(); 398 C.Deallocate(this); 399} 400 401Decl *CallExpr::getCalleeDecl() { 402 Expr *CEE = getCallee()->IgnoreParenCasts(); 403 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 404 return DRE->getDecl(); 405 406 return 0; 407} 408 409FunctionDecl *CallExpr::getDirectCallee() { 410 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 411} 412 413/// setNumArgs - This changes the number of arguments present in this call. 414/// Any orphaned expressions are deleted by this, and any new operands are set 415/// to null. 416void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 417 // No change, just return. 418 if (NumArgs == getNumArgs()) return; 419 420 // If shrinking # arguments, just delete the extras and forgot them. 421 if (NumArgs < getNumArgs()) { 422 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 423 getArg(i)->Destroy(C); 424 this->NumArgs = NumArgs; 425 return; 426 } 427 428 // Otherwise, we are growing the # arguments. New an bigger argument array. 429 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 430 // Copy over args. 431 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 432 NewSubExprs[i] = SubExprs[i]; 433 // Null out new args. 434 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 435 NewSubExprs[i] = 0; 436 437 if (SubExprs) C.Deallocate(SubExprs); 438 SubExprs = NewSubExprs; 439 this->NumArgs = NumArgs; 440} 441 442/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 443/// not, return 0. 444unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 445 // All simple function calls (e.g. func()) are implicitly cast to pointer to 446 // function. As a result, we try and obtain the DeclRefExpr from the 447 // ImplicitCastExpr. 448 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 449 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 450 return 0; 451 452 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 453 if (!DRE) 454 return 0; 455 456 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 457 if (!FDecl) 458 return 0; 459 460 if (!FDecl->getIdentifier()) 461 return 0; 462 463 return FDecl->getBuiltinID(); 464} 465 466QualType CallExpr::getCallReturnType() const { 467 QualType CalleeType = getCallee()->getType(); 468 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 469 CalleeType = FnTypePtr->getPointeeType(); 470 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 471 CalleeType = BPT->getPointeeType(); 472 473 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 474 return FnType->getResultType(); 475} 476 477MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 478 SourceRange qualrange, ValueDecl *memberdecl, 479 SourceLocation l, const TemplateArgumentListInfo *targs, 480 QualType ty) 481 : Expr(MemberExprClass, ty, 482 base->isTypeDependent() || (qual && qual->isDependent()), 483 base->isValueDependent() || (qual && qual->isDependent())), 484 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 485 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 486 // Initialize the qualifier, if any. 487 if (HasQualifier) { 488 NameQualifier *NQ = getMemberQualifier(); 489 NQ->NNS = qual; 490 NQ->Range = qualrange; 491 } 492 493 // Initialize the explicit template argument list, if any. 494 if (targs) 495 getExplicitTemplateArgumentList()->initializeFrom(*targs); 496} 497 498MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 499 NestedNameSpecifier *qual, 500 SourceRange qualrange, 501 ValueDecl *memberdecl, 502 SourceLocation l, 503 const TemplateArgumentListInfo *targs, 504 QualType ty) { 505 std::size_t Size = sizeof(MemberExpr); 506 if (qual != 0) 507 Size += sizeof(NameQualifier); 508 509 if (targs) 510 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 511 512 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 513 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 514 targs, ty); 515} 516 517const char *CastExpr::getCastKindName() const { 518 switch (getCastKind()) { 519 case CastExpr::CK_Unknown: 520 return "Unknown"; 521 case CastExpr::CK_BitCast: 522 return "BitCast"; 523 case CastExpr::CK_NoOp: 524 return "NoOp"; 525 case CastExpr::CK_BaseToDerived: 526 return "BaseToDerived"; 527 case CastExpr::CK_DerivedToBase: 528 return "DerivedToBase"; 529 case CastExpr::CK_Dynamic: 530 return "Dynamic"; 531 case CastExpr::CK_ToUnion: 532 return "ToUnion"; 533 case CastExpr::CK_ArrayToPointerDecay: 534 return "ArrayToPointerDecay"; 535 case CastExpr::CK_FunctionToPointerDecay: 536 return "FunctionToPointerDecay"; 537 case CastExpr::CK_NullToMemberPointer: 538 return "NullToMemberPointer"; 539 case CastExpr::CK_BaseToDerivedMemberPointer: 540 return "BaseToDerivedMemberPointer"; 541 case CastExpr::CK_DerivedToBaseMemberPointer: 542 return "DerivedToBaseMemberPointer"; 543 case CastExpr::CK_UserDefinedConversion: 544 return "UserDefinedConversion"; 545 case CastExpr::CK_ConstructorConversion: 546 return "ConstructorConversion"; 547 case CastExpr::CK_IntegralToPointer: 548 return "IntegralToPointer"; 549 case CastExpr::CK_PointerToIntegral: 550 return "PointerToIntegral"; 551 case CastExpr::CK_ToVoid: 552 return "ToVoid"; 553 case CastExpr::CK_VectorSplat: 554 return "VectorSplat"; 555 case CastExpr::CK_IntegralCast: 556 return "IntegralCast"; 557 case CastExpr::CK_IntegralToFloating: 558 return "IntegralToFloating"; 559 case CastExpr::CK_FloatingToIntegral: 560 return "FloatingToIntegral"; 561 case CastExpr::CK_FloatingCast: 562 return "FloatingCast"; 563 case CastExpr::CK_MemberPointerToBoolean: 564 return "MemberPointerToBoolean"; 565 case CastExpr::CK_AnyPointerToObjCPointerCast: 566 return "AnyPointerToObjCPointerCast"; 567 case CastExpr::CK_AnyPointerToBlockPointerCast: 568 return "AnyPointerToBlockPointerCast"; 569 } 570 571 assert(0 && "Unhandled cast kind!"); 572 return 0; 573} 574 575Expr *CastExpr::getSubExprAsWritten() { 576 Expr *SubExpr = 0; 577 CastExpr *E = this; 578 do { 579 SubExpr = E->getSubExpr(); 580 581 // Skip any temporary bindings; they're implicit. 582 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 583 SubExpr = Binder->getSubExpr(); 584 585 // Conversions by constructor and conversion functions have a 586 // subexpression describing the call; strip it off. 587 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 588 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 589 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 590 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 591 592 // If the subexpression we're left with is an implicit cast, look 593 // through that, too. 594 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 595 596 return SubExpr; 597} 598 599/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 600/// corresponds to, e.g. "<<=". 601const char *BinaryOperator::getOpcodeStr(Opcode Op) { 602 switch (Op) { 603 case PtrMemD: return ".*"; 604 case PtrMemI: return "->*"; 605 case Mul: return "*"; 606 case Div: return "/"; 607 case Rem: return "%"; 608 case Add: return "+"; 609 case Sub: return "-"; 610 case Shl: return "<<"; 611 case Shr: return ">>"; 612 case LT: return "<"; 613 case GT: return ">"; 614 case LE: return "<="; 615 case GE: return ">="; 616 case EQ: return "=="; 617 case NE: return "!="; 618 case And: return "&"; 619 case Xor: return "^"; 620 case Or: return "|"; 621 case LAnd: return "&&"; 622 case LOr: return "||"; 623 case Assign: return "="; 624 case MulAssign: return "*="; 625 case DivAssign: return "/="; 626 case RemAssign: return "%="; 627 case AddAssign: return "+="; 628 case SubAssign: return "-="; 629 case ShlAssign: return "<<="; 630 case ShrAssign: return ">>="; 631 case AndAssign: return "&="; 632 case XorAssign: return "^="; 633 case OrAssign: return "|="; 634 case Comma: return ","; 635 } 636 637 return ""; 638} 639 640BinaryOperator::Opcode 641BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 642 switch (OO) { 643 default: assert(false && "Not an overloadable binary operator"); 644 case OO_Plus: return Add; 645 case OO_Minus: return Sub; 646 case OO_Star: return Mul; 647 case OO_Slash: return Div; 648 case OO_Percent: return Rem; 649 case OO_Caret: return Xor; 650 case OO_Amp: return And; 651 case OO_Pipe: return Or; 652 case OO_Equal: return Assign; 653 case OO_Less: return LT; 654 case OO_Greater: return GT; 655 case OO_PlusEqual: return AddAssign; 656 case OO_MinusEqual: return SubAssign; 657 case OO_StarEqual: return MulAssign; 658 case OO_SlashEqual: return DivAssign; 659 case OO_PercentEqual: return RemAssign; 660 case OO_CaretEqual: return XorAssign; 661 case OO_AmpEqual: return AndAssign; 662 case OO_PipeEqual: return OrAssign; 663 case OO_LessLess: return Shl; 664 case OO_GreaterGreater: return Shr; 665 case OO_LessLessEqual: return ShlAssign; 666 case OO_GreaterGreaterEqual: return ShrAssign; 667 case OO_EqualEqual: return EQ; 668 case OO_ExclaimEqual: return NE; 669 case OO_LessEqual: return LE; 670 case OO_GreaterEqual: return GE; 671 case OO_AmpAmp: return LAnd; 672 case OO_PipePipe: return LOr; 673 case OO_Comma: return Comma; 674 case OO_ArrowStar: return PtrMemI; 675 } 676} 677 678OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 679 static const OverloadedOperatorKind OverOps[] = { 680 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 681 OO_Star, OO_Slash, OO_Percent, 682 OO_Plus, OO_Minus, 683 OO_LessLess, OO_GreaterGreater, 684 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 685 OO_EqualEqual, OO_ExclaimEqual, 686 OO_Amp, 687 OO_Caret, 688 OO_Pipe, 689 OO_AmpAmp, 690 OO_PipePipe, 691 OO_Equal, OO_StarEqual, 692 OO_SlashEqual, OO_PercentEqual, 693 OO_PlusEqual, OO_MinusEqual, 694 OO_LessLessEqual, OO_GreaterGreaterEqual, 695 OO_AmpEqual, OO_CaretEqual, 696 OO_PipeEqual, 697 OO_Comma 698 }; 699 return OverOps[Opc]; 700} 701 702InitListExpr::InitListExpr(SourceLocation lbraceloc, 703 Expr **initExprs, unsigned numInits, 704 SourceLocation rbraceloc) 705 : Expr(InitListExprClass, QualType(), false, false), 706 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 707 UnionFieldInit(0), HadArrayRangeDesignator(false) 708{ 709 for (unsigned I = 0; I != numInits; ++I) { 710 if (initExprs[I]->isTypeDependent()) 711 TypeDependent = true; 712 if (initExprs[I]->isValueDependent()) 713 ValueDependent = true; 714 } 715 716 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 717} 718 719void InitListExpr::reserveInits(unsigned NumInits) { 720 if (NumInits > InitExprs.size()) 721 InitExprs.reserve(NumInits); 722} 723 724void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 725 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 726 Idx < LastIdx; ++Idx) 727 InitExprs[Idx]->Destroy(Context); 728 InitExprs.resize(NumInits, 0); 729} 730 731Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 732 if (Init >= InitExprs.size()) { 733 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 734 InitExprs.back() = expr; 735 return 0; 736 } 737 738 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 739 InitExprs[Init] = expr; 740 return Result; 741} 742 743/// getFunctionType - Return the underlying function type for this block. 744/// 745const FunctionType *BlockExpr::getFunctionType() const { 746 return getType()->getAs<BlockPointerType>()-> 747 getPointeeType()->getAs<FunctionType>(); 748} 749 750SourceLocation BlockExpr::getCaretLocation() const { 751 return TheBlock->getCaretLocation(); 752} 753const Stmt *BlockExpr::getBody() const { 754 return TheBlock->getBody(); 755} 756Stmt *BlockExpr::getBody() { 757 return TheBlock->getBody(); 758} 759 760 761//===----------------------------------------------------------------------===// 762// Generic Expression Routines 763//===----------------------------------------------------------------------===// 764 765/// isUnusedResultAWarning - Return true if this immediate expression should 766/// be warned about if the result is unused. If so, fill in Loc and Ranges 767/// with location to warn on and the source range[s] to report with the 768/// warning. 769bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 770 SourceRange &R2, ASTContext &Ctx) const { 771 // Don't warn if the expr is type dependent. The type could end up 772 // instantiating to void. 773 if (isTypeDependent()) 774 return false; 775 776 switch (getStmtClass()) { 777 default: 778 Loc = getExprLoc(); 779 R1 = getSourceRange(); 780 return true; 781 case ParenExprClass: 782 return cast<ParenExpr>(this)->getSubExpr()-> 783 isUnusedResultAWarning(Loc, R1, R2, Ctx); 784 case UnaryOperatorClass: { 785 const UnaryOperator *UO = cast<UnaryOperator>(this); 786 787 switch (UO->getOpcode()) { 788 default: break; 789 case UnaryOperator::PostInc: 790 case UnaryOperator::PostDec: 791 case UnaryOperator::PreInc: 792 case UnaryOperator::PreDec: // ++/-- 793 return false; // Not a warning. 794 case UnaryOperator::Deref: 795 // Dereferencing a volatile pointer is a side-effect. 796 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 797 return false; 798 break; 799 case UnaryOperator::Real: 800 case UnaryOperator::Imag: 801 // accessing a piece of a volatile complex is a side-effect. 802 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 803 .isVolatileQualified()) 804 return false; 805 break; 806 case UnaryOperator::Extension: 807 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 808 } 809 Loc = UO->getOperatorLoc(); 810 R1 = UO->getSubExpr()->getSourceRange(); 811 return true; 812 } 813 case BinaryOperatorClass: { 814 const BinaryOperator *BO = cast<BinaryOperator>(this); 815 // Consider comma to have side effects if the LHS or RHS does. 816 if (BO->getOpcode() == BinaryOperator::Comma) 817 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 818 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 819 820 if (BO->isAssignmentOp()) 821 return false; 822 Loc = BO->getOperatorLoc(); 823 R1 = BO->getLHS()->getSourceRange(); 824 R2 = BO->getRHS()->getSourceRange(); 825 return true; 826 } 827 case CompoundAssignOperatorClass: 828 return false; 829 830 case ConditionalOperatorClass: { 831 // The condition must be evaluated, but if either the LHS or RHS is a 832 // warning, warn about them. 833 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 834 if (Exp->getLHS() && 835 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 836 return true; 837 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 838 } 839 840 case MemberExprClass: 841 // If the base pointer or element is to a volatile pointer/field, accessing 842 // it is a side effect. 843 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 844 return false; 845 Loc = cast<MemberExpr>(this)->getMemberLoc(); 846 R1 = SourceRange(Loc, Loc); 847 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 848 return true; 849 850 case ArraySubscriptExprClass: 851 // If the base pointer or element is to a volatile pointer/field, accessing 852 // it is a side effect. 853 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 854 return false; 855 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 856 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 857 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 858 return true; 859 860 case CallExprClass: 861 case CXXOperatorCallExprClass: 862 case CXXMemberCallExprClass: { 863 // If this is a direct call, get the callee. 864 const CallExpr *CE = cast<CallExpr>(this); 865 if (const Decl *FD = CE->getCalleeDecl()) { 866 // If the callee has attribute pure, const, or warn_unused_result, warn 867 // about it. void foo() { strlen("bar"); } should warn. 868 // 869 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 870 // updated to match for QoI. 871 if (FD->getAttr<WarnUnusedResultAttr>() || 872 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 873 Loc = CE->getCallee()->getLocStart(); 874 R1 = CE->getCallee()->getSourceRange(); 875 876 if (unsigned NumArgs = CE->getNumArgs()) 877 R2 = SourceRange(CE->getArg(0)->getLocStart(), 878 CE->getArg(NumArgs-1)->getLocEnd()); 879 return true; 880 } 881 } 882 return false; 883 } 884 885 case CXXTemporaryObjectExprClass: 886 case CXXConstructExprClass: 887 return false; 888 889 case ObjCMessageExprClass: 890 return false; 891 892 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 893#if 0 894 const ObjCImplicitSetterGetterRefExpr *Ref = 895 cast<ObjCImplicitSetterGetterRefExpr>(this); 896 // FIXME: We really want the location of the '.' here. 897 Loc = Ref->getLocation(); 898 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 899 if (Ref->getBase()) 900 R2 = Ref->getBase()->getSourceRange(); 901#else 902 Loc = getExprLoc(); 903 R1 = getSourceRange(); 904#endif 905 return true; 906 } 907 case StmtExprClass: { 908 // Statement exprs don't logically have side effects themselves, but are 909 // sometimes used in macros in ways that give them a type that is unused. 910 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 911 // however, if the result of the stmt expr is dead, we don't want to emit a 912 // warning. 913 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 914 if (!CS->body_empty()) 915 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 916 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 917 918 Loc = cast<StmtExpr>(this)->getLParenLoc(); 919 R1 = getSourceRange(); 920 return true; 921 } 922 case CStyleCastExprClass: 923 // If this is an explicit cast to void, allow it. People do this when they 924 // think they know what they're doing :). 925 if (getType()->isVoidType()) 926 return false; 927 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 928 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 929 return true; 930 case CXXFunctionalCastExprClass: { 931 const CastExpr *CE = cast<CastExpr>(this); 932 933 // If this is a cast to void or a constructor conversion, check the operand. 934 // Otherwise, the result of the cast is unused. 935 if (CE->getCastKind() == CastExpr::CK_ToVoid || 936 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 937 return (cast<CastExpr>(this)->getSubExpr() 938 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 939 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 940 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 941 return true; 942 } 943 944 case ImplicitCastExprClass: 945 // Check the operand, since implicit casts are inserted by Sema 946 return (cast<ImplicitCastExpr>(this) 947 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 948 949 case CXXDefaultArgExprClass: 950 return (cast<CXXDefaultArgExpr>(this) 951 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 952 953 case CXXNewExprClass: 954 // FIXME: In theory, there might be new expressions that don't have side 955 // effects (e.g. a placement new with an uninitialized POD). 956 case CXXDeleteExprClass: 957 return false; 958 case CXXBindTemporaryExprClass: 959 return (cast<CXXBindTemporaryExpr>(this) 960 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 961 case CXXExprWithTemporariesClass: 962 return (cast<CXXExprWithTemporaries>(this) 963 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 964 } 965} 966 967/// DeclCanBeLvalue - Determine whether the given declaration can be 968/// an lvalue. This is a helper routine for isLvalue. 969static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 970 // C++ [temp.param]p6: 971 // A non-type non-reference template-parameter is not an lvalue. 972 if (const NonTypeTemplateParmDecl *NTTParm 973 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 974 return NTTParm->getType()->isReferenceType(); 975 976 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 977 // C++ 3.10p2: An lvalue refers to an object or function. 978 (Ctx.getLangOptions().CPlusPlus && 979 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 980} 981 982/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 983/// incomplete type other than void. Nonarray expressions that can be lvalues: 984/// - name, where name must be a variable 985/// - e[i] 986/// - (e), where e must be an lvalue 987/// - e.name, where e must be an lvalue 988/// - e->name 989/// - *e, the type of e cannot be a function type 990/// - string-constant 991/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 992/// - reference type [C++ [expr]] 993/// 994Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 995 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 996 997 isLvalueResult Res = isLvalueInternal(Ctx); 998 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 999 return Res; 1000 1001 // first, check the type (C99 6.3.2.1). Expressions with function 1002 // type in C are not lvalues, but they can be lvalues in C++. 1003 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1004 return LV_NotObjectType; 1005 1006 // Allow qualified void which is an incomplete type other than void (yuck). 1007 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1008 return LV_IncompleteVoidType; 1009 1010 return LV_Valid; 1011} 1012 1013// Check whether the expression can be sanely treated like an l-value 1014Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1015 switch (getStmtClass()) { 1016 case ObjCIsaExprClass: 1017 case StringLiteralClass: // C99 6.5.1p4 1018 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1019 return LV_Valid; 1020 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1021 // For vectors, make sure base is an lvalue (i.e. not a function call). 1022 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1023 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1024 return LV_Valid; 1025 case DeclRefExprClass: { // C99 6.5.1p2 1026 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1027 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1028 return LV_Valid; 1029 break; 1030 } 1031 case BlockDeclRefExprClass: { 1032 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1033 if (isa<VarDecl>(BDR->getDecl())) 1034 return LV_Valid; 1035 break; 1036 } 1037 case MemberExprClass: { 1038 const MemberExpr *m = cast<MemberExpr>(this); 1039 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1040 NamedDecl *Member = m->getMemberDecl(); 1041 // C++ [expr.ref]p4: 1042 // If E2 is declared to have type "reference to T", then E1.E2 1043 // is an lvalue. 1044 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1045 if (Value->getType()->isReferenceType()) 1046 return LV_Valid; 1047 1048 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1049 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1050 return LV_Valid; 1051 1052 // -- If E2 is a non-static data member [...]. If E1 is an 1053 // lvalue, then E1.E2 is an lvalue. 1054 if (isa<FieldDecl>(Member)) { 1055 if (m->isArrow()) 1056 return LV_Valid; 1057 Expr *BaseExp = m->getBase(); 1058 return (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) ? 1059 LV_SubObjCPropertySetting : BaseExp->isLvalue(Ctx); 1060 } 1061 1062 // -- If it refers to a static member function [...], then 1063 // E1.E2 is an lvalue. 1064 // -- Otherwise, if E1.E2 refers to a non-static member 1065 // function [...], then E1.E2 is not an lvalue. 1066 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1067 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1068 1069 // -- If E2 is a member enumerator [...], the expression E1.E2 1070 // is not an lvalue. 1071 if (isa<EnumConstantDecl>(Member)) 1072 return LV_InvalidExpression; 1073 1074 // Not an lvalue. 1075 return LV_InvalidExpression; 1076 } 1077 1078 // C99 6.5.2.3p4 1079 if (m->isArrow()) 1080 return LV_Valid; 1081 Expr *BaseExp = m->getBase(); 1082 return (BaseExp->getStmtClass() == ObjCPropertyRefExprClass) ? 1083 LV_SubObjCPropertySetting : BaseExp->isLvalue(Ctx); 1084 } 1085 case UnaryOperatorClass: 1086 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1087 return LV_Valid; // C99 6.5.3p4 1088 1089 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1090 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1091 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1092 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1093 1094 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1095 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1096 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1097 return LV_Valid; 1098 break; 1099 case ImplicitCastExprClass: 1100 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1101 : LV_InvalidExpression; 1102 case ParenExprClass: // C99 6.5.1p5 1103 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1104 case BinaryOperatorClass: 1105 case CompoundAssignOperatorClass: { 1106 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1107 1108 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1109 BinOp->getOpcode() == BinaryOperator::Comma) 1110 return BinOp->getRHS()->isLvalue(Ctx); 1111 1112 // C++ [expr.mptr.oper]p6 1113 // The result of a .* expression is an lvalue only if its first operand is 1114 // an lvalue and its second operand is a pointer to data member. 1115 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1116 !BinOp->getType()->isFunctionType()) 1117 return BinOp->getLHS()->isLvalue(Ctx); 1118 1119 // The result of an ->* expression is an lvalue only if its second operand 1120 // is a pointer to data member. 1121 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1122 !BinOp->getType()->isFunctionType()) { 1123 QualType Ty = BinOp->getRHS()->getType(); 1124 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1125 return LV_Valid; 1126 } 1127 1128 if (!BinOp->isAssignmentOp()) 1129 return LV_InvalidExpression; 1130 1131 if (Ctx.getLangOptions().CPlusPlus) 1132 // C++ [expr.ass]p1: 1133 // The result of an assignment operation [...] is an lvalue. 1134 return LV_Valid; 1135 1136 1137 // C99 6.5.16: 1138 // An assignment expression [...] is not an lvalue. 1139 return LV_InvalidExpression; 1140 } 1141 case CallExprClass: 1142 case CXXOperatorCallExprClass: 1143 case CXXMemberCallExprClass: { 1144 // C++0x [expr.call]p10 1145 // A function call is an lvalue if and only if the result type 1146 // is an lvalue reference. 1147 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1148 if (ReturnType->isLValueReferenceType()) 1149 return LV_Valid; 1150 1151 break; 1152 } 1153 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1154 return LV_Valid; 1155 case ChooseExprClass: 1156 // __builtin_choose_expr is an lvalue if the selected operand is. 1157 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1158 case ExtVectorElementExprClass: 1159 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1160 return LV_DuplicateVectorComponents; 1161 return LV_Valid; 1162 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1163 return LV_Valid; 1164 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1165 return LV_Valid; 1166 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1167 return LV_Valid; 1168 case PredefinedExprClass: 1169 return LV_Valid; 1170 case UnresolvedLookupExprClass: 1171 return LV_Valid; 1172 case CXXDefaultArgExprClass: 1173 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1174 case CStyleCastExprClass: 1175 case CXXFunctionalCastExprClass: 1176 case CXXStaticCastExprClass: 1177 case CXXDynamicCastExprClass: 1178 case CXXReinterpretCastExprClass: 1179 case CXXConstCastExprClass: 1180 // The result of an explicit cast is an lvalue if the type we are 1181 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1182 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1183 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1184 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1185 isLValueReferenceType()) 1186 return LV_Valid; 1187 break; 1188 case CXXTypeidExprClass: 1189 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1190 return LV_Valid; 1191 case CXXBindTemporaryExprClass: 1192 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1193 isLvalueInternal(Ctx); 1194 case ConditionalOperatorClass: { 1195 // Complicated handling is only for C++. 1196 if (!Ctx.getLangOptions().CPlusPlus) 1197 return LV_InvalidExpression; 1198 1199 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1200 // everywhere there's an object converted to an rvalue. Also, any other 1201 // casts should be wrapped by ImplicitCastExprs. There's just the special 1202 // case involving throws to work out. 1203 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1204 Expr *True = Cond->getTrueExpr(); 1205 Expr *False = Cond->getFalseExpr(); 1206 // C++0x 5.16p2 1207 // If either the second or the third operand has type (cv) void, [...] 1208 // the result [...] is an rvalue. 1209 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1210 return LV_InvalidExpression; 1211 1212 // Both sides must be lvalues for the result to be an lvalue. 1213 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1214 return LV_InvalidExpression; 1215 1216 // That's it. 1217 return LV_Valid; 1218 } 1219 1220 case Expr::CXXExprWithTemporariesClass: 1221 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1222 1223 case Expr::ObjCMessageExprClass: 1224 if (const ObjCMethodDecl *Method 1225 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1226 if (Method->getResultType()->isLValueReferenceType()) 1227 return LV_Valid; 1228 break; 1229 1230 default: 1231 break; 1232 } 1233 return LV_InvalidExpression; 1234} 1235 1236/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1237/// does not have an incomplete type, does not have a const-qualified type, and 1238/// if it is a structure or union, does not have any member (including, 1239/// recursively, any member or element of all contained aggregates or unions) 1240/// with a const-qualified type. 1241Expr::isModifiableLvalueResult 1242Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1243 isLvalueResult lvalResult = isLvalue(Ctx); 1244 1245 switch (lvalResult) { 1246 case LV_Valid: 1247 // C++ 3.10p11: Functions cannot be modified, but pointers to 1248 // functions can be modifiable. 1249 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1250 return MLV_NotObjectType; 1251 break; 1252 1253 case LV_NotObjectType: return MLV_NotObjectType; 1254 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1255 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1256 case LV_InvalidExpression: 1257 // If the top level is a C-style cast, and the subexpression is a valid 1258 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1259 // GCC extension. We don't support it, but we want to produce good 1260 // diagnostics when it happens so that the user knows why. 1261 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1262 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1263 if (Loc) 1264 *Loc = CE->getLParenLoc(); 1265 return MLV_LValueCast; 1266 } 1267 } 1268 return MLV_InvalidExpression; 1269 case LV_MemberFunction: return MLV_MemberFunction; 1270 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1271 } 1272 1273 // The following is illegal: 1274 // void takeclosure(void (^C)(void)); 1275 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1276 // 1277 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1278 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1279 return MLV_NotBlockQualified; 1280 } 1281 1282 // Assigning to an 'implicit' property? 1283 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1284 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1285 if (Expr->getSetterMethod() == 0) 1286 return MLV_NoSetterProperty; 1287 } 1288 1289 QualType CT = Ctx.getCanonicalType(getType()); 1290 1291 if (CT.isConstQualified()) 1292 return MLV_ConstQualified; 1293 if (CT->isArrayType()) 1294 return MLV_ArrayType; 1295 if (CT->isIncompleteType()) 1296 return MLV_IncompleteType; 1297 1298 if (const RecordType *r = CT->getAs<RecordType>()) { 1299 if (r->hasConstFields()) 1300 return MLV_ConstQualified; 1301 } 1302 1303 return MLV_Valid; 1304} 1305 1306/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1307/// returns true, if it is; false otherwise. 1308bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1309 switch (getStmtClass()) { 1310 default: 1311 return false; 1312 case ObjCIvarRefExprClass: 1313 return true; 1314 case Expr::UnaryOperatorClass: 1315 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1316 case ParenExprClass: 1317 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1318 case ImplicitCastExprClass: 1319 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1320 case CStyleCastExprClass: 1321 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1322 case DeclRefExprClass: { 1323 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1324 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1325 if (VD->hasGlobalStorage()) 1326 return true; 1327 QualType T = VD->getType(); 1328 // dereferencing to a pointer is always a gc'able candidate, 1329 // unless it is __weak. 1330 return T->isPointerType() && 1331 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1332 } 1333 return false; 1334 } 1335 case MemberExprClass: { 1336 const MemberExpr *M = cast<MemberExpr>(this); 1337 return M->getBase()->isOBJCGCCandidate(Ctx); 1338 } 1339 case ArraySubscriptExprClass: 1340 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1341 } 1342} 1343Expr* Expr::IgnoreParens() { 1344 Expr* E = this; 1345 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1346 E = P->getSubExpr(); 1347 1348 return E; 1349} 1350 1351/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1352/// or CastExprs or ImplicitCastExprs, returning their operand. 1353Expr *Expr::IgnoreParenCasts() { 1354 Expr *E = this; 1355 while (true) { 1356 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1357 E = P->getSubExpr(); 1358 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1359 E = P->getSubExpr(); 1360 else 1361 return E; 1362 } 1363} 1364 1365/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1366/// value (including ptr->int casts of the same size). Strip off any 1367/// ParenExpr or CastExprs, returning their operand. 1368Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1369 Expr *E = this; 1370 while (true) { 1371 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1372 E = P->getSubExpr(); 1373 continue; 1374 } 1375 1376 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1377 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1378 // ptr<->int casts of the same width. We also ignore all identify casts. 1379 Expr *SE = P->getSubExpr(); 1380 1381 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1382 E = SE; 1383 continue; 1384 } 1385 1386 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1387 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1388 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1389 E = SE; 1390 continue; 1391 } 1392 } 1393 1394 return E; 1395 } 1396} 1397 1398bool Expr::isDefaultArgument() const { 1399 const Expr *E = this; 1400 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1401 E = ICE->getSubExprAsWritten(); 1402 1403 return isa<CXXDefaultArgExpr>(E); 1404} 1405 1406/// hasAnyTypeDependentArguments - Determines if any of the expressions 1407/// in Exprs is type-dependent. 1408bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1409 for (unsigned I = 0; I < NumExprs; ++I) 1410 if (Exprs[I]->isTypeDependent()) 1411 return true; 1412 1413 return false; 1414} 1415 1416/// hasAnyValueDependentArguments - Determines if any of the expressions 1417/// in Exprs is value-dependent. 1418bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1419 for (unsigned I = 0; I < NumExprs; ++I) 1420 if (Exprs[I]->isValueDependent()) 1421 return true; 1422 1423 return false; 1424} 1425 1426bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1427 // This function is attempting whether an expression is an initializer 1428 // which can be evaluated at compile-time. isEvaluatable handles most 1429 // of the cases, but it can't deal with some initializer-specific 1430 // expressions, and it can't deal with aggregates; we deal with those here, 1431 // and fall back to isEvaluatable for the other cases. 1432 1433 // FIXME: This function assumes the variable being assigned to 1434 // isn't a reference type! 1435 1436 switch (getStmtClass()) { 1437 default: break; 1438 case StringLiteralClass: 1439 case ObjCStringLiteralClass: 1440 case ObjCEncodeExprClass: 1441 return true; 1442 case CompoundLiteralExprClass: { 1443 // This handles gcc's extension that allows global initializers like 1444 // "struct x {int x;} x = (struct x) {};". 1445 // FIXME: This accepts other cases it shouldn't! 1446 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1447 return Exp->isConstantInitializer(Ctx); 1448 } 1449 case InitListExprClass: { 1450 // FIXME: This doesn't deal with fields with reference types correctly. 1451 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1452 // to bitfields. 1453 const InitListExpr *Exp = cast<InitListExpr>(this); 1454 unsigned numInits = Exp->getNumInits(); 1455 for (unsigned i = 0; i < numInits; i++) { 1456 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1457 return false; 1458 } 1459 return true; 1460 } 1461 case ImplicitValueInitExprClass: 1462 return true; 1463 case ParenExprClass: 1464 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1465 case UnaryOperatorClass: { 1466 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1467 if (Exp->getOpcode() == UnaryOperator::Extension) 1468 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1469 break; 1470 } 1471 case BinaryOperatorClass: { 1472 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1473 // but this handles the common case. 1474 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1475 if (Exp->getOpcode() == BinaryOperator::Sub && 1476 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1477 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1478 return true; 1479 break; 1480 } 1481 case ImplicitCastExprClass: 1482 case CStyleCastExprClass: 1483 // Handle casts with a destination that's a struct or union; this 1484 // deals with both the gcc no-op struct cast extension and the 1485 // cast-to-union extension. 1486 if (getType()->isRecordType()) 1487 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1488 1489 // Integer->integer casts can be handled here, which is important for 1490 // things like (int)(&&x-&&y). Scary but true. 1491 if (getType()->isIntegerType() && 1492 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1493 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1494 1495 break; 1496 } 1497 return isEvaluatable(Ctx); 1498} 1499 1500/// isIntegerConstantExpr - this recursive routine will test if an expression is 1501/// an integer constant expression. 1502 1503/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1504/// comma, etc 1505/// 1506/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1507/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1508/// cast+dereference. 1509 1510// CheckICE - This function does the fundamental ICE checking: the returned 1511// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1512// Note that to reduce code duplication, this helper does no evaluation 1513// itself; the caller checks whether the expression is evaluatable, and 1514// in the rare cases where CheckICE actually cares about the evaluated 1515// value, it calls into Evalute. 1516// 1517// Meanings of Val: 1518// 0: This expression is an ICE if it can be evaluated by Evaluate. 1519// 1: This expression is not an ICE, but if it isn't evaluated, it's 1520// a legal subexpression for an ICE. This return value is used to handle 1521// the comma operator in C99 mode. 1522// 2: This expression is not an ICE, and is not a legal subexpression for one. 1523 1524struct ICEDiag { 1525 unsigned Val; 1526 SourceLocation Loc; 1527 1528 public: 1529 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1530 ICEDiag() : Val(0) {} 1531}; 1532 1533ICEDiag NoDiag() { return ICEDiag(); } 1534 1535static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1536 Expr::EvalResult EVResult; 1537 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1538 !EVResult.Val.isInt()) { 1539 return ICEDiag(2, E->getLocStart()); 1540 } 1541 return NoDiag(); 1542} 1543 1544static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1545 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1546 if (!E->getType()->isIntegralType()) { 1547 return ICEDiag(2, E->getLocStart()); 1548 } 1549 1550 switch (E->getStmtClass()) { 1551#define STMT(Node, Base) case Expr::Node##Class: 1552#define EXPR(Node, Base) 1553#include "clang/AST/StmtNodes.def" 1554 case Expr::PredefinedExprClass: 1555 case Expr::FloatingLiteralClass: 1556 case Expr::ImaginaryLiteralClass: 1557 case Expr::StringLiteralClass: 1558 case Expr::ArraySubscriptExprClass: 1559 case Expr::MemberExprClass: 1560 case Expr::CompoundAssignOperatorClass: 1561 case Expr::CompoundLiteralExprClass: 1562 case Expr::ExtVectorElementExprClass: 1563 case Expr::InitListExprClass: 1564 case Expr::DesignatedInitExprClass: 1565 case Expr::ImplicitValueInitExprClass: 1566 case Expr::ParenListExprClass: 1567 case Expr::VAArgExprClass: 1568 case Expr::AddrLabelExprClass: 1569 case Expr::StmtExprClass: 1570 case Expr::CXXMemberCallExprClass: 1571 case Expr::CXXDynamicCastExprClass: 1572 case Expr::CXXTypeidExprClass: 1573 case Expr::CXXNullPtrLiteralExprClass: 1574 case Expr::CXXThisExprClass: 1575 case Expr::CXXThrowExprClass: 1576 case Expr::CXXNewExprClass: 1577 case Expr::CXXDeleteExprClass: 1578 case Expr::CXXPseudoDestructorExprClass: 1579 case Expr::UnresolvedLookupExprClass: 1580 case Expr::DependentScopeDeclRefExprClass: 1581 case Expr::CXXConstructExprClass: 1582 case Expr::CXXBindTemporaryExprClass: 1583 case Expr::CXXExprWithTemporariesClass: 1584 case Expr::CXXTemporaryObjectExprClass: 1585 case Expr::CXXUnresolvedConstructExprClass: 1586 case Expr::CXXDependentScopeMemberExprClass: 1587 case Expr::UnresolvedMemberExprClass: 1588 case Expr::ObjCStringLiteralClass: 1589 case Expr::ObjCEncodeExprClass: 1590 case Expr::ObjCMessageExprClass: 1591 case Expr::ObjCSelectorExprClass: 1592 case Expr::ObjCProtocolExprClass: 1593 case Expr::ObjCIvarRefExprClass: 1594 case Expr::ObjCPropertyRefExprClass: 1595 case Expr::ObjCImplicitSetterGetterRefExprClass: 1596 case Expr::ObjCSuperExprClass: 1597 case Expr::ObjCIsaExprClass: 1598 case Expr::ShuffleVectorExprClass: 1599 case Expr::BlockExprClass: 1600 case Expr::BlockDeclRefExprClass: 1601 case Expr::NoStmtClass: 1602 case Expr::ExprClass: 1603 return ICEDiag(2, E->getLocStart()); 1604 1605 case Expr::GNUNullExprClass: 1606 // GCC considers the GNU __null value to be an integral constant expression. 1607 return NoDiag(); 1608 1609 case Expr::ParenExprClass: 1610 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1611 case Expr::IntegerLiteralClass: 1612 case Expr::CharacterLiteralClass: 1613 case Expr::CXXBoolLiteralExprClass: 1614 case Expr::CXXZeroInitValueExprClass: 1615 case Expr::TypesCompatibleExprClass: 1616 case Expr::UnaryTypeTraitExprClass: 1617 return NoDiag(); 1618 case Expr::CallExprClass: 1619 case Expr::CXXOperatorCallExprClass: { 1620 const CallExpr *CE = cast<CallExpr>(E); 1621 if (CE->isBuiltinCall(Ctx)) 1622 return CheckEvalInICE(E, Ctx); 1623 return ICEDiag(2, E->getLocStart()); 1624 } 1625 case Expr::DeclRefExprClass: 1626 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1627 return NoDiag(); 1628 if (Ctx.getLangOptions().CPlusPlus && 1629 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1630 // C++ 7.1.5.1p2 1631 // A variable of non-volatile const-qualified integral or enumeration 1632 // type initialized by an ICE can be used in ICEs. 1633 if (const VarDecl *Dcl = 1634 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1635 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1636 if (Quals.hasVolatile() || !Quals.hasConst()) 1637 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1638 1639 // Look for the definition of this variable, which will actually have 1640 // an initializer. 1641 const VarDecl *Def = 0; 1642 const Expr *Init = Dcl->getDefinition(Def); 1643 if (Init) { 1644 if (Def->isInitKnownICE()) { 1645 // We have already checked whether this subexpression is an 1646 // integral constant expression. 1647 if (Def->isInitICE()) 1648 return NoDiag(); 1649 else 1650 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1651 } 1652 1653 // C++ [class.static.data]p4: 1654 // If a static data member is of const integral or const 1655 // enumeration type, its declaration in the class definition can 1656 // specify a constant-initializer which shall be an integral 1657 // constant expression (5.19). In that case, the member can appear 1658 // in integral constant expressions. 1659 if (Def->isOutOfLine()) { 1660 Dcl->setInitKnownICE(false); 1661 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1662 } 1663 1664 if (Dcl->isCheckingICE()) { 1665 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1666 } 1667 1668 Dcl->setCheckingICE(); 1669 ICEDiag Result = CheckICE(Init, Ctx); 1670 // Cache the result of the ICE test. 1671 Dcl->setInitKnownICE(Result.Val == 0); 1672 return Result; 1673 } 1674 } 1675 } 1676 return ICEDiag(2, E->getLocStart()); 1677 case Expr::UnaryOperatorClass: { 1678 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1679 switch (Exp->getOpcode()) { 1680 case UnaryOperator::PostInc: 1681 case UnaryOperator::PostDec: 1682 case UnaryOperator::PreInc: 1683 case UnaryOperator::PreDec: 1684 case UnaryOperator::AddrOf: 1685 case UnaryOperator::Deref: 1686 return ICEDiag(2, E->getLocStart()); 1687 1688 case UnaryOperator::Extension: 1689 case UnaryOperator::LNot: 1690 case UnaryOperator::Plus: 1691 case UnaryOperator::Minus: 1692 case UnaryOperator::Not: 1693 case UnaryOperator::Real: 1694 case UnaryOperator::Imag: 1695 return CheckICE(Exp->getSubExpr(), Ctx); 1696 case UnaryOperator::OffsetOf: 1697 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1698 // Evaluate matches the proposed gcc behavior for cases like 1699 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1700 // compliance: we should warn earlier for offsetof expressions with 1701 // array subscripts that aren't ICEs, and if the array subscripts 1702 // are ICEs, the value of the offsetof must be an integer constant. 1703 return CheckEvalInICE(E, Ctx); 1704 } 1705 } 1706 case Expr::SizeOfAlignOfExprClass: { 1707 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1708 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1709 return ICEDiag(2, E->getLocStart()); 1710 return NoDiag(); 1711 } 1712 case Expr::BinaryOperatorClass: { 1713 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1714 switch (Exp->getOpcode()) { 1715 case BinaryOperator::PtrMemD: 1716 case BinaryOperator::PtrMemI: 1717 case BinaryOperator::Assign: 1718 case BinaryOperator::MulAssign: 1719 case BinaryOperator::DivAssign: 1720 case BinaryOperator::RemAssign: 1721 case BinaryOperator::AddAssign: 1722 case BinaryOperator::SubAssign: 1723 case BinaryOperator::ShlAssign: 1724 case BinaryOperator::ShrAssign: 1725 case BinaryOperator::AndAssign: 1726 case BinaryOperator::XorAssign: 1727 case BinaryOperator::OrAssign: 1728 return ICEDiag(2, E->getLocStart()); 1729 1730 case BinaryOperator::Mul: 1731 case BinaryOperator::Div: 1732 case BinaryOperator::Rem: 1733 case BinaryOperator::Add: 1734 case BinaryOperator::Sub: 1735 case BinaryOperator::Shl: 1736 case BinaryOperator::Shr: 1737 case BinaryOperator::LT: 1738 case BinaryOperator::GT: 1739 case BinaryOperator::LE: 1740 case BinaryOperator::GE: 1741 case BinaryOperator::EQ: 1742 case BinaryOperator::NE: 1743 case BinaryOperator::And: 1744 case BinaryOperator::Xor: 1745 case BinaryOperator::Or: 1746 case BinaryOperator::Comma: { 1747 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1748 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1749 if (Exp->getOpcode() == BinaryOperator::Div || 1750 Exp->getOpcode() == BinaryOperator::Rem) { 1751 // Evaluate gives an error for undefined Div/Rem, so make sure 1752 // we don't evaluate one. 1753 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1754 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1755 if (REval == 0) 1756 return ICEDiag(1, E->getLocStart()); 1757 if (REval.isSigned() && REval.isAllOnesValue()) { 1758 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1759 if (LEval.isMinSignedValue()) 1760 return ICEDiag(1, E->getLocStart()); 1761 } 1762 } 1763 } 1764 if (Exp->getOpcode() == BinaryOperator::Comma) { 1765 if (Ctx.getLangOptions().C99) { 1766 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1767 // if it isn't evaluated. 1768 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1769 return ICEDiag(1, E->getLocStart()); 1770 } else { 1771 // In both C89 and C++, commas in ICEs are illegal. 1772 return ICEDiag(2, E->getLocStart()); 1773 } 1774 } 1775 if (LHSResult.Val >= RHSResult.Val) 1776 return LHSResult; 1777 return RHSResult; 1778 } 1779 case BinaryOperator::LAnd: 1780 case BinaryOperator::LOr: { 1781 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1782 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1783 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1784 // Rare case where the RHS has a comma "side-effect"; we need 1785 // to actually check the condition to see whether the side 1786 // with the comma is evaluated. 1787 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1788 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1789 return RHSResult; 1790 return NoDiag(); 1791 } 1792 1793 if (LHSResult.Val >= RHSResult.Val) 1794 return LHSResult; 1795 return RHSResult; 1796 } 1797 } 1798 } 1799 case Expr::CastExprClass: 1800 case Expr::ImplicitCastExprClass: 1801 case Expr::ExplicitCastExprClass: 1802 case Expr::CStyleCastExprClass: 1803 case Expr::CXXFunctionalCastExprClass: 1804 case Expr::CXXNamedCastExprClass: 1805 case Expr::CXXStaticCastExprClass: 1806 case Expr::CXXReinterpretCastExprClass: 1807 case Expr::CXXConstCastExprClass: { 1808 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1809 if (SubExpr->getType()->isIntegralType()) 1810 return CheckICE(SubExpr, Ctx); 1811 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1812 return NoDiag(); 1813 return ICEDiag(2, E->getLocStart()); 1814 } 1815 case Expr::ConditionalOperatorClass: { 1816 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1817 // If the condition (ignoring parens) is a __builtin_constant_p call, 1818 // then only the true side is actually considered in an integer constant 1819 // expression, and it is fully evaluated. This is an important GNU 1820 // extension. See GCC PR38377 for discussion. 1821 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1822 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1823 Expr::EvalResult EVResult; 1824 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1825 !EVResult.Val.isInt()) { 1826 return ICEDiag(2, E->getLocStart()); 1827 } 1828 return NoDiag(); 1829 } 1830 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1831 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1832 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1833 if (CondResult.Val == 2) 1834 return CondResult; 1835 if (TrueResult.Val == 2) 1836 return TrueResult; 1837 if (FalseResult.Val == 2) 1838 return FalseResult; 1839 if (CondResult.Val == 1) 1840 return CondResult; 1841 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1842 return NoDiag(); 1843 // Rare case where the diagnostics depend on which side is evaluated 1844 // Note that if we get here, CondResult is 0, and at least one of 1845 // TrueResult and FalseResult is non-zero. 1846 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1847 return FalseResult; 1848 } 1849 return TrueResult; 1850 } 1851 case Expr::CXXDefaultArgExprClass: 1852 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1853 case Expr::ChooseExprClass: { 1854 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1855 } 1856 } 1857 1858 // Silence a GCC warning 1859 return ICEDiag(2, E->getLocStart()); 1860} 1861 1862bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1863 SourceLocation *Loc, bool isEvaluated) const { 1864 ICEDiag d = CheckICE(this, Ctx); 1865 if (d.Val != 0) { 1866 if (Loc) *Loc = d.Loc; 1867 return false; 1868 } 1869 EvalResult EvalResult; 1870 if (!Evaluate(EvalResult, Ctx)) 1871 llvm_unreachable("ICE cannot be evaluated!"); 1872 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1873 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1874 Result = EvalResult.Val.getInt(); 1875 return true; 1876} 1877 1878/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1879/// integer constant expression with the value zero, or if this is one that is 1880/// cast to void*. 1881bool Expr::isNullPointerConstant(ASTContext &Ctx, 1882 NullPointerConstantValueDependence NPC) const { 1883 if (isValueDependent()) { 1884 switch (NPC) { 1885 case NPC_NeverValueDependent: 1886 assert(false && "Unexpected value dependent expression!"); 1887 // If the unthinkable happens, fall through to the safest alternative. 1888 1889 case NPC_ValueDependentIsNull: 1890 return isTypeDependent() || getType()->isIntegralType(); 1891 1892 case NPC_ValueDependentIsNotNull: 1893 return false; 1894 } 1895 } 1896 1897 // Strip off a cast to void*, if it exists. Except in C++. 1898 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1899 if (!Ctx.getLangOptions().CPlusPlus) { 1900 // Check that it is a cast to void*. 1901 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1902 QualType Pointee = PT->getPointeeType(); 1903 if (!Pointee.hasQualifiers() && 1904 Pointee->isVoidType() && // to void* 1905 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1906 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1907 } 1908 } 1909 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1910 // Ignore the ImplicitCastExpr type entirely. 1911 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1912 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1913 // Accept ((void*)0) as a null pointer constant, as many other 1914 // implementations do. 1915 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1916 } else if (const CXXDefaultArgExpr *DefaultArg 1917 = dyn_cast<CXXDefaultArgExpr>(this)) { 1918 // See through default argument expressions 1919 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1920 } else if (isa<GNUNullExpr>(this)) { 1921 // The GNU __null extension is always a null pointer constant. 1922 return true; 1923 } 1924 1925 // C++0x nullptr_t is always a null pointer constant. 1926 if (getType()->isNullPtrType()) 1927 return true; 1928 1929 // This expression must be an integer type. 1930 if (!getType()->isIntegerType() || 1931 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1932 return false; 1933 1934 // If we have an integer constant expression, we need to *evaluate* it and 1935 // test for the value 0. 1936 llvm::APSInt Result; 1937 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1938} 1939 1940FieldDecl *Expr::getBitField() { 1941 Expr *E = this->IgnoreParens(); 1942 1943 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1944 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1945 if (Field->isBitField()) 1946 return Field; 1947 1948 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1949 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1950 return BinOp->getLHS()->getBitField(); 1951 1952 return 0; 1953} 1954 1955/// isArrow - Return true if the base expression is a pointer to vector, 1956/// return false if the base expression is a vector. 1957bool ExtVectorElementExpr::isArrow() const { 1958 return getBase()->getType()->isPointerType(); 1959} 1960 1961unsigned ExtVectorElementExpr::getNumElements() const { 1962 if (const VectorType *VT = getType()->getAs<VectorType>()) 1963 return VT->getNumElements(); 1964 return 1; 1965} 1966 1967/// containsDuplicateElements - Return true if any element access is repeated. 1968bool ExtVectorElementExpr::containsDuplicateElements() const { 1969 // FIXME: Refactor this code to an accessor on the AST node which returns the 1970 // "type" of component access, and share with code below and in Sema. 1971 llvm::StringRef Comp = Accessor->getName(); 1972 1973 // Halving swizzles do not contain duplicate elements. 1974 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1975 return false; 1976 1977 // Advance past s-char prefix on hex swizzles. 1978 if (Comp[0] == 's' || Comp[0] == 'S') 1979 Comp = Comp.substr(1); 1980 1981 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1982 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1983 return true; 1984 1985 return false; 1986} 1987 1988/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1989void ExtVectorElementExpr::getEncodedElementAccess( 1990 llvm::SmallVectorImpl<unsigned> &Elts) const { 1991 llvm::StringRef Comp = Accessor->getName(); 1992 if (Comp[0] == 's' || Comp[0] == 'S') 1993 Comp = Comp.substr(1); 1994 1995 bool isHi = Comp == "hi"; 1996 bool isLo = Comp == "lo"; 1997 bool isEven = Comp == "even"; 1998 bool isOdd = Comp == "odd"; 1999 2000 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2001 uint64_t Index; 2002 2003 if (isHi) 2004 Index = e + i; 2005 else if (isLo) 2006 Index = i; 2007 else if (isEven) 2008 Index = 2 * i; 2009 else if (isOdd) 2010 Index = 2 * i + 1; 2011 else 2012 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2013 2014 Elts.push_back(Index); 2015 } 2016} 2017 2018// constructor for instance messages. 2019ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 2020 QualType retType, ObjCMethodDecl *mproto, 2021 SourceLocation LBrac, SourceLocation RBrac, 2022 Expr **ArgExprs, unsigned nargs) 2023 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2024 MethodProto(mproto) { 2025 NumArgs = nargs; 2026 SubExprs = new Stmt*[NumArgs+1]; 2027 SubExprs[RECEIVER] = receiver; 2028 if (NumArgs) { 2029 for (unsigned i = 0; i != NumArgs; ++i) 2030 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2031 } 2032 LBracloc = LBrac; 2033 RBracloc = RBrac; 2034} 2035 2036// constructor for class messages. 2037// FIXME: clsName should be typed to ObjCInterfaceType 2038ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 2039 QualType retType, ObjCMethodDecl *mproto, 2040 SourceLocation LBrac, SourceLocation RBrac, 2041 Expr **ArgExprs, unsigned nargs) 2042 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2043 MethodProto(mproto) { 2044 NumArgs = nargs; 2045 SubExprs = new Stmt*[NumArgs+1]; 2046 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 2047 if (NumArgs) { 2048 for (unsigned i = 0; i != NumArgs; ++i) 2049 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2050 } 2051 LBracloc = LBrac; 2052 RBracloc = RBrac; 2053} 2054 2055// constructor for class messages. 2056ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2057 QualType retType, ObjCMethodDecl *mproto, 2058 SourceLocation LBrac, SourceLocation RBrac, 2059 Expr **ArgExprs, unsigned nargs) 2060: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2061MethodProto(mproto) { 2062 NumArgs = nargs; 2063 SubExprs = new Stmt*[NumArgs+1]; 2064 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2065 if (NumArgs) { 2066 for (unsigned i = 0; i != NumArgs; ++i) 2067 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2068 } 2069 LBracloc = LBrac; 2070 RBracloc = RBrac; 2071} 2072 2073ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2074 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2075 switch (x & Flags) { 2076 default: 2077 assert(false && "Invalid ObjCMessageExpr."); 2078 case IsInstMeth: 2079 return ClassInfo(0, 0); 2080 case IsClsMethDeclUnknown: 2081 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2082 case IsClsMethDeclKnown: { 2083 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2084 return ClassInfo(D, D->getIdentifier()); 2085 } 2086 } 2087} 2088 2089void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2090 if (CI.first == 0 && CI.second == 0) 2091 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2092 else if (CI.first == 0) 2093 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2094 else 2095 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2096} 2097 2098 2099bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2100 return getCond()->EvaluateAsInt(C) != 0; 2101} 2102 2103void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2104 unsigned NumExprs) { 2105 if (SubExprs) C.Deallocate(SubExprs); 2106 2107 SubExprs = new (C) Stmt* [NumExprs]; 2108 this->NumExprs = NumExprs; 2109 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2110} 2111 2112void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2113 DestroyChildren(C); 2114 if (SubExprs) C.Deallocate(SubExprs); 2115 this->~ShuffleVectorExpr(); 2116 C.Deallocate(this); 2117} 2118 2119void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2120 // Override default behavior of traversing children. If this has a type 2121 // operand and the type is a variable-length array, the child iteration 2122 // will iterate over the size expression. However, this expression belongs 2123 // to the type, not to this, so we don't want to delete it. 2124 // We still want to delete this expression. 2125 if (isArgumentType()) { 2126 this->~SizeOfAlignOfExpr(); 2127 C.Deallocate(this); 2128 } 2129 else 2130 Expr::DoDestroy(C); 2131} 2132 2133//===----------------------------------------------------------------------===// 2134// DesignatedInitExpr 2135//===----------------------------------------------------------------------===// 2136 2137IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2138 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2139 if (Field.NameOrField & 0x01) 2140 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2141 else 2142 return getField()->getIdentifier(); 2143} 2144 2145DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2146 const Designator *Designators, 2147 SourceLocation EqualOrColonLoc, 2148 bool GNUSyntax, 2149 Expr **IndexExprs, 2150 unsigned NumIndexExprs, 2151 Expr *Init) 2152 : Expr(DesignatedInitExprClass, Ty, 2153 Init->isTypeDependent(), Init->isValueDependent()), 2154 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2155 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2156 this->Designators = new Designator[NumDesignators]; 2157 2158 // Record the initializer itself. 2159 child_iterator Child = child_begin(); 2160 *Child++ = Init; 2161 2162 // Copy the designators and their subexpressions, computing 2163 // value-dependence along the way. 2164 unsigned IndexIdx = 0; 2165 for (unsigned I = 0; I != NumDesignators; ++I) { 2166 this->Designators[I] = Designators[I]; 2167 2168 if (this->Designators[I].isArrayDesignator()) { 2169 // Compute type- and value-dependence. 2170 Expr *Index = IndexExprs[IndexIdx]; 2171 ValueDependent = ValueDependent || 2172 Index->isTypeDependent() || Index->isValueDependent(); 2173 2174 // Copy the index expressions into permanent storage. 2175 *Child++ = IndexExprs[IndexIdx++]; 2176 } else if (this->Designators[I].isArrayRangeDesignator()) { 2177 // Compute type- and value-dependence. 2178 Expr *Start = IndexExprs[IndexIdx]; 2179 Expr *End = IndexExprs[IndexIdx + 1]; 2180 ValueDependent = ValueDependent || 2181 Start->isTypeDependent() || Start->isValueDependent() || 2182 End->isTypeDependent() || End->isValueDependent(); 2183 2184 // Copy the start/end expressions into permanent storage. 2185 *Child++ = IndexExprs[IndexIdx++]; 2186 *Child++ = IndexExprs[IndexIdx++]; 2187 } 2188 } 2189 2190 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2191} 2192 2193DesignatedInitExpr * 2194DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2195 unsigned NumDesignators, 2196 Expr **IndexExprs, unsigned NumIndexExprs, 2197 SourceLocation ColonOrEqualLoc, 2198 bool UsesColonSyntax, Expr *Init) { 2199 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2200 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2201 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2202 ColonOrEqualLoc, UsesColonSyntax, 2203 IndexExprs, NumIndexExprs, Init); 2204} 2205 2206DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2207 unsigned NumIndexExprs) { 2208 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2209 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2210 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2211} 2212 2213void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2214 unsigned NumDesigs) { 2215 if (Designators) 2216 delete [] Designators; 2217 2218 Designators = new Designator[NumDesigs]; 2219 NumDesignators = NumDesigs; 2220 for (unsigned I = 0; I != NumDesigs; ++I) 2221 Designators[I] = Desigs[I]; 2222} 2223 2224SourceRange DesignatedInitExpr::getSourceRange() const { 2225 SourceLocation StartLoc; 2226 Designator &First = 2227 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2228 if (First.isFieldDesignator()) { 2229 if (GNUSyntax) 2230 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2231 else 2232 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2233 } else 2234 StartLoc = 2235 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2236 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2237} 2238 2239Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2240 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2241 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2242 Ptr += sizeof(DesignatedInitExpr); 2243 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2244 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2245} 2246 2247Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2248 assert(D.Kind == Designator::ArrayRangeDesignator && 2249 "Requires array range designator"); 2250 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2251 Ptr += sizeof(DesignatedInitExpr); 2252 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2253 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2254} 2255 2256Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2257 assert(D.Kind == Designator::ArrayRangeDesignator && 2258 "Requires array range designator"); 2259 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2260 Ptr += sizeof(DesignatedInitExpr); 2261 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2262 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2263} 2264 2265/// \brief Replaces the designator at index @p Idx with the series 2266/// of designators in [First, Last). 2267void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2268 const Designator *First, 2269 const Designator *Last) { 2270 unsigned NumNewDesignators = Last - First; 2271 if (NumNewDesignators == 0) { 2272 std::copy_backward(Designators + Idx + 1, 2273 Designators + NumDesignators, 2274 Designators + Idx); 2275 --NumNewDesignators; 2276 return; 2277 } else if (NumNewDesignators == 1) { 2278 Designators[Idx] = *First; 2279 return; 2280 } 2281 2282 Designator *NewDesignators 2283 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2284 std::copy(Designators, Designators + Idx, NewDesignators); 2285 std::copy(First, Last, NewDesignators + Idx); 2286 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2287 NewDesignators + Idx + NumNewDesignators); 2288 delete [] Designators; 2289 Designators = NewDesignators; 2290 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2291} 2292 2293void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2294 delete [] Designators; 2295 Expr::DoDestroy(C); 2296} 2297 2298ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2299 Expr **exprs, unsigned nexprs, 2300 SourceLocation rparenloc) 2301: Expr(ParenListExprClass, QualType(), 2302 hasAnyTypeDependentArguments(exprs, nexprs), 2303 hasAnyValueDependentArguments(exprs, nexprs)), 2304 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2305 2306 Exprs = new (C) Stmt*[nexprs]; 2307 for (unsigned i = 0; i != nexprs; ++i) 2308 Exprs[i] = exprs[i]; 2309} 2310 2311void ParenListExpr::DoDestroy(ASTContext& C) { 2312 DestroyChildren(C); 2313 if (Exprs) C.Deallocate(Exprs); 2314 this->~ParenListExpr(); 2315 C.Deallocate(this); 2316} 2317 2318//===----------------------------------------------------------------------===// 2319// ExprIterator. 2320//===----------------------------------------------------------------------===// 2321 2322Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2323Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2324Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2325const Expr* ConstExprIterator::operator[](size_t idx) const { 2326 return cast<Expr>(I[idx]); 2327} 2328const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2329const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2330 2331//===----------------------------------------------------------------------===// 2332// Child Iterators for iterating over subexpressions/substatements 2333//===----------------------------------------------------------------------===// 2334 2335// DeclRefExpr 2336Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2337Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2338 2339// ObjCIvarRefExpr 2340Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2341Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2342 2343// ObjCPropertyRefExpr 2344Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2345Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2346 2347// ObjCImplicitSetterGetterRefExpr 2348Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2349 return &Base; 2350} 2351Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2352 return &Base+1; 2353} 2354 2355// ObjCSuperExpr 2356Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2357Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2358 2359// ObjCIsaExpr 2360Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2361Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2362 2363// PredefinedExpr 2364Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2365Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2366 2367// IntegerLiteral 2368Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2369Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2370 2371// CharacterLiteral 2372Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2373Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2374 2375// FloatingLiteral 2376Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2377Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2378 2379// ImaginaryLiteral 2380Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2381Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2382 2383// StringLiteral 2384Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2385Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2386 2387// ParenExpr 2388Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2389Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2390 2391// UnaryOperator 2392Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2393Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2394 2395// SizeOfAlignOfExpr 2396Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2397 // If this is of a type and the type is a VLA type (and not a typedef), the 2398 // size expression of the VLA needs to be treated as an executable expression. 2399 // Why isn't this weirdness documented better in StmtIterator? 2400 if (isArgumentType()) { 2401 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2402 getArgumentType().getTypePtr())) 2403 return child_iterator(T); 2404 return child_iterator(); 2405 } 2406 return child_iterator(&Argument.Ex); 2407} 2408Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2409 if (isArgumentType()) 2410 return child_iterator(); 2411 return child_iterator(&Argument.Ex + 1); 2412} 2413 2414// ArraySubscriptExpr 2415Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2416 return &SubExprs[0]; 2417} 2418Stmt::child_iterator ArraySubscriptExpr::child_end() { 2419 return &SubExprs[0]+END_EXPR; 2420} 2421 2422// CallExpr 2423Stmt::child_iterator CallExpr::child_begin() { 2424 return &SubExprs[0]; 2425} 2426Stmt::child_iterator CallExpr::child_end() { 2427 return &SubExprs[0]+NumArgs+ARGS_START; 2428} 2429 2430// MemberExpr 2431Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2432Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2433 2434// ExtVectorElementExpr 2435Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2436Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2437 2438// CompoundLiteralExpr 2439Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2440Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2441 2442// CastExpr 2443Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2444Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2445 2446// BinaryOperator 2447Stmt::child_iterator BinaryOperator::child_begin() { 2448 return &SubExprs[0]; 2449} 2450Stmt::child_iterator BinaryOperator::child_end() { 2451 return &SubExprs[0]+END_EXPR; 2452} 2453 2454// ConditionalOperator 2455Stmt::child_iterator ConditionalOperator::child_begin() { 2456 return &SubExprs[0]; 2457} 2458Stmt::child_iterator ConditionalOperator::child_end() { 2459 return &SubExprs[0]+END_EXPR; 2460} 2461 2462// AddrLabelExpr 2463Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2464Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2465 2466// StmtExpr 2467Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2468Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2469 2470// TypesCompatibleExpr 2471Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2472 return child_iterator(); 2473} 2474 2475Stmt::child_iterator TypesCompatibleExpr::child_end() { 2476 return child_iterator(); 2477} 2478 2479// ChooseExpr 2480Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2481Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2482 2483// GNUNullExpr 2484Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2485Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2486 2487// ShuffleVectorExpr 2488Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2489 return &SubExprs[0]; 2490} 2491Stmt::child_iterator ShuffleVectorExpr::child_end() { 2492 return &SubExprs[0]+NumExprs; 2493} 2494 2495// VAArgExpr 2496Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2497Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2498 2499// InitListExpr 2500Stmt::child_iterator InitListExpr::child_begin() { 2501 return InitExprs.size() ? &InitExprs[0] : 0; 2502} 2503Stmt::child_iterator InitListExpr::child_end() { 2504 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2505} 2506 2507// DesignatedInitExpr 2508Stmt::child_iterator DesignatedInitExpr::child_begin() { 2509 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2510 Ptr += sizeof(DesignatedInitExpr); 2511 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2512} 2513Stmt::child_iterator DesignatedInitExpr::child_end() { 2514 return child_iterator(&*child_begin() + NumSubExprs); 2515} 2516 2517// ImplicitValueInitExpr 2518Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2519 return child_iterator(); 2520} 2521 2522Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2523 return child_iterator(); 2524} 2525 2526// ParenListExpr 2527Stmt::child_iterator ParenListExpr::child_begin() { 2528 return &Exprs[0]; 2529} 2530Stmt::child_iterator ParenListExpr::child_end() { 2531 return &Exprs[0]+NumExprs; 2532} 2533 2534// ObjCStringLiteral 2535Stmt::child_iterator ObjCStringLiteral::child_begin() { 2536 return &String; 2537} 2538Stmt::child_iterator ObjCStringLiteral::child_end() { 2539 return &String+1; 2540} 2541 2542// ObjCEncodeExpr 2543Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2544Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2545 2546// ObjCSelectorExpr 2547Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2548 return child_iterator(); 2549} 2550Stmt::child_iterator ObjCSelectorExpr::child_end() { 2551 return child_iterator(); 2552} 2553 2554// ObjCProtocolExpr 2555Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2556 return child_iterator(); 2557} 2558Stmt::child_iterator ObjCProtocolExpr::child_end() { 2559 return child_iterator(); 2560} 2561 2562// ObjCMessageExpr 2563Stmt::child_iterator ObjCMessageExpr::child_begin() { 2564 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2565} 2566Stmt::child_iterator ObjCMessageExpr::child_end() { 2567 return &SubExprs[0]+ARGS_START+getNumArgs(); 2568} 2569 2570// Blocks 2571Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2572Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2573 2574Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2575Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2576