Expr.cpp revision 0da76df9218d7c27b471b0a4d83a5b29fe24e5b4
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 NamedDecl *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 assert(!isa<OverloadedFunctionDecl>(D)); 122 if (Qualifier) { 123 NameQualifier *NQ = getNameQualifier(); 124 NQ->NNS = Qualifier; 125 NQ->Range = QualifierRange; 126 } 127 128 if (TemplateArgs) 129 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 130 131 computeDependence(); 132} 133 134DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 135 NestedNameSpecifier *Qualifier, 136 SourceRange QualifierRange, 137 NamedDecl *D, 138 SourceLocation NameLoc, 139 QualType T, 140 const TemplateArgumentListInfo *TemplateArgs) { 141 std::size_t Size = sizeof(DeclRefExpr); 142 if (Qualifier != 0) 143 Size += sizeof(NameQualifier); 144 145 if (TemplateArgs) 146 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 147 148 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 149 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 150 TemplateArgs, T); 151} 152 153SourceRange DeclRefExpr::getSourceRange() const { 154 // FIXME: Does not handle multi-token names well, e.g., operator[]. 155 SourceRange R(Loc); 156 157 if (hasQualifier()) 158 R.setBegin(getQualifierRange().getBegin()); 159 if (hasExplicitTemplateArgumentList()) 160 R.setEnd(getRAngleLoc()); 161 return R; 162} 163 164// FIXME: Maybe this should use DeclPrinter with a special "print predefined 165// expr" policy instead. 166std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 167 const Decl *CurrentDecl) { 168 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 169 if (IT != PrettyFunction) 170 return FD->getNameAsString(); 171 172 llvm::SmallString<256> Name; 173 llvm::raw_svector_ostream Out(Name); 174 175 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 176 if (MD->isVirtual()) 177 Out << "virtual "; 178 } 179 180 PrintingPolicy Policy(Context.getLangOptions()); 181 Policy.SuppressTagKind = true; 182 183 std::string Proto = FD->getQualifiedNameAsString(Policy); 184 185 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 186 const FunctionProtoType *FT = 0; 187 if (FD->hasWrittenPrototype()) 188 FT = dyn_cast<FunctionProtoType>(AFT); 189 190 Proto += "("; 191 if (FT) { 192 llvm::raw_string_ostream POut(Proto); 193 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 194 if (i) POut << ", "; 195 std::string Param; 196 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 197 POut << Param; 198 } 199 200 if (FT->isVariadic()) { 201 if (FD->getNumParams()) POut << ", "; 202 POut << "..."; 203 } 204 } 205 Proto += ")"; 206 207 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 401FunctionDecl *CallExpr::getDirectCallee() { 402 Expr *CEE = getCallee()->IgnoreParenCasts(); 403 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 404 return dyn_cast<FunctionDecl>(DRE->getDecl()); 405 406 return 0; 407} 408 409/// setNumArgs - This changes the number of arguments present in this call. 410/// Any orphaned expressions are deleted by this, and any new operands are set 411/// to null. 412void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 413 // No change, just return. 414 if (NumArgs == getNumArgs()) return; 415 416 // If shrinking # arguments, just delete the extras and forgot them. 417 if (NumArgs < getNumArgs()) { 418 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 419 getArg(i)->Destroy(C); 420 this->NumArgs = NumArgs; 421 return; 422 } 423 424 // Otherwise, we are growing the # arguments. New an bigger argument array. 425 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 426 // Copy over args. 427 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 428 NewSubExprs[i] = SubExprs[i]; 429 // Null out new args. 430 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 431 NewSubExprs[i] = 0; 432 433 if (SubExprs) C.Deallocate(SubExprs); 434 SubExprs = NewSubExprs; 435 this->NumArgs = NumArgs; 436} 437 438/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 439/// not, return 0. 440unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 441 // All simple function calls (e.g. func()) are implicitly cast to pointer to 442 // function. As a result, we try and obtain the DeclRefExpr from the 443 // ImplicitCastExpr. 444 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 445 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 446 return 0; 447 448 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 449 if (!DRE) 450 return 0; 451 452 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 453 if (!FDecl) 454 return 0; 455 456 if (!FDecl->getIdentifier()) 457 return 0; 458 459 return FDecl->getBuiltinID(); 460} 461 462QualType CallExpr::getCallReturnType() const { 463 QualType CalleeType = getCallee()->getType(); 464 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 465 CalleeType = FnTypePtr->getPointeeType(); 466 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 467 CalleeType = BPT->getPointeeType(); 468 469 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 470 return FnType->getResultType(); 471} 472 473MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 474 SourceRange qualrange, NamedDecl *memberdecl, 475 SourceLocation l, const TemplateArgumentListInfo *targs, 476 QualType ty) 477 : Expr(MemberExprClass, ty, 478 base->isTypeDependent() || (qual && qual->isDependent()), 479 base->isValueDependent() || (qual && qual->isDependent())), 480 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 481 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(targs) { 482 // Initialize the qualifier, if any. 483 if (HasQualifier) { 484 NameQualifier *NQ = getMemberQualifier(); 485 NQ->NNS = qual; 486 NQ->Range = qualrange; 487 } 488 489 // Initialize the explicit template argument list, if any. 490 if (targs) 491 getExplicitTemplateArgumentList()->initializeFrom(*targs); 492} 493 494MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 495 NestedNameSpecifier *qual, 496 SourceRange qualrange, 497 NamedDecl *memberdecl, 498 SourceLocation l, 499 const TemplateArgumentListInfo *targs, 500 QualType ty) { 501 std::size_t Size = sizeof(MemberExpr); 502 if (qual != 0) 503 Size += sizeof(NameQualifier); 504 505 if (targs) 506 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 507 508 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 509 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 510 targs, ty); 511} 512 513const char *CastExpr::getCastKindName() const { 514 switch (getCastKind()) { 515 case CastExpr::CK_Unknown: 516 return "Unknown"; 517 case CastExpr::CK_BitCast: 518 return "BitCast"; 519 case CastExpr::CK_NoOp: 520 return "NoOp"; 521 case CastExpr::CK_BaseToDerived: 522 return "BaseToDerived"; 523 case CastExpr::CK_DerivedToBase: 524 return "DerivedToBase"; 525 case CastExpr::CK_Dynamic: 526 return "Dynamic"; 527 case CastExpr::CK_ToUnion: 528 return "ToUnion"; 529 case CastExpr::CK_ArrayToPointerDecay: 530 return "ArrayToPointerDecay"; 531 case CastExpr::CK_FunctionToPointerDecay: 532 return "FunctionToPointerDecay"; 533 case CastExpr::CK_NullToMemberPointer: 534 return "NullToMemberPointer"; 535 case CastExpr::CK_BaseToDerivedMemberPointer: 536 return "BaseToDerivedMemberPointer"; 537 case CastExpr::CK_DerivedToBaseMemberPointer: 538 return "DerivedToBaseMemberPointer"; 539 case CastExpr::CK_UserDefinedConversion: 540 return "UserDefinedConversion"; 541 case CastExpr::CK_ConstructorConversion: 542 return "ConstructorConversion"; 543 case CastExpr::CK_IntegralToPointer: 544 return "IntegralToPointer"; 545 case CastExpr::CK_PointerToIntegral: 546 return "PointerToIntegral"; 547 case CastExpr::CK_ToVoid: 548 return "ToVoid"; 549 case CastExpr::CK_VectorSplat: 550 return "VectorSplat"; 551 case CastExpr::CK_IntegralCast: 552 return "IntegralCast"; 553 case CastExpr::CK_IntegralToFloating: 554 return "IntegralToFloating"; 555 case CastExpr::CK_FloatingToIntegral: 556 return "FloatingToIntegral"; 557 case CastExpr::CK_FloatingCast: 558 return "FloatingCast"; 559 } 560 561 assert(0 && "Unhandled cast kind!"); 562 return 0; 563} 564 565/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 566/// corresponds to, e.g. "<<=". 567const char *BinaryOperator::getOpcodeStr(Opcode Op) { 568 switch (Op) { 569 case PtrMemD: return ".*"; 570 case PtrMemI: return "->*"; 571 case Mul: return "*"; 572 case Div: return "/"; 573 case Rem: return "%"; 574 case Add: return "+"; 575 case Sub: return "-"; 576 case Shl: return "<<"; 577 case Shr: return ">>"; 578 case LT: return "<"; 579 case GT: return ">"; 580 case LE: return "<="; 581 case GE: return ">="; 582 case EQ: return "=="; 583 case NE: return "!="; 584 case And: return "&"; 585 case Xor: return "^"; 586 case Or: return "|"; 587 case LAnd: return "&&"; 588 case LOr: return "||"; 589 case Assign: return "="; 590 case MulAssign: return "*="; 591 case DivAssign: return "/="; 592 case RemAssign: return "%="; 593 case AddAssign: return "+="; 594 case SubAssign: return "-="; 595 case ShlAssign: return "<<="; 596 case ShrAssign: return ">>="; 597 case AndAssign: return "&="; 598 case XorAssign: return "^="; 599 case OrAssign: return "|="; 600 case Comma: return ","; 601 } 602 603 return ""; 604} 605 606BinaryOperator::Opcode 607BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 608 switch (OO) { 609 default: assert(false && "Not an overloadable binary operator"); 610 case OO_Plus: return Add; 611 case OO_Minus: return Sub; 612 case OO_Star: return Mul; 613 case OO_Slash: return Div; 614 case OO_Percent: return Rem; 615 case OO_Caret: return Xor; 616 case OO_Amp: return And; 617 case OO_Pipe: return Or; 618 case OO_Equal: return Assign; 619 case OO_Less: return LT; 620 case OO_Greater: return GT; 621 case OO_PlusEqual: return AddAssign; 622 case OO_MinusEqual: return SubAssign; 623 case OO_StarEqual: return MulAssign; 624 case OO_SlashEqual: return DivAssign; 625 case OO_PercentEqual: return RemAssign; 626 case OO_CaretEqual: return XorAssign; 627 case OO_AmpEqual: return AndAssign; 628 case OO_PipeEqual: return OrAssign; 629 case OO_LessLess: return Shl; 630 case OO_GreaterGreater: return Shr; 631 case OO_LessLessEqual: return ShlAssign; 632 case OO_GreaterGreaterEqual: return ShrAssign; 633 case OO_EqualEqual: return EQ; 634 case OO_ExclaimEqual: return NE; 635 case OO_LessEqual: return LE; 636 case OO_GreaterEqual: return GE; 637 case OO_AmpAmp: return LAnd; 638 case OO_PipePipe: return LOr; 639 case OO_Comma: return Comma; 640 case OO_ArrowStar: return PtrMemI; 641 } 642} 643 644OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 645 static const OverloadedOperatorKind OverOps[] = { 646 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 647 OO_Star, OO_Slash, OO_Percent, 648 OO_Plus, OO_Minus, 649 OO_LessLess, OO_GreaterGreater, 650 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 651 OO_EqualEqual, OO_ExclaimEqual, 652 OO_Amp, 653 OO_Caret, 654 OO_Pipe, 655 OO_AmpAmp, 656 OO_PipePipe, 657 OO_Equal, OO_StarEqual, 658 OO_SlashEqual, OO_PercentEqual, 659 OO_PlusEqual, OO_MinusEqual, 660 OO_LessLessEqual, OO_GreaterGreaterEqual, 661 OO_AmpEqual, OO_CaretEqual, 662 OO_PipeEqual, 663 OO_Comma 664 }; 665 return OverOps[Opc]; 666} 667 668InitListExpr::InitListExpr(SourceLocation lbraceloc, 669 Expr **initExprs, unsigned numInits, 670 SourceLocation rbraceloc) 671 : Expr(InitListExprClass, QualType(), false, false), 672 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 673 UnionFieldInit(0), HadArrayRangeDesignator(false) 674{ 675 for (unsigned I = 0; I != numInits; ++I) { 676 if (initExprs[I]->isTypeDependent()) 677 TypeDependent = true; 678 if (initExprs[I]->isValueDependent()) 679 ValueDependent = true; 680 } 681 682 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 683} 684 685void InitListExpr::reserveInits(unsigned NumInits) { 686 if (NumInits > InitExprs.size()) 687 InitExprs.reserve(NumInits); 688} 689 690void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 691 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 692 Idx < LastIdx; ++Idx) 693 InitExprs[Idx]->Destroy(Context); 694 InitExprs.resize(NumInits, 0); 695} 696 697Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 698 if (Init >= InitExprs.size()) { 699 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 700 InitExprs.back() = expr; 701 return 0; 702 } 703 704 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 705 InitExprs[Init] = expr; 706 return Result; 707} 708 709/// getFunctionType - Return the underlying function type for this block. 710/// 711const FunctionType *BlockExpr::getFunctionType() const { 712 return getType()->getAs<BlockPointerType>()-> 713 getPointeeType()->getAs<FunctionType>(); 714} 715 716SourceLocation BlockExpr::getCaretLocation() const { 717 return TheBlock->getCaretLocation(); 718} 719const Stmt *BlockExpr::getBody() const { 720 return TheBlock->getBody(); 721} 722Stmt *BlockExpr::getBody() { 723 return TheBlock->getBody(); 724} 725 726 727//===----------------------------------------------------------------------===// 728// Generic Expression Routines 729//===----------------------------------------------------------------------===// 730 731/// isUnusedResultAWarning - Return true if this immediate expression should 732/// be warned about if the result is unused. If so, fill in Loc and Ranges 733/// with location to warn on and the source range[s] to report with the 734/// warning. 735bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 736 SourceRange &R2, ASTContext &Ctx) const { 737 // Don't warn if the expr is type dependent. The type could end up 738 // instantiating to void. 739 if (isTypeDependent()) 740 return false; 741 742 switch (getStmtClass()) { 743 default: 744 Loc = getExprLoc(); 745 R1 = getSourceRange(); 746 return true; 747 case ParenExprClass: 748 return cast<ParenExpr>(this)->getSubExpr()-> 749 isUnusedResultAWarning(Loc, R1, R2, Ctx); 750 case UnaryOperatorClass: { 751 const UnaryOperator *UO = cast<UnaryOperator>(this); 752 753 switch (UO->getOpcode()) { 754 default: break; 755 case UnaryOperator::PostInc: 756 case UnaryOperator::PostDec: 757 case UnaryOperator::PreInc: 758 case UnaryOperator::PreDec: // ++/-- 759 return false; // Not a warning. 760 case UnaryOperator::Deref: 761 // Dereferencing a volatile pointer is a side-effect. 762 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 763 return false; 764 break; 765 case UnaryOperator::Real: 766 case UnaryOperator::Imag: 767 // accessing a piece of a volatile complex is a side-effect. 768 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 769 .isVolatileQualified()) 770 return false; 771 break; 772 case UnaryOperator::Extension: 773 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 774 } 775 Loc = UO->getOperatorLoc(); 776 R1 = UO->getSubExpr()->getSourceRange(); 777 return true; 778 } 779 case BinaryOperatorClass: { 780 const BinaryOperator *BO = cast<BinaryOperator>(this); 781 // Consider comma to have side effects if the LHS or RHS does. 782 if (BO->getOpcode() == BinaryOperator::Comma) 783 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 784 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 785 786 if (BO->isAssignmentOp()) 787 return false; 788 Loc = BO->getOperatorLoc(); 789 R1 = BO->getLHS()->getSourceRange(); 790 R2 = BO->getRHS()->getSourceRange(); 791 return true; 792 } 793 case CompoundAssignOperatorClass: 794 return false; 795 796 case ConditionalOperatorClass: { 797 // The condition must be evaluated, but if either the LHS or RHS is a 798 // warning, warn about them. 799 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 800 if (Exp->getLHS() && 801 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 802 return true; 803 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 804 } 805 806 case MemberExprClass: 807 // If the base pointer or element is to a volatile pointer/field, accessing 808 // it is a side effect. 809 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 810 return false; 811 Loc = cast<MemberExpr>(this)->getMemberLoc(); 812 R1 = SourceRange(Loc, Loc); 813 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 814 return true; 815 816 case ArraySubscriptExprClass: 817 // If the base pointer or element is to a volatile pointer/field, accessing 818 // it is a side effect. 819 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 820 return false; 821 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 822 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 823 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 824 return true; 825 826 case CallExprClass: 827 case CXXOperatorCallExprClass: 828 case CXXMemberCallExprClass: { 829 // If this is a direct call, get the callee. 830 const CallExpr *CE = cast<CallExpr>(this); 831 if (const FunctionDecl *FD = CE->getDirectCallee()) { 832 // If the callee has attribute pure, const, or warn_unused_result, warn 833 // about it. void foo() { strlen("bar"); } should warn. 834 // 835 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 836 // updated to match for QoI. 837 if (FD->getAttr<WarnUnusedResultAttr>() || 838 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 839 Loc = CE->getCallee()->getLocStart(); 840 R1 = CE->getCallee()->getSourceRange(); 841 842 if (unsigned NumArgs = CE->getNumArgs()) 843 R2 = SourceRange(CE->getArg(0)->getLocStart(), 844 CE->getArg(NumArgs-1)->getLocEnd()); 845 return true; 846 } 847 } 848 return false; 849 } 850 851 case CXXTemporaryObjectExprClass: 852 case CXXConstructExprClass: 853 return false; 854 855 case ObjCMessageExprClass: 856 return false; 857 858 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 859#if 0 860 const ObjCImplicitSetterGetterRefExpr *Ref = 861 cast<ObjCImplicitSetterGetterRefExpr>(this); 862 // FIXME: We really want the location of the '.' here. 863 Loc = Ref->getLocation(); 864 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 865 if (Ref->getBase()) 866 R2 = Ref->getBase()->getSourceRange(); 867#else 868 Loc = getExprLoc(); 869 R1 = getSourceRange(); 870#endif 871 return true; 872 } 873 case StmtExprClass: { 874 // Statement exprs don't logically have side effects themselves, but are 875 // sometimes used in macros in ways that give them a type that is unused. 876 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 877 // however, if the result of the stmt expr is dead, we don't want to emit a 878 // warning. 879 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 880 if (!CS->body_empty()) 881 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 882 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 883 884 Loc = cast<StmtExpr>(this)->getLParenLoc(); 885 R1 = getSourceRange(); 886 return true; 887 } 888 case CStyleCastExprClass: 889 // If this is an explicit cast to void, allow it. People do this when they 890 // think they know what they're doing :). 891 if (getType()->isVoidType()) 892 return false; 893 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 894 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 895 return true; 896 case CXXFunctionalCastExprClass: { 897 const CastExpr *CE = cast<CastExpr>(this); 898 899 // If this is a cast to void or a constructor conversion, check the operand. 900 // Otherwise, the result of the cast is unused. 901 if (CE->getCastKind() == CastExpr::CK_ToVoid || 902 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 903 return (cast<CastExpr>(this)->getSubExpr() 904 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 905 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 906 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 907 return true; 908 } 909 910 case ImplicitCastExprClass: 911 // Check the operand, since implicit casts are inserted by Sema 912 return (cast<ImplicitCastExpr>(this) 913 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 914 915 case CXXDefaultArgExprClass: 916 return (cast<CXXDefaultArgExpr>(this) 917 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 918 919 case CXXNewExprClass: 920 // FIXME: In theory, there might be new expressions that don't have side 921 // effects (e.g. a placement new with an uninitialized POD). 922 case CXXDeleteExprClass: 923 return false; 924 case CXXBindTemporaryExprClass: 925 return (cast<CXXBindTemporaryExpr>(this) 926 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 927 case CXXExprWithTemporariesClass: 928 return (cast<CXXExprWithTemporaries>(this) 929 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 930 } 931} 932 933/// DeclCanBeLvalue - Determine whether the given declaration can be 934/// an lvalue. This is a helper routine for isLvalue. 935static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 936 // C++ [temp.param]p6: 937 // A non-type non-reference template-parameter is not an lvalue. 938 if (const NonTypeTemplateParmDecl *NTTParm 939 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 940 return NTTParm->getType()->isReferenceType(); 941 942 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 943 // C++ 3.10p2: An lvalue refers to an object or function. 944 (Ctx.getLangOptions().CPlusPlus && 945 (isa<FunctionDecl>(Decl) || isa<OverloadedFunctionDecl>(Decl) || 946 isa<FunctionTemplateDecl>(Decl))); 947} 948 949/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 950/// incomplete type other than void. Nonarray expressions that can be lvalues: 951/// - name, where name must be a variable 952/// - e[i] 953/// - (e), where e must be an lvalue 954/// - e.name, where e must be an lvalue 955/// - e->name 956/// - *e, the type of e cannot be a function type 957/// - string-constant 958/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 959/// - reference type [C++ [expr]] 960/// 961Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 962 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 963 964 isLvalueResult Res = isLvalueInternal(Ctx); 965 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 966 return Res; 967 968 // first, check the type (C99 6.3.2.1). Expressions with function 969 // type in C are not lvalues, but they can be lvalues in C++. 970 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 971 return LV_NotObjectType; 972 973 // Allow qualified void which is an incomplete type other than void (yuck). 974 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 975 return LV_IncompleteVoidType; 976 977 return LV_Valid; 978} 979 980// Check whether the expression can be sanely treated like an l-value 981Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 982 switch (getStmtClass()) { 983 case StringLiteralClass: // C99 6.5.1p4 984 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 985 return LV_Valid; 986 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 987 // For vectors, make sure base is an lvalue (i.e. not a function call). 988 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 989 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 990 return LV_Valid; 991 case DeclRefExprClass: { // C99 6.5.1p2 992 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 993 if (DeclCanBeLvalue(RefdDecl, Ctx)) 994 return LV_Valid; 995 break; 996 } 997 case BlockDeclRefExprClass: { 998 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 999 if (isa<VarDecl>(BDR->getDecl())) 1000 return LV_Valid; 1001 break; 1002 } 1003 case MemberExprClass: { 1004 const MemberExpr *m = cast<MemberExpr>(this); 1005 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1006 NamedDecl *Member = m->getMemberDecl(); 1007 // C++ [expr.ref]p4: 1008 // If E2 is declared to have type "reference to T", then E1.E2 1009 // is an lvalue. 1010 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1011 if (Value->getType()->isReferenceType()) 1012 return LV_Valid; 1013 1014 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1015 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1016 return LV_Valid; 1017 1018 // -- If E2 is a non-static data member [...]. If E1 is an 1019 // lvalue, then E1.E2 is an lvalue. 1020 if (isa<FieldDecl>(Member)) 1021 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1022 1023 // -- If it refers to a static member function [...], then 1024 // E1.E2 is an lvalue. 1025 // -- Otherwise, if E1.E2 refers to a non-static member 1026 // function [...], then E1.E2 is not an lvalue. 1027 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1028 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1029 1030 // -- If E2 is a member enumerator [...], the expression E1.E2 1031 // is not an lvalue. 1032 if (isa<EnumConstantDecl>(Member)) 1033 return LV_InvalidExpression; 1034 1035 // Not an lvalue. 1036 return LV_InvalidExpression; 1037 } 1038 1039 // C99 6.5.2.3p4 1040 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1041 } 1042 case UnaryOperatorClass: 1043 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1044 return LV_Valid; // C99 6.5.3p4 1045 1046 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1047 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1048 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1049 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1050 1051 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1052 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1053 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1054 return LV_Valid; 1055 break; 1056 case ImplicitCastExprClass: 1057 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1058 : LV_InvalidExpression; 1059 case ParenExprClass: // C99 6.5.1p5 1060 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1061 case BinaryOperatorClass: 1062 case CompoundAssignOperatorClass: { 1063 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1064 1065 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1066 BinOp->getOpcode() == BinaryOperator::Comma) 1067 return BinOp->getRHS()->isLvalue(Ctx); 1068 1069 // C++ [expr.mptr.oper]p6 1070 // The result of a .* expression is an lvalue only if its first operand is 1071 // an lvalue and its second operand is a pointer to data member. 1072 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1073 !BinOp->getType()->isFunctionType()) 1074 return BinOp->getLHS()->isLvalue(Ctx); 1075 1076 // The result of an ->* expression is an lvalue only if its second operand 1077 // is a pointer to data member. 1078 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1079 !BinOp->getType()->isFunctionType()) { 1080 QualType Ty = BinOp->getRHS()->getType(); 1081 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1082 return LV_Valid; 1083 } 1084 1085 if (!BinOp->isAssignmentOp()) 1086 return LV_InvalidExpression; 1087 1088 if (Ctx.getLangOptions().CPlusPlus) 1089 // C++ [expr.ass]p1: 1090 // The result of an assignment operation [...] is an lvalue. 1091 return LV_Valid; 1092 1093 1094 // C99 6.5.16: 1095 // An assignment expression [...] is not an lvalue. 1096 return LV_InvalidExpression; 1097 } 1098 case CallExprClass: 1099 case CXXOperatorCallExprClass: 1100 case CXXMemberCallExprClass: { 1101 // C++0x [expr.call]p10 1102 // A function call is an lvalue if and only if the result type 1103 // is an lvalue reference. 1104 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1105 if (ReturnType->isLValueReferenceType()) 1106 return LV_Valid; 1107 1108 break; 1109 } 1110 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1111 return LV_Valid; 1112 case ChooseExprClass: 1113 // __builtin_choose_expr is an lvalue if the selected operand is. 1114 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1115 case ExtVectorElementExprClass: 1116 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1117 return LV_DuplicateVectorComponents; 1118 return LV_Valid; 1119 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1120 return LV_Valid; 1121 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1122 return LV_Valid; 1123 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1124 return LV_Valid; 1125 case PredefinedExprClass: 1126 return LV_Valid; 1127 case UnresolvedLookupExprClass: 1128 return LV_Valid; 1129 case CXXDefaultArgExprClass: 1130 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1131 case CXXConditionDeclExprClass: 1132 return LV_Valid; 1133 case CStyleCastExprClass: 1134 case CXXFunctionalCastExprClass: 1135 case CXXStaticCastExprClass: 1136 case CXXDynamicCastExprClass: 1137 case CXXReinterpretCastExprClass: 1138 case CXXConstCastExprClass: 1139 // The result of an explicit cast is an lvalue if the type we are 1140 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1141 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1142 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1143 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1144 isLValueReferenceType()) 1145 return LV_Valid; 1146 break; 1147 case CXXTypeidExprClass: 1148 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1149 return LV_Valid; 1150 case CXXBindTemporaryExprClass: 1151 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1152 isLvalueInternal(Ctx); 1153 case ConditionalOperatorClass: { 1154 // Complicated handling is only for C++. 1155 if (!Ctx.getLangOptions().CPlusPlus) 1156 return LV_InvalidExpression; 1157 1158 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1159 // everywhere there's an object converted to an rvalue. Also, any other 1160 // casts should be wrapped by ImplicitCastExprs. There's just the special 1161 // case involving throws to work out. 1162 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1163 Expr *True = Cond->getTrueExpr(); 1164 Expr *False = Cond->getFalseExpr(); 1165 // C++0x 5.16p2 1166 // If either the second or the third operand has type (cv) void, [...] 1167 // the result [...] is an rvalue. 1168 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1169 return LV_InvalidExpression; 1170 1171 // Both sides must be lvalues for the result to be an lvalue. 1172 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1173 return LV_InvalidExpression; 1174 1175 // That's it. 1176 return LV_Valid; 1177 } 1178 1179 case TemplateIdRefExprClass: { 1180 const TemplateIdRefExpr *TID = cast<TemplateIdRefExpr>(this); 1181 TemplateName Template = TID->getTemplateName(); 1182 NamedDecl *ND = Template.getAsTemplateDecl(); 1183 if (!ND) 1184 ND = Template.getAsOverloadedFunctionDecl(); 1185 if (ND && DeclCanBeLvalue(ND, Ctx)) 1186 return LV_Valid; 1187 1188 break; 1189 } 1190 1191 default: 1192 break; 1193 } 1194 return LV_InvalidExpression; 1195} 1196 1197/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1198/// does not have an incomplete type, does not have a const-qualified type, and 1199/// if it is a structure or union, does not have any member (including, 1200/// recursively, any member or element of all contained aggregates or unions) 1201/// with a const-qualified type. 1202Expr::isModifiableLvalueResult 1203Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1204 isLvalueResult lvalResult = isLvalue(Ctx); 1205 1206 switch (lvalResult) { 1207 case LV_Valid: 1208 // C++ 3.10p11: Functions cannot be modified, but pointers to 1209 // functions can be modifiable. 1210 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1211 return MLV_NotObjectType; 1212 break; 1213 1214 case LV_NotObjectType: return MLV_NotObjectType; 1215 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1216 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1217 case LV_InvalidExpression: 1218 // If the top level is a C-style cast, and the subexpression is a valid 1219 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1220 // GCC extension. We don't support it, but we want to produce good 1221 // diagnostics when it happens so that the user knows why. 1222 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1223 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1224 if (Loc) 1225 *Loc = CE->getLParenLoc(); 1226 return MLV_LValueCast; 1227 } 1228 } 1229 return MLV_InvalidExpression; 1230 case LV_MemberFunction: return MLV_MemberFunction; 1231 } 1232 1233 // The following is illegal: 1234 // void takeclosure(void (^C)(void)); 1235 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1236 // 1237 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1238 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1239 return MLV_NotBlockQualified; 1240 } 1241 1242 // Assigning to an 'implicit' property? 1243 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1244 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1245 if (Expr->getSetterMethod() == 0) 1246 return MLV_NoSetterProperty; 1247 } 1248 1249 QualType CT = Ctx.getCanonicalType(getType()); 1250 1251 if (CT.isConstQualified()) 1252 return MLV_ConstQualified; 1253 if (CT->isArrayType()) 1254 return MLV_ArrayType; 1255 if (CT->isIncompleteType()) 1256 return MLV_IncompleteType; 1257 1258 if (const RecordType *r = CT->getAs<RecordType>()) { 1259 if (r->hasConstFields()) 1260 return MLV_ConstQualified; 1261 } 1262 1263 return MLV_Valid; 1264} 1265 1266/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1267/// returns true, if it is; false otherwise. 1268bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1269 switch (getStmtClass()) { 1270 default: 1271 return false; 1272 case ObjCIvarRefExprClass: 1273 return true; 1274 case Expr::UnaryOperatorClass: 1275 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1276 case ParenExprClass: 1277 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1278 case ImplicitCastExprClass: 1279 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1280 case CStyleCastExprClass: 1281 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1282 case DeclRefExprClass: { 1283 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1284 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1285 if (VD->hasGlobalStorage()) 1286 return true; 1287 QualType T = VD->getType(); 1288 // dereferencing to a pointer is always a gc'able candidate, 1289 // unless it is __weak. 1290 return T->isPointerType() && 1291 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1292 } 1293 return false; 1294 } 1295 case MemberExprClass: { 1296 const MemberExpr *M = cast<MemberExpr>(this); 1297 return M->getBase()->isOBJCGCCandidate(Ctx); 1298 } 1299 case ArraySubscriptExprClass: 1300 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1301 } 1302} 1303Expr* Expr::IgnoreParens() { 1304 Expr* E = this; 1305 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1306 E = P->getSubExpr(); 1307 1308 return E; 1309} 1310 1311/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1312/// or CastExprs or ImplicitCastExprs, returning their operand. 1313Expr *Expr::IgnoreParenCasts() { 1314 Expr *E = this; 1315 while (true) { 1316 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1317 E = P->getSubExpr(); 1318 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1319 E = P->getSubExpr(); 1320 else 1321 return E; 1322 } 1323} 1324 1325/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1326/// value (including ptr->int casts of the same size). Strip off any 1327/// ParenExpr or CastExprs, returning their operand. 1328Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1329 Expr *E = this; 1330 while (true) { 1331 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1332 E = P->getSubExpr(); 1333 continue; 1334 } 1335 1336 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1337 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1338 // ptr<->int casts of the same width. We also ignore all identify casts. 1339 Expr *SE = P->getSubExpr(); 1340 1341 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1342 E = SE; 1343 continue; 1344 } 1345 1346 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1347 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1348 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1349 E = SE; 1350 continue; 1351 } 1352 } 1353 1354 return E; 1355 } 1356} 1357 1358 1359/// hasAnyTypeDependentArguments - Determines if any of the expressions 1360/// in Exprs is type-dependent. 1361bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1362 for (unsigned I = 0; I < NumExprs; ++I) 1363 if (Exprs[I]->isTypeDependent()) 1364 return true; 1365 1366 return false; 1367} 1368 1369/// hasAnyValueDependentArguments - Determines if any of the expressions 1370/// in Exprs is value-dependent. 1371bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1372 for (unsigned I = 0; I < NumExprs; ++I) 1373 if (Exprs[I]->isValueDependent()) 1374 return true; 1375 1376 return false; 1377} 1378 1379bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1380 // This function is attempting whether an expression is an initializer 1381 // which can be evaluated at compile-time. isEvaluatable handles most 1382 // of the cases, but it can't deal with some initializer-specific 1383 // expressions, and it can't deal with aggregates; we deal with those here, 1384 // and fall back to isEvaluatable for the other cases. 1385 1386 // FIXME: This function assumes the variable being assigned to 1387 // isn't a reference type! 1388 1389 switch (getStmtClass()) { 1390 default: break; 1391 case StringLiteralClass: 1392 case ObjCStringLiteralClass: 1393 case ObjCEncodeExprClass: 1394 return true; 1395 case CompoundLiteralExprClass: { 1396 // This handles gcc's extension that allows global initializers like 1397 // "struct x {int x;} x = (struct x) {};". 1398 // FIXME: This accepts other cases it shouldn't! 1399 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1400 return Exp->isConstantInitializer(Ctx); 1401 } 1402 case InitListExprClass: { 1403 // FIXME: This doesn't deal with fields with reference types correctly. 1404 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1405 // to bitfields. 1406 const InitListExpr *Exp = cast<InitListExpr>(this); 1407 unsigned numInits = Exp->getNumInits(); 1408 for (unsigned i = 0; i < numInits; i++) { 1409 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1410 return false; 1411 } 1412 return true; 1413 } 1414 case ImplicitValueInitExprClass: 1415 return true; 1416 case ParenExprClass: 1417 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1418 case UnaryOperatorClass: { 1419 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1420 if (Exp->getOpcode() == UnaryOperator::Extension) 1421 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1422 break; 1423 } 1424 case BinaryOperatorClass: { 1425 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1426 // but this handles the common case. 1427 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1428 if (Exp->getOpcode() == BinaryOperator::Sub && 1429 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1430 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1431 return true; 1432 break; 1433 } 1434 case ImplicitCastExprClass: 1435 case CStyleCastExprClass: 1436 // Handle casts with a destination that's a struct or union; this 1437 // deals with both the gcc no-op struct cast extension and the 1438 // cast-to-union extension. 1439 if (getType()->isRecordType()) 1440 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1441 1442 // Integer->integer casts can be handled here, which is important for 1443 // things like (int)(&&x-&&y). Scary but true. 1444 if (getType()->isIntegerType() && 1445 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1446 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1447 1448 break; 1449 } 1450 return isEvaluatable(Ctx); 1451} 1452 1453/// isIntegerConstantExpr - this recursive routine will test if an expression is 1454/// an integer constant expression. 1455 1456/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1457/// comma, etc 1458/// 1459/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1460/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1461/// cast+dereference. 1462 1463// CheckICE - This function does the fundamental ICE checking: the returned 1464// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1465// Note that to reduce code duplication, this helper does no evaluation 1466// itself; the caller checks whether the expression is evaluatable, and 1467// in the rare cases where CheckICE actually cares about the evaluated 1468// value, it calls into Evalute. 1469// 1470// Meanings of Val: 1471// 0: This expression is an ICE if it can be evaluated by Evaluate. 1472// 1: This expression is not an ICE, but if it isn't evaluated, it's 1473// a legal subexpression for an ICE. This return value is used to handle 1474// the comma operator in C99 mode. 1475// 2: This expression is not an ICE, and is not a legal subexpression for one. 1476 1477struct ICEDiag { 1478 unsigned Val; 1479 SourceLocation Loc; 1480 1481 public: 1482 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1483 ICEDiag() : Val(0) {} 1484}; 1485 1486ICEDiag NoDiag() { return ICEDiag(); } 1487 1488static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1489 Expr::EvalResult EVResult; 1490 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1491 !EVResult.Val.isInt()) { 1492 return ICEDiag(2, E->getLocStart()); 1493 } 1494 return NoDiag(); 1495} 1496 1497static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1498 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1499 if (!E->getType()->isIntegralType()) { 1500 return ICEDiag(2, E->getLocStart()); 1501 } 1502 1503 switch (E->getStmtClass()) { 1504#define STMT(Node, Base) case Expr::Node##Class: 1505#define EXPR(Node, Base) 1506#include "clang/AST/StmtNodes.def" 1507 case Expr::PredefinedExprClass: 1508 case Expr::FloatingLiteralClass: 1509 case Expr::ImaginaryLiteralClass: 1510 case Expr::StringLiteralClass: 1511 case Expr::ArraySubscriptExprClass: 1512 case Expr::MemberExprClass: 1513 case Expr::CompoundAssignOperatorClass: 1514 case Expr::CompoundLiteralExprClass: 1515 case Expr::ExtVectorElementExprClass: 1516 case Expr::InitListExprClass: 1517 case Expr::DesignatedInitExprClass: 1518 case Expr::ImplicitValueInitExprClass: 1519 case Expr::ParenListExprClass: 1520 case Expr::VAArgExprClass: 1521 case Expr::AddrLabelExprClass: 1522 case Expr::StmtExprClass: 1523 case Expr::CXXMemberCallExprClass: 1524 case Expr::CXXDynamicCastExprClass: 1525 case Expr::CXXTypeidExprClass: 1526 case Expr::CXXNullPtrLiteralExprClass: 1527 case Expr::CXXThisExprClass: 1528 case Expr::CXXThrowExprClass: 1529 case Expr::CXXConditionDeclExprClass: // FIXME: is this correct? 1530 case Expr::CXXNewExprClass: 1531 case Expr::CXXDeleteExprClass: 1532 case Expr::CXXPseudoDestructorExprClass: 1533 case Expr::UnresolvedLookupExprClass: 1534 case Expr::DependentScopeDeclRefExprClass: 1535 case Expr::TemplateIdRefExprClass: 1536 case Expr::CXXConstructExprClass: 1537 case Expr::CXXBindTemporaryExprClass: 1538 case Expr::CXXExprWithTemporariesClass: 1539 case Expr::CXXTemporaryObjectExprClass: 1540 case Expr::CXXUnresolvedConstructExprClass: 1541 case Expr::CXXDependentScopeMemberExprClass: 1542 case Expr::ObjCStringLiteralClass: 1543 case Expr::ObjCEncodeExprClass: 1544 case Expr::ObjCMessageExprClass: 1545 case Expr::ObjCSelectorExprClass: 1546 case Expr::ObjCProtocolExprClass: 1547 case Expr::ObjCIvarRefExprClass: 1548 case Expr::ObjCPropertyRefExprClass: 1549 case Expr::ObjCImplicitSetterGetterRefExprClass: 1550 case Expr::ObjCSuperExprClass: 1551 case Expr::ObjCIsaExprClass: 1552 case Expr::ShuffleVectorExprClass: 1553 case Expr::BlockExprClass: 1554 case Expr::BlockDeclRefExprClass: 1555 case Expr::NoStmtClass: 1556 case Expr::ExprClass: 1557 return ICEDiag(2, E->getLocStart()); 1558 1559 case Expr::GNUNullExprClass: 1560 // GCC considers the GNU __null value to be an integral constant expression. 1561 return NoDiag(); 1562 1563 case Expr::ParenExprClass: 1564 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1565 case Expr::IntegerLiteralClass: 1566 case Expr::CharacterLiteralClass: 1567 case Expr::CXXBoolLiteralExprClass: 1568 case Expr::CXXZeroInitValueExprClass: 1569 case Expr::TypesCompatibleExprClass: 1570 case Expr::UnaryTypeTraitExprClass: 1571 return NoDiag(); 1572 case Expr::CallExprClass: 1573 case Expr::CXXOperatorCallExprClass: { 1574 const CallExpr *CE = cast<CallExpr>(E); 1575 if (CE->isBuiltinCall(Ctx)) 1576 return CheckEvalInICE(E, Ctx); 1577 return ICEDiag(2, E->getLocStart()); 1578 } 1579 case Expr::DeclRefExprClass: 1580 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1581 return NoDiag(); 1582 if (Ctx.getLangOptions().CPlusPlus && 1583 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1584 // C++ 7.1.5.1p2 1585 // A variable of non-volatile const-qualified integral or enumeration 1586 // type initialized by an ICE can be used in ICEs. 1587 if (const VarDecl *Dcl = 1588 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1589 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1590 if (Quals.hasVolatile() || !Quals.hasConst()) 1591 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1592 1593 // Look for the definition of this variable, which will actually have 1594 // an initializer. 1595 const VarDecl *Def = 0; 1596 const Expr *Init = Dcl->getDefinition(Def); 1597 if (Init) { 1598 if (Def->isInitKnownICE()) { 1599 // We have already checked whether this subexpression is an 1600 // integral constant expression. 1601 if (Def->isInitICE()) 1602 return NoDiag(); 1603 else 1604 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1605 } 1606 1607 // C++ [class.static.data]p4: 1608 // If a static data member is of const integral or const 1609 // enumeration type, its declaration in the class definition can 1610 // specify a constant-initializer which shall be an integral 1611 // constant expression (5.19). In that case, the member can appear 1612 // in integral constant expressions. 1613 if (Def->isOutOfLine()) { 1614 Dcl->setInitKnownICE(Ctx, false); 1615 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1616 } 1617 1618 ICEDiag Result = CheckICE(Init, Ctx); 1619 // Cache the result of the ICE test. 1620 Dcl->setInitKnownICE(Ctx, Result.Val == 0); 1621 return Result; 1622 } 1623 } 1624 } 1625 return ICEDiag(2, E->getLocStart()); 1626 case Expr::UnaryOperatorClass: { 1627 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1628 switch (Exp->getOpcode()) { 1629 case UnaryOperator::PostInc: 1630 case UnaryOperator::PostDec: 1631 case UnaryOperator::PreInc: 1632 case UnaryOperator::PreDec: 1633 case UnaryOperator::AddrOf: 1634 case UnaryOperator::Deref: 1635 return ICEDiag(2, E->getLocStart()); 1636 1637 case UnaryOperator::Extension: 1638 case UnaryOperator::LNot: 1639 case UnaryOperator::Plus: 1640 case UnaryOperator::Minus: 1641 case UnaryOperator::Not: 1642 case UnaryOperator::Real: 1643 case UnaryOperator::Imag: 1644 return CheckICE(Exp->getSubExpr(), Ctx); 1645 case UnaryOperator::OffsetOf: 1646 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1647 // Evaluate matches the proposed gcc behavior for cases like 1648 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1649 // compliance: we should warn earlier for offsetof expressions with 1650 // array subscripts that aren't ICEs, and if the array subscripts 1651 // are ICEs, the value of the offsetof must be an integer constant. 1652 return CheckEvalInICE(E, Ctx); 1653 } 1654 } 1655 case Expr::SizeOfAlignOfExprClass: { 1656 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1657 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1658 return ICEDiag(2, E->getLocStart()); 1659 return NoDiag(); 1660 } 1661 case Expr::BinaryOperatorClass: { 1662 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1663 switch (Exp->getOpcode()) { 1664 case BinaryOperator::PtrMemD: 1665 case BinaryOperator::PtrMemI: 1666 case BinaryOperator::Assign: 1667 case BinaryOperator::MulAssign: 1668 case BinaryOperator::DivAssign: 1669 case BinaryOperator::RemAssign: 1670 case BinaryOperator::AddAssign: 1671 case BinaryOperator::SubAssign: 1672 case BinaryOperator::ShlAssign: 1673 case BinaryOperator::ShrAssign: 1674 case BinaryOperator::AndAssign: 1675 case BinaryOperator::XorAssign: 1676 case BinaryOperator::OrAssign: 1677 return ICEDiag(2, E->getLocStart()); 1678 1679 case BinaryOperator::Mul: 1680 case BinaryOperator::Div: 1681 case BinaryOperator::Rem: 1682 case BinaryOperator::Add: 1683 case BinaryOperator::Sub: 1684 case BinaryOperator::Shl: 1685 case BinaryOperator::Shr: 1686 case BinaryOperator::LT: 1687 case BinaryOperator::GT: 1688 case BinaryOperator::LE: 1689 case BinaryOperator::GE: 1690 case BinaryOperator::EQ: 1691 case BinaryOperator::NE: 1692 case BinaryOperator::And: 1693 case BinaryOperator::Xor: 1694 case BinaryOperator::Or: 1695 case BinaryOperator::Comma: { 1696 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1697 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1698 if (Exp->getOpcode() == BinaryOperator::Div || 1699 Exp->getOpcode() == BinaryOperator::Rem) { 1700 // Evaluate gives an error for undefined Div/Rem, so make sure 1701 // we don't evaluate one. 1702 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1703 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1704 if (REval == 0) 1705 return ICEDiag(1, E->getLocStart()); 1706 if (REval.isSigned() && REval.isAllOnesValue()) { 1707 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1708 if (LEval.isMinSignedValue()) 1709 return ICEDiag(1, E->getLocStart()); 1710 } 1711 } 1712 } 1713 if (Exp->getOpcode() == BinaryOperator::Comma) { 1714 if (Ctx.getLangOptions().C99) { 1715 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1716 // if it isn't evaluated. 1717 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1718 return ICEDiag(1, E->getLocStart()); 1719 } else { 1720 // In both C89 and C++, commas in ICEs are illegal. 1721 return ICEDiag(2, E->getLocStart()); 1722 } 1723 } 1724 if (LHSResult.Val >= RHSResult.Val) 1725 return LHSResult; 1726 return RHSResult; 1727 } 1728 case BinaryOperator::LAnd: 1729 case BinaryOperator::LOr: { 1730 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1731 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1732 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1733 // Rare case where the RHS has a comma "side-effect"; we need 1734 // to actually check the condition to see whether the side 1735 // with the comma is evaluated. 1736 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1737 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1738 return RHSResult; 1739 return NoDiag(); 1740 } 1741 1742 if (LHSResult.Val >= RHSResult.Val) 1743 return LHSResult; 1744 return RHSResult; 1745 } 1746 } 1747 } 1748 case Expr::CastExprClass: 1749 case Expr::ImplicitCastExprClass: 1750 case Expr::ExplicitCastExprClass: 1751 case Expr::CStyleCastExprClass: 1752 case Expr::CXXFunctionalCastExprClass: 1753 case Expr::CXXNamedCastExprClass: 1754 case Expr::CXXStaticCastExprClass: 1755 case Expr::CXXReinterpretCastExprClass: 1756 case Expr::CXXConstCastExprClass: { 1757 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1758 if (SubExpr->getType()->isIntegralType()) 1759 return CheckICE(SubExpr, Ctx); 1760 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1761 return NoDiag(); 1762 return ICEDiag(2, E->getLocStart()); 1763 } 1764 case Expr::ConditionalOperatorClass: { 1765 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1766 // If the condition (ignoring parens) is a __builtin_constant_p call, 1767 // then only the true side is actually considered in an integer constant 1768 // expression, and it is fully evaluated. This is an important GNU 1769 // extension. See GCC PR38377 for discussion. 1770 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1771 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1772 Expr::EvalResult EVResult; 1773 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1774 !EVResult.Val.isInt()) { 1775 return ICEDiag(2, E->getLocStart()); 1776 } 1777 return NoDiag(); 1778 } 1779 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1780 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1781 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1782 if (CondResult.Val == 2) 1783 return CondResult; 1784 if (TrueResult.Val == 2) 1785 return TrueResult; 1786 if (FalseResult.Val == 2) 1787 return FalseResult; 1788 if (CondResult.Val == 1) 1789 return CondResult; 1790 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1791 return NoDiag(); 1792 // Rare case where the diagnostics depend on which side is evaluated 1793 // Note that if we get here, CondResult is 0, and at least one of 1794 // TrueResult and FalseResult is non-zero. 1795 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1796 return FalseResult; 1797 } 1798 return TrueResult; 1799 } 1800 case Expr::CXXDefaultArgExprClass: 1801 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1802 case Expr::ChooseExprClass: { 1803 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1804 } 1805 } 1806 1807 // Silence a GCC warning 1808 return ICEDiag(2, E->getLocStart()); 1809} 1810 1811bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1812 SourceLocation *Loc, bool isEvaluated) const { 1813 ICEDiag d = CheckICE(this, Ctx); 1814 if (d.Val != 0) { 1815 if (Loc) *Loc = d.Loc; 1816 return false; 1817 } 1818 EvalResult EvalResult; 1819 if (!Evaluate(EvalResult, Ctx)) 1820 llvm::llvm_unreachable("ICE cannot be evaluated!"); 1821 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1822 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1823 Result = EvalResult.Val.getInt(); 1824 return true; 1825} 1826 1827/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1828/// integer constant expression with the value zero, or if this is one that is 1829/// cast to void*. 1830bool Expr::isNullPointerConstant(ASTContext &Ctx, 1831 NullPointerConstantValueDependence NPC) const { 1832 if (isValueDependent()) { 1833 switch (NPC) { 1834 case NPC_NeverValueDependent: 1835 assert(false && "Unexpected value dependent expression!"); 1836 // If the unthinkable happens, fall through to the safest alternative. 1837 1838 case NPC_ValueDependentIsNull: 1839 return isTypeDependent() || getType()->isIntegralType(); 1840 1841 case NPC_ValueDependentIsNotNull: 1842 return false; 1843 } 1844 } 1845 1846 // Strip off a cast to void*, if it exists. Except in C++. 1847 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1848 if (!Ctx.getLangOptions().CPlusPlus) { 1849 // Check that it is a cast to void*. 1850 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1851 QualType Pointee = PT->getPointeeType(); 1852 if (!Pointee.hasQualifiers() && 1853 Pointee->isVoidType() && // to void* 1854 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1855 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1856 } 1857 } 1858 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1859 // Ignore the ImplicitCastExpr type entirely. 1860 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1861 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1862 // Accept ((void*)0) as a null pointer constant, as many other 1863 // implementations do. 1864 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1865 } else if (const CXXDefaultArgExpr *DefaultArg 1866 = dyn_cast<CXXDefaultArgExpr>(this)) { 1867 // See through default argument expressions 1868 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1869 } else if (isa<GNUNullExpr>(this)) { 1870 // The GNU __null extension is always a null pointer constant. 1871 return true; 1872 } 1873 1874 // C++0x nullptr_t is always a null pointer constant. 1875 if (getType()->isNullPtrType()) 1876 return true; 1877 1878 // This expression must be an integer type. 1879 if (!getType()->isIntegerType() || 1880 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1881 return false; 1882 1883 // If we have an integer constant expression, we need to *evaluate* it and 1884 // test for the value 0. 1885 llvm::APSInt Result; 1886 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1887} 1888 1889FieldDecl *Expr::getBitField() { 1890 Expr *E = this->IgnoreParens(); 1891 1892 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1893 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1894 if (Field->isBitField()) 1895 return Field; 1896 1897 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1898 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1899 return BinOp->getLHS()->getBitField(); 1900 1901 return 0; 1902} 1903 1904/// isArrow - Return true if the base expression is a pointer to vector, 1905/// return false if the base expression is a vector. 1906bool ExtVectorElementExpr::isArrow() const { 1907 return getBase()->getType()->isPointerType(); 1908} 1909 1910unsigned ExtVectorElementExpr::getNumElements() const { 1911 if (const VectorType *VT = getType()->getAs<VectorType>()) 1912 return VT->getNumElements(); 1913 return 1; 1914} 1915 1916/// containsDuplicateElements - Return true if any element access is repeated. 1917bool ExtVectorElementExpr::containsDuplicateElements() const { 1918 // FIXME: Refactor this code to an accessor on the AST node which returns the 1919 // "type" of component access, and share with code below and in Sema. 1920 llvm::StringRef Comp = Accessor->getName(); 1921 1922 // Halving swizzles do not contain duplicate elements. 1923 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1924 return false; 1925 1926 // Advance past s-char prefix on hex swizzles. 1927 if (Comp[0] == 's' || Comp[0] == 'S') 1928 Comp = Comp.substr(1); 1929 1930 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1931 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1932 return true; 1933 1934 return false; 1935} 1936 1937/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1938void ExtVectorElementExpr::getEncodedElementAccess( 1939 llvm::SmallVectorImpl<unsigned> &Elts) const { 1940 llvm::StringRef Comp = Accessor->getName(); 1941 if (Comp[0] == 's' || Comp[0] == 'S') 1942 Comp = Comp.substr(1); 1943 1944 bool isHi = Comp == "hi"; 1945 bool isLo = Comp == "lo"; 1946 bool isEven = Comp == "even"; 1947 bool isOdd = Comp == "odd"; 1948 1949 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1950 uint64_t Index; 1951 1952 if (isHi) 1953 Index = e + i; 1954 else if (isLo) 1955 Index = i; 1956 else if (isEven) 1957 Index = 2 * i; 1958 else if (isOdd) 1959 Index = 2 * i + 1; 1960 else 1961 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1962 1963 Elts.push_back(Index); 1964 } 1965} 1966 1967// constructor for instance messages. 1968ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1969 QualType retType, ObjCMethodDecl *mproto, 1970 SourceLocation LBrac, SourceLocation RBrac, 1971 Expr **ArgExprs, unsigned nargs) 1972 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1973 MethodProto(mproto) { 1974 NumArgs = nargs; 1975 SubExprs = new Stmt*[NumArgs+1]; 1976 SubExprs[RECEIVER] = receiver; 1977 if (NumArgs) { 1978 for (unsigned i = 0; i != NumArgs; ++i) 1979 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1980 } 1981 LBracloc = LBrac; 1982 RBracloc = RBrac; 1983} 1984 1985// constructor for class messages. 1986// FIXME: clsName should be typed to ObjCInterfaceType 1987ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1988 QualType retType, ObjCMethodDecl *mproto, 1989 SourceLocation LBrac, SourceLocation RBrac, 1990 Expr **ArgExprs, unsigned nargs) 1991 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1992 MethodProto(mproto) { 1993 NumArgs = nargs; 1994 SubExprs = new Stmt*[NumArgs+1]; 1995 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1996 if (NumArgs) { 1997 for (unsigned i = 0; i != NumArgs; ++i) 1998 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1999 } 2000 LBracloc = LBrac; 2001 RBracloc = RBrac; 2002} 2003 2004// constructor for class messages. 2005ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2006 QualType retType, ObjCMethodDecl *mproto, 2007 SourceLocation LBrac, SourceLocation RBrac, 2008 Expr **ArgExprs, unsigned nargs) 2009: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2010MethodProto(mproto) { 2011 NumArgs = nargs; 2012 SubExprs = new Stmt*[NumArgs+1]; 2013 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2014 if (NumArgs) { 2015 for (unsigned i = 0; i != NumArgs; ++i) 2016 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2017 } 2018 LBracloc = LBrac; 2019 RBracloc = RBrac; 2020} 2021 2022ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2023 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2024 switch (x & Flags) { 2025 default: 2026 assert(false && "Invalid ObjCMessageExpr."); 2027 case IsInstMeth: 2028 return ClassInfo(0, 0); 2029 case IsClsMethDeclUnknown: 2030 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2031 case IsClsMethDeclKnown: { 2032 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2033 return ClassInfo(D, D->getIdentifier()); 2034 } 2035 } 2036} 2037 2038void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2039 if (CI.first == 0 && CI.second == 0) 2040 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2041 else if (CI.first == 0) 2042 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2043 else 2044 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2045} 2046 2047 2048bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2049 return getCond()->EvaluateAsInt(C) != 0; 2050} 2051 2052void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2053 unsigned NumExprs) { 2054 if (SubExprs) C.Deallocate(SubExprs); 2055 2056 SubExprs = new (C) Stmt* [NumExprs]; 2057 this->NumExprs = NumExprs; 2058 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2059} 2060 2061void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2062 DestroyChildren(C); 2063 if (SubExprs) C.Deallocate(SubExprs); 2064 this->~ShuffleVectorExpr(); 2065 C.Deallocate(this); 2066} 2067 2068void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2069 // Override default behavior of traversing children. If this has a type 2070 // operand and the type is a variable-length array, the child iteration 2071 // will iterate over the size expression. However, this expression belongs 2072 // to the type, not to this, so we don't want to delete it. 2073 // We still want to delete this expression. 2074 if (isArgumentType()) { 2075 this->~SizeOfAlignOfExpr(); 2076 C.Deallocate(this); 2077 } 2078 else 2079 Expr::DoDestroy(C); 2080} 2081 2082//===----------------------------------------------------------------------===// 2083// DesignatedInitExpr 2084//===----------------------------------------------------------------------===// 2085 2086IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2087 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2088 if (Field.NameOrField & 0x01) 2089 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2090 else 2091 return getField()->getIdentifier(); 2092} 2093 2094DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2095 const Designator *Designators, 2096 SourceLocation EqualOrColonLoc, 2097 bool GNUSyntax, 2098 Expr **IndexExprs, 2099 unsigned NumIndexExprs, 2100 Expr *Init) 2101 : Expr(DesignatedInitExprClass, Ty, 2102 Init->isTypeDependent(), Init->isValueDependent()), 2103 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2104 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2105 this->Designators = new Designator[NumDesignators]; 2106 2107 // Record the initializer itself. 2108 child_iterator Child = child_begin(); 2109 *Child++ = Init; 2110 2111 // Copy the designators and their subexpressions, computing 2112 // value-dependence along the way. 2113 unsigned IndexIdx = 0; 2114 for (unsigned I = 0; I != NumDesignators; ++I) { 2115 this->Designators[I] = Designators[I]; 2116 2117 if (this->Designators[I].isArrayDesignator()) { 2118 // Compute type- and value-dependence. 2119 Expr *Index = IndexExprs[IndexIdx]; 2120 ValueDependent = ValueDependent || 2121 Index->isTypeDependent() || Index->isValueDependent(); 2122 2123 // Copy the index expressions into permanent storage. 2124 *Child++ = IndexExprs[IndexIdx++]; 2125 } else if (this->Designators[I].isArrayRangeDesignator()) { 2126 // Compute type- and value-dependence. 2127 Expr *Start = IndexExprs[IndexIdx]; 2128 Expr *End = IndexExprs[IndexIdx + 1]; 2129 ValueDependent = ValueDependent || 2130 Start->isTypeDependent() || Start->isValueDependent() || 2131 End->isTypeDependent() || End->isValueDependent(); 2132 2133 // Copy the start/end expressions into permanent storage. 2134 *Child++ = IndexExprs[IndexIdx++]; 2135 *Child++ = IndexExprs[IndexIdx++]; 2136 } 2137 } 2138 2139 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2140} 2141 2142DesignatedInitExpr * 2143DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2144 unsigned NumDesignators, 2145 Expr **IndexExprs, unsigned NumIndexExprs, 2146 SourceLocation ColonOrEqualLoc, 2147 bool UsesColonSyntax, Expr *Init) { 2148 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2149 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2150 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2151 ColonOrEqualLoc, UsesColonSyntax, 2152 IndexExprs, NumIndexExprs, Init); 2153} 2154 2155DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2156 unsigned NumIndexExprs) { 2157 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2158 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2159 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2160} 2161 2162void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2163 unsigned NumDesigs) { 2164 if (Designators) 2165 delete [] Designators; 2166 2167 Designators = new Designator[NumDesigs]; 2168 NumDesignators = NumDesigs; 2169 for (unsigned I = 0; I != NumDesigs; ++I) 2170 Designators[I] = Desigs[I]; 2171} 2172 2173SourceRange DesignatedInitExpr::getSourceRange() const { 2174 SourceLocation StartLoc; 2175 Designator &First = 2176 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2177 if (First.isFieldDesignator()) { 2178 if (GNUSyntax) 2179 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2180 else 2181 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2182 } else 2183 StartLoc = 2184 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2185 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2186} 2187 2188Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2189 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2190 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2191 Ptr += sizeof(DesignatedInitExpr); 2192 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2193 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2194} 2195 2196Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2197 assert(D.Kind == Designator::ArrayRangeDesignator && 2198 "Requires array range designator"); 2199 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2200 Ptr += sizeof(DesignatedInitExpr); 2201 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2202 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2203} 2204 2205Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2206 assert(D.Kind == Designator::ArrayRangeDesignator && 2207 "Requires array range designator"); 2208 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2209 Ptr += sizeof(DesignatedInitExpr); 2210 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2211 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2212} 2213 2214/// \brief Replaces the designator at index @p Idx with the series 2215/// of designators in [First, Last). 2216void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2217 const Designator *First, 2218 const Designator *Last) { 2219 unsigned NumNewDesignators = Last - First; 2220 if (NumNewDesignators == 0) { 2221 std::copy_backward(Designators + Idx + 1, 2222 Designators + NumDesignators, 2223 Designators + Idx); 2224 --NumNewDesignators; 2225 return; 2226 } else if (NumNewDesignators == 1) { 2227 Designators[Idx] = *First; 2228 return; 2229 } 2230 2231 Designator *NewDesignators 2232 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2233 std::copy(Designators, Designators + Idx, NewDesignators); 2234 std::copy(First, Last, NewDesignators + Idx); 2235 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2236 NewDesignators + Idx + NumNewDesignators); 2237 delete [] Designators; 2238 Designators = NewDesignators; 2239 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2240} 2241 2242void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2243 delete [] Designators; 2244 Expr::DoDestroy(C); 2245} 2246 2247ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2248 Expr **exprs, unsigned nexprs, 2249 SourceLocation rparenloc) 2250: Expr(ParenListExprClass, QualType(), 2251 hasAnyTypeDependentArguments(exprs, nexprs), 2252 hasAnyValueDependentArguments(exprs, nexprs)), 2253 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2254 2255 Exprs = new (C) Stmt*[nexprs]; 2256 for (unsigned i = 0; i != nexprs; ++i) 2257 Exprs[i] = exprs[i]; 2258} 2259 2260void ParenListExpr::DoDestroy(ASTContext& C) { 2261 DestroyChildren(C); 2262 if (Exprs) C.Deallocate(Exprs); 2263 this->~ParenListExpr(); 2264 C.Deallocate(this); 2265} 2266 2267//===----------------------------------------------------------------------===// 2268// ExprIterator. 2269//===----------------------------------------------------------------------===// 2270 2271Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2272Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2273Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2274const Expr* ConstExprIterator::operator[](size_t idx) const { 2275 return cast<Expr>(I[idx]); 2276} 2277const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2278const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2279 2280//===----------------------------------------------------------------------===// 2281// Child Iterators for iterating over subexpressions/substatements 2282//===----------------------------------------------------------------------===// 2283 2284// DeclRefExpr 2285Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2286Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2287 2288// ObjCIvarRefExpr 2289Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2290Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2291 2292// ObjCPropertyRefExpr 2293Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2294Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2295 2296// ObjCImplicitSetterGetterRefExpr 2297Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2298 return &Base; 2299} 2300Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2301 return &Base+1; 2302} 2303 2304// ObjCSuperExpr 2305Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2306Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2307 2308// ObjCIsaExpr 2309Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2310Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2311 2312// PredefinedExpr 2313Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2314Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2315 2316// IntegerLiteral 2317Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2318Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2319 2320// CharacterLiteral 2321Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2322Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2323 2324// FloatingLiteral 2325Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2326Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2327 2328// ImaginaryLiteral 2329Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2330Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2331 2332// StringLiteral 2333Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2334Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2335 2336// ParenExpr 2337Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2338Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2339 2340// UnaryOperator 2341Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2342Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2343 2344// SizeOfAlignOfExpr 2345Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2346 // If this is of a type and the type is a VLA type (and not a typedef), the 2347 // size expression of the VLA needs to be treated as an executable expression. 2348 // Why isn't this weirdness documented better in StmtIterator? 2349 if (isArgumentType()) { 2350 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2351 getArgumentType().getTypePtr())) 2352 return child_iterator(T); 2353 return child_iterator(); 2354 } 2355 return child_iterator(&Argument.Ex); 2356} 2357Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2358 if (isArgumentType()) 2359 return child_iterator(); 2360 return child_iterator(&Argument.Ex + 1); 2361} 2362 2363// ArraySubscriptExpr 2364Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2365 return &SubExprs[0]; 2366} 2367Stmt::child_iterator ArraySubscriptExpr::child_end() { 2368 return &SubExprs[0]+END_EXPR; 2369} 2370 2371// CallExpr 2372Stmt::child_iterator CallExpr::child_begin() { 2373 return &SubExprs[0]; 2374} 2375Stmt::child_iterator CallExpr::child_end() { 2376 return &SubExprs[0]+NumArgs+ARGS_START; 2377} 2378 2379// MemberExpr 2380Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2381Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2382 2383// ExtVectorElementExpr 2384Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2385Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2386 2387// CompoundLiteralExpr 2388Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2389Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2390 2391// CastExpr 2392Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2393Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2394 2395// BinaryOperator 2396Stmt::child_iterator BinaryOperator::child_begin() { 2397 return &SubExprs[0]; 2398} 2399Stmt::child_iterator BinaryOperator::child_end() { 2400 return &SubExprs[0]+END_EXPR; 2401} 2402 2403// ConditionalOperator 2404Stmt::child_iterator ConditionalOperator::child_begin() { 2405 return &SubExprs[0]; 2406} 2407Stmt::child_iterator ConditionalOperator::child_end() { 2408 return &SubExprs[0]+END_EXPR; 2409} 2410 2411// AddrLabelExpr 2412Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2413Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2414 2415// StmtExpr 2416Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2417Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2418 2419// TypesCompatibleExpr 2420Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2421 return child_iterator(); 2422} 2423 2424Stmt::child_iterator TypesCompatibleExpr::child_end() { 2425 return child_iterator(); 2426} 2427 2428// ChooseExpr 2429Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2430Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2431 2432// GNUNullExpr 2433Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2434Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2435 2436// ShuffleVectorExpr 2437Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2438 return &SubExprs[0]; 2439} 2440Stmt::child_iterator ShuffleVectorExpr::child_end() { 2441 return &SubExprs[0]+NumExprs; 2442} 2443 2444// VAArgExpr 2445Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2446Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2447 2448// InitListExpr 2449Stmt::child_iterator InitListExpr::child_begin() { 2450 return InitExprs.size() ? &InitExprs[0] : 0; 2451} 2452Stmt::child_iterator InitListExpr::child_end() { 2453 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2454} 2455 2456// DesignatedInitExpr 2457Stmt::child_iterator DesignatedInitExpr::child_begin() { 2458 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2459 Ptr += sizeof(DesignatedInitExpr); 2460 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2461} 2462Stmt::child_iterator DesignatedInitExpr::child_end() { 2463 return child_iterator(&*child_begin() + NumSubExprs); 2464} 2465 2466// ImplicitValueInitExpr 2467Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2468 return child_iterator(); 2469} 2470 2471Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2472 return child_iterator(); 2473} 2474 2475// ParenListExpr 2476Stmt::child_iterator ParenListExpr::child_begin() { 2477 return &Exprs[0]; 2478} 2479Stmt::child_iterator ParenListExpr::child_end() { 2480 return &Exprs[0]+NumExprs; 2481} 2482 2483// ObjCStringLiteral 2484Stmt::child_iterator ObjCStringLiteral::child_begin() { 2485 return &String; 2486} 2487Stmt::child_iterator ObjCStringLiteral::child_end() { 2488 return &String+1; 2489} 2490 2491// ObjCEncodeExpr 2492Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2493Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2494 2495// ObjCSelectorExpr 2496Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2497 return child_iterator(); 2498} 2499Stmt::child_iterator ObjCSelectorExpr::child_end() { 2500 return child_iterator(); 2501} 2502 2503// ObjCProtocolExpr 2504Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2505 return child_iterator(); 2506} 2507Stmt::child_iterator ObjCProtocolExpr::child_end() { 2508 return child_iterator(); 2509} 2510 2511// ObjCMessageExpr 2512Stmt::child_iterator ObjCMessageExpr::child_begin() { 2513 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2514} 2515Stmt::child_iterator ObjCMessageExpr::child_end() { 2516 return &SubExprs[0]+ARGS_START+getNumArgs(); 2517} 2518 2519// Blocks 2520Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2521Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2522 2523Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2524Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2525