Expr.cpp revision 3a1ce1ed0f5686384e712837bad28c576622e442
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 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 NamedDecl *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 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, ValueDecl *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 ValueDecl *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 case CastExpr::CK_MemberPointerToBoolean: 560 return "MemberPointerToBoolean"; 561 } 562 563 assert(0 && "Unhandled cast kind!"); 564 return 0; 565} 566 567/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 568/// corresponds to, e.g. "<<=". 569const char *BinaryOperator::getOpcodeStr(Opcode Op) { 570 switch (Op) { 571 case PtrMemD: return ".*"; 572 case PtrMemI: return "->*"; 573 case Mul: return "*"; 574 case Div: return "/"; 575 case Rem: return "%"; 576 case Add: return "+"; 577 case Sub: return "-"; 578 case Shl: return "<<"; 579 case Shr: return ">>"; 580 case LT: return "<"; 581 case GT: return ">"; 582 case LE: return "<="; 583 case GE: return ">="; 584 case EQ: return "=="; 585 case NE: return "!="; 586 case And: return "&"; 587 case Xor: return "^"; 588 case Or: return "|"; 589 case LAnd: return "&&"; 590 case LOr: return "||"; 591 case Assign: return "="; 592 case MulAssign: return "*="; 593 case DivAssign: return "/="; 594 case RemAssign: return "%="; 595 case AddAssign: return "+="; 596 case SubAssign: return "-="; 597 case ShlAssign: return "<<="; 598 case ShrAssign: return ">>="; 599 case AndAssign: return "&="; 600 case XorAssign: return "^="; 601 case OrAssign: return "|="; 602 case Comma: return ","; 603 } 604 605 return ""; 606} 607 608BinaryOperator::Opcode 609BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 610 switch (OO) { 611 default: assert(false && "Not an overloadable binary operator"); 612 case OO_Plus: return Add; 613 case OO_Minus: return Sub; 614 case OO_Star: return Mul; 615 case OO_Slash: return Div; 616 case OO_Percent: return Rem; 617 case OO_Caret: return Xor; 618 case OO_Amp: return And; 619 case OO_Pipe: return Or; 620 case OO_Equal: return Assign; 621 case OO_Less: return LT; 622 case OO_Greater: return GT; 623 case OO_PlusEqual: return AddAssign; 624 case OO_MinusEqual: return SubAssign; 625 case OO_StarEqual: return MulAssign; 626 case OO_SlashEqual: return DivAssign; 627 case OO_PercentEqual: return RemAssign; 628 case OO_CaretEqual: return XorAssign; 629 case OO_AmpEqual: return AndAssign; 630 case OO_PipeEqual: return OrAssign; 631 case OO_LessLess: return Shl; 632 case OO_GreaterGreater: return Shr; 633 case OO_LessLessEqual: return ShlAssign; 634 case OO_GreaterGreaterEqual: return ShrAssign; 635 case OO_EqualEqual: return EQ; 636 case OO_ExclaimEqual: return NE; 637 case OO_LessEqual: return LE; 638 case OO_GreaterEqual: return GE; 639 case OO_AmpAmp: return LAnd; 640 case OO_PipePipe: return LOr; 641 case OO_Comma: return Comma; 642 case OO_ArrowStar: return PtrMemI; 643 } 644} 645 646OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 647 static const OverloadedOperatorKind OverOps[] = { 648 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 649 OO_Star, OO_Slash, OO_Percent, 650 OO_Plus, OO_Minus, 651 OO_LessLess, OO_GreaterGreater, 652 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 653 OO_EqualEqual, OO_ExclaimEqual, 654 OO_Amp, 655 OO_Caret, 656 OO_Pipe, 657 OO_AmpAmp, 658 OO_PipePipe, 659 OO_Equal, OO_StarEqual, 660 OO_SlashEqual, OO_PercentEqual, 661 OO_PlusEqual, OO_MinusEqual, 662 OO_LessLessEqual, OO_GreaterGreaterEqual, 663 OO_AmpEqual, OO_CaretEqual, 664 OO_PipeEqual, 665 OO_Comma 666 }; 667 return OverOps[Opc]; 668} 669 670InitListExpr::InitListExpr(SourceLocation lbraceloc, 671 Expr **initExprs, unsigned numInits, 672 SourceLocation rbraceloc) 673 : Expr(InitListExprClass, QualType(), false, false), 674 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 675 UnionFieldInit(0), HadArrayRangeDesignator(false) 676{ 677 for (unsigned I = 0; I != numInits; ++I) { 678 if (initExprs[I]->isTypeDependent()) 679 TypeDependent = true; 680 if (initExprs[I]->isValueDependent()) 681 ValueDependent = true; 682 } 683 684 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 685} 686 687void InitListExpr::reserveInits(unsigned NumInits) { 688 if (NumInits > InitExprs.size()) 689 InitExprs.reserve(NumInits); 690} 691 692void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 693 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 694 Idx < LastIdx; ++Idx) 695 InitExprs[Idx]->Destroy(Context); 696 InitExprs.resize(NumInits, 0); 697} 698 699Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 700 if (Init >= InitExprs.size()) { 701 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 702 InitExprs.back() = expr; 703 return 0; 704 } 705 706 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 707 InitExprs[Init] = expr; 708 return Result; 709} 710 711/// getFunctionType - Return the underlying function type for this block. 712/// 713const FunctionType *BlockExpr::getFunctionType() const { 714 return getType()->getAs<BlockPointerType>()-> 715 getPointeeType()->getAs<FunctionType>(); 716} 717 718SourceLocation BlockExpr::getCaretLocation() const { 719 return TheBlock->getCaretLocation(); 720} 721const Stmt *BlockExpr::getBody() const { 722 return TheBlock->getBody(); 723} 724Stmt *BlockExpr::getBody() { 725 return TheBlock->getBody(); 726} 727 728 729//===----------------------------------------------------------------------===// 730// Generic Expression Routines 731//===----------------------------------------------------------------------===// 732 733/// isUnusedResultAWarning - Return true if this immediate expression should 734/// be warned about if the result is unused. If so, fill in Loc and Ranges 735/// with location to warn on and the source range[s] to report with the 736/// warning. 737bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 738 SourceRange &R2, ASTContext &Ctx) const { 739 // Don't warn if the expr is type dependent. The type could end up 740 // instantiating to void. 741 if (isTypeDependent()) 742 return false; 743 744 switch (getStmtClass()) { 745 default: 746 Loc = getExprLoc(); 747 R1 = getSourceRange(); 748 return true; 749 case ParenExprClass: 750 return cast<ParenExpr>(this)->getSubExpr()-> 751 isUnusedResultAWarning(Loc, R1, R2, Ctx); 752 case UnaryOperatorClass: { 753 const UnaryOperator *UO = cast<UnaryOperator>(this); 754 755 switch (UO->getOpcode()) { 756 default: break; 757 case UnaryOperator::PostInc: 758 case UnaryOperator::PostDec: 759 case UnaryOperator::PreInc: 760 case UnaryOperator::PreDec: // ++/-- 761 return false; // Not a warning. 762 case UnaryOperator::Deref: 763 // Dereferencing a volatile pointer is a side-effect. 764 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 765 return false; 766 break; 767 case UnaryOperator::Real: 768 case UnaryOperator::Imag: 769 // accessing a piece of a volatile complex is a side-effect. 770 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 771 .isVolatileQualified()) 772 return false; 773 break; 774 case UnaryOperator::Extension: 775 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 776 } 777 Loc = UO->getOperatorLoc(); 778 R1 = UO->getSubExpr()->getSourceRange(); 779 return true; 780 } 781 case BinaryOperatorClass: { 782 const BinaryOperator *BO = cast<BinaryOperator>(this); 783 // Consider comma to have side effects if the LHS or RHS does. 784 if (BO->getOpcode() == BinaryOperator::Comma) 785 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 786 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 787 788 if (BO->isAssignmentOp()) 789 return false; 790 Loc = BO->getOperatorLoc(); 791 R1 = BO->getLHS()->getSourceRange(); 792 R2 = BO->getRHS()->getSourceRange(); 793 return true; 794 } 795 case CompoundAssignOperatorClass: 796 return false; 797 798 case ConditionalOperatorClass: { 799 // The condition must be evaluated, but if either the LHS or RHS is a 800 // warning, warn about them. 801 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 802 if (Exp->getLHS() && 803 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 804 return true; 805 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 806 } 807 808 case MemberExprClass: 809 // If the base pointer or element is to a volatile pointer/field, accessing 810 // it is a side effect. 811 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 812 return false; 813 Loc = cast<MemberExpr>(this)->getMemberLoc(); 814 R1 = SourceRange(Loc, Loc); 815 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 816 return true; 817 818 case ArraySubscriptExprClass: 819 // If the base pointer or element is to a volatile pointer/field, accessing 820 // it is a side effect. 821 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 822 return false; 823 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 824 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 825 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 826 return true; 827 828 case CallExprClass: 829 case CXXOperatorCallExprClass: 830 case CXXMemberCallExprClass: { 831 // If this is a direct call, get the callee. 832 const CallExpr *CE = cast<CallExpr>(this); 833 if (const FunctionDecl *FD = CE->getDirectCallee()) { 834 // If the callee has attribute pure, const, or warn_unused_result, warn 835 // about it. void foo() { strlen("bar"); } should warn. 836 // 837 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 838 // updated to match for QoI. 839 if (FD->getAttr<WarnUnusedResultAttr>() || 840 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 841 Loc = CE->getCallee()->getLocStart(); 842 R1 = CE->getCallee()->getSourceRange(); 843 844 if (unsigned NumArgs = CE->getNumArgs()) 845 R2 = SourceRange(CE->getArg(0)->getLocStart(), 846 CE->getArg(NumArgs-1)->getLocEnd()); 847 return true; 848 } 849 } 850 return false; 851 } 852 853 case CXXTemporaryObjectExprClass: 854 case CXXConstructExprClass: 855 return false; 856 857 case ObjCMessageExprClass: 858 return false; 859 860 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 861#if 0 862 const ObjCImplicitSetterGetterRefExpr *Ref = 863 cast<ObjCImplicitSetterGetterRefExpr>(this); 864 // FIXME: We really want the location of the '.' here. 865 Loc = Ref->getLocation(); 866 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 867 if (Ref->getBase()) 868 R2 = Ref->getBase()->getSourceRange(); 869#else 870 Loc = getExprLoc(); 871 R1 = getSourceRange(); 872#endif 873 return true; 874 } 875 case StmtExprClass: { 876 // Statement exprs don't logically have side effects themselves, but are 877 // sometimes used in macros in ways that give them a type that is unused. 878 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 879 // however, if the result of the stmt expr is dead, we don't want to emit a 880 // warning. 881 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 882 if (!CS->body_empty()) 883 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 884 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 885 886 Loc = cast<StmtExpr>(this)->getLParenLoc(); 887 R1 = getSourceRange(); 888 return true; 889 } 890 case CStyleCastExprClass: 891 // If this is an explicit cast to void, allow it. People do this when they 892 // think they know what they're doing :). 893 if (getType()->isVoidType()) 894 return false; 895 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 896 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 897 return true; 898 case CXXFunctionalCastExprClass: { 899 const CastExpr *CE = cast<CastExpr>(this); 900 901 // If this is a cast to void or a constructor conversion, check the operand. 902 // Otherwise, the result of the cast is unused. 903 if (CE->getCastKind() == CastExpr::CK_ToVoid || 904 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 905 return (cast<CastExpr>(this)->getSubExpr() 906 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 907 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 908 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 909 return true; 910 } 911 912 case ImplicitCastExprClass: 913 // Check the operand, since implicit casts are inserted by Sema 914 return (cast<ImplicitCastExpr>(this) 915 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 916 917 case CXXDefaultArgExprClass: 918 return (cast<CXXDefaultArgExpr>(this) 919 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 920 921 case CXXNewExprClass: 922 // FIXME: In theory, there might be new expressions that don't have side 923 // effects (e.g. a placement new with an uninitialized POD). 924 case CXXDeleteExprClass: 925 return false; 926 case CXXBindTemporaryExprClass: 927 return (cast<CXXBindTemporaryExpr>(this) 928 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 929 case CXXExprWithTemporariesClass: 930 return (cast<CXXExprWithTemporaries>(this) 931 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 932 } 933} 934 935/// DeclCanBeLvalue - Determine whether the given declaration can be 936/// an lvalue. This is a helper routine for isLvalue. 937static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 938 // C++ [temp.param]p6: 939 // A non-type non-reference template-parameter is not an lvalue. 940 if (const NonTypeTemplateParmDecl *NTTParm 941 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 942 return NTTParm->getType()->isReferenceType(); 943 944 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 945 // C++ 3.10p2: An lvalue refers to an object or function. 946 (Ctx.getLangOptions().CPlusPlus && 947 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 948} 949 950/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 951/// incomplete type other than void. Nonarray expressions that can be lvalues: 952/// - name, where name must be a variable 953/// - e[i] 954/// - (e), where e must be an lvalue 955/// - e.name, where e must be an lvalue 956/// - e->name 957/// - *e, the type of e cannot be a function type 958/// - string-constant 959/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 960/// - reference type [C++ [expr]] 961/// 962Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 963 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 964 965 isLvalueResult Res = isLvalueInternal(Ctx); 966 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 967 return Res; 968 969 // first, check the type (C99 6.3.2.1). Expressions with function 970 // type in C are not lvalues, but they can be lvalues in C++. 971 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 972 return LV_NotObjectType; 973 974 // Allow qualified void which is an incomplete type other than void (yuck). 975 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 976 return LV_IncompleteVoidType; 977 978 return LV_Valid; 979} 980 981// Check whether the expression can be sanely treated like an l-value 982Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 983 switch (getStmtClass()) { 984 case StringLiteralClass: // C99 6.5.1p4 985 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 986 return LV_Valid; 987 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 988 // For vectors, make sure base is an lvalue (i.e. not a function call). 989 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 990 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 991 return LV_Valid; 992 case DeclRefExprClass: { // C99 6.5.1p2 993 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 994 if (DeclCanBeLvalue(RefdDecl, Ctx)) 995 return LV_Valid; 996 break; 997 } 998 case BlockDeclRefExprClass: { 999 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1000 if (isa<VarDecl>(BDR->getDecl())) 1001 return LV_Valid; 1002 break; 1003 } 1004 case MemberExprClass: { 1005 const MemberExpr *m = cast<MemberExpr>(this); 1006 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1007 NamedDecl *Member = m->getMemberDecl(); 1008 // C++ [expr.ref]p4: 1009 // If E2 is declared to have type "reference to T", then E1.E2 1010 // is an lvalue. 1011 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1012 if (Value->getType()->isReferenceType()) 1013 return LV_Valid; 1014 1015 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1016 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1017 return LV_Valid; 1018 1019 // -- If E2 is a non-static data member [...]. If E1 is an 1020 // lvalue, then E1.E2 is an lvalue. 1021 if (isa<FieldDecl>(Member)) 1022 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1023 1024 // -- If it refers to a static member function [...], then 1025 // E1.E2 is an lvalue. 1026 // -- Otherwise, if E1.E2 refers to a non-static member 1027 // function [...], then E1.E2 is not an lvalue. 1028 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1029 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1030 1031 // -- If E2 is a member enumerator [...], the expression E1.E2 1032 // is not an lvalue. 1033 if (isa<EnumConstantDecl>(Member)) 1034 return LV_InvalidExpression; 1035 1036 // Not an lvalue. 1037 return LV_InvalidExpression; 1038 } 1039 1040 // C99 6.5.2.3p4 1041 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1042 } 1043 case UnaryOperatorClass: 1044 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1045 return LV_Valid; // C99 6.5.3p4 1046 1047 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1048 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1049 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1050 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1051 1052 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1053 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1054 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1055 return LV_Valid; 1056 break; 1057 case ImplicitCastExprClass: 1058 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1059 : LV_InvalidExpression; 1060 case ParenExprClass: // C99 6.5.1p5 1061 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1062 case BinaryOperatorClass: 1063 case CompoundAssignOperatorClass: { 1064 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1065 1066 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1067 BinOp->getOpcode() == BinaryOperator::Comma) 1068 return BinOp->getRHS()->isLvalue(Ctx); 1069 1070 // C++ [expr.mptr.oper]p6 1071 // The result of a .* expression is an lvalue only if its first operand is 1072 // an lvalue and its second operand is a pointer to data member. 1073 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1074 !BinOp->getType()->isFunctionType()) 1075 return BinOp->getLHS()->isLvalue(Ctx); 1076 1077 // The result of an ->* expression is an lvalue only if its second operand 1078 // is a pointer to data member. 1079 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1080 !BinOp->getType()->isFunctionType()) { 1081 QualType Ty = BinOp->getRHS()->getType(); 1082 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1083 return LV_Valid; 1084 } 1085 1086 if (!BinOp->isAssignmentOp()) 1087 return LV_InvalidExpression; 1088 1089 if (Ctx.getLangOptions().CPlusPlus) 1090 // C++ [expr.ass]p1: 1091 // The result of an assignment operation [...] is an lvalue. 1092 return LV_Valid; 1093 1094 1095 // C99 6.5.16: 1096 // An assignment expression [...] is not an lvalue. 1097 return LV_InvalidExpression; 1098 } 1099 case CallExprClass: 1100 case CXXOperatorCallExprClass: 1101 case CXXMemberCallExprClass: { 1102 // C++0x [expr.call]p10 1103 // A function call is an lvalue if and only if the result type 1104 // is an lvalue reference. 1105 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1106 if (ReturnType->isLValueReferenceType()) 1107 return LV_Valid; 1108 1109 break; 1110 } 1111 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1112 return LV_Valid; 1113 case ChooseExprClass: 1114 // __builtin_choose_expr is an lvalue if the selected operand is. 1115 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1116 case ExtVectorElementExprClass: 1117 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1118 return LV_DuplicateVectorComponents; 1119 return LV_Valid; 1120 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1121 return LV_Valid; 1122 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1123 return LV_Valid; 1124 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1125 return LV_Valid; 1126 case PredefinedExprClass: 1127 return LV_Valid; 1128 case UnresolvedLookupExprClass: 1129 return LV_Valid; 1130 case CXXDefaultArgExprClass: 1131 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1132 case CStyleCastExprClass: 1133 case CXXFunctionalCastExprClass: 1134 case CXXStaticCastExprClass: 1135 case CXXDynamicCastExprClass: 1136 case CXXReinterpretCastExprClass: 1137 case CXXConstCastExprClass: 1138 // The result of an explicit cast is an lvalue if the type we are 1139 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1140 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1141 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1142 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1143 isLValueReferenceType()) 1144 return LV_Valid; 1145 break; 1146 case CXXTypeidExprClass: 1147 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1148 return LV_Valid; 1149 case CXXBindTemporaryExprClass: 1150 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1151 isLvalueInternal(Ctx); 1152 case ConditionalOperatorClass: { 1153 // Complicated handling is only for C++. 1154 if (!Ctx.getLangOptions().CPlusPlus) 1155 return LV_InvalidExpression; 1156 1157 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1158 // everywhere there's an object converted to an rvalue. Also, any other 1159 // casts should be wrapped by ImplicitCastExprs. There's just the special 1160 // case involving throws to work out. 1161 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1162 Expr *True = Cond->getTrueExpr(); 1163 Expr *False = Cond->getFalseExpr(); 1164 // C++0x 5.16p2 1165 // If either the second or the third operand has type (cv) void, [...] 1166 // the result [...] is an rvalue. 1167 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1168 return LV_InvalidExpression; 1169 1170 // Both sides must be lvalues for the result to be an lvalue. 1171 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1172 return LV_InvalidExpression; 1173 1174 // That's it. 1175 return LV_Valid; 1176 } 1177 1178 default: 1179 break; 1180 } 1181 return LV_InvalidExpression; 1182} 1183 1184/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1185/// does not have an incomplete type, does not have a const-qualified type, and 1186/// if it is a structure or union, does not have any member (including, 1187/// recursively, any member or element of all contained aggregates or unions) 1188/// with a const-qualified type. 1189Expr::isModifiableLvalueResult 1190Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1191 isLvalueResult lvalResult = isLvalue(Ctx); 1192 1193 switch (lvalResult) { 1194 case LV_Valid: 1195 // C++ 3.10p11: Functions cannot be modified, but pointers to 1196 // functions can be modifiable. 1197 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1198 return MLV_NotObjectType; 1199 break; 1200 1201 case LV_NotObjectType: return MLV_NotObjectType; 1202 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1203 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1204 case LV_InvalidExpression: 1205 // If the top level is a C-style cast, and the subexpression is a valid 1206 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1207 // GCC extension. We don't support it, but we want to produce good 1208 // diagnostics when it happens so that the user knows why. 1209 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1210 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1211 if (Loc) 1212 *Loc = CE->getLParenLoc(); 1213 return MLV_LValueCast; 1214 } 1215 } 1216 return MLV_InvalidExpression; 1217 case LV_MemberFunction: return MLV_MemberFunction; 1218 } 1219 1220 // The following is illegal: 1221 // void takeclosure(void (^C)(void)); 1222 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1223 // 1224 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1225 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1226 return MLV_NotBlockQualified; 1227 } 1228 1229 // Assigning to an 'implicit' property? 1230 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1231 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1232 if (Expr->getSetterMethod() == 0) 1233 return MLV_NoSetterProperty; 1234 } 1235 1236 QualType CT = Ctx.getCanonicalType(getType()); 1237 1238 if (CT.isConstQualified()) 1239 return MLV_ConstQualified; 1240 if (CT->isArrayType()) 1241 return MLV_ArrayType; 1242 if (CT->isIncompleteType()) 1243 return MLV_IncompleteType; 1244 1245 if (const RecordType *r = CT->getAs<RecordType>()) { 1246 if (r->hasConstFields()) 1247 return MLV_ConstQualified; 1248 } 1249 1250 return MLV_Valid; 1251} 1252 1253/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1254/// returns true, if it is; false otherwise. 1255bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1256 switch (getStmtClass()) { 1257 default: 1258 return false; 1259 case ObjCIvarRefExprClass: 1260 return true; 1261 case Expr::UnaryOperatorClass: 1262 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1263 case ParenExprClass: 1264 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1265 case ImplicitCastExprClass: 1266 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1267 case CStyleCastExprClass: 1268 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1269 case DeclRefExprClass: { 1270 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1271 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1272 if (VD->hasGlobalStorage()) 1273 return true; 1274 QualType T = VD->getType(); 1275 // dereferencing to a pointer is always a gc'able candidate, 1276 // unless it is __weak. 1277 return T->isPointerType() && 1278 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1279 } 1280 return false; 1281 } 1282 case MemberExprClass: { 1283 const MemberExpr *M = cast<MemberExpr>(this); 1284 return M->getBase()->isOBJCGCCandidate(Ctx); 1285 } 1286 case ArraySubscriptExprClass: 1287 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1288 } 1289} 1290Expr* Expr::IgnoreParens() { 1291 Expr* E = this; 1292 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1293 E = P->getSubExpr(); 1294 1295 return E; 1296} 1297 1298/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1299/// or CastExprs or ImplicitCastExprs, returning their operand. 1300Expr *Expr::IgnoreParenCasts() { 1301 Expr *E = this; 1302 while (true) { 1303 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1304 E = P->getSubExpr(); 1305 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1306 E = P->getSubExpr(); 1307 else 1308 return E; 1309 } 1310} 1311 1312/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1313/// value (including ptr->int casts of the same size). Strip off any 1314/// ParenExpr or CastExprs, returning their operand. 1315Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1316 Expr *E = this; 1317 while (true) { 1318 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1319 E = P->getSubExpr(); 1320 continue; 1321 } 1322 1323 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1324 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1325 // ptr<->int casts of the same width. We also ignore all identify casts. 1326 Expr *SE = P->getSubExpr(); 1327 1328 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1329 E = SE; 1330 continue; 1331 } 1332 1333 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1334 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1335 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1336 E = SE; 1337 continue; 1338 } 1339 } 1340 1341 return E; 1342 } 1343} 1344 1345 1346/// hasAnyTypeDependentArguments - Determines if any of the expressions 1347/// in Exprs is type-dependent. 1348bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1349 for (unsigned I = 0; I < NumExprs; ++I) 1350 if (Exprs[I]->isTypeDependent()) 1351 return true; 1352 1353 return false; 1354} 1355 1356/// hasAnyValueDependentArguments - Determines if any of the expressions 1357/// in Exprs is value-dependent. 1358bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1359 for (unsigned I = 0; I < NumExprs; ++I) 1360 if (Exprs[I]->isValueDependent()) 1361 return true; 1362 1363 return false; 1364} 1365 1366bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1367 // This function is attempting whether an expression is an initializer 1368 // which can be evaluated at compile-time. isEvaluatable handles most 1369 // of the cases, but it can't deal with some initializer-specific 1370 // expressions, and it can't deal with aggregates; we deal with those here, 1371 // and fall back to isEvaluatable for the other cases. 1372 1373 // FIXME: This function assumes the variable being assigned to 1374 // isn't a reference type! 1375 1376 switch (getStmtClass()) { 1377 default: break; 1378 case StringLiteralClass: 1379 case ObjCStringLiteralClass: 1380 case ObjCEncodeExprClass: 1381 return true; 1382 case CompoundLiteralExprClass: { 1383 // This handles gcc's extension that allows global initializers like 1384 // "struct x {int x;} x = (struct x) {};". 1385 // FIXME: This accepts other cases it shouldn't! 1386 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1387 return Exp->isConstantInitializer(Ctx); 1388 } 1389 case InitListExprClass: { 1390 // FIXME: This doesn't deal with fields with reference types correctly. 1391 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1392 // to bitfields. 1393 const InitListExpr *Exp = cast<InitListExpr>(this); 1394 unsigned numInits = Exp->getNumInits(); 1395 for (unsigned i = 0; i < numInits; i++) { 1396 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1397 return false; 1398 } 1399 return true; 1400 } 1401 case ImplicitValueInitExprClass: 1402 return true; 1403 case ParenExprClass: 1404 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1405 case UnaryOperatorClass: { 1406 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1407 if (Exp->getOpcode() == UnaryOperator::Extension) 1408 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1409 break; 1410 } 1411 case BinaryOperatorClass: { 1412 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1413 // but this handles the common case. 1414 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1415 if (Exp->getOpcode() == BinaryOperator::Sub && 1416 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1417 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1418 return true; 1419 break; 1420 } 1421 case ImplicitCastExprClass: 1422 case CStyleCastExprClass: 1423 // Handle casts with a destination that's a struct or union; this 1424 // deals with both the gcc no-op struct cast extension and the 1425 // cast-to-union extension. 1426 if (getType()->isRecordType()) 1427 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1428 1429 // Integer->integer casts can be handled here, which is important for 1430 // things like (int)(&&x-&&y). Scary but true. 1431 if (getType()->isIntegerType() && 1432 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1433 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1434 1435 break; 1436 } 1437 return isEvaluatable(Ctx); 1438} 1439 1440/// isIntegerConstantExpr - this recursive routine will test if an expression is 1441/// an integer constant expression. 1442 1443/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1444/// comma, etc 1445/// 1446/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1447/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1448/// cast+dereference. 1449 1450// CheckICE - This function does the fundamental ICE checking: the returned 1451// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1452// Note that to reduce code duplication, this helper does no evaluation 1453// itself; the caller checks whether the expression is evaluatable, and 1454// in the rare cases where CheckICE actually cares about the evaluated 1455// value, it calls into Evalute. 1456// 1457// Meanings of Val: 1458// 0: This expression is an ICE if it can be evaluated by Evaluate. 1459// 1: This expression is not an ICE, but if it isn't evaluated, it's 1460// a legal subexpression for an ICE. This return value is used to handle 1461// the comma operator in C99 mode. 1462// 2: This expression is not an ICE, and is not a legal subexpression for one. 1463 1464struct ICEDiag { 1465 unsigned Val; 1466 SourceLocation Loc; 1467 1468 public: 1469 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1470 ICEDiag() : Val(0) {} 1471}; 1472 1473ICEDiag NoDiag() { return ICEDiag(); } 1474 1475static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1476 Expr::EvalResult EVResult; 1477 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1478 !EVResult.Val.isInt()) { 1479 return ICEDiag(2, E->getLocStart()); 1480 } 1481 return NoDiag(); 1482} 1483 1484static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1485 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1486 if (!E->getType()->isIntegralType()) { 1487 return ICEDiag(2, E->getLocStart()); 1488 } 1489 1490 switch (E->getStmtClass()) { 1491#define STMT(Node, Base) case Expr::Node##Class: 1492#define EXPR(Node, Base) 1493#include "clang/AST/StmtNodes.def" 1494 case Expr::PredefinedExprClass: 1495 case Expr::FloatingLiteralClass: 1496 case Expr::ImaginaryLiteralClass: 1497 case Expr::StringLiteralClass: 1498 case Expr::ArraySubscriptExprClass: 1499 case Expr::MemberExprClass: 1500 case Expr::CompoundAssignOperatorClass: 1501 case Expr::CompoundLiteralExprClass: 1502 case Expr::ExtVectorElementExprClass: 1503 case Expr::InitListExprClass: 1504 case Expr::DesignatedInitExprClass: 1505 case Expr::ImplicitValueInitExprClass: 1506 case Expr::ParenListExprClass: 1507 case Expr::VAArgExprClass: 1508 case Expr::AddrLabelExprClass: 1509 case Expr::StmtExprClass: 1510 case Expr::CXXMemberCallExprClass: 1511 case Expr::CXXDynamicCastExprClass: 1512 case Expr::CXXTypeidExprClass: 1513 case Expr::CXXNullPtrLiteralExprClass: 1514 case Expr::CXXThisExprClass: 1515 case Expr::CXXThrowExprClass: 1516 case Expr::CXXNewExprClass: 1517 case Expr::CXXDeleteExprClass: 1518 case Expr::CXXPseudoDestructorExprClass: 1519 case Expr::UnresolvedLookupExprClass: 1520 case Expr::DependentScopeDeclRefExprClass: 1521 case Expr::CXXConstructExprClass: 1522 case Expr::CXXBindTemporaryExprClass: 1523 case Expr::CXXExprWithTemporariesClass: 1524 case Expr::CXXTemporaryObjectExprClass: 1525 case Expr::CXXUnresolvedConstructExprClass: 1526 case Expr::CXXDependentScopeMemberExprClass: 1527 case Expr::UnresolvedMemberExprClass: 1528 case Expr::ObjCStringLiteralClass: 1529 case Expr::ObjCEncodeExprClass: 1530 case Expr::ObjCMessageExprClass: 1531 case Expr::ObjCSelectorExprClass: 1532 case Expr::ObjCProtocolExprClass: 1533 case Expr::ObjCIvarRefExprClass: 1534 case Expr::ObjCPropertyRefExprClass: 1535 case Expr::ObjCImplicitSetterGetterRefExprClass: 1536 case Expr::ObjCSuperExprClass: 1537 case Expr::ObjCIsaExprClass: 1538 case Expr::ShuffleVectorExprClass: 1539 case Expr::BlockExprClass: 1540 case Expr::BlockDeclRefExprClass: 1541 case Expr::NoStmtClass: 1542 case Expr::ExprClass: 1543 return ICEDiag(2, E->getLocStart()); 1544 1545 case Expr::GNUNullExprClass: 1546 // GCC considers the GNU __null value to be an integral constant expression. 1547 return NoDiag(); 1548 1549 case Expr::ParenExprClass: 1550 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1551 case Expr::IntegerLiteralClass: 1552 case Expr::CharacterLiteralClass: 1553 case Expr::CXXBoolLiteralExprClass: 1554 case Expr::CXXZeroInitValueExprClass: 1555 case Expr::TypesCompatibleExprClass: 1556 case Expr::UnaryTypeTraitExprClass: 1557 return NoDiag(); 1558 case Expr::CallExprClass: 1559 case Expr::CXXOperatorCallExprClass: { 1560 const CallExpr *CE = cast<CallExpr>(E); 1561 if (CE->isBuiltinCall(Ctx)) 1562 return CheckEvalInICE(E, Ctx); 1563 return ICEDiag(2, E->getLocStart()); 1564 } 1565 case Expr::DeclRefExprClass: 1566 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1567 return NoDiag(); 1568 if (Ctx.getLangOptions().CPlusPlus && 1569 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1570 // C++ 7.1.5.1p2 1571 // A variable of non-volatile const-qualified integral or enumeration 1572 // type initialized by an ICE can be used in ICEs. 1573 if (const VarDecl *Dcl = 1574 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1575 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1576 if (Quals.hasVolatile() || !Quals.hasConst()) 1577 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1578 1579 // Look for the definition of this variable, which will actually have 1580 // an initializer. 1581 const VarDecl *Def = 0; 1582 const Expr *Init = Dcl->getDefinition(Def); 1583 if (Init) { 1584 if (Def->isInitKnownICE()) { 1585 // We have already checked whether this subexpression is an 1586 // integral constant expression. 1587 if (Def->isInitICE()) 1588 return NoDiag(); 1589 else 1590 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1591 } 1592 1593 // C++ [class.static.data]p4: 1594 // If a static data member is of const integral or const 1595 // enumeration type, its declaration in the class definition can 1596 // specify a constant-initializer which shall be an integral 1597 // constant expression (5.19). In that case, the member can appear 1598 // in integral constant expressions. 1599 if (Def->isOutOfLine()) { 1600 Dcl->setInitKnownICE(false); 1601 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1602 } 1603 1604 if (Dcl->isCheckingICE()) { 1605 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1606 } 1607 1608 Dcl->setCheckingICE(); 1609 ICEDiag Result = CheckICE(Init, Ctx); 1610 // Cache the result of the ICE test. 1611 Dcl->setInitKnownICE(Result.Val == 0); 1612 return Result; 1613 } 1614 } 1615 } 1616 return ICEDiag(2, E->getLocStart()); 1617 case Expr::UnaryOperatorClass: { 1618 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1619 switch (Exp->getOpcode()) { 1620 case UnaryOperator::PostInc: 1621 case UnaryOperator::PostDec: 1622 case UnaryOperator::PreInc: 1623 case UnaryOperator::PreDec: 1624 case UnaryOperator::AddrOf: 1625 case UnaryOperator::Deref: 1626 return ICEDiag(2, E->getLocStart()); 1627 1628 case UnaryOperator::Extension: 1629 case UnaryOperator::LNot: 1630 case UnaryOperator::Plus: 1631 case UnaryOperator::Minus: 1632 case UnaryOperator::Not: 1633 case UnaryOperator::Real: 1634 case UnaryOperator::Imag: 1635 return CheckICE(Exp->getSubExpr(), Ctx); 1636 case UnaryOperator::OffsetOf: 1637 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1638 // Evaluate matches the proposed gcc behavior for cases like 1639 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1640 // compliance: we should warn earlier for offsetof expressions with 1641 // array subscripts that aren't ICEs, and if the array subscripts 1642 // are ICEs, the value of the offsetof must be an integer constant. 1643 return CheckEvalInICE(E, Ctx); 1644 } 1645 } 1646 case Expr::SizeOfAlignOfExprClass: { 1647 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1648 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1649 return ICEDiag(2, E->getLocStart()); 1650 return NoDiag(); 1651 } 1652 case Expr::BinaryOperatorClass: { 1653 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1654 switch (Exp->getOpcode()) { 1655 case BinaryOperator::PtrMemD: 1656 case BinaryOperator::PtrMemI: 1657 case BinaryOperator::Assign: 1658 case BinaryOperator::MulAssign: 1659 case BinaryOperator::DivAssign: 1660 case BinaryOperator::RemAssign: 1661 case BinaryOperator::AddAssign: 1662 case BinaryOperator::SubAssign: 1663 case BinaryOperator::ShlAssign: 1664 case BinaryOperator::ShrAssign: 1665 case BinaryOperator::AndAssign: 1666 case BinaryOperator::XorAssign: 1667 case BinaryOperator::OrAssign: 1668 return ICEDiag(2, E->getLocStart()); 1669 1670 case BinaryOperator::Mul: 1671 case BinaryOperator::Div: 1672 case BinaryOperator::Rem: 1673 case BinaryOperator::Add: 1674 case BinaryOperator::Sub: 1675 case BinaryOperator::Shl: 1676 case BinaryOperator::Shr: 1677 case BinaryOperator::LT: 1678 case BinaryOperator::GT: 1679 case BinaryOperator::LE: 1680 case BinaryOperator::GE: 1681 case BinaryOperator::EQ: 1682 case BinaryOperator::NE: 1683 case BinaryOperator::And: 1684 case BinaryOperator::Xor: 1685 case BinaryOperator::Or: 1686 case BinaryOperator::Comma: { 1687 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1688 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1689 if (Exp->getOpcode() == BinaryOperator::Div || 1690 Exp->getOpcode() == BinaryOperator::Rem) { 1691 // Evaluate gives an error for undefined Div/Rem, so make sure 1692 // we don't evaluate one. 1693 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1694 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1695 if (REval == 0) 1696 return ICEDiag(1, E->getLocStart()); 1697 if (REval.isSigned() && REval.isAllOnesValue()) { 1698 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1699 if (LEval.isMinSignedValue()) 1700 return ICEDiag(1, E->getLocStart()); 1701 } 1702 } 1703 } 1704 if (Exp->getOpcode() == BinaryOperator::Comma) { 1705 if (Ctx.getLangOptions().C99) { 1706 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1707 // if it isn't evaluated. 1708 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1709 return ICEDiag(1, E->getLocStart()); 1710 } else { 1711 // In both C89 and C++, commas in ICEs are illegal. 1712 return ICEDiag(2, E->getLocStart()); 1713 } 1714 } 1715 if (LHSResult.Val >= RHSResult.Val) 1716 return LHSResult; 1717 return RHSResult; 1718 } 1719 case BinaryOperator::LAnd: 1720 case BinaryOperator::LOr: { 1721 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1722 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1723 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1724 // Rare case where the RHS has a comma "side-effect"; we need 1725 // to actually check the condition to see whether the side 1726 // with the comma is evaluated. 1727 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1728 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1729 return RHSResult; 1730 return NoDiag(); 1731 } 1732 1733 if (LHSResult.Val >= RHSResult.Val) 1734 return LHSResult; 1735 return RHSResult; 1736 } 1737 } 1738 } 1739 case Expr::CastExprClass: 1740 case Expr::ImplicitCastExprClass: 1741 case Expr::ExplicitCastExprClass: 1742 case Expr::CStyleCastExprClass: 1743 case Expr::CXXFunctionalCastExprClass: 1744 case Expr::CXXNamedCastExprClass: 1745 case Expr::CXXStaticCastExprClass: 1746 case Expr::CXXReinterpretCastExprClass: 1747 case Expr::CXXConstCastExprClass: { 1748 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1749 if (SubExpr->getType()->isIntegralType()) 1750 return CheckICE(SubExpr, Ctx); 1751 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1752 return NoDiag(); 1753 return ICEDiag(2, E->getLocStart()); 1754 } 1755 case Expr::ConditionalOperatorClass: { 1756 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1757 // If the condition (ignoring parens) is a __builtin_constant_p call, 1758 // then only the true side is actually considered in an integer constant 1759 // expression, and it is fully evaluated. This is an important GNU 1760 // extension. See GCC PR38377 for discussion. 1761 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1762 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1763 Expr::EvalResult EVResult; 1764 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1765 !EVResult.Val.isInt()) { 1766 return ICEDiag(2, E->getLocStart()); 1767 } 1768 return NoDiag(); 1769 } 1770 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1771 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1772 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1773 if (CondResult.Val == 2) 1774 return CondResult; 1775 if (TrueResult.Val == 2) 1776 return TrueResult; 1777 if (FalseResult.Val == 2) 1778 return FalseResult; 1779 if (CondResult.Val == 1) 1780 return CondResult; 1781 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1782 return NoDiag(); 1783 // Rare case where the diagnostics depend on which side is evaluated 1784 // Note that if we get here, CondResult is 0, and at least one of 1785 // TrueResult and FalseResult is non-zero. 1786 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1787 return FalseResult; 1788 } 1789 return TrueResult; 1790 } 1791 case Expr::CXXDefaultArgExprClass: 1792 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1793 case Expr::ChooseExprClass: { 1794 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1795 } 1796 } 1797 1798 // Silence a GCC warning 1799 return ICEDiag(2, E->getLocStart()); 1800} 1801 1802bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1803 SourceLocation *Loc, bool isEvaluated) const { 1804 ICEDiag d = CheckICE(this, Ctx); 1805 if (d.Val != 0) { 1806 if (Loc) *Loc = d.Loc; 1807 return false; 1808 } 1809 EvalResult EvalResult; 1810 if (!Evaluate(EvalResult, Ctx)) 1811 llvm::llvm_unreachable("ICE cannot be evaluated!"); 1812 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1813 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1814 Result = EvalResult.Val.getInt(); 1815 return true; 1816} 1817 1818/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1819/// integer constant expression with the value zero, or if this is one that is 1820/// cast to void*. 1821bool Expr::isNullPointerConstant(ASTContext &Ctx, 1822 NullPointerConstantValueDependence NPC) const { 1823 if (isValueDependent()) { 1824 switch (NPC) { 1825 case NPC_NeverValueDependent: 1826 assert(false && "Unexpected value dependent expression!"); 1827 // If the unthinkable happens, fall through to the safest alternative. 1828 1829 case NPC_ValueDependentIsNull: 1830 return isTypeDependent() || getType()->isIntegralType(); 1831 1832 case NPC_ValueDependentIsNotNull: 1833 return false; 1834 } 1835 } 1836 1837 // Strip off a cast to void*, if it exists. Except in C++. 1838 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1839 if (!Ctx.getLangOptions().CPlusPlus) { 1840 // Check that it is a cast to void*. 1841 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1842 QualType Pointee = PT->getPointeeType(); 1843 if (!Pointee.hasQualifiers() && 1844 Pointee->isVoidType() && // to void* 1845 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1846 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1847 } 1848 } 1849 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1850 // Ignore the ImplicitCastExpr type entirely. 1851 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1852 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1853 // Accept ((void*)0) as a null pointer constant, as many other 1854 // implementations do. 1855 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1856 } else if (const CXXDefaultArgExpr *DefaultArg 1857 = dyn_cast<CXXDefaultArgExpr>(this)) { 1858 // See through default argument expressions 1859 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1860 } else if (isa<GNUNullExpr>(this)) { 1861 // The GNU __null extension is always a null pointer constant. 1862 return true; 1863 } 1864 1865 // C++0x nullptr_t is always a null pointer constant. 1866 if (getType()->isNullPtrType()) 1867 return true; 1868 1869 // This expression must be an integer type. 1870 if (!getType()->isIntegerType() || 1871 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1872 return false; 1873 1874 // If we have an integer constant expression, we need to *evaluate* it and 1875 // test for the value 0. 1876 llvm::APSInt Result; 1877 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1878} 1879 1880FieldDecl *Expr::getBitField() { 1881 Expr *E = this->IgnoreParens(); 1882 1883 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1884 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1885 if (Field->isBitField()) 1886 return Field; 1887 1888 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1889 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1890 return BinOp->getLHS()->getBitField(); 1891 1892 return 0; 1893} 1894 1895/// isArrow - Return true if the base expression is a pointer to vector, 1896/// return false if the base expression is a vector. 1897bool ExtVectorElementExpr::isArrow() const { 1898 return getBase()->getType()->isPointerType(); 1899} 1900 1901unsigned ExtVectorElementExpr::getNumElements() const { 1902 if (const VectorType *VT = getType()->getAs<VectorType>()) 1903 return VT->getNumElements(); 1904 return 1; 1905} 1906 1907/// containsDuplicateElements - Return true if any element access is repeated. 1908bool ExtVectorElementExpr::containsDuplicateElements() const { 1909 // FIXME: Refactor this code to an accessor on the AST node which returns the 1910 // "type" of component access, and share with code below and in Sema. 1911 llvm::StringRef Comp = Accessor->getName(); 1912 1913 // Halving swizzles do not contain duplicate elements. 1914 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1915 return false; 1916 1917 // Advance past s-char prefix on hex swizzles. 1918 if (Comp[0] == 's' || Comp[0] == 'S') 1919 Comp = Comp.substr(1); 1920 1921 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1922 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1923 return true; 1924 1925 return false; 1926} 1927 1928/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1929void ExtVectorElementExpr::getEncodedElementAccess( 1930 llvm::SmallVectorImpl<unsigned> &Elts) const { 1931 llvm::StringRef Comp = Accessor->getName(); 1932 if (Comp[0] == 's' || Comp[0] == 'S') 1933 Comp = Comp.substr(1); 1934 1935 bool isHi = Comp == "hi"; 1936 bool isLo = Comp == "lo"; 1937 bool isEven = Comp == "even"; 1938 bool isOdd = Comp == "odd"; 1939 1940 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1941 uint64_t Index; 1942 1943 if (isHi) 1944 Index = e + i; 1945 else if (isLo) 1946 Index = i; 1947 else if (isEven) 1948 Index = 2 * i; 1949 else if (isOdd) 1950 Index = 2 * i + 1; 1951 else 1952 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1953 1954 Elts.push_back(Index); 1955 } 1956} 1957 1958// constructor for instance messages. 1959ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1960 QualType retType, ObjCMethodDecl *mproto, 1961 SourceLocation LBrac, SourceLocation RBrac, 1962 Expr **ArgExprs, unsigned nargs) 1963 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1964 MethodProto(mproto) { 1965 NumArgs = nargs; 1966 SubExprs = new Stmt*[NumArgs+1]; 1967 SubExprs[RECEIVER] = receiver; 1968 if (NumArgs) { 1969 for (unsigned i = 0; i != NumArgs; ++i) 1970 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1971 } 1972 LBracloc = LBrac; 1973 RBracloc = RBrac; 1974} 1975 1976// constructor for class messages. 1977// FIXME: clsName should be typed to ObjCInterfaceType 1978ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1979 QualType retType, ObjCMethodDecl *mproto, 1980 SourceLocation LBrac, SourceLocation RBrac, 1981 Expr **ArgExprs, unsigned nargs) 1982 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1983 MethodProto(mproto) { 1984 NumArgs = nargs; 1985 SubExprs = new Stmt*[NumArgs+1]; 1986 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1987 if (NumArgs) { 1988 for (unsigned i = 0; i != NumArgs; ++i) 1989 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1990 } 1991 LBracloc = LBrac; 1992 RBracloc = RBrac; 1993} 1994 1995// constructor for class messages. 1996ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 1997 QualType retType, ObjCMethodDecl *mproto, 1998 SourceLocation LBrac, SourceLocation RBrac, 1999 Expr **ArgExprs, unsigned nargs) 2000: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2001MethodProto(mproto) { 2002 NumArgs = nargs; 2003 SubExprs = new Stmt*[NumArgs+1]; 2004 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2005 if (NumArgs) { 2006 for (unsigned i = 0; i != NumArgs; ++i) 2007 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2008 } 2009 LBracloc = LBrac; 2010 RBracloc = RBrac; 2011} 2012 2013ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2014 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2015 switch (x & Flags) { 2016 default: 2017 assert(false && "Invalid ObjCMessageExpr."); 2018 case IsInstMeth: 2019 return ClassInfo(0, 0); 2020 case IsClsMethDeclUnknown: 2021 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2022 case IsClsMethDeclKnown: { 2023 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2024 return ClassInfo(D, D->getIdentifier()); 2025 } 2026 } 2027} 2028 2029void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2030 if (CI.first == 0 && CI.second == 0) 2031 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2032 else if (CI.first == 0) 2033 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2034 else 2035 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2036} 2037 2038 2039bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2040 return getCond()->EvaluateAsInt(C) != 0; 2041} 2042 2043void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2044 unsigned NumExprs) { 2045 if (SubExprs) C.Deallocate(SubExprs); 2046 2047 SubExprs = new (C) Stmt* [NumExprs]; 2048 this->NumExprs = NumExprs; 2049 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2050} 2051 2052void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2053 DestroyChildren(C); 2054 if (SubExprs) C.Deallocate(SubExprs); 2055 this->~ShuffleVectorExpr(); 2056 C.Deallocate(this); 2057} 2058 2059void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2060 // Override default behavior of traversing children. If this has a type 2061 // operand and the type is a variable-length array, the child iteration 2062 // will iterate over the size expression. However, this expression belongs 2063 // to the type, not to this, so we don't want to delete it. 2064 // We still want to delete this expression. 2065 if (isArgumentType()) { 2066 this->~SizeOfAlignOfExpr(); 2067 C.Deallocate(this); 2068 } 2069 else 2070 Expr::DoDestroy(C); 2071} 2072 2073//===----------------------------------------------------------------------===// 2074// DesignatedInitExpr 2075//===----------------------------------------------------------------------===// 2076 2077IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2078 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2079 if (Field.NameOrField & 0x01) 2080 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2081 else 2082 return getField()->getIdentifier(); 2083} 2084 2085DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2086 const Designator *Designators, 2087 SourceLocation EqualOrColonLoc, 2088 bool GNUSyntax, 2089 Expr **IndexExprs, 2090 unsigned NumIndexExprs, 2091 Expr *Init) 2092 : Expr(DesignatedInitExprClass, Ty, 2093 Init->isTypeDependent(), Init->isValueDependent()), 2094 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2095 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2096 this->Designators = new Designator[NumDesignators]; 2097 2098 // Record the initializer itself. 2099 child_iterator Child = child_begin(); 2100 *Child++ = Init; 2101 2102 // Copy the designators and their subexpressions, computing 2103 // value-dependence along the way. 2104 unsigned IndexIdx = 0; 2105 for (unsigned I = 0; I != NumDesignators; ++I) { 2106 this->Designators[I] = Designators[I]; 2107 2108 if (this->Designators[I].isArrayDesignator()) { 2109 // Compute type- and value-dependence. 2110 Expr *Index = IndexExprs[IndexIdx]; 2111 ValueDependent = ValueDependent || 2112 Index->isTypeDependent() || Index->isValueDependent(); 2113 2114 // Copy the index expressions into permanent storage. 2115 *Child++ = IndexExprs[IndexIdx++]; 2116 } else if (this->Designators[I].isArrayRangeDesignator()) { 2117 // Compute type- and value-dependence. 2118 Expr *Start = IndexExprs[IndexIdx]; 2119 Expr *End = IndexExprs[IndexIdx + 1]; 2120 ValueDependent = ValueDependent || 2121 Start->isTypeDependent() || Start->isValueDependent() || 2122 End->isTypeDependent() || End->isValueDependent(); 2123 2124 // Copy the start/end expressions into permanent storage. 2125 *Child++ = IndexExprs[IndexIdx++]; 2126 *Child++ = IndexExprs[IndexIdx++]; 2127 } 2128 } 2129 2130 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2131} 2132 2133DesignatedInitExpr * 2134DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2135 unsigned NumDesignators, 2136 Expr **IndexExprs, unsigned NumIndexExprs, 2137 SourceLocation ColonOrEqualLoc, 2138 bool UsesColonSyntax, Expr *Init) { 2139 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2140 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2141 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2142 ColonOrEqualLoc, UsesColonSyntax, 2143 IndexExprs, NumIndexExprs, Init); 2144} 2145 2146DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2147 unsigned NumIndexExprs) { 2148 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2149 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2150 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2151} 2152 2153void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2154 unsigned NumDesigs) { 2155 if (Designators) 2156 delete [] Designators; 2157 2158 Designators = new Designator[NumDesigs]; 2159 NumDesignators = NumDesigs; 2160 for (unsigned I = 0; I != NumDesigs; ++I) 2161 Designators[I] = Desigs[I]; 2162} 2163 2164SourceRange DesignatedInitExpr::getSourceRange() const { 2165 SourceLocation StartLoc; 2166 Designator &First = 2167 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2168 if (First.isFieldDesignator()) { 2169 if (GNUSyntax) 2170 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2171 else 2172 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2173 } else 2174 StartLoc = 2175 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2176 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2177} 2178 2179Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2180 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2181 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2182 Ptr += sizeof(DesignatedInitExpr); 2183 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2184 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2185} 2186 2187Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2188 assert(D.Kind == Designator::ArrayRangeDesignator && 2189 "Requires array range 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::getArrayRangeEnd(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 + 2)); 2203} 2204 2205/// \brief Replaces the designator at index @p Idx with the series 2206/// of designators in [First, Last). 2207void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2208 const Designator *First, 2209 const Designator *Last) { 2210 unsigned NumNewDesignators = Last - First; 2211 if (NumNewDesignators == 0) { 2212 std::copy_backward(Designators + Idx + 1, 2213 Designators + NumDesignators, 2214 Designators + Idx); 2215 --NumNewDesignators; 2216 return; 2217 } else if (NumNewDesignators == 1) { 2218 Designators[Idx] = *First; 2219 return; 2220 } 2221 2222 Designator *NewDesignators 2223 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2224 std::copy(Designators, Designators + Idx, NewDesignators); 2225 std::copy(First, Last, NewDesignators + Idx); 2226 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2227 NewDesignators + Idx + NumNewDesignators); 2228 delete [] Designators; 2229 Designators = NewDesignators; 2230 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2231} 2232 2233void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2234 delete [] Designators; 2235 Expr::DoDestroy(C); 2236} 2237 2238ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2239 Expr **exprs, unsigned nexprs, 2240 SourceLocation rparenloc) 2241: Expr(ParenListExprClass, QualType(), 2242 hasAnyTypeDependentArguments(exprs, nexprs), 2243 hasAnyValueDependentArguments(exprs, nexprs)), 2244 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2245 2246 Exprs = new (C) Stmt*[nexprs]; 2247 for (unsigned i = 0; i != nexprs; ++i) 2248 Exprs[i] = exprs[i]; 2249} 2250 2251void ParenListExpr::DoDestroy(ASTContext& C) { 2252 DestroyChildren(C); 2253 if (Exprs) C.Deallocate(Exprs); 2254 this->~ParenListExpr(); 2255 C.Deallocate(this); 2256} 2257 2258//===----------------------------------------------------------------------===// 2259// ExprIterator. 2260//===----------------------------------------------------------------------===// 2261 2262Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2263Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2264Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2265const Expr* ConstExprIterator::operator[](size_t idx) const { 2266 return cast<Expr>(I[idx]); 2267} 2268const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2269const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2270 2271//===----------------------------------------------------------------------===// 2272// Child Iterators for iterating over subexpressions/substatements 2273//===----------------------------------------------------------------------===// 2274 2275// DeclRefExpr 2276Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2277Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2278 2279// ObjCIvarRefExpr 2280Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2281Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2282 2283// ObjCPropertyRefExpr 2284Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2285Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2286 2287// ObjCImplicitSetterGetterRefExpr 2288Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2289 return &Base; 2290} 2291Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2292 return &Base+1; 2293} 2294 2295// ObjCSuperExpr 2296Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2297Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2298 2299// ObjCIsaExpr 2300Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2301Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2302 2303// PredefinedExpr 2304Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2305Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2306 2307// IntegerLiteral 2308Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2309Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2310 2311// CharacterLiteral 2312Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2313Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2314 2315// FloatingLiteral 2316Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2317Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2318 2319// ImaginaryLiteral 2320Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2321Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2322 2323// StringLiteral 2324Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2325Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2326 2327// ParenExpr 2328Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2329Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2330 2331// UnaryOperator 2332Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2333Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2334 2335// SizeOfAlignOfExpr 2336Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2337 // If this is of a type and the type is a VLA type (and not a typedef), the 2338 // size expression of the VLA needs to be treated as an executable expression. 2339 // Why isn't this weirdness documented better in StmtIterator? 2340 if (isArgumentType()) { 2341 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2342 getArgumentType().getTypePtr())) 2343 return child_iterator(T); 2344 return child_iterator(); 2345 } 2346 return child_iterator(&Argument.Ex); 2347} 2348Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2349 if (isArgumentType()) 2350 return child_iterator(); 2351 return child_iterator(&Argument.Ex + 1); 2352} 2353 2354// ArraySubscriptExpr 2355Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2356 return &SubExprs[0]; 2357} 2358Stmt::child_iterator ArraySubscriptExpr::child_end() { 2359 return &SubExprs[0]+END_EXPR; 2360} 2361 2362// CallExpr 2363Stmt::child_iterator CallExpr::child_begin() { 2364 return &SubExprs[0]; 2365} 2366Stmt::child_iterator CallExpr::child_end() { 2367 return &SubExprs[0]+NumArgs+ARGS_START; 2368} 2369 2370// MemberExpr 2371Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2372Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2373 2374// ExtVectorElementExpr 2375Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2376Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2377 2378// CompoundLiteralExpr 2379Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2380Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2381 2382// CastExpr 2383Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2384Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2385 2386// BinaryOperator 2387Stmt::child_iterator BinaryOperator::child_begin() { 2388 return &SubExprs[0]; 2389} 2390Stmt::child_iterator BinaryOperator::child_end() { 2391 return &SubExprs[0]+END_EXPR; 2392} 2393 2394// ConditionalOperator 2395Stmt::child_iterator ConditionalOperator::child_begin() { 2396 return &SubExprs[0]; 2397} 2398Stmt::child_iterator ConditionalOperator::child_end() { 2399 return &SubExprs[0]+END_EXPR; 2400} 2401 2402// AddrLabelExpr 2403Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2404Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2405 2406// StmtExpr 2407Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2408Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2409 2410// TypesCompatibleExpr 2411Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2412 return child_iterator(); 2413} 2414 2415Stmt::child_iterator TypesCompatibleExpr::child_end() { 2416 return child_iterator(); 2417} 2418 2419// ChooseExpr 2420Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2421Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2422 2423// GNUNullExpr 2424Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2425Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2426 2427// ShuffleVectorExpr 2428Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2429 return &SubExprs[0]; 2430} 2431Stmt::child_iterator ShuffleVectorExpr::child_end() { 2432 return &SubExprs[0]+NumExprs; 2433} 2434 2435// VAArgExpr 2436Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2437Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2438 2439// InitListExpr 2440Stmt::child_iterator InitListExpr::child_begin() { 2441 return InitExprs.size() ? &InitExprs[0] : 0; 2442} 2443Stmt::child_iterator InitListExpr::child_end() { 2444 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2445} 2446 2447// DesignatedInitExpr 2448Stmt::child_iterator DesignatedInitExpr::child_begin() { 2449 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2450 Ptr += sizeof(DesignatedInitExpr); 2451 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2452} 2453Stmt::child_iterator DesignatedInitExpr::child_end() { 2454 return child_iterator(&*child_begin() + NumSubExprs); 2455} 2456 2457// ImplicitValueInitExpr 2458Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2459 return child_iterator(); 2460} 2461 2462Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2463 return child_iterator(); 2464} 2465 2466// ParenListExpr 2467Stmt::child_iterator ParenListExpr::child_begin() { 2468 return &Exprs[0]; 2469} 2470Stmt::child_iterator ParenListExpr::child_end() { 2471 return &Exprs[0]+NumExprs; 2472} 2473 2474// ObjCStringLiteral 2475Stmt::child_iterator ObjCStringLiteral::child_begin() { 2476 return &String; 2477} 2478Stmt::child_iterator ObjCStringLiteral::child_end() { 2479 return &String+1; 2480} 2481 2482// ObjCEncodeExpr 2483Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2484Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2485 2486// ObjCSelectorExpr 2487Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2488 return child_iterator(); 2489} 2490Stmt::child_iterator ObjCSelectorExpr::child_end() { 2491 return child_iterator(); 2492} 2493 2494// ObjCProtocolExpr 2495Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2496 return child_iterator(); 2497} 2498Stmt::child_iterator ObjCProtocolExpr::child_end() { 2499 return child_iterator(); 2500} 2501 2502// ObjCMessageExpr 2503Stmt::child_iterator ObjCMessageExpr::child_begin() { 2504 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2505} 2506Stmt::child_iterator ObjCMessageExpr::child_end() { 2507 return &SubExprs[0]+ARGS_START+getNumArgs(); 2508} 2509 2510// Blocks 2511Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2512Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2513 2514Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2515Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2516