Expr.cpp revision 199990
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 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<OverloadedFunctionDecl>(Decl) || 948 isa<FunctionTemplateDecl>(Decl))); 949} 950 951/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 952/// incomplete type other than void. Nonarray expressions that can be lvalues: 953/// - name, where name must be a variable 954/// - e[i] 955/// - (e), where e must be an lvalue 956/// - e.name, where e must be an lvalue 957/// - e->name 958/// - *e, the type of e cannot be a function type 959/// - string-constant 960/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 961/// - reference type [C++ [expr]] 962/// 963Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 964 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 965 966 isLvalueResult Res = isLvalueInternal(Ctx); 967 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 968 return Res; 969 970 // first, check the type (C99 6.3.2.1). Expressions with function 971 // type in C are not lvalues, but they can be lvalues in C++. 972 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 973 return LV_NotObjectType; 974 975 // Allow qualified void which is an incomplete type other than void (yuck). 976 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 977 return LV_IncompleteVoidType; 978 979 return LV_Valid; 980} 981 982// Check whether the expression can be sanely treated like an l-value 983Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 984 switch (getStmtClass()) { 985 case StringLiteralClass: // C99 6.5.1p4 986 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 987 return LV_Valid; 988 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 989 // For vectors, make sure base is an lvalue (i.e. not a function call). 990 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 991 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 992 return LV_Valid; 993 case DeclRefExprClass: { // C99 6.5.1p2 994 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 995 if (DeclCanBeLvalue(RefdDecl, Ctx)) 996 return LV_Valid; 997 break; 998 } 999 case BlockDeclRefExprClass: { 1000 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1001 if (isa<VarDecl>(BDR->getDecl())) 1002 return LV_Valid; 1003 break; 1004 } 1005 case MemberExprClass: { 1006 const MemberExpr *m = cast<MemberExpr>(this); 1007 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1008 NamedDecl *Member = m->getMemberDecl(); 1009 // C++ [expr.ref]p4: 1010 // If E2 is declared to have type "reference to T", then E1.E2 1011 // is an lvalue. 1012 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1013 if (Value->getType()->isReferenceType()) 1014 return LV_Valid; 1015 1016 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1017 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1018 return LV_Valid; 1019 1020 // -- If E2 is a non-static data member [...]. If E1 is an 1021 // lvalue, then E1.E2 is an lvalue. 1022 if (isa<FieldDecl>(Member)) 1023 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1024 1025 // -- If it refers to a static member function [...], then 1026 // E1.E2 is an lvalue. 1027 // -- Otherwise, if E1.E2 refers to a non-static member 1028 // function [...], then E1.E2 is not an lvalue. 1029 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1030 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1031 1032 // -- If E2 is a member enumerator [...], the expression E1.E2 1033 // is not an lvalue. 1034 if (isa<EnumConstantDecl>(Member)) 1035 return LV_InvalidExpression; 1036 1037 // Not an lvalue. 1038 return LV_InvalidExpression; 1039 } 1040 1041 // C99 6.5.2.3p4 1042 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1043 } 1044 case UnaryOperatorClass: 1045 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1046 return LV_Valid; // C99 6.5.3p4 1047 1048 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1049 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1050 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1051 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1052 1053 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1054 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1055 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1056 return LV_Valid; 1057 break; 1058 case ImplicitCastExprClass: 1059 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1060 : LV_InvalidExpression; 1061 case ParenExprClass: // C99 6.5.1p5 1062 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1063 case BinaryOperatorClass: 1064 case CompoundAssignOperatorClass: { 1065 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1066 1067 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1068 BinOp->getOpcode() == BinaryOperator::Comma) 1069 return BinOp->getRHS()->isLvalue(Ctx); 1070 1071 // C++ [expr.mptr.oper]p6 1072 // The result of a .* expression is an lvalue only if its first operand is 1073 // an lvalue and its second operand is a pointer to data member. 1074 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1075 !BinOp->getType()->isFunctionType()) 1076 return BinOp->getLHS()->isLvalue(Ctx); 1077 1078 // The result of an ->* expression is an lvalue only if its second operand 1079 // is a pointer to data member. 1080 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1081 !BinOp->getType()->isFunctionType()) { 1082 QualType Ty = BinOp->getRHS()->getType(); 1083 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1084 return LV_Valid; 1085 } 1086 1087 if (!BinOp->isAssignmentOp()) 1088 return LV_InvalidExpression; 1089 1090 if (Ctx.getLangOptions().CPlusPlus) 1091 // C++ [expr.ass]p1: 1092 // The result of an assignment operation [...] is an lvalue. 1093 return LV_Valid; 1094 1095 1096 // C99 6.5.16: 1097 // An assignment expression [...] is not an lvalue. 1098 return LV_InvalidExpression; 1099 } 1100 case CallExprClass: 1101 case CXXOperatorCallExprClass: 1102 case CXXMemberCallExprClass: { 1103 // C++0x [expr.call]p10 1104 // A function call is an lvalue if and only if the result type 1105 // is an lvalue reference. 1106 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1107 if (ReturnType->isLValueReferenceType()) 1108 return LV_Valid; 1109 1110 break; 1111 } 1112 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1113 return LV_Valid; 1114 case ChooseExprClass: 1115 // __builtin_choose_expr is an lvalue if the selected operand is. 1116 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1117 case ExtVectorElementExprClass: 1118 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1119 return LV_DuplicateVectorComponents; 1120 return LV_Valid; 1121 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1122 return LV_Valid; 1123 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1124 return LV_Valid; 1125 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1126 return LV_Valid; 1127 case PredefinedExprClass: 1128 return LV_Valid; 1129 case UnresolvedLookupExprClass: 1130 return LV_Valid; 1131 case CXXDefaultArgExprClass: 1132 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 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 default: 1180 break; 1181 } 1182 return LV_InvalidExpression; 1183} 1184 1185/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1186/// does not have an incomplete type, does not have a const-qualified type, and 1187/// if it is a structure or union, does not have any member (including, 1188/// recursively, any member or element of all contained aggregates or unions) 1189/// with a const-qualified type. 1190Expr::isModifiableLvalueResult 1191Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1192 isLvalueResult lvalResult = isLvalue(Ctx); 1193 1194 switch (lvalResult) { 1195 case LV_Valid: 1196 // C++ 3.10p11: Functions cannot be modified, but pointers to 1197 // functions can be modifiable. 1198 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1199 return MLV_NotObjectType; 1200 break; 1201 1202 case LV_NotObjectType: return MLV_NotObjectType; 1203 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1204 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1205 case LV_InvalidExpression: 1206 // If the top level is a C-style cast, and the subexpression is a valid 1207 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1208 // GCC extension. We don't support it, but we want to produce good 1209 // diagnostics when it happens so that the user knows why. 1210 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1211 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1212 if (Loc) 1213 *Loc = CE->getLParenLoc(); 1214 return MLV_LValueCast; 1215 } 1216 } 1217 return MLV_InvalidExpression; 1218 case LV_MemberFunction: return MLV_MemberFunction; 1219 } 1220 1221 // The following is illegal: 1222 // void takeclosure(void (^C)(void)); 1223 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1224 // 1225 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1226 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1227 return MLV_NotBlockQualified; 1228 } 1229 1230 // Assigning to an 'implicit' property? 1231 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1232 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1233 if (Expr->getSetterMethod() == 0) 1234 return MLV_NoSetterProperty; 1235 } 1236 1237 QualType CT = Ctx.getCanonicalType(getType()); 1238 1239 if (CT.isConstQualified()) 1240 return MLV_ConstQualified; 1241 if (CT->isArrayType()) 1242 return MLV_ArrayType; 1243 if (CT->isIncompleteType()) 1244 return MLV_IncompleteType; 1245 1246 if (const RecordType *r = CT->getAs<RecordType>()) { 1247 if (r->hasConstFields()) 1248 return MLV_ConstQualified; 1249 } 1250 1251 return MLV_Valid; 1252} 1253 1254/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1255/// returns true, if it is; false otherwise. 1256bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1257 switch (getStmtClass()) { 1258 default: 1259 return false; 1260 case ObjCIvarRefExprClass: 1261 return true; 1262 case Expr::UnaryOperatorClass: 1263 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1264 case ParenExprClass: 1265 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1266 case ImplicitCastExprClass: 1267 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1268 case CStyleCastExprClass: 1269 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1270 case DeclRefExprClass: { 1271 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1272 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1273 if (VD->hasGlobalStorage()) 1274 return true; 1275 QualType T = VD->getType(); 1276 // dereferencing to a pointer is always a gc'able candidate, 1277 // unless it is __weak. 1278 return T->isPointerType() && 1279 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1280 } 1281 return false; 1282 } 1283 case MemberExprClass: { 1284 const MemberExpr *M = cast<MemberExpr>(this); 1285 return M->getBase()->isOBJCGCCandidate(Ctx); 1286 } 1287 case ArraySubscriptExprClass: 1288 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1289 } 1290} 1291Expr* Expr::IgnoreParens() { 1292 Expr* E = this; 1293 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1294 E = P->getSubExpr(); 1295 1296 return E; 1297} 1298 1299/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1300/// or CastExprs or ImplicitCastExprs, returning their operand. 1301Expr *Expr::IgnoreParenCasts() { 1302 Expr *E = this; 1303 while (true) { 1304 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1305 E = P->getSubExpr(); 1306 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1307 E = P->getSubExpr(); 1308 else 1309 return E; 1310 } 1311} 1312 1313/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1314/// value (including ptr->int casts of the same size). Strip off any 1315/// ParenExpr or CastExprs, returning their operand. 1316Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1317 Expr *E = this; 1318 while (true) { 1319 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1320 E = P->getSubExpr(); 1321 continue; 1322 } 1323 1324 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1325 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1326 // ptr<->int casts of the same width. We also ignore all identify casts. 1327 Expr *SE = P->getSubExpr(); 1328 1329 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1330 E = SE; 1331 continue; 1332 } 1333 1334 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1335 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1336 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1337 E = SE; 1338 continue; 1339 } 1340 } 1341 1342 return E; 1343 } 1344} 1345 1346 1347/// hasAnyTypeDependentArguments - Determines if any of the expressions 1348/// in Exprs is type-dependent. 1349bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1350 for (unsigned I = 0; I < NumExprs; ++I) 1351 if (Exprs[I]->isTypeDependent()) 1352 return true; 1353 1354 return false; 1355} 1356 1357/// hasAnyValueDependentArguments - Determines if any of the expressions 1358/// in Exprs is value-dependent. 1359bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1360 for (unsigned I = 0; I < NumExprs; ++I) 1361 if (Exprs[I]->isValueDependent()) 1362 return true; 1363 1364 return false; 1365} 1366 1367bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1368 // This function is attempting whether an expression is an initializer 1369 // which can be evaluated at compile-time. isEvaluatable handles most 1370 // of the cases, but it can't deal with some initializer-specific 1371 // expressions, and it can't deal with aggregates; we deal with those here, 1372 // and fall back to isEvaluatable for the other cases. 1373 1374 // FIXME: This function assumes the variable being assigned to 1375 // isn't a reference type! 1376 1377 switch (getStmtClass()) { 1378 default: break; 1379 case StringLiteralClass: 1380 case ObjCStringLiteralClass: 1381 case ObjCEncodeExprClass: 1382 return true; 1383 case CompoundLiteralExprClass: { 1384 // This handles gcc's extension that allows global initializers like 1385 // "struct x {int x;} x = (struct x) {};". 1386 // FIXME: This accepts other cases it shouldn't! 1387 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1388 return Exp->isConstantInitializer(Ctx); 1389 } 1390 case InitListExprClass: { 1391 // FIXME: This doesn't deal with fields with reference types correctly. 1392 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1393 // to bitfields. 1394 const InitListExpr *Exp = cast<InitListExpr>(this); 1395 unsigned numInits = Exp->getNumInits(); 1396 for (unsigned i = 0; i < numInits; i++) { 1397 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1398 return false; 1399 } 1400 return true; 1401 } 1402 case ImplicitValueInitExprClass: 1403 return true; 1404 case ParenExprClass: 1405 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1406 case UnaryOperatorClass: { 1407 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1408 if (Exp->getOpcode() == UnaryOperator::Extension) 1409 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1410 break; 1411 } 1412 case BinaryOperatorClass: { 1413 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1414 // but this handles the common case. 1415 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1416 if (Exp->getOpcode() == BinaryOperator::Sub && 1417 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1418 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1419 return true; 1420 break; 1421 } 1422 case ImplicitCastExprClass: 1423 case CStyleCastExprClass: 1424 // Handle casts with a destination that's a struct or union; this 1425 // deals with both the gcc no-op struct cast extension and the 1426 // cast-to-union extension. 1427 if (getType()->isRecordType()) 1428 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1429 1430 // Integer->integer casts can be handled here, which is important for 1431 // things like (int)(&&x-&&y). Scary but true. 1432 if (getType()->isIntegerType() && 1433 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1434 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1435 1436 break; 1437 } 1438 return isEvaluatable(Ctx); 1439} 1440 1441/// isIntegerConstantExpr - this recursive routine will test if an expression is 1442/// an integer constant expression. 1443 1444/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1445/// comma, etc 1446/// 1447/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1448/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1449/// cast+dereference. 1450 1451// CheckICE - This function does the fundamental ICE checking: the returned 1452// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1453// Note that to reduce code duplication, this helper does no evaluation 1454// itself; the caller checks whether the expression is evaluatable, and 1455// in the rare cases where CheckICE actually cares about the evaluated 1456// value, it calls into Evalute. 1457// 1458// Meanings of Val: 1459// 0: This expression is an ICE if it can be evaluated by Evaluate. 1460// 1: This expression is not an ICE, but if it isn't evaluated, it's 1461// a legal subexpression for an ICE. This return value is used to handle 1462// the comma operator in C99 mode. 1463// 2: This expression is not an ICE, and is not a legal subexpression for one. 1464 1465struct ICEDiag { 1466 unsigned Val; 1467 SourceLocation Loc; 1468 1469 public: 1470 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1471 ICEDiag() : Val(0) {} 1472}; 1473 1474ICEDiag NoDiag() { return ICEDiag(); } 1475 1476static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1477 Expr::EvalResult EVResult; 1478 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1479 !EVResult.Val.isInt()) { 1480 return ICEDiag(2, E->getLocStart()); 1481 } 1482 return NoDiag(); 1483} 1484 1485static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1486 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1487 if (!E->getType()->isIntegralType()) { 1488 return ICEDiag(2, E->getLocStart()); 1489 } 1490 1491 switch (E->getStmtClass()) { 1492#define STMT(Node, Base) case Expr::Node##Class: 1493#define EXPR(Node, Base) 1494#include "clang/AST/StmtNodes.def" 1495 case Expr::PredefinedExprClass: 1496 case Expr::FloatingLiteralClass: 1497 case Expr::ImaginaryLiteralClass: 1498 case Expr::StringLiteralClass: 1499 case Expr::ArraySubscriptExprClass: 1500 case Expr::MemberExprClass: 1501 case Expr::CompoundAssignOperatorClass: 1502 case Expr::CompoundLiteralExprClass: 1503 case Expr::ExtVectorElementExprClass: 1504 case Expr::InitListExprClass: 1505 case Expr::DesignatedInitExprClass: 1506 case Expr::ImplicitValueInitExprClass: 1507 case Expr::ParenListExprClass: 1508 case Expr::VAArgExprClass: 1509 case Expr::AddrLabelExprClass: 1510 case Expr::StmtExprClass: 1511 case Expr::CXXMemberCallExprClass: 1512 case Expr::CXXDynamicCastExprClass: 1513 case Expr::CXXTypeidExprClass: 1514 case Expr::CXXNullPtrLiteralExprClass: 1515 case Expr::CXXThisExprClass: 1516 case Expr::CXXThrowExprClass: 1517 case Expr::CXXNewExprClass: 1518 case Expr::CXXDeleteExprClass: 1519 case Expr::CXXPseudoDestructorExprClass: 1520 case Expr::UnresolvedLookupExprClass: 1521 case Expr::DependentScopeDeclRefExprClass: 1522 case Expr::CXXConstructExprClass: 1523 case Expr::CXXBindTemporaryExprClass: 1524 case Expr::CXXExprWithTemporariesClass: 1525 case Expr::CXXTemporaryObjectExprClass: 1526 case Expr::CXXUnresolvedConstructExprClass: 1527 case Expr::CXXDependentScopeMemberExprClass: 1528 case Expr::UnresolvedMemberExprClass: 1529 case Expr::ObjCStringLiteralClass: 1530 case Expr::ObjCEncodeExprClass: 1531 case Expr::ObjCMessageExprClass: 1532 case Expr::ObjCSelectorExprClass: 1533 case Expr::ObjCProtocolExprClass: 1534 case Expr::ObjCIvarRefExprClass: 1535 case Expr::ObjCPropertyRefExprClass: 1536 case Expr::ObjCImplicitSetterGetterRefExprClass: 1537 case Expr::ObjCSuperExprClass: 1538 case Expr::ObjCIsaExprClass: 1539 case Expr::ShuffleVectorExprClass: 1540 case Expr::BlockExprClass: 1541 case Expr::BlockDeclRefExprClass: 1542 case Expr::NoStmtClass: 1543 case Expr::ExprClass: 1544 return ICEDiag(2, E->getLocStart()); 1545 1546 case Expr::GNUNullExprClass: 1547 // GCC considers the GNU __null value to be an integral constant expression. 1548 return NoDiag(); 1549 1550 case Expr::ParenExprClass: 1551 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1552 case Expr::IntegerLiteralClass: 1553 case Expr::CharacterLiteralClass: 1554 case Expr::CXXBoolLiteralExprClass: 1555 case Expr::CXXZeroInitValueExprClass: 1556 case Expr::TypesCompatibleExprClass: 1557 case Expr::UnaryTypeTraitExprClass: 1558 return NoDiag(); 1559 case Expr::CallExprClass: 1560 case Expr::CXXOperatorCallExprClass: { 1561 const CallExpr *CE = cast<CallExpr>(E); 1562 if (CE->isBuiltinCall(Ctx)) 1563 return CheckEvalInICE(E, Ctx); 1564 return ICEDiag(2, E->getLocStart()); 1565 } 1566 case Expr::DeclRefExprClass: 1567 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1568 return NoDiag(); 1569 if (Ctx.getLangOptions().CPlusPlus && 1570 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1571 // C++ 7.1.5.1p2 1572 // A variable of non-volatile const-qualified integral or enumeration 1573 // type initialized by an ICE can be used in ICEs. 1574 if (const VarDecl *Dcl = 1575 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1576 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1577 if (Quals.hasVolatile() || !Quals.hasConst()) 1578 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1579 1580 // Look for the definition of this variable, which will actually have 1581 // an initializer. 1582 const VarDecl *Def = 0; 1583 const Expr *Init = Dcl->getDefinition(Def); 1584 if (Init) { 1585 if (Def->isInitKnownICE()) { 1586 // We have already checked whether this subexpression is an 1587 // integral constant expression. 1588 if (Def->isInitICE()) 1589 return NoDiag(); 1590 else 1591 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1592 } 1593 1594 // C++ [class.static.data]p4: 1595 // If a static data member is of const integral or const 1596 // enumeration type, its declaration in the class definition can 1597 // specify a constant-initializer which shall be an integral 1598 // constant expression (5.19). In that case, the member can appear 1599 // in integral constant expressions. 1600 if (Def->isOutOfLine()) { 1601 Dcl->setInitKnownICE(Ctx, false); 1602 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1603 } 1604 1605 ICEDiag Result = CheckICE(Init, Ctx); 1606 // Cache the result of the ICE test. 1607 Dcl->setInitKnownICE(Ctx, Result.Val == 0); 1608 return Result; 1609 } 1610 } 1611 } 1612 return ICEDiag(2, E->getLocStart()); 1613 case Expr::UnaryOperatorClass: { 1614 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1615 switch (Exp->getOpcode()) { 1616 case UnaryOperator::PostInc: 1617 case UnaryOperator::PostDec: 1618 case UnaryOperator::PreInc: 1619 case UnaryOperator::PreDec: 1620 case UnaryOperator::AddrOf: 1621 case UnaryOperator::Deref: 1622 return ICEDiag(2, E->getLocStart()); 1623 1624 case UnaryOperator::Extension: 1625 case UnaryOperator::LNot: 1626 case UnaryOperator::Plus: 1627 case UnaryOperator::Minus: 1628 case UnaryOperator::Not: 1629 case UnaryOperator::Real: 1630 case UnaryOperator::Imag: 1631 return CheckICE(Exp->getSubExpr(), Ctx); 1632 case UnaryOperator::OffsetOf: 1633 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1634 // Evaluate matches the proposed gcc behavior for cases like 1635 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1636 // compliance: we should warn earlier for offsetof expressions with 1637 // array subscripts that aren't ICEs, and if the array subscripts 1638 // are ICEs, the value of the offsetof must be an integer constant. 1639 return CheckEvalInICE(E, Ctx); 1640 } 1641 } 1642 case Expr::SizeOfAlignOfExprClass: { 1643 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1644 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1645 return ICEDiag(2, E->getLocStart()); 1646 return NoDiag(); 1647 } 1648 case Expr::BinaryOperatorClass: { 1649 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1650 switch (Exp->getOpcode()) { 1651 case BinaryOperator::PtrMemD: 1652 case BinaryOperator::PtrMemI: 1653 case BinaryOperator::Assign: 1654 case BinaryOperator::MulAssign: 1655 case BinaryOperator::DivAssign: 1656 case BinaryOperator::RemAssign: 1657 case BinaryOperator::AddAssign: 1658 case BinaryOperator::SubAssign: 1659 case BinaryOperator::ShlAssign: 1660 case BinaryOperator::ShrAssign: 1661 case BinaryOperator::AndAssign: 1662 case BinaryOperator::XorAssign: 1663 case BinaryOperator::OrAssign: 1664 return ICEDiag(2, E->getLocStart()); 1665 1666 case BinaryOperator::Mul: 1667 case BinaryOperator::Div: 1668 case BinaryOperator::Rem: 1669 case BinaryOperator::Add: 1670 case BinaryOperator::Sub: 1671 case BinaryOperator::Shl: 1672 case BinaryOperator::Shr: 1673 case BinaryOperator::LT: 1674 case BinaryOperator::GT: 1675 case BinaryOperator::LE: 1676 case BinaryOperator::GE: 1677 case BinaryOperator::EQ: 1678 case BinaryOperator::NE: 1679 case BinaryOperator::And: 1680 case BinaryOperator::Xor: 1681 case BinaryOperator::Or: 1682 case BinaryOperator::Comma: { 1683 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1684 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1685 if (Exp->getOpcode() == BinaryOperator::Div || 1686 Exp->getOpcode() == BinaryOperator::Rem) { 1687 // Evaluate gives an error for undefined Div/Rem, so make sure 1688 // we don't evaluate one. 1689 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1690 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1691 if (REval == 0) 1692 return ICEDiag(1, E->getLocStart()); 1693 if (REval.isSigned() && REval.isAllOnesValue()) { 1694 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1695 if (LEval.isMinSignedValue()) 1696 return ICEDiag(1, E->getLocStart()); 1697 } 1698 } 1699 } 1700 if (Exp->getOpcode() == BinaryOperator::Comma) { 1701 if (Ctx.getLangOptions().C99) { 1702 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1703 // if it isn't evaluated. 1704 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1705 return ICEDiag(1, E->getLocStart()); 1706 } else { 1707 // In both C89 and C++, commas in ICEs are illegal. 1708 return ICEDiag(2, E->getLocStart()); 1709 } 1710 } 1711 if (LHSResult.Val >= RHSResult.Val) 1712 return LHSResult; 1713 return RHSResult; 1714 } 1715 case BinaryOperator::LAnd: 1716 case BinaryOperator::LOr: { 1717 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1718 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1719 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1720 // Rare case where the RHS has a comma "side-effect"; we need 1721 // to actually check the condition to see whether the side 1722 // with the comma is evaluated. 1723 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1724 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1725 return RHSResult; 1726 return NoDiag(); 1727 } 1728 1729 if (LHSResult.Val >= RHSResult.Val) 1730 return LHSResult; 1731 return RHSResult; 1732 } 1733 } 1734 } 1735 case Expr::CastExprClass: 1736 case Expr::ImplicitCastExprClass: 1737 case Expr::ExplicitCastExprClass: 1738 case Expr::CStyleCastExprClass: 1739 case Expr::CXXFunctionalCastExprClass: 1740 case Expr::CXXNamedCastExprClass: 1741 case Expr::CXXStaticCastExprClass: 1742 case Expr::CXXReinterpretCastExprClass: 1743 case Expr::CXXConstCastExprClass: { 1744 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1745 if (SubExpr->getType()->isIntegralType()) 1746 return CheckICE(SubExpr, Ctx); 1747 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1748 return NoDiag(); 1749 return ICEDiag(2, E->getLocStart()); 1750 } 1751 case Expr::ConditionalOperatorClass: { 1752 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1753 // If the condition (ignoring parens) is a __builtin_constant_p call, 1754 // then only the true side is actually considered in an integer constant 1755 // expression, and it is fully evaluated. This is an important GNU 1756 // extension. See GCC PR38377 for discussion. 1757 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1758 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1759 Expr::EvalResult EVResult; 1760 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1761 !EVResult.Val.isInt()) { 1762 return ICEDiag(2, E->getLocStart()); 1763 } 1764 return NoDiag(); 1765 } 1766 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1767 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1768 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1769 if (CondResult.Val == 2) 1770 return CondResult; 1771 if (TrueResult.Val == 2) 1772 return TrueResult; 1773 if (FalseResult.Val == 2) 1774 return FalseResult; 1775 if (CondResult.Val == 1) 1776 return CondResult; 1777 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1778 return NoDiag(); 1779 // Rare case where the diagnostics depend on which side is evaluated 1780 // Note that if we get here, CondResult is 0, and at least one of 1781 // TrueResult and FalseResult is non-zero. 1782 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1783 return FalseResult; 1784 } 1785 return TrueResult; 1786 } 1787 case Expr::CXXDefaultArgExprClass: 1788 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1789 case Expr::ChooseExprClass: { 1790 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1791 } 1792 } 1793 1794 // Silence a GCC warning 1795 return ICEDiag(2, E->getLocStart()); 1796} 1797 1798bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1799 SourceLocation *Loc, bool isEvaluated) const { 1800 ICEDiag d = CheckICE(this, Ctx); 1801 if (d.Val != 0) { 1802 if (Loc) *Loc = d.Loc; 1803 return false; 1804 } 1805 EvalResult EvalResult; 1806 if (!Evaluate(EvalResult, Ctx)) 1807 llvm::llvm_unreachable("ICE cannot be evaluated!"); 1808 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1809 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1810 Result = EvalResult.Val.getInt(); 1811 return true; 1812} 1813 1814/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1815/// integer constant expression with the value zero, or if this is one that is 1816/// cast to void*. 1817bool Expr::isNullPointerConstant(ASTContext &Ctx, 1818 NullPointerConstantValueDependence NPC) const { 1819 if (isValueDependent()) { 1820 switch (NPC) { 1821 case NPC_NeverValueDependent: 1822 assert(false && "Unexpected value dependent expression!"); 1823 // If the unthinkable happens, fall through to the safest alternative. 1824 1825 case NPC_ValueDependentIsNull: 1826 return isTypeDependent() || getType()->isIntegralType(); 1827 1828 case NPC_ValueDependentIsNotNull: 1829 return false; 1830 } 1831 } 1832 1833 // Strip off a cast to void*, if it exists. Except in C++. 1834 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1835 if (!Ctx.getLangOptions().CPlusPlus) { 1836 // Check that it is a cast to void*. 1837 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1838 QualType Pointee = PT->getPointeeType(); 1839 if (!Pointee.hasQualifiers() && 1840 Pointee->isVoidType() && // to void* 1841 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1842 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1843 } 1844 } 1845 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1846 // Ignore the ImplicitCastExpr type entirely. 1847 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1848 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1849 // Accept ((void*)0) as a null pointer constant, as many other 1850 // implementations do. 1851 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1852 } else if (const CXXDefaultArgExpr *DefaultArg 1853 = dyn_cast<CXXDefaultArgExpr>(this)) { 1854 // See through default argument expressions 1855 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1856 } else if (isa<GNUNullExpr>(this)) { 1857 // The GNU __null extension is always a null pointer constant. 1858 return true; 1859 } 1860 1861 // C++0x nullptr_t is always a null pointer constant. 1862 if (getType()->isNullPtrType()) 1863 return true; 1864 1865 // This expression must be an integer type. 1866 if (!getType()->isIntegerType() || 1867 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1868 return false; 1869 1870 // If we have an integer constant expression, we need to *evaluate* it and 1871 // test for the value 0. 1872 llvm::APSInt Result; 1873 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1874} 1875 1876FieldDecl *Expr::getBitField() { 1877 Expr *E = this->IgnoreParens(); 1878 1879 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1880 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1881 if (Field->isBitField()) 1882 return Field; 1883 1884 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1885 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1886 return BinOp->getLHS()->getBitField(); 1887 1888 return 0; 1889} 1890 1891/// isArrow - Return true if the base expression is a pointer to vector, 1892/// return false if the base expression is a vector. 1893bool ExtVectorElementExpr::isArrow() const { 1894 return getBase()->getType()->isPointerType(); 1895} 1896 1897unsigned ExtVectorElementExpr::getNumElements() const { 1898 if (const VectorType *VT = getType()->getAs<VectorType>()) 1899 return VT->getNumElements(); 1900 return 1; 1901} 1902 1903/// containsDuplicateElements - Return true if any element access is repeated. 1904bool ExtVectorElementExpr::containsDuplicateElements() const { 1905 // FIXME: Refactor this code to an accessor on the AST node which returns the 1906 // "type" of component access, and share with code below and in Sema. 1907 llvm::StringRef Comp = Accessor->getName(); 1908 1909 // Halving swizzles do not contain duplicate elements. 1910 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1911 return false; 1912 1913 // Advance past s-char prefix on hex swizzles. 1914 if (Comp[0] == 's' || Comp[0] == 'S') 1915 Comp = Comp.substr(1); 1916 1917 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1918 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1919 return true; 1920 1921 return false; 1922} 1923 1924/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1925void ExtVectorElementExpr::getEncodedElementAccess( 1926 llvm::SmallVectorImpl<unsigned> &Elts) const { 1927 llvm::StringRef Comp = Accessor->getName(); 1928 if (Comp[0] == 's' || Comp[0] == 'S') 1929 Comp = Comp.substr(1); 1930 1931 bool isHi = Comp == "hi"; 1932 bool isLo = Comp == "lo"; 1933 bool isEven = Comp == "even"; 1934 bool isOdd = Comp == "odd"; 1935 1936 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1937 uint64_t Index; 1938 1939 if (isHi) 1940 Index = e + i; 1941 else if (isLo) 1942 Index = i; 1943 else if (isEven) 1944 Index = 2 * i; 1945 else if (isOdd) 1946 Index = 2 * i + 1; 1947 else 1948 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1949 1950 Elts.push_back(Index); 1951 } 1952} 1953 1954// constructor for instance messages. 1955ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1956 QualType retType, ObjCMethodDecl *mproto, 1957 SourceLocation LBrac, SourceLocation RBrac, 1958 Expr **ArgExprs, unsigned nargs) 1959 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1960 MethodProto(mproto) { 1961 NumArgs = nargs; 1962 SubExprs = new Stmt*[NumArgs+1]; 1963 SubExprs[RECEIVER] = receiver; 1964 if (NumArgs) { 1965 for (unsigned i = 0; i != NumArgs; ++i) 1966 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1967 } 1968 LBracloc = LBrac; 1969 RBracloc = RBrac; 1970} 1971 1972// constructor for class messages. 1973// FIXME: clsName should be typed to ObjCInterfaceType 1974ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1975 QualType retType, ObjCMethodDecl *mproto, 1976 SourceLocation LBrac, SourceLocation RBrac, 1977 Expr **ArgExprs, unsigned nargs) 1978 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1979 MethodProto(mproto) { 1980 NumArgs = nargs; 1981 SubExprs = new Stmt*[NumArgs+1]; 1982 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1983 if (NumArgs) { 1984 for (unsigned i = 0; i != NumArgs; ++i) 1985 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1986 } 1987 LBracloc = LBrac; 1988 RBracloc = RBrac; 1989} 1990 1991// constructor for class messages. 1992ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 1993 QualType retType, ObjCMethodDecl *mproto, 1994 SourceLocation LBrac, SourceLocation RBrac, 1995 Expr **ArgExprs, unsigned nargs) 1996: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1997MethodProto(mproto) { 1998 NumArgs = nargs; 1999 SubExprs = new Stmt*[NumArgs+1]; 2000 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2001 if (NumArgs) { 2002 for (unsigned i = 0; i != NumArgs; ++i) 2003 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2004 } 2005 LBracloc = LBrac; 2006 RBracloc = RBrac; 2007} 2008 2009ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2010 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2011 switch (x & Flags) { 2012 default: 2013 assert(false && "Invalid ObjCMessageExpr."); 2014 case IsInstMeth: 2015 return ClassInfo(0, 0); 2016 case IsClsMethDeclUnknown: 2017 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2018 case IsClsMethDeclKnown: { 2019 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2020 return ClassInfo(D, D->getIdentifier()); 2021 } 2022 } 2023} 2024 2025void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2026 if (CI.first == 0 && CI.second == 0) 2027 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2028 else if (CI.first == 0) 2029 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2030 else 2031 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2032} 2033 2034 2035bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2036 return getCond()->EvaluateAsInt(C) != 0; 2037} 2038 2039void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2040 unsigned NumExprs) { 2041 if (SubExprs) C.Deallocate(SubExprs); 2042 2043 SubExprs = new (C) Stmt* [NumExprs]; 2044 this->NumExprs = NumExprs; 2045 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2046} 2047 2048void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2049 DestroyChildren(C); 2050 if (SubExprs) C.Deallocate(SubExprs); 2051 this->~ShuffleVectorExpr(); 2052 C.Deallocate(this); 2053} 2054 2055void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2056 // Override default behavior of traversing children. If this has a type 2057 // operand and the type is a variable-length array, the child iteration 2058 // will iterate over the size expression. However, this expression belongs 2059 // to the type, not to this, so we don't want to delete it. 2060 // We still want to delete this expression. 2061 if (isArgumentType()) { 2062 this->~SizeOfAlignOfExpr(); 2063 C.Deallocate(this); 2064 } 2065 else 2066 Expr::DoDestroy(C); 2067} 2068 2069//===----------------------------------------------------------------------===// 2070// DesignatedInitExpr 2071//===----------------------------------------------------------------------===// 2072 2073IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2074 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2075 if (Field.NameOrField & 0x01) 2076 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2077 else 2078 return getField()->getIdentifier(); 2079} 2080 2081DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2082 const Designator *Designators, 2083 SourceLocation EqualOrColonLoc, 2084 bool GNUSyntax, 2085 Expr **IndexExprs, 2086 unsigned NumIndexExprs, 2087 Expr *Init) 2088 : Expr(DesignatedInitExprClass, Ty, 2089 Init->isTypeDependent(), Init->isValueDependent()), 2090 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2091 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2092 this->Designators = new Designator[NumDesignators]; 2093 2094 // Record the initializer itself. 2095 child_iterator Child = child_begin(); 2096 *Child++ = Init; 2097 2098 // Copy the designators and their subexpressions, computing 2099 // value-dependence along the way. 2100 unsigned IndexIdx = 0; 2101 for (unsigned I = 0; I != NumDesignators; ++I) { 2102 this->Designators[I] = Designators[I]; 2103 2104 if (this->Designators[I].isArrayDesignator()) { 2105 // Compute type- and value-dependence. 2106 Expr *Index = IndexExprs[IndexIdx]; 2107 ValueDependent = ValueDependent || 2108 Index->isTypeDependent() || Index->isValueDependent(); 2109 2110 // Copy the index expressions into permanent storage. 2111 *Child++ = IndexExprs[IndexIdx++]; 2112 } else if (this->Designators[I].isArrayRangeDesignator()) { 2113 // Compute type- and value-dependence. 2114 Expr *Start = IndexExprs[IndexIdx]; 2115 Expr *End = IndexExprs[IndexIdx + 1]; 2116 ValueDependent = ValueDependent || 2117 Start->isTypeDependent() || Start->isValueDependent() || 2118 End->isTypeDependent() || End->isValueDependent(); 2119 2120 // Copy the start/end expressions into permanent storage. 2121 *Child++ = IndexExprs[IndexIdx++]; 2122 *Child++ = IndexExprs[IndexIdx++]; 2123 } 2124 } 2125 2126 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2127} 2128 2129DesignatedInitExpr * 2130DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2131 unsigned NumDesignators, 2132 Expr **IndexExprs, unsigned NumIndexExprs, 2133 SourceLocation ColonOrEqualLoc, 2134 bool UsesColonSyntax, Expr *Init) { 2135 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2136 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2137 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2138 ColonOrEqualLoc, UsesColonSyntax, 2139 IndexExprs, NumIndexExprs, Init); 2140} 2141 2142DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2143 unsigned NumIndexExprs) { 2144 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2145 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2146 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2147} 2148 2149void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2150 unsigned NumDesigs) { 2151 if (Designators) 2152 delete [] Designators; 2153 2154 Designators = new Designator[NumDesigs]; 2155 NumDesignators = NumDesigs; 2156 for (unsigned I = 0; I != NumDesigs; ++I) 2157 Designators[I] = Desigs[I]; 2158} 2159 2160SourceRange DesignatedInitExpr::getSourceRange() const { 2161 SourceLocation StartLoc; 2162 Designator &First = 2163 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2164 if (First.isFieldDesignator()) { 2165 if (GNUSyntax) 2166 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2167 else 2168 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2169 } else 2170 StartLoc = 2171 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2172 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2173} 2174 2175Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2176 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2177 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2178 Ptr += sizeof(DesignatedInitExpr); 2179 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2180 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2181} 2182 2183Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2184 assert(D.Kind == Designator::ArrayRangeDesignator && 2185 "Requires array range designator"); 2186 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2187 Ptr += sizeof(DesignatedInitExpr); 2188 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2189 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2190} 2191 2192Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2193 assert(D.Kind == Designator::ArrayRangeDesignator && 2194 "Requires array range designator"); 2195 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2196 Ptr += sizeof(DesignatedInitExpr); 2197 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2198 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2199} 2200 2201/// \brief Replaces the designator at index @p Idx with the series 2202/// of designators in [First, Last). 2203void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2204 const Designator *First, 2205 const Designator *Last) { 2206 unsigned NumNewDesignators = Last - First; 2207 if (NumNewDesignators == 0) { 2208 std::copy_backward(Designators + Idx + 1, 2209 Designators + NumDesignators, 2210 Designators + Idx); 2211 --NumNewDesignators; 2212 return; 2213 } else if (NumNewDesignators == 1) { 2214 Designators[Idx] = *First; 2215 return; 2216 } 2217 2218 Designator *NewDesignators 2219 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2220 std::copy(Designators, Designators + Idx, NewDesignators); 2221 std::copy(First, Last, NewDesignators + Idx); 2222 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2223 NewDesignators + Idx + NumNewDesignators); 2224 delete [] Designators; 2225 Designators = NewDesignators; 2226 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2227} 2228 2229void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2230 delete [] Designators; 2231 Expr::DoDestroy(C); 2232} 2233 2234ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2235 Expr **exprs, unsigned nexprs, 2236 SourceLocation rparenloc) 2237: Expr(ParenListExprClass, QualType(), 2238 hasAnyTypeDependentArguments(exprs, nexprs), 2239 hasAnyValueDependentArguments(exprs, nexprs)), 2240 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2241 2242 Exprs = new (C) Stmt*[nexprs]; 2243 for (unsigned i = 0; i != nexprs; ++i) 2244 Exprs[i] = exprs[i]; 2245} 2246 2247void ParenListExpr::DoDestroy(ASTContext& C) { 2248 DestroyChildren(C); 2249 if (Exprs) C.Deallocate(Exprs); 2250 this->~ParenListExpr(); 2251 C.Deallocate(this); 2252} 2253 2254//===----------------------------------------------------------------------===// 2255// ExprIterator. 2256//===----------------------------------------------------------------------===// 2257 2258Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2259Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2260Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2261const Expr* ConstExprIterator::operator[](size_t idx) const { 2262 return cast<Expr>(I[idx]); 2263} 2264const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2265const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2266 2267//===----------------------------------------------------------------------===// 2268// Child Iterators for iterating over subexpressions/substatements 2269//===----------------------------------------------------------------------===// 2270 2271// DeclRefExpr 2272Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2273Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2274 2275// ObjCIvarRefExpr 2276Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2277Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2278 2279// ObjCPropertyRefExpr 2280Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2281Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2282 2283// ObjCImplicitSetterGetterRefExpr 2284Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2285 return &Base; 2286} 2287Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2288 return &Base+1; 2289} 2290 2291// ObjCSuperExpr 2292Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2293Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2294 2295// ObjCIsaExpr 2296Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2297Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2298 2299// PredefinedExpr 2300Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2301Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2302 2303// IntegerLiteral 2304Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2305Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2306 2307// CharacterLiteral 2308Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2309Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2310 2311// FloatingLiteral 2312Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2313Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2314 2315// ImaginaryLiteral 2316Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2317Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2318 2319// StringLiteral 2320Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2321Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2322 2323// ParenExpr 2324Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2325Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2326 2327// UnaryOperator 2328Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2329Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2330 2331// SizeOfAlignOfExpr 2332Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2333 // If this is of a type and the type is a VLA type (and not a typedef), the 2334 // size expression of the VLA needs to be treated as an executable expression. 2335 // Why isn't this weirdness documented better in StmtIterator? 2336 if (isArgumentType()) { 2337 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2338 getArgumentType().getTypePtr())) 2339 return child_iterator(T); 2340 return child_iterator(); 2341 } 2342 return child_iterator(&Argument.Ex); 2343} 2344Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2345 if (isArgumentType()) 2346 return child_iterator(); 2347 return child_iterator(&Argument.Ex + 1); 2348} 2349 2350// ArraySubscriptExpr 2351Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2352 return &SubExprs[0]; 2353} 2354Stmt::child_iterator ArraySubscriptExpr::child_end() { 2355 return &SubExprs[0]+END_EXPR; 2356} 2357 2358// CallExpr 2359Stmt::child_iterator CallExpr::child_begin() { 2360 return &SubExprs[0]; 2361} 2362Stmt::child_iterator CallExpr::child_end() { 2363 return &SubExprs[0]+NumArgs+ARGS_START; 2364} 2365 2366// MemberExpr 2367Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2368Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2369 2370// ExtVectorElementExpr 2371Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2372Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2373 2374// CompoundLiteralExpr 2375Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2376Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2377 2378// CastExpr 2379Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2380Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2381 2382// BinaryOperator 2383Stmt::child_iterator BinaryOperator::child_begin() { 2384 return &SubExprs[0]; 2385} 2386Stmt::child_iterator BinaryOperator::child_end() { 2387 return &SubExprs[0]+END_EXPR; 2388} 2389 2390// ConditionalOperator 2391Stmt::child_iterator ConditionalOperator::child_begin() { 2392 return &SubExprs[0]; 2393} 2394Stmt::child_iterator ConditionalOperator::child_end() { 2395 return &SubExprs[0]+END_EXPR; 2396} 2397 2398// AddrLabelExpr 2399Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2400Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2401 2402// StmtExpr 2403Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2404Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2405 2406// TypesCompatibleExpr 2407Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2408 return child_iterator(); 2409} 2410 2411Stmt::child_iterator TypesCompatibleExpr::child_end() { 2412 return child_iterator(); 2413} 2414 2415// ChooseExpr 2416Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2417Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2418 2419// GNUNullExpr 2420Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2421Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2422 2423// ShuffleVectorExpr 2424Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2425 return &SubExprs[0]; 2426} 2427Stmt::child_iterator ShuffleVectorExpr::child_end() { 2428 return &SubExprs[0]+NumExprs; 2429} 2430 2431// VAArgExpr 2432Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2433Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2434 2435// InitListExpr 2436Stmt::child_iterator InitListExpr::child_begin() { 2437 return InitExprs.size() ? &InitExprs[0] : 0; 2438} 2439Stmt::child_iterator InitListExpr::child_end() { 2440 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2441} 2442 2443// DesignatedInitExpr 2444Stmt::child_iterator DesignatedInitExpr::child_begin() { 2445 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2446 Ptr += sizeof(DesignatedInitExpr); 2447 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2448} 2449Stmt::child_iterator DesignatedInitExpr::child_end() { 2450 return child_iterator(&*child_begin() + NumSubExprs); 2451} 2452 2453// ImplicitValueInitExpr 2454Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2455 return child_iterator(); 2456} 2457 2458Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2459 return child_iterator(); 2460} 2461 2462// ParenListExpr 2463Stmt::child_iterator ParenListExpr::child_begin() { 2464 return &Exprs[0]; 2465} 2466Stmt::child_iterator ParenListExpr::child_end() { 2467 return &Exprs[0]+NumExprs; 2468} 2469 2470// ObjCStringLiteral 2471Stmt::child_iterator ObjCStringLiteral::child_begin() { 2472 return &String; 2473} 2474Stmt::child_iterator ObjCStringLiteral::child_end() { 2475 return &String+1; 2476} 2477 2478// ObjCEncodeExpr 2479Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2480Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2481 2482// ObjCSelectorExpr 2483Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2484 return child_iterator(); 2485} 2486Stmt::child_iterator ObjCSelectorExpr::child_end() { 2487 return child_iterator(); 2488} 2489 2490// ObjCProtocolExpr 2491Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2492 return child_iterator(); 2493} 2494Stmt::child_iterator ObjCProtocolExpr::child_end() { 2495 return child_iterator(); 2496} 2497 2498// ObjCMessageExpr 2499Stmt::child_iterator ObjCMessageExpr::child_begin() { 2500 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2501} 2502Stmt::child_iterator ObjCMessageExpr::child_end() { 2503 return &SubExprs[0]+ARGS_START+getNumArgs(); 2504} 2505 2506// Blocks 2507Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2508Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2509 2510Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2511Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2512