Expr.cpp revision 820bca41c3899374775d2a1dfc2ef2e22aaf1c7b
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// Primary Expressions. 32//===----------------------------------------------------------------------===// 33 34void ExplicitTemplateArgumentList::initializeFrom( 35 const TemplateArgumentListInfo &Info) { 36 LAngleLoc = Info.getLAngleLoc(); 37 RAngleLoc = Info.getRAngleLoc(); 38 NumTemplateArgs = Info.size(); 39 40 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 41 for (unsigned i = 0; i != NumTemplateArgs; ++i) 42 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 43} 44 45void ExplicitTemplateArgumentList::copyInto( 46 TemplateArgumentListInfo &Info) const { 47 Info.setLAngleLoc(LAngleLoc); 48 Info.setRAngleLoc(RAngleLoc); 49 for (unsigned I = 0; I != NumTemplateArgs; ++I) 50 Info.addArgument(getTemplateArgs()[I]); 51} 52 53std::size_t ExplicitTemplateArgumentList::sizeFor( 54 const TemplateArgumentListInfo &Info) { 55 return sizeof(ExplicitTemplateArgumentList) + 56 sizeof(TemplateArgumentLoc) * Info.size(); 57} 58 59void DeclRefExpr::computeDependence() { 60 TypeDependent = false; 61 ValueDependent = false; 62 63 NamedDecl *D = getDecl(); 64 65 // (TD) C++ [temp.dep.expr]p3: 66 // An id-expression is type-dependent if it contains: 67 // 68 // and 69 // 70 // (VD) C++ [temp.dep.constexpr]p2: 71 // An identifier is value-dependent if it is: 72 73 // (TD) - an identifier that was declared with dependent type 74 // (VD) - a name declared with a dependent type, 75 if (getType()->isDependentType()) { 76 TypeDependent = true; 77 ValueDependent = true; 78 } 79 // (TD) - a conversion-function-id that specifies a dependent type 80 else if (D->getDeclName().getNameKind() 81 == DeclarationName::CXXConversionFunctionName && 82 D->getDeclName().getCXXNameType()->isDependentType()) { 83 TypeDependent = true; 84 ValueDependent = true; 85 } 86 // (TD) - a template-id that is dependent, 87 else if (hasExplicitTemplateArgumentList() && 88 TemplateSpecializationType::anyDependentTemplateArguments( 89 getTemplateArgs(), 90 getNumTemplateArgs())) { 91 TypeDependent = true; 92 ValueDependent = true; 93 } 94 // (VD) - the name of a non-type template parameter, 95 else if (isa<NonTypeTemplateParmDecl>(D)) 96 ValueDependent = true; 97 // (VD) - a constant with integral or enumeration type and is 98 // initialized with an expression that is value-dependent. 99 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 100 if (Var->getType()->isIntegralType() && 101 Var->getType().getCVRQualifiers() == Qualifiers::Const && 102 Var->getInit() && 103 Var->getInit()->isValueDependent()) 104 ValueDependent = true; 105 } 106 // (TD) - a nested-name-specifier or a qualified-id that names a 107 // member of an unknown specialization. 108 // (handled by DependentScopeDeclRefExpr) 109} 110 111DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 112 SourceRange QualifierRange, 113 ValueDecl *D, SourceLocation NameLoc, 114 const TemplateArgumentListInfo *TemplateArgs, 115 QualType T) 116 : Expr(DeclRefExprClass, T, false, false), 117 DecoratedD(D, 118 (Qualifier? HasQualifierFlag : 0) | 119 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 120 Loc(NameLoc) { 121 if (Qualifier) { 122 NameQualifier *NQ = getNameQualifier(); 123 NQ->NNS = Qualifier; 124 NQ->Range = QualifierRange; 125 } 126 127 if (TemplateArgs) 128 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 129 130 computeDependence(); 131} 132 133DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 134 NestedNameSpecifier *Qualifier, 135 SourceRange QualifierRange, 136 ValueDecl *D, 137 SourceLocation NameLoc, 138 QualType T, 139 const TemplateArgumentListInfo *TemplateArgs) { 140 std::size_t Size = sizeof(DeclRefExpr); 141 if (Qualifier != 0) 142 Size += sizeof(NameQualifier); 143 144 if (TemplateArgs) 145 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 146 147 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 148 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 149 TemplateArgs, T); 150} 151 152SourceRange DeclRefExpr::getSourceRange() const { 153 // FIXME: Does not handle multi-token names well, e.g., operator[]. 154 SourceRange R(Loc); 155 156 if (hasQualifier()) 157 R.setBegin(getQualifierRange().getBegin()); 158 if (hasExplicitTemplateArgumentList()) 159 R.setEnd(getRAngleLoc()); 160 return R; 161} 162 163// FIXME: Maybe this should use DeclPrinter with a special "print predefined 164// expr" policy instead. 165std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 166 const Decl *CurrentDecl) { 167 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 168 if (IT != PrettyFunction) 169 return FD->getNameAsString(); 170 171 llvm::SmallString<256> Name; 172 llvm::raw_svector_ostream Out(Name); 173 174 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 175 if (MD->isVirtual()) 176 Out << "virtual "; 177 } 178 179 PrintingPolicy Policy(Context.getLangOptions()); 180 Policy.SuppressTagKind = true; 181 182 std::string Proto = FD->getQualifiedNameAsString(Policy); 183 184 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 185 const FunctionProtoType *FT = 0; 186 if (FD->hasWrittenPrototype()) 187 FT = dyn_cast<FunctionProtoType>(AFT); 188 189 Proto += "("; 190 if (FT) { 191 llvm::raw_string_ostream POut(Proto); 192 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 193 if (i) POut << ", "; 194 std::string Param; 195 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 196 POut << Param; 197 } 198 199 if (FT->isVariadic()) { 200 if (FD->getNumParams()) POut << ", "; 201 POut << "..."; 202 } 203 } 204 Proto += ")"; 205 206 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 207 AFT->getResultType().getAsStringInternal(Proto, Policy); 208 209 Out << Proto; 210 211 Out.flush(); 212 return Name.str().str(); 213 } 214 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 215 llvm::SmallString<256> Name; 216 llvm::raw_svector_ostream Out(Name); 217 Out << (MD->isInstanceMethod() ? '-' : '+'); 218 Out << '['; 219 Out << MD->getClassInterface()->getNameAsString(); 220 if (const ObjCCategoryImplDecl *CID = 221 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 222 Out << '('; 223 Out << CID->getNameAsString(); 224 Out << ')'; 225 } 226 Out << ' '; 227 Out << MD->getSelector().getAsString(); 228 Out << ']'; 229 230 Out.flush(); 231 return Name.str().str(); 232 } 233 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 234 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 235 return "top level"; 236 } 237 return ""; 238} 239 240/// getValueAsApproximateDouble - This returns the value as an inaccurate 241/// double. Note that this may cause loss of precision, but is useful for 242/// debugging dumps, etc. 243double FloatingLiteral::getValueAsApproximateDouble() const { 244 llvm::APFloat V = getValue(); 245 bool ignored; 246 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 247 &ignored); 248 return V.convertToDouble(); 249} 250 251StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 252 unsigned ByteLength, bool Wide, 253 QualType Ty, 254 const SourceLocation *Loc, 255 unsigned NumStrs) { 256 // Allocate enough space for the StringLiteral plus an array of locations for 257 // any concatenated string tokens. 258 void *Mem = C.Allocate(sizeof(StringLiteral)+ 259 sizeof(SourceLocation)*(NumStrs-1), 260 llvm::alignof<StringLiteral>()); 261 StringLiteral *SL = new (Mem) StringLiteral(Ty); 262 263 // OPTIMIZE: could allocate this appended to the StringLiteral. 264 char *AStrData = new (C, 1) char[ByteLength]; 265 memcpy(AStrData, StrData, ByteLength); 266 SL->StrData = AStrData; 267 SL->ByteLength = ByteLength; 268 SL->IsWide = Wide; 269 SL->TokLocs[0] = Loc[0]; 270 SL->NumConcatenated = NumStrs; 271 272 if (NumStrs != 1) 273 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 274 return SL; 275} 276 277StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 278 void *Mem = C.Allocate(sizeof(StringLiteral)+ 279 sizeof(SourceLocation)*(NumStrs-1), 280 llvm::alignof<StringLiteral>()); 281 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 282 SL->StrData = 0; 283 SL->ByteLength = 0; 284 SL->NumConcatenated = NumStrs; 285 return SL; 286} 287 288void StringLiteral::DoDestroy(ASTContext &C) { 289 C.Deallocate(const_cast<char*>(StrData)); 290 Expr::DoDestroy(C); 291} 292 293void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 294 if (StrData) 295 C.Deallocate(const_cast<char*>(StrData)); 296 297 char *AStrData = new (C, 1) char[Str.size()]; 298 memcpy(AStrData, Str.data(), Str.size()); 299 StrData = AStrData; 300 ByteLength = Str.size(); 301} 302 303/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 304/// corresponds to, e.g. "sizeof" or "[pre]++". 305const char *UnaryOperator::getOpcodeStr(Opcode Op) { 306 switch (Op) { 307 default: assert(0 && "Unknown unary operator"); 308 case PostInc: return "++"; 309 case PostDec: return "--"; 310 case PreInc: return "++"; 311 case PreDec: return "--"; 312 case AddrOf: return "&"; 313 case Deref: return "*"; 314 case Plus: return "+"; 315 case Minus: return "-"; 316 case Not: return "~"; 317 case LNot: return "!"; 318 case Real: return "__real"; 319 case Imag: return "__imag"; 320 case Extension: return "__extension__"; 321 case OffsetOf: return "__builtin_offsetof"; 322 } 323} 324 325UnaryOperator::Opcode 326UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 327 switch (OO) { 328 default: assert(false && "No unary operator for overloaded function"); 329 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 330 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 331 case OO_Amp: return AddrOf; 332 case OO_Star: return Deref; 333 case OO_Plus: return Plus; 334 case OO_Minus: return Minus; 335 case OO_Tilde: return Not; 336 case OO_Exclaim: return LNot; 337 } 338} 339 340OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 341 switch (Opc) { 342 case PostInc: case PreInc: return OO_PlusPlus; 343 case PostDec: case PreDec: return OO_MinusMinus; 344 case AddrOf: return OO_Amp; 345 case Deref: return OO_Star; 346 case Plus: return OO_Plus; 347 case Minus: return OO_Minus; 348 case Not: return OO_Tilde; 349 case LNot: return OO_Exclaim; 350 default: return OO_None; 351 } 352} 353 354 355//===----------------------------------------------------------------------===// 356// Postfix Operators. 357//===----------------------------------------------------------------------===// 358 359CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 360 unsigned numargs, QualType t, SourceLocation rparenloc) 361 : Expr(SC, t, 362 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 363 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 364 NumArgs(numargs) { 365 366 SubExprs = new (C) Stmt*[numargs+1]; 367 SubExprs[FN] = fn; 368 for (unsigned i = 0; i != numargs; ++i) 369 SubExprs[i+ARGS_START] = args[i]; 370 371 RParenLoc = rparenloc; 372} 373 374CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 375 QualType t, SourceLocation rparenloc) 376 : Expr(CallExprClass, t, 377 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 378 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 379 NumArgs(numargs) { 380 381 SubExprs = new (C) Stmt*[numargs+1]; 382 SubExprs[FN] = fn; 383 for (unsigned i = 0; i != numargs; ++i) 384 SubExprs[i+ARGS_START] = args[i]; 385 386 RParenLoc = rparenloc; 387} 388 389CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 390 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 391 SubExprs = new (C) Stmt*[1]; 392} 393 394void CallExpr::DoDestroy(ASTContext& C) { 395 DestroyChildren(C); 396 if (SubExprs) C.Deallocate(SubExprs); 397 this->~CallExpr(); 398 C.Deallocate(this); 399} 400 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 case CastExpr::CK_AnyPointerToObjCPointerCast: 562 return "AnyPointerToObjCPointerCast"; 563 } 564 565 assert(0 && "Unhandled cast kind!"); 566 return 0; 567} 568 569/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 570/// corresponds to, e.g. "<<=". 571const char *BinaryOperator::getOpcodeStr(Opcode Op) { 572 switch (Op) { 573 case PtrMemD: return ".*"; 574 case PtrMemI: return "->*"; 575 case Mul: return "*"; 576 case Div: return "/"; 577 case Rem: return "%"; 578 case Add: return "+"; 579 case Sub: return "-"; 580 case Shl: return "<<"; 581 case Shr: return ">>"; 582 case LT: return "<"; 583 case GT: return ">"; 584 case LE: return "<="; 585 case GE: return ">="; 586 case EQ: return "=="; 587 case NE: return "!="; 588 case And: return "&"; 589 case Xor: return "^"; 590 case Or: return "|"; 591 case LAnd: return "&&"; 592 case LOr: return "||"; 593 case Assign: return "="; 594 case MulAssign: return "*="; 595 case DivAssign: return "/="; 596 case RemAssign: return "%="; 597 case AddAssign: return "+="; 598 case SubAssign: return "-="; 599 case ShlAssign: return "<<="; 600 case ShrAssign: return ">>="; 601 case AndAssign: return "&="; 602 case XorAssign: return "^="; 603 case OrAssign: return "|="; 604 case Comma: return ","; 605 } 606 607 return ""; 608} 609 610BinaryOperator::Opcode 611BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 612 switch (OO) { 613 default: assert(false && "Not an overloadable binary operator"); 614 case OO_Plus: return Add; 615 case OO_Minus: return Sub; 616 case OO_Star: return Mul; 617 case OO_Slash: return Div; 618 case OO_Percent: return Rem; 619 case OO_Caret: return Xor; 620 case OO_Amp: return And; 621 case OO_Pipe: return Or; 622 case OO_Equal: return Assign; 623 case OO_Less: return LT; 624 case OO_Greater: return GT; 625 case OO_PlusEqual: return AddAssign; 626 case OO_MinusEqual: return SubAssign; 627 case OO_StarEqual: return MulAssign; 628 case OO_SlashEqual: return DivAssign; 629 case OO_PercentEqual: return RemAssign; 630 case OO_CaretEqual: return XorAssign; 631 case OO_AmpEqual: return AndAssign; 632 case OO_PipeEqual: return OrAssign; 633 case OO_LessLess: return Shl; 634 case OO_GreaterGreater: return Shr; 635 case OO_LessLessEqual: return ShlAssign; 636 case OO_GreaterGreaterEqual: return ShrAssign; 637 case OO_EqualEqual: return EQ; 638 case OO_ExclaimEqual: return NE; 639 case OO_LessEqual: return LE; 640 case OO_GreaterEqual: return GE; 641 case OO_AmpAmp: return LAnd; 642 case OO_PipePipe: return LOr; 643 case OO_Comma: return Comma; 644 case OO_ArrowStar: return PtrMemI; 645 } 646} 647 648OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 649 static const OverloadedOperatorKind OverOps[] = { 650 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 651 OO_Star, OO_Slash, OO_Percent, 652 OO_Plus, OO_Minus, 653 OO_LessLess, OO_GreaterGreater, 654 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 655 OO_EqualEqual, OO_ExclaimEqual, 656 OO_Amp, 657 OO_Caret, 658 OO_Pipe, 659 OO_AmpAmp, 660 OO_PipePipe, 661 OO_Equal, OO_StarEqual, 662 OO_SlashEqual, OO_PercentEqual, 663 OO_PlusEqual, OO_MinusEqual, 664 OO_LessLessEqual, OO_GreaterGreaterEqual, 665 OO_AmpEqual, OO_CaretEqual, 666 OO_PipeEqual, 667 OO_Comma 668 }; 669 return OverOps[Opc]; 670} 671 672InitListExpr::InitListExpr(SourceLocation lbraceloc, 673 Expr **initExprs, unsigned numInits, 674 SourceLocation rbraceloc) 675 : Expr(InitListExprClass, QualType(), false, false), 676 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 677 UnionFieldInit(0), HadArrayRangeDesignator(false) 678{ 679 for (unsigned I = 0; I != numInits; ++I) { 680 if (initExprs[I]->isTypeDependent()) 681 TypeDependent = true; 682 if (initExprs[I]->isValueDependent()) 683 ValueDependent = true; 684 } 685 686 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 687} 688 689void InitListExpr::reserveInits(unsigned NumInits) { 690 if (NumInits > InitExprs.size()) 691 InitExprs.reserve(NumInits); 692} 693 694void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 695 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 696 Idx < LastIdx; ++Idx) 697 InitExprs[Idx]->Destroy(Context); 698 InitExprs.resize(NumInits, 0); 699} 700 701Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 702 if (Init >= InitExprs.size()) { 703 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 704 InitExprs.back() = expr; 705 return 0; 706 } 707 708 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 709 InitExprs[Init] = expr; 710 return Result; 711} 712 713/// getFunctionType - Return the underlying function type for this block. 714/// 715const FunctionType *BlockExpr::getFunctionType() const { 716 return getType()->getAs<BlockPointerType>()-> 717 getPointeeType()->getAs<FunctionType>(); 718} 719 720SourceLocation BlockExpr::getCaretLocation() const { 721 return TheBlock->getCaretLocation(); 722} 723const Stmt *BlockExpr::getBody() const { 724 return TheBlock->getBody(); 725} 726Stmt *BlockExpr::getBody() { 727 return TheBlock->getBody(); 728} 729 730 731//===----------------------------------------------------------------------===// 732// Generic Expression Routines 733//===----------------------------------------------------------------------===// 734 735/// isUnusedResultAWarning - Return true if this immediate expression should 736/// be warned about if the result is unused. If so, fill in Loc and Ranges 737/// with location to warn on and the source range[s] to report with the 738/// warning. 739bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 740 SourceRange &R2, ASTContext &Ctx) const { 741 // Don't warn if the expr is type dependent. The type could end up 742 // instantiating to void. 743 if (isTypeDependent()) 744 return false; 745 746 switch (getStmtClass()) { 747 default: 748 Loc = getExprLoc(); 749 R1 = getSourceRange(); 750 return true; 751 case ParenExprClass: 752 return cast<ParenExpr>(this)->getSubExpr()-> 753 isUnusedResultAWarning(Loc, R1, R2, Ctx); 754 case UnaryOperatorClass: { 755 const UnaryOperator *UO = cast<UnaryOperator>(this); 756 757 switch (UO->getOpcode()) { 758 default: break; 759 case UnaryOperator::PostInc: 760 case UnaryOperator::PostDec: 761 case UnaryOperator::PreInc: 762 case UnaryOperator::PreDec: // ++/-- 763 return false; // Not a warning. 764 case UnaryOperator::Deref: 765 // Dereferencing a volatile pointer is a side-effect. 766 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 767 return false; 768 break; 769 case UnaryOperator::Real: 770 case UnaryOperator::Imag: 771 // accessing a piece of a volatile complex is a side-effect. 772 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 773 .isVolatileQualified()) 774 return false; 775 break; 776 case UnaryOperator::Extension: 777 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 778 } 779 Loc = UO->getOperatorLoc(); 780 R1 = UO->getSubExpr()->getSourceRange(); 781 return true; 782 } 783 case BinaryOperatorClass: { 784 const BinaryOperator *BO = cast<BinaryOperator>(this); 785 // Consider comma to have side effects if the LHS or RHS does. 786 if (BO->getOpcode() == BinaryOperator::Comma) 787 return (BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 788 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 789 790 if (BO->isAssignmentOp()) 791 return false; 792 Loc = BO->getOperatorLoc(); 793 R1 = BO->getLHS()->getSourceRange(); 794 R2 = BO->getRHS()->getSourceRange(); 795 return true; 796 } 797 case CompoundAssignOperatorClass: 798 return false; 799 800 case ConditionalOperatorClass: { 801 // The condition must be evaluated, but if either the LHS or RHS is a 802 // warning, warn about them. 803 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 804 if (Exp->getLHS() && 805 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 806 return true; 807 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 808 } 809 810 case MemberExprClass: 811 // If the base pointer or element is to a volatile pointer/field, accessing 812 // it is a side effect. 813 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 814 return false; 815 Loc = cast<MemberExpr>(this)->getMemberLoc(); 816 R1 = SourceRange(Loc, Loc); 817 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 818 return true; 819 820 case ArraySubscriptExprClass: 821 // If the base pointer or element is to a volatile pointer/field, accessing 822 // it is a side effect. 823 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 824 return false; 825 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 826 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 827 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 828 return true; 829 830 case CallExprClass: 831 case CXXOperatorCallExprClass: 832 case CXXMemberCallExprClass: { 833 // If this is a direct call, get the callee. 834 const CallExpr *CE = cast<CallExpr>(this); 835 if (const FunctionDecl *FD = CE->getDirectCallee()) { 836 // If the callee has attribute pure, const, or warn_unused_result, warn 837 // about it. void foo() { strlen("bar"); } should warn. 838 // 839 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 840 // updated to match for QoI. 841 if (FD->getAttr<WarnUnusedResultAttr>() || 842 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 843 Loc = CE->getCallee()->getLocStart(); 844 R1 = CE->getCallee()->getSourceRange(); 845 846 if (unsigned NumArgs = CE->getNumArgs()) 847 R2 = SourceRange(CE->getArg(0)->getLocStart(), 848 CE->getArg(NumArgs-1)->getLocEnd()); 849 return true; 850 } 851 } 852 return false; 853 } 854 855 case CXXTemporaryObjectExprClass: 856 case CXXConstructExprClass: 857 return false; 858 859 case ObjCMessageExprClass: 860 return false; 861 862 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 863#if 0 864 const ObjCImplicitSetterGetterRefExpr *Ref = 865 cast<ObjCImplicitSetterGetterRefExpr>(this); 866 // FIXME: We really want the location of the '.' here. 867 Loc = Ref->getLocation(); 868 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 869 if (Ref->getBase()) 870 R2 = Ref->getBase()->getSourceRange(); 871#else 872 Loc = getExprLoc(); 873 R1 = getSourceRange(); 874#endif 875 return true; 876 } 877 case StmtExprClass: { 878 // Statement exprs don't logically have side effects themselves, but are 879 // sometimes used in macros in ways that give them a type that is unused. 880 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 881 // however, if the result of the stmt expr is dead, we don't want to emit a 882 // warning. 883 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 884 if (!CS->body_empty()) 885 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 886 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 887 888 Loc = cast<StmtExpr>(this)->getLParenLoc(); 889 R1 = getSourceRange(); 890 return true; 891 } 892 case CStyleCastExprClass: 893 // If this is an explicit cast to void, allow it. People do this when they 894 // think they know what they're doing :). 895 if (getType()->isVoidType()) 896 return false; 897 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 898 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 899 return true; 900 case CXXFunctionalCastExprClass: { 901 const CastExpr *CE = cast<CastExpr>(this); 902 903 // If this is a cast to void or a constructor conversion, check the operand. 904 // Otherwise, the result of the cast is unused. 905 if (CE->getCastKind() == CastExpr::CK_ToVoid || 906 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 907 return (cast<CastExpr>(this)->getSubExpr() 908 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 909 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 910 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 911 return true; 912 } 913 914 case ImplicitCastExprClass: 915 // Check the operand, since implicit casts are inserted by Sema 916 return (cast<ImplicitCastExpr>(this) 917 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 918 919 case CXXDefaultArgExprClass: 920 return (cast<CXXDefaultArgExpr>(this) 921 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 922 923 case CXXNewExprClass: 924 // FIXME: In theory, there might be new expressions that don't have side 925 // effects (e.g. a placement new with an uninitialized POD). 926 case CXXDeleteExprClass: 927 return false; 928 case CXXBindTemporaryExprClass: 929 return (cast<CXXBindTemporaryExpr>(this) 930 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 931 case CXXExprWithTemporariesClass: 932 return (cast<CXXExprWithTemporaries>(this) 933 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 934 } 935} 936 937/// DeclCanBeLvalue - Determine whether the given declaration can be 938/// an lvalue. This is a helper routine for isLvalue. 939static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 940 // C++ [temp.param]p6: 941 // A non-type non-reference template-parameter is not an lvalue. 942 if (const NonTypeTemplateParmDecl *NTTParm 943 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 944 return NTTParm->getType()->isReferenceType(); 945 946 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 947 // C++ 3.10p2: An lvalue refers to an object or function. 948 (Ctx.getLangOptions().CPlusPlus && 949 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 950} 951 952/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 953/// incomplete type other than void. Nonarray expressions that can be lvalues: 954/// - name, where name must be a variable 955/// - e[i] 956/// - (e), where e must be an lvalue 957/// - e.name, where e must be an lvalue 958/// - e->name 959/// - *e, the type of e cannot be a function type 960/// - string-constant 961/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 962/// - reference type [C++ [expr]] 963/// 964Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 965 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 966 967 isLvalueResult Res = isLvalueInternal(Ctx); 968 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 969 return Res; 970 971 // first, check the type (C99 6.3.2.1). Expressions with function 972 // type in C are not lvalues, but they can be lvalues in C++. 973 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 974 return LV_NotObjectType; 975 976 // Allow qualified void which is an incomplete type other than void (yuck). 977 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 978 return LV_IncompleteVoidType; 979 980 return LV_Valid; 981} 982 983// Check whether the expression can be sanely treated like an l-value 984Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 985 switch (getStmtClass()) { 986 case ObjCIsaExprClass: 987 case StringLiteralClass: // C99 6.5.1p4 988 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 989 return LV_Valid; 990 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 991 // For vectors, make sure base is an lvalue (i.e. not a function call). 992 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 993 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 994 return LV_Valid; 995 case DeclRefExprClass: { // C99 6.5.1p2 996 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 997 if (DeclCanBeLvalue(RefdDecl, Ctx)) 998 return LV_Valid; 999 break; 1000 } 1001 case BlockDeclRefExprClass: { 1002 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1003 if (isa<VarDecl>(BDR->getDecl())) 1004 return LV_Valid; 1005 break; 1006 } 1007 case MemberExprClass: { 1008 const MemberExpr *m = cast<MemberExpr>(this); 1009 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1010 NamedDecl *Member = m->getMemberDecl(); 1011 // C++ [expr.ref]p4: 1012 // If E2 is declared to have type "reference to T", then E1.E2 1013 // is an lvalue. 1014 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1015 if (Value->getType()->isReferenceType()) 1016 return LV_Valid; 1017 1018 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1019 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1020 return LV_Valid; 1021 1022 // -- If E2 is a non-static data member [...]. If E1 is an 1023 // lvalue, then E1.E2 is an lvalue. 1024 if (isa<FieldDecl>(Member)) 1025 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1026 1027 // -- If it refers to a static member function [...], then 1028 // E1.E2 is an lvalue. 1029 // -- Otherwise, if E1.E2 refers to a non-static member 1030 // function [...], then E1.E2 is not an lvalue. 1031 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1032 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1033 1034 // -- If E2 is a member enumerator [...], the expression E1.E2 1035 // is not an lvalue. 1036 if (isa<EnumConstantDecl>(Member)) 1037 return LV_InvalidExpression; 1038 1039 // Not an lvalue. 1040 return LV_InvalidExpression; 1041 } 1042 1043 // C99 6.5.2.3p4 1044 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 1045 } 1046 case UnaryOperatorClass: 1047 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1048 return LV_Valid; // C99 6.5.3p4 1049 1050 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1051 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1052 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1053 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1054 1055 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1056 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1057 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1058 return LV_Valid; 1059 break; 1060 case ImplicitCastExprClass: 1061 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1062 : LV_InvalidExpression; 1063 case ParenExprClass: // C99 6.5.1p5 1064 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1065 case BinaryOperatorClass: 1066 case CompoundAssignOperatorClass: { 1067 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1068 1069 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1070 BinOp->getOpcode() == BinaryOperator::Comma) 1071 return BinOp->getRHS()->isLvalue(Ctx); 1072 1073 // C++ [expr.mptr.oper]p6 1074 // The result of a .* expression is an lvalue only if its first operand is 1075 // an lvalue and its second operand is a pointer to data member. 1076 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1077 !BinOp->getType()->isFunctionType()) 1078 return BinOp->getLHS()->isLvalue(Ctx); 1079 1080 // The result of an ->* expression is an lvalue only if its second operand 1081 // is a pointer to data member. 1082 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1083 !BinOp->getType()->isFunctionType()) { 1084 QualType Ty = BinOp->getRHS()->getType(); 1085 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1086 return LV_Valid; 1087 } 1088 1089 if (!BinOp->isAssignmentOp()) 1090 return LV_InvalidExpression; 1091 1092 if (Ctx.getLangOptions().CPlusPlus) 1093 // C++ [expr.ass]p1: 1094 // The result of an assignment operation [...] is an lvalue. 1095 return LV_Valid; 1096 1097 1098 // C99 6.5.16: 1099 // An assignment expression [...] is not an lvalue. 1100 return LV_InvalidExpression; 1101 } 1102 case CallExprClass: 1103 case CXXOperatorCallExprClass: 1104 case CXXMemberCallExprClass: { 1105 // C++0x [expr.call]p10 1106 // A function call is an lvalue if and only if the result type 1107 // is an lvalue reference. 1108 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1109 if (ReturnType->isLValueReferenceType()) 1110 return LV_Valid; 1111 1112 break; 1113 } 1114 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1115 return LV_Valid; 1116 case ChooseExprClass: 1117 // __builtin_choose_expr is an lvalue if the selected operand is. 1118 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1119 case ExtVectorElementExprClass: 1120 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1121 return LV_DuplicateVectorComponents; 1122 return LV_Valid; 1123 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1124 return LV_Valid; 1125 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1126 return LV_Valid; 1127 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1128 return LV_Valid; 1129 case PredefinedExprClass: 1130 return LV_Valid; 1131 case UnresolvedLookupExprClass: 1132 return LV_Valid; 1133 case CXXDefaultArgExprClass: 1134 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1135 case CStyleCastExprClass: 1136 case CXXFunctionalCastExprClass: 1137 case CXXStaticCastExprClass: 1138 case CXXDynamicCastExprClass: 1139 case CXXReinterpretCastExprClass: 1140 case CXXConstCastExprClass: 1141 // The result of an explicit cast is an lvalue if the type we are 1142 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1143 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1144 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1145 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1146 isLValueReferenceType()) 1147 return LV_Valid; 1148 break; 1149 case CXXTypeidExprClass: 1150 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1151 return LV_Valid; 1152 case CXXBindTemporaryExprClass: 1153 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1154 isLvalueInternal(Ctx); 1155 case ConditionalOperatorClass: { 1156 // Complicated handling is only for C++. 1157 if (!Ctx.getLangOptions().CPlusPlus) 1158 return LV_InvalidExpression; 1159 1160 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1161 // everywhere there's an object converted to an rvalue. Also, any other 1162 // casts should be wrapped by ImplicitCastExprs. There's just the special 1163 // case involving throws to work out. 1164 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1165 Expr *True = Cond->getTrueExpr(); 1166 Expr *False = Cond->getFalseExpr(); 1167 // C++0x 5.16p2 1168 // If either the second or the third operand has type (cv) void, [...] 1169 // the result [...] is an rvalue. 1170 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1171 return LV_InvalidExpression; 1172 1173 // Both sides must be lvalues for the result to be an lvalue. 1174 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1175 return LV_InvalidExpression; 1176 1177 // That's it. 1178 return LV_Valid; 1179 } 1180 1181 default: 1182 break; 1183 } 1184 return LV_InvalidExpression; 1185} 1186 1187/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1188/// does not have an incomplete type, does not have a const-qualified type, and 1189/// if it is a structure or union, does not have any member (including, 1190/// recursively, any member or element of all contained aggregates or unions) 1191/// with a const-qualified type. 1192Expr::isModifiableLvalueResult 1193Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1194 isLvalueResult lvalResult = isLvalue(Ctx); 1195 1196 switch (lvalResult) { 1197 case LV_Valid: 1198 // C++ 3.10p11: Functions cannot be modified, but pointers to 1199 // functions can be modifiable. 1200 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1201 return MLV_NotObjectType; 1202 break; 1203 1204 case LV_NotObjectType: return MLV_NotObjectType; 1205 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1206 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1207 case LV_InvalidExpression: 1208 // If the top level is a C-style cast, and the subexpression is a valid 1209 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1210 // GCC extension. We don't support it, but we want to produce good 1211 // diagnostics when it happens so that the user knows why. 1212 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1213 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1214 if (Loc) 1215 *Loc = CE->getLParenLoc(); 1216 return MLV_LValueCast; 1217 } 1218 } 1219 return MLV_InvalidExpression; 1220 case LV_MemberFunction: return MLV_MemberFunction; 1221 } 1222 1223 // The following is illegal: 1224 // void takeclosure(void (^C)(void)); 1225 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1226 // 1227 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1228 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1229 return MLV_NotBlockQualified; 1230 } 1231 1232 // Assigning to an 'implicit' property? 1233 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1234 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1235 if (Expr->getSetterMethod() == 0) 1236 return MLV_NoSetterProperty; 1237 } 1238 1239 QualType CT = Ctx.getCanonicalType(getType()); 1240 1241 if (CT.isConstQualified()) 1242 return MLV_ConstQualified; 1243 if (CT->isArrayType()) 1244 return MLV_ArrayType; 1245 if (CT->isIncompleteType()) 1246 return MLV_IncompleteType; 1247 1248 if (const RecordType *r = CT->getAs<RecordType>()) { 1249 if (r->hasConstFields()) 1250 return MLV_ConstQualified; 1251 } 1252 1253 return MLV_Valid; 1254} 1255 1256/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1257/// returns true, if it is; false otherwise. 1258bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1259 switch (getStmtClass()) { 1260 default: 1261 return false; 1262 case ObjCIvarRefExprClass: 1263 return true; 1264 case Expr::UnaryOperatorClass: 1265 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1266 case ParenExprClass: 1267 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1268 case ImplicitCastExprClass: 1269 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1270 case CStyleCastExprClass: 1271 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1272 case DeclRefExprClass: { 1273 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1274 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1275 if (VD->hasGlobalStorage()) 1276 return true; 1277 QualType T = VD->getType(); 1278 // dereferencing to a pointer is always a gc'able candidate, 1279 // unless it is __weak. 1280 return T->isPointerType() && 1281 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1282 } 1283 return false; 1284 } 1285 case MemberExprClass: { 1286 const MemberExpr *M = cast<MemberExpr>(this); 1287 return M->getBase()->isOBJCGCCandidate(Ctx); 1288 } 1289 case ArraySubscriptExprClass: 1290 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1291 } 1292} 1293Expr* Expr::IgnoreParens() { 1294 Expr* E = this; 1295 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1296 E = P->getSubExpr(); 1297 1298 return E; 1299} 1300 1301/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1302/// or CastExprs or ImplicitCastExprs, returning their operand. 1303Expr *Expr::IgnoreParenCasts() { 1304 Expr *E = this; 1305 while (true) { 1306 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1307 E = P->getSubExpr(); 1308 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1309 E = P->getSubExpr(); 1310 else 1311 return E; 1312 } 1313} 1314 1315/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1316/// value (including ptr->int casts of the same size). Strip off any 1317/// ParenExpr or CastExprs, returning their operand. 1318Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1319 Expr *E = this; 1320 while (true) { 1321 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1322 E = P->getSubExpr(); 1323 continue; 1324 } 1325 1326 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1327 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1328 // ptr<->int casts of the same width. We also ignore all identify casts. 1329 Expr *SE = P->getSubExpr(); 1330 1331 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1332 E = SE; 1333 continue; 1334 } 1335 1336 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1337 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1338 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1339 E = SE; 1340 continue; 1341 } 1342 } 1343 1344 return E; 1345 } 1346} 1347 1348 1349/// hasAnyTypeDependentArguments - Determines if any of the expressions 1350/// in Exprs is type-dependent. 1351bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1352 for (unsigned I = 0; I < NumExprs; ++I) 1353 if (Exprs[I]->isTypeDependent()) 1354 return true; 1355 1356 return false; 1357} 1358 1359/// hasAnyValueDependentArguments - Determines if any of the expressions 1360/// in Exprs is value-dependent. 1361bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1362 for (unsigned I = 0; I < NumExprs; ++I) 1363 if (Exprs[I]->isValueDependent()) 1364 return true; 1365 1366 return false; 1367} 1368 1369bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1370 // This function is attempting whether an expression is an initializer 1371 // which can be evaluated at compile-time. isEvaluatable handles most 1372 // of the cases, but it can't deal with some initializer-specific 1373 // expressions, and it can't deal with aggregates; we deal with those here, 1374 // and fall back to isEvaluatable for the other cases. 1375 1376 // FIXME: This function assumes the variable being assigned to 1377 // isn't a reference type! 1378 1379 switch (getStmtClass()) { 1380 default: break; 1381 case StringLiteralClass: 1382 case ObjCStringLiteralClass: 1383 case ObjCEncodeExprClass: 1384 return true; 1385 case CompoundLiteralExprClass: { 1386 // This handles gcc's extension that allows global initializers like 1387 // "struct x {int x;} x = (struct x) {};". 1388 // FIXME: This accepts other cases it shouldn't! 1389 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1390 return Exp->isConstantInitializer(Ctx); 1391 } 1392 case InitListExprClass: { 1393 // FIXME: This doesn't deal with fields with reference types correctly. 1394 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1395 // to bitfields. 1396 const InitListExpr *Exp = cast<InitListExpr>(this); 1397 unsigned numInits = Exp->getNumInits(); 1398 for (unsigned i = 0; i < numInits; i++) { 1399 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1400 return false; 1401 } 1402 return true; 1403 } 1404 case ImplicitValueInitExprClass: 1405 return true; 1406 case ParenExprClass: 1407 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1408 case UnaryOperatorClass: { 1409 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1410 if (Exp->getOpcode() == UnaryOperator::Extension) 1411 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1412 break; 1413 } 1414 case BinaryOperatorClass: { 1415 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1416 // but this handles the common case. 1417 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1418 if (Exp->getOpcode() == BinaryOperator::Sub && 1419 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1420 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1421 return true; 1422 break; 1423 } 1424 case ImplicitCastExprClass: 1425 case CStyleCastExprClass: 1426 // Handle casts with a destination that's a struct or union; this 1427 // deals with both the gcc no-op struct cast extension and the 1428 // cast-to-union extension. 1429 if (getType()->isRecordType()) 1430 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1431 1432 // Integer->integer casts can be handled here, which is important for 1433 // things like (int)(&&x-&&y). Scary but true. 1434 if (getType()->isIntegerType() && 1435 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1436 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1437 1438 break; 1439 } 1440 return isEvaluatable(Ctx); 1441} 1442 1443/// isIntegerConstantExpr - this recursive routine will test if an expression is 1444/// an integer constant expression. 1445 1446/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1447/// comma, etc 1448/// 1449/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1450/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1451/// cast+dereference. 1452 1453// CheckICE - This function does the fundamental ICE checking: the returned 1454// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1455// Note that to reduce code duplication, this helper does no evaluation 1456// itself; the caller checks whether the expression is evaluatable, and 1457// in the rare cases where CheckICE actually cares about the evaluated 1458// value, it calls into Evalute. 1459// 1460// Meanings of Val: 1461// 0: This expression is an ICE if it can be evaluated by Evaluate. 1462// 1: This expression is not an ICE, but if it isn't evaluated, it's 1463// a legal subexpression for an ICE. This return value is used to handle 1464// the comma operator in C99 mode. 1465// 2: This expression is not an ICE, and is not a legal subexpression for one. 1466 1467struct ICEDiag { 1468 unsigned Val; 1469 SourceLocation Loc; 1470 1471 public: 1472 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1473 ICEDiag() : Val(0) {} 1474}; 1475 1476ICEDiag NoDiag() { return ICEDiag(); } 1477 1478static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1479 Expr::EvalResult EVResult; 1480 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1481 !EVResult.Val.isInt()) { 1482 return ICEDiag(2, E->getLocStart()); 1483 } 1484 return NoDiag(); 1485} 1486 1487static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1488 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1489 if (!E->getType()->isIntegralType()) { 1490 return ICEDiag(2, E->getLocStart()); 1491 } 1492 1493 switch (E->getStmtClass()) { 1494#define STMT(Node, Base) case Expr::Node##Class: 1495#define EXPR(Node, Base) 1496#include "clang/AST/StmtNodes.def" 1497 case Expr::PredefinedExprClass: 1498 case Expr::FloatingLiteralClass: 1499 case Expr::ImaginaryLiteralClass: 1500 case Expr::StringLiteralClass: 1501 case Expr::ArraySubscriptExprClass: 1502 case Expr::MemberExprClass: 1503 case Expr::CompoundAssignOperatorClass: 1504 case Expr::CompoundLiteralExprClass: 1505 case Expr::ExtVectorElementExprClass: 1506 case Expr::InitListExprClass: 1507 case Expr::DesignatedInitExprClass: 1508 case Expr::ImplicitValueInitExprClass: 1509 case Expr::ParenListExprClass: 1510 case Expr::VAArgExprClass: 1511 case Expr::AddrLabelExprClass: 1512 case Expr::StmtExprClass: 1513 case Expr::CXXMemberCallExprClass: 1514 case Expr::CXXDynamicCastExprClass: 1515 case Expr::CXXTypeidExprClass: 1516 case Expr::CXXNullPtrLiteralExprClass: 1517 case Expr::CXXThisExprClass: 1518 case Expr::CXXThrowExprClass: 1519 case Expr::CXXNewExprClass: 1520 case Expr::CXXDeleteExprClass: 1521 case Expr::CXXPseudoDestructorExprClass: 1522 case Expr::UnresolvedLookupExprClass: 1523 case Expr::DependentScopeDeclRefExprClass: 1524 case Expr::CXXConstructExprClass: 1525 case Expr::CXXBindTemporaryExprClass: 1526 case Expr::CXXExprWithTemporariesClass: 1527 case Expr::CXXTemporaryObjectExprClass: 1528 case Expr::CXXUnresolvedConstructExprClass: 1529 case Expr::CXXDependentScopeMemberExprClass: 1530 case Expr::UnresolvedMemberExprClass: 1531 case Expr::ObjCStringLiteralClass: 1532 case Expr::ObjCEncodeExprClass: 1533 case Expr::ObjCMessageExprClass: 1534 case Expr::ObjCSelectorExprClass: 1535 case Expr::ObjCProtocolExprClass: 1536 case Expr::ObjCIvarRefExprClass: 1537 case Expr::ObjCPropertyRefExprClass: 1538 case Expr::ObjCImplicitSetterGetterRefExprClass: 1539 case Expr::ObjCSuperExprClass: 1540 case Expr::ObjCIsaExprClass: 1541 case Expr::ShuffleVectorExprClass: 1542 case Expr::BlockExprClass: 1543 case Expr::BlockDeclRefExprClass: 1544 case Expr::NoStmtClass: 1545 case Expr::ExprClass: 1546 return ICEDiag(2, E->getLocStart()); 1547 1548 case Expr::GNUNullExprClass: 1549 // GCC considers the GNU __null value to be an integral constant expression. 1550 return NoDiag(); 1551 1552 case Expr::ParenExprClass: 1553 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1554 case Expr::IntegerLiteralClass: 1555 case Expr::CharacterLiteralClass: 1556 case Expr::CXXBoolLiteralExprClass: 1557 case Expr::CXXZeroInitValueExprClass: 1558 case Expr::TypesCompatibleExprClass: 1559 case Expr::UnaryTypeTraitExprClass: 1560 return NoDiag(); 1561 case Expr::CallExprClass: 1562 case Expr::CXXOperatorCallExprClass: { 1563 const CallExpr *CE = cast<CallExpr>(E); 1564 if (CE->isBuiltinCall(Ctx)) 1565 return CheckEvalInICE(E, Ctx); 1566 return ICEDiag(2, E->getLocStart()); 1567 } 1568 case Expr::DeclRefExprClass: 1569 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1570 return NoDiag(); 1571 if (Ctx.getLangOptions().CPlusPlus && 1572 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1573 // C++ 7.1.5.1p2 1574 // A variable of non-volatile const-qualified integral or enumeration 1575 // type initialized by an ICE can be used in ICEs. 1576 if (const VarDecl *Dcl = 1577 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1578 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers(); 1579 if (Quals.hasVolatile() || !Quals.hasConst()) 1580 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1581 1582 // Look for the definition of this variable, which will actually have 1583 // an initializer. 1584 const VarDecl *Def = 0; 1585 const Expr *Init = Dcl->getDefinition(Def); 1586 if (Init) { 1587 if (Def->isInitKnownICE()) { 1588 // We have already checked whether this subexpression is an 1589 // integral constant expression. 1590 if (Def->isInitICE()) 1591 return NoDiag(); 1592 else 1593 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1594 } 1595 1596 // C++ [class.static.data]p4: 1597 // If a static data member is of const integral or const 1598 // enumeration type, its declaration in the class definition can 1599 // specify a constant-initializer which shall be an integral 1600 // constant expression (5.19). In that case, the member can appear 1601 // in integral constant expressions. 1602 if (Def->isOutOfLine()) { 1603 Dcl->setInitKnownICE(false); 1604 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1605 } 1606 1607 if (Dcl->isCheckingICE()) { 1608 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 1609 } 1610 1611 Dcl->setCheckingICE(); 1612 ICEDiag Result = CheckICE(Init, Ctx); 1613 // Cache the result of the ICE test. 1614 Dcl->setInitKnownICE(Result.Val == 0); 1615 return Result; 1616 } 1617 } 1618 } 1619 return ICEDiag(2, E->getLocStart()); 1620 case Expr::UnaryOperatorClass: { 1621 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1622 switch (Exp->getOpcode()) { 1623 case UnaryOperator::PostInc: 1624 case UnaryOperator::PostDec: 1625 case UnaryOperator::PreInc: 1626 case UnaryOperator::PreDec: 1627 case UnaryOperator::AddrOf: 1628 case UnaryOperator::Deref: 1629 return ICEDiag(2, E->getLocStart()); 1630 1631 case UnaryOperator::Extension: 1632 case UnaryOperator::LNot: 1633 case UnaryOperator::Plus: 1634 case UnaryOperator::Minus: 1635 case UnaryOperator::Not: 1636 case UnaryOperator::Real: 1637 case UnaryOperator::Imag: 1638 return CheckICE(Exp->getSubExpr(), Ctx); 1639 case UnaryOperator::OffsetOf: 1640 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1641 // Evaluate matches the proposed gcc behavior for cases like 1642 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1643 // compliance: we should warn earlier for offsetof expressions with 1644 // array subscripts that aren't ICEs, and if the array subscripts 1645 // are ICEs, the value of the offsetof must be an integer constant. 1646 return CheckEvalInICE(E, Ctx); 1647 } 1648 } 1649 case Expr::SizeOfAlignOfExprClass: { 1650 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1651 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1652 return ICEDiag(2, E->getLocStart()); 1653 return NoDiag(); 1654 } 1655 case Expr::BinaryOperatorClass: { 1656 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1657 switch (Exp->getOpcode()) { 1658 case BinaryOperator::PtrMemD: 1659 case BinaryOperator::PtrMemI: 1660 case BinaryOperator::Assign: 1661 case BinaryOperator::MulAssign: 1662 case BinaryOperator::DivAssign: 1663 case BinaryOperator::RemAssign: 1664 case BinaryOperator::AddAssign: 1665 case BinaryOperator::SubAssign: 1666 case BinaryOperator::ShlAssign: 1667 case BinaryOperator::ShrAssign: 1668 case BinaryOperator::AndAssign: 1669 case BinaryOperator::XorAssign: 1670 case BinaryOperator::OrAssign: 1671 return ICEDiag(2, E->getLocStart()); 1672 1673 case BinaryOperator::Mul: 1674 case BinaryOperator::Div: 1675 case BinaryOperator::Rem: 1676 case BinaryOperator::Add: 1677 case BinaryOperator::Sub: 1678 case BinaryOperator::Shl: 1679 case BinaryOperator::Shr: 1680 case BinaryOperator::LT: 1681 case BinaryOperator::GT: 1682 case BinaryOperator::LE: 1683 case BinaryOperator::GE: 1684 case BinaryOperator::EQ: 1685 case BinaryOperator::NE: 1686 case BinaryOperator::And: 1687 case BinaryOperator::Xor: 1688 case BinaryOperator::Or: 1689 case BinaryOperator::Comma: { 1690 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1691 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1692 if (Exp->getOpcode() == BinaryOperator::Div || 1693 Exp->getOpcode() == BinaryOperator::Rem) { 1694 // Evaluate gives an error for undefined Div/Rem, so make sure 1695 // we don't evaluate one. 1696 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1697 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1698 if (REval == 0) 1699 return ICEDiag(1, E->getLocStart()); 1700 if (REval.isSigned() && REval.isAllOnesValue()) { 1701 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1702 if (LEval.isMinSignedValue()) 1703 return ICEDiag(1, E->getLocStart()); 1704 } 1705 } 1706 } 1707 if (Exp->getOpcode() == BinaryOperator::Comma) { 1708 if (Ctx.getLangOptions().C99) { 1709 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1710 // if it isn't evaluated. 1711 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1712 return ICEDiag(1, E->getLocStart()); 1713 } else { 1714 // In both C89 and C++, commas in ICEs are illegal. 1715 return ICEDiag(2, E->getLocStart()); 1716 } 1717 } 1718 if (LHSResult.Val >= RHSResult.Val) 1719 return LHSResult; 1720 return RHSResult; 1721 } 1722 case BinaryOperator::LAnd: 1723 case BinaryOperator::LOr: { 1724 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1725 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1726 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1727 // Rare case where the RHS has a comma "side-effect"; we need 1728 // to actually check the condition to see whether the side 1729 // with the comma is evaluated. 1730 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1731 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1732 return RHSResult; 1733 return NoDiag(); 1734 } 1735 1736 if (LHSResult.Val >= RHSResult.Val) 1737 return LHSResult; 1738 return RHSResult; 1739 } 1740 } 1741 } 1742 case Expr::CastExprClass: 1743 case Expr::ImplicitCastExprClass: 1744 case Expr::ExplicitCastExprClass: 1745 case Expr::CStyleCastExprClass: 1746 case Expr::CXXFunctionalCastExprClass: 1747 case Expr::CXXNamedCastExprClass: 1748 case Expr::CXXStaticCastExprClass: 1749 case Expr::CXXReinterpretCastExprClass: 1750 case Expr::CXXConstCastExprClass: { 1751 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1752 if (SubExpr->getType()->isIntegralType()) 1753 return CheckICE(SubExpr, Ctx); 1754 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1755 return NoDiag(); 1756 return ICEDiag(2, E->getLocStart()); 1757 } 1758 case Expr::ConditionalOperatorClass: { 1759 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1760 // If the condition (ignoring parens) is a __builtin_constant_p call, 1761 // then only the true side is actually considered in an integer constant 1762 // expression, and it is fully evaluated. This is an important GNU 1763 // extension. See GCC PR38377 for discussion. 1764 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1765 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1766 Expr::EvalResult EVResult; 1767 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1768 !EVResult.Val.isInt()) { 1769 return ICEDiag(2, E->getLocStart()); 1770 } 1771 return NoDiag(); 1772 } 1773 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1774 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1775 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1776 if (CondResult.Val == 2) 1777 return CondResult; 1778 if (TrueResult.Val == 2) 1779 return TrueResult; 1780 if (FalseResult.Val == 2) 1781 return FalseResult; 1782 if (CondResult.Val == 1) 1783 return CondResult; 1784 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1785 return NoDiag(); 1786 // Rare case where the diagnostics depend on which side is evaluated 1787 // Note that if we get here, CondResult is 0, and at least one of 1788 // TrueResult and FalseResult is non-zero. 1789 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1790 return FalseResult; 1791 } 1792 return TrueResult; 1793 } 1794 case Expr::CXXDefaultArgExprClass: 1795 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1796 case Expr::ChooseExprClass: { 1797 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1798 } 1799 } 1800 1801 // Silence a GCC warning 1802 return ICEDiag(2, E->getLocStart()); 1803} 1804 1805bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1806 SourceLocation *Loc, bool isEvaluated) const { 1807 ICEDiag d = CheckICE(this, Ctx); 1808 if (d.Val != 0) { 1809 if (Loc) *Loc = d.Loc; 1810 return false; 1811 } 1812 EvalResult EvalResult; 1813 if (!Evaluate(EvalResult, Ctx)) 1814 llvm::llvm_unreachable("ICE cannot be evaluated!"); 1815 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1816 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1817 Result = EvalResult.Val.getInt(); 1818 return true; 1819} 1820 1821/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1822/// integer constant expression with the value zero, or if this is one that is 1823/// cast to void*. 1824bool Expr::isNullPointerConstant(ASTContext &Ctx, 1825 NullPointerConstantValueDependence NPC) const { 1826 if (isValueDependent()) { 1827 switch (NPC) { 1828 case NPC_NeverValueDependent: 1829 assert(false && "Unexpected value dependent expression!"); 1830 // If the unthinkable happens, fall through to the safest alternative. 1831 1832 case NPC_ValueDependentIsNull: 1833 return isTypeDependent() || getType()->isIntegralType(); 1834 1835 case NPC_ValueDependentIsNotNull: 1836 return false; 1837 } 1838 } 1839 1840 // Strip off a cast to void*, if it exists. Except in C++. 1841 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1842 if (!Ctx.getLangOptions().CPlusPlus) { 1843 // Check that it is a cast to void*. 1844 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1845 QualType Pointee = PT->getPointeeType(); 1846 if (!Pointee.hasQualifiers() && 1847 Pointee->isVoidType() && // to void* 1848 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1849 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1850 } 1851 } 1852 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1853 // Ignore the ImplicitCastExpr type entirely. 1854 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1855 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1856 // Accept ((void*)0) as a null pointer constant, as many other 1857 // implementations do. 1858 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1859 } else if (const CXXDefaultArgExpr *DefaultArg 1860 = dyn_cast<CXXDefaultArgExpr>(this)) { 1861 // See through default argument expressions 1862 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1863 } else if (isa<GNUNullExpr>(this)) { 1864 // The GNU __null extension is always a null pointer constant. 1865 return true; 1866 } 1867 1868 // C++0x nullptr_t is always a null pointer constant. 1869 if (getType()->isNullPtrType()) 1870 return true; 1871 1872 // This expression must be an integer type. 1873 if (!getType()->isIntegerType() || 1874 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1875 return false; 1876 1877 // If we have an integer constant expression, we need to *evaluate* it and 1878 // test for the value 0. 1879 llvm::APSInt Result; 1880 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1881} 1882 1883FieldDecl *Expr::getBitField() { 1884 Expr *E = this->IgnoreParens(); 1885 1886 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1887 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1888 if (Field->isBitField()) 1889 return Field; 1890 1891 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1892 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1893 return BinOp->getLHS()->getBitField(); 1894 1895 return 0; 1896} 1897 1898/// isArrow - Return true if the base expression is a pointer to vector, 1899/// return false if the base expression is a vector. 1900bool ExtVectorElementExpr::isArrow() const { 1901 return getBase()->getType()->isPointerType(); 1902} 1903 1904unsigned ExtVectorElementExpr::getNumElements() const { 1905 if (const VectorType *VT = getType()->getAs<VectorType>()) 1906 return VT->getNumElements(); 1907 return 1; 1908} 1909 1910/// containsDuplicateElements - Return true if any element access is repeated. 1911bool ExtVectorElementExpr::containsDuplicateElements() const { 1912 // FIXME: Refactor this code to an accessor on the AST node which returns the 1913 // "type" of component access, and share with code below and in Sema. 1914 llvm::StringRef Comp = Accessor->getName(); 1915 1916 // Halving swizzles do not contain duplicate elements. 1917 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1918 return false; 1919 1920 // Advance past s-char prefix on hex swizzles. 1921 if (Comp[0] == 's' || Comp[0] == 'S') 1922 Comp = Comp.substr(1); 1923 1924 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1925 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1926 return true; 1927 1928 return false; 1929} 1930 1931/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1932void ExtVectorElementExpr::getEncodedElementAccess( 1933 llvm::SmallVectorImpl<unsigned> &Elts) const { 1934 llvm::StringRef Comp = Accessor->getName(); 1935 if (Comp[0] == 's' || Comp[0] == 'S') 1936 Comp = Comp.substr(1); 1937 1938 bool isHi = Comp == "hi"; 1939 bool isLo = Comp == "lo"; 1940 bool isEven = Comp == "even"; 1941 bool isOdd = Comp == "odd"; 1942 1943 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1944 uint64_t Index; 1945 1946 if (isHi) 1947 Index = e + i; 1948 else if (isLo) 1949 Index = i; 1950 else if (isEven) 1951 Index = 2 * i; 1952 else if (isOdd) 1953 Index = 2 * i + 1; 1954 else 1955 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1956 1957 Elts.push_back(Index); 1958 } 1959} 1960 1961// constructor for instance messages. 1962ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1963 QualType retType, ObjCMethodDecl *mproto, 1964 SourceLocation LBrac, SourceLocation RBrac, 1965 Expr **ArgExprs, unsigned nargs) 1966 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1967 MethodProto(mproto) { 1968 NumArgs = nargs; 1969 SubExprs = new Stmt*[NumArgs+1]; 1970 SubExprs[RECEIVER] = receiver; 1971 if (NumArgs) { 1972 for (unsigned i = 0; i != NumArgs; ++i) 1973 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1974 } 1975 LBracloc = LBrac; 1976 RBracloc = RBrac; 1977} 1978 1979// constructor for class messages. 1980// FIXME: clsName should be typed to ObjCInterfaceType 1981ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1982 QualType retType, ObjCMethodDecl *mproto, 1983 SourceLocation LBrac, SourceLocation RBrac, 1984 Expr **ArgExprs, unsigned nargs) 1985 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1986 MethodProto(mproto) { 1987 NumArgs = nargs; 1988 SubExprs = new Stmt*[NumArgs+1]; 1989 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1990 if (NumArgs) { 1991 for (unsigned i = 0; i != NumArgs; ++i) 1992 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1993 } 1994 LBracloc = LBrac; 1995 RBracloc = RBrac; 1996} 1997 1998// constructor for class messages. 1999ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 2000 QualType retType, ObjCMethodDecl *mproto, 2001 SourceLocation LBrac, SourceLocation RBrac, 2002 Expr **ArgExprs, unsigned nargs) 2003: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 2004MethodProto(mproto) { 2005 NumArgs = nargs; 2006 SubExprs = new Stmt*[NumArgs+1]; 2007 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 2008 if (NumArgs) { 2009 for (unsigned i = 0; i != NumArgs; ++i) 2010 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 2011 } 2012 LBracloc = LBrac; 2013 RBracloc = RBrac; 2014} 2015 2016ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 2017 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 2018 switch (x & Flags) { 2019 default: 2020 assert(false && "Invalid ObjCMessageExpr."); 2021 case IsInstMeth: 2022 return ClassInfo(0, 0); 2023 case IsClsMethDeclUnknown: 2024 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 2025 case IsClsMethDeclKnown: { 2026 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 2027 return ClassInfo(D, D->getIdentifier()); 2028 } 2029 } 2030} 2031 2032void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 2033 if (CI.first == 0 && CI.second == 0) 2034 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 2035 else if (CI.first == 0) 2036 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 2037 else 2038 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 2039} 2040 2041 2042bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2043 return getCond()->EvaluateAsInt(C) != 0; 2044} 2045 2046void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2047 unsigned NumExprs) { 2048 if (SubExprs) C.Deallocate(SubExprs); 2049 2050 SubExprs = new (C) Stmt* [NumExprs]; 2051 this->NumExprs = NumExprs; 2052 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2053} 2054 2055void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2056 DestroyChildren(C); 2057 if (SubExprs) C.Deallocate(SubExprs); 2058 this->~ShuffleVectorExpr(); 2059 C.Deallocate(this); 2060} 2061 2062void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2063 // Override default behavior of traversing children. If this has a type 2064 // operand and the type is a variable-length array, the child iteration 2065 // will iterate over the size expression. However, this expression belongs 2066 // to the type, not to this, so we don't want to delete it. 2067 // We still want to delete this expression. 2068 if (isArgumentType()) { 2069 this->~SizeOfAlignOfExpr(); 2070 C.Deallocate(this); 2071 } 2072 else 2073 Expr::DoDestroy(C); 2074} 2075 2076//===----------------------------------------------------------------------===// 2077// DesignatedInitExpr 2078//===----------------------------------------------------------------------===// 2079 2080IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2081 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2082 if (Field.NameOrField & 0x01) 2083 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2084 else 2085 return getField()->getIdentifier(); 2086} 2087 2088DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2089 const Designator *Designators, 2090 SourceLocation EqualOrColonLoc, 2091 bool GNUSyntax, 2092 Expr **IndexExprs, 2093 unsigned NumIndexExprs, 2094 Expr *Init) 2095 : Expr(DesignatedInitExprClass, Ty, 2096 Init->isTypeDependent(), Init->isValueDependent()), 2097 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2098 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2099 this->Designators = new Designator[NumDesignators]; 2100 2101 // Record the initializer itself. 2102 child_iterator Child = child_begin(); 2103 *Child++ = Init; 2104 2105 // Copy the designators and their subexpressions, computing 2106 // value-dependence along the way. 2107 unsigned IndexIdx = 0; 2108 for (unsigned I = 0; I != NumDesignators; ++I) { 2109 this->Designators[I] = Designators[I]; 2110 2111 if (this->Designators[I].isArrayDesignator()) { 2112 // Compute type- and value-dependence. 2113 Expr *Index = IndexExprs[IndexIdx]; 2114 ValueDependent = ValueDependent || 2115 Index->isTypeDependent() || Index->isValueDependent(); 2116 2117 // Copy the index expressions into permanent storage. 2118 *Child++ = IndexExprs[IndexIdx++]; 2119 } else if (this->Designators[I].isArrayRangeDesignator()) { 2120 // Compute type- and value-dependence. 2121 Expr *Start = IndexExprs[IndexIdx]; 2122 Expr *End = IndexExprs[IndexIdx + 1]; 2123 ValueDependent = ValueDependent || 2124 Start->isTypeDependent() || Start->isValueDependent() || 2125 End->isTypeDependent() || End->isValueDependent(); 2126 2127 // Copy the start/end expressions into permanent storage. 2128 *Child++ = IndexExprs[IndexIdx++]; 2129 *Child++ = IndexExprs[IndexIdx++]; 2130 } 2131 } 2132 2133 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2134} 2135 2136DesignatedInitExpr * 2137DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2138 unsigned NumDesignators, 2139 Expr **IndexExprs, unsigned NumIndexExprs, 2140 SourceLocation ColonOrEqualLoc, 2141 bool UsesColonSyntax, Expr *Init) { 2142 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2143 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2144 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2145 ColonOrEqualLoc, UsesColonSyntax, 2146 IndexExprs, NumIndexExprs, Init); 2147} 2148 2149DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2150 unsigned NumIndexExprs) { 2151 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2152 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2153 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2154} 2155 2156void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2157 unsigned NumDesigs) { 2158 if (Designators) 2159 delete [] Designators; 2160 2161 Designators = new Designator[NumDesigs]; 2162 NumDesignators = NumDesigs; 2163 for (unsigned I = 0; I != NumDesigs; ++I) 2164 Designators[I] = Desigs[I]; 2165} 2166 2167SourceRange DesignatedInitExpr::getSourceRange() const { 2168 SourceLocation StartLoc; 2169 Designator &First = 2170 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2171 if (First.isFieldDesignator()) { 2172 if (GNUSyntax) 2173 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2174 else 2175 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2176 } else 2177 StartLoc = 2178 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2179 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2180} 2181 2182Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2183 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2184 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2185 Ptr += sizeof(DesignatedInitExpr); 2186 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2187 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2188} 2189 2190Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2191 assert(D.Kind == Designator::ArrayRangeDesignator && 2192 "Requires array range designator"); 2193 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2194 Ptr += sizeof(DesignatedInitExpr); 2195 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2196 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2197} 2198 2199Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2200 assert(D.Kind == Designator::ArrayRangeDesignator && 2201 "Requires array range designator"); 2202 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2203 Ptr += sizeof(DesignatedInitExpr); 2204 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2205 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2206} 2207 2208/// \brief Replaces the designator at index @p Idx with the series 2209/// of designators in [First, Last). 2210void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2211 const Designator *First, 2212 const Designator *Last) { 2213 unsigned NumNewDesignators = Last - First; 2214 if (NumNewDesignators == 0) { 2215 std::copy_backward(Designators + Idx + 1, 2216 Designators + NumDesignators, 2217 Designators + Idx); 2218 --NumNewDesignators; 2219 return; 2220 } else if (NumNewDesignators == 1) { 2221 Designators[Idx] = *First; 2222 return; 2223 } 2224 2225 Designator *NewDesignators 2226 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2227 std::copy(Designators, Designators + Idx, NewDesignators); 2228 std::copy(First, Last, NewDesignators + Idx); 2229 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2230 NewDesignators + Idx + NumNewDesignators); 2231 delete [] Designators; 2232 Designators = NewDesignators; 2233 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2234} 2235 2236void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2237 delete [] Designators; 2238 Expr::DoDestroy(C); 2239} 2240 2241ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2242 Expr **exprs, unsigned nexprs, 2243 SourceLocation rparenloc) 2244: Expr(ParenListExprClass, QualType(), 2245 hasAnyTypeDependentArguments(exprs, nexprs), 2246 hasAnyValueDependentArguments(exprs, nexprs)), 2247 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2248 2249 Exprs = new (C) Stmt*[nexprs]; 2250 for (unsigned i = 0; i != nexprs; ++i) 2251 Exprs[i] = exprs[i]; 2252} 2253 2254void ParenListExpr::DoDestroy(ASTContext& C) { 2255 DestroyChildren(C); 2256 if (Exprs) C.Deallocate(Exprs); 2257 this->~ParenListExpr(); 2258 C.Deallocate(this); 2259} 2260 2261//===----------------------------------------------------------------------===// 2262// ExprIterator. 2263//===----------------------------------------------------------------------===// 2264 2265Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2266Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2267Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2268const Expr* ConstExprIterator::operator[](size_t idx) const { 2269 return cast<Expr>(I[idx]); 2270} 2271const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2272const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2273 2274//===----------------------------------------------------------------------===// 2275// Child Iterators for iterating over subexpressions/substatements 2276//===----------------------------------------------------------------------===// 2277 2278// DeclRefExpr 2279Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2280Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2281 2282// ObjCIvarRefExpr 2283Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2284Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2285 2286// ObjCPropertyRefExpr 2287Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2288Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2289 2290// ObjCImplicitSetterGetterRefExpr 2291Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2292 return &Base; 2293} 2294Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2295 return &Base+1; 2296} 2297 2298// ObjCSuperExpr 2299Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2300Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2301 2302// ObjCIsaExpr 2303Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2304Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2305 2306// PredefinedExpr 2307Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2308Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2309 2310// IntegerLiteral 2311Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2312Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2313 2314// CharacterLiteral 2315Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2316Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2317 2318// FloatingLiteral 2319Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2320Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2321 2322// ImaginaryLiteral 2323Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2324Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2325 2326// StringLiteral 2327Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2328Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2329 2330// ParenExpr 2331Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2332Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2333 2334// UnaryOperator 2335Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2336Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2337 2338// SizeOfAlignOfExpr 2339Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2340 // If this is of a type and the type is a VLA type (and not a typedef), the 2341 // size expression of the VLA needs to be treated as an executable expression. 2342 // Why isn't this weirdness documented better in StmtIterator? 2343 if (isArgumentType()) { 2344 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2345 getArgumentType().getTypePtr())) 2346 return child_iterator(T); 2347 return child_iterator(); 2348 } 2349 return child_iterator(&Argument.Ex); 2350} 2351Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2352 if (isArgumentType()) 2353 return child_iterator(); 2354 return child_iterator(&Argument.Ex + 1); 2355} 2356 2357// ArraySubscriptExpr 2358Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2359 return &SubExprs[0]; 2360} 2361Stmt::child_iterator ArraySubscriptExpr::child_end() { 2362 return &SubExprs[0]+END_EXPR; 2363} 2364 2365// CallExpr 2366Stmt::child_iterator CallExpr::child_begin() { 2367 return &SubExprs[0]; 2368} 2369Stmt::child_iterator CallExpr::child_end() { 2370 return &SubExprs[0]+NumArgs+ARGS_START; 2371} 2372 2373// MemberExpr 2374Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2375Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2376 2377// ExtVectorElementExpr 2378Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2379Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2380 2381// CompoundLiteralExpr 2382Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2383Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2384 2385// CastExpr 2386Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2387Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2388 2389// BinaryOperator 2390Stmt::child_iterator BinaryOperator::child_begin() { 2391 return &SubExprs[0]; 2392} 2393Stmt::child_iterator BinaryOperator::child_end() { 2394 return &SubExprs[0]+END_EXPR; 2395} 2396 2397// ConditionalOperator 2398Stmt::child_iterator ConditionalOperator::child_begin() { 2399 return &SubExprs[0]; 2400} 2401Stmt::child_iterator ConditionalOperator::child_end() { 2402 return &SubExprs[0]+END_EXPR; 2403} 2404 2405// AddrLabelExpr 2406Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2407Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2408 2409// StmtExpr 2410Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2411Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2412 2413// TypesCompatibleExpr 2414Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2415 return child_iterator(); 2416} 2417 2418Stmt::child_iterator TypesCompatibleExpr::child_end() { 2419 return child_iterator(); 2420} 2421 2422// ChooseExpr 2423Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2424Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2425 2426// GNUNullExpr 2427Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2428Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2429 2430// ShuffleVectorExpr 2431Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2432 return &SubExprs[0]; 2433} 2434Stmt::child_iterator ShuffleVectorExpr::child_end() { 2435 return &SubExprs[0]+NumExprs; 2436} 2437 2438// VAArgExpr 2439Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2440Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2441 2442// InitListExpr 2443Stmt::child_iterator InitListExpr::child_begin() { 2444 return InitExprs.size() ? &InitExprs[0] : 0; 2445} 2446Stmt::child_iterator InitListExpr::child_end() { 2447 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2448} 2449 2450// DesignatedInitExpr 2451Stmt::child_iterator DesignatedInitExpr::child_begin() { 2452 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2453 Ptr += sizeof(DesignatedInitExpr); 2454 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2455} 2456Stmt::child_iterator DesignatedInitExpr::child_end() { 2457 return child_iterator(&*child_begin() + NumSubExprs); 2458} 2459 2460// ImplicitValueInitExpr 2461Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2462 return child_iterator(); 2463} 2464 2465Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2466 return child_iterator(); 2467} 2468 2469// ParenListExpr 2470Stmt::child_iterator ParenListExpr::child_begin() { 2471 return &Exprs[0]; 2472} 2473Stmt::child_iterator ParenListExpr::child_end() { 2474 return &Exprs[0]+NumExprs; 2475} 2476 2477// ObjCStringLiteral 2478Stmt::child_iterator ObjCStringLiteral::child_begin() { 2479 return &String; 2480} 2481Stmt::child_iterator ObjCStringLiteral::child_end() { 2482 return &String+1; 2483} 2484 2485// ObjCEncodeExpr 2486Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2487Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2488 2489// ObjCSelectorExpr 2490Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2491 return child_iterator(); 2492} 2493Stmt::child_iterator ObjCSelectorExpr::child_end() { 2494 return child_iterator(); 2495} 2496 2497// ObjCProtocolExpr 2498Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2499 return child_iterator(); 2500} 2501Stmt::child_iterator ObjCProtocolExpr::child_end() { 2502 return child_iterator(); 2503} 2504 2505// ObjCMessageExpr 2506Stmt::child_iterator ObjCMessageExpr::child_begin() { 2507 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2508} 2509Stmt::child_iterator ObjCMessageExpr::child_end() { 2510 return &SubExprs[0]+ARGS_START+getNumArgs(); 2511} 2512 2513// Blocks 2514Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2515Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2516 2517Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2518Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2519