Expr.cpp revision 1a31a18db9d657751f38c724adc0d62e86852bd7
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/raw_ostream.h" 26#include <algorithm> 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// Primary Expressions. 31//===----------------------------------------------------------------------===// 32 33DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 34 SourceRange QualifierRange, 35 NamedDecl *D, SourceLocation NameLoc, 36 bool HasExplicitTemplateArgumentList, 37 SourceLocation LAngleLoc, 38 const TemplateArgumentLoc *ExplicitTemplateArgs, 39 unsigned NumExplicitTemplateArgs, 40 SourceLocation RAngleLoc, 41 QualType T, bool TD, bool VD) 42 : Expr(DeclRefExprClass, T, TD, VD), 43 DecoratedD(D, 44 (Qualifier? HasQualifierFlag : 0) | 45 (HasExplicitTemplateArgumentList? 46 HasExplicitTemplateArgumentListFlag : 0)), 47 Loc(NameLoc) { 48 if (Qualifier) { 49 NameQualifier *NQ = getNameQualifier(); 50 NQ->NNS = Qualifier; 51 NQ->Range = QualifierRange; 52 } 53 54 if (HasExplicitTemplateArgumentList) { 55 ExplicitTemplateArgumentList *ETemplateArgs 56 = getExplicitTemplateArgumentList(); 57 ETemplateArgs->LAngleLoc = LAngleLoc; 58 ETemplateArgs->RAngleLoc = RAngleLoc; 59 ETemplateArgs->NumTemplateArgs = NumExplicitTemplateArgs; 60 61 TemplateArgumentLoc *TemplateArgs = ETemplateArgs->getTemplateArgs(); 62 for (unsigned I = 0; I < NumExplicitTemplateArgs; ++I) 63 new (TemplateArgs + I) TemplateArgumentLoc(ExplicitTemplateArgs[I]); 64 } 65} 66 67DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 68 NestedNameSpecifier *Qualifier, 69 SourceRange QualifierRange, 70 NamedDecl *D, 71 SourceLocation NameLoc, 72 QualType T, bool TD, bool VD) { 73 return Create(Context, Qualifier, QualifierRange, D, NameLoc, 74 false, SourceLocation(), 0, 0, SourceLocation(), 75 T, TD, VD); 76} 77 78DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 79 NestedNameSpecifier *Qualifier, 80 SourceRange QualifierRange, 81 NamedDecl *D, 82 SourceLocation NameLoc, 83 bool HasExplicitTemplateArgumentList, 84 SourceLocation LAngleLoc, 85 const TemplateArgumentLoc *ExplicitTemplateArgs, 86 unsigned NumExplicitTemplateArgs, 87 SourceLocation RAngleLoc, 88 QualType T, bool TD, bool VD) { 89 std::size_t Size = sizeof(DeclRefExpr); 90 if (Qualifier != 0) 91 Size += sizeof(NameQualifier); 92 93 if (HasExplicitTemplateArgumentList) 94 Size += sizeof(ExplicitTemplateArgumentList) + 95 sizeof(TemplateArgumentLoc) * NumExplicitTemplateArgs; 96 97 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 98 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 99 HasExplicitTemplateArgumentList, 100 LAngleLoc, 101 ExplicitTemplateArgs, 102 NumExplicitTemplateArgs, 103 RAngleLoc, 104 T, TD, VD); 105} 106 107SourceRange DeclRefExpr::getSourceRange() const { 108 // FIXME: Does not handle multi-token names well, e.g., operator[]. 109 SourceRange R(Loc); 110 111 if (hasQualifier()) 112 R.setBegin(getQualifierRange().getBegin()); 113 if (hasExplicitTemplateArgumentList()) 114 R.setEnd(getRAngleLoc()); 115 return R; 116} 117 118// FIXME: Maybe this should use DeclPrinter with a special "print predefined 119// expr" policy instead. 120std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT, 121 const Decl *CurrentDecl) { 122 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 123 if (IT != PrettyFunction) 124 return FD->getNameAsString(); 125 126 llvm::SmallString<256> Name; 127 llvm::raw_svector_ostream Out(Name); 128 129 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 130 if (MD->isVirtual()) 131 Out << "virtual "; 132 } 133 134 PrintingPolicy Policy(Context.getLangOptions()); 135 Policy.SuppressTagKind = true; 136 137 std::string Proto = FD->getQualifiedNameAsString(Policy); 138 139 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 140 const FunctionProtoType *FT = 0; 141 if (FD->hasWrittenPrototype()) 142 FT = dyn_cast<FunctionProtoType>(AFT); 143 144 Proto += "("; 145 if (FT) { 146 llvm::raw_string_ostream POut(Proto); 147 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 148 if (i) POut << ", "; 149 std::string Param; 150 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 151 POut << Param; 152 } 153 154 if (FT->isVariadic()) { 155 if (FD->getNumParams()) POut << ", "; 156 POut << "..."; 157 } 158 } 159 Proto += ")"; 160 161 AFT->getResultType().getAsStringInternal(Proto, Policy); 162 163 Out << Proto; 164 165 Out.flush(); 166 return Name.str().str(); 167 } 168 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 169 llvm::SmallString<256> Name; 170 llvm::raw_svector_ostream Out(Name); 171 Out << (MD->isInstanceMethod() ? '-' : '+'); 172 Out << '['; 173 Out << MD->getClassInterface()->getNameAsString(); 174 if (const ObjCCategoryImplDecl *CID = 175 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) { 176 Out << '('; 177 Out << CID->getNameAsString(); 178 Out << ')'; 179 } 180 Out << ' '; 181 Out << MD->getSelector().getAsString(); 182 Out << ']'; 183 184 Out.flush(); 185 return Name.str().str(); 186 } 187 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 188 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 189 return "top level"; 190 } 191 return ""; 192} 193 194/// getValueAsApproximateDouble - This returns the value as an inaccurate 195/// double. Note that this may cause loss of precision, but is useful for 196/// debugging dumps, etc. 197double FloatingLiteral::getValueAsApproximateDouble() const { 198 llvm::APFloat V = getValue(); 199 bool ignored; 200 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 201 &ignored); 202 return V.convertToDouble(); 203} 204 205StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 206 unsigned ByteLength, bool Wide, 207 QualType Ty, 208 const SourceLocation *Loc, 209 unsigned NumStrs) { 210 // Allocate enough space for the StringLiteral plus an array of locations for 211 // any concatenated string tokens. 212 void *Mem = C.Allocate(sizeof(StringLiteral)+ 213 sizeof(SourceLocation)*(NumStrs-1), 214 llvm::alignof<StringLiteral>()); 215 StringLiteral *SL = new (Mem) StringLiteral(Ty); 216 217 // OPTIMIZE: could allocate this appended to the StringLiteral. 218 char *AStrData = new (C, 1) char[ByteLength]; 219 memcpy(AStrData, StrData, ByteLength); 220 SL->StrData = AStrData; 221 SL->ByteLength = ByteLength; 222 SL->IsWide = Wide; 223 SL->TokLocs[0] = Loc[0]; 224 SL->NumConcatenated = NumStrs; 225 226 if (NumStrs != 1) 227 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 228 return SL; 229} 230 231StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 232 void *Mem = C.Allocate(sizeof(StringLiteral)+ 233 sizeof(SourceLocation)*(NumStrs-1), 234 llvm::alignof<StringLiteral>()); 235 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 236 SL->StrData = 0; 237 SL->ByteLength = 0; 238 SL->NumConcatenated = NumStrs; 239 return SL; 240} 241 242void StringLiteral::DoDestroy(ASTContext &C) { 243 C.Deallocate(const_cast<char*>(StrData)); 244 Expr::DoDestroy(C); 245} 246 247void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 248 if (StrData) 249 C.Deallocate(const_cast<char*>(StrData)); 250 251 char *AStrData = new (C, 1) char[Str.size()]; 252 memcpy(AStrData, Str.data(), Str.size()); 253 StrData = AStrData; 254 ByteLength = Str.size(); 255} 256 257/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 258/// corresponds to, e.g. "sizeof" or "[pre]++". 259const char *UnaryOperator::getOpcodeStr(Opcode Op) { 260 switch (Op) { 261 default: assert(0 && "Unknown unary operator"); 262 case PostInc: return "++"; 263 case PostDec: return "--"; 264 case PreInc: return "++"; 265 case PreDec: return "--"; 266 case AddrOf: return "&"; 267 case Deref: return "*"; 268 case Plus: return "+"; 269 case Minus: return "-"; 270 case Not: return "~"; 271 case LNot: return "!"; 272 case Real: return "__real"; 273 case Imag: return "__imag"; 274 case Extension: return "__extension__"; 275 case OffsetOf: return "__builtin_offsetof"; 276 } 277} 278 279UnaryOperator::Opcode 280UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 281 switch (OO) { 282 default: assert(false && "No unary operator for overloaded function"); 283 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 284 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 285 case OO_Amp: return AddrOf; 286 case OO_Star: return Deref; 287 case OO_Plus: return Plus; 288 case OO_Minus: return Minus; 289 case OO_Tilde: return Not; 290 case OO_Exclaim: return LNot; 291 } 292} 293 294OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 295 switch (Opc) { 296 case PostInc: case PreInc: return OO_PlusPlus; 297 case PostDec: case PreDec: return OO_MinusMinus; 298 case AddrOf: return OO_Amp; 299 case Deref: return OO_Star; 300 case Plus: return OO_Plus; 301 case Minus: return OO_Minus; 302 case Not: return OO_Tilde; 303 case LNot: return OO_Exclaim; 304 default: return OO_None; 305 } 306} 307 308 309//===----------------------------------------------------------------------===// 310// Postfix Operators. 311//===----------------------------------------------------------------------===// 312 313CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 314 unsigned numargs, QualType t, SourceLocation rparenloc) 315 : Expr(SC, t, 316 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 317 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 318 NumArgs(numargs) { 319 320 SubExprs = new (C) Stmt*[numargs+1]; 321 SubExprs[FN] = fn; 322 for (unsigned i = 0; i != numargs; ++i) 323 SubExprs[i+ARGS_START] = args[i]; 324 325 RParenLoc = rparenloc; 326} 327 328CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 329 QualType t, SourceLocation rparenloc) 330 : Expr(CallExprClass, t, 331 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 332 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 333 NumArgs(numargs) { 334 335 SubExprs = new (C) Stmt*[numargs+1]; 336 SubExprs[FN] = fn; 337 for (unsigned i = 0; i != numargs; ++i) 338 SubExprs[i+ARGS_START] = args[i]; 339 340 RParenLoc = rparenloc; 341} 342 343CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 344 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 345 SubExprs = new (C) Stmt*[1]; 346} 347 348void CallExpr::DoDestroy(ASTContext& C) { 349 DestroyChildren(C); 350 if (SubExprs) C.Deallocate(SubExprs); 351 this->~CallExpr(); 352 C.Deallocate(this); 353} 354 355FunctionDecl *CallExpr::getDirectCallee() { 356 Expr *CEE = getCallee()->IgnoreParenCasts(); 357 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 358 return dyn_cast<FunctionDecl>(DRE->getDecl()); 359 360 return 0; 361} 362 363/// setNumArgs - This changes the number of arguments present in this call. 364/// Any orphaned expressions are deleted by this, and any new operands are set 365/// to null. 366void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 367 // No change, just return. 368 if (NumArgs == getNumArgs()) return; 369 370 // If shrinking # arguments, just delete the extras and forgot them. 371 if (NumArgs < getNumArgs()) { 372 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 373 getArg(i)->Destroy(C); 374 this->NumArgs = NumArgs; 375 return; 376 } 377 378 // Otherwise, we are growing the # arguments. New an bigger argument array. 379 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 380 // Copy over args. 381 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 382 NewSubExprs[i] = SubExprs[i]; 383 // Null out new args. 384 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 385 NewSubExprs[i] = 0; 386 387 if (SubExprs) C.Deallocate(SubExprs); 388 SubExprs = NewSubExprs; 389 this->NumArgs = NumArgs; 390} 391 392/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 393/// not, return 0. 394unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 395 // All simple function calls (e.g. func()) are implicitly cast to pointer to 396 // function. As a result, we try and obtain the DeclRefExpr from the 397 // ImplicitCastExpr. 398 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 399 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 400 return 0; 401 402 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 403 if (!DRE) 404 return 0; 405 406 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 407 if (!FDecl) 408 return 0; 409 410 if (!FDecl->getIdentifier()) 411 return 0; 412 413 return FDecl->getBuiltinID(); 414} 415 416QualType CallExpr::getCallReturnType() const { 417 QualType CalleeType = getCallee()->getType(); 418 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 419 CalleeType = FnTypePtr->getPointeeType(); 420 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 421 CalleeType = BPT->getPointeeType(); 422 423 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 424 return FnType->getResultType(); 425} 426 427MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 428 SourceRange qualrange, NamedDecl *memberdecl, 429 SourceLocation l, bool has_explicit, 430 SourceLocation langle, 431 const TemplateArgumentLoc *targs, unsigned numtargs, 432 SourceLocation rangle, QualType ty) 433 : Expr(MemberExprClass, ty, 434 base->isTypeDependent() || (qual && qual->isDependent()), 435 base->isValueDependent() || (qual && qual->isDependent())), 436 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 437 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(has_explicit) { 438 // Initialize the qualifier, if any. 439 if (HasQualifier) { 440 NameQualifier *NQ = getMemberQualifier(); 441 NQ->NNS = qual; 442 NQ->Range = qualrange; 443 } 444 445 // Initialize the explicit template argument list, if any. 446 if (HasExplicitTemplateArgumentList) { 447 ExplicitTemplateArgumentList *ETemplateArgs 448 = getExplicitTemplateArgumentList(); 449 ETemplateArgs->LAngleLoc = langle; 450 ETemplateArgs->RAngleLoc = rangle; 451 ETemplateArgs->NumTemplateArgs = numtargs; 452 453 TemplateArgumentLoc *TemplateArgs = ETemplateArgs->getTemplateArgs(); 454 for (unsigned I = 0; I < numtargs; ++I) 455 new (TemplateArgs + I) TemplateArgumentLoc(targs[I]); 456 } 457} 458 459MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 460 NestedNameSpecifier *qual, 461 SourceRange qualrange, 462 NamedDecl *memberdecl, 463 SourceLocation l, 464 bool has_explicit, 465 SourceLocation langle, 466 const TemplateArgumentLoc *targs, 467 unsigned numtargs, 468 SourceLocation rangle, 469 QualType ty) { 470 std::size_t Size = sizeof(MemberExpr); 471 if (qual != 0) 472 Size += sizeof(NameQualifier); 473 474 if (has_explicit) 475 Size += sizeof(ExplicitTemplateArgumentList) + 476 sizeof(TemplateArgumentLoc) * numtargs; 477 478 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 479 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l, 480 has_explicit, langle, targs, numtargs, rangle, 481 ty); 482} 483 484const char *CastExpr::getCastKindName() const { 485 switch (getCastKind()) { 486 case CastExpr::CK_Unknown: 487 return "Unknown"; 488 case CastExpr::CK_BitCast: 489 return "BitCast"; 490 case CastExpr::CK_NoOp: 491 return "NoOp"; 492 case CastExpr::CK_DerivedToBase: 493 return "DerivedToBase"; 494 case CastExpr::CK_Dynamic: 495 return "Dynamic"; 496 case CastExpr::CK_ToUnion: 497 return "ToUnion"; 498 case CastExpr::CK_ArrayToPointerDecay: 499 return "ArrayToPointerDecay"; 500 case CastExpr::CK_FunctionToPointerDecay: 501 return "FunctionToPointerDecay"; 502 case CastExpr::CK_NullToMemberPointer: 503 return "NullToMemberPointer"; 504 case CastExpr::CK_BaseToDerivedMemberPointer: 505 return "BaseToDerivedMemberPointer"; 506 case CastExpr::CK_DerivedToBaseMemberPointer: 507 return "DerivedToBaseMemberPointer"; 508 case CastExpr::CK_UserDefinedConversion: 509 return "UserDefinedConversion"; 510 case CastExpr::CK_ConstructorConversion: 511 return "ConstructorConversion"; 512 case CastExpr::CK_IntegralToPointer: 513 return "IntegralToPointer"; 514 case CastExpr::CK_PointerToIntegral: 515 return "PointerToIntegral"; 516 case CastExpr::CK_ToVoid: 517 return "ToVoid"; 518 case CastExpr::CK_VectorSplat: 519 return "VectorSplat"; 520 case CastExpr::CK_IntegralCast: 521 return "IntegralCast"; 522 case CastExpr::CK_IntegralToFloating: 523 return "IntegralToFloating"; 524 case CastExpr::CK_FloatingToIntegral: 525 return "FloatingToIntegral"; 526 case CastExpr::CK_FloatingCast: 527 return "FloatingCast"; 528 } 529 530 assert(0 && "Unhandled cast kind!"); 531 return 0; 532} 533 534/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 535/// corresponds to, e.g. "<<=". 536const char *BinaryOperator::getOpcodeStr(Opcode Op) { 537 switch (Op) { 538 case PtrMemD: return ".*"; 539 case PtrMemI: return "->*"; 540 case Mul: return "*"; 541 case Div: return "/"; 542 case Rem: return "%"; 543 case Add: return "+"; 544 case Sub: return "-"; 545 case Shl: return "<<"; 546 case Shr: return ">>"; 547 case LT: return "<"; 548 case GT: return ">"; 549 case LE: return "<="; 550 case GE: return ">="; 551 case EQ: return "=="; 552 case NE: return "!="; 553 case And: return "&"; 554 case Xor: return "^"; 555 case Or: return "|"; 556 case LAnd: return "&&"; 557 case LOr: return "||"; 558 case Assign: return "="; 559 case MulAssign: return "*="; 560 case DivAssign: return "/="; 561 case RemAssign: return "%="; 562 case AddAssign: return "+="; 563 case SubAssign: return "-="; 564 case ShlAssign: return "<<="; 565 case ShrAssign: return ">>="; 566 case AndAssign: return "&="; 567 case XorAssign: return "^="; 568 case OrAssign: return "|="; 569 case Comma: return ","; 570 } 571 572 return ""; 573} 574 575BinaryOperator::Opcode 576BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 577 switch (OO) { 578 default: assert(false && "Not an overloadable binary operator"); 579 case OO_Plus: return Add; 580 case OO_Minus: return Sub; 581 case OO_Star: return Mul; 582 case OO_Slash: return Div; 583 case OO_Percent: return Rem; 584 case OO_Caret: return Xor; 585 case OO_Amp: return And; 586 case OO_Pipe: return Or; 587 case OO_Equal: return Assign; 588 case OO_Less: return LT; 589 case OO_Greater: return GT; 590 case OO_PlusEqual: return AddAssign; 591 case OO_MinusEqual: return SubAssign; 592 case OO_StarEqual: return MulAssign; 593 case OO_SlashEqual: return DivAssign; 594 case OO_PercentEqual: return RemAssign; 595 case OO_CaretEqual: return XorAssign; 596 case OO_AmpEqual: return AndAssign; 597 case OO_PipeEqual: return OrAssign; 598 case OO_LessLess: return Shl; 599 case OO_GreaterGreater: return Shr; 600 case OO_LessLessEqual: return ShlAssign; 601 case OO_GreaterGreaterEqual: return ShrAssign; 602 case OO_EqualEqual: return EQ; 603 case OO_ExclaimEqual: return NE; 604 case OO_LessEqual: return LE; 605 case OO_GreaterEqual: return GE; 606 case OO_AmpAmp: return LAnd; 607 case OO_PipePipe: return LOr; 608 case OO_Comma: return Comma; 609 case OO_ArrowStar: return PtrMemI; 610 } 611} 612 613OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 614 static const OverloadedOperatorKind OverOps[] = { 615 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 616 OO_Star, OO_Slash, OO_Percent, 617 OO_Plus, OO_Minus, 618 OO_LessLess, OO_GreaterGreater, 619 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 620 OO_EqualEqual, OO_ExclaimEqual, 621 OO_Amp, 622 OO_Caret, 623 OO_Pipe, 624 OO_AmpAmp, 625 OO_PipePipe, 626 OO_Equal, OO_StarEqual, 627 OO_SlashEqual, OO_PercentEqual, 628 OO_PlusEqual, OO_MinusEqual, 629 OO_LessLessEqual, OO_GreaterGreaterEqual, 630 OO_AmpEqual, OO_CaretEqual, 631 OO_PipeEqual, 632 OO_Comma 633 }; 634 return OverOps[Opc]; 635} 636 637InitListExpr::InitListExpr(SourceLocation lbraceloc, 638 Expr **initExprs, unsigned numInits, 639 SourceLocation rbraceloc) 640 : Expr(InitListExprClass, QualType(), 641 hasAnyTypeDependentArguments(initExprs, numInits), 642 hasAnyValueDependentArguments(initExprs, numInits)), 643 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 644 UnionFieldInit(0), HadArrayRangeDesignator(false) { 645 646 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits); 647} 648 649void InitListExpr::reserveInits(unsigned NumInits) { 650 if (NumInits > InitExprs.size()) 651 InitExprs.reserve(NumInits); 652} 653 654void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) { 655 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 656 Idx < LastIdx; ++Idx) 657 InitExprs[Idx]->Destroy(Context); 658 InitExprs.resize(NumInits, 0); 659} 660 661Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) { 662 if (Init >= InitExprs.size()) { 663 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0); 664 InitExprs.back() = expr; 665 return 0; 666 } 667 668 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 669 InitExprs[Init] = expr; 670 return Result; 671} 672 673/// getFunctionType - Return the underlying function type for this block. 674/// 675const FunctionType *BlockExpr::getFunctionType() const { 676 return getType()->getAs<BlockPointerType>()-> 677 getPointeeType()->getAs<FunctionType>(); 678} 679 680SourceLocation BlockExpr::getCaretLocation() const { 681 return TheBlock->getCaretLocation(); 682} 683const Stmt *BlockExpr::getBody() const { 684 return TheBlock->getBody(); 685} 686Stmt *BlockExpr::getBody() { 687 return TheBlock->getBody(); 688} 689 690 691//===----------------------------------------------------------------------===// 692// Generic Expression Routines 693//===----------------------------------------------------------------------===// 694 695/// isUnusedResultAWarning - Return true if this immediate expression should 696/// be warned about if the result is unused. If so, fill in Loc and Ranges 697/// with location to warn on and the source range[s] to report with the 698/// warning. 699bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 700 SourceRange &R2) const { 701 // Don't warn if the expr is type dependent. The type could end up 702 // instantiating to void. 703 if (isTypeDependent()) 704 return false; 705 706 switch (getStmtClass()) { 707 default: 708 Loc = getExprLoc(); 709 R1 = getSourceRange(); 710 return true; 711 case ParenExprClass: 712 return cast<ParenExpr>(this)->getSubExpr()-> 713 isUnusedResultAWarning(Loc, R1, R2); 714 case UnaryOperatorClass: { 715 const UnaryOperator *UO = cast<UnaryOperator>(this); 716 717 switch (UO->getOpcode()) { 718 default: break; 719 case UnaryOperator::PostInc: 720 case UnaryOperator::PostDec: 721 case UnaryOperator::PreInc: 722 case UnaryOperator::PreDec: // ++/-- 723 return false; // Not a warning. 724 case UnaryOperator::Deref: 725 // Dereferencing a volatile pointer is a side-effect. 726 if (getType().isVolatileQualified()) 727 return false; 728 break; 729 case UnaryOperator::Real: 730 case UnaryOperator::Imag: 731 // accessing a piece of a volatile complex is a side-effect. 732 if (UO->getSubExpr()->getType().isVolatileQualified()) 733 return false; 734 break; 735 case UnaryOperator::Extension: 736 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2); 737 } 738 Loc = UO->getOperatorLoc(); 739 R1 = UO->getSubExpr()->getSourceRange(); 740 return true; 741 } 742 case BinaryOperatorClass: { 743 const BinaryOperator *BO = cast<BinaryOperator>(this); 744 // Consider comma to have side effects if the LHS or RHS does. 745 if (BO->getOpcode() == BinaryOperator::Comma) 746 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2) || 747 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2); 748 749 if (BO->isAssignmentOp()) 750 return false; 751 Loc = BO->getOperatorLoc(); 752 R1 = BO->getLHS()->getSourceRange(); 753 R2 = BO->getRHS()->getSourceRange(); 754 return true; 755 } 756 case CompoundAssignOperatorClass: 757 return false; 758 759 case ConditionalOperatorClass: { 760 // The condition must be evaluated, but if either the LHS or RHS is a 761 // warning, warn about them. 762 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 763 if (Exp->getLHS() && 764 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2)) 765 return true; 766 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2); 767 } 768 769 case MemberExprClass: 770 // If the base pointer or element is to a volatile pointer/field, accessing 771 // it is a side effect. 772 if (getType().isVolatileQualified()) 773 return false; 774 Loc = cast<MemberExpr>(this)->getMemberLoc(); 775 R1 = SourceRange(Loc, Loc); 776 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 777 return true; 778 779 case ArraySubscriptExprClass: 780 // If the base pointer or element is to a volatile pointer/field, accessing 781 // it is a side effect. 782 if (getType().isVolatileQualified()) 783 return false; 784 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 785 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 786 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 787 return true; 788 789 case CallExprClass: 790 case CXXOperatorCallExprClass: 791 case CXXMemberCallExprClass: { 792 // If this is a direct call, get the callee. 793 const CallExpr *CE = cast<CallExpr>(this); 794 if (const FunctionDecl *FD = CE->getDirectCallee()) { 795 // If the callee has attribute pure, const, or warn_unused_result, warn 796 // about it. void foo() { strlen("bar"); } should warn. 797 // 798 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 799 // updated to match for QoI. 800 if (FD->getAttr<WarnUnusedResultAttr>() || 801 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 802 Loc = CE->getCallee()->getLocStart(); 803 R1 = CE->getCallee()->getSourceRange(); 804 805 if (unsigned NumArgs = CE->getNumArgs()) 806 R2 = SourceRange(CE->getArg(0)->getLocStart(), 807 CE->getArg(NumArgs-1)->getLocEnd()); 808 return true; 809 } 810 } 811 return false; 812 } 813 case ObjCMessageExprClass: 814 return false; 815 816 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 817#if 0 818 const ObjCImplicitSetterGetterRefExpr *Ref = 819 cast<ObjCImplicitSetterGetterRefExpr>(this); 820 // FIXME: We really want the location of the '.' here. 821 Loc = Ref->getLocation(); 822 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 823 if (Ref->getBase()) 824 R2 = Ref->getBase()->getSourceRange(); 825#else 826 Loc = getExprLoc(); 827 R1 = getSourceRange(); 828#endif 829 return true; 830 } 831 case StmtExprClass: { 832 // Statement exprs don't logically have side effects themselves, but are 833 // sometimes used in macros in ways that give them a type that is unused. 834 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 835 // however, if the result of the stmt expr is dead, we don't want to emit a 836 // warning. 837 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 838 if (!CS->body_empty()) 839 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 840 return E->isUnusedResultAWarning(Loc, R1, R2); 841 842 Loc = cast<StmtExpr>(this)->getLParenLoc(); 843 R1 = getSourceRange(); 844 return true; 845 } 846 case CStyleCastExprClass: 847 // If this is an explicit cast to void, allow it. People do this when they 848 // think they know what they're doing :). 849 if (getType()->isVoidType()) 850 return false; 851 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 852 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 853 return true; 854 case CXXFunctionalCastExprClass: 855 // If this is a cast to void, check the operand. Otherwise, the result of 856 // the cast is unused. 857 if (getType()->isVoidType()) 858 return cast<CastExpr>(this)->getSubExpr() 859 ->isUnusedResultAWarning(Loc, R1, R2); 860 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 861 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 862 return true; 863 864 case ImplicitCastExprClass: 865 // Check the operand, since implicit casts are inserted by Sema 866 return cast<ImplicitCastExpr>(this) 867 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2); 868 869 case CXXDefaultArgExprClass: 870 return cast<CXXDefaultArgExpr>(this) 871 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2); 872 873 case CXXNewExprClass: 874 // FIXME: In theory, there might be new expressions that don't have side 875 // effects (e.g. a placement new with an uninitialized POD). 876 case CXXDeleteExprClass: 877 return false; 878 case CXXBindTemporaryExprClass: 879 return cast<CXXBindTemporaryExpr>(this) 880 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2); 881 case CXXExprWithTemporariesClass: 882 return cast<CXXExprWithTemporaries>(this) 883 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2); 884 } 885} 886 887/// DeclCanBeLvalue - Determine whether the given declaration can be 888/// an lvalue. This is a helper routine for isLvalue. 889static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 890 // C++ [temp.param]p6: 891 // A non-type non-reference template-parameter is not an lvalue. 892 if (const NonTypeTemplateParmDecl *NTTParm 893 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 894 return NTTParm->getType()->isReferenceType(); 895 896 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 897 // C++ 3.10p2: An lvalue refers to an object or function. 898 (Ctx.getLangOptions().CPlusPlus && 899 (isa<FunctionDecl>(Decl) || isa<OverloadedFunctionDecl>(Decl) || 900 isa<FunctionTemplateDecl>(Decl))); 901} 902 903/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 904/// incomplete type other than void. Nonarray expressions that can be lvalues: 905/// - name, where name must be a variable 906/// - e[i] 907/// - (e), where e must be an lvalue 908/// - e.name, where e must be an lvalue 909/// - e->name 910/// - *e, the type of e cannot be a function type 911/// - string-constant 912/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 913/// - reference type [C++ [expr]] 914/// 915Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 916 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 917 918 isLvalueResult Res = isLvalueInternal(Ctx); 919 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 920 return Res; 921 922 // first, check the type (C99 6.3.2.1). Expressions with function 923 // type in C are not lvalues, but they can be lvalues in C++. 924 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 925 return LV_NotObjectType; 926 927 // Allow qualified void which is an incomplete type other than void (yuck). 928 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 929 return LV_IncompleteVoidType; 930 931 return LV_Valid; 932} 933 934// Check whether the expression can be sanely treated like an l-value 935Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 936 switch (getStmtClass()) { 937 case StringLiteralClass: // C99 6.5.1p4 938 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 939 return LV_Valid; 940 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 941 // For vectors, make sure base is an lvalue (i.e. not a function call). 942 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 943 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 944 return LV_Valid; 945 case DeclRefExprClass: { // C99 6.5.1p2 946 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 947 if (DeclCanBeLvalue(RefdDecl, Ctx)) 948 return LV_Valid; 949 break; 950 } 951 case BlockDeclRefExprClass: { 952 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 953 if (isa<VarDecl>(BDR->getDecl())) 954 return LV_Valid; 955 break; 956 } 957 case MemberExprClass: { 958 const MemberExpr *m = cast<MemberExpr>(this); 959 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 960 NamedDecl *Member = m->getMemberDecl(); 961 // C++ [expr.ref]p4: 962 // If E2 is declared to have type "reference to T", then E1.E2 963 // is an lvalue. 964 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 965 if (Value->getType()->isReferenceType()) 966 return LV_Valid; 967 968 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 969 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 970 return LV_Valid; 971 972 // -- If E2 is a non-static data member [...]. If E1 is an 973 // lvalue, then E1.E2 is an lvalue. 974 if (isa<FieldDecl>(Member)) 975 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 976 977 // -- If it refers to a static member function [...], then 978 // E1.E2 is an lvalue. 979 // -- Otherwise, if E1.E2 refers to a non-static member 980 // function [...], then E1.E2 is not an lvalue. 981 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 982 return Method->isStatic()? LV_Valid : LV_MemberFunction; 983 984 // -- If E2 is a member enumerator [...], the expression E1.E2 985 // is not an lvalue. 986 if (isa<EnumConstantDecl>(Member)) 987 return LV_InvalidExpression; 988 989 // Not an lvalue. 990 return LV_InvalidExpression; 991 } 992 993 // C99 6.5.2.3p4 994 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx); 995 } 996 case UnaryOperatorClass: 997 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 998 return LV_Valid; // C99 6.5.3p4 999 1000 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1001 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1002 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1003 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1004 1005 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1006 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1007 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1008 return LV_Valid; 1009 break; 1010 case ImplicitCastExprClass: 1011 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid 1012 : LV_InvalidExpression; 1013 case ParenExprClass: // C99 6.5.1p5 1014 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1015 case BinaryOperatorClass: 1016 case CompoundAssignOperatorClass: { 1017 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1018 1019 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1020 BinOp->getOpcode() == BinaryOperator::Comma) 1021 return BinOp->getRHS()->isLvalue(Ctx); 1022 1023 // C++ [expr.mptr.oper]p6 1024 // The result of a .* expression is an lvalue only if its first operand is 1025 // an lvalue and its second operand is a pointer to data member. 1026 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1027 !BinOp->getType()->isFunctionType()) 1028 return BinOp->getLHS()->isLvalue(Ctx); 1029 1030 // The result of an ->* expression is an lvalue only if its second operand 1031 // is a pointer to data member. 1032 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1033 !BinOp->getType()->isFunctionType()) { 1034 QualType Ty = BinOp->getRHS()->getType(); 1035 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1036 return LV_Valid; 1037 } 1038 1039 if (!BinOp->isAssignmentOp()) 1040 return LV_InvalidExpression; 1041 1042 if (Ctx.getLangOptions().CPlusPlus) 1043 // C++ [expr.ass]p1: 1044 // The result of an assignment operation [...] is an lvalue. 1045 return LV_Valid; 1046 1047 1048 // C99 6.5.16: 1049 // An assignment expression [...] is not an lvalue. 1050 return LV_InvalidExpression; 1051 } 1052 case CallExprClass: 1053 case CXXOperatorCallExprClass: 1054 case CXXMemberCallExprClass: { 1055 // C++0x [expr.call]p10 1056 // A function call is an lvalue if and only if the result type 1057 // is an lvalue reference. 1058 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1059 if (ReturnType->isLValueReferenceType()) 1060 return LV_Valid; 1061 1062 break; 1063 } 1064 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1065 return LV_Valid; 1066 case ChooseExprClass: 1067 // __builtin_choose_expr is an lvalue if the selected operand is. 1068 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1069 case ExtVectorElementExprClass: 1070 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1071 return LV_DuplicateVectorComponents; 1072 return LV_Valid; 1073 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1074 return LV_Valid; 1075 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1076 return LV_Valid; 1077 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property. 1078 return LV_Valid; 1079 case PredefinedExprClass: 1080 return LV_Valid; 1081 case CXXDefaultArgExprClass: 1082 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1083 case CXXConditionDeclExprClass: 1084 return LV_Valid; 1085 case CStyleCastExprClass: 1086 case CXXFunctionalCastExprClass: 1087 case CXXStaticCastExprClass: 1088 case CXXDynamicCastExprClass: 1089 case CXXReinterpretCastExprClass: 1090 case CXXConstCastExprClass: 1091 // The result of an explicit cast is an lvalue if the type we are 1092 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1093 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1094 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1095 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1096 isLValueReferenceType()) 1097 return LV_Valid; 1098 break; 1099 case CXXTypeidExprClass: 1100 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1101 return LV_Valid; 1102 case CXXBindTemporaryExprClass: 1103 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1104 isLvalueInternal(Ctx); 1105 case ConditionalOperatorClass: { 1106 // Complicated handling is only for C++. 1107 if (!Ctx.getLangOptions().CPlusPlus) 1108 return LV_InvalidExpression; 1109 1110 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1111 // everywhere there's an object converted to an rvalue. Also, any other 1112 // casts should be wrapped by ImplicitCastExprs. There's just the special 1113 // case involving throws to work out. 1114 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1115 Expr *True = Cond->getTrueExpr(); 1116 Expr *False = Cond->getFalseExpr(); 1117 // C++0x 5.16p2 1118 // If either the second or the third operand has type (cv) void, [...] 1119 // the result [...] is an rvalue. 1120 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1121 return LV_InvalidExpression; 1122 1123 // Both sides must be lvalues for the result to be an lvalue. 1124 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1125 return LV_InvalidExpression; 1126 1127 // That's it. 1128 return LV_Valid; 1129 } 1130 1131 case TemplateIdRefExprClass: { 1132 const TemplateIdRefExpr *TID = cast<TemplateIdRefExpr>(this); 1133 TemplateName Template = TID->getTemplateName(); 1134 NamedDecl *ND = Template.getAsTemplateDecl(); 1135 if (!ND) 1136 ND = Template.getAsOverloadedFunctionDecl(); 1137 if (ND && DeclCanBeLvalue(ND, Ctx)) 1138 return LV_Valid; 1139 1140 break; 1141 } 1142 1143 default: 1144 break; 1145 } 1146 return LV_InvalidExpression; 1147} 1148 1149/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1150/// does not have an incomplete type, does not have a const-qualified type, and 1151/// if it is a structure or union, does not have any member (including, 1152/// recursively, any member or element of all contained aggregates or unions) 1153/// with a const-qualified type. 1154Expr::isModifiableLvalueResult 1155Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1156 isLvalueResult lvalResult = isLvalue(Ctx); 1157 1158 switch (lvalResult) { 1159 case LV_Valid: 1160 // C++ 3.10p11: Functions cannot be modified, but pointers to 1161 // functions can be modifiable. 1162 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1163 return MLV_NotObjectType; 1164 break; 1165 1166 case LV_NotObjectType: return MLV_NotObjectType; 1167 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1168 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1169 case LV_InvalidExpression: 1170 // If the top level is a C-style cast, and the subexpression is a valid 1171 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1172 // GCC extension. We don't support it, but we want to produce good 1173 // diagnostics when it happens so that the user knows why. 1174 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1175 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1176 if (Loc) 1177 *Loc = CE->getLParenLoc(); 1178 return MLV_LValueCast; 1179 } 1180 } 1181 return MLV_InvalidExpression; 1182 case LV_MemberFunction: return MLV_MemberFunction; 1183 } 1184 1185 // The following is illegal: 1186 // void takeclosure(void (^C)(void)); 1187 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1188 // 1189 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1190 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1191 return MLV_NotBlockQualified; 1192 } 1193 1194 // Assigning to an 'implicit' property? 1195 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1196 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1197 if (Expr->getSetterMethod() == 0) 1198 return MLV_NoSetterProperty; 1199 } 1200 1201 QualType CT = Ctx.getCanonicalType(getType()); 1202 1203 if (CT.isConstQualified()) 1204 return MLV_ConstQualified; 1205 if (CT->isArrayType()) 1206 return MLV_ArrayType; 1207 if (CT->isIncompleteType()) 1208 return MLV_IncompleteType; 1209 1210 if (const RecordType *r = CT->getAs<RecordType>()) { 1211 if (r->hasConstFields()) 1212 return MLV_ConstQualified; 1213 } 1214 1215 return MLV_Valid; 1216} 1217 1218/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1219/// returns true, if it is; false otherwise. 1220bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1221 switch (getStmtClass()) { 1222 default: 1223 return false; 1224 case ObjCIvarRefExprClass: 1225 return true; 1226 case Expr::UnaryOperatorClass: 1227 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1228 case ParenExprClass: 1229 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1230 case ImplicitCastExprClass: 1231 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1232 case CStyleCastExprClass: 1233 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1234 case DeclRefExprClass: { 1235 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1236 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1237 if (VD->hasGlobalStorage()) 1238 return true; 1239 QualType T = VD->getType(); 1240 // dereferencing to a pointer is always a gc'able candidate, 1241 // unless it is __weak. 1242 return T->isPointerType() && 1243 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1244 } 1245 return false; 1246 } 1247 case MemberExprClass: { 1248 const MemberExpr *M = cast<MemberExpr>(this); 1249 return M->getBase()->isOBJCGCCandidate(Ctx); 1250 } 1251 case ArraySubscriptExprClass: 1252 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1253 } 1254} 1255Expr* Expr::IgnoreParens() { 1256 Expr* E = this; 1257 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1258 E = P->getSubExpr(); 1259 1260 return E; 1261} 1262 1263/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1264/// or CastExprs or ImplicitCastExprs, returning their operand. 1265Expr *Expr::IgnoreParenCasts() { 1266 Expr *E = this; 1267 while (true) { 1268 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1269 E = P->getSubExpr(); 1270 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1271 E = P->getSubExpr(); 1272 else 1273 return E; 1274 } 1275} 1276 1277/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1278/// value (including ptr->int casts of the same size). Strip off any 1279/// ParenExpr or CastExprs, returning their operand. 1280Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1281 Expr *E = this; 1282 while (true) { 1283 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1284 E = P->getSubExpr(); 1285 continue; 1286 } 1287 1288 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1289 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1290 // ptr<->int casts of the same width. We also ignore all identify casts. 1291 Expr *SE = P->getSubExpr(); 1292 1293 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1294 E = SE; 1295 continue; 1296 } 1297 1298 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1299 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1300 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1301 E = SE; 1302 continue; 1303 } 1304 } 1305 1306 return E; 1307 } 1308} 1309 1310 1311/// hasAnyTypeDependentArguments - Determines if any of the expressions 1312/// in Exprs is type-dependent. 1313bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1314 for (unsigned I = 0; I < NumExprs; ++I) 1315 if (Exprs[I]->isTypeDependent()) 1316 return true; 1317 1318 return false; 1319} 1320 1321/// hasAnyValueDependentArguments - Determines if any of the expressions 1322/// in Exprs is value-dependent. 1323bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1324 for (unsigned I = 0; I < NumExprs; ++I) 1325 if (Exprs[I]->isValueDependent()) 1326 return true; 1327 1328 return false; 1329} 1330 1331bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1332 // This function is attempting whether an expression is an initializer 1333 // which can be evaluated at compile-time. isEvaluatable handles most 1334 // of the cases, but it can't deal with some initializer-specific 1335 // expressions, and it can't deal with aggregates; we deal with those here, 1336 // and fall back to isEvaluatable for the other cases. 1337 1338 // FIXME: This function assumes the variable being assigned to 1339 // isn't a reference type! 1340 1341 switch (getStmtClass()) { 1342 default: break; 1343 case StringLiteralClass: 1344 case ObjCStringLiteralClass: 1345 case ObjCEncodeExprClass: 1346 return true; 1347 case CompoundLiteralExprClass: { 1348 // This handles gcc's extension that allows global initializers like 1349 // "struct x {int x;} x = (struct x) {};". 1350 // FIXME: This accepts other cases it shouldn't! 1351 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1352 return Exp->isConstantInitializer(Ctx); 1353 } 1354 case InitListExprClass: { 1355 // FIXME: This doesn't deal with fields with reference types correctly. 1356 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1357 // to bitfields. 1358 const InitListExpr *Exp = cast<InitListExpr>(this); 1359 unsigned numInits = Exp->getNumInits(); 1360 for (unsigned i = 0; i < numInits; i++) { 1361 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1362 return false; 1363 } 1364 return true; 1365 } 1366 case ImplicitValueInitExprClass: 1367 return true; 1368 case ParenExprClass: 1369 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1370 case UnaryOperatorClass: { 1371 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1372 if (Exp->getOpcode() == UnaryOperator::Extension) 1373 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1374 break; 1375 } 1376 case BinaryOperatorClass: { 1377 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1378 // but this handles the common case. 1379 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1380 if (Exp->getOpcode() == BinaryOperator::Sub && 1381 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1382 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1383 return true; 1384 break; 1385 } 1386 case ImplicitCastExprClass: 1387 case CStyleCastExprClass: 1388 // Handle casts with a destination that's a struct or union; this 1389 // deals with both the gcc no-op struct cast extension and the 1390 // cast-to-union extension. 1391 if (getType()->isRecordType()) 1392 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1393 1394 // Integer->integer casts can be handled here, which is important for 1395 // things like (int)(&&x-&&y). Scary but true. 1396 if (getType()->isIntegerType() && 1397 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1398 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1399 1400 break; 1401 } 1402 return isEvaluatable(Ctx); 1403} 1404 1405/// isIntegerConstantExpr - this recursive routine will test if an expression is 1406/// an integer constant expression. 1407 1408/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 1409/// comma, etc 1410/// 1411/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 1412/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 1413/// cast+dereference. 1414 1415// CheckICE - This function does the fundamental ICE checking: the returned 1416// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 1417// Note that to reduce code duplication, this helper does no evaluation 1418// itself; the caller checks whether the expression is evaluatable, and 1419// in the rare cases where CheckICE actually cares about the evaluated 1420// value, it calls into Evalute. 1421// 1422// Meanings of Val: 1423// 0: This expression is an ICE if it can be evaluated by Evaluate. 1424// 1: This expression is not an ICE, but if it isn't evaluated, it's 1425// a legal subexpression for an ICE. This return value is used to handle 1426// the comma operator in C99 mode. 1427// 2: This expression is not an ICE, and is not a legal subexpression for one. 1428 1429struct ICEDiag { 1430 unsigned Val; 1431 SourceLocation Loc; 1432 1433 public: 1434 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 1435 ICEDiag() : Val(0) {} 1436}; 1437 1438ICEDiag NoDiag() { return ICEDiag(); } 1439 1440static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 1441 Expr::EvalResult EVResult; 1442 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1443 !EVResult.Val.isInt()) { 1444 return ICEDiag(2, E->getLocStart()); 1445 } 1446 return NoDiag(); 1447} 1448 1449static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 1450 assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 1451 if (!E->getType()->isIntegralType()) { 1452 return ICEDiag(2, E->getLocStart()); 1453 } 1454 1455 switch (E->getStmtClass()) { 1456#define STMT(Node, Base) case Expr::Node##Class: 1457#define EXPR(Node, Base) 1458#include "clang/AST/StmtNodes.def" 1459 case Expr::PredefinedExprClass: 1460 case Expr::FloatingLiteralClass: 1461 case Expr::ImaginaryLiteralClass: 1462 case Expr::StringLiteralClass: 1463 case Expr::ArraySubscriptExprClass: 1464 case Expr::MemberExprClass: 1465 case Expr::CompoundAssignOperatorClass: 1466 case Expr::CompoundLiteralExprClass: 1467 case Expr::ExtVectorElementExprClass: 1468 case Expr::InitListExprClass: 1469 case Expr::DesignatedInitExprClass: 1470 case Expr::ImplicitValueInitExprClass: 1471 case Expr::ParenListExprClass: 1472 case Expr::VAArgExprClass: 1473 case Expr::AddrLabelExprClass: 1474 case Expr::StmtExprClass: 1475 case Expr::CXXMemberCallExprClass: 1476 case Expr::CXXDynamicCastExprClass: 1477 case Expr::CXXTypeidExprClass: 1478 case Expr::CXXNullPtrLiteralExprClass: 1479 case Expr::CXXThisExprClass: 1480 case Expr::CXXThrowExprClass: 1481 case Expr::CXXConditionDeclExprClass: // FIXME: is this correct? 1482 case Expr::CXXNewExprClass: 1483 case Expr::CXXDeleteExprClass: 1484 case Expr::CXXPseudoDestructorExprClass: 1485 case Expr::UnresolvedFunctionNameExprClass: 1486 case Expr::UnresolvedDeclRefExprClass: 1487 case Expr::TemplateIdRefExprClass: 1488 case Expr::CXXConstructExprClass: 1489 case Expr::CXXBindTemporaryExprClass: 1490 case Expr::CXXExprWithTemporariesClass: 1491 case Expr::CXXTemporaryObjectExprClass: 1492 case Expr::CXXUnresolvedConstructExprClass: 1493 case Expr::CXXUnresolvedMemberExprClass: 1494 case Expr::ObjCStringLiteralClass: 1495 case Expr::ObjCEncodeExprClass: 1496 case Expr::ObjCMessageExprClass: 1497 case Expr::ObjCSelectorExprClass: 1498 case Expr::ObjCProtocolExprClass: 1499 case Expr::ObjCIvarRefExprClass: 1500 case Expr::ObjCPropertyRefExprClass: 1501 case Expr::ObjCImplicitSetterGetterRefExprClass: 1502 case Expr::ObjCSuperExprClass: 1503 case Expr::ObjCIsaExprClass: 1504 case Expr::ShuffleVectorExprClass: 1505 case Expr::BlockExprClass: 1506 case Expr::BlockDeclRefExprClass: 1507 case Expr::NoStmtClass: 1508 case Expr::ExprClass: 1509 return ICEDiag(2, E->getLocStart()); 1510 1511 case Expr::GNUNullExprClass: 1512 // GCC considers the GNU __null value to be an integral constant expression. 1513 return NoDiag(); 1514 1515 case Expr::ParenExprClass: 1516 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 1517 case Expr::IntegerLiteralClass: 1518 case Expr::CharacterLiteralClass: 1519 case Expr::CXXBoolLiteralExprClass: 1520 case Expr::CXXZeroInitValueExprClass: 1521 case Expr::TypesCompatibleExprClass: 1522 case Expr::UnaryTypeTraitExprClass: 1523 return NoDiag(); 1524 case Expr::CallExprClass: 1525 case Expr::CXXOperatorCallExprClass: { 1526 const CallExpr *CE = cast<CallExpr>(E); 1527 if (CE->isBuiltinCall(Ctx)) 1528 return CheckEvalInICE(E, Ctx); 1529 return ICEDiag(2, E->getLocStart()); 1530 } 1531 case Expr::DeclRefExprClass: 1532 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 1533 return NoDiag(); 1534 if (Ctx.getLangOptions().CPlusPlus && 1535 E->getType().getCVRQualifiers() == Qualifiers::Const) { 1536 // C++ 7.1.5.1p2 1537 // A variable of non-volatile const-qualified integral or enumeration 1538 // type initialized by an ICE can be used in ICEs. 1539 if (const VarDecl *Dcl = 1540 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) { 1541 if (Dcl->isInitKnownICE()) { 1542 // We have already checked whether this subexpression is an 1543 // integral constant expression. 1544 if (Dcl->isInitICE()) 1545 return NoDiag(); 1546 else 1547 return ICEDiag(2, E->getLocStart()); 1548 } 1549 1550 if (const Expr *Init = Dcl->getInit()) { 1551 ICEDiag Result = CheckICE(Init, Ctx); 1552 // Cache the result of the ICE test. 1553 Dcl->setInitKnownICE(Ctx, Result.Val == 0); 1554 return Result; 1555 } 1556 } 1557 } 1558 return ICEDiag(2, E->getLocStart()); 1559 case Expr::UnaryOperatorClass: { 1560 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1561 switch (Exp->getOpcode()) { 1562 case UnaryOperator::PostInc: 1563 case UnaryOperator::PostDec: 1564 case UnaryOperator::PreInc: 1565 case UnaryOperator::PreDec: 1566 case UnaryOperator::AddrOf: 1567 case UnaryOperator::Deref: 1568 return ICEDiag(2, E->getLocStart()); 1569 1570 case UnaryOperator::Extension: 1571 case UnaryOperator::LNot: 1572 case UnaryOperator::Plus: 1573 case UnaryOperator::Minus: 1574 case UnaryOperator::Not: 1575 case UnaryOperator::Real: 1576 case UnaryOperator::Imag: 1577 return CheckICE(Exp->getSubExpr(), Ctx); 1578 case UnaryOperator::OffsetOf: 1579 // Note that per C99, offsetof must be an ICE. And AFAIK, using 1580 // Evaluate matches the proposed gcc behavior for cases like 1581 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect 1582 // compliance: we should warn earlier for offsetof expressions with 1583 // array subscripts that aren't ICEs, and if the array subscripts 1584 // are ICEs, the value of the offsetof must be an integer constant. 1585 return CheckEvalInICE(E, Ctx); 1586 } 1587 } 1588 case Expr::SizeOfAlignOfExprClass: { 1589 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E); 1590 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType()) 1591 return ICEDiag(2, E->getLocStart()); 1592 return NoDiag(); 1593 } 1594 case Expr::BinaryOperatorClass: { 1595 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1596 switch (Exp->getOpcode()) { 1597 case BinaryOperator::PtrMemD: 1598 case BinaryOperator::PtrMemI: 1599 case BinaryOperator::Assign: 1600 case BinaryOperator::MulAssign: 1601 case BinaryOperator::DivAssign: 1602 case BinaryOperator::RemAssign: 1603 case BinaryOperator::AddAssign: 1604 case BinaryOperator::SubAssign: 1605 case BinaryOperator::ShlAssign: 1606 case BinaryOperator::ShrAssign: 1607 case BinaryOperator::AndAssign: 1608 case BinaryOperator::XorAssign: 1609 case BinaryOperator::OrAssign: 1610 return ICEDiag(2, E->getLocStart()); 1611 1612 case BinaryOperator::Mul: 1613 case BinaryOperator::Div: 1614 case BinaryOperator::Rem: 1615 case BinaryOperator::Add: 1616 case BinaryOperator::Sub: 1617 case BinaryOperator::Shl: 1618 case BinaryOperator::Shr: 1619 case BinaryOperator::LT: 1620 case BinaryOperator::GT: 1621 case BinaryOperator::LE: 1622 case BinaryOperator::GE: 1623 case BinaryOperator::EQ: 1624 case BinaryOperator::NE: 1625 case BinaryOperator::And: 1626 case BinaryOperator::Xor: 1627 case BinaryOperator::Or: 1628 case BinaryOperator::Comma: { 1629 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1630 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1631 if (Exp->getOpcode() == BinaryOperator::Div || 1632 Exp->getOpcode() == BinaryOperator::Rem) { 1633 // Evaluate gives an error for undefined Div/Rem, so make sure 1634 // we don't evaluate one. 1635 if (LHSResult.Val != 2 && RHSResult.Val != 2) { 1636 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx); 1637 if (REval == 0) 1638 return ICEDiag(1, E->getLocStart()); 1639 if (REval.isSigned() && REval.isAllOnesValue()) { 1640 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx); 1641 if (LEval.isMinSignedValue()) 1642 return ICEDiag(1, E->getLocStart()); 1643 } 1644 } 1645 } 1646 if (Exp->getOpcode() == BinaryOperator::Comma) { 1647 if (Ctx.getLangOptions().C99) { 1648 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 1649 // if it isn't evaluated. 1650 if (LHSResult.Val == 0 && RHSResult.Val == 0) 1651 return ICEDiag(1, E->getLocStart()); 1652 } else { 1653 // In both C89 and C++, commas in ICEs are illegal. 1654 return ICEDiag(2, E->getLocStart()); 1655 } 1656 } 1657 if (LHSResult.Val >= RHSResult.Val) 1658 return LHSResult; 1659 return RHSResult; 1660 } 1661 case BinaryOperator::LAnd: 1662 case BinaryOperator::LOr: { 1663 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 1664 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 1665 if (LHSResult.Val == 0 && RHSResult.Val == 1) { 1666 // Rare case where the RHS has a comma "side-effect"; we need 1667 // to actually check the condition to see whether the side 1668 // with the comma is evaluated. 1669 if ((Exp->getOpcode() == BinaryOperator::LAnd) != 1670 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0)) 1671 return RHSResult; 1672 return NoDiag(); 1673 } 1674 1675 if (LHSResult.Val >= RHSResult.Val) 1676 return LHSResult; 1677 return RHSResult; 1678 } 1679 } 1680 } 1681 case Expr::CastExprClass: 1682 case Expr::ImplicitCastExprClass: 1683 case Expr::ExplicitCastExprClass: 1684 case Expr::CStyleCastExprClass: 1685 case Expr::CXXFunctionalCastExprClass: 1686 case Expr::CXXNamedCastExprClass: 1687 case Expr::CXXStaticCastExprClass: 1688 case Expr::CXXReinterpretCastExprClass: 1689 case Expr::CXXConstCastExprClass: { 1690 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 1691 if (SubExpr->getType()->isIntegralType()) 1692 return CheckICE(SubExpr, Ctx); 1693 if (isa<FloatingLiteral>(SubExpr->IgnoreParens())) 1694 return NoDiag(); 1695 return ICEDiag(2, E->getLocStart()); 1696 } 1697 case Expr::ConditionalOperatorClass: { 1698 const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 1699 // If the condition (ignoring parens) is a __builtin_constant_p call, 1700 // then only the true side is actually considered in an integer constant 1701 // expression, and it is fully evaluated. This is an important GNU 1702 // extension. See GCC PR38377 for discussion. 1703 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 1704 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) { 1705 Expr::EvalResult EVResult; 1706 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects || 1707 !EVResult.Val.isInt()) { 1708 return ICEDiag(2, E->getLocStart()); 1709 } 1710 return NoDiag(); 1711 } 1712 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 1713 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 1714 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 1715 if (CondResult.Val == 2) 1716 return CondResult; 1717 if (TrueResult.Val == 2) 1718 return TrueResult; 1719 if (FalseResult.Val == 2) 1720 return FalseResult; 1721 if (CondResult.Val == 1) 1722 return CondResult; 1723 if (TrueResult.Val == 0 && FalseResult.Val == 0) 1724 return NoDiag(); 1725 // Rare case where the diagnostics depend on which side is evaluated 1726 // Note that if we get here, CondResult is 0, and at least one of 1727 // TrueResult and FalseResult is non-zero. 1728 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) { 1729 return FalseResult; 1730 } 1731 return TrueResult; 1732 } 1733 case Expr::CXXDefaultArgExprClass: 1734 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 1735 case Expr::ChooseExprClass: { 1736 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 1737 } 1738 } 1739 1740 // Silence a GCC warning 1741 return ICEDiag(2, E->getLocStart()); 1742} 1743 1744bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 1745 SourceLocation *Loc, bool isEvaluated) const { 1746 ICEDiag d = CheckICE(this, Ctx); 1747 if (d.Val != 0) { 1748 if (Loc) *Loc = d.Loc; 1749 return false; 1750 } 1751 EvalResult EvalResult; 1752 if (!Evaluate(EvalResult, Ctx)) 1753 assert(0 && "ICE cannot be evaluated!"); 1754 assert(!EvalResult.HasSideEffects && "ICE with side effects!"); 1755 assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); 1756 Result = EvalResult.Val.getInt(); 1757 return true; 1758} 1759 1760/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1761/// integer constant expression with the value zero, or if this is one that is 1762/// cast to void*. 1763bool Expr::isNullPointerConstant(ASTContext &Ctx, 1764 NullPointerConstantValueDependence NPC) const { 1765 if (isValueDependent()) { 1766 switch (NPC) { 1767 case NPC_NeverValueDependent: 1768 assert(false && "Unexpected value dependent expression!"); 1769 // If the unthinkable happens, fall through to the safest alternative. 1770 1771 case NPC_ValueDependentIsNull: 1772 return isTypeDependent() || getType()->isIntegralType(); 1773 1774 case NPC_ValueDependentIsNotNull: 1775 return false; 1776 } 1777 } 1778 1779 // Strip off a cast to void*, if it exists. Except in C++. 1780 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1781 if (!Ctx.getLangOptions().CPlusPlus) { 1782 // Check that it is a cast to void*. 1783 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1784 QualType Pointee = PT->getPointeeType(); 1785 if (!Pointee.hasQualifiers() && 1786 Pointee->isVoidType() && // to void* 1787 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1788 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1789 } 1790 } 1791 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1792 // Ignore the ImplicitCastExpr type entirely. 1793 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1794 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1795 // Accept ((void*)0) as a null pointer constant, as many other 1796 // implementations do. 1797 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1798 } else if (const CXXDefaultArgExpr *DefaultArg 1799 = dyn_cast<CXXDefaultArgExpr>(this)) { 1800 // See through default argument expressions 1801 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1802 } else if (isa<GNUNullExpr>(this)) { 1803 // The GNU __null extension is always a null pointer constant. 1804 return true; 1805 } 1806 1807 // C++0x nullptr_t is always a null pointer constant. 1808 if (getType()->isNullPtrType()) 1809 return true; 1810 1811 // This expression must be an integer type. 1812 if (!getType()->isIntegerType() || 1813 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1814 return false; 1815 1816 // If we have an integer constant expression, we need to *evaluate* it and 1817 // test for the value 0. 1818 llvm::APSInt Result; 1819 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1820} 1821 1822FieldDecl *Expr::getBitField() { 1823 Expr *E = this->IgnoreParens(); 1824 1825 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1826 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1827 if (Field->isBitField()) 1828 return Field; 1829 1830 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1831 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1832 return BinOp->getLHS()->getBitField(); 1833 1834 return 0; 1835} 1836 1837/// isArrow - Return true if the base expression is a pointer to vector, 1838/// return false if the base expression is a vector. 1839bool ExtVectorElementExpr::isArrow() const { 1840 return getBase()->getType()->isPointerType(); 1841} 1842 1843unsigned ExtVectorElementExpr::getNumElements() const { 1844 if (const VectorType *VT = getType()->getAs<VectorType>()) 1845 return VT->getNumElements(); 1846 return 1; 1847} 1848 1849/// containsDuplicateElements - Return true if any element access is repeated. 1850bool ExtVectorElementExpr::containsDuplicateElements() const { 1851 // FIXME: Refactor this code to an accessor on the AST node which returns the 1852 // "type" of component access, and share with code below and in Sema. 1853 llvm::StringRef Comp = Accessor->getName(); 1854 1855 // Halving swizzles do not contain duplicate elements. 1856 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1857 return false; 1858 1859 // Advance past s-char prefix on hex swizzles. 1860 if (Comp[0] == 's' || Comp[0] == 'S') 1861 Comp = Comp.substr(1); 1862 1863 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1864 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1865 return true; 1866 1867 return false; 1868} 1869 1870/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1871void ExtVectorElementExpr::getEncodedElementAccess( 1872 llvm::SmallVectorImpl<unsigned> &Elts) const { 1873 llvm::StringRef Comp = Accessor->getName(); 1874 if (Comp[0] == 's' || Comp[0] == 'S') 1875 Comp = Comp.substr(1); 1876 1877 bool isHi = Comp == "hi"; 1878 bool isLo = Comp == "lo"; 1879 bool isEven = Comp == "even"; 1880 bool isOdd = Comp == "odd"; 1881 1882 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1883 uint64_t Index; 1884 1885 if (isHi) 1886 Index = e + i; 1887 else if (isLo) 1888 Index = i; 1889 else if (isEven) 1890 Index = 2 * i; 1891 else if (isOdd) 1892 Index = 2 * i + 1; 1893 else 1894 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1895 1896 Elts.push_back(Index); 1897 } 1898} 1899 1900// constructor for instance messages. 1901ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1902 QualType retType, ObjCMethodDecl *mproto, 1903 SourceLocation LBrac, SourceLocation RBrac, 1904 Expr **ArgExprs, unsigned nargs) 1905 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1906 MethodProto(mproto) { 1907 NumArgs = nargs; 1908 SubExprs = new Stmt*[NumArgs+1]; 1909 SubExprs[RECEIVER] = receiver; 1910 if (NumArgs) { 1911 for (unsigned i = 0; i != NumArgs; ++i) 1912 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1913 } 1914 LBracloc = LBrac; 1915 RBracloc = RBrac; 1916} 1917 1918// constructor for class messages. 1919// FIXME: clsName should be typed to ObjCInterfaceType 1920ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1921 QualType retType, ObjCMethodDecl *mproto, 1922 SourceLocation LBrac, SourceLocation RBrac, 1923 Expr **ArgExprs, unsigned nargs) 1924 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1925 MethodProto(mproto) { 1926 NumArgs = nargs; 1927 SubExprs = new Stmt*[NumArgs+1]; 1928 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown); 1929 if (NumArgs) { 1930 for (unsigned i = 0; i != NumArgs; ++i) 1931 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1932 } 1933 LBracloc = LBrac; 1934 RBracloc = RBrac; 1935} 1936 1937// constructor for class messages. 1938ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo, 1939 QualType retType, ObjCMethodDecl *mproto, 1940 SourceLocation LBrac, SourceLocation RBrac, 1941 Expr **ArgExprs, unsigned nargs) 1942: Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1943MethodProto(mproto) { 1944 NumArgs = nargs; 1945 SubExprs = new Stmt*[NumArgs+1]; 1946 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown); 1947 if (NumArgs) { 1948 for (unsigned i = 0; i != NumArgs; ++i) 1949 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1950 } 1951 LBracloc = LBrac; 1952 RBracloc = RBrac; 1953} 1954 1955ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const { 1956 uintptr_t x = (uintptr_t) SubExprs[RECEIVER]; 1957 switch (x & Flags) { 1958 default: 1959 assert(false && "Invalid ObjCMessageExpr."); 1960 case IsInstMeth: 1961 return ClassInfo(0, 0); 1962 case IsClsMethDeclUnknown: 1963 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags)); 1964 case IsClsMethDeclKnown: { 1965 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags); 1966 return ClassInfo(D, D->getIdentifier()); 1967 } 1968 } 1969} 1970 1971void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) { 1972 if (CI.first == 0 && CI.second == 0) 1973 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth); 1974 else if (CI.first == 0) 1975 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown); 1976 else 1977 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown); 1978} 1979 1980 1981bool ChooseExpr::isConditionTrue(ASTContext &C) const { 1982 return getCond()->EvaluateAsInt(C) != 0; 1983} 1984 1985void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 1986 unsigned NumExprs) { 1987 if (SubExprs) C.Deallocate(SubExprs); 1988 1989 SubExprs = new (C) Stmt* [NumExprs]; 1990 this->NumExprs = NumExprs; 1991 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 1992} 1993 1994void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 1995 DestroyChildren(C); 1996 if (SubExprs) C.Deallocate(SubExprs); 1997 this->~ShuffleVectorExpr(); 1998 C.Deallocate(this); 1999} 2000 2001void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2002 // Override default behavior of traversing children. If this has a type 2003 // operand and the type is a variable-length array, the child iteration 2004 // will iterate over the size expression. However, this expression belongs 2005 // to the type, not to this, so we don't want to delete it. 2006 // We still want to delete this expression. 2007 if (isArgumentType()) { 2008 this->~SizeOfAlignOfExpr(); 2009 C.Deallocate(this); 2010 } 2011 else 2012 Expr::DoDestroy(C); 2013} 2014 2015//===----------------------------------------------------------------------===// 2016// DesignatedInitExpr 2017//===----------------------------------------------------------------------===// 2018 2019IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2020 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2021 if (Field.NameOrField & 0x01) 2022 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2023 else 2024 return getField()->getIdentifier(); 2025} 2026 2027DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2028 const Designator *Designators, 2029 SourceLocation EqualOrColonLoc, 2030 bool GNUSyntax, 2031 Expr **IndexExprs, 2032 unsigned NumIndexExprs, 2033 Expr *Init) 2034 : Expr(DesignatedInitExprClass, Ty, 2035 Init->isTypeDependent(), Init->isValueDependent()), 2036 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2037 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2038 this->Designators = new Designator[NumDesignators]; 2039 2040 // Record the initializer itself. 2041 child_iterator Child = child_begin(); 2042 *Child++ = Init; 2043 2044 // Copy the designators and their subexpressions, computing 2045 // value-dependence along the way. 2046 unsigned IndexIdx = 0; 2047 for (unsigned I = 0; I != NumDesignators; ++I) { 2048 this->Designators[I] = Designators[I]; 2049 2050 if (this->Designators[I].isArrayDesignator()) { 2051 // Compute type- and value-dependence. 2052 Expr *Index = IndexExprs[IndexIdx]; 2053 ValueDependent = ValueDependent || 2054 Index->isTypeDependent() || Index->isValueDependent(); 2055 2056 // Copy the index expressions into permanent storage. 2057 *Child++ = IndexExprs[IndexIdx++]; 2058 } else if (this->Designators[I].isArrayRangeDesignator()) { 2059 // Compute type- and value-dependence. 2060 Expr *Start = IndexExprs[IndexIdx]; 2061 Expr *End = IndexExprs[IndexIdx + 1]; 2062 ValueDependent = ValueDependent || 2063 Start->isTypeDependent() || Start->isValueDependent() || 2064 End->isTypeDependent() || End->isValueDependent(); 2065 2066 // Copy the start/end expressions into permanent storage. 2067 *Child++ = IndexExprs[IndexIdx++]; 2068 *Child++ = IndexExprs[IndexIdx++]; 2069 } 2070 } 2071 2072 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2073} 2074 2075DesignatedInitExpr * 2076DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2077 unsigned NumDesignators, 2078 Expr **IndexExprs, unsigned NumIndexExprs, 2079 SourceLocation ColonOrEqualLoc, 2080 bool UsesColonSyntax, Expr *Init) { 2081 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2082 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2083 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators, 2084 ColonOrEqualLoc, UsesColonSyntax, 2085 IndexExprs, NumIndexExprs, Init); 2086} 2087 2088DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2089 unsigned NumIndexExprs) { 2090 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2091 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2092 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2093} 2094 2095void DesignatedInitExpr::setDesignators(const Designator *Desigs, 2096 unsigned NumDesigs) { 2097 if (Designators) 2098 delete [] Designators; 2099 2100 Designators = new Designator[NumDesigs]; 2101 NumDesignators = NumDesigs; 2102 for (unsigned I = 0; I != NumDesigs; ++I) 2103 Designators[I] = Desigs[I]; 2104} 2105 2106SourceRange DesignatedInitExpr::getSourceRange() const { 2107 SourceLocation StartLoc; 2108 Designator &First = 2109 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2110 if (First.isFieldDesignator()) { 2111 if (GNUSyntax) 2112 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2113 else 2114 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2115 } else 2116 StartLoc = 2117 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2118 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2119} 2120 2121Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2122 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2123 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2124 Ptr += sizeof(DesignatedInitExpr); 2125 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2126 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2127} 2128 2129Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2130 assert(D.Kind == Designator::ArrayRangeDesignator && 2131 "Requires array range designator"); 2132 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2133 Ptr += sizeof(DesignatedInitExpr); 2134 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2135 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2136} 2137 2138Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2139 assert(D.Kind == Designator::ArrayRangeDesignator && 2140 "Requires array range designator"); 2141 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2142 Ptr += sizeof(DesignatedInitExpr); 2143 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2144 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2145} 2146 2147/// \brief Replaces the designator at index @p Idx with the series 2148/// of designators in [First, Last). 2149void DesignatedInitExpr::ExpandDesignator(unsigned Idx, 2150 const Designator *First, 2151 const Designator *Last) { 2152 unsigned NumNewDesignators = Last - First; 2153 if (NumNewDesignators == 0) { 2154 std::copy_backward(Designators + Idx + 1, 2155 Designators + NumDesignators, 2156 Designators + Idx); 2157 --NumNewDesignators; 2158 return; 2159 } else if (NumNewDesignators == 1) { 2160 Designators[Idx] = *First; 2161 return; 2162 } 2163 2164 Designator *NewDesignators 2165 = new Designator[NumDesignators - 1 + NumNewDesignators]; 2166 std::copy(Designators, Designators + Idx, NewDesignators); 2167 std::copy(First, Last, NewDesignators + Idx); 2168 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2169 NewDesignators + Idx + NumNewDesignators); 2170 delete [] Designators; 2171 Designators = NewDesignators; 2172 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2173} 2174 2175void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2176 delete [] Designators; 2177 Expr::DoDestroy(C); 2178} 2179 2180ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2181 Expr **exprs, unsigned nexprs, 2182 SourceLocation rparenloc) 2183: Expr(ParenListExprClass, QualType(), 2184 hasAnyTypeDependentArguments(exprs, nexprs), 2185 hasAnyValueDependentArguments(exprs, nexprs)), 2186 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2187 2188 Exprs = new (C) Stmt*[nexprs]; 2189 for (unsigned i = 0; i != nexprs; ++i) 2190 Exprs[i] = exprs[i]; 2191} 2192 2193void ParenListExpr::DoDestroy(ASTContext& C) { 2194 DestroyChildren(C); 2195 if (Exprs) C.Deallocate(Exprs); 2196 this->~ParenListExpr(); 2197 C.Deallocate(this); 2198} 2199 2200//===----------------------------------------------------------------------===// 2201// ExprIterator. 2202//===----------------------------------------------------------------------===// 2203 2204Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2205Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2206Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2207const Expr* ConstExprIterator::operator[](size_t idx) const { 2208 return cast<Expr>(I[idx]); 2209} 2210const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2211const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2212 2213//===----------------------------------------------------------------------===// 2214// Child Iterators for iterating over subexpressions/substatements 2215//===----------------------------------------------------------------------===// 2216 2217// DeclRefExpr 2218Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2219Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2220 2221// ObjCIvarRefExpr 2222Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2223Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2224 2225// ObjCPropertyRefExpr 2226Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2227Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2228 2229// ObjCImplicitSetterGetterRefExpr 2230Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2231 return &Base; 2232} 2233Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2234 return &Base+1; 2235} 2236 2237// ObjCSuperExpr 2238Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2239Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2240 2241// ObjCIsaExpr 2242Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2243Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2244 2245// PredefinedExpr 2246Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2247Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2248 2249// IntegerLiteral 2250Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2251Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2252 2253// CharacterLiteral 2254Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2255Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2256 2257// FloatingLiteral 2258Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2259Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2260 2261// ImaginaryLiteral 2262Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2263Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2264 2265// StringLiteral 2266Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2267Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2268 2269// ParenExpr 2270Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2271Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2272 2273// UnaryOperator 2274Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2275Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2276 2277// SizeOfAlignOfExpr 2278Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2279 // If this is of a type and the type is a VLA type (and not a typedef), the 2280 // size expression of the VLA needs to be treated as an executable expression. 2281 // Why isn't this weirdness documented better in StmtIterator? 2282 if (isArgumentType()) { 2283 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2284 getArgumentType().getTypePtr())) 2285 return child_iterator(T); 2286 return child_iterator(); 2287 } 2288 return child_iterator(&Argument.Ex); 2289} 2290Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2291 if (isArgumentType()) 2292 return child_iterator(); 2293 return child_iterator(&Argument.Ex + 1); 2294} 2295 2296// ArraySubscriptExpr 2297Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2298 return &SubExprs[0]; 2299} 2300Stmt::child_iterator ArraySubscriptExpr::child_end() { 2301 return &SubExprs[0]+END_EXPR; 2302} 2303 2304// CallExpr 2305Stmt::child_iterator CallExpr::child_begin() { 2306 return &SubExprs[0]; 2307} 2308Stmt::child_iterator CallExpr::child_end() { 2309 return &SubExprs[0]+NumArgs+ARGS_START; 2310} 2311 2312// MemberExpr 2313Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2314Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2315 2316// ExtVectorElementExpr 2317Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2318Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2319 2320// CompoundLiteralExpr 2321Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2322Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2323 2324// CastExpr 2325Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2326Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2327 2328// BinaryOperator 2329Stmt::child_iterator BinaryOperator::child_begin() { 2330 return &SubExprs[0]; 2331} 2332Stmt::child_iterator BinaryOperator::child_end() { 2333 return &SubExprs[0]+END_EXPR; 2334} 2335 2336// ConditionalOperator 2337Stmt::child_iterator ConditionalOperator::child_begin() { 2338 return &SubExprs[0]; 2339} 2340Stmt::child_iterator ConditionalOperator::child_end() { 2341 return &SubExprs[0]+END_EXPR; 2342} 2343 2344// AddrLabelExpr 2345Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2346Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2347 2348// StmtExpr 2349Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2350Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2351 2352// TypesCompatibleExpr 2353Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2354 return child_iterator(); 2355} 2356 2357Stmt::child_iterator TypesCompatibleExpr::child_end() { 2358 return child_iterator(); 2359} 2360 2361// ChooseExpr 2362Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2363Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2364 2365// GNUNullExpr 2366Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2367Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2368 2369// ShuffleVectorExpr 2370Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2371 return &SubExprs[0]; 2372} 2373Stmt::child_iterator ShuffleVectorExpr::child_end() { 2374 return &SubExprs[0]+NumExprs; 2375} 2376 2377// VAArgExpr 2378Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2379Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2380 2381// InitListExpr 2382Stmt::child_iterator InitListExpr::child_begin() { 2383 return InitExprs.size() ? &InitExprs[0] : 0; 2384} 2385Stmt::child_iterator InitListExpr::child_end() { 2386 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2387} 2388 2389// DesignatedInitExpr 2390Stmt::child_iterator DesignatedInitExpr::child_begin() { 2391 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2392 Ptr += sizeof(DesignatedInitExpr); 2393 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2394} 2395Stmt::child_iterator DesignatedInitExpr::child_end() { 2396 return child_iterator(&*child_begin() + NumSubExprs); 2397} 2398 2399// ImplicitValueInitExpr 2400Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2401 return child_iterator(); 2402} 2403 2404Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2405 return child_iterator(); 2406} 2407 2408// ParenListExpr 2409Stmt::child_iterator ParenListExpr::child_begin() { 2410 return &Exprs[0]; 2411} 2412Stmt::child_iterator ParenListExpr::child_end() { 2413 return &Exprs[0]+NumExprs; 2414} 2415 2416// ObjCStringLiteral 2417Stmt::child_iterator ObjCStringLiteral::child_begin() { 2418 return &String; 2419} 2420Stmt::child_iterator ObjCStringLiteral::child_end() { 2421 return &String+1; 2422} 2423 2424// ObjCEncodeExpr 2425Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2426Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2427 2428// ObjCSelectorExpr 2429Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2430 return child_iterator(); 2431} 2432Stmt::child_iterator ObjCSelectorExpr::child_end() { 2433 return child_iterator(); 2434} 2435 2436// ObjCProtocolExpr 2437Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2438 return child_iterator(); 2439} 2440Stmt::child_iterator ObjCProtocolExpr::child_end() { 2441 return child_iterator(); 2442} 2443 2444// ObjCMessageExpr 2445Stmt::child_iterator ObjCMessageExpr::child_begin() { 2446 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START; 2447} 2448Stmt::child_iterator ObjCMessageExpr::child_end() { 2449 return &SubExprs[0]+ARGS_START+getNumArgs(); 2450} 2451 2452// Blocks 2453Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2454Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2455 2456Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2457Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2458