Expr.cpp revision 1fe85ea697fb5c85acded3ac0ddbc19f89c2e181
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/Lex/LiteralSupport.h" 24#include "clang/Lex/Lexer.h" 25#include "clang/Basic/Builtins.h" 26#include "clang/Basic/SourceManager.h" 27#include "clang/Basic/TargetInfo.h" 28#include "llvm/Support/ErrorHandling.h" 29#include "llvm/Support/raw_ostream.h" 30#include <algorithm> 31using namespace clang; 32 33void Expr::ANCHOR() {} // key function for Expr class. 34 35/// isKnownToHaveBooleanValue - Return true if this is an integer expression 36/// that is known to return 0 or 1. This happens for _Bool/bool expressions 37/// but also int expressions which are produced by things like comparisons in 38/// C. 39bool Expr::isKnownToHaveBooleanValue() const { 40 // If this value has _Bool type, it is obvious 0/1. 41 if (getType()->isBooleanType()) return true; 42 // If this is a non-scalar-integer type, we don't care enough to try. 43 if (!getType()->isIntegralOrEnumerationType()) return false; 44 45 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 46 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 47 48 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 49 switch (UO->getOpcode()) { 50 case UO_Plus: 51 case UO_Extension: 52 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 53 default: 54 return false; 55 } 56 } 57 58 // Only look through implicit casts. If the user writes 59 // '(int) (a && b)' treat it as an arbitrary int. 60 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(this)) 61 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 62 63 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 64 switch (BO->getOpcode()) { 65 default: return false; 66 case BO_LT: // Relational operators. 67 case BO_GT: 68 case BO_LE: 69 case BO_GE: 70 case BO_EQ: // Equality operators. 71 case BO_NE: 72 case BO_LAnd: // AND operator. 73 case BO_LOr: // Logical OR operator. 74 return true; 75 76 case BO_And: // Bitwise AND operator. 77 case BO_Xor: // Bitwise XOR operator. 78 case BO_Or: // Bitwise OR operator. 79 // Handle things like (x==2)|(y==12). 80 return BO->getLHS()->isKnownToHaveBooleanValue() && 81 BO->getRHS()->isKnownToHaveBooleanValue(); 82 83 case BO_Comma: 84 case BO_Assign: 85 return BO->getRHS()->isKnownToHaveBooleanValue(); 86 } 87 } 88 89 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 90 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 91 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 92 93 return false; 94} 95 96//===----------------------------------------------------------------------===// 97// Primary Expressions. 98//===----------------------------------------------------------------------===// 99 100void ExplicitTemplateArgumentList::initializeFrom( 101 const TemplateArgumentListInfo &Info) { 102 LAngleLoc = Info.getLAngleLoc(); 103 RAngleLoc = Info.getRAngleLoc(); 104 NumTemplateArgs = Info.size(); 105 106 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 107 for (unsigned i = 0; i != NumTemplateArgs; ++i) 108 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 109} 110 111void ExplicitTemplateArgumentList::initializeFrom( 112 const TemplateArgumentListInfo &Info, 113 bool &Dependent, 114 bool &ContainsUnexpandedParameterPack) { 115 LAngleLoc = Info.getLAngleLoc(); 116 RAngleLoc = Info.getRAngleLoc(); 117 NumTemplateArgs = Info.size(); 118 119 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 120 for (unsigned i = 0; i != NumTemplateArgs; ++i) { 121 Dependent = Dependent || Info[i].getArgument().isDependent(); 122 ContainsUnexpandedParameterPack 123 = ContainsUnexpandedParameterPack || 124 Info[i].getArgument().containsUnexpandedParameterPack(); 125 126 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 127 } 128} 129 130void ExplicitTemplateArgumentList::copyInto( 131 TemplateArgumentListInfo &Info) const { 132 Info.setLAngleLoc(LAngleLoc); 133 Info.setRAngleLoc(RAngleLoc); 134 for (unsigned I = 0; I != NumTemplateArgs; ++I) 135 Info.addArgument(getTemplateArgs()[I]); 136} 137 138std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { 139 return sizeof(ExplicitTemplateArgumentList) + 140 sizeof(TemplateArgumentLoc) * NumTemplateArgs; 141} 142 143std::size_t ExplicitTemplateArgumentList::sizeFor( 144 const TemplateArgumentListInfo &Info) { 145 return sizeFor(Info.size()); 146} 147 148void DeclRefExpr::computeDependence() { 149 ExprBits.TypeDependent = false; 150 ExprBits.ValueDependent = false; 151 152 NamedDecl *D = getDecl(); 153 154 // (TD) C++ [temp.dep.expr]p3: 155 // An id-expression is type-dependent if it contains: 156 // 157 // and 158 // 159 // (VD) C++ [temp.dep.constexpr]p2: 160 // An identifier is value-dependent if it is: 161 162 // (TD) - an identifier that was declared with dependent type 163 // (VD) - a name declared with a dependent type, 164 if (getType()->isDependentType()) { 165 ExprBits.TypeDependent = true; 166 ExprBits.ValueDependent = true; 167 } 168 // (TD) - a conversion-function-id that specifies a dependent type 169 else if (D->getDeclName().getNameKind() 170 == DeclarationName::CXXConversionFunctionName && 171 D->getDeclName().getCXXNameType()->isDependentType()) { 172 ExprBits.TypeDependent = true; 173 ExprBits.ValueDependent = true; 174 } 175 // (TD) - a template-id that is dependent, 176 else if (hasExplicitTemplateArgs() && 177 TemplateSpecializationType::anyDependentTemplateArguments( 178 getTemplateArgs(), 179 getNumTemplateArgs())) { 180 ExprBits.TypeDependent = true; 181 ExprBits.ValueDependent = true; 182 } 183 // (VD) - the name of a non-type template parameter, 184 else if (isa<NonTypeTemplateParmDecl>(D)) 185 ExprBits.ValueDependent = true; 186 // (VD) - a constant with integral or enumeration type and is 187 // initialized with an expression that is value-dependent. 188 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 189 if (Var->getType()->isIntegralOrEnumerationType() && 190 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 191 if (const Expr *Init = Var->getAnyInitializer()) 192 if (Init->isValueDependent()) 193 ExprBits.ValueDependent = true; 194 } 195 // (VD) - FIXME: Missing from the standard: 196 // - a member function or a static data member of the current 197 // instantiation 198 else if (Var->isStaticDataMember() && 199 Var->getDeclContext()->isDependentContext()) 200 ExprBits.ValueDependent = true; 201 } 202 // (VD) - FIXME: Missing from the standard: 203 // - a member function or a static data member of the current 204 // instantiation 205 else if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) 206 ExprBits.ValueDependent = true; 207 // (TD) - a nested-name-specifier or a qualified-id that names a 208 // member of an unknown specialization. 209 // (handled by DependentScopeDeclRefExpr) 210 211 // Determine whether this expression contains any unexpanded parameter 212 // packs. 213 // Is the declaration a parameter pack? 214 if (D->isParameterPack()) 215 ExprBits.ContainsUnexpandedParameterPack = true; 216} 217 218DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 219 SourceRange QualifierRange, 220 ValueDecl *D, SourceLocation NameLoc, 221 const TemplateArgumentListInfo *TemplateArgs, 222 QualType T, ExprValueKind VK) 223 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 224 DecoratedD(D, 225 (Qualifier? HasQualifierFlag : 0) | 226 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 227 Loc(NameLoc) { 228 if (Qualifier) { 229 NameQualifier *NQ = getNameQualifier(); 230 NQ->NNS = Qualifier; 231 NQ->Range = QualifierRange; 232 } 233 234 if (TemplateArgs) 235 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 236 237 computeDependence(); 238} 239 240DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 241 SourceRange QualifierRange, 242 ValueDecl *D, const DeclarationNameInfo &NameInfo, 243 const TemplateArgumentListInfo *TemplateArgs, 244 QualType T, ExprValueKind VK) 245 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 246 DecoratedD(D, 247 (Qualifier? HasQualifierFlag : 0) | 248 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 249 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 250 if (Qualifier) { 251 NameQualifier *NQ = getNameQualifier(); 252 NQ->NNS = Qualifier; 253 NQ->Range = QualifierRange; 254 } 255 256 if (TemplateArgs) 257 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 258 259 computeDependence(); 260} 261 262DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 263 NestedNameSpecifier *Qualifier, 264 SourceRange QualifierRange, 265 ValueDecl *D, 266 SourceLocation NameLoc, 267 QualType T, 268 ExprValueKind VK, 269 const TemplateArgumentListInfo *TemplateArgs) { 270 return Create(Context, Qualifier, QualifierRange, D, 271 DeclarationNameInfo(D->getDeclName(), NameLoc), 272 T, VK, TemplateArgs); 273} 274 275DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 276 NestedNameSpecifier *Qualifier, 277 SourceRange QualifierRange, 278 ValueDecl *D, 279 const DeclarationNameInfo &NameInfo, 280 QualType T, 281 ExprValueKind VK, 282 const TemplateArgumentListInfo *TemplateArgs) { 283 std::size_t Size = sizeof(DeclRefExpr); 284 if (Qualifier != 0) 285 Size += sizeof(NameQualifier); 286 287 if (TemplateArgs) 288 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 289 290 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 291 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 292 TemplateArgs, T, VK); 293} 294 295DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, bool HasQualifier, 296 unsigned NumTemplateArgs) { 297 std::size_t Size = sizeof(DeclRefExpr); 298 if (HasQualifier) 299 Size += sizeof(NameQualifier); 300 301 if (NumTemplateArgs) 302 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 303 304 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 305 return new (Mem) DeclRefExpr(EmptyShell()); 306} 307 308SourceRange DeclRefExpr::getSourceRange() const { 309 SourceRange R = getNameInfo().getSourceRange(); 310 if (hasQualifier()) 311 R.setBegin(getQualifierRange().getBegin()); 312 if (hasExplicitTemplateArgs()) 313 R.setEnd(getRAngleLoc()); 314 return R; 315} 316 317// FIXME: Maybe this should use DeclPrinter with a special "print predefined 318// expr" policy instead. 319std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 320 ASTContext &Context = CurrentDecl->getASTContext(); 321 322 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 323 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 324 return FD->getNameAsString(); 325 326 llvm::SmallString<256> Name; 327 llvm::raw_svector_ostream Out(Name); 328 329 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 330 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 331 Out << "virtual "; 332 if (MD->isStatic()) 333 Out << "static "; 334 } 335 336 PrintingPolicy Policy(Context.getLangOptions()); 337 338 std::string Proto = FD->getQualifiedNameAsString(Policy); 339 340 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 341 const FunctionProtoType *FT = 0; 342 if (FD->hasWrittenPrototype()) 343 FT = dyn_cast<FunctionProtoType>(AFT); 344 345 Proto += "("; 346 if (FT) { 347 llvm::raw_string_ostream POut(Proto); 348 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 349 if (i) POut << ", "; 350 std::string Param; 351 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 352 POut << Param; 353 } 354 355 if (FT->isVariadic()) { 356 if (FD->getNumParams()) POut << ", "; 357 POut << "..."; 358 } 359 } 360 Proto += ")"; 361 362 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 363 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 364 if (ThisQuals.hasConst()) 365 Proto += " const"; 366 if (ThisQuals.hasVolatile()) 367 Proto += " volatile"; 368 } 369 370 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 371 AFT->getResultType().getAsStringInternal(Proto, Policy); 372 373 Out << Proto; 374 375 Out.flush(); 376 return Name.str().str(); 377 } 378 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 379 llvm::SmallString<256> Name; 380 llvm::raw_svector_ostream Out(Name); 381 Out << (MD->isInstanceMethod() ? '-' : '+'); 382 Out << '['; 383 384 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 385 // a null check to avoid a crash. 386 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 387 Out << ID; 388 389 if (const ObjCCategoryImplDecl *CID = 390 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 391 Out << '(' << CID << ')'; 392 393 Out << ' '; 394 Out << MD->getSelector().getAsString(); 395 Out << ']'; 396 397 Out.flush(); 398 return Name.str().str(); 399 } 400 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 401 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 402 return "top level"; 403 } 404 return ""; 405} 406 407void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 408 if (hasAllocation()) 409 C.Deallocate(pVal); 410 411 BitWidth = Val.getBitWidth(); 412 unsigned NumWords = Val.getNumWords(); 413 const uint64_t* Words = Val.getRawData(); 414 if (NumWords > 1) { 415 pVal = new (C) uint64_t[NumWords]; 416 std::copy(Words, Words + NumWords, pVal); 417 } else if (NumWords == 1) 418 VAL = Words[0]; 419 else 420 VAL = 0; 421} 422 423IntegerLiteral * 424IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 425 QualType type, SourceLocation l) { 426 return new (C) IntegerLiteral(C, V, type, l); 427} 428 429IntegerLiteral * 430IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 431 return new (C) IntegerLiteral(Empty); 432} 433 434FloatingLiteral * 435FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 436 bool isexact, QualType Type, SourceLocation L) { 437 return new (C) FloatingLiteral(C, V, isexact, Type, L); 438} 439 440FloatingLiteral * 441FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 442 return new (C) FloatingLiteral(Empty); 443} 444 445/// getValueAsApproximateDouble - This returns the value as an inaccurate 446/// double. Note that this may cause loss of precision, but is useful for 447/// debugging dumps, etc. 448double FloatingLiteral::getValueAsApproximateDouble() const { 449 llvm::APFloat V = getValue(); 450 bool ignored; 451 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 452 &ignored); 453 return V.convertToDouble(); 454} 455 456StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 457 unsigned ByteLength, bool Wide, 458 QualType Ty, 459 const SourceLocation *Loc, 460 unsigned NumStrs) { 461 // Allocate enough space for the StringLiteral plus an array of locations for 462 // any concatenated string tokens. 463 void *Mem = C.Allocate(sizeof(StringLiteral)+ 464 sizeof(SourceLocation)*(NumStrs-1), 465 llvm::alignOf<StringLiteral>()); 466 StringLiteral *SL = new (Mem) StringLiteral(Ty); 467 468 // OPTIMIZE: could allocate this appended to the StringLiteral. 469 char *AStrData = new (C, 1) char[ByteLength]; 470 memcpy(AStrData, StrData, ByteLength); 471 SL->StrData = AStrData; 472 SL->ByteLength = ByteLength; 473 SL->IsWide = Wide; 474 SL->TokLocs[0] = Loc[0]; 475 SL->NumConcatenated = NumStrs; 476 477 if (NumStrs != 1) 478 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 479 return SL; 480} 481 482StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 483 void *Mem = C.Allocate(sizeof(StringLiteral)+ 484 sizeof(SourceLocation)*(NumStrs-1), 485 llvm::alignOf<StringLiteral>()); 486 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 487 SL->StrData = 0; 488 SL->ByteLength = 0; 489 SL->NumConcatenated = NumStrs; 490 return SL; 491} 492 493void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 494 char *AStrData = new (C, 1) char[Str.size()]; 495 memcpy(AStrData, Str.data(), Str.size()); 496 StrData = AStrData; 497 ByteLength = Str.size(); 498} 499 500/// getLocationOfByte - Return a source location that points to the specified 501/// byte of this string literal. 502/// 503/// Strings are amazingly complex. They can be formed from multiple tokens and 504/// can have escape sequences in them in addition to the usual trigraph and 505/// escaped newline business. This routine handles this complexity. 506/// 507SourceLocation StringLiteral:: 508getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 509 const LangOptions &Features, const TargetInfo &Target) const { 510 assert(!isWide() && "This doesn't work for wide strings yet"); 511 512 // Loop over all of the tokens in this string until we find the one that 513 // contains the byte we're looking for. 514 unsigned TokNo = 0; 515 while (1) { 516 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 517 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 518 519 // Get the spelling of the string so that we can get the data that makes up 520 // the string literal, not the identifier for the macro it is potentially 521 // expanded through. 522 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 523 524 // Re-lex the token to get its length and original spelling. 525 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 526 bool Invalid = false; 527 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 528 if (Invalid) 529 return StrTokSpellingLoc; 530 531 const char *StrData = Buffer.data()+LocInfo.second; 532 533 // Create a langops struct and enable trigraphs. This is sufficient for 534 // relexing tokens. 535 LangOptions LangOpts; 536 LangOpts.Trigraphs = true; 537 538 // Create a lexer starting at the beginning of this token. 539 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 540 Buffer.end()); 541 Token TheTok; 542 TheLexer.LexFromRawLexer(TheTok); 543 544 // Use the StringLiteralParser to compute the length of the string in bytes. 545 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 546 unsigned TokNumBytes = SLP.GetStringLength(); 547 548 // If the byte is in this token, return the location of the byte. 549 if (ByteNo < TokNumBytes || 550 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 551 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 552 553 // Now that we know the offset of the token in the spelling, use the 554 // preprocessor to get the offset in the original source. 555 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 556 } 557 558 // Move to the next string token. 559 ++TokNo; 560 ByteNo -= TokNumBytes; 561 } 562} 563 564 565 566/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 567/// corresponds to, e.g. "sizeof" or "[pre]++". 568const char *UnaryOperator::getOpcodeStr(Opcode Op) { 569 switch (Op) { 570 default: assert(0 && "Unknown unary operator"); 571 case UO_PostInc: return "++"; 572 case UO_PostDec: return "--"; 573 case UO_PreInc: return "++"; 574 case UO_PreDec: return "--"; 575 case UO_AddrOf: return "&"; 576 case UO_Deref: return "*"; 577 case UO_Plus: return "+"; 578 case UO_Minus: return "-"; 579 case UO_Not: return "~"; 580 case UO_LNot: return "!"; 581 case UO_Real: return "__real"; 582 case UO_Imag: return "__imag"; 583 case UO_Extension: return "__extension__"; 584 } 585} 586 587UnaryOperatorKind 588UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 589 switch (OO) { 590 default: assert(false && "No unary operator for overloaded function"); 591 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 592 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 593 case OO_Amp: return UO_AddrOf; 594 case OO_Star: return UO_Deref; 595 case OO_Plus: return UO_Plus; 596 case OO_Minus: return UO_Minus; 597 case OO_Tilde: return UO_Not; 598 case OO_Exclaim: return UO_LNot; 599 } 600} 601 602OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 603 switch (Opc) { 604 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 605 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 606 case UO_AddrOf: return OO_Amp; 607 case UO_Deref: return OO_Star; 608 case UO_Plus: return OO_Plus; 609 case UO_Minus: return OO_Minus; 610 case UO_Not: return OO_Tilde; 611 case UO_LNot: return OO_Exclaim; 612 default: return OO_None; 613 } 614} 615 616 617//===----------------------------------------------------------------------===// 618// Postfix Operators. 619//===----------------------------------------------------------------------===// 620 621CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 622 unsigned numargs, QualType t, ExprValueKind VK, 623 SourceLocation rparenloc) 624 : Expr(SC, t, VK, OK_Ordinary, 625 fn->isTypeDependent(), 626 fn->isValueDependent(), 627 fn->containsUnexpandedParameterPack()), 628 NumArgs(numargs) { 629 630 SubExprs = new (C) Stmt*[numargs+1]; 631 SubExprs[FN] = fn; 632 for (unsigned i = 0; i != numargs; ++i) { 633 if (args[i]->isTypeDependent()) 634 ExprBits.TypeDependent = true; 635 if (args[i]->isValueDependent()) 636 ExprBits.ValueDependent = true; 637 if (args[i]->containsUnexpandedParameterPack()) 638 ExprBits.ContainsUnexpandedParameterPack = true; 639 640 SubExprs[i+ARGS_START] = args[i]; 641 } 642 643 RParenLoc = rparenloc; 644} 645 646CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 647 QualType t, ExprValueKind VK, SourceLocation rparenloc) 648 : Expr(CallExprClass, t, VK, OK_Ordinary, 649 fn->isTypeDependent(), 650 fn->isValueDependent(), 651 fn->containsUnexpandedParameterPack()), 652 NumArgs(numargs) { 653 654 SubExprs = new (C) Stmt*[numargs+1]; 655 SubExprs[FN] = fn; 656 for (unsigned i = 0; i != numargs; ++i) { 657 if (args[i]->isTypeDependent()) 658 ExprBits.TypeDependent = true; 659 if (args[i]->isValueDependent()) 660 ExprBits.ValueDependent = true; 661 if (args[i]->containsUnexpandedParameterPack()) 662 ExprBits.ContainsUnexpandedParameterPack = true; 663 664 SubExprs[i+ARGS_START] = args[i]; 665 } 666 667 RParenLoc = rparenloc; 668} 669 670CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 671 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 672 // FIXME: Why do we allocate this? 673 SubExprs = new (C) Stmt*[1]; 674} 675 676Decl *CallExpr::getCalleeDecl() { 677 Expr *CEE = getCallee()->IgnoreParenCasts(); 678 // If we're calling a dereference, look at the pointer instead. 679 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 680 if (BO->isPtrMemOp()) 681 CEE = BO->getRHS()->IgnoreParenCasts(); 682 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 683 if (UO->getOpcode() == UO_Deref) 684 CEE = UO->getSubExpr()->IgnoreParenCasts(); 685 } 686 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 687 return DRE->getDecl(); 688 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 689 return ME->getMemberDecl(); 690 691 return 0; 692} 693 694FunctionDecl *CallExpr::getDirectCallee() { 695 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 696} 697 698/// setNumArgs - This changes the number of arguments present in this call. 699/// Any orphaned expressions are deleted by this, and any new operands are set 700/// to null. 701void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 702 // No change, just return. 703 if (NumArgs == getNumArgs()) return; 704 705 // If shrinking # arguments, just delete the extras and forgot them. 706 if (NumArgs < getNumArgs()) { 707 this->NumArgs = NumArgs; 708 return; 709 } 710 711 // Otherwise, we are growing the # arguments. New an bigger argument array. 712 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 713 // Copy over args. 714 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 715 NewSubExprs[i] = SubExprs[i]; 716 // Null out new args. 717 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 718 NewSubExprs[i] = 0; 719 720 if (SubExprs) C.Deallocate(SubExprs); 721 SubExprs = NewSubExprs; 722 this->NumArgs = NumArgs; 723} 724 725/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 726/// not, return 0. 727unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 728 // All simple function calls (e.g. func()) are implicitly cast to pointer to 729 // function. As a result, we try and obtain the DeclRefExpr from the 730 // ImplicitCastExpr. 731 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 732 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 733 return 0; 734 735 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 736 if (!DRE) 737 return 0; 738 739 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 740 if (!FDecl) 741 return 0; 742 743 if (!FDecl->getIdentifier()) 744 return 0; 745 746 return FDecl->getBuiltinID(); 747} 748 749QualType CallExpr::getCallReturnType() const { 750 QualType CalleeType = getCallee()->getType(); 751 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 752 CalleeType = FnTypePtr->getPointeeType(); 753 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 754 CalleeType = BPT->getPointeeType(); 755 else if (const MemberPointerType *MPT 756 = CalleeType->getAs<MemberPointerType>()) 757 CalleeType = MPT->getPointeeType(); 758 759 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 760 return FnType->getResultType(); 761} 762 763OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 764 SourceLocation OperatorLoc, 765 TypeSourceInfo *tsi, 766 OffsetOfNode* compsPtr, unsigned numComps, 767 Expr** exprsPtr, unsigned numExprs, 768 SourceLocation RParenLoc) { 769 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 770 sizeof(OffsetOfNode) * numComps + 771 sizeof(Expr*) * numExprs); 772 773 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 774 exprsPtr, numExprs, RParenLoc); 775} 776 777OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 778 unsigned numComps, unsigned numExprs) { 779 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 780 sizeof(OffsetOfNode) * numComps + 781 sizeof(Expr*) * numExprs); 782 return new (Mem) OffsetOfExpr(numComps, numExprs); 783} 784 785OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 786 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 787 OffsetOfNode* compsPtr, unsigned numComps, 788 Expr** exprsPtr, unsigned numExprs, 789 SourceLocation RParenLoc) 790 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 791 /*TypeDependent=*/false, 792 /*ValueDependent=*/tsi->getType()->isDependentType(), 793 tsi->getType()->containsUnexpandedParameterPack()), 794 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 795 NumComps(numComps), NumExprs(numExprs) 796{ 797 for(unsigned i = 0; i < numComps; ++i) { 798 setComponent(i, compsPtr[i]); 799 } 800 801 for(unsigned i = 0; i < numExprs; ++i) { 802 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 803 ExprBits.ValueDependent = true; 804 if (exprsPtr[i]->containsUnexpandedParameterPack()) 805 ExprBits.ContainsUnexpandedParameterPack = true; 806 807 setIndexExpr(i, exprsPtr[i]); 808 } 809} 810 811IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 812 assert(getKind() == Field || getKind() == Identifier); 813 if (getKind() == Field) 814 return getField()->getIdentifier(); 815 816 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 817} 818 819MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 820 NestedNameSpecifier *qual, 821 SourceRange qualrange, 822 ValueDecl *memberdecl, 823 DeclAccessPair founddecl, 824 DeclarationNameInfo nameinfo, 825 const TemplateArgumentListInfo *targs, 826 QualType ty, 827 ExprValueKind vk, 828 ExprObjectKind ok) { 829 std::size_t Size = sizeof(MemberExpr); 830 831 bool hasQualOrFound = (qual != 0 || 832 founddecl.getDecl() != memberdecl || 833 founddecl.getAccess() != memberdecl->getAccess()); 834 if (hasQualOrFound) 835 Size += sizeof(MemberNameQualifier); 836 837 if (targs) 838 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 839 840 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 841 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 842 ty, vk, ok); 843 844 if (hasQualOrFound) { 845 if (qual && qual->isDependent()) { 846 E->setValueDependent(true); 847 E->setTypeDependent(true); 848 } 849 E->HasQualifierOrFoundDecl = true; 850 851 MemberNameQualifier *NQ = E->getMemberQualifier(); 852 NQ->NNS = qual; 853 NQ->Range = qualrange; 854 NQ->FoundDecl = founddecl; 855 } 856 857 if (targs) { 858 E->HasExplicitTemplateArgumentList = true; 859 E->getExplicitTemplateArgs().initializeFrom(*targs); 860 } 861 862 return E; 863} 864 865const char *CastExpr::getCastKindName() const { 866 switch (getCastKind()) { 867 case CK_Dependent: 868 return "Dependent"; 869 case CK_BitCast: 870 return "BitCast"; 871 case CK_LValueBitCast: 872 return "LValueBitCast"; 873 case CK_LValueToRValue: 874 return "LValueToRValue"; 875 case CK_GetObjCProperty: 876 return "GetObjCProperty"; 877 case CK_NoOp: 878 return "NoOp"; 879 case CK_BaseToDerived: 880 return "BaseToDerived"; 881 case CK_DerivedToBase: 882 return "DerivedToBase"; 883 case CK_UncheckedDerivedToBase: 884 return "UncheckedDerivedToBase"; 885 case CK_Dynamic: 886 return "Dynamic"; 887 case CK_ToUnion: 888 return "ToUnion"; 889 case CK_ArrayToPointerDecay: 890 return "ArrayToPointerDecay"; 891 case CK_FunctionToPointerDecay: 892 return "FunctionToPointerDecay"; 893 case CK_NullToMemberPointer: 894 return "NullToMemberPointer"; 895 case CK_NullToPointer: 896 return "NullToPointer"; 897 case CK_BaseToDerivedMemberPointer: 898 return "BaseToDerivedMemberPointer"; 899 case CK_DerivedToBaseMemberPointer: 900 return "DerivedToBaseMemberPointer"; 901 case CK_UserDefinedConversion: 902 return "UserDefinedConversion"; 903 case CK_ConstructorConversion: 904 return "ConstructorConversion"; 905 case CK_IntegralToPointer: 906 return "IntegralToPointer"; 907 case CK_PointerToIntegral: 908 return "PointerToIntegral"; 909 case CK_PointerToBoolean: 910 return "PointerToBoolean"; 911 case CK_ToVoid: 912 return "ToVoid"; 913 case CK_VectorSplat: 914 return "VectorSplat"; 915 case CK_IntegralCast: 916 return "IntegralCast"; 917 case CK_IntegralToBoolean: 918 return "IntegralToBoolean"; 919 case CK_IntegralToFloating: 920 return "IntegralToFloating"; 921 case CK_FloatingToIntegral: 922 return "FloatingToIntegral"; 923 case CK_FloatingCast: 924 return "FloatingCast"; 925 case CK_FloatingToBoolean: 926 return "FloatingToBoolean"; 927 case CK_MemberPointerToBoolean: 928 return "MemberPointerToBoolean"; 929 case CK_AnyPointerToObjCPointerCast: 930 return "AnyPointerToObjCPointerCast"; 931 case CK_AnyPointerToBlockPointerCast: 932 return "AnyPointerToBlockPointerCast"; 933 case CK_ObjCObjectLValueCast: 934 return "ObjCObjectLValueCast"; 935 case CK_FloatingRealToComplex: 936 return "FloatingRealToComplex"; 937 case CK_FloatingComplexToReal: 938 return "FloatingComplexToReal"; 939 case CK_FloatingComplexToBoolean: 940 return "FloatingComplexToBoolean"; 941 case CK_FloatingComplexCast: 942 return "FloatingComplexCast"; 943 case CK_FloatingComplexToIntegralComplex: 944 return "FloatingComplexToIntegralComplex"; 945 case CK_IntegralRealToComplex: 946 return "IntegralRealToComplex"; 947 case CK_IntegralComplexToReal: 948 return "IntegralComplexToReal"; 949 case CK_IntegralComplexToBoolean: 950 return "IntegralComplexToBoolean"; 951 case CK_IntegralComplexCast: 952 return "IntegralComplexCast"; 953 case CK_IntegralComplexToFloatingComplex: 954 return "IntegralComplexToFloatingComplex"; 955 } 956 957 llvm_unreachable("Unhandled cast kind!"); 958 return 0; 959} 960 961Expr *CastExpr::getSubExprAsWritten() { 962 Expr *SubExpr = 0; 963 CastExpr *E = this; 964 do { 965 SubExpr = E->getSubExpr(); 966 967 // Skip any temporary bindings; they're implicit. 968 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 969 SubExpr = Binder->getSubExpr(); 970 971 // Conversions by constructor and conversion functions have a 972 // subexpression describing the call; strip it off. 973 if (E->getCastKind() == CK_ConstructorConversion) 974 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 975 else if (E->getCastKind() == CK_UserDefinedConversion) 976 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 977 978 // If the subexpression we're left with is an implicit cast, look 979 // through that, too. 980 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 981 982 return SubExpr; 983} 984 985CXXBaseSpecifier **CastExpr::path_buffer() { 986 switch (getStmtClass()) { 987#define ABSTRACT_STMT(x) 988#define CASTEXPR(Type, Base) \ 989 case Stmt::Type##Class: \ 990 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 991#define STMT(Type, Base) 992#include "clang/AST/StmtNodes.inc" 993 default: 994 llvm_unreachable("non-cast expressions not possible here"); 995 return 0; 996 } 997} 998 999void CastExpr::setCastPath(const CXXCastPath &Path) { 1000 assert(Path.size() == path_size()); 1001 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1002} 1003 1004ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1005 CastKind Kind, Expr *Operand, 1006 const CXXCastPath *BasePath, 1007 ExprValueKind VK) { 1008 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1009 void *Buffer = 1010 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1011 ImplicitCastExpr *E = 1012 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1013 if (PathSize) E->setCastPath(*BasePath); 1014 return E; 1015} 1016 1017ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1018 unsigned PathSize) { 1019 void *Buffer = 1020 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1021 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1022} 1023 1024 1025CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1026 ExprValueKind VK, CastKind K, Expr *Op, 1027 const CXXCastPath *BasePath, 1028 TypeSourceInfo *WrittenTy, 1029 SourceLocation L, SourceLocation R) { 1030 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1031 void *Buffer = 1032 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1033 CStyleCastExpr *E = 1034 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1035 if (PathSize) E->setCastPath(*BasePath); 1036 return E; 1037} 1038 1039CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1040 void *Buffer = 1041 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1042 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1043} 1044 1045/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1046/// corresponds to, e.g. "<<=". 1047const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1048 switch (Op) { 1049 case BO_PtrMemD: return ".*"; 1050 case BO_PtrMemI: return "->*"; 1051 case BO_Mul: return "*"; 1052 case BO_Div: return "/"; 1053 case BO_Rem: return "%"; 1054 case BO_Add: return "+"; 1055 case BO_Sub: return "-"; 1056 case BO_Shl: return "<<"; 1057 case BO_Shr: return ">>"; 1058 case BO_LT: return "<"; 1059 case BO_GT: return ">"; 1060 case BO_LE: return "<="; 1061 case BO_GE: return ">="; 1062 case BO_EQ: return "=="; 1063 case BO_NE: return "!="; 1064 case BO_And: return "&"; 1065 case BO_Xor: return "^"; 1066 case BO_Or: return "|"; 1067 case BO_LAnd: return "&&"; 1068 case BO_LOr: return "||"; 1069 case BO_Assign: return "="; 1070 case BO_MulAssign: return "*="; 1071 case BO_DivAssign: return "/="; 1072 case BO_RemAssign: return "%="; 1073 case BO_AddAssign: return "+="; 1074 case BO_SubAssign: return "-="; 1075 case BO_ShlAssign: return "<<="; 1076 case BO_ShrAssign: return ">>="; 1077 case BO_AndAssign: return "&="; 1078 case BO_XorAssign: return "^="; 1079 case BO_OrAssign: return "|="; 1080 case BO_Comma: return ","; 1081 } 1082 1083 return ""; 1084} 1085 1086BinaryOperatorKind 1087BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1088 switch (OO) { 1089 default: assert(false && "Not an overloadable binary operator"); 1090 case OO_Plus: return BO_Add; 1091 case OO_Minus: return BO_Sub; 1092 case OO_Star: return BO_Mul; 1093 case OO_Slash: return BO_Div; 1094 case OO_Percent: return BO_Rem; 1095 case OO_Caret: return BO_Xor; 1096 case OO_Amp: return BO_And; 1097 case OO_Pipe: return BO_Or; 1098 case OO_Equal: return BO_Assign; 1099 case OO_Less: return BO_LT; 1100 case OO_Greater: return BO_GT; 1101 case OO_PlusEqual: return BO_AddAssign; 1102 case OO_MinusEqual: return BO_SubAssign; 1103 case OO_StarEqual: return BO_MulAssign; 1104 case OO_SlashEqual: return BO_DivAssign; 1105 case OO_PercentEqual: return BO_RemAssign; 1106 case OO_CaretEqual: return BO_XorAssign; 1107 case OO_AmpEqual: return BO_AndAssign; 1108 case OO_PipeEqual: return BO_OrAssign; 1109 case OO_LessLess: return BO_Shl; 1110 case OO_GreaterGreater: return BO_Shr; 1111 case OO_LessLessEqual: return BO_ShlAssign; 1112 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1113 case OO_EqualEqual: return BO_EQ; 1114 case OO_ExclaimEqual: return BO_NE; 1115 case OO_LessEqual: return BO_LE; 1116 case OO_GreaterEqual: return BO_GE; 1117 case OO_AmpAmp: return BO_LAnd; 1118 case OO_PipePipe: return BO_LOr; 1119 case OO_Comma: return BO_Comma; 1120 case OO_ArrowStar: return BO_PtrMemI; 1121 } 1122} 1123 1124OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1125 static const OverloadedOperatorKind OverOps[] = { 1126 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1127 OO_Star, OO_Slash, OO_Percent, 1128 OO_Plus, OO_Minus, 1129 OO_LessLess, OO_GreaterGreater, 1130 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1131 OO_EqualEqual, OO_ExclaimEqual, 1132 OO_Amp, 1133 OO_Caret, 1134 OO_Pipe, 1135 OO_AmpAmp, 1136 OO_PipePipe, 1137 OO_Equal, OO_StarEqual, 1138 OO_SlashEqual, OO_PercentEqual, 1139 OO_PlusEqual, OO_MinusEqual, 1140 OO_LessLessEqual, OO_GreaterGreaterEqual, 1141 OO_AmpEqual, OO_CaretEqual, 1142 OO_PipeEqual, 1143 OO_Comma 1144 }; 1145 return OverOps[Opc]; 1146} 1147 1148InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1149 Expr **initExprs, unsigned numInits, 1150 SourceLocation rbraceloc) 1151 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1152 false), 1153 InitExprs(C, numInits), 1154 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1155 UnionFieldInit(0), HadArrayRangeDesignator(false) 1156{ 1157 for (unsigned I = 0; I != numInits; ++I) { 1158 if (initExprs[I]->isTypeDependent()) 1159 ExprBits.TypeDependent = true; 1160 if (initExprs[I]->isValueDependent()) 1161 ExprBits.ValueDependent = true; 1162 if (initExprs[I]->containsUnexpandedParameterPack()) 1163 ExprBits.ContainsUnexpandedParameterPack = true; 1164 } 1165 1166 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1167} 1168 1169void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1170 if (NumInits > InitExprs.size()) 1171 InitExprs.reserve(C, NumInits); 1172} 1173 1174void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1175 InitExprs.resize(C, NumInits, 0); 1176} 1177 1178Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1179 if (Init >= InitExprs.size()) { 1180 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1181 InitExprs.back() = expr; 1182 return 0; 1183 } 1184 1185 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1186 InitExprs[Init] = expr; 1187 return Result; 1188} 1189 1190SourceRange InitListExpr::getSourceRange() const { 1191 if (SyntacticForm) 1192 return SyntacticForm->getSourceRange(); 1193 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1194 if (Beg.isInvalid()) { 1195 // Find the first non-null initializer. 1196 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1197 E = InitExprs.end(); 1198 I != E; ++I) { 1199 if (Stmt *S = *I) { 1200 Beg = S->getLocStart(); 1201 break; 1202 } 1203 } 1204 } 1205 if (End.isInvalid()) { 1206 // Find the first non-null initializer from the end. 1207 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1208 E = InitExprs.rend(); 1209 I != E; ++I) { 1210 if (Stmt *S = *I) { 1211 End = S->getSourceRange().getEnd(); 1212 break; 1213 } 1214 } 1215 } 1216 return SourceRange(Beg, End); 1217} 1218 1219/// getFunctionType - Return the underlying function type for this block. 1220/// 1221const FunctionType *BlockExpr::getFunctionType() const { 1222 return getType()->getAs<BlockPointerType>()-> 1223 getPointeeType()->getAs<FunctionType>(); 1224} 1225 1226SourceLocation BlockExpr::getCaretLocation() const { 1227 return TheBlock->getCaretLocation(); 1228} 1229const Stmt *BlockExpr::getBody() const { 1230 return TheBlock->getBody(); 1231} 1232Stmt *BlockExpr::getBody() { 1233 return TheBlock->getBody(); 1234} 1235 1236 1237//===----------------------------------------------------------------------===// 1238// Generic Expression Routines 1239//===----------------------------------------------------------------------===// 1240 1241/// isUnusedResultAWarning - Return true if this immediate expression should 1242/// be warned about if the result is unused. If so, fill in Loc and Ranges 1243/// with location to warn on and the source range[s] to report with the 1244/// warning. 1245bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1246 SourceRange &R2, ASTContext &Ctx) const { 1247 // Don't warn if the expr is type dependent. The type could end up 1248 // instantiating to void. 1249 if (isTypeDependent()) 1250 return false; 1251 1252 switch (getStmtClass()) { 1253 default: 1254 if (getType()->isVoidType()) 1255 return false; 1256 Loc = getExprLoc(); 1257 R1 = getSourceRange(); 1258 return true; 1259 case ParenExprClass: 1260 return cast<ParenExpr>(this)->getSubExpr()-> 1261 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1262 case UnaryOperatorClass: { 1263 const UnaryOperator *UO = cast<UnaryOperator>(this); 1264 1265 switch (UO->getOpcode()) { 1266 default: break; 1267 case UO_PostInc: 1268 case UO_PostDec: 1269 case UO_PreInc: 1270 case UO_PreDec: // ++/-- 1271 return false; // Not a warning. 1272 case UO_Deref: 1273 // Dereferencing a volatile pointer is a side-effect. 1274 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1275 return false; 1276 break; 1277 case UO_Real: 1278 case UO_Imag: 1279 // accessing a piece of a volatile complex is a side-effect. 1280 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1281 .isVolatileQualified()) 1282 return false; 1283 break; 1284 case UO_Extension: 1285 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1286 } 1287 Loc = UO->getOperatorLoc(); 1288 R1 = UO->getSubExpr()->getSourceRange(); 1289 return true; 1290 } 1291 case BinaryOperatorClass: { 1292 const BinaryOperator *BO = cast<BinaryOperator>(this); 1293 switch (BO->getOpcode()) { 1294 default: 1295 break; 1296 // Consider the RHS of comma for side effects. LHS was checked by 1297 // Sema::CheckCommaOperands. 1298 case BO_Comma: 1299 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1300 // lvalue-ness) of an assignment written in a macro. 1301 if (IntegerLiteral *IE = 1302 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1303 if (IE->getValue() == 0) 1304 return false; 1305 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1306 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1307 case BO_LAnd: 1308 case BO_LOr: 1309 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1310 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1311 return false; 1312 break; 1313 } 1314 if (BO->isAssignmentOp()) 1315 return false; 1316 Loc = BO->getOperatorLoc(); 1317 R1 = BO->getLHS()->getSourceRange(); 1318 R2 = BO->getRHS()->getSourceRange(); 1319 return true; 1320 } 1321 case CompoundAssignOperatorClass: 1322 case VAArgExprClass: 1323 return false; 1324 1325 case ConditionalOperatorClass: { 1326 // The condition must be evaluated, but if either the LHS or RHS is a 1327 // warning, warn about them. 1328 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1329 if (Exp->getLHS() && 1330 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1331 return true; 1332 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1333 } 1334 1335 case MemberExprClass: 1336 // If the base pointer or element is to a volatile pointer/field, accessing 1337 // it is a side effect. 1338 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1339 return false; 1340 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1341 R1 = SourceRange(Loc, Loc); 1342 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1343 return true; 1344 1345 case ArraySubscriptExprClass: 1346 // If the base pointer or element is to a volatile pointer/field, accessing 1347 // it is a side effect. 1348 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1349 return false; 1350 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1351 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1352 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1353 return true; 1354 1355 case CallExprClass: 1356 case CXXOperatorCallExprClass: 1357 case CXXMemberCallExprClass: { 1358 // If this is a direct call, get the callee. 1359 const CallExpr *CE = cast<CallExpr>(this); 1360 if (const Decl *FD = CE->getCalleeDecl()) { 1361 // If the callee has attribute pure, const, or warn_unused_result, warn 1362 // about it. void foo() { strlen("bar"); } should warn. 1363 // 1364 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1365 // updated to match for QoI. 1366 if (FD->getAttr<WarnUnusedResultAttr>() || 1367 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1368 Loc = CE->getCallee()->getLocStart(); 1369 R1 = CE->getCallee()->getSourceRange(); 1370 1371 if (unsigned NumArgs = CE->getNumArgs()) 1372 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1373 CE->getArg(NumArgs-1)->getLocEnd()); 1374 return true; 1375 } 1376 } 1377 return false; 1378 } 1379 1380 case CXXTemporaryObjectExprClass: 1381 case CXXConstructExprClass: 1382 return false; 1383 1384 case ObjCMessageExprClass: { 1385 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1386 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1387 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1388 Loc = getExprLoc(); 1389 return true; 1390 } 1391 return false; 1392 } 1393 1394 case ObjCPropertyRefExprClass: 1395 Loc = getExprLoc(); 1396 R1 = getSourceRange(); 1397 return true; 1398 1399 case StmtExprClass: { 1400 // Statement exprs don't logically have side effects themselves, but are 1401 // sometimes used in macros in ways that give them a type that is unused. 1402 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1403 // however, if the result of the stmt expr is dead, we don't want to emit a 1404 // warning. 1405 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1406 if (!CS->body_empty()) { 1407 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1408 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1409 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1410 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1411 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1412 } 1413 1414 if (getType()->isVoidType()) 1415 return false; 1416 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1417 R1 = getSourceRange(); 1418 return true; 1419 } 1420 case CStyleCastExprClass: 1421 // If this is an explicit cast to void, allow it. People do this when they 1422 // think they know what they're doing :). 1423 if (getType()->isVoidType()) 1424 return false; 1425 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1426 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1427 return true; 1428 case CXXFunctionalCastExprClass: { 1429 if (getType()->isVoidType()) 1430 return false; 1431 const CastExpr *CE = cast<CastExpr>(this); 1432 1433 // If this is a cast to void or a constructor conversion, check the operand. 1434 // Otherwise, the result of the cast is unused. 1435 if (CE->getCastKind() == CK_ToVoid || 1436 CE->getCastKind() == CK_ConstructorConversion) 1437 return (cast<CastExpr>(this)->getSubExpr() 1438 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1439 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1440 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1441 return true; 1442 } 1443 1444 case ImplicitCastExprClass: 1445 // Check the operand, since implicit casts are inserted by Sema 1446 return (cast<ImplicitCastExpr>(this) 1447 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1448 1449 case CXXDefaultArgExprClass: 1450 return (cast<CXXDefaultArgExpr>(this) 1451 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1452 1453 case CXXNewExprClass: 1454 // FIXME: In theory, there might be new expressions that don't have side 1455 // effects (e.g. a placement new with an uninitialized POD). 1456 case CXXDeleteExprClass: 1457 return false; 1458 case CXXBindTemporaryExprClass: 1459 return (cast<CXXBindTemporaryExpr>(this) 1460 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1461 case ExprWithCleanupsClass: 1462 return (cast<ExprWithCleanups>(this) 1463 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1464 } 1465} 1466 1467/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1468/// returns true, if it is; false otherwise. 1469bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1470 switch (getStmtClass()) { 1471 default: 1472 return false; 1473 case ObjCIvarRefExprClass: 1474 return true; 1475 case Expr::UnaryOperatorClass: 1476 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1477 case ParenExprClass: 1478 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1479 case ImplicitCastExprClass: 1480 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1481 case CStyleCastExprClass: 1482 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1483 case DeclRefExprClass: { 1484 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1485 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1486 if (VD->hasGlobalStorage()) 1487 return true; 1488 QualType T = VD->getType(); 1489 // dereferencing to a pointer is always a gc'able candidate, 1490 // unless it is __weak. 1491 return T->isPointerType() && 1492 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1493 } 1494 return false; 1495 } 1496 case MemberExprClass: { 1497 const MemberExpr *M = cast<MemberExpr>(this); 1498 return M->getBase()->isOBJCGCCandidate(Ctx); 1499 } 1500 case ArraySubscriptExprClass: 1501 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1502 } 1503} 1504 1505bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1506 if (isTypeDependent()) 1507 return false; 1508 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1509} 1510 1511static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1512 Expr::CanThrowResult CT2) { 1513 // CanThrowResult constants are ordered so that the maximum is the correct 1514 // merge result. 1515 return CT1 > CT2 ? CT1 : CT2; 1516} 1517 1518static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1519 Expr *E = const_cast<Expr*>(CE); 1520 Expr::CanThrowResult R = Expr::CT_Cannot; 1521 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1522 I != IE && R != Expr::CT_Can; ++I) { 1523 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1524 } 1525 return R; 1526} 1527 1528static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1529 bool NullThrows = true) { 1530 if (!D) 1531 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1532 1533 // See if we can get a function type from the decl somehow. 1534 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1535 if (!VD) // If we have no clue what we're calling, assume the worst. 1536 return Expr::CT_Can; 1537 1538 // As an extension, we assume that __attribute__((nothrow)) functions don't 1539 // throw. 1540 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1541 return Expr::CT_Cannot; 1542 1543 QualType T = VD->getType(); 1544 const FunctionProtoType *FT; 1545 if ((FT = T->getAs<FunctionProtoType>())) { 1546 } else if (const PointerType *PT = T->getAs<PointerType>()) 1547 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1548 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1549 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1550 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1551 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1552 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1553 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1554 1555 if (!FT) 1556 return Expr::CT_Can; 1557 1558 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1559} 1560 1561static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1562 if (DC->isTypeDependent()) 1563 return Expr::CT_Dependent; 1564 1565 if (!DC->getTypeAsWritten()->isReferenceType()) 1566 return Expr::CT_Cannot; 1567 1568 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1569} 1570 1571static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1572 const CXXTypeidExpr *DC) { 1573 if (DC->isTypeOperand()) 1574 return Expr::CT_Cannot; 1575 1576 Expr *Op = DC->getExprOperand(); 1577 if (Op->isTypeDependent()) 1578 return Expr::CT_Dependent; 1579 1580 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1581 if (!RT) 1582 return Expr::CT_Cannot; 1583 1584 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1585 return Expr::CT_Cannot; 1586 1587 if (Op->Classify(C).isPRValue()) 1588 return Expr::CT_Cannot; 1589 1590 return Expr::CT_Can; 1591} 1592 1593Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1594 // C++ [expr.unary.noexcept]p3: 1595 // [Can throw] if in a potentially-evaluated context the expression would 1596 // contain: 1597 switch (getStmtClass()) { 1598 case CXXThrowExprClass: 1599 // - a potentially evaluated throw-expression 1600 return CT_Can; 1601 1602 case CXXDynamicCastExprClass: { 1603 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1604 // where T is a reference type, that requires a run-time check 1605 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1606 if (CT == CT_Can) 1607 return CT; 1608 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1609 } 1610 1611 case CXXTypeidExprClass: 1612 // - a potentially evaluated typeid expression applied to a glvalue 1613 // expression whose type is a polymorphic class type 1614 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1615 1616 // - a potentially evaluated call to a function, member function, function 1617 // pointer, or member function pointer that does not have a non-throwing 1618 // exception-specification 1619 case CallExprClass: 1620 case CXXOperatorCallExprClass: 1621 case CXXMemberCallExprClass: { 1622 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1623 if (CT == CT_Can) 1624 return CT; 1625 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1626 } 1627 1628 case CXXConstructExprClass: 1629 case CXXTemporaryObjectExprClass: { 1630 CanThrowResult CT = CanCalleeThrow( 1631 cast<CXXConstructExpr>(this)->getConstructor()); 1632 if (CT == CT_Can) 1633 return CT; 1634 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1635 } 1636 1637 case CXXNewExprClass: { 1638 CanThrowResult CT = MergeCanThrow( 1639 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1640 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1641 /*NullThrows*/false)); 1642 if (CT == CT_Can) 1643 return CT; 1644 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1645 } 1646 1647 case CXXDeleteExprClass: { 1648 CanThrowResult CT = CanCalleeThrow( 1649 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1650 if (CT == CT_Can) 1651 return CT; 1652 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1653 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1654 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1655 Arg = Cast->getSubExpr(); 1656 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1657 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1658 CanThrowResult CT2 = CanCalleeThrow( 1659 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1660 if (CT2 == CT_Can) 1661 return CT2; 1662 CT = MergeCanThrow(CT, CT2); 1663 } 1664 } 1665 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1666 } 1667 1668 case CXXBindTemporaryExprClass: { 1669 // The bound temporary has to be destroyed again, which might throw. 1670 CanThrowResult CT = CanCalleeThrow( 1671 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1672 if (CT == CT_Can) 1673 return CT; 1674 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1675 } 1676 1677 // ObjC message sends are like function calls, but never have exception 1678 // specs. 1679 case ObjCMessageExprClass: 1680 case ObjCPropertyRefExprClass: 1681 return CT_Can; 1682 1683 // Many other things have subexpressions, so we have to test those. 1684 // Some are simple: 1685 case ParenExprClass: 1686 case MemberExprClass: 1687 case CXXReinterpretCastExprClass: 1688 case CXXConstCastExprClass: 1689 case ConditionalOperatorClass: 1690 case CompoundLiteralExprClass: 1691 case ExtVectorElementExprClass: 1692 case InitListExprClass: 1693 case DesignatedInitExprClass: 1694 case ParenListExprClass: 1695 case VAArgExprClass: 1696 case CXXDefaultArgExprClass: 1697 case ExprWithCleanupsClass: 1698 case ObjCIvarRefExprClass: 1699 case ObjCIsaExprClass: 1700 case ShuffleVectorExprClass: 1701 return CanSubExprsThrow(C, this); 1702 1703 // Some might be dependent for other reasons. 1704 case UnaryOperatorClass: 1705 case ArraySubscriptExprClass: 1706 case ImplicitCastExprClass: 1707 case CStyleCastExprClass: 1708 case CXXStaticCastExprClass: 1709 case CXXFunctionalCastExprClass: 1710 case BinaryOperatorClass: 1711 case CompoundAssignOperatorClass: { 1712 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1713 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1714 } 1715 1716 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1717 case StmtExprClass: 1718 return CT_Can; 1719 1720 case ChooseExprClass: 1721 if (isTypeDependent() || isValueDependent()) 1722 return CT_Dependent; 1723 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1724 1725 // Some expressions are always dependent. 1726 case DependentScopeDeclRefExprClass: 1727 case CXXUnresolvedConstructExprClass: 1728 case CXXDependentScopeMemberExprClass: 1729 return CT_Dependent; 1730 1731 default: 1732 // All other expressions don't have subexpressions, or else they are 1733 // unevaluated. 1734 return CT_Cannot; 1735 } 1736} 1737 1738Expr* Expr::IgnoreParens() { 1739 Expr* E = this; 1740 while (true) { 1741 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1742 E = P->getSubExpr(); 1743 continue; 1744 } 1745 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1746 if (P->getOpcode() == UO_Extension) { 1747 E = P->getSubExpr(); 1748 continue; 1749 } 1750 } 1751 return E; 1752 } 1753} 1754 1755/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1756/// or CastExprs or ImplicitCastExprs, returning their operand. 1757Expr *Expr::IgnoreParenCasts() { 1758 Expr *E = this; 1759 while (true) { 1760 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1761 E = P->getSubExpr(); 1762 continue; 1763 } 1764 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1765 E = P->getSubExpr(); 1766 continue; 1767 } 1768 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1769 if (P->getOpcode() == UO_Extension) { 1770 E = P->getSubExpr(); 1771 continue; 1772 } 1773 } 1774 return E; 1775 } 1776} 1777 1778/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1779/// casts. This is intended purely as a temporary workaround for code 1780/// that hasn't yet been rewritten to do the right thing about those 1781/// casts, and may disappear along with the last internal use. 1782Expr *Expr::IgnoreParenLValueCasts() { 1783 Expr *E = this; 1784 while (true) { 1785 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1786 E = P->getSubExpr(); 1787 continue; 1788 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1789 if (P->getCastKind() == CK_LValueToRValue) { 1790 E = P->getSubExpr(); 1791 continue; 1792 } 1793 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1794 if (P->getOpcode() == UO_Extension) { 1795 E = P->getSubExpr(); 1796 continue; 1797 } 1798 } 1799 break; 1800 } 1801 return E; 1802} 1803 1804Expr *Expr::IgnoreParenImpCasts() { 1805 Expr *E = this; 1806 while (true) { 1807 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1808 E = P->getSubExpr(); 1809 continue; 1810 } 1811 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1812 E = P->getSubExpr(); 1813 continue; 1814 } 1815 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1816 if (P->getOpcode() == UO_Extension) { 1817 E = P->getSubExpr(); 1818 continue; 1819 } 1820 } 1821 return E; 1822 } 1823} 1824 1825/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1826/// value (including ptr->int casts of the same size). Strip off any 1827/// ParenExpr or CastExprs, returning their operand. 1828Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1829 Expr *E = this; 1830 while (true) { 1831 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1832 E = P->getSubExpr(); 1833 continue; 1834 } 1835 1836 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1837 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1838 // ptr<->int casts of the same width. We also ignore all identity casts. 1839 Expr *SE = P->getSubExpr(); 1840 1841 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1842 E = SE; 1843 continue; 1844 } 1845 1846 if ((E->getType()->isPointerType() || 1847 E->getType()->isIntegralType(Ctx)) && 1848 (SE->getType()->isPointerType() || 1849 SE->getType()->isIntegralType(Ctx)) && 1850 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1851 E = SE; 1852 continue; 1853 } 1854 } 1855 1856 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1857 if (P->getOpcode() == UO_Extension) { 1858 E = P->getSubExpr(); 1859 continue; 1860 } 1861 } 1862 1863 return E; 1864 } 1865} 1866 1867bool Expr::isDefaultArgument() const { 1868 const Expr *E = this; 1869 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1870 E = ICE->getSubExprAsWritten(); 1871 1872 return isa<CXXDefaultArgExpr>(E); 1873} 1874 1875/// \brief Skip over any no-op casts and any temporary-binding 1876/// expressions. 1877static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1878 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1879 if (ICE->getCastKind() == CK_NoOp) 1880 E = ICE->getSubExpr(); 1881 else 1882 break; 1883 } 1884 1885 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1886 E = BE->getSubExpr(); 1887 1888 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1889 if (ICE->getCastKind() == CK_NoOp) 1890 E = ICE->getSubExpr(); 1891 else 1892 break; 1893 } 1894 1895 return E->IgnoreParens(); 1896} 1897 1898/// isTemporaryObject - Determines if this expression produces a 1899/// temporary of the given class type. 1900bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1901 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1902 return false; 1903 1904 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1905 1906 // Temporaries are by definition pr-values of class type. 1907 if (!E->Classify(C).isPRValue()) { 1908 // In this context, property reference is a message call and is pr-value. 1909 if (!isa<ObjCPropertyRefExpr>(E)) 1910 return false; 1911 } 1912 1913 // Black-list a few cases which yield pr-values of class type that don't 1914 // refer to temporaries of that type: 1915 1916 // - implicit derived-to-base conversions 1917 if (isa<ImplicitCastExpr>(E)) { 1918 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1919 case CK_DerivedToBase: 1920 case CK_UncheckedDerivedToBase: 1921 return false; 1922 default: 1923 break; 1924 } 1925 } 1926 1927 // - member expressions (all) 1928 if (isa<MemberExpr>(E)) 1929 return false; 1930 1931 return true; 1932} 1933 1934/// hasAnyTypeDependentArguments - Determines if any of the expressions 1935/// in Exprs is type-dependent. 1936bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1937 for (unsigned I = 0; I < NumExprs; ++I) 1938 if (Exprs[I]->isTypeDependent()) 1939 return true; 1940 1941 return false; 1942} 1943 1944/// hasAnyValueDependentArguments - Determines if any of the expressions 1945/// in Exprs is value-dependent. 1946bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1947 for (unsigned I = 0; I < NumExprs; ++I) 1948 if (Exprs[I]->isValueDependent()) 1949 return true; 1950 1951 return false; 1952} 1953 1954bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1955 // This function is attempting whether an expression is an initializer 1956 // which can be evaluated at compile-time. isEvaluatable handles most 1957 // of the cases, but it can't deal with some initializer-specific 1958 // expressions, and it can't deal with aggregates; we deal with those here, 1959 // and fall back to isEvaluatable for the other cases. 1960 1961 // If we ever capture reference-binding directly in the AST, we can 1962 // kill the second parameter. 1963 1964 if (IsForRef) { 1965 EvalResult Result; 1966 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1967 } 1968 1969 switch (getStmtClass()) { 1970 default: break; 1971 case StringLiteralClass: 1972 case ObjCStringLiteralClass: 1973 case ObjCEncodeExprClass: 1974 return true; 1975 case CXXTemporaryObjectExprClass: 1976 case CXXConstructExprClass: { 1977 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 1978 1979 // Only if it's 1980 // 1) an application of the trivial default constructor or 1981 if (!CE->getConstructor()->isTrivial()) return false; 1982 if (!CE->getNumArgs()) return true; 1983 1984 // 2) an elidable trivial copy construction of an operand which is 1985 // itself a constant initializer. Note that we consider the 1986 // operand on its own, *not* as a reference binding. 1987 return CE->isElidable() && 1988 CE->getArg(0)->isConstantInitializer(Ctx, false); 1989 } 1990 case CompoundLiteralExprClass: { 1991 // This handles gcc's extension that allows global initializers like 1992 // "struct x {int x;} x = (struct x) {};". 1993 // FIXME: This accepts other cases it shouldn't! 1994 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1995 return Exp->isConstantInitializer(Ctx, false); 1996 } 1997 case InitListExprClass: { 1998 // FIXME: This doesn't deal with fields with reference types correctly. 1999 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2000 // to bitfields. 2001 const InitListExpr *Exp = cast<InitListExpr>(this); 2002 unsigned numInits = Exp->getNumInits(); 2003 for (unsigned i = 0; i < numInits; i++) { 2004 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2005 return false; 2006 } 2007 return true; 2008 } 2009 case ImplicitValueInitExprClass: 2010 return true; 2011 case ParenExprClass: 2012 return cast<ParenExpr>(this)->getSubExpr() 2013 ->isConstantInitializer(Ctx, IsForRef); 2014 case ChooseExprClass: 2015 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2016 ->isConstantInitializer(Ctx, IsForRef); 2017 case UnaryOperatorClass: { 2018 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2019 if (Exp->getOpcode() == UO_Extension) 2020 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2021 break; 2022 } 2023 case BinaryOperatorClass: { 2024 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2025 // but this handles the common case. 2026 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2027 if (Exp->getOpcode() == BO_Sub && 2028 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2029 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2030 return true; 2031 break; 2032 } 2033 case CXXFunctionalCastExprClass: 2034 case CXXStaticCastExprClass: 2035 case ImplicitCastExprClass: 2036 case CStyleCastExprClass: 2037 // Handle casts with a destination that's a struct or union; this 2038 // deals with both the gcc no-op struct cast extension and the 2039 // cast-to-union extension. 2040 if (getType()->isRecordType()) 2041 return cast<CastExpr>(this)->getSubExpr() 2042 ->isConstantInitializer(Ctx, false); 2043 2044 // Integer->integer casts can be handled here, which is important for 2045 // things like (int)(&&x-&&y). Scary but true. 2046 if (getType()->isIntegerType() && 2047 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2048 return cast<CastExpr>(this)->getSubExpr() 2049 ->isConstantInitializer(Ctx, false); 2050 2051 break; 2052 } 2053 return isEvaluatable(Ctx); 2054} 2055 2056/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2057/// integer constant expression with the value zero, or if this is one that is 2058/// cast to void*. 2059bool Expr::isNullPointerConstant(ASTContext &Ctx, 2060 NullPointerConstantValueDependence NPC) const { 2061 if (isValueDependent()) { 2062 switch (NPC) { 2063 case NPC_NeverValueDependent: 2064 assert(false && "Unexpected value dependent expression!"); 2065 // If the unthinkable happens, fall through to the safest alternative. 2066 2067 case NPC_ValueDependentIsNull: 2068 return isTypeDependent() || getType()->isIntegralType(Ctx); 2069 2070 case NPC_ValueDependentIsNotNull: 2071 return false; 2072 } 2073 } 2074 2075 // Strip off a cast to void*, if it exists. Except in C++. 2076 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2077 if (!Ctx.getLangOptions().CPlusPlus) { 2078 // Check that it is a cast to void*. 2079 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2080 QualType Pointee = PT->getPointeeType(); 2081 if (!Pointee.hasQualifiers() && 2082 Pointee->isVoidType() && // to void* 2083 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2084 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2085 } 2086 } 2087 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2088 // Ignore the ImplicitCastExpr type entirely. 2089 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2090 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2091 // Accept ((void*)0) as a null pointer constant, as many other 2092 // implementations do. 2093 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2094 } else if (const CXXDefaultArgExpr *DefaultArg 2095 = dyn_cast<CXXDefaultArgExpr>(this)) { 2096 // See through default argument expressions 2097 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2098 } else if (isa<GNUNullExpr>(this)) { 2099 // The GNU __null extension is always a null pointer constant. 2100 return true; 2101 } 2102 2103 // C++0x nullptr_t is always a null pointer constant. 2104 if (getType()->isNullPtrType()) 2105 return true; 2106 2107 if (const RecordType *UT = getType()->getAsUnionType()) 2108 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2109 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2110 const Expr *InitExpr = CLE->getInitializer(); 2111 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2112 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2113 } 2114 // This expression must be an integer type. 2115 if (!getType()->isIntegerType() || 2116 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2117 return false; 2118 2119 // If we have an integer constant expression, we need to *evaluate* it and 2120 // test for the value 0. 2121 llvm::APSInt Result; 2122 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2123} 2124 2125/// \brief If this expression is an l-value for an Objective C 2126/// property, find the underlying property reference expression. 2127const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2128 const Expr *E = this; 2129 while (true) { 2130 assert((E->getValueKind() == VK_LValue && 2131 E->getObjectKind() == OK_ObjCProperty) && 2132 "expression is not a property reference"); 2133 E = E->IgnoreParenCasts(); 2134 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2135 if (BO->getOpcode() == BO_Comma) { 2136 E = BO->getRHS(); 2137 continue; 2138 } 2139 } 2140 2141 break; 2142 } 2143 2144 return cast<ObjCPropertyRefExpr>(E); 2145} 2146 2147FieldDecl *Expr::getBitField() { 2148 Expr *E = this->IgnoreParens(); 2149 2150 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2151 if (ICE->getCastKind() == CK_LValueToRValue || 2152 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2153 E = ICE->getSubExpr()->IgnoreParens(); 2154 else 2155 break; 2156 } 2157 2158 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2159 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2160 if (Field->isBitField()) 2161 return Field; 2162 2163 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2164 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2165 if (Field->isBitField()) 2166 return Field; 2167 2168 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2169 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2170 return BinOp->getLHS()->getBitField(); 2171 2172 return 0; 2173} 2174 2175bool Expr::refersToVectorElement() const { 2176 const Expr *E = this->IgnoreParens(); 2177 2178 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2179 if (ICE->getValueKind() != VK_RValue && 2180 ICE->getCastKind() == CK_NoOp) 2181 E = ICE->getSubExpr()->IgnoreParens(); 2182 else 2183 break; 2184 } 2185 2186 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2187 return ASE->getBase()->getType()->isVectorType(); 2188 2189 if (isa<ExtVectorElementExpr>(E)) 2190 return true; 2191 2192 return false; 2193} 2194 2195/// isArrow - Return true if the base expression is a pointer to vector, 2196/// return false if the base expression is a vector. 2197bool ExtVectorElementExpr::isArrow() const { 2198 return getBase()->getType()->isPointerType(); 2199} 2200 2201unsigned ExtVectorElementExpr::getNumElements() const { 2202 if (const VectorType *VT = getType()->getAs<VectorType>()) 2203 return VT->getNumElements(); 2204 return 1; 2205} 2206 2207/// containsDuplicateElements - Return true if any element access is repeated. 2208bool ExtVectorElementExpr::containsDuplicateElements() const { 2209 // FIXME: Refactor this code to an accessor on the AST node which returns the 2210 // "type" of component access, and share with code below and in Sema. 2211 llvm::StringRef Comp = Accessor->getName(); 2212 2213 // Halving swizzles do not contain duplicate elements. 2214 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2215 return false; 2216 2217 // Advance past s-char prefix on hex swizzles. 2218 if (Comp[0] == 's' || Comp[0] == 'S') 2219 Comp = Comp.substr(1); 2220 2221 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2222 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2223 return true; 2224 2225 return false; 2226} 2227 2228/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2229void ExtVectorElementExpr::getEncodedElementAccess( 2230 llvm::SmallVectorImpl<unsigned> &Elts) const { 2231 llvm::StringRef Comp = Accessor->getName(); 2232 if (Comp[0] == 's' || Comp[0] == 'S') 2233 Comp = Comp.substr(1); 2234 2235 bool isHi = Comp == "hi"; 2236 bool isLo = Comp == "lo"; 2237 bool isEven = Comp == "even"; 2238 bool isOdd = Comp == "odd"; 2239 2240 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2241 uint64_t Index; 2242 2243 if (isHi) 2244 Index = e + i; 2245 else if (isLo) 2246 Index = i; 2247 else if (isEven) 2248 Index = 2 * i; 2249 else if (isOdd) 2250 Index = 2 * i + 1; 2251 else 2252 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2253 2254 Elts.push_back(Index); 2255 } 2256} 2257 2258ObjCMessageExpr::ObjCMessageExpr(QualType T, 2259 ExprValueKind VK, 2260 SourceLocation LBracLoc, 2261 SourceLocation SuperLoc, 2262 bool IsInstanceSuper, 2263 QualType SuperType, 2264 Selector Sel, 2265 SourceLocation SelLoc, 2266 ObjCMethodDecl *Method, 2267 Expr **Args, unsigned NumArgs, 2268 SourceLocation RBracLoc) 2269 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2270 /*TypeDependent=*/false, /*ValueDependent=*/false, 2271 /*ContainsUnexpandedParameterPack=*/false), 2272 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2273 HasMethod(Method != 0), SuperLoc(SuperLoc), 2274 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2275 : Sel.getAsOpaquePtr())), 2276 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2277{ 2278 setReceiverPointer(SuperType.getAsOpaquePtr()); 2279 if (NumArgs) 2280 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2281} 2282 2283ObjCMessageExpr::ObjCMessageExpr(QualType T, 2284 ExprValueKind VK, 2285 SourceLocation LBracLoc, 2286 TypeSourceInfo *Receiver, 2287 Selector Sel, 2288 SourceLocation SelLoc, 2289 ObjCMethodDecl *Method, 2290 Expr **Args, unsigned NumArgs, 2291 SourceLocation RBracLoc) 2292 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2293 T->isDependentType(), T->containsUnexpandedParameterPack()), 2294 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2295 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2296 : Sel.getAsOpaquePtr())), 2297 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2298{ 2299 setReceiverPointer(Receiver); 2300 Expr **MyArgs = getArgs(); 2301 for (unsigned I = 0; I != NumArgs; ++I) { 2302 if (Args[I]->isTypeDependent()) 2303 ExprBits.TypeDependent = true; 2304 if (Args[I]->isValueDependent()) 2305 ExprBits.ValueDependent = true; 2306 if (Args[I]->containsUnexpandedParameterPack()) 2307 ExprBits.ContainsUnexpandedParameterPack = true; 2308 2309 MyArgs[I] = Args[I]; 2310 } 2311} 2312 2313ObjCMessageExpr::ObjCMessageExpr(QualType T, 2314 ExprValueKind VK, 2315 SourceLocation LBracLoc, 2316 Expr *Receiver, 2317 Selector Sel, 2318 SourceLocation SelLoc, 2319 ObjCMethodDecl *Method, 2320 Expr **Args, unsigned NumArgs, 2321 SourceLocation RBracLoc) 2322 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2323 Receiver->isTypeDependent(), 2324 Receiver->containsUnexpandedParameterPack()), 2325 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2326 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2327 : Sel.getAsOpaquePtr())), 2328 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2329{ 2330 setReceiverPointer(Receiver); 2331 Expr **MyArgs = getArgs(); 2332 for (unsigned I = 0; I != NumArgs; ++I) { 2333 if (Args[I]->isTypeDependent()) 2334 ExprBits.TypeDependent = true; 2335 if (Args[I]->isValueDependent()) 2336 ExprBits.ValueDependent = true; 2337 if (Args[I]->containsUnexpandedParameterPack()) 2338 ExprBits.ContainsUnexpandedParameterPack = true; 2339 2340 MyArgs[I] = Args[I]; 2341 } 2342} 2343 2344ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2345 ExprValueKind VK, 2346 SourceLocation LBracLoc, 2347 SourceLocation SuperLoc, 2348 bool IsInstanceSuper, 2349 QualType SuperType, 2350 Selector Sel, 2351 SourceLocation SelLoc, 2352 ObjCMethodDecl *Method, 2353 Expr **Args, unsigned NumArgs, 2354 SourceLocation RBracLoc) { 2355 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2356 NumArgs * sizeof(Expr *); 2357 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2358 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2359 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2360 RBracLoc); 2361} 2362 2363ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2364 ExprValueKind VK, 2365 SourceLocation LBracLoc, 2366 TypeSourceInfo *Receiver, 2367 Selector Sel, 2368 SourceLocation SelLoc, 2369 ObjCMethodDecl *Method, 2370 Expr **Args, unsigned NumArgs, 2371 SourceLocation RBracLoc) { 2372 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2373 NumArgs * sizeof(Expr *); 2374 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2375 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2376 Method, Args, NumArgs, RBracLoc); 2377} 2378 2379ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2380 ExprValueKind VK, 2381 SourceLocation LBracLoc, 2382 Expr *Receiver, 2383 Selector Sel, 2384 SourceLocation SelLoc, 2385 ObjCMethodDecl *Method, 2386 Expr **Args, unsigned NumArgs, 2387 SourceLocation RBracLoc) { 2388 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2389 NumArgs * sizeof(Expr *); 2390 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2391 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2392 Method, Args, NumArgs, RBracLoc); 2393} 2394 2395ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2396 unsigned NumArgs) { 2397 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2398 NumArgs * sizeof(Expr *); 2399 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2400 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2401} 2402 2403SourceRange ObjCMessageExpr::getReceiverRange() const { 2404 switch (getReceiverKind()) { 2405 case Instance: 2406 return getInstanceReceiver()->getSourceRange(); 2407 2408 case Class: 2409 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2410 2411 case SuperInstance: 2412 case SuperClass: 2413 return getSuperLoc(); 2414 } 2415 2416 return SourceLocation(); 2417} 2418 2419Selector ObjCMessageExpr::getSelector() const { 2420 if (HasMethod) 2421 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2422 ->getSelector(); 2423 return Selector(SelectorOrMethod); 2424} 2425 2426ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2427 switch (getReceiverKind()) { 2428 case Instance: 2429 if (const ObjCObjectPointerType *Ptr 2430 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2431 return Ptr->getInterfaceDecl(); 2432 break; 2433 2434 case Class: 2435 if (const ObjCObjectType *Ty 2436 = getClassReceiver()->getAs<ObjCObjectType>()) 2437 return Ty->getInterface(); 2438 break; 2439 2440 case SuperInstance: 2441 if (const ObjCObjectPointerType *Ptr 2442 = getSuperType()->getAs<ObjCObjectPointerType>()) 2443 return Ptr->getInterfaceDecl(); 2444 break; 2445 2446 case SuperClass: 2447 if (const ObjCObjectPointerType *Iface 2448 = getSuperType()->getAs<ObjCObjectPointerType>()) 2449 return Iface->getInterfaceDecl(); 2450 break; 2451 } 2452 2453 return 0; 2454} 2455 2456bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2457 return getCond()->EvaluateAsInt(C) != 0; 2458} 2459 2460ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2461 QualType Type, SourceLocation BLoc, 2462 SourceLocation RP) 2463 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2464 Type->isDependentType(), Type->isDependentType(), 2465 Type->containsUnexpandedParameterPack()), 2466 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2467{ 2468 SubExprs = new (C) Stmt*[nexpr]; 2469 for (unsigned i = 0; i < nexpr; i++) { 2470 if (args[i]->isTypeDependent()) 2471 ExprBits.TypeDependent = true; 2472 if (args[i]->isValueDependent()) 2473 ExprBits.ValueDependent = true; 2474 if (args[i]->containsUnexpandedParameterPack()) 2475 ExprBits.ContainsUnexpandedParameterPack = true; 2476 2477 SubExprs[i] = args[i]; 2478 } 2479} 2480 2481void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2482 unsigned NumExprs) { 2483 if (SubExprs) C.Deallocate(SubExprs); 2484 2485 SubExprs = new (C) Stmt* [NumExprs]; 2486 this->NumExprs = NumExprs; 2487 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2488} 2489 2490//===----------------------------------------------------------------------===// 2491// DesignatedInitExpr 2492//===----------------------------------------------------------------------===// 2493 2494IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2495 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2496 if (Field.NameOrField & 0x01) 2497 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2498 else 2499 return getField()->getIdentifier(); 2500} 2501 2502DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2503 unsigned NumDesignators, 2504 const Designator *Designators, 2505 SourceLocation EqualOrColonLoc, 2506 bool GNUSyntax, 2507 Expr **IndexExprs, 2508 unsigned NumIndexExprs, 2509 Expr *Init) 2510 : Expr(DesignatedInitExprClass, Ty, 2511 Init->getValueKind(), Init->getObjectKind(), 2512 Init->isTypeDependent(), Init->isValueDependent(), 2513 Init->containsUnexpandedParameterPack()), 2514 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2515 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2516 this->Designators = new (C) Designator[NumDesignators]; 2517 2518 // Record the initializer itself. 2519 child_iterator Child = child_begin(); 2520 *Child++ = Init; 2521 2522 // Copy the designators and their subexpressions, computing 2523 // value-dependence along the way. 2524 unsigned IndexIdx = 0; 2525 for (unsigned I = 0; I != NumDesignators; ++I) { 2526 this->Designators[I] = Designators[I]; 2527 2528 if (this->Designators[I].isArrayDesignator()) { 2529 // Compute type- and value-dependence. 2530 Expr *Index = IndexExprs[IndexIdx]; 2531 if (Index->isTypeDependent() || Index->isValueDependent()) 2532 ExprBits.ValueDependent = true; 2533 2534 // Propagate unexpanded parameter packs. 2535 if (Index->containsUnexpandedParameterPack()) 2536 ExprBits.ContainsUnexpandedParameterPack = true; 2537 2538 // Copy the index expressions into permanent storage. 2539 *Child++ = IndexExprs[IndexIdx++]; 2540 } else if (this->Designators[I].isArrayRangeDesignator()) { 2541 // Compute type- and value-dependence. 2542 Expr *Start = IndexExprs[IndexIdx]; 2543 Expr *End = IndexExprs[IndexIdx + 1]; 2544 if (Start->isTypeDependent() || Start->isValueDependent() || 2545 End->isTypeDependent() || End->isValueDependent()) 2546 ExprBits.ValueDependent = true; 2547 2548 // Propagate unexpanded parameter packs. 2549 if (Start->containsUnexpandedParameterPack() || 2550 End->containsUnexpandedParameterPack()) 2551 ExprBits.ContainsUnexpandedParameterPack = true; 2552 2553 // Copy the start/end expressions into permanent storage. 2554 *Child++ = IndexExprs[IndexIdx++]; 2555 *Child++ = IndexExprs[IndexIdx++]; 2556 } 2557 } 2558 2559 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2560} 2561 2562DesignatedInitExpr * 2563DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2564 unsigned NumDesignators, 2565 Expr **IndexExprs, unsigned NumIndexExprs, 2566 SourceLocation ColonOrEqualLoc, 2567 bool UsesColonSyntax, Expr *Init) { 2568 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2569 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2570 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2571 ColonOrEqualLoc, UsesColonSyntax, 2572 IndexExprs, NumIndexExprs, Init); 2573} 2574 2575DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2576 unsigned NumIndexExprs) { 2577 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2578 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2579 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2580} 2581 2582void DesignatedInitExpr::setDesignators(ASTContext &C, 2583 const Designator *Desigs, 2584 unsigned NumDesigs) { 2585 Designators = new (C) Designator[NumDesigs]; 2586 NumDesignators = NumDesigs; 2587 for (unsigned I = 0; I != NumDesigs; ++I) 2588 Designators[I] = Desigs[I]; 2589} 2590 2591SourceRange DesignatedInitExpr::getSourceRange() const { 2592 SourceLocation StartLoc; 2593 Designator &First = 2594 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2595 if (First.isFieldDesignator()) { 2596 if (GNUSyntax) 2597 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2598 else 2599 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2600 } else 2601 StartLoc = 2602 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2603 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2604} 2605 2606Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2607 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2608 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2609 Ptr += sizeof(DesignatedInitExpr); 2610 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2611 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2612} 2613 2614Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2615 assert(D.Kind == Designator::ArrayRangeDesignator && 2616 "Requires array range designator"); 2617 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2618 Ptr += sizeof(DesignatedInitExpr); 2619 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2620 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2621} 2622 2623Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2624 assert(D.Kind == Designator::ArrayRangeDesignator && 2625 "Requires array range designator"); 2626 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2627 Ptr += sizeof(DesignatedInitExpr); 2628 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2629 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2630} 2631 2632/// \brief Replaces the designator at index @p Idx with the series 2633/// of designators in [First, Last). 2634void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2635 const Designator *First, 2636 const Designator *Last) { 2637 unsigned NumNewDesignators = Last - First; 2638 if (NumNewDesignators == 0) { 2639 std::copy_backward(Designators + Idx + 1, 2640 Designators + NumDesignators, 2641 Designators + Idx); 2642 --NumNewDesignators; 2643 return; 2644 } else if (NumNewDesignators == 1) { 2645 Designators[Idx] = *First; 2646 return; 2647 } 2648 2649 Designator *NewDesignators 2650 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2651 std::copy(Designators, Designators + Idx, NewDesignators); 2652 std::copy(First, Last, NewDesignators + Idx); 2653 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2654 NewDesignators + Idx + NumNewDesignators); 2655 Designators = NewDesignators; 2656 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2657} 2658 2659ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2660 Expr **exprs, unsigned nexprs, 2661 SourceLocation rparenloc) 2662 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2663 false, false, false), 2664 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2665 2666 Exprs = new (C) Stmt*[nexprs]; 2667 for (unsigned i = 0; i != nexprs; ++i) { 2668 if (exprs[i]->isTypeDependent()) 2669 ExprBits.TypeDependent = true; 2670 if (exprs[i]->isValueDependent()) 2671 ExprBits.ValueDependent = true; 2672 if (exprs[i]->containsUnexpandedParameterPack()) 2673 ExprBits.ContainsUnexpandedParameterPack = true; 2674 2675 Exprs[i] = exprs[i]; 2676 } 2677} 2678 2679//===----------------------------------------------------------------------===// 2680// ExprIterator. 2681//===----------------------------------------------------------------------===// 2682 2683Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2684Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2685Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2686const Expr* ConstExprIterator::operator[](size_t idx) const { 2687 return cast<Expr>(I[idx]); 2688} 2689const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2690const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2691 2692//===----------------------------------------------------------------------===// 2693// Child Iterators for iterating over subexpressions/substatements 2694//===----------------------------------------------------------------------===// 2695 2696// DeclRefExpr 2697Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2698Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2699 2700// ObjCIvarRefExpr 2701Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2702Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2703 2704// ObjCPropertyRefExpr 2705Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2706{ 2707 if (Receiver.is<Stmt*>()) { 2708 // Hack alert! 2709 return reinterpret_cast<Stmt**> (&Receiver); 2710 } 2711 return child_iterator(); 2712} 2713 2714Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2715{ return Receiver.is<Stmt*>() ? 2716 reinterpret_cast<Stmt**> (&Receiver)+1 : 2717 child_iterator(); 2718} 2719 2720// ObjCIsaExpr 2721Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2722Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2723 2724// PredefinedExpr 2725Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2726Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2727 2728// IntegerLiteral 2729Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2730Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2731 2732// CharacterLiteral 2733Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2734Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2735 2736// FloatingLiteral 2737Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2738Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2739 2740// ImaginaryLiteral 2741Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2742Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2743 2744// StringLiteral 2745Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2746Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2747 2748// ParenExpr 2749Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2750Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2751 2752// UnaryOperator 2753Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2754Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2755 2756// OffsetOfExpr 2757Stmt::child_iterator OffsetOfExpr::child_begin() { 2758 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2759 + NumComps); 2760} 2761Stmt::child_iterator OffsetOfExpr::child_end() { 2762 return child_iterator(&*child_begin() + NumExprs); 2763} 2764 2765// SizeOfAlignOfExpr 2766Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2767 // If this is of a type and the type is a VLA type (and not a typedef), the 2768 // size expression of the VLA needs to be treated as an executable expression. 2769 // Why isn't this weirdness documented better in StmtIterator? 2770 if (isArgumentType()) { 2771 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2772 getArgumentType().getTypePtr())) 2773 return child_iterator(T); 2774 return child_iterator(); 2775 } 2776 return child_iterator(&Argument.Ex); 2777} 2778Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2779 if (isArgumentType()) 2780 return child_iterator(); 2781 return child_iterator(&Argument.Ex + 1); 2782} 2783 2784// ArraySubscriptExpr 2785Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2786 return &SubExprs[0]; 2787} 2788Stmt::child_iterator ArraySubscriptExpr::child_end() { 2789 return &SubExprs[0]+END_EXPR; 2790} 2791 2792// CallExpr 2793Stmt::child_iterator CallExpr::child_begin() { 2794 return &SubExprs[0]; 2795} 2796Stmt::child_iterator CallExpr::child_end() { 2797 return &SubExprs[0]+NumArgs+ARGS_START; 2798} 2799 2800// MemberExpr 2801Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2802Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2803 2804// ExtVectorElementExpr 2805Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2806Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2807 2808// CompoundLiteralExpr 2809Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2810Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2811 2812// CastExpr 2813Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2814Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2815 2816// BinaryOperator 2817Stmt::child_iterator BinaryOperator::child_begin() { 2818 return &SubExprs[0]; 2819} 2820Stmt::child_iterator BinaryOperator::child_end() { 2821 return &SubExprs[0]+END_EXPR; 2822} 2823 2824// ConditionalOperator 2825Stmt::child_iterator ConditionalOperator::child_begin() { 2826 return &SubExprs[0]; 2827} 2828Stmt::child_iterator ConditionalOperator::child_end() { 2829 return &SubExprs[0]+END_EXPR; 2830} 2831 2832// AddrLabelExpr 2833Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2834Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2835 2836// StmtExpr 2837Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2838Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2839 2840 2841// ChooseExpr 2842Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2843Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2844 2845// GNUNullExpr 2846Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2847Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2848 2849// ShuffleVectorExpr 2850Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2851 return &SubExprs[0]; 2852} 2853Stmt::child_iterator ShuffleVectorExpr::child_end() { 2854 return &SubExprs[0]+NumExprs; 2855} 2856 2857// VAArgExpr 2858Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2859Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2860 2861// InitListExpr 2862Stmt::child_iterator InitListExpr::child_begin() { 2863 return InitExprs.size() ? &InitExprs[0] : 0; 2864} 2865Stmt::child_iterator InitListExpr::child_end() { 2866 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2867} 2868 2869// DesignatedInitExpr 2870Stmt::child_iterator DesignatedInitExpr::child_begin() { 2871 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2872 Ptr += sizeof(DesignatedInitExpr); 2873 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2874} 2875Stmt::child_iterator DesignatedInitExpr::child_end() { 2876 return child_iterator(&*child_begin() + NumSubExprs); 2877} 2878 2879// ImplicitValueInitExpr 2880Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2881 return child_iterator(); 2882} 2883 2884Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2885 return child_iterator(); 2886} 2887 2888// ParenListExpr 2889Stmt::child_iterator ParenListExpr::child_begin() { 2890 return &Exprs[0]; 2891} 2892Stmt::child_iterator ParenListExpr::child_end() { 2893 return &Exprs[0]+NumExprs; 2894} 2895 2896// ObjCStringLiteral 2897Stmt::child_iterator ObjCStringLiteral::child_begin() { 2898 return &String; 2899} 2900Stmt::child_iterator ObjCStringLiteral::child_end() { 2901 return &String+1; 2902} 2903 2904// ObjCEncodeExpr 2905Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2906Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2907 2908// ObjCSelectorExpr 2909Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2910 return child_iterator(); 2911} 2912Stmt::child_iterator ObjCSelectorExpr::child_end() { 2913 return child_iterator(); 2914} 2915 2916// ObjCProtocolExpr 2917Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2918 return child_iterator(); 2919} 2920Stmt::child_iterator ObjCProtocolExpr::child_end() { 2921 return child_iterator(); 2922} 2923 2924// ObjCMessageExpr 2925Stmt::child_iterator ObjCMessageExpr::child_begin() { 2926 if (getReceiverKind() == Instance) 2927 return reinterpret_cast<Stmt **>(this + 1); 2928 return reinterpret_cast<Stmt **>(getArgs()); 2929} 2930Stmt::child_iterator ObjCMessageExpr::child_end() { 2931 return reinterpret_cast<Stmt **>(getArgs() + getNumArgs()); 2932} 2933 2934// Blocks 2935Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2936Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2937 2938Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2939Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2940 2941// OpaqueValueExpr 2942SourceRange OpaqueValueExpr::getSourceRange() const { return SourceRange(); } 2943Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } 2944Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); } 2945 2946