Expr.cpp revision aa165f8458b51c546bebff947343e1a36f3594cb
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 (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) { 215 if (NTTP->isParameterPack()) 216 ExprBits.ContainsUnexpandedParameterPack = true; 217 } 218 // FIXME: Variadic templates function parameter packs. 219} 220 221DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 222 SourceRange QualifierRange, 223 ValueDecl *D, SourceLocation NameLoc, 224 const TemplateArgumentListInfo *TemplateArgs, 225 QualType T, ExprValueKind VK) 226 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 227 DecoratedD(D, 228 (Qualifier? HasQualifierFlag : 0) | 229 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 230 Loc(NameLoc) { 231 if (Qualifier) { 232 NameQualifier *NQ = getNameQualifier(); 233 NQ->NNS = Qualifier; 234 NQ->Range = QualifierRange; 235 } 236 237 if (TemplateArgs) 238 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 239 240 computeDependence(); 241} 242 243DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 244 SourceRange QualifierRange, 245 ValueDecl *D, const DeclarationNameInfo &NameInfo, 246 const TemplateArgumentListInfo *TemplateArgs, 247 QualType T, ExprValueKind VK) 248 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 249 DecoratedD(D, 250 (Qualifier? HasQualifierFlag : 0) | 251 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 252 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 253 if (Qualifier) { 254 NameQualifier *NQ = getNameQualifier(); 255 NQ->NNS = Qualifier; 256 NQ->Range = QualifierRange; 257 } 258 259 if (TemplateArgs) 260 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 261 262 computeDependence(); 263} 264 265DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 266 NestedNameSpecifier *Qualifier, 267 SourceRange QualifierRange, 268 ValueDecl *D, 269 SourceLocation NameLoc, 270 QualType T, 271 ExprValueKind VK, 272 const TemplateArgumentListInfo *TemplateArgs) { 273 return Create(Context, Qualifier, QualifierRange, D, 274 DeclarationNameInfo(D->getDeclName(), NameLoc), 275 T, VK, TemplateArgs); 276} 277 278DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 279 NestedNameSpecifier *Qualifier, 280 SourceRange QualifierRange, 281 ValueDecl *D, 282 const DeclarationNameInfo &NameInfo, 283 QualType T, 284 ExprValueKind VK, 285 const TemplateArgumentListInfo *TemplateArgs) { 286 std::size_t Size = sizeof(DeclRefExpr); 287 if (Qualifier != 0) 288 Size += sizeof(NameQualifier); 289 290 if (TemplateArgs) 291 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 292 293 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 294 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 295 TemplateArgs, T, VK); 296} 297 298DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, bool HasQualifier, 299 unsigned NumTemplateArgs) { 300 std::size_t Size = sizeof(DeclRefExpr); 301 if (HasQualifier) 302 Size += sizeof(NameQualifier); 303 304 if (NumTemplateArgs) 305 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 306 307 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 308 return new (Mem) DeclRefExpr(EmptyShell()); 309} 310 311SourceRange DeclRefExpr::getSourceRange() const { 312 SourceRange R = getNameInfo().getSourceRange(); 313 if (hasQualifier()) 314 R.setBegin(getQualifierRange().getBegin()); 315 if (hasExplicitTemplateArgs()) 316 R.setEnd(getRAngleLoc()); 317 return R; 318} 319 320// FIXME: Maybe this should use DeclPrinter with a special "print predefined 321// expr" policy instead. 322std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 323 ASTContext &Context = CurrentDecl->getASTContext(); 324 325 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 326 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 327 return FD->getNameAsString(); 328 329 llvm::SmallString<256> Name; 330 llvm::raw_svector_ostream Out(Name); 331 332 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 333 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 334 Out << "virtual "; 335 if (MD->isStatic()) 336 Out << "static "; 337 } 338 339 PrintingPolicy Policy(Context.getLangOptions()); 340 341 std::string Proto = FD->getQualifiedNameAsString(Policy); 342 343 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 344 const FunctionProtoType *FT = 0; 345 if (FD->hasWrittenPrototype()) 346 FT = dyn_cast<FunctionProtoType>(AFT); 347 348 Proto += "("; 349 if (FT) { 350 llvm::raw_string_ostream POut(Proto); 351 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 352 if (i) POut << ", "; 353 std::string Param; 354 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 355 POut << Param; 356 } 357 358 if (FT->isVariadic()) { 359 if (FD->getNumParams()) POut << ", "; 360 POut << "..."; 361 } 362 } 363 Proto += ")"; 364 365 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 366 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 367 if (ThisQuals.hasConst()) 368 Proto += " const"; 369 if (ThisQuals.hasVolatile()) 370 Proto += " volatile"; 371 } 372 373 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 374 AFT->getResultType().getAsStringInternal(Proto, Policy); 375 376 Out << Proto; 377 378 Out.flush(); 379 return Name.str().str(); 380 } 381 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 382 llvm::SmallString<256> Name; 383 llvm::raw_svector_ostream Out(Name); 384 Out << (MD->isInstanceMethod() ? '-' : '+'); 385 Out << '['; 386 387 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 388 // a null check to avoid a crash. 389 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 390 Out << ID; 391 392 if (const ObjCCategoryImplDecl *CID = 393 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 394 Out << '(' << CID << ')'; 395 396 Out << ' '; 397 Out << MD->getSelector().getAsString(); 398 Out << ']'; 399 400 Out.flush(); 401 return Name.str().str(); 402 } 403 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 404 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 405 return "top level"; 406 } 407 return ""; 408} 409 410void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 411 if (hasAllocation()) 412 C.Deallocate(pVal); 413 414 BitWidth = Val.getBitWidth(); 415 unsigned NumWords = Val.getNumWords(); 416 const uint64_t* Words = Val.getRawData(); 417 if (NumWords > 1) { 418 pVal = new (C) uint64_t[NumWords]; 419 std::copy(Words, Words + NumWords, pVal); 420 } else if (NumWords == 1) 421 VAL = Words[0]; 422 else 423 VAL = 0; 424} 425 426IntegerLiteral * 427IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 428 QualType type, SourceLocation l) { 429 return new (C) IntegerLiteral(C, V, type, l); 430} 431 432IntegerLiteral * 433IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 434 return new (C) IntegerLiteral(Empty); 435} 436 437FloatingLiteral * 438FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 439 bool isexact, QualType Type, SourceLocation L) { 440 return new (C) FloatingLiteral(C, V, isexact, Type, L); 441} 442 443FloatingLiteral * 444FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 445 return new (C) FloatingLiteral(Empty); 446} 447 448/// getValueAsApproximateDouble - This returns the value as an inaccurate 449/// double. Note that this may cause loss of precision, but is useful for 450/// debugging dumps, etc. 451double FloatingLiteral::getValueAsApproximateDouble() const { 452 llvm::APFloat V = getValue(); 453 bool ignored; 454 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 455 &ignored); 456 return V.convertToDouble(); 457} 458 459StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 460 unsigned ByteLength, bool Wide, 461 QualType Ty, 462 const SourceLocation *Loc, 463 unsigned NumStrs) { 464 // Allocate enough space for the StringLiteral plus an array of locations for 465 // any concatenated string tokens. 466 void *Mem = C.Allocate(sizeof(StringLiteral)+ 467 sizeof(SourceLocation)*(NumStrs-1), 468 llvm::alignOf<StringLiteral>()); 469 StringLiteral *SL = new (Mem) StringLiteral(Ty); 470 471 // OPTIMIZE: could allocate this appended to the StringLiteral. 472 char *AStrData = new (C, 1) char[ByteLength]; 473 memcpy(AStrData, StrData, ByteLength); 474 SL->StrData = AStrData; 475 SL->ByteLength = ByteLength; 476 SL->IsWide = Wide; 477 SL->TokLocs[0] = Loc[0]; 478 SL->NumConcatenated = NumStrs; 479 480 if (NumStrs != 1) 481 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 482 return SL; 483} 484 485StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 486 void *Mem = C.Allocate(sizeof(StringLiteral)+ 487 sizeof(SourceLocation)*(NumStrs-1), 488 llvm::alignOf<StringLiteral>()); 489 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 490 SL->StrData = 0; 491 SL->ByteLength = 0; 492 SL->NumConcatenated = NumStrs; 493 return SL; 494} 495 496void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 497 char *AStrData = new (C, 1) char[Str.size()]; 498 memcpy(AStrData, Str.data(), Str.size()); 499 StrData = AStrData; 500 ByteLength = Str.size(); 501} 502 503/// getLocationOfByte - Return a source location that points to the specified 504/// byte of this string literal. 505/// 506/// Strings are amazingly complex. They can be formed from multiple tokens and 507/// can have escape sequences in them in addition to the usual trigraph and 508/// escaped newline business. This routine handles this complexity. 509/// 510SourceLocation StringLiteral:: 511getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 512 const LangOptions &Features, const TargetInfo &Target) const { 513 assert(!isWide() && "This doesn't work for wide strings yet"); 514 515 // Loop over all of the tokens in this string until we find the one that 516 // contains the byte we're looking for. 517 unsigned TokNo = 0; 518 while (1) { 519 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 520 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 521 522 // Get the spelling of the string so that we can get the data that makes up 523 // the string literal, not the identifier for the macro it is potentially 524 // expanded through. 525 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 526 527 // Re-lex the token to get its length and original spelling. 528 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 529 bool Invalid = false; 530 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 531 if (Invalid) 532 return StrTokSpellingLoc; 533 534 const char *StrData = Buffer.data()+LocInfo.second; 535 536 // Create a langops struct and enable trigraphs. This is sufficient for 537 // relexing tokens. 538 LangOptions LangOpts; 539 LangOpts.Trigraphs = true; 540 541 // Create a lexer starting at the beginning of this token. 542 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 543 Buffer.end()); 544 Token TheTok; 545 TheLexer.LexFromRawLexer(TheTok); 546 547 // Use the StringLiteralParser to compute the length of the string in bytes. 548 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 549 unsigned TokNumBytes = SLP.GetStringLength(); 550 551 // If the byte is in this token, return the location of the byte. 552 if (ByteNo < TokNumBytes || 553 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 554 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 555 556 // Now that we know the offset of the token in the spelling, use the 557 // preprocessor to get the offset in the original source. 558 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 559 } 560 561 // Move to the next string token. 562 ++TokNo; 563 ByteNo -= TokNumBytes; 564 } 565} 566 567 568 569/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 570/// corresponds to, e.g. "sizeof" or "[pre]++". 571const char *UnaryOperator::getOpcodeStr(Opcode Op) { 572 switch (Op) { 573 default: assert(0 && "Unknown unary operator"); 574 case UO_PostInc: return "++"; 575 case UO_PostDec: return "--"; 576 case UO_PreInc: return "++"; 577 case UO_PreDec: return "--"; 578 case UO_AddrOf: return "&"; 579 case UO_Deref: return "*"; 580 case UO_Plus: return "+"; 581 case UO_Minus: return "-"; 582 case UO_Not: return "~"; 583 case UO_LNot: return "!"; 584 case UO_Real: return "__real"; 585 case UO_Imag: return "__imag"; 586 case UO_Extension: return "__extension__"; 587 } 588} 589 590UnaryOperatorKind 591UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 592 switch (OO) { 593 default: assert(false && "No unary operator for overloaded function"); 594 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 595 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 596 case OO_Amp: return UO_AddrOf; 597 case OO_Star: return UO_Deref; 598 case OO_Plus: return UO_Plus; 599 case OO_Minus: return UO_Minus; 600 case OO_Tilde: return UO_Not; 601 case OO_Exclaim: return UO_LNot; 602 } 603} 604 605OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 606 switch (Opc) { 607 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 608 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 609 case UO_AddrOf: return OO_Amp; 610 case UO_Deref: return OO_Star; 611 case UO_Plus: return OO_Plus; 612 case UO_Minus: return OO_Minus; 613 case UO_Not: return OO_Tilde; 614 case UO_LNot: return OO_Exclaim; 615 default: return OO_None; 616 } 617} 618 619 620//===----------------------------------------------------------------------===// 621// Postfix Operators. 622//===----------------------------------------------------------------------===// 623 624CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 625 unsigned numargs, QualType t, ExprValueKind VK, 626 SourceLocation rparenloc) 627 : Expr(SC, t, VK, OK_Ordinary, 628 fn->isTypeDependent(), 629 fn->isValueDependent(), 630 fn->containsUnexpandedParameterPack()), 631 NumArgs(numargs) { 632 633 SubExprs = new (C) Stmt*[numargs+1]; 634 SubExprs[FN] = fn; 635 for (unsigned i = 0; i != numargs; ++i) { 636 if (args[i]->isTypeDependent()) 637 ExprBits.TypeDependent = true; 638 if (args[i]->isValueDependent()) 639 ExprBits.ValueDependent = true; 640 if (args[i]->containsUnexpandedParameterPack()) 641 ExprBits.ContainsUnexpandedParameterPack = true; 642 643 SubExprs[i+ARGS_START] = args[i]; 644 } 645 646 RParenLoc = rparenloc; 647} 648 649CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 650 QualType t, ExprValueKind VK, SourceLocation rparenloc) 651 : Expr(CallExprClass, t, VK, OK_Ordinary, 652 fn->isTypeDependent(), 653 fn->isValueDependent(), 654 fn->containsUnexpandedParameterPack()), 655 NumArgs(numargs) { 656 657 SubExprs = new (C) Stmt*[numargs+1]; 658 SubExprs[FN] = fn; 659 for (unsigned i = 0; i != numargs; ++i) { 660 if (args[i]->isTypeDependent()) 661 ExprBits.TypeDependent = true; 662 if (args[i]->isValueDependent()) 663 ExprBits.ValueDependent = true; 664 if (args[i]->containsUnexpandedParameterPack()) 665 ExprBits.ContainsUnexpandedParameterPack = true; 666 667 SubExprs[i+ARGS_START] = args[i]; 668 } 669 670 RParenLoc = rparenloc; 671} 672 673CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 674 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 675 // FIXME: Why do we allocate this? 676 SubExprs = new (C) Stmt*[1]; 677} 678 679Decl *CallExpr::getCalleeDecl() { 680 Expr *CEE = getCallee()->IgnoreParenCasts(); 681 // If we're calling a dereference, look at the pointer instead. 682 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 683 if (BO->isPtrMemOp()) 684 CEE = BO->getRHS()->IgnoreParenCasts(); 685 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 686 if (UO->getOpcode() == UO_Deref) 687 CEE = UO->getSubExpr()->IgnoreParenCasts(); 688 } 689 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 690 return DRE->getDecl(); 691 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 692 return ME->getMemberDecl(); 693 694 return 0; 695} 696 697FunctionDecl *CallExpr::getDirectCallee() { 698 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 699} 700 701/// setNumArgs - This changes the number of arguments present in this call. 702/// Any orphaned expressions are deleted by this, and any new operands are set 703/// to null. 704void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 705 // No change, just return. 706 if (NumArgs == getNumArgs()) return; 707 708 // If shrinking # arguments, just delete the extras and forgot them. 709 if (NumArgs < getNumArgs()) { 710 this->NumArgs = NumArgs; 711 return; 712 } 713 714 // Otherwise, we are growing the # arguments. New an bigger argument array. 715 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 716 // Copy over args. 717 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 718 NewSubExprs[i] = SubExprs[i]; 719 // Null out new args. 720 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 721 NewSubExprs[i] = 0; 722 723 if (SubExprs) C.Deallocate(SubExprs); 724 SubExprs = NewSubExprs; 725 this->NumArgs = NumArgs; 726} 727 728/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 729/// not, return 0. 730unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 731 // All simple function calls (e.g. func()) are implicitly cast to pointer to 732 // function. As a result, we try and obtain the DeclRefExpr from the 733 // ImplicitCastExpr. 734 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 735 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 736 return 0; 737 738 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 739 if (!DRE) 740 return 0; 741 742 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 743 if (!FDecl) 744 return 0; 745 746 if (!FDecl->getIdentifier()) 747 return 0; 748 749 return FDecl->getBuiltinID(); 750} 751 752QualType CallExpr::getCallReturnType() const { 753 QualType CalleeType = getCallee()->getType(); 754 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 755 CalleeType = FnTypePtr->getPointeeType(); 756 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 757 CalleeType = BPT->getPointeeType(); 758 else if (const MemberPointerType *MPT 759 = CalleeType->getAs<MemberPointerType>()) 760 CalleeType = MPT->getPointeeType(); 761 762 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 763 return FnType->getResultType(); 764} 765 766OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 767 SourceLocation OperatorLoc, 768 TypeSourceInfo *tsi, 769 OffsetOfNode* compsPtr, unsigned numComps, 770 Expr** exprsPtr, unsigned numExprs, 771 SourceLocation RParenLoc) { 772 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 773 sizeof(OffsetOfNode) * numComps + 774 sizeof(Expr*) * numExprs); 775 776 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 777 exprsPtr, numExprs, RParenLoc); 778} 779 780OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 781 unsigned numComps, unsigned numExprs) { 782 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 783 sizeof(OffsetOfNode) * numComps + 784 sizeof(Expr*) * numExprs); 785 return new (Mem) OffsetOfExpr(numComps, numExprs); 786} 787 788OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 789 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 790 OffsetOfNode* compsPtr, unsigned numComps, 791 Expr** exprsPtr, unsigned numExprs, 792 SourceLocation RParenLoc) 793 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 794 /*TypeDependent=*/false, 795 /*ValueDependent=*/tsi->getType()->isDependentType(), 796 tsi->getType()->containsUnexpandedParameterPack()), 797 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 798 NumComps(numComps), NumExprs(numExprs) 799{ 800 for(unsigned i = 0; i < numComps; ++i) { 801 setComponent(i, compsPtr[i]); 802 } 803 804 for(unsigned i = 0; i < numExprs; ++i) { 805 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 806 ExprBits.ValueDependent = true; 807 if (exprsPtr[i]->containsUnexpandedParameterPack()) 808 ExprBits.ContainsUnexpandedParameterPack = true; 809 810 setIndexExpr(i, exprsPtr[i]); 811 } 812} 813 814IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 815 assert(getKind() == Field || getKind() == Identifier); 816 if (getKind() == Field) 817 return getField()->getIdentifier(); 818 819 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 820} 821 822MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 823 NestedNameSpecifier *qual, 824 SourceRange qualrange, 825 ValueDecl *memberdecl, 826 DeclAccessPair founddecl, 827 DeclarationNameInfo nameinfo, 828 const TemplateArgumentListInfo *targs, 829 QualType ty, 830 ExprValueKind vk, 831 ExprObjectKind ok) { 832 std::size_t Size = sizeof(MemberExpr); 833 834 bool hasQualOrFound = (qual != 0 || 835 founddecl.getDecl() != memberdecl || 836 founddecl.getAccess() != memberdecl->getAccess()); 837 if (hasQualOrFound) 838 Size += sizeof(MemberNameQualifier); 839 840 if (targs) 841 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 842 843 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 844 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 845 ty, vk, ok); 846 847 if (hasQualOrFound) { 848 if (qual && qual->isDependent()) { 849 E->setValueDependent(true); 850 E->setTypeDependent(true); 851 } 852 E->HasQualifierOrFoundDecl = true; 853 854 MemberNameQualifier *NQ = E->getMemberQualifier(); 855 NQ->NNS = qual; 856 NQ->Range = qualrange; 857 NQ->FoundDecl = founddecl; 858 } 859 860 if (targs) { 861 E->HasExplicitTemplateArgumentList = true; 862 E->getExplicitTemplateArgs().initializeFrom(*targs); 863 } 864 865 return E; 866} 867 868const char *CastExpr::getCastKindName() const { 869 switch (getCastKind()) { 870 case CK_Dependent: 871 return "Dependent"; 872 case CK_BitCast: 873 return "BitCast"; 874 case CK_LValueBitCast: 875 return "LValueBitCast"; 876 case CK_LValueToRValue: 877 return "LValueToRValue"; 878 case CK_GetObjCProperty: 879 return "GetObjCProperty"; 880 case CK_NoOp: 881 return "NoOp"; 882 case CK_BaseToDerived: 883 return "BaseToDerived"; 884 case CK_DerivedToBase: 885 return "DerivedToBase"; 886 case CK_UncheckedDerivedToBase: 887 return "UncheckedDerivedToBase"; 888 case CK_Dynamic: 889 return "Dynamic"; 890 case CK_ToUnion: 891 return "ToUnion"; 892 case CK_ArrayToPointerDecay: 893 return "ArrayToPointerDecay"; 894 case CK_FunctionToPointerDecay: 895 return "FunctionToPointerDecay"; 896 case CK_NullToMemberPointer: 897 return "NullToMemberPointer"; 898 case CK_NullToPointer: 899 return "NullToPointer"; 900 case CK_BaseToDerivedMemberPointer: 901 return "BaseToDerivedMemberPointer"; 902 case CK_DerivedToBaseMemberPointer: 903 return "DerivedToBaseMemberPointer"; 904 case CK_UserDefinedConversion: 905 return "UserDefinedConversion"; 906 case CK_ConstructorConversion: 907 return "ConstructorConversion"; 908 case CK_IntegralToPointer: 909 return "IntegralToPointer"; 910 case CK_PointerToIntegral: 911 return "PointerToIntegral"; 912 case CK_PointerToBoolean: 913 return "PointerToBoolean"; 914 case CK_ToVoid: 915 return "ToVoid"; 916 case CK_VectorSplat: 917 return "VectorSplat"; 918 case CK_IntegralCast: 919 return "IntegralCast"; 920 case CK_IntegralToBoolean: 921 return "IntegralToBoolean"; 922 case CK_IntegralToFloating: 923 return "IntegralToFloating"; 924 case CK_FloatingToIntegral: 925 return "FloatingToIntegral"; 926 case CK_FloatingCast: 927 return "FloatingCast"; 928 case CK_FloatingToBoolean: 929 return "FloatingToBoolean"; 930 case CK_MemberPointerToBoolean: 931 return "MemberPointerToBoolean"; 932 case CK_AnyPointerToObjCPointerCast: 933 return "AnyPointerToObjCPointerCast"; 934 case CK_AnyPointerToBlockPointerCast: 935 return "AnyPointerToBlockPointerCast"; 936 case CK_ObjCObjectLValueCast: 937 return "ObjCObjectLValueCast"; 938 case CK_FloatingRealToComplex: 939 return "FloatingRealToComplex"; 940 case CK_FloatingComplexToReal: 941 return "FloatingComplexToReal"; 942 case CK_FloatingComplexToBoolean: 943 return "FloatingComplexToBoolean"; 944 case CK_FloatingComplexCast: 945 return "FloatingComplexCast"; 946 case CK_FloatingComplexToIntegralComplex: 947 return "FloatingComplexToIntegralComplex"; 948 case CK_IntegralRealToComplex: 949 return "IntegralRealToComplex"; 950 case CK_IntegralComplexToReal: 951 return "IntegralComplexToReal"; 952 case CK_IntegralComplexToBoolean: 953 return "IntegralComplexToBoolean"; 954 case CK_IntegralComplexCast: 955 return "IntegralComplexCast"; 956 case CK_IntegralComplexToFloatingComplex: 957 return "IntegralComplexToFloatingComplex"; 958 } 959 960 llvm_unreachable("Unhandled cast kind!"); 961 return 0; 962} 963 964Expr *CastExpr::getSubExprAsWritten() { 965 Expr *SubExpr = 0; 966 CastExpr *E = this; 967 do { 968 SubExpr = E->getSubExpr(); 969 970 // Skip any temporary bindings; they're implicit. 971 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 972 SubExpr = Binder->getSubExpr(); 973 974 // Conversions by constructor and conversion functions have a 975 // subexpression describing the call; strip it off. 976 if (E->getCastKind() == CK_ConstructorConversion) 977 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 978 else if (E->getCastKind() == CK_UserDefinedConversion) 979 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 980 981 // If the subexpression we're left with is an implicit cast, look 982 // through that, too. 983 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 984 985 return SubExpr; 986} 987 988CXXBaseSpecifier **CastExpr::path_buffer() { 989 switch (getStmtClass()) { 990#define ABSTRACT_STMT(x) 991#define CASTEXPR(Type, Base) \ 992 case Stmt::Type##Class: \ 993 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 994#define STMT(Type, Base) 995#include "clang/AST/StmtNodes.inc" 996 default: 997 llvm_unreachable("non-cast expressions not possible here"); 998 return 0; 999 } 1000} 1001 1002void CastExpr::setCastPath(const CXXCastPath &Path) { 1003 assert(Path.size() == path_size()); 1004 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1005} 1006 1007ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1008 CastKind Kind, Expr *Operand, 1009 const CXXCastPath *BasePath, 1010 ExprValueKind VK) { 1011 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1012 void *Buffer = 1013 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1014 ImplicitCastExpr *E = 1015 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1016 if (PathSize) E->setCastPath(*BasePath); 1017 return E; 1018} 1019 1020ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1021 unsigned PathSize) { 1022 void *Buffer = 1023 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1024 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1025} 1026 1027 1028CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1029 ExprValueKind VK, CastKind K, Expr *Op, 1030 const CXXCastPath *BasePath, 1031 TypeSourceInfo *WrittenTy, 1032 SourceLocation L, SourceLocation R) { 1033 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1034 void *Buffer = 1035 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1036 CStyleCastExpr *E = 1037 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1038 if (PathSize) E->setCastPath(*BasePath); 1039 return E; 1040} 1041 1042CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1043 void *Buffer = 1044 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1045 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1046} 1047 1048/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1049/// corresponds to, e.g. "<<=". 1050const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1051 switch (Op) { 1052 case BO_PtrMemD: return ".*"; 1053 case BO_PtrMemI: return "->*"; 1054 case BO_Mul: return "*"; 1055 case BO_Div: return "/"; 1056 case BO_Rem: return "%"; 1057 case BO_Add: return "+"; 1058 case BO_Sub: return "-"; 1059 case BO_Shl: return "<<"; 1060 case BO_Shr: return ">>"; 1061 case BO_LT: return "<"; 1062 case BO_GT: return ">"; 1063 case BO_LE: return "<="; 1064 case BO_GE: return ">="; 1065 case BO_EQ: return "=="; 1066 case BO_NE: return "!="; 1067 case BO_And: return "&"; 1068 case BO_Xor: return "^"; 1069 case BO_Or: return "|"; 1070 case BO_LAnd: return "&&"; 1071 case BO_LOr: return "||"; 1072 case BO_Assign: return "="; 1073 case BO_MulAssign: return "*="; 1074 case BO_DivAssign: return "/="; 1075 case BO_RemAssign: return "%="; 1076 case BO_AddAssign: return "+="; 1077 case BO_SubAssign: return "-="; 1078 case BO_ShlAssign: return "<<="; 1079 case BO_ShrAssign: return ">>="; 1080 case BO_AndAssign: return "&="; 1081 case BO_XorAssign: return "^="; 1082 case BO_OrAssign: return "|="; 1083 case BO_Comma: return ","; 1084 } 1085 1086 return ""; 1087} 1088 1089BinaryOperatorKind 1090BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1091 switch (OO) { 1092 default: assert(false && "Not an overloadable binary operator"); 1093 case OO_Plus: return BO_Add; 1094 case OO_Minus: return BO_Sub; 1095 case OO_Star: return BO_Mul; 1096 case OO_Slash: return BO_Div; 1097 case OO_Percent: return BO_Rem; 1098 case OO_Caret: return BO_Xor; 1099 case OO_Amp: return BO_And; 1100 case OO_Pipe: return BO_Or; 1101 case OO_Equal: return BO_Assign; 1102 case OO_Less: return BO_LT; 1103 case OO_Greater: return BO_GT; 1104 case OO_PlusEqual: return BO_AddAssign; 1105 case OO_MinusEqual: return BO_SubAssign; 1106 case OO_StarEqual: return BO_MulAssign; 1107 case OO_SlashEqual: return BO_DivAssign; 1108 case OO_PercentEqual: return BO_RemAssign; 1109 case OO_CaretEqual: return BO_XorAssign; 1110 case OO_AmpEqual: return BO_AndAssign; 1111 case OO_PipeEqual: return BO_OrAssign; 1112 case OO_LessLess: return BO_Shl; 1113 case OO_GreaterGreater: return BO_Shr; 1114 case OO_LessLessEqual: return BO_ShlAssign; 1115 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1116 case OO_EqualEqual: return BO_EQ; 1117 case OO_ExclaimEqual: return BO_NE; 1118 case OO_LessEqual: return BO_LE; 1119 case OO_GreaterEqual: return BO_GE; 1120 case OO_AmpAmp: return BO_LAnd; 1121 case OO_PipePipe: return BO_LOr; 1122 case OO_Comma: return BO_Comma; 1123 case OO_ArrowStar: return BO_PtrMemI; 1124 } 1125} 1126 1127OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1128 static const OverloadedOperatorKind OverOps[] = { 1129 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1130 OO_Star, OO_Slash, OO_Percent, 1131 OO_Plus, OO_Minus, 1132 OO_LessLess, OO_GreaterGreater, 1133 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1134 OO_EqualEqual, OO_ExclaimEqual, 1135 OO_Amp, 1136 OO_Caret, 1137 OO_Pipe, 1138 OO_AmpAmp, 1139 OO_PipePipe, 1140 OO_Equal, OO_StarEqual, 1141 OO_SlashEqual, OO_PercentEqual, 1142 OO_PlusEqual, OO_MinusEqual, 1143 OO_LessLessEqual, OO_GreaterGreaterEqual, 1144 OO_AmpEqual, OO_CaretEqual, 1145 OO_PipeEqual, 1146 OO_Comma 1147 }; 1148 return OverOps[Opc]; 1149} 1150 1151InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1152 Expr **initExprs, unsigned numInits, 1153 SourceLocation rbraceloc) 1154 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1155 false), 1156 InitExprs(C, numInits), 1157 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1158 UnionFieldInit(0), HadArrayRangeDesignator(false) 1159{ 1160 for (unsigned I = 0; I != numInits; ++I) { 1161 if (initExprs[I]->isTypeDependent()) 1162 ExprBits.TypeDependent = true; 1163 if (initExprs[I]->isValueDependent()) 1164 ExprBits.ValueDependent = true; 1165 if (initExprs[I]->containsUnexpandedParameterPack()) 1166 ExprBits.ContainsUnexpandedParameterPack = true; 1167 } 1168 1169 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1170} 1171 1172void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1173 if (NumInits > InitExprs.size()) 1174 InitExprs.reserve(C, NumInits); 1175} 1176 1177void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1178 InitExprs.resize(C, NumInits, 0); 1179} 1180 1181Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1182 if (Init >= InitExprs.size()) { 1183 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1184 InitExprs.back() = expr; 1185 return 0; 1186 } 1187 1188 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1189 InitExprs[Init] = expr; 1190 return Result; 1191} 1192 1193SourceRange InitListExpr::getSourceRange() const { 1194 if (SyntacticForm) 1195 return SyntacticForm->getSourceRange(); 1196 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1197 if (Beg.isInvalid()) { 1198 // Find the first non-null initializer. 1199 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1200 E = InitExprs.end(); 1201 I != E; ++I) { 1202 if (Stmt *S = *I) { 1203 Beg = S->getLocStart(); 1204 break; 1205 } 1206 } 1207 } 1208 if (End.isInvalid()) { 1209 // Find the first non-null initializer from the end. 1210 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1211 E = InitExprs.rend(); 1212 I != E; ++I) { 1213 if (Stmt *S = *I) { 1214 End = S->getSourceRange().getEnd(); 1215 break; 1216 } 1217 } 1218 } 1219 return SourceRange(Beg, End); 1220} 1221 1222/// getFunctionType - Return the underlying function type for this block. 1223/// 1224const FunctionType *BlockExpr::getFunctionType() const { 1225 return getType()->getAs<BlockPointerType>()-> 1226 getPointeeType()->getAs<FunctionType>(); 1227} 1228 1229SourceLocation BlockExpr::getCaretLocation() const { 1230 return TheBlock->getCaretLocation(); 1231} 1232const Stmt *BlockExpr::getBody() const { 1233 return TheBlock->getBody(); 1234} 1235Stmt *BlockExpr::getBody() { 1236 return TheBlock->getBody(); 1237} 1238 1239 1240//===----------------------------------------------------------------------===// 1241// Generic Expression Routines 1242//===----------------------------------------------------------------------===// 1243 1244/// isUnusedResultAWarning - Return true if this immediate expression should 1245/// be warned about if the result is unused. If so, fill in Loc and Ranges 1246/// with location to warn on and the source range[s] to report with the 1247/// warning. 1248bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1249 SourceRange &R2, ASTContext &Ctx) const { 1250 // Don't warn if the expr is type dependent. The type could end up 1251 // instantiating to void. 1252 if (isTypeDependent()) 1253 return false; 1254 1255 switch (getStmtClass()) { 1256 default: 1257 if (getType()->isVoidType()) 1258 return false; 1259 Loc = getExprLoc(); 1260 R1 = getSourceRange(); 1261 return true; 1262 case ParenExprClass: 1263 return cast<ParenExpr>(this)->getSubExpr()-> 1264 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1265 case UnaryOperatorClass: { 1266 const UnaryOperator *UO = cast<UnaryOperator>(this); 1267 1268 switch (UO->getOpcode()) { 1269 default: break; 1270 case UO_PostInc: 1271 case UO_PostDec: 1272 case UO_PreInc: 1273 case UO_PreDec: // ++/-- 1274 return false; // Not a warning. 1275 case UO_Deref: 1276 // Dereferencing a volatile pointer is a side-effect. 1277 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1278 return false; 1279 break; 1280 case UO_Real: 1281 case UO_Imag: 1282 // accessing a piece of a volatile complex is a side-effect. 1283 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1284 .isVolatileQualified()) 1285 return false; 1286 break; 1287 case UO_Extension: 1288 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1289 } 1290 Loc = UO->getOperatorLoc(); 1291 R1 = UO->getSubExpr()->getSourceRange(); 1292 return true; 1293 } 1294 case BinaryOperatorClass: { 1295 const BinaryOperator *BO = cast<BinaryOperator>(this); 1296 switch (BO->getOpcode()) { 1297 default: 1298 break; 1299 // Consider the RHS of comma for side effects. LHS was checked by 1300 // Sema::CheckCommaOperands. 1301 case BO_Comma: 1302 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1303 // lvalue-ness) of an assignment written in a macro. 1304 if (IntegerLiteral *IE = 1305 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1306 if (IE->getValue() == 0) 1307 return false; 1308 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1309 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1310 case BO_LAnd: 1311 case BO_LOr: 1312 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1313 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1314 return false; 1315 break; 1316 } 1317 if (BO->isAssignmentOp()) 1318 return false; 1319 Loc = BO->getOperatorLoc(); 1320 R1 = BO->getLHS()->getSourceRange(); 1321 R2 = BO->getRHS()->getSourceRange(); 1322 return true; 1323 } 1324 case CompoundAssignOperatorClass: 1325 case VAArgExprClass: 1326 return false; 1327 1328 case ConditionalOperatorClass: { 1329 // The condition must be evaluated, but if either the LHS or RHS is a 1330 // warning, warn about them. 1331 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1332 if (Exp->getLHS() && 1333 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1334 return true; 1335 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1336 } 1337 1338 case MemberExprClass: 1339 // If the base pointer or element is to a volatile pointer/field, accessing 1340 // it is a side effect. 1341 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1342 return false; 1343 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1344 R1 = SourceRange(Loc, Loc); 1345 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1346 return true; 1347 1348 case ArraySubscriptExprClass: 1349 // If the base pointer or element is to a volatile pointer/field, accessing 1350 // it is a side effect. 1351 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1352 return false; 1353 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1354 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1355 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1356 return true; 1357 1358 case CallExprClass: 1359 case CXXOperatorCallExprClass: 1360 case CXXMemberCallExprClass: { 1361 // If this is a direct call, get the callee. 1362 const CallExpr *CE = cast<CallExpr>(this); 1363 if (const Decl *FD = CE->getCalleeDecl()) { 1364 // If the callee has attribute pure, const, or warn_unused_result, warn 1365 // about it. void foo() { strlen("bar"); } should warn. 1366 // 1367 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1368 // updated to match for QoI. 1369 if (FD->getAttr<WarnUnusedResultAttr>() || 1370 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1371 Loc = CE->getCallee()->getLocStart(); 1372 R1 = CE->getCallee()->getSourceRange(); 1373 1374 if (unsigned NumArgs = CE->getNumArgs()) 1375 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1376 CE->getArg(NumArgs-1)->getLocEnd()); 1377 return true; 1378 } 1379 } 1380 return false; 1381 } 1382 1383 case CXXTemporaryObjectExprClass: 1384 case CXXConstructExprClass: 1385 return false; 1386 1387 case ObjCMessageExprClass: { 1388 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1389 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1390 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1391 Loc = getExprLoc(); 1392 return true; 1393 } 1394 return false; 1395 } 1396 1397 case ObjCPropertyRefExprClass: 1398 Loc = getExprLoc(); 1399 R1 = getSourceRange(); 1400 return true; 1401 1402 case StmtExprClass: { 1403 // Statement exprs don't logically have side effects themselves, but are 1404 // sometimes used in macros in ways that give them a type that is unused. 1405 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1406 // however, if the result of the stmt expr is dead, we don't want to emit a 1407 // warning. 1408 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1409 if (!CS->body_empty()) { 1410 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1411 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1412 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1413 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1414 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1415 } 1416 1417 if (getType()->isVoidType()) 1418 return false; 1419 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1420 R1 = getSourceRange(); 1421 return true; 1422 } 1423 case CStyleCastExprClass: 1424 // If this is an explicit cast to void, allow it. People do this when they 1425 // think they know what they're doing :). 1426 if (getType()->isVoidType()) 1427 return false; 1428 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1429 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1430 return true; 1431 case CXXFunctionalCastExprClass: { 1432 if (getType()->isVoidType()) 1433 return false; 1434 const CastExpr *CE = cast<CastExpr>(this); 1435 1436 // If this is a cast to void or a constructor conversion, check the operand. 1437 // Otherwise, the result of the cast is unused. 1438 if (CE->getCastKind() == CK_ToVoid || 1439 CE->getCastKind() == CK_ConstructorConversion) 1440 return (cast<CastExpr>(this)->getSubExpr() 1441 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1442 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1443 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1444 return true; 1445 } 1446 1447 case ImplicitCastExprClass: 1448 // Check the operand, since implicit casts are inserted by Sema 1449 return (cast<ImplicitCastExpr>(this) 1450 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1451 1452 case CXXDefaultArgExprClass: 1453 return (cast<CXXDefaultArgExpr>(this) 1454 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1455 1456 case CXXNewExprClass: 1457 // FIXME: In theory, there might be new expressions that don't have side 1458 // effects (e.g. a placement new with an uninitialized POD). 1459 case CXXDeleteExprClass: 1460 return false; 1461 case CXXBindTemporaryExprClass: 1462 return (cast<CXXBindTemporaryExpr>(this) 1463 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1464 case ExprWithCleanupsClass: 1465 return (cast<ExprWithCleanups>(this) 1466 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1467 } 1468} 1469 1470/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1471/// returns true, if it is; false otherwise. 1472bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1473 switch (getStmtClass()) { 1474 default: 1475 return false; 1476 case ObjCIvarRefExprClass: 1477 return true; 1478 case Expr::UnaryOperatorClass: 1479 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1480 case ParenExprClass: 1481 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1482 case ImplicitCastExprClass: 1483 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1484 case CStyleCastExprClass: 1485 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1486 case DeclRefExprClass: { 1487 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1488 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1489 if (VD->hasGlobalStorage()) 1490 return true; 1491 QualType T = VD->getType(); 1492 // dereferencing to a pointer is always a gc'able candidate, 1493 // unless it is __weak. 1494 return T->isPointerType() && 1495 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1496 } 1497 return false; 1498 } 1499 case MemberExprClass: { 1500 const MemberExpr *M = cast<MemberExpr>(this); 1501 return M->getBase()->isOBJCGCCandidate(Ctx); 1502 } 1503 case ArraySubscriptExprClass: 1504 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1505 } 1506} 1507 1508bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1509 if (isTypeDependent()) 1510 return false; 1511 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1512} 1513 1514static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1515 Expr::CanThrowResult CT2) { 1516 // CanThrowResult constants are ordered so that the maximum is the correct 1517 // merge result. 1518 return CT1 > CT2 ? CT1 : CT2; 1519} 1520 1521static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1522 Expr *E = const_cast<Expr*>(CE); 1523 Expr::CanThrowResult R = Expr::CT_Cannot; 1524 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1525 I != IE && R != Expr::CT_Can; ++I) { 1526 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1527 } 1528 return R; 1529} 1530 1531static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1532 bool NullThrows = true) { 1533 if (!D) 1534 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1535 1536 // See if we can get a function type from the decl somehow. 1537 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1538 if (!VD) // If we have no clue what we're calling, assume the worst. 1539 return Expr::CT_Can; 1540 1541 // As an extension, we assume that __attribute__((nothrow)) functions don't 1542 // throw. 1543 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1544 return Expr::CT_Cannot; 1545 1546 QualType T = VD->getType(); 1547 const FunctionProtoType *FT; 1548 if ((FT = T->getAs<FunctionProtoType>())) { 1549 } else if (const PointerType *PT = T->getAs<PointerType>()) 1550 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1551 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1552 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1553 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1554 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1555 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1556 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1557 1558 if (!FT) 1559 return Expr::CT_Can; 1560 1561 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1562} 1563 1564static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1565 if (DC->isTypeDependent()) 1566 return Expr::CT_Dependent; 1567 1568 if (!DC->getTypeAsWritten()->isReferenceType()) 1569 return Expr::CT_Cannot; 1570 1571 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1572} 1573 1574static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1575 const CXXTypeidExpr *DC) { 1576 if (DC->isTypeOperand()) 1577 return Expr::CT_Cannot; 1578 1579 Expr *Op = DC->getExprOperand(); 1580 if (Op->isTypeDependent()) 1581 return Expr::CT_Dependent; 1582 1583 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1584 if (!RT) 1585 return Expr::CT_Cannot; 1586 1587 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1588 return Expr::CT_Cannot; 1589 1590 if (Op->Classify(C).isPRValue()) 1591 return Expr::CT_Cannot; 1592 1593 return Expr::CT_Can; 1594} 1595 1596Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1597 // C++ [expr.unary.noexcept]p3: 1598 // [Can throw] if in a potentially-evaluated context the expression would 1599 // contain: 1600 switch (getStmtClass()) { 1601 case CXXThrowExprClass: 1602 // - a potentially evaluated throw-expression 1603 return CT_Can; 1604 1605 case CXXDynamicCastExprClass: { 1606 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1607 // where T is a reference type, that requires a run-time check 1608 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1609 if (CT == CT_Can) 1610 return CT; 1611 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1612 } 1613 1614 case CXXTypeidExprClass: 1615 // - a potentially evaluated typeid expression applied to a glvalue 1616 // expression whose type is a polymorphic class type 1617 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1618 1619 // - a potentially evaluated call to a function, member function, function 1620 // pointer, or member function pointer that does not have a non-throwing 1621 // exception-specification 1622 case CallExprClass: 1623 case CXXOperatorCallExprClass: 1624 case CXXMemberCallExprClass: { 1625 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1626 if (CT == CT_Can) 1627 return CT; 1628 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1629 } 1630 1631 case CXXConstructExprClass: 1632 case CXXTemporaryObjectExprClass: { 1633 CanThrowResult CT = CanCalleeThrow( 1634 cast<CXXConstructExpr>(this)->getConstructor()); 1635 if (CT == CT_Can) 1636 return CT; 1637 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1638 } 1639 1640 case CXXNewExprClass: { 1641 CanThrowResult CT = MergeCanThrow( 1642 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1643 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1644 /*NullThrows*/false)); 1645 if (CT == CT_Can) 1646 return CT; 1647 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1648 } 1649 1650 case CXXDeleteExprClass: { 1651 CanThrowResult CT = CanCalleeThrow( 1652 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1653 if (CT == CT_Can) 1654 return CT; 1655 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1656 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1657 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1658 Arg = Cast->getSubExpr(); 1659 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1660 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1661 CanThrowResult CT2 = CanCalleeThrow( 1662 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1663 if (CT2 == CT_Can) 1664 return CT2; 1665 CT = MergeCanThrow(CT, CT2); 1666 } 1667 } 1668 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1669 } 1670 1671 case CXXBindTemporaryExprClass: { 1672 // The bound temporary has to be destroyed again, which might throw. 1673 CanThrowResult CT = CanCalleeThrow( 1674 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1675 if (CT == CT_Can) 1676 return CT; 1677 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1678 } 1679 1680 // ObjC message sends are like function calls, but never have exception 1681 // specs. 1682 case ObjCMessageExprClass: 1683 case ObjCPropertyRefExprClass: 1684 return CT_Can; 1685 1686 // Many other things have subexpressions, so we have to test those. 1687 // Some are simple: 1688 case ParenExprClass: 1689 case MemberExprClass: 1690 case CXXReinterpretCastExprClass: 1691 case CXXConstCastExprClass: 1692 case ConditionalOperatorClass: 1693 case CompoundLiteralExprClass: 1694 case ExtVectorElementExprClass: 1695 case InitListExprClass: 1696 case DesignatedInitExprClass: 1697 case ParenListExprClass: 1698 case VAArgExprClass: 1699 case CXXDefaultArgExprClass: 1700 case ExprWithCleanupsClass: 1701 case ObjCIvarRefExprClass: 1702 case ObjCIsaExprClass: 1703 case ShuffleVectorExprClass: 1704 return CanSubExprsThrow(C, this); 1705 1706 // Some might be dependent for other reasons. 1707 case UnaryOperatorClass: 1708 case ArraySubscriptExprClass: 1709 case ImplicitCastExprClass: 1710 case CStyleCastExprClass: 1711 case CXXStaticCastExprClass: 1712 case CXXFunctionalCastExprClass: 1713 case BinaryOperatorClass: 1714 case CompoundAssignOperatorClass: { 1715 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1716 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1717 } 1718 1719 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1720 case StmtExprClass: 1721 return CT_Can; 1722 1723 case ChooseExprClass: 1724 if (isTypeDependent() || isValueDependent()) 1725 return CT_Dependent; 1726 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1727 1728 // Some expressions are always dependent. 1729 case DependentScopeDeclRefExprClass: 1730 case CXXUnresolvedConstructExprClass: 1731 case CXXDependentScopeMemberExprClass: 1732 return CT_Dependent; 1733 1734 default: 1735 // All other expressions don't have subexpressions, or else they are 1736 // unevaluated. 1737 return CT_Cannot; 1738 } 1739} 1740 1741Expr* Expr::IgnoreParens() { 1742 Expr* E = this; 1743 while (true) { 1744 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1745 E = P->getSubExpr(); 1746 continue; 1747 } 1748 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1749 if (P->getOpcode() == UO_Extension) { 1750 E = P->getSubExpr(); 1751 continue; 1752 } 1753 } 1754 return E; 1755 } 1756} 1757 1758/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1759/// or CastExprs or ImplicitCastExprs, returning their operand. 1760Expr *Expr::IgnoreParenCasts() { 1761 Expr *E = this; 1762 while (true) { 1763 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1764 E = P->getSubExpr(); 1765 continue; 1766 } 1767 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1768 E = P->getSubExpr(); 1769 continue; 1770 } 1771 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1772 if (P->getOpcode() == UO_Extension) { 1773 E = P->getSubExpr(); 1774 continue; 1775 } 1776 } 1777 return E; 1778 } 1779} 1780 1781/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1782/// casts. This is intended purely as a temporary workaround for code 1783/// that hasn't yet been rewritten to do the right thing about those 1784/// casts, and may disappear along with the last internal use. 1785Expr *Expr::IgnoreParenLValueCasts() { 1786 Expr *E = this; 1787 while (true) { 1788 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1789 E = P->getSubExpr(); 1790 continue; 1791 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1792 if (P->getCastKind() == CK_LValueToRValue) { 1793 E = P->getSubExpr(); 1794 continue; 1795 } 1796 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1797 if (P->getOpcode() == UO_Extension) { 1798 E = P->getSubExpr(); 1799 continue; 1800 } 1801 } 1802 break; 1803 } 1804 return E; 1805} 1806 1807Expr *Expr::IgnoreParenImpCasts() { 1808 Expr *E = this; 1809 while (true) { 1810 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1811 E = P->getSubExpr(); 1812 continue; 1813 } 1814 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1815 E = P->getSubExpr(); 1816 continue; 1817 } 1818 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1819 if (P->getOpcode() == UO_Extension) { 1820 E = P->getSubExpr(); 1821 continue; 1822 } 1823 } 1824 return E; 1825 } 1826} 1827 1828/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1829/// value (including ptr->int casts of the same size). Strip off any 1830/// ParenExpr or CastExprs, returning their operand. 1831Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1832 Expr *E = this; 1833 while (true) { 1834 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1835 E = P->getSubExpr(); 1836 continue; 1837 } 1838 1839 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1840 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1841 // ptr<->int casts of the same width. We also ignore all identity casts. 1842 Expr *SE = P->getSubExpr(); 1843 1844 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1845 E = SE; 1846 continue; 1847 } 1848 1849 if ((E->getType()->isPointerType() || 1850 E->getType()->isIntegralType(Ctx)) && 1851 (SE->getType()->isPointerType() || 1852 SE->getType()->isIntegralType(Ctx)) && 1853 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1854 E = SE; 1855 continue; 1856 } 1857 } 1858 1859 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1860 if (P->getOpcode() == UO_Extension) { 1861 E = P->getSubExpr(); 1862 continue; 1863 } 1864 } 1865 1866 return E; 1867 } 1868} 1869 1870bool Expr::isDefaultArgument() const { 1871 const Expr *E = this; 1872 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1873 E = ICE->getSubExprAsWritten(); 1874 1875 return isa<CXXDefaultArgExpr>(E); 1876} 1877 1878/// \brief Skip over any no-op casts and any temporary-binding 1879/// expressions. 1880static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1881 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1882 if (ICE->getCastKind() == CK_NoOp) 1883 E = ICE->getSubExpr(); 1884 else 1885 break; 1886 } 1887 1888 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1889 E = BE->getSubExpr(); 1890 1891 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1892 if (ICE->getCastKind() == CK_NoOp) 1893 E = ICE->getSubExpr(); 1894 else 1895 break; 1896 } 1897 1898 return E->IgnoreParens(); 1899} 1900 1901/// isTemporaryObject - Determines if this expression produces a 1902/// temporary of the given class type. 1903bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1904 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1905 return false; 1906 1907 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1908 1909 // Temporaries are by definition pr-values of class type. 1910 if (!E->Classify(C).isPRValue()) { 1911 // In this context, property reference is a message call and is pr-value. 1912 if (!isa<ObjCPropertyRefExpr>(E)) 1913 return false; 1914 } 1915 1916 // Black-list a few cases which yield pr-values of class type that don't 1917 // refer to temporaries of that type: 1918 1919 // - implicit derived-to-base conversions 1920 if (isa<ImplicitCastExpr>(E)) { 1921 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1922 case CK_DerivedToBase: 1923 case CK_UncheckedDerivedToBase: 1924 return false; 1925 default: 1926 break; 1927 } 1928 } 1929 1930 // - member expressions (all) 1931 if (isa<MemberExpr>(E)) 1932 return false; 1933 1934 return true; 1935} 1936 1937/// hasAnyTypeDependentArguments - Determines if any of the expressions 1938/// in Exprs is type-dependent. 1939bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1940 for (unsigned I = 0; I < NumExprs; ++I) 1941 if (Exprs[I]->isTypeDependent()) 1942 return true; 1943 1944 return false; 1945} 1946 1947/// hasAnyValueDependentArguments - Determines if any of the expressions 1948/// in Exprs is value-dependent. 1949bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1950 for (unsigned I = 0; I < NumExprs; ++I) 1951 if (Exprs[I]->isValueDependent()) 1952 return true; 1953 1954 return false; 1955} 1956 1957bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1958 // This function is attempting whether an expression is an initializer 1959 // which can be evaluated at compile-time. isEvaluatable handles most 1960 // of the cases, but it can't deal with some initializer-specific 1961 // expressions, and it can't deal with aggregates; we deal with those here, 1962 // and fall back to isEvaluatable for the other cases. 1963 1964 // If we ever capture reference-binding directly in the AST, we can 1965 // kill the second parameter. 1966 1967 if (IsForRef) { 1968 EvalResult Result; 1969 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1970 } 1971 1972 switch (getStmtClass()) { 1973 default: break; 1974 case StringLiteralClass: 1975 case ObjCStringLiteralClass: 1976 case ObjCEncodeExprClass: 1977 return true; 1978 case CXXTemporaryObjectExprClass: 1979 case CXXConstructExprClass: { 1980 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 1981 1982 // Only if it's 1983 // 1) an application of the trivial default constructor or 1984 if (!CE->getConstructor()->isTrivial()) return false; 1985 if (!CE->getNumArgs()) return true; 1986 1987 // 2) an elidable trivial copy construction of an operand which is 1988 // itself a constant initializer. Note that we consider the 1989 // operand on its own, *not* as a reference binding. 1990 return CE->isElidable() && 1991 CE->getArg(0)->isConstantInitializer(Ctx, false); 1992 } 1993 case CompoundLiteralExprClass: { 1994 // This handles gcc's extension that allows global initializers like 1995 // "struct x {int x;} x = (struct x) {};". 1996 // FIXME: This accepts other cases it shouldn't! 1997 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1998 return Exp->isConstantInitializer(Ctx, false); 1999 } 2000 case InitListExprClass: { 2001 // FIXME: This doesn't deal with fields with reference types correctly. 2002 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2003 // to bitfields. 2004 const InitListExpr *Exp = cast<InitListExpr>(this); 2005 unsigned numInits = Exp->getNumInits(); 2006 for (unsigned i = 0; i < numInits; i++) { 2007 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2008 return false; 2009 } 2010 return true; 2011 } 2012 case ImplicitValueInitExprClass: 2013 return true; 2014 case ParenExprClass: 2015 return cast<ParenExpr>(this)->getSubExpr() 2016 ->isConstantInitializer(Ctx, IsForRef); 2017 case ChooseExprClass: 2018 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2019 ->isConstantInitializer(Ctx, IsForRef); 2020 case UnaryOperatorClass: { 2021 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2022 if (Exp->getOpcode() == UO_Extension) 2023 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2024 break; 2025 } 2026 case BinaryOperatorClass: { 2027 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2028 // but this handles the common case. 2029 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2030 if (Exp->getOpcode() == BO_Sub && 2031 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2032 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2033 return true; 2034 break; 2035 } 2036 case CXXFunctionalCastExprClass: 2037 case CXXStaticCastExprClass: 2038 case ImplicitCastExprClass: 2039 case CStyleCastExprClass: 2040 // Handle casts with a destination that's a struct or union; this 2041 // deals with both the gcc no-op struct cast extension and the 2042 // cast-to-union extension. 2043 if (getType()->isRecordType()) 2044 return cast<CastExpr>(this)->getSubExpr() 2045 ->isConstantInitializer(Ctx, false); 2046 2047 // Integer->integer casts can be handled here, which is important for 2048 // things like (int)(&&x-&&y). Scary but true. 2049 if (getType()->isIntegerType() && 2050 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2051 return cast<CastExpr>(this)->getSubExpr() 2052 ->isConstantInitializer(Ctx, false); 2053 2054 break; 2055 } 2056 return isEvaluatable(Ctx); 2057} 2058 2059/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2060/// integer constant expression with the value zero, or if this is one that is 2061/// cast to void*. 2062bool Expr::isNullPointerConstant(ASTContext &Ctx, 2063 NullPointerConstantValueDependence NPC) const { 2064 if (isValueDependent()) { 2065 switch (NPC) { 2066 case NPC_NeverValueDependent: 2067 assert(false && "Unexpected value dependent expression!"); 2068 // If the unthinkable happens, fall through to the safest alternative. 2069 2070 case NPC_ValueDependentIsNull: 2071 return isTypeDependent() || getType()->isIntegralType(Ctx); 2072 2073 case NPC_ValueDependentIsNotNull: 2074 return false; 2075 } 2076 } 2077 2078 // Strip off a cast to void*, if it exists. Except in C++. 2079 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2080 if (!Ctx.getLangOptions().CPlusPlus) { 2081 // Check that it is a cast to void*. 2082 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2083 QualType Pointee = PT->getPointeeType(); 2084 if (!Pointee.hasQualifiers() && 2085 Pointee->isVoidType() && // to void* 2086 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2087 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2088 } 2089 } 2090 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2091 // Ignore the ImplicitCastExpr type entirely. 2092 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2093 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2094 // Accept ((void*)0) as a null pointer constant, as many other 2095 // implementations do. 2096 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2097 } else if (const CXXDefaultArgExpr *DefaultArg 2098 = dyn_cast<CXXDefaultArgExpr>(this)) { 2099 // See through default argument expressions 2100 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2101 } else if (isa<GNUNullExpr>(this)) { 2102 // The GNU __null extension is always a null pointer constant. 2103 return true; 2104 } 2105 2106 // C++0x nullptr_t is always a null pointer constant. 2107 if (getType()->isNullPtrType()) 2108 return true; 2109 2110 if (const RecordType *UT = getType()->getAsUnionType()) 2111 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2112 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2113 const Expr *InitExpr = CLE->getInitializer(); 2114 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2115 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2116 } 2117 // This expression must be an integer type. 2118 if (!getType()->isIntegerType() || 2119 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2120 return false; 2121 2122 // If we have an integer constant expression, we need to *evaluate* it and 2123 // test for the value 0. 2124 llvm::APSInt Result; 2125 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2126} 2127 2128/// \brief If this expression is an l-value for an Objective C 2129/// property, find the underlying property reference expression. 2130const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2131 const Expr *E = this; 2132 while (true) { 2133 assert((E->getValueKind() == VK_LValue && 2134 E->getObjectKind() == OK_ObjCProperty) && 2135 "expression is not a property reference"); 2136 E = E->IgnoreParenCasts(); 2137 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2138 if (BO->getOpcode() == BO_Comma) { 2139 E = BO->getRHS(); 2140 continue; 2141 } 2142 } 2143 2144 break; 2145 } 2146 2147 return cast<ObjCPropertyRefExpr>(E); 2148} 2149 2150FieldDecl *Expr::getBitField() { 2151 Expr *E = this->IgnoreParens(); 2152 2153 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2154 if (ICE->getCastKind() == CK_LValueToRValue || 2155 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2156 E = ICE->getSubExpr()->IgnoreParens(); 2157 else 2158 break; 2159 } 2160 2161 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2162 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2163 if (Field->isBitField()) 2164 return Field; 2165 2166 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2167 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2168 if (Field->isBitField()) 2169 return Field; 2170 2171 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2172 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2173 return BinOp->getLHS()->getBitField(); 2174 2175 return 0; 2176} 2177 2178bool Expr::refersToVectorElement() const { 2179 const Expr *E = this->IgnoreParens(); 2180 2181 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2182 if (ICE->getValueKind() != VK_RValue && 2183 ICE->getCastKind() == CK_NoOp) 2184 E = ICE->getSubExpr()->IgnoreParens(); 2185 else 2186 break; 2187 } 2188 2189 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2190 return ASE->getBase()->getType()->isVectorType(); 2191 2192 if (isa<ExtVectorElementExpr>(E)) 2193 return true; 2194 2195 return false; 2196} 2197 2198/// isArrow - Return true if the base expression is a pointer to vector, 2199/// return false if the base expression is a vector. 2200bool ExtVectorElementExpr::isArrow() const { 2201 return getBase()->getType()->isPointerType(); 2202} 2203 2204unsigned ExtVectorElementExpr::getNumElements() const { 2205 if (const VectorType *VT = getType()->getAs<VectorType>()) 2206 return VT->getNumElements(); 2207 return 1; 2208} 2209 2210/// containsDuplicateElements - Return true if any element access is repeated. 2211bool ExtVectorElementExpr::containsDuplicateElements() const { 2212 // FIXME: Refactor this code to an accessor on the AST node which returns the 2213 // "type" of component access, and share with code below and in Sema. 2214 llvm::StringRef Comp = Accessor->getName(); 2215 2216 // Halving swizzles do not contain duplicate elements. 2217 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2218 return false; 2219 2220 // Advance past s-char prefix on hex swizzles. 2221 if (Comp[0] == 's' || Comp[0] == 'S') 2222 Comp = Comp.substr(1); 2223 2224 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2225 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2226 return true; 2227 2228 return false; 2229} 2230 2231/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2232void ExtVectorElementExpr::getEncodedElementAccess( 2233 llvm::SmallVectorImpl<unsigned> &Elts) const { 2234 llvm::StringRef Comp = Accessor->getName(); 2235 if (Comp[0] == 's' || Comp[0] == 'S') 2236 Comp = Comp.substr(1); 2237 2238 bool isHi = Comp == "hi"; 2239 bool isLo = Comp == "lo"; 2240 bool isEven = Comp == "even"; 2241 bool isOdd = Comp == "odd"; 2242 2243 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2244 uint64_t Index; 2245 2246 if (isHi) 2247 Index = e + i; 2248 else if (isLo) 2249 Index = i; 2250 else if (isEven) 2251 Index = 2 * i; 2252 else if (isOdd) 2253 Index = 2 * i + 1; 2254 else 2255 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2256 2257 Elts.push_back(Index); 2258 } 2259} 2260 2261ObjCMessageExpr::ObjCMessageExpr(QualType T, 2262 ExprValueKind VK, 2263 SourceLocation LBracLoc, 2264 SourceLocation SuperLoc, 2265 bool IsInstanceSuper, 2266 QualType SuperType, 2267 Selector Sel, 2268 SourceLocation SelLoc, 2269 ObjCMethodDecl *Method, 2270 Expr **Args, unsigned NumArgs, 2271 SourceLocation RBracLoc) 2272 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2273 /*TypeDependent=*/false, /*ValueDependent=*/false, 2274 /*ContainsUnexpandedParameterPack=*/false), 2275 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2276 HasMethod(Method != 0), SuperLoc(SuperLoc), 2277 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2278 : Sel.getAsOpaquePtr())), 2279 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2280{ 2281 setReceiverPointer(SuperType.getAsOpaquePtr()); 2282 if (NumArgs) 2283 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2284} 2285 2286ObjCMessageExpr::ObjCMessageExpr(QualType T, 2287 ExprValueKind VK, 2288 SourceLocation LBracLoc, 2289 TypeSourceInfo *Receiver, 2290 Selector Sel, 2291 SourceLocation SelLoc, 2292 ObjCMethodDecl *Method, 2293 Expr **Args, unsigned NumArgs, 2294 SourceLocation RBracLoc) 2295 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2296 T->isDependentType(), T->containsUnexpandedParameterPack()), 2297 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2298 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2299 : Sel.getAsOpaquePtr())), 2300 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2301{ 2302 setReceiverPointer(Receiver); 2303 Expr **MyArgs = getArgs(); 2304 for (unsigned I = 0; I != NumArgs; ++I) { 2305 if (Args[I]->isTypeDependent()) 2306 ExprBits.TypeDependent = true; 2307 if (Args[I]->isValueDependent()) 2308 ExprBits.ValueDependent = true; 2309 if (Args[I]->containsUnexpandedParameterPack()) 2310 ExprBits.ContainsUnexpandedParameterPack = true; 2311 2312 MyArgs[I] = Args[I]; 2313 } 2314} 2315 2316ObjCMessageExpr::ObjCMessageExpr(QualType T, 2317 ExprValueKind VK, 2318 SourceLocation LBracLoc, 2319 Expr *Receiver, 2320 Selector Sel, 2321 SourceLocation SelLoc, 2322 ObjCMethodDecl *Method, 2323 Expr **Args, unsigned NumArgs, 2324 SourceLocation RBracLoc) 2325 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2326 Receiver->isTypeDependent(), 2327 Receiver->containsUnexpandedParameterPack()), 2328 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2329 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2330 : Sel.getAsOpaquePtr())), 2331 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2332{ 2333 setReceiverPointer(Receiver); 2334 Expr **MyArgs = getArgs(); 2335 for (unsigned I = 0; I != NumArgs; ++I) { 2336 if (Args[I]->isTypeDependent()) 2337 ExprBits.TypeDependent = true; 2338 if (Args[I]->isValueDependent()) 2339 ExprBits.ValueDependent = true; 2340 if (Args[I]->containsUnexpandedParameterPack()) 2341 ExprBits.ContainsUnexpandedParameterPack = true; 2342 2343 MyArgs[I] = Args[I]; 2344 } 2345} 2346 2347ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2348 ExprValueKind VK, 2349 SourceLocation LBracLoc, 2350 SourceLocation SuperLoc, 2351 bool IsInstanceSuper, 2352 QualType SuperType, 2353 Selector Sel, 2354 SourceLocation SelLoc, 2355 ObjCMethodDecl *Method, 2356 Expr **Args, unsigned NumArgs, 2357 SourceLocation RBracLoc) { 2358 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2359 NumArgs * sizeof(Expr *); 2360 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2361 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2362 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2363 RBracLoc); 2364} 2365 2366ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2367 ExprValueKind VK, 2368 SourceLocation LBracLoc, 2369 TypeSourceInfo *Receiver, 2370 Selector Sel, 2371 SourceLocation SelLoc, 2372 ObjCMethodDecl *Method, 2373 Expr **Args, unsigned NumArgs, 2374 SourceLocation RBracLoc) { 2375 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2376 NumArgs * sizeof(Expr *); 2377 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2378 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2379 Method, Args, NumArgs, RBracLoc); 2380} 2381 2382ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2383 ExprValueKind VK, 2384 SourceLocation LBracLoc, 2385 Expr *Receiver, 2386 Selector Sel, 2387 SourceLocation SelLoc, 2388 ObjCMethodDecl *Method, 2389 Expr **Args, unsigned NumArgs, 2390 SourceLocation RBracLoc) { 2391 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2392 NumArgs * sizeof(Expr *); 2393 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2394 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2395 Method, Args, NumArgs, RBracLoc); 2396} 2397 2398ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2399 unsigned NumArgs) { 2400 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2401 NumArgs * sizeof(Expr *); 2402 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2403 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2404} 2405 2406SourceRange ObjCMessageExpr::getReceiverRange() const { 2407 switch (getReceiverKind()) { 2408 case Instance: 2409 return getInstanceReceiver()->getSourceRange(); 2410 2411 case Class: 2412 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2413 2414 case SuperInstance: 2415 case SuperClass: 2416 return getSuperLoc(); 2417 } 2418 2419 return SourceLocation(); 2420} 2421 2422Selector ObjCMessageExpr::getSelector() const { 2423 if (HasMethod) 2424 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2425 ->getSelector(); 2426 return Selector(SelectorOrMethod); 2427} 2428 2429ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2430 switch (getReceiverKind()) { 2431 case Instance: 2432 if (const ObjCObjectPointerType *Ptr 2433 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2434 return Ptr->getInterfaceDecl(); 2435 break; 2436 2437 case Class: 2438 if (const ObjCObjectType *Ty 2439 = getClassReceiver()->getAs<ObjCObjectType>()) 2440 return Ty->getInterface(); 2441 break; 2442 2443 case SuperInstance: 2444 if (const ObjCObjectPointerType *Ptr 2445 = getSuperType()->getAs<ObjCObjectPointerType>()) 2446 return Ptr->getInterfaceDecl(); 2447 break; 2448 2449 case SuperClass: 2450 if (const ObjCObjectPointerType *Iface 2451 = getSuperType()->getAs<ObjCObjectPointerType>()) 2452 return Iface->getInterfaceDecl(); 2453 break; 2454 } 2455 2456 return 0; 2457} 2458 2459bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2460 return getCond()->EvaluateAsInt(C) != 0; 2461} 2462 2463ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2464 QualType Type, SourceLocation BLoc, 2465 SourceLocation RP) 2466 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2467 Type->isDependentType(), Type->isDependentType(), 2468 Type->containsUnexpandedParameterPack()), 2469 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2470{ 2471 SubExprs = new (C) Stmt*[nexpr]; 2472 for (unsigned i = 0; i < nexpr; i++) { 2473 if (args[i]->isTypeDependent()) 2474 ExprBits.TypeDependent = true; 2475 if (args[i]->isValueDependent()) 2476 ExprBits.ValueDependent = true; 2477 if (args[i]->containsUnexpandedParameterPack()) 2478 ExprBits.ContainsUnexpandedParameterPack = true; 2479 2480 SubExprs[i] = args[i]; 2481 } 2482} 2483 2484void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2485 unsigned NumExprs) { 2486 if (SubExprs) C.Deallocate(SubExprs); 2487 2488 SubExprs = new (C) Stmt* [NumExprs]; 2489 this->NumExprs = NumExprs; 2490 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2491} 2492 2493//===----------------------------------------------------------------------===// 2494// DesignatedInitExpr 2495//===----------------------------------------------------------------------===// 2496 2497IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2498 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2499 if (Field.NameOrField & 0x01) 2500 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2501 else 2502 return getField()->getIdentifier(); 2503} 2504 2505DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2506 unsigned NumDesignators, 2507 const Designator *Designators, 2508 SourceLocation EqualOrColonLoc, 2509 bool GNUSyntax, 2510 Expr **IndexExprs, 2511 unsigned NumIndexExprs, 2512 Expr *Init) 2513 : Expr(DesignatedInitExprClass, Ty, 2514 Init->getValueKind(), Init->getObjectKind(), 2515 Init->isTypeDependent(), Init->isValueDependent(), 2516 Init->containsUnexpandedParameterPack()), 2517 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2518 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2519 this->Designators = new (C) Designator[NumDesignators]; 2520 2521 // Record the initializer itself. 2522 child_iterator Child = child_begin(); 2523 *Child++ = Init; 2524 2525 // Copy the designators and their subexpressions, computing 2526 // value-dependence along the way. 2527 unsigned IndexIdx = 0; 2528 for (unsigned I = 0; I != NumDesignators; ++I) { 2529 this->Designators[I] = Designators[I]; 2530 2531 if (this->Designators[I].isArrayDesignator()) { 2532 // Compute type- and value-dependence. 2533 Expr *Index = IndexExprs[IndexIdx]; 2534 if (Index->isTypeDependent() || Index->isValueDependent()) 2535 ExprBits.ValueDependent = true; 2536 2537 // Propagate unexpanded parameter packs. 2538 if (Index->containsUnexpandedParameterPack()) 2539 ExprBits.ContainsUnexpandedParameterPack = true; 2540 2541 // Copy the index expressions into permanent storage. 2542 *Child++ = IndexExprs[IndexIdx++]; 2543 } else if (this->Designators[I].isArrayRangeDesignator()) { 2544 // Compute type- and value-dependence. 2545 Expr *Start = IndexExprs[IndexIdx]; 2546 Expr *End = IndexExprs[IndexIdx + 1]; 2547 if (Start->isTypeDependent() || Start->isValueDependent() || 2548 End->isTypeDependent() || End->isValueDependent()) 2549 ExprBits.ValueDependent = true; 2550 2551 // Propagate unexpanded parameter packs. 2552 if (Start->containsUnexpandedParameterPack() || 2553 End->containsUnexpandedParameterPack()) 2554 ExprBits.ContainsUnexpandedParameterPack = true; 2555 2556 // Copy the start/end expressions into permanent storage. 2557 *Child++ = IndexExprs[IndexIdx++]; 2558 *Child++ = IndexExprs[IndexIdx++]; 2559 } 2560 } 2561 2562 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2563} 2564 2565DesignatedInitExpr * 2566DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2567 unsigned NumDesignators, 2568 Expr **IndexExprs, unsigned NumIndexExprs, 2569 SourceLocation ColonOrEqualLoc, 2570 bool UsesColonSyntax, Expr *Init) { 2571 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2572 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2573 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2574 ColonOrEqualLoc, UsesColonSyntax, 2575 IndexExprs, NumIndexExprs, Init); 2576} 2577 2578DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2579 unsigned NumIndexExprs) { 2580 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2581 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2582 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2583} 2584 2585void DesignatedInitExpr::setDesignators(ASTContext &C, 2586 const Designator *Desigs, 2587 unsigned NumDesigs) { 2588 Designators = new (C) Designator[NumDesigs]; 2589 NumDesignators = NumDesigs; 2590 for (unsigned I = 0; I != NumDesigs; ++I) 2591 Designators[I] = Desigs[I]; 2592} 2593 2594SourceRange DesignatedInitExpr::getSourceRange() const { 2595 SourceLocation StartLoc; 2596 Designator &First = 2597 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2598 if (First.isFieldDesignator()) { 2599 if (GNUSyntax) 2600 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2601 else 2602 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2603 } else 2604 StartLoc = 2605 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2606 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2607} 2608 2609Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2610 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2611 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2612 Ptr += sizeof(DesignatedInitExpr); 2613 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2614 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2615} 2616 2617Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2618 assert(D.Kind == Designator::ArrayRangeDesignator && 2619 "Requires array range designator"); 2620 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2621 Ptr += sizeof(DesignatedInitExpr); 2622 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2623 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2624} 2625 2626Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2627 assert(D.Kind == Designator::ArrayRangeDesignator && 2628 "Requires array range designator"); 2629 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2630 Ptr += sizeof(DesignatedInitExpr); 2631 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2632 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2633} 2634 2635/// \brief Replaces the designator at index @p Idx with the series 2636/// of designators in [First, Last). 2637void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2638 const Designator *First, 2639 const Designator *Last) { 2640 unsigned NumNewDesignators = Last - First; 2641 if (NumNewDesignators == 0) { 2642 std::copy_backward(Designators + Idx + 1, 2643 Designators + NumDesignators, 2644 Designators + Idx); 2645 --NumNewDesignators; 2646 return; 2647 } else if (NumNewDesignators == 1) { 2648 Designators[Idx] = *First; 2649 return; 2650 } 2651 2652 Designator *NewDesignators 2653 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2654 std::copy(Designators, Designators + Idx, NewDesignators); 2655 std::copy(First, Last, NewDesignators + Idx); 2656 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2657 NewDesignators + Idx + NumNewDesignators); 2658 Designators = NewDesignators; 2659 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2660} 2661 2662ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2663 Expr **exprs, unsigned nexprs, 2664 SourceLocation rparenloc) 2665 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2666 false, false, false), 2667 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2668 2669 Exprs = new (C) Stmt*[nexprs]; 2670 for (unsigned i = 0; i != nexprs; ++i) { 2671 if (exprs[i]->isTypeDependent()) 2672 ExprBits.TypeDependent = true; 2673 if (exprs[i]->isValueDependent()) 2674 ExprBits.ValueDependent = true; 2675 if (exprs[i]->containsUnexpandedParameterPack()) 2676 ExprBits.ContainsUnexpandedParameterPack = true; 2677 2678 Exprs[i] = exprs[i]; 2679 } 2680} 2681 2682//===----------------------------------------------------------------------===// 2683// ExprIterator. 2684//===----------------------------------------------------------------------===// 2685 2686Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2687Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2688Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2689const Expr* ConstExprIterator::operator[](size_t idx) const { 2690 return cast<Expr>(I[idx]); 2691} 2692const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2693const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2694 2695//===----------------------------------------------------------------------===// 2696// Child Iterators for iterating over subexpressions/substatements 2697//===----------------------------------------------------------------------===// 2698 2699// DeclRefExpr 2700Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2701Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2702 2703// ObjCIvarRefExpr 2704Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2705Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2706 2707// ObjCPropertyRefExpr 2708Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2709{ 2710 if (Receiver.is<Stmt*>()) { 2711 // Hack alert! 2712 return reinterpret_cast<Stmt**> (&Receiver); 2713 } 2714 return child_iterator(); 2715} 2716 2717Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2718{ return Receiver.is<Stmt*>() ? 2719 reinterpret_cast<Stmt**> (&Receiver)+1 : 2720 child_iterator(); 2721} 2722 2723// ObjCIsaExpr 2724Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2725Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2726 2727// PredefinedExpr 2728Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2729Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2730 2731// IntegerLiteral 2732Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2733Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2734 2735// CharacterLiteral 2736Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2737Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2738 2739// FloatingLiteral 2740Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2741Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2742 2743// ImaginaryLiteral 2744Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2745Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2746 2747// StringLiteral 2748Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2749Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2750 2751// ParenExpr 2752Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2753Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2754 2755// UnaryOperator 2756Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2757Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2758 2759// OffsetOfExpr 2760Stmt::child_iterator OffsetOfExpr::child_begin() { 2761 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2762 + NumComps); 2763} 2764Stmt::child_iterator OffsetOfExpr::child_end() { 2765 return child_iterator(&*child_begin() + NumExprs); 2766} 2767 2768// SizeOfAlignOfExpr 2769Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2770 // If this is of a type and the type is a VLA type (and not a typedef), the 2771 // size expression of the VLA needs to be treated as an executable expression. 2772 // Why isn't this weirdness documented better in StmtIterator? 2773 if (isArgumentType()) { 2774 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2775 getArgumentType().getTypePtr())) 2776 return child_iterator(T); 2777 return child_iterator(); 2778 } 2779 return child_iterator(&Argument.Ex); 2780} 2781Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2782 if (isArgumentType()) 2783 return child_iterator(); 2784 return child_iterator(&Argument.Ex + 1); 2785} 2786 2787// ArraySubscriptExpr 2788Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2789 return &SubExprs[0]; 2790} 2791Stmt::child_iterator ArraySubscriptExpr::child_end() { 2792 return &SubExprs[0]+END_EXPR; 2793} 2794 2795// CallExpr 2796Stmt::child_iterator CallExpr::child_begin() { 2797 return &SubExprs[0]; 2798} 2799Stmt::child_iterator CallExpr::child_end() { 2800 return &SubExprs[0]+NumArgs+ARGS_START; 2801} 2802 2803// MemberExpr 2804Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2805Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2806 2807// ExtVectorElementExpr 2808Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2809Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2810 2811// CompoundLiteralExpr 2812Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2813Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2814 2815// CastExpr 2816Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2817Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2818 2819// BinaryOperator 2820Stmt::child_iterator BinaryOperator::child_begin() { 2821 return &SubExprs[0]; 2822} 2823Stmt::child_iterator BinaryOperator::child_end() { 2824 return &SubExprs[0]+END_EXPR; 2825} 2826 2827// ConditionalOperator 2828Stmt::child_iterator ConditionalOperator::child_begin() { 2829 return &SubExprs[0]; 2830} 2831Stmt::child_iterator ConditionalOperator::child_end() { 2832 return &SubExprs[0]+END_EXPR; 2833} 2834 2835// AddrLabelExpr 2836Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2837Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2838 2839// StmtExpr 2840Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2841Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2842 2843 2844// ChooseExpr 2845Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2846Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2847 2848// GNUNullExpr 2849Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2850Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2851 2852// ShuffleVectorExpr 2853Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2854 return &SubExprs[0]; 2855} 2856Stmt::child_iterator ShuffleVectorExpr::child_end() { 2857 return &SubExprs[0]+NumExprs; 2858} 2859 2860// VAArgExpr 2861Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2862Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2863 2864// InitListExpr 2865Stmt::child_iterator InitListExpr::child_begin() { 2866 return InitExprs.size() ? &InitExprs[0] : 0; 2867} 2868Stmt::child_iterator InitListExpr::child_end() { 2869 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2870} 2871 2872// DesignatedInitExpr 2873Stmt::child_iterator DesignatedInitExpr::child_begin() { 2874 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2875 Ptr += sizeof(DesignatedInitExpr); 2876 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2877} 2878Stmt::child_iterator DesignatedInitExpr::child_end() { 2879 return child_iterator(&*child_begin() + NumSubExprs); 2880} 2881 2882// ImplicitValueInitExpr 2883Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2884 return child_iterator(); 2885} 2886 2887Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2888 return child_iterator(); 2889} 2890 2891// ParenListExpr 2892Stmt::child_iterator ParenListExpr::child_begin() { 2893 return &Exprs[0]; 2894} 2895Stmt::child_iterator ParenListExpr::child_end() { 2896 return &Exprs[0]+NumExprs; 2897} 2898 2899// ObjCStringLiteral 2900Stmt::child_iterator ObjCStringLiteral::child_begin() { 2901 return &String; 2902} 2903Stmt::child_iterator ObjCStringLiteral::child_end() { 2904 return &String+1; 2905} 2906 2907// ObjCEncodeExpr 2908Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2909Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2910 2911// ObjCSelectorExpr 2912Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2913 return child_iterator(); 2914} 2915Stmt::child_iterator ObjCSelectorExpr::child_end() { 2916 return child_iterator(); 2917} 2918 2919// ObjCProtocolExpr 2920Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2921 return child_iterator(); 2922} 2923Stmt::child_iterator ObjCProtocolExpr::child_end() { 2924 return child_iterator(); 2925} 2926 2927// ObjCMessageExpr 2928Stmt::child_iterator ObjCMessageExpr::child_begin() { 2929 if (getReceiverKind() == Instance) 2930 return reinterpret_cast<Stmt **>(this + 1); 2931 return reinterpret_cast<Stmt **>(getArgs()); 2932} 2933Stmt::child_iterator ObjCMessageExpr::child_end() { 2934 return reinterpret_cast<Stmt **>(getArgs() + getNumArgs()); 2935} 2936 2937// Blocks 2938Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2939Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2940 2941Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2942Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2943 2944// OpaqueValueExpr 2945SourceRange OpaqueValueExpr::getSourceRange() const { return SourceRange(); } 2946Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } 2947Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); } 2948 2949