Expr.cpp revision cc324ad80ab940efca006b0064f7ca70a6181816
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} 147 148/// \brief Compute the type- and value-dependence of a declaration reference 149/// based on the declaration being referenced. 150static void computeDeclRefDependence(NamedDecl *D, QualType T, 151 bool &TypeDependent, 152 bool &ValueDependent) { 153 TypeDependent = false; 154 ValueDependent = false; 155 156 157 // (TD) C++ [temp.dep.expr]p3: 158 // An id-expression is type-dependent if it contains: 159 // 160 // and 161 // 162 // (VD) C++ [temp.dep.constexpr]p2: 163 // An identifier is value-dependent if it is: 164 165 // (TD) - an identifier that was declared with dependent type 166 // (VD) - a name declared with a dependent type, 167 if (T->isDependentType()) { 168 TypeDependent = true; 169 ValueDependent = true; 170 return; 171 } 172 173 // (TD) - a conversion-function-id that specifies a dependent type 174 if (D->getDeclName().getNameKind() 175 == DeclarationName::CXXConversionFunctionName && 176 D->getDeclName().getCXXNameType()->isDependentType()) { 177 TypeDependent = true; 178 ValueDependent = true; 179 return; 180 } 181 // (VD) - the name of a non-type template parameter, 182 if (isa<NonTypeTemplateParmDecl>(D)) { 183 ValueDependent = true; 184 return; 185 } 186 187 // (VD) - a constant with integral or enumeration type and is 188 // initialized with an expression that is value-dependent. 189 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 190 if (Var->getType()->isIntegralOrEnumerationType() && 191 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 192 if (const Expr *Init = Var->getAnyInitializer()) 193 if (Init->isValueDependent()) 194 ValueDependent = true; 195 } 196 197 // (VD) - FIXME: Missing from the standard: 198 // - a member function or a static data member of the current 199 // instantiation 200 else if (Var->isStaticDataMember() && 201 Var->getDeclContext()->isDependentContext()) 202 ValueDependent = true; 203 204 return; 205 } 206 207 // (VD) - FIXME: Missing from the standard: 208 // - a member function or a static data member of the current 209 // instantiation 210 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) { 211 ValueDependent = true; 212 return; 213 } 214} 215 216void DeclRefExpr::computeDependence() { 217 bool TypeDependent = false; 218 bool ValueDependent = false; 219 computeDeclRefDependence(getDecl(), getType(), TypeDependent, ValueDependent); 220 221 // (TD) C++ [temp.dep.expr]p3: 222 // An id-expression is type-dependent if it contains: 223 // 224 // and 225 // 226 // (VD) C++ [temp.dep.constexpr]p2: 227 // An identifier is value-dependent if it is: 228 if (!TypeDependent && !ValueDependent && 229 hasExplicitTemplateArgs() && 230 TemplateSpecializationType::anyDependentTemplateArguments( 231 getTemplateArgs(), 232 getNumTemplateArgs())) { 233 TypeDependent = true; 234 ValueDependent = true; 235 } 236 237 ExprBits.TypeDependent = TypeDependent; 238 ExprBits.ValueDependent = ValueDependent; 239 240 // Is the declaration a parameter pack? 241 if (getDecl()->isParameterPack()) 242 ExprBits.ContainsUnexpandedParameterPack = true; 243} 244 245DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 246 SourceRange QualifierRange, 247 ValueDecl *D, SourceLocation NameLoc, 248 const TemplateArgumentListInfo *TemplateArgs, 249 QualType T, ExprValueKind VK) 250 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 251 DecoratedD(D, 252 (Qualifier? HasQualifierFlag : 0) | 253 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 254 Loc(NameLoc) { 255 if (Qualifier) { 256 NameQualifier *NQ = getNameQualifier(); 257 NQ->NNS = Qualifier; 258 NQ->Range = QualifierRange; 259 } 260 261 if (TemplateArgs) 262 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 263 264 computeDependence(); 265} 266 267DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 268 SourceRange QualifierRange, 269 ValueDecl *D, const DeclarationNameInfo &NameInfo, 270 const TemplateArgumentListInfo *TemplateArgs, 271 QualType T, ExprValueKind VK) 272 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 273 DecoratedD(D, 274 (Qualifier? HasQualifierFlag : 0) | 275 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 276 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 277 if (Qualifier) { 278 NameQualifier *NQ = getNameQualifier(); 279 NQ->NNS = Qualifier; 280 NQ->Range = QualifierRange; 281 } 282 283 if (TemplateArgs) 284 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 285 286 computeDependence(); 287} 288 289DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 290 NestedNameSpecifier *Qualifier, 291 SourceRange QualifierRange, 292 ValueDecl *D, 293 SourceLocation NameLoc, 294 QualType T, 295 ExprValueKind VK, 296 const TemplateArgumentListInfo *TemplateArgs) { 297 return Create(Context, Qualifier, QualifierRange, D, 298 DeclarationNameInfo(D->getDeclName(), NameLoc), 299 T, VK, TemplateArgs); 300} 301 302DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 303 NestedNameSpecifier *Qualifier, 304 SourceRange QualifierRange, 305 ValueDecl *D, 306 const DeclarationNameInfo &NameInfo, 307 QualType T, 308 ExprValueKind VK, 309 const TemplateArgumentListInfo *TemplateArgs) { 310 std::size_t Size = sizeof(DeclRefExpr); 311 if (Qualifier != 0) 312 Size += sizeof(NameQualifier); 313 314 if (TemplateArgs) 315 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 316 317 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 318 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 319 TemplateArgs, T, VK); 320} 321 322DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 323 bool HasQualifier, 324 bool HasExplicitTemplateArgs, 325 unsigned NumTemplateArgs) { 326 std::size_t Size = sizeof(DeclRefExpr); 327 if (HasQualifier) 328 Size += sizeof(NameQualifier); 329 330 if (HasExplicitTemplateArgs) 331 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 332 333 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 334 return new (Mem) DeclRefExpr(EmptyShell()); 335} 336 337SourceRange DeclRefExpr::getSourceRange() const { 338 SourceRange R = getNameInfo().getSourceRange(); 339 if (hasQualifier()) 340 R.setBegin(getQualifierRange().getBegin()); 341 if (hasExplicitTemplateArgs()) 342 R.setEnd(getRAngleLoc()); 343 return R; 344} 345 346// FIXME: Maybe this should use DeclPrinter with a special "print predefined 347// expr" policy instead. 348std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 349 ASTContext &Context = CurrentDecl->getASTContext(); 350 351 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 352 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 353 return FD->getNameAsString(); 354 355 llvm::SmallString<256> Name; 356 llvm::raw_svector_ostream Out(Name); 357 358 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 359 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 360 Out << "virtual "; 361 if (MD->isStatic()) 362 Out << "static "; 363 } 364 365 PrintingPolicy Policy(Context.getLangOptions()); 366 367 std::string Proto = FD->getQualifiedNameAsString(Policy); 368 369 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 370 const FunctionProtoType *FT = 0; 371 if (FD->hasWrittenPrototype()) 372 FT = dyn_cast<FunctionProtoType>(AFT); 373 374 Proto += "("; 375 if (FT) { 376 llvm::raw_string_ostream POut(Proto); 377 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 378 if (i) POut << ", "; 379 std::string Param; 380 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 381 POut << Param; 382 } 383 384 if (FT->isVariadic()) { 385 if (FD->getNumParams()) POut << ", "; 386 POut << "..."; 387 } 388 } 389 Proto += ")"; 390 391 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 392 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 393 if (ThisQuals.hasConst()) 394 Proto += " const"; 395 if (ThisQuals.hasVolatile()) 396 Proto += " volatile"; 397 } 398 399 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 400 AFT->getResultType().getAsStringInternal(Proto, Policy); 401 402 Out << Proto; 403 404 Out.flush(); 405 return Name.str().str(); 406 } 407 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 408 llvm::SmallString<256> Name; 409 llvm::raw_svector_ostream Out(Name); 410 Out << (MD->isInstanceMethod() ? '-' : '+'); 411 Out << '['; 412 413 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 414 // a null check to avoid a crash. 415 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 416 Out << ID; 417 418 if (const ObjCCategoryImplDecl *CID = 419 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 420 Out << '(' << CID << ')'; 421 422 Out << ' '; 423 Out << MD->getSelector().getAsString(); 424 Out << ']'; 425 426 Out.flush(); 427 return Name.str().str(); 428 } 429 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 430 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 431 return "top level"; 432 } 433 return ""; 434} 435 436void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 437 if (hasAllocation()) 438 C.Deallocate(pVal); 439 440 BitWidth = Val.getBitWidth(); 441 unsigned NumWords = Val.getNumWords(); 442 const uint64_t* Words = Val.getRawData(); 443 if (NumWords > 1) { 444 pVal = new (C) uint64_t[NumWords]; 445 std::copy(Words, Words + NumWords, pVal); 446 } else if (NumWords == 1) 447 VAL = Words[0]; 448 else 449 VAL = 0; 450} 451 452IntegerLiteral * 453IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 454 QualType type, SourceLocation l) { 455 return new (C) IntegerLiteral(C, V, type, l); 456} 457 458IntegerLiteral * 459IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 460 return new (C) IntegerLiteral(Empty); 461} 462 463FloatingLiteral * 464FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 465 bool isexact, QualType Type, SourceLocation L) { 466 return new (C) FloatingLiteral(C, V, isexact, Type, L); 467} 468 469FloatingLiteral * 470FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 471 return new (C) FloatingLiteral(Empty); 472} 473 474/// getValueAsApproximateDouble - This returns the value as an inaccurate 475/// double. Note that this may cause loss of precision, but is useful for 476/// debugging dumps, etc. 477double FloatingLiteral::getValueAsApproximateDouble() const { 478 llvm::APFloat V = getValue(); 479 bool ignored; 480 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 481 &ignored); 482 return V.convertToDouble(); 483} 484 485StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 486 unsigned ByteLength, bool Wide, 487 QualType Ty, 488 const SourceLocation *Loc, 489 unsigned NumStrs) { 490 // Allocate enough space for the StringLiteral plus an array of locations for 491 // any concatenated string tokens. 492 void *Mem = C.Allocate(sizeof(StringLiteral)+ 493 sizeof(SourceLocation)*(NumStrs-1), 494 llvm::alignOf<StringLiteral>()); 495 StringLiteral *SL = new (Mem) StringLiteral(Ty); 496 497 // OPTIMIZE: could allocate this appended to the StringLiteral. 498 char *AStrData = new (C, 1) char[ByteLength]; 499 memcpy(AStrData, StrData, ByteLength); 500 SL->StrData = AStrData; 501 SL->ByteLength = ByteLength; 502 SL->IsWide = Wide; 503 SL->TokLocs[0] = Loc[0]; 504 SL->NumConcatenated = NumStrs; 505 506 if (NumStrs != 1) 507 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 508 return SL; 509} 510 511StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 512 void *Mem = C.Allocate(sizeof(StringLiteral)+ 513 sizeof(SourceLocation)*(NumStrs-1), 514 llvm::alignOf<StringLiteral>()); 515 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 516 SL->StrData = 0; 517 SL->ByteLength = 0; 518 SL->NumConcatenated = NumStrs; 519 return SL; 520} 521 522void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 523 char *AStrData = new (C, 1) char[Str.size()]; 524 memcpy(AStrData, Str.data(), Str.size()); 525 StrData = AStrData; 526 ByteLength = Str.size(); 527} 528 529/// getLocationOfByte - Return a source location that points to the specified 530/// byte of this string literal. 531/// 532/// Strings are amazingly complex. They can be formed from multiple tokens and 533/// can have escape sequences in them in addition to the usual trigraph and 534/// escaped newline business. This routine handles this complexity. 535/// 536SourceLocation StringLiteral:: 537getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 538 const LangOptions &Features, const TargetInfo &Target) const { 539 assert(!isWide() && "This doesn't work for wide strings yet"); 540 541 // Loop over all of the tokens in this string until we find the one that 542 // contains the byte we're looking for. 543 unsigned TokNo = 0; 544 while (1) { 545 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 546 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 547 548 // Get the spelling of the string so that we can get the data that makes up 549 // the string literal, not the identifier for the macro it is potentially 550 // expanded through. 551 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 552 553 // Re-lex the token to get its length and original spelling. 554 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 555 bool Invalid = false; 556 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 557 if (Invalid) 558 return StrTokSpellingLoc; 559 560 const char *StrData = Buffer.data()+LocInfo.second; 561 562 // Create a langops struct and enable trigraphs. This is sufficient for 563 // relexing tokens. 564 LangOptions LangOpts; 565 LangOpts.Trigraphs = true; 566 567 // Create a lexer starting at the beginning of this token. 568 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 569 Buffer.end()); 570 Token TheTok; 571 TheLexer.LexFromRawLexer(TheTok); 572 573 // Use the StringLiteralParser to compute the length of the string in bytes. 574 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 575 unsigned TokNumBytes = SLP.GetStringLength(); 576 577 // If the byte is in this token, return the location of the byte. 578 if (ByteNo < TokNumBytes || 579 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 580 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 581 582 // Now that we know the offset of the token in the spelling, use the 583 // preprocessor to get the offset in the original source. 584 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 585 } 586 587 // Move to the next string token. 588 ++TokNo; 589 ByteNo -= TokNumBytes; 590 } 591} 592 593 594 595/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 596/// corresponds to, e.g. "sizeof" or "[pre]++". 597const char *UnaryOperator::getOpcodeStr(Opcode Op) { 598 switch (Op) { 599 default: assert(0 && "Unknown unary operator"); 600 case UO_PostInc: return "++"; 601 case UO_PostDec: return "--"; 602 case UO_PreInc: return "++"; 603 case UO_PreDec: return "--"; 604 case UO_AddrOf: return "&"; 605 case UO_Deref: return "*"; 606 case UO_Plus: return "+"; 607 case UO_Minus: return "-"; 608 case UO_Not: return "~"; 609 case UO_LNot: return "!"; 610 case UO_Real: return "__real"; 611 case UO_Imag: return "__imag"; 612 case UO_Extension: return "__extension__"; 613 } 614} 615 616UnaryOperatorKind 617UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 618 switch (OO) { 619 default: assert(false && "No unary operator for overloaded function"); 620 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 621 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 622 case OO_Amp: return UO_AddrOf; 623 case OO_Star: return UO_Deref; 624 case OO_Plus: return UO_Plus; 625 case OO_Minus: return UO_Minus; 626 case OO_Tilde: return UO_Not; 627 case OO_Exclaim: return UO_LNot; 628 } 629} 630 631OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 632 switch (Opc) { 633 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 634 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 635 case UO_AddrOf: return OO_Amp; 636 case UO_Deref: return OO_Star; 637 case UO_Plus: return OO_Plus; 638 case UO_Minus: return OO_Minus; 639 case UO_Not: return OO_Tilde; 640 case UO_LNot: return OO_Exclaim; 641 default: return OO_None; 642 } 643} 644 645 646//===----------------------------------------------------------------------===// 647// Postfix Operators. 648//===----------------------------------------------------------------------===// 649 650CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 651 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 652 SourceLocation rparenloc) 653 : Expr(SC, t, VK, OK_Ordinary, 654 fn->isTypeDependent(), 655 fn->isValueDependent(), 656 fn->containsUnexpandedParameterPack()), 657 NumArgs(numargs) { 658 659 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 660 SubExprs[FN] = fn; 661 for (unsigned i = 0; i != numargs; ++i) { 662 if (args[i]->isTypeDependent()) 663 ExprBits.TypeDependent = true; 664 if (args[i]->isValueDependent()) 665 ExprBits.ValueDependent = true; 666 if (args[i]->containsUnexpandedParameterPack()) 667 ExprBits.ContainsUnexpandedParameterPack = true; 668 669 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 670 } 671 672 CallExprBits.NumPreArgs = NumPreArgs; 673 RParenLoc = rparenloc; 674} 675 676CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 677 QualType t, ExprValueKind VK, SourceLocation rparenloc) 678 : Expr(CallExprClass, t, VK, OK_Ordinary, 679 fn->isTypeDependent(), 680 fn->isValueDependent(), 681 fn->containsUnexpandedParameterPack()), 682 NumArgs(numargs) { 683 684 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 685 SubExprs[FN] = fn; 686 for (unsigned i = 0; i != numargs; ++i) { 687 if (args[i]->isTypeDependent()) 688 ExprBits.TypeDependent = true; 689 if (args[i]->isValueDependent()) 690 ExprBits.ValueDependent = true; 691 if (args[i]->containsUnexpandedParameterPack()) 692 ExprBits.ContainsUnexpandedParameterPack = true; 693 694 SubExprs[i+PREARGS_START] = args[i]; 695 } 696 697 CallExprBits.NumPreArgs = 0; 698 RParenLoc = rparenloc; 699} 700 701CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 702 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 703 // FIXME: Why do we allocate this? 704 SubExprs = new (C) Stmt*[PREARGS_START]; 705 CallExprBits.NumPreArgs = 0; 706} 707 708CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 709 EmptyShell Empty) 710 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 711 // FIXME: Why do we allocate this? 712 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 713 CallExprBits.NumPreArgs = NumPreArgs; 714} 715 716Decl *CallExpr::getCalleeDecl() { 717 Expr *CEE = getCallee()->IgnoreParenCasts(); 718 // If we're calling a dereference, look at the pointer instead. 719 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 720 if (BO->isPtrMemOp()) 721 CEE = BO->getRHS()->IgnoreParenCasts(); 722 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 723 if (UO->getOpcode() == UO_Deref) 724 CEE = UO->getSubExpr()->IgnoreParenCasts(); 725 } 726 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 727 return DRE->getDecl(); 728 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 729 return ME->getMemberDecl(); 730 731 return 0; 732} 733 734FunctionDecl *CallExpr::getDirectCallee() { 735 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 736} 737 738/// setNumArgs - This changes the number of arguments present in this call. 739/// Any orphaned expressions are deleted by this, and any new operands are set 740/// to null. 741void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 742 // No change, just return. 743 if (NumArgs == getNumArgs()) return; 744 745 // If shrinking # arguments, just delete the extras and forgot them. 746 if (NumArgs < getNumArgs()) { 747 this->NumArgs = NumArgs; 748 return; 749 } 750 751 // Otherwise, we are growing the # arguments. New an bigger argument array. 752 unsigned NumPreArgs = getNumPreArgs(); 753 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 754 // Copy over args. 755 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 756 NewSubExprs[i] = SubExprs[i]; 757 // Null out new args. 758 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 759 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 760 NewSubExprs[i] = 0; 761 762 if (SubExprs) C.Deallocate(SubExprs); 763 SubExprs = NewSubExprs; 764 this->NumArgs = NumArgs; 765} 766 767/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 768/// not, return 0. 769unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const { 770 // All simple function calls (e.g. func()) are implicitly cast to pointer to 771 // function. As a result, we try and obtain the DeclRefExpr from the 772 // ImplicitCastExpr. 773 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 774 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 775 return 0; 776 777 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 778 if (!DRE) 779 return 0; 780 781 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 782 if (!FDecl) 783 return 0; 784 785 if (!FDecl->getIdentifier()) 786 return 0; 787 788 return FDecl->getBuiltinID(); 789} 790 791QualType CallExpr::getCallReturnType() const { 792 QualType CalleeType = getCallee()->getType(); 793 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 794 CalleeType = FnTypePtr->getPointeeType(); 795 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 796 CalleeType = BPT->getPointeeType(); 797 else if (const MemberPointerType *MPT 798 = CalleeType->getAs<MemberPointerType>()) 799 CalleeType = MPT->getPointeeType(); 800 801 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 802 return FnType->getResultType(); 803} 804 805OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 806 SourceLocation OperatorLoc, 807 TypeSourceInfo *tsi, 808 OffsetOfNode* compsPtr, unsigned numComps, 809 Expr** exprsPtr, unsigned numExprs, 810 SourceLocation RParenLoc) { 811 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 812 sizeof(OffsetOfNode) * numComps + 813 sizeof(Expr*) * numExprs); 814 815 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 816 exprsPtr, numExprs, RParenLoc); 817} 818 819OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 820 unsigned numComps, unsigned numExprs) { 821 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 822 sizeof(OffsetOfNode) * numComps + 823 sizeof(Expr*) * numExprs); 824 return new (Mem) OffsetOfExpr(numComps, numExprs); 825} 826 827OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 828 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 829 OffsetOfNode* compsPtr, unsigned numComps, 830 Expr** exprsPtr, unsigned numExprs, 831 SourceLocation RParenLoc) 832 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 833 /*TypeDependent=*/false, 834 /*ValueDependent=*/tsi->getType()->isDependentType(), 835 tsi->getType()->containsUnexpandedParameterPack()), 836 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 837 NumComps(numComps), NumExprs(numExprs) 838{ 839 for(unsigned i = 0; i < numComps; ++i) { 840 setComponent(i, compsPtr[i]); 841 } 842 843 for(unsigned i = 0; i < numExprs; ++i) { 844 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 845 ExprBits.ValueDependent = true; 846 if (exprsPtr[i]->containsUnexpandedParameterPack()) 847 ExprBits.ContainsUnexpandedParameterPack = true; 848 849 setIndexExpr(i, exprsPtr[i]); 850 } 851} 852 853IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 854 assert(getKind() == Field || getKind() == Identifier); 855 if (getKind() == Field) 856 return getField()->getIdentifier(); 857 858 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 859} 860 861MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 862 NestedNameSpecifier *qual, 863 SourceRange qualrange, 864 ValueDecl *memberdecl, 865 DeclAccessPair founddecl, 866 DeclarationNameInfo nameinfo, 867 const TemplateArgumentListInfo *targs, 868 QualType ty, 869 ExprValueKind vk, 870 ExprObjectKind ok) { 871 std::size_t Size = sizeof(MemberExpr); 872 873 bool hasQualOrFound = (qual != 0 || 874 founddecl.getDecl() != memberdecl || 875 founddecl.getAccess() != memberdecl->getAccess()); 876 if (hasQualOrFound) 877 Size += sizeof(MemberNameQualifier); 878 879 if (targs) 880 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 881 882 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 883 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 884 ty, vk, ok); 885 886 if (hasQualOrFound) { 887 if (qual && qual->isDependent()) { 888 E->setValueDependent(true); 889 E->setTypeDependent(true); 890 } 891 E->HasQualifierOrFoundDecl = true; 892 893 MemberNameQualifier *NQ = E->getMemberQualifier(); 894 NQ->NNS = qual; 895 NQ->Range = qualrange; 896 NQ->FoundDecl = founddecl; 897 } 898 899 if (targs) { 900 E->HasExplicitTemplateArgumentList = true; 901 E->getExplicitTemplateArgs().initializeFrom(*targs); 902 } 903 904 return E; 905} 906 907const char *CastExpr::getCastKindName() const { 908 switch (getCastKind()) { 909 case CK_Dependent: 910 return "Dependent"; 911 case CK_BitCast: 912 return "BitCast"; 913 case CK_LValueBitCast: 914 return "LValueBitCast"; 915 case CK_LValueToRValue: 916 return "LValueToRValue"; 917 case CK_GetObjCProperty: 918 return "GetObjCProperty"; 919 case CK_NoOp: 920 return "NoOp"; 921 case CK_BaseToDerived: 922 return "BaseToDerived"; 923 case CK_DerivedToBase: 924 return "DerivedToBase"; 925 case CK_UncheckedDerivedToBase: 926 return "UncheckedDerivedToBase"; 927 case CK_Dynamic: 928 return "Dynamic"; 929 case CK_ToUnion: 930 return "ToUnion"; 931 case CK_ArrayToPointerDecay: 932 return "ArrayToPointerDecay"; 933 case CK_FunctionToPointerDecay: 934 return "FunctionToPointerDecay"; 935 case CK_NullToMemberPointer: 936 return "NullToMemberPointer"; 937 case CK_NullToPointer: 938 return "NullToPointer"; 939 case CK_BaseToDerivedMemberPointer: 940 return "BaseToDerivedMemberPointer"; 941 case CK_DerivedToBaseMemberPointer: 942 return "DerivedToBaseMemberPointer"; 943 case CK_UserDefinedConversion: 944 return "UserDefinedConversion"; 945 case CK_ConstructorConversion: 946 return "ConstructorConversion"; 947 case CK_IntegralToPointer: 948 return "IntegralToPointer"; 949 case CK_PointerToIntegral: 950 return "PointerToIntegral"; 951 case CK_PointerToBoolean: 952 return "PointerToBoolean"; 953 case CK_ToVoid: 954 return "ToVoid"; 955 case CK_VectorSplat: 956 return "VectorSplat"; 957 case CK_IntegralCast: 958 return "IntegralCast"; 959 case CK_IntegralToBoolean: 960 return "IntegralToBoolean"; 961 case CK_IntegralToFloating: 962 return "IntegralToFloating"; 963 case CK_FloatingToIntegral: 964 return "FloatingToIntegral"; 965 case CK_FloatingCast: 966 return "FloatingCast"; 967 case CK_FloatingToBoolean: 968 return "FloatingToBoolean"; 969 case CK_MemberPointerToBoolean: 970 return "MemberPointerToBoolean"; 971 case CK_AnyPointerToObjCPointerCast: 972 return "AnyPointerToObjCPointerCast"; 973 case CK_AnyPointerToBlockPointerCast: 974 return "AnyPointerToBlockPointerCast"; 975 case CK_ObjCObjectLValueCast: 976 return "ObjCObjectLValueCast"; 977 case CK_FloatingRealToComplex: 978 return "FloatingRealToComplex"; 979 case CK_FloatingComplexToReal: 980 return "FloatingComplexToReal"; 981 case CK_FloatingComplexToBoolean: 982 return "FloatingComplexToBoolean"; 983 case CK_FloatingComplexCast: 984 return "FloatingComplexCast"; 985 case CK_FloatingComplexToIntegralComplex: 986 return "FloatingComplexToIntegralComplex"; 987 case CK_IntegralRealToComplex: 988 return "IntegralRealToComplex"; 989 case CK_IntegralComplexToReal: 990 return "IntegralComplexToReal"; 991 case CK_IntegralComplexToBoolean: 992 return "IntegralComplexToBoolean"; 993 case CK_IntegralComplexCast: 994 return "IntegralComplexCast"; 995 case CK_IntegralComplexToFloatingComplex: 996 return "IntegralComplexToFloatingComplex"; 997 } 998 999 llvm_unreachable("Unhandled cast kind!"); 1000 return 0; 1001} 1002 1003Expr *CastExpr::getSubExprAsWritten() { 1004 Expr *SubExpr = 0; 1005 CastExpr *E = this; 1006 do { 1007 SubExpr = E->getSubExpr(); 1008 1009 // Skip any temporary bindings; they're implicit. 1010 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1011 SubExpr = Binder->getSubExpr(); 1012 1013 // Conversions by constructor and conversion functions have a 1014 // subexpression describing the call; strip it off. 1015 if (E->getCastKind() == CK_ConstructorConversion) 1016 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1017 else if (E->getCastKind() == CK_UserDefinedConversion) 1018 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1019 1020 // If the subexpression we're left with is an implicit cast, look 1021 // through that, too. 1022 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1023 1024 return SubExpr; 1025} 1026 1027CXXBaseSpecifier **CastExpr::path_buffer() { 1028 switch (getStmtClass()) { 1029#define ABSTRACT_STMT(x) 1030#define CASTEXPR(Type, Base) \ 1031 case Stmt::Type##Class: \ 1032 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1033#define STMT(Type, Base) 1034#include "clang/AST/StmtNodes.inc" 1035 default: 1036 llvm_unreachable("non-cast expressions not possible here"); 1037 return 0; 1038 } 1039} 1040 1041void CastExpr::setCastPath(const CXXCastPath &Path) { 1042 assert(Path.size() == path_size()); 1043 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1044} 1045 1046ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1047 CastKind Kind, Expr *Operand, 1048 const CXXCastPath *BasePath, 1049 ExprValueKind VK) { 1050 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1051 void *Buffer = 1052 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1053 ImplicitCastExpr *E = 1054 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1055 if (PathSize) E->setCastPath(*BasePath); 1056 return E; 1057} 1058 1059ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1060 unsigned PathSize) { 1061 void *Buffer = 1062 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1063 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1064} 1065 1066 1067CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1068 ExprValueKind VK, CastKind K, Expr *Op, 1069 const CXXCastPath *BasePath, 1070 TypeSourceInfo *WrittenTy, 1071 SourceLocation L, SourceLocation R) { 1072 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1073 void *Buffer = 1074 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1075 CStyleCastExpr *E = 1076 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1077 if (PathSize) E->setCastPath(*BasePath); 1078 return E; 1079} 1080 1081CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1082 void *Buffer = 1083 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1084 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1085} 1086 1087/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1088/// corresponds to, e.g. "<<=". 1089const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1090 switch (Op) { 1091 case BO_PtrMemD: return ".*"; 1092 case BO_PtrMemI: return "->*"; 1093 case BO_Mul: return "*"; 1094 case BO_Div: return "/"; 1095 case BO_Rem: return "%"; 1096 case BO_Add: return "+"; 1097 case BO_Sub: return "-"; 1098 case BO_Shl: return "<<"; 1099 case BO_Shr: return ">>"; 1100 case BO_LT: return "<"; 1101 case BO_GT: return ">"; 1102 case BO_LE: return "<="; 1103 case BO_GE: return ">="; 1104 case BO_EQ: return "=="; 1105 case BO_NE: return "!="; 1106 case BO_And: return "&"; 1107 case BO_Xor: return "^"; 1108 case BO_Or: return "|"; 1109 case BO_LAnd: return "&&"; 1110 case BO_LOr: return "||"; 1111 case BO_Assign: return "="; 1112 case BO_MulAssign: return "*="; 1113 case BO_DivAssign: return "/="; 1114 case BO_RemAssign: return "%="; 1115 case BO_AddAssign: return "+="; 1116 case BO_SubAssign: return "-="; 1117 case BO_ShlAssign: return "<<="; 1118 case BO_ShrAssign: return ">>="; 1119 case BO_AndAssign: return "&="; 1120 case BO_XorAssign: return "^="; 1121 case BO_OrAssign: return "|="; 1122 case BO_Comma: return ","; 1123 } 1124 1125 return ""; 1126} 1127 1128BinaryOperatorKind 1129BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1130 switch (OO) { 1131 default: assert(false && "Not an overloadable binary operator"); 1132 case OO_Plus: return BO_Add; 1133 case OO_Minus: return BO_Sub; 1134 case OO_Star: return BO_Mul; 1135 case OO_Slash: return BO_Div; 1136 case OO_Percent: return BO_Rem; 1137 case OO_Caret: return BO_Xor; 1138 case OO_Amp: return BO_And; 1139 case OO_Pipe: return BO_Or; 1140 case OO_Equal: return BO_Assign; 1141 case OO_Less: return BO_LT; 1142 case OO_Greater: return BO_GT; 1143 case OO_PlusEqual: return BO_AddAssign; 1144 case OO_MinusEqual: return BO_SubAssign; 1145 case OO_StarEqual: return BO_MulAssign; 1146 case OO_SlashEqual: return BO_DivAssign; 1147 case OO_PercentEqual: return BO_RemAssign; 1148 case OO_CaretEqual: return BO_XorAssign; 1149 case OO_AmpEqual: return BO_AndAssign; 1150 case OO_PipeEqual: return BO_OrAssign; 1151 case OO_LessLess: return BO_Shl; 1152 case OO_GreaterGreater: return BO_Shr; 1153 case OO_LessLessEqual: return BO_ShlAssign; 1154 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1155 case OO_EqualEqual: return BO_EQ; 1156 case OO_ExclaimEqual: return BO_NE; 1157 case OO_LessEqual: return BO_LE; 1158 case OO_GreaterEqual: return BO_GE; 1159 case OO_AmpAmp: return BO_LAnd; 1160 case OO_PipePipe: return BO_LOr; 1161 case OO_Comma: return BO_Comma; 1162 case OO_ArrowStar: return BO_PtrMemI; 1163 } 1164} 1165 1166OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1167 static const OverloadedOperatorKind OverOps[] = { 1168 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1169 OO_Star, OO_Slash, OO_Percent, 1170 OO_Plus, OO_Minus, 1171 OO_LessLess, OO_GreaterGreater, 1172 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1173 OO_EqualEqual, OO_ExclaimEqual, 1174 OO_Amp, 1175 OO_Caret, 1176 OO_Pipe, 1177 OO_AmpAmp, 1178 OO_PipePipe, 1179 OO_Equal, OO_StarEqual, 1180 OO_SlashEqual, OO_PercentEqual, 1181 OO_PlusEqual, OO_MinusEqual, 1182 OO_LessLessEqual, OO_GreaterGreaterEqual, 1183 OO_AmpEqual, OO_CaretEqual, 1184 OO_PipeEqual, 1185 OO_Comma 1186 }; 1187 return OverOps[Opc]; 1188} 1189 1190InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1191 Expr **initExprs, unsigned numInits, 1192 SourceLocation rbraceloc) 1193 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1194 false), 1195 InitExprs(C, numInits), 1196 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1197 UnionFieldInit(0), HadArrayRangeDesignator(false) 1198{ 1199 for (unsigned I = 0; I != numInits; ++I) { 1200 if (initExprs[I]->isTypeDependent()) 1201 ExprBits.TypeDependent = true; 1202 if (initExprs[I]->isValueDependent()) 1203 ExprBits.ValueDependent = true; 1204 if (initExprs[I]->containsUnexpandedParameterPack()) 1205 ExprBits.ContainsUnexpandedParameterPack = true; 1206 } 1207 1208 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1209} 1210 1211void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1212 if (NumInits > InitExprs.size()) 1213 InitExprs.reserve(C, NumInits); 1214} 1215 1216void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1217 InitExprs.resize(C, NumInits, 0); 1218} 1219 1220Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1221 if (Init >= InitExprs.size()) { 1222 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1223 InitExprs.back() = expr; 1224 return 0; 1225 } 1226 1227 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1228 InitExprs[Init] = expr; 1229 return Result; 1230} 1231 1232SourceRange InitListExpr::getSourceRange() const { 1233 if (SyntacticForm) 1234 return SyntacticForm->getSourceRange(); 1235 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1236 if (Beg.isInvalid()) { 1237 // Find the first non-null initializer. 1238 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1239 E = InitExprs.end(); 1240 I != E; ++I) { 1241 if (Stmt *S = *I) { 1242 Beg = S->getLocStart(); 1243 break; 1244 } 1245 } 1246 } 1247 if (End.isInvalid()) { 1248 // Find the first non-null initializer from the end. 1249 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1250 E = InitExprs.rend(); 1251 I != E; ++I) { 1252 if (Stmt *S = *I) { 1253 End = S->getSourceRange().getEnd(); 1254 break; 1255 } 1256 } 1257 } 1258 return SourceRange(Beg, End); 1259} 1260 1261/// getFunctionType - Return the underlying function type for this block. 1262/// 1263const FunctionType *BlockExpr::getFunctionType() const { 1264 return getType()->getAs<BlockPointerType>()-> 1265 getPointeeType()->getAs<FunctionType>(); 1266} 1267 1268SourceLocation BlockExpr::getCaretLocation() const { 1269 return TheBlock->getCaretLocation(); 1270} 1271const Stmt *BlockExpr::getBody() const { 1272 return TheBlock->getBody(); 1273} 1274Stmt *BlockExpr::getBody() { 1275 return TheBlock->getBody(); 1276} 1277 1278 1279//===----------------------------------------------------------------------===// 1280// Generic Expression Routines 1281//===----------------------------------------------------------------------===// 1282 1283/// isUnusedResultAWarning - Return true if this immediate expression should 1284/// be warned about if the result is unused. If so, fill in Loc and Ranges 1285/// with location to warn on and the source range[s] to report with the 1286/// warning. 1287bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1288 SourceRange &R2, ASTContext &Ctx) const { 1289 // Don't warn if the expr is type dependent. The type could end up 1290 // instantiating to void. 1291 if (isTypeDependent()) 1292 return false; 1293 1294 switch (getStmtClass()) { 1295 default: 1296 if (getType()->isVoidType()) 1297 return false; 1298 Loc = getExprLoc(); 1299 R1 = getSourceRange(); 1300 return true; 1301 case ParenExprClass: 1302 return cast<ParenExpr>(this)->getSubExpr()-> 1303 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1304 case UnaryOperatorClass: { 1305 const UnaryOperator *UO = cast<UnaryOperator>(this); 1306 1307 switch (UO->getOpcode()) { 1308 default: break; 1309 case UO_PostInc: 1310 case UO_PostDec: 1311 case UO_PreInc: 1312 case UO_PreDec: // ++/-- 1313 return false; // Not a warning. 1314 case UO_Deref: 1315 // Dereferencing a volatile pointer is a side-effect. 1316 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1317 return false; 1318 break; 1319 case UO_Real: 1320 case UO_Imag: 1321 // accessing a piece of a volatile complex is a side-effect. 1322 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1323 .isVolatileQualified()) 1324 return false; 1325 break; 1326 case UO_Extension: 1327 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1328 } 1329 Loc = UO->getOperatorLoc(); 1330 R1 = UO->getSubExpr()->getSourceRange(); 1331 return true; 1332 } 1333 case BinaryOperatorClass: { 1334 const BinaryOperator *BO = cast<BinaryOperator>(this); 1335 switch (BO->getOpcode()) { 1336 default: 1337 break; 1338 // Consider the RHS of comma for side effects. LHS was checked by 1339 // Sema::CheckCommaOperands. 1340 case BO_Comma: 1341 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1342 // lvalue-ness) of an assignment written in a macro. 1343 if (IntegerLiteral *IE = 1344 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1345 if (IE->getValue() == 0) 1346 return false; 1347 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1348 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1349 case BO_LAnd: 1350 case BO_LOr: 1351 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1352 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1353 return false; 1354 break; 1355 } 1356 if (BO->isAssignmentOp()) 1357 return false; 1358 Loc = BO->getOperatorLoc(); 1359 R1 = BO->getLHS()->getSourceRange(); 1360 R2 = BO->getRHS()->getSourceRange(); 1361 return true; 1362 } 1363 case CompoundAssignOperatorClass: 1364 case VAArgExprClass: 1365 return false; 1366 1367 case ConditionalOperatorClass: { 1368 // The condition must be evaluated, but if either the LHS or RHS is a 1369 // warning, warn about them. 1370 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1371 if (Exp->getLHS() && 1372 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1373 return true; 1374 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1375 } 1376 1377 case MemberExprClass: 1378 // If the base pointer or element is to a volatile pointer/field, accessing 1379 // it is a side effect. 1380 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1381 return false; 1382 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1383 R1 = SourceRange(Loc, Loc); 1384 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1385 return true; 1386 1387 case ArraySubscriptExprClass: 1388 // If the base pointer or element is to a volatile pointer/field, accessing 1389 // it is a side effect. 1390 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1391 return false; 1392 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1393 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1394 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1395 return true; 1396 1397 case CallExprClass: 1398 case CXXOperatorCallExprClass: 1399 case CXXMemberCallExprClass: { 1400 // If this is a direct call, get the callee. 1401 const CallExpr *CE = cast<CallExpr>(this); 1402 if (const Decl *FD = CE->getCalleeDecl()) { 1403 // If the callee has attribute pure, const, or warn_unused_result, warn 1404 // about it. void foo() { strlen("bar"); } should warn. 1405 // 1406 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1407 // updated to match for QoI. 1408 if (FD->getAttr<WarnUnusedResultAttr>() || 1409 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1410 Loc = CE->getCallee()->getLocStart(); 1411 R1 = CE->getCallee()->getSourceRange(); 1412 1413 if (unsigned NumArgs = CE->getNumArgs()) 1414 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1415 CE->getArg(NumArgs-1)->getLocEnd()); 1416 return true; 1417 } 1418 } 1419 return false; 1420 } 1421 1422 case CXXTemporaryObjectExprClass: 1423 case CXXConstructExprClass: 1424 return false; 1425 1426 case ObjCMessageExprClass: { 1427 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1428 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1429 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1430 Loc = getExprLoc(); 1431 return true; 1432 } 1433 return false; 1434 } 1435 1436 case ObjCPropertyRefExprClass: 1437 Loc = getExprLoc(); 1438 R1 = getSourceRange(); 1439 return true; 1440 1441 case StmtExprClass: { 1442 // Statement exprs don't logically have side effects themselves, but are 1443 // sometimes used in macros in ways that give them a type that is unused. 1444 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1445 // however, if the result of the stmt expr is dead, we don't want to emit a 1446 // warning. 1447 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1448 if (!CS->body_empty()) { 1449 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1450 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1451 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1452 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1453 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1454 } 1455 1456 if (getType()->isVoidType()) 1457 return false; 1458 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1459 R1 = getSourceRange(); 1460 return true; 1461 } 1462 case CStyleCastExprClass: 1463 // If this is an explicit cast to void, allow it. People do this when they 1464 // think they know what they're doing :). 1465 if (getType()->isVoidType()) 1466 return false; 1467 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1468 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1469 return true; 1470 case CXXFunctionalCastExprClass: { 1471 if (getType()->isVoidType()) 1472 return false; 1473 const CastExpr *CE = cast<CastExpr>(this); 1474 1475 // If this is a cast to void or a constructor conversion, check the operand. 1476 // Otherwise, the result of the cast is unused. 1477 if (CE->getCastKind() == CK_ToVoid || 1478 CE->getCastKind() == CK_ConstructorConversion) 1479 return (cast<CastExpr>(this)->getSubExpr() 1480 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1481 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1482 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1483 return true; 1484 } 1485 1486 case ImplicitCastExprClass: 1487 // Check the operand, since implicit casts are inserted by Sema 1488 return (cast<ImplicitCastExpr>(this) 1489 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1490 1491 case CXXDefaultArgExprClass: 1492 return (cast<CXXDefaultArgExpr>(this) 1493 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1494 1495 case CXXNewExprClass: 1496 // FIXME: In theory, there might be new expressions that don't have side 1497 // effects (e.g. a placement new with an uninitialized POD). 1498 case CXXDeleteExprClass: 1499 return false; 1500 case CXXBindTemporaryExprClass: 1501 return (cast<CXXBindTemporaryExpr>(this) 1502 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1503 case ExprWithCleanupsClass: 1504 return (cast<ExprWithCleanups>(this) 1505 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1506 } 1507} 1508 1509/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1510/// returns true, if it is; false otherwise. 1511bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1512 switch (getStmtClass()) { 1513 default: 1514 return false; 1515 case ObjCIvarRefExprClass: 1516 return true; 1517 case Expr::UnaryOperatorClass: 1518 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1519 case ParenExprClass: 1520 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1521 case ImplicitCastExprClass: 1522 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1523 case CStyleCastExprClass: 1524 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1525 case DeclRefExprClass: { 1526 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1527 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1528 if (VD->hasGlobalStorage()) 1529 return true; 1530 QualType T = VD->getType(); 1531 // dereferencing to a pointer is always a gc'able candidate, 1532 // unless it is __weak. 1533 return T->isPointerType() && 1534 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1535 } 1536 return false; 1537 } 1538 case MemberExprClass: { 1539 const MemberExpr *M = cast<MemberExpr>(this); 1540 return M->getBase()->isOBJCGCCandidate(Ctx); 1541 } 1542 case ArraySubscriptExprClass: 1543 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1544 } 1545} 1546 1547bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1548 if (isTypeDependent()) 1549 return false; 1550 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1551} 1552 1553static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1554 Expr::CanThrowResult CT2) { 1555 // CanThrowResult constants are ordered so that the maximum is the correct 1556 // merge result. 1557 return CT1 > CT2 ? CT1 : CT2; 1558} 1559 1560static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1561 Expr *E = const_cast<Expr*>(CE); 1562 Expr::CanThrowResult R = Expr::CT_Cannot; 1563 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1564 I != IE && R != Expr::CT_Can; ++I) { 1565 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1566 } 1567 return R; 1568} 1569 1570static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1571 bool NullThrows = true) { 1572 if (!D) 1573 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1574 1575 // See if we can get a function type from the decl somehow. 1576 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1577 if (!VD) // If we have no clue what we're calling, assume the worst. 1578 return Expr::CT_Can; 1579 1580 // As an extension, we assume that __attribute__((nothrow)) functions don't 1581 // throw. 1582 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1583 return Expr::CT_Cannot; 1584 1585 QualType T = VD->getType(); 1586 const FunctionProtoType *FT; 1587 if ((FT = T->getAs<FunctionProtoType>())) { 1588 } else if (const PointerType *PT = T->getAs<PointerType>()) 1589 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1590 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1591 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1592 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1593 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1594 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1595 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1596 1597 if (!FT) 1598 return Expr::CT_Can; 1599 1600 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1601} 1602 1603static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1604 if (DC->isTypeDependent()) 1605 return Expr::CT_Dependent; 1606 1607 if (!DC->getTypeAsWritten()->isReferenceType()) 1608 return Expr::CT_Cannot; 1609 1610 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1611} 1612 1613static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1614 const CXXTypeidExpr *DC) { 1615 if (DC->isTypeOperand()) 1616 return Expr::CT_Cannot; 1617 1618 Expr *Op = DC->getExprOperand(); 1619 if (Op->isTypeDependent()) 1620 return Expr::CT_Dependent; 1621 1622 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1623 if (!RT) 1624 return Expr::CT_Cannot; 1625 1626 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1627 return Expr::CT_Cannot; 1628 1629 if (Op->Classify(C).isPRValue()) 1630 return Expr::CT_Cannot; 1631 1632 return Expr::CT_Can; 1633} 1634 1635Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1636 // C++ [expr.unary.noexcept]p3: 1637 // [Can throw] if in a potentially-evaluated context the expression would 1638 // contain: 1639 switch (getStmtClass()) { 1640 case CXXThrowExprClass: 1641 // - a potentially evaluated throw-expression 1642 return CT_Can; 1643 1644 case CXXDynamicCastExprClass: { 1645 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1646 // where T is a reference type, that requires a run-time check 1647 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1648 if (CT == CT_Can) 1649 return CT; 1650 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1651 } 1652 1653 case CXXTypeidExprClass: 1654 // - a potentially evaluated typeid expression applied to a glvalue 1655 // expression whose type is a polymorphic class type 1656 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1657 1658 // - a potentially evaluated call to a function, member function, function 1659 // pointer, or member function pointer that does not have a non-throwing 1660 // exception-specification 1661 case CallExprClass: 1662 case CXXOperatorCallExprClass: 1663 case CXXMemberCallExprClass: { 1664 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1665 if (CT == CT_Can) 1666 return CT; 1667 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1668 } 1669 1670 case CXXConstructExprClass: 1671 case CXXTemporaryObjectExprClass: { 1672 CanThrowResult CT = CanCalleeThrow( 1673 cast<CXXConstructExpr>(this)->getConstructor()); 1674 if (CT == CT_Can) 1675 return CT; 1676 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1677 } 1678 1679 case CXXNewExprClass: { 1680 CanThrowResult CT = MergeCanThrow( 1681 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1682 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1683 /*NullThrows*/false)); 1684 if (CT == CT_Can) 1685 return CT; 1686 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1687 } 1688 1689 case CXXDeleteExprClass: { 1690 CanThrowResult CT = CanCalleeThrow( 1691 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1692 if (CT == CT_Can) 1693 return CT; 1694 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1695 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1696 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1697 Arg = Cast->getSubExpr(); 1698 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1699 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1700 CanThrowResult CT2 = CanCalleeThrow( 1701 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1702 if (CT2 == CT_Can) 1703 return CT2; 1704 CT = MergeCanThrow(CT, CT2); 1705 } 1706 } 1707 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1708 } 1709 1710 case CXXBindTemporaryExprClass: { 1711 // The bound temporary has to be destroyed again, which might throw. 1712 CanThrowResult CT = CanCalleeThrow( 1713 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1714 if (CT == CT_Can) 1715 return CT; 1716 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1717 } 1718 1719 // ObjC message sends are like function calls, but never have exception 1720 // specs. 1721 case ObjCMessageExprClass: 1722 case ObjCPropertyRefExprClass: 1723 return CT_Can; 1724 1725 // Many other things have subexpressions, so we have to test those. 1726 // Some are simple: 1727 case ParenExprClass: 1728 case MemberExprClass: 1729 case CXXReinterpretCastExprClass: 1730 case CXXConstCastExprClass: 1731 case ConditionalOperatorClass: 1732 case CompoundLiteralExprClass: 1733 case ExtVectorElementExprClass: 1734 case InitListExprClass: 1735 case DesignatedInitExprClass: 1736 case ParenListExprClass: 1737 case VAArgExprClass: 1738 case CXXDefaultArgExprClass: 1739 case ExprWithCleanupsClass: 1740 case ObjCIvarRefExprClass: 1741 case ObjCIsaExprClass: 1742 case ShuffleVectorExprClass: 1743 return CanSubExprsThrow(C, this); 1744 1745 // Some might be dependent for other reasons. 1746 case UnaryOperatorClass: 1747 case ArraySubscriptExprClass: 1748 case ImplicitCastExprClass: 1749 case CStyleCastExprClass: 1750 case CXXStaticCastExprClass: 1751 case CXXFunctionalCastExprClass: 1752 case BinaryOperatorClass: 1753 case CompoundAssignOperatorClass: { 1754 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1755 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1756 } 1757 1758 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1759 case StmtExprClass: 1760 return CT_Can; 1761 1762 case ChooseExprClass: 1763 if (isTypeDependent() || isValueDependent()) 1764 return CT_Dependent; 1765 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1766 1767 // Some expressions are always dependent. 1768 case DependentScopeDeclRefExprClass: 1769 case CXXUnresolvedConstructExprClass: 1770 case CXXDependentScopeMemberExprClass: 1771 return CT_Dependent; 1772 1773 default: 1774 // All other expressions don't have subexpressions, or else they are 1775 // unevaluated. 1776 return CT_Cannot; 1777 } 1778} 1779 1780Expr* Expr::IgnoreParens() { 1781 Expr* E = this; 1782 while (true) { 1783 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1784 E = P->getSubExpr(); 1785 continue; 1786 } 1787 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1788 if (P->getOpcode() == UO_Extension) { 1789 E = P->getSubExpr(); 1790 continue; 1791 } 1792 } 1793 return E; 1794 } 1795} 1796 1797/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1798/// or CastExprs or ImplicitCastExprs, returning their operand. 1799Expr *Expr::IgnoreParenCasts() { 1800 Expr *E = this; 1801 while (true) { 1802 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1803 E = P->getSubExpr(); 1804 continue; 1805 } 1806 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1807 E = P->getSubExpr(); 1808 continue; 1809 } 1810 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1811 if (P->getOpcode() == UO_Extension) { 1812 E = P->getSubExpr(); 1813 continue; 1814 } 1815 } 1816 return E; 1817 } 1818} 1819 1820/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1821/// casts. This is intended purely as a temporary workaround for code 1822/// that hasn't yet been rewritten to do the right thing about those 1823/// casts, and may disappear along with the last internal use. 1824Expr *Expr::IgnoreParenLValueCasts() { 1825 Expr *E = this; 1826 while (true) { 1827 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1828 E = P->getSubExpr(); 1829 continue; 1830 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1831 if (P->getCastKind() == CK_LValueToRValue) { 1832 E = P->getSubExpr(); 1833 continue; 1834 } 1835 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1836 if (P->getOpcode() == UO_Extension) { 1837 E = P->getSubExpr(); 1838 continue; 1839 } 1840 } 1841 break; 1842 } 1843 return E; 1844} 1845 1846Expr *Expr::IgnoreParenImpCasts() { 1847 Expr *E = this; 1848 while (true) { 1849 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1850 E = P->getSubExpr(); 1851 continue; 1852 } 1853 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1854 E = P->getSubExpr(); 1855 continue; 1856 } 1857 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1858 if (P->getOpcode() == UO_Extension) { 1859 E = P->getSubExpr(); 1860 continue; 1861 } 1862 } 1863 return E; 1864 } 1865} 1866 1867/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1868/// value (including ptr->int casts of the same size). Strip off any 1869/// ParenExpr or CastExprs, returning their operand. 1870Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1871 Expr *E = this; 1872 while (true) { 1873 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1874 E = P->getSubExpr(); 1875 continue; 1876 } 1877 1878 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1879 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1880 // ptr<->int casts of the same width. We also ignore all identity casts. 1881 Expr *SE = P->getSubExpr(); 1882 1883 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1884 E = SE; 1885 continue; 1886 } 1887 1888 if ((E->getType()->isPointerType() || 1889 E->getType()->isIntegralType(Ctx)) && 1890 (SE->getType()->isPointerType() || 1891 SE->getType()->isIntegralType(Ctx)) && 1892 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1893 E = SE; 1894 continue; 1895 } 1896 } 1897 1898 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1899 if (P->getOpcode() == UO_Extension) { 1900 E = P->getSubExpr(); 1901 continue; 1902 } 1903 } 1904 1905 return E; 1906 } 1907} 1908 1909bool Expr::isDefaultArgument() const { 1910 const Expr *E = this; 1911 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1912 E = ICE->getSubExprAsWritten(); 1913 1914 return isa<CXXDefaultArgExpr>(E); 1915} 1916 1917/// \brief Skip over any no-op casts and any temporary-binding 1918/// expressions. 1919static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1920 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1921 if (ICE->getCastKind() == CK_NoOp) 1922 E = ICE->getSubExpr(); 1923 else 1924 break; 1925 } 1926 1927 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1928 E = BE->getSubExpr(); 1929 1930 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1931 if (ICE->getCastKind() == CK_NoOp) 1932 E = ICE->getSubExpr(); 1933 else 1934 break; 1935 } 1936 1937 return E->IgnoreParens(); 1938} 1939 1940/// isTemporaryObject - Determines if this expression produces a 1941/// temporary of the given class type. 1942bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1943 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1944 return false; 1945 1946 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1947 1948 // Temporaries are by definition pr-values of class type. 1949 if (!E->Classify(C).isPRValue()) { 1950 // In this context, property reference is a message call and is pr-value. 1951 if (!isa<ObjCPropertyRefExpr>(E)) 1952 return false; 1953 } 1954 1955 // Black-list a few cases which yield pr-values of class type that don't 1956 // refer to temporaries of that type: 1957 1958 // - implicit derived-to-base conversions 1959 if (isa<ImplicitCastExpr>(E)) { 1960 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1961 case CK_DerivedToBase: 1962 case CK_UncheckedDerivedToBase: 1963 return false; 1964 default: 1965 break; 1966 } 1967 } 1968 1969 // - member expressions (all) 1970 if (isa<MemberExpr>(E)) 1971 return false; 1972 1973 return true; 1974} 1975 1976/// hasAnyTypeDependentArguments - Determines if any of the expressions 1977/// in Exprs is type-dependent. 1978bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1979 for (unsigned I = 0; I < NumExprs; ++I) 1980 if (Exprs[I]->isTypeDependent()) 1981 return true; 1982 1983 return false; 1984} 1985 1986/// hasAnyValueDependentArguments - Determines if any of the expressions 1987/// in Exprs is value-dependent. 1988bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1989 for (unsigned I = 0; I < NumExprs; ++I) 1990 if (Exprs[I]->isValueDependent()) 1991 return true; 1992 1993 return false; 1994} 1995 1996bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1997 // This function is attempting whether an expression is an initializer 1998 // which can be evaluated at compile-time. isEvaluatable handles most 1999 // of the cases, but it can't deal with some initializer-specific 2000 // expressions, and it can't deal with aggregates; we deal with those here, 2001 // and fall back to isEvaluatable for the other cases. 2002 2003 // If we ever capture reference-binding directly in the AST, we can 2004 // kill the second parameter. 2005 2006 if (IsForRef) { 2007 EvalResult Result; 2008 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2009 } 2010 2011 switch (getStmtClass()) { 2012 default: break; 2013 case StringLiteralClass: 2014 case ObjCStringLiteralClass: 2015 case ObjCEncodeExprClass: 2016 return true; 2017 case CXXTemporaryObjectExprClass: 2018 case CXXConstructExprClass: { 2019 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2020 2021 // Only if it's 2022 // 1) an application of the trivial default constructor or 2023 if (!CE->getConstructor()->isTrivial()) return false; 2024 if (!CE->getNumArgs()) return true; 2025 2026 // 2) an elidable trivial copy construction of an operand which is 2027 // itself a constant initializer. Note that we consider the 2028 // operand on its own, *not* as a reference binding. 2029 return CE->isElidable() && 2030 CE->getArg(0)->isConstantInitializer(Ctx, false); 2031 } 2032 case CompoundLiteralExprClass: { 2033 // This handles gcc's extension that allows global initializers like 2034 // "struct x {int x;} x = (struct x) {};". 2035 // FIXME: This accepts other cases it shouldn't! 2036 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2037 return Exp->isConstantInitializer(Ctx, false); 2038 } 2039 case InitListExprClass: { 2040 // FIXME: This doesn't deal with fields with reference types correctly. 2041 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2042 // to bitfields. 2043 const InitListExpr *Exp = cast<InitListExpr>(this); 2044 unsigned numInits = Exp->getNumInits(); 2045 for (unsigned i = 0; i < numInits; i++) { 2046 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2047 return false; 2048 } 2049 return true; 2050 } 2051 case ImplicitValueInitExprClass: 2052 return true; 2053 case ParenExprClass: 2054 return cast<ParenExpr>(this)->getSubExpr() 2055 ->isConstantInitializer(Ctx, IsForRef); 2056 case ChooseExprClass: 2057 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2058 ->isConstantInitializer(Ctx, IsForRef); 2059 case UnaryOperatorClass: { 2060 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2061 if (Exp->getOpcode() == UO_Extension) 2062 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2063 break; 2064 } 2065 case BinaryOperatorClass: { 2066 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2067 // but this handles the common case. 2068 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2069 if (Exp->getOpcode() == BO_Sub && 2070 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2071 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2072 return true; 2073 break; 2074 } 2075 case CXXFunctionalCastExprClass: 2076 case CXXStaticCastExprClass: 2077 case ImplicitCastExprClass: 2078 case CStyleCastExprClass: 2079 // Handle casts with a destination that's a struct or union; this 2080 // deals with both the gcc no-op struct cast extension and the 2081 // cast-to-union extension. 2082 if (getType()->isRecordType()) 2083 return cast<CastExpr>(this)->getSubExpr() 2084 ->isConstantInitializer(Ctx, false); 2085 2086 // Integer->integer casts can be handled here, which is important for 2087 // things like (int)(&&x-&&y). Scary but true. 2088 if (getType()->isIntegerType() && 2089 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2090 return cast<CastExpr>(this)->getSubExpr() 2091 ->isConstantInitializer(Ctx, false); 2092 2093 break; 2094 } 2095 return isEvaluatable(Ctx); 2096} 2097 2098/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2099/// integer constant expression with the value zero, or if this is one that is 2100/// cast to void*. 2101bool Expr::isNullPointerConstant(ASTContext &Ctx, 2102 NullPointerConstantValueDependence NPC) const { 2103 if (isValueDependent()) { 2104 switch (NPC) { 2105 case NPC_NeverValueDependent: 2106 assert(false && "Unexpected value dependent expression!"); 2107 // If the unthinkable happens, fall through to the safest alternative. 2108 2109 case NPC_ValueDependentIsNull: 2110 return isTypeDependent() || getType()->isIntegralType(Ctx); 2111 2112 case NPC_ValueDependentIsNotNull: 2113 return false; 2114 } 2115 } 2116 2117 // Strip off a cast to void*, if it exists. Except in C++. 2118 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2119 if (!Ctx.getLangOptions().CPlusPlus) { 2120 // Check that it is a cast to void*. 2121 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2122 QualType Pointee = PT->getPointeeType(); 2123 if (!Pointee.hasQualifiers() && 2124 Pointee->isVoidType() && // to void* 2125 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2126 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2127 } 2128 } 2129 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2130 // Ignore the ImplicitCastExpr type entirely. 2131 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2132 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2133 // Accept ((void*)0) as a null pointer constant, as many other 2134 // implementations do. 2135 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2136 } else if (const CXXDefaultArgExpr *DefaultArg 2137 = dyn_cast<CXXDefaultArgExpr>(this)) { 2138 // See through default argument expressions 2139 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2140 } else if (isa<GNUNullExpr>(this)) { 2141 // The GNU __null extension is always a null pointer constant. 2142 return true; 2143 } 2144 2145 // C++0x nullptr_t is always a null pointer constant. 2146 if (getType()->isNullPtrType()) 2147 return true; 2148 2149 if (const RecordType *UT = getType()->getAsUnionType()) 2150 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2151 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2152 const Expr *InitExpr = CLE->getInitializer(); 2153 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2154 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2155 } 2156 // This expression must be an integer type. 2157 if (!getType()->isIntegerType() || 2158 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2159 return false; 2160 2161 // If we have an integer constant expression, we need to *evaluate* it and 2162 // test for the value 0. 2163 llvm::APSInt Result; 2164 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2165} 2166 2167/// \brief If this expression is an l-value for an Objective C 2168/// property, find the underlying property reference expression. 2169const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2170 const Expr *E = this; 2171 while (true) { 2172 assert((E->getValueKind() == VK_LValue && 2173 E->getObjectKind() == OK_ObjCProperty) && 2174 "expression is not a property reference"); 2175 E = E->IgnoreParenCasts(); 2176 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2177 if (BO->getOpcode() == BO_Comma) { 2178 E = BO->getRHS(); 2179 continue; 2180 } 2181 } 2182 2183 break; 2184 } 2185 2186 return cast<ObjCPropertyRefExpr>(E); 2187} 2188 2189FieldDecl *Expr::getBitField() { 2190 Expr *E = this->IgnoreParens(); 2191 2192 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2193 if (ICE->getCastKind() == CK_LValueToRValue || 2194 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2195 E = ICE->getSubExpr()->IgnoreParens(); 2196 else 2197 break; 2198 } 2199 2200 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2201 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2202 if (Field->isBitField()) 2203 return Field; 2204 2205 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2206 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2207 if (Field->isBitField()) 2208 return Field; 2209 2210 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2211 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2212 return BinOp->getLHS()->getBitField(); 2213 2214 return 0; 2215} 2216 2217bool Expr::refersToVectorElement() const { 2218 const Expr *E = this->IgnoreParens(); 2219 2220 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2221 if (ICE->getValueKind() != VK_RValue && 2222 ICE->getCastKind() == CK_NoOp) 2223 E = ICE->getSubExpr()->IgnoreParens(); 2224 else 2225 break; 2226 } 2227 2228 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2229 return ASE->getBase()->getType()->isVectorType(); 2230 2231 if (isa<ExtVectorElementExpr>(E)) 2232 return true; 2233 2234 return false; 2235} 2236 2237/// isArrow - Return true if the base expression is a pointer to vector, 2238/// return false if the base expression is a vector. 2239bool ExtVectorElementExpr::isArrow() const { 2240 return getBase()->getType()->isPointerType(); 2241} 2242 2243unsigned ExtVectorElementExpr::getNumElements() const { 2244 if (const VectorType *VT = getType()->getAs<VectorType>()) 2245 return VT->getNumElements(); 2246 return 1; 2247} 2248 2249/// containsDuplicateElements - Return true if any element access is repeated. 2250bool ExtVectorElementExpr::containsDuplicateElements() const { 2251 // FIXME: Refactor this code to an accessor on the AST node which returns the 2252 // "type" of component access, and share with code below and in Sema. 2253 llvm::StringRef Comp = Accessor->getName(); 2254 2255 // Halving swizzles do not contain duplicate elements. 2256 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2257 return false; 2258 2259 // Advance past s-char prefix on hex swizzles. 2260 if (Comp[0] == 's' || Comp[0] == 'S') 2261 Comp = Comp.substr(1); 2262 2263 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2264 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2265 return true; 2266 2267 return false; 2268} 2269 2270/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2271void ExtVectorElementExpr::getEncodedElementAccess( 2272 llvm::SmallVectorImpl<unsigned> &Elts) const { 2273 llvm::StringRef Comp = Accessor->getName(); 2274 if (Comp[0] == 's' || Comp[0] == 'S') 2275 Comp = Comp.substr(1); 2276 2277 bool isHi = Comp == "hi"; 2278 bool isLo = Comp == "lo"; 2279 bool isEven = Comp == "even"; 2280 bool isOdd = Comp == "odd"; 2281 2282 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2283 uint64_t Index; 2284 2285 if (isHi) 2286 Index = e + i; 2287 else if (isLo) 2288 Index = i; 2289 else if (isEven) 2290 Index = 2 * i; 2291 else if (isOdd) 2292 Index = 2 * i + 1; 2293 else 2294 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2295 2296 Elts.push_back(Index); 2297 } 2298} 2299 2300ObjCMessageExpr::ObjCMessageExpr(QualType T, 2301 ExprValueKind VK, 2302 SourceLocation LBracLoc, 2303 SourceLocation SuperLoc, 2304 bool IsInstanceSuper, 2305 QualType SuperType, 2306 Selector Sel, 2307 SourceLocation SelLoc, 2308 ObjCMethodDecl *Method, 2309 Expr **Args, unsigned NumArgs, 2310 SourceLocation RBracLoc) 2311 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2312 /*TypeDependent=*/false, /*ValueDependent=*/false, 2313 /*ContainsUnexpandedParameterPack=*/false), 2314 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2315 HasMethod(Method != 0), SuperLoc(SuperLoc), 2316 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2317 : Sel.getAsOpaquePtr())), 2318 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2319{ 2320 setReceiverPointer(SuperType.getAsOpaquePtr()); 2321 if (NumArgs) 2322 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2323} 2324 2325ObjCMessageExpr::ObjCMessageExpr(QualType T, 2326 ExprValueKind VK, 2327 SourceLocation LBracLoc, 2328 TypeSourceInfo *Receiver, 2329 Selector Sel, 2330 SourceLocation SelLoc, 2331 ObjCMethodDecl *Method, 2332 Expr **Args, unsigned NumArgs, 2333 SourceLocation RBracLoc) 2334 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2335 T->isDependentType(), T->containsUnexpandedParameterPack()), 2336 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2337 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2338 : Sel.getAsOpaquePtr())), 2339 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2340{ 2341 setReceiverPointer(Receiver); 2342 Expr **MyArgs = getArgs(); 2343 for (unsigned I = 0; I != NumArgs; ++I) { 2344 if (Args[I]->isTypeDependent()) 2345 ExprBits.TypeDependent = true; 2346 if (Args[I]->isValueDependent()) 2347 ExprBits.ValueDependent = true; 2348 if (Args[I]->containsUnexpandedParameterPack()) 2349 ExprBits.ContainsUnexpandedParameterPack = true; 2350 2351 MyArgs[I] = Args[I]; 2352 } 2353} 2354 2355ObjCMessageExpr::ObjCMessageExpr(QualType T, 2356 ExprValueKind VK, 2357 SourceLocation LBracLoc, 2358 Expr *Receiver, 2359 Selector Sel, 2360 SourceLocation SelLoc, 2361 ObjCMethodDecl *Method, 2362 Expr **Args, unsigned NumArgs, 2363 SourceLocation RBracLoc) 2364 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2365 Receiver->isTypeDependent(), 2366 Receiver->containsUnexpandedParameterPack()), 2367 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2368 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2369 : Sel.getAsOpaquePtr())), 2370 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2371{ 2372 setReceiverPointer(Receiver); 2373 Expr **MyArgs = getArgs(); 2374 for (unsigned I = 0; I != NumArgs; ++I) { 2375 if (Args[I]->isTypeDependent()) 2376 ExprBits.TypeDependent = true; 2377 if (Args[I]->isValueDependent()) 2378 ExprBits.ValueDependent = true; 2379 if (Args[I]->containsUnexpandedParameterPack()) 2380 ExprBits.ContainsUnexpandedParameterPack = true; 2381 2382 MyArgs[I] = Args[I]; 2383 } 2384} 2385 2386ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2387 ExprValueKind VK, 2388 SourceLocation LBracLoc, 2389 SourceLocation SuperLoc, 2390 bool IsInstanceSuper, 2391 QualType SuperType, 2392 Selector Sel, 2393 SourceLocation SelLoc, 2394 ObjCMethodDecl *Method, 2395 Expr **Args, unsigned NumArgs, 2396 SourceLocation RBracLoc) { 2397 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2398 NumArgs * sizeof(Expr *); 2399 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2400 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2401 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2402 RBracLoc); 2403} 2404 2405ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2406 ExprValueKind VK, 2407 SourceLocation LBracLoc, 2408 TypeSourceInfo *Receiver, 2409 Selector Sel, 2410 SourceLocation SelLoc, 2411 ObjCMethodDecl *Method, 2412 Expr **Args, unsigned NumArgs, 2413 SourceLocation RBracLoc) { 2414 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2415 NumArgs * sizeof(Expr *); 2416 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2417 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2418 Method, Args, NumArgs, RBracLoc); 2419} 2420 2421ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2422 ExprValueKind VK, 2423 SourceLocation LBracLoc, 2424 Expr *Receiver, 2425 Selector Sel, 2426 SourceLocation SelLoc, 2427 ObjCMethodDecl *Method, 2428 Expr **Args, unsigned NumArgs, 2429 SourceLocation RBracLoc) { 2430 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2431 NumArgs * sizeof(Expr *); 2432 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2433 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2434 Method, Args, NumArgs, RBracLoc); 2435} 2436 2437ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2438 unsigned NumArgs) { 2439 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2440 NumArgs * sizeof(Expr *); 2441 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2442 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2443} 2444 2445SourceRange ObjCMessageExpr::getReceiverRange() const { 2446 switch (getReceiverKind()) { 2447 case Instance: 2448 return getInstanceReceiver()->getSourceRange(); 2449 2450 case Class: 2451 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2452 2453 case SuperInstance: 2454 case SuperClass: 2455 return getSuperLoc(); 2456 } 2457 2458 return SourceLocation(); 2459} 2460 2461Selector ObjCMessageExpr::getSelector() const { 2462 if (HasMethod) 2463 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2464 ->getSelector(); 2465 return Selector(SelectorOrMethod); 2466} 2467 2468ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2469 switch (getReceiverKind()) { 2470 case Instance: 2471 if (const ObjCObjectPointerType *Ptr 2472 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2473 return Ptr->getInterfaceDecl(); 2474 break; 2475 2476 case Class: 2477 if (const ObjCObjectType *Ty 2478 = getClassReceiver()->getAs<ObjCObjectType>()) 2479 return Ty->getInterface(); 2480 break; 2481 2482 case SuperInstance: 2483 if (const ObjCObjectPointerType *Ptr 2484 = getSuperType()->getAs<ObjCObjectPointerType>()) 2485 return Ptr->getInterfaceDecl(); 2486 break; 2487 2488 case SuperClass: 2489 if (const ObjCObjectType *Iface 2490 = getSuperType()->getAs<ObjCObjectType>()) 2491 return Iface->getInterface(); 2492 break; 2493 } 2494 2495 return 0; 2496} 2497 2498bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2499 return getCond()->EvaluateAsInt(C) != 0; 2500} 2501 2502ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2503 QualType Type, SourceLocation BLoc, 2504 SourceLocation RP) 2505 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2506 Type->isDependentType(), Type->isDependentType(), 2507 Type->containsUnexpandedParameterPack()), 2508 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2509{ 2510 SubExprs = new (C) Stmt*[nexpr]; 2511 for (unsigned i = 0; i < nexpr; i++) { 2512 if (args[i]->isTypeDependent()) 2513 ExprBits.TypeDependent = true; 2514 if (args[i]->isValueDependent()) 2515 ExprBits.ValueDependent = true; 2516 if (args[i]->containsUnexpandedParameterPack()) 2517 ExprBits.ContainsUnexpandedParameterPack = true; 2518 2519 SubExprs[i] = args[i]; 2520 } 2521} 2522 2523void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2524 unsigned NumExprs) { 2525 if (SubExprs) C.Deallocate(SubExprs); 2526 2527 SubExprs = new (C) Stmt* [NumExprs]; 2528 this->NumExprs = NumExprs; 2529 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2530} 2531 2532//===----------------------------------------------------------------------===// 2533// DesignatedInitExpr 2534//===----------------------------------------------------------------------===// 2535 2536IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2537 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2538 if (Field.NameOrField & 0x01) 2539 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2540 else 2541 return getField()->getIdentifier(); 2542} 2543 2544DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2545 unsigned NumDesignators, 2546 const Designator *Designators, 2547 SourceLocation EqualOrColonLoc, 2548 bool GNUSyntax, 2549 Expr **IndexExprs, 2550 unsigned NumIndexExprs, 2551 Expr *Init) 2552 : Expr(DesignatedInitExprClass, Ty, 2553 Init->getValueKind(), Init->getObjectKind(), 2554 Init->isTypeDependent(), Init->isValueDependent(), 2555 Init->containsUnexpandedParameterPack()), 2556 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2557 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2558 this->Designators = new (C) Designator[NumDesignators]; 2559 2560 // Record the initializer itself. 2561 child_iterator Child = child_begin(); 2562 *Child++ = Init; 2563 2564 // Copy the designators and their subexpressions, computing 2565 // value-dependence along the way. 2566 unsigned IndexIdx = 0; 2567 for (unsigned I = 0; I != NumDesignators; ++I) { 2568 this->Designators[I] = Designators[I]; 2569 2570 if (this->Designators[I].isArrayDesignator()) { 2571 // Compute type- and value-dependence. 2572 Expr *Index = IndexExprs[IndexIdx]; 2573 if (Index->isTypeDependent() || Index->isValueDependent()) 2574 ExprBits.ValueDependent = true; 2575 2576 // Propagate unexpanded parameter packs. 2577 if (Index->containsUnexpandedParameterPack()) 2578 ExprBits.ContainsUnexpandedParameterPack = true; 2579 2580 // Copy the index expressions into permanent storage. 2581 *Child++ = IndexExprs[IndexIdx++]; 2582 } else if (this->Designators[I].isArrayRangeDesignator()) { 2583 // Compute type- and value-dependence. 2584 Expr *Start = IndexExprs[IndexIdx]; 2585 Expr *End = IndexExprs[IndexIdx + 1]; 2586 if (Start->isTypeDependent() || Start->isValueDependent() || 2587 End->isTypeDependent() || End->isValueDependent()) 2588 ExprBits.ValueDependent = true; 2589 2590 // Propagate unexpanded parameter packs. 2591 if (Start->containsUnexpandedParameterPack() || 2592 End->containsUnexpandedParameterPack()) 2593 ExprBits.ContainsUnexpandedParameterPack = true; 2594 2595 // Copy the start/end expressions into permanent storage. 2596 *Child++ = IndexExprs[IndexIdx++]; 2597 *Child++ = IndexExprs[IndexIdx++]; 2598 } 2599 } 2600 2601 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2602} 2603 2604DesignatedInitExpr * 2605DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2606 unsigned NumDesignators, 2607 Expr **IndexExprs, unsigned NumIndexExprs, 2608 SourceLocation ColonOrEqualLoc, 2609 bool UsesColonSyntax, Expr *Init) { 2610 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2611 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2612 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2613 ColonOrEqualLoc, UsesColonSyntax, 2614 IndexExprs, NumIndexExprs, Init); 2615} 2616 2617DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2618 unsigned NumIndexExprs) { 2619 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2620 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2621 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2622} 2623 2624void DesignatedInitExpr::setDesignators(ASTContext &C, 2625 const Designator *Desigs, 2626 unsigned NumDesigs) { 2627 Designators = new (C) Designator[NumDesigs]; 2628 NumDesignators = NumDesigs; 2629 for (unsigned I = 0; I != NumDesigs; ++I) 2630 Designators[I] = Desigs[I]; 2631} 2632 2633SourceRange DesignatedInitExpr::getSourceRange() const { 2634 SourceLocation StartLoc; 2635 Designator &First = 2636 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2637 if (First.isFieldDesignator()) { 2638 if (GNUSyntax) 2639 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2640 else 2641 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2642 } else 2643 StartLoc = 2644 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2645 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2646} 2647 2648Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2649 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2650 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2651 Ptr += sizeof(DesignatedInitExpr); 2652 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2653 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2654} 2655 2656Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2657 assert(D.Kind == Designator::ArrayRangeDesignator && 2658 "Requires array range designator"); 2659 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2660 Ptr += sizeof(DesignatedInitExpr); 2661 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2662 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2663} 2664 2665Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2666 assert(D.Kind == Designator::ArrayRangeDesignator && 2667 "Requires array range designator"); 2668 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2669 Ptr += sizeof(DesignatedInitExpr); 2670 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2671 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2672} 2673 2674/// \brief Replaces the designator at index @p Idx with the series 2675/// of designators in [First, Last). 2676void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2677 const Designator *First, 2678 const Designator *Last) { 2679 unsigned NumNewDesignators = Last - First; 2680 if (NumNewDesignators == 0) { 2681 std::copy_backward(Designators + Idx + 1, 2682 Designators + NumDesignators, 2683 Designators + Idx); 2684 --NumNewDesignators; 2685 return; 2686 } else if (NumNewDesignators == 1) { 2687 Designators[Idx] = *First; 2688 return; 2689 } 2690 2691 Designator *NewDesignators 2692 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2693 std::copy(Designators, Designators + Idx, NewDesignators); 2694 std::copy(First, Last, NewDesignators + Idx); 2695 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2696 NewDesignators + Idx + NumNewDesignators); 2697 Designators = NewDesignators; 2698 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2699} 2700 2701ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2702 Expr **exprs, unsigned nexprs, 2703 SourceLocation rparenloc) 2704 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2705 false, false, false), 2706 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2707 2708 Exprs = new (C) Stmt*[nexprs]; 2709 for (unsigned i = 0; i != nexprs; ++i) { 2710 if (exprs[i]->isTypeDependent()) 2711 ExprBits.TypeDependent = true; 2712 if (exprs[i]->isValueDependent()) 2713 ExprBits.ValueDependent = true; 2714 if (exprs[i]->containsUnexpandedParameterPack()) 2715 ExprBits.ContainsUnexpandedParameterPack = true; 2716 2717 Exprs[i] = exprs[i]; 2718 } 2719} 2720 2721//===----------------------------------------------------------------------===// 2722// ExprIterator. 2723//===----------------------------------------------------------------------===// 2724 2725Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2726Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2727Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2728const Expr* ConstExprIterator::operator[](size_t idx) const { 2729 return cast<Expr>(I[idx]); 2730} 2731const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2732const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2733 2734//===----------------------------------------------------------------------===// 2735// Child Iterators for iterating over subexpressions/substatements 2736//===----------------------------------------------------------------------===// 2737 2738// DeclRefExpr 2739Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2740Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2741 2742// ObjCIvarRefExpr 2743Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2744Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2745 2746// ObjCPropertyRefExpr 2747Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2748{ 2749 if (Receiver.is<Stmt*>()) { 2750 // Hack alert! 2751 return reinterpret_cast<Stmt**> (&Receiver); 2752 } 2753 return child_iterator(); 2754} 2755 2756Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2757{ return Receiver.is<Stmt*>() ? 2758 reinterpret_cast<Stmt**> (&Receiver)+1 : 2759 child_iterator(); 2760} 2761 2762// ObjCIsaExpr 2763Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2764Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2765 2766// PredefinedExpr 2767Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2768Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2769 2770// IntegerLiteral 2771Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2772Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2773 2774// CharacterLiteral 2775Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2776Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2777 2778// FloatingLiteral 2779Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2780Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2781 2782// ImaginaryLiteral 2783Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2784Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2785 2786// StringLiteral 2787Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2788Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2789 2790// ParenExpr 2791Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2792Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2793 2794// UnaryOperator 2795Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2796Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2797 2798// OffsetOfExpr 2799Stmt::child_iterator OffsetOfExpr::child_begin() { 2800 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2801 + NumComps); 2802} 2803Stmt::child_iterator OffsetOfExpr::child_end() { 2804 return child_iterator(&*child_begin() + NumExprs); 2805} 2806 2807// SizeOfAlignOfExpr 2808Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2809 // If this is of a type and the type is a VLA type (and not a typedef), the 2810 // size expression of the VLA needs to be treated as an executable expression. 2811 // Why isn't this weirdness documented better in StmtIterator? 2812 if (isArgumentType()) { 2813 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 2814 getArgumentType().getTypePtr())) 2815 return child_iterator(T); 2816 return child_iterator(); 2817 } 2818 return child_iterator(&Argument.Ex); 2819} 2820Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2821 if (isArgumentType()) 2822 return child_iterator(); 2823 return child_iterator(&Argument.Ex + 1); 2824} 2825 2826// ArraySubscriptExpr 2827Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2828 return &SubExprs[0]; 2829} 2830Stmt::child_iterator ArraySubscriptExpr::child_end() { 2831 return &SubExprs[0]+END_EXPR; 2832} 2833 2834// CallExpr 2835Stmt::child_iterator CallExpr::child_begin() { 2836 return &SubExprs[0]; 2837} 2838Stmt::child_iterator CallExpr::child_end() { 2839 return &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START; 2840} 2841 2842// MemberExpr 2843Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2844Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2845 2846// ExtVectorElementExpr 2847Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2848Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2849 2850// CompoundLiteralExpr 2851Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2852Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2853 2854// CastExpr 2855Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2856Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2857 2858// BinaryOperator 2859Stmt::child_iterator BinaryOperator::child_begin() { 2860 return &SubExprs[0]; 2861} 2862Stmt::child_iterator BinaryOperator::child_end() { 2863 return &SubExprs[0]+END_EXPR; 2864} 2865 2866// ConditionalOperator 2867Stmt::child_iterator ConditionalOperator::child_begin() { 2868 return &SubExprs[0]; 2869} 2870Stmt::child_iterator ConditionalOperator::child_end() { 2871 return &SubExprs[0]+END_EXPR; 2872} 2873 2874// AddrLabelExpr 2875Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2876Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2877 2878// StmtExpr 2879Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2880Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2881 2882 2883// ChooseExpr 2884Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2885Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2886 2887// GNUNullExpr 2888Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2889Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2890 2891// ShuffleVectorExpr 2892Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2893 return &SubExprs[0]; 2894} 2895Stmt::child_iterator ShuffleVectorExpr::child_end() { 2896 return &SubExprs[0]+NumExprs; 2897} 2898 2899// VAArgExpr 2900Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2901Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2902 2903// InitListExpr 2904Stmt::child_iterator InitListExpr::child_begin() { 2905 return InitExprs.size() ? &InitExprs[0] : 0; 2906} 2907Stmt::child_iterator InitListExpr::child_end() { 2908 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2909} 2910 2911// DesignatedInitExpr 2912Stmt::child_iterator DesignatedInitExpr::child_begin() { 2913 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2914 Ptr += sizeof(DesignatedInitExpr); 2915 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2916} 2917Stmt::child_iterator DesignatedInitExpr::child_end() { 2918 return child_iterator(&*child_begin() + NumSubExprs); 2919} 2920 2921// ImplicitValueInitExpr 2922Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2923 return child_iterator(); 2924} 2925 2926Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2927 return child_iterator(); 2928} 2929 2930// ParenListExpr 2931Stmt::child_iterator ParenListExpr::child_begin() { 2932 return &Exprs[0]; 2933} 2934Stmt::child_iterator ParenListExpr::child_end() { 2935 return &Exprs[0]+NumExprs; 2936} 2937 2938// ObjCStringLiteral 2939Stmt::child_iterator ObjCStringLiteral::child_begin() { 2940 return &String; 2941} 2942Stmt::child_iterator ObjCStringLiteral::child_end() { 2943 return &String+1; 2944} 2945 2946// ObjCEncodeExpr 2947Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2948Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2949 2950// ObjCSelectorExpr 2951Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2952 return child_iterator(); 2953} 2954Stmt::child_iterator ObjCSelectorExpr::child_end() { 2955 return child_iterator(); 2956} 2957 2958// ObjCProtocolExpr 2959Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2960 return child_iterator(); 2961} 2962Stmt::child_iterator ObjCProtocolExpr::child_end() { 2963 return child_iterator(); 2964} 2965 2966// ObjCMessageExpr 2967Stmt::child_iterator ObjCMessageExpr::child_begin() { 2968 if (getReceiverKind() == Instance) 2969 return reinterpret_cast<Stmt **>(this + 1); 2970 return reinterpret_cast<Stmt **>(getArgs()); 2971} 2972Stmt::child_iterator ObjCMessageExpr::child_end() { 2973 return reinterpret_cast<Stmt **>(getArgs() + getNumArgs()); 2974} 2975 2976// Blocks 2977BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 2978 SourceLocation l, bool ByRef, 2979 bool constAdded) 2980 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, 2981 d->isParameterPack()), 2982 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 2983{ 2984 bool TypeDependent = false; 2985 bool ValueDependent = false; 2986 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent); 2987 ExprBits.TypeDependent = TypeDependent; 2988 ExprBits.ValueDependent = ValueDependent; 2989} 2990 2991Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2992Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2993 2994Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2995Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2996 2997// OpaqueValueExpr 2998SourceRange OpaqueValueExpr::getSourceRange() const { return Loc; } 2999Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } 3000Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); } 3001 3002