Expr.cpp revision ee8a6cafe8b69c316dd4fa5f6ea4838ffe15621c
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, bool HasQualifier, 323 unsigned NumTemplateArgs) { 324 std::size_t Size = sizeof(DeclRefExpr); 325 if (HasQualifier) 326 Size += sizeof(NameQualifier); 327 328 if (NumTemplateArgs) 329 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 330 331 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 332 return new (Mem) DeclRefExpr(EmptyShell()); 333} 334 335SourceRange DeclRefExpr::getSourceRange() const { 336 SourceRange R = getNameInfo().getSourceRange(); 337 if (hasQualifier()) 338 R.setBegin(getQualifierRange().getBegin()); 339 if (hasExplicitTemplateArgs()) 340 R.setEnd(getRAngleLoc()); 341 return R; 342} 343 344// FIXME: Maybe this should use DeclPrinter with a special "print predefined 345// expr" policy instead. 346std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 347 ASTContext &Context = CurrentDecl->getASTContext(); 348 349 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 350 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 351 return FD->getNameAsString(); 352 353 llvm::SmallString<256> Name; 354 llvm::raw_svector_ostream Out(Name); 355 356 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 357 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 358 Out << "virtual "; 359 if (MD->isStatic()) 360 Out << "static "; 361 } 362 363 PrintingPolicy Policy(Context.getLangOptions()); 364 365 std::string Proto = FD->getQualifiedNameAsString(Policy); 366 367 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 368 const FunctionProtoType *FT = 0; 369 if (FD->hasWrittenPrototype()) 370 FT = dyn_cast<FunctionProtoType>(AFT); 371 372 Proto += "("; 373 if (FT) { 374 llvm::raw_string_ostream POut(Proto); 375 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 376 if (i) POut << ", "; 377 std::string Param; 378 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 379 POut << Param; 380 } 381 382 if (FT->isVariadic()) { 383 if (FD->getNumParams()) POut << ", "; 384 POut << "..."; 385 } 386 } 387 Proto += ")"; 388 389 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 390 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 391 if (ThisQuals.hasConst()) 392 Proto += " const"; 393 if (ThisQuals.hasVolatile()) 394 Proto += " volatile"; 395 } 396 397 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 398 AFT->getResultType().getAsStringInternal(Proto, Policy); 399 400 Out << Proto; 401 402 Out.flush(); 403 return Name.str().str(); 404 } 405 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 406 llvm::SmallString<256> Name; 407 llvm::raw_svector_ostream Out(Name); 408 Out << (MD->isInstanceMethod() ? '-' : '+'); 409 Out << '['; 410 411 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 412 // a null check to avoid a crash. 413 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 414 Out << ID; 415 416 if (const ObjCCategoryImplDecl *CID = 417 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 418 Out << '(' << CID << ')'; 419 420 Out << ' '; 421 Out << MD->getSelector().getAsString(); 422 Out << ']'; 423 424 Out.flush(); 425 return Name.str().str(); 426 } 427 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 428 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 429 return "top level"; 430 } 431 return ""; 432} 433 434void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 435 if (hasAllocation()) 436 C.Deallocate(pVal); 437 438 BitWidth = Val.getBitWidth(); 439 unsigned NumWords = Val.getNumWords(); 440 const uint64_t* Words = Val.getRawData(); 441 if (NumWords > 1) { 442 pVal = new (C) uint64_t[NumWords]; 443 std::copy(Words, Words + NumWords, pVal); 444 } else if (NumWords == 1) 445 VAL = Words[0]; 446 else 447 VAL = 0; 448} 449 450IntegerLiteral * 451IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 452 QualType type, SourceLocation l) { 453 return new (C) IntegerLiteral(C, V, type, l); 454} 455 456IntegerLiteral * 457IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 458 return new (C) IntegerLiteral(Empty); 459} 460 461FloatingLiteral * 462FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 463 bool isexact, QualType Type, SourceLocation L) { 464 return new (C) FloatingLiteral(C, V, isexact, Type, L); 465} 466 467FloatingLiteral * 468FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 469 return new (C) FloatingLiteral(Empty); 470} 471 472/// getValueAsApproximateDouble - This returns the value as an inaccurate 473/// double. Note that this may cause loss of precision, but is useful for 474/// debugging dumps, etc. 475double FloatingLiteral::getValueAsApproximateDouble() const { 476 llvm::APFloat V = getValue(); 477 bool ignored; 478 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 479 &ignored); 480 return V.convertToDouble(); 481} 482 483StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 484 unsigned ByteLength, bool Wide, 485 QualType Ty, 486 const SourceLocation *Loc, 487 unsigned NumStrs) { 488 // Allocate enough space for the StringLiteral plus an array of locations for 489 // any concatenated string tokens. 490 void *Mem = C.Allocate(sizeof(StringLiteral)+ 491 sizeof(SourceLocation)*(NumStrs-1), 492 llvm::alignOf<StringLiteral>()); 493 StringLiteral *SL = new (Mem) StringLiteral(Ty); 494 495 // OPTIMIZE: could allocate this appended to the StringLiteral. 496 char *AStrData = new (C, 1) char[ByteLength]; 497 memcpy(AStrData, StrData, ByteLength); 498 SL->StrData = AStrData; 499 SL->ByteLength = ByteLength; 500 SL->IsWide = Wide; 501 SL->TokLocs[0] = Loc[0]; 502 SL->NumConcatenated = NumStrs; 503 504 if (NumStrs != 1) 505 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 506 return SL; 507} 508 509StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 510 void *Mem = C.Allocate(sizeof(StringLiteral)+ 511 sizeof(SourceLocation)*(NumStrs-1), 512 llvm::alignOf<StringLiteral>()); 513 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 514 SL->StrData = 0; 515 SL->ByteLength = 0; 516 SL->NumConcatenated = NumStrs; 517 return SL; 518} 519 520void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 521 char *AStrData = new (C, 1) char[Str.size()]; 522 memcpy(AStrData, Str.data(), Str.size()); 523 StrData = AStrData; 524 ByteLength = Str.size(); 525} 526 527/// getLocationOfByte - Return a source location that points to the specified 528/// byte of this string literal. 529/// 530/// Strings are amazingly complex. They can be formed from multiple tokens and 531/// can have escape sequences in them in addition to the usual trigraph and 532/// escaped newline business. This routine handles this complexity. 533/// 534SourceLocation StringLiteral:: 535getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 536 const LangOptions &Features, const TargetInfo &Target) const { 537 assert(!isWide() && "This doesn't work for wide strings yet"); 538 539 // Loop over all of the tokens in this string until we find the one that 540 // contains the byte we're looking for. 541 unsigned TokNo = 0; 542 while (1) { 543 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 544 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 545 546 // Get the spelling of the string so that we can get the data that makes up 547 // the string literal, not the identifier for the macro it is potentially 548 // expanded through. 549 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 550 551 // Re-lex the token to get its length and original spelling. 552 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 553 bool Invalid = false; 554 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 555 if (Invalid) 556 return StrTokSpellingLoc; 557 558 const char *StrData = Buffer.data()+LocInfo.second; 559 560 // Create a langops struct and enable trigraphs. This is sufficient for 561 // relexing tokens. 562 LangOptions LangOpts; 563 LangOpts.Trigraphs = true; 564 565 // Create a lexer starting at the beginning of this token. 566 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 567 Buffer.end()); 568 Token TheTok; 569 TheLexer.LexFromRawLexer(TheTok); 570 571 // Use the StringLiteralParser to compute the length of the string in bytes. 572 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 573 unsigned TokNumBytes = SLP.GetStringLength(); 574 575 // If the byte is in this token, return the location of the byte. 576 if (ByteNo < TokNumBytes || 577 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 578 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 579 580 // Now that we know the offset of the token in the spelling, use the 581 // preprocessor to get the offset in the original source. 582 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 583 } 584 585 // Move to the next string token. 586 ++TokNo; 587 ByteNo -= TokNumBytes; 588 } 589} 590 591 592 593/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 594/// corresponds to, e.g. "sizeof" or "[pre]++". 595const char *UnaryOperator::getOpcodeStr(Opcode Op) { 596 switch (Op) { 597 default: assert(0 && "Unknown unary operator"); 598 case UO_PostInc: return "++"; 599 case UO_PostDec: return "--"; 600 case UO_PreInc: return "++"; 601 case UO_PreDec: return "--"; 602 case UO_AddrOf: return "&"; 603 case UO_Deref: return "*"; 604 case UO_Plus: return "+"; 605 case UO_Minus: return "-"; 606 case UO_Not: return "~"; 607 case UO_LNot: return "!"; 608 case UO_Real: return "__real"; 609 case UO_Imag: return "__imag"; 610 case UO_Extension: return "__extension__"; 611 } 612} 613 614UnaryOperatorKind 615UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 616 switch (OO) { 617 default: assert(false && "No unary operator for overloaded function"); 618 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 619 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 620 case OO_Amp: return UO_AddrOf; 621 case OO_Star: return UO_Deref; 622 case OO_Plus: return UO_Plus; 623 case OO_Minus: return UO_Minus; 624 case OO_Tilde: return UO_Not; 625 case OO_Exclaim: return UO_LNot; 626 } 627} 628 629OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 630 switch (Opc) { 631 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 632 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 633 case UO_AddrOf: return OO_Amp; 634 case UO_Deref: return OO_Star; 635 case UO_Plus: return OO_Plus; 636 case UO_Minus: return OO_Minus; 637 case UO_Not: return OO_Tilde; 638 case UO_LNot: return OO_Exclaim; 639 default: return OO_None; 640 } 641} 642 643 644//===----------------------------------------------------------------------===// 645// Postfix Operators. 646//===----------------------------------------------------------------------===// 647 648CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 649 unsigned numargs, QualType t, ExprValueKind VK, 650 SourceLocation rparenloc) 651 : Expr(SC, t, VK, OK_Ordinary, 652 fn->isTypeDependent(), 653 fn->isValueDependent(), 654 fn->containsUnexpandedParameterPack()), 655 NumArgs(numargs) { 656 657 SubExprs = new (C) Stmt*[numargs+1]; 658 SubExprs[FN] = fn; 659 for (unsigned i = 0; i != numargs; ++i) { 660 if (args[i]->isTypeDependent()) 661 ExprBits.TypeDependent = true; 662 if (args[i]->isValueDependent()) 663 ExprBits.ValueDependent = true; 664 if (args[i]->containsUnexpandedParameterPack()) 665 ExprBits.ContainsUnexpandedParameterPack = true; 666 667 SubExprs[i+ARGS_START] = args[i]; 668 } 669 670 RParenLoc = rparenloc; 671} 672 673CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 674 QualType t, ExprValueKind VK, SourceLocation rparenloc) 675 : Expr(CallExprClass, t, VK, OK_Ordinary, 676 fn->isTypeDependent(), 677 fn->isValueDependent(), 678 fn->containsUnexpandedParameterPack()), 679 NumArgs(numargs) { 680 681 SubExprs = new (C) Stmt*[numargs+1]; 682 SubExprs[FN] = fn; 683 for (unsigned i = 0; i != numargs; ++i) { 684 if (args[i]->isTypeDependent()) 685 ExprBits.TypeDependent = true; 686 if (args[i]->isValueDependent()) 687 ExprBits.ValueDependent = true; 688 if (args[i]->containsUnexpandedParameterPack()) 689 ExprBits.ContainsUnexpandedParameterPack = true; 690 691 SubExprs[i+ARGS_START] = args[i]; 692 } 693 694 RParenLoc = rparenloc; 695} 696 697CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 698 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 699 // FIXME: Why do we allocate this? 700 SubExprs = new (C) Stmt*[1]; 701} 702 703Decl *CallExpr::getCalleeDecl() { 704 Expr *CEE = getCallee()->IgnoreParenCasts(); 705 // If we're calling a dereference, look at the pointer instead. 706 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 707 if (BO->isPtrMemOp()) 708 CEE = BO->getRHS()->IgnoreParenCasts(); 709 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 710 if (UO->getOpcode() == UO_Deref) 711 CEE = UO->getSubExpr()->IgnoreParenCasts(); 712 } 713 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 714 return DRE->getDecl(); 715 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 716 return ME->getMemberDecl(); 717 718 return 0; 719} 720 721FunctionDecl *CallExpr::getDirectCallee() { 722 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 723} 724 725/// setNumArgs - This changes the number of arguments present in this call. 726/// Any orphaned expressions are deleted by this, and any new operands are set 727/// to null. 728void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 729 // No change, just return. 730 if (NumArgs == getNumArgs()) return; 731 732 // If shrinking # arguments, just delete the extras and forgot them. 733 if (NumArgs < getNumArgs()) { 734 this->NumArgs = NumArgs; 735 return; 736 } 737 738 // Otherwise, we are growing the # arguments. New an bigger argument array. 739 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 740 // Copy over args. 741 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 742 NewSubExprs[i] = SubExprs[i]; 743 // Null out new args. 744 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 745 NewSubExprs[i] = 0; 746 747 if (SubExprs) C.Deallocate(SubExprs); 748 SubExprs = NewSubExprs; 749 this->NumArgs = NumArgs; 750} 751 752/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 753/// not, return 0. 754unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const { 755 // All simple function calls (e.g. func()) are implicitly cast to pointer to 756 // function. As a result, we try and obtain the DeclRefExpr from the 757 // ImplicitCastExpr. 758 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 759 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 760 return 0; 761 762 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 763 if (!DRE) 764 return 0; 765 766 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 767 if (!FDecl) 768 return 0; 769 770 if (!FDecl->getIdentifier()) 771 return 0; 772 773 return FDecl->getBuiltinID(); 774} 775 776QualType CallExpr::getCallReturnType() const { 777 QualType CalleeType = getCallee()->getType(); 778 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 779 CalleeType = FnTypePtr->getPointeeType(); 780 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 781 CalleeType = BPT->getPointeeType(); 782 else if (const MemberPointerType *MPT 783 = CalleeType->getAs<MemberPointerType>()) 784 CalleeType = MPT->getPointeeType(); 785 786 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 787 return FnType->getResultType(); 788} 789 790OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 791 SourceLocation OperatorLoc, 792 TypeSourceInfo *tsi, 793 OffsetOfNode* compsPtr, unsigned numComps, 794 Expr** exprsPtr, unsigned numExprs, 795 SourceLocation RParenLoc) { 796 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 797 sizeof(OffsetOfNode) * numComps + 798 sizeof(Expr*) * numExprs); 799 800 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 801 exprsPtr, numExprs, RParenLoc); 802} 803 804OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 805 unsigned numComps, unsigned numExprs) { 806 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 807 sizeof(OffsetOfNode) * numComps + 808 sizeof(Expr*) * numExprs); 809 return new (Mem) OffsetOfExpr(numComps, numExprs); 810} 811 812OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 813 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 814 OffsetOfNode* compsPtr, unsigned numComps, 815 Expr** exprsPtr, unsigned numExprs, 816 SourceLocation RParenLoc) 817 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 818 /*TypeDependent=*/false, 819 /*ValueDependent=*/tsi->getType()->isDependentType(), 820 tsi->getType()->containsUnexpandedParameterPack()), 821 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 822 NumComps(numComps), NumExprs(numExprs) 823{ 824 for(unsigned i = 0; i < numComps; ++i) { 825 setComponent(i, compsPtr[i]); 826 } 827 828 for(unsigned i = 0; i < numExprs; ++i) { 829 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 830 ExprBits.ValueDependent = true; 831 if (exprsPtr[i]->containsUnexpandedParameterPack()) 832 ExprBits.ContainsUnexpandedParameterPack = true; 833 834 setIndexExpr(i, exprsPtr[i]); 835 } 836} 837 838IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 839 assert(getKind() == Field || getKind() == Identifier); 840 if (getKind() == Field) 841 return getField()->getIdentifier(); 842 843 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 844} 845 846MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 847 NestedNameSpecifier *qual, 848 SourceRange qualrange, 849 ValueDecl *memberdecl, 850 DeclAccessPair founddecl, 851 DeclarationNameInfo nameinfo, 852 const TemplateArgumentListInfo *targs, 853 QualType ty, 854 ExprValueKind vk, 855 ExprObjectKind ok) { 856 std::size_t Size = sizeof(MemberExpr); 857 858 bool hasQualOrFound = (qual != 0 || 859 founddecl.getDecl() != memberdecl || 860 founddecl.getAccess() != memberdecl->getAccess()); 861 if (hasQualOrFound) 862 Size += sizeof(MemberNameQualifier); 863 864 if (targs) 865 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 866 867 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 868 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 869 ty, vk, ok); 870 871 if (hasQualOrFound) { 872 if (qual && qual->isDependent()) { 873 E->setValueDependent(true); 874 E->setTypeDependent(true); 875 } 876 E->HasQualifierOrFoundDecl = true; 877 878 MemberNameQualifier *NQ = E->getMemberQualifier(); 879 NQ->NNS = qual; 880 NQ->Range = qualrange; 881 NQ->FoundDecl = founddecl; 882 } 883 884 if (targs) { 885 E->HasExplicitTemplateArgumentList = true; 886 E->getExplicitTemplateArgs().initializeFrom(*targs); 887 } 888 889 return E; 890} 891 892const char *CastExpr::getCastKindName() const { 893 switch (getCastKind()) { 894 case CK_Dependent: 895 return "Dependent"; 896 case CK_BitCast: 897 return "BitCast"; 898 case CK_LValueBitCast: 899 return "LValueBitCast"; 900 case CK_LValueToRValue: 901 return "LValueToRValue"; 902 case CK_GetObjCProperty: 903 return "GetObjCProperty"; 904 case CK_NoOp: 905 return "NoOp"; 906 case CK_BaseToDerived: 907 return "BaseToDerived"; 908 case CK_DerivedToBase: 909 return "DerivedToBase"; 910 case CK_UncheckedDerivedToBase: 911 return "UncheckedDerivedToBase"; 912 case CK_Dynamic: 913 return "Dynamic"; 914 case CK_ToUnion: 915 return "ToUnion"; 916 case CK_ArrayToPointerDecay: 917 return "ArrayToPointerDecay"; 918 case CK_FunctionToPointerDecay: 919 return "FunctionToPointerDecay"; 920 case CK_NullToMemberPointer: 921 return "NullToMemberPointer"; 922 case CK_NullToPointer: 923 return "NullToPointer"; 924 case CK_BaseToDerivedMemberPointer: 925 return "BaseToDerivedMemberPointer"; 926 case CK_DerivedToBaseMemberPointer: 927 return "DerivedToBaseMemberPointer"; 928 case CK_UserDefinedConversion: 929 return "UserDefinedConversion"; 930 case CK_ConstructorConversion: 931 return "ConstructorConversion"; 932 case CK_IntegralToPointer: 933 return "IntegralToPointer"; 934 case CK_PointerToIntegral: 935 return "PointerToIntegral"; 936 case CK_PointerToBoolean: 937 return "PointerToBoolean"; 938 case CK_ToVoid: 939 return "ToVoid"; 940 case CK_VectorSplat: 941 return "VectorSplat"; 942 case CK_IntegralCast: 943 return "IntegralCast"; 944 case CK_IntegralToBoolean: 945 return "IntegralToBoolean"; 946 case CK_IntegralToFloating: 947 return "IntegralToFloating"; 948 case CK_FloatingToIntegral: 949 return "FloatingToIntegral"; 950 case CK_FloatingCast: 951 return "FloatingCast"; 952 case CK_FloatingToBoolean: 953 return "FloatingToBoolean"; 954 case CK_MemberPointerToBoolean: 955 return "MemberPointerToBoolean"; 956 case CK_AnyPointerToObjCPointerCast: 957 return "AnyPointerToObjCPointerCast"; 958 case CK_AnyPointerToBlockPointerCast: 959 return "AnyPointerToBlockPointerCast"; 960 case CK_ObjCObjectLValueCast: 961 return "ObjCObjectLValueCast"; 962 case CK_FloatingRealToComplex: 963 return "FloatingRealToComplex"; 964 case CK_FloatingComplexToReal: 965 return "FloatingComplexToReal"; 966 case CK_FloatingComplexToBoolean: 967 return "FloatingComplexToBoolean"; 968 case CK_FloatingComplexCast: 969 return "FloatingComplexCast"; 970 case CK_FloatingComplexToIntegralComplex: 971 return "FloatingComplexToIntegralComplex"; 972 case CK_IntegralRealToComplex: 973 return "IntegralRealToComplex"; 974 case CK_IntegralComplexToReal: 975 return "IntegralComplexToReal"; 976 case CK_IntegralComplexToBoolean: 977 return "IntegralComplexToBoolean"; 978 case CK_IntegralComplexCast: 979 return "IntegralComplexCast"; 980 case CK_IntegralComplexToFloatingComplex: 981 return "IntegralComplexToFloatingComplex"; 982 } 983 984 llvm_unreachable("Unhandled cast kind!"); 985 return 0; 986} 987 988Expr *CastExpr::getSubExprAsWritten() { 989 Expr *SubExpr = 0; 990 CastExpr *E = this; 991 do { 992 SubExpr = E->getSubExpr(); 993 994 // Skip any temporary bindings; they're implicit. 995 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 996 SubExpr = Binder->getSubExpr(); 997 998 // Conversions by constructor and conversion functions have a 999 // subexpression describing the call; strip it off. 1000 if (E->getCastKind() == CK_ConstructorConversion) 1001 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1002 else if (E->getCastKind() == CK_UserDefinedConversion) 1003 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1004 1005 // If the subexpression we're left with is an implicit cast, look 1006 // through that, too. 1007 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1008 1009 return SubExpr; 1010} 1011 1012CXXBaseSpecifier **CastExpr::path_buffer() { 1013 switch (getStmtClass()) { 1014#define ABSTRACT_STMT(x) 1015#define CASTEXPR(Type, Base) \ 1016 case Stmt::Type##Class: \ 1017 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1018#define STMT(Type, Base) 1019#include "clang/AST/StmtNodes.inc" 1020 default: 1021 llvm_unreachable("non-cast expressions not possible here"); 1022 return 0; 1023 } 1024} 1025 1026void CastExpr::setCastPath(const CXXCastPath &Path) { 1027 assert(Path.size() == path_size()); 1028 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1029} 1030 1031ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1032 CastKind Kind, Expr *Operand, 1033 const CXXCastPath *BasePath, 1034 ExprValueKind VK) { 1035 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1036 void *Buffer = 1037 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1038 ImplicitCastExpr *E = 1039 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1040 if (PathSize) E->setCastPath(*BasePath); 1041 return E; 1042} 1043 1044ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1045 unsigned PathSize) { 1046 void *Buffer = 1047 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1048 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1049} 1050 1051 1052CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1053 ExprValueKind VK, CastKind K, Expr *Op, 1054 const CXXCastPath *BasePath, 1055 TypeSourceInfo *WrittenTy, 1056 SourceLocation L, SourceLocation R) { 1057 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1058 void *Buffer = 1059 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1060 CStyleCastExpr *E = 1061 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1062 if (PathSize) E->setCastPath(*BasePath); 1063 return E; 1064} 1065 1066CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1067 void *Buffer = 1068 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1069 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1070} 1071 1072/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1073/// corresponds to, e.g. "<<=". 1074const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1075 switch (Op) { 1076 case BO_PtrMemD: return ".*"; 1077 case BO_PtrMemI: return "->*"; 1078 case BO_Mul: return "*"; 1079 case BO_Div: return "/"; 1080 case BO_Rem: return "%"; 1081 case BO_Add: return "+"; 1082 case BO_Sub: return "-"; 1083 case BO_Shl: return "<<"; 1084 case BO_Shr: return ">>"; 1085 case BO_LT: return "<"; 1086 case BO_GT: return ">"; 1087 case BO_LE: return "<="; 1088 case BO_GE: return ">="; 1089 case BO_EQ: return "=="; 1090 case BO_NE: return "!="; 1091 case BO_And: return "&"; 1092 case BO_Xor: return "^"; 1093 case BO_Or: return "|"; 1094 case BO_LAnd: return "&&"; 1095 case BO_LOr: return "||"; 1096 case BO_Assign: return "="; 1097 case BO_MulAssign: return "*="; 1098 case BO_DivAssign: return "/="; 1099 case BO_RemAssign: return "%="; 1100 case BO_AddAssign: return "+="; 1101 case BO_SubAssign: return "-="; 1102 case BO_ShlAssign: return "<<="; 1103 case BO_ShrAssign: return ">>="; 1104 case BO_AndAssign: return "&="; 1105 case BO_XorAssign: return "^="; 1106 case BO_OrAssign: return "|="; 1107 case BO_Comma: return ","; 1108 } 1109 1110 return ""; 1111} 1112 1113BinaryOperatorKind 1114BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1115 switch (OO) { 1116 default: assert(false && "Not an overloadable binary operator"); 1117 case OO_Plus: return BO_Add; 1118 case OO_Minus: return BO_Sub; 1119 case OO_Star: return BO_Mul; 1120 case OO_Slash: return BO_Div; 1121 case OO_Percent: return BO_Rem; 1122 case OO_Caret: return BO_Xor; 1123 case OO_Amp: return BO_And; 1124 case OO_Pipe: return BO_Or; 1125 case OO_Equal: return BO_Assign; 1126 case OO_Less: return BO_LT; 1127 case OO_Greater: return BO_GT; 1128 case OO_PlusEqual: return BO_AddAssign; 1129 case OO_MinusEqual: return BO_SubAssign; 1130 case OO_StarEqual: return BO_MulAssign; 1131 case OO_SlashEqual: return BO_DivAssign; 1132 case OO_PercentEqual: return BO_RemAssign; 1133 case OO_CaretEqual: return BO_XorAssign; 1134 case OO_AmpEqual: return BO_AndAssign; 1135 case OO_PipeEqual: return BO_OrAssign; 1136 case OO_LessLess: return BO_Shl; 1137 case OO_GreaterGreater: return BO_Shr; 1138 case OO_LessLessEqual: return BO_ShlAssign; 1139 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1140 case OO_EqualEqual: return BO_EQ; 1141 case OO_ExclaimEqual: return BO_NE; 1142 case OO_LessEqual: return BO_LE; 1143 case OO_GreaterEqual: return BO_GE; 1144 case OO_AmpAmp: return BO_LAnd; 1145 case OO_PipePipe: return BO_LOr; 1146 case OO_Comma: return BO_Comma; 1147 case OO_ArrowStar: return BO_PtrMemI; 1148 } 1149} 1150 1151OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1152 static const OverloadedOperatorKind OverOps[] = { 1153 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1154 OO_Star, OO_Slash, OO_Percent, 1155 OO_Plus, OO_Minus, 1156 OO_LessLess, OO_GreaterGreater, 1157 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1158 OO_EqualEqual, OO_ExclaimEqual, 1159 OO_Amp, 1160 OO_Caret, 1161 OO_Pipe, 1162 OO_AmpAmp, 1163 OO_PipePipe, 1164 OO_Equal, OO_StarEqual, 1165 OO_SlashEqual, OO_PercentEqual, 1166 OO_PlusEqual, OO_MinusEqual, 1167 OO_LessLessEqual, OO_GreaterGreaterEqual, 1168 OO_AmpEqual, OO_CaretEqual, 1169 OO_PipeEqual, 1170 OO_Comma 1171 }; 1172 return OverOps[Opc]; 1173} 1174 1175InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1176 Expr **initExprs, unsigned numInits, 1177 SourceLocation rbraceloc) 1178 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1179 false), 1180 InitExprs(C, numInits), 1181 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1182 UnionFieldInit(0), HadArrayRangeDesignator(false) 1183{ 1184 for (unsigned I = 0; I != numInits; ++I) { 1185 if (initExprs[I]->isTypeDependent()) 1186 ExprBits.TypeDependent = true; 1187 if (initExprs[I]->isValueDependent()) 1188 ExprBits.ValueDependent = true; 1189 if (initExprs[I]->containsUnexpandedParameterPack()) 1190 ExprBits.ContainsUnexpandedParameterPack = true; 1191 } 1192 1193 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1194} 1195 1196void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1197 if (NumInits > InitExprs.size()) 1198 InitExprs.reserve(C, NumInits); 1199} 1200 1201void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1202 InitExprs.resize(C, NumInits, 0); 1203} 1204 1205Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1206 if (Init >= InitExprs.size()) { 1207 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1208 InitExprs.back() = expr; 1209 return 0; 1210 } 1211 1212 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1213 InitExprs[Init] = expr; 1214 return Result; 1215} 1216 1217SourceRange InitListExpr::getSourceRange() const { 1218 if (SyntacticForm) 1219 return SyntacticForm->getSourceRange(); 1220 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1221 if (Beg.isInvalid()) { 1222 // Find the first non-null initializer. 1223 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1224 E = InitExprs.end(); 1225 I != E; ++I) { 1226 if (Stmt *S = *I) { 1227 Beg = S->getLocStart(); 1228 break; 1229 } 1230 } 1231 } 1232 if (End.isInvalid()) { 1233 // Find the first non-null initializer from the end. 1234 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1235 E = InitExprs.rend(); 1236 I != E; ++I) { 1237 if (Stmt *S = *I) { 1238 End = S->getSourceRange().getEnd(); 1239 break; 1240 } 1241 } 1242 } 1243 return SourceRange(Beg, End); 1244} 1245 1246/// getFunctionType - Return the underlying function type for this block. 1247/// 1248const FunctionType *BlockExpr::getFunctionType() const { 1249 return getType()->getAs<BlockPointerType>()-> 1250 getPointeeType()->getAs<FunctionType>(); 1251} 1252 1253SourceLocation BlockExpr::getCaretLocation() const { 1254 return TheBlock->getCaretLocation(); 1255} 1256const Stmt *BlockExpr::getBody() const { 1257 return TheBlock->getBody(); 1258} 1259Stmt *BlockExpr::getBody() { 1260 return TheBlock->getBody(); 1261} 1262 1263 1264//===----------------------------------------------------------------------===// 1265// Generic Expression Routines 1266//===----------------------------------------------------------------------===// 1267 1268/// isUnusedResultAWarning - Return true if this immediate expression should 1269/// be warned about if the result is unused. If so, fill in Loc and Ranges 1270/// with location to warn on and the source range[s] to report with the 1271/// warning. 1272bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1273 SourceRange &R2, ASTContext &Ctx) const { 1274 // Don't warn if the expr is type dependent. The type could end up 1275 // instantiating to void. 1276 if (isTypeDependent()) 1277 return false; 1278 1279 switch (getStmtClass()) { 1280 default: 1281 if (getType()->isVoidType()) 1282 return false; 1283 Loc = getExprLoc(); 1284 R1 = getSourceRange(); 1285 return true; 1286 case ParenExprClass: 1287 return cast<ParenExpr>(this)->getSubExpr()-> 1288 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1289 case UnaryOperatorClass: { 1290 const UnaryOperator *UO = cast<UnaryOperator>(this); 1291 1292 switch (UO->getOpcode()) { 1293 default: break; 1294 case UO_PostInc: 1295 case UO_PostDec: 1296 case UO_PreInc: 1297 case UO_PreDec: // ++/-- 1298 return false; // Not a warning. 1299 case UO_Deref: 1300 // Dereferencing a volatile pointer is a side-effect. 1301 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1302 return false; 1303 break; 1304 case UO_Real: 1305 case UO_Imag: 1306 // accessing a piece of a volatile complex is a side-effect. 1307 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1308 .isVolatileQualified()) 1309 return false; 1310 break; 1311 case UO_Extension: 1312 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1313 } 1314 Loc = UO->getOperatorLoc(); 1315 R1 = UO->getSubExpr()->getSourceRange(); 1316 return true; 1317 } 1318 case BinaryOperatorClass: { 1319 const BinaryOperator *BO = cast<BinaryOperator>(this); 1320 switch (BO->getOpcode()) { 1321 default: 1322 break; 1323 // Consider the RHS of comma for side effects. LHS was checked by 1324 // Sema::CheckCommaOperands. 1325 case BO_Comma: 1326 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1327 // lvalue-ness) of an assignment written in a macro. 1328 if (IntegerLiteral *IE = 1329 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1330 if (IE->getValue() == 0) 1331 return false; 1332 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1333 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1334 case BO_LAnd: 1335 case BO_LOr: 1336 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1337 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1338 return false; 1339 break; 1340 } 1341 if (BO->isAssignmentOp()) 1342 return false; 1343 Loc = BO->getOperatorLoc(); 1344 R1 = BO->getLHS()->getSourceRange(); 1345 R2 = BO->getRHS()->getSourceRange(); 1346 return true; 1347 } 1348 case CompoundAssignOperatorClass: 1349 case VAArgExprClass: 1350 return false; 1351 1352 case ConditionalOperatorClass: { 1353 // The condition must be evaluated, but if either the LHS or RHS is a 1354 // warning, warn about them. 1355 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1356 if (Exp->getLHS() && 1357 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1358 return true; 1359 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1360 } 1361 1362 case MemberExprClass: 1363 // If the base pointer or element is to a volatile pointer/field, accessing 1364 // it is a side effect. 1365 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1366 return false; 1367 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1368 R1 = SourceRange(Loc, Loc); 1369 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1370 return true; 1371 1372 case ArraySubscriptExprClass: 1373 // If the base pointer or element is to a volatile pointer/field, accessing 1374 // it is a side effect. 1375 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1376 return false; 1377 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1378 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1379 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1380 return true; 1381 1382 case CallExprClass: 1383 case CXXOperatorCallExprClass: 1384 case CXXMemberCallExprClass: { 1385 // If this is a direct call, get the callee. 1386 const CallExpr *CE = cast<CallExpr>(this); 1387 if (const Decl *FD = CE->getCalleeDecl()) { 1388 // If the callee has attribute pure, const, or warn_unused_result, warn 1389 // about it. void foo() { strlen("bar"); } should warn. 1390 // 1391 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1392 // updated to match for QoI. 1393 if (FD->getAttr<WarnUnusedResultAttr>() || 1394 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1395 Loc = CE->getCallee()->getLocStart(); 1396 R1 = CE->getCallee()->getSourceRange(); 1397 1398 if (unsigned NumArgs = CE->getNumArgs()) 1399 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1400 CE->getArg(NumArgs-1)->getLocEnd()); 1401 return true; 1402 } 1403 } 1404 return false; 1405 } 1406 1407 case CXXTemporaryObjectExprClass: 1408 case CXXConstructExprClass: 1409 return false; 1410 1411 case ObjCMessageExprClass: { 1412 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1413 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1414 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1415 Loc = getExprLoc(); 1416 return true; 1417 } 1418 return false; 1419 } 1420 1421 case ObjCPropertyRefExprClass: 1422 Loc = getExprLoc(); 1423 R1 = getSourceRange(); 1424 return true; 1425 1426 case StmtExprClass: { 1427 // Statement exprs don't logically have side effects themselves, but are 1428 // sometimes used in macros in ways that give them a type that is unused. 1429 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1430 // however, if the result of the stmt expr is dead, we don't want to emit a 1431 // warning. 1432 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1433 if (!CS->body_empty()) { 1434 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1435 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1436 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1437 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1438 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1439 } 1440 1441 if (getType()->isVoidType()) 1442 return false; 1443 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1444 R1 = getSourceRange(); 1445 return true; 1446 } 1447 case CStyleCastExprClass: 1448 // If this is an explicit cast to void, allow it. People do this when they 1449 // think they know what they're doing :). 1450 if (getType()->isVoidType()) 1451 return false; 1452 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1453 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1454 return true; 1455 case CXXFunctionalCastExprClass: { 1456 if (getType()->isVoidType()) 1457 return false; 1458 const CastExpr *CE = cast<CastExpr>(this); 1459 1460 // If this is a cast to void or a constructor conversion, check the operand. 1461 // Otherwise, the result of the cast is unused. 1462 if (CE->getCastKind() == CK_ToVoid || 1463 CE->getCastKind() == CK_ConstructorConversion) 1464 return (cast<CastExpr>(this)->getSubExpr() 1465 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1466 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1467 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1468 return true; 1469 } 1470 1471 case ImplicitCastExprClass: 1472 // Check the operand, since implicit casts are inserted by Sema 1473 return (cast<ImplicitCastExpr>(this) 1474 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1475 1476 case CXXDefaultArgExprClass: 1477 return (cast<CXXDefaultArgExpr>(this) 1478 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1479 1480 case CXXNewExprClass: 1481 // FIXME: In theory, there might be new expressions that don't have side 1482 // effects (e.g. a placement new with an uninitialized POD). 1483 case CXXDeleteExprClass: 1484 return false; 1485 case CXXBindTemporaryExprClass: 1486 return (cast<CXXBindTemporaryExpr>(this) 1487 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1488 case ExprWithCleanupsClass: 1489 return (cast<ExprWithCleanups>(this) 1490 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1491 } 1492} 1493 1494/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1495/// returns true, if it is; false otherwise. 1496bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1497 switch (getStmtClass()) { 1498 default: 1499 return false; 1500 case ObjCIvarRefExprClass: 1501 return true; 1502 case Expr::UnaryOperatorClass: 1503 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1504 case ParenExprClass: 1505 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1506 case ImplicitCastExprClass: 1507 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1508 case CStyleCastExprClass: 1509 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1510 case DeclRefExprClass: { 1511 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1512 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1513 if (VD->hasGlobalStorage()) 1514 return true; 1515 QualType T = VD->getType(); 1516 // dereferencing to a pointer is always a gc'able candidate, 1517 // unless it is __weak. 1518 return T->isPointerType() && 1519 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1520 } 1521 return false; 1522 } 1523 case MemberExprClass: { 1524 const MemberExpr *M = cast<MemberExpr>(this); 1525 return M->getBase()->isOBJCGCCandidate(Ctx); 1526 } 1527 case ArraySubscriptExprClass: 1528 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1529 } 1530} 1531 1532bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1533 if (isTypeDependent()) 1534 return false; 1535 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1536} 1537 1538static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1539 Expr::CanThrowResult CT2) { 1540 // CanThrowResult constants are ordered so that the maximum is the correct 1541 // merge result. 1542 return CT1 > CT2 ? CT1 : CT2; 1543} 1544 1545static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1546 Expr *E = const_cast<Expr*>(CE); 1547 Expr::CanThrowResult R = Expr::CT_Cannot; 1548 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1549 I != IE && R != Expr::CT_Can; ++I) { 1550 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1551 } 1552 return R; 1553} 1554 1555static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1556 bool NullThrows = true) { 1557 if (!D) 1558 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1559 1560 // See if we can get a function type from the decl somehow. 1561 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1562 if (!VD) // If we have no clue what we're calling, assume the worst. 1563 return Expr::CT_Can; 1564 1565 // As an extension, we assume that __attribute__((nothrow)) functions don't 1566 // throw. 1567 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1568 return Expr::CT_Cannot; 1569 1570 QualType T = VD->getType(); 1571 const FunctionProtoType *FT; 1572 if ((FT = T->getAs<FunctionProtoType>())) { 1573 } else if (const PointerType *PT = T->getAs<PointerType>()) 1574 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1575 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1576 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1577 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1578 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1579 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1580 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1581 1582 if (!FT) 1583 return Expr::CT_Can; 1584 1585 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1586} 1587 1588static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1589 if (DC->isTypeDependent()) 1590 return Expr::CT_Dependent; 1591 1592 if (!DC->getTypeAsWritten()->isReferenceType()) 1593 return Expr::CT_Cannot; 1594 1595 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1596} 1597 1598static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1599 const CXXTypeidExpr *DC) { 1600 if (DC->isTypeOperand()) 1601 return Expr::CT_Cannot; 1602 1603 Expr *Op = DC->getExprOperand(); 1604 if (Op->isTypeDependent()) 1605 return Expr::CT_Dependent; 1606 1607 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1608 if (!RT) 1609 return Expr::CT_Cannot; 1610 1611 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1612 return Expr::CT_Cannot; 1613 1614 if (Op->Classify(C).isPRValue()) 1615 return Expr::CT_Cannot; 1616 1617 return Expr::CT_Can; 1618} 1619 1620Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1621 // C++ [expr.unary.noexcept]p3: 1622 // [Can throw] if in a potentially-evaluated context the expression would 1623 // contain: 1624 switch (getStmtClass()) { 1625 case CXXThrowExprClass: 1626 // - a potentially evaluated throw-expression 1627 return CT_Can; 1628 1629 case CXXDynamicCastExprClass: { 1630 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1631 // where T is a reference type, that requires a run-time check 1632 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1633 if (CT == CT_Can) 1634 return CT; 1635 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1636 } 1637 1638 case CXXTypeidExprClass: 1639 // - a potentially evaluated typeid expression applied to a glvalue 1640 // expression whose type is a polymorphic class type 1641 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1642 1643 // - a potentially evaluated call to a function, member function, function 1644 // pointer, or member function pointer that does not have a non-throwing 1645 // exception-specification 1646 case CallExprClass: 1647 case CXXOperatorCallExprClass: 1648 case CXXMemberCallExprClass: { 1649 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1650 if (CT == CT_Can) 1651 return CT; 1652 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1653 } 1654 1655 case CXXConstructExprClass: 1656 case CXXTemporaryObjectExprClass: { 1657 CanThrowResult CT = CanCalleeThrow( 1658 cast<CXXConstructExpr>(this)->getConstructor()); 1659 if (CT == CT_Can) 1660 return CT; 1661 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1662 } 1663 1664 case CXXNewExprClass: { 1665 CanThrowResult CT = MergeCanThrow( 1666 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1667 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1668 /*NullThrows*/false)); 1669 if (CT == CT_Can) 1670 return CT; 1671 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1672 } 1673 1674 case CXXDeleteExprClass: { 1675 CanThrowResult CT = CanCalleeThrow( 1676 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1677 if (CT == CT_Can) 1678 return CT; 1679 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1680 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1681 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1682 Arg = Cast->getSubExpr(); 1683 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1684 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1685 CanThrowResult CT2 = CanCalleeThrow( 1686 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1687 if (CT2 == CT_Can) 1688 return CT2; 1689 CT = MergeCanThrow(CT, CT2); 1690 } 1691 } 1692 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1693 } 1694 1695 case CXXBindTemporaryExprClass: { 1696 // The bound temporary has to be destroyed again, which might throw. 1697 CanThrowResult CT = CanCalleeThrow( 1698 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1699 if (CT == CT_Can) 1700 return CT; 1701 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1702 } 1703 1704 // ObjC message sends are like function calls, but never have exception 1705 // specs. 1706 case ObjCMessageExprClass: 1707 case ObjCPropertyRefExprClass: 1708 return CT_Can; 1709 1710 // Many other things have subexpressions, so we have to test those. 1711 // Some are simple: 1712 case ParenExprClass: 1713 case MemberExprClass: 1714 case CXXReinterpretCastExprClass: 1715 case CXXConstCastExprClass: 1716 case ConditionalOperatorClass: 1717 case CompoundLiteralExprClass: 1718 case ExtVectorElementExprClass: 1719 case InitListExprClass: 1720 case DesignatedInitExprClass: 1721 case ParenListExprClass: 1722 case VAArgExprClass: 1723 case CXXDefaultArgExprClass: 1724 case ExprWithCleanupsClass: 1725 case ObjCIvarRefExprClass: 1726 case ObjCIsaExprClass: 1727 case ShuffleVectorExprClass: 1728 return CanSubExprsThrow(C, this); 1729 1730 // Some might be dependent for other reasons. 1731 case UnaryOperatorClass: 1732 case ArraySubscriptExprClass: 1733 case ImplicitCastExprClass: 1734 case CStyleCastExprClass: 1735 case CXXStaticCastExprClass: 1736 case CXXFunctionalCastExprClass: 1737 case BinaryOperatorClass: 1738 case CompoundAssignOperatorClass: { 1739 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1740 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1741 } 1742 1743 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1744 case StmtExprClass: 1745 return CT_Can; 1746 1747 case ChooseExprClass: 1748 if (isTypeDependent() || isValueDependent()) 1749 return CT_Dependent; 1750 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1751 1752 // Some expressions are always dependent. 1753 case DependentScopeDeclRefExprClass: 1754 case CXXUnresolvedConstructExprClass: 1755 case CXXDependentScopeMemberExprClass: 1756 return CT_Dependent; 1757 1758 default: 1759 // All other expressions don't have subexpressions, or else they are 1760 // unevaluated. 1761 return CT_Cannot; 1762 } 1763} 1764 1765Expr* Expr::IgnoreParens() { 1766 Expr* E = this; 1767 while (true) { 1768 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1769 E = P->getSubExpr(); 1770 continue; 1771 } 1772 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1773 if (P->getOpcode() == UO_Extension) { 1774 E = P->getSubExpr(); 1775 continue; 1776 } 1777 } 1778 return E; 1779 } 1780} 1781 1782/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1783/// or CastExprs or ImplicitCastExprs, returning their operand. 1784Expr *Expr::IgnoreParenCasts() { 1785 Expr *E = this; 1786 while (true) { 1787 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1788 E = P->getSubExpr(); 1789 continue; 1790 } 1791 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1792 E = P->getSubExpr(); 1793 continue; 1794 } 1795 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1796 if (P->getOpcode() == UO_Extension) { 1797 E = P->getSubExpr(); 1798 continue; 1799 } 1800 } 1801 return E; 1802 } 1803} 1804 1805/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1806/// casts. This is intended purely as a temporary workaround for code 1807/// that hasn't yet been rewritten to do the right thing about those 1808/// casts, and may disappear along with the last internal use. 1809Expr *Expr::IgnoreParenLValueCasts() { 1810 Expr *E = this; 1811 while (true) { 1812 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1813 E = P->getSubExpr(); 1814 continue; 1815 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1816 if (P->getCastKind() == CK_LValueToRValue) { 1817 E = P->getSubExpr(); 1818 continue; 1819 } 1820 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1821 if (P->getOpcode() == UO_Extension) { 1822 E = P->getSubExpr(); 1823 continue; 1824 } 1825 } 1826 break; 1827 } 1828 return E; 1829} 1830 1831Expr *Expr::IgnoreParenImpCasts() { 1832 Expr *E = this; 1833 while (true) { 1834 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1835 E = P->getSubExpr(); 1836 continue; 1837 } 1838 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1839 E = P->getSubExpr(); 1840 continue; 1841 } 1842 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1843 if (P->getOpcode() == UO_Extension) { 1844 E = P->getSubExpr(); 1845 continue; 1846 } 1847 } 1848 return E; 1849 } 1850} 1851 1852/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1853/// value (including ptr->int casts of the same size). Strip off any 1854/// ParenExpr or CastExprs, returning their operand. 1855Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1856 Expr *E = this; 1857 while (true) { 1858 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1859 E = P->getSubExpr(); 1860 continue; 1861 } 1862 1863 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1864 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1865 // ptr<->int casts of the same width. We also ignore all identity casts. 1866 Expr *SE = P->getSubExpr(); 1867 1868 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1869 E = SE; 1870 continue; 1871 } 1872 1873 if ((E->getType()->isPointerType() || 1874 E->getType()->isIntegralType(Ctx)) && 1875 (SE->getType()->isPointerType() || 1876 SE->getType()->isIntegralType(Ctx)) && 1877 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1878 E = SE; 1879 continue; 1880 } 1881 } 1882 1883 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1884 if (P->getOpcode() == UO_Extension) { 1885 E = P->getSubExpr(); 1886 continue; 1887 } 1888 } 1889 1890 return E; 1891 } 1892} 1893 1894bool Expr::isDefaultArgument() const { 1895 const Expr *E = this; 1896 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1897 E = ICE->getSubExprAsWritten(); 1898 1899 return isa<CXXDefaultArgExpr>(E); 1900} 1901 1902/// \brief Skip over any no-op casts and any temporary-binding 1903/// expressions. 1904static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1905 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1906 if (ICE->getCastKind() == CK_NoOp) 1907 E = ICE->getSubExpr(); 1908 else 1909 break; 1910 } 1911 1912 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1913 E = BE->getSubExpr(); 1914 1915 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1916 if (ICE->getCastKind() == CK_NoOp) 1917 E = ICE->getSubExpr(); 1918 else 1919 break; 1920 } 1921 1922 return E->IgnoreParens(); 1923} 1924 1925/// isTemporaryObject - Determines if this expression produces a 1926/// temporary of the given class type. 1927bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1928 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1929 return false; 1930 1931 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1932 1933 // Temporaries are by definition pr-values of class type. 1934 if (!E->Classify(C).isPRValue()) { 1935 // In this context, property reference is a message call and is pr-value. 1936 if (!isa<ObjCPropertyRefExpr>(E)) 1937 return false; 1938 } 1939 1940 // Black-list a few cases which yield pr-values of class type that don't 1941 // refer to temporaries of that type: 1942 1943 // - implicit derived-to-base conversions 1944 if (isa<ImplicitCastExpr>(E)) { 1945 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1946 case CK_DerivedToBase: 1947 case CK_UncheckedDerivedToBase: 1948 return false; 1949 default: 1950 break; 1951 } 1952 } 1953 1954 // - member expressions (all) 1955 if (isa<MemberExpr>(E)) 1956 return false; 1957 1958 return true; 1959} 1960 1961/// hasAnyTypeDependentArguments - Determines if any of the expressions 1962/// in Exprs is type-dependent. 1963bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1964 for (unsigned I = 0; I < NumExprs; ++I) 1965 if (Exprs[I]->isTypeDependent()) 1966 return true; 1967 1968 return false; 1969} 1970 1971/// hasAnyValueDependentArguments - Determines if any of the expressions 1972/// in Exprs is value-dependent. 1973bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1974 for (unsigned I = 0; I < NumExprs; ++I) 1975 if (Exprs[I]->isValueDependent()) 1976 return true; 1977 1978 return false; 1979} 1980 1981bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1982 // This function is attempting whether an expression is an initializer 1983 // which can be evaluated at compile-time. isEvaluatable handles most 1984 // of the cases, but it can't deal with some initializer-specific 1985 // expressions, and it can't deal with aggregates; we deal with those here, 1986 // and fall back to isEvaluatable for the other cases. 1987 1988 // If we ever capture reference-binding directly in the AST, we can 1989 // kill the second parameter. 1990 1991 if (IsForRef) { 1992 EvalResult Result; 1993 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1994 } 1995 1996 switch (getStmtClass()) { 1997 default: break; 1998 case StringLiteralClass: 1999 case ObjCStringLiteralClass: 2000 case ObjCEncodeExprClass: 2001 return true; 2002 case CXXTemporaryObjectExprClass: 2003 case CXXConstructExprClass: { 2004 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2005 2006 // Only if it's 2007 // 1) an application of the trivial default constructor or 2008 if (!CE->getConstructor()->isTrivial()) return false; 2009 if (!CE->getNumArgs()) return true; 2010 2011 // 2) an elidable trivial copy construction of an operand which is 2012 // itself a constant initializer. Note that we consider the 2013 // operand on its own, *not* as a reference binding. 2014 return CE->isElidable() && 2015 CE->getArg(0)->isConstantInitializer(Ctx, false); 2016 } 2017 case CompoundLiteralExprClass: { 2018 // This handles gcc's extension that allows global initializers like 2019 // "struct x {int x;} x = (struct x) {};". 2020 // FIXME: This accepts other cases it shouldn't! 2021 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2022 return Exp->isConstantInitializer(Ctx, false); 2023 } 2024 case InitListExprClass: { 2025 // FIXME: This doesn't deal with fields with reference types correctly. 2026 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2027 // to bitfields. 2028 const InitListExpr *Exp = cast<InitListExpr>(this); 2029 unsigned numInits = Exp->getNumInits(); 2030 for (unsigned i = 0; i < numInits; i++) { 2031 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2032 return false; 2033 } 2034 return true; 2035 } 2036 case ImplicitValueInitExprClass: 2037 return true; 2038 case ParenExprClass: 2039 return cast<ParenExpr>(this)->getSubExpr() 2040 ->isConstantInitializer(Ctx, IsForRef); 2041 case ChooseExprClass: 2042 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2043 ->isConstantInitializer(Ctx, IsForRef); 2044 case UnaryOperatorClass: { 2045 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2046 if (Exp->getOpcode() == UO_Extension) 2047 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2048 break; 2049 } 2050 case BinaryOperatorClass: { 2051 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2052 // but this handles the common case. 2053 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2054 if (Exp->getOpcode() == BO_Sub && 2055 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2056 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2057 return true; 2058 break; 2059 } 2060 case CXXFunctionalCastExprClass: 2061 case CXXStaticCastExprClass: 2062 case ImplicitCastExprClass: 2063 case CStyleCastExprClass: 2064 // Handle casts with a destination that's a struct or union; this 2065 // deals with both the gcc no-op struct cast extension and the 2066 // cast-to-union extension. 2067 if (getType()->isRecordType()) 2068 return cast<CastExpr>(this)->getSubExpr() 2069 ->isConstantInitializer(Ctx, false); 2070 2071 // Integer->integer casts can be handled here, which is important for 2072 // things like (int)(&&x-&&y). Scary but true. 2073 if (getType()->isIntegerType() && 2074 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2075 return cast<CastExpr>(this)->getSubExpr() 2076 ->isConstantInitializer(Ctx, false); 2077 2078 break; 2079 } 2080 return isEvaluatable(Ctx); 2081} 2082 2083/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2084/// integer constant expression with the value zero, or if this is one that is 2085/// cast to void*. 2086bool Expr::isNullPointerConstant(ASTContext &Ctx, 2087 NullPointerConstantValueDependence NPC) const { 2088 if (isValueDependent()) { 2089 switch (NPC) { 2090 case NPC_NeverValueDependent: 2091 assert(false && "Unexpected value dependent expression!"); 2092 // If the unthinkable happens, fall through to the safest alternative. 2093 2094 case NPC_ValueDependentIsNull: 2095 return isTypeDependent() || getType()->isIntegralType(Ctx); 2096 2097 case NPC_ValueDependentIsNotNull: 2098 return false; 2099 } 2100 } 2101 2102 // Strip off a cast to void*, if it exists. Except in C++. 2103 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2104 if (!Ctx.getLangOptions().CPlusPlus) { 2105 // Check that it is a cast to void*. 2106 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2107 QualType Pointee = PT->getPointeeType(); 2108 if (!Pointee.hasQualifiers() && 2109 Pointee->isVoidType() && // to void* 2110 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2111 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2112 } 2113 } 2114 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2115 // Ignore the ImplicitCastExpr type entirely. 2116 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2117 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2118 // Accept ((void*)0) as a null pointer constant, as many other 2119 // implementations do. 2120 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2121 } else if (const CXXDefaultArgExpr *DefaultArg 2122 = dyn_cast<CXXDefaultArgExpr>(this)) { 2123 // See through default argument expressions 2124 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2125 } else if (isa<GNUNullExpr>(this)) { 2126 // The GNU __null extension is always a null pointer constant. 2127 return true; 2128 } 2129 2130 // C++0x nullptr_t is always a null pointer constant. 2131 if (getType()->isNullPtrType()) 2132 return true; 2133 2134 if (const RecordType *UT = getType()->getAsUnionType()) 2135 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2136 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2137 const Expr *InitExpr = CLE->getInitializer(); 2138 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2139 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2140 } 2141 // This expression must be an integer type. 2142 if (!getType()->isIntegerType() || 2143 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2144 return false; 2145 2146 // If we have an integer constant expression, we need to *evaluate* it and 2147 // test for the value 0. 2148 llvm::APSInt Result; 2149 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2150} 2151 2152/// \brief If this expression is an l-value for an Objective C 2153/// property, find the underlying property reference expression. 2154const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2155 const Expr *E = this; 2156 while (true) { 2157 assert((E->getValueKind() == VK_LValue && 2158 E->getObjectKind() == OK_ObjCProperty) && 2159 "expression is not a property reference"); 2160 E = E->IgnoreParenCasts(); 2161 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2162 if (BO->getOpcode() == BO_Comma) { 2163 E = BO->getRHS(); 2164 continue; 2165 } 2166 } 2167 2168 break; 2169 } 2170 2171 return cast<ObjCPropertyRefExpr>(E); 2172} 2173 2174FieldDecl *Expr::getBitField() { 2175 Expr *E = this->IgnoreParens(); 2176 2177 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2178 if (ICE->getCastKind() == CK_LValueToRValue || 2179 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2180 E = ICE->getSubExpr()->IgnoreParens(); 2181 else 2182 break; 2183 } 2184 2185 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2186 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2187 if (Field->isBitField()) 2188 return Field; 2189 2190 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2191 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2192 if (Field->isBitField()) 2193 return Field; 2194 2195 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2196 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2197 return BinOp->getLHS()->getBitField(); 2198 2199 return 0; 2200} 2201 2202bool Expr::refersToVectorElement() const { 2203 const Expr *E = this->IgnoreParens(); 2204 2205 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2206 if (ICE->getValueKind() != VK_RValue && 2207 ICE->getCastKind() == CK_NoOp) 2208 E = ICE->getSubExpr()->IgnoreParens(); 2209 else 2210 break; 2211 } 2212 2213 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2214 return ASE->getBase()->getType()->isVectorType(); 2215 2216 if (isa<ExtVectorElementExpr>(E)) 2217 return true; 2218 2219 return false; 2220} 2221 2222/// isArrow - Return true if the base expression is a pointer to vector, 2223/// return false if the base expression is a vector. 2224bool ExtVectorElementExpr::isArrow() const { 2225 return getBase()->getType()->isPointerType(); 2226} 2227 2228unsigned ExtVectorElementExpr::getNumElements() const { 2229 if (const VectorType *VT = getType()->getAs<VectorType>()) 2230 return VT->getNumElements(); 2231 return 1; 2232} 2233 2234/// containsDuplicateElements - Return true if any element access is repeated. 2235bool ExtVectorElementExpr::containsDuplicateElements() const { 2236 // FIXME: Refactor this code to an accessor on the AST node which returns the 2237 // "type" of component access, and share with code below and in Sema. 2238 llvm::StringRef Comp = Accessor->getName(); 2239 2240 // Halving swizzles do not contain duplicate elements. 2241 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2242 return false; 2243 2244 // Advance past s-char prefix on hex swizzles. 2245 if (Comp[0] == 's' || Comp[0] == 'S') 2246 Comp = Comp.substr(1); 2247 2248 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2249 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2250 return true; 2251 2252 return false; 2253} 2254 2255/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2256void ExtVectorElementExpr::getEncodedElementAccess( 2257 llvm::SmallVectorImpl<unsigned> &Elts) const { 2258 llvm::StringRef Comp = Accessor->getName(); 2259 if (Comp[0] == 's' || Comp[0] == 'S') 2260 Comp = Comp.substr(1); 2261 2262 bool isHi = Comp == "hi"; 2263 bool isLo = Comp == "lo"; 2264 bool isEven = Comp == "even"; 2265 bool isOdd = Comp == "odd"; 2266 2267 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2268 uint64_t Index; 2269 2270 if (isHi) 2271 Index = e + i; 2272 else if (isLo) 2273 Index = i; 2274 else if (isEven) 2275 Index = 2 * i; 2276 else if (isOdd) 2277 Index = 2 * i + 1; 2278 else 2279 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2280 2281 Elts.push_back(Index); 2282 } 2283} 2284 2285ObjCMessageExpr::ObjCMessageExpr(QualType T, 2286 ExprValueKind VK, 2287 SourceLocation LBracLoc, 2288 SourceLocation SuperLoc, 2289 bool IsInstanceSuper, 2290 QualType SuperType, 2291 Selector Sel, 2292 SourceLocation SelLoc, 2293 ObjCMethodDecl *Method, 2294 Expr **Args, unsigned NumArgs, 2295 SourceLocation RBracLoc) 2296 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2297 /*TypeDependent=*/false, /*ValueDependent=*/false, 2298 /*ContainsUnexpandedParameterPack=*/false), 2299 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2300 HasMethod(Method != 0), SuperLoc(SuperLoc), 2301 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2302 : Sel.getAsOpaquePtr())), 2303 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2304{ 2305 setReceiverPointer(SuperType.getAsOpaquePtr()); 2306 if (NumArgs) 2307 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2308} 2309 2310ObjCMessageExpr::ObjCMessageExpr(QualType T, 2311 ExprValueKind VK, 2312 SourceLocation LBracLoc, 2313 TypeSourceInfo *Receiver, 2314 Selector Sel, 2315 SourceLocation SelLoc, 2316 ObjCMethodDecl *Method, 2317 Expr **Args, unsigned NumArgs, 2318 SourceLocation RBracLoc) 2319 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2320 T->isDependentType(), T->containsUnexpandedParameterPack()), 2321 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2322 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2323 : Sel.getAsOpaquePtr())), 2324 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2325{ 2326 setReceiverPointer(Receiver); 2327 Expr **MyArgs = getArgs(); 2328 for (unsigned I = 0; I != NumArgs; ++I) { 2329 if (Args[I]->isTypeDependent()) 2330 ExprBits.TypeDependent = true; 2331 if (Args[I]->isValueDependent()) 2332 ExprBits.ValueDependent = true; 2333 if (Args[I]->containsUnexpandedParameterPack()) 2334 ExprBits.ContainsUnexpandedParameterPack = true; 2335 2336 MyArgs[I] = Args[I]; 2337 } 2338} 2339 2340ObjCMessageExpr::ObjCMessageExpr(QualType T, 2341 ExprValueKind VK, 2342 SourceLocation LBracLoc, 2343 Expr *Receiver, 2344 Selector Sel, 2345 SourceLocation SelLoc, 2346 ObjCMethodDecl *Method, 2347 Expr **Args, unsigned NumArgs, 2348 SourceLocation RBracLoc) 2349 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2350 Receiver->isTypeDependent(), 2351 Receiver->containsUnexpandedParameterPack()), 2352 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2353 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2354 : Sel.getAsOpaquePtr())), 2355 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2356{ 2357 setReceiverPointer(Receiver); 2358 Expr **MyArgs = getArgs(); 2359 for (unsigned I = 0; I != NumArgs; ++I) { 2360 if (Args[I]->isTypeDependent()) 2361 ExprBits.TypeDependent = true; 2362 if (Args[I]->isValueDependent()) 2363 ExprBits.ValueDependent = true; 2364 if (Args[I]->containsUnexpandedParameterPack()) 2365 ExprBits.ContainsUnexpandedParameterPack = true; 2366 2367 MyArgs[I] = Args[I]; 2368 } 2369} 2370 2371ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2372 ExprValueKind VK, 2373 SourceLocation LBracLoc, 2374 SourceLocation SuperLoc, 2375 bool IsInstanceSuper, 2376 QualType SuperType, 2377 Selector Sel, 2378 SourceLocation SelLoc, 2379 ObjCMethodDecl *Method, 2380 Expr **Args, unsigned NumArgs, 2381 SourceLocation RBracLoc) { 2382 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2383 NumArgs * sizeof(Expr *); 2384 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2385 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2386 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2387 RBracLoc); 2388} 2389 2390ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2391 ExprValueKind VK, 2392 SourceLocation LBracLoc, 2393 TypeSourceInfo *Receiver, 2394 Selector Sel, 2395 SourceLocation SelLoc, 2396 ObjCMethodDecl *Method, 2397 Expr **Args, unsigned NumArgs, 2398 SourceLocation RBracLoc) { 2399 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2400 NumArgs * sizeof(Expr *); 2401 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2402 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2403 Method, Args, NumArgs, RBracLoc); 2404} 2405 2406ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2407 ExprValueKind VK, 2408 SourceLocation LBracLoc, 2409 Expr *Receiver, 2410 Selector Sel, 2411 SourceLocation SelLoc, 2412 ObjCMethodDecl *Method, 2413 Expr **Args, unsigned NumArgs, 2414 SourceLocation RBracLoc) { 2415 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2416 NumArgs * sizeof(Expr *); 2417 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2418 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2419 Method, Args, NumArgs, RBracLoc); 2420} 2421 2422ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2423 unsigned NumArgs) { 2424 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2425 NumArgs * sizeof(Expr *); 2426 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2427 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2428} 2429 2430SourceRange ObjCMessageExpr::getReceiverRange() const { 2431 switch (getReceiverKind()) { 2432 case Instance: 2433 return getInstanceReceiver()->getSourceRange(); 2434 2435 case Class: 2436 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2437 2438 case SuperInstance: 2439 case SuperClass: 2440 return getSuperLoc(); 2441 } 2442 2443 return SourceLocation(); 2444} 2445 2446Selector ObjCMessageExpr::getSelector() const { 2447 if (HasMethod) 2448 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2449 ->getSelector(); 2450 return Selector(SelectorOrMethod); 2451} 2452 2453ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2454 switch (getReceiverKind()) { 2455 case Instance: 2456 if (const ObjCObjectPointerType *Ptr 2457 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2458 return Ptr->getInterfaceDecl(); 2459 break; 2460 2461 case Class: 2462 if (const ObjCObjectType *Ty 2463 = getClassReceiver()->getAs<ObjCObjectType>()) 2464 return Ty->getInterface(); 2465 break; 2466 2467 case SuperInstance: 2468 if (const ObjCObjectPointerType *Ptr 2469 = getSuperType()->getAs<ObjCObjectPointerType>()) 2470 return Ptr->getInterfaceDecl(); 2471 break; 2472 2473 case SuperClass: 2474 if (const ObjCObjectType *Iface 2475 = getSuperType()->getAs<ObjCObjectType>()) 2476 return Iface->getInterface(); 2477 break; 2478 } 2479 2480 return 0; 2481} 2482 2483bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2484 return getCond()->EvaluateAsInt(C) != 0; 2485} 2486 2487ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2488 QualType Type, SourceLocation BLoc, 2489 SourceLocation RP) 2490 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2491 Type->isDependentType(), Type->isDependentType(), 2492 Type->containsUnexpandedParameterPack()), 2493 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2494{ 2495 SubExprs = new (C) Stmt*[nexpr]; 2496 for (unsigned i = 0; i < nexpr; i++) { 2497 if (args[i]->isTypeDependent()) 2498 ExprBits.TypeDependent = true; 2499 if (args[i]->isValueDependent()) 2500 ExprBits.ValueDependent = true; 2501 if (args[i]->containsUnexpandedParameterPack()) 2502 ExprBits.ContainsUnexpandedParameterPack = true; 2503 2504 SubExprs[i] = args[i]; 2505 } 2506} 2507 2508void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2509 unsigned NumExprs) { 2510 if (SubExprs) C.Deallocate(SubExprs); 2511 2512 SubExprs = new (C) Stmt* [NumExprs]; 2513 this->NumExprs = NumExprs; 2514 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2515} 2516 2517//===----------------------------------------------------------------------===// 2518// DesignatedInitExpr 2519//===----------------------------------------------------------------------===// 2520 2521IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2522 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2523 if (Field.NameOrField & 0x01) 2524 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2525 else 2526 return getField()->getIdentifier(); 2527} 2528 2529DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2530 unsigned NumDesignators, 2531 const Designator *Designators, 2532 SourceLocation EqualOrColonLoc, 2533 bool GNUSyntax, 2534 Expr **IndexExprs, 2535 unsigned NumIndexExprs, 2536 Expr *Init) 2537 : Expr(DesignatedInitExprClass, Ty, 2538 Init->getValueKind(), Init->getObjectKind(), 2539 Init->isTypeDependent(), Init->isValueDependent(), 2540 Init->containsUnexpandedParameterPack()), 2541 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2542 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2543 this->Designators = new (C) Designator[NumDesignators]; 2544 2545 // Record the initializer itself. 2546 child_iterator Child = child_begin(); 2547 *Child++ = Init; 2548 2549 // Copy the designators and their subexpressions, computing 2550 // value-dependence along the way. 2551 unsigned IndexIdx = 0; 2552 for (unsigned I = 0; I != NumDesignators; ++I) { 2553 this->Designators[I] = Designators[I]; 2554 2555 if (this->Designators[I].isArrayDesignator()) { 2556 // Compute type- and value-dependence. 2557 Expr *Index = IndexExprs[IndexIdx]; 2558 if (Index->isTypeDependent() || Index->isValueDependent()) 2559 ExprBits.ValueDependent = true; 2560 2561 // Propagate unexpanded parameter packs. 2562 if (Index->containsUnexpandedParameterPack()) 2563 ExprBits.ContainsUnexpandedParameterPack = true; 2564 2565 // Copy the index expressions into permanent storage. 2566 *Child++ = IndexExprs[IndexIdx++]; 2567 } else if (this->Designators[I].isArrayRangeDesignator()) { 2568 // Compute type- and value-dependence. 2569 Expr *Start = IndexExprs[IndexIdx]; 2570 Expr *End = IndexExprs[IndexIdx + 1]; 2571 if (Start->isTypeDependent() || Start->isValueDependent() || 2572 End->isTypeDependent() || End->isValueDependent()) 2573 ExprBits.ValueDependent = true; 2574 2575 // Propagate unexpanded parameter packs. 2576 if (Start->containsUnexpandedParameterPack() || 2577 End->containsUnexpandedParameterPack()) 2578 ExprBits.ContainsUnexpandedParameterPack = true; 2579 2580 // Copy the start/end expressions into permanent storage. 2581 *Child++ = IndexExprs[IndexIdx++]; 2582 *Child++ = IndexExprs[IndexIdx++]; 2583 } 2584 } 2585 2586 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2587} 2588 2589DesignatedInitExpr * 2590DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2591 unsigned NumDesignators, 2592 Expr **IndexExprs, unsigned NumIndexExprs, 2593 SourceLocation ColonOrEqualLoc, 2594 bool UsesColonSyntax, Expr *Init) { 2595 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2596 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2597 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2598 ColonOrEqualLoc, UsesColonSyntax, 2599 IndexExprs, NumIndexExprs, Init); 2600} 2601 2602DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2603 unsigned NumIndexExprs) { 2604 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2605 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2606 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2607} 2608 2609void DesignatedInitExpr::setDesignators(ASTContext &C, 2610 const Designator *Desigs, 2611 unsigned NumDesigs) { 2612 Designators = new (C) Designator[NumDesigs]; 2613 NumDesignators = NumDesigs; 2614 for (unsigned I = 0; I != NumDesigs; ++I) 2615 Designators[I] = Desigs[I]; 2616} 2617 2618SourceRange DesignatedInitExpr::getSourceRange() const { 2619 SourceLocation StartLoc; 2620 Designator &First = 2621 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2622 if (First.isFieldDesignator()) { 2623 if (GNUSyntax) 2624 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2625 else 2626 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2627 } else 2628 StartLoc = 2629 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2630 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2631} 2632 2633Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2634 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2635 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2636 Ptr += sizeof(DesignatedInitExpr); 2637 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2638 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2639} 2640 2641Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2642 assert(D.Kind == Designator::ArrayRangeDesignator && 2643 "Requires array range designator"); 2644 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2645 Ptr += sizeof(DesignatedInitExpr); 2646 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2647 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2648} 2649 2650Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2651 assert(D.Kind == Designator::ArrayRangeDesignator && 2652 "Requires array range designator"); 2653 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2654 Ptr += sizeof(DesignatedInitExpr); 2655 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2656 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2657} 2658 2659/// \brief Replaces the designator at index @p Idx with the series 2660/// of designators in [First, Last). 2661void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2662 const Designator *First, 2663 const Designator *Last) { 2664 unsigned NumNewDesignators = Last - First; 2665 if (NumNewDesignators == 0) { 2666 std::copy_backward(Designators + Idx + 1, 2667 Designators + NumDesignators, 2668 Designators + Idx); 2669 --NumNewDesignators; 2670 return; 2671 } else if (NumNewDesignators == 1) { 2672 Designators[Idx] = *First; 2673 return; 2674 } 2675 2676 Designator *NewDesignators 2677 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2678 std::copy(Designators, Designators + Idx, NewDesignators); 2679 std::copy(First, Last, NewDesignators + Idx); 2680 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2681 NewDesignators + Idx + NumNewDesignators); 2682 Designators = NewDesignators; 2683 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2684} 2685 2686ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2687 Expr **exprs, unsigned nexprs, 2688 SourceLocation rparenloc) 2689 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2690 false, false, false), 2691 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2692 2693 Exprs = new (C) Stmt*[nexprs]; 2694 for (unsigned i = 0; i != nexprs; ++i) { 2695 if (exprs[i]->isTypeDependent()) 2696 ExprBits.TypeDependent = true; 2697 if (exprs[i]->isValueDependent()) 2698 ExprBits.ValueDependent = true; 2699 if (exprs[i]->containsUnexpandedParameterPack()) 2700 ExprBits.ContainsUnexpandedParameterPack = true; 2701 2702 Exprs[i] = exprs[i]; 2703 } 2704} 2705 2706//===----------------------------------------------------------------------===// 2707// ExprIterator. 2708//===----------------------------------------------------------------------===// 2709 2710Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2711Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2712Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2713const Expr* ConstExprIterator::operator[](size_t idx) const { 2714 return cast<Expr>(I[idx]); 2715} 2716const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2717const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2718 2719//===----------------------------------------------------------------------===// 2720// Child Iterators for iterating over subexpressions/substatements 2721//===----------------------------------------------------------------------===// 2722 2723// DeclRefExpr 2724Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2725Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2726 2727// ObjCIvarRefExpr 2728Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2729Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2730 2731// ObjCPropertyRefExpr 2732Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2733{ 2734 if (Receiver.is<Stmt*>()) { 2735 // Hack alert! 2736 return reinterpret_cast<Stmt**> (&Receiver); 2737 } 2738 return child_iterator(); 2739} 2740 2741Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2742{ return Receiver.is<Stmt*>() ? 2743 reinterpret_cast<Stmt**> (&Receiver)+1 : 2744 child_iterator(); 2745} 2746 2747// ObjCIsaExpr 2748Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2749Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2750 2751// PredefinedExpr 2752Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2753Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2754 2755// IntegerLiteral 2756Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2757Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2758 2759// CharacterLiteral 2760Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2761Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2762 2763// FloatingLiteral 2764Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2765Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2766 2767// ImaginaryLiteral 2768Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2769Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2770 2771// StringLiteral 2772Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2773Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2774 2775// ParenExpr 2776Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2777Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2778 2779// UnaryOperator 2780Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2781Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2782 2783// OffsetOfExpr 2784Stmt::child_iterator OffsetOfExpr::child_begin() { 2785 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2786 + NumComps); 2787} 2788Stmt::child_iterator OffsetOfExpr::child_end() { 2789 return child_iterator(&*child_begin() + NumExprs); 2790} 2791 2792// SizeOfAlignOfExpr 2793Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2794 // If this is of a type and the type is a VLA type (and not a typedef), the 2795 // size expression of the VLA needs to be treated as an executable expression. 2796 // Why isn't this weirdness documented better in StmtIterator? 2797 if (isArgumentType()) { 2798 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 2799 getArgumentType().getTypePtr())) 2800 return child_iterator(T); 2801 return child_iterator(); 2802 } 2803 return child_iterator(&Argument.Ex); 2804} 2805Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2806 if (isArgumentType()) 2807 return child_iterator(); 2808 return child_iterator(&Argument.Ex + 1); 2809} 2810 2811// ArraySubscriptExpr 2812Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2813 return &SubExprs[0]; 2814} 2815Stmt::child_iterator ArraySubscriptExpr::child_end() { 2816 return &SubExprs[0]+END_EXPR; 2817} 2818 2819// CallExpr 2820Stmt::child_iterator CallExpr::child_begin() { 2821 return &SubExprs[0]; 2822} 2823Stmt::child_iterator CallExpr::child_end() { 2824 return &SubExprs[0]+NumArgs+ARGS_START; 2825} 2826 2827// MemberExpr 2828Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2829Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2830 2831// ExtVectorElementExpr 2832Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2833Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2834 2835// CompoundLiteralExpr 2836Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2837Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2838 2839// CastExpr 2840Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2841Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2842 2843// BinaryOperator 2844Stmt::child_iterator BinaryOperator::child_begin() { 2845 return &SubExprs[0]; 2846} 2847Stmt::child_iterator BinaryOperator::child_end() { 2848 return &SubExprs[0]+END_EXPR; 2849} 2850 2851// ConditionalOperator 2852Stmt::child_iterator ConditionalOperator::child_begin() { 2853 return &SubExprs[0]; 2854} 2855Stmt::child_iterator ConditionalOperator::child_end() { 2856 return &SubExprs[0]+END_EXPR; 2857} 2858 2859// AddrLabelExpr 2860Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2861Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2862 2863// StmtExpr 2864Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2865Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2866 2867 2868// ChooseExpr 2869Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2870Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2871 2872// GNUNullExpr 2873Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2874Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2875 2876// ShuffleVectorExpr 2877Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2878 return &SubExprs[0]; 2879} 2880Stmt::child_iterator ShuffleVectorExpr::child_end() { 2881 return &SubExprs[0]+NumExprs; 2882} 2883 2884// VAArgExpr 2885Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2886Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2887 2888// InitListExpr 2889Stmt::child_iterator InitListExpr::child_begin() { 2890 return InitExprs.size() ? &InitExprs[0] : 0; 2891} 2892Stmt::child_iterator InitListExpr::child_end() { 2893 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2894} 2895 2896// DesignatedInitExpr 2897Stmt::child_iterator DesignatedInitExpr::child_begin() { 2898 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2899 Ptr += sizeof(DesignatedInitExpr); 2900 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2901} 2902Stmt::child_iterator DesignatedInitExpr::child_end() { 2903 return child_iterator(&*child_begin() + NumSubExprs); 2904} 2905 2906// ImplicitValueInitExpr 2907Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2908 return child_iterator(); 2909} 2910 2911Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2912 return child_iterator(); 2913} 2914 2915// ParenListExpr 2916Stmt::child_iterator ParenListExpr::child_begin() { 2917 return &Exprs[0]; 2918} 2919Stmt::child_iterator ParenListExpr::child_end() { 2920 return &Exprs[0]+NumExprs; 2921} 2922 2923// ObjCStringLiteral 2924Stmt::child_iterator ObjCStringLiteral::child_begin() { 2925 return &String; 2926} 2927Stmt::child_iterator ObjCStringLiteral::child_end() { 2928 return &String+1; 2929} 2930 2931// ObjCEncodeExpr 2932Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2933Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2934 2935// ObjCSelectorExpr 2936Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2937 return child_iterator(); 2938} 2939Stmt::child_iterator ObjCSelectorExpr::child_end() { 2940 return child_iterator(); 2941} 2942 2943// ObjCProtocolExpr 2944Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2945 return child_iterator(); 2946} 2947Stmt::child_iterator ObjCProtocolExpr::child_end() { 2948 return child_iterator(); 2949} 2950 2951// ObjCMessageExpr 2952Stmt::child_iterator ObjCMessageExpr::child_begin() { 2953 if (getReceiverKind() == Instance) 2954 return reinterpret_cast<Stmt **>(this + 1); 2955 return reinterpret_cast<Stmt **>(getArgs()); 2956} 2957Stmt::child_iterator ObjCMessageExpr::child_end() { 2958 return reinterpret_cast<Stmt **>(getArgs() + getNumArgs()); 2959} 2960 2961// Blocks 2962BlockDeclRefExpr::BlockDeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, 2963 SourceLocation l, bool ByRef, 2964 bool constAdded, Stmt *copyConstructorVal) 2965 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, 2966 d->isParameterPack()), 2967 D(d), Loc(l), IsByRef(ByRef), 2968 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) 2969{ 2970 bool TypeDependent = false; 2971 bool ValueDependent = false; 2972 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent); 2973 ExprBits.TypeDependent = TypeDependent; 2974 ExprBits.ValueDependent = ValueDependent; 2975} 2976 2977Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2978Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2979 2980Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2981Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2982 2983// OpaqueValueExpr 2984SourceRange OpaqueValueExpr::getSourceRange() const { return SourceRange(); } 2985Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } 2986Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); } 2987 2988