Expr.cpp revision 60618fa7f88d5162bb5b40988b6b38d4d75d6fc6
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 33/// isKnownToHaveBooleanValue - Return true if this is an integer expression 34/// that is known to return 0 or 1. This happens for _Bool/bool expressions 35/// but also int expressions which are produced by things like comparisons in 36/// C. 37bool Expr::isKnownToHaveBooleanValue() const { 38 // If this value has _Bool type, it is obvious 0/1. 39 if (getType()->isBooleanType()) return true; 40 // If this is a non-scalar-integer type, we don't care enough to try. 41 if (!getType()->isIntegralOrEnumerationType()) return false; 42 43 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 44 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 45 46 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 47 switch (UO->getOpcode()) { 48 case UO_Plus: 49 case UO_Extension: 50 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 51 default: 52 return false; 53 } 54 } 55 56 // Only look through implicit casts. If the user writes 57 // '(int) (a && b)' treat it as an arbitrary int. 58 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(this)) 59 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 60 61 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 62 switch (BO->getOpcode()) { 63 default: return false; 64 case BO_LT: // Relational operators. 65 case BO_GT: 66 case BO_LE: 67 case BO_GE: 68 case BO_EQ: // Equality operators. 69 case BO_NE: 70 case BO_LAnd: // AND operator. 71 case BO_LOr: // Logical OR operator. 72 return true; 73 74 case BO_And: // Bitwise AND operator. 75 case BO_Xor: // Bitwise XOR operator. 76 case BO_Or: // Bitwise OR operator. 77 // Handle things like (x==2)|(y==12). 78 return BO->getLHS()->isKnownToHaveBooleanValue() && 79 BO->getRHS()->isKnownToHaveBooleanValue(); 80 81 case BO_Comma: 82 case BO_Assign: 83 return BO->getRHS()->isKnownToHaveBooleanValue(); 84 } 85 } 86 87 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 88 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 89 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 90 91 return false; 92} 93 94// Amusing macro metaprogramming hack: check whether a class provides 95// a more specific implementation of getExprLoc(). 96namespace { 97 /// This implementation is used when a class provides a custom 98 /// implementation of getExprLoc. 99 template <class E, class T> 100 SourceLocation getExprLocImpl(const Expr *expr, 101 SourceLocation (T::*v)() const) { 102 return static_cast<const E*>(expr)->getExprLoc(); 103 } 104 105 /// This implementation is used when a class doesn't provide 106 /// a custom implementation of getExprLoc. Overload resolution 107 /// should pick it over the implementation above because it's 108 /// more specialized according to function template partial ordering. 109 template <class E> 110 SourceLocation getExprLocImpl(const Expr *expr, 111 SourceLocation (Expr::*v)() const) { 112 return static_cast<const E*>(expr)->getSourceRange().getBegin(); 113 } 114} 115 116SourceLocation Expr::getExprLoc() const { 117 switch (getStmtClass()) { 118 case Stmt::NoStmtClass: llvm_unreachable("statement without class"); 119#define ABSTRACT_STMT(type) 120#define STMT(type, base) \ 121 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break; 122#define EXPR(type, base) \ 123 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc); 124#include "clang/AST/StmtNodes.inc" 125 } 126 llvm_unreachable("unknown statement kind"); 127 return SourceLocation(); 128} 129 130//===----------------------------------------------------------------------===// 131// Primary Expressions. 132//===----------------------------------------------------------------------===// 133 134void ExplicitTemplateArgumentList::initializeFrom( 135 const TemplateArgumentListInfo &Info) { 136 LAngleLoc = Info.getLAngleLoc(); 137 RAngleLoc = Info.getRAngleLoc(); 138 NumTemplateArgs = Info.size(); 139 140 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 141 for (unsigned i = 0; i != NumTemplateArgs; ++i) 142 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 143} 144 145void ExplicitTemplateArgumentList::initializeFrom( 146 const TemplateArgumentListInfo &Info, 147 bool &Dependent, 148 bool &ContainsUnexpandedParameterPack) { 149 LAngleLoc = Info.getLAngleLoc(); 150 RAngleLoc = Info.getRAngleLoc(); 151 NumTemplateArgs = Info.size(); 152 153 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 154 for (unsigned i = 0; i != NumTemplateArgs; ++i) { 155 Dependent = Dependent || Info[i].getArgument().isDependent(); 156 ContainsUnexpandedParameterPack 157 = ContainsUnexpandedParameterPack || 158 Info[i].getArgument().containsUnexpandedParameterPack(); 159 160 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 161 } 162} 163 164void ExplicitTemplateArgumentList::copyInto( 165 TemplateArgumentListInfo &Info) const { 166 Info.setLAngleLoc(LAngleLoc); 167 Info.setRAngleLoc(RAngleLoc); 168 for (unsigned I = 0; I != NumTemplateArgs; ++I) 169 Info.addArgument(getTemplateArgs()[I]); 170} 171 172std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { 173 return sizeof(ExplicitTemplateArgumentList) + 174 sizeof(TemplateArgumentLoc) * NumTemplateArgs; 175} 176 177std::size_t ExplicitTemplateArgumentList::sizeFor( 178 const TemplateArgumentListInfo &Info) { 179 return sizeFor(Info.size()); 180} 181 182/// \brief Compute the type- and value-dependence of a declaration reference 183/// based on the declaration being referenced. 184static void computeDeclRefDependence(NamedDecl *D, QualType T, 185 bool &TypeDependent, 186 bool &ValueDependent) { 187 TypeDependent = false; 188 ValueDependent = false; 189 190 191 // (TD) C++ [temp.dep.expr]p3: 192 // An id-expression is type-dependent if it contains: 193 // 194 // and 195 // 196 // (VD) C++ [temp.dep.constexpr]p2: 197 // An identifier is value-dependent if it is: 198 199 // (TD) - an identifier that was declared with dependent type 200 // (VD) - a name declared with a dependent type, 201 if (T->isDependentType()) { 202 TypeDependent = true; 203 ValueDependent = true; 204 return; 205 } 206 207 // (TD) - a conversion-function-id that specifies a dependent type 208 if (D->getDeclName().getNameKind() 209 == DeclarationName::CXXConversionFunctionName && 210 D->getDeclName().getCXXNameType()->isDependentType()) { 211 TypeDependent = true; 212 ValueDependent = true; 213 return; 214 } 215 // (VD) - the name of a non-type template parameter, 216 if (isa<NonTypeTemplateParmDecl>(D)) { 217 ValueDependent = true; 218 return; 219 } 220 221 // (VD) - a constant with integral or enumeration type and is 222 // initialized with an expression that is value-dependent. 223 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 224 if (Var->getType()->isIntegralOrEnumerationType() && 225 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 226 if (const Expr *Init = Var->getAnyInitializer()) 227 if (Init->isValueDependent()) 228 ValueDependent = true; 229 } 230 231 // (VD) - FIXME: Missing from the standard: 232 // - a member function or a static data member of the current 233 // instantiation 234 else if (Var->isStaticDataMember() && 235 Var->getDeclContext()->isDependentContext()) 236 ValueDependent = true; 237 238 return; 239 } 240 241 // (VD) - FIXME: Missing from the standard: 242 // - a member function or a static data member of the current 243 // instantiation 244 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) { 245 ValueDependent = true; 246 return; 247 } 248} 249 250void DeclRefExpr::computeDependence() { 251 bool TypeDependent = false; 252 bool ValueDependent = false; 253 computeDeclRefDependence(getDecl(), getType(), TypeDependent, ValueDependent); 254 255 // (TD) C++ [temp.dep.expr]p3: 256 // An id-expression is type-dependent if it contains: 257 // 258 // and 259 // 260 // (VD) C++ [temp.dep.constexpr]p2: 261 // An identifier is value-dependent if it is: 262 if (!TypeDependent && !ValueDependent && 263 hasExplicitTemplateArgs() && 264 TemplateSpecializationType::anyDependentTemplateArguments( 265 getTemplateArgs(), 266 getNumTemplateArgs())) { 267 TypeDependent = true; 268 ValueDependent = true; 269 } 270 271 ExprBits.TypeDependent = TypeDependent; 272 ExprBits.ValueDependent = ValueDependent; 273 274 // Is the declaration a parameter pack? 275 if (getDecl()->isParameterPack()) 276 ExprBits.ContainsUnexpandedParameterPack = true; 277} 278 279DeclRefExpr::DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 280 ValueDecl *D, SourceLocation NameLoc, 281 const TemplateArgumentListInfo *TemplateArgs, 282 QualType T, ExprValueKind VK) 283 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 284 DecoratedD(D, 285 (QualifierLoc? HasQualifierFlag : 0) | 286 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 287 Loc(NameLoc) { 288 if (QualifierLoc) { 289 NameQualifier *NQ = getNameQualifier(); 290 NQ->QualifierLoc = QualifierLoc; 291 } 292 293 if (TemplateArgs) 294 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 295 296 computeDependence(); 297} 298 299DeclRefExpr::DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 300 ValueDecl *D, const DeclarationNameInfo &NameInfo, 301 const TemplateArgumentListInfo *TemplateArgs, 302 QualType T, ExprValueKind VK) 303 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 304 DecoratedD(D, 305 (QualifierLoc? HasQualifierFlag : 0) | 306 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 307 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 308 if (QualifierLoc) { 309 NameQualifier *NQ = getNameQualifier(); 310 NQ->QualifierLoc = QualifierLoc; 311 } 312 313 if (TemplateArgs) 314 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 315 316 computeDependence(); 317} 318 319DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 320 NestedNameSpecifierLoc QualifierLoc, 321 ValueDecl *D, 322 SourceLocation NameLoc, 323 QualType T, 324 ExprValueKind VK, 325 const TemplateArgumentListInfo *TemplateArgs) { 326 return Create(Context, QualifierLoc, D, 327 DeclarationNameInfo(D->getDeclName(), NameLoc), 328 T, VK, TemplateArgs); 329} 330 331DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 332 NestedNameSpecifierLoc QualifierLoc, 333 ValueDecl *D, 334 const DeclarationNameInfo &NameInfo, 335 QualType T, 336 ExprValueKind VK, 337 const TemplateArgumentListInfo *TemplateArgs) { 338 std::size_t Size = sizeof(DeclRefExpr); 339 if (QualifierLoc != 0) 340 Size += sizeof(NameQualifier); 341 342 if (TemplateArgs) 343 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 344 345 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 346 return new (Mem) DeclRefExpr(QualifierLoc, D, NameInfo, TemplateArgs, T, VK); 347} 348 349DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 350 bool HasQualifier, 351 bool HasExplicitTemplateArgs, 352 unsigned NumTemplateArgs) { 353 std::size_t Size = sizeof(DeclRefExpr); 354 if (HasQualifier) 355 Size += sizeof(NameQualifier); 356 357 if (HasExplicitTemplateArgs) 358 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 359 360 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 361 return new (Mem) DeclRefExpr(EmptyShell()); 362} 363 364SourceRange DeclRefExpr::getSourceRange() const { 365 SourceRange R = getNameInfo().getSourceRange(); 366 if (hasQualifier()) 367 R.setBegin(getQualifierLoc().getBeginLoc()); 368 if (hasExplicitTemplateArgs()) 369 R.setEnd(getRAngleLoc()); 370 return R; 371} 372 373// FIXME: Maybe this should use DeclPrinter with a special "print predefined 374// expr" policy instead. 375std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 376 ASTContext &Context = CurrentDecl->getASTContext(); 377 378 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 379 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 380 return FD->getNameAsString(); 381 382 llvm::SmallString<256> Name; 383 llvm::raw_svector_ostream Out(Name); 384 385 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 386 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 387 Out << "virtual "; 388 if (MD->isStatic()) 389 Out << "static "; 390 } 391 392 PrintingPolicy Policy(Context.getLangOptions()); 393 394 std::string Proto = FD->getQualifiedNameAsString(Policy); 395 396 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 397 const FunctionProtoType *FT = 0; 398 if (FD->hasWrittenPrototype()) 399 FT = dyn_cast<FunctionProtoType>(AFT); 400 401 Proto += "("; 402 if (FT) { 403 llvm::raw_string_ostream POut(Proto); 404 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 405 if (i) POut << ", "; 406 std::string Param; 407 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 408 POut << Param; 409 } 410 411 if (FT->isVariadic()) { 412 if (FD->getNumParams()) POut << ", "; 413 POut << "..."; 414 } 415 } 416 Proto += ")"; 417 418 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 419 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 420 if (ThisQuals.hasConst()) 421 Proto += " const"; 422 if (ThisQuals.hasVolatile()) 423 Proto += " volatile"; 424 } 425 426 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 427 AFT->getResultType().getAsStringInternal(Proto, Policy); 428 429 Out << Proto; 430 431 Out.flush(); 432 return Name.str().str(); 433 } 434 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 435 llvm::SmallString<256> Name; 436 llvm::raw_svector_ostream Out(Name); 437 Out << (MD->isInstanceMethod() ? '-' : '+'); 438 Out << '['; 439 440 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 441 // a null check to avoid a crash. 442 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 443 Out << ID; 444 445 if (const ObjCCategoryImplDecl *CID = 446 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 447 Out << '(' << CID << ')'; 448 449 Out << ' '; 450 Out << MD->getSelector().getAsString(); 451 Out << ']'; 452 453 Out.flush(); 454 return Name.str().str(); 455 } 456 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 457 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 458 return "top level"; 459 } 460 return ""; 461} 462 463void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 464 if (hasAllocation()) 465 C.Deallocate(pVal); 466 467 BitWidth = Val.getBitWidth(); 468 unsigned NumWords = Val.getNumWords(); 469 const uint64_t* Words = Val.getRawData(); 470 if (NumWords > 1) { 471 pVal = new (C) uint64_t[NumWords]; 472 std::copy(Words, Words + NumWords, pVal); 473 } else if (NumWords == 1) 474 VAL = Words[0]; 475 else 476 VAL = 0; 477} 478 479IntegerLiteral * 480IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 481 QualType type, SourceLocation l) { 482 return new (C) IntegerLiteral(C, V, type, l); 483} 484 485IntegerLiteral * 486IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 487 return new (C) IntegerLiteral(Empty); 488} 489 490FloatingLiteral * 491FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 492 bool isexact, QualType Type, SourceLocation L) { 493 return new (C) FloatingLiteral(C, V, isexact, Type, L); 494} 495 496FloatingLiteral * 497FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 498 return new (C) FloatingLiteral(Empty); 499} 500 501/// getValueAsApproximateDouble - This returns the value as an inaccurate 502/// double. Note that this may cause loss of precision, but is useful for 503/// debugging dumps, etc. 504double FloatingLiteral::getValueAsApproximateDouble() const { 505 llvm::APFloat V = getValue(); 506 bool ignored; 507 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 508 &ignored); 509 return V.convertToDouble(); 510} 511 512StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 513 unsigned ByteLength, bool Wide, 514 QualType Ty, 515 const SourceLocation *Loc, 516 unsigned NumStrs) { 517 // Allocate enough space for the StringLiteral plus an array of locations for 518 // any concatenated string tokens. 519 void *Mem = C.Allocate(sizeof(StringLiteral)+ 520 sizeof(SourceLocation)*(NumStrs-1), 521 llvm::alignOf<StringLiteral>()); 522 StringLiteral *SL = new (Mem) StringLiteral(Ty); 523 524 // OPTIMIZE: could allocate this appended to the StringLiteral. 525 char *AStrData = new (C, 1) char[ByteLength]; 526 memcpy(AStrData, StrData, ByteLength); 527 SL->StrData = AStrData; 528 SL->ByteLength = ByteLength; 529 SL->IsWide = Wide; 530 SL->TokLocs[0] = Loc[0]; 531 SL->NumConcatenated = NumStrs; 532 533 if (NumStrs != 1) 534 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 535 return SL; 536} 537 538StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 539 void *Mem = C.Allocate(sizeof(StringLiteral)+ 540 sizeof(SourceLocation)*(NumStrs-1), 541 llvm::alignOf<StringLiteral>()); 542 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 543 SL->StrData = 0; 544 SL->ByteLength = 0; 545 SL->NumConcatenated = NumStrs; 546 return SL; 547} 548 549void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 550 char *AStrData = new (C, 1) char[Str.size()]; 551 memcpy(AStrData, Str.data(), Str.size()); 552 StrData = AStrData; 553 ByteLength = Str.size(); 554} 555 556/// getLocationOfByte - Return a source location that points to the specified 557/// byte of this string literal. 558/// 559/// Strings are amazingly complex. They can be formed from multiple tokens and 560/// can have escape sequences in them in addition to the usual trigraph and 561/// escaped newline business. This routine handles this complexity. 562/// 563SourceLocation StringLiteral:: 564getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 565 const LangOptions &Features, const TargetInfo &Target) const { 566 assert(!isWide() && "This doesn't work for wide strings yet"); 567 568 // Loop over all of the tokens in this string until we find the one that 569 // contains the byte we're looking for. 570 unsigned TokNo = 0; 571 while (1) { 572 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 573 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 574 575 // Get the spelling of the string so that we can get the data that makes up 576 // the string literal, not the identifier for the macro it is potentially 577 // expanded through. 578 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 579 580 // Re-lex the token to get its length and original spelling. 581 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 582 bool Invalid = false; 583 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 584 if (Invalid) 585 return StrTokSpellingLoc; 586 587 const char *StrData = Buffer.data()+LocInfo.second; 588 589 // Create a langops struct and enable trigraphs. This is sufficient for 590 // relexing tokens. 591 LangOptions LangOpts; 592 LangOpts.Trigraphs = true; 593 594 // Create a lexer starting at the beginning of this token. 595 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 596 Buffer.end()); 597 Token TheTok; 598 TheLexer.LexFromRawLexer(TheTok); 599 600 // Use the StringLiteralParser to compute the length of the string in bytes. 601 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 602 unsigned TokNumBytes = SLP.GetStringLength(); 603 604 // If the byte is in this token, return the location of the byte. 605 if (ByteNo < TokNumBytes || 606 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 607 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 608 609 // Now that we know the offset of the token in the spelling, use the 610 // preprocessor to get the offset in the original source. 611 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 612 } 613 614 // Move to the next string token. 615 ++TokNo; 616 ByteNo -= TokNumBytes; 617 } 618} 619 620 621 622/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 623/// corresponds to, e.g. "sizeof" or "[pre]++". 624const char *UnaryOperator::getOpcodeStr(Opcode Op) { 625 switch (Op) { 626 default: assert(0 && "Unknown unary operator"); 627 case UO_PostInc: return "++"; 628 case UO_PostDec: return "--"; 629 case UO_PreInc: return "++"; 630 case UO_PreDec: return "--"; 631 case UO_AddrOf: return "&"; 632 case UO_Deref: return "*"; 633 case UO_Plus: return "+"; 634 case UO_Minus: return "-"; 635 case UO_Not: return "~"; 636 case UO_LNot: return "!"; 637 case UO_Real: return "__real"; 638 case UO_Imag: return "__imag"; 639 case UO_Extension: return "__extension__"; 640 } 641} 642 643UnaryOperatorKind 644UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 645 switch (OO) { 646 default: assert(false && "No unary operator for overloaded function"); 647 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 648 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 649 case OO_Amp: return UO_AddrOf; 650 case OO_Star: return UO_Deref; 651 case OO_Plus: return UO_Plus; 652 case OO_Minus: return UO_Minus; 653 case OO_Tilde: return UO_Not; 654 case OO_Exclaim: return UO_LNot; 655 } 656} 657 658OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 659 switch (Opc) { 660 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 661 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 662 case UO_AddrOf: return OO_Amp; 663 case UO_Deref: return OO_Star; 664 case UO_Plus: return OO_Plus; 665 case UO_Minus: return OO_Minus; 666 case UO_Not: return OO_Tilde; 667 case UO_LNot: return OO_Exclaim; 668 default: return OO_None; 669 } 670} 671 672 673//===----------------------------------------------------------------------===// 674// Postfix Operators. 675//===----------------------------------------------------------------------===// 676 677CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 678 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 679 SourceLocation rparenloc) 680 : Expr(SC, t, VK, OK_Ordinary, 681 fn->isTypeDependent(), 682 fn->isValueDependent(), 683 fn->containsUnexpandedParameterPack()), 684 NumArgs(numargs) { 685 686 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 687 SubExprs[FN] = fn; 688 for (unsigned i = 0; i != numargs; ++i) { 689 if (args[i]->isTypeDependent()) 690 ExprBits.TypeDependent = true; 691 if (args[i]->isValueDependent()) 692 ExprBits.ValueDependent = true; 693 if (args[i]->containsUnexpandedParameterPack()) 694 ExprBits.ContainsUnexpandedParameterPack = true; 695 696 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 697 } 698 699 CallExprBits.NumPreArgs = NumPreArgs; 700 RParenLoc = rparenloc; 701} 702 703CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 704 QualType t, ExprValueKind VK, SourceLocation rparenloc) 705 : Expr(CallExprClass, t, VK, OK_Ordinary, 706 fn->isTypeDependent(), 707 fn->isValueDependent(), 708 fn->containsUnexpandedParameterPack()), 709 NumArgs(numargs) { 710 711 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 712 SubExprs[FN] = fn; 713 for (unsigned i = 0; i != numargs; ++i) { 714 if (args[i]->isTypeDependent()) 715 ExprBits.TypeDependent = true; 716 if (args[i]->isValueDependent()) 717 ExprBits.ValueDependent = true; 718 if (args[i]->containsUnexpandedParameterPack()) 719 ExprBits.ContainsUnexpandedParameterPack = true; 720 721 SubExprs[i+PREARGS_START] = args[i]; 722 } 723 724 CallExprBits.NumPreArgs = 0; 725 RParenLoc = rparenloc; 726} 727 728CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 729 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 730 // FIXME: Why do we allocate this? 731 SubExprs = new (C) Stmt*[PREARGS_START]; 732 CallExprBits.NumPreArgs = 0; 733} 734 735CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 736 EmptyShell Empty) 737 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 738 // FIXME: Why do we allocate this? 739 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 740 CallExprBits.NumPreArgs = NumPreArgs; 741} 742 743Decl *CallExpr::getCalleeDecl() { 744 Expr *CEE = getCallee()->IgnoreParenCasts(); 745 // If we're calling a dereference, look at the pointer instead. 746 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 747 if (BO->isPtrMemOp()) 748 CEE = BO->getRHS()->IgnoreParenCasts(); 749 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 750 if (UO->getOpcode() == UO_Deref) 751 CEE = UO->getSubExpr()->IgnoreParenCasts(); 752 } 753 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 754 return DRE->getDecl(); 755 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 756 return ME->getMemberDecl(); 757 758 return 0; 759} 760 761FunctionDecl *CallExpr::getDirectCallee() { 762 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 763} 764 765/// setNumArgs - This changes the number of arguments present in this call. 766/// Any orphaned expressions are deleted by this, and any new operands are set 767/// to null. 768void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 769 // No change, just return. 770 if (NumArgs == getNumArgs()) return; 771 772 // If shrinking # arguments, just delete the extras and forgot them. 773 if (NumArgs < getNumArgs()) { 774 this->NumArgs = NumArgs; 775 return; 776 } 777 778 // Otherwise, we are growing the # arguments. New an bigger argument array. 779 unsigned NumPreArgs = getNumPreArgs(); 780 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 781 // Copy over args. 782 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 783 NewSubExprs[i] = SubExprs[i]; 784 // Null out new args. 785 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 786 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 787 NewSubExprs[i] = 0; 788 789 if (SubExprs) C.Deallocate(SubExprs); 790 SubExprs = NewSubExprs; 791 this->NumArgs = NumArgs; 792} 793 794/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 795/// not, return 0. 796unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const { 797 // All simple function calls (e.g. func()) are implicitly cast to pointer to 798 // function. As a result, we try and obtain the DeclRefExpr from the 799 // ImplicitCastExpr. 800 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 801 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 802 return 0; 803 804 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 805 if (!DRE) 806 return 0; 807 808 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 809 if (!FDecl) 810 return 0; 811 812 if (!FDecl->getIdentifier()) 813 return 0; 814 815 return FDecl->getBuiltinID(); 816} 817 818QualType CallExpr::getCallReturnType() const { 819 QualType CalleeType = getCallee()->getType(); 820 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 821 CalleeType = FnTypePtr->getPointeeType(); 822 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 823 CalleeType = BPT->getPointeeType(); 824 else if (const MemberPointerType *MPT 825 = CalleeType->getAs<MemberPointerType>()) 826 CalleeType = MPT->getPointeeType(); 827 828 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 829 return FnType->getResultType(); 830} 831 832SourceRange CallExpr::getSourceRange() const { 833 if (isa<CXXOperatorCallExpr>(this)) 834 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 835 836 SourceLocation begin = getCallee()->getLocStart(); 837 if (begin.isInvalid() && getNumArgs() > 0) 838 begin = getArg(0)->getLocStart(); 839 SourceLocation end = getRParenLoc(); 840 if (end.isInvalid() && getNumArgs() > 0) 841 end = getArg(getNumArgs() - 1)->getLocEnd(); 842 return SourceRange(begin, end); 843} 844 845OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 846 SourceLocation OperatorLoc, 847 TypeSourceInfo *tsi, 848 OffsetOfNode* compsPtr, unsigned numComps, 849 Expr** exprsPtr, unsigned numExprs, 850 SourceLocation RParenLoc) { 851 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 852 sizeof(OffsetOfNode) * numComps + 853 sizeof(Expr*) * numExprs); 854 855 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 856 exprsPtr, numExprs, RParenLoc); 857} 858 859OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 860 unsigned numComps, unsigned numExprs) { 861 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 862 sizeof(OffsetOfNode) * numComps + 863 sizeof(Expr*) * numExprs); 864 return new (Mem) OffsetOfExpr(numComps, numExprs); 865} 866 867OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 868 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 869 OffsetOfNode* compsPtr, unsigned numComps, 870 Expr** exprsPtr, unsigned numExprs, 871 SourceLocation RParenLoc) 872 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 873 /*TypeDependent=*/false, 874 /*ValueDependent=*/tsi->getType()->isDependentType(), 875 tsi->getType()->containsUnexpandedParameterPack()), 876 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 877 NumComps(numComps), NumExprs(numExprs) 878{ 879 for(unsigned i = 0; i < numComps; ++i) { 880 setComponent(i, compsPtr[i]); 881 } 882 883 for(unsigned i = 0; i < numExprs; ++i) { 884 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 885 ExprBits.ValueDependent = true; 886 if (exprsPtr[i]->containsUnexpandedParameterPack()) 887 ExprBits.ContainsUnexpandedParameterPack = true; 888 889 setIndexExpr(i, exprsPtr[i]); 890 } 891} 892 893IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 894 assert(getKind() == Field || getKind() == Identifier); 895 if (getKind() == Field) 896 return getField()->getIdentifier(); 897 898 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 899} 900 901MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 902 NestedNameSpecifierLoc QualifierLoc, 903 ValueDecl *memberdecl, 904 DeclAccessPair founddecl, 905 DeclarationNameInfo nameinfo, 906 const TemplateArgumentListInfo *targs, 907 QualType ty, 908 ExprValueKind vk, 909 ExprObjectKind ok) { 910 std::size_t Size = sizeof(MemberExpr); 911 912 bool hasQualOrFound = (QualifierLoc || 913 founddecl.getDecl() != memberdecl || 914 founddecl.getAccess() != memberdecl->getAccess()); 915 if (hasQualOrFound) 916 Size += sizeof(MemberNameQualifier); 917 918 if (targs) 919 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 920 921 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 922 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 923 ty, vk, ok); 924 925 if (hasQualOrFound) { 926 // FIXME: Wrong. We should be looking at the member declaration we found. 927 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 928 E->setValueDependent(true); 929 E->setTypeDependent(true); 930 } 931 E->HasQualifierOrFoundDecl = true; 932 933 MemberNameQualifier *NQ = E->getMemberQualifier(); 934 NQ->QualifierLoc = QualifierLoc; 935 NQ->FoundDecl = founddecl; 936 } 937 938 if (targs) { 939 E->HasExplicitTemplateArgumentList = true; 940 E->getExplicitTemplateArgs().initializeFrom(*targs); 941 } 942 943 return E; 944} 945 946SourceRange MemberExpr::getSourceRange() const { 947 SourceLocation StartLoc; 948 if (isImplicitAccess()) { 949 if (hasQualifier()) 950 StartLoc = getQualifierLoc().getBeginLoc(); 951 else 952 StartLoc = MemberLoc; 953 } else { 954 // FIXME: We don't want this to happen. Rather, we should be able to 955 // detect all kinds of implicit accesses more cleanly. 956 StartLoc = getBase()->getLocStart(); 957 if (StartLoc.isInvalid()) 958 StartLoc = MemberLoc; 959 } 960 961 SourceLocation EndLoc = 962 HasExplicitTemplateArgumentList? getRAngleLoc() 963 : getMemberNameInfo().getEndLoc(); 964 965 return SourceRange(StartLoc, EndLoc); 966} 967 968const char *CastExpr::getCastKindName() const { 969 switch (getCastKind()) { 970 case CK_Dependent: 971 return "Dependent"; 972 case CK_BitCast: 973 return "BitCast"; 974 case CK_LValueBitCast: 975 return "LValueBitCast"; 976 case CK_LValueToRValue: 977 return "LValueToRValue"; 978 case CK_GetObjCProperty: 979 return "GetObjCProperty"; 980 case CK_NoOp: 981 return "NoOp"; 982 case CK_BaseToDerived: 983 return "BaseToDerived"; 984 case CK_DerivedToBase: 985 return "DerivedToBase"; 986 case CK_UncheckedDerivedToBase: 987 return "UncheckedDerivedToBase"; 988 case CK_Dynamic: 989 return "Dynamic"; 990 case CK_ToUnion: 991 return "ToUnion"; 992 case CK_ArrayToPointerDecay: 993 return "ArrayToPointerDecay"; 994 case CK_FunctionToPointerDecay: 995 return "FunctionToPointerDecay"; 996 case CK_NullToMemberPointer: 997 return "NullToMemberPointer"; 998 case CK_NullToPointer: 999 return "NullToPointer"; 1000 case CK_BaseToDerivedMemberPointer: 1001 return "BaseToDerivedMemberPointer"; 1002 case CK_DerivedToBaseMemberPointer: 1003 return "DerivedToBaseMemberPointer"; 1004 case CK_UserDefinedConversion: 1005 return "UserDefinedConversion"; 1006 case CK_ConstructorConversion: 1007 return "ConstructorConversion"; 1008 case CK_IntegralToPointer: 1009 return "IntegralToPointer"; 1010 case CK_PointerToIntegral: 1011 return "PointerToIntegral"; 1012 case CK_PointerToBoolean: 1013 return "PointerToBoolean"; 1014 case CK_ToVoid: 1015 return "ToVoid"; 1016 case CK_VectorSplat: 1017 return "VectorSplat"; 1018 case CK_IntegralCast: 1019 return "IntegralCast"; 1020 case CK_IntegralToBoolean: 1021 return "IntegralToBoolean"; 1022 case CK_IntegralToFloating: 1023 return "IntegralToFloating"; 1024 case CK_FloatingToIntegral: 1025 return "FloatingToIntegral"; 1026 case CK_FloatingCast: 1027 return "FloatingCast"; 1028 case CK_FloatingToBoolean: 1029 return "FloatingToBoolean"; 1030 case CK_MemberPointerToBoolean: 1031 return "MemberPointerToBoolean"; 1032 case CK_AnyPointerToObjCPointerCast: 1033 return "AnyPointerToObjCPointerCast"; 1034 case CK_AnyPointerToBlockPointerCast: 1035 return "AnyPointerToBlockPointerCast"; 1036 case CK_ObjCObjectLValueCast: 1037 return "ObjCObjectLValueCast"; 1038 case CK_FloatingRealToComplex: 1039 return "FloatingRealToComplex"; 1040 case CK_FloatingComplexToReal: 1041 return "FloatingComplexToReal"; 1042 case CK_FloatingComplexToBoolean: 1043 return "FloatingComplexToBoolean"; 1044 case CK_FloatingComplexCast: 1045 return "FloatingComplexCast"; 1046 case CK_FloatingComplexToIntegralComplex: 1047 return "FloatingComplexToIntegralComplex"; 1048 case CK_IntegralRealToComplex: 1049 return "IntegralRealToComplex"; 1050 case CK_IntegralComplexToReal: 1051 return "IntegralComplexToReal"; 1052 case CK_IntegralComplexToBoolean: 1053 return "IntegralComplexToBoolean"; 1054 case CK_IntegralComplexCast: 1055 return "IntegralComplexCast"; 1056 case CK_IntegralComplexToFloatingComplex: 1057 return "IntegralComplexToFloatingComplex"; 1058 } 1059 1060 llvm_unreachable("Unhandled cast kind!"); 1061 return 0; 1062} 1063 1064Expr *CastExpr::getSubExprAsWritten() { 1065 Expr *SubExpr = 0; 1066 CastExpr *E = this; 1067 do { 1068 SubExpr = E->getSubExpr(); 1069 1070 // Skip any temporary bindings; they're implicit. 1071 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1072 SubExpr = Binder->getSubExpr(); 1073 1074 // Conversions by constructor and conversion functions have a 1075 // subexpression describing the call; strip it off. 1076 if (E->getCastKind() == CK_ConstructorConversion) 1077 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1078 else if (E->getCastKind() == CK_UserDefinedConversion) 1079 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1080 1081 // If the subexpression we're left with is an implicit cast, look 1082 // through that, too. 1083 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1084 1085 return SubExpr; 1086} 1087 1088CXXBaseSpecifier **CastExpr::path_buffer() { 1089 switch (getStmtClass()) { 1090#define ABSTRACT_STMT(x) 1091#define CASTEXPR(Type, Base) \ 1092 case Stmt::Type##Class: \ 1093 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1094#define STMT(Type, Base) 1095#include "clang/AST/StmtNodes.inc" 1096 default: 1097 llvm_unreachable("non-cast expressions not possible here"); 1098 return 0; 1099 } 1100} 1101 1102void CastExpr::setCastPath(const CXXCastPath &Path) { 1103 assert(Path.size() == path_size()); 1104 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1105} 1106 1107ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1108 CastKind Kind, Expr *Operand, 1109 const CXXCastPath *BasePath, 1110 ExprValueKind VK) { 1111 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1112 void *Buffer = 1113 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1114 ImplicitCastExpr *E = 1115 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1116 if (PathSize) E->setCastPath(*BasePath); 1117 return E; 1118} 1119 1120ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1121 unsigned PathSize) { 1122 void *Buffer = 1123 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1124 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1125} 1126 1127 1128CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1129 ExprValueKind VK, CastKind K, Expr *Op, 1130 const CXXCastPath *BasePath, 1131 TypeSourceInfo *WrittenTy, 1132 SourceLocation L, SourceLocation R) { 1133 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1134 void *Buffer = 1135 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1136 CStyleCastExpr *E = 1137 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1138 if (PathSize) E->setCastPath(*BasePath); 1139 return E; 1140} 1141 1142CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1143 void *Buffer = 1144 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1145 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1146} 1147 1148/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1149/// corresponds to, e.g. "<<=". 1150const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1151 switch (Op) { 1152 case BO_PtrMemD: return ".*"; 1153 case BO_PtrMemI: return "->*"; 1154 case BO_Mul: return "*"; 1155 case BO_Div: return "/"; 1156 case BO_Rem: return "%"; 1157 case BO_Add: return "+"; 1158 case BO_Sub: return "-"; 1159 case BO_Shl: return "<<"; 1160 case BO_Shr: return ">>"; 1161 case BO_LT: return "<"; 1162 case BO_GT: return ">"; 1163 case BO_LE: return "<="; 1164 case BO_GE: return ">="; 1165 case BO_EQ: return "=="; 1166 case BO_NE: return "!="; 1167 case BO_And: return "&"; 1168 case BO_Xor: return "^"; 1169 case BO_Or: return "|"; 1170 case BO_LAnd: return "&&"; 1171 case BO_LOr: return "||"; 1172 case BO_Assign: return "="; 1173 case BO_MulAssign: return "*="; 1174 case BO_DivAssign: return "/="; 1175 case BO_RemAssign: return "%="; 1176 case BO_AddAssign: return "+="; 1177 case BO_SubAssign: return "-="; 1178 case BO_ShlAssign: return "<<="; 1179 case BO_ShrAssign: return ">>="; 1180 case BO_AndAssign: return "&="; 1181 case BO_XorAssign: return "^="; 1182 case BO_OrAssign: return "|="; 1183 case BO_Comma: return ","; 1184 } 1185 1186 return ""; 1187} 1188 1189BinaryOperatorKind 1190BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1191 switch (OO) { 1192 default: assert(false && "Not an overloadable binary operator"); 1193 case OO_Plus: return BO_Add; 1194 case OO_Minus: return BO_Sub; 1195 case OO_Star: return BO_Mul; 1196 case OO_Slash: return BO_Div; 1197 case OO_Percent: return BO_Rem; 1198 case OO_Caret: return BO_Xor; 1199 case OO_Amp: return BO_And; 1200 case OO_Pipe: return BO_Or; 1201 case OO_Equal: return BO_Assign; 1202 case OO_Less: return BO_LT; 1203 case OO_Greater: return BO_GT; 1204 case OO_PlusEqual: return BO_AddAssign; 1205 case OO_MinusEqual: return BO_SubAssign; 1206 case OO_StarEqual: return BO_MulAssign; 1207 case OO_SlashEqual: return BO_DivAssign; 1208 case OO_PercentEqual: return BO_RemAssign; 1209 case OO_CaretEqual: return BO_XorAssign; 1210 case OO_AmpEqual: return BO_AndAssign; 1211 case OO_PipeEqual: return BO_OrAssign; 1212 case OO_LessLess: return BO_Shl; 1213 case OO_GreaterGreater: return BO_Shr; 1214 case OO_LessLessEqual: return BO_ShlAssign; 1215 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1216 case OO_EqualEqual: return BO_EQ; 1217 case OO_ExclaimEqual: return BO_NE; 1218 case OO_LessEqual: return BO_LE; 1219 case OO_GreaterEqual: return BO_GE; 1220 case OO_AmpAmp: return BO_LAnd; 1221 case OO_PipePipe: return BO_LOr; 1222 case OO_Comma: return BO_Comma; 1223 case OO_ArrowStar: return BO_PtrMemI; 1224 } 1225} 1226 1227OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1228 static const OverloadedOperatorKind OverOps[] = { 1229 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1230 OO_Star, OO_Slash, OO_Percent, 1231 OO_Plus, OO_Minus, 1232 OO_LessLess, OO_GreaterGreater, 1233 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1234 OO_EqualEqual, OO_ExclaimEqual, 1235 OO_Amp, 1236 OO_Caret, 1237 OO_Pipe, 1238 OO_AmpAmp, 1239 OO_PipePipe, 1240 OO_Equal, OO_StarEqual, 1241 OO_SlashEqual, OO_PercentEqual, 1242 OO_PlusEqual, OO_MinusEqual, 1243 OO_LessLessEqual, OO_GreaterGreaterEqual, 1244 OO_AmpEqual, OO_CaretEqual, 1245 OO_PipeEqual, 1246 OO_Comma 1247 }; 1248 return OverOps[Opc]; 1249} 1250 1251InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1252 Expr **initExprs, unsigned numInits, 1253 SourceLocation rbraceloc) 1254 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1255 false), 1256 InitExprs(C, numInits), 1257 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1258 UnionFieldInit(0), HadArrayRangeDesignator(false) 1259{ 1260 for (unsigned I = 0; I != numInits; ++I) { 1261 if (initExprs[I]->isTypeDependent()) 1262 ExprBits.TypeDependent = true; 1263 if (initExprs[I]->isValueDependent()) 1264 ExprBits.ValueDependent = true; 1265 if (initExprs[I]->containsUnexpandedParameterPack()) 1266 ExprBits.ContainsUnexpandedParameterPack = true; 1267 } 1268 1269 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1270} 1271 1272void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1273 if (NumInits > InitExprs.size()) 1274 InitExprs.reserve(C, NumInits); 1275} 1276 1277void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1278 InitExprs.resize(C, NumInits, 0); 1279} 1280 1281Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1282 if (Init >= InitExprs.size()) { 1283 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1284 InitExprs.back() = expr; 1285 return 0; 1286 } 1287 1288 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1289 InitExprs[Init] = expr; 1290 return Result; 1291} 1292 1293SourceRange InitListExpr::getSourceRange() const { 1294 if (SyntacticForm) 1295 return SyntacticForm->getSourceRange(); 1296 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1297 if (Beg.isInvalid()) { 1298 // Find the first non-null initializer. 1299 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1300 E = InitExprs.end(); 1301 I != E; ++I) { 1302 if (Stmt *S = *I) { 1303 Beg = S->getLocStart(); 1304 break; 1305 } 1306 } 1307 } 1308 if (End.isInvalid()) { 1309 // Find the first non-null initializer from the end. 1310 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1311 E = InitExprs.rend(); 1312 I != E; ++I) { 1313 if (Stmt *S = *I) { 1314 End = S->getSourceRange().getEnd(); 1315 break; 1316 } 1317 } 1318 } 1319 return SourceRange(Beg, End); 1320} 1321 1322/// getFunctionType - Return the underlying function type for this block. 1323/// 1324const FunctionType *BlockExpr::getFunctionType() const { 1325 return getType()->getAs<BlockPointerType>()-> 1326 getPointeeType()->getAs<FunctionType>(); 1327} 1328 1329SourceLocation BlockExpr::getCaretLocation() const { 1330 return TheBlock->getCaretLocation(); 1331} 1332const Stmt *BlockExpr::getBody() const { 1333 return TheBlock->getBody(); 1334} 1335Stmt *BlockExpr::getBody() { 1336 return TheBlock->getBody(); 1337} 1338 1339 1340//===----------------------------------------------------------------------===// 1341// Generic Expression Routines 1342//===----------------------------------------------------------------------===// 1343 1344/// isUnusedResultAWarning - Return true if this immediate expression should 1345/// be warned about if the result is unused. If so, fill in Loc and Ranges 1346/// with location to warn on and the source range[s] to report with the 1347/// warning. 1348bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1349 SourceRange &R2, ASTContext &Ctx) const { 1350 // Don't warn if the expr is type dependent. The type could end up 1351 // instantiating to void. 1352 if (isTypeDependent()) 1353 return false; 1354 1355 switch (getStmtClass()) { 1356 default: 1357 if (getType()->isVoidType()) 1358 return false; 1359 Loc = getExprLoc(); 1360 R1 = getSourceRange(); 1361 return true; 1362 case ParenExprClass: 1363 return cast<ParenExpr>(this)->getSubExpr()-> 1364 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1365 case UnaryOperatorClass: { 1366 const UnaryOperator *UO = cast<UnaryOperator>(this); 1367 1368 switch (UO->getOpcode()) { 1369 default: break; 1370 case UO_PostInc: 1371 case UO_PostDec: 1372 case UO_PreInc: 1373 case UO_PreDec: // ++/-- 1374 return false; // Not a warning. 1375 case UO_Deref: 1376 // Dereferencing a volatile pointer is a side-effect. 1377 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1378 return false; 1379 break; 1380 case UO_Real: 1381 case UO_Imag: 1382 // accessing a piece of a volatile complex is a side-effect. 1383 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1384 .isVolatileQualified()) 1385 return false; 1386 break; 1387 case UO_Extension: 1388 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1389 } 1390 Loc = UO->getOperatorLoc(); 1391 R1 = UO->getSubExpr()->getSourceRange(); 1392 return true; 1393 } 1394 case BinaryOperatorClass: { 1395 const BinaryOperator *BO = cast<BinaryOperator>(this); 1396 switch (BO->getOpcode()) { 1397 default: 1398 break; 1399 // Consider the RHS of comma for side effects. LHS was checked by 1400 // Sema::CheckCommaOperands. 1401 case BO_Comma: 1402 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1403 // lvalue-ness) of an assignment written in a macro. 1404 if (IntegerLiteral *IE = 1405 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1406 if (IE->getValue() == 0) 1407 return false; 1408 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1409 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1410 case BO_LAnd: 1411 case BO_LOr: 1412 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1413 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1414 return false; 1415 break; 1416 } 1417 if (BO->isAssignmentOp()) 1418 return false; 1419 Loc = BO->getOperatorLoc(); 1420 R1 = BO->getLHS()->getSourceRange(); 1421 R2 = BO->getRHS()->getSourceRange(); 1422 return true; 1423 } 1424 case CompoundAssignOperatorClass: 1425 case VAArgExprClass: 1426 return false; 1427 1428 case ConditionalOperatorClass: { 1429 // If only one of the LHS or RHS is a warning, the operator might 1430 // be being used for control flow. Only warn if both the LHS and 1431 // RHS are warnings. 1432 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1433 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1434 return false; 1435 if (!Exp->getLHS()) 1436 return true; 1437 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1438 } 1439 1440 case MemberExprClass: 1441 // If the base pointer or element is to a volatile pointer/field, accessing 1442 // it is a side effect. 1443 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1444 return false; 1445 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1446 R1 = SourceRange(Loc, Loc); 1447 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1448 return true; 1449 1450 case ArraySubscriptExprClass: 1451 // If the base pointer or element is to a volatile pointer/field, accessing 1452 // it is a side effect. 1453 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1454 return false; 1455 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1456 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1457 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1458 return true; 1459 1460 case CallExprClass: 1461 case CXXOperatorCallExprClass: 1462 case CXXMemberCallExprClass: { 1463 // If this is a direct call, get the callee. 1464 const CallExpr *CE = cast<CallExpr>(this); 1465 if (const Decl *FD = CE->getCalleeDecl()) { 1466 // If the callee has attribute pure, const, or warn_unused_result, warn 1467 // about it. void foo() { strlen("bar"); } should warn. 1468 // 1469 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1470 // updated to match for QoI. 1471 if (FD->getAttr<WarnUnusedResultAttr>() || 1472 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1473 Loc = CE->getCallee()->getLocStart(); 1474 R1 = CE->getCallee()->getSourceRange(); 1475 1476 if (unsigned NumArgs = CE->getNumArgs()) 1477 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1478 CE->getArg(NumArgs-1)->getLocEnd()); 1479 return true; 1480 } 1481 } 1482 return false; 1483 } 1484 1485 case CXXTemporaryObjectExprClass: 1486 case CXXConstructExprClass: 1487 return false; 1488 1489 case ObjCMessageExprClass: { 1490 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1491 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1492 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1493 Loc = getExprLoc(); 1494 return true; 1495 } 1496 return false; 1497 } 1498 1499 case ObjCPropertyRefExprClass: 1500 Loc = getExprLoc(); 1501 R1 = getSourceRange(); 1502 return true; 1503 1504 case StmtExprClass: { 1505 // Statement exprs don't logically have side effects themselves, but are 1506 // sometimes used in macros in ways that give them a type that is unused. 1507 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1508 // however, if the result of the stmt expr is dead, we don't want to emit a 1509 // warning. 1510 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1511 if (!CS->body_empty()) { 1512 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1513 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1514 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1515 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1516 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1517 } 1518 1519 if (getType()->isVoidType()) 1520 return false; 1521 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1522 R1 = getSourceRange(); 1523 return true; 1524 } 1525 case CStyleCastExprClass: 1526 // If this is an explicit cast to void, allow it. People do this when they 1527 // think they know what they're doing :). 1528 if (getType()->isVoidType()) 1529 return false; 1530 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1531 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1532 return true; 1533 case CXXFunctionalCastExprClass: { 1534 if (getType()->isVoidType()) 1535 return false; 1536 const CastExpr *CE = cast<CastExpr>(this); 1537 1538 // If this is a cast to void or a constructor conversion, check the operand. 1539 // Otherwise, the result of the cast is unused. 1540 if (CE->getCastKind() == CK_ToVoid || 1541 CE->getCastKind() == CK_ConstructorConversion) 1542 return (cast<CastExpr>(this)->getSubExpr() 1543 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1544 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1545 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1546 return true; 1547 } 1548 1549 case ImplicitCastExprClass: 1550 // Check the operand, since implicit casts are inserted by Sema 1551 return (cast<ImplicitCastExpr>(this) 1552 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1553 1554 case CXXDefaultArgExprClass: 1555 return (cast<CXXDefaultArgExpr>(this) 1556 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1557 1558 case CXXNewExprClass: 1559 // FIXME: In theory, there might be new expressions that don't have side 1560 // effects (e.g. a placement new with an uninitialized POD). 1561 case CXXDeleteExprClass: 1562 return false; 1563 case CXXBindTemporaryExprClass: 1564 return (cast<CXXBindTemporaryExpr>(this) 1565 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1566 case ExprWithCleanupsClass: 1567 return (cast<ExprWithCleanups>(this) 1568 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1569 } 1570} 1571 1572/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1573/// returns true, if it is; false otherwise. 1574bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1575 switch (getStmtClass()) { 1576 default: 1577 return false; 1578 case ObjCIvarRefExprClass: 1579 return true; 1580 case Expr::UnaryOperatorClass: 1581 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1582 case ParenExprClass: 1583 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1584 case ImplicitCastExprClass: 1585 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1586 case CStyleCastExprClass: 1587 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1588 case DeclRefExprClass: { 1589 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1590 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1591 if (VD->hasGlobalStorage()) 1592 return true; 1593 QualType T = VD->getType(); 1594 // dereferencing to a pointer is always a gc'able candidate, 1595 // unless it is __weak. 1596 return T->isPointerType() && 1597 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1598 } 1599 return false; 1600 } 1601 case MemberExprClass: { 1602 const MemberExpr *M = cast<MemberExpr>(this); 1603 return M->getBase()->isOBJCGCCandidate(Ctx); 1604 } 1605 case ArraySubscriptExprClass: 1606 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1607 } 1608} 1609 1610bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1611 if (isTypeDependent()) 1612 return false; 1613 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1614} 1615 1616static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1617 Expr::CanThrowResult CT2) { 1618 // CanThrowResult constants are ordered so that the maximum is the correct 1619 // merge result. 1620 return CT1 > CT2 ? CT1 : CT2; 1621} 1622 1623static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1624 Expr *E = const_cast<Expr*>(CE); 1625 Expr::CanThrowResult R = Expr::CT_Cannot; 1626 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1627 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1628 } 1629 return R; 1630} 1631 1632static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1633 bool NullThrows = true) { 1634 if (!D) 1635 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1636 1637 // See if we can get a function type from the decl somehow. 1638 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1639 if (!VD) // If we have no clue what we're calling, assume the worst. 1640 return Expr::CT_Can; 1641 1642 // As an extension, we assume that __attribute__((nothrow)) functions don't 1643 // throw. 1644 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1645 return Expr::CT_Cannot; 1646 1647 QualType T = VD->getType(); 1648 const FunctionProtoType *FT; 1649 if ((FT = T->getAs<FunctionProtoType>())) { 1650 } else if (const PointerType *PT = T->getAs<PointerType>()) 1651 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1652 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1653 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1654 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1655 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1656 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1657 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1658 1659 if (!FT) 1660 return Expr::CT_Can; 1661 1662 return FT->isNothrow() ? Expr::CT_Cannot : Expr::CT_Can; 1663} 1664 1665static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1666 if (DC->isTypeDependent()) 1667 return Expr::CT_Dependent; 1668 1669 if (!DC->getTypeAsWritten()->isReferenceType()) 1670 return Expr::CT_Cannot; 1671 1672 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1673} 1674 1675static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1676 const CXXTypeidExpr *DC) { 1677 if (DC->isTypeOperand()) 1678 return Expr::CT_Cannot; 1679 1680 Expr *Op = DC->getExprOperand(); 1681 if (Op->isTypeDependent()) 1682 return Expr::CT_Dependent; 1683 1684 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1685 if (!RT) 1686 return Expr::CT_Cannot; 1687 1688 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1689 return Expr::CT_Cannot; 1690 1691 if (Op->Classify(C).isPRValue()) 1692 return Expr::CT_Cannot; 1693 1694 return Expr::CT_Can; 1695} 1696 1697Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1698 // C++ [expr.unary.noexcept]p3: 1699 // [Can throw] if in a potentially-evaluated context the expression would 1700 // contain: 1701 switch (getStmtClass()) { 1702 case CXXThrowExprClass: 1703 // - a potentially evaluated throw-expression 1704 return CT_Can; 1705 1706 case CXXDynamicCastExprClass: { 1707 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1708 // where T is a reference type, that requires a run-time check 1709 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1710 if (CT == CT_Can) 1711 return CT; 1712 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1713 } 1714 1715 case CXXTypeidExprClass: 1716 // - a potentially evaluated typeid expression applied to a glvalue 1717 // expression whose type is a polymorphic class type 1718 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1719 1720 // - a potentially evaluated call to a function, member function, function 1721 // pointer, or member function pointer that does not have a non-throwing 1722 // exception-specification 1723 case CallExprClass: 1724 case CXXOperatorCallExprClass: 1725 case CXXMemberCallExprClass: { 1726 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1727 if (CT == CT_Can) 1728 return CT; 1729 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1730 } 1731 1732 case CXXConstructExprClass: 1733 case CXXTemporaryObjectExprClass: { 1734 CanThrowResult CT = CanCalleeThrow( 1735 cast<CXXConstructExpr>(this)->getConstructor()); 1736 if (CT == CT_Can) 1737 return CT; 1738 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1739 } 1740 1741 case CXXNewExprClass: { 1742 CanThrowResult CT = MergeCanThrow( 1743 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1744 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1745 /*NullThrows*/false)); 1746 if (CT == CT_Can) 1747 return CT; 1748 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1749 } 1750 1751 case CXXDeleteExprClass: { 1752 CanThrowResult CT = CanCalleeThrow( 1753 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1754 if (CT == CT_Can) 1755 return CT; 1756 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1757 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1758 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1759 Arg = Cast->getSubExpr(); 1760 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1761 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1762 CanThrowResult CT2 = CanCalleeThrow( 1763 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1764 if (CT2 == CT_Can) 1765 return CT2; 1766 CT = MergeCanThrow(CT, CT2); 1767 } 1768 } 1769 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1770 } 1771 1772 case CXXBindTemporaryExprClass: { 1773 // The bound temporary has to be destroyed again, which might throw. 1774 CanThrowResult CT = CanCalleeThrow( 1775 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1776 if (CT == CT_Can) 1777 return CT; 1778 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1779 } 1780 1781 // ObjC message sends are like function calls, but never have exception 1782 // specs. 1783 case ObjCMessageExprClass: 1784 case ObjCPropertyRefExprClass: 1785 return CT_Can; 1786 1787 // Many other things have subexpressions, so we have to test those. 1788 // Some are simple: 1789 case ParenExprClass: 1790 case MemberExprClass: 1791 case CXXReinterpretCastExprClass: 1792 case CXXConstCastExprClass: 1793 case ConditionalOperatorClass: 1794 case CompoundLiteralExprClass: 1795 case ExtVectorElementExprClass: 1796 case InitListExprClass: 1797 case DesignatedInitExprClass: 1798 case ParenListExprClass: 1799 case VAArgExprClass: 1800 case CXXDefaultArgExprClass: 1801 case ExprWithCleanupsClass: 1802 case ObjCIvarRefExprClass: 1803 case ObjCIsaExprClass: 1804 case ShuffleVectorExprClass: 1805 return CanSubExprsThrow(C, this); 1806 1807 // Some might be dependent for other reasons. 1808 case UnaryOperatorClass: 1809 case ArraySubscriptExprClass: 1810 case ImplicitCastExprClass: 1811 case CStyleCastExprClass: 1812 case CXXStaticCastExprClass: 1813 case CXXFunctionalCastExprClass: 1814 case BinaryOperatorClass: 1815 case CompoundAssignOperatorClass: { 1816 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1817 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1818 } 1819 1820 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1821 case StmtExprClass: 1822 return CT_Can; 1823 1824 case ChooseExprClass: 1825 if (isTypeDependent() || isValueDependent()) 1826 return CT_Dependent; 1827 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1828 1829 // Some expressions are always dependent. 1830 case DependentScopeDeclRefExprClass: 1831 case CXXUnresolvedConstructExprClass: 1832 case CXXDependentScopeMemberExprClass: 1833 return CT_Dependent; 1834 1835 default: 1836 // All other expressions don't have subexpressions, or else they are 1837 // unevaluated. 1838 return CT_Cannot; 1839 } 1840} 1841 1842Expr* Expr::IgnoreParens() { 1843 Expr* E = this; 1844 while (true) { 1845 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1846 E = P->getSubExpr(); 1847 continue; 1848 } 1849 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1850 if (P->getOpcode() == UO_Extension) { 1851 E = P->getSubExpr(); 1852 continue; 1853 } 1854 } 1855 return E; 1856 } 1857} 1858 1859/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1860/// or CastExprs or ImplicitCastExprs, returning their operand. 1861Expr *Expr::IgnoreParenCasts() { 1862 Expr *E = this; 1863 while (true) { 1864 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1865 E = P->getSubExpr(); 1866 continue; 1867 } 1868 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1869 E = P->getSubExpr(); 1870 continue; 1871 } 1872 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1873 if (P->getOpcode() == UO_Extension) { 1874 E = P->getSubExpr(); 1875 continue; 1876 } 1877 } 1878 return E; 1879 } 1880} 1881 1882/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1883/// casts. This is intended purely as a temporary workaround for code 1884/// that hasn't yet been rewritten to do the right thing about those 1885/// casts, and may disappear along with the last internal use. 1886Expr *Expr::IgnoreParenLValueCasts() { 1887 Expr *E = this; 1888 while (true) { 1889 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1890 E = P->getSubExpr(); 1891 continue; 1892 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1893 if (P->getCastKind() == CK_LValueToRValue) { 1894 E = P->getSubExpr(); 1895 continue; 1896 } 1897 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1898 if (P->getOpcode() == UO_Extension) { 1899 E = P->getSubExpr(); 1900 continue; 1901 } 1902 } 1903 break; 1904 } 1905 return E; 1906} 1907 1908Expr *Expr::IgnoreParenImpCasts() { 1909 Expr *E = this; 1910 while (true) { 1911 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1912 E = P->getSubExpr(); 1913 continue; 1914 } 1915 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1916 E = P->getSubExpr(); 1917 continue; 1918 } 1919 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1920 if (P->getOpcode() == UO_Extension) { 1921 E = P->getSubExpr(); 1922 continue; 1923 } 1924 } 1925 return E; 1926 } 1927} 1928 1929/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1930/// value (including ptr->int casts of the same size). Strip off any 1931/// ParenExpr or CastExprs, returning their operand. 1932Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1933 Expr *E = this; 1934 while (true) { 1935 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1936 E = P->getSubExpr(); 1937 continue; 1938 } 1939 1940 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1941 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1942 // ptr<->int casts of the same width. We also ignore all identity casts. 1943 Expr *SE = P->getSubExpr(); 1944 1945 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1946 E = SE; 1947 continue; 1948 } 1949 1950 if ((E->getType()->isPointerType() || 1951 E->getType()->isIntegralType(Ctx)) && 1952 (SE->getType()->isPointerType() || 1953 SE->getType()->isIntegralType(Ctx)) && 1954 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1955 E = SE; 1956 continue; 1957 } 1958 } 1959 1960 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1961 if (P->getOpcode() == UO_Extension) { 1962 E = P->getSubExpr(); 1963 continue; 1964 } 1965 } 1966 1967 return E; 1968 } 1969} 1970 1971bool Expr::isDefaultArgument() const { 1972 const Expr *E = this; 1973 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1974 E = ICE->getSubExprAsWritten(); 1975 1976 return isa<CXXDefaultArgExpr>(E); 1977} 1978 1979/// \brief Skip over any no-op casts and any temporary-binding 1980/// expressions. 1981static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1982 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1983 if (ICE->getCastKind() == CK_NoOp) 1984 E = ICE->getSubExpr(); 1985 else 1986 break; 1987 } 1988 1989 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1990 E = BE->getSubExpr(); 1991 1992 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1993 if (ICE->getCastKind() == CK_NoOp) 1994 E = ICE->getSubExpr(); 1995 else 1996 break; 1997 } 1998 1999 return E->IgnoreParens(); 2000} 2001 2002/// isTemporaryObject - Determines if this expression produces a 2003/// temporary of the given class type. 2004bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2005 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2006 return false; 2007 2008 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2009 2010 // Temporaries are by definition pr-values of class type. 2011 if (!E->Classify(C).isPRValue()) { 2012 // In this context, property reference is a message call and is pr-value. 2013 if (!isa<ObjCPropertyRefExpr>(E)) 2014 return false; 2015 } 2016 2017 // Black-list a few cases which yield pr-values of class type that don't 2018 // refer to temporaries of that type: 2019 2020 // - implicit derived-to-base conversions 2021 if (isa<ImplicitCastExpr>(E)) { 2022 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2023 case CK_DerivedToBase: 2024 case CK_UncheckedDerivedToBase: 2025 return false; 2026 default: 2027 break; 2028 } 2029 } 2030 2031 // - member expressions (all) 2032 if (isa<MemberExpr>(E)) 2033 return false; 2034 2035 // - opaque values (all) 2036 if (isa<OpaqueValueExpr>(E)) 2037 return false; 2038 2039 return true; 2040} 2041 2042bool Expr::isImplicitCXXThis() const { 2043 const Expr *E = this; 2044 2045 // Strip away parentheses and casts we don't care about. 2046 while (true) { 2047 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2048 E = Paren->getSubExpr(); 2049 continue; 2050 } 2051 2052 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2053 if (ICE->getCastKind() == CK_NoOp || 2054 ICE->getCastKind() == CK_LValueToRValue || 2055 ICE->getCastKind() == CK_DerivedToBase || 2056 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2057 E = ICE->getSubExpr(); 2058 continue; 2059 } 2060 } 2061 2062 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2063 if (UnOp->getOpcode() == UO_Extension) { 2064 E = UnOp->getSubExpr(); 2065 continue; 2066 } 2067 } 2068 2069 break; 2070 } 2071 2072 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2073 return This->isImplicit(); 2074 2075 return false; 2076} 2077 2078/// hasAnyTypeDependentArguments - Determines if any of the expressions 2079/// in Exprs is type-dependent. 2080bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 2081 for (unsigned I = 0; I < NumExprs; ++I) 2082 if (Exprs[I]->isTypeDependent()) 2083 return true; 2084 2085 return false; 2086} 2087 2088/// hasAnyValueDependentArguments - Determines if any of the expressions 2089/// in Exprs is value-dependent. 2090bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 2091 for (unsigned I = 0; I < NumExprs; ++I) 2092 if (Exprs[I]->isValueDependent()) 2093 return true; 2094 2095 return false; 2096} 2097 2098bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2099 // This function is attempting whether an expression is an initializer 2100 // which can be evaluated at compile-time. isEvaluatable handles most 2101 // of the cases, but it can't deal with some initializer-specific 2102 // expressions, and it can't deal with aggregates; we deal with those here, 2103 // and fall back to isEvaluatable for the other cases. 2104 2105 // If we ever capture reference-binding directly in the AST, we can 2106 // kill the second parameter. 2107 2108 if (IsForRef) { 2109 EvalResult Result; 2110 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2111 } 2112 2113 switch (getStmtClass()) { 2114 default: break; 2115 case StringLiteralClass: 2116 case ObjCStringLiteralClass: 2117 case ObjCEncodeExprClass: 2118 return true; 2119 case CXXTemporaryObjectExprClass: 2120 case CXXConstructExprClass: { 2121 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2122 2123 // Only if it's 2124 // 1) an application of the trivial default constructor or 2125 if (!CE->getConstructor()->isTrivial()) return false; 2126 if (!CE->getNumArgs()) return true; 2127 2128 // 2) an elidable trivial copy construction of an operand which is 2129 // itself a constant initializer. Note that we consider the 2130 // operand on its own, *not* as a reference binding. 2131 return CE->isElidable() && 2132 CE->getArg(0)->isConstantInitializer(Ctx, false); 2133 } 2134 case CompoundLiteralExprClass: { 2135 // This handles gcc's extension that allows global initializers like 2136 // "struct x {int x;} x = (struct x) {};". 2137 // FIXME: This accepts other cases it shouldn't! 2138 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2139 return Exp->isConstantInitializer(Ctx, false); 2140 } 2141 case InitListExprClass: { 2142 // FIXME: This doesn't deal with fields with reference types correctly. 2143 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2144 // to bitfields. 2145 const InitListExpr *Exp = cast<InitListExpr>(this); 2146 unsigned numInits = Exp->getNumInits(); 2147 for (unsigned i = 0; i < numInits; i++) { 2148 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2149 return false; 2150 } 2151 return true; 2152 } 2153 case ImplicitValueInitExprClass: 2154 return true; 2155 case ParenExprClass: 2156 return cast<ParenExpr>(this)->getSubExpr() 2157 ->isConstantInitializer(Ctx, IsForRef); 2158 case ChooseExprClass: 2159 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2160 ->isConstantInitializer(Ctx, IsForRef); 2161 case UnaryOperatorClass: { 2162 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2163 if (Exp->getOpcode() == UO_Extension) 2164 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2165 break; 2166 } 2167 case BinaryOperatorClass: { 2168 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2169 // but this handles the common case. 2170 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2171 if (Exp->getOpcode() == BO_Sub && 2172 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2173 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2174 return true; 2175 break; 2176 } 2177 case CXXFunctionalCastExprClass: 2178 case CXXStaticCastExprClass: 2179 case ImplicitCastExprClass: 2180 case CStyleCastExprClass: 2181 // Handle casts with a destination that's a struct or union; this 2182 // deals with both the gcc no-op struct cast extension and the 2183 // cast-to-union extension. 2184 if (getType()->isRecordType()) 2185 return cast<CastExpr>(this)->getSubExpr() 2186 ->isConstantInitializer(Ctx, false); 2187 2188 // Integer->integer casts can be handled here, which is important for 2189 // things like (int)(&&x-&&y). Scary but true. 2190 if (getType()->isIntegerType() && 2191 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2192 return cast<CastExpr>(this)->getSubExpr() 2193 ->isConstantInitializer(Ctx, false); 2194 2195 break; 2196 } 2197 return isEvaluatable(Ctx); 2198} 2199 2200/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2201/// pointer constant or not, as well as the specific kind of constant detected. 2202/// Null pointer constants can be integer constant expressions with the 2203/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2204/// (a GNU extension). 2205Expr::NullPointerConstantKind 2206Expr::isNullPointerConstant(ASTContext &Ctx, 2207 NullPointerConstantValueDependence NPC) const { 2208 if (isValueDependent()) { 2209 switch (NPC) { 2210 case NPC_NeverValueDependent: 2211 assert(false && "Unexpected value dependent expression!"); 2212 // If the unthinkable happens, fall through to the safest alternative. 2213 2214 case NPC_ValueDependentIsNull: 2215 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2216 return NPCK_ZeroInteger; 2217 else 2218 return NPCK_NotNull; 2219 2220 case NPC_ValueDependentIsNotNull: 2221 return NPCK_NotNull; 2222 } 2223 } 2224 2225 // Strip off a cast to void*, if it exists. Except in C++. 2226 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2227 if (!Ctx.getLangOptions().CPlusPlus) { 2228 // Check that it is a cast to void*. 2229 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2230 QualType Pointee = PT->getPointeeType(); 2231 if (!Pointee.hasQualifiers() && 2232 Pointee->isVoidType() && // to void* 2233 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2234 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2235 } 2236 } 2237 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2238 // Ignore the ImplicitCastExpr type entirely. 2239 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2240 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2241 // Accept ((void*)0) as a null pointer constant, as many other 2242 // implementations do. 2243 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2244 } else if (const CXXDefaultArgExpr *DefaultArg 2245 = dyn_cast<CXXDefaultArgExpr>(this)) { 2246 // See through default argument expressions 2247 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2248 } else if (isa<GNUNullExpr>(this)) { 2249 // The GNU __null extension is always a null pointer constant. 2250 return NPCK_GNUNull; 2251 } 2252 2253 // C++0x nullptr_t is always a null pointer constant. 2254 if (getType()->isNullPtrType()) 2255 return NPCK_CXX0X_nullptr; 2256 2257 if (const RecordType *UT = getType()->getAsUnionType()) 2258 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2259 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2260 const Expr *InitExpr = CLE->getInitializer(); 2261 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2262 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2263 } 2264 // This expression must be an integer type. 2265 if (!getType()->isIntegerType() || 2266 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2267 return NPCK_NotNull; 2268 2269 // If we have an integer constant expression, we need to *evaluate* it and 2270 // test for the value 0. 2271 llvm::APSInt Result; 2272 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0; 2273 2274 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull); 2275} 2276 2277/// \brief If this expression is an l-value for an Objective C 2278/// property, find the underlying property reference expression. 2279const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2280 const Expr *E = this; 2281 while (true) { 2282 assert((E->getValueKind() == VK_LValue && 2283 E->getObjectKind() == OK_ObjCProperty) && 2284 "expression is not a property reference"); 2285 E = E->IgnoreParenCasts(); 2286 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2287 if (BO->getOpcode() == BO_Comma) { 2288 E = BO->getRHS(); 2289 continue; 2290 } 2291 } 2292 2293 break; 2294 } 2295 2296 return cast<ObjCPropertyRefExpr>(E); 2297} 2298 2299FieldDecl *Expr::getBitField() { 2300 Expr *E = this->IgnoreParens(); 2301 2302 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2303 if (ICE->getCastKind() == CK_LValueToRValue || 2304 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2305 E = ICE->getSubExpr()->IgnoreParens(); 2306 else 2307 break; 2308 } 2309 2310 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2311 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2312 if (Field->isBitField()) 2313 return Field; 2314 2315 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2316 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2317 if (Field->isBitField()) 2318 return Field; 2319 2320 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2321 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2322 return BinOp->getLHS()->getBitField(); 2323 2324 return 0; 2325} 2326 2327bool Expr::refersToVectorElement() const { 2328 const Expr *E = this->IgnoreParens(); 2329 2330 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2331 if (ICE->getValueKind() != VK_RValue && 2332 ICE->getCastKind() == CK_NoOp) 2333 E = ICE->getSubExpr()->IgnoreParens(); 2334 else 2335 break; 2336 } 2337 2338 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2339 return ASE->getBase()->getType()->isVectorType(); 2340 2341 if (isa<ExtVectorElementExpr>(E)) 2342 return true; 2343 2344 return false; 2345} 2346 2347/// isArrow - Return true if the base expression is a pointer to vector, 2348/// return false if the base expression is a vector. 2349bool ExtVectorElementExpr::isArrow() const { 2350 return getBase()->getType()->isPointerType(); 2351} 2352 2353unsigned ExtVectorElementExpr::getNumElements() const { 2354 if (const VectorType *VT = getType()->getAs<VectorType>()) 2355 return VT->getNumElements(); 2356 return 1; 2357} 2358 2359/// containsDuplicateElements - Return true if any element access is repeated. 2360bool ExtVectorElementExpr::containsDuplicateElements() const { 2361 // FIXME: Refactor this code to an accessor on the AST node which returns the 2362 // "type" of component access, and share with code below and in Sema. 2363 llvm::StringRef Comp = Accessor->getName(); 2364 2365 // Halving swizzles do not contain duplicate elements. 2366 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2367 return false; 2368 2369 // Advance past s-char prefix on hex swizzles. 2370 if (Comp[0] == 's' || Comp[0] == 'S') 2371 Comp = Comp.substr(1); 2372 2373 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2374 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2375 return true; 2376 2377 return false; 2378} 2379 2380/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2381void ExtVectorElementExpr::getEncodedElementAccess( 2382 llvm::SmallVectorImpl<unsigned> &Elts) const { 2383 llvm::StringRef Comp = Accessor->getName(); 2384 if (Comp[0] == 's' || Comp[0] == 'S') 2385 Comp = Comp.substr(1); 2386 2387 bool isHi = Comp == "hi"; 2388 bool isLo = Comp == "lo"; 2389 bool isEven = Comp == "even"; 2390 bool isOdd = Comp == "odd"; 2391 2392 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2393 uint64_t Index; 2394 2395 if (isHi) 2396 Index = e + i; 2397 else if (isLo) 2398 Index = i; 2399 else if (isEven) 2400 Index = 2 * i; 2401 else if (isOdd) 2402 Index = 2 * i + 1; 2403 else 2404 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2405 2406 Elts.push_back(Index); 2407 } 2408} 2409 2410ObjCMessageExpr::ObjCMessageExpr(QualType T, 2411 ExprValueKind VK, 2412 SourceLocation LBracLoc, 2413 SourceLocation SuperLoc, 2414 bool IsInstanceSuper, 2415 QualType SuperType, 2416 Selector Sel, 2417 SourceLocation SelLoc, 2418 ObjCMethodDecl *Method, 2419 Expr **Args, unsigned NumArgs, 2420 SourceLocation RBracLoc) 2421 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2422 /*TypeDependent=*/false, /*ValueDependent=*/false, 2423 /*ContainsUnexpandedParameterPack=*/false), 2424 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2425 HasMethod(Method != 0), SuperLoc(SuperLoc), 2426 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2427 : Sel.getAsOpaquePtr())), 2428 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2429{ 2430 setReceiverPointer(SuperType.getAsOpaquePtr()); 2431 if (NumArgs) 2432 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2433} 2434 2435ObjCMessageExpr::ObjCMessageExpr(QualType T, 2436 ExprValueKind VK, 2437 SourceLocation LBracLoc, 2438 TypeSourceInfo *Receiver, 2439 Selector Sel, 2440 SourceLocation SelLoc, 2441 ObjCMethodDecl *Method, 2442 Expr **Args, unsigned NumArgs, 2443 SourceLocation RBracLoc) 2444 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2445 T->isDependentType(), T->containsUnexpandedParameterPack()), 2446 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2447 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2448 : Sel.getAsOpaquePtr())), 2449 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2450{ 2451 setReceiverPointer(Receiver); 2452 Expr **MyArgs = getArgs(); 2453 for (unsigned I = 0; I != NumArgs; ++I) { 2454 if (Args[I]->isTypeDependent()) 2455 ExprBits.TypeDependent = true; 2456 if (Args[I]->isValueDependent()) 2457 ExprBits.ValueDependent = true; 2458 if (Args[I]->containsUnexpandedParameterPack()) 2459 ExprBits.ContainsUnexpandedParameterPack = true; 2460 2461 MyArgs[I] = Args[I]; 2462 } 2463} 2464 2465ObjCMessageExpr::ObjCMessageExpr(QualType T, 2466 ExprValueKind VK, 2467 SourceLocation LBracLoc, 2468 Expr *Receiver, 2469 Selector Sel, 2470 SourceLocation SelLoc, 2471 ObjCMethodDecl *Method, 2472 Expr **Args, unsigned NumArgs, 2473 SourceLocation RBracLoc) 2474 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2475 Receiver->isTypeDependent(), 2476 Receiver->containsUnexpandedParameterPack()), 2477 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2478 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2479 : Sel.getAsOpaquePtr())), 2480 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2481{ 2482 setReceiverPointer(Receiver); 2483 Expr **MyArgs = getArgs(); 2484 for (unsigned I = 0; I != NumArgs; ++I) { 2485 if (Args[I]->isTypeDependent()) 2486 ExprBits.TypeDependent = true; 2487 if (Args[I]->isValueDependent()) 2488 ExprBits.ValueDependent = true; 2489 if (Args[I]->containsUnexpandedParameterPack()) 2490 ExprBits.ContainsUnexpandedParameterPack = true; 2491 2492 MyArgs[I] = Args[I]; 2493 } 2494} 2495 2496ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2497 ExprValueKind VK, 2498 SourceLocation LBracLoc, 2499 SourceLocation SuperLoc, 2500 bool IsInstanceSuper, 2501 QualType SuperType, 2502 Selector Sel, 2503 SourceLocation SelLoc, 2504 ObjCMethodDecl *Method, 2505 Expr **Args, unsigned NumArgs, 2506 SourceLocation RBracLoc) { 2507 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2508 NumArgs * sizeof(Expr *); 2509 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2510 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2511 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2512 RBracLoc); 2513} 2514 2515ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2516 ExprValueKind VK, 2517 SourceLocation LBracLoc, 2518 TypeSourceInfo *Receiver, 2519 Selector Sel, 2520 SourceLocation SelLoc, 2521 ObjCMethodDecl *Method, 2522 Expr **Args, unsigned NumArgs, 2523 SourceLocation RBracLoc) { 2524 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2525 NumArgs * sizeof(Expr *); 2526 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2527 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2528 Method, Args, NumArgs, RBracLoc); 2529} 2530 2531ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2532 ExprValueKind VK, 2533 SourceLocation LBracLoc, 2534 Expr *Receiver, 2535 Selector Sel, 2536 SourceLocation SelLoc, 2537 ObjCMethodDecl *Method, 2538 Expr **Args, unsigned NumArgs, 2539 SourceLocation RBracLoc) { 2540 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2541 NumArgs * sizeof(Expr *); 2542 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2543 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2544 Method, Args, NumArgs, RBracLoc); 2545} 2546 2547ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2548 unsigned NumArgs) { 2549 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2550 NumArgs * sizeof(Expr *); 2551 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2552 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2553} 2554 2555SourceRange ObjCMessageExpr::getReceiverRange() const { 2556 switch (getReceiverKind()) { 2557 case Instance: 2558 return getInstanceReceiver()->getSourceRange(); 2559 2560 case Class: 2561 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2562 2563 case SuperInstance: 2564 case SuperClass: 2565 return getSuperLoc(); 2566 } 2567 2568 return SourceLocation(); 2569} 2570 2571Selector ObjCMessageExpr::getSelector() const { 2572 if (HasMethod) 2573 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2574 ->getSelector(); 2575 return Selector(SelectorOrMethod); 2576} 2577 2578ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2579 switch (getReceiverKind()) { 2580 case Instance: 2581 if (const ObjCObjectPointerType *Ptr 2582 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2583 return Ptr->getInterfaceDecl(); 2584 break; 2585 2586 case Class: 2587 if (const ObjCObjectType *Ty 2588 = getClassReceiver()->getAs<ObjCObjectType>()) 2589 return Ty->getInterface(); 2590 break; 2591 2592 case SuperInstance: 2593 if (const ObjCObjectPointerType *Ptr 2594 = getSuperType()->getAs<ObjCObjectPointerType>()) 2595 return Ptr->getInterfaceDecl(); 2596 break; 2597 2598 case SuperClass: 2599 if (const ObjCObjectType *Iface 2600 = getSuperType()->getAs<ObjCObjectType>()) 2601 return Iface->getInterface(); 2602 break; 2603 } 2604 2605 return 0; 2606} 2607 2608bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2609 return getCond()->EvaluateAsInt(C) != 0; 2610} 2611 2612ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2613 QualType Type, SourceLocation BLoc, 2614 SourceLocation RP) 2615 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2616 Type->isDependentType(), Type->isDependentType(), 2617 Type->containsUnexpandedParameterPack()), 2618 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2619{ 2620 SubExprs = new (C) Stmt*[nexpr]; 2621 for (unsigned i = 0; i < nexpr; i++) { 2622 if (args[i]->isTypeDependent()) 2623 ExprBits.TypeDependent = true; 2624 if (args[i]->isValueDependent()) 2625 ExprBits.ValueDependent = true; 2626 if (args[i]->containsUnexpandedParameterPack()) 2627 ExprBits.ContainsUnexpandedParameterPack = true; 2628 2629 SubExprs[i] = args[i]; 2630 } 2631} 2632 2633void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2634 unsigned NumExprs) { 2635 if (SubExprs) C.Deallocate(SubExprs); 2636 2637 SubExprs = new (C) Stmt* [NumExprs]; 2638 this->NumExprs = NumExprs; 2639 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2640} 2641 2642//===----------------------------------------------------------------------===// 2643// DesignatedInitExpr 2644//===----------------------------------------------------------------------===// 2645 2646IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2647 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2648 if (Field.NameOrField & 0x01) 2649 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2650 else 2651 return getField()->getIdentifier(); 2652} 2653 2654DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2655 unsigned NumDesignators, 2656 const Designator *Designators, 2657 SourceLocation EqualOrColonLoc, 2658 bool GNUSyntax, 2659 Expr **IndexExprs, 2660 unsigned NumIndexExprs, 2661 Expr *Init) 2662 : Expr(DesignatedInitExprClass, Ty, 2663 Init->getValueKind(), Init->getObjectKind(), 2664 Init->isTypeDependent(), Init->isValueDependent(), 2665 Init->containsUnexpandedParameterPack()), 2666 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2667 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2668 this->Designators = new (C) Designator[NumDesignators]; 2669 2670 // Record the initializer itself. 2671 child_range Child = children(); 2672 *Child++ = Init; 2673 2674 // Copy the designators and their subexpressions, computing 2675 // value-dependence along the way. 2676 unsigned IndexIdx = 0; 2677 for (unsigned I = 0; I != NumDesignators; ++I) { 2678 this->Designators[I] = Designators[I]; 2679 2680 if (this->Designators[I].isArrayDesignator()) { 2681 // Compute type- and value-dependence. 2682 Expr *Index = IndexExprs[IndexIdx]; 2683 if (Index->isTypeDependent() || Index->isValueDependent()) 2684 ExprBits.ValueDependent = true; 2685 2686 // Propagate unexpanded parameter packs. 2687 if (Index->containsUnexpandedParameterPack()) 2688 ExprBits.ContainsUnexpandedParameterPack = true; 2689 2690 // Copy the index expressions into permanent storage. 2691 *Child++ = IndexExprs[IndexIdx++]; 2692 } else if (this->Designators[I].isArrayRangeDesignator()) { 2693 // Compute type- and value-dependence. 2694 Expr *Start = IndexExprs[IndexIdx]; 2695 Expr *End = IndexExprs[IndexIdx + 1]; 2696 if (Start->isTypeDependent() || Start->isValueDependent() || 2697 End->isTypeDependent() || End->isValueDependent()) 2698 ExprBits.ValueDependent = true; 2699 2700 // Propagate unexpanded parameter packs. 2701 if (Start->containsUnexpandedParameterPack() || 2702 End->containsUnexpandedParameterPack()) 2703 ExprBits.ContainsUnexpandedParameterPack = true; 2704 2705 // Copy the start/end expressions into permanent storage. 2706 *Child++ = IndexExprs[IndexIdx++]; 2707 *Child++ = IndexExprs[IndexIdx++]; 2708 } 2709 } 2710 2711 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2712} 2713 2714DesignatedInitExpr * 2715DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2716 unsigned NumDesignators, 2717 Expr **IndexExprs, unsigned NumIndexExprs, 2718 SourceLocation ColonOrEqualLoc, 2719 bool UsesColonSyntax, Expr *Init) { 2720 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2721 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2722 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2723 ColonOrEqualLoc, UsesColonSyntax, 2724 IndexExprs, NumIndexExprs, Init); 2725} 2726 2727DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2728 unsigned NumIndexExprs) { 2729 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2730 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2731 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2732} 2733 2734void DesignatedInitExpr::setDesignators(ASTContext &C, 2735 const Designator *Desigs, 2736 unsigned NumDesigs) { 2737 Designators = new (C) Designator[NumDesigs]; 2738 NumDesignators = NumDesigs; 2739 for (unsigned I = 0; I != NumDesigs; ++I) 2740 Designators[I] = Desigs[I]; 2741} 2742 2743SourceRange DesignatedInitExpr::getSourceRange() const { 2744 SourceLocation StartLoc; 2745 Designator &First = 2746 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2747 if (First.isFieldDesignator()) { 2748 if (GNUSyntax) 2749 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2750 else 2751 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2752 } else 2753 StartLoc = 2754 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2755 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2756} 2757 2758Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2759 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2760 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2761 Ptr += sizeof(DesignatedInitExpr); 2762 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2763 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2764} 2765 2766Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2767 assert(D.Kind == Designator::ArrayRangeDesignator && 2768 "Requires array range designator"); 2769 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2770 Ptr += sizeof(DesignatedInitExpr); 2771 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2772 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2773} 2774 2775Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2776 assert(D.Kind == Designator::ArrayRangeDesignator && 2777 "Requires array range designator"); 2778 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2779 Ptr += sizeof(DesignatedInitExpr); 2780 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2781 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2782} 2783 2784/// \brief Replaces the designator at index @p Idx with the series 2785/// of designators in [First, Last). 2786void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2787 const Designator *First, 2788 const Designator *Last) { 2789 unsigned NumNewDesignators = Last - First; 2790 if (NumNewDesignators == 0) { 2791 std::copy_backward(Designators + Idx + 1, 2792 Designators + NumDesignators, 2793 Designators + Idx); 2794 --NumNewDesignators; 2795 return; 2796 } else if (NumNewDesignators == 1) { 2797 Designators[Idx] = *First; 2798 return; 2799 } 2800 2801 Designator *NewDesignators 2802 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2803 std::copy(Designators, Designators + Idx, NewDesignators); 2804 std::copy(First, Last, NewDesignators + Idx); 2805 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2806 NewDesignators + Idx + NumNewDesignators); 2807 Designators = NewDesignators; 2808 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2809} 2810 2811ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2812 Expr **exprs, unsigned nexprs, 2813 SourceLocation rparenloc) 2814 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2815 false, false, false), 2816 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2817 2818 Exprs = new (C) Stmt*[nexprs]; 2819 for (unsigned i = 0; i != nexprs; ++i) { 2820 if (exprs[i]->isTypeDependent()) 2821 ExprBits.TypeDependent = true; 2822 if (exprs[i]->isValueDependent()) 2823 ExprBits.ValueDependent = true; 2824 if (exprs[i]->containsUnexpandedParameterPack()) 2825 ExprBits.ContainsUnexpandedParameterPack = true; 2826 2827 Exprs[i] = exprs[i]; 2828 } 2829} 2830 2831const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 2832 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 2833 e = ewc->getSubExpr(); 2834 e = cast<CXXConstructExpr>(e)->getArg(0); 2835 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2836 e = ice->getSubExpr(); 2837 return cast<OpaqueValueExpr>(e); 2838} 2839 2840//===----------------------------------------------------------------------===// 2841// ExprIterator. 2842//===----------------------------------------------------------------------===// 2843 2844Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2845Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2846Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2847const Expr* ConstExprIterator::operator[](size_t idx) const { 2848 return cast<Expr>(I[idx]); 2849} 2850const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2851const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2852 2853//===----------------------------------------------------------------------===// 2854// Child Iterators for iterating over subexpressions/substatements 2855//===----------------------------------------------------------------------===// 2856 2857// UnaryExprOrTypeTraitExpr 2858Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 2859 // If this is of a type and the type is a VLA type (and not a typedef), the 2860 // size expression of the VLA needs to be treated as an executable expression. 2861 // Why isn't this weirdness documented better in StmtIterator? 2862 if (isArgumentType()) { 2863 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 2864 getArgumentType().getTypePtr())) 2865 return child_range(child_iterator(T), child_iterator()); 2866 return child_range(); 2867 } 2868 return child_range(&Argument.Ex, &Argument.Ex + 1); 2869} 2870 2871// ObjCMessageExpr 2872Stmt::child_range ObjCMessageExpr::children() { 2873 Stmt **begin; 2874 if (getReceiverKind() == Instance) 2875 begin = reinterpret_cast<Stmt **>(this + 1); 2876 else 2877 begin = reinterpret_cast<Stmt **>(getArgs()); 2878 return child_range(begin, 2879 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 2880} 2881 2882// Blocks 2883BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 2884 SourceLocation l, bool ByRef, 2885 bool constAdded) 2886 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, 2887 d->isParameterPack()), 2888 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 2889{ 2890 bool TypeDependent = false; 2891 bool ValueDependent = false; 2892 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent); 2893 ExprBits.TypeDependent = TypeDependent; 2894 ExprBits.ValueDependent = ValueDependent; 2895} 2896 2897