Expr.cpp revision 218893
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(NestedNameSpecifier *Qualifier, 280 SourceRange QualifierRange, 281 ValueDecl *D, SourceLocation NameLoc, 282 const TemplateArgumentListInfo *TemplateArgs, 283 QualType T, ExprValueKind VK) 284 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 285 DecoratedD(D, 286 (Qualifier? HasQualifierFlag : 0) | 287 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 288 Loc(NameLoc) { 289 if (Qualifier) { 290 NameQualifier *NQ = getNameQualifier(); 291 NQ->NNS = Qualifier; 292 NQ->Range = QualifierRange; 293 } 294 295 if (TemplateArgs) 296 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 297 298 computeDependence(); 299} 300 301DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 302 SourceRange QualifierRange, 303 ValueDecl *D, const DeclarationNameInfo &NameInfo, 304 const TemplateArgumentListInfo *TemplateArgs, 305 QualType T, ExprValueKind VK) 306 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 307 DecoratedD(D, 308 (Qualifier? HasQualifierFlag : 0) | 309 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 310 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 311 if (Qualifier) { 312 NameQualifier *NQ = getNameQualifier(); 313 NQ->NNS = Qualifier; 314 NQ->Range = QualifierRange; 315 } 316 317 if (TemplateArgs) 318 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 319 320 computeDependence(); 321} 322 323DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 324 NestedNameSpecifier *Qualifier, 325 SourceRange QualifierRange, 326 ValueDecl *D, 327 SourceLocation NameLoc, 328 QualType T, 329 ExprValueKind VK, 330 const TemplateArgumentListInfo *TemplateArgs) { 331 return Create(Context, Qualifier, QualifierRange, D, 332 DeclarationNameInfo(D->getDeclName(), NameLoc), 333 T, VK, TemplateArgs); 334} 335 336DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 337 NestedNameSpecifier *Qualifier, 338 SourceRange QualifierRange, 339 ValueDecl *D, 340 const DeclarationNameInfo &NameInfo, 341 QualType T, 342 ExprValueKind VK, 343 const TemplateArgumentListInfo *TemplateArgs) { 344 std::size_t Size = sizeof(DeclRefExpr); 345 if (Qualifier != 0) 346 Size += sizeof(NameQualifier); 347 348 if (TemplateArgs) 349 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 350 351 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 352 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 353 TemplateArgs, T, VK); 354} 355 356DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 357 bool HasQualifier, 358 bool HasExplicitTemplateArgs, 359 unsigned NumTemplateArgs) { 360 std::size_t Size = sizeof(DeclRefExpr); 361 if (HasQualifier) 362 Size += sizeof(NameQualifier); 363 364 if (HasExplicitTemplateArgs) 365 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 366 367 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 368 return new (Mem) DeclRefExpr(EmptyShell()); 369} 370 371SourceRange DeclRefExpr::getSourceRange() const { 372 SourceRange R = getNameInfo().getSourceRange(); 373 if (hasQualifier()) 374 R.setBegin(getQualifierRange().getBegin()); 375 if (hasExplicitTemplateArgs()) 376 R.setEnd(getRAngleLoc()); 377 return R; 378} 379 380// FIXME: Maybe this should use DeclPrinter with a special "print predefined 381// expr" policy instead. 382std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 383 ASTContext &Context = CurrentDecl->getASTContext(); 384 385 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 386 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 387 return FD->getNameAsString(); 388 389 llvm::SmallString<256> Name; 390 llvm::raw_svector_ostream Out(Name); 391 392 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 393 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 394 Out << "virtual "; 395 if (MD->isStatic()) 396 Out << "static "; 397 } 398 399 PrintingPolicy Policy(Context.getLangOptions()); 400 401 std::string Proto = FD->getQualifiedNameAsString(Policy); 402 403 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 404 const FunctionProtoType *FT = 0; 405 if (FD->hasWrittenPrototype()) 406 FT = dyn_cast<FunctionProtoType>(AFT); 407 408 Proto += "("; 409 if (FT) { 410 llvm::raw_string_ostream POut(Proto); 411 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 412 if (i) POut << ", "; 413 std::string Param; 414 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 415 POut << Param; 416 } 417 418 if (FT->isVariadic()) { 419 if (FD->getNumParams()) POut << ", "; 420 POut << "..."; 421 } 422 } 423 Proto += ")"; 424 425 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 426 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 427 if (ThisQuals.hasConst()) 428 Proto += " const"; 429 if (ThisQuals.hasVolatile()) 430 Proto += " volatile"; 431 } 432 433 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 434 AFT->getResultType().getAsStringInternal(Proto, Policy); 435 436 Out << Proto; 437 438 Out.flush(); 439 return Name.str().str(); 440 } 441 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 442 llvm::SmallString<256> Name; 443 llvm::raw_svector_ostream Out(Name); 444 Out << (MD->isInstanceMethod() ? '-' : '+'); 445 Out << '['; 446 447 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 448 // a null check to avoid a crash. 449 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 450 Out << ID; 451 452 if (const ObjCCategoryImplDecl *CID = 453 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 454 Out << '(' << CID << ')'; 455 456 Out << ' '; 457 Out << MD->getSelector().getAsString(); 458 Out << ']'; 459 460 Out.flush(); 461 return Name.str().str(); 462 } 463 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 464 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 465 return "top level"; 466 } 467 return ""; 468} 469 470void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 471 if (hasAllocation()) 472 C.Deallocate(pVal); 473 474 BitWidth = Val.getBitWidth(); 475 unsigned NumWords = Val.getNumWords(); 476 const uint64_t* Words = Val.getRawData(); 477 if (NumWords > 1) { 478 pVal = new (C) uint64_t[NumWords]; 479 std::copy(Words, Words + NumWords, pVal); 480 } else if (NumWords == 1) 481 VAL = Words[0]; 482 else 483 VAL = 0; 484} 485 486IntegerLiteral * 487IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 488 QualType type, SourceLocation l) { 489 return new (C) IntegerLiteral(C, V, type, l); 490} 491 492IntegerLiteral * 493IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 494 return new (C) IntegerLiteral(Empty); 495} 496 497FloatingLiteral * 498FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 499 bool isexact, QualType Type, SourceLocation L) { 500 return new (C) FloatingLiteral(C, V, isexact, Type, L); 501} 502 503FloatingLiteral * 504FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 505 return new (C) FloatingLiteral(Empty); 506} 507 508/// getValueAsApproximateDouble - This returns the value as an inaccurate 509/// double. Note that this may cause loss of precision, but is useful for 510/// debugging dumps, etc. 511double FloatingLiteral::getValueAsApproximateDouble() const { 512 llvm::APFloat V = getValue(); 513 bool ignored; 514 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 515 &ignored); 516 return V.convertToDouble(); 517} 518 519StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 520 unsigned ByteLength, bool Wide, 521 QualType Ty, 522 const SourceLocation *Loc, 523 unsigned NumStrs) { 524 // Allocate enough space for the StringLiteral plus an array of locations for 525 // any concatenated string tokens. 526 void *Mem = C.Allocate(sizeof(StringLiteral)+ 527 sizeof(SourceLocation)*(NumStrs-1), 528 llvm::alignOf<StringLiteral>()); 529 StringLiteral *SL = new (Mem) StringLiteral(Ty); 530 531 // OPTIMIZE: could allocate this appended to the StringLiteral. 532 char *AStrData = new (C, 1) char[ByteLength]; 533 memcpy(AStrData, StrData, ByteLength); 534 SL->StrData = AStrData; 535 SL->ByteLength = ByteLength; 536 SL->IsWide = Wide; 537 SL->TokLocs[0] = Loc[0]; 538 SL->NumConcatenated = NumStrs; 539 540 if (NumStrs != 1) 541 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 542 return SL; 543} 544 545StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 546 void *Mem = C.Allocate(sizeof(StringLiteral)+ 547 sizeof(SourceLocation)*(NumStrs-1), 548 llvm::alignOf<StringLiteral>()); 549 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 550 SL->StrData = 0; 551 SL->ByteLength = 0; 552 SL->NumConcatenated = NumStrs; 553 return SL; 554} 555 556void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 557 char *AStrData = new (C, 1) char[Str.size()]; 558 memcpy(AStrData, Str.data(), Str.size()); 559 StrData = AStrData; 560 ByteLength = Str.size(); 561} 562 563/// getLocationOfByte - Return a source location that points to the specified 564/// byte of this string literal. 565/// 566/// Strings are amazingly complex. They can be formed from multiple tokens and 567/// can have escape sequences in them in addition to the usual trigraph and 568/// escaped newline business. This routine handles this complexity. 569/// 570SourceLocation StringLiteral:: 571getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 572 const LangOptions &Features, const TargetInfo &Target) const { 573 assert(!isWide() && "This doesn't work for wide strings yet"); 574 575 // Loop over all of the tokens in this string until we find the one that 576 // contains the byte we're looking for. 577 unsigned TokNo = 0; 578 while (1) { 579 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 580 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 581 582 // Get the spelling of the string so that we can get the data that makes up 583 // the string literal, not the identifier for the macro it is potentially 584 // expanded through. 585 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 586 587 // Re-lex the token to get its length and original spelling. 588 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 589 bool Invalid = false; 590 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 591 if (Invalid) 592 return StrTokSpellingLoc; 593 594 const char *StrData = Buffer.data()+LocInfo.second; 595 596 // Create a langops struct and enable trigraphs. This is sufficient for 597 // relexing tokens. 598 LangOptions LangOpts; 599 LangOpts.Trigraphs = true; 600 601 // Create a lexer starting at the beginning of this token. 602 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 603 Buffer.end()); 604 Token TheTok; 605 TheLexer.LexFromRawLexer(TheTok); 606 607 // Use the StringLiteralParser to compute the length of the string in bytes. 608 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 609 unsigned TokNumBytes = SLP.GetStringLength(); 610 611 // If the byte is in this token, return the location of the byte. 612 if (ByteNo < TokNumBytes || 613 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 614 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 615 616 // Now that we know the offset of the token in the spelling, use the 617 // preprocessor to get the offset in the original source. 618 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 619 } 620 621 // Move to the next string token. 622 ++TokNo; 623 ByteNo -= TokNumBytes; 624 } 625} 626 627 628 629/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 630/// corresponds to, e.g. "sizeof" or "[pre]++". 631const char *UnaryOperator::getOpcodeStr(Opcode Op) { 632 switch (Op) { 633 default: assert(0 && "Unknown unary operator"); 634 case UO_PostInc: return "++"; 635 case UO_PostDec: return "--"; 636 case UO_PreInc: return "++"; 637 case UO_PreDec: return "--"; 638 case UO_AddrOf: return "&"; 639 case UO_Deref: return "*"; 640 case UO_Plus: return "+"; 641 case UO_Minus: return "-"; 642 case UO_Not: return "~"; 643 case UO_LNot: return "!"; 644 case UO_Real: return "__real"; 645 case UO_Imag: return "__imag"; 646 case UO_Extension: return "__extension__"; 647 } 648} 649 650UnaryOperatorKind 651UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 652 switch (OO) { 653 default: assert(false && "No unary operator for overloaded function"); 654 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 655 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 656 case OO_Amp: return UO_AddrOf; 657 case OO_Star: return UO_Deref; 658 case OO_Plus: return UO_Plus; 659 case OO_Minus: return UO_Minus; 660 case OO_Tilde: return UO_Not; 661 case OO_Exclaim: return UO_LNot; 662 } 663} 664 665OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 666 switch (Opc) { 667 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 668 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 669 case UO_AddrOf: return OO_Amp; 670 case UO_Deref: return OO_Star; 671 case UO_Plus: return OO_Plus; 672 case UO_Minus: return OO_Minus; 673 case UO_Not: return OO_Tilde; 674 case UO_LNot: return OO_Exclaim; 675 default: return OO_None; 676 } 677} 678 679 680//===----------------------------------------------------------------------===// 681// Postfix Operators. 682//===----------------------------------------------------------------------===// 683 684CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 685 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 686 SourceLocation rparenloc) 687 : Expr(SC, t, VK, OK_Ordinary, 688 fn->isTypeDependent(), 689 fn->isValueDependent(), 690 fn->containsUnexpandedParameterPack()), 691 NumArgs(numargs) { 692 693 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 694 SubExprs[FN] = fn; 695 for (unsigned i = 0; i != numargs; ++i) { 696 if (args[i]->isTypeDependent()) 697 ExprBits.TypeDependent = true; 698 if (args[i]->isValueDependent()) 699 ExprBits.ValueDependent = true; 700 if (args[i]->containsUnexpandedParameterPack()) 701 ExprBits.ContainsUnexpandedParameterPack = true; 702 703 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 704 } 705 706 CallExprBits.NumPreArgs = NumPreArgs; 707 RParenLoc = rparenloc; 708} 709 710CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 711 QualType t, ExprValueKind VK, SourceLocation rparenloc) 712 : Expr(CallExprClass, t, VK, OK_Ordinary, 713 fn->isTypeDependent(), 714 fn->isValueDependent(), 715 fn->containsUnexpandedParameterPack()), 716 NumArgs(numargs) { 717 718 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 719 SubExprs[FN] = fn; 720 for (unsigned i = 0; i != numargs; ++i) { 721 if (args[i]->isTypeDependent()) 722 ExprBits.TypeDependent = true; 723 if (args[i]->isValueDependent()) 724 ExprBits.ValueDependent = true; 725 if (args[i]->containsUnexpandedParameterPack()) 726 ExprBits.ContainsUnexpandedParameterPack = true; 727 728 SubExprs[i+PREARGS_START] = args[i]; 729 } 730 731 CallExprBits.NumPreArgs = 0; 732 RParenLoc = rparenloc; 733} 734 735CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 736 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 737 // FIXME: Why do we allocate this? 738 SubExprs = new (C) Stmt*[PREARGS_START]; 739 CallExprBits.NumPreArgs = 0; 740} 741 742CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 743 EmptyShell Empty) 744 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 745 // FIXME: Why do we allocate this? 746 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 747 CallExprBits.NumPreArgs = NumPreArgs; 748} 749 750Decl *CallExpr::getCalleeDecl() { 751 Expr *CEE = getCallee()->IgnoreParenCasts(); 752 // If we're calling a dereference, look at the pointer instead. 753 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 754 if (BO->isPtrMemOp()) 755 CEE = BO->getRHS()->IgnoreParenCasts(); 756 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 757 if (UO->getOpcode() == UO_Deref) 758 CEE = UO->getSubExpr()->IgnoreParenCasts(); 759 } 760 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 761 return DRE->getDecl(); 762 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 763 return ME->getMemberDecl(); 764 765 return 0; 766} 767 768FunctionDecl *CallExpr::getDirectCallee() { 769 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 770} 771 772/// setNumArgs - This changes the number of arguments present in this call. 773/// Any orphaned expressions are deleted by this, and any new operands are set 774/// to null. 775void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 776 // No change, just return. 777 if (NumArgs == getNumArgs()) return; 778 779 // If shrinking # arguments, just delete the extras and forgot them. 780 if (NumArgs < getNumArgs()) { 781 this->NumArgs = NumArgs; 782 return; 783 } 784 785 // Otherwise, we are growing the # arguments. New an bigger argument array. 786 unsigned NumPreArgs = getNumPreArgs(); 787 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 788 // Copy over args. 789 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 790 NewSubExprs[i] = SubExprs[i]; 791 // Null out new args. 792 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 793 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 794 NewSubExprs[i] = 0; 795 796 if (SubExprs) C.Deallocate(SubExprs); 797 SubExprs = NewSubExprs; 798 this->NumArgs = NumArgs; 799} 800 801/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 802/// not, return 0. 803unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const { 804 // All simple function calls (e.g. func()) are implicitly cast to pointer to 805 // function. As a result, we try and obtain the DeclRefExpr from the 806 // ImplicitCastExpr. 807 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 808 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 809 return 0; 810 811 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 812 if (!DRE) 813 return 0; 814 815 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 816 if (!FDecl) 817 return 0; 818 819 if (!FDecl->getIdentifier()) 820 return 0; 821 822 return FDecl->getBuiltinID(); 823} 824 825QualType CallExpr::getCallReturnType() const { 826 QualType CalleeType = getCallee()->getType(); 827 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 828 CalleeType = FnTypePtr->getPointeeType(); 829 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 830 CalleeType = BPT->getPointeeType(); 831 else if (const MemberPointerType *MPT 832 = CalleeType->getAs<MemberPointerType>()) 833 CalleeType = MPT->getPointeeType(); 834 835 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 836 return FnType->getResultType(); 837} 838 839OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 840 SourceLocation OperatorLoc, 841 TypeSourceInfo *tsi, 842 OffsetOfNode* compsPtr, unsigned numComps, 843 Expr** exprsPtr, unsigned numExprs, 844 SourceLocation RParenLoc) { 845 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 846 sizeof(OffsetOfNode) * numComps + 847 sizeof(Expr*) * numExprs); 848 849 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 850 exprsPtr, numExprs, RParenLoc); 851} 852 853OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 854 unsigned numComps, unsigned numExprs) { 855 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 856 sizeof(OffsetOfNode) * numComps + 857 sizeof(Expr*) * numExprs); 858 return new (Mem) OffsetOfExpr(numComps, numExprs); 859} 860 861OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 862 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 863 OffsetOfNode* compsPtr, unsigned numComps, 864 Expr** exprsPtr, unsigned numExprs, 865 SourceLocation RParenLoc) 866 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 867 /*TypeDependent=*/false, 868 /*ValueDependent=*/tsi->getType()->isDependentType(), 869 tsi->getType()->containsUnexpandedParameterPack()), 870 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 871 NumComps(numComps), NumExprs(numExprs) 872{ 873 for(unsigned i = 0; i < numComps; ++i) { 874 setComponent(i, compsPtr[i]); 875 } 876 877 for(unsigned i = 0; i < numExprs; ++i) { 878 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 879 ExprBits.ValueDependent = true; 880 if (exprsPtr[i]->containsUnexpandedParameterPack()) 881 ExprBits.ContainsUnexpandedParameterPack = true; 882 883 setIndexExpr(i, exprsPtr[i]); 884 } 885} 886 887IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 888 assert(getKind() == Field || getKind() == Identifier); 889 if (getKind() == Field) 890 return getField()->getIdentifier(); 891 892 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 893} 894 895MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 896 NestedNameSpecifier *qual, 897 SourceRange qualrange, 898 ValueDecl *memberdecl, 899 DeclAccessPair founddecl, 900 DeclarationNameInfo nameinfo, 901 const TemplateArgumentListInfo *targs, 902 QualType ty, 903 ExprValueKind vk, 904 ExprObjectKind ok) { 905 std::size_t Size = sizeof(MemberExpr); 906 907 bool hasQualOrFound = (qual != 0 || 908 founddecl.getDecl() != memberdecl || 909 founddecl.getAccess() != memberdecl->getAccess()); 910 if (hasQualOrFound) 911 Size += sizeof(MemberNameQualifier); 912 913 if (targs) 914 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 915 916 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 917 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 918 ty, vk, ok); 919 920 if (hasQualOrFound) { 921 if (qual && qual->isDependent()) { 922 E->setValueDependent(true); 923 E->setTypeDependent(true); 924 } 925 E->HasQualifierOrFoundDecl = true; 926 927 MemberNameQualifier *NQ = E->getMemberQualifier(); 928 NQ->NNS = qual; 929 NQ->Range = qualrange; 930 NQ->FoundDecl = founddecl; 931 } 932 933 if (targs) { 934 E->HasExplicitTemplateArgumentList = true; 935 E->getExplicitTemplateArgs().initializeFrom(*targs); 936 } 937 938 return E; 939} 940 941const char *CastExpr::getCastKindName() const { 942 switch (getCastKind()) { 943 case CK_Dependent: 944 return "Dependent"; 945 case CK_BitCast: 946 return "BitCast"; 947 case CK_LValueBitCast: 948 return "LValueBitCast"; 949 case CK_LValueToRValue: 950 return "LValueToRValue"; 951 case CK_GetObjCProperty: 952 return "GetObjCProperty"; 953 case CK_NoOp: 954 return "NoOp"; 955 case CK_BaseToDerived: 956 return "BaseToDerived"; 957 case CK_DerivedToBase: 958 return "DerivedToBase"; 959 case CK_UncheckedDerivedToBase: 960 return "UncheckedDerivedToBase"; 961 case CK_Dynamic: 962 return "Dynamic"; 963 case CK_ToUnion: 964 return "ToUnion"; 965 case CK_ArrayToPointerDecay: 966 return "ArrayToPointerDecay"; 967 case CK_FunctionToPointerDecay: 968 return "FunctionToPointerDecay"; 969 case CK_NullToMemberPointer: 970 return "NullToMemberPointer"; 971 case CK_NullToPointer: 972 return "NullToPointer"; 973 case CK_BaseToDerivedMemberPointer: 974 return "BaseToDerivedMemberPointer"; 975 case CK_DerivedToBaseMemberPointer: 976 return "DerivedToBaseMemberPointer"; 977 case CK_UserDefinedConversion: 978 return "UserDefinedConversion"; 979 case CK_ConstructorConversion: 980 return "ConstructorConversion"; 981 case CK_IntegralToPointer: 982 return "IntegralToPointer"; 983 case CK_PointerToIntegral: 984 return "PointerToIntegral"; 985 case CK_PointerToBoolean: 986 return "PointerToBoolean"; 987 case CK_ToVoid: 988 return "ToVoid"; 989 case CK_VectorSplat: 990 return "VectorSplat"; 991 case CK_IntegralCast: 992 return "IntegralCast"; 993 case CK_IntegralToBoolean: 994 return "IntegralToBoolean"; 995 case CK_IntegralToFloating: 996 return "IntegralToFloating"; 997 case CK_FloatingToIntegral: 998 return "FloatingToIntegral"; 999 case CK_FloatingCast: 1000 return "FloatingCast"; 1001 case CK_FloatingToBoolean: 1002 return "FloatingToBoolean"; 1003 case CK_MemberPointerToBoolean: 1004 return "MemberPointerToBoolean"; 1005 case CK_AnyPointerToObjCPointerCast: 1006 return "AnyPointerToObjCPointerCast"; 1007 case CK_AnyPointerToBlockPointerCast: 1008 return "AnyPointerToBlockPointerCast"; 1009 case CK_ObjCObjectLValueCast: 1010 return "ObjCObjectLValueCast"; 1011 case CK_FloatingRealToComplex: 1012 return "FloatingRealToComplex"; 1013 case CK_FloatingComplexToReal: 1014 return "FloatingComplexToReal"; 1015 case CK_FloatingComplexToBoolean: 1016 return "FloatingComplexToBoolean"; 1017 case CK_FloatingComplexCast: 1018 return "FloatingComplexCast"; 1019 case CK_FloatingComplexToIntegralComplex: 1020 return "FloatingComplexToIntegralComplex"; 1021 case CK_IntegralRealToComplex: 1022 return "IntegralRealToComplex"; 1023 case CK_IntegralComplexToReal: 1024 return "IntegralComplexToReal"; 1025 case CK_IntegralComplexToBoolean: 1026 return "IntegralComplexToBoolean"; 1027 case CK_IntegralComplexCast: 1028 return "IntegralComplexCast"; 1029 case CK_IntegralComplexToFloatingComplex: 1030 return "IntegralComplexToFloatingComplex"; 1031 } 1032 1033 llvm_unreachable("Unhandled cast kind!"); 1034 return 0; 1035} 1036 1037Expr *CastExpr::getSubExprAsWritten() { 1038 Expr *SubExpr = 0; 1039 CastExpr *E = this; 1040 do { 1041 SubExpr = E->getSubExpr(); 1042 1043 // Skip any temporary bindings; they're implicit. 1044 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1045 SubExpr = Binder->getSubExpr(); 1046 1047 // Conversions by constructor and conversion functions have a 1048 // subexpression describing the call; strip it off. 1049 if (E->getCastKind() == CK_ConstructorConversion) 1050 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1051 else if (E->getCastKind() == CK_UserDefinedConversion) 1052 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1053 1054 // If the subexpression we're left with is an implicit cast, look 1055 // through that, too. 1056 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1057 1058 return SubExpr; 1059} 1060 1061CXXBaseSpecifier **CastExpr::path_buffer() { 1062 switch (getStmtClass()) { 1063#define ABSTRACT_STMT(x) 1064#define CASTEXPR(Type, Base) \ 1065 case Stmt::Type##Class: \ 1066 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1067#define STMT(Type, Base) 1068#include "clang/AST/StmtNodes.inc" 1069 default: 1070 llvm_unreachable("non-cast expressions not possible here"); 1071 return 0; 1072 } 1073} 1074 1075void CastExpr::setCastPath(const CXXCastPath &Path) { 1076 assert(Path.size() == path_size()); 1077 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1078} 1079 1080ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1081 CastKind Kind, Expr *Operand, 1082 const CXXCastPath *BasePath, 1083 ExprValueKind VK) { 1084 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1085 void *Buffer = 1086 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1087 ImplicitCastExpr *E = 1088 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1089 if (PathSize) E->setCastPath(*BasePath); 1090 return E; 1091} 1092 1093ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1094 unsigned PathSize) { 1095 void *Buffer = 1096 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1097 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1098} 1099 1100 1101CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1102 ExprValueKind VK, CastKind K, Expr *Op, 1103 const CXXCastPath *BasePath, 1104 TypeSourceInfo *WrittenTy, 1105 SourceLocation L, SourceLocation R) { 1106 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1107 void *Buffer = 1108 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1109 CStyleCastExpr *E = 1110 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1111 if (PathSize) E->setCastPath(*BasePath); 1112 return E; 1113} 1114 1115CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1116 void *Buffer = 1117 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1118 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1119} 1120 1121/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1122/// corresponds to, e.g. "<<=". 1123const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1124 switch (Op) { 1125 case BO_PtrMemD: return ".*"; 1126 case BO_PtrMemI: return "->*"; 1127 case BO_Mul: return "*"; 1128 case BO_Div: return "/"; 1129 case BO_Rem: return "%"; 1130 case BO_Add: return "+"; 1131 case BO_Sub: return "-"; 1132 case BO_Shl: return "<<"; 1133 case BO_Shr: return ">>"; 1134 case BO_LT: return "<"; 1135 case BO_GT: return ">"; 1136 case BO_LE: return "<="; 1137 case BO_GE: return ">="; 1138 case BO_EQ: return "=="; 1139 case BO_NE: return "!="; 1140 case BO_And: return "&"; 1141 case BO_Xor: return "^"; 1142 case BO_Or: return "|"; 1143 case BO_LAnd: return "&&"; 1144 case BO_LOr: return "||"; 1145 case BO_Assign: return "="; 1146 case BO_MulAssign: return "*="; 1147 case BO_DivAssign: return "/="; 1148 case BO_RemAssign: return "%="; 1149 case BO_AddAssign: return "+="; 1150 case BO_SubAssign: return "-="; 1151 case BO_ShlAssign: return "<<="; 1152 case BO_ShrAssign: return ">>="; 1153 case BO_AndAssign: return "&="; 1154 case BO_XorAssign: return "^="; 1155 case BO_OrAssign: return "|="; 1156 case BO_Comma: return ","; 1157 } 1158 1159 return ""; 1160} 1161 1162BinaryOperatorKind 1163BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1164 switch (OO) { 1165 default: assert(false && "Not an overloadable binary operator"); 1166 case OO_Plus: return BO_Add; 1167 case OO_Minus: return BO_Sub; 1168 case OO_Star: return BO_Mul; 1169 case OO_Slash: return BO_Div; 1170 case OO_Percent: return BO_Rem; 1171 case OO_Caret: return BO_Xor; 1172 case OO_Amp: return BO_And; 1173 case OO_Pipe: return BO_Or; 1174 case OO_Equal: return BO_Assign; 1175 case OO_Less: return BO_LT; 1176 case OO_Greater: return BO_GT; 1177 case OO_PlusEqual: return BO_AddAssign; 1178 case OO_MinusEqual: return BO_SubAssign; 1179 case OO_StarEqual: return BO_MulAssign; 1180 case OO_SlashEqual: return BO_DivAssign; 1181 case OO_PercentEqual: return BO_RemAssign; 1182 case OO_CaretEqual: return BO_XorAssign; 1183 case OO_AmpEqual: return BO_AndAssign; 1184 case OO_PipeEqual: return BO_OrAssign; 1185 case OO_LessLess: return BO_Shl; 1186 case OO_GreaterGreater: return BO_Shr; 1187 case OO_LessLessEqual: return BO_ShlAssign; 1188 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1189 case OO_EqualEqual: return BO_EQ; 1190 case OO_ExclaimEqual: return BO_NE; 1191 case OO_LessEqual: return BO_LE; 1192 case OO_GreaterEqual: return BO_GE; 1193 case OO_AmpAmp: return BO_LAnd; 1194 case OO_PipePipe: return BO_LOr; 1195 case OO_Comma: return BO_Comma; 1196 case OO_ArrowStar: return BO_PtrMemI; 1197 } 1198} 1199 1200OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1201 static const OverloadedOperatorKind OverOps[] = { 1202 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1203 OO_Star, OO_Slash, OO_Percent, 1204 OO_Plus, OO_Minus, 1205 OO_LessLess, OO_GreaterGreater, 1206 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1207 OO_EqualEqual, OO_ExclaimEqual, 1208 OO_Amp, 1209 OO_Caret, 1210 OO_Pipe, 1211 OO_AmpAmp, 1212 OO_PipePipe, 1213 OO_Equal, OO_StarEqual, 1214 OO_SlashEqual, OO_PercentEqual, 1215 OO_PlusEqual, OO_MinusEqual, 1216 OO_LessLessEqual, OO_GreaterGreaterEqual, 1217 OO_AmpEqual, OO_CaretEqual, 1218 OO_PipeEqual, 1219 OO_Comma 1220 }; 1221 return OverOps[Opc]; 1222} 1223 1224InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1225 Expr **initExprs, unsigned numInits, 1226 SourceLocation rbraceloc) 1227 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1228 false), 1229 InitExprs(C, numInits), 1230 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1231 UnionFieldInit(0), HadArrayRangeDesignator(false) 1232{ 1233 for (unsigned I = 0; I != numInits; ++I) { 1234 if (initExprs[I]->isTypeDependent()) 1235 ExprBits.TypeDependent = true; 1236 if (initExprs[I]->isValueDependent()) 1237 ExprBits.ValueDependent = true; 1238 if (initExprs[I]->containsUnexpandedParameterPack()) 1239 ExprBits.ContainsUnexpandedParameterPack = true; 1240 } 1241 1242 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1243} 1244 1245void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1246 if (NumInits > InitExprs.size()) 1247 InitExprs.reserve(C, NumInits); 1248} 1249 1250void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1251 InitExprs.resize(C, NumInits, 0); 1252} 1253 1254Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1255 if (Init >= InitExprs.size()) { 1256 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1257 InitExprs.back() = expr; 1258 return 0; 1259 } 1260 1261 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1262 InitExprs[Init] = expr; 1263 return Result; 1264} 1265 1266SourceRange InitListExpr::getSourceRange() const { 1267 if (SyntacticForm) 1268 return SyntacticForm->getSourceRange(); 1269 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1270 if (Beg.isInvalid()) { 1271 // Find the first non-null initializer. 1272 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1273 E = InitExprs.end(); 1274 I != E; ++I) { 1275 if (Stmt *S = *I) { 1276 Beg = S->getLocStart(); 1277 break; 1278 } 1279 } 1280 } 1281 if (End.isInvalid()) { 1282 // Find the first non-null initializer from the end. 1283 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1284 E = InitExprs.rend(); 1285 I != E; ++I) { 1286 if (Stmt *S = *I) { 1287 End = S->getSourceRange().getEnd(); 1288 break; 1289 } 1290 } 1291 } 1292 return SourceRange(Beg, End); 1293} 1294 1295/// getFunctionType - Return the underlying function type for this block. 1296/// 1297const FunctionType *BlockExpr::getFunctionType() const { 1298 return getType()->getAs<BlockPointerType>()-> 1299 getPointeeType()->getAs<FunctionType>(); 1300} 1301 1302SourceLocation BlockExpr::getCaretLocation() const { 1303 return TheBlock->getCaretLocation(); 1304} 1305const Stmt *BlockExpr::getBody() const { 1306 return TheBlock->getBody(); 1307} 1308Stmt *BlockExpr::getBody() { 1309 return TheBlock->getBody(); 1310} 1311 1312 1313//===----------------------------------------------------------------------===// 1314// Generic Expression Routines 1315//===----------------------------------------------------------------------===// 1316 1317/// isUnusedResultAWarning - Return true if this immediate expression should 1318/// be warned about if the result is unused. If so, fill in Loc and Ranges 1319/// with location to warn on and the source range[s] to report with the 1320/// warning. 1321bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1322 SourceRange &R2, ASTContext &Ctx) const { 1323 // Don't warn if the expr is type dependent. The type could end up 1324 // instantiating to void. 1325 if (isTypeDependent()) 1326 return false; 1327 1328 switch (getStmtClass()) { 1329 default: 1330 if (getType()->isVoidType()) 1331 return false; 1332 Loc = getExprLoc(); 1333 R1 = getSourceRange(); 1334 return true; 1335 case ParenExprClass: 1336 return cast<ParenExpr>(this)->getSubExpr()-> 1337 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1338 case UnaryOperatorClass: { 1339 const UnaryOperator *UO = cast<UnaryOperator>(this); 1340 1341 switch (UO->getOpcode()) { 1342 default: break; 1343 case UO_PostInc: 1344 case UO_PostDec: 1345 case UO_PreInc: 1346 case UO_PreDec: // ++/-- 1347 return false; // Not a warning. 1348 case UO_Deref: 1349 // Dereferencing a volatile pointer is a side-effect. 1350 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1351 return false; 1352 break; 1353 case UO_Real: 1354 case UO_Imag: 1355 // accessing a piece of a volatile complex is a side-effect. 1356 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1357 .isVolatileQualified()) 1358 return false; 1359 break; 1360 case UO_Extension: 1361 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1362 } 1363 Loc = UO->getOperatorLoc(); 1364 R1 = UO->getSubExpr()->getSourceRange(); 1365 return true; 1366 } 1367 case BinaryOperatorClass: { 1368 const BinaryOperator *BO = cast<BinaryOperator>(this); 1369 switch (BO->getOpcode()) { 1370 default: 1371 break; 1372 // Consider the RHS of comma for side effects. LHS was checked by 1373 // Sema::CheckCommaOperands. 1374 case BO_Comma: 1375 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1376 // lvalue-ness) of an assignment written in a macro. 1377 if (IntegerLiteral *IE = 1378 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1379 if (IE->getValue() == 0) 1380 return false; 1381 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1382 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1383 case BO_LAnd: 1384 case BO_LOr: 1385 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1386 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1387 return false; 1388 break; 1389 } 1390 if (BO->isAssignmentOp()) 1391 return false; 1392 Loc = BO->getOperatorLoc(); 1393 R1 = BO->getLHS()->getSourceRange(); 1394 R2 = BO->getRHS()->getSourceRange(); 1395 return true; 1396 } 1397 case CompoundAssignOperatorClass: 1398 case VAArgExprClass: 1399 return false; 1400 1401 case ConditionalOperatorClass: { 1402 // The condition must be evaluated, but if either the LHS or RHS is a 1403 // warning, warn about them. 1404 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1405 if (Exp->getLHS() && 1406 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1407 return true; 1408 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1409 } 1410 1411 case MemberExprClass: 1412 // If the base pointer or element is to a volatile pointer/field, accessing 1413 // it is a side effect. 1414 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1415 return false; 1416 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1417 R1 = SourceRange(Loc, Loc); 1418 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1419 return true; 1420 1421 case ArraySubscriptExprClass: 1422 // If the base pointer or element is to a volatile pointer/field, accessing 1423 // it is a side effect. 1424 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1425 return false; 1426 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1427 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1428 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1429 return true; 1430 1431 case CallExprClass: 1432 case CXXOperatorCallExprClass: 1433 case CXXMemberCallExprClass: { 1434 // If this is a direct call, get the callee. 1435 const CallExpr *CE = cast<CallExpr>(this); 1436 if (const Decl *FD = CE->getCalleeDecl()) { 1437 // If the callee has attribute pure, const, or warn_unused_result, warn 1438 // about it. void foo() { strlen("bar"); } should warn. 1439 // 1440 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1441 // updated to match for QoI. 1442 if (FD->getAttr<WarnUnusedResultAttr>() || 1443 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1444 Loc = CE->getCallee()->getLocStart(); 1445 R1 = CE->getCallee()->getSourceRange(); 1446 1447 if (unsigned NumArgs = CE->getNumArgs()) 1448 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1449 CE->getArg(NumArgs-1)->getLocEnd()); 1450 return true; 1451 } 1452 } 1453 return false; 1454 } 1455 1456 case CXXTemporaryObjectExprClass: 1457 case CXXConstructExprClass: 1458 return false; 1459 1460 case ObjCMessageExprClass: { 1461 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1462 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1463 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1464 Loc = getExprLoc(); 1465 return true; 1466 } 1467 return false; 1468 } 1469 1470 case ObjCPropertyRefExprClass: 1471 Loc = getExprLoc(); 1472 R1 = getSourceRange(); 1473 return true; 1474 1475 case StmtExprClass: { 1476 // Statement exprs don't logically have side effects themselves, but are 1477 // sometimes used in macros in ways that give them a type that is unused. 1478 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1479 // however, if the result of the stmt expr is dead, we don't want to emit a 1480 // warning. 1481 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1482 if (!CS->body_empty()) { 1483 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1484 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1485 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1486 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1487 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1488 } 1489 1490 if (getType()->isVoidType()) 1491 return false; 1492 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1493 R1 = getSourceRange(); 1494 return true; 1495 } 1496 case CStyleCastExprClass: 1497 // If this is an explicit cast to void, allow it. People do this when they 1498 // think they know what they're doing :). 1499 if (getType()->isVoidType()) 1500 return false; 1501 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1502 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1503 return true; 1504 case CXXFunctionalCastExprClass: { 1505 if (getType()->isVoidType()) 1506 return false; 1507 const CastExpr *CE = cast<CastExpr>(this); 1508 1509 // If this is a cast to void or a constructor conversion, check the operand. 1510 // Otherwise, the result of the cast is unused. 1511 if (CE->getCastKind() == CK_ToVoid || 1512 CE->getCastKind() == CK_ConstructorConversion) 1513 return (cast<CastExpr>(this)->getSubExpr() 1514 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1515 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1516 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1517 return true; 1518 } 1519 1520 case ImplicitCastExprClass: 1521 // Check the operand, since implicit casts are inserted by Sema 1522 return (cast<ImplicitCastExpr>(this) 1523 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1524 1525 case CXXDefaultArgExprClass: 1526 return (cast<CXXDefaultArgExpr>(this) 1527 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1528 1529 case CXXNewExprClass: 1530 // FIXME: In theory, there might be new expressions that don't have side 1531 // effects (e.g. a placement new with an uninitialized POD). 1532 case CXXDeleteExprClass: 1533 return false; 1534 case CXXBindTemporaryExprClass: 1535 return (cast<CXXBindTemporaryExpr>(this) 1536 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1537 case ExprWithCleanupsClass: 1538 return (cast<ExprWithCleanups>(this) 1539 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1540 } 1541} 1542 1543/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1544/// returns true, if it is; false otherwise. 1545bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1546 switch (getStmtClass()) { 1547 default: 1548 return false; 1549 case ObjCIvarRefExprClass: 1550 return true; 1551 case Expr::UnaryOperatorClass: 1552 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1553 case ParenExprClass: 1554 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1555 case ImplicitCastExprClass: 1556 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1557 case CStyleCastExprClass: 1558 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1559 case DeclRefExprClass: { 1560 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1561 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1562 if (VD->hasGlobalStorage()) 1563 return true; 1564 QualType T = VD->getType(); 1565 // dereferencing to a pointer is always a gc'able candidate, 1566 // unless it is __weak. 1567 return T->isPointerType() && 1568 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1569 } 1570 return false; 1571 } 1572 case MemberExprClass: { 1573 const MemberExpr *M = cast<MemberExpr>(this); 1574 return M->getBase()->isOBJCGCCandidate(Ctx); 1575 } 1576 case ArraySubscriptExprClass: 1577 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1578 } 1579} 1580 1581bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1582 if (isTypeDependent()) 1583 return false; 1584 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1585} 1586 1587static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1588 Expr::CanThrowResult CT2) { 1589 // CanThrowResult constants are ordered so that the maximum is the correct 1590 // merge result. 1591 return CT1 > CT2 ? CT1 : CT2; 1592} 1593 1594static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1595 Expr *E = const_cast<Expr*>(CE); 1596 Expr::CanThrowResult R = Expr::CT_Cannot; 1597 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1598 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1599 } 1600 return R; 1601} 1602 1603static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1604 bool NullThrows = true) { 1605 if (!D) 1606 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1607 1608 // See if we can get a function type from the decl somehow. 1609 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1610 if (!VD) // If we have no clue what we're calling, assume the worst. 1611 return Expr::CT_Can; 1612 1613 // As an extension, we assume that __attribute__((nothrow)) functions don't 1614 // throw. 1615 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1616 return Expr::CT_Cannot; 1617 1618 QualType T = VD->getType(); 1619 const FunctionProtoType *FT; 1620 if ((FT = T->getAs<FunctionProtoType>())) { 1621 } else if (const PointerType *PT = T->getAs<PointerType>()) 1622 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1623 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1624 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1625 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1626 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1627 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1628 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1629 1630 if (!FT) 1631 return Expr::CT_Can; 1632 1633 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1634} 1635 1636static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1637 if (DC->isTypeDependent()) 1638 return Expr::CT_Dependent; 1639 1640 if (!DC->getTypeAsWritten()->isReferenceType()) 1641 return Expr::CT_Cannot; 1642 1643 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1644} 1645 1646static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1647 const CXXTypeidExpr *DC) { 1648 if (DC->isTypeOperand()) 1649 return Expr::CT_Cannot; 1650 1651 Expr *Op = DC->getExprOperand(); 1652 if (Op->isTypeDependent()) 1653 return Expr::CT_Dependent; 1654 1655 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1656 if (!RT) 1657 return Expr::CT_Cannot; 1658 1659 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1660 return Expr::CT_Cannot; 1661 1662 if (Op->Classify(C).isPRValue()) 1663 return Expr::CT_Cannot; 1664 1665 return Expr::CT_Can; 1666} 1667 1668Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1669 // C++ [expr.unary.noexcept]p3: 1670 // [Can throw] if in a potentially-evaluated context the expression would 1671 // contain: 1672 switch (getStmtClass()) { 1673 case CXXThrowExprClass: 1674 // - a potentially evaluated throw-expression 1675 return CT_Can; 1676 1677 case CXXDynamicCastExprClass: { 1678 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1679 // where T is a reference type, that requires a run-time check 1680 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1681 if (CT == CT_Can) 1682 return CT; 1683 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1684 } 1685 1686 case CXXTypeidExprClass: 1687 // - a potentially evaluated typeid expression applied to a glvalue 1688 // expression whose type is a polymorphic class type 1689 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1690 1691 // - a potentially evaluated call to a function, member function, function 1692 // pointer, or member function pointer that does not have a non-throwing 1693 // exception-specification 1694 case CallExprClass: 1695 case CXXOperatorCallExprClass: 1696 case CXXMemberCallExprClass: { 1697 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1698 if (CT == CT_Can) 1699 return CT; 1700 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1701 } 1702 1703 case CXXConstructExprClass: 1704 case CXXTemporaryObjectExprClass: { 1705 CanThrowResult CT = CanCalleeThrow( 1706 cast<CXXConstructExpr>(this)->getConstructor()); 1707 if (CT == CT_Can) 1708 return CT; 1709 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1710 } 1711 1712 case CXXNewExprClass: { 1713 CanThrowResult CT = MergeCanThrow( 1714 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1715 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1716 /*NullThrows*/false)); 1717 if (CT == CT_Can) 1718 return CT; 1719 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1720 } 1721 1722 case CXXDeleteExprClass: { 1723 CanThrowResult CT = CanCalleeThrow( 1724 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1725 if (CT == CT_Can) 1726 return CT; 1727 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1728 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1729 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1730 Arg = Cast->getSubExpr(); 1731 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1732 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1733 CanThrowResult CT2 = CanCalleeThrow( 1734 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1735 if (CT2 == CT_Can) 1736 return CT2; 1737 CT = MergeCanThrow(CT, CT2); 1738 } 1739 } 1740 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1741 } 1742 1743 case CXXBindTemporaryExprClass: { 1744 // The bound temporary has to be destroyed again, which might throw. 1745 CanThrowResult CT = CanCalleeThrow( 1746 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1747 if (CT == CT_Can) 1748 return CT; 1749 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1750 } 1751 1752 // ObjC message sends are like function calls, but never have exception 1753 // specs. 1754 case ObjCMessageExprClass: 1755 case ObjCPropertyRefExprClass: 1756 return CT_Can; 1757 1758 // Many other things have subexpressions, so we have to test those. 1759 // Some are simple: 1760 case ParenExprClass: 1761 case MemberExprClass: 1762 case CXXReinterpretCastExprClass: 1763 case CXXConstCastExprClass: 1764 case ConditionalOperatorClass: 1765 case CompoundLiteralExprClass: 1766 case ExtVectorElementExprClass: 1767 case InitListExprClass: 1768 case DesignatedInitExprClass: 1769 case ParenListExprClass: 1770 case VAArgExprClass: 1771 case CXXDefaultArgExprClass: 1772 case ExprWithCleanupsClass: 1773 case ObjCIvarRefExprClass: 1774 case ObjCIsaExprClass: 1775 case ShuffleVectorExprClass: 1776 return CanSubExprsThrow(C, this); 1777 1778 // Some might be dependent for other reasons. 1779 case UnaryOperatorClass: 1780 case ArraySubscriptExprClass: 1781 case ImplicitCastExprClass: 1782 case CStyleCastExprClass: 1783 case CXXStaticCastExprClass: 1784 case CXXFunctionalCastExprClass: 1785 case BinaryOperatorClass: 1786 case CompoundAssignOperatorClass: { 1787 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1788 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1789 } 1790 1791 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1792 case StmtExprClass: 1793 return CT_Can; 1794 1795 case ChooseExprClass: 1796 if (isTypeDependent() || isValueDependent()) 1797 return CT_Dependent; 1798 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1799 1800 // Some expressions are always dependent. 1801 case DependentScopeDeclRefExprClass: 1802 case CXXUnresolvedConstructExprClass: 1803 case CXXDependentScopeMemberExprClass: 1804 return CT_Dependent; 1805 1806 default: 1807 // All other expressions don't have subexpressions, or else they are 1808 // unevaluated. 1809 return CT_Cannot; 1810 } 1811} 1812 1813Expr* Expr::IgnoreParens() { 1814 Expr* E = this; 1815 while (true) { 1816 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1817 E = P->getSubExpr(); 1818 continue; 1819 } 1820 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1821 if (P->getOpcode() == UO_Extension) { 1822 E = P->getSubExpr(); 1823 continue; 1824 } 1825 } 1826 return E; 1827 } 1828} 1829 1830/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1831/// or CastExprs or ImplicitCastExprs, returning their operand. 1832Expr *Expr::IgnoreParenCasts() { 1833 Expr *E = this; 1834 while (true) { 1835 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1836 E = P->getSubExpr(); 1837 continue; 1838 } 1839 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1840 E = P->getSubExpr(); 1841 continue; 1842 } 1843 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1844 if (P->getOpcode() == UO_Extension) { 1845 E = P->getSubExpr(); 1846 continue; 1847 } 1848 } 1849 return E; 1850 } 1851} 1852 1853/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1854/// casts. This is intended purely as a temporary workaround for code 1855/// that hasn't yet been rewritten to do the right thing about those 1856/// casts, and may disappear along with the last internal use. 1857Expr *Expr::IgnoreParenLValueCasts() { 1858 Expr *E = this; 1859 while (true) { 1860 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1861 E = P->getSubExpr(); 1862 continue; 1863 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1864 if (P->getCastKind() == CK_LValueToRValue) { 1865 E = P->getSubExpr(); 1866 continue; 1867 } 1868 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1869 if (P->getOpcode() == UO_Extension) { 1870 E = P->getSubExpr(); 1871 continue; 1872 } 1873 } 1874 break; 1875 } 1876 return E; 1877} 1878 1879Expr *Expr::IgnoreParenImpCasts() { 1880 Expr *E = this; 1881 while (true) { 1882 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1883 E = P->getSubExpr(); 1884 continue; 1885 } 1886 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1887 E = P->getSubExpr(); 1888 continue; 1889 } 1890 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1891 if (P->getOpcode() == UO_Extension) { 1892 E = P->getSubExpr(); 1893 continue; 1894 } 1895 } 1896 return E; 1897 } 1898} 1899 1900/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1901/// value (including ptr->int casts of the same size). Strip off any 1902/// ParenExpr or CastExprs, returning their operand. 1903Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1904 Expr *E = this; 1905 while (true) { 1906 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1907 E = P->getSubExpr(); 1908 continue; 1909 } 1910 1911 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1912 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1913 // ptr<->int casts of the same width. We also ignore all identity casts. 1914 Expr *SE = P->getSubExpr(); 1915 1916 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1917 E = SE; 1918 continue; 1919 } 1920 1921 if ((E->getType()->isPointerType() || 1922 E->getType()->isIntegralType(Ctx)) && 1923 (SE->getType()->isPointerType() || 1924 SE->getType()->isIntegralType(Ctx)) && 1925 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1926 E = SE; 1927 continue; 1928 } 1929 } 1930 1931 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1932 if (P->getOpcode() == UO_Extension) { 1933 E = P->getSubExpr(); 1934 continue; 1935 } 1936 } 1937 1938 return E; 1939 } 1940} 1941 1942bool Expr::isDefaultArgument() const { 1943 const Expr *E = this; 1944 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1945 E = ICE->getSubExprAsWritten(); 1946 1947 return isa<CXXDefaultArgExpr>(E); 1948} 1949 1950/// \brief Skip over any no-op casts and any temporary-binding 1951/// expressions. 1952static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1953 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1954 if (ICE->getCastKind() == CK_NoOp) 1955 E = ICE->getSubExpr(); 1956 else 1957 break; 1958 } 1959 1960 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1961 E = BE->getSubExpr(); 1962 1963 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1964 if (ICE->getCastKind() == CK_NoOp) 1965 E = ICE->getSubExpr(); 1966 else 1967 break; 1968 } 1969 1970 return E->IgnoreParens(); 1971} 1972 1973/// isTemporaryObject - Determines if this expression produces a 1974/// temporary of the given class type. 1975bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1976 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1977 return false; 1978 1979 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1980 1981 // Temporaries are by definition pr-values of class type. 1982 if (!E->Classify(C).isPRValue()) { 1983 // In this context, property reference is a message call and is pr-value. 1984 if (!isa<ObjCPropertyRefExpr>(E)) 1985 return false; 1986 } 1987 1988 // Black-list a few cases which yield pr-values of class type that don't 1989 // refer to temporaries of that type: 1990 1991 // - implicit derived-to-base conversions 1992 if (isa<ImplicitCastExpr>(E)) { 1993 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1994 case CK_DerivedToBase: 1995 case CK_UncheckedDerivedToBase: 1996 return false; 1997 default: 1998 break; 1999 } 2000 } 2001 2002 // - member expressions (all) 2003 if (isa<MemberExpr>(E)) 2004 return false; 2005 2006 // - opaque values (all) 2007 if (isa<OpaqueValueExpr>(E)) 2008 return false; 2009 2010 return true; 2011} 2012 2013/// hasAnyTypeDependentArguments - Determines if any of the expressions 2014/// in Exprs is type-dependent. 2015bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 2016 for (unsigned I = 0; I < NumExprs; ++I) 2017 if (Exprs[I]->isTypeDependent()) 2018 return true; 2019 2020 return false; 2021} 2022 2023/// hasAnyValueDependentArguments - Determines if any of the expressions 2024/// in Exprs is value-dependent. 2025bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 2026 for (unsigned I = 0; I < NumExprs; ++I) 2027 if (Exprs[I]->isValueDependent()) 2028 return true; 2029 2030 return false; 2031} 2032 2033bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2034 // This function is attempting whether an expression is an initializer 2035 // which can be evaluated at compile-time. isEvaluatable handles most 2036 // of the cases, but it can't deal with some initializer-specific 2037 // expressions, and it can't deal with aggregates; we deal with those here, 2038 // and fall back to isEvaluatable for the other cases. 2039 2040 // If we ever capture reference-binding directly in the AST, we can 2041 // kill the second parameter. 2042 2043 if (IsForRef) { 2044 EvalResult Result; 2045 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2046 } 2047 2048 switch (getStmtClass()) { 2049 default: break; 2050 case StringLiteralClass: 2051 case ObjCStringLiteralClass: 2052 case ObjCEncodeExprClass: 2053 return true; 2054 case CXXTemporaryObjectExprClass: 2055 case CXXConstructExprClass: { 2056 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2057 2058 // Only if it's 2059 // 1) an application of the trivial default constructor or 2060 if (!CE->getConstructor()->isTrivial()) return false; 2061 if (!CE->getNumArgs()) return true; 2062 2063 // 2) an elidable trivial copy construction of an operand which is 2064 // itself a constant initializer. Note that we consider the 2065 // operand on its own, *not* as a reference binding. 2066 return CE->isElidable() && 2067 CE->getArg(0)->isConstantInitializer(Ctx, false); 2068 } 2069 case CompoundLiteralExprClass: { 2070 // This handles gcc's extension that allows global initializers like 2071 // "struct x {int x;} x = (struct x) {};". 2072 // FIXME: This accepts other cases it shouldn't! 2073 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2074 return Exp->isConstantInitializer(Ctx, false); 2075 } 2076 case InitListExprClass: { 2077 // FIXME: This doesn't deal with fields with reference types correctly. 2078 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2079 // to bitfields. 2080 const InitListExpr *Exp = cast<InitListExpr>(this); 2081 unsigned numInits = Exp->getNumInits(); 2082 for (unsigned i = 0; i < numInits; i++) { 2083 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2084 return false; 2085 } 2086 return true; 2087 } 2088 case ImplicitValueInitExprClass: 2089 return true; 2090 case ParenExprClass: 2091 return cast<ParenExpr>(this)->getSubExpr() 2092 ->isConstantInitializer(Ctx, IsForRef); 2093 case ChooseExprClass: 2094 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2095 ->isConstantInitializer(Ctx, IsForRef); 2096 case UnaryOperatorClass: { 2097 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2098 if (Exp->getOpcode() == UO_Extension) 2099 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2100 break; 2101 } 2102 case BinaryOperatorClass: { 2103 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2104 // but this handles the common case. 2105 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2106 if (Exp->getOpcode() == BO_Sub && 2107 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2108 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2109 return true; 2110 break; 2111 } 2112 case CXXFunctionalCastExprClass: 2113 case CXXStaticCastExprClass: 2114 case ImplicitCastExprClass: 2115 case CStyleCastExprClass: 2116 // Handle casts with a destination that's a struct or union; this 2117 // deals with both the gcc no-op struct cast extension and the 2118 // cast-to-union extension. 2119 if (getType()->isRecordType()) 2120 return cast<CastExpr>(this)->getSubExpr() 2121 ->isConstantInitializer(Ctx, false); 2122 2123 // Integer->integer casts can be handled here, which is important for 2124 // things like (int)(&&x-&&y). Scary but true. 2125 if (getType()->isIntegerType() && 2126 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2127 return cast<CastExpr>(this)->getSubExpr() 2128 ->isConstantInitializer(Ctx, false); 2129 2130 break; 2131 } 2132 return isEvaluatable(Ctx); 2133} 2134 2135/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2136/// pointer constant or not, as well as the specific kind of constant detected. 2137/// Null pointer constants can be integer constant expressions with the 2138/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2139/// (a GNU extension). 2140Expr::NullPointerConstantKind 2141Expr::isNullPointerConstant(ASTContext &Ctx, 2142 NullPointerConstantValueDependence NPC) const { 2143 if (isValueDependent()) { 2144 switch (NPC) { 2145 case NPC_NeverValueDependent: 2146 assert(false && "Unexpected value dependent expression!"); 2147 // If the unthinkable happens, fall through to the safest alternative. 2148 2149 case NPC_ValueDependentIsNull: 2150 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2151 return NPCK_ZeroInteger; 2152 else 2153 return NPCK_NotNull; 2154 2155 case NPC_ValueDependentIsNotNull: 2156 return NPCK_NotNull; 2157 } 2158 } 2159 2160 // Strip off a cast to void*, if it exists. Except in C++. 2161 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2162 if (!Ctx.getLangOptions().CPlusPlus) { 2163 // Check that it is a cast to void*. 2164 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2165 QualType Pointee = PT->getPointeeType(); 2166 if (!Pointee.hasQualifiers() && 2167 Pointee->isVoidType() && // to void* 2168 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2169 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2170 } 2171 } 2172 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2173 // Ignore the ImplicitCastExpr type entirely. 2174 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2175 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2176 // Accept ((void*)0) as a null pointer constant, as many other 2177 // implementations do. 2178 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2179 } else if (const CXXDefaultArgExpr *DefaultArg 2180 = dyn_cast<CXXDefaultArgExpr>(this)) { 2181 // See through default argument expressions 2182 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2183 } else if (isa<GNUNullExpr>(this)) { 2184 // The GNU __null extension is always a null pointer constant. 2185 return NPCK_GNUNull; 2186 } 2187 2188 // C++0x nullptr_t is always a null pointer constant. 2189 if (getType()->isNullPtrType()) 2190 return NPCK_CXX0X_nullptr; 2191 2192 if (const RecordType *UT = getType()->getAsUnionType()) 2193 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2194 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2195 const Expr *InitExpr = CLE->getInitializer(); 2196 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2197 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2198 } 2199 // This expression must be an integer type. 2200 if (!getType()->isIntegerType() || 2201 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2202 return NPCK_NotNull; 2203 2204 // If we have an integer constant expression, we need to *evaluate* it and 2205 // test for the value 0. 2206 llvm::APSInt Result; 2207 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0; 2208 2209 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull); 2210} 2211 2212/// \brief If this expression is an l-value for an Objective C 2213/// property, find the underlying property reference expression. 2214const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2215 const Expr *E = this; 2216 while (true) { 2217 assert((E->getValueKind() == VK_LValue && 2218 E->getObjectKind() == OK_ObjCProperty) && 2219 "expression is not a property reference"); 2220 E = E->IgnoreParenCasts(); 2221 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2222 if (BO->getOpcode() == BO_Comma) { 2223 E = BO->getRHS(); 2224 continue; 2225 } 2226 } 2227 2228 break; 2229 } 2230 2231 return cast<ObjCPropertyRefExpr>(E); 2232} 2233 2234FieldDecl *Expr::getBitField() { 2235 Expr *E = this->IgnoreParens(); 2236 2237 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2238 if (ICE->getCastKind() == CK_LValueToRValue || 2239 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2240 E = ICE->getSubExpr()->IgnoreParens(); 2241 else 2242 break; 2243 } 2244 2245 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2246 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2247 if (Field->isBitField()) 2248 return Field; 2249 2250 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2251 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2252 if (Field->isBitField()) 2253 return Field; 2254 2255 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2256 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2257 return BinOp->getLHS()->getBitField(); 2258 2259 return 0; 2260} 2261 2262bool Expr::refersToVectorElement() const { 2263 const Expr *E = this->IgnoreParens(); 2264 2265 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2266 if (ICE->getValueKind() != VK_RValue && 2267 ICE->getCastKind() == CK_NoOp) 2268 E = ICE->getSubExpr()->IgnoreParens(); 2269 else 2270 break; 2271 } 2272 2273 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2274 return ASE->getBase()->getType()->isVectorType(); 2275 2276 if (isa<ExtVectorElementExpr>(E)) 2277 return true; 2278 2279 return false; 2280} 2281 2282/// isArrow - Return true if the base expression is a pointer to vector, 2283/// return false if the base expression is a vector. 2284bool ExtVectorElementExpr::isArrow() const { 2285 return getBase()->getType()->isPointerType(); 2286} 2287 2288unsigned ExtVectorElementExpr::getNumElements() const { 2289 if (const VectorType *VT = getType()->getAs<VectorType>()) 2290 return VT->getNumElements(); 2291 return 1; 2292} 2293 2294/// containsDuplicateElements - Return true if any element access is repeated. 2295bool ExtVectorElementExpr::containsDuplicateElements() const { 2296 // FIXME: Refactor this code to an accessor on the AST node which returns the 2297 // "type" of component access, and share with code below and in Sema. 2298 llvm::StringRef Comp = Accessor->getName(); 2299 2300 // Halving swizzles do not contain duplicate elements. 2301 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2302 return false; 2303 2304 // Advance past s-char prefix on hex swizzles. 2305 if (Comp[0] == 's' || Comp[0] == 'S') 2306 Comp = Comp.substr(1); 2307 2308 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2309 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2310 return true; 2311 2312 return false; 2313} 2314 2315/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2316void ExtVectorElementExpr::getEncodedElementAccess( 2317 llvm::SmallVectorImpl<unsigned> &Elts) const { 2318 llvm::StringRef Comp = Accessor->getName(); 2319 if (Comp[0] == 's' || Comp[0] == 'S') 2320 Comp = Comp.substr(1); 2321 2322 bool isHi = Comp == "hi"; 2323 bool isLo = Comp == "lo"; 2324 bool isEven = Comp == "even"; 2325 bool isOdd = Comp == "odd"; 2326 2327 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2328 uint64_t Index; 2329 2330 if (isHi) 2331 Index = e + i; 2332 else if (isLo) 2333 Index = i; 2334 else if (isEven) 2335 Index = 2 * i; 2336 else if (isOdd) 2337 Index = 2 * i + 1; 2338 else 2339 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2340 2341 Elts.push_back(Index); 2342 } 2343} 2344 2345ObjCMessageExpr::ObjCMessageExpr(QualType T, 2346 ExprValueKind VK, 2347 SourceLocation LBracLoc, 2348 SourceLocation SuperLoc, 2349 bool IsInstanceSuper, 2350 QualType SuperType, 2351 Selector Sel, 2352 SourceLocation SelLoc, 2353 ObjCMethodDecl *Method, 2354 Expr **Args, unsigned NumArgs, 2355 SourceLocation RBracLoc) 2356 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2357 /*TypeDependent=*/false, /*ValueDependent=*/false, 2358 /*ContainsUnexpandedParameterPack=*/false), 2359 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2360 HasMethod(Method != 0), SuperLoc(SuperLoc), 2361 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2362 : Sel.getAsOpaquePtr())), 2363 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2364{ 2365 setReceiverPointer(SuperType.getAsOpaquePtr()); 2366 if (NumArgs) 2367 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2368} 2369 2370ObjCMessageExpr::ObjCMessageExpr(QualType T, 2371 ExprValueKind VK, 2372 SourceLocation LBracLoc, 2373 TypeSourceInfo *Receiver, 2374 Selector Sel, 2375 SourceLocation SelLoc, 2376 ObjCMethodDecl *Method, 2377 Expr **Args, unsigned NumArgs, 2378 SourceLocation RBracLoc) 2379 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2380 T->isDependentType(), T->containsUnexpandedParameterPack()), 2381 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2382 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2383 : Sel.getAsOpaquePtr())), 2384 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2385{ 2386 setReceiverPointer(Receiver); 2387 Expr **MyArgs = getArgs(); 2388 for (unsigned I = 0; I != NumArgs; ++I) { 2389 if (Args[I]->isTypeDependent()) 2390 ExprBits.TypeDependent = true; 2391 if (Args[I]->isValueDependent()) 2392 ExprBits.ValueDependent = true; 2393 if (Args[I]->containsUnexpandedParameterPack()) 2394 ExprBits.ContainsUnexpandedParameterPack = true; 2395 2396 MyArgs[I] = Args[I]; 2397 } 2398} 2399 2400ObjCMessageExpr::ObjCMessageExpr(QualType T, 2401 ExprValueKind VK, 2402 SourceLocation LBracLoc, 2403 Expr *Receiver, 2404 Selector Sel, 2405 SourceLocation SelLoc, 2406 ObjCMethodDecl *Method, 2407 Expr **Args, unsigned NumArgs, 2408 SourceLocation RBracLoc) 2409 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2410 Receiver->isTypeDependent(), 2411 Receiver->containsUnexpandedParameterPack()), 2412 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2413 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2414 : Sel.getAsOpaquePtr())), 2415 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2416{ 2417 setReceiverPointer(Receiver); 2418 Expr **MyArgs = getArgs(); 2419 for (unsigned I = 0; I != NumArgs; ++I) { 2420 if (Args[I]->isTypeDependent()) 2421 ExprBits.TypeDependent = true; 2422 if (Args[I]->isValueDependent()) 2423 ExprBits.ValueDependent = true; 2424 if (Args[I]->containsUnexpandedParameterPack()) 2425 ExprBits.ContainsUnexpandedParameterPack = true; 2426 2427 MyArgs[I] = Args[I]; 2428 } 2429} 2430 2431ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2432 ExprValueKind VK, 2433 SourceLocation LBracLoc, 2434 SourceLocation SuperLoc, 2435 bool IsInstanceSuper, 2436 QualType SuperType, 2437 Selector Sel, 2438 SourceLocation SelLoc, 2439 ObjCMethodDecl *Method, 2440 Expr **Args, unsigned NumArgs, 2441 SourceLocation RBracLoc) { 2442 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2443 NumArgs * sizeof(Expr *); 2444 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2445 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2446 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2447 RBracLoc); 2448} 2449 2450ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2451 ExprValueKind VK, 2452 SourceLocation LBracLoc, 2453 TypeSourceInfo *Receiver, 2454 Selector Sel, 2455 SourceLocation SelLoc, 2456 ObjCMethodDecl *Method, 2457 Expr **Args, unsigned NumArgs, 2458 SourceLocation RBracLoc) { 2459 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2460 NumArgs * sizeof(Expr *); 2461 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2462 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2463 Method, Args, NumArgs, RBracLoc); 2464} 2465 2466ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2467 ExprValueKind VK, 2468 SourceLocation LBracLoc, 2469 Expr *Receiver, 2470 Selector Sel, 2471 SourceLocation SelLoc, 2472 ObjCMethodDecl *Method, 2473 Expr **Args, unsigned NumArgs, 2474 SourceLocation RBracLoc) { 2475 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2476 NumArgs * sizeof(Expr *); 2477 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2478 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2479 Method, Args, NumArgs, RBracLoc); 2480} 2481 2482ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2483 unsigned NumArgs) { 2484 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2485 NumArgs * sizeof(Expr *); 2486 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2487 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2488} 2489 2490SourceRange ObjCMessageExpr::getReceiverRange() const { 2491 switch (getReceiverKind()) { 2492 case Instance: 2493 return getInstanceReceiver()->getSourceRange(); 2494 2495 case Class: 2496 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2497 2498 case SuperInstance: 2499 case SuperClass: 2500 return getSuperLoc(); 2501 } 2502 2503 return SourceLocation(); 2504} 2505 2506Selector ObjCMessageExpr::getSelector() const { 2507 if (HasMethod) 2508 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2509 ->getSelector(); 2510 return Selector(SelectorOrMethod); 2511} 2512 2513ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2514 switch (getReceiverKind()) { 2515 case Instance: 2516 if (const ObjCObjectPointerType *Ptr 2517 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2518 return Ptr->getInterfaceDecl(); 2519 break; 2520 2521 case Class: 2522 if (const ObjCObjectType *Ty 2523 = getClassReceiver()->getAs<ObjCObjectType>()) 2524 return Ty->getInterface(); 2525 break; 2526 2527 case SuperInstance: 2528 if (const ObjCObjectPointerType *Ptr 2529 = getSuperType()->getAs<ObjCObjectPointerType>()) 2530 return Ptr->getInterfaceDecl(); 2531 break; 2532 2533 case SuperClass: 2534 if (const ObjCObjectType *Iface 2535 = getSuperType()->getAs<ObjCObjectType>()) 2536 return Iface->getInterface(); 2537 break; 2538 } 2539 2540 return 0; 2541} 2542 2543bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2544 return getCond()->EvaluateAsInt(C) != 0; 2545} 2546 2547ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2548 QualType Type, SourceLocation BLoc, 2549 SourceLocation RP) 2550 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2551 Type->isDependentType(), Type->isDependentType(), 2552 Type->containsUnexpandedParameterPack()), 2553 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2554{ 2555 SubExprs = new (C) Stmt*[nexpr]; 2556 for (unsigned i = 0; i < nexpr; i++) { 2557 if (args[i]->isTypeDependent()) 2558 ExprBits.TypeDependent = true; 2559 if (args[i]->isValueDependent()) 2560 ExprBits.ValueDependent = true; 2561 if (args[i]->containsUnexpandedParameterPack()) 2562 ExprBits.ContainsUnexpandedParameterPack = true; 2563 2564 SubExprs[i] = args[i]; 2565 } 2566} 2567 2568void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2569 unsigned NumExprs) { 2570 if (SubExprs) C.Deallocate(SubExprs); 2571 2572 SubExprs = new (C) Stmt* [NumExprs]; 2573 this->NumExprs = NumExprs; 2574 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2575} 2576 2577//===----------------------------------------------------------------------===// 2578// DesignatedInitExpr 2579//===----------------------------------------------------------------------===// 2580 2581IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2582 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2583 if (Field.NameOrField & 0x01) 2584 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2585 else 2586 return getField()->getIdentifier(); 2587} 2588 2589DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2590 unsigned NumDesignators, 2591 const Designator *Designators, 2592 SourceLocation EqualOrColonLoc, 2593 bool GNUSyntax, 2594 Expr **IndexExprs, 2595 unsigned NumIndexExprs, 2596 Expr *Init) 2597 : Expr(DesignatedInitExprClass, Ty, 2598 Init->getValueKind(), Init->getObjectKind(), 2599 Init->isTypeDependent(), Init->isValueDependent(), 2600 Init->containsUnexpandedParameterPack()), 2601 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2602 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2603 this->Designators = new (C) Designator[NumDesignators]; 2604 2605 // Record the initializer itself. 2606 child_range Child = children(); 2607 *Child++ = Init; 2608 2609 // Copy the designators and their subexpressions, computing 2610 // value-dependence along the way. 2611 unsigned IndexIdx = 0; 2612 for (unsigned I = 0; I != NumDesignators; ++I) { 2613 this->Designators[I] = Designators[I]; 2614 2615 if (this->Designators[I].isArrayDesignator()) { 2616 // Compute type- and value-dependence. 2617 Expr *Index = IndexExprs[IndexIdx]; 2618 if (Index->isTypeDependent() || Index->isValueDependent()) 2619 ExprBits.ValueDependent = true; 2620 2621 // Propagate unexpanded parameter packs. 2622 if (Index->containsUnexpandedParameterPack()) 2623 ExprBits.ContainsUnexpandedParameterPack = true; 2624 2625 // Copy the index expressions into permanent storage. 2626 *Child++ = IndexExprs[IndexIdx++]; 2627 } else if (this->Designators[I].isArrayRangeDesignator()) { 2628 // Compute type- and value-dependence. 2629 Expr *Start = IndexExprs[IndexIdx]; 2630 Expr *End = IndexExprs[IndexIdx + 1]; 2631 if (Start->isTypeDependent() || Start->isValueDependent() || 2632 End->isTypeDependent() || End->isValueDependent()) 2633 ExprBits.ValueDependent = true; 2634 2635 // Propagate unexpanded parameter packs. 2636 if (Start->containsUnexpandedParameterPack() || 2637 End->containsUnexpandedParameterPack()) 2638 ExprBits.ContainsUnexpandedParameterPack = true; 2639 2640 // Copy the start/end expressions into permanent storage. 2641 *Child++ = IndexExprs[IndexIdx++]; 2642 *Child++ = IndexExprs[IndexIdx++]; 2643 } 2644 } 2645 2646 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2647} 2648 2649DesignatedInitExpr * 2650DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2651 unsigned NumDesignators, 2652 Expr **IndexExprs, unsigned NumIndexExprs, 2653 SourceLocation ColonOrEqualLoc, 2654 bool UsesColonSyntax, Expr *Init) { 2655 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2656 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2657 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2658 ColonOrEqualLoc, UsesColonSyntax, 2659 IndexExprs, NumIndexExprs, Init); 2660} 2661 2662DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2663 unsigned NumIndexExprs) { 2664 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2665 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2666 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2667} 2668 2669void DesignatedInitExpr::setDesignators(ASTContext &C, 2670 const Designator *Desigs, 2671 unsigned NumDesigs) { 2672 Designators = new (C) Designator[NumDesigs]; 2673 NumDesignators = NumDesigs; 2674 for (unsigned I = 0; I != NumDesigs; ++I) 2675 Designators[I] = Desigs[I]; 2676} 2677 2678SourceRange DesignatedInitExpr::getSourceRange() const { 2679 SourceLocation StartLoc; 2680 Designator &First = 2681 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2682 if (First.isFieldDesignator()) { 2683 if (GNUSyntax) 2684 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2685 else 2686 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2687 } else 2688 StartLoc = 2689 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2690 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2691} 2692 2693Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2694 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2695 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2696 Ptr += sizeof(DesignatedInitExpr); 2697 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2698 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2699} 2700 2701Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2702 assert(D.Kind == Designator::ArrayRangeDesignator && 2703 "Requires array range designator"); 2704 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2705 Ptr += sizeof(DesignatedInitExpr); 2706 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2707 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2708} 2709 2710Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2711 assert(D.Kind == Designator::ArrayRangeDesignator && 2712 "Requires array range designator"); 2713 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2714 Ptr += sizeof(DesignatedInitExpr); 2715 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2716 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2717} 2718 2719/// \brief Replaces the designator at index @p Idx with the series 2720/// of designators in [First, Last). 2721void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2722 const Designator *First, 2723 const Designator *Last) { 2724 unsigned NumNewDesignators = Last - First; 2725 if (NumNewDesignators == 0) { 2726 std::copy_backward(Designators + Idx + 1, 2727 Designators + NumDesignators, 2728 Designators + Idx); 2729 --NumNewDesignators; 2730 return; 2731 } else if (NumNewDesignators == 1) { 2732 Designators[Idx] = *First; 2733 return; 2734 } 2735 2736 Designator *NewDesignators 2737 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2738 std::copy(Designators, Designators + Idx, NewDesignators); 2739 std::copy(First, Last, NewDesignators + Idx); 2740 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2741 NewDesignators + Idx + NumNewDesignators); 2742 Designators = NewDesignators; 2743 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2744} 2745 2746ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2747 Expr **exprs, unsigned nexprs, 2748 SourceLocation rparenloc) 2749 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2750 false, false, false), 2751 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2752 2753 Exprs = new (C) Stmt*[nexprs]; 2754 for (unsigned i = 0; i != nexprs; ++i) { 2755 if (exprs[i]->isTypeDependent()) 2756 ExprBits.TypeDependent = true; 2757 if (exprs[i]->isValueDependent()) 2758 ExprBits.ValueDependent = true; 2759 if (exprs[i]->containsUnexpandedParameterPack()) 2760 ExprBits.ContainsUnexpandedParameterPack = true; 2761 2762 Exprs[i] = exprs[i]; 2763 } 2764} 2765 2766const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 2767 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 2768 e = ewc->getSubExpr(); 2769 e = cast<CXXConstructExpr>(e)->getArg(0); 2770 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2771 e = ice->getSubExpr(); 2772 return cast<OpaqueValueExpr>(e); 2773} 2774 2775//===----------------------------------------------------------------------===// 2776// ExprIterator. 2777//===----------------------------------------------------------------------===// 2778 2779Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2780Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2781Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2782const Expr* ConstExprIterator::operator[](size_t idx) const { 2783 return cast<Expr>(I[idx]); 2784} 2785const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2786const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2787 2788//===----------------------------------------------------------------------===// 2789// Child Iterators for iterating over subexpressions/substatements 2790//===----------------------------------------------------------------------===// 2791 2792// SizeOfAlignOfExpr 2793Stmt::child_range SizeOfAlignOfExpr::children() { 2794 // If this is of a type and the type is a VLA type (and not a typedef), the 2795 // size expression of the VLA needs to be treated as an executable expression. 2796 // Why isn't this weirdness documented better in StmtIterator? 2797 if (isArgumentType()) { 2798 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 2799 getArgumentType().getTypePtr())) 2800 return child_range(child_iterator(T), child_iterator()); 2801 return child_range(); 2802 } 2803 return child_range(&Argument.Ex, &Argument.Ex + 1); 2804} 2805 2806// ObjCMessageExpr 2807Stmt::child_range ObjCMessageExpr::children() { 2808 Stmt **begin; 2809 if (getReceiverKind() == Instance) 2810 begin = reinterpret_cast<Stmt **>(this + 1); 2811 else 2812 begin = reinterpret_cast<Stmt **>(getArgs()); 2813 return child_range(begin, 2814 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 2815} 2816 2817// Blocks 2818BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 2819 SourceLocation l, bool ByRef, 2820 bool constAdded) 2821 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, 2822 d->isParameterPack()), 2823 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 2824{ 2825 bool TypeDependent = false; 2826 bool ValueDependent = false; 2827 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent); 2828 ExprBits.TypeDependent = TypeDependent; 2829 ExprBits.ValueDependent = ValueDependent; 2830} 2831 2832