Expr.cpp revision 2882eca5a184c78f793188083f6ce539740a5cf2
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 839SourceRange CallExpr::getSourceRange() const { 840 if (isa<CXXOperatorCallExpr>(this)) 841 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 842 843 SourceLocation begin = getCallee()->getLocStart(); 844 if (begin.isInvalid() && getNumArgs() > 0) 845 begin = getArg(0)->getLocStart(); 846 SourceLocation end = getRParenLoc(); 847 if (end.isInvalid() && getNumArgs() > 0) 848 end = getArg(getNumArgs() - 1)->getLocEnd(); 849 return SourceRange(begin, end); 850} 851 852OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 853 SourceLocation OperatorLoc, 854 TypeSourceInfo *tsi, 855 OffsetOfNode* compsPtr, unsigned numComps, 856 Expr** exprsPtr, unsigned numExprs, 857 SourceLocation RParenLoc) { 858 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 859 sizeof(OffsetOfNode) * numComps + 860 sizeof(Expr*) * numExprs); 861 862 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 863 exprsPtr, numExprs, RParenLoc); 864} 865 866OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 867 unsigned numComps, unsigned numExprs) { 868 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 869 sizeof(OffsetOfNode) * numComps + 870 sizeof(Expr*) * numExprs); 871 return new (Mem) OffsetOfExpr(numComps, numExprs); 872} 873 874OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 875 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 876 OffsetOfNode* compsPtr, unsigned numComps, 877 Expr** exprsPtr, unsigned numExprs, 878 SourceLocation RParenLoc) 879 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 880 /*TypeDependent=*/false, 881 /*ValueDependent=*/tsi->getType()->isDependentType(), 882 tsi->getType()->containsUnexpandedParameterPack()), 883 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 884 NumComps(numComps), NumExprs(numExprs) 885{ 886 for(unsigned i = 0; i < numComps; ++i) { 887 setComponent(i, compsPtr[i]); 888 } 889 890 for(unsigned i = 0; i < numExprs; ++i) { 891 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 892 ExprBits.ValueDependent = true; 893 if (exprsPtr[i]->containsUnexpandedParameterPack()) 894 ExprBits.ContainsUnexpandedParameterPack = true; 895 896 setIndexExpr(i, exprsPtr[i]); 897 } 898} 899 900IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 901 assert(getKind() == Field || getKind() == Identifier); 902 if (getKind() == Field) 903 return getField()->getIdentifier(); 904 905 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 906} 907 908MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 909 NestedNameSpecifier *qual, 910 SourceRange qualrange, 911 ValueDecl *memberdecl, 912 DeclAccessPair founddecl, 913 DeclarationNameInfo nameinfo, 914 const TemplateArgumentListInfo *targs, 915 QualType ty, 916 ExprValueKind vk, 917 ExprObjectKind ok) { 918 std::size_t Size = sizeof(MemberExpr); 919 920 bool hasQualOrFound = (qual != 0 || 921 founddecl.getDecl() != memberdecl || 922 founddecl.getAccess() != memberdecl->getAccess()); 923 if (hasQualOrFound) 924 Size += sizeof(MemberNameQualifier); 925 926 if (targs) 927 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 928 929 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 930 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 931 ty, vk, ok); 932 933 if (hasQualOrFound) { 934 if (qual && qual->isDependent()) { 935 E->setValueDependent(true); 936 E->setTypeDependent(true); 937 } 938 E->HasQualifierOrFoundDecl = true; 939 940 MemberNameQualifier *NQ = E->getMemberQualifier(); 941 NQ->NNS = qual; 942 NQ->Range = qualrange; 943 NQ->FoundDecl = founddecl; 944 } 945 946 if (targs) { 947 E->HasExplicitTemplateArgumentList = true; 948 E->getExplicitTemplateArgs().initializeFrom(*targs); 949 } 950 951 return E; 952} 953 954const char *CastExpr::getCastKindName() const { 955 switch (getCastKind()) { 956 case CK_Dependent: 957 return "Dependent"; 958 case CK_BitCast: 959 return "BitCast"; 960 case CK_LValueBitCast: 961 return "LValueBitCast"; 962 case CK_LValueToRValue: 963 return "LValueToRValue"; 964 case CK_GetObjCProperty: 965 return "GetObjCProperty"; 966 case CK_NoOp: 967 return "NoOp"; 968 case CK_BaseToDerived: 969 return "BaseToDerived"; 970 case CK_DerivedToBase: 971 return "DerivedToBase"; 972 case CK_UncheckedDerivedToBase: 973 return "UncheckedDerivedToBase"; 974 case CK_Dynamic: 975 return "Dynamic"; 976 case CK_ToUnion: 977 return "ToUnion"; 978 case CK_ArrayToPointerDecay: 979 return "ArrayToPointerDecay"; 980 case CK_FunctionToPointerDecay: 981 return "FunctionToPointerDecay"; 982 case CK_NullToMemberPointer: 983 return "NullToMemberPointer"; 984 case CK_NullToPointer: 985 return "NullToPointer"; 986 case CK_BaseToDerivedMemberPointer: 987 return "BaseToDerivedMemberPointer"; 988 case CK_DerivedToBaseMemberPointer: 989 return "DerivedToBaseMemberPointer"; 990 case CK_UserDefinedConversion: 991 return "UserDefinedConversion"; 992 case CK_ConstructorConversion: 993 return "ConstructorConversion"; 994 case CK_IntegralToPointer: 995 return "IntegralToPointer"; 996 case CK_PointerToIntegral: 997 return "PointerToIntegral"; 998 case CK_PointerToBoolean: 999 return "PointerToBoolean"; 1000 case CK_ToVoid: 1001 return "ToVoid"; 1002 case CK_VectorSplat: 1003 return "VectorSplat"; 1004 case CK_IntegralCast: 1005 return "IntegralCast"; 1006 case CK_IntegralToBoolean: 1007 return "IntegralToBoolean"; 1008 case CK_IntegralToFloating: 1009 return "IntegralToFloating"; 1010 case CK_FloatingToIntegral: 1011 return "FloatingToIntegral"; 1012 case CK_FloatingCast: 1013 return "FloatingCast"; 1014 case CK_FloatingToBoolean: 1015 return "FloatingToBoolean"; 1016 case CK_MemberPointerToBoolean: 1017 return "MemberPointerToBoolean"; 1018 case CK_AnyPointerToObjCPointerCast: 1019 return "AnyPointerToObjCPointerCast"; 1020 case CK_AnyPointerToBlockPointerCast: 1021 return "AnyPointerToBlockPointerCast"; 1022 case CK_ObjCObjectLValueCast: 1023 return "ObjCObjectLValueCast"; 1024 case CK_FloatingRealToComplex: 1025 return "FloatingRealToComplex"; 1026 case CK_FloatingComplexToReal: 1027 return "FloatingComplexToReal"; 1028 case CK_FloatingComplexToBoolean: 1029 return "FloatingComplexToBoolean"; 1030 case CK_FloatingComplexCast: 1031 return "FloatingComplexCast"; 1032 case CK_FloatingComplexToIntegralComplex: 1033 return "FloatingComplexToIntegralComplex"; 1034 case CK_IntegralRealToComplex: 1035 return "IntegralRealToComplex"; 1036 case CK_IntegralComplexToReal: 1037 return "IntegralComplexToReal"; 1038 case CK_IntegralComplexToBoolean: 1039 return "IntegralComplexToBoolean"; 1040 case CK_IntegralComplexCast: 1041 return "IntegralComplexCast"; 1042 case CK_IntegralComplexToFloatingComplex: 1043 return "IntegralComplexToFloatingComplex"; 1044 } 1045 1046 llvm_unreachable("Unhandled cast kind!"); 1047 return 0; 1048} 1049 1050Expr *CastExpr::getSubExprAsWritten() { 1051 Expr *SubExpr = 0; 1052 CastExpr *E = this; 1053 do { 1054 SubExpr = E->getSubExpr(); 1055 1056 // Skip any temporary bindings; they're implicit. 1057 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1058 SubExpr = Binder->getSubExpr(); 1059 1060 // Conversions by constructor and conversion functions have a 1061 // subexpression describing the call; strip it off. 1062 if (E->getCastKind() == CK_ConstructorConversion) 1063 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1064 else if (E->getCastKind() == CK_UserDefinedConversion) 1065 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1066 1067 // If the subexpression we're left with is an implicit cast, look 1068 // through that, too. 1069 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1070 1071 return SubExpr; 1072} 1073 1074CXXBaseSpecifier **CastExpr::path_buffer() { 1075 switch (getStmtClass()) { 1076#define ABSTRACT_STMT(x) 1077#define CASTEXPR(Type, Base) \ 1078 case Stmt::Type##Class: \ 1079 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1080#define STMT(Type, Base) 1081#include "clang/AST/StmtNodes.inc" 1082 default: 1083 llvm_unreachable("non-cast expressions not possible here"); 1084 return 0; 1085 } 1086} 1087 1088void CastExpr::setCastPath(const CXXCastPath &Path) { 1089 assert(Path.size() == path_size()); 1090 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1091} 1092 1093ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1094 CastKind Kind, Expr *Operand, 1095 const CXXCastPath *BasePath, 1096 ExprValueKind VK) { 1097 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1098 void *Buffer = 1099 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1100 ImplicitCastExpr *E = 1101 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1102 if (PathSize) E->setCastPath(*BasePath); 1103 return E; 1104} 1105 1106ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1107 unsigned PathSize) { 1108 void *Buffer = 1109 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1110 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1111} 1112 1113 1114CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1115 ExprValueKind VK, CastKind K, Expr *Op, 1116 const CXXCastPath *BasePath, 1117 TypeSourceInfo *WrittenTy, 1118 SourceLocation L, SourceLocation R) { 1119 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1120 void *Buffer = 1121 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1122 CStyleCastExpr *E = 1123 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1124 if (PathSize) E->setCastPath(*BasePath); 1125 return E; 1126} 1127 1128CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1129 void *Buffer = 1130 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1131 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1132} 1133 1134/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1135/// corresponds to, e.g. "<<=". 1136const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1137 switch (Op) { 1138 case BO_PtrMemD: return ".*"; 1139 case BO_PtrMemI: return "->*"; 1140 case BO_Mul: return "*"; 1141 case BO_Div: return "/"; 1142 case BO_Rem: return "%"; 1143 case BO_Add: return "+"; 1144 case BO_Sub: return "-"; 1145 case BO_Shl: return "<<"; 1146 case BO_Shr: return ">>"; 1147 case BO_LT: return "<"; 1148 case BO_GT: return ">"; 1149 case BO_LE: return "<="; 1150 case BO_GE: return ">="; 1151 case BO_EQ: return "=="; 1152 case BO_NE: return "!="; 1153 case BO_And: return "&"; 1154 case BO_Xor: return "^"; 1155 case BO_Or: return "|"; 1156 case BO_LAnd: return "&&"; 1157 case BO_LOr: return "||"; 1158 case BO_Assign: return "="; 1159 case BO_MulAssign: return "*="; 1160 case BO_DivAssign: return "/="; 1161 case BO_RemAssign: return "%="; 1162 case BO_AddAssign: return "+="; 1163 case BO_SubAssign: return "-="; 1164 case BO_ShlAssign: return "<<="; 1165 case BO_ShrAssign: return ">>="; 1166 case BO_AndAssign: return "&="; 1167 case BO_XorAssign: return "^="; 1168 case BO_OrAssign: return "|="; 1169 case BO_Comma: return ","; 1170 } 1171 1172 return ""; 1173} 1174 1175BinaryOperatorKind 1176BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1177 switch (OO) { 1178 default: assert(false && "Not an overloadable binary operator"); 1179 case OO_Plus: return BO_Add; 1180 case OO_Minus: return BO_Sub; 1181 case OO_Star: return BO_Mul; 1182 case OO_Slash: return BO_Div; 1183 case OO_Percent: return BO_Rem; 1184 case OO_Caret: return BO_Xor; 1185 case OO_Amp: return BO_And; 1186 case OO_Pipe: return BO_Or; 1187 case OO_Equal: return BO_Assign; 1188 case OO_Less: return BO_LT; 1189 case OO_Greater: return BO_GT; 1190 case OO_PlusEqual: return BO_AddAssign; 1191 case OO_MinusEqual: return BO_SubAssign; 1192 case OO_StarEqual: return BO_MulAssign; 1193 case OO_SlashEqual: return BO_DivAssign; 1194 case OO_PercentEqual: return BO_RemAssign; 1195 case OO_CaretEqual: return BO_XorAssign; 1196 case OO_AmpEqual: return BO_AndAssign; 1197 case OO_PipeEqual: return BO_OrAssign; 1198 case OO_LessLess: return BO_Shl; 1199 case OO_GreaterGreater: return BO_Shr; 1200 case OO_LessLessEqual: return BO_ShlAssign; 1201 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1202 case OO_EqualEqual: return BO_EQ; 1203 case OO_ExclaimEqual: return BO_NE; 1204 case OO_LessEqual: return BO_LE; 1205 case OO_GreaterEqual: return BO_GE; 1206 case OO_AmpAmp: return BO_LAnd; 1207 case OO_PipePipe: return BO_LOr; 1208 case OO_Comma: return BO_Comma; 1209 case OO_ArrowStar: return BO_PtrMemI; 1210 } 1211} 1212 1213OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1214 static const OverloadedOperatorKind OverOps[] = { 1215 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1216 OO_Star, OO_Slash, OO_Percent, 1217 OO_Plus, OO_Minus, 1218 OO_LessLess, OO_GreaterGreater, 1219 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1220 OO_EqualEqual, OO_ExclaimEqual, 1221 OO_Amp, 1222 OO_Caret, 1223 OO_Pipe, 1224 OO_AmpAmp, 1225 OO_PipePipe, 1226 OO_Equal, OO_StarEqual, 1227 OO_SlashEqual, OO_PercentEqual, 1228 OO_PlusEqual, OO_MinusEqual, 1229 OO_LessLessEqual, OO_GreaterGreaterEqual, 1230 OO_AmpEqual, OO_CaretEqual, 1231 OO_PipeEqual, 1232 OO_Comma 1233 }; 1234 return OverOps[Opc]; 1235} 1236 1237InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1238 Expr **initExprs, unsigned numInits, 1239 SourceLocation rbraceloc) 1240 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1241 false), 1242 InitExprs(C, numInits), 1243 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1244 UnionFieldInit(0), HadArrayRangeDesignator(false) 1245{ 1246 for (unsigned I = 0; I != numInits; ++I) { 1247 if (initExprs[I]->isTypeDependent()) 1248 ExprBits.TypeDependent = true; 1249 if (initExprs[I]->isValueDependent()) 1250 ExprBits.ValueDependent = true; 1251 if (initExprs[I]->containsUnexpandedParameterPack()) 1252 ExprBits.ContainsUnexpandedParameterPack = true; 1253 } 1254 1255 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1256} 1257 1258void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1259 if (NumInits > InitExprs.size()) 1260 InitExprs.reserve(C, NumInits); 1261} 1262 1263void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1264 InitExprs.resize(C, NumInits, 0); 1265} 1266 1267Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1268 if (Init >= InitExprs.size()) { 1269 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1270 InitExprs.back() = expr; 1271 return 0; 1272 } 1273 1274 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1275 InitExprs[Init] = expr; 1276 return Result; 1277} 1278 1279SourceRange InitListExpr::getSourceRange() const { 1280 if (SyntacticForm) 1281 return SyntacticForm->getSourceRange(); 1282 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1283 if (Beg.isInvalid()) { 1284 // Find the first non-null initializer. 1285 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1286 E = InitExprs.end(); 1287 I != E; ++I) { 1288 if (Stmt *S = *I) { 1289 Beg = S->getLocStart(); 1290 break; 1291 } 1292 } 1293 } 1294 if (End.isInvalid()) { 1295 // Find the first non-null initializer from the end. 1296 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1297 E = InitExprs.rend(); 1298 I != E; ++I) { 1299 if (Stmt *S = *I) { 1300 End = S->getSourceRange().getEnd(); 1301 break; 1302 } 1303 } 1304 } 1305 return SourceRange(Beg, End); 1306} 1307 1308/// getFunctionType - Return the underlying function type for this block. 1309/// 1310const FunctionType *BlockExpr::getFunctionType() const { 1311 return getType()->getAs<BlockPointerType>()-> 1312 getPointeeType()->getAs<FunctionType>(); 1313} 1314 1315SourceLocation BlockExpr::getCaretLocation() const { 1316 return TheBlock->getCaretLocation(); 1317} 1318const Stmt *BlockExpr::getBody() const { 1319 return TheBlock->getBody(); 1320} 1321Stmt *BlockExpr::getBody() { 1322 return TheBlock->getBody(); 1323} 1324 1325 1326//===----------------------------------------------------------------------===// 1327// Generic Expression Routines 1328//===----------------------------------------------------------------------===// 1329 1330/// isUnusedResultAWarning - Return true if this immediate expression should 1331/// be warned about if the result is unused. If so, fill in Loc and Ranges 1332/// with location to warn on and the source range[s] to report with the 1333/// warning. 1334bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1335 SourceRange &R2, ASTContext &Ctx) const { 1336 // Don't warn if the expr is type dependent. The type could end up 1337 // instantiating to void. 1338 if (isTypeDependent()) 1339 return false; 1340 1341 switch (getStmtClass()) { 1342 default: 1343 if (getType()->isVoidType()) 1344 return false; 1345 Loc = getExprLoc(); 1346 R1 = getSourceRange(); 1347 return true; 1348 case ParenExprClass: 1349 return cast<ParenExpr>(this)->getSubExpr()-> 1350 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1351 case UnaryOperatorClass: { 1352 const UnaryOperator *UO = cast<UnaryOperator>(this); 1353 1354 switch (UO->getOpcode()) { 1355 default: break; 1356 case UO_PostInc: 1357 case UO_PostDec: 1358 case UO_PreInc: 1359 case UO_PreDec: // ++/-- 1360 return false; // Not a warning. 1361 case UO_Deref: 1362 // Dereferencing a volatile pointer is a side-effect. 1363 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1364 return false; 1365 break; 1366 case UO_Real: 1367 case UO_Imag: 1368 // accessing a piece of a volatile complex is a side-effect. 1369 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1370 .isVolatileQualified()) 1371 return false; 1372 break; 1373 case UO_Extension: 1374 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1375 } 1376 Loc = UO->getOperatorLoc(); 1377 R1 = UO->getSubExpr()->getSourceRange(); 1378 return true; 1379 } 1380 case BinaryOperatorClass: { 1381 const BinaryOperator *BO = cast<BinaryOperator>(this); 1382 switch (BO->getOpcode()) { 1383 default: 1384 break; 1385 // Consider the RHS of comma for side effects. LHS was checked by 1386 // Sema::CheckCommaOperands. 1387 case BO_Comma: 1388 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1389 // lvalue-ness) of an assignment written in a macro. 1390 if (IntegerLiteral *IE = 1391 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1392 if (IE->getValue() == 0) 1393 return false; 1394 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1395 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1396 case BO_LAnd: 1397 case BO_LOr: 1398 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1399 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1400 return false; 1401 break; 1402 } 1403 if (BO->isAssignmentOp()) 1404 return false; 1405 Loc = BO->getOperatorLoc(); 1406 R1 = BO->getLHS()->getSourceRange(); 1407 R2 = BO->getRHS()->getSourceRange(); 1408 return true; 1409 } 1410 case CompoundAssignOperatorClass: 1411 case VAArgExprClass: 1412 return false; 1413 1414 case ConditionalOperatorClass: { 1415 // The condition must be evaluated, but if either the LHS or RHS is a 1416 // warning, warn about them. 1417 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1418 if (Exp->getLHS() && 1419 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1420 return true; 1421 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1422 } 1423 1424 case MemberExprClass: 1425 // If the base pointer or element is to a volatile pointer/field, accessing 1426 // it is a side effect. 1427 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1428 return false; 1429 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1430 R1 = SourceRange(Loc, Loc); 1431 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1432 return true; 1433 1434 case ArraySubscriptExprClass: 1435 // If the base pointer or element is to a volatile pointer/field, accessing 1436 // it is a side effect. 1437 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1438 return false; 1439 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1440 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1441 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1442 return true; 1443 1444 case CallExprClass: 1445 case CXXOperatorCallExprClass: 1446 case CXXMemberCallExprClass: { 1447 // If this is a direct call, get the callee. 1448 const CallExpr *CE = cast<CallExpr>(this); 1449 if (const Decl *FD = CE->getCalleeDecl()) { 1450 // If the callee has attribute pure, const, or warn_unused_result, warn 1451 // about it. void foo() { strlen("bar"); } should warn. 1452 // 1453 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1454 // updated to match for QoI. 1455 if (FD->getAttr<WarnUnusedResultAttr>() || 1456 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1457 Loc = CE->getCallee()->getLocStart(); 1458 R1 = CE->getCallee()->getSourceRange(); 1459 1460 if (unsigned NumArgs = CE->getNumArgs()) 1461 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1462 CE->getArg(NumArgs-1)->getLocEnd()); 1463 return true; 1464 } 1465 } 1466 return false; 1467 } 1468 1469 case CXXTemporaryObjectExprClass: 1470 case CXXConstructExprClass: 1471 return false; 1472 1473 case ObjCMessageExprClass: { 1474 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1475 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1476 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1477 Loc = getExprLoc(); 1478 return true; 1479 } 1480 return false; 1481 } 1482 1483 case ObjCPropertyRefExprClass: 1484 Loc = getExprLoc(); 1485 R1 = getSourceRange(); 1486 return true; 1487 1488 case StmtExprClass: { 1489 // Statement exprs don't logically have side effects themselves, but are 1490 // sometimes used in macros in ways that give them a type that is unused. 1491 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1492 // however, if the result of the stmt expr is dead, we don't want to emit a 1493 // warning. 1494 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1495 if (!CS->body_empty()) { 1496 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1497 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1498 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1499 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1500 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1501 } 1502 1503 if (getType()->isVoidType()) 1504 return false; 1505 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1506 R1 = getSourceRange(); 1507 return true; 1508 } 1509 case CStyleCastExprClass: 1510 // If this is an explicit cast to void, allow it. People do this when they 1511 // think they know what they're doing :). 1512 if (getType()->isVoidType()) 1513 return false; 1514 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1515 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1516 return true; 1517 case CXXFunctionalCastExprClass: { 1518 if (getType()->isVoidType()) 1519 return false; 1520 const CastExpr *CE = cast<CastExpr>(this); 1521 1522 // If this is a cast to void or a constructor conversion, check the operand. 1523 // Otherwise, the result of the cast is unused. 1524 if (CE->getCastKind() == CK_ToVoid || 1525 CE->getCastKind() == CK_ConstructorConversion) 1526 return (cast<CastExpr>(this)->getSubExpr() 1527 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1528 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1529 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1530 return true; 1531 } 1532 1533 case ImplicitCastExprClass: 1534 // Check the operand, since implicit casts are inserted by Sema 1535 return (cast<ImplicitCastExpr>(this) 1536 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1537 1538 case CXXDefaultArgExprClass: 1539 return (cast<CXXDefaultArgExpr>(this) 1540 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1541 1542 case CXXNewExprClass: 1543 // FIXME: In theory, there might be new expressions that don't have side 1544 // effects (e.g. a placement new with an uninitialized POD). 1545 case CXXDeleteExprClass: 1546 return false; 1547 case CXXBindTemporaryExprClass: 1548 return (cast<CXXBindTemporaryExpr>(this) 1549 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1550 case ExprWithCleanupsClass: 1551 return (cast<ExprWithCleanups>(this) 1552 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1553 } 1554} 1555 1556/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1557/// returns true, if it is; false otherwise. 1558bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1559 switch (getStmtClass()) { 1560 default: 1561 return false; 1562 case ObjCIvarRefExprClass: 1563 return true; 1564 case Expr::UnaryOperatorClass: 1565 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1566 case ParenExprClass: 1567 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1568 case ImplicitCastExprClass: 1569 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1570 case CStyleCastExprClass: 1571 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1572 case DeclRefExprClass: { 1573 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1574 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1575 if (VD->hasGlobalStorage()) 1576 return true; 1577 QualType T = VD->getType(); 1578 // dereferencing to a pointer is always a gc'able candidate, 1579 // unless it is __weak. 1580 return T->isPointerType() && 1581 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1582 } 1583 return false; 1584 } 1585 case MemberExprClass: { 1586 const MemberExpr *M = cast<MemberExpr>(this); 1587 return M->getBase()->isOBJCGCCandidate(Ctx); 1588 } 1589 case ArraySubscriptExprClass: 1590 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1591 } 1592} 1593 1594bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1595 if (isTypeDependent()) 1596 return false; 1597 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1598} 1599 1600static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1601 Expr::CanThrowResult CT2) { 1602 // CanThrowResult constants are ordered so that the maximum is the correct 1603 // merge result. 1604 return CT1 > CT2 ? CT1 : CT2; 1605} 1606 1607static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1608 Expr *E = const_cast<Expr*>(CE); 1609 Expr::CanThrowResult R = Expr::CT_Cannot; 1610 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1611 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1612 } 1613 return R; 1614} 1615 1616static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1617 bool NullThrows = true) { 1618 if (!D) 1619 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1620 1621 // See if we can get a function type from the decl somehow. 1622 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1623 if (!VD) // If we have no clue what we're calling, assume the worst. 1624 return Expr::CT_Can; 1625 1626 // As an extension, we assume that __attribute__((nothrow)) functions don't 1627 // throw. 1628 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1629 return Expr::CT_Cannot; 1630 1631 QualType T = VD->getType(); 1632 const FunctionProtoType *FT; 1633 if ((FT = T->getAs<FunctionProtoType>())) { 1634 } else if (const PointerType *PT = T->getAs<PointerType>()) 1635 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1636 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1637 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1638 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1639 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1640 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1641 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1642 1643 if (!FT) 1644 return Expr::CT_Can; 1645 1646 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1647} 1648 1649static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1650 if (DC->isTypeDependent()) 1651 return Expr::CT_Dependent; 1652 1653 if (!DC->getTypeAsWritten()->isReferenceType()) 1654 return Expr::CT_Cannot; 1655 1656 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1657} 1658 1659static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1660 const CXXTypeidExpr *DC) { 1661 if (DC->isTypeOperand()) 1662 return Expr::CT_Cannot; 1663 1664 Expr *Op = DC->getExprOperand(); 1665 if (Op->isTypeDependent()) 1666 return Expr::CT_Dependent; 1667 1668 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1669 if (!RT) 1670 return Expr::CT_Cannot; 1671 1672 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1673 return Expr::CT_Cannot; 1674 1675 if (Op->Classify(C).isPRValue()) 1676 return Expr::CT_Cannot; 1677 1678 return Expr::CT_Can; 1679} 1680 1681Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1682 // C++ [expr.unary.noexcept]p3: 1683 // [Can throw] if in a potentially-evaluated context the expression would 1684 // contain: 1685 switch (getStmtClass()) { 1686 case CXXThrowExprClass: 1687 // - a potentially evaluated throw-expression 1688 return CT_Can; 1689 1690 case CXXDynamicCastExprClass: { 1691 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1692 // where T is a reference type, that requires a run-time check 1693 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1694 if (CT == CT_Can) 1695 return CT; 1696 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1697 } 1698 1699 case CXXTypeidExprClass: 1700 // - a potentially evaluated typeid expression applied to a glvalue 1701 // expression whose type is a polymorphic class type 1702 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1703 1704 // - a potentially evaluated call to a function, member function, function 1705 // pointer, or member function pointer that does not have a non-throwing 1706 // exception-specification 1707 case CallExprClass: 1708 case CXXOperatorCallExprClass: 1709 case CXXMemberCallExprClass: { 1710 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1711 if (CT == CT_Can) 1712 return CT; 1713 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1714 } 1715 1716 case CXXConstructExprClass: 1717 case CXXTemporaryObjectExprClass: { 1718 CanThrowResult CT = CanCalleeThrow( 1719 cast<CXXConstructExpr>(this)->getConstructor()); 1720 if (CT == CT_Can) 1721 return CT; 1722 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1723 } 1724 1725 case CXXNewExprClass: { 1726 CanThrowResult CT = MergeCanThrow( 1727 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1728 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1729 /*NullThrows*/false)); 1730 if (CT == CT_Can) 1731 return CT; 1732 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1733 } 1734 1735 case CXXDeleteExprClass: { 1736 CanThrowResult CT = CanCalleeThrow( 1737 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1738 if (CT == CT_Can) 1739 return CT; 1740 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1741 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1742 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1743 Arg = Cast->getSubExpr(); 1744 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1745 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1746 CanThrowResult CT2 = CanCalleeThrow( 1747 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1748 if (CT2 == CT_Can) 1749 return CT2; 1750 CT = MergeCanThrow(CT, CT2); 1751 } 1752 } 1753 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1754 } 1755 1756 case CXXBindTemporaryExprClass: { 1757 // The bound temporary has to be destroyed again, which might throw. 1758 CanThrowResult CT = CanCalleeThrow( 1759 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1760 if (CT == CT_Can) 1761 return CT; 1762 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1763 } 1764 1765 // ObjC message sends are like function calls, but never have exception 1766 // specs. 1767 case ObjCMessageExprClass: 1768 case ObjCPropertyRefExprClass: 1769 return CT_Can; 1770 1771 // Many other things have subexpressions, so we have to test those. 1772 // Some are simple: 1773 case ParenExprClass: 1774 case MemberExprClass: 1775 case CXXReinterpretCastExprClass: 1776 case CXXConstCastExprClass: 1777 case ConditionalOperatorClass: 1778 case CompoundLiteralExprClass: 1779 case ExtVectorElementExprClass: 1780 case InitListExprClass: 1781 case DesignatedInitExprClass: 1782 case ParenListExprClass: 1783 case VAArgExprClass: 1784 case CXXDefaultArgExprClass: 1785 case ExprWithCleanupsClass: 1786 case ObjCIvarRefExprClass: 1787 case ObjCIsaExprClass: 1788 case ShuffleVectorExprClass: 1789 return CanSubExprsThrow(C, this); 1790 1791 // Some might be dependent for other reasons. 1792 case UnaryOperatorClass: 1793 case ArraySubscriptExprClass: 1794 case ImplicitCastExprClass: 1795 case CStyleCastExprClass: 1796 case CXXStaticCastExprClass: 1797 case CXXFunctionalCastExprClass: 1798 case BinaryOperatorClass: 1799 case CompoundAssignOperatorClass: { 1800 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1801 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1802 } 1803 1804 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1805 case StmtExprClass: 1806 return CT_Can; 1807 1808 case ChooseExprClass: 1809 if (isTypeDependent() || isValueDependent()) 1810 return CT_Dependent; 1811 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1812 1813 // Some expressions are always dependent. 1814 case DependentScopeDeclRefExprClass: 1815 case CXXUnresolvedConstructExprClass: 1816 case CXXDependentScopeMemberExprClass: 1817 return CT_Dependent; 1818 1819 default: 1820 // All other expressions don't have subexpressions, or else they are 1821 // unevaluated. 1822 return CT_Cannot; 1823 } 1824} 1825 1826Expr* Expr::IgnoreParens() { 1827 Expr* E = this; 1828 while (true) { 1829 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1830 E = P->getSubExpr(); 1831 continue; 1832 } 1833 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1834 if (P->getOpcode() == UO_Extension) { 1835 E = P->getSubExpr(); 1836 continue; 1837 } 1838 } 1839 return E; 1840 } 1841} 1842 1843/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1844/// or CastExprs or ImplicitCastExprs, returning their operand. 1845Expr *Expr::IgnoreParenCasts() { 1846 Expr *E = this; 1847 while (true) { 1848 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1849 E = P->getSubExpr(); 1850 continue; 1851 } 1852 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1853 E = P->getSubExpr(); 1854 continue; 1855 } 1856 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1857 if (P->getOpcode() == UO_Extension) { 1858 E = P->getSubExpr(); 1859 continue; 1860 } 1861 } 1862 return E; 1863 } 1864} 1865 1866/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1867/// casts. This is intended purely as a temporary workaround for code 1868/// that hasn't yet been rewritten to do the right thing about those 1869/// casts, and may disappear along with the last internal use. 1870Expr *Expr::IgnoreParenLValueCasts() { 1871 Expr *E = this; 1872 while (true) { 1873 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1874 E = P->getSubExpr(); 1875 continue; 1876 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1877 if (P->getCastKind() == CK_LValueToRValue) { 1878 E = P->getSubExpr(); 1879 continue; 1880 } 1881 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1882 if (P->getOpcode() == UO_Extension) { 1883 E = P->getSubExpr(); 1884 continue; 1885 } 1886 } 1887 break; 1888 } 1889 return E; 1890} 1891 1892Expr *Expr::IgnoreParenImpCasts() { 1893 Expr *E = this; 1894 while (true) { 1895 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1896 E = P->getSubExpr(); 1897 continue; 1898 } 1899 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1900 E = P->getSubExpr(); 1901 continue; 1902 } 1903 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1904 if (P->getOpcode() == UO_Extension) { 1905 E = P->getSubExpr(); 1906 continue; 1907 } 1908 } 1909 return E; 1910 } 1911} 1912 1913/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1914/// value (including ptr->int casts of the same size). Strip off any 1915/// ParenExpr or CastExprs, returning their operand. 1916Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1917 Expr *E = this; 1918 while (true) { 1919 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1920 E = P->getSubExpr(); 1921 continue; 1922 } 1923 1924 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1925 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1926 // ptr<->int casts of the same width. We also ignore all identity casts. 1927 Expr *SE = P->getSubExpr(); 1928 1929 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1930 E = SE; 1931 continue; 1932 } 1933 1934 if ((E->getType()->isPointerType() || 1935 E->getType()->isIntegralType(Ctx)) && 1936 (SE->getType()->isPointerType() || 1937 SE->getType()->isIntegralType(Ctx)) && 1938 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1939 E = SE; 1940 continue; 1941 } 1942 } 1943 1944 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1945 if (P->getOpcode() == UO_Extension) { 1946 E = P->getSubExpr(); 1947 continue; 1948 } 1949 } 1950 1951 return E; 1952 } 1953} 1954 1955bool Expr::isDefaultArgument() const { 1956 const Expr *E = this; 1957 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1958 E = ICE->getSubExprAsWritten(); 1959 1960 return isa<CXXDefaultArgExpr>(E); 1961} 1962 1963/// \brief Skip over any no-op casts and any temporary-binding 1964/// expressions. 1965static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1966 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1967 if (ICE->getCastKind() == CK_NoOp) 1968 E = ICE->getSubExpr(); 1969 else 1970 break; 1971 } 1972 1973 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1974 E = BE->getSubExpr(); 1975 1976 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1977 if (ICE->getCastKind() == CK_NoOp) 1978 E = ICE->getSubExpr(); 1979 else 1980 break; 1981 } 1982 1983 return E->IgnoreParens(); 1984} 1985 1986/// isTemporaryObject - Determines if this expression produces a 1987/// temporary of the given class type. 1988bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1989 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1990 return false; 1991 1992 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1993 1994 // Temporaries are by definition pr-values of class type. 1995 if (!E->Classify(C).isPRValue()) { 1996 // In this context, property reference is a message call and is pr-value. 1997 if (!isa<ObjCPropertyRefExpr>(E)) 1998 return false; 1999 } 2000 2001 // Black-list a few cases which yield pr-values of class type that don't 2002 // refer to temporaries of that type: 2003 2004 // - implicit derived-to-base conversions 2005 if (isa<ImplicitCastExpr>(E)) { 2006 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2007 case CK_DerivedToBase: 2008 case CK_UncheckedDerivedToBase: 2009 return false; 2010 default: 2011 break; 2012 } 2013 } 2014 2015 // - member expressions (all) 2016 if (isa<MemberExpr>(E)) 2017 return false; 2018 2019 // - opaque values (all) 2020 if (isa<OpaqueValueExpr>(E)) 2021 return false; 2022 2023 return true; 2024} 2025 2026/// hasAnyTypeDependentArguments - Determines if any of the expressions 2027/// in Exprs is type-dependent. 2028bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 2029 for (unsigned I = 0; I < NumExprs; ++I) 2030 if (Exprs[I]->isTypeDependent()) 2031 return true; 2032 2033 return false; 2034} 2035 2036/// hasAnyValueDependentArguments - Determines if any of the expressions 2037/// in Exprs is value-dependent. 2038bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 2039 for (unsigned I = 0; I < NumExprs; ++I) 2040 if (Exprs[I]->isValueDependent()) 2041 return true; 2042 2043 return false; 2044} 2045 2046bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2047 // This function is attempting whether an expression is an initializer 2048 // which can be evaluated at compile-time. isEvaluatable handles most 2049 // of the cases, but it can't deal with some initializer-specific 2050 // expressions, and it can't deal with aggregates; we deal with those here, 2051 // and fall back to isEvaluatable for the other cases. 2052 2053 // If we ever capture reference-binding directly in the AST, we can 2054 // kill the second parameter. 2055 2056 if (IsForRef) { 2057 EvalResult Result; 2058 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2059 } 2060 2061 switch (getStmtClass()) { 2062 default: break; 2063 case StringLiteralClass: 2064 case ObjCStringLiteralClass: 2065 case ObjCEncodeExprClass: 2066 return true; 2067 case CXXTemporaryObjectExprClass: 2068 case CXXConstructExprClass: { 2069 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2070 2071 // Only if it's 2072 // 1) an application of the trivial default constructor or 2073 if (!CE->getConstructor()->isTrivial()) return false; 2074 if (!CE->getNumArgs()) return true; 2075 2076 // 2) an elidable trivial copy construction of an operand which is 2077 // itself a constant initializer. Note that we consider the 2078 // operand on its own, *not* as a reference binding. 2079 return CE->isElidable() && 2080 CE->getArg(0)->isConstantInitializer(Ctx, false); 2081 } 2082 case CompoundLiteralExprClass: { 2083 // This handles gcc's extension that allows global initializers like 2084 // "struct x {int x;} x = (struct x) {};". 2085 // FIXME: This accepts other cases it shouldn't! 2086 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2087 return Exp->isConstantInitializer(Ctx, false); 2088 } 2089 case InitListExprClass: { 2090 // FIXME: This doesn't deal with fields with reference types correctly. 2091 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2092 // to bitfields. 2093 const InitListExpr *Exp = cast<InitListExpr>(this); 2094 unsigned numInits = Exp->getNumInits(); 2095 for (unsigned i = 0; i < numInits; i++) { 2096 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2097 return false; 2098 } 2099 return true; 2100 } 2101 case ImplicitValueInitExprClass: 2102 return true; 2103 case ParenExprClass: 2104 return cast<ParenExpr>(this)->getSubExpr() 2105 ->isConstantInitializer(Ctx, IsForRef); 2106 case ChooseExprClass: 2107 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2108 ->isConstantInitializer(Ctx, IsForRef); 2109 case UnaryOperatorClass: { 2110 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2111 if (Exp->getOpcode() == UO_Extension) 2112 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2113 break; 2114 } 2115 case BinaryOperatorClass: { 2116 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2117 // but this handles the common case. 2118 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2119 if (Exp->getOpcode() == BO_Sub && 2120 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2121 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2122 return true; 2123 break; 2124 } 2125 case CXXFunctionalCastExprClass: 2126 case CXXStaticCastExprClass: 2127 case ImplicitCastExprClass: 2128 case CStyleCastExprClass: 2129 // Handle casts with a destination that's a struct or union; this 2130 // deals with both the gcc no-op struct cast extension and the 2131 // cast-to-union extension. 2132 if (getType()->isRecordType()) 2133 return cast<CastExpr>(this)->getSubExpr() 2134 ->isConstantInitializer(Ctx, false); 2135 2136 // Integer->integer casts can be handled here, which is important for 2137 // things like (int)(&&x-&&y). Scary but true. 2138 if (getType()->isIntegerType() && 2139 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2140 return cast<CastExpr>(this)->getSubExpr() 2141 ->isConstantInitializer(Ctx, false); 2142 2143 break; 2144 } 2145 return isEvaluatable(Ctx); 2146} 2147 2148/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2149/// pointer constant or not, as well as the specific kind of constant detected. 2150/// Null pointer constants can be integer constant expressions with the 2151/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2152/// (a GNU extension). 2153Expr::NullPointerConstantKind 2154Expr::isNullPointerConstant(ASTContext &Ctx, 2155 NullPointerConstantValueDependence NPC) const { 2156 if (isValueDependent()) { 2157 switch (NPC) { 2158 case NPC_NeverValueDependent: 2159 assert(false && "Unexpected value dependent expression!"); 2160 // If the unthinkable happens, fall through to the safest alternative. 2161 2162 case NPC_ValueDependentIsNull: 2163 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2164 return NPCK_ZeroInteger; 2165 else 2166 return NPCK_NotNull; 2167 2168 case NPC_ValueDependentIsNotNull: 2169 return NPCK_NotNull; 2170 } 2171 } 2172 2173 // Strip off a cast to void*, if it exists. Except in C++. 2174 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2175 if (!Ctx.getLangOptions().CPlusPlus) { 2176 // Check that it is a cast to void*. 2177 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2178 QualType Pointee = PT->getPointeeType(); 2179 if (!Pointee.hasQualifiers() && 2180 Pointee->isVoidType() && // to void* 2181 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2182 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2183 } 2184 } 2185 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2186 // Ignore the ImplicitCastExpr type entirely. 2187 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2188 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2189 // Accept ((void*)0) as a null pointer constant, as many other 2190 // implementations do. 2191 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2192 } else if (const CXXDefaultArgExpr *DefaultArg 2193 = dyn_cast<CXXDefaultArgExpr>(this)) { 2194 // See through default argument expressions 2195 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2196 } else if (isa<GNUNullExpr>(this)) { 2197 // The GNU __null extension is always a null pointer constant. 2198 return NPCK_GNUNull; 2199 } 2200 2201 // C++0x nullptr_t is always a null pointer constant. 2202 if (getType()->isNullPtrType()) 2203 return NPCK_CXX0X_nullptr; 2204 2205 if (const RecordType *UT = getType()->getAsUnionType()) 2206 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2207 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2208 const Expr *InitExpr = CLE->getInitializer(); 2209 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2210 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2211 } 2212 // This expression must be an integer type. 2213 if (!getType()->isIntegerType() || 2214 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2215 return NPCK_NotNull; 2216 2217 // If we have an integer constant expression, we need to *evaluate* it and 2218 // test for the value 0. 2219 llvm::APSInt Result; 2220 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0; 2221 2222 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull); 2223} 2224 2225/// \brief If this expression is an l-value for an Objective C 2226/// property, find the underlying property reference expression. 2227const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2228 const Expr *E = this; 2229 while (true) { 2230 assert((E->getValueKind() == VK_LValue && 2231 E->getObjectKind() == OK_ObjCProperty) && 2232 "expression is not a property reference"); 2233 E = E->IgnoreParenCasts(); 2234 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2235 if (BO->getOpcode() == BO_Comma) { 2236 E = BO->getRHS(); 2237 continue; 2238 } 2239 } 2240 2241 break; 2242 } 2243 2244 return cast<ObjCPropertyRefExpr>(E); 2245} 2246 2247FieldDecl *Expr::getBitField() { 2248 Expr *E = this->IgnoreParens(); 2249 2250 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2251 if (ICE->getCastKind() == CK_LValueToRValue || 2252 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2253 E = ICE->getSubExpr()->IgnoreParens(); 2254 else 2255 break; 2256 } 2257 2258 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2259 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2260 if (Field->isBitField()) 2261 return Field; 2262 2263 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2264 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2265 if (Field->isBitField()) 2266 return Field; 2267 2268 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2269 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2270 return BinOp->getLHS()->getBitField(); 2271 2272 return 0; 2273} 2274 2275bool Expr::refersToVectorElement() const { 2276 const Expr *E = this->IgnoreParens(); 2277 2278 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2279 if (ICE->getValueKind() != VK_RValue && 2280 ICE->getCastKind() == CK_NoOp) 2281 E = ICE->getSubExpr()->IgnoreParens(); 2282 else 2283 break; 2284 } 2285 2286 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2287 return ASE->getBase()->getType()->isVectorType(); 2288 2289 if (isa<ExtVectorElementExpr>(E)) 2290 return true; 2291 2292 return false; 2293} 2294 2295/// isArrow - Return true if the base expression is a pointer to vector, 2296/// return false if the base expression is a vector. 2297bool ExtVectorElementExpr::isArrow() const { 2298 return getBase()->getType()->isPointerType(); 2299} 2300 2301unsigned ExtVectorElementExpr::getNumElements() const { 2302 if (const VectorType *VT = getType()->getAs<VectorType>()) 2303 return VT->getNumElements(); 2304 return 1; 2305} 2306 2307/// containsDuplicateElements - Return true if any element access is repeated. 2308bool ExtVectorElementExpr::containsDuplicateElements() const { 2309 // FIXME: Refactor this code to an accessor on the AST node which returns the 2310 // "type" of component access, and share with code below and in Sema. 2311 llvm::StringRef Comp = Accessor->getName(); 2312 2313 // Halving swizzles do not contain duplicate elements. 2314 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2315 return false; 2316 2317 // Advance past s-char prefix on hex swizzles. 2318 if (Comp[0] == 's' || Comp[0] == 'S') 2319 Comp = Comp.substr(1); 2320 2321 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2322 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2323 return true; 2324 2325 return false; 2326} 2327 2328/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2329void ExtVectorElementExpr::getEncodedElementAccess( 2330 llvm::SmallVectorImpl<unsigned> &Elts) const { 2331 llvm::StringRef Comp = Accessor->getName(); 2332 if (Comp[0] == 's' || Comp[0] == 'S') 2333 Comp = Comp.substr(1); 2334 2335 bool isHi = Comp == "hi"; 2336 bool isLo = Comp == "lo"; 2337 bool isEven = Comp == "even"; 2338 bool isOdd = Comp == "odd"; 2339 2340 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2341 uint64_t Index; 2342 2343 if (isHi) 2344 Index = e + i; 2345 else if (isLo) 2346 Index = i; 2347 else if (isEven) 2348 Index = 2 * i; 2349 else if (isOdd) 2350 Index = 2 * i + 1; 2351 else 2352 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2353 2354 Elts.push_back(Index); 2355 } 2356} 2357 2358ObjCMessageExpr::ObjCMessageExpr(QualType T, 2359 ExprValueKind VK, 2360 SourceLocation LBracLoc, 2361 SourceLocation SuperLoc, 2362 bool IsInstanceSuper, 2363 QualType SuperType, 2364 Selector Sel, 2365 SourceLocation SelLoc, 2366 ObjCMethodDecl *Method, 2367 Expr **Args, unsigned NumArgs, 2368 SourceLocation RBracLoc) 2369 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2370 /*TypeDependent=*/false, /*ValueDependent=*/false, 2371 /*ContainsUnexpandedParameterPack=*/false), 2372 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2373 HasMethod(Method != 0), SuperLoc(SuperLoc), 2374 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2375 : Sel.getAsOpaquePtr())), 2376 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2377{ 2378 setReceiverPointer(SuperType.getAsOpaquePtr()); 2379 if (NumArgs) 2380 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2381} 2382 2383ObjCMessageExpr::ObjCMessageExpr(QualType T, 2384 ExprValueKind VK, 2385 SourceLocation LBracLoc, 2386 TypeSourceInfo *Receiver, 2387 Selector Sel, 2388 SourceLocation SelLoc, 2389 ObjCMethodDecl *Method, 2390 Expr **Args, unsigned NumArgs, 2391 SourceLocation RBracLoc) 2392 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2393 T->isDependentType(), T->containsUnexpandedParameterPack()), 2394 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2395 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2396 : Sel.getAsOpaquePtr())), 2397 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2398{ 2399 setReceiverPointer(Receiver); 2400 Expr **MyArgs = getArgs(); 2401 for (unsigned I = 0; I != NumArgs; ++I) { 2402 if (Args[I]->isTypeDependent()) 2403 ExprBits.TypeDependent = true; 2404 if (Args[I]->isValueDependent()) 2405 ExprBits.ValueDependent = true; 2406 if (Args[I]->containsUnexpandedParameterPack()) 2407 ExprBits.ContainsUnexpandedParameterPack = true; 2408 2409 MyArgs[I] = Args[I]; 2410 } 2411} 2412 2413ObjCMessageExpr::ObjCMessageExpr(QualType T, 2414 ExprValueKind VK, 2415 SourceLocation LBracLoc, 2416 Expr *Receiver, 2417 Selector Sel, 2418 SourceLocation SelLoc, 2419 ObjCMethodDecl *Method, 2420 Expr **Args, unsigned NumArgs, 2421 SourceLocation RBracLoc) 2422 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2423 Receiver->isTypeDependent(), 2424 Receiver->containsUnexpandedParameterPack()), 2425 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2426 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2427 : Sel.getAsOpaquePtr())), 2428 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2429{ 2430 setReceiverPointer(Receiver); 2431 Expr **MyArgs = getArgs(); 2432 for (unsigned I = 0; I != NumArgs; ++I) { 2433 if (Args[I]->isTypeDependent()) 2434 ExprBits.TypeDependent = true; 2435 if (Args[I]->isValueDependent()) 2436 ExprBits.ValueDependent = true; 2437 if (Args[I]->containsUnexpandedParameterPack()) 2438 ExprBits.ContainsUnexpandedParameterPack = true; 2439 2440 MyArgs[I] = Args[I]; 2441 } 2442} 2443 2444ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2445 ExprValueKind VK, 2446 SourceLocation LBracLoc, 2447 SourceLocation SuperLoc, 2448 bool IsInstanceSuper, 2449 QualType SuperType, 2450 Selector Sel, 2451 SourceLocation SelLoc, 2452 ObjCMethodDecl *Method, 2453 Expr **Args, unsigned NumArgs, 2454 SourceLocation RBracLoc) { 2455 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2456 NumArgs * sizeof(Expr *); 2457 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2458 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2459 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2460 RBracLoc); 2461} 2462 2463ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2464 ExprValueKind VK, 2465 SourceLocation LBracLoc, 2466 TypeSourceInfo *Receiver, 2467 Selector Sel, 2468 SourceLocation SelLoc, 2469 ObjCMethodDecl *Method, 2470 Expr **Args, unsigned NumArgs, 2471 SourceLocation RBracLoc) { 2472 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2473 NumArgs * sizeof(Expr *); 2474 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2475 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2476 Method, Args, NumArgs, RBracLoc); 2477} 2478 2479ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2480 ExprValueKind VK, 2481 SourceLocation LBracLoc, 2482 Expr *Receiver, 2483 Selector Sel, 2484 SourceLocation SelLoc, 2485 ObjCMethodDecl *Method, 2486 Expr **Args, unsigned NumArgs, 2487 SourceLocation RBracLoc) { 2488 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2489 NumArgs * sizeof(Expr *); 2490 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2491 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2492 Method, Args, NumArgs, RBracLoc); 2493} 2494 2495ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2496 unsigned NumArgs) { 2497 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2498 NumArgs * sizeof(Expr *); 2499 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2500 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2501} 2502 2503SourceRange ObjCMessageExpr::getReceiverRange() const { 2504 switch (getReceiverKind()) { 2505 case Instance: 2506 return getInstanceReceiver()->getSourceRange(); 2507 2508 case Class: 2509 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2510 2511 case SuperInstance: 2512 case SuperClass: 2513 return getSuperLoc(); 2514 } 2515 2516 return SourceLocation(); 2517} 2518 2519Selector ObjCMessageExpr::getSelector() const { 2520 if (HasMethod) 2521 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2522 ->getSelector(); 2523 return Selector(SelectorOrMethod); 2524} 2525 2526ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2527 switch (getReceiverKind()) { 2528 case Instance: 2529 if (const ObjCObjectPointerType *Ptr 2530 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2531 return Ptr->getInterfaceDecl(); 2532 break; 2533 2534 case Class: 2535 if (const ObjCObjectType *Ty 2536 = getClassReceiver()->getAs<ObjCObjectType>()) 2537 return Ty->getInterface(); 2538 break; 2539 2540 case SuperInstance: 2541 if (const ObjCObjectPointerType *Ptr 2542 = getSuperType()->getAs<ObjCObjectPointerType>()) 2543 return Ptr->getInterfaceDecl(); 2544 break; 2545 2546 case SuperClass: 2547 if (const ObjCObjectType *Iface 2548 = getSuperType()->getAs<ObjCObjectType>()) 2549 return Iface->getInterface(); 2550 break; 2551 } 2552 2553 return 0; 2554} 2555 2556bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2557 return getCond()->EvaluateAsInt(C) != 0; 2558} 2559 2560ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2561 QualType Type, SourceLocation BLoc, 2562 SourceLocation RP) 2563 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2564 Type->isDependentType(), Type->isDependentType(), 2565 Type->containsUnexpandedParameterPack()), 2566 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2567{ 2568 SubExprs = new (C) Stmt*[nexpr]; 2569 for (unsigned i = 0; i < nexpr; i++) { 2570 if (args[i]->isTypeDependent()) 2571 ExprBits.TypeDependent = true; 2572 if (args[i]->isValueDependent()) 2573 ExprBits.ValueDependent = true; 2574 if (args[i]->containsUnexpandedParameterPack()) 2575 ExprBits.ContainsUnexpandedParameterPack = true; 2576 2577 SubExprs[i] = args[i]; 2578 } 2579} 2580 2581void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2582 unsigned NumExprs) { 2583 if (SubExprs) C.Deallocate(SubExprs); 2584 2585 SubExprs = new (C) Stmt* [NumExprs]; 2586 this->NumExprs = NumExprs; 2587 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2588} 2589 2590//===----------------------------------------------------------------------===// 2591// DesignatedInitExpr 2592//===----------------------------------------------------------------------===// 2593 2594IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2595 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2596 if (Field.NameOrField & 0x01) 2597 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2598 else 2599 return getField()->getIdentifier(); 2600} 2601 2602DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2603 unsigned NumDesignators, 2604 const Designator *Designators, 2605 SourceLocation EqualOrColonLoc, 2606 bool GNUSyntax, 2607 Expr **IndexExprs, 2608 unsigned NumIndexExprs, 2609 Expr *Init) 2610 : Expr(DesignatedInitExprClass, Ty, 2611 Init->getValueKind(), Init->getObjectKind(), 2612 Init->isTypeDependent(), Init->isValueDependent(), 2613 Init->containsUnexpandedParameterPack()), 2614 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2615 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2616 this->Designators = new (C) Designator[NumDesignators]; 2617 2618 // Record the initializer itself. 2619 child_range Child = children(); 2620 *Child++ = Init; 2621 2622 // Copy the designators and their subexpressions, computing 2623 // value-dependence along the way. 2624 unsigned IndexIdx = 0; 2625 for (unsigned I = 0; I != NumDesignators; ++I) { 2626 this->Designators[I] = Designators[I]; 2627 2628 if (this->Designators[I].isArrayDesignator()) { 2629 // Compute type- and value-dependence. 2630 Expr *Index = IndexExprs[IndexIdx]; 2631 if (Index->isTypeDependent() || Index->isValueDependent()) 2632 ExprBits.ValueDependent = true; 2633 2634 // Propagate unexpanded parameter packs. 2635 if (Index->containsUnexpandedParameterPack()) 2636 ExprBits.ContainsUnexpandedParameterPack = true; 2637 2638 // Copy the index expressions into permanent storage. 2639 *Child++ = IndexExprs[IndexIdx++]; 2640 } else if (this->Designators[I].isArrayRangeDesignator()) { 2641 // Compute type- and value-dependence. 2642 Expr *Start = IndexExprs[IndexIdx]; 2643 Expr *End = IndexExprs[IndexIdx + 1]; 2644 if (Start->isTypeDependent() || Start->isValueDependent() || 2645 End->isTypeDependent() || End->isValueDependent()) 2646 ExprBits.ValueDependent = true; 2647 2648 // Propagate unexpanded parameter packs. 2649 if (Start->containsUnexpandedParameterPack() || 2650 End->containsUnexpandedParameterPack()) 2651 ExprBits.ContainsUnexpandedParameterPack = true; 2652 2653 // Copy the start/end expressions into permanent storage. 2654 *Child++ = IndexExprs[IndexIdx++]; 2655 *Child++ = IndexExprs[IndexIdx++]; 2656 } 2657 } 2658 2659 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2660} 2661 2662DesignatedInitExpr * 2663DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2664 unsigned NumDesignators, 2665 Expr **IndexExprs, unsigned NumIndexExprs, 2666 SourceLocation ColonOrEqualLoc, 2667 bool UsesColonSyntax, Expr *Init) { 2668 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2669 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2670 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2671 ColonOrEqualLoc, UsesColonSyntax, 2672 IndexExprs, NumIndexExprs, Init); 2673} 2674 2675DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2676 unsigned NumIndexExprs) { 2677 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2678 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2679 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2680} 2681 2682void DesignatedInitExpr::setDesignators(ASTContext &C, 2683 const Designator *Desigs, 2684 unsigned NumDesigs) { 2685 Designators = new (C) Designator[NumDesigs]; 2686 NumDesignators = NumDesigs; 2687 for (unsigned I = 0; I != NumDesigs; ++I) 2688 Designators[I] = Desigs[I]; 2689} 2690 2691SourceRange DesignatedInitExpr::getSourceRange() const { 2692 SourceLocation StartLoc; 2693 Designator &First = 2694 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2695 if (First.isFieldDesignator()) { 2696 if (GNUSyntax) 2697 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2698 else 2699 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2700 } else 2701 StartLoc = 2702 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2703 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2704} 2705 2706Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2707 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2708 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2709 Ptr += sizeof(DesignatedInitExpr); 2710 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2711 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2712} 2713 2714Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2715 assert(D.Kind == Designator::ArrayRangeDesignator && 2716 "Requires array range designator"); 2717 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2718 Ptr += sizeof(DesignatedInitExpr); 2719 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2720 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2721} 2722 2723Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2724 assert(D.Kind == Designator::ArrayRangeDesignator && 2725 "Requires array range designator"); 2726 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2727 Ptr += sizeof(DesignatedInitExpr); 2728 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2729 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2730} 2731 2732/// \brief Replaces the designator at index @p Idx with the series 2733/// of designators in [First, Last). 2734void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2735 const Designator *First, 2736 const Designator *Last) { 2737 unsigned NumNewDesignators = Last - First; 2738 if (NumNewDesignators == 0) { 2739 std::copy_backward(Designators + Idx + 1, 2740 Designators + NumDesignators, 2741 Designators + Idx); 2742 --NumNewDesignators; 2743 return; 2744 } else if (NumNewDesignators == 1) { 2745 Designators[Idx] = *First; 2746 return; 2747 } 2748 2749 Designator *NewDesignators 2750 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2751 std::copy(Designators, Designators + Idx, NewDesignators); 2752 std::copy(First, Last, NewDesignators + Idx); 2753 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2754 NewDesignators + Idx + NumNewDesignators); 2755 Designators = NewDesignators; 2756 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2757} 2758 2759ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2760 Expr **exprs, unsigned nexprs, 2761 SourceLocation rparenloc) 2762 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2763 false, false, false), 2764 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2765 2766 Exprs = new (C) Stmt*[nexprs]; 2767 for (unsigned i = 0; i != nexprs; ++i) { 2768 if (exprs[i]->isTypeDependent()) 2769 ExprBits.TypeDependent = true; 2770 if (exprs[i]->isValueDependent()) 2771 ExprBits.ValueDependent = true; 2772 if (exprs[i]->containsUnexpandedParameterPack()) 2773 ExprBits.ContainsUnexpandedParameterPack = true; 2774 2775 Exprs[i] = exprs[i]; 2776 } 2777} 2778 2779const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 2780 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 2781 e = ewc->getSubExpr(); 2782 e = cast<CXXConstructExpr>(e)->getArg(0); 2783 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2784 e = ice->getSubExpr(); 2785 return cast<OpaqueValueExpr>(e); 2786} 2787 2788//===----------------------------------------------------------------------===// 2789// ExprIterator. 2790//===----------------------------------------------------------------------===// 2791 2792Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2793Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2794Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2795const Expr* ConstExprIterator::operator[](size_t idx) const { 2796 return cast<Expr>(I[idx]); 2797} 2798const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2799const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2800 2801//===----------------------------------------------------------------------===// 2802// Child Iterators for iterating over subexpressions/substatements 2803//===----------------------------------------------------------------------===// 2804 2805// SizeOfAlignOfExpr 2806Stmt::child_range SizeOfAlignOfExpr::children() { 2807 // If this is of a type and the type is a VLA type (and not a typedef), the 2808 // size expression of the VLA needs to be treated as an executable expression. 2809 // Why isn't this weirdness documented better in StmtIterator? 2810 if (isArgumentType()) { 2811 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 2812 getArgumentType().getTypePtr())) 2813 return child_range(child_iterator(T), child_iterator()); 2814 return child_range(); 2815 } 2816 return child_range(&Argument.Ex, &Argument.Ex + 1); 2817} 2818 2819// ObjCMessageExpr 2820Stmt::child_range ObjCMessageExpr::children() { 2821 Stmt **begin; 2822 if (getReceiverKind() == Instance) 2823 begin = reinterpret_cast<Stmt **>(this + 1); 2824 else 2825 begin = reinterpret_cast<Stmt **>(getArgs()); 2826 return child_range(begin, 2827 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 2828} 2829 2830// Blocks 2831BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 2832 SourceLocation l, bool ByRef, 2833 bool constAdded) 2834 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, 2835 d->isParameterPack()), 2836 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 2837{ 2838 bool TypeDependent = false; 2839 bool ValueDependent = false; 2840 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent); 2841 ExprBits.TypeDependent = TypeDependent; 2842 ExprBits.ValueDependent = ValueDependent; 2843} 2844 2845