Expr.cpp revision 33e56f3273457bfa22c7c50bc46cf5a18216863d
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/Sema/SemaDiagnostic.h" 26#include "clang/Basic/Builtins.h" 27#include "clang/Basic/SourceManager.h" 28#include "clang/Basic/TargetInfo.h" 29#include "llvm/Support/ErrorHandling.h" 30#include "llvm/Support/raw_ostream.h" 31#include <algorithm> 32using namespace clang; 33 34/// isKnownToHaveBooleanValue - Return true if this is an integer expression 35/// that is known to return 0 or 1. This happens for _Bool/bool expressions 36/// but also int expressions which are produced by things like comparisons in 37/// C. 38bool Expr::isKnownToHaveBooleanValue() const { 39 const Expr *E = IgnoreParens(); 40 41 // If this value has _Bool type, it is obvious 0/1. 42 if (E->getType()->isBooleanType()) return true; 43 // If this is a non-scalar-integer type, we don't care enough to try. 44 if (!E->getType()->isIntegralOrEnumerationType()) return false; 45 46 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) { 47 switch (UO->getOpcode()) { 48 case UO_Plus: 49 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 50 default: 51 return false; 52 } 53 } 54 55 // Only look through implicit casts. If the user writes 56 // '(int) (a && b)' treat it as an arbitrary int. 57 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E)) 58 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 59 60 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 61 switch (BO->getOpcode()) { 62 default: return false; 63 case BO_LT: // Relational operators. 64 case BO_GT: 65 case BO_LE: 66 case BO_GE: 67 case BO_EQ: // Equality operators. 68 case BO_NE: 69 case BO_LAnd: // AND operator. 70 case BO_LOr: // Logical OR operator. 71 return true; 72 73 case BO_And: // Bitwise AND operator. 74 case BO_Xor: // Bitwise XOR operator. 75 case BO_Or: // Bitwise OR operator. 76 // Handle things like (x==2)|(y==12). 77 return BO->getLHS()->isKnownToHaveBooleanValue() && 78 BO->getRHS()->isKnownToHaveBooleanValue(); 79 80 case BO_Comma: 81 case BO_Assign: 82 return BO->getRHS()->isKnownToHaveBooleanValue(); 83 } 84 } 85 86 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) 87 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 88 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 89 90 return false; 91} 92 93// Amusing macro metaprogramming hack: check whether a class provides 94// a more specific implementation of getExprLoc(). 95namespace { 96 /// This implementation is used when a class provides a custom 97 /// implementation of getExprLoc. 98 template <class E, class T> 99 SourceLocation getExprLocImpl(const Expr *expr, 100 SourceLocation (T::*v)() const) { 101 return static_cast<const E*>(expr)->getExprLoc(); 102 } 103 104 /// This implementation is used when a class doesn't provide 105 /// a custom implementation of getExprLoc. Overload resolution 106 /// should pick it over the implementation above because it's 107 /// more specialized according to function template partial ordering. 108 template <class E> 109 SourceLocation getExprLocImpl(const Expr *expr, 110 SourceLocation (Expr::*v)() const) { 111 return static_cast<const E*>(expr)->getSourceRange().getBegin(); 112 } 113} 114 115SourceLocation Expr::getExprLoc() const { 116 switch (getStmtClass()) { 117 case Stmt::NoStmtClass: llvm_unreachable("statement without class"); 118#define ABSTRACT_STMT(type) 119#define STMT(type, base) \ 120 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break; 121#define EXPR(type, base) \ 122 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc); 123#include "clang/AST/StmtNodes.inc" 124 } 125 llvm_unreachable("unknown statement kind"); 126 return SourceLocation(); 127} 128 129//===----------------------------------------------------------------------===// 130// Primary Expressions. 131//===----------------------------------------------------------------------===// 132 133void ExplicitTemplateArgumentList::initializeFrom( 134 const TemplateArgumentListInfo &Info) { 135 LAngleLoc = Info.getLAngleLoc(); 136 RAngleLoc = Info.getRAngleLoc(); 137 NumTemplateArgs = Info.size(); 138 139 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 140 for (unsigned i = 0; i != NumTemplateArgs; ++i) 141 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 142} 143 144void ExplicitTemplateArgumentList::initializeFrom( 145 const TemplateArgumentListInfo &Info, 146 bool &Dependent, 147 bool &InstantiationDependent, 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 InstantiationDependent = InstantiationDependent || 157 Info[i].getArgument().isInstantiationDependent(); 158 ContainsUnexpandedParameterPack 159 = ContainsUnexpandedParameterPack || 160 Info[i].getArgument().containsUnexpandedParameterPack(); 161 162 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 163 } 164} 165 166void ExplicitTemplateArgumentList::copyInto( 167 TemplateArgumentListInfo &Info) const { 168 Info.setLAngleLoc(LAngleLoc); 169 Info.setRAngleLoc(RAngleLoc); 170 for (unsigned I = 0; I != NumTemplateArgs; ++I) 171 Info.addArgument(getTemplateArgs()[I]); 172} 173 174std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { 175 return sizeof(ExplicitTemplateArgumentList) + 176 sizeof(TemplateArgumentLoc) * NumTemplateArgs; 177} 178 179std::size_t ExplicitTemplateArgumentList::sizeFor( 180 const TemplateArgumentListInfo &Info) { 181 return sizeFor(Info.size()); 182} 183 184/// \brief Compute the type-, value-, and instantiation-dependence of a 185/// declaration reference 186/// based on the declaration being referenced. 187static void computeDeclRefDependence(NamedDecl *D, QualType T, 188 bool &TypeDependent, 189 bool &ValueDependent, 190 bool &InstantiationDependent) { 191 TypeDependent = false; 192 ValueDependent = false; 193 InstantiationDependent = false; 194 195 // (TD) C++ [temp.dep.expr]p3: 196 // An id-expression is type-dependent if it contains: 197 // 198 // and 199 // 200 // (VD) C++ [temp.dep.constexpr]p2: 201 // An identifier is value-dependent if it is: 202 203 // (TD) - an identifier that was declared with dependent type 204 // (VD) - a name declared with a dependent type, 205 if (T->isDependentType()) { 206 TypeDependent = true; 207 ValueDependent = true; 208 InstantiationDependent = true; 209 return; 210 } else if (T->isInstantiationDependentType()) { 211 InstantiationDependent = true; 212 } 213 214 // (TD) - a conversion-function-id that specifies a dependent type 215 if (D->getDeclName().getNameKind() 216 == DeclarationName::CXXConversionFunctionName) { 217 QualType T = D->getDeclName().getCXXNameType(); 218 if (T->isDependentType()) { 219 TypeDependent = true; 220 ValueDependent = true; 221 InstantiationDependent = true; 222 return; 223 } 224 225 if (T->isInstantiationDependentType()) 226 InstantiationDependent = true; 227 } 228 229 // (VD) - the name of a non-type template parameter, 230 if (isa<NonTypeTemplateParmDecl>(D)) { 231 ValueDependent = true; 232 InstantiationDependent = true; 233 return; 234 } 235 236 // (VD) - a constant with integral or enumeration type and is 237 // initialized with an expression that is value-dependent. 238 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 239 if (Var->getType()->isIntegralOrEnumerationType() && 240 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 241 if (const Expr *Init = Var->getAnyInitializer()) 242 if (Init->isValueDependent()) { 243 ValueDependent = true; 244 InstantiationDependent = true; 245 } 246 } 247 248 // (VD) - FIXME: Missing from the standard: 249 // - a member function or a static data member of the current 250 // instantiation 251 else if (Var->isStaticDataMember() && 252 Var->getDeclContext()->isDependentContext()) { 253 ValueDependent = true; 254 InstantiationDependent = true; 255 } 256 257 return; 258 } 259 260 // (VD) - FIXME: Missing from the standard: 261 // - a member function or a static data member of the current 262 // instantiation 263 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) { 264 ValueDependent = true; 265 InstantiationDependent = true; 266 return; 267 } 268} 269 270void DeclRefExpr::computeDependence() { 271 bool TypeDependent = false; 272 bool ValueDependent = false; 273 bool InstantiationDependent = false; 274 computeDeclRefDependence(getDecl(), getType(), TypeDependent, ValueDependent, 275 InstantiationDependent); 276 277 // (TD) C++ [temp.dep.expr]p3: 278 // An id-expression is type-dependent if it contains: 279 // 280 // and 281 // 282 // (VD) C++ [temp.dep.constexpr]p2: 283 // An identifier is value-dependent if it is: 284 if (!TypeDependent && !ValueDependent && 285 hasExplicitTemplateArgs() && 286 TemplateSpecializationType::anyDependentTemplateArguments( 287 getTemplateArgs(), 288 getNumTemplateArgs(), 289 InstantiationDependent)) { 290 TypeDependent = true; 291 ValueDependent = true; 292 InstantiationDependent = true; 293 } 294 295 ExprBits.TypeDependent = TypeDependent; 296 ExprBits.ValueDependent = ValueDependent; 297 ExprBits.InstantiationDependent = InstantiationDependent; 298 299 // Is the declaration a parameter pack? 300 if (getDecl()->isParameterPack()) 301 ExprBits.ContainsUnexpandedParameterPack = true; 302} 303 304DeclRefExpr::DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 305 ValueDecl *D, const DeclarationNameInfo &NameInfo, 306 NamedDecl *FoundD, 307 const TemplateArgumentListInfo *TemplateArgs, 308 QualType T, ExprValueKind VK) 309 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 310 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 311 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0; 312 if (QualifierLoc) 313 getInternalQualifierLoc() = QualifierLoc; 314 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0; 315 if (FoundD) 316 getInternalFoundDecl() = FoundD; 317 DeclRefExprBits.HasExplicitTemplateArgs = TemplateArgs ? 1 : 0; 318 if (TemplateArgs) { 319 bool Dependent = false; 320 bool InstantiationDependent = false; 321 bool ContainsUnexpandedParameterPack = false; 322 getExplicitTemplateArgs().initializeFrom(*TemplateArgs, Dependent, 323 InstantiationDependent, 324 ContainsUnexpandedParameterPack); 325 if (InstantiationDependent) 326 setInstantiationDependent(true); 327 } 328 329 computeDependence(); 330} 331 332DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 333 NestedNameSpecifierLoc QualifierLoc, 334 ValueDecl *D, 335 SourceLocation NameLoc, 336 QualType T, 337 ExprValueKind VK, 338 NamedDecl *FoundD, 339 const TemplateArgumentListInfo *TemplateArgs) { 340 return Create(Context, QualifierLoc, D, 341 DeclarationNameInfo(D->getDeclName(), NameLoc), 342 T, VK, FoundD, TemplateArgs); 343} 344 345DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 346 NestedNameSpecifierLoc QualifierLoc, 347 ValueDecl *D, 348 const DeclarationNameInfo &NameInfo, 349 QualType T, 350 ExprValueKind VK, 351 NamedDecl *FoundD, 352 const TemplateArgumentListInfo *TemplateArgs) { 353 // Filter out cases where the found Decl is the same as the value refenenced. 354 if (D == FoundD) 355 FoundD = 0; 356 357 std::size_t Size = sizeof(DeclRefExpr); 358 if (QualifierLoc != 0) 359 Size += sizeof(NestedNameSpecifierLoc); 360 if (FoundD) 361 Size += sizeof(NamedDecl *); 362 if (TemplateArgs) 363 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 364 365 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 366 return new (Mem) DeclRefExpr(QualifierLoc, D, NameInfo, FoundD, TemplateArgs, 367 T, VK); 368} 369 370DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 371 bool HasQualifier, 372 bool HasFoundDecl, 373 bool HasExplicitTemplateArgs, 374 unsigned NumTemplateArgs) { 375 std::size_t Size = sizeof(DeclRefExpr); 376 if (HasQualifier) 377 Size += sizeof(NestedNameSpecifierLoc); 378 if (HasFoundDecl) 379 Size += sizeof(NamedDecl *); 380 if (HasExplicitTemplateArgs) 381 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 382 383 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 384 return new (Mem) DeclRefExpr(EmptyShell()); 385} 386 387SourceRange DeclRefExpr::getSourceRange() const { 388 SourceRange R = getNameInfo().getSourceRange(); 389 if (hasQualifier()) 390 R.setBegin(getQualifierLoc().getBeginLoc()); 391 if (hasExplicitTemplateArgs()) 392 R.setEnd(getRAngleLoc()); 393 return R; 394} 395 396// FIXME: Maybe this should use DeclPrinter with a special "print predefined 397// expr" policy instead. 398std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 399 ASTContext &Context = CurrentDecl->getASTContext(); 400 401 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 402 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 403 return FD->getNameAsString(); 404 405 llvm::SmallString<256> Name; 406 llvm::raw_svector_ostream Out(Name); 407 408 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 409 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 410 Out << "virtual "; 411 if (MD->isStatic()) 412 Out << "static "; 413 } 414 415 PrintingPolicy Policy(Context.getLangOptions()); 416 417 std::string Proto = FD->getQualifiedNameAsString(Policy); 418 419 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 420 const FunctionProtoType *FT = 0; 421 if (FD->hasWrittenPrototype()) 422 FT = dyn_cast<FunctionProtoType>(AFT); 423 424 Proto += "("; 425 if (FT) { 426 llvm::raw_string_ostream POut(Proto); 427 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 428 if (i) POut << ", "; 429 std::string Param; 430 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 431 POut << Param; 432 } 433 434 if (FT->isVariadic()) { 435 if (FD->getNumParams()) POut << ", "; 436 POut << "..."; 437 } 438 } 439 Proto += ")"; 440 441 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 442 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 443 if (ThisQuals.hasConst()) 444 Proto += " const"; 445 if (ThisQuals.hasVolatile()) 446 Proto += " volatile"; 447 } 448 449 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 450 AFT->getResultType().getAsStringInternal(Proto, Policy); 451 452 Out << Proto; 453 454 Out.flush(); 455 return Name.str().str(); 456 } 457 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 458 llvm::SmallString<256> Name; 459 llvm::raw_svector_ostream Out(Name); 460 Out << (MD->isInstanceMethod() ? '-' : '+'); 461 Out << '['; 462 463 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 464 // a null check to avoid a crash. 465 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 466 Out << ID; 467 468 if (const ObjCCategoryImplDecl *CID = 469 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 470 Out << '(' << CID << ')'; 471 472 Out << ' '; 473 Out << MD->getSelector().getAsString(); 474 Out << ']'; 475 476 Out.flush(); 477 return Name.str().str(); 478 } 479 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 480 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 481 return "top level"; 482 } 483 return ""; 484} 485 486void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 487 if (hasAllocation()) 488 C.Deallocate(pVal); 489 490 BitWidth = Val.getBitWidth(); 491 unsigned NumWords = Val.getNumWords(); 492 const uint64_t* Words = Val.getRawData(); 493 if (NumWords > 1) { 494 pVal = new (C) uint64_t[NumWords]; 495 std::copy(Words, Words + NumWords, pVal); 496 } else if (NumWords == 1) 497 VAL = Words[0]; 498 else 499 VAL = 0; 500} 501 502IntegerLiteral * 503IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 504 QualType type, SourceLocation l) { 505 return new (C) IntegerLiteral(C, V, type, l); 506} 507 508IntegerLiteral * 509IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 510 return new (C) IntegerLiteral(Empty); 511} 512 513FloatingLiteral * 514FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 515 bool isexact, QualType Type, SourceLocation L) { 516 return new (C) FloatingLiteral(C, V, isexact, Type, L); 517} 518 519FloatingLiteral * 520FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 521 return new (C) FloatingLiteral(Empty); 522} 523 524/// getValueAsApproximateDouble - This returns the value as an inaccurate 525/// double. Note that this may cause loss of precision, but is useful for 526/// debugging dumps, etc. 527double FloatingLiteral::getValueAsApproximateDouble() const { 528 llvm::APFloat V = getValue(); 529 bool ignored; 530 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 531 &ignored); 532 return V.convertToDouble(); 533} 534 535StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str, 536 StringKind Kind, bool Pascal, QualType Ty, 537 const SourceLocation *Loc, 538 unsigned NumStrs) { 539 // Allocate enough space for the StringLiteral plus an array of locations for 540 // any concatenated string tokens. 541 void *Mem = C.Allocate(sizeof(StringLiteral)+ 542 sizeof(SourceLocation)*(NumStrs-1), 543 llvm::alignOf<StringLiteral>()); 544 StringLiteral *SL = new (Mem) StringLiteral(Ty); 545 546 // OPTIMIZE: could allocate this appended to the StringLiteral. 547 char *AStrData = new (C, 1) char[Str.size()]; 548 memcpy(AStrData, Str.data(), Str.size()); 549 SL->StrData = AStrData; 550 SL->ByteLength = Str.size(); 551 SL->Kind = Kind; 552 SL->IsPascal = Pascal; 553 SL->TokLocs[0] = Loc[0]; 554 SL->NumConcatenated = NumStrs; 555 556 if (NumStrs != 1) 557 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 558 return SL; 559} 560 561StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 562 void *Mem = C.Allocate(sizeof(StringLiteral)+ 563 sizeof(SourceLocation)*(NumStrs-1), 564 llvm::alignOf<StringLiteral>()); 565 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 566 SL->StrData = 0; 567 SL->ByteLength = 0; 568 SL->NumConcatenated = NumStrs; 569 return SL; 570} 571 572void StringLiteral::setString(ASTContext &C, StringRef Str) { 573 char *AStrData = new (C, 1) char[Str.size()]; 574 memcpy(AStrData, Str.data(), Str.size()); 575 StrData = AStrData; 576 ByteLength = Str.size(); 577} 578 579/// getLocationOfByte - Return a source location that points to the specified 580/// byte of this string literal. 581/// 582/// Strings are amazingly complex. They can be formed from multiple tokens and 583/// can have escape sequences in them in addition to the usual trigraph and 584/// escaped newline business. This routine handles this complexity. 585/// 586SourceLocation StringLiteral:: 587getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 588 const LangOptions &Features, const TargetInfo &Target) const { 589 assert(Kind == StringLiteral::Ascii && "This only works for ASCII strings"); 590 591 // Loop over all of the tokens in this string until we find the one that 592 // contains the byte we're looking for. 593 unsigned TokNo = 0; 594 while (1) { 595 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 596 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 597 598 // Get the spelling of the string so that we can get the data that makes up 599 // the string literal, not the identifier for the macro it is potentially 600 // expanded through. 601 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 602 603 // Re-lex the token to get its length and original spelling. 604 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 605 bool Invalid = false; 606 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 607 if (Invalid) 608 return StrTokSpellingLoc; 609 610 const char *StrData = Buffer.data()+LocInfo.second; 611 612 // Create a langops struct and enable trigraphs. This is sufficient for 613 // relexing tokens. 614 LangOptions LangOpts; 615 LangOpts.Trigraphs = true; 616 617 // Create a lexer starting at the beginning of this token. 618 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 619 Buffer.end()); 620 Token TheTok; 621 TheLexer.LexFromRawLexer(TheTok); 622 623 // Use the StringLiteralParser to compute the length of the string in bytes. 624 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 625 unsigned TokNumBytes = SLP.GetStringLength(); 626 627 // If the byte is in this token, return the location of the byte. 628 if (ByteNo < TokNumBytes || 629 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) { 630 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 631 632 // Now that we know the offset of the token in the spelling, use the 633 // preprocessor to get the offset in the original source. 634 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 635 } 636 637 // Move to the next string token. 638 ++TokNo; 639 ByteNo -= TokNumBytes; 640 } 641} 642 643 644 645/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 646/// corresponds to, e.g. "sizeof" or "[pre]++". 647const char *UnaryOperator::getOpcodeStr(Opcode Op) { 648 switch (Op) { 649 default: assert(0 && "Unknown unary operator"); 650 case UO_PostInc: return "++"; 651 case UO_PostDec: return "--"; 652 case UO_PreInc: return "++"; 653 case UO_PreDec: return "--"; 654 case UO_AddrOf: return "&"; 655 case UO_Deref: return "*"; 656 case UO_Plus: return "+"; 657 case UO_Minus: return "-"; 658 case UO_Not: return "~"; 659 case UO_LNot: return "!"; 660 case UO_Real: return "__real"; 661 case UO_Imag: return "__imag"; 662 case UO_Extension: return "__extension__"; 663 } 664} 665 666UnaryOperatorKind 667UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 668 switch (OO) { 669 default: assert(false && "No unary operator for overloaded function"); 670 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 671 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 672 case OO_Amp: return UO_AddrOf; 673 case OO_Star: return UO_Deref; 674 case OO_Plus: return UO_Plus; 675 case OO_Minus: return UO_Minus; 676 case OO_Tilde: return UO_Not; 677 case OO_Exclaim: return UO_LNot; 678 } 679} 680 681OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 682 switch (Opc) { 683 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 684 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 685 case UO_AddrOf: return OO_Amp; 686 case UO_Deref: return OO_Star; 687 case UO_Plus: return OO_Plus; 688 case UO_Minus: return OO_Minus; 689 case UO_Not: return OO_Tilde; 690 case UO_LNot: return OO_Exclaim; 691 default: return OO_None; 692 } 693} 694 695 696//===----------------------------------------------------------------------===// 697// Postfix Operators. 698//===----------------------------------------------------------------------===// 699 700CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 701 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 702 SourceLocation rparenloc) 703 : Expr(SC, t, VK, OK_Ordinary, 704 fn->isTypeDependent(), 705 fn->isValueDependent(), 706 fn->isInstantiationDependent(), 707 fn->containsUnexpandedParameterPack()), 708 NumArgs(numargs) { 709 710 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 711 SubExprs[FN] = fn; 712 for (unsigned i = 0; i != numargs; ++i) { 713 if (args[i]->isTypeDependent()) 714 ExprBits.TypeDependent = true; 715 if (args[i]->isValueDependent()) 716 ExprBits.ValueDependent = true; 717 if (args[i]->isInstantiationDependent()) 718 ExprBits.InstantiationDependent = true; 719 if (args[i]->containsUnexpandedParameterPack()) 720 ExprBits.ContainsUnexpandedParameterPack = true; 721 722 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 723 } 724 725 CallExprBits.NumPreArgs = NumPreArgs; 726 RParenLoc = rparenloc; 727} 728 729CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 730 QualType t, ExprValueKind VK, SourceLocation rparenloc) 731 : Expr(CallExprClass, t, VK, OK_Ordinary, 732 fn->isTypeDependent(), 733 fn->isValueDependent(), 734 fn->isInstantiationDependent(), 735 fn->containsUnexpandedParameterPack()), 736 NumArgs(numargs) { 737 738 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 739 SubExprs[FN] = fn; 740 for (unsigned i = 0; i != numargs; ++i) { 741 if (args[i]->isTypeDependent()) 742 ExprBits.TypeDependent = true; 743 if (args[i]->isValueDependent()) 744 ExprBits.ValueDependent = true; 745 if (args[i]->isInstantiationDependent()) 746 ExprBits.InstantiationDependent = true; 747 if (args[i]->containsUnexpandedParameterPack()) 748 ExprBits.ContainsUnexpandedParameterPack = true; 749 750 SubExprs[i+PREARGS_START] = args[i]; 751 } 752 753 CallExprBits.NumPreArgs = 0; 754 RParenLoc = rparenloc; 755} 756 757CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 758 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 759 // FIXME: Why do we allocate this? 760 SubExprs = new (C) Stmt*[PREARGS_START]; 761 CallExprBits.NumPreArgs = 0; 762} 763 764CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 765 EmptyShell Empty) 766 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 767 // FIXME: Why do we allocate this? 768 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 769 CallExprBits.NumPreArgs = NumPreArgs; 770} 771 772Decl *CallExpr::getCalleeDecl() { 773 Expr *CEE = getCallee()->IgnoreParenCasts(); 774 775 while (SubstNonTypeTemplateParmExpr *NTTP 776 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) { 777 CEE = NTTP->getReplacement()->IgnoreParenCasts(); 778 } 779 780 // If we're calling a dereference, look at the pointer instead. 781 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 782 if (BO->isPtrMemOp()) 783 CEE = BO->getRHS()->IgnoreParenCasts(); 784 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 785 if (UO->getOpcode() == UO_Deref) 786 CEE = UO->getSubExpr()->IgnoreParenCasts(); 787 } 788 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 789 return DRE->getDecl(); 790 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 791 return ME->getMemberDecl(); 792 793 return 0; 794} 795 796FunctionDecl *CallExpr::getDirectCallee() { 797 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 798} 799 800/// setNumArgs - This changes the number of arguments present in this call. 801/// Any orphaned expressions are deleted by this, and any new operands are set 802/// to null. 803void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 804 // No change, just return. 805 if (NumArgs == getNumArgs()) return; 806 807 // If shrinking # arguments, just delete the extras and forgot them. 808 if (NumArgs < getNumArgs()) { 809 this->NumArgs = NumArgs; 810 return; 811 } 812 813 // Otherwise, we are growing the # arguments. New an bigger argument array. 814 unsigned NumPreArgs = getNumPreArgs(); 815 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 816 // Copy over args. 817 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 818 NewSubExprs[i] = SubExprs[i]; 819 // Null out new args. 820 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 821 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 822 NewSubExprs[i] = 0; 823 824 if (SubExprs) C.Deallocate(SubExprs); 825 SubExprs = NewSubExprs; 826 this->NumArgs = NumArgs; 827} 828 829/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 830/// not, return 0. 831unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const { 832 // All simple function calls (e.g. func()) are implicitly cast to pointer to 833 // function. As a result, we try and obtain the DeclRefExpr from the 834 // ImplicitCastExpr. 835 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 836 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 837 return 0; 838 839 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 840 if (!DRE) 841 return 0; 842 843 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 844 if (!FDecl) 845 return 0; 846 847 if (!FDecl->getIdentifier()) 848 return 0; 849 850 return FDecl->getBuiltinID(); 851} 852 853QualType CallExpr::getCallReturnType() const { 854 QualType CalleeType = getCallee()->getType(); 855 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 856 CalleeType = FnTypePtr->getPointeeType(); 857 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 858 CalleeType = BPT->getPointeeType(); 859 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) 860 // This should never be overloaded and so should never return null. 861 CalleeType = Expr::findBoundMemberType(getCallee()); 862 863 const FunctionType *FnType = CalleeType->castAs<FunctionType>(); 864 return FnType->getResultType(); 865} 866 867SourceRange CallExpr::getSourceRange() const { 868 if (isa<CXXOperatorCallExpr>(this)) 869 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 870 871 SourceLocation begin = getCallee()->getLocStart(); 872 if (begin.isInvalid() && getNumArgs() > 0) 873 begin = getArg(0)->getLocStart(); 874 SourceLocation end = getRParenLoc(); 875 if (end.isInvalid() && getNumArgs() > 0) 876 end = getArg(getNumArgs() - 1)->getLocEnd(); 877 return SourceRange(begin, end); 878} 879 880OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 881 SourceLocation OperatorLoc, 882 TypeSourceInfo *tsi, 883 OffsetOfNode* compsPtr, unsigned numComps, 884 Expr** exprsPtr, unsigned numExprs, 885 SourceLocation RParenLoc) { 886 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 887 sizeof(OffsetOfNode) * numComps + 888 sizeof(Expr*) * numExprs); 889 890 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 891 exprsPtr, numExprs, RParenLoc); 892} 893 894OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 895 unsigned numComps, unsigned numExprs) { 896 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 897 sizeof(OffsetOfNode) * numComps + 898 sizeof(Expr*) * numExprs); 899 return new (Mem) OffsetOfExpr(numComps, numExprs); 900} 901 902OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 903 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 904 OffsetOfNode* compsPtr, unsigned numComps, 905 Expr** exprsPtr, unsigned numExprs, 906 SourceLocation RParenLoc) 907 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 908 /*TypeDependent=*/false, 909 /*ValueDependent=*/tsi->getType()->isDependentType(), 910 tsi->getType()->isInstantiationDependentType(), 911 tsi->getType()->containsUnexpandedParameterPack()), 912 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 913 NumComps(numComps), NumExprs(numExprs) 914{ 915 for(unsigned i = 0; i < numComps; ++i) { 916 setComponent(i, compsPtr[i]); 917 } 918 919 for(unsigned i = 0; i < numExprs; ++i) { 920 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 921 ExprBits.ValueDependent = true; 922 if (exprsPtr[i]->containsUnexpandedParameterPack()) 923 ExprBits.ContainsUnexpandedParameterPack = true; 924 925 setIndexExpr(i, exprsPtr[i]); 926 } 927} 928 929IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 930 assert(getKind() == Field || getKind() == Identifier); 931 if (getKind() == Field) 932 return getField()->getIdentifier(); 933 934 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 935} 936 937MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 938 NestedNameSpecifierLoc QualifierLoc, 939 ValueDecl *memberdecl, 940 DeclAccessPair founddecl, 941 DeclarationNameInfo nameinfo, 942 const TemplateArgumentListInfo *targs, 943 QualType ty, 944 ExprValueKind vk, 945 ExprObjectKind ok) { 946 std::size_t Size = sizeof(MemberExpr); 947 948 bool hasQualOrFound = (QualifierLoc || 949 founddecl.getDecl() != memberdecl || 950 founddecl.getAccess() != memberdecl->getAccess()); 951 if (hasQualOrFound) 952 Size += sizeof(MemberNameQualifier); 953 954 if (targs) 955 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 956 957 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 958 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 959 ty, vk, ok); 960 961 if (hasQualOrFound) { 962 // FIXME: Wrong. We should be looking at the member declaration we found. 963 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 964 E->setValueDependent(true); 965 E->setTypeDependent(true); 966 E->setInstantiationDependent(true); 967 } 968 else if (QualifierLoc && 969 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) 970 E->setInstantiationDependent(true); 971 972 E->HasQualifierOrFoundDecl = true; 973 974 MemberNameQualifier *NQ = E->getMemberQualifier(); 975 NQ->QualifierLoc = QualifierLoc; 976 NQ->FoundDecl = founddecl; 977 } 978 979 if (targs) { 980 bool Dependent = false; 981 bool InstantiationDependent = false; 982 bool ContainsUnexpandedParameterPack = false; 983 E->HasExplicitTemplateArgumentList = true; 984 E->getExplicitTemplateArgs().initializeFrom(*targs, Dependent, 985 InstantiationDependent, 986 ContainsUnexpandedParameterPack); 987 if (InstantiationDependent) 988 E->setInstantiationDependent(true); 989 } 990 991 return E; 992} 993 994SourceRange MemberExpr::getSourceRange() const { 995 SourceLocation StartLoc; 996 if (isImplicitAccess()) { 997 if (hasQualifier()) 998 StartLoc = getQualifierLoc().getBeginLoc(); 999 else 1000 StartLoc = MemberLoc; 1001 } else { 1002 // FIXME: We don't want this to happen. Rather, we should be able to 1003 // detect all kinds of implicit accesses more cleanly. 1004 StartLoc = getBase()->getLocStart(); 1005 if (StartLoc.isInvalid()) 1006 StartLoc = MemberLoc; 1007 } 1008 1009 SourceLocation EndLoc = 1010 HasExplicitTemplateArgumentList? getRAngleLoc() 1011 : getMemberNameInfo().getEndLoc(); 1012 1013 return SourceRange(StartLoc, EndLoc); 1014} 1015 1016void CastExpr::CheckCastConsistency() const { 1017 switch (getCastKind()) { 1018 case CK_DerivedToBase: 1019 case CK_UncheckedDerivedToBase: 1020 case CK_DerivedToBaseMemberPointer: 1021 case CK_BaseToDerived: 1022 case CK_BaseToDerivedMemberPointer: 1023 assert(!path_empty() && "Cast kind should have a base path!"); 1024 break; 1025 1026 case CK_CPointerToObjCPointerCast: 1027 assert(getType()->isObjCObjectPointerType()); 1028 assert(getSubExpr()->getType()->isPointerType()); 1029 goto CheckNoBasePath; 1030 1031 case CK_BlockPointerToObjCPointerCast: 1032 assert(getType()->isObjCObjectPointerType()); 1033 assert(getSubExpr()->getType()->isBlockPointerType()); 1034 goto CheckNoBasePath; 1035 1036 case CK_BitCast: 1037 // Arbitrary casts to C pointer types count as bitcasts. 1038 // Otherwise, we should only have block and ObjC pointer casts 1039 // here if they stay within the type kind. 1040 if (!getType()->isPointerType()) { 1041 assert(getType()->isObjCObjectPointerType() == 1042 getSubExpr()->getType()->isObjCObjectPointerType()); 1043 assert(getType()->isBlockPointerType() == 1044 getSubExpr()->getType()->isBlockPointerType()); 1045 } 1046 goto CheckNoBasePath; 1047 1048 case CK_AnyPointerToBlockPointerCast: 1049 assert(getType()->isBlockPointerType()); 1050 assert(getSubExpr()->getType()->isAnyPointerType() && 1051 !getSubExpr()->getType()->isBlockPointerType()); 1052 goto CheckNoBasePath; 1053 1054 // These should not have an inheritance path. 1055 case CK_Dynamic: 1056 case CK_ToUnion: 1057 case CK_ArrayToPointerDecay: 1058 case CK_FunctionToPointerDecay: 1059 case CK_NullToMemberPointer: 1060 case CK_NullToPointer: 1061 case CK_ConstructorConversion: 1062 case CK_IntegralToPointer: 1063 case CK_PointerToIntegral: 1064 case CK_ToVoid: 1065 case CK_VectorSplat: 1066 case CK_IntegralCast: 1067 case CK_IntegralToFloating: 1068 case CK_FloatingToIntegral: 1069 case CK_FloatingCast: 1070 case CK_ObjCObjectLValueCast: 1071 case CK_FloatingRealToComplex: 1072 case CK_FloatingComplexToReal: 1073 case CK_FloatingComplexCast: 1074 case CK_FloatingComplexToIntegralComplex: 1075 case CK_IntegralRealToComplex: 1076 case CK_IntegralComplexToReal: 1077 case CK_IntegralComplexCast: 1078 case CK_IntegralComplexToFloatingComplex: 1079 case CK_ARCProduceObject: 1080 case CK_ARCConsumeObject: 1081 case CK_ARCReclaimReturnedObject: 1082 case CK_ARCExtendBlockObject: 1083 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 1084 goto CheckNoBasePath; 1085 1086 case CK_Dependent: 1087 case CK_LValueToRValue: 1088 case CK_GetObjCProperty: 1089 case CK_NoOp: 1090 case CK_PointerToBoolean: 1091 case CK_IntegralToBoolean: 1092 case CK_FloatingToBoolean: 1093 case CK_MemberPointerToBoolean: 1094 case CK_FloatingComplexToBoolean: 1095 case CK_IntegralComplexToBoolean: 1096 case CK_LValueBitCast: // -> bool& 1097 case CK_UserDefinedConversion: // operator bool() 1098 CheckNoBasePath: 1099 assert(path_empty() && "Cast kind should not have a base path!"); 1100 break; 1101 } 1102} 1103 1104const char *CastExpr::getCastKindName() const { 1105 switch (getCastKind()) { 1106 case CK_Dependent: 1107 return "Dependent"; 1108 case CK_BitCast: 1109 return "BitCast"; 1110 case CK_LValueBitCast: 1111 return "LValueBitCast"; 1112 case CK_LValueToRValue: 1113 return "LValueToRValue"; 1114 case CK_GetObjCProperty: 1115 return "GetObjCProperty"; 1116 case CK_NoOp: 1117 return "NoOp"; 1118 case CK_BaseToDerived: 1119 return "BaseToDerived"; 1120 case CK_DerivedToBase: 1121 return "DerivedToBase"; 1122 case CK_UncheckedDerivedToBase: 1123 return "UncheckedDerivedToBase"; 1124 case CK_Dynamic: 1125 return "Dynamic"; 1126 case CK_ToUnion: 1127 return "ToUnion"; 1128 case CK_ArrayToPointerDecay: 1129 return "ArrayToPointerDecay"; 1130 case CK_FunctionToPointerDecay: 1131 return "FunctionToPointerDecay"; 1132 case CK_NullToMemberPointer: 1133 return "NullToMemberPointer"; 1134 case CK_NullToPointer: 1135 return "NullToPointer"; 1136 case CK_BaseToDerivedMemberPointer: 1137 return "BaseToDerivedMemberPointer"; 1138 case CK_DerivedToBaseMemberPointer: 1139 return "DerivedToBaseMemberPointer"; 1140 case CK_UserDefinedConversion: 1141 return "UserDefinedConversion"; 1142 case CK_ConstructorConversion: 1143 return "ConstructorConversion"; 1144 case CK_IntegralToPointer: 1145 return "IntegralToPointer"; 1146 case CK_PointerToIntegral: 1147 return "PointerToIntegral"; 1148 case CK_PointerToBoolean: 1149 return "PointerToBoolean"; 1150 case CK_ToVoid: 1151 return "ToVoid"; 1152 case CK_VectorSplat: 1153 return "VectorSplat"; 1154 case CK_IntegralCast: 1155 return "IntegralCast"; 1156 case CK_IntegralToBoolean: 1157 return "IntegralToBoolean"; 1158 case CK_IntegralToFloating: 1159 return "IntegralToFloating"; 1160 case CK_FloatingToIntegral: 1161 return "FloatingToIntegral"; 1162 case CK_FloatingCast: 1163 return "FloatingCast"; 1164 case CK_FloatingToBoolean: 1165 return "FloatingToBoolean"; 1166 case CK_MemberPointerToBoolean: 1167 return "MemberPointerToBoolean"; 1168 case CK_CPointerToObjCPointerCast: 1169 return "CPointerToObjCPointerCast"; 1170 case CK_BlockPointerToObjCPointerCast: 1171 return "BlockPointerToObjCPointerCast"; 1172 case CK_AnyPointerToBlockPointerCast: 1173 return "AnyPointerToBlockPointerCast"; 1174 case CK_ObjCObjectLValueCast: 1175 return "ObjCObjectLValueCast"; 1176 case CK_FloatingRealToComplex: 1177 return "FloatingRealToComplex"; 1178 case CK_FloatingComplexToReal: 1179 return "FloatingComplexToReal"; 1180 case CK_FloatingComplexToBoolean: 1181 return "FloatingComplexToBoolean"; 1182 case CK_FloatingComplexCast: 1183 return "FloatingComplexCast"; 1184 case CK_FloatingComplexToIntegralComplex: 1185 return "FloatingComplexToIntegralComplex"; 1186 case CK_IntegralRealToComplex: 1187 return "IntegralRealToComplex"; 1188 case CK_IntegralComplexToReal: 1189 return "IntegralComplexToReal"; 1190 case CK_IntegralComplexToBoolean: 1191 return "IntegralComplexToBoolean"; 1192 case CK_IntegralComplexCast: 1193 return "IntegralComplexCast"; 1194 case CK_IntegralComplexToFloatingComplex: 1195 return "IntegralComplexToFloatingComplex"; 1196 case CK_ARCConsumeObject: 1197 return "ARCConsumeObject"; 1198 case CK_ARCProduceObject: 1199 return "ARCProduceObject"; 1200 case CK_ARCReclaimReturnedObject: 1201 return "ARCReclaimReturnedObject"; 1202 case CK_ARCExtendBlockObject: 1203 return "ARCCExtendBlockObject"; 1204 } 1205 1206 llvm_unreachable("Unhandled cast kind!"); 1207 return 0; 1208} 1209 1210Expr *CastExpr::getSubExprAsWritten() { 1211 Expr *SubExpr = 0; 1212 CastExpr *E = this; 1213 do { 1214 SubExpr = E->getSubExpr(); 1215 1216 // Skip through reference binding to temporary. 1217 if (MaterializeTemporaryExpr *Materialize 1218 = dyn_cast<MaterializeTemporaryExpr>(SubExpr)) 1219 SubExpr = Materialize->GetTemporaryExpr(); 1220 1221 // Skip any temporary bindings; they're implicit. 1222 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1223 SubExpr = Binder->getSubExpr(); 1224 1225 // Conversions by constructor and conversion functions have a 1226 // subexpression describing the call; strip it off. 1227 if (E->getCastKind() == CK_ConstructorConversion) 1228 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1229 else if (E->getCastKind() == CK_UserDefinedConversion) 1230 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1231 1232 // If the subexpression we're left with is an implicit cast, look 1233 // through that, too. 1234 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1235 1236 return SubExpr; 1237} 1238 1239CXXBaseSpecifier **CastExpr::path_buffer() { 1240 switch (getStmtClass()) { 1241#define ABSTRACT_STMT(x) 1242#define CASTEXPR(Type, Base) \ 1243 case Stmt::Type##Class: \ 1244 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1245#define STMT(Type, Base) 1246#include "clang/AST/StmtNodes.inc" 1247 default: 1248 llvm_unreachable("non-cast expressions not possible here"); 1249 return 0; 1250 } 1251} 1252 1253void CastExpr::setCastPath(const CXXCastPath &Path) { 1254 assert(Path.size() == path_size()); 1255 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1256} 1257 1258ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1259 CastKind Kind, Expr *Operand, 1260 const CXXCastPath *BasePath, 1261 ExprValueKind VK) { 1262 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1263 void *Buffer = 1264 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1265 ImplicitCastExpr *E = 1266 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1267 if (PathSize) E->setCastPath(*BasePath); 1268 return E; 1269} 1270 1271ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1272 unsigned PathSize) { 1273 void *Buffer = 1274 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1275 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1276} 1277 1278 1279CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1280 ExprValueKind VK, CastKind K, Expr *Op, 1281 const CXXCastPath *BasePath, 1282 TypeSourceInfo *WrittenTy, 1283 SourceLocation L, SourceLocation R) { 1284 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1285 void *Buffer = 1286 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1287 CStyleCastExpr *E = 1288 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1289 if (PathSize) E->setCastPath(*BasePath); 1290 return E; 1291} 1292 1293CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1294 void *Buffer = 1295 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1296 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1297} 1298 1299/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1300/// corresponds to, e.g. "<<=". 1301const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1302 switch (Op) { 1303 case BO_PtrMemD: return ".*"; 1304 case BO_PtrMemI: return "->*"; 1305 case BO_Mul: return "*"; 1306 case BO_Div: return "/"; 1307 case BO_Rem: return "%"; 1308 case BO_Add: return "+"; 1309 case BO_Sub: return "-"; 1310 case BO_Shl: return "<<"; 1311 case BO_Shr: return ">>"; 1312 case BO_LT: return "<"; 1313 case BO_GT: return ">"; 1314 case BO_LE: return "<="; 1315 case BO_GE: return ">="; 1316 case BO_EQ: return "=="; 1317 case BO_NE: return "!="; 1318 case BO_And: return "&"; 1319 case BO_Xor: return "^"; 1320 case BO_Or: return "|"; 1321 case BO_LAnd: return "&&"; 1322 case BO_LOr: return "||"; 1323 case BO_Assign: return "="; 1324 case BO_MulAssign: return "*="; 1325 case BO_DivAssign: return "/="; 1326 case BO_RemAssign: return "%="; 1327 case BO_AddAssign: return "+="; 1328 case BO_SubAssign: return "-="; 1329 case BO_ShlAssign: return "<<="; 1330 case BO_ShrAssign: return ">>="; 1331 case BO_AndAssign: return "&="; 1332 case BO_XorAssign: return "^="; 1333 case BO_OrAssign: return "|="; 1334 case BO_Comma: return ","; 1335 } 1336 1337 return ""; 1338} 1339 1340BinaryOperatorKind 1341BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1342 switch (OO) { 1343 default: assert(false && "Not an overloadable binary operator"); 1344 case OO_Plus: return BO_Add; 1345 case OO_Minus: return BO_Sub; 1346 case OO_Star: return BO_Mul; 1347 case OO_Slash: return BO_Div; 1348 case OO_Percent: return BO_Rem; 1349 case OO_Caret: return BO_Xor; 1350 case OO_Amp: return BO_And; 1351 case OO_Pipe: return BO_Or; 1352 case OO_Equal: return BO_Assign; 1353 case OO_Less: return BO_LT; 1354 case OO_Greater: return BO_GT; 1355 case OO_PlusEqual: return BO_AddAssign; 1356 case OO_MinusEqual: return BO_SubAssign; 1357 case OO_StarEqual: return BO_MulAssign; 1358 case OO_SlashEqual: return BO_DivAssign; 1359 case OO_PercentEqual: return BO_RemAssign; 1360 case OO_CaretEqual: return BO_XorAssign; 1361 case OO_AmpEqual: return BO_AndAssign; 1362 case OO_PipeEqual: return BO_OrAssign; 1363 case OO_LessLess: return BO_Shl; 1364 case OO_GreaterGreater: return BO_Shr; 1365 case OO_LessLessEqual: return BO_ShlAssign; 1366 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1367 case OO_EqualEqual: return BO_EQ; 1368 case OO_ExclaimEqual: return BO_NE; 1369 case OO_LessEqual: return BO_LE; 1370 case OO_GreaterEqual: return BO_GE; 1371 case OO_AmpAmp: return BO_LAnd; 1372 case OO_PipePipe: return BO_LOr; 1373 case OO_Comma: return BO_Comma; 1374 case OO_ArrowStar: return BO_PtrMemI; 1375 } 1376} 1377 1378OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1379 static const OverloadedOperatorKind OverOps[] = { 1380 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1381 OO_Star, OO_Slash, OO_Percent, 1382 OO_Plus, OO_Minus, 1383 OO_LessLess, OO_GreaterGreater, 1384 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1385 OO_EqualEqual, OO_ExclaimEqual, 1386 OO_Amp, 1387 OO_Caret, 1388 OO_Pipe, 1389 OO_AmpAmp, 1390 OO_PipePipe, 1391 OO_Equal, OO_StarEqual, 1392 OO_SlashEqual, OO_PercentEqual, 1393 OO_PlusEqual, OO_MinusEqual, 1394 OO_LessLessEqual, OO_GreaterGreaterEqual, 1395 OO_AmpEqual, OO_CaretEqual, 1396 OO_PipeEqual, 1397 OO_Comma 1398 }; 1399 return OverOps[Opc]; 1400} 1401 1402InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1403 Expr **initExprs, unsigned numInits, 1404 SourceLocation rbraceloc) 1405 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1406 false, false), 1407 InitExprs(C, numInits), 1408 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1409 HadArrayRangeDesignator(false) 1410{ 1411 for (unsigned I = 0; I != numInits; ++I) { 1412 if (initExprs[I]->isTypeDependent()) 1413 ExprBits.TypeDependent = true; 1414 if (initExprs[I]->isValueDependent()) 1415 ExprBits.ValueDependent = true; 1416 if (initExprs[I]->isInstantiationDependent()) 1417 ExprBits.InstantiationDependent = true; 1418 if (initExprs[I]->containsUnexpandedParameterPack()) 1419 ExprBits.ContainsUnexpandedParameterPack = true; 1420 } 1421 1422 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1423} 1424 1425void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1426 if (NumInits > InitExprs.size()) 1427 InitExprs.reserve(C, NumInits); 1428} 1429 1430void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1431 InitExprs.resize(C, NumInits, 0); 1432} 1433 1434Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1435 if (Init >= InitExprs.size()) { 1436 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1437 InitExprs.back() = expr; 1438 return 0; 1439 } 1440 1441 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1442 InitExprs[Init] = expr; 1443 return Result; 1444} 1445 1446void InitListExpr::setArrayFiller(Expr *filler) { 1447 ArrayFillerOrUnionFieldInit = filler; 1448 // Fill out any "holes" in the array due to designated initializers. 1449 Expr **inits = getInits(); 1450 for (unsigned i = 0, e = getNumInits(); i != e; ++i) 1451 if (inits[i] == 0) 1452 inits[i] = filler; 1453} 1454 1455SourceRange InitListExpr::getSourceRange() const { 1456 if (SyntacticForm) 1457 return SyntacticForm->getSourceRange(); 1458 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1459 if (Beg.isInvalid()) { 1460 // Find the first non-null initializer. 1461 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1462 E = InitExprs.end(); 1463 I != E; ++I) { 1464 if (Stmt *S = *I) { 1465 Beg = S->getLocStart(); 1466 break; 1467 } 1468 } 1469 } 1470 if (End.isInvalid()) { 1471 // Find the first non-null initializer from the end. 1472 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1473 E = InitExprs.rend(); 1474 I != E; ++I) { 1475 if (Stmt *S = *I) { 1476 End = S->getSourceRange().getEnd(); 1477 break; 1478 } 1479 } 1480 } 1481 return SourceRange(Beg, End); 1482} 1483 1484/// getFunctionType - Return the underlying function type for this block. 1485/// 1486const FunctionType *BlockExpr::getFunctionType() const { 1487 return getType()->getAs<BlockPointerType>()-> 1488 getPointeeType()->getAs<FunctionType>(); 1489} 1490 1491SourceLocation BlockExpr::getCaretLocation() const { 1492 return TheBlock->getCaretLocation(); 1493} 1494const Stmt *BlockExpr::getBody() const { 1495 return TheBlock->getBody(); 1496} 1497Stmt *BlockExpr::getBody() { 1498 return TheBlock->getBody(); 1499} 1500 1501 1502//===----------------------------------------------------------------------===// 1503// Generic Expression Routines 1504//===----------------------------------------------------------------------===// 1505 1506/// isUnusedResultAWarning - Return true if this immediate expression should 1507/// be warned about if the result is unused. If so, fill in Loc and Ranges 1508/// with location to warn on and the source range[s] to report with the 1509/// warning. 1510bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1511 SourceRange &R2, ASTContext &Ctx) const { 1512 // Don't warn if the expr is type dependent. The type could end up 1513 // instantiating to void. 1514 if (isTypeDependent()) 1515 return false; 1516 1517 switch (getStmtClass()) { 1518 default: 1519 if (getType()->isVoidType()) 1520 return false; 1521 Loc = getExprLoc(); 1522 R1 = getSourceRange(); 1523 return true; 1524 case ParenExprClass: 1525 return cast<ParenExpr>(this)->getSubExpr()-> 1526 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1527 case GenericSelectionExprClass: 1528 return cast<GenericSelectionExpr>(this)->getResultExpr()-> 1529 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1530 case UnaryOperatorClass: { 1531 const UnaryOperator *UO = cast<UnaryOperator>(this); 1532 1533 switch (UO->getOpcode()) { 1534 default: break; 1535 case UO_PostInc: 1536 case UO_PostDec: 1537 case UO_PreInc: 1538 case UO_PreDec: // ++/-- 1539 return false; // Not a warning. 1540 case UO_Deref: 1541 // Dereferencing a volatile pointer is a side-effect. 1542 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1543 return false; 1544 break; 1545 case UO_Real: 1546 case UO_Imag: 1547 // accessing a piece of a volatile complex is a side-effect. 1548 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1549 .isVolatileQualified()) 1550 return false; 1551 break; 1552 case UO_Extension: 1553 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1554 } 1555 Loc = UO->getOperatorLoc(); 1556 R1 = UO->getSubExpr()->getSourceRange(); 1557 return true; 1558 } 1559 case BinaryOperatorClass: { 1560 const BinaryOperator *BO = cast<BinaryOperator>(this); 1561 switch (BO->getOpcode()) { 1562 default: 1563 break; 1564 // Consider the RHS of comma for side effects. LHS was checked by 1565 // Sema::CheckCommaOperands. 1566 case BO_Comma: 1567 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1568 // lvalue-ness) of an assignment written in a macro. 1569 if (IntegerLiteral *IE = 1570 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1571 if (IE->getValue() == 0) 1572 return false; 1573 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1574 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1575 case BO_LAnd: 1576 case BO_LOr: 1577 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1578 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1579 return false; 1580 break; 1581 } 1582 if (BO->isAssignmentOp()) 1583 return false; 1584 Loc = BO->getOperatorLoc(); 1585 R1 = BO->getLHS()->getSourceRange(); 1586 R2 = BO->getRHS()->getSourceRange(); 1587 return true; 1588 } 1589 case CompoundAssignOperatorClass: 1590 case VAArgExprClass: 1591 return false; 1592 1593 case ConditionalOperatorClass: { 1594 // If only one of the LHS or RHS is a warning, the operator might 1595 // be being used for control flow. Only warn if both the LHS and 1596 // RHS are warnings. 1597 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1598 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1599 return false; 1600 if (!Exp->getLHS()) 1601 return true; 1602 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1603 } 1604 1605 case MemberExprClass: 1606 // If the base pointer or element is to a volatile pointer/field, accessing 1607 // it is a side effect. 1608 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1609 return false; 1610 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1611 R1 = SourceRange(Loc, Loc); 1612 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1613 return true; 1614 1615 case ArraySubscriptExprClass: 1616 // If the base pointer or element is to a volatile pointer/field, accessing 1617 // it is a side effect. 1618 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1619 return false; 1620 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1621 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1622 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1623 return true; 1624 1625 case CXXOperatorCallExprClass: { 1626 // We warn about operator== and operator!= even when user-defined operator 1627 // overloads as there is no reasonable way to define these such that they 1628 // have non-trivial, desirable side-effects. See the -Wunused-comparison 1629 // warning: these operators are commonly typo'ed, and so warning on them 1630 // provides additional value as well. If this list is updated, 1631 // DiagnoseUnusedComparison should be as well. 1632 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this); 1633 if (Op->getOperator() == OO_EqualEqual || 1634 Op->getOperator() == OO_ExclaimEqual) 1635 return true; 1636 1637 // Fallthrough for generic call handling. 1638 } 1639 case CallExprClass: 1640 case CXXMemberCallExprClass: { 1641 // If this is a direct call, get the callee. 1642 const CallExpr *CE = cast<CallExpr>(this); 1643 if (const Decl *FD = CE->getCalleeDecl()) { 1644 // If the callee has attribute pure, const, or warn_unused_result, warn 1645 // about it. void foo() { strlen("bar"); } should warn. 1646 // 1647 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1648 // updated to match for QoI. 1649 if (FD->getAttr<WarnUnusedResultAttr>() || 1650 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1651 Loc = CE->getCallee()->getLocStart(); 1652 R1 = CE->getCallee()->getSourceRange(); 1653 1654 if (unsigned NumArgs = CE->getNumArgs()) 1655 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1656 CE->getArg(NumArgs-1)->getLocEnd()); 1657 return true; 1658 } 1659 } 1660 return false; 1661 } 1662 1663 case CXXTemporaryObjectExprClass: 1664 case CXXConstructExprClass: 1665 return false; 1666 1667 case ObjCMessageExprClass: { 1668 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1669 if (Ctx.getLangOptions().ObjCAutoRefCount && 1670 ME->isInstanceMessage() && 1671 !ME->getType()->isVoidType() && 1672 ME->getSelector().getIdentifierInfoForSlot(0) && 1673 ME->getSelector().getIdentifierInfoForSlot(0) 1674 ->getName().startswith("init")) { 1675 Loc = getExprLoc(); 1676 R1 = ME->getSourceRange(); 1677 return true; 1678 } 1679 1680 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1681 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1682 Loc = getExprLoc(); 1683 return true; 1684 } 1685 return false; 1686 } 1687 1688 case ObjCPropertyRefExprClass: 1689 Loc = getExprLoc(); 1690 R1 = getSourceRange(); 1691 return true; 1692 1693 case StmtExprClass: { 1694 // Statement exprs don't logically have side effects themselves, but are 1695 // sometimes used in macros in ways that give them a type that is unused. 1696 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1697 // however, if the result of the stmt expr is dead, we don't want to emit a 1698 // warning. 1699 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1700 if (!CS->body_empty()) { 1701 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1702 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1703 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1704 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1705 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1706 } 1707 1708 if (getType()->isVoidType()) 1709 return false; 1710 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1711 R1 = getSourceRange(); 1712 return true; 1713 } 1714 case CStyleCastExprClass: 1715 // If this is an explicit cast to void, allow it. People do this when they 1716 // think they know what they're doing :). 1717 if (getType()->isVoidType()) 1718 return false; 1719 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1720 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1721 return true; 1722 case CXXFunctionalCastExprClass: { 1723 if (getType()->isVoidType()) 1724 return false; 1725 const CastExpr *CE = cast<CastExpr>(this); 1726 1727 // If this is a cast to void or a constructor conversion, check the operand. 1728 // Otherwise, the result of the cast is unused. 1729 if (CE->getCastKind() == CK_ToVoid || 1730 CE->getCastKind() == CK_ConstructorConversion) 1731 return (cast<CastExpr>(this)->getSubExpr() 1732 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1733 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1734 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1735 return true; 1736 } 1737 1738 case ImplicitCastExprClass: 1739 // Check the operand, since implicit casts are inserted by Sema 1740 return (cast<ImplicitCastExpr>(this) 1741 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1742 1743 case CXXDefaultArgExprClass: 1744 return (cast<CXXDefaultArgExpr>(this) 1745 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1746 1747 case CXXNewExprClass: 1748 // FIXME: In theory, there might be new expressions that don't have side 1749 // effects (e.g. a placement new with an uninitialized POD). 1750 case CXXDeleteExprClass: 1751 return false; 1752 case CXXBindTemporaryExprClass: 1753 return (cast<CXXBindTemporaryExpr>(this) 1754 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1755 case ExprWithCleanupsClass: 1756 return (cast<ExprWithCleanups>(this) 1757 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1758 } 1759} 1760 1761/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1762/// returns true, if it is; false otherwise. 1763bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1764 const Expr *E = IgnoreParens(); 1765 switch (E->getStmtClass()) { 1766 default: 1767 return false; 1768 case ObjCIvarRefExprClass: 1769 return true; 1770 case Expr::UnaryOperatorClass: 1771 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1772 case ImplicitCastExprClass: 1773 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1774 case MaterializeTemporaryExprClass: 1775 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr() 1776 ->isOBJCGCCandidate(Ctx); 1777 case CStyleCastExprClass: 1778 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1779 case DeclRefExprClass: { 1780 const Decl *D = cast<DeclRefExpr>(E)->getDecl(); 1781 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1782 if (VD->hasGlobalStorage()) 1783 return true; 1784 QualType T = VD->getType(); 1785 // dereferencing to a pointer is always a gc'able candidate, 1786 // unless it is __weak. 1787 return T->isPointerType() && 1788 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1789 } 1790 return false; 1791 } 1792 case MemberExprClass: { 1793 const MemberExpr *M = cast<MemberExpr>(E); 1794 return M->getBase()->isOBJCGCCandidate(Ctx); 1795 } 1796 case ArraySubscriptExprClass: 1797 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx); 1798 } 1799} 1800 1801bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1802 if (isTypeDependent()) 1803 return false; 1804 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1805} 1806 1807QualType Expr::findBoundMemberType(const Expr *expr) { 1808 assert(expr->getType()->isSpecificPlaceholderType(BuiltinType::BoundMember)); 1809 1810 // Bound member expressions are always one of these possibilities: 1811 // x->m x.m x->*y x.*y 1812 // (possibly parenthesized) 1813 1814 expr = expr->IgnoreParens(); 1815 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) { 1816 assert(isa<CXXMethodDecl>(mem->getMemberDecl())); 1817 return mem->getMemberDecl()->getType(); 1818 } 1819 1820 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) { 1821 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>() 1822 ->getPointeeType(); 1823 assert(type->isFunctionType()); 1824 return type; 1825 } 1826 1827 assert(isa<UnresolvedMemberExpr>(expr)); 1828 return QualType(); 1829} 1830 1831static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1832 Expr::CanThrowResult CT2) { 1833 // CanThrowResult constants are ordered so that the maximum is the correct 1834 // merge result. 1835 return CT1 > CT2 ? CT1 : CT2; 1836} 1837 1838static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1839 Expr *E = const_cast<Expr*>(CE); 1840 Expr::CanThrowResult R = Expr::CT_Cannot; 1841 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1842 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1843 } 1844 return R; 1845} 1846 1847static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Expr *E, 1848 const Decl *D, 1849 bool NullThrows = true) { 1850 if (!D) 1851 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1852 1853 // See if we can get a function type from the decl somehow. 1854 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1855 if (!VD) // If we have no clue what we're calling, assume the worst. 1856 return Expr::CT_Can; 1857 1858 // As an extension, we assume that __attribute__((nothrow)) functions don't 1859 // throw. 1860 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1861 return Expr::CT_Cannot; 1862 1863 QualType T = VD->getType(); 1864 const FunctionProtoType *FT; 1865 if ((FT = T->getAs<FunctionProtoType>())) { 1866 } else if (const PointerType *PT = T->getAs<PointerType>()) 1867 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1868 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1869 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1870 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1871 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1872 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1873 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1874 1875 if (!FT) 1876 return Expr::CT_Can; 1877 1878 if (FT->getExceptionSpecType() == EST_Delayed) { 1879 assert(isa<CXXConstructorDecl>(D) && 1880 "only constructor exception specs can be unknown"); 1881 Ctx.getDiagnostics().Report(E->getLocStart(), 1882 diag::err_exception_spec_unknown) 1883 << E->getSourceRange(); 1884 return Expr::CT_Can; 1885 } 1886 1887 return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can; 1888} 1889 1890static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1891 if (DC->isTypeDependent()) 1892 return Expr::CT_Dependent; 1893 1894 if (!DC->getTypeAsWritten()->isReferenceType()) 1895 return Expr::CT_Cannot; 1896 1897 if (DC->getSubExpr()->isTypeDependent()) 1898 return Expr::CT_Dependent; 1899 1900 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1901} 1902 1903static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1904 const CXXTypeidExpr *DC) { 1905 if (DC->isTypeOperand()) 1906 return Expr::CT_Cannot; 1907 1908 Expr *Op = DC->getExprOperand(); 1909 if (Op->isTypeDependent()) 1910 return Expr::CT_Dependent; 1911 1912 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1913 if (!RT) 1914 return Expr::CT_Cannot; 1915 1916 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1917 return Expr::CT_Cannot; 1918 1919 if (Op->Classify(C).isPRValue()) 1920 return Expr::CT_Cannot; 1921 1922 return Expr::CT_Can; 1923} 1924 1925Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1926 // C++ [expr.unary.noexcept]p3: 1927 // [Can throw] if in a potentially-evaluated context the expression would 1928 // contain: 1929 switch (getStmtClass()) { 1930 case CXXThrowExprClass: 1931 // - a potentially evaluated throw-expression 1932 return CT_Can; 1933 1934 case CXXDynamicCastExprClass: { 1935 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1936 // where T is a reference type, that requires a run-time check 1937 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1938 if (CT == CT_Can) 1939 return CT; 1940 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1941 } 1942 1943 case CXXTypeidExprClass: 1944 // - a potentially evaluated typeid expression applied to a glvalue 1945 // expression whose type is a polymorphic class type 1946 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1947 1948 // - a potentially evaluated call to a function, member function, function 1949 // pointer, or member function pointer that does not have a non-throwing 1950 // exception-specification 1951 case CallExprClass: 1952 case CXXOperatorCallExprClass: 1953 case CXXMemberCallExprClass: { 1954 const CallExpr *CE = cast<CallExpr>(this); 1955 CanThrowResult CT; 1956 if (isTypeDependent()) 1957 CT = CT_Dependent; 1958 else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) 1959 CT = CT_Cannot; 1960 else 1961 CT = CanCalleeThrow(C, this, CE->getCalleeDecl()); 1962 if (CT == CT_Can) 1963 return CT; 1964 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1965 } 1966 1967 case CXXConstructExprClass: 1968 case CXXTemporaryObjectExprClass: { 1969 CanThrowResult CT = CanCalleeThrow(C, this, 1970 cast<CXXConstructExpr>(this)->getConstructor()); 1971 if (CT == CT_Can) 1972 return CT; 1973 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1974 } 1975 1976 case CXXNewExprClass: { 1977 CanThrowResult CT; 1978 if (isTypeDependent()) 1979 CT = CT_Dependent; 1980 else 1981 CT = MergeCanThrow( 1982 CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getOperatorNew()), 1983 CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getConstructor(), 1984 /*NullThrows*/false)); 1985 if (CT == CT_Can) 1986 return CT; 1987 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1988 } 1989 1990 case CXXDeleteExprClass: { 1991 CanThrowResult CT; 1992 QualType DTy = cast<CXXDeleteExpr>(this)->getDestroyedType(); 1993 if (DTy.isNull() || DTy->isDependentType()) { 1994 CT = CT_Dependent; 1995 } else { 1996 CT = CanCalleeThrow(C, this, 1997 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1998 if (const RecordType *RT = DTy->getAs<RecordType>()) { 1999 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2000 CT = MergeCanThrow(CT, CanCalleeThrow(C, this, RD->getDestructor())); 2001 } 2002 if (CT == CT_Can) 2003 return CT; 2004 } 2005 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2006 } 2007 2008 case CXXBindTemporaryExprClass: { 2009 // The bound temporary has to be destroyed again, which might throw. 2010 CanThrowResult CT = CanCalleeThrow(C, this, 2011 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 2012 if (CT == CT_Can) 2013 return CT; 2014 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2015 } 2016 2017 // ObjC message sends are like function calls, but never have exception 2018 // specs. 2019 case ObjCMessageExprClass: 2020 case ObjCPropertyRefExprClass: 2021 return CT_Can; 2022 2023 // Many other things have subexpressions, so we have to test those. 2024 // Some are simple: 2025 case ParenExprClass: 2026 case MemberExprClass: 2027 case CXXReinterpretCastExprClass: 2028 case CXXConstCastExprClass: 2029 case ConditionalOperatorClass: 2030 case CompoundLiteralExprClass: 2031 case ExtVectorElementExprClass: 2032 case InitListExprClass: 2033 case DesignatedInitExprClass: 2034 case ParenListExprClass: 2035 case VAArgExprClass: 2036 case CXXDefaultArgExprClass: 2037 case ExprWithCleanupsClass: 2038 case ObjCIvarRefExprClass: 2039 case ObjCIsaExprClass: 2040 case ShuffleVectorExprClass: 2041 return CanSubExprsThrow(C, this); 2042 2043 // Some might be dependent for other reasons. 2044 case UnaryOperatorClass: 2045 case ArraySubscriptExprClass: 2046 case ImplicitCastExprClass: 2047 case CStyleCastExprClass: 2048 case CXXStaticCastExprClass: 2049 case CXXFunctionalCastExprClass: 2050 case BinaryOperatorClass: 2051 case CompoundAssignOperatorClass: 2052 case MaterializeTemporaryExprClass: { 2053 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 2054 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2055 } 2056 2057 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 2058 case StmtExprClass: 2059 return CT_Can; 2060 2061 case ChooseExprClass: 2062 if (isTypeDependent() || isValueDependent()) 2063 return CT_Dependent; 2064 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 2065 2066 case GenericSelectionExprClass: 2067 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2068 return CT_Dependent; 2069 return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C); 2070 2071 // Some expressions are always dependent. 2072 case DependentScopeDeclRefExprClass: 2073 case CXXUnresolvedConstructExprClass: 2074 case CXXDependentScopeMemberExprClass: 2075 return CT_Dependent; 2076 2077 default: 2078 // All other expressions don't have subexpressions, or else they are 2079 // unevaluated. 2080 return CT_Cannot; 2081 } 2082} 2083 2084Expr* Expr::IgnoreParens() { 2085 Expr* E = this; 2086 while (true) { 2087 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2088 E = P->getSubExpr(); 2089 continue; 2090 } 2091 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2092 if (P->getOpcode() == UO_Extension) { 2093 E = P->getSubExpr(); 2094 continue; 2095 } 2096 } 2097 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2098 if (!P->isResultDependent()) { 2099 E = P->getResultExpr(); 2100 continue; 2101 } 2102 } 2103 return E; 2104 } 2105} 2106 2107/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 2108/// or CastExprs or ImplicitCastExprs, returning their operand. 2109Expr *Expr::IgnoreParenCasts() { 2110 Expr *E = this; 2111 while (true) { 2112 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2113 E = P->getSubExpr(); 2114 continue; 2115 } 2116 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2117 E = P->getSubExpr(); 2118 continue; 2119 } 2120 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2121 if (P->getOpcode() == UO_Extension) { 2122 E = P->getSubExpr(); 2123 continue; 2124 } 2125 } 2126 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2127 if (!P->isResultDependent()) { 2128 E = P->getResultExpr(); 2129 continue; 2130 } 2131 } 2132 if (MaterializeTemporaryExpr *Materialize 2133 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2134 E = Materialize->GetTemporaryExpr(); 2135 continue; 2136 } 2137 if (SubstNonTypeTemplateParmExpr *NTTP 2138 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2139 E = NTTP->getReplacement(); 2140 continue; 2141 } 2142 return E; 2143 } 2144} 2145 2146/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 2147/// casts. This is intended purely as a temporary workaround for code 2148/// that hasn't yet been rewritten to do the right thing about those 2149/// casts, and may disappear along with the last internal use. 2150Expr *Expr::IgnoreParenLValueCasts() { 2151 Expr *E = this; 2152 while (true) { 2153 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2154 E = P->getSubExpr(); 2155 continue; 2156 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2157 if (P->getCastKind() == CK_LValueToRValue) { 2158 E = P->getSubExpr(); 2159 continue; 2160 } 2161 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2162 if (P->getOpcode() == UO_Extension) { 2163 E = P->getSubExpr(); 2164 continue; 2165 } 2166 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2167 if (!P->isResultDependent()) { 2168 E = P->getResultExpr(); 2169 continue; 2170 } 2171 } else if (MaterializeTemporaryExpr *Materialize 2172 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2173 E = Materialize->GetTemporaryExpr(); 2174 continue; 2175 } else if (SubstNonTypeTemplateParmExpr *NTTP 2176 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2177 E = NTTP->getReplacement(); 2178 continue; 2179 } 2180 break; 2181 } 2182 return E; 2183} 2184 2185Expr *Expr::IgnoreParenImpCasts() { 2186 Expr *E = this; 2187 while (true) { 2188 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2189 E = P->getSubExpr(); 2190 continue; 2191 } 2192 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 2193 E = P->getSubExpr(); 2194 continue; 2195 } 2196 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2197 if (P->getOpcode() == UO_Extension) { 2198 E = P->getSubExpr(); 2199 continue; 2200 } 2201 } 2202 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2203 if (!P->isResultDependent()) { 2204 E = P->getResultExpr(); 2205 continue; 2206 } 2207 } 2208 if (MaterializeTemporaryExpr *Materialize 2209 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2210 E = Materialize->GetTemporaryExpr(); 2211 continue; 2212 } 2213 if (SubstNonTypeTemplateParmExpr *NTTP 2214 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2215 E = NTTP->getReplacement(); 2216 continue; 2217 } 2218 return E; 2219 } 2220} 2221 2222Expr *Expr::IgnoreConversionOperator() { 2223 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) { 2224 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl())) 2225 return MCE->getImplicitObjectArgument(); 2226 } 2227 return this; 2228} 2229 2230/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 2231/// value (including ptr->int casts of the same size). Strip off any 2232/// ParenExpr or CastExprs, returning their operand. 2233Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 2234 Expr *E = this; 2235 while (true) { 2236 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2237 E = P->getSubExpr(); 2238 continue; 2239 } 2240 2241 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2242 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 2243 // ptr<->int casts of the same width. We also ignore all identity casts. 2244 Expr *SE = P->getSubExpr(); 2245 2246 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 2247 E = SE; 2248 continue; 2249 } 2250 2251 if ((E->getType()->isPointerType() || 2252 E->getType()->isIntegralType(Ctx)) && 2253 (SE->getType()->isPointerType() || 2254 SE->getType()->isIntegralType(Ctx)) && 2255 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 2256 E = SE; 2257 continue; 2258 } 2259 } 2260 2261 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2262 if (P->getOpcode() == UO_Extension) { 2263 E = P->getSubExpr(); 2264 continue; 2265 } 2266 } 2267 2268 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2269 if (!P->isResultDependent()) { 2270 E = P->getResultExpr(); 2271 continue; 2272 } 2273 } 2274 2275 if (SubstNonTypeTemplateParmExpr *NTTP 2276 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2277 E = NTTP->getReplacement(); 2278 continue; 2279 } 2280 2281 return E; 2282 } 2283} 2284 2285bool Expr::isDefaultArgument() const { 2286 const Expr *E = this; 2287 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2288 E = M->GetTemporaryExpr(); 2289 2290 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 2291 E = ICE->getSubExprAsWritten(); 2292 2293 return isa<CXXDefaultArgExpr>(E); 2294} 2295 2296/// \brief Skip over any no-op casts and any temporary-binding 2297/// expressions. 2298static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 2299 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2300 E = M->GetTemporaryExpr(); 2301 2302 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2303 if (ICE->getCastKind() == CK_NoOp) 2304 E = ICE->getSubExpr(); 2305 else 2306 break; 2307 } 2308 2309 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2310 E = BE->getSubExpr(); 2311 2312 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2313 if (ICE->getCastKind() == CK_NoOp) 2314 E = ICE->getSubExpr(); 2315 else 2316 break; 2317 } 2318 2319 return E->IgnoreParens(); 2320} 2321 2322/// isTemporaryObject - Determines if this expression produces a 2323/// temporary of the given class type. 2324bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2325 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2326 return false; 2327 2328 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2329 2330 // Temporaries are by definition pr-values of class type. 2331 if (!E->Classify(C).isPRValue()) { 2332 // In this context, property reference is a message call and is pr-value. 2333 if (!isa<ObjCPropertyRefExpr>(E)) 2334 return false; 2335 } 2336 2337 // Black-list a few cases which yield pr-values of class type that don't 2338 // refer to temporaries of that type: 2339 2340 // - implicit derived-to-base conversions 2341 if (isa<ImplicitCastExpr>(E)) { 2342 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2343 case CK_DerivedToBase: 2344 case CK_UncheckedDerivedToBase: 2345 return false; 2346 default: 2347 break; 2348 } 2349 } 2350 2351 // - member expressions (all) 2352 if (isa<MemberExpr>(E)) 2353 return false; 2354 2355 // - opaque values (all) 2356 if (isa<OpaqueValueExpr>(E)) 2357 return false; 2358 2359 return true; 2360} 2361 2362bool Expr::isImplicitCXXThis() const { 2363 const Expr *E = this; 2364 2365 // Strip away parentheses and casts we don't care about. 2366 while (true) { 2367 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2368 E = Paren->getSubExpr(); 2369 continue; 2370 } 2371 2372 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2373 if (ICE->getCastKind() == CK_NoOp || 2374 ICE->getCastKind() == CK_LValueToRValue || 2375 ICE->getCastKind() == CK_DerivedToBase || 2376 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2377 E = ICE->getSubExpr(); 2378 continue; 2379 } 2380 } 2381 2382 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2383 if (UnOp->getOpcode() == UO_Extension) { 2384 E = UnOp->getSubExpr(); 2385 continue; 2386 } 2387 } 2388 2389 if (const MaterializeTemporaryExpr *M 2390 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2391 E = M->GetTemporaryExpr(); 2392 continue; 2393 } 2394 2395 break; 2396 } 2397 2398 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2399 return This->isImplicit(); 2400 2401 return false; 2402} 2403 2404/// hasAnyTypeDependentArguments - Determines if any of the expressions 2405/// in Exprs is type-dependent. 2406bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 2407 for (unsigned I = 0; I < NumExprs; ++I) 2408 if (Exprs[I]->isTypeDependent()) 2409 return true; 2410 2411 return false; 2412} 2413 2414/// hasAnyValueDependentArguments - Determines if any of the expressions 2415/// in Exprs is value-dependent. 2416bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 2417 for (unsigned I = 0; I < NumExprs; ++I) 2418 if (Exprs[I]->isValueDependent()) 2419 return true; 2420 2421 return false; 2422} 2423 2424bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2425 // This function is attempting whether an expression is an initializer 2426 // which can be evaluated at compile-time. isEvaluatable handles most 2427 // of the cases, but it can't deal with some initializer-specific 2428 // expressions, and it can't deal with aggregates; we deal with those here, 2429 // and fall back to isEvaluatable for the other cases. 2430 2431 // If we ever capture reference-binding directly in the AST, we can 2432 // kill the second parameter. 2433 2434 if (IsForRef) { 2435 EvalResult Result; 2436 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2437 } 2438 2439 switch (getStmtClass()) { 2440 default: break; 2441 case StringLiteralClass: 2442 case ObjCStringLiteralClass: 2443 case ObjCEncodeExprClass: 2444 return true; 2445 case CXXTemporaryObjectExprClass: 2446 case CXXConstructExprClass: { 2447 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2448 2449 // Only if it's 2450 // 1) an application of the trivial default constructor or 2451 if (!CE->getConstructor()->isTrivial()) return false; 2452 if (!CE->getNumArgs()) return true; 2453 2454 // 2) an elidable trivial copy construction of an operand which is 2455 // itself a constant initializer. Note that we consider the 2456 // operand on its own, *not* as a reference binding. 2457 return CE->isElidable() && 2458 CE->getArg(0)->isConstantInitializer(Ctx, false); 2459 } 2460 case CompoundLiteralExprClass: { 2461 // This handles gcc's extension that allows global initializers like 2462 // "struct x {int x;} x = (struct x) {};". 2463 // FIXME: This accepts other cases it shouldn't! 2464 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2465 return Exp->isConstantInitializer(Ctx, false); 2466 } 2467 case InitListExprClass: { 2468 // FIXME: This doesn't deal with fields with reference types correctly. 2469 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2470 // to bitfields. 2471 const InitListExpr *Exp = cast<InitListExpr>(this); 2472 unsigned numInits = Exp->getNumInits(); 2473 for (unsigned i = 0; i < numInits; i++) { 2474 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2475 return false; 2476 } 2477 return true; 2478 } 2479 case ImplicitValueInitExprClass: 2480 return true; 2481 case ParenExprClass: 2482 return cast<ParenExpr>(this)->getSubExpr() 2483 ->isConstantInitializer(Ctx, IsForRef); 2484 case GenericSelectionExprClass: 2485 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2486 return false; 2487 return cast<GenericSelectionExpr>(this)->getResultExpr() 2488 ->isConstantInitializer(Ctx, IsForRef); 2489 case ChooseExprClass: 2490 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2491 ->isConstantInitializer(Ctx, IsForRef); 2492 case UnaryOperatorClass: { 2493 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2494 if (Exp->getOpcode() == UO_Extension) 2495 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2496 break; 2497 } 2498 case BinaryOperatorClass: { 2499 // Special case &&foo - &&bar. It would be nice to generalize this somehow 2500 // but this handles the common case. 2501 const BinaryOperator *Exp = cast<BinaryOperator>(this); 2502 if (Exp->getOpcode() == BO_Sub && 2503 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 2504 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 2505 return true; 2506 break; 2507 } 2508 case CXXFunctionalCastExprClass: 2509 case CXXStaticCastExprClass: 2510 case ImplicitCastExprClass: 2511 case CStyleCastExprClass: 2512 // Handle casts with a destination that's a struct or union; this 2513 // deals with both the gcc no-op struct cast extension and the 2514 // cast-to-union extension. 2515 if (getType()->isRecordType()) 2516 return cast<CastExpr>(this)->getSubExpr() 2517 ->isConstantInitializer(Ctx, false); 2518 2519 // Integer->integer casts can be handled here, which is important for 2520 // things like (int)(&&x-&&y). Scary but true. 2521 if (getType()->isIntegerType() && 2522 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 2523 return cast<CastExpr>(this)->getSubExpr() 2524 ->isConstantInitializer(Ctx, false); 2525 2526 break; 2527 2528 case MaterializeTemporaryExprClass: 2529 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr() 2530 ->isConstantInitializer(Ctx, false); 2531 } 2532 return isEvaluatable(Ctx); 2533} 2534 2535/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2536/// pointer constant or not, as well as the specific kind of constant detected. 2537/// Null pointer constants can be integer constant expressions with the 2538/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2539/// (a GNU extension). 2540Expr::NullPointerConstantKind 2541Expr::isNullPointerConstant(ASTContext &Ctx, 2542 NullPointerConstantValueDependence NPC) const { 2543 if (isValueDependent()) { 2544 switch (NPC) { 2545 case NPC_NeverValueDependent: 2546 assert(false && "Unexpected value dependent expression!"); 2547 // If the unthinkable happens, fall through to the safest alternative. 2548 2549 case NPC_ValueDependentIsNull: 2550 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2551 return NPCK_ZeroInteger; 2552 else 2553 return NPCK_NotNull; 2554 2555 case NPC_ValueDependentIsNotNull: 2556 return NPCK_NotNull; 2557 } 2558 } 2559 2560 // Strip off a cast to void*, if it exists. Except in C++. 2561 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2562 if (!Ctx.getLangOptions().CPlusPlus) { 2563 // Check that it is a cast to void*. 2564 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2565 QualType Pointee = PT->getPointeeType(); 2566 if (!Pointee.hasQualifiers() && 2567 Pointee->isVoidType() && // to void* 2568 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2569 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2570 } 2571 } 2572 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2573 // Ignore the ImplicitCastExpr type entirely. 2574 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2575 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2576 // Accept ((void*)0) as a null pointer constant, as many other 2577 // implementations do. 2578 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2579 } else if (const GenericSelectionExpr *GE = 2580 dyn_cast<GenericSelectionExpr>(this)) { 2581 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC); 2582 } else if (const CXXDefaultArgExpr *DefaultArg 2583 = dyn_cast<CXXDefaultArgExpr>(this)) { 2584 // See through default argument expressions 2585 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2586 } else if (isa<GNUNullExpr>(this)) { 2587 // The GNU __null extension is always a null pointer constant. 2588 return NPCK_GNUNull; 2589 } else if (const MaterializeTemporaryExpr *M 2590 = dyn_cast<MaterializeTemporaryExpr>(this)) { 2591 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC); 2592 } 2593 2594 // C++0x nullptr_t is always a null pointer constant. 2595 if (getType()->isNullPtrType()) 2596 return NPCK_CXX0X_nullptr; 2597 2598 if (const RecordType *UT = getType()->getAsUnionType()) 2599 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2600 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2601 const Expr *InitExpr = CLE->getInitializer(); 2602 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2603 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2604 } 2605 // This expression must be an integer type. 2606 if (!getType()->isIntegerType() || 2607 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2608 return NPCK_NotNull; 2609 2610 // If we have an integer constant expression, we need to *evaluate* it and 2611 // test for the value 0. 2612 llvm::APSInt Result; 2613 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0; 2614 2615 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull); 2616} 2617 2618/// \brief If this expression is an l-value for an Objective C 2619/// property, find the underlying property reference expression. 2620const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2621 const Expr *E = this; 2622 while (true) { 2623 assert((E->getValueKind() == VK_LValue && 2624 E->getObjectKind() == OK_ObjCProperty) && 2625 "expression is not a property reference"); 2626 E = E->IgnoreParenCasts(); 2627 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2628 if (BO->getOpcode() == BO_Comma) { 2629 E = BO->getRHS(); 2630 continue; 2631 } 2632 } 2633 2634 break; 2635 } 2636 2637 return cast<ObjCPropertyRefExpr>(E); 2638} 2639 2640FieldDecl *Expr::getBitField() { 2641 Expr *E = this->IgnoreParens(); 2642 2643 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2644 if (ICE->getCastKind() == CK_LValueToRValue || 2645 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2646 E = ICE->getSubExpr()->IgnoreParens(); 2647 else 2648 break; 2649 } 2650 2651 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2652 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2653 if (Field->isBitField()) 2654 return Field; 2655 2656 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2657 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2658 if (Field->isBitField()) 2659 return Field; 2660 2661 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) { 2662 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2663 return BinOp->getLHS()->getBitField(); 2664 2665 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS()) 2666 return BinOp->getRHS()->getBitField(); 2667 } 2668 2669 return 0; 2670} 2671 2672bool Expr::refersToVectorElement() const { 2673 const Expr *E = this->IgnoreParens(); 2674 2675 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2676 if (ICE->getValueKind() != VK_RValue && 2677 ICE->getCastKind() == CK_NoOp) 2678 E = ICE->getSubExpr()->IgnoreParens(); 2679 else 2680 break; 2681 } 2682 2683 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2684 return ASE->getBase()->getType()->isVectorType(); 2685 2686 if (isa<ExtVectorElementExpr>(E)) 2687 return true; 2688 2689 return false; 2690} 2691 2692/// isArrow - Return true if the base expression is a pointer to vector, 2693/// return false if the base expression is a vector. 2694bool ExtVectorElementExpr::isArrow() const { 2695 return getBase()->getType()->isPointerType(); 2696} 2697 2698unsigned ExtVectorElementExpr::getNumElements() const { 2699 if (const VectorType *VT = getType()->getAs<VectorType>()) 2700 return VT->getNumElements(); 2701 return 1; 2702} 2703 2704/// containsDuplicateElements - Return true if any element access is repeated. 2705bool ExtVectorElementExpr::containsDuplicateElements() const { 2706 // FIXME: Refactor this code to an accessor on the AST node which returns the 2707 // "type" of component access, and share with code below and in Sema. 2708 StringRef Comp = Accessor->getName(); 2709 2710 // Halving swizzles do not contain duplicate elements. 2711 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2712 return false; 2713 2714 // Advance past s-char prefix on hex swizzles. 2715 if (Comp[0] == 's' || Comp[0] == 'S') 2716 Comp = Comp.substr(1); 2717 2718 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2719 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos) 2720 return true; 2721 2722 return false; 2723} 2724 2725/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2726void ExtVectorElementExpr::getEncodedElementAccess( 2727 SmallVectorImpl<unsigned> &Elts) const { 2728 StringRef Comp = Accessor->getName(); 2729 if (Comp[0] == 's' || Comp[0] == 'S') 2730 Comp = Comp.substr(1); 2731 2732 bool isHi = Comp == "hi"; 2733 bool isLo = Comp == "lo"; 2734 bool isEven = Comp == "even"; 2735 bool isOdd = Comp == "odd"; 2736 2737 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2738 uint64_t Index; 2739 2740 if (isHi) 2741 Index = e + i; 2742 else if (isLo) 2743 Index = i; 2744 else if (isEven) 2745 Index = 2 * i; 2746 else if (isOdd) 2747 Index = 2 * i + 1; 2748 else 2749 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2750 2751 Elts.push_back(Index); 2752 } 2753} 2754 2755ObjCMessageExpr::ObjCMessageExpr(QualType T, 2756 ExprValueKind VK, 2757 SourceLocation LBracLoc, 2758 SourceLocation SuperLoc, 2759 bool IsInstanceSuper, 2760 QualType SuperType, 2761 Selector Sel, 2762 SourceLocation SelLoc, 2763 ObjCMethodDecl *Method, 2764 Expr **Args, unsigned NumArgs, 2765 SourceLocation RBracLoc) 2766 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2767 /*TypeDependent=*/false, /*ValueDependent=*/false, 2768 /*InstantiationDependent=*/false, 2769 /*ContainsUnexpandedParameterPack=*/false), 2770 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2771 HasMethod(Method != 0), IsDelegateInitCall(false), SuperLoc(SuperLoc), 2772 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2773 : Sel.getAsOpaquePtr())), 2774 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2775{ 2776 setReceiverPointer(SuperType.getAsOpaquePtr()); 2777 if (NumArgs) 2778 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2779} 2780 2781ObjCMessageExpr::ObjCMessageExpr(QualType T, 2782 ExprValueKind VK, 2783 SourceLocation LBracLoc, 2784 TypeSourceInfo *Receiver, 2785 Selector Sel, 2786 SourceLocation SelLoc, 2787 ObjCMethodDecl *Method, 2788 Expr **Args, unsigned NumArgs, 2789 SourceLocation RBracLoc) 2790 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2791 T->isDependentType(), T->isInstantiationDependentType(), 2792 T->containsUnexpandedParameterPack()), 2793 NumArgs(NumArgs), Kind(Class), 2794 HasMethod(Method != 0), IsDelegateInitCall(false), 2795 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2796 : Sel.getAsOpaquePtr())), 2797 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2798{ 2799 setReceiverPointer(Receiver); 2800 Expr **MyArgs = getArgs(); 2801 for (unsigned I = 0; I != NumArgs; ++I) { 2802 if (Args[I]->isTypeDependent()) 2803 ExprBits.TypeDependent = true; 2804 if (Args[I]->isValueDependent()) 2805 ExprBits.ValueDependent = true; 2806 if (Args[I]->isInstantiationDependent()) 2807 ExprBits.InstantiationDependent = true; 2808 if (Args[I]->containsUnexpandedParameterPack()) 2809 ExprBits.ContainsUnexpandedParameterPack = true; 2810 2811 MyArgs[I] = Args[I]; 2812 } 2813} 2814 2815ObjCMessageExpr::ObjCMessageExpr(QualType T, 2816 ExprValueKind VK, 2817 SourceLocation LBracLoc, 2818 Expr *Receiver, 2819 Selector Sel, 2820 SourceLocation SelLoc, 2821 ObjCMethodDecl *Method, 2822 Expr **Args, unsigned NumArgs, 2823 SourceLocation RBracLoc) 2824 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2825 Receiver->isTypeDependent(), 2826 Receiver->isInstantiationDependent(), 2827 Receiver->containsUnexpandedParameterPack()), 2828 NumArgs(NumArgs), Kind(Instance), 2829 HasMethod(Method != 0), IsDelegateInitCall(false), 2830 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2831 : Sel.getAsOpaquePtr())), 2832 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2833{ 2834 setReceiverPointer(Receiver); 2835 Expr **MyArgs = getArgs(); 2836 for (unsigned I = 0; I != NumArgs; ++I) { 2837 if (Args[I]->isTypeDependent()) 2838 ExprBits.TypeDependent = true; 2839 if (Args[I]->isValueDependent()) 2840 ExprBits.ValueDependent = true; 2841 if (Args[I]->isInstantiationDependent()) 2842 ExprBits.InstantiationDependent = true; 2843 if (Args[I]->containsUnexpandedParameterPack()) 2844 ExprBits.ContainsUnexpandedParameterPack = true; 2845 2846 MyArgs[I] = Args[I]; 2847 } 2848} 2849 2850ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2851 ExprValueKind VK, 2852 SourceLocation LBracLoc, 2853 SourceLocation SuperLoc, 2854 bool IsInstanceSuper, 2855 QualType SuperType, 2856 Selector Sel, 2857 SourceLocation SelLoc, 2858 ObjCMethodDecl *Method, 2859 Expr **Args, unsigned NumArgs, 2860 SourceLocation RBracLoc) { 2861 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2862 NumArgs * sizeof(Expr *); 2863 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2864 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2865 SuperType, Sel, SelLoc, Method, Args,NumArgs, 2866 RBracLoc); 2867} 2868 2869ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2870 ExprValueKind VK, 2871 SourceLocation LBracLoc, 2872 TypeSourceInfo *Receiver, 2873 Selector Sel, 2874 SourceLocation SelLoc, 2875 ObjCMethodDecl *Method, 2876 Expr **Args, unsigned NumArgs, 2877 SourceLocation RBracLoc) { 2878 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2879 NumArgs * sizeof(Expr *); 2880 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2881 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2882 Method, Args, NumArgs, RBracLoc); 2883} 2884 2885ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2886 ExprValueKind VK, 2887 SourceLocation LBracLoc, 2888 Expr *Receiver, 2889 Selector Sel, 2890 SourceLocation SelLoc, 2891 ObjCMethodDecl *Method, 2892 Expr **Args, unsigned NumArgs, 2893 SourceLocation RBracLoc) { 2894 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2895 NumArgs * sizeof(Expr *); 2896 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2897 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc, 2898 Method, Args, NumArgs, RBracLoc); 2899} 2900 2901ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2902 unsigned NumArgs) { 2903 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2904 NumArgs * sizeof(Expr *); 2905 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2906 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2907} 2908 2909SourceRange ObjCMessageExpr::getReceiverRange() const { 2910 switch (getReceiverKind()) { 2911 case Instance: 2912 return getInstanceReceiver()->getSourceRange(); 2913 2914 case Class: 2915 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 2916 2917 case SuperInstance: 2918 case SuperClass: 2919 return getSuperLoc(); 2920 } 2921 2922 return SourceLocation(); 2923} 2924 2925Selector ObjCMessageExpr::getSelector() const { 2926 if (HasMethod) 2927 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2928 ->getSelector(); 2929 return Selector(SelectorOrMethod); 2930} 2931 2932ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2933 switch (getReceiverKind()) { 2934 case Instance: 2935 if (const ObjCObjectPointerType *Ptr 2936 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2937 return Ptr->getInterfaceDecl(); 2938 break; 2939 2940 case Class: 2941 if (const ObjCObjectType *Ty 2942 = getClassReceiver()->getAs<ObjCObjectType>()) 2943 return Ty->getInterface(); 2944 break; 2945 2946 case SuperInstance: 2947 if (const ObjCObjectPointerType *Ptr 2948 = getSuperType()->getAs<ObjCObjectPointerType>()) 2949 return Ptr->getInterfaceDecl(); 2950 break; 2951 2952 case SuperClass: 2953 if (const ObjCObjectType *Iface 2954 = getSuperType()->getAs<ObjCObjectType>()) 2955 return Iface->getInterface(); 2956 break; 2957 } 2958 2959 return 0; 2960} 2961 2962StringRef ObjCBridgedCastExpr::getBridgeKindName() const { 2963 switch (getBridgeKind()) { 2964 case OBC_Bridge: 2965 return "__bridge"; 2966 case OBC_BridgeTransfer: 2967 return "__bridge_transfer"; 2968 case OBC_BridgeRetained: 2969 return "__bridge_retained"; 2970 } 2971 2972 return "__bridge"; 2973} 2974 2975bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 2976 return getCond()->EvaluateAsInt(C) != 0; 2977} 2978 2979ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2980 QualType Type, SourceLocation BLoc, 2981 SourceLocation RP) 2982 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 2983 Type->isDependentType(), Type->isDependentType(), 2984 Type->isInstantiationDependentType(), 2985 Type->containsUnexpandedParameterPack()), 2986 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 2987{ 2988 SubExprs = new (C) Stmt*[nexpr]; 2989 for (unsigned i = 0; i < nexpr; i++) { 2990 if (args[i]->isTypeDependent()) 2991 ExprBits.TypeDependent = true; 2992 if (args[i]->isValueDependent()) 2993 ExprBits.ValueDependent = true; 2994 if (args[i]->isInstantiationDependent()) 2995 ExprBits.InstantiationDependent = true; 2996 if (args[i]->containsUnexpandedParameterPack()) 2997 ExprBits.ContainsUnexpandedParameterPack = true; 2998 2999 SubExprs[i] = args[i]; 3000 } 3001} 3002 3003void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 3004 unsigned NumExprs) { 3005 if (SubExprs) C.Deallocate(SubExprs); 3006 3007 SubExprs = new (C) Stmt* [NumExprs]; 3008 this->NumExprs = NumExprs; 3009 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 3010} 3011 3012GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3013 SourceLocation GenericLoc, Expr *ControllingExpr, 3014 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3015 unsigned NumAssocs, SourceLocation DefaultLoc, 3016 SourceLocation RParenLoc, 3017 bool ContainsUnexpandedParameterPack, 3018 unsigned ResultIndex) 3019 : Expr(GenericSelectionExprClass, 3020 AssocExprs[ResultIndex]->getType(), 3021 AssocExprs[ResultIndex]->getValueKind(), 3022 AssocExprs[ResultIndex]->getObjectKind(), 3023 AssocExprs[ResultIndex]->isTypeDependent(), 3024 AssocExprs[ResultIndex]->isValueDependent(), 3025 AssocExprs[ResultIndex]->isInstantiationDependent(), 3026 ContainsUnexpandedParameterPack), 3027 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3028 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3029 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3030 RParenLoc(RParenLoc) { 3031 SubExprs[CONTROLLING] = ControllingExpr; 3032 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3033 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3034} 3035 3036GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3037 SourceLocation GenericLoc, Expr *ControllingExpr, 3038 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3039 unsigned NumAssocs, SourceLocation DefaultLoc, 3040 SourceLocation RParenLoc, 3041 bool ContainsUnexpandedParameterPack) 3042 : Expr(GenericSelectionExprClass, 3043 Context.DependentTy, 3044 VK_RValue, 3045 OK_Ordinary, 3046 /*isTypeDependent=*/true, 3047 /*isValueDependent=*/true, 3048 /*isInstantiationDependent=*/true, 3049 ContainsUnexpandedParameterPack), 3050 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3051 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3052 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3053 RParenLoc(RParenLoc) { 3054 SubExprs[CONTROLLING] = ControllingExpr; 3055 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3056 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3057} 3058 3059//===----------------------------------------------------------------------===// 3060// DesignatedInitExpr 3061//===----------------------------------------------------------------------===// 3062 3063IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const { 3064 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3065 if (Field.NameOrField & 0x01) 3066 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 3067 else 3068 return getField()->getIdentifier(); 3069} 3070 3071DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 3072 unsigned NumDesignators, 3073 const Designator *Designators, 3074 SourceLocation EqualOrColonLoc, 3075 bool GNUSyntax, 3076 Expr **IndexExprs, 3077 unsigned NumIndexExprs, 3078 Expr *Init) 3079 : Expr(DesignatedInitExprClass, Ty, 3080 Init->getValueKind(), Init->getObjectKind(), 3081 Init->isTypeDependent(), Init->isValueDependent(), 3082 Init->isInstantiationDependent(), 3083 Init->containsUnexpandedParameterPack()), 3084 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 3085 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 3086 this->Designators = new (C) Designator[NumDesignators]; 3087 3088 // Record the initializer itself. 3089 child_range Child = children(); 3090 *Child++ = Init; 3091 3092 // Copy the designators and their subexpressions, computing 3093 // value-dependence along the way. 3094 unsigned IndexIdx = 0; 3095 for (unsigned I = 0; I != NumDesignators; ++I) { 3096 this->Designators[I] = Designators[I]; 3097 3098 if (this->Designators[I].isArrayDesignator()) { 3099 // Compute type- and value-dependence. 3100 Expr *Index = IndexExprs[IndexIdx]; 3101 if (Index->isTypeDependent() || Index->isValueDependent()) 3102 ExprBits.ValueDependent = true; 3103 if (Index->isInstantiationDependent()) 3104 ExprBits.InstantiationDependent = true; 3105 // Propagate unexpanded parameter packs. 3106 if (Index->containsUnexpandedParameterPack()) 3107 ExprBits.ContainsUnexpandedParameterPack = true; 3108 3109 // Copy the index expressions into permanent storage. 3110 *Child++ = IndexExprs[IndexIdx++]; 3111 } else if (this->Designators[I].isArrayRangeDesignator()) { 3112 // Compute type- and value-dependence. 3113 Expr *Start = IndexExprs[IndexIdx]; 3114 Expr *End = IndexExprs[IndexIdx + 1]; 3115 if (Start->isTypeDependent() || Start->isValueDependent() || 3116 End->isTypeDependent() || End->isValueDependent()) { 3117 ExprBits.ValueDependent = true; 3118 ExprBits.InstantiationDependent = true; 3119 } else if (Start->isInstantiationDependent() || 3120 End->isInstantiationDependent()) { 3121 ExprBits.InstantiationDependent = true; 3122 } 3123 3124 // Propagate unexpanded parameter packs. 3125 if (Start->containsUnexpandedParameterPack() || 3126 End->containsUnexpandedParameterPack()) 3127 ExprBits.ContainsUnexpandedParameterPack = true; 3128 3129 // Copy the start/end expressions into permanent storage. 3130 *Child++ = IndexExprs[IndexIdx++]; 3131 *Child++ = IndexExprs[IndexIdx++]; 3132 } 3133 } 3134 3135 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 3136} 3137 3138DesignatedInitExpr * 3139DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 3140 unsigned NumDesignators, 3141 Expr **IndexExprs, unsigned NumIndexExprs, 3142 SourceLocation ColonOrEqualLoc, 3143 bool UsesColonSyntax, Expr *Init) { 3144 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3145 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3146 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 3147 ColonOrEqualLoc, UsesColonSyntax, 3148 IndexExprs, NumIndexExprs, Init); 3149} 3150 3151DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 3152 unsigned NumIndexExprs) { 3153 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3154 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3155 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 3156} 3157 3158void DesignatedInitExpr::setDesignators(ASTContext &C, 3159 const Designator *Desigs, 3160 unsigned NumDesigs) { 3161 Designators = new (C) Designator[NumDesigs]; 3162 NumDesignators = NumDesigs; 3163 for (unsigned I = 0; I != NumDesigs; ++I) 3164 Designators[I] = Desigs[I]; 3165} 3166 3167SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { 3168 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this); 3169 if (size() == 1) 3170 return DIE->getDesignator(0)->getSourceRange(); 3171 return SourceRange(DIE->getDesignator(0)->getStartLocation(), 3172 DIE->getDesignator(size()-1)->getEndLocation()); 3173} 3174 3175SourceRange DesignatedInitExpr::getSourceRange() const { 3176 SourceLocation StartLoc; 3177 Designator &First = 3178 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 3179 if (First.isFieldDesignator()) { 3180 if (GNUSyntax) 3181 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 3182 else 3183 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 3184 } else 3185 StartLoc = 3186 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 3187 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 3188} 3189 3190Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 3191 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 3192 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3193 Ptr += sizeof(DesignatedInitExpr); 3194 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3195 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3196} 3197 3198Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 3199 assert(D.Kind == Designator::ArrayRangeDesignator && 3200 "Requires array range designator"); 3201 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3202 Ptr += sizeof(DesignatedInitExpr); 3203 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3204 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3205} 3206 3207Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 3208 assert(D.Kind == Designator::ArrayRangeDesignator && 3209 "Requires array range designator"); 3210 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3211 Ptr += sizeof(DesignatedInitExpr); 3212 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3213 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 3214} 3215 3216/// \brief Replaces the designator at index @p Idx with the series 3217/// of designators in [First, Last). 3218void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 3219 const Designator *First, 3220 const Designator *Last) { 3221 unsigned NumNewDesignators = Last - First; 3222 if (NumNewDesignators == 0) { 3223 std::copy_backward(Designators + Idx + 1, 3224 Designators + NumDesignators, 3225 Designators + Idx); 3226 --NumNewDesignators; 3227 return; 3228 } else if (NumNewDesignators == 1) { 3229 Designators[Idx] = *First; 3230 return; 3231 } 3232 3233 Designator *NewDesignators 3234 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 3235 std::copy(Designators, Designators + Idx, NewDesignators); 3236 std::copy(First, Last, NewDesignators + Idx); 3237 std::copy(Designators + Idx + 1, Designators + NumDesignators, 3238 NewDesignators + Idx + NumNewDesignators); 3239 Designators = NewDesignators; 3240 NumDesignators = NumDesignators - 1 + NumNewDesignators; 3241} 3242 3243ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 3244 Expr **exprs, unsigned nexprs, 3245 SourceLocation rparenloc, QualType T) 3246 : Expr(ParenListExprClass, T, VK_RValue, OK_Ordinary, 3247 false, false, false, false), 3248 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 3249 assert(!T.isNull() && "ParenListExpr must have a valid type"); 3250 Exprs = new (C) Stmt*[nexprs]; 3251 for (unsigned i = 0; i != nexprs; ++i) { 3252 if (exprs[i]->isTypeDependent()) 3253 ExprBits.TypeDependent = true; 3254 if (exprs[i]->isValueDependent()) 3255 ExprBits.ValueDependent = true; 3256 if (exprs[i]->isInstantiationDependent()) 3257 ExprBits.InstantiationDependent = true; 3258 if (exprs[i]->containsUnexpandedParameterPack()) 3259 ExprBits.ContainsUnexpandedParameterPack = true; 3260 3261 Exprs[i] = exprs[i]; 3262 } 3263} 3264 3265const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 3266 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 3267 e = ewc->getSubExpr(); 3268 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e)) 3269 e = m->GetTemporaryExpr(); 3270 e = cast<CXXConstructExpr>(e)->getArg(0); 3271 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3272 e = ice->getSubExpr(); 3273 return cast<OpaqueValueExpr>(e); 3274} 3275 3276//===----------------------------------------------------------------------===// 3277// ExprIterator. 3278//===----------------------------------------------------------------------===// 3279 3280Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 3281Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 3282Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 3283const Expr* ConstExprIterator::operator[](size_t idx) const { 3284 return cast<Expr>(I[idx]); 3285} 3286const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 3287const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 3288 3289//===----------------------------------------------------------------------===// 3290// Child Iterators for iterating over subexpressions/substatements 3291//===----------------------------------------------------------------------===// 3292 3293// UnaryExprOrTypeTraitExpr 3294Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 3295 // If this is of a type and the type is a VLA type (and not a typedef), the 3296 // size expression of the VLA needs to be treated as an executable expression. 3297 // Why isn't this weirdness documented better in StmtIterator? 3298 if (isArgumentType()) { 3299 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 3300 getArgumentType().getTypePtr())) 3301 return child_range(child_iterator(T), child_iterator()); 3302 return child_range(); 3303 } 3304 return child_range(&Argument.Ex, &Argument.Ex + 1); 3305} 3306 3307// ObjCMessageExpr 3308Stmt::child_range ObjCMessageExpr::children() { 3309 Stmt **begin; 3310 if (getReceiverKind() == Instance) 3311 begin = reinterpret_cast<Stmt **>(this + 1); 3312 else 3313 begin = reinterpret_cast<Stmt **>(getArgs()); 3314 return child_range(begin, 3315 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 3316} 3317 3318// Blocks 3319BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3320 SourceLocation l, bool ByRef, 3321 bool constAdded) 3322 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, false, 3323 d->isParameterPack()), 3324 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 3325{ 3326 bool TypeDependent = false; 3327 bool ValueDependent = false; 3328 bool InstantiationDependent = false; 3329 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent, 3330 InstantiationDependent); 3331 ExprBits.TypeDependent = TypeDependent; 3332 ExprBits.ValueDependent = ValueDependent; 3333 ExprBits.InstantiationDependent = InstantiationDependent; 3334} 3335