Expr.cpp revision 90e25a8b2cc5d006e4ced052bcdb40c8af999456
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/EvaluatedExprVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/Lex/LiteralSupport.h" 25#include "clang/Lex/Lexer.h" 26#include "clang/Sema/SemaDiagnostic.h" 27#include "clang/Basic/Builtins.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30#include "llvm/Support/ErrorHandling.h" 31#include "llvm/Support/raw_ostream.h" 32#include <algorithm> 33#include <cstring> 34using namespace clang; 35 36/// isKnownToHaveBooleanValue - Return true if this is an integer expression 37/// that is known to return 0 or 1. This happens for _Bool/bool expressions 38/// but also int expressions which are produced by things like comparisons in 39/// C. 40bool Expr::isKnownToHaveBooleanValue() const { 41 const Expr *E = IgnoreParens(); 42 43 // If this value has _Bool type, it is obvious 0/1. 44 if (E->getType()->isBooleanType()) return true; 45 // If this is a non-scalar-integer type, we don't care enough to try. 46 if (!E->getType()->isIntegralOrEnumerationType()) return false; 47 48 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) { 49 switch (UO->getOpcode()) { 50 case UO_Plus: 51 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 52 default: 53 return false; 54 } 55 } 56 57 // Only look through implicit casts. If the user writes 58 // '(int) (a && b)' treat it as an arbitrary int. 59 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E)) 60 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 61 62 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 63 switch (BO->getOpcode()) { 64 default: return false; 65 case BO_LT: // Relational operators. 66 case BO_GT: 67 case BO_LE: 68 case BO_GE: 69 case BO_EQ: // Equality operators. 70 case BO_NE: 71 case BO_LAnd: // AND operator. 72 case BO_LOr: // Logical OR operator. 73 return true; 74 75 case BO_And: // Bitwise AND operator. 76 case BO_Xor: // Bitwise XOR operator. 77 case BO_Or: // Bitwise OR operator. 78 // Handle things like (x==2)|(y==12). 79 return BO->getLHS()->isKnownToHaveBooleanValue() && 80 BO->getRHS()->isKnownToHaveBooleanValue(); 81 82 case BO_Comma: 83 case BO_Assign: 84 return BO->getRHS()->isKnownToHaveBooleanValue(); 85 } 86 } 87 88 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) 89 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 90 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 91 92 return false; 93} 94 95// Amusing macro metaprogramming hack: check whether a class provides 96// a more specific implementation of getExprLoc(). 97// 98// See also Stmt.cpp:{getLocStart(),getLocEnd()}. 99namespace { 100 /// This implementation is used when a class provides a custom 101 /// implementation of getExprLoc. 102 template <class E, class T> 103 SourceLocation getExprLocImpl(const Expr *expr, 104 SourceLocation (T::*v)() const) { 105 return static_cast<const E*>(expr)->getExprLoc(); 106 } 107 108 /// This implementation is used when a class doesn't provide 109 /// a custom implementation of getExprLoc. Overload resolution 110 /// should pick it over the implementation above because it's 111 /// more specialized according to function template partial ordering. 112 template <class E> 113 SourceLocation getExprLocImpl(const Expr *expr, 114 SourceLocation (Expr::*v)() const) { 115 return static_cast<const E*>(expr)->getLocStart(); 116 } 117} 118 119SourceLocation Expr::getExprLoc() const { 120 switch (getStmtClass()) { 121 case Stmt::NoStmtClass: llvm_unreachable("statement without class"); 122#define ABSTRACT_STMT(type) 123#define STMT(type, base) \ 124 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break; 125#define EXPR(type, base) \ 126 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc); 127#include "clang/AST/StmtNodes.inc" 128 } 129 llvm_unreachable("unknown statement kind"); 130} 131 132//===----------------------------------------------------------------------===// 133// Primary Expressions. 134//===----------------------------------------------------------------------===// 135 136/// \brief Compute the type-, value-, and instantiation-dependence of a 137/// declaration reference 138/// based on the declaration being referenced. 139static void computeDeclRefDependence(ASTContext &Ctx, NamedDecl *D, QualType T, 140 bool &TypeDependent, 141 bool &ValueDependent, 142 bool &InstantiationDependent) { 143 TypeDependent = false; 144 ValueDependent = false; 145 InstantiationDependent = false; 146 147 // (TD) C++ [temp.dep.expr]p3: 148 // An id-expression is type-dependent if it contains: 149 // 150 // and 151 // 152 // (VD) C++ [temp.dep.constexpr]p2: 153 // An identifier is value-dependent if it is: 154 155 // (TD) - an identifier that was declared with dependent type 156 // (VD) - a name declared with a dependent type, 157 if (T->isDependentType()) { 158 TypeDependent = true; 159 ValueDependent = true; 160 InstantiationDependent = true; 161 return; 162 } else if (T->isInstantiationDependentType()) { 163 InstantiationDependent = true; 164 } 165 166 // (TD) - a conversion-function-id that specifies a dependent type 167 if (D->getDeclName().getNameKind() 168 == DeclarationName::CXXConversionFunctionName) { 169 QualType T = D->getDeclName().getCXXNameType(); 170 if (T->isDependentType()) { 171 TypeDependent = true; 172 ValueDependent = true; 173 InstantiationDependent = true; 174 return; 175 } 176 177 if (T->isInstantiationDependentType()) 178 InstantiationDependent = true; 179 } 180 181 // (VD) - the name of a non-type template parameter, 182 if (isa<NonTypeTemplateParmDecl>(D)) { 183 ValueDependent = true; 184 InstantiationDependent = true; 185 return; 186 } 187 188 // (VD) - a constant with integral or enumeration type and is 189 // initialized with an expression that is value-dependent. 190 // (VD) - a constant with literal type and is initialized with an 191 // expression that is value-dependent [C++11]. 192 // (VD) - FIXME: Missing from the standard: 193 // - an entity with reference type and is initialized with an 194 // expression that is value-dependent [C++11] 195 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 196 if ((Ctx.getLangOptions().CPlusPlus0x ? 197 Var->getType()->isLiteralType() : 198 Var->getType()->isIntegralOrEnumerationType()) && 199 (Var->getType().getCVRQualifiers() == Qualifiers::Const || 200 Var->getType()->isReferenceType())) { 201 if (const Expr *Init = Var->getAnyInitializer()) 202 if (Init->isValueDependent()) { 203 ValueDependent = true; 204 InstantiationDependent = true; 205 } 206 } 207 208 // (VD) - FIXME: Missing from the standard: 209 // - a member function or a static data member of the current 210 // instantiation 211 if (Var->isStaticDataMember() && 212 Var->getDeclContext()->isDependentContext()) { 213 ValueDependent = true; 214 InstantiationDependent = true; 215 } 216 217 return; 218 } 219 220 // (VD) - FIXME: Missing from the standard: 221 // - a member function or a static data member of the current 222 // instantiation 223 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) { 224 ValueDependent = true; 225 InstantiationDependent = true; 226 } 227} 228 229void DeclRefExpr::computeDependence(ASTContext &Ctx) { 230 bool TypeDependent = false; 231 bool ValueDependent = false; 232 bool InstantiationDependent = false; 233 computeDeclRefDependence(Ctx, getDecl(), getType(), TypeDependent, 234 ValueDependent, InstantiationDependent); 235 236 // (TD) C++ [temp.dep.expr]p3: 237 // An id-expression is type-dependent if it contains: 238 // 239 // and 240 // 241 // (VD) C++ [temp.dep.constexpr]p2: 242 // An identifier is value-dependent if it is: 243 if (!TypeDependent && !ValueDependent && 244 hasExplicitTemplateArgs() && 245 TemplateSpecializationType::anyDependentTemplateArguments( 246 getTemplateArgs(), 247 getNumTemplateArgs(), 248 InstantiationDependent)) { 249 TypeDependent = true; 250 ValueDependent = true; 251 InstantiationDependent = true; 252 } 253 254 ExprBits.TypeDependent = TypeDependent; 255 ExprBits.ValueDependent = ValueDependent; 256 ExprBits.InstantiationDependent = InstantiationDependent; 257 258 // Is the declaration a parameter pack? 259 if (getDecl()->isParameterPack()) 260 ExprBits.ContainsUnexpandedParameterPack = true; 261} 262 263DeclRefExpr::DeclRefExpr(ASTContext &Ctx, 264 NestedNameSpecifierLoc QualifierLoc, 265 SourceLocation TemplateKWLoc, 266 ValueDecl *D, const DeclarationNameInfo &NameInfo, 267 NamedDecl *FoundD, 268 const TemplateArgumentListInfo *TemplateArgs, 269 QualType T, ExprValueKind VK) 270 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 271 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 272 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0; 273 if (QualifierLoc) 274 getInternalQualifierLoc() = QualifierLoc; 275 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0; 276 if (FoundD) 277 getInternalFoundDecl() = FoundD; 278 DeclRefExprBits.HasTemplateKWAndArgsInfo 279 = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0; 280 if (TemplateArgs) { 281 bool Dependent = false; 282 bool InstantiationDependent = false; 283 bool ContainsUnexpandedParameterPack = false; 284 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *TemplateArgs, 285 Dependent, 286 InstantiationDependent, 287 ContainsUnexpandedParameterPack); 288 if (InstantiationDependent) 289 setInstantiationDependent(true); 290 } else if (TemplateKWLoc.isValid()) { 291 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 292 } 293 DeclRefExprBits.HadMultipleCandidates = 0; 294 295 computeDependence(Ctx); 296} 297 298DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 299 NestedNameSpecifierLoc QualifierLoc, 300 SourceLocation TemplateKWLoc, 301 ValueDecl *D, 302 SourceLocation NameLoc, 303 QualType T, 304 ExprValueKind VK, 305 NamedDecl *FoundD, 306 const TemplateArgumentListInfo *TemplateArgs) { 307 return Create(Context, QualifierLoc, TemplateKWLoc, D, 308 DeclarationNameInfo(D->getDeclName(), NameLoc), 309 T, VK, FoundD, TemplateArgs); 310} 311 312DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 313 NestedNameSpecifierLoc QualifierLoc, 314 SourceLocation TemplateKWLoc, 315 ValueDecl *D, 316 const DeclarationNameInfo &NameInfo, 317 QualType T, 318 ExprValueKind VK, 319 NamedDecl *FoundD, 320 const TemplateArgumentListInfo *TemplateArgs) { 321 // Filter out cases where the found Decl is the same as the value refenenced. 322 if (D == FoundD) 323 FoundD = 0; 324 325 std::size_t Size = sizeof(DeclRefExpr); 326 if (QualifierLoc != 0) 327 Size += sizeof(NestedNameSpecifierLoc); 328 if (FoundD) 329 Size += sizeof(NamedDecl *); 330 if (TemplateArgs) 331 Size += ASTTemplateKWAndArgsInfo::sizeFor(TemplateArgs->size()); 332 else if (TemplateKWLoc.isValid()) 333 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 334 335 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 336 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D, 337 NameInfo, FoundD, TemplateArgs, T, VK); 338} 339 340DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 341 bool HasQualifier, 342 bool HasFoundDecl, 343 bool HasTemplateKWAndArgsInfo, 344 unsigned NumTemplateArgs) { 345 std::size_t Size = sizeof(DeclRefExpr); 346 if (HasQualifier) 347 Size += sizeof(NestedNameSpecifierLoc); 348 if (HasFoundDecl) 349 Size += sizeof(NamedDecl *); 350 if (HasTemplateKWAndArgsInfo) 351 Size += ASTTemplateKWAndArgsInfo::sizeFor(NumTemplateArgs); 352 353 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 354 return new (Mem) DeclRefExpr(EmptyShell()); 355} 356 357SourceRange DeclRefExpr::getSourceRange() const { 358 SourceRange R = getNameInfo().getSourceRange(); 359 if (hasQualifier()) 360 R.setBegin(getQualifierLoc().getBeginLoc()); 361 if (hasExplicitTemplateArgs()) 362 R.setEnd(getRAngleLoc()); 363 return R; 364} 365SourceLocation DeclRefExpr::getLocStart() const { 366 if (hasQualifier()) 367 return getQualifierLoc().getBeginLoc(); 368 return getNameInfo().getLocStart(); 369} 370SourceLocation DeclRefExpr::getLocEnd() const { 371 if (hasExplicitTemplateArgs()) 372 return getRAngleLoc(); 373 return getNameInfo().getLocEnd(); 374} 375 376// FIXME: Maybe this should use DeclPrinter with a special "print predefined 377// expr" policy instead. 378std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 379 ASTContext &Context = CurrentDecl->getASTContext(); 380 381 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 382 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 383 return FD->getNameAsString(); 384 385 SmallString<256> Name; 386 llvm::raw_svector_ostream Out(Name); 387 388 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 389 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 390 Out << "virtual "; 391 if (MD->isStatic()) 392 Out << "static "; 393 } 394 395 PrintingPolicy Policy(Context.getLangOptions()); 396 397 std::string Proto = FD->getQualifiedNameAsString(Policy); 398 399 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 400 const FunctionProtoType *FT = 0; 401 if (FD->hasWrittenPrototype()) 402 FT = dyn_cast<FunctionProtoType>(AFT); 403 404 Proto += "("; 405 if (FT) { 406 llvm::raw_string_ostream POut(Proto); 407 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 408 if (i) POut << ", "; 409 std::string Param; 410 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 411 POut << Param; 412 } 413 414 if (FT->isVariadic()) { 415 if (FD->getNumParams()) POut << ", "; 416 POut << "..."; 417 } 418 } 419 Proto += ")"; 420 421 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 422 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 423 if (ThisQuals.hasConst()) 424 Proto += " const"; 425 if (ThisQuals.hasVolatile()) 426 Proto += " volatile"; 427 } 428 429 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 430 AFT->getResultType().getAsStringInternal(Proto, Policy); 431 432 Out << Proto; 433 434 Out.flush(); 435 return Name.str().str(); 436 } 437 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 438 SmallString<256> Name; 439 llvm::raw_svector_ostream Out(Name); 440 Out << (MD->isInstanceMethod() ? '-' : '+'); 441 Out << '['; 442 443 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 444 // a null check to avoid a crash. 445 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 446 Out << *ID; 447 448 if (const ObjCCategoryImplDecl *CID = 449 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 450 Out << '(' << *CID << ')'; 451 452 Out << ' '; 453 Out << MD->getSelector().getAsString(); 454 Out << ']'; 455 456 Out.flush(); 457 return Name.str().str(); 458 } 459 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 460 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 461 return "top level"; 462 } 463 return ""; 464} 465 466void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 467 if (hasAllocation()) 468 C.Deallocate(pVal); 469 470 BitWidth = Val.getBitWidth(); 471 unsigned NumWords = Val.getNumWords(); 472 const uint64_t* Words = Val.getRawData(); 473 if (NumWords > 1) { 474 pVal = new (C) uint64_t[NumWords]; 475 std::copy(Words, Words + NumWords, pVal); 476 } else if (NumWords == 1) 477 VAL = Words[0]; 478 else 479 VAL = 0; 480} 481 482IntegerLiteral * 483IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 484 QualType type, SourceLocation l) { 485 return new (C) IntegerLiteral(C, V, type, l); 486} 487 488IntegerLiteral * 489IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 490 return new (C) IntegerLiteral(Empty); 491} 492 493FloatingLiteral * 494FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 495 bool isexact, QualType Type, SourceLocation L) { 496 return new (C) FloatingLiteral(C, V, isexact, Type, L); 497} 498 499FloatingLiteral * 500FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 501 return new (C) FloatingLiteral(C, Empty); 502} 503 504/// getValueAsApproximateDouble - This returns the value as an inaccurate 505/// double. Note that this may cause loss of precision, but is useful for 506/// debugging dumps, etc. 507double FloatingLiteral::getValueAsApproximateDouble() const { 508 llvm::APFloat V = getValue(); 509 bool ignored; 510 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 511 &ignored); 512 return V.convertToDouble(); 513} 514 515int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) { 516 int CharByteWidth = 0; 517 switch(k) { 518 case Ascii: 519 case UTF8: 520 CharByteWidth = target.getCharWidth(); 521 break; 522 case Wide: 523 CharByteWidth = target.getWCharWidth(); 524 break; 525 case UTF16: 526 CharByteWidth = target.getChar16Width(); 527 break; 528 case UTF32: 529 CharByteWidth = target.getChar32Width(); 530 break; 531 } 532 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 533 CharByteWidth /= 8; 534 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 535 && "character byte widths supported are 1, 2, and 4 only"); 536 return CharByteWidth; 537} 538 539StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str, 540 StringKind Kind, bool Pascal, QualType Ty, 541 const SourceLocation *Loc, 542 unsigned NumStrs) { 543 // Allocate enough space for the StringLiteral plus an array of locations for 544 // any concatenated string tokens. 545 void *Mem = C.Allocate(sizeof(StringLiteral)+ 546 sizeof(SourceLocation)*(NumStrs-1), 547 llvm::alignOf<StringLiteral>()); 548 StringLiteral *SL = new (Mem) StringLiteral(Ty); 549 550 // OPTIMIZE: could allocate this appended to the StringLiteral. 551 SL->setString(C,Str,Kind,Pascal); 552 553 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->CharByteWidth = 0; 567 SL->Length = 0; 568 SL->NumConcatenated = NumStrs; 569 return SL; 570} 571 572void StringLiteral::setString(ASTContext &C, StringRef Str, 573 StringKind Kind, bool IsPascal) { 574 //FIXME: we assume that the string data comes from a target that uses the same 575 // code unit size and endianess for the type of string. 576 this->Kind = Kind; 577 this->IsPascal = IsPascal; 578 579 CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind); 580 assert((Str.size()%CharByteWidth == 0) 581 && "size of data must be multiple of CharByteWidth"); 582 Length = Str.size()/CharByteWidth; 583 584 switch(CharByteWidth) { 585 case 1: { 586 char *AStrData = new (C) char[Length]; 587 std::memcpy(AStrData,Str.data(),Str.size()); 588 StrData.asChar = AStrData; 589 break; 590 } 591 case 2: { 592 uint16_t *AStrData = new (C) uint16_t[Length]; 593 std::memcpy(AStrData,Str.data(),Str.size()); 594 StrData.asUInt16 = AStrData; 595 break; 596 } 597 case 4: { 598 uint32_t *AStrData = new (C) uint32_t[Length]; 599 std::memcpy(AStrData,Str.data(),Str.size()); 600 StrData.asUInt32 = AStrData; 601 break; 602 } 603 default: 604 assert(false && "unsupported CharByteWidth"); 605 } 606} 607 608/// getLocationOfByte - Return a source location that points to the specified 609/// byte of this string literal. 610/// 611/// Strings are amazingly complex. They can be formed from multiple tokens and 612/// can have escape sequences in them in addition to the usual trigraph and 613/// escaped newline business. This routine handles this complexity. 614/// 615SourceLocation StringLiteral:: 616getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 617 const LangOptions &Features, const TargetInfo &Target) const { 618 assert(Kind == StringLiteral::Ascii && "This only works for ASCII strings"); 619 620 // Loop over all of the tokens in this string until we find the one that 621 // contains the byte we're looking for. 622 unsigned TokNo = 0; 623 while (1) { 624 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 625 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 626 627 // Get the spelling of the string so that we can get the data that makes up 628 // the string literal, not the identifier for the macro it is potentially 629 // expanded through. 630 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 631 632 // Re-lex the token to get its length and original spelling. 633 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 634 bool Invalid = false; 635 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 636 if (Invalid) 637 return StrTokSpellingLoc; 638 639 const char *StrData = Buffer.data()+LocInfo.second; 640 641 // Create a langops struct and enable trigraphs. This is sufficient for 642 // relexing tokens. 643 LangOptions LangOpts; 644 LangOpts.Trigraphs = true; 645 646 // Create a lexer starting at the beginning of this token. 647 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 648 Buffer.end()); 649 Token TheTok; 650 TheLexer.LexFromRawLexer(TheTok); 651 652 // Use the StringLiteralParser to compute the length of the string in bytes. 653 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 654 unsigned TokNumBytes = SLP.GetStringLength(); 655 656 // If the byte is in this token, return the location of the byte. 657 if (ByteNo < TokNumBytes || 658 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) { 659 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 660 661 // Now that we know the offset of the token in the spelling, use the 662 // preprocessor to get the offset in the original source. 663 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 664 } 665 666 // Move to the next string token. 667 ++TokNo; 668 ByteNo -= TokNumBytes; 669 } 670} 671 672 673 674/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 675/// corresponds to, e.g. "sizeof" or "[pre]++". 676const char *UnaryOperator::getOpcodeStr(Opcode Op) { 677 switch (Op) { 678 case UO_PostInc: return "++"; 679 case UO_PostDec: return "--"; 680 case UO_PreInc: return "++"; 681 case UO_PreDec: return "--"; 682 case UO_AddrOf: return "&"; 683 case UO_Deref: return "*"; 684 case UO_Plus: return "+"; 685 case UO_Minus: return "-"; 686 case UO_Not: return "~"; 687 case UO_LNot: return "!"; 688 case UO_Real: return "__real"; 689 case UO_Imag: return "__imag"; 690 case UO_Extension: return "__extension__"; 691 } 692 llvm_unreachable("Unknown unary operator"); 693} 694 695UnaryOperatorKind 696UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 697 switch (OO) { 698 default: llvm_unreachable("No unary operator for overloaded function"); 699 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 700 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 701 case OO_Amp: return UO_AddrOf; 702 case OO_Star: return UO_Deref; 703 case OO_Plus: return UO_Plus; 704 case OO_Minus: return UO_Minus; 705 case OO_Tilde: return UO_Not; 706 case OO_Exclaim: return UO_LNot; 707 } 708} 709 710OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 711 switch (Opc) { 712 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 713 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 714 case UO_AddrOf: return OO_Amp; 715 case UO_Deref: return OO_Star; 716 case UO_Plus: return OO_Plus; 717 case UO_Minus: return OO_Minus; 718 case UO_Not: return OO_Tilde; 719 case UO_LNot: return OO_Exclaim; 720 default: return OO_None; 721 } 722} 723 724 725//===----------------------------------------------------------------------===// 726// Postfix Operators. 727//===----------------------------------------------------------------------===// 728 729CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 730 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 731 SourceLocation rparenloc) 732 : Expr(SC, t, VK, OK_Ordinary, 733 fn->isTypeDependent(), 734 fn->isValueDependent(), 735 fn->isInstantiationDependent(), 736 fn->containsUnexpandedParameterPack()), 737 NumArgs(numargs) { 738 739 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 740 SubExprs[FN] = fn; 741 for (unsigned i = 0; i != numargs; ++i) { 742 if (args[i]->isTypeDependent()) 743 ExprBits.TypeDependent = true; 744 if (args[i]->isValueDependent()) 745 ExprBits.ValueDependent = true; 746 if (args[i]->isInstantiationDependent()) 747 ExprBits.InstantiationDependent = true; 748 if (args[i]->containsUnexpandedParameterPack()) 749 ExprBits.ContainsUnexpandedParameterPack = true; 750 751 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 752 } 753 754 CallExprBits.NumPreArgs = NumPreArgs; 755 RParenLoc = rparenloc; 756} 757 758CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 759 QualType t, ExprValueKind VK, SourceLocation rparenloc) 760 : Expr(CallExprClass, t, VK, OK_Ordinary, 761 fn->isTypeDependent(), 762 fn->isValueDependent(), 763 fn->isInstantiationDependent(), 764 fn->containsUnexpandedParameterPack()), 765 NumArgs(numargs) { 766 767 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 768 SubExprs[FN] = fn; 769 for (unsigned i = 0; i != numargs; ++i) { 770 if (args[i]->isTypeDependent()) 771 ExprBits.TypeDependent = true; 772 if (args[i]->isValueDependent()) 773 ExprBits.ValueDependent = true; 774 if (args[i]->isInstantiationDependent()) 775 ExprBits.InstantiationDependent = true; 776 if (args[i]->containsUnexpandedParameterPack()) 777 ExprBits.ContainsUnexpandedParameterPack = true; 778 779 SubExprs[i+PREARGS_START] = args[i]; 780 } 781 782 CallExprBits.NumPreArgs = 0; 783 RParenLoc = rparenloc; 784} 785 786CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 787 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 788 // FIXME: Why do we allocate this? 789 SubExprs = new (C) Stmt*[PREARGS_START]; 790 CallExprBits.NumPreArgs = 0; 791} 792 793CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 794 EmptyShell Empty) 795 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 796 // FIXME: Why do we allocate this? 797 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 798 CallExprBits.NumPreArgs = NumPreArgs; 799} 800 801Decl *CallExpr::getCalleeDecl() { 802 Expr *CEE = getCallee()->IgnoreParenImpCasts(); 803 804 while (SubstNonTypeTemplateParmExpr *NTTP 805 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) { 806 CEE = NTTP->getReplacement()->IgnoreParenCasts(); 807 } 808 809 // If we're calling a dereference, look at the pointer instead. 810 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 811 if (BO->isPtrMemOp()) 812 CEE = BO->getRHS()->IgnoreParenCasts(); 813 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 814 if (UO->getOpcode() == UO_Deref) 815 CEE = UO->getSubExpr()->IgnoreParenCasts(); 816 } 817 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 818 return DRE->getDecl(); 819 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 820 return ME->getMemberDecl(); 821 822 return 0; 823} 824 825FunctionDecl *CallExpr::getDirectCallee() { 826 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 827} 828 829/// setNumArgs - This changes the number of arguments present in this call. 830/// Any orphaned expressions are deleted by this, and any new operands are set 831/// to null. 832void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 833 // No change, just return. 834 if (NumArgs == getNumArgs()) return; 835 836 // If shrinking # arguments, just delete the extras and forgot them. 837 if (NumArgs < getNumArgs()) { 838 this->NumArgs = NumArgs; 839 return; 840 } 841 842 // Otherwise, we are growing the # arguments. New an bigger argument array. 843 unsigned NumPreArgs = getNumPreArgs(); 844 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 845 // Copy over args. 846 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 847 NewSubExprs[i] = SubExprs[i]; 848 // Null out new args. 849 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 850 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 851 NewSubExprs[i] = 0; 852 853 if (SubExprs) C.Deallocate(SubExprs); 854 SubExprs = NewSubExprs; 855 this->NumArgs = NumArgs; 856} 857 858/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 859/// not, return 0. 860unsigned CallExpr::isBuiltinCall() const { 861 // All simple function calls (e.g. func()) are implicitly cast to pointer to 862 // function. As a result, we try and obtain the DeclRefExpr from the 863 // ImplicitCastExpr. 864 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 865 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 866 return 0; 867 868 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 869 if (!DRE) 870 return 0; 871 872 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 873 if (!FDecl) 874 return 0; 875 876 if (!FDecl->getIdentifier()) 877 return 0; 878 879 return FDecl->getBuiltinID(); 880} 881 882QualType CallExpr::getCallReturnType() const { 883 QualType CalleeType = getCallee()->getType(); 884 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 885 CalleeType = FnTypePtr->getPointeeType(); 886 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 887 CalleeType = BPT->getPointeeType(); 888 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) 889 // This should never be overloaded and so should never return null. 890 CalleeType = Expr::findBoundMemberType(getCallee()); 891 892 const FunctionType *FnType = CalleeType->castAs<FunctionType>(); 893 return FnType->getResultType(); 894} 895 896SourceRange CallExpr::getSourceRange() const { 897 if (isa<CXXOperatorCallExpr>(this)) 898 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 899 900 SourceLocation begin = getCallee()->getLocStart(); 901 if (begin.isInvalid() && getNumArgs() > 0) 902 begin = getArg(0)->getLocStart(); 903 SourceLocation end = getRParenLoc(); 904 if (end.isInvalid() && getNumArgs() > 0) 905 end = getArg(getNumArgs() - 1)->getLocEnd(); 906 return SourceRange(begin, end); 907} 908 909OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 910 SourceLocation OperatorLoc, 911 TypeSourceInfo *tsi, 912 OffsetOfNode* compsPtr, unsigned numComps, 913 Expr** exprsPtr, unsigned numExprs, 914 SourceLocation RParenLoc) { 915 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 916 sizeof(OffsetOfNode) * numComps + 917 sizeof(Expr*) * numExprs); 918 919 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 920 exprsPtr, numExprs, RParenLoc); 921} 922 923OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 924 unsigned numComps, unsigned numExprs) { 925 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 926 sizeof(OffsetOfNode) * numComps + 927 sizeof(Expr*) * numExprs); 928 return new (Mem) OffsetOfExpr(numComps, numExprs); 929} 930 931OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 932 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 933 OffsetOfNode* compsPtr, unsigned numComps, 934 Expr** exprsPtr, unsigned numExprs, 935 SourceLocation RParenLoc) 936 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 937 /*TypeDependent=*/false, 938 /*ValueDependent=*/tsi->getType()->isDependentType(), 939 tsi->getType()->isInstantiationDependentType(), 940 tsi->getType()->containsUnexpandedParameterPack()), 941 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 942 NumComps(numComps), NumExprs(numExprs) 943{ 944 for(unsigned i = 0; i < numComps; ++i) { 945 setComponent(i, compsPtr[i]); 946 } 947 948 for(unsigned i = 0; i < numExprs; ++i) { 949 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 950 ExprBits.ValueDependent = true; 951 if (exprsPtr[i]->containsUnexpandedParameterPack()) 952 ExprBits.ContainsUnexpandedParameterPack = true; 953 954 setIndexExpr(i, exprsPtr[i]); 955 } 956} 957 958IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 959 assert(getKind() == Field || getKind() == Identifier); 960 if (getKind() == Field) 961 return getField()->getIdentifier(); 962 963 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 964} 965 966MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 967 NestedNameSpecifierLoc QualifierLoc, 968 SourceLocation TemplateKWLoc, 969 ValueDecl *memberdecl, 970 DeclAccessPair founddecl, 971 DeclarationNameInfo nameinfo, 972 const TemplateArgumentListInfo *targs, 973 QualType ty, 974 ExprValueKind vk, 975 ExprObjectKind ok) { 976 std::size_t Size = sizeof(MemberExpr); 977 978 bool hasQualOrFound = (QualifierLoc || 979 founddecl.getDecl() != memberdecl || 980 founddecl.getAccess() != memberdecl->getAccess()); 981 if (hasQualOrFound) 982 Size += sizeof(MemberNameQualifier); 983 984 if (targs) 985 Size += ASTTemplateKWAndArgsInfo::sizeFor(targs->size()); 986 else if (TemplateKWLoc.isValid()) 987 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 988 989 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 990 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 991 ty, vk, ok); 992 993 if (hasQualOrFound) { 994 // FIXME: Wrong. We should be looking at the member declaration we found. 995 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 996 E->setValueDependent(true); 997 E->setTypeDependent(true); 998 E->setInstantiationDependent(true); 999 } 1000 else if (QualifierLoc && 1001 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) 1002 E->setInstantiationDependent(true); 1003 1004 E->HasQualifierOrFoundDecl = true; 1005 1006 MemberNameQualifier *NQ = E->getMemberQualifier(); 1007 NQ->QualifierLoc = QualifierLoc; 1008 NQ->FoundDecl = founddecl; 1009 } 1010 1011 E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid()); 1012 1013 if (targs) { 1014 bool Dependent = false; 1015 bool InstantiationDependent = false; 1016 bool ContainsUnexpandedParameterPack = false; 1017 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *targs, 1018 Dependent, 1019 InstantiationDependent, 1020 ContainsUnexpandedParameterPack); 1021 if (InstantiationDependent) 1022 E->setInstantiationDependent(true); 1023 } else if (TemplateKWLoc.isValid()) { 1024 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 1025 } 1026 1027 return E; 1028} 1029 1030SourceRange MemberExpr::getSourceRange() const { 1031 return SourceRange(getLocStart(), getLocEnd()); 1032} 1033SourceLocation MemberExpr::getLocStart() const { 1034 if (isImplicitAccess()) { 1035 if (hasQualifier()) 1036 return getQualifierLoc().getBeginLoc(); 1037 return MemberLoc; 1038 } 1039 1040 // FIXME: We don't want this to happen. Rather, we should be able to 1041 // detect all kinds of implicit accesses more cleanly. 1042 SourceLocation BaseStartLoc = getBase()->getLocStart(); 1043 if (BaseStartLoc.isValid()) 1044 return BaseStartLoc; 1045 return MemberLoc; 1046} 1047SourceLocation MemberExpr::getLocEnd() const { 1048 if (hasExplicitTemplateArgs()) 1049 return getRAngleLoc(); 1050 return getMemberNameInfo().getEndLoc(); 1051} 1052 1053void CastExpr::CheckCastConsistency() const { 1054 switch (getCastKind()) { 1055 case CK_DerivedToBase: 1056 case CK_UncheckedDerivedToBase: 1057 case CK_DerivedToBaseMemberPointer: 1058 case CK_BaseToDerived: 1059 case CK_BaseToDerivedMemberPointer: 1060 assert(!path_empty() && "Cast kind should have a base path!"); 1061 break; 1062 1063 case CK_CPointerToObjCPointerCast: 1064 assert(getType()->isObjCObjectPointerType()); 1065 assert(getSubExpr()->getType()->isPointerType()); 1066 goto CheckNoBasePath; 1067 1068 case CK_BlockPointerToObjCPointerCast: 1069 assert(getType()->isObjCObjectPointerType()); 1070 assert(getSubExpr()->getType()->isBlockPointerType()); 1071 goto CheckNoBasePath; 1072 1073 case CK_ReinterpretMemberPointer: 1074 assert(getType()->isMemberPointerType()); 1075 assert(getSubExpr()->getType()->isMemberPointerType()); 1076 goto CheckNoBasePath; 1077 1078 case CK_BitCast: 1079 // Arbitrary casts to C pointer types count as bitcasts. 1080 // Otherwise, we should only have block and ObjC pointer casts 1081 // here if they stay within the type kind. 1082 if (!getType()->isPointerType()) { 1083 assert(getType()->isObjCObjectPointerType() == 1084 getSubExpr()->getType()->isObjCObjectPointerType()); 1085 assert(getType()->isBlockPointerType() == 1086 getSubExpr()->getType()->isBlockPointerType()); 1087 } 1088 goto CheckNoBasePath; 1089 1090 case CK_AnyPointerToBlockPointerCast: 1091 assert(getType()->isBlockPointerType()); 1092 assert(getSubExpr()->getType()->isAnyPointerType() && 1093 !getSubExpr()->getType()->isBlockPointerType()); 1094 goto CheckNoBasePath; 1095 1096 case CK_CopyAndAutoreleaseBlockObject: 1097 assert(getType()->isBlockPointerType()); 1098 assert(getSubExpr()->getType()->isBlockPointerType()); 1099 goto CheckNoBasePath; 1100 1101 // These should not have an inheritance path. 1102 case CK_Dynamic: 1103 case CK_ToUnion: 1104 case CK_ArrayToPointerDecay: 1105 case CK_FunctionToPointerDecay: 1106 case CK_NullToMemberPointer: 1107 case CK_NullToPointer: 1108 case CK_ConstructorConversion: 1109 case CK_IntegralToPointer: 1110 case CK_PointerToIntegral: 1111 case CK_ToVoid: 1112 case CK_VectorSplat: 1113 case CK_IntegralCast: 1114 case CK_IntegralToFloating: 1115 case CK_FloatingToIntegral: 1116 case CK_FloatingCast: 1117 case CK_ObjCObjectLValueCast: 1118 case CK_FloatingRealToComplex: 1119 case CK_FloatingComplexToReal: 1120 case CK_FloatingComplexCast: 1121 case CK_FloatingComplexToIntegralComplex: 1122 case CK_IntegralRealToComplex: 1123 case CK_IntegralComplexToReal: 1124 case CK_IntegralComplexCast: 1125 case CK_IntegralComplexToFloatingComplex: 1126 case CK_ARCProduceObject: 1127 case CK_ARCConsumeObject: 1128 case CK_ARCReclaimReturnedObject: 1129 case CK_ARCExtendBlockObject: 1130 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 1131 goto CheckNoBasePath; 1132 1133 case CK_Dependent: 1134 case CK_LValueToRValue: 1135 case CK_NoOp: 1136 case CK_AtomicToNonAtomic: 1137 case CK_NonAtomicToAtomic: 1138 case CK_PointerToBoolean: 1139 case CK_IntegralToBoolean: 1140 case CK_FloatingToBoolean: 1141 case CK_MemberPointerToBoolean: 1142 case CK_FloatingComplexToBoolean: 1143 case CK_IntegralComplexToBoolean: 1144 case CK_LValueBitCast: // -> bool& 1145 case CK_UserDefinedConversion: // operator bool() 1146 CheckNoBasePath: 1147 assert(path_empty() && "Cast kind should not have a base path!"); 1148 break; 1149 } 1150} 1151 1152const char *CastExpr::getCastKindName() const { 1153 switch (getCastKind()) { 1154 case CK_Dependent: 1155 return "Dependent"; 1156 case CK_BitCast: 1157 return "BitCast"; 1158 case CK_LValueBitCast: 1159 return "LValueBitCast"; 1160 case CK_LValueToRValue: 1161 return "LValueToRValue"; 1162 case CK_NoOp: 1163 return "NoOp"; 1164 case CK_BaseToDerived: 1165 return "BaseToDerived"; 1166 case CK_DerivedToBase: 1167 return "DerivedToBase"; 1168 case CK_UncheckedDerivedToBase: 1169 return "UncheckedDerivedToBase"; 1170 case CK_Dynamic: 1171 return "Dynamic"; 1172 case CK_ToUnion: 1173 return "ToUnion"; 1174 case CK_ArrayToPointerDecay: 1175 return "ArrayToPointerDecay"; 1176 case CK_FunctionToPointerDecay: 1177 return "FunctionToPointerDecay"; 1178 case CK_NullToMemberPointer: 1179 return "NullToMemberPointer"; 1180 case CK_NullToPointer: 1181 return "NullToPointer"; 1182 case CK_BaseToDerivedMemberPointer: 1183 return "BaseToDerivedMemberPointer"; 1184 case CK_DerivedToBaseMemberPointer: 1185 return "DerivedToBaseMemberPointer"; 1186 case CK_ReinterpretMemberPointer: 1187 return "ReinterpretMemberPointer"; 1188 case CK_UserDefinedConversion: 1189 return "UserDefinedConversion"; 1190 case CK_ConstructorConversion: 1191 return "ConstructorConversion"; 1192 case CK_IntegralToPointer: 1193 return "IntegralToPointer"; 1194 case CK_PointerToIntegral: 1195 return "PointerToIntegral"; 1196 case CK_PointerToBoolean: 1197 return "PointerToBoolean"; 1198 case CK_ToVoid: 1199 return "ToVoid"; 1200 case CK_VectorSplat: 1201 return "VectorSplat"; 1202 case CK_IntegralCast: 1203 return "IntegralCast"; 1204 case CK_IntegralToBoolean: 1205 return "IntegralToBoolean"; 1206 case CK_IntegralToFloating: 1207 return "IntegralToFloating"; 1208 case CK_FloatingToIntegral: 1209 return "FloatingToIntegral"; 1210 case CK_FloatingCast: 1211 return "FloatingCast"; 1212 case CK_FloatingToBoolean: 1213 return "FloatingToBoolean"; 1214 case CK_MemberPointerToBoolean: 1215 return "MemberPointerToBoolean"; 1216 case CK_CPointerToObjCPointerCast: 1217 return "CPointerToObjCPointerCast"; 1218 case CK_BlockPointerToObjCPointerCast: 1219 return "BlockPointerToObjCPointerCast"; 1220 case CK_AnyPointerToBlockPointerCast: 1221 return "AnyPointerToBlockPointerCast"; 1222 case CK_ObjCObjectLValueCast: 1223 return "ObjCObjectLValueCast"; 1224 case CK_FloatingRealToComplex: 1225 return "FloatingRealToComplex"; 1226 case CK_FloatingComplexToReal: 1227 return "FloatingComplexToReal"; 1228 case CK_FloatingComplexToBoolean: 1229 return "FloatingComplexToBoolean"; 1230 case CK_FloatingComplexCast: 1231 return "FloatingComplexCast"; 1232 case CK_FloatingComplexToIntegralComplex: 1233 return "FloatingComplexToIntegralComplex"; 1234 case CK_IntegralRealToComplex: 1235 return "IntegralRealToComplex"; 1236 case CK_IntegralComplexToReal: 1237 return "IntegralComplexToReal"; 1238 case CK_IntegralComplexToBoolean: 1239 return "IntegralComplexToBoolean"; 1240 case CK_IntegralComplexCast: 1241 return "IntegralComplexCast"; 1242 case CK_IntegralComplexToFloatingComplex: 1243 return "IntegralComplexToFloatingComplex"; 1244 case CK_ARCConsumeObject: 1245 return "ARCConsumeObject"; 1246 case CK_ARCProduceObject: 1247 return "ARCProduceObject"; 1248 case CK_ARCReclaimReturnedObject: 1249 return "ARCReclaimReturnedObject"; 1250 case CK_ARCExtendBlockObject: 1251 return "ARCCExtendBlockObject"; 1252 case CK_AtomicToNonAtomic: 1253 return "AtomicToNonAtomic"; 1254 case CK_NonAtomicToAtomic: 1255 return "NonAtomicToAtomic"; 1256 case CK_CopyAndAutoreleaseBlockObject: 1257 return "CopyAndAutoreleaseBlockObject"; 1258 } 1259 1260 llvm_unreachable("Unhandled cast kind!"); 1261} 1262 1263Expr *CastExpr::getSubExprAsWritten() { 1264 Expr *SubExpr = 0; 1265 CastExpr *E = this; 1266 do { 1267 SubExpr = E->getSubExpr(); 1268 1269 // Skip through reference binding to temporary. 1270 if (MaterializeTemporaryExpr *Materialize 1271 = dyn_cast<MaterializeTemporaryExpr>(SubExpr)) 1272 SubExpr = Materialize->GetTemporaryExpr(); 1273 1274 // Skip any temporary bindings; they're implicit. 1275 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1276 SubExpr = Binder->getSubExpr(); 1277 1278 // Conversions by constructor and conversion functions have a 1279 // subexpression describing the call; strip it off. 1280 if (E->getCastKind() == CK_ConstructorConversion) 1281 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1282 else if (E->getCastKind() == CK_UserDefinedConversion) 1283 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1284 1285 // If the subexpression we're left with is an implicit cast, look 1286 // through that, too. 1287 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1288 1289 return SubExpr; 1290} 1291 1292CXXBaseSpecifier **CastExpr::path_buffer() { 1293 switch (getStmtClass()) { 1294#define ABSTRACT_STMT(x) 1295#define CASTEXPR(Type, Base) \ 1296 case Stmt::Type##Class: \ 1297 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1298#define STMT(Type, Base) 1299#include "clang/AST/StmtNodes.inc" 1300 default: 1301 llvm_unreachable("non-cast expressions not possible here"); 1302 } 1303} 1304 1305void CastExpr::setCastPath(const CXXCastPath &Path) { 1306 assert(Path.size() == path_size()); 1307 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1308} 1309 1310ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1311 CastKind Kind, Expr *Operand, 1312 const CXXCastPath *BasePath, 1313 ExprValueKind VK) { 1314 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1315 void *Buffer = 1316 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1317 ImplicitCastExpr *E = 1318 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1319 if (PathSize) E->setCastPath(*BasePath); 1320 return E; 1321} 1322 1323ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1324 unsigned PathSize) { 1325 void *Buffer = 1326 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1327 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1328} 1329 1330 1331CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1332 ExprValueKind VK, CastKind K, Expr *Op, 1333 const CXXCastPath *BasePath, 1334 TypeSourceInfo *WrittenTy, 1335 SourceLocation L, SourceLocation R) { 1336 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1337 void *Buffer = 1338 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1339 CStyleCastExpr *E = 1340 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1341 if (PathSize) E->setCastPath(*BasePath); 1342 return E; 1343} 1344 1345CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1346 void *Buffer = 1347 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1348 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1349} 1350 1351/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1352/// corresponds to, e.g. "<<=". 1353const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1354 switch (Op) { 1355 case BO_PtrMemD: return ".*"; 1356 case BO_PtrMemI: return "->*"; 1357 case BO_Mul: return "*"; 1358 case BO_Div: return "/"; 1359 case BO_Rem: return "%"; 1360 case BO_Add: return "+"; 1361 case BO_Sub: return "-"; 1362 case BO_Shl: return "<<"; 1363 case BO_Shr: return ">>"; 1364 case BO_LT: return "<"; 1365 case BO_GT: return ">"; 1366 case BO_LE: return "<="; 1367 case BO_GE: return ">="; 1368 case BO_EQ: return "=="; 1369 case BO_NE: return "!="; 1370 case BO_And: return "&"; 1371 case BO_Xor: return "^"; 1372 case BO_Or: return "|"; 1373 case BO_LAnd: return "&&"; 1374 case BO_LOr: return "||"; 1375 case BO_Assign: return "="; 1376 case BO_MulAssign: return "*="; 1377 case BO_DivAssign: return "/="; 1378 case BO_RemAssign: return "%="; 1379 case BO_AddAssign: return "+="; 1380 case BO_SubAssign: return "-="; 1381 case BO_ShlAssign: return "<<="; 1382 case BO_ShrAssign: return ">>="; 1383 case BO_AndAssign: return "&="; 1384 case BO_XorAssign: return "^="; 1385 case BO_OrAssign: return "|="; 1386 case BO_Comma: return ","; 1387 } 1388 1389 llvm_unreachable("Invalid OpCode!"); 1390} 1391 1392BinaryOperatorKind 1393BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1394 switch (OO) { 1395 default: llvm_unreachable("Not an overloadable binary operator"); 1396 case OO_Plus: return BO_Add; 1397 case OO_Minus: return BO_Sub; 1398 case OO_Star: return BO_Mul; 1399 case OO_Slash: return BO_Div; 1400 case OO_Percent: return BO_Rem; 1401 case OO_Caret: return BO_Xor; 1402 case OO_Amp: return BO_And; 1403 case OO_Pipe: return BO_Or; 1404 case OO_Equal: return BO_Assign; 1405 case OO_Less: return BO_LT; 1406 case OO_Greater: return BO_GT; 1407 case OO_PlusEqual: return BO_AddAssign; 1408 case OO_MinusEqual: return BO_SubAssign; 1409 case OO_StarEqual: return BO_MulAssign; 1410 case OO_SlashEqual: return BO_DivAssign; 1411 case OO_PercentEqual: return BO_RemAssign; 1412 case OO_CaretEqual: return BO_XorAssign; 1413 case OO_AmpEqual: return BO_AndAssign; 1414 case OO_PipeEqual: return BO_OrAssign; 1415 case OO_LessLess: return BO_Shl; 1416 case OO_GreaterGreater: return BO_Shr; 1417 case OO_LessLessEqual: return BO_ShlAssign; 1418 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1419 case OO_EqualEqual: return BO_EQ; 1420 case OO_ExclaimEqual: return BO_NE; 1421 case OO_LessEqual: return BO_LE; 1422 case OO_GreaterEqual: return BO_GE; 1423 case OO_AmpAmp: return BO_LAnd; 1424 case OO_PipePipe: return BO_LOr; 1425 case OO_Comma: return BO_Comma; 1426 case OO_ArrowStar: return BO_PtrMemI; 1427 } 1428} 1429 1430OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1431 static const OverloadedOperatorKind OverOps[] = { 1432 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1433 OO_Star, OO_Slash, OO_Percent, 1434 OO_Plus, OO_Minus, 1435 OO_LessLess, OO_GreaterGreater, 1436 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1437 OO_EqualEqual, OO_ExclaimEqual, 1438 OO_Amp, 1439 OO_Caret, 1440 OO_Pipe, 1441 OO_AmpAmp, 1442 OO_PipePipe, 1443 OO_Equal, OO_StarEqual, 1444 OO_SlashEqual, OO_PercentEqual, 1445 OO_PlusEqual, OO_MinusEqual, 1446 OO_LessLessEqual, OO_GreaterGreaterEqual, 1447 OO_AmpEqual, OO_CaretEqual, 1448 OO_PipeEqual, 1449 OO_Comma 1450 }; 1451 return OverOps[Opc]; 1452} 1453 1454InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1455 Expr **initExprs, unsigned numInits, 1456 SourceLocation rbraceloc) 1457 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1458 false, false), 1459 InitExprs(C, numInits), 1460 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0) 1461{ 1462 sawArrayRangeDesignator(false); 1463 setInitializesStdInitializerList(false); 1464 for (unsigned I = 0; I != numInits; ++I) { 1465 if (initExprs[I]->isTypeDependent()) 1466 ExprBits.TypeDependent = true; 1467 if (initExprs[I]->isValueDependent()) 1468 ExprBits.ValueDependent = true; 1469 if (initExprs[I]->isInstantiationDependent()) 1470 ExprBits.InstantiationDependent = true; 1471 if (initExprs[I]->containsUnexpandedParameterPack()) 1472 ExprBits.ContainsUnexpandedParameterPack = true; 1473 } 1474 1475 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1476} 1477 1478void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1479 if (NumInits > InitExprs.size()) 1480 InitExprs.reserve(C, NumInits); 1481} 1482 1483void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1484 InitExprs.resize(C, NumInits, 0); 1485} 1486 1487Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1488 if (Init >= InitExprs.size()) { 1489 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1490 InitExprs.back() = expr; 1491 return 0; 1492 } 1493 1494 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1495 InitExprs[Init] = expr; 1496 return Result; 1497} 1498 1499void InitListExpr::setArrayFiller(Expr *filler) { 1500 assert(!hasArrayFiller() && "Filler already set!"); 1501 ArrayFillerOrUnionFieldInit = filler; 1502 // Fill out any "holes" in the array due to designated initializers. 1503 Expr **inits = getInits(); 1504 for (unsigned i = 0, e = getNumInits(); i != e; ++i) 1505 if (inits[i] == 0) 1506 inits[i] = filler; 1507} 1508 1509SourceRange InitListExpr::getSourceRange() const { 1510 if (SyntacticForm) 1511 return SyntacticForm->getSourceRange(); 1512 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1513 if (Beg.isInvalid()) { 1514 // Find the first non-null initializer. 1515 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1516 E = InitExprs.end(); 1517 I != E; ++I) { 1518 if (Stmt *S = *I) { 1519 Beg = S->getLocStart(); 1520 break; 1521 } 1522 } 1523 } 1524 if (End.isInvalid()) { 1525 // Find the first non-null initializer from the end. 1526 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1527 E = InitExprs.rend(); 1528 I != E; ++I) { 1529 if (Stmt *S = *I) { 1530 End = S->getSourceRange().getEnd(); 1531 break; 1532 } 1533 } 1534 } 1535 return SourceRange(Beg, End); 1536} 1537 1538/// getFunctionType - Return the underlying function type for this block. 1539/// 1540const FunctionProtoType *BlockExpr::getFunctionType() const { 1541 // The block pointer is never sugared, but the function type might be. 1542 return cast<BlockPointerType>(getType()) 1543 ->getPointeeType()->castAs<FunctionProtoType>(); 1544} 1545 1546SourceLocation BlockExpr::getCaretLocation() const { 1547 return TheBlock->getCaretLocation(); 1548} 1549const Stmt *BlockExpr::getBody() const { 1550 return TheBlock->getBody(); 1551} 1552Stmt *BlockExpr::getBody() { 1553 return TheBlock->getBody(); 1554} 1555 1556 1557//===----------------------------------------------------------------------===// 1558// Generic Expression Routines 1559//===----------------------------------------------------------------------===// 1560 1561/// isUnusedResultAWarning - Return true if this immediate expression should 1562/// be warned about if the result is unused. If so, fill in Loc and Ranges 1563/// with location to warn on and the source range[s] to report with the 1564/// warning. 1565bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1566 SourceRange &R2, ASTContext &Ctx) const { 1567 // Don't warn if the expr is type dependent. The type could end up 1568 // instantiating to void. 1569 if (isTypeDependent()) 1570 return false; 1571 1572 switch (getStmtClass()) { 1573 default: 1574 if (getType()->isVoidType()) 1575 return false; 1576 Loc = getExprLoc(); 1577 R1 = getSourceRange(); 1578 return true; 1579 case ParenExprClass: 1580 return cast<ParenExpr>(this)->getSubExpr()-> 1581 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1582 case GenericSelectionExprClass: 1583 return cast<GenericSelectionExpr>(this)->getResultExpr()-> 1584 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1585 case UnaryOperatorClass: { 1586 const UnaryOperator *UO = cast<UnaryOperator>(this); 1587 1588 switch (UO->getOpcode()) { 1589 default: break; 1590 case UO_PostInc: 1591 case UO_PostDec: 1592 case UO_PreInc: 1593 case UO_PreDec: // ++/-- 1594 return false; // Not a warning. 1595 case UO_Deref: 1596 // Dereferencing a volatile pointer is a side-effect. 1597 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1598 return false; 1599 break; 1600 case UO_Real: 1601 case UO_Imag: 1602 // accessing a piece of a volatile complex is a side-effect. 1603 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1604 .isVolatileQualified()) 1605 return false; 1606 break; 1607 case UO_Extension: 1608 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1609 } 1610 Loc = UO->getOperatorLoc(); 1611 R1 = UO->getSubExpr()->getSourceRange(); 1612 return true; 1613 } 1614 case BinaryOperatorClass: { 1615 const BinaryOperator *BO = cast<BinaryOperator>(this); 1616 switch (BO->getOpcode()) { 1617 default: 1618 break; 1619 // Consider the RHS of comma for side effects. LHS was checked by 1620 // Sema::CheckCommaOperands. 1621 case BO_Comma: 1622 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1623 // lvalue-ness) of an assignment written in a macro. 1624 if (IntegerLiteral *IE = 1625 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1626 if (IE->getValue() == 0) 1627 return false; 1628 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1629 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1630 case BO_LAnd: 1631 case BO_LOr: 1632 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1633 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1634 return false; 1635 break; 1636 } 1637 if (BO->isAssignmentOp()) 1638 return false; 1639 Loc = BO->getOperatorLoc(); 1640 R1 = BO->getLHS()->getSourceRange(); 1641 R2 = BO->getRHS()->getSourceRange(); 1642 return true; 1643 } 1644 case CompoundAssignOperatorClass: 1645 case VAArgExprClass: 1646 case AtomicExprClass: 1647 return false; 1648 1649 case ConditionalOperatorClass: { 1650 // If only one of the LHS or RHS is a warning, the operator might 1651 // be being used for control flow. Only warn if both the LHS and 1652 // RHS are warnings. 1653 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1654 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1655 return false; 1656 if (!Exp->getLHS()) 1657 return true; 1658 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1659 } 1660 1661 case MemberExprClass: 1662 // If the base pointer or element is to a volatile pointer/field, accessing 1663 // it is a side effect. 1664 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1665 return false; 1666 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1667 R1 = SourceRange(Loc, Loc); 1668 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1669 return true; 1670 1671 case ArraySubscriptExprClass: 1672 // If the base pointer or element is to a volatile pointer/field, accessing 1673 // it is a side effect. 1674 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1675 return false; 1676 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1677 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1678 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1679 return true; 1680 1681 case CXXOperatorCallExprClass: { 1682 // We warn about operator== and operator!= even when user-defined operator 1683 // overloads as there is no reasonable way to define these such that they 1684 // have non-trivial, desirable side-effects. See the -Wunused-comparison 1685 // warning: these operators are commonly typo'ed, and so warning on them 1686 // provides additional value as well. If this list is updated, 1687 // DiagnoseUnusedComparison should be as well. 1688 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this); 1689 if (Op->getOperator() == OO_EqualEqual || 1690 Op->getOperator() == OO_ExclaimEqual) { 1691 Loc = Op->getOperatorLoc(); 1692 R1 = Op->getSourceRange(); 1693 return true; 1694 } 1695 1696 // Fallthrough for generic call handling. 1697 } 1698 case CallExprClass: 1699 case CXXMemberCallExprClass: 1700 case UserDefinedLiteralClass: { 1701 // If this is a direct call, get the callee. 1702 const CallExpr *CE = cast<CallExpr>(this); 1703 if (const Decl *FD = CE->getCalleeDecl()) { 1704 // If the callee has attribute pure, const, or warn_unused_result, warn 1705 // about it. void foo() { strlen("bar"); } should warn. 1706 // 1707 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1708 // updated to match for QoI. 1709 if (FD->getAttr<WarnUnusedResultAttr>() || 1710 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1711 Loc = CE->getCallee()->getLocStart(); 1712 R1 = CE->getCallee()->getSourceRange(); 1713 1714 if (unsigned NumArgs = CE->getNumArgs()) 1715 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1716 CE->getArg(NumArgs-1)->getLocEnd()); 1717 return true; 1718 } 1719 } 1720 return false; 1721 } 1722 1723 case CXXTemporaryObjectExprClass: 1724 case CXXConstructExprClass: 1725 return false; 1726 1727 case ObjCMessageExprClass: { 1728 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1729 if (Ctx.getLangOptions().ObjCAutoRefCount && 1730 ME->isInstanceMessage() && 1731 !ME->getType()->isVoidType() && 1732 ME->getSelector().getIdentifierInfoForSlot(0) && 1733 ME->getSelector().getIdentifierInfoForSlot(0) 1734 ->getName().startswith("init")) { 1735 Loc = getExprLoc(); 1736 R1 = ME->getSourceRange(); 1737 return true; 1738 } 1739 1740 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1741 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1742 Loc = getExprLoc(); 1743 return true; 1744 } 1745 return false; 1746 } 1747 1748 case ObjCPropertyRefExprClass: 1749 Loc = getExprLoc(); 1750 R1 = getSourceRange(); 1751 return true; 1752 1753 case PseudoObjectExprClass: { 1754 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this); 1755 1756 // Only complain about things that have the form of a getter. 1757 if (isa<UnaryOperator>(PO->getSyntacticForm()) || 1758 isa<BinaryOperator>(PO->getSyntacticForm())) 1759 return false; 1760 1761 Loc = getExprLoc(); 1762 R1 = getSourceRange(); 1763 return true; 1764 } 1765 1766 case StmtExprClass: { 1767 // Statement exprs don't logically have side effects themselves, but are 1768 // sometimes used in macros in ways that give them a type that is unused. 1769 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1770 // however, if the result of the stmt expr is dead, we don't want to emit a 1771 // warning. 1772 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1773 if (!CS->body_empty()) { 1774 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1775 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1776 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1777 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1778 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1779 } 1780 1781 if (getType()->isVoidType()) 1782 return false; 1783 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1784 R1 = getSourceRange(); 1785 return true; 1786 } 1787 case CStyleCastExprClass: 1788 // If this is an explicit cast to void, allow it. People do this when they 1789 // think they know what they're doing :). 1790 if (getType()->isVoidType()) 1791 return false; 1792 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1793 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1794 return true; 1795 case CXXFunctionalCastExprClass: { 1796 if (getType()->isVoidType()) 1797 return false; 1798 const CastExpr *CE = cast<CastExpr>(this); 1799 1800 // If this is a cast to void or a constructor conversion, check the operand. 1801 // Otherwise, the result of the cast is unused. 1802 if (CE->getCastKind() == CK_ToVoid || 1803 CE->getCastKind() == CK_ConstructorConversion) 1804 return (cast<CastExpr>(this)->getSubExpr() 1805 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1806 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1807 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1808 return true; 1809 } 1810 1811 case ImplicitCastExprClass: 1812 // Check the operand, since implicit casts are inserted by Sema 1813 return (cast<ImplicitCastExpr>(this) 1814 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1815 1816 case CXXDefaultArgExprClass: 1817 return (cast<CXXDefaultArgExpr>(this) 1818 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1819 1820 case CXXNewExprClass: 1821 // FIXME: In theory, there might be new expressions that don't have side 1822 // effects (e.g. a placement new with an uninitialized POD). 1823 case CXXDeleteExprClass: 1824 return false; 1825 case CXXBindTemporaryExprClass: 1826 return (cast<CXXBindTemporaryExpr>(this) 1827 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1828 case ExprWithCleanupsClass: 1829 return (cast<ExprWithCleanups>(this) 1830 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1831 } 1832} 1833 1834/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1835/// returns true, if it is; false otherwise. 1836bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1837 const Expr *E = IgnoreParens(); 1838 switch (E->getStmtClass()) { 1839 default: 1840 return false; 1841 case ObjCIvarRefExprClass: 1842 return true; 1843 case Expr::UnaryOperatorClass: 1844 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1845 case ImplicitCastExprClass: 1846 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1847 case MaterializeTemporaryExprClass: 1848 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr() 1849 ->isOBJCGCCandidate(Ctx); 1850 case CStyleCastExprClass: 1851 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1852 case BlockDeclRefExprClass: 1853 case DeclRefExprClass: { 1854 1855 const Decl *D; 1856 if (const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E)) 1857 D = BDRE->getDecl(); 1858 else 1859 D = cast<DeclRefExpr>(E)->getDecl(); 1860 1861 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1862 if (VD->hasGlobalStorage()) 1863 return true; 1864 QualType T = VD->getType(); 1865 // dereferencing to a pointer is always a gc'able candidate, 1866 // unless it is __weak. 1867 return T->isPointerType() && 1868 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1869 } 1870 return false; 1871 } 1872 case MemberExprClass: { 1873 const MemberExpr *M = cast<MemberExpr>(E); 1874 return M->getBase()->isOBJCGCCandidate(Ctx); 1875 } 1876 case ArraySubscriptExprClass: 1877 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx); 1878 } 1879} 1880 1881bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1882 if (isTypeDependent()) 1883 return false; 1884 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1885} 1886 1887QualType Expr::findBoundMemberType(const Expr *expr) { 1888 assert(expr->hasPlaceholderType(BuiltinType::BoundMember)); 1889 1890 // Bound member expressions are always one of these possibilities: 1891 // x->m x.m x->*y x.*y 1892 // (possibly parenthesized) 1893 1894 expr = expr->IgnoreParens(); 1895 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) { 1896 assert(isa<CXXMethodDecl>(mem->getMemberDecl())); 1897 return mem->getMemberDecl()->getType(); 1898 } 1899 1900 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) { 1901 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>() 1902 ->getPointeeType(); 1903 assert(type->isFunctionType()); 1904 return type; 1905 } 1906 1907 assert(isa<UnresolvedMemberExpr>(expr)); 1908 return QualType(); 1909} 1910 1911static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1912 Expr::CanThrowResult CT2) { 1913 // CanThrowResult constants are ordered so that the maximum is the correct 1914 // merge result. 1915 return CT1 > CT2 ? CT1 : CT2; 1916} 1917 1918static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1919 Expr *E = const_cast<Expr*>(CE); 1920 Expr::CanThrowResult R = Expr::CT_Cannot; 1921 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1922 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1923 } 1924 return R; 1925} 1926 1927static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Expr *E, 1928 const Decl *D, 1929 bool NullThrows = true) { 1930 if (!D) 1931 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1932 1933 // See if we can get a function type from the decl somehow. 1934 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1935 if (!VD) // If we have no clue what we're calling, assume the worst. 1936 return Expr::CT_Can; 1937 1938 // As an extension, we assume that __attribute__((nothrow)) functions don't 1939 // throw. 1940 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1941 return Expr::CT_Cannot; 1942 1943 QualType T = VD->getType(); 1944 const FunctionProtoType *FT; 1945 if ((FT = T->getAs<FunctionProtoType>())) { 1946 } else if (const PointerType *PT = T->getAs<PointerType>()) 1947 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1948 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1949 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1950 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1951 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1952 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1953 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1954 1955 if (!FT) 1956 return Expr::CT_Can; 1957 1958 if (FT->getExceptionSpecType() == EST_Delayed) { 1959 assert(isa<CXXConstructorDecl>(D) && 1960 "only constructor exception specs can be unknown"); 1961 Ctx.getDiagnostics().Report(E->getLocStart(), 1962 diag::err_exception_spec_unknown) 1963 << E->getSourceRange(); 1964 return Expr::CT_Can; 1965 } 1966 1967 return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can; 1968} 1969 1970static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1971 if (DC->isTypeDependent()) 1972 return Expr::CT_Dependent; 1973 1974 if (!DC->getTypeAsWritten()->isReferenceType()) 1975 return Expr::CT_Cannot; 1976 1977 if (DC->getSubExpr()->isTypeDependent()) 1978 return Expr::CT_Dependent; 1979 1980 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1981} 1982 1983static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1984 const CXXTypeidExpr *DC) { 1985 if (DC->isTypeOperand()) 1986 return Expr::CT_Cannot; 1987 1988 Expr *Op = DC->getExprOperand(); 1989 if (Op->isTypeDependent()) 1990 return Expr::CT_Dependent; 1991 1992 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1993 if (!RT) 1994 return Expr::CT_Cannot; 1995 1996 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1997 return Expr::CT_Cannot; 1998 1999 if (Op->Classify(C).isPRValue()) 2000 return Expr::CT_Cannot; 2001 2002 return Expr::CT_Can; 2003} 2004 2005Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 2006 // C++ [expr.unary.noexcept]p3: 2007 // [Can throw] if in a potentially-evaluated context the expression would 2008 // contain: 2009 switch (getStmtClass()) { 2010 case CXXThrowExprClass: 2011 // - a potentially evaluated throw-expression 2012 return CT_Can; 2013 2014 case CXXDynamicCastExprClass: { 2015 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 2016 // where T is a reference type, that requires a run-time check 2017 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 2018 if (CT == CT_Can) 2019 return CT; 2020 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2021 } 2022 2023 case CXXTypeidExprClass: 2024 // - a potentially evaluated typeid expression applied to a glvalue 2025 // expression whose type is a polymorphic class type 2026 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 2027 2028 // - a potentially evaluated call to a function, member function, function 2029 // pointer, or member function pointer that does not have a non-throwing 2030 // exception-specification 2031 case CallExprClass: 2032 case CXXMemberCallExprClass: 2033 case CXXOperatorCallExprClass: 2034 case UserDefinedLiteralClass: { 2035 const CallExpr *CE = cast<CallExpr>(this); 2036 CanThrowResult CT; 2037 if (isTypeDependent()) 2038 CT = CT_Dependent; 2039 else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) 2040 CT = CT_Cannot; 2041 else 2042 CT = CanCalleeThrow(C, this, CE->getCalleeDecl()); 2043 if (CT == CT_Can) 2044 return CT; 2045 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2046 } 2047 2048 case CXXConstructExprClass: 2049 case CXXTemporaryObjectExprClass: { 2050 CanThrowResult CT = CanCalleeThrow(C, this, 2051 cast<CXXConstructExpr>(this)->getConstructor()); 2052 if (CT == CT_Can) 2053 return CT; 2054 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2055 } 2056 2057 case LambdaExprClass: { 2058 const LambdaExpr *Lambda = cast<LambdaExpr>(this); 2059 CanThrowResult CT = Expr::CT_Cannot; 2060 for (LambdaExpr::capture_init_iterator Cap = Lambda->capture_init_begin(), 2061 CapEnd = Lambda->capture_init_end(); 2062 Cap != CapEnd; ++Cap) 2063 CT = MergeCanThrow(CT, (*Cap)->CanThrow(C)); 2064 return CT; 2065 } 2066 2067 case CXXNewExprClass: { 2068 CanThrowResult CT; 2069 if (isTypeDependent()) 2070 CT = CT_Dependent; 2071 else 2072 CT = CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getOperatorNew()); 2073 if (CT == CT_Can) 2074 return CT; 2075 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2076 } 2077 2078 case CXXDeleteExprClass: { 2079 CanThrowResult CT; 2080 QualType DTy = cast<CXXDeleteExpr>(this)->getDestroyedType(); 2081 if (DTy.isNull() || DTy->isDependentType()) { 2082 CT = CT_Dependent; 2083 } else { 2084 CT = CanCalleeThrow(C, this, 2085 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 2086 if (const RecordType *RT = DTy->getAs<RecordType>()) { 2087 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2088 CT = MergeCanThrow(CT, CanCalleeThrow(C, this, RD->getDestructor())); 2089 } 2090 if (CT == CT_Can) 2091 return CT; 2092 } 2093 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2094 } 2095 2096 case CXXBindTemporaryExprClass: { 2097 // The bound temporary has to be destroyed again, which might throw. 2098 CanThrowResult CT = CanCalleeThrow(C, this, 2099 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 2100 if (CT == CT_Can) 2101 return CT; 2102 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2103 } 2104 2105 // ObjC message sends are like function calls, but never have exception 2106 // specs. 2107 case ObjCMessageExprClass: 2108 case ObjCPropertyRefExprClass: 2109 case ObjCSubscriptRefExprClass: 2110 return CT_Can; 2111 2112 // All the ObjC literals that are implemented as calls are 2113 // potentially throwing unless we decide to close off that 2114 // possibility. 2115 case ObjCArrayLiteralClass: 2116 case ObjCBoolLiteralExprClass: 2117 case ObjCDictionaryLiteralClass: 2118 case ObjCNumericLiteralClass: 2119 return CT_Can; 2120 2121 // Many other things have subexpressions, so we have to test those. 2122 // Some are simple: 2123 case ConditionalOperatorClass: 2124 case CompoundLiteralExprClass: 2125 case CXXConstCastExprClass: 2126 case CXXDefaultArgExprClass: 2127 case CXXReinterpretCastExprClass: 2128 case DesignatedInitExprClass: 2129 case ExprWithCleanupsClass: 2130 case ExtVectorElementExprClass: 2131 case InitListExprClass: 2132 case MemberExprClass: 2133 case ObjCIsaExprClass: 2134 case ObjCIvarRefExprClass: 2135 case ParenExprClass: 2136 case ParenListExprClass: 2137 case ShuffleVectorExprClass: 2138 case VAArgExprClass: 2139 return CanSubExprsThrow(C, this); 2140 2141 // Some might be dependent for other reasons. 2142 case ArraySubscriptExprClass: 2143 case BinaryOperatorClass: 2144 case CompoundAssignOperatorClass: 2145 case CStyleCastExprClass: 2146 case CXXStaticCastExprClass: 2147 case CXXFunctionalCastExprClass: 2148 case ImplicitCastExprClass: 2149 case MaterializeTemporaryExprClass: 2150 case UnaryOperatorClass: { 2151 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 2152 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2153 } 2154 2155 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 2156 case StmtExprClass: 2157 return CT_Can; 2158 2159 case ChooseExprClass: 2160 if (isTypeDependent() || isValueDependent()) 2161 return CT_Dependent; 2162 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 2163 2164 case GenericSelectionExprClass: 2165 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2166 return CT_Dependent; 2167 return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C); 2168 2169 // Some expressions are always dependent. 2170 case CXXDependentScopeMemberExprClass: 2171 case CXXUnresolvedConstructExprClass: 2172 case DependentScopeDeclRefExprClass: 2173 return CT_Dependent; 2174 2175 case AtomicExprClass: 2176 case AsTypeExprClass: 2177 case BinaryConditionalOperatorClass: 2178 case BlockExprClass: 2179 case BlockDeclRefExprClass: 2180 case CUDAKernelCallExprClass: 2181 case DeclRefExprClass: 2182 case ObjCBridgedCastExprClass: 2183 case ObjCIndirectCopyRestoreExprClass: 2184 case ObjCProtocolExprClass: 2185 case ObjCSelectorExprClass: 2186 case OffsetOfExprClass: 2187 case PackExpansionExprClass: 2188 case PseudoObjectExprClass: 2189 case SubstNonTypeTemplateParmExprClass: 2190 case SubstNonTypeTemplateParmPackExprClass: 2191 case UnaryExprOrTypeTraitExprClass: 2192 case UnresolvedLookupExprClass: 2193 case UnresolvedMemberExprClass: 2194 // FIXME: Can any of the above throw? If so, when? 2195 return CT_Cannot; 2196 2197 case AddrLabelExprClass: 2198 case ArrayTypeTraitExprClass: 2199 case BinaryTypeTraitExprClass: 2200 case TypeTraitExprClass: 2201 case CXXBoolLiteralExprClass: 2202 case CXXNoexceptExprClass: 2203 case CXXNullPtrLiteralExprClass: 2204 case CXXPseudoDestructorExprClass: 2205 case CXXScalarValueInitExprClass: 2206 case CXXThisExprClass: 2207 case CXXUuidofExprClass: 2208 case CharacterLiteralClass: 2209 case ExpressionTraitExprClass: 2210 case FloatingLiteralClass: 2211 case GNUNullExprClass: 2212 case ImaginaryLiteralClass: 2213 case ImplicitValueInitExprClass: 2214 case IntegerLiteralClass: 2215 case ObjCEncodeExprClass: 2216 case ObjCStringLiteralClass: 2217 case OpaqueValueExprClass: 2218 case PredefinedExprClass: 2219 case SizeOfPackExprClass: 2220 case StringLiteralClass: 2221 case UnaryTypeTraitExprClass: 2222 // These expressions can never throw. 2223 return CT_Cannot; 2224 2225#define STMT(CLASS, PARENT) case CLASS##Class: 2226#define STMT_RANGE(Base, First, Last) 2227#define LAST_STMT_RANGE(BASE, FIRST, LAST) 2228#define EXPR(CLASS, PARENT) 2229#define ABSTRACT_STMT(STMT) 2230#include "clang/AST/StmtNodes.inc" 2231 case NoStmtClass: 2232 llvm_unreachable("Invalid class for expression"); 2233 } 2234 llvm_unreachable("Bogus StmtClass"); 2235} 2236 2237Expr* Expr::IgnoreParens() { 2238 Expr* E = this; 2239 while (true) { 2240 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2241 E = P->getSubExpr(); 2242 continue; 2243 } 2244 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2245 if (P->getOpcode() == UO_Extension) { 2246 E = P->getSubExpr(); 2247 continue; 2248 } 2249 } 2250 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2251 if (!P->isResultDependent()) { 2252 E = P->getResultExpr(); 2253 continue; 2254 } 2255 } 2256 return E; 2257 } 2258} 2259 2260/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 2261/// or CastExprs or ImplicitCastExprs, returning their operand. 2262Expr *Expr::IgnoreParenCasts() { 2263 Expr *E = this; 2264 while (true) { 2265 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2266 E = P->getSubExpr(); 2267 continue; 2268 } 2269 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2270 E = P->getSubExpr(); 2271 continue; 2272 } 2273 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2274 if (P->getOpcode() == UO_Extension) { 2275 E = P->getSubExpr(); 2276 continue; 2277 } 2278 } 2279 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2280 if (!P->isResultDependent()) { 2281 E = P->getResultExpr(); 2282 continue; 2283 } 2284 } 2285 if (MaterializeTemporaryExpr *Materialize 2286 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2287 E = Materialize->GetTemporaryExpr(); 2288 continue; 2289 } 2290 if (SubstNonTypeTemplateParmExpr *NTTP 2291 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2292 E = NTTP->getReplacement(); 2293 continue; 2294 } 2295 return E; 2296 } 2297} 2298 2299/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 2300/// casts. This is intended purely as a temporary workaround for code 2301/// that hasn't yet been rewritten to do the right thing about those 2302/// casts, and may disappear along with the last internal use. 2303Expr *Expr::IgnoreParenLValueCasts() { 2304 Expr *E = this; 2305 while (true) { 2306 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2307 E = P->getSubExpr(); 2308 continue; 2309 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2310 if (P->getCastKind() == CK_LValueToRValue) { 2311 E = P->getSubExpr(); 2312 continue; 2313 } 2314 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2315 if (P->getOpcode() == UO_Extension) { 2316 E = P->getSubExpr(); 2317 continue; 2318 } 2319 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2320 if (!P->isResultDependent()) { 2321 E = P->getResultExpr(); 2322 continue; 2323 } 2324 } else if (MaterializeTemporaryExpr *Materialize 2325 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2326 E = Materialize->GetTemporaryExpr(); 2327 continue; 2328 } else if (SubstNonTypeTemplateParmExpr *NTTP 2329 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2330 E = NTTP->getReplacement(); 2331 continue; 2332 } 2333 break; 2334 } 2335 return E; 2336} 2337 2338Expr *Expr::IgnoreParenImpCasts() { 2339 Expr *E = this; 2340 while (true) { 2341 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2342 E = P->getSubExpr(); 2343 continue; 2344 } 2345 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 2346 E = P->getSubExpr(); 2347 continue; 2348 } 2349 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2350 if (P->getOpcode() == UO_Extension) { 2351 E = P->getSubExpr(); 2352 continue; 2353 } 2354 } 2355 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2356 if (!P->isResultDependent()) { 2357 E = P->getResultExpr(); 2358 continue; 2359 } 2360 } 2361 if (MaterializeTemporaryExpr *Materialize 2362 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2363 E = Materialize->GetTemporaryExpr(); 2364 continue; 2365 } 2366 if (SubstNonTypeTemplateParmExpr *NTTP 2367 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2368 E = NTTP->getReplacement(); 2369 continue; 2370 } 2371 return E; 2372 } 2373} 2374 2375Expr *Expr::IgnoreConversionOperator() { 2376 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) { 2377 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl())) 2378 return MCE->getImplicitObjectArgument(); 2379 } 2380 return this; 2381} 2382 2383/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 2384/// value (including ptr->int casts of the same size). Strip off any 2385/// ParenExpr or CastExprs, returning their operand. 2386Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 2387 Expr *E = this; 2388 while (true) { 2389 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2390 E = P->getSubExpr(); 2391 continue; 2392 } 2393 2394 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2395 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 2396 // ptr<->int casts of the same width. We also ignore all identity casts. 2397 Expr *SE = P->getSubExpr(); 2398 2399 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 2400 E = SE; 2401 continue; 2402 } 2403 2404 if ((E->getType()->isPointerType() || 2405 E->getType()->isIntegralType(Ctx)) && 2406 (SE->getType()->isPointerType() || 2407 SE->getType()->isIntegralType(Ctx)) && 2408 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 2409 E = SE; 2410 continue; 2411 } 2412 } 2413 2414 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2415 if (P->getOpcode() == UO_Extension) { 2416 E = P->getSubExpr(); 2417 continue; 2418 } 2419 } 2420 2421 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2422 if (!P->isResultDependent()) { 2423 E = P->getResultExpr(); 2424 continue; 2425 } 2426 } 2427 2428 if (SubstNonTypeTemplateParmExpr *NTTP 2429 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2430 E = NTTP->getReplacement(); 2431 continue; 2432 } 2433 2434 return E; 2435 } 2436} 2437 2438bool Expr::isDefaultArgument() const { 2439 const Expr *E = this; 2440 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2441 E = M->GetTemporaryExpr(); 2442 2443 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 2444 E = ICE->getSubExprAsWritten(); 2445 2446 return isa<CXXDefaultArgExpr>(E); 2447} 2448 2449/// \brief Skip over any no-op casts and any temporary-binding 2450/// expressions. 2451static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 2452 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2453 E = M->GetTemporaryExpr(); 2454 2455 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2456 if (ICE->getCastKind() == CK_NoOp) 2457 E = ICE->getSubExpr(); 2458 else 2459 break; 2460 } 2461 2462 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2463 E = BE->getSubExpr(); 2464 2465 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2466 if (ICE->getCastKind() == CK_NoOp) 2467 E = ICE->getSubExpr(); 2468 else 2469 break; 2470 } 2471 2472 return E->IgnoreParens(); 2473} 2474 2475/// isTemporaryObject - Determines if this expression produces a 2476/// temporary of the given class type. 2477bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2478 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2479 return false; 2480 2481 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2482 2483 // Temporaries are by definition pr-values of class type. 2484 if (!E->Classify(C).isPRValue()) { 2485 // In this context, property reference is a message call and is pr-value. 2486 if (!isa<ObjCPropertyRefExpr>(E)) 2487 return false; 2488 } 2489 2490 // Black-list a few cases which yield pr-values of class type that don't 2491 // refer to temporaries of that type: 2492 2493 // - implicit derived-to-base conversions 2494 if (isa<ImplicitCastExpr>(E)) { 2495 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2496 case CK_DerivedToBase: 2497 case CK_UncheckedDerivedToBase: 2498 return false; 2499 default: 2500 break; 2501 } 2502 } 2503 2504 // - member expressions (all) 2505 if (isa<MemberExpr>(E)) 2506 return false; 2507 2508 // - opaque values (all) 2509 if (isa<OpaqueValueExpr>(E)) 2510 return false; 2511 2512 return true; 2513} 2514 2515bool Expr::isImplicitCXXThis() const { 2516 const Expr *E = this; 2517 2518 // Strip away parentheses and casts we don't care about. 2519 while (true) { 2520 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2521 E = Paren->getSubExpr(); 2522 continue; 2523 } 2524 2525 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2526 if (ICE->getCastKind() == CK_NoOp || 2527 ICE->getCastKind() == CK_LValueToRValue || 2528 ICE->getCastKind() == CK_DerivedToBase || 2529 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2530 E = ICE->getSubExpr(); 2531 continue; 2532 } 2533 } 2534 2535 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2536 if (UnOp->getOpcode() == UO_Extension) { 2537 E = UnOp->getSubExpr(); 2538 continue; 2539 } 2540 } 2541 2542 if (const MaterializeTemporaryExpr *M 2543 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2544 E = M->GetTemporaryExpr(); 2545 continue; 2546 } 2547 2548 break; 2549 } 2550 2551 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2552 return This->isImplicit(); 2553 2554 return false; 2555} 2556 2557/// hasAnyTypeDependentArguments - Determines if any of the expressions 2558/// in Exprs is type-dependent. 2559bool Expr::hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs) { 2560 for (unsigned I = 0; I < Exprs.size(); ++I) 2561 if (Exprs[I]->isTypeDependent()) 2562 return true; 2563 2564 return false; 2565} 2566 2567bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2568 // This function is attempting whether an expression is an initializer 2569 // which can be evaluated at compile-time. isEvaluatable handles most 2570 // of the cases, but it can't deal with some initializer-specific 2571 // expressions, and it can't deal with aggregates; we deal with those here, 2572 // and fall back to isEvaluatable for the other cases. 2573 2574 // If we ever capture reference-binding directly in the AST, we can 2575 // kill the second parameter. 2576 2577 if (IsForRef) { 2578 EvalResult Result; 2579 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2580 } 2581 2582 switch (getStmtClass()) { 2583 default: break; 2584 case IntegerLiteralClass: 2585 case FloatingLiteralClass: 2586 case StringLiteralClass: 2587 case ObjCStringLiteralClass: 2588 case ObjCEncodeExprClass: 2589 return true; 2590 case CXXTemporaryObjectExprClass: 2591 case CXXConstructExprClass: { 2592 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2593 2594 // Only if it's 2595 if (CE->getConstructor()->isTrivial()) { 2596 // 1) an application of the trivial default constructor or 2597 if (!CE->getNumArgs()) return true; 2598 2599 // 2) an elidable trivial copy construction of an operand which is 2600 // itself a constant initializer. Note that we consider the 2601 // operand on its own, *not* as a reference binding. 2602 if (CE->isElidable() && 2603 CE->getArg(0)->isConstantInitializer(Ctx, false)) 2604 return true; 2605 } 2606 2607 // 3) a foldable constexpr constructor. 2608 break; 2609 } 2610 case CompoundLiteralExprClass: { 2611 // This handles gcc's extension that allows global initializers like 2612 // "struct x {int x;} x = (struct x) {};". 2613 // FIXME: This accepts other cases it shouldn't! 2614 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2615 return Exp->isConstantInitializer(Ctx, false); 2616 } 2617 case InitListExprClass: { 2618 // FIXME: This doesn't deal with fields with reference types correctly. 2619 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2620 // to bitfields. 2621 const InitListExpr *Exp = cast<InitListExpr>(this); 2622 unsigned numInits = Exp->getNumInits(); 2623 for (unsigned i = 0; i < numInits; i++) { 2624 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2625 return false; 2626 } 2627 return true; 2628 } 2629 case ImplicitValueInitExprClass: 2630 return true; 2631 case ParenExprClass: 2632 return cast<ParenExpr>(this)->getSubExpr() 2633 ->isConstantInitializer(Ctx, IsForRef); 2634 case GenericSelectionExprClass: 2635 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2636 return false; 2637 return cast<GenericSelectionExpr>(this)->getResultExpr() 2638 ->isConstantInitializer(Ctx, IsForRef); 2639 case ChooseExprClass: 2640 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2641 ->isConstantInitializer(Ctx, IsForRef); 2642 case UnaryOperatorClass: { 2643 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2644 if (Exp->getOpcode() == UO_Extension) 2645 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2646 break; 2647 } 2648 case CXXFunctionalCastExprClass: 2649 case CXXStaticCastExprClass: 2650 case ImplicitCastExprClass: 2651 case CStyleCastExprClass: { 2652 const CastExpr *CE = cast<CastExpr>(this); 2653 2654 // If we're promoting an integer to an _Atomic type then this is constant 2655 // if the integer is constant. We also need to check the converse in case 2656 // someone does something like: 2657 // 2658 // int a = (_Atomic(int))42; 2659 // 2660 // I doubt anyone would write code like this directly, but it's quite 2661 // possible as the result of macro expansions. 2662 if (CE->getCastKind() == CK_NonAtomicToAtomic || 2663 CE->getCastKind() == CK_AtomicToNonAtomic) 2664 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2665 2666 // Handle bitcasts of vector constants. 2667 if (getType()->isVectorType() && CE->getCastKind() == CK_BitCast) 2668 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2669 2670 // Handle misc casts we want to ignore. 2671 // FIXME: Is it really safe to ignore all these? 2672 if (CE->getCastKind() == CK_NoOp || 2673 CE->getCastKind() == CK_LValueToRValue || 2674 CE->getCastKind() == CK_ToUnion || 2675 CE->getCastKind() == CK_ConstructorConversion) 2676 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2677 2678 break; 2679 } 2680 case MaterializeTemporaryExprClass: 2681 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr() 2682 ->isConstantInitializer(Ctx, false); 2683 } 2684 return isEvaluatable(Ctx); 2685} 2686 2687namespace { 2688 /// \brief Look for a call to a non-trivial function within an expression. 2689 class NonTrivialCallFinder : public EvaluatedExprVisitor<NonTrivialCallFinder> 2690 { 2691 typedef EvaluatedExprVisitor<NonTrivialCallFinder> Inherited; 2692 2693 bool NonTrivial; 2694 2695 public: 2696 explicit NonTrivialCallFinder(ASTContext &Context) 2697 : Inherited(Context), NonTrivial(false) { } 2698 2699 bool hasNonTrivialCall() const { return NonTrivial; } 2700 2701 void VisitCallExpr(CallExpr *E) { 2702 if (CXXMethodDecl *Method 2703 = dyn_cast_or_null<CXXMethodDecl>(E->getCalleeDecl())) { 2704 if (Method->isTrivial()) { 2705 // Recurse to children of the call. 2706 Inherited::VisitStmt(E); 2707 return; 2708 } 2709 } 2710 2711 NonTrivial = true; 2712 } 2713 2714 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2715 if (E->getConstructor()->isTrivial()) { 2716 // Recurse to children of the call. 2717 Inherited::VisitStmt(E); 2718 return; 2719 } 2720 2721 NonTrivial = true; 2722 } 2723 2724 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 2725 if (E->getTemporary()->getDestructor()->isTrivial()) { 2726 Inherited::VisitStmt(E); 2727 return; 2728 } 2729 2730 NonTrivial = true; 2731 } 2732 }; 2733} 2734 2735bool Expr::hasNonTrivialCall(ASTContext &Ctx) { 2736 NonTrivialCallFinder Finder(Ctx); 2737 Finder.Visit(this); 2738 return Finder.hasNonTrivialCall(); 2739} 2740 2741/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2742/// pointer constant or not, as well as the specific kind of constant detected. 2743/// Null pointer constants can be integer constant expressions with the 2744/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2745/// (a GNU extension). 2746Expr::NullPointerConstantKind 2747Expr::isNullPointerConstant(ASTContext &Ctx, 2748 NullPointerConstantValueDependence NPC) const { 2749 if (isValueDependent()) { 2750 switch (NPC) { 2751 case NPC_NeverValueDependent: 2752 llvm_unreachable("Unexpected value dependent expression!"); 2753 case NPC_ValueDependentIsNull: 2754 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2755 return NPCK_ZeroInteger; 2756 else 2757 return NPCK_NotNull; 2758 2759 case NPC_ValueDependentIsNotNull: 2760 return NPCK_NotNull; 2761 } 2762 } 2763 2764 // Strip off a cast to void*, if it exists. Except in C++. 2765 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2766 if (!Ctx.getLangOptions().CPlusPlus) { 2767 // Check that it is a cast to void*. 2768 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2769 QualType Pointee = PT->getPointeeType(); 2770 if (!Pointee.hasQualifiers() && 2771 Pointee->isVoidType() && // to void* 2772 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2773 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2774 } 2775 } 2776 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2777 // Ignore the ImplicitCastExpr type entirely. 2778 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2779 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2780 // Accept ((void*)0) as a null pointer constant, as many other 2781 // implementations do. 2782 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2783 } else if (const GenericSelectionExpr *GE = 2784 dyn_cast<GenericSelectionExpr>(this)) { 2785 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC); 2786 } else if (const CXXDefaultArgExpr *DefaultArg 2787 = dyn_cast<CXXDefaultArgExpr>(this)) { 2788 // See through default argument expressions 2789 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2790 } else if (isa<GNUNullExpr>(this)) { 2791 // The GNU __null extension is always a null pointer constant. 2792 return NPCK_GNUNull; 2793 } else if (const MaterializeTemporaryExpr *M 2794 = dyn_cast<MaterializeTemporaryExpr>(this)) { 2795 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC); 2796 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) { 2797 if (const Expr *Source = OVE->getSourceExpr()) 2798 return Source->isNullPointerConstant(Ctx, NPC); 2799 } 2800 2801 // C++0x nullptr_t is always a null pointer constant. 2802 if (getType()->isNullPtrType()) 2803 return NPCK_CXX0X_nullptr; 2804 2805 if (const RecordType *UT = getType()->getAsUnionType()) 2806 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2807 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2808 const Expr *InitExpr = CLE->getInitializer(); 2809 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2810 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2811 } 2812 // This expression must be an integer type. 2813 if (!getType()->isIntegerType() || 2814 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2815 return NPCK_NotNull; 2816 2817 // If we have an integer constant expression, we need to *evaluate* it and 2818 // test for the value 0. Don't use the C++11 constant expression semantics 2819 // for this, for now; once the dust settles on core issue 903, we might only 2820 // allow a literal 0 here in C++11 mode. 2821 if (Ctx.getLangOptions().CPlusPlus0x) { 2822 if (!isCXX98IntegralConstantExpr(Ctx)) 2823 return NPCK_NotNull; 2824 } else { 2825 if (!isIntegerConstantExpr(Ctx)) 2826 return NPCK_NotNull; 2827 } 2828 2829 return (EvaluateKnownConstInt(Ctx) == 0) ? NPCK_ZeroInteger : NPCK_NotNull; 2830} 2831 2832/// \brief If this expression is an l-value for an Objective C 2833/// property, find the underlying property reference expression. 2834const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2835 const Expr *E = this; 2836 while (true) { 2837 assert((E->getValueKind() == VK_LValue && 2838 E->getObjectKind() == OK_ObjCProperty) && 2839 "expression is not a property reference"); 2840 E = E->IgnoreParenCasts(); 2841 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2842 if (BO->getOpcode() == BO_Comma) { 2843 E = BO->getRHS(); 2844 continue; 2845 } 2846 } 2847 2848 break; 2849 } 2850 2851 return cast<ObjCPropertyRefExpr>(E); 2852} 2853 2854FieldDecl *Expr::getBitField() { 2855 Expr *E = this->IgnoreParens(); 2856 2857 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2858 if (ICE->getCastKind() == CK_LValueToRValue || 2859 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2860 E = ICE->getSubExpr()->IgnoreParens(); 2861 else 2862 break; 2863 } 2864 2865 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2866 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2867 if (Field->isBitField()) 2868 return Field; 2869 2870 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2871 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2872 if (Field->isBitField()) 2873 return Field; 2874 2875 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) { 2876 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2877 return BinOp->getLHS()->getBitField(); 2878 2879 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS()) 2880 return BinOp->getRHS()->getBitField(); 2881 } 2882 2883 return 0; 2884} 2885 2886bool Expr::refersToVectorElement() const { 2887 const Expr *E = this->IgnoreParens(); 2888 2889 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2890 if (ICE->getValueKind() != VK_RValue && 2891 ICE->getCastKind() == CK_NoOp) 2892 E = ICE->getSubExpr()->IgnoreParens(); 2893 else 2894 break; 2895 } 2896 2897 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2898 return ASE->getBase()->getType()->isVectorType(); 2899 2900 if (isa<ExtVectorElementExpr>(E)) 2901 return true; 2902 2903 return false; 2904} 2905 2906/// isArrow - Return true if the base expression is a pointer to vector, 2907/// return false if the base expression is a vector. 2908bool ExtVectorElementExpr::isArrow() const { 2909 return getBase()->getType()->isPointerType(); 2910} 2911 2912unsigned ExtVectorElementExpr::getNumElements() const { 2913 if (const VectorType *VT = getType()->getAs<VectorType>()) 2914 return VT->getNumElements(); 2915 return 1; 2916} 2917 2918/// containsDuplicateElements - Return true if any element access is repeated. 2919bool ExtVectorElementExpr::containsDuplicateElements() const { 2920 // FIXME: Refactor this code to an accessor on the AST node which returns the 2921 // "type" of component access, and share with code below and in Sema. 2922 StringRef Comp = Accessor->getName(); 2923 2924 // Halving swizzles do not contain duplicate elements. 2925 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2926 return false; 2927 2928 // Advance past s-char prefix on hex swizzles. 2929 if (Comp[0] == 's' || Comp[0] == 'S') 2930 Comp = Comp.substr(1); 2931 2932 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2933 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos) 2934 return true; 2935 2936 return false; 2937} 2938 2939/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2940void ExtVectorElementExpr::getEncodedElementAccess( 2941 SmallVectorImpl<unsigned> &Elts) const { 2942 StringRef Comp = Accessor->getName(); 2943 if (Comp[0] == 's' || Comp[0] == 'S') 2944 Comp = Comp.substr(1); 2945 2946 bool isHi = Comp == "hi"; 2947 bool isLo = Comp == "lo"; 2948 bool isEven = Comp == "even"; 2949 bool isOdd = Comp == "odd"; 2950 2951 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2952 uint64_t Index; 2953 2954 if (isHi) 2955 Index = e + i; 2956 else if (isLo) 2957 Index = i; 2958 else if (isEven) 2959 Index = 2 * i; 2960 else if (isOdd) 2961 Index = 2 * i + 1; 2962 else 2963 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2964 2965 Elts.push_back(Index); 2966 } 2967} 2968 2969ObjCMessageExpr::ObjCMessageExpr(QualType T, 2970 ExprValueKind VK, 2971 SourceLocation LBracLoc, 2972 SourceLocation SuperLoc, 2973 bool IsInstanceSuper, 2974 QualType SuperType, 2975 Selector Sel, 2976 ArrayRef<SourceLocation> SelLocs, 2977 SelectorLocationsKind SelLocsK, 2978 ObjCMethodDecl *Method, 2979 ArrayRef<Expr *> Args, 2980 SourceLocation RBracLoc, 2981 bool isImplicit) 2982 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2983 /*TypeDependent=*/false, /*ValueDependent=*/false, 2984 /*InstantiationDependent=*/false, 2985 /*ContainsUnexpandedParameterPack=*/false), 2986 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2987 : Sel.getAsOpaquePtr())), 2988 Kind(IsInstanceSuper? SuperInstance : SuperClass), 2989 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 2990 SuperLoc(SuperLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2991{ 2992 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 2993 setReceiverPointer(SuperType.getAsOpaquePtr()); 2994} 2995 2996ObjCMessageExpr::ObjCMessageExpr(QualType T, 2997 ExprValueKind VK, 2998 SourceLocation LBracLoc, 2999 TypeSourceInfo *Receiver, 3000 Selector Sel, 3001 ArrayRef<SourceLocation> SelLocs, 3002 SelectorLocationsKind SelLocsK, 3003 ObjCMethodDecl *Method, 3004 ArrayRef<Expr *> Args, 3005 SourceLocation RBracLoc, 3006 bool isImplicit) 3007 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 3008 T->isDependentType(), T->isInstantiationDependentType(), 3009 T->containsUnexpandedParameterPack()), 3010 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3011 : Sel.getAsOpaquePtr())), 3012 Kind(Class), 3013 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3014 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3015{ 3016 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3017 setReceiverPointer(Receiver); 3018} 3019 3020ObjCMessageExpr::ObjCMessageExpr(QualType T, 3021 ExprValueKind VK, 3022 SourceLocation LBracLoc, 3023 Expr *Receiver, 3024 Selector Sel, 3025 ArrayRef<SourceLocation> SelLocs, 3026 SelectorLocationsKind SelLocsK, 3027 ObjCMethodDecl *Method, 3028 ArrayRef<Expr *> Args, 3029 SourceLocation RBracLoc, 3030 bool isImplicit) 3031 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 3032 Receiver->isTypeDependent(), 3033 Receiver->isInstantiationDependent(), 3034 Receiver->containsUnexpandedParameterPack()), 3035 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3036 : Sel.getAsOpaquePtr())), 3037 Kind(Instance), 3038 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3039 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3040{ 3041 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3042 setReceiverPointer(Receiver); 3043} 3044 3045void ObjCMessageExpr::initArgsAndSelLocs(ArrayRef<Expr *> Args, 3046 ArrayRef<SourceLocation> SelLocs, 3047 SelectorLocationsKind SelLocsK) { 3048 setNumArgs(Args.size()); 3049 Expr **MyArgs = getArgs(); 3050 for (unsigned I = 0; I != Args.size(); ++I) { 3051 if (Args[I]->isTypeDependent()) 3052 ExprBits.TypeDependent = true; 3053 if (Args[I]->isValueDependent()) 3054 ExprBits.ValueDependent = true; 3055 if (Args[I]->isInstantiationDependent()) 3056 ExprBits.InstantiationDependent = true; 3057 if (Args[I]->containsUnexpandedParameterPack()) 3058 ExprBits.ContainsUnexpandedParameterPack = true; 3059 3060 MyArgs[I] = Args[I]; 3061 } 3062 3063 SelLocsKind = SelLocsK; 3064 if (!isImplicit()) { 3065 if (SelLocsK == SelLoc_NonStandard) 3066 std::copy(SelLocs.begin(), SelLocs.end(), getStoredSelLocs()); 3067 } 3068} 3069 3070ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3071 ExprValueKind VK, 3072 SourceLocation LBracLoc, 3073 SourceLocation SuperLoc, 3074 bool IsInstanceSuper, 3075 QualType SuperType, 3076 Selector Sel, 3077 ArrayRef<SourceLocation> SelLocs, 3078 ObjCMethodDecl *Method, 3079 ArrayRef<Expr *> Args, 3080 SourceLocation RBracLoc, 3081 bool isImplicit) { 3082 assert((!SelLocs.empty() || isImplicit) && 3083 "No selector locs for non-implicit message"); 3084 ObjCMessageExpr *Mem; 3085 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3086 if (isImplicit) 3087 Mem = alloc(Context, Args.size(), 0); 3088 else 3089 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3090 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 3091 SuperType, Sel, SelLocs, SelLocsK, 3092 Method, Args, RBracLoc, isImplicit); 3093} 3094 3095ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3096 ExprValueKind VK, 3097 SourceLocation LBracLoc, 3098 TypeSourceInfo *Receiver, 3099 Selector Sel, 3100 ArrayRef<SourceLocation> SelLocs, 3101 ObjCMethodDecl *Method, 3102 ArrayRef<Expr *> Args, 3103 SourceLocation RBracLoc, 3104 bool isImplicit) { 3105 assert((!SelLocs.empty() || isImplicit) && 3106 "No selector locs for non-implicit message"); 3107 ObjCMessageExpr *Mem; 3108 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3109 if (isImplicit) 3110 Mem = alloc(Context, Args.size(), 0); 3111 else 3112 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3113 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3114 SelLocs, SelLocsK, Method, Args, RBracLoc, 3115 isImplicit); 3116} 3117 3118ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3119 ExprValueKind VK, 3120 SourceLocation LBracLoc, 3121 Expr *Receiver, 3122 Selector Sel, 3123 ArrayRef<SourceLocation> SelLocs, 3124 ObjCMethodDecl *Method, 3125 ArrayRef<Expr *> Args, 3126 SourceLocation RBracLoc, 3127 bool isImplicit) { 3128 assert((!SelLocs.empty() || isImplicit) && 3129 "No selector locs for non-implicit message"); 3130 ObjCMessageExpr *Mem; 3131 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3132 if (isImplicit) 3133 Mem = alloc(Context, Args.size(), 0); 3134 else 3135 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3136 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3137 SelLocs, SelLocsK, Method, Args, RBracLoc, 3138 isImplicit); 3139} 3140 3141ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 3142 unsigned NumArgs, 3143 unsigned NumStoredSelLocs) { 3144 ObjCMessageExpr *Mem = alloc(Context, NumArgs, NumStoredSelLocs); 3145 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 3146} 3147 3148ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3149 ArrayRef<Expr *> Args, 3150 SourceLocation RBraceLoc, 3151 ArrayRef<SourceLocation> SelLocs, 3152 Selector Sel, 3153 SelectorLocationsKind &SelLocsK) { 3154 SelLocsK = hasStandardSelectorLocs(Sel, SelLocs, Args, RBraceLoc); 3155 unsigned NumStoredSelLocs = (SelLocsK == SelLoc_NonStandard) ? SelLocs.size() 3156 : 0; 3157 return alloc(C, Args.size(), NumStoredSelLocs); 3158} 3159 3160ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3161 unsigned NumArgs, 3162 unsigned NumStoredSelLocs) { 3163 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 3164 NumArgs * sizeof(Expr *) + NumStoredSelLocs * sizeof(SourceLocation); 3165 return (ObjCMessageExpr *)C.Allocate(Size, 3166 llvm::AlignOf<ObjCMessageExpr>::Alignment); 3167} 3168 3169void ObjCMessageExpr::getSelectorLocs( 3170 SmallVectorImpl<SourceLocation> &SelLocs) const { 3171 for (unsigned i = 0, e = getNumSelectorLocs(); i != e; ++i) 3172 SelLocs.push_back(getSelectorLoc(i)); 3173} 3174 3175SourceRange ObjCMessageExpr::getReceiverRange() const { 3176 switch (getReceiverKind()) { 3177 case Instance: 3178 return getInstanceReceiver()->getSourceRange(); 3179 3180 case Class: 3181 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 3182 3183 case SuperInstance: 3184 case SuperClass: 3185 return getSuperLoc(); 3186 } 3187 3188 llvm_unreachable("Invalid ReceiverKind!"); 3189} 3190 3191Selector ObjCMessageExpr::getSelector() const { 3192 if (HasMethod) 3193 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 3194 ->getSelector(); 3195 return Selector(SelectorOrMethod); 3196} 3197 3198ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 3199 switch (getReceiverKind()) { 3200 case Instance: 3201 if (const ObjCObjectPointerType *Ptr 3202 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 3203 return Ptr->getInterfaceDecl(); 3204 break; 3205 3206 case Class: 3207 if (const ObjCObjectType *Ty 3208 = getClassReceiver()->getAs<ObjCObjectType>()) 3209 return Ty->getInterface(); 3210 break; 3211 3212 case SuperInstance: 3213 if (const ObjCObjectPointerType *Ptr 3214 = getSuperType()->getAs<ObjCObjectPointerType>()) 3215 return Ptr->getInterfaceDecl(); 3216 break; 3217 3218 case SuperClass: 3219 if (const ObjCObjectType *Iface 3220 = getSuperType()->getAs<ObjCObjectType>()) 3221 return Iface->getInterface(); 3222 break; 3223 } 3224 3225 return 0; 3226} 3227 3228StringRef ObjCBridgedCastExpr::getBridgeKindName() const { 3229 switch (getBridgeKind()) { 3230 case OBC_Bridge: 3231 return "__bridge"; 3232 case OBC_BridgeTransfer: 3233 return "__bridge_transfer"; 3234 case OBC_BridgeRetained: 3235 return "__bridge_retained"; 3236 } 3237 3238 llvm_unreachable("Invalid BridgeKind!"); 3239} 3240 3241bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 3242 return getCond()->EvaluateKnownConstInt(C) != 0; 3243} 3244 3245ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3246 QualType Type, SourceLocation BLoc, 3247 SourceLocation RP) 3248 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 3249 Type->isDependentType(), Type->isDependentType(), 3250 Type->isInstantiationDependentType(), 3251 Type->containsUnexpandedParameterPack()), 3252 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 3253{ 3254 SubExprs = new (C) Stmt*[nexpr]; 3255 for (unsigned i = 0; i < nexpr; i++) { 3256 if (args[i]->isTypeDependent()) 3257 ExprBits.TypeDependent = true; 3258 if (args[i]->isValueDependent()) 3259 ExprBits.ValueDependent = true; 3260 if (args[i]->isInstantiationDependent()) 3261 ExprBits.InstantiationDependent = true; 3262 if (args[i]->containsUnexpandedParameterPack()) 3263 ExprBits.ContainsUnexpandedParameterPack = true; 3264 3265 SubExprs[i] = args[i]; 3266 } 3267} 3268 3269void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 3270 unsigned NumExprs) { 3271 if (SubExprs) C.Deallocate(SubExprs); 3272 3273 SubExprs = new (C) Stmt* [NumExprs]; 3274 this->NumExprs = NumExprs; 3275 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 3276} 3277 3278GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3279 SourceLocation GenericLoc, Expr *ControllingExpr, 3280 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3281 unsigned NumAssocs, SourceLocation DefaultLoc, 3282 SourceLocation RParenLoc, 3283 bool ContainsUnexpandedParameterPack, 3284 unsigned ResultIndex) 3285 : Expr(GenericSelectionExprClass, 3286 AssocExprs[ResultIndex]->getType(), 3287 AssocExprs[ResultIndex]->getValueKind(), 3288 AssocExprs[ResultIndex]->getObjectKind(), 3289 AssocExprs[ResultIndex]->isTypeDependent(), 3290 AssocExprs[ResultIndex]->isValueDependent(), 3291 AssocExprs[ResultIndex]->isInstantiationDependent(), 3292 ContainsUnexpandedParameterPack), 3293 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3294 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3295 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3296 RParenLoc(RParenLoc) { 3297 SubExprs[CONTROLLING] = ControllingExpr; 3298 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3299 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3300} 3301 3302GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3303 SourceLocation GenericLoc, Expr *ControllingExpr, 3304 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3305 unsigned NumAssocs, SourceLocation DefaultLoc, 3306 SourceLocation RParenLoc, 3307 bool ContainsUnexpandedParameterPack) 3308 : Expr(GenericSelectionExprClass, 3309 Context.DependentTy, 3310 VK_RValue, 3311 OK_Ordinary, 3312 /*isTypeDependent=*/true, 3313 /*isValueDependent=*/true, 3314 /*isInstantiationDependent=*/true, 3315 ContainsUnexpandedParameterPack), 3316 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3317 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3318 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3319 RParenLoc(RParenLoc) { 3320 SubExprs[CONTROLLING] = ControllingExpr; 3321 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3322 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3323} 3324 3325//===----------------------------------------------------------------------===// 3326// DesignatedInitExpr 3327//===----------------------------------------------------------------------===// 3328 3329IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const { 3330 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3331 if (Field.NameOrField & 0x01) 3332 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 3333 else 3334 return getField()->getIdentifier(); 3335} 3336 3337DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 3338 unsigned NumDesignators, 3339 const Designator *Designators, 3340 SourceLocation EqualOrColonLoc, 3341 bool GNUSyntax, 3342 Expr **IndexExprs, 3343 unsigned NumIndexExprs, 3344 Expr *Init) 3345 : Expr(DesignatedInitExprClass, Ty, 3346 Init->getValueKind(), Init->getObjectKind(), 3347 Init->isTypeDependent(), Init->isValueDependent(), 3348 Init->isInstantiationDependent(), 3349 Init->containsUnexpandedParameterPack()), 3350 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 3351 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 3352 this->Designators = new (C) Designator[NumDesignators]; 3353 3354 // Record the initializer itself. 3355 child_range Child = children(); 3356 *Child++ = Init; 3357 3358 // Copy the designators and their subexpressions, computing 3359 // value-dependence along the way. 3360 unsigned IndexIdx = 0; 3361 for (unsigned I = 0; I != NumDesignators; ++I) { 3362 this->Designators[I] = Designators[I]; 3363 3364 if (this->Designators[I].isArrayDesignator()) { 3365 // Compute type- and value-dependence. 3366 Expr *Index = IndexExprs[IndexIdx]; 3367 if (Index->isTypeDependent() || Index->isValueDependent()) 3368 ExprBits.ValueDependent = true; 3369 if (Index->isInstantiationDependent()) 3370 ExprBits.InstantiationDependent = true; 3371 // Propagate unexpanded parameter packs. 3372 if (Index->containsUnexpandedParameterPack()) 3373 ExprBits.ContainsUnexpandedParameterPack = true; 3374 3375 // Copy the index expressions into permanent storage. 3376 *Child++ = IndexExprs[IndexIdx++]; 3377 } else if (this->Designators[I].isArrayRangeDesignator()) { 3378 // Compute type- and value-dependence. 3379 Expr *Start = IndexExprs[IndexIdx]; 3380 Expr *End = IndexExprs[IndexIdx + 1]; 3381 if (Start->isTypeDependent() || Start->isValueDependent() || 3382 End->isTypeDependent() || End->isValueDependent()) { 3383 ExprBits.ValueDependent = true; 3384 ExprBits.InstantiationDependent = true; 3385 } else if (Start->isInstantiationDependent() || 3386 End->isInstantiationDependent()) { 3387 ExprBits.InstantiationDependent = true; 3388 } 3389 3390 // Propagate unexpanded parameter packs. 3391 if (Start->containsUnexpandedParameterPack() || 3392 End->containsUnexpandedParameterPack()) 3393 ExprBits.ContainsUnexpandedParameterPack = true; 3394 3395 // Copy the start/end expressions into permanent storage. 3396 *Child++ = IndexExprs[IndexIdx++]; 3397 *Child++ = IndexExprs[IndexIdx++]; 3398 } 3399 } 3400 3401 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 3402} 3403 3404DesignatedInitExpr * 3405DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 3406 unsigned NumDesignators, 3407 Expr **IndexExprs, unsigned NumIndexExprs, 3408 SourceLocation ColonOrEqualLoc, 3409 bool UsesColonSyntax, Expr *Init) { 3410 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3411 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3412 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 3413 ColonOrEqualLoc, UsesColonSyntax, 3414 IndexExprs, NumIndexExprs, Init); 3415} 3416 3417DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 3418 unsigned NumIndexExprs) { 3419 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3420 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3421 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 3422} 3423 3424void DesignatedInitExpr::setDesignators(ASTContext &C, 3425 const Designator *Desigs, 3426 unsigned NumDesigs) { 3427 Designators = new (C) Designator[NumDesigs]; 3428 NumDesignators = NumDesigs; 3429 for (unsigned I = 0; I != NumDesigs; ++I) 3430 Designators[I] = Desigs[I]; 3431} 3432 3433SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { 3434 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this); 3435 if (size() == 1) 3436 return DIE->getDesignator(0)->getSourceRange(); 3437 return SourceRange(DIE->getDesignator(0)->getStartLocation(), 3438 DIE->getDesignator(size()-1)->getEndLocation()); 3439} 3440 3441SourceRange DesignatedInitExpr::getSourceRange() const { 3442 SourceLocation StartLoc; 3443 Designator &First = 3444 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 3445 if (First.isFieldDesignator()) { 3446 if (GNUSyntax) 3447 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 3448 else 3449 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 3450 } else 3451 StartLoc = 3452 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 3453 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 3454} 3455 3456Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 3457 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 3458 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3459 Ptr += sizeof(DesignatedInitExpr); 3460 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3461 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3462} 3463 3464Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 3465 assert(D.Kind == Designator::ArrayRangeDesignator && 3466 "Requires array range designator"); 3467 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3468 Ptr += sizeof(DesignatedInitExpr); 3469 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3470 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3471} 3472 3473Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 3474 assert(D.Kind == Designator::ArrayRangeDesignator && 3475 "Requires array range designator"); 3476 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3477 Ptr += sizeof(DesignatedInitExpr); 3478 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3479 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 3480} 3481 3482/// \brief Replaces the designator at index @p Idx with the series 3483/// of designators in [First, Last). 3484void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 3485 const Designator *First, 3486 const Designator *Last) { 3487 unsigned NumNewDesignators = Last - First; 3488 if (NumNewDesignators == 0) { 3489 std::copy_backward(Designators + Idx + 1, 3490 Designators + NumDesignators, 3491 Designators + Idx); 3492 --NumNewDesignators; 3493 return; 3494 } else if (NumNewDesignators == 1) { 3495 Designators[Idx] = *First; 3496 return; 3497 } 3498 3499 Designator *NewDesignators 3500 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 3501 std::copy(Designators, Designators + Idx, NewDesignators); 3502 std::copy(First, Last, NewDesignators + Idx); 3503 std::copy(Designators + Idx + 1, Designators + NumDesignators, 3504 NewDesignators + Idx + NumNewDesignators); 3505 Designators = NewDesignators; 3506 NumDesignators = NumDesignators - 1 + NumNewDesignators; 3507} 3508 3509ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 3510 Expr **exprs, unsigned nexprs, 3511 SourceLocation rparenloc) 3512 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 3513 false, false, false, false), 3514 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 3515 Exprs = new (C) Stmt*[nexprs]; 3516 for (unsigned i = 0; i != nexprs; ++i) { 3517 if (exprs[i]->isTypeDependent()) 3518 ExprBits.TypeDependent = true; 3519 if (exprs[i]->isValueDependent()) 3520 ExprBits.ValueDependent = true; 3521 if (exprs[i]->isInstantiationDependent()) 3522 ExprBits.InstantiationDependent = true; 3523 if (exprs[i]->containsUnexpandedParameterPack()) 3524 ExprBits.ContainsUnexpandedParameterPack = true; 3525 3526 Exprs[i] = exprs[i]; 3527 } 3528} 3529 3530const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 3531 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 3532 e = ewc->getSubExpr(); 3533 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e)) 3534 e = m->GetTemporaryExpr(); 3535 e = cast<CXXConstructExpr>(e)->getArg(0); 3536 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3537 e = ice->getSubExpr(); 3538 return cast<OpaqueValueExpr>(e); 3539} 3540 3541PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &Context, EmptyShell sh, 3542 unsigned numSemanticExprs) { 3543 void *buffer = Context.Allocate(sizeof(PseudoObjectExpr) + 3544 (1 + numSemanticExprs) * sizeof(Expr*), 3545 llvm::alignOf<PseudoObjectExpr>()); 3546 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs); 3547} 3548 3549PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs) 3550 : Expr(PseudoObjectExprClass, shell) { 3551 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1; 3552} 3553 3554PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &C, Expr *syntax, 3555 ArrayRef<Expr*> semantics, 3556 unsigned resultIndex) { 3557 assert(syntax && "no syntactic expression!"); 3558 assert(semantics.size() && "no semantic expressions!"); 3559 3560 QualType type; 3561 ExprValueKind VK; 3562 if (resultIndex == NoResult) { 3563 type = C.VoidTy; 3564 VK = VK_RValue; 3565 } else { 3566 assert(resultIndex < semantics.size()); 3567 type = semantics[resultIndex]->getType(); 3568 VK = semantics[resultIndex]->getValueKind(); 3569 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary); 3570 } 3571 3572 void *buffer = C.Allocate(sizeof(PseudoObjectExpr) + 3573 (1 + semantics.size()) * sizeof(Expr*), 3574 llvm::alignOf<PseudoObjectExpr>()); 3575 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics, 3576 resultIndex); 3577} 3578 3579PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK, 3580 Expr *syntax, ArrayRef<Expr*> semantics, 3581 unsigned resultIndex) 3582 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary, 3583 /*filled in at end of ctor*/ false, false, false, false) { 3584 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1; 3585 PseudoObjectExprBits.ResultIndex = resultIndex + 1; 3586 3587 for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) { 3588 Expr *E = (i == 0 ? syntax : semantics[i-1]); 3589 getSubExprsBuffer()[i] = E; 3590 3591 if (E->isTypeDependent()) 3592 ExprBits.TypeDependent = true; 3593 if (E->isValueDependent()) 3594 ExprBits.ValueDependent = true; 3595 if (E->isInstantiationDependent()) 3596 ExprBits.InstantiationDependent = true; 3597 if (E->containsUnexpandedParameterPack()) 3598 ExprBits.ContainsUnexpandedParameterPack = true; 3599 3600 if (isa<OpaqueValueExpr>(E)) 3601 assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != 0 && 3602 "opaque-value semantic expressions for pseudo-object " 3603 "operations must have sources"); 3604 } 3605} 3606 3607//===----------------------------------------------------------------------===// 3608// ExprIterator. 3609//===----------------------------------------------------------------------===// 3610 3611Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 3612Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 3613Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 3614const Expr* ConstExprIterator::operator[](size_t idx) const { 3615 return cast<Expr>(I[idx]); 3616} 3617const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 3618const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 3619 3620//===----------------------------------------------------------------------===// 3621// Child Iterators for iterating over subexpressions/substatements 3622//===----------------------------------------------------------------------===// 3623 3624// UnaryExprOrTypeTraitExpr 3625Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 3626 // If this is of a type and the type is a VLA type (and not a typedef), the 3627 // size expression of the VLA needs to be treated as an executable expression. 3628 // Why isn't this weirdness documented better in StmtIterator? 3629 if (isArgumentType()) { 3630 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 3631 getArgumentType().getTypePtr())) 3632 return child_range(child_iterator(T), child_iterator()); 3633 return child_range(); 3634 } 3635 return child_range(&Argument.Ex, &Argument.Ex + 1); 3636} 3637 3638// ObjCMessageExpr 3639Stmt::child_range ObjCMessageExpr::children() { 3640 Stmt **begin; 3641 if (getReceiverKind() == Instance) 3642 begin = reinterpret_cast<Stmt **>(this + 1); 3643 else 3644 begin = reinterpret_cast<Stmt **>(getArgs()); 3645 return child_range(begin, 3646 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 3647} 3648 3649// Blocks 3650BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3651 SourceLocation l, bool ByRef, 3652 bool constAdded) 3653 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false, false, 3654 d->isParameterPack()), 3655 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded) 3656{ 3657 bool TypeDependent = false; 3658 bool ValueDependent = false; 3659 bool InstantiationDependent = false; 3660 computeDeclRefDependence(D->getASTContext(), D, getType(), TypeDependent, 3661 ValueDependent, InstantiationDependent); 3662 ExprBits.TypeDependent = TypeDependent; 3663 ExprBits.ValueDependent = ValueDependent; 3664 ExprBits.InstantiationDependent = InstantiationDependent; 3665} 3666 3667ObjCArrayLiteral::ObjCArrayLiteral(llvm::ArrayRef<Expr *> Elements, 3668 QualType T, ObjCMethodDecl *Method, 3669 SourceRange SR) 3670 : Expr(ObjCArrayLiteralClass, T, VK_RValue, OK_Ordinary, 3671 false, false, false, false), 3672 NumElements(Elements.size()), Range(SR), ArrayWithObjectsMethod(Method) 3673{ 3674 Expr **SaveElements = getElements(); 3675 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 3676 if (Elements[I]->isTypeDependent() || Elements[I]->isValueDependent()) 3677 ExprBits.ValueDependent = true; 3678 if (Elements[I]->isInstantiationDependent()) 3679 ExprBits.InstantiationDependent = true; 3680 if (Elements[I]->containsUnexpandedParameterPack()) 3681 ExprBits.ContainsUnexpandedParameterPack = true; 3682 3683 SaveElements[I] = Elements[I]; 3684 } 3685} 3686 3687ObjCArrayLiteral *ObjCArrayLiteral::Create(ASTContext &C, 3688 llvm::ArrayRef<Expr *> Elements, 3689 QualType T, ObjCMethodDecl * Method, 3690 SourceRange SR) { 3691 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3692 + Elements.size() * sizeof(Expr *)); 3693 return new (Mem) ObjCArrayLiteral(Elements, T, Method, SR); 3694} 3695 3696ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(ASTContext &C, 3697 unsigned NumElements) { 3698 3699 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3700 + NumElements * sizeof(Expr *)); 3701 return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements); 3702} 3703 3704ObjCDictionaryLiteral::ObjCDictionaryLiteral( 3705 ArrayRef<ObjCDictionaryElement> VK, 3706 bool HasPackExpansions, 3707 QualType T, ObjCMethodDecl *method, 3708 SourceRange SR) 3709 : Expr(ObjCDictionaryLiteralClass, T, VK_RValue, OK_Ordinary, false, false, 3710 false, false), 3711 NumElements(VK.size()), HasPackExpansions(HasPackExpansions), Range(SR), 3712 DictWithObjectsMethod(method) 3713{ 3714 KeyValuePair *KeyValues = getKeyValues(); 3715 ExpansionData *Expansions = getExpansionData(); 3716 for (unsigned I = 0; I < NumElements; I++) { 3717 if (VK[I].Key->isTypeDependent() || VK[I].Key->isValueDependent() || 3718 VK[I].Value->isTypeDependent() || VK[I].Value->isValueDependent()) 3719 ExprBits.ValueDependent = true; 3720 if (VK[I].Key->isInstantiationDependent() || 3721 VK[I].Value->isInstantiationDependent()) 3722 ExprBits.InstantiationDependent = true; 3723 if (VK[I].EllipsisLoc.isInvalid() && 3724 (VK[I].Key->containsUnexpandedParameterPack() || 3725 VK[I].Value->containsUnexpandedParameterPack())) 3726 ExprBits.ContainsUnexpandedParameterPack = true; 3727 3728 KeyValues[I].Key = VK[I].Key; 3729 KeyValues[I].Value = VK[I].Value; 3730 if (Expansions) { 3731 Expansions[I].EllipsisLoc = VK[I].EllipsisLoc; 3732 if (VK[I].NumExpansions) 3733 Expansions[I].NumExpansionsPlusOne = *VK[I].NumExpansions + 1; 3734 else 3735 Expansions[I].NumExpansionsPlusOne = 0; 3736 } 3737 } 3738} 3739 3740ObjCDictionaryLiteral * 3741ObjCDictionaryLiteral::Create(ASTContext &C, 3742 ArrayRef<ObjCDictionaryElement> VK, 3743 bool HasPackExpansions, 3744 QualType T, ObjCMethodDecl *method, 3745 SourceRange SR) { 3746 unsigned ExpansionsSize = 0; 3747 if (HasPackExpansions) 3748 ExpansionsSize = sizeof(ExpansionData) * VK.size(); 3749 3750 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3751 sizeof(KeyValuePair) * VK.size() + ExpansionsSize); 3752 return new (Mem) ObjCDictionaryLiteral(VK, HasPackExpansions, T, method, SR); 3753} 3754 3755ObjCDictionaryLiteral * 3756ObjCDictionaryLiteral::CreateEmpty(ASTContext &C, unsigned NumElements, 3757 bool HasPackExpansions) { 3758 unsigned ExpansionsSize = 0; 3759 if (HasPackExpansions) 3760 ExpansionsSize = sizeof(ExpansionData) * NumElements; 3761 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3762 sizeof(KeyValuePair) * NumElements + ExpansionsSize); 3763 return new (Mem) ObjCDictionaryLiteral(EmptyShell(), NumElements, 3764 HasPackExpansions); 3765} 3766 3767ObjCSubscriptRefExpr *ObjCSubscriptRefExpr::Create(ASTContext &C, 3768 Expr *base, 3769 Expr *key, QualType T, 3770 ObjCMethodDecl *getMethod, 3771 ObjCMethodDecl *setMethod, 3772 SourceLocation RB) { 3773 void *Mem = C.Allocate(sizeof(ObjCSubscriptRefExpr)); 3774 return new (Mem) ObjCSubscriptRefExpr(base, key, T, VK_LValue, 3775 OK_ObjCSubscript, 3776 getMethod, setMethod, RB); 3777} 3778 3779AtomicExpr::AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, 3780 QualType t, AtomicOp op, SourceLocation RP) 3781 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 3782 false, false, false, false), 3783 NumSubExprs(nexpr), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) 3784{ 3785 for (unsigned i = 0; i < nexpr; i++) { 3786 if (args[i]->isTypeDependent()) 3787 ExprBits.TypeDependent = true; 3788 if (args[i]->isValueDependent()) 3789 ExprBits.ValueDependent = true; 3790 if (args[i]->isInstantiationDependent()) 3791 ExprBits.InstantiationDependent = true; 3792 if (args[i]->containsUnexpandedParameterPack()) 3793 ExprBits.ContainsUnexpandedParameterPack = true; 3794 3795 SubExprs[i] = args[i]; 3796 } 3797} 3798