Expr.cpp revision 4e4d08403ca5cfd4d558fa2936215d3a4e5a528d
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.getLangOpts().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, bool RefersToEnclosingLocal, 267 const DeclarationNameInfo &NameInfo, 268 NamedDecl *FoundD, 269 const TemplateArgumentListInfo *TemplateArgs, 270 QualType T, ExprValueKind VK) 271 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 272 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 273 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0; 274 if (QualifierLoc) 275 getInternalQualifierLoc() = QualifierLoc; 276 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0; 277 if (FoundD) 278 getInternalFoundDecl() = FoundD; 279 DeclRefExprBits.HasTemplateKWAndArgsInfo 280 = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0; 281 DeclRefExprBits.RefersToEnclosingLocal = RefersToEnclosingLocal; 282 if (TemplateArgs) { 283 bool Dependent = false; 284 bool InstantiationDependent = false; 285 bool ContainsUnexpandedParameterPack = false; 286 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *TemplateArgs, 287 Dependent, 288 InstantiationDependent, 289 ContainsUnexpandedParameterPack); 290 if (InstantiationDependent) 291 setInstantiationDependent(true); 292 } else if (TemplateKWLoc.isValid()) { 293 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 294 } 295 DeclRefExprBits.HadMultipleCandidates = 0; 296 297 computeDependence(Ctx); 298} 299 300DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 301 NestedNameSpecifierLoc QualifierLoc, 302 SourceLocation TemplateKWLoc, 303 ValueDecl *D, 304 bool RefersToEnclosingLocal, 305 SourceLocation NameLoc, 306 QualType T, 307 ExprValueKind VK, 308 NamedDecl *FoundD, 309 const TemplateArgumentListInfo *TemplateArgs) { 310 return Create(Context, QualifierLoc, TemplateKWLoc, D, 311 RefersToEnclosingLocal, 312 DeclarationNameInfo(D->getDeclName(), NameLoc), 313 T, VK, FoundD, TemplateArgs); 314} 315 316DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 317 NestedNameSpecifierLoc QualifierLoc, 318 SourceLocation TemplateKWLoc, 319 ValueDecl *D, 320 bool RefersToEnclosingLocal, 321 const DeclarationNameInfo &NameInfo, 322 QualType T, 323 ExprValueKind VK, 324 NamedDecl *FoundD, 325 const TemplateArgumentListInfo *TemplateArgs) { 326 // Filter out cases where the found Decl is the same as the value refenenced. 327 if (D == FoundD) 328 FoundD = 0; 329 330 std::size_t Size = sizeof(DeclRefExpr); 331 if (QualifierLoc != 0) 332 Size += sizeof(NestedNameSpecifierLoc); 333 if (FoundD) 334 Size += sizeof(NamedDecl *); 335 if (TemplateArgs) 336 Size += ASTTemplateKWAndArgsInfo::sizeFor(TemplateArgs->size()); 337 else if (TemplateKWLoc.isValid()) 338 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 339 340 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 341 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D, 342 RefersToEnclosingLocal, 343 NameInfo, FoundD, TemplateArgs, T, VK); 344} 345 346DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 347 bool HasQualifier, 348 bool HasFoundDecl, 349 bool HasTemplateKWAndArgsInfo, 350 unsigned NumTemplateArgs) { 351 std::size_t Size = sizeof(DeclRefExpr); 352 if (HasQualifier) 353 Size += sizeof(NestedNameSpecifierLoc); 354 if (HasFoundDecl) 355 Size += sizeof(NamedDecl *); 356 if (HasTemplateKWAndArgsInfo) 357 Size += ASTTemplateKWAndArgsInfo::sizeFor(NumTemplateArgs); 358 359 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 360 return new (Mem) DeclRefExpr(EmptyShell()); 361} 362 363SourceRange DeclRefExpr::getSourceRange() const { 364 SourceRange R = getNameInfo().getSourceRange(); 365 if (hasQualifier()) 366 R.setBegin(getQualifierLoc().getBeginLoc()); 367 if (hasExplicitTemplateArgs()) 368 R.setEnd(getRAngleLoc()); 369 return R; 370} 371SourceLocation DeclRefExpr::getLocStart() const { 372 if (hasQualifier()) 373 return getQualifierLoc().getBeginLoc(); 374 return getNameInfo().getLocStart(); 375} 376SourceLocation DeclRefExpr::getLocEnd() const { 377 if (hasExplicitTemplateArgs()) 378 return getRAngleLoc(); 379 return getNameInfo().getLocEnd(); 380} 381 382// FIXME: Maybe this should use DeclPrinter with a special "print predefined 383// expr" policy instead. 384std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 385 ASTContext &Context = CurrentDecl->getASTContext(); 386 387 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 388 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 389 return FD->getNameAsString(); 390 391 SmallString<256> Name; 392 llvm::raw_svector_ostream Out(Name); 393 394 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 395 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 396 Out << "virtual "; 397 if (MD->isStatic()) 398 Out << "static "; 399 } 400 401 PrintingPolicy Policy(Context.getLangOpts()); 402 403 std::string Proto = FD->getQualifiedNameAsString(Policy); 404 405 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 406 const FunctionProtoType *FT = 0; 407 if (FD->hasWrittenPrototype()) 408 FT = dyn_cast<FunctionProtoType>(AFT); 409 410 Proto += "("; 411 if (FT) { 412 llvm::raw_string_ostream POut(Proto); 413 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 414 if (i) POut << ", "; 415 std::string Param; 416 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 417 POut << Param; 418 } 419 420 if (FT->isVariadic()) { 421 if (FD->getNumParams()) POut << ", "; 422 POut << "..."; 423 } 424 } 425 Proto += ")"; 426 427 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 428 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 429 if (ThisQuals.hasConst()) 430 Proto += " const"; 431 if (ThisQuals.hasVolatile()) 432 Proto += " volatile"; 433 } 434 435 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 436 AFT->getResultType().getAsStringInternal(Proto, Policy); 437 438 Out << Proto; 439 440 Out.flush(); 441 return Name.str().str(); 442 } 443 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 444 SmallString<256> Name; 445 llvm::raw_svector_ostream Out(Name); 446 Out << (MD->isInstanceMethod() ? '-' : '+'); 447 Out << '['; 448 449 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 450 // a null check to avoid a crash. 451 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 452 Out << *ID; 453 454 if (const ObjCCategoryImplDecl *CID = 455 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 456 Out << '(' << *CID << ')'; 457 458 Out << ' '; 459 Out << MD->getSelector().getAsString(); 460 Out << ']'; 461 462 Out.flush(); 463 return Name.str().str(); 464 } 465 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 466 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 467 return "top level"; 468 } 469 return ""; 470} 471 472void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 473 if (hasAllocation()) 474 C.Deallocate(pVal); 475 476 BitWidth = Val.getBitWidth(); 477 unsigned NumWords = Val.getNumWords(); 478 const uint64_t* Words = Val.getRawData(); 479 if (NumWords > 1) { 480 pVal = new (C) uint64_t[NumWords]; 481 std::copy(Words, Words + NumWords, pVal); 482 } else if (NumWords == 1) 483 VAL = Words[0]; 484 else 485 VAL = 0; 486} 487 488IntegerLiteral * 489IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 490 QualType type, SourceLocation l) { 491 return new (C) IntegerLiteral(C, V, type, l); 492} 493 494IntegerLiteral * 495IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 496 return new (C) IntegerLiteral(Empty); 497} 498 499FloatingLiteral * 500FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 501 bool isexact, QualType Type, SourceLocation L) { 502 return new (C) FloatingLiteral(C, V, isexact, Type, L); 503} 504 505FloatingLiteral * 506FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 507 return new (C) FloatingLiteral(C, Empty); 508} 509 510/// getValueAsApproximateDouble - This returns the value as an inaccurate 511/// double. Note that this may cause loss of precision, but is useful for 512/// debugging dumps, etc. 513double FloatingLiteral::getValueAsApproximateDouble() const { 514 llvm::APFloat V = getValue(); 515 bool ignored; 516 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 517 &ignored); 518 return V.convertToDouble(); 519} 520 521int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) { 522 int CharByteWidth = 0; 523 switch(k) { 524 case Ascii: 525 case UTF8: 526 CharByteWidth = target.getCharWidth(); 527 break; 528 case Wide: 529 CharByteWidth = target.getWCharWidth(); 530 break; 531 case UTF16: 532 CharByteWidth = target.getChar16Width(); 533 break; 534 case UTF32: 535 CharByteWidth = target.getChar32Width(); 536 break; 537 } 538 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 539 CharByteWidth /= 8; 540 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 541 && "character byte widths supported are 1, 2, and 4 only"); 542 return CharByteWidth; 543} 544 545StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str, 546 StringKind Kind, bool Pascal, QualType Ty, 547 const SourceLocation *Loc, 548 unsigned NumStrs) { 549 // Allocate enough space for the StringLiteral plus an array of locations for 550 // any concatenated string tokens. 551 void *Mem = C.Allocate(sizeof(StringLiteral)+ 552 sizeof(SourceLocation)*(NumStrs-1), 553 llvm::alignOf<StringLiteral>()); 554 StringLiteral *SL = new (Mem) StringLiteral(Ty); 555 556 // OPTIMIZE: could allocate this appended to the StringLiteral. 557 SL->setString(C,Str,Kind,Pascal); 558 559 SL->TokLocs[0] = Loc[0]; 560 SL->NumConcatenated = NumStrs; 561 562 if (NumStrs != 1) 563 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 564 return SL; 565} 566 567StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 568 void *Mem = C.Allocate(sizeof(StringLiteral)+ 569 sizeof(SourceLocation)*(NumStrs-1), 570 llvm::alignOf<StringLiteral>()); 571 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 572 SL->CharByteWidth = 0; 573 SL->Length = 0; 574 SL->NumConcatenated = NumStrs; 575 return SL; 576} 577 578void StringLiteral::setString(ASTContext &C, StringRef Str, 579 StringKind Kind, bool IsPascal) { 580 //FIXME: we assume that the string data comes from a target that uses the same 581 // code unit size and endianess for the type of string. 582 this->Kind = Kind; 583 this->IsPascal = IsPascal; 584 585 CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind); 586 assert((Str.size()%CharByteWidth == 0) 587 && "size of data must be multiple of CharByteWidth"); 588 Length = Str.size()/CharByteWidth; 589 590 switch(CharByteWidth) { 591 case 1: { 592 char *AStrData = new (C) char[Length]; 593 std::memcpy(AStrData,Str.data(),Str.size()); 594 StrData.asChar = AStrData; 595 break; 596 } 597 case 2: { 598 uint16_t *AStrData = new (C) uint16_t[Length]; 599 std::memcpy(AStrData,Str.data(),Str.size()); 600 StrData.asUInt16 = AStrData; 601 break; 602 } 603 case 4: { 604 uint32_t *AStrData = new (C) uint32_t[Length]; 605 std::memcpy(AStrData,Str.data(),Str.size()); 606 StrData.asUInt32 = AStrData; 607 break; 608 } 609 default: 610 assert(false && "unsupported CharByteWidth"); 611 } 612} 613 614/// getLocationOfByte - Return a source location that points to the specified 615/// byte of this string literal. 616/// 617/// Strings are amazingly complex. They can be formed from multiple tokens and 618/// can have escape sequences in them in addition to the usual trigraph and 619/// escaped newline business. This routine handles this complexity. 620/// 621SourceLocation StringLiteral:: 622getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 623 const LangOptions &Features, const TargetInfo &Target) const { 624 assert(Kind == StringLiteral::Ascii && "This only works for ASCII strings"); 625 626 // Loop over all of the tokens in this string until we find the one that 627 // contains the byte we're looking for. 628 unsigned TokNo = 0; 629 while (1) { 630 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 631 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 632 633 // Get the spelling of the string so that we can get the data that makes up 634 // the string literal, not the identifier for the macro it is potentially 635 // expanded through. 636 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 637 638 // Re-lex the token to get its length and original spelling. 639 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 640 bool Invalid = false; 641 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 642 if (Invalid) 643 return StrTokSpellingLoc; 644 645 const char *StrData = Buffer.data()+LocInfo.second; 646 647 // Create a langops struct and enable trigraphs. This is sufficient for 648 // relexing tokens. 649 LangOptions LangOpts; 650 LangOpts.Trigraphs = true; 651 652 // Create a lexer starting at the beginning of this token. 653 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 654 Buffer.end()); 655 Token TheTok; 656 TheLexer.LexFromRawLexer(TheTok); 657 658 // Use the StringLiteralParser to compute the length of the string in bytes. 659 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 660 unsigned TokNumBytes = SLP.GetStringLength(); 661 662 // If the byte is in this token, return the location of the byte. 663 if (ByteNo < TokNumBytes || 664 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) { 665 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 666 667 // Now that we know the offset of the token in the spelling, use the 668 // preprocessor to get the offset in the original source. 669 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 670 } 671 672 // Move to the next string token. 673 ++TokNo; 674 ByteNo -= TokNumBytes; 675 } 676} 677 678 679 680/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 681/// corresponds to, e.g. "sizeof" or "[pre]++". 682const char *UnaryOperator::getOpcodeStr(Opcode Op) { 683 switch (Op) { 684 case UO_PostInc: return "++"; 685 case UO_PostDec: return "--"; 686 case UO_PreInc: return "++"; 687 case UO_PreDec: return "--"; 688 case UO_AddrOf: return "&"; 689 case UO_Deref: return "*"; 690 case UO_Plus: return "+"; 691 case UO_Minus: return "-"; 692 case UO_Not: return "~"; 693 case UO_LNot: return "!"; 694 case UO_Real: return "__real"; 695 case UO_Imag: return "__imag"; 696 case UO_Extension: return "__extension__"; 697 } 698 llvm_unreachable("Unknown unary operator"); 699} 700 701UnaryOperatorKind 702UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 703 switch (OO) { 704 default: llvm_unreachable("No unary operator for overloaded function"); 705 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 706 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 707 case OO_Amp: return UO_AddrOf; 708 case OO_Star: return UO_Deref; 709 case OO_Plus: return UO_Plus; 710 case OO_Minus: return UO_Minus; 711 case OO_Tilde: return UO_Not; 712 case OO_Exclaim: return UO_LNot; 713 } 714} 715 716OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 717 switch (Opc) { 718 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 719 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 720 case UO_AddrOf: return OO_Amp; 721 case UO_Deref: return OO_Star; 722 case UO_Plus: return OO_Plus; 723 case UO_Minus: return OO_Minus; 724 case UO_Not: return OO_Tilde; 725 case UO_LNot: return OO_Exclaim; 726 default: return OO_None; 727 } 728} 729 730 731//===----------------------------------------------------------------------===// 732// Postfix Operators. 733//===----------------------------------------------------------------------===// 734 735CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 736 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 737 SourceLocation rparenloc) 738 : Expr(SC, t, VK, OK_Ordinary, 739 fn->isTypeDependent(), 740 fn->isValueDependent(), 741 fn->isInstantiationDependent(), 742 fn->containsUnexpandedParameterPack()), 743 NumArgs(numargs) { 744 745 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 746 SubExprs[FN] = fn; 747 for (unsigned i = 0; i != numargs; ++i) { 748 if (args[i]->isTypeDependent()) 749 ExprBits.TypeDependent = true; 750 if (args[i]->isValueDependent()) 751 ExprBits.ValueDependent = true; 752 if (args[i]->isInstantiationDependent()) 753 ExprBits.InstantiationDependent = true; 754 if (args[i]->containsUnexpandedParameterPack()) 755 ExprBits.ContainsUnexpandedParameterPack = true; 756 757 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 758 } 759 760 CallExprBits.NumPreArgs = NumPreArgs; 761 RParenLoc = rparenloc; 762} 763 764CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 765 QualType t, ExprValueKind VK, SourceLocation rparenloc) 766 : Expr(CallExprClass, t, VK, OK_Ordinary, 767 fn->isTypeDependent(), 768 fn->isValueDependent(), 769 fn->isInstantiationDependent(), 770 fn->containsUnexpandedParameterPack()), 771 NumArgs(numargs) { 772 773 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 774 SubExprs[FN] = fn; 775 for (unsigned i = 0; i != numargs; ++i) { 776 if (args[i]->isTypeDependent()) 777 ExprBits.TypeDependent = true; 778 if (args[i]->isValueDependent()) 779 ExprBits.ValueDependent = true; 780 if (args[i]->isInstantiationDependent()) 781 ExprBits.InstantiationDependent = true; 782 if (args[i]->containsUnexpandedParameterPack()) 783 ExprBits.ContainsUnexpandedParameterPack = true; 784 785 SubExprs[i+PREARGS_START] = args[i]; 786 } 787 788 CallExprBits.NumPreArgs = 0; 789 RParenLoc = rparenloc; 790} 791 792CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 793 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 794 // FIXME: Why do we allocate this? 795 SubExprs = new (C) Stmt*[PREARGS_START]; 796 CallExprBits.NumPreArgs = 0; 797} 798 799CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 800 EmptyShell Empty) 801 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 802 // FIXME: Why do we allocate this? 803 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 804 CallExprBits.NumPreArgs = NumPreArgs; 805} 806 807Decl *CallExpr::getCalleeDecl() { 808 Expr *CEE = getCallee()->IgnoreParenImpCasts(); 809 810 while (SubstNonTypeTemplateParmExpr *NTTP 811 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) { 812 CEE = NTTP->getReplacement()->IgnoreParenCasts(); 813 } 814 815 // If we're calling a dereference, look at the pointer instead. 816 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 817 if (BO->isPtrMemOp()) 818 CEE = BO->getRHS()->IgnoreParenCasts(); 819 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 820 if (UO->getOpcode() == UO_Deref) 821 CEE = UO->getSubExpr()->IgnoreParenCasts(); 822 } 823 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 824 return DRE->getDecl(); 825 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 826 return ME->getMemberDecl(); 827 828 return 0; 829} 830 831FunctionDecl *CallExpr::getDirectCallee() { 832 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 833} 834 835/// setNumArgs - This changes the number of arguments present in this call. 836/// Any orphaned expressions are deleted by this, and any new operands are set 837/// to null. 838void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 839 // No change, just return. 840 if (NumArgs == getNumArgs()) return; 841 842 // If shrinking # arguments, just delete the extras and forgot them. 843 if (NumArgs < getNumArgs()) { 844 this->NumArgs = NumArgs; 845 return; 846 } 847 848 // Otherwise, we are growing the # arguments. New an bigger argument array. 849 unsigned NumPreArgs = getNumPreArgs(); 850 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 851 // Copy over args. 852 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 853 NewSubExprs[i] = SubExprs[i]; 854 // Null out new args. 855 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 856 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 857 NewSubExprs[i] = 0; 858 859 if (SubExprs) C.Deallocate(SubExprs); 860 SubExprs = NewSubExprs; 861 this->NumArgs = NumArgs; 862} 863 864/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 865/// not, return 0. 866unsigned CallExpr::isBuiltinCall() const { 867 // All simple function calls (e.g. func()) are implicitly cast to pointer to 868 // function. As a result, we try and obtain the DeclRefExpr from the 869 // ImplicitCastExpr. 870 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 871 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 872 return 0; 873 874 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 875 if (!DRE) 876 return 0; 877 878 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 879 if (!FDecl) 880 return 0; 881 882 if (!FDecl->getIdentifier()) 883 return 0; 884 885 return FDecl->getBuiltinID(); 886} 887 888QualType CallExpr::getCallReturnType() const { 889 QualType CalleeType = getCallee()->getType(); 890 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 891 CalleeType = FnTypePtr->getPointeeType(); 892 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 893 CalleeType = BPT->getPointeeType(); 894 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) 895 // This should never be overloaded and so should never return null. 896 CalleeType = Expr::findBoundMemberType(getCallee()); 897 898 const FunctionType *FnType = CalleeType->castAs<FunctionType>(); 899 return FnType->getResultType(); 900} 901 902SourceRange CallExpr::getSourceRange() const { 903 if (isa<CXXOperatorCallExpr>(this)) 904 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 905 906 SourceLocation begin = getCallee()->getLocStart(); 907 if (begin.isInvalid() && getNumArgs() > 0) 908 begin = getArg(0)->getLocStart(); 909 SourceLocation end = getRParenLoc(); 910 if (end.isInvalid() && getNumArgs() > 0) 911 end = getArg(getNumArgs() - 1)->getLocEnd(); 912 return SourceRange(begin, end); 913} 914SourceLocation CallExpr::getLocStart() const { 915 if (isa<CXXOperatorCallExpr>(this)) 916 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getBegin(); 917 918 SourceLocation begin = getCallee()->getLocStart(); 919 if (begin.isInvalid() && getNumArgs() > 0) 920 begin = getArg(0)->getLocStart(); 921 return begin; 922} 923SourceLocation CallExpr::getLocEnd() const { 924 if (isa<CXXOperatorCallExpr>(this)) 925 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getEnd(); 926 927 SourceLocation end = getRParenLoc(); 928 if (end.isInvalid() && getNumArgs() > 0) 929 end = getArg(getNumArgs() - 1)->getLocEnd(); 930 return end; 931} 932 933OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 934 SourceLocation OperatorLoc, 935 TypeSourceInfo *tsi, 936 OffsetOfNode* compsPtr, unsigned numComps, 937 Expr** exprsPtr, unsigned numExprs, 938 SourceLocation RParenLoc) { 939 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 940 sizeof(OffsetOfNode) * numComps + 941 sizeof(Expr*) * numExprs); 942 943 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 944 exprsPtr, numExprs, RParenLoc); 945} 946 947OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 948 unsigned numComps, unsigned numExprs) { 949 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 950 sizeof(OffsetOfNode) * numComps + 951 sizeof(Expr*) * numExprs); 952 return new (Mem) OffsetOfExpr(numComps, numExprs); 953} 954 955OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 956 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 957 OffsetOfNode* compsPtr, unsigned numComps, 958 Expr** exprsPtr, unsigned numExprs, 959 SourceLocation RParenLoc) 960 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 961 /*TypeDependent=*/false, 962 /*ValueDependent=*/tsi->getType()->isDependentType(), 963 tsi->getType()->isInstantiationDependentType(), 964 tsi->getType()->containsUnexpandedParameterPack()), 965 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 966 NumComps(numComps), NumExprs(numExprs) 967{ 968 for(unsigned i = 0; i < numComps; ++i) { 969 setComponent(i, compsPtr[i]); 970 } 971 972 for(unsigned i = 0; i < numExprs; ++i) { 973 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 974 ExprBits.ValueDependent = true; 975 if (exprsPtr[i]->containsUnexpandedParameterPack()) 976 ExprBits.ContainsUnexpandedParameterPack = true; 977 978 setIndexExpr(i, exprsPtr[i]); 979 } 980} 981 982IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 983 assert(getKind() == Field || getKind() == Identifier); 984 if (getKind() == Field) 985 return getField()->getIdentifier(); 986 987 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 988} 989 990MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 991 NestedNameSpecifierLoc QualifierLoc, 992 SourceLocation TemplateKWLoc, 993 ValueDecl *memberdecl, 994 DeclAccessPair founddecl, 995 DeclarationNameInfo nameinfo, 996 const TemplateArgumentListInfo *targs, 997 QualType ty, 998 ExprValueKind vk, 999 ExprObjectKind ok) { 1000 std::size_t Size = sizeof(MemberExpr); 1001 1002 bool hasQualOrFound = (QualifierLoc || 1003 founddecl.getDecl() != memberdecl || 1004 founddecl.getAccess() != memberdecl->getAccess()); 1005 if (hasQualOrFound) 1006 Size += sizeof(MemberNameQualifier); 1007 1008 if (targs) 1009 Size += ASTTemplateKWAndArgsInfo::sizeFor(targs->size()); 1010 else if (TemplateKWLoc.isValid()) 1011 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 1012 1013 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 1014 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 1015 ty, vk, ok); 1016 1017 if (hasQualOrFound) { 1018 // FIXME: Wrong. We should be looking at the member declaration we found. 1019 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 1020 E->setValueDependent(true); 1021 E->setTypeDependent(true); 1022 E->setInstantiationDependent(true); 1023 } 1024 else if (QualifierLoc && 1025 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) 1026 E->setInstantiationDependent(true); 1027 1028 E->HasQualifierOrFoundDecl = true; 1029 1030 MemberNameQualifier *NQ = E->getMemberQualifier(); 1031 NQ->QualifierLoc = QualifierLoc; 1032 NQ->FoundDecl = founddecl; 1033 } 1034 1035 E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid()); 1036 1037 if (targs) { 1038 bool Dependent = false; 1039 bool InstantiationDependent = false; 1040 bool ContainsUnexpandedParameterPack = false; 1041 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *targs, 1042 Dependent, 1043 InstantiationDependent, 1044 ContainsUnexpandedParameterPack); 1045 if (InstantiationDependent) 1046 E->setInstantiationDependent(true); 1047 } else if (TemplateKWLoc.isValid()) { 1048 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 1049 } 1050 1051 return E; 1052} 1053 1054SourceRange MemberExpr::getSourceRange() const { 1055 return SourceRange(getLocStart(), getLocEnd()); 1056} 1057SourceLocation MemberExpr::getLocStart() const { 1058 if (isImplicitAccess()) { 1059 if (hasQualifier()) 1060 return getQualifierLoc().getBeginLoc(); 1061 return MemberLoc; 1062 } 1063 1064 // FIXME: We don't want this to happen. Rather, we should be able to 1065 // detect all kinds of implicit accesses more cleanly. 1066 SourceLocation BaseStartLoc = getBase()->getLocStart(); 1067 if (BaseStartLoc.isValid()) 1068 return BaseStartLoc; 1069 return MemberLoc; 1070} 1071SourceLocation MemberExpr::getLocEnd() const { 1072 if (hasExplicitTemplateArgs()) 1073 return getRAngleLoc(); 1074 return getMemberNameInfo().getEndLoc(); 1075} 1076 1077void CastExpr::CheckCastConsistency() const { 1078 switch (getCastKind()) { 1079 case CK_DerivedToBase: 1080 case CK_UncheckedDerivedToBase: 1081 case CK_DerivedToBaseMemberPointer: 1082 case CK_BaseToDerived: 1083 case CK_BaseToDerivedMemberPointer: 1084 assert(!path_empty() && "Cast kind should have a base path!"); 1085 break; 1086 1087 case CK_CPointerToObjCPointerCast: 1088 assert(getType()->isObjCObjectPointerType()); 1089 assert(getSubExpr()->getType()->isPointerType()); 1090 goto CheckNoBasePath; 1091 1092 case CK_BlockPointerToObjCPointerCast: 1093 assert(getType()->isObjCObjectPointerType()); 1094 assert(getSubExpr()->getType()->isBlockPointerType()); 1095 goto CheckNoBasePath; 1096 1097 case CK_ReinterpretMemberPointer: 1098 assert(getType()->isMemberPointerType()); 1099 assert(getSubExpr()->getType()->isMemberPointerType()); 1100 goto CheckNoBasePath; 1101 1102 case CK_BitCast: 1103 // Arbitrary casts to C pointer types count as bitcasts. 1104 // Otherwise, we should only have block and ObjC pointer casts 1105 // here if they stay within the type kind. 1106 if (!getType()->isPointerType()) { 1107 assert(getType()->isObjCObjectPointerType() == 1108 getSubExpr()->getType()->isObjCObjectPointerType()); 1109 assert(getType()->isBlockPointerType() == 1110 getSubExpr()->getType()->isBlockPointerType()); 1111 } 1112 goto CheckNoBasePath; 1113 1114 case CK_AnyPointerToBlockPointerCast: 1115 assert(getType()->isBlockPointerType()); 1116 assert(getSubExpr()->getType()->isAnyPointerType() && 1117 !getSubExpr()->getType()->isBlockPointerType()); 1118 goto CheckNoBasePath; 1119 1120 case CK_CopyAndAutoreleaseBlockObject: 1121 assert(getType()->isBlockPointerType()); 1122 assert(getSubExpr()->getType()->isBlockPointerType()); 1123 goto CheckNoBasePath; 1124 1125 // These should not have an inheritance path. 1126 case CK_Dynamic: 1127 case CK_ToUnion: 1128 case CK_ArrayToPointerDecay: 1129 case CK_FunctionToPointerDecay: 1130 case CK_NullToMemberPointer: 1131 case CK_NullToPointer: 1132 case CK_ConstructorConversion: 1133 case CK_IntegralToPointer: 1134 case CK_PointerToIntegral: 1135 case CK_ToVoid: 1136 case CK_VectorSplat: 1137 case CK_IntegralCast: 1138 case CK_IntegralToFloating: 1139 case CK_FloatingToIntegral: 1140 case CK_FloatingCast: 1141 case CK_ObjCObjectLValueCast: 1142 case CK_FloatingRealToComplex: 1143 case CK_FloatingComplexToReal: 1144 case CK_FloatingComplexCast: 1145 case CK_FloatingComplexToIntegralComplex: 1146 case CK_IntegralRealToComplex: 1147 case CK_IntegralComplexToReal: 1148 case CK_IntegralComplexCast: 1149 case CK_IntegralComplexToFloatingComplex: 1150 case CK_ARCProduceObject: 1151 case CK_ARCConsumeObject: 1152 case CK_ARCReclaimReturnedObject: 1153 case CK_ARCExtendBlockObject: 1154 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 1155 goto CheckNoBasePath; 1156 1157 case CK_Dependent: 1158 case CK_LValueToRValue: 1159 case CK_NoOp: 1160 case CK_AtomicToNonAtomic: 1161 case CK_NonAtomicToAtomic: 1162 case CK_PointerToBoolean: 1163 case CK_IntegralToBoolean: 1164 case CK_FloatingToBoolean: 1165 case CK_MemberPointerToBoolean: 1166 case CK_FloatingComplexToBoolean: 1167 case CK_IntegralComplexToBoolean: 1168 case CK_LValueBitCast: // -> bool& 1169 case CK_UserDefinedConversion: // operator bool() 1170 CheckNoBasePath: 1171 assert(path_empty() && "Cast kind should not have a base path!"); 1172 break; 1173 } 1174} 1175 1176const char *CastExpr::getCastKindName() const { 1177 switch (getCastKind()) { 1178 case CK_Dependent: 1179 return "Dependent"; 1180 case CK_BitCast: 1181 return "BitCast"; 1182 case CK_LValueBitCast: 1183 return "LValueBitCast"; 1184 case CK_LValueToRValue: 1185 return "LValueToRValue"; 1186 case CK_NoOp: 1187 return "NoOp"; 1188 case CK_BaseToDerived: 1189 return "BaseToDerived"; 1190 case CK_DerivedToBase: 1191 return "DerivedToBase"; 1192 case CK_UncheckedDerivedToBase: 1193 return "UncheckedDerivedToBase"; 1194 case CK_Dynamic: 1195 return "Dynamic"; 1196 case CK_ToUnion: 1197 return "ToUnion"; 1198 case CK_ArrayToPointerDecay: 1199 return "ArrayToPointerDecay"; 1200 case CK_FunctionToPointerDecay: 1201 return "FunctionToPointerDecay"; 1202 case CK_NullToMemberPointer: 1203 return "NullToMemberPointer"; 1204 case CK_NullToPointer: 1205 return "NullToPointer"; 1206 case CK_BaseToDerivedMemberPointer: 1207 return "BaseToDerivedMemberPointer"; 1208 case CK_DerivedToBaseMemberPointer: 1209 return "DerivedToBaseMemberPointer"; 1210 case CK_ReinterpretMemberPointer: 1211 return "ReinterpretMemberPointer"; 1212 case CK_UserDefinedConversion: 1213 return "UserDefinedConversion"; 1214 case CK_ConstructorConversion: 1215 return "ConstructorConversion"; 1216 case CK_IntegralToPointer: 1217 return "IntegralToPointer"; 1218 case CK_PointerToIntegral: 1219 return "PointerToIntegral"; 1220 case CK_PointerToBoolean: 1221 return "PointerToBoolean"; 1222 case CK_ToVoid: 1223 return "ToVoid"; 1224 case CK_VectorSplat: 1225 return "VectorSplat"; 1226 case CK_IntegralCast: 1227 return "IntegralCast"; 1228 case CK_IntegralToBoolean: 1229 return "IntegralToBoolean"; 1230 case CK_IntegralToFloating: 1231 return "IntegralToFloating"; 1232 case CK_FloatingToIntegral: 1233 return "FloatingToIntegral"; 1234 case CK_FloatingCast: 1235 return "FloatingCast"; 1236 case CK_FloatingToBoolean: 1237 return "FloatingToBoolean"; 1238 case CK_MemberPointerToBoolean: 1239 return "MemberPointerToBoolean"; 1240 case CK_CPointerToObjCPointerCast: 1241 return "CPointerToObjCPointerCast"; 1242 case CK_BlockPointerToObjCPointerCast: 1243 return "BlockPointerToObjCPointerCast"; 1244 case CK_AnyPointerToBlockPointerCast: 1245 return "AnyPointerToBlockPointerCast"; 1246 case CK_ObjCObjectLValueCast: 1247 return "ObjCObjectLValueCast"; 1248 case CK_FloatingRealToComplex: 1249 return "FloatingRealToComplex"; 1250 case CK_FloatingComplexToReal: 1251 return "FloatingComplexToReal"; 1252 case CK_FloatingComplexToBoolean: 1253 return "FloatingComplexToBoolean"; 1254 case CK_FloatingComplexCast: 1255 return "FloatingComplexCast"; 1256 case CK_FloatingComplexToIntegralComplex: 1257 return "FloatingComplexToIntegralComplex"; 1258 case CK_IntegralRealToComplex: 1259 return "IntegralRealToComplex"; 1260 case CK_IntegralComplexToReal: 1261 return "IntegralComplexToReal"; 1262 case CK_IntegralComplexToBoolean: 1263 return "IntegralComplexToBoolean"; 1264 case CK_IntegralComplexCast: 1265 return "IntegralComplexCast"; 1266 case CK_IntegralComplexToFloatingComplex: 1267 return "IntegralComplexToFloatingComplex"; 1268 case CK_ARCConsumeObject: 1269 return "ARCConsumeObject"; 1270 case CK_ARCProduceObject: 1271 return "ARCProduceObject"; 1272 case CK_ARCReclaimReturnedObject: 1273 return "ARCReclaimReturnedObject"; 1274 case CK_ARCExtendBlockObject: 1275 return "ARCCExtendBlockObject"; 1276 case CK_AtomicToNonAtomic: 1277 return "AtomicToNonAtomic"; 1278 case CK_NonAtomicToAtomic: 1279 return "NonAtomicToAtomic"; 1280 case CK_CopyAndAutoreleaseBlockObject: 1281 return "CopyAndAutoreleaseBlockObject"; 1282 } 1283 1284 llvm_unreachable("Unhandled cast kind!"); 1285} 1286 1287Expr *CastExpr::getSubExprAsWritten() { 1288 Expr *SubExpr = 0; 1289 CastExpr *E = this; 1290 do { 1291 SubExpr = E->getSubExpr(); 1292 1293 // Skip through reference binding to temporary. 1294 if (MaterializeTemporaryExpr *Materialize 1295 = dyn_cast<MaterializeTemporaryExpr>(SubExpr)) 1296 SubExpr = Materialize->GetTemporaryExpr(); 1297 1298 // Skip any temporary bindings; they're implicit. 1299 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1300 SubExpr = Binder->getSubExpr(); 1301 1302 // Conversions by constructor and conversion functions have a 1303 // subexpression describing the call; strip it off. 1304 if (E->getCastKind() == CK_ConstructorConversion) 1305 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1306 else if (E->getCastKind() == CK_UserDefinedConversion) 1307 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1308 1309 // If the subexpression we're left with is an implicit cast, look 1310 // through that, too. 1311 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1312 1313 return SubExpr; 1314} 1315 1316CXXBaseSpecifier **CastExpr::path_buffer() { 1317 switch (getStmtClass()) { 1318#define ABSTRACT_STMT(x) 1319#define CASTEXPR(Type, Base) \ 1320 case Stmt::Type##Class: \ 1321 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1322#define STMT(Type, Base) 1323#include "clang/AST/StmtNodes.inc" 1324 default: 1325 llvm_unreachable("non-cast expressions not possible here"); 1326 } 1327} 1328 1329void CastExpr::setCastPath(const CXXCastPath &Path) { 1330 assert(Path.size() == path_size()); 1331 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1332} 1333 1334ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1335 CastKind Kind, Expr *Operand, 1336 const CXXCastPath *BasePath, 1337 ExprValueKind VK) { 1338 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1339 void *Buffer = 1340 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1341 ImplicitCastExpr *E = 1342 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1343 if (PathSize) E->setCastPath(*BasePath); 1344 return E; 1345} 1346 1347ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1348 unsigned PathSize) { 1349 void *Buffer = 1350 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1351 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1352} 1353 1354 1355CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1356 ExprValueKind VK, CastKind K, Expr *Op, 1357 const CXXCastPath *BasePath, 1358 TypeSourceInfo *WrittenTy, 1359 SourceLocation L, SourceLocation R) { 1360 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1361 void *Buffer = 1362 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1363 CStyleCastExpr *E = 1364 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1365 if (PathSize) E->setCastPath(*BasePath); 1366 return E; 1367} 1368 1369CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1370 void *Buffer = 1371 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1372 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1373} 1374 1375/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1376/// corresponds to, e.g. "<<=". 1377const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1378 switch (Op) { 1379 case BO_PtrMemD: return ".*"; 1380 case BO_PtrMemI: return "->*"; 1381 case BO_Mul: return "*"; 1382 case BO_Div: return "/"; 1383 case BO_Rem: return "%"; 1384 case BO_Add: return "+"; 1385 case BO_Sub: return "-"; 1386 case BO_Shl: return "<<"; 1387 case BO_Shr: return ">>"; 1388 case BO_LT: return "<"; 1389 case BO_GT: return ">"; 1390 case BO_LE: return "<="; 1391 case BO_GE: return ">="; 1392 case BO_EQ: return "=="; 1393 case BO_NE: return "!="; 1394 case BO_And: return "&"; 1395 case BO_Xor: return "^"; 1396 case BO_Or: return "|"; 1397 case BO_LAnd: return "&&"; 1398 case BO_LOr: return "||"; 1399 case BO_Assign: return "="; 1400 case BO_MulAssign: return "*="; 1401 case BO_DivAssign: return "/="; 1402 case BO_RemAssign: return "%="; 1403 case BO_AddAssign: return "+="; 1404 case BO_SubAssign: return "-="; 1405 case BO_ShlAssign: return "<<="; 1406 case BO_ShrAssign: return ">>="; 1407 case BO_AndAssign: return "&="; 1408 case BO_XorAssign: return "^="; 1409 case BO_OrAssign: return "|="; 1410 case BO_Comma: return ","; 1411 } 1412 1413 llvm_unreachable("Invalid OpCode!"); 1414} 1415 1416BinaryOperatorKind 1417BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1418 switch (OO) { 1419 default: llvm_unreachable("Not an overloadable binary operator"); 1420 case OO_Plus: return BO_Add; 1421 case OO_Minus: return BO_Sub; 1422 case OO_Star: return BO_Mul; 1423 case OO_Slash: return BO_Div; 1424 case OO_Percent: return BO_Rem; 1425 case OO_Caret: return BO_Xor; 1426 case OO_Amp: return BO_And; 1427 case OO_Pipe: return BO_Or; 1428 case OO_Equal: return BO_Assign; 1429 case OO_Less: return BO_LT; 1430 case OO_Greater: return BO_GT; 1431 case OO_PlusEqual: return BO_AddAssign; 1432 case OO_MinusEqual: return BO_SubAssign; 1433 case OO_StarEqual: return BO_MulAssign; 1434 case OO_SlashEqual: return BO_DivAssign; 1435 case OO_PercentEqual: return BO_RemAssign; 1436 case OO_CaretEqual: return BO_XorAssign; 1437 case OO_AmpEqual: return BO_AndAssign; 1438 case OO_PipeEqual: return BO_OrAssign; 1439 case OO_LessLess: return BO_Shl; 1440 case OO_GreaterGreater: return BO_Shr; 1441 case OO_LessLessEqual: return BO_ShlAssign; 1442 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1443 case OO_EqualEqual: return BO_EQ; 1444 case OO_ExclaimEqual: return BO_NE; 1445 case OO_LessEqual: return BO_LE; 1446 case OO_GreaterEqual: return BO_GE; 1447 case OO_AmpAmp: return BO_LAnd; 1448 case OO_PipePipe: return BO_LOr; 1449 case OO_Comma: return BO_Comma; 1450 case OO_ArrowStar: return BO_PtrMemI; 1451 } 1452} 1453 1454OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1455 static const OverloadedOperatorKind OverOps[] = { 1456 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1457 OO_Star, OO_Slash, OO_Percent, 1458 OO_Plus, OO_Minus, 1459 OO_LessLess, OO_GreaterGreater, 1460 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1461 OO_EqualEqual, OO_ExclaimEqual, 1462 OO_Amp, 1463 OO_Caret, 1464 OO_Pipe, 1465 OO_AmpAmp, 1466 OO_PipePipe, 1467 OO_Equal, OO_StarEqual, 1468 OO_SlashEqual, OO_PercentEqual, 1469 OO_PlusEqual, OO_MinusEqual, 1470 OO_LessLessEqual, OO_GreaterGreaterEqual, 1471 OO_AmpEqual, OO_CaretEqual, 1472 OO_PipeEqual, 1473 OO_Comma 1474 }; 1475 return OverOps[Opc]; 1476} 1477 1478InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1479 Expr **initExprs, unsigned numInits, 1480 SourceLocation rbraceloc) 1481 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1482 false, false), 1483 InitExprs(C, numInits), 1484 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0) 1485{ 1486 sawArrayRangeDesignator(false); 1487 setInitializesStdInitializerList(false); 1488 for (unsigned I = 0; I != numInits; ++I) { 1489 if (initExprs[I]->isTypeDependent()) 1490 ExprBits.TypeDependent = true; 1491 if (initExprs[I]->isValueDependent()) 1492 ExprBits.ValueDependent = true; 1493 if (initExprs[I]->isInstantiationDependent()) 1494 ExprBits.InstantiationDependent = true; 1495 if (initExprs[I]->containsUnexpandedParameterPack()) 1496 ExprBits.ContainsUnexpandedParameterPack = true; 1497 } 1498 1499 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1500} 1501 1502void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1503 if (NumInits > InitExprs.size()) 1504 InitExprs.reserve(C, NumInits); 1505} 1506 1507void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1508 InitExprs.resize(C, NumInits, 0); 1509} 1510 1511Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1512 if (Init >= InitExprs.size()) { 1513 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1514 InitExprs.back() = expr; 1515 return 0; 1516 } 1517 1518 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1519 InitExprs[Init] = expr; 1520 return Result; 1521} 1522 1523void InitListExpr::setArrayFiller(Expr *filler) { 1524 assert(!hasArrayFiller() && "Filler already set!"); 1525 ArrayFillerOrUnionFieldInit = filler; 1526 // Fill out any "holes" in the array due to designated initializers. 1527 Expr **inits = getInits(); 1528 for (unsigned i = 0, e = getNumInits(); i != e; ++i) 1529 if (inits[i] == 0) 1530 inits[i] = filler; 1531} 1532 1533SourceRange InitListExpr::getSourceRange() const { 1534 if (SyntacticForm) 1535 return SyntacticForm->getSourceRange(); 1536 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1537 if (Beg.isInvalid()) { 1538 // Find the first non-null initializer. 1539 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1540 E = InitExprs.end(); 1541 I != E; ++I) { 1542 if (Stmt *S = *I) { 1543 Beg = S->getLocStart(); 1544 break; 1545 } 1546 } 1547 } 1548 if (End.isInvalid()) { 1549 // Find the first non-null initializer from the end. 1550 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1551 E = InitExprs.rend(); 1552 I != E; ++I) { 1553 if (Stmt *S = *I) { 1554 End = S->getSourceRange().getEnd(); 1555 break; 1556 } 1557 } 1558 } 1559 return SourceRange(Beg, End); 1560} 1561 1562/// getFunctionType - Return the underlying function type for this block. 1563/// 1564const FunctionProtoType *BlockExpr::getFunctionType() const { 1565 // The block pointer is never sugared, but the function type might be. 1566 return cast<BlockPointerType>(getType()) 1567 ->getPointeeType()->castAs<FunctionProtoType>(); 1568} 1569 1570SourceLocation BlockExpr::getCaretLocation() const { 1571 return TheBlock->getCaretLocation(); 1572} 1573const Stmt *BlockExpr::getBody() const { 1574 return TheBlock->getBody(); 1575} 1576Stmt *BlockExpr::getBody() { 1577 return TheBlock->getBody(); 1578} 1579 1580 1581//===----------------------------------------------------------------------===// 1582// Generic Expression Routines 1583//===----------------------------------------------------------------------===// 1584 1585/// isUnusedResultAWarning - Return true if this immediate expression should 1586/// be warned about if the result is unused. If so, fill in Loc and Ranges 1587/// with location to warn on and the source range[s] to report with the 1588/// warning. 1589bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1590 SourceRange &R2, ASTContext &Ctx) const { 1591 // Don't warn if the expr is type dependent. The type could end up 1592 // instantiating to void. 1593 if (isTypeDependent()) 1594 return false; 1595 1596 switch (getStmtClass()) { 1597 default: 1598 if (getType()->isVoidType()) 1599 return false; 1600 Loc = getExprLoc(); 1601 R1 = getSourceRange(); 1602 return true; 1603 case ParenExprClass: 1604 return cast<ParenExpr>(this)->getSubExpr()-> 1605 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1606 case GenericSelectionExprClass: 1607 return cast<GenericSelectionExpr>(this)->getResultExpr()-> 1608 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1609 case UnaryOperatorClass: { 1610 const UnaryOperator *UO = cast<UnaryOperator>(this); 1611 1612 switch (UO->getOpcode()) { 1613 default: break; 1614 case UO_PostInc: 1615 case UO_PostDec: 1616 case UO_PreInc: 1617 case UO_PreDec: // ++/-- 1618 return false; // Not a warning. 1619 case UO_Deref: 1620 // Dereferencing a volatile pointer is a side-effect. 1621 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1622 return false; 1623 break; 1624 case UO_Real: 1625 case UO_Imag: 1626 // accessing a piece of a volatile complex is a side-effect. 1627 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1628 .isVolatileQualified()) 1629 return false; 1630 break; 1631 case UO_Extension: 1632 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1633 } 1634 Loc = UO->getOperatorLoc(); 1635 R1 = UO->getSubExpr()->getSourceRange(); 1636 return true; 1637 } 1638 case BinaryOperatorClass: { 1639 const BinaryOperator *BO = cast<BinaryOperator>(this); 1640 switch (BO->getOpcode()) { 1641 default: 1642 break; 1643 // Consider the RHS of comma for side effects. LHS was checked by 1644 // Sema::CheckCommaOperands. 1645 case BO_Comma: 1646 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1647 // lvalue-ness) of an assignment written in a macro. 1648 if (IntegerLiteral *IE = 1649 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1650 if (IE->getValue() == 0) 1651 return false; 1652 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1653 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1654 case BO_LAnd: 1655 case BO_LOr: 1656 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1657 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1658 return false; 1659 break; 1660 } 1661 if (BO->isAssignmentOp()) 1662 return false; 1663 Loc = BO->getOperatorLoc(); 1664 R1 = BO->getLHS()->getSourceRange(); 1665 R2 = BO->getRHS()->getSourceRange(); 1666 return true; 1667 } 1668 case CompoundAssignOperatorClass: 1669 case VAArgExprClass: 1670 case AtomicExprClass: 1671 return false; 1672 1673 case ConditionalOperatorClass: { 1674 // If only one of the LHS or RHS is a warning, the operator might 1675 // be being used for control flow. Only warn if both the LHS and 1676 // RHS are warnings. 1677 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1678 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1679 return false; 1680 if (!Exp->getLHS()) 1681 return true; 1682 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1683 } 1684 1685 case MemberExprClass: 1686 // If the base pointer or element is to a volatile pointer/field, accessing 1687 // it is a side effect. 1688 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1689 return false; 1690 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1691 R1 = SourceRange(Loc, Loc); 1692 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1693 return true; 1694 1695 case ArraySubscriptExprClass: 1696 // If the base pointer or element is to a volatile pointer/field, accessing 1697 // it is a side effect. 1698 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1699 return false; 1700 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1701 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1702 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1703 return true; 1704 1705 case CXXOperatorCallExprClass: { 1706 // We warn about operator== and operator!= even when user-defined operator 1707 // overloads as there is no reasonable way to define these such that they 1708 // have non-trivial, desirable side-effects. See the -Wunused-comparison 1709 // warning: these operators are commonly typo'ed, and so warning on them 1710 // provides additional value as well. If this list is updated, 1711 // DiagnoseUnusedComparison should be as well. 1712 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this); 1713 if (Op->getOperator() == OO_EqualEqual || 1714 Op->getOperator() == OO_ExclaimEqual) { 1715 Loc = Op->getOperatorLoc(); 1716 R1 = Op->getSourceRange(); 1717 return true; 1718 } 1719 1720 // Fallthrough for generic call handling. 1721 } 1722 case CallExprClass: 1723 case CXXMemberCallExprClass: 1724 case UserDefinedLiteralClass: { 1725 // If this is a direct call, get the callee. 1726 const CallExpr *CE = cast<CallExpr>(this); 1727 if (const Decl *FD = CE->getCalleeDecl()) { 1728 // If the callee has attribute pure, const, or warn_unused_result, warn 1729 // about it. void foo() { strlen("bar"); } should warn. 1730 // 1731 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1732 // updated to match for QoI. 1733 if (FD->getAttr<WarnUnusedResultAttr>() || 1734 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1735 Loc = CE->getCallee()->getLocStart(); 1736 R1 = CE->getCallee()->getSourceRange(); 1737 1738 if (unsigned NumArgs = CE->getNumArgs()) 1739 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1740 CE->getArg(NumArgs-1)->getLocEnd()); 1741 return true; 1742 } 1743 } 1744 return false; 1745 } 1746 1747 case CXXTemporaryObjectExprClass: 1748 case CXXConstructExprClass: 1749 return false; 1750 1751 case ObjCMessageExprClass: { 1752 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1753 if (Ctx.getLangOpts().ObjCAutoRefCount && 1754 ME->isInstanceMessage() && 1755 !ME->getType()->isVoidType() && 1756 ME->getSelector().getIdentifierInfoForSlot(0) && 1757 ME->getSelector().getIdentifierInfoForSlot(0) 1758 ->getName().startswith("init")) { 1759 Loc = getExprLoc(); 1760 R1 = ME->getSourceRange(); 1761 return true; 1762 } 1763 1764 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1765 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1766 Loc = getExprLoc(); 1767 return true; 1768 } 1769 return false; 1770 } 1771 1772 case ObjCPropertyRefExprClass: 1773 Loc = getExprLoc(); 1774 R1 = getSourceRange(); 1775 return true; 1776 1777 case PseudoObjectExprClass: { 1778 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this); 1779 1780 // Only complain about things that have the form of a getter. 1781 if (isa<UnaryOperator>(PO->getSyntacticForm()) || 1782 isa<BinaryOperator>(PO->getSyntacticForm())) 1783 return false; 1784 1785 Loc = getExprLoc(); 1786 R1 = getSourceRange(); 1787 return true; 1788 } 1789 1790 case StmtExprClass: { 1791 // Statement exprs don't logically have side effects themselves, but are 1792 // sometimes used in macros in ways that give them a type that is unused. 1793 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1794 // however, if the result of the stmt expr is dead, we don't want to emit a 1795 // warning. 1796 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1797 if (!CS->body_empty()) { 1798 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1799 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1800 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1801 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1802 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1803 } 1804 1805 if (getType()->isVoidType()) 1806 return false; 1807 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1808 R1 = getSourceRange(); 1809 return true; 1810 } 1811 case CStyleCastExprClass: 1812 // If this is an explicit cast to void, allow it. People do this when they 1813 // think they know what they're doing :). 1814 if (getType()->isVoidType()) 1815 return false; 1816 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1817 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1818 return true; 1819 case CXXFunctionalCastExprClass: { 1820 if (getType()->isVoidType()) 1821 return false; 1822 const CastExpr *CE = cast<CastExpr>(this); 1823 1824 // If this is a cast to void or a constructor conversion, check the operand. 1825 // Otherwise, the result of the cast is unused. 1826 if (CE->getCastKind() == CK_ToVoid || 1827 CE->getCastKind() == CK_ConstructorConversion) 1828 return (cast<CastExpr>(this)->getSubExpr() 1829 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1830 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1831 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1832 return true; 1833 } 1834 1835 case ImplicitCastExprClass: 1836 // Check the operand, since implicit casts are inserted by Sema 1837 return (cast<ImplicitCastExpr>(this) 1838 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1839 1840 case CXXDefaultArgExprClass: 1841 return (cast<CXXDefaultArgExpr>(this) 1842 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1843 1844 case CXXNewExprClass: 1845 // FIXME: In theory, there might be new expressions that don't have side 1846 // effects (e.g. a placement new with an uninitialized POD). 1847 case CXXDeleteExprClass: 1848 return false; 1849 case CXXBindTemporaryExprClass: 1850 return (cast<CXXBindTemporaryExpr>(this) 1851 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1852 case ExprWithCleanupsClass: 1853 return (cast<ExprWithCleanups>(this) 1854 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1855 } 1856} 1857 1858/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1859/// returns true, if it is; false otherwise. 1860bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1861 const Expr *E = IgnoreParens(); 1862 switch (E->getStmtClass()) { 1863 default: 1864 return false; 1865 case ObjCIvarRefExprClass: 1866 return true; 1867 case Expr::UnaryOperatorClass: 1868 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1869 case ImplicitCastExprClass: 1870 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1871 case MaterializeTemporaryExprClass: 1872 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr() 1873 ->isOBJCGCCandidate(Ctx); 1874 case CStyleCastExprClass: 1875 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1876 case DeclRefExprClass: { 1877 const Decl *D = cast<DeclRefExpr>(E)->getDecl(); 1878 1879 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1880 if (VD->hasGlobalStorage()) 1881 return true; 1882 QualType T = VD->getType(); 1883 // dereferencing to a pointer is always a gc'able candidate, 1884 // unless it is __weak. 1885 return T->isPointerType() && 1886 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1887 } 1888 return false; 1889 } 1890 case MemberExprClass: { 1891 const MemberExpr *M = cast<MemberExpr>(E); 1892 return M->getBase()->isOBJCGCCandidate(Ctx); 1893 } 1894 case ArraySubscriptExprClass: 1895 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx); 1896 } 1897} 1898 1899bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1900 if (isTypeDependent()) 1901 return false; 1902 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1903} 1904 1905QualType Expr::findBoundMemberType(const Expr *expr) { 1906 assert(expr->hasPlaceholderType(BuiltinType::BoundMember)); 1907 1908 // Bound member expressions are always one of these possibilities: 1909 // x->m x.m x->*y x.*y 1910 // (possibly parenthesized) 1911 1912 expr = expr->IgnoreParens(); 1913 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) { 1914 assert(isa<CXXMethodDecl>(mem->getMemberDecl())); 1915 return mem->getMemberDecl()->getType(); 1916 } 1917 1918 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) { 1919 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>() 1920 ->getPointeeType(); 1921 assert(type->isFunctionType()); 1922 return type; 1923 } 1924 1925 assert(isa<UnresolvedMemberExpr>(expr)); 1926 return QualType(); 1927} 1928 1929static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1930 Expr::CanThrowResult CT2) { 1931 // CanThrowResult constants are ordered so that the maximum is the correct 1932 // merge result. 1933 return CT1 > CT2 ? CT1 : CT2; 1934} 1935 1936static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1937 Expr *E = const_cast<Expr*>(CE); 1938 Expr::CanThrowResult R = Expr::CT_Cannot; 1939 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 1940 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1941 } 1942 return R; 1943} 1944 1945static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Expr *E, 1946 const Decl *D, 1947 bool NullThrows = true) { 1948 if (!D) 1949 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1950 1951 // See if we can get a function type from the decl somehow. 1952 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1953 if (!VD) // If we have no clue what we're calling, assume the worst. 1954 return Expr::CT_Can; 1955 1956 // As an extension, we assume that __attribute__((nothrow)) functions don't 1957 // throw. 1958 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1959 return Expr::CT_Cannot; 1960 1961 QualType T = VD->getType(); 1962 const FunctionProtoType *FT; 1963 if ((FT = T->getAs<FunctionProtoType>())) { 1964 } else if (const PointerType *PT = T->getAs<PointerType>()) 1965 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1966 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1967 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1968 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1969 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1970 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1971 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1972 1973 if (!FT) 1974 return Expr::CT_Can; 1975 1976 if (FT->getExceptionSpecType() == EST_Delayed) { 1977 assert(isa<CXXConstructorDecl>(D) && 1978 "only constructor exception specs can be unknown"); 1979 Ctx.getDiagnostics().Report(E->getLocStart(), 1980 diag::err_exception_spec_unknown) 1981 << E->getSourceRange(); 1982 return Expr::CT_Can; 1983 } 1984 1985 return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can; 1986} 1987 1988static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1989 if (DC->isTypeDependent()) 1990 return Expr::CT_Dependent; 1991 1992 if (!DC->getTypeAsWritten()->isReferenceType()) 1993 return Expr::CT_Cannot; 1994 1995 if (DC->getSubExpr()->isTypeDependent()) 1996 return Expr::CT_Dependent; 1997 1998 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1999} 2000 2001static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 2002 const CXXTypeidExpr *DC) { 2003 if (DC->isTypeOperand()) 2004 return Expr::CT_Cannot; 2005 2006 Expr *Op = DC->getExprOperand(); 2007 if (Op->isTypeDependent()) 2008 return Expr::CT_Dependent; 2009 2010 const RecordType *RT = Op->getType()->getAs<RecordType>(); 2011 if (!RT) 2012 return Expr::CT_Cannot; 2013 2014 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 2015 return Expr::CT_Cannot; 2016 2017 if (Op->Classify(C).isPRValue()) 2018 return Expr::CT_Cannot; 2019 2020 return Expr::CT_Can; 2021} 2022 2023Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 2024 // C++ [expr.unary.noexcept]p3: 2025 // [Can throw] if in a potentially-evaluated context the expression would 2026 // contain: 2027 switch (getStmtClass()) { 2028 case CXXThrowExprClass: 2029 // - a potentially evaluated throw-expression 2030 return CT_Can; 2031 2032 case CXXDynamicCastExprClass: { 2033 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 2034 // where T is a reference type, that requires a run-time check 2035 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 2036 if (CT == CT_Can) 2037 return CT; 2038 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2039 } 2040 2041 case CXXTypeidExprClass: 2042 // - a potentially evaluated typeid expression applied to a glvalue 2043 // expression whose type is a polymorphic class type 2044 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 2045 2046 // - a potentially evaluated call to a function, member function, function 2047 // pointer, or member function pointer that does not have a non-throwing 2048 // exception-specification 2049 case CallExprClass: 2050 case CXXMemberCallExprClass: 2051 case CXXOperatorCallExprClass: 2052 case UserDefinedLiteralClass: { 2053 const CallExpr *CE = cast<CallExpr>(this); 2054 CanThrowResult CT; 2055 if (isTypeDependent()) 2056 CT = CT_Dependent; 2057 else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) 2058 CT = CT_Cannot; 2059 else 2060 CT = CanCalleeThrow(C, this, CE->getCalleeDecl()); 2061 if (CT == CT_Can) 2062 return CT; 2063 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2064 } 2065 2066 case CXXConstructExprClass: 2067 case CXXTemporaryObjectExprClass: { 2068 CanThrowResult CT = CanCalleeThrow(C, this, 2069 cast<CXXConstructExpr>(this)->getConstructor()); 2070 if (CT == CT_Can) 2071 return CT; 2072 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2073 } 2074 2075 case LambdaExprClass: { 2076 const LambdaExpr *Lambda = cast<LambdaExpr>(this); 2077 CanThrowResult CT = Expr::CT_Cannot; 2078 for (LambdaExpr::capture_init_iterator Cap = Lambda->capture_init_begin(), 2079 CapEnd = Lambda->capture_init_end(); 2080 Cap != CapEnd; ++Cap) 2081 CT = MergeCanThrow(CT, (*Cap)->CanThrow(C)); 2082 return CT; 2083 } 2084 2085 case CXXNewExprClass: { 2086 CanThrowResult CT; 2087 if (isTypeDependent()) 2088 CT = CT_Dependent; 2089 else 2090 CT = CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getOperatorNew()); 2091 if (CT == CT_Can) 2092 return CT; 2093 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2094 } 2095 2096 case CXXDeleteExprClass: { 2097 CanThrowResult CT; 2098 QualType DTy = cast<CXXDeleteExpr>(this)->getDestroyedType(); 2099 if (DTy.isNull() || DTy->isDependentType()) { 2100 CT = CT_Dependent; 2101 } else { 2102 CT = CanCalleeThrow(C, this, 2103 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 2104 if (const RecordType *RT = DTy->getAs<RecordType>()) { 2105 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2106 CT = MergeCanThrow(CT, CanCalleeThrow(C, this, RD->getDestructor())); 2107 } 2108 if (CT == CT_Can) 2109 return CT; 2110 } 2111 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2112 } 2113 2114 case CXXBindTemporaryExprClass: { 2115 // The bound temporary has to be destroyed again, which might throw. 2116 CanThrowResult CT = CanCalleeThrow(C, this, 2117 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 2118 if (CT == CT_Can) 2119 return CT; 2120 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2121 } 2122 2123 // ObjC message sends are like function calls, but never have exception 2124 // specs. 2125 case ObjCMessageExprClass: 2126 case ObjCPropertyRefExprClass: 2127 case ObjCSubscriptRefExprClass: 2128 return CT_Can; 2129 2130 // All the ObjC literals that are implemented as calls are 2131 // potentially throwing unless we decide to close off that 2132 // possibility. 2133 case ObjCArrayLiteralClass: 2134 case ObjCBoolLiteralExprClass: 2135 case ObjCDictionaryLiteralClass: 2136 case ObjCNumericLiteralClass: 2137 return CT_Can; 2138 2139 // Many other things have subexpressions, so we have to test those. 2140 // Some are simple: 2141 case ConditionalOperatorClass: 2142 case CompoundLiteralExprClass: 2143 case CXXConstCastExprClass: 2144 case CXXDefaultArgExprClass: 2145 case CXXReinterpretCastExprClass: 2146 case DesignatedInitExprClass: 2147 case ExprWithCleanupsClass: 2148 case ExtVectorElementExprClass: 2149 case InitListExprClass: 2150 case MemberExprClass: 2151 case ObjCIsaExprClass: 2152 case ObjCIvarRefExprClass: 2153 case ParenExprClass: 2154 case ParenListExprClass: 2155 case ShuffleVectorExprClass: 2156 case VAArgExprClass: 2157 return CanSubExprsThrow(C, this); 2158 2159 // Some might be dependent for other reasons. 2160 case ArraySubscriptExprClass: 2161 case BinaryOperatorClass: 2162 case CompoundAssignOperatorClass: 2163 case CStyleCastExprClass: 2164 case CXXStaticCastExprClass: 2165 case CXXFunctionalCastExprClass: 2166 case ImplicitCastExprClass: 2167 case MaterializeTemporaryExprClass: 2168 case UnaryOperatorClass: { 2169 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 2170 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2171 } 2172 2173 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 2174 case StmtExprClass: 2175 return CT_Can; 2176 2177 case ChooseExprClass: 2178 if (isTypeDependent() || isValueDependent()) 2179 return CT_Dependent; 2180 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 2181 2182 case GenericSelectionExprClass: 2183 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2184 return CT_Dependent; 2185 return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C); 2186 2187 // Some expressions are always dependent. 2188 case CXXDependentScopeMemberExprClass: 2189 case CXXUnresolvedConstructExprClass: 2190 case DependentScopeDeclRefExprClass: 2191 return CT_Dependent; 2192 2193 case AtomicExprClass: 2194 case AsTypeExprClass: 2195 case BinaryConditionalOperatorClass: 2196 case BlockExprClass: 2197 case CUDAKernelCallExprClass: 2198 case DeclRefExprClass: 2199 case ObjCBridgedCastExprClass: 2200 case ObjCIndirectCopyRestoreExprClass: 2201 case ObjCProtocolExprClass: 2202 case ObjCSelectorExprClass: 2203 case OffsetOfExprClass: 2204 case PackExpansionExprClass: 2205 case PseudoObjectExprClass: 2206 case SubstNonTypeTemplateParmExprClass: 2207 case SubstNonTypeTemplateParmPackExprClass: 2208 case UnaryExprOrTypeTraitExprClass: 2209 case UnresolvedLookupExprClass: 2210 case UnresolvedMemberExprClass: 2211 // FIXME: Can any of the above throw? If so, when? 2212 return CT_Cannot; 2213 2214 case AddrLabelExprClass: 2215 case ArrayTypeTraitExprClass: 2216 case BinaryTypeTraitExprClass: 2217 case TypeTraitExprClass: 2218 case CXXBoolLiteralExprClass: 2219 case CXXNoexceptExprClass: 2220 case CXXNullPtrLiteralExprClass: 2221 case CXXPseudoDestructorExprClass: 2222 case CXXScalarValueInitExprClass: 2223 case CXXThisExprClass: 2224 case CXXUuidofExprClass: 2225 case CharacterLiteralClass: 2226 case ExpressionTraitExprClass: 2227 case FloatingLiteralClass: 2228 case GNUNullExprClass: 2229 case ImaginaryLiteralClass: 2230 case ImplicitValueInitExprClass: 2231 case IntegerLiteralClass: 2232 case ObjCEncodeExprClass: 2233 case ObjCStringLiteralClass: 2234 case OpaqueValueExprClass: 2235 case PredefinedExprClass: 2236 case SizeOfPackExprClass: 2237 case StringLiteralClass: 2238 case UnaryTypeTraitExprClass: 2239 // These expressions can never throw. 2240 return CT_Cannot; 2241 2242#define STMT(CLASS, PARENT) case CLASS##Class: 2243#define STMT_RANGE(Base, First, Last) 2244#define LAST_STMT_RANGE(BASE, FIRST, LAST) 2245#define EXPR(CLASS, PARENT) 2246#define ABSTRACT_STMT(STMT) 2247#include "clang/AST/StmtNodes.inc" 2248 case NoStmtClass: 2249 llvm_unreachable("Invalid class for expression"); 2250 } 2251 llvm_unreachable("Bogus StmtClass"); 2252} 2253 2254Expr* Expr::IgnoreParens() { 2255 Expr* E = this; 2256 while (true) { 2257 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2258 E = P->getSubExpr(); 2259 continue; 2260 } 2261 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2262 if (P->getOpcode() == UO_Extension) { 2263 E = P->getSubExpr(); 2264 continue; 2265 } 2266 } 2267 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2268 if (!P->isResultDependent()) { 2269 E = P->getResultExpr(); 2270 continue; 2271 } 2272 } 2273 return E; 2274 } 2275} 2276 2277/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 2278/// or CastExprs or ImplicitCastExprs, returning their operand. 2279Expr *Expr::IgnoreParenCasts() { 2280 Expr *E = this; 2281 while (true) { 2282 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2283 E = P->getSubExpr(); 2284 continue; 2285 } 2286 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2287 E = P->getSubExpr(); 2288 continue; 2289 } 2290 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2291 if (P->getOpcode() == UO_Extension) { 2292 E = P->getSubExpr(); 2293 continue; 2294 } 2295 } 2296 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2297 if (!P->isResultDependent()) { 2298 E = P->getResultExpr(); 2299 continue; 2300 } 2301 } 2302 if (MaterializeTemporaryExpr *Materialize 2303 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2304 E = Materialize->GetTemporaryExpr(); 2305 continue; 2306 } 2307 if (SubstNonTypeTemplateParmExpr *NTTP 2308 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2309 E = NTTP->getReplacement(); 2310 continue; 2311 } 2312 return E; 2313 } 2314} 2315 2316/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 2317/// casts. This is intended purely as a temporary workaround for code 2318/// that hasn't yet been rewritten to do the right thing about those 2319/// casts, and may disappear along with the last internal use. 2320Expr *Expr::IgnoreParenLValueCasts() { 2321 Expr *E = this; 2322 while (true) { 2323 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2324 E = P->getSubExpr(); 2325 continue; 2326 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2327 if (P->getCastKind() == CK_LValueToRValue) { 2328 E = P->getSubExpr(); 2329 continue; 2330 } 2331 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2332 if (P->getOpcode() == UO_Extension) { 2333 E = P->getSubExpr(); 2334 continue; 2335 } 2336 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2337 if (!P->isResultDependent()) { 2338 E = P->getResultExpr(); 2339 continue; 2340 } 2341 } else if (MaterializeTemporaryExpr *Materialize 2342 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2343 E = Materialize->GetTemporaryExpr(); 2344 continue; 2345 } else if (SubstNonTypeTemplateParmExpr *NTTP 2346 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2347 E = NTTP->getReplacement(); 2348 continue; 2349 } 2350 break; 2351 } 2352 return E; 2353} 2354 2355Expr *Expr::IgnoreParenImpCasts() { 2356 Expr *E = this; 2357 while (true) { 2358 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2359 E = P->getSubExpr(); 2360 continue; 2361 } 2362 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 2363 E = P->getSubExpr(); 2364 continue; 2365 } 2366 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2367 if (P->getOpcode() == UO_Extension) { 2368 E = P->getSubExpr(); 2369 continue; 2370 } 2371 } 2372 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2373 if (!P->isResultDependent()) { 2374 E = P->getResultExpr(); 2375 continue; 2376 } 2377 } 2378 if (MaterializeTemporaryExpr *Materialize 2379 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2380 E = Materialize->GetTemporaryExpr(); 2381 continue; 2382 } 2383 if (SubstNonTypeTemplateParmExpr *NTTP 2384 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2385 E = NTTP->getReplacement(); 2386 continue; 2387 } 2388 return E; 2389 } 2390} 2391 2392Expr *Expr::IgnoreConversionOperator() { 2393 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) { 2394 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl())) 2395 return MCE->getImplicitObjectArgument(); 2396 } 2397 return this; 2398} 2399 2400/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 2401/// value (including ptr->int casts of the same size). Strip off any 2402/// ParenExpr or CastExprs, returning their operand. 2403Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 2404 Expr *E = this; 2405 while (true) { 2406 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2407 E = P->getSubExpr(); 2408 continue; 2409 } 2410 2411 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2412 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 2413 // ptr<->int casts of the same width. We also ignore all identity casts. 2414 Expr *SE = P->getSubExpr(); 2415 2416 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 2417 E = SE; 2418 continue; 2419 } 2420 2421 if ((E->getType()->isPointerType() || 2422 E->getType()->isIntegralType(Ctx)) && 2423 (SE->getType()->isPointerType() || 2424 SE->getType()->isIntegralType(Ctx)) && 2425 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 2426 E = SE; 2427 continue; 2428 } 2429 } 2430 2431 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2432 if (P->getOpcode() == UO_Extension) { 2433 E = P->getSubExpr(); 2434 continue; 2435 } 2436 } 2437 2438 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2439 if (!P->isResultDependent()) { 2440 E = P->getResultExpr(); 2441 continue; 2442 } 2443 } 2444 2445 if (SubstNonTypeTemplateParmExpr *NTTP 2446 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2447 E = NTTP->getReplacement(); 2448 continue; 2449 } 2450 2451 return E; 2452 } 2453} 2454 2455bool Expr::isDefaultArgument() const { 2456 const Expr *E = this; 2457 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2458 E = M->GetTemporaryExpr(); 2459 2460 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 2461 E = ICE->getSubExprAsWritten(); 2462 2463 return isa<CXXDefaultArgExpr>(E); 2464} 2465 2466/// \brief Skip over any no-op casts and any temporary-binding 2467/// expressions. 2468static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 2469 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2470 E = M->GetTemporaryExpr(); 2471 2472 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2473 if (ICE->getCastKind() == CK_NoOp) 2474 E = ICE->getSubExpr(); 2475 else 2476 break; 2477 } 2478 2479 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2480 E = BE->getSubExpr(); 2481 2482 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2483 if (ICE->getCastKind() == CK_NoOp) 2484 E = ICE->getSubExpr(); 2485 else 2486 break; 2487 } 2488 2489 return E->IgnoreParens(); 2490} 2491 2492/// isTemporaryObject - Determines if this expression produces a 2493/// temporary of the given class type. 2494bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2495 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2496 return false; 2497 2498 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2499 2500 // Temporaries are by definition pr-values of class type. 2501 if (!E->Classify(C).isPRValue()) { 2502 // In this context, property reference is a message call and is pr-value. 2503 if (!isa<ObjCPropertyRefExpr>(E)) 2504 return false; 2505 } 2506 2507 // Black-list a few cases which yield pr-values of class type that don't 2508 // refer to temporaries of that type: 2509 2510 // - implicit derived-to-base conversions 2511 if (isa<ImplicitCastExpr>(E)) { 2512 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2513 case CK_DerivedToBase: 2514 case CK_UncheckedDerivedToBase: 2515 return false; 2516 default: 2517 break; 2518 } 2519 } 2520 2521 // - member expressions (all) 2522 if (isa<MemberExpr>(E)) 2523 return false; 2524 2525 // - opaque values (all) 2526 if (isa<OpaqueValueExpr>(E)) 2527 return false; 2528 2529 return true; 2530} 2531 2532bool Expr::isImplicitCXXThis() const { 2533 const Expr *E = this; 2534 2535 // Strip away parentheses and casts we don't care about. 2536 while (true) { 2537 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2538 E = Paren->getSubExpr(); 2539 continue; 2540 } 2541 2542 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2543 if (ICE->getCastKind() == CK_NoOp || 2544 ICE->getCastKind() == CK_LValueToRValue || 2545 ICE->getCastKind() == CK_DerivedToBase || 2546 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2547 E = ICE->getSubExpr(); 2548 continue; 2549 } 2550 } 2551 2552 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2553 if (UnOp->getOpcode() == UO_Extension) { 2554 E = UnOp->getSubExpr(); 2555 continue; 2556 } 2557 } 2558 2559 if (const MaterializeTemporaryExpr *M 2560 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2561 E = M->GetTemporaryExpr(); 2562 continue; 2563 } 2564 2565 break; 2566 } 2567 2568 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2569 return This->isImplicit(); 2570 2571 return false; 2572} 2573 2574/// hasAnyTypeDependentArguments - Determines if any of the expressions 2575/// in Exprs is type-dependent. 2576bool Expr::hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs) { 2577 for (unsigned I = 0; I < Exprs.size(); ++I) 2578 if (Exprs[I]->isTypeDependent()) 2579 return true; 2580 2581 return false; 2582} 2583 2584bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2585 // This function is attempting whether an expression is an initializer 2586 // which can be evaluated at compile-time. isEvaluatable handles most 2587 // of the cases, but it can't deal with some initializer-specific 2588 // expressions, and it can't deal with aggregates; we deal with those here, 2589 // and fall back to isEvaluatable for the other cases. 2590 2591 // If we ever capture reference-binding directly in the AST, we can 2592 // kill the second parameter. 2593 2594 if (IsForRef) { 2595 EvalResult Result; 2596 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2597 } 2598 2599 switch (getStmtClass()) { 2600 default: break; 2601 case IntegerLiteralClass: 2602 case FloatingLiteralClass: 2603 case StringLiteralClass: 2604 case ObjCStringLiteralClass: 2605 case ObjCEncodeExprClass: 2606 return true; 2607 case CXXTemporaryObjectExprClass: 2608 case CXXConstructExprClass: { 2609 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2610 2611 // Only if it's 2612 if (CE->getConstructor()->isTrivial()) { 2613 // 1) an application of the trivial default constructor or 2614 if (!CE->getNumArgs()) return true; 2615 2616 // 2) an elidable trivial copy construction of an operand which is 2617 // itself a constant initializer. Note that we consider the 2618 // operand on its own, *not* as a reference binding. 2619 if (CE->isElidable() && 2620 CE->getArg(0)->isConstantInitializer(Ctx, false)) 2621 return true; 2622 } 2623 2624 // 3) a foldable constexpr constructor. 2625 break; 2626 } 2627 case CompoundLiteralExprClass: { 2628 // This handles gcc's extension that allows global initializers like 2629 // "struct x {int x;} x = (struct x) {};". 2630 // FIXME: This accepts other cases it shouldn't! 2631 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2632 return Exp->isConstantInitializer(Ctx, false); 2633 } 2634 case InitListExprClass: { 2635 // FIXME: This doesn't deal with fields with reference types correctly. 2636 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2637 // to bitfields. 2638 const InitListExpr *Exp = cast<InitListExpr>(this); 2639 unsigned numInits = Exp->getNumInits(); 2640 for (unsigned i = 0; i < numInits; i++) { 2641 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2642 return false; 2643 } 2644 return true; 2645 } 2646 case ImplicitValueInitExprClass: 2647 return true; 2648 case ParenExprClass: 2649 return cast<ParenExpr>(this)->getSubExpr() 2650 ->isConstantInitializer(Ctx, IsForRef); 2651 case GenericSelectionExprClass: 2652 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2653 return false; 2654 return cast<GenericSelectionExpr>(this)->getResultExpr() 2655 ->isConstantInitializer(Ctx, IsForRef); 2656 case ChooseExprClass: 2657 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2658 ->isConstantInitializer(Ctx, IsForRef); 2659 case UnaryOperatorClass: { 2660 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2661 if (Exp->getOpcode() == UO_Extension) 2662 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2663 break; 2664 } 2665 case CXXFunctionalCastExprClass: 2666 case CXXStaticCastExprClass: 2667 case ImplicitCastExprClass: 2668 case CStyleCastExprClass: { 2669 const CastExpr *CE = cast<CastExpr>(this); 2670 2671 // If we're promoting an integer to an _Atomic type then this is constant 2672 // if the integer is constant. We also need to check the converse in case 2673 // someone does something like: 2674 // 2675 // int a = (_Atomic(int))42; 2676 // 2677 // I doubt anyone would write code like this directly, but it's quite 2678 // possible as the result of macro expansions. 2679 if (CE->getCastKind() == CK_NonAtomicToAtomic || 2680 CE->getCastKind() == CK_AtomicToNonAtomic) 2681 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2682 2683 // Handle bitcasts of vector constants. 2684 if (getType()->isVectorType() && CE->getCastKind() == CK_BitCast) 2685 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2686 2687 // Handle misc casts we want to ignore. 2688 // FIXME: Is it really safe to ignore all these? 2689 if (CE->getCastKind() == CK_NoOp || 2690 CE->getCastKind() == CK_LValueToRValue || 2691 CE->getCastKind() == CK_ToUnion || 2692 CE->getCastKind() == CK_ConstructorConversion) 2693 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2694 2695 break; 2696 } 2697 case MaterializeTemporaryExprClass: 2698 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr() 2699 ->isConstantInitializer(Ctx, false); 2700 } 2701 return isEvaluatable(Ctx); 2702} 2703 2704namespace { 2705 /// \brief Look for a call to a non-trivial function within an expression. 2706 class NonTrivialCallFinder : public EvaluatedExprVisitor<NonTrivialCallFinder> 2707 { 2708 typedef EvaluatedExprVisitor<NonTrivialCallFinder> Inherited; 2709 2710 bool NonTrivial; 2711 2712 public: 2713 explicit NonTrivialCallFinder(ASTContext &Context) 2714 : Inherited(Context), NonTrivial(false) { } 2715 2716 bool hasNonTrivialCall() const { return NonTrivial; } 2717 2718 void VisitCallExpr(CallExpr *E) { 2719 if (CXXMethodDecl *Method 2720 = dyn_cast_or_null<CXXMethodDecl>(E->getCalleeDecl())) { 2721 if (Method->isTrivial()) { 2722 // Recurse to children of the call. 2723 Inherited::VisitStmt(E); 2724 return; 2725 } 2726 } 2727 2728 NonTrivial = true; 2729 } 2730 2731 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2732 if (E->getConstructor()->isTrivial()) { 2733 // Recurse to children of the call. 2734 Inherited::VisitStmt(E); 2735 return; 2736 } 2737 2738 NonTrivial = true; 2739 } 2740 2741 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 2742 if (E->getTemporary()->getDestructor()->isTrivial()) { 2743 Inherited::VisitStmt(E); 2744 return; 2745 } 2746 2747 NonTrivial = true; 2748 } 2749 }; 2750} 2751 2752bool Expr::hasNonTrivialCall(ASTContext &Ctx) { 2753 NonTrivialCallFinder Finder(Ctx); 2754 Finder.Visit(this); 2755 return Finder.hasNonTrivialCall(); 2756} 2757 2758/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2759/// pointer constant or not, as well as the specific kind of constant detected. 2760/// Null pointer constants can be integer constant expressions with the 2761/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2762/// (a GNU extension). 2763Expr::NullPointerConstantKind 2764Expr::isNullPointerConstant(ASTContext &Ctx, 2765 NullPointerConstantValueDependence NPC) const { 2766 if (isValueDependent()) { 2767 switch (NPC) { 2768 case NPC_NeverValueDependent: 2769 llvm_unreachable("Unexpected value dependent expression!"); 2770 case NPC_ValueDependentIsNull: 2771 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2772 return NPCK_ZeroInteger; 2773 else 2774 return NPCK_NotNull; 2775 2776 case NPC_ValueDependentIsNotNull: 2777 return NPCK_NotNull; 2778 } 2779 } 2780 2781 // Strip off a cast to void*, if it exists. Except in C++. 2782 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2783 if (!Ctx.getLangOpts().CPlusPlus) { 2784 // Check that it is a cast to void*. 2785 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2786 QualType Pointee = PT->getPointeeType(); 2787 if (!Pointee.hasQualifiers() && 2788 Pointee->isVoidType() && // to void* 2789 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2790 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2791 } 2792 } 2793 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2794 // Ignore the ImplicitCastExpr type entirely. 2795 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2796 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2797 // Accept ((void*)0) as a null pointer constant, as many other 2798 // implementations do. 2799 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2800 } else if (const GenericSelectionExpr *GE = 2801 dyn_cast<GenericSelectionExpr>(this)) { 2802 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC); 2803 } else if (const CXXDefaultArgExpr *DefaultArg 2804 = dyn_cast<CXXDefaultArgExpr>(this)) { 2805 // See through default argument expressions 2806 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2807 } else if (isa<GNUNullExpr>(this)) { 2808 // The GNU __null extension is always a null pointer constant. 2809 return NPCK_GNUNull; 2810 } else if (const MaterializeTemporaryExpr *M 2811 = dyn_cast<MaterializeTemporaryExpr>(this)) { 2812 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC); 2813 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) { 2814 if (const Expr *Source = OVE->getSourceExpr()) 2815 return Source->isNullPointerConstant(Ctx, NPC); 2816 } 2817 2818 // C++0x nullptr_t is always a null pointer constant. 2819 if (getType()->isNullPtrType()) 2820 return NPCK_CXX0X_nullptr; 2821 2822 if (const RecordType *UT = getType()->getAsUnionType()) 2823 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2824 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2825 const Expr *InitExpr = CLE->getInitializer(); 2826 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2827 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2828 } 2829 // This expression must be an integer type. 2830 if (!getType()->isIntegerType() || 2831 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType())) 2832 return NPCK_NotNull; 2833 2834 // If we have an integer constant expression, we need to *evaluate* it and 2835 // test for the value 0. Don't use the C++11 constant expression semantics 2836 // for this, for now; once the dust settles on core issue 903, we might only 2837 // allow a literal 0 here in C++11 mode. 2838 if (Ctx.getLangOpts().CPlusPlus0x) { 2839 if (!isCXX98IntegralConstantExpr(Ctx)) 2840 return NPCK_NotNull; 2841 } else { 2842 if (!isIntegerConstantExpr(Ctx)) 2843 return NPCK_NotNull; 2844 } 2845 2846 return (EvaluateKnownConstInt(Ctx) == 0) ? NPCK_ZeroInteger : NPCK_NotNull; 2847} 2848 2849/// \brief If this expression is an l-value for an Objective C 2850/// property, find the underlying property reference expression. 2851const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2852 const Expr *E = this; 2853 while (true) { 2854 assert((E->getValueKind() == VK_LValue && 2855 E->getObjectKind() == OK_ObjCProperty) && 2856 "expression is not a property reference"); 2857 E = E->IgnoreParenCasts(); 2858 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2859 if (BO->getOpcode() == BO_Comma) { 2860 E = BO->getRHS(); 2861 continue; 2862 } 2863 } 2864 2865 break; 2866 } 2867 2868 return cast<ObjCPropertyRefExpr>(E); 2869} 2870 2871FieldDecl *Expr::getBitField() { 2872 Expr *E = this->IgnoreParens(); 2873 2874 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2875 if (ICE->getCastKind() == CK_LValueToRValue || 2876 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2877 E = ICE->getSubExpr()->IgnoreParens(); 2878 else 2879 break; 2880 } 2881 2882 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2883 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2884 if (Field->isBitField()) 2885 return Field; 2886 2887 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2888 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2889 if (Field->isBitField()) 2890 return Field; 2891 2892 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) { 2893 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2894 return BinOp->getLHS()->getBitField(); 2895 2896 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS()) 2897 return BinOp->getRHS()->getBitField(); 2898 } 2899 2900 return 0; 2901} 2902 2903bool Expr::refersToVectorElement() const { 2904 const Expr *E = this->IgnoreParens(); 2905 2906 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2907 if (ICE->getValueKind() != VK_RValue && 2908 ICE->getCastKind() == CK_NoOp) 2909 E = ICE->getSubExpr()->IgnoreParens(); 2910 else 2911 break; 2912 } 2913 2914 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2915 return ASE->getBase()->getType()->isVectorType(); 2916 2917 if (isa<ExtVectorElementExpr>(E)) 2918 return true; 2919 2920 return false; 2921} 2922 2923/// isArrow - Return true if the base expression is a pointer to vector, 2924/// return false if the base expression is a vector. 2925bool ExtVectorElementExpr::isArrow() const { 2926 return getBase()->getType()->isPointerType(); 2927} 2928 2929unsigned ExtVectorElementExpr::getNumElements() const { 2930 if (const VectorType *VT = getType()->getAs<VectorType>()) 2931 return VT->getNumElements(); 2932 return 1; 2933} 2934 2935/// containsDuplicateElements - Return true if any element access is repeated. 2936bool ExtVectorElementExpr::containsDuplicateElements() const { 2937 // FIXME: Refactor this code to an accessor on the AST node which returns the 2938 // "type" of component access, and share with code below and in Sema. 2939 StringRef Comp = Accessor->getName(); 2940 2941 // Halving swizzles do not contain duplicate elements. 2942 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2943 return false; 2944 2945 // Advance past s-char prefix on hex swizzles. 2946 if (Comp[0] == 's' || Comp[0] == 'S') 2947 Comp = Comp.substr(1); 2948 2949 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2950 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos) 2951 return true; 2952 2953 return false; 2954} 2955 2956/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2957void ExtVectorElementExpr::getEncodedElementAccess( 2958 SmallVectorImpl<unsigned> &Elts) const { 2959 StringRef Comp = Accessor->getName(); 2960 if (Comp[0] == 's' || Comp[0] == 'S') 2961 Comp = Comp.substr(1); 2962 2963 bool isHi = Comp == "hi"; 2964 bool isLo = Comp == "lo"; 2965 bool isEven = Comp == "even"; 2966 bool isOdd = Comp == "odd"; 2967 2968 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2969 uint64_t Index; 2970 2971 if (isHi) 2972 Index = e + i; 2973 else if (isLo) 2974 Index = i; 2975 else if (isEven) 2976 Index = 2 * i; 2977 else if (isOdd) 2978 Index = 2 * i + 1; 2979 else 2980 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2981 2982 Elts.push_back(Index); 2983 } 2984} 2985 2986ObjCMessageExpr::ObjCMessageExpr(QualType T, 2987 ExprValueKind VK, 2988 SourceLocation LBracLoc, 2989 SourceLocation SuperLoc, 2990 bool IsInstanceSuper, 2991 QualType SuperType, 2992 Selector Sel, 2993 ArrayRef<SourceLocation> SelLocs, 2994 SelectorLocationsKind SelLocsK, 2995 ObjCMethodDecl *Method, 2996 ArrayRef<Expr *> Args, 2997 SourceLocation RBracLoc, 2998 bool isImplicit) 2999 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 3000 /*TypeDependent=*/false, /*ValueDependent=*/false, 3001 /*InstantiationDependent=*/false, 3002 /*ContainsUnexpandedParameterPack=*/false), 3003 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3004 : Sel.getAsOpaquePtr())), 3005 Kind(IsInstanceSuper? SuperInstance : SuperClass), 3006 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3007 SuperLoc(SuperLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3008{ 3009 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3010 setReceiverPointer(SuperType.getAsOpaquePtr()); 3011} 3012 3013ObjCMessageExpr::ObjCMessageExpr(QualType T, 3014 ExprValueKind VK, 3015 SourceLocation LBracLoc, 3016 TypeSourceInfo *Receiver, 3017 Selector Sel, 3018 ArrayRef<SourceLocation> SelLocs, 3019 SelectorLocationsKind SelLocsK, 3020 ObjCMethodDecl *Method, 3021 ArrayRef<Expr *> Args, 3022 SourceLocation RBracLoc, 3023 bool isImplicit) 3024 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 3025 T->isDependentType(), T->isInstantiationDependentType(), 3026 T->containsUnexpandedParameterPack()), 3027 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3028 : Sel.getAsOpaquePtr())), 3029 Kind(Class), 3030 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3031 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3032{ 3033 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3034 setReceiverPointer(Receiver); 3035} 3036 3037ObjCMessageExpr::ObjCMessageExpr(QualType T, 3038 ExprValueKind VK, 3039 SourceLocation LBracLoc, 3040 Expr *Receiver, 3041 Selector Sel, 3042 ArrayRef<SourceLocation> SelLocs, 3043 SelectorLocationsKind SelLocsK, 3044 ObjCMethodDecl *Method, 3045 ArrayRef<Expr *> Args, 3046 SourceLocation RBracLoc, 3047 bool isImplicit) 3048 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 3049 Receiver->isTypeDependent(), 3050 Receiver->isInstantiationDependent(), 3051 Receiver->containsUnexpandedParameterPack()), 3052 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3053 : Sel.getAsOpaquePtr())), 3054 Kind(Instance), 3055 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3056 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3057{ 3058 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3059 setReceiverPointer(Receiver); 3060} 3061 3062void ObjCMessageExpr::initArgsAndSelLocs(ArrayRef<Expr *> Args, 3063 ArrayRef<SourceLocation> SelLocs, 3064 SelectorLocationsKind SelLocsK) { 3065 setNumArgs(Args.size()); 3066 Expr **MyArgs = getArgs(); 3067 for (unsigned I = 0; I != Args.size(); ++I) { 3068 if (Args[I]->isTypeDependent()) 3069 ExprBits.TypeDependent = true; 3070 if (Args[I]->isValueDependent()) 3071 ExprBits.ValueDependent = true; 3072 if (Args[I]->isInstantiationDependent()) 3073 ExprBits.InstantiationDependent = true; 3074 if (Args[I]->containsUnexpandedParameterPack()) 3075 ExprBits.ContainsUnexpandedParameterPack = true; 3076 3077 MyArgs[I] = Args[I]; 3078 } 3079 3080 SelLocsKind = SelLocsK; 3081 if (!isImplicit()) { 3082 if (SelLocsK == SelLoc_NonStandard) 3083 std::copy(SelLocs.begin(), SelLocs.end(), getStoredSelLocs()); 3084 } 3085} 3086 3087ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3088 ExprValueKind VK, 3089 SourceLocation LBracLoc, 3090 SourceLocation SuperLoc, 3091 bool IsInstanceSuper, 3092 QualType SuperType, 3093 Selector Sel, 3094 ArrayRef<SourceLocation> SelLocs, 3095 ObjCMethodDecl *Method, 3096 ArrayRef<Expr *> Args, 3097 SourceLocation RBracLoc, 3098 bool isImplicit) { 3099 assert((!SelLocs.empty() || isImplicit) && 3100 "No selector locs for non-implicit message"); 3101 ObjCMessageExpr *Mem; 3102 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3103 if (isImplicit) 3104 Mem = alloc(Context, Args.size(), 0); 3105 else 3106 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3107 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 3108 SuperType, Sel, SelLocs, SelLocsK, 3109 Method, Args, RBracLoc, isImplicit); 3110} 3111 3112ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3113 ExprValueKind VK, 3114 SourceLocation LBracLoc, 3115 TypeSourceInfo *Receiver, 3116 Selector Sel, 3117 ArrayRef<SourceLocation> SelLocs, 3118 ObjCMethodDecl *Method, 3119 ArrayRef<Expr *> Args, 3120 SourceLocation RBracLoc, 3121 bool isImplicit) { 3122 assert((!SelLocs.empty() || isImplicit) && 3123 "No selector locs for non-implicit message"); 3124 ObjCMessageExpr *Mem; 3125 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3126 if (isImplicit) 3127 Mem = alloc(Context, Args.size(), 0); 3128 else 3129 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3130 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3131 SelLocs, SelLocsK, Method, Args, RBracLoc, 3132 isImplicit); 3133} 3134 3135ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3136 ExprValueKind VK, 3137 SourceLocation LBracLoc, 3138 Expr *Receiver, 3139 Selector Sel, 3140 ArrayRef<SourceLocation> SelLocs, 3141 ObjCMethodDecl *Method, 3142 ArrayRef<Expr *> Args, 3143 SourceLocation RBracLoc, 3144 bool isImplicit) { 3145 assert((!SelLocs.empty() || isImplicit) && 3146 "No selector locs for non-implicit message"); 3147 ObjCMessageExpr *Mem; 3148 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3149 if (isImplicit) 3150 Mem = alloc(Context, Args.size(), 0); 3151 else 3152 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3153 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3154 SelLocs, SelLocsK, Method, Args, RBracLoc, 3155 isImplicit); 3156} 3157 3158ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 3159 unsigned NumArgs, 3160 unsigned NumStoredSelLocs) { 3161 ObjCMessageExpr *Mem = alloc(Context, NumArgs, NumStoredSelLocs); 3162 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 3163} 3164 3165ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3166 ArrayRef<Expr *> Args, 3167 SourceLocation RBraceLoc, 3168 ArrayRef<SourceLocation> SelLocs, 3169 Selector Sel, 3170 SelectorLocationsKind &SelLocsK) { 3171 SelLocsK = hasStandardSelectorLocs(Sel, SelLocs, Args, RBraceLoc); 3172 unsigned NumStoredSelLocs = (SelLocsK == SelLoc_NonStandard) ? SelLocs.size() 3173 : 0; 3174 return alloc(C, Args.size(), NumStoredSelLocs); 3175} 3176 3177ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3178 unsigned NumArgs, 3179 unsigned NumStoredSelLocs) { 3180 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 3181 NumArgs * sizeof(Expr *) + NumStoredSelLocs * sizeof(SourceLocation); 3182 return (ObjCMessageExpr *)C.Allocate(Size, 3183 llvm::AlignOf<ObjCMessageExpr>::Alignment); 3184} 3185 3186void ObjCMessageExpr::getSelectorLocs( 3187 SmallVectorImpl<SourceLocation> &SelLocs) const { 3188 for (unsigned i = 0, e = getNumSelectorLocs(); i != e; ++i) 3189 SelLocs.push_back(getSelectorLoc(i)); 3190} 3191 3192SourceRange ObjCMessageExpr::getReceiverRange() const { 3193 switch (getReceiverKind()) { 3194 case Instance: 3195 return getInstanceReceiver()->getSourceRange(); 3196 3197 case Class: 3198 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 3199 3200 case SuperInstance: 3201 case SuperClass: 3202 return getSuperLoc(); 3203 } 3204 3205 llvm_unreachable("Invalid ReceiverKind!"); 3206} 3207 3208Selector ObjCMessageExpr::getSelector() const { 3209 if (HasMethod) 3210 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 3211 ->getSelector(); 3212 return Selector(SelectorOrMethod); 3213} 3214 3215ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 3216 switch (getReceiverKind()) { 3217 case Instance: 3218 if (const ObjCObjectPointerType *Ptr 3219 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 3220 return Ptr->getInterfaceDecl(); 3221 break; 3222 3223 case Class: 3224 if (const ObjCObjectType *Ty 3225 = getClassReceiver()->getAs<ObjCObjectType>()) 3226 return Ty->getInterface(); 3227 break; 3228 3229 case SuperInstance: 3230 if (const ObjCObjectPointerType *Ptr 3231 = getSuperType()->getAs<ObjCObjectPointerType>()) 3232 return Ptr->getInterfaceDecl(); 3233 break; 3234 3235 case SuperClass: 3236 if (const ObjCObjectType *Iface 3237 = getSuperType()->getAs<ObjCObjectType>()) 3238 return Iface->getInterface(); 3239 break; 3240 } 3241 3242 return 0; 3243} 3244 3245StringRef ObjCBridgedCastExpr::getBridgeKindName() const { 3246 switch (getBridgeKind()) { 3247 case OBC_Bridge: 3248 return "__bridge"; 3249 case OBC_BridgeTransfer: 3250 return "__bridge_transfer"; 3251 case OBC_BridgeRetained: 3252 return "__bridge_retained"; 3253 } 3254 3255 llvm_unreachable("Invalid BridgeKind!"); 3256} 3257 3258bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 3259 return getCond()->EvaluateKnownConstInt(C) != 0; 3260} 3261 3262ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3263 QualType Type, SourceLocation BLoc, 3264 SourceLocation RP) 3265 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 3266 Type->isDependentType(), Type->isDependentType(), 3267 Type->isInstantiationDependentType(), 3268 Type->containsUnexpandedParameterPack()), 3269 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 3270{ 3271 SubExprs = new (C) Stmt*[nexpr]; 3272 for (unsigned i = 0; i < nexpr; i++) { 3273 if (args[i]->isTypeDependent()) 3274 ExprBits.TypeDependent = true; 3275 if (args[i]->isValueDependent()) 3276 ExprBits.ValueDependent = true; 3277 if (args[i]->isInstantiationDependent()) 3278 ExprBits.InstantiationDependent = true; 3279 if (args[i]->containsUnexpandedParameterPack()) 3280 ExprBits.ContainsUnexpandedParameterPack = true; 3281 3282 SubExprs[i] = args[i]; 3283 } 3284} 3285 3286void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 3287 unsigned NumExprs) { 3288 if (SubExprs) C.Deallocate(SubExprs); 3289 3290 SubExprs = new (C) Stmt* [NumExprs]; 3291 this->NumExprs = NumExprs; 3292 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 3293} 3294 3295GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3296 SourceLocation GenericLoc, Expr *ControllingExpr, 3297 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3298 unsigned NumAssocs, SourceLocation DefaultLoc, 3299 SourceLocation RParenLoc, 3300 bool ContainsUnexpandedParameterPack, 3301 unsigned ResultIndex) 3302 : Expr(GenericSelectionExprClass, 3303 AssocExprs[ResultIndex]->getType(), 3304 AssocExprs[ResultIndex]->getValueKind(), 3305 AssocExprs[ResultIndex]->getObjectKind(), 3306 AssocExprs[ResultIndex]->isTypeDependent(), 3307 AssocExprs[ResultIndex]->isValueDependent(), 3308 AssocExprs[ResultIndex]->isInstantiationDependent(), 3309 ContainsUnexpandedParameterPack), 3310 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3311 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3312 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3313 RParenLoc(RParenLoc) { 3314 SubExprs[CONTROLLING] = ControllingExpr; 3315 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3316 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3317} 3318 3319GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3320 SourceLocation GenericLoc, Expr *ControllingExpr, 3321 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3322 unsigned NumAssocs, SourceLocation DefaultLoc, 3323 SourceLocation RParenLoc, 3324 bool ContainsUnexpandedParameterPack) 3325 : Expr(GenericSelectionExprClass, 3326 Context.DependentTy, 3327 VK_RValue, 3328 OK_Ordinary, 3329 /*isTypeDependent=*/true, 3330 /*isValueDependent=*/true, 3331 /*isInstantiationDependent=*/true, 3332 ContainsUnexpandedParameterPack), 3333 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3334 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3335 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3336 RParenLoc(RParenLoc) { 3337 SubExprs[CONTROLLING] = ControllingExpr; 3338 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3339 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3340} 3341 3342//===----------------------------------------------------------------------===// 3343// DesignatedInitExpr 3344//===----------------------------------------------------------------------===// 3345 3346IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const { 3347 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3348 if (Field.NameOrField & 0x01) 3349 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 3350 else 3351 return getField()->getIdentifier(); 3352} 3353 3354DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 3355 unsigned NumDesignators, 3356 const Designator *Designators, 3357 SourceLocation EqualOrColonLoc, 3358 bool GNUSyntax, 3359 Expr **IndexExprs, 3360 unsigned NumIndexExprs, 3361 Expr *Init) 3362 : Expr(DesignatedInitExprClass, Ty, 3363 Init->getValueKind(), Init->getObjectKind(), 3364 Init->isTypeDependent(), Init->isValueDependent(), 3365 Init->isInstantiationDependent(), 3366 Init->containsUnexpandedParameterPack()), 3367 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 3368 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 3369 this->Designators = new (C) Designator[NumDesignators]; 3370 3371 // Record the initializer itself. 3372 child_range Child = children(); 3373 *Child++ = Init; 3374 3375 // Copy the designators and their subexpressions, computing 3376 // value-dependence along the way. 3377 unsigned IndexIdx = 0; 3378 for (unsigned I = 0; I != NumDesignators; ++I) { 3379 this->Designators[I] = Designators[I]; 3380 3381 if (this->Designators[I].isArrayDesignator()) { 3382 // Compute type- and value-dependence. 3383 Expr *Index = IndexExprs[IndexIdx]; 3384 if (Index->isTypeDependent() || Index->isValueDependent()) 3385 ExprBits.ValueDependent = true; 3386 if (Index->isInstantiationDependent()) 3387 ExprBits.InstantiationDependent = true; 3388 // Propagate unexpanded parameter packs. 3389 if (Index->containsUnexpandedParameterPack()) 3390 ExprBits.ContainsUnexpandedParameterPack = true; 3391 3392 // Copy the index expressions into permanent storage. 3393 *Child++ = IndexExprs[IndexIdx++]; 3394 } else if (this->Designators[I].isArrayRangeDesignator()) { 3395 // Compute type- and value-dependence. 3396 Expr *Start = IndexExprs[IndexIdx]; 3397 Expr *End = IndexExprs[IndexIdx + 1]; 3398 if (Start->isTypeDependent() || Start->isValueDependent() || 3399 End->isTypeDependent() || End->isValueDependent()) { 3400 ExprBits.ValueDependent = true; 3401 ExprBits.InstantiationDependent = true; 3402 } else if (Start->isInstantiationDependent() || 3403 End->isInstantiationDependent()) { 3404 ExprBits.InstantiationDependent = true; 3405 } 3406 3407 // Propagate unexpanded parameter packs. 3408 if (Start->containsUnexpandedParameterPack() || 3409 End->containsUnexpandedParameterPack()) 3410 ExprBits.ContainsUnexpandedParameterPack = true; 3411 3412 // Copy the start/end expressions into permanent storage. 3413 *Child++ = IndexExprs[IndexIdx++]; 3414 *Child++ = IndexExprs[IndexIdx++]; 3415 } 3416 } 3417 3418 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 3419} 3420 3421DesignatedInitExpr * 3422DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 3423 unsigned NumDesignators, 3424 Expr **IndexExprs, unsigned NumIndexExprs, 3425 SourceLocation ColonOrEqualLoc, 3426 bool UsesColonSyntax, Expr *Init) { 3427 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3428 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3429 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 3430 ColonOrEqualLoc, UsesColonSyntax, 3431 IndexExprs, NumIndexExprs, Init); 3432} 3433 3434DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 3435 unsigned NumIndexExprs) { 3436 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3437 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3438 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 3439} 3440 3441void DesignatedInitExpr::setDesignators(ASTContext &C, 3442 const Designator *Desigs, 3443 unsigned NumDesigs) { 3444 Designators = new (C) Designator[NumDesigs]; 3445 NumDesignators = NumDesigs; 3446 for (unsigned I = 0; I != NumDesigs; ++I) 3447 Designators[I] = Desigs[I]; 3448} 3449 3450SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { 3451 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this); 3452 if (size() == 1) 3453 return DIE->getDesignator(0)->getSourceRange(); 3454 return SourceRange(DIE->getDesignator(0)->getStartLocation(), 3455 DIE->getDesignator(size()-1)->getEndLocation()); 3456} 3457 3458SourceRange DesignatedInitExpr::getSourceRange() const { 3459 SourceLocation StartLoc; 3460 Designator &First = 3461 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 3462 if (First.isFieldDesignator()) { 3463 if (GNUSyntax) 3464 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 3465 else 3466 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 3467 } else 3468 StartLoc = 3469 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 3470 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 3471} 3472 3473Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 3474 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 3475 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3476 Ptr += sizeof(DesignatedInitExpr); 3477 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3478 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3479} 3480 3481Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 3482 assert(D.Kind == Designator::ArrayRangeDesignator && 3483 "Requires array range designator"); 3484 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3485 Ptr += sizeof(DesignatedInitExpr); 3486 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3487 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3488} 3489 3490Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 3491 assert(D.Kind == Designator::ArrayRangeDesignator && 3492 "Requires array range designator"); 3493 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3494 Ptr += sizeof(DesignatedInitExpr); 3495 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3496 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 3497} 3498 3499/// \brief Replaces the designator at index @p Idx with the series 3500/// of designators in [First, Last). 3501void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 3502 const Designator *First, 3503 const Designator *Last) { 3504 unsigned NumNewDesignators = Last - First; 3505 if (NumNewDesignators == 0) { 3506 std::copy_backward(Designators + Idx + 1, 3507 Designators + NumDesignators, 3508 Designators + Idx); 3509 --NumNewDesignators; 3510 return; 3511 } else if (NumNewDesignators == 1) { 3512 Designators[Idx] = *First; 3513 return; 3514 } 3515 3516 Designator *NewDesignators 3517 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 3518 std::copy(Designators, Designators + Idx, NewDesignators); 3519 std::copy(First, Last, NewDesignators + Idx); 3520 std::copy(Designators + Idx + 1, Designators + NumDesignators, 3521 NewDesignators + Idx + NumNewDesignators); 3522 Designators = NewDesignators; 3523 NumDesignators = NumDesignators - 1 + NumNewDesignators; 3524} 3525 3526ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 3527 Expr **exprs, unsigned nexprs, 3528 SourceLocation rparenloc) 3529 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 3530 false, false, false, false), 3531 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 3532 Exprs = new (C) Stmt*[nexprs]; 3533 for (unsigned i = 0; i != nexprs; ++i) { 3534 if (exprs[i]->isTypeDependent()) 3535 ExprBits.TypeDependent = true; 3536 if (exprs[i]->isValueDependent()) 3537 ExprBits.ValueDependent = true; 3538 if (exprs[i]->isInstantiationDependent()) 3539 ExprBits.InstantiationDependent = true; 3540 if (exprs[i]->containsUnexpandedParameterPack()) 3541 ExprBits.ContainsUnexpandedParameterPack = true; 3542 3543 Exprs[i] = exprs[i]; 3544 } 3545} 3546 3547const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 3548 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 3549 e = ewc->getSubExpr(); 3550 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e)) 3551 e = m->GetTemporaryExpr(); 3552 e = cast<CXXConstructExpr>(e)->getArg(0); 3553 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3554 e = ice->getSubExpr(); 3555 return cast<OpaqueValueExpr>(e); 3556} 3557 3558PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &Context, EmptyShell sh, 3559 unsigned numSemanticExprs) { 3560 void *buffer = Context.Allocate(sizeof(PseudoObjectExpr) + 3561 (1 + numSemanticExprs) * sizeof(Expr*), 3562 llvm::alignOf<PseudoObjectExpr>()); 3563 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs); 3564} 3565 3566PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs) 3567 : Expr(PseudoObjectExprClass, shell) { 3568 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1; 3569} 3570 3571PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &C, Expr *syntax, 3572 ArrayRef<Expr*> semantics, 3573 unsigned resultIndex) { 3574 assert(syntax && "no syntactic expression!"); 3575 assert(semantics.size() && "no semantic expressions!"); 3576 3577 QualType type; 3578 ExprValueKind VK; 3579 if (resultIndex == NoResult) { 3580 type = C.VoidTy; 3581 VK = VK_RValue; 3582 } else { 3583 assert(resultIndex < semantics.size()); 3584 type = semantics[resultIndex]->getType(); 3585 VK = semantics[resultIndex]->getValueKind(); 3586 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary); 3587 } 3588 3589 void *buffer = C.Allocate(sizeof(PseudoObjectExpr) + 3590 (1 + semantics.size()) * sizeof(Expr*), 3591 llvm::alignOf<PseudoObjectExpr>()); 3592 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics, 3593 resultIndex); 3594} 3595 3596PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK, 3597 Expr *syntax, ArrayRef<Expr*> semantics, 3598 unsigned resultIndex) 3599 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary, 3600 /*filled in at end of ctor*/ false, false, false, false) { 3601 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1; 3602 PseudoObjectExprBits.ResultIndex = resultIndex + 1; 3603 3604 for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) { 3605 Expr *E = (i == 0 ? syntax : semantics[i-1]); 3606 getSubExprsBuffer()[i] = E; 3607 3608 if (E->isTypeDependent()) 3609 ExprBits.TypeDependent = true; 3610 if (E->isValueDependent()) 3611 ExprBits.ValueDependent = true; 3612 if (E->isInstantiationDependent()) 3613 ExprBits.InstantiationDependent = true; 3614 if (E->containsUnexpandedParameterPack()) 3615 ExprBits.ContainsUnexpandedParameterPack = true; 3616 3617 if (isa<OpaqueValueExpr>(E)) 3618 assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != 0 && 3619 "opaque-value semantic expressions for pseudo-object " 3620 "operations must have sources"); 3621 } 3622} 3623 3624//===----------------------------------------------------------------------===// 3625// ExprIterator. 3626//===----------------------------------------------------------------------===// 3627 3628Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 3629Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 3630Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 3631const Expr* ConstExprIterator::operator[](size_t idx) const { 3632 return cast<Expr>(I[idx]); 3633} 3634const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 3635const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 3636 3637//===----------------------------------------------------------------------===// 3638// Child Iterators for iterating over subexpressions/substatements 3639//===----------------------------------------------------------------------===// 3640 3641// UnaryExprOrTypeTraitExpr 3642Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 3643 // If this is of a type and the type is a VLA type (and not a typedef), the 3644 // size expression of the VLA needs to be treated as an executable expression. 3645 // Why isn't this weirdness documented better in StmtIterator? 3646 if (isArgumentType()) { 3647 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 3648 getArgumentType().getTypePtr())) 3649 return child_range(child_iterator(T), child_iterator()); 3650 return child_range(); 3651 } 3652 return child_range(&Argument.Ex, &Argument.Ex + 1); 3653} 3654 3655// ObjCMessageExpr 3656Stmt::child_range ObjCMessageExpr::children() { 3657 Stmt **begin; 3658 if (getReceiverKind() == Instance) 3659 begin = reinterpret_cast<Stmt **>(this + 1); 3660 else 3661 begin = reinterpret_cast<Stmt **>(getArgs()); 3662 return child_range(begin, 3663 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 3664} 3665 3666ObjCArrayLiteral::ObjCArrayLiteral(llvm::ArrayRef<Expr *> Elements, 3667 QualType T, ObjCMethodDecl *Method, 3668 SourceRange SR) 3669 : Expr(ObjCArrayLiteralClass, T, VK_RValue, OK_Ordinary, 3670 false, false, false, false), 3671 NumElements(Elements.size()), Range(SR), ArrayWithObjectsMethod(Method) 3672{ 3673 Expr **SaveElements = getElements(); 3674 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 3675 if (Elements[I]->isTypeDependent() || Elements[I]->isValueDependent()) 3676 ExprBits.ValueDependent = true; 3677 if (Elements[I]->isInstantiationDependent()) 3678 ExprBits.InstantiationDependent = true; 3679 if (Elements[I]->containsUnexpandedParameterPack()) 3680 ExprBits.ContainsUnexpandedParameterPack = true; 3681 3682 SaveElements[I] = Elements[I]; 3683 } 3684} 3685 3686ObjCArrayLiteral *ObjCArrayLiteral::Create(ASTContext &C, 3687 llvm::ArrayRef<Expr *> Elements, 3688 QualType T, ObjCMethodDecl * Method, 3689 SourceRange SR) { 3690 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3691 + Elements.size() * sizeof(Expr *)); 3692 return new (Mem) ObjCArrayLiteral(Elements, T, Method, SR); 3693} 3694 3695ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(ASTContext &C, 3696 unsigned NumElements) { 3697 3698 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3699 + NumElements * sizeof(Expr *)); 3700 return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements); 3701} 3702 3703ObjCDictionaryLiteral::ObjCDictionaryLiteral( 3704 ArrayRef<ObjCDictionaryElement> VK, 3705 bool HasPackExpansions, 3706 QualType T, ObjCMethodDecl *method, 3707 SourceRange SR) 3708 : Expr(ObjCDictionaryLiteralClass, T, VK_RValue, OK_Ordinary, false, false, 3709 false, false), 3710 NumElements(VK.size()), HasPackExpansions(HasPackExpansions), Range(SR), 3711 DictWithObjectsMethod(method) 3712{ 3713 KeyValuePair *KeyValues = getKeyValues(); 3714 ExpansionData *Expansions = getExpansionData(); 3715 for (unsigned I = 0; I < NumElements; I++) { 3716 if (VK[I].Key->isTypeDependent() || VK[I].Key->isValueDependent() || 3717 VK[I].Value->isTypeDependent() || VK[I].Value->isValueDependent()) 3718 ExprBits.ValueDependent = true; 3719 if (VK[I].Key->isInstantiationDependent() || 3720 VK[I].Value->isInstantiationDependent()) 3721 ExprBits.InstantiationDependent = true; 3722 if (VK[I].EllipsisLoc.isInvalid() && 3723 (VK[I].Key->containsUnexpandedParameterPack() || 3724 VK[I].Value->containsUnexpandedParameterPack())) 3725 ExprBits.ContainsUnexpandedParameterPack = true; 3726 3727 KeyValues[I].Key = VK[I].Key; 3728 KeyValues[I].Value = VK[I].Value; 3729 if (Expansions) { 3730 Expansions[I].EllipsisLoc = VK[I].EllipsisLoc; 3731 if (VK[I].NumExpansions) 3732 Expansions[I].NumExpansionsPlusOne = *VK[I].NumExpansions + 1; 3733 else 3734 Expansions[I].NumExpansionsPlusOne = 0; 3735 } 3736 } 3737} 3738 3739ObjCDictionaryLiteral * 3740ObjCDictionaryLiteral::Create(ASTContext &C, 3741 ArrayRef<ObjCDictionaryElement> VK, 3742 bool HasPackExpansions, 3743 QualType T, ObjCMethodDecl *method, 3744 SourceRange SR) { 3745 unsigned ExpansionsSize = 0; 3746 if (HasPackExpansions) 3747 ExpansionsSize = sizeof(ExpansionData) * VK.size(); 3748 3749 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3750 sizeof(KeyValuePair) * VK.size() + ExpansionsSize); 3751 return new (Mem) ObjCDictionaryLiteral(VK, HasPackExpansions, T, method, SR); 3752} 3753 3754ObjCDictionaryLiteral * 3755ObjCDictionaryLiteral::CreateEmpty(ASTContext &C, unsigned NumElements, 3756 bool HasPackExpansions) { 3757 unsigned ExpansionsSize = 0; 3758 if (HasPackExpansions) 3759 ExpansionsSize = sizeof(ExpansionData) * NumElements; 3760 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3761 sizeof(KeyValuePair) * NumElements + ExpansionsSize); 3762 return new (Mem) ObjCDictionaryLiteral(EmptyShell(), NumElements, 3763 HasPackExpansions); 3764} 3765 3766ObjCSubscriptRefExpr *ObjCSubscriptRefExpr::Create(ASTContext &C, 3767 Expr *base, 3768 Expr *key, QualType T, 3769 ObjCMethodDecl *getMethod, 3770 ObjCMethodDecl *setMethod, 3771 SourceLocation RB) { 3772 void *Mem = C.Allocate(sizeof(ObjCSubscriptRefExpr)); 3773 return new (Mem) ObjCSubscriptRefExpr(base, key, T, VK_LValue, 3774 OK_ObjCSubscript, 3775 getMethod, setMethod, RB); 3776} 3777 3778AtomicExpr::AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, 3779 QualType t, AtomicOp op, SourceLocation RP) 3780 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 3781 false, false, false, false), 3782 NumSubExprs(nexpr), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) 3783{ 3784 for (unsigned i = 0; i < nexpr; i++) { 3785 if (args[i]->isTypeDependent()) 3786 ExprBits.TypeDependent = true; 3787 if (args[i]->isValueDependent()) 3788 ExprBits.ValueDependent = true; 3789 if (args[i]->isInstantiationDependent()) 3790 ExprBits.InstantiationDependent = true; 3791 if (args[i]->containsUnexpandedParameterPack()) 3792 ExprBits.ContainsUnexpandedParameterPack = true; 3793 3794 SubExprs[i] = args[i]; 3795 } 3796} 3797