Expr.cpp revision e1b2abc2ed3f2c98985b06b4ad01c977bd584020
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 std::string Proto = FD->getQualifiedNameAsString(Policy); 403 llvm::raw_string_ostream POut(Proto); 404 405 const FunctionDecl *Decl = FD; 406 if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern()) 407 Decl = Pattern; 408 const FunctionType *AFT = Decl->getType()->getAs<FunctionType>(); 409 const FunctionProtoType *FT = 0; 410 if (FD->hasWrittenPrototype()) 411 FT = dyn_cast<FunctionProtoType>(AFT); 412 413 POut << "("; 414 if (FT) { 415 for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) { 416 if (i) POut << ", "; 417 std::string Param; 418 Decl->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 419 POut << Param; 420 } 421 422 if (FT->isVariadic()) { 423 if (FD->getNumParams()) POut << ", "; 424 POut << "..."; 425 } 426 } 427 POut << ")"; 428 429 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 430 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 431 if (ThisQuals.hasConst()) 432 POut << " const"; 433 if (ThisQuals.hasVolatile()) 434 POut << " volatile"; 435 RefQualifierKind Ref = MD->getRefQualifier(); 436 if (Ref == RQ_LValue) 437 POut << " &"; 438 else if (Ref == RQ_RValue) 439 POut << " &&"; 440 } 441 442 typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy; 443 SpecsTy Specs; 444 const DeclContext *Ctx = FD->getDeclContext(); 445 while (Ctx && isa<NamedDecl>(Ctx)) { 446 const ClassTemplateSpecializationDecl *Spec 447 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx); 448 if (Spec && !Spec->isExplicitSpecialization()) 449 Specs.push_back(Spec); 450 Ctx = Ctx->getParent(); 451 } 452 453 std::string TemplateParams; 454 llvm::raw_string_ostream TOut(TemplateParams); 455 for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend(); 456 I != E; ++I) { 457 const TemplateParameterList *Params 458 = (*I)->getSpecializedTemplate()->getTemplateParameters(); 459 const TemplateArgumentList &Args = (*I)->getTemplateArgs(); 460 assert(Params->size() == Args.size()); 461 for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) { 462 StringRef Param = Params->getParam(i)->getName(); 463 if (Param.empty()) continue; 464 TOut << Param << " = "; 465 Args.get(i).print(Policy, TOut); 466 TOut << ", "; 467 } 468 } 469 470 FunctionTemplateSpecializationInfo *FSI 471 = FD->getTemplateSpecializationInfo(); 472 if (FSI && !FSI->isExplicitSpecialization()) { 473 const TemplateParameterList* Params 474 = FSI->getTemplate()->getTemplateParameters(); 475 const TemplateArgumentList* Args = FSI->TemplateArguments; 476 assert(Params->size() == Args->size()); 477 for (unsigned i = 0, e = Params->size(); i != e; ++i) { 478 StringRef Param = Params->getParam(i)->getName(); 479 if (Param.empty()) continue; 480 TOut << Param << " = "; 481 Args->get(i).print(Policy, TOut); 482 TOut << ", "; 483 } 484 } 485 486 TOut.flush(); 487 if (!TemplateParams.empty()) { 488 // remove the trailing comma and space 489 TemplateParams.resize(TemplateParams.size() - 2); 490 POut << " [" << TemplateParams << "]"; 491 } 492 493 POut.flush(); 494 495 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 496 AFT->getResultType().getAsStringInternal(Proto, Policy); 497 498 Out << Proto; 499 500 Out.flush(); 501 return Name.str().str(); 502 } 503 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 504 SmallString<256> Name; 505 llvm::raw_svector_ostream Out(Name); 506 Out << (MD->isInstanceMethod() ? '-' : '+'); 507 Out << '['; 508 509 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 510 // a null check to avoid a crash. 511 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 512 Out << *ID; 513 514 if (const ObjCCategoryImplDecl *CID = 515 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 516 Out << '(' << *CID << ')'; 517 518 Out << ' '; 519 Out << MD->getSelector().getAsString(); 520 Out << ']'; 521 522 Out.flush(); 523 return Name.str().str(); 524 } 525 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 526 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 527 return "top level"; 528 } 529 return ""; 530} 531 532void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 533 if (hasAllocation()) 534 C.Deallocate(pVal); 535 536 BitWidth = Val.getBitWidth(); 537 unsigned NumWords = Val.getNumWords(); 538 const uint64_t* Words = Val.getRawData(); 539 if (NumWords > 1) { 540 pVal = new (C) uint64_t[NumWords]; 541 std::copy(Words, Words + NumWords, pVal); 542 } else if (NumWords == 1) 543 VAL = Words[0]; 544 else 545 VAL = 0; 546} 547 548IntegerLiteral * 549IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 550 QualType type, SourceLocation l) { 551 return new (C) IntegerLiteral(C, V, type, l); 552} 553 554IntegerLiteral * 555IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 556 return new (C) IntegerLiteral(Empty); 557} 558 559FloatingLiteral * 560FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 561 bool isexact, QualType Type, SourceLocation L) { 562 return new (C) FloatingLiteral(C, V, isexact, Type, L); 563} 564 565FloatingLiteral * 566FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 567 return new (C) FloatingLiteral(C, Empty); 568} 569 570/// getValueAsApproximateDouble - This returns the value as an inaccurate 571/// double. Note that this may cause loss of precision, but is useful for 572/// debugging dumps, etc. 573double FloatingLiteral::getValueAsApproximateDouble() const { 574 llvm::APFloat V = getValue(); 575 bool ignored; 576 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 577 &ignored); 578 return V.convertToDouble(); 579} 580 581int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) { 582 int CharByteWidth = 0; 583 switch(k) { 584 case Ascii: 585 case UTF8: 586 CharByteWidth = target.getCharWidth(); 587 break; 588 case Wide: 589 CharByteWidth = target.getWCharWidth(); 590 break; 591 case UTF16: 592 CharByteWidth = target.getChar16Width(); 593 break; 594 case UTF32: 595 CharByteWidth = target.getChar32Width(); 596 break; 597 } 598 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 599 CharByteWidth /= 8; 600 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 601 && "character byte widths supported are 1, 2, and 4 only"); 602 return CharByteWidth; 603} 604 605StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str, 606 StringKind Kind, bool Pascal, QualType Ty, 607 const SourceLocation *Loc, 608 unsigned NumStrs) { 609 // Allocate enough space for the StringLiteral plus an array of locations for 610 // any concatenated string tokens. 611 void *Mem = C.Allocate(sizeof(StringLiteral)+ 612 sizeof(SourceLocation)*(NumStrs-1), 613 llvm::alignOf<StringLiteral>()); 614 StringLiteral *SL = new (Mem) StringLiteral(Ty); 615 616 // OPTIMIZE: could allocate this appended to the StringLiteral. 617 SL->setString(C,Str,Kind,Pascal); 618 619 SL->TokLocs[0] = Loc[0]; 620 SL->NumConcatenated = NumStrs; 621 622 if (NumStrs != 1) 623 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 624 return SL; 625} 626 627StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 628 void *Mem = C.Allocate(sizeof(StringLiteral)+ 629 sizeof(SourceLocation)*(NumStrs-1), 630 llvm::alignOf<StringLiteral>()); 631 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 632 SL->CharByteWidth = 0; 633 SL->Length = 0; 634 SL->NumConcatenated = NumStrs; 635 return SL; 636} 637 638void StringLiteral::setString(ASTContext &C, StringRef Str, 639 StringKind Kind, bool IsPascal) { 640 //FIXME: we assume that the string data comes from a target that uses the same 641 // code unit size and endianess for the type of string. 642 this->Kind = Kind; 643 this->IsPascal = IsPascal; 644 645 CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind); 646 assert((Str.size()%CharByteWidth == 0) 647 && "size of data must be multiple of CharByteWidth"); 648 Length = Str.size()/CharByteWidth; 649 650 switch(CharByteWidth) { 651 case 1: { 652 char *AStrData = new (C) char[Length]; 653 std::memcpy(AStrData,Str.data(),Str.size()); 654 StrData.asChar = AStrData; 655 break; 656 } 657 case 2: { 658 uint16_t *AStrData = new (C) uint16_t[Length]; 659 std::memcpy(AStrData,Str.data(),Str.size()); 660 StrData.asUInt16 = AStrData; 661 break; 662 } 663 case 4: { 664 uint32_t *AStrData = new (C) uint32_t[Length]; 665 std::memcpy(AStrData,Str.data(),Str.size()); 666 StrData.asUInt32 = AStrData; 667 break; 668 } 669 default: 670 assert(false && "unsupported CharByteWidth"); 671 } 672} 673 674/// getLocationOfByte - Return a source location that points to the specified 675/// byte of this string literal. 676/// 677/// Strings are amazingly complex. They can be formed from multiple tokens and 678/// can have escape sequences in them in addition to the usual trigraph and 679/// escaped newline business. This routine handles this complexity. 680/// 681SourceLocation StringLiteral:: 682getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 683 const LangOptions &Features, const TargetInfo &Target) const { 684 assert(Kind == StringLiteral::Ascii && "This only works for ASCII strings"); 685 686 // Loop over all of the tokens in this string until we find the one that 687 // contains the byte we're looking for. 688 unsigned TokNo = 0; 689 while (1) { 690 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 691 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 692 693 // Get the spelling of the string so that we can get the data that makes up 694 // the string literal, not the identifier for the macro it is potentially 695 // expanded through. 696 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 697 698 // Re-lex the token to get its length and original spelling. 699 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 700 bool Invalid = false; 701 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 702 if (Invalid) 703 return StrTokSpellingLoc; 704 705 const char *StrData = Buffer.data()+LocInfo.second; 706 707 // Create a langops struct and enable trigraphs. This is sufficient for 708 // relexing tokens. 709 LangOptions LangOpts; 710 LangOpts.Trigraphs = true; 711 712 // Create a lexer starting at the beginning of this token. 713 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 714 Buffer.end()); 715 Token TheTok; 716 TheLexer.LexFromRawLexer(TheTok); 717 718 // Use the StringLiteralParser to compute the length of the string in bytes. 719 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 720 unsigned TokNumBytes = SLP.GetStringLength(); 721 722 // If the byte is in this token, return the location of the byte. 723 if (ByteNo < TokNumBytes || 724 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) { 725 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 726 727 // Now that we know the offset of the token in the spelling, use the 728 // preprocessor to get the offset in the original source. 729 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 730 } 731 732 // Move to the next string token. 733 ++TokNo; 734 ByteNo -= TokNumBytes; 735 } 736} 737 738 739 740/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 741/// corresponds to, e.g. "sizeof" or "[pre]++". 742const char *UnaryOperator::getOpcodeStr(Opcode Op) { 743 switch (Op) { 744 case UO_PostInc: return "++"; 745 case UO_PostDec: return "--"; 746 case UO_PreInc: return "++"; 747 case UO_PreDec: return "--"; 748 case UO_AddrOf: return "&"; 749 case UO_Deref: return "*"; 750 case UO_Plus: return "+"; 751 case UO_Minus: return "-"; 752 case UO_Not: return "~"; 753 case UO_LNot: return "!"; 754 case UO_Real: return "__real"; 755 case UO_Imag: return "__imag"; 756 case UO_Extension: return "__extension__"; 757 } 758 llvm_unreachable("Unknown unary operator"); 759} 760 761UnaryOperatorKind 762UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 763 switch (OO) { 764 default: llvm_unreachable("No unary operator for overloaded function"); 765 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 766 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 767 case OO_Amp: return UO_AddrOf; 768 case OO_Star: return UO_Deref; 769 case OO_Plus: return UO_Plus; 770 case OO_Minus: return UO_Minus; 771 case OO_Tilde: return UO_Not; 772 case OO_Exclaim: return UO_LNot; 773 } 774} 775 776OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 777 switch (Opc) { 778 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 779 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 780 case UO_AddrOf: return OO_Amp; 781 case UO_Deref: return OO_Star; 782 case UO_Plus: return OO_Plus; 783 case UO_Minus: return OO_Minus; 784 case UO_Not: return OO_Tilde; 785 case UO_LNot: return OO_Exclaim; 786 default: return OO_None; 787 } 788} 789 790 791//===----------------------------------------------------------------------===// 792// Postfix Operators. 793//===----------------------------------------------------------------------===// 794 795CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 796 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 797 SourceLocation rparenloc) 798 : Expr(SC, t, VK, OK_Ordinary, 799 fn->isTypeDependent(), 800 fn->isValueDependent(), 801 fn->isInstantiationDependent(), 802 fn->containsUnexpandedParameterPack()), 803 NumArgs(numargs) { 804 805 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 806 SubExprs[FN] = fn; 807 for (unsigned i = 0; i != numargs; ++i) { 808 if (args[i]->isTypeDependent()) 809 ExprBits.TypeDependent = true; 810 if (args[i]->isValueDependent()) 811 ExprBits.ValueDependent = true; 812 if (args[i]->isInstantiationDependent()) 813 ExprBits.InstantiationDependent = true; 814 if (args[i]->containsUnexpandedParameterPack()) 815 ExprBits.ContainsUnexpandedParameterPack = true; 816 817 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 818 } 819 820 CallExprBits.NumPreArgs = NumPreArgs; 821 RParenLoc = rparenloc; 822} 823 824CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 825 QualType t, ExprValueKind VK, SourceLocation rparenloc) 826 : Expr(CallExprClass, t, VK, OK_Ordinary, 827 fn->isTypeDependent(), 828 fn->isValueDependent(), 829 fn->isInstantiationDependent(), 830 fn->containsUnexpandedParameterPack()), 831 NumArgs(numargs) { 832 833 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 834 SubExprs[FN] = fn; 835 for (unsigned i = 0; i != numargs; ++i) { 836 if (args[i]->isTypeDependent()) 837 ExprBits.TypeDependent = true; 838 if (args[i]->isValueDependent()) 839 ExprBits.ValueDependent = true; 840 if (args[i]->isInstantiationDependent()) 841 ExprBits.InstantiationDependent = true; 842 if (args[i]->containsUnexpandedParameterPack()) 843 ExprBits.ContainsUnexpandedParameterPack = true; 844 845 SubExprs[i+PREARGS_START] = args[i]; 846 } 847 848 CallExprBits.NumPreArgs = 0; 849 RParenLoc = rparenloc; 850} 851 852CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 853 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 854 // FIXME: Why do we allocate this? 855 SubExprs = new (C) Stmt*[PREARGS_START]; 856 CallExprBits.NumPreArgs = 0; 857} 858 859CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 860 EmptyShell Empty) 861 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 862 // FIXME: Why do we allocate this? 863 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 864 CallExprBits.NumPreArgs = NumPreArgs; 865} 866 867Decl *CallExpr::getCalleeDecl() { 868 Expr *CEE = getCallee()->IgnoreParenImpCasts(); 869 870 while (SubstNonTypeTemplateParmExpr *NTTP 871 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) { 872 CEE = NTTP->getReplacement()->IgnoreParenCasts(); 873 } 874 875 // If we're calling a dereference, look at the pointer instead. 876 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 877 if (BO->isPtrMemOp()) 878 CEE = BO->getRHS()->IgnoreParenCasts(); 879 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 880 if (UO->getOpcode() == UO_Deref) 881 CEE = UO->getSubExpr()->IgnoreParenCasts(); 882 } 883 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 884 return DRE->getDecl(); 885 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 886 return ME->getMemberDecl(); 887 888 return 0; 889} 890 891FunctionDecl *CallExpr::getDirectCallee() { 892 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 893} 894 895/// setNumArgs - This changes the number of arguments present in this call. 896/// Any orphaned expressions are deleted by this, and any new operands are set 897/// to null. 898void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 899 // No change, just return. 900 if (NumArgs == getNumArgs()) return; 901 902 // If shrinking # arguments, just delete the extras and forgot them. 903 if (NumArgs < getNumArgs()) { 904 this->NumArgs = NumArgs; 905 return; 906 } 907 908 // Otherwise, we are growing the # arguments. New an bigger argument array. 909 unsigned NumPreArgs = getNumPreArgs(); 910 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 911 // Copy over args. 912 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 913 NewSubExprs[i] = SubExprs[i]; 914 // Null out new args. 915 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 916 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 917 NewSubExprs[i] = 0; 918 919 if (SubExprs) C.Deallocate(SubExprs); 920 SubExprs = NewSubExprs; 921 this->NumArgs = NumArgs; 922} 923 924/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 925/// not, return 0. 926unsigned CallExpr::isBuiltinCall() const { 927 // All simple function calls (e.g. func()) are implicitly cast to pointer to 928 // function. As a result, we try and obtain the DeclRefExpr from the 929 // ImplicitCastExpr. 930 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 931 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 932 return 0; 933 934 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 935 if (!DRE) 936 return 0; 937 938 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 939 if (!FDecl) 940 return 0; 941 942 if (!FDecl->getIdentifier()) 943 return 0; 944 945 return FDecl->getBuiltinID(); 946} 947 948QualType CallExpr::getCallReturnType() const { 949 QualType CalleeType = getCallee()->getType(); 950 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 951 CalleeType = FnTypePtr->getPointeeType(); 952 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 953 CalleeType = BPT->getPointeeType(); 954 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) 955 // This should never be overloaded and so should never return null. 956 CalleeType = Expr::findBoundMemberType(getCallee()); 957 958 const FunctionType *FnType = CalleeType->castAs<FunctionType>(); 959 return FnType->getResultType(); 960} 961 962SourceRange CallExpr::getSourceRange() const { 963 if (isa<CXXOperatorCallExpr>(this)) 964 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 965 966 SourceLocation begin = getCallee()->getLocStart(); 967 if (begin.isInvalid() && getNumArgs() > 0) 968 begin = getArg(0)->getLocStart(); 969 SourceLocation end = getRParenLoc(); 970 if (end.isInvalid() && getNumArgs() > 0) 971 end = getArg(getNumArgs() - 1)->getLocEnd(); 972 return SourceRange(begin, end); 973} 974SourceLocation CallExpr::getLocStart() const { 975 if (isa<CXXOperatorCallExpr>(this)) 976 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getBegin(); 977 978 SourceLocation begin = getCallee()->getLocStart(); 979 if (begin.isInvalid() && getNumArgs() > 0) 980 begin = getArg(0)->getLocStart(); 981 return begin; 982} 983SourceLocation CallExpr::getLocEnd() const { 984 if (isa<CXXOperatorCallExpr>(this)) 985 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getEnd(); 986 987 SourceLocation end = getRParenLoc(); 988 if (end.isInvalid() && getNumArgs() > 0) 989 end = getArg(getNumArgs() - 1)->getLocEnd(); 990 return end; 991} 992 993OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 994 SourceLocation OperatorLoc, 995 TypeSourceInfo *tsi, 996 OffsetOfNode* compsPtr, unsigned numComps, 997 Expr** exprsPtr, unsigned numExprs, 998 SourceLocation RParenLoc) { 999 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 1000 sizeof(OffsetOfNode) * numComps + 1001 sizeof(Expr*) * numExprs); 1002 1003 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 1004 exprsPtr, numExprs, RParenLoc); 1005} 1006 1007OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 1008 unsigned numComps, unsigned numExprs) { 1009 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 1010 sizeof(OffsetOfNode) * numComps + 1011 sizeof(Expr*) * numExprs); 1012 return new (Mem) OffsetOfExpr(numComps, numExprs); 1013} 1014 1015OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 1016 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1017 OffsetOfNode* compsPtr, unsigned numComps, 1018 Expr** exprsPtr, unsigned numExprs, 1019 SourceLocation RParenLoc) 1020 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 1021 /*TypeDependent=*/false, 1022 /*ValueDependent=*/tsi->getType()->isDependentType(), 1023 tsi->getType()->isInstantiationDependentType(), 1024 tsi->getType()->containsUnexpandedParameterPack()), 1025 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 1026 NumComps(numComps), NumExprs(numExprs) 1027{ 1028 for(unsigned i = 0; i < numComps; ++i) { 1029 setComponent(i, compsPtr[i]); 1030 } 1031 1032 for(unsigned i = 0; i < numExprs; ++i) { 1033 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 1034 ExprBits.ValueDependent = true; 1035 if (exprsPtr[i]->containsUnexpandedParameterPack()) 1036 ExprBits.ContainsUnexpandedParameterPack = true; 1037 1038 setIndexExpr(i, exprsPtr[i]); 1039 } 1040} 1041 1042IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 1043 assert(getKind() == Field || getKind() == Identifier); 1044 if (getKind() == Field) 1045 return getField()->getIdentifier(); 1046 1047 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 1048} 1049 1050MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 1051 NestedNameSpecifierLoc QualifierLoc, 1052 SourceLocation TemplateKWLoc, 1053 ValueDecl *memberdecl, 1054 DeclAccessPair founddecl, 1055 DeclarationNameInfo nameinfo, 1056 const TemplateArgumentListInfo *targs, 1057 QualType ty, 1058 ExprValueKind vk, 1059 ExprObjectKind ok) { 1060 std::size_t Size = sizeof(MemberExpr); 1061 1062 bool hasQualOrFound = (QualifierLoc || 1063 founddecl.getDecl() != memberdecl || 1064 founddecl.getAccess() != memberdecl->getAccess()); 1065 if (hasQualOrFound) 1066 Size += sizeof(MemberNameQualifier); 1067 1068 if (targs) 1069 Size += ASTTemplateKWAndArgsInfo::sizeFor(targs->size()); 1070 else if (TemplateKWLoc.isValid()) 1071 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 1072 1073 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 1074 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 1075 ty, vk, ok); 1076 1077 if (hasQualOrFound) { 1078 // FIXME: Wrong. We should be looking at the member declaration we found. 1079 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 1080 E->setValueDependent(true); 1081 E->setTypeDependent(true); 1082 E->setInstantiationDependent(true); 1083 } 1084 else if (QualifierLoc && 1085 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) 1086 E->setInstantiationDependent(true); 1087 1088 E->HasQualifierOrFoundDecl = true; 1089 1090 MemberNameQualifier *NQ = E->getMemberQualifier(); 1091 NQ->QualifierLoc = QualifierLoc; 1092 NQ->FoundDecl = founddecl; 1093 } 1094 1095 E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid()); 1096 1097 if (targs) { 1098 bool Dependent = false; 1099 bool InstantiationDependent = false; 1100 bool ContainsUnexpandedParameterPack = false; 1101 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *targs, 1102 Dependent, 1103 InstantiationDependent, 1104 ContainsUnexpandedParameterPack); 1105 if (InstantiationDependent) 1106 E->setInstantiationDependent(true); 1107 } else if (TemplateKWLoc.isValid()) { 1108 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 1109 } 1110 1111 return E; 1112} 1113 1114SourceRange MemberExpr::getSourceRange() const { 1115 return SourceRange(getLocStart(), getLocEnd()); 1116} 1117SourceLocation MemberExpr::getLocStart() const { 1118 if (isImplicitAccess()) { 1119 if (hasQualifier()) 1120 return getQualifierLoc().getBeginLoc(); 1121 return MemberLoc; 1122 } 1123 1124 // FIXME: We don't want this to happen. Rather, we should be able to 1125 // detect all kinds of implicit accesses more cleanly. 1126 SourceLocation BaseStartLoc = getBase()->getLocStart(); 1127 if (BaseStartLoc.isValid()) 1128 return BaseStartLoc; 1129 return MemberLoc; 1130} 1131SourceLocation MemberExpr::getLocEnd() const { 1132 if (hasExplicitTemplateArgs()) 1133 return getRAngleLoc(); 1134 return getMemberNameInfo().getEndLoc(); 1135} 1136 1137void CastExpr::CheckCastConsistency() const { 1138 switch (getCastKind()) { 1139 case CK_DerivedToBase: 1140 case CK_UncheckedDerivedToBase: 1141 case CK_DerivedToBaseMemberPointer: 1142 case CK_BaseToDerived: 1143 case CK_BaseToDerivedMemberPointer: 1144 assert(!path_empty() && "Cast kind should have a base path!"); 1145 break; 1146 1147 case CK_CPointerToObjCPointerCast: 1148 assert(getType()->isObjCObjectPointerType()); 1149 assert(getSubExpr()->getType()->isPointerType()); 1150 goto CheckNoBasePath; 1151 1152 case CK_BlockPointerToObjCPointerCast: 1153 assert(getType()->isObjCObjectPointerType()); 1154 assert(getSubExpr()->getType()->isBlockPointerType()); 1155 goto CheckNoBasePath; 1156 1157 case CK_ReinterpretMemberPointer: 1158 assert(getType()->isMemberPointerType()); 1159 assert(getSubExpr()->getType()->isMemberPointerType()); 1160 goto CheckNoBasePath; 1161 1162 case CK_BitCast: 1163 // Arbitrary casts to C pointer types count as bitcasts. 1164 // Otherwise, we should only have block and ObjC pointer casts 1165 // here if they stay within the type kind. 1166 if (!getType()->isPointerType()) { 1167 assert(getType()->isObjCObjectPointerType() == 1168 getSubExpr()->getType()->isObjCObjectPointerType()); 1169 assert(getType()->isBlockPointerType() == 1170 getSubExpr()->getType()->isBlockPointerType()); 1171 } 1172 goto CheckNoBasePath; 1173 1174 case CK_AnyPointerToBlockPointerCast: 1175 assert(getType()->isBlockPointerType()); 1176 assert(getSubExpr()->getType()->isAnyPointerType() && 1177 !getSubExpr()->getType()->isBlockPointerType()); 1178 goto CheckNoBasePath; 1179 1180 case CK_CopyAndAutoreleaseBlockObject: 1181 assert(getType()->isBlockPointerType()); 1182 assert(getSubExpr()->getType()->isBlockPointerType()); 1183 goto CheckNoBasePath; 1184 1185 // These should not have an inheritance path. 1186 case CK_Dynamic: 1187 case CK_ToUnion: 1188 case CK_ArrayToPointerDecay: 1189 case CK_FunctionToPointerDecay: 1190 case CK_NullToMemberPointer: 1191 case CK_NullToPointer: 1192 case CK_ConstructorConversion: 1193 case CK_IntegralToPointer: 1194 case CK_PointerToIntegral: 1195 case CK_ToVoid: 1196 case CK_VectorSplat: 1197 case CK_IntegralCast: 1198 case CK_IntegralToFloating: 1199 case CK_FloatingToIntegral: 1200 case CK_FloatingCast: 1201 case CK_ObjCObjectLValueCast: 1202 case CK_FloatingRealToComplex: 1203 case CK_FloatingComplexToReal: 1204 case CK_FloatingComplexCast: 1205 case CK_FloatingComplexToIntegralComplex: 1206 case CK_IntegralRealToComplex: 1207 case CK_IntegralComplexToReal: 1208 case CK_IntegralComplexCast: 1209 case CK_IntegralComplexToFloatingComplex: 1210 case CK_ARCProduceObject: 1211 case CK_ARCConsumeObject: 1212 case CK_ARCReclaimReturnedObject: 1213 case CK_ARCExtendBlockObject: 1214 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 1215 goto CheckNoBasePath; 1216 1217 case CK_Dependent: 1218 case CK_LValueToRValue: 1219 case CK_NoOp: 1220 case CK_AtomicToNonAtomic: 1221 case CK_NonAtomicToAtomic: 1222 case CK_PointerToBoolean: 1223 case CK_IntegralToBoolean: 1224 case CK_FloatingToBoolean: 1225 case CK_MemberPointerToBoolean: 1226 case CK_FloatingComplexToBoolean: 1227 case CK_IntegralComplexToBoolean: 1228 case CK_LValueBitCast: // -> bool& 1229 case CK_UserDefinedConversion: // operator bool() 1230 CheckNoBasePath: 1231 assert(path_empty() && "Cast kind should not have a base path!"); 1232 break; 1233 } 1234} 1235 1236const char *CastExpr::getCastKindName() const { 1237 switch (getCastKind()) { 1238 case CK_Dependent: 1239 return "Dependent"; 1240 case CK_BitCast: 1241 return "BitCast"; 1242 case CK_LValueBitCast: 1243 return "LValueBitCast"; 1244 case CK_LValueToRValue: 1245 return "LValueToRValue"; 1246 case CK_NoOp: 1247 return "NoOp"; 1248 case CK_BaseToDerived: 1249 return "BaseToDerived"; 1250 case CK_DerivedToBase: 1251 return "DerivedToBase"; 1252 case CK_UncheckedDerivedToBase: 1253 return "UncheckedDerivedToBase"; 1254 case CK_Dynamic: 1255 return "Dynamic"; 1256 case CK_ToUnion: 1257 return "ToUnion"; 1258 case CK_ArrayToPointerDecay: 1259 return "ArrayToPointerDecay"; 1260 case CK_FunctionToPointerDecay: 1261 return "FunctionToPointerDecay"; 1262 case CK_NullToMemberPointer: 1263 return "NullToMemberPointer"; 1264 case CK_NullToPointer: 1265 return "NullToPointer"; 1266 case CK_BaseToDerivedMemberPointer: 1267 return "BaseToDerivedMemberPointer"; 1268 case CK_DerivedToBaseMemberPointer: 1269 return "DerivedToBaseMemberPointer"; 1270 case CK_ReinterpretMemberPointer: 1271 return "ReinterpretMemberPointer"; 1272 case CK_UserDefinedConversion: 1273 return "UserDefinedConversion"; 1274 case CK_ConstructorConversion: 1275 return "ConstructorConversion"; 1276 case CK_IntegralToPointer: 1277 return "IntegralToPointer"; 1278 case CK_PointerToIntegral: 1279 return "PointerToIntegral"; 1280 case CK_PointerToBoolean: 1281 return "PointerToBoolean"; 1282 case CK_ToVoid: 1283 return "ToVoid"; 1284 case CK_VectorSplat: 1285 return "VectorSplat"; 1286 case CK_IntegralCast: 1287 return "IntegralCast"; 1288 case CK_IntegralToBoolean: 1289 return "IntegralToBoolean"; 1290 case CK_IntegralToFloating: 1291 return "IntegralToFloating"; 1292 case CK_FloatingToIntegral: 1293 return "FloatingToIntegral"; 1294 case CK_FloatingCast: 1295 return "FloatingCast"; 1296 case CK_FloatingToBoolean: 1297 return "FloatingToBoolean"; 1298 case CK_MemberPointerToBoolean: 1299 return "MemberPointerToBoolean"; 1300 case CK_CPointerToObjCPointerCast: 1301 return "CPointerToObjCPointerCast"; 1302 case CK_BlockPointerToObjCPointerCast: 1303 return "BlockPointerToObjCPointerCast"; 1304 case CK_AnyPointerToBlockPointerCast: 1305 return "AnyPointerToBlockPointerCast"; 1306 case CK_ObjCObjectLValueCast: 1307 return "ObjCObjectLValueCast"; 1308 case CK_FloatingRealToComplex: 1309 return "FloatingRealToComplex"; 1310 case CK_FloatingComplexToReal: 1311 return "FloatingComplexToReal"; 1312 case CK_FloatingComplexToBoolean: 1313 return "FloatingComplexToBoolean"; 1314 case CK_FloatingComplexCast: 1315 return "FloatingComplexCast"; 1316 case CK_FloatingComplexToIntegralComplex: 1317 return "FloatingComplexToIntegralComplex"; 1318 case CK_IntegralRealToComplex: 1319 return "IntegralRealToComplex"; 1320 case CK_IntegralComplexToReal: 1321 return "IntegralComplexToReal"; 1322 case CK_IntegralComplexToBoolean: 1323 return "IntegralComplexToBoolean"; 1324 case CK_IntegralComplexCast: 1325 return "IntegralComplexCast"; 1326 case CK_IntegralComplexToFloatingComplex: 1327 return "IntegralComplexToFloatingComplex"; 1328 case CK_ARCConsumeObject: 1329 return "ARCConsumeObject"; 1330 case CK_ARCProduceObject: 1331 return "ARCProduceObject"; 1332 case CK_ARCReclaimReturnedObject: 1333 return "ARCReclaimReturnedObject"; 1334 case CK_ARCExtendBlockObject: 1335 return "ARCCExtendBlockObject"; 1336 case CK_AtomicToNonAtomic: 1337 return "AtomicToNonAtomic"; 1338 case CK_NonAtomicToAtomic: 1339 return "NonAtomicToAtomic"; 1340 case CK_CopyAndAutoreleaseBlockObject: 1341 return "CopyAndAutoreleaseBlockObject"; 1342 } 1343 1344 llvm_unreachable("Unhandled cast kind!"); 1345} 1346 1347Expr *CastExpr::getSubExprAsWritten() { 1348 Expr *SubExpr = 0; 1349 CastExpr *E = this; 1350 do { 1351 SubExpr = E->getSubExpr(); 1352 1353 // Skip through reference binding to temporary. 1354 if (MaterializeTemporaryExpr *Materialize 1355 = dyn_cast<MaterializeTemporaryExpr>(SubExpr)) 1356 SubExpr = Materialize->GetTemporaryExpr(); 1357 1358 // Skip any temporary bindings; they're implicit. 1359 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1360 SubExpr = Binder->getSubExpr(); 1361 1362 // Conversions by constructor and conversion functions have a 1363 // subexpression describing the call; strip it off. 1364 if (E->getCastKind() == CK_ConstructorConversion) 1365 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1366 else if (E->getCastKind() == CK_UserDefinedConversion) 1367 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1368 1369 // If the subexpression we're left with is an implicit cast, look 1370 // through that, too. 1371 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1372 1373 return SubExpr; 1374} 1375 1376CXXBaseSpecifier **CastExpr::path_buffer() { 1377 switch (getStmtClass()) { 1378#define ABSTRACT_STMT(x) 1379#define CASTEXPR(Type, Base) \ 1380 case Stmt::Type##Class: \ 1381 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1382#define STMT(Type, Base) 1383#include "clang/AST/StmtNodes.inc" 1384 default: 1385 llvm_unreachable("non-cast expressions not possible here"); 1386 } 1387} 1388 1389void CastExpr::setCastPath(const CXXCastPath &Path) { 1390 assert(Path.size() == path_size()); 1391 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1392} 1393 1394ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1395 CastKind Kind, Expr *Operand, 1396 const CXXCastPath *BasePath, 1397 ExprValueKind VK) { 1398 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1399 void *Buffer = 1400 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1401 ImplicitCastExpr *E = 1402 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1403 if (PathSize) E->setCastPath(*BasePath); 1404 return E; 1405} 1406 1407ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1408 unsigned PathSize) { 1409 void *Buffer = 1410 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1411 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1412} 1413 1414 1415CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1416 ExprValueKind VK, CastKind K, Expr *Op, 1417 const CXXCastPath *BasePath, 1418 TypeSourceInfo *WrittenTy, 1419 SourceLocation L, SourceLocation R) { 1420 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1421 void *Buffer = 1422 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1423 CStyleCastExpr *E = 1424 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1425 if (PathSize) E->setCastPath(*BasePath); 1426 return E; 1427} 1428 1429CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1430 void *Buffer = 1431 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1432 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1433} 1434 1435/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1436/// corresponds to, e.g. "<<=". 1437const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1438 switch (Op) { 1439 case BO_PtrMemD: return ".*"; 1440 case BO_PtrMemI: return "->*"; 1441 case BO_Mul: return "*"; 1442 case BO_Div: return "/"; 1443 case BO_Rem: return "%"; 1444 case BO_Add: return "+"; 1445 case BO_Sub: return "-"; 1446 case BO_Shl: return "<<"; 1447 case BO_Shr: return ">>"; 1448 case BO_LT: return "<"; 1449 case BO_GT: return ">"; 1450 case BO_LE: return "<="; 1451 case BO_GE: return ">="; 1452 case BO_EQ: return "=="; 1453 case BO_NE: return "!="; 1454 case BO_And: return "&"; 1455 case BO_Xor: return "^"; 1456 case BO_Or: return "|"; 1457 case BO_LAnd: return "&&"; 1458 case BO_LOr: return "||"; 1459 case BO_Assign: return "="; 1460 case BO_MulAssign: return "*="; 1461 case BO_DivAssign: return "/="; 1462 case BO_RemAssign: return "%="; 1463 case BO_AddAssign: return "+="; 1464 case BO_SubAssign: return "-="; 1465 case BO_ShlAssign: return "<<="; 1466 case BO_ShrAssign: return ">>="; 1467 case BO_AndAssign: return "&="; 1468 case BO_XorAssign: return "^="; 1469 case BO_OrAssign: return "|="; 1470 case BO_Comma: return ","; 1471 } 1472 1473 llvm_unreachable("Invalid OpCode!"); 1474} 1475 1476BinaryOperatorKind 1477BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1478 switch (OO) { 1479 default: llvm_unreachable("Not an overloadable binary operator"); 1480 case OO_Plus: return BO_Add; 1481 case OO_Minus: return BO_Sub; 1482 case OO_Star: return BO_Mul; 1483 case OO_Slash: return BO_Div; 1484 case OO_Percent: return BO_Rem; 1485 case OO_Caret: return BO_Xor; 1486 case OO_Amp: return BO_And; 1487 case OO_Pipe: return BO_Or; 1488 case OO_Equal: return BO_Assign; 1489 case OO_Less: return BO_LT; 1490 case OO_Greater: return BO_GT; 1491 case OO_PlusEqual: return BO_AddAssign; 1492 case OO_MinusEqual: return BO_SubAssign; 1493 case OO_StarEqual: return BO_MulAssign; 1494 case OO_SlashEqual: return BO_DivAssign; 1495 case OO_PercentEqual: return BO_RemAssign; 1496 case OO_CaretEqual: return BO_XorAssign; 1497 case OO_AmpEqual: return BO_AndAssign; 1498 case OO_PipeEqual: return BO_OrAssign; 1499 case OO_LessLess: return BO_Shl; 1500 case OO_GreaterGreater: return BO_Shr; 1501 case OO_LessLessEqual: return BO_ShlAssign; 1502 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1503 case OO_EqualEqual: return BO_EQ; 1504 case OO_ExclaimEqual: return BO_NE; 1505 case OO_LessEqual: return BO_LE; 1506 case OO_GreaterEqual: return BO_GE; 1507 case OO_AmpAmp: return BO_LAnd; 1508 case OO_PipePipe: return BO_LOr; 1509 case OO_Comma: return BO_Comma; 1510 case OO_ArrowStar: return BO_PtrMemI; 1511 } 1512} 1513 1514OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1515 static const OverloadedOperatorKind OverOps[] = { 1516 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1517 OO_Star, OO_Slash, OO_Percent, 1518 OO_Plus, OO_Minus, 1519 OO_LessLess, OO_GreaterGreater, 1520 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1521 OO_EqualEqual, OO_ExclaimEqual, 1522 OO_Amp, 1523 OO_Caret, 1524 OO_Pipe, 1525 OO_AmpAmp, 1526 OO_PipePipe, 1527 OO_Equal, OO_StarEqual, 1528 OO_SlashEqual, OO_PercentEqual, 1529 OO_PlusEqual, OO_MinusEqual, 1530 OO_LessLessEqual, OO_GreaterGreaterEqual, 1531 OO_AmpEqual, OO_CaretEqual, 1532 OO_PipeEqual, 1533 OO_Comma 1534 }; 1535 return OverOps[Opc]; 1536} 1537 1538InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1539 Expr **initExprs, unsigned numInits, 1540 SourceLocation rbraceloc) 1541 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1542 false, false), 1543 InitExprs(C, numInits), 1544 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0) 1545{ 1546 sawArrayRangeDesignator(false); 1547 setInitializesStdInitializerList(false); 1548 for (unsigned I = 0; I != numInits; ++I) { 1549 if (initExprs[I]->isTypeDependent()) 1550 ExprBits.TypeDependent = true; 1551 if (initExprs[I]->isValueDependent()) 1552 ExprBits.ValueDependent = true; 1553 if (initExprs[I]->isInstantiationDependent()) 1554 ExprBits.InstantiationDependent = true; 1555 if (initExprs[I]->containsUnexpandedParameterPack()) 1556 ExprBits.ContainsUnexpandedParameterPack = true; 1557 } 1558 1559 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1560} 1561 1562void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1563 if (NumInits > InitExprs.size()) 1564 InitExprs.reserve(C, NumInits); 1565} 1566 1567void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1568 InitExprs.resize(C, NumInits, 0); 1569} 1570 1571Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1572 if (Init >= InitExprs.size()) { 1573 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1574 InitExprs.back() = expr; 1575 return 0; 1576 } 1577 1578 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1579 InitExprs[Init] = expr; 1580 return Result; 1581} 1582 1583void InitListExpr::setArrayFiller(Expr *filler) { 1584 assert(!hasArrayFiller() && "Filler already set!"); 1585 ArrayFillerOrUnionFieldInit = filler; 1586 // Fill out any "holes" in the array due to designated initializers. 1587 Expr **inits = getInits(); 1588 for (unsigned i = 0, e = getNumInits(); i != e; ++i) 1589 if (inits[i] == 0) 1590 inits[i] = filler; 1591} 1592 1593SourceRange InitListExpr::getSourceRange() const { 1594 if (SyntacticForm) 1595 return SyntacticForm->getSourceRange(); 1596 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1597 if (Beg.isInvalid()) { 1598 // Find the first non-null initializer. 1599 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1600 E = InitExprs.end(); 1601 I != E; ++I) { 1602 if (Stmt *S = *I) { 1603 Beg = S->getLocStart(); 1604 break; 1605 } 1606 } 1607 } 1608 if (End.isInvalid()) { 1609 // Find the first non-null initializer from the end. 1610 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1611 E = InitExprs.rend(); 1612 I != E; ++I) { 1613 if (Stmt *S = *I) { 1614 End = S->getSourceRange().getEnd(); 1615 break; 1616 } 1617 } 1618 } 1619 return SourceRange(Beg, End); 1620} 1621 1622/// getFunctionType - Return the underlying function type for this block. 1623/// 1624const FunctionProtoType *BlockExpr::getFunctionType() const { 1625 // The block pointer is never sugared, but the function type might be. 1626 return cast<BlockPointerType>(getType()) 1627 ->getPointeeType()->castAs<FunctionProtoType>(); 1628} 1629 1630SourceLocation BlockExpr::getCaretLocation() const { 1631 return TheBlock->getCaretLocation(); 1632} 1633const Stmt *BlockExpr::getBody() const { 1634 return TheBlock->getBody(); 1635} 1636Stmt *BlockExpr::getBody() { 1637 return TheBlock->getBody(); 1638} 1639 1640 1641//===----------------------------------------------------------------------===// 1642// Generic Expression Routines 1643//===----------------------------------------------------------------------===// 1644 1645/// isUnusedResultAWarning - Return true if this immediate expression should 1646/// be warned about if the result is unused. If so, fill in Loc and Ranges 1647/// with location to warn on and the source range[s] to report with the 1648/// warning. 1649bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1650 SourceRange &R2, ASTContext &Ctx) const { 1651 // Don't warn if the expr is type dependent. The type could end up 1652 // instantiating to void. 1653 if (isTypeDependent()) 1654 return false; 1655 1656 switch (getStmtClass()) { 1657 default: 1658 if (getType()->isVoidType()) 1659 return false; 1660 Loc = getExprLoc(); 1661 R1 = getSourceRange(); 1662 return true; 1663 case ParenExprClass: 1664 return cast<ParenExpr>(this)->getSubExpr()-> 1665 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1666 case GenericSelectionExprClass: 1667 return cast<GenericSelectionExpr>(this)->getResultExpr()-> 1668 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1669 case UnaryOperatorClass: { 1670 const UnaryOperator *UO = cast<UnaryOperator>(this); 1671 1672 switch (UO->getOpcode()) { 1673 default: break; 1674 case UO_PostInc: 1675 case UO_PostDec: 1676 case UO_PreInc: 1677 case UO_PreDec: // ++/-- 1678 return false; // Not a warning. 1679 case UO_Deref: 1680 // Dereferencing a volatile pointer is a side-effect. 1681 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1682 return false; 1683 break; 1684 case UO_Real: 1685 case UO_Imag: 1686 // accessing a piece of a volatile complex is a side-effect. 1687 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1688 .isVolatileQualified()) 1689 return false; 1690 break; 1691 case UO_Extension: 1692 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1693 } 1694 Loc = UO->getOperatorLoc(); 1695 R1 = UO->getSubExpr()->getSourceRange(); 1696 return true; 1697 } 1698 case BinaryOperatorClass: { 1699 const BinaryOperator *BO = cast<BinaryOperator>(this); 1700 switch (BO->getOpcode()) { 1701 default: 1702 break; 1703 // Consider the RHS of comma for side effects. LHS was checked by 1704 // Sema::CheckCommaOperands. 1705 case BO_Comma: 1706 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1707 // lvalue-ness) of an assignment written in a macro. 1708 if (IntegerLiteral *IE = 1709 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1710 if (IE->getValue() == 0) 1711 return false; 1712 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1713 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1714 case BO_LAnd: 1715 case BO_LOr: 1716 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1717 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1718 return false; 1719 break; 1720 } 1721 if (BO->isAssignmentOp()) 1722 return false; 1723 Loc = BO->getOperatorLoc(); 1724 R1 = BO->getLHS()->getSourceRange(); 1725 R2 = BO->getRHS()->getSourceRange(); 1726 return true; 1727 } 1728 case CompoundAssignOperatorClass: 1729 case VAArgExprClass: 1730 case AtomicExprClass: 1731 return false; 1732 1733 case ConditionalOperatorClass: { 1734 // If only one of the LHS or RHS is a warning, the operator might 1735 // be being used for control flow. Only warn if both the LHS and 1736 // RHS are warnings. 1737 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1738 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1739 return false; 1740 if (!Exp->getLHS()) 1741 return true; 1742 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1743 } 1744 1745 case MemberExprClass: 1746 // If the base pointer or element is to a volatile pointer/field, accessing 1747 // it is a side effect. 1748 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1749 return false; 1750 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1751 R1 = SourceRange(Loc, Loc); 1752 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1753 return true; 1754 1755 case ArraySubscriptExprClass: 1756 // If the base pointer or element is to a volatile pointer/field, accessing 1757 // it is a side effect. 1758 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1759 return false; 1760 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1761 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1762 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1763 return true; 1764 1765 case CXXOperatorCallExprClass: { 1766 // We warn about operator== and operator!= even when user-defined operator 1767 // overloads as there is no reasonable way to define these such that they 1768 // have non-trivial, desirable side-effects. See the -Wunused-comparison 1769 // warning: these operators are commonly typo'ed, and so warning on them 1770 // provides additional value as well. If this list is updated, 1771 // DiagnoseUnusedComparison should be as well. 1772 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this); 1773 if (Op->getOperator() == OO_EqualEqual || 1774 Op->getOperator() == OO_ExclaimEqual) { 1775 Loc = Op->getOperatorLoc(); 1776 R1 = Op->getSourceRange(); 1777 return true; 1778 } 1779 1780 // Fallthrough for generic call handling. 1781 } 1782 case CallExprClass: 1783 case CXXMemberCallExprClass: 1784 case UserDefinedLiteralClass: { 1785 // If this is a direct call, get the callee. 1786 const CallExpr *CE = cast<CallExpr>(this); 1787 if (const Decl *FD = CE->getCalleeDecl()) { 1788 // If the callee has attribute pure, const, or warn_unused_result, warn 1789 // about it. void foo() { strlen("bar"); } should warn. 1790 // 1791 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1792 // updated to match for QoI. 1793 if (FD->getAttr<WarnUnusedResultAttr>() || 1794 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1795 Loc = CE->getCallee()->getLocStart(); 1796 R1 = CE->getCallee()->getSourceRange(); 1797 1798 if (unsigned NumArgs = CE->getNumArgs()) 1799 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1800 CE->getArg(NumArgs-1)->getLocEnd()); 1801 return true; 1802 } 1803 } 1804 return false; 1805 } 1806 1807 case CXXTemporaryObjectExprClass: 1808 case CXXConstructExprClass: 1809 return false; 1810 1811 case ObjCMessageExprClass: { 1812 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1813 if (Ctx.getLangOpts().ObjCAutoRefCount && 1814 ME->isInstanceMessage() && 1815 !ME->getType()->isVoidType() && 1816 ME->getSelector().getIdentifierInfoForSlot(0) && 1817 ME->getSelector().getIdentifierInfoForSlot(0) 1818 ->getName().startswith("init")) { 1819 Loc = getExprLoc(); 1820 R1 = ME->getSourceRange(); 1821 return true; 1822 } 1823 1824 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1825 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1826 Loc = getExprLoc(); 1827 return true; 1828 } 1829 return false; 1830 } 1831 1832 case ObjCPropertyRefExprClass: 1833 Loc = getExprLoc(); 1834 R1 = getSourceRange(); 1835 return true; 1836 1837 case PseudoObjectExprClass: { 1838 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this); 1839 1840 // Only complain about things that have the form of a getter. 1841 if (isa<UnaryOperator>(PO->getSyntacticForm()) || 1842 isa<BinaryOperator>(PO->getSyntacticForm())) 1843 return false; 1844 1845 Loc = getExprLoc(); 1846 R1 = getSourceRange(); 1847 return true; 1848 } 1849 1850 case StmtExprClass: { 1851 // Statement exprs don't logically have side effects themselves, but are 1852 // sometimes used in macros in ways that give them a type that is unused. 1853 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1854 // however, if the result of the stmt expr is dead, we don't want to emit a 1855 // warning. 1856 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1857 if (!CS->body_empty()) { 1858 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1859 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1860 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1861 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1862 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1863 } 1864 1865 if (getType()->isVoidType()) 1866 return false; 1867 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1868 R1 = getSourceRange(); 1869 return true; 1870 } 1871 case CStyleCastExprClass: 1872 // If this is an explicit cast to void, allow it. People do this when they 1873 // think they know what they're doing :). 1874 if (getType()->isVoidType()) 1875 return false; 1876 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1877 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1878 return true; 1879 case CXXFunctionalCastExprClass: { 1880 if (getType()->isVoidType()) 1881 return false; 1882 const CastExpr *CE = cast<CastExpr>(this); 1883 1884 // If this is a cast to void or a constructor conversion, check the operand. 1885 // Otherwise, the result of the cast is unused. 1886 if (CE->getCastKind() == CK_ToVoid || 1887 CE->getCastKind() == CK_ConstructorConversion) 1888 return (cast<CastExpr>(this)->getSubExpr() 1889 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1890 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1891 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1892 return true; 1893 } 1894 1895 case ImplicitCastExprClass: 1896 // Check the operand, since implicit casts are inserted by Sema 1897 return (cast<ImplicitCastExpr>(this) 1898 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1899 1900 case CXXDefaultArgExprClass: 1901 return (cast<CXXDefaultArgExpr>(this) 1902 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1903 1904 case CXXNewExprClass: 1905 // FIXME: In theory, there might be new expressions that don't have side 1906 // effects (e.g. a placement new with an uninitialized POD). 1907 case CXXDeleteExprClass: 1908 return false; 1909 case CXXBindTemporaryExprClass: 1910 return (cast<CXXBindTemporaryExpr>(this) 1911 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1912 case ExprWithCleanupsClass: 1913 return (cast<ExprWithCleanups>(this) 1914 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1915 } 1916} 1917 1918/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1919/// returns true, if it is; false otherwise. 1920bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1921 const Expr *E = IgnoreParens(); 1922 switch (E->getStmtClass()) { 1923 default: 1924 return false; 1925 case ObjCIvarRefExprClass: 1926 return true; 1927 case Expr::UnaryOperatorClass: 1928 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1929 case ImplicitCastExprClass: 1930 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1931 case MaterializeTemporaryExprClass: 1932 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr() 1933 ->isOBJCGCCandidate(Ctx); 1934 case CStyleCastExprClass: 1935 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 1936 case DeclRefExprClass: { 1937 const Decl *D = cast<DeclRefExpr>(E)->getDecl(); 1938 1939 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1940 if (VD->hasGlobalStorage()) 1941 return true; 1942 QualType T = VD->getType(); 1943 // dereferencing to a pointer is always a gc'able candidate, 1944 // unless it is __weak. 1945 return T->isPointerType() && 1946 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1947 } 1948 return false; 1949 } 1950 case MemberExprClass: { 1951 const MemberExpr *M = cast<MemberExpr>(E); 1952 return M->getBase()->isOBJCGCCandidate(Ctx); 1953 } 1954 case ArraySubscriptExprClass: 1955 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx); 1956 } 1957} 1958 1959bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1960 if (isTypeDependent()) 1961 return false; 1962 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1963} 1964 1965QualType Expr::findBoundMemberType(const Expr *expr) { 1966 assert(expr->hasPlaceholderType(BuiltinType::BoundMember)); 1967 1968 // Bound member expressions are always one of these possibilities: 1969 // x->m x.m x->*y x.*y 1970 // (possibly parenthesized) 1971 1972 expr = expr->IgnoreParens(); 1973 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) { 1974 assert(isa<CXXMethodDecl>(mem->getMemberDecl())); 1975 return mem->getMemberDecl()->getType(); 1976 } 1977 1978 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) { 1979 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>() 1980 ->getPointeeType(); 1981 assert(type->isFunctionType()); 1982 return type; 1983 } 1984 1985 assert(isa<UnresolvedMemberExpr>(expr)); 1986 return QualType(); 1987} 1988 1989static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1990 Expr::CanThrowResult CT2) { 1991 // CanThrowResult constants are ordered so that the maximum is the correct 1992 // merge result. 1993 return CT1 > CT2 ? CT1 : CT2; 1994} 1995 1996static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1997 Expr *E = const_cast<Expr*>(CE); 1998 Expr::CanThrowResult R = Expr::CT_Cannot; 1999 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) { 2000 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 2001 } 2002 return R; 2003} 2004 2005static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Expr *E, 2006 const Decl *D, 2007 bool NullThrows = true) { 2008 if (!D) 2009 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 2010 2011 // See if we can get a function type from the decl somehow. 2012 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 2013 if (!VD) // If we have no clue what we're calling, assume the worst. 2014 return Expr::CT_Can; 2015 2016 // As an extension, we assume that __attribute__((nothrow)) functions don't 2017 // throw. 2018 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 2019 return Expr::CT_Cannot; 2020 2021 QualType T = VD->getType(); 2022 const FunctionProtoType *FT; 2023 if ((FT = T->getAs<FunctionProtoType>())) { 2024 } else if (const PointerType *PT = T->getAs<PointerType>()) 2025 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 2026 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 2027 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 2028 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 2029 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 2030 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 2031 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 2032 2033 if (!FT) 2034 return Expr::CT_Can; 2035 2036 if (FT->getExceptionSpecType() == EST_Delayed) { 2037 assert(isa<CXXConstructorDecl>(D) && 2038 "only constructor exception specs can be unknown"); 2039 Ctx.getDiagnostics().Report(E->getLocStart(), 2040 diag::err_exception_spec_unknown) 2041 << E->getSourceRange(); 2042 return Expr::CT_Can; 2043 } 2044 2045 return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can; 2046} 2047 2048static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 2049 if (DC->isTypeDependent()) 2050 return Expr::CT_Dependent; 2051 2052 if (!DC->getTypeAsWritten()->isReferenceType()) 2053 return Expr::CT_Cannot; 2054 2055 if (DC->getSubExpr()->isTypeDependent()) 2056 return Expr::CT_Dependent; 2057 2058 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 2059} 2060 2061static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 2062 const CXXTypeidExpr *DC) { 2063 if (DC->isTypeOperand()) 2064 return Expr::CT_Cannot; 2065 2066 Expr *Op = DC->getExprOperand(); 2067 if (Op->isTypeDependent()) 2068 return Expr::CT_Dependent; 2069 2070 const RecordType *RT = Op->getType()->getAs<RecordType>(); 2071 if (!RT) 2072 return Expr::CT_Cannot; 2073 2074 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 2075 return Expr::CT_Cannot; 2076 2077 if (Op->Classify(C).isPRValue()) 2078 return Expr::CT_Cannot; 2079 2080 return Expr::CT_Can; 2081} 2082 2083Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 2084 // C++ [expr.unary.noexcept]p3: 2085 // [Can throw] if in a potentially-evaluated context the expression would 2086 // contain: 2087 switch (getStmtClass()) { 2088 case CXXThrowExprClass: 2089 // - a potentially evaluated throw-expression 2090 return CT_Can; 2091 2092 case CXXDynamicCastExprClass: { 2093 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 2094 // where T is a reference type, that requires a run-time check 2095 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 2096 if (CT == CT_Can) 2097 return CT; 2098 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2099 } 2100 2101 case CXXTypeidExprClass: 2102 // - a potentially evaluated typeid expression applied to a glvalue 2103 // expression whose type is a polymorphic class type 2104 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 2105 2106 // - a potentially evaluated call to a function, member function, function 2107 // pointer, or member function pointer that does not have a non-throwing 2108 // exception-specification 2109 case CallExprClass: 2110 case CXXMemberCallExprClass: 2111 case CXXOperatorCallExprClass: 2112 case UserDefinedLiteralClass: { 2113 const CallExpr *CE = cast<CallExpr>(this); 2114 CanThrowResult CT; 2115 if (isTypeDependent()) 2116 CT = CT_Dependent; 2117 else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) 2118 CT = CT_Cannot; 2119 else 2120 CT = CanCalleeThrow(C, this, CE->getCalleeDecl()); 2121 if (CT == CT_Can) 2122 return CT; 2123 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2124 } 2125 2126 case CXXConstructExprClass: 2127 case CXXTemporaryObjectExprClass: { 2128 CanThrowResult CT = CanCalleeThrow(C, this, 2129 cast<CXXConstructExpr>(this)->getConstructor()); 2130 if (CT == CT_Can) 2131 return CT; 2132 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2133 } 2134 2135 case LambdaExprClass: { 2136 const LambdaExpr *Lambda = cast<LambdaExpr>(this); 2137 CanThrowResult CT = Expr::CT_Cannot; 2138 for (LambdaExpr::capture_init_iterator Cap = Lambda->capture_init_begin(), 2139 CapEnd = Lambda->capture_init_end(); 2140 Cap != CapEnd; ++Cap) 2141 CT = MergeCanThrow(CT, (*Cap)->CanThrow(C)); 2142 return CT; 2143 } 2144 2145 case CXXNewExprClass: { 2146 CanThrowResult CT; 2147 if (isTypeDependent()) 2148 CT = CT_Dependent; 2149 else 2150 CT = CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getOperatorNew()); 2151 if (CT == CT_Can) 2152 return CT; 2153 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2154 } 2155 2156 case CXXDeleteExprClass: { 2157 CanThrowResult CT; 2158 QualType DTy = cast<CXXDeleteExpr>(this)->getDestroyedType(); 2159 if (DTy.isNull() || DTy->isDependentType()) { 2160 CT = CT_Dependent; 2161 } else { 2162 CT = CanCalleeThrow(C, this, 2163 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 2164 if (const RecordType *RT = DTy->getAs<RecordType>()) { 2165 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2166 CT = MergeCanThrow(CT, CanCalleeThrow(C, this, RD->getDestructor())); 2167 } 2168 if (CT == CT_Can) 2169 return CT; 2170 } 2171 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2172 } 2173 2174 case CXXBindTemporaryExprClass: { 2175 // The bound temporary has to be destroyed again, which might throw. 2176 CanThrowResult CT = CanCalleeThrow(C, this, 2177 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 2178 if (CT == CT_Can) 2179 return CT; 2180 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2181 } 2182 2183 // ObjC message sends are like function calls, but never have exception 2184 // specs. 2185 case ObjCMessageExprClass: 2186 case ObjCPropertyRefExprClass: 2187 case ObjCSubscriptRefExprClass: 2188 return CT_Can; 2189 2190 // All the ObjC literals that are implemented as calls are 2191 // potentially throwing unless we decide to close off that 2192 // possibility. 2193 case ObjCArrayLiteralClass: 2194 case ObjCDictionaryLiteralClass: 2195 case ObjCNumericLiteralClass: 2196 return CT_Can; 2197 2198 // Many other things have subexpressions, so we have to test those. 2199 // Some are simple: 2200 case ConditionalOperatorClass: 2201 case CompoundLiteralExprClass: 2202 case CXXConstCastExprClass: 2203 case CXXDefaultArgExprClass: 2204 case CXXReinterpretCastExprClass: 2205 case DesignatedInitExprClass: 2206 case ExprWithCleanupsClass: 2207 case ExtVectorElementExprClass: 2208 case InitListExprClass: 2209 case MemberExprClass: 2210 case ObjCIsaExprClass: 2211 case ObjCIvarRefExprClass: 2212 case ParenExprClass: 2213 case ParenListExprClass: 2214 case ShuffleVectorExprClass: 2215 case VAArgExprClass: 2216 return CanSubExprsThrow(C, this); 2217 2218 // Some might be dependent for other reasons. 2219 case ArraySubscriptExprClass: 2220 case BinaryOperatorClass: 2221 case CompoundAssignOperatorClass: 2222 case CStyleCastExprClass: 2223 case CXXStaticCastExprClass: 2224 case CXXFunctionalCastExprClass: 2225 case ImplicitCastExprClass: 2226 case MaterializeTemporaryExprClass: 2227 case UnaryOperatorClass: { 2228 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 2229 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 2230 } 2231 2232 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 2233 case StmtExprClass: 2234 return CT_Can; 2235 2236 case ChooseExprClass: 2237 if (isTypeDependent() || isValueDependent()) 2238 return CT_Dependent; 2239 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 2240 2241 case GenericSelectionExprClass: 2242 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2243 return CT_Dependent; 2244 return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C); 2245 2246 // Some expressions are always dependent. 2247 case CXXDependentScopeMemberExprClass: 2248 case CXXUnresolvedConstructExprClass: 2249 case DependentScopeDeclRefExprClass: 2250 return CT_Dependent; 2251 2252 case AtomicExprClass: 2253 case AsTypeExprClass: 2254 case BinaryConditionalOperatorClass: 2255 case BlockExprClass: 2256 case CUDAKernelCallExprClass: 2257 case DeclRefExprClass: 2258 case ObjCBridgedCastExprClass: 2259 case ObjCIndirectCopyRestoreExprClass: 2260 case ObjCProtocolExprClass: 2261 case ObjCSelectorExprClass: 2262 case OffsetOfExprClass: 2263 case PackExpansionExprClass: 2264 case PseudoObjectExprClass: 2265 case SubstNonTypeTemplateParmExprClass: 2266 case SubstNonTypeTemplateParmPackExprClass: 2267 case UnaryExprOrTypeTraitExprClass: 2268 case UnresolvedLookupExprClass: 2269 case UnresolvedMemberExprClass: 2270 // FIXME: Can any of the above throw? If so, when? 2271 return CT_Cannot; 2272 2273 case AddrLabelExprClass: 2274 case ArrayTypeTraitExprClass: 2275 case BinaryTypeTraitExprClass: 2276 case TypeTraitExprClass: 2277 case CXXBoolLiteralExprClass: 2278 case CXXNoexceptExprClass: 2279 case CXXNullPtrLiteralExprClass: 2280 case CXXPseudoDestructorExprClass: 2281 case CXXScalarValueInitExprClass: 2282 case CXXThisExprClass: 2283 case CXXUuidofExprClass: 2284 case CharacterLiteralClass: 2285 case ExpressionTraitExprClass: 2286 case FloatingLiteralClass: 2287 case GNUNullExprClass: 2288 case ImaginaryLiteralClass: 2289 case ImplicitValueInitExprClass: 2290 case IntegerLiteralClass: 2291 case ObjCEncodeExprClass: 2292 case ObjCStringLiteralClass: 2293 case ObjCBoolLiteralExprClass: 2294 case OpaqueValueExprClass: 2295 case PredefinedExprClass: 2296 case SizeOfPackExprClass: 2297 case StringLiteralClass: 2298 case UnaryTypeTraitExprClass: 2299 // These expressions can never throw. 2300 return CT_Cannot; 2301 2302#define STMT(CLASS, PARENT) case CLASS##Class: 2303#define STMT_RANGE(Base, First, Last) 2304#define LAST_STMT_RANGE(BASE, FIRST, LAST) 2305#define EXPR(CLASS, PARENT) 2306#define ABSTRACT_STMT(STMT) 2307#include "clang/AST/StmtNodes.inc" 2308 case NoStmtClass: 2309 llvm_unreachable("Invalid class for expression"); 2310 } 2311 llvm_unreachable("Bogus StmtClass"); 2312} 2313 2314Expr* Expr::IgnoreParens() { 2315 Expr* E = this; 2316 while (true) { 2317 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2318 E = P->getSubExpr(); 2319 continue; 2320 } 2321 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2322 if (P->getOpcode() == UO_Extension) { 2323 E = P->getSubExpr(); 2324 continue; 2325 } 2326 } 2327 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2328 if (!P->isResultDependent()) { 2329 E = P->getResultExpr(); 2330 continue; 2331 } 2332 } 2333 return E; 2334 } 2335} 2336 2337/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 2338/// or CastExprs or ImplicitCastExprs, returning their operand. 2339Expr *Expr::IgnoreParenCasts() { 2340 Expr *E = this; 2341 while (true) { 2342 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2343 E = P->getSubExpr(); 2344 continue; 2345 } 2346 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2347 E = P->getSubExpr(); 2348 continue; 2349 } 2350 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2351 if (P->getOpcode() == UO_Extension) { 2352 E = P->getSubExpr(); 2353 continue; 2354 } 2355 } 2356 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2357 if (!P->isResultDependent()) { 2358 E = P->getResultExpr(); 2359 continue; 2360 } 2361 } 2362 if (MaterializeTemporaryExpr *Materialize 2363 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2364 E = Materialize->GetTemporaryExpr(); 2365 continue; 2366 } 2367 if (SubstNonTypeTemplateParmExpr *NTTP 2368 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2369 E = NTTP->getReplacement(); 2370 continue; 2371 } 2372 return E; 2373 } 2374} 2375 2376/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 2377/// casts. This is intended purely as a temporary workaround for code 2378/// that hasn't yet been rewritten to do the right thing about those 2379/// casts, and may disappear along with the last internal use. 2380Expr *Expr::IgnoreParenLValueCasts() { 2381 Expr *E = this; 2382 while (true) { 2383 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2384 E = P->getSubExpr(); 2385 continue; 2386 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2387 if (P->getCastKind() == CK_LValueToRValue) { 2388 E = P->getSubExpr(); 2389 continue; 2390 } 2391 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2392 if (P->getOpcode() == UO_Extension) { 2393 E = P->getSubExpr(); 2394 continue; 2395 } 2396 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2397 if (!P->isResultDependent()) { 2398 E = P->getResultExpr(); 2399 continue; 2400 } 2401 } else if (MaterializeTemporaryExpr *Materialize 2402 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2403 E = Materialize->GetTemporaryExpr(); 2404 continue; 2405 } else if (SubstNonTypeTemplateParmExpr *NTTP 2406 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2407 E = NTTP->getReplacement(); 2408 continue; 2409 } 2410 break; 2411 } 2412 return E; 2413} 2414 2415Expr *Expr::IgnoreParenImpCasts() { 2416 Expr *E = this; 2417 while (true) { 2418 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2419 E = P->getSubExpr(); 2420 continue; 2421 } 2422 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 2423 E = P->getSubExpr(); 2424 continue; 2425 } 2426 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2427 if (P->getOpcode() == UO_Extension) { 2428 E = P->getSubExpr(); 2429 continue; 2430 } 2431 } 2432 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2433 if (!P->isResultDependent()) { 2434 E = P->getResultExpr(); 2435 continue; 2436 } 2437 } 2438 if (MaterializeTemporaryExpr *Materialize 2439 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2440 E = Materialize->GetTemporaryExpr(); 2441 continue; 2442 } 2443 if (SubstNonTypeTemplateParmExpr *NTTP 2444 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2445 E = NTTP->getReplacement(); 2446 continue; 2447 } 2448 return E; 2449 } 2450} 2451 2452Expr *Expr::IgnoreConversionOperator() { 2453 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) { 2454 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl())) 2455 return MCE->getImplicitObjectArgument(); 2456 } 2457 return this; 2458} 2459 2460/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 2461/// value (including ptr->int casts of the same size). Strip off any 2462/// ParenExpr or CastExprs, returning their operand. 2463Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 2464 Expr *E = this; 2465 while (true) { 2466 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2467 E = P->getSubExpr(); 2468 continue; 2469 } 2470 2471 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2472 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 2473 // ptr<->int casts of the same width. We also ignore all identity casts. 2474 Expr *SE = P->getSubExpr(); 2475 2476 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 2477 E = SE; 2478 continue; 2479 } 2480 2481 if ((E->getType()->isPointerType() || 2482 E->getType()->isIntegralType(Ctx)) && 2483 (SE->getType()->isPointerType() || 2484 SE->getType()->isIntegralType(Ctx)) && 2485 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 2486 E = SE; 2487 continue; 2488 } 2489 } 2490 2491 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2492 if (P->getOpcode() == UO_Extension) { 2493 E = P->getSubExpr(); 2494 continue; 2495 } 2496 } 2497 2498 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2499 if (!P->isResultDependent()) { 2500 E = P->getResultExpr(); 2501 continue; 2502 } 2503 } 2504 2505 if (SubstNonTypeTemplateParmExpr *NTTP 2506 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2507 E = NTTP->getReplacement(); 2508 continue; 2509 } 2510 2511 return E; 2512 } 2513} 2514 2515bool Expr::isDefaultArgument() const { 2516 const Expr *E = this; 2517 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2518 E = M->GetTemporaryExpr(); 2519 2520 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 2521 E = ICE->getSubExprAsWritten(); 2522 2523 return isa<CXXDefaultArgExpr>(E); 2524} 2525 2526/// \brief Skip over any no-op casts and any temporary-binding 2527/// expressions. 2528static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 2529 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2530 E = M->GetTemporaryExpr(); 2531 2532 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2533 if (ICE->getCastKind() == CK_NoOp) 2534 E = ICE->getSubExpr(); 2535 else 2536 break; 2537 } 2538 2539 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2540 E = BE->getSubExpr(); 2541 2542 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2543 if (ICE->getCastKind() == CK_NoOp) 2544 E = ICE->getSubExpr(); 2545 else 2546 break; 2547 } 2548 2549 return E->IgnoreParens(); 2550} 2551 2552/// isTemporaryObject - Determines if this expression produces a 2553/// temporary of the given class type. 2554bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2555 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2556 return false; 2557 2558 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2559 2560 // Temporaries are by definition pr-values of class type. 2561 if (!E->Classify(C).isPRValue()) { 2562 // In this context, property reference is a message call and is pr-value. 2563 if (!isa<ObjCPropertyRefExpr>(E)) 2564 return false; 2565 } 2566 2567 // Black-list a few cases which yield pr-values of class type that don't 2568 // refer to temporaries of that type: 2569 2570 // - implicit derived-to-base conversions 2571 if (isa<ImplicitCastExpr>(E)) { 2572 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2573 case CK_DerivedToBase: 2574 case CK_UncheckedDerivedToBase: 2575 return false; 2576 default: 2577 break; 2578 } 2579 } 2580 2581 // - member expressions (all) 2582 if (isa<MemberExpr>(E)) 2583 return false; 2584 2585 // - opaque values (all) 2586 if (isa<OpaqueValueExpr>(E)) 2587 return false; 2588 2589 return true; 2590} 2591 2592bool Expr::isImplicitCXXThis() const { 2593 const Expr *E = this; 2594 2595 // Strip away parentheses and casts we don't care about. 2596 while (true) { 2597 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2598 E = Paren->getSubExpr(); 2599 continue; 2600 } 2601 2602 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2603 if (ICE->getCastKind() == CK_NoOp || 2604 ICE->getCastKind() == CK_LValueToRValue || 2605 ICE->getCastKind() == CK_DerivedToBase || 2606 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2607 E = ICE->getSubExpr(); 2608 continue; 2609 } 2610 } 2611 2612 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2613 if (UnOp->getOpcode() == UO_Extension) { 2614 E = UnOp->getSubExpr(); 2615 continue; 2616 } 2617 } 2618 2619 if (const MaterializeTemporaryExpr *M 2620 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2621 E = M->GetTemporaryExpr(); 2622 continue; 2623 } 2624 2625 break; 2626 } 2627 2628 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2629 return This->isImplicit(); 2630 2631 return false; 2632} 2633 2634/// hasAnyTypeDependentArguments - Determines if any of the expressions 2635/// in Exprs is type-dependent. 2636bool Expr::hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs) { 2637 for (unsigned I = 0; I < Exprs.size(); ++I) 2638 if (Exprs[I]->isTypeDependent()) 2639 return true; 2640 2641 return false; 2642} 2643 2644bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2645 // This function is attempting whether an expression is an initializer 2646 // which can be evaluated at compile-time. isEvaluatable handles most 2647 // of the cases, but it can't deal with some initializer-specific 2648 // expressions, and it can't deal with aggregates; we deal with those here, 2649 // and fall back to isEvaluatable for the other cases. 2650 2651 // If we ever capture reference-binding directly in the AST, we can 2652 // kill the second parameter. 2653 2654 if (IsForRef) { 2655 EvalResult Result; 2656 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2657 } 2658 2659 switch (getStmtClass()) { 2660 default: break; 2661 case IntegerLiteralClass: 2662 case FloatingLiteralClass: 2663 case StringLiteralClass: 2664 case ObjCStringLiteralClass: 2665 case ObjCEncodeExprClass: 2666 return true; 2667 case CXXTemporaryObjectExprClass: 2668 case CXXConstructExprClass: { 2669 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2670 2671 // Only if it's 2672 if (CE->getConstructor()->isTrivial()) { 2673 // 1) an application of the trivial default constructor or 2674 if (!CE->getNumArgs()) return true; 2675 2676 // 2) an elidable trivial copy construction of an operand which is 2677 // itself a constant initializer. Note that we consider the 2678 // operand on its own, *not* as a reference binding. 2679 if (CE->isElidable() && 2680 CE->getArg(0)->isConstantInitializer(Ctx, false)) 2681 return true; 2682 } 2683 2684 // 3) a foldable constexpr constructor. 2685 break; 2686 } 2687 case CompoundLiteralExprClass: { 2688 // This handles gcc's extension that allows global initializers like 2689 // "struct x {int x;} x = (struct x) {};". 2690 // FIXME: This accepts other cases it shouldn't! 2691 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2692 return Exp->isConstantInitializer(Ctx, false); 2693 } 2694 case InitListExprClass: { 2695 // FIXME: This doesn't deal with fields with reference types correctly. 2696 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2697 // to bitfields. 2698 const InitListExpr *Exp = cast<InitListExpr>(this); 2699 unsigned numInits = Exp->getNumInits(); 2700 for (unsigned i = 0; i < numInits; i++) { 2701 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2702 return false; 2703 } 2704 return true; 2705 } 2706 case ImplicitValueInitExprClass: 2707 return true; 2708 case ParenExprClass: 2709 return cast<ParenExpr>(this)->getSubExpr() 2710 ->isConstantInitializer(Ctx, IsForRef); 2711 case GenericSelectionExprClass: 2712 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2713 return false; 2714 return cast<GenericSelectionExpr>(this)->getResultExpr() 2715 ->isConstantInitializer(Ctx, IsForRef); 2716 case ChooseExprClass: 2717 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2718 ->isConstantInitializer(Ctx, IsForRef); 2719 case UnaryOperatorClass: { 2720 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2721 if (Exp->getOpcode() == UO_Extension) 2722 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2723 break; 2724 } 2725 case CXXFunctionalCastExprClass: 2726 case CXXStaticCastExprClass: 2727 case ImplicitCastExprClass: 2728 case CStyleCastExprClass: { 2729 const CastExpr *CE = cast<CastExpr>(this); 2730 2731 // If we're promoting an integer to an _Atomic type then this is constant 2732 // if the integer is constant. We also need to check the converse in case 2733 // someone does something like: 2734 // 2735 // int a = (_Atomic(int))42; 2736 // 2737 // I doubt anyone would write code like this directly, but it's quite 2738 // possible as the result of macro expansions. 2739 if (CE->getCastKind() == CK_NonAtomicToAtomic || 2740 CE->getCastKind() == CK_AtomicToNonAtomic) 2741 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2742 2743 // Handle bitcasts of vector constants. 2744 if (getType()->isVectorType() && CE->getCastKind() == CK_BitCast) 2745 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2746 2747 // Handle misc casts we want to ignore. 2748 // FIXME: Is it really safe to ignore all these? 2749 if (CE->getCastKind() == CK_NoOp || 2750 CE->getCastKind() == CK_LValueToRValue || 2751 CE->getCastKind() == CK_ToUnion || 2752 CE->getCastKind() == CK_ConstructorConversion) 2753 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2754 2755 break; 2756 } 2757 case MaterializeTemporaryExprClass: 2758 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr() 2759 ->isConstantInitializer(Ctx, false); 2760 } 2761 return isEvaluatable(Ctx); 2762} 2763 2764namespace { 2765 /// \brief Look for a call to a non-trivial function within an expression. 2766 class NonTrivialCallFinder : public EvaluatedExprVisitor<NonTrivialCallFinder> 2767 { 2768 typedef EvaluatedExprVisitor<NonTrivialCallFinder> Inherited; 2769 2770 bool NonTrivial; 2771 2772 public: 2773 explicit NonTrivialCallFinder(ASTContext &Context) 2774 : Inherited(Context), NonTrivial(false) { } 2775 2776 bool hasNonTrivialCall() const { return NonTrivial; } 2777 2778 void VisitCallExpr(CallExpr *E) { 2779 if (CXXMethodDecl *Method 2780 = dyn_cast_or_null<CXXMethodDecl>(E->getCalleeDecl())) { 2781 if (Method->isTrivial()) { 2782 // Recurse to children of the call. 2783 Inherited::VisitStmt(E); 2784 return; 2785 } 2786 } 2787 2788 NonTrivial = true; 2789 } 2790 2791 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2792 if (E->getConstructor()->isTrivial()) { 2793 // Recurse to children of the call. 2794 Inherited::VisitStmt(E); 2795 return; 2796 } 2797 2798 NonTrivial = true; 2799 } 2800 2801 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 2802 if (E->getTemporary()->getDestructor()->isTrivial()) { 2803 Inherited::VisitStmt(E); 2804 return; 2805 } 2806 2807 NonTrivial = true; 2808 } 2809 }; 2810} 2811 2812bool Expr::hasNonTrivialCall(ASTContext &Ctx) { 2813 NonTrivialCallFinder Finder(Ctx); 2814 Finder.Visit(this); 2815 return Finder.hasNonTrivialCall(); 2816} 2817 2818/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2819/// pointer constant or not, as well as the specific kind of constant detected. 2820/// Null pointer constants can be integer constant expressions with the 2821/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2822/// (a GNU extension). 2823Expr::NullPointerConstantKind 2824Expr::isNullPointerConstant(ASTContext &Ctx, 2825 NullPointerConstantValueDependence NPC) const { 2826 if (isValueDependent()) { 2827 switch (NPC) { 2828 case NPC_NeverValueDependent: 2829 llvm_unreachable("Unexpected value dependent expression!"); 2830 case NPC_ValueDependentIsNull: 2831 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2832 return NPCK_ZeroInteger; 2833 else 2834 return NPCK_NotNull; 2835 2836 case NPC_ValueDependentIsNotNull: 2837 return NPCK_NotNull; 2838 } 2839 } 2840 2841 // Strip off a cast to void*, if it exists. Except in C++. 2842 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2843 if (!Ctx.getLangOpts().CPlusPlus) { 2844 // Check that it is a cast to void*. 2845 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2846 QualType Pointee = PT->getPointeeType(); 2847 if (!Pointee.hasQualifiers() && 2848 Pointee->isVoidType() && // to void* 2849 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2850 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2851 } 2852 } 2853 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2854 // Ignore the ImplicitCastExpr type entirely. 2855 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2856 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2857 // Accept ((void*)0) as a null pointer constant, as many other 2858 // implementations do. 2859 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2860 } else if (const GenericSelectionExpr *GE = 2861 dyn_cast<GenericSelectionExpr>(this)) { 2862 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC); 2863 } else if (const CXXDefaultArgExpr *DefaultArg 2864 = dyn_cast<CXXDefaultArgExpr>(this)) { 2865 // See through default argument expressions 2866 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2867 } else if (isa<GNUNullExpr>(this)) { 2868 // The GNU __null extension is always a null pointer constant. 2869 return NPCK_GNUNull; 2870 } else if (const MaterializeTemporaryExpr *M 2871 = dyn_cast<MaterializeTemporaryExpr>(this)) { 2872 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC); 2873 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) { 2874 if (const Expr *Source = OVE->getSourceExpr()) 2875 return Source->isNullPointerConstant(Ctx, NPC); 2876 } 2877 2878 // C++0x nullptr_t is always a null pointer constant. 2879 if (getType()->isNullPtrType()) 2880 return NPCK_CXX0X_nullptr; 2881 2882 if (const RecordType *UT = getType()->getAsUnionType()) 2883 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2884 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2885 const Expr *InitExpr = CLE->getInitializer(); 2886 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2887 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2888 } 2889 // This expression must be an integer type. 2890 if (!getType()->isIntegerType() || 2891 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType())) 2892 return NPCK_NotNull; 2893 2894 // If we have an integer constant expression, we need to *evaluate* it and 2895 // test for the value 0. Don't use the C++11 constant expression semantics 2896 // for this, for now; once the dust settles on core issue 903, we might only 2897 // allow a literal 0 here in C++11 mode. 2898 if (Ctx.getLangOpts().CPlusPlus0x) { 2899 if (!isCXX98IntegralConstantExpr(Ctx)) 2900 return NPCK_NotNull; 2901 } else { 2902 if (!isIntegerConstantExpr(Ctx)) 2903 return NPCK_NotNull; 2904 } 2905 2906 return (EvaluateKnownConstInt(Ctx) == 0) ? NPCK_ZeroInteger : NPCK_NotNull; 2907} 2908 2909/// \brief If this expression is an l-value for an Objective C 2910/// property, find the underlying property reference expression. 2911const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2912 const Expr *E = this; 2913 while (true) { 2914 assert((E->getValueKind() == VK_LValue && 2915 E->getObjectKind() == OK_ObjCProperty) && 2916 "expression is not a property reference"); 2917 E = E->IgnoreParenCasts(); 2918 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2919 if (BO->getOpcode() == BO_Comma) { 2920 E = BO->getRHS(); 2921 continue; 2922 } 2923 } 2924 2925 break; 2926 } 2927 2928 return cast<ObjCPropertyRefExpr>(E); 2929} 2930 2931FieldDecl *Expr::getBitField() { 2932 Expr *E = this->IgnoreParens(); 2933 2934 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2935 if (ICE->getCastKind() == CK_LValueToRValue || 2936 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2937 E = ICE->getSubExpr()->IgnoreParens(); 2938 else 2939 break; 2940 } 2941 2942 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2943 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2944 if (Field->isBitField()) 2945 return Field; 2946 2947 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2948 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2949 if (Field->isBitField()) 2950 return Field; 2951 2952 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) { 2953 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2954 return BinOp->getLHS()->getBitField(); 2955 2956 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS()) 2957 return BinOp->getRHS()->getBitField(); 2958 } 2959 2960 return 0; 2961} 2962 2963bool Expr::refersToVectorElement() const { 2964 const Expr *E = this->IgnoreParens(); 2965 2966 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2967 if (ICE->getValueKind() != VK_RValue && 2968 ICE->getCastKind() == CK_NoOp) 2969 E = ICE->getSubExpr()->IgnoreParens(); 2970 else 2971 break; 2972 } 2973 2974 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2975 return ASE->getBase()->getType()->isVectorType(); 2976 2977 if (isa<ExtVectorElementExpr>(E)) 2978 return true; 2979 2980 return false; 2981} 2982 2983/// isArrow - Return true if the base expression is a pointer to vector, 2984/// return false if the base expression is a vector. 2985bool ExtVectorElementExpr::isArrow() const { 2986 return getBase()->getType()->isPointerType(); 2987} 2988 2989unsigned ExtVectorElementExpr::getNumElements() const { 2990 if (const VectorType *VT = getType()->getAs<VectorType>()) 2991 return VT->getNumElements(); 2992 return 1; 2993} 2994 2995/// containsDuplicateElements - Return true if any element access is repeated. 2996bool ExtVectorElementExpr::containsDuplicateElements() const { 2997 // FIXME: Refactor this code to an accessor on the AST node which returns the 2998 // "type" of component access, and share with code below and in Sema. 2999 StringRef Comp = Accessor->getName(); 3000 3001 // Halving swizzles do not contain duplicate elements. 3002 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 3003 return false; 3004 3005 // Advance past s-char prefix on hex swizzles. 3006 if (Comp[0] == 's' || Comp[0] == 'S') 3007 Comp = Comp.substr(1); 3008 3009 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 3010 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos) 3011 return true; 3012 3013 return false; 3014} 3015 3016/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 3017void ExtVectorElementExpr::getEncodedElementAccess( 3018 SmallVectorImpl<unsigned> &Elts) const { 3019 StringRef Comp = Accessor->getName(); 3020 if (Comp[0] == 's' || Comp[0] == 'S') 3021 Comp = Comp.substr(1); 3022 3023 bool isHi = Comp == "hi"; 3024 bool isLo = Comp == "lo"; 3025 bool isEven = Comp == "even"; 3026 bool isOdd = Comp == "odd"; 3027 3028 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 3029 uint64_t Index; 3030 3031 if (isHi) 3032 Index = e + i; 3033 else if (isLo) 3034 Index = i; 3035 else if (isEven) 3036 Index = 2 * i; 3037 else if (isOdd) 3038 Index = 2 * i + 1; 3039 else 3040 Index = ExtVectorType::getAccessorIdx(Comp[i]); 3041 3042 Elts.push_back(Index); 3043 } 3044} 3045 3046ObjCMessageExpr::ObjCMessageExpr(QualType T, 3047 ExprValueKind VK, 3048 SourceLocation LBracLoc, 3049 SourceLocation SuperLoc, 3050 bool IsInstanceSuper, 3051 QualType SuperType, 3052 Selector Sel, 3053 ArrayRef<SourceLocation> SelLocs, 3054 SelectorLocationsKind SelLocsK, 3055 ObjCMethodDecl *Method, 3056 ArrayRef<Expr *> Args, 3057 SourceLocation RBracLoc, 3058 bool isImplicit) 3059 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 3060 /*TypeDependent=*/false, /*ValueDependent=*/false, 3061 /*InstantiationDependent=*/false, 3062 /*ContainsUnexpandedParameterPack=*/false), 3063 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3064 : Sel.getAsOpaquePtr())), 3065 Kind(IsInstanceSuper? SuperInstance : SuperClass), 3066 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3067 SuperLoc(SuperLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3068{ 3069 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3070 setReceiverPointer(SuperType.getAsOpaquePtr()); 3071} 3072 3073ObjCMessageExpr::ObjCMessageExpr(QualType T, 3074 ExprValueKind VK, 3075 SourceLocation LBracLoc, 3076 TypeSourceInfo *Receiver, 3077 Selector Sel, 3078 ArrayRef<SourceLocation> SelLocs, 3079 SelectorLocationsKind SelLocsK, 3080 ObjCMethodDecl *Method, 3081 ArrayRef<Expr *> Args, 3082 SourceLocation RBracLoc, 3083 bool isImplicit) 3084 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 3085 T->isDependentType(), T->isInstantiationDependentType(), 3086 T->containsUnexpandedParameterPack()), 3087 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3088 : Sel.getAsOpaquePtr())), 3089 Kind(Class), 3090 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3091 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3092{ 3093 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3094 setReceiverPointer(Receiver); 3095} 3096 3097ObjCMessageExpr::ObjCMessageExpr(QualType T, 3098 ExprValueKind VK, 3099 SourceLocation LBracLoc, 3100 Expr *Receiver, 3101 Selector Sel, 3102 ArrayRef<SourceLocation> SelLocs, 3103 SelectorLocationsKind SelLocsK, 3104 ObjCMethodDecl *Method, 3105 ArrayRef<Expr *> Args, 3106 SourceLocation RBracLoc, 3107 bool isImplicit) 3108 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 3109 Receiver->isTypeDependent(), 3110 Receiver->isInstantiationDependent(), 3111 Receiver->containsUnexpandedParameterPack()), 3112 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 3113 : Sel.getAsOpaquePtr())), 3114 Kind(Instance), 3115 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 3116 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 3117{ 3118 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 3119 setReceiverPointer(Receiver); 3120} 3121 3122void ObjCMessageExpr::initArgsAndSelLocs(ArrayRef<Expr *> Args, 3123 ArrayRef<SourceLocation> SelLocs, 3124 SelectorLocationsKind SelLocsK) { 3125 setNumArgs(Args.size()); 3126 Expr **MyArgs = getArgs(); 3127 for (unsigned I = 0; I != Args.size(); ++I) { 3128 if (Args[I]->isTypeDependent()) 3129 ExprBits.TypeDependent = true; 3130 if (Args[I]->isValueDependent()) 3131 ExprBits.ValueDependent = true; 3132 if (Args[I]->isInstantiationDependent()) 3133 ExprBits.InstantiationDependent = true; 3134 if (Args[I]->containsUnexpandedParameterPack()) 3135 ExprBits.ContainsUnexpandedParameterPack = true; 3136 3137 MyArgs[I] = Args[I]; 3138 } 3139 3140 SelLocsKind = SelLocsK; 3141 if (!isImplicit()) { 3142 if (SelLocsK == SelLoc_NonStandard) 3143 std::copy(SelLocs.begin(), SelLocs.end(), getStoredSelLocs()); 3144 } 3145} 3146 3147ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3148 ExprValueKind VK, 3149 SourceLocation LBracLoc, 3150 SourceLocation SuperLoc, 3151 bool IsInstanceSuper, 3152 QualType SuperType, 3153 Selector Sel, 3154 ArrayRef<SourceLocation> SelLocs, 3155 ObjCMethodDecl *Method, 3156 ArrayRef<Expr *> Args, 3157 SourceLocation RBracLoc, 3158 bool isImplicit) { 3159 assert((!SelLocs.empty() || isImplicit) && 3160 "No selector locs for non-implicit message"); 3161 ObjCMessageExpr *Mem; 3162 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3163 if (isImplicit) 3164 Mem = alloc(Context, Args.size(), 0); 3165 else 3166 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3167 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 3168 SuperType, Sel, SelLocs, SelLocsK, 3169 Method, Args, RBracLoc, isImplicit); 3170} 3171 3172ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3173 ExprValueKind VK, 3174 SourceLocation LBracLoc, 3175 TypeSourceInfo *Receiver, 3176 Selector Sel, 3177 ArrayRef<SourceLocation> SelLocs, 3178 ObjCMethodDecl *Method, 3179 ArrayRef<Expr *> Args, 3180 SourceLocation RBracLoc, 3181 bool isImplicit) { 3182 assert((!SelLocs.empty() || isImplicit) && 3183 "No selector locs for non-implicit message"); 3184 ObjCMessageExpr *Mem; 3185 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3186 if (isImplicit) 3187 Mem = alloc(Context, Args.size(), 0); 3188 else 3189 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3190 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3191 SelLocs, SelLocsK, Method, Args, RBracLoc, 3192 isImplicit); 3193} 3194 3195ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3196 ExprValueKind VK, 3197 SourceLocation LBracLoc, 3198 Expr *Receiver, 3199 Selector Sel, 3200 ArrayRef<SourceLocation> SelLocs, 3201 ObjCMethodDecl *Method, 3202 ArrayRef<Expr *> Args, 3203 SourceLocation RBracLoc, 3204 bool isImplicit) { 3205 assert((!SelLocs.empty() || isImplicit) && 3206 "No selector locs for non-implicit message"); 3207 ObjCMessageExpr *Mem; 3208 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3209 if (isImplicit) 3210 Mem = alloc(Context, Args.size(), 0); 3211 else 3212 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3213 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3214 SelLocs, SelLocsK, Method, Args, RBracLoc, 3215 isImplicit); 3216} 3217 3218ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 3219 unsigned NumArgs, 3220 unsigned NumStoredSelLocs) { 3221 ObjCMessageExpr *Mem = alloc(Context, NumArgs, NumStoredSelLocs); 3222 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 3223} 3224 3225ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3226 ArrayRef<Expr *> Args, 3227 SourceLocation RBraceLoc, 3228 ArrayRef<SourceLocation> SelLocs, 3229 Selector Sel, 3230 SelectorLocationsKind &SelLocsK) { 3231 SelLocsK = hasStandardSelectorLocs(Sel, SelLocs, Args, RBraceLoc); 3232 unsigned NumStoredSelLocs = (SelLocsK == SelLoc_NonStandard) ? SelLocs.size() 3233 : 0; 3234 return alloc(C, Args.size(), NumStoredSelLocs); 3235} 3236 3237ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3238 unsigned NumArgs, 3239 unsigned NumStoredSelLocs) { 3240 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 3241 NumArgs * sizeof(Expr *) + NumStoredSelLocs * sizeof(SourceLocation); 3242 return (ObjCMessageExpr *)C.Allocate(Size, 3243 llvm::AlignOf<ObjCMessageExpr>::Alignment); 3244} 3245 3246void ObjCMessageExpr::getSelectorLocs( 3247 SmallVectorImpl<SourceLocation> &SelLocs) const { 3248 for (unsigned i = 0, e = getNumSelectorLocs(); i != e; ++i) 3249 SelLocs.push_back(getSelectorLoc(i)); 3250} 3251 3252SourceRange ObjCMessageExpr::getReceiverRange() const { 3253 switch (getReceiverKind()) { 3254 case Instance: 3255 return getInstanceReceiver()->getSourceRange(); 3256 3257 case Class: 3258 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 3259 3260 case SuperInstance: 3261 case SuperClass: 3262 return getSuperLoc(); 3263 } 3264 3265 llvm_unreachable("Invalid ReceiverKind!"); 3266} 3267 3268Selector ObjCMessageExpr::getSelector() const { 3269 if (HasMethod) 3270 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 3271 ->getSelector(); 3272 return Selector(SelectorOrMethod); 3273} 3274 3275ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 3276 switch (getReceiverKind()) { 3277 case Instance: 3278 if (const ObjCObjectPointerType *Ptr 3279 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 3280 return Ptr->getInterfaceDecl(); 3281 break; 3282 3283 case Class: 3284 if (const ObjCObjectType *Ty 3285 = getClassReceiver()->getAs<ObjCObjectType>()) 3286 return Ty->getInterface(); 3287 break; 3288 3289 case SuperInstance: 3290 if (const ObjCObjectPointerType *Ptr 3291 = getSuperType()->getAs<ObjCObjectPointerType>()) 3292 return Ptr->getInterfaceDecl(); 3293 break; 3294 3295 case SuperClass: 3296 if (const ObjCObjectType *Iface 3297 = getSuperType()->getAs<ObjCObjectType>()) 3298 return Iface->getInterface(); 3299 break; 3300 } 3301 3302 return 0; 3303} 3304 3305StringRef ObjCBridgedCastExpr::getBridgeKindName() const { 3306 switch (getBridgeKind()) { 3307 case OBC_Bridge: 3308 return "__bridge"; 3309 case OBC_BridgeTransfer: 3310 return "__bridge_transfer"; 3311 case OBC_BridgeRetained: 3312 return "__bridge_retained"; 3313 } 3314 3315 llvm_unreachable("Invalid BridgeKind!"); 3316} 3317 3318bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 3319 return getCond()->EvaluateKnownConstInt(C) != 0; 3320} 3321 3322ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3323 QualType Type, SourceLocation BLoc, 3324 SourceLocation RP) 3325 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 3326 Type->isDependentType(), Type->isDependentType(), 3327 Type->isInstantiationDependentType(), 3328 Type->containsUnexpandedParameterPack()), 3329 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 3330{ 3331 SubExprs = new (C) Stmt*[nexpr]; 3332 for (unsigned i = 0; i < nexpr; i++) { 3333 if (args[i]->isTypeDependent()) 3334 ExprBits.TypeDependent = true; 3335 if (args[i]->isValueDependent()) 3336 ExprBits.ValueDependent = true; 3337 if (args[i]->isInstantiationDependent()) 3338 ExprBits.InstantiationDependent = true; 3339 if (args[i]->containsUnexpandedParameterPack()) 3340 ExprBits.ContainsUnexpandedParameterPack = true; 3341 3342 SubExprs[i] = args[i]; 3343 } 3344} 3345 3346void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 3347 unsigned NumExprs) { 3348 if (SubExprs) C.Deallocate(SubExprs); 3349 3350 SubExprs = new (C) Stmt* [NumExprs]; 3351 this->NumExprs = NumExprs; 3352 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 3353} 3354 3355GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3356 SourceLocation GenericLoc, Expr *ControllingExpr, 3357 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3358 unsigned NumAssocs, SourceLocation DefaultLoc, 3359 SourceLocation RParenLoc, 3360 bool ContainsUnexpandedParameterPack, 3361 unsigned ResultIndex) 3362 : Expr(GenericSelectionExprClass, 3363 AssocExprs[ResultIndex]->getType(), 3364 AssocExprs[ResultIndex]->getValueKind(), 3365 AssocExprs[ResultIndex]->getObjectKind(), 3366 AssocExprs[ResultIndex]->isTypeDependent(), 3367 AssocExprs[ResultIndex]->isValueDependent(), 3368 AssocExprs[ResultIndex]->isInstantiationDependent(), 3369 ContainsUnexpandedParameterPack), 3370 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3371 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3372 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3373 RParenLoc(RParenLoc) { 3374 SubExprs[CONTROLLING] = ControllingExpr; 3375 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3376 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3377} 3378 3379GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3380 SourceLocation GenericLoc, Expr *ControllingExpr, 3381 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3382 unsigned NumAssocs, SourceLocation DefaultLoc, 3383 SourceLocation RParenLoc, 3384 bool ContainsUnexpandedParameterPack) 3385 : Expr(GenericSelectionExprClass, 3386 Context.DependentTy, 3387 VK_RValue, 3388 OK_Ordinary, 3389 /*isTypeDependent=*/true, 3390 /*isValueDependent=*/true, 3391 /*isInstantiationDependent=*/true, 3392 ContainsUnexpandedParameterPack), 3393 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3394 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3395 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3396 RParenLoc(RParenLoc) { 3397 SubExprs[CONTROLLING] = ControllingExpr; 3398 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3399 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3400} 3401 3402//===----------------------------------------------------------------------===// 3403// DesignatedInitExpr 3404//===----------------------------------------------------------------------===// 3405 3406IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const { 3407 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3408 if (Field.NameOrField & 0x01) 3409 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 3410 else 3411 return getField()->getIdentifier(); 3412} 3413 3414DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 3415 unsigned NumDesignators, 3416 const Designator *Designators, 3417 SourceLocation EqualOrColonLoc, 3418 bool GNUSyntax, 3419 Expr **IndexExprs, 3420 unsigned NumIndexExprs, 3421 Expr *Init) 3422 : Expr(DesignatedInitExprClass, Ty, 3423 Init->getValueKind(), Init->getObjectKind(), 3424 Init->isTypeDependent(), Init->isValueDependent(), 3425 Init->isInstantiationDependent(), 3426 Init->containsUnexpandedParameterPack()), 3427 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 3428 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 3429 this->Designators = new (C) Designator[NumDesignators]; 3430 3431 // Record the initializer itself. 3432 child_range Child = children(); 3433 *Child++ = Init; 3434 3435 // Copy the designators and their subexpressions, computing 3436 // value-dependence along the way. 3437 unsigned IndexIdx = 0; 3438 for (unsigned I = 0; I != NumDesignators; ++I) { 3439 this->Designators[I] = Designators[I]; 3440 3441 if (this->Designators[I].isArrayDesignator()) { 3442 // Compute type- and value-dependence. 3443 Expr *Index = IndexExprs[IndexIdx]; 3444 if (Index->isTypeDependent() || Index->isValueDependent()) 3445 ExprBits.ValueDependent = true; 3446 if (Index->isInstantiationDependent()) 3447 ExprBits.InstantiationDependent = true; 3448 // Propagate unexpanded parameter packs. 3449 if (Index->containsUnexpandedParameterPack()) 3450 ExprBits.ContainsUnexpandedParameterPack = true; 3451 3452 // Copy the index expressions into permanent storage. 3453 *Child++ = IndexExprs[IndexIdx++]; 3454 } else if (this->Designators[I].isArrayRangeDesignator()) { 3455 // Compute type- and value-dependence. 3456 Expr *Start = IndexExprs[IndexIdx]; 3457 Expr *End = IndexExprs[IndexIdx + 1]; 3458 if (Start->isTypeDependent() || Start->isValueDependent() || 3459 End->isTypeDependent() || End->isValueDependent()) { 3460 ExprBits.ValueDependent = true; 3461 ExprBits.InstantiationDependent = true; 3462 } else if (Start->isInstantiationDependent() || 3463 End->isInstantiationDependent()) { 3464 ExprBits.InstantiationDependent = true; 3465 } 3466 3467 // Propagate unexpanded parameter packs. 3468 if (Start->containsUnexpandedParameterPack() || 3469 End->containsUnexpandedParameterPack()) 3470 ExprBits.ContainsUnexpandedParameterPack = true; 3471 3472 // Copy the start/end expressions into permanent storage. 3473 *Child++ = IndexExprs[IndexIdx++]; 3474 *Child++ = IndexExprs[IndexIdx++]; 3475 } 3476 } 3477 3478 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 3479} 3480 3481DesignatedInitExpr * 3482DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 3483 unsigned NumDesignators, 3484 Expr **IndexExprs, unsigned NumIndexExprs, 3485 SourceLocation ColonOrEqualLoc, 3486 bool UsesColonSyntax, Expr *Init) { 3487 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3488 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3489 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 3490 ColonOrEqualLoc, UsesColonSyntax, 3491 IndexExprs, NumIndexExprs, Init); 3492} 3493 3494DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 3495 unsigned NumIndexExprs) { 3496 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3497 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3498 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 3499} 3500 3501void DesignatedInitExpr::setDesignators(ASTContext &C, 3502 const Designator *Desigs, 3503 unsigned NumDesigs) { 3504 Designators = new (C) Designator[NumDesigs]; 3505 NumDesignators = NumDesigs; 3506 for (unsigned I = 0; I != NumDesigs; ++I) 3507 Designators[I] = Desigs[I]; 3508} 3509 3510SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { 3511 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this); 3512 if (size() == 1) 3513 return DIE->getDesignator(0)->getSourceRange(); 3514 return SourceRange(DIE->getDesignator(0)->getStartLocation(), 3515 DIE->getDesignator(size()-1)->getEndLocation()); 3516} 3517 3518SourceRange DesignatedInitExpr::getSourceRange() const { 3519 SourceLocation StartLoc; 3520 Designator &First = 3521 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 3522 if (First.isFieldDesignator()) { 3523 if (GNUSyntax) 3524 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 3525 else 3526 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 3527 } else 3528 StartLoc = 3529 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 3530 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 3531} 3532 3533Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 3534 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 3535 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3536 Ptr += sizeof(DesignatedInitExpr); 3537 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3538 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3539} 3540 3541Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 3542 assert(D.Kind == Designator::ArrayRangeDesignator && 3543 "Requires array range designator"); 3544 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3545 Ptr += sizeof(DesignatedInitExpr); 3546 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3547 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3548} 3549 3550Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 3551 assert(D.Kind == Designator::ArrayRangeDesignator && 3552 "Requires array range designator"); 3553 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3554 Ptr += sizeof(DesignatedInitExpr); 3555 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3556 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 3557} 3558 3559/// \brief Replaces the designator at index @p Idx with the series 3560/// of designators in [First, Last). 3561void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 3562 const Designator *First, 3563 const Designator *Last) { 3564 unsigned NumNewDesignators = Last - First; 3565 if (NumNewDesignators == 0) { 3566 std::copy_backward(Designators + Idx + 1, 3567 Designators + NumDesignators, 3568 Designators + Idx); 3569 --NumNewDesignators; 3570 return; 3571 } else if (NumNewDesignators == 1) { 3572 Designators[Idx] = *First; 3573 return; 3574 } 3575 3576 Designator *NewDesignators 3577 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 3578 std::copy(Designators, Designators + Idx, NewDesignators); 3579 std::copy(First, Last, NewDesignators + Idx); 3580 std::copy(Designators + Idx + 1, Designators + NumDesignators, 3581 NewDesignators + Idx + NumNewDesignators); 3582 Designators = NewDesignators; 3583 NumDesignators = NumDesignators - 1 + NumNewDesignators; 3584} 3585 3586ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 3587 Expr **exprs, unsigned nexprs, 3588 SourceLocation rparenloc) 3589 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 3590 false, false, false, false), 3591 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 3592 Exprs = new (C) Stmt*[nexprs]; 3593 for (unsigned i = 0; i != nexprs; ++i) { 3594 if (exprs[i]->isTypeDependent()) 3595 ExprBits.TypeDependent = true; 3596 if (exprs[i]->isValueDependent()) 3597 ExprBits.ValueDependent = true; 3598 if (exprs[i]->isInstantiationDependent()) 3599 ExprBits.InstantiationDependent = true; 3600 if (exprs[i]->containsUnexpandedParameterPack()) 3601 ExprBits.ContainsUnexpandedParameterPack = true; 3602 3603 Exprs[i] = exprs[i]; 3604 } 3605} 3606 3607const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 3608 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 3609 e = ewc->getSubExpr(); 3610 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e)) 3611 e = m->GetTemporaryExpr(); 3612 e = cast<CXXConstructExpr>(e)->getArg(0); 3613 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3614 e = ice->getSubExpr(); 3615 return cast<OpaqueValueExpr>(e); 3616} 3617 3618PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &Context, EmptyShell sh, 3619 unsigned numSemanticExprs) { 3620 void *buffer = Context.Allocate(sizeof(PseudoObjectExpr) + 3621 (1 + numSemanticExprs) * sizeof(Expr*), 3622 llvm::alignOf<PseudoObjectExpr>()); 3623 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs); 3624} 3625 3626PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs) 3627 : Expr(PseudoObjectExprClass, shell) { 3628 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1; 3629} 3630 3631PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &C, Expr *syntax, 3632 ArrayRef<Expr*> semantics, 3633 unsigned resultIndex) { 3634 assert(syntax && "no syntactic expression!"); 3635 assert(semantics.size() && "no semantic expressions!"); 3636 3637 QualType type; 3638 ExprValueKind VK; 3639 if (resultIndex == NoResult) { 3640 type = C.VoidTy; 3641 VK = VK_RValue; 3642 } else { 3643 assert(resultIndex < semantics.size()); 3644 type = semantics[resultIndex]->getType(); 3645 VK = semantics[resultIndex]->getValueKind(); 3646 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary); 3647 } 3648 3649 void *buffer = C.Allocate(sizeof(PseudoObjectExpr) + 3650 (1 + semantics.size()) * sizeof(Expr*), 3651 llvm::alignOf<PseudoObjectExpr>()); 3652 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics, 3653 resultIndex); 3654} 3655 3656PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK, 3657 Expr *syntax, ArrayRef<Expr*> semantics, 3658 unsigned resultIndex) 3659 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary, 3660 /*filled in at end of ctor*/ false, false, false, false) { 3661 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1; 3662 PseudoObjectExprBits.ResultIndex = resultIndex + 1; 3663 3664 for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) { 3665 Expr *E = (i == 0 ? syntax : semantics[i-1]); 3666 getSubExprsBuffer()[i] = E; 3667 3668 if (E->isTypeDependent()) 3669 ExprBits.TypeDependent = true; 3670 if (E->isValueDependent()) 3671 ExprBits.ValueDependent = true; 3672 if (E->isInstantiationDependent()) 3673 ExprBits.InstantiationDependent = true; 3674 if (E->containsUnexpandedParameterPack()) 3675 ExprBits.ContainsUnexpandedParameterPack = true; 3676 3677 if (isa<OpaqueValueExpr>(E)) 3678 assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != 0 && 3679 "opaque-value semantic expressions for pseudo-object " 3680 "operations must have sources"); 3681 } 3682} 3683 3684//===----------------------------------------------------------------------===// 3685// ExprIterator. 3686//===----------------------------------------------------------------------===// 3687 3688Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 3689Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 3690Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 3691const Expr* ConstExprIterator::operator[](size_t idx) const { 3692 return cast<Expr>(I[idx]); 3693} 3694const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 3695const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 3696 3697//===----------------------------------------------------------------------===// 3698// Child Iterators for iterating over subexpressions/substatements 3699//===----------------------------------------------------------------------===// 3700 3701// UnaryExprOrTypeTraitExpr 3702Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 3703 // If this is of a type and the type is a VLA type (and not a typedef), the 3704 // size expression of the VLA needs to be treated as an executable expression. 3705 // Why isn't this weirdness documented better in StmtIterator? 3706 if (isArgumentType()) { 3707 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 3708 getArgumentType().getTypePtr())) 3709 return child_range(child_iterator(T), child_iterator()); 3710 return child_range(); 3711 } 3712 return child_range(&Argument.Ex, &Argument.Ex + 1); 3713} 3714 3715// ObjCMessageExpr 3716Stmt::child_range ObjCMessageExpr::children() { 3717 Stmt **begin; 3718 if (getReceiverKind() == Instance) 3719 begin = reinterpret_cast<Stmt **>(this + 1); 3720 else 3721 begin = reinterpret_cast<Stmt **>(getArgs()); 3722 return child_range(begin, 3723 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 3724} 3725 3726ObjCArrayLiteral::ObjCArrayLiteral(llvm::ArrayRef<Expr *> Elements, 3727 QualType T, ObjCMethodDecl *Method, 3728 SourceRange SR) 3729 : Expr(ObjCArrayLiteralClass, T, VK_RValue, OK_Ordinary, 3730 false, false, false, false), 3731 NumElements(Elements.size()), Range(SR), ArrayWithObjectsMethod(Method) 3732{ 3733 Expr **SaveElements = getElements(); 3734 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 3735 if (Elements[I]->isTypeDependent() || Elements[I]->isValueDependent()) 3736 ExprBits.ValueDependent = true; 3737 if (Elements[I]->isInstantiationDependent()) 3738 ExprBits.InstantiationDependent = true; 3739 if (Elements[I]->containsUnexpandedParameterPack()) 3740 ExprBits.ContainsUnexpandedParameterPack = true; 3741 3742 SaveElements[I] = Elements[I]; 3743 } 3744} 3745 3746ObjCArrayLiteral *ObjCArrayLiteral::Create(ASTContext &C, 3747 llvm::ArrayRef<Expr *> Elements, 3748 QualType T, ObjCMethodDecl * Method, 3749 SourceRange SR) { 3750 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3751 + Elements.size() * sizeof(Expr *)); 3752 return new (Mem) ObjCArrayLiteral(Elements, T, Method, SR); 3753} 3754 3755ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(ASTContext &C, 3756 unsigned NumElements) { 3757 3758 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3759 + NumElements * sizeof(Expr *)); 3760 return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements); 3761} 3762 3763ObjCDictionaryLiteral::ObjCDictionaryLiteral( 3764 ArrayRef<ObjCDictionaryElement> VK, 3765 bool HasPackExpansions, 3766 QualType T, ObjCMethodDecl *method, 3767 SourceRange SR) 3768 : Expr(ObjCDictionaryLiteralClass, T, VK_RValue, OK_Ordinary, false, false, 3769 false, false), 3770 NumElements(VK.size()), HasPackExpansions(HasPackExpansions), Range(SR), 3771 DictWithObjectsMethod(method) 3772{ 3773 KeyValuePair *KeyValues = getKeyValues(); 3774 ExpansionData *Expansions = getExpansionData(); 3775 for (unsigned I = 0; I < NumElements; I++) { 3776 if (VK[I].Key->isTypeDependent() || VK[I].Key->isValueDependent() || 3777 VK[I].Value->isTypeDependent() || VK[I].Value->isValueDependent()) 3778 ExprBits.ValueDependent = true; 3779 if (VK[I].Key->isInstantiationDependent() || 3780 VK[I].Value->isInstantiationDependent()) 3781 ExprBits.InstantiationDependent = true; 3782 if (VK[I].EllipsisLoc.isInvalid() && 3783 (VK[I].Key->containsUnexpandedParameterPack() || 3784 VK[I].Value->containsUnexpandedParameterPack())) 3785 ExprBits.ContainsUnexpandedParameterPack = true; 3786 3787 KeyValues[I].Key = VK[I].Key; 3788 KeyValues[I].Value = VK[I].Value; 3789 if (Expansions) { 3790 Expansions[I].EllipsisLoc = VK[I].EllipsisLoc; 3791 if (VK[I].NumExpansions) 3792 Expansions[I].NumExpansionsPlusOne = *VK[I].NumExpansions + 1; 3793 else 3794 Expansions[I].NumExpansionsPlusOne = 0; 3795 } 3796 } 3797} 3798 3799ObjCDictionaryLiteral * 3800ObjCDictionaryLiteral::Create(ASTContext &C, 3801 ArrayRef<ObjCDictionaryElement> VK, 3802 bool HasPackExpansions, 3803 QualType T, ObjCMethodDecl *method, 3804 SourceRange SR) { 3805 unsigned ExpansionsSize = 0; 3806 if (HasPackExpansions) 3807 ExpansionsSize = sizeof(ExpansionData) * VK.size(); 3808 3809 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3810 sizeof(KeyValuePair) * VK.size() + ExpansionsSize); 3811 return new (Mem) ObjCDictionaryLiteral(VK, HasPackExpansions, T, method, SR); 3812} 3813 3814ObjCDictionaryLiteral * 3815ObjCDictionaryLiteral::CreateEmpty(ASTContext &C, unsigned NumElements, 3816 bool HasPackExpansions) { 3817 unsigned ExpansionsSize = 0; 3818 if (HasPackExpansions) 3819 ExpansionsSize = sizeof(ExpansionData) * NumElements; 3820 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3821 sizeof(KeyValuePair) * NumElements + ExpansionsSize); 3822 return new (Mem) ObjCDictionaryLiteral(EmptyShell(), NumElements, 3823 HasPackExpansions); 3824} 3825 3826ObjCSubscriptRefExpr *ObjCSubscriptRefExpr::Create(ASTContext &C, 3827 Expr *base, 3828 Expr *key, QualType T, 3829 ObjCMethodDecl *getMethod, 3830 ObjCMethodDecl *setMethod, 3831 SourceLocation RB) { 3832 void *Mem = C.Allocate(sizeof(ObjCSubscriptRefExpr)); 3833 return new (Mem) ObjCSubscriptRefExpr(base, key, T, VK_LValue, 3834 OK_ObjCSubscript, 3835 getMethod, setMethod, RB); 3836} 3837 3838AtomicExpr::AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, 3839 QualType t, AtomicOp op, SourceLocation RP) 3840 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 3841 false, false, false, false), 3842 NumSubExprs(nexpr), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) 3843{ 3844 assert(nexpr == getNumSubExprs(op) && "wrong number of subexpressions"); 3845 for (unsigned i = 0; i < nexpr; i++) { 3846 if (args[i]->isTypeDependent()) 3847 ExprBits.TypeDependent = true; 3848 if (args[i]->isValueDependent()) 3849 ExprBits.ValueDependent = true; 3850 if (args[i]->isInstantiationDependent()) 3851 ExprBits.InstantiationDependent = true; 3852 if (args[i]->containsUnexpandedParameterPack()) 3853 ExprBits.ContainsUnexpandedParameterPack = true; 3854 3855 SubExprs[i] = args[i]; 3856 } 3857} 3858 3859unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) { 3860 switch (Op) { 3861 case Init: 3862 case Load: 3863 return 2; 3864 case Store: 3865 case Xchg: 3866 case Add: 3867 case Sub: 3868 case And: 3869 case Or: 3870 case Xor: 3871 return 3; 3872 case CmpXchgStrong: 3873 case CmpXchgWeak: 3874 return 5; 3875 } 3876 llvm_unreachable("unknown atomic op"); 3877} 3878