Expr.cpp revision 0b4fe503ef00d9f8ea330850d3e3b303e9c7c876
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 36const CXXRecordDecl *Expr::getMostDerivedClassDeclForType() const { 37 const Expr *E = this; 38 39 while (true) { 40 E = E->IgnoreParens(); 41 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) { 42 if (CE->getCastKind() == CK_DerivedToBase || 43 CE->getCastKind() == CK_UncheckedDerivedToBase || 44 CE->getCastKind() == CK_NoOp) { 45 E = CE->getSubExpr(); 46 continue; 47 } 48 } 49 50 break; 51 } 52 53 QualType DerivedType = E->getType(); 54 if (DerivedType->isDependentType()) 55 return NULL; 56 if (const PointerType *PTy = DerivedType->getAs<PointerType>()) 57 DerivedType = PTy->getPointeeType(); 58 59 const RecordType *Ty = DerivedType->castAs<RecordType>(); 60 if (!Ty) 61 return NULL; 62 63 Decl *D = Ty->getDecl(); 64 return cast<CXXRecordDecl>(D); 65} 66 67/// isKnownToHaveBooleanValue - Return true if this is an integer expression 68/// that is known to return 0 or 1. This happens for _Bool/bool expressions 69/// but also int expressions which are produced by things like comparisons in 70/// C. 71bool Expr::isKnownToHaveBooleanValue() const { 72 const Expr *E = IgnoreParens(); 73 74 // If this value has _Bool type, it is obvious 0/1. 75 if (E->getType()->isBooleanType()) return true; 76 // If this is a non-scalar-integer type, we don't care enough to try. 77 if (!E->getType()->isIntegralOrEnumerationType()) return false; 78 79 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) { 80 switch (UO->getOpcode()) { 81 case UO_Plus: 82 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 83 default: 84 return false; 85 } 86 } 87 88 // Only look through implicit casts. If the user writes 89 // '(int) (a && b)' treat it as an arbitrary int. 90 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E)) 91 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 92 93 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 94 switch (BO->getOpcode()) { 95 default: return false; 96 case BO_LT: // Relational operators. 97 case BO_GT: 98 case BO_LE: 99 case BO_GE: 100 case BO_EQ: // Equality operators. 101 case BO_NE: 102 case BO_LAnd: // AND operator. 103 case BO_LOr: // Logical OR operator. 104 return true; 105 106 case BO_And: // Bitwise AND operator. 107 case BO_Xor: // Bitwise XOR operator. 108 case BO_Or: // Bitwise OR operator. 109 // Handle things like (x==2)|(y==12). 110 return BO->getLHS()->isKnownToHaveBooleanValue() && 111 BO->getRHS()->isKnownToHaveBooleanValue(); 112 113 case BO_Comma: 114 case BO_Assign: 115 return BO->getRHS()->isKnownToHaveBooleanValue(); 116 } 117 } 118 119 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) 120 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 121 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 122 123 return false; 124} 125 126// Amusing macro metaprogramming hack: check whether a class provides 127// a more specific implementation of getExprLoc(). 128// 129// See also Stmt.cpp:{getLocStart(),getLocEnd()}. 130namespace { 131 /// This implementation is used when a class provides a custom 132 /// implementation of getExprLoc. 133 template <class E, class T> 134 SourceLocation getExprLocImpl(const Expr *expr, 135 SourceLocation (T::*v)() const) { 136 return static_cast<const E*>(expr)->getExprLoc(); 137 } 138 139 /// This implementation is used when a class doesn't provide 140 /// a custom implementation of getExprLoc. Overload resolution 141 /// should pick it over the implementation above because it's 142 /// more specialized according to function template partial ordering. 143 template <class E> 144 SourceLocation getExprLocImpl(const Expr *expr, 145 SourceLocation (Expr::*v)() const) { 146 return static_cast<const E*>(expr)->getLocStart(); 147 } 148} 149 150SourceLocation Expr::getExprLoc() const { 151 switch (getStmtClass()) { 152 case Stmt::NoStmtClass: llvm_unreachable("statement without class"); 153#define ABSTRACT_STMT(type) 154#define STMT(type, base) \ 155 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break; 156#define EXPR(type, base) \ 157 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc); 158#include "clang/AST/StmtNodes.inc" 159 } 160 llvm_unreachable("unknown statement kind"); 161} 162 163//===----------------------------------------------------------------------===// 164// Primary Expressions. 165//===----------------------------------------------------------------------===// 166 167/// \brief Compute the type-, value-, and instantiation-dependence of a 168/// declaration reference 169/// based on the declaration being referenced. 170static void computeDeclRefDependence(ASTContext &Ctx, NamedDecl *D, QualType T, 171 bool &TypeDependent, 172 bool &ValueDependent, 173 bool &InstantiationDependent) { 174 TypeDependent = false; 175 ValueDependent = false; 176 InstantiationDependent = false; 177 178 // (TD) C++ [temp.dep.expr]p3: 179 // An id-expression is type-dependent if it contains: 180 // 181 // and 182 // 183 // (VD) C++ [temp.dep.constexpr]p2: 184 // An identifier is value-dependent if it is: 185 186 // (TD) - an identifier that was declared with dependent type 187 // (VD) - a name declared with a dependent type, 188 if (T->isDependentType()) { 189 TypeDependent = true; 190 ValueDependent = true; 191 InstantiationDependent = true; 192 return; 193 } else if (T->isInstantiationDependentType()) { 194 InstantiationDependent = true; 195 } 196 197 // (TD) - a conversion-function-id that specifies a dependent type 198 if (D->getDeclName().getNameKind() 199 == DeclarationName::CXXConversionFunctionName) { 200 QualType T = D->getDeclName().getCXXNameType(); 201 if (T->isDependentType()) { 202 TypeDependent = true; 203 ValueDependent = true; 204 InstantiationDependent = true; 205 return; 206 } 207 208 if (T->isInstantiationDependentType()) 209 InstantiationDependent = true; 210 } 211 212 // (VD) - the name of a non-type template parameter, 213 if (isa<NonTypeTemplateParmDecl>(D)) { 214 ValueDependent = true; 215 InstantiationDependent = true; 216 return; 217 } 218 219 // (VD) - a constant with integral or enumeration type and is 220 // initialized with an expression that is value-dependent. 221 // (VD) - a constant with literal type and is initialized with an 222 // expression that is value-dependent [C++11]. 223 // (VD) - FIXME: Missing from the standard: 224 // - an entity with reference type and is initialized with an 225 // expression that is value-dependent [C++11] 226 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 227 if ((Ctx.getLangOpts().CPlusPlus0x ? 228 Var->getType()->isLiteralType() : 229 Var->getType()->isIntegralOrEnumerationType()) && 230 (Var->getType().getCVRQualifiers() == Qualifiers::Const || 231 Var->getType()->isReferenceType())) { 232 if (const Expr *Init = Var->getAnyInitializer()) 233 if (Init->isValueDependent()) { 234 ValueDependent = true; 235 InstantiationDependent = true; 236 } 237 } 238 239 // (VD) - FIXME: Missing from the standard: 240 // - a member function or a static data member of the current 241 // instantiation 242 if (Var->isStaticDataMember() && 243 Var->getDeclContext()->isDependentContext()) { 244 ValueDependent = true; 245 InstantiationDependent = true; 246 } 247 248 return; 249 } 250 251 // (VD) - FIXME: Missing from the standard: 252 // - a member function or a static data member of the current 253 // instantiation 254 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) { 255 ValueDependent = true; 256 InstantiationDependent = true; 257 } 258} 259 260void DeclRefExpr::computeDependence(ASTContext &Ctx) { 261 bool TypeDependent = false; 262 bool ValueDependent = false; 263 bool InstantiationDependent = false; 264 computeDeclRefDependence(Ctx, getDecl(), getType(), TypeDependent, 265 ValueDependent, InstantiationDependent); 266 267 // (TD) C++ [temp.dep.expr]p3: 268 // An id-expression is type-dependent if it contains: 269 // 270 // and 271 // 272 // (VD) C++ [temp.dep.constexpr]p2: 273 // An identifier is value-dependent if it is: 274 if (!TypeDependent && !ValueDependent && 275 hasExplicitTemplateArgs() && 276 TemplateSpecializationType::anyDependentTemplateArguments( 277 getTemplateArgs(), 278 getNumTemplateArgs(), 279 InstantiationDependent)) { 280 TypeDependent = true; 281 ValueDependent = true; 282 InstantiationDependent = true; 283 } 284 285 ExprBits.TypeDependent = TypeDependent; 286 ExprBits.ValueDependent = ValueDependent; 287 ExprBits.InstantiationDependent = InstantiationDependent; 288 289 // Is the declaration a parameter pack? 290 if (getDecl()->isParameterPack()) 291 ExprBits.ContainsUnexpandedParameterPack = true; 292} 293 294DeclRefExpr::DeclRefExpr(ASTContext &Ctx, 295 NestedNameSpecifierLoc QualifierLoc, 296 SourceLocation TemplateKWLoc, 297 ValueDecl *D, bool RefersToEnclosingLocal, 298 const DeclarationNameInfo &NameInfo, 299 NamedDecl *FoundD, 300 const TemplateArgumentListInfo *TemplateArgs, 301 QualType T, ExprValueKind VK) 302 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 303 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 304 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0; 305 if (QualifierLoc) 306 getInternalQualifierLoc() = QualifierLoc; 307 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0; 308 if (FoundD) 309 getInternalFoundDecl() = FoundD; 310 DeclRefExprBits.HasTemplateKWAndArgsInfo 311 = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0; 312 DeclRefExprBits.RefersToEnclosingLocal = RefersToEnclosingLocal; 313 if (TemplateArgs) { 314 bool Dependent = false; 315 bool InstantiationDependent = false; 316 bool ContainsUnexpandedParameterPack = false; 317 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *TemplateArgs, 318 Dependent, 319 InstantiationDependent, 320 ContainsUnexpandedParameterPack); 321 if (InstantiationDependent) 322 setInstantiationDependent(true); 323 } else if (TemplateKWLoc.isValid()) { 324 getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 325 } 326 DeclRefExprBits.HadMultipleCandidates = 0; 327 328 computeDependence(Ctx); 329} 330 331DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 332 NestedNameSpecifierLoc QualifierLoc, 333 SourceLocation TemplateKWLoc, 334 ValueDecl *D, 335 bool RefersToEnclosingLocal, 336 SourceLocation NameLoc, 337 QualType T, 338 ExprValueKind VK, 339 NamedDecl *FoundD, 340 const TemplateArgumentListInfo *TemplateArgs) { 341 return Create(Context, QualifierLoc, TemplateKWLoc, D, 342 RefersToEnclosingLocal, 343 DeclarationNameInfo(D->getDeclName(), NameLoc), 344 T, VK, FoundD, TemplateArgs); 345} 346 347DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 348 NestedNameSpecifierLoc QualifierLoc, 349 SourceLocation TemplateKWLoc, 350 ValueDecl *D, 351 bool RefersToEnclosingLocal, 352 const DeclarationNameInfo &NameInfo, 353 QualType T, 354 ExprValueKind VK, 355 NamedDecl *FoundD, 356 const TemplateArgumentListInfo *TemplateArgs) { 357 // Filter out cases where the found Decl is the same as the value refenenced. 358 if (D == FoundD) 359 FoundD = 0; 360 361 std::size_t Size = sizeof(DeclRefExpr); 362 if (QualifierLoc != 0) 363 Size += sizeof(NestedNameSpecifierLoc); 364 if (FoundD) 365 Size += sizeof(NamedDecl *); 366 if (TemplateArgs) 367 Size += ASTTemplateKWAndArgsInfo::sizeFor(TemplateArgs->size()); 368 else if (TemplateKWLoc.isValid()) 369 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 370 371 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 372 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D, 373 RefersToEnclosingLocal, 374 NameInfo, FoundD, TemplateArgs, T, VK); 375} 376 377DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, 378 bool HasQualifier, 379 bool HasFoundDecl, 380 bool HasTemplateKWAndArgsInfo, 381 unsigned NumTemplateArgs) { 382 std::size_t Size = sizeof(DeclRefExpr); 383 if (HasQualifier) 384 Size += sizeof(NestedNameSpecifierLoc); 385 if (HasFoundDecl) 386 Size += sizeof(NamedDecl *); 387 if (HasTemplateKWAndArgsInfo) 388 Size += ASTTemplateKWAndArgsInfo::sizeFor(NumTemplateArgs); 389 390 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 391 return new (Mem) DeclRefExpr(EmptyShell()); 392} 393 394SourceRange DeclRefExpr::getSourceRange() const { 395 SourceRange R = getNameInfo().getSourceRange(); 396 if (hasQualifier()) 397 R.setBegin(getQualifierLoc().getBeginLoc()); 398 if (hasExplicitTemplateArgs()) 399 R.setEnd(getRAngleLoc()); 400 return R; 401} 402SourceLocation DeclRefExpr::getLocStart() const { 403 if (hasQualifier()) 404 return getQualifierLoc().getBeginLoc(); 405 return getNameInfo().getLocStart(); 406} 407SourceLocation DeclRefExpr::getLocEnd() const { 408 if (hasExplicitTemplateArgs()) 409 return getRAngleLoc(); 410 return getNameInfo().getLocEnd(); 411} 412 413// FIXME: Maybe this should use DeclPrinter with a special "print predefined 414// expr" policy instead. 415std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 416 ASTContext &Context = CurrentDecl->getASTContext(); 417 418 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 419 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 420 return FD->getNameAsString(); 421 422 SmallString<256> Name; 423 llvm::raw_svector_ostream Out(Name); 424 425 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 426 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 427 Out << "virtual "; 428 if (MD->isStatic()) 429 Out << "static "; 430 } 431 432 PrintingPolicy Policy(Context.getLangOpts()); 433 std::string Proto = FD->getQualifiedNameAsString(Policy); 434 llvm::raw_string_ostream POut(Proto); 435 436 const FunctionDecl *Decl = FD; 437 if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern()) 438 Decl = Pattern; 439 const FunctionType *AFT = Decl->getType()->getAs<FunctionType>(); 440 const FunctionProtoType *FT = 0; 441 if (FD->hasWrittenPrototype()) 442 FT = dyn_cast<FunctionProtoType>(AFT); 443 444 POut << "("; 445 if (FT) { 446 for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) { 447 if (i) POut << ", "; 448 POut << Decl->getParamDecl(i)->getType().stream(Policy); 449 } 450 451 if (FT->isVariadic()) { 452 if (FD->getNumParams()) POut << ", "; 453 POut << "..."; 454 } 455 } 456 POut << ")"; 457 458 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 459 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 460 if (ThisQuals.hasConst()) 461 POut << " const"; 462 if (ThisQuals.hasVolatile()) 463 POut << " volatile"; 464 RefQualifierKind Ref = MD->getRefQualifier(); 465 if (Ref == RQ_LValue) 466 POut << " &"; 467 else if (Ref == RQ_RValue) 468 POut << " &&"; 469 } 470 471 typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy; 472 SpecsTy Specs; 473 const DeclContext *Ctx = FD->getDeclContext(); 474 while (Ctx && isa<NamedDecl>(Ctx)) { 475 const ClassTemplateSpecializationDecl *Spec 476 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx); 477 if (Spec && !Spec->isExplicitSpecialization()) 478 Specs.push_back(Spec); 479 Ctx = Ctx->getParent(); 480 } 481 482 std::string TemplateParams; 483 llvm::raw_string_ostream TOut(TemplateParams); 484 for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend(); 485 I != E; ++I) { 486 const TemplateParameterList *Params 487 = (*I)->getSpecializedTemplate()->getTemplateParameters(); 488 const TemplateArgumentList &Args = (*I)->getTemplateArgs(); 489 assert(Params->size() == Args.size()); 490 for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) { 491 StringRef Param = Params->getParam(i)->getName(); 492 if (Param.empty()) continue; 493 TOut << Param << " = "; 494 Args.get(i).print(Policy, TOut); 495 TOut << ", "; 496 } 497 } 498 499 FunctionTemplateSpecializationInfo *FSI 500 = FD->getTemplateSpecializationInfo(); 501 if (FSI && !FSI->isExplicitSpecialization()) { 502 const TemplateParameterList* Params 503 = FSI->getTemplate()->getTemplateParameters(); 504 const TemplateArgumentList* Args = FSI->TemplateArguments; 505 assert(Params->size() == Args->size()); 506 for (unsigned i = 0, e = Params->size(); i != e; ++i) { 507 StringRef Param = Params->getParam(i)->getName(); 508 if (Param.empty()) continue; 509 TOut << Param << " = "; 510 Args->get(i).print(Policy, TOut); 511 TOut << ", "; 512 } 513 } 514 515 TOut.flush(); 516 if (!TemplateParams.empty()) { 517 // remove the trailing comma and space 518 TemplateParams.resize(TemplateParams.size() - 2); 519 POut << " [" << TemplateParams << "]"; 520 } 521 522 POut.flush(); 523 524 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 525 AFT->getResultType().getAsStringInternal(Proto, Policy); 526 527 Out << Proto; 528 529 Out.flush(); 530 return Name.str().str(); 531 } 532 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 533 SmallString<256> Name; 534 llvm::raw_svector_ostream Out(Name); 535 Out << (MD->isInstanceMethod() ? '-' : '+'); 536 Out << '['; 537 538 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 539 // a null check to avoid a crash. 540 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 541 Out << *ID; 542 543 if (const ObjCCategoryImplDecl *CID = 544 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 545 Out << '(' << *CID << ')'; 546 547 Out << ' '; 548 Out << MD->getSelector().getAsString(); 549 Out << ']'; 550 551 Out.flush(); 552 return Name.str().str(); 553 } 554 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 555 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 556 return "top level"; 557 } 558 return ""; 559} 560 561void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 562 if (hasAllocation()) 563 C.Deallocate(pVal); 564 565 BitWidth = Val.getBitWidth(); 566 unsigned NumWords = Val.getNumWords(); 567 const uint64_t* Words = Val.getRawData(); 568 if (NumWords > 1) { 569 pVal = new (C) uint64_t[NumWords]; 570 std::copy(Words, Words + NumWords, pVal); 571 } else if (NumWords == 1) 572 VAL = Words[0]; 573 else 574 VAL = 0; 575} 576 577IntegerLiteral * 578IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 579 QualType type, SourceLocation l) { 580 return new (C) IntegerLiteral(C, V, type, l); 581} 582 583IntegerLiteral * 584IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 585 return new (C) IntegerLiteral(Empty); 586} 587 588FloatingLiteral * 589FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 590 bool isexact, QualType Type, SourceLocation L) { 591 return new (C) FloatingLiteral(C, V, isexact, Type, L); 592} 593 594FloatingLiteral * 595FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 596 return new (C) FloatingLiteral(C, Empty); 597} 598 599/// getValueAsApproximateDouble - This returns the value as an inaccurate 600/// double. Note that this may cause loss of precision, but is useful for 601/// debugging dumps, etc. 602double FloatingLiteral::getValueAsApproximateDouble() const { 603 llvm::APFloat V = getValue(); 604 bool ignored; 605 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 606 &ignored); 607 return V.convertToDouble(); 608} 609 610int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) { 611 int CharByteWidth = 0; 612 switch(k) { 613 case Ascii: 614 case UTF8: 615 CharByteWidth = target.getCharWidth(); 616 break; 617 case Wide: 618 CharByteWidth = target.getWCharWidth(); 619 break; 620 case UTF16: 621 CharByteWidth = target.getChar16Width(); 622 break; 623 case UTF32: 624 CharByteWidth = target.getChar32Width(); 625 break; 626 } 627 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 628 CharByteWidth /= 8; 629 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 630 && "character byte widths supported are 1, 2, and 4 only"); 631 return CharByteWidth; 632} 633 634StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str, 635 StringKind Kind, bool Pascal, QualType Ty, 636 const SourceLocation *Loc, 637 unsigned NumStrs) { 638 // Allocate enough space for the StringLiteral plus an array of locations for 639 // any concatenated string tokens. 640 void *Mem = C.Allocate(sizeof(StringLiteral)+ 641 sizeof(SourceLocation)*(NumStrs-1), 642 llvm::alignOf<StringLiteral>()); 643 StringLiteral *SL = new (Mem) StringLiteral(Ty); 644 645 // OPTIMIZE: could allocate this appended to the StringLiteral. 646 SL->setString(C,Str,Kind,Pascal); 647 648 SL->TokLocs[0] = Loc[0]; 649 SL->NumConcatenated = NumStrs; 650 651 if (NumStrs != 1) 652 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 653 return SL; 654} 655 656StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 657 void *Mem = C.Allocate(sizeof(StringLiteral)+ 658 sizeof(SourceLocation)*(NumStrs-1), 659 llvm::alignOf<StringLiteral>()); 660 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 661 SL->CharByteWidth = 0; 662 SL->Length = 0; 663 SL->NumConcatenated = NumStrs; 664 return SL; 665} 666 667void StringLiteral::outputString(raw_ostream &OS) { 668 switch (getKind()) { 669 case Ascii: break; // no prefix. 670 case Wide: OS << 'L'; break; 671 case UTF8: OS << "u8"; break; 672 case UTF16: OS << 'u'; break; 673 case UTF32: OS << 'U'; break; 674 } 675 OS << '"'; 676 static const char Hex[] = "0123456789ABCDEF"; 677 678 unsigned LastSlashX = getLength(); 679 for (unsigned I = 0, N = getLength(); I != N; ++I) { 680 switch (uint32_t Char = getCodeUnit(I)) { 681 default: 682 // FIXME: Convert UTF-8 back to codepoints before rendering. 683 684 // Convert UTF-16 surrogate pairs back to codepoints before rendering. 685 // Leave invalid surrogates alone; we'll use \x for those. 686 if (getKind() == UTF16 && I != N - 1 && Char >= 0xd800 && 687 Char <= 0xdbff) { 688 uint32_t Trail = getCodeUnit(I + 1); 689 if (Trail >= 0xdc00 && Trail <= 0xdfff) { 690 Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00); 691 ++I; 692 } 693 } 694 695 if (Char > 0xff) { 696 // If this is a wide string, output characters over 0xff using \x 697 // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a 698 // codepoint: use \x escapes for invalid codepoints. 699 if (getKind() == Wide || 700 (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) { 701 // FIXME: Is this the best way to print wchar_t? 702 OS << "\\x"; 703 int Shift = 28; 704 while ((Char >> Shift) == 0) 705 Shift -= 4; 706 for (/**/; Shift >= 0; Shift -= 4) 707 OS << Hex[(Char >> Shift) & 15]; 708 LastSlashX = I; 709 break; 710 } 711 712 if (Char > 0xffff) 713 OS << "\\U00" 714 << Hex[(Char >> 20) & 15] 715 << Hex[(Char >> 16) & 15]; 716 else 717 OS << "\\u"; 718 OS << Hex[(Char >> 12) & 15] 719 << Hex[(Char >> 8) & 15] 720 << Hex[(Char >> 4) & 15] 721 << Hex[(Char >> 0) & 15]; 722 break; 723 } 724 725 // If we used \x... for the previous character, and this character is a 726 // hexadecimal digit, prevent it being slurped as part of the \x. 727 if (LastSlashX + 1 == I) { 728 switch (Char) { 729 case '0': case '1': case '2': case '3': case '4': 730 case '5': case '6': case '7': case '8': case '9': 731 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': 732 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': 733 OS << "\"\""; 734 } 735 } 736 737 assert(Char <= 0xff && 738 "Characters above 0xff should already have been handled."); 739 740 if (isprint(Char)) 741 OS << (char)Char; 742 else // Output anything hard as an octal escape. 743 OS << '\\' 744 << (char)('0' + ((Char >> 6) & 7)) 745 << (char)('0' + ((Char >> 3) & 7)) 746 << (char)('0' + ((Char >> 0) & 7)); 747 break; 748 // Handle some common non-printable cases to make dumps prettier. 749 case '\\': OS << "\\\\"; break; 750 case '"': OS << "\\\""; break; 751 case '\n': OS << "\\n"; break; 752 case '\t': OS << "\\t"; break; 753 case '\a': OS << "\\a"; break; 754 case '\b': OS << "\\b"; break; 755 } 756 } 757 OS << '"'; 758} 759 760void StringLiteral::setString(ASTContext &C, StringRef Str, 761 StringKind Kind, bool IsPascal) { 762 //FIXME: we assume that the string data comes from a target that uses the same 763 // code unit size and endianess for the type of string. 764 this->Kind = Kind; 765 this->IsPascal = IsPascal; 766 767 CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind); 768 assert((Str.size()%CharByteWidth == 0) 769 && "size of data must be multiple of CharByteWidth"); 770 Length = Str.size()/CharByteWidth; 771 772 switch(CharByteWidth) { 773 case 1: { 774 char *AStrData = new (C) char[Length]; 775 std::memcpy(AStrData,Str.data(),Str.size()); 776 StrData.asChar = AStrData; 777 break; 778 } 779 case 2: { 780 uint16_t *AStrData = new (C) uint16_t[Length]; 781 std::memcpy(AStrData,Str.data(),Str.size()); 782 StrData.asUInt16 = AStrData; 783 break; 784 } 785 case 4: { 786 uint32_t *AStrData = new (C) uint32_t[Length]; 787 std::memcpy(AStrData,Str.data(),Str.size()); 788 StrData.asUInt32 = AStrData; 789 break; 790 } 791 default: 792 assert(false && "unsupported CharByteWidth"); 793 } 794} 795 796/// getLocationOfByte - Return a source location that points to the specified 797/// byte of this string literal. 798/// 799/// Strings are amazingly complex. They can be formed from multiple tokens and 800/// can have escape sequences in them in addition to the usual trigraph and 801/// escaped newline business. This routine handles this complexity. 802/// 803SourceLocation StringLiteral:: 804getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 805 const LangOptions &Features, const TargetInfo &Target) const { 806 assert((Kind == StringLiteral::Ascii || Kind == StringLiteral::UTF8) && 807 "Only narrow string literals are currently supported"); 808 809 // Loop over all of the tokens in this string until we find the one that 810 // contains the byte we're looking for. 811 unsigned TokNo = 0; 812 while (1) { 813 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 814 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 815 816 // Get the spelling of the string so that we can get the data that makes up 817 // the string literal, not the identifier for the macro it is potentially 818 // expanded through. 819 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 820 821 // Re-lex the token to get its length and original spelling. 822 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 823 bool Invalid = false; 824 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 825 if (Invalid) 826 return StrTokSpellingLoc; 827 828 const char *StrData = Buffer.data()+LocInfo.second; 829 830 // Create a lexer starting at the beginning of this token. 831 Lexer TheLexer(SM.getLocForStartOfFile(LocInfo.first), Features, 832 Buffer.begin(), StrData, Buffer.end()); 833 Token TheTok; 834 TheLexer.LexFromRawLexer(TheTok); 835 836 // Use the StringLiteralParser to compute the length of the string in bytes. 837 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 838 unsigned TokNumBytes = SLP.GetStringLength(); 839 840 // If the byte is in this token, return the location of the byte. 841 if (ByteNo < TokNumBytes || 842 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) { 843 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 844 845 // Now that we know the offset of the token in the spelling, use the 846 // preprocessor to get the offset in the original source. 847 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 848 } 849 850 // Move to the next string token. 851 ++TokNo; 852 ByteNo -= TokNumBytes; 853 } 854} 855 856 857 858/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 859/// corresponds to, e.g. "sizeof" or "[pre]++". 860const char *UnaryOperator::getOpcodeStr(Opcode Op) { 861 switch (Op) { 862 case UO_PostInc: return "++"; 863 case UO_PostDec: return "--"; 864 case UO_PreInc: return "++"; 865 case UO_PreDec: return "--"; 866 case UO_AddrOf: return "&"; 867 case UO_Deref: return "*"; 868 case UO_Plus: return "+"; 869 case UO_Minus: return "-"; 870 case UO_Not: return "~"; 871 case UO_LNot: return "!"; 872 case UO_Real: return "__real"; 873 case UO_Imag: return "__imag"; 874 case UO_Extension: return "__extension__"; 875 } 876 llvm_unreachable("Unknown unary operator"); 877} 878 879UnaryOperatorKind 880UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 881 switch (OO) { 882 default: llvm_unreachable("No unary operator for overloaded function"); 883 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 884 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 885 case OO_Amp: return UO_AddrOf; 886 case OO_Star: return UO_Deref; 887 case OO_Plus: return UO_Plus; 888 case OO_Minus: return UO_Minus; 889 case OO_Tilde: return UO_Not; 890 case OO_Exclaim: return UO_LNot; 891 } 892} 893 894OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 895 switch (Opc) { 896 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 897 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 898 case UO_AddrOf: return OO_Amp; 899 case UO_Deref: return OO_Star; 900 case UO_Plus: return OO_Plus; 901 case UO_Minus: return OO_Minus; 902 case UO_Not: return OO_Tilde; 903 case UO_LNot: return OO_Exclaim; 904 default: return OO_None; 905 } 906} 907 908 909//===----------------------------------------------------------------------===// 910// Postfix Operators. 911//===----------------------------------------------------------------------===// 912 913CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 914 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 915 SourceLocation rparenloc) 916 : Expr(SC, t, VK, OK_Ordinary, 917 fn->isTypeDependent(), 918 fn->isValueDependent(), 919 fn->isInstantiationDependent(), 920 fn->containsUnexpandedParameterPack()), 921 NumArgs(numargs) { 922 923 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs]; 924 SubExprs[FN] = fn; 925 for (unsigned i = 0; i != numargs; ++i) { 926 if (args[i]->isTypeDependent()) 927 ExprBits.TypeDependent = true; 928 if (args[i]->isValueDependent()) 929 ExprBits.ValueDependent = true; 930 if (args[i]->isInstantiationDependent()) 931 ExprBits.InstantiationDependent = true; 932 if (args[i]->containsUnexpandedParameterPack()) 933 ExprBits.ContainsUnexpandedParameterPack = true; 934 935 SubExprs[i+PREARGS_START+NumPreArgs] = args[i]; 936 } 937 938 CallExprBits.NumPreArgs = NumPreArgs; 939 RParenLoc = rparenloc; 940} 941 942CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 943 QualType t, ExprValueKind VK, SourceLocation rparenloc) 944 : Expr(CallExprClass, t, VK, OK_Ordinary, 945 fn->isTypeDependent(), 946 fn->isValueDependent(), 947 fn->isInstantiationDependent(), 948 fn->containsUnexpandedParameterPack()), 949 NumArgs(numargs) { 950 951 SubExprs = new (C) Stmt*[numargs+PREARGS_START]; 952 SubExprs[FN] = fn; 953 for (unsigned i = 0; i != numargs; ++i) { 954 if (args[i]->isTypeDependent()) 955 ExprBits.TypeDependent = true; 956 if (args[i]->isValueDependent()) 957 ExprBits.ValueDependent = true; 958 if (args[i]->isInstantiationDependent()) 959 ExprBits.InstantiationDependent = true; 960 if (args[i]->containsUnexpandedParameterPack()) 961 ExprBits.ContainsUnexpandedParameterPack = true; 962 963 SubExprs[i+PREARGS_START] = args[i]; 964 } 965 966 CallExprBits.NumPreArgs = 0; 967 RParenLoc = rparenloc; 968} 969 970CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 971 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 972 // FIXME: Why do we allocate this? 973 SubExprs = new (C) Stmt*[PREARGS_START]; 974 CallExprBits.NumPreArgs = 0; 975} 976 977CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, 978 EmptyShell Empty) 979 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 980 // FIXME: Why do we allocate this? 981 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]; 982 CallExprBits.NumPreArgs = NumPreArgs; 983} 984 985Decl *CallExpr::getCalleeDecl() { 986 Expr *CEE = getCallee()->IgnoreParenImpCasts(); 987 988 while (SubstNonTypeTemplateParmExpr *NTTP 989 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) { 990 CEE = NTTP->getReplacement()->IgnoreParenCasts(); 991 } 992 993 // If we're calling a dereference, look at the pointer instead. 994 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 995 if (BO->isPtrMemOp()) 996 CEE = BO->getRHS()->IgnoreParenCasts(); 997 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 998 if (UO->getOpcode() == UO_Deref) 999 CEE = UO->getSubExpr()->IgnoreParenCasts(); 1000 } 1001 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 1002 return DRE->getDecl(); 1003 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 1004 return ME->getMemberDecl(); 1005 1006 return 0; 1007} 1008 1009FunctionDecl *CallExpr::getDirectCallee() { 1010 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 1011} 1012 1013/// setNumArgs - This changes the number of arguments present in this call. 1014/// Any orphaned expressions are deleted by this, and any new operands are set 1015/// to null. 1016void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 1017 // No change, just return. 1018 if (NumArgs == getNumArgs()) return; 1019 1020 // If shrinking # arguments, just delete the extras and forgot them. 1021 if (NumArgs < getNumArgs()) { 1022 this->NumArgs = NumArgs; 1023 return; 1024 } 1025 1026 // Otherwise, we are growing the # arguments. New an bigger argument array. 1027 unsigned NumPreArgs = getNumPreArgs(); 1028 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs]; 1029 // Copy over args. 1030 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i) 1031 NewSubExprs[i] = SubExprs[i]; 1032 // Null out new args. 1033 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs; 1034 i != NumArgs+PREARGS_START+NumPreArgs; ++i) 1035 NewSubExprs[i] = 0; 1036 1037 if (SubExprs) C.Deallocate(SubExprs); 1038 SubExprs = NewSubExprs; 1039 this->NumArgs = NumArgs; 1040} 1041 1042/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1043/// not, return 0. 1044unsigned CallExpr::isBuiltinCall() const { 1045 // All simple function calls (e.g. func()) are implicitly cast to pointer to 1046 // function. As a result, we try and obtain the DeclRefExpr from the 1047 // ImplicitCastExpr. 1048 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 1049 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 1050 return 0; 1051 1052 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 1053 if (!DRE) 1054 return 0; 1055 1056 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 1057 if (!FDecl) 1058 return 0; 1059 1060 if (!FDecl->getIdentifier()) 1061 return 0; 1062 1063 return FDecl->getBuiltinID(); 1064} 1065 1066QualType CallExpr::getCallReturnType() const { 1067 QualType CalleeType = getCallee()->getType(); 1068 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 1069 CalleeType = FnTypePtr->getPointeeType(); 1070 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 1071 CalleeType = BPT->getPointeeType(); 1072 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) 1073 // This should never be overloaded and so should never return null. 1074 CalleeType = Expr::findBoundMemberType(getCallee()); 1075 1076 const FunctionType *FnType = CalleeType->castAs<FunctionType>(); 1077 return FnType->getResultType(); 1078} 1079 1080SourceRange CallExpr::getSourceRange() const { 1081 if (isa<CXXOperatorCallExpr>(this)) 1082 return cast<CXXOperatorCallExpr>(this)->getSourceRange(); 1083 1084 SourceLocation begin = getCallee()->getLocStart(); 1085 if (begin.isInvalid() && getNumArgs() > 0) 1086 begin = getArg(0)->getLocStart(); 1087 SourceLocation end = getRParenLoc(); 1088 if (end.isInvalid() && getNumArgs() > 0) 1089 end = getArg(getNumArgs() - 1)->getLocEnd(); 1090 return SourceRange(begin, end); 1091} 1092SourceLocation CallExpr::getLocStart() const { 1093 if (isa<CXXOperatorCallExpr>(this)) 1094 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getBegin(); 1095 1096 SourceLocation begin = getCallee()->getLocStart(); 1097 if (begin.isInvalid() && getNumArgs() > 0) 1098 begin = getArg(0)->getLocStart(); 1099 return begin; 1100} 1101SourceLocation CallExpr::getLocEnd() const { 1102 if (isa<CXXOperatorCallExpr>(this)) 1103 return cast<CXXOperatorCallExpr>(this)->getSourceRange().getEnd(); 1104 1105 SourceLocation end = getRParenLoc(); 1106 if (end.isInvalid() && getNumArgs() > 0) 1107 end = getArg(getNumArgs() - 1)->getLocEnd(); 1108 return end; 1109} 1110 1111OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 1112 SourceLocation OperatorLoc, 1113 TypeSourceInfo *tsi, 1114 OffsetOfNode* compsPtr, unsigned numComps, 1115 Expr** exprsPtr, unsigned numExprs, 1116 SourceLocation RParenLoc) { 1117 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 1118 sizeof(OffsetOfNode) * numComps + 1119 sizeof(Expr*) * numExprs); 1120 1121 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 1122 exprsPtr, numExprs, RParenLoc); 1123} 1124 1125OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 1126 unsigned numComps, unsigned numExprs) { 1127 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 1128 sizeof(OffsetOfNode) * numComps + 1129 sizeof(Expr*) * numExprs); 1130 return new (Mem) OffsetOfExpr(numComps, numExprs); 1131} 1132 1133OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 1134 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1135 OffsetOfNode* compsPtr, unsigned numComps, 1136 Expr** exprsPtr, unsigned numExprs, 1137 SourceLocation RParenLoc) 1138 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 1139 /*TypeDependent=*/false, 1140 /*ValueDependent=*/tsi->getType()->isDependentType(), 1141 tsi->getType()->isInstantiationDependentType(), 1142 tsi->getType()->containsUnexpandedParameterPack()), 1143 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 1144 NumComps(numComps), NumExprs(numExprs) 1145{ 1146 for(unsigned i = 0; i < numComps; ++i) { 1147 setComponent(i, compsPtr[i]); 1148 } 1149 1150 for(unsigned i = 0; i < numExprs; ++i) { 1151 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent()) 1152 ExprBits.ValueDependent = true; 1153 if (exprsPtr[i]->containsUnexpandedParameterPack()) 1154 ExprBits.ContainsUnexpandedParameterPack = true; 1155 1156 setIndexExpr(i, exprsPtr[i]); 1157 } 1158} 1159 1160IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 1161 assert(getKind() == Field || getKind() == Identifier); 1162 if (getKind() == Field) 1163 return getField()->getIdentifier(); 1164 1165 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 1166} 1167 1168MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 1169 NestedNameSpecifierLoc QualifierLoc, 1170 SourceLocation TemplateKWLoc, 1171 ValueDecl *memberdecl, 1172 DeclAccessPair founddecl, 1173 DeclarationNameInfo nameinfo, 1174 const TemplateArgumentListInfo *targs, 1175 QualType ty, 1176 ExprValueKind vk, 1177 ExprObjectKind ok) { 1178 std::size_t Size = sizeof(MemberExpr); 1179 1180 bool hasQualOrFound = (QualifierLoc || 1181 founddecl.getDecl() != memberdecl || 1182 founddecl.getAccess() != memberdecl->getAccess()); 1183 if (hasQualOrFound) 1184 Size += sizeof(MemberNameQualifier); 1185 1186 if (targs) 1187 Size += ASTTemplateKWAndArgsInfo::sizeFor(targs->size()); 1188 else if (TemplateKWLoc.isValid()) 1189 Size += ASTTemplateKWAndArgsInfo::sizeFor(0); 1190 1191 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 1192 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 1193 ty, vk, ok); 1194 1195 if (hasQualOrFound) { 1196 // FIXME: Wrong. We should be looking at the member declaration we found. 1197 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) { 1198 E->setValueDependent(true); 1199 E->setTypeDependent(true); 1200 E->setInstantiationDependent(true); 1201 } 1202 else if (QualifierLoc && 1203 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent()) 1204 E->setInstantiationDependent(true); 1205 1206 E->HasQualifierOrFoundDecl = true; 1207 1208 MemberNameQualifier *NQ = E->getMemberQualifier(); 1209 NQ->QualifierLoc = QualifierLoc; 1210 NQ->FoundDecl = founddecl; 1211 } 1212 1213 E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid()); 1214 1215 if (targs) { 1216 bool Dependent = false; 1217 bool InstantiationDependent = false; 1218 bool ContainsUnexpandedParameterPack = false; 1219 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *targs, 1220 Dependent, 1221 InstantiationDependent, 1222 ContainsUnexpandedParameterPack); 1223 if (InstantiationDependent) 1224 E->setInstantiationDependent(true); 1225 } else if (TemplateKWLoc.isValid()) { 1226 E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc); 1227 } 1228 1229 return E; 1230} 1231 1232SourceRange MemberExpr::getSourceRange() const { 1233 return SourceRange(getLocStart(), getLocEnd()); 1234} 1235SourceLocation MemberExpr::getLocStart() const { 1236 if (isImplicitAccess()) { 1237 if (hasQualifier()) 1238 return getQualifierLoc().getBeginLoc(); 1239 return MemberLoc; 1240 } 1241 1242 // FIXME: We don't want this to happen. Rather, we should be able to 1243 // detect all kinds of implicit accesses more cleanly. 1244 SourceLocation BaseStartLoc = getBase()->getLocStart(); 1245 if (BaseStartLoc.isValid()) 1246 return BaseStartLoc; 1247 return MemberLoc; 1248} 1249SourceLocation MemberExpr::getLocEnd() const { 1250 if (hasExplicitTemplateArgs()) 1251 return getRAngleLoc(); 1252 return getMemberNameInfo().getEndLoc(); 1253} 1254 1255void CastExpr::CheckCastConsistency() const { 1256 switch (getCastKind()) { 1257 case CK_DerivedToBase: 1258 case CK_UncheckedDerivedToBase: 1259 case CK_DerivedToBaseMemberPointer: 1260 case CK_BaseToDerived: 1261 case CK_BaseToDerivedMemberPointer: 1262 assert(!path_empty() && "Cast kind should have a base path!"); 1263 break; 1264 1265 case CK_CPointerToObjCPointerCast: 1266 assert(getType()->isObjCObjectPointerType()); 1267 assert(getSubExpr()->getType()->isPointerType()); 1268 goto CheckNoBasePath; 1269 1270 case CK_BlockPointerToObjCPointerCast: 1271 assert(getType()->isObjCObjectPointerType()); 1272 assert(getSubExpr()->getType()->isBlockPointerType()); 1273 goto CheckNoBasePath; 1274 1275 case CK_ReinterpretMemberPointer: 1276 assert(getType()->isMemberPointerType()); 1277 assert(getSubExpr()->getType()->isMemberPointerType()); 1278 goto CheckNoBasePath; 1279 1280 case CK_BitCast: 1281 // Arbitrary casts to C pointer types count as bitcasts. 1282 // Otherwise, we should only have block and ObjC pointer casts 1283 // here if they stay within the type kind. 1284 if (!getType()->isPointerType()) { 1285 assert(getType()->isObjCObjectPointerType() == 1286 getSubExpr()->getType()->isObjCObjectPointerType()); 1287 assert(getType()->isBlockPointerType() == 1288 getSubExpr()->getType()->isBlockPointerType()); 1289 } 1290 goto CheckNoBasePath; 1291 1292 case CK_AnyPointerToBlockPointerCast: 1293 assert(getType()->isBlockPointerType()); 1294 assert(getSubExpr()->getType()->isAnyPointerType() && 1295 !getSubExpr()->getType()->isBlockPointerType()); 1296 goto CheckNoBasePath; 1297 1298 case CK_CopyAndAutoreleaseBlockObject: 1299 assert(getType()->isBlockPointerType()); 1300 assert(getSubExpr()->getType()->isBlockPointerType()); 1301 goto CheckNoBasePath; 1302 1303 // These should not have an inheritance path. 1304 case CK_Dynamic: 1305 case CK_ToUnion: 1306 case CK_ArrayToPointerDecay: 1307 case CK_FunctionToPointerDecay: 1308 case CK_NullToMemberPointer: 1309 case CK_NullToPointer: 1310 case CK_ConstructorConversion: 1311 case CK_IntegralToPointer: 1312 case CK_PointerToIntegral: 1313 case CK_ToVoid: 1314 case CK_VectorSplat: 1315 case CK_IntegralCast: 1316 case CK_IntegralToFloating: 1317 case CK_FloatingToIntegral: 1318 case CK_FloatingCast: 1319 case CK_ObjCObjectLValueCast: 1320 case CK_FloatingRealToComplex: 1321 case CK_FloatingComplexToReal: 1322 case CK_FloatingComplexCast: 1323 case CK_FloatingComplexToIntegralComplex: 1324 case CK_IntegralRealToComplex: 1325 case CK_IntegralComplexToReal: 1326 case CK_IntegralComplexCast: 1327 case CK_IntegralComplexToFloatingComplex: 1328 case CK_ARCProduceObject: 1329 case CK_ARCConsumeObject: 1330 case CK_ARCReclaimReturnedObject: 1331 case CK_ARCExtendBlockObject: 1332 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 1333 goto CheckNoBasePath; 1334 1335 case CK_Dependent: 1336 case CK_LValueToRValue: 1337 case CK_NoOp: 1338 case CK_AtomicToNonAtomic: 1339 case CK_NonAtomicToAtomic: 1340 case CK_PointerToBoolean: 1341 case CK_IntegralToBoolean: 1342 case CK_FloatingToBoolean: 1343 case CK_MemberPointerToBoolean: 1344 case CK_FloatingComplexToBoolean: 1345 case CK_IntegralComplexToBoolean: 1346 case CK_LValueBitCast: // -> bool& 1347 case CK_UserDefinedConversion: // operator bool() 1348 CheckNoBasePath: 1349 assert(path_empty() && "Cast kind should not have a base path!"); 1350 break; 1351 } 1352} 1353 1354const char *CastExpr::getCastKindName() const { 1355 switch (getCastKind()) { 1356 case CK_Dependent: 1357 return "Dependent"; 1358 case CK_BitCast: 1359 return "BitCast"; 1360 case CK_LValueBitCast: 1361 return "LValueBitCast"; 1362 case CK_LValueToRValue: 1363 return "LValueToRValue"; 1364 case CK_NoOp: 1365 return "NoOp"; 1366 case CK_BaseToDerived: 1367 return "BaseToDerived"; 1368 case CK_DerivedToBase: 1369 return "DerivedToBase"; 1370 case CK_UncheckedDerivedToBase: 1371 return "UncheckedDerivedToBase"; 1372 case CK_Dynamic: 1373 return "Dynamic"; 1374 case CK_ToUnion: 1375 return "ToUnion"; 1376 case CK_ArrayToPointerDecay: 1377 return "ArrayToPointerDecay"; 1378 case CK_FunctionToPointerDecay: 1379 return "FunctionToPointerDecay"; 1380 case CK_NullToMemberPointer: 1381 return "NullToMemberPointer"; 1382 case CK_NullToPointer: 1383 return "NullToPointer"; 1384 case CK_BaseToDerivedMemberPointer: 1385 return "BaseToDerivedMemberPointer"; 1386 case CK_DerivedToBaseMemberPointer: 1387 return "DerivedToBaseMemberPointer"; 1388 case CK_ReinterpretMemberPointer: 1389 return "ReinterpretMemberPointer"; 1390 case CK_UserDefinedConversion: 1391 return "UserDefinedConversion"; 1392 case CK_ConstructorConversion: 1393 return "ConstructorConversion"; 1394 case CK_IntegralToPointer: 1395 return "IntegralToPointer"; 1396 case CK_PointerToIntegral: 1397 return "PointerToIntegral"; 1398 case CK_PointerToBoolean: 1399 return "PointerToBoolean"; 1400 case CK_ToVoid: 1401 return "ToVoid"; 1402 case CK_VectorSplat: 1403 return "VectorSplat"; 1404 case CK_IntegralCast: 1405 return "IntegralCast"; 1406 case CK_IntegralToBoolean: 1407 return "IntegralToBoolean"; 1408 case CK_IntegralToFloating: 1409 return "IntegralToFloating"; 1410 case CK_FloatingToIntegral: 1411 return "FloatingToIntegral"; 1412 case CK_FloatingCast: 1413 return "FloatingCast"; 1414 case CK_FloatingToBoolean: 1415 return "FloatingToBoolean"; 1416 case CK_MemberPointerToBoolean: 1417 return "MemberPointerToBoolean"; 1418 case CK_CPointerToObjCPointerCast: 1419 return "CPointerToObjCPointerCast"; 1420 case CK_BlockPointerToObjCPointerCast: 1421 return "BlockPointerToObjCPointerCast"; 1422 case CK_AnyPointerToBlockPointerCast: 1423 return "AnyPointerToBlockPointerCast"; 1424 case CK_ObjCObjectLValueCast: 1425 return "ObjCObjectLValueCast"; 1426 case CK_FloatingRealToComplex: 1427 return "FloatingRealToComplex"; 1428 case CK_FloatingComplexToReal: 1429 return "FloatingComplexToReal"; 1430 case CK_FloatingComplexToBoolean: 1431 return "FloatingComplexToBoolean"; 1432 case CK_FloatingComplexCast: 1433 return "FloatingComplexCast"; 1434 case CK_FloatingComplexToIntegralComplex: 1435 return "FloatingComplexToIntegralComplex"; 1436 case CK_IntegralRealToComplex: 1437 return "IntegralRealToComplex"; 1438 case CK_IntegralComplexToReal: 1439 return "IntegralComplexToReal"; 1440 case CK_IntegralComplexToBoolean: 1441 return "IntegralComplexToBoolean"; 1442 case CK_IntegralComplexCast: 1443 return "IntegralComplexCast"; 1444 case CK_IntegralComplexToFloatingComplex: 1445 return "IntegralComplexToFloatingComplex"; 1446 case CK_ARCConsumeObject: 1447 return "ARCConsumeObject"; 1448 case CK_ARCProduceObject: 1449 return "ARCProduceObject"; 1450 case CK_ARCReclaimReturnedObject: 1451 return "ARCReclaimReturnedObject"; 1452 case CK_ARCExtendBlockObject: 1453 return "ARCCExtendBlockObject"; 1454 case CK_AtomicToNonAtomic: 1455 return "AtomicToNonAtomic"; 1456 case CK_NonAtomicToAtomic: 1457 return "NonAtomicToAtomic"; 1458 case CK_CopyAndAutoreleaseBlockObject: 1459 return "CopyAndAutoreleaseBlockObject"; 1460 } 1461 1462 llvm_unreachable("Unhandled cast kind!"); 1463} 1464 1465Expr *CastExpr::getSubExprAsWritten() { 1466 Expr *SubExpr = 0; 1467 CastExpr *E = this; 1468 do { 1469 SubExpr = E->getSubExpr(); 1470 1471 // Skip through reference binding to temporary. 1472 if (MaterializeTemporaryExpr *Materialize 1473 = dyn_cast<MaterializeTemporaryExpr>(SubExpr)) 1474 SubExpr = Materialize->GetTemporaryExpr(); 1475 1476 // Skip any temporary bindings; they're implicit. 1477 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 1478 SubExpr = Binder->getSubExpr(); 1479 1480 // Conversions by constructor and conversion functions have a 1481 // subexpression describing the call; strip it off. 1482 if (E->getCastKind() == CK_ConstructorConversion) 1483 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 1484 else if (E->getCastKind() == CK_UserDefinedConversion) 1485 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 1486 1487 // If the subexpression we're left with is an implicit cast, look 1488 // through that, too. 1489 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 1490 1491 return SubExpr; 1492} 1493 1494CXXBaseSpecifier **CastExpr::path_buffer() { 1495 switch (getStmtClass()) { 1496#define ABSTRACT_STMT(x) 1497#define CASTEXPR(Type, Base) \ 1498 case Stmt::Type##Class: \ 1499 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 1500#define STMT(Type, Base) 1501#include "clang/AST/StmtNodes.inc" 1502 default: 1503 llvm_unreachable("non-cast expressions not possible here"); 1504 } 1505} 1506 1507void CastExpr::setCastPath(const CXXCastPath &Path) { 1508 assert(Path.size() == path_size()); 1509 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 1510} 1511 1512ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 1513 CastKind Kind, Expr *Operand, 1514 const CXXCastPath *BasePath, 1515 ExprValueKind VK) { 1516 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1517 void *Buffer = 1518 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1519 ImplicitCastExpr *E = 1520 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 1521 if (PathSize) E->setCastPath(*BasePath); 1522 return E; 1523} 1524 1525ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 1526 unsigned PathSize) { 1527 void *Buffer = 1528 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1529 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 1530} 1531 1532 1533CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 1534 ExprValueKind VK, CastKind K, Expr *Op, 1535 const CXXCastPath *BasePath, 1536 TypeSourceInfo *WrittenTy, 1537 SourceLocation L, SourceLocation R) { 1538 unsigned PathSize = (BasePath ? BasePath->size() : 0); 1539 void *Buffer = 1540 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1541 CStyleCastExpr *E = 1542 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 1543 if (PathSize) E->setCastPath(*BasePath); 1544 return E; 1545} 1546 1547CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 1548 void *Buffer = 1549 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 1550 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 1551} 1552 1553/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1554/// corresponds to, e.g. "<<=". 1555const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1556 switch (Op) { 1557 case BO_PtrMemD: return ".*"; 1558 case BO_PtrMemI: return "->*"; 1559 case BO_Mul: return "*"; 1560 case BO_Div: return "/"; 1561 case BO_Rem: return "%"; 1562 case BO_Add: return "+"; 1563 case BO_Sub: return "-"; 1564 case BO_Shl: return "<<"; 1565 case BO_Shr: return ">>"; 1566 case BO_LT: return "<"; 1567 case BO_GT: return ">"; 1568 case BO_LE: return "<="; 1569 case BO_GE: return ">="; 1570 case BO_EQ: return "=="; 1571 case BO_NE: return "!="; 1572 case BO_And: return "&"; 1573 case BO_Xor: return "^"; 1574 case BO_Or: return "|"; 1575 case BO_LAnd: return "&&"; 1576 case BO_LOr: return "||"; 1577 case BO_Assign: return "="; 1578 case BO_MulAssign: return "*="; 1579 case BO_DivAssign: return "/="; 1580 case BO_RemAssign: return "%="; 1581 case BO_AddAssign: return "+="; 1582 case BO_SubAssign: return "-="; 1583 case BO_ShlAssign: return "<<="; 1584 case BO_ShrAssign: return ">>="; 1585 case BO_AndAssign: return "&="; 1586 case BO_XorAssign: return "^="; 1587 case BO_OrAssign: return "|="; 1588 case BO_Comma: return ","; 1589 } 1590 1591 llvm_unreachable("Invalid OpCode!"); 1592} 1593 1594BinaryOperatorKind 1595BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1596 switch (OO) { 1597 default: llvm_unreachable("Not an overloadable binary operator"); 1598 case OO_Plus: return BO_Add; 1599 case OO_Minus: return BO_Sub; 1600 case OO_Star: return BO_Mul; 1601 case OO_Slash: return BO_Div; 1602 case OO_Percent: return BO_Rem; 1603 case OO_Caret: return BO_Xor; 1604 case OO_Amp: return BO_And; 1605 case OO_Pipe: return BO_Or; 1606 case OO_Equal: return BO_Assign; 1607 case OO_Less: return BO_LT; 1608 case OO_Greater: return BO_GT; 1609 case OO_PlusEqual: return BO_AddAssign; 1610 case OO_MinusEqual: return BO_SubAssign; 1611 case OO_StarEqual: return BO_MulAssign; 1612 case OO_SlashEqual: return BO_DivAssign; 1613 case OO_PercentEqual: return BO_RemAssign; 1614 case OO_CaretEqual: return BO_XorAssign; 1615 case OO_AmpEqual: return BO_AndAssign; 1616 case OO_PipeEqual: return BO_OrAssign; 1617 case OO_LessLess: return BO_Shl; 1618 case OO_GreaterGreater: return BO_Shr; 1619 case OO_LessLessEqual: return BO_ShlAssign; 1620 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1621 case OO_EqualEqual: return BO_EQ; 1622 case OO_ExclaimEqual: return BO_NE; 1623 case OO_LessEqual: return BO_LE; 1624 case OO_GreaterEqual: return BO_GE; 1625 case OO_AmpAmp: return BO_LAnd; 1626 case OO_PipePipe: return BO_LOr; 1627 case OO_Comma: return BO_Comma; 1628 case OO_ArrowStar: return BO_PtrMemI; 1629 } 1630} 1631 1632OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1633 static const OverloadedOperatorKind OverOps[] = { 1634 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1635 OO_Star, OO_Slash, OO_Percent, 1636 OO_Plus, OO_Minus, 1637 OO_LessLess, OO_GreaterGreater, 1638 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1639 OO_EqualEqual, OO_ExclaimEqual, 1640 OO_Amp, 1641 OO_Caret, 1642 OO_Pipe, 1643 OO_AmpAmp, 1644 OO_PipePipe, 1645 OO_Equal, OO_StarEqual, 1646 OO_SlashEqual, OO_PercentEqual, 1647 OO_PlusEqual, OO_MinusEqual, 1648 OO_LessLessEqual, OO_GreaterGreaterEqual, 1649 OO_AmpEqual, OO_CaretEqual, 1650 OO_PipeEqual, 1651 OO_Comma 1652 }; 1653 return OverOps[Opc]; 1654} 1655 1656InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1657 Expr **initExprs, unsigned numInits, 1658 SourceLocation rbraceloc) 1659 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false, 1660 false, false), 1661 InitExprs(C, numInits), 1662 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0) 1663{ 1664 sawArrayRangeDesignator(false); 1665 setInitializesStdInitializerList(false); 1666 for (unsigned I = 0; I != numInits; ++I) { 1667 if (initExprs[I]->isTypeDependent()) 1668 ExprBits.TypeDependent = true; 1669 if (initExprs[I]->isValueDependent()) 1670 ExprBits.ValueDependent = true; 1671 if (initExprs[I]->isInstantiationDependent()) 1672 ExprBits.InstantiationDependent = true; 1673 if (initExprs[I]->containsUnexpandedParameterPack()) 1674 ExprBits.ContainsUnexpandedParameterPack = true; 1675 } 1676 1677 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1678} 1679 1680void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1681 if (NumInits > InitExprs.size()) 1682 InitExprs.reserve(C, NumInits); 1683} 1684 1685void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1686 InitExprs.resize(C, NumInits, 0); 1687} 1688 1689Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1690 if (Init >= InitExprs.size()) { 1691 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1692 InitExprs.back() = expr; 1693 return 0; 1694 } 1695 1696 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1697 InitExprs[Init] = expr; 1698 return Result; 1699} 1700 1701void InitListExpr::setArrayFiller(Expr *filler) { 1702 assert(!hasArrayFiller() && "Filler already set!"); 1703 ArrayFillerOrUnionFieldInit = filler; 1704 // Fill out any "holes" in the array due to designated initializers. 1705 Expr **inits = getInits(); 1706 for (unsigned i = 0, e = getNumInits(); i != e; ++i) 1707 if (inits[i] == 0) 1708 inits[i] = filler; 1709} 1710 1711bool InitListExpr::isStringLiteralInit() const { 1712 if (getNumInits() != 1) 1713 return false; 1714 const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(getType()); 1715 if (!CAT || !CAT->getElementType()->isIntegerType()) 1716 return false; 1717 const Expr *Init = getInit(0)->IgnoreParenImpCasts(); 1718 return isa<StringLiteral>(Init) || isa<ObjCEncodeExpr>(Init); 1719} 1720 1721SourceRange InitListExpr::getSourceRange() const { 1722 if (SyntacticForm) 1723 return SyntacticForm->getSourceRange(); 1724 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1725 if (Beg.isInvalid()) { 1726 // Find the first non-null initializer. 1727 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1728 E = InitExprs.end(); 1729 I != E; ++I) { 1730 if (Stmt *S = *I) { 1731 Beg = S->getLocStart(); 1732 break; 1733 } 1734 } 1735 } 1736 if (End.isInvalid()) { 1737 // Find the first non-null initializer from the end. 1738 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1739 E = InitExprs.rend(); 1740 I != E; ++I) { 1741 if (Stmt *S = *I) { 1742 End = S->getSourceRange().getEnd(); 1743 break; 1744 } 1745 } 1746 } 1747 return SourceRange(Beg, End); 1748} 1749 1750/// getFunctionType - Return the underlying function type for this block. 1751/// 1752const FunctionProtoType *BlockExpr::getFunctionType() const { 1753 // The block pointer is never sugared, but the function type might be. 1754 return cast<BlockPointerType>(getType()) 1755 ->getPointeeType()->castAs<FunctionProtoType>(); 1756} 1757 1758SourceLocation BlockExpr::getCaretLocation() const { 1759 return TheBlock->getCaretLocation(); 1760} 1761const Stmt *BlockExpr::getBody() const { 1762 return TheBlock->getBody(); 1763} 1764Stmt *BlockExpr::getBody() { 1765 return TheBlock->getBody(); 1766} 1767 1768 1769//===----------------------------------------------------------------------===// 1770// Generic Expression Routines 1771//===----------------------------------------------------------------------===// 1772 1773/// isUnusedResultAWarning - Return true if this immediate expression should 1774/// be warned about if the result is unused. If so, fill in Loc and Ranges 1775/// with location to warn on and the source range[s] to report with the 1776/// warning. 1777bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc, 1778 SourceRange &R1, SourceRange &R2, 1779 ASTContext &Ctx) const { 1780 // Don't warn if the expr is type dependent. The type could end up 1781 // instantiating to void. 1782 if (isTypeDependent()) 1783 return false; 1784 1785 switch (getStmtClass()) { 1786 default: 1787 if (getType()->isVoidType()) 1788 return false; 1789 WarnE = this; 1790 Loc = getExprLoc(); 1791 R1 = getSourceRange(); 1792 return true; 1793 case ParenExprClass: 1794 return cast<ParenExpr>(this)->getSubExpr()-> 1795 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1796 case GenericSelectionExprClass: 1797 return cast<GenericSelectionExpr>(this)->getResultExpr()-> 1798 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1799 case UnaryOperatorClass: { 1800 const UnaryOperator *UO = cast<UnaryOperator>(this); 1801 1802 switch (UO->getOpcode()) { 1803 case UO_Plus: 1804 case UO_Minus: 1805 case UO_AddrOf: 1806 case UO_Not: 1807 case UO_LNot: 1808 case UO_Deref: 1809 break; 1810 case UO_PostInc: 1811 case UO_PostDec: 1812 case UO_PreInc: 1813 case UO_PreDec: // ++/-- 1814 return false; // Not a warning. 1815 case UO_Real: 1816 case UO_Imag: 1817 // accessing a piece of a volatile complex is a side-effect. 1818 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1819 .isVolatileQualified()) 1820 return false; 1821 break; 1822 case UO_Extension: 1823 return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1824 } 1825 WarnE = this; 1826 Loc = UO->getOperatorLoc(); 1827 R1 = UO->getSubExpr()->getSourceRange(); 1828 return true; 1829 } 1830 case BinaryOperatorClass: { 1831 const BinaryOperator *BO = cast<BinaryOperator>(this); 1832 switch (BO->getOpcode()) { 1833 default: 1834 break; 1835 // Consider the RHS of comma for side effects. LHS was checked by 1836 // Sema::CheckCommaOperands. 1837 case BO_Comma: 1838 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1839 // lvalue-ness) of an assignment written in a macro. 1840 if (IntegerLiteral *IE = 1841 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1842 if (IE->getValue() == 0) 1843 return false; 1844 return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1845 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1846 case BO_LAnd: 1847 case BO_LOr: 1848 if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) || 1849 !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx)) 1850 return false; 1851 break; 1852 } 1853 if (BO->isAssignmentOp()) 1854 return false; 1855 WarnE = this; 1856 Loc = BO->getOperatorLoc(); 1857 R1 = BO->getLHS()->getSourceRange(); 1858 R2 = BO->getRHS()->getSourceRange(); 1859 return true; 1860 } 1861 case CompoundAssignOperatorClass: 1862 case VAArgExprClass: 1863 case AtomicExprClass: 1864 return false; 1865 1866 case ConditionalOperatorClass: { 1867 // If only one of the LHS or RHS is a warning, the operator might 1868 // be being used for control flow. Only warn if both the LHS and 1869 // RHS are warnings. 1870 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1871 if (!Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx)) 1872 return false; 1873 if (!Exp->getLHS()) 1874 return true; 1875 return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1876 } 1877 1878 case MemberExprClass: 1879 WarnE = this; 1880 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1881 R1 = SourceRange(Loc, Loc); 1882 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1883 return true; 1884 1885 case ArraySubscriptExprClass: 1886 WarnE = this; 1887 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1888 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1889 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1890 return true; 1891 1892 case CXXOperatorCallExprClass: { 1893 // We warn about operator== and operator!= even when user-defined operator 1894 // overloads as there is no reasonable way to define these such that they 1895 // have non-trivial, desirable side-effects. See the -Wunused-comparison 1896 // warning: these operators are commonly typo'ed, and so warning on them 1897 // provides additional value as well. If this list is updated, 1898 // DiagnoseUnusedComparison should be as well. 1899 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this); 1900 if (Op->getOperator() == OO_EqualEqual || 1901 Op->getOperator() == OO_ExclaimEqual) { 1902 WarnE = this; 1903 Loc = Op->getOperatorLoc(); 1904 R1 = Op->getSourceRange(); 1905 return true; 1906 } 1907 1908 // Fallthrough for generic call handling. 1909 } 1910 case CallExprClass: 1911 case CXXMemberCallExprClass: 1912 case UserDefinedLiteralClass: { 1913 // If this is a direct call, get the callee. 1914 const CallExpr *CE = cast<CallExpr>(this); 1915 if (const Decl *FD = CE->getCalleeDecl()) { 1916 // If the callee has attribute pure, const, or warn_unused_result, warn 1917 // about it. void foo() { strlen("bar"); } should warn. 1918 // 1919 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1920 // updated to match for QoI. 1921 if (FD->getAttr<WarnUnusedResultAttr>() || 1922 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1923 WarnE = this; 1924 Loc = CE->getCallee()->getLocStart(); 1925 R1 = CE->getCallee()->getSourceRange(); 1926 1927 if (unsigned NumArgs = CE->getNumArgs()) 1928 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1929 CE->getArg(NumArgs-1)->getLocEnd()); 1930 return true; 1931 } 1932 } 1933 return false; 1934 } 1935 1936 case CXXTemporaryObjectExprClass: 1937 case CXXConstructExprClass: 1938 return false; 1939 1940 case ObjCMessageExprClass: { 1941 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1942 if (Ctx.getLangOpts().ObjCAutoRefCount && 1943 ME->isInstanceMessage() && 1944 !ME->getType()->isVoidType() && 1945 ME->getSelector().getIdentifierInfoForSlot(0) && 1946 ME->getSelector().getIdentifierInfoForSlot(0) 1947 ->getName().startswith("init")) { 1948 WarnE = this; 1949 Loc = getExprLoc(); 1950 R1 = ME->getSourceRange(); 1951 return true; 1952 } 1953 1954 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1955 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1956 WarnE = this; 1957 Loc = getExprLoc(); 1958 return true; 1959 } 1960 return false; 1961 } 1962 1963 case ObjCPropertyRefExprClass: 1964 WarnE = this; 1965 Loc = getExprLoc(); 1966 R1 = getSourceRange(); 1967 return true; 1968 1969 case PseudoObjectExprClass: { 1970 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this); 1971 1972 // Only complain about things that have the form of a getter. 1973 if (isa<UnaryOperator>(PO->getSyntacticForm()) || 1974 isa<BinaryOperator>(PO->getSyntacticForm())) 1975 return false; 1976 1977 WarnE = this; 1978 Loc = getExprLoc(); 1979 R1 = getSourceRange(); 1980 return true; 1981 } 1982 1983 case StmtExprClass: { 1984 // Statement exprs don't logically have side effects themselves, but are 1985 // sometimes used in macros in ways that give them a type that is unused. 1986 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1987 // however, if the result of the stmt expr is dead, we don't want to emit a 1988 // warning. 1989 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1990 if (!CS->body_empty()) { 1991 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1992 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1993 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1994 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1995 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 1996 } 1997 1998 if (getType()->isVoidType()) 1999 return false; 2000 WarnE = this; 2001 Loc = cast<StmtExpr>(this)->getLParenLoc(); 2002 R1 = getSourceRange(); 2003 return true; 2004 } 2005 case CStyleCastExprClass: { 2006 // Ignore an explicit cast to void unless the operand is a non-trivial 2007 // volatile lvalue. 2008 const CastExpr *CE = cast<CastExpr>(this); 2009 if (CE->getCastKind() == CK_ToVoid) { 2010 if (CE->getSubExpr()->isGLValue() && 2011 CE->getSubExpr()->getType().isVolatileQualified()) { 2012 const DeclRefExpr *DRE = 2013 dyn_cast<DeclRefExpr>(CE->getSubExpr()->IgnoreParens()); 2014 if (!(DRE && isa<VarDecl>(DRE->getDecl()) && 2015 cast<VarDecl>(DRE->getDecl())->hasLocalStorage())) { 2016 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, 2017 R1, R2, Ctx); 2018 } 2019 } 2020 return false; 2021 } 2022 2023 // If this is a cast to a constructor conversion, check the operand. 2024 // Otherwise, the result of the cast is unused. 2025 if (CE->getCastKind() == CK_ConstructorConversion) 2026 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 2027 2028 WarnE = this; 2029 if (const CXXFunctionalCastExpr *CXXCE = 2030 dyn_cast<CXXFunctionalCastExpr>(this)) { 2031 Loc = CXXCE->getTypeBeginLoc(); 2032 R1 = CXXCE->getSubExpr()->getSourceRange(); 2033 } else { 2034 const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(this); 2035 Loc = CStyleCE->getLParenLoc(); 2036 R1 = CStyleCE->getSubExpr()->getSourceRange(); 2037 } 2038 return true; 2039 } 2040 case ImplicitCastExprClass: { 2041 const CastExpr *ICE = cast<ImplicitCastExpr>(this); 2042 2043 // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect. 2044 if (ICE->getCastKind() == CK_LValueToRValue && 2045 ICE->getSubExpr()->getType().isVolatileQualified()) 2046 return false; 2047 2048 return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx); 2049 } 2050 case CXXDefaultArgExprClass: 2051 return (cast<CXXDefaultArgExpr>(this) 2052 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx)); 2053 2054 case CXXNewExprClass: 2055 // FIXME: In theory, there might be new expressions that don't have side 2056 // effects (e.g. a placement new with an uninitialized POD). 2057 case CXXDeleteExprClass: 2058 return false; 2059 case CXXBindTemporaryExprClass: 2060 return (cast<CXXBindTemporaryExpr>(this) 2061 ->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx)); 2062 case ExprWithCleanupsClass: 2063 return (cast<ExprWithCleanups>(this) 2064 ->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx)); 2065 } 2066} 2067 2068/// isOBJCGCCandidate - Check if an expression is objc gc'able. 2069/// returns true, if it is; false otherwise. 2070bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 2071 const Expr *E = IgnoreParens(); 2072 switch (E->getStmtClass()) { 2073 default: 2074 return false; 2075 case ObjCIvarRefExprClass: 2076 return true; 2077 case Expr::UnaryOperatorClass: 2078 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 2079 case ImplicitCastExprClass: 2080 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 2081 case MaterializeTemporaryExprClass: 2082 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr() 2083 ->isOBJCGCCandidate(Ctx); 2084 case CStyleCastExprClass: 2085 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx); 2086 case DeclRefExprClass: { 2087 const Decl *D = cast<DeclRefExpr>(E)->getDecl(); 2088 2089 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 2090 if (VD->hasGlobalStorage()) 2091 return true; 2092 QualType T = VD->getType(); 2093 // dereferencing to a pointer is always a gc'able candidate, 2094 // unless it is __weak. 2095 return T->isPointerType() && 2096 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 2097 } 2098 return false; 2099 } 2100 case MemberExprClass: { 2101 const MemberExpr *M = cast<MemberExpr>(E); 2102 return M->getBase()->isOBJCGCCandidate(Ctx); 2103 } 2104 case ArraySubscriptExprClass: 2105 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx); 2106 } 2107} 2108 2109bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 2110 if (isTypeDependent()) 2111 return false; 2112 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 2113} 2114 2115QualType Expr::findBoundMemberType(const Expr *expr) { 2116 assert(expr->hasPlaceholderType(BuiltinType::BoundMember)); 2117 2118 // Bound member expressions are always one of these possibilities: 2119 // x->m x.m x->*y x.*y 2120 // (possibly parenthesized) 2121 2122 expr = expr->IgnoreParens(); 2123 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) { 2124 assert(isa<CXXMethodDecl>(mem->getMemberDecl())); 2125 return mem->getMemberDecl()->getType(); 2126 } 2127 2128 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) { 2129 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>() 2130 ->getPointeeType(); 2131 assert(type->isFunctionType()); 2132 return type; 2133 } 2134 2135 assert(isa<UnresolvedMemberExpr>(expr)); 2136 return QualType(); 2137} 2138 2139Expr* Expr::IgnoreParens() { 2140 Expr* E = this; 2141 while (true) { 2142 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2143 E = P->getSubExpr(); 2144 continue; 2145 } 2146 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2147 if (P->getOpcode() == UO_Extension) { 2148 E = P->getSubExpr(); 2149 continue; 2150 } 2151 } 2152 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2153 if (!P->isResultDependent()) { 2154 E = P->getResultExpr(); 2155 continue; 2156 } 2157 } 2158 return E; 2159 } 2160} 2161 2162/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 2163/// or CastExprs or ImplicitCastExprs, returning their operand. 2164Expr *Expr::IgnoreParenCasts() { 2165 Expr *E = this; 2166 while (true) { 2167 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 2168 E = P->getSubExpr(); 2169 continue; 2170 } 2171 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2172 E = P->getSubExpr(); 2173 continue; 2174 } 2175 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2176 if (P->getOpcode() == UO_Extension) { 2177 E = P->getSubExpr(); 2178 continue; 2179 } 2180 } 2181 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2182 if (!P->isResultDependent()) { 2183 E = P->getResultExpr(); 2184 continue; 2185 } 2186 } 2187 if (MaterializeTemporaryExpr *Materialize 2188 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2189 E = Materialize->GetTemporaryExpr(); 2190 continue; 2191 } 2192 if (SubstNonTypeTemplateParmExpr *NTTP 2193 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2194 E = NTTP->getReplacement(); 2195 continue; 2196 } 2197 return E; 2198 } 2199} 2200 2201/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 2202/// casts. This is intended purely as a temporary workaround for code 2203/// that hasn't yet been rewritten to do the right thing about those 2204/// casts, and may disappear along with the last internal use. 2205Expr *Expr::IgnoreParenLValueCasts() { 2206 Expr *E = this; 2207 while (true) { 2208 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2209 E = P->getSubExpr(); 2210 continue; 2211 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2212 if (P->getCastKind() == CK_LValueToRValue) { 2213 E = P->getSubExpr(); 2214 continue; 2215 } 2216 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2217 if (P->getOpcode() == UO_Extension) { 2218 E = P->getSubExpr(); 2219 continue; 2220 } 2221 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2222 if (!P->isResultDependent()) { 2223 E = P->getResultExpr(); 2224 continue; 2225 } 2226 } else if (MaterializeTemporaryExpr *Materialize 2227 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2228 E = Materialize->GetTemporaryExpr(); 2229 continue; 2230 } else if (SubstNonTypeTemplateParmExpr *NTTP 2231 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2232 E = NTTP->getReplacement(); 2233 continue; 2234 } 2235 break; 2236 } 2237 return E; 2238} 2239 2240Expr *Expr::IgnoreParenImpCasts() { 2241 Expr *E = this; 2242 while (true) { 2243 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2244 E = P->getSubExpr(); 2245 continue; 2246 } 2247 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 2248 E = P->getSubExpr(); 2249 continue; 2250 } 2251 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2252 if (P->getOpcode() == UO_Extension) { 2253 E = P->getSubExpr(); 2254 continue; 2255 } 2256 } 2257 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2258 if (!P->isResultDependent()) { 2259 E = P->getResultExpr(); 2260 continue; 2261 } 2262 } 2263 if (MaterializeTemporaryExpr *Materialize 2264 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2265 E = Materialize->GetTemporaryExpr(); 2266 continue; 2267 } 2268 if (SubstNonTypeTemplateParmExpr *NTTP 2269 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2270 E = NTTP->getReplacement(); 2271 continue; 2272 } 2273 return E; 2274 } 2275} 2276 2277Expr *Expr::IgnoreConversionOperator() { 2278 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) { 2279 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl())) 2280 return MCE->getImplicitObjectArgument(); 2281 } 2282 return this; 2283} 2284 2285/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 2286/// value (including ptr->int casts of the same size). Strip off any 2287/// ParenExpr or CastExprs, returning their operand. 2288Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 2289 Expr *E = this; 2290 while (true) { 2291 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 2292 E = P->getSubExpr(); 2293 continue; 2294 } 2295 2296 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 2297 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 2298 // ptr<->int casts of the same width. We also ignore all identity casts. 2299 Expr *SE = P->getSubExpr(); 2300 2301 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 2302 E = SE; 2303 continue; 2304 } 2305 2306 if ((E->getType()->isPointerType() || 2307 E->getType()->isIntegralType(Ctx)) && 2308 (SE->getType()->isPointerType() || 2309 SE->getType()->isIntegralType(Ctx)) && 2310 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 2311 E = SE; 2312 continue; 2313 } 2314 } 2315 2316 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 2317 if (P->getOpcode() == UO_Extension) { 2318 E = P->getSubExpr(); 2319 continue; 2320 } 2321 } 2322 2323 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) { 2324 if (!P->isResultDependent()) { 2325 E = P->getResultExpr(); 2326 continue; 2327 } 2328 } 2329 2330 if (SubstNonTypeTemplateParmExpr *NTTP 2331 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) { 2332 E = NTTP->getReplacement(); 2333 continue; 2334 } 2335 2336 return E; 2337 } 2338} 2339 2340bool Expr::isDefaultArgument() const { 2341 const Expr *E = this; 2342 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2343 E = M->GetTemporaryExpr(); 2344 2345 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 2346 E = ICE->getSubExprAsWritten(); 2347 2348 return isa<CXXDefaultArgExpr>(E); 2349} 2350 2351/// \brief Skip over any no-op casts and any temporary-binding 2352/// expressions. 2353static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 2354 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E)) 2355 E = M->GetTemporaryExpr(); 2356 2357 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2358 if (ICE->getCastKind() == CK_NoOp) 2359 E = ICE->getSubExpr(); 2360 else 2361 break; 2362 } 2363 2364 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2365 E = BE->getSubExpr(); 2366 2367 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2368 if (ICE->getCastKind() == CK_NoOp) 2369 E = ICE->getSubExpr(); 2370 else 2371 break; 2372 } 2373 2374 return E->IgnoreParens(); 2375} 2376 2377/// isTemporaryObject - Determines if this expression produces a 2378/// temporary of the given class type. 2379bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 2380 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 2381 return false; 2382 2383 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 2384 2385 // Temporaries are by definition pr-values of class type. 2386 if (!E->Classify(C).isPRValue()) { 2387 // In this context, property reference is a message call and is pr-value. 2388 if (!isa<ObjCPropertyRefExpr>(E)) 2389 return false; 2390 } 2391 2392 // Black-list a few cases which yield pr-values of class type that don't 2393 // refer to temporaries of that type: 2394 2395 // - implicit derived-to-base conversions 2396 if (isa<ImplicitCastExpr>(E)) { 2397 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 2398 case CK_DerivedToBase: 2399 case CK_UncheckedDerivedToBase: 2400 return false; 2401 default: 2402 break; 2403 } 2404 } 2405 2406 // - member expressions (all) 2407 if (isa<MemberExpr>(E)) 2408 return false; 2409 2410 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) 2411 if (BO->isPtrMemOp()) 2412 return false; 2413 2414 // - opaque values (all) 2415 if (isa<OpaqueValueExpr>(E)) 2416 return false; 2417 2418 return true; 2419} 2420 2421bool Expr::isImplicitCXXThis() const { 2422 const Expr *E = this; 2423 2424 // Strip away parentheses and casts we don't care about. 2425 while (true) { 2426 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) { 2427 E = Paren->getSubExpr(); 2428 continue; 2429 } 2430 2431 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2432 if (ICE->getCastKind() == CK_NoOp || 2433 ICE->getCastKind() == CK_LValueToRValue || 2434 ICE->getCastKind() == CK_DerivedToBase || 2435 ICE->getCastKind() == CK_UncheckedDerivedToBase) { 2436 E = ICE->getSubExpr(); 2437 continue; 2438 } 2439 } 2440 2441 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) { 2442 if (UnOp->getOpcode() == UO_Extension) { 2443 E = UnOp->getSubExpr(); 2444 continue; 2445 } 2446 } 2447 2448 if (const MaterializeTemporaryExpr *M 2449 = dyn_cast<MaterializeTemporaryExpr>(E)) { 2450 E = M->GetTemporaryExpr(); 2451 continue; 2452 } 2453 2454 break; 2455 } 2456 2457 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E)) 2458 return This->isImplicit(); 2459 2460 return false; 2461} 2462 2463/// hasAnyTypeDependentArguments - Determines if any of the expressions 2464/// in Exprs is type-dependent. 2465bool Expr::hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs) { 2466 for (unsigned I = 0; I < Exprs.size(); ++I) 2467 if (Exprs[I]->isTypeDependent()) 2468 return true; 2469 2470 return false; 2471} 2472 2473bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 2474 // This function is attempting whether an expression is an initializer 2475 // which can be evaluated at compile-time. isEvaluatable handles most 2476 // of the cases, but it can't deal with some initializer-specific 2477 // expressions, and it can't deal with aggregates; we deal with those here, 2478 // and fall back to isEvaluatable for the other cases. 2479 2480 // If we ever capture reference-binding directly in the AST, we can 2481 // kill the second parameter. 2482 2483 if (IsForRef) { 2484 EvalResult Result; 2485 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 2486 } 2487 2488 switch (getStmtClass()) { 2489 default: break; 2490 case IntegerLiteralClass: 2491 case FloatingLiteralClass: 2492 case StringLiteralClass: 2493 case ObjCStringLiteralClass: 2494 case ObjCEncodeExprClass: 2495 return true; 2496 case CXXTemporaryObjectExprClass: 2497 case CXXConstructExprClass: { 2498 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 2499 2500 // Only if it's 2501 if (CE->getConstructor()->isTrivial()) { 2502 // 1) an application of the trivial default constructor or 2503 if (!CE->getNumArgs()) return true; 2504 2505 // 2) an elidable trivial copy construction of an operand which is 2506 // itself a constant initializer. Note that we consider the 2507 // operand on its own, *not* as a reference binding. 2508 if (CE->isElidable() && 2509 CE->getArg(0)->isConstantInitializer(Ctx, false)) 2510 return true; 2511 } 2512 2513 // 3) a foldable constexpr constructor. 2514 break; 2515 } 2516 case CompoundLiteralExprClass: { 2517 // This handles gcc's extension that allows global initializers like 2518 // "struct x {int x;} x = (struct x) {};". 2519 // FIXME: This accepts other cases it shouldn't! 2520 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 2521 return Exp->isConstantInitializer(Ctx, false); 2522 } 2523 case InitListExprClass: { 2524 // FIXME: This doesn't deal with fields with reference types correctly. 2525 // FIXME: This incorrectly allows pointers cast to integers to be assigned 2526 // to bitfields. 2527 const InitListExpr *Exp = cast<InitListExpr>(this); 2528 unsigned numInits = Exp->getNumInits(); 2529 for (unsigned i = 0; i < numInits; i++) { 2530 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 2531 return false; 2532 } 2533 return true; 2534 } 2535 case ImplicitValueInitExprClass: 2536 return true; 2537 case ParenExprClass: 2538 return cast<ParenExpr>(this)->getSubExpr() 2539 ->isConstantInitializer(Ctx, IsForRef); 2540 case GenericSelectionExprClass: 2541 if (cast<GenericSelectionExpr>(this)->isResultDependent()) 2542 return false; 2543 return cast<GenericSelectionExpr>(this)->getResultExpr() 2544 ->isConstantInitializer(Ctx, IsForRef); 2545 case ChooseExprClass: 2546 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 2547 ->isConstantInitializer(Ctx, IsForRef); 2548 case UnaryOperatorClass: { 2549 const UnaryOperator* Exp = cast<UnaryOperator>(this); 2550 if (Exp->getOpcode() == UO_Extension) 2551 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 2552 break; 2553 } 2554 case CXXFunctionalCastExprClass: 2555 case CXXStaticCastExprClass: 2556 case ImplicitCastExprClass: 2557 case CStyleCastExprClass: { 2558 const CastExpr *CE = cast<CastExpr>(this); 2559 2560 // If we're promoting an integer to an _Atomic type then this is constant 2561 // if the integer is constant. We also need to check the converse in case 2562 // someone does something like: 2563 // 2564 // int a = (_Atomic(int))42; 2565 // 2566 // I doubt anyone would write code like this directly, but it's quite 2567 // possible as the result of macro expansions. 2568 if (CE->getCastKind() == CK_NonAtomicToAtomic || 2569 CE->getCastKind() == CK_AtomicToNonAtomic) 2570 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2571 2572 // Handle bitcasts of vector constants. 2573 if (getType()->isVectorType() && CE->getCastKind() == CK_BitCast) 2574 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2575 2576 // Handle misc casts we want to ignore. 2577 // FIXME: Is it really safe to ignore all these? 2578 if (CE->getCastKind() == CK_NoOp || 2579 CE->getCastKind() == CK_LValueToRValue || 2580 CE->getCastKind() == CK_ToUnion || 2581 CE->getCastKind() == CK_ConstructorConversion) 2582 return CE->getSubExpr()->isConstantInitializer(Ctx, false); 2583 2584 break; 2585 } 2586 case MaterializeTemporaryExprClass: 2587 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr() 2588 ->isConstantInitializer(Ctx, false); 2589 } 2590 return isEvaluatable(Ctx); 2591} 2592 2593namespace { 2594 /// \brief Look for a call to a non-trivial function within an expression. 2595 class NonTrivialCallFinder : public EvaluatedExprVisitor<NonTrivialCallFinder> 2596 { 2597 typedef EvaluatedExprVisitor<NonTrivialCallFinder> Inherited; 2598 2599 bool NonTrivial; 2600 2601 public: 2602 explicit NonTrivialCallFinder(ASTContext &Context) 2603 : Inherited(Context), NonTrivial(false) { } 2604 2605 bool hasNonTrivialCall() const { return NonTrivial; } 2606 2607 void VisitCallExpr(CallExpr *E) { 2608 if (CXXMethodDecl *Method 2609 = dyn_cast_or_null<CXXMethodDecl>(E->getCalleeDecl())) { 2610 if (Method->isTrivial()) { 2611 // Recurse to children of the call. 2612 Inherited::VisitStmt(E); 2613 return; 2614 } 2615 } 2616 2617 NonTrivial = true; 2618 } 2619 2620 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2621 if (E->getConstructor()->isTrivial()) { 2622 // Recurse to children of the call. 2623 Inherited::VisitStmt(E); 2624 return; 2625 } 2626 2627 NonTrivial = true; 2628 } 2629 2630 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 2631 if (E->getTemporary()->getDestructor()->isTrivial()) { 2632 Inherited::VisitStmt(E); 2633 return; 2634 } 2635 2636 NonTrivial = true; 2637 } 2638 }; 2639} 2640 2641bool Expr::hasNonTrivialCall(ASTContext &Ctx) { 2642 NonTrivialCallFinder Finder(Ctx); 2643 Finder.Visit(this); 2644 return Finder.hasNonTrivialCall(); 2645} 2646 2647/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null 2648/// pointer constant or not, as well as the specific kind of constant detected. 2649/// Null pointer constants can be integer constant expressions with the 2650/// value zero, casts of zero to void*, nullptr (C++0X), or __null 2651/// (a GNU extension). 2652Expr::NullPointerConstantKind 2653Expr::isNullPointerConstant(ASTContext &Ctx, 2654 NullPointerConstantValueDependence NPC) const { 2655 if (isValueDependent()) { 2656 switch (NPC) { 2657 case NPC_NeverValueDependent: 2658 llvm_unreachable("Unexpected value dependent expression!"); 2659 case NPC_ValueDependentIsNull: 2660 if (isTypeDependent() || getType()->isIntegralType(Ctx)) 2661 return NPCK_ZeroInteger; 2662 else 2663 return NPCK_NotNull; 2664 2665 case NPC_ValueDependentIsNotNull: 2666 return NPCK_NotNull; 2667 } 2668 } 2669 2670 // Strip off a cast to void*, if it exists. Except in C++. 2671 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2672 if (!Ctx.getLangOpts().CPlusPlus) { 2673 // Check that it is a cast to void*. 2674 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2675 QualType Pointee = PT->getPointeeType(); 2676 if (!Pointee.hasQualifiers() && 2677 Pointee->isVoidType() && // to void* 2678 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2679 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2680 } 2681 } 2682 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2683 // Ignore the ImplicitCastExpr type entirely. 2684 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2685 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2686 // Accept ((void*)0) as a null pointer constant, as many other 2687 // implementations do. 2688 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2689 } else if (const GenericSelectionExpr *GE = 2690 dyn_cast<GenericSelectionExpr>(this)) { 2691 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC); 2692 } else if (const CXXDefaultArgExpr *DefaultArg 2693 = dyn_cast<CXXDefaultArgExpr>(this)) { 2694 // See through default argument expressions 2695 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2696 } else if (isa<GNUNullExpr>(this)) { 2697 // The GNU __null extension is always a null pointer constant. 2698 return NPCK_GNUNull; 2699 } else if (const MaterializeTemporaryExpr *M 2700 = dyn_cast<MaterializeTemporaryExpr>(this)) { 2701 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC); 2702 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) { 2703 if (const Expr *Source = OVE->getSourceExpr()) 2704 return Source->isNullPointerConstant(Ctx, NPC); 2705 } 2706 2707 // C++0x nullptr_t is always a null pointer constant. 2708 if (getType()->isNullPtrType()) 2709 return NPCK_CXX0X_nullptr; 2710 2711 if (const RecordType *UT = getType()->getAsUnionType()) 2712 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2713 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2714 const Expr *InitExpr = CLE->getInitializer(); 2715 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2716 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2717 } 2718 // This expression must be an integer type. 2719 if (!getType()->isIntegerType() || 2720 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType())) 2721 return NPCK_NotNull; 2722 2723 // If we have an integer constant expression, we need to *evaluate* it and 2724 // test for the value 0. Don't use the C++11 constant expression semantics 2725 // for this, for now; once the dust settles on core issue 903, we might only 2726 // allow a literal 0 here in C++11 mode. 2727 if (Ctx.getLangOpts().CPlusPlus0x) { 2728 if (!isCXX98IntegralConstantExpr(Ctx)) 2729 return NPCK_NotNull; 2730 } else { 2731 if (!isIntegerConstantExpr(Ctx)) 2732 return NPCK_NotNull; 2733 } 2734 2735 return (EvaluateKnownConstInt(Ctx) == 0) ? NPCK_ZeroInteger : NPCK_NotNull; 2736} 2737 2738/// \brief If this expression is an l-value for an Objective C 2739/// property, find the underlying property reference expression. 2740const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2741 const Expr *E = this; 2742 while (true) { 2743 assert((E->getValueKind() == VK_LValue && 2744 E->getObjectKind() == OK_ObjCProperty) && 2745 "expression is not a property reference"); 2746 E = E->IgnoreParenCasts(); 2747 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2748 if (BO->getOpcode() == BO_Comma) { 2749 E = BO->getRHS(); 2750 continue; 2751 } 2752 } 2753 2754 break; 2755 } 2756 2757 return cast<ObjCPropertyRefExpr>(E); 2758} 2759 2760FieldDecl *Expr::getBitField() { 2761 Expr *E = this->IgnoreParens(); 2762 2763 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2764 if (ICE->getCastKind() == CK_LValueToRValue || 2765 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2766 E = ICE->getSubExpr()->IgnoreParens(); 2767 else 2768 break; 2769 } 2770 2771 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2772 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2773 if (Field->isBitField()) 2774 return Field; 2775 2776 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2777 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2778 if (Field->isBitField()) 2779 return Field; 2780 2781 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) { 2782 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2783 return BinOp->getLHS()->getBitField(); 2784 2785 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS()) 2786 return BinOp->getRHS()->getBitField(); 2787 } 2788 2789 return 0; 2790} 2791 2792bool Expr::refersToVectorElement() const { 2793 const Expr *E = this->IgnoreParens(); 2794 2795 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2796 if (ICE->getValueKind() != VK_RValue && 2797 ICE->getCastKind() == CK_NoOp) 2798 E = ICE->getSubExpr()->IgnoreParens(); 2799 else 2800 break; 2801 } 2802 2803 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2804 return ASE->getBase()->getType()->isVectorType(); 2805 2806 if (isa<ExtVectorElementExpr>(E)) 2807 return true; 2808 2809 return false; 2810} 2811 2812/// isArrow - Return true if the base expression is a pointer to vector, 2813/// return false if the base expression is a vector. 2814bool ExtVectorElementExpr::isArrow() const { 2815 return getBase()->getType()->isPointerType(); 2816} 2817 2818unsigned ExtVectorElementExpr::getNumElements() const { 2819 if (const VectorType *VT = getType()->getAs<VectorType>()) 2820 return VT->getNumElements(); 2821 return 1; 2822} 2823 2824/// containsDuplicateElements - Return true if any element access is repeated. 2825bool ExtVectorElementExpr::containsDuplicateElements() const { 2826 // FIXME: Refactor this code to an accessor on the AST node which returns the 2827 // "type" of component access, and share with code below and in Sema. 2828 StringRef Comp = Accessor->getName(); 2829 2830 // Halving swizzles do not contain duplicate elements. 2831 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2832 return false; 2833 2834 // Advance past s-char prefix on hex swizzles. 2835 if (Comp[0] == 's' || Comp[0] == 'S') 2836 Comp = Comp.substr(1); 2837 2838 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2839 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos) 2840 return true; 2841 2842 return false; 2843} 2844 2845/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2846void ExtVectorElementExpr::getEncodedElementAccess( 2847 SmallVectorImpl<unsigned> &Elts) const { 2848 StringRef Comp = Accessor->getName(); 2849 if (Comp[0] == 's' || Comp[0] == 'S') 2850 Comp = Comp.substr(1); 2851 2852 bool isHi = Comp == "hi"; 2853 bool isLo = Comp == "lo"; 2854 bool isEven = Comp == "even"; 2855 bool isOdd = Comp == "odd"; 2856 2857 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2858 uint64_t Index; 2859 2860 if (isHi) 2861 Index = e + i; 2862 else if (isLo) 2863 Index = i; 2864 else if (isEven) 2865 Index = 2 * i; 2866 else if (isOdd) 2867 Index = 2 * i + 1; 2868 else 2869 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2870 2871 Elts.push_back(Index); 2872 } 2873} 2874 2875ObjCMessageExpr::ObjCMessageExpr(QualType T, 2876 ExprValueKind VK, 2877 SourceLocation LBracLoc, 2878 SourceLocation SuperLoc, 2879 bool IsInstanceSuper, 2880 QualType SuperType, 2881 Selector Sel, 2882 ArrayRef<SourceLocation> SelLocs, 2883 SelectorLocationsKind SelLocsK, 2884 ObjCMethodDecl *Method, 2885 ArrayRef<Expr *> Args, 2886 SourceLocation RBracLoc, 2887 bool isImplicit) 2888 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2889 /*TypeDependent=*/false, /*ValueDependent=*/false, 2890 /*InstantiationDependent=*/false, 2891 /*ContainsUnexpandedParameterPack=*/false), 2892 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2893 : Sel.getAsOpaquePtr())), 2894 Kind(IsInstanceSuper? SuperInstance : SuperClass), 2895 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 2896 SuperLoc(SuperLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2897{ 2898 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 2899 setReceiverPointer(SuperType.getAsOpaquePtr()); 2900} 2901 2902ObjCMessageExpr::ObjCMessageExpr(QualType T, 2903 ExprValueKind VK, 2904 SourceLocation LBracLoc, 2905 TypeSourceInfo *Receiver, 2906 Selector Sel, 2907 ArrayRef<SourceLocation> SelLocs, 2908 SelectorLocationsKind SelLocsK, 2909 ObjCMethodDecl *Method, 2910 ArrayRef<Expr *> Args, 2911 SourceLocation RBracLoc, 2912 bool isImplicit) 2913 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2914 T->isDependentType(), T->isInstantiationDependentType(), 2915 T->containsUnexpandedParameterPack()), 2916 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2917 : Sel.getAsOpaquePtr())), 2918 Kind(Class), 2919 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 2920 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2921{ 2922 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 2923 setReceiverPointer(Receiver); 2924} 2925 2926ObjCMessageExpr::ObjCMessageExpr(QualType T, 2927 ExprValueKind VK, 2928 SourceLocation LBracLoc, 2929 Expr *Receiver, 2930 Selector Sel, 2931 ArrayRef<SourceLocation> SelLocs, 2932 SelectorLocationsKind SelLocsK, 2933 ObjCMethodDecl *Method, 2934 ArrayRef<Expr *> Args, 2935 SourceLocation RBracLoc, 2936 bool isImplicit) 2937 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2938 Receiver->isTypeDependent(), 2939 Receiver->isInstantiationDependent(), 2940 Receiver->containsUnexpandedParameterPack()), 2941 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2942 : Sel.getAsOpaquePtr())), 2943 Kind(Instance), 2944 HasMethod(Method != 0), IsDelegateInitCall(false), IsImplicit(isImplicit), 2945 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2946{ 2947 initArgsAndSelLocs(Args, SelLocs, SelLocsK); 2948 setReceiverPointer(Receiver); 2949} 2950 2951void ObjCMessageExpr::initArgsAndSelLocs(ArrayRef<Expr *> Args, 2952 ArrayRef<SourceLocation> SelLocs, 2953 SelectorLocationsKind SelLocsK) { 2954 setNumArgs(Args.size()); 2955 Expr **MyArgs = getArgs(); 2956 for (unsigned I = 0; I != Args.size(); ++I) { 2957 if (Args[I]->isTypeDependent()) 2958 ExprBits.TypeDependent = true; 2959 if (Args[I]->isValueDependent()) 2960 ExprBits.ValueDependent = true; 2961 if (Args[I]->isInstantiationDependent()) 2962 ExprBits.InstantiationDependent = true; 2963 if (Args[I]->containsUnexpandedParameterPack()) 2964 ExprBits.ContainsUnexpandedParameterPack = true; 2965 2966 MyArgs[I] = Args[I]; 2967 } 2968 2969 SelLocsKind = SelLocsK; 2970 if (!isImplicit()) { 2971 if (SelLocsK == SelLoc_NonStandard) 2972 std::copy(SelLocs.begin(), SelLocs.end(), getStoredSelLocs()); 2973 } 2974} 2975 2976ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2977 ExprValueKind VK, 2978 SourceLocation LBracLoc, 2979 SourceLocation SuperLoc, 2980 bool IsInstanceSuper, 2981 QualType SuperType, 2982 Selector Sel, 2983 ArrayRef<SourceLocation> SelLocs, 2984 ObjCMethodDecl *Method, 2985 ArrayRef<Expr *> Args, 2986 SourceLocation RBracLoc, 2987 bool isImplicit) { 2988 assert((!SelLocs.empty() || isImplicit) && 2989 "No selector locs for non-implicit message"); 2990 ObjCMessageExpr *Mem; 2991 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 2992 if (isImplicit) 2993 Mem = alloc(Context, Args.size(), 0); 2994 else 2995 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 2996 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2997 SuperType, Sel, SelLocs, SelLocsK, 2998 Method, Args, RBracLoc, isImplicit); 2999} 3000 3001ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3002 ExprValueKind VK, 3003 SourceLocation LBracLoc, 3004 TypeSourceInfo *Receiver, 3005 Selector Sel, 3006 ArrayRef<SourceLocation> SelLocs, 3007 ObjCMethodDecl *Method, 3008 ArrayRef<Expr *> Args, 3009 SourceLocation RBracLoc, 3010 bool isImplicit) { 3011 assert((!SelLocs.empty() || isImplicit) && 3012 "No selector locs for non-implicit message"); 3013 ObjCMessageExpr *Mem; 3014 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3015 if (isImplicit) 3016 Mem = alloc(Context, Args.size(), 0); 3017 else 3018 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3019 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3020 SelLocs, SelLocsK, Method, Args, RBracLoc, 3021 isImplicit); 3022} 3023 3024ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 3025 ExprValueKind VK, 3026 SourceLocation LBracLoc, 3027 Expr *Receiver, 3028 Selector Sel, 3029 ArrayRef<SourceLocation> SelLocs, 3030 ObjCMethodDecl *Method, 3031 ArrayRef<Expr *> Args, 3032 SourceLocation RBracLoc, 3033 bool isImplicit) { 3034 assert((!SelLocs.empty() || isImplicit) && 3035 "No selector locs for non-implicit message"); 3036 ObjCMessageExpr *Mem; 3037 SelectorLocationsKind SelLocsK = SelectorLocationsKind(); 3038 if (isImplicit) 3039 Mem = alloc(Context, Args.size(), 0); 3040 else 3041 Mem = alloc(Context, Args, RBracLoc, SelLocs, Sel, SelLocsK); 3042 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, 3043 SelLocs, SelLocsK, Method, Args, RBracLoc, 3044 isImplicit); 3045} 3046 3047ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 3048 unsigned NumArgs, 3049 unsigned NumStoredSelLocs) { 3050 ObjCMessageExpr *Mem = alloc(Context, NumArgs, NumStoredSelLocs); 3051 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 3052} 3053 3054ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3055 ArrayRef<Expr *> Args, 3056 SourceLocation RBraceLoc, 3057 ArrayRef<SourceLocation> SelLocs, 3058 Selector Sel, 3059 SelectorLocationsKind &SelLocsK) { 3060 SelLocsK = hasStandardSelectorLocs(Sel, SelLocs, Args, RBraceLoc); 3061 unsigned NumStoredSelLocs = (SelLocsK == SelLoc_NonStandard) ? SelLocs.size() 3062 : 0; 3063 return alloc(C, Args.size(), NumStoredSelLocs); 3064} 3065 3066ObjCMessageExpr *ObjCMessageExpr::alloc(ASTContext &C, 3067 unsigned NumArgs, 3068 unsigned NumStoredSelLocs) { 3069 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 3070 NumArgs * sizeof(Expr *) + NumStoredSelLocs * sizeof(SourceLocation); 3071 return (ObjCMessageExpr *)C.Allocate(Size, 3072 llvm::AlignOf<ObjCMessageExpr>::Alignment); 3073} 3074 3075void ObjCMessageExpr::getSelectorLocs( 3076 SmallVectorImpl<SourceLocation> &SelLocs) const { 3077 for (unsigned i = 0, e = getNumSelectorLocs(); i != e; ++i) 3078 SelLocs.push_back(getSelectorLoc(i)); 3079} 3080 3081SourceRange ObjCMessageExpr::getReceiverRange() const { 3082 switch (getReceiverKind()) { 3083 case Instance: 3084 return getInstanceReceiver()->getSourceRange(); 3085 3086 case Class: 3087 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange(); 3088 3089 case SuperInstance: 3090 case SuperClass: 3091 return getSuperLoc(); 3092 } 3093 3094 llvm_unreachable("Invalid ReceiverKind!"); 3095} 3096 3097Selector ObjCMessageExpr::getSelector() const { 3098 if (HasMethod) 3099 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 3100 ->getSelector(); 3101 return Selector(SelectorOrMethod); 3102} 3103 3104ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 3105 switch (getReceiverKind()) { 3106 case Instance: 3107 if (const ObjCObjectPointerType *Ptr 3108 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 3109 return Ptr->getInterfaceDecl(); 3110 break; 3111 3112 case Class: 3113 if (const ObjCObjectType *Ty 3114 = getClassReceiver()->getAs<ObjCObjectType>()) 3115 return Ty->getInterface(); 3116 break; 3117 3118 case SuperInstance: 3119 if (const ObjCObjectPointerType *Ptr 3120 = getSuperType()->getAs<ObjCObjectPointerType>()) 3121 return Ptr->getInterfaceDecl(); 3122 break; 3123 3124 case SuperClass: 3125 if (const ObjCObjectType *Iface 3126 = getSuperType()->getAs<ObjCObjectType>()) 3127 return Iface->getInterface(); 3128 break; 3129 } 3130 3131 return 0; 3132} 3133 3134StringRef ObjCBridgedCastExpr::getBridgeKindName() const { 3135 switch (getBridgeKind()) { 3136 case OBC_Bridge: 3137 return "__bridge"; 3138 case OBC_BridgeTransfer: 3139 return "__bridge_transfer"; 3140 case OBC_BridgeRetained: 3141 return "__bridge_retained"; 3142 } 3143 3144 llvm_unreachable("Invalid BridgeKind!"); 3145} 3146 3147bool ChooseExpr::isConditionTrue(const ASTContext &C) const { 3148 return getCond()->EvaluateKnownConstInt(C) != 0; 3149} 3150 3151ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3152 QualType Type, SourceLocation BLoc, 3153 SourceLocation RP) 3154 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary, 3155 Type->isDependentType(), Type->isDependentType(), 3156 Type->isInstantiationDependentType(), 3157 Type->containsUnexpandedParameterPack()), 3158 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) 3159{ 3160 SubExprs = new (C) Stmt*[nexpr]; 3161 for (unsigned i = 0; i < nexpr; i++) { 3162 if (args[i]->isTypeDependent()) 3163 ExprBits.TypeDependent = true; 3164 if (args[i]->isValueDependent()) 3165 ExprBits.ValueDependent = true; 3166 if (args[i]->isInstantiationDependent()) 3167 ExprBits.InstantiationDependent = true; 3168 if (args[i]->containsUnexpandedParameterPack()) 3169 ExprBits.ContainsUnexpandedParameterPack = true; 3170 3171 SubExprs[i] = args[i]; 3172 } 3173} 3174 3175void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 3176 unsigned NumExprs) { 3177 if (SubExprs) C.Deallocate(SubExprs); 3178 3179 SubExprs = new (C) Stmt* [NumExprs]; 3180 this->NumExprs = NumExprs; 3181 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 3182} 3183 3184GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3185 SourceLocation GenericLoc, Expr *ControllingExpr, 3186 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3187 unsigned NumAssocs, SourceLocation DefaultLoc, 3188 SourceLocation RParenLoc, 3189 bool ContainsUnexpandedParameterPack, 3190 unsigned ResultIndex) 3191 : Expr(GenericSelectionExprClass, 3192 AssocExprs[ResultIndex]->getType(), 3193 AssocExprs[ResultIndex]->getValueKind(), 3194 AssocExprs[ResultIndex]->getObjectKind(), 3195 AssocExprs[ResultIndex]->isTypeDependent(), 3196 AssocExprs[ResultIndex]->isValueDependent(), 3197 AssocExprs[ResultIndex]->isInstantiationDependent(), 3198 ContainsUnexpandedParameterPack), 3199 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3200 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3201 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3202 RParenLoc(RParenLoc) { 3203 SubExprs[CONTROLLING] = ControllingExpr; 3204 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3205 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3206} 3207 3208GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context, 3209 SourceLocation GenericLoc, Expr *ControllingExpr, 3210 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3211 unsigned NumAssocs, SourceLocation DefaultLoc, 3212 SourceLocation RParenLoc, 3213 bool ContainsUnexpandedParameterPack) 3214 : Expr(GenericSelectionExprClass, 3215 Context.DependentTy, 3216 VK_RValue, 3217 OK_Ordinary, 3218 /*isTypeDependent=*/true, 3219 /*isValueDependent=*/true, 3220 /*isInstantiationDependent=*/true, 3221 ContainsUnexpandedParameterPack), 3222 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]), 3223 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs), 3224 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), 3225 RParenLoc(RParenLoc) { 3226 SubExprs[CONTROLLING] = ControllingExpr; 3227 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes); 3228 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR); 3229} 3230 3231//===----------------------------------------------------------------------===// 3232// DesignatedInitExpr 3233//===----------------------------------------------------------------------===// 3234 3235IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const { 3236 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3237 if (Field.NameOrField & 0x01) 3238 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 3239 else 3240 return getField()->getIdentifier(); 3241} 3242 3243DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 3244 unsigned NumDesignators, 3245 const Designator *Designators, 3246 SourceLocation EqualOrColonLoc, 3247 bool GNUSyntax, 3248 Expr **IndexExprs, 3249 unsigned NumIndexExprs, 3250 Expr *Init) 3251 : Expr(DesignatedInitExprClass, Ty, 3252 Init->getValueKind(), Init->getObjectKind(), 3253 Init->isTypeDependent(), Init->isValueDependent(), 3254 Init->isInstantiationDependent(), 3255 Init->containsUnexpandedParameterPack()), 3256 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 3257 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 3258 this->Designators = new (C) Designator[NumDesignators]; 3259 3260 // Record the initializer itself. 3261 child_range Child = children(); 3262 *Child++ = Init; 3263 3264 // Copy the designators and their subexpressions, computing 3265 // value-dependence along the way. 3266 unsigned IndexIdx = 0; 3267 for (unsigned I = 0; I != NumDesignators; ++I) { 3268 this->Designators[I] = Designators[I]; 3269 3270 if (this->Designators[I].isArrayDesignator()) { 3271 // Compute type- and value-dependence. 3272 Expr *Index = IndexExprs[IndexIdx]; 3273 if (Index->isTypeDependent() || Index->isValueDependent()) 3274 ExprBits.ValueDependent = true; 3275 if (Index->isInstantiationDependent()) 3276 ExprBits.InstantiationDependent = true; 3277 // Propagate unexpanded parameter packs. 3278 if (Index->containsUnexpandedParameterPack()) 3279 ExprBits.ContainsUnexpandedParameterPack = true; 3280 3281 // Copy the index expressions into permanent storage. 3282 *Child++ = IndexExprs[IndexIdx++]; 3283 } else if (this->Designators[I].isArrayRangeDesignator()) { 3284 // Compute type- and value-dependence. 3285 Expr *Start = IndexExprs[IndexIdx]; 3286 Expr *End = IndexExprs[IndexIdx + 1]; 3287 if (Start->isTypeDependent() || Start->isValueDependent() || 3288 End->isTypeDependent() || End->isValueDependent()) { 3289 ExprBits.ValueDependent = true; 3290 ExprBits.InstantiationDependent = true; 3291 } else if (Start->isInstantiationDependent() || 3292 End->isInstantiationDependent()) { 3293 ExprBits.InstantiationDependent = true; 3294 } 3295 3296 // Propagate unexpanded parameter packs. 3297 if (Start->containsUnexpandedParameterPack() || 3298 End->containsUnexpandedParameterPack()) 3299 ExprBits.ContainsUnexpandedParameterPack = true; 3300 3301 // Copy the start/end expressions into permanent storage. 3302 *Child++ = IndexExprs[IndexIdx++]; 3303 *Child++ = IndexExprs[IndexIdx++]; 3304 } 3305 } 3306 3307 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 3308} 3309 3310DesignatedInitExpr * 3311DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 3312 unsigned NumDesignators, 3313 Expr **IndexExprs, unsigned NumIndexExprs, 3314 SourceLocation ColonOrEqualLoc, 3315 bool UsesColonSyntax, Expr *Init) { 3316 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3317 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3318 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 3319 ColonOrEqualLoc, UsesColonSyntax, 3320 IndexExprs, NumIndexExprs, Init); 3321} 3322 3323DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 3324 unsigned NumIndexExprs) { 3325 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 3326 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 3327 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 3328} 3329 3330void DesignatedInitExpr::setDesignators(ASTContext &C, 3331 const Designator *Desigs, 3332 unsigned NumDesigs) { 3333 Designators = new (C) Designator[NumDesigs]; 3334 NumDesignators = NumDesigs; 3335 for (unsigned I = 0; I != NumDesigs; ++I) 3336 Designators[I] = Desigs[I]; 3337} 3338 3339SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { 3340 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this); 3341 if (size() == 1) 3342 return DIE->getDesignator(0)->getSourceRange(); 3343 return SourceRange(DIE->getDesignator(0)->getStartLocation(), 3344 DIE->getDesignator(size()-1)->getEndLocation()); 3345} 3346 3347SourceRange DesignatedInitExpr::getSourceRange() const { 3348 SourceLocation StartLoc; 3349 Designator &First = 3350 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 3351 if (First.isFieldDesignator()) { 3352 if (GNUSyntax) 3353 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 3354 else 3355 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 3356 } else 3357 StartLoc = 3358 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 3359 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 3360} 3361 3362Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 3363 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 3364 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3365 Ptr += sizeof(DesignatedInitExpr); 3366 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3367 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3368} 3369 3370Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 3371 assert(D.Kind == Designator::ArrayRangeDesignator && 3372 "Requires array range designator"); 3373 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3374 Ptr += sizeof(DesignatedInitExpr); 3375 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3376 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 3377} 3378 3379Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 3380 assert(D.Kind == Designator::ArrayRangeDesignator && 3381 "Requires array range designator"); 3382 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3383 Ptr += sizeof(DesignatedInitExpr); 3384 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 3385 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 3386} 3387 3388/// \brief Replaces the designator at index @p Idx with the series 3389/// of designators in [First, Last). 3390void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 3391 const Designator *First, 3392 const Designator *Last) { 3393 unsigned NumNewDesignators = Last - First; 3394 if (NumNewDesignators == 0) { 3395 std::copy_backward(Designators + Idx + 1, 3396 Designators + NumDesignators, 3397 Designators + Idx); 3398 --NumNewDesignators; 3399 return; 3400 } else if (NumNewDesignators == 1) { 3401 Designators[Idx] = *First; 3402 return; 3403 } 3404 3405 Designator *NewDesignators 3406 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 3407 std::copy(Designators, Designators + Idx, NewDesignators); 3408 std::copy(First, Last, NewDesignators + Idx); 3409 std::copy(Designators + Idx + 1, Designators + NumDesignators, 3410 NewDesignators + Idx + NumNewDesignators); 3411 Designators = NewDesignators; 3412 NumDesignators = NumDesignators - 1 + NumNewDesignators; 3413} 3414 3415ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 3416 Expr **exprs, unsigned nexprs, 3417 SourceLocation rparenloc) 3418 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 3419 false, false, false, false), 3420 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 3421 Exprs = new (C) Stmt*[nexprs]; 3422 for (unsigned i = 0; i != nexprs; ++i) { 3423 if (exprs[i]->isTypeDependent()) 3424 ExprBits.TypeDependent = true; 3425 if (exprs[i]->isValueDependent()) 3426 ExprBits.ValueDependent = true; 3427 if (exprs[i]->isInstantiationDependent()) 3428 ExprBits.InstantiationDependent = true; 3429 if (exprs[i]->containsUnexpandedParameterPack()) 3430 ExprBits.ContainsUnexpandedParameterPack = true; 3431 3432 Exprs[i] = exprs[i]; 3433 } 3434} 3435 3436const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) { 3437 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e)) 3438 e = ewc->getSubExpr(); 3439 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e)) 3440 e = m->GetTemporaryExpr(); 3441 e = cast<CXXConstructExpr>(e)->getArg(0); 3442 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3443 e = ice->getSubExpr(); 3444 return cast<OpaqueValueExpr>(e); 3445} 3446 3447PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &Context, EmptyShell sh, 3448 unsigned numSemanticExprs) { 3449 void *buffer = Context.Allocate(sizeof(PseudoObjectExpr) + 3450 (1 + numSemanticExprs) * sizeof(Expr*), 3451 llvm::alignOf<PseudoObjectExpr>()); 3452 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs); 3453} 3454 3455PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs) 3456 : Expr(PseudoObjectExprClass, shell) { 3457 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1; 3458} 3459 3460PseudoObjectExpr *PseudoObjectExpr::Create(ASTContext &C, Expr *syntax, 3461 ArrayRef<Expr*> semantics, 3462 unsigned resultIndex) { 3463 assert(syntax && "no syntactic expression!"); 3464 assert(semantics.size() && "no semantic expressions!"); 3465 3466 QualType type; 3467 ExprValueKind VK; 3468 if (resultIndex == NoResult) { 3469 type = C.VoidTy; 3470 VK = VK_RValue; 3471 } else { 3472 assert(resultIndex < semantics.size()); 3473 type = semantics[resultIndex]->getType(); 3474 VK = semantics[resultIndex]->getValueKind(); 3475 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary); 3476 } 3477 3478 void *buffer = C.Allocate(sizeof(PseudoObjectExpr) + 3479 (1 + semantics.size()) * sizeof(Expr*), 3480 llvm::alignOf<PseudoObjectExpr>()); 3481 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics, 3482 resultIndex); 3483} 3484 3485PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK, 3486 Expr *syntax, ArrayRef<Expr*> semantics, 3487 unsigned resultIndex) 3488 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary, 3489 /*filled in at end of ctor*/ false, false, false, false) { 3490 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1; 3491 PseudoObjectExprBits.ResultIndex = resultIndex + 1; 3492 3493 for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) { 3494 Expr *E = (i == 0 ? syntax : semantics[i-1]); 3495 getSubExprsBuffer()[i] = E; 3496 3497 if (E->isTypeDependent()) 3498 ExprBits.TypeDependent = true; 3499 if (E->isValueDependent()) 3500 ExprBits.ValueDependent = true; 3501 if (E->isInstantiationDependent()) 3502 ExprBits.InstantiationDependent = true; 3503 if (E->containsUnexpandedParameterPack()) 3504 ExprBits.ContainsUnexpandedParameterPack = true; 3505 3506 if (isa<OpaqueValueExpr>(E)) 3507 assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != 0 && 3508 "opaque-value semantic expressions for pseudo-object " 3509 "operations must have sources"); 3510 } 3511} 3512 3513//===----------------------------------------------------------------------===// 3514// ExprIterator. 3515//===----------------------------------------------------------------------===// 3516 3517Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 3518Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 3519Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 3520const Expr* ConstExprIterator::operator[](size_t idx) const { 3521 return cast<Expr>(I[idx]); 3522} 3523const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 3524const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 3525 3526//===----------------------------------------------------------------------===// 3527// Child Iterators for iterating over subexpressions/substatements 3528//===----------------------------------------------------------------------===// 3529 3530// UnaryExprOrTypeTraitExpr 3531Stmt::child_range UnaryExprOrTypeTraitExpr::children() { 3532 // If this is of a type and the type is a VLA type (and not a typedef), the 3533 // size expression of the VLA needs to be treated as an executable expression. 3534 // Why isn't this weirdness documented better in StmtIterator? 3535 if (isArgumentType()) { 3536 if (const VariableArrayType* T = dyn_cast<VariableArrayType>( 3537 getArgumentType().getTypePtr())) 3538 return child_range(child_iterator(T), child_iterator()); 3539 return child_range(); 3540 } 3541 return child_range(&Argument.Ex, &Argument.Ex + 1); 3542} 3543 3544// ObjCMessageExpr 3545Stmt::child_range ObjCMessageExpr::children() { 3546 Stmt **begin; 3547 if (getReceiverKind() == Instance) 3548 begin = reinterpret_cast<Stmt **>(this + 1); 3549 else 3550 begin = reinterpret_cast<Stmt **>(getArgs()); 3551 return child_range(begin, 3552 reinterpret_cast<Stmt **>(getArgs() + getNumArgs())); 3553} 3554 3555ObjCArrayLiteral::ObjCArrayLiteral(llvm::ArrayRef<Expr *> Elements, 3556 QualType T, ObjCMethodDecl *Method, 3557 SourceRange SR) 3558 : Expr(ObjCArrayLiteralClass, T, VK_RValue, OK_Ordinary, 3559 false, false, false, false), 3560 NumElements(Elements.size()), Range(SR), ArrayWithObjectsMethod(Method) 3561{ 3562 Expr **SaveElements = getElements(); 3563 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 3564 if (Elements[I]->isTypeDependent() || Elements[I]->isValueDependent()) 3565 ExprBits.ValueDependent = true; 3566 if (Elements[I]->isInstantiationDependent()) 3567 ExprBits.InstantiationDependent = true; 3568 if (Elements[I]->containsUnexpandedParameterPack()) 3569 ExprBits.ContainsUnexpandedParameterPack = true; 3570 3571 SaveElements[I] = Elements[I]; 3572 } 3573} 3574 3575ObjCArrayLiteral *ObjCArrayLiteral::Create(ASTContext &C, 3576 llvm::ArrayRef<Expr *> Elements, 3577 QualType T, ObjCMethodDecl * Method, 3578 SourceRange SR) { 3579 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3580 + Elements.size() * sizeof(Expr *)); 3581 return new (Mem) ObjCArrayLiteral(Elements, T, Method, SR); 3582} 3583 3584ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(ASTContext &C, 3585 unsigned NumElements) { 3586 3587 void *Mem = C.Allocate(sizeof(ObjCArrayLiteral) 3588 + NumElements * sizeof(Expr *)); 3589 return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements); 3590} 3591 3592ObjCDictionaryLiteral::ObjCDictionaryLiteral( 3593 ArrayRef<ObjCDictionaryElement> VK, 3594 bool HasPackExpansions, 3595 QualType T, ObjCMethodDecl *method, 3596 SourceRange SR) 3597 : Expr(ObjCDictionaryLiteralClass, T, VK_RValue, OK_Ordinary, false, false, 3598 false, false), 3599 NumElements(VK.size()), HasPackExpansions(HasPackExpansions), Range(SR), 3600 DictWithObjectsMethod(method) 3601{ 3602 KeyValuePair *KeyValues = getKeyValues(); 3603 ExpansionData *Expansions = getExpansionData(); 3604 for (unsigned I = 0; I < NumElements; I++) { 3605 if (VK[I].Key->isTypeDependent() || VK[I].Key->isValueDependent() || 3606 VK[I].Value->isTypeDependent() || VK[I].Value->isValueDependent()) 3607 ExprBits.ValueDependent = true; 3608 if (VK[I].Key->isInstantiationDependent() || 3609 VK[I].Value->isInstantiationDependent()) 3610 ExprBits.InstantiationDependent = true; 3611 if (VK[I].EllipsisLoc.isInvalid() && 3612 (VK[I].Key->containsUnexpandedParameterPack() || 3613 VK[I].Value->containsUnexpandedParameterPack())) 3614 ExprBits.ContainsUnexpandedParameterPack = true; 3615 3616 KeyValues[I].Key = VK[I].Key; 3617 KeyValues[I].Value = VK[I].Value; 3618 if (Expansions) { 3619 Expansions[I].EllipsisLoc = VK[I].EllipsisLoc; 3620 if (VK[I].NumExpansions) 3621 Expansions[I].NumExpansionsPlusOne = *VK[I].NumExpansions + 1; 3622 else 3623 Expansions[I].NumExpansionsPlusOne = 0; 3624 } 3625 } 3626} 3627 3628ObjCDictionaryLiteral * 3629ObjCDictionaryLiteral::Create(ASTContext &C, 3630 ArrayRef<ObjCDictionaryElement> VK, 3631 bool HasPackExpansions, 3632 QualType T, ObjCMethodDecl *method, 3633 SourceRange SR) { 3634 unsigned ExpansionsSize = 0; 3635 if (HasPackExpansions) 3636 ExpansionsSize = sizeof(ExpansionData) * VK.size(); 3637 3638 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3639 sizeof(KeyValuePair) * VK.size() + ExpansionsSize); 3640 return new (Mem) ObjCDictionaryLiteral(VK, HasPackExpansions, T, method, SR); 3641} 3642 3643ObjCDictionaryLiteral * 3644ObjCDictionaryLiteral::CreateEmpty(ASTContext &C, unsigned NumElements, 3645 bool HasPackExpansions) { 3646 unsigned ExpansionsSize = 0; 3647 if (HasPackExpansions) 3648 ExpansionsSize = sizeof(ExpansionData) * NumElements; 3649 void *Mem = C.Allocate(sizeof(ObjCDictionaryLiteral) + 3650 sizeof(KeyValuePair) * NumElements + ExpansionsSize); 3651 return new (Mem) ObjCDictionaryLiteral(EmptyShell(), NumElements, 3652 HasPackExpansions); 3653} 3654 3655ObjCSubscriptRefExpr *ObjCSubscriptRefExpr::Create(ASTContext &C, 3656 Expr *base, 3657 Expr *key, QualType T, 3658 ObjCMethodDecl *getMethod, 3659 ObjCMethodDecl *setMethod, 3660 SourceLocation RB) { 3661 void *Mem = C.Allocate(sizeof(ObjCSubscriptRefExpr)); 3662 return new (Mem) ObjCSubscriptRefExpr(base, key, T, VK_LValue, 3663 OK_ObjCSubscript, 3664 getMethod, setMethod, RB); 3665} 3666 3667AtomicExpr::AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, 3668 QualType t, AtomicOp op, SourceLocation RP) 3669 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 3670 false, false, false, false), 3671 NumSubExprs(nexpr), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) 3672{ 3673 assert(nexpr == getNumSubExprs(op) && "wrong number of subexpressions"); 3674 for (unsigned i = 0; i < nexpr; i++) { 3675 if (args[i]->isTypeDependent()) 3676 ExprBits.TypeDependent = true; 3677 if (args[i]->isValueDependent()) 3678 ExprBits.ValueDependent = true; 3679 if (args[i]->isInstantiationDependent()) 3680 ExprBits.InstantiationDependent = true; 3681 if (args[i]->containsUnexpandedParameterPack()) 3682 ExprBits.ContainsUnexpandedParameterPack = true; 3683 3684 SubExprs[i] = args[i]; 3685 } 3686} 3687 3688unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) { 3689 switch (Op) { 3690 case AO__c11_atomic_init: 3691 case AO__c11_atomic_load: 3692 case AO__atomic_load_n: 3693 return 2; 3694 3695 case AO__c11_atomic_store: 3696 case AO__c11_atomic_exchange: 3697 case AO__atomic_load: 3698 case AO__atomic_store: 3699 case AO__atomic_store_n: 3700 case AO__atomic_exchange_n: 3701 case AO__c11_atomic_fetch_add: 3702 case AO__c11_atomic_fetch_sub: 3703 case AO__c11_atomic_fetch_and: 3704 case AO__c11_atomic_fetch_or: 3705 case AO__c11_atomic_fetch_xor: 3706 case AO__atomic_fetch_add: 3707 case AO__atomic_fetch_sub: 3708 case AO__atomic_fetch_and: 3709 case AO__atomic_fetch_or: 3710 case AO__atomic_fetch_xor: 3711 case AO__atomic_fetch_nand: 3712 case AO__atomic_add_fetch: 3713 case AO__atomic_sub_fetch: 3714 case AO__atomic_and_fetch: 3715 case AO__atomic_or_fetch: 3716 case AO__atomic_xor_fetch: 3717 case AO__atomic_nand_fetch: 3718 return 3; 3719 3720 case AO__atomic_exchange: 3721 return 4; 3722 3723 case AO__c11_atomic_compare_exchange_strong: 3724 case AO__c11_atomic_compare_exchange_weak: 3725 return 5; 3726 3727 case AO__atomic_compare_exchange: 3728 case AO__atomic_compare_exchange_n: 3729 return 6; 3730 } 3731 llvm_unreachable("unknown atomic op"); 3732} 3733