1193326Sed//===--------------------- SemaLookup.cpp - Name Lookup ------------------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10193326Sed// This file implements name lookup for C, C++, Objective-C, and 11193326Sed// Objective-C++. 12193326Sed// 13193326Sed//===----------------------------------------------------------------------===// 14296417Sdim 15212904Sdim#include "clang/Sema/Lookup.h" 16193326Sed#include "clang/AST/ASTContext.h" 17288943Sdim#include "clang/AST/ASTMutationListener.h" 18198092Srdivacky#include "clang/AST/CXXInheritance.h" 19193326Sed#include "clang/AST/Decl.h" 20193326Sed#include "clang/AST/DeclCXX.h" 21234353Sdim#include "clang/AST/DeclLookups.h" 22193326Sed#include "clang/AST/DeclObjC.h" 23193326Sed#include "clang/AST/DeclTemplate.h" 24193326Sed#include "clang/AST/Expr.h" 25198092Srdivacky#include "clang/AST/ExprCXX.h" 26194179Sed#include "clang/Basic/Builtins.h" 27193326Sed#include "clang/Basic/LangOptions.h" 28288943Sdim#include "clang/Lex/HeaderSearch.h" 29276479Sdim#include "clang/Lex/ModuleLoader.h" 30288943Sdim#include "clang/Lex/Preprocessor.h" 31249423Sdim#include "clang/Sema/DeclSpec.h" 32249423Sdim#include "clang/Sema/ExternalSemaSource.h" 33249423Sdim#include "clang/Sema/Overload.h" 34249423Sdim#include "clang/Sema/Scope.h" 35249423Sdim#include "clang/Sema/ScopeInfo.h" 36249423Sdim#include "clang/Sema/Sema.h" 37249423Sdim#include "clang/Sema/SemaInternal.h" 38249423Sdim#include "clang/Sema/TemplateDeduction.h" 39249423Sdim#include "clang/Sema/TypoCorrection.h" 40249423Sdim#include "llvm/ADT/STLExtras.h" 41234353Sdim#include "llvm/ADT/SetVector.h" 42193326Sed#include "llvm/ADT/SmallPtrSet.h" 43218893Sdim#include "llvm/ADT/StringMap.h" 44226633Sdim#include "llvm/ADT/TinyPtrVector.h" 45234353Sdim#include "llvm/ADT/edit_distance.h" 46198092Srdivacky#include "llvm/Support/ErrorHandling.h" 47234353Sdim#include <algorithm> 48234353Sdim#include <iterator> 49218893Sdim#include <limits> 50201361Srdivacky#include <list> 51234353Sdim#include <map> 52193326Sed#include <set> 53234353Sdim#include <utility> 54193326Sed#include <vector> 55193326Sed 56193326Sedusing namespace clang; 57212904Sdimusing namespace sema; 58193326Sed 59199482Srdivackynamespace { 60199482Srdivacky class UnqualUsingEntry { 61199482Srdivacky const DeclContext *Nominated; 62199482Srdivacky const DeclContext *CommonAncestor; 63193326Sed 64199482Srdivacky public: 65199482Srdivacky UnqualUsingEntry(const DeclContext *Nominated, 66199482Srdivacky const DeclContext *CommonAncestor) 67199482Srdivacky : Nominated(Nominated), CommonAncestor(CommonAncestor) { 68199482Srdivacky } 69193326Sed 70199482Srdivacky const DeclContext *getCommonAncestor() const { 71199482Srdivacky return CommonAncestor; 72199482Srdivacky } 73193326Sed 74199482Srdivacky const DeclContext *getNominatedNamespace() const { 75199482Srdivacky return Nominated; 76199482Srdivacky } 77193326Sed 78199482Srdivacky // Sort by the pointer value of the common ancestor. 79199482Srdivacky struct Comparator { 80199482Srdivacky bool operator()(const UnqualUsingEntry &L, const UnqualUsingEntry &R) { 81199482Srdivacky return L.getCommonAncestor() < R.getCommonAncestor(); 82199482Srdivacky } 83193326Sed 84199482Srdivacky bool operator()(const UnqualUsingEntry &E, const DeclContext *DC) { 85199482Srdivacky return E.getCommonAncestor() < DC; 86199482Srdivacky } 87193326Sed 88199482Srdivacky bool operator()(const DeclContext *DC, const UnqualUsingEntry &E) { 89199482Srdivacky return DC < E.getCommonAncestor(); 90199482Srdivacky } 91199482Srdivacky }; 92199482Srdivacky }; 93193326Sed 94199482Srdivacky /// A collection of using directives, as used by C++ unqualified 95199482Srdivacky /// lookup. 96199482Srdivacky class UnqualUsingDirectiveSet { 97226633Sdim typedef SmallVector<UnqualUsingEntry, 8> ListTy; 98193326Sed 99199482Srdivacky ListTy list; 100199482Srdivacky llvm::SmallPtrSet<DeclContext*, 8> visited; 101193326Sed 102199482Srdivacky public: 103199482Srdivacky UnqualUsingDirectiveSet() {} 104193326Sed 105199482Srdivacky void visitScopeChain(Scope *S, Scope *InnermostFileScope) { 106218893Sdim // C++ [namespace.udir]p1: 107199482Srdivacky // During unqualified name lookup, the names appear as if they 108199482Srdivacky // were declared in the nearest enclosing namespace which contains 109199482Srdivacky // both the using-directive and the nominated namespace. 110261991Sdim DeclContext *InnermostFileDC = InnermostFileScope->getEntity(); 111199482Srdivacky assert(InnermostFileDC && InnermostFileDC->isFileContext()); 112193326Sed 113199482Srdivacky for (; S; S = S->getParent()) { 114234353Sdim // C++ [namespace.udir]p1: 115234353Sdim // A using-directive shall not appear in class scope, but may 116234353Sdim // appear in namespace scope or in block scope. 117261991Sdim DeclContext *Ctx = S->getEntity(); 118234353Sdim if (Ctx && Ctx->isFileContext()) { 119234353Sdim visit(Ctx, Ctx); 120234353Sdim } else if (!Ctx || Ctx->isFunctionOrMethod()) { 121276479Sdim for (auto *I : S->using_directives()) 122276479Sdim visit(I, InnermostFileDC); 123199482Srdivacky } 124199482Srdivacky } 125199482Srdivacky } 126193326Sed 127199482Srdivacky // Visits a context and collect all of its using directives 128199482Srdivacky // recursively. Treats all using directives as if they were 129199482Srdivacky // declared in the context. 130199482Srdivacky // 131199482Srdivacky // A given context is only every visited once, so it is important 132199482Srdivacky // that contexts be visited from the inside out in order to get 133199482Srdivacky // the effective DCs right. 134199482Srdivacky void visit(DeclContext *DC, DeclContext *EffectiveDC) { 135280031Sdim if (!visited.insert(DC).second) 136199482Srdivacky return; 137193326Sed 138199482Srdivacky addUsingDirectives(DC, EffectiveDC); 139199482Srdivacky } 140199482Srdivacky 141199482Srdivacky // Visits a using directive and collects all of its using 142199482Srdivacky // directives recursively. Treats all using directives as if they 143199482Srdivacky // were declared in the effective DC. 144199482Srdivacky void visit(UsingDirectiveDecl *UD, DeclContext *EffectiveDC) { 145199482Srdivacky DeclContext *NS = UD->getNominatedNamespace(); 146280031Sdim if (!visited.insert(NS).second) 147199482Srdivacky return; 148199482Srdivacky 149199482Srdivacky addUsingDirective(UD, EffectiveDC); 150199482Srdivacky addUsingDirectives(NS, EffectiveDC); 151199482Srdivacky } 152199482Srdivacky 153199482Srdivacky // Adds all the using directives in a context (and those nominated 154199482Srdivacky // by its using directives, transitively) as if they appeared in 155199482Srdivacky // the given effective context. 156199482Srdivacky void addUsingDirectives(DeclContext *DC, DeclContext *EffectiveDC) { 157296417Sdim SmallVector<DeclContext*, 4> queue; 158199482Srdivacky while (true) { 159276479Sdim for (auto UD : DC->using_directives()) { 160199482Srdivacky DeclContext *NS = UD->getNominatedNamespace(); 161280031Sdim if (visited.insert(NS).second) { 162199482Srdivacky addUsingDirective(UD, EffectiveDC); 163199482Srdivacky queue.push_back(NS); 164199482Srdivacky } 165199482Srdivacky } 166199482Srdivacky 167199482Srdivacky if (queue.empty()) 168199482Srdivacky return; 169199482Srdivacky 170261991Sdim DC = queue.pop_back_val(); 171193326Sed } 172193326Sed } 173199482Srdivacky 174199482Srdivacky // Add a using directive as if it had been declared in the given 175199482Srdivacky // context. This helps implement C++ [namespace.udir]p3: 176199482Srdivacky // The using-directive is transitive: if a scope contains a 177199482Srdivacky // using-directive that nominates a second namespace that itself 178199482Srdivacky // contains using-directives, the effect is as if the 179199482Srdivacky // using-directives from the second namespace also appeared in 180199482Srdivacky // the first. 181199482Srdivacky void addUsingDirective(UsingDirectiveDecl *UD, DeclContext *EffectiveDC) { 182199482Srdivacky // Find the common ancestor between the effective context and 183199482Srdivacky // the nominated namespace. 184199482Srdivacky DeclContext *Common = UD->getNominatedNamespace(); 185199482Srdivacky while (!Common->Encloses(EffectiveDC)) 186199482Srdivacky Common = Common->getParent(); 187199482Srdivacky Common = Common->getPrimaryContext(); 188218893Sdim 189199482Srdivacky list.push_back(UnqualUsingEntry(UD->getNominatedNamespace(), Common)); 190199482Srdivacky } 191199482Srdivacky 192199482Srdivacky void done() { 193199482Srdivacky std::sort(list.begin(), list.end(), UnqualUsingEntry::Comparator()); 194199482Srdivacky } 195199482Srdivacky 196199482Srdivacky typedef ListTy::const_iterator const_iterator; 197218893Sdim 198199482Srdivacky const_iterator begin() const { return list.begin(); } 199199482Srdivacky const_iterator end() const { return list.end(); } 200199482Srdivacky 201288943Sdim llvm::iterator_range<const_iterator> 202199482Srdivacky getNamespacesFor(DeclContext *DC) const { 203288943Sdim return llvm::make_range(std::equal_range(begin(), end(), 204288943Sdim DC->getPrimaryContext(), 205288943Sdim UnqualUsingEntry::Comparator())); 206199482Srdivacky } 207199482Srdivacky }; 208296417Sdim} // end anonymous namespace 209193326Sed 210193326Sed// Retrieve the set of identifier namespaces that correspond to a 211193326Sed// specific kind of name lookup. 212201361Srdivackystatic inline unsigned getIDNS(Sema::LookupNameKind NameKind, 213201361Srdivacky bool CPlusPlus, 214201361Srdivacky bool Redeclaration) { 215193326Sed unsigned IDNS = 0; 216193326Sed switch (NameKind) { 217224145Sdim case Sema::LookupObjCImplicitSelfParam: 218193326Sed case Sema::LookupOrdinaryName: 219193326Sed case Sema::LookupRedeclarationWithLinkage: 220261991Sdim case Sema::LookupLocalFriendName: 221193326Sed IDNS = Decl::IDNS_Ordinary; 222201361Srdivacky if (CPlusPlus) { 223207619Srdivacky IDNS |= Decl::IDNS_Tag | Decl::IDNS_Member | Decl::IDNS_Namespace; 224218893Sdim if (Redeclaration) 225218893Sdim IDNS |= Decl::IDNS_TagFriend | Decl::IDNS_OrdinaryFriend; 226201361Srdivacky } 227261991Sdim if (Redeclaration) 228261991Sdim IDNS |= Decl::IDNS_LocalExtern; 229193326Sed break; 230193326Sed 231207619Srdivacky case Sema::LookupOperatorName: 232207619Srdivacky // Operator lookup is its own crazy thing; it is not the same 233207619Srdivacky // as (e.g.) looking up an operator name for redeclaration. 234207619Srdivacky assert(!Redeclaration && "cannot do redeclaration operator lookup"); 235207619Srdivacky IDNS = Decl::IDNS_NonMemberOperator; 236207619Srdivacky break; 237207619Srdivacky 238193326Sed case Sema::LookupTagName: 239207619Srdivacky if (CPlusPlus) { 240207619Srdivacky IDNS = Decl::IDNS_Type; 241207619Srdivacky 242207619Srdivacky // When looking for a redeclaration of a tag name, we add: 243207619Srdivacky // 1) TagFriend to find undeclared friend decls 244207619Srdivacky // 2) Namespace because they can't "overload" with tag decls. 245207619Srdivacky // 3) Tag because it includes class templates, which can't 246207619Srdivacky // "overload" with tag decls. 247207619Srdivacky if (Redeclaration) 248207619Srdivacky IDNS |= Decl::IDNS_Tag | Decl::IDNS_TagFriend | Decl::IDNS_Namespace; 249207619Srdivacky } else { 250207619Srdivacky IDNS = Decl::IDNS_Tag; 251207619Srdivacky } 252193326Sed break; 253276479Sdim 254218893Sdim case Sema::LookupLabel: 255218893Sdim IDNS = Decl::IDNS_Label; 256218893Sdim break; 257276479Sdim 258193326Sed case Sema::LookupMemberName: 259193326Sed IDNS = Decl::IDNS_Member; 260193326Sed if (CPlusPlus) 261198092Srdivacky IDNS |= Decl::IDNS_Tag | Decl::IDNS_Ordinary; 262193326Sed break; 263193326Sed 264193326Sed case Sema::LookupNestedNameSpecifierName: 265207619Srdivacky IDNS = Decl::IDNS_Type | Decl::IDNS_Namespace; 266207619Srdivacky break; 267207619Srdivacky 268193326Sed case Sema::LookupNamespaceName: 269207619Srdivacky IDNS = Decl::IDNS_Namespace; 270193326Sed break; 271193326Sed 272200583Srdivacky case Sema::LookupUsingDeclName: 273276479Sdim assert(Redeclaration && "should only be used for redecl lookup"); 274276479Sdim IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Member | 275276479Sdim Decl::IDNS_Using | Decl::IDNS_TagFriend | Decl::IDNS_OrdinaryFriend | 276276479Sdim Decl::IDNS_LocalExtern; 277200583Srdivacky break; 278200583Srdivacky 279193326Sed case Sema::LookupObjCProtocolName: 280193326Sed IDNS = Decl::IDNS_ObjCProtocol; 281193326Sed break; 282218893Sdim 283212904Sdim case Sema::LookupAnyName: 284218893Sdim IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Member 285212904Sdim | Decl::IDNS_Using | Decl::IDNS_Namespace | Decl::IDNS_ObjCProtocol 286212904Sdim | Decl::IDNS_Type; 287212904Sdim break; 288193326Sed } 289193326Sed return IDNS; 290193326Sed} 291193326Sed 292201361Srdivackyvoid LookupResult::configure() { 293280031Sdim IDNS = getIDNS(LookupKind, getSema().getLangOpts().CPlusPlus, 294201361Srdivacky isForRedeclaration()); 295206084Srdivacky 296276479Sdim // If we're looking for one of the allocation or deallocation 297276479Sdim // operators, make sure that the implicitly-declared new and delete 298276479Sdim // operators can be found. 299276479Sdim switch (NameInfo.getName().getCXXOverloadedOperator()) { 300276479Sdim case OO_New: 301276479Sdim case OO_Delete: 302276479Sdim case OO_Array_New: 303276479Sdim case OO_Array_Delete: 304280031Sdim getSema().DeclareGlobalNewDelete(); 305276479Sdim break; 306206084Srdivacky 307276479Sdim default: 308276479Sdim break; 309276479Sdim } 310249423Sdim 311276479Sdim // Compiler builtins are always visible, regardless of where they end 312276479Sdim // up being declared. 313276479Sdim if (IdentifierInfo *Id = NameInfo.getName().getAsIdentifierInfo()) { 314276479Sdim if (unsigned BuiltinID = Id->getBuiltinID()) { 315280031Sdim if (!getSema().Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) 316276479Sdim AllowHidden = true; 317249423Sdim } 318206084Srdivacky } 319201361Srdivacky} 320201361Srdivacky 321276479Sdimbool LookupResult::sanity() const { 322276479Sdim // This function is never called by NDEBUG builds. 323212904Sdim assert(ResultKind != NotFound || Decls.size() == 0); 324212904Sdim assert(ResultKind != Found || Decls.size() == 1); 325212904Sdim assert(ResultKind != FoundOverloaded || Decls.size() > 1 || 326212904Sdim (Decls.size() == 1 && 327212904Sdim isa<FunctionTemplateDecl>((*begin())->getUnderlyingDecl()))); 328212904Sdim assert(ResultKind != FoundUnresolvedValue || sanityCheckUnresolved()); 329212904Sdim assert(ResultKind != Ambiguous || Decls.size() > 1 || 330218893Sdim (Decls.size() == 1 && (Ambiguity == AmbiguousBaseSubobjects || 331218893Sdim Ambiguity == AmbiguousBaseSubobjectTypes))); 332276479Sdim assert((Paths != nullptr) == (ResultKind == Ambiguous && 333276479Sdim (Ambiguity == AmbiguousBaseSubobjectTypes || 334276479Sdim Ambiguity == AmbiguousBaseSubobjects))); 335276479Sdim return true; 336212904Sdim} 337212904Sdim 338198092Srdivacky// Necessary because CXXBasePaths is not complete in Sema.h 339199482Srdivackyvoid LookupResult::deletePaths(CXXBasePaths *Paths) { 340198092Srdivacky delete Paths; 341193326Sed} 342193326Sed 343261991Sdim/// Get a representative context for a declaration such that two declarations 344261991Sdim/// will have the same context if they were found within the same scope. 345261991Sdimstatic DeclContext *getContextForScopeMatching(Decl *D) { 346261991Sdim // For function-local declarations, use that function as the context. This 347261991Sdim // doesn't account for scopes within the function; the caller must deal with 348261991Sdim // those. 349261991Sdim DeclContext *DC = D->getLexicalDeclContext(); 350261991Sdim if (DC->isFunctionOrMethod()) 351261991Sdim return DC; 352234353Sdim 353261991Sdim // Otherwise, look at the semantic context of the declaration. The 354261991Sdim // declaration must have been found there. 355261991Sdim return D->getDeclContext()->getRedeclContext(); 356234353Sdim} 357234353Sdim 358296417Sdim/// \brief Determine whether \p D is a better lookup result than \p Existing, 359296417Sdim/// given that they declare the same entity. 360296417Sdimstatic bool isPreferredLookupResult(Sema &S, Sema::LookupNameKind Kind, 361296417Sdim NamedDecl *D, NamedDecl *Existing) { 362296417Sdim // When looking up redeclarations of a using declaration, prefer a using 363296417Sdim // shadow declaration over any other declaration of the same entity. 364296417Sdim if (Kind == Sema::LookupUsingDeclName && isa<UsingShadowDecl>(D) && 365296417Sdim !isa<UsingShadowDecl>(Existing)) 366296417Sdim return true; 367296417Sdim 368296417Sdim auto *DUnderlying = D->getUnderlyingDecl(); 369296417Sdim auto *EUnderlying = Existing->getUnderlyingDecl(); 370296417Sdim 371296417Sdim // If they have different underlying declarations, prefer a typedef over the 372296417Sdim // original type (this happens when two type declarations denote the same 373296417Sdim // type), per a generous reading of C++ [dcl.typedef]p3 and p4. The typedef 374296417Sdim // might carry additional semantic information, such as an alignment override. 375296417Sdim // However, per C++ [dcl.typedef]p5, when looking up a tag name, prefer a tag 376296417Sdim // declaration over a typedef. 377296417Sdim if (DUnderlying->getCanonicalDecl() != EUnderlying->getCanonicalDecl()) { 378296417Sdim assert(isa<TypeDecl>(DUnderlying) && isa<TypeDecl>(EUnderlying)); 379296417Sdim bool HaveTag = isa<TagDecl>(EUnderlying); 380296417Sdim bool WantTag = Kind == Sema::LookupTagName; 381296417Sdim return HaveTag != WantTag; 382296417Sdim } 383296417Sdim 384296417Sdim // Pick the function with more default arguments. 385296417Sdim // FIXME: In the presence of ambiguous default arguments, we should keep both, 386296417Sdim // so we can diagnose the ambiguity if the default argument is needed. 387296417Sdim // See C++ [over.match.best]p3. 388296417Sdim if (auto *DFD = dyn_cast<FunctionDecl>(DUnderlying)) { 389296417Sdim auto *EFD = cast<FunctionDecl>(EUnderlying); 390296417Sdim unsigned DMin = DFD->getMinRequiredArguments(); 391296417Sdim unsigned EMin = EFD->getMinRequiredArguments(); 392296417Sdim // If D has more default arguments, it is preferred. 393296417Sdim if (DMin != EMin) 394296417Sdim return DMin < EMin; 395296417Sdim // FIXME: When we track visibility for default function arguments, check 396296417Sdim // that we pick the declaration with more visible default arguments. 397296417Sdim } 398296417Sdim 399296417Sdim // Pick the template with more default template arguments. 400296417Sdim if (auto *DTD = dyn_cast<TemplateDecl>(DUnderlying)) { 401296417Sdim auto *ETD = cast<TemplateDecl>(EUnderlying); 402296417Sdim unsigned DMin = DTD->getTemplateParameters()->getMinRequiredArguments(); 403296417Sdim unsigned EMin = ETD->getTemplateParameters()->getMinRequiredArguments(); 404296417Sdim // If D has more default arguments, it is preferred. Note that default 405296417Sdim // arguments (and their visibility) is monotonically increasing across the 406296417Sdim // redeclaration chain, so this is a quick proxy for "is more recent". 407296417Sdim if (DMin != EMin) 408296417Sdim return DMin < EMin; 409296417Sdim // If D has more *visible* default arguments, it is preferred. Note, an 410296417Sdim // earlier default argument being visible does not imply that a later 411296417Sdim // default argument is visible, so we can't just check the first one. 412296417Sdim for (unsigned I = DMin, N = DTD->getTemplateParameters()->size(); 413296417Sdim I != N; ++I) { 414296417Sdim if (!S.hasVisibleDefaultArgument( 415296417Sdim ETD->getTemplateParameters()->getParam(I)) && 416296417Sdim S.hasVisibleDefaultArgument( 417296417Sdim DTD->getTemplateParameters()->getParam(I))) 418296417Sdim return true; 419296417Sdim } 420296417Sdim } 421296417Sdim 422296417Sdim // For most kinds of declaration, it doesn't really matter which one we pick. 423296417Sdim if (!isa<FunctionDecl>(DUnderlying) && !isa<VarDecl>(DUnderlying)) { 424296417Sdim // If the existing declaration is hidden, prefer the new one. Otherwise, 425296417Sdim // keep what we've got. 426296417Sdim return !S.isVisible(Existing); 427296417Sdim } 428296417Sdim 429296417Sdim // Pick the newer declaration; it might have a more precise type. 430296417Sdim for (Decl *Prev = DUnderlying->getPreviousDecl(); Prev; 431296417Sdim Prev = Prev->getPreviousDecl()) 432296417Sdim if (Prev == EUnderlying) 433296417Sdim return true; 434296417Sdim return false; 435296417Sdim 436296417Sdim // If the existing declaration is hidden, prefer the new one. Otherwise, 437296417Sdim // keep what we've got. 438296417Sdim return !S.isVisible(Existing); 439296417Sdim} 440296417Sdim 441296417Sdim/// Determine whether \p D can hide a tag declaration. 442296417Sdimstatic bool canHideTag(NamedDecl *D) { 443296417Sdim // C++ [basic.scope.declarative]p4: 444296417Sdim // Given a set of declarations in a single declarative region [...] 445296417Sdim // exactly one declaration shall declare a class name or enumeration name 446296417Sdim // that is not a typedef name and the other declarations shall all refer to 447296417Sdim // the same variable or enumerator, or all refer to functions and function 448296417Sdim // templates; in this case the class name or enumeration name is hidden. 449296417Sdim // C++ [basic.scope.hiding]p2: 450296417Sdim // A class name or enumeration name can be hidden by the name of a 451296417Sdim // variable, data member, function, or enumerator declared in the same 452296417Sdim // scope. 453296417Sdim D = D->getUnderlyingDecl(); 454296417Sdim return isa<VarDecl>(D) || isa<EnumConstantDecl>(D) || isa<FunctionDecl>(D) || 455296417Sdim isa<FunctionTemplateDecl>(D) || isa<FieldDecl>(D); 456296417Sdim} 457296417Sdim 458199990Srdivacky/// Resolves the result kind of this lookup. 459199482Srdivackyvoid LookupResult::resolveKind() { 460198092Srdivacky unsigned N = Decls.size(); 461218893Sdim 462198092Srdivacky // Fast case: no possible ambiguity. 463199512Srdivacky if (N == 0) { 464296417Sdim assert(ResultKind == NotFound || 465296417Sdim ResultKind == NotFoundInCurrentInstantiation); 466199512Srdivacky return; 467199512Srdivacky } 468199512Srdivacky 469199990Srdivacky // If there's a single decl, we need to examine it to decide what 470199990Srdivacky // kind of lookup this is. 471199482Srdivacky if (N == 1) { 472207619Srdivacky NamedDecl *D = (*Decls.begin())->getUnderlyingDecl(); 473207619Srdivacky if (isa<FunctionTemplateDecl>(D)) 474199990Srdivacky ResultKind = FoundOverloaded; 475207619Srdivacky else if (isa<UnresolvedUsingValueDecl>(D)) 476199482Srdivacky ResultKind = FoundUnresolvedValue; 477199482Srdivacky return; 478199482Srdivacky } 479193326Sed 480198092Srdivacky // Don't do any extra resolution if we've already resolved as ambiguous. 481199482Srdivacky if (ResultKind == Ambiguous) return; 482195099Sed 483296417Sdim llvm::SmallDenseMap<NamedDecl*, unsigned, 16> Unique; 484296417Sdim llvm::SmallDenseMap<QualType, unsigned, 16> UniqueTypes; 485218893Sdim 486198092Srdivacky bool Ambiguous = false; 487296417Sdim bool HasTag = false, HasFunction = false; 488199990Srdivacky bool HasFunctionTemplate = false, HasUnresolved = false; 489296417Sdim NamedDecl *HasNonFunction = nullptr; 490193326Sed 491296417Sdim llvm::SmallVector<NamedDecl*, 4> EquivalentNonFunctions; 492296417Sdim 493198092Srdivacky unsigned UniqueTagIndex = 0; 494218893Sdim 495198092Srdivacky unsigned I = 0; 496198092Srdivacky while (I < N) { 497199482Srdivacky NamedDecl *D = Decls[I]->getUnderlyingDecl(); 498199482Srdivacky D = cast<NamedDecl>(D->getCanonicalDecl()); 499198092Srdivacky 500249423Sdim // Ignore an invalid declaration unless it's the only one left. 501296417Sdim if (D->isInvalidDecl() && !(I == 0 && N == 1)) { 502249423Sdim Decls[I] = Decls[--N]; 503249423Sdim continue; 504249423Sdim } 505249423Sdim 506296417Sdim llvm::Optional<unsigned> ExistingI; 507296417Sdim 508212904Sdim // Redeclarations of types via typedef can occur both within a scope 509212904Sdim // and, through using declarations and directives, across scopes. There is 510212904Sdim // no ambiguity if they all refer to the same type, so unique based on the 511212904Sdim // canonical type. 512212904Sdim if (TypeDecl *TD = dyn_cast<TypeDecl>(D)) { 513296417Sdim QualType T = getSema().Context.getTypeDeclType(TD); 514296417Sdim auto UniqueResult = UniqueTypes.insert( 515296417Sdim std::make_pair(getSema().Context.getCanonicalType(T), I)); 516296417Sdim if (!UniqueResult.second) { 517296417Sdim // The type is not unique. 518296417Sdim ExistingI = UniqueResult.first->second; 519212904Sdim } 520212904Sdim } 521218893Sdim 522296417Sdim // For non-type declarations, check for a prior lookup result naming this 523296417Sdim // canonical declaration. 524296417Sdim if (!ExistingI) { 525296417Sdim auto UniqueResult = Unique.insert(std::make_pair(D, I)); 526296417Sdim if (!UniqueResult.second) { 527296417Sdim // We've seen this entity before. 528296417Sdim ExistingI = UniqueResult.first->second; 529296417Sdim } 530296417Sdim } 531296417Sdim 532296417Sdim if (ExistingI) { 533296417Sdim // This is not a unique lookup result. Pick one of the results and 534296417Sdim // discard the other. 535296417Sdim if (isPreferredLookupResult(getSema(), getLookupKind(), Decls[I], 536296417Sdim Decls[*ExistingI])) 537296417Sdim Decls[*ExistingI] = Decls[I]; 538198092Srdivacky Decls[I] = Decls[--N]; 539212904Sdim continue; 540218893Sdim } 541218893Sdim 542212904Sdim // Otherwise, do some decl type analysis and then continue. 543212904Sdim 544212904Sdim if (isa<UnresolvedUsingValueDecl>(D)) { 545212904Sdim HasUnresolved = true; 546212904Sdim } else if (isa<TagDecl>(D)) { 547212904Sdim if (HasTag) 548212904Sdim Ambiguous = true; 549212904Sdim UniqueTagIndex = I; 550212904Sdim HasTag = true; 551212904Sdim } else if (isa<FunctionTemplateDecl>(D)) { 552212904Sdim HasFunction = true; 553212904Sdim HasFunctionTemplate = true; 554212904Sdim } else if (isa<FunctionDecl>(D)) { 555212904Sdim HasFunction = true; 556198092Srdivacky } else { 557296417Sdim if (HasNonFunction) { 558296417Sdim // If we're about to create an ambiguity between two declarations that 559296417Sdim // are equivalent, but one is an internal linkage declaration from one 560296417Sdim // module and the other is an internal linkage declaration from another 561296417Sdim // module, just skip it. 562296417Sdim if (getSema().isEquivalentInternalLinkageDeclaration(HasNonFunction, 563296417Sdim D)) { 564296417Sdim EquivalentNonFunctions.push_back(D); 565296417Sdim Decls[I] = Decls[--N]; 566296417Sdim continue; 567296417Sdim } 568296417Sdim 569212904Sdim Ambiguous = true; 570296417Sdim } 571296417Sdim HasNonFunction = D; 572193326Sed } 573212904Sdim I++; 574193326Sed } 575193326Sed 576198092Srdivacky // C++ [basic.scope.hiding]p2: 577198092Srdivacky // A class name or enumeration name can be hidden by the name of 578198092Srdivacky // an object, function, or enumerator declared in the same 579198092Srdivacky // scope. If a class or enumeration name and an object, function, 580198092Srdivacky // or enumerator are declared in the same scope (in any order) 581198092Srdivacky // with the same name, the class or enumeration name is hidden 582198092Srdivacky // wherever the object, function, or enumerator name is visible. 583198092Srdivacky // But it's still an error if there are distinct tag types found, 584198092Srdivacky // even if they're not visible. (ref?) 585296417Sdim if (N > 1 && HideTags && HasTag && !Ambiguous && 586218893Sdim (HasFunction || HasNonFunction || HasUnresolved)) { 587296417Sdim NamedDecl *OtherDecl = Decls[UniqueTagIndex ? 0 : N - 1]; 588296417Sdim if (isa<TagDecl>(Decls[UniqueTagIndex]->getUnderlyingDecl()) && 589296417Sdim getContextForScopeMatching(Decls[UniqueTagIndex])->Equals( 590296417Sdim getContextForScopeMatching(OtherDecl)) && 591296417Sdim canHideTag(OtherDecl)) 592218893Sdim Decls[UniqueTagIndex] = Decls[--N]; 593218893Sdim else 594218893Sdim Ambiguous = true; 595218893Sdim } 596193326Sed 597296417Sdim // FIXME: This diagnostic should really be delayed until we're done with 598296417Sdim // the lookup result, in case the ambiguity is resolved by the caller. 599296417Sdim if (!EquivalentNonFunctions.empty() && !Ambiguous) 600296417Sdim getSema().diagnoseEquivalentInternalLinkageDeclarations( 601296417Sdim getNameLoc(), HasNonFunction, EquivalentNonFunctions); 602296417Sdim 603198092Srdivacky Decls.set_size(N); 604193326Sed 605200583Srdivacky if (HasNonFunction && (HasFunction || HasUnresolved)) 606198092Srdivacky Ambiguous = true; 607193326Sed 608198092Srdivacky if (Ambiguous) 609198092Srdivacky setAmbiguous(LookupResult::AmbiguousReference); 610199482Srdivacky else if (HasUnresolved) 611199482Srdivacky ResultKind = LookupResult::FoundUnresolvedValue; 612199990Srdivacky else if (N > 1 || HasFunctionTemplate) 613199482Srdivacky ResultKind = LookupResult::FoundOverloaded; 614198092Srdivacky else 615199482Srdivacky ResultKind = LookupResult::Found; 616193326Sed} 617193326Sed 618199482Srdivackyvoid LookupResult::addDeclsFromBasePaths(const CXXBasePaths &P) { 619203955Srdivacky CXXBasePaths::const_paths_iterator I, E; 620198092Srdivacky for (I = P.begin(), E = P.end(); I != E; ++I) 621249423Sdim for (DeclContext::lookup_iterator DI = I->Decls.begin(), 622249423Sdim DE = I->Decls.end(); DI != DE; ++DI) 623198092Srdivacky addDecl(*DI); 624193326Sed} 625193326Sed 626199482Srdivackyvoid LookupResult::setAmbiguousBaseSubobjects(CXXBasePaths &P) { 627198092Srdivacky Paths = new CXXBasePaths; 628198092Srdivacky Paths->swap(P); 629198092Srdivacky addDeclsFromBasePaths(*Paths); 630198092Srdivacky resolveKind(); 631198092Srdivacky setAmbiguous(AmbiguousBaseSubobjects); 632193326Sed} 633193326Sed 634199482Srdivackyvoid LookupResult::setAmbiguousBaseSubobjectTypes(CXXBasePaths &P) { 635198092Srdivacky Paths = new CXXBasePaths; 636198092Srdivacky Paths->swap(P); 637198092Srdivacky addDeclsFromBasePaths(*Paths); 638198092Srdivacky resolveKind(); 639198092Srdivacky setAmbiguous(AmbiguousBaseSubobjectTypes); 640193326Sed} 641193326Sed 642226633Sdimvoid LookupResult::print(raw_ostream &Out) { 643198092Srdivacky Out << Decls.size() << " result(s)"; 644198092Srdivacky if (isAmbiguous()) Out << ", ambiguous"; 645198092Srdivacky if (Paths) Out << ", base paths present"; 646218893Sdim 647198092Srdivacky for (iterator I = begin(), E = end(); I != E; ++I) { 648198092Srdivacky Out << "\n"; 649198092Srdivacky (*I)->print(Out, 2); 650193326Sed } 651193326Sed} 652193326Sed 653296417SdimLLVM_DUMP_METHOD void LookupResult::dump() { 654296417Sdim llvm::errs() << "lookup results for " << getLookupName().getAsString() 655296417Sdim << ":\n"; 656296417Sdim for (NamedDecl *D : *this) 657296417Sdim D->dump(); 658296417Sdim} 659296417Sdim 660203955Srdivacky/// \brief Lookup a builtin function, when name lookup would otherwise 661203955Srdivacky/// fail. 662203955Srdivackystatic bool LookupBuiltin(Sema &S, LookupResult &R) { 663203955Srdivacky Sema::LookupNameKind NameKind = R.getLookupKind(); 664203955Srdivacky 665203955Srdivacky // If we didn't find a use of this identifier, and if the identifier 666203955Srdivacky // corresponds to a compiler builtin, create the decl object for the builtin 667203955Srdivacky // now, injecting it into translation unit scope, and return it. 668203955Srdivacky if (NameKind == Sema::LookupOrdinaryName || 669203955Srdivacky NameKind == Sema::LookupRedeclarationWithLinkage) { 670203955Srdivacky IdentifierInfo *II = R.getLookupName().getAsIdentifierInfo(); 671203955Srdivacky if (II) { 672261991Sdim if (S.getLangOpts().CPlusPlus11 && S.getLangOpts().GNUMode && 673261991Sdim II == S.getFloat128Identifier()) { 674261991Sdim // libstdc++4.7's type_traits expects type __float128 to exist, so 675261991Sdim // insert a dummy type to make that header build in gnu++11 mode. 676261991Sdim R.addDecl(S.getASTContext().getFloat128StubType()); 677261991Sdim return true; 678261991Sdim } 679296417Sdim if (S.getLangOpts().CPlusPlus && NameKind == Sema::LookupOrdinaryName && 680296417Sdim II == S.getASTContext().getMakeIntegerSeqName()) { 681296417Sdim R.addDecl(S.getASTContext().getMakeIntegerSeqDecl()); 682296417Sdim return true; 683296417Sdim } 684261991Sdim 685203955Srdivacky // If this is a builtin on this (or all) targets, create the decl. 686203955Srdivacky if (unsigned BuiltinID = II->getBuiltinID()) { 687203955Srdivacky // In C++, we don't have any predefined library functions like 688203955Srdivacky // 'malloc'. Instead, we'll just error. 689234353Sdim if (S.getLangOpts().CPlusPlus && 690203955Srdivacky S.Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) 691203955Srdivacky return false; 692203955Srdivacky 693218893Sdim if (NamedDecl *D = S.LazilyCreateBuiltin((IdentifierInfo *)II, 694218893Sdim BuiltinID, S.TUScope, 695218893Sdim R.isForRedeclaration(), 696218893Sdim R.getNameLoc())) { 697203955Srdivacky R.addDecl(D); 698218893Sdim return true; 699218893Sdim } 700203955Srdivacky } 701203955Srdivacky } 702203955Srdivacky } 703203955Srdivacky 704203955Srdivacky return false; 705203955Srdivacky} 706203955Srdivacky 707210299Sed/// \brief Determine whether we can declare a special member function within 708210299Sed/// the class at this point. 709249423Sdimstatic bool CanDeclareSpecialMemberFunction(const CXXRecordDecl *Class) { 710210299Sed // We need to have a definition for the class. 711210299Sed if (!Class->getDefinition() || Class->isDependentContext()) 712210299Sed return false; 713218893Sdim 714210299Sed // We can't be in the middle of defining the class. 715249423Sdim return !Class->isBeingDefined(); 716210299Sed} 717210299Sed 718210299Sedvoid Sema::ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class) { 719249423Sdim if (!CanDeclareSpecialMemberFunction(Class)) 720210299Sed return; 721210299Sed 722210299Sed // If the default constructor has not yet been declared, do so now. 723223017Sdim if (Class->needsImplicitDefaultConstructor()) 724210299Sed DeclareImplicitDefaultConstructor(Class); 725218893Sdim 726210299Sed // If the copy constructor has not yet been declared, do so now. 727249423Sdim if (Class->needsImplicitCopyConstructor()) 728210299Sed DeclareImplicitCopyConstructor(Class); 729218893Sdim 730210299Sed // If the copy assignment operator has not yet been declared, do so now. 731249423Sdim if (Class->needsImplicitCopyAssignment()) 732210299Sed DeclareImplicitCopyAssignment(Class); 733210299Sed 734249423Sdim if (getLangOpts().CPlusPlus11) { 735226633Sdim // If the move constructor has not yet been declared, do so now. 736226633Sdim if (Class->needsImplicitMoveConstructor()) 737226633Sdim DeclareImplicitMoveConstructor(Class); // might not actually do it 738226633Sdim 739226633Sdim // If the move assignment operator has not yet been declared, do so now. 740226633Sdim if (Class->needsImplicitMoveAssignment()) 741226633Sdim DeclareImplicitMoveAssignment(Class); // might not actually do it 742226633Sdim } 743226633Sdim 744210299Sed // If the destructor has not yet been declared, do so now. 745249423Sdim if (Class->needsImplicitDestructor()) 746218893Sdim DeclareImplicitDestructor(Class); 747210299Sed} 748210299Sed 749218893Sdim/// \brief Determine whether this is the name of an implicitly-declared 750210299Sed/// special member function. 751210299Sedstatic bool isImplicitlyDeclaredMemberFunctionName(DeclarationName Name) { 752210299Sed switch (Name.getNameKind()) { 753210299Sed case DeclarationName::CXXConstructorName: 754210299Sed case DeclarationName::CXXDestructorName: 755210299Sed return true; 756218893Sdim 757210299Sed case DeclarationName::CXXOperatorName: 758210299Sed return Name.getCXXOverloadedOperator() == OO_Equal; 759218893Sdim 760210299Sed default: 761218893Sdim break; 762210299Sed } 763218893Sdim 764210299Sed return false; 765210299Sed} 766210299Sed 767210299Sed/// \brief If there are any implicit member functions with the given name 768210299Sed/// that need to be declared in the given declaration context, do so. 769218893Sdimstatic void DeclareImplicitMemberFunctionsWithName(Sema &S, 770210299Sed DeclarationName Name, 771210299Sed const DeclContext *DC) { 772210299Sed if (!DC) 773210299Sed return; 774218893Sdim 775210299Sed switch (Name.getNameKind()) { 776210299Sed case DeclarationName::CXXConstructorName: 777210299Sed if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 778249423Sdim if (Record->getDefinition() && CanDeclareSpecialMemberFunction(Record)) { 779226633Sdim CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(Record); 780223017Sdim if (Record->needsImplicitDefaultConstructor()) 781226633Sdim S.DeclareImplicitDefaultConstructor(Class); 782249423Sdim if (Record->needsImplicitCopyConstructor()) 783226633Sdim S.DeclareImplicitCopyConstructor(Class); 784249423Sdim if (S.getLangOpts().CPlusPlus11 && 785226633Sdim Record->needsImplicitMoveConstructor()) 786226633Sdim S.DeclareImplicitMoveConstructor(Class); 787210299Sed } 788210299Sed break; 789218893Sdim 790210299Sed case DeclarationName::CXXDestructorName: 791210299Sed if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 792249423Sdim if (Record->getDefinition() && Record->needsImplicitDestructor() && 793249423Sdim CanDeclareSpecialMemberFunction(Record)) 794210299Sed S.DeclareImplicitDestructor(const_cast<CXXRecordDecl *>(Record)); 795210299Sed break; 796218893Sdim 797210299Sed case DeclarationName::CXXOperatorName: 798210299Sed if (Name.getCXXOverloadedOperator() != OO_Equal) 799210299Sed break; 800218893Sdim 801226633Sdim if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) { 802249423Sdim if (Record->getDefinition() && CanDeclareSpecialMemberFunction(Record)) { 803226633Sdim CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(Record); 804249423Sdim if (Record->needsImplicitCopyAssignment()) 805226633Sdim S.DeclareImplicitCopyAssignment(Class); 806249423Sdim if (S.getLangOpts().CPlusPlus11 && 807226633Sdim Record->needsImplicitMoveAssignment()) 808226633Sdim S.DeclareImplicitMoveAssignment(Class); 809226633Sdim } 810226633Sdim } 811210299Sed break; 812218893Sdim 813210299Sed default: 814218893Sdim break; 815210299Sed } 816210299Sed} 817210299Sed 818198092Srdivacky// Adds all qualifying matches for a name within a decl context to the 819198092Srdivacky// given lookup result. Returns true if any matches were found. 820203955Srdivackystatic bool LookupDirect(Sema &S, LookupResult &R, const DeclContext *DC) { 821198092Srdivacky bool Found = false; 822193326Sed 823210299Sed // Lazily declare C++ special member functions. 824234353Sdim if (S.getLangOpts().CPlusPlus) 825210299Sed DeclareImplicitMemberFunctionsWithName(S, R.getLookupName(), DC); 826218893Sdim 827210299Sed // Perform lookup into this declaration context. 828288943Sdim DeclContext::lookup_result DR = DC->lookup(R.getLookupName()); 829288943Sdim for (DeclContext::lookup_iterator I = DR.begin(), E = DR.end(); I != E; 830249423Sdim ++I) { 831202879Srdivacky NamedDecl *D = *I; 832234353Sdim if ((D = R.getAcceptableDecl(D))) { 833202879Srdivacky R.addDecl(D); 834202379Srdivacky Found = true; 835202379Srdivacky } 836202379Srdivacky } 837193326Sed 838203955Srdivacky if (!Found && DC->isTranslationUnit() && LookupBuiltin(S, R)) 839203955Srdivacky return true; 840203955Srdivacky 841202379Srdivacky if (R.getLookupName().getNameKind() 842203955Srdivacky != DeclarationName::CXXConversionFunctionName || 843203955Srdivacky R.getLookupName().getCXXNameType()->isDependentType() || 844203955Srdivacky !isa<CXXRecordDecl>(DC)) 845203955Srdivacky return Found; 846202379Srdivacky 847203955Srdivacky // C++ [temp.mem]p6: 848218893Sdim // A specialization of a conversion function template is not found by 849203955Srdivacky // name lookup. Instead, any conversion function templates visible in the 850203955Srdivacky // context of the use are considered. [...] 851203955Srdivacky const CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 852226633Sdim if (!Record->isCompleteDefinition()) 853203955Srdivacky return Found; 854202379Srdivacky 855249423Sdim for (CXXRecordDecl::conversion_iterator U = Record->conversion_begin(), 856249423Sdim UEnd = Record->conversion_end(); U != UEnd; ++U) { 857203955Srdivacky FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(*U); 858203955Srdivacky if (!ConvTemplate) 859203955Srdivacky continue; 860218893Sdim 861203955Srdivacky // When we're performing lookup for the purposes of redeclaration, just 862218893Sdim // add the conversion function template. When we deduce template 863218893Sdim // arguments for specializations, we'll end up unifying the return 864203955Srdivacky // type of the new declaration with the type of the function template. 865203955Srdivacky if (R.isForRedeclaration()) { 866203955Srdivacky R.addDecl(ConvTemplate); 867203955Srdivacky Found = true; 868203955Srdivacky continue; 869202379Srdivacky } 870218893Sdim 871203955Srdivacky // C++ [temp.mem]p6: 872218893Sdim // [...] For each such operator, if argument deduction succeeds 873218893Sdim // (14.9.2.3), the resulting specialization is used as if found by 874203955Srdivacky // name lookup. 875203955Srdivacky // 876203955Srdivacky // When referencing a conversion function for any purpose other than 877203955Srdivacky // a redeclaration (such that we'll be building an expression with the 878218893Sdim // result), perform template argument deduction and place the 879203955Srdivacky // specialization into the result set. We do this to avoid forcing all 880203955Srdivacky // callers to perform special deduction for conversion functions. 881243830Sdim TemplateDeductionInfo Info(R.getNameLoc()); 882276479Sdim FunctionDecl *Specialization = nullptr; 883218893Sdim 884218893Sdim const FunctionProtoType *ConvProto 885203955Srdivacky = ConvTemplate->getTemplatedDecl()->getType()->getAs<FunctionProtoType>(); 886203955Srdivacky assert(ConvProto && "Nonsensical conversion function template type"); 887203955Srdivacky 888203955Srdivacky // Compute the type of the function that we would expect the conversion 889203955Srdivacky // function to have, if it were to match the name given. 890203955Srdivacky // FIXME: Calling convention! 891218893Sdim FunctionProtoType::ExtProtoInfo EPI = ConvProto->getExtProtoInfo(); 892261991Sdim EPI.ExtInfo = EPI.ExtInfo.withCallingConv(CC_C); 893280031Sdim EPI.ExceptionSpec = EST_None; 894203955Srdivacky QualType ExpectedType 895203955Srdivacky = R.getSema().Context.getFunctionType(R.getLookupName().getCXXNameType(), 896251662Sdim None, EPI); 897218893Sdim 898203955Srdivacky // Perform template argument deduction against the type that we would 899203955Srdivacky // expect the function to have. 900276479Sdim if (R.getSema().DeduceTemplateArguments(ConvTemplate, nullptr, ExpectedType, 901203955Srdivacky Specialization, Info) 902203955Srdivacky == Sema::TDK_Success) { 903203955Srdivacky R.addDecl(Specialization); 904203955Srdivacky Found = true; 905203955Srdivacky } 906202379Srdivacky } 907203955Srdivacky 908198092Srdivacky return Found; 909193326Sed} 910193326Sed 911199482Srdivacky// Performs C++ unqualified lookup into the given file context. 912198092Srdivackystatic bool 913218893SdimCppNamespaceLookup(Sema &S, LookupResult &R, ASTContext &Context, 914203955Srdivacky DeclContext *NS, UnqualUsingDirectiveSet &UDirs) { 915193326Sed 916193326Sed assert(NS && NS->isFileContext() && "CppNamespaceLookup() requires namespace!"); 917193326Sed 918199482Srdivacky // Perform direct name lookup into the LookupCtx. 919203955Srdivacky bool Found = LookupDirect(S, R, NS); 920193326Sed 921199482Srdivacky // Perform direct name lookup into the namespaces nominated by the 922199482Srdivacky // using directives whose common ancestor is this namespace. 923288943Sdim for (const UnqualUsingEntry &UUE : UDirs.getNamespacesFor(NS)) 924288943Sdim if (LookupDirect(S, R, UUE.getNominatedNamespace())) 925199482Srdivacky Found = true; 926198092Srdivacky 927198092Srdivacky R.resolveKind(); 928198092Srdivacky 929198092Srdivacky return Found; 930193326Sed} 931193326Sed 932193326Sedstatic bool isNamespaceOrTranslationUnitScope(Scope *S) { 933261991Sdim if (DeclContext *Ctx = S->getEntity()) 934193326Sed return Ctx->isFileContext(); 935193326Sed return false; 936193326Sed} 937193326Sed 938205219Srdivacky// Find the next outer declaration context from this scope. This 939205219Srdivacky// routine actually returns the semantic outer context, which may 940205219Srdivacky// differ from the lexical context (encoded directly in the Scope 941205219Srdivacky// stack) when we are parsing a member of a class template. In this 942205219Srdivacky// case, the second element of the pair will be true, to indicate that 943205219Srdivacky// name lookup should continue searching in this semantic context when 944205219Srdivacky// it leaves the current template parameter scope. 945205219Srdivackystatic std::pair<DeclContext *, bool> findOuterContext(Scope *S) { 946261991Sdim DeclContext *DC = S->getEntity(); 947276479Sdim DeclContext *Lexical = nullptr; 948218893Sdim for (Scope *OuterS = S->getParent(); OuterS; 949205219Srdivacky OuterS = OuterS->getParent()) { 950205219Srdivacky if (OuterS->getEntity()) { 951261991Sdim Lexical = OuterS->getEntity(); 952205219Srdivacky break; 953205219Srdivacky } 954205219Srdivacky } 955205219Srdivacky 956205219Srdivacky // C++ [temp.local]p8: 957205219Srdivacky // In the definition of a member of a class template that appears 958205219Srdivacky // outside of the namespace containing the class template 959205219Srdivacky // definition, the name of a template-parameter hides the name of 960205219Srdivacky // a member of this namespace. 961205219Srdivacky // 962205219Srdivacky // Example: 963205219Srdivacky // 964218893Sdim // namespace N { 965218893Sdim // class C { }; 966205219Srdivacky // 967205219Srdivacky // template<class T> class B { 968205219Srdivacky // void f(T); 969218893Sdim // }; 970205219Srdivacky // } 971205219Srdivacky // 972205219Srdivacky // template<class C> void N::B<C>::f(C) { 973205219Srdivacky // C b; // C is the template parameter, not N::C 974205219Srdivacky // } 975205219Srdivacky // 976205219Srdivacky // In this example, the lexical context we return is the 977205219Srdivacky // TranslationUnit, while the semantic context is the namespace N. 978218893Sdim if (!Lexical || !DC || !S->getParent() || 979205219Srdivacky !S->getParent()->isTemplateParamScope()) 980205219Srdivacky return std::make_pair(Lexical, false); 981205219Srdivacky 982218893Sdim // Find the outermost template parameter scope. 983205219Srdivacky // For the example, this is the scope for the template parameters of 984205219Srdivacky // template<class C>. 985205219Srdivacky Scope *OutermostTemplateScope = S->getParent(); 986205219Srdivacky while (OutermostTemplateScope->getParent() && 987205219Srdivacky OutermostTemplateScope->getParent()->isTemplateParamScope()) 988205219Srdivacky OutermostTemplateScope = OutermostTemplateScope->getParent(); 989218893Sdim 990205219Srdivacky // Find the namespace context in which the original scope occurs. In 991205219Srdivacky // the example, this is namespace N. 992205219Srdivacky DeclContext *Semantic = DC; 993205219Srdivacky while (!Semantic->isFileContext()) 994205219Srdivacky Semantic = Semantic->getParent(); 995218893Sdim 996205219Srdivacky // Find the declaration context just outside of the template 997205219Srdivacky // parameter scope. This is the context in which the template is 998205219Srdivacky // being lexically declaration (a namespace context). In the 999205219Srdivacky // example, this is the global scope. 1000205219Srdivacky if (Lexical->isFileContext() && !Lexical->Equals(Semantic) && 1001205219Srdivacky Lexical->Encloses(Semantic)) 1002205219Srdivacky return std::make_pair(Semantic, true); 1003205219Srdivacky 1004205219Srdivacky return std::make_pair(Lexical, false); 1005198092Srdivacky} 1006198092Srdivacky 1007261991Sdimnamespace { 1008261991Sdim/// An RAII object to specify that we want to find block scope extern 1009261991Sdim/// declarations. 1010261991Sdimstruct FindLocalExternScope { 1011261991Sdim FindLocalExternScope(LookupResult &R) 1012261991Sdim : R(R), OldFindLocalExtern(R.getIdentifierNamespace() & 1013261991Sdim Decl::IDNS_LocalExtern) { 1014261991Sdim R.setFindLocalExtern(R.getIdentifierNamespace() & Decl::IDNS_Ordinary); 1015261991Sdim } 1016261991Sdim void restore() { 1017261991Sdim R.setFindLocalExtern(OldFindLocalExtern); 1018261991Sdim } 1019261991Sdim ~FindLocalExternScope() { 1020261991Sdim restore(); 1021261991Sdim } 1022261991Sdim LookupResult &R; 1023261991Sdim bool OldFindLocalExtern; 1024261991Sdim}; 1025296417Sdim} // end anonymous namespace 1026261991Sdim 1027199482Srdivackybool Sema::CppLookupName(LookupResult &R, Scope *S) { 1028234353Sdim assert(getLangOpts().CPlusPlus && "Can perform only C++ lookup"); 1029198092Srdivacky 1030199482Srdivacky DeclarationName Name = R.getLookupName(); 1031261991Sdim Sema::LookupNameKind NameKind = R.getLookupKind(); 1032199482Srdivacky 1033210299Sed // If this is the name of an implicitly-declared special member function, 1034210299Sed // go through the scope stack to implicitly declare 1035210299Sed if (isImplicitlyDeclaredMemberFunctionName(Name)) { 1036210299Sed for (Scope *PreS = S; PreS; PreS = PreS->getParent()) 1037261991Sdim if (DeclContext *DC = PreS->getEntity()) 1038210299Sed DeclareImplicitMemberFunctionsWithName(*this, Name, DC); 1039210299Sed } 1040218893Sdim 1041210299Sed // Implicitly declare member functions with the name we're looking for, if in 1042210299Sed // fact we are in a scope where it matters. 1043210299Sed 1044193326Sed Scope *Initial = S; 1045198092Srdivacky IdentifierResolver::iterator 1046193326Sed I = IdResolver.begin(Name), 1047193326Sed IEnd = IdResolver.end(); 1048193326Sed 1049193326Sed // First we lookup local scope. 1050193326Sed // We don't consider using-directives, as per 7.3.4.p1 [namespace.udir] 1051193326Sed // ...During unqualified name lookup (3.4.1), the names appear as if 1052193326Sed // they were declared in the nearest enclosing namespace which contains 1053193326Sed // both the using-directive and the nominated namespace. 1054198092Srdivacky // [Note: in this context, "contains" means "contains directly or 1055198092Srdivacky // indirectly". 1056193326Sed // 1057193326Sed // For example: 1058193326Sed // namespace A { int i; } 1059193326Sed // void foo() { 1060193326Sed // int i; 1061193326Sed // { 1062193326Sed // using namespace A; 1063193326Sed // ++i; // finds local 'i', A::i appears at global scope 1064193326Sed // } 1065193326Sed // } 1066193326Sed // 1067251662Sdim UnqualUsingDirectiveSet UDirs; 1068251662Sdim bool VisitedUsingDirectives = false; 1069261991Sdim bool LeftStartingScope = false; 1070276479Sdim DeclContext *OutsideOfTemplateParamDC = nullptr; 1071261991Sdim 1072261991Sdim // When performing a scope lookup, we want to find local extern decls. 1073261991Sdim FindLocalExternScope FindLocals(R); 1074261991Sdim 1075193326Sed for (; S && !isNamespaceOrTranslationUnitScope(S); S = S->getParent()) { 1076261991Sdim DeclContext *Ctx = S->getEntity(); 1077208600Srdivacky 1078193326Sed // Check whether the IdResolver has anything in this scope. 1079198092Srdivacky bool Found = false; 1080212904Sdim for (; I != IEnd && S->isDeclScope(*I); ++I) { 1081234353Sdim if (NamedDecl *ND = R.getAcceptableDecl(*I)) { 1082261991Sdim if (NameKind == LookupRedeclarationWithLinkage) { 1083261991Sdim // Determine whether this (or a previous) declaration is 1084261991Sdim // out-of-scope. 1085261991Sdim if (!LeftStartingScope && !Initial->isDeclScope(*I)) 1086261991Sdim LeftStartingScope = true; 1087261991Sdim 1088261991Sdim // If we found something outside of our starting scope that 1089261991Sdim // does not have linkage, skip it. If it's a template parameter, 1090261991Sdim // we still find it, so we can diagnose the invalid redeclaration. 1091261991Sdim if (LeftStartingScope && !((*I)->hasLinkage()) && 1092261991Sdim !(*I)->isTemplateParameter()) { 1093261991Sdim R.setShadowed(); 1094261991Sdim continue; 1095261991Sdim } 1096261991Sdim } 1097261991Sdim 1098198092Srdivacky Found = true; 1099234353Sdim R.addDecl(ND); 1100193326Sed } 1101193326Sed } 1102198092Srdivacky if (Found) { 1103198092Srdivacky R.resolveKind(); 1104208600Srdivacky if (S->isClassScope()) 1105208600Srdivacky if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(Ctx)) 1106208600Srdivacky R.setNamingClass(Record); 1107198092Srdivacky return true; 1108198092Srdivacky } 1109198092Srdivacky 1110261991Sdim if (NameKind == LookupLocalFriendName && !S->isClassScope()) { 1111261991Sdim // C++11 [class.friend]p11: 1112261991Sdim // If a friend declaration appears in a local class and the name 1113261991Sdim // specified is an unqualified name, a prior declaration is 1114261991Sdim // looked up without considering scopes that are outside the 1115261991Sdim // innermost enclosing non-class scope. 1116261991Sdim return false; 1117261991Sdim } 1118261991Sdim 1119205219Srdivacky if (!Ctx && S->isTemplateParamScope() && OutsideOfTemplateParamDC && 1120205219Srdivacky S->getParent() && !S->getParent()->isTemplateParamScope()) { 1121205219Srdivacky // We've just searched the last template parameter scope and 1122239462Sdim // found nothing, so look into the contexts between the 1123205219Srdivacky // lexical and semantic declaration contexts returned by 1124205219Srdivacky // findOuterContext(). This implements the name lookup behavior 1125205219Srdivacky // of C++ [temp.local]p8. 1126205219Srdivacky Ctx = OutsideOfTemplateParamDC; 1127276479Sdim OutsideOfTemplateParamDC = nullptr; 1128205219Srdivacky } 1129205219Srdivacky 1130205219Srdivacky if (Ctx) { 1131205219Srdivacky DeclContext *OuterCtx; 1132205219Srdivacky bool SearchAfterTemplateScope; 1133276479Sdim std::tie(OuterCtx, SearchAfterTemplateScope) = findOuterContext(S); 1134205219Srdivacky if (SearchAfterTemplateScope) 1135205219Srdivacky OutsideOfTemplateParamDC = OuterCtx; 1136205219Srdivacky 1137205219Srdivacky for (; Ctx && !Ctx->Equals(OuterCtx); Ctx = Ctx->getLookupParent()) { 1138204643Srdivacky // We do not directly look into transparent contexts, since 1139204643Srdivacky // those entities will be found in the nearest enclosing 1140204643Srdivacky // non-transparent context. 1141204643Srdivacky if (Ctx->isTransparentContext()) 1142198092Srdivacky continue; 1143204643Srdivacky 1144204643Srdivacky // We do not look directly into function or method contexts, 1145204643Srdivacky // since all of the local variables and parameters of the 1146204643Srdivacky // function/method are present within the Scope. 1147204643Srdivacky if (Ctx->isFunctionOrMethod()) { 1148204643Srdivacky // If we have an Objective-C instance method, look for ivars 1149204643Srdivacky // in the corresponding interface. 1150204643Srdivacky if (ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(Ctx)) { 1151204643Srdivacky if (Method->isInstanceMethod() && Name.getAsIdentifierInfo()) 1152204643Srdivacky if (ObjCInterfaceDecl *Class = Method->getClassInterface()) { 1153204643Srdivacky ObjCInterfaceDecl *ClassDeclared; 1154204643Srdivacky if (ObjCIvarDecl *Ivar = Class->lookupInstanceVariable( 1155218893Sdim Name.getAsIdentifierInfo(), 1156204643Srdivacky ClassDeclared)) { 1157234353Sdim if (NamedDecl *ND = R.getAcceptableDecl(Ivar)) { 1158234353Sdim R.addDecl(ND); 1159204643Srdivacky R.resolveKind(); 1160204643Srdivacky return true; 1161204643Srdivacky } 1162204643Srdivacky } 1163204643Srdivacky } 1164204643Srdivacky } 1165204643Srdivacky 1166204643Srdivacky continue; 1167204643Srdivacky } 1168204643Srdivacky 1169249423Sdim // If this is a file context, we need to perform unqualified name 1170249423Sdim // lookup considering using directives. 1171249423Sdim if (Ctx->isFileContext()) { 1172251662Sdim // If we haven't handled using directives yet, do so now. 1173251662Sdim if (!VisitedUsingDirectives) { 1174251662Sdim // Add using directives from this context up to the top level. 1175251662Sdim for (DeclContext *UCtx = Ctx; UCtx; UCtx = UCtx->getParent()) { 1176251662Sdim if (UCtx->isTransparentContext()) 1177251662Sdim continue; 1178249423Sdim 1179251662Sdim UDirs.visit(UCtx, UCtx); 1180251662Sdim } 1181251662Sdim 1182251662Sdim // Find the innermost file scope, so we can add using directives 1183251662Sdim // from local scopes. 1184251662Sdim Scope *InnermostFileScope = S; 1185251662Sdim while (InnermostFileScope && 1186251662Sdim !isNamespaceOrTranslationUnitScope(InnermostFileScope)) 1187251662Sdim InnermostFileScope = InnermostFileScope->getParent(); 1188251662Sdim UDirs.visitScopeChain(Initial, InnermostFileScope); 1189251662Sdim 1190251662Sdim UDirs.done(); 1191251662Sdim 1192251662Sdim VisitedUsingDirectives = true; 1193251662Sdim } 1194251662Sdim 1195249423Sdim if (CppNamespaceLookup(*this, R, Context, Ctx, UDirs)) { 1196249423Sdim R.resolveKind(); 1197249423Sdim return true; 1198249423Sdim } 1199249423Sdim 1200249423Sdim continue; 1201249423Sdim } 1202249423Sdim 1203198092Srdivacky // Perform qualified name lookup into this context. 1204198092Srdivacky // FIXME: In some cases, we know that every name that could be found by 1205198092Srdivacky // this qualified name lookup will also be on the identifier chain. For 1206198092Srdivacky // example, inside a class without any base classes, we never need to 1207198092Srdivacky // perform qualified lookup because all of the members are on top of the 1208198092Srdivacky // identifier chain. 1209202379Srdivacky if (LookupQualifiedName(R, Ctx, /*InUnqualifiedLookup=*/true)) 1210198092Srdivacky return true; 1211193326Sed } 1212193326Sed } 1213193326Sed } 1214193326Sed 1215199482Srdivacky // Stop if we ran out of scopes. 1216199482Srdivacky // FIXME: This really, really shouldn't be happening. 1217199482Srdivacky if (!S) return false; 1218199482Srdivacky 1219218893Sdim // If we are looking for members, no need to look into global/namespace scope. 1220261991Sdim if (NameKind == LookupMemberName) 1221218893Sdim return false; 1222218893Sdim 1223193326Sed // Collect UsingDirectiveDecls in all scopes, and recursively all 1224193326Sed // nominated namespaces by those using-directives. 1225199482Srdivacky // 1226193326Sed // FIXME: Cache this sorted list in Scope structure, and DeclContext, so we 1227193326Sed // don't build it for each lookup! 1228251662Sdim if (!VisitedUsingDirectives) { 1229251662Sdim UDirs.visitScopeChain(Initial, S); 1230251662Sdim UDirs.done(); 1231251662Sdim } 1232261991Sdim 1233261991Sdim // If we're not performing redeclaration lookup, do not look for local 1234261991Sdim // extern declarations outside of a function scope. 1235261991Sdim if (!R.isForRedeclaration()) 1236261991Sdim FindLocals.restore(); 1237261991Sdim 1238193326Sed // Lookup namespace scope, and global scope. 1239193326Sed // Unqualified name lookup in C++ requires looking into scopes 1240193326Sed // that aren't strictly lexical, and therefore we walk through the 1241193326Sed // context as well as walking through the scopes. 1242193326Sed for (; S; S = S->getParent()) { 1243193326Sed // Check whether the IdResolver has anything in this scope. 1244198092Srdivacky bool Found = false; 1245212904Sdim for (; I != IEnd && S->isDeclScope(*I); ++I) { 1246234353Sdim if (NamedDecl *ND = R.getAcceptableDecl(*I)) { 1247193326Sed // We found something. Look for anything else in our scope 1248193326Sed // with this same name and in an acceptable identifier 1249193326Sed // namespace, so that we can construct an overload set if we 1250193326Sed // need to. 1251198092Srdivacky Found = true; 1252234353Sdim R.addDecl(ND); 1253193326Sed } 1254193326Sed } 1255193326Sed 1256208600Srdivacky if (Found && S->isTemplateParamScope()) { 1257208600Srdivacky R.resolveKind(); 1258208600Srdivacky return true; 1259208600Srdivacky } 1260193326Sed 1261261991Sdim DeclContext *Ctx = S->getEntity(); 1262208600Srdivacky if (!Ctx && S->isTemplateParamScope() && OutsideOfTemplateParamDC && 1263208600Srdivacky S->getParent() && !S->getParent()->isTemplateParamScope()) { 1264208600Srdivacky // We've just searched the last template parameter scope and 1265239462Sdim // found nothing, so look into the contexts between the 1266208600Srdivacky // lexical and semantic declaration contexts returned by 1267208600Srdivacky // findOuterContext(). This implements the name lookup behavior 1268208600Srdivacky // of C++ [temp.local]p8. 1269208600Srdivacky Ctx = OutsideOfTemplateParamDC; 1270276479Sdim OutsideOfTemplateParamDC = nullptr; 1271203955Srdivacky } 1272218893Sdim 1273208600Srdivacky if (Ctx) { 1274208600Srdivacky DeclContext *OuterCtx; 1275208600Srdivacky bool SearchAfterTemplateScope; 1276276479Sdim std::tie(OuterCtx, SearchAfterTemplateScope) = findOuterContext(S); 1277208600Srdivacky if (SearchAfterTemplateScope) 1278208600Srdivacky OutsideOfTemplateParamDC = OuterCtx; 1279203955Srdivacky 1280208600Srdivacky for (; Ctx && !Ctx->Equals(OuterCtx); Ctx = Ctx->getLookupParent()) { 1281208600Srdivacky // We do not directly look into transparent contexts, since 1282208600Srdivacky // those entities will be found in the nearest enclosing 1283208600Srdivacky // non-transparent context. 1284208600Srdivacky if (Ctx->isTransparentContext()) 1285208600Srdivacky continue; 1286218893Sdim 1287208600Srdivacky // If we have a context, and it's not a context stashed in the 1288208600Srdivacky // template parameter scope for an out-of-line definition, also 1289208600Srdivacky // look into that context. 1290208600Srdivacky if (!(Found && S && S->isTemplateParamScope())) { 1291208600Srdivacky assert(Ctx->isFileContext() && 1292208600Srdivacky "We should have been looking only at file context here already."); 1293218893Sdim 1294208600Srdivacky // Look into context considering using-directives. 1295208600Srdivacky if (CppNamespaceLookup(*this, R, Context, Ctx, UDirs)) 1296208600Srdivacky Found = true; 1297208600Srdivacky } 1298218893Sdim 1299208600Srdivacky if (Found) { 1300208600Srdivacky R.resolveKind(); 1301208600Srdivacky return true; 1302208600Srdivacky } 1303218893Sdim 1304208600Srdivacky if (R.isForRedeclaration() && !Ctx->isTransparentContext()) 1305208600Srdivacky return false; 1306208600Srdivacky } 1307198092Srdivacky } 1308198092Srdivacky 1309203955Srdivacky if (R.isForRedeclaration() && Ctx && !Ctx->isTransparentContext()) 1310198092Srdivacky return false; 1311193326Sed } 1312193326Sed 1313198092Srdivacky return !R.empty(); 1314193326Sed} 1315193326Sed 1316261991Sdim/// \brief Find the declaration that a class temploid member specialization was 1317261991Sdim/// instantiated from, or the member itself if it is an explicit specialization. 1318261991Sdimstatic Decl *getInstantiatedFrom(Decl *D, MemberSpecializationInfo *MSInfo) { 1319261991Sdim return MSInfo->isExplicitSpecialization() ? D : MSInfo->getInstantiatedFrom(); 1320261991Sdim} 1321261991Sdim 1322288943SdimModule *Sema::getOwningModule(Decl *Entity) { 1323288943Sdim // If it's imported, grab its owning module. 1324288943Sdim Module *M = Entity->getImportedOwningModule(); 1325288943Sdim if (M || !isa<NamedDecl>(Entity) || !cast<NamedDecl>(Entity)->isHidden()) 1326288943Sdim return M; 1327288943Sdim assert(!Entity->isFromASTFile() && 1328288943Sdim "hidden entity from AST file has no owning module"); 1329288943Sdim 1330288943Sdim if (!getLangOpts().ModulesLocalVisibility) { 1331288943Sdim // If we're not tracking visibility locally, the only way a declaration 1332288943Sdim // can be hidden and local is if it's hidden because it's parent is (for 1333288943Sdim // instance, maybe this is a lazily-declared special member of an imported 1334288943Sdim // class). 1335288943Sdim auto *Parent = cast<NamedDecl>(Entity->getDeclContext()); 1336288943Sdim assert(Parent->isHidden() && "unexpectedly hidden decl"); 1337288943Sdim return getOwningModule(Parent); 1338288943Sdim } 1339288943Sdim 1340288943Sdim // It's local and hidden; grab or compute its owning module. 1341288943Sdim M = Entity->getLocalOwningModule(); 1342288943Sdim if (M) 1343288943Sdim return M; 1344288943Sdim 1345288943Sdim if (auto *Containing = 1346288943Sdim PP.getModuleContainingLocation(Entity->getLocation())) { 1347288943Sdim M = Containing; 1348288943Sdim } else if (Entity->isInvalidDecl() || Entity->getLocation().isInvalid()) { 1349288943Sdim // Don't bother tracking visibility for invalid declarations with broken 1350288943Sdim // locations. 1351288943Sdim cast<NamedDecl>(Entity)->setHidden(false); 1352288943Sdim } else { 1353288943Sdim // We need to assign a module to an entity that exists outside of any 1354288943Sdim // module, so that we can hide it from modules that we textually enter. 1355288943Sdim // Invent a fake module for all such entities. 1356288943Sdim if (!CachedFakeTopLevelModule) { 1357288943Sdim CachedFakeTopLevelModule = 1358288943Sdim PP.getHeaderSearchInfo().getModuleMap().findOrCreateModule( 1359288943Sdim "<top-level>", nullptr, false, false).first; 1360288943Sdim 1361288943Sdim auto &SrcMgr = PP.getSourceManager(); 1362288943Sdim SourceLocation StartLoc = 1363288943Sdim SrcMgr.getLocForStartOfFile(SrcMgr.getMainFileID()); 1364288943Sdim auto &TopLevel = 1365288943Sdim VisibleModulesStack.empty() ? VisibleModules : VisibleModulesStack[0]; 1366288943Sdim TopLevel.setVisible(CachedFakeTopLevelModule, StartLoc); 1367288943Sdim } 1368288943Sdim 1369288943Sdim M = CachedFakeTopLevelModule; 1370288943Sdim } 1371288943Sdim 1372288943Sdim if (M) 1373288943Sdim Entity->setLocalOwningModule(M); 1374288943Sdim return M; 1375288943Sdim} 1376288943Sdim 1377288943Sdimvoid Sema::makeMergedDefinitionVisible(NamedDecl *ND, SourceLocation Loc) { 1378288943Sdim if (auto *M = PP.getModuleContainingLocation(Loc)) 1379288943Sdim Context.mergeDefinitionIntoModule(ND, M); 1380288943Sdim else 1381288943Sdim // We're not building a module; just make the definition visible. 1382288943Sdim ND->setHidden(false); 1383288943Sdim 1384288943Sdim // If ND is a template declaration, make the template parameters 1385288943Sdim // visible too. They're not (necessarily) within a mergeable DeclContext. 1386288943Sdim if (auto *TD = dyn_cast<TemplateDecl>(ND)) 1387288943Sdim for (auto *Param : *TD->getTemplateParameters()) 1388288943Sdim makeMergedDefinitionVisible(Param, Loc); 1389288943Sdim} 1390288943Sdim 1391261991Sdim/// \brief Find the module in which the given declaration was defined. 1392288943Sdimstatic Module *getDefiningModule(Sema &S, Decl *Entity) { 1393261991Sdim if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Entity)) { 1394261991Sdim // If this function was instantiated from a template, the defining module is 1395261991Sdim // the module containing the pattern. 1396261991Sdim if (FunctionDecl *Pattern = FD->getTemplateInstantiationPattern()) 1397261991Sdim Entity = Pattern; 1398261991Sdim } else if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Entity)) { 1399280031Sdim if (CXXRecordDecl *Pattern = RD->getTemplateInstantiationPattern()) 1400280031Sdim Entity = Pattern; 1401261991Sdim } else if (EnumDecl *ED = dyn_cast<EnumDecl>(Entity)) { 1402261991Sdim if (MemberSpecializationInfo *MSInfo = ED->getMemberSpecializationInfo()) 1403261991Sdim Entity = getInstantiatedFrom(ED, MSInfo); 1404261991Sdim } else if (VarDecl *VD = dyn_cast<VarDecl>(Entity)) { 1405261991Sdim // FIXME: Map from variable template specializations back to the template. 1406261991Sdim if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) 1407261991Sdim Entity = getInstantiatedFrom(VD, MSInfo); 1408261991Sdim } 1409261991Sdim 1410261991Sdim // Walk up to the containing context. That might also have been instantiated 1411261991Sdim // from a template. 1412261991Sdim DeclContext *Context = Entity->getDeclContext(); 1413261991Sdim if (Context->isFileContext()) 1414288943Sdim return S.getOwningModule(Entity); 1415288943Sdim return getDefiningModule(S, cast<Decl>(Context)); 1416261991Sdim} 1417261991Sdim 1418261991Sdimllvm::DenseSet<Module*> &Sema::getLookupModules() { 1419261991Sdim unsigned N = ActiveTemplateInstantiations.size(); 1420261991Sdim for (unsigned I = ActiveTemplateInstantiationLookupModules.size(); 1421261991Sdim I != N; ++I) { 1422288943Sdim Module *M = 1423288943Sdim getDefiningModule(*this, ActiveTemplateInstantiations[I].Entity); 1424261991Sdim if (M && !LookupModulesCache.insert(M).second) 1425276479Sdim M = nullptr; 1426261991Sdim ActiveTemplateInstantiationLookupModules.push_back(M); 1427261991Sdim } 1428261991Sdim return LookupModulesCache; 1429261991Sdim} 1430261991Sdim 1431288943Sdimbool Sema::hasVisibleMergedDefinition(NamedDecl *Def) { 1432288943Sdim for (Module *Merged : Context.getModulesWithMergedDefinition(Def)) 1433288943Sdim if (isModuleVisible(Merged)) 1434288943Sdim return true; 1435288943Sdim return false; 1436288943Sdim} 1437288943Sdim 1438288943Sdimtemplate<typename ParmDecl> 1439288943Sdimstatic bool 1440288943SdimhasVisibleDefaultArgument(Sema &S, const ParmDecl *D, 1441288943Sdim llvm::SmallVectorImpl<Module *> *Modules) { 1442288943Sdim if (!D->hasDefaultArgument()) 1443288943Sdim return false; 1444288943Sdim 1445288943Sdim while (D) { 1446288943Sdim auto &DefaultArg = D->getDefaultArgStorage(); 1447288943Sdim if (!DefaultArg.isInherited() && S.isVisible(D)) 1448288943Sdim return true; 1449288943Sdim 1450288943Sdim if (!DefaultArg.isInherited() && Modules) { 1451288943Sdim auto *NonConstD = const_cast<ParmDecl*>(D); 1452288943Sdim Modules->push_back(S.getOwningModule(NonConstD)); 1453288943Sdim const auto &Merged = S.Context.getModulesWithMergedDefinition(NonConstD); 1454288943Sdim Modules->insert(Modules->end(), Merged.begin(), Merged.end()); 1455288943Sdim } 1456288943Sdim 1457288943Sdim // If there was a previous default argument, maybe its parameter is visible. 1458288943Sdim D = DefaultArg.getInheritedFrom(); 1459288943Sdim } 1460288943Sdim return false; 1461288943Sdim} 1462288943Sdim 1463288943Sdimbool Sema::hasVisibleDefaultArgument(const NamedDecl *D, 1464288943Sdim llvm::SmallVectorImpl<Module *> *Modules) { 1465288943Sdim if (auto *P = dyn_cast<TemplateTypeParmDecl>(D)) 1466288943Sdim return ::hasVisibleDefaultArgument(*this, P, Modules); 1467288943Sdim if (auto *P = dyn_cast<NonTypeTemplateParmDecl>(D)) 1468288943Sdim return ::hasVisibleDefaultArgument(*this, P, Modules); 1469288943Sdim return ::hasVisibleDefaultArgument(*this, cast<TemplateTemplateParmDecl>(D), 1470288943Sdim Modules); 1471288943Sdim} 1472288943Sdim 1473261991Sdim/// \brief Determine whether a declaration is visible to name lookup. 1474261991Sdim/// 1475261991Sdim/// This routine determines whether the declaration D is visible in the current 1476261991Sdim/// lookup context, taking into account the current template instantiation 1477261991Sdim/// stack. During template instantiation, a declaration is visible if it is 1478261991Sdim/// visible from a module containing any entity on the template instantiation 1479261991Sdim/// path (by instantiating a template, you allow it to see the declarations that 1480261991Sdim/// your module can see, including those later on in your module). 1481261991Sdimbool LookupResult::isVisibleSlow(Sema &SemaRef, NamedDecl *D) { 1482288943Sdim assert(D->isHidden() && "should not call this: not in slow case"); 1483296417Sdim Module *DeclModule = nullptr; 1484296417Sdim 1485296417Sdim if (SemaRef.getLangOpts().ModulesLocalVisibility) { 1486296417Sdim DeclModule = SemaRef.getOwningModule(D); 1487296417Sdim if (!DeclModule) { 1488296417Sdim // getOwningModule() may have decided the declaration should not be hidden. 1489296417Sdim assert(!D->isHidden() && "hidden decl not from a module"); 1490296417Sdim return true; 1491296417Sdim } 1492261991Sdim 1493296417Sdim // If the owning module is visible, and the decl is not module private, 1494296417Sdim // then the decl is visible too. (Module private is ignored within the same 1495296417Sdim // top-level module.) 1496296417Sdim if ((!D->isFromASTFile() || !D->isModulePrivate()) && 1497296417Sdim (SemaRef.isModuleVisible(DeclModule) || 1498296417Sdim SemaRef.hasVisibleMergedDefinition(D))) 1499288943Sdim return true; 1500288943Sdim } 1501288943Sdim 1502288943Sdim // If this declaration is not at namespace scope nor module-private, 1503288943Sdim // then it is visible if its lexical parent has a visible definition. 1504288943Sdim DeclContext *DC = D->getLexicalDeclContext(); 1505288943Sdim if (!D->isModulePrivate() && 1506288943Sdim DC && !DC->isFileContext() && !isa<LinkageSpecDecl>(DC)) { 1507288943Sdim // For a parameter, check whether our current template declaration's 1508288943Sdim // lexical context is visible, not whether there's some other visible 1509288943Sdim // definition of it, because parameters aren't "within" the definition. 1510288943Sdim if ((D->isTemplateParameter() || isa<ParmVarDecl>(D)) 1511288943Sdim ? isVisible(SemaRef, cast<NamedDecl>(DC)) 1512288943Sdim : SemaRef.hasVisibleDefinition(cast<NamedDecl>(DC))) { 1513288943Sdim if (SemaRef.ActiveTemplateInstantiations.empty() && 1514288943Sdim // FIXME: Do something better in this case. 1515288943Sdim !SemaRef.getLangOpts().ModulesLocalVisibility) { 1516288943Sdim // Cache the fact that this declaration is implicitly visible because 1517288943Sdim // its parent has a visible definition. 1518288943Sdim D->setHidden(false); 1519288943Sdim } 1520288943Sdim return true; 1521288943Sdim } 1522288943Sdim return false; 1523288943Sdim } 1524288943Sdim 1525261991Sdim // Find the extra places where we need to look. 1526261991Sdim llvm::DenseSet<Module*> &LookupModules = SemaRef.getLookupModules(); 1527261991Sdim if (LookupModules.empty()) 1528261991Sdim return false; 1529261991Sdim 1530296417Sdim if (!DeclModule) { 1531296417Sdim DeclModule = SemaRef.getOwningModule(D); 1532296417Sdim assert(DeclModule && "hidden decl not from a module"); 1533296417Sdim } 1534296417Sdim 1535261991Sdim // If our lookup set contains the decl's module, it's visible. 1536261991Sdim if (LookupModules.count(DeclModule)) 1537261991Sdim return true; 1538261991Sdim 1539261991Sdim // If the declaration isn't exported, it's not visible in any other module. 1540261991Sdim if (D->isModulePrivate()) 1541261991Sdim return false; 1542261991Sdim 1543261991Sdim // Check whether DeclModule is transitively exported to an import of 1544261991Sdim // the lookup set. 1545296417Sdim return std::any_of(LookupModules.begin(), LookupModules.end(), 1546296417Sdim [&](Module *M) { return M->isModuleVisible(DeclModule); }); 1547261991Sdim} 1548261991Sdim 1549288943Sdimbool Sema::isVisibleSlow(const NamedDecl *D) { 1550288943Sdim return LookupResult::isVisible(*this, const_cast<NamedDecl*>(D)); 1551288943Sdim} 1552288943Sdim 1553296417Sdimbool Sema::shouldLinkPossiblyHiddenDecl(LookupResult &R, const NamedDecl *New) { 1554296417Sdim for (auto *D : R) { 1555296417Sdim if (isVisible(D)) 1556296417Sdim return true; 1557296417Sdim } 1558296417Sdim return New->isExternallyVisible(); 1559296417Sdim} 1560296417Sdim 1561234353Sdim/// \brief Retrieve the visible declaration corresponding to D, if any. 1562234353Sdim/// 1563234353Sdim/// This routine determines whether the declaration D is visible in the current 1564234353Sdim/// module, with the current imports. If not, it checks whether any 1565234353Sdim/// redeclaration of D is visible, and if so, returns that declaration. 1566261991Sdim/// 1567234353Sdim/// \returns D, or a visible previous declaration of D, whichever is more recent 1568234353Sdim/// and visible. If no declaration of D is visible, returns null. 1569261991Sdimstatic NamedDecl *findAcceptableDecl(Sema &SemaRef, NamedDecl *D) { 1570261991Sdim assert(!LookupResult::isVisible(SemaRef, D) && "not in slow case"); 1571261991Sdim 1572276479Sdim for (auto RD : D->redecls()) { 1573276479Sdim if (auto ND = dyn_cast<NamedDecl>(RD)) { 1574288943Sdim // FIXME: This is wrong in the case where the previous declaration is not 1575288943Sdim // visible in the same scope as D. This needs to be done much more 1576288943Sdim // carefully. 1577261991Sdim if (LookupResult::isVisible(SemaRef, ND)) 1578234353Sdim return ND; 1579234353Sdim } 1580234353Sdim } 1581261991Sdim 1582276479Sdim return nullptr; 1583234353Sdim} 1584234353Sdim 1585261991SdimNamedDecl *LookupResult::getAcceptableDeclSlow(NamedDecl *D) const { 1586280031Sdim return findAcceptableDecl(getSema(), D); 1587261991Sdim} 1588261991Sdim 1589193326Sed/// @brief Perform unqualified name lookup starting from a given 1590193326Sed/// scope. 1591193326Sed/// 1592193326Sed/// Unqualified name lookup (C++ [basic.lookup.unqual], C99 6.2.1) is 1593193326Sed/// used to find names within the current scope. For example, 'x' in 1594193326Sed/// @code 1595193326Sed/// int x; 1596193326Sed/// int f() { 1597193326Sed/// return x; // unqualified name look finds 'x' in the global scope 1598193326Sed/// } 1599193326Sed/// @endcode 1600193326Sed/// 1601193326Sed/// Different lookup criteria can find different names. For example, a 1602193326Sed/// particular scope can have both a struct and a function of the same 1603193326Sed/// name, and each can be found by certain lookup criteria. For more 1604193326Sed/// information about lookup criteria, see the documentation for the 1605193326Sed/// class LookupCriteria. 1606193326Sed/// 1607193326Sed/// @param S The scope from which unqualified name lookup will 1608193326Sed/// begin. If the lookup criteria permits, name lookup may also search 1609193326Sed/// in the parent scopes. 1610193326Sed/// 1611239462Sdim/// @param [in,out] R Specifies the lookup to perform (e.g., the name to 1612239462Sdim/// look up and the lookup kind), and is updated with the results of lookup 1613239462Sdim/// including zero or more declarations and possibly additional information 1614239462Sdim/// used to diagnose ambiguities. 1615193326Sed/// 1616239462Sdim/// @returns \c true if lookup succeeded and false otherwise. 1617199482Srdivackybool Sema::LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation) { 1618199482Srdivacky DeclarationName Name = R.getLookupName(); 1619198092Srdivacky if (!Name) return false; 1620193326Sed 1621199482Srdivacky LookupNameKind NameKind = R.getLookupKind(); 1622199482Srdivacky 1623234353Sdim if (!getLangOpts().CPlusPlus) { 1624193326Sed // Unqualified name lookup in C/Objective-C is purely lexical, so 1625193326Sed // search in the declarations attached to the name. 1626201361Srdivacky if (NameKind == Sema::LookupRedeclarationWithLinkage) { 1627193326Sed // Find the nearest non-transparent declaration scope. 1628193326Sed while (!(S->getFlags() & Scope::DeclScope) || 1629261991Sdim (S->getEntity() && S->getEntity()->isTransparentContext())) 1630193326Sed S = S->getParent(); 1631201361Srdivacky } 1632193326Sed 1633261991Sdim // When performing a scope lookup, we want to find local extern decls. 1634261991Sdim FindLocalExternScope FindLocals(R); 1635193326Sed 1636193326Sed // Scan up the scope chain looking for a decl that matches this 1637193326Sed // identifier that is in the appropriate namespace. This search 1638193326Sed // should not take long, as shadowing of names is uncommon, and 1639193326Sed // deep shadowing is extremely uncommon. 1640193326Sed bool LeftStartingScope = false; 1641193326Sed 1642193326Sed for (IdentifierResolver::iterator I = IdResolver.begin(Name), 1643198092Srdivacky IEnd = IdResolver.end(); 1644193326Sed I != IEnd; ++I) 1645261991Sdim if (NamedDecl *D = R.getAcceptableDecl(*I)) { 1646193326Sed if (NameKind == LookupRedeclarationWithLinkage) { 1647193326Sed // Determine whether this (or a previous) declaration is 1648193326Sed // out-of-scope. 1649212904Sdim if (!LeftStartingScope && !S->isDeclScope(*I)) 1650193326Sed LeftStartingScope = true; 1651193326Sed 1652193326Sed // If we found something outside of our starting scope that 1653193326Sed // does not have linkage, skip it. 1654261991Sdim if (LeftStartingScope && !((*I)->hasLinkage())) { 1655261991Sdim R.setShadowed(); 1656193326Sed continue; 1657261991Sdim } 1658193326Sed } 1659224145Sdim else if (NameKind == LookupObjCImplicitSelfParam && 1660224145Sdim !isa<ImplicitParamDecl>(*I)) 1661224145Sdim continue; 1662261991Sdim 1663234353Sdim R.addDecl(D); 1664198092Srdivacky 1665234353Sdim // Check whether there are any other declarations with the same name 1666234353Sdim // and in the same scope. 1667234353Sdim if (I != IEnd) { 1668234353Sdim // Find the scope in which this declaration was declared (if it 1669234353Sdim // actually exists in a Scope). 1670234353Sdim while (S && !S->isDeclScope(D)) 1671193326Sed S = S->getParent(); 1672234353Sdim 1673234353Sdim // If the scope containing the declaration is the translation unit, 1674234353Sdim // then we'll need to perform our checks based on the matching 1675234353Sdim // DeclContexts rather than matching scopes. 1676234353Sdim if (S && isNamespaceOrTranslationUnitScope(S)) 1677276479Sdim S = nullptr; 1678193326Sed 1679234353Sdim // Compute the DeclContext, if we need it. 1680276479Sdim DeclContext *DC = nullptr; 1681234353Sdim if (!S) 1682234353Sdim DC = (*I)->getDeclContext()->getRedeclContext(); 1683234353Sdim 1684193326Sed IdentifierResolver::iterator LastI = I; 1685193326Sed for (++LastI; LastI != IEnd; ++LastI) { 1686234353Sdim if (S) { 1687234353Sdim // Match based on scope. 1688234353Sdim if (!S->isDeclScope(*LastI)) 1689234353Sdim break; 1690234353Sdim } else { 1691234353Sdim // Match based on DeclContext. 1692234353Sdim DeclContext *LastDC 1693234353Sdim = (*LastI)->getDeclContext()->getRedeclContext(); 1694234353Sdim if (!LastDC->Equals(DC)) 1695234353Sdim break; 1696234353Sdim } 1697261991Sdim 1698261991Sdim // If the declaration is in the right namespace and visible, add it. 1699261991Sdim if (NamedDecl *LastD = R.getAcceptableDecl(*LastI)) 1700261991Sdim R.addDecl(LastD); 1701193326Sed } 1702234353Sdim 1703234353Sdim R.resolveKind(); 1704193326Sed } 1705261991Sdim 1706198092Srdivacky return true; 1707193326Sed } 1708193326Sed } else { 1709193326Sed // Perform C++ unqualified name lookup. 1710199482Srdivacky if (CppLookupName(R, S)) 1711198092Srdivacky return true; 1712193326Sed } 1713193326Sed 1714193326Sed // If we didn't find a use of this identifier, and if the identifier 1715193326Sed // corresponds to a compiler builtin, create the decl object for the builtin 1716193326Sed // now, injecting it into translation unit scope, and return it. 1717221345Sdim if (AllowBuiltinCreation && LookupBuiltin(*this, R)) 1718221345Sdim return true; 1719193326Sed 1720219077Sdim // If we didn't find a use of this identifier, the ExternalSource 1721219077Sdim // may be able to handle the situation. 1722219077Sdim // Note: some lookup failures are expected! 1723219077Sdim // See e.g. R.isForRedeclaration(). 1724219077Sdim return (ExternalSource && ExternalSource->LookupUnqualified(R, S)); 1725193326Sed} 1726193326Sed 1727198092Srdivacky/// @brief Perform qualified name lookup in the namespaces nominated by 1728198092Srdivacky/// using directives by the given context. 1729198092Srdivacky/// 1730198092Srdivacky/// C++98 [namespace.qual]p2: 1731239462Sdim/// Given X::m (where X is a user-declared namespace), or given \::m 1732198092Srdivacky/// (where X is the global namespace), let S be the set of all 1733198092Srdivacky/// declarations of m in X and in the transitive closure of all 1734198092Srdivacky/// namespaces nominated by using-directives in X and its used 1735198092Srdivacky/// namespaces, except that using-directives are ignored in any 1736198092Srdivacky/// namespace, including X, directly containing one or more 1737198092Srdivacky/// declarations of m. No namespace is searched more than once in 1738198092Srdivacky/// the lookup of a name. If S is the empty set, the program is 1739198092Srdivacky/// ill-formed. Otherwise, if S has exactly one member, or if the 1740198092Srdivacky/// context of the reference is a using-declaration 1741198092Srdivacky/// (namespace.udecl), S is the required set of declarations of 1742198092Srdivacky/// m. Otherwise if the use of m is not one that allows a unique 1743198092Srdivacky/// declaration to be chosen from S, the program is ill-formed. 1744239462Sdim/// 1745198092Srdivacky/// C++98 [namespace.qual]p5: 1746198092Srdivacky/// During the lookup of a qualified namespace member name, if the 1747198092Srdivacky/// lookup finds more than one declaration of the member, and if one 1748198092Srdivacky/// declaration introduces a class name or enumeration name and the 1749198092Srdivacky/// other declarations either introduce the same object, the same 1750198092Srdivacky/// enumerator or a set of functions, the non-type name hides the 1751198092Srdivacky/// class or enumeration name if and only if the declarations are 1752198092Srdivacky/// from the same namespace; otherwise (the declarations are from 1753198092Srdivacky/// different namespaces), the program is ill-formed. 1754203955Srdivackystatic bool LookupQualifiedNameInUsingDirectives(Sema &S, LookupResult &R, 1755199482Srdivacky DeclContext *StartDC) { 1756198092Srdivacky assert(StartDC->isFileContext() && "start context is not a file context"); 1757198092Srdivacky 1758276479Sdim DeclContext::udir_range UsingDirectives = StartDC->using_directives(); 1759276479Sdim if (UsingDirectives.begin() == UsingDirectives.end()) return false; 1760198092Srdivacky 1761198092Srdivacky // We have at least added all these contexts to the queue. 1762234353Sdim llvm::SmallPtrSet<DeclContext*, 8> Visited; 1763198092Srdivacky Visited.insert(StartDC); 1764198092Srdivacky 1765198092Srdivacky // We have not yet looked into these namespaces, much less added 1766198092Srdivacky // their "using-children" to the queue. 1767226633Sdim SmallVector<NamespaceDecl*, 8> Queue; 1768198092Srdivacky 1769198092Srdivacky // We have already looked into the initial namespace; seed the queue 1770198092Srdivacky // with its using-children. 1771276479Sdim for (auto *I : UsingDirectives) { 1772276479Sdim NamespaceDecl *ND = I->getNominatedNamespace()->getOriginalNamespace(); 1773280031Sdim if (Visited.insert(ND).second) 1774198092Srdivacky Queue.push_back(ND); 1775198092Srdivacky } 1776198092Srdivacky 1777198092Srdivacky // The easiest way to implement the restriction in [namespace.qual]p5 1778198092Srdivacky // is to check whether any of the individual results found a tag 1779198092Srdivacky // and, if so, to declare an ambiguity if the final result is not 1780198092Srdivacky // a tag. 1781198092Srdivacky bool FoundTag = false; 1782198092Srdivacky bool FoundNonTag = false; 1783198092Srdivacky 1784199482Srdivacky LookupResult LocalR(LookupResult::Temporary, R); 1785198092Srdivacky 1786198092Srdivacky bool Found = false; 1787198092Srdivacky while (!Queue.empty()) { 1788261991Sdim NamespaceDecl *ND = Queue.pop_back_val(); 1789198092Srdivacky 1790198092Srdivacky // We go through some convolutions here to avoid copying results 1791198092Srdivacky // between LookupResults. 1792198092Srdivacky bool UseLocal = !R.empty(); 1793199482Srdivacky LookupResult &DirectR = UseLocal ? LocalR : R; 1794203955Srdivacky bool FoundDirect = LookupDirect(S, DirectR, ND); 1795198092Srdivacky 1796198092Srdivacky if (FoundDirect) { 1797198092Srdivacky // First do any local hiding. 1798198092Srdivacky DirectR.resolveKind(); 1799198092Srdivacky 1800198092Srdivacky // If the local result is a tag, remember that. 1801198092Srdivacky if (DirectR.isSingleTagDecl()) 1802198092Srdivacky FoundTag = true; 1803198092Srdivacky else 1804198092Srdivacky FoundNonTag = true; 1805198092Srdivacky 1806198092Srdivacky // Append the local results to the total results if necessary. 1807198092Srdivacky if (UseLocal) { 1808198092Srdivacky R.addAllDecls(LocalR); 1809198092Srdivacky LocalR.clear(); 1810198092Srdivacky } 1811198092Srdivacky } 1812198092Srdivacky 1813198092Srdivacky // If we find names in this namespace, ignore its using directives. 1814198092Srdivacky if (FoundDirect) { 1815198092Srdivacky Found = true; 1816198092Srdivacky continue; 1817198092Srdivacky } 1818198092Srdivacky 1819276479Sdim for (auto I : ND->using_directives()) { 1820276479Sdim NamespaceDecl *Nom = I->getNominatedNamespace(); 1821280031Sdim if (Visited.insert(Nom).second) 1822198092Srdivacky Queue.push_back(Nom); 1823198092Srdivacky } 1824198092Srdivacky } 1825198092Srdivacky 1826198092Srdivacky if (Found) { 1827198092Srdivacky if (FoundTag && FoundNonTag) 1828198092Srdivacky R.setAmbiguousQualifiedTagHiding(); 1829198092Srdivacky else 1830198092Srdivacky R.resolveKind(); 1831198092Srdivacky } 1832198092Srdivacky 1833198092Srdivacky return Found; 1834198092Srdivacky} 1835198092Srdivacky 1836212904Sdim/// \brief Callback that looks for any member of a class with the given name. 1837218893Sdimstatic bool LookupAnyMember(const CXXBaseSpecifier *Specifier, 1838296417Sdim CXXBasePath &Path, DeclarationName Name) { 1839212904Sdim RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 1840218893Sdim 1841296417Sdim Path.Decls = BaseRecord->lookup(Name); 1842249423Sdim return !Path.Decls.empty(); 1843212904Sdim} 1844212904Sdim 1845218893Sdim/// \brief Determine whether the given set of member declarations contains only 1846218893Sdim/// static members, nested types, and enumerators. 1847218893Sdimtemplate<typename InputIterator> 1848218893Sdimstatic bool HasOnlyStaticMembers(InputIterator First, InputIterator Last) { 1849218893Sdim Decl *D = (*First)->getUnderlyingDecl(); 1850218893Sdim if (isa<VarDecl>(D) || isa<TypeDecl>(D) || isa<EnumConstantDecl>(D)) 1851218893Sdim return true; 1852218893Sdim 1853218893Sdim if (isa<CXXMethodDecl>(D)) { 1854218893Sdim // Determine whether all of the methods are static. 1855218893Sdim bool AllMethodsAreStatic = true; 1856218893Sdim for(; First != Last; ++First) { 1857218893Sdim D = (*First)->getUnderlyingDecl(); 1858218893Sdim 1859218893Sdim if (!isa<CXXMethodDecl>(D)) { 1860218893Sdim assert(isa<TagDecl>(D) && "Non-function must be a tag decl"); 1861218893Sdim break; 1862218893Sdim } 1863218893Sdim 1864218893Sdim if (!cast<CXXMethodDecl>(D)->isStatic()) { 1865218893Sdim AllMethodsAreStatic = false; 1866218893Sdim break; 1867218893Sdim } 1868218893Sdim } 1869218893Sdim 1870218893Sdim if (AllMethodsAreStatic) 1871218893Sdim return true; 1872218893Sdim } 1873218893Sdim 1874218893Sdim return false; 1875218893Sdim} 1876218893Sdim 1877202379Srdivacky/// \brief Perform qualified name lookup into a given context. 1878193326Sed/// 1879193326Sed/// Qualified name lookup (C++ [basic.lookup.qual]) is used to find 1880193326Sed/// names when the context of those names is explicit specified, e.g., 1881202379Srdivacky/// "std::vector" or "x->member", or as part of unqualified name lookup. 1882193326Sed/// 1883193326Sed/// Different lookup criteria can find different names. For example, a 1884193326Sed/// particular scope can have both a struct and a function of the same 1885193326Sed/// name, and each can be found by certain lookup criteria. For more 1886193326Sed/// information about lookup criteria, see the documentation for the 1887193326Sed/// class LookupCriteria. 1888193326Sed/// 1889202379Srdivacky/// \param R captures both the lookup criteria and any lookup results found. 1890202379Srdivacky/// 1891202379Srdivacky/// \param LookupCtx The context in which qualified name lookup will 1892193326Sed/// search. If the lookup criteria permits, name lookup may also search 1893193326Sed/// in the parent contexts or (for C++ classes) base classes. 1894193326Sed/// 1895218893Sdim/// \param InUnqualifiedLookup true if this is qualified name lookup that 1896202379Srdivacky/// occurs as part of unqualified name lookup. 1897193326Sed/// 1898202379Srdivacky/// \returns true if lookup succeeded, false if it failed. 1899202379Srdivackybool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx, 1900202379Srdivacky bool InUnqualifiedLookup) { 1901193326Sed assert(LookupCtx && "Sema::LookupQualifiedName requires a lookup context"); 1902193326Sed 1903199482Srdivacky if (!R.getLookupName()) 1904198092Srdivacky return false; 1905198092Srdivacky 1906198092Srdivacky // Make sure that the declaration context is complete. 1907198092Srdivacky assert((!isa<TagDecl>(LookupCtx) || 1908198092Srdivacky LookupCtx->isDependentContext() || 1909226633Sdim cast<TagDecl>(LookupCtx)->isCompleteDefinition() || 1910234353Sdim cast<TagDecl>(LookupCtx)->isBeingDefined()) && 1911198092Srdivacky "Declaration context must already be complete!"); 1912198092Srdivacky 1913296417Sdim struct QualifiedLookupInScope { 1914296417Sdim bool oldVal; 1915296417Sdim DeclContext *Context; 1916296417Sdim // Set flag in DeclContext informing debugger that we're looking for qualified name 1917296417Sdim QualifiedLookupInScope(DeclContext *ctx) : Context(ctx) { 1918296417Sdim oldVal = ctx->setUseQualifiedLookup(); 1919296417Sdim } 1920296417Sdim ~QualifiedLookupInScope() { 1921296417Sdim Context->setUseQualifiedLookup(oldVal); 1922296417Sdim } 1923296417Sdim } QL(LookupCtx); 1924296417Sdim 1925203955Srdivacky if (LookupDirect(*this, R, LookupCtx)) { 1926198092Srdivacky R.resolveKind(); 1927202879Srdivacky if (isa<CXXRecordDecl>(LookupCtx)) 1928202879Srdivacky R.setNamingClass(cast<CXXRecordDecl>(LookupCtx)); 1929198092Srdivacky return true; 1930198092Srdivacky } 1931193326Sed 1932198092Srdivacky // Don't descend into implied contexts for redeclarations. 1933198092Srdivacky // C++98 [namespace.qual]p6: 1934198092Srdivacky // In a declaration for a namespace member in which the 1935198092Srdivacky // declarator-id is a qualified-id, given that the qualified-id 1936198092Srdivacky // for the namespace member has the form 1937198092Srdivacky // nested-name-specifier unqualified-id 1938198092Srdivacky // the unqualified-id shall name a member of the namespace 1939198092Srdivacky // designated by the nested-name-specifier. 1940198092Srdivacky // See also [class.mfct]p5 and [class.static.data]p2. 1941199482Srdivacky if (R.isForRedeclaration()) 1942198092Srdivacky return false; 1943198092Srdivacky 1944199482Srdivacky // If this is a namespace, look it up in the implied namespaces. 1945198092Srdivacky if (LookupCtx->isFileContext()) 1946203955Srdivacky return LookupQualifiedNameInUsingDirectives(*this, R, LookupCtx); 1947198092Srdivacky 1948198092Srdivacky // If this isn't a C++ class, we aren't allowed to look into base 1949193326Sed // classes, we're done. 1950202379Srdivacky CXXRecordDecl *LookupRec = dyn_cast<CXXRecordDecl>(LookupCtx); 1951210299Sed if (!LookupRec || !LookupRec->getDefinition()) 1952198092Srdivacky return false; 1953193326Sed 1954202379Srdivacky // If we're performing qualified name lookup into a dependent class, 1955202379Srdivacky // then we are actually looking into a current instantiation. If we have any 1956218893Sdim // dependent base classes, then we either have to delay lookup until 1957202379Srdivacky // template instantiation time (at which point all bases will be available) 1958202379Srdivacky // or we have to fail. 1959202379Srdivacky if (!InUnqualifiedLookup && LookupRec->isDependentContext() && 1960202379Srdivacky LookupRec->hasAnyDependentBases()) { 1961202379Srdivacky R.setNotFoundInCurrentInstantiation(); 1962202379Srdivacky return false; 1963202379Srdivacky } 1964218893Sdim 1965193326Sed // Perform lookup into our base classes. 1966198092Srdivacky CXXBasePaths Paths; 1967198092Srdivacky Paths.setOrigin(LookupRec); 1968193326Sed 1969193326Sed // Look for this member in our base classes 1970296417Sdim bool (*BaseCallback)(const CXXBaseSpecifier *Specifier, CXXBasePath &Path, 1971296417Sdim DeclarationName Name) = nullptr; 1972199482Srdivacky switch (R.getLookupKind()) { 1973224145Sdim case LookupObjCImplicitSelfParam: 1974198092Srdivacky case LookupOrdinaryName: 1975198092Srdivacky case LookupMemberName: 1976198092Srdivacky case LookupRedeclarationWithLinkage: 1977261991Sdim case LookupLocalFriendName: 1978198092Srdivacky BaseCallback = &CXXRecordDecl::FindOrdinaryMember; 1979198092Srdivacky break; 1980218893Sdim 1981198092Srdivacky case LookupTagName: 1982198092Srdivacky BaseCallback = &CXXRecordDecl::FindTagMember; 1983198092Srdivacky break; 1984200583Srdivacky 1985212904Sdim case LookupAnyName: 1986212904Sdim BaseCallback = &LookupAnyMember; 1987212904Sdim break; 1988218893Sdim 1989200583Srdivacky case LookupUsingDeclName: 1990200583Srdivacky // This lookup is for redeclarations only. 1991218893Sdim 1992198092Srdivacky case LookupOperatorName: 1993198092Srdivacky case LookupNamespaceName: 1994198092Srdivacky case LookupObjCProtocolName: 1995218893Sdim case LookupLabel: 1996198092Srdivacky // These lookups will never find a member in a C++ class (or base class). 1997198092Srdivacky return false; 1998218893Sdim 1999198092Srdivacky case LookupNestedNameSpecifierName: 2000198092Srdivacky BaseCallback = &CXXRecordDecl::FindNestedNameSpecifierMember; 2001198092Srdivacky break; 2002198092Srdivacky } 2003218893Sdim 2004296417Sdim DeclarationName Name = R.getLookupName(); 2005296417Sdim if (!LookupRec->lookupInBases( 2006296417Sdim [=](const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { 2007296417Sdim return BaseCallback(Specifier, Path, Name); 2008296417Sdim }, 2009296417Sdim Paths)) 2010198092Srdivacky return false; 2011193326Sed 2012202879Srdivacky R.setNamingClass(LookupRec); 2013202879Srdivacky 2014193326Sed // C++ [class.member.lookup]p2: 2015193326Sed // [...] If the resulting set of declarations are not all from 2016193326Sed // sub-objects of the same type, or the set has a nonstatic member 2017193326Sed // and includes members from distinct sub-objects, there is an 2018193326Sed // ambiguity and the program is ill-formed. Otherwise that set is 2019193326Sed // the result of the lookup. 2020193326Sed QualType SubobjectType; 2021193326Sed int SubobjectNumber = 0; 2022205408Srdivacky AccessSpecifier SubobjectAccess = AS_none; 2023218893Sdim 2024198092Srdivacky for (CXXBasePaths::paths_iterator Path = Paths.begin(), PathEnd = Paths.end(); 2025193326Sed Path != PathEnd; ++Path) { 2026198092Srdivacky const CXXBasePathElement &PathElement = Path->back(); 2027193326Sed 2028202879Srdivacky // Pick the best (i.e. most permissive i.e. numerically lowest) access 2029202879Srdivacky // across all paths. 2030202879Srdivacky SubobjectAccess = std::min(SubobjectAccess, Path->Access); 2031218893Sdim 2032193326Sed // Determine whether we're looking at a distinct sub-object or not. 2033193326Sed if (SubobjectType.isNull()) { 2034198092Srdivacky // This is the first subobject we've looked at. Record its type. 2035193326Sed SubobjectType = Context.getCanonicalType(PathElement.Base->getType()); 2036193326Sed SubobjectNumber = PathElement.SubobjectNumber; 2037218893Sdim continue; 2038218893Sdim } 2039218893Sdim 2040218893Sdim if (SubobjectType 2041193326Sed != Context.getCanonicalType(PathElement.Base->getType())) { 2042193326Sed // We found members of the given name in two subobjects of 2043218893Sdim // different types. If the declaration sets aren't the same, this 2044276479Sdim // lookup is ambiguous. 2045249423Sdim if (HasOnlyStaticMembers(Path->Decls.begin(), Path->Decls.end())) { 2046218893Sdim CXXBasePaths::paths_iterator FirstPath = Paths.begin(); 2047249423Sdim DeclContext::lookup_iterator FirstD = FirstPath->Decls.begin(); 2048249423Sdim DeclContext::lookup_iterator CurrentD = Path->Decls.begin(); 2049218893Sdim 2050249423Sdim while (FirstD != FirstPath->Decls.end() && 2051249423Sdim CurrentD != Path->Decls.end()) { 2052218893Sdim if ((*FirstD)->getUnderlyingDecl()->getCanonicalDecl() != 2053218893Sdim (*CurrentD)->getUnderlyingDecl()->getCanonicalDecl()) 2054218893Sdim break; 2055218893Sdim 2056218893Sdim ++FirstD; 2057218893Sdim ++CurrentD; 2058218893Sdim } 2059218893Sdim 2060249423Sdim if (FirstD == FirstPath->Decls.end() && 2061249423Sdim CurrentD == Path->Decls.end()) 2062218893Sdim continue; 2063218893Sdim } 2064218893Sdim 2065198092Srdivacky R.setAmbiguousBaseSubobjectTypes(Paths); 2066198092Srdivacky return true; 2067218893Sdim } 2068218893Sdim 2069218893Sdim if (SubobjectNumber != PathElement.SubobjectNumber) { 2070193326Sed // We have a different subobject of the same type. 2071193326Sed 2072193326Sed // C++ [class.member.lookup]p5: 2073193326Sed // A static member, a nested type or an enumerator defined in 2074193326Sed // a base class T can unambiguously be found even if an object 2075198092Srdivacky // has more than one base class subobject of type T. 2076249423Sdim if (HasOnlyStaticMembers(Path->Decls.begin(), Path->Decls.end())) 2077193326Sed continue; 2078193326Sed 2079193326Sed // We have found a nonstatic member name in multiple, distinct 2080193326Sed // subobjects. Name lookup is ambiguous. 2081198092Srdivacky R.setAmbiguousBaseSubobjects(Paths); 2082198092Srdivacky return true; 2083193326Sed } 2084193326Sed } 2085193326Sed 2086193326Sed // Lookup in a base class succeeded; return these results. 2087193326Sed 2088276479Sdim for (auto *D : Paths.front().Decls) { 2089202879Srdivacky AccessSpecifier AS = CXXRecordDecl::MergeAccess(SubobjectAccess, 2090202879Srdivacky D->getAccess()); 2091202879Srdivacky R.addDecl(D, AS); 2092202879Srdivacky } 2093198092Srdivacky R.resolveKind(); 2094198092Srdivacky return true; 2095193326Sed} 2096193326Sed 2097280031Sdim/// \brief Performs qualified name lookup or special type of lookup for 2098280031Sdim/// "__super::" scope specifier. 2099280031Sdim/// 2100280031Sdim/// This routine is a convenience overload meant to be called from contexts 2101280031Sdim/// that need to perform a qualified name lookup with an optional C++ scope 2102280031Sdim/// specifier that might require special kind of lookup. 2103280031Sdim/// 2104280031Sdim/// \param R captures both the lookup criteria and any lookup results found. 2105280031Sdim/// 2106280031Sdim/// \param LookupCtx The context in which qualified name lookup will 2107280031Sdim/// search. 2108280031Sdim/// 2109280031Sdim/// \param SS An optional C++ scope-specifier. 2110280031Sdim/// 2111280031Sdim/// \returns true if lookup succeeded, false if it failed. 2112280031Sdimbool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx, 2113280031Sdim CXXScopeSpec &SS) { 2114280031Sdim auto *NNS = SS.getScopeRep(); 2115280031Sdim if (NNS && NNS->getKind() == NestedNameSpecifier::Super) 2116280031Sdim return LookupInSuper(R, NNS->getAsRecordDecl()); 2117280031Sdim else 2118280031Sdim 2119280031Sdim return LookupQualifiedName(R, LookupCtx); 2120280031Sdim} 2121280031Sdim 2122193326Sed/// @brief Performs name lookup for a name that was parsed in the 2123193326Sed/// source code, and may contain a C++ scope specifier. 2124193326Sed/// 2125193326Sed/// This routine is a convenience routine meant to be called from 2126193326Sed/// contexts that receive a name and an optional C++ scope specifier 2127193326Sed/// (e.g., "N::M::x"). It will then perform either qualified or 2128193326Sed/// unqualified name lookup (with LookupQualifiedName or LookupName, 2129280031Sdim/// respectively) on the given name and return those results. It will 2130280031Sdim/// perform a special type of lookup for "__super::" scope specifier. 2131193326Sed/// 2132193326Sed/// @param S The scope from which unqualified name lookup will 2133193326Sed/// begin. 2134193326Sed/// 2135198092Srdivacky/// @param SS An optional C++ scope-specifier, e.g., "::N::M". 2136198092Srdivacky/// 2137198092Srdivacky/// @param EnteringContext Indicates whether we are going to enter the 2138198092Srdivacky/// context of the scope-specifier SS (if present). 2139198092Srdivacky/// 2140198092Srdivacky/// @returns True if any decls were found (but possibly ambiguous) 2141207619Srdivackybool Sema::LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS, 2142199482Srdivacky bool AllowBuiltinCreation, bool EnteringContext) { 2143198092Srdivacky if (SS && SS->isInvalid()) { 2144198092Srdivacky // When the scope specifier is invalid, don't even look for 2145193326Sed // anything. 2146198092Srdivacky return false; 2147198092Srdivacky } 2148193326Sed 2149198092Srdivacky if (SS && SS->isSet()) { 2150280031Sdim NestedNameSpecifier *NNS = SS->getScopeRep(); 2151280031Sdim if (NNS->getKind() == NestedNameSpecifier::Super) 2152280031Sdim return LookupInSuper(R, NNS->getAsRecordDecl()); 2153280031Sdim 2154198092Srdivacky if (DeclContext *DC = computeDeclContext(*SS, EnteringContext)) { 2155198092Srdivacky // We have resolved the scope specifier to a particular declaration 2156198092Srdivacky // contex, and will perform name lookup in that context. 2157207619Srdivacky if (!DC->isDependentContext() && RequireCompleteDeclContext(*SS, DC)) 2158198092Srdivacky return false; 2159193326Sed 2160199482Srdivacky R.setContextRange(SS->getRange()); 2161199482Srdivacky return LookupQualifiedName(R, DC); 2162193326Sed } 2163193326Sed 2164198092Srdivacky // We could not resolve the scope specified to a specific declaration 2165198092Srdivacky // context, which means that SS refers to an unknown specialization. 2166198092Srdivacky // Name lookup can't find anything in this case. 2167234353Sdim R.setNotFoundInCurrentInstantiation(); 2168234353Sdim R.setContextRange(SS->getRange()); 2169198092Srdivacky return false; 2170193326Sed } 2171193326Sed 2172198092Srdivacky // Perform unqualified name lookup starting in the given scope. 2173199482Srdivacky return LookupName(R, S, AllowBuiltinCreation); 2174193326Sed} 2175193326Sed 2176280031Sdim/// \brief Perform qualified name lookup into all base classes of the given 2177280031Sdim/// class. 2178280031Sdim/// 2179280031Sdim/// \param R captures both the lookup criteria and any lookup results found. 2180280031Sdim/// 2181280031Sdim/// \param Class The context in which qualified name lookup will 2182280031Sdim/// search. Name lookup will search in all base classes merging the results. 2183280031Sdim/// 2184280031Sdim/// @returns True if any decls were found (but possibly ambiguous) 2185280031Sdimbool Sema::LookupInSuper(LookupResult &R, CXXRecordDecl *Class) { 2186296417Sdim // The access-control rules we use here are essentially the rules for 2187296417Sdim // doing a lookup in Class that just magically skipped the direct 2188296417Sdim // members of Class itself. That is, the naming class is Class, and the 2189296417Sdim // access includes the access of the base. 2190280031Sdim for (const auto &BaseSpec : Class->bases()) { 2191280031Sdim CXXRecordDecl *RD = cast<CXXRecordDecl>( 2192280031Sdim BaseSpec.getType()->castAs<RecordType>()->getDecl()); 2193280031Sdim LookupResult Result(*this, R.getLookupNameInfo(), R.getLookupKind()); 2194280031Sdim Result.setBaseObjectType(Context.getRecordType(Class)); 2195280031Sdim LookupQualifiedName(Result, RD); 2196296417Sdim 2197296417Sdim // Copy the lookup results into the target, merging the base's access into 2198296417Sdim // the path access. 2199296417Sdim for (auto I = Result.begin(), E = Result.end(); I != E; ++I) { 2200296417Sdim R.addDecl(I.getDecl(), 2201296417Sdim CXXRecordDecl::MergeAccess(BaseSpec.getAccessSpecifier(), 2202296417Sdim I.getAccess())); 2203296417Sdim } 2204296417Sdim 2205296417Sdim Result.suppressDiagnostics(); 2206280031Sdim } 2207193326Sed 2208280031Sdim R.resolveKind(); 2209296417Sdim R.setNamingClass(Class); 2210280031Sdim 2211280031Sdim return !R.empty(); 2212280031Sdim} 2213280031Sdim 2214239462Sdim/// \brief Produce a diagnostic describing the ambiguity that resulted 2215193326Sed/// from name lookup. 2216193326Sed/// 2217239462Sdim/// \param Result The result of the ambiguous lookup to be diagnosed. 2218261991Sdimvoid Sema::DiagnoseAmbiguousLookup(LookupResult &Result) { 2219193326Sed assert(Result.isAmbiguous() && "Lookup result must be ambiguous"); 2220193326Sed 2221199482Srdivacky DeclarationName Name = Result.getLookupName(); 2222199482Srdivacky SourceLocation NameLoc = Result.getNameLoc(); 2223199482Srdivacky SourceRange LookupRange = Result.getContextRange(); 2224199482Srdivacky 2225198092Srdivacky switch (Result.getAmbiguityKind()) { 2226198092Srdivacky case LookupResult::AmbiguousBaseSubobjects: { 2227198092Srdivacky CXXBasePaths *Paths = Result.getBasePaths(); 2228198092Srdivacky QualType SubobjectType = Paths->front().back().Base->getType(); 2229198092Srdivacky Diag(NameLoc, diag::err_ambiguous_member_multiple_subobjects) 2230198092Srdivacky << Name << SubobjectType << getAmbiguousPathsDisplayString(*Paths) 2231198092Srdivacky << LookupRange; 2232218893Sdim 2233249423Sdim DeclContext::lookup_iterator Found = Paths->front().Decls.begin(); 2234198092Srdivacky while (isa<CXXMethodDecl>(*Found) && 2235198092Srdivacky cast<CXXMethodDecl>(*Found)->isStatic()) 2236198092Srdivacky ++Found; 2237218893Sdim 2238198092Srdivacky Diag((*Found)->getLocation(), diag::note_ambiguous_member_found); 2239261991Sdim break; 2240198092Srdivacky } 2241193326Sed 2242198092Srdivacky case LookupResult::AmbiguousBaseSubobjectTypes: { 2243193326Sed Diag(NameLoc, diag::err_ambiguous_member_multiple_subobject_types) 2244193326Sed << Name << LookupRange; 2245218893Sdim 2246198092Srdivacky CXXBasePaths *Paths = Result.getBasePaths(); 2247193326Sed std::set<Decl *> DeclsPrinted; 2248198092Srdivacky for (CXXBasePaths::paths_iterator Path = Paths->begin(), 2249198092Srdivacky PathEnd = Paths->end(); 2250193326Sed Path != PathEnd; ++Path) { 2251249423Sdim Decl *D = Path->Decls.front(); 2252193326Sed if (DeclsPrinted.insert(D).second) 2253193326Sed Diag(D->getLocation(), diag::note_ambiguous_member_found); 2254193326Sed } 2255261991Sdim break; 2256198092Srdivacky } 2257193326Sed 2258198092Srdivacky case LookupResult::AmbiguousTagHiding: { 2259198092Srdivacky Diag(NameLoc, diag::err_ambiguous_tag_hiding) << Name << LookupRange; 2260193326Sed 2261296417Sdim llvm::SmallPtrSet<NamedDecl*, 8> TagDecls; 2262198092Srdivacky 2263276479Sdim for (auto *D : Result) 2264276479Sdim if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 2265198092Srdivacky TagDecls.insert(TD); 2266198092Srdivacky Diag(TD->getLocation(), diag::note_hidden_tag); 2267198092Srdivacky } 2268198092Srdivacky 2269276479Sdim for (auto *D : Result) 2270276479Sdim if (!isa<TagDecl>(D)) 2271276479Sdim Diag(D->getLocation(), diag::note_hiding_object); 2272198092Srdivacky 2273198092Srdivacky // For recovery purposes, go ahead and implement the hiding. 2274202879Srdivacky LookupResult::Filter F = Result.makeFilter(); 2275202879Srdivacky while (F.hasNext()) { 2276202879Srdivacky if (TagDecls.count(F.next())) 2277202879Srdivacky F.erase(); 2278202879Srdivacky } 2279202879Srdivacky F.done(); 2280261991Sdim break; 2281198092Srdivacky } 2282198092Srdivacky 2283198092Srdivacky case LookupResult::AmbiguousReference: { 2284198092Srdivacky Diag(NameLoc, diag::err_ambiguous_reference) << Name << LookupRange; 2285218893Sdim 2286276479Sdim for (auto *D : Result) 2287276479Sdim Diag(D->getLocation(), diag::note_ambiguous_candidate) << D; 2288261991Sdim break; 2289193326Sed } 2290198092Srdivacky } 2291193326Sed} 2292193326Sed 2293210299Sednamespace { 2294210299Sed struct AssociatedLookup { 2295243830Sdim AssociatedLookup(Sema &S, SourceLocation InstantiationLoc, 2296210299Sed Sema::AssociatedNamespaceSet &Namespaces, 2297210299Sed Sema::AssociatedClassSet &Classes) 2298243830Sdim : S(S), Namespaces(Namespaces), Classes(Classes), 2299243830Sdim InstantiationLoc(InstantiationLoc) { 2300210299Sed } 2301210299Sed 2302210299Sed Sema &S; 2303210299Sed Sema::AssociatedNamespaceSet &Namespaces; 2304210299Sed Sema::AssociatedClassSet &Classes; 2305243830Sdim SourceLocation InstantiationLoc; 2306210299Sed }; 2307296417Sdim} // end anonymous namespace 2308210299Sed 2309198092Srdivackystatic void 2310210299SedaddAssociatedClassesAndNamespaces(AssociatedLookup &Result, QualType T); 2311198092Srdivacky 2312207619Srdivackystatic void CollectEnclosingNamespace(Sema::AssociatedNamespaceSet &Namespaces, 2313207619Srdivacky DeclContext *Ctx) { 2314207619Srdivacky // Add the associated namespace for this class. 2315207619Srdivacky 2316207619Srdivacky // We don't use DeclContext::getEnclosingNamespaceContext() as this may 2317207619Srdivacky // be a locally scoped record. 2318207619Srdivacky 2319212904Sdim // We skip out of inline namespaces. The innermost non-inline namespace 2320212904Sdim // contains all names of all its nested inline namespaces anyway, so we can 2321212904Sdim // replace the entire inline namespace tree with its root. 2322212904Sdim while (Ctx->isRecord() || Ctx->isTransparentContext() || 2323212904Sdim Ctx->isInlineNamespace()) 2324207619Srdivacky Ctx = Ctx->getParent(); 2325207619Srdivacky 2326198092Srdivacky if (Ctx->isFileContext()) 2327207619Srdivacky Namespaces.insert(Ctx->getPrimaryContext()); 2328198092Srdivacky} 2329198092Srdivacky 2330198092Srdivacky// \brief Add the associated classes and namespaces for argument-dependent 2331198092Srdivacky// lookup that involves a template argument (C++ [basic.lookup.koenig]p2). 2332198092Srdivackystatic void 2333210299SedaddAssociatedClassesAndNamespaces(AssociatedLookup &Result, 2334210299Sed const TemplateArgument &Arg) { 2335198092Srdivacky // C++ [basic.lookup.koenig]p2, last bullet: 2336198092Srdivacky // -- [...] ; 2337198092Srdivacky switch (Arg.getKind()) { 2338198092Srdivacky case TemplateArgument::Null: 2339198092Srdivacky break; 2340198092Srdivacky 2341198092Srdivacky case TemplateArgument::Type: 2342198092Srdivacky // [...] the namespaces and classes associated with the types of the 2343198092Srdivacky // template arguments provided for template type parameters (excluding 2344198092Srdivacky // template template parameters) 2345210299Sed addAssociatedClassesAndNamespaces(Result, Arg.getAsType()); 2346198092Srdivacky break; 2347198092Srdivacky 2348218893Sdim case TemplateArgument::Template: 2349218893Sdim case TemplateArgument::TemplateExpansion: { 2350198092Srdivacky // [...] the namespaces in which any template template arguments are 2351198092Srdivacky // defined; and the classes in which any member templates used as 2352198092Srdivacky // template template arguments are defined. 2353218893Sdim TemplateName Template = Arg.getAsTemplateOrTemplatePattern(); 2354198092Srdivacky if (ClassTemplateDecl *ClassTemplate 2355199482Srdivacky = dyn_cast<ClassTemplateDecl>(Template.getAsTemplateDecl())) { 2356198092Srdivacky DeclContext *Ctx = ClassTemplate->getDeclContext(); 2357198092Srdivacky if (CXXRecordDecl *EnclosingClass = dyn_cast<CXXRecordDecl>(Ctx)) 2358210299Sed Result.Classes.insert(EnclosingClass); 2359198092Srdivacky // Add the associated namespace for this class. 2360210299Sed CollectEnclosingNamespace(Result.Namespaces, Ctx); 2361198092Srdivacky } 2362198092Srdivacky break; 2363199482Srdivacky } 2364218893Sdim 2365199482Srdivacky case TemplateArgument::Declaration: 2366198092Srdivacky case TemplateArgument::Integral: 2367198092Srdivacky case TemplateArgument::Expression: 2368243830Sdim case TemplateArgument::NullPtr: 2369198092Srdivacky // [Note: non-type template arguments do not contribute to the set of 2370198092Srdivacky // associated namespaces. ] 2371198092Srdivacky break; 2372198092Srdivacky 2373198092Srdivacky case TemplateArgument::Pack: 2374276479Sdim for (const auto &P : Arg.pack_elements()) 2375276479Sdim addAssociatedClassesAndNamespaces(Result, P); 2376198092Srdivacky break; 2377198092Srdivacky } 2378198092Srdivacky} 2379198092Srdivacky 2380193326Sed// \brief Add the associated classes and namespaces for 2381198092Srdivacky// argument-dependent lookup with an argument of class type 2382198092Srdivacky// (C++ [basic.lookup.koenig]p2). 2383198092Srdivackystatic void 2384210299SedaddAssociatedClassesAndNamespaces(AssociatedLookup &Result, 2385210299Sed CXXRecordDecl *Class) { 2386210299Sed 2387210299Sed // Just silently ignore anything whose name is __va_list_tag. 2388210299Sed if (Class->getDeclName() == Result.S.VAListTagName) 2389210299Sed return; 2390210299Sed 2391193326Sed // C++ [basic.lookup.koenig]p2: 2392193326Sed // [...] 2393193326Sed // -- If T is a class type (including unions), its associated 2394193326Sed // classes are: the class itself; the class of which it is a 2395193326Sed // member, if any; and its direct and indirect base 2396193326Sed // classes. Its associated namespaces are the namespaces in 2397198092Srdivacky // which its associated classes are defined. 2398193326Sed 2399193326Sed // Add the class of which it is a member, if any. 2400193326Sed DeclContext *Ctx = Class->getDeclContext(); 2401193326Sed if (CXXRecordDecl *EnclosingClass = dyn_cast<CXXRecordDecl>(Ctx)) 2402210299Sed Result.Classes.insert(EnclosingClass); 2403193326Sed // Add the associated namespace for this class. 2404210299Sed CollectEnclosingNamespace(Result.Namespaces, Ctx); 2405198092Srdivacky 2406193326Sed // Add the class itself. If we've already seen this class, we don't 2407193326Sed // need to visit base classes. 2408276479Sdim // 2409276479Sdim // FIXME: That's not correct, we may have added this class only because it 2410276479Sdim // was the enclosing class of another class, and in that case we won't have 2411276479Sdim // added its base classes yet. 2412280031Sdim if (!Result.Classes.insert(Class).second) 2413193326Sed return; 2414193326Sed 2415198092Srdivacky // -- If T is a template-id, its associated namespaces and classes are 2416198092Srdivacky // the namespace in which the template is defined; for member 2417218893Sdim // templates, the member template's class; the namespaces and classes 2418198092Srdivacky // associated with the types of the template arguments provided for 2419198092Srdivacky // template type parameters (excluding template template parameters); the 2420198092Srdivacky // namespaces in which any template template arguments are defined; and 2421198092Srdivacky // the classes in which any member templates used as template template 2422198092Srdivacky // arguments are defined. [Note: non-type template arguments do not 2423198092Srdivacky // contribute to the set of associated namespaces. ] 2424198092Srdivacky if (ClassTemplateSpecializationDecl *Spec 2425198092Srdivacky = dyn_cast<ClassTemplateSpecializationDecl>(Class)) { 2426198092Srdivacky DeclContext *Ctx = Spec->getSpecializedTemplate()->getDeclContext(); 2427198092Srdivacky if (CXXRecordDecl *EnclosingClass = dyn_cast<CXXRecordDecl>(Ctx)) 2428210299Sed Result.Classes.insert(EnclosingClass); 2429198092Srdivacky // Add the associated namespace for this class. 2430210299Sed CollectEnclosingNamespace(Result.Namespaces, Ctx); 2431193326Sed 2432198092Srdivacky const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 2433198092Srdivacky for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) 2434210299Sed addAssociatedClassesAndNamespaces(Result, TemplateArgs[I]); 2435198092Srdivacky } 2436198092Srdivacky 2437203955Srdivacky // Only recurse into base classes for complete types. 2438296417Sdim if (!Result.S.isCompleteType(Result.InstantiationLoc, 2439296417Sdim Result.S.Context.getRecordType(Class))) 2440276479Sdim return; 2441203955Srdivacky 2442193326Sed // Add direct and indirect base classes along with their associated 2443193326Sed // namespaces. 2444226633Sdim SmallVector<CXXRecordDecl *, 32> Bases; 2445193326Sed Bases.push_back(Class); 2446193326Sed while (!Bases.empty()) { 2447193326Sed // Pop this class off the stack. 2448261991Sdim Class = Bases.pop_back_val(); 2449193326Sed 2450193326Sed // Visit the base classes. 2451276479Sdim for (const auto &Base : Class->bases()) { 2452276479Sdim const RecordType *BaseType = Base.getType()->getAs<RecordType>(); 2453198893Srdivacky // In dependent contexts, we do ADL twice, and the first time around, 2454198893Srdivacky // the base type might be a dependent TemplateSpecializationType, or a 2455198893Srdivacky // TemplateTypeParmType. If that happens, simply ignore it. 2456198893Srdivacky // FIXME: If we want to support export, we probably need to add the 2457198893Srdivacky // namespace of the template in a TemplateSpecializationType, or even 2458198893Srdivacky // the classes and namespaces of known non-dependent arguments. 2459198893Srdivacky if (!BaseType) 2460198893Srdivacky continue; 2461193326Sed CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 2462280031Sdim if (Result.Classes.insert(BaseDecl).second) { 2463193326Sed // Find the associated namespace for this base class. 2464193326Sed DeclContext *BaseCtx = BaseDecl->getDeclContext(); 2465210299Sed CollectEnclosingNamespace(Result.Namespaces, BaseCtx); 2466193326Sed 2467193326Sed // Make sure we visit the bases of this base class. 2468193326Sed if (BaseDecl->bases_begin() != BaseDecl->bases_end()) 2469193326Sed Bases.push_back(BaseDecl); 2470193326Sed } 2471193326Sed } 2472193326Sed } 2473193326Sed} 2474193326Sed 2475193326Sed// \brief Add the associated classes and namespaces for 2476193326Sed// argument-dependent lookup with an argument of type T 2477198092Srdivacky// (C++ [basic.lookup.koenig]p2). 2478198092Srdivackystatic void 2479210299SedaddAssociatedClassesAndNamespaces(AssociatedLookup &Result, QualType Ty) { 2480193326Sed // C++ [basic.lookup.koenig]p2: 2481193326Sed // 2482193326Sed // For each argument type T in the function call, there is a set 2483193326Sed // of zero or more associated namespaces and a set of zero or more 2484193326Sed // associated classes to be considered. The sets of namespaces and 2485193326Sed // classes is determined entirely by the types of the function 2486193326Sed // arguments (and the namespace of any template template 2487193326Sed // argument). Typedef names and using-declarations used to specify 2488193326Sed // the types do not contribute to this set. The sets of namespaces 2489193326Sed // and classes are determined in the following way: 2490193326Sed 2491226633Sdim SmallVector<const Type *, 16> Queue; 2492210299Sed const Type *T = Ty->getCanonicalTypeInternal().getTypePtr(); 2493210299Sed 2494193326Sed while (true) { 2495210299Sed switch (T->getTypeClass()) { 2496210299Sed 2497210299Sed#define TYPE(Class, Base) 2498210299Sed#define DEPENDENT_TYPE(Class, Base) case Type::Class: 2499210299Sed#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 2500210299Sed#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 2501210299Sed#define ABSTRACT_TYPE(Class, Base) 2502210299Sed#include "clang/AST/TypeNodes.def" 2503210299Sed // T is canonical. We can also ignore dependent types because 2504210299Sed // we don't need to do ADL at the definition point, but if we 2505210299Sed // wanted to implement template export (or if we find some other 2506210299Sed // use for associated classes and namespaces...) this would be 2507210299Sed // wrong. 2508193326Sed break; 2509193326Sed 2510210299Sed // -- If T is a pointer to U or an array of U, its associated 2511210299Sed // namespaces and classes are those associated with U. 2512210299Sed case Type::Pointer: 2513210299Sed T = cast<PointerType>(T)->getPointeeType().getTypePtr(); 2514210299Sed continue; 2515210299Sed case Type::ConstantArray: 2516210299Sed case Type::IncompleteArray: 2517210299Sed case Type::VariableArray: 2518210299Sed T = cast<ArrayType>(T)->getElementType().getTypePtr(); 2519210299Sed continue; 2520193326Sed 2521210299Sed // -- If T is a fundamental type, its associated sets of 2522210299Sed // namespaces and classes are both empty. 2523210299Sed case Type::Builtin: 2524210299Sed break; 2525210299Sed 2526210299Sed // -- If T is a class type (including unions), its associated 2527210299Sed // classes are: the class itself; the class of which it is a 2528210299Sed // member, if any; and its direct and indirect base 2529210299Sed // classes. Its associated namespaces are the namespaces in 2530210299Sed // which its associated classes are defined. 2531210299Sed case Type::Record: { 2532296417Sdim CXXRecordDecl *Class = 2533296417Sdim cast<CXXRecordDecl>(cast<RecordType>(T)->getDecl()); 2534210299Sed addAssociatedClassesAndNamespaces(Result, Class); 2535210299Sed break; 2536193326Sed } 2537193326Sed 2538210299Sed // -- If T is an enumeration type, its associated namespace is 2539210299Sed // the namespace in which it is defined. If it is class 2540218893Sdim // member, its associated class is the member's class; else 2541210299Sed // it has no associated class. 2542210299Sed case Type::Enum: { 2543210299Sed EnumDecl *Enum = cast<EnumType>(T)->getDecl(); 2544193326Sed 2545210299Sed DeclContext *Ctx = Enum->getDeclContext(); 2546210299Sed if (CXXRecordDecl *EnclosingClass = dyn_cast<CXXRecordDecl>(Ctx)) 2547210299Sed Result.Classes.insert(EnclosingClass); 2548193326Sed 2549210299Sed // Add the associated namespace for this class. 2550210299Sed CollectEnclosingNamespace(Result.Namespaces, Ctx); 2551193326Sed 2552210299Sed break; 2553210299Sed } 2554193326Sed 2555210299Sed // -- If T is a function type, its associated namespaces and 2556210299Sed // classes are those associated with the function parameter 2557210299Sed // types and those associated with the return type. 2558210299Sed case Type::FunctionProto: { 2559210299Sed const FunctionProtoType *Proto = cast<FunctionProtoType>(T); 2560276479Sdim for (const auto &Arg : Proto->param_types()) 2561276479Sdim Queue.push_back(Arg.getTypePtr()); 2562210299Sed // fallthrough 2563210299Sed } 2564210299Sed case Type::FunctionNoProto: { 2565210299Sed const FunctionType *FnType = cast<FunctionType>(T); 2566276479Sdim T = FnType->getReturnType().getTypePtr(); 2567210299Sed continue; 2568210299Sed } 2569193326Sed 2570210299Sed // -- If T is a pointer to a member function of a class X, its 2571210299Sed // associated namespaces and classes are those associated 2572210299Sed // with the function parameter types and return type, 2573210299Sed // together with those associated with X. 2574210299Sed // 2575210299Sed // -- If T is a pointer to a data member of class X, its 2576210299Sed // associated namespaces and classes are those associated 2577210299Sed // with the member type together with those associated with 2578210299Sed // X. 2579210299Sed case Type::MemberPointer: { 2580210299Sed const MemberPointerType *MemberPtr = cast<MemberPointerType>(T); 2581193326Sed 2582210299Sed // Queue up the class type into which this points. 2583210299Sed Queue.push_back(MemberPtr->getClass()); 2584198092Srdivacky 2585210299Sed // And directly continue with the pointee type. 2586210299Sed T = MemberPtr->getPointeeType().getTypePtr(); 2587210299Sed continue; 2588210299Sed } 2589193326Sed 2590210299Sed // As an extension, treat this like a normal pointer. 2591210299Sed case Type::BlockPointer: 2592210299Sed T = cast<BlockPointerType>(T)->getPointeeType().getTypePtr(); 2593210299Sed continue; 2594193326Sed 2595210299Sed // References aren't covered by the standard, but that's such an 2596210299Sed // obvious defect that we cover them anyway. 2597210299Sed case Type::LValueReference: 2598210299Sed case Type::RValueReference: 2599210299Sed T = cast<ReferenceType>(T)->getPointeeType().getTypePtr(); 2600210299Sed continue; 2601193326Sed 2602210299Sed // These are fundamental types. 2603210299Sed case Type::Vector: 2604210299Sed case Type::ExtVector: 2605210299Sed case Type::Complex: 2606210299Sed break; 2607210299Sed 2608251662Sdim // Non-deduced auto types only get here for error cases. 2609251662Sdim case Type::Auto: 2610251662Sdim break; 2611251662Sdim 2612221345Sdim // If T is an Objective-C object or interface type, or a pointer to an 2613221345Sdim // object or interface type, the associated namespace is the global 2614221345Sdim // namespace. 2615210299Sed case Type::ObjCObject: 2616210299Sed case Type::ObjCInterface: 2617210299Sed case Type::ObjCObjectPointer: 2618221345Sdim Result.Namespaces.insert(Result.S.Context.getTranslationUnitDecl()); 2619210299Sed break; 2620226633Sdim 2621226633Sdim // Atomic types are just wrappers; use the associations of the 2622226633Sdim // contained type. 2623226633Sdim case Type::Atomic: 2624226633Sdim T = cast<AtomicType>(T)->getValueType().getTypePtr(); 2625226633Sdim continue; 2626296417Sdim case Type::Pipe: 2627296417Sdim T = cast<PipeType>(T)->getElementType().getTypePtr(); 2628296417Sdim continue; 2629210299Sed } 2630210299Sed 2631261991Sdim if (Queue.empty()) 2632261991Sdim break; 2633261991Sdim T = Queue.pop_back_val(); 2634193326Sed } 2635193326Sed} 2636193326Sed 2637193326Sed/// \brief Find the associated classes and namespaces for 2638193326Sed/// argument-dependent lookup for a call with the given set of 2639193326Sed/// arguments. 2640193326Sed/// 2641193326Sed/// This routine computes the sets of associated classes and associated 2642198092Srdivacky/// namespaces searched by argument-dependent lookup 2643193326Sed/// (C++ [basic.lookup.argdep]) for a given set of arguments. 2644261991Sdimvoid Sema::FindAssociatedClassesAndNamespaces( 2645261991Sdim SourceLocation InstantiationLoc, ArrayRef<Expr *> Args, 2646261991Sdim AssociatedNamespaceSet &AssociatedNamespaces, 2647261991Sdim AssociatedClassSet &AssociatedClasses) { 2648193326Sed AssociatedNamespaces.clear(); 2649193326Sed AssociatedClasses.clear(); 2650193326Sed 2651243830Sdim AssociatedLookup Result(*this, InstantiationLoc, 2652243830Sdim AssociatedNamespaces, AssociatedClasses); 2653210299Sed 2654193326Sed // C++ [basic.lookup.koenig]p2: 2655193326Sed // For each argument type T in the function call, there is a set 2656193326Sed // of zero or more associated namespaces and a set of zero or more 2657193326Sed // associated classes to be considered. The sets of namespaces and 2658193326Sed // classes is determined entirely by the types of the function 2659193326Sed // arguments (and the namespace of any template template 2660198092Srdivacky // argument). 2661234353Sdim for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) { 2662193326Sed Expr *Arg = Args[ArgIdx]; 2663193326Sed 2664193326Sed if (Arg->getType() != Context.OverloadTy) { 2665210299Sed addAssociatedClassesAndNamespaces(Result, Arg->getType()); 2666193326Sed continue; 2667193326Sed } 2668193326Sed 2669193326Sed // [...] In addition, if the argument is the name or address of a 2670193326Sed // set of overloaded functions and/or function templates, its 2671193326Sed // associated classes and namespaces are the union of those 2672193326Sed // associated with each of the members of the set: the namespace 2673193326Sed // in which the function or function template is defined and the 2674193326Sed // classes and namespaces associated with its (non-dependent) 2675193326Sed // parameter types and return type. 2676198092Srdivacky Arg = Arg->IgnoreParens(); 2677199990Srdivacky if (UnaryOperator *unaryOp = dyn_cast<UnaryOperator>(Arg)) 2678212904Sdim if (unaryOp->getOpcode() == UO_AddrOf) 2679199990Srdivacky Arg = unaryOp->getSubExpr(); 2680193326Sed 2681210299Sed UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(Arg); 2682210299Sed if (!ULE) continue; 2683199990Srdivacky 2684276479Sdim for (const auto *D : ULE->decls()) { 2685201361Srdivacky // Look through any using declarations to find the underlying function. 2686276479Sdim const FunctionDecl *FDecl = D->getUnderlyingDecl()->getAsFunction(); 2687201361Srdivacky 2688193326Sed // Add the classes and namespaces associated with the parameter 2689193326Sed // types and return type of this function. 2690210299Sed addAssociatedClassesAndNamespaces(Result, FDecl->getType()); 2691193326Sed } 2692193326Sed } 2693193326Sed} 2694193326Sed 2695199482SrdivackyNamedDecl *Sema::LookupSingleName(Scope *S, DeclarationName Name, 2696207619Srdivacky SourceLocation Loc, 2697199482Srdivacky LookupNameKind NameKind, 2698199482Srdivacky RedeclarationKind Redecl) { 2699207619Srdivacky LookupResult R(*this, Name, Loc, NameKind, Redecl); 2700199482Srdivacky LookupName(R, S); 2701200583Srdivacky return R.getAsSingle<NamedDecl>(); 2702199482Srdivacky} 2703199482Srdivacky 2704193326Sed/// \brief Find the protocol with the given name, if any. 2705218893SdimObjCProtocolDecl *Sema::LookupProtocol(IdentifierInfo *II, 2706234353Sdim SourceLocation IdLoc, 2707234353Sdim RedeclarationKind Redecl) { 2708207619Srdivacky Decl *D = LookupSingleName(TUScope, II, IdLoc, 2709234353Sdim LookupObjCProtocolName, Redecl); 2710193326Sed return cast_or_null<ObjCProtocolDecl>(D); 2711193326Sed} 2712193326Sed 2713193326Sedvoid Sema::LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S, 2714198092Srdivacky QualType T1, QualType T2, 2715203955Srdivacky UnresolvedSetImpl &Functions) { 2716193326Sed // C++ [over.match.oper]p3: 2717193326Sed // -- The set of non-member candidates is the result of the 2718193326Sed // unqualified lookup of operator@ in the context of the 2719193326Sed // expression according to the usual rules for name lookup in 2720193326Sed // unqualified function calls (3.4.2) except that all member 2721276479Sdim // functions are ignored. 2722193326Sed DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); 2723199482Srdivacky LookupResult Operators(*this, OpName, SourceLocation(), LookupOperatorName); 2724199482Srdivacky LookupName(Operators, S); 2725198092Srdivacky 2726193326Sed assert(!Operators.isAmbiguous() && "Operator lookup cannot be ambiguous"); 2727276479Sdim Functions.append(Operators.begin(), Operators.end()); 2728193326Sed} 2729193326Sed 2730224145SdimSema::SpecialMemberOverloadResult *Sema::LookupSpecialMember(CXXRecordDecl *RD, 2731223017Sdim CXXSpecialMember SM, 2732223017Sdim bool ConstArg, 2733223017Sdim bool VolatileArg, 2734223017Sdim bool RValueThis, 2735223017Sdim bool ConstThis, 2736223017Sdim bool VolatileThis) { 2737249423Sdim assert(CanDeclareSpecialMemberFunction(RD) && 2738249423Sdim "doing special member lookup into record that isn't fully complete"); 2739224145Sdim RD = RD->getDefinition(); 2740223017Sdim if (RValueThis || ConstThis || VolatileThis) 2741223017Sdim assert((SM == CXXCopyAssignment || SM == CXXMoveAssignment) && 2742223017Sdim "constructors and destructors always have unqualified lvalue this"); 2743223017Sdim if (ConstArg || VolatileArg) 2744223017Sdim assert((SM != CXXDefaultConstructor && SM != CXXDestructor) && 2745223017Sdim "parameter-less special members can't have qualified arguments"); 2746223017Sdim 2747223017Sdim llvm::FoldingSetNodeID ID; 2748224145Sdim ID.AddPointer(RD); 2749223017Sdim ID.AddInteger(SM); 2750223017Sdim ID.AddInteger(ConstArg); 2751223017Sdim ID.AddInteger(VolatileArg); 2752223017Sdim ID.AddInteger(RValueThis); 2753223017Sdim ID.AddInteger(ConstThis); 2754223017Sdim ID.AddInteger(VolatileThis); 2755223017Sdim 2756223017Sdim void *InsertPoint; 2757223017Sdim SpecialMemberOverloadResult *Result = 2758223017Sdim SpecialMemberCache.FindNodeOrInsertPos(ID, InsertPoint); 2759223017Sdim 2760223017Sdim // This was already cached 2761223017Sdim if (Result) 2762223017Sdim return Result; 2763223017Sdim 2764223017Sdim Result = BumpAlloc.Allocate<SpecialMemberOverloadResult>(); 2765223017Sdim Result = new (Result) SpecialMemberOverloadResult(ID); 2766223017Sdim SpecialMemberCache.InsertNode(Result, InsertPoint); 2767223017Sdim 2768223017Sdim if (SM == CXXDestructor) { 2769249423Sdim if (RD->needsImplicitDestructor()) 2770224145Sdim DeclareImplicitDestructor(RD); 2771224145Sdim CXXDestructorDecl *DD = RD->getDestructor(); 2772223017Sdim assert(DD && "record without a destructor"); 2773223017Sdim Result->setMethod(DD); 2774234353Sdim Result->setKind(DD->isDeleted() ? 2775234353Sdim SpecialMemberOverloadResult::NoMemberOrDeleted : 2776235864Sdim SpecialMemberOverloadResult::Success); 2777223017Sdim return Result; 2778223017Sdim } 2779223017Sdim 2780223017Sdim // Prepare for overload resolution. Here we construct a synthetic argument 2781223017Sdim // if necessary and make sure that implicit functions are declared. 2782224145Sdim CanQualType CanTy = Context.getCanonicalType(Context.getTagDeclType(RD)); 2783223017Sdim DeclarationName Name; 2784276479Sdim Expr *Arg = nullptr; 2785223017Sdim unsigned NumArgs; 2786223017Sdim 2787235864Sdim QualType ArgType = CanTy; 2788235864Sdim ExprValueKind VK = VK_LValue; 2789235864Sdim 2790223017Sdim if (SM == CXXDefaultConstructor) { 2791223017Sdim Name = Context.DeclarationNames.getCXXConstructorName(CanTy); 2792223017Sdim NumArgs = 0; 2793224145Sdim if (RD->needsImplicitDefaultConstructor()) 2794224145Sdim DeclareImplicitDefaultConstructor(RD); 2795223017Sdim } else { 2796223017Sdim if (SM == CXXCopyConstructor || SM == CXXMoveConstructor) { 2797223017Sdim Name = Context.DeclarationNames.getCXXConstructorName(CanTy); 2798249423Sdim if (RD->needsImplicitCopyConstructor()) 2799224145Sdim DeclareImplicitCopyConstructor(RD); 2800249423Sdim if (getLangOpts().CPlusPlus11 && RD->needsImplicitMoveConstructor()) 2801226633Sdim DeclareImplicitMoveConstructor(RD); 2802223017Sdim } else { 2803223017Sdim Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2804249423Sdim if (RD->needsImplicitCopyAssignment()) 2805224145Sdim DeclareImplicitCopyAssignment(RD); 2806249423Sdim if (getLangOpts().CPlusPlus11 && RD->needsImplicitMoveAssignment()) 2807226633Sdim DeclareImplicitMoveAssignment(RD); 2808223017Sdim } 2809223017Sdim 2810223017Sdim if (ConstArg) 2811223017Sdim ArgType.addConst(); 2812223017Sdim if (VolatileArg) 2813223017Sdim ArgType.addVolatile(); 2814223017Sdim 2815223017Sdim // This isn't /really/ specified by the standard, but it's implied 2816223017Sdim // we should be working from an RValue in the case of move to ensure 2817223017Sdim // that we prefer to bind to rvalue references, and an LValue in the 2818223017Sdim // case of copy to ensure we don't bind to rvalue references. 2819223017Sdim // Possibly an XValue is actually correct in the case of move, but 2820223017Sdim // there is no semantic difference for class types in this restricted 2821223017Sdim // case. 2822224145Sdim if (SM == CXXCopyConstructor || SM == CXXCopyAssignment) 2823223017Sdim VK = VK_LValue; 2824223017Sdim else 2825223017Sdim VK = VK_RValue; 2826235864Sdim } 2827223017Sdim 2828235864Sdim OpaqueValueExpr FakeArg(SourceLocation(), ArgType, VK); 2829235864Sdim 2830235864Sdim if (SM != CXXDefaultConstructor) { 2831223017Sdim NumArgs = 1; 2832235864Sdim Arg = &FakeArg; 2833223017Sdim } 2834223017Sdim 2835223017Sdim // Create the object argument 2836223017Sdim QualType ThisTy = CanTy; 2837223017Sdim if (ConstThis) 2838223017Sdim ThisTy.addConst(); 2839223017Sdim if (VolatileThis) 2840223017Sdim ThisTy.addVolatile(); 2841224145Sdim Expr::Classification Classification = 2842235864Sdim OpaqueValueExpr(SourceLocation(), ThisTy, 2843235864Sdim RValueThis ? VK_RValue : VK_LValue).Classify(Context); 2844223017Sdim 2845223017Sdim // Now we perform lookup on the name we computed earlier and do overload 2846223017Sdim // resolution. Lookup is only performed directly into the class since there 2847223017Sdim // will always be a (possibly implicit) declaration to shadow any others. 2848276479Sdim OverloadCandidateSet OCS(RD->getLocation(), OverloadCandidateSet::CSK_Normal); 2849249423Sdim DeclContext::lookup_result R = RD->lookup(Name); 2850224145Sdim 2851280031Sdim if (R.empty()) { 2852280031Sdim // We might have no default constructor because we have a lambda's closure 2853280031Sdim // type, rather than because there's some other declared constructor. 2854280031Sdim // Every class has a copy/move constructor, copy/move assignment, and 2855280031Sdim // destructor. 2856280031Sdim assert(SM == CXXDefaultConstructor && 2857280031Sdim "lookup for a constructor or assignment operator was empty"); 2858280031Sdim Result->setMethod(nullptr); 2859280031Sdim Result->setKind(SpecialMemberOverloadResult::NoMemberOrDeleted); 2860280031Sdim return Result; 2861280031Sdim } 2862280031Sdim 2863261991Sdim // Copy the candidates as our processing of them may load new declarations 2864261991Sdim // from an external source and invalidate lookup_result. 2865261991Sdim SmallVector<NamedDecl *, 8> Candidates(R.begin(), R.end()); 2866261991Sdim 2867276479Sdim for (auto *Cand : Candidates) { 2868224145Sdim if (Cand->isInvalidDecl()) 2869223017Sdim continue; 2870223017Sdim 2871224145Sdim if (UsingShadowDecl *U = dyn_cast<UsingShadowDecl>(Cand)) { 2872224145Sdim // FIXME: [namespace.udecl]p15 says that we should only consider a 2873224145Sdim // using declaration here if it does not match a declaration in the 2874224145Sdim // derived class. We do not implement this correctly in other cases 2875224145Sdim // either. 2876224145Sdim Cand = U->getTargetDecl(); 2877223017Sdim 2878224145Sdim if (Cand->isInvalidDecl()) 2879224145Sdim continue; 2880224145Sdim } 2881224145Sdim 2882224145Sdim if (CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(Cand)) { 2883224145Sdim if (SM == CXXCopyAssignment || SM == CXXMoveAssignment) 2884224145Sdim AddMethodCandidate(M, DeclAccessPair::make(M, AS_public), RD, ThisTy, 2885234353Sdim Classification, llvm::makeArrayRef(&Arg, NumArgs), 2886234353Sdim OCS, true); 2887224145Sdim else 2888234353Sdim AddOverloadCandidate(M, DeclAccessPair::make(M, AS_public), 2889234353Sdim llvm::makeArrayRef(&Arg, NumArgs), OCS, true); 2890224145Sdim } else if (FunctionTemplateDecl *Tmpl = 2891224145Sdim dyn_cast<FunctionTemplateDecl>(Cand)) { 2892224145Sdim if (SM == CXXCopyAssignment || SM == CXXMoveAssignment) 2893224145Sdim AddMethodTemplateCandidate(Tmpl, DeclAccessPair::make(Tmpl, AS_public), 2894276479Sdim RD, nullptr, ThisTy, Classification, 2895234353Sdim llvm::makeArrayRef(&Arg, NumArgs), 2896224145Sdim OCS, true); 2897224145Sdim else 2898224145Sdim AddTemplateOverloadCandidate(Tmpl, DeclAccessPair::make(Tmpl, AS_public), 2899276479Sdim nullptr, llvm::makeArrayRef(&Arg, NumArgs), 2900234353Sdim OCS, true); 2901223017Sdim } else { 2902224145Sdim assert(isa<UsingDecl>(Cand) && "illegal Kind of operator = Decl"); 2903223017Sdim } 2904223017Sdim } 2905223017Sdim 2906223017Sdim OverloadCandidateSet::iterator Best; 2907223017Sdim switch (OCS.BestViableFunction(*this, SourceLocation(), Best)) { 2908223017Sdim case OR_Success: 2909223017Sdim Result->setMethod(cast<CXXMethodDecl>(Best->Function)); 2910235864Sdim Result->setKind(SpecialMemberOverloadResult::Success); 2911223017Sdim break; 2912223017Sdim 2913223017Sdim case OR_Deleted: 2914223017Sdim Result->setMethod(cast<CXXMethodDecl>(Best->Function)); 2915234353Sdim Result->setKind(SpecialMemberOverloadResult::NoMemberOrDeleted); 2916223017Sdim break; 2917223017Sdim 2918223017Sdim case OR_Ambiguous: 2919276479Sdim Result->setMethod(nullptr); 2920234353Sdim Result->setKind(SpecialMemberOverloadResult::Ambiguous); 2921234353Sdim break; 2922234353Sdim 2923223017Sdim case OR_No_Viable_Function: 2924276479Sdim Result->setMethod(nullptr); 2925234353Sdim Result->setKind(SpecialMemberOverloadResult::NoMemberOrDeleted); 2926223017Sdim break; 2927223017Sdim } 2928223017Sdim 2929223017Sdim return Result; 2930223017Sdim} 2931223017Sdim 2932223017Sdim/// \brief Look up the default constructor for the given class. 2933223017SdimCXXConstructorDecl *Sema::LookupDefaultConstructor(CXXRecordDecl *Class) { 2934223017Sdim SpecialMemberOverloadResult *Result = 2935223017Sdim LookupSpecialMember(Class, CXXDefaultConstructor, false, false, false, 2936223017Sdim false, false); 2937223017Sdim 2938223017Sdim return cast_or_null<CXXConstructorDecl>(Result->getMethod()); 2939223017Sdim} 2940223017Sdim 2941224145Sdim/// \brief Look up the copying constructor for the given class. 2942224145SdimCXXConstructorDecl *Sema::LookupCopyingConstructor(CXXRecordDecl *Class, 2943235864Sdim unsigned Quals) { 2944223017Sdim assert(!(Quals & ~(Qualifiers::Const | Qualifiers::Volatile)) && 2945223017Sdim "non-const, non-volatile qualifiers for copy ctor arg"); 2946223017Sdim SpecialMemberOverloadResult *Result = 2947223017Sdim LookupSpecialMember(Class, CXXCopyConstructor, Quals & Qualifiers::Const, 2948223017Sdim Quals & Qualifiers::Volatile, false, false, false); 2949223017Sdim 2950223017Sdim return cast_or_null<CXXConstructorDecl>(Result->getMethod()); 2951223017Sdim} 2952223017Sdim 2953226633Sdim/// \brief Look up the moving constructor for the given class. 2954239462SdimCXXConstructorDecl *Sema::LookupMovingConstructor(CXXRecordDecl *Class, 2955239462Sdim unsigned Quals) { 2956226633Sdim SpecialMemberOverloadResult *Result = 2957239462Sdim LookupSpecialMember(Class, CXXMoveConstructor, Quals & Qualifiers::Const, 2958239462Sdim Quals & Qualifiers::Volatile, false, false, false); 2959226633Sdim 2960226633Sdim return cast_or_null<CXXConstructorDecl>(Result->getMethod()); 2961226633Sdim} 2962226633Sdim 2963210299Sed/// \brief Look up the constructors for the given class. 2964210299SedDeclContext::lookup_result Sema::LookupConstructors(CXXRecordDecl *Class) { 2965223017Sdim // If the implicit constructors have not yet been declared, do so now. 2966249423Sdim if (CanDeclareSpecialMemberFunction(Class)) { 2967223017Sdim if (Class->needsImplicitDefaultConstructor()) 2968210299Sed DeclareImplicitDefaultConstructor(Class); 2969249423Sdim if (Class->needsImplicitCopyConstructor()) 2970210299Sed DeclareImplicitCopyConstructor(Class); 2971249423Sdim if (getLangOpts().CPlusPlus11 && Class->needsImplicitMoveConstructor()) 2972226633Sdim DeclareImplicitMoveConstructor(Class); 2973210299Sed } 2974218893Sdim 2975210299Sed CanQualType T = Context.getCanonicalType(Context.getTypeDeclType(Class)); 2976210299Sed DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(T); 2977210299Sed return Class->lookup(Name); 2978210299Sed} 2979210299Sed 2980224145Sdim/// \brief Look up the copying assignment operator for the given class. 2981224145SdimCXXMethodDecl *Sema::LookupCopyingAssignment(CXXRecordDecl *Class, 2982224145Sdim unsigned Quals, bool RValueThis, 2983235864Sdim unsigned ThisQuals) { 2984224145Sdim assert(!(Quals & ~(Qualifiers::Const | Qualifiers::Volatile)) && 2985224145Sdim "non-const, non-volatile qualifiers for copy assignment arg"); 2986224145Sdim assert(!(ThisQuals & ~(Qualifiers::Const | Qualifiers::Volatile)) && 2987224145Sdim "non-const, non-volatile qualifiers for copy assignment this"); 2988224145Sdim SpecialMemberOverloadResult *Result = 2989224145Sdim LookupSpecialMember(Class, CXXCopyAssignment, Quals & Qualifiers::Const, 2990224145Sdim Quals & Qualifiers::Volatile, RValueThis, 2991224145Sdim ThisQuals & Qualifiers::Const, 2992224145Sdim ThisQuals & Qualifiers::Volatile); 2993224145Sdim 2994224145Sdim return Result->getMethod(); 2995224145Sdim} 2996224145Sdim 2997226633Sdim/// \brief Look up the moving assignment operator for the given class. 2998226633SdimCXXMethodDecl *Sema::LookupMovingAssignment(CXXRecordDecl *Class, 2999239462Sdim unsigned Quals, 3000226633Sdim bool RValueThis, 3001226633Sdim unsigned ThisQuals) { 3002226633Sdim assert(!(ThisQuals & ~(Qualifiers::Const | Qualifiers::Volatile)) && 3003226633Sdim "non-const, non-volatile qualifiers for copy assignment this"); 3004226633Sdim SpecialMemberOverloadResult *Result = 3005239462Sdim LookupSpecialMember(Class, CXXMoveAssignment, Quals & Qualifiers::Const, 3006239462Sdim Quals & Qualifiers::Volatile, RValueThis, 3007226633Sdim ThisQuals & Qualifiers::Const, 3008226633Sdim ThisQuals & Qualifiers::Volatile); 3009226633Sdim 3010226633Sdim return Result->getMethod(); 3011226633Sdim} 3012226633Sdim 3013210299Sed/// \brief Look for the destructor of the given class. 3014210299Sed/// 3015218893Sdim/// During semantic analysis, this routine should be used in lieu of 3016210299Sed/// CXXRecordDecl::getDestructor(). 3017210299Sed/// 3018210299Sed/// \returns The destructor for this class. 3019210299SedCXXDestructorDecl *Sema::LookupDestructor(CXXRecordDecl *Class) { 3020223017Sdim return cast<CXXDestructorDecl>(LookupSpecialMember(Class, CXXDestructor, 3021223017Sdim false, false, false, 3022223017Sdim false, false)->getMethod()); 3023210299Sed} 3024210299Sed 3025234353Sdim/// LookupLiteralOperator - Determine which literal operator should be used for 3026234353Sdim/// a user-defined literal, per C++11 [lex.ext]. 3027234353Sdim/// 3028234353Sdim/// Normal overload resolution is not used to select which literal operator to 3029234353Sdim/// call for a user-defined literal. Look up the provided literal operator name, 3030234353Sdim/// and filter the results to the appropriate set for the given argument types. 3031234353SdimSema::LiteralOperatorLookupResult 3032234353SdimSema::LookupLiteralOperator(Scope *S, LookupResult &R, 3033234353Sdim ArrayRef<QualType> ArgTys, 3034261991Sdim bool AllowRaw, bool AllowTemplate, 3035261991Sdim bool AllowStringTemplate) { 3036234353Sdim LookupName(R, S); 3037234353Sdim assert(R.getResultKind() != LookupResult::Ambiguous && 3038234353Sdim "literal operator lookup can't be ambiguous"); 3039234353Sdim 3040234353Sdim // Filter the lookup results appropriately. 3041234353Sdim LookupResult::Filter F = R.makeFilter(); 3042234353Sdim 3043261991Sdim bool FoundRaw = false; 3044234353Sdim bool FoundTemplate = false; 3045261991Sdim bool FoundStringTemplate = false; 3046234353Sdim bool FoundExactMatch = false; 3047234353Sdim 3048234353Sdim while (F.hasNext()) { 3049234353Sdim Decl *D = F.next(); 3050234353Sdim if (UsingShadowDecl *USD = dyn_cast<UsingShadowDecl>(D)) 3051234353Sdim D = USD->getTargetDecl(); 3052234353Sdim 3053251662Sdim // If the declaration we found is invalid, skip it. 3054251662Sdim if (D->isInvalidDecl()) { 3055251662Sdim F.erase(); 3056251662Sdim continue; 3057251662Sdim } 3058251662Sdim 3059261991Sdim bool IsRaw = false; 3060261991Sdim bool IsTemplate = false; 3061261991Sdim bool IsStringTemplate = false; 3062261991Sdim bool IsExactMatch = false; 3063261991Sdim 3064234353Sdim if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 3065234353Sdim if (FD->getNumParams() == 1 && 3066234353Sdim FD->getParamDecl(0)->getType()->getAs<PointerType>()) 3067234353Sdim IsRaw = true; 3068249423Sdim else if (FD->getNumParams() == ArgTys.size()) { 3069234353Sdim IsExactMatch = true; 3070234353Sdim for (unsigned ArgIdx = 0; ArgIdx != ArgTys.size(); ++ArgIdx) { 3071234353Sdim QualType ParamTy = FD->getParamDecl(ArgIdx)->getType(); 3072234353Sdim if (!Context.hasSameUnqualifiedType(ArgTys[ArgIdx], ParamTy)) { 3073234353Sdim IsExactMatch = false; 3074234353Sdim break; 3075234353Sdim } 3076234353Sdim } 3077234353Sdim } 3078234353Sdim } 3079261991Sdim if (FunctionTemplateDecl *FD = dyn_cast<FunctionTemplateDecl>(D)) { 3080261991Sdim TemplateParameterList *Params = FD->getTemplateParameters(); 3081261991Sdim if (Params->size() == 1) 3082261991Sdim IsTemplate = true; 3083261991Sdim else 3084261991Sdim IsStringTemplate = true; 3085261991Sdim } 3086234353Sdim 3087234353Sdim if (IsExactMatch) { 3088234353Sdim FoundExactMatch = true; 3089261991Sdim AllowRaw = false; 3090261991Sdim AllowTemplate = false; 3091261991Sdim AllowStringTemplate = false; 3092261991Sdim if (FoundRaw || FoundTemplate || FoundStringTemplate) { 3093234353Sdim // Go through again and remove the raw and template decls we've 3094234353Sdim // already found. 3095234353Sdim F.restart(); 3096261991Sdim FoundRaw = FoundTemplate = FoundStringTemplate = false; 3097234353Sdim } 3098261991Sdim } else if (AllowRaw && IsRaw) { 3099261991Sdim FoundRaw = true; 3100261991Sdim } else if (AllowTemplate && IsTemplate) { 3101261991Sdim FoundTemplate = true; 3102261991Sdim } else if (AllowStringTemplate && IsStringTemplate) { 3103261991Sdim FoundStringTemplate = true; 3104234353Sdim } else { 3105234353Sdim F.erase(); 3106234353Sdim } 3107234353Sdim } 3108234353Sdim 3109234353Sdim F.done(); 3110234353Sdim 3111234353Sdim // C++11 [lex.ext]p3, p4: If S contains a literal operator with a matching 3112234353Sdim // parameter type, that is used in preference to a raw literal operator 3113234353Sdim // or literal operator template. 3114234353Sdim if (FoundExactMatch) 3115234353Sdim return LOLR_Cooked; 3116234353Sdim 3117234353Sdim // C++11 [lex.ext]p3, p4: S shall contain a raw literal operator or a literal 3118234353Sdim // operator template, but not both. 3119234353Sdim if (FoundRaw && FoundTemplate) { 3120234353Sdim Diag(R.getNameLoc(), diag::err_ovl_ambiguous_call) << R.getLookupName(); 3121276479Sdim for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3122276479Sdim NoteOverloadCandidate((*I)->getUnderlyingDecl()->getAsFunction()); 3123234353Sdim return LOLR_Error; 3124234353Sdim } 3125234353Sdim 3126234353Sdim if (FoundRaw) 3127234353Sdim return LOLR_Raw; 3128234353Sdim 3129234353Sdim if (FoundTemplate) 3130234353Sdim return LOLR_Template; 3131234353Sdim 3132261991Sdim if (FoundStringTemplate) 3133261991Sdim return LOLR_StringTemplate; 3134261991Sdim 3135234353Sdim // Didn't find anything we could use. 3136234353Sdim Diag(R.getNameLoc(), diag::err_ovl_no_viable_literal_operator) 3137234353Sdim << R.getLookupName() << (int)ArgTys.size() << ArgTys[0] 3138261991Sdim << (ArgTys.size() == 2 ? ArgTys[1] : QualType()) << AllowRaw 3139261991Sdim << (AllowTemplate || AllowStringTemplate); 3140234353Sdim return LOLR_Error; 3141234353Sdim} 3142234353Sdim 3143203955Srdivackyvoid ADLResult::insert(NamedDecl *New) { 3144203955Srdivacky NamedDecl *&Old = Decls[cast<NamedDecl>(New->getCanonicalDecl())]; 3145203955Srdivacky 3146203955Srdivacky // If we haven't yet seen a decl for this key, or the last decl 3147203955Srdivacky // was exactly this one, we're done. 3148276479Sdim if (Old == nullptr || Old == New) { 3149203955Srdivacky Old = New; 3150203955Srdivacky return; 3151203955Srdivacky } 3152203955Srdivacky 3153203955Srdivacky // Otherwise, decide which is a more recent redeclaration. 3154276479Sdim FunctionDecl *OldFD = Old->getAsFunction(); 3155276479Sdim FunctionDecl *NewFD = New->getAsFunction(); 3156203955Srdivacky 3157203955Srdivacky FunctionDecl *Cursor = NewFD; 3158203955Srdivacky while (true) { 3159234353Sdim Cursor = Cursor->getPreviousDecl(); 3160203955Srdivacky 3161203955Srdivacky // If we got to the end without finding OldFD, OldFD is the newer 3162203955Srdivacky // declaration; leave things as they are. 3163203955Srdivacky if (!Cursor) return; 3164203955Srdivacky 3165203955Srdivacky // If we do find OldFD, then NewFD is newer. 3166203955Srdivacky if (Cursor == OldFD) break; 3167203955Srdivacky 3168203955Srdivacky // Otherwise, keep looking. 3169203955Srdivacky } 3170203955Srdivacky 3171203955Srdivacky Old = New; 3172198092Srdivacky} 3173198092Srdivacky 3174276479Sdimvoid Sema::ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc, 3175276479Sdim ArrayRef<Expr *> Args, ADLResult &Result) { 3176193326Sed // Find all of the associated namespaces and classes based on the 3177193326Sed // arguments we have. 3178193326Sed AssociatedNamespaceSet AssociatedNamespaces; 3179193326Sed AssociatedClassSet AssociatedClasses; 3180243830Sdim FindAssociatedClassesAndNamespaces(Loc, Args, 3181198092Srdivacky AssociatedNamespaces, 3182198092Srdivacky AssociatedClasses); 3183193326Sed 3184193326Sed // C++ [basic.lookup.argdep]p3: 3185193326Sed // Let X be the lookup set produced by unqualified lookup (3.4.1) 3186193326Sed // and let Y be the lookup set produced by argument dependent 3187193326Sed // lookup (defined as follows). If X contains [...] then Y is 3188193326Sed // empty. Otherwise Y is the set of declarations found in the 3189193326Sed // namespaces associated with the argument types as described 3190193326Sed // below. The set of declarations found by the lookup of the name 3191193326Sed // is the union of X and Y. 3192193326Sed // 3193193326Sed // Here, we compute Y and add its members to the overloaded 3194193326Sed // candidate set. 3195276479Sdim for (auto *NS : AssociatedNamespaces) { 3196193326Sed // When considering an associated namespace, the lookup is the 3197193326Sed // same as the lookup performed when the associated namespace is 3198193326Sed // used as a qualifier (3.4.3.2) except that: 3199193326Sed // 3200193326Sed // -- Any using-directives in the associated namespace are 3201193326Sed // ignored. 3202193326Sed // 3203198092Srdivacky // -- Any namespace-scope friend functions declared in 3204193326Sed // associated classes are visible within their respective 3205193326Sed // namespaces even if they are not visible during an ordinary 3206193326Sed // lookup (11.4). 3207276479Sdim DeclContext::lookup_result R = NS->lookup(Name); 3208276479Sdim for (auto *D : R) { 3209198092Srdivacky // If the only declaration here is an ordinary friend, consider 3210198092Srdivacky // it only if it was declared in an associated classes. 3211261991Sdim if ((D->getIdentifierNamespace() & Decl::IDNS_Ordinary) == 0) { 3212261991Sdim // If it's neither ordinarily visible nor a friend, we can't find it. 3213261991Sdim if ((D->getIdentifierNamespace() & Decl::IDNS_OrdinaryFriend) == 0) 3214198092Srdivacky continue; 3215261991Sdim 3216261991Sdim bool DeclaredInAssociatedClass = false; 3217261991Sdim for (Decl *DI = D; DI; DI = DI->getPreviousDecl()) { 3218261991Sdim DeclContext *LexDC = DI->getLexicalDeclContext(); 3219261991Sdim if (isa<CXXRecordDecl>(LexDC) && 3220296417Sdim AssociatedClasses.count(cast<CXXRecordDecl>(LexDC)) && 3221296417Sdim isVisible(cast<NamedDecl>(DI))) { 3222261991Sdim DeclaredInAssociatedClass = true; 3223261991Sdim break; 3224261991Sdim } 3225261991Sdim } 3226261991Sdim if (!DeclaredInAssociatedClass) 3227261991Sdim continue; 3228198092Srdivacky } 3229198092Srdivacky 3230203955Srdivacky if (isa<UsingShadowDecl>(D)) 3231203955Srdivacky D = cast<UsingShadowDecl>(D)->getTargetDecl(); 3232203955Srdivacky 3233276479Sdim if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) 3234203955Srdivacky continue; 3235203955Srdivacky 3236288943Sdim if (!isVisible(D) && !(D = findAcceptableDecl(*this, D))) 3237288943Sdim continue; 3238288943Sdim 3239203955Srdivacky Result.insert(D); 3240193326Sed } 3241193326Sed } 3242193326Sed} 3243201361Srdivacky 3244201361Srdivacky//---------------------------------------------------------------------------- 3245201361Srdivacky// Search for all visible declarations. 3246201361Srdivacky//---------------------------------------------------------------------------- 3247201361SrdivackyVisibleDeclConsumer::~VisibleDeclConsumer() { } 3248201361Srdivacky 3249261991Sdimbool VisibleDeclConsumer::includeHiddenDecls() const { return false; } 3250261991Sdim 3251201361Srdivackynamespace { 3252201361Srdivacky 3253201361Srdivackyclass ShadowContextRAII; 3254201361Srdivacky 3255201361Srdivackyclass VisibleDeclsRecord { 3256201361Srdivackypublic: 3257201361Srdivacky /// \brief An entry in the shadow map, which is optimized to store a 3258201361Srdivacky /// single declaration (the common case) but can also store a list 3259201361Srdivacky /// of declarations. 3260226633Sdim typedef llvm::TinyPtrVector<NamedDecl*> ShadowMapEntry; 3261218893Sdim 3262201361Srdivackyprivate: 3263201361Srdivacky /// \brief A mapping from declaration names to the declarations that have 3264201361Srdivacky /// this name within a particular scope. 3265201361Srdivacky typedef llvm::DenseMap<DeclarationName, ShadowMapEntry> ShadowMap; 3266201361Srdivacky 3267201361Srdivacky /// \brief A list of shadow maps, which is used to model name hiding. 3268201361Srdivacky std::list<ShadowMap> ShadowMaps; 3269201361Srdivacky 3270201361Srdivacky /// \brief The declaration contexts we have already visited. 3271201361Srdivacky llvm::SmallPtrSet<DeclContext *, 8> VisitedContexts; 3272201361Srdivacky 3273201361Srdivacky friend class ShadowContextRAII; 3274201361Srdivacky 3275201361Srdivackypublic: 3276201361Srdivacky /// \brief Determine whether we have already visited this context 3277201361Srdivacky /// (and, if not, note that we are going to visit that context now). 3278201361Srdivacky bool visitedContext(DeclContext *Ctx) { 3279280031Sdim return !VisitedContexts.insert(Ctx).second; 3280201361Srdivacky } 3281201361Srdivacky 3282212904Sdim bool alreadyVisitedContext(DeclContext *Ctx) { 3283212904Sdim return VisitedContexts.count(Ctx); 3284212904Sdim } 3285212904Sdim 3286201361Srdivacky /// \brief Determine whether the given declaration is hidden in the 3287201361Srdivacky /// current scope. 3288201361Srdivacky /// 3289201361Srdivacky /// \returns the declaration that hides the given declaration, or 3290201361Srdivacky /// NULL if no such declaration exists. 3291201361Srdivacky NamedDecl *checkHidden(NamedDecl *ND); 3292201361Srdivacky 3293201361Srdivacky /// \brief Add a declaration to the current shadow map. 3294226633Sdim void add(NamedDecl *ND) { 3295226633Sdim ShadowMaps.back()[ND->getDeclName()].push_back(ND); 3296226633Sdim } 3297201361Srdivacky}; 3298201361Srdivacky 3299201361Srdivacky/// \brief RAII object that records when we've entered a shadow context. 3300201361Srdivackyclass ShadowContextRAII { 3301201361Srdivacky VisibleDeclsRecord &Visible; 3302201361Srdivacky 3303201361Srdivacky typedef VisibleDeclsRecord::ShadowMap ShadowMap; 3304201361Srdivacky 3305201361Srdivackypublic: 3306201361Srdivacky ShadowContextRAII(VisibleDeclsRecord &Visible) : Visible(Visible) { 3307288943Sdim Visible.ShadowMaps.emplace_back(); 3308201361Srdivacky } 3309201361Srdivacky 3310201361Srdivacky ~ShadowContextRAII() { 3311201361Srdivacky Visible.ShadowMaps.pop_back(); 3312201361Srdivacky } 3313201361Srdivacky}; 3314201361Srdivacky 3315201361Srdivacky} // end anonymous namespace 3316201361Srdivacky 3317201361SrdivackyNamedDecl *VisibleDeclsRecord::checkHidden(NamedDecl *ND) { 3318201361Srdivacky unsigned IDNS = ND->getIdentifierNamespace(); 3319201361Srdivacky std::list<ShadowMap>::reverse_iterator SM = ShadowMaps.rbegin(); 3320201361Srdivacky for (std::list<ShadowMap>::reverse_iterator SMEnd = ShadowMaps.rend(); 3321201361Srdivacky SM != SMEnd; ++SM) { 3322201361Srdivacky ShadowMap::iterator Pos = SM->find(ND->getDeclName()); 3323201361Srdivacky if (Pos == SM->end()) 3324201361Srdivacky continue; 3325201361Srdivacky 3326276479Sdim for (auto *D : Pos->second) { 3327201361Srdivacky // A tag declaration does not hide a non-tag declaration. 3328276479Sdim if (D->hasTagIdentifierNamespace() && 3329218893Sdim (IDNS & (Decl::IDNS_Member | Decl::IDNS_Ordinary | 3330201361Srdivacky Decl::IDNS_ObjCProtocol))) 3331201361Srdivacky continue; 3332201361Srdivacky 3333201361Srdivacky // Protocols are in distinct namespaces from everything else. 3334276479Sdim if (((D->getIdentifierNamespace() & Decl::IDNS_ObjCProtocol) 3335201361Srdivacky || (IDNS & Decl::IDNS_ObjCProtocol)) && 3336276479Sdim D->getIdentifierNamespace() != IDNS) 3337201361Srdivacky continue; 3338201361Srdivacky 3339202379Srdivacky // Functions and function templates in the same scope overload 3340202379Srdivacky // rather than hide. FIXME: Look for hiding based on function 3341202379Srdivacky // signatures! 3342276479Sdim if (D->getUnderlyingDecl()->isFunctionOrFunctionTemplate() && 3343276479Sdim ND->getUnderlyingDecl()->isFunctionOrFunctionTemplate() && 3344202379Srdivacky SM == ShadowMaps.rbegin()) 3345202379Srdivacky continue; 3346218893Sdim 3347201361Srdivacky // We've found a declaration that hides this one. 3348276479Sdim return D; 3349201361Srdivacky } 3350201361Srdivacky } 3351201361Srdivacky 3352276479Sdim return nullptr; 3353201361Srdivacky} 3354201361Srdivacky 3355201361Srdivackystatic void LookupVisibleDecls(DeclContext *Ctx, LookupResult &Result, 3356201361Srdivacky bool QualifiedNameLookup, 3357202379Srdivacky bool InBaseClass, 3358201361Srdivacky VisibleDeclConsumer &Consumer, 3359201361Srdivacky VisibleDeclsRecord &Visited) { 3360203955Srdivacky if (!Ctx) 3361203955Srdivacky return; 3362203955Srdivacky 3363201361Srdivacky // Make sure we don't visit the same context twice. 3364201361Srdivacky if (Visited.visitedContext(Ctx->getPrimaryContext())) 3365201361Srdivacky return; 3366218893Sdim 3367288943Sdim // Outside C++, lookup results for the TU live on identifiers. 3368288943Sdim if (isa<TranslationUnitDecl>(Ctx) && 3369288943Sdim !Result.getSema().getLangOpts().CPlusPlus) { 3370288943Sdim auto &S = Result.getSema(); 3371288943Sdim auto &Idents = S.Context.Idents; 3372288943Sdim 3373288943Sdim // Ensure all external identifiers are in the identifier table. 3374288943Sdim if (IdentifierInfoLookup *External = Idents.getExternalIdentifierLookup()) { 3375288943Sdim std::unique_ptr<IdentifierIterator> Iter(External->getIdentifiers()); 3376288943Sdim for (StringRef Name = Iter->Next(); !Name.empty(); Name = Iter->Next()) 3377288943Sdim Idents.get(Name); 3378288943Sdim } 3379288943Sdim 3380288943Sdim // Walk all lookup results in the TU for each identifier. 3381288943Sdim for (const auto &Ident : Idents) { 3382288943Sdim for (auto I = S.IdResolver.begin(Ident.getValue()), 3383288943Sdim E = S.IdResolver.end(); 3384288943Sdim I != E; ++I) { 3385288943Sdim if (S.IdResolver.isDeclInScope(*I, Ctx)) { 3386288943Sdim if (NamedDecl *ND = Result.getAcceptableDecl(*I)) { 3387288943Sdim Consumer.FoundDecl(ND, Visited.checkHidden(ND), Ctx, InBaseClass); 3388288943Sdim Visited.add(ND); 3389288943Sdim } 3390288943Sdim } 3391288943Sdim } 3392288943Sdim } 3393288943Sdim 3394288943Sdim return; 3395288943Sdim } 3396288943Sdim 3397210299Sed if (CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(Ctx)) 3398210299Sed Result.getSema().ForceDeclarationOfImplicitMembers(Class); 3399210299Sed 3400201361Srdivacky // Enumerate all of the results in this context. 3401288943Sdim for (DeclContextLookupResult R : Ctx->lookups()) { 3402288943Sdim for (auto *D : R) { 3403288943Sdim if (auto *ND = Result.getAcceptableDecl(D)) { 3404288943Sdim Consumer.FoundDecl(ND, Visited.checkHidden(ND), Ctx, InBaseClass); 3405288943Sdim Visited.add(ND); 3406218893Sdim } 3407201361Srdivacky } 3408201361Srdivacky } 3409201361Srdivacky 3410201361Srdivacky // Traverse using directives for qualified name lookup. 3411201361Srdivacky if (QualifiedNameLookup) { 3412201361Srdivacky ShadowContextRAII Shadow(Visited); 3413276479Sdim for (auto I : Ctx->using_directives()) { 3414276479Sdim LookupVisibleDecls(I->getNominatedNamespace(), Result, 3415202379Srdivacky QualifiedNameLookup, InBaseClass, Consumer, Visited); 3416201361Srdivacky } 3417201361Srdivacky } 3418201361Srdivacky 3419202379Srdivacky // Traverse the contexts of inherited C++ classes. 3420201361Srdivacky if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx)) { 3421203955Srdivacky if (!Record->hasDefinition()) 3422203955Srdivacky return; 3423203955Srdivacky 3424276479Sdim for (const auto &B : Record->bases()) { 3425276479Sdim QualType BaseType = B.getType(); 3426218893Sdim 3427201361Srdivacky // Don't look into dependent bases, because name lookup can't look 3428201361Srdivacky // there anyway. 3429201361Srdivacky if (BaseType->isDependentType()) 3430201361Srdivacky continue; 3431218893Sdim 3432201361Srdivacky const RecordType *Record = BaseType->getAs<RecordType>(); 3433201361Srdivacky if (!Record) 3434201361Srdivacky continue; 3435218893Sdim 3436201361Srdivacky // FIXME: It would be nice to be able to determine whether referencing 3437201361Srdivacky // a particular member would be ambiguous. For example, given 3438201361Srdivacky // 3439201361Srdivacky // struct A { int member; }; 3440201361Srdivacky // struct B { int member; }; 3441201361Srdivacky // struct C : A, B { }; 3442201361Srdivacky // 3443201361Srdivacky // void f(C *c) { c->### } 3444201361Srdivacky // 3445201361Srdivacky // accessing 'member' would result in an ambiguity. However, we 3446201361Srdivacky // could be smart enough to qualify the member with the base 3447201361Srdivacky // class, e.g., 3448201361Srdivacky // 3449201361Srdivacky // c->B::member 3450201361Srdivacky // 3451201361Srdivacky // or 3452201361Srdivacky // 3453201361Srdivacky // c->A::member 3454218893Sdim 3455201361Srdivacky // Find results in this base class (and its bases). 3456201361Srdivacky ShadowContextRAII Shadow(Visited); 3457201361Srdivacky LookupVisibleDecls(Record->getDecl(), Result, QualifiedNameLookup, 3458202379Srdivacky true, Consumer, Visited); 3459202379Srdivacky } 3460202379Srdivacky } 3461218893Sdim 3462202379Srdivacky // Traverse the contexts of Objective-C classes. 3463202379Srdivacky if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>(Ctx)) { 3464202379Srdivacky // Traverse categories. 3465276479Sdim for (auto *Cat : IFace->visible_categories()) { 3466202379Srdivacky ShadowContextRAII Shadow(Visited); 3467276479Sdim LookupVisibleDecls(Cat, Result, QualifiedNameLookup, false, 3468201361Srdivacky Consumer, Visited); 3469201361Srdivacky } 3470202379Srdivacky 3471202379Srdivacky // Traverse protocols. 3472276479Sdim for (auto *I : IFace->all_referenced_protocols()) { 3473202379Srdivacky ShadowContextRAII Shadow(Visited); 3474276479Sdim LookupVisibleDecls(I, Result, QualifiedNameLookup, false, Consumer, 3475202379Srdivacky Visited); 3476202379Srdivacky } 3477202379Srdivacky 3478202379Srdivacky // Traverse the superclass. 3479202379Srdivacky if (IFace->getSuperClass()) { 3480202379Srdivacky ShadowContextRAII Shadow(Visited); 3481202379Srdivacky LookupVisibleDecls(IFace->getSuperClass(), Result, QualifiedNameLookup, 3482202379Srdivacky true, Consumer, Visited); 3483202379Srdivacky } 3484218893Sdim 3485207619Srdivacky // If there is an implementation, traverse it. We do this to find 3486207619Srdivacky // synthesized ivars. 3487207619Srdivacky if (IFace->getImplementation()) { 3488207619Srdivacky ShadowContextRAII Shadow(Visited); 3489218893Sdim LookupVisibleDecls(IFace->getImplementation(), Result, 3490234353Sdim QualifiedNameLookup, InBaseClass, Consumer, Visited); 3491207619Srdivacky } 3492202379Srdivacky } else if (ObjCProtocolDecl *Protocol = dyn_cast<ObjCProtocolDecl>(Ctx)) { 3493276479Sdim for (auto *I : Protocol->protocols()) { 3494202379Srdivacky ShadowContextRAII Shadow(Visited); 3495276479Sdim LookupVisibleDecls(I, Result, QualifiedNameLookup, false, Consumer, 3496202379Srdivacky Visited); 3497202379Srdivacky } 3498202379Srdivacky } else if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(Ctx)) { 3499276479Sdim for (auto *I : Category->protocols()) { 3500202379Srdivacky ShadowContextRAII Shadow(Visited); 3501276479Sdim LookupVisibleDecls(I, Result, QualifiedNameLookup, false, Consumer, 3502202379Srdivacky Visited); 3503202379Srdivacky } 3504218893Sdim 3505207619Srdivacky // If there is an implementation, traverse it. 3506207619Srdivacky if (Category->getImplementation()) { 3507207619Srdivacky ShadowContextRAII Shadow(Visited); 3508218893Sdim LookupVisibleDecls(Category->getImplementation(), Result, 3509207619Srdivacky QualifiedNameLookup, true, Consumer, Visited); 3510218893Sdim } 3511201361Srdivacky } 3512201361Srdivacky} 3513201361Srdivacky 3514201361Srdivackystatic void LookupVisibleDecls(Scope *S, LookupResult &Result, 3515201361Srdivacky UnqualUsingDirectiveSet &UDirs, 3516201361Srdivacky VisibleDeclConsumer &Consumer, 3517201361Srdivacky VisibleDeclsRecord &Visited) { 3518201361Srdivacky if (!S) 3519201361Srdivacky return; 3520201361Srdivacky 3521218893Sdim if (!S->getEntity() || 3522218893Sdim (!S->getParent() && 3523261991Sdim !Visited.alreadyVisitedContext(S->getEntity())) || 3524261991Sdim (S->getEntity())->isFunctionOrMethod()) { 3525261991Sdim FindLocalExternScope FindLocals(Result); 3526202379Srdivacky // Walk through the declarations in this Scope. 3527276479Sdim for (auto *D : S->decls()) { 3528276479Sdim if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 3529234353Sdim if ((ND = Result.getAcceptableDecl(ND))) { 3530276479Sdim Consumer.FoundDecl(ND, Visited.checkHidden(ND), nullptr, false); 3531202379Srdivacky Visited.add(ND); 3532202379Srdivacky } 3533202379Srdivacky } 3534202379Srdivacky } 3535218893Sdim 3536205219Srdivacky // FIXME: C++ [temp.local]p8 3537276479Sdim DeclContext *Entity = nullptr; 3538202379Srdivacky if (S->getEntity()) { 3539201361Srdivacky // Look into this scope's declaration context, along with any of its 3540201361Srdivacky // parent lookup contexts (e.g., enclosing classes), up to the point 3541201361Srdivacky // where we hit the context stored in the next outer scope. 3542261991Sdim Entity = S->getEntity(); 3543205219Srdivacky DeclContext *OuterCtx = findOuterContext(S).first; // FIXME 3544218893Sdim 3545205219Srdivacky for (DeclContext *Ctx = Entity; Ctx && !Ctx->Equals(OuterCtx); 3546201361Srdivacky Ctx = Ctx->getLookupParent()) { 3547202379Srdivacky if (ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(Ctx)) { 3548202379Srdivacky if (Method->isInstanceMethod()) { 3549202379Srdivacky // For instance methods, look for ivars in the method's interface. 3550202379Srdivacky LookupResult IvarResult(Result.getSema(), Result.getLookupName(), 3551202379Srdivacky Result.getNameLoc(), Sema::LookupMemberName); 3552218893Sdim if (ObjCInterfaceDecl *IFace = Method->getClassInterface()) { 3553218893Sdim LookupVisibleDecls(IFace, IvarResult, /*QualifiedNameLookup=*/false, 3554261991Sdim /*InBaseClass=*/false, Consumer, Visited); 3555218893Sdim } 3556202379Srdivacky } 3557202379Srdivacky 3558202379Srdivacky // We've already performed all of the name lookup that we need 3559202379Srdivacky // to for Objective-C methods; the next context will be the 3560202379Srdivacky // outer scope. 3561202379Srdivacky break; 3562202379Srdivacky } 3563202379Srdivacky 3564201361Srdivacky if (Ctx->isFunctionOrMethod()) 3565201361Srdivacky continue; 3566218893Sdim 3567218893Sdim LookupVisibleDecls(Ctx, Result, /*QualifiedNameLookup=*/false, 3568202379Srdivacky /*InBaseClass=*/false, Consumer, Visited); 3569201361Srdivacky } 3570201361Srdivacky } else if (!S->getParent()) { 3571201361Srdivacky // Look into the translation unit scope. We walk through the translation 3572201361Srdivacky // unit's declaration context, because the Scope itself won't have all of 3573201361Srdivacky // the declarations if we loaded a precompiled header. 3574201361Srdivacky // FIXME: We would like the translation unit's Scope object to point to the 3575201361Srdivacky // translation unit, so we don't need this special "if" branch. However, 3576201361Srdivacky // doing so would force the normal C++ name-lookup code to look into the 3577218893Sdim // translation unit decl when the IdentifierInfo chains would suffice. 3578201361Srdivacky // Once we fix that problem (which is part of a more general "don't look 3579202379Srdivacky // in DeclContexts unless we have to" optimization), we can eliminate this. 3580201361Srdivacky Entity = Result.getSema().Context.getTranslationUnitDecl(); 3581218893Sdim LookupVisibleDecls(Entity, Result, /*QualifiedNameLookup=*/false, 3582202379Srdivacky /*InBaseClass=*/false, Consumer, Visited); 3583218893Sdim } 3584218893Sdim 3585201361Srdivacky if (Entity) { 3586201361Srdivacky // Lookup visible declarations in any namespaces found by using 3587201361Srdivacky // directives. 3588288943Sdim for (const UnqualUsingEntry &UUE : UDirs.getNamespacesFor(Entity)) 3589288943Sdim LookupVisibleDecls(const_cast<DeclContext *>(UUE.getNominatedNamespace()), 3590218893Sdim Result, /*QualifiedNameLookup=*/false, 3591202379Srdivacky /*InBaseClass=*/false, Consumer, Visited); 3592201361Srdivacky } 3593201361Srdivacky 3594201361Srdivacky // Lookup names in the parent scope. 3595201361Srdivacky ShadowContextRAII Shadow(Visited); 3596201361Srdivacky LookupVisibleDecls(S->getParent(), Result, UDirs, Consumer, Visited); 3597201361Srdivacky} 3598201361Srdivacky 3599201361Srdivackyvoid Sema::LookupVisibleDecls(Scope *S, LookupNameKind Kind, 3600212904Sdim VisibleDeclConsumer &Consumer, 3601212904Sdim bool IncludeGlobalScope) { 3602201361Srdivacky // Determine the set of using directives available during 3603201361Srdivacky // unqualified name lookup. 3604201361Srdivacky Scope *Initial = S; 3605201361Srdivacky UnqualUsingDirectiveSet UDirs; 3606234353Sdim if (getLangOpts().CPlusPlus) { 3607201361Srdivacky // Find the first namespace or translation-unit scope. 3608201361Srdivacky while (S && !isNamespaceOrTranslationUnitScope(S)) 3609201361Srdivacky S = S->getParent(); 3610201361Srdivacky 3611201361Srdivacky UDirs.visitScopeChain(Initial, S); 3612201361Srdivacky } 3613201361Srdivacky UDirs.done(); 3614201361Srdivacky 3615201361Srdivacky // Look for visible declarations. 3616201361Srdivacky LookupResult Result(*this, DeclarationName(), SourceLocation(), Kind); 3617261991Sdim Result.setAllowHidden(Consumer.includeHiddenDecls()); 3618201361Srdivacky VisibleDeclsRecord Visited; 3619212904Sdim if (!IncludeGlobalScope) 3620212904Sdim Visited.visitedContext(Context.getTranslationUnitDecl()); 3621201361Srdivacky ShadowContextRAII Shadow(Visited); 3622201361Srdivacky ::LookupVisibleDecls(Initial, Result, UDirs, Consumer, Visited); 3623201361Srdivacky} 3624201361Srdivacky 3625201361Srdivackyvoid Sema::LookupVisibleDecls(DeclContext *Ctx, LookupNameKind Kind, 3626212904Sdim VisibleDeclConsumer &Consumer, 3627212904Sdim bool IncludeGlobalScope) { 3628201361Srdivacky LookupResult Result(*this, DeclarationName(), SourceLocation(), Kind); 3629261991Sdim Result.setAllowHidden(Consumer.includeHiddenDecls()); 3630201361Srdivacky VisibleDeclsRecord Visited; 3631212904Sdim if (!IncludeGlobalScope) 3632212904Sdim Visited.visitedContext(Context.getTranslationUnitDecl()); 3633201361Srdivacky ShadowContextRAII Shadow(Visited); 3634218893Sdim ::LookupVisibleDecls(Ctx, Result, /*QualifiedNameLookup=*/true, 3635202379Srdivacky /*InBaseClass=*/false, Consumer, Visited); 3636201361Srdivacky} 3637201361Srdivacky 3638218893Sdim/// LookupOrCreateLabel - Do a name lookup of a label with the specified name. 3639221345Sdim/// If GnuLabelLoc is a valid source location, then this is a definition 3640221345Sdim/// of an __label__ label name, otherwise it is a normal label definition 3641221345Sdim/// or use. 3642218893SdimLabelDecl *Sema::LookupOrCreateLabel(IdentifierInfo *II, SourceLocation Loc, 3643221345Sdim SourceLocation GnuLabelLoc) { 3644218893Sdim // Do a lookup to see if we have a label with this name already. 3645276479Sdim NamedDecl *Res = nullptr; 3646221345Sdim 3647221345Sdim if (GnuLabelLoc.isValid()) { 3648221345Sdim // Local label definitions always shadow existing labels. 3649221345Sdim Res = LabelDecl::Create(Context, CurContext, Loc, II, GnuLabelLoc); 3650221345Sdim Scope *S = CurScope; 3651221345Sdim PushOnScopeChains(Res, S, true); 3652221345Sdim return cast<LabelDecl>(Res); 3653221345Sdim } 3654221345Sdim 3655221345Sdim // Not a GNU local label. 3656221345Sdim Res = LookupSingleName(CurScope, II, Loc, LookupLabel, NotForRedeclaration); 3657221345Sdim // If we found a label, check to see if it is in the same context as us. 3658221345Sdim // When in a Block, we don't want to reuse a label in an enclosing function. 3659218893Sdim if (Res && Res->getDeclContext() != CurContext) 3660276479Sdim Res = nullptr; 3661276479Sdim if (!Res) { 3662218893Sdim // If not forward referenced or defined already, create the backing decl. 3663218893Sdim Res = LabelDecl::Create(Context, CurContext, Loc, II); 3664221345Sdim Scope *S = CurScope->getFnParent(); 3665218893Sdim assert(S && "Not in a function?"); 3666218893Sdim PushOnScopeChains(Res, S, true); 3667218893Sdim } 3668218893Sdim return cast<LabelDecl>(Res); 3669218893Sdim} 3670218893Sdim 3671218893Sdim//===----------------------------------------------------------------------===// 3672201361Srdivacky// Typo correction 3673218893Sdim//===----------------------------------------------------------------------===// 3674201361Srdivacky 3675276479Sdimstatic bool isCandidateViable(CorrectionCandidateCallback &CCC, 3676276479Sdim TypoCorrection &Candidate) { 3677276479Sdim Candidate.setCallbackDistance(CCC.RankCandidate(Candidate)); 3678276479Sdim return Candidate.getEditDistance(false) != TypoCorrection::InvalidDistance; 3679276479Sdim} 3680276479Sdim 3681276479Sdimstatic void LookupPotentialTypoResult(Sema &SemaRef, 3682276479Sdim LookupResult &Res, 3683276479Sdim IdentifierInfo *Name, 3684276479Sdim Scope *S, CXXScopeSpec *SS, 3685276479Sdim DeclContext *MemberContext, 3686276479Sdim bool EnteringContext, 3687276479Sdim bool isObjCIvarLookup, 3688276479Sdim bool FindHidden); 3689276479Sdim 3690280031Sdim/// \brief Check whether the declarations found for a typo correction are 3691280031Sdim/// visible, and if none of them are, convert the correction to an 'import 3692280031Sdim/// a module' correction. 3693280031Sdimstatic void checkCorrectionVisibility(Sema &SemaRef, TypoCorrection &TC) { 3694280031Sdim if (TC.begin() == TC.end()) 3695280031Sdim return; 3696280031Sdim 3697280031Sdim TypoCorrection::decl_iterator DI = TC.begin(), DE = TC.end(); 3698280031Sdim 3699280031Sdim for (/**/; DI != DE; ++DI) 3700280031Sdim if (!LookupResult::isVisible(SemaRef, *DI)) 3701280031Sdim break; 3702280031Sdim // Nothing to do if all decls are visible. 3703280031Sdim if (DI == DE) 3704280031Sdim return; 3705280031Sdim 3706280031Sdim llvm::SmallVector<NamedDecl*, 4> NewDecls(TC.begin(), DI); 3707280031Sdim bool AnyVisibleDecls = !NewDecls.empty(); 3708280031Sdim 3709280031Sdim for (/**/; DI != DE; ++DI) { 3710280031Sdim NamedDecl *VisibleDecl = *DI; 3711280031Sdim if (!LookupResult::isVisible(SemaRef, *DI)) 3712280031Sdim VisibleDecl = findAcceptableDecl(SemaRef, *DI); 3713280031Sdim 3714280031Sdim if (VisibleDecl) { 3715280031Sdim if (!AnyVisibleDecls) { 3716280031Sdim // Found a visible decl, discard all hidden ones. 3717280031Sdim AnyVisibleDecls = true; 3718280031Sdim NewDecls.clear(); 3719280031Sdim } 3720280031Sdim NewDecls.push_back(VisibleDecl); 3721280031Sdim } else if (!AnyVisibleDecls && !(*DI)->isModulePrivate()) 3722280031Sdim NewDecls.push_back(*DI); 3723280031Sdim } 3724280031Sdim 3725280031Sdim if (NewDecls.empty()) 3726280031Sdim TC = TypoCorrection(); 3727280031Sdim else { 3728280031Sdim TC.setCorrectionDecls(NewDecls); 3729280031Sdim TC.setRequiresImport(!AnyVisibleDecls); 3730280031Sdim } 3731280031Sdim} 3732280031Sdim 3733276479Sdim// Fill the supplied vector with the IdentifierInfo pointers for each piece of 3734276479Sdim// the given NestedNameSpecifier (i.e. given a NestedNameSpecifier "foo::bar::", 3735276479Sdim// fill the vector with the IdentifierInfo pointers for "foo" and "bar"). 3736276479Sdimstatic void getNestedNameSpecifierIdentifiers( 3737276479Sdim NestedNameSpecifier *NNS, 3738276479Sdim SmallVectorImpl<const IdentifierInfo*> &Identifiers) { 3739276479Sdim if (NestedNameSpecifier *Prefix = NNS->getPrefix()) 3740276479Sdim getNestedNameSpecifierIdentifiers(Prefix, Identifiers); 3741276479Sdim else 3742276479Sdim Identifiers.clear(); 3743276479Sdim 3744276479Sdim const IdentifierInfo *II = nullptr; 3745276479Sdim 3746276479Sdim switch (NNS->getKind()) { 3747276479Sdim case NestedNameSpecifier::Identifier: 3748276479Sdim II = NNS->getAsIdentifier(); 3749276479Sdim break; 3750276479Sdim 3751276479Sdim case NestedNameSpecifier::Namespace: 3752276479Sdim if (NNS->getAsNamespace()->isAnonymousNamespace()) 3753276479Sdim return; 3754276479Sdim II = NNS->getAsNamespace()->getIdentifier(); 3755276479Sdim break; 3756276479Sdim 3757276479Sdim case NestedNameSpecifier::NamespaceAlias: 3758276479Sdim II = NNS->getAsNamespaceAlias()->getIdentifier(); 3759276479Sdim break; 3760276479Sdim 3761276479Sdim case NestedNameSpecifier::TypeSpecWithTemplate: 3762276479Sdim case NestedNameSpecifier::TypeSpec: 3763276479Sdim II = QualType(NNS->getAsType(), 0).getBaseTypeIdentifier(); 3764276479Sdim break; 3765276479Sdim 3766276479Sdim case NestedNameSpecifier::Global: 3767280031Sdim case NestedNameSpecifier::Super: 3768276479Sdim return; 3769276479Sdim } 3770276479Sdim 3771276479Sdim if (II) 3772276479Sdim Identifiers.push_back(II); 3773276479Sdim} 3774276479Sdim 3775218893Sdimvoid TypoCorrectionConsumer::FoundDecl(NamedDecl *ND, NamedDecl *Hiding, 3776226633Sdim DeclContext *Ctx, bool InBaseClass) { 3777201361Srdivacky // Don't consider hidden names for typo correction. 3778201361Srdivacky if (Hiding) 3779201361Srdivacky return; 3780218893Sdim 3781201361Srdivacky // Only consider entities with identifiers for names, ignoring 3782201361Srdivacky // special names (constructors, overloaded operators, selectors, 3783201361Srdivacky // etc.). 3784201361Srdivacky IdentifierInfo *Name = ND->getIdentifier(); 3785201361Srdivacky if (!Name) 3786201361Srdivacky return; 3787201361Srdivacky 3788261991Sdim // Only consider visible declarations and declarations from modules with 3789261991Sdim // names that exactly match. 3790276479Sdim if (!LookupResult::isVisible(SemaRef, ND) && Name != Typo && 3791261991Sdim !findAcceptableDecl(SemaRef, ND)) 3792261991Sdim return; 3793261991Sdim 3794218893Sdim FoundName(Name->getName()); 3795218893Sdim} 3796218893Sdim 3797226633Sdimvoid TypoCorrectionConsumer::FoundName(StringRef Name) { 3798261991Sdim // Compute the edit distance between the typo and the name of this 3799261991Sdim // entity, and add the identifier to the list of results. 3800276479Sdim addName(Name, nullptr); 3801261991Sdim} 3802261991Sdim 3803261991Sdimvoid TypoCorrectionConsumer::addKeywordResult(StringRef Keyword) { 3804261991Sdim // Compute the edit distance between the typo and this keyword, 3805261991Sdim // and add the keyword to the list of results. 3806276479Sdim addName(Keyword, nullptr, nullptr, true); 3807261991Sdim} 3808261991Sdim 3809261991Sdimvoid TypoCorrectionConsumer::addName(StringRef Name, NamedDecl *ND, 3810261991Sdim NestedNameSpecifier *NNS, bool isKeyword) { 3811218893Sdim // Use a simple length-based heuristic to determine the minimum possible 3812218893Sdim // edit distance. If the minimum isn't good enough, bail out early. 3813276479Sdim StringRef TypoStr = Typo->getName(); 3814276479Sdim unsigned MinED = abs((int)Name.size() - (int)TypoStr.size()); 3815276479Sdim if (MinED && TypoStr.size() / MinED < 3) 3816218893Sdim return; 3817218893Sdim 3818218893Sdim // Compute an upper bound on the allowable edit distance, so that the 3819218893Sdim // edit-distance algorithm can short-circuit. 3820276479Sdim unsigned UpperBound = (TypoStr.size() + 2) / 3 + 1; 3821276479Sdim unsigned ED = TypoStr.edit_distance(Name, true, UpperBound); 3822261991Sdim if (ED >= UpperBound) return; 3823218893Sdim 3824261991Sdim TypoCorrection TC(&SemaRef.Context.Idents.get(Name), ND, NNS, ED); 3825226633Sdim if (isKeyword) TC.makeKeyword(); 3826280031Sdim TC.setCorrectionRange(nullptr, Result.getLookupNameInfo()); 3827226633Sdim addCorrection(TC); 3828224145Sdim} 3829224145Sdim 3830280031Sdimstatic const unsigned MaxTypoDistanceResultSets = 5; 3831280031Sdim 3832224145Sdimvoid TypoCorrectionConsumer::addCorrection(TypoCorrection Correction) { 3833276479Sdim StringRef TypoStr = Typo->getName(); 3834226633Sdim StringRef Name = Correction.getCorrectionAsIdentifierInfo()->getName(); 3835276479Sdim 3836276479Sdim // For very short typos, ignore potential corrections that have a different 3837276479Sdim // base identifier from the typo or which have a normalized edit distance 3838276479Sdim // longer than the typo itself. 3839276479Sdim if (TypoStr.size() < 3 && 3840276479Sdim (Name != TypoStr || Correction.getEditDistance(true) > TypoStr.size())) 3841276479Sdim return; 3842276479Sdim 3843276479Sdim // If the correction is resolved but is not viable, ignore it. 3844280031Sdim if (Correction.isResolved()) { 3845280031Sdim checkCorrectionVisibility(SemaRef, Correction); 3846280031Sdim if (!Correction || !isCandidateViable(*CorrectionValidator, Correction)) 3847280031Sdim return; 3848280031Sdim } 3849276479Sdim 3850239462Sdim TypoResultList &CList = 3851239462Sdim CorrectionResults[Correction.getEditDistance(false)][Name]; 3852224145Sdim 3853239462Sdim if (!CList.empty() && !CList.back().isResolved()) 3854239462Sdim CList.pop_back(); 3855239462Sdim if (NamedDecl *NewND = Correction.getCorrectionDecl()) { 3856239462Sdim std::string CorrectionStr = Correction.getAsString(SemaRef.getLangOpts()); 3857239462Sdim for (TypoResultList::iterator RI = CList.begin(), RIEnd = CList.end(); 3858239462Sdim RI != RIEnd; ++RI) { 3859239462Sdim // If the Correction refers to a decl already in the result list, 3860239462Sdim // replace the existing result if the string representation of Correction 3861239462Sdim // comes before the current result alphabetically, then stop as there is 3862239462Sdim // nothing more to be done to add Correction to the candidate set. 3863239462Sdim if (RI->getCorrectionDecl() == NewND) { 3864239462Sdim if (CorrectionStr < RI->getAsString(SemaRef.getLangOpts())) 3865239462Sdim *RI = Correction; 3866239462Sdim return; 3867239462Sdim } 3868239462Sdim } 3869239462Sdim } 3870239462Sdim if (CList.empty() || Correction.isResolved()) 3871239462Sdim CList.push_back(Correction); 3872224145Sdim 3873239462Sdim while (CorrectionResults.size() > MaxTypoDistanceResultSets) 3874276479Sdim CorrectionResults.erase(std::prev(CorrectionResults.end())); 3875224145Sdim} 3876224145Sdim 3877276479Sdimvoid TypoCorrectionConsumer::addNamespaces( 3878276479Sdim const llvm::MapVector<NamespaceDecl *, bool> &KnownNamespaces) { 3879276479Sdim SearchNamespaces = true; 3880234353Sdim 3881276479Sdim for (auto KNPair : KnownNamespaces) 3882276479Sdim Namespaces.addNameSpecifier(KNPair.first); 3883234353Sdim 3884276479Sdim bool SSIsTemplate = false; 3885276479Sdim if (NestedNameSpecifier *NNS = 3886276479Sdim (SS && SS->isValid()) ? SS->getScopeRep() : nullptr) { 3887276479Sdim if (const Type *T = NNS->getAsType()) 3888276479Sdim SSIsTemplate = T->getTypeClass() == Type::TemplateSpecialization; 3889276479Sdim } 3890296417Sdim // Do not transform this into an iterator-based loop. The loop body can 3891296417Sdim // trigger the creation of further types (through lazy deserialization) and 3892296417Sdim // invalide iterators into this list. 3893296417Sdim auto &Types = SemaRef.getASTContext().getTypes(); 3894296417Sdim for (unsigned I = 0; I != Types.size(); ++I) { 3895296417Sdim const auto *TI = Types[I]; 3896276479Sdim if (CXXRecordDecl *CD = TI->getAsCXXRecordDecl()) { 3897276479Sdim CD = CD->getCanonicalDecl(); 3898276479Sdim if (!CD->isDependentType() && !CD->isAnonymousStructOrUnion() && 3899276479Sdim !CD->isUnion() && CD->getIdentifier() && 3900276479Sdim (SSIsTemplate || !isa<ClassTemplateSpecializationDecl>(CD)) && 3901276479Sdim (CD->isBeingDefined() || CD->isCompleteDefinition())) 3902276479Sdim Namespaces.addNameSpecifier(CD); 3903276479Sdim } 3904276479Sdim } 3905276479Sdim} 3906234353Sdim 3907280031Sdimconst TypoCorrection &TypoCorrectionConsumer::getNextCorrection() { 3908280031Sdim if (++CurrentTCIndex < ValidatedCorrections.size()) 3909280031Sdim return ValidatedCorrections[CurrentTCIndex]; 3910280031Sdim 3911280031Sdim CurrentTCIndex = ValidatedCorrections.size(); 3912276479Sdim while (!CorrectionResults.empty()) { 3913276479Sdim auto DI = CorrectionResults.begin(); 3914276479Sdim if (DI->second.empty()) { 3915276479Sdim CorrectionResults.erase(DI); 3916276479Sdim continue; 3917276479Sdim } 3918234353Sdim 3919276479Sdim auto RI = DI->second.begin(); 3920276479Sdim if (RI->second.empty()) { 3921276479Sdim DI->second.erase(RI); 3922276479Sdim performQualifiedLookups(); 3923276479Sdim continue; 3924276479Sdim } 3925276479Sdim 3926276479Sdim TypoCorrection TC = RI->second.pop_back_val(); 3927280031Sdim if (TC.isResolved() || TC.requiresImport() || resolveCorrection(TC)) { 3928280031Sdim ValidatedCorrections.push_back(TC); 3929280031Sdim return ValidatedCorrections[CurrentTCIndex]; 3930280031Sdim } 3931276479Sdim } 3932280031Sdim return ValidatedCorrections[0]; // The empty correction. 3933276479Sdim} 3934276479Sdim 3935276479Sdimbool TypoCorrectionConsumer::resolveCorrection(TypoCorrection &Candidate) { 3936276479Sdim IdentifierInfo *Name = Candidate.getCorrectionAsIdentifierInfo(); 3937276479Sdim DeclContext *TempMemberContext = MemberContext; 3938280031Sdim CXXScopeSpec *TempSS = SS.get(); 3939276479Sdimretry_lookup: 3940276479Sdim LookupPotentialTypoResult(SemaRef, Result, Name, S, TempSS, TempMemberContext, 3941276479Sdim EnteringContext, 3942280031Sdim CorrectionValidator->IsObjCIvarLookup, 3943276479Sdim Name == Typo && !Candidate.WillReplaceSpecifier()); 3944276479Sdim switch (Result.getResultKind()) { 3945276479Sdim case LookupResult::NotFound: 3946276479Sdim case LookupResult::NotFoundInCurrentInstantiation: 3947276479Sdim case LookupResult::FoundUnresolvedValue: 3948276479Sdim if (TempSS) { 3949276479Sdim // Immediately retry the lookup without the given CXXScopeSpec 3950276479Sdim TempSS = nullptr; 3951276479Sdim Candidate.WillReplaceSpecifier(true); 3952276479Sdim goto retry_lookup; 3953276479Sdim } 3954276479Sdim if (TempMemberContext) { 3955276479Sdim if (SS && !TempSS) 3956280031Sdim TempSS = SS.get(); 3957276479Sdim TempMemberContext = nullptr; 3958276479Sdim goto retry_lookup; 3959276479Sdim } 3960276479Sdim if (SearchNamespaces) 3961276479Sdim QualifiedResults.push_back(Candidate); 3962234353Sdim break; 3963234353Sdim 3964276479Sdim case LookupResult::Ambiguous: 3965276479Sdim // We don't deal with ambiguities. 3966234353Sdim break; 3967234353Sdim 3968276479Sdim case LookupResult::Found: 3969276479Sdim case LookupResult::FoundOverloaded: 3970276479Sdim // Store all of the Decls for overloaded symbols 3971276479Sdim for (auto *TRD : Result) 3972276479Sdim Candidate.addCorrectionDecl(TRD); 3973280031Sdim checkCorrectionVisibility(SemaRef, Candidate); 3974280031Sdim if (!isCandidateViable(*CorrectionValidator, Candidate)) { 3975276479Sdim if (SearchNamespaces) 3976276479Sdim QualifiedResults.push_back(Candidate); 3977276479Sdim break; 3978276479Sdim } 3979280031Sdim Candidate.setCorrectionRange(SS.get(), Result.getLookupNameInfo()); 3980276479Sdim return true; 3981234353Sdim } 3982276479Sdim return false; 3983234353Sdim} 3984234353Sdim 3985276479Sdimvoid TypoCorrectionConsumer::performQualifiedLookups() { 3986276479Sdim unsigned TypoLen = Typo->getName().size(); 3987276479Sdim for (auto QR : QualifiedResults) { 3988276479Sdim for (auto NSI : Namespaces) { 3989276479Sdim DeclContext *Ctx = NSI.DeclCtx; 3990276479Sdim const Type *NSType = NSI.NameSpecifier->getAsType(); 3991224145Sdim 3992276479Sdim // If the current NestedNameSpecifier refers to a class and the 3993276479Sdim // current correction candidate is the name of that class, then skip 3994276479Sdim // it as it is unlikely a qualified version of the class' constructor 3995276479Sdim // is an appropriate correction. 3996296417Sdim if (CXXRecordDecl *NSDecl = NSType ? NSType->getAsCXXRecordDecl() : 3997296417Sdim nullptr) { 3998276479Sdim if (NSDecl->getIdentifier() == QR.getCorrectionAsIdentifierInfo()) 3999276479Sdim continue; 4000276479Sdim } 4001224145Sdim 4002276479Sdim TypoCorrection TC(QR); 4003276479Sdim TC.ClearCorrectionDecls(); 4004276479Sdim TC.setCorrectionSpecifier(NSI.NameSpecifier); 4005276479Sdim TC.setQualifierDistance(NSI.EditDistance); 4006276479Sdim TC.setCallbackDistance(0); // Reset the callback distance 4007224145Sdim 4008276479Sdim // If the current correction candidate and namespace combination are 4009276479Sdim // too far away from the original typo based on the normalized edit 4010276479Sdim // distance, then skip performing a qualified name lookup. 4011276479Sdim unsigned TmpED = TC.getEditDistance(true); 4012276479Sdim if (QR.getCorrectionAsIdentifierInfo() != Typo && TmpED && 4013276479Sdim TypoLen / TmpED < 3) 4014276479Sdim continue; 4015224145Sdim 4016276479Sdim Result.clear(); 4017276479Sdim Result.setLookupName(QR.getCorrectionAsIdentifierInfo()); 4018276479Sdim if (!SemaRef.LookupQualifiedName(Result, Ctx)) 4019276479Sdim continue; 4020224145Sdim 4021276479Sdim // Any corrections added below will be validated in subsequent 4022276479Sdim // iterations of the main while() loop over the Consumer's contents. 4023276479Sdim switch (Result.getResultKind()) { 4024276479Sdim case LookupResult::Found: 4025276479Sdim case LookupResult::FoundOverloaded: { 4026276479Sdim if (SS && SS->isValid()) { 4027276479Sdim std::string NewQualified = TC.getAsString(SemaRef.getLangOpts()); 4028276479Sdim std::string OldQualified; 4029276479Sdim llvm::raw_string_ostream OldOStream(OldQualified); 4030276479Sdim SS->getScopeRep()->print(OldOStream, SemaRef.getPrintingPolicy()); 4031276479Sdim OldOStream << Typo->getName(); 4032276479Sdim // If correction candidate would be an identical written qualified 4033276479Sdim // identifer, then the existing CXXScopeSpec probably included a 4034276479Sdim // typedef that didn't get accounted for properly. 4035276479Sdim if (OldOStream.str() == NewQualified) 4036276479Sdim break; 4037276479Sdim } 4038276479Sdim for (LookupResult::iterator TRD = Result.begin(), TRDEnd = Result.end(); 4039276479Sdim TRD != TRDEnd; ++TRD) { 4040276479Sdim if (SemaRef.CheckMemberAccess(TC.getCorrectionRange().getBegin(), 4041276479Sdim NSType ? NSType->getAsCXXRecordDecl() 4042276479Sdim : nullptr, 4043276479Sdim TRD.getPair()) == Sema::AR_accessible) 4044276479Sdim TC.addCorrectionDecl(*TRD); 4045276479Sdim } 4046280031Sdim if (TC.isResolved()) { 4047280031Sdim TC.setCorrectionRange(SS.get(), Result.getLookupNameInfo()); 4048276479Sdim addCorrection(TC); 4049280031Sdim } 4050276479Sdim break; 4051276479Sdim } 4052276479Sdim case LookupResult::NotFound: 4053276479Sdim case LookupResult::NotFoundInCurrentInstantiation: 4054276479Sdim case LookupResult::Ambiguous: 4055276479Sdim case LookupResult::FoundUnresolvedValue: 4056276479Sdim break; 4057276479Sdim } 4058261991Sdim } 4059234353Sdim } 4060276479Sdim QualifiedResults.clear(); 4061276479Sdim} 4062224145Sdim 4063276479SdimTypoCorrectionConsumer::NamespaceSpecifierSet::NamespaceSpecifierSet( 4064276479Sdim ASTContext &Context, DeclContext *CurContext, CXXScopeSpec *CurScopeSpec) 4065288943Sdim : Context(Context), CurContextChain(buildContextChain(CurContext)) { 4066276479Sdim if (NestedNameSpecifier *NNS = 4067276479Sdim CurScopeSpec ? CurScopeSpec->getScopeRep() : nullptr) { 4068276479Sdim llvm::raw_string_ostream SpecifierOStream(CurNameSpecifier); 4069276479Sdim NNS->print(SpecifierOStream, Context.getPrintingPolicy()); 4070224145Sdim 4071276479Sdim getNestedNameSpecifierIdentifiers(NNS, CurNameSpecifierIdentifiers); 4072224145Sdim } 4073276479Sdim // Build the list of identifiers that would be used for an absolute 4074276479Sdim // (from the global context) NestedNameSpecifier referring to the current 4075276479Sdim // context. 4076276479Sdim for (DeclContextList::reverse_iterator C = CurContextChain.rbegin(), 4077276479Sdim CEnd = CurContextChain.rend(); 4078276479Sdim C != CEnd; ++C) { 4079276479Sdim if (NamespaceDecl *ND = dyn_cast_or_null<NamespaceDecl>(*C)) 4080276479Sdim CurContextIdentifiers.push_back(ND->getIdentifier()); 4081276479Sdim } 4082224145Sdim 4083276479Sdim // Add the global context as a NestedNameSpecifier 4084276479Sdim SpecifierInfo SI = {cast<DeclContext>(Context.getTranslationUnitDecl()), 4085276479Sdim NestedNameSpecifier::GlobalSpecifier(Context), 1}; 4086276479Sdim DistanceMap[1].push_back(SI); 4087224145Sdim} 4088224145Sdim 4089276479Sdimauto TypoCorrectionConsumer::NamespaceSpecifierSet::buildContextChain( 4090276479Sdim DeclContext *Start) -> DeclContextList { 4091251662Sdim assert(Start && "Building a context chain from a null context"); 4092224145Sdim DeclContextList Chain; 4093276479Sdim for (DeclContext *DC = Start->getPrimaryContext(); DC != nullptr; 4094224145Sdim DC = DC->getLookupParent()) { 4095224145Sdim NamespaceDecl *ND = dyn_cast_or_null<NamespaceDecl>(DC); 4096224145Sdim if (!DC->isInlineNamespace() && !DC->isTransparentContext() && 4097224145Sdim !(ND && ND->isAnonymousNamespace())) 4098224145Sdim Chain.push_back(DC->getPrimaryContext()); 4099224145Sdim } 4100224145Sdim return Chain; 4101224145Sdim} 4102224145Sdim 4103276479Sdimunsigned 4104276479SdimTypoCorrectionConsumer::NamespaceSpecifierSet::buildNestedNameSpecifier( 4105276479Sdim DeclContextList &DeclChain, NestedNameSpecifier *&NNS) { 4106261991Sdim unsigned NumSpecifiers = 0; 4107261991Sdim for (DeclContextList::reverse_iterator C = DeclChain.rbegin(), 4108261991Sdim CEnd = DeclChain.rend(); 4109261991Sdim C != CEnd; ++C) { 4110261991Sdim if (NamespaceDecl *ND = dyn_cast_or_null<NamespaceDecl>(*C)) { 4111261991Sdim NNS = NestedNameSpecifier::Create(Context, NNS, ND); 4112261991Sdim ++NumSpecifiers; 4113261991Sdim } else if (RecordDecl *RD = dyn_cast_or_null<RecordDecl>(*C)) { 4114261991Sdim NNS = NestedNameSpecifier::Create(Context, NNS, RD->isTemplateDecl(), 4115261991Sdim RD->getTypeForDecl()); 4116261991Sdim ++NumSpecifiers; 4117261991Sdim } 4118261991Sdim } 4119261991Sdim return NumSpecifiers; 4120261991Sdim} 4121261991Sdim 4122276479Sdimvoid TypoCorrectionConsumer::NamespaceSpecifierSet::addNameSpecifier( 4123276479Sdim DeclContext *Ctx) { 4124276479Sdim NestedNameSpecifier *NNS = nullptr; 4125224145Sdim unsigned NumSpecifiers = 0; 4126276479Sdim DeclContextList NamespaceDeclChain(buildContextChain(Ctx)); 4127234353Sdim DeclContextList FullNamespaceDeclChain(NamespaceDeclChain); 4128224145Sdim 4129234353Sdim // Eliminate common elements from the two DeclContext chains. 4130224145Sdim for (DeclContextList::reverse_iterator C = CurContextChain.rbegin(), 4131224145Sdim CEnd = CurContextChain.rend(); 4132224145Sdim C != CEnd && !NamespaceDeclChain.empty() && 4133224145Sdim NamespaceDeclChain.back() == *C; ++C) { 4134224145Sdim NamespaceDeclChain.pop_back(); 4135224145Sdim } 4136224145Sdim 4137261991Sdim // Build the NestedNameSpecifier from what is left of the NamespaceDeclChain 4138276479Sdim NumSpecifiers = buildNestedNameSpecifier(NamespaceDeclChain, NNS); 4139261991Sdim 4140234353Sdim // Add an explicit leading '::' specifier if needed. 4141261991Sdim if (NamespaceDeclChain.empty()) { 4142261991Sdim // Rebuild the NestedNameSpecifier as a globally-qualified specifier. 4143261991Sdim NNS = NestedNameSpecifier::GlobalSpecifier(Context); 4144261991Sdim NumSpecifiers = 4145276479Sdim buildNestedNameSpecifier(FullNamespaceDeclChain, NNS); 4146261991Sdim } else if (NamedDecl *ND = 4147261991Sdim dyn_cast_or_null<NamedDecl>(NamespaceDeclChain.back())) { 4148234353Sdim IdentifierInfo *Name = ND->getIdentifier(); 4149261991Sdim bool SameNameSpecifier = false; 4150261991Sdim if (std::find(CurNameSpecifierIdentifiers.begin(), 4151234353Sdim CurNameSpecifierIdentifiers.end(), 4152234353Sdim Name) != CurNameSpecifierIdentifiers.end()) { 4153261991Sdim std::string NewNameSpecifier; 4154261991Sdim llvm::raw_string_ostream SpecifierOStream(NewNameSpecifier); 4155261991Sdim SmallVector<const IdentifierInfo *, 4> NewNameSpecifierIdentifiers; 4156261991Sdim getNestedNameSpecifierIdentifiers(NNS, NewNameSpecifierIdentifiers); 4157261991Sdim NNS->print(SpecifierOStream, Context.getPrintingPolicy()); 4158261991Sdim SpecifierOStream.flush(); 4159261991Sdim SameNameSpecifier = NewNameSpecifier == CurNameSpecifier; 4160261991Sdim } 4161261991Sdim if (SameNameSpecifier || 4162261991Sdim std::find(CurContextIdentifiers.begin(), CurContextIdentifiers.end(), 4163261991Sdim Name) != CurContextIdentifiers.end()) { 4164261991Sdim // Rebuild the NestedNameSpecifier as a globally-qualified specifier. 4165234353Sdim NNS = NestedNameSpecifier::GlobalSpecifier(Context); 4166261991Sdim NumSpecifiers = 4167276479Sdim buildNestedNameSpecifier(FullNamespaceDeclChain, NNS); 4168234353Sdim } 4169234353Sdim } 4170234353Sdim 4171234353Sdim // If the built NestedNameSpecifier would be replacing an existing 4172234353Sdim // NestedNameSpecifier, use the number of component identifiers that 4173234353Sdim // would need to be changed as the edit distance instead of the number 4174234353Sdim // of components in the built NestedNameSpecifier. 4175234353Sdim if (NNS && !CurNameSpecifierIdentifiers.empty()) { 4176234353Sdim SmallVector<const IdentifierInfo*, 4> NewNameSpecifierIdentifiers; 4177234353Sdim getNestedNameSpecifierIdentifiers(NNS, NewNameSpecifierIdentifiers); 4178234353Sdim NumSpecifiers = llvm::ComputeEditDistance( 4179280031Sdim llvm::makeArrayRef(CurNameSpecifierIdentifiers), 4180280031Sdim llvm::makeArrayRef(NewNameSpecifierIdentifiers)); 4181234353Sdim } 4182234353Sdim 4183276479Sdim SpecifierInfo SI = {Ctx, NNS, NumSpecifiers}; 4184276479Sdim DistanceMap[NumSpecifiers].push_back(SI); 4185224145Sdim} 4186224145Sdim 4187218893Sdim/// \brief Perform name lookup for a possible result for typo correction. 4188218893Sdimstatic void LookupPotentialTypoResult(Sema &SemaRef, 4189218893Sdim LookupResult &Res, 4190218893Sdim IdentifierInfo *Name, 4191218893Sdim Scope *S, CXXScopeSpec *SS, 4192218893Sdim DeclContext *MemberContext, 4193218893Sdim bool EnteringContext, 4194261991Sdim bool isObjCIvarLookup, 4195261991Sdim bool FindHidden) { 4196218893Sdim Res.suppressDiagnostics(); 4197218893Sdim Res.clear(); 4198218893Sdim Res.setLookupName(Name); 4199261991Sdim Res.setAllowHidden(FindHidden); 4200218893Sdim if (MemberContext) { 4201218893Sdim if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(MemberContext)) { 4202234353Sdim if (isObjCIvarLookup) { 4203218893Sdim if (ObjCIvarDecl *Ivar = Class->lookupInstanceVariable(Name)) { 4204218893Sdim Res.addDecl(Ivar); 4205218893Sdim Res.resolveKind(); 4206218893Sdim return; 4207218893Sdim } 4208218893Sdim } 4209218893Sdim 4210218893Sdim if (ObjCPropertyDecl *Prop = Class->FindPropertyDeclaration(Name)) { 4211218893Sdim Res.addDecl(Prop); 4212218893Sdim Res.resolveKind(); 4213218893Sdim return; 4214218893Sdim } 4215218893Sdim } 4216218893Sdim 4217218893Sdim SemaRef.LookupQualifiedName(Res, MemberContext); 4218218893Sdim return; 4219218893Sdim } 4220218893Sdim 4221218893Sdim SemaRef.LookupParsedName(Res, S, SS, /*AllowBuiltinCreation=*/false, 4222218893Sdim EnteringContext); 4223218893Sdim 4224218893Sdim // Fake ivar lookup; this should really be part of 4225218893Sdim // LookupParsedName. 4226218893Sdim if (ObjCMethodDecl *Method = SemaRef.getCurMethodDecl()) { 4227218893Sdim if (Method->isInstanceMethod() && Method->getClassInterface() && 4228218893Sdim (Res.empty() || 4229218893Sdim (Res.isSingleResult() && 4230218893Sdim Res.getFoundDecl()->isDefinedOutsideFunctionOrMethod()))) { 4231218893Sdim if (ObjCIvarDecl *IV 4232218893Sdim = Method->getClassInterface()->lookupInstanceVariable(Name)) { 4233218893Sdim Res.addDecl(IV); 4234218893Sdim Res.resolveKind(); 4235218893Sdim } 4236218893Sdim } 4237218893Sdim } 4238218893Sdim} 4239218893Sdim 4240224145Sdim/// \brief Add keywords to the consumer as possible typo corrections. 4241224145Sdimstatic void AddKeywordsToConsumer(Sema &SemaRef, 4242224145Sdim TypoCorrectionConsumer &Consumer, 4243239462Sdim Scope *S, CorrectionCandidateCallback &CCC, 4244239462Sdim bool AfterNestedNameSpecifier) { 4245239462Sdim if (AfterNestedNameSpecifier) { 4246239462Sdim // For 'X::', we know exactly which keywords can appear next. 4247239462Sdim Consumer.addKeywordResult("template"); 4248239462Sdim if (CCC.WantExpressionKeywords) 4249239462Sdim Consumer.addKeywordResult("operator"); 4250239462Sdim return; 4251239462Sdim } 4252239462Sdim 4253234353Sdim if (CCC.WantObjCSuper) 4254234353Sdim Consumer.addKeywordResult("super"); 4255224145Sdim 4256234353Sdim if (CCC.WantTypeSpecifiers) { 4257224145Sdim // Add type-specifier keywords to the set of results. 4258261991Sdim static const char *const CTypeSpecs[] = { 4259224145Sdim "char", "const", "double", "enum", "float", "int", "long", "short", 4260224145Sdim "signed", "struct", "union", "unsigned", "void", "volatile", 4261224145Sdim "_Complex", "_Imaginary", 4262224145Sdim // storage-specifiers as well 4263224145Sdim "extern", "inline", "static", "typedef" 4264224145Sdim }; 4265224145Sdim 4266261991Sdim const unsigned NumCTypeSpecs = llvm::array_lengthof(CTypeSpecs); 4267224145Sdim for (unsigned I = 0; I != NumCTypeSpecs; ++I) 4268224145Sdim Consumer.addKeywordResult(CTypeSpecs[I]); 4269224145Sdim 4270234353Sdim if (SemaRef.getLangOpts().C99) 4271224145Sdim Consumer.addKeywordResult("restrict"); 4272234353Sdim if (SemaRef.getLangOpts().Bool || SemaRef.getLangOpts().CPlusPlus) 4273224145Sdim Consumer.addKeywordResult("bool"); 4274234353Sdim else if (SemaRef.getLangOpts().C99) 4275224145Sdim Consumer.addKeywordResult("_Bool"); 4276224145Sdim 4277234353Sdim if (SemaRef.getLangOpts().CPlusPlus) { 4278224145Sdim Consumer.addKeywordResult("class"); 4279224145Sdim Consumer.addKeywordResult("typename"); 4280224145Sdim Consumer.addKeywordResult("wchar_t"); 4281224145Sdim 4282249423Sdim if (SemaRef.getLangOpts().CPlusPlus11) { 4283224145Sdim Consumer.addKeywordResult("char16_t"); 4284224145Sdim Consumer.addKeywordResult("char32_t"); 4285224145Sdim Consumer.addKeywordResult("constexpr"); 4286224145Sdim Consumer.addKeywordResult("decltype"); 4287224145Sdim Consumer.addKeywordResult("thread_local"); 4288224145Sdim } 4289224145Sdim } 4290224145Sdim 4291234353Sdim if (SemaRef.getLangOpts().GNUMode) 4292224145Sdim Consumer.addKeywordResult("typeof"); 4293280031Sdim } else if (CCC.WantFunctionLikeCasts) { 4294280031Sdim static const char *const CastableTypeSpecs[] = { 4295280031Sdim "char", "double", "float", "int", "long", "short", 4296280031Sdim "signed", "unsigned", "void" 4297280031Sdim }; 4298280031Sdim for (auto *kw : CastableTypeSpecs) 4299280031Sdim Consumer.addKeywordResult(kw); 4300224145Sdim } 4301224145Sdim 4302234353Sdim if (CCC.WantCXXNamedCasts && SemaRef.getLangOpts().CPlusPlus) { 4303224145Sdim Consumer.addKeywordResult("const_cast"); 4304224145Sdim Consumer.addKeywordResult("dynamic_cast"); 4305224145Sdim Consumer.addKeywordResult("reinterpret_cast"); 4306224145Sdim Consumer.addKeywordResult("static_cast"); 4307224145Sdim } 4308224145Sdim 4309234353Sdim if (CCC.WantExpressionKeywords) { 4310224145Sdim Consumer.addKeywordResult("sizeof"); 4311234353Sdim if (SemaRef.getLangOpts().Bool || SemaRef.getLangOpts().CPlusPlus) { 4312224145Sdim Consumer.addKeywordResult("false"); 4313224145Sdim Consumer.addKeywordResult("true"); 4314224145Sdim } 4315224145Sdim 4316234353Sdim if (SemaRef.getLangOpts().CPlusPlus) { 4317261991Sdim static const char *const CXXExprs[] = { 4318224145Sdim "delete", "new", "operator", "throw", "typeid" 4319224145Sdim }; 4320261991Sdim const unsigned NumCXXExprs = llvm::array_lengthof(CXXExprs); 4321224145Sdim for (unsigned I = 0; I != NumCXXExprs; ++I) 4322224145Sdim Consumer.addKeywordResult(CXXExprs[I]); 4323224145Sdim 4324224145Sdim if (isa<CXXMethodDecl>(SemaRef.CurContext) && 4325224145Sdim cast<CXXMethodDecl>(SemaRef.CurContext)->isInstance()) 4326224145Sdim Consumer.addKeywordResult("this"); 4327224145Sdim 4328249423Sdim if (SemaRef.getLangOpts().CPlusPlus11) { 4329224145Sdim Consumer.addKeywordResult("alignof"); 4330224145Sdim Consumer.addKeywordResult("nullptr"); 4331224145Sdim } 4332224145Sdim } 4333239462Sdim 4334239462Sdim if (SemaRef.getLangOpts().C11) { 4335239462Sdim // FIXME: We should not suggest _Alignof if the alignof macro 4336239462Sdim // is present. 4337239462Sdim Consumer.addKeywordResult("_Alignof"); 4338239462Sdim } 4339224145Sdim } 4340224145Sdim 4341234353Sdim if (CCC.WantRemainingKeywords) { 4342224145Sdim if (SemaRef.getCurFunctionOrMethodDecl() || SemaRef.getCurBlock()) { 4343224145Sdim // Statements. 4344261991Sdim static const char *const CStmts[] = { 4345224145Sdim "do", "else", "for", "goto", "if", "return", "switch", "while" }; 4346261991Sdim const unsigned NumCStmts = llvm::array_lengthof(CStmts); 4347224145Sdim for (unsigned I = 0; I != NumCStmts; ++I) 4348224145Sdim Consumer.addKeywordResult(CStmts[I]); 4349224145Sdim 4350234353Sdim if (SemaRef.getLangOpts().CPlusPlus) { 4351224145Sdim Consumer.addKeywordResult("catch"); 4352224145Sdim Consumer.addKeywordResult("try"); 4353224145Sdim } 4354224145Sdim 4355224145Sdim if (S && S->getBreakParent()) 4356224145Sdim Consumer.addKeywordResult("break"); 4357224145Sdim 4358224145Sdim if (S && S->getContinueParent()) 4359224145Sdim Consumer.addKeywordResult("continue"); 4360224145Sdim 4361224145Sdim if (!SemaRef.getCurFunction()->SwitchStack.empty()) { 4362224145Sdim Consumer.addKeywordResult("case"); 4363224145Sdim Consumer.addKeywordResult("default"); 4364224145Sdim } 4365224145Sdim } else { 4366234353Sdim if (SemaRef.getLangOpts().CPlusPlus) { 4367224145Sdim Consumer.addKeywordResult("namespace"); 4368224145Sdim Consumer.addKeywordResult("template"); 4369224145Sdim } 4370224145Sdim 4371224145Sdim if (S && S->isClassScope()) { 4372224145Sdim Consumer.addKeywordResult("explicit"); 4373224145Sdim Consumer.addKeywordResult("friend"); 4374224145Sdim Consumer.addKeywordResult("mutable"); 4375224145Sdim Consumer.addKeywordResult("private"); 4376224145Sdim Consumer.addKeywordResult("protected"); 4377224145Sdim Consumer.addKeywordResult("public"); 4378224145Sdim Consumer.addKeywordResult("virtual"); 4379224145Sdim } 4380224145Sdim } 4381224145Sdim 4382234353Sdim if (SemaRef.getLangOpts().CPlusPlus) { 4383224145Sdim Consumer.addKeywordResult("using"); 4384224145Sdim 4385249423Sdim if (SemaRef.getLangOpts().CPlusPlus11) 4386224145Sdim Consumer.addKeywordResult("static_assert"); 4387224145Sdim } 4388224145Sdim } 4389224145Sdim} 4390224145Sdim 4391280031Sdimstd::unique_ptr<TypoCorrectionConsumer> Sema::makeTypoCorrectionConsumer( 4392280031Sdim const DeclarationNameInfo &TypoName, Sema::LookupNameKind LookupKind, 4393280031Sdim Scope *S, CXXScopeSpec *SS, 4394280031Sdim std::unique_ptr<CorrectionCandidateCallback> CCC, 4395280031Sdim DeclContext *MemberContext, bool EnteringContext, 4396280031Sdim const ObjCObjectPointerType *OPT, bool ErrorRecovery) { 4397261991Sdim 4398261991Sdim if (Diags.hasFatalErrorOccurred() || !getLangOpts().SpellChecking || 4399261991Sdim DisableTypoCorrection) 4400280031Sdim return nullptr; 4401203955Srdivacky 4402234353Sdim // In Microsoft mode, don't perform typo correction in a template member 4403234353Sdim // function dependent context because it interferes with the "lookup into 4404234353Sdim // dependent bases of class templates" feature. 4405276479Sdim if (getLangOpts().MSVCCompat && CurContext->isDependentContext() && 4406234353Sdim isa<CXXMethodDecl>(CurContext)) 4407280031Sdim return nullptr; 4408234353Sdim 4409201361Srdivacky // We only attempt to correct typos for identifiers. 4410224145Sdim IdentifierInfo *Typo = TypoName.getName().getAsIdentifierInfo(); 4411201361Srdivacky if (!Typo) 4412280031Sdim return nullptr; 4413201361Srdivacky 4414201361Srdivacky // If the scope specifier itself was invalid, don't try to correct 4415201361Srdivacky // typos. 4416201361Srdivacky if (SS && SS->isInvalid()) 4417280031Sdim return nullptr; 4418201361Srdivacky 4419201361Srdivacky // Never try to correct typos during template deduction or 4420201361Srdivacky // instantiation. 4421201361Srdivacky if (!ActiveTemplateInstantiations.empty()) 4422280031Sdim return nullptr; 4423218893Sdim 4424249423Sdim // Don't try to correct 'super'. 4425249423Sdim if (S && S->isInObjcMethodScope() && Typo == getSuperIdentifier()) 4426280031Sdim return nullptr; 4427249423Sdim 4428261991Sdim // Abort if typo correction already failed for this specific typo. 4429261991Sdim IdentifierSourceLocations::iterator locs = TypoCorrectionFailures.find(Typo); 4430261991Sdim if (locs != TypoCorrectionFailures.end() && 4431261991Sdim locs->second.count(TypoName.getLoc())) 4432280031Sdim return nullptr; 4433261991Sdim 4434261991Sdim // Don't try to correct the identifier "vector" when in AltiVec mode. 4435261991Sdim // TODO: Figure out why typo correction misbehaves in this case, fix it, and 4436261991Sdim // remove this workaround. 4437288943Sdim if ((getLangOpts().AltiVec || getLangOpts().ZVector) && Typo->isStr("vector")) 4438280031Sdim return nullptr; 4439261991Sdim 4440280031Sdim // Provide a stop gap for files that are just seriously broken. Trying 4441280031Sdim // to correct all typos can turn into a HUGE performance penalty, causing 4442280031Sdim // some files to take minutes to get rejected by the parser. 4443280031Sdim unsigned Limit = getDiagnostics().getDiagnosticOptions().SpellCheckingLimit; 4444280031Sdim if (Limit && TyposCorrected >= Limit) 4445280031Sdim return nullptr; 4446280031Sdim ++TyposCorrected; 4447280031Sdim 4448276479Sdim // If we're handling a missing symbol error, using modules, and the 4449276479Sdim // special search all modules option is used, look for a missing import. 4450280031Sdim if (ErrorRecovery && getLangOpts().Modules && 4451276479Sdim getLangOpts().ModulesSearchAll) { 4452276479Sdim // The following has the side effect of loading the missing module. 4453276479Sdim getModuleLoader().lookupMissingImports(Typo->getName(), 4454276479Sdim TypoName.getLocStart()); 4455276479Sdim } 4456218893Sdim 4457280031Sdim CorrectionCandidateCallback &CCCRef = *CCC; 4458280031Sdim auto Consumer = llvm::make_unique<TypoCorrectionConsumer>( 4459280031Sdim *this, TypoName, LookupKind, S, SS, std::move(CCC), MemberContext, 4460280031Sdim EnteringContext); 4461224145Sdim 4462207619Srdivacky // Perform name lookup to find visible, similarly-named entities. 4463218893Sdim bool IsUnqualifiedLookup = false; 4464234353Sdim DeclContext *QualifiedDC = MemberContext; 4465202379Srdivacky if (MemberContext) { 4466280031Sdim LookupVisibleDecls(MemberContext, LookupKind, *Consumer); 4467202379Srdivacky 4468202379Srdivacky // Look in qualified interfaces. 4469202379Srdivacky if (OPT) { 4470276479Sdim for (auto *I : OPT->quals()) 4471280031Sdim LookupVisibleDecls(I, LookupKind, *Consumer); 4472202379Srdivacky } 4473202379Srdivacky } else if (SS && SS->isSet()) { 4474234353Sdim QualifiedDC = computeDeclContext(*SS, EnteringContext); 4475234353Sdim if (!QualifiedDC) 4476280031Sdim return nullptr; 4477218893Sdim 4478280031Sdim LookupVisibleDecls(QualifiedDC, LookupKind, *Consumer); 4479201361Srdivacky } else { 4480218893Sdim IsUnqualifiedLookup = true; 4481234353Sdim } 4482218893Sdim 4483234353Sdim // Determine whether we are going to search in the various namespaces for 4484234353Sdim // corrections. 4485234353Sdim bool SearchNamespaces 4486234353Sdim = getLangOpts().CPlusPlus && 4487261991Sdim (IsUnqualifiedLookup || (SS && SS->isSet())); 4488261991Sdim 4489234353Sdim if (IsUnqualifiedLookup || SearchNamespaces) { 4490234353Sdim // For unqualified lookup, look through all of the names that we have 4491234353Sdim // seen in this translation unit. 4492234353Sdim // FIXME: Re-add the ability to skip very unlikely potential corrections. 4493276479Sdim for (const auto &I : Context.Idents) 4494280031Sdim Consumer->FoundName(I.getKey()); 4495218893Sdim 4496234353Sdim // Walk through identifiers in external identifier sources. 4497234353Sdim // FIXME: Re-add the ability to skip very unlikely potential corrections. 4498234353Sdim if (IdentifierInfoLookup *External 4499234353Sdim = Context.Idents.getExternalIdentifierLookup()) { 4500276479Sdim std::unique_ptr<IdentifierIterator> Iter(External->getIdentifiers()); 4501234353Sdim do { 4502234353Sdim StringRef Name = Iter->Next(); 4503234353Sdim if (Name.empty()) 4504234353Sdim break; 4505218893Sdim 4506280031Sdim Consumer->FoundName(Name); 4507234353Sdim } while (true); 4508218893Sdim } 4509201361Srdivacky } 4510201361Srdivacky 4511280031Sdim AddKeywordsToConsumer(*this, *Consumer, S, CCCRef, SS && SS->isNotEmpty()); 4512218893Sdim 4513234353Sdim // Build the NestedNameSpecifiers for the KnownNamespaces, if we're going 4514234353Sdim // to search those namespaces. 4515234353Sdim if (SearchNamespaces) { 4516224145Sdim // Load any externally-known namespaces. 4517224145Sdim if (ExternalSource && !LoadedExternalKnownNamespaces) { 4518226633Sdim SmallVector<NamespaceDecl *, 4> ExternalKnownNamespaces; 4519224145Sdim LoadedExternalKnownNamespaces = true; 4520224145Sdim ExternalSource->ReadKnownNamespaces(ExternalKnownNamespaces); 4521276479Sdim for (auto *N : ExternalKnownNamespaces) 4522276479Sdim KnownNamespaces[N] = true; 4523207619Srdivacky } 4524261991Sdim 4525280031Sdim Consumer->addNamespaces(KnownNamespaces); 4526207619Srdivacky } 4527218893Sdim 4528280031Sdim return Consumer; 4529280031Sdim} 4530280031Sdim 4531280031Sdim/// \brief Try to "correct" a typo in the source code by finding 4532280031Sdim/// visible declarations whose names are similar to the name that was 4533280031Sdim/// present in the source code. 4534280031Sdim/// 4535280031Sdim/// \param TypoName the \c DeclarationNameInfo structure that contains 4536280031Sdim/// the name that was present in the source code along with its location. 4537280031Sdim/// 4538280031Sdim/// \param LookupKind the name-lookup criteria used to search for the name. 4539280031Sdim/// 4540280031Sdim/// \param S the scope in which name lookup occurs. 4541280031Sdim/// 4542280031Sdim/// \param SS the nested-name-specifier that precedes the name we're 4543280031Sdim/// looking for, if present. 4544280031Sdim/// 4545280031Sdim/// \param CCC A CorrectionCandidateCallback object that provides further 4546280031Sdim/// validation of typo correction candidates. It also provides flags for 4547280031Sdim/// determining the set of keywords permitted. 4548280031Sdim/// 4549280031Sdim/// \param MemberContext if non-NULL, the context in which to look for 4550280031Sdim/// a member access expression. 4551280031Sdim/// 4552280031Sdim/// \param EnteringContext whether we're entering the context described by 4553280031Sdim/// the nested-name-specifier SS. 4554280031Sdim/// 4555280031Sdim/// \param OPT when non-NULL, the search for visible declarations will 4556280031Sdim/// also walk the protocols in the qualified interfaces of \p OPT. 4557280031Sdim/// 4558280031Sdim/// \returns a \c TypoCorrection containing the corrected name if the typo 4559280031Sdim/// along with information such as the \c NamedDecl where the corrected name 4560280031Sdim/// was declared, and any additional \c NestedNameSpecifier needed to access 4561280031Sdim/// it (C++ only). The \c TypoCorrection is empty if there is no correction. 4562280031SdimTypoCorrection Sema::CorrectTypo(const DeclarationNameInfo &TypoName, 4563280031Sdim Sema::LookupNameKind LookupKind, 4564280031Sdim Scope *S, CXXScopeSpec *SS, 4565280031Sdim std::unique_ptr<CorrectionCandidateCallback> CCC, 4566280031Sdim CorrectTypoKind Mode, 4567280031Sdim DeclContext *MemberContext, 4568280031Sdim bool EnteringContext, 4569280031Sdim const ObjCObjectPointerType *OPT, 4570280031Sdim bool RecordFailure) { 4571280031Sdim assert(CCC && "CorrectTypo requires a CorrectionCandidateCallback"); 4572280031Sdim 4573280031Sdim // Always let the ExternalSource have the first chance at correction, even 4574280031Sdim // if we would otherwise have given up. 4575280031Sdim if (ExternalSource) { 4576280031Sdim if (TypoCorrection Correction = ExternalSource->CorrectTypo( 4577280031Sdim TypoName, LookupKind, S, SS, *CCC, MemberContext, EnteringContext, OPT)) 4578280031Sdim return Correction; 4579280031Sdim } 4580280031Sdim 4581280031Sdim // Ugly hack equivalent to CTC == CTC_ObjCMessageReceiver; 4582280031Sdim // WantObjCSuper is only true for CTC_ObjCMessageReceiver and for 4583280031Sdim // some instances of CTC_Unknown, while WantRemainingKeywords is true 4584280031Sdim // for CTC_Unknown but not for CTC_ObjCMessageReceiver. 4585280031Sdim bool ObjCMessageReceiver = CCC->WantObjCSuper && !CCC->WantRemainingKeywords; 4586280031Sdim 4587280031Sdim IdentifierInfo *Typo = TypoName.getName().getAsIdentifierInfo(); 4588280031Sdim auto Consumer = makeTypoCorrectionConsumer( 4589280031Sdim TypoName, LookupKind, S, SS, std::move(CCC), MemberContext, 4590280031Sdim EnteringContext, OPT, Mode == CTK_ErrorRecovery); 4591280031Sdim 4592280031Sdim if (!Consumer) 4593280031Sdim return TypoCorrection(); 4594280031Sdim 4595280031Sdim // If we haven't found anything, we're done. 4596280031Sdim if (Consumer->empty()) 4597280031Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4598280031Sdim 4599280031Sdim // Make sure the best edit distance (prior to adding any namespace qualifiers) 4600280031Sdim // is not more that about a third of the length of the typo's identifier. 4601280031Sdim unsigned ED = Consumer->getBestEditDistance(true); 4602280031Sdim unsigned TypoLen = Typo->getName().size(); 4603280031Sdim if (ED > 0 && TypoLen / ED < 3) 4604280031Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4605280031Sdim 4606280031Sdim TypoCorrection BestTC = Consumer->getNextCorrection(); 4607280031Sdim TypoCorrection SecondBestTC = Consumer->getNextCorrection(); 4608276479Sdim if (!BestTC) 4609261991Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4610218893Sdim 4611276479Sdim ED = BestTC.getEditDistance(); 4612201361Srdivacky 4613280031Sdim if (TypoLen >= 3 && ED > 0 && TypoLen / ED < 3) { 4614234353Sdim // If this was an unqualified lookup and we believe the callback 4615234353Sdim // object wouldn't have filtered out possible corrections, note 4616234353Sdim // that no correction was found. 4617280031Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4618218893Sdim } 4619218893Sdim 4620218893Sdim // If only a single name remains, return that result. 4621276479Sdim if (!SecondBestTC || 4622276479Sdim SecondBestTC.getEditDistance(false) > BestTC.getEditDistance(false)) { 4623276479Sdim const TypoCorrection &Result = BestTC; 4624218893Sdim 4625224145Sdim // Don't correct to a keyword that's the same as the typo; the keyword 4626224145Sdim // wasn't actually in scope. 4627261991Sdim if (ED == 0 && Result.isKeyword()) 4628261991Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4629218893Sdim 4630243830Sdim TypoCorrection TC = Result; 4631243830Sdim TC.setCorrectionRange(SS, TypoName); 4632276479Sdim checkCorrectionVisibility(*this, TC); 4633243830Sdim return TC; 4634280031Sdim } else if (SecondBestTC && ObjCMessageReceiver) { 4635224145Sdim // Prefer 'super' when we're completing in a message-receiver 4636218893Sdim // context. 4637201361Srdivacky 4638276479Sdim if (BestTC.getCorrection().getAsString() != "super") { 4639276479Sdim if (SecondBestTC.getCorrection().getAsString() == "super") 4640276479Sdim BestTC = SecondBestTC; 4641280031Sdim else if ((*Consumer)["super"].front().isKeyword()) 4642280031Sdim BestTC = (*Consumer)["super"].front(); 4643276479Sdim } 4644218893Sdim // Don't correct to a keyword that's the same as the typo; the keyword 4645218893Sdim // wasn't actually in scope. 4646276479Sdim if (BestTC.getEditDistance() == 0 || 4647276479Sdim BestTC.getCorrection().getAsString() != "super") 4648261991Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure); 4649202379Srdivacky 4650276479Sdim BestTC.setCorrectionRange(SS, TypoName); 4651276479Sdim return BestTC; 4652201361Srdivacky } 4653201361Srdivacky 4654276479Sdim // Record the failure's location if needed and return an empty correction. If 4655276479Sdim // this was an unqualified lookup and we believe the callback object did not 4656276479Sdim // filter out possible corrections, also cache the failure for the typo. 4657288943Sdim return FailedCorrection(Typo, TypoName.getLoc(), RecordFailure && !SecondBestTC); 4658201361Srdivacky} 4659224145Sdim 4660280031Sdim/// \brief Try to "correct" a typo in the source code by finding 4661280031Sdim/// visible declarations whose names are similar to the name that was 4662280031Sdim/// present in the source code. 4663280031Sdim/// 4664280031Sdim/// \param TypoName the \c DeclarationNameInfo structure that contains 4665280031Sdim/// the name that was present in the source code along with its location. 4666280031Sdim/// 4667280031Sdim/// \param LookupKind the name-lookup criteria used to search for the name. 4668280031Sdim/// 4669280031Sdim/// \param S the scope in which name lookup occurs. 4670280031Sdim/// 4671280031Sdim/// \param SS the nested-name-specifier that precedes the name we're 4672280031Sdim/// looking for, if present. 4673280031Sdim/// 4674280031Sdim/// \param CCC A CorrectionCandidateCallback object that provides further 4675280031Sdim/// validation of typo correction candidates. It also provides flags for 4676280031Sdim/// determining the set of keywords permitted. 4677280031Sdim/// 4678280031Sdim/// \param TDG A TypoDiagnosticGenerator functor that will be used to print 4679280031Sdim/// diagnostics when the actual typo correction is attempted. 4680280031Sdim/// 4681280031Sdim/// \param TRC A TypoRecoveryCallback functor that will be used to build an 4682280031Sdim/// Expr from a typo correction candidate. 4683280031Sdim/// 4684280031Sdim/// \param MemberContext if non-NULL, the context in which to look for 4685280031Sdim/// a member access expression. 4686280031Sdim/// 4687280031Sdim/// \param EnteringContext whether we're entering the context described by 4688280031Sdim/// the nested-name-specifier SS. 4689280031Sdim/// 4690280031Sdim/// \param OPT when non-NULL, the search for visible declarations will 4691280031Sdim/// also walk the protocols in the qualified interfaces of \p OPT. 4692280031Sdim/// 4693280031Sdim/// \returns a new \c TypoExpr that will later be replaced in the AST with an 4694280031Sdim/// Expr representing the result of performing typo correction, or nullptr if 4695280031Sdim/// typo correction is not possible. If nullptr is returned, no diagnostics will 4696280031Sdim/// be emitted and it is the responsibility of the caller to emit any that are 4697280031Sdim/// needed. 4698280031SdimTypoExpr *Sema::CorrectTypoDelayed( 4699280031Sdim const DeclarationNameInfo &TypoName, Sema::LookupNameKind LookupKind, 4700280031Sdim Scope *S, CXXScopeSpec *SS, 4701280031Sdim std::unique_ptr<CorrectionCandidateCallback> CCC, 4702280031Sdim TypoDiagnosticGenerator TDG, TypoRecoveryCallback TRC, CorrectTypoKind Mode, 4703280031Sdim DeclContext *MemberContext, bool EnteringContext, 4704280031Sdim const ObjCObjectPointerType *OPT) { 4705280031Sdim assert(CCC && "CorrectTypoDelayed requires a CorrectionCandidateCallback"); 4706280031Sdim 4707280031Sdim TypoCorrection Empty; 4708280031Sdim auto Consumer = makeTypoCorrectionConsumer( 4709280031Sdim TypoName, LookupKind, S, SS, std::move(CCC), MemberContext, 4710288943Sdim EnteringContext, OPT, Mode == CTK_ErrorRecovery); 4711280031Sdim 4712280031Sdim if (!Consumer || Consumer->empty()) 4713280031Sdim return nullptr; 4714280031Sdim 4715280031Sdim // Make sure the best edit distance (prior to adding any namespace qualifiers) 4716280031Sdim // is not more that about a third of the length of the typo's identifier. 4717280031Sdim unsigned ED = Consumer->getBestEditDistance(true); 4718280031Sdim IdentifierInfo *Typo = TypoName.getName().getAsIdentifierInfo(); 4719280031Sdim if (ED > 0 && Typo->getName().size() / ED < 3) 4720280031Sdim return nullptr; 4721280031Sdim 4722280031Sdim ExprEvalContexts.back().NumTypos++; 4723280031Sdim return createDelayedTypo(std::move(Consumer), std::move(TDG), std::move(TRC)); 4724280031Sdim} 4725280031Sdim 4726226633Sdimvoid TypoCorrection::addCorrectionDecl(NamedDecl *CDecl) { 4727226633Sdim if (!CDecl) return; 4728226633Sdim 4729226633Sdim if (isKeyword()) 4730226633Sdim CorrectionDecls.clear(); 4731226633Sdim 4732296417Sdim CorrectionDecls.push_back(CDecl); 4733226633Sdim 4734226633Sdim if (!CorrectionName) 4735226633Sdim CorrectionName = CDecl->getDeclName(); 4736226633Sdim} 4737226633Sdim 4738224145Sdimstd::string TypoCorrection::getAsString(const LangOptions &LO) const { 4739224145Sdim if (CorrectionNameSpec) { 4740224145Sdim std::string tmpBuffer; 4741224145Sdim llvm::raw_string_ostream PrefixOStream(tmpBuffer); 4742224145Sdim CorrectionNameSpec->print(PrefixOStream, PrintingPolicy(LO)); 4743261991Sdim PrefixOStream << CorrectionName; 4744234982Sdim return PrefixOStream.str(); 4745224145Sdim } 4746224145Sdim 4747224145Sdim return CorrectionName.getAsString(); 4748224145Sdim} 4749249423Sdim 4750280031Sdimbool CorrectionCandidateCallback::ValidateCandidate( 4751280031Sdim const TypoCorrection &candidate) { 4752249423Sdim if (!candidate.isResolved()) 4753249423Sdim return true; 4754249423Sdim 4755249423Sdim if (candidate.isKeyword()) 4756249423Sdim return WantTypeSpecifiers || WantExpressionKeywords || WantCXXNamedCasts || 4757249423Sdim WantRemainingKeywords || WantObjCSuper; 4758249423Sdim 4759276479Sdim bool HasNonType = false; 4760276479Sdim bool HasStaticMethod = false; 4761276479Sdim bool HasNonStaticMethod = false; 4762276479Sdim for (Decl *D : candidate) { 4763276479Sdim if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D)) 4764276479Sdim D = FTD->getTemplatedDecl(); 4765276479Sdim if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 4766276479Sdim if (Method->isStatic()) 4767276479Sdim HasStaticMethod = true; 4768276479Sdim else 4769276479Sdim HasNonStaticMethod = true; 4770276479Sdim } 4771276479Sdim if (!isa<TypeDecl>(D)) 4772276479Sdim HasNonType = true; 4773249423Sdim } 4774249423Sdim 4775276479Sdim if (IsAddressOfOperand && HasNonStaticMethod && !HasStaticMethod && 4776276479Sdim !candidate.getCorrectionSpecifier()) 4777276479Sdim return false; 4778276479Sdim 4779276479Sdim return WantTypeSpecifiers || HasNonType; 4780249423Sdim} 4781261991Sdim 4782261991SdimFunctionCallFilterCCC::FunctionCallFilterCCC(Sema &SemaRef, unsigned NumArgs, 4783276479Sdim bool HasExplicitTemplateArgs, 4784276479Sdim MemberExpr *ME) 4785276479Sdim : NumArgs(NumArgs), HasExplicitTemplateArgs(HasExplicitTemplateArgs), 4786276479Sdim CurContext(SemaRef.CurContext), MemberFn(ME) { 4787280031Sdim WantTypeSpecifiers = false; 4788280031Sdim WantFunctionLikeCasts = SemaRef.getLangOpts().CPlusPlus && NumArgs == 1; 4789261991Sdim WantRemainingKeywords = false; 4790261991Sdim} 4791261991Sdim 4792261991Sdimbool FunctionCallFilterCCC::ValidateCandidate(const TypoCorrection &candidate) { 4793261991Sdim if (!candidate.getCorrectionDecl()) 4794261991Sdim return candidate.isKeyword(); 4795261991Sdim 4796276479Sdim for (auto *C : candidate) { 4797276479Sdim FunctionDecl *FD = nullptr; 4798276479Sdim NamedDecl *ND = C->getUnderlyingDecl(); 4799261991Sdim if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 4800261991Sdim FD = FTD->getTemplatedDecl(); 4801261991Sdim if (!HasExplicitTemplateArgs && !FD) { 4802261991Sdim if (!(FD = dyn_cast<FunctionDecl>(ND)) && isa<ValueDecl>(ND)) { 4803261991Sdim // If the Decl is neither a function nor a template function, 4804261991Sdim // determine if it is a pointer or reference to a function. If so, 4805261991Sdim // check against the number of arguments expected for the pointee. 4806261991Sdim QualType ValType = cast<ValueDecl>(ND)->getType(); 4807261991Sdim if (ValType->isAnyPointerType() || ValType->isReferenceType()) 4808261991Sdim ValType = ValType->getPointeeType(); 4809261991Sdim if (const FunctionProtoType *FPT = ValType->getAs<FunctionProtoType>()) 4810276479Sdim if (FPT->getNumParams() == NumArgs) 4811261991Sdim return true; 4812261991Sdim } 4813261991Sdim } 4814276479Sdim 4815276479Sdim // Skip the current candidate if it is not a FunctionDecl or does not accept 4816276479Sdim // the current number of arguments. 4817276479Sdim if (!FD || !(FD->getNumParams() >= NumArgs && 4818276479Sdim FD->getMinRequiredArguments() <= NumArgs)) 4819276479Sdim continue; 4820276479Sdim 4821276479Sdim // If the current candidate is a non-static C++ method, skip the candidate 4822276479Sdim // unless the method being corrected--or the current DeclContext, if the 4823276479Sdim // function being corrected is not a method--is a method in the same class 4824276479Sdim // or a descendent class of the candidate's parent class. 4825276479Sdim if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 4826276479Sdim if (MemberFn || !MD->isStatic()) { 4827276479Sdim CXXMethodDecl *CurMD = 4828276479Sdim MemberFn 4829276479Sdim ? dyn_cast_or_null<CXXMethodDecl>(MemberFn->getMemberDecl()) 4830276479Sdim : dyn_cast_or_null<CXXMethodDecl>(CurContext); 4831276479Sdim CXXRecordDecl *CurRD = 4832276479Sdim CurMD ? CurMD->getParent()->getCanonicalDecl() : nullptr; 4833276479Sdim CXXRecordDecl *RD = MD->getParent()->getCanonicalDecl(); 4834276479Sdim if (!CurRD || (CurRD != RD && !CurRD->isDerivedFrom(RD))) 4835276479Sdim continue; 4836276479Sdim } 4837276479Sdim } 4838276479Sdim return true; 4839261991Sdim } 4840261991Sdim return false; 4841261991Sdim} 4842261991Sdim 4843261991Sdimvoid Sema::diagnoseTypo(const TypoCorrection &Correction, 4844261991Sdim const PartialDiagnostic &TypoDiag, 4845261991Sdim bool ErrorRecovery) { 4846261991Sdim diagnoseTypo(Correction, TypoDiag, PDiag(diag::note_previous_decl), 4847261991Sdim ErrorRecovery); 4848261991Sdim} 4849261991Sdim 4850261991Sdim/// Find which declaration we should import to provide the definition of 4851261991Sdim/// the given declaration. 4852288943Sdimstatic NamedDecl *getDefinitionToImport(NamedDecl *D) { 4853288943Sdim if (VarDecl *VD = dyn_cast<VarDecl>(D)) 4854261991Sdim return VD->getDefinition(); 4855261991Sdim if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) 4856288943Sdim return FD->isDefined(FD) ? const_cast<FunctionDecl*>(FD) : nullptr; 4857288943Sdim if (TagDecl *TD = dyn_cast<TagDecl>(D)) 4858261991Sdim return TD->getDefinition(); 4859288943Sdim if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) 4860261991Sdim return ID->getDefinition(); 4861288943Sdim if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) 4862261991Sdim return PD->getDefinition(); 4863288943Sdim if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 4864261991Sdim return getDefinitionToImport(TD->getTemplatedDecl()); 4865276479Sdim return nullptr; 4866261991Sdim} 4867261991Sdim 4868288943Sdimvoid Sema::diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl, 4869288943Sdim bool NeedDefinition, bool Recover) { 4870288943Sdim assert(!isVisible(Decl) && "missing import for non-hidden decl?"); 4871288943Sdim 4872288943Sdim // Suggest importing a module providing the definition of this entity, if 4873288943Sdim // possible. 4874288943Sdim NamedDecl *Def = getDefinitionToImport(Decl); 4875288943Sdim if (!Def) 4876288943Sdim Def = Decl; 4877288943Sdim 4878288943Sdim // FIXME: Add a Fix-It that imports the corresponding module or includes 4879288943Sdim // the header. 4880288943Sdim Module *Owner = getOwningModule(Decl); 4881288943Sdim assert(Owner && "definition of hidden declaration is not in a module"); 4882288943Sdim 4883288943Sdim llvm::SmallVector<Module*, 8> OwningModules; 4884288943Sdim OwningModules.push_back(Owner); 4885288943Sdim auto Merged = Context.getModulesWithMergedDefinition(Decl); 4886288943Sdim OwningModules.insert(OwningModules.end(), Merged.begin(), Merged.end()); 4887288943Sdim 4888288943Sdim diagnoseMissingImport(Loc, Decl, Decl->getLocation(), OwningModules, 4889288943Sdim NeedDefinition ? MissingImportKind::Definition 4890288943Sdim : MissingImportKind::Declaration, 4891288943Sdim Recover); 4892288943Sdim} 4893288943Sdim 4894288943Sdimvoid Sema::diagnoseMissingImport(SourceLocation UseLoc, NamedDecl *Decl, 4895288943Sdim SourceLocation DeclLoc, 4896288943Sdim ArrayRef<Module *> Modules, 4897288943Sdim MissingImportKind MIK, bool Recover) { 4898288943Sdim assert(!Modules.empty()); 4899288943Sdim 4900288943Sdim if (Modules.size() > 1) { 4901288943Sdim std::string ModuleList; 4902288943Sdim unsigned N = 0; 4903288943Sdim for (Module *M : Modules) { 4904288943Sdim ModuleList += "\n "; 4905288943Sdim if (++N == 5 && N != Modules.size()) { 4906288943Sdim ModuleList += "[...]"; 4907288943Sdim break; 4908288943Sdim } 4909288943Sdim ModuleList += M->getFullModuleName(); 4910288943Sdim } 4911288943Sdim 4912288943Sdim Diag(UseLoc, diag::err_module_unimported_use_multiple) 4913288943Sdim << (int)MIK << Decl << ModuleList; 4914288943Sdim } else { 4915288943Sdim Diag(UseLoc, diag::err_module_unimported_use) 4916288943Sdim << (int)MIK << Decl << Modules[0]->getFullModuleName(); 4917288943Sdim } 4918288943Sdim 4919288943Sdim unsigned DiagID; 4920288943Sdim switch (MIK) { 4921288943Sdim case MissingImportKind::Declaration: 4922288943Sdim DiagID = diag::note_previous_declaration; 4923288943Sdim break; 4924288943Sdim case MissingImportKind::Definition: 4925288943Sdim DiagID = diag::note_previous_definition; 4926288943Sdim break; 4927288943Sdim case MissingImportKind::DefaultArgument: 4928288943Sdim DiagID = diag::note_default_argument_declared_here; 4929288943Sdim break; 4930288943Sdim } 4931288943Sdim Diag(DeclLoc, DiagID); 4932288943Sdim 4933288943Sdim // Try to recover by implicitly importing this module. 4934288943Sdim if (Recover) 4935288943Sdim createImplicitModuleImportForErrorRecovery(UseLoc, Modules[0]); 4936288943Sdim} 4937288943Sdim 4938261991Sdim/// \brief Diagnose a successfully-corrected typo. Separated from the correction 4939261991Sdim/// itself to allow external validation of the result, etc. 4940261991Sdim/// 4941261991Sdim/// \param Correction The result of performing typo correction. 4942261991Sdim/// \param TypoDiag The diagnostic to produce. This will have the corrected 4943261991Sdim/// string added to it (and usually also a fixit). 4944261991Sdim/// \param PrevNote A note to use when indicating the location of the entity to 4945261991Sdim/// which we are correcting. Will have the correction string added to it. 4946261991Sdim/// \param ErrorRecovery If \c true (the default), the caller is going to 4947261991Sdim/// recover from the typo as if the corrected string had been typed. 4948261991Sdim/// In this case, \c PDiag must be an error, and we will attach a fixit 4949261991Sdim/// to it. 4950261991Sdimvoid Sema::diagnoseTypo(const TypoCorrection &Correction, 4951261991Sdim const PartialDiagnostic &TypoDiag, 4952261991Sdim const PartialDiagnostic &PrevNote, 4953261991Sdim bool ErrorRecovery) { 4954261991Sdim std::string CorrectedStr = Correction.getAsString(getLangOpts()); 4955261991Sdim std::string CorrectedQuotedStr = Correction.getQuoted(getLangOpts()); 4956261991Sdim FixItHint FixTypo = FixItHint::CreateReplacement( 4957261991Sdim Correction.getCorrectionRange(), CorrectedStr); 4958261991Sdim 4959261991Sdim // Maybe we're just missing a module import. 4960261991Sdim if (Correction.requiresImport()) { 4961296417Sdim NamedDecl *Decl = Correction.getFoundDecl(); 4962261991Sdim assert(Decl && "import required but no declaration to import"); 4963261991Sdim 4964288943Sdim diagnoseMissingImport(Correction.getCorrectionRange().getBegin(), Decl, 4965288943Sdim /*NeedDefinition*/ false, ErrorRecovery); 4966261991Sdim return; 4967261991Sdim } 4968261991Sdim 4969261991Sdim Diag(Correction.getCorrectionRange().getBegin(), TypoDiag) 4970261991Sdim << CorrectedQuotedStr << (ErrorRecovery ? FixTypo : FixItHint()); 4971261991Sdim 4972261991Sdim NamedDecl *ChosenDecl = 4973296417Sdim Correction.isKeyword() ? nullptr : Correction.getFoundDecl(); 4974261991Sdim if (PrevNote.getDiagID() && ChosenDecl) 4975261991Sdim Diag(ChosenDecl->getLocation(), PrevNote) 4976261991Sdim << CorrectedQuotedStr << (ErrorRecovery ? FixItHint() : FixTypo); 4977261991Sdim} 4978280031Sdim 4979280031SdimTypoExpr *Sema::createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC, 4980280031Sdim TypoDiagnosticGenerator TDG, 4981280031Sdim TypoRecoveryCallback TRC) { 4982280031Sdim assert(TCC && "createDelayedTypo requires a valid TypoCorrectionConsumer"); 4983280031Sdim auto TE = new (Context) TypoExpr(Context.DependentTy); 4984280031Sdim auto &State = DelayedTypos[TE]; 4985280031Sdim State.Consumer = std::move(TCC); 4986280031Sdim State.DiagHandler = std::move(TDG); 4987280031Sdim State.RecoveryHandler = std::move(TRC); 4988280031Sdim return TE; 4989280031Sdim} 4990280031Sdim 4991280031Sdimconst Sema::TypoExprState &Sema::getTypoExprState(TypoExpr *TE) const { 4992280031Sdim auto Entry = DelayedTypos.find(TE); 4993280031Sdim assert(Entry != DelayedTypos.end() && 4994280031Sdim "Failed to get the state for a TypoExpr!"); 4995280031Sdim return Entry->second; 4996280031Sdim} 4997280031Sdim 4998280031Sdimvoid Sema::clearDelayedTypo(TypoExpr *TE) { 4999280031Sdim DelayedTypos.erase(TE); 5000280031Sdim} 5001296417Sdim 5002296417Sdimvoid Sema::ActOnPragmaDump(Scope *S, SourceLocation IILoc, IdentifierInfo *II) { 5003296417Sdim DeclarationNameInfo Name(II, IILoc); 5004296417Sdim LookupResult R(*this, Name, LookupAnyName, Sema::NotForRedeclaration); 5005296417Sdim R.suppressDiagnostics(); 5006296417Sdim R.setHideTags(false); 5007296417Sdim LookupName(R, S); 5008296417Sdim R.dump(); 5009296417Sdim} 5010