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diff --git a/clang/lib/AST/ExternalASTMerger.cpp b/clang/lib/AST/ExternalASTMerger.cpp
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+//===- ExternalASTMerger.cpp - Merging External AST Interface ---*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the ExternalASTMerger, which vends a combination of
+// ASTs from several different ASTContext/FileManager pairs
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/ExternalASTMerger.h"
+
+using namespace clang;
+
+namespace {
+
+template <typename T> struct Source {
+ T t;
+ Source(T t) : t(t) {}
+ operator T() { return t; }
+ template <typename U = T> U &get() { return t; }
+ template <typename U = T> const U &get() const { return t; }
+ template <typename U> operator Source<U>() { return Source<U>(t); }
+};
+
+typedef std::pair<Source<NamedDecl *>, ASTImporter *> Candidate;
+
+/// For the given DC, return the DC that is safe to perform lookups on. This is
+/// the DC we actually want to work with most of the time.
+const DeclContext *CanonicalizeDC(const DeclContext *DC) {
+ if (isa<LinkageSpecDecl>(DC))
+ return DC->getRedeclContext();
+ return DC;
+}
+
+Source<const DeclContext *>
+LookupSameContext(Source<TranslationUnitDecl *> SourceTU, const DeclContext *DC,
+ ASTImporter &ReverseImporter) {
+ DC = CanonicalizeDC(DC);
+ if (DC->isTranslationUnit()) {
+ return SourceTU;
+ }
+ Source<const DeclContext *> SourceParentDC =
+ LookupSameContext(SourceTU, DC->getParent(), ReverseImporter);
+ if (!SourceParentDC) {
+ // If we couldn't find the parent DC in this TranslationUnit, give up.
+ return nullptr;
+ }
+ auto *ND = cast<NamedDecl>(DC);
+ DeclarationName Name = ND->getDeclName();
+ auto SourceNameOrErr = ReverseImporter.Import(Name);
+ if (!SourceNameOrErr) {
+ llvm::consumeError(SourceNameOrErr.takeError());
+ return nullptr;
+ }
+ Source<DeclarationName> SourceName = *SourceNameOrErr;
+ DeclContext::lookup_result SearchResult =
+ SourceParentDC.get()->lookup(SourceName.get());
+ size_t SearchResultSize = SearchResult.size();
+ if (SearchResultSize == 0 || SearchResultSize > 1) {
+ // There are two cases here. First, we might not find the name.
+ // We might also find multiple copies, in which case we have no
+ // guarantee that the one we wanted is the one we pick. (E.g.,
+ // if we have two specializations of the same template it is
+ // very hard to determine which is the one you want.)
+ //
+ // The Origins map fixes this problem by allowing the origin to be
+ // explicitly recorded, so we trigger that recording by returning
+ // nothing (rather than a possibly-inaccurate guess) here.
+ return nullptr;
+ } else {
+ NamedDecl *SearchResultDecl = SearchResult[0];
+ if (isa<DeclContext>(SearchResultDecl) &&
+ SearchResultDecl->getKind() == DC->getDeclKind())
+ return cast<DeclContext>(SearchResultDecl)->getPrimaryContext();
+ return nullptr; // This type of lookup is unsupported
+ }
+}
+
+/// A custom implementation of ASTImporter, for ExternalASTMerger's purposes.
+///
+/// There are several modifications:
+///
+/// - It enables lazy lookup (via the HasExternalLexicalStorage flag and a few
+/// others), which instructs Clang to refer to ExternalASTMerger. Also, it
+/// forces MinimalImport to true, which is necessary to make this work.
+/// - It maintains a reverse importer for use with names. This allows lookup of
+/// arbitrary names in the source context.
+/// - It updates the ExternalASTMerger's origin map as needed whenever a
+/// it sees a DeclContext.
+class LazyASTImporter : public ASTImporter {
+private:
+ ExternalASTMerger &Parent;
+ ASTImporter Reverse;
+ const ExternalASTMerger::OriginMap &FromOrigins;
+ /// @see ExternalASTMerger::ImporterSource::Temporary
+ bool TemporarySource;
+ /// Map of imported declarations back to the declarations they originated
+ /// from.
+ llvm::DenseMap<Decl *, Decl *> ToOrigin;
+ /// @see ExternalASTMerger::ImporterSource::Merger
+ ExternalASTMerger *SourceMerger;
+ llvm::raw_ostream &logs() { return Parent.logs(); }
+public:
+ LazyASTImporter(ExternalASTMerger &_Parent, ASTContext &ToContext,
+ FileManager &ToFileManager,
+ const ExternalASTMerger::ImporterSource &S,
+ std::shared_ptr<ASTImporterSharedState> SharedState)
+ : ASTImporter(ToContext, ToFileManager, S.getASTContext(),
+ S.getFileManager(),
+ /*MinimalImport=*/true, SharedState),
+ Parent(_Parent),
+ Reverse(S.getASTContext(), S.getFileManager(), ToContext, ToFileManager,
+ /*MinimalImport=*/true),
+ FromOrigins(S.getOriginMap()), TemporarySource(S.isTemporary()),
+ SourceMerger(S.getMerger()) {}
+
+ llvm::Expected<Decl *> ImportImpl(Decl *FromD) override {
+ if (!TemporarySource || !SourceMerger)
+ return ASTImporter::ImportImpl(FromD);
+
+ // If we get here, then this source is importing from a temporary ASTContext
+ // that also has another ExternalASTMerger attached. It could be
+ // possible that the current ExternalASTMerger and the temporary ASTContext
+ // share a common ImporterSource, which means that the temporary
+ // AST could contain declarations that were imported from a source
+ // that this ExternalASTMerger can access directly. Instead of importing
+ // such declarations from the temporary ASTContext, they should instead
+ // be directly imported by this ExternalASTMerger from the original
+ // source. This way the ExternalASTMerger can safely do a minimal import
+ // without creating incomplete declarations originated from a temporary
+ // ASTContext. If we would try to complete such declarations later on, we
+ // would fail to do so as their temporary AST could be deleted (which means
+ // that the missing parts of the minimally imported declaration in that
+ // ASTContext were also deleted).
+ //
+ // The following code tracks back any declaration that needs to be
+ // imported from the temporary ASTContext to a persistent ASTContext.
+ // Then the ExternalASTMerger tries to import from the persistent
+ // ASTContext directly by using the associated ASTImporter. If that
+ // succeeds, this ASTImporter just maps the declarations imported by
+ // the other (persistent) ASTImporter to this (temporary) ASTImporter.
+ // The steps can be visualized like this:
+ //
+ // Target AST <--- 3. Indirect import --- Persistent AST
+ // ^ of persistent decl ^
+ // | |
+ // 1. Current import 2. Tracking back to persistent decl
+ // 4. Map persistent decl |
+ // & pretend we imported. |
+ // | |
+ // Temporary AST -------------------------------'
+
+ // First, ask the ExternalASTMerger of the source where the temporary
+ // declaration originated from.
+ Decl *Persistent = SourceMerger->FindOriginalDecl(FromD);
+ // FromD isn't from a persistent AST, so just do a normal import.
+ if (!Persistent)
+ return ASTImporter::ImportImpl(FromD);
+ // Now ask the current ExternalASTMerger to try import the persistent
+ // declaration into the target.
+ ASTContext &PersistentCtx = Persistent->getASTContext();
+ ASTImporter &OtherImporter = Parent.ImporterForOrigin(PersistentCtx);
+ // Check that we never end up in the current Importer again.
+ assert((&PersistentCtx != &getFromContext()) && (&OtherImporter != this) &&
+ "Delegated to same Importer?");
+ auto DeclOrErr = OtherImporter.Import(Persistent);
+ // Errors when importing the persistent decl are treated as if we
+ // had errors with importing the temporary decl.
+ if (!DeclOrErr)
+ return DeclOrErr.takeError();
+ Decl *D = *DeclOrErr;
+ // Tell the current ASTImporter that this has already been imported
+ // to prevent any further queries for the temporary decl.
+ MapImported(FromD, D);
+ return D;
+ }
+
+ /// Implements the ASTImporter interface for tracking back a declaration
+ /// to its original declaration it came from.
+ Decl *GetOriginalDecl(Decl *To) override {
+ auto It = ToOrigin.find(To);
+ if (It != ToOrigin.end())
+ return It->second;
+ return nullptr;
+ }
+
+ /// Whenever a DeclContext is imported, ensure that ExternalASTSource's origin
+ /// map is kept up to date. Also set the appropriate flags.
+ void Imported(Decl *From, Decl *To) override {
+ ToOrigin[To] = From;
+
+ if (auto *ToDC = dyn_cast<DeclContext>(To)) {
+ const bool LoggingEnabled = Parent.LoggingEnabled();
+ if (LoggingEnabled)
+ logs() << "(ExternalASTMerger*)" << (void*)&Parent
+ << " imported (DeclContext*)" << (void*)ToDC
+ << ", (ASTContext*)" << (void*)&getToContext()
+ << " from (DeclContext*)" << (void*)llvm::cast<DeclContext>(From)
+ << ", (ASTContext*)" << (void*)&getFromContext()
+ << "\n";
+ Source<DeclContext *> FromDC(
+ cast<DeclContext>(From)->getPrimaryContext());
+ if (FromOrigins.count(FromDC) &&
+ Parent.HasImporterForOrigin(*FromOrigins.at(FromDC).AST)) {
+ if (LoggingEnabled)
+ logs() << "(ExternalASTMerger*)" << (void*)&Parent
+ << " forced origin (DeclContext*)"
+ << (void*)FromOrigins.at(FromDC).DC
+ << ", (ASTContext*)"
+ << (void*)FromOrigins.at(FromDC).AST
+ << "\n";
+ Parent.ForceRecordOrigin(ToDC, FromOrigins.at(FromDC));
+ } else {
+ if (LoggingEnabled)
+ logs() << "(ExternalASTMerger*)" << (void*)&Parent
+ << " maybe recording origin (DeclContext*)" << (void*)FromDC
+ << ", (ASTContext*)" << (void*)&getFromContext()
+ << "\n";
+ Parent.MaybeRecordOrigin(ToDC, {FromDC, &getFromContext()});
+ }
+ }
+ if (auto *ToTag = dyn_cast<TagDecl>(To)) {
+ ToTag->setHasExternalLexicalStorage();
+ ToTag->getPrimaryContext()->setMustBuildLookupTable();
+ assert(Parent.CanComplete(ToTag));
+ } else if (auto *ToNamespace = dyn_cast<NamespaceDecl>(To)) {
+ ToNamespace->setHasExternalVisibleStorage();
+ assert(Parent.CanComplete(ToNamespace));
+ } else if (auto *ToContainer = dyn_cast<ObjCContainerDecl>(To)) {
+ ToContainer->setHasExternalLexicalStorage();
+ ToContainer->getPrimaryContext()->setMustBuildLookupTable();
+ assert(Parent.CanComplete(ToContainer));
+ }
+ }
+ ASTImporter &GetReverse() { return Reverse; }
+};
+
+bool HasDeclOfSameType(llvm::ArrayRef<Candidate> Decls, const Candidate &C) {
+ if (isa<FunctionDecl>(C.first.get()))
+ return false;
+ return llvm::any_of(Decls, [&](const Candidate &D) {
+ return C.first.get()->getKind() == D.first.get()->getKind();
+ });
+}
+
+} // end namespace
+
+ASTImporter &ExternalASTMerger::ImporterForOrigin(ASTContext &OriginContext) {
+ for (const std::unique_ptr<ASTImporter> &I : Importers)
+ if (&I->getFromContext() == &OriginContext)
+ return *I;
+ llvm_unreachable("We should have an importer for this origin!");
+}
+
+namespace {
+LazyASTImporter &LazyImporterForOrigin(ExternalASTMerger &Merger,
+ ASTContext &OriginContext) {
+ return static_cast<LazyASTImporter &>(
+ Merger.ImporterForOrigin(OriginContext));
+}
+}
+
+bool ExternalASTMerger::HasImporterForOrigin(ASTContext &OriginContext) {
+ for (const std::unique_ptr<ASTImporter> &I : Importers)
+ if (&I->getFromContext() == &OriginContext)
+ return true;
+ return false;
+}
+
+template <typename CallbackType>
+void ExternalASTMerger::ForEachMatchingDC(const DeclContext *DC,
+ CallbackType Callback) {
+ if (Origins.count(DC)) {
+ ExternalASTMerger::DCOrigin Origin = Origins[DC];
+ LazyASTImporter &Importer = LazyImporterForOrigin(*this, *Origin.AST);
+ Callback(Importer, Importer.GetReverse(), Origin.DC);
+ } else {
+ bool DidCallback = false;
+ for (const std::unique_ptr<ASTImporter> &Importer : Importers) {
+ Source<TranslationUnitDecl *> SourceTU =
+ Importer->getFromContext().getTranslationUnitDecl();
+ ASTImporter &Reverse =
+ static_cast<LazyASTImporter *>(Importer.get())->GetReverse();
+ if (auto SourceDC = LookupSameContext(SourceTU, DC, Reverse)) {
+ DidCallback = true;
+ if (Callback(*Importer, Reverse, SourceDC))
+ break;
+ }
+ }
+ if (!DidCallback && LoggingEnabled())
+ logs() << "(ExternalASTMerger*)" << (void*)this
+ << " asserting for (DeclContext*)" << (const void*)DC
+ << ", (ASTContext*)" << (void*)&Target.AST
+ << "\n";
+ assert(DidCallback && "Couldn't find a source context matching our DC");
+ }
+}
+
+void ExternalASTMerger::CompleteType(TagDecl *Tag) {
+ assert(Tag->hasExternalLexicalStorage());
+ ForEachMatchingDC(Tag, [&](ASTImporter &Forward, ASTImporter &Reverse,
+ Source<const DeclContext *> SourceDC) -> bool {
+ auto *SourceTag = const_cast<TagDecl *>(cast<TagDecl>(SourceDC.get()));
+ if (SourceTag->hasExternalLexicalStorage())
+ SourceTag->getASTContext().getExternalSource()->CompleteType(SourceTag);
+ if (!SourceTag->getDefinition())
+ return false;
+ Forward.MapImported(SourceTag, Tag);
+ if (llvm::Error Err = Forward.ImportDefinition(SourceTag))
+ llvm::consumeError(std::move(Err));
+ Tag->setCompleteDefinition(SourceTag->isCompleteDefinition());
+ return true;
+ });
+}
+
+void ExternalASTMerger::CompleteType(ObjCInterfaceDecl *Interface) {
+ assert(Interface->hasExternalLexicalStorage());
+ ForEachMatchingDC(
+ Interface, [&](ASTImporter &Forward, ASTImporter &Reverse,
+ Source<const DeclContext *> SourceDC) -> bool {
+ auto *SourceInterface = const_cast<ObjCInterfaceDecl *>(
+ cast<ObjCInterfaceDecl>(SourceDC.get()));
+ if (SourceInterface->hasExternalLexicalStorage())
+ SourceInterface->getASTContext().getExternalSource()->CompleteType(
+ SourceInterface);
+ if (!SourceInterface->getDefinition())
+ return false;
+ Forward.MapImported(SourceInterface, Interface);
+ if (llvm::Error Err = Forward.ImportDefinition(SourceInterface))
+ llvm::consumeError(std::move(Err));
+ return true;
+ });
+}
+
+bool ExternalASTMerger::CanComplete(DeclContext *Interface) {
+ assert(Interface->hasExternalLexicalStorage() ||
+ Interface->hasExternalVisibleStorage());
+ bool FoundMatchingDC = false;
+ ForEachMatchingDC(Interface,
+ [&](ASTImporter &Forward, ASTImporter &Reverse,
+ Source<const DeclContext *> SourceDC) -> bool {
+ FoundMatchingDC = true;
+ return true;
+ });
+ return FoundMatchingDC;
+}
+
+namespace {
+bool IsSameDC(const DeclContext *D1, const DeclContext *D2) {
+ if (isa<ObjCContainerDecl>(D1) && isa<ObjCContainerDecl>(D2))
+ return true; // There are many cases where Objective-C is ambiguous.
+ if (auto *T1 = dyn_cast<TagDecl>(D1))
+ if (auto *T2 = dyn_cast<TagDecl>(D2))
+ if (T1->getFirstDecl() == T2->getFirstDecl())
+ return true;
+ return D1 == D2 || D1 == CanonicalizeDC(D2);
+}
+}
+
+void ExternalASTMerger::MaybeRecordOrigin(const DeclContext *ToDC,
+ DCOrigin Origin) {
+ LazyASTImporter &Importer = LazyImporterForOrigin(*this, *Origin.AST);
+ ASTImporter &Reverse = Importer.GetReverse();
+ Source<const DeclContext *> FoundFromDC =
+ LookupSameContext(Origin.AST->getTranslationUnitDecl(), ToDC, Reverse);
+ const bool DoRecord = !FoundFromDC || !IsSameDC(FoundFromDC.get(), Origin.DC);
+ if (DoRecord)
+ RecordOriginImpl(ToDC, Origin, Importer);
+ if (LoggingEnabled())
+ logs() << "(ExternalASTMerger*)" << (void*)this
+ << (DoRecord ? " decided " : " decided NOT")
+ << " to record origin (DeclContext*)" << (void*)Origin.DC
+ << ", (ASTContext*)" << (void*)&Origin.AST
+ << "\n";
+}
+
+void ExternalASTMerger::ForceRecordOrigin(const DeclContext *ToDC,
+ DCOrigin Origin) {
+ RecordOriginImpl(ToDC, Origin, ImporterForOrigin(*Origin.AST));
+}
+
+void ExternalASTMerger::RecordOriginImpl(const DeclContext *ToDC, DCOrigin Origin,
+ ASTImporter &Importer) {
+ Origins[ToDC] = Origin;
+ Importer.ASTImporter::MapImported(cast<Decl>(Origin.DC), const_cast<Decl*>(cast<Decl>(ToDC)));
+}
+
+ExternalASTMerger::ExternalASTMerger(const ImporterTarget &Target,
+ llvm::ArrayRef<ImporterSource> Sources) : LogStream(&llvm::nulls()), Target(Target) {
+ SharedState = std::make_shared<ASTImporterSharedState>(
+ *Target.AST.getTranslationUnitDecl());
+ AddSources(Sources);
+}
+
+Decl *ExternalASTMerger::FindOriginalDecl(Decl *D) {
+ assert(&D->getASTContext() == &Target.AST);
+ for (const auto &I : Importers)
+ if (auto Result = I->GetOriginalDecl(D))
+ return Result;
+ return nullptr;
+}
+
+void ExternalASTMerger::AddSources(llvm::ArrayRef<ImporterSource> Sources) {
+ for (const ImporterSource &S : Sources) {
+ assert(&S.getASTContext() != &Target.AST);
+ // Check that the associated merger actually imports into the source AST.
+ assert(!S.getMerger() || &S.getMerger()->Target.AST == &S.getASTContext());
+ Importers.push_back(std::make_unique<LazyASTImporter>(
+ *this, Target.AST, Target.FM, S, SharedState));
+ }
+}
+
+void ExternalASTMerger::RemoveSources(llvm::ArrayRef<ImporterSource> Sources) {
+ if (LoggingEnabled())
+ for (const ImporterSource &S : Sources)
+ logs() << "(ExternalASTMerger*)" << (void *)this
+ << " removing source (ASTContext*)" << (void *)&S.getASTContext()
+ << "\n";
+ Importers.erase(
+ std::remove_if(Importers.begin(), Importers.end(),
+ [&Sources](std::unique_ptr<ASTImporter> &Importer) -> bool {
+ for (const ImporterSource &S : Sources) {
+ if (&Importer->getFromContext() == &S.getASTContext())
+ return true;
+ }
+ return false;
+ }),
+ Importers.end());
+ for (OriginMap::iterator OI = Origins.begin(), OE = Origins.end(); OI != OE; ) {
+ std::pair<const DeclContext *, DCOrigin> Origin = *OI;
+ bool Erase = false;
+ for (const ImporterSource &S : Sources) {
+ if (&S.getASTContext() == Origin.second.AST) {
+ Erase = true;
+ break;
+ }
+ }
+ if (Erase)
+ OI = Origins.erase(OI);
+ else
+ ++OI;
+ }
+}
+
+template <typename DeclTy>
+static bool importSpecializations(DeclTy *D, ASTImporter *Importer) {
+ for (auto *Spec : D->specializations()) {
+ auto ImportedSpecOrError = Importer->Import(Spec);
+ if (!ImportedSpecOrError) {
+ llvm::consumeError(ImportedSpecOrError.takeError());
+ return true;
+ }
+ }
+ return false;
+}
+
+/// Imports specializations from template declarations that can be specialized.
+static bool importSpecializationsIfNeeded(Decl *D, ASTImporter *Importer) {
+ if (!isa<TemplateDecl>(D))
+ return false;
+ if (auto *FunctionTD = dyn_cast<FunctionTemplateDecl>(D))
+ return importSpecializations(FunctionTD, Importer);
+ else if (auto *ClassTD = dyn_cast<ClassTemplateDecl>(D))
+ return importSpecializations(ClassTD, Importer);
+ else if (auto *VarTD = dyn_cast<VarTemplateDecl>(D))
+ return importSpecializations(VarTD, Importer);
+ return false;
+}
+
+bool ExternalASTMerger::FindExternalVisibleDeclsByName(const DeclContext *DC,
+ DeclarationName Name) {
+ llvm::SmallVector<NamedDecl *, 1> Decls;
+ llvm::SmallVector<Candidate, 4> Candidates;
+
+ auto FilterFoundDecl = [&Candidates](const Candidate &C) {
+ if (!HasDeclOfSameType(Candidates, C))
+ Candidates.push_back(C);
+ };
+
+ ForEachMatchingDC(DC,
+ [&](ASTImporter &Forward, ASTImporter &Reverse,
+ Source<const DeclContext *> SourceDC) -> bool {
+ auto FromNameOrErr = Reverse.Import(Name);
+ if (!FromNameOrErr) {
+ llvm::consumeError(FromNameOrErr.takeError());
+ return false;
+ }
+ DeclContextLookupResult Result =
+ SourceDC.get()->lookup(*FromNameOrErr);
+ for (NamedDecl *FromD : Result) {
+ FilterFoundDecl(std::make_pair(FromD, &Forward));
+ }
+ return false;
+ });
+
+ if (Candidates.empty())
+ return false;
+
+ Decls.reserve(Candidates.size());
+ for (const Candidate &C : Candidates) {
+ Decl *LookupRes = C.first.get();
+ ASTImporter *Importer = C.second;
+ auto NDOrErr = Importer->Import(LookupRes);
+ assert(NDOrErr);
+ (void)static_cast<bool>(NDOrErr);
+ NamedDecl *ND = cast_or_null<NamedDecl>(*NDOrErr);
+ assert(ND);
+ // If we don't import specialization, they are not available via lookup
+ // because the lookup result is imported TemplateDecl and it does not
+ // reference its specializations until they are imported explicitly.
+ bool IsSpecImportFailed =
+ importSpecializationsIfNeeded(LookupRes, Importer);
+ assert(!IsSpecImportFailed);
+ (void)IsSpecImportFailed;
+ Decls.push_back(ND);
+ }
+ SetExternalVisibleDeclsForName(DC, Name, Decls);
+ return true;
+}
+
+void ExternalASTMerger::FindExternalLexicalDecls(
+ const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
+ SmallVectorImpl<Decl *> &Result) {
+ ForEachMatchingDC(DC, [&](ASTImporter &Forward, ASTImporter &Reverse,
+ Source<const DeclContext *> SourceDC) -> bool {
+ for (const Decl *SourceDecl : SourceDC.get()->decls()) {
+ if (IsKindWeWant(SourceDecl->getKind())) {
+ auto ImportedDeclOrErr = Forward.Import(SourceDecl);
+ if (ImportedDeclOrErr)
+ assert(!(*ImportedDeclOrErr) ||
+ IsSameDC((*ImportedDeclOrErr)->getDeclContext(), DC));
+ else
+ llvm::consumeError(ImportedDeclOrErr.takeError());
+ }
+ }
+ return false;
+ });
+}
+
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