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