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//===- ExternalASTMerger.cpp - Merging External AST Interface ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/DeclObjC.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;
class LazyASTImporter : public ASTImporter {
public:
LazyASTImporter(ASTContext &ToContext, FileManager &ToFileManager,
ASTContext &FromContext, FileManager &FromFileManager)
: ASTImporter(ToContext, ToFileManager, FromContext, FromFileManager,
/*MinimalImport=*/true) {}
Decl *Imported(Decl *From, Decl *To) override {
if (auto ToTag = dyn_cast<TagDecl>(To)) {
ToTag->setHasExternalLexicalStorage();
ToTag->setMustBuildLookupTable();
} else if (auto ToNamespace = dyn_cast<NamespaceDecl>(To)) {
ToNamespace->setHasExternalVisibleStorage();
}
return ASTImporter::Imported(From, To);
}
};
Source<const DeclContext *>
LookupSameContext(Source<TranslationUnitDecl *> SourceTU, const DeclContext *DC,
ASTImporter &ReverseImporter) {
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();
Source<DeclarationName> SourceName = ReverseImporter.Import(Name);
DeclContext::lookup_result SearchResult =
SourceParentDC.get()->lookup(SourceName.get());
size_t SearchResultSize = SearchResult.size();
// Handle multiple candidates once we have a test for it.
// This may turn up when we import template specializations correctly.
assert(SearchResultSize < 2);
if (SearchResultSize == 0) {
// couldn't find the name, so we have to give up
return nullptr;
} else {
NamedDecl *SearchResultDecl = SearchResult[0];
return dyn_cast<DeclContext>(SearchResultDecl);
}
}
bool IsForwardDeclaration(Decl *D) {
assert(!isa<ObjCInterfaceDecl>(D)); // TODO handle this case
if (auto TD = dyn_cast<TagDecl>(D)) {
return !TD->isThisDeclarationADefinition();
} else if (auto FD = dyn_cast<FunctionDecl>(D)) {
return !FD->isThisDeclarationADefinition();
} else {
return false;
}
}
template <typename CallbackType>
void ForEachMatchingDC(
const DeclContext *DC,
llvm::ArrayRef<ExternalASTMerger::ImporterPair> Importers,
CallbackType Callback) {
for (const ExternalASTMerger::ImporterPair &IP : Importers) {
Source<TranslationUnitDecl *> SourceTU =
IP.Forward->getFromContext().getTranslationUnitDecl();
if (auto SourceDC = LookupSameContext(SourceTU, DC, *IP.Reverse))
Callback(IP, SourceDC);
}
}
bool HasDeclOfSameType(llvm::ArrayRef<Candidate> Decls, const Candidate &C) {
return llvm::any_of(Decls, [&](const Candidate &D) {
return C.first.get()->getKind() == D.first.get()->getKind();
});
}
} // end namespace
ExternalASTMerger::ExternalASTMerger(const ImporterEndpoint &Target,
llvm::ArrayRef<ImporterEndpoint> Sources) {
for (const ImporterEndpoint &S : Sources) {
Importers.push_back(
{llvm::make_unique<LazyASTImporter>(Target.AST, Target.FM, S.AST, S.FM),
llvm::make_unique<ASTImporter>(S.AST, S.FM, Target.AST, Target.FM,
/*MinimalImport=*/true)});
}
}
bool ExternalASTMerger::FindExternalVisibleDeclsByName(const DeclContext *DC,
DeclarationName Name) {
llvm::SmallVector<NamedDecl *, 1> Decls;
llvm::SmallVector<Candidate, 4> CompleteDecls;
llvm::SmallVector<Candidate, 4> ForwardDecls;
auto FilterFoundDecl = [&CompleteDecls, &ForwardDecls](const Candidate &C) {
if (IsForwardDeclaration(C.first.get())) {
if (!HasDeclOfSameType(ForwardDecls, C)) {
ForwardDecls.push_back(C);
}
} else {
CompleteDecls.push_back(C);
}
};
ForEachMatchingDC(
DC, Importers,
[&](const ImporterPair &IP, Source<const DeclContext *> SourceDC) {
DeclarationName FromName = IP.Reverse->Import(Name);
DeclContextLookupResult Result = SourceDC.get()->lookup(FromName);
for (NamedDecl *FromD : Result) {
FilterFoundDecl(std::make_pair(FromD, IP.Forward.get()));
}
});
llvm::ArrayRef<Candidate> DeclsToReport =
CompleteDecls.empty() ? ForwardDecls : CompleteDecls;
if (DeclsToReport.empty()) {
return false;
}
Decls.reserve(DeclsToReport.size());
for (const Candidate &C : DeclsToReport) {
NamedDecl *d = cast<NamedDecl>(C.second->Import(C.first.get()));
assert(d);
Decls.push_back(d);
}
SetExternalVisibleDeclsForName(DC, Name, Decls);
return true;
}
void ExternalASTMerger::FindExternalLexicalDecls(
const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
SmallVectorImpl<Decl *> &Result) {
ForEachMatchingDC(
DC, Importers,
[&](const ImporterPair &IP, Source<const DeclContext *> SourceDC) {
for (const Decl *SourceDecl : SourceDC.get()->decls()) {
if (IsKindWeWant(SourceDecl->getKind())) {
Decl *ImportedDecl =
IP.Forward->Import(const_cast<Decl *>(SourceDecl));
assert(ImportedDecl->getDeclContext() == DC);
(void)ImportedDecl;
}
}
});
}
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