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#include "IndexAction.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Index/IndexDataConsumer.h"
#include "clang/Index/IndexingAction.h"
#include "clang/Tooling/Tooling.h"
namespace clang {
namespace clangd {
namespace {
llvm::Optional<std::string> toURI(const FileEntry *File) {
if (!File)
return llvm::None;
auto AbsolutePath = File->tryGetRealPathName();
if (AbsolutePath.empty())
return llvm::None;
return URI::create(AbsolutePath).toString();
}
// Collects the nodes and edges of include graph during indexing action.
// Important: The graph generated by those callbacks might contain cycles and
// self edges.
struct IncludeGraphCollector : public PPCallbacks {
public:
IncludeGraphCollector(const SourceManager &SM, IncludeGraph &IG)
: SM(SM), IG(IG) {}
// Populates everything except direct includes for a node, which represents
// edges in the include graph and populated in inclusion directive.
// We cannot populate the fields in InclusionDirective because it does not
// have access to the contents of the included file.
void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType,
FileID PrevFID) override {
// We only need to process each file once. So we don't care about anything
// but entries.
if (Reason != FileChangeReason::EnterFile)
return;
const auto FileID = SM.getFileID(Loc);
const auto File = SM.getFileEntryForID(FileID);
auto URI = toURI(File);
if (!URI)
return;
auto I = IG.try_emplace(*URI).first;
auto &Node = I->getValue();
// Node has already been populated.
if (Node.URI.data() == I->getKeyData()) {
#ifndef NDEBUG
auto Digest = digestFile(SM, FileID);
assert(Digest && Node.Digest == *Digest &&
"Same file, different digest?");
#endif
return;
}
if (auto Digest = digestFile(SM, FileID))
Node.Digest = std::move(*Digest);
Node.IsTU = FileID == SM.getMainFileID();
Node.URI = I->getKey();
}
// Add edges from including files to includes.
void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
llvm::StringRef FileName, bool IsAngled,
CharSourceRange FilenameRange, const FileEntry *File,
llvm::StringRef SearchPath,
llvm::StringRef RelativePath, const Module *Imported,
SrcMgr::CharacteristicKind FileType) override {
auto IncludeURI = toURI(File);
if (!IncludeURI)
return;
auto IncludingURI = toURI(SM.getFileEntryForID(SM.getFileID(HashLoc)));
if (!IncludingURI)
return;
auto NodeForInclude = IG.try_emplace(*IncludeURI).first->getKey();
auto NodeForIncluding = IG.try_emplace(*IncludingURI);
NodeForIncluding.first->getValue().DirectIncludes.push_back(NodeForInclude);
}
// Sanity check to ensure we have already populated a skipped file.
void FileSkipped(const FileEntry &SkippedFile, const Token &FilenameTok,
SrcMgr::CharacteristicKind FileType) override {
#ifndef NDEBUG
auto URI = toURI(&SkippedFile);
if (!URI)
return;
auto I = IG.try_emplace(*URI);
assert(!I.second && "File inserted for the first time on skip.");
assert(I.first->getKeyData() == I.first->getValue().URI.data() &&
"Node have not been populated yet");
#endif
}
private:
const SourceManager &SM;
IncludeGraph &IG;
};
// Wraps the index action and reports index data after each translation unit.
class IndexAction : public WrapperFrontendAction {
public:
IndexAction(std::shared_ptr<SymbolCollector> C,
std::unique_ptr<CanonicalIncludes> Includes,
const index::IndexingOptions &Opts,
std::function<void(SymbolSlab)> SymbolsCallback,
std::function<void(RefSlab)> RefsCallback,
std::function<void(IncludeGraph)> IncludeGraphCallback)
: WrapperFrontendAction(index::createIndexingAction(C, Opts, nullptr)),
SymbolsCallback(SymbolsCallback), RefsCallback(RefsCallback),
IncludeGraphCallback(IncludeGraphCallback), Collector(C),
Includes(std::move(Includes)),
PragmaHandler(collectIWYUHeaderMaps(this->Includes.get())) {}
std::unique_ptr<ASTConsumer>
CreateASTConsumer(CompilerInstance &CI, llvm::StringRef InFile) override {
CI.getPreprocessor().addCommentHandler(PragmaHandler.get());
if (IncludeGraphCallback != nullptr)
CI.getPreprocessor().addPPCallbacks(
llvm::make_unique<IncludeGraphCollector>(CI.getSourceManager(), IG));
return WrapperFrontendAction::CreateASTConsumer(CI, InFile);
}
bool BeginInvocation(CompilerInstance &CI) override {
// We want all comments, not just the doxygen ones.
CI.getLangOpts().CommentOpts.ParseAllComments = true;
return WrapperFrontendAction::BeginInvocation(CI);
}
void EndSourceFileAction() override {
WrapperFrontendAction::EndSourceFileAction();
const auto &CI = getCompilerInstance();
if (CI.hasDiagnostics() &&
CI.getDiagnostics().hasUncompilableErrorOccurred()) {
llvm::errs() << "Skipping TU due to uncompilable errors\n";
return;
}
SymbolsCallback(Collector->takeSymbols());
if (RefsCallback != nullptr)
RefsCallback(Collector->takeRefs());
if (IncludeGraphCallback != nullptr) {
#ifndef NDEBUG
// This checks if all nodes are initialized.
for (const auto &Node : IG)
assert(Node.getKeyData() == Node.getValue().URI.data());
#endif
IncludeGraphCallback(std::move(IG));
}
}
private:
std::function<void(SymbolSlab)> SymbolsCallback;
std::function<void(RefSlab)> RefsCallback;
std::function<void(IncludeGraph)> IncludeGraphCallback;
std::shared_ptr<SymbolCollector> Collector;
std::unique_ptr<CanonicalIncludes> Includes;
std::unique_ptr<CommentHandler> PragmaHandler;
IncludeGraph IG;
};
} // namespace
std::unique_ptr<FrontendAction> createStaticIndexingAction(
SymbolCollector::Options Opts,
std::function<void(SymbolSlab)> SymbolsCallback,
std::function<void(RefSlab)> RefsCallback,
std::function<void(IncludeGraph)> IncludeGraphCallback) {
index::IndexingOptions IndexOpts;
IndexOpts.SystemSymbolFilter =
index::IndexingOptions::SystemSymbolFilterKind::All;
Opts.CollectIncludePath = true;
Opts.CountReferences = true;
Opts.Origin = SymbolOrigin::Static;
if (RefsCallback != nullptr) {
Opts.RefFilter = RefKind::All;
Opts.RefsInHeaders = true;
}
auto Includes = llvm::make_unique<CanonicalIncludes>();
addSystemHeadersMapping(Includes.get());
Opts.Includes = Includes.get();
return llvm::make_unique<IndexAction>(
std::make_shared<SymbolCollector>(std::move(Opts)), std::move(Includes),
IndexOpts, SymbolsCallback, RefsCallback, IncludeGraphCallback);
}
} // namespace clangd
} // namespace clang
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