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Revert "Introduce shard storage to auto-index." 

This reverts commit 6dd1f24aead10a8d375d0311001987198d26e900.

llvm-svn: 346945
This commit is contained in:
Kadir Cetinkaya 2018-11-15 10:34:47 +00:00
parent bd2441c887
commit 5a9b92ca75
3 changed files with 25 additions and 233 deletions
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144
clang-tools-extra/clangd/index/Background.cpp
View File

@ -26,52 +26,26 @@
#include "llvm/Support/SHA1.h"
#include <random>
#include <string>
#include <queue>
#include <memory>
using namespace llvm;
namespace clang {
namespace clangd {
namespace {
static BackgroundIndex::FileDigest digest(StringRef Content) {
return SHA1::hash({(const uint8_t *)Content.data(), Content.size()});
}
static Optional<BackgroundIndex::FileDigest> digestFile(const SourceManager &SM,
FileID FID) {
bool Invalid = false;
StringRef Content = SM.getBufferData(FID, &Invalid);
if (Invalid)
return None;
return digest(Content);
}
llvm::SmallString<128>
getShardPathFromFilePath(llvm::SmallString<128> ShardRoot,
llvm::StringRef FilePath) {
sys::path::append(ShardRoot, sys::path::filename(FilePath) +
toHex(digest(FilePath)) + ".idx");
return ShardRoot;
}
} // namespace
BackgroundIndex::BackgroundIndex(
Context BackgroundContext, StringRef ResourceDir,
const FileSystemProvider &FSProvider, ArrayRef<std::string> URISchemes,
std::unique_ptr<ShardStorage> IndexShardStorage, size_t ThreadPoolSize)
BackgroundIndex::BackgroundIndex(Context BackgroundContext,
StringRef ResourceDir,
const FileSystemProvider &FSProvider,
ArrayRef<std::string> URISchemes,
size_t ThreadPoolSize)
: SwapIndex(make_unique<MemIndex>()), ResourceDir(ResourceDir),
FSProvider(FSProvider), BackgroundContext(std::move(BackgroundContext)),
URISchemes(URISchemes), IndexShardStorage(std::move(IndexShardStorage)) {
URISchemes(URISchemes) {
assert(ThreadPoolSize > 0 && "Thread pool size can't be zero.");
while (ThreadPoolSize--) {
ThreadPool.emplace_back([this] { run(); });
// Set priority to low, since background indexing is a long running task we
// do not want to eat up cpu when there are any other high priority threads.
// FIXME: In the future we might want a more general way of handling this to
// support tasks with various priorities.
// support a tasks with various priorities.
setThreadPriority(ThreadPool.back(), ThreadPriority::Low);
}
}
@ -149,12 +123,6 @@ void BackgroundIndex::enqueueAll(StringRef Directory,
}
void BackgroundIndex::enqueueLocked(tooling::CompileCommand Cmd) {
// Initialize storage to project root. Since Initialize is no-op for multiple
// calls we can simply call it for each file.
if (IndexShardStorage && !IndexShardStorage->initialize(Cmd.Directory)) {
elog("Failed to initialize shard storage");
IndexShardStorage.reset();
}
Queue.push_back(Bind(
[this](tooling::CompileCommand Cmd) {
std::string Filename = Cmd.Filename;
@ -165,6 +133,19 @@ void BackgroundIndex::enqueueLocked(tooling::CompileCommand Cmd) {
std::move(Cmd)));
}
static BackgroundIndex::FileDigest digest(StringRef Content) {
return SHA1::hash({(const uint8_t *)Content.data(), Content.size()});
}
static Optional<BackgroundIndex::FileDigest> digestFile(const SourceManager &SM,
FileID FID) {
bool Invalid = false;
StringRef Content = SM.getBufferData(FID, &Invalid);
if (Invalid)
return None;
return digest(Content);
}
// Resolves URI to file paths with cache.
class URIToFileCache {
public:
@ -246,25 +227,14 @@ void BackgroundIndex::update(StringRef MainFile, SymbolSlab Symbols,
for (const auto *R : F.second.Refs)
Refs.insert(RefToIDs[R], *R);
auto SS = llvm::make_unique<SymbolSlab>(std::move(Syms).build());
auto RS = llvm::make_unique<RefSlab>(std::move(Refs).build());
auto Hash = FilesToUpdate.lookup(Path);
// Put shards into storage for subsequent use.
// FIXME: Store Hash in the Shard.
if (IndexShardStorage) {
IndexFileOut Shard;
Shard.Symbols = SS.get();
Shard.Refs = RS.get();
IndexShardStorage->storeShard(Path, Shard);
}
std::lock_guard<std::mutex> Lock(DigestsMu);
// This can override a newer version that is added in another thread,
// if this thread sees the older version but finishes later. This should be
// rare in practice.
IndexedFileDigests[Path] = Hash;
IndexedSymbols.update(Path, std::move(SS), std::move(RS));
IndexedFileDigests[Path] = FilesToUpdate.lookup(Path);
IndexedSymbols.update(Path,
make_unique<SymbolSlab>(std::move(Syms).build()),
make_unique<RefSlab>(std::move(Refs).build()));
}
}
@ -323,18 +293,6 @@ Error BackgroundIndex::index(tooling::CompileCommand Cmd) {
if (IndexedFileDigests.lookup(AbsolutePath) == Hash) {
vlog("No need to index {0}, already up to date", AbsolutePath);
return Error::success();
} else if (IndexShardStorage) { // Check if shard storage has the index.
auto Shard = IndexShardStorage->retrieveShard(AbsolutePath, Hash);
if (Shard) {
// FIXME: We might still want to re-index headers.
IndexedFileDigests[AbsolutePath] = Hash;
IndexedSymbols.update(
AbsolutePath, make_unique<SymbolSlab>(std::move(*Shard->Symbols)),
make_unique<RefSlab>(std::move(*Shard->Refs)));
vlog("Loaded {0} from storage", AbsolutePath);
return Error::success();
}
}
DigestsSnapshot = IndexedFileDigests;
@ -401,59 +359,5 @@ Error BackgroundIndex::index(tooling::CompileCommand Cmd) {
return Error::success();
}
llvm::Expected<IndexFileIn>
DiskShardStorage::retrieveShard(llvm::StringRef ShardIdentifier,
FileDigest Hash) const {
assert(Initialized && "Not initialized?");
llvm::SmallString<128> ShardPath;
{
std::lock_guard<std::mutex> Lock(DiskShardRootMu);
ShardPath = getShardPathFromFilePath(DiskShardRoot, ShardIdentifier);
}
auto Buffer = MemoryBuffer::getFile(ShardPath);
if (!Buffer) {
elog("Couldn't retrieve {0}: {1}", ShardPath, Buffer.getError().message());
return llvm::make_error<llvm::StringError>(Buffer.getError());
}
// FIXME: Change readIndexFile to also look at Hash of the source that
// generated index and skip if there is a mismatch.
return readIndexFile(Buffer->get()->getBuffer());
}
bool DiskShardStorage::storeShard(llvm::StringRef ShardIdentifier,
IndexFileOut Shard) const {
assert(Initialized && "Not initialized?");
llvm::SmallString<128> ShardPath;
{
std::lock_guard<std::mutex> Lock(DiskShardRootMu);
ShardPath = getShardPathFromFilePath(DiskShardRoot, ShardIdentifier);
}
std::error_code EC;
llvm::raw_fd_ostream OS(ShardPath, EC);
if (EC) {
elog("Failed to open {0} for writing: {1}", ShardPath, EC.message());
return false;
}
OS << Shard;
return true;
}
bool DiskShardStorage::initialize(llvm::StringRef Directory) {
if (Initialized)
return true;
std::lock_guard<std::mutex> Lock(DiskShardRootMu);
DiskShardRoot = Directory;
sys::path::append(DiskShardRoot, ".clangd-index/");
if (!llvm::sys::fs::exists(DiskShardRoot)) {
std::error_code OK;
std::error_code EC = llvm::sys::fs::create_directory(DiskShardRoot);
if (EC != OK) {
elog("Failed to create {0}: {1}", DiskShardRoot, EC.message());
return Initialized = false;
}
}
return Initialized = true;
}
} // namespace clangd
} // namespace clang

40
clang-tools-extra/clangd/index/Background.h
View File

@ -14,7 +14,6 @@
#include "FSProvider.h"
#include "index/FileIndex.h"
#include "index/Index.h"
#include "index/Serialization.h"
#include "clang/Tooling/CompilationDatabase.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/SHA1.h"
@ -28,17 +27,6 @@
namespace clang {
namespace clangd {
// Base class for Shard Storage operations. See DiskShardStorage for more info.
class ShardStorage {
public:
using FileDigest = decltype(llvm::SHA1::hash({}));
virtual bool storeShard(llvm::StringRef ShardIdentifier,
IndexFileOut Shard) const = 0;
virtual llvm::Expected<IndexFileIn>
retrieveShard(llvm::StringRef ShardIdentifier, FileDigest Hash) const = 0;
virtual bool initialize(llvm::StringRef Directory) = 0;
};
// Builds an in-memory index by by running the static indexer action over
// all commands in a compilation database. Indexing happens in the background.
// FIXME: it should also persist its state on disk for fast start.
@ -46,9 +34,8 @@ public:
class BackgroundIndex : public SwapIndex {
public:
// FIXME: resource-dir injection should be hoisted somewhere common.
BackgroundIndex(Context BackgroundContext, llvm::StringRef ResourceDir,
BackgroundIndex(Context BackgroundContext, StringRef ResourceDir,
const FileSystemProvider &, ArrayRef<std::string> URISchemes,
std::unique_ptr<ShardStorage> IndexShardStorage = nullptr,
size_t ThreadPoolSize = llvm::hardware_concurrency());
~BackgroundIndex(); // Blocks while the current task finishes.
@ -79,7 +66,6 @@ private:
const FileSystemProvider &FSProvider;
Context BackgroundContext;
std::vector<std::string> URISchemes;
std::unique_ptr<ShardStorage> IndexShardStorage;
// index state
llvm::Error index(tooling::CompileCommand);
@ -100,30 +86,6 @@ private:
std::vector<std::thread> ThreadPool; // FIXME: Abstract this away.
};
// Handles storage and retrieval of index shards into disk. Requires Initialize
// to be called before storing or retrieval. Creates a directory called
// ".clangd-index/" under the path provided during initialize. This class is
// thread-safe.
class DiskShardStorage : public ShardStorage {
mutable std::mutex DiskShardRootMu;
llvm::SmallString<128> DiskShardRoot;
bool Initialized;
public:
// Retrieves the shard if found and contents are consistent with the provided
// Hash.
llvm::Expected<IndexFileIn> retrieveShard(llvm::StringRef ShardIdentifier,
FileDigest Hash) const;
// Stores given shard with name ShardIdentifier under initialized directory.
bool storeShard(llvm::StringRef ShardIdentifier, IndexFileOut Shard) const;
// Initializes DiskShardRoot to (Directory + ".clangd-index/") which is the
// base directory for all shard files. After the initialization succeeds all
// subsequent calls or no-op.
bool initialize(llvm::StringRef Directory);
};
} // namespace clangd
} // namespace clang

74
clang-tools-extra/unittests/clangd/BackgroundIndexTests.cpp
View File

@ -78,79 +78,5 @@ TEST(BackgroundIndexTest, IndexTwoFiles) {
FileURI("unittest:///root/B.cc")}));
}
TEST(BackgroundIndexTest, ShardStorageTest) {
class MemoryShardStorage : public ShardStorage {
mutable std::mutex StorageMu;
llvm::StringMap<std::string> &Storage;
size_t& CacheHits;
public:
MemoryShardStorage(llvm::StringMap<std::string> &Storage, size_t &CacheHits)
: Storage(Storage), CacheHits(CacheHits) {}
bool storeShard(llvm::StringRef ShardIdentifier, IndexFileOut Shard) const {
std::lock_guard<std::mutex> Lock(StorageMu);
std::string &str = Storage[ShardIdentifier];
llvm::raw_string_ostream OS(str);
OS << Shard;
OS.flush();
return true;
}
llvm::Expected<IndexFileIn> retrieveShard(llvm::StringRef ShardIdentifier,
FileDigest Hash) const {
std::lock_guard<std::mutex> Lock(StorageMu);
if (Storage.find(ShardIdentifier) == Storage.end())
return llvm::make_error<llvm::StringError>(
"Shard not found.", llvm::inconvertibleErrorCode());
auto IndexFile = readIndexFile(Storage[ShardIdentifier]);
if(!IndexFile)
return IndexFile;
CacheHits++;
return IndexFile;
}
bool initialize(llvm::StringRef Directory) { return true; }
};
MockFSProvider FS;
FS.Files[testPath("root/A.h")] = R"cpp(
void common();
void f_b();
class A_CC {};
)cpp";
FS.Files[testPath("root/A.cc")] =
"#include \"A.h\"\nvoid g() { (void)common; }";
llvm::StringMap<std::string> Storage;
size_t CacheHits = 0;
tooling::CompileCommand Cmd;
Cmd.Filename = testPath("root/A.cc");
Cmd.Directory = testPath("root");
Cmd.CommandLine = {"clang++", testPath("root/A.cc")};
{
BackgroundIndex Idx(
Context::empty(), "", FS, /*URISchemes=*/{"unittest"},
/*IndexShardStorage=*/
llvm::make_unique<MemoryShardStorage>(Storage, CacheHits));
Idx.enqueue(testPath("root"), Cmd);
Idx.blockUntilIdleForTest();
}
EXPECT_EQ(CacheHits, 0U);
EXPECT_EQ(Storage.size(), 2U);
EXPECT_NE(Storage.find(testPath("root/A.h")), Storage.end());
EXPECT_NE(Storage.find(testPath("root/A.cc")), Storage.end());
{
BackgroundIndex Idx(
Context::empty(), "", FS, /*URISchemes=*/{"unittest"},
/*IndexShardStorage=*/
llvm::make_unique<MemoryShardStorage>(Storage, CacheHits));
Idx.enqueue(testPath("root"), Cmd);
Idx.blockUntilIdleForTest();
}
EXPECT_EQ(CacheHits, 1U);
EXPECT_EQ(Storage.size(), 2U);
EXPECT_NE(Storage.find(testPath("root/A.h")), Storage.end());
EXPECT_NE(Storage.find(testPath("root/A.cc")), Storage.end());
// B_CC is dropped as we don't collect symbols from A.h in this compilation.
}
} // namespace clangd
} // namespace clang