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llvm-project/clang-tools-extra/clangd/tool/ClangdMain.cpp

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//===--- ClangdMain.cpp - clangd server loop ------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "ClangdLSPServer.h"
#include "CodeComplete.h"
#include "Features.inc"
#include "PathMapping.h"
#include "Protocol.h"
#include "Transport.h"
#include "index/Background.h"
#include "index/Serialization.h"
#include "refactor/Rename.h"
#include "support/Path.h"
#include "support/Shutdown.h"
#include "support/ThreadsafeFS.h"
#include "support/Trace.h"
#include "clang/Basic/Version.h"
#include "clang/Format/Format.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <chrono>
#include <cstdlib>
#include <iostream>
#include <memory>
#include <mutex>
#include <string>
#include <thread>
#ifndef _WIN32
#include <unistd.h>
#endif
namespace clang {
namespace clangd {
namespace {
using llvm::cl::cat;
using llvm::cl::CommaSeparated;
using llvm::cl::desc;
using llvm::cl::Hidden;
using llvm::cl::init;
using llvm::cl::list;
using llvm::cl::opt;
using llvm::cl::OptionCategory;
using llvm::cl::values;
// All flags must be placed in a category, or they will be shown neither in
// --help, nor --help-hidden!
OptionCategory CompileCommands("clangd compilation flags options");
OptionCategory Features("clangd feature options");
OptionCategory Misc("clangd miscellaneous options");
OptionCategory Protocol("clangd protocol and logging options");
const OptionCategory *ClangdCategories[] = {&Features, &Protocol,
&CompileCommands, &Misc};
enum CompileArgsFrom { LSPCompileArgs, FilesystemCompileArgs };
opt<CompileArgsFrom> CompileArgsFrom{
"compile_args_from",
cat(CompileCommands),
desc("The source of compile commands"),
values(clEnumValN(LSPCompileArgs, "lsp",
"All compile commands come from LSP and "
"'compile_commands.json' files are ignored"),
clEnumValN(FilesystemCompileArgs, "filesystem",
"All compile commands come from the "
"'compile_commands.json' files")),
init(FilesystemCompileArgs),
Hidden,
};
opt<Path> CompileCommandsDir{
"compile-commands-dir",
cat(CompileCommands),
desc("Specify a path to look for compile_commands.json. If path "
"is invalid, clangd will look in the current directory and "
"parent paths of each source file"),
};
opt<Path> ResourceDir{
"resource-dir",
cat(CompileCommands),
desc("Directory for system clang headers"),
init(""),
Hidden,
};
list<std::string> QueryDriverGlobs{
"query-driver",
cat(CompileCommands),
desc(
"Comma separated list of globs for white-listing gcc-compatible "
"drivers that are safe to execute. Drivers matching any of these globs "
"will be used to extract system includes. e.g. "
"/usr/bin/**/clang-*,/path/to/repo/**/g++-*"),
CommaSeparated,
};
// FIXME: Flags are the wrong mechanism for user preferences.
// We should probably read a dotfile or similar.
opt<bool> AllScopesCompletion{
"all-scopes-completion",
cat(Features),
desc("If set to true, code completion will include index symbols that are "
"not defined in the scopes (e.g. "
"namespaces) visible from the code completion point. Such completions "
"can insert scope qualifiers"),
init(true),
};
opt<bool> ShowOrigins{
"debug-origin",
cat(Features),
desc("Show origins of completion items"),
init(CodeCompleteOptions().ShowOrigins),
Hidden,
};
opt<bool> EnableBackgroundIndex{
"background-index",
cat(Features),
desc("Index project code in the background and persist index on disk."),
init(true),
};
opt<bool> EnableClangTidy{
"clang-tidy",
cat(Features),
desc("Enable clang-tidy diagnostics"),
init(true),
};
opt<std::string> ClangTidyChecks{
"clang-tidy-checks",
cat(Features),
desc("List of clang-tidy checks to run (this will override "
".clang-tidy files). Only meaningful when -clang-tidy flag is on"),
init(""),
};
opt<CodeCompleteOptions::CodeCompletionParse> CodeCompletionParse{
"completion-parse",
cat(Features),
desc("Whether the clang-parser is used for code-completion"),
values(clEnumValN(CodeCompleteOptions::AlwaysParse, "always",
"Block until the parser can be used"),
clEnumValN(CodeCompleteOptions::ParseIfReady, "auto",
"Use text-based completion if the parser "
"is not ready"),
clEnumValN(CodeCompleteOptions::NeverParse, "never",
"Always used text-based completion")),
init(CodeCompleteOptions().RunParser),
Hidden,
};
// FIXME: also support "plain" style where signatures are always omitted.
enum CompletionStyleFlag { Detailed, Bundled };
opt<CompletionStyleFlag> CompletionStyle{
"completion-style",
cat(Features),
desc("Granularity of code completion suggestions"),
values(clEnumValN(Detailed, "detailed",
"One completion item for each semantically distinct "
"completion, with full type information"),
clEnumValN(Bundled, "bundled",
"Similar completion items (e.g. function overloads) are "
"combined. Type information shown where possible")),
};
opt<std::string> FallbackStyle{
"fallback-style",
cat(Features),
desc("clang-format style to apply by default when "
"no .clang-format file is found"),
init(clang::format::DefaultFallbackStyle),
};
opt<bool> EnableFunctionArgSnippets{
"function-arg-placeholders",
cat(Features),
desc("When disabled, completions contain only parentheses for "
"function calls. When enabled, completions also contain "
"placeholders for method parameters"),
init(CodeCompleteOptions().EnableFunctionArgSnippets),
Hidden,
};
opt<CodeCompleteOptions::IncludeInsertion> HeaderInsertion{
"header-insertion",
cat(Features),
desc("Add #include directives when accepting code completions"),
init(CodeCompleteOptions().InsertIncludes),
values(
clEnumValN(CodeCompleteOptions::IWYU, "iwyu",
"Include what you use. "
"Insert the owning header for top-level symbols, unless the "
"header is already directly included or the symbol is "
"forward-declared"),
clEnumValN(
CodeCompleteOptions::NeverInsert, "never",
"Never insert #include directives as part of code completion")),
};
opt<bool> HeaderInsertionDecorators{
"header-insertion-decorators",
cat(Features),
desc("Prepend a circular dot or space before the completion "
"label, depending on whether "
"an include line will be inserted or not"),
init(true),
};
opt<bool> HiddenFeatures{
"hidden-features",
cat(Features),
desc("Enable hidden features mostly useful to clangd developers"),
init(false),
Hidden,
};
opt<bool> IncludeIneligibleResults{
"include-ineligible-results",
cat(Features),
desc("Include ineligible completion results (e.g. private members)"),
init(CodeCompleteOptions().IncludeIneligibleResults),
Hidden,
};
opt<bool> EnableIndex{
"index",
cat(Features),
desc("Enable index-based features. By default, clangd maintains an index "
"built from symbols in opened files. Global index support needs to "
"enabled separatedly"),
init(true),
Hidden,
};
opt<int> LimitResults{
"limit-results",
cat(Features),
desc("Limit the number of results returned by clangd. "
"0 means no limit (default=100)"),
init(100),
};
opt<bool> SuggestMissingIncludes{
"suggest-missing-includes",
cat(Features),
desc("Attempts to fix diagnostic errors caused by missing "
"includes using index"),
init(true),
};
list<std::string> TweakList{
"tweaks",
cat(Features),
desc("Specify a list of Tweaks to enable (only for clangd developers)."),
Hidden,
CommaSeparated,
};
opt<bool> CrossFileRename{
"cross-file-rename",
cat(Features),
desc("Enable cross-file rename feature."),
init(true),
};
opt<bool> RecoveryAST{
"recovery-ast",
cat(Features),
desc("Preserve expressions in AST for broken code (C++ only)."),
init(ClangdServer::Options().BuildRecoveryAST),
};
opt<bool> RecoveryASTType{
"recovery-ast-type",
cat(Features),
desc("Preserve the type for recovery AST. Note that "
"this feature is experimental and may lead to crashes"),
init(false),
Hidden,
};
opt<bool> FoldingRanges{
"folding-ranges",
cat(Features),
desc("Enable preview of FoldingRanges feature"),
init(false),
Hidden,
};
opt<unsigned> WorkerThreadsCount{
"j",
cat(Misc),
desc("Number of async workers used by clangd. Background index also "
"uses this many workers."),
init(getDefaultAsyncThreadsCount()),
};
opt<Path> IndexFile{
"index-file",
cat(Misc),
desc(
"Index file to build the static index. The file must have been created "
"by a compatible clangd-indexer\n"
"WARNING: This option is experimental only, and will be removed "
"eventually. Don't rely on it"),
init(""),
Hidden,
};
opt<bool> Test{
"lit-test",
cat(Misc),
desc("Abbreviation for -input-style=delimited -pretty -sync "
"-enable-test-scheme -enable-config=0 -log=verbose. "
"Intended to simplify lit tests"),
init(false),
Hidden,
};
enum PCHStorageFlag { Disk, Memory };
opt<PCHStorageFlag> PCHStorage{
"pch-storage",
cat(Misc),
desc("Storing PCHs in memory increases memory usages, but may "
"improve performance"),
values(
clEnumValN(PCHStorageFlag::Disk, "disk", "store PCHs on disk"),
clEnumValN(PCHStorageFlag::Memory, "memory", "store PCHs in memory")),
init(PCHStorageFlag::Disk),
};
opt<bool> Sync{
"sync",
cat(Misc),
desc("Handle client requests on main thread. Background index still uses "
"its own thread."),
init(false),
Hidden,
};
opt<JSONStreamStyle> InputStyle{
"input-style",
cat(Protocol),
desc("Input JSON stream encoding"),
values(
clEnumValN(JSONStreamStyle::Standard, "standard", "usual LSP protocol"),
clEnumValN(JSONStreamStyle::Delimited, "delimited",
"messages delimited by --- lines, with # comment support")),
init(JSONStreamStyle::Standard),
Hidden,
};
opt<bool> EnableTestScheme{
"enable-test-uri-scheme",
cat(Protocol),
desc("Enable 'test:' URI scheme. Only use in lit tests"),
init(false),
Hidden,
};
opt<std::string> PathMappingsArg{
"path-mappings",
cat(Protocol),
desc(
"Translates between client paths (as seen by a remote editor) and "
"server paths (where clangd sees files on disk). "
"Comma separated list of '<client_path>=<server_path>' pairs, the "
"first entry matching a given path is used. "
"e.g. /home/project/incl=/opt/include,/home/project=/workarea/project"),
init(""),
};
opt<Path> InputMirrorFile{
"input-mirror-file",
cat(Protocol),
desc("Mirror all LSP input to the specified file. Useful for debugging"),
init(""),
Hidden,
};
opt<Logger::Level> LogLevel{
"log",
cat(Protocol),
desc("Verbosity of log messages written to stderr"),
values(clEnumValN(Logger::Error, "error", "Error messages only"),
clEnumValN(Logger::Info, "info", "High level execution tracing"),
clEnumValN(Logger::Debug, "verbose", "Low level details")),
init(Logger::Info),
};
opt<OffsetEncoding> ForceOffsetEncoding{
"offset-encoding",
cat(Protocol),
desc("Force the offsetEncoding used for character positions. "
"This bypasses negotiation via client capabilities"),
values(
clEnumValN(OffsetEncoding::UTF8, "utf-8", "Offsets are in UTF-8 bytes"),
clEnumValN(OffsetEncoding::UTF16, "utf-16",
"Offsets are in UTF-16 code units"),
clEnumValN(OffsetEncoding::UTF32, "utf-32",
"Offsets are in unicode codepoints")),
init(OffsetEncoding::UnsupportedEncoding),
};
opt<bool> PrettyPrint{
"pretty",
cat(Protocol),
desc("Pretty-print JSON output"),
init(false),
};
opt<bool> AsyncPreamble{
"async-preamble",
cat(Misc),
desc("Reuse even stale preambles, and rebuild them in the background. This "
"improves latency at the cost of accuracy."),
init(ClangdServer::Options().AsyncPreambleBuilds),
Hidden,
};
opt<bool> EnableConfig{
"enable-config",
cat(Misc),
desc(
"Read user and project configuration from YAML files.\n"
"Project config is from a .clangd file in the project directory.\n"
"User config is from clangd/config.yaml in the following directories:\n"
"\tWindows: %USERPROFILE%\\AppData\\Local\n"
"\tMac OS: ~/Library/Preferences/\n"
"\tOthers: $XDG_CONFIG_HOME, usually ~/.config\n"
"Configuration is documented at https://clangd.llvm.org/config.html"),
init(false),
};
/// Supports a test URI scheme with relaxed constraints for lit tests.
/// The path in a test URI will be combined with a platform-specific fake
/// directory to form an absolute path. For example, test:///a.cpp is resolved
/// C:\clangd-test\a.cpp on Windows and /clangd-test/a.cpp on Unix.
class TestScheme : public URIScheme {
public:
llvm::Expected<std::string>
getAbsolutePath(llvm::StringRef /*Authority*/, llvm::StringRef Body,
llvm::StringRef /*HintPath*/) const override {
using namespace llvm::sys;
// Still require "/" in body to mimic file scheme, as we want lengths of an
// equivalent URI in both schemes to be the same.
if (!Body.startswith("/"))
return llvm::make_error<llvm::StringError>(
"Expect URI body to be an absolute path starting with '/': " + Body,
llvm::inconvertibleErrorCode());
Body = Body.ltrim('/');
llvm::SmallVector<char, 16> Path(Body.begin(), Body.end());
path::native(Path);
fs::make_absolute(TestScheme::TestDir, Path);
return std::string(Path.begin(), Path.end());
}
llvm::Expected<URI>
uriFromAbsolutePath(llvm::StringRef AbsolutePath) const override {
llvm::StringRef Body = AbsolutePath;
if (!Body.consume_front(TestScheme::TestDir)) {
return llvm::make_error<llvm::StringError>(
"Path " + AbsolutePath + " doesn't start with root " + TestDir,
llvm::inconvertibleErrorCode());
}
return URI("test", /*Authority=*/"",
llvm::sys::path::convert_to_slash(Body));
}
private:
const static char TestDir[];
};
#ifdef _WIN32
const char TestScheme::TestDir[] = "C:\\clangd-test";
#else
const char TestScheme::TestDir[] = "/clangd-test";
#endif
} // namespace
} // namespace clangd
} // namespace clang
enum class ErrorResultCode : int {
NoShutdownRequest = 1,
CantRunAsXPCService = 2
};
int main(int argc, char *argv[]) {
using namespace clang;
using namespace clang::clangd;
llvm::InitializeAllTargetInfos();
llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);
llvm::sys::SetInterruptFunction(&requestShutdown);
llvm::cl::SetVersionPrinter([](llvm::raw_ostream &OS) {
OS << clang::getClangToolFullVersion("clangd") << "\n";
});
const char *FlagsEnvVar = "CLANGD_FLAGS";
const char *Overview =
R"(clangd is a language server that provides IDE-like features to editors.
It should be used via an editor plugin rather than invoked directly. For more information, see:
https://clangd.llvm.org/
https://microsoft.github.io/language-server-protocol/
clangd accepts flags on the commandline, and in the CLANGD_FLAGS environment variable.
)";
llvm::cl::HideUnrelatedOptions(ClangdCategories);
llvm::cl::ParseCommandLineOptions(argc, argv, Overview,
/*Errs=*/nullptr, FlagsEnvVar);
if (Test) {
Sync = true;
InputStyle = JSONStreamStyle::Delimited;
LogLevel = Logger::Verbose;
PrettyPrint = true;
// Disable config system by default to avoid external reads.
if (!EnableConfig.getNumOccurrences())
EnableConfig = false;
// Disable background index on lit tests by default to prevent disk writes.
if (!EnableBackgroundIndex.getNumOccurrences())
EnableBackgroundIndex = false;
// Ensure background index makes progress.
else if (EnableBackgroundIndex)
BackgroundQueue::preventThreadStarvationInTests();
}
if (Test || EnableTestScheme) {
static URISchemeRegistry::Add<TestScheme> X(
"test", "Test scheme for clangd lit tests.");
}
if (!Sync && WorkerThreadsCount == 0) {
llvm::errs() << "A number of worker threads cannot be 0. Did you mean to "
"specify -sync?";
return 1;
}
if (Sync) {
if (WorkerThreadsCount.getNumOccurrences())
llvm::errs() << "Ignoring -j because -sync is set.\n";
WorkerThreadsCount = 0;
}
if (FallbackStyle.getNumOccurrences())
clang::format::DefaultFallbackStyle = FallbackStyle.c_str();
// Validate command line arguments.
llvm::Optional<llvm::raw_fd_ostream> InputMirrorStream;
if (!InputMirrorFile.empty()) {
std::error_code EC;
InputMirrorStream.emplace(InputMirrorFile, /*ref*/ EC,
llvm::sys::fs::FA_Read | llvm::sys::fs::FA_Write);
if (EC) {
InputMirrorStream.reset();
llvm::errs() << "Error while opening an input mirror file: "
<< EC.message();
} else {
InputMirrorStream->SetUnbuffered();
}
}
// Setup tracing facilities if CLANGD_TRACE is set. In practice enabling a
// trace flag in your editor's config is annoying, launching with
// `CLANGD_TRACE=trace.json vim` is easier.
llvm::Optional<llvm::raw_fd_ostream> TracerStream;
std::unique_ptr<trace::EventTracer> Tracer;
const char *JSONTraceFile = getenv("CLANGD_TRACE");
const char *MetricsCSVFile = getenv("CLANGD_METRICS");
const char *TracerFile = JSONTraceFile ? JSONTraceFile : MetricsCSVFile;
if (TracerFile) {
std::error_code EC;
TracerStream.emplace(TracerFile, /*ref*/ EC,
llvm::sys::fs::FA_Read | llvm::sys::fs::FA_Write);
if (EC) {
TracerStream.reset();
llvm::errs() << "Error while opening trace file " << TracerFile << ": "
<< EC.message();
} else {
Tracer = (TracerFile == JSONTraceFile)
? trace::createJSONTracer(*TracerStream, PrettyPrint)
: trace::createCSVMetricTracer(*TracerStream);
}
}
llvm::Optional<trace::Session> TracingSession;
if (Tracer)
TracingSession.emplace(*Tracer);
// If a user ran `clangd` in a terminal without redirecting anything,
// it's somewhat likely they're confused about how to use clangd.
// Show them the help overview, which explains.
if (llvm::outs().is_displayed() && llvm::errs().is_displayed())
llvm::errs() << Overview << "\n";
// Use buffered stream to stderr (we still flush each log message). Unbuffered
// stream can cause significant (non-deterministic) latency for the logger.
llvm::errs().SetBuffered();
// Don't flush stdout when logging, this would be both slow and racy!
llvm::errs().tie(nullptr);
StreamLogger Logger(llvm::errs(), LogLevel);
LoggingSession LoggingSession(Logger);
// Write some initial logs before we start doing any real work.
log("{0}", clang::getClangToolFullVersion("clangd"));
log("PID: {0}", llvm::sys::Process::getProcessId());
{
SmallString<128> CWD;
if (auto Err = llvm::sys::fs::current_path(CWD))
log("Working directory unknown: {0}", Err.message());
else
log("Working directory: {0}", CWD);
}
for (int I = 0; I < argc; ++I)
log("argv[{0}]: {1}", I, argv[I]);
if (auto EnvFlags = llvm::sys::Process::GetEnv(FlagsEnvVar))
log("{0}: {1}", FlagsEnvVar, *EnvFlags);
// If --compile-commands-dir arg was invoked, check value and override default
// path.
llvm::Optional<Path> CompileCommandsDirPath;
if (!CompileCommandsDir.empty()) {
if (llvm::sys::fs::exists(CompileCommandsDir)) {
// We support passing both relative and absolute paths to the
// --compile-commands-dir argument, but we assume the path is absolute in
// the rest of clangd so we make sure the path is absolute before
// continuing.
llvm::SmallString<128> Path(CompileCommandsDir);
if (std::error_code EC = llvm::sys::fs::make_absolute(Path)) {
llvm::errs() << "Error while converting the relative path specified by "
"--compile-commands-dir to an absolute path: "
<< EC.message() << ". The argument will be ignored.\n";
} else {
CompileCommandsDirPath = std::string(Path.str());
}
} else {
llvm::errs()
<< "Path specified by --compile-commands-dir does not exist. The "
"argument will be ignored.\n";
}
}
ClangdServer::Options Opts;
switch (PCHStorage) {
case PCHStorageFlag::Memory:
Opts.StorePreamblesInMemory = true;
break;
case PCHStorageFlag::Disk:
Opts.StorePreamblesInMemory = false;
break;
}
if (!ResourceDir.empty())
Opts.ResourceDir = ResourceDir;
Opts.BuildDynamicSymbolIndex = EnableIndex;
Opts.BackgroundIndex = EnableBackgroundIndex;
std::unique_ptr<SymbolIndex> StaticIdx;
std::future<void> AsyncIndexLoad; // Block exit while loading the index.
if (EnableIndex && !IndexFile.empty()) {
// Load the index asynchronously. Meanwhile SwapIndex returns no results.
SwapIndex *Placeholder;
StaticIdx.reset(Placeholder = new SwapIndex(std::make_unique<MemIndex>()));
AsyncIndexLoad = runAsync<void>([Placeholder] {
if (auto Idx = loadIndex(IndexFile, /*UseDex=*/true))
Placeholder->reset(std::move(Idx));
});
if (Sync)
AsyncIndexLoad.wait();
}
Opts.StaticIndex = StaticIdx.get();
Opts.AsyncThreadsCount = WorkerThreadsCount;
Opts.BuildRecoveryAST = RecoveryAST;
Opts.PreserveRecoveryASTType = RecoveryASTType;
Opts.FoldingRanges = FoldingRanges;
clangd::CodeCompleteOptions CCOpts;
CCOpts.IncludeIneligibleResults = IncludeIneligibleResults;
CCOpts.Limit = LimitResults;
if (CompletionStyle.getNumOccurrences())
CCOpts.BundleOverloads = CompletionStyle != Detailed;
CCOpts.ShowOrigins = ShowOrigins;
CCOpts.InsertIncludes = HeaderInsertion;
if (!HeaderInsertionDecorators) {
CCOpts.IncludeIndicator.Insert.clear();
CCOpts.IncludeIndicator.NoInsert.clear();
}
CCOpts.SpeculativeIndexRequest = Opts.StaticIndex;
CCOpts.EnableFunctionArgSnippets = EnableFunctionArgSnippets;
CCOpts.AllScopes = AllScopesCompletion;
CCOpts.RunParser = CodeCompletionParse;
RealThreadsafeFS TFS;
std::vector<std::unique_ptr<config::Provider>> ProviderStack;
std::unique_ptr<config::Provider> Config;
if (EnableConfig) {
ProviderStack.push_back(
config::Provider::fromAncestorRelativeYAMLFiles(".clangd", TFS));
llvm::SmallString<256> UserConfig;
if (llvm::sys::path::user_config_directory(UserConfig)) {
llvm::sys::path::append(UserConfig, "clangd", "config.yaml");
vlog("User config file is {0}", UserConfig);
ProviderStack.push_back(config::Provider::fromYAMLFile(UserConfig, TFS));
} else {
elog("Couldn't determine user config file, not loading");
}
std::vector<const config::Provider *> ProviderPointers;
for (const auto& P : ProviderStack)
ProviderPointers.push_back(P.get());
Config = config::Provider::combine(std::move(ProviderPointers));
Opts.ConfigProvider = Config.get();
}
// Initialize and run ClangdLSPServer.
// Change stdin to binary to not lose \r\n on windows.
llvm::sys::ChangeStdinToBinary();
std::unique_ptr<Transport> TransportLayer;
if (getenv("CLANGD_AS_XPC_SERVICE")) {
#if CLANGD_BUILD_XPC
log("Starting LSP over XPC service");
TransportLayer = newXPCTransport();
#else
llvm::errs() << "This clangd binary wasn't built with XPC support.\n";
return (int)ErrorResultCode::CantRunAsXPCService;
#endif
} else {
log("Starting LSP over stdin/stdout");
TransportLayer = newJSONTransport(
stdin, llvm::outs(),
InputMirrorStream ? InputMirrorStream.getPointer() : nullptr,
PrettyPrint, InputStyle);
}
if (!PathMappingsArg.empty()) {
auto Mappings = parsePathMappings(PathMappingsArg);
if (!Mappings) {
elog("Invalid -path-mappings: {0}", Mappings.takeError());
return 1;
}
TransportLayer = createPathMappingTransport(std::move(TransportLayer),
std::move(*Mappings));
}
// Create an empty clang-tidy option.
std::mutex ClangTidyOptMu;
std::unique_ptr<tidy::ClangTidyOptionsProvider>
ClangTidyOptProvider; /*GUARDED_BY(ClangTidyOptMu)*/
if (EnableClangTidy) {
auto EmptyDefaults = tidy::ClangTidyOptions::getDefaults();
EmptyDefaults.Checks.reset(); // So we can tell if checks were ever set.
tidy::ClangTidyOptions OverrideClangTidyOptions;
if (!ClangTidyChecks.empty())
OverrideClangTidyOptions.Checks = ClangTidyChecks;
ClangTidyOptProvider = std::make_unique<tidy::FileOptionsProvider>(
tidy::ClangTidyGlobalOptions(),
/* Default */ EmptyDefaults,
/* Override */ OverrideClangTidyOptions, TFS.view(/*CWD=*/llvm::None));
Opts.GetClangTidyOptions = [&](llvm::vfs::FileSystem &,
llvm::StringRef File) {
// This function must be thread-safe and tidy option providers are not.
tidy::ClangTidyOptions Opts;
{
std::lock_guard<std::mutex> Lock(ClangTidyOptMu);
// FIXME: use the FS provided to the function.
Opts = ClangTidyOptProvider->getOptions(File);
}
if (!Opts.Checks) {
// If the user hasn't configured clang-tidy checks at all, including
// via .clang-tidy, give them a nice set of checks.
// (This should be what the "default" options does, but it isn't...)
//
// These default checks are chosen for:
// - low false-positive rate
// - providing a lot of value
// - being reasonably efficient
Opts.Checks = llvm::join_items(
",", "readability-misleading-indentation",
"readability-deleted-default", "bugprone-integer-division",
"bugprone-sizeof-expression", "bugprone-suspicious-missing-comma",
"bugprone-unused-raii", "bugprone-unused-return-value",
"misc-unused-using-decls", "misc-unused-alias-decls",
"misc-definitions-in-headers");
}
return Opts;
};
}
Opts.SuggestMissingIncludes = SuggestMissingIncludes;
Opts.QueryDriverGlobs = std::move(QueryDriverGlobs);
Opts.TweakFilter = [&](const Tweak &T) {
if (T.hidden() && !HiddenFeatures)
return false;
if (TweakList.getNumOccurrences())
return llvm::is_contained(TweakList, T.id());
return true;
};
llvm::Optional<OffsetEncoding> OffsetEncodingFromFlag;
if (ForceOffsetEncoding != OffsetEncoding::UnsupportedEncoding)
OffsetEncodingFromFlag = ForceOffsetEncoding;
clangd::RenameOptions RenameOpts;
// Shall we allow to customize the file limit?
RenameOpts.AllowCrossFile = CrossFileRename;
Opts.AsyncPreambleBuilds = AsyncPreamble;
ClangdLSPServer LSPServer(
*TransportLayer, TFS, CCOpts, RenameOpts, CompileCommandsDirPath,
/*UseDirBasedCDB=*/CompileArgsFrom == FilesystemCompileArgs,
OffsetEncodingFromFlag, Opts);
llvm::set_thread_name("clangd.main");
int ExitCode = LSPServer.run()
? 0
: static_cast<int>(ErrorResultCode::NoShutdownRequest);
log("LSP finished, exiting with status {0}", ExitCode);
// There may still be lingering background threads (e.g. slow requests
// whose results will be dropped, background index shutting down).
//
// These should terminate quickly, and ~ClangdLSPServer blocks on them.
// However if a bug causes them to run forever, we want to ensure the process
// eventually exits. As clangd isn't directly user-facing, an editor can
// "leak" clangd processes. Crashing in this case contains the damage.
abortAfterTimeout(std::chrono::minutes(5));
return ExitCode;
}
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