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main.rs
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main.rs
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//! Driver for rust-analyzer.
//!
//! Based on cli flags, either spawns an LSP server, or runs a batch analysis
#![warn(rust_2018_idioms, unused_lifetimes)]
#![allow(clippy::print_stdout, clippy::print_stderr)]
#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
#[cfg(feature = "in-rust-tree")]
extern crate rustc_driver as _;
mod rustc_wrapper;
use std::{env, fs, path::PathBuf, process::ExitCode, sync::Arc};
use anyhow::Context;
use lsp_server::Connection;
use rust_analyzer::{cli::flags, config::Config, from_json};
use tracing_subscriber::fmt::writer::BoxMakeWriter;
use vfs::AbsPathBuf;
#[cfg(feature = "mimalloc")]
#[global_allocator]
static ALLOC: mimalloc::MiMalloc = mimalloc::MiMalloc;
#[cfg(all(feature = "jemalloc", not(target_env = "msvc")))]
#[global_allocator]
static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
fn main() -> anyhow::Result<ExitCode> {
if std::env::var("RA_RUSTC_WRAPPER").is_ok() {
rustc_wrapper::main().map_err(Into::into)
} else {
actual_main()
}
}
fn actual_main() -> anyhow::Result<ExitCode> {
let flags = flags::RustAnalyzer::from_env_or_exit();
#[cfg(debug_assertions)]
if flags.wait_dbg || env::var("RA_WAIT_DBG").is_ok() {
#[allow(unused_mut)]
let mut d = 4;
while d == 4 {
d = 4;
}
}
setup_logging(flags.log_file.clone())?;
let verbosity = flags.verbosity();
match flags.subcommand {
flags::RustAnalyzerCmd::LspServer(cmd) => 'lsp_server: {
if cmd.print_config_schema {
println!("{:#}", Config::json_schema());
break 'lsp_server;
}
if cmd.version {
println!("rust-analyzer {}", rust_analyzer::version());
break 'lsp_server;
}
// rust-analyzer’s “main thread” is actually
// a secondary latency-sensitive thread with an increased stack size.
// We use this thread intent because any delay in the main loop
// will make actions like hitting enter in the editor slow.
with_extra_thread(
"LspServer",
stdx::thread::ThreadIntent::LatencySensitive,
run_server,
)?;
}
flags::RustAnalyzerCmd::Parse(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Symbols(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Highlight(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::AnalysisStats(cmd) => cmd.run(verbosity)?,
flags::RustAnalyzerCmd::Diagnostics(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Ssr(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Search(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Lsif(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::Scip(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::RunTests(cmd) => cmd.run()?,
flags::RustAnalyzerCmd::RustcTests(cmd) => cmd.run()?,
}
Ok(ExitCode::SUCCESS)
}
fn setup_logging(log_file_flag: Option<PathBuf>) -> anyhow::Result<()> {
if cfg!(windows) {
// This is required so that windows finds our pdb that is placed right beside the exe.
// By default it doesn't look at the folder the exe resides in, only in the current working
// directory which we set to the project workspace.
// https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/general-environment-variables
// https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-syminitialize
if let Ok(path) = env::current_exe() {
if let Some(path) = path.parent() {
env::set_var("_NT_SYMBOL_PATH", path);
}
}
}
if env::var("RUST_BACKTRACE").is_err() {
env::set_var("RUST_BACKTRACE", "short");
}
let log_file = env::var("RA_LOG_FILE").ok().map(PathBuf::from).or(log_file_flag);
let log_file = match log_file {
Some(path) => {
if let Some(parent) = path.parent() {
let _ = fs::create_dir_all(parent);
}
Some(
fs::File::create(&path)
.with_context(|| format!("can't create log file at {}", path.display()))?,
)
}
None => None,
};
let writer = match log_file {
Some(file) => BoxMakeWriter::new(Arc::new(file)),
None => BoxMakeWriter::new(std::io::stderr),
};
rust_analyzer::tracing::Config {
writer,
// Deliberately enable all `error` logs if the user has not set RA_LOG, as there is usually
// useful information in there for debugging.
filter: env::var("RA_LOG").ok().unwrap_or_else(|| "error".to_owned()),
chalk_filter: env::var("CHALK_DEBUG").ok(),
profile_filter: env::var("RA_PROFILE").ok(),
}
.init()?;
Ok(())
}
const STACK_SIZE: usize = 1024 * 1024 * 8;
/// Parts of rust-analyzer can use a lot of stack space, and some operating systems only give us
/// 1 MB by default (eg. Windows), so this spawns a new thread with hopefully sufficient stack
/// space.
fn with_extra_thread(
thread_name: impl Into<String>,
thread_intent: stdx::thread::ThreadIntent,
f: impl FnOnce() -> anyhow::Result<()> + Send + 'static,
) -> anyhow::Result<()> {
let handle = stdx::thread::Builder::new(thread_intent)
.name(thread_name.into())
.stack_size(STACK_SIZE)
.spawn(f)?;
handle.join()?;
Ok(())
}
fn run_server() -> anyhow::Result<()> {
tracing::info!("server version {} will start", rust_analyzer::version());
let (connection, io_threads) = Connection::stdio();
let (initialize_id, initialize_params) = match connection.initialize_start() {
Ok(it) => it,
Err(e) => {
if e.channel_is_disconnected() {
io_threads.join()?;
}
return Err(e.into());
}
};
tracing::info!("InitializeParams: {}", initialize_params);
let lsp_types::InitializeParams {
root_uri,
capabilities,
workspace_folders,
initialization_options,
client_info,
..
} = from_json::<lsp_types::InitializeParams>("InitializeParams", &initialize_params)?;
let root_path = match root_uri
.and_then(|it| it.to_file_path().ok())
.map(patch_path_prefix)
.and_then(|it| AbsPathBuf::try_from(it).ok())
{
Some(it) => it,
None => {
let cwd = env::current_dir()?;
AbsPathBuf::assert(cwd)
}
};
let mut is_visual_studio_code = false;
if let Some(client_info) = client_info {
tracing::info!("Client '{}' {}", client_info.name, client_info.version.unwrap_or_default());
is_visual_studio_code = client_info.name.starts_with("Visual Studio Code");
}
let workspace_roots = workspace_folders
.map(|workspaces| {
workspaces
.into_iter()
.filter_map(|it| it.uri.to_file_path().ok())
.map(patch_path_prefix)
.filter_map(|it| AbsPathBuf::try_from(it).ok())
.collect::<Vec<_>>()
})
.filter(|workspaces| !workspaces.is_empty())
.unwrap_or_else(|| vec![root_path.clone()]);
let mut config = Config::new(root_path, capabilities, workspace_roots, is_visual_studio_code);
if let Some(json) = initialization_options {
if let Err(e) = config.update(json) {
use lsp_types::{
notification::{Notification, ShowMessage},
MessageType, ShowMessageParams,
};
let not = lsp_server::Notification::new(
ShowMessage::METHOD.to_owned(),
ShowMessageParams { typ: MessageType::WARNING, message: e.to_string() },
);
connection.sender.send(lsp_server::Message::Notification(not)).unwrap();
}
}
let server_capabilities = rust_analyzer::server_capabilities(&config);
let initialize_result = lsp_types::InitializeResult {
capabilities: server_capabilities,
server_info: Some(lsp_types::ServerInfo {
name: String::from("rust-analyzer"),
version: Some(rust_analyzer::version().to_string()),
}),
offset_encoding: None,
};
let initialize_result = serde_json::to_value(initialize_result).unwrap();
if let Err(e) = connection.initialize_finish(initialize_id, initialize_result) {
if e.channel_is_disconnected() {
io_threads.join()?;
}
return Err(e.into());
}
if !config.has_linked_projects() && config.detached_files().is_empty() {
config.rediscover_workspaces();
}
rust_analyzer::main_loop(config, connection)?;
io_threads.join()?;
tracing::info!("server did shut down");
Ok(())
}
fn patch_path_prefix(path: PathBuf) -> PathBuf {
use std::path::{Component, Prefix};
if cfg!(windows) {
// VSCode might report paths with the file drive in lowercase, but this can mess
// with env vars set by tools and build scripts executed by r-a such that it invalidates
// cargo's compilations unnecessarily. https://github.com/rust-lang/rust-analyzer/issues/14683
// So we just uppercase the drive letter here unconditionally.
// (doing it conditionally is a pain because std::path::Prefix always reports uppercase letters on windows)
let mut comps = path.components();
match comps.next() {
Some(Component::Prefix(prefix)) => {
let prefix = match prefix.kind() {
Prefix::Disk(d) => {
format!("{}:", d.to_ascii_uppercase() as char)
}
Prefix::VerbatimDisk(d) => {
format!(r"\\?\{}:", d.to_ascii_uppercase() as char)
}
_ => return path,
};
let mut path = PathBuf::new();
path.push(prefix);
path.extend(comps);
path
}
_ => path,
}
} else {
path
}
}
#[test]
#[cfg(windows)]
fn patch_path_prefix_works() {
assert_eq!(patch_path_prefix(r"c:\foo\bar".into()), PathBuf::from(r"C:\foo\bar"));
assert_eq!(patch_path_prefix(r"\\?\c:\foo\bar".into()), PathBuf::from(r"\\?\C:\foo\bar"));
}