1 #![feature(rustc_private)]
3 // FIXME: switch to something more ergonomic here, once available.
4 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
5 #[allow(unused_extern_crates)]
6 extern crate rustc_driver;
7 #[allow(unused_extern_crates)]
8 extern crate rustc_interface;
9 #[allow(unused_extern_crates)]
10 extern crate rustc_plugin;
12 use rustc_interface::interface;
13 use rustc_tools_util::*;
16 use std::process::{exit, Command};
18 /// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
19 /// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
21 args: impl IntoIterator<Item = &'a String>,
23 pred: impl Fn(&str) -> bool,
24 ) -> Option<&'a str> {
25 let mut args = args.into_iter().map(String::as_str);
27 while let Some(arg) = args.next() {
28 let arg: Vec<_> = arg.splitn(2, '=').collect();
29 if arg.get(0) != Some(&find_arg) {
33 let value = arg.get(1).cloned().or_else(|| args.next());
34 if value.as_ref().map_or(false, |p| pred(p)) {
43 let args: Vec<_> = ["--bar=bar", "--foobar", "123", "--foo"]
45 .map(std::string::ToString::to_string)
48 assert_eq!(arg_value(None, "--foobar", |_| true), None);
49 assert_eq!(arg_value(&args, "--bar", |_| false), None);
50 assert_eq!(arg_value(&args, "--bar", |_| true), Some("bar"));
51 assert_eq!(arg_value(&args, "--bar", |p| p == "bar"), Some("bar"));
52 assert_eq!(arg_value(&args, "--bar", |p| p == "foo"), None);
53 assert_eq!(arg_value(&args, "--foobar", |p| p == "foo"), None);
54 assert_eq!(arg_value(&args, "--foobar", |p| p == "123"), Some("123"));
55 assert_eq!(arg_value(&args, "--foo", |_| true), None);
58 #[allow(clippy::too_many_lines)]
60 struct ClippyCallbacks;
62 impl rustc_driver::Callbacks for ClippyCallbacks {
63 fn after_parsing(&mut self, compiler: &interface::Compiler) -> bool {
64 let sess = compiler.session();
65 let mut registry = rustc_plugin::registry::Registry::new(
70 "at this compilation stage \
71 the crate must be parsed",
76 registry.args_hidden = Some(Vec::new());
78 let conf = clippy_lints::read_conf(®istry);
79 clippy_lints::register_plugins(&mut registry, &conf);
81 let rustc_plugin::registry::Registry {
89 let mut ls = sess.lint_store.borrow_mut();
90 for pass in early_lint_passes {
91 ls.register_early_pass(Some(sess), true, false, pass);
93 for pass in late_lint_passes {
94 ls.register_late_pass(Some(sess), true, false, false, pass);
97 for (name, (to, deprecated_name)) in lint_groups {
98 ls.register_group(Some(sess), true, name, deprecated_name, to);
100 clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
101 clippy_lints::register_renamed(&mut ls);
103 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
104 sess.plugin_attributes.borrow_mut().extend(attributes);
106 // Continue execution
112 rustc_driver::init_rustc_env_logger();
114 rustc_driver::report_ices_to_stderr_if_any(move || {
117 if std::env::args().any(|a| a == "--version" || a == "-V") {
118 let version_info = rustc_tools_util::get_version_info!();
119 println!("{}", version_info);
123 let mut orig_args: Vec<String> = env::args().collect();
125 // Get the sysroot, looking from most specific to this invocation to the least:
127 // - runtime environment
129 // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
130 // - sysroot from rustc in the path
131 // - compile-time environment
132 let sys_root_arg = arg_value(&orig_args, "--sysroot", |_| true);
133 let have_sys_root_arg = sys_root_arg.is_some();
134 let sys_root = sys_root_arg
135 .map(std::string::ToString::to_string)
136 .or_else(|| std::env::var("SYSROOT").ok())
138 let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
139 let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
140 home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
143 Command::new("rustc")
148 .and_then(|out| String::from_utf8(out.stdout).ok())
149 .map(|s| s.trim().to_owned())
151 .or_else(|| option_env!("SYSROOT").map(String::from))
152 .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
154 // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
155 // We're invoking the compiler programmatically, so we ignore this/
156 if orig_args.len() <= 1 {
157 std::process::exit(1);
159 if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
160 // we still want to be able to invoke it normally though
163 // this conditional check for the --sysroot flag is there so users can call
164 // `clippy_driver` directly
165 // without having to pass --sysroot or anything
166 let mut args: Vec<String> = if have_sys_root_arg {
172 .chain(Some("--sysroot".to_owned()))
173 .chain(Some(sys_root))
177 // this check ensures that dependencies are built but not linted and the final
179 // linted but not built
180 let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
181 || arg_value(&orig_args, "--emit", |val| val.split(',').any(|e| e == "metadata")).is_some();
184 args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
185 if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
186 args.extend(extra_args.split("__CLIPPY_HACKERY__").filter_map(|s| {
196 let mut clippy = ClippyCallbacks;
197 let mut default = rustc_driver::DefaultCallbacks;
198 let callbacks: &mut (dyn rustc_driver::Callbacks + Send) =
199 if clippy_enabled { &mut clippy } else { &mut default };
201 rustc_driver::run_compiler(&args, callbacks, None, None)
203 .and_then(|result| result)