1 #![feature(rustc_private)]
3 extern crate env_logger;
7 extern crate log_settings;
10 extern crate rustc_metadata;
11 extern crate rustc_driver;
12 extern crate rustc_errors;
13 extern crate rustc_codegen_utils;
14 extern crate rustc_interface;
17 use std::str::FromStr;
20 use rustc_interface::interface;
21 use rustc::hir::def_id::LOCAL_CRATE;
23 struct MiriCompilerCalls {
24 miri_config: miri::MiriConfig,
27 impl rustc_driver::Callbacks for MiriCompilerCalls {
28 fn after_parsing(&mut self, compiler: &interface::Compiler) -> bool {
30 syntax::symbol::Symbol::intern("miri"),
31 syntax::feature_gate::AttributeType::Whitelisted,
33 compiler.session().plugin_attributes.borrow_mut().push(attr);
39 fn after_analysis(&mut self, compiler: &interface::Compiler) -> bool {
41 compiler.session().abort_if_errors();
43 compiler.global_ctxt().unwrap().peek_mut().enter(|tcx| {
44 let (entry_def_id, _) = tcx.entry_fn(LOCAL_CRATE).expect("no main function found!");
45 let mut config = self.miri_config.clone();
47 // Add filename to `miri` arguments.
48 config.args.insert(0, compiler.input().filestem().to_string());
50 miri::eval_main(tcx, entry_def_id, config);
53 compiler.session().abort_if_errors();
55 // Don't continue execution
60 fn init_early_loggers() {
61 // Note that our `extern crate log` is *not* the same as rustc's; as a result, we have to
62 // initialize them both, and we always initialize `miri`'s first.
63 let env = env_logger::Env::new().filter("MIRI_LOG").write_style("MIRI_LOG_STYLE");
64 env_logger::init_from_env(env);
65 // We only initialize `rustc` if the env var is set (so the user asked for it).
66 // If it is not set, we avoid initializing now so that we can initialize
67 // later with our custom settings, and *not* log anything for what happens before
68 // `miri` gets started.
69 if env::var("RUSTC_LOG").is_ok() {
70 rustc_driver::init_rustc_env_logger();
74 fn init_late_loggers() {
75 // We initialize loggers right before we start evaluation. We overwrite the `RUSTC_LOG`
76 // env var if it is not set, control it based on `MIRI_LOG`.
77 if let Ok(var) = env::var("MIRI_LOG") {
78 if env::var("RUSTC_LOG").is_err() {
79 // We try to be a bit clever here: if `MIRI_LOG` is just a single level
80 // used for everything, we only apply it to the parts of rustc that are
81 // CTFE-related. Otherwise, we use it verbatim for `RUSTC_LOG`.
82 // This way, if you set `MIRI_LOG=trace`, you get only the right parts of
83 // rustc traced, but you can also do `MIRI_LOG=miri=trace,rustc_mir::interpret=debug`.
84 if log::Level::from_str(&var).is_ok() {
85 env::set_var("RUSTC_LOG",
86 &format!("rustc::mir::interpret={0},rustc_mir::interpret={0}", var));
88 env::set_var("RUSTC_LOG", &var);
90 rustc_driver::init_rustc_env_logger();
94 // If `MIRI_BACKTRACE` is set and `RUST_CTFE_BACKTRACE` is not, set `RUST_CTFE_BACKTRACE`.
95 // Do this late, so we really only apply this to miri's errors.
96 if let Ok(var) = env::var("MIRI_BACKTRACE") {
97 if env::var("RUST_CTFE_BACKTRACE") == Err(env::VarError::NotPresent) {
98 env::set_var("RUST_CTFE_BACKTRACE", &var);
103 /// Returns the "default sysroot" that Miri will use if no `--sysroot` flag is set.
104 /// Should be a compile-time constant.
105 fn compile_time_sysroot() -> Option<String> {
106 if option_env!("RUSTC_STAGE").is_some() {
107 // This is being built as part of rustc, and gets shipped with rustup.
108 // We can rely on the sysroot computation in librustc.
111 // For builds outside rustc, we need to ensure that we got a sysroot
112 // that gets used as a default. The sysroot computation in librustc would
113 // end up somewhere in the build dir.
114 // Taken from PR <https://github.com/Manishearth/rust-clippy/pull/911>.
115 let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
116 let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
117 Some(match (home, toolchain) {
118 (Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
120 option_env!("RUST_SYSROOT")
121 .expect("To build Miri without rustup, set the `RUST_SYSROOT` env var at build time")
128 init_early_loggers();
130 // Parse our arguments and split them across `rustc` and `miri`.
131 let mut validate = true;
132 let mut seed: Option<u64> = None;
133 let mut rustc_args = vec![];
134 let mut miri_args = vec![];
135 let mut after_dashdash = false;
136 for arg in std::env::args() {
137 if rustc_args.is_empty() {
138 // Very first arg: for `rustc`.
139 rustc_args.push(arg);
141 else if after_dashdash {
142 // Everything that comes after are `miri` args.
146 "-Zmiri-disable-validation" => {
150 after_dashdash = true;
152 arg if arg.starts_with("-Zmiri-seed=") => {
154 panic!("Cannot specify -Zmiri-seed multiple times!");
156 let seed_raw = hex::decode(arg.trim_start_matches("-Zmiri-seed=")).unwrap();
157 if seed_raw.len() > 8 {
158 panic!(format!("-Zmiri-seed must be at most 8 bytes, was {}", seed_raw.len()));
161 let mut bytes = [0; 8];
162 bytes[..seed_raw.len()].copy_from_slice(&seed_raw);
163 seed = Some(u64::from_be_bytes(bytes));
167 rustc_args.push(arg);
173 // Determine sysroot if needed. Make sure we always call `compile_time_sysroot`
174 // as that also does some sanity-checks of the environment we were built in.
175 // FIXME: Ideally we'd turn a bad build env into a compile-time error, but
176 // CTFE does not seem powerful enough for that yet.
177 if let Some(sysroot) = compile_time_sysroot() {
178 let sysroot_flag = "--sysroot".to_string();
179 if !rustc_args.contains(&sysroot_flag) {
180 // We need to overwrite the default that librustc would compute.
181 rustc_args.push(sysroot_flag);
182 rustc_args.push(sysroot);
186 // Finally, add the default flags all the way in the beginning, but after the binary name.
187 rustc_args.splice(1..1, miri::miri_default_args().iter().map(ToString::to_string));
189 debug!("rustc arguments: {:?}", rustc_args);
190 debug!("miri arguments: {:?}", miri_args);
191 let miri_config = miri::MiriConfig { validate, args: miri_args, seed };
192 let result = rustc_driver::report_ices_to_stderr_if_any(move || {
193 rustc_driver::run_compiler(&rustc_args, &mut MiriCompilerCalls { miri_config }, None, None)
194 }).and_then(|result| result);
195 std::process::exit(result.is_err() as i32);