220 lines
8.4 KiB
Rust
220 lines
8.4 KiB
Rust
#![feature(rustc_private)]
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extern crate env_logger;
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extern crate getopts;
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#[macro_use]
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extern crate log;
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extern crate log_settings;
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extern crate miri;
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extern crate rustc;
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extern crate rustc_metadata;
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extern crate rustc_driver;
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extern crate rustc_errors;
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extern crate rustc_codegen_utils;
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extern crate rustc_interface;
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extern crate syntax;
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use std::str::FromStr;
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use std::env;
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use hex::FromHexError;
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use rustc_interface::interface;
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use rustc::hir::def_id::LOCAL_CRATE;
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use rustc_driver::Compilation;
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struct MiriCompilerCalls {
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miri_config: miri::MiriConfig,
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}
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impl rustc_driver::Callbacks for MiriCompilerCalls {
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fn after_parsing(&mut self, compiler: &interface::Compiler) -> Compilation {
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let attr = (
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syntax::symbol::Symbol::intern("miri"),
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syntax::feature_gate::AttributeType::Whitelisted,
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);
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compiler.session().plugin_attributes.borrow_mut().push(attr);
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Compilation::Continue
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}
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fn after_analysis(&mut self, compiler: &interface::Compiler) -> Compilation {
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init_late_loggers();
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compiler.session().abort_if_errors();
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compiler.global_ctxt().unwrap().peek_mut().enter(|tcx| {
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let (entry_def_id, _) = tcx.entry_fn(LOCAL_CRATE).expect("no main function found!");
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let mut config = self.miri_config.clone();
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// Add filename to `miri` arguments.
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config.args.insert(0, compiler.input().filestem().to_string());
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miri::eval_main(tcx, entry_def_id, config);
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});
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compiler.session().abort_if_errors();
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Compilation::Stop
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}
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}
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fn init_early_loggers() {
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// Note that our `extern crate log` is *not* the same as rustc's; as a result, we have to
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// initialize them both, and we always initialize `miri`'s first.
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let env = env_logger::Env::new().filter("MIRI_LOG").write_style("MIRI_LOG_STYLE");
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env_logger::init_from_env(env);
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// We only initialize `rustc` if the env var is set (so the user asked for it).
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// If it is not set, we avoid initializing now so that we can initialize
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// later with our custom settings, and *not* log anything for what happens before
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// `miri` gets started.
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if env::var("RUSTC_LOG").is_ok() {
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rustc_driver::init_rustc_env_logger();
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}
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}
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fn init_late_loggers() {
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// We initialize loggers right before we start evaluation. We overwrite the `RUSTC_LOG`
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// env var if it is not set, control it based on `MIRI_LOG`.
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if let Ok(var) = env::var("MIRI_LOG") {
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if env::var("RUSTC_LOG").is_err() {
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// We try to be a bit clever here: if `MIRI_LOG` is just a single level
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// used for everything, we only apply it to the parts of rustc that are
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// CTFE-related. Otherwise, we use it verbatim for `RUSTC_LOG`.
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// This way, if you set `MIRI_LOG=trace`, you get only the right parts of
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// rustc traced, but you can also do `MIRI_LOG=miri=trace,rustc_mir::interpret=debug`.
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if log::Level::from_str(&var).is_ok() {
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env::set_var("RUSTC_LOG",
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&format!("rustc::mir::interpret={0},rustc_mir::interpret={0}", var));
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} else {
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env::set_var("RUSTC_LOG", &var);
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}
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rustc_driver::init_rustc_env_logger();
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}
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}
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// If `MIRI_BACKTRACE` is set and `RUSTC_CTFE_BACKTRACE` is not, set `RUSTC_CTFE_BACKTRACE`.
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// Do this late, so we ideally only apply this to Miri's errors.
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if let Ok(var) = env::var("MIRI_BACKTRACE") {
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if env::var("RUSTC_CTFE_BACKTRACE") == Err(env::VarError::NotPresent) {
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env::set_var("RUSTC_CTFE_BACKTRACE", &var);
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}
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}
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}
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/// Returns the "default sysroot" that Miri will use if no `--sysroot` flag is set.
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/// Should be a compile-time constant.
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fn compile_time_sysroot() -> Option<String> {
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if option_env!("RUSTC_STAGE").is_some() {
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// This is being built as part of rustc, and gets shipped with rustup.
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// We can rely on the sysroot computation in librustc.
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return None;
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}
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// For builds outside rustc, we need to ensure that we got a sysroot
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// that gets used as a default. The sysroot computation in librustc would
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// end up somewhere in the build dir.
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// Taken from PR <https://github.com/Manishearth/rust-clippy/pull/911>.
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let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
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let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
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Some(match (home, toolchain) {
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(Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
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_ => {
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option_env!("RUST_SYSROOT")
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.expect("To build Miri without rustup, set the `RUST_SYSROOT` env var at build time")
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.to_owned()
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}
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})
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}
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fn main() {
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init_early_loggers();
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// Parse our arguments and split them across `rustc` and `miri`.
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let mut validate = true;
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let mut communicate = false;
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let mut seed: Option<u64> = None;
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let mut rustc_args = vec![];
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let mut miri_args = vec![];
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let mut after_dashdash = false;
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let mut excluded_env_vars = vec![];
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for arg in std::env::args() {
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if rustc_args.is_empty() {
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// Very first arg: for `rustc`.
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rustc_args.push(arg);
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}
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else if after_dashdash {
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// Everything that comes after are `miri` args.
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miri_args.push(arg);
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} else {
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match arg.as_str() {
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"-Zmiri-disable-validation" => {
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validate = false;
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},
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"-Zmiri-disable-isolation" => {
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communicate = true;
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},
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"--" => {
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after_dashdash = true;
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}
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arg if arg.starts_with("-Zmiri-seed=") => {
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if seed.is_some() {
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panic!("Cannot specify -Zmiri-seed multiple times!");
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}
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let seed_raw = hex::decode(arg.trim_start_matches("-Zmiri-seed="))
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.unwrap_or_else(|err| match err {
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FromHexError::InvalidHexCharacter { .. } => panic!(
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"-Zmiri-seed should only contain valid hex digits [0-9a-fA-F]"
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),
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FromHexError::OddLength => panic!("-Zmiri-seed should have an even number of digits"),
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err => panic!("Unknown error decoding -Zmiri-seed as hex: {:?}", err),
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});
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if seed_raw.len() > 8 {
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panic!(format!("-Zmiri-seed must be at most 8 bytes, was {}", seed_raw.len()));
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}
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let mut bytes = [0; 8];
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bytes[..seed_raw.len()].copy_from_slice(&seed_raw);
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seed = Some(u64::from_be_bytes(bytes));
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},
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arg if arg.starts_with("-Zmiri-env-exclude=") => {
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excluded_env_vars.push(arg.trim_start_matches("-Zmiri-env-exclude=").to_owned());
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},
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_ => {
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rustc_args.push(arg);
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}
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}
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}
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}
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// Determine sysroot if needed. Make sure we always call `compile_time_sysroot`
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// as that also does some sanity-checks of the environment we were built in.
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// FIXME: Ideally we'd turn a bad build env into a compile-time error, but
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// CTFE does not seem powerful enough for that yet.
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if let Some(sysroot) = compile_time_sysroot() {
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let sysroot_flag = "--sysroot";
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if !rustc_args.iter().any(|e| e == sysroot_flag) {
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// We need to overwrite the default that librustc would compute.
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rustc_args.push(sysroot_flag.to_owned());
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rustc_args.push(sysroot);
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}
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}
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// Finally, add the default flags all the way in the beginning, but after the binary name.
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rustc_args.splice(1..1, miri::miri_default_args().iter().map(ToString::to_string));
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debug!("rustc arguments: {:?}", rustc_args);
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debug!("miri arguments: {:?}", miri_args);
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let miri_config = miri::MiriConfig {
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validate,
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communicate,
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excluded_env_vars,
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seed,
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args: miri_args,
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};
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rustc_driver::install_ice_hook();
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let result = rustc_driver::catch_fatal_errors(move || {
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rustc_driver::run_compiler(&rustc_args, &mut MiriCompilerCalls { miri_config }, None, None)
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}).and_then(|result| result);
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std::process::exit(result.is_err() as i32);
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}
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