1 #![feature(inner_deref)]
3 use std::fs::{self, File};
4 use std::io::{self, Write, BufRead};
5 use std::path::{PathBuf, Path};
6 use std::process::Command;
8 const CARGO_MIRI_HELP: &str = r#"Interprets bin crates and tests in Miri
11 cargo miri [subcommand] [options] [--] [<miri opts>...] [--] [<program opts>...]
14 run Run binaries (default)
16 setup Only perform automatic setup, but without asking questions (for getting a proper libstd)
19 -h, --help Print this message
20 --features Features to compile for the package
21 -V, --version Print version info and exit
23 Other [options] are the same as `cargo rustc`. Everything after the first "--" is
24 passed verbatim to Miri, which will pass everything after the second "--" verbatim
25 to the interpreted program.
28 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
36 println!("{}", CARGO_MIRI_HELP);
40 println!("miri {} ({} {})",
41 env!("CARGO_PKG_VERSION"), env!("VERGEN_SHA_SHORT"), env!("VERGEN_COMMIT_DATE"));
44 fn show_error(msg: String) -> ! {
45 eprintln!("fatal error: {}", msg);
49 // Determines whether a `--flag` is present.
50 fn has_arg_flag(name: &str) -> bool {
51 let mut args = std::env::args().take_while(|val| val != "--");
52 args.any(|val| val == name)
55 /// Gets the value of a `--flag`.
56 fn get_arg_flag_value(name: &str) -> Option<String> {
57 // Stop searching at `--`.
58 let mut args = std::env::args().take_while(|val| val != "--");
60 let arg = match args.next() {
64 if !arg.starts_with(name) {
67 // Strip leading `name`.
68 let suffix = &arg[name.len()..];
69 if suffix.is_empty() {
70 // This argument is exactly `name`; the next one is the value.
72 } else if suffix.starts_with('=') {
73 // This argument is `name=value`; get the value.
75 return Some(suffix[1..].to_owned());
80 fn list_targets() -> impl Iterator<Item=cargo_metadata::Target> {
81 // We need to get the manifest, and then the metadata, to enumerate targets.
82 let manifest_path = get_arg_flag_value("--manifest-path").map(|m|
83 Path::new(&m).canonicalize().unwrap()
86 let mut cmd = cargo_metadata::MetadataCommand::new();
87 if let Some(ref manifest_path) = manifest_path {
88 cmd.manifest_path(manifest_path);
90 let mut metadata = if let Ok(metadata) = cmd.exec() {
93 show_error(format!("Could not obtain Cargo metadata"));
96 let current_dir = std::env::current_dir();
98 let package_index = metadata
101 .position(|package| {
102 let package_manifest_path = Path::new(&package.manifest_path);
103 if let Some(ref manifest_path) = manifest_path {
104 package_manifest_path == manifest_path
106 let current_dir = current_dir.as_ref().expect(
107 "could not read current directory",
109 let package_manifest_directory = package_manifest_path.parent().expect(
110 "could not find parent directory of package manifest",
112 package_manifest_directory == current_dir
115 .expect("could not find matching package");
116 let package = metadata.packages.remove(package_index);
118 // Finally we got the list of targets to build
119 package.targets.into_iter()
122 /// Returns the path to the `miri` binary
123 fn find_miri() -> PathBuf {
124 let mut path = std::env::current_exe().expect("current executable path invalid");
125 path.set_file_name("miri");
129 /// Make sure that the `miri` and `rustc` binary are from the same sysroot.
130 /// This can be violated e.g. when miri is locally built and installed with a different
131 /// toolchain than what is used when `cargo miri` is run.
132 fn test_sysroot_consistency() {
133 fn get_sysroot(mut cmd: Command) -> PathBuf {
134 let out = cmd.arg("--print").arg("sysroot")
135 .output().expect("Failed to run rustc to get sysroot info");
136 let stdout = String::from_utf8(out.stdout).expect("stdout is not valid UTF-8");
137 let stderr = String::from_utf8(out.stderr).expect("stderr is not valid UTF-8");
138 let stdout = stdout.trim();
139 assert!(out.status.success(), "Bad status code when getting sysroot info.\nstdout:\n{}\nstderr:\n{}", stdout, stderr);
140 PathBuf::from(stdout).canonicalize()
141 .unwrap_or_else(|_| panic!("Failed to canonicalize sysroot: {}", stdout))
144 // We let the user skip this check if they really want to.
145 // (`bootstrap` needs this because Miri gets built by the stage1 compiler
146 // but run with the stage2 sysroot.)
147 if std::env::var("MIRI_SKIP_SYSROOT_CHECK").is_ok() {
151 let rustc_sysroot = get_sysroot(Command::new("rustc"));
152 let miri_sysroot = get_sysroot(Command::new(find_miri()));
154 if rustc_sysroot != miri_sysroot {
156 "miri was built for a different sysroot than the rustc in your current toolchain.\n\
157 Make sure you use the same toolchain to run miri that you used to build it!\n\
158 rustc sysroot: `{}`\n\
160 rustc_sysroot.display(), miri_sysroot.display()
165 fn cargo() -> Command {
166 if let Ok(val) = std::env::var("CARGO") {
167 // Bootstrap tells us where to find cargo
170 Command::new("cargo")
174 fn xargo() -> Command {
175 if let Ok(val) = std::env::var("XARGO") {
176 // Bootstrap tells us where to find xargo
179 Command::new("xargo")
183 fn xargo_version() -> Option<(u32, u32, u32)> {
184 let out = xargo().arg("--version").output().ok()?;
185 if !out.status.success() {
188 // Parse output. The first line looks like "xargo 0.3.12 (b004f1c 2018-12-13)".
189 let line = out.stderr.lines().nth(0)
190 .expect("malformed `xargo --version` output: not at least one line")
191 .expect("malformed `xargo --version` output: error reading first line");
192 let (name, version) = {
193 let mut split = line.split(' ');
194 (split.next().expect("malformed `xargo --version` output: empty"),
195 split.next().expect("malformed `xargo --version` output: not at least two words"))
198 // This is some fork of xargo
201 let mut version_pieces = version.split('.');
202 let major = version_pieces.next()
203 .expect("malformed `xargo --version` output: not a major version piece")
205 .expect("malformed `xargo --version` output: major version is not an integer");
206 let minor = version_pieces.next()
207 .expect("malformed `xargo --version` output: not a minor version piece")
209 .expect("malformed `xargo --version` output: minor version is not an integer");
210 let patch = version_pieces.next()
211 .expect("malformed `xargo --version` output: not a patch version piece")
213 .expect("malformed `xargo --version` output: patch version is not an integer");
214 if !version_pieces.next().is_none() {
215 panic!("malformed `xargo --version` output: more than three pieces in version");
217 Some((major, minor, patch))
220 fn ask(question: &str) {
221 let mut buf = String::new();
222 print!("{} [Y/n] ", question);
223 io::stdout().flush().unwrap();
224 io::stdin().read_line(&mut buf).unwrap();
225 match buf.trim().to_lowercase().as_ref() {
227 "" | "y" | "yes" => {},
228 "n" | "no" => show_error(format!("Aborting as per your request")),
229 a => show_error(format!("I do not understand `{}`", a))
233 /// Performs the setup required to make `cargo miri` work: Getting a custom-built libstd. Then sets
234 /// `MIRI_SYSROOT`. Skipped if `MIRI_SYSROOT` is already set, in which case we expect the user has
235 /// done all this already.
236 fn setup(ask_user: bool) {
237 if std::env::var("MIRI_SYSROOT").is_ok() {
239 println!("WARNING: MIRI_SYSROOT already set, not doing anything.")
244 // First, we need xargo.
245 if xargo_version().map_or(true, |v| v < (0, 3, 14)) {
247 ask("It seems you do not have a recent enough xargo installed. I will run `cargo install xargo -f`. Proceed?");
249 println!("Installing xargo: `cargo install xargo -f`");
252 if !cargo().args(&["install", "xargo", "-f"]).status()
253 .expect("failed to install xargo")
256 show_error(format!("Failed to install xargo"));
260 // Then, unless `XARGO_RUST_SRC` is set, we also need rust-src.
261 // Let's see if it is already installed.
262 if std::env::var("XARGO_RUST_SRC").is_err() {
263 let sysroot = Command::new("rustc").args(&["--print", "sysroot"]).output()
264 .expect("failed to get rustc sysroot")
266 let sysroot = std::str::from_utf8(&sysroot).unwrap();
267 let src = Path::new(sysroot.trim_end_matches('\n')).join("lib").join("rustlib").join("src");
270 ask("It seems you do not have the rust-src component installed. I will run `rustup component add rust-src`. Proceed?");
272 println!("Installing rust-src component: `rustup component add rust-src`");
274 if !Command::new("rustup").args(&["component", "add", "rust-src"]).status()
275 .expect("failed to install rust-src component")
278 show_error(format!("Failed to install rust-src component"));
283 // Next, we need our own libstd. We will do this work in whatever is a good cache dir for this platform.
284 let dirs = directories::ProjectDirs::from("org", "rust-lang", "miri").unwrap();
285 let dir = dirs.cache_dir();
287 fs::create_dir_all(&dir).unwrap();
289 // The interesting bit: Xargo.toml
290 File::create(dir.join("Xargo.toml")).unwrap()
293 default_features = false
294 # We need the `panic_unwind` feature because we use the `unwind` panic strategy.
295 # Using `abort` works for libstd, but then libtest will not compile.
296 features = ["panic_unwind"]
301 // The boring bits: a dummy project for xargo.
302 File::create(dir.join("Cargo.toml")).unwrap()
306 description = "A dummy project for building libstd with xargo."
312 File::create(dir.join("lib.rs")).unwrap();
313 // Prepare xargo invocation.
314 let target = get_arg_flag_value("--target");
315 let print_env = !ask_user && has_arg_flag("--env"); // whether we just print the necessary environment variable
316 let mut command = xargo();
317 command.arg("build").arg("-q");
318 command.current_dir(&dir);
319 command.env("RUSTFLAGS", miri::miri_default_args().join(" "));
320 command.env("XARGO_HOME", dir.to_str().unwrap());
321 // In bootstrap, make sure we don't get debug assertons into our libstd.
322 command.env("RUSTC_DEBUG_ASSERTIONS", "false");
323 // Handle target flag.
324 if let Some(ref target) = target {
325 command.arg("--target").arg(&target);
329 .expect("failed to run xargo")
332 show_error(format!("Failed to run xargo"));
335 // That should be it! But we need to figure out where xargo built stuff.
336 // Unfortunately, it puts things into a different directory when the
337 // architecture matches the host.
338 let is_host = match target {
340 Some(target) => target == rustc_version::version_meta().unwrap().host,
342 let sysroot = if is_host { dir.join("HOST") } else { PathBuf::from(dir) };
343 std::env::set_var("MIRI_SYSROOT", &sysroot); // pass the env var to the processes we spawn, which will turn it into "--sysroot" flags
345 println!("MIRI_SYSROOT={}", sysroot.display());
346 } else if !ask_user {
347 println!("A libstd for Miri is now available in `{}`.", sysroot.display());
352 // Check for version and help flags even when invoked as `cargo-miri`.
353 if std::env::args().any(|a| a == "--help" || a == "-h") {
357 if std::env::args().any(|a| a == "--version" || a == "-V") {
362 if let Some("miri") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
363 // This arm is for when `cargo miri` is called. We call `cargo rustc` for each applicable target,
364 // but with the `RUSTC` env var set to the `cargo-miri` binary so that we come back in the other branch,
365 // and dispatch the invocations to `rustc` and `miri`, respectively.
367 } else if let Some("rustc") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
368 // This arm is executed when `cargo-miri` runs `cargo rustc` with the `RUSTC_WRAPPER` env var set to itself:
369 // dependencies get dispatched to `rustc`, the final test/binary to `miri`.
370 inside_cargo_rustc();
372 show_error(format!("must be called with either `miri` or `rustc` as first argument."))
377 let (subcommand, skip) = match std::env::args().nth(2).as_deref() {
378 Some("test") => (MiriCommand::Test, 3),
379 Some("run") => (MiriCommand::Run, 3),
380 Some("setup") => (MiriCommand::Setup, 3),
381 // Default command, if there is an option or nothing.
382 Some(s) if s.starts_with("-") => (MiriCommand::Run, 2),
383 None => (MiriCommand::Run, 2),
386 show_error(format!("Unknown command `{}`", s))
389 let verbose = has_arg_flag("-v");
391 // Some basic sanity checks
392 test_sysroot_consistency();
395 let ask = subcommand != MiriCommand::Setup;
397 if subcommand == MiriCommand::Setup {
402 // Now run the command.
403 for target in list_targets() {
404 let mut args = std::env::args().skip(skip);
405 let kind = target.kind.get(0).expect(
406 "badly formatted cargo metadata: target::kind is an empty array",
408 // Now we run `cargo rustc $FLAGS $ARGS`, giving the user the
409 // change to add additional arguments. `FLAGS` is set to identify
410 // this target. The user gets to control what gets actually passed to Miri.
411 let mut cmd = cargo();
413 match (subcommand, kind.as_str()) {
414 (MiriCommand::Run, "bin") => {
415 // FIXME: we just run all the binaries here.
416 // We should instead support `cargo miri --bin foo`.
417 cmd.arg("--bin").arg(target.name);
419 (MiriCommand::Test, "test") => {
420 cmd.arg("--test").arg(target.name);
422 (MiriCommand::Test, "lib") => {
423 // There can be only one lib.
424 cmd.arg("--lib").arg("--profile").arg("test");
426 (MiriCommand::Test, "bin") => {
427 cmd.arg("--bin").arg(target.name).arg("--profile").arg("test");
429 // The remaining targets we do not even want to build.
432 // Add user-defined args until first `--`.
433 while let Some(arg) = args.next() {
439 // Add `--` (to end the `cargo` flags), and then the user flags. We add markers around the
440 // user flags to be able to identify them later. "cargo rustc" adds more stuff after this,
441 // so we have to mark both the beginning and the end.
444 .arg("cargo-miri-marker-begin")
446 .arg("cargo-miri-marker-end");
447 let path = std::env::current_exe().expect("current executable path invalid");
448 cmd.env("RUSTC_WRAPPER", path);
450 eprintln!("+ {:?}", cmd);
453 let exit_status = cmd
455 .expect("could not run cargo")
457 .expect("failed to wait for cargo?");
459 if !exit_status.success() {
460 std::process::exit(exit_status.code().unwrap_or(-1))
465 fn inside_cargo_rustc() {
466 let sysroot = std::env::var("MIRI_SYSROOT").expect("The wrapper should have set MIRI_SYSROOT");
468 let rustc_args = std::env::args().skip(2); // skip `cargo rustc`
469 let mut args: Vec<String> = rustc_args
470 .chain(Some("--sysroot".to_owned()))
471 .chain(Some(sysroot))
473 args.splice(0..0, miri::miri_default_args().iter().map(ToString::to_string));
475 // See if we can find the `cargo-miri` markers. Those only get added to the binary we want to
476 // run. They also serve to mark the user-defined arguments, which we have to move all the way
477 // to the end (they get added somewhere in the middle).
478 let needs_miri = if let Some(begin) = args.iter().position(|arg| arg == "cargo-miri-marker-begin") {
481 .position(|arg| arg == "cargo-miri-marker-end")
482 .expect("cannot find end marker");
483 // These mark the user arguments. We remove the first and last as they are the markers.
484 let mut user_args = args.drain(begin..=end);
485 assert_eq!(user_args.next().unwrap(), "cargo-miri-marker-begin");
486 assert_eq!(user_args.next_back().unwrap(), "cargo-miri-marker-end");
487 // Collect the rest and add it back at the end.
488 let mut user_args = user_args.collect::<Vec<String>>();
489 args.append(&mut user_args);
496 let mut command = if needs_miri {
497 Command::new(find_miri())
499 Command::new("rustc")
502 if has_arg_flag("-v") {
503 eprintln!("+ {:?}", command);
506 match command.status() {
509 std::process::exit(exit.code().unwrap_or(42));
512 Err(ref e) if needs_miri => panic!("error during miri run: {:?}", e),
513 Err(ref e) => panic!("error during rustc call: {:?}", e),