rust/cargo-miri/bin.rs

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use std::env;
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use std::ffi::OsString;
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use std::fs::{self, File};
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use std::iter::TakeWhile;
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use std::io::{self, BufRead, BufReader, BufWriter, Read, Write};
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use std::ops::Not;
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use std::path::{Path, PathBuf};
use std::process::Command;
use std::fmt::{Write as _};
use serde::{Deserialize, Serialize};
use rustc_version::VersionMeta;
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const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 22);
const CARGO_MIRI_HELP: &str = r#"Runs binary crates and tests in Miri
Usage:
cargo miri [subcommand] [<cargo options>...] [--] [<program/test suite options>...]
Subcommands:
run Run binaries
test Run tests
setup Only perform automatic setup, but without asking questions (for getting a proper libstd)
The cargo options are exactly the same as for `cargo run` and `cargo test`, respectively.
Examples:
cargo miri run
cargo miri test -- test-suite-filter
"#;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
enum MiriCommand {
Run,
Test,
Setup,
}
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/// The information to run a crate with the given environment.
#[derive(Serialize, Deserialize)]
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struct CrateRunEnv {
/// The command-line arguments.
args: Vec<String>,
/// The environment.
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env: Vec<(OsString, OsString)>,
/// The current working directory.
current_dir: OsString,
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/// The contents passed via standard input.
stdin: Vec<u8>,
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}
impl CrateRunEnv {
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/// Gather all the information we need.
fn collect(args: env::Args, capture_stdin: bool) -> Self {
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let args = args.collect();
let env = env::vars_os().collect();
let current_dir = env::current_dir().unwrap().into_os_string();
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let mut stdin = Vec::new();
if capture_stdin {
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std::io::stdin().lock().read_to_end(&mut stdin).expect("cannot read stdin");
}
CrateRunEnv { args, env, current_dir, stdin }
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}
}
/// The information Miri needs to run a crate. Stored as JSON when the crate is "compiled".
#[derive(Serialize, Deserialize)]
enum CrateRunInfo {
/// Run it with the given environment.
RunWith(CrateRunEnv),
/// Skip it as Miri does not support interpreting such kind of crates.
SkipProcMacroTest,
}
impl CrateRunInfo {
fn store(&self, filename: &Path) {
let file = File::create(filename)
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.unwrap_or_else(|_| show_error(format!("cannot create `{}`", filename.display())));
let file = BufWriter::new(file);
serde_json::ser::to_writer(file, self)
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.unwrap_or_else(|_| show_error(format!("cannot write to `{}`", filename.display())));
}
}
fn show_help() {
println!("{}", CARGO_MIRI_HELP);
}
fn show_version() {
let mut version = format!("miri {}", env!("CARGO_PKG_VERSION"));
// Only use `option_env` on vergen variables to ensure the build succeeds
// when vergen failed to find the git info.
if let Some(sha) = option_env!("VERGEN_GIT_SHA_SHORT") {
write!(&mut version, " ({} {})", sha, option_env!("VERGEN_GIT_COMMIT_DATE").unwrap()).unwrap();
}
println!("{}", version);
}
fn show_error(msg: String) -> ! {
eprintln!("fatal error: {}", msg);
std::process::exit(1)
}
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// Determines whether a `--flag` is present.
fn has_arg_flag(name: &str) -> bool {
let mut args = std::env::args().take_while(|val| val != "--");
args.any(|val| val == name)
}
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/// Yields all values of command line flag `name`.
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struct ArgFlagValueIter<'a> {
args: TakeWhile<env::Args, fn(&String) -> bool>,
name: &'a str,
}
impl<'a> ArgFlagValueIter<'a> {
fn new(name: &'a str) -> Self {
Self {
// Stop searching at `--`.
args: env::args().take_while(|val| val != "--"),
name,
}
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}
}
impl Iterator for ArgFlagValueIter<'_> {
type Item = String;
fn next(&mut self) -> Option<Self::Item> {
loop {
let arg = self.args.next()?;
if !arg.starts_with(self.name) {
continue;
}
// Strip leading `name`.
let suffix = &arg[self.name.len()..];
if suffix.is_empty() {
// This argument is exactly `name`; the next one is the value.
return self.args.next();
} else if suffix.starts_with('=') {
// This argument is `name=value`; get the value.
// Strip leading `=`.
return Some(suffix[1..].to_owned());
}
}
}
}
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/// Gets the value of a `--flag`.
fn get_arg_flag_value(name: &str) -> Option<String> {
ArgFlagValueIter::new(name).next()
}
fn forward_patched_extern_arg(args: &mut impl Iterator<Item = String>, cmd: &mut Command) {
cmd.arg("--extern"); // always forward flag, but adjust filename:
let path = args.next().expect("`--extern` should be followed by a filename");
if let Some(lib) = path.strip_suffix(".rlib") {
// If this is an rlib, make it an rmeta.
cmd.arg(format!("{}.rmeta", lib));
} else {
// Some other extern file (e.g. a `.so`). Forward unchanged.
cmd.arg(path);
}
}
fn forward_miri_sysroot(cmd: &mut Command) {
let sysroot =
env::var_os("MIRI_SYSROOT").expect("the wrapper should have set MIRI_SYSROOT");
cmd.arg("--sysroot");
cmd.arg(sysroot);
}
/// Returns the path to the `miri` binary
fn find_miri() -> PathBuf {
if let Some(path) = env::var_os("MIRI") {
return path.into();
}
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let mut path = std::env::current_exe().expect("current executable path invalid");
path.set_file_name("miri");
path
}
fn miri() -> Command {
Command::new(find_miri())
}
fn version_info() -> VersionMeta {
VersionMeta::for_command(miri()).expect("failed to determine underlying rustc version of Miri")
}
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fn cargo() -> Command {
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Command::new(env::var_os("CARGO").unwrap_or_else(|| OsString::from("cargo")))
}
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fn xargo_check() -> Command {
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Command::new(env::var_os("XARGO_CHECK").unwrap_or_else(|| OsString::from("xargo-check")))
}
/// Execute the command. If it fails, fail this process with the same exit code.
/// Otherwise, continue.
fn exec(mut cmd: Command) {
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let exit_status = cmd.status().expect("failed to run command");
if exit_status.success().not() {
std::process::exit(exit_status.code().unwrap_or(-1))
}
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}
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/// Execute the command and pipe `input` into its stdin.
/// If it fails, fail this process with the same exit code.
/// Otherwise, continue.
fn exec_with_pipe(mut cmd: Command, input: &[u8]) {
cmd.stdin(std::process::Stdio::piped());
let mut child = cmd.spawn().expect("failed to spawn process");
{
let stdin = child.stdin.as_mut().expect("failed to open stdin");
stdin.write_all(input).expect("failed to write out test source");
}
let exit_status = child.wait().expect("failed to run command");
if exit_status.success().not() {
std::process::exit(exit_status.code().unwrap_or(-1))
}
}
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fn xargo_version() -> Option<(u32, u32, u32)> {
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let out = xargo_check().arg("--version").output().ok()?;
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if !out.status.success() {
return None;
}
// Parse output. The first line looks like "xargo 0.3.12 (b004f1c 2018-12-13)".
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let line = out
.stderr
.lines()
.nth(0)
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.expect("malformed `xargo --version` output: not at least one line")
.expect("malformed `xargo --version` output: error reading first line");
let (name, version) = {
let mut split = line.split(' ');
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(
split.next().expect("malformed `xargo --version` output: empty"),
split.next().expect("malformed `xargo --version` output: not at least two words"),
)
};
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if name != "xargo" {
// This is some fork of xargo
return None;
}
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let mut version_pieces = version.split('.');
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let major = version_pieces
.next()
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.expect("malformed `xargo --version` output: not a major version piece")
.parse()
.expect("malformed `xargo --version` output: major version is not an integer");
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let minor = version_pieces
.next()
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.expect("malformed `xargo --version` output: not a minor version piece")
.parse()
.expect("malformed `xargo --version` output: minor version is not an integer");
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let patch = version_pieces
.next()
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.expect("malformed `xargo --version` output: not a patch version piece")
.parse()
.expect("malformed `xargo --version` output: patch version is not an integer");
if !version_pieces.next().is_none() {
panic!("malformed `xargo --version` output: more than three pieces in version");
}
Some((major, minor, patch))
}
fn ask_to_run(mut cmd: Command, ask: bool, text: &str) {
// Disable interactive prompts in CI (GitHub Actions, Travis, AppVeyor, etc).
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// Azure doesn't set `CI` though (nothing to see here, just Microsoft being Microsoft),
// so we also check their `TF_BUILD`.
let is_ci = env::var_os("CI").is_some() || env::var_os("TF_BUILD").is_some();
if ask && !is_ci {
let mut buf = String::new();
print!("I will run `{:?}` to {}. Proceed? [Y/n] ", cmd, text);
io::stdout().flush().unwrap();
io::stdin().read_line(&mut buf).unwrap();
match buf.trim().to_lowercase().as_ref() {
// Proceed.
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"" | "y" | "yes" => {}
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"n" | "no" => show_error(format!("aborting as per your request")),
a => show_error(format!("invalid answer `{}`", a)),
};
} else {
println!("Running `{:?}` to {}.", cmd, text);
}
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if cmd.status().expect(&format!("failed to execute {:?}", cmd)).success().not() {
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show_error(format!("failed to {}", text));
}
}
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/// Performs the setup required to make `cargo miri` work: Getting a custom-built libstd. Then sets
/// `MIRI_SYSROOT`. Skipped if `MIRI_SYSROOT` is already set, in which case we expect the user has
/// done all this already.
fn setup(subcommand: MiriCommand) {
if std::env::var_os("MIRI_SYSROOT").is_some() {
if subcommand == MiriCommand::Setup {
println!("WARNING: MIRI_SYSROOT already set, not doing anything.")
}
return;
}
// Subcommands other than `setup` will do a setup if necessary, but
// interactively confirm first.
let ask_user = subcommand != MiriCommand::Setup;
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// First, we need xargo.
if xargo_version().map_or(true, |v| v < XARGO_MIN_VERSION) {
if std::env::var_os("XARGO_CHECK").is_some() {
// The user manually gave us a xargo binary; don't do anything automatically.
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show_error(format!("xargo is too old; please upgrade to the latest version"))
}
let mut cmd = cargo();
cmd.args(&["install", "xargo"]);
ask_to_run(cmd, ask_user, "install a recent enough xargo");
}
// Determine where the rust sources are located. `XARGO_RUST_SRC` env var trumps everything.
let rust_src = match std::env::var_os("XARGO_RUST_SRC") {
Some(path) => {
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let path = PathBuf::from(path);
// Make path absolute if possible.
path.canonicalize().unwrap_or(path)
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}
None => {
// Check for `rust-src` rustup component.
let sysroot = miri()
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.args(&["--print", "sysroot"])
.output()
.expect("failed to determine sysroot")
.stdout;
let sysroot = std::str::from_utf8(&sysroot).unwrap();
let sysroot = Path::new(sysroot.trim_end_matches('\n'));
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// Check for `$SYSROOT/lib/rustlib/src/rust/library`; test if that contains `std/Cargo.toml`.
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let rustup_src =
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sysroot.join("lib").join("rustlib").join("src").join("rust").join("library");
if !rustup_src.join("std").join("Cargo.toml").exists() {
// Ask the user to install the `rust-src` component, and use that.
let mut cmd = Command::new("rustup");
cmd.args(&["component", "add", "rust-src"]);
ask_to_run(
cmd,
ask_user,
"install the `rust-src` component for the selected toolchain",
);
}
rustup_src
}
};
if !rust_src.exists() {
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show_error(format!("given Rust source directory `{}` does not exist.", rust_src.display()));
}
// Next, we need our own libstd. Prepare a xargo project for that purpose.
// We will do this work in whatever is a good cache dir for this platform.
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let dirs = directories::ProjectDirs::from("org", "rust-lang", "miri").unwrap();
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let dir = dirs.cache_dir();
if !dir.exists() {
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fs::create_dir_all(&dir).unwrap();
}
// The interesting bit: Xargo.toml
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File::create(dir.join("Xargo.toml"))
.unwrap()
.write_all(
br#"
[dependencies.std]
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default_features = false
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# We support unwinding, so enable that panic runtime.
features = ["panic_unwind", "backtrace"]
[dependencies.test]
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"#,
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)
.unwrap();
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// The boring bits: a dummy project for xargo.
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// FIXME: With xargo-check, can we avoid doing this?
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File::create(dir.join("Cargo.toml"))
.unwrap()
.write_all(
br#"
[package]
name = "miri-xargo"
description = "A dummy project for building libstd with xargo."
version = "0.0.0"
[lib]
path = "lib.rs"
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"#,
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)
.unwrap();
File::create(dir.join("lib.rs")).unwrap();
// Determine architectures.
// We always need to set a target so rustc bootstrap can tell apart host from target crates.
let host = version_info().host;
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let target = get_arg_flag_value("--target");
let target = target.as_ref().unwrap_or(&host);
// Now invoke xargo.
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let mut command = xargo_check();
command.arg("check").arg("-q");
command.arg("--target").arg(target);
command.current_dir(&dir);
command.env("XARGO_HOME", &dir);
command.env("XARGO_RUST_SRC", &rust_src);
// Use Miri as rustc to build a libstd compatible with us (and use the right flags).
// However, when we are running in bootstrap, we cannot just overwrite `RUSTC`,
// because we still need bootstrap to distinguish between host and target crates.
// In that case we overwrite `RUSTC_REAL` instead which determines the rustc used
// for target crates.
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// We set ourselves (`cargo-miri`) instead of Miri directly to be able to patch the flags
// for `libpanic_abort` (usually this is done by bootstrap but we have to do it ourselves).
// The `MIRI_CALLED_FROM_XARGO` will mean we dispatch to `phase_setup_rustc`.
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let cargo_miri_path = std::env::current_exe().expect("current executable path invalid");
if env::var_os("RUSTC_STAGE").is_some() {
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command.env("RUSTC_REAL", &cargo_miri_path);
} else {
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command.env("RUSTC", &cargo_miri_path);
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}
command.env("MIRI_CALLED_FROM_XARGO", "1");
// Make sure there are no other wrappers or flags getting in our way
// (Cc https://github.com/rust-lang/miri/issues/1421).
// This is consistent with normal `cargo build` that does not apply `RUSTFLAGS`
// to the sysroot either.
command.env_remove("RUSTC_WRAPPER");
command.env_remove("RUSTFLAGS");
// Disable debug assertions in the standard library -- Miri is already slow enough.
// But keep the overflow checks, they are cheap.
command.env("RUSTFLAGS", "-Cdebug-assertions=off -Coverflow-checks=on");
// Finally run it!
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if command.status().expect("failed to run xargo").success().not() {
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show_error(format!("failed to run xargo"));
}
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// That should be it! But we need to figure out where xargo built stuff.
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// Unfortunately, it puts things into a different directory when the
// architecture matches the host.
let sysroot = if target == &host { dir.join("HOST") } else { PathBuf::from(dir) };
std::env::set_var("MIRI_SYSROOT", &sysroot); // pass the env var to the processes we spawn, which will turn it into "--sysroot" flags
// Figure out what to print.
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let print_sysroot = subcommand == MiriCommand::Setup && has_arg_flag("--print-sysroot"); // whether we just print the sysroot path
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if print_sysroot {
// Print just the sysroot and nothing else; this way we do not need any escaping.
println!("{}", sysroot.display());
} else if subcommand == MiriCommand::Setup {
println!("A libstd for Miri is now available in `{}`.", sysroot.display());
}
}
fn phase_cargo_miri(mut args: env::Args) {
// Check for version and help flags even when invoked as `cargo-miri`.
if has_arg_flag("--help") || has_arg_flag("-h") {
show_help();
return;
}
if has_arg_flag("--version") || has_arg_flag("-V") {
show_version();
return;
}
// Require a subcommand before any flags.
// We cannot know which of those flags take arguments and which do not,
// so we cannot detect subcommands later.
let subcommand = match args.next().as_deref() {
Some("test") => MiriCommand::Test,
Some("run") => MiriCommand::Run,
Some("setup") => MiriCommand::Setup,
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// Invalid command.
_ => show_error(format!("`cargo miri` supports the following subcommands: `run`, `test`, and `setup`.")),
};
let verbose = has_arg_flag("-v");
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// We always setup.
setup(subcommand);
// Invoke actual cargo for the job, but with different flags.
// We re-use `cargo test` and `cargo run`, which makes target and binary handling very easy but
// requires some extra work to make the build check-only (see all the `--emit` hacks below).
// <https://github.com/rust-lang/miri/pull/1540#issuecomment-693553191> describes an alternative
// approach that uses `cargo check`, making that part easier but target and binary handling
// harder.
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let cargo_miri_path = std::env::current_exe().expect("current executable path invalid");
let cargo_cmd = match subcommand {
MiriCommand::Test => "test",
MiriCommand::Run => "run",
MiriCommand::Setup => return, // `cargo miri setup` stops here.
};
let mut cmd = cargo();
cmd.arg(cargo_cmd);
// Make sure we know the build target, and cargo does, too.
// This is needed to make the `CARGO_TARGET_*_RUNNER` env var do something,
// and it later helps us detect which crates are proc-macro/build-script
// (host crates) and which crates are needed for the program itself.
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let host = version_info().host;
let target = get_arg_flag_value("--target");
let target = if let Some(ref target) = target {
target
} else {
// No target given. Pick default and tell cargo about it.
cmd.arg("--target");
cmd.arg(&host);
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&host
};
// Forward all further arguments to cargo.
cmd.args(args);
// Set `RUSTC_WRAPPER` to ourselves. Cargo will prepend that binary to its usual invocation,
// i.e., the first argument is `rustc` -- which is what we use in `main` to distinguish
// the two codepaths. (That extra argument is why we prefer this over setting `RUSTC`.)
if env::var_os("RUSTC_WRAPPER").is_some() {
println!("WARNING: Ignoring `RUSTC_WRAPPER` environment variable, Miri does not support wrapping.");
}
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cmd.env("RUSTC_WRAPPER", &cargo_miri_path);
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let runner_env_name = |triple: &str| {
format!("CARGO_TARGET_{}_RUNNER", triple.to_uppercase().replace('-', "_"))
};
let host_runner_env_name = runner_env_name(&host);
let target_runner_env_name = runner_env_name(target);
// Set the target runner to us, so we can interpret the binaries.
cmd.env(&target_runner_env_name, &cargo_miri_path);
// Unit tests of `proc-macro` crates are run on the host, so we set the host runner to
// us in order to skip them.
cmd.env(&host_runner_env_name, &cargo_miri_path);
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// Set rustdoc to us as well, so we can run doctests.
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cmd.env("RUSTDOC", &cargo_miri_path);
// Run cargo.
if verbose {
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eprintln!("[cargo-miri miri] RUSTC_WRAPPER={:?}", cargo_miri_path);
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eprintln!("[cargo-miri miri] {}={:?}", target_runner_env_name, cargo_miri_path);
if *target != host {
eprintln!("[cargo-miri miri] {}={:?}", host_runner_env_name, cargo_miri_path);
}
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eprintln!("[cargo-miri miri] RUSTDOC={:?}", cargo_miri_path);
eprintln!("[cargo-miri miri] {:?}", cmd);
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cmd.env("MIRI_VERBOSE", ""); // This makes the other phases verbose.
}
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exec(cmd)
}
#[derive(Debug, Copy, Clone, PartialEq)]
enum RustcPhase {
/// `rustc` called via `xargo` for sysroot build.
Setup,
/// `rustc` called by `cargo` for regular build.
Build,
/// `rustc` called by `rustdoc` for doctest.
Rustdoc,
}
fn phase_rustc(mut args: env::Args, phase: RustcPhase) {
/// Determines if we are being invoked (as rustc) to build a crate for
/// the "target" architecture, in contrast to the "host" architecture.
/// Host crates are for build scripts and proc macros and still need to
/// be built like normal; target crates need to be built for or interpreted
/// by Miri.
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///
/// Currently, we detect this by checking for "--target=", which is
/// never set for host crates. This matches what rustc bootstrap does,
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/// which hopefully makes it "reliable enough". This relies on us always
/// invoking cargo itself with `--target`, which `in_cargo_miri` ensures.
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fn is_target_crate() -> bool {
get_arg_flag_value("--target").is_some()
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}
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/// Returns whether or not Cargo invoked the wrapper (this binary) to compile
/// the final, binary crate (either a test for 'cargo test', or a binary for 'cargo run')
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/// Cargo does not give us this information directly, so we need to check
/// various command-line flags.
fn is_runnable_crate() -> bool {
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let is_bin = get_arg_flag_value("--crate-type").as_deref().unwrap_or("bin") == "bin";
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let is_test = has_arg_flag("--test");
is_bin || is_test
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}
fn out_filename(prefix: &str, suffix: &str) -> PathBuf {
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if let Some(out_dir) = get_arg_flag_value("--out-dir") {
let mut path = PathBuf::from(out_dir);
path.push(format!(
"{}{}{}{}",
prefix,
get_arg_flag_value("--crate-name").unwrap(),
// This is technically a `-C` flag but the prefix seems unique enough...
// (and cargo passes this before the filename so it should be unique)
get_arg_flag_value("extra-filename").unwrap_or(String::new()),
suffix,
));
path
} else {
let out_file = get_arg_flag_value("-o").unwrap();
PathBuf::from(out_file)
}
}
let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
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let target_crate = is_target_crate();
let print = get_arg_flag_value("--print").is_some() || has_arg_flag("-vV"); // whether this is cargo/xargo invoking rustc to get some infos
let store_json = |info: CrateRunInfo| {
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// Create a stub .d file to stop Cargo from "rebuilding" the crate:
// https://github.com/rust-lang/miri/issues/1724#issuecomment-787115693
// As we store a JSON file instead of building the crate here, an empty file is fine.
let dep_info_name = out_filename("", ".d");
if verbose {
eprintln!("[cargo-miri rustc] writing stub dep-info to `{}`", dep_info_name.display());
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}
File::create(dep_info_name).expect("failed to create fake .d file");
let filename = out_filename("", "");
if verbose {
eprintln!("[cargo-miri rustc] writing run info to `{}`", filename.display());
}
info.store(&filename);
// For Windows, do the same thing again with `.exe` appended to the filename.
// (Need to do this here as cargo moves that "binary" to a different place before running it.)
info.store(&out_filename("", ".exe"));
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};
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let runnable_crate = !print && is_runnable_crate();
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if runnable_crate && target_crate {
assert!(phase != RustcPhase::Setup, "there should be no interpretation during sysroot build");
let inside_rustdoc = phase == RustcPhase::Rustdoc;
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// This is the binary or test crate that we want to interpret under Miri.
// But we cannot run it here, as cargo invoked us as a compiler -- our stdin and stdout are not
// like we want them.
// Instead of compiling, we write JSON into the output file with all the relevant command-line flags
// and environment variables; this is used when cargo calls us again in the CARGO_TARGET_RUNNER phase.
let env = CrateRunEnv::collect(args, inside_rustdoc);
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// Rustdoc expects us to exit with an error code if the test is marked as `compile_fail`,
// just creating the JSON file is not enough: we need to detect syntax errors,
// so we need to run Miri with `MIRI_BE_RUSTC` for a check-only build.
if inside_rustdoc {
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let mut cmd = miri();
// Ensure --emit argument for a check-only build is present.
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// We cannot use the usual helpers since we need to check specifically in `env.args`.
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if let Some(i) = env.args.iter().position(|arg| arg.starts_with("--emit=")) {
// For `no_run` tests, rustdoc passes a `--emit` flag; make sure it has the right shape.
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assert_eq!(env.args[i], "--emit=metadata");
} else {
// For all other kinds of tests, we can just add our flag.
cmd.arg("--emit=metadata");
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}
cmd.args(&env.args);
cmd.env("MIRI_BE_RUSTC", "target");
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if verbose {
eprintln!("[cargo-miri rustc] captured input:\n{}", std::str::from_utf8(&env.stdin).unwrap());
eprintln!("[cargo-miri rustc] {:?}", cmd);
}
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exec_with_pipe(cmd, &env.stdin);
}
store_json(CrateRunInfo::RunWith(env));
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return;
}
if runnable_crate && ArgFlagValueIter::new("--extern").any(|krate| krate == "proc_macro") {
// This is a "runnable" `proc-macro` crate (unit tests). We do not support
// interpreting that under Miri now, so we write a JSON file to (display a
// helpful message and) skip it in the runner phase.
store_json(CrateRunInfo::SkipProcMacroTest);
return;
}
let mut cmd = miri();
let mut emit_link_hack = false;
// Arguments are treated very differently depending on whether this crate is
// for interpretation by Miri, or for use by a build script / proc macro.
if !print && target_crate {
// Forward arguments, but remove "link" from "--emit" to make this a check-only build.
let emit_flag = "--emit";
while let Some(arg) = args.next() {
if arg.starts_with(emit_flag) {
// Patch this argument. First, extract its value.
let val = &arg[emit_flag.len()..];
assert!(val.starts_with("="), "`cargo` should pass `--emit=X` as one argument");
let val = &val[1..];
let mut val: Vec<_> = val.split(',').collect();
// Now make sure "link" is not in there, but "metadata" is.
if let Some(i) = val.iter().position(|&s| s == "link") {
emit_link_hack = true;
val.remove(i);
if !val.iter().any(|&s| s == "metadata") {
val.push("metadata");
}
}
cmd.arg(format!("{}={}", emit_flag, val.join(",")));
} else if arg == "--extern" {
// Patch `--extern` filenames, since Cargo sometimes passes stub `.rlib` files:
// https://github.com/rust-lang/miri/issues/1705
forward_patched_extern_arg(&mut args, &mut cmd);
} else {
cmd.arg(arg);
}
}
// Use our custom sysroot (but not if that is what we are currently building).
if phase != RustcPhase::Setup {
forward_miri_sysroot(&mut cmd);
}
// During setup, patch the panic runtime for `libpanic_abort` (mirroring what bootstrap usually does).
if phase == RustcPhase::Setup && get_arg_flag_value("--crate-name").as_deref() == Some("panic_abort") {
cmd.arg("-C").arg("panic=abort");
}
} else {
// For host crates or when we are printing, just forward everything.
cmd.args(args);
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}
// We want to compile, not interpret. We still use Miri to make sure the compiler version etc
// are the exact same as what is used for interpretation.
// MIRI_DEFAULT_ARGS should not be used to build host crates, hence setting "target" or "host"
// as the value here to help Miri differentiate them.
cmd.env("MIRI_BE_RUSTC", if target_crate { "target" } else { "host" });
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// Run it.
if verbose {
eprintln!("[cargo-miri rustc] {:?}", cmd);
}
exec(cmd);
// Create a stub .rlib file if "link" was requested by cargo.
// This is necessary to prevent cargo from doing rebuilds all the time.
if emit_link_hack {
// Some platforms prepend "lib", some do not... let's just create both files.
File::create(out_filename("lib", ".rlib")).expect("failed to create fake .rlib file");
File::create(out_filename("", ".rlib")).expect("failed to create fake .rlib file");
// Just in case this is a cdylib or staticlib, also create those fake files.
File::create(out_filename("lib", ".so")).expect("failed to create fake .so file");
File::create(out_filename("lib", ".a")).expect("failed to create fake .a file");
File::create(out_filename("lib", ".dylib")).expect("failed to create fake .dylib file");
File::create(out_filename("", ".dll")).expect("failed to create fake .dll file");
File::create(out_filename("", ".lib")).expect("failed to create fake .lib file");
}
}
#[derive(Debug, Copy, Clone, PartialEq)]
enum RunnerPhase {
/// `cargo` is running a binary
Cargo,
/// `rustdoc` is running a binary
Rustdoc,
}
fn phase_runner(binary: &Path, binary_args: env::Args, phase: RunnerPhase) {
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let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
let file = File::open(&binary)
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.unwrap_or_else(|_| show_error(format!("file {:?} not found or `cargo-miri` invoked incorrectly; please only invoke this binary through `cargo miri`", binary)));
let file = BufReader::new(file);
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let info = serde_json::from_reader(file)
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.unwrap_or_else(|_| show_error(format!("file {:?} contains outdated or invalid JSON; try `cargo clean`", binary)));
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let info = match info {
CrateRunInfo::RunWith(info) => info,
CrateRunInfo::SkipProcMacroTest => {
eprintln!("Running unit tests of `proc-macro` crates is not currently supported by Miri.");
return;
}
};
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let mut cmd = miri();
// Set missing env vars. We prefer build-time env vars over run-time ones; see
// <https://github.com/rust-lang/miri/issues/1661> for the kind of issue that fixes.
for (name, val) in info.env {
if verbose {
if let Some(old_val) = env::var_os(&name) {
if old_val != val {
eprintln!("[cargo-miri runner] Overwriting run-time env var {:?}={:?} with build-time value {:?}", name, old_val, val);
}
}
}
cmd.env(name, val);
}
// Forward rustc arguments.
// We need to patch "--extern" filenames because we forced a check-only
// build without cargo knowing about that: replace `.rlib` suffix by
// `.rmeta`.
// We also need to remove `--error-format` as cargo specifies that to be JSON,
// but when we run here, cargo does not interpret the JSON any more. `--json`
// then also nees to be dropped.
let mut args = info.args.into_iter();
let error_format_flag = "--error-format";
let json_flag = "--json";
while let Some(arg) = args.next() {
if arg == "--extern" {
forward_patched_extern_arg(&mut args, &mut cmd);
} else if arg.starts_with(error_format_flag) {
let suffix = &arg[error_format_flag.len()..];
assert!(suffix.starts_with('='));
// Drop this argument.
} else if arg.starts_with(json_flag) {
let suffix = &arg[json_flag.len()..];
assert!(suffix.starts_with('='));
// Drop this argument.
} else {
cmd.arg(arg);
}
}
// Set sysroot (if we are inside rustdoc, we already did that in `phase_cargo_rustdoc`).
if phase != RunnerPhase::Rustdoc {
forward_miri_sysroot(&mut cmd);
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}
// Respect `MIRIFLAGS`.
if let Ok(a) = env::var("MIRIFLAGS") {
// This code is taken from `RUSTFLAGS` handling in cargo.
let args = a
.split(' ')
.map(str::trim)
.filter(|s| !s.is_empty())
.map(str::to_string);
cmd.args(args);
}
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// Then pass binary arguments.
cmd.arg("--");
cmd.args(binary_args);
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// Make sure we use the build-time working directory for interpreting Miri/rustc arguments.
// But then we need to switch to the run-time one, which we instruct Miri do do by setting `MIRI_CWD`.
cmd.current_dir(info.current_dir);
cmd.env("MIRI_CWD", env::current_dir().unwrap());
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// Run it.
if verbose {
eprintln!("[cargo-miri runner] {:?}", cmd);
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}
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match phase {
RunnerPhase::Rustdoc => {
exec_with_pipe(cmd, &info.stdin)
}
RunnerPhase::Cargo => {
exec(cmd)
}
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}
}
fn phase_rustdoc(fst_arg: &str, mut args: env::Args) {
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let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
// phase_cargo_miri sets the RUSTDOC env var to ourselves, so we can't use that here;
// just default to a straight-forward invocation for now:
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let mut cmd = Command::new("rustdoc");
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// Because of the way the main function is structured, we have to take the first argument spearately
// from the rest; to simplify the following argument patching loop, we'll just skip that one.
// This is fine for now, because cargo will never pass --extern arguments in the first position,
// but we should defensively assert that this will work.
let extern_flag = "--extern";
assert!(fst_arg != extern_flag);
cmd.arg(fst_arg);
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let runtool_flag = "--runtool";
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// `crossmode` records if *any* argument matches `runtool_flag`; here we check the first one.
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let mut crossmode = fst_arg == runtool_flag;
while let Some(arg) = args.next() {
if arg == extern_flag {
// Patch --extern arguments to use *.rmeta files, since phase_cargo_rustc only creates stub *.rlib files.
forward_patched_extern_arg(&mut args, &mut cmd);
} else if arg == runtool_flag {
// An existing --runtool flag indicates cargo is running in cross-target mode, which we don't support.
// Note that this is only passed when cargo is run with the unstable -Zdoctest-xcompile flag;
// otherwise, we won't be called as rustdoc at all.
crossmode = true;
break;
} else {
cmd.arg(arg);
}
}
if crossmode {
show_error(format!("cross-interpreting doc-tests is not currently supported by Miri."));
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}
// For each doc-test, rustdoc starts two child processes: first the test is compiled,
// then the produced executable is invoked. We want to reroute both of these to cargo-miri,
// such that the first time we'll enter phase_cargo_rustc, and phase_cargo_runner second.
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//
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// rustdoc invokes the test-builder by forwarding most of its own arguments, which makes
// it difficult to determine when phase_cargo_rustc should run instead of phase_cargo_rustdoc.
// Furthermore, the test code is passed via stdin, rather than a temporary file, so we need
// to let phase_cargo_rustc know to expect that. We'll use this environment variable as a flag:
cmd.env("MIRI_CALLED_FROM_RUSTDOC", "1");
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// The `--test-builder` and `--runtool` arguments are unstable rustdoc features,
// which are disabled by default. We first need to enable them explicitly:
cmd.arg("-Z").arg("unstable-options");
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// rustdoc needs to know the right sysroot.
forward_miri_sysroot(&mut cmd);
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// Make rustdoc call us back.
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let cargo_miri_path = std::env::current_exe().expect("current executable path invalid");
cmd.arg("--test-builder").arg(&cargo_miri_path); // invoked by forwarding most arguments
cmd.arg("--runtool").arg(&cargo_miri_path); // invoked with just a single path argument
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if verbose {
eprintln!("[cargo-miri rustdoc] {:?}", cmd);
}
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exec(cmd)
}
fn main() {
// Rustc does not support non-UTF-8 arguments so we make no attempt either.
// (We do support non-UTF-8 environment variables though.)
let mut args = std::env::args();
// Skip binary name.
args.next().unwrap();
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// Dispatch running as part of sysroot compilation.
if env::var_os("MIRI_CALLED_FROM_XARGO").is_some() {
phase_rustc(args, RustcPhase::Setup);
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return;
}
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// The way rustdoc invokes rustc is indistuingishable from the way cargo invokes rustdoc by the
// arguments alone. `phase_cargo_rustdoc` sets this environment variable to let us disambiguate.
if env::var_os("MIRI_CALLED_FROM_RUSTDOC").is_some() {
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// ...however, we then also see this variable when rustdoc invokes us as the testrunner!
// The runner is invoked as `$runtool ($runtool-arg)* output_file`;
// since we don't specify any runtool-args, and rustdoc supplies multiple arguments to
// the test-builder unconditionally, we can just check the number of remaining arguments:
if args.len() == 1 {
let arg = args.next().unwrap();
let binary = Path::new(&arg);
if binary.exists() {
phase_runner(binary, args, RunnerPhase::Rustdoc);
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} else {
show_error(format!("`cargo-miri` called with non-existing path argument `{}` in rustdoc mode; please invoke this binary through `cargo miri`", arg));
}
} else {
phase_rustc(args, RustcPhase::Rustdoc);
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}
return;
}
// Dispatch to `cargo-miri` phase. There are three phases:
// - When we are called via `cargo miri`, we run as the frontend and invoke the underlying
// cargo. We set RUSTC_WRAPPER and CARGO_TARGET_RUNNER to ourselves.
// - When we are executed due to RUSTC_WRAPPER, we build crates or store the flags of
// binary crates for later interpretation.
// - When we are executed due to CARGO_TARGET_RUNNER, we start interpretation based on the
// flags that were stored earlier.
// On top of that, we are also called as RUSTDOC, but that is just a stub currently.
match args.next().as_deref() {
Some("miri") => phase_cargo_miri(args),
Some("rustc") => phase_rustc(args, RustcPhase::Build),
Some(arg) => {
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// We have to distinguish the "runner" and "rustdoc" cases.
// As runner, the first argument is the binary (a file that should exist, with an absolute path);
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// as rustdoc, the first argument is a flag (`--something`).
let binary = Path::new(arg);
if binary.exists() {
assert!(!arg.starts_with("--")); // not a flag
phase_runner(binary, args, RunnerPhase::Cargo);
} else if arg.starts_with("--") {
phase_rustdoc(arg, args);
} else {
show_error(format!("`cargo-miri` called with unexpected first argument `{}`; please only invoke this binary through `cargo miri`", arg));
}
}
_ => show_error(format!("`cargo-miri` called without first argument; please only invoke this binary through `cargo miri`")),
}
}