2fbc4aa7ca
Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
578 lines
22 KiB
Rust
578 lines
22 KiB
Rust
#![feature(inner_deref)]
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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::io::{self, BufRead, Write};
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use std::ops::Not;
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use std::path::{Path, PathBuf};
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use std::process::Command;
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use rustc_version::VersionMeta;
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const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 20);
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const CARGO_MIRI_HELP: &str = r#"Interprets bin crates and tests in Miri
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Usage:
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cargo miri [subcommand] [<cargo options>...] [--] [<miri options>...] [--] [<program/test suite options>...]
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Subcommands:
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run Run binaries (default)
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test Run tests
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setup Only perform automatic setup, but without asking questions (for getting a proper libstd)
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Common options:
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-h, --help Print this message
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--features Features to compile for the package
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-V, --version Print version info and exit
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Other [options] are the same as `cargo check`. Everything after the first "--" is
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passed verbatim to Miri, which will pass everything after the second "--" verbatim
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to the interpreted program.
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Examples:
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cargo miri run -- -Zmiri-disable-stacked-borrows
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cargo miri test -- -- test-suite-filter
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"#;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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enum MiriCommand {
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Run,
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Test,
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Setup,
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}
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fn show_help() {
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println!("{}", CARGO_MIRI_HELP);
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}
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fn show_version() {
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println!(
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"miri {} ({} {})",
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env!("CARGO_PKG_VERSION"),
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env!("VERGEN_SHA_SHORT"),
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env!("VERGEN_COMMIT_DATE")
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);
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}
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fn show_error(msg: String) -> ! {
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eprintln!("fatal error: {}", msg);
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std::process::exit(1)
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}
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// Determines whether a `--flag` is present.
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fn has_arg_flag(name: &str) -> bool {
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let mut args = std::env::args().take_while(|val| val != "--");
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args.any(|val| val == name)
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}
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/// Gets the value of a `--flag`.
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fn get_arg_flag_value(name: &str) -> Option<String> {
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// Stop searching at `--`.
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let mut args = std::env::args().take_while(|val| val != "--");
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loop {
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let arg = match args.next() {
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Some(arg) => arg,
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None => return None,
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};
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if !arg.starts_with(name) {
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continue;
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}
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// Strip leading `name`.
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let suffix = &arg[name.len()..];
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if suffix.is_empty() {
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// This argument is exactly `name`; the next one is the value.
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return args.next();
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} else if suffix.starts_with('=') {
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// This argument is `name=value`; get the value.
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// Strip leading `=`.
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return Some(suffix[1..].to_owned());
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}
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}
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}
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/// Returns the path to the `miri` binary
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fn find_miri() -> PathBuf {
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if let Some(path) = env::var_os("MIRI") {
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return path.into();
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}
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let mut path = std::env::current_exe().expect("current executable path invalid");
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path.set_file_name("miri");
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path
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}
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fn miri() -> Command {
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Command::new(find_miri())
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}
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fn version_info() -> VersionMeta {
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VersionMeta::for_command(miri()).expect("failed to determine underlying rustc version of Miri")
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}
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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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}
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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")))
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}
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fn list_targets() -> impl Iterator<Item = cargo_metadata::Target> {
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// We need to get the manifest, and then the metadata, to enumerate targets.
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let manifest_path =
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get_arg_flag_value("--manifest-path").map(|m| Path::new(&m).canonicalize().unwrap());
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let mut cmd = cargo_metadata::MetadataCommand::new();
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if let Some(manifest_path) = &manifest_path {
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cmd.manifest_path(manifest_path);
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}
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let mut metadata = if let Ok(metadata) = cmd.exec() {
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metadata
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} else {
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show_error(format!("Could not obtain Cargo metadata; likely an ill-formed manifest"));
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};
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let current_dir = std::env::current_dir();
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let package_index = metadata
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.packages
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.iter()
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.position(|package| {
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let package_manifest_path = Path::new(&package.manifest_path);
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if let Some(manifest_path) = &manifest_path {
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package_manifest_path == manifest_path
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} else {
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let current_dir = current_dir.as_ref().expect("could not read current directory");
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let package_manifest_directory = package_manifest_path
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.parent()
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.expect("could not find parent directory of package manifest");
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package_manifest_directory == current_dir
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}
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})
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.unwrap_or_else(|| {
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show_error(format!(
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"this seems to be a workspace, which is not supported by `cargo miri`.\n\
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Try to `cd` into the crate you want to test, and re-run `cargo miri` there."
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))
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});
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let package = metadata.packages.remove(package_index);
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// Finally we got the list of targets to build
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package.targets.into_iter()
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}
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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() {
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return None;
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}
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// Parse output. The first line looks like "xargo 0.3.12 (b004f1c 2018-12-13)".
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let line = out
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.stderr
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.lines()
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.nth(0)
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.expect("malformed `xargo --version` output: not at least one line")
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.expect("malformed `xargo --version` output: error reading first line");
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let (name, version) = {
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let mut split = line.split(' ');
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(
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split.next().expect("malformed `xargo --version` output: empty"),
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split.next().expect("malformed `xargo --version` output: not at least two words"),
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)
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};
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if name != "xargo" {
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// This is some fork of xargo
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return None;
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}
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let mut version_pieces = version.split('.');
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let major = version_pieces
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.next()
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.expect("malformed `xargo --version` output: not a major version piece")
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.parse()
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.expect("malformed `xargo --version` output: major version is not an integer");
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let minor = version_pieces
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.next()
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.expect("malformed `xargo --version` output: not a minor version piece")
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.parse()
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.expect("malformed `xargo --version` output: minor version is not an integer");
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let patch = version_pieces
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.next()
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.expect("malformed `xargo --version` output: not a patch version piece")
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.parse()
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.expect("malformed `xargo --version` output: patch version is not an integer");
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if !version_pieces.next().is_none() {
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panic!("malformed `xargo --version` output: more than three pieces in version");
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}
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Some((major, minor, patch))
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}
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fn ask_to_run(mut cmd: Command, ask: bool, text: &str) {
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// Disable interactive prompts in CI (GitHub Actions, Travis, AppVeyor, etc).
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if ask && env::var_os("CI").is_none() {
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let mut buf = String::new();
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print!("I will run `{:?}` to {}. Proceed? [Y/n] ", cmd, text);
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io::stdout().flush().unwrap();
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io::stdin().read_line(&mut buf).unwrap();
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match buf.trim().to_lowercase().as_ref() {
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// Proceed.
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"" | "y" | "yes" => {}
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"n" | "no" => show_error(format!("Aborting as per your request")),
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a => show_error(format!("I do not understand `{}`", a)),
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};
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} else {
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println!("Running `{:?}` to {}.", cmd, text);
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}
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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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}
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}
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/// Performs the setup required to make `cargo miri` work: Getting a custom-built libstd. Then sets
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/// `MIRI_SYSROOT`. Skipped if `MIRI_SYSROOT` is already set, in which case we expect the user has
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/// done all this already.
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fn setup(subcommand: MiriCommand) {
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if std::env::var_os("MIRI_SYSROOT").is_some() {
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if subcommand == MiriCommand::Setup {
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println!("WARNING: MIRI_SYSROOT already set, not doing anything.")
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}
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return;
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}
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// Subcommands other than `setup` will do a setup if necessary, but
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// interactively confirm first.
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let ask_user = subcommand != MiriCommand::Setup;
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// First, we need xargo.
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if xargo_version().map_or(true, |v| v < XARGO_MIN_VERSION) {
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if std::env::var_os("XARGO_CHECK").is_some() {
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// The user manually gave us a xargo binary; don't do anything automatically.
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show_error(format!("Your xargo is too old; please upgrade to the latest version"))
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}
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let mut cmd = cargo();
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cmd.args(&["install", "xargo", "-f"]);
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ask_to_run(cmd, ask_user, "install a recent enough xargo");
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}
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// Determine where the rust sources are located. `XARGO_RUST_SRC` env var trumps everything.
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let rust_src = match std::env::var_os("XARGO_RUST_SRC") {
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Some(path) => {
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// Make path absolute, but not via `canonicalize` (which does not work very well on Windows).
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env::current_dir().unwrap().join(path)
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}
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None => {
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// Check for `rust-src` rustup component.
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let sysroot = miri()
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.args(&["--print", "sysroot"])
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.output()
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.expect("failed to determine sysroot")
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.stdout;
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let sysroot = std::str::from_utf8(&sysroot).unwrap();
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let sysroot = Path::new(sysroot.trim_end_matches('\n'));
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// Check for `$SYSROOT/lib/rustlib/src/rust/src`; test if that contains `libstd/lib.rs`.
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let rustup_src =
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sysroot.join("lib").join("rustlib").join("src").join("rust").join("src");
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if !rustup_src.join("libstd").join("lib.rs").exists() {
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// Ask the user to install the `rust-src` component, and use that.
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let mut cmd = Command::new("rustup");
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cmd.args(&["component", "add", "rust-src"]);
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ask_to_run(
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cmd,
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ask_user,
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"install the `rust-src` component for the selected toolchain",
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);
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}
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rustup_src
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}
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};
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if !rust_src.exists() {
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show_error(format!("Given Rust source directory `{}` does not exist.", rust_src.display()));
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}
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// Next, we need our own libstd. Prepare a xargo project for that purpose.
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// 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();
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if !dir.exists() {
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fs::create_dir_all(&dir).unwrap();
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}
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// The interesting bit: Xargo.toml
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File::create(dir.join("Xargo.toml"))
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.unwrap()
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.write_all(
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br#"
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[dependencies.std]
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default_features = false
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# We need the `panic_unwind` feature because we use the `unwind` panic strategy.
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# Using `abort` works for libstd, but then libtest will not compile.
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features = ["panic_unwind"]
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[dependencies.test]
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"#,
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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"))
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.unwrap()
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.write_all(
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br#"
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[package]
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name = "miri-xargo"
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description = "A dummy project for building libstd with xargo."
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version = "0.0.0"
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[lib]
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path = "lib.rs"
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"#,
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)
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.unwrap();
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File::create(dir.join("lib.rs")).unwrap();
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// Determine architectures.
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// We always need to set a target so rustc bootstrap can tell apart host from target crates.
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let host = version_info().host;
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let target = get_arg_flag_value("--target");
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let target = target.as_ref().unwrap_or(&host);
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// Now invoke xargo.
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let mut command = xargo_check();
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command.arg("build").arg("-q");
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command.arg("--target").arg(target);
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command.current_dir(&dir);
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command.env("XARGO_HOME", &dir);
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command.env("XARGO_RUST_SRC", &rust_src);
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// Use Miri as rustc to build a libstd compatible with us (and use the right flags).
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// However, when we are running in bootstrap, we cannot just overwrite `RUSTC`,
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// because we still need bootstrap to distinguish between host and target crates.
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// In that case we overwrite `RUSTC_REAL` instead which determines the rustc used
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// for target crates.
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if env::var_os("RUSTC_STAGE").is_some() {
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command.env("RUSTC_REAL", find_miri());
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} else {
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command.env("RUSTC", find_miri());
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}
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command.env("MIRI_BE_RUSTC", "1");
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// Make sure there are no other wrappers or flags getting in our way
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// (Cc https://github.com/rust-lang/miri/issues/1421).
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// This is consistent with normal `cargo build` that does not apply `RUSTFLAGS`
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// to the sysroot either.
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command.env_remove("RUSTC_WRAPPER");
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command.env_remove("RUSTFLAGS");
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// 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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}
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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
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// architecture matches the host.
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let sysroot = if target == &host { dir.join("HOST") } else { PathBuf::from(dir) };
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std::env::set_var("MIRI_SYSROOT", &sysroot); // pass the env var to the processes we spawn, which will turn it into "--sysroot" flags
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// 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 {
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// Print just the sysroot and nothing else; this way we do not need any escaping.
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println!("{}", sysroot.display());
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} else if subcommand == MiriCommand::Setup {
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println!("A libstd for Miri is now available in `{}`.", sysroot.display());
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}
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}
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fn in_cargo_miri() {
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let (subcommand, skip) = match std::env::args().nth(2).as_deref() {
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Some("test") => (MiriCommand::Test, 3),
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Some("run") => (MiriCommand::Run, 3),
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Some("setup") => (MiriCommand::Setup, 3),
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// Default command, if there is an option or nothing.
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Some(s) if s.starts_with("-") => (MiriCommand::Run, 2),
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None => (MiriCommand::Run, 2),
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// Invalid command.
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Some(s) => show_error(format!("Unknown command `{}`", s)),
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};
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let verbose = has_arg_flag("-v");
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// We always setup.
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setup(subcommand);
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if subcommand == MiriCommand::Setup {
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// Stop here.
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return;
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}
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// Now run the command.
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for target in list_targets() {
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let mut args = std::env::args().skip(skip);
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let kind = target
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.kind
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.get(0)
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.expect("badly formatted cargo metadata: target::kind is an empty array");
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// Now we run `cargo check $FLAGS $ARGS`, giving the user the
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// change to add additional arguments. `FLAGS` is set to identify
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// this target. The user gets to control what gets actually passed to Miri.
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let mut cmd = cargo();
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cmd.arg("check");
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match (subcommand, kind.as_str()) {
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(MiriCommand::Run, "bin") => {
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// FIXME: we just run all the binaries here.
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// We should instead support `cargo miri --bin foo`.
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cmd.arg("--bin").arg(target.name);
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}
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(MiriCommand::Test, "test") => {
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cmd.arg("--test").arg(target.name);
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}
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(MiriCommand::Test, "lib") => {
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// There can be only one lib.
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cmd.arg("--lib").arg("--profile").arg("test");
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}
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(MiriCommand::Test, "bin") => {
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cmd.arg("--bin").arg(target.name).arg("--profile").arg("test");
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}
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// The remaining targets we do not even want to build.
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_ => continue,
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}
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// Forward user-defined `cargo` args until first `--`.
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while let Some(arg) = args.next() {
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if arg == "--" {
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break;
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}
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cmd.arg(arg);
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}
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// We want to always run `cargo` with `--target`. This later helps us detect
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// which crates are proc-macro/build-script (host crates) and which crates are
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// needed for the program itself.
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if get_arg_flag_value("--target").is_none() {
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// When no `--target` is given, default to the host.
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cmd.arg("--target");
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cmd.arg(version_info().host);
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}
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// Serialize the remaining args into a special environemt variable.
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// This will be read by `inside_cargo_rustc` when we go to invoke
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// our actual target crate (the binary or the test we are running).
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// Since we're using "cargo check", we have no other way of passing
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// these arguments.
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let args_vec: Vec<String> = args.collect();
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cmd.env("MIRI_ARGS", serde_json::to_string(&args_vec).expect("failed to serialize args"));
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// Set `RUSTC_WRAPPER` to ourselves. Cargo will prepend that binary to its usual invocation,
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// i.e., the first argument is `rustc` -- which is what we use in `main` to distinguish
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// the two codepaths. (That extra argument is why we prefer this over setting `RUSTC`.)
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if env::var_os("RUSTC_WRAPPER").is_some() {
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println!("WARNING: Ignoring existing `RUSTC_WRAPPER` environment variable, Miri does not support wrapping.");
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}
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let path = std::env::current_exe().expect("current executable path invalid");
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cmd.env("RUSTC_WRAPPER", path);
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if verbose {
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cmd.env("MIRI_VERBOSE", ""); // this makes `inside_cargo_rustc` verbose.
|
|
eprintln!("+ {:?}", cmd);
|
|
}
|
|
|
|
let exit_status =
|
|
cmd.spawn().expect("could not run cargo").wait().expect("failed to wait for cargo?");
|
|
|
|
if !exit_status.success() {
|
|
std::process::exit(exit_status.code().unwrap_or(-1))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn inside_cargo_rustc() {
|
|
/// 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.
|
|
///
|
|
/// Currently, we detect this by checking for "--target=", which is
|
|
/// never set for host crates. This matches what rustc bootstrap does,
|
|
/// which hopefully makes it "reliable enough". This relies on us always
|
|
/// invoking cargo itself with `--target`, which `in_cargo_miri` ensures.
|
|
fn is_target_crate() -> bool {
|
|
get_arg_flag_value("--target").is_some()
|
|
}
|
|
|
|
/// 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')
|
|
/// Cargo does not give us this information directly, so we need to check
|
|
/// various command-line flags.
|
|
fn is_runnable_crate() -> bool {
|
|
let is_bin = get_arg_flag_value("--crate-type").as_deref() == Some("bin");
|
|
let is_test = has_arg_flag("--test");
|
|
is_bin || is_test
|
|
}
|
|
|
|
let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
|
|
let target_crate = is_target_crate();
|
|
|
|
let mut cmd = miri();
|
|
// Forward arguments.
|
|
cmd.args(std::env::args().skip(2)); // skip `cargo-miri rustc`
|
|
|
|
// We make sure to only specify our custom Xargo sysroot for target crates - that is,
|
|
// crates which are needed for interpretation by Miri. proc-macros and build scripts
|
|
// should use the default sysroot.
|
|
if target_crate {
|
|
let sysroot =
|
|
env::var_os("MIRI_SYSROOT").expect("The wrapper should have set MIRI_SYSROOT");
|
|
cmd.arg("--sysroot");
|
|
cmd.arg(sysroot);
|
|
}
|
|
|
|
// If this is a runnable target crate, we want Miri to start interpretation;
|
|
// otherwise we want Miri to behave like rustc and build the crate as usual.
|
|
if target_crate && is_runnable_crate() {
|
|
// This is the binary or test crate that we want to interpret under Miri.
|
|
// (Testing `target_crate` is needed to exclude build scripts.)
|
|
// We deserialize the arguments that are meant for Miri from the special environment
|
|
// variable "MIRI_ARGS", and feed them to the 'miri' binary.
|
|
//
|
|
// `env::var` is okay here, well-formed JSON is always UTF-8.
|
|
let magic = std::env::var("MIRI_ARGS").expect("missing MIRI_ARGS");
|
|
let miri_args: Vec<String> =
|
|
serde_json::from_str(&magic).expect("failed to deserialize MIRI_ARGS");
|
|
cmd.args(miri_args);
|
|
} else {
|
|
// We want to compile, not interpret.
|
|
cmd.env("MIRI_BE_RUSTC", "1");
|
|
};
|
|
|
|
// Run it.
|
|
if verbose {
|
|
eprintln!("+ {:?}", cmd);
|
|
}
|
|
match cmd.status() {
|
|
Ok(exit) =>
|
|
if !exit.success() {
|
|
std::process::exit(exit.code().unwrap_or(42));
|
|
},
|
|
Err(e) => panic!("error running {:?}:\n{:?}", cmd, e),
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
// 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;
|
|
}
|
|
|
|
if let Some("miri") = std::env::args().nth(1).as_deref() {
|
|
// This arm is for when `cargo miri` is called. We call `cargo check` for each applicable target,
|
|
// but with the `RUSTC` env var set to the `cargo-miri` binary so that we come back in the other branch,
|
|
// and dispatch the invocations to `rustc` and `miri`, respectively.
|
|
in_cargo_miri();
|
|
} else if let Some("rustc") = std::env::args().nth(1).as_deref() {
|
|
// This arm is executed when `cargo-miri` runs `cargo check` with the `RUSTC_WRAPPER` env var set to itself:
|
|
// dependencies get dispatched to `rustc`, the final test/binary to `miri`.
|
|
inside_cargo_rustc();
|
|
} else {
|
|
show_error(format!(
|
|
"`cargo-miri` must be called with either `miri` or `rustc` as first argument."
|
|
))
|
|
}
|
|
}
|