0019fe2459
Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>
617 lines
23 KiB
Rust
617 lines
23 KiB
Rust
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, BufReader, BufWriter, 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 serde::{Deserialize, Serialize};
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use rustc_version::VersionMeta;
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const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 22);
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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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/// The inforamtion Miri needs to run a crate. Stored as JSON when the crate is "compiled".
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#[derive(Serialize, Deserialize)]
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struct CrateRunInfo {
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/// The command-line arguments.
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args: Vec<String>,
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/// The environment.
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env: Vec<(OsString, OsString)>,
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}
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impl CrateRunInfo {
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/// Gather all the information we need.
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fn collect(args: env::Args) -> Self {
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let args = args.collect();
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let env = env::vars_os().collect();
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CrateRunInfo { args, env }
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}
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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 exec(mut cmd: Command) -> ! {
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let exit_status = cmd.status().expect("failed to run command");
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std::process::exit(exit_status.code().unwrap_or(-1))
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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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// Azure doesn't set `CI` though (nothing to see here, just Microsoft being Microsoft),
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// so we also check their `TF_BUILD`.
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let is_ci = env::var_os("CI").is_some() || env::var_os("TF_BUILD").is_some();
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if ask && !is_ci {
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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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let path = PathBuf::from(path);
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// Make path absolute if possible.
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path.canonicalize().unwrap_or(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/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");
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if !rustup_src.join("std").join("Cargo.toml").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("check").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 phase_cargo_miri(mut args: env::Args) {
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// Require a subcommand before any flags.
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// We cannot know which of those flags take arguments and which do not,
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// so we cannot detect subcommands later.
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let subcommand = match args.next().as_deref() {
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Some("test") => MiriCommand::Test,
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Some("run") => MiriCommand::Run,
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Some("setup") => MiriCommand::Setup,
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// Invalid command.
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_ => show_error(format!("`cargo miri` must be immediately followed by `test`, `run`, or `setup`.")),
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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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// Invoke actual cargo for the job, but with different flags.
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let miri_path = std::env::current_exe().expect("current executable path invalid");
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let cargo_cmd = match subcommand {
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MiriCommand::Test => "test",
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MiriCommand::Run => "run",
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MiriCommand::Setup => return, // `cargo miri setup` stops here.
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};
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let mut cmd = cargo();
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cmd.arg(cargo_cmd);
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// Make sure we know the build target, and cargo does, too.
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// This is needed to make the `CARGO_TARGET_*_RUNNER` env var do something,
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// and it later helps us detect which crates are proc-macro/build-script
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// (host crates) and which crates are needed for the program itself.
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let target = if let Some(target) = get_arg_flag_value("--target") {
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target
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} else {
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// No target given. Pick default and tell cargo about it.
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let host = version_info().host;
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cmd.arg("--target");
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cmd.arg(&host);
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host
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};
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// Forward all further arguments.
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cmd.args(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 `RUSTC_WRAPPER` environment variable, Miri does not support wrapping.");
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}
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cmd.env("RUSTC_WRAPPER", &miri_path);
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if verbose {
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eprintln!("+ RUSTC_WRAPPER={:?}", miri_path);
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}
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// Set the runner for the current target to us as well, so we can interpret the binaries.
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let runner_env_name = format!("CARGO_TARGET_{}_RUNNER", target.to_uppercase().replace('-', "_"));
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cmd.env(runner_env_name, &miri_path);
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// Run cargo.
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if verbose {
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cmd.env("MIRI_VERBOSE", ""); // this makes `inside_cargo_rustc` verbose.
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eprintln!("[cargo-miri miri] {:?}", cmd);
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}
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exec(cmd)
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}
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fn phase_cargo_rustc(args: env::Args) {
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/// Determines if we are being invoked (as rustc) to build a crate for
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/// the "target" architecture, in contrast to the "host" architecture.
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/// Host crates are for build scripts and proc macros and still need to
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/// be built like normal; target crates need to be built for or interpreted
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/// by Miri.
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///
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/// Currently, we detect this by checking for "--target=", which is
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/// 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
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/// invoking cargo itself with `--target`, which `in_cargo_miri` ensures.
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fn is_target_crate() -> bool {
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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
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/// 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
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/// various command-line flags.
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fn is_runnable_crate() -> bool {
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let is_bin = get_arg_flag_value("--crate-type").as_deref() == Some("bin");
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let is_test = has_arg_flag("--test");
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let print = get_arg_flag_value("--print").is_some();
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(is_bin || is_test) && !print
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}
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let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
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let target_crate = is_target_crate();
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if target_crate && is_runnable_crate() {
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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 info = CrateRunInfo::collect(args);
|
|
|
|
let mut path = PathBuf::from(get_arg_flag_value("--out-dir").unwrap());
|
|
path.push(format!(
|
|
"{}{}",
|
|
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()),
|
|
));
|
|
if verbose {
|
|
eprintln!("[cargo-miri rustc] writing run info to {:?}", path.display());
|
|
}
|
|
|
|
let file = File::create(&path)
|
|
.unwrap_or_else(|_| show_error(format!("Cannot create {:?}", path.display())));
|
|
let file = BufWriter::new(file);
|
|
serde_json::ser::to_writer(file, &info)
|
|
.unwrap_or_else(|_| show_error(format!("Cannot write to {:?}", path.display())));
|
|
return;
|
|
}
|
|
|
|
let mut cmd = miri();
|
|
// Forward arguments, but (only for target crates!) remove "link" from "--emit" to make this a check-only build.
|
|
let emit_flag = "--emit";
|
|
for arg in args {
|
|
if target_crate && 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") {
|
|
val.remove(i);
|
|
if !val.iter().any(|&s| s == "metadata") {
|
|
val.push("metadata");
|
|
}
|
|
}
|
|
cmd.arg(format!("{}={}", emit_flag, val.join(",")));
|
|
// FIXME: due to this, the `.rlib` file does not get created and cargo re-triggers the build each time.
|
|
} else {
|
|
cmd.arg(arg);
|
|
}
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|
|
// 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.
|
|
cmd.env("MIRI_BE_RUSTC", "1");
|
|
|
|
// Run it.
|
|
if verbose {
|
|
eprintln!("[cargo-miri rustc] {:?}", cmd);
|
|
}
|
|
exec(cmd)
|
|
}
|
|
|
|
fn phase_cargo_runner(binary: &str, binary_args: env::Args) {
|
|
let verbose = std::env::var_os("MIRI_VERBOSE").is_some();
|
|
|
|
let file = File::open(binary)
|
|
.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);
|
|
let info: CrateRunInfo = serde_json::from_reader(file)
|
|
.unwrap_or_else(|_| show_error(format!("File {:?} does not contain valid JSON", binary)));
|
|
fs::remove_file(binary)
|
|
.unwrap_or_else(|_| show_error(format!("Unable to remove file {:?}", binary)));
|
|
|
|
let mut cmd = miri();
|
|
// 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`.
|
|
let mut args = info.args.into_iter();
|
|
let extern_flag = "--extern";
|
|
while let Some(arg) = args.next() {
|
|
if arg == extern_flag {
|
|
let next_arg = args.next().expect("`--extern` should be followed by a filename");
|
|
let next_arg = next_arg.strip_suffix(".rlib").expect("all extern filenames should end in `.rlib`");
|
|
cmd.arg(extern_flag);
|
|
cmd.arg(format!("{}.rmeta", next_arg));
|
|
} else {
|
|
cmd.arg(arg);
|
|
}
|
|
}
|
|
// Set sysroot.
|
|
let sysroot =
|
|
env::var_os("MIRI_SYSROOT").expect("The wrapper should have set MIRI_SYSROOT");
|
|
cmd.arg("--sysroot");
|
|
cmd.arg(sysroot);
|
|
// 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);
|
|
}
|
|
|
|
// Then pass binary arguments.
|
|
cmd.arg("--");
|
|
cmd.args(binary_args);
|
|
|
|
// Run it.
|
|
if verbose {
|
|
eprintln!("[cargo-miri runner] {:?}", cmd);
|
|
}
|
|
exec(cmd)
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
// 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();
|
|
|
|
// 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.
|
|
match args.next().as_deref() {
|
|
Some("miri") => phase_cargo_miri(args),
|
|
Some("rustc") => phase_cargo_rustc(args),
|
|
Some(binary) => phase_cargo_runner(binary, args),
|
|
_ => show_error(format!("`cargo-miri` called without first argument; please only invoke this binary through `cargo miri`")),
|
|
}
|
|
}
|