210 lines
6.7 KiB
Rust
210 lines
6.7 KiB
Rust
//! Loads "sysroot" crate.
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//!
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//! One confusing point here is that normally sysroot is a bunch of `.rlib`s,
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//! but we can't process `.rlib` and need source code instead. The source code
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//! is typically installed with `rustup component add rust-src` command.
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use std::{convert::TryFrom, env, fs, ops, path::PathBuf, process::Command};
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use anyhow::{format_err, Result};
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use la_arena::{Arena, Idx};
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use paths::{AbsPath, AbsPathBuf};
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use crate::{utf8_stdout, ManifestPath};
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#[derive(Default, Debug, Clone, Eq, PartialEq)]
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pub struct Sysroot {
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crates: Arena<SysrootCrateData>,
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}
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pub(crate) type SysrootCrate = Idx<SysrootCrateData>;
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct SysrootCrateData {
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pub name: String,
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pub root: ManifestPath,
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pub deps: Vec<SysrootCrate>,
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}
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impl ops::Index<SysrootCrate> for Sysroot {
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type Output = SysrootCrateData;
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fn index(&self, index: SysrootCrate) -> &SysrootCrateData {
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&self.crates[index]
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}
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}
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impl Sysroot {
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pub fn public_deps(&self) -> impl Iterator<Item = (&'static str, SysrootCrate)> + '_ {
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// core is added as a dependency before std in order to
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// mimic rustcs dependency order
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["core", "alloc", "std"].iter().filter_map(move |&it| Some((it, self.by_name(it)?)))
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}
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pub fn proc_macro(&self) -> Option<SysrootCrate> {
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self.by_name("proc_macro")
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}
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pub fn crates<'a>(&'a self) -> impl Iterator<Item = SysrootCrate> + ExactSizeIterator + 'a {
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self.crates.iter().map(|(id, _data)| id)
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}
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pub fn discover(dir: &AbsPath) -> Result<Sysroot> {
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log::debug!("Discovering sysroot for {}", dir.display());
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let sysroot_dir = discover_sysroot_dir(dir)?;
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let sysroot_src_dir = discover_sysroot_src_dir(&sysroot_dir, dir)?;
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let res = Sysroot::load(&sysroot_src_dir)?;
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Ok(res)
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}
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pub fn discover_rustc(cargo_toml: &ManifestPath) -> Option<ManifestPath> {
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log::debug!("Discovering rustc source for {}", cargo_toml.display());
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let current_dir = cargo_toml.parent();
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discover_sysroot_dir(current_dir).ok().and_then(|sysroot_dir| get_rustc_src(&sysroot_dir))
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}
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pub fn load(sysroot_src_dir: &AbsPath) -> Result<Sysroot> {
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let mut sysroot = Sysroot { crates: Arena::default() };
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for path in SYSROOT_CRATES.trim().lines() {
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let name = path.split('/').last().unwrap();
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let root = [format!("{}/src/lib.rs", path), format!("lib{}/lib.rs", path)]
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.iter()
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.map(|it| sysroot_src_dir.join(it))
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.filter_map(|it| ManifestPath::try_from(it).ok())
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.find(|it| fs::metadata(it).is_ok());
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if let Some(root) = root {
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sysroot.crates.alloc(SysrootCrateData {
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name: name.into(),
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root,
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deps: Vec::new(),
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});
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}
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}
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if let Some(std) = sysroot.by_name("std") {
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for dep in STD_DEPS.trim().lines() {
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if let Some(dep) = sysroot.by_name(dep) {
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sysroot.crates[std].deps.push(dep)
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}
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}
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}
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if let Some(alloc) = sysroot.by_name("alloc") {
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if let Some(core) = sysroot.by_name("core") {
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sysroot.crates[alloc].deps.push(core);
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}
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}
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if let Some(proc_macro) = sysroot.by_name("proc_macro") {
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if let Some(std) = sysroot.by_name("std") {
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sysroot.crates[proc_macro].deps.push(std);
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}
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}
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if sysroot.by_name("core").is_none() {
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let var_note = if env::var_os("RUST_SRC_PATH").is_some() {
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" (`RUST_SRC_PATH` might be incorrect, try unsetting it)"
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} else {
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""
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};
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anyhow::bail!(
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"could not find libcore in sysroot path `{}`{}",
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sysroot_src_dir.as_ref().display(),
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var_note,
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);
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}
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Ok(sysroot)
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}
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fn by_name(&self, name: &str) -> Option<SysrootCrate> {
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let (id, _data) = self.crates.iter().find(|(_id, data)| data.name == name)?;
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Some(id)
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}
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}
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fn discover_sysroot_dir(current_dir: &AbsPath) -> Result<AbsPathBuf> {
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let mut rustc = Command::new(toolchain::rustc());
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rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
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log::debug!("Discovering sysroot by {:?}", rustc);
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let stdout = utf8_stdout(rustc)?;
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Ok(AbsPathBuf::assert(PathBuf::from(stdout)))
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}
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fn discover_sysroot_src_dir(
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sysroot_path: &AbsPathBuf,
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current_dir: &AbsPath,
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) -> Result<AbsPathBuf> {
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if let Ok(path) = env::var("RUST_SRC_PATH") {
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let path = AbsPathBuf::try_from(path.as_str())
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.map_err(|path| format_err!("RUST_SRC_PATH must be absolute: {}", path.display()))?;
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let core = path.join("core");
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if fs::metadata(&core).is_ok() {
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log::debug!("Discovered sysroot by RUST_SRC_PATH: {}", path.display());
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return Ok(path);
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}
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log::debug!("RUST_SRC_PATH is set, but is invalid (no core: {:?}), ignoring", core);
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}
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get_rust_src(sysroot_path)
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.or_else(|| {
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let mut rustup = Command::new(toolchain::rustup());
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rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
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utf8_stdout(rustup).ok()?;
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get_rust_src(sysroot_path)
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})
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.ok_or_else(|| {
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format_err!(
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"\
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can't load standard library from sysroot
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{}
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(discovered via `rustc --print sysroot`)
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try installing the Rust source the same way you installed rustc",
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sysroot_path.display(),
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)
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})
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}
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fn get_rustc_src(sysroot_path: &AbsPath) -> Option<ManifestPath> {
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let rustc_src = sysroot_path.join("lib/rustlib/rustc-src/rust/compiler/rustc/Cargo.toml");
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let rustc_src = ManifestPath::try_from(rustc_src).ok()?;
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log::debug!("Checking for rustc source code: {}", rustc_src.display());
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if fs::metadata(&rustc_src).is_ok() {
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Some(rustc_src)
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} else {
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None
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}
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}
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fn get_rust_src(sysroot_path: &AbsPath) -> Option<AbsPathBuf> {
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// Try the new path first since the old one still exists.
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let rust_src = sysroot_path.join("lib/rustlib/src/rust");
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log::debug!("Checking sysroot (looking for `library` and `src` dirs): {}", rust_src.display());
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["library", "src"].iter().map(|it| rust_src.join(it)).find(|it| fs::metadata(it).is_ok())
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}
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const SYSROOT_CRATES: &str = "
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alloc
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core
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panic_abort
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panic_unwind
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proc_macro
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profiler_builtins
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std
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stdarch/crates/std_detect
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term
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test
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unwind";
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const STD_DEPS: &str = "
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alloc
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core
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panic_abort
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panic_unwind
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profiler_builtins
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std_detect
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term
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test
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unwind";
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