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|
//! Loads "sysroot" crate.
//!
//! One confusing point here is that normally sysroot is a bunch of `.rlib`s,
//! but we can't process `.rlib` and need source code instead. The source code
//! is typically installed with `rustup component add rust-src` command.
use std::{convert::TryFrom, env, ops, path::PathBuf, process::Command};
use anyhow::{format_err, Result};
use arena::{Arena, Idx};
use paths::{AbsPath, AbsPathBuf};
use crate::utf8_stdout;
#[derive(Default, Debug, Clone, Eq, PartialEq)]
pub struct Sysroot {
crates: Arena<SysrootCrateData>,
}
pub type SysrootCrate = Idx<SysrootCrateData>;
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct SysrootCrateData {
pub name: String,
pub root: AbsPathBuf,
pub deps: Vec<SysrootCrate>,
}
impl ops::Index<SysrootCrate> for Sysroot {
type Output = SysrootCrateData;
fn index(&self, index: SysrootCrate) -> &SysrootCrateData {
&self.crates[index]
}
}
impl Sysroot {
pub fn public_deps(&self) -> impl Iterator<Item = (&'static str, SysrootCrate)> + '_ {
// core is added as a dependency before std in order to
// mimic rustcs dependency order
vec!["core", "alloc", "std"].into_iter().filter_map(move |it| Some((it, self.by_name(it)?)))
}
pub fn proc_macro(&self) -> Option<SysrootCrate> {
self.by_name("proc_macro")
}
pub fn crates<'a>(&'a self) -> impl Iterator<Item = SysrootCrate> + ExactSizeIterator + 'a {
self.crates.iter().map(|(id, _data)| id)
}
pub fn discover(cargo_toml: &AbsPath) -> Result<Sysroot> {
let current_dir = cargo_toml.parent().unwrap();
let sysroot_src_dir = discover_sysroot_src_dir(current_dir)?;
let res = Sysroot::load(&sysroot_src_dir);
Ok(res)
}
pub fn load(sysroot_src_dir: &AbsPath) -> Sysroot {
let mut sysroot = Sysroot { crates: Arena::default() };
for name in SYSROOT_CRATES.trim().lines() {
// FIXME: first path when 1.47 comes out
// https://github.com/rust-lang/rust/pull/73265
let root = [format!("lib{}/lib.rs", name), format!("{}/src/lib.rs", name)]
.iter()
.map(|it| sysroot_src_dir.join(it))
.find(|it| it.exists());
if let Some(root) = root {
sysroot.crates.alloc(SysrootCrateData {
name: name.into(),
root,
deps: Vec::new(),
});
}
}
if let Some(std) = sysroot.by_name("std") {
for dep in STD_DEPS.trim().lines() {
if let Some(dep) = sysroot.by_name(dep) {
sysroot.crates[std].deps.push(dep)
}
}
}
if let Some(alloc) = sysroot.by_name("alloc") {
if let Some(core) = sysroot.by_name("core") {
sysroot.crates[alloc].deps.push(core);
}
}
sysroot
}
fn by_name(&self, name: &str) -> Option<SysrootCrate> {
let (id, _data) = self.crates.iter().find(|(_id, data)| data.name == name)?;
Some(id)
}
}
fn discover_sysroot_src_dir(current_dir: &AbsPath) -> Result<AbsPathBuf> {
if let Ok(path) = env::var("RUST_SRC_PATH") {
let path = AbsPathBuf::try_from(path.as_str())
.map_err(|path| format_err!("RUST_SRC_PATH must be absolute: {}", path.display()))?;
return Ok(path);
}
let sysroot_path = {
let mut rustc = Command::new(toolchain::rustc());
rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
let stdout = utf8_stdout(rustc)?;
AbsPathBuf::assert(PathBuf::from(stdout))
};
get_rust_src(&sysroot_path)
.or_else(|| {
let mut rustup = Command::new(toolchain::rustup());
rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
utf8_stdout(rustup).ok()?;
get_rust_src(&sysroot_path)
})
.ok_or_else(|| {
format_err!(
"\
can't load standard library from sysroot
{}
(discovered via `rustc --print sysroot`)
try running `rustup component add rust-src` or set `RUST_SRC_PATH`",
sysroot_path.display(),
)
})
}
fn get_rust_src(sysroot_path: &AbsPath) -> Option<AbsPathBuf> {
// Try the new path first since the old one still exists.
//
// FIXME: remove `src` when 1.47 comes out
// https://github.com/rust-lang/rust/pull/73265
let rust_src = sysroot_path.join("lib/rustlib/src/rust");
["library", "src"].iter().map(|it| rust_src.join(it)).find(|it| it.exists())
}
impl SysrootCrateData {
pub fn root_dir(&self) -> &AbsPath {
self.root.parent().unwrap()
}
}
const SYSROOT_CRATES: &str = "
alloc
core
panic_abort
panic_unwind
proc_macro
profiler_builtins
rtstartup
std
stdarch
term
test
unwind";
const STD_DEPS: &str = "
alloc
core
panic_abort
panic_unwind
profiler_builtins
rtstartup
proc_macro
stdarch
term
test
unwind";
|
