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//! FIXME: write short doc here
use std::{convert::TryFrom, env, ops, path::Path, process::Command};
use anyhow::{bail, 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 core(&self) -> Option<SysrootCrate> {
self.by_name("core")
}
pub fn alloc(&self) -> Option<SysrootCrate> {
self.by_name("alloc")
}
pub fn std(&self) -> Option<SysrootCrate> {
self.by_name("std")
}
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 src = get_or_install_rust_src(cargo_toml)?;
let mut sysroot = Sysroot { crates: Arena::default() };
for name in SYSROOT_CRATES.trim().lines() {
// FIXME: remove this path when 1.47 comes out
// https://github.com/rust-lang/rust/pull/73265
let root = src.join(format!("lib{}", name)).join("lib.rs");
if root.exists() {
sysroot.crates.alloc(SysrootCrateData {
name: name.into(),
root,
deps: Vec::new(),
});
} else {
let root = src.join(name).join("src/lib.rs");
if root.exists() {
sysroot.crates.alloc(SysrootCrateData {
name: name.into(),
root,
deps: Vec::new(),
});
}
}
}
if let Some(std) = sysroot.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.alloc() {
if let Some(core) = sysroot.core() {
sysroot.crates[alloc].deps.push(core);
}
}
Ok(sysroot)
}
fn by_name(&self, name: &str) -> Option<SysrootCrate> {
self.crates.iter().find(|(_id, data)| data.name == name).map(|(id, _data)| id)
}
}
fn get_or_install_rust_src(cargo_toml: &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 current_dir = cargo_toml.parent().unwrap();
let mut rustc = Command::new(toolchain::rustc());
rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
let stdout = utf8_stdout(rustc)?;
let sysroot_path = AbsPath::assert(Path::new(stdout.trim()));
let mut src = get_rust_src(sysroot_path);
if src.is_none() {
let mut rustup = Command::new(toolchain::rustup());
rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
utf8_stdout(rustup)?;
src = get_rust_src(sysroot_path);
}
match src {
Some(r) => Ok(r),
None => bail!(
"can't load standard library from sysroot\n\
{}\n\
(discovered via `rustc --print sysroot`)\n\
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
let mut src_path = sysroot_path.join("lib/rustlib/src/rust/library");
if !src_path.exists() {
// FIXME: remove this path when 1.47 comes out
// https://github.com/rust-lang/rust/pull/73265
src_path = sysroot_path.join("lib/rustlib/src/rust/src");
}
if src_path.exists() {
Some(src_path)
} else {
None
}
}
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";
|
