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|
use std::{
path::{Path, PathBuf},
process::Command,
};
use ra_arena::{impl_arena_id, Arena, RawId};
use crate::Result;
#[derive(Default, Debug, Clone)]
pub struct Sysroot {
crates: Arena<SysrootCrate, SysrootCrateData>,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct SysrootCrate(RawId);
impl_arena_id!(SysrootCrate);
#[derive(Debug, Clone)]
struct SysrootCrateData {
name: String,
root: PathBuf,
deps: Vec<SysrootCrate>,
}
impl Sysroot {
pub fn std(&self) -> Option<SysrootCrate> {
self.by_name("std")
}
pub fn crates<'a>(&'a self) -> impl Iterator<Item = SysrootCrate> + ExactSizeIterator + 'a {
self.crates.iter().map(|(id, _data)| id)
}
pub fn discover(cargo_toml: &Path) -> Result<Sysroot> {
let rustc_output = Command::new("rustc")
.current_dir(cargo_toml.parent().unwrap())
.args(&["--print", "sysroot"])
.output()?;
if !rustc_output.status.success() {
Err("failed to locate sysroot")?
}
let stdout = String::from_utf8(rustc_output.stdout)?;
let sysroot_path = Path::new(stdout.trim());
let src = sysroot_path.join("lib/rustlib/src/rust/src");
if !src.exists() {
Err(format!(
"can't load standard library from sysroot\n\
{:?}\n\
try running `rustup component add rust-src`",
src,
))?;
}
let mut sysroot = Sysroot { crates: Arena::default() };
for name in SYSROOT_CRATES.trim().lines() {
let root = src.join(format!("lib{}", name)).join("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.by_name("alloc") {
if let Some(core) = sysroot.by_name("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)
}
}
impl SysrootCrate {
pub fn name(self, sysroot: &Sysroot) -> &str {
&sysroot.crates[self].name
}
pub fn root(self, sysroot: &Sysroot) -> &Path {
sysroot.crates[self].root.as_path()
}
pub fn root_dir(self, sysroot: &Sysroot) -> &Path {
self.root(sysroot).parent().unwrap()
}
pub fn deps<'a>(self, sysroot: &'a Sysroot) -> impl Iterator<Item = SysrootCrate> + 'a {
sysroot.crates[self].deps.iter().copied()
}
}
const SYSROOT_CRATES: &str = "
std
core
alloc
collections
libc
panic_unwind
proc_macro
rustc_unicode
std_unicode
test
alloc_jemalloc
alloc_system
compiler_builtins
getopts
panic_unwind
panic_abort
rand
term
unwind
build_helper
rustc_asan
rustc_lsan
rustc_msan
rustc_tsan
syntax";
const STD_DEPS: &str = "
alloc
alloc_jemalloc
alloc_system
core
panic_abort
rand
compiler_builtins
unwind
rustc_asan
rustc_lsan
rustc_msan
rustc_tsan
build_helper";
|
