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|
//! FIXME: write short doc here
use anyhow::{bail, Context, Result};
use std::{
env, ops,
path::{Path, PathBuf},
process::{Command, Output},
};
use ra_arena::{Arena, Idx};
use ra_env::get_path_for_executable;
#[derive(Default, Debug, Clone)]
pub struct Sysroot {
crates: Arena<SysrootCrateData>,
}
pub type SysrootCrate = Idx<SysrootCrateData>;
#[derive(Debug, Clone)]
pub struct SysrootCrateData {
pub name: String,
pub root: PathBuf,
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: &Path) -> 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() {
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.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 create_command_text(program: &str, args: &[&str]) -> String {
format!("{} {}", program, args.join(" "))
}
fn run_command_in_cargo_dir(cargo_toml: &Path, program: &str, args: &[&str]) -> Result<Output> {
let output = Command::new(program)
.current_dir(cargo_toml.parent().unwrap())
.args(args)
.output()
.context(format!("{} failed", create_command_text(program, args)))?;
if !output.status.success() {
match output.status.code() {
Some(code) => bail!(
"failed to run the command: '{}' exited with code {}",
create_command_text(program, args),
code
),
None => bail!(
"failed to run the command: '{}' terminated by signal",
create_command_text(program, args)
),
};
}
Ok(output)
}
fn get_or_install_rust_src(cargo_toml: &Path) -> Result<PathBuf> {
if let Ok(path) = env::var("RUST_SRC_PATH") {
return Ok(path.into());
}
let rustc = get_path_for_executable("rustc")?;
let rustc_output = run_command_in_cargo_dir(cargo_toml, &rustc, &["--print", "sysroot"])?;
let stdout = String::from_utf8(rustc_output.stdout)?;
let sysroot_path = Path::new(stdout.trim());
let src_path = sysroot_path.join("lib/rustlib/src/rust/src");
if !src_path.exists() {
let rustup = get_path_for_executable("rustup")?;
run_command_in_cargo_dir(cargo_toml, &rustup, &["component", "add", "rust-src"])?;
}
if !src_path.exists() {
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`",
src_path.display(),
)
}
Ok(src_path)
}
impl SysrootCrateData {
pub fn root_dir(&self) -> &Path {
self.root.parent().unwrap()
}
}
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";
|
