1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
//! FIXME: write short doc here
use anyhow::{bail, Context, Result};
use std::{
env,
path::{Path, PathBuf},
process::Command,
};
use ra_arena::{impl_arena_id, Arena, RawId};
#[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 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.by_name("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: &Path) -> Result<PathBuf> {
fn try_install_rust_src(cargo_toml: &Path) -> Result<()> {
let rustup_output = Command::new("rustup")
.current_dir(cargo_toml.parent().unwrap())
.args(&["component", "add", "rust-src"])
.output()
.context("rustup component add rust-src failed")?;
if !rustup_output.status.success() {
match rustup_output.status.code() {
Some(code) => bail!(
"failed to install rust-src: rustup component add rust-src exited with code {}",
code
),
None => bail!(
"failed to install rust-src: rustup component add rust-src terminated by signal"
),
};
}
Ok(())
}
if let Ok(path) = env::var("RUST_SRC_PATH") {
return Ok(path.into());
}
let rustc_output = Command::new("rustc")
.current_dir(cargo_toml.parent().unwrap())
.args(&["--print", "sysroot"])
.output()
.context("rustc --print sysroot failed")?;
if !rustc_output.status.success() {
match rustc_output.status.code() {
Some(code) => {
bail!("failed to locate sysroot: rustc --print sysroot exited with code {}", code)
}
None => bail!("failed to locate sysroot: rustc --print sysroot terminated by signal"),
};
}
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() {
try_install_rust_src(cargo_toml)?
}
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 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";
|
