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
|
//! FIXME: write short doc here
use std::{
env,
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 core(&self) -> Option<SysrootCrate> {
self.by_name("core")
}
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 src = try_find_src_path(cargo_toml)?;
if !src.exists() {
Err(format!(
"can't load standard library from sysroot\n\
{:?}\n\
try running `rustup component add rust-src` or set `RUST_SRC_PATH`",
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)
}
}
fn try_find_src_path(cargo_toml: &Path) -> Result<PathBuf> {
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()?;
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());
Ok(sysroot_path.join("lib/rustlib/src/rust/src"))
}
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";
|
