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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
//! Loads "sysroot" crate.
//!
//! One confusing point here is that normally sysroot is a bunch of `.rlib`s,
//! but we can't process `.rlib` and need source code instead. The source code
//! is typically installed with `rustup component add rust-src` command.
use std::{convert::TryFrom, env, ops, path::PathBuf, process::Command};
use anyhow::{format_err, Result};
use la_arena::{Arena, Idx};
use paths::{AbsPath, AbsPathBuf};
use crate::utf8_stdout;
#[derive(Default, Debug, Clone, Eq, PartialEq)]
pub struct Sysroot {
crates: Arena<SysrootCrateData>,
}
pub(crate) 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 public_deps(&self) -> impl Iterator<Item = (&'static str, SysrootCrate)> + '_ {
// core is added as a dependency before std in order to
// mimic rustcs dependency order
["core", "alloc", "std"].iter().filter_map(move |&it| Some((it, self.by_name(it)?)))
}
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> {
log::debug!("Discovering sysroot for {}", cargo_toml.display());
let current_dir = cargo_toml.parent().ok_or_else(|| {
format_err!("Failed to find the parent directory for {}", cargo_toml.display())
})?;
let sysroot_dir = discover_sysroot_dir(current_dir)?;
let sysroot_src_dir = discover_sysroot_src_dir(&sysroot_dir, current_dir)?;
let res = Sysroot::load(&sysroot_src_dir)?;
Ok(res)
}
pub fn discover_rustc(cargo_toml: &AbsPath) -> Option<AbsPathBuf> {
log::debug!("Discovering rustc source for {}", cargo_toml.display());
let current_dir = cargo_toml.parent().unwrap();
discover_sysroot_dir(current_dir).ok().and_then(|sysroot_dir| get_rustc_src(&sysroot_dir))
}
pub fn load(sysroot_src_dir: &AbsPath) -> Result<Sysroot> {
let mut sysroot = Sysroot { crates: Arena::default() };
for name in SYSROOT_CRATES.trim().lines() {
let root = [format!("{}/src/lib.rs", name), format!("lib{}/lib.rs", name)]
.iter()
.map(|it| sysroot_src_dir.join(it))
.find(|it| it.exists());
if let Some(root) = root {
sysroot.crates.alloc(SysrootCrateData {
name: name.into(),
root,
deps: Vec::new(),
});
}
}
if let Some(std) = sysroot.by_name("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);
}
}
if sysroot.by_name("core").is_none() {
let var_note = if env::var_os("RUST_SRC_PATH").is_some() {
" (`RUST_SRC_PATH` might be incorrect, try unsetting it)"
} else {
""
};
anyhow::bail!(
"could not find libcore in sysroot path `{}`{}",
sysroot_src_dir.as_ref().display(),
var_note,
);
}
Ok(sysroot)
}
fn by_name(&self, name: &str) -> Option<SysrootCrate> {
let (id, _data) = self.crates.iter().find(|(_id, data)| data.name == name)?;
Some(id)
}
}
fn discover_sysroot_dir(current_dir: &AbsPath) -> Result<AbsPathBuf> {
let mut rustc = Command::new(toolchain::rustc());
rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
log::debug!("Discovering sysroot by {:?}", rustc);
let stdout = utf8_stdout(rustc)?;
Ok(AbsPathBuf::assert(PathBuf::from(stdout)))
}
fn discover_sysroot_src_dir(
sysroot_path: &AbsPathBuf,
current_dir: &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()))?;
let core = path.join("core");
if core.exists() {
log::debug!("Discovered sysroot by RUST_SRC_PATH: {}", path.display());
return Ok(path);
}
log::debug!("RUST_SRC_PATH is set, but is invalid (no core: {:?}), ignoring", core);
}
get_rust_src(sysroot_path)
.or_else(|| {
let mut rustup = Command::new(toolchain::rustup());
rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
utf8_stdout(rustup).ok()?;
get_rust_src(sysroot_path)
})
.ok_or_else(|| {
format_err!(
"\
can't load standard library from sysroot
{}
(discovered via `rustc --print sysroot`)
try installing the Rust source the same way you installed rustc",
sysroot_path.display(),
)
})
}
fn get_rustc_src(sysroot_path: &AbsPath) -> Option<AbsPathBuf> {
let rustc_src = sysroot_path.join("lib/rustlib/rustc-src/rust/compiler/rustc/Cargo.toml");
log::debug!("Checking for rustc source code: {}", rustc_src.display());
if rustc_src.exists() {
Some(rustc_src)
} else {
None
}
}
fn get_rust_src(sysroot_path: &AbsPath) -> Option<AbsPathBuf> {
// Try the new path first since the old one still exists.
let rust_src = sysroot_path.join("lib/rustlib/src/rust");
log::debug!("Checking sysroot (looking for `library` and `src` dirs): {}", rust_src.display());
["library", "src"].iter().map(|it| rust_src.join(it)).find(|it| it.exists())
}
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";
|
