aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_project_model/src/sysroot.rs
blob: 8239797b6b763b4b8d43de5242dc529b26b52445 (plain)
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
//! FIXME: write short doc here

use std::{convert::TryFrom, env, ops, path::Path, process::Command};

use anyhow::{bail, format_err, Result};
use arena::{Arena, Idx};
use paths::{AbsPath, AbsPathBuf};

use crate::utf8_stdout;

#[derive(Default, Debug, Clone, Eq, PartialEq)]
pub struct Sysroot {
    crates: Arena<SysrootCrateData>,
}

pub 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 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: &AbsPath) -> 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() {
            // FIXME: remove this path when 1.47 comes out
            // https://github.com/rust-lang/rust/pull/73265
            let root = src.join(format!("lib{}", name)).join("lib.rs");
            if root.exists() {
                sysroot.crates.alloc(SysrootCrateData {
                    name: name.into(),
                    root,
                    deps: Vec::new(),
                });
            } else {
                let root = src.join(name).join("src/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 get_or_install_rust_src(cargo_toml: &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()))?;
        return Ok(path);
    }
    let current_dir = cargo_toml.parent().unwrap();
    let mut rustc = Command::new(toolchain::rustc());
    rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
    let stdout = utf8_stdout(rustc)?;
    let sysroot_path = AbsPath::assert(Path::new(stdout.trim()));
    let mut src = get_rust_src(sysroot_path);
    if src.is_none() {
        let mut rustup = Command::new(toolchain::rustup());
        rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
        utf8_stdout(rustup)?;
        src = get_rust_src(sysroot_path);
    }
    match src {
        Some(r) => Ok(r),
        None => 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`",
            sysroot_path.display(),
        ),
    }
}

fn get_rust_src(sysroot_path: &AbsPath) -> Option<AbsPathBuf> {
    // try the new path first since the old one still exists
    let mut src_path = sysroot_path.join("lib/rustlib/src/rust/library");
    if !src_path.exists() {
        // FIXME: remove this path when 1.47 comes out
        // https://github.com/rust-lang/rust/pull/73265
        src_path = sysroot_path.join("lib/rustlib/src/rust/src");
    }
    if src_path.exists() {
        Some(src_path)
    } else {
        None
    }
}

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";