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minor: Add some debug traces for cfg fetching

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This commit is contained in:
Lukas Wirth 2022-02-01 13:32:09 +01:00
parent fcdced115e
commit dbd5a70ea3
2 changed files with 43 additions and 26 deletions
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15
crates/project_model/src/cfg_flag.rs
View File

@ -1,7 +1,7 @@
//! Parsing of CfgFlags as command line arguments, as in
//!
//! rustc main.rs --cfg foo --cfg 'feature="bar"'
use std::str::FromStr;
use std::{fmt, str::FromStr};
use cfg::CfgOptions;
@ -48,3 +48,16 @@ impl Extend<CfgFlag> for CfgOptions {
}
}
}
impl fmt::Display for CfgFlag {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
CfgFlag::Atom(atom) => f.write_str(atom),
CfgFlag::KeyValue { key, value } => {
f.write_str(key)?;
f.write_str("=")?;
f.write_str(value)
}
}
}
}

54
crates/project_model/src/rustc_cfg.rs
View File

@ -19,38 +19,42 @@ pub(crate) fn get(cargo_toml: Option<&ManifestPath>, target: Option<&str>) -> Ve
}
match get_rust_cfgs(cargo_toml, target) {
Ok(rustc_cfgs) => res.extend(rustc_cfgs.lines().map(|it| it.parse().unwrap())),
Err(e) => tracing::error!("failed to get rustc cfgs: {:#}", e),
Ok(rustc_cfgs) => {
tracing::debug!(
"rustc cfgs found: {:?}",
rustc_cfgs
.lines()
.map(|it| it.parse::<CfgFlag>().map(|it| it.to_string()))
.collect::<Vec<_>>()
);
res.extend(rustc_cfgs.lines().filter_map(|it| it.parse().ok()));
}
Err(e) => tracing::error!("failed to get rustc cfgs: {e:?}"),
}
res
}
fn get_rust_cfgs(cargo_toml: Option<&ManifestPath>, target: Option<&str>) -> Result<String> {
let cargo_rust_cfgs = match cargo_toml {
Some(cargo_toml) => {
let mut cargo_config = Command::new(toolchain::cargo());
cargo_config
.current_dir(cargo_toml.parent())
.args(&["-Z", "unstable-options", "rustc", "--print", "cfg"])
.env("RUSTC_BOOTSTRAP", "1");
if let Some(target) = target {
cargo_config.args(&["--target", target]);
}
utf8_stdout(cargo_config).ok()
if let Some(cargo_toml) = cargo_toml {
let mut cargo_config = Command::new(toolchain::cargo());
cargo_config
.current_dir(cargo_toml.parent())
.args(&["-Z", "unstable-options", "rustc", "--print", "cfg"])
.env("RUSTC_BOOTSTRAP", "1");
if let Some(target) = target {
cargo_config.args(&["--target", target]);
}
None => None,
};
match cargo_rust_cfgs {
Some(stdout) => Ok(stdout),
None => {
// using unstable cargo features failed, fall back to using plain rustc
let mut cmd = Command::new(toolchain::rustc());
cmd.args(&["--print", "cfg", "-O"]);
if let Some(target) = target {
cmd.args(&["--target", target]);
}
utf8_stdout(cmd)
match utf8_stdout(cargo_config) {
Ok(it) => return Ok(it),
Err(e) => tracing::debug!("{e:?}: falling back to querying rustc for cfgs"),
}
}
// using unstable cargo features failed, fall back to using plain rustc
let mut cmd = Command::new(toolchain::rustc());
cmd.args(&["--print", "cfg", "-O"]);
if let Some(target) = target {
cmd.args(&["--target", target]);
}
utf8_stdout(cmd)
}