rust/src/driver.rs
2019-02-01 13:21:19 -05:00

152 lines
6.1 KiB
Rust

// error-pattern:yummy
#![feature(box_syntax)]
#![feature(rustc_private)]
#![feature(try_from)]
#![allow(clippy::missing_docs_in_private_items)]
// FIXME: switch to something more ergonomic here, once available.
// (currently there is no way to opt into sysroot crates w/o `extern crate`)
#[allow(unused_extern_crates)]
extern crate rustc_driver;
#[allow(unused_extern_crates)]
extern crate rustc_plugin;
use self::rustc_driver::{driver::CompileController, Compilation};
use std::convert::TryInto;
use std::path::Path;
use std::process::{exit, Command};
fn show_version() {
println!(env!("CARGO_PKG_VERSION"));
}
#[allow(clippy::too_many_lines)]
pub fn main() {
rustc_driver::init_rustc_env_logger();
exit(
rustc_driver::run(move || {
use std::env;
if std::env::args().any(|a| a == "--version" || a == "-V") {
show_version();
exit(0);
}
let sys_root = option_env!("SYSROOT")
.map(String::from)
.or_else(|| std::env::var("SYSROOT").ok())
.or_else(|| {
let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
})
.or_else(|| {
Command::new("rustc")
.arg("--print")
.arg("sysroot")
.output()
.ok()
.and_then(|out| String::from_utf8(out.stdout).ok())
.map(|s| s.trim().to_owned())
})
.expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
// Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
// We're invoking the compiler programmatically, so we ignore this/
let mut orig_args: Vec<String> = env::args().collect();
if orig_args.len() <= 1 {
std::process::exit(1);
}
if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
// we still want to be able to invoke it normally though
orig_args.remove(1);
}
// this conditional check for the --sysroot flag is there so users can call
// `clippy_driver` directly
// without having to pass --sysroot or anything
let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
orig_args.clone()
} else {
orig_args
.clone()
.into_iter()
.chain(Some("--sysroot".to_owned()))
.chain(Some(sys_root))
.collect()
};
// this check ensures that dependencies are built but not linted and the final
// crate is
// linted but not built
let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
|| orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
if clippy_enabled {
args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
args.extend(extra_args.split("__CLIPPY_HACKERY__").filter_map(|s| {
if s.is_empty() {
None
} else {
Some(s.to_string())
}
}));
}
}
let mut controller = CompileController::basic();
if clippy_enabled {
controller.after_parse.callback = Box::new(move |state| {
let mut registry = rustc_plugin::registry::Registry::new(
state.session,
state
.krate
.as_ref()
.expect(
"at this compilation stage \
the crate must be parsed",
)
.span,
);
registry.args_hidden = Some(Vec::new());
let conf = clippy_lints::read_conf(&registry);
clippy_lints::register_plugins(&mut registry, &conf);
let rustc_plugin::registry::Registry {
early_lint_passes,
late_lint_passes,
lint_groups,
llvm_passes,
attributes,
..
} = registry;
let sess = &state.session;
let mut ls = sess.lint_store.borrow_mut();
for pass in early_lint_passes {
ls.register_early_pass(Some(sess), true, false, pass);
}
for pass in late_lint_passes {
ls.register_late_pass(Some(sess), true, pass);
}
for (name, (to, deprecated_name)) in lint_groups {
ls.register_group(Some(sess), true, name, deprecated_name, to);
}
clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
clippy_lints::register_renamed(&mut ls);
sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
sess.plugin_attributes.borrow_mut().extend(attributes);
});
}
controller.compilation_done.stop = Compilation::Stop;
let args = args;
rustc_driver::run_compiler(&args, Box::new(controller), None, None)
})
.try_into()
.expect("exit code too large"),
)
}