src/driver.rs

   1 // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution.
   3 //
   4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   7 // option. This file may not be copied, modified, or distributed
   8 // except according to those terms.
   9
  10
  11 // error-pattern:yummy
  12 #![feature(box_syntax)]
  13 #![feature(rustc_private)]
  14
  15 #![feature(try_from)]
  16 #![allow(clippy::missing_docs_in_private_items)]
  17
  18 // FIXME: switch to something more ergonomic here, once available.
  19 // (currently there is no way to opt into sysroot crates w/o `extern crate`)
  20 #[allow(unused_extern_crates)]
  21 extern crate rustc_driver;
  22 #[allow(unused_extern_crates)]
  23 extern crate rustc_plugin;
  24 use self::rustc_driver::{driver::CompileController, Compilation};
  25
  26 use std::convert::TryInto;
  27 use std::path::Path;
  28 use std::process::{exit, Command};
  29
  30 fn show_version() {
  31     println!(env!("CARGO_PKG_VERSION"));
  32 }
  33
  34 pub fn main() {
  35     rustc_driver::init_rustc_env_logger();
  36     exit(rustc_driver::run(move || {
  37         use std::env;
  38
  39         if std::env::args().any(|a| a == "--version" || a == "-V") {
  40             show_version();
  41             exit(0);
  42         }
  43
  44         let sys_root = option_env!("SYSROOT")
  45             .map(String::from)
  46             .or_else(|| std::env::var("SYSROOT").ok())
  47             .or_else(|| {
  48                 let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
  49                 let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
  50                 home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
  51             })
  52             .or_else(|| {
  53                 Command::new("rustc")
  54                     .arg("--print")
  55                     .arg("sysroot")
  56                     .output()
  57                     .ok()
  58                     .and_then(|out| String::from_utf8(out.stdout).ok())
  59                     .map(|s| s.trim().to_owned())
  60             })
  61             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
  62
  63         // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
  64         // We're invoking the compiler programmatically, so we ignore this/
  65         let mut orig_args: Vec<String> = env::args().collect();
  66         if orig_args.len() <= 1 {
  67             std::process::exit(1);
  68         }
  69         if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
  70             // we still want to be able to invoke it normally though
  71             orig_args.remove(1);
  72         }
  73         // this conditional check for the --sysroot flag is there so users can call
  74         // `clippy_driver` directly
  75         // without having to pass --sysroot or anything
  76         let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
  77             orig_args.clone()
  78         } else {
  79             orig_args
  80                 .clone()
  81                 .into_iter()
  82                 .chain(Some("--sysroot".to_owned()))
  83                 .chain(Some(sys_root))
  84                 .collect()
  85         };
  86
  87         // this check ensures that dependencies are built but not linted and the final
  88         // crate is
  89         // linted but not built
  90         let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
  91             || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
  92
  93         if clippy_enabled {
  94             args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
  95             if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
  96                 args.extend(
  97                     extra_args
  98                         .split("__CLIPPY_HACKERY__")
  99                         .filter_map(|s| if s.is_empty() {
 100                             None
 101                         } else {
 102                             Some(s.to_string())
 103                         })
 104                 );
 105             }
 106         }
 107
 108         let mut controller = CompileController::basic();
 109         if clippy_enabled {
 110             controller.after_parse.callback = Box::new(move |state| {
 111                 let mut registry = rustc_plugin::registry::Registry::new(
 112                     state.session,
 113                     state
 114                         .krate
 115                         .as_ref()
 116                         .expect(
 117                             "at this compilation stage \
 118                             the crate must be parsed",
 119                         )
 120                         .span,
 121                 );
 122                 registry.args_hidden = Some(Vec::new());
 123
 124                 let conf = clippy_lints::read_conf(&registry);
 125                 clippy_lints::register_plugins(&mut registry, &conf);
 126
 127                 let rustc_plugin::registry::Registry {
 128                     early_lint_passes,
 129                     late_lint_passes,
 130                     lint_groups,
 131                     llvm_passes,
 132                     attributes,
 133                     ..
 134                 } = registry;
 135                 let sess = &state.session;
 136                 let mut ls = sess.lint_store.borrow_mut();
 137                 for pass in early_lint_passes {
 138                     ls.register_early_pass(Some(sess), true, pass);
 139                 }
 140                 for pass in late_lint_passes {
 141                     ls.register_late_pass(Some(sess), true, pass);
 142                 }
 143
 144                 for (name, (to, deprecated_name)) in lint_groups {
 145                     ls.register_group(Some(sess), true, name, deprecated_name, to);
 146                 }
 147                 clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
 148
 149                 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 150                 sess.plugin_attributes.borrow_mut().extend(attributes);
 151             });
 152         }
 153         controller.compilation_done.stop = Compilation::Stop;
 154
 155         let args = args;
 156         rustc_driver::run_compiler(&args, Box::new(controller), None, None)
 157     }).try_into().expect("exit code too large"))
 158 }