src/driver.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4 #![feature(tool_lints)]
   5 #![allow(unknown_lints, clippy::missing_docs_in_private_items)]
   6
   7 // FIXME: switch to something more ergonomic here, once available.
   8 // (currently there is no way to opt into sysroot crates w/o `extern crate`)
   9 #[allow(unused_extern_crates)]
  10 extern crate rustc_driver;
  11 #[allow(unused_extern_crates)]
  12 extern crate rustc_plugin;
  13 use self::rustc_driver::{driver::CompileController, Compilation};
  14
  15 use std::path::Path;
  16 use std::process::{exit, Command};
  17
  18 #[allow(clippy::print_stdout)]
  19 fn show_version() {
  20     println!(env!("CARGO_PKG_VERSION"));
  21 }
  22
  23 pub fn main() {
  24     exit(rustc_driver::run(move || {
  25         use std::env;
  26
  27         if std::env::args().any(|a| a == "--version" || a == "-V") {
  28             show_version();
  29             exit(0);
  30         }
  31
  32         let sys_root = option_env!("SYSROOT")
  33             .map(String::from)
  34             .or_else(|| std::env::var("SYSROOT").ok())
  35             .or_else(|| {
  36                 let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
  37                 let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
  38                 home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
  39             })
  40             .or_else(|| {
  41                 Command::new("rustc")
  42                     .arg("--print")
  43                     .arg("sysroot")
  44                     .output()
  45                     .ok()
  46                     .and_then(|out| String::from_utf8(out.stdout).ok())
  47                     .map(|s| s.trim().to_owned())
  48             })
  49             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
  50
  51         // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
  52         // We're invoking the compiler programmatically, so we ignore this/
  53         let mut orig_args: Vec<String> = env::args().collect();
  54         if orig_args.len() <= 1 {
  55             std::process::exit(1);
  56         }
  57         if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
  58             // we still want to be able to invoke it normally though
  59             orig_args.remove(1);
  60         }
  61         // this conditional check for the --sysroot flag is there so users can call
  62         // `clippy_driver` directly
  63         // without having to pass --sysroot or anything
  64         let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
  65             orig_args.clone()
  66         } else {
  67             orig_args
  68                 .clone()
  69                 .into_iter()
  70                 .chain(Some("--sysroot".to_owned()))
  71                 .chain(Some(sys_root))
  72                 .collect()
  73         };
  74
  75         // this check ensures that dependencies are built but not linted and the final
  76         // crate is
  77         // linted but not built
  78         let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
  79             || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
  80
  81         if clippy_enabled {
  82             args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
  83             if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
  84                 args.extend(
  85                     extra_args
  86                         .split("__CLIPPY_HACKERY__")
  87                         .filter_map(|s| if s.is_empty() {
  88                             None
  89                         } else {
  90                             Some(s.to_string())
  91                         })
  92                 );
  93             }
  94         }
  95
  96         let mut controller = CompileController::basic();
  97         if clippy_enabled {
  98             controller.after_parse.callback = Box::new(move |state| {
  99                 let mut registry = rustc_plugin::registry::Registry::new(
 100                     state.session,
 101                     state
 102                         .krate
 103                         .as_ref()
 104                         .expect(
 105                             "at this compilation stage \
 106                             the crate must be parsed",
 107                         )
 108                         .span,
 109                 );
 110                 registry.args_hidden = Some(Vec::new());
 111
 112                 let conf = clippy_lints::read_conf(&registry);
 113                 clippy_lints::register_plugins(&mut registry, &conf);
 114
 115                 let rustc_plugin::registry::Registry {
 116                     early_lint_passes,
 117                     late_lint_passes,
 118                     lint_groups,
 119                     llvm_passes,
 120                     attributes,
 121                     ..
 122                 } = registry;
 123                 let sess = &state.session;
 124                 let mut ls = sess.lint_store.borrow_mut();
 125                 for pass in early_lint_passes {
 126                     ls.register_early_pass(Some(sess), true, pass);
 127                 }
 128                 for pass in late_lint_passes {
 129                     ls.register_late_pass(Some(sess), true, pass);
 130                 }
 131
 132                 for (name, (to, deprecated_name)) in lint_groups {
 133                     ls.register_group(Some(sess), true, name, deprecated_name, to);
 134                 }
 135                 clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
 136
 137                 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 138                 sess.plugin_attributes.borrow_mut().extend(attributes);
 139             });
 140         }
 141         controller.compilation_done.stop = Compilation::Stop;
 142
 143         let args = args;
 144         rustc_driver::run_compiler(&args, Box::new(controller), None, None)
 145     }) as i32)
 146 }