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 use rustc_driver::{self, driver::CompileController, Compilation};
   8 use rustc_plugin;
   9 use std::path::Path;
  10 use std::process::{exit, Command};
  11
  12 #[allow(clippy::print_stdout)]
  13 fn show_version() {
  14     println!(env!("CARGO_PKG_VERSION"));
  15 }
  16
  17 pub fn main() {
  18     exit(rustc_driver::run(move || {
  19         use std::env;
  20
  21         if std::env::args().any(|a| a == "--version" || a == "-V") {
  22             show_version();
  23             exit(0);
  24         }
  25
  26         let sys_root = option_env!("SYSROOT")
  27             .map(String::from)
  28             .or_else(|| std::env::var("SYSROOT").ok())
  29             .or_else(|| {
  30                 let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
  31                 let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
  32                 home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
  33             })
  34             .or_else(|| {
  35                 Command::new("rustc")
  36                     .arg("--print")
  37                     .arg("sysroot")
  38                     .output()
  39                     .ok()
  40                     .and_then(|out| String::from_utf8(out.stdout).ok())
  41                     .map(|s| s.trim().to_owned())
  42             })
  43             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
  44
  45         // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
  46         // We're invoking the compiler programmatically, so we ignore this/
  47         let mut orig_args: Vec<String> = env::args().collect();
  48         if orig_args.len() <= 1 {
  49             std::process::exit(1);
  50         }
  51         if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
  52             // we still want to be able to invoke it normally though
  53             orig_args.remove(1);
  54         }
  55         // this conditional check for the --sysroot flag is there so users can call
  56         // `clippy_driver` directly
  57         // without having to pass --sysroot or anything
  58         let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
  59             orig_args.clone()
  60         } else {
  61             orig_args
  62                 .clone()
  63                 .into_iter()
  64                 .chain(Some("--sysroot".to_owned()))
  65                 .chain(Some(sys_root))
  66                 .collect()
  67         };
  68
  69         // this check ensures that dependencies are built but not linted and the final
  70         // crate is
  71         // linted but not built
  72         let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
  73             || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
  74
  75         if clippy_enabled {
  76             args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
  77             if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
  78                 args.extend(
  79                     extra_args
  80                         .split("__CLIPPY_HACKERY__")
  81                         .filter_map(|s| if s.is_empty() {
  82                             None
  83                         } else {
  84                             Some(s.to_string())
  85                         })
  86                 );
  87             }
  88         }
  89
  90         let mut controller = CompileController::basic();
  91         if clippy_enabled {
  92             controller.after_parse.callback = Box::new(move |state| {
  93                 let mut registry = rustc_plugin::registry::Registry::new(
  94                     state.session,
  95                     state
  96                         .krate
  97                         .as_ref()
  98                         .expect(
  99                             "at this compilation stage \
 100                             the crate must be parsed",
 101                         )
 102                         .span,
 103                 );
 104                 registry.args_hidden = Some(Vec::new());
 105
 106                 let conf = clippy_lints::read_conf(&registry);
 107                 clippy_lints::register_plugins(&mut registry, &conf);
 108
 109                 let rustc_plugin::registry::Registry {
 110                     early_lint_passes,
 111                     late_lint_passes,
 112                     lint_groups,
 113                     llvm_passes,
 114                     attributes,
 115                     ..
 116                 } = registry;
 117                 let sess = &state.session;
 118                 let mut ls = sess.lint_store.borrow_mut();
 119                 for pass in early_lint_passes {
 120                     ls.register_early_pass(Some(sess), true, pass);
 121                 }
 122                 for pass in late_lint_passes {
 123                     ls.register_late_pass(Some(sess), true, pass);
 124                 }
 125
 126                 for (name, (to, deprecated_name)) in lint_groups {
 127                     ls.register_group(Some(sess), true, name, deprecated_name, to);
 128                 }
 129                 clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
 130
 131                 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 132                 sess.plugin_attributes.borrow_mut().extend(attributes);
 133             });
 134         }
 135         controller.compilation_done.stop = Compilation::Stop;
 136
 137         let args = args;
 138         rustc_driver::run_compiler(&args, Box::new(controller), None, None)
 139     }) as i32)
 140 }