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