src/driver.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4 #![allow(unknown_lints, missing_docs_in_private_items)]
   5
   6 use rustc_driver::{self, driver::CompileController, Compilation};
   7 use rustc_plugin;
   8 use std::process::{exit, Command};
   9
  10 #[allow(print_stdout)]
  11 fn show_version() {
  12     println!(env!("CARGO_PKG_VERSION"));
  13 }
  14
  15 pub fn main() {
  16     use std::env;
  17
  18     if std::env::args().any(|a| a == "--version" || a == "-V") {
  19         show_version();
  20         return;
  21     }
  22
  23     let sys_root = option_env!("SYSROOT")
  24         .map(String::from)
  25         .or_else(|| std::env::var("SYSROOT").ok())
  26         .or_else(|| {
  27             let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
  28             let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
  29             home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
  30         })
  31         .or_else(|| {
  32             Command::new("rustc")
  33                 .arg("--print")
  34                 .arg("sysroot")
  35                 .output()
  36                 .ok()
  37                 .and_then(|out| String::from_utf8(out.stdout).ok())
  38                 .map(|s| s.trim().to_owned())
  39         })
  40         .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
  41
  42     // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
  43     // We're invoking the compiler programmatically, so we ignore this/
  44     let mut orig_args: Vec<String> = env::args().collect();
  45     if orig_args.len() <= 1 {
  46         std::process::exit(1);
  47     }
  48     if orig_args[1] == "rustc" {
  49         // we still want to be able to invoke it normally though
  50         orig_args.remove(1);
  51     }
  52     // this conditional check for the --sysroot flag is there so users can call
  53     // `clippy_driver` directly
  54     // without having to pass --sysroot or anything
  55     let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
  56         orig_args.clone()
  57     } else {
  58         orig_args
  59             .clone()
  60             .into_iter()
  61             .chain(Some("--sysroot".to_owned()))
  62             .chain(Some(sys_root))
  63             .collect()
  64     };
  65
  66     // this check ensures that dependencies are built but not linted and the final
  67     // crate is
  68     // linted but not built
  69     let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
  70         || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
  71
  72     if clippy_enabled {
  73         args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
  74         if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
  75             args.extend(
  76                 extra_args
  77                     .split("__CLIPPY_HACKERY__")
  78                     .filter(|s| !s.is_empty())
  79                     .map(str::to_owned),
  80             );
  81         }
  82     }
  83
  84     let mut controller = CompileController::basic();
  85     if clippy_enabled {
  86         controller.after_parse.callback = Box::new(move |state| {
  87             let mut registry = rustc_plugin::registry::Registry::new(
  88                 state.session,
  89                 state
  90                     .krate
  91                     .as_ref()
  92                     .expect(
  93                         "at this compilation stage \
  94                          the crate must be parsed",
  95                     )
  96                     .span,
  97             );
  98             registry.args_hidden = Some(Vec::new());
  99             clippy_lints::register_plugins(&mut registry);
 100
 101             let rustc_plugin::registry::Registry {
 102                 early_lint_passes,
 103                 late_lint_passes,
 104                 lint_groups,
 105                 llvm_passes,
 106                 attributes,
 107                 ..
 108             } = registry;
 109             let sess = &state.session;
 110             let mut ls = sess.lint_store.borrow_mut();
 111             for pass in early_lint_passes {
 112                 ls.register_early_pass(Some(sess), true, pass);
 113             }
 114             for pass in late_lint_passes {
 115                 ls.register_late_pass(Some(sess), true, pass);
 116             }
 117
 118             for (name, to) in lint_groups {
 119                 ls.register_group(Some(sess), true, name, to);
 120             }
 121             clippy_lints::register_pre_expansion_lints(sess, &mut ls);
 122
 123             sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 124             sess.plugin_attributes.borrow_mut().extend(attributes);
 125         });
 126     }
 127     controller.compilation_done.stop = Compilation::Stop;
 128
 129     if rustc_driver::run_compiler(&args, Box::new(controller), None, None)
 130         .0
 131         .is_err()
 132     {
 133         exit(101);
 134     }
 135 }