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