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 extern crate clippy_lints;
   7 extern crate getopts;
   8 extern crate rustc;
   9 extern crate rustc_codegen_utils;
  10 extern crate rustc_driver;
  11 extern crate rustc_errors;
  12 extern crate rustc_plugin;
  13 extern crate syntax;
  14
  15 use rustc_driver::{driver::CompileController, Compilation};
  16 use std::process::{exit, Command};
  17
  18 #[allow(print_stdout)]
  19 fn show_version() {
  20     println!(env!("CARGO_PKG_VERSION"));
  21 }
  22
  23 pub fn main() {
  24     use std::env;
  25
  26     if std::env::args().any(|a| a == "--version" || a == "-V") {
  27         show_version();
  28         return;
  29     }
  30
  31     let sys_root = option_env!("SYSROOT")
  32         .map(String::from)
  33         .or_else(|| std::env::var("SYSROOT").ok())
  34         .or_else(|| {
  35             let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
  36             let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
  37             home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
  38         })
  39         .or_else(|| {
  40             Command::new("rustc")
  41                 .arg("--print")
  42                 .arg("sysroot")
  43                 .output()
  44                 .ok()
  45                 .and_then(|out| String::from_utf8(out.stdout).ok())
  46                 .map(|s| s.trim().to_owned())
  47         })
  48         .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
  49
  50     // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
  51     // We're invoking the compiler programmatically, so we ignore this/
  52     let mut orig_args: Vec<String> = env::args().collect();
  53     if orig_args.len() <= 1 {
  54         std::process::exit(1);
  55     }
  56     if orig_args[1] == "rustc" {
  57         // we still want to be able to invoke it normally though
  58         orig_args.remove(1);
  59     }
  60     // this conditional check for the --sysroot flag is there so users can call
  61     // `clippy_driver` directly
  62     // without having to pass --sysroot or anything
  63     let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
  64         orig_args.clone()
  65     } else {
  66         orig_args
  67             .clone()
  68             .into_iter()
  69             .chain(Some("--sysroot".to_owned()))
  70             .chain(Some(sys_root))
  71             .collect()
  72     };
  73
  74     // this check ensures that dependencies are built but not linted and the final
  75     // crate is
  76     // linted but not built
  77     let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
  78         || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
  79
  80     if clippy_enabled {
  81         args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
  82         if let Ok(extra_args) = env::var("CLIPPY_ARGS") {
  83             args.extend(
  84                 extra_args
  85                     .split("__CLIPPY_HACKERY__")
  86                     .filter(|s| !s.is_empty())
  87                     .map(str::to_owned),
  88             );
  89         }
  90     }
  91
  92     let mut controller = CompileController::basic();
  93     if clippy_enabled {
  94         controller.after_parse.callback = Box::new(move |state| {
  95             let mut registry = rustc_plugin::registry::Registry::new(
  96                 state.session,
  97                 state
  98                     .krate
  99                     .as_ref()
 100                     .expect(
 101                         "at this compilation stage \
 102                          the crate must be parsed",
 103                     )
 104                     .span,
 105             );
 106             registry.args_hidden = Some(Vec::new());
 107             clippy_lints::register_plugins(&mut registry);
 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) in lint_groups {
 127                 ls.register_group(Some(sess), true, name, to);
 128             }
 129
 130             sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 131             sess.plugin_attributes.borrow_mut().extend(attributes);
 132         });
 133     }
 134     controller.compilation_done.stop = Compilation::Stop;
 135
 136     if rustc_driver::run_compiler(&args, Box::new(controller), None, None)
 137         .0
 138         .is_err()
 139     {
 140         exit(101);
 141     }
 142 }