src/main.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4 #![feature(slice_patterns)]
   5
   6 extern crate rustc_driver;
   7 extern crate getopts;
   8 extern crate rustc;
   9 extern crate syntax;
  10 extern crate rustc_plugin;
  11 extern crate clippy_lints;
  12 extern crate rustc_serialize;
  13
  14 use rustc_driver::{driver, CompilerCalls, RustcDefaultCalls, Compilation};
  15 use rustc::session::{config, Session};
  16 use rustc::session::config::{Input, ErrorOutputType};
  17 use syntax::diagnostics;
  18 use std::path::PathBuf;
  19 use std::process::Command;
  20
  21 use clippy_lints::utils::cargo;
  22
  23 struct ClippyCompilerCalls(RustcDefaultCalls);
  24
  25 impl std::default::Default for ClippyCompilerCalls {
  26     fn default() -> Self {
  27         Self::new()
  28     }
  29 }
  30
  31 impl ClippyCompilerCalls {
  32     fn new() -> Self {
  33         ClippyCompilerCalls(RustcDefaultCalls)
  34     }
  35 }
  36
  37 impl<'a> CompilerCalls<'a> for ClippyCompilerCalls {
  38     fn early_callback(&mut self,
  39                       matches: &getopts::Matches,
  40                       sopts: &config::Options,
  41                       descriptions: &diagnostics::registry::Registry,
  42                       output: ErrorOutputType)
  43                       -> Compilation {
  44         self.0.early_callback(matches, sopts, descriptions, output)
  45     }
  46     fn no_input(&mut self,
  47                 matches: &getopts::Matches,
  48                 sopts: &config::Options,
  49                 odir: &Option<PathBuf>,
  50                 ofile: &Option<PathBuf>,
  51                 descriptions: &diagnostics::registry::Registry)
  52                 -> Option<(Input, Option<PathBuf>)> {
  53         self.0.no_input(matches, sopts, odir, ofile, descriptions)
  54     }
  55     fn late_callback(&mut self,
  56                      matches: &getopts::Matches,
  57                      sess: &Session,
  58                      input: &Input,
  59                      odir: &Option<PathBuf>,
  60                      ofile: &Option<PathBuf>)
  61                      -> Compilation {
  62         self.0.late_callback(matches, sess, input, odir, ofile)
  63     }
  64     fn build_controller(&mut self, sess: &Session, matches: &getopts::Matches) -> driver::CompileController<'a> {
  65         let mut control = self.0.build_controller(sess, matches);
  66
  67         let old = std::mem::replace(&mut control.after_parse.callback, box |_| {});
  68         control.after_parse.callback = Box::new(move |state| {
  69             {
  70                 let mut registry = rustc_plugin::registry::Registry::new(state.session, state.krate.as_ref().expect("at this compilation stage the krate must be parsed"));
  71                 registry.args_hidden = Some(Vec::new());
  72                 clippy_lints::register_plugins(&mut registry);
  73
  74                 let rustc_plugin::registry::Registry { early_lint_passes,
  75                                                        late_lint_passes,
  76                                                        lint_groups,
  77                                                        llvm_passes,
  78                                                        attributes,
  79                                                        mir_passes,
  80                                                        .. } = registry;
  81                 let sess = &state.session;
  82                 let mut ls = sess.lint_store.borrow_mut();
  83                 for pass in early_lint_passes {
  84                     ls.register_early_pass(Some(sess), true, pass);
  85                 }
  86                 for pass in late_lint_passes {
  87                     ls.register_late_pass(Some(sess), true, pass);
  88                 }
  89
  90                 for (name, to) in lint_groups {
  91                     ls.register_group(Some(sess), true, name, to);
  92                 }
  93
  94                 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
  95                 sess.mir_passes.borrow_mut().extend(mir_passes);
  96                 sess.plugin_attributes.borrow_mut().extend(attributes);
  97             }
  98             old(state);
  99         });
 100
 101         control
 102     }
 103 }
 104
 105 use std::path::Path;
 106
 107 pub fn main() {
 108     use std::env;
 109
 110     if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
 111         panic!("yummy");
 112     }
 113
 114     let dep_path = env::current_dir().expect("current dir is not readable").join("target").join("debug").join("deps");
 115
 116     let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
 117     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
 118     let sys_root = if let (Some(home), Some(toolchain)) = (home, toolchain) {
 119         format!("{}/toolchains/{}", home, toolchain)
 120     } else {
 121         option_env!("SYSROOT")
 122             .map(|s| s.to_owned())
 123             .or(Command::new("rustc")
 124                 .arg("--print")
 125                 .arg("sysroot")
 126                 .output()
 127                 .ok()
 128                 .and_then(|out| String::from_utf8(out.stdout).ok())
 129                 .map(|s| s.trim().to_owned()))
 130             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust")
 131     };
 132
 133     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
 134         let mut metadata = cargo::metadata().expect("could not obtain cargo metadata");
 135         assert_eq!(metadata.version, 1);
 136         for target in metadata.packages.remove(0).targets {
 137             let args = std::env::args().skip(2);
 138             if let Some(first) = target.kind.get(0) {
 139                 if target.kind.len() > 1 || first.ends_with("lib") {
 140                     if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args), &dep_path, &sys_root) {
 141                         std::process::exit(code);
 142                     }
 143                 } else if first == "bin" {
 144                     if let Err(code) = process(vec!["--bin".to_owned(), target.name].into_iter().chain(args), &dep_path, &sys_root) {
 145                         std::process::exit(code);
 146                     }
 147                 }
 148             } else {
 149                 panic!("badly formatted cargo metadata: target::kind is an empty array");
 150             }
 151         }
 152     } else {
 153         let mut args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
 154             env::args().collect()
 155         } else {
 156             env::args().chain(Some("--sysroot".to_owned())).chain(Some(sys_root)).collect()
 157         };
 158
 159         args.extend_from_slice(&["--cfg".to_owned(), r#"feature="clippy""#.to_owned()]);
 160
 161         let (result, _) = rustc_driver::run_compiler(&args, &mut ClippyCompilerCalls::new());
 162
 163         if let Err(err_count) = result {
 164             if err_count > 0 {
 165                 std::process::exit(1);
 166             }
 167         }
 168     }
 169 }
 170
 171 fn process<P, I>(old_args: I, dep_path: P, sysroot: &str) -> Result<(), i32>
 172     where P: AsRef<Path>,
 173           I: Iterator<Item = String>
 174 {
 175
 176     let mut args = vec!["rustc".to_owned()];
 177
 178     let mut found_dashes = false;
 179     for arg in old_args {
 180         found_dashes |= arg == "--";
 181         args.push(arg);
 182     }
 183     if !found_dashes {
 184         args.push("--".to_owned());
 185     }
 186     args.push("-L".to_owned());
 187     args.push(dep_path.as_ref().to_string_lossy().into_owned());
 188     args.push(String::from("--sysroot"));
 189     args.push(sysroot.to_owned());
 190     args.push("-Zno-trans".to_owned());
 191     args.push("--cfg".to_owned());
 192     args.push(r#"feature="clippy""#.to_owned());
 193
 194     let path = std::env::current_exe().expect("current executable path invalid");
 195     let exit_status = std::process::Command::new("cargo")
 196         .args(&args)
 197         .env("RUSTC", path)
 198         .spawn().expect("could not run cargo")
 199         .wait().expect("failed to wait for cargo?");
 200
 201     if exit_status.success() {
 202         Ok(())
 203     } else {
 204         Err(exit_status.code().unwrap_or(-1))
 205     }
 206 }