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, late_lint_passes, lint_groups, llvm_passes, attributes, mir_passes, .. } = registry;
  75                 let sess = &state.session;
  76                 let mut ls = sess.lint_store.borrow_mut();
  77                 for pass in early_lint_passes {
  78                     ls.register_early_pass(Some(sess), true, pass);
  79                 }
  80                 for pass in late_lint_passes {
  81                     ls.register_late_pass(Some(sess), true, pass);
  82                 }
  83
  84                 for (name, to) in lint_groups {
  85                     ls.register_group(Some(sess), true, name, to);
  86                 }
  87
  88                 sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
  89                 sess.mir_passes.borrow_mut().extend(mir_passes);
  90                 sess.plugin_attributes.borrow_mut().extend(attributes);
  91             }
  92             old(state);
  93         });
  94
  95         control
  96     }
  97 }
  98
  99 use std::path::Path;
 100
 101 pub fn main() {
 102     use std::env;
 103
 104     if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
 105         panic!("yummy");
 106     }
 107
 108     let dep_path = env::current_dir().expect("current dir is not readable").join("target").join("debug").join("deps");
 109
 110     let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
 111     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
 112     let sys_root = match (home, toolchain) {
 113         (Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
 114         _ => option_env!("SYSROOT").map(|s| s.to_owned())
 115                                    .or(Command::new("rustc").arg("--print")
 116                                                             .arg("sysroot")
 117                                                             .output().ok()
 118                                                             .and_then(|out| String::from_utf8(out.stdout).ok())
 119                                                             .map(|s| s.trim().to_owned())
 120                                                             )
 121                 .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust"),
 122     };
 123
 124     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
 125         let mut metadata = cargo::metadata().expect("could not obtain cargo metadata");
 126         assert_eq!(metadata.version, 1);
 127         for target in metadata.packages.remove(0).targets {
 128             let args = std::env::args().skip(2);
 129             if let Some(first) = target.kind.get(0) {
 130                 if target.kind.len() > 1 || first.ends_with("lib") {
 131                     if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args), &dep_path, &sys_root) {
 132                         std::process::exit(code);
 133                     }
 134                 } else if first == "bin" {
 135                     if let Err(code) = process(vec!["--bin".to_owned(), target.name].into_iter().chain(args), &dep_path, &sys_root) {
 136                         std::process::exit(code);
 137                     }
 138                 }
 139             } else {
 140                 panic!("badly formatted cargo metadata: target::kind is an empty array");
 141             }
 142         }
 143     } else {
 144         let mut args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
 145             env::args().collect()
 146         } else {
 147             env::args().chain(Some("--sysroot".to_owned())).chain(Some(sys_root)).collect()
 148         };
 149
 150         args.extend_from_slice(&["--cfg".to_owned(), r#"feature="clippy""#.to_owned()]);
 151
 152         let (result, _) = rustc_driver::run_compiler(&args, &mut ClippyCompilerCalls::new());
 153
 154         if let Err(err_count) = result {
 155             if err_count > 0 {
 156                 std::process::exit(1);
 157             }
 158         }
 159     }
 160 }
 161
 162 fn process<P, I>(old_args: I, dep_path: P, sysroot: &str) -> Result<(), i32>
 163     where P: AsRef<Path>, I: Iterator<Item=String> {
 164
 165     let mut args = vec!["rustc".to_owned()];
 166
 167     let mut found_dashes = false;
 168     for arg in old_args {
 169         found_dashes |= arg == "--";
 170         args.push(arg);
 171     }
 172     if !found_dashes {
 173         args.push("--".to_owned());
 174     }
 175     args.push("-L".to_owned());
 176     args.push(dep_path.as_ref().to_string_lossy().into_owned());
 177     args.push(String::from("--sysroot"));
 178     args.push(sysroot.to_owned());
 179     args.push("-Zno-trans".to_owned());
 180     args.push("--cfg".to_owned());
 181     args.push(r#"feature="clippy""#.to_owned());
 182
 183     let path = std::env::current_exe().expect("current executable path invalid");
 184     let exit_status = std::process::Command::new("cargo")
 185         .args(&args)
 186         .env("RUSTC", path)
 187         .spawn().expect("could not run cargo")
 188         .wait().expect("failed to wait for cargo?");
 189
 190     if exit_status.success() {
 191         Ok(())
 192     } else {
 193         Err(exit_status.code().unwrap_or(-1))
 194     }
 195 }