src/main.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4
   5 extern crate clippy_lints;
   6 extern crate getopts;
   7 extern crate rustc;
   8 extern crate rustc_driver;
   9 extern crate rustc_errors;
  10 extern crate rustc_plugin;
  11 extern crate syntax;
  12
  13 use rustc_driver::{driver, CompilerCalls, RustcDefaultCalls, Compilation};
  14 use rustc::session::{config, Session};
  15 use rustc::session::config::{Input, ErrorOutputType};
  16 use std::path::PathBuf;
  17 use std::process::Command;
  18 use syntax::ast;
  19
  20 use clippy_lints::utils::cargo;
  21
  22 struct ClippyCompilerCalls {
  23     default: RustcDefaultCalls,
  24     run_lints: bool,
  25 }
  26
  27 impl ClippyCompilerCalls {
  28     fn new(run_lints: bool) -> Self {
  29         ClippyCompilerCalls {
  30             default: RustcDefaultCalls,
  31             run_lints: run_lints,
  32         }
  33     }
  34 }
  35
  36 impl<'a> CompilerCalls<'a> for ClippyCompilerCalls {
  37     fn early_callback(&mut self,
  38                       matches: &getopts::Matches,
  39                       sopts: &config::Options,
  40                       cfg: &ast::CrateConfig,
  41                       descriptions: &rustc_errors::registry::Registry,
  42                       output: ErrorOutputType)
  43                       -> Compilation {
  44         self.default.early_callback(matches, sopts, cfg, descriptions, output)
  45     }
  46     fn no_input(&mut self,
  47                 matches: &getopts::Matches,
  48                 sopts: &config::Options,
  49                 cfg: &ast::CrateConfig,
  50                 odir: &Option<PathBuf>,
  51                 ofile: &Option<PathBuf>,
  52                 descriptions: &rustc_errors::registry::Registry)
  53                 -> Option<(Input, Option<PathBuf>)> {
  54         self.default.no_input(matches, sopts, cfg, odir, ofile, descriptions)
  55     }
  56     fn late_callback(&mut self,
  57                      matches: &getopts::Matches,
  58                      sess: &Session,
  59                      cfg: &ast::CrateConfig,
  60                      input: &Input,
  61                      odir: &Option<PathBuf>,
  62                      ofile: &Option<PathBuf>)
  63                      -> Compilation {
  64         self.default.late_callback(matches, sess, cfg, input, odir, ofile)
  65     }
  66     fn build_controller(&mut self, sess: &Session, matches: &getopts::Matches) -> driver::CompileController<'a> {
  67         let mut control = self.default.build_controller(sess, matches);
  68
  69         if self.run_lints {
  70             let old = std::mem::replace(&mut control.after_parse.callback, box |_| {});
  71             control.after_parse.callback = Box::new(move |state| {
  72                 {
  73                     let mut registry = rustc_plugin::registry::Registry::new(state.session, state.krate.as_ref().expect("at this compilation stage the krate must be parsed"));
  74                     registry.args_hidden = Some(Vec::new());
  75                     clippy_lints::register_plugins(&mut registry);
  76
  77                     let rustc_plugin::registry::Registry { early_lint_passes,
  78                                                            late_lint_passes,
  79                                                            lint_groups,
  80                                                            llvm_passes,
  81                                                            attributes,
  82                                                            mir_passes,
  83                                                            .. } = registry;
  84                     let sess = &state.session;
  85                     let mut ls = sess.lint_store.borrow_mut();
  86                     for pass in early_lint_passes {
  87                         ls.register_early_pass(Some(sess), true, pass);
  88                     }
  89                     for pass in late_lint_passes {
  90                         ls.register_late_pass(Some(sess), true, pass);
  91                     }
  92
  93                     for (name, to) in lint_groups {
  94                         ls.register_group(Some(sess), true, name, to);
  95                     }
  96
  97                     sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
  98                     sess.mir_passes.borrow_mut().extend(mir_passes);
  99                     sess.plugin_attributes.borrow_mut().extend(attributes);
 100                 }
 101                 old(state);
 102             });
 103         }
 104
 105         control
 106     }
 107 }
 108
 109 use std::path::Path;
 110
 111 pub fn main() {
 112     use std::env;
 113
 114     if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
 115         panic!("yummy");
 116     }
 117
 118     let dep_path = env::current_dir().expect("current dir is not readable").join("target").join("debug").join("deps");
 119
 120     let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
 121     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
 122     let sys_root = if let (Some(home), Some(toolchain)) = (home, toolchain) {
 123         format!("{}/toolchains/{}", home, toolchain)
 124     } else {
 125         option_env!("SYSROOT")
 126             .map(|s| s.to_owned())
 127             .or(Command::new("rustc")
 128                 .arg("--print")
 129                 .arg("sysroot")
 130                 .output()
 131                 .ok()
 132                 .and_then(|out| String::from_utf8(out.stdout).ok())
 133                 .map(|s| s.trim().to_owned()))
 134             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust")
 135     };
 136
 137     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
 138         // this arm is executed on the initial call to `cargo clippy`
 139         let manifest_path = std::env::args().skip(2).find(|val| val.starts_with("--manifest-path="));
 140         let mut metadata = cargo::metadata(manifest_path).expect("could not obtain cargo metadata");
 141         assert_eq!(metadata.version, 1);
 142         for target in metadata.packages.remove(0).targets {
 143             let args = std::env::args().skip(2);
 144             if let Some(first) = target.kind.get(0) {
 145                 if target.kind.len() > 1 || first.ends_with("lib") {
 146                     if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args), &dep_path, &sys_root) {
 147                         std::process::exit(code);
 148                     }
 149                 } else if first == "bin" {
 150                     if let Err(code) = process(vec!["--bin".to_owned(), target.name].into_iter().chain(args), &dep_path, &sys_root) {
 151                         std::process::exit(code);
 152                     }
 153                 }
 154             } else {
 155                 panic!("badly formatted cargo metadata: target::kind is an empty array");
 156             }
 157         }
 158     } else {
 159         // this arm is executed when cargo-clippy runs `cargo rustc` with the `RUSTC` env var set to itself
 160
 161         // this conditional check for the --sysroot flag is there so users can call `cargo-clippy` directly
 162         // without having to pass --sysroot or anything
 163         let args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
 164             env::args().collect()
 165         } else {
 166             env::args().chain(Some("--sysroot".to_owned())).chain(Some(sys_root)).collect()
 167         };
 168         // this check ensures that dependencies are built but not linted and the final crate is
 169         // linted but not built
 170         let mut ccc = ClippyCompilerCalls::new(env::args().any(|s| s == "-Zno-trans"));
 171         let (result, _) = rustc_driver::run_compiler(&args, &mut ccc);
 172
 173         if let Err(err_count) = result {
 174             if err_count > 0 {
 175                 std::process::exit(1);
 176             }
 177         }
 178     }
 179 }
 180
 181 fn process<P, I>(old_args: I, dep_path: P, sysroot: &str) -> Result<(), i32>
 182     where P: AsRef<Path>,
 183           I: Iterator<Item = String>
 184 {
 185
 186     let mut args = vec!["rustc".to_owned()];
 187
 188     let mut found_dashes = false;
 189     for arg in old_args {
 190         found_dashes |= arg == "--";
 191         args.push(arg);
 192     }
 193     if !found_dashes {
 194         args.push("--".to_owned());
 195     }
 196     args.push("-L".to_owned());
 197     args.push(dep_path.as_ref().to_string_lossy().into_owned());
 198     args.push(String::from("--sysroot"));
 199     args.push(sysroot.to_owned());
 200     args.push("-Zno-trans".to_owned());
 201
 202     let path = std::env::current_exe().expect("current executable path invalid");
 203     let exit_status = std::process::Command::new("cargo")
 204         .args(&args)
 205         .env("RUSTC", path)
 206         .spawn().expect("could not run cargo")
 207         .wait().expect("failed to wait for cargo?");
 208
 209     if exit_status.success() {
 210         Ok(())
 211     } else {
 212         Err(exit_status.code().unwrap_or(-1))
 213     }
 214 }