src/main.rs

   1 // error-pattern:yummy
   2 #![feature(box_syntax)]
   3 #![feature(rustc_private)]
   4
   5 #![allow(unknown_lints, missing_docs_in_private_items)]
   6
   7 extern crate clippy_lints;
   8 extern crate getopts;
   9 extern crate rustc;
  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, CompilerCalls, RustcDefaultCalls, Compilation};
  16 use rustc::session::{config, Session};
  17 use rustc::session::config::{Input, ErrorOutputType};
  18 use std::path::PathBuf;
  19 use std::process::Command;
  20 use syntax::ast;
  21
  22 use clippy_lints::utils::cargo;
  23
  24 struct ClippyCompilerCalls {
  25     default: RustcDefaultCalls,
  26     run_lints: bool,
  27 }
  28
  29 impl ClippyCompilerCalls {
  30     fn new(run_lints: bool) -> Self {
  31         ClippyCompilerCalls {
  32             default: RustcDefaultCalls,
  33             run_lints: run_lints,
  34         }
  35     }
  36 }
  37
  38 impl<'a> CompilerCalls<'a> for ClippyCompilerCalls {
  39     fn early_callback(&mut self,
  40                       matches: &getopts::Matches,
  41                       sopts: &config::Options,
  42                       cfg: &ast::CrateConfig,
  43                       descriptions: &rustc_errors::registry::Registry,
  44                       output: ErrorOutputType)
  45                       -> Compilation {
  46         self.default.early_callback(matches, sopts, cfg, descriptions, output)
  47     }
  48     fn no_input(&mut self,
  49                 matches: &getopts::Matches,
  50                 sopts: &config::Options,
  51                 cfg: &ast::CrateConfig,
  52                 odir: &Option<PathBuf>,
  53                 ofile: &Option<PathBuf>,
  54                 descriptions: &rustc_errors::registry::Registry)
  55                 -> Option<(Input, Option<PathBuf>)> {
  56         self.default.no_input(matches, sopts, cfg, odir, ofile, descriptions)
  57     }
  58     fn late_callback(&mut self,
  59                      matches: &getopts::Matches,
  60                      sess: &Session,
  61                      cfg: &ast::CrateConfig,
  62                      input: &Input,
  63                      odir: &Option<PathBuf>,
  64                      ofile: &Option<PathBuf>)
  65                      -> Compilation {
  66         self.default.late_callback(matches, sess, cfg, input, odir, ofile)
  67     }
  68     fn build_controller(&mut self, sess: &Session, matches: &getopts::Matches) -> driver::CompileController<'a> {
  69         let mut control = self.default.build_controller(sess, matches);
  70
  71         if self.run_lints {
  72             let old = std::mem::replace(&mut control.after_parse.callback, box |_| {});
  73             control.after_parse.callback = Box::new(move |state| {
  74                 {
  75                     let mut registry = rustc_plugin::registry::Registry::new(state.session, state.krate.as_ref().expect("at this compilation stage the krate must be parsed").span);
  76                     registry.args_hidden = Some(Vec::new());
  77                     clippy_lints::register_plugins(&mut registry);
  78
  79                     let rustc_plugin::registry::Registry { early_lint_passes,
  80                                                            late_lint_passes,
  81                                                            lint_groups,
  82                                                            llvm_passes,
  83                                                            attributes,
  84                                                            mir_passes,
  85                                                            .. } = registry;
  86                     let sess = &state.session;
  87                     let mut ls = sess.lint_store.borrow_mut();
  88                     for pass in early_lint_passes {
  89                         ls.register_early_pass(Some(sess), true, pass);
  90                     }
  91                     for pass in late_lint_passes {
  92                         ls.register_late_pass(Some(sess), true, pass);
  93                     }
  94
  95                     for (name, to) in lint_groups {
  96                         ls.register_group(Some(sess), true, name, to);
  97                     }
  98
  99                     sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
 100                     sess.mir_passes.borrow_mut().extend(mir_passes);
 101                     sess.plugin_attributes.borrow_mut().extend(attributes);
 102                 }
 103                 old(state);
 104             });
 105         }
 106
 107         control
 108     }
 109 }
 110
 111 use std::path::Path;
 112
 113 pub fn main() {
 114     use std::env;
 115
 116     if env::var("CLIPPY_DOGFOOD").map(|_| true).unwrap_or(false) {
 117         panic!("yummy");
 118     }
 119
 120     let dep_path = env::current_dir().expect("current dir is not readable").join("target").join("debug").join("deps");
 121
 122     let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
 123     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
 124     let sys_root = if let (Some(home), Some(toolchain)) = (home, toolchain) {
 125         format!("{}/toolchains/{}", home, toolchain)
 126     } else {
 127         option_env!("SYSROOT")
 128             .map(|s| s.to_owned())
 129             .or(Command::new("rustc")
 130                 .arg("--print")
 131                 .arg("sysroot")
 132                 .output()
 133                 .ok()
 134                 .and_then(|out| String::from_utf8(out.stdout).ok())
 135                 .map(|s| s.trim().to_owned()))
 136             .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust")
 137     };
 138
 139     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
 140         // this arm is executed on the initial call to `cargo clippy`
 141         let manifest_path_arg = std::env::args().skip(2).find(|val| val.starts_with("--manifest-path="));
 142
 143         let mut metadata = cargo::metadata(manifest_path_arg.as_ref().map(AsRef::as_ref)).expect("could not obtain cargo metadata");
 144         assert_eq!(metadata.version, 1);
 145
 146         let manifest_path = manifest_path_arg.map(|arg| PathBuf::from(Path::new(&arg["--manifest-path=".len()..])));
 147
 148         let current_dir = std::env::current_dir();
 149
 150         let package_index = metadata.packages.iter()
 151             .position(|package| {
 152                 let package_manifest_path = Path::new(&package.manifest_path);
 153                 if let Some(ref manifest_path) = manifest_path {
 154                     package_manifest_path == manifest_path
 155                 } else {
 156                     let current_dir = current_dir.as_ref().expect("could not read current directory");
 157                     let package_manifest_directory = package_manifest_path.parent().expect("could not find parent directory of package manifest");
 158                     package_manifest_directory == current_dir
 159                 }
 160             })
 161             .expect("could not find matching package");
 162         let package = metadata.packages.remove(package_index);
 163         for target in package.targets {
 164             let args = std::env::args().skip(2);
 165             if let Some(first) = target.kind.get(0) {
 166                 if target.kind.len() > 1 || first.ends_with("lib") {
 167                     if let Err(code) = process(std::iter::once("--lib".to_owned()).chain(args), &dep_path, &sys_root) {
 168                         std::process::exit(code);
 169                     }
 170                 } else if ["bin", "example", "test", "bench"].contains(&&**first) {
 171                     if let Err(code) = process(vec![format!("--{}", first), target.name].into_iter().chain(args), &dep_path, &sys_root) {
 172                         std::process::exit(code);
 173                     }
 174                 }
 175             } else {
 176                 panic!("badly formatted cargo metadata: target::kind is an empty array");
 177             }
 178         }
 179     } else {
 180         // this arm is executed when cargo-clippy runs `cargo rustc` with the `RUSTC` env var set to itself
 181
 182         // this conditional check for the --sysroot flag is there so users can call `cargo-clippy` directly
 183         // without having to pass --sysroot or anything
 184         let args: Vec<String> = if env::args().any(|s| s == "--sysroot") {
 185             env::args().collect()
 186         } else {
 187             env::args().chain(Some("--sysroot".to_owned())).chain(Some(sys_root)).collect()
 188         };
 189         // this check ensures that dependencies are built but not linted and the final crate is
 190         // linted but not built
 191         let mut ccc = ClippyCompilerCalls::new(env::args().any(|s| s == "-Zno-trans"));
 192         let (result, _) = rustc_driver::run_compiler(&args, &mut ccc, None, None);
 193
 194         if let Err(err_count) = result {
 195             if err_count > 0 {
 196                 std::process::exit(1);
 197             }
 198         }
 199     }
 200 }
 201
 202 fn process<P, I>(old_args: I, dep_path: P, sysroot: &str) -> Result<(), i32>
 203     where P: AsRef<Path>,
 204           I: Iterator<Item = String>
 205 {
 206
 207     let mut args = vec!["rustc".to_owned()];
 208
 209     let mut found_dashes = false;
 210     for arg in old_args {
 211         found_dashes |= arg == "--";
 212         args.push(arg);
 213     }
 214     if !found_dashes {
 215         args.push("--".to_owned());
 216     }
 217     args.push("-L".to_owned());
 218     args.push(dep_path.as_ref().to_string_lossy().into_owned());
 219     args.push(String::from("--sysroot"));
 220     args.push(sysroot.to_owned());
 221     args.push("-Zno-trans".to_owned());
 222
 223     let path = std::env::current_exe().expect("current executable path invalid");
 224     let exit_status = std::process::Command::new("cargo")
 225         .args(&args)
 226         .env("RUSTC", path)
 227         .spawn().expect("could not run cargo")
 228         .wait().expect("failed to wait for cargo?");
 229
 230     if exit_status.success() {
 231         Ok(())
 232     } else {
 233         Err(exit_status.code().unwrap_or(-1))
 234     }
 235 }