compiler/rustc_codegen_gcc/src/archive.rs

   1 use std::fs::File;
   2 use std::path::{Path, PathBuf};
   3
   4 use rustc_codegen_ssa::back::archive::ArchiveBuilder;
   5 use rustc_session::Session;
   6
   7 use rustc_data_structures::temp_dir::MaybeTempDir;
   8 use rustc_session::cstore::DllImport;
   9
  10 struct ArchiveConfig<'a> {
  11     sess: &'a Session,
  12     dst: PathBuf,
  13     use_native_ar: bool,
  14     use_gnu_style_archive: bool,
  15 }
  16
  17 #[derive(Debug)]
  18 enum ArchiveEntry {
  19     FromArchive {
  20         archive_index: usize,
  21         entry_index: usize,
  22     },
  23     File(PathBuf),
  24 }
  25
  26 pub struct ArArchiveBuilder<'a> {
  27     config: ArchiveConfig<'a>,
  28     src_archives: Vec<(PathBuf, ar::Archive<File>)>,
  29     // Don't use `HashMap` here, as the order is important. `rust.metadata.bin` must always be at
  30     // the end of an archive for linkers to not get confused.
  31     entries: Vec<(String, ArchiveEntry)>,
  32 }
  33
  34 impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
  35     fn new(sess: &'a Session, output: &Path) -> Self {
  36         let config = ArchiveConfig {
  37             sess,
  38             dst: output.to_path_buf(),
  39             use_native_ar: false,
  40             // FIXME test for linux and System V derivatives instead
  41             use_gnu_style_archive: sess.target.options.archive_format == "gnu",
  42         };
  43
  44         ArArchiveBuilder {
  45             config,
  46             src_archives: vec![],
  47             entries: vec![],
  48         }
  49     }
  50
  51     fn add_file(&mut self, file: &Path) {
  52         self.entries.push((
  53             file.file_name().unwrap().to_str().unwrap().to_string(),
  54             ArchiveEntry::File(file.to_owned()),
  55         ));
  56     }
  57
  58     fn add_archive<F>(&mut self, archive_path: &Path, mut skip: F) -> std::io::Result<()>
  59     where
  60         F: FnMut(&str) -> bool + 'static,
  61     {
  62         let mut archive = ar::Archive::new(std::fs::File::open(&archive_path)?);
  63         let archive_index = self.src_archives.len();
  64
  65         let mut i = 0;
  66         while let Some(entry) = archive.next_entry() {
  67             let entry = entry?;
  68             let file_name = String::from_utf8(entry.header().identifier().to_vec())
  69                 .map_err(|err| std::io::Error::new(std::io::ErrorKind::InvalidData, err))?;
  70             if !skip(&file_name) {
  71                 self.entries
  72                     .push((file_name, ArchiveEntry::FromArchive { archive_index, entry_index: i }));
  73             }
  74             i += 1;
  75         }
  76
  77         self.src_archives.push((archive_path.to_owned(), archive));
  78         Ok(())
  79     }
  80
  81     fn build(mut self) -> bool {
  82         use std::process::Command;
  83
  84         fn add_file_using_ar(archive: &Path, file: &Path) {
  85             Command::new("ar")
  86                 .arg("r") // add or replace file
  87                 .arg("-c") // silence created file message
  88                 .arg(archive)
  89                 .arg(&file)
  90                 .status()
  91                 .unwrap();
  92         }
  93
  94         enum BuilderKind<'a> {
  95             Bsd(ar::Builder<File>),
  96             Gnu(ar::GnuBuilder<File>),
  97             NativeAr(&'a Path),
  98         }
  99
 100         let mut builder = if self.config.use_native_ar {
 101             BuilderKind::NativeAr(&self.config.dst)
 102         } else if self.config.use_gnu_style_archive {
 103             BuilderKind::Gnu(ar::GnuBuilder::new(
 104                 File::create(&self.config.dst).unwrap(),
 105                 self.entries
 106                     .iter()
 107                     .map(|(name, _)| name.as_bytes().to_vec())
 108                     .collect(),
 109             ))
 110         } else {
 111             BuilderKind::Bsd(ar::Builder::new(File::create(&self.config.dst).unwrap()))
 112         };
 113
 114         let any_members = !self.entries.is_empty();
 115
 116         // Add all files
 117         for (entry_name, entry) in self.entries.into_iter() {
 118             match entry {
 119                 ArchiveEntry::FromArchive {
 120                     archive_index,
 121                     entry_index,
 122                 } => {
 123                     let (ref src_archive_path, ref mut src_archive) =
 124                         self.src_archives[archive_index];
 125                     let entry = src_archive.jump_to_entry(entry_index).unwrap();
 126                     let header = entry.header().clone();
 127
 128                     match builder {
 129                         BuilderKind::Bsd(ref mut builder) => {
 130                             builder.append(&header, entry).unwrap()
 131                         }
 132                         BuilderKind::Gnu(ref mut builder) => {
 133                             builder.append(&header, entry).unwrap()
 134                         }
 135                         BuilderKind::NativeAr(archive_file) => {
 136                             Command::new("ar")
 137                                 .arg("x")
 138                                 .arg(src_archive_path)
 139                                 .arg(&entry_name)
 140                                 .status()
 141                                 .unwrap();
 142                             add_file_using_ar(archive_file, Path::new(&entry_name));
 143                             std::fs::remove_file(entry_name).unwrap();
 144                         }
 145                     }
 146                 }
 147                 ArchiveEntry::File(file) =>
 148                     match builder {
 149                         BuilderKind::Bsd(ref mut builder) => {
 150                             builder
 151                                 .append_file(entry_name.as_bytes(), &mut File::open(file).expect("file for bsd builder"))
 152                                 .unwrap()
 153                         },
 154                         BuilderKind::Gnu(ref mut builder) => {
 155                             builder
 156                                 .append_file(entry_name.as_bytes(), &mut File::open(&file).expect(&format!("file {:?} for gnu builder", file)))
 157                                 .unwrap()
 158                         },
 159                         BuilderKind::NativeAr(archive_file) => add_file_using_ar(archive_file, &file),
 160                     },
 161             }
 162         }
 163
 164         // Finalize archive
 165         std::mem::drop(builder);
 166
 167         // Run ranlib to be able to link the archive
 168         let status = std::process::Command::new("ranlib")
 169             .arg(self.config.dst)
 170             .status()
 171             .expect("Couldn't run ranlib");
 172
 173         if !status.success() {
 174             self.config.sess.fatal(&format!("Ranlib exited with code {:?}", status.code()));
 175         }
 176
 177         any_members
 178     }
 179
 180     fn inject_dll_import_lib(&mut self, _lib_name: &str, _dll_imports: &[DllImport], _tmpdir: &MaybeTempDir) {
 181         unimplemented!();
 182     }
 183 }