Add 'compiler/rustc_codegen_gcc/' from commit 'afae271d5d'

git-subtree-dir: compiler/rustc_codegen_gcc
git-subtree-mainline: ae90dcf020
git-subtree-split: afae271d5d

compiler/rustc_codegen_gcc/src/archive.rs

@@ -0,0 +1,270 @@
+use std::fs::File;
+use std::path::{Path, PathBuf};
+
+use rustc_session::Session;
+use rustc_codegen_ssa::back::archive::{find_library, ArchiveBuilder};
+use rustc_codegen_ssa::METADATA_FILENAME;
+use rustc_data_structures::temp_dir::MaybeTempDir;
+use rustc_middle::middle::cstore::DllImport;
+use rustc_span::symbol::Symbol;
+
+struct ArchiveConfig<'a> {
+    sess: &'a Session,
+    dst: PathBuf,
+    lib_search_paths: Vec<PathBuf>,
+    use_native_ar: bool,
+    use_gnu_style_archive: bool,
+}
+
+#[derive(Debug)]
+enum ArchiveEntry {
+    FromArchive {
+        archive_index: usize,
+        entry_index: usize,
+    },
+    File(PathBuf),
+}
+
+pub struct ArArchiveBuilder<'a> {
+    config: ArchiveConfig<'a>,
+    src_archives: Vec<(PathBuf, ar::Archive<File>)>,
+    // Don't use `HashMap` here, as the order is important. `rust.metadata.bin` must always be at
+    // the end of an archive for linkers to not get confused.
+    entries: Vec<(String, ArchiveEntry)>,
+}
+
+impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
+    fn new(sess: &'a Session, output: &Path, input: Option<&Path>) -> Self {
+        use rustc_codegen_ssa::back::link::archive_search_paths;
+        let config = ArchiveConfig {
+            sess,
+            dst: output.to_path_buf(),
+            lib_search_paths: archive_search_paths(sess),
+            use_native_ar: false,
+            // FIXME test for linux and System V derivatives instead
+            use_gnu_style_archive: sess.target.options.archive_format == "gnu",
+        };
+
+        let (src_archives, entries) = if let Some(input) = input {
+            let mut archive = ar::Archive::new(File::open(input).unwrap());
+            let mut entries = Vec::new();
+
+            let mut i = 0;
+            while let Some(entry) = archive.next_entry() {
+                let entry = entry.unwrap();
+                entries.push((
+                    String::from_utf8(entry.header().identifier().to_vec()).unwrap(),
+                    ArchiveEntry::FromArchive {
+                        archive_index: 0,
+                        entry_index: i,
+                    },
+                ));
+                i += 1;
+            }
+
+            (vec![(input.to_owned(), archive)], entries)
+        } else {
+            (vec![], Vec::new())
+        };
+
+        ArArchiveBuilder {
+            config,
+            src_archives,
+            entries,
+        }
+    }
+
+    fn src_files(&mut self) -> Vec<String> {
+        self.entries.iter().map(|(name, _)| name.clone()).collect()
+    }
+
+    fn remove_file(&mut self, name: &str) {
+        let index = self
+            .entries
+            .iter()
+            .position(|(entry_name, _)| entry_name == name)
+            .expect("Tried to remove file not existing in src archive");
+        self.entries.remove(index);
+    }
+
+    fn add_file(&mut self, file: &Path) {
+        self.entries.push((
+            file.file_name().unwrap().to_str().unwrap().to_string(),
+            ArchiveEntry::File(file.to_owned()),
+        ));
+    }
+
+    fn add_native_library(&mut self, name: Symbol, verbatim: bool) {
+        let location = find_library(name, verbatim, &self.config.lib_search_paths, self.config.sess);
+        self.add_archive(location.clone(), |_| false)
+            .unwrap_or_else(|e| {
+                panic!(
+                    "failed to add native library {}: {}",
+                    location.to_string_lossy(),
+                    e
+                );
+            });
+    }
+
+    fn add_rlib(
+        &mut self,
+        rlib: &Path,
+        name: &str,
+        lto: bool,
+        skip_objects: bool,
+    ) -> std::io::Result<()> {
+        let obj_start = name.to_owned();
+
+        self.add_archive(rlib.to_owned(), move |fname: &str| {
+            // Ignore metadata files, no matter the name.
+            if fname == METADATA_FILENAME {
+                return true;
+            }
+
+            // Don't include Rust objects if LTO is enabled
+            if lto && fname.starts_with(&obj_start) && fname.ends_with(".o") {
+                return true;
+            }
+
+            // Otherwise if this is *not* a rust object and we're skipping
+            // objects then skip this file
+            if skip_objects && (!fname.starts_with(&obj_start) || !fname.ends_with(".o")) {
+                return true;
+            }
+
+            // ok, don't skip this
+            return false;
+        })
+    }
+
+    fn update_symbols(&mut self) {
+    }
+
+    fn build(mut self) {
+        use std::process::Command;
+
+        fn add_file_using_ar(archive: &Path, file: &Path) {
+            Command::new("ar")
+                .arg("r") // add or replace file
+                .arg("-c") // silence created file message
+                .arg(archive)
+                .arg(&file)
+                .status()
+                .unwrap();
+        }
+
+        enum BuilderKind<'a> {
+            Bsd(ar::Builder<File>),
+            Gnu(ar::GnuBuilder<File>),
+            NativeAr(&'a Path),
+        }
+
+        let mut builder = if self.config.use_native_ar {
+            BuilderKind::NativeAr(&self.config.dst)
+        } else if self.config.use_gnu_style_archive {
+            BuilderKind::Gnu(ar::GnuBuilder::new(
+                File::create(&self.config.dst).unwrap(),
+                self.entries
+                    .iter()
+                    .map(|(name, _)| name.as_bytes().to_vec())
+                    .collect(),
+            ))
+        } else {
+            BuilderKind::Bsd(ar::Builder::new(File::create(&self.config.dst).unwrap()))
+        };
+
+        // Add all files
+        for (entry_name, entry) in self.entries.into_iter() {
+            match entry {
+                ArchiveEntry::FromArchive {
+                    archive_index,
+                    entry_index,
+                } => {
+                    let (ref src_archive_path, ref mut src_archive) =
+                        self.src_archives[archive_index];
+                    let entry = src_archive.jump_to_entry(entry_index).unwrap();
+                    let header = entry.header().clone();
+
+                    match builder {
+                        BuilderKind::Bsd(ref mut builder) => {
+                            builder.append(&header, entry).unwrap()
+                        }
+                        BuilderKind::Gnu(ref mut builder) => {
+                            builder.append(&header, entry).unwrap()
+                        }
+                        BuilderKind::NativeAr(archive_file) => {
+                            Command::new("ar")
+                                .arg("x")
+                                .arg(src_archive_path)
+                                .arg(&entry_name)
+                                .status()
+                                .unwrap();
+                            add_file_using_ar(archive_file, Path::new(&entry_name));
+                            std::fs::remove_file(entry_name).unwrap();
+                        }
+                    }
+                }
+                ArchiveEntry::File(file) =>
+                    match builder {
+                        BuilderKind::Bsd(ref mut builder) => {
+                            builder
+                                .append_file(entry_name.as_bytes(), &mut File::open(file).expect("file for bsd builder"))
+                                .unwrap()
+                        },
+                        BuilderKind::Gnu(ref mut builder) => {
+                            builder
+                                .append_file(entry_name.as_bytes(), &mut File::open(&file).expect(&format!("file {:?} for gnu builder", file)))
+                                .unwrap()
+                        },
+                        BuilderKind::NativeAr(archive_file) => add_file_using_ar(archive_file, &file),
+                    },
+            }
+        }
+
+        // Finalize archive
+        std::mem::drop(builder);
+
+        // Run ranlib to be able to link the archive
+        let status = std::process::Command::new("ranlib")
+            .arg(self.config.dst)
+            .status()
+            .expect("Couldn't run ranlib");
+
+        if !status.success() {
+            self.config.sess.fatal(&format!("Ranlib exited with code {:?}", status.code()));
+        }
+    }
+
+    fn inject_dll_import_lib(&mut self, _lib_name: &str, _dll_imports: &[DllImport], _tmpdir: &MaybeTempDir) {
+        unimplemented!();
+    }
+}
+
+impl<'a> ArArchiveBuilder<'a> {
+    fn add_archive<F>(&mut self, archive_path: PathBuf, mut skip: F) -> std::io::Result<()>
+    where
+        F: FnMut(&str) -> bool + 'static,
+    {
+        let mut archive = ar::Archive::new(std::fs::File::open(&archive_path)?);
+        let archive_index = self.src_archives.len();
+
+        let mut i = 0;
+        while let Some(entry) = archive.next_entry() {
+            let entry = entry.unwrap();
+            let file_name = String::from_utf8(entry.header().identifier().to_vec()).unwrap();
+            if !skip(&file_name) {
+                self.entries.push((
+                    file_name,
+                    ArchiveEntry::FromArchive {
+                        archive_index,
+                        entry_index: i,
+                    },
+                ));
+            }
+            i += 1;
+        }
+
+        self.src_archives.push((archive_path, archive));
+        Ok(())
+    }
+}