323 lines
12 KiB
Rust
323 lines
12 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! A helper class for dealing with static archives
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use std::old_io::fs::PathExtensions;
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use std::old_io::process::{Command, ProcessOutput};
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use std::old_io::{fs, TempDir};
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use std::old_io;
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use std::os;
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use std::str;
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use syntax::diagnostic::Handler as ErrorHandler;
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pub static METADATA_FILENAME: &'static str = "rust.metadata.bin";
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pub struct ArchiveConfig<'a> {
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pub handler: &'a ErrorHandler,
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pub dst: Path,
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pub lib_search_paths: Vec<Path>,
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pub slib_prefix: String,
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pub slib_suffix: String,
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pub maybe_ar_prog: Option<String>
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}
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pub struct Archive<'a> {
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handler: &'a ErrorHandler,
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dst: Path,
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lib_search_paths: Vec<Path>,
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slib_prefix: String,
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slib_suffix: String,
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maybe_ar_prog: Option<String>
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}
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/// Helper for adding many files to an archive with a single invocation of
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/// `ar`.
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#[must_use = "must call build() to finish building the archive"]
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pub struct ArchiveBuilder<'a> {
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archive: Archive<'a>,
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work_dir: TempDir,
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/// Filename of each member that should be added to the archive.
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members: Vec<Path>,
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should_update_symbols: bool,
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}
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fn run_ar(handler: &ErrorHandler, maybe_ar_prog: &Option<String>,
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args: &str, cwd: Option<&Path>,
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paths: &[&Path]) -> ProcessOutput {
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let ar = match *maybe_ar_prog {
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Some(ref ar) => &ar[],
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None => "ar"
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};
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let mut cmd = Command::new(ar);
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cmd.arg(args).args(paths);
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debug!("{:?}", cmd);
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match cwd {
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Some(p) => {
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cmd.cwd(p);
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debug!("inside {:?}", p.display());
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}
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None => {}
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}
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match cmd.spawn() {
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Ok(prog) => {
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let o = prog.wait_with_output().unwrap();
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if !o.status.success() {
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handler.err(&format!("{:?} failed with: {}", cmd, o.status)[]);
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handler.note(&format!("stdout ---\n{}",
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str::from_utf8(&o.output[]).unwrap())[]);
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handler.note(&format!("stderr ---\n{}",
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str::from_utf8(&o.error[]).unwrap())
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[]);
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handler.abort_if_errors();
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}
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o
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},
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Err(e) => {
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handler.err(&format!("could not exec `{}`: {}", &ar[],
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e)[]);
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handler.abort_if_errors();
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panic!("rustc::back::archive::run_ar() should not reach this point");
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}
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}
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}
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pub fn find_library(name: &str, osprefix: &str, ossuffix: &str,
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search_paths: &[Path], handler: &ErrorHandler) -> Path {
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// On Windows, static libraries sometimes show up as libfoo.a and other
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// times show up as foo.lib
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let oslibname = format!("{}{}{}", osprefix, name, ossuffix);
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let unixlibname = format!("lib{}.a", name);
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for path in search_paths.iter() {
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debug!("looking for {} inside {:?}", name, path.display());
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let test = path.join(&oslibname[]);
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if test.exists() { return test }
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if oslibname != unixlibname {
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let test = path.join(&unixlibname[]);
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if test.exists() { return test }
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}
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}
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handler.fatal(&format!("could not find native static library `{}`, \
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perhaps an -L flag is missing?",
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name)[]);
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}
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impl<'a> Archive<'a> {
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fn new(config: ArchiveConfig<'a>) -> Archive<'a> {
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let ArchiveConfig { handler, dst, lib_search_paths, slib_prefix, slib_suffix,
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maybe_ar_prog } = config;
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Archive {
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handler: handler,
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dst: dst,
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lib_search_paths: lib_search_paths,
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slib_prefix: slib_prefix,
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slib_suffix: slib_suffix,
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maybe_ar_prog: maybe_ar_prog
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}
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}
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/// Opens an existing static archive
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pub fn open(config: ArchiveConfig<'a>) -> Archive<'a> {
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let archive = Archive::new(config);
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assert!(archive.dst.exists());
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archive
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}
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/// Removes a file from this archive
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pub fn remove_file(&mut self, file: &str) {
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run_ar(self.handler, &self.maybe_ar_prog, "d", None, &[&self.dst, &Path::new(file)]);
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}
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/// Lists all files in an archive
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pub fn files(&self) -> Vec<String> {
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let output = run_ar(self.handler, &self.maybe_ar_prog, "t", None, &[&self.dst]);
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let output = str::from_utf8(&output.output[]).unwrap();
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// use lines_any because windows delimits output with `\r\n` instead of
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// just `\n`
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output.lines_any().map(|s| s.to_string()).collect()
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}
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/// Creates an `ArchiveBuilder` for adding files to this archive.
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pub fn extend(self) -> ArchiveBuilder<'a> {
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ArchiveBuilder::new(self)
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}
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}
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impl<'a> ArchiveBuilder<'a> {
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fn new(archive: Archive<'a>) -> ArchiveBuilder<'a> {
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ArchiveBuilder {
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archive: archive,
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work_dir: TempDir::new("rsar").unwrap(),
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members: vec![],
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should_update_symbols: false,
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}
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}
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/// Create a new static archive, ready for adding files.
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pub fn create(config: ArchiveConfig<'a>) -> ArchiveBuilder<'a> {
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let archive = Archive::new(config);
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ArchiveBuilder::new(archive)
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}
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/// Adds all of the contents of a native library to this archive. This will
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/// search in the relevant locations for a library named `name`.
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pub fn add_native_library(&mut self, name: &str) -> old_io::IoResult<()> {
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let location = find_library(name,
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&self.archive.slib_prefix[],
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&self.archive.slib_suffix[],
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&self.archive.lib_search_paths[],
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self.archive.handler);
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self.add_archive(&location, name, |_| false)
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}
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/// Adds all of the contents of the rlib at the specified path to this
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/// archive.
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///
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/// This ignores adding the bytecode from the rlib, and if LTO is enabled
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/// then the object file also isn't added.
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pub fn add_rlib(&mut self, rlib: &Path, name: &str,
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lto: bool) -> old_io::IoResult<()> {
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// Ignoring obj file starting with the crate name
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// as simple comparison is not enough - there
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// might be also an extra name suffix
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let obj_start = format!("{}", name);
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let obj_start = &obj_start[];
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// Ignoring all bytecode files, no matter of
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// name
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let bc_ext = ".bytecode.deflate";
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self.add_archive(rlib, &name[], |fname: &str| {
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let skip_obj = lto && fname.starts_with(obj_start)
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&& fname.ends_with(".o");
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skip_obj || fname.ends_with(bc_ext) || fname == METADATA_FILENAME
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})
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}
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/// Adds an arbitrary file to this archive
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pub fn add_file(&mut self, file: &Path) -> old_io::IoResult<()> {
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let filename = Path::new(file.filename().unwrap());
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let new_file = self.work_dir.path().join(&filename);
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try!(fs::copy(file, &new_file));
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self.members.push(filename);
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Ok(())
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}
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/// Indicate that the next call to `build` should updates all symbols in
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/// the archive (run 'ar s' over it).
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pub fn update_symbols(&mut self) {
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self.should_update_symbols = true;
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}
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/// Combine the provided files, rlibs, and native libraries into a single
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/// `Archive`.
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pub fn build(self) -> Archive<'a> {
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// Get an absolute path to the destination, so `ar` will work even
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// though we run it from `self.work_dir`.
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let abs_dst = os::getcwd().unwrap().join(&self.archive.dst);
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assert!(!abs_dst.is_relative());
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let mut args = vec![&abs_dst];
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let mut total_len = abs_dst.as_vec().len();
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if self.members.is_empty() {
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// OSX `ar` does not allow using `r` with no members, but it does
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// allow running `ar s file.a` to update symbols only.
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if self.should_update_symbols {
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run_ar(self.archive.handler, &self.archive.maybe_ar_prog,
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"s", Some(self.work_dir.path()), &args[]);
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}
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return self.archive;
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}
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// Don't allow the total size of `args` to grow beyond 32,000 bytes.
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// Windows will raise an error if the argument string is longer than
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// 32,768, and we leave a bit of extra space for the program name.
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static ARG_LENGTH_LIMIT: uint = 32000;
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for member_name in self.members.iter() {
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let len = member_name.as_vec().len();
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// `len + 1` to account for the space that's inserted before each
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// argument. (Windows passes command-line arguments as a single
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// string, not an array of strings.)
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if total_len + len + 1 > ARG_LENGTH_LIMIT {
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// Add the archive members seen so far, without updating the
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// symbol table (`S`).
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run_ar(self.archive.handler, &self.archive.maybe_ar_prog,
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"cruS", Some(self.work_dir.path()), &args[]);
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args.clear();
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args.push(&abs_dst);
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total_len = abs_dst.as_vec().len();
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}
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args.push(member_name);
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total_len += len + 1;
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}
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// Add the remaining archive members, and update the symbol table if
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// necessary.
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let flags = if self.should_update_symbols { "crus" } else { "cruS" };
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run_ar(self.archive.handler, &self.archive.maybe_ar_prog,
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flags, Some(self.work_dir.path()), &args[]);
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self.archive
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}
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fn add_archive<F>(&mut self, archive: &Path, name: &str,
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mut skip: F) -> old_io::IoResult<()>
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where F: FnMut(&str) -> bool,
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{
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let loc = TempDir::new("rsar").unwrap();
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// First, extract the contents of the archive to a temporary directory.
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// We don't unpack directly into `self.work_dir` due to the possibility
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// of filename collisions.
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let archive = os::make_absolute(archive).unwrap();
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run_ar(self.archive.handler, &self.archive.maybe_ar_prog,
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"x", Some(loc.path()), &[&archive]);
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// Next, we must rename all of the inputs to "guaranteed unique names".
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// We move each file into `self.work_dir` under its new unique name.
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// The reason for this renaming is that archives are keyed off the name
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// of the files, so if two files have the same name they will override
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// one another in the archive (bad).
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//
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// We skip any files explicitly desired for skipping, and we also skip
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// all SYMDEF files as these are just magical placeholders which get
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// re-created when we make a new archive anyway.
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let files = try!(fs::readdir(loc.path()));
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for file in files.iter() {
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let filename = file.filename_str().unwrap();
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if skip(filename) { continue }
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if filename.contains(".SYMDEF") { continue }
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let filename = format!("r-{}-{}", name, filename);
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// LLDB (as mentioned in back::link) crashes on filenames of exactly
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// 16 bytes in length. If we're including an object file with
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// exactly 16-bytes of characters, give it some prefix so that it's
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// not 16 bytes.
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let filename = if filename.len() == 16 {
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format!("lldb-fix-{}", filename)
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} else {
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filename
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};
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let new_filename = self.work_dir.path().join(&filename[]);
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try!(fs::rename(file, &new_filename));
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self.members.push(Path::new(filename));
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}
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Ok(())
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}
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}
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