925 lines
36 KiB
Rust
925 lines
36 KiB
Rust
// Copyright 2012-2015 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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#![allow(non_camel_case_types)]
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//! Validates all used crates and extern libraries and loads their metadata
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use back::svh::Svh;
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use session::{config, Session};
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use session::search_paths::PathKind;
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use metadata::cstore;
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use metadata::cstore::{CStore, CrateSource, MetadataBlob};
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use metadata::decoder;
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use metadata::loader;
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use metadata::loader::CratePaths;
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use util::nodemap::FnvHashMap;
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use front::map as hir_map;
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use std::cell::{RefCell, Cell};
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::fs;
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use syntax::ast;
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use syntax::abi;
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use syntax::codemap::{self, Span, mk_sp, Pos};
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use syntax::parse;
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use syntax::attr;
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use syntax::parse::token::InternedString;
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use syntax::util::small_vector::SmallVector;
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use rustc_front::visit;
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use rustc_front::hir;
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use rustc_front::attr as attr_front;
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use rustc_front::attr::AttrMetaMethods;
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use rustc_front::lowering::unlower_attribute;
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use log;
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pub struct LocalCrateReader<'a, 'b:'a> {
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sess: &'a Session,
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creader: CrateReader<'a>,
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ast_map: &'a hir_map::Map<'b>,
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}
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pub struct CrateReader<'a> {
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sess: &'a Session,
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next_crate_num: ast::CrateNum,
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foreign_item_map: FnvHashMap<String, Vec<ast::NodeId>>,
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}
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impl<'a, 'b, 'v> visit::Visitor<'v> for LocalCrateReader<'a, 'b> {
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fn visit_item(&mut self, a: &hir::Item) {
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self.process_item(a);
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visit::walk_item(self, a);
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}
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}
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fn dump_crates(cstore: &CStore) {
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info!("resolved crates:");
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cstore.iter_crate_data_origins(|_, data, opt_source| {
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info!(" name: {}", data.name());
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info!(" cnum: {}", data.cnum);
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info!(" hash: {}", data.hash());
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info!(" reqd: {}", data.explicitly_linked.get());
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opt_source.map(|cs| {
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let CrateSource { dylib, rlib, cnum: _ } = cs;
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dylib.map(|dl| info!(" dylib: {}", dl.0.display()));
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rlib.map(|rl| info!(" rlib: {}", rl.0.display()));
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});
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})
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}
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fn should_link(i: &ast::Item) -> bool {
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!attr::contains_name(&i.attrs, "no_link")
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}
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// Dup for the hir
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fn should_link_hir(i: &hir::Item) -> bool {
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!attr_front::contains_name(&i.attrs, "no_link")
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}
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struct CrateInfo {
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ident: String,
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name: String,
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id: ast::NodeId,
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should_link: bool,
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}
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pub fn validate_crate_name(sess: Option<&Session>, s: &str, sp: Option<Span>) {
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let say = |s: &str| {
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match (sp, sess) {
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(_, None) => panic!("{}", s),
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(Some(sp), Some(sess)) => sess.span_err(sp, s),
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(None, Some(sess)) => sess.err(s),
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}
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};
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if s.is_empty() {
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say("crate name must not be empty");
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}
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for c in s.chars() {
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if c.is_alphanumeric() { continue }
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if c == '_' { continue }
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say(&format!("invalid character `{}` in crate name: `{}`", c, s));
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}
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match sess {
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Some(sess) => sess.abort_if_errors(),
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None => {}
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}
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}
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fn register_native_lib(sess: &Session,
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span: Option<Span>,
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name: String,
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kind: cstore::NativeLibraryKind) {
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if name.is_empty() {
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match span {
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Some(span) => {
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sess.span_err(span, "#[link(name = \"\")] given with \
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empty name");
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}
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None => {
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sess.err("empty library name given via `-l`");
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}
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}
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return
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}
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let is_osx = sess.target.target.options.is_like_osx;
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if kind == cstore::NativeFramework && !is_osx {
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let msg = "native frameworks are only available on OSX targets";
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match span {
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Some(span) => sess.span_err(span, msg),
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None => sess.err(msg),
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}
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}
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sess.cstore.add_used_library(name, kind);
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}
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// Extra info about a crate loaded for plugins or exported macros.
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struct ExtensionCrate {
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metadata: PMDSource,
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dylib: Option<PathBuf>,
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target_only: bool,
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}
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enum PMDSource {
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Registered(Rc<cstore::crate_metadata>),
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Owned(MetadataBlob),
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}
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impl PMDSource {
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pub fn as_slice<'a>(&'a self) -> &'a [u8] {
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match *self {
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PMDSource::Registered(ref cmd) => cmd.data(),
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PMDSource::Owned(ref mdb) => mdb.as_slice(),
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}
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}
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}
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impl<'a> CrateReader<'a> {
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pub fn new(sess: &'a Session) -> CrateReader<'a> {
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CrateReader {
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sess: sess,
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next_crate_num: sess.cstore.next_crate_num(),
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foreign_item_map: FnvHashMap(),
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}
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}
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fn extract_crate_info(&self, i: &ast::Item) -> Option<CrateInfo> {
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match i.node {
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ast::ItemExternCrate(ref path_opt) => {
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debug!("resolving extern crate stmt. ident: {} path_opt: {:?}",
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i.ident, path_opt);
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let name = match *path_opt {
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Some(name) => {
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validate_crate_name(Some(self.sess), &name.as_str(),
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Some(i.span));
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name.to_string()
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}
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None => i.ident.to_string(),
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};
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Some(CrateInfo {
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ident: i.ident.to_string(),
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name: name,
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id: i.id,
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should_link: should_link(i),
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})
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}
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_ => None
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}
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}
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// Dup of the above, but for the hir
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fn extract_crate_info_hir(&self, i: &hir::Item) -> Option<CrateInfo> {
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match i.node {
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hir::ItemExternCrate(ref path_opt) => {
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debug!("resolving extern crate stmt. ident: {} path_opt: {:?}",
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i.ident, path_opt);
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let name = match *path_opt {
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Some(name) => {
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validate_crate_name(Some(self.sess), &name.as_str(),
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Some(i.span));
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name.to_string()
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}
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None => i.ident.to_string(),
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};
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Some(CrateInfo {
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ident: i.ident.to_string(),
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name: name,
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id: i.id,
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should_link: should_link_hir(i),
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})
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}
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_ => None
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}
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}
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fn existing_match(&self, name: &str, hash: Option<&Svh>, kind: PathKind)
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-> Option<ast::CrateNum> {
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let mut ret = None;
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self.sess.cstore.iter_crate_data(|cnum, data| {
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if data.name != name { return }
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match hash {
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Some(hash) if *hash == data.hash() => { ret = Some(cnum); return }
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Some(..) => return,
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None => {}
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}
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// When the hash is None we're dealing with a top-level dependency
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// in which case we may have a specification on the command line for
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// this library. Even though an upstream library may have loaded
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// something of the same name, we have to make sure it was loaded
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// from the exact same location as well.
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//
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// We're also sure to compare *paths*, not actual byte slices. The
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// `source` stores paths which are normalized which may be different
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// from the strings on the command line.
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let source = self.sess.cstore.get_used_crate_source(cnum).unwrap();
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if let Some(locs) = self.sess.opts.externs.get(name) {
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let found = locs.iter().any(|l| {
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let l = fs::canonicalize(l).ok();
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source.dylib.as_ref().map(|p| &p.0) == l.as_ref() ||
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source.rlib.as_ref().map(|p| &p.0) == l.as_ref()
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});
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if found {
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ret = Some(cnum);
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}
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return
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}
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// Alright, so we've gotten this far which means that `data` has the
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// right name, we don't have a hash, and we don't have a --extern
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// pointing for ourselves. We're still not quite yet done because we
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// have to make sure that this crate was found in the crate lookup
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// path (this is a top-level dependency) as we don't want to
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// implicitly load anything inside the dependency lookup path.
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let prev_kind = source.dylib.as_ref().or(source.rlib.as_ref())
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.unwrap().1;
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if ret.is_none() && (prev_kind == kind || prev_kind == PathKind::All) {
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ret = Some(cnum);
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}
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});
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return ret;
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}
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fn register_crate(&mut self,
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root: &Option<CratePaths>,
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ident: &str,
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name: &str,
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span: Span,
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lib: loader::Library,
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explicitly_linked: bool)
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-> (ast::CrateNum, Rc<cstore::crate_metadata>,
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cstore::CrateSource) {
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// Claim this crate number and cache it
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let cnum = self.next_crate_num;
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self.next_crate_num += 1;
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// Stash paths for top-most crate locally if necessary.
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let crate_paths = if root.is_none() {
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Some(CratePaths {
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ident: ident.to_string(),
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dylib: lib.dylib.clone().map(|p| p.0),
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rlib: lib.rlib.clone().map(|p| p.0),
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})
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} else {
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None
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};
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// Maintain a reference to the top most crate.
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let root = if root.is_some() { root } else { &crate_paths };
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let loader::Library { dylib, rlib, metadata } = lib;
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let cnum_map = self.resolve_crate_deps(root, metadata.as_slice(), span);
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let staged_api = self.is_staged_api(metadata.as_slice());
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let cmeta = Rc::new(cstore::crate_metadata {
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name: name.to_string(),
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local_path: RefCell::new(SmallVector::zero()),
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index: decoder::load_index(metadata.as_slice()),
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data: metadata,
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cnum_map: RefCell::new(cnum_map),
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cnum: cnum,
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codemap_import_info: RefCell::new(vec![]),
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span: span,
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staged_api: staged_api,
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explicitly_linked: Cell::new(explicitly_linked),
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});
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let source = cstore::CrateSource {
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dylib: dylib,
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rlib: rlib,
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cnum: cnum,
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};
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self.sess.cstore.set_crate_data(cnum, cmeta.clone());
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self.sess.cstore.add_used_crate_source(source.clone());
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(cnum, cmeta, source)
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}
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fn is_staged_api(&self, data: &[u8]) -> bool {
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let attrs = decoder::get_crate_attributes(data);
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for attr in &attrs {
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if &attr.name()[..] == "staged_api" {
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match attr.node.value.node { hir::MetaWord(_) => return true, _ => (/*pass*/) }
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}
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}
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return false;
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}
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fn resolve_crate(&mut self,
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root: &Option<CratePaths>,
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ident: &str,
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name: &str,
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hash: Option<&Svh>,
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span: Span,
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kind: PathKind,
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explicitly_linked: bool)
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-> (ast::CrateNum, Rc<cstore::crate_metadata>,
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cstore::CrateSource) {
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match self.existing_match(name, hash, kind) {
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None => {
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let mut load_ctxt = loader::Context {
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sess: self.sess,
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span: span,
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ident: ident,
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crate_name: name,
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hash: hash.map(|a| &*a),
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filesearch: self.sess.target_filesearch(kind),
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target: &self.sess.target.target,
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triple: &self.sess.opts.target_triple,
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root: root,
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rejected_via_hash: vec!(),
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rejected_via_triple: vec!(),
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rejected_via_kind: vec!(),
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should_match_name: true,
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};
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let library = load_ctxt.load_library_crate();
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self.register_crate(root, ident, name, span, library,
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explicitly_linked)
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}
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Some(cnum) => {
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let data = self.sess.cstore.get_crate_data(cnum);
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if explicitly_linked && !data.explicitly_linked.get() {
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data.explicitly_linked.set(explicitly_linked);
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}
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(cnum, data, self.sess.cstore.get_used_crate_source(cnum).unwrap())
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}
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}
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}
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// Go through the crate metadata and load any crates that it references
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fn resolve_crate_deps(&mut self,
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root: &Option<CratePaths>,
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cdata: &[u8], span : Span)
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-> cstore::cnum_map {
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debug!("resolving deps of external crate");
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// The map from crate numbers in the crate we're resolving to local crate
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// numbers
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decoder::get_crate_deps(cdata).iter().map(|dep| {
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debug!("resolving dep crate {} hash: `{}`", dep.name, dep.hash);
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let (local_cnum, _, _) = self.resolve_crate(root,
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&dep.name,
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&dep.name,
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Some(&dep.hash),
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span,
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PathKind::Dependency,
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dep.explicitly_linked);
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(dep.cnum, local_cnum)
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}).collect()
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}
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fn read_extension_crate(&mut self, span: Span, info: &CrateInfo) -> ExtensionCrate {
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let target_triple = &self.sess.opts.target_triple[..];
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let is_cross = target_triple != config::host_triple();
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let mut should_link = info.should_link && !is_cross;
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let mut target_only = false;
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let ident = info.ident.clone();
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let name = info.name.clone();
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let mut load_ctxt = loader::Context {
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sess: self.sess,
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span: span,
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ident: &ident[..],
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crate_name: &name[..],
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hash: None,
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filesearch: self.sess.host_filesearch(PathKind::Crate),
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target: &self.sess.host,
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triple: config::host_triple(),
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root: &None,
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rejected_via_hash: vec!(),
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rejected_via_triple: vec!(),
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rejected_via_kind: vec!(),
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should_match_name: true,
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};
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let library = match load_ctxt.maybe_load_library_crate() {
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Some(l) => l,
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None if is_cross => {
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// Try loading from target crates. This will abort later if we
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// try to load a plugin registrar function,
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target_only = true;
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should_link = info.should_link;
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load_ctxt.target = &self.sess.target.target;
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load_ctxt.triple = target_triple;
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load_ctxt.filesearch = self.sess.target_filesearch(PathKind::Crate);
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load_ctxt.load_library_crate()
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}
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None => { load_ctxt.report_load_errs(); unreachable!() },
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};
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let dylib = library.dylib.clone();
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let register = should_link && self.existing_match(&info.name,
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None,
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PathKind::Crate).is_none();
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let metadata = if register {
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// Register crate now to avoid double-reading metadata
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let (_, cmd, _) = self.register_crate(&None, &info.ident,
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&info.name, span, library,
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true);
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PMDSource::Registered(cmd)
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} else {
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// Not registering the crate; just hold on to the metadata
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PMDSource::Owned(library.metadata)
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};
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ExtensionCrate {
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metadata: metadata,
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dylib: dylib.map(|p| p.0),
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target_only: target_only,
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}
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}
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/// Read exported macros.
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pub fn read_exported_macros(&mut self, item: &ast::Item) -> Vec<ast::MacroDef> {
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let ci = self.extract_crate_info(item).unwrap();
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let ekrate = self.read_extension_crate(item.span, &ci);
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let source_name = format!("<{} macros>", item.ident);
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let mut macros = vec![];
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decoder::each_exported_macro(ekrate.metadata.as_slice(),
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&*self.sess.cstore.intr,
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|name, attrs, body| {
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// NB: Don't use parse::parse_tts_from_source_str because it parses with
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// quote_depth > 0.
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let mut p = parse::new_parser_from_source_str(&self.sess.parse_sess,
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self.sess.opts.cfg.clone(),
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source_name.clone(),
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body);
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let lo = p.span.lo;
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let body = match p.parse_all_token_trees() {
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Ok(body) => body,
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Err(err) => panic!(err),
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};
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let span = mk_sp(lo, p.last_span.hi);
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p.abort_if_errors();
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macros.push(ast::MacroDef {
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ident: name.ident(),
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attrs: attrs.iter().map(|a| unlower_attribute(a)).collect(),
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id: ast::DUMMY_NODE_ID,
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span: span,
|
|
imported_from: Some(item.ident),
|
|
// overridden in plugin/load.rs
|
|
export: false,
|
|
use_locally: false,
|
|
allow_internal_unstable: false,
|
|
|
|
body: body,
|
|
});
|
|
true
|
|
}
|
|
);
|
|
macros
|
|
}
|
|
|
|
/// Look for a plugin registrar. Returns library path and symbol name.
|
|
pub fn find_plugin_registrar(&mut self, span: Span, name: &str)
|
|
-> Option<(PathBuf, String)> {
|
|
let ekrate = self.read_extension_crate(span, &CrateInfo {
|
|
name: name.to_string(),
|
|
ident: name.to_string(),
|
|
id: ast::DUMMY_NODE_ID,
|
|
should_link: false,
|
|
});
|
|
|
|
if ekrate.target_only {
|
|
// Need to abort before syntax expansion.
|
|
let message = format!("plugin `{}` is not available for triple `{}` \
|
|
(only found {})",
|
|
name,
|
|
config::host_triple(),
|
|
self.sess.opts.target_triple);
|
|
self.sess.span_err(span, &message[..]);
|
|
self.sess.abort_if_errors();
|
|
}
|
|
|
|
let registrar = decoder::get_plugin_registrar_fn(ekrate.metadata.as_slice())
|
|
.map(|id| decoder::get_symbol_from_buf(ekrate.metadata.as_slice(), id));
|
|
|
|
match (ekrate.dylib.as_ref(), registrar) {
|
|
(Some(dylib), Some(reg)) => Some((dylib.to_path_buf(), reg)),
|
|
(None, Some(_)) => {
|
|
let message = format!("plugin `{}` only found in rlib format, \
|
|
but must be available in dylib format",
|
|
name);
|
|
self.sess.span_err(span, &message[..]);
|
|
// No need to abort because the loading code will just ignore this
|
|
// empty dylib.
|
|
None
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
fn register_statically_included_foreign_items(&mut self) {
|
|
let libs = self.sess.cstore.get_used_libraries();
|
|
for (lib, list) in self.foreign_item_map.iter() {
|
|
let is_static = libs.borrow().iter().any(|&(ref name, kind)| {
|
|
lib == name && kind == cstore::NativeStatic
|
|
});
|
|
if is_static {
|
|
for id in list {
|
|
self.sess.cstore.add_statically_included_foreign_item(*id);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn inject_allocator_crate(&mut self) {
|
|
// Make sure that we actually need an allocator, if none of our
|
|
// dependencies need one then we definitely don't!
|
|
//
|
|
// Also, if one of our dependencies has an explicit allocator, then we
|
|
// also bail out as we don't need to implicitly inject one.
|
|
let mut needs_allocator = false;
|
|
let mut found_required_allocator = false;
|
|
self.sess.cstore.iter_crate_data(|cnum, data| {
|
|
needs_allocator = needs_allocator || data.needs_allocator();
|
|
if data.is_allocator() {
|
|
debug!("{} required by rlib and is an allocator", data.name());
|
|
self.inject_allocator_dependency(cnum);
|
|
found_required_allocator = found_required_allocator ||
|
|
data.explicitly_linked.get();
|
|
}
|
|
});
|
|
if !needs_allocator || found_required_allocator { return }
|
|
|
|
// At this point we've determined that we need an allocator and no
|
|
// previous allocator has been activated. We look through our outputs of
|
|
// crate types to see what kind of allocator types we may need.
|
|
//
|
|
// The main special output type here is that rlibs do **not** need an
|
|
// allocator linked in (they're just object files), only final products
|
|
// (exes, dylibs, staticlibs) need allocators.
|
|
let mut need_lib_alloc = false;
|
|
let mut need_exe_alloc = false;
|
|
for ct in self.sess.crate_types.borrow().iter() {
|
|
match *ct {
|
|
config::CrateTypeExecutable => need_exe_alloc = true,
|
|
config::CrateTypeDylib |
|
|
config::CrateTypeStaticlib => need_lib_alloc = true,
|
|
config::CrateTypeRlib => {}
|
|
}
|
|
}
|
|
if !need_lib_alloc && !need_exe_alloc { return }
|
|
|
|
// The default allocator crate comes from the custom target spec, and we
|
|
// choose between the standard library allocator or exe allocator. This
|
|
// distinction exists because the default allocator for binaries (where
|
|
// the world is Rust) is different than library (where the world is
|
|
// likely *not* Rust).
|
|
//
|
|
// If a library is being produced, but we're also flagged with `-C
|
|
// prefer-dynamic`, then we interpret this as a *Rust* dynamic library
|
|
// is being produced so we use the exe allocator instead.
|
|
//
|
|
// What this boils down to is:
|
|
//
|
|
// * Binaries use jemalloc
|
|
// * Staticlibs and Rust dylibs use system malloc
|
|
// * Rust dylibs used as dependencies to rust use jemalloc
|
|
let name = if need_lib_alloc && !self.sess.opts.cg.prefer_dynamic {
|
|
&self.sess.target.target.options.lib_allocation_crate
|
|
} else {
|
|
&self.sess.target.target.options.exe_allocation_crate
|
|
};
|
|
let (cnum, data, _) = self.resolve_crate(&None, name, name, None,
|
|
codemap::DUMMY_SP,
|
|
PathKind::Crate, false);
|
|
|
|
// To ensure that the `-Z allocation-crate=foo` option isn't abused, and
|
|
// to ensure that the allocator is indeed an allocator, we verify that
|
|
// the crate loaded here is indeed tagged #![allocator].
|
|
if !data.is_allocator() {
|
|
self.sess.err(&format!("the allocator crate `{}` is not tagged \
|
|
with #![allocator]", data.name()));
|
|
}
|
|
|
|
self.sess.injected_allocator.set(Some(cnum));
|
|
self.inject_allocator_dependency(cnum);
|
|
}
|
|
|
|
fn inject_allocator_dependency(&self, allocator: ast::CrateNum) {
|
|
// Before we inject any dependencies, make sure we don't inject a
|
|
// circular dependency by validating that this allocator crate doesn't
|
|
// transitively depend on any `#![needs_allocator]` crates.
|
|
validate(self, allocator, allocator);
|
|
|
|
// All crates tagged with `needs_allocator` do not explicitly depend on
|
|
// the allocator selected for this compile, but in order for this
|
|
// compilation to be successfully linked we need to inject a dependency
|
|
// (to order the crates on the command line correctly).
|
|
//
|
|
// Here we inject a dependency from all crates with #![needs_allocator]
|
|
// to the crate tagged with #![allocator] for this compilation unit.
|
|
self.sess.cstore.iter_crate_data(|cnum, data| {
|
|
if !data.needs_allocator() {
|
|
return
|
|
}
|
|
|
|
info!("injecting a dep from {} to {}", cnum, allocator);
|
|
let mut cnum_map = data.cnum_map.borrow_mut();
|
|
let remote_cnum = cnum_map.len() + 1;
|
|
let prev = cnum_map.insert(remote_cnum as ast::CrateNum, allocator);
|
|
assert!(prev.is_none());
|
|
});
|
|
|
|
fn validate(me: &CrateReader, krate: ast::CrateNum,
|
|
allocator: ast::CrateNum) {
|
|
let data = me.sess.cstore.get_crate_data(krate);
|
|
if data.needs_allocator() {
|
|
let krate_name = data.name();
|
|
let data = me.sess.cstore.get_crate_data(allocator);
|
|
let alloc_name = data.name();
|
|
me.sess.err(&format!("the allocator crate `{}` cannot depend \
|
|
on a crate that needs an allocator, but \
|
|
it depends on `{}`", alloc_name,
|
|
krate_name));
|
|
}
|
|
|
|
for (_, &dep) in data.cnum_map.borrow().iter() {
|
|
validate(me, dep, allocator);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a, 'b> LocalCrateReader<'a, 'b> {
|
|
pub fn new(sess: &'a Session, map: &'a hir_map::Map<'b>) -> LocalCrateReader<'a, 'b> {
|
|
LocalCrateReader {
|
|
sess: sess,
|
|
creader: CrateReader::new(sess),
|
|
ast_map: map,
|
|
}
|
|
}
|
|
|
|
// Traverses an AST, reading all the information about use'd crates and
|
|
// extern libraries necessary for later resolving, typechecking, linking,
|
|
// etc.
|
|
pub fn read_crates(&mut self, krate: &hir::Crate) {
|
|
self.process_crate(krate);
|
|
visit::walk_crate(self, krate);
|
|
self.creader.inject_allocator_crate();
|
|
|
|
if log_enabled!(log::INFO) {
|
|
dump_crates(&self.sess.cstore);
|
|
}
|
|
|
|
for &(ref name, kind) in &self.sess.opts.libs {
|
|
register_native_lib(self.sess, None, name.clone(), kind);
|
|
}
|
|
self.creader.register_statically_included_foreign_items();
|
|
}
|
|
|
|
fn process_crate(&self, c: &hir::Crate) {
|
|
for a in c.attrs.iter().filter(|m| m.name() == "link_args") {
|
|
match a.value_str() {
|
|
Some(ref linkarg) => self.sess.cstore.add_used_link_args(&linkarg),
|
|
None => { /* fallthrough */ }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn process_item(&mut self, i: &hir::Item) {
|
|
match i.node {
|
|
hir::ItemExternCrate(_) => {
|
|
if !should_link_hir(i) {
|
|
return;
|
|
}
|
|
|
|
match self.creader.extract_crate_info_hir(i) {
|
|
Some(info) => {
|
|
let (cnum, cmeta, _) = self.creader.resolve_crate(&None,
|
|
&info.ident,
|
|
&info.name,
|
|
None,
|
|
i.span,
|
|
PathKind::Crate,
|
|
true);
|
|
self.ast_map.with_path(i.id, |path| {
|
|
cmeta.update_local_path(path)
|
|
});
|
|
self.sess.cstore.add_extern_mod_stmt_cnum(info.id, cnum);
|
|
}
|
|
None => ()
|
|
}
|
|
}
|
|
hir::ItemForeignMod(ref fm) => self.process_foreign_mod(i, fm),
|
|
_ => { }
|
|
}
|
|
}
|
|
|
|
fn process_foreign_mod(&mut self, i: &hir::Item, fm: &hir::ForeignMod) {
|
|
if fm.abi == abi::Rust || fm.abi == abi::RustIntrinsic || fm.abi == abi::PlatformIntrinsic {
|
|
return;
|
|
}
|
|
|
|
// First, add all of the custom #[link_args] attributes
|
|
for m in i.attrs.iter().filter(|a| a.check_name("link_args")) {
|
|
if let Some(linkarg) = m.value_str() {
|
|
self.sess.cstore.add_used_link_args(&linkarg);
|
|
}
|
|
}
|
|
|
|
// Next, process all of the #[link(..)]-style arguments
|
|
for m in i.attrs.iter().filter(|a| a.check_name("link")) {
|
|
let items = match m.meta_item_list() {
|
|
Some(item) => item,
|
|
None => continue,
|
|
};
|
|
let kind = items.iter().find(|k| {
|
|
k.check_name("kind")
|
|
}).and_then(|a| a.value_str());
|
|
let kind = match kind.as_ref().map(|s| &s[..]) {
|
|
Some("static") => cstore::NativeStatic,
|
|
Some("dylib") => cstore::NativeUnknown,
|
|
Some("framework") => cstore::NativeFramework,
|
|
Some(k) => {
|
|
self.sess.span_err(m.span, &format!("unknown kind: `{}`", k));
|
|
cstore::NativeUnknown
|
|
}
|
|
None => cstore::NativeUnknown
|
|
};
|
|
let n = items.iter().find(|n| {
|
|
n.check_name("name")
|
|
}).and_then(|a| a.value_str());
|
|
let n = match n {
|
|
Some(n) => n,
|
|
None => {
|
|
self.sess.span_err(m.span, "#[link(...)] specified without \
|
|
`name = \"foo\"`");
|
|
InternedString::new("foo")
|
|
}
|
|
};
|
|
register_native_lib(self.sess, Some(m.span), n.to_string(), kind);
|
|
}
|
|
|
|
// Finally, process the #[linked_from = "..."] attribute
|
|
for m in i.attrs.iter().filter(|a| a.check_name("linked_from")) {
|
|
let lib_name = match m.value_str() {
|
|
Some(name) => name,
|
|
None => continue,
|
|
};
|
|
let list = self.creader.foreign_item_map.entry(lib_name.to_string())
|
|
.or_insert(Vec::new());
|
|
list.extend(fm.items.iter().map(|it| it.id));
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Imports the codemap from an external crate into the codemap of the crate
|
|
/// currently being compiled (the "local crate").
|
|
///
|
|
/// The import algorithm works analogous to how AST items are inlined from an
|
|
/// external crate's metadata:
|
|
/// For every FileMap in the external codemap an 'inline' copy is created in the
|
|
/// local codemap. The correspondence relation between external and local
|
|
/// FileMaps is recorded in the `ImportedFileMap` objects returned from this
|
|
/// function. When an item from an external crate is later inlined into this
|
|
/// crate, this correspondence information is used to translate the span
|
|
/// information of the inlined item so that it refers the correct positions in
|
|
/// the local codemap (see `astencode::DecodeContext::tr_span()`).
|
|
///
|
|
/// The import algorithm in the function below will reuse FileMaps already
|
|
/// existing in the local codemap. For example, even if the FileMap of some
|
|
/// source file of libstd gets imported many times, there will only ever be
|
|
/// one FileMap object for the corresponding file in the local codemap.
|
|
///
|
|
/// Note that imported FileMaps do not actually contain the source code of the
|
|
/// file they represent, just information about length, line breaks, and
|
|
/// multibyte characters. This information is enough to generate valid debuginfo
|
|
/// for items inlined from other crates.
|
|
pub fn import_codemap(local_codemap: &codemap::CodeMap,
|
|
metadata: &MetadataBlob)
|
|
-> Vec<cstore::ImportedFileMap> {
|
|
let external_codemap = decoder::get_imported_filemaps(metadata.as_slice());
|
|
|
|
let imported_filemaps = external_codemap.into_iter().map(|filemap_to_import| {
|
|
// Try to find an existing FileMap that can be reused for the filemap to
|
|
// be imported. A FileMap is reusable if it is exactly the same, just
|
|
// positioned at a different offset within the codemap.
|
|
let reusable_filemap = {
|
|
local_codemap.files
|
|
.borrow()
|
|
.iter()
|
|
.find(|fm| are_equal_modulo_startpos(&fm, &filemap_to_import))
|
|
.map(|rc| rc.clone())
|
|
};
|
|
|
|
match reusable_filemap {
|
|
Some(fm) => {
|
|
cstore::ImportedFileMap {
|
|
original_start_pos: filemap_to_import.start_pos,
|
|
original_end_pos: filemap_to_import.end_pos,
|
|
translated_filemap: fm
|
|
}
|
|
}
|
|
None => {
|
|
// We can't reuse an existing FileMap, so allocate a new one
|
|
// containing the information we need.
|
|
let codemap::FileMap {
|
|
name,
|
|
start_pos,
|
|
end_pos,
|
|
lines,
|
|
multibyte_chars,
|
|
..
|
|
} = filemap_to_import;
|
|
|
|
let source_length = (end_pos - start_pos).to_usize();
|
|
|
|
// Translate line-start positions and multibyte character
|
|
// position into frame of reference local to file.
|
|
// `CodeMap::new_imported_filemap()` will then translate those
|
|
// coordinates to their new global frame of reference when the
|
|
// offset of the FileMap is known.
|
|
let mut lines = lines.into_inner();
|
|
for pos in &mut lines {
|
|
*pos = *pos - start_pos;
|
|
}
|
|
let mut multibyte_chars = multibyte_chars.into_inner();
|
|
for mbc in &mut multibyte_chars {
|
|
mbc.pos = mbc.pos - start_pos;
|
|
}
|
|
|
|
let local_version = local_codemap.new_imported_filemap(name,
|
|
source_length,
|
|
lines,
|
|
multibyte_chars);
|
|
cstore::ImportedFileMap {
|
|
original_start_pos: start_pos,
|
|
original_end_pos: end_pos,
|
|
translated_filemap: local_version
|
|
}
|
|
}
|
|
}
|
|
}).collect();
|
|
|
|
return imported_filemaps;
|
|
|
|
fn are_equal_modulo_startpos(fm1: &codemap::FileMap,
|
|
fm2: &codemap::FileMap)
|
|
-> bool {
|
|
if fm1.name != fm2.name {
|
|
return false;
|
|
}
|
|
|
|
let lines1 = fm1.lines.borrow();
|
|
let lines2 = fm2.lines.borrow();
|
|
|
|
if lines1.len() != lines2.len() {
|
|
return false;
|
|
}
|
|
|
|
for (&line1, &line2) in lines1.iter().zip(lines2.iter()) {
|
|
if (line1 - fm1.start_pos) != (line2 - fm2.start_pos) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
let multibytes1 = fm1.multibyte_chars.borrow();
|
|
let multibytes2 = fm2.multibyte_chars.borrow();
|
|
|
|
if multibytes1.len() != multibytes2.len() {
|
|
return false;
|
|
}
|
|
|
|
for (mb1, mb2) in multibytes1.iter().zip(multibytes2.iter()) {
|
|
if (mb1.bytes != mb2.bytes) ||
|
|
((mb1.pos - fm1.start_pos) != (mb2.pos - fm2.start_pos)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
true
|
|
}
|
|
}
|