1192 lines
48 KiB
Rust
1192 lines
48 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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//! Validates all used crates and extern libraries and loads their metadata
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use cstore::{self, CStore, CrateSource, MetadataBlob};
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use locator::{self, CratePaths};
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use schema::CrateRoot;
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use rustc::hir::def_id::{CrateNum, DefIndex};
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use rustc::hir::svh::Svh;
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use rustc::middle::cstore::DepKind;
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use rustc::session::Session;
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use rustc::session::config::{Sanitizer, self};
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use rustc_back::PanicStrategy;
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use rustc::session::search_paths::PathKind;
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use rustc::middle;
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use rustc::middle::cstore::{CrateStore, validate_crate_name, ExternCrate};
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use rustc::util::common::record_time;
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use rustc::util::nodemap::FxHashSet;
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use rustc::middle::cstore::NativeLibrary;
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use rustc::hir::map::Definitions;
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use std::cell::{RefCell, Cell};
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use std::ops::Deref;
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::{cmp, fs};
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use syntax::ast;
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use syntax::abi::Abi;
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use syntax::attr;
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use syntax::ext::base::SyntaxExtension;
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use syntax::feature_gate::{self, GateIssue};
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use syntax::symbol::Symbol;
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use syntax_pos::{Span, DUMMY_SP};
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use log;
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pub struct Library {
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pub dylib: Option<(PathBuf, PathKind)>,
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pub rlib: Option<(PathBuf, PathKind)>,
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pub rmeta: Option<(PathBuf, PathKind)>,
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pub metadata: MetadataBlob,
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}
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pub struct CrateLoader<'a> {
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pub sess: &'a Session,
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cstore: &'a CStore,
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next_crate_num: CrateNum,
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local_crate_name: Symbol,
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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(|_, data| {
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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.dep_kind.get());
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let CrateSource { dylib, rlib, rmeta } = data.source.clone();
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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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rmeta.map(|rl| info!(" rmeta: {}", rl.0.display()));
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});
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}
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#[derive(Debug)]
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struct ExternCrateInfo {
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ident: Symbol,
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name: Symbol,
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id: ast::NodeId,
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dep_kind: DepKind,
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}
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fn register_native_lib(sess: &Session,
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cstore: &CStore,
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span: Option<Span>,
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lib: NativeLibrary) {
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if lib.name.as_str().is_empty() {
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match span {
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Some(span) => {
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struct_span_err!(sess, span, E0454,
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"#[link(name = \"\")] given with empty name")
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.span_label(span, &format!("empty name given"))
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.emit();
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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 lib.kind == cstore::NativeFramework && !is_osx {
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let msg = "native frameworks are only available on macOS targets";
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match span {
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Some(span) => span_err!(sess, span, E0455, "{}", msg),
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None => sess.err(msg),
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}
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}
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if lib.cfg.is_some() && !sess.features.borrow().link_cfg {
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feature_gate::emit_feature_err(&sess.parse_sess,
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"link_cfg",
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span.unwrap(),
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GateIssue::Language,
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"is feature gated");
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}
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if lib.kind == cstore::NativeStaticNobundle && !sess.features.borrow().static_nobundle {
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feature_gate::emit_feature_err(&sess.parse_sess,
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"static_nobundle",
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span.unwrap(),
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GateIssue::Language,
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"kind=\"static-nobundle\" is feature gated");
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}
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cstore.add_used_library(lib);
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}
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fn relevant_lib(sess: &Session, lib: &NativeLibrary) -> bool {
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match lib.cfg {
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Some(ref cfg) => attr::cfg_matches(cfg, &sess.parse_sess, None),
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None => true,
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}
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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::CrateMetadata>),
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Owned(Library),
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}
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impl Deref for PMDSource {
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type Target = MetadataBlob;
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fn deref(&self) -> &MetadataBlob {
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match *self {
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PMDSource::Registered(ref cmd) => &cmd.blob,
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PMDSource::Owned(ref lib) => &lib.metadata
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}
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}
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}
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enum LoadResult {
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Previous(CrateNum),
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Loaded(Library),
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}
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impl<'a> CrateLoader<'a> {
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pub fn new(sess: &'a Session, cstore: &'a CStore, local_crate_name: &str) -> Self {
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CrateLoader {
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sess: sess,
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cstore: cstore,
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next_crate_num: cstore.next_crate_num(),
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local_crate_name: Symbol::intern(local_crate_name),
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}
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}
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fn extract_crate_info(&self, i: &ast::Item) -> Option<ExternCrateInfo> {
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match i.node {
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ast::ItemKind::ExternCrate(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
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}
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None => i.ident.name,
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};
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Some(ExternCrateInfo {
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ident: i.ident.name,
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name: name,
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id: i.id,
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dep_kind: if attr::contains_name(&i.attrs, "no_link") {
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DepKind::UnexportedMacrosOnly
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} else {
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DepKind::Explicit
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},
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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: Symbol, hash: Option<&Svh>, kind: PathKind)
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-> Option<CrateNum> {
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let mut ret = None;
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self.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.cstore.used_crate_source(cnum);
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if let Some(locs) = self.sess.opts.externs.get(&*name.as_str()) {
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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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.or(source.rmeta.as_ref())
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.expect("No sources for crate").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 verify_no_symbol_conflicts(&self,
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span: Span,
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root: &CrateRoot) {
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// Check for (potential) conflicts with the local crate
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if self.local_crate_name == root.name &&
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self.sess.local_crate_disambiguator() == root.disambiguator {
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span_fatal!(self.sess, span, E0519,
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"the current crate is indistinguishable from one of its \
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dependencies: it has the same crate-name `{}` and was \
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compiled with the same `-C metadata` arguments. This \
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will result in symbol conflicts between the two.",
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root.name)
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}
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// Check for conflicts with any crate loaded so far
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self.cstore.iter_crate_data(|_, other| {
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if other.name() == root.name && // same crate-name
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other.disambiguator() == root.disambiguator && // same crate-disambiguator
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other.hash() != root.hash { // but different SVH
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span_fatal!(self.sess, span, E0523,
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"found two different crates with name `{}` that are \
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not distinguished by differing `-C metadata`. This \
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will result in symbol conflicts between the two.",
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root.name)
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}
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});
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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: Symbol,
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name: Symbol,
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span: Span,
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lib: Library,
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dep_kind: DepKind)
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-> (CrateNum, Rc<cstore::CrateMetadata>) {
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info!("register crate `extern crate {} as {}`", name, ident);
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let crate_root = lib.metadata.get_root();
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self.verify_no_symbol_conflicts(span, &crate_root);
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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 = CrateNum::from_u32(cnum.as_u32() + 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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rmeta: lib.rmeta.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 Library { dylib, rlib, rmeta, metadata } = lib;
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let cnum_map = self.resolve_crate_deps(root, &crate_root, &metadata, cnum, span, dep_kind);
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let def_path_table = record_time(&self.sess.perf_stats.decode_def_path_tables_time, || {
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crate_root.def_path_table.decode(&metadata)
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});
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let exported_symbols = crate_root.exported_symbols.decode(&metadata).collect();
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let mut cmeta = cstore::CrateMetadata {
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name: name,
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extern_crate: Cell::new(None),
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def_path_table: def_path_table,
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exported_symbols: exported_symbols,
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proc_macros: crate_root.macro_derive_registrar.map(|_| {
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self.load_derive_macros(&crate_root, dylib.clone().map(|p| p.0), span)
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}),
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root: crate_root,
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blob: 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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attribute_cache: RefCell::new([Vec::new(), Vec::new()]),
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dep_kind: Cell::new(dep_kind),
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source: cstore::CrateSource {
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dylib: dylib,
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rlib: rlib,
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rmeta: rmeta,
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},
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dllimport_foreign_items: FxHashSet(),
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};
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let dllimports: Vec<_> = cmeta.get_native_libraries().iter()
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.filter(|lib| relevant_lib(self.sess, lib) &&
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lib.kind == cstore::NativeLibraryKind::NativeUnknown)
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.flat_map(|lib| &lib.foreign_items)
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.map(|id| *id)
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.collect();
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cmeta.dllimport_foreign_items.extend(dllimports);
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let cmeta = Rc::new(cmeta);
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self.cstore.set_crate_data(cnum, cmeta.clone());
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(cnum, cmeta)
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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: Symbol,
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name: Symbol,
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hash: Option<&Svh>,
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span: Span,
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path_kind: PathKind,
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mut dep_kind: DepKind)
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-> (CrateNum, Rc<cstore::CrateMetadata>) {
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info!("resolving crate `extern crate {} as {}`", name, ident);
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let result = if let Some(cnum) = self.existing_match(name, hash, path_kind) {
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LoadResult::Previous(cnum)
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} else {
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info!("falling back to a load");
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let mut locate_ctxt = locator::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(path_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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rejected_via_version: vec![],
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rejected_via_filename: vec![],
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should_match_name: true,
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is_proc_macro: Some(false),
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};
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self.load(&mut locate_ctxt).or_else(|| {
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dep_kind = DepKind::UnexportedMacrosOnly;
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let mut proc_macro_locator = locator::Context {
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target: &self.sess.host,
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triple: config::host_triple(),
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filesearch: self.sess.host_filesearch(path_kind),
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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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rejected_via_version: vec![],
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rejected_via_filename: vec![],
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is_proc_macro: Some(true),
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..locate_ctxt
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};
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self.load(&mut proc_macro_locator)
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}).unwrap_or_else(|| locate_ctxt.report_errs())
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};
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match result {
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LoadResult::Previous(cnum) => {
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let data = self.cstore.get_crate_data(cnum);
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if data.root.macro_derive_registrar.is_some() {
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dep_kind = DepKind::UnexportedMacrosOnly;
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}
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data.dep_kind.set(cmp::max(data.dep_kind.get(), dep_kind));
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(cnum, data)
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}
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LoadResult::Loaded(library) => {
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self.register_crate(root, ident, name, span, library, dep_kind)
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}
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}
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}
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fn load(&mut self, locate_ctxt: &mut locator::Context) -> Option<LoadResult> {
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let library = match locate_ctxt.maybe_load_library_crate() {
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Some(lib) => lib,
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None => return None,
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};
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// In the case that we're loading a crate, but not matching
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// against a hash, we could load a crate which has the same hash
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// as an already loaded crate. If this is the case prevent
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// duplicates by just using the first crate.
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//
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// Note that we only do this for target triple crates, though, as we
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// don't want to match a host crate against an equivalent target one
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// already loaded.
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let root = library.metadata.get_root();
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if locate_ctxt.triple == self.sess.opts.target_triple {
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let mut result = LoadResult::Loaded(library);
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self.cstore.iter_crate_data(|cnum, data| {
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if data.name() == root.name && root.hash == data.hash() {
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assert!(locate_ctxt.hash.is_none());
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info!("load success, going to previous cnum: {}", cnum);
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result = LoadResult::Previous(cnum);
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}
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});
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Some(result)
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} else {
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Some(LoadResult::Loaded(library))
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}
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}
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fn update_extern_crate(&mut self,
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cnum: CrateNum,
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mut extern_crate: ExternCrate,
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visited: &mut FxHashSet<(CrateNum, bool)>)
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{
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if !visited.insert((cnum, extern_crate.direct)) { return }
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let cmeta = self.cstore.get_crate_data(cnum);
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let old_extern_crate = cmeta.extern_crate.get();
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// Prefer:
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// - something over nothing (tuple.0);
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// - direct extern crate to indirect (tuple.1);
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// - shorter paths to longer (tuple.2).
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let new_rank = (true, extern_crate.direct, !extern_crate.path_len);
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let old_rank = match old_extern_crate {
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None => (false, false, !0),
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Some(ref c) => (true, c.direct, !c.path_len),
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};
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if old_rank >= new_rank {
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return; // no change needed
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}
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cmeta.extern_crate.set(Some(extern_crate));
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// Propagate the extern crate info to dependencies.
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extern_crate.direct = false;
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for &dep_cnum in cmeta.cnum_map.borrow().iter() {
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self.update_extern_crate(dep_cnum, extern_crate, visited);
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}
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}
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|
|
// Go through the crate metadata and load any crates that it references
|
|
fn resolve_crate_deps(&mut self,
|
|
root: &Option<CratePaths>,
|
|
crate_root: &CrateRoot,
|
|
metadata: &MetadataBlob,
|
|
krate: CrateNum,
|
|
span: Span,
|
|
dep_kind: DepKind)
|
|
-> cstore::CrateNumMap {
|
|
debug!("resolving deps of external crate");
|
|
if crate_root.macro_derive_registrar.is_some() {
|
|
return cstore::CrateNumMap::new();
|
|
}
|
|
|
|
// The map from crate numbers in the crate we're resolving to local crate numbers.
|
|
// We map 0 and all other holes in the map to our parent crate. The "additional"
|
|
// self-dependencies should be harmless.
|
|
::std::iter::once(krate).chain(crate_root.crate_deps.decode(metadata).map(|dep| {
|
|
debug!("resolving dep crate {} hash: `{}`", dep.name, dep.hash);
|
|
if dep.kind == DepKind::UnexportedMacrosOnly {
|
|
return krate;
|
|
}
|
|
let dep_kind = match dep_kind {
|
|
DepKind::MacrosOnly => DepKind::MacrosOnly,
|
|
_ => dep.kind,
|
|
};
|
|
let (local_cnum, ..) = self.resolve_crate(
|
|
root, dep.name, dep.name, Some(&dep.hash), span, PathKind::Dependency, dep_kind,
|
|
);
|
|
local_cnum
|
|
})).collect()
|
|
}
|
|
|
|
fn read_extension_crate(&mut self, span: Span, info: &ExternCrateInfo) -> ExtensionCrate {
|
|
info!("read extension crate {} `extern crate {} as {}` dep_kind={:?}",
|
|
info.id, info.name, info.ident, info.dep_kind);
|
|
let target_triple = &self.sess.opts.target_triple[..];
|
|
let is_cross = target_triple != config::host_triple();
|
|
let mut target_only = false;
|
|
let mut locate_ctxt = locator::Context {
|
|
sess: self.sess,
|
|
span: span,
|
|
ident: info.ident,
|
|
crate_name: info.name,
|
|
hash: None,
|
|
filesearch: self.sess.host_filesearch(PathKind::Crate),
|
|
target: &self.sess.host,
|
|
triple: config::host_triple(),
|
|
root: &None,
|
|
rejected_via_hash: vec![],
|
|
rejected_via_triple: vec![],
|
|
rejected_via_kind: vec![],
|
|
rejected_via_version: vec![],
|
|
rejected_via_filename: vec![],
|
|
should_match_name: true,
|
|
is_proc_macro: None,
|
|
};
|
|
let library = self.load(&mut locate_ctxt).or_else(|| {
|
|
if !is_cross {
|
|
return None
|
|
}
|
|
// Try loading from target crates. This will abort later if we
|
|
// try to load a plugin registrar function,
|
|
target_only = true;
|
|
|
|
locate_ctxt.target = &self.sess.target.target;
|
|
locate_ctxt.triple = target_triple;
|
|
locate_ctxt.filesearch = self.sess.target_filesearch(PathKind::Crate);
|
|
|
|
self.load(&mut locate_ctxt)
|
|
});
|
|
let library = match library {
|
|
Some(l) => l,
|
|
None => locate_ctxt.report_errs(),
|
|
};
|
|
|
|
let (dylib, metadata) = match library {
|
|
LoadResult::Previous(cnum) => {
|
|
let data = self.cstore.get_crate_data(cnum);
|
|
(data.source.dylib.clone(), PMDSource::Registered(data))
|
|
}
|
|
LoadResult::Loaded(library) => {
|
|
let dylib = library.dylib.clone();
|
|
let metadata = PMDSource::Owned(library);
|
|
(dylib, metadata)
|
|
}
|
|
};
|
|
|
|
ExtensionCrate {
|
|
metadata: metadata,
|
|
dylib: dylib.map(|p| p.0),
|
|
target_only: target_only,
|
|
}
|
|
}
|
|
|
|
/// Load custom derive macros.
|
|
///
|
|
/// Note that this is intentionally similar to how we load plugins today,
|
|
/// but also intentionally separate. Plugins are likely always going to be
|
|
/// implemented as dynamic libraries, but we have a possible future where
|
|
/// custom derive (and other macro-1.1 style features) are implemented via
|
|
/// executables and custom IPC.
|
|
fn load_derive_macros(&mut self, root: &CrateRoot, dylib: Option<PathBuf>, span: Span)
|
|
-> Vec<(ast::Name, Rc<SyntaxExtension>)> {
|
|
use std::{env, mem};
|
|
use proc_macro::TokenStream;
|
|
use proc_macro::__internal::Registry;
|
|
use rustc_back::dynamic_lib::DynamicLibrary;
|
|
use syntax_ext::deriving::custom::ProcMacroDerive;
|
|
use syntax_ext::proc_macro_impl::{AttrProcMacro, BangProcMacro};
|
|
|
|
let path = match dylib {
|
|
Some(dylib) => dylib,
|
|
None => span_bug!(span, "proc-macro crate not dylib"),
|
|
};
|
|
// Make sure the path contains a / or the linker will search for it.
|
|
let path = env::current_dir().unwrap().join(path);
|
|
let lib = match DynamicLibrary::open(Some(&path)) {
|
|
Ok(lib) => lib,
|
|
Err(err) => self.sess.span_fatal(span, &err),
|
|
};
|
|
|
|
let sym = self.sess.generate_derive_registrar_symbol(root.disambiguator,
|
|
root.macro_derive_registrar.unwrap());
|
|
let registrar = unsafe {
|
|
let sym = match lib.symbol(&sym) {
|
|
Ok(f) => f,
|
|
Err(err) => self.sess.span_fatal(span, &err),
|
|
};
|
|
mem::transmute::<*mut u8, fn(&mut Registry)>(sym)
|
|
};
|
|
|
|
struct MyRegistrar(Vec<(ast::Name, Rc<SyntaxExtension>)>);
|
|
|
|
impl Registry for MyRegistrar {
|
|
fn register_custom_derive(&mut self,
|
|
trait_name: &str,
|
|
expand: fn(TokenStream) -> TokenStream,
|
|
attributes: &[&'static str]) {
|
|
let attrs = attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
|
|
let derive = ProcMacroDerive::new(expand, attrs.clone());
|
|
let derive = SyntaxExtension::ProcMacroDerive(Box::new(derive), attrs);
|
|
self.0.push((Symbol::intern(trait_name), Rc::new(derive)));
|
|
}
|
|
|
|
fn register_attr_proc_macro(&mut self,
|
|
name: &str,
|
|
expand: fn(TokenStream, TokenStream) -> TokenStream) {
|
|
let expand = SyntaxExtension::AttrProcMacro(
|
|
Box::new(AttrProcMacro { inner: expand })
|
|
);
|
|
self.0.push((Symbol::intern(name), Rc::new(expand)));
|
|
}
|
|
|
|
fn register_bang_proc_macro(&mut self,
|
|
name: &str,
|
|
expand: fn(TokenStream) -> TokenStream) {
|
|
let expand = SyntaxExtension::ProcMacro(
|
|
Box::new(BangProcMacro { inner: expand })
|
|
);
|
|
self.0.push((Symbol::intern(name), Rc::new(expand)));
|
|
}
|
|
}
|
|
|
|
let mut my_registrar = MyRegistrar(Vec::new());
|
|
registrar(&mut my_registrar);
|
|
|
|
// Intentionally leak the dynamic library. We can't ever unload it
|
|
// since the library can make things that will live arbitrarily long.
|
|
mem::forget(lib);
|
|
my_registrar.0
|
|
}
|
|
|
|
/// Look for a plugin registrar. Returns library path, crate
|
|
/// SVH and DefIndex of the registrar function.
|
|
pub fn find_plugin_registrar(&mut self, span: Span, name: &str)
|
|
-> Option<(PathBuf, Symbol, DefIndex)> {
|
|
let ekrate = self.read_extension_crate(span, &ExternCrateInfo {
|
|
name: Symbol::intern(name),
|
|
ident: Symbol::intern(name),
|
|
id: ast::DUMMY_NODE_ID,
|
|
dep_kind: DepKind::UnexportedMacrosOnly,
|
|
});
|
|
|
|
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);
|
|
span_fatal!(self.sess, span, E0456, "{}", &message);
|
|
}
|
|
|
|
let root = ekrate.metadata.get_root();
|
|
match (ekrate.dylib.as_ref(), root.plugin_registrar_fn) {
|
|
(Some(dylib), Some(reg)) => {
|
|
Some((dylib.to_path_buf(), root.disambiguator, reg))
|
|
}
|
|
(None, Some(_)) => {
|
|
span_err!(self.sess, span, E0457,
|
|
"plugin `{}` only found in rlib format, but must be available \
|
|
in dylib format",
|
|
name);
|
|
// No need to abort because the loading code will just ignore this
|
|
// empty dylib.
|
|
None
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
fn get_foreign_items_of_kind(&self, kind: cstore::NativeLibraryKind) -> Vec<DefIndex> {
|
|
let mut items = vec![];
|
|
let libs = self.cstore.get_used_libraries();
|
|
for lib in libs.borrow().iter() {
|
|
if relevant_lib(self.sess, lib) && lib.kind == kind {
|
|
items.extend(&lib.foreign_items);
|
|
}
|
|
}
|
|
items
|
|
}
|
|
|
|
fn register_statically_included_foreign_items(&mut self) {
|
|
for id in self.get_foreign_items_of_kind(cstore::NativeStatic) {
|
|
self.cstore.add_statically_included_foreign_item(id);
|
|
}
|
|
for id in self.get_foreign_items_of_kind(cstore::NativeStaticNobundle) {
|
|
self.cstore.add_statically_included_foreign_item(id);
|
|
}
|
|
}
|
|
|
|
fn register_dllimport_foreign_items(&mut self) {
|
|
let mut dllimports = self.cstore.dllimport_foreign_items.borrow_mut();
|
|
for id in self.get_foreign_items_of_kind(cstore::NativeUnknown) {
|
|
dllimports.insert(id);
|
|
}
|
|
}
|
|
|
|
fn inject_panic_runtime(&mut self, krate: &ast::Crate) {
|
|
// If we're only compiling an rlib, then there's no need to select a
|
|
// panic runtime, so we just skip this section entirely.
|
|
let any_non_rlib = self.sess.crate_types.borrow().iter().any(|ct| {
|
|
*ct != config::CrateTypeRlib
|
|
});
|
|
if !any_non_rlib {
|
|
info!("panic runtime injection skipped, only generating rlib");
|
|
return
|
|
}
|
|
|
|
// If we need a panic runtime, we try to find an existing one here. At
|
|
// the same time we perform some general validation of the DAG we've got
|
|
// going such as ensuring everything has a compatible panic strategy.
|
|
//
|
|
// The logic for finding the panic runtime here is pretty much the same
|
|
// as the allocator case with the only addition that the panic strategy
|
|
// compilation mode also comes into play.
|
|
let desired_strategy = self.sess.panic_strategy();
|
|
let mut runtime_found = false;
|
|
let mut needs_panic_runtime = attr::contains_name(&krate.attrs,
|
|
"needs_panic_runtime");
|
|
self.cstore.iter_crate_data(|cnum, data| {
|
|
needs_panic_runtime = needs_panic_runtime || data.needs_panic_runtime();
|
|
if data.is_panic_runtime() {
|
|
// Inject a dependency from all #![needs_panic_runtime] to this
|
|
// #![panic_runtime] crate.
|
|
self.inject_dependency_if(cnum, "a panic runtime",
|
|
&|data| data.needs_panic_runtime());
|
|
runtime_found = runtime_found || data.dep_kind.get() == DepKind::Explicit;
|
|
}
|
|
});
|
|
|
|
// If an explicitly linked and matching panic runtime was found, or if
|
|
// we just don't need one at all, then we're done here and there's
|
|
// nothing else to do.
|
|
if !needs_panic_runtime || runtime_found {
|
|
return
|
|
}
|
|
|
|
// By this point we know that we (a) need a panic runtime and (b) no
|
|
// panic runtime was explicitly linked. Here we just load an appropriate
|
|
// default runtime for our panic strategy and then inject the
|
|
// dependencies.
|
|
//
|
|
// We may resolve to an already loaded crate (as the crate may not have
|
|
// been explicitly linked prior to this) and we may re-inject
|
|
// dependencies again, but both of those situations are fine.
|
|
//
|
|
// Also note that we have yet to perform validation of the crate graph
|
|
// in terms of everyone has a compatible panic runtime format, that's
|
|
// performed later as part of the `dependency_format` module.
|
|
let name = match desired_strategy {
|
|
PanicStrategy::Unwind => Symbol::intern("panic_unwind"),
|
|
PanicStrategy::Abort => Symbol::intern("panic_abort"),
|
|
};
|
|
info!("panic runtime not found -- loading {}", name);
|
|
|
|
let dep_kind = DepKind::Implicit;
|
|
let (cnum, data) =
|
|
self.resolve_crate(&None, name, name, None, DUMMY_SP, PathKind::Crate, dep_kind);
|
|
|
|
// Sanity check the loaded crate to ensure it is indeed a panic runtime
|
|
// and the panic strategy is indeed what we thought it was.
|
|
if !data.is_panic_runtime() {
|
|
self.sess.err(&format!("the crate `{}` is not a panic runtime",
|
|
name));
|
|
}
|
|
if data.panic_strategy() != desired_strategy {
|
|
self.sess.err(&format!("the crate `{}` does not have the panic \
|
|
strategy `{}`",
|
|
name, desired_strategy.desc()));
|
|
}
|
|
|
|
self.sess.injected_panic_runtime.set(Some(cnum));
|
|
self.inject_dependency_if(cnum, "a panic runtime",
|
|
&|data| data.needs_panic_runtime());
|
|
}
|
|
|
|
fn inject_sanitizer_runtime(&mut self) {
|
|
if let Some(ref sanitizer) = self.sess.opts.debugging_opts.sanitizer {
|
|
// Sanitizers can only be used on some tested platforms with
|
|
// executables linked to `std`
|
|
const ASAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu",
|
|
"x86_64-apple-darwin"];
|
|
const TSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu",
|
|
"x86_64-apple-darwin"];
|
|
const LSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu"];
|
|
const MSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu"];
|
|
|
|
let supported_targets = match *sanitizer {
|
|
Sanitizer::Address => ASAN_SUPPORTED_TARGETS,
|
|
Sanitizer::Thread => TSAN_SUPPORTED_TARGETS,
|
|
Sanitizer::Leak => LSAN_SUPPORTED_TARGETS,
|
|
Sanitizer::Memory => MSAN_SUPPORTED_TARGETS,
|
|
};
|
|
if !supported_targets.contains(&&*self.sess.target.target.llvm_target) {
|
|
self.sess.err(&format!("{:?}Sanitizer only works with the `{}` target",
|
|
sanitizer,
|
|
supported_targets.join("` or `")
|
|
));
|
|
return
|
|
}
|
|
|
|
if !self.sess.crate_types.borrow().iter().all(|ct| {
|
|
match *ct {
|
|
// Link the runtime
|
|
config::CrateTypeExecutable => true,
|
|
// This crate will be compiled with the required
|
|
// instrumentation pass
|
|
config::CrateTypeRlib => false,
|
|
_ => {
|
|
self.sess.err(&format!("Only executables and rlibs can be \
|
|
compiled with `-Z sanitizer`"));
|
|
false
|
|
}
|
|
}
|
|
}) {
|
|
return
|
|
}
|
|
|
|
let mut uses_std = false;
|
|
self.cstore.iter_crate_data(|_, data| {
|
|
if data.name == "std" {
|
|
uses_std = true;
|
|
}
|
|
});
|
|
|
|
if uses_std {
|
|
let name = match *sanitizer {
|
|
Sanitizer::Address => "rustc_asan",
|
|
Sanitizer::Leak => "rustc_lsan",
|
|
Sanitizer::Memory => "rustc_msan",
|
|
Sanitizer::Thread => "rustc_tsan",
|
|
};
|
|
info!("loading sanitizer: {}", name);
|
|
|
|
let symbol = Symbol::intern(name);
|
|
let dep_kind = DepKind::Implicit;
|
|
let (_, data) =
|
|
self.resolve_crate(&None, symbol, symbol, None, DUMMY_SP,
|
|
PathKind::Crate, dep_kind);
|
|
|
|
// Sanity check the loaded crate to ensure it is indeed a sanitizer runtime
|
|
if !data.is_sanitizer_runtime() {
|
|
self.sess.err(&format!("the crate `{}` is not a sanitizer runtime",
|
|
name));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn inject_profiler_runtime(&mut self) {
|
|
if self.sess.opts.debugging_opts.profile {
|
|
let mut uses_std = false;
|
|
self.cstore.iter_crate_data(|_, data| {
|
|
if data.name == "std" {
|
|
uses_std = true;
|
|
}
|
|
});
|
|
|
|
if uses_std {
|
|
info!("loading profiler");
|
|
|
|
let symbol = Symbol::intern("profiler_builtins");
|
|
let dep_kind = DepKind::Implicit;
|
|
let (_, data) =
|
|
self.resolve_crate(&None, symbol, symbol, None, DUMMY_SP,
|
|
PathKind::Crate, dep_kind);
|
|
|
|
// Sanity check the loaded crate to ensure it is indeed a profiler runtime
|
|
if !data.is_profiler_runtime() {
|
|
self.sess.err(&format!("the crate `profiler_builtins` is not \
|
|
a profiler runtime"));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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.cstore.iter_crate_data(|cnum, data| {
|
|
needs_allocator = needs_allocator || data.needs_allocator();
|
|
if data.is_allocator() {
|
|
info!("{} required by rlib and is an allocator", data.name());
|
|
self.inject_dependency_if(cnum, "an allocator",
|
|
&|data| data.needs_allocator());
|
|
found_required_allocator = found_required_allocator ||
|
|
data.dep_kind.get() == DepKind::Explicit;
|
|
}
|
|
});
|
|
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::CrateTypeProcMacro |
|
|
config::CrateTypeCdylib |
|
|
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 {
|
|
Symbol::intern(&self.sess.target.target.options.lib_allocation_crate)
|
|
} else {
|
|
Symbol::intern(&self.sess.target.target.options.exe_allocation_crate)
|
|
};
|
|
let dep_kind = DepKind::Implicit;
|
|
let (cnum, data) =
|
|
self.resolve_crate(&None, name, name, None, DUMMY_SP, PathKind::Crate, dep_kind);
|
|
|
|
// Sanity check the crate we loaded to ensure that it is indeed an
|
|
// 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_dependency_if(cnum, "an allocator",
|
|
&|data| data.needs_allocator());
|
|
}
|
|
|
|
fn inject_dependency_if(&self,
|
|
krate: CrateNum,
|
|
what: &str,
|
|
needs_dep: &Fn(&cstore::CrateMetadata) -> bool) {
|
|
// don't perform this validation if the session has errors, as one of
|
|
// those errors may indicate a circular dependency which could cause
|
|
// this to stack overflow.
|
|
if self.sess.has_errors() {
|
|
return
|
|
}
|
|
|
|
// Before we inject any dependencies, make sure we don't inject a
|
|
// circular dependency by validating that this crate doesn't
|
|
// transitively depend on any crates satisfying `needs_dep`.
|
|
for dep in self.cstore.crate_dependencies_in_rpo(krate) {
|
|
let data = self.cstore.get_crate_data(dep);
|
|
if needs_dep(&data) {
|
|
self.sess.err(&format!("the crate `{}` cannot depend \
|
|
on a crate that needs {}, but \
|
|
it depends on `{}`",
|
|
self.cstore.get_crate_data(krate).name(),
|
|
what,
|
|
data.name()));
|
|
}
|
|
}
|
|
|
|
// All crates satisfying `needs_dep` do not explicitly depend on the
|
|
// crate provided 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).
|
|
self.cstore.iter_crate_data(|cnum, data| {
|
|
if !needs_dep(data) {
|
|
return
|
|
}
|
|
|
|
info!("injecting a dep from {} to {}", cnum, krate);
|
|
data.cnum_map.borrow_mut().push(krate);
|
|
});
|
|
}
|
|
}
|
|
|
|
impl<'a> CrateLoader<'a> {
|
|
pub fn preprocess(&mut self, krate: &ast::Crate) {
|
|
for attr in &krate.attrs {
|
|
if attr.path == "link_args" {
|
|
if let Some(linkarg) = attr.value_str() {
|
|
self.cstore.add_used_link_args(&linkarg.as_str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn process_foreign_mod(&mut self, i: &ast::Item, fm: &ast::ForeignMod,
|
|
definitions: &Definitions) {
|
|
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.cstore.add_used_link_args(&linkarg.as_str());
|
|
}
|
|
}
|
|
|
|
// 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()).map(Symbol::as_str);
|
|
let kind = match kind.as_ref().map(|s| &s[..]) {
|
|
Some("static") => cstore::NativeStatic,
|
|
Some("static-nobundle") => cstore::NativeStaticNobundle,
|
|
Some("dylib") => cstore::NativeUnknown,
|
|
Some("framework") => cstore::NativeFramework,
|
|
Some(k) => {
|
|
struct_span_err!(self.sess, m.span, E0458,
|
|
"unknown kind: `{}`", k)
|
|
.span_label(m.span, &format!("unknown kind")).emit();
|
|
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 => {
|
|
struct_span_err!(self.sess, m.span, E0459,
|
|
"#[link(...)] specified without `name = \"foo\"`")
|
|
.span_label(m.span, &format!("missing `name` argument")).emit();
|
|
Symbol::intern("foo")
|
|
}
|
|
};
|
|
let cfg = items.iter().find(|k| {
|
|
k.check_name("cfg")
|
|
}).and_then(|a| a.meta_item_list());
|
|
let cfg = cfg.map(|list| {
|
|
list[0].meta_item().unwrap().clone()
|
|
});
|
|
let foreign_items = fm.items.iter()
|
|
.map(|it| definitions.opt_def_index(it.id).unwrap())
|
|
.collect();
|
|
let lib = NativeLibrary {
|
|
name: n,
|
|
kind: kind,
|
|
cfg: cfg,
|
|
foreign_items: foreign_items,
|
|
};
|
|
register_native_lib(self.sess, self.cstore, Some(m.span), lib);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> middle::cstore::CrateLoader for CrateLoader<'a> {
|
|
fn postprocess(&mut self, krate: &ast::Crate) {
|
|
// inject the sanitizer runtime before the allocator runtime because all
|
|
// sanitizers force the use of the `alloc_system` allocator
|
|
self.inject_sanitizer_runtime();
|
|
self.inject_profiler_runtime();
|
|
self.inject_allocator_crate();
|
|
self.inject_panic_runtime(krate);
|
|
|
|
if log_enabled!(log::LogLevel::Info) {
|
|
dump_crates(&self.cstore);
|
|
}
|
|
|
|
// Process libs passed on the command line
|
|
// First, check for errors
|
|
let mut renames = FxHashSet();
|
|
for &(ref name, ref new_name, _) in &self.sess.opts.libs {
|
|
if let &Some(ref new_name) = new_name {
|
|
if new_name.is_empty() {
|
|
self.sess.err(
|
|
&format!("an empty renaming target was specified for library `{}`",name));
|
|
} else if !self.cstore.get_used_libraries().borrow().iter()
|
|
.any(|lib| lib.name == name as &str) {
|
|
self.sess.err(&format!("renaming of the library `{}` was specified, \
|
|
however this crate contains no #[link(...)] \
|
|
attributes referencing this library.", name));
|
|
} else if renames.contains(name) {
|
|
self.sess.err(&format!("multiple renamings were specified for library `{}` .",
|
|
name));
|
|
} else {
|
|
renames.insert(name);
|
|
}
|
|
}
|
|
}
|
|
// Update kind and, optionally, the name of all native libaries
|
|
// (there may be more than one) with the specified name.
|
|
for &(ref name, ref new_name, kind) in &self.sess.opts.libs {
|
|
let mut found = false;
|
|
for lib in self.cstore.get_used_libraries().borrow_mut().iter_mut() {
|
|
if lib.name == name as &str {
|
|
let mut changed = false;
|
|
if let Some(k) = kind {
|
|
lib.kind = k;
|
|
changed = true;
|
|
}
|
|
if let &Some(ref new_name) = new_name {
|
|
lib.name = Symbol::intern(new_name);
|
|
changed = true;
|
|
}
|
|
if !changed {
|
|
self.sess.warn(&format!("redundant linker flag specified for library `{}`",
|
|
name));
|
|
}
|
|
|
|
found = true;
|
|
}
|
|
}
|
|
if !found {
|
|
// Add if not found
|
|
let new_name = new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
|
|
let lib = NativeLibrary {
|
|
name: Symbol::intern(new_name.unwrap_or(name)),
|
|
kind: if let Some(k) = kind { k } else { cstore::NativeUnknown },
|
|
cfg: None,
|
|
foreign_items: Vec::new(),
|
|
};
|
|
register_native_lib(self.sess, self.cstore, None, lib);
|
|
}
|
|
}
|
|
self.register_statically_included_foreign_items();
|
|
self.register_dllimport_foreign_items();
|
|
}
|
|
|
|
fn process_item(&mut self, item: &ast::Item, definitions: &Definitions) {
|
|
match item.node {
|
|
ast::ItemKind::ForeignMod(ref fm) => {
|
|
self.process_foreign_mod(item, fm, definitions)
|
|
},
|
|
ast::ItemKind::ExternCrate(_) => {
|
|
let info = self.extract_crate_info(item).unwrap();
|
|
let (cnum, ..) = self.resolve_crate(
|
|
&None, info.ident, info.name, None, item.span, PathKind::Crate, info.dep_kind,
|
|
);
|
|
|
|
let def_id = definitions.opt_local_def_id(item.id).unwrap();
|
|
let len = definitions.def_path(def_id.index).data.len();
|
|
|
|
let extern_crate =
|
|
ExternCrate { def_id: def_id, span: item.span, direct: true, path_len: len };
|
|
self.update_extern_crate(cnum, extern_crate, &mut FxHashSet());
|
|
self.cstore.add_extern_mod_stmt_cnum(info.id, cnum);
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|