91f057de35
Replace `_, _` with `..` in patterns This is how https://github.com/rust-lang/rust/issues/33627 looks in action. Looks especially nice in leftmost/rightmost positions `(first, ..)`/`(.., last)`. I haven't touched libsyntax intentionally because the feature is still unstable.
1234 lines
49 KiB
Rust
1234 lines
49 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 cstore::{self, CStore, CrateSource, MetadataBlob};
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use decoder;
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use loader::{self, CratePaths};
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use rustc::hir::def_id::DefIndex;
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use rustc::hir::svh::Svh;
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use rustc::dep_graph::{DepGraph, DepNode};
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use rustc::session::{config, Session};
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use rustc::session::config::PanicStrategy;
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use rustc::session::search_paths::PathKind;
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use rustc::middle::cstore::{CrateStore, validate_crate_name, ExternCrate};
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use rustc::util::nodemap::{FnvHashMap, FnvHashSet};
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use rustc::hir::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::Abi;
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use syntax::codemap;
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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::visit;
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use syntax_pos::{self, Span, mk_sp, Pos};
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use log;
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struct LocalCrateReader<'a> {
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sess: &'a Session,
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cstore: &'a CStore,
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creader: CrateReader<'a>,
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krate: &'a ast::Crate,
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definitions: &'a hir_map::Definitions,
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}
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pub struct CrateReader<'a> {
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sess: &'a Session,
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cstore: &'a CStore,
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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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local_crate_name: String,
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local_crate_config: ast::CrateConfig,
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}
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impl<'a> visit::Visitor for LocalCrateReader<'a> {
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fn visit_item(&mut self, a: &ast::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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#[derive(Debug)]
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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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fn register_native_lib(sess: &Session,
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cstore: &CStore,
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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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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 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) => {
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span_err!(sess, span, E0455,
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"{}", msg)
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}
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None => sess.err(msg),
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}
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}
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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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ident: String,
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name: String,
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span: Span,
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should_link: bool,
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}
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enum PMDSource {
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Registered(Rc<cstore::CrateMetadata>),
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Owned(loader::Library),
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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 lib) => lib.metadata.as_slice(),
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}
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}
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}
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enum LoadResult {
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Previous(ast::CrateNum),
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Loaded(loader::Library),
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}
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pub struct Macros {
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pub macro_rules: Vec<ast::MacroDef>,
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/// An array of pairs where the first element is the name of the custom
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/// derive (e.g. the trait being derived) and the second element is the
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/// index of the definition.
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pub custom_derive_registrar: Option<DefIndex>,
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pub svh: Svh,
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pub dylib: Option<PathBuf>,
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}
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impl<'a> CrateReader<'a> {
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pub fn new(sess: &'a Session,
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cstore: &'a CStore,
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local_crate_name: &str,
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local_crate_config: ast::CrateConfig)
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-> CrateReader<'a> {
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CrateReader {
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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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foreign_item_map: FnvHashMap(),
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local_crate_name: local_crate_name.to_owned(),
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local_crate_config: local_crate_config,
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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::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.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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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.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) {
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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 verify_no_symbol_conflicts(&self,
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span: Span,
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metadata: &MetadataBlob) {
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let disambiguator = decoder::get_crate_disambiguator(metadata.as_slice());
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let crate_name = decoder::get_crate_name(metadata.as_slice());
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// Check for (potential) conflicts with the local crate
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if self.local_crate_name == crate_name &&
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self.sess.local_crate_disambiguator() == 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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crate_name)
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}
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let svh = decoder::get_crate_hash(metadata.as_slice());
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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() == crate_name && // same crate-name
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other.disambiguator() == disambiguator && // same crate-disambiguator
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other.hash() != svh { // 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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crate_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: &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::CrateMetadata>,
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cstore::CrateSource) {
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info!("register crate `extern crate {} as {}`", name, ident);
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self.verify_no_symbol_conflicts(span, &lib.metadata);
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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(), cnum, span);
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let staged_api = self.is_staged_api(metadata.as_slice());
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let cmeta = Rc::new(cstore::CrateMetadata {
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name: name.to_string(),
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extern_crate: Cell::new(None),
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index: decoder::load_index(metadata.as_slice()),
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xref_index: decoder::load_xrefs(metadata.as_slice()),
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key_map: decoder::load_key_map(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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staged_api: staged_api,
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explicitly_linked: Cell::new(explicitly_linked),
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});
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if decoder::get_derive_registrar_fn(cmeta.data.as_slice()).is_some() {
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self.sess.span_err(span, "crates of the `rustc-macro` crate type \
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cannot be linked at runtime");
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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.cstore.set_crate_data(cnum, cmeta.clone());
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self.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() == "stable" || attr.name() == "unstable" {
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return true
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}
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}
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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::CrateMetadata>, cstore::CrateSource) {
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info!("resolving crate `extern crate {} as {}`", name, ident);
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let result = match self.existing_match(name, hash, kind) {
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Some(cnum) => LoadResult::Previous(cnum),
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None => {
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info!("falling back to a load");
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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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rejected_via_version: vec!(),
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should_match_name: true,
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};
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match self.load(&mut load_ctxt) {
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Some(result) => result,
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None => load_ctxt.report_load_errs(),
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}
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}
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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 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.cstore.used_crate_source(cnum))
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}
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LoadResult::Loaded(library) => {
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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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}
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}
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fn load(&mut self, loader: &mut loader::Context) -> Option<LoadResult> {
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let library = match loader.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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if loader.triple == self.sess.opts.target_triple {
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let meta_hash = decoder::get_crate_hash(library.metadata.as_slice());
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let meta_name = decoder::get_crate_name(library.metadata.as_slice())
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.to_string();
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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() == meta_name && meta_hash == data.hash() {
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assert!(loader.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: ast::CrateNum,
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mut extern_crate: ExternCrate,
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visited: &mut FnvHashSet<(ast::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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|
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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],
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krate: ast::CrateNum,
|
|
span: Span)
|
|
-> cstore::CrateNumMap {
|
|
debug!("resolving deps of external crate");
|
|
// The map from crate numbers in the crate we're resolving to local crate
|
|
// numbers
|
|
let map: FnvHashMap<_, _> = decoder::get_crate_deps(cdata).iter().map(|dep| {
|
|
debug!("resolving dep crate {} hash: `{}`", dep.name, dep.hash);
|
|
let (local_cnum, ..) = self.resolve_crate(root,
|
|
&dep.name,
|
|
&dep.name,
|
|
Some(&dep.hash),
|
|
span,
|
|
PathKind::Dependency,
|
|
dep.explicitly_linked);
|
|
(dep.cnum, local_cnum)
|
|
}).collect();
|
|
|
|
let max_cnum = map.values().cloned().max().unwrap_or(0);
|
|
|
|
// we map 0 and all other holes in the map to our parent crate. The "additional"
|
|
// self-dependencies should be harmless.
|
|
(0..max_cnum+1).map(|cnum| map.get(&cnum).cloned().unwrap_or(krate)).collect()
|
|
}
|
|
|
|
fn read_extension_crate(&mut self, span: Span, info: &CrateInfo) -> ExtensionCrate {
|
|
info!("read extension crate {} `extern crate {} as {}` linked={}",
|
|
info.id, info.name, info.ident, info.should_link);
|
|
let target_triple = &self.sess.opts.target_triple[..];
|
|
let is_cross = target_triple != config::host_triple();
|
|
let mut should_link = info.should_link && !is_cross;
|
|
let mut target_only = false;
|
|
let ident = info.ident.clone();
|
|
let name = info.name.clone();
|
|
let mut load_ctxt = loader::Context {
|
|
sess: self.sess,
|
|
span: span,
|
|
ident: &ident[..],
|
|
crate_name: &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!(),
|
|
should_match_name: true,
|
|
};
|
|
let library = self.load(&mut load_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;
|
|
should_link = info.should_link;
|
|
|
|
load_ctxt.target = &self.sess.target.target;
|
|
load_ctxt.triple = target_triple;
|
|
load_ctxt.filesearch = self.sess.target_filesearch(PathKind::Crate);
|
|
|
|
self.load(&mut load_ctxt)
|
|
});
|
|
let library = match library {
|
|
Some(l) => l,
|
|
None => load_ctxt.report_load_errs(),
|
|
};
|
|
|
|
let (dylib, metadata) = match library {
|
|
LoadResult::Previous(cnum) => {
|
|
let dylib = self.cstore.opt_used_crate_source(cnum).unwrap().dylib;
|
|
let data = self.cstore.get_crate_data(cnum);
|
|
(dylib, 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,
|
|
name: info.name.to_string(),
|
|
ident: info.ident.to_string(),
|
|
span: span,
|
|
should_link: should_link,
|
|
}
|
|
}
|
|
|
|
pub fn read_macros(&mut self, item: &ast::Item) -> Macros {
|
|
let ci = self.extract_crate_info(item).unwrap();
|
|
let ekrate = self.read_extension_crate(item.span, &ci);
|
|
|
|
let source_name = format!("<{} macros>", item.ident);
|
|
let mut ret = Macros {
|
|
macro_rules: Vec::new(),
|
|
custom_derive_registrar: None,
|
|
svh: decoder::get_crate_hash(ekrate.metadata.as_slice()),
|
|
dylib: None,
|
|
};
|
|
decoder::each_exported_macro(ekrate.metadata.as_slice(),
|
|
|name, attrs, span, body| {
|
|
// NB: Don't use parse::parse_tts_from_source_str because it parses with
|
|
// quote_depth > 0.
|
|
let mut p = parse::new_parser_from_source_str(&self.sess.parse_sess,
|
|
self.local_crate_config.clone(),
|
|
source_name.clone(),
|
|
body);
|
|
let lo = p.span.lo;
|
|
let body = match p.parse_all_token_trees() {
|
|
Ok(body) => body,
|
|
Err(mut err) => {
|
|
err.emit();
|
|
self.sess.abort_if_errors();
|
|
unreachable!();
|
|
}
|
|
};
|
|
let local_span = mk_sp(lo, p.last_span.hi);
|
|
|
|
// Mark the attrs as used
|
|
for attr in &attrs {
|
|
attr::mark_used(attr);
|
|
}
|
|
|
|
ret.macro_rules.push(ast::MacroDef {
|
|
ident: ast::Ident::with_empty_ctxt(name),
|
|
attrs: attrs,
|
|
id: ast::DUMMY_NODE_ID,
|
|
span: local_span,
|
|
imported_from: Some(item.ident),
|
|
// overridden in plugin/load.rs
|
|
export: false,
|
|
use_locally: false,
|
|
allow_internal_unstable: false,
|
|
|
|
body: body,
|
|
});
|
|
self.sess.imported_macro_spans.borrow_mut()
|
|
.insert(local_span, (name.as_str().to_string(), span));
|
|
true
|
|
});
|
|
|
|
match decoder::get_derive_registrar_fn(ekrate.metadata.as_slice()) {
|
|
Some(id) => ret.custom_derive_registrar = Some(id),
|
|
|
|
// If this crate is not a rustc-macro crate then we might be able to
|
|
// register it with the local crate store to prevent loading the
|
|
// metadata twice.
|
|
//
|
|
// If it's a rustc-macro crate, though, then we definitely don't
|
|
// want to register it with the local crate store as we're just
|
|
// going to use it as we would a plugin.
|
|
None => {
|
|
ekrate.register(self);
|
|
return ret
|
|
}
|
|
}
|
|
|
|
self.cstore.add_used_for_derive_macros(item);
|
|
ret.dylib = ekrate.dylib.clone();
|
|
if ret.dylib.is_none() {
|
|
span_bug!(item.span, "rustc-macro crate not dylib");
|
|
}
|
|
|
|
if ekrate.target_only {
|
|
let message = format!("rustc-macro crate is not available for \
|
|
triple `{}` (only found {})",
|
|
config::host_triple(),
|
|
self.sess.opts.target_triple);
|
|
self.sess.span_fatal(item.span, &message);
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
/// 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, Svh, DefIndex)> {
|
|
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);
|
|
span_fatal!(self.sess, span, E0456, "{}", &message[..]);
|
|
}
|
|
|
|
let svh = decoder::get_crate_hash(ekrate.metadata.as_slice());
|
|
let registrar =
|
|
decoder::get_plugin_registrar_fn(ekrate.metadata.as_slice());
|
|
|
|
match (ekrate.dylib.as_ref(), registrar) {
|
|
(Some(dylib), Some(reg)) => {
|
|
Some((dylib.to_path_buf(), svh, 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 register_statically_included_foreign_items(&mut self) {
|
|
let libs = self.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.cstore.add_statically_included_foreign_item(*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.opts.cg.panic.clone();
|
|
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.explicitly_linked.get();
|
|
}
|
|
});
|
|
|
|
// 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 => "panic_unwind",
|
|
PanicStrategy::Abort => "panic_abort",
|
|
};
|
|
info!("panic runtime not found -- loading {}", name);
|
|
|
|
let (cnum, data, _) = self.resolve_crate(&None, name, name, None,
|
|
syntax_pos::DUMMY_SP,
|
|
PathKind::Crate, false);
|
|
|
|
// 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_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.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::CrateTypeRustcMacro |
|
|
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 {
|
|
&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,
|
|
syntax_pos::DUMMY_SP,
|
|
PathKind::Crate, false);
|
|
|
|
// 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: ast::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 ExtensionCrate {
|
|
fn register(self, creader: &mut CrateReader) {
|
|
if !self.should_link {
|
|
return
|
|
}
|
|
|
|
let library = match self.metadata {
|
|
PMDSource::Owned(lib) => lib,
|
|
PMDSource::Registered(_) => return,
|
|
};
|
|
|
|
// Register crate now to avoid double-reading metadata
|
|
creader.register_crate(&None,
|
|
&self.ident,
|
|
&self.name,
|
|
self.span,
|
|
library,
|
|
true);
|
|
}
|
|
}
|
|
|
|
impl<'a> LocalCrateReader<'a> {
|
|
fn new(sess: &'a Session,
|
|
cstore: &'a CStore,
|
|
defs: &'a hir_map::Definitions,
|
|
krate: &'a ast::Crate,
|
|
local_crate_name: &str)
|
|
-> LocalCrateReader<'a> {
|
|
LocalCrateReader {
|
|
sess: sess,
|
|
cstore: cstore,
|
|
creader: CrateReader::new(sess, cstore, local_crate_name, krate.config.clone()),
|
|
krate: krate,
|
|
definitions: defs,
|
|
}
|
|
}
|
|
|
|
// Traverses an AST, reading all the information about use'd crates and
|
|
// extern libraries necessary for later resolving, typechecking, linking,
|
|
// etc.
|
|
fn read_crates(&mut self, dep_graph: &DepGraph) {
|
|
let _task = dep_graph.in_task(DepNode::CrateReader);
|
|
|
|
self.process_crate(self.krate);
|
|
visit::walk_crate(self, self.krate);
|
|
self.creader.inject_allocator_crate();
|
|
self.creader.inject_panic_runtime(self.krate);
|
|
|
|
if log_enabled!(log::INFO) {
|
|
dump_crates(&self.cstore);
|
|
}
|
|
|
|
for &(ref name, kind) in &self.sess.opts.libs {
|
|
register_native_lib(self.sess, self.cstore, None, name.clone(), kind);
|
|
}
|
|
self.creader.register_statically_included_foreign_items();
|
|
}
|
|
|
|
fn process_crate(&self, c: &ast::Crate) {
|
|
for a in c.attrs.iter().filter(|m| m.name() == "link_args") {
|
|
if let Some(ref linkarg) = a.value_str() {
|
|
self.cstore.add_used_link_args(&linkarg);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn process_item(&mut self, i: &ast::Item) {
|
|
match i.node {
|
|
ast::ItemKind::ExternCrate(_) => {
|
|
// If this `extern crate` item has `#[macro_use]` then we can
|
|
// safely skip it. These annotations were processed during macro
|
|
// expansion and are already loaded (if necessary) into our
|
|
// crate store.
|
|
//
|
|
// Note that it's important we *don't* fall through below as
|
|
// some `#[macro_use]` crate are explicitly not linked (e.g.
|
|
// macro crates) so we want to ensure we avoid `resolve_crate`
|
|
// with those.
|
|
if attr::contains_name(&i.attrs, "macro_use") {
|
|
if self.cstore.was_used_for_derive_macros(i) {
|
|
return
|
|
}
|
|
}
|
|
|
|
if let Some(info) = self.creader.extract_crate_info(i) {
|
|
if !info.should_link {
|
|
return;
|
|
}
|
|
let (cnum, ..) = self.creader.resolve_crate(&None,
|
|
&info.ident,
|
|
&info.name,
|
|
None,
|
|
i.span,
|
|
PathKind::Crate,
|
|
true);
|
|
|
|
let def_id = self.definitions.opt_local_def_id(i.id).unwrap();
|
|
let len = self.definitions.def_path(def_id.index).data.len();
|
|
|
|
self.creader.update_extern_crate(cnum,
|
|
ExternCrate {
|
|
def_id: def_id,
|
|
span: i.span,
|
|
direct: true,
|
|
path_len: len,
|
|
},
|
|
&mut FnvHashSet());
|
|
self.cstore.add_extern_mod_stmt_cnum(info.id, cnum);
|
|
}
|
|
}
|
|
ast::ItemKind::ForeignMod(ref fm) => self.process_foreign_mod(i, fm),
|
|
_ => { }
|
|
}
|
|
}
|
|
|
|
fn process_foreign_mod(&mut self, i: &ast::Item, fm: &ast::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.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) => {
|
|
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();
|
|
InternedString::new("foo")
|
|
}
|
|
};
|
|
register_native_lib(self.sess, self.cstore, 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));
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Traverses an AST, reading all the information about use'd crates and extern
|
|
/// libraries necessary for later resolving, typechecking, linking, etc.
|
|
pub fn read_local_crates(sess: & Session,
|
|
cstore: & CStore,
|
|
defs: & hir_map::Definitions,
|
|
krate: & ast::Crate,
|
|
local_crate_name: &str,
|
|
dep_graph: &DepGraph) {
|
|
LocalCrateReader::new(sess, cstore, defs, krate, local_crate_name).read_crates(dep_graph)
|
|
}
|
|
|
|
/// 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 syntax_pos::FileMap {
|
|
name,
|
|
abs_path,
|
|
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,
|
|
abs_path,
|
|
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: &syntax_pos::FileMap,
|
|
fm2: &syntax_pos::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
|
|
}
|
|
}
|