1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Validates all used crates and extern libraries and loads their metadata
13 use cstore::{self, CStore, CrateSource, MetadataBlob};
14 use locator::{self, CratePaths};
15 use schema::{CrateRoot, Tracked};
17 use rustc::dep_graph::{DepNode, GlobalMetaDataKind};
18 use rustc::hir::def_id::{DefId, CrateNum, DefIndex, CRATE_DEF_INDEX};
19 use rustc::hir::svh::Svh;
20 use rustc::middle::cstore::DepKind;
21 use rustc::session::Session;
22 use rustc::session::config::{Sanitizer, self};
23 use rustc_back::PanicStrategy;
24 use rustc::session::search_paths::PathKind;
26 use rustc::middle::cstore::{CrateStore, validate_crate_name, ExternCrate};
27 use rustc::util::common::record_time;
28 use rustc::util::nodemap::FxHashSet;
29 use rustc::middle::cstore::NativeLibrary;
30 use rustc::hir::map::Definitions;
32 use std::cell::{RefCell, Cell};
34 use std::path::PathBuf;
41 use syntax::ext::base::SyntaxExtension;
42 use syntax::feature_gate::{self, GateIssue};
43 use syntax::symbol::Symbol;
44 use syntax_pos::{Span, DUMMY_SP};
48 pub dylib: Option<(PathBuf, PathKind)>,
49 pub rlib: Option<(PathBuf, PathKind)>,
50 pub rmeta: Option<(PathBuf, PathKind)>,
51 pub metadata: MetadataBlob,
54 pub struct CrateLoader<'a> {
55 pub sess: &'a Session,
57 next_crate_num: CrateNum,
58 local_crate_name: Symbol,
61 fn dump_crates(cstore: &CStore) {
62 info!("resolved crates:");
63 cstore.iter_crate_data(|_, data| {
64 info!(" name: {}", data.name());
65 info!(" cnum: {}", data.cnum);
66 info!(" hash: {}", data.hash());
67 info!(" reqd: {:?}", data.dep_kind.get());
68 let CrateSource { dylib, rlib, rmeta } = data.source.clone();
69 dylib.map(|dl| info!(" dylib: {}", dl.0.display()));
70 rlib.map(|rl| info!(" rlib: {}", rl.0.display()));
71 rmeta.map(|rl| info!(" rmeta: {}", rl.0.display()));
76 struct ExternCrateInfo {
83 fn register_native_lib(sess: &Session,
87 if lib.name.as_str().is_empty() {
90 struct_span_err!(sess, span, E0454,
91 "#[link(name = \"\")] given with empty name")
92 .span_label(span, "empty name given")
96 sess.err("empty library name given via `-l`");
101 let is_osx = sess.target.target.options.is_like_osx;
102 if lib.kind == cstore::NativeFramework && !is_osx {
103 let msg = "native frameworks are only available on macOS targets";
105 Some(span) => span_err!(sess, span, E0455, "{}", msg),
106 None => sess.err(msg),
109 if lib.cfg.is_some() && !sess.features.borrow().link_cfg {
110 feature_gate::emit_feature_err(&sess.parse_sess,
116 if lib.kind == cstore::NativeStaticNobundle && !sess.features.borrow().static_nobundle {
117 feature_gate::emit_feature_err(&sess.parse_sess,
121 "kind=\"static-nobundle\" is feature gated");
123 cstore.add_used_library(lib);
126 fn relevant_lib(sess: &Session, lib: &NativeLibrary) -> bool {
128 Some(ref cfg) => attr::cfg_matches(cfg, &sess.parse_sess, None),
133 // Extra info about a crate loaded for plugins or exported macros.
134 struct ExtensionCrate {
136 dylib: Option<PathBuf>,
141 Registered(Rc<cstore::CrateMetadata>),
145 impl Deref for PMDSource {
146 type Target = MetadataBlob;
148 fn deref(&self) -> &MetadataBlob {
150 PMDSource::Registered(ref cmd) => &cmd.blob,
151 PMDSource::Owned(ref lib) => &lib.metadata
161 impl<'a> CrateLoader<'a> {
162 pub fn new(sess: &'a Session, cstore: &'a CStore, local_crate_name: &str) -> Self {
166 next_crate_num: cstore.next_crate_num(),
167 local_crate_name: Symbol::intern(local_crate_name),
171 fn extract_crate_info(&self, i: &ast::Item) -> Option<ExternCrateInfo> {
173 ast::ItemKind::ExternCrate(ref path_opt) => {
174 debug!("resolving extern crate stmt. ident: {} path_opt: {:?}",
176 let name = match *path_opt {
178 validate_crate_name(Some(self.sess), &name.as_str(),
182 None => i.ident.name,
184 Some(ExternCrateInfo {
188 dep_kind: if attr::contains_name(&i.attrs, "no_link") {
189 DepKind::UnexportedMacrosOnly
199 fn existing_match(&self, name: Symbol, hash: Option<&Svh>, kind: PathKind)
200 -> Option<CrateNum> {
202 self.cstore.iter_crate_data(|cnum, data| {
203 if data.name != name { return }
206 Some(hash) if *hash == data.hash() => { ret = Some(cnum); return }
211 // When the hash is None we're dealing with a top-level dependency
212 // in which case we may have a specification on the command line for
213 // this library. Even though an upstream library may have loaded
214 // something of the same name, we have to make sure it was loaded
215 // from the exact same location as well.
217 // We're also sure to compare *paths*, not actual byte slices. The
218 // `source` stores paths which are normalized which may be different
219 // from the strings on the command line.
220 let source = self.cstore.used_crate_source(cnum);
221 if let Some(locs) = self.sess.opts.externs.get(&*name.as_str()) {
222 let found = locs.iter().any(|l| {
223 let l = fs::canonicalize(l).ok();
224 source.dylib.as_ref().map(|p| &p.0) == l.as_ref() ||
225 source.rlib.as_ref().map(|p| &p.0) == l.as_ref()
233 // Alright, so we've gotten this far which means that `data` has the
234 // right name, we don't have a hash, and we don't have a --extern
235 // pointing for ourselves. We're still not quite yet done because we
236 // have to make sure that this crate was found in the crate lookup
237 // path (this is a top-level dependency) as we don't want to
238 // implicitly load anything inside the dependency lookup path.
239 let prev_kind = source.dylib.as_ref().or(source.rlib.as_ref())
240 .or(source.rmeta.as_ref())
241 .expect("No sources for crate").1;
242 if ret.is_none() && (prev_kind == kind || prev_kind == PathKind::All) {
249 fn verify_no_symbol_conflicts(&self,
252 // Check for (potential) conflicts with the local crate
253 if self.local_crate_name == root.name &&
254 self.sess.local_crate_disambiguator() == root.disambiguator {
255 span_fatal!(self.sess, span, E0519,
256 "the current crate is indistinguishable from one of its \
257 dependencies: it has the same crate-name `{}` and was \
258 compiled with the same `-C metadata` arguments. This \
259 will result in symbol conflicts between the two.",
263 // Check for conflicts with any crate loaded so far
264 self.cstore.iter_crate_data(|_, other| {
265 if other.name() == root.name && // same crate-name
266 other.disambiguator() == root.disambiguator && // same crate-disambiguator
267 other.hash() != root.hash { // but different SVH
268 span_fatal!(self.sess, span, E0523,
269 "found two different crates with name `{}` that are \
270 not distinguished by differing `-C metadata`. This \
271 will result in symbol conflicts between the two.",
277 fn register_crate(&mut self,
278 root: &Option<CratePaths>,
284 -> (CrateNum, Rc<cstore::CrateMetadata>) {
285 info!("register crate `extern crate {} as {}`", name, ident);
286 let crate_root = lib.metadata.get_root();
287 self.verify_no_symbol_conflicts(span, &crate_root);
289 // Claim this crate number and cache it
290 let cnum = self.next_crate_num;
291 self.next_crate_num = CrateNum::from_u32(cnum.as_u32() + 1);
293 // Stash paths for top-most crate locally if necessary.
294 let crate_paths = if root.is_none() {
296 ident: ident.to_string(),
297 dylib: lib.dylib.clone().map(|p| p.0),
298 rlib: lib.rlib.clone().map(|p| p.0),
299 rmeta: lib.rmeta.clone().map(|p| p.0),
304 // Maintain a reference to the top most crate.
305 let root = if root.is_some() { root } else { &crate_paths };
307 let Library { dylib, rlib, rmeta, metadata } = lib;
309 let cnum_map = self.resolve_crate_deps(root, &crate_root, &metadata, cnum, span, dep_kind);
311 let def_path_table = record_time(&self.sess.perf_stats.decode_def_path_tables_time, || {
312 crate_root.def_path_table.decode(&metadata)
315 let exported_symbols = crate_root.exported_symbols
316 .map(|x| x.decode(&metadata).collect());
318 let mut cmeta = cstore::CrateMetadata {
320 extern_crate: Cell::new(None),
321 def_path_table: def_path_table,
322 exported_symbols: exported_symbols,
323 proc_macros: crate_root.macro_derive_registrar.map(|_| {
324 self.load_derive_macros(&crate_root, dylib.clone().map(|p| p.0), span)
328 cnum_map: RefCell::new(cnum_map),
330 codemap_import_info: RefCell::new(vec![]),
331 attribute_cache: RefCell::new([Vec::new(), Vec::new()]),
332 dep_kind: Cell::new(dep_kind),
333 source: cstore::CrateSource {
338 // Initialize this with an empty set. The field is populated below
339 // after we were able to deserialize its contents.
340 dllimport_foreign_items: Tracked::new(FxHashSet()),
343 let dllimports: Tracked<FxHashSet<_>> = cmeta
346 .map(|native_libraries| {
347 let native_libraries: Vec<_> = native_libraries.decode(&cmeta)
351 .filter(|lib| relevant_lib(self.sess, lib) &&
352 lib.kind == cstore::NativeLibraryKind::NativeUnknown)
353 .flat_map(|lib| lib.foreign_items.iter())
358 cmeta.dllimport_foreign_items = dllimports;
360 let cmeta = Rc::new(cmeta);
361 self.cstore.set_crate_data(cnum, cmeta.clone());
365 fn resolve_crate(&mut self,
366 root: &Option<CratePaths>,
372 mut dep_kind: DepKind)
373 -> (CrateNum, Rc<cstore::CrateMetadata>) {
374 info!("resolving crate `extern crate {} as {}`", name, ident);
375 let result = if let Some(cnum) = self.existing_match(name, hash, path_kind) {
376 LoadResult::Previous(cnum)
378 info!("falling back to a load");
379 let mut locate_ctxt = locator::Context {
384 hash: hash.map(|a| &*a),
385 filesearch: self.sess.target_filesearch(path_kind),
386 target: &self.sess.target.target,
387 triple: &self.sess.opts.target_triple,
389 rejected_via_hash: vec![],
390 rejected_via_triple: vec![],
391 rejected_via_kind: vec![],
392 rejected_via_version: vec![],
393 rejected_via_filename: vec![],
394 should_match_name: true,
395 is_proc_macro: Some(false),
396 metadata_loader: &*self.cstore.metadata_loader,
399 self.load(&mut locate_ctxt).or_else(|| {
400 dep_kind = DepKind::UnexportedMacrosOnly;
402 let mut proc_macro_locator = locator::Context {
403 target: &self.sess.host,
404 triple: config::host_triple(),
405 filesearch: self.sess.host_filesearch(path_kind),
406 rejected_via_hash: vec![],
407 rejected_via_triple: vec![],
408 rejected_via_kind: vec![],
409 rejected_via_version: vec![],
410 rejected_via_filename: vec![],
411 is_proc_macro: Some(true),
415 self.load(&mut proc_macro_locator)
416 }).unwrap_or_else(|| locate_ctxt.report_errs())
420 LoadResult::Previous(cnum) => {
421 let data = self.cstore.get_crate_data(cnum);
422 if data.root.macro_derive_registrar.is_some() {
423 dep_kind = DepKind::UnexportedMacrosOnly;
425 data.dep_kind.set(cmp::max(data.dep_kind.get(), dep_kind));
428 LoadResult::Loaded(library) => {
429 self.register_crate(root, ident, name, span, library, dep_kind)
434 fn load(&mut self, locate_ctxt: &mut locator::Context) -> Option<LoadResult> {
435 let library = match locate_ctxt.maybe_load_library_crate() {
440 // In the case that we're loading a crate, but not matching
441 // against a hash, we could load a crate which has the same hash
442 // as an already loaded crate. If this is the case prevent
443 // duplicates by just using the first crate.
445 // Note that we only do this for target triple crates, though, as we
446 // don't want to match a host crate against an equivalent target one
448 let root = library.metadata.get_root();
449 if locate_ctxt.triple == self.sess.opts.target_triple {
450 let mut result = LoadResult::Loaded(library);
451 self.cstore.iter_crate_data(|cnum, data| {
452 if data.name() == root.name && root.hash == data.hash() {
453 assert!(locate_ctxt.hash.is_none());
454 info!("load success, going to previous cnum: {}", cnum);
455 result = LoadResult::Previous(cnum);
460 Some(LoadResult::Loaded(library))
464 fn update_extern_crate(&mut self,
466 mut extern_crate: ExternCrate,
467 visited: &mut FxHashSet<(CrateNum, bool)>)
469 if !visited.insert((cnum, extern_crate.direct)) { return }
471 let cmeta = self.cstore.get_crate_data(cnum);
472 let old_extern_crate = cmeta.extern_crate.get();
475 // - something over nothing (tuple.0);
476 // - direct extern crate to indirect (tuple.1);
477 // - shorter paths to longer (tuple.2).
478 let new_rank = (true, extern_crate.direct, !extern_crate.path_len);
479 let old_rank = match old_extern_crate {
480 None => (false, false, !0),
481 Some(ref c) => (true, c.direct, !c.path_len),
484 if old_rank >= new_rank {
485 return; // no change needed
488 cmeta.extern_crate.set(Some(extern_crate));
489 // Propagate the extern crate info to dependencies.
490 extern_crate.direct = false;
491 for &dep_cnum in cmeta.cnum_map.borrow().iter() {
492 self.update_extern_crate(dep_cnum, extern_crate, visited);
496 // Go through the crate metadata and load any crates that it references
497 fn resolve_crate_deps(&mut self,
498 root: &Option<CratePaths>,
499 crate_root: &CrateRoot,
500 metadata: &MetadataBlob,
504 -> cstore::CrateNumMap {
505 debug!("resolving deps of external crate");
506 if crate_root.macro_derive_registrar.is_some() {
507 return cstore::CrateNumMap::new();
510 let dep_node = DepNode::GlobalMetaData(DefId { krate, index: CRATE_DEF_INDEX },
511 GlobalMetaDataKind::CrateDeps);
513 // The map from crate numbers in the crate we're resolving to local crate numbers.
514 // We map 0 and all other holes in the map to our parent crate. The "additional"
515 // self-dependencies should be harmless.
516 ::std::iter::once(krate).chain(crate_root.crate_deps
517 .get(&self.sess.dep_graph, dep_node)
520 debug!("resolving dep crate {} hash: `{}`", dep.name, dep.hash);
521 if dep.kind == DepKind::UnexportedMacrosOnly {
524 let dep_kind = match dep_kind {
525 DepKind::MacrosOnly => DepKind::MacrosOnly,
528 let (local_cnum, ..) = self.resolve_crate(
529 root, dep.name, dep.name, Some(&dep.hash), span, PathKind::Dependency, dep_kind,
535 fn read_extension_crate(&mut self, span: Span, info: &ExternCrateInfo) -> ExtensionCrate {
536 info!("read extension crate {} `extern crate {} as {}` dep_kind={:?}",
537 info.id, info.name, info.ident, info.dep_kind);
538 let target_triple = &self.sess.opts.target_triple[..];
539 let is_cross = target_triple != config::host_triple();
540 let mut target_only = false;
541 let mut locate_ctxt = locator::Context {
545 crate_name: info.name,
547 filesearch: self.sess.host_filesearch(PathKind::Crate),
548 target: &self.sess.host,
549 triple: config::host_triple(),
551 rejected_via_hash: vec![],
552 rejected_via_triple: vec![],
553 rejected_via_kind: vec![],
554 rejected_via_version: vec![],
555 rejected_via_filename: vec![],
556 should_match_name: true,
558 metadata_loader: &*self.cstore.metadata_loader,
560 let library = self.load(&mut locate_ctxt).or_else(|| {
564 // Try loading from target crates. This will abort later if we
565 // try to load a plugin registrar function,
568 locate_ctxt.target = &self.sess.target.target;
569 locate_ctxt.triple = target_triple;
570 locate_ctxt.filesearch = self.sess.target_filesearch(PathKind::Crate);
572 self.load(&mut locate_ctxt)
574 let library = match library {
576 None => locate_ctxt.report_errs(),
579 let (dylib, metadata) = match library {
580 LoadResult::Previous(cnum) => {
581 let data = self.cstore.get_crate_data(cnum);
582 (data.source.dylib.clone(), PMDSource::Registered(data))
584 LoadResult::Loaded(library) => {
585 let dylib = library.dylib.clone();
586 let metadata = PMDSource::Owned(library);
593 dylib: dylib.map(|p| p.0),
594 target_only: target_only,
598 /// Load custom derive macros.
600 /// Note that this is intentionally similar to how we load plugins today,
601 /// but also intentionally separate. Plugins are likely always going to be
602 /// implemented as dynamic libraries, but we have a possible future where
603 /// custom derive (and other macro-1.1 style features) are implemented via
604 /// executables and custom IPC.
605 fn load_derive_macros(&mut self, root: &CrateRoot, dylib: Option<PathBuf>, span: Span)
606 -> Vec<(ast::Name, Rc<SyntaxExtension>)> {
608 use proc_macro::TokenStream;
609 use proc_macro::__internal::Registry;
610 use rustc_back::dynamic_lib::DynamicLibrary;
611 use syntax_ext::deriving::custom::ProcMacroDerive;
612 use syntax_ext::proc_macro_impl::{AttrProcMacro, BangProcMacro};
614 let path = match dylib {
615 Some(dylib) => dylib,
616 None => span_bug!(span, "proc-macro crate not dylib"),
618 // Make sure the path contains a / or the linker will search for it.
619 let path = env::current_dir().unwrap().join(path);
620 let lib = match DynamicLibrary::open(Some(&path)) {
622 Err(err) => self.sess.span_fatal(span, &err),
625 let sym = self.sess.generate_derive_registrar_symbol(root.disambiguator,
626 root.macro_derive_registrar.unwrap());
627 let registrar = unsafe {
628 let sym = match lib.symbol(&sym) {
630 Err(err) => self.sess.span_fatal(span, &err),
632 mem::transmute::<*mut u8, fn(&mut Registry)>(sym)
635 struct MyRegistrar(Vec<(ast::Name, Rc<SyntaxExtension>)>);
637 impl Registry for MyRegistrar {
638 fn register_custom_derive(&mut self,
640 expand: fn(TokenStream) -> TokenStream,
641 attributes: &[&'static str]) {
642 let attrs = attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
643 let derive = ProcMacroDerive::new(expand, attrs.clone());
644 let derive = SyntaxExtension::ProcMacroDerive(Box::new(derive), attrs);
645 self.0.push((Symbol::intern(trait_name), Rc::new(derive)));
648 fn register_attr_proc_macro(&mut self,
650 expand: fn(TokenStream, TokenStream) -> TokenStream) {
651 let expand = SyntaxExtension::AttrProcMacro(
652 Box::new(AttrProcMacro { inner: expand })
654 self.0.push((Symbol::intern(name), Rc::new(expand)));
657 fn register_bang_proc_macro(&mut self,
659 expand: fn(TokenStream) -> TokenStream) {
660 let expand = SyntaxExtension::ProcMacro(
661 Box::new(BangProcMacro { inner: expand })
663 self.0.push((Symbol::intern(name), Rc::new(expand)));
667 let mut my_registrar = MyRegistrar(Vec::new());
668 registrar(&mut my_registrar);
670 // Intentionally leak the dynamic library. We can't ever unload it
671 // since the library can make things that will live arbitrarily long.
676 /// Look for a plugin registrar. Returns library path, crate
677 /// SVH and DefIndex of the registrar function.
678 pub fn find_plugin_registrar(&mut self,
681 -> Option<(PathBuf, Symbol, DefIndex)> {
682 let ekrate = self.read_extension_crate(span, &ExternCrateInfo {
683 name: Symbol::intern(name),
684 ident: Symbol::intern(name),
685 id: ast::DUMMY_NODE_ID,
686 dep_kind: DepKind::UnexportedMacrosOnly,
689 if ekrate.target_only {
690 // Need to abort before syntax expansion.
691 let message = format!("plugin `{}` is not available for triple `{}` \
694 config::host_triple(),
695 self.sess.opts.target_triple);
696 span_fatal!(self.sess, span, E0456, "{}", &message);
699 let root = ekrate.metadata.get_root();
700 match (ekrate.dylib.as_ref(), root.plugin_registrar_fn) {
701 (Some(dylib), Some(reg)) => {
702 Some((dylib.to_path_buf(), root.disambiguator, reg))
705 span_err!(self.sess, span, E0457,
706 "plugin `{}` only found in rlib format, but must be available \
709 // No need to abort because the loading code will just ignore this
717 fn get_foreign_items_of_kind(&self, kind: cstore::NativeLibraryKind) -> Vec<DefIndex> {
718 let mut items = vec![];
719 let libs = self.cstore.get_used_libraries();
720 for lib in libs.borrow().iter() {
721 if relevant_lib(self.sess, lib) && lib.kind == kind {
722 items.extend(&lib.foreign_items);
728 fn register_statically_included_foreign_items(&mut self) {
729 for id in self.get_foreign_items_of_kind(cstore::NativeStatic) {
730 self.cstore.add_statically_included_foreign_item(id);
732 for id in self.get_foreign_items_of_kind(cstore::NativeStaticNobundle) {
733 self.cstore.add_statically_included_foreign_item(id);
737 fn register_dllimport_foreign_items(&mut self) {
738 let mut dllimports = self.cstore.dllimport_foreign_items.borrow_mut();
739 for id in self.get_foreign_items_of_kind(cstore::NativeUnknown) {
740 dllimports.insert(id);
744 fn inject_panic_runtime(&mut self, krate: &ast::Crate) {
745 // If we're only compiling an rlib, then there's no need to select a
746 // panic runtime, so we just skip this section entirely.
747 let any_non_rlib = self.sess.crate_types.borrow().iter().any(|ct| {
748 *ct != config::CrateTypeRlib
751 info!("panic runtime injection skipped, only generating rlib");
755 // If we need a panic runtime, we try to find an existing one here. At
756 // the same time we perform some general validation of the DAG we've got
757 // going such as ensuring everything has a compatible panic strategy.
759 // The logic for finding the panic runtime here is pretty much the same
760 // as the allocator case with the only addition that the panic strategy
761 // compilation mode also comes into play.
762 let desired_strategy = self.sess.panic_strategy();
763 let mut runtime_found = false;
764 let mut needs_panic_runtime = attr::contains_name(&krate.attrs,
765 "needs_panic_runtime");
767 let dep_graph = &self.sess.dep_graph;
769 self.cstore.iter_crate_data(|cnum, data| {
770 needs_panic_runtime = needs_panic_runtime ||
771 data.needs_panic_runtime(dep_graph);
772 if data.is_panic_runtime(dep_graph) {
773 // Inject a dependency from all #![needs_panic_runtime] to this
774 // #![panic_runtime] crate.
775 self.inject_dependency_if(cnum, "a panic runtime",
776 &|data| data.needs_panic_runtime(dep_graph));
777 runtime_found = runtime_found || data.dep_kind.get() == DepKind::Explicit;
781 // If an explicitly linked and matching panic runtime was found, or if
782 // we just don't need one at all, then we're done here and there's
783 // nothing else to do.
784 if !needs_panic_runtime || runtime_found {
788 // By this point we know that we (a) need a panic runtime and (b) no
789 // panic runtime was explicitly linked. Here we just load an appropriate
790 // default runtime for our panic strategy and then inject the
793 // We may resolve to an already loaded crate (as the crate may not have
794 // been explicitly linked prior to this) and we may re-inject
795 // dependencies again, but both of those situations are fine.
797 // Also note that we have yet to perform validation of the crate graph
798 // in terms of everyone has a compatible panic runtime format, that's
799 // performed later as part of the `dependency_format` module.
800 let name = match desired_strategy {
801 PanicStrategy::Unwind => Symbol::intern("panic_unwind"),
802 PanicStrategy::Abort => Symbol::intern("panic_abort"),
804 info!("panic runtime not found -- loading {}", name);
806 let dep_kind = DepKind::Implicit;
808 self.resolve_crate(&None, name, name, None, DUMMY_SP, PathKind::Crate, dep_kind);
810 // Sanity check the loaded crate to ensure it is indeed a panic runtime
811 // and the panic strategy is indeed what we thought it was.
812 if !data.is_panic_runtime(dep_graph) {
813 self.sess.err(&format!("the crate `{}` is not a panic runtime",
816 if data.panic_strategy(dep_graph) != desired_strategy {
817 self.sess.err(&format!("the crate `{}` does not have the panic \
819 name, desired_strategy.desc()));
822 self.sess.injected_panic_runtime.set(Some(cnum));
823 self.inject_dependency_if(cnum, "a panic runtime",
824 &|data| data.needs_panic_runtime(dep_graph));
827 fn inject_sanitizer_runtime(&mut self) {
828 if let Some(ref sanitizer) = self.sess.opts.debugging_opts.sanitizer {
829 // Sanitizers can only be used on some tested platforms with
830 // executables linked to `std`
831 const ASAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu",
832 "x86_64-apple-darwin"];
833 const TSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu",
834 "x86_64-apple-darwin"];
835 const LSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu"];
836 const MSAN_SUPPORTED_TARGETS: &[&str] = &["x86_64-unknown-linux-gnu"];
838 let supported_targets = match *sanitizer {
839 Sanitizer::Address => ASAN_SUPPORTED_TARGETS,
840 Sanitizer::Thread => TSAN_SUPPORTED_TARGETS,
841 Sanitizer::Leak => LSAN_SUPPORTED_TARGETS,
842 Sanitizer::Memory => MSAN_SUPPORTED_TARGETS,
844 if !supported_targets.contains(&&*self.sess.target.target.llvm_target) {
845 self.sess.err(&format!("{:?}Sanitizer only works with the `{}` target",
847 supported_targets.join("` or `")
852 if !self.sess.crate_types.borrow().iter().all(|ct| {
855 config::CrateTypeExecutable => true,
856 // This crate will be compiled with the required
857 // instrumentation pass
858 config::CrateTypeRlib => false,
860 self.sess.err(&format!("Only executables and rlibs can be \
861 compiled with `-Z sanitizer`"));
869 let mut uses_std = false;
870 self.cstore.iter_crate_data(|_, data| {
871 if data.name == "std" {
877 let name = match *sanitizer {
878 Sanitizer::Address => "rustc_asan",
879 Sanitizer::Leak => "rustc_lsan",
880 Sanitizer::Memory => "rustc_msan",
881 Sanitizer::Thread => "rustc_tsan",
883 info!("loading sanitizer: {}", name);
885 let symbol = Symbol::intern(name);
886 let dep_kind = DepKind::Implicit;
888 self.resolve_crate(&None, symbol, symbol, None, DUMMY_SP,
889 PathKind::Crate, dep_kind);
891 // Sanity check the loaded crate to ensure it is indeed a sanitizer runtime
892 if !data.is_sanitizer_runtime(&self.sess.dep_graph) {
893 self.sess.err(&format!("the crate `{}` is not a sanitizer runtime",
900 fn inject_allocator_crate(&mut self) {
901 // Make sure that we actually need an allocator, if none of our
902 // dependencies need one then we definitely don't!
904 // Also, if one of our dependencies has an explicit allocator, then we
905 // also bail out as we don't need to implicitly inject one.
906 let mut needs_allocator = false;
907 let mut found_required_allocator = false;
908 let dep_graph = &self.sess.dep_graph;
909 self.cstore.iter_crate_data(|cnum, data| {
910 needs_allocator = needs_allocator || data.needs_allocator(dep_graph);
911 if data.is_allocator(dep_graph) {
912 info!("{} required by rlib and is an allocator", data.name());
913 self.inject_dependency_if(cnum, "an allocator",
914 &|data| data.needs_allocator(dep_graph));
915 found_required_allocator = found_required_allocator ||
916 data.dep_kind.get() == DepKind::Explicit;
919 if !needs_allocator || found_required_allocator { return }
921 // At this point we've determined that we need an allocator and no
922 // previous allocator has been activated. We look through our outputs of
923 // crate types to see what kind of allocator types we may need.
925 // The main special output type here is that rlibs do **not** need an
926 // allocator linked in (they're just object files), only final products
927 // (exes, dylibs, staticlibs) need allocators.
928 let mut need_lib_alloc = false;
929 let mut need_exe_alloc = false;
930 for ct in self.sess.crate_types.borrow().iter() {
932 config::CrateTypeExecutable => need_exe_alloc = true,
933 config::CrateTypeDylib |
934 config::CrateTypeProcMacro |
935 config::CrateTypeCdylib |
936 config::CrateTypeStaticlib => need_lib_alloc = true,
937 config::CrateTypeRlib => {}
940 if !need_lib_alloc && !need_exe_alloc { return }
942 // The default allocator crate comes from the custom target spec, and we
943 // choose between the standard library allocator or exe allocator. This
944 // distinction exists because the default allocator for binaries (where
945 // the world is Rust) is different than library (where the world is
946 // likely *not* Rust).
948 // If a library is being produced, but we're also flagged with `-C
949 // prefer-dynamic`, then we interpret this as a *Rust* dynamic library
950 // is being produced so we use the exe allocator instead.
952 // What this boils down to is:
954 // * Binaries use jemalloc
955 // * Staticlibs and Rust dylibs use system malloc
956 // * Rust dylibs used as dependencies to rust use jemalloc
957 let name = if need_lib_alloc && !self.sess.opts.cg.prefer_dynamic {
958 Symbol::intern(&self.sess.target.target.options.lib_allocation_crate)
960 Symbol::intern(&self.sess.target.target.options.exe_allocation_crate)
962 let dep_kind = DepKind::Implicit;
964 self.resolve_crate(&None, name, name, None, DUMMY_SP, PathKind::Crate, dep_kind);
966 // Sanity check the crate we loaded to ensure that it is indeed an
968 if !data.is_allocator(dep_graph) {
969 self.sess.err(&format!("the allocator crate `{}` is not tagged \
970 with #![allocator]", data.name()));
973 self.sess.injected_allocator.set(Some(cnum));
974 self.inject_dependency_if(cnum, "an allocator",
975 &|data| data.needs_allocator(dep_graph));
978 fn inject_dependency_if(&self,
981 needs_dep: &Fn(&cstore::CrateMetadata) -> bool) {
982 // don't perform this validation if the session has errors, as one of
983 // those errors may indicate a circular dependency which could cause
984 // this to stack overflow.
985 if self.sess.has_errors() {
989 // Before we inject any dependencies, make sure we don't inject a
990 // circular dependency by validating that this crate doesn't
991 // transitively depend on any crates satisfying `needs_dep`.
992 for dep in self.cstore.crate_dependencies_in_rpo(krate) {
993 let data = self.cstore.get_crate_data(dep);
994 if needs_dep(&data) {
995 self.sess.err(&format!("the crate `{}` cannot depend \
996 on a crate that needs {}, but \
998 self.cstore.get_crate_data(krate).name(),
1004 // All crates satisfying `needs_dep` do not explicitly depend on the
1005 // crate provided for this compile, but in order for this compilation to
1006 // be successfully linked we need to inject a dependency (to order the
1007 // crates on the command line correctly).
1008 self.cstore.iter_crate_data(|cnum, data| {
1009 if !needs_dep(data) {
1013 info!("injecting a dep from {} to {}", cnum, krate);
1014 data.cnum_map.borrow_mut().push(krate);
1019 impl<'a> CrateLoader<'a> {
1020 pub fn preprocess(&mut self, krate: &ast::Crate) {
1021 for attr in &krate.attrs {
1022 if attr.path == "link_args" {
1023 if let Some(linkarg) = attr.value_str() {
1024 self.cstore.add_used_link_args(&linkarg.as_str());
1030 fn process_foreign_mod(&mut self, i: &ast::Item, fm: &ast::ForeignMod,
1031 definitions: &Definitions) {
1032 if fm.abi == Abi::Rust || fm.abi == Abi::RustIntrinsic || fm.abi == Abi::PlatformIntrinsic {
1036 // First, add all of the custom #[link_args] attributes
1037 for m in i.attrs.iter().filter(|a| a.check_name("link_args")) {
1038 if let Some(linkarg) = m.value_str() {
1039 self.cstore.add_used_link_args(&linkarg.as_str());
1043 // Next, process all of the #[link(..)]-style arguments
1044 for m in i.attrs.iter().filter(|a| a.check_name("link")) {
1045 let items = match m.meta_item_list() {
1049 let kind = items.iter().find(|k| {
1050 k.check_name("kind")
1051 }).and_then(|a| a.value_str()).map(Symbol::as_str);
1052 let kind = match kind.as_ref().map(|s| &s[..]) {
1053 Some("static") => cstore::NativeStatic,
1054 Some("static-nobundle") => cstore::NativeStaticNobundle,
1055 Some("dylib") => cstore::NativeUnknown,
1056 Some("framework") => cstore::NativeFramework,
1058 struct_span_err!(self.sess, m.span, E0458,
1059 "unknown kind: `{}`", k)
1060 .span_label(m.span, "unknown kind").emit();
1061 cstore::NativeUnknown
1063 None => cstore::NativeUnknown
1065 let n = items.iter().find(|n| {
1066 n.check_name("name")
1067 }).and_then(|a| a.value_str());
1071 struct_span_err!(self.sess, m.span, E0459,
1072 "#[link(...)] specified without `name = \"foo\"`")
1073 .span_label(m.span, "missing `name` argument").emit();
1074 Symbol::intern("foo")
1077 let cfg = items.iter().find(|k| {
1079 }).and_then(|a| a.meta_item_list());
1080 let cfg = cfg.map(|list| {
1081 list[0].meta_item().unwrap().clone()
1083 let foreign_items = fm.items.iter()
1084 .map(|it| definitions.opt_def_index(it.id).unwrap())
1086 let lib = NativeLibrary {
1090 foreign_items: foreign_items,
1092 register_native_lib(self.sess, self.cstore, Some(m.span), lib);
1097 impl<'a> middle::cstore::CrateLoader for CrateLoader<'a> {
1098 fn postprocess(&mut self, krate: &ast::Crate) {
1099 // inject the sanitizer runtime before the allocator runtime because all
1100 // sanitizers force the use of the `alloc_system` allocator
1101 self.inject_sanitizer_runtime();
1102 self.inject_allocator_crate();
1103 self.inject_panic_runtime(krate);
1105 if log_enabled!(log::LogLevel::Info) {
1106 dump_crates(&self.cstore);
1109 // Process libs passed on the command line
1110 // First, check for errors
1111 let mut renames = FxHashSet();
1112 for &(ref name, ref new_name, _) in &self.sess.opts.libs {
1113 if let &Some(ref new_name) = new_name {
1114 if new_name.is_empty() {
1116 &format!("an empty renaming target was specified for library `{}`",name));
1117 } else if !self.cstore.get_used_libraries().borrow().iter()
1118 .any(|lib| lib.name == name as &str) {
1119 self.sess.err(&format!("renaming of the library `{}` was specified, \
1120 however this crate contains no #[link(...)] \
1121 attributes referencing this library.", name));
1122 } else if renames.contains(name) {
1123 self.sess.err(&format!("multiple renamings were specified for library `{}` .",
1126 renames.insert(name);
1130 // Update kind and, optionally, the name of all native libaries
1131 // (there may be more than one) with the specified name.
1132 for &(ref name, ref new_name, kind) in &self.sess.opts.libs {
1133 let mut found = false;
1134 for lib in self.cstore.get_used_libraries().borrow_mut().iter_mut() {
1135 if lib.name == name as &str {
1136 let mut changed = false;
1137 if let Some(k) = kind {
1141 if let &Some(ref new_name) = new_name {
1142 lib.name = Symbol::intern(new_name);
1146 self.sess.warn(&format!("redundant linker flag specified for library `{}`",
1155 let new_name = new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
1156 let lib = NativeLibrary {
1157 name: Symbol::intern(new_name.unwrap_or(name)),
1158 kind: if let Some(k) = kind { k } else { cstore::NativeUnknown },
1160 foreign_items: Vec::new(),
1162 register_native_lib(self.sess, self.cstore, None, lib);
1165 self.register_statically_included_foreign_items();
1166 self.register_dllimport_foreign_items();
1169 fn process_item(&mut self, item: &ast::Item, definitions: &Definitions) {
1171 ast::ItemKind::ForeignMod(ref fm) => {
1172 self.process_foreign_mod(item, fm, definitions)
1174 ast::ItemKind::ExternCrate(_) => {
1175 let info = self.extract_crate_info(item).unwrap();
1176 let (cnum, ..) = self.resolve_crate(
1177 &None, info.ident, info.name, None, item.span, PathKind::Crate, info.dep_kind,
1180 let def_id = definitions.opt_local_def_id(item.id).unwrap();
1181 let len = definitions.def_path(def_id.index).data.len();
1184 ExternCrate { def_id: def_id, span: item.span, direct: true, path_len: len };
1185 self.update_extern_crate(cnum, extern_crate, &mut FxHashSet());
1186 self.cstore.add_extern_mod_stmt_cnum(info.id, cnum);