rustc: Migrate CStore::native_libraries to a query

Author: alexcrichton

src/librustc/dep_graph/dep_node.rs

@@ -532,6 +532,7 @@ define_dep_nodes!( <'tcx>
     [] IsNoBuiltins(CrateNum),
     [] ImplDefaultness(DefId),
     [] ExportedSymbols(CrateNum),
+    [] NativeLibraries(CrateNum),
 );
 
 trait DepNodeParams<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> : fmt::Debug {

src/librustc/middle/cstore.rs

@@ -257,7 +257,6 @@ pub trait CrateStore {
     fn crate_disambiguator(&self, cnum: CrateNum) -> Symbol;
     fn plugin_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>;
     fn derive_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>;
-    fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>;
 
     // resolve
     fn def_key(&self, def: DefId) -> DefKey;
@@ -364,8 +363,6 @@ impl CrateStore for DummyCrateStore {
         { bug!("plugin_registrar_fn") }
     fn derive_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>
         { bug!("derive_registrar_fn") }
-    fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>
-        { bug!("native_libraries") }
 
     // resolve
     fn def_key(&self, def: DefId) -> DefKey { bug!("def_key") }

src/librustc/ty/maps.rs

@@ -15,7 +15,7 @@ use hir::def::Def;
 use hir;
 use lint;
 use middle::const_val;
-use middle::cstore::{ExternCrate, LinkagePreference};
+use middle::cstore::{ExternCrate, LinkagePreference, NativeLibrary};
 use middle::privacy::AccessLevels;
 use middle::region::RegionMaps;
 use mir;
@@ -565,6 +565,12 @@ impl<'tcx> QueryDescription for queries::exported_symbols<'tcx> {
     }
 }
 
+impl<'tcx> QueryDescription for queries::native_libraries<'tcx> {
+    fn describe(_tcx: TyCtxt, _: CrateNum) -> String {
+        format!("looking up the native libraries of a linked crate")
+    }
+}
+
 // If enabled, send a message to the profile-queries thread
 macro_rules! profq_msg {
     ($tcx:expr, $msg:expr) => {
@@ -1139,6 +1145,7 @@ define_maps! { <'tcx>
 
     [] impl_defaultness: ImplDefaultness(DefId) -> hir::Defaultness,
     [] exported_symbols: ExportedSymbols(CrateNum) -> Rc<Vec<DefId>>,
+    [] native_libraries: NativeLibraries(CrateNum) -> Rc<Vec<NativeLibrary>>,
 }
 
 fn type_param_predicates<'tcx>((item_id, param_id): (DefId, DefId)) -> DepConstructor<'tcx> {

src/librustc_metadata/cstore_impl.rs

@@ -161,6 +161,7 @@ provide! { <'tcx> tcx, def_id, cdata,
     is_no_builtins => { cdata.is_no_builtins(&tcx.dep_graph) }
     impl_defaultness => { cdata.get_impl_defaultness(def_id.index) }
     exported_symbols => { Rc::new(cdata.get_exported_symbols(&tcx.dep_graph)) }
+    native_libraries => { Rc::new(cdata.get_native_libraries(&tcx.dep_graph)) }
 }
 
 pub fn provide_local<'tcx>(providers: &mut Providers<'tcx>) {
@@ -295,11 +296,6 @@ impl CrateStore for cstore::CStore {
         })
     }
 
-    fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>
-    {
-        self.get_crate_data(cnum).get_native_libraries(&self.dep_graph)
-    }
-
     /// Returns the `DefKey` for a given `DefId`. This indicates the
     /// parent `DefId` as well as some idea of what kind of data the
     /// `DefId` refers to.

src/librustc_trans/back/link.rs

@@ -613,7 +613,7 @@ fn link_staticlib(sess: &Session,
 
     let res = each_linked_rlib(sess, &mut |cnum, path| {
         let name = sess.cstore.crate_name(cnum);
-        let native_libs = sess.cstore.native_libraries(cnum);
+        let native_libs = &trans.crate_info.native_libraries[&cnum];
 
         // Here when we include the rlib into our staticlib we need to make a
         // decision whether to include the extra object files along the way.
@@ -637,7 +637,7 @@ fn link_staticlib(sess: &Session,
                     sess.lto() && !ignored_for_lto(&trans.crate_info, cnum),
                     skip_object_files).unwrap();
 
-        all_native_libs.extend(sess.cstore.native_libraries(cnum));
+        all_native_libs.extend(trans.crate_info.native_libraries[&cnum].iter().cloned());
     });
     if let Err(e) = res {
         sess.fatal(&e);
@@ -964,7 +964,7 @@ fn link_args(cmd: &mut Linker,
     // on other dylibs (e.g. other native deps).
     add_local_native_libraries(cmd, sess);
     add_upstream_rust_crates(cmd, sess, trans, crate_type, tmpdir);
-    add_upstream_native_libraries(cmd, sess, crate_type);
+    add_upstream_native_libraries(cmd, sess, trans, crate_type);
 
     // Tell the linker what we're doing.
     if crate_type != config::CrateTypeExecutable {
@@ -1201,7 +1201,7 @@ fn add_upstream_rust_crates(cmd: &mut Linker,
         // See the comment above in `link_staticlib` and `link_rlib` for why if
         // there's a static library that's not relevant we skip all object
         // files.
-        let native_libs = sess.cstore.native_libraries(cnum);
+        let native_libs = &trans.crate_info.native_libraries[&cnum];
         let skip_native = native_libs.iter().any(|lib| {
             lib.kind == NativeLibraryKind::NativeStatic && !relevant_lib(sess, lib)
         });
@@ -1314,7 +1314,10 @@ fn add_upstream_rust_crates(cmd: &mut Linker,
 // generic function calls a native function, then the generic function must
 // be instantiated in the target crate, meaning that the native symbol must
 // also be resolved in the target crate.
-fn add_upstream_native_libraries(cmd: &mut Linker, sess: &Session, crate_type: config::CrateType) {
+fn add_upstream_native_libraries(cmd: &mut Linker,
+                                 sess: &Session,
+                                 trans: &CrateTranslation,
+                                 crate_type: config::CrateType) {
     // Be sure to use a topological sorting of crates because there may be
     // interdependencies between native libraries. When passing -nodefaultlibs,
     // for example, almost all native libraries depend on libc, so we have to
@@ -1329,7 +1332,7 @@ fn add_upstream_native_libraries(cmd: &mut Linker, sess: &Session, crate_type: c
 
     let crates = sess.cstore.used_crates(LinkagePreference::RequireStatic);
     for (cnum, _) in crates {
-        for lib in sess.cstore.native_libraries(cnum) {
+        for lib in trans.crate_info.native_libraries[&cnum].iter() {
             if !relevant_lib(sess, &lib) {
                 continue
             }

src/librustc_trans/base.rs

@@ -1515,9 +1515,11 @@ impl CrateInfo {
             profiler_runtime: None,
             sanitizer_runtime: None,
             is_no_builtins: FxHashSet(),
+            native_libraries: FxHashMap(),
         };
 
         for cnum in tcx.sess.cstore.crates() {
+            info.native_libraries.insert(cnum, tcx.native_libraries(cnum));
             if tcx.is_panic_runtime(cnum) {
                 info.panic_runtime = Some(cnum);
             }

src/librustc_trans/lib.rs

@@ -65,8 +65,12 @@ pub use back::symbol_names::provide;
 
 pub use metadata::LlvmMetadataLoader;
 pub use llvm_util::{init, target_features, print_version, print_passes, print, enable_llvm_debug};
+
+use std::rc::Rc;
+
 use rustc::hir::def_id::CrateNum;
-use rustc::util::nodemap::FxHashSet;
+use rustc::util::nodemap::{FxHashSet, FxHashMap};
+use rustc::middle::cstore::NativeLibrary;
 
 pub mod back {
     mod archive;
@@ -229,6 +233,7 @@ pub struct CrateInfo {
     profiler_runtime: Option<CrateNum>,
     sanitizer_runtime: Option<CrateNum>,
     is_no_builtins: FxHashSet<CrateNum>,
+    native_libraries: FxHashMap<CrateNum, Rc<Vec<NativeLibrary>>>,
 }
 
 __build_diagnostic_array! { librustc_trans, DIAGNOSTICS }