on-demand dylib dependency formats

src/librustc/middle/cstore.rs

@@ -247,8 +247,6 @@ pub trait CrateStore {
     fn is_statically_included_foreign_item(&self, def_id: DefId) -> bool;
 
     // crate metadata
-    fn dylib_dependency_formats(&self, cnum: CrateNum)
-                                    -> Vec<(CrateNum, LinkagePreference)>;
     fn dep_kind(&self, cnum: CrateNum) -> DepKind;
     fn export_macros(&self, cnum: CrateNum);
     fn lang_items(&self, cnum: CrateNum) -> Vec<(DefIndex, usize)>;
@@ -367,9 +365,6 @@ impl CrateStore for DummyCrateStore {
     fn is_statically_included_foreign_item(&self, def_id: DefId) -> bool { false }
 
     // crate metadata
-    fn dylib_dependency_formats(&self, cnum: CrateNum)
-                                    -> Vec<(CrateNum, LinkagePreference)>
-        { bug!("dylib_dependency_formats") }
     fn lang_items(&self, cnum: CrateNum) -> Vec<(DefIndex, usize)>
         { bug!("lang_items") }
     fn missing_lang_items(&self, cnum: CrateNum) -> Vec<lang_items::LangItem>

src/librustc/middle/dependency_format.rs

@@ -65,6 +65,7 @@ use hir::def_id::CrateNum;
 
 use session;
 use session::config;
+use ty::TyCtxt;
 use middle::cstore::DepKind;
 use middle::cstore::LinkagePreference::{self, RequireStatic, RequireDynamic};
 use util::nodemap::FxHashMap;
@@ -91,18 +92,22 @@ pub enum Linkage {
     Dynamic,
 }
 
-pub fn calculate(sess: &session::Session) {
+pub fn calculate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
+    let sess = &tcx.sess;
     let mut fmts = sess.dependency_formats.borrow_mut();
     for &ty in sess.crate_types.borrow().iter() {
-        let linkage = calculate_type(sess, ty);
+        let linkage = calculate_type(tcx, ty);
         verify_ok(sess, &linkage);
         fmts.insert(ty, linkage);
     }
     sess.abort_if_errors();
 }
 
-fn calculate_type(sess: &session::Session,
-                  ty: config::CrateType) -> DependencyList {
+fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
+                            ty: config::CrateType) -> DependencyList {
+
+    let sess = &tcx.sess;
+
     if !sess.opts.output_types.should_trans() {
         return Vec::new();
     }
@@ -167,8 +172,8 @@ fn calculate_type(sess: &session::Session,
         if src.dylib.is_some() {
             info!("adding dylib: {}", name);
             add_library(sess, cnum, RequireDynamic, &mut formats);
-            let deps = sess.cstore.dylib_dependency_formats(cnum);
-            for &(depnum, style) in &deps {
+            let deps = tcx.dylib_dependency_formats(cnum);
+            for &(depnum, style) in deps.iter() {
                 info!("adding {:?}: {}", style,
                       sess.cstore.crate_name(depnum));
                 add_library(sess, depnum, style, &mut formats);

src/librustc/ty/maps.rs

@@ -13,6 +13,7 @@ use hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId, LOCAL_CRATE};
 use hir::def::Def;
 use hir;
 use middle::const_val;
+use middle::cstore::LinkagePreference;
 use middle::privacy::AccessLevels;
 use middle::region::RegionMaps;
 use mir;
@@ -482,6 +483,12 @@ impl<'tcx> QueryDescription for queries::is_const_fn<'tcx> {
     }
 }
 
+impl<'tcx> QueryDescription for queries::dylib_dependency_formats<'tcx> {
+    fn describe(_: TyCtxt, _: CrateNum) -> String {
+        "dylib dependency formats of crate".to_string()
+    }
+}
+
 macro_rules! define_maps {
     (<$tcx:tt>
      $($(#[$attr:meta])*
@@ -938,6 +945,9 @@ define_maps! { <'tcx>
     [] needs_drop_raw: needs_drop_dep_node(ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool,
     [] layout_raw: layout_dep_node(ty::ParamEnvAnd<'tcx, Ty<'tcx>>)
                                   -> Result<&'tcx Layout, LayoutError<'tcx>>,
+
+    [] dylib_dependency_formats: MetaDataByCrateNum(CrateNum)
+                                    -> Rc<Vec<(CrateNum, LinkagePreference)>>,
 }
 
 fn type_param_predicates((item_id, param_id): (DefId, DefId)) -> DepConstructor {

src/librustc_driver/driver.rs

@@ -1049,7 +1049,7 @@ pub fn phase_4_translate_to_llvm<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
     time(time_passes,
          "resolving dependency formats",
-         || dependency_format::calculate(&tcx.sess));
+         || dependency_format::calculate(tcx));
 
     let translation =
         time(time_passes,

src/librustc_metadata/cstore_impl.rs

@@ -153,6 +153,7 @@ provide! { <'tcx> tcx, def_id, cdata, cnum,
     }
 
     ByCrateNum {
+        dylib_dependency_formats => { Rc::new(cdata.get_dylib_dependency_formats(&tcx.dep_graph)) }
     }
 }
 
@@ -229,12 +230,6 @@ impl CrateStore for cstore::CStore {
         }
     }
 
-    fn dylib_dependency_formats(&self, cnum: CrateNum)
-                                -> Vec<(CrateNum, LinkagePreference)>
-    {
-        self.get_crate_data(cnum).get_dylib_dependency_formats(&self.dep_graph)
-    }
-
     fn dep_kind(&self, cnum: CrateNum) -> DepKind
     {
         let data = self.get_crate_data(cnum);