From 3a570075b191832e8ed63e018db871017132701a Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Mon, 7 Jan 2013 12:48:46 -0800
Subject: [PATCH] librustc: Remove unused `mod_path_map`. This was expensive to
 build. Saves another 15% or so. r=tjc

---
 src/librustc/metadata/cstore.rs  | 25 ++-----------------------
 src/librustc/metadata/decoder.rs | 29 -----------------------------
 2 files changed, 2 insertions(+), 52 deletions(-)

diff --git a/src/librustc/metadata/cstore.rs b/src/librustc/metadata/cstore.rs
index 212f9558331..5d4694df7d3 100644
--- a/src/librustc/metadata/cstore.rs
+++ b/src/librustc/metadata/cstore.rs
@@ -43,7 +43,6 @@ export get_used_link_args;
 export add_use_stmt_cnum;
 export find_use_stmt_cnum;
 export get_dep_hashes;
-export get_path;
 
 
 // A map from external crate numbers (as decoded from some crate file) to
@@ -52,11 +51,6 @@ export get_path;
 // own crate numbers.
 type cnum_map = map::HashMap<ast::crate_num, ast::crate_num>;
 
-// Multiple items may have the same def_id in crate metadata. They may be
-// renamed imports or reexports. This map keeps the "real" module path
-// and def_id.
-type mod_path_map = map::HashMap<ast::def_id, @~str>;
-
 type crate_metadata = @{name: ~str,
                         data: @~[u8],
                         cnum_map: cnum_map,
@@ -72,7 +66,6 @@ enum CStore { private(cstore_private), }
 type cstore_private =
     @{metas: map::HashMap<ast::crate_num, crate_metadata>,
       use_crate_map: use_crate_map,
-      mod_path_map: mod_path_map,
       mut used_crate_files: ~[Path],
       mut used_libraries: ~[~str],
       mut used_link_args: ~[~str],
@@ -89,10 +82,8 @@ pure fn p(cstore: CStore) -> cstore_private {
 fn mk_cstore(intr: @ident_interner) -> CStore {
     let meta_cache = map::HashMap();
     let crate_map = map::HashMap();
-    let mod_path_map = HashMap();
     return private(@{metas: meta_cache,
                      use_crate_map: crate_map,
-                     mod_path_map: mod_path_map,
                      mut used_crate_files: ~[],
                      mut used_libraries: ~[],
                      mut used_link_args: ~[],
@@ -113,18 +104,10 @@ fn get_crate_vers(cstore: CStore, cnum: ast::crate_num) -> ~str {
     return decoder::get_crate_vers(cdata.data);
 }
 
-fn set_crate_data(cstore: CStore, cnum: ast::crate_num,
+fn set_crate_data(cstore: CStore,
+                  cnum: ast::crate_num,
                   data: crate_metadata) {
     p(cstore).metas.insert(cnum, data);
-    let get_crate_data: decoder::GetCrateDataCb = |cnum| {
-        cstore::get_crate_data(cstore, cnum)
-    };
-    for vec::each(decoder::get_crate_module_paths(cstore.intr, data,
-                                                  get_crate_data)) |dp| {
-        let (did, path) = *dp;
-        let d = {crate: cnum, node: did.node};
-        p(cstore).mod_path_map.insert(d, @path);
-    }
 }
 
 fn have_crate_data(cstore: CStore, cnum: ast::crate_num) -> bool {
@@ -197,10 +180,6 @@ fn get_dep_hashes(cstore: CStore) -> ~[~str] {
     return vec::map(sorted, mapper);
 }
 
-fn get_path(cstore: CStore, d: ast::def_id) -> ~[~str] {
-    option::map_default(&p(cstore).mod_path_map.find(d), ~[],
-                        |ds| str::split_str(**ds, ~"::"))
-}
 // Local Variables:
 // mode: rust
 // fill-column: 78;
diff --git a/src/librustc/metadata/decoder.rs b/src/librustc/metadata/decoder.rs
index d9486bf4e9f..91926ff2f9a 100644
--- a/src/librustc/metadata/decoder.rs
+++ b/src/librustc/metadata/decoder.rs
@@ -68,7 +68,6 @@ export get_supertraits;
 export get_method_names_if_trait;
 export get_type_name_if_impl;
 export get_item_attrs;
-export get_crate_module_paths;
 export def_like;
 export dl_def;
 export dl_impl;
@@ -1121,34 +1120,6 @@ fn iter_crate_items(intr: @ident_interner, cdata: cmd,
     }
 }
 
-fn get_crate_module_paths(intr: @ident_interner, cdata: cmd,
-                          get_crate_data: GetCrateDataCb)
-                                    -> ~[(ast::def_id, ~str)] {
-    fn mod_of_path(p: ~str) -> ~str {
-        str::connect(vec::init(str::split_str(p, ~"::")), ~"::")
-    }
-
-    // find all module (path, def_ids), which are not
-    // fowarded path due to renamed import or reexport
-    let mut res = ~[];
-    let mods = map::HashMap();
-    do iter_crate_items(intr, cdata, get_crate_data) |path, did| {
-        let m = mod_of_path(path);
-        if str::is_not_empty(m) {
-            // if m has a sub-item, it must be a module
-            mods.insert(m, true);
-        }
-        // Collect everything by now. There might be multiple
-        // paths pointing to the same did. Those will be
-        // unified later by using the mods map
-        res.push((did, path));
-    }
-    return do vec::filter(res) |x| {
-        let (_, xp) = *x;
-        mods.contains_key(xp)
-    }
-}
-
 fn list_crate_metadata(intr: @ident_interner, bytes: @~[u8],
                        out: io::Writer) {
     let hash = get_crate_hash(bytes);