From 4c2f3ff44263b813d4211150613edff0c5c92c30 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Wed, 24 Aug 2016 11:01:12 -0400
Subject: [PATCH] remove the "misc-items" from meta-data

It was duplicating information available elsewhere.
---
 src/librustc_metadata/common.rs  |  4 ++--
 src/librustc_metadata/decoder.rs | 11 ++--------
 src/librustc_metadata/encoder.rs | 35 +++++---------------------------
 3 files changed, 9 insertions(+), 41 deletions(-)

diff --git a/src/librustc_metadata/common.rs b/src/librustc_metadata/common.rs
index 1e6c74bef8da..29b9cc0d1d92 100644
--- a/src/librustc_metadata/common.rs
+++ b/src/librustc_metadata/common.rs
@@ -149,9 +149,9 @@ pub const tag_items_data_item_visibility: usize = 0x78;
 pub const tag_items_data_item_inherent_impl: usize = 0x79;
 // GAP 0x7a
 pub const tag_mod_child: usize = 0x7b;
-pub const tag_misc_info: usize = 0x108; // top-level only
-pub const tag_misc_info_crate_items: usize = 0x7c;
+// GAP 0x7c
 
+// GAP 0x108
 pub const tag_impls: usize = 0x109; // top-level only
 pub const tag_impls_trait: usize = 0x7d;
 pub const tag_impls_trait_impl: usize = 0x7e;
diff --git a/src/librustc_metadata/decoder.rs b/src/librustc_metadata/decoder.rs
index 6b48b4dfabcf..d75d5a3b3544 100644
--- a/src/librustc_metadata/decoder.rs
+++ b/src/librustc_metadata/decoder.rs
@@ -23,6 +23,7 @@ use index;
 use tls_context;
 use tydecode::TyDecoder;
 
+use rustc::hir::def_id::CRATE_DEF_INDEX;
 use rustc::hir::svh::Svh;
 use rustc::hir::map as hir_map;
 use rustc::hir::map::DefKey;
@@ -732,15 +733,7 @@ pub fn each_top_level_item_of_crate<F, G>(cdata: Cmd, get_crate_data: G, callbac
     where F: FnMut(DefLike, ast::Name, ty::Visibility),
           G: FnMut(ast::CrateNum) -> Rc<CrateMetadata>,
 {
-    let root_doc = rbml::Doc::new(cdata.data());
-    let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
-    let crate_items_doc = reader::get_doc(misc_info_doc,
-                                          tag_misc_info_crate_items);
-
-    each_child_of_item_or_crate(cdata,
-                                crate_items_doc,
-                                get_crate_data,
-                                callback)
+    each_child_of_item(cdata, CRATE_DEF_INDEX, get_crate_data, callback)
 }
 
 pub fn get_item_name(cdata: Cmd, id: DefIndex) -> ast::Name {
diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index 23398a0400c5..603b7a483b90 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -1693,30 +1693,6 @@ fn encode_impls<'a>(ecx: &'a EncodeContext,
     rbml_w.end_tag();
 }
 
-fn encode_misc_info(ecx: &EncodeContext,
-                    krate: &hir::Crate,
-                    rbml_w: &mut Encoder) {
-    rbml_w.start_tag(tag_misc_info);
-    rbml_w.start_tag(tag_misc_info_crate_items);
-    for item_id in &krate.module.item_ids {
-        rbml_w.wr_tagged_u64(tag_mod_child,
-                             def_to_u64(ecx.tcx.map.local_def_id(item_id.id)));
-
-        let item = ecx.tcx.map.expect_item(item_id.id);
-        each_auxiliary_node_id(item, |auxiliary_node_id| {
-            rbml_w.wr_tagged_u64(tag_mod_child,
-                                 def_to_u64(ecx.tcx.map.local_def_id(auxiliary_node_id)));
-            true
-        });
-    }
-
-    // Encode reexports for the root module.
-    encode_reexports(ecx, rbml_w, 0);
-
-    rbml_w.end_tag();
-    rbml_w.end_tag();
-}
-
 // Encodes all reachable symbols in this crate into the metadata.
 //
 // This pass is seeded off the reachability list calculated in the
@@ -1861,7 +1837,7 @@ fn encode_metadata_inner(rbml_w: &mut Encoder,
         codemap_bytes: u64,
         macro_defs_bytes: u64,
         impl_bytes: u64,
-        misc_bytes: u64,
+        reachable_bytes: u64,
         item_bytes: u64,
         index_bytes: u64,
         xref_bytes: u64,
@@ -1877,7 +1853,7 @@ fn encode_metadata_inner(rbml_w: &mut Encoder,
         codemap_bytes: 0,
         macro_defs_bytes: 0,
         impl_bytes: 0,
-        misc_bytes: 0,
+        reachable_bytes: 0,
         item_bytes: 0,
         index_bytes: 0,
         xref_bytes: 0,
@@ -1931,11 +1907,10 @@ fn encode_metadata_inner(rbml_w: &mut Encoder,
     encode_impls(&ecx, krate, rbml_w);
     stats.impl_bytes = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap() - i;
 
-    // Encode miscellaneous info.
+    // Encode reachability info.
     i = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap();
-    encode_misc_info(&ecx, krate, rbml_w);
     encode_reachable(&ecx, rbml_w);
-    stats.misc_bytes = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap() - i;
+    stats.reachable_bytes = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap() - i;
 
     // Encode and index the items.
     rbml_w.start_tag(tag_items);
@@ -1972,7 +1947,7 @@ fn encode_metadata_inner(rbml_w: &mut Encoder,
         println!("         codemap bytes: {}", stats.codemap_bytes);
         println!("       macro def bytes: {}", stats.macro_defs_bytes);
         println!("            impl bytes: {}", stats.impl_bytes);
-        println!("            misc bytes: {}", stats.misc_bytes);
+        println!("       reachable bytes: {}", stats.reachable_bytes);
         println!("            item bytes: {}", stats.item_bytes);
         println!("           index bytes: {}", stats.index_bytes);
         println!("            xref bytes: {}", stats.xref_bytes);