From 5b71d769ffe751399b538fb0fdb51ec88345061b Mon Sep 17 00:00:00 2001
From: achernyak <artemchernyak@gmail.com>
Date: Thu, 4 May 2017 12:45:56 -0500
Subject: [PATCH] moved metadata provider impls to decoder

---
 src/librustc_metadata/cstore_impl.rs | 18 +++---------------
 src/librustc_metadata/decoder.rs     | 23 ++++++++++++++++++++---
 2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/src/librustc_metadata/cstore_impl.rs b/src/librustc_metadata/cstore_impl.rs
index b54db55c0e12..a0c887e95d6c 100644
--- a/src/librustc_metadata/cstore_impl.rs
+++ b/src/librustc_metadata/cstore_impl.rs
@@ -41,8 +41,6 @@ use rustc::hir::svh::Svh;
 use rustc_back::target::Target;
 use rustc::hir;
 
-use std::collections::BTreeMap;
-
 macro_rules! provide {
     (<$lt:tt> $tcx:ident, $def_id:ident, $cdata:ident $($name:ident => $compute:block)*) => {
         pub fn provide<$lt>(providers: &mut Providers<$lt>) {
@@ -121,21 +119,11 @@ provide! { <'tcx> tcx, def_id, cdata
     fn_arg_names => { cdata.get_fn_arg_names(def_id.index) }
     impl_parent => { cdata.get_parent_impl(def_id.index) }
     trait_of_item => { cdata.get_trait_of_item(def_id.index) }
-    item_body_nested_bodies => {
-        let map: BTreeMap<_, _> = cdata.entry(def_id.index).ast.into_iter().flat_map(|ast| {
-            ast.decode(cdata).nested_bodies.decode(cdata).map(|body| (body.id(), body))
-        }).collect();
-
-        Rc::new(map)
-    }
+    item_body_nested_bodies => { Rc::new(cdata.item_body_nested_bodies(def_id.index)) }
     const_is_rvalue_promotable_to_static => {
-        cdata.entry(def_id.index).ast.expect("const item missing `ast`")
-            .decode(cdata).rvalue_promotable_to_static
-    }
-    is_mir_available => {
-        !cdata.is_proc_macro(def_id.index) &&
-        cdata.maybe_entry(def_id.index).and_then(|item| item.decode(cdata).mir).is_some()
+        cdata.const_is_rvalue_promotable_to_static(def_id.index)
     }
+    is_mir_available => { cdata.is_item_mir_available(def_id.index) }
 }
 
 impl CrateStore for cstore::CStore {
diff --git a/src/librustc_metadata/decoder.rs b/src/librustc_metadata/decoder.rs
index ae755adcf5fb..b89b5181e7bb 100644
--- a/src/librustc_metadata/decoder.rs
+++ b/src/librustc_metadata/decoder.rs
@@ -29,6 +29,7 @@ use rustc::mir::Mir;
 
 use std::borrow::Cow;
 use std::cell::Ref;
+use std::collections::BTreeMap;
 use std::io;
 use std::mem;
 use std::rc::Rc;
@@ -448,16 +449,16 @@ impl<'tcx> EntryKind<'tcx> {
 }
 
 impl<'a, 'tcx> CrateMetadata {
-    pub fn is_proc_macro(&self, id: DefIndex) -> bool {
+    fn is_proc_macro(&self, id: DefIndex) -> bool {
         self.proc_macros.is_some() && id != CRATE_DEF_INDEX
     }
 
-    pub fn maybe_entry(&self, item_id: DefIndex) -> Option<Lazy<Entry<'tcx>>> {
+    fn maybe_entry(&self, item_id: DefIndex) -> Option<Lazy<Entry<'tcx>>> {
         assert!(!self.is_proc_macro(item_id));
         self.root.index.lookup(self.blob.raw_bytes(), item_id)
     }
 
-    pub fn entry(&self, item_id: DefIndex) -> Entry<'tcx> {
+    fn entry(&self, item_id: DefIndex) -> Entry<'tcx> {
         match self.maybe_entry(item_id) {
             None => {
                 bug!("entry: id not found: {:?} in crate {:?} with number {}",
@@ -779,6 +780,22 @@ impl<'a, 'tcx> CrateMetadata {
         tcx.alloc_tables(ast.tables.decode((self, tcx)))
     }
 
+    pub fn item_body_nested_bodies(&self, id: DefIndex) -> BTreeMap<hir::BodyId, hir::Body> {
+        self.entry(id).ast.into_iter().flat_map(|ast| {
+            ast.decode(self).nested_bodies.decode(self).map(|body| (body.id(), body))
+        }).collect()
+    }
+
+    pub fn const_is_rvalue_promotable_to_static(&self, id: DefIndex) -> bool {
+        self.entry(id).ast.expect("const item missing `ast`")
+            .decode(self).rvalue_promotable_to_static
+    }
+
+    pub fn is_item_mir_available(&self, id: DefIndex) -> bool {
+        !self.is_proc_macro(id) &&
+        self.maybe_entry(id).and_then(|item| item.decode(self).mir).is_some()
+    }
+
     pub fn maybe_get_optimized_mir(&self,
                                    tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                    id: DefIndex)