{"action":"created","comment":{"url":"https://api.github.com/repos/rust-lang/rust/pulls/comments/79493125","id":79493125,"diff_hunk":"@@ -122,6 +118,93 @@ impl<'a, 'tcx> DerefMut for DecodeContext<'a, 'tcx> {\n     }\n }\n \n+impl<'a, 'tcx> SpecializedDecoder<NodeId> for DecodeContext<'a, 'tcx> {\n+    fn specialized_decode(&mut self) -> Result<NodeId, Self::Error> {\n+        let id = u32::decode(self)?;\n+\n+        // from_id_range should be non-empty\n+        assert!(!self.from_id_range.empty());\n+        // Make sure that translating the NodeId will actually yield a\n+        // meaningful result\n+        if !self.from_id_range.contains(NodeId::from_u32(id)) {\n+            bug!(\"NodeId::decode: {} out of DecodeContext range ({:?} -> {:?})\",\n+                 id, self.from_id_range, self.to_id_range);\n+        }\n+\n+        // Use wrapping arithmetic because otherwise it introduces control flow.\n+        // Maybe we should just have the control flow? -- aatch\n+        Ok(NodeId::from_u32(id.wrapping_sub(self.from_id_range.min.as_u32())\n+                              .wrapping_add(self.to_id_range.min.as_u32())))\n+    }\n+}\n+\n+impl<'a, 'tcx> SpecializedDecoder<CrateNum> for DecodeContext<'a, 'tcx> {","path":"src/librustc_metadata/decoder.rs","position":null,"original_position":104,"commit_id":"33295fd3504e89a68971dfec314d8881ed9f1132","original_commit_id":"4fb991f15d9f85b49a21ee065ec34aa21acac96c","user":{"login":"nikomatsakis","id":155238,"avatar_url":"https://avatars.githubusercontent.com/u/155238?v=3","gravatar_id":"","url":"https://api.github.com/users/nikomatsakis","html_url":"https://github.com/nikomatsakis","followers_url":"https://api.github.com/users/nikomatsakis/followers","following_url":"https://api.github.com/users/nikomatsakis/following{/other_user}","gists_url":"https://api.github.com/users/nikomatsakis/gists{/gist_id}","starred_url":"https://api.github.com/users/nikomatsakis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nikomatsakis/subscriptions","organizations_url":"https://api.github.com/users/nikomatsakis/orgs","repos_url":"https://api.github.com/users/nikomatsakis/repos","events_url":"https://api.github.com/users/nikomatsakis/events{/privacy}","received_events_url":"https://api.github.com/users/nikomatsakis/received_events","type":"User","site_admin":false},"body":"This is really neat.","created_at":"2016-09-19T21:27:09Z","updated_at":"2016-09-19T21:27:15Z","html_url":"https://github.com/rust-lang/rust/pull/36551#discussion_r79493125","pull_request_url":"https://api.github.com/repos/rust-lang/rust/pulls/36551","_links":{"self":{"href":"https://api.github.com/repos/rust-lang/rust/pulls/comments/79493125"},"html":{"href":"https://github.com/rust-lang/rust/pull/36551#discussion_r79493125"},"pull_request":{"href":"https://api.github.com/repos/rust-lang/rust/pulls/36551"}}},"pull_request":{"url":"https://api.github.com/repos/rust-lang/rust/pulls/36551","id":85667539,"html_url":"https://github.com/rust-lang/rust/pull/36551","diff_url":"https://github.com/rust-lang/rust/pull/36551.diff","patch_url":"https://github.com/rust-lang/rust/pull/36551.patch","issue_url":"https://api.github.com/repos/rust-lang/rust/issues/36551","number":36551,"state":"open","locked":false,"title":"Refactor away RBML from rustc_metadata. ","user":{"login":"eddyb","id":77424,"avatar_url":"https://avatars.githubusercontent.com/u/77424?v=3","gravatar_id":"","url":"https://api.github.com/users/eddyb","html_url":"https://github.com/eddyb","followers_url":"https://api.github.com/users/eddyb/followers","following_url":"https://api.github.com/users/eddyb/following{/other_user}","gists_url":"https://api.github.com/users/eddyb/gists{/gist_id}","starred_url":"https://api.github.com/users/eddyb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/eddyb/subscriptions","organizations_url":"https://api.github.com/users/eddyb/orgs","repos_url":"https://api.github.com/users/eddyb/repos","events_url":"https://api.github.com/users/eddyb/events{/privacy}","received_events_url":"https://api.github.com/users/eddyb/received_events","type":"User","site_admin":false},"body":"RBML and `ty{en,de}code` have had their long-overdue purge. Summary of changes:\r\n* Metadata is now a tree encoded in post-order and with relative backward references pointing to children nodes. With auto-deriving and type safety, this makes maintenance and adding new information to metadata painless and bug-free by default. It's also more compact and cache-friendly (cache misses should be proportional to the depth of the node being accessed, not the number of siblings as in EBML/RBML).\r\n* Metadata sizes have been reduced, for `libcore` it went down 16% (`8.38MB` -> `7.05MB`) and for `libstd` 14% (`3.53MB` -> `3.03MB`), while encoding more or less the same information\r\n* Specialization is used in the bundled `libserialize` (crates.io `rustc_serialize` remains unaffected) to customize the encoding (and more importantly, decoding) of various types, most notably those interned in the `TyCtxt`. Some of this abuses a soundness hole pending a fix (cc @aturon), but when that fix arrives, we'll move to macros 1.1 `#[derive]` and custom `TyCtxt`-aware serialization traits.\r\n* Enumerating children of modules from other crates is now orthogonal to describing those items via `Def` - this is a step towards bridging crate-local HIR and cross-crate metadata\r\n* `CrateNum` has been moved to `rustc` and both it and `NodeId` are now newtypes instead of `u32` aliases, for specializing their decoding. This is `[syntax-breaking]` (cc @Manishearth ).\r\n\r\ncc 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