Move `MirPass` to `rustc_mir_transform`.

Because that's now the only crate that uses it.

Moving stuff out of `rustc_middle` is always welcome.

I chose to use `impl crate::MirPass`/`impl crate::MirLint` (with
explicit `crate::`) everywhere because that's the only mention of
`MirPass`/`MirLint` used in all of these files. (Prior to this change,
`MirPass` was mostly imported via `use rustc_middle::mir::*` items.)

1 files changed, 0 insertions, 62 deletions

diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index 7b901915037..081a23b6ff3 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -3,8 +3,6 @@
 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/mir/index.html
 
 use std::borrow::Cow;
-use std::cell::RefCell;
-use std::collections::hash_map::Entry;
 use std::fmt::{self, Debug, Formatter};
 use std::ops::{Index, IndexMut};
 use std::{iter, mem};
@@ -26,7 +24,6 @@ use rustc_index::bit_set::BitSet;
 use rustc_index::{Idx, IndexSlice, IndexVec};
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
 use rustc_serialize::{Decodable, Encodable};
-use rustc_session::Session;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::Symbol;
 use rustc_span::{Span, DUMMY_SP};
@@ -106,65 +103,6 @@ impl<'tcx> HasLocalDecls<'tcx> for Body<'tcx> {
     }
 }
 
-thread_local! {
-    static PASS_NAMES: RefCell<FxHashMap<&'static str, &'static str>> = {
-        RefCell::new(FxHashMap::default())
-    };
-}
-
-/// Converts a MIR pass name into a snake case form to match the profiling naming style.
-fn to_profiler_name(type_name: &'static str) -> &'static str {
-    PASS_NAMES.with(|names| match names.borrow_mut().entry(type_name) {
-        Entry::Occupied(e) => *e.get(),
-        Entry::Vacant(e) => {
-            let snake_case: String = type_name
-                .chars()
-                .flat_map(|c| {
-                    if c.is_ascii_uppercase() {
-                        vec!['_', c.to_ascii_lowercase()]
-                    } else if c == '-' {
-                        vec!['_']
-                    } else {
-                        vec![c]
-                    }
-                })
-                .collect();
-            let result = &*String::leak(format!("mir_pass{}", snake_case));
-            e.insert(result);
-            result
-        }
-    })
-}
-
-/// A streamlined trait that you can implement to create a pass; the
-/// pass will be named after the type, and it will consist of a main
-/// loop that goes over each available MIR and applies `run_pass`.
-pub trait MirPass<'tcx> {
-    fn name(&self) -> &'static str {
-        // FIXME Simplify the implementation once more `str` methods get const-stable.
-        // See copypaste in `MirLint`
-        const {
-            let name = std::any::type_name::<Self>();
-            crate::util::common::c_name(name)
-        }
-    }
-
-    fn profiler_name(&self) -> &'static str {
-        to_profiler_name(self.name())
-    }
-
-    /// Returns `true` if this pass is enabled with the current combination of compiler flags.
-    fn is_enabled(&self, _sess: &Session) -> bool {
-        true
-    }
-
-    fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>);
-
-    fn is_mir_dump_enabled(&self) -> bool {
-        true
-    }
-}
-
 impl MirPhase {
     /// Gets the index of the current MirPhase within the set of all `MirPhase`s.
     ///