Rollup merge of rust-lang#129926 - nnethercote:mv-SanityCheck-and-MirPass, r=cjgillot

Move `SanityCheck` and `MirPass`

They are currently in `rustc_middle`. This PR moves them to `rustc_mir_transform`, which makes more sense.

r? ``@cjgillot``

Author: matthiaskrgr

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.
     ///

compiler/rustc_middle/src/util/common.rs

@@ -20,19 +20,3 @@ pub fn to_readable_str(mut val: usize) -> String {
 
     groups.join("_")
 }
-
-// const wrapper for `if let Some((_, tail)) = name.rsplit_once(':') { tail } else { name }`
-pub const fn c_name(name: &'static str) -> &'static str {
-    // FIXME Simplify the implementation once more `str` methods get const-stable.
-    // and inline into call site
-    let bytes = name.as_bytes();
-    let mut i = bytes.len();
-    while i > 0 && bytes[i - 1] != b':' {
-        i = i - 1;
-    }
-    let (_, bytes) = bytes.split_at(i);
-    match std::str::from_utf8(bytes) {
-        Ok(name) => name,
-        Err(_) => name,
-    }
-}

compiler/rustc_mir_dataflow/src/rustc_peek.rs

@@ -1,7 +1,7 @@
 use rustc_ast::MetaItem;
 use rustc_hir::def_id::DefId;
 use rustc_index::bit_set::BitSet;
-use rustc_middle::mir::{self, Body, Local, Location, MirPass};
+use rustc_middle::mir::{self, Body, Local, Location};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::Span;
@@ -18,8 +18,6 @@ use crate::impls::{
 use crate::move_paths::{HasMoveData, LookupResult, MoveData, MovePathIndex};
 use crate::{Analysis, JoinSemiLattice, ResultsCursor};
 
-pub struct SanityCheck;
-
 fn has_rustc_mir_with(tcx: TyCtxt<'_>, def_id: DefId, name: Symbol) -> Option<MetaItem> {
     for attr in tcx.get_attrs(def_id, sym::rustc_mir) {
         let items = attr.meta_item_list();
@@ -33,53 +31,50 @@ fn has_rustc_mir_with(tcx: TyCtxt<'_>, def_id: DefId, name: Symbol) -> Option<Me
     None
 }
 
-// FIXME: This should be a `MirLint`, but it needs to be moved back to `rustc_mir_transform` first.
-impl<'tcx> MirPass<'tcx> for SanityCheck {
-    fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
-        let def_id = body.source.def_id();
-        if !tcx.has_attr(def_id, sym::rustc_mir) {
-            debug!("skipping rustc_peek::SanityCheck on {}", tcx.def_path_str(def_id));
-            return;
-        } else {
-            debug!("running rustc_peek::SanityCheck on {}", tcx.def_path_str(def_id));
-        }
+pub fn sanity_check<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) {
+    let def_id = body.source.def_id();
+    if !tcx.has_attr(def_id, sym::rustc_mir) {
+        debug!("skipping rustc_peek::SanityCheck on {}", tcx.def_path_str(def_id));
+        return;
+    } else {
+        debug!("running rustc_peek::SanityCheck on {}", tcx.def_path_str(def_id));
+    }
 
-        let param_env = tcx.param_env(def_id);
-        let move_data = MoveData::gather_moves(body, tcx, param_env, |_| true);
+    let param_env = tcx.param_env(def_id);
+    let move_data = MoveData::gather_moves(body, tcx, param_env, |_| true);
 
-        if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_maybe_init).is_some() {
-            let flow_inits = MaybeInitializedPlaces::new(tcx, body, &move_data)
-                .into_engine(tcx, body)
-                .iterate_to_fixpoint();
+    if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_maybe_init).is_some() {
+        let flow_inits = MaybeInitializedPlaces::new(tcx, body, &move_data)
+            .into_engine(tcx, body)
+            .iterate_to_fixpoint();
 
-            sanity_check_via_rustc_peek(tcx, flow_inits.into_results_cursor(body));
-        }
+        sanity_check_via_rustc_peek(tcx, flow_inits.into_results_cursor(body));
+    }
 
-        if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_maybe_uninit).is_some() {
-            let flow_uninits = MaybeUninitializedPlaces::new(tcx, body, &move_data)
-                .into_engine(tcx, body)
-                .iterate_to_fixpoint();
+    if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_maybe_uninit).is_some() {
+        let flow_uninits = MaybeUninitializedPlaces::new(tcx, body, &move_data)
+            .into_engine(tcx, body)
+            .iterate_to_fixpoint();
 
-            sanity_check_via_rustc_peek(tcx, flow_uninits.into_results_cursor(body));
-        }
+        sanity_check_via_rustc_peek(tcx, flow_uninits.into_results_cursor(body));
+    }
 
-        if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_definite_init).is_some() {
-            let flow_def_inits = DefinitelyInitializedPlaces::new(body, &move_data)
-                .into_engine(tcx, body)
-                .iterate_to_fixpoint();
+    if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_definite_init).is_some() {
+        let flow_def_inits = DefinitelyInitializedPlaces::new(body, &move_data)
+            .into_engine(tcx, body)
+            .iterate_to_fixpoint();
 
-            sanity_check_via_rustc_peek(tcx, flow_def_inits.into_results_cursor(body));
-        }
+        sanity_check_via_rustc_peek(tcx, flow_def_inits.into_results_cursor(body));
+    }
 
-        if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_liveness).is_some() {
-            let flow_liveness = MaybeLiveLocals.into_engine(tcx, body).iterate_to_fixpoint();
+    if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_liveness).is_some() {
+        let flow_liveness = MaybeLiveLocals.into_engine(tcx, body).iterate_to_fixpoint();
 
-            sanity_check_via_rustc_peek(tcx, flow_liveness.into_results_cursor(body));
-        }
+        sanity_check_via_rustc_peek(tcx, flow_liveness.into_results_cursor(body));
+    }
 
-        if has_rustc_mir_with(tcx, def_id, sym::stop_after_dataflow).is_some() {
-            tcx.dcx().emit_fatal(StopAfterDataFlowEndedCompilation);
-        }
+    if has_rustc_mir_with(tcx, def_id, sym::stop_after_dataflow).is_some() {
+        tcx.dcx().emit_fatal(StopAfterDataFlowEndedCompilation);
     }
 }
 

compiler/rustc_mir_transform/src/abort_unwinding_calls.rs

@@ -22,7 +22,7 @@ use rustc_target::spec::PanicStrategy;
 #[derive(PartialEq)]
 pub struct AbortUnwindingCalls;
 
-impl<'tcx> MirPass<'tcx> for AbortUnwindingCalls {
+impl<'tcx> crate::MirPass<'tcx> for AbortUnwindingCalls {
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         let def_id = body.source.def_id();
         let kind = tcx.def_kind(def_id);

compiler/rustc_mir_transform/src/add_call_guards.rs

@@ -30,7 +30,7 @@ pub use self::AddCallGuards::*;
  *
  */
 
-impl<'tcx> MirPass<'tcx> for AddCallGuards {
+impl<'tcx> crate::MirPass<'tcx> for AddCallGuards {
     fn run_pass(&self, _tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         self.add_call_guards(body);
     }

compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs

@@ -37,7 +37,7 @@ use crate::util;
 /// blowup.
 pub struct AddMovesForPackedDrops;
 
-impl<'tcx> MirPass<'tcx> for AddMovesForPackedDrops {
+impl<'tcx> crate::MirPass<'tcx> for AddMovesForPackedDrops {
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         debug!("add_moves_for_packed_drops({:?} @ {:?})", body.source, body.span);
         add_moves_for_packed_drops(tcx, body);

compiler/rustc_mir_transform/src/add_retag.rs

@@ -48,7 +48,7 @@ fn may_contain_reference<'tcx>(ty: Ty<'tcx>, depth: u32, tcx: TyCtxt<'tcx>) -> b
     }
 }
 
-impl<'tcx> MirPass<'tcx> for AddRetag {
+impl<'tcx> crate::MirPass<'tcx> for AddRetag {
     fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
         sess.opts.unstable_opts.mir_emit_retag
     }

compiler/rustc_mir_transform/src/add_subtyping_projections.rs

@@ -62,7 +62,7 @@ pub fn subtype_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
     checker.patcher.apply(body);
 }
 
-impl<'tcx> MirPass<'tcx> for Subtyper {
+impl<'tcx> crate::MirPass<'tcx> for Subtyper {
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         subtype_finder(tcx, body);
     }

compiler/rustc_mir_transform/src/check_alignment.rs

@@ -9,7 +9,7 @@ use tracing::{debug, trace};
 
 pub struct CheckAlignment;
 
-impl<'tcx> MirPass<'tcx> for CheckAlignment {
+impl<'tcx> crate::MirPass<'tcx> for CheckAlignment {
     fn is_enabled(&self, sess: &Session) -> bool {
         // FIXME(#112480) MSVC and rustc disagree on minimum stack alignment on x86 Windows
         if sess.target.llvm_target == "i686-pc-windows-msvc" {

compiler/rustc_mir_transform/src/check_const_item_mutation.rs

@@ -6,11 +6,11 @@ use rustc_session::lint::builtin::CONST_ITEM_MUTATION;
 use rustc_span::def_id::DefId;
 use rustc_span::Span;
 
-use crate::{errors, MirLint};
+use crate::errors;
 
 pub struct CheckConstItemMutation;
 
-impl<'tcx> MirLint<'tcx> for CheckConstItemMutation {
+impl<'tcx> crate::MirLint<'tcx> for CheckConstItemMutation {
     fn run_lint(&self, tcx: TyCtxt<'tcx>, body: &Body<'tcx>) {
         let mut checker = ConstMutationChecker { body, tcx, target_local: None };
         checker.visit_body(body);