Rollup merge of #119577 - tmiasko:lint, r=oli-obk

Migrate memory overlap check from validator to lint

The check attempts to identify potential undefined behaviour, rather
than whether MIR is well-formed. It belongs in the lint not validator.

Follow up to changes from #119077.

compiler/rustc_mir_transform/src/dest_prop.rs

@@ -133,7 +133,6 @@
 
 use std::collections::hash_map::{Entry, OccupiedEntry};
 
-use crate::simplify::remove_dead_blocks;
 use crate::MirPass;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_index::bit_set::BitSet;
@@ -241,12 +240,6 @@ impl<'tcx> MirPass<'tcx> for DestinationPropagation {
             apply_merges(body, tcx, &merges, &merged_locals);
         }
 
-        if round_count != 0 {
-            // Merging can introduce overlap between moved arguments and/or call destination in an
-            // unreachable code, which validator considers to be ill-formed.
-            remove_dead_blocks(body);
-        }
-
         trace!(round_count);
     }
 }

compiler/rustc_mir_transform/src/lint.rs

@@ -1,6 +1,7 @@
 //! This pass statically detects code which has undefined behaviour or is likely to be erroneous.
 //! It can be used to locate problems in MIR building or optimizations. It assumes that all code
 //! can be executed, so it has false positives.
+use rustc_data_structures::fx::FxHashSet;
 use rustc_index::bit_set::BitSet;
 use rustc_middle::mir::visit::{PlaceContext, Visitor};
 use rustc_middle::mir::*;
@@ -11,7 +12,6 @@ use rustc_mir_dataflow::{Analysis, ResultsCursor};
 use std::borrow::Cow;
 
 pub fn lint_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, when: String) {
-    let reachable_blocks = traversal::reachable_as_bitset(body);
     let always_live_locals = &always_storage_live_locals(body);
 
     let maybe_storage_live = MaybeStorageLive::new(Cow::Borrowed(always_live_locals))
@@ -24,17 +24,19 @@ pub fn lint_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, when: String) {
         .iterate_to_fixpoint()
         .into_results_cursor(body);
 
-    Lint {
+    let mut lint = Lint {
         tcx,
         when,
         body,
         is_fn_like: tcx.def_kind(body.source.def_id()).is_fn_like(),
         always_live_locals,
-        reachable_blocks,
         maybe_storage_live,
         maybe_storage_dead,
+        places: Default::default(),
+    };
+    for (bb, data) in traversal::reachable(body) {
+        lint.visit_basic_block_data(bb, data);
     }
-    .visit_body(body);
 }
 
 struct Lint<'a, 'tcx> {
@@ -43,9 +45,9 @@ struct Lint<'a, 'tcx> {
     body: &'a Body<'tcx>,
     is_fn_like: bool,
     always_live_locals: &'a BitSet<Local>,
-    reachable_blocks: BitSet<BasicBlock>,
     maybe_storage_live: ResultsCursor<'a, 'tcx, MaybeStorageLive<'a>>,
     maybe_storage_dead: ResultsCursor<'a, 'tcx, MaybeStorageDead<'a>>,
+    places: FxHashSet<PlaceRef<'tcx>>,
 }
 
 impl<'a, 'tcx> Lint<'a, 'tcx> {
@@ -67,7 +69,7 @@ impl<'a, 'tcx> Lint<'a, 'tcx> {
 
 impl<'a, 'tcx> Visitor<'tcx> for Lint<'a, 'tcx> {
     fn visit_local(&mut self, local: Local, context: PlaceContext, location: Location) {
-        if self.reachable_blocks.contains(location.block) && context.is_use() {
+        if context.is_use() {
             self.maybe_storage_dead.seek_after_primary_effect(location);
             if self.maybe_storage_dead.get().contains(local) {
                 self.fail(location, format!("use of local {local:?}, which has no storage here"));
@@ -76,18 +78,28 @@ impl<'a, 'tcx> Visitor<'tcx> for Lint<'a, 'tcx> {
     }
 
     fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) {
-        match statement.kind {
-            StatementKind::StorageLive(local) => {
-                if self.reachable_blocks.contains(location.block) {
-                    self.maybe_storage_live.seek_before_primary_effect(location);
-                    if self.maybe_storage_live.get().contains(local) {
+        match &statement.kind {
+            StatementKind::Assign(box (dest, rvalue)) => {
+                if let Rvalue::Use(Operand::Copy(src) | Operand::Move(src)) = rvalue {
+                    // The sides of an assignment must not alias. Currently this just checks whether
+                    // the places are identical.
+                    if dest == src {
                         self.fail(
                             location,
-                            format!("StorageLive({local:?}) which already has storage here"),
+                            "encountered `Assign` statement with overlapping memory",
                         );
                     }
                 }
             }
+            StatementKind::StorageLive(local) => {
+                self.maybe_storage_live.seek_before_primary_effect(location);
+                if self.maybe_storage_live.get().contains(*local) {
+                    self.fail(
+                        location,
+                        format!("StorageLive({local:?}) which already has storage here"),
+                    );
+                }
+            }
             _ => {}
         }
 
@@ -95,9 +107,9 @@ impl<'a, 'tcx> Visitor<'tcx> for Lint<'a, 'tcx> {
     }
 
     fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {
-        match terminator.kind {
+        match &terminator.kind {
             TerminatorKind::Return => {
-                if self.is_fn_like && self.reachable_blocks.contains(location.block) {
+                if self.is_fn_like {
                     self.maybe_storage_live.seek_after_primary_effect(location);
                     for local in self.maybe_storage_live.get().iter() {
                         if !self.always_live_locals.contains(local) {
@@ -111,6 +123,28 @@ impl<'a, 'tcx> Visitor<'tcx> for Lint<'a, 'tcx> {
                     }
                 }
             }
+            TerminatorKind::Call { args, destination, .. } => {
+                // The call destination place and Operand::Move place used as an argument might be
+                // passed by a reference to the callee. Consequently they must be non-overlapping.
+                // Currently this simply checks for duplicate places.
+                self.places.clear();
+                self.places.insert(destination.as_ref());
+                let mut has_duplicates = false;
+                for arg in args {
+                    if let Operand::Move(place) = arg {
+                        has_duplicates |= !self.places.insert(place.as_ref());
+                    }
+                }
+                if has_duplicates {
+                    self.fail(
+                        location,
+                        format!(
+                            "encountered overlapping memory in `Move` arguments to `Call` terminator: {:?}",
+                            terminator.kind,
+                        ),
+                    );
+                }
+            }
             _ => {}
         }
 

compiler/rustc_mir_transform/src/pass_manager.rs

@@ -109,14 +109,15 @@ fn run_passes_inner<'tcx>(
     phase_change: Option<MirPhase>,
     validate_each: bool,
 ) {
-    let lint = tcx.sess.opts.unstable_opts.lint_mir & !body.should_skip();
-    let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir & !body.should_skip();
     let overridden_passes = &tcx.sess.opts.unstable_opts.mir_enable_passes;
     trace!(?overridden_passes);
 
     let prof_arg = tcx.sess.prof.enabled().then(|| format!("{:?}", body.source.def_id()));
 
     if !body.should_skip() {
+        let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir;
+        let lint = tcx.sess.opts.unstable_opts.lint_mir;
+
         for pass in passes {
             let name = pass.name();
 
@@ -162,7 +163,12 @@ fn run_passes_inner<'tcx>(
         body.pass_count = 0;
 
         dump_mir_for_phase_change(tcx, body);
-        if validate || new_phase == MirPhase::Runtime(RuntimePhase::Optimized) {
+
+        let validate =
+            (validate_each & tcx.sess.opts.unstable_opts.validate_mir & !body.should_skip())
+                || new_phase == MirPhase::Runtime(RuntimePhase::Optimized);
+        let lint = tcx.sess.opts.unstable_opts.lint_mir & !body.should_skip();
+        if validate {
             validate_body(tcx, body, format!("after phase change to {}", new_phase.name()));
         }
         if lint {