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Rollup merge of rust-lang#122168 - compiler-errors:inline-coroutine-b…
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…ody-validation, r=cjgillot

Fix validation on substituted callee bodies in MIR inliner

When inlining a coroutine, we will substitute the MIR body with the args of the call. There is code in the MIR validator that attempts to prevent query cycles, and will use the coroutine body directly when it detects that's the body that's being validated. That means that when inlining a coroutine body that has been substituted, it may no longer be parameterized over the original args of the coroutine, which will lead to substitution ICEs.

Fixes rust-lang#119064
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@matthiaskrgr @RenjiSann
matthiaskrgr authored and RenjiSann committed Mar 25, 2024
2 parents 7ae67c9 + 78ebb93 commit 6faf40b
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Showing 6 changed files with 669 additions and 10 deletions.
19 changes: 15 additions & 4 deletions compiler/rustc_const_eval/src/transform/validate.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@ impl<'tcx> MirPass<'tcx> for Validator {
cfg_checker.check_cleanup_control_flow();

// Also run the TypeChecker.
for (location, msg) in validate_types(tcx, self.mir_phase, param_env, body) {
for (location, msg) in validate_types(tcx, self.mir_phase, param_env, body, body) {
cfg_checker.fail(location, msg);
}

Expand Down Expand Up @@ -540,19 +540,25 @@ impl<'a, 'tcx> Visitor<'tcx> for CfgChecker<'a, 'tcx> {

/// A faster version of the validation pass that only checks those things which may break when
/// instantiating any generic parameters.
///
/// `caller_body` is used to detect cycles in MIR inlining and MIR validation before
/// `optimized_mir` is available.
pub fn validate_types<'tcx>(
tcx: TyCtxt<'tcx>,
mir_phase: MirPhase,
param_env: ty::ParamEnv<'tcx>,
body: &Body<'tcx>,
caller_body: &Body<'tcx>,
) -> Vec<(Location, String)> {
let mut type_checker = TypeChecker { body, tcx, param_env, mir_phase, failures: Vec::new() };
let mut type_checker =
TypeChecker { body, caller_body, tcx, param_env, mir_phase, failures: Vec::new() };
type_checker.visit_body(body);
type_checker.failures
}

struct TypeChecker<'a, 'tcx> {
body: &'a Body<'tcx>,
caller_body: &'a Body<'tcx>,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
mir_phase: MirPhase,
Expand Down Expand Up @@ -704,8 +710,13 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
}
&ty::Coroutine(def_id, args) => {
let f_ty = if let Some(var) = parent_ty.variant_index {
let gen_body = if def_id == self.body.source.def_id() {
self.body
// If we're currently validating an inlined copy of this body,
// then it will no longer be parameterized over the original
// args of the coroutine. Otherwise, we prefer to use this body
// since we may be in the process of computing this MIR in the
// first place.
let gen_body = if def_id == self.caller_body.source.def_id() {
self.caller_body
} else {
self.tcx.optimized_mir(def_id)
};
Expand Down
9 changes: 3 additions & 6 deletions compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,12 +64,9 @@ impl<'tcx> MirPass<'tcx> for ByMoveBody {
let mut by_move_body = body.clone();
MakeByMoveBody { tcx, by_ref_fields, by_move_coroutine_ty }.visit_body(&mut by_move_body);
dump_mir(tcx, false, "coroutine_by_move", &0, &by_move_body, |_, _| Ok(()));
by_move_body.source = mir::MirSource {
instance: InstanceDef::CoroutineKindShim {
coroutine_def_id: coroutine_def_id.to_def_id(),
},
promoted: None,
};
by_move_body.source = mir::MirSource::from_instance(InstanceDef::CoroutineKindShim {
coroutine_def_id: coroutine_def_id.to_def_id(),
});
body.coroutine.as_mut().unwrap().by_move_body = Some(by_move_body);
}
}
Expand Down
1 change: 1 addition & 0 deletions compiler/rustc_mir_transform/src/inline.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,7 @@ impl<'tcx> Inliner<'tcx> {
MirPhase::Runtime(RuntimePhase::Optimized),
self.param_env,
&callee_body,
&caller_body,
)
.is_empty()
{
Expand Down
28 changes: 28 additions & 0 deletions tests/mir-opt/inline_coroutine_body.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
// skip-filecheck
//@ unit-test: Inline
//@ edition: 2021
//@ compile-flags: -Zinline-mir-hint-threshold=10000 -Zinline-mir-threshold=10000 --crate-type=lib

pub async fn run(permit: ActionPermit<'_, ()>, ctx: &mut core::task::Context<'_>) {
run2(permit, ctx);
}

// EMIT_MIR inline_coroutine_body.run2-{closure#0}.Inline.diff
fn run2<T>(permit: ActionPermit<'_, T>, ctx: &mut core::task::Context) {
_ = || {
let mut fut = ActionPermit::perform(permit);
let fut = unsafe { core::pin::Pin::new_unchecked(&mut fut) };
_ = core::future::Future::poll(fut, ctx);
};
}

pub struct ActionPermit<'a, T> {
_guard: core::cell::Ref<'a, T>,
}

impl<'a, T> ActionPermit<'a, T> {
async fn perform(self) {
core::future::ready(()).await
}
}
281 changes: 281 additions & 0 deletions tests/mir-opt/inline_coroutine_body.run2-{closure#0}.Inline.panic-abort.diff
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Original file line number Diff line number Diff line change
@@ -0,0 +1,281 @@
- // MIR for `run2::{closure#0}` before Inline
+ // MIR for `run2::{closure#0}` after Inline

fn run2::{closure#0}(_1: {closure@$DIR/inline_coroutine_body.rs:13:9: 13:11}) -> () {
debug permit => (_1.0: ActionPermit<'_, T>);
debug ctx => (*(_1.1: &mut std::task::Context<'_>));
let mut _0: ();
let mut _2: {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
let mut _3: ActionPermit<'_, T>;
let mut _5: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
let _6: ();
let mut _7: std::task::Poll<()>;
let mut _8: std::pin::Pin<&mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6}>;
let mut _9: &mut std::task::Context<'_>;
let mut _10: &mut std::task::Context<'_>;
scope 1 {
debug fut => _2;
let _4: std::pin::Pin<&mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6}>;
scope 2 {
debug fut => _4;
scope 4 {
}
+ scope 7 (inlined ActionPermit::<'_, T>::perform::{closure#0}) {
+ debug _task_context => _31;
+ debug self => ((*(_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6})).0: ActionPermit<'_, T>);
+ let _11: ActionPermit<'_, T>;
+ let mut _12: std::future::Ready<()>;
+ let mut _13: std::future::Ready<()>;
+ let mut _14: ();
+ let mut _16: ();
+ let _17: ();
+ let mut _18: std::task::Poll<()>;
+ let mut _19: std::pin::Pin<&mut std::future::Ready<()>>;
+ let mut _20: &mut std::future::Ready<()>;
+ let mut _21: &mut std::future::Ready<()>;
+ let mut _22: &mut std::task::Context<'_>;
+ let mut _23: &mut std::task::Context<'_>;
+ let mut _24: &mut std::task::Context<'_>;
+ let mut _25: isize;
+ let mut _27: !;
+ let mut _28: &mut std::task::Context<'_>;
+ let mut _29: ();
+ let mut _30: ();
+ let mut _31: &mut std::task::Context<'_>;
+ let mut _32: u32;
+ let mut _33: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _34: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _35: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _36: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _37: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _38: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _39: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ let mut _40: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6};
+ scope 8 {
+ debug self => (((*(_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6})) as variant#3).0: ActionPermit<'_, T>);
+ let mut _15: std::future::Ready<()>;
+ scope 9 {
+ debug __awaitee => (((*(_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6})) as variant#3).1: std::future::Ready<()>);
+ let _26: ();
+ scope 10 {
+ }
+ scope 11 {
+ debug result => _26;
+ }
+ }
+ scope 12 (inlined ready::<()>) {
+ debug t => _14;
+ let mut _41: std::option::Option<()>;
+ }
+ }
+ }
}
scope 3 {
+ scope 6 (inlined Pin::<&mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6}>::new_unchecked) {
+ debug pointer => _5;
+ }
}
}
+ scope 5 (inlined ActionPermit::<'_, T>::perform) {
+ debug self => _3;
+ }

bb0: {
StorageLive(_2);
StorageLive(_3);
_3 = move (_1.0: ActionPermit<'_, T>);
- _2 = ActionPermit::<'_, T>::perform(move _3) -> [return: bb1, unwind unreachable];
- }
-
- bb1: {
+ _2 = {coroutine@$DIR/inline_coroutine_body.rs:25:28: 27:6 (#0)} { self: move _3 };
StorageDead(_3);
StorageLive(_4);
StorageLive(_5);
_5 = &mut _2;
- _4 = Pin::<&mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6}>::new_unchecked(move _5) -> [return: bb2, unwind unreachable];
- }
-
- bb2: {
+ _4 = Pin::<&mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6}> { __pointer: _5 };
StorageDead(_5);
StorageLive(_6);
StorageLive(_7);
StorageLive(_8);
_8 = move _4;
StorageLive(_9);
_10 = deref_copy (_1.1: &mut std::task::Context<'_>);
_9 = &mut (*_10);
- _7 = <{async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6} as Future>::poll(move _8, move _9) -> [return: bb3, unwind unreachable];
+ StorageLive(_11);
+ StorageLive(_15);
+ StorageLive(_16);
+ StorageLive(_25);
+ StorageLive(_27);
+ StorageLive(_30);
+ StorageLive(_31);
+ StorageLive(_32);
+ StorageLive(_33);
+ StorageLive(_34);
+ StorageLive(_35);
+ StorageLive(_36);
+ StorageLive(_37);
+ StorageLive(_38);
+ StorageLive(_39);
+ StorageLive(_40);
+ _33 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ _32 = discriminant((*_33));
+ switchInt(move _32) -> [0: bb3, 1: bb13, 3: bb12, otherwise: bb8];
}

- bb3: {
+ bb1: {
+ StorageDead(_2);
+ return;
+ }
+
+ bb2: {
+ StorageDead(_40);
+ StorageDead(_39);
+ StorageDead(_38);
+ StorageDead(_37);
+ StorageDead(_36);
+ StorageDead(_35);
+ StorageDead(_34);
+ StorageDead(_33);
+ StorageDead(_32);
+ StorageDead(_31);
+ StorageDead(_30);
+ StorageDead(_27);
+ StorageDead(_25);
+ StorageDead(_16);
+ StorageDead(_15);
+ StorageDead(_11);
StorageDead(_9);
StorageDead(_8);
StorageDead(_7);
_6 = const ();
StorageDead(_6);
_0 = const ();
StorageDead(_4);
- drop(_2) -> [return: bb4, unwind unreachable];
+ drop(_2) -> [return: bb1, unwind unreachable];
}

+ bb3: {
+ _31 = move _9;
+ _34 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ _35 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ (((*_34) as variant#3).0: ActionPermit<'_, T>) = move ((*_35).0: ActionPermit<'_, T>);
+ StorageLive(_12);
+ StorageLive(_13);
+ StorageLive(_14);
+ _14 = ();
+ StorageLive(_41);
+ _41 = Option::<()>::Some(_14);
+ _13 = std::future::Ready::<()>(move _41);
+ StorageDead(_41);
+ StorageDead(_14);
+ _12 = <std::future::Ready<()> as IntoFuture>::into_future(move _13) -> [return: bb4, unwind unreachable];
+ }
+
bb4: {
- StorageDead(_2);
- return;
+ StorageDead(_13);
+ _36 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ (((*_36) as variant#3).1: std::future::Ready<()>) = move _12;
+ goto -> bb5;
+ }
+
+ bb5: {
+ StorageLive(_17);
+ StorageLive(_18);
+ StorageLive(_19);
+ StorageLive(_20);
+ StorageLive(_21);
+ _37 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ _21 = &mut (((*_37) as variant#3).1: std::future::Ready<()>);
+ _20 = &mut (*_21);
+ _19 = Pin::<&mut std::future::Ready<()>>::new_unchecked(move _20) -> [return: bb6, unwind unreachable];
+ }
+
+ bb6: {
+ StorageDead(_20);
+ StorageLive(_22);
+ StorageLive(_23);
+ StorageLive(_24);
+ _24 = _31;
+ _23 = move _24;
+ _22 = &mut (*_23);
+ StorageDead(_24);
+ _18 = <std::future::Ready<()> as Future>::poll(move _19, move _22) -> [return: bb7, unwind unreachable];
+ }
+
+ bb7: {
+ StorageDead(_22);
+ StorageDead(_19);
+ _25 = discriminant(_18);
+ switchInt(move _25) -> [0: bb10, 1: bb9, otherwise: bb8];
+ }
+
+ bb8: {
+ unreachable;
+ }
+
+ bb9: {
+ _17 = const ();
+ StorageDead(_23);
+ StorageDead(_21);
+ StorageDead(_18);
+ StorageDead(_17);
+ StorageLive(_28);
+ StorageLive(_29);
+ _29 = ();
+ _7 = Poll::<()>::Pending;
+ StorageDead(_12);
+ StorageDead(_28);
+ StorageDead(_29);
+ _38 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ discriminant((*_38)) = 3;
+ goto -> bb2;
+ }
+
+ bb10: {
+ StorageLive(_26);
+ _26 = ((_18 as Ready).0: ());
+ _30 = _26;
+ StorageDead(_26);
+ StorageDead(_23);
+ StorageDead(_21);
+ StorageDead(_18);
+ StorageDead(_17);
+ StorageDead(_12);
+ _39 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ drop((((*_39) as variant#3).0: ActionPermit<'_, T>)) -> [return: bb11, unwind unreachable];
+ }
+
+ bb11: {
+ _7 = Poll::<()>::Ready(move _30);
+ _40 = deref_copy (_8.0: &mut {async fn body@$DIR/inline_coroutine_body.rs:25:28: 27:6});
+ discriminant((*_40)) = 1;
+ goto -> bb2;
+ }
+
+ bb12: {
+ StorageLive(_12);
+ StorageLive(_28);
+ StorageLive(_29);
+ _28 = move _9;
+ StorageDead(_29);
+ _31 = move _28;
+ StorageDead(_28);
+ _16 = const ();
+ goto -> bb5;
+ }
+
+ bb13: {
+ assert(const false, "`async fn` resumed after completion") -> [success: bb13, unwind unreachable];
}
}

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