Prereq2 for async drop - ResumedAfterDrop panic messages

azhogin · azhogin · commit 92d848f0900d · 2025-04-06T17:02:37.000+07:00
diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs
@@ -502,6 +502,7 @@ impl<'tcx> interpret::Machine<'tcx> for CompileTimeMachine<'tcx> {
             RemainderByZero(op) => RemainderByZero(eval_to_int(op)?),
             ResumedAfterReturn(coroutine_kind) => ResumedAfterReturn(*coroutine_kind),
             ResumedAfterPanic(coroutine_kind) => ResumedAfterPanic(*coroutine_kind),
+            ResumedAfterDrop(coroutine_kind) => ResumedAfterDrop(*coroutine_kind),
             MisalignedPointerDereference { required, found } => MisalignedPointerDereference {
                 required: eval_to_int(required)?,
                 found: eval_to_int(found)?,
diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
@@ -318,6 +318,10 @@ language_item_table! {
     PanicAsyncGenFnResumedPanic, sym::panic_const_async_gen_fn_resumed_panic, panic_const_async_gen_fn_resumed_panic, Target::Fn, GenericRequirement::None;
     PanicGenFnNonePanic, sym::panic_const_gen_fn_none_panic, panic_const_gen_fn_none_panic, Target::Fn, GenericRequirement::None;
     PanicNullPointerDereference, sym::panic_null_pointer_dereference, panic_null_pointer_dereference, Target::Fn, GenericRequirement::None;
+    PanicCoroutineResumedDrop, sym::panic_const_coroutine_resumed_drop, panic_const_coroutine_resumed_drop, Target::Fn, GenericRequirement::None;
+    PanicAsyncFnResumedDrop, sym::panic_const_async_fn_resumed_drop, panic_const_async_fn_resumed_drop, Target::Fn, GenericRequirement::None;
+    PanicAsyncGenFnResumedDrop, sym::panic_const_async_gen_fn_resumed_drop, panic_const_async_gen_fn_resumed_drop, Target::Fn, GenericRequirement::None;
+    PanicGenFnNoneDrop, sym::panic_const_gen_fn_none_drop, panic_const_gen_fn_none_drop, Target::Fn, GenericRequirement::None;
     /// libstd panic entry point. Necessary for const eval to be able to catch it
     BeginPanic,              sym::begin_panic,         begin_panic_fn,             Target::Fn,             GenericRequirement::None;
 
diff --git a/compiler/rustc_middle/messages.ftl b/compiler/rustc_middle/messages.ftl
@@ -1,14 +1,20 @@
+middle_assert_async_resume_after_drop = `async fn` resumed after async drop
+
 middle_assert_async_resume_after_panic = `async fn` resumed after panicking
 
 middle_assert_async_resume_after_return = `async fn` resumed after completion
 
+middle_assert_coroutine_resume_after_drop = coroutine resumed after async drop
+
 middle_assert_coroutine_resume_after_panic = coroutine resumed after panicking
 
 middle_assert_coroutine_resume_after_return = coroutine resumed after completion
 
 middle_assert_divide_by_zero =
     attempt to divide `{$val}` by zero
 
+middle_assert_gen_resume_after_drop = `gen` fn or block cannot be further iterated on after it async dropped
+
 middle_assert_gen_resume_after_panic = `gen` fn or block cannot be further iterated on after it panicked
 
 middle_assert_misaligned_ptr_deref =
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
@@ -1066,6 +1066,7 @@ pub enum AssertKind<O> {
     RemainderByZero(O),
     ResumedAfterReturn(CoroutineKind),
     ResumedAfterPanic(CoroutineKind),
+    ResumedAfterDrop(CoroutineKind),
     MisalignedPointerDereference { required: O, found: O },
     NullPointerDereference,
 }
diff --git a/compiler/rustc_middle/src/mir/terminator.rs b/compiler/rustc_middle/src/mir/terminator.rs
@@ -208,6 +208,16 @@ impl<O> AssertKind<O> {
                 LangItem::PanicGenFnNonePanic
             }
             NullPointerDereference => LangItem::PanicNullPointerDereference,
+            ResumedAfterDrop(CoroutineKind::Coroutine(_)) => LangItem::PanicCoroutineResumedDrop,
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Async, _)) => {
+                LangItem::PanicAsyncFnResumedDrop
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _)) => {
+                LangItem::PanicAsyncGenFnResumedDrop
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) => {
+                LangItem::PanicGenFnNoneDrop
+            }
 
             BoundsCheck { .. } | MisalignedPointerDereference { .. } => {
                 bug!("Unexpected AssertKind")
@@ -298,6 +308,18 @@ impl<O> AssertKind<O> {
             ResumedAfterPanic(CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) => {
                 write!(f, "\"`gen fn` should just keep returning `None` after panicking\"")
             }
+            ResumedAfterDrop(CoroutineKind::Coroutine(_)) => {
+                write!(f, "\"coroutine resumed after async drop\"")
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Async, _)) => {
+                write!(f, "\"`async fn` resumed after async drop\"")
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _)) => {
+                write!(f, "\"`async gen fn` resumed after async drop\"")
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) => {
+                write!(f, "\"`gen fn` resumed after drop\"")
+            }
         }
     }
 
@@ -345,6 +367,19 @@ impl<O> AssertKind<O> {
                 middle_assert_coroutine_resume_after_panic
             }
             NullPointerDereference => middle_assert_null_ptr_deref,
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Async, _)) => {
+                middle_assert_async_resume_after_drop
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _)) => {
+                todo!()
+            }
+            ResumedAfterDrop(CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) => {
+                middle_assert_gen_resume_after_drop
+            }
+            ResumedAfterDrop(CoroutineKind::Coroutine(_)) => {
+                middle_assert_coroutine_resume_after_drop
+            }
+
             MisalignedPointerDereference { .. } => middle_assert_misaligned_ptr_deref,
         }
     }
@@ -377,7 +412,10 @@ impl<O> AssertKind<O> {
                 add!("left", format!("{left:#?}"));
                 add!("right", format!("{right:#?}"));
             }
-            ResumedAfterReturn(_) | ResumedAfterPanic(_) | NullPointerDereference => {}
+            ResumedAfterReturn(_)
+            | ResumedAfterPanic(_)
+            | NullPointerDereference
+            | ResumedAfterDrop(_) => {}
             MisalignedPointerDereference { required, found } => {
                 add!("required", format!("{required:#?}"));
                 add!("found", format!("{found:#?}"));
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
@@ -635,7 +635,7 @@ macro_rules! make_mir_visitor {
                     OverflowNeg(op) | DivisionByZero(op) | RemainderByZero(op) => {
                         self.visit_operand(op, location);
                     }
-                    ResumedAfterReturn(_) | ResumedAfterPanic(_) | NullPointerDereference => {
+                    ResumedAfterReturn(_) | ResumedAfterPanic(_) | NullPointerDereference | ResumedAfterDrop(_) => {
                         // Nothing to visit
                     }
                     MisalignedPointerDereference { required, found } => {
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/mir.rs b/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
@@ -494,6 +494,9 @@ impl<'tcx> Stable<'tcx> for mir::AssertMessage<'tcx> {
             AssertKind::ResumedAfterPanic(coroutine) => {
                 stable_mir::mir::AssertMessage::ResumedAfterPanic(coroutine.stable(tables))
             }
+            AssertKind::ResumedAfterDrop(coroutine) => {
+                stable_mir::mir::AssertMessage::ResumedAfterDrop(coroutine.stable(tables))
+            }
             AssertKind::MisalignedPointerDereference { required, found } => {
                 stable_mir::mir::AssertMessage::MisalignedPointerDereference {
                     required: required.stable(tables),
diff --git a/compiler/rustc_smir/src/stable_mir/mir/body.rs b/compiler/rustc_smir/src/stable_mir/mir/body.rs
@@ -267,6 +267,7 @@ pub enum AssertMessage {
     RemainderByZero(Operand),
     ResumedAfterReturn(CoroutineKind),
     ResumedAfterPanic(CoroutineKind),
+    ResumedAfterDrop(CoroutineKind),
     MisalignedPointerDereference { required: Operand, found: Operand },
     NullPointerDereference,
 }
@@ -320,6 +321,22 @@ impl AssertMessage {
                 _,
             )) => Ok("`gen fn` should just keep returning `AssertMessage::None` after panicking"),
 
+            AssertMessage::ResumedAfterDrop(CoroutineKind::Coroutine(_)) => {
+                Ok("coroutine resumed after async drop")
+            }
+            AssertMessage::ResumedAfterDrop(CoroutineKind::Desugared(
+                CoroutineDesugaring::Async,
+                _,
+            )) => Ok("`async fn` resumed after async drop"),
+            AssertMessage::ResumedAfterDrop(CoroutineKind::Desugared(
+                CoroutineDesugaring::Gen,
+                _,
+            )) => Ok("`async gen fn` resumed after async drop"),
+            AssertMessage::ResumedAfterDrop(CoroutineKind::Desugared(
+                CoroutineDesugaring::AsyncGen,
+                _,
+            )) => Ok("`gen fn` should just keep returning `AssertMessage::None` after async drop"),
+
             AssertMessage::BoundsCheck { .. } => Ok("index out of bounds"),
             AssertMessage::MisalignedPointerDereference { .. } => {
                 Ok("misaligned pointer dereference")
diff --git a/compiler/rustc_smir/src/stable_mir/mir/pretty.rs b/compiler/rustc_smir/src/stable_mir/mir/pretty.rs
@@ -312,7 +312,9 @@ fn pretty_assert_message<W: Write>(writer: &mut W, msg: &AssertMessage) -> io::R
         AssertMessage::NullPointerDereference => {
             write!(writer, "\"null pointer dereference occurred\"")
         }
-        AssertMessage::ResumedAfterReturn(_) | AssertMessage::ResumedAfterPanic(_) => {
+        AssertMessage::ResumedAfterReturn(_)
+        | AssertMessage::ResumedAfterPanic(_)
+        | AssertMessage::ResumedAfterDrop(_) => {
             write!(writer, "{}", msg.description().unwrap())
         }
     }
diff --git a/compiler/rustc_smir/src/stable_mir/mir/visit.rs b/compiler/rustc_smir/src/stable_mir/mir/visit.rs
@@ -372,7 +372,8 @@ macro_rules! make_mir_visitor {
                     }
                     AssertMessage::ResumedAfterReturn(_)
                     | AssertMessage::ResumedAfterPanic(_)
-                    | AssertMessage::NullPointerDereference => {
+                    | AssertMessage::NullPointerDereference
+                    | AssertMessage::ResumedAfterDrop(_) => {
                         //nothing to visit
                     }
                     AssertMessage::MisalignedPointerDereference { required, found } => {
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
@@ -1518,14 +1518,18 @@ symbols! {
         panic_cannot_unwind,
         panic_const_add_overflow,
         panic_const_async_fn_resumed,
+        panic_const_async_fn_resumed_drop,
         panic_const_async_fn_resumed_panic,
         panic_const_async_gen_fn_resumed,
+        panic_const_async_gen_fn_resumed_drop,
         panic_const_async_gen_fn_resumed_panic,
         panic_const_coroutine_resumed,
+        panic_const_coroutine_resumed_drop,
         panic_const_coroutine_resumed_panic,
         panic_const_div_by_zero,
         panic_const_div_overflow,
         panic_const_gen_fn_none,
+        panic_const_gen_fn_none_drop,
         panic_const_gen_fn_none_panic,
         panic_const_mul_overflow,
         panic_const_neg_overflow,
diff --git a/library/core/src/panicking.rs b/library/core/src/panicking.rs
@@ -155,56 +155,64 @@ pub const fn panic(expr: &'static str) -> ! {
 // reducing binary size impact.
 macro_rules! panic_const {
     ($($lang:ident = $message:expr,)+) => {
-        pub mod panic_const {
-            use super::*;
-
-            $(
-                /// This is a panic called with a message that's a result of a MIR-produced Assert.
-                //
-                // never inline unless panic_immediate_abort to avoid code
-                // bloat at the call sites as much as possible
-                #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
-                #[cfg_attr(feature = "panic_immediate_abort", inline)]
-                #[track_caller]
-                #[rustc_const_stable_indirect] // must follow stable const rules since it is exposed to stable
-                #[lang = stringify!($lang)]
-                pub const fn $lang() -> ! {
-                    // Use Arguments::new_const instead of format_args!("{expr}") to potentially
-                    // reduce size overhead. The format_args! macro uses str's Display trait to
-                    // write expr, which calls Formatter::pad, which must accommodate string
-                    // truncation and padding (even though none is used here). Using
-                    // Arguments::new_const may allow the compiler to omit Formatter::pad from the
-                    // output binary, saving up to a few kilobytes.
-                    panic_fmt(fmt::Arguments::new_const(&[$message]));
-                }
-            )+
-        }
+        $(
+            /// This is a panic called with a message that's a result of a MIR-produced Assert.
+            //
+            // never inline unless panic_immediate_abort to avoid code
+            // bloat at the call sites as much as possible
+            #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
+            #[cfg_attr(feature = "panic_immediate_abort", inline)]
+            #[track_caller]
+            #[rustc_const_stable_indirect] // must follow stable const rules since it is exposed to stable
+            #[lang = stringify!($lang)]
+            pub const fn $lang() -> ! {
+                // Use Arguments::new_const instead of format_args!("{expr}") to potentially
+                // reduce size overhead. The format_args! macro uses str's Display trait to
+                // write expr, which calls Formatter::pad, which must accommodate string
+                // truncation and padding (even though none is used here). Using
+                // Arguments::new_const may allow the compiler to omit Formatter::pad from the
+                // output binary, saving up to a few kilobytes.
+                panic_fmt(fmt::Arguments::new_const(&[$message]));
+            }
+        )+
     }
 }
 
 // Unfortunately this set of strings is replicated here and in a few places in the compiler in
 // slightly different forms. It's not clear if there's a good way to deduplicate without adding
 // special cases to the compiler (e.g., a const generic function wouldn't have a single definition
 // shared across crates, which is exactly what we want here).
-panic_const! {
-    panic_const_add_overflow = "attempt to add with overflow",
-    panic_const_sub_overflow = "attempt to subtract with overflow",
-    panic_const_mul_overflow = "attempt to multiply with overflow",
-    panic_const_div_overflow = "attempt to divide with overflow",
-    panic_const_rem_overflow = "attempt to calculate the remainder with overflow",
-    panic_const_neg_overflow = "attempt to negate with overflow",
-    panic_const_shr_overflow = "attempt to shift right with overflow",
-    panic_const_shl_overflow = "attempt to shift left with overflow",
-    panic_const_div_by_zero = "attempt to divide by zero",
-    panic_const_rem_by_zero = "attempt to calculate the remainder with a divisor of zero",
-    panic_const_coroutine_resumed = "coroutine resumed after completion",
-    panic_const_async_fn_resumed = "`async fn` resumed after completion",
-    panic_const_async_gen_fn_resumed = "`async gen fn` resumed after completion",
-    panic_const_gen_fn_none = "`gen fn` should just keep returning `None` after completion",
-    panic_const_coroutine_resumed_panic = "coroutine resumed after panicking",
-    panic_const_async_fn_resumed_panic = "`async fn` resumed after panicking",
-    panic_const_async_gen_fn_resumed_panic = "`async gen fn` resumed after panicking",
-    panic_const_gen_fn_none_panic = "`gen fn` should just keep returning `None` after panicking",
+pub mod panic_const {
+    use super::*;
+    panic_const! {
+        panic_const_add_overflow = "attempt to add with overflow",
+        panic_const_sub_overflow = "attempt to subtract with overflow",
+        panic_const_mul_overflow = "attempt to multiply with overflow",
+        panic_const_div_overflow = "attempt to divide with overflow",
+        panic_const_rem_overflow = "attempt to calculate the remainder with overflow",
+        panic_const_neg_overflow = "attempt to negate with overflow",
+        panic_const_shr_overflow = "attempt to shift right with overflow",
+        panic_const_shl_overflow = "attempt to shift left with overflow",
+        panic_const_div_by_zero = "attempt to divide by zero",
+        panic_const_rem_by_zero = "attempt to calculate the remainder with a divisor of zero",
+        panic_const_coroutine_resumed = "coroutine resumed after completion",
+        panic_const_async_fn_resumed = "`async fn` resumed after completion",
+        panic_const_async_gen_fn_resumed = "`async gen fn` resumed after completion",
+        panic_const_gen_fn_none = "`gen fn` should just keep returning `None` after completion",
+        panic_const_coroutine_resumed_panic = "coroutine resumed after panicking",
+        panic_const_async_fn_resumed_panic = "`async fn` resumed after panicking",
+        panic_const_async_gen_fn_resumed_panic = "`async gen fn` resumed after panicking",
+        panic_const_gen_fn_none_panic = "`gen fn` should just keep returning `None` after panicking",
+    }
+    // Separated panic constants list for async drop feature
+    // (May be joined when the corresponding lang items will be in the bootstrap)
+    #[cfg(not(bootstrap))]
+    panic_const! {
+        panic_const_coroutine_resumed_drop = "coroutine resumed after async drop",
+        panic_const_async_fn_resumed_drop = "`async fn` resumed after async drop",
+        panic_const_async_gen_fn_resumed_drop = "`async gen fn` resumed after async drop",
+        panic_const_gen_fn_none_drop = "`gen fn` resumed after async drop",
+    }
 }
 
 /// Like `panic`, but without unwinding and track_caller to reduce the impact on codesize on the caller.

Original file line number	Diff line number	Diff line change
`@@ -1066,6 +1066,7 @@ pub enum AssertKind<O> {`
`1066`	`1066`	`RemainderByZero(O),`
`1067`	`1067`	`ResumedAfterReturn(CoroutineKind),`
`1068`	`1068`	`ResumedAfterPanic(CoroutineKind),`
	`1069`	`+ ResumedAfterDrop(CoroutineKind),`
`1069`	`1070`	`MisalignedPointerDereference { required: O, found: O },`
`1070`	`1071`	`NullPointerDereference,`
`1071`	`1072`	`}`
Original file line number	Diff line number	Diff line change
`@@ -635,7 +635,7 @@ macro_rules! make_mir_visitor {`
`635`	`635`	`OverflowNeg(op) \| DivisionByZero(op) \| RemainderByZero(op) => {`
`636`	`636`	`self.visit_operand(op, location);`
`637`	`637`	`}`
`638`		`- ResumedAfterReturn(_) \| ResumedAfterPanic(_) \| NullPointerDereference => {`
	`638`	`+ ResumedAfterReturn(_) \| ResumedAfterPanic(_) \| NullPointerDereference \| ResumedAfterDrop(_) => {`
`639`	`639`	`// Nothing to visit`
`640`	`640`	`}`
`641`	`641`	`MisalignedPointerDereference { required, found } => {`
Original file line number	Diff line number	Diff line change
`@@ -312,7 +312,9 @@ fn pretty_assert_message<W: Write>(writer: &mut W, msg: &AssertMessage) -> io::R`
`312`	`312`	`AssertMessage::NullPointerDereference => {`
`313`	`313`	`write!(writer, "\"null pointer dereference occurred\"")`
`314`	`314`	`}`
`315`		`- AssertMessage::ResumedAfterReturn(_) \| AssertMessage::ResumedAfterPanic(_) => {`
	`315`	`+ AssertMessage::ResumedAfterReturn(_)`
	`316`	`+ \| AssertMessage::ResumedAfterPanic(_)`
	`317`	`+ \| AssertMessage::ResumedAfterDrop(_) => {`
`316`	`318`	`write!(writer, "{}", msg.description().unwrap())`
`317`	`319`	`}`
`318`	`320`	`}`
Original file line number	Diff line number	Diff line change
`@@ -372,7 +372,8 @@ macro_rules! make_mir_visitor {`
`372`	`372`	`}`
`373`	`373`	`AssertMessage::ResumedAfterReturn(_)`
`374`	`374`	`\| AssertMessage::ResumedAfterPanic(_)`
`375`		`- \| AssertMessage::NullPointerDereference => {`
	`375`	`+ \| AssertMessage::NullPointerDereference`
	`376`	`+ \| AssertMessage::ResumedAfterDrop(_) => {`
`376`	`377`	`//nothing to visit`
`377`	`378`	`}`
`378`	`379`	`AssertMessage::MisalignedPointerDereference { required, found } => {`