Auto merge of #115045 - RalfJung:unwind-terminate-reason, r=davidtwco

when terminating during unwinding, show the reason why

With this, the output on double-panic becomes something like that:
```
thread 'main' panicked at src/tools/miri/tests/fail/panic/double_panic.rs:15:5:
first
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at src/tools/miri/tests/fail/panic/double_panic.rs:10:9:
second
stack backtrace:
   0:           0xbe273a - std::backtrace_rs::backtrace::miri::trace_unsynchronized::<&mut [closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/miri.rs:99:5
   1:           0xbe22e6 - std::backtrace_rs::backtrace::miri::trace::<&mut [closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/miri.rs:62:14
   2:           0xbe1086 - std::backtrace_rs::backtrace::trace_unsynchronized::<[closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   3:           0xba3afd - std::sys_common::backtrace::_print_fmt
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:67:5
   4:           0xba2471 - <std::sys_common::backtrace::_print::DisplayBacktrace as std::fmt::Display>::fmt
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:44:22
   5:           0xbcf754 - core::fmt::rt::Argument::<'_>::fmt
                               at /home/r/src/rust/rustc.3/library/core/src/fmt/rt.rs:138:9
   6:           0x9b8f81 - std::fmt::write
                               at /home/r/src/rust/rustc.3/library/core/src/fmt/mod.rs:1094:17
   7:           0x21391d - <std::sys::unix::stdio::Stderr as std::io::Write>::write_fmt
                               at /home/r/src/rust/rustc.3/library/std/src/io/mod.rs:1714:15
   8:           0xba37b1 - std::sys_common::backtrace::_print
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:47:5
   9:           0xba365b - std::sys_common::backtrace::print
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:34:9
  10:           0x143c67 - std::panic_hook_with_disk_dump::{closure#1}
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:278:22
  11:           0x144187 - std::panic_hook_with_disk_dump
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:312:9
  12:           0x143659 - std::panicking::default_hook
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:239:5
  13:           0x1482a7 - std::panicking::rust_panic_with_hook
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:729:13
  14:           0x1475d5 - std::rt::begin_panic::<&str>::{closure#0}
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:650:9
  15:           0xba496a - std::sys_common::backtrace::__rust_end_short_backtrace::<[closure@std::rt::begin_panic<&str>::{closure#0}], !>
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:170:18
  16:           0x147599 - std::rt::begin_panic::<&str>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:649:12
  17:            0x31916 - <Foo as std::ops::Drop>::drop
                               at src/tools/miri/tests/fail/panic/double_panic.rs:10:9
  18:           0x1a2b5e - std::ptr::drop_in_place::<Foo> - shim(Some(Foo))
                               at /home/r/src/rust/rustc.3/library/core/src/ptr/mod.rs:497:1
  19:            0x202bf - main
                               at src/tools/miri/tests/fail/panic/double_panic.rs:16:1
  20:            0xcc6a8 - <fn() as std::ops::FnOnce<()>>::call_once - shim(fn())
                               at /home/r/src/rust/rustc.3/library/core/src/ops/function.rs:250:5
  21:           0xba47d9 - std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:154:18
  22:           0x141a6a - std::rt::lang_start::<()>::{closure#0}
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:166:18
  23:            0xcca18 - std::ops::function::impls::<impl std::ops::FnOnce<()> for &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>::call_once
                               at /home/r/src/rust/rustc.3/library/core/src/ops/function.rs:284:13
  24:           0x146469 - std::panicking::try::do_call::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:524:40
  25:           0x145e09 - std::panicking::try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:488:19
  26:            0x7b0ac - std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
                               at /home/r/src/rust/rustc.3/library/std/src/panic.rs:142:14
  27:           0x14189b - std::rt::lang_start_internal::{closure#2}
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:148:48
  28:           0x146481 - std::panicking::try::do_call::<[closure@std::rt::lang_start_internal::{closure#2}], isize>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:524:40
  29:           0x145e2c - std::panicking::try::<isize, [closure@std::rt::lang_start_internal::{closure#2}]>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:488:19
  30:            0x7b0d5 - std::panic::catch_unwind::<[closure@std::rt::lang_start_internal::{closure#2}], isize>
                               at /home/r/src/rust/rustc.3/library/std/src/panic.rs:142:14
  31:           0x1418b0 - std::rt::lang_start_internal
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:148:20
  32:           0x141a97 - std::rt::lang_start::<()>
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:165:17
thread 'main' panicked at /home/r/src/rust/rustc.3/library/core/src/panicking.rs:126:5:
panic in a destructor during cleanup
stack backtrace:
   0:           0xe9f6d7 - std::backtrace_rs::backtrace::miri::trace_unsynchronized::<&mut [closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/miri.rs:99:5
   1:           0xe9f27d - std::backtrace_rs::backtrace::miri::trace::<&mut [closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/miri.rs:62:14
   2:           0xe9e016 - std::backtrace_rs::backtrace::trace_unsynchronized::<[closure@std::sys_common::backtrace::_print_fmt::{closure#1}]>
                               at /home/r/src/rust/rustc.3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   3:           0xba3afd - std::sys_common::backtrace::_print_fmt
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:67:5
   4:           0xba2471 - <std::sys_common::backtrace::_print::DisplayBacktrace as std::fmt::Display>::fmt
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:44:22
   5:           0xbcf754 - core::fmt::rt::Argument::<'_>::fmt
                               at /home/r/src/rust/rustc.3/library/core/src/fmt/rt.rs:138:9
   6:           0x9b8f81 - std::fmt::write
                               at /home/r/src/rust/rustc.3/library/core/src/fmt/mod.rs:1094:17
   7:           0x4d0895 - <std::sys::unix::stdio::Stderr as std::io::Write>::write_fmt
                               at /home/r/src/rust/rustc.3/library/std/src/io/mod.rs:1714:15
   8:           0xba37b1 - std::sys_common::backtrace::_print
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:47:5
   9:           0xba365b - std::sys_common::backtrace::print
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:34:9
  10:           0x400bd4 - std::panic_hook_with_disk_dump::{closure#1}
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:278:22
  11:           0x144187 - std::panic_hook_with_disk_dump
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:312:9
  12:           0x143659 - std::panicking::default_hook
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:239:5
  13:           0x1482a7 - std::panicking::rust_panic_with_hook
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:729:13
  14:           0x40403b - std::panicking::begin_panic_handler::{closure#0}
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:619:13
  15:           0xe618b3 - std::sys_common::backtrace::__rust_end_short_backtrace::<[closure@std::panicking::begin_panic_handler::{closure#0}], !>
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:170:18
  16:           0x403fc8 - std::panicking::begin_panic_handler
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:617:5
  17:           0xee23e9 - core::panicking::panic_nounwind_fmt
                               at /home/r/src/rust/rustc.3/library/core/src/panicking.rs:96:14
  18:           0xee29e6 - core::panicking::panic_nounwind
                               at /home/r/src/rust/rustc.3/library/core/src/panicking.rs:126:5
  19:           0xee365e - core::panicking::panic_in_cleanup
                               at /home/r/src/rust/rustc.3/library/core/src/panicking.rs:206:5
  20:            0x2028a - main
                               at src/tools/miri/tests/fail/panic/double_panic.rs:13:1
  21:           0x3895ee - <fn() as std::ops::FnOnce<()>>::call_once - shim(fn())
                               at /home/r/src/rust/rustc.3/library/core/src/ops/function.rs:250:5
  22:           0xe61725 - std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>
                               at /home/r/src/rust/rustc.3/library/std/src/sys_common/backtrace.rs:154:18
  23:           0x3fe9aa - std::rt::lang_start::<()>::{closure#0}
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:166:18
  24:           0x389962 - std::ops::function::impls::<impl std::ops::FnOnce<()> for &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>::call_once
                               at /home/r/src/rust/rustc.3/library/core/src/ops/function.rs:284:13
  25:           0x4033b9 - std::panicking::try::do_call::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:524:40
  26:           0x402d58 - std::panicking::try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:488:19
  27:           0x337ff7 - std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
                               at /home/r/src/rust/rustc.3/library/std/src/panic.rs:142:14
  28:           0x3fe7e7 - std::rt::lang_start_internal::{closure#2}
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:148:48
  29:           0x4033d6 - std::panicking::try::do_call::<[closure@std::rt::lang_start_internal::{closure#2}], isize>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:524:40
  30:           0x402d7f - std::panicking::try::<isize, [closure@std::rt::lang_start_internal::{closure#2}]>
                               at /home/r/src/rust/rustc.3/library/std/src/panicking.rs:488:19
  31:           0x338028 - std::panic::catch_unwind::<[closure@std::rt::lang_start_internal::{closure#2}], isize>
                               at /home/r/src/rust/rustc.3/library/std/src/panic.rs:142:14
  32:           0x1418b0 - std::rt::lang_start_internal
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:148:20
  33:           0x3fe9dc - std::rt::lang_start::<()>
                               at /home/r/src/rust/rustc.3/library/std/src/rt.rs:165:17
thread caused non-unwinding panic. aborting.
```
If we also land https://github.com/rust-lang/rust/pull/115020, the 2nd backtrace disappears, hopefully making the "panic in a destructor during cleanup" easier to see.

Fixes https://github.com/rust-lang/rust/issues/114954.

4 files changed, 18 insertions, 14 deletions

diff --git a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
index 43523faa236..17233058c9c 100644
--- a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
+++ b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
@@ -292,7 +292,7 @@ fn check_terminator<'tcx>(
         | TerminatorKind::Goto { .. }
         | TerminatorKind::Return
         | TerminatorKind::UnwindResume
-        | TerminatorKind::UnwindTerminate
+        | TerminatorKind::UnwindTerminate(_)
         | TerminatorKind::Unreachable => Ok(()),
         TerminatorKind::Drop { place, .. } => {
             if !is_ty_const_destruct(tcx, place.ty(&body.local_decls, tcx).ty, body) {
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index a2c828701e5..dd4c59fdff5 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -3622,26 +3622,30 @@ impl<'test> TestCx<'test> {
         let expected_stderr = self.load_expected_output(stderr_kind);
         let expected_stdout = self.load_expected_output(stdout_kind);
 
-        let normalized_stdout = match output_kind {
+        let mut normalized_stdout =
+            self.normalize_output(&proc_res.stdout, &self.props.normalize_stdout);
+        match output_kind {
             TestOutput::Run if self.config.remote_test_client.is_some() => {
                 // When tests are run using the remote-test-client, the string
                 // 'uploaded "$TEST_BUILD_DIR/<test_executable>, waiting for result"'
                 // is printed to stdout by the client and then captured in the ProcRes,
-                // so it needs to be removed when comparing the run-pass test execution output
+                // so it needs to be removed when comparing the run-pass test execution output.
                 static REMOTE_TEST_RE: Lazy<Regex> = Lazy::new(|| {
                     Regex::new(
                         "^uploaded \"\\$TEST_BUILD_DIR(/[[:alnum:]_\\-.]+)+\", waiting for result\n"
                     )
                     .unwrap()
                 });
-                REMOTE_TEST_RE
-                    .replace(
-                        &self.normalize_output(&proc_res.stdout, &self.props.normalize_stdout),
-                        "",
-                    )
-                    .to_string()
+                normalized_stdout = REMOTE_TEST_RE.replace(&normalized_stdout, "").to_string();
+                // When there is a panic, the remote-test-client also prints "died due to signal";
+                // that needs to be removed as well.
+                static SIGNAL_DIED_RE: Lazy<Regex> =
+                    Lazy::new(|| Regex::new("^died due to signal [0-9]+\n").unwrap());
+                normalized_stdout = SIGNAL_DIED_RE.replace(&normalized_stdout, "").to_string();
+                // FIXME: it would be much nicer if we could just tell the remote-test-client to not
+                // print these things.
             }
-            _ => self.normalize_output(&proc_res.stdout, &self.props.normalize_stdout),
+            _ => {}
         };
 
         let stderr = if explicit_format {
diff --git a/src/tools/miri/src/machine.rs b/src/tools/miri/src/machine.rs
index 550c9650fb3..17cfcbb2018 100644
--- a/src/tools/miri/src/machine.rs
+++ b/src/tools/miri/src/machine.rs
@@ -975,9 +975,9 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
         ecx.start_panic_nounwind(msg)
     }
 
-    fn unwind_terminate(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
+    fn unwind_terminate(ecx: &mut InterpCx<'mir, 'tcx, Self>, reason: mir::UnwindTerminateReason) -> InterpResult<'tcx> {
         // Call the lang item.
-        let panic = ecx.tcx.lang_items().panic_cannot_unwind().unwrap();
+        let panic = ecx.tcx.lang_items().get(reason.lang_item()).unwrap();
         let panic = ty::Instance::mono(ecx.tcx.tcx, panic);
         ecx.call_function(
             panic,
diff --git a/src/tools/miri/tests/fail/panic/double_panic.stderr b/src/tools/miri/tests/fail/panic/double_panic.stderr
index 25c9a7c44bc..9efba031250 100644
--- a/src/tools/miri/tests/fail/panic/double_panic.stderr
+++ b/src/tools/miri/tests/fail/panic/double_panic.stderr
@@ -5,7 +5,7 @@ thread 'main' panicked at $DIR/double_panic.rs:LL:CC:
 second
 stack backtrace:
 thread 'main' panicked at RUSTLIB/core/src/panicking.rs:LL:CC:
-panic in a function that cannot unwind
+panic in a destructor during cleanup
 stack backtrace:
 thread caused non-unwinding panic. aborting.
 error: abnormal termination: the program aborted execution
@@ -20,7 +20,7 @@ LL |     ABORT();
    = note: inside `std::sys_common::backtrace::__rust_end_short_backtrace::<[closure@std::panicking::begin_panic_handler::{closure#0}], !>` at RUSTLIB/std/src/sys_common/backtrace.rs:LL:CC
    = note: inside `std::panicking::begin_panic_handler` at RUSTLIB/std/src/panicking.rs:LL:CC
    = note: inside `core::panicking::panic_nounwind` at RUSTLIB/core/src/panicking.rs:LL:CC
-   = note: inside `core::panicking::panic_cannot_unwind` at RUSTLIB/core/src/panicking.rs:LL:CC
+   = note: inside `core::panicking::panic_in_cleanup` at RUSTLIB/core/src/panicking.rs:LL:CC
 note: inside `main`
   --> $DIR/double_panic.rs:LL:CC
    |