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use a single large catch_unwind in lang_start

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This commit is contained in:
Ralf Jung 2025-01-11 10:35:00 +01:00
parent 7e4077d06f
commit 9f7fe81d53
5 changed files with 56 additions and 24 deletions
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36
library/std/src/rt.rs
View file

@ -67,7 +67,7 @@ macro_rules! rtunwrap {
};
}
fn handle_rt_panic(e: Box<dyn Any + Send>) {
fn handle_rt_panic<T>(e: Box<dyn Any + Send>) -> T {
mem::forget(e);
rtabort!("initialization or cleanup bug");
}
@ -168,19 +168,27 @@ fn lang_start_internal(
// panic is a std implementation bug. A quite likely one too, as there isn't any way to
// prevent std from accidentally introducing a panic to these functions. Another is from
// user code from `main` or, more nefariously, as described in e.g. issue #86030.
// SAFETY: Only called once during runtime initialization.
panic::catch_unwind(move || unsafe { init(argc, argv, sigpipe) })
.unwrap_or_else(handle_rt_panic);
let ret_code = panic::catch_unwind(move || panic::catch_unwind(main).unwrap_or(101) as isize)
.map_err(move |e| {
mem::forget(e);
rtabort!("drop of the panic payload panicked");
});
panic::catch_unwind(cleanup).unwrap_or_else(handle_rt_panic);
// Guard against multiple threads calling `libc::exit` concurrently.
// See the documentation for `unique_thread_exit` for more information.
panic::catch_unwind(crate::sys::exit_guard::unique_thread_exit).unwrap_or_else(handle_rt_panic);
ret_code
//
// We use `catch_unwind` with `handle_rt_panic` instead of `abort_unwind` to make the error in
// case of a panic a bit nicer.
panic::catch_unwind(move || {
// SAFETY: Only called once during runtime initialization.
unsafe { init(argc, argv, sigpipe) };
let ret_code =
panic::catch_unwind(move || panic::catch_unwind(main).unwrap_or(101) as isize).map_err(
move |e| {
// Print a specific error when we abort due to a panicing payload destructor.
mem::forget(e);
rtabort!("drop of the panic payload panicked");
},
);
cleanup();
// Guard against multiple threads calling `libc::exit` concurrently.
// See the documentation for `unique_thread_exit` for more information.
crate::sys::exit_guard::unique_thread_exit();
ret_code
})
.unwrap_or_else(handle_rt_panic)
}
#[cfg(not(any(test, doctest)))]

10
src/tools/miri/tests/fail/tail_calls/cc-mismatch.stderr
View file

@ -15,9 +15,13 @@ LL | extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
= note: inside `std::panicking::r#try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at RUSTLIB/std/src/panic.rs:LL:CC
= note: inside closure at RUSTLIB/std/src/rt.rs:LL:CC
= note: inside `std::panicking::r#try::do_call::<{closure@std::rt::lang_start_internal::{closure#1}}, isize>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panicking::r#try::<isize, {closure@std::rt::lang_start_internal::{closure#1}}>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panic::catch_unwind::<{closure@std::rt::lang_start_internal::{closure#1}}, isize>` at RUSTLIB/std/src/panic.rs:LL:CC
= note: inside `std::panicking::r#try::do_call::<{closure@std::rt::lang_start_internal::{closure#0}::{closure#0}}, isize>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panicking::r#try::<isize, {closure@std::rt::lang_start_internal::{closure#0}::{closure#0}}>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panic::catch_unwind::<{closure@std::rt::lang_start_internal::{closure#0}::{closure#0}}, isize>` at RUSTLIB/std/src/panic.rs:LL:CC
= note: inside closure at RUSTLIB/std/src/rt.rs:LL:CC
= note: inside `std::panicking::r#try::do_call::<{closure@std::rt::lang_start_internal::{closure#0}}, std::result::Result<isize, !>>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panicking::r#try::<std::result::Result<isize, !>, {closure@std::rt::lang_start_internal::{closure#0}}>` at RUSTLIB/std/src/panicking.rs:LL:CC
= note: inside `std::panic::catch_unwind::<{closure@std::rt::lang_start_internal::{closure#0}}, std::result::Result<isize, !>>` at RUSTLIB/std/src/panic.rs:LL:CC
= note: inside `std::rt::lang_start_internal` at RUSTLIB/std/src/rt.rs:LL:CC
= note: inside `std::rt::lang_start::<()>` at RUSTLIB/std/src/rt.rs:LL:CC

6
src/tools/miri/tests/pass/backtrace/backtrace-api-v1.stderr
View file

@ -10,7 +10,11 @@ RUSTLIB/core/src/ops/function.rs:LL:CC (std::ops::function::impls::call_once)
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try::do_call)
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try)
RUSTLIB/std/src/panic.rs:LL:CC (std::panic::catch_unwind)
RUSTLIB/std/src/rt.rs:LL:CC (std::rt::lang_start_internal::{closure#1})
RUSTLIB/std/src/rt.rs:LL:CC (std::rt::lang_start_internal::{closure#0}::{closure#0})
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try::do_call)
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try)
RUSTLIB/std/src/panic.rs:LL:CC (std::panic::catch_unwind)
RUSTLIB/std/src/rt.rs:LL:CC (std::rt::lang_start_internal::{closure#0})
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try::do_call)
RUSTLIB/std/src/panicking.rs:LL:CC (std::panicking::r#try)
RUSTLIB/std/src/panic.rs:LL:CC (std::panic::catch_unwind)

14
src/tools/miri/tests/pass/backtrace/backtrace-global-alloc.stderr
View file

@ -14,7 +14,7 @@
at RUSTLIB/std/src/panicking.rs:LL:CC
7: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
8: std::rt::lang_start_internal::{closure#1}
8: std::rt::lang_start_internal::{closure#0}::{closure#0}
at RUSTLIB/std/src/rt.rs:LL:CC
9: std::panicking::r#try::do_call
at RUSTLIB/std/src/panicking.rs:LL:CC
@ -22,7 +22,15 @@
at RUSTLIB/std/src/panicking.rs:LL:CC
11: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
12: std::rt::lang_start_internal
12: std::rt::lang_start_internal::{closure#0}
at RUSTLIB/std/src/rt.rs:LL:CC
13: std::rt::lang_start
13: std::panicking::r#try::do_call
at RUSTLIB/std/src/panicking.rs:LL:CC
14: std::panicking::r#try
at RUSTLIB/std/src/panicking.rs:LL:CC
15: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
16: std::rt::lang_start_internal
at RUSTLIB/std/src/rt.rs:LL:CC
17: std::rt::lang_start
at RUSTLIB/std/src/rt.rs:LL:CC

14
src/tools/miri/tests/pass/backtrace/backtrace-std.stderr
View file

@ -22,7 +22,7 @@
at RUSTLIB/std/src/panicking.rs:LL:CC
11: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
12: std::rt::lang_start_internal::{closure#1}
12: std::rt::lang_start_internal::{closure#0}::{closure#0}
at RUSTLIB/std/src/rt.rs:LL:CC
13: std::panicking::r#try::do_call
at RUSTLIB/std/src/panicking.rs:LL:CC
@ -30,7 +30,15 @@
at RUSTLIB/std/src/panicking.rs:LL:CC
15: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
16: std::rt::lang_start_internal
16: std::rt::lang_start_internal::{closure#0}
at RUSTLIB/std/src/rt.rs:LL:CC
17: std::rt::lang_start
17: std::panicking::r#try::do_call
at RUSTLIB/std/src/panicking.rs:LL:CC
18: std::panicking::r#try
at RUSTLIB/std/src/panicking.rs:LL:CC
19: std::panic::catch_unwind
at RUSTLIB/std/src/panic.rs:LL:CC
20: std::rt::lang_start_internal
at RUSTLIB/std/src/rt.rs:LL:CC
21: std::rt::lang_start
at RUSTLIB/std/src/rt.rs:LL:CC