26 lines
890 B
Rust
26 lines
890 B
Rust
//! Unwinding panics for Miri.
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use alloc::boxed::Box;
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use core::any::Any;
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// The type of the payload that the Miri engine propagates through unwinding for us.
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// Must be pointer-sized.
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type Payload = Box<Box<dyn Any + Send>>;
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extern "Rust" {
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/// Miri-provided extern function to begin unwinding.
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fn miri_start_panic(payload: *mut u8) -> !;
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}
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pub unsafe fn panic(payload: Box<dyn Any + Send>) -> u32 {
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// The payload we pass to `miri_start_panic` will be exactly the argument we get
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// in `cleanup` below. So we just box it up once, to get something pointer-sized.
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let payload_box: Payload = Box::new(payload);
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miri_start_panic(Box::into_raw(payload_box) as *mut u8)
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}
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pub unsafe fn cleanup(payload_box: *mut u8) -> Box<dyn Any + Send> {
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// Recover the underlying `Box`.
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let payload_box: Payload = Box::from_raw(payload_box as *mut _);
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*payload_box
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}
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