Enum UnwindReason 

#[non_exhaustive]
pub enum UnwindReason {
    Panic(Box<dyn Any + Send>),
    UserTrap(Box<dyn Error + Send + Sync>),
    LibTrap(Trap),
    WasmTrap {
        backtrace: Backtrace,
        pc: usize,
        signal_trap: Option<TrapCode>,
    },
}

The reason a Wasm execution is being unwound.

Shared by both trap-handler backends. WasmTrap is only produced by the OS backend (signal handler); it is never constructed in baremetal mode.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Panic(Box<dyn Any + Send>)

A panic caused by the host

UserTrap(Box<dyn Error + Send + Sync>)

A custom error triggered by the user

LibTrap(Trap)

A Trap triggered by a wasm libcall

WasmTrap

A trap caused by the Wasm generated code

Fields

backtrace: Backtrace

Native stack backtrace at the time the trap occurred

pc: usize

Program counter in generated code where the trap occurred

signal_trap: Option<TrapCode>

Optional trap code associated with the faulting signal

Implementations

impl UnwindReason

pub fn into_trap(self) -> Trap

Convert to a Trap, or resume unwinding for the Panic variant (never returns).

Trait Implementations

impl Debug for UnwindReason

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.