Trait wasmtime_runtime::TrapInfo

pub unsafe trait TrapInfo {
    fn as_any(&self) -> &dyn Any;
    fn is_wasm_code(&self, pc: usize) -> bool;
    fn custom_signal_handler(
        &self, 
        call: &dyn Fn(&SignalHandler<'_>) -> bool
    ) -> bool;
    fn max_wasm_stack(&self) -> usize;
}

A package of functionality needed by catch_traps to figure out what to do when handling a trap.

Note that this is an unsafe trait at least because it’s being run in the context of a synchronous signal handler, so it needs to be careful to not access too much state in answering these queries.

Required methods

fn as_any(&self) -> &dyn Any

Converts this object into an Any to dynamically check its type.

fn is_wasm_code(&self, pc: usize) -> bool

Returns whether the given program counter lies within wasm code, indicating whether we should handle a trap or not.

fn custom_signal_handler(
    &self,
    call: &dyn Fn(&SignalHandler<'_>) -> bool
) -> bool

Uses call to call a custom signal handler, if one is specified.

Returns true if call returns true, otherwise returns false.

fn max_wasm_stack(&self) -> usize

Returns the maximum size, in bytes, the wasm native stack is allowed to grow to.

Implementors