Runtime-specific panic/fail

[qinsoon]

Currently MMTk panics using Rust's built-in panic mechanism. However, this may not work with some runtimes. @wks found that in Ruby, panicking in a Rust thread does not cause the process to crash. We probably need an API similar to Collection::out_of_memory() and allow the runtime to implement panic in their own way.

mmtk-core/src/vm/collection.rs

Line 91 in a272c23

fn out_of_memory(_tls: VMThread, err_kind: AllocationError) {

See https://doc.rust-lang.org/std/panic/fn.set_hook.html.

We need to be careful that we should only capture MMTk's panic. If the runtime has other component written in Rust, we should not capture their panic.

[k-sareen]

I remember having a short conversation about this last year in the OOM PR: #535 (comment)