From ea303b4d8b4b5acf4b9cb57c99e718f97b5a223b Mon Sep 17 00:00:00 2001
From: Yorick Peterse <git@yorickpeterse.com>
Date: Sat, 22 Oct 2022 20:44:50 +0200
Subject: [PATCH] Save instruction pointer for async messages

This ensures that if we panic due to sending a message to the current
process, we print the correct stacktrace; instead of trying to get the
location of the instruction _after_ the send.

This fixes https://gitlab.com/inko-lang/inko/-/issues/294.

Changelog: fixed
---
 vm/src/machine.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/vm/src/machine.rs b/vm/src/machine.rs
index 14e487d08..d77ca1903 100644
--- a/vm/src/machine.rs
+++ b/vm/src/machine.rs
@@ -570,6 +570,11 @@ impl<'a> Machine<'a> {
                     let reg = ins.arg(0);
                     let rec = state.context.get_register(ins.arg(1));
                     let method = ins.arg(2);
+
+                    // We save in case of a panic, otherwise we may be missing
+                    // stack frames in the resulting stack trace.
+                    state.save();
+
                     let res = process::send_async_message(
                         self.state, thread, process, task, rec, method,
                     )?;