Full preemptive snapshot/resume.

lib/runtime-core/src/backend.rs

@@ -9,6 +9,7 @@ use crate::{
 
 use crate::{
     cache::{Artifact, Error as CacheError},
+    codegen::BkptMap,
     module::ModuleInfo,
     sys::Memory,
 };
@@ -89,6 +90,10 @@ pub trait RunnableModule: Send + Sync {
         None
     }
 
+    fn get_breakpoints(&self) -> Option<BkptMap> {
+        None
+    }
+
     /// A wasm trampoline contains the necessary data to dynamically call an exported wasm function.
     /// Given a particular signature index, we are returned a trampoline that is matched with that
     /// signature and an invoke function that can call the trampoline.