Add initial support for pluggable syscalls

fvm/Cargo.toml

@@ -41,6 +41,7 @@ minstant = "0.1.2"
 blake2b_simd = "1.0.0"
 byteorder = "1.4.3"
 static_assertions = "1.1.0"
+ambassador = "0.3.5"
 
 [dev-dependencies]
 pretty_assertions = "1.3.0"

fvm/src/engine/mod.rs

@@ -27,8 +27,7 @@ use crate::machine::limiter::MemoryLimiter;
 use crate::machine::{Machine, NetworkConfig};
 use crate::syscalls::error::Abort;
 use crate::syscalls::{
-    bind_syscalls, charge_for_exec, charge_for_init, record_init_time, update_gas_available,
-    InvocationData,
+    charge_for_exec, charge_for_init, record_init_time, update_gas_available, InvocationData,
 };
 use crate::Kernel;
 
@@ -514,10 +513,15 @@ impl Engine {
                 .expect("invalid instance cache entry"),
             Vacant(e) => &mut *e
                 .insert({
-                    let mut linker: Linker<InvocationData<K>> = Linker::new(&self.inner.engine);
+                    let mut linker = Linker::new(&self.inner.engine);
                     linker.allow_shadowing(true);
 
-                    bind_syscalls(&mut linker).map_err(Abort::Fatal)?;
+                    store
+                        .data()
+                        .kernel
+                        .bind_syscalls(&mut linker)
+                        .map_err(Abort::Fatal)?;
+
                     Box::new(Cache { linker })
                 })
                 .downcast_mut()

fvm/src/gas/price_list.rs

@@ -901,7 +901,6 @@ impl PriceList {
     }
 
     /// Returns the gas required for installing an actor.
-    #[cfg(feature = "m2-native")]
     pub fn on_install_actor(&self, wasm_size: usize) -> GasCharge {
         GasCharge::new(
             "OnInstallActor",