feat: nv28 skeleton

fvm/Cargo.toml

@@ -60,6 +60,7 @@ gas_calibration = []
 # The current implementation keeps it by default for backward compatibility reason.
 # See <https://github.com/filecoin-project/ref-fvm/issues/2001>
 verify-signature = []
+nv28-dev = []
 
 # Allow coverage attribute.
 [lints.rust]

fvm/src/gas/price_list.rs

@@ -1086,6 +1086,8 @@ pub fn price_list_by_network_version(network_version: NetworkVersion) -> &'stati
             &WATERMELON_PRICES
         }
         NetworkVersion::V25 | NetworkVersion::V26 | NetworkVersion::V27 => &TEEP_PRICES,
+        #[cfg(feature = "nv28-dev")]
+        NetworkVersion::V28 => &TEEP_PRICES,
         _ => panic!("network version {nv} not supported", nv = network_version),
     }
 }

fvm/src/machine/default.rs

@@ -51,8 +51,12 @@ where
     /// * `blockstore`: The underlying [blockstore][`Blockstore`] for reading/writing state.
     /// * `externs`: Client-provided ["external"][`Externs`] methods for accessing chain state.
     pub fn new(context: &MachineContext, blockstore: B, externs: E) -> anyhow::Result<Self> {
+        #[cfg(not(feature = "nv28-dev"))]
         const SUPPORTED_VERSIONS: RangeInclusive<NetworkVersion> =
             NetworkVersion::V21..=NetworkVersion::V27;
+        #[cfg(feature = "nv28-dev")]
+        const SUPPORTED_VERSIONS: RangeInclusive<NetworkVersion> =
+            NetworkVersion::V21..=NetworkVersion::V28;
 
         debug!(
             "initializing a new machine, epoch={}, base_fee={}, nv={:?}, root={}",

shared/src/version/mod.rs

@@ -69,6 +69,8 @@ impl NetworkVersion {
     pub const V26: Self = Self(26);
     /// TBD (TBD builtin-actor v17)
     pub const V27: Self = Self(27);
+    /// TBD (TBD builtin-actor v18)
+    pub const V28: Self = Self(28);
 
     pub const MAX: Self = Self(u32::MAX);