feat: add precompiles for BLS12-381 to isthmus (#2000)

Author: meyer9

crates/revm/src/optimism/handler_register.rs

@@ -310,7 +310,9 @@ pub fn reimburse_caller<SPEC: Spec, EXT, DB: Database>(
 /// Load precompiles for Optimism chain.
 #[inline]
 pub fn load_precompiles<SPEC: Spec, EXT, DB: Database>() -> ContextPrecompiles<DB> {
-    if SPEC::enabled(SpecId::GRANITE) {
+    if SPEC::enabled(SpecId::ISTHMUS) {
+        ContextPrecompiles::from_static_precompiles(optimism::precompile::isthmus())
+    } else if SPEC::enabled(SpecId::GRANITE) {
         ContextPrecompiles::from_static_precompiles(optimism::precompile::granite())
     } else if SPEC::enabled(SpecId::FJORD) {
         ContextPrecompiles::from_static_precompiles(optimism::precompile::fjord())

crates/revm/src/optimism/precompile.rs

@@ -1,4 +1,6 @@
 use once_cell::race::OnceBox;
+#[cfg(feature = "blst")]
+use revm_precompile::bls12_381;
 use revm_precompile::{secp256r1, Precompiles};
 use std::boxed::Box;
 
@@ -31,3 +33,21 @@ pub(crate) fn granite() -> &'static Precompiles {
         Box::new(precompiles)
     })
 }
+
+/// Returns precompiles for isthmus
+pub(crate) fn isthmus() -> &'static Self {
+    static INSTANCE: OnceBox<Precompiles> = OnceBox::new();
+    INSTANCE.get_or_init(|| {
+        let precompiles = Self::cancun().clone();
+
+        // Don't include BLS12-381 precompiles in no_std builds.
+        #[cfg(feature = "blst")]
+        let precompiles = {
+            let mut precompiles = precompiles;
+            precompiles.extend(bls12_381::precompiles());
+            precompiles
+        };
+
+        Box::new(precompiles)
+    })
+}