From ab54cd5cc652f49f8d7088f6551de1f351c830af Mon Sep 17 00:00:00 2001
From: Alexey Shekhirin <a.shekhirin@gmail.com>
Date: Wed, 8 May 2024 15:28:27 +0100
Subject: [PATCH] feat(precompile): add Prague hardfork specification (#1387)

---
 crates/precompile/src/lib.rs | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/crates/precompile/src/lib.rs b/crates/precompile/src/lib.rs
index 4dc6cae518..7903d38b27 100644
--- a/crates/precompile/src/lib.rs
+++ b/crates/precompile/src/lib.rs
@@ -63,6 +63,7 @@ impl Precompiles {
             PrecompileSpecId::ISTANBUL => Self::istanbul(),
             PrecompileSpecId::BERLIN => Self::berlin(),
             PrecompileSpecId::CANCUN => Self::cancun(),
+            PrecompileSpecId::PRAGUE => Self::prague(),
             PrecompileSpecId::LATEST => Self::latest(),
         }
     }
@@ -154,9 +155,21 @@ impl Precompiles {
         })
     }
 
+    /// Returns precompiles for Prague spec.
+    pub fn prague() -> &'static Self {
+        static INSTANCE: OnceBox<Precompiles> = OnceBox::new();
+        INSTANCE.get_or_init(|| {
+            let precompiles = Self::cancun().clone();
+            // EIP-2537: Precompile for BLS12-381 curve operations
+            // TODO(alexey): add BLS12-381 precompiles
+            // precompiles.extend(bls12_381::precompiles());
+            Box::new(precompiles)
+        })
+    }
+
     /// Returns the precompiles for the latest spec.
     pub fn latest() -> &'static Self {
-        Self::cancun()
+        Self::prague()
     }
 
     /// Returns an iterator over the precompiles addresses.
@@ -229,6 +242,7 @@ pub enum PrecompileSpecId {
     ISTANBUL,
     BERLIN,
     CANCUN,
+    PRAGUE,
     LATEST,
 }
 
@@ -243,7 +257,8 @@ impl PrecompileSpecId {
             BYZANTIUM | CONSTANTINOPLE | PETERSBURG => Self::BYZANTIUM,
             ISTANBUL | MUIR_GLACIER => Self::ISTANBUL,
             BERLIN | LONDON | ARROW_GLACIER | GRAY_GLACIER | MERGE | SHANGHAI => Self::BERLIN,
-            CANCUN | PRAGUE => Self::CANCUN,
+            CANCUN => Self::CANCUN,
+            PRAGUE => Self::PRAGUE,
             LATEST => Self::LATEST,
             #[cfg(feature = "optimism")]
             BEDROCK | REGOLITH | CANYON => Self::BERLIN,