From 9491aa7b648198251be3faa751d6c108547ee54c Mon Sep 17 00:00:00 2001
From: Leo Lara <leo@leolara.me>
Date: Tue, 20 Jun 2023 22:30:10 +0800
Subject: [PATCH] Make EMPTY_CODE_HASH private

---
 bus-mapping/src/state_db.rs     | 2 +-
 zkevm-circuits/src/util/word.rs | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/bus-mapping/src/state_db.rs b/bus-mapping/src/state_db.rs
index 3ca3f762d0..84bf451109 100644
--- a/bus-mapping/src/state_db.rs
+++ b/bus-mapping/src/state_db.rs
@@ -9,7 +9,7 @@ use std::collections::{HashMap, HashSet};
 lazy_static! {
     static ref ACCOUNT_ZERO: Account = Account::zero();
     /// Hash value for empty code hash.
-    pub static ref EMPTY_CODE_HASH: Hash = CodeDB::hash(&[]);
+    static ref EMPTY_CODE_HASH: Hash = CodeDB::hash(&[]);
     /// bytes of empty code hash, in little endian order.
     pub static ref EMPTY_CODE_HASH_LE: [u8; 32] = {
         let mut bytes = EMPTY_CODE_HASH.to_fixed_bytes();
diff --git a/zkevm-circuits/src/util/word.rs b/zkevm-circuits/src/util/word.rs
index f97bd5e2a4..6b13f1a5c3 100644
--- a/zkevm-circuits/src/util/word.rs
+++ b/zkevm-circuits/src/util/word.rs
@@ -3,7 +3,7 @@
 // - Limbs: An EVN word is 256 bits. Limbs N means split 256 into N limb. For example, N = 4, each
 //   limb is 256/4 = 64 bits
 
-use bus_mapping::state_db::EMPTY_CODE_HASH;
+use bus_mapping::state_db::CodeDB;
 use eth_types::{Field, ToLittleEndian, H160};
 use gadgets::util::{not, or, Expr};
 use halo2_proofs::{
@@ -519,7 +519,7 @@ impl<F: Field> From<WordLegacy<F>> for Word32Cell<F> {
 
 /// Return the hash of the empty code as a Word<Value<F>>
 pub fn empty_code_hash_word_value<F: Field>() -> Word<Value<F>> {
-    Word::from(*EMPTY_CODE_HASH).into_value()
+    Word::from(CodeDB::empty_code_hash()).into_value()
 }
 
 // TODO unittest