From 4116da557a7563199a5b4ec33cc6adf628b761e5 Mon Sep 17 00:00:00 2001
From: Rohit Narurkar <rohit.narurkar@proton.me>
Date: Mon, 9 Sep 2024 11:31:12 +0100
Subject: [PATCH] chore: add sanity check to assert post-curie traces

---
 bus-mapping/src/evm/opcodes/begin_end_tx.rs   | 87 ++++++++++---------
 .../src/evm_circuit/execution/begin_tx.rs     |  2 +-
 2 files changed, 47 insertions(+), 42 deletions(-)

diff --git a/bus-mapping/src/evm/opcodes/begin_end_tx.rs b/bus-mapping/src/evm/opcodes/begin_end_tx.rs
index 39d3f5f5e2..aace0978d4 100644
--- a/bus-mapping/src/evm/opcodes/begin_end_tx.rs
+++ b/bus-mapping/src/evm/opcodes/begin_end_tx.rs
@@ -95,7 +95,7 @@ pub fn gen_begin_tx_steps(state: &mut CircuitInputStateRef) -> Result<Vec<ExecSt
             }
         }
     } else {
-        // else, add 3 ( or 6 after curie) RW read operations for transaction L1 fee.
+        // else, add 6 RW read operations for transaction L1 fee.
         gen_tx_l1_fee_ops(state, &mut exec_step)?;
     }
 
@@ -727,7 +727,7 @@ fn write_tx_receipt(
     Ok(())
 }
 
-// Add 3(or 6 after curie) RW read operations for transaction L1 fee.
+// Add 6 RW read operations for transaction L1 fee.
 fn gen_tx_l1_fee_ops(
     state: &mut CircuitInputStateRef,
     exec_step: &mut ExecStep,
@@ -786,47 +786,52 @@ fn gen_tx_l1_fee_ops(
         ),
     )?;
 
-    // curie operations
+    // Sanity check: we do not support pre-curie blocks as of <https://github.com/scroll-tech/zkevm-circuits/pull/1415>
+    //
+    // We expect a post-curie block.
     let chain_id = state.block.chain_id;
     let block_number = state.tx.block_num;
-    if is_curie_enabled(chain_id, block_number) {
-        state.push_op(
-            exec_step,
-            RW::READ,
-            StorageOp::new(
-                *l1_gas_price_oracle::ADDRESS,
-                *l1_gas_price_oracle::L1_BLOB_BASEFEE_SLOT,
-                l1_blob_basefee,
-                l1_blob_basefee,
-                tx_id,
-                l1_blob_basefee_committed,
-            ),
-        )?;
-        state.push_op(
-            exec_step,
-            RW::READ,
-            StorageOp::new(
-                *l1_gas_price_oracle::ADDRESS,
-                *l1_gas_price_oracle::COMMIT_SCALAR_SLOT,
-                commit_scalar,
-                commit_scalar,
-                tx_id,
-                commit_scalar_committed,
-            ),
-        )?;
-        state.push_op(
-            exec_step,
-            RW::READ,
-            StorageOp::new(
-                *l1_gas_price_oracle::ADDRESS,
-                *l1_gas_price_oracle::BLOB_SCALAR_SLOT,
-                blob_scalar,
-                blob_scalar,
-                tx_id,
-                blob_scalar_committed,
-            ),
-        )?;
-    }
+    debug_assert!(
+        is_curie_enabled(chain_id, block_number),
+        "block {block_number} is pre-curie",
+    );
+
+    state.push_op(
+        exec_step,
+        RW::READ,
+        StorageOp::new(
+            *l1_gas_price_oracle::ADDRESS,
+            *l1_gas_price_oracle::L1_BLOB_BASEFEE_SLOT,
+            l1_blob_basefee,
+            l1_blob_basefee,
+            tx_id,
+            l1_blob_basefee_committed,
+        ),
+    )?;
+    state.push_op(
+        exec_step,
+        RW::READ,
+        StorageOp::new(
+            *l1_gas_price_oracle::ADDRESS,
+            *l1_gas_price_oracle::COMMIT_SCALAR_SLOT,
+            commit_scalar,
+            commit_scalar,
+            tx_id,
+            commit_scalar_committed,
+        ),
+    )?;
+    state.push_op(
+        exec_step,
+        RW::READ,
+        StorageOp::new(
+            *l1_gas_price_oracle::ADDRESS,
+            *l1_gas_price_oracle::BLOB_SCALAR_SLOT,
+            blob_scalar,
+            blob_scalar,
+            tx_id,
+            blob_scalar_committed,
+        ),
+    )?;
 
     Ok(())
 }
diff --git a/zkevm-circuits/src/evm_circuit/execution/begin_tx.rs b/zkevm-circuits/src/evm_circuit/execution/begin_tx.rs
index e39dd0a1fa..be786f8da2 100644
--- a/zkevm-circuits/src/evm_circuit/execution/begin_tx.rs
+++ b/zkevm-circuits/src/evm_circuit/execution/begin_tx.rs
@@ -858,7 +858,7 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
         //          if scroll:
         //              KeccakCodeHash
         // else:
-        //      3 or 6 l1 fee rw
+        //      6 l1 fee rw
         // RwCounterEndOfReversion
         // IsPersistent
         // IsSuccess