Add AccessListGasCost to TxContextFieldTag.

Author: silathdiir

bus-mapping/src/evm/opcodes/begin_end_tx.rs

@@ -12,7 +12,10 @@ use crate::{
 };
 use core::fmt::Debug;
 use eth_types::{
-    evm_types::{gas_utils::tx_data_gas_cost, GasCost, MAX_REFUND_QUOTIENT_OF_GAS_USED},
+    evm_types::{
+        gas_utils::{tx_access_list_gas_cost, tx_data_gas_cost},
+        GasCost, MAX_REFUND_QUOTIENT_OF_GAS_USED,
+    },
     Bytecode, ToWord, Word,
 };
 use ethers_core::utils::get_contract_address;
@@ -186,13 +189,15 @@ pub fn gen_begin_tx_steps(state: &mut CircuitInputStateRef) -> Result<ExecStep,
 
     // Calculate intrinsic gas cost
     let call_data_gas_cost = tx_data_gas_cost(&state.tx.input);
+    let access_list_gas_cost = tx_access_list_gas_cost(&state.tx.access_list);
     let intrinsic_gas_cost = if state.tx.is_create() {
         GasCost::CREATION_TX.as_u64()
     } else {
         GasCost::TX.as_u64()
     } + call_data_gas_cost
+        + access_list_gas_cost
         + init_code_gas_cost;
-    log::trace!("intrinsic_gas_cost {intrinsic_gas_cost}, call_data_gas_cost {call_data_gas_cost}, init_code_gas_cost {init_code_gas_cost}, exec_step.gas_cost {:?}", exec_step.gas_cost);
+    log::trace!("intrinsic_gas_cost {intrinsic_gas_cost}, call_data_gas_cost {call_data_gas_cost}, access_list_gas_cost {access_list_gas_cost}, init_code_gas_cost {init_code_gas_cost}, exec_step.gas_cost {:?}", exec_step.gas_cost);
     exec_step.gas_cost = GasCost(intrinsic_gas_cost);
 
     // Get code_hash of callee account

eth-types/src/evm_types.rs

@@ -205,6 +205,10 @@ impl GasCost {
     pub const PRECOMPILE_MODEXP_MIN: Self = Self(200);
     /// Base gas cost for precompile call: BLAKE2F
     pub const PRECOMPILE_BLAKE2F: Self = Self(0);
+    /// Gas cost per address in tx access list (EIP 2930)
+    pub const ACCESS_LIST_PER_ADDRESS: Self = Self(2400);
+    /// Gas cost per storage key in tx access list (EIP 2930)
+    pub const ACCESS_LIST_PER_STORAGE_KEY: Self = Self(1900);
 }
 
 impl GasCost {

eth-types/src/evm_types/gas_utils.rs

@@ -1,7 +1,7 @@
 //! Utility functions to help calculate gas
 
 use super::GasCost;
-use crate::Word;
+use crate::{AccessList, Word};
 
 /// Calculate memory expansion gas cost by current and next memory word size.
 pub fn memory_expansion_gas_cost(curr_memory_word_size: u64, next_memory_word_size: u64) -> u64 {
@@ -49,6 +49,18 @@ pub fn eip150_gas(gas_left: u64, gas_specified: Word) -> u64 {
     capped_gas
 }
 
+/// Calculate gas cost for access list (EIP 2930).
+pub fn tx_access_list_gas_cost(access_list: &Option<AccessList>) -> u64 {
+    access_list.as_ref().map_or(0, |access_list| {
+        access_list.0.len() as u64 * GasCost::ACCESS_LIST_PER_ADDRESS.as_u64()
+            + access_list
+                .0
+                .iter()
+                .fold(0, |acc, item| acc + item.storage_keys.len() as u64)
+                * GasCost::ACCESS_LIST_PER_STORAGE_KEY.as_u64()
+    })
+}
+
 /// Calculate gas cost for transaction data.
 pub fn tx_data_gas_cost(data: &[u8]) -> u64 {
     data.iter()

zkevm-circuits/src/evm_circuit/execution/begin_tx.rs

@@ -60,6 +60,8 @@ pub(crate) struct BeginTxGadget<F> {
     is_call_data_empty: IsZeroGadget<F>,
     tx_call_data_word_length: ConstantDivisionGadget<F, N_BYTES_U64>,
     tx_call_data_gas_cost: Cell<F>,
+    // The gas cost for access list (EIP 2930)
+    access_list_gas_cost: Cell<F>,
     // The gas cost for rlp-encoded bytes of unsigned tx
     tx_data_gas_cost: Cell<F>,
     reversion_info: ReversionInfo<F>,
@@ -104,7 +106,7 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
         let tx_id = cb.query_cell();
 
         let sender_nonce = cb.query_cell();
-        let [tx_nonce, tx_gas, tx_caller_address, tx_callee_address, tx_is_create, tx_call_data_length, tx_call_data_gas_cost, tx_data_gas_cost] =
+        let [tx_nonce, tx_gas, tx_caller_address, tx_callee_address, tx_is_create, tx_call_data_length, tx_call_data_gas_cost, access_list_gas_cost, tx_data_gas_cost] =
             [
                 TxContextFieldTag::Nonce,
                 TxContextFieldTag::Gas,
@@ -113,6 +115,7 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
                 TxContextFieldTag::IsCreate,
                 TxContextFieldTag::CallDataLength,
                 TxContextFieldTag::CallDataGasCost,
+                TxContextFieldTag::AccessListGasCost,
                 TxContextFieldTag::TxDataGasCost,
             ]
             .map(|field_tag| cb.tx_context(tx_id.expr(), field_tag, None));
@@ -255,6 +258,7 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
                     eth_types::evm_types::GasCost::CREATION_TX.expr(),
                     eth_types::evm_types::GasCost::TX.expr(),
                 ) + tx_call_data_gas_cost.expr()
+                    + access_list_gas_cost.expr()
                     + init_code_gas_cost,
             )
         });
@@ -689,6 +693,7 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
             is_call_data_empty,
             tx_call_data_word_length,
             tx_call_data_gas_cost,
+            access_list_gas_cost,
             tx_data_gas_cost,
             reversion_info,
             sufficient_gas_left,
@@ -916,6 +921,11 @@ impl<F: Field> ExecutionGadget<F> for BeginTxGadget<F> {
             offset,
             Value::known(F::from(tx.call_data_gas_cost)),
         )?;
+        self.access_list_gas_cost.assign(
+            region,
+            offset,
+            Value::known(F::from(tx.access_list_gas_cost)),
+        )?;
         self.tx_data_gas_cost
             .assign(region, offset, Value::known(F::from(tx.tx_data_gas_cost)))?;
         self.reversion_info.assign(

zkevm-circuits/src/table.rs

@@ -146,6 +146,8 @@ pub enum TxFieldTag {
     CallDataLength,
     /// Gas cost for transaction call data (4 for byte == 0, 16 otherwise)
     CallDataGasCost,
+    /// Gas cost for access list (EIP 2930)
+    AccessListGasCost,
     /// Gas cost of the transaction data charged in L1
     TxDataGasCost,
     /// Chain ID

zkevm-circuits/src/tx_circuit.rs

@@ -19,9 +19,9 @@ use crate::{
         BlockContextFieldTag::{CumNumTxs, NumAllTxs, NumTxs},
         BlockTable, KeccakTable, LookupTable, RlpFsmRlpTable as RlpTable, SigTable, TxFieldTag,
         TxFieldTag::{
-            BlockNumber, CallData, CallDataGasCost, CallDataLength, CallDataRLC, CalleeAddress,
-            CallerAddress, ChainID, Gas, GasPrice, IsCreate, Nonce, SigR, SigS, SigV,
-            TxDataGasCost, TxHashLength, TxHashRLC, TxSignHash, TxSignLength, TxSignRLC,
+            AccessListGasCost, BlockNumber, CallData, CallDataGasCost, CallDataLength, CallDataRLC,
+            CalleeAddress, CallerAddress, ChainID, Gas, GasPrice, IsCreate, Nonce, SigR, SigS,
+            SigV, TxDataGasCost, TxHashLength, TxHashRLC, TxSignHash, TxSignLength, TxSignRLC,
         },
         TxTable, U16Table, U8Table,
     },
@@ -331,6 +331,7 @@ impl<F: Field> SubCircuitConfig<F> for TxCircuitConfig<F> {
         is_tx_tag!(is_data, CallData);
         is_tx_tag!(is_data_length, CallDataLength);
         is_tx_tag!(is_data_gas_cost, CallDataGasCost);
+        is_tx_tag!(is_access_list_gas_cost, AccessListGasCost);
         is_tx_tag!(is_tx_gas_cost, TxDataGasCost);
         is_tx_tag!(is_data_rlc, CallDataRLC);
         is_tx_tag!(is_chain_id_expr, ChainID);
@@ -466,6 +467,7 @@ impl<F: Field> SubCircuitConfig<F> for TxCircuitConfig<F> {
                 (is_create(meta), Null),
                 (is_data_length(meta), Null),
                 (is_data_gas_cost(meta), Null),
+                (is_access_list_gas_cost(meta), Null),
                 (is_sign_hash(meta), Null),
                 (is_hash(meta), Null),
                 (is_data(meta), Null),
@@ -554,6 +556,8 @@ impl<F: Field> SubCircuitConfig<F> for TxCircuitConfig<F> {
                 },
             );
 
+            // TODO: add basic constraints for AccessListGasCost.
+
             cb.gate(meta.query_fixed(q_enable, Rotation::cur()))
         });
 
@@ -1835,6 +1839,11 @@ impl<F: Field> TxCircuitConfig<F> {
                 None,
                 Value::known(F::from(tx.call_data_gas_cost)),
             ),
+            (
+                AccessListGasCost,
+                None,
+                Value::known(F::from(tx.access_list_gas_cost)),
+            ),
             (
                 TxDataGasCost,
                 Some(RlpTableInputValue {

zkevm-circuits/src/witness/tx.rs

@@ -17,7 +17,7 @@ use crate::{
 };
 use bus_mapping::circuit_input_builder::{self, get_dummy_tx_hash, TxL1Fee};
 use eth_types::{
-    evm_types::gas_utils::tx_data_gas_cost,
+    evm_types::gas_utils::{tx_access_list_gas_cost, tx_data_gas_cost},
     geth_types::{TxType, TxType::PreEip155},
     sign_types::{
         biguint_to_32bytes_le, ct_option_ok_or, get_dummy_tx, recover_pk2, SignData, SECP256K1_Q,
@@ -67,6 +67,8 @@ pub struct Transaction {
     pub call_data_length: usize,
     /// The gas cost for transaction call data
     pub call_data_gas_cost: u64,
+    /// The gas cost for access list (EIP 2930)
+    pub access_list_gas_cost: u64,
     /// The gas cost for rlp-encoded bytes of unsigned tx
     pub tx_data_gas_cost: u64,
     /// Chain ID as per EIP-155.
@@ -226,6 +228,12 @@ impl Transaction {
                 Value::known(F::zero()),
                 Value::known(F::from(self.call_data_gas_cost)),
             ],
+            [
+                Value::known(F::from(self.id as u64)),
+                Value::known(F::from(TxContextFieldTag::AccessListGasCost as u64)),
+                Value::known(F::zero()),
+                Value::known(F::from(self.access_list_gas_cost)),
+            ],
             [
                 Value::known(F::from(self.id as u64)),
                 Value::known(F::from(TxContextFieldTag::TxDataGasCost as u64)),
@@ -858,6 +866,7 @@ impl From<MockTransaction> for Transaction {
             call_data: mock_tx.input.to_vec(),
             call_data_length: mock_tx.input.len(),
             call_data_gas_cost: tx_data_gas_cost(&mock_tx.input),
+            access_list_gas_cost: tx_access_list_gas_cost(&Some(mock_tx.access_list)),
             tx_data_gas_cost: tx_data_gas_cost(&rlp_signed),
             chain_id: mock_tx.chain_id,
             rlp_unsigned,
@@ -909,6 +918,7 @@ pub(super) fn tx_convert(
         call_data: tx.input.clone(),
         call_data_length: tx.input.len(),
         call_data_gas_cost: tx_data_gas_cost(&tx.input),
+        access_list_gas_cost: tx_access_list_gas_cost(&tx.access_list),
         tx_data_gas_cost: tx_gas_cost,
         chain_id,
         rlp_unsigned: tx.rlp_unsigned_bytes.clone(),