add predeployed ERC20 token for benchmarking

- Add BenchmarkToken contract (BENCH) predeployed at 0xB0B5...
- Include compiled bytecode and storage in genesis.json
- Fix ToWei function decimal conversion bug
- EWOQ address holds 100M token supply

Author: owenwahlgren

contracts/BenchmarkToken.sol

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+/**
+ * @title BenchmarkToken
+ * @dev Minimal ERC20 implementation for benchmarking. No constructor needed as state is set in genesis.
+ * Storage layout:
+ *   - Slot 0: _balances mapping
+ *   - Slot 1: _allowances mapping
+ *   - Slot 2: _totalSupply
+ */
+contract BenchmarkToken {
+    mapping(address => uint256) private _balances;
+    mapping(address => mapping(address => uint256)) private _allowances;
+    uint256 private _totalSupply;
+
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    function name() public pure returns (string memory) {
+        return "Benchmark Token";
+    }
+
+    function symbol() public pure returns (string memory) {
+        return "BENCH";
+    }
+
+    function decimals() public pure returns (uint8) {
+        return 18;
+    }
+
+    function totalSupply() public view returns (uint256) {
+        return _totalSupply;
+    }
+
+    function balanceOf(address account) public view returns (uint256) {
+        return _balances[account];
+    }
+
+    function transfer(address to, uint256 amount) public returns (bool) {
+        address owner = msg.sender;
+        _balances[owner] -= amount;
+        _balances[to] += amount;
+        emit Transfer(owner, to, amount);
+        return true;
+    }
+
+    function allowance(address owner, address spender) public view returns (uint256) {
+        return _allowances[owner][spender];
+    }
+
+    function approve(address spender, uint256 amount) public returns (bool) {
+        _allowances[msg.sender][spender] = amount;
+        emit Approval(msg.sender, spender, amount);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint256 amount) public returns (bool) {
+        _allowances[from][msg.sender] -= amount;
+        _balances[from] -= amount;
+        _balances[to] += amount;
+        emit Transfer(from, to, amount);
+        return true;
+    }
+}

genesis.json

@@ -15,6 +15,14 @@
   "alloc": {
     "8db97C7cEcE249c2b98bDC0226Cc4C2A57BF52FC": {
       "balance": "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
+    },
+    "B0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5": {
+      "balance": "0x0",
+      "code": "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",
+      "storage": {
+        "0x8752f2ce489c60adfebb82af1ee397b7cda0e7af19fe4d57af54dd0cbf417866": "0x00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000",
+        "0x0000000000000000000000000000000000000000000000000000000000000002": "0x00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000"
+      }
     }
   },
   "nonce": "0x0",

internal/bombard/fund.go

@@ -20,7 +20,7 @@ const EwoqAddress = "0x8db97C7cEcE249c2b98bDC0226Cc4C2A57BF52FC"
 
 // PredeployedTokenAddress is the address of the predeployed ERC20 "Benchmark Token" (BENCH)
 // in the default subnet-evm genesis. The ewoq address holds the entire 100M token supply.
-const PredeployedTokenAddress = "0x0200000000000000000000000000000000000001"
+const PredeployedTokenAddress = "0xB0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5B0B5"
 
 func fundAccounts(client *ethclient.Client, listener *TxListener, keys []*Key) error {
 	ewoqKey, err := crypto.HexToECDSA(ewoqPrivateKey)

internal/bombard/utils.go

@@ -1,34 +1,18 @@
 package bombard
 
 import (
-	"fmt"
 	"math/big"
-	"strings"
 
 	"github.com/ava-labs/libevm/common"
 )
 
-// ToWei converts a float amount to wei (18 decimals).
+// ToWei converts a whole token amount to wei (18 decimals).
+// E.g., ToWei(100) returns 100 * 10^18.
 func ToWei(amount float64) *big.Int {
-	const decimals = 18
-
-	wei := new(big.Int)
-
-	// Convert float to string with maximum precision
-	amountStr := fmt.Sprintf("%.18f", amount)
-
-	// Remove decimal point and trailing zeros
-	amountStr = strings.Replace(amountStr, ".", "", 1)
-	amountStr = strings.TrimRight(amountStr, "0")
-
-	// Parse string to big.Int
-	wei.SetString(amountStr, 10)
-
-	// Adjust for decimals
-	multiplier := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(decimals)), nil)
-	wei.Mul(wei, multiplier)
-
-	return wei
+	// For whole numbers, simply multiply by 10^18
+	multiplier := new(big.Int).Exp(big.NewInt(10), big.NewInt(18), nil)
+	result := new(big.Int).SetInt64(int64(amount))
+	return result.Mul(result, multiplier)
 }
 
 // ERC20TransferSelector is the function selector for transfer(address,uint256)