EVMole is a powerful library that extracts information from Ethereum Virtual Machine (EVM) bytecode, including function selectors, arguments, state mutability, and storage layout, even for unverified contracts.
- Multi-language support: Available as JavaScript, Rust, and Python libraries.
- High accuracy and performance: Outperforms existing tools.
- Broad compatibility: Tested with both Solidity and Vyper compiled contracts.
- Lightweight: Clean codebase with minimal external dependencies.
- Unverified contract analysis: Extracts information even from unverified bytecode.
API documentation and usage examples (node, vite, webpack, parcel, esbuild)
$ npm i evmoleimport { contractInfo } from 'evmole'
const code = '0x6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256'
console.log( contractInfo(code, {selectors:true, arguments:true, stateMutability:true}) )
// {
// functions: [
// {
// selector: '2125b65b',
// bytecodeOffset: 52,
// arguments: 'uint32,address,uint224',
// stateMutability: 'pure'
// },
// ...Documentation is available on docs.rs
let code = hex::decode("6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256").unwrap();
println!("{:?}", evmole::contract_info(
evmole::ContractInfoArgs::new(&code)
.with_selectors()
.with_arguments()
.with_state_mutability()
)
);
// Contract {
// functions: Some([
// Function {
// selector: [33, 37, 182, 91],
// bytecode_offset: 52,
// arguments: Some([Uint(32), Address, Uint(224)]),
// state_mutability: Some(Pure)
// },
// ...$ pip install evmole --upgradefrom evmole import contract_info
code = '0x6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256'
print( contract_info(code, selectors=True, arguments=True, state_mutability=True) )
# Contract(
# functions=[
# Function(
# selector=2125b65b,
# bytecode_offset=52,
# arguments=uint32,address,uint224,
# state_mutability=pure),
# ...Foundy's cast uses the Rust implementation of EVMole
$ cast selectors $(cast code 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2)
0x06fdde03 view
0x095ea7b3 address,uint256 nonpayable
0x18160ddd view
0x23b872dd address,address,uint256 nonpayable
...
$ cast selectors --resolve $(cast code 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2)
0x06fdde03 view name()
0x095ea7b3 address,uint256 nonpayable approve(address,uint256)
0x18160ddd view totalSupply()
0x23b872dd address,address,uint256 nonpayable transferFrom(address,address,uint256)
...FP/FN - False Positive/False Negative errors; smaller is better
| Dataset | evmole rs · js · py | whatsabi | sevm | evmhound | heimdall | smpl | |
| largest1k 1000 addresses 24427 functions |
FP addrs | 1 🥈 | 0 🥇 | 0 🥇 | 75 | 18 | 95 |
| FN addrs | 0 🥇 | 0 🥇 | 0 🥇 | 40 | 111 | 9 | |
| FP funcs | 192 🥈 | 0 🥇 | 0 🥇 | 720 | 600 | 749 | |
| FN funcs | 0 🥇 | 0 🥇 | 0 🥇 | 191 | 147 | 12 | |
| Time | 0.4s · 0.6s · 0.4s | 2.8s | 35s(*) | 0.4s | 343s(*) | 1.6s | |
| random50k 50000 addresses 1171102 functions |
FP addrs | 1 🥇 | 43 | 1 | 693 | 3 | 4136 |
| FN addrs | 9 🥇 | 11 | 10 | 2903 | 4708 | 77 | |
| FP funcs | 3 🥇 | 51 | 3 | 10798 | 29 | 14652 | |
| FN funcs | 10 🥇 | 12 | 11 | 3538 | 6098 | 96 | |
| Time | 4.3s · 9.0s · 7.2s | 53s | 1124s(*) | 5.8s | 8572s(*) | 44s | |
| vyper 780 addresses 21244 functions |
FP addrs | 0 🥇 | 30 | 0 | 19 | 0 | 185 |
| FN addrs | 0 🥇 | 780 | 0 | 300 | 780 | 480 | |
| FP funcs | 0 🥇 | 30 | 0 | 19 | 0 | 197 | |
| FN funcs | 0 🥇 | 21244 | 0 | 8273 | 21244 | 12971 | |
| Time | 0.3s · 0.6s · 0.4s | 2.0s | 46s(*) | 0.3s | 28s(*) | 1.0s | |
Errors - when at least 1 argument is incorrect: (uint256,string) ≠ (uint256,bytes)
| Dataset | evmole rs · js · py | heimdall | smpl | |
| largest1k 24427 functions |
Errors | 14.0% 🥇 3410 |
31.1% 7593 |
58.3% 14242 |
| Time | 1.0s · 2.1s · 1.1s | 344s(*) | 0.5s | |
| random50k 1171102 functions |
Errors | 4.5% 🥇 52670 |
19.4% 227612 |
54.9% 643213 |
| Time | 20s · 49s · 24s | 8517s(*) | 8.1s | |
| vyper 21244 functions |
Errors | 48.5% 🥇 10299 |
100.0% 21244 |
56.8% 12077 |
| Time | 0.7s · 1.4s · 0.8s | 28s(*) | 0.5s | |
Errors - Results are not equal (treating view and pure as equivalent to nonpayable)
Errors strict - Results are strictly unequal (nonpayable ≠ view). Some ABIs mark pure/view functions as nonpayable, so not all strict errors indicate real issues.
| Dataset | evmole rs · js · py | whatsabi | sevm | heimdall | smpl | |
| largest1k 24427 functions |
Errors | 0.0% 🥇 0 |
68.1% 16623 |
2.1% 501 |
25.4% 6201 |
2.6% 643 |
| Errors strict | 18.6% 🥇 4555 |
79.4% 19393 |
59.0% 14417 |
54.9% 13403 |
60.9% 14864 |
|
| Time | 8.9s · 16s · 8.9s | 3.8s | 33s(*) | 339s(*) | 0.5s | |
| random50k 1160861 functions |
Errors | 0.0% 🥇 44 |
30.2% 351060 |
0.3% 3370 |
11.6% 134196 |
2.2% 24961 |
| Errors strict | 6.8% 🥇 78923 |
58.2% 675111 |
55.7% 646831 |
27.7% 321495 |
57.7% 670318 |
|
| Time | 169s · 334s · 172s | 88s | 1131s(*) | 8267s(*) | 8.2s | |
| vyper 21166 functions |
Errors | 0.5% 🥇 110 |
100.0% 21166 |
76.3% 16150 |
100.0% 21166 |
1.8% 390 |
| Errors strict | 4.0% 🥇 854 |
100.0% 21166 |
90.2% 19092 |
100.0% 21166 |
59.6% 12610 |
|
| Time | 9.5s · 13s · 9.7s | 2.1s | 38s(*) | 28s(*) | 0.5s | |
See benchmark/README.md for the methodology and commands to reproduce these results
versions: evmole v0.6.2; whatsabi v0.17.0; sevm v0.7.3; evm-hound-rs v0.1.4; heimdall-rs v0.8.4
(*): sevm and heimdall-rs are full decompilers, not limited to extracting function selectors
Short: Executes code with a custom EVM and traces CALLDATA usage.
Long: TODO
MIT