EVMole is a powerful library that extracts information from Ethereum Virtual Machine (EVM) bytecode, including function selectors, arguments, and state mutability, even for unverified contracts.
- Multi-language support: Available as JavaScript, Rust, and Python libraries.
- High accurancy 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 { functionSelectors, functionArguments, functionStateMutability } from 'evmole'
const code = '0x6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256'
console.log(functionSelectors(code)); // [ '2125b65b', 'b69ef8a8' ]
console.log(functionArguments(code, '2125b65b')); // 'uint32,address,uint224'
console.log(functionStateMutability(code, '2125b65b')); // 'pure'Documentation is available on docs.rs
let code = hex::decode("6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256").unwrap();
println!("{:x?} | {} | {}",
evmole::function_selectors(&code, 0),
evmole::function_arguments(&code, &[0x21, 0x25, 0xb6, 0x5b], 0),
evmole::function_state_mutability(&code, &[0x21, 0x25, 0xb6, 0x5b], 0),
);
// [[21, 25, b6, 5b], [b6, 9e, f8, a8]] | uint32,address,uint224 | pure$ pip install evmole --upgradefrom evmole import function_selectors, function_arguments, function_state_mutability
code = '0x6080604052348015600e575f80fd5b50600436106030575f3560e01c80632125b65b146034578063b69ef8a8146044575b5f80fd5b6044603f3660046046565b505050565b005b5f805f606084860312156057575f80fd5b833563ffffffff811681146069575f80fd5b925060208401356001600160a01b03811681146083575f80fd5b915060408401356001600160e01b0381168114609d575f80fd5b80915050925092509256'
print(function_selectors(code)) # ['2125b65b', 'b69ef8a8']
print(function_arguments(code, '2125b65b')) # uint32,address,uint224
print(function_state_mutability(code, '2125b65b')) # pureFoundy's cast uses the Rust implementation of EVMole
$ cast selectors $(cast code 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2)
0x06fdde03
0x095ea7b3 address,uint256
0x18160ddd
0x23b872dd address,address,uint256
...
$ cast selectors --resolve $(cast code 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2)
0x06fdde03 name()
0x095ea7b3 address,uint256 approve(address,uint256)
0x18160ddd totalSupply()
0x23b872dd address,address,uint256 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 · 0.8s · 0.6s | 2.9s | 38s(*) | 0.5s | 341s(*) | 1.8s | |
| random50k 50000 addresses 1171102 functions |
FP addrs | 1 🥇 | 43 | 1 | 693 | 3 | 4136 |
| FN addrs | 9 🥇 | 11 | 36 | 2903 | 4708 | 77 | |
| FP funcs | 3 🥇 | 51 | 3 | 10798 | 29 | 14652 | |
| FN funcs | 10 🥇 | 12 | 587 | 3538 | 6098 | 96 | |
| Time | 4.5s · 12s · 10s | 49s | 1427s(*) | 5.8s | 8576s(*) | 49s | |
| vyper 780 addresses 21244 functions |
FP addrs | 0 🥇 | 30 | 0 | 19 | 0 | 185 |
| FN addrs | 0 🥇 | 780 | 21 | 300 | 780 | 480 | |
| FP funcs | 0 🥇 | 30 | 0 | 19 | 0 | 197 | |
| FN funcs | 0 🥇 | 21244 | 336 | 8273 | 21244 | 12971 | |
| Time | 0.4s · 0.7s · 0.5s | 2.2s | 60s(*) | 0.4s | 27s(*) | 1.1s | |
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% 🥇 3417 |
31.1% 7593 |
58.3% 14242 |
| Time | 1.0s · 8.3s · 3.5s | 342s(*) | 0.7s | |
| random50k 1171102 functions |
Errors | 4.5% 🥇 52777 |
19.4% 227612 |
54.9% 643213 |
| Time | 23s · 263s · 104s | 8544s(*) | 9.7s | |
| vyper 21244 functions |
Errors | 49.6% 🥇 10544 |
100.0% 21244 |
56.8% 12077 |
| Time | 0.7s · 5.2s · 2.2s | 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 | 19.3% 🥇 4718 |
79.3% 19370 |
59.0% 14417 |
54.9% 13403 |
60.9% 14864 |
|
| Time | 7.9s · 17s · 10s | 3.7s | 37s(*) | 339s(*) | 0.7s | |
| random50k 1160861 functions |
Errors | 0.0% 🥇 35 |
30.2% 351060 |
0.3% 3887 |
11.6% 134195 |
2.2% 24961 |
| Errors strict | 6.8% 🥇 78676 |
58.1% 674922 |
55.7% 647070 |
27.7% 321494 |
57.7% 670318 |
|
| Time | 226s · 523s · 309s | 80s | 1709s(*) | 8151s(*) | 9.4s | |
| vyper 21166 functions |
Errors | 0.5% 🥇 110 |
100.0% 21166 |
77.8% 16462 |
100.0% 21166 |
1.8% 390 |
| Errors strict | 11.4% 🥇 2410 |
100.0% 21166 |
91.0% 19253 |
100.0% 21166 |
59.6% 12610 |
|
| Time | 3.7s · 8.7s · 5.1s | 2.2s | 59s(*) | 28s(*) | 0.6s | |
See benchmark/README.md for the methodology and commands to reproduce these results
versions: evmole v0.4.1; whatsabi v0.14.1; sevm v0.6.19; 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