### Ipsilon Pawel Bylica -- [github.com/chfast](https://github.com/chfast) -- A protocol research team focusing on the EVM. Website: [ipsilon.xyz](https://ipsilon.xyz) --- ## EIP-3860: <br>Limit and meter initcode - Status: Review - Considered for inclusion in <br>_Shanghai_ Network Upgrade --- ### Abstract - _initcode_ max length limited to `49152` bytes - _initcode_ costs `2` gas per 32-byte chunk --- ### _Code_ vs _Initcode_ - Code: EVM bytecode of a deployed contract (what is stored in Ethereum State) - Initcode: ephemeral EVM bytecode used as a contract _constructor_ --- ### Let's bound initcode length - Code length is already bound to `24576` bytes (EIP-170) - Initcode can be of any length - EIP-3860 bounds it to **2x** the code length limit --- ### Let's pay for JUMPDEST analysis - JUMPDEST analysis must be performed on any EVM bytecode before execution - JUMPDEST analysis cost is proportional to the code length - Initcode is ephemeral - EIP-3860 adds cost of `2` gas per 32-byte chunk of _initcode_ --- ### Why not pay <br>for contract code length? - Already cost `200` to deploy each byte - JUMPDEST analysis may be cached alongside the code --- ### Why this cost? - 2 gas per 32-byte chunk - Conservative to limit impact - Best performing analysis: Geth - Compared with `KECCAK256` performance --- ### What is JUMPDEST analysis?  --- ### Valid usage above limit - Transaction [0x48342552bfde19b6d0ccb79850943ee891181af65efb47662ebd8f46a428fa3a](https://etherscan.io/tx/0x48342552bfde19b6d0ccb79850943ee891181af65efb47662ebd8f46a428fa3a) - creates 11 contracts in single go - `25.38M` gas used - transaction with `116262` bytes of initcode - 237% of the EIP-3860 limit --- ## Thanks!