EOF Implementers Call #69 | March 19, 2025

Protocol Calls & happenings
1

EOF Implementers Call #69

Agenda

  • Testing Update
  • Client and Compiler Update
  • EOF-devnet-1 changes
  • EOF-devnet-2 changes

Other comments and resources

GitHub Issue

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Please add to agenda for Devnet-1

3

Agenda —

  • Testing

    • EOF Testing Roadmap.

  • Client Updates

  • EOF devnet 1

    • TXCREATE and initcode transaction
    • PAY opcode?
    • contract size update?

  • EOF devnet 2

    • Symbolic Introspection (EXTCODEADDRESS, EXTCODETYPE)
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Notes

Testing

  • Mario just got back from vacation
    • Not reviewing PRs in draft, take them out of draft if you want a review
  • question about blockchain engine tests - Will they give us any signal?
    • These are tests using hive instead of other APIs. Using the engine API. Same tests as state tests and blockchain tests. Different consumption route.
    • Clients may skip as right now it will give no extra signal. All tests are just EVM, unlike payload arguments and stuff like consolidations/withdrawals.
  • EOF Testing Roadmap
    • when do we want certain testing deadlines?
      • Mario:
        • need to finish the EOF tracker.
          • tracker is the list of tess from legacy tests.
        • need to review all ported tests
        • need code coverage metics in eels, possibly other clients
          • at least line coverage, maybe branch and path coverage too
      • ASAP? by when?
      • hive discussion
        • should be able to spin up hive as we have a live devnet. It’s all the same code paths.
      • Coverage discussion
        • Why EELS? Readable instead of optimized, makes missed cases more obvious when run against coverage tools
        • clients may be informative by EELS should provide most signal
        • evmone is at 100% line coverage from EEST
      • Pavel: Old tests repo has no relevant tests that are not already in EEST. Only fuzzer generated tess and out-of-date tests
      • Will provide reports in next call
      • Clients: please have code coverage reports for next week.

  • client updates

    • Nethermind: passing all current tests devnet-0
    • Besu: devnet-1 initial implementation, waiting on EEST for devnet-1
    • evmone: preparing devnet-1 changes. some but not all done.
    • EELS: no updates, not based on current head. Guru is the expert.
    • Erigon: reported passsing eest test devnet 0
    • Solidity:
      • prototype compiler was released
      • optimizer not turned on, will work on that later
    • No Reth, Geth, Vyper reports.

  • Devnet 1

    • TXCREATE and initcode
      • addresses many complaints about EOF
      • generally in a good place
    • evmone will help provide EEST tests
      • stack order done, data 0x04 → 0xff
    • PAY Opcode
      • Proposed to add to devnet 1
      • Fixes some issues noted in eth-magicians and twitter.
      • Just a trimmed down call opcode, implementation wise
      • Besu and nethermind support
      • was nice to have in legacy, needed in EOF because of gas introspection changes
      • Maybe move to glamsterdam?
      • There are other reentrancy solutions, but sometimes we want it.
      • Discussion about inclusion.
      • What are alternative re-entrency solutions? TSTORE/TLOAD, SSTORE/SLOAD (both expensive). checks-effects-interaction (gold standard)
      • Target devnet 2 - testing burden is the real cost.
    • Contract size update
      • two competing proposals - 7830 and 7907
      • Need ACD presentation on these two before consideration can be done.
        • variable costs may present security problems
        • In OZ codesize > 0 is a common test, so clients would need to cache sizes
        • EOF Code sections could help with statelessness
        • No broad support for either devnet or devnet 2