[codex] add evm-only giga executor path

[codchen]

Summary

• add giga/evmonly as the final-form EVM-only giga execution path boundary
• define raw Ethereum RLP block input and commit-neutral outputs as an EVM-native state changeset plus receipts
• port the core sei-v3-style execution shape directly into giga/evmonly:
  • raw RLP tx parsing and sender recovery
  • go-ethereum execution against an SDK-free native vm.StateDB
  • key-addressable EVM-native balance, nonce, code, and storage state reads
  • deterministic post-block StateChangeSet output
  • Ethereum receipt and per-tx metadata construction
• add a map-backed MemoryState backend for tests and early integration
• leave custom precompiles as fail-closed placeholders behind an SDK-free registry/context
• refresh the README to describe the current implementation, input/output contract, and known limitations

Notes

Custom precompile behavior is intentionally still open. Registered custom precompile addresses return ErrCustomPrecompilesOpen, including through geth's precompile map, so calls fail closed instead of silently executing as empty accounts.

The current port is sequential. The state boundary and changeset shape are intended to be replaceable with the sei-v3 OCC scheduler/store once that layer is brought over.

Historical BLOCKHASH lookups beyond the parent block are not wired yet; BlockHash is currently used for receipt/log metadata.

Validation

go test ./giga/evmonly/...
go test ./giga/...

[codecov]

Codecov Report

❌ Patch coverage is 76.77225% with 154 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.21%. Comparing base (2b9261f) to head (9c28df7).

Files with missing lines	Patch %	Lines
giga/evmonly/state_db.go	70.35%	102 Missing and 16 partials ⚠️
giga/evmonly/executor.go	85.23%	15 Missing and 7 partials ⚠️
giga/evmonly/state.go	88.63%	5 Missing and 5 partials ⚠️
giga/evmonly/parser.go	80.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
- Coverage   59.01%   58.21%   -0.81%     
==========================================
  Files        2244     2175      -69     
  Lines      184523   176633    -7890     
==========================================
- Hits       108902   102830    -6072     
+ Misses      65920    64773    -1147     
+ Partials     9701     9030     -671     

Flag	Coverage Δ
sei-chain-pr	76.77% <76.77%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
giga/evmonly/config.go	100.00% <100.00%> (ø)
giga/evmonly/parser.go	80.00% <80.00%> (ø)
giga/evmonly/state.go	88.63% <88.63%> (ø)
giga/evmonly/executor.go	85.23% <85.23%> (ø)
giga/evmonly/state_db.go	70.35% <70.35%> (ø)

... and 74 files with indirect coverage changes

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 24, 2026, 4:43 AM

[cursor]

PR Summary

Medium Risk
New core EVM execution stack with block-abort semantics and state/receipt outputs; not wired into app yet, but correctness and integration will be high impact later.

Overview
Introduces giga/evmonly, a Cosmos-free execution boundary for the final-form giga path: ordered blocks of raw Ethereum RLP txs in, commit-neutral StateChangeSet plus Ethereum receipts out.

The Executor runs core.ApplyMessage via go-ethereum against an SDK-free nativeStateDB backed by key-addressable StateReader / StateWriter. It handles RLP decode and sender recovery, optional min gas price / nonce policy, per-tx Finalise, and aborts the whole block on validation errors while still emitting failed receipts for in-tx EVM failures. MemoryState supports tests; registered custom precompiles are wired only as fail-closed stubs returning ErrCustomPrecompilesOpen. A README documents the I/O contract and known gaps (sequential execution, parent-only BLOCKHASH, precompile porting).

^{Reviewed by Cursor Bugbot for commit 9c28df7. Bugbot is set up for automated code reviews on this repo. Configure here.}

[philipsu522]

does "SDK" mean Cosmos?

[codchen]

yep

[philipsu522]

do we need to set acct.Created = false?

[codchen]

Created is used to decided whether SelfDestruct6780 should early return, and I think the behavior of SelfDestruct6780 is to not early return if selfdestruct is called multiple times, so I think we shouldn't set Created to false upon selfdestruct (consistent with geth)

[philipsu522]

is this dangerous? could someone maliciously set gasLimit = 0 to bypass any limits we may have?

[codchen]

gasLimit here is the block gas limit, so it'd be decided by consensus and not set by tx senders

[philipsu522]

this is a lot of critical state changing code. i think we need a lot of tests here. Could we use AI to generate a ton of unit cases, interleaving ordering of contract creation/deletion, invalid txs (out of gas, invalid state transition, invalid nonce, verify receipt outputs...etc).

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

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^{Reviewed by Cursor Bugbot for commit 23fc6d3. Configure here.}