feat: Rex4 per-frame state growth limits#169
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…structure Migrate all four resource limit trackers to use the generic FrameLimitTracker<I> infrastructure. Per-frame budget enforcement (98/100 forwarding) is enabled for state growth only in Rex4; compute gas, data size, and KV updates remain TX-level-only. - Add FrameLimitTracker<I> and FrameLimitEntry<I> generic frame-aware tracking - Reimplement ComputeGasLimit2, DataSizeLimit2, KVUpdateLimit2, StateGrowthLimit2 on top of FrameLimitTracker, replacing old tracker types - Add frame-local exceed absorption in AdditionalLimit::before_frame_return_result - Add Rex4 spec, update RESOURCE_ACCOUNTING.md, and add tests
…itionalLimit to limit.rs
- Rename DataSizeLimit2, KVUpdateLimit2, ComputeGasLimit2, StateGrowthLimit2 to DataSizeTracker, KVUpdateTracker, ComputeGasTracker, StateGrowthTracker - Extract shared DataSizeFrameInfo from data_size.rs into frame_limit.rs as CallFrameInfo for use by both DataSizeTracker and KVUpdateTracker - Fix truncated doc comment on FrameLimitTracker::pop_frame - Fix arithmetic error in specs/Rex4.md example
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Summary
remaining * 98/100of the parent's remaining state growth budgetMegaLimitExceeded(uint8 kind, uint64 limit)revert data, allowing the parent to continueAdditionalLimitby extractingLimitCheckand introducingFrameLimitTrackerto manage per-frame budget allocation, enforcement, and merge-on-returnTest plan
cargo test -p mega-evm— all existing and new tests passcargo fmt --all --check— formatting verifiedtests/rex4/frame_state_growth.rswith 30+ tests covering:MegaLimitExceededABI decoding)