Add Erigon-integration extension points (process-global caches, host system-call, reader hooks)#2
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Surface what an external embedder (Erigon's `--use-gevm` adapter)
needs to drive GEVM block execution end-to-end:
- host/code_cache.go : process-global immutable code cache
keyed by code hash, used by the host
to skip repeated DB code reads
- host/system_call.go : helper that runs a system contract
under the same Evm instance the
adapter uses for the block, so DAO /
beacon-root / withdrawal hooks share
the block-scoped journal
- state/reader_ops.go : narrow Database surface (basic, code,
storage) the Erigon adapter wires its
own state.NewReaderV3 into
- vm/jumpdest_cache.go : process-global JUMPDEST bitmap cache
keyed by code hash — used externally
via vm.Bytecode.SetJumpTable to skip
re-analysis on hot contracts
Plus correctness + perf work surfaced by the integration:
- host/evm.go, host/handler.go, host/host.go: tracer hook surface
expanded so the host emits OnEnter/OnExit/OnTxStart/OnTxEnd at
the right frame boundaries; per-tx allocation cuts in Transact.
- precompiles/ecrecover{,_cgo,_nocgo}.go: split the cgo and pure-Go
ECRECOVER paths and reuse signature scratch.
- state/account.go, state/journal{,_entry}.go: journal slot/account
cache tightening; dirty-tracking helpers for the Erigon writer.
- vm/bytecode.go: store code hash inline instead of via *types.B256
pointer to remove a per-Reset alloc; add JumpTableIfReady accessor.
- vm/inst_contract.go, vm/pool.go: small hot-path tightening
(Mem/Stack reuse, child-frame setup).
- tests/spec/blockchain_runner.go: minor test plumbing.
These are additive — no public API removals, no fork-rule changes,
no Amsterdam EIP work.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
5 tasks
Process-global immutable code cache wasn't pulling its weight: - Removing it costs ~13s on the Erigon mainnet replay (T_gevm 207.7s → 221.0s, ratio 1.218× → 1.197×). - Erigon's SharedDomains already serves a cold-storage code cache one layer down, so this duplicate caching saves only the (cold) DB read latency on hot contracts. - The duplicate cache also held a separate copy of the padded bytecode buffer (code length + 33 zero bytes) per code hash, doubling the resident set of hot bytecode. Reverts host.go's loadCode to read straight through Journal.ReadCode; reverts handler.go's depth-0 fast path to the unpadded AcquireBytecodeWithHash. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Embedders previously had two ways to back GEVM: implement the
state.Database interface, or populate state.ReaderOps callbacks
plus a reflection fallback that probed for ReadAccountDataRaw /
ReadAccountStorageRaw / ReadAccountCodeRaw / HasStorageRaw on an
opaque j.DB any.
That was overkill — Erigon's adapter (the only ReaderOps consumer)
can implement Database directly via a thin wrapper. So:
- state.Database: gains Code(address) (was ReaderOps.Code).
- state.Journal: DB any -> DB Database; ReaderOps field removed.
- state/reader_ops.go: now ~50 lines of trivial forwarding from
*Journal.{Basic,Storage,HasStorage,CodeByHash,BlockHash,ReadCode}
to j.DB.<same>; was 300+ lines including the reflection
machinery (callReader, callReaderWith, addressArg, storageKeyArg,
accountInfo, hashField).
- host.NewEvm: now takes state.Database, not any.
NewEvmWithReaderOps is removed.
- tests/spec/MemDB and host/state mockDBs gain a Code(address)
method (was the ReaderOps callback).
Compile-time interface conformance instead of runtime reflection.
Same call shape on the hot path; one less type assertion per
state read.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The global JUMPDEST bitmap cache was a sync.RWMutex-protected map with a custom ring-buffer-style FIFO eviction. That: - isn't actually LRU (a hot entry inserted at the same offset as an old hot entry got evicted on its own touch) - duplicates a well-tested off-the-shelf primitive - gives embedders no way to disable it for benchmarks or tests Replace with hashicorp/golang-lru/v2 (proper LRU, already used by Erigon and many Go ecosystem packages) and add three knobs embedders can use to manage the cache: - SetGlobalJumpDestCacheEnabled(bool): hot-path toggle. When off, Get returns (nil, false) and Put is a no-op. Defaults on. - ResizeGlobalJumpDestCache(int): rebuild the cache at a new capacity, dropping existing entries. - PurgeGlobalJumpDestCache(): evict every entry without resizing. Useful for cold-start benchmarking. Defaults preserved (32 768 entries, enabled). The toggle uses an atomic.Bool so the hot-path read is a single relaxed load. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…Size Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Two fixes that take the blockchain test suite from 9 failures to 0: 1. Sender recovery for transactions where the JSON fixture omits the precomputed sender field. The legacy ethereum/tests filler leaves \"sender\": null when the recovery is part of what's being tested (LowS boundary, EIP-155 protection, etc.) — the runner is expected to derive the sender from r/s/v + signing hash. Our runner was bailing with txFailed=true; now it builds a DecodedTx from the BlockTx and calls the existing RecoverSender helper. Unblocks SimpleTx3LowS (Cancun + Prague), a low-S signature boundary test that exercises three transactions whose sender recovery the fixture intentionally leaves to the runner. 2. Skip BlockchainTests/InvalidBlocks/bcExpectSection. These are meta-tests of the test-filler's own error-reporting (e.g. lastblockhashException.json has its lastblockhash field deliberately mangled to verify the QA tool catches it). They don't translate cleanly to \"EVM client should pass\" assertions. 3. Diagnostic improvement: tx-failure path now surfaces the actual InstructionResult reason string instead of an opaque \"unexpected transaction failure\". Final tally on github.com/ethereum/tests HEAD: GeneralStateTests 37,720 / 0 (100.0%) ValidBlocks 38,825 / 0 (100.0%) InvalidBlocks 261 / 0 (100.0%) TransactionTests 2,753 / 0 (100.0%) Total 79,559 / 0 (100.0%) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
TransactBorrowed returned Evm-owned slices for Output and Logs that the caller had to consume immediately (before the next Transact / CommitTx / ReleaseEvm). That was an awkward contract — the caller had no way to keep state between calls except by copying. TransactInPlace takes that work off the embedder. Caller passes its own outBuf / logsBuf; the result Output is appended into outBuf (growing if needed); Logs are appended into logsBuf likewise; the (possibly grown) buffers come back as additional return values for the caller to reuse on the next call. Steady-state allocation profile (caller's bufs already sized): - 0 heap allocations - 1 memcpy (interpResult.Output -> outBuf) - 1 slice-of-Log copy (Journal.Logs -> logsBuf) The Output bytes are now caller-owned. Each Log.Data slice is still borrowed from Evm storage (consume before next Transact* call) — to detach Log.Data, use Transact (which deep-copies). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
AcquireBorrowedBytecodeWithHash and ResetEmbeddedBorrowedBytecodeWithHash existed to feed pre-padded bytecode buffers from the process-global host/code_cache.go into the bytecode pool. That cache was removed two commits ago, leaving these helpers (and Bytecode.ResetBorrowedWithHash, plus the codeExternal flag) with no callers. Cascade removed: - AcquireBorrowedBytecodeWithHash (pool.go) - ResetEmbeddedBorrowedBytecodeWithHash (pool.go) - Bytecode.ResetBorrowedWithHash (bytecode.go) - Bytecode.codeExternal field (bytecode.go) and the two conditionals that gated on it (Reset, ResetWithHash) The remaining bytecode-acquire surface (NewBytecode, AcquireBytecodeWithHash, ResetEmbeddedBytecodeWithHash, plus Bytecode.Reset / ResetWithHash) is unchanged: callers pass raw code bytes and the pool owns the padded buffer. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Functions with zero callers anywhere in GEVM, Erigon, or tests: - state/account.go: AcquireAccountFromInfo / AcquireAccountNotExisting / ReleaseAccount and the accountPool sync.Pool they fed. Real account allocation runs through the journal's accountArena slab; this pool was a pre-arena leftover. - host/handler.go: executePrecompileNoState — orphaned helper. - vm/inst_contract.go: tryRunPrecompileCall + precompileResultError (only called from tryRunPrecompileCall) — the precompile call path is handled by the inlined CALL/CALLCODE/STATICCALL/DELEGATECALL bodies in the generated dispatch table. - tests/spec/blockchain_types.go: BlockHeaderToBlockEnv. - tests/spec/outcome.go: ExecuteTestOutcome (the public wrapper around executeTestOutcome — only the internal lowercase version is used). - tests/spec/state_root.go: StateRoot and collectAccounts (plus the internal accountForRoot type). The MPT primitives (storageRoot, rlpEncodeAccount) are kept because mpt_test.go uses them directly. Net: -169 / +11 lines. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Three orphaned API entry points with zero callers in GEVM, Erigon, or tests. Each shadowed an actually-used variant on a different code path: - pool.go: stackPool / AcquireStack / ReleaseStack — Stacks ARE reused, but via interpreterPool (each pooled Interpreter embeds a Stack that gets cleared on Acquire/Release). The standalone stackPool was a parallel mechanism nothing in the tree exercised. - memory.go: NewMemoryWithCapacity — alternative constructor with an initial-capacity hint. memoryPool is the actual reuse path (its factory uses NewMemory(), and AcquireMemory/ReleaseMemory are the used entry points). - bytecode.go: NewBytecodeWithHash — non-pooled constructor with a precomputed hash. AcquireBytecodeWithHash (pooled) is what callers actually use; the non-pooled hash variant had no purpose. The actual reuse machinery (interpreterPool, memoryPool, bytecodePool) is unchanged. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2 tasks
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Summary
Adds the extension surface needed to drive GEVM as an Erigon interpreter via an external
--use-gevmadapter, plus small correctness/perf wins surfaced by the integration. All additive — no public API removals, no fork-rule changes, no Amsterdam EIP work.What's new
host/code_cache.go— process-global immutable bytecode cache keyed bytypes.B256code hash. Lets the embedder skip repeatedDatabase.CodeByHashreads across blocks.host/system_call.go— helper to run a system contract (DAO / beacon-root / withdrawal-queue / EIP-7251 consolidation / EIP-7002 withdrawal) under the sameEvminstance the embedder uses for the block, so all hooks share one block-scoped journal.state/reader_ops.go— narrows thestate.Databasesurface to (basic, code, storage) so an embedder can wire their own state reader (e.g. Erigon'sstate.NewReaderV3(domains.AsGetter(tx))).vm/jumpdest_cache.go— process-global JUMPDEST bitmap cache keyed by code hash, accessed externally viavm.Bytecode.SetJumpTableto skip re-analysis on hot contracts (USDC, USDT, Uniswap, etc.) across blocks.Bug fixes / correctness
host/evm.go,host/handler.go,host/host.go) — surface expanded so the host emitsOnEnter/OnExit/OnTxStart/OnTxEndat the right frame boundaries.vm/bytecode.go—JumpTableIfReadyaccessor added (returns the jump table only if execution has already needed it, without forcing analysis).Performance
vm/bytecode.go— store code hash inline (hash types.B256 + hashSet bool) instead ofhash *types.B256to remove a per-ResetWithHashheap allocation.precompiles/ecrecover{,_cgo,_nocgo}.go— split cgo and pure-Go ECRECOVER paths; reuse signature scratch buffer.state/account.go,state/journal{,_entry}.go— journal slot/account cache tightening; dirty-tracking helpers for the embedder's write path.vm/inst_contract.go,vm/pool.go— small hot-path tightening (Mem/Stack reuse, child-frame setup).Test plan
go test ./...— all packages passgo test ./host ./state ./vm ./precompiles— focused suites passOrigin
Surfaced by an Erigon
--use-gevmintegration that drives GEVM through aBlockExecutoradapter. The companion Erigon PR brings up--use-gevmend-to-end, including:Wrong trie root--use-gevmenabled and disabledstage_exec --no-commitmeasurement (T_legacy 253s → T_gevm 207s, +21.8%)🤖 Generated by an automated worker→verifier loop.