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EvmSnapshot

evm_fork_cache::cache::snapshot

Struct EvmSnapshot 

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pub struct EvmSnapshot { /* private fields */ }
Expand description

Immutable EVM state snapshot — Send + Sync, shared via Arc across threads.

A two-tier copy-on-write view (see the module docs): an Arc-shared, memoized cold base (layer 2) plus a small per-snapshot overlay folding the hot layer-1 CacheDB delta, which shadows the base on reads. Lookups (including the public storage_value) are O(1) and lock-free, and reproduce the live cache’s layered semantics bit-for-bit.

Created via super::EvmCache::snapshot(). Each parallel simulation task gets its own super::EvmOverlay backed by a cheap Arc::clone of the snapshot.

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impl EvmSnapshot

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pub fn storage_value(&self, address: Address, slot: U256) -> Option<U256>

Return the snapshot’s value for a storage slot, mirroring the live read.

Used by the freshness validator to compare a freshly-fetched value against the value the snapshot was built from. Resolution matches EvmCache::cached_storage_value over the two tiers: an overlay (layer-1) slot wins; for a cleared account an absent overlay slot returns Some(ZERO) (its storage is locally complete — the base is never consulted); otherwise the base (layer-2) slot is returned, or None if neither tier has seen the slot.

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