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Merge bitcoin/bitcoin#34164: validation: add reusable coins view for ConnectBlock

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3e0fd0e4dd refactor: rename will_reuse_cache to reallocate_cache (Andrew Toth)
44b4ee194d validation: reuse same CCoinsViewCache for every ConnectBlock call (Andrew Toth)
8fb6043231 coins: introduce CCoinsViewCache::ResetGuard (Andrew Toth)
041758f5ed coins: use hashBlock setter internally for CCoinsViewCache methods (Andrew Toth)
8dd9200fc9 coins: add Reset on CCoinsViewCache (Andrew Toth)

Pull request description:

  This is the first commit of #31132, which can be merged as an independent change. It has a small benefit on its own, but will help in moving the parent PR forward.

  Add a `Reset()` method to `CCoinsViewCache` that clears `cacheCoins`, `cachedCoinsUsage`, and `hashBlock` without flushing to the `base` view. This allows efficiently reusing a cache instance across multiple blocks.

  Add `CCoinsViewCache::CreateResetGuard` method to return a `CCoinsViewCache::ResetGuard`. The `ResetGuard` automatically calls `Reset()` on destruction. This RAII pattern ensures the cache is always properly reset between blocks.

  Add `m_connect_block_view` as a persistent `CCoinsViewCache` for `ConnectBlock`, avoiding repeated memory allocations.

ACKs for top commit:
  l0rinc:
    ACK 3e0fd0e4dd
  achow101:
    ACK 3e0fd0e4dd
  sedited:
    ACK 3e0fd0e4dd

Tree-SHA512: a95feaa062a9eb7cf7514425a7e7adffd347cd1f7b32b4c1fefcde30002141757c184174702b3104a029dcd33194f8bd734159deebb2e668716089305b42cb00
This commit is contained in:
Ava Chow
2026-01-29 14:59:36 -08:00
parent 4e4fa0199e 3e0fd0e4dd
commit 6750744eb3
7 changed files with 116 additions and 11 deletions
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10
src/test/fuzz/coinscache_sim.cpp
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@@ -388,7 +388,7 @@ FUZZ_TARGET(coinscache_sim)
// Apply to simulation data.
flush();
// Apply to real caches.
caches.back()->Flush(/*will_reuse_cache=*/provider.ConsumeBool());
caches.back()->Flush(/*reallocate_cache=*/provider.ConsumeBool());
},
[&]() { // Sync.
@@ -398,6 +398,14 @@ FUZZ_TARGET(coinscache_sim)
caches.back()->Sync();
},
[&]() { // Reset.
sim_caches[caches.size()].Wipe();
// Apply to real caches.
{
const auto reset_guard{caches.back()->CreateResetGuard()};
}
},
[&]() { // GetCacheSize
(void)caches.back()->GetCacheSize();
},