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Exercise non-DIRTY spent coins in caches in fuzz test

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This commit is contained in:
Pieter Wuille 2023-02-03 10:33:31 -05:00
parent 59e6828bb5
commit 561848aaf2
1 changed files with 18 additions and 8 deletions
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28
src/test/fuzz/coinscache_sim.cpp
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@ -133,7 +133,13 @@ struct CacheLevel
}
};
/** Class for the base of the hierarchy (roughly simulating a memory-backed CCoinsViewDB). */
/** Class for the base of the hierarchy (roughly simulating a memory-backed CCoinsViewDB).
*
* The initial state consists of the empty UTXO set, though coins whose output index
* is 3 (mod 5) always have GetCoin() succeed (but returning an IsSpent() coin unless a UTXO
* exists). Coins whose output index is 4 (mod 5) have GetCoin() always succeed after being spent.
* This exercises code paths with spent, non-DIRTY cache entries.
*/
class CoinsViewBottom final : public CCoinsView
{
std::map<COutPoint, Coin> m_data;
@ -143,6 +149,10 @@ public:
{
auto it = m_data.find(outpoint);
if (it == m_data.end()) {
if ((outpoint.n % 5) == 3) {
coin.Clear();
return true;
}
return false;
} else {
coin = it->second;
@ -164,7 +174,7 @@ public:
{
for (auto it = data.begin(); it != data.end(); it = erase ? data.erase(it) : std::next(it)) {
if (it->second.flags & CCoinsCacheEntry::DIRTY) {
if (it->second.coin.IsSpent()) {
if (it->second.coin.IsSpent() && (it->first.n % 5) != 4) {
m_data.erase(it->first);
} else if (erase) {
m_data[it->first] = std::move(it->second.coin);
@ -173,10 +183,10 @@ public:
}
} else {
/* For non-dirty entries being written, compare them with what we have. */
if (it->second.coin.IsSpent()) {
assert(m_data.count(it->first) == 0);
} else {
auto it2 = m_data.find(it->first);
if (it->second.coin.IsSpent()) {
assert(it2 == m_data.end() || it2->second.IsSpent());
} else {
assert(it2 != m_data.end());
assert(it->second.coin.out == it2->second.out);
assert(it->second.coin.fCoinBase == it2->second.fCoinBase);
@ -262,9 +272,9 @@ FUZZ_TARGET(coinscache_sim)
auto real = caches.back()->GetCoin(data.outpoints[outpointidx], realcoin);
// Compare results.
if (!sim.has_value()) {
assert(!real);
assert(!real || realcoin.IsSpent());
} else {
assert(!realcoin.IsSpent());
assert(real && !realcoin.IsSpent());
const auto& simcoin = data.coins[sim->first];
assert(realcoin.out == simcoin.out);
assert(realcoin.fCoinBase == simcoin.fCoinBase);
@ -457,9 +467,9 @@ FUZZ_TARGET(coinscache_sim)
bool real = bottom.GetCoin(data.outpoints[outpointidx], realcoin);
auto sim = lookup(outpointidx, 0);
if (!sim.has_value()) {
assert(!real);
assert(!real || realcoin.IsSpent());
} else {
assert(!realcoin.IsSpent());
assert(real && !realcoin.IsSpent());
assert(realcoin.out == data.coins[sim->first].out);
assert(realcoin.fCoinBase == data.coins[sim->first].fCoinBase);
assert(realcoin.nHeight == sim->second);