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Combine CCoinsViewCache's HaveCoins and const GetCoins into AccessCoins.

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The efficient version of CCoinsViewCache::GetCoins only works for known-to-exist
cache entries, requiring a separate HaveCoins call beforehand. This is
inefficient as both perform a hashtable lookup.

Replace the non-mutable GetCoins with AccessCoins, which returns a potentially-NULL
pointer. This also decreases the overloading of GetCoins.

Also replace some copying (inefficient) GetCoins calls with equivalent AccessCoins,
decreasing the copying.
This commit is contained in:
Pieter Wuille 2014-09-02 21:21:15 +02:00
parent b8d92236f6
commit 629d75faac
7 changed files with 54 additions and 51 deletions
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4
src/txmempool.cpp
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@ -509,8 +509,8 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
const CTransaction& tx2 = it2->second.GetTx();
assert(tx2.vout.size() > txin.prevout.n && !tx2.vout[txin.prevout.n].IsNull());
} else {
const CCoins &coins = pcoins->GetCoins(txin.prevout.hash);
assert(coins.IsAvailable(txin.prevout.n));
const CCoins* coins = pcoins->AccessCoins(txin.prevout.hash);
assert(coins && coins->IsAvailable(txin.prevout.n));
}
// Check whether its inputs are marked in mapNextTx.
std::map<COutPoint, CInPoint>::const_iterator it3 = mapNextTx.find(txin.prevout);