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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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12
src/rpcrawtransaction.cpp
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@@ -565,7 +565,7 @@ Value signrawtransaction(const Array& params, bool fHelp)
BOOST_FOREACH(const CTxIn& txin, mergedTx.vin) {
const uint256& prevHash = txin.prevout.hash;
CCoins coins;
view.GetCoins(prevHash, coins); // this is certainly allowed to fail
view.AccessCoins(prevHash); // this is certainly allowed to fail
}
view.SetBackend(viewDummy); // switch back to avoid locking mempool for too long
@@ -669,12 +669,12 @@ Value signrawtransaction(const Array& params, bool fHelp)
// Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
CTxIn& txin = mergedTx.vin[i];
CCoins coins;
if (!view.GetCoins(txin.prevout.hash, coins) || !coins.IsAvailable(txin.prevout.n)) {
const CCoins* coins = view.AccessCoins(txin.prevout.hash);
if (coins == NULL || !coins->IsAvailable(txin.prevout.n)) {
fComplete = false;
continue;
}
const CScript& prevPubKey = coins.vout[txin.prevout.n].scriptPubKey;
const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
txin.scriptSig.clear();
// Only sign SIGHASH_SINGLE if there's a corresponding output:
@@ -732,9 +732,9 @@ Value sendrawtransaction(const Array& params, bool fHelp)
fOverrideFees = params[1].get_bool();
CCoinsViewCache &view = *pcoinsTip;
CCoins existingCoins;
const CCoins* existingCoins = view.AccessCoins(hashTx);
bool fHaveMempool = mempool.exists(hashTx);
bool fHaveChain = view.GetCoins(hashTx, existingCoins) && existingCoins.nHeight < 1000000000;
bool fHaveChain = existingCoins && existingCoins->nHeight < 1000000000;
if (!fHaveMempool && !fHaveChain) {
// push to local node and sync with wallets
CValidationState state;