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kevacoin
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Combine CCoinsViewCache's HaveCoins and const GetCoins into AccessCoins. 

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.
0.10
Pieter Wuille 10 years ago
parent
b8d92236f6
commit
629d75faac
7 changed files with 54 additions and 51 deletions
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  1. 6
      src/bitcoin-tx.cpp
  2. 38
      src/coins.cpp
  3. 8
      src/coins.h
  4. 30
      src/main.cpp
  5. 7
      src/miner.cpp
  6. 12
      src/rpcrawtransaction.cpp
  7. 4
      src/txmempool.cpp

6
src/bitcoin-tx.cpp
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@ -418,12 +418,12 @@ static void MutateTxSign(CMutableTransaction& tx, const string& flagStr)
// Sign what we can: // Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++) { for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
CTxIn& txin = mergedTx.vin[i]; CTxIn& txin = mergedTx.vin[i];
CCoins coins; const CCoins* coins = view.AccessCoins(txin.prevout.hash);
if (!view.GetCoins(txin.prevout.hash, coins) || !coins.IsAvailable(txin.prevout.n)) { if (!coins || !coins->IsAvailable(txin.prevout.n)) {
fComplete = false; fComplete = false;
continue; continue;
} }
const CScript& prevPubKey = coins.vout[txin.prevout.n].scriptPubKey; const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
txin.scriptSig.clear(); txin.scriptSig.clear();
// Only sign SIGHASH_SINGLE if there's a corresponding output: // Only sign SIGHASH_SINGLE if there's a corresponding output:

38
src/coins.cpp
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@ -110,9 +110,13 @@ CCoins &CCoinsViewCache::GetCoins(const uint256 &txid) {
return it->second; return it->second;
} }
const CCoins &CCoinsViewCache::GetCoins(const uint256 &txid) const { const CCoins* CCoinsViewCache::AccessCoins(const uint256 &txid) const {
/* Avoid redundant implementation with the const-cast. */ CCoinsMap::const_iterator it = FetchCoins(txid);
return const_cast<CCoinsViewCache*>(this)->GetCoins(txid); if (it == cacheCoins.end()) {
return NULL;
} else {
return &it->second;
}
} }
bool CCoinsViewCache::SetCoins(const uint256 &txid, const CCoins &coins) { bool CCoinsViewCache::SetCoins(const uint256 &txid, const CCoins &coins) {
@ -162,9 +166,9 @@ unsigned int CCoinsViewCache::GetCacheSize() const {
const CTxOut &CCoinsViewCache::GetOutputFor(const CTxIn& input) const const CTxOut &CCoinsViewCache::GetOutputFor(const CTxIn& input) const
{ {
const CCoins &coins = GetCoins(input.prevout.hash); const CCoins* coins = AccessCoins(input.prevout.hash);
assert(coins.IsAvailable(input.prevout.n)); assert(coins && coins->IsAvailable(input.prevout.n));
return coins.vout[input.prevout.n]; return coins->vout[input.prevout.n];
} }
int64_t CCoinsViewCache::GetValueIn(const CTransaction& tx) const int64_t CCoinsViewCache::GetValueIn(const CTransaction& tx) const
@ -182,19 +186,12 @@ int64_t CCoinsViewCache::GetValueIn(const CTransaction& tx) const
bool CCoinsViewCache::HaveInputs(const CTransaction& tx) const bool CCoinsViewCache::HaveInputs(const CTransaction& tx) const
{ {
if (!tx.IsCoinBase()) { if (!tx.IsCoinBase()) {
// first check whether information about the prevout hash is available
for (unsigned int i = 0; i < tx.vin.size(); i++) { for (unsigned int i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout; const COutPoint &prevout = tx.vin[i].prevout;
if (!HaveCoins(prevout.hash)) const CCoins* coins = AccessCoins(prevout.hash);
return false; if (!coins || !coins->IsAvailable(prevout.n)) {
}
// then check whether the actual outputs are available
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout;
const CCoins &coins = GetCoins(prevout.hash);
if (!coins.IsAvailable(prevout.n))
return false; return false;
}
} }
} }
return true; return true;
@ -207,10 +204,11 @@ double CCoinsViewCache::GetPriority(const CTransaction &tx, int nHeight) const
double dResult = 0.0; double dResult = 0.0;
BOOST_FOREACH(const CTxIn& txin, tx.vin) BOOST_FOREACH(const CTxIn& txin, tx.vin)
{ {
const CCoins &coins = GetCoins(txin.prevout.hash); const CCoins* coins = AccessCoins(txin.prevout.hash);
if (!coins.IsAvailable(txin.prevout.n)) continue; assert(coins);
if (coins.nHeight < nHeight) { if (!coins->IsAvailable(txin.prevout.n)) continue;
dResult += coins.vout[txin.prevout.n].nValue * (nHeight-coins.nHeight); if (coins->nHeight < nHeight) {
dResult += coins->vout[txin.prevout.n].nValue * (nHeight-coins->nHeight);
} }
} }
return tx.ComputePriority(dResult); return tx.ComputePriority(dResult);

8
src/coins.h
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@ -344,11 +344,13 @@ public:
bool SetBestBlock(const uint256 &hashBlock); bool SetBestBlock(const uint256 &hashBlock);
bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock); bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
// Return a pointer to CCoins in the cache, or NULL if not found. This is
// more efficient than GetCoins. Modifications to other cache entries are
// allowed while accessing the returned pointer.
const CCoins* AccessCoins(const uint256 &txid) const;
// Return a modifiable reference to a CCoins. Check HaveCoins first. // Return a modifiable reference to a CCoins. Check HaveCoins first.
// Many methods explicitly require a CCoinsViewCache because of this method, to reduce
// copying.
CCoins &GetCoins(const uint256 &txid); CCoins &GetCoins(const uint256 &txid);
const CCoins &GetCoins(const uint256 &txid) const;
// Push the modifications applied to this cache to its base. // Push the modifications applied to this cache to its base.
// Failure to call this method before destruction will cause the changes to be forgotten. // Failure to call this method before destruction will cause the changes to be forgotten.

30
src/main.cpp
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@ -1017,9 +1017,9 @@ bool GetTransaction(const uint256 &hash, CTransaction &txOut, uint256 &hashBlock
int nHeight = -1; int nHeight = -1;
{ {
CCoinsViewCache &view = *pcoinsTip; CCoinsViewCache &view = *pcoinsTip;
CCoins coins; const CCoins* coins = view.AccessCoins(hash);
if (view.GetCoins(hash, coins)) if (coins)
nHeight = coins.nHeight; nHeight = coins->nHeight;
} }
if (nHeight > 0) if (nHeight > 0)
pindexSlow = chainActive[nHeight]; pindexSlow = chainActive[nHeight];
@ -1371,19 +1371,20 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
for (unsigned int i = 0; i < tx.vin.size(); i++) for (unsigned int i = 0; i < tx.vin.size(); i++)
{ {
const COutPoint &prevout = tx.vin[i].prevout; const COutPoint &prevout = tx.vin[i].prevout;
const CCoins &coins = inputs.GetCoins(prevout.hash); const CCoins *coins = inputs.AccessCoins(prevout.hash);
assert(coins);
// If prev is coinbase, check that it's matured // If prev is coinbase, check that it's matured
if (coins.IsCoinBase()) { if (coins->IsCoinBase()) {
if (nSpendHeight - coins.nHeight < COINBASE_MATURITY) if (nSpendHeight - coins->nHeight < COINBASE_MATURITY)
return state.Invalid( return state.Invalid(
error("CheckInputs() : tried to spend coinbase at depth %d", nSpendHeight - coins.nHeight), error("CheckInputs() : tried to spend coinbase at depth %d", nSpendHeight - coins->nHeight),
REJECT_INVALID, "bad-txns-premature-spend-of-coinbase"); REJECT_INVALID, "bad-txns-premature-spend-of-coinbase");
} }
// Check for negative or overflow input values // Check for negative or overflow input values
nValueIn += coins.vout[prevout.n].nValue; nValueIn += coins->vout[prevout.n].nValue;
if (!MoneyRange(coins.vout[prevout.n].nValue) || !MoneyRange(nValueIn)) if (!MoneyRange(coins->vout[prevout.n].nValue) || !MoneyRange(nValueIn))
return state.DoS(100, error("CheckInputs() : txin values out of range"), return state.DoS(100, error("CheckInputs() : txin values out of range"),
REJECT_INVALID, "bad-txns-inputvalues-outofrange"); REJECT_INVALID, "bad-txns-inputvalues-outofrange");
@ -1413,10 +1414,11 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
if (fScriptChecks) { if (fScriptChecks) {
for (unsigned int i = 0; i < tx.vin.size(); i++) { for (unsigned int i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout; const COutPoint &prevout = tx.vin[i].prevout;
const CCoins &coins = inputs.GetCoins(prevout.hash); const CCoins* coins = inputs.AccessCoins(prevout.hash);
assert(coins);
// Verify signature // Verify signature
CScriptCheck check(coins, tx, i, flags, 0); CScriptCheck check(*coins, tx, i, flags, 0);
if (pvChecks) { if (pvChecks) {
pvChecks->push_back(CScriptCheck()); pvChecks->push_back(CScriptCheck());
check.swap(pvChecks->back()); check.swap(pvChecks->back());
@ -1428,7 +1430,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
// arguments; if so, don't trigger DoS protection to // arguments; if so, don't trigger DoS protection to
// avoid splitting the network between upgraded and // avoid splitting the network between upgraded and
// non-upgraded nodes. // non-upgraded nodes.
CScriptCheck check(coins, tx, i, CScriptCheck check(*coins, tx, i,
flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, 0); flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, 0);
if (check()) if (check())
return state.Invalid(false, REJECT_NONSTANDARD, "non-mandatory-script-verify-flag"); return state.Invalid(false, REJECT_NONSTANDARD, "non-mandatory-script-verify-flag");
@ -1614,8 +1616,8 @@ bool ConnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, C
(pindex->nHeight==91880 && pindex->GetBlockHash() == uint256("0x00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721"))); (pindex->nHeight==91880 && pindex->GetBlockHash() == uint256("0x00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721")));
if (fEnforceBIP30) { if (fEnforceBIP30) {
BOOST_FOREACH(const CTransaction& tx, block.vtx) { BOOST_FOREACH(const CTransaction& tx, block.vtx) {
const uint256& hash = tx.GetHash(); const CCoins* coins = view.AccessCoins(tx.GetHash());
if (view.HaveCoins(hash) && !view.GetCoins(hash).IsPruned()) if (coins && !coins->IsPruned())
return state.DoS(100, error("ConnectBlock() : tried to overwrite transaction"), return state.DoS(100, error("ConnectBlock() : tried to overwrite transaction"),
REJECT_INVALID, "bad-txns-BIP30"); REJECT_INVALID, "bad-txns-BIP30");
} }

7
src/miner.cpp
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@ -167,12 +167,13 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
nTotalIn += mempool.mapTx[txin.prevout.hash].GetTx().vout[txin.prevout.n].nValue; nTotalIn += mempool.mapTx[txin.prevout.hash].GetTx().vout[txin.prevout.n].nValue;
continue; continue;
} }
const CCoins &coins = view.GetCoins(txin.prevout.hash); const CCoins* coins = view.AccessCoins(txin.prevout.hash);
assert(coins);
int64_t nValueIn = coins.vout[txin.prevout.n].nValue; int64_t nValueIn = coins->vout[txin.prevout.n].nValue;
nTotalIn += nValueIn; nTotalIn += nValueIn;
int nConf = pindexPrev->nHeight - coins.nHeight + 1; int nConf = pindexPrev->nHeight - coins->nHeight + 1;
dPriority += (double)nValueIn * nConf; dPriority += (double)nValueIn * nConf;
} }

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) { BOOST_FOREACH(const CTxIn& txin, mergedTx.vin) {
const uint256& prevHash = txin.prevout.hash; const uint256& prevHash = txin.prevout.hash;
CCoins coins; 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 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: // Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++) { for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
CTxIn& txin = mergedTx.vin[i]; CTxIn& txin = mergedTx.vin[i];
CCoins coins; const CCoins* coins = view.AccessCoins(txin.prevout.hash);
if (!view.GetCoins(txin.prevout.hash, coins) || !coins.IsAvailable(txin.prevout.n)) { if (coins == NULL || !coins->IsAvailable(txin.prevout.n)) {
fComplete = false; fComplete = false;
continue; continue;
} }
const CScript& prevPubKey = coins.vout[txin.prevout.n].scriptPubKey; const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
txin.scriptSig.clear(); txin.scriptSig.clear();
// Only sign SIGHASH_SINGLE if there's a corresponding output: // 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(); fOverrideFees = params[1].get_bool();
CCoinsViewCache &view = *pcoinsTip; CCoinsViewCache &view = *pcoinsTip;
CCoins existingCoins; const CCoins* existingCoins = view.AccessCoins(hashTx);
bool fHaveMempool = mempool.exists(hashTx); bool fHaveMempool = mempool.exists(hashTx);
bool fHaveChain = view.GetCoins(hashTx, existingCoins) && existingCoins.nHeight < 1000000000; bool fHaveChain = existingCoins && existingCoins->nHeight < 1000000000;
if (!fHaveMempool && !fHaveChain) { if (!fHaveMempool && !fHaveChain) {
// push to local node and sync with wallets // push to local node and sync with wallets
CValidationState state; CValidationState state;

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(); const CTransaction& tx2 = it2->second.GetTx();
assert(tx2.vout.size() > txin.prevout.n && !tx2.vout[txin.prevout.n].IsNull()); assert(tx2.vout.size() > txin.prevout.n && !tx2.vout[txin.prevout.n].IsNull());
} else { } else {
const CCoins &coins = pcoins->GetCoins(txin.prevout.hash); const CCoins* coins = pcoins->AccessCoins(txin.prevout.hash);
assert(coins.IsAvailable(txin.prevout.n)); assert(coins && coins->IsAvailable(txin.prevout.n));
} }
// Check whether its inputs are marked in mapNextTx. // Check whether its inputs are marked in mapNextTx.
std::map<COutPoint, CInPoint>::const_iterator it3 = mapNextTx.find(txin.prevout); std::map<COutPoint, CInPoint>::const_iterator it3 = mapNextTx.find(txin.prevout);

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