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Switch from per-tx to per-txout CCoinsViewCache methods in some places

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This commit is contained in:
Pieter Wuille
2017-04-25 11:29:30 -07:00
parent 0003911326
commit f68cdfe92b
8 changed files with 83 additions and 93 deletions
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87
src/validation.cpp
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@@ -498,8 +498,8 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
// during reorgs to ensure COINBASE_MATURITY is still met.
bool fSpendsCoinbase = false;
BOOST_FOREACH(const CTxIn &txin, tx.vin) {
const CCoins *coins = view.AccessCoins(txin.prevout.hash);
if (coins->IsCoinBase()) {
const Coin &coin = view.AccessCoin(txin.prevout);
if (coin.IsCoinBase()) {
fSpendsCoinbase = true;
break;
}
@@ -818,15 +818,8 @@ bool GetTransaction(const uint256 &hash, CTransactionRef &txOut, const Consensus
}
if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it
int nHeight = -1;
{
const CCoinsViewCache& view = *pcoinsTip;
const CCoins* coins = view.AccessCoins(hash);
if (coins)
nHeight = coins->nHeight;
}
if (nHeight > 0)
pindexSlow = chainActive[nHeight];
const Coin& coin = AccessByTxid(*pcoinsTip, hash);
if (!coin.IsPruned()) pindexSlow = chainActive[coin.nHeight];
}
if (pindexSlow) {
@@ -1074,19 +1067,12 @@ void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, CTxUndo &txund
if (!tx.IsCoinBase()) {
txundo.vprevout.reserve(tx.vin.size());
BOOST_FOREACH(const CTxIn &txin, tx.vin) {
CCoinsModifier coins = inputs.ModifyCoins(txin.prevout.hash);
unsigned nPos = txin.prevout.n;
if (nPos >= coins->vout.size() || coins->vout[nPos].IsNull())
assert(false);
// mark an outpoint spent, and construct undo information
txundo.vprevout.emplace_back(coins->vout[nPos], coins->nHeight, coins->fCoinBase);
bool ret = coins->Spend(nPos);
assert(ret);
txundo.vprevout.emplace_back();
inputs.SpendCoin(txin.prevout, &txundo.vprevout.back());
}
}
// add outputs
inputs.ModifyNewCoins(tx.GetHash(), tx.IsCoinBase())->FromTx(tx, nHeight);
AddCoins(inputs, tx, nHeight);
}
void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, int nHeight)
@@ -1260,24 +1246,21 @@ int ApplyTxInUndo(Coin&& undo, CCoinsViewCache& view, const COutPoint& out)
{
bool fClean = true;
CCoinsModifier coins = view.ModifyCoins(out.hash);
if (undo.nHeight != 0) {
if (!coins->IsPruned()) {
if (coins->fCoinBase != undo.fCoinBase || (uint32_t)coins->nHeight != undo.nHeight) fClean = false; // metadata mismatch
if (view.HaveCoins(out)) fClean = false; // overwriting transaction output
if (undo.nHeight == 0) {
// Missing undo metadata (height and coinbase). Older versions included this
// information only in undo records for the last spend of a transactions'
// outputs. This implies that it must be present for some other output of the same tx.
const Coin& alternate = AccessByTxid(view, out.hash);
if (!alternate.IsPruned()) {
undo.nHeight = alternate.nHeight;
undo.fCoinBase = alternate.fCoinBase;
} else {
return DISCONNECT_FAILED; // adding output for transaction without known metadata
}
// restore height/coinbase tx metadata from undo data
coins->fCoinBase = undo.fCoinBase;
coins->nHeight = undo.nHeight;
} else {
// Undo data does not contain height/coinbase. This should never happen
// for newly created undo entries. Previously, this data was only saved
// for the last spend of a transaction's outputs, so check IsPruned().
if (coins->IsPruned()) fClean = false; // adding output to missing transaction
}
if (coins->IsAvailable(out.n)) fClean = false; // overwriting existing output
if (coins->vout.size() < out.n+1)
coins->vout.resize(out.n+1);
coins->vout[out.n] = std::move(undo.out);
view.AddCoin(out, std::move(undo), undo.fCoinBase);
return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
}
@@ -1313,15 +1296,15 @@ static DisconnectResult DisconnectBlock(const CBlock& block, const CBlockIndex*
// Check that all outputs are available and match the outputs in the block itself
// exactly.
{
CCoinsModifier outs = view.ModifyCoins(hash);
outs->ClearUnspendable();
CCoins outsBlock(tx, pindex->nHeight);
if (*outs != outsBlock) fClean = false; // transaction mismatch
// remove outputs
outs->Clear();
for (size_t o = 0; o < tx.vout.size(); o++) {
if (!tx.vout[o].scriptPubKey.IsUnspendable()) {
COutPoint out(hash, o);
Coin coin;
view.SpendCoin(out, &coin);
if (tx.vout[o] != coin.out) {
fClean = false; // transaction output mismatch
}
}
}
// restore inputs
@@ -1518,10 +1501,12 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
if (fEnforceBIP30) {
for (const auto& tx : block.vtx) {
const CCoins* coins = view.AccessCoins(tx->GetHash());
if (coins && !coins->IsPruned())
return state.DoS(100, error("ConnectBlock(): tried to overwrite transaction"),
REJECT_INVALID, "bad-txns-BIP30");
for (size_t o = 0; o < tx->vout.size(); o++) {
if (view.HaveCoins(COutPoint(tx->GetHash(), o))) {
return state.DoS(100, error("ConnectBlock(): tried to overwrite transaction"),
REJECT_INVALID, "bad-txns-BIP30");
}
}
}
}
@@ -1588,7 +1573,7 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
// be in ConnectBlock because they require the UTXO set
prevheights.resize(tx.vin.size());
for (size_t j = 0; j < tx.vin.size(); j++) {
prevheights[j] = view.AccessCoins(tx.vin[j].prevout.hash)->nHeight;
prevheights[j] = view.AccessCoin(tx.vin[j].prevout).nHeight;
}
if (!SequenceLocks(tx, nLockTimeFlags, &prevheights, *pindex)) {