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Use ModifyCoins instead of mutable GetCoins.

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Replace the mutable non-copying GetCoins method with a ModifyCoins, which
returns an encapsulated iterator, so we can keep track of concurrent
modifications (as iterators can be invalidated by those) and run cleanup
code after a modification is finished.

This also removes the overloading of the 'GetCoins' name.
This commit is contained in:
Pieter Wuille
2014-09-03 09:01:24 +02:00
parent 7a04f3d708
commit f28aec014e
5 changed files with 108 additions and 62 deletions
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49
src/main.cpp
View File

@@ -1348,22 +1348,18 @@ void static InvalidBlockFound(CBlockIndex *pindex, const CValidationState &state
void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, CTxUndo &txundo, int nHeight)
{
bool ret;
// mark inputs spent
if (!tx.IsCoinBase()) {
txundo.vprevout.reserve(tx.vin.size());
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const CTxIn &txin = tx.vin[i];
CCoins &coins = inputs.GetCoins(txin.prevout.hash);
BOOST_FOREACH(const CTxIn &txin, tx.vin) {
txundo.vprevout.push_back(CTxInUndo());
ret = coins.Spend(txin.prevout, txundo.vprevout.back());
bool ret = inputs.ModifyCoins(txin.prevout.hash)->Spend(txin.prevout, txundo.vprevout.back());
assert(ret);
}
}
// add outputs
ret = inputs.SetCoins(tx.GetHash(), CCoins(tx, nHeight));
assert(ret);
inputs.ModifyCoins(tx.GetHash())->FromTx(tx, nHeight);
}
bool CScriptCheck::operator()() const {
@@ -1504,21 +1500,23 @@ bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex
// exactly. Note that transactions with only provably unspendable outputs won't
// have outputs available even in the block itself, so we handle that case
// specially with outsEmpty.
{
CCoins outsEmpty;
CCoins &outs = view.HaveCoins(hash) ? view.GetCoins(hash) : outsEmpty;
outs.ClearUnspendable();
CCoinsModifier outs = view.ModifyCoins(hash);
outs->ClearUnspendable();
CCoins outsBlock = CCoins(tx, pindex->nHeight);
CCoins outsBlock(tx, pindex->nHeight);
// The CCoins serialization does not serialize negative numbers.
// No network rules currently depend on the version here, so an inconsistency is harmless
// but it must be corrected before txout nversion ever influences a network rule.
if (outsBlock.nVersion < 0)
outs.nVersion = outsBlock.nVersion;
if (outs != outsBlock)
outs->nVersion = outsBlock.nVersion;
if (*outs != outsBlock)
fClean = fClean && error("DisconnectBlock() : added transaction mismatch? database corrupted");
// remove outputs
outs = CCoins();
outs->Clear();
}
// restore inputs
if (i > 0) { // not coinbases
@@ -1528,27 +1526,24 @@ bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex
for (unsigned int j = tx.vin.size(); j-- > 0;) {
const COutPoint &out = tx.vin[j].prevout;
const CTxInUndo &undo = txundo.vprevout[j];
CCoins coins;
view.GetCoins(out.hash, coins); // this can fail if the prevout was already entirely spent
CCoinsModifier coins = view.ModifyCoins(out.hash);
if (undo.nHeight != 0) {
// undo data contains height: this is the last output of the prevout tx being spent
if (!coins.IsPruned())
if (!coins->IsPruned())
fClean = fClean && error("DisconnectBlock() : undo data overwriting existing transaction");
coins = CCoins();
coins.fCoinBase = undo.fCoinBase;
coins.nHeight = undo.nHeight;
coins.nVersion = undo.nVersion;
coins->Clear();
coins->fCoinBase = undo.fCoinBase;
coins->nHeight = undo.nHeight;
coins->nVersion = undo.nVersion;
} else {
if (coins.IsPruned())
if (coins->IsPruned())
fClean = fClean && error("DisconnectBlock() : undo data adding output to missing transaction");
}
if (coins.IsAvailable(out.n))
if (coins->IsAvailable(out.n))
fClean = fClean && error("DisconnectBlock() : undo data overwriting existing output");
if (coins.vout.size() < out.n+1)
coins.vout.resize(out.n+1);
coins.vout[out.n] = undo.txout;
if (!view.SetCoins(out.hash, coins))
return error("DisconnectBlock() : cannot restore coin inputs");
if (coins->vout.size() < out.n+1)
coins->vout.resize(out.n+1);
coins->vout[out.n] = undo.txout;
}
}
}