Merge pull request #6872

dd5862c Flush coins cache also after transaction processing (Pieter Wuille)
bde953e Uncache input txn in utxo cache if a tx is not accepted to mempool (Matt Corallo)
97bf377 Add CCoinsViewCache::HaveCoinsInCache to check if a tx is cached (Matt Corallo)
677aa3d Discard txn cache entries that were loaded for removed mempool txn (Matt Corallo)
b2e74bd Get the set of now-uncacheable-txn from CTxMemPool::TrimToSize (Matt Corallo)
74d0f90 Add method to remove a tx from CCoinsViewCache if it is unchanged (Matt Corallo)

1 files changed, 20 insertions, 2 deletions

diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 35be216287..fea5da8029 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -944,7 +944,7 @@ void CTxMemPool::trackPackageRemoved(const CFeeRate& rate) {
     }
 }
 
-void CTxMemPool::TrimToSize(size_t sizelimit) {
+void CTxMemPool::TrimToSize(size_t sizelimit, std::vector<uint256>* pvNoSpendsRemaining) {
     LOCK(cs);
 
     unsigned nTxnRemoved = 0;
@@ -963,8 +963,26 @@ void CTxMemPool::TrimToSize(size_t sizelimit) {
 
         setEntries stage;
         CalculateDescendants(mapTx.project<0>(it), stage);
-        RemoveStaged(stage);
         nTxnRemoved += stage.size();
+
+        std::vector<CTransaction> txn;
+        if (pvNoSpendsRemaining) {
+            txn.reserve(stage.size());
+            BOOST_FOREACH(txiter it, stage)
+                txn.push_back(it->GetTx());
+        }
+        RemoveStaged(stage);
+        if (pvNoSpendsRemaining) {
+            BOOST_FOREACH(const CTransaction& tx, txn) {
+                BOOST_FOREACH(const CTxIn& txin, tx.vin) {
+                    if (exists(txin.prevout.hash))
+                        continue;
+                    std::map<COutPoint, CInPoint>::iterator it = mapNextTx.lower_bound(COutPoint(txin.prevout.hash, 0));
+                    if (it == mapNextTx.end() || it->first.hash != txin.prevout.hash)
+                        pvNoSpendsRemaining->push_back(txin.prevout.hash);
+                }
+            }
+        }
     }
 
     if (maxFeeRateRemoved > CFeeRate(0))