Decouple miner.o and txmempool.o from CTxUndo

src/main.cpp

@@ -1404,6 +1404,12 @@ void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCach
     inputs.ModifyCoins(tx.GetHash())->FromTx(tx, nHeight);
 }
 
+void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, int nHeight)
+{
+    CTxUndo txundo;
+    UpdateCoins(tx, state, inputs, txundo, nHeight);
+}
+
 bool CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     if (!VerifyScript(scriptSig, scriptPubKey, nFlags, CachingSignatureChecker(*ptxTo, nIn, cacheStore), &error)) {

src/main.h

@@ -290,7 +290,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
                  unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks = NULL);
 
 /** Apply the effects of this transaction on the UTXO set represented by view */
-void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, CTxUndo &txundo, int nHeight);
+void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, int nHeight);
 
 /** Context-independent validity checks */
 bool CheckTransaction(const CTransaction& tx, CValidationState& state);

src/miner.cpp

@@ -279,8 +279,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
             if (!CheckInputs(tx, state, view, true, MANDATORY_SCRIPT_VERIFY_FLAGS, true))
                 continue;
 
-            CTxUndo txundo;
-            UpdateCoins(tx, state, view, txundo, nHeight);
+            UpdateCoins(tx, state, view, nHeight);
 
             // Added
             pblock->vtx.push_back(tx);

src/txmempool.cpp

@@ -585,9 +585,9 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
         if (fDependsWait)
             waitingOnDependants.push_back(&it->second);
         else {
-            CValidationState state; CTxUndo undo;
+            CValidationState state;
             assert(CheckInputs(tx, state, mempoolDuplicate, false, 0, false, NULL));
-            UpdateCoins(tx, state, mempoolDuplicate, undo, 1000000);
+            UpdateCoins(tx, state, mempoolDuplicate, 1000000);
         }
     }
     unsigned int stepsSinceLastRemove = 0;
@@ -601,8 +601,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
             assert(stepsSinceLastRemove < waitingOnDependants.size());
         } else {
             assert(CheckInputs(entry->GetTx(), state, mempoolDuplicate, false, 0, false, NULL));
-            CTxUndo undo;
-            UpdateCoins(entry->GetTx(), state, mempoolDuplicate, undo, 1000000);
+            UpdateCoins(entry->GetTx(), state, mempoolDuplicate, 1000000);
             stepsSinceLastRemove = 0;
         }
     }