Log the sizes of various datastructures about nullifiers when NullifierCount() is called, if -zdebug

src/coins.cpp

@@ -52,6 +52,11 @@ void CCoins::CalcMaskSize(unsigned int &nBytes, unsigned int &nNonzeroBytes) con
     nBytes += nLastUsedByte;
 }
 
+CNullifiersMap CCoinsViewCache::getNullifiers()
+{
+    return cacheSaplingNullifiers;
+}
+
 bool CCoins::Spend(uint32_t nPos) 
 {
     if (nPos >= vout.size() || vout[nPos].IsNull())

src/coins.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2014 The Bitcoin Core developers
-// Copyright (c) 2019      The Hush developers
+// Copyright (c) 2019-2020 The Hush developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -490,8 +490,9 @@ public:
     CCoinsViewCache(CCoinsView *baseIn);
     ~CCoinsViewCache();
 
+    CNullifiersMap getNullifiers();
+
     // Standard CCoinsView methods
-    //static CLaunchMap &LaunchMap() { return launchMap; }
     bool GetSproutAnchorAt(const uint256 &rt, SproutMerkleTree &tree) const;
     bool GetSaplingAnchorAt(const uint256 &rt, SaplingMerkleTree &tree) const;
     bool GetNullifier(const uint256 &nullifier, ShieldedType type) const;

src/wallet/rpcwallet.cpp

@@ -3764,9 +3764,9 @@ UniValue z_listnullifiers(const UniValue& params, bool fHelp, const CPubKey& myp
 
     LOCK2(cs_main, pwalletMain->cs_wallet);
     UniValue ret(UniValue::VARR);
-    //for (auto nullifier: mempool.getNullifiers()) {
-    //   ret.push_back(nullifier.GetHex());
-    //}
+    for (auto nullifier: mempool.getNullifiers()) {
+        ret.push_back(nullifier.first.GetHex());
+    }
     return ret;
 }
 

src/wallet/wallet.cpp

@@ -970,7 +970,13 @@ std::set<uint256> CWallet::GetNullifiers()
 int64_t CWallet::NullifierCount()
 {
     LOCK(cs_wallet);
-    return mempool.getNullifiers().size();
+    //return mempool.getNullifiers().size();
+    if(fZdebug) {
+        fprintf(stderr,"%s:mapTxSaplingNullifers.size=%d\n",__FUNCTION__,(int)mapTxSaplingNullifiers.size() );
+        fprintf(stderr,"%s:mempool.getNullifiers.size=%d\n",__FUNCTION__,(int)mempool.getNullifiers().size() );
+        fprintf(stderr,"%s:cacheSaplingNullifiers.size=%d\n",__FUNCTION__,(int)pcoinsTip->getNullifiers().size() );
+    }
+    return mapTxSaplingNullifiers.size();
 }