Use unique_ptr for pcoinscatcher/pcoinsdbview/pcoinsTip/pblocktree

* pcoinscatcher (CCoinsViewErrorCatcher)
* pcoinsdbview (CCoinsViewDB)
* pcoinsTip (CCoinsViewCache)
* pblocktree (CBlockTreeDB)
* Remove variables shadowing pcoinsdbview

9 files changed, 47 insertions, 57 deletions

diff --git a/src/init.cpp b/src/init.cpp
index ddac606a39..7ac2cf2d32 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -152,7 +152,7 @@ public:
     // Writes do not need similar protection, as failure to write is handled by the caller.
 };
 
-static CCoinsViewErrorCatcher *pcoinscatcher = nullptr;
+static std::unique_ptr<CCoinsViewErrorCatcher> pcoinscatcher;
 static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;
 
 void Interrupt(boost::thread_group& threadGroup)
@@ -235,14 +235,10 @@ void Shutdown()
         if (pcoinsTip != nullptr) {
             FlushStateToDisk();
         }
-        delete pcoinsTip;
-        pcoinsTip = nullptr;
-        delete pcoinscatcher;
-        pcoinscatcher = nullptr;
-        delete pcoinsdbview;
-        pcoinsdbview = nullptr;
-        delete pblocktree;
-        pblocktree = nullptr;
+        pcoinsTip.reset();
+        pcoinscatcher.reset();
+        pcoinsdbview.reset();
+        pblocktree.reset();
     }
 #ifdef ENABLE_WALLET
     StopWallets();
@@ -1406,12 +1402,10 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         do {
             try {
                 UnloadBlockIndex();
-                delete pcoinsTip;
-                delete pcoinsdbview;
-                delete pcoinscatcher;
-                delete pblocktree;
-
-                pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReset);
+                pcoinsTip.reset();
+                pcoinsdbview.reset();
+                pcoinscatcher.reset();
+                pblocktree.reset(new CBlockTreeDB(nBlockTreeDBCache, false, fReset));
 
                 if (fReset) {
                     pblocktree->WriteReindexing(true);
@@ -1462,8 +1456,8 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                 // At this point we're either in reindex or we've loaded a useful
                 // block tree into mapBlockIndex!
 
-                pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReset || fReindexChainState);
-                pcoinscatcher = new CCoinsViewErrorCatcher(pcoinsdbview);
+                pcoinsdbview.reset(new CCoinsViewDB(nCoinDBCache, false, fReset || fReindexChainState));
+                pcoinscatcher.reset(new CCoinsViewErrorCatcher(pcoinsdbview.get()));
 
                 // If necessary, upgrade from older database format.
                 // This is a no-op if we cleared the coinsviewdb with -reindex or -reindex-chainstate
@@ -1473,13 +1467,13 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                 }
 
                 // ReplayBlocks is a no-op if we cleared the coinsviewdb with -reindex or -reindex-chainstate
-                if (!ReplayBlocks(chainparams, pcoinsdbview)) {
+                if (!ReplayBlocks(chainparams, pcoinsdbview.get())) {
                     strLoadError = _("Unable to replay blocks. You will need to rebuild the database using -reindex-chainstate.");
                     break;
                 }
 
                 // The on-disk coinsdb is now in a good state, create the cache
-                pcoinsTip = new CCoinsViewCache(pcoinscatcher);
+                pcoinsTip.reset(new CCoinsViewCache(pcoinscatcher.get()));
 
                 bool is_coinsview_empty = fReset || fReindexChainState || pcoinsTip->GetBestBlock().IsNull();
                 if (!is_coinsview_empty) {
@@ -1521,7 +1515,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
                         }
                     }
 
-                    if (!CVerifyDB().VerifyDB(chainparams, pcoinsdbview, gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL),
+                    if (!CVerifyDB().VerifyDB(chainparams, pcoinsdbview.get(), gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL),
                                   gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS))) {
                         strLoadError = _("Corrupted block database detected");
                         break;
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 3b26a98f45..ff6f796b33 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -2106,7 +2106,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
         if (!AlreadyHave(inv) &&
             AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
-            mempool.check(pcoinsTip);
+            mempool.check(pcoinsTip.get());
             RelayTransaction(tx, connman);
             for (unsigned int i = 0; i < tx.vout.size(); i++) {
                 vWorkQueue.emplace_back(inv.hash, i);
@@ -2173,7 +2173,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                             recentRejects->insert(orphanHash);
                         }
                     }
-                    mempool.check(pcoinsTip);
+                    mempool.check(pcoinsTip.get());
                 }
             }
 
diff --git a/src/qt/test/rpcnestedtests.h b/src/qt/test/rpcnestedtests.h
index 9ad409019f..59d7f37841 100644
--- a/src/qt/test/rpcnestedtests.h
+++ b/src/qt/test/rpcnestedtests.h
@@ -17,9 +17,6 @@ class RPCNestedTests : public QObject
 
     private Q_SLOTS:
     void rpcNestedTests();
-
-private:
-    CCoinsViewDB *pcoinsdbview;
 };
 
 #endif // BITCOIN_QT_TEST_RPC_NESTED_TESTS_H
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 8d01d8ba9c..4a3404308d 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -928,7 +928,7 @@ UniValue gettxoutsetinfo(const JSONRPCRequest& request)
 
     CCoinsStats stats;
     FlushStateToDisk();
-    if (GetUTXOStats(pcoinsdbview, stats)) {
+    if (GetUTXOStats(pcoinsdbview.get(), stats)) {
         ret.push_back(Pair("height", (int64_t)stats.nHeight));
         ret.push_back(Pair("bestblock", stats.hashBlock.GetHex()));
         ret.push_back(Pair("transactions", (int64_t)stats.nTransactions));
@@ -996,7 +996,7 @@ UniValue gettxout(const JSONRPCRequest& request)
     Coin coin;
     if (fMempool) {
         LOCK(mempool.cs);
-        CCoinsViewMemPool view(pcoinsTip, mempool);
+        CCoinsViewMemPool view(pcoinsTip.get(), mempool);
         if (!view.GetCoin(out, coin) || mempool.isSpent(out)) {
             return NullUniValue;
         }
@@ -1048,7 +1048,7 @@ UniValue verifychain(const JSONRPCRequest& request)
     if (!request.params[1].isNull())
         nCheckDepth = request.params[1].get_int();
 
-    return CVerifyDB().VerifyDB(Params(), pcoinsTip, nCheckLevel, nCheckDepth);
+    return CVerifyDB().VerifyDB(Params(), pcoinsTip.get(), nCheckLevel, nCheckDepth);
 }
 
 /** Implementation of IsSuperMajority with better feedback */
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index f9ce52c594..0d7d52478f 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -81,9 +81,9 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
         GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
 
         mempool.setSanityCheck(1.0);
-        pblocktree = new CBlockTreeDB(1 << 20, true);
-        pcoinsdbview = new CCoinsViewDB(1 << 23, true);
-        pcoinsTip = new CCoinsViewCache(pcoinsdbview);
+        pblocktree.reset(new CBlockTreeDB(1 << 20, true));
+        pcoinsdbview.reset(new CCoinsViewDB(1 << 23, true));
+        pcoinsTip.reset(new CCoinsViewCache(pcoinsdbview.get()));
         if (!LoadGenesisBlock(chainparams)) {
             throw std::runtime_error("LoadGenesisBlock failed.");
         }
@@ -110,9 +110,9 @@ TestingSetup::~TestingSetup()
         g_connman.reset();
         peerLogic.reset();
         UnloadBlockIndex();
-        delete pcoinsTip;
-        delete pcoinsdbview;
-        delete pblocktree;
+        pcoinsTip.reset();
+        pcoinsdbview.reset();
+        pblocktree.reset();
         fs::remove_all(pathTemp);
 }
 
diff --git a/src/test/test_bitcoin.h b/src/test/test_bitcoin.h
index 62ded2aaf5..6398386d42 100644
--- a/src/test/test_bitcoin.h
+++ b/src/test/test_bitcoin.h
@@ -57,7 +57,6 @@ struct CConnmanTest {
 
 class PeerLogicValidation;
 struct TestingSetup: public BasicTestingSetup {
-    CCoinsViewDB *pcoinsdbview;
     fs::path pathTemp;
     boost::thread_group threadGroup;
     CConnman* connman;
diff --git a/src/test/txvalidationcache_tests.cpp b/src/test/txvalidationcache_tests.cpp
index 82ca93e7da..7d551a7bb4 100644
--- a/src/test/txvalidationcache_tests.cpp
+++ b/src/test/txvalidationcache_tests.cpp
@@ -119,7 +119,7 @@ void ValidateCheckInputsForAllFlags(CMutableTransaction &tx, uint32_t failing_fl
             // WITNESS requires P2SH
             test_flags |= SCRIPT_VERIFY_P2SH;
         }
-        bool ret = CheckInputs(tx, state, pcoinsTip, true, test_flags, true, add_to_cache, txdata, nullptr);
+        bool ret = CheckInputs(tx, state, pcoinsTip.get(), true, test_flags, true, add_to_cache, txdata, nullptr);
         // CheckInputs should succeed iff test_flags doesn't intersect with
         // failing_flags
         bool expected_return_value = !(test_flags & failing_flags);
@@ -135,13 +135,13 @@ void ValidateCheckInputsForAllFlags(CMutableTransaction &tx, uint32_t failing_fl
         if (ret && add_to_cache) {
             // Check that we get a cache hit if the tx was valid
             std::vector<CScriptCheck> scriptchecks;
-            BOOST_CHECK(CheckInputs(tx, state, pcoinsTip, true, test_flags, true, add_to_cache, txdata, &scriptchecks));
+            BOOST_CHECK(CheckInputs(tx, state, pcoinsTip.get(), true, test_flags, true, add_to_cache, txdata, &scriptchecks));
             BOOST_CHECK(scriptchecks.empty());
         } else {
             // Check that we get script executions to check, if the transaction
             // was invalid, or we didn't add to cache.
             std::vector<CScriptCheck> scriptchecks;
-            BOOST_CHECK(CheckInputs(tx, state, pcoinsTip, true, test_flags, true, add_to_cache, txdata, &scriptchecks));
+            BOOST_CHECK(CheckInputs(tx, state, pcoinsTip.get(), true, test_flags, true, add_to_cache, txdata, &scriptchecks));
             BOOST_CHECK_EQUAL(scriptchecks.size(), tx.vin.size());
         }
     }
@@ -201,13 +201,13 @@ BOOST_FIXTURE_TEST_CASE(checkinputs_test, TestChain100Setup)
         CValidationState state;
         PrecomputedTransactionData ptd_spend_tx(spend_tx);
 
-        BOOST_CHECK(!CheckInputs(spend_tx, state, pcoinsTip, true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_DERSIG, true, true, ptd_spend_tx, nullptr));
+        BOOST_CHECK(!CheckInputs(spend_tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_DERSIG, true, true, ptd_spend_tx, nullptr));
 
         // If we call again asking for scriptchecks (as happens in
         // ConnectBlock), we should add a script check object for this -- we're
         // not caching invalidity (if that changes, delete this test case).
         std::vector<CScriptCheck> scriptchecks;
-        BOOST_CHECK(CheckInputs(spend_tx, state, pcoinsTip, true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_DERSIG, true, true, ptd_spend_tx, &scriptchecks));
+        BOOST_CHECK(CheckInputs(spend_tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_DERSIG, true, true, ptd_spend_tx, &scriptchecks));
         BOOST_CHECK_EQUAL(scriptchecks.size(), 1);
 
         // Test that CheckInputs returns true iff DERSIG-enforcing flags are
@@ -268,7 +268,7 @@ BOOST_FIXTURE_TEST_CASE(checkinputs_test, TestChain100Setup)
         invalid_with_cltv_tx.vin[0].scriptSig = CScript() << vchSig << 100;
         CValidationState state;
         PrecomputedTransactionData txdata(invalid_with_cltv_tx);
-        BOOST_CHECK(CheckInputs(invalid_with_cltv_tx, state, pcoinsTip, true, SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY, true, true, txdata, nullptr));
+        BOOST_CHECK(CheckInputs(invalid_with_cltv_tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY, true, true, txdata, nullptr));
     }
 
     // TEST CHECKSEQUENCEVERIFY
@@ -296,7 +296,7 @@ BOOST_FIXTURE_TEST_CASE(checkinputs_test, TestChain100Setup)
         invalid_with_csv_tx.vin[0].scriptSig = CScript() << vchSig << 100;
         CValidationState state;
         PrecomputedTransactionData txdata(invalid_with_csv_tx);
-        BOOST_CHECK(CheckInputs(invalid_with_csv_tx, state, pcoinsTip, true, SCRIPT_VERIFY_CHECKSEQUENCEVERIFY, true, true, txdata, nullptr));
+        BOOST_CHECK(CheckInputs(invalid_with_csv_tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_CHECKSEQUENCEVERIFY, true, true, txdata, nullptr));
     }
 
     // TODO: add tests for remaining script flags
@@ -358,12 +358,12 @@ BOOST_FIXTURE_TEST_CASE(checkinputs_test, TestChain100Setup)
         CValidationState state;
         PrecomputedTransactionData txdata(tx);
         // This transaction is now invalid under segwit, because of the second input.
-        BOOST_CHECK(!CheckInputs(tx, state, pcoinsTip, true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, true, true, txdata, nullptr));
+        BOOST_CHECK(!CheckInputs(tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, true, true, txdata, nullptr));
 
         std::vector<CScriptCheck> scriptchecks;
         // Make sure this transaction was not cached (ie because the first
         // input was valid)
-        BOOST_CHECK(CheckInputs(tx, state, pcoinsTip, true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, true, true, txdata, &scriptchecks));
+        BOOST_CHECK(CheckInputs(tx, state, pcoinsTip.get(), true, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, true, true, txdata, &scriptchecks));
         // Should get 2 script checks back -- caching is on a whole-transaction basis.
         BOOST_CHECK_EQUAL(scriptchecks.size(), 2);
     }
diff --git a/src/validation.cpp b/src/validation.cpp
index efabe6293f..e7b6fc52a8 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -201,9 +201,9 @@ CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& loc
     return chain.Genesis();
 }
 
-CCoinsViewDB *pcoinsdbview = nullptr;
-CCoinsViewCache *pcoinsTip = nullptr;
-CBlockTreeDB *pblocktree = nullptr;
+std::unique_ptr<CCoinsViewDB> pcoinsdbview;
+std::unique_ptr<CCoinsViewCache> pcoinsTip;
+std::unique_ptr<CBlockTreeDB> pblocktree;
 
 enum FlushStateMode {
     FLUSH_STATE_NONE,
@@ -295,7 +295,7 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp, bool
     }
     else {
         // pcoinsTip contains the UTXO set for chainActive.Tip()
-        CCoinsViewMemPool viewMemPool(pcoinsTip, mempool);
+        CCoinsViewMemPool viewMemPool(pcoinsTip.get(), mempool);
         std::vector<int> prevheights;
         prevheights.resize(tx.vin.size());
         for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
@@ -424,7 +424,7 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
     mempool.UpdateTransactionsFromBlock(vHashUpdate);
 
     // We also need to remove any now-immature transactions
-    mempool.removeForReorg(pcoinsTip, chainActive.Tip()->nHeight + 1, STANDARD_LOCKTIME_VERIFY_FLAGS);
+    mempool.removeForReorg(pcoinsTip.get(), chainActive.Tip()->nHeight + 1, STANDARD_LOCKTIME_VERIFY_FLAGS);
     // Re-limit mempool size, in case we added any transactions
     LimitMempoolSize(mempool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
 }
@@ -557,7 +557,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         LockPoints lp;
         {
         LOCK(pool.cs);
-        CCoinsViewMemPool viewMemPool(pcoinsTip, pool);
+        CCoinsViewMemPool viewMemPool(pcoinsTip.get(), pool);
         view.SetBackend(viewMemPool);
 
         // do all inputs exist?
@@ -2105,7 +2105,7 @@ bool static DisconnectTip(CValidationState& state, const CChainParams& chainpara
     // Apply the block atomically to the chain state.
     int64_t nStart = GetTimeMicros();
     {
-        CCoinsViewCache view(pcoinsTip);
+        CCoinsViewCache view(pcoinsTip.get());
         assert(view.GetBestBlock() == pindexDelete->GetBlockHash());
         if (DisconnectBlock(block, pindexDelete, view) != DISCONNECT_OK)
             return error("DisconnectTip(): DisconnectBlock %s failed", pindexDelete->GetBlockHash().ToString());
@@ -2235,7 +2235,7 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
     int64_t nTime3;
     LogPrint(BCLog::BENCH, "  - Load block from disk: %.2fms [%.2fs]\n", (nTime2 - nTime1) * MILLI, nTimeReadFromDisk * MICRO);
     {
-        CCoinsViewCache view(pcoinsTip);
+        CCoinsViewCache view(pcoinsTip.get());
         bool rv = ConnectBlock(blockConnecting, state, pindexNew, view, chainparams);
         GetMainSignals().BlockChecked(blockConnecting, state);
         if (!rv) {
@@ -2413,7 +2413,7 @@ static bool ActivateBestChainStep(CValidationState& state, const CChainParams& c
         // any disconnected transactions back to the mempool.
         UpdateMempoolForReorg(disconnectpool, true);
     }
-    mempool.check(pcoinsTip);
+    mempool.check(pcoinsTip.get());
 
     // Callbacks/notifications for a new best chain.
     if (fInvalidFound)
@@ -3275,7 +3275,7 @@ bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams,
 {
     AssertLockHeld(cs_main);
     assert(pindexPrev && pindexPrev == chainActive.Tip());
-    CCoinsViewCache viewNew(pcoinsTip);
+    CCoinsViewCache viewNew(pcoinsTip.get());
     CBlockIndex indexDummy(block);
     indexDummy.pprev = pindexPrev;
     indexDummy.nHeight = pindexPrev->nHeight + 1;
diff --git a/src/validation.h b/src/validation.h
index 93669de6c4..f2ffdc8993 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -444,13 +444,13 @@ bool ResetBlockFailureFlags(CBlockIndex *pindex);
 extern CChain chainActive;
 
 /** Global variable that points to the coins database (protected by cs_main) */
-extern CCoinsViewDB *pcoinsdbview;
+extern std::unique_ptr<CCoinsViewDB> pcoinsdbview;
 
 /** Global variable that points to the active CCoinsView (protected by cs_main) */
-extern CCoinsViewCache *pcoinsTip;
+extern std::unique_ptr<CCoinsViewCache> pcoinsTip;
 
 /** Global variable that points to the active block tree (protected by cs_main) */
-extern CBlockTreeDB *pblocktree;
+extern std::unique_ptr<CBlockTreeDB> pblocktree;
 
 /**
  * Return the spend height, which is one more than the inputs.GetBestBlock().