Merge #10953: [Refactor] Combine scriptPubKey and amount as CTxOut in CScriptCheck

3a131b724 Rename out to m_tx_out in CScriptCheck (Johnson Lau)
e91211878 [Refactor] Combine scriptPubKey and amount as CTxOut in CScriptCheck (Johnson Lau)

Pull request description:

  This simplifies CScriptCheck by combining scriptPubKey and amount

Tree-SHA512: 6422363cf5394c6cfefb30c1709db6def63230b809cc7697887e4a2e8c684149208edf91dd139e031b9fe732776b2db59305f77c3cba6f333b11cceb39ef0cc2

src/test/script_P2SH_tests.cpp

@@ -112,8 +112,7 @@ BOOST_AUTO_TEST_CASE(sign)
         {
             CScript sigSave = txTo[i].vin[0].scriptSig;
             txTo[i].vin[0].scriptSig = txTo[j].vin[0].scriptSig;
-            const CTxOut& output = txFrom.vout[txTo[i].vin[0].prevout.n];
-            bool sigOK = CScriptCheck(output.scriptPubKey, output.nValue, txTo[i], 0, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, false, &txdata)();
+            bool sigOK = CScriptCheck(txFrom.vout[txTo[i].vin[0].prevout.n], txTo[i], 0, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, false, &txdata)();
             if (i == j)
                 BOOST_CHECK_MESSAGE(sigOK, strprintf("VerifySignature %d %d", i, j));
             else

src/test/transaction_tests.cpp

@@ -480,8 +480,7 @@ BOOST_AUTO_TEST_CASE(test_big_witness_transaction) {
 
     for(uint32_t i = 0; i < mtx.vin.size(); i++) {
         std::vector<CScriptCheck> vChecks;
-        const CTxOut& output = coins[tx.vin[i].prevout.n].out;
-        CScriptCheck check(output.scriptPubKey, output.nValue, tx, i, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, false, &txdata);
+        CScriptCheck check(coins[tx.vin[i].prevout.n].out, tx, i, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS, false, &txdata);
         vChecks.push_back(CScriptCheck());
         check.swap(vChecks.back());
         control.Add(vChecks);

src/validation.cpp

@@ -1203,7 +1203,7 @@ void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, int nHeight)
 bool CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     const CScriptWitness *witness = &ptxTo->vin[nIn].scriptWitness;
-    return VerifyScript(scriptSig, scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, amount, cacheStore, *txdata), &error);
+    return VerifyScript(scriptSig, m_tx_out.scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, m_tx_out.nValue, cacheStore, *txdata), &error);
 }
 
 int GetSpendHeight(const CCoinsViewCache& inputs)
@@ -1285,11 +1285,9 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
                 // a sanity check that our caching is not introducing consensus
                 // failures through additional data in, eg, the coins being
                 // spent being checked as a part of CScriptCheck.
-                const CScript& scriptPubKey = coin.out.scriptPubKey;
-                const CAmount amount = coin.out.nValue;
 
                 // Verify signature
-                CScriptCheck check(scriptPubKey, amount, tx, i, flags, cacheSigStore, &txdata);
+                CScriptCheck check(coin.out, tx, i, flags, cacheSigStore, &txdata);
                 if (pvChecks) {
                     pvChecks->push_back(CScriptCheck());
                     check.swap(pvChecks->back());
@@ -1301,7 +1299,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
                         // arguments; if so, don't trigger DoS protection to
                         // avoid splitting the network between upgraded and
                         // non-upgraded nodes.
-                        CScriptCheck check2(scriptPubKey, amount, tx, i,
+                        CScriptCheck check2(coin.out, tx, i,
                                 flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, cacheSigStore, &txdata);
                         if (check2())
                             return state.Invalid(false, REJECT_NONSTANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError())));

src/validation.h

@@ -357,8 +357,7 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = null
 class CScriptCheck
 {
 private:
-    CScript scriptPubKey;
-    CAmount amount;
+    CTxOut m_tx_out;
     const CTransaction *ptxTo;
     unsigned int nIn;
     unsigned int nFlags;
@@ -367,17 +366,15 @@ private:
     PrecomputedTransactionData *txdata;
 
 public:
-    CScriptCheck(): amount(0), ptxTo(nullptr), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
-    CScriptCheck(const CScript& scriptPubKeyIn, const CAmount amountIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
-        scriptPubKey(scriptPubKeyIn), amount(amountIn),
-        ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata(txdataIn) { }
+    CScriptCheck(): ptxTo(nullptr), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
+    CScriptCheck(const CTxOut& outIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
+        m_tx_out(outIn), ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata(txdataIn) { }
 
     bool operator()();
 
     void swap(CScriptCheck &check) {
-        scriptPubKey.swap(check.scriptPubKey);
         std::swap(ptxTo, check.ptxTo);
-        std::swap(amount, check.amount);
+        std::swap(m_tx_out, check.m_tx_out);
         std::swap(nIn, check.nIn);
         std::swap(nFlags, check.nFlags);
         std::swap(cacheStore, check.cacheStore);