Call _deploy during deploy and update

src/neo/SmartContract/ApplicationEngine.Contract.cs

@@ -50,6 +50,34 @@ protected internal ContractState CreateContract(byte[] script, byte[] manifest)
             if (!contract.Manifest.IsValid(hash)) throw new InvalidOperationException($"Invalid Manifest Hash: {hash}");
 
             Snapshot.Contracts.Add(hash, contract);
+
+            // Execute _deploy
+
+            ContractMethodDescriptor md = contract.Manifest.Abi.GetMethod("_deploy");
+            if (md is null) return contract;
+
+            if (invocationCounter.TryGetValue(contract.ScriptHash, out var counter))
+            {
+                invocationCounter[contract.ScriptHash] = counter + 1;
+            }
+            else
+            {
+                invocationCounter[contract.ScriptHash] = 1;
+            }
+
+            GetInvocationState(CurrentContext).NeedCheckReturnValue = true;
+            ExecutionContextState state = CurrentContext.GetState<ExecutionContextState>();
+            UInt160 callingScriptHash = state.ScriptHash;
+            CallFlags callingFlags = state.CallFlags;
+
+            ExecutionContext context_new = LoadScript(contract.Script, md.Offset);
+            state = context_new.GetState<ExecutionContextState>();
+            state.CallingScriptHash = callingScriptHash;
+            state.CallFlags = callingFlags;
+
+            md = contract.Manifest.Abi.GetMethod("_initialize");
+            if (md != null) LoadContext(context_new.Clone(md.Offset));
+
             return contract;
         }