Add state.reward processing (#558)

* Add state.reward processing

test/t8n/t8n.cpp

@@ -16,6 +16,7 @@ namespace fs = std::filesystem;
 namespace json = nlohmann;
 using namespace evmone;
 using namespace evmone::test;
+using namespace std::literals;
 
 static const auto NULL_HEXSTRING_256 = "0x" + std::string(512, '0');
 static const auto NULL_HEXSTRING_32 = "0x" + std::string(64, '0');
@@ -30,6 +31,7 @@ int main(int argc, const char* argv[])
     fs::path output_dir;
     fs::path output_result_file;
     fs::path output_alloc_file;
+    std::optional<intx::uint256> block_reward;
 
     for (int i = 0; i < argc; ++i)
     {
@@ -54,6 +56,8 @@ int main(int argc, const char* argv[])
             output_result_file = argv[i];
         else if (arg == "--output.alloc" && ++i < argc)
             output_alloc_file = argv[i];
+        else if (arg == "--state.reward" && ++i < argc && argv[i] != "-1"sv)
+            block_reward = intx::from_string<intx::uint256>(argv[i]);
     }
 
     state::BlockInfo block;
@@ -128,6 +132,9 @@ int main(int argc, const char* argv[])
                 }
             }
 
+            if (block_reward.has_value())
+                state.touch(block.coinbase).balance += *block_reward;
+
             j_result["logsHash"] = hex0x(logs_hash(txs_logs));
             j_result["stateRoot"] = hex0x(state::mpt_hash(state.get_accounts()));
         }