"Modified dirty" SSTORE result status, required for net gas metering of Constantinople
MODIFY
include/evmc/evmc.h
include/evmc/evmc.h
@@ -450,7 +450,12 @@ enum evmc_storage_status
/**
* A storage item has been deleted: X -> 0.
*/
- EVMC_STORAGE_DELETED = 3
+ EVMC_STORAGE_DELETED = 3,
+
+ /**
+ * A storage item has been modified after being modified before: X -> Y -> Z.
+ */
+ EVMC_STORAGE_MODIFIED_DIRTY = 4
};

"Modified dirty" SSTORE result status, required for net gas metering of Constantinople