Issues injecting CALLDATA and getting a return value out of it.

[Roaring30s]

New user to repo today, and just need some clarity.

const TEMP_CODE: &str = "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";

const ERCDATA: &str = "2e64cec1"

let code = hex::decode(TEMP_CODE).unwrap();
let data = hex::decode(ERCDATA).unwrap();
let mut handler = UnimplementedHandler;

let machine = Machine::new(
Rc::new(code),
Rc::new(data),
1024,
10000,
RuntimeState {
    context: Context {
        address: H160::default(),
        caller: H160::default(),
        apparent_value: U256::default(),
    },
    transaction_context: TransactionContext {
        gas_price: U256::default(),
        origin: H160::default(),
    }
    .into(),
    retbuf: Vec::new(),
},
);
let mut vm = EtableInterpreter::new(machine, &RUNTIME_ETABLE);
let res = vm.run(&mut handler).exit().unwrap();

I have fed the machine the bytecode and data variables. So far it is successfully returning the bytecode from the deployment bytecode. But now I dont know where to make subsequent CALLDATA calls to the stateful machine.

If I could get clarification on this I would appreciate it.

Also, where does one extract the storage slots of the Machine after it runs?

[sorpaas]

You will want to use the evm::transact function. The Interpreter itself does not handle call stack.

[Roaring30s]

@sorpaas

What would be a complete working example using an ERC20 contract and using calldata like retrieving the token ticker?

I am having issues using evm::transact and seeing a life example would greatly help.

Grateful for your help.