type EVMParam struct {
    MaxStackDepth  int //Maximum stack depth
    ExternalStore  storage.IExternalStorage //External storage interface, which will be explained in detail in later chapters
    ResultCallback EVMResultCallback //Callback function after EVM execution
    Context        *environment.Context //Environment context for EVM execution, please read the source code for the meaning of internal fields
    GasSetting     *instructions.GasSetting //Custom gas cost setting for OpCode
}

type IExternalStorage interface {
    //Get the account balance of the specified address from external storage
    GetBalance(address *evmInt256.Int) (*evmInt256.Int, error)
    
    //Get the contract code of the specified address from external storage
    GetCode(address *evmInt256.Int) ([]byte, error)
    
    //Get the contract code size of the specified address from external storage
    GetCodeSize(address *evmInt256.Int) (*evmInt256.Int, error)
    
    //Get the contract code hash of the specified address from external storage
    GetCodeHash(address *evmInt256.Int) (*evmInt256.Int, error)
    
    //Get the hash of the specified block from external storage
    GetBlockHash(block *evmInt256.Int) (*evmInt256.Int, error)
    
    //When executing opcode CREAT(0xF0), this method will be called to get the address of the created contract
    CreateAddress(caller *evmInt256.Int, tx environment.Transaction) *evmInt256.Int
    
    //When executing opcode CREAT2(0xF5), this method will be called to get the address of the created contract
    CreateFixedAddress(caller *evmInt256.Int, salt *evmInt256.Int, tx environment.Transaction) *evmInt256.Int
    
    //Get from external storage whether account balance transfer can be performed
    CanTransfer(from *evmInt256.Int, to *evmInt256.Int, amount *evmInt256.Int) bool
    
    //When executing opcode SLOAD(0x54), get 256-bit data from external storage at the specified location
    //Note: The parameter n is the address of the current executing contract, and the parameter k is the key of the storage location given when executing opcode SLOAD(0x54)
    Load(n string, k string) (*evmInt256.Int, error)

    //When executing opcode TLOAD(0x5C), get 256-bit data from external transient storage at the specified location
    //Note: The parameter n is the address of the current executing contract, and the parameter k is the key of the storage location given when executing opcode TLOAD(0x5C)
    TLoad(n string, k string) (*evmInt256.Int, error)

    //External storage callback after successful execution of CREATE or CREATE2. The address and code of the newly created contract will be provided to external storage through this interface
    //Note: n is the address of the new contract, and code is the bytecode of the new contract
    NewContract(n string, code []byte) error
}

type ExecuteResult struct {
    ResultData   []byte //Data returned by contract execution
    GasLeft      uint64 //Remaining gas
    StorageCache storage.ResultCache //Cache of external state changes. External data needs to be updated according to this cache. This will be explained in detail below.
    ExitOpCode   opcodes.OpCode //The last executed opcode when execution is completed
}

type ResultCache struct {
    OriginalData CacheUnderNamespace //Cache information read from external storage during execution
    CachedData   CacheUnderNamespace //Cache all state updates at the end of execution

    TOriginalData CacheUnderNamespace //Cache information read from external transient storage during execution
    TCachedData   CacheUnderNamespace //Cache all transient state updates at the end of execution

    Balance   BalanceCache //Cache all account balance changes during execution
    Logs      LogCache //Cache all logs generated by contracts during execution
    Destructs Cache //Cache addresses of contracts that executed opcode SELFDESTRUCT(0xff)
}