83663ed4b0
* Renamed a couple more chain => core * Updated VM `pc` to be uint64 rather than big int * XEth interface cleanup
137 lines
2.7 KiB
Go
137 lines
2.7 KiB
Go
package vm
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/ethutil"
|
|
"github.com/ethereum/go-ethereum/state"
|
|
)
|
|
|
|
type ClosureRef interface {
|
|
ReturnGas(*big.Int, *big.Int)
|
|
Address() []byte
|
|
SetCode([]byte)
|
|
GetStorage(*big.Int) *ethutil.Value
|
|
SetStorage(*big.Int, *ethutil.Value)
|
|
}
|
|
|
|
type Closure struct {
|
|
caller ClosureRef
|
|
object ClosureRef
|
|
Code []byte
|
|
message *state.Message
|
|
|
|
Gas, UsedGas, Price *big.Int
|
|
|
|
Args []byte
|
|
}
|
|
|
|
// Create a new closure for the given data items
|
|
func NewClosure(msg *state.Message, caller ClosureRef, object ClosureRef, code []byte, gas, price *big.Int) *Closure {
|
|
c := &Closure{message: msg, caller: caller, object: object, Code: code, Args: nil}
|
|
|
|
// Gas should be a pointer so it can safely be reduced through the run
|
|
// This pointer will be off the state transition
|
|
c.Gas = gas //new(big.Int).Set(gas)
|
|
// In most cases price and value are pointers to transaction objects
|
|
// and we don't want the transaction's values to change.
|
|
c.Price = new(big.Int).Set(price)
|
|
c.UsedGas = new(big.Int)
|
|
|
|
return c
|
|
}
|
|
|
|
func (c *Closure) GetValue(x uint64) *ethutil.Value {
|
|
return c.GetRangeValue(x, 1)
|
|
}
|
|
|
|
func (c *Closure) GetOp(x uint64) OpCode {
|
|
return OpCode(c.GetByte(x))
|
|
}
|
|
|
|
func (c *Closure) GetByte(x uint64) byte {
|
|
if x < uint64(len(c.Code)) {
|
|
return c.Code[x]
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func (c *Closure) GetBytes(x, y int) []byte {
|
|
if x >= len(c.Code) || y >= len(c.Code) {
|
|
return nil
|
|
}
|
|
|
|
return c.Code[x : x+y]
|
|
}
|
|
|
|
func (c *Closure) GetRangeValue(x, y uint64) *ethutil.Value {
|
|
if x >= uint64(len(c.Code)) || y >= uint64(len(c.Code)) {
|
|
return ethutil.NewValue(0)
|
|
}
|
|
|
|
partial := c.Code[x : x+y]
|
|
|
|
return ethutil.NewValue(partial)
|
|
}
|
|
|
|
/*
|
|
* State storage functions
|
|
*/
|
|
func (c *Closure) SetStorage(x *big.Int, val *ethutil.Value) {
|
|
c.object.SetStorage(x, val)
|
|
}
|
|
|
|
func (c *Closure) GetStorage(x *big.Int) *ethutil.Value {
|
|
m := c.object.GetStorage(x)
|
|
if m == nil {
|
|
return ethutil.EmptyValue()
|
|
}
|
|
|
|
return m
|
|
}
|
|
|
|
func (c *Closure) Return(ret []byte) []byte {
|
|
// Return the remaining gas to the caller
|
|
c.caller.ReturnGas(c.Gas, c.Price)
|
|
|
|
return ret
|
|
}
|
|
|
|
/*
|
|
* Gas functions
|
|
*/
|
|
func (c *Closure) UseGas(gas *big.Int) bool {
|
|
if c.Gas.Cmp(gas) < 0 {
|
|
return false
|
|
}
|
|
|
|
// Sub the amount of gas from the remaining
|
|
c.Gas.Sub(c.Gas, gas)
|
|
c.UsedGas.Add(c.UsedGas, gas)
|
|
|
|
return true
|
|
}
|
|
|
|
// Implement the caller interface
|
|
func (c *Closure) ReturnGas(gas, price *big.Int) {
|
|
// Return the gas to the closure
|
|
c.Gas.Add(c.Gas, gas)
|
|
c.UsedGas.Sub(c.UsedGas, gas)
|
|
}
|
|
|
|
/*
|
|
* Set / Get
|
|
*/
|
|
func (c *Closure) Caller() ClosureRef {
|
|
return c.caller
|
|
}
|
|
|
|
func (c *Closure) Address() []byte {
|
|
return c.object.Address()
|
|
}
|
|
|
|
func (self *Closure) SetCode(code []byte) {
|
|
self.Code = code
|
|
}
|