69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
|
package ethchain
|
||
|
|
|
||
|
|
// TODO Re write VM to use values instead of big integers?
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/ethereum/eth-go/ethutil"
|
||
|
|
"math/big"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Callee interface {
|
||
|
|
ReturnGas(*big.Int, *State)
|
||
|
|
}
|
||
|
|
|
||
|
|
type ClosureBody interface {
|
||
|
|
Callee
|
||
|
|
ethutil.RlpEncodable
|
||
|
|
GetMem(int64) *ethutil.Value
|
||
|
|
}
|
||
|
|
|
||
|
|
// Basic inline closure object which implement the 'closure' interface
|
||
|
|
type Closure struct {
|
||
|
|
callee Callee
|
||
|
|
object ClosureBody
|
||
|
|
state *State
|
||
|
|
|
||
|
|
gas *big.Int
|
||
|
|
val *big.Int
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create a new closure for the given data items
|
||
|
|
func NewClosure(callee Callee, object ClosureBody, state *State, gas, val *big.Int) *Closure {
|
||
|
|
return &Closure{callee, object, state, gas, val}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Retuns the x element in data slice
|
||
|
|
func (c *Closure) GetMem(x int64) *ethutil.Value {
|
||
|
|
m := c.object.GetMem(x)
|
||
|
|
if m == nil {
|
||
|
|
return ethutil.EmptyValue()
|
||
|
|
}
|
||
|
|
|
||
|
|
return m
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *Closure) Return(ret []byte) []byte {
|
||
|
|
// Return the remaining gas to the callee
|
||
|
|
// If no callee is present return it to
|
||
|
|
// the origin (i.e. contract or tx)
|
||
|
|
if c.callee != nil {
|
||
|
|
c.callee.ReturnGas(c.gas, c.state)
|
||
|
|
} else {
|
||
|
|
c.object.ReturnGas(c.gas, c.state)
|
||
|
|
// TODO incase it's a POST contract we gotta serialise the contract again.
|
||
|
|
// But it's not yet defined
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret
|
||
|
|
}
|
||
|
|
|
||
|
|
// Implement the Callee interface
|
||
|
|
func (c *Closure) ReturnGas(gas *big.Int, state *State) {
|
||
|
|
// Return the gas to the closure
|
||
|
|
c.gas.Add(c.gas, gas)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *Closure) GetGas() *big.Int {
|
||
|
|
return c.gas
|
||
|
|
}
|