115 lines
2.5 KiB
Go
115 lines
2.5 KiB
Go
package ethchain
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// TODO Re write VM to use values instead of big integers?
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import (
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"github.com/ethereum/eth-go/ethutil"
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"math/big"
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)
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type ClosureRef interface {
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ReturnGas(*big.Int, *big.Int, *State)
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Address() []byte
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GetMem(*big.Int) *ethutil.Value
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SetMem(*big.Int, *ethutil.Value)
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N() *big.Int
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}
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// Basic inline closure object which implement the 'closure' interface
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type Closure struct {
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callee *StateObject
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object *StateObject
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Script []byte
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State *State
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Gas *big.Int
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Price *big.Int
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Value *big.Int
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Args []byte
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}
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// Create a new closure for the given data items
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func NewClosure(callee, object *StateObject, script []byte, state *State, gas, price, val *big.Int) *Closure {
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c := &Closure{callee: callee, object: object, Script: script, State: state, Args: nil}
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// In most cases gas, price and value are pointers to transaction objects
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// and we don't want the transaction's values to change.
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c.Gas = new(big.Int).Set(gas)
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c.Price = new(big.Int).Set(price)
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c.Value = new(big.Int).Set(val)
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return c
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}
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// Retuns the x element in data slice
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func (c *Closure) GetMem(x *big.Int) *ethutil.Value {
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m := c.object.GetMem(x)
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if m == nil {
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return ethutil.EmptyValue()
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}
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return m
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}
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func (c *Closure) Get(x *big.Int) *ethutil.Value {
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return c.Gets(x, big.NewInt(1))
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}
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func (c *Closure) Gets(x, y *big.Int) *ethutil.Value {
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if x.Int64() >= int64(len(c.Script)) || y.Int64() >= int64(len(c.Script)) {
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return ethutil.NewValue(0)
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}
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partial := c.Script[x.Int64() : x.Int64()+y.Int64()]
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return ethutil.NewValue(partial)
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}
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func (c *Closure) SetMem(x *big.Int, val *ethutil.Value) {
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c.object.SetMem(x, val)
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}
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func (c *Closure) Address() []byte {
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return c.object.Address()
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}
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type DebugHook func(step int, op OpCode, mem *Memory, stack *Stack)
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func (c *Closure) Call(vm *Vm, args []byte, hook DebugHook) ([]byte, error) {
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c.Args = args
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return vm.RunClosure(c, hook)
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}
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func (c *Closure) Return(ret []byte) []byte {
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// Return the remaining gas to the callee
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// If no callee is present return it to
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// the origin (i.e. contract or tx)
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if c.callee != nil {
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c.callee.ReturnGas(c.Gas, c.Price, c.State)
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} else {
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c.object.ReturnGas(c.Gas, c.Price, c.State)
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}
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return ret
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}
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// Implement the Callee interface
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func (c *Closure) ReturnGas(gas, price *big.Int, state *State) {
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// Return the gas to the closure
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c.Gas.Add(c.Gas, gas)
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}
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func (c *Closure) Object() *StateObject {
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return c.object
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}
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func (c *Closure) Callee() *StateObject {
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return c.callee
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}
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func (c *Closure) N() *big.Int {
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return c.object.N()
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}
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