86 lines
1.7 KiB
Go
86 lines
1.7 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 Callee interface {
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ReturnGas(*big.Int, *State)
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Address() []byte
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}
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type ClosureBody interface {
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Callee
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ethutil.RlpEncodable
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GetMem(int64) *ethutil.Value
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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 Callee
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object ClosureBody
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State *State
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Gas *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 Callee, object ClosureBody, state *State, gas, val *big.Int) *Closure {
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return &Closure{callee, object, state, gas, val, nil}
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}
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// Retuns the x element in data slice
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func (c *Closure) GetMem(x int64) *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) Address() []byte {
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return c.object.Address()
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}
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func (c *Closure) Call(vm *Vm, args []byte) []byte {
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c.Args = args
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return vm.RunClosure(c)
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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.State)
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} else {
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c.object.ReturnGas(c.Gas, c.State)
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// TODO incase it's a POST contract we gotta serialise the contract again.
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// But it's not yet defined
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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 *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() ClosureBody {
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return c.object
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}
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func (c *Closure) Callee() Callee {
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return c.callee
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}
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