69 lines
1.4 KiB
Go
69 lines
1.4 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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}
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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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val *big.Int
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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}
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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) 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) GetGas() *big.Int {
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return c.gas
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}
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