7705b23f24
Transactions can no longer serve as callers. Accounts are now the initial callee of closures. Transactions now serve as transport to call closures.
77 lines
1.5 KiB
Go
77 lines
1.5 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 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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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) 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) GetGas() *big.Int {
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return c.gas
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}
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