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This commit is contained in:
obscuren
2014-04-20 01:31:01 +02:00
parent a96c8c8af9
commit 6930260962
4 changed files with 90 additions and 37 deletions
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54
ethchain/vm.go
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@ -102,10 +102,9 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
}
*/
// TODO Get each instruction cost properly
gas := new(big.Int)
useGas := func(amount *big.Int) {
gas.Add(gas, new(big.Int).Mul(amount, closure.Price))
gas.Add(gas, amount)
}
switch op {
@ -142,6 +141,8 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
return closure.Return(nil), fmt.Errorf("insufficient gas %v %v", closure.Gas, gas)
}
// Sub the amount of gas from the remaining
closure.Gas.Sub(closure.Gas, gas)
switch op {
@ -157,7 +158,6 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
x, y := stack.Popn()
// (x + y) % 2 ** 256
base.Add(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
stack.Push(base)
case oSUB:
@ -165,7 +165,6 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
x, y := stack.Popn()
// (x - y) % 2 ** 256
base.Sub(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
stack.Push(base)
case oMUL:
@ -173,7 +172,6 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
x, y := stack.Popn()
// (x * y) % 2 ** 256
base.Mul(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
stack.Push(base)
case oDIV:
@ -325,7 +323,7 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
case oCALLDATASIZE:
stack.Push(big.NewInt(int64(len(closure.Args))))
case oGASPRICE:
// TODO
stack.Push(closure.Price)
// 0x40 range
case oPREVHASH:
@ -339,7 +337,8 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
case oDIFFICULTY:
stack.Push(vm.vars.Diff)
case oGASLIMIT:
// TODO
// TODO
stack.Push(big.NewInt(0))
// 0x50 range
case oPUSH: // Push PC+1 on to the stack
@ -399,11 +398,14 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
case oJUMP:
require(1)
pc = stack.Pop()
// Reduce pc by one because of the increment that's at the end of this for loop
pc.Sub(pc, ethutil.Big1)
case oJUMPI:
require(2)
cond, pos := stack.Popn()
if cond.Cmp(ethutil.BigTrue) == 0 {
pc = pos
pc.Sub(pc, ethutil.Big1)
}
case oPC:
stack.Push(pc)
@ -421,21 +423,39 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
inSize, inOffset := stack.Popn()
// Pop return size and offset
retSize, retOffset := stack.Popn()
// Make sure there's enough gas
if closure.Gas.Cmp(gas) < 0 {
stack.Push(ethutil.BigFalse)
break
}
// Get the arguments from the memory
args := mem.Get(inOffset.Int64(), inSize.Int64())
// Fetch the contract which will serve as the closure body
contract := vm.state.GetContract(addr.Bytes())
// Create a new callable closure
closure := NewClosure(closure, contract, contract.script, vm.state, gas, closure.Price, value)
// Executer the closure and get the return value (if any)
ret, err := closure.Call(vm, args, hook)
if err != nil {
stack.Push(ethutil.BigFalse)
} else {
stack.Push(ethutil.BigTrue)
}
mem.Set(retOffset.Int64(), retSize.Int64(), ret)
if contract != nil {
// Prepay for the gas
// If gas is set to 0 use all remaining gas for the next call
if gas.Cmp(big.NewInt(0)) == 0 {
gas = closure.Gas
}
closure.Gas.Sub(closure.Gas, gas)
// Create a new callable closure
closure := NewClosure(closure, contract, contract.script, vm.state, gas, closure.Price, value)
// Executer the closure and get the return value (if any)
ret, err := closure.Call(vm, args, hook)
if err != nil {
stack.Push(ethutil.BigFalse)
} else {
stack.Push(ethutil.BigTrue)
}
mem.Set(retOffset.Int64(), retSize.Int64(), ret)
} else {
ethutil.Config.Log.Debugf("Contract %x not found\n", addr.Bytes())
stack.Push(ethutil.BigFalse)
}
case oRETURN:
require(2)
size, offset := stack.Popn()