mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-29 06:47:16 +00:00
558 lines
13 KiB
Go
558 lines
13 KiB
Go
package ethchain
|
|
|
|
import (
|
|
_ "bytes"
|
|
"fmt"
|
|
"github.com/ethereum/eth-go/ethutil"
|
|
_ "github.com/obscuren/secp256k1-go"
|
|
_ "math"
|
|
"math/big"
|
|
)
|
|
|
|
var (
|
|
GasStep = big.NewInt(1)
|
|
GasSha = big.NewInt(20)
|
|
GasSLoad = big.NewInt(20)
|
|
GasSStore = big.NewInt(100)
|
|
GasBalance = big.NewInt(20)
|
|
GasCreate = big.NewInt(100)
|
|
GasCall = big.NewInt(20)
|
|
GasMemory = big.NewInt(1)
|
|
GasTx = big.NewInt(500)
|
|
)
|
|
|
|
func CalculateTxGas(initSize *big.Int) *big.Int {
|
|
totalGas := new(big.Int)
|
|
|
|
txTotalBytes := new(big.Int).Set(initSize)
|
|
txTotalBytes.Div(txTotalBytes, ethutil.Big32)
|
|
totalGas.Add(totalGas, new(big.Int).Mul(txTotalBytes, GasSStore))
|
|
|
|
return totalGas
|
|
}
|
|
|
|
type Vm struct {
|
|
txPool *TxPool
|
|
// Stack for processing contracts
|
|
stack *Stack
|
|
// non-persistent key/value memory storage
|
|
mem map[string]*big.Int
|
|
|
|
vars RuntimeVars
|
|
|
|
state *State
|
|
|
|
stateManager *StateManager
|
|
}
|
|
|
|
type RuntimeVars struct {
|
|
Origin []byte
|
|
BlockNumber uint64
|
|
PrevHash []byte
|
|
Coinbase []byte
|
|
Time int64
|
|
Diff *big.Int
|
|
TxData []string
|
|
Value *big.Int
|
|
}
|
|
|
|
func NewVm(state *State, stateManager *StateManager, vars RuntimeVars) *Vm {
|
|
return &Vm{vars: vars, state: state, stateManager: stateManager}
|
|
}
|
|
|
|
var Pow256 = ethutil.BigPow(2, 256)
|
|
|
|
var isRequireError = false
|
|
|
|
func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err error) {
|
|
// Recover from any require exception
|
|
defer func() {
|
|
if r := recover(); r != nil /*&& isRequireError*/ {
|
|
ret = closure.Return(nil)
|
|
err = fmt.Errorf("%v", r)
|
|
fmt.Println("vm err", err)
|
|
}
|
|
}()
|
|
|
|
ethutil.Config.Log.Debugf("[VM] Running closure %x\n", closure.object.Address())
|
|
|
|
// Memory for the current closure
|
|
mem := &Memory{}
|
|
// New stack (should this be shared?)
|
|
stack := NewStack()
|
|
require := func(m int) {
|
|
if stack.Len() < m {
|
|
isRequireError = true
|
|
panic(fmt.Sprintf("stack = %d, req = %d", stack.Len(), m))
|
|
}
|
|
}
|
|
|
|
// Instruction pointer
|
|
pc := big.NewInt(0)
|
|
// Current step count
|
|
step := 0
|
|
prevStep := 0
|
|
|
|
if ethutil.Config.Debug {
|
|
ethutil.Config.Log.Debugf("# op\n")
|
|
}
|
|
|
|
for {
|
|
prevStep = step
|
|
// The base for all big integer arithmetic
|
|
base := new(big.Int)
|
|
|
|
step++
|
|
// Get the memory location of pc
|
|
val := closure.Get(pc)
|
|
// Get the opcode (it must be an opcode!)
|
|
op := OpCode(val.Uint())
|
|
if ethutil.Config.Debug {
|
|
ethutil.Config.Log.Debugf("%-3d %-4s", pc, op.String())
|
|
}
|
|
|
|
gas := new(big.Int)
|
|
setStepGasUsage := func(amount *big.Int) {
|
|
gas.Add(gas, amount)
|
|
}
|
|
|
|
switch op {
|
|
case SHA3:
|
|
setStepGasUsage(GasSha)
|
|
case SLOAD:
|
|
setStepGasUsage(GasSLoad)
|
|
case SSTORE:
|
|
var mult *big.Int
|
|
y, x := stack.Peekn()
|
|
val := closure.GetMem(x)
|
|
if val.IsEmpty() && len(y.Bytes()) > 0 {
|
|
mult = ethutil.Big2
|
|
} else if !val.IsEmpty() && len(y.Bytes()) == 0 {
|
|
mult = ethutil.Big0
|
|
} else {
|
|
mult = ethutil.Big1
|
|
}
|
|
setStepGasUsage(new(big.Int).Mul(mult, GasSStore))
|
|
case BALANCE:
|
|
setStepGasUsage(GasBalance)
|
|
case CREATE:
|
|
require(3)
|
|
|
|
args := stack.Get(big.NewInt(3))
|
|
initSize := new(big.Int).Add(args[1], args[0])
|
|
|
|
setStepGasUsage(CalculateTxGas(initSize))
|
|
case CALL:
|
|
setStepGasUsage(GasCall)
|
|
case MLOAD, MSIZE, MSTORE8, MSTORE:
|
|
setStepGasUsage(GasMemory)
|
|
default:
|
|
setStepGasUsage(GasStep)
|
|
}
|
|
|
|
if !closure.UseGas(gas) {
|
|
ethutil.Config.Log.Debugln("Insufficient gas", closure.Gas, gas)
|
|
|
|
return closure.Return(nil), fmt.Errorf("insufficient gas %v %v", closure.Gas, gas)
|
|
}
|
|
|
|
switch op {
|
|
case LOG:
|
|
stack.Print()
|
|
mem.Print()
|
|
// 0x20 range
|
|
case ADD:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// (x + y) % 2 ** 256
|
|
base.Add(x, y)
|
|
// Pop result back on the stack
|
|
stack.Push(base)
|
|
case SUB:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// (x - y) % 2 ** 256
|
|
base.Sub(x, y)
|
|
// Pop result back on the stack
|
|
stack.Push(base)
|
|
case MUL:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// (x * y) % 2 ** 256
|
|
base.Mul(x, y)
|
|
// Pop result back on the stack
|
|
stack.Push(base)
|
|
case DIV:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// floor(x / y)
|
|
base.Div(x, y)
|
|
// Pop result back on the stack
|
|
stack.Push(base)
|
|
case SDIV:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// n > 2**255
|
|
if x.Cmp(Pow256) > 0 {
|
|
x.Sub(Pow256, x)
|
|
}
|
|
if y.Cmp(Pow256) > 0 {
|
|
y.Sub(Pow256, y)
|
|
}
|
|
z := new(big.Int)
|
|
z.Div(x, y)
|
|
if z.Cmp(Pow256) > 0 {
|
|
z.Sub(Pow256, z)
|
|
}
|
|
// Push result on to the stack
|
|
stack.Push(z)
|
|
case MOD:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
base.Mod(x, y)
|
|
stack.Push(base)
|
|
case SMOD:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// n > 2**255
|
|
if x.Cmp(Pow256) > 0 {
|
|
x.Sub(Pow256, x)
|
|
}
|
|
if y.Cmp(Pow256) > 0 {
|
|
y.Sub(Pow256, y)
|
|
}
|
|
z := new(big.Int)
|
|
z.Mod(x, y)
|
|
if z.Cmp(Pow256) > 0 {
|
|
z.Sub(Pow256, z)
|
|
}
|
|
// Push result on to the stack
|
|
stack.Push(z)
|
|
case EXP:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
base.Exp(x, y, Pow256)
|
|
|
|
stack.Push(base)
|
|
case NEG:
|
|
require(1)
|
|
base.Sub(Pow256, stack.Pop())
|
|
stack.Push(base)
|
|
case LT:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// x < y
|
|
if x.Cmp(y) < 0 {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
case GT:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// x > y
|
|
if x.Cmp(y) > 0 {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
case EQ:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
// x == y
|
|
if x.Cmp(y) == 0 {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
case NOT:
|
|
require(1)
|
|
x := stack.Pop()
|
|
if x.Cmp(ethutil.BigFalse) == 0 {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
|
|
// 0x10 range
|
|
case AND:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
if (x.Cmp(ethutil.BigTrue) >= 0) && (y.Cmp(ethutil.BigTrue) >= 0) {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
|
|
case OR:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
if (x.Cmp(ethutil.BigInt0) >= 0) || (y.Cmp(ethutil.BigInt0) >= 0) {
|
|
stack.Push(ethutil.BigTrue)
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
case XOR:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
stack.Push(base.Xor(x, y))
|
|
case BYTE:
|
|
require(2)
|
|
val, th := stack.Popn()
|
|
if th.Cmp(big.NewInt(32)) < 0 {
|
|
stack.Push(big.NewInt(int64(len(val.Bytes())-1) - th.Int64()))
|
|
} else {
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
|
|
// 0x20 range
|
|
case SHA3:
|
|
require(2)
|
|
size, offset := stack.Popn()
|
|
data := ethutil.Sha3Bin(mem.Get(offset.Int64(), size.Int64()))
|
|
|
|
stack.Push(ethutil.BigD(data))
|
|
// 0x30 range
|
|
case ADDRESS:
|
|
stack.Push(ethutil.BigD(closure.Object().Address()))
|
|
case BALANCE:
|
|
stack.Push(closure.object.Amount)
|
|
case ORIGIN:
|
|
stack.Push(ethutil.BigD(vm.vars.Origin))
|
|
case CALLER:
|
|
stack.Push(ethutil.BigD(closure.Callee().Address()))
|
|
case CALLVALUE:
|
|
stack.Push(vm.vars.Value)
|
|
case CALLDATALOAD:
|
|
require(1)
|
|
offset := stack.Pop().Int64()
|
|
|
|
var data []byte
|
|
if len(closure.Args) >= int(offset+32) {
|
|
data = closure.Args[offset : offset+32]
|
|
} else {
|
|
data = []byte{0}
|
|
}
|
|
|
|
stack.Push(ethutil.BigD(data))
|
|
case CALLDATASIZE:
|
|
stack.Push(big.NewInt(int64(len(closure.Args))))
|
|
case GASPRICE:
|
|
stack.Push(closure.Price)
|
|
|
|
// 0x40 range
|
|
case PREVHASH:
|
|
stack.Push(ethutil.BigD(vm.vars.PrevHash))
|
|
case COINBASE:
|
|
stack.Push(ethutil.BigD(vm.vars.Coinbase))
|
|
case TIMESTAMP:
|
|
stack.Push(big.NewInt(vm.vars.Time))
|
|
case NUMBER:
|
|
stack.Push(big.NewInt(int64(vm.vars.BlockNumber)))
|
|
case DIFFICULTY:
|
|
stack.Push(vm.vars.Diff)
|
|
case GASLIMIT:
|
|
// TODO
|
|
stack.Push(big.NewInt(0))
|
|
|
|
// 0x50 range
|
|
case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
|
|
a := big.NewInt(int64(op) - int64(PUSH1) + 1)
|
|
pc.Add(pc, ethutil.Big1)
|
|
data := closure.Gets(pc, a)
|
|
val := ethutil.BigD(data.Bytes())
|
|
// Push value to stack
|
|
stack.Push(val)
|
|
pc.Add(pc, a.Sub(a, big.NewInt(1)))
|
|
|
|
step += int(op) - int(PUSH1) + 1
|
|
case POP:
|
|
require(1)
|
|
stack.Pop()
|
|
case DUP:
|
|
require(1)
|
|
stack.Push(stack.Peek())
|
|
case SWAP:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
stack.Push(y)
|
|
stack.Push(x)
|
|
case MLOAD:
|
|
require(1)
|
|
offset := stack.Pop()
|
|
stack.Push(ethutil.BigD(mem.Get(offset.Int64(), 32)))
|
|
case MSTORE: // Store the value at stack top-1 in to memory at location stack top
|
|
require(2)
|
|
// Pop value of the stack
|
|
val, mStart := stack.Popn()
|
|
mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(val, 256))
|
|
case MSTORE8:
|
|
require(2)
|
|
val, mStart := stack.Popn()
|
|
base.And(val, new(big.Int).SetInt64(0xff))
|
|
mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(base, 256))
|
|
case SLOAD:
|
|
require(1)
|
|
loc := stack.Pop()
|
|
val := closure.GetMem(loc)
|
|
//fmt.Println("get", val.BigInt(), "@", loc)
|
|
stack.Push(val.BigInt())
|
|
case SSTORE:
|
|
require(2)
|
|
val, loc := stack.Popn()
|
|
//fmt.Println("storing", val, "@", loc)
|
|
closure.SetStorage(loc, ethutil.NewValue(val))
|
|
|
|
// Add the change to manifest
|
|
vm.state.manifest.AddStorageChange(closure.Object(), loc.Bytes(), val)
|
|
case JUMP:
|
|
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)
|
|
continue
|
|
case JUMPI:
|
|
require(2)
|
|
cond, pos := stack.Popn()
|
|
if cond.Cmp(ethutil.BigTrue) == 0 {
|
|
pc = pos
|
|
//pc.Sub(pc, ethutil.Big1)
|
|
continue
|
|
}
|
|
case PC:
|
|
stack.Push(pc)
|
|
case MSIZE:
|
|
stack.Push(big.NewInt(int64(mem.Len())))
|
|
// 0x60 range
|
|
case CREATE:
|
|
require(3)
|
|
|
|
value := stack.Pop()
|
|
size, offset := stack.Popn()
|
|
|
|
// Snapshot the current stack so we are able to
|
|
// revert back to it later.
|
|
snapshot := vm.state.Snapshot()
|
|
|
|
// Generate a new address
|
|
addr := ethutil.CreateAddress(closure.callee.Address(), closure.callee.N())
|
|
// Create a new contract
|
|
contract := NewContract(addr, value, []byte(""))
|
|
// Set the init script
|
|
contract.initScript = mem.Get(offset.Int64(), size.Int64())
|
|
// Transfer all remaining gas to the new
|
|
// contract so it may run the init script
|
|
gas := new(big.Int).Set(closure.Gas)
|
|
closure.UseGas(gas)
|
|
|
|
// Create the closure
|
|
c := NewClosure(closure.callee,
|
|
closure.Object(),
|
|
contract.initScript,
|
|
vm.state,
|
|
gas,
|
|
closure.Price)
|
|
// Call the closure and set the return value as
|
|
// main script.
|
|
c.Script, gas, err = c.Call(vm, nil, hook)
|
|
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
|
|
// Revert the state as it was before.
|
|
vm.state.Revert(snapshot)
|
|
} else {
|
|
stack.Push(ethutil.BigD(addr))
|
|
|
|
vm.state.UpdateStateObject(contract)
|
|
}
|
|
case CALL:
|
|
require(7)
|
|
// Closure addr
|
|
addr := stack.Pop()
|
|
// Pop gas and value of the stack.
|
|
gas, value := stack.Popn()
|
|
// Pop input size and offset
|
|
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())
|
|
|
|
snapshot := vm.state.Snapshot()
|
|
|
|
// Fetch the contract which will serve as the closure body
|
|
contract := vm.state.GetStateObject(addr.Bytes())
|
|
|
|
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 {
|
|
// Copy
|
|
gas = new(big.Int).Set(closure.Gas)
|
|
}
|
|
closure.UseGas(gas)
|
|
|
|
// Add the value to the state object
|
|
contract.AddAmount(value)
|
|
|
|
// Create a new callable closure
|
|
closure := NewClosure(closure, contract, contract.script, vm.state, gas, closure.Price)
|
|
// Executer the closure and get the return value (if any)
|
|
ret, _, err := closure.Call(vm, args, hook)
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
// Reset the changes applied this object
|
|
vm.state.Revert(snapshot)
|
|
} else {
|
|
stack.Push(ethutil.BigTrue)
|
|
|
|
vm.state.UpdateStateObject(contract)
|
|
|
|
mem.Set(retOffset.Int64(), retSize.Int64(), ret)
|
|
}
|
|
} else {
|
|
ethutil.Config.Log.Debugf("Contract %x not found\n", addr.Bytes())
|
|
stack.Push(ethutil.BigFalse)
|
|
}
|
|
case RETURN:
|
|
require(2)
|
|
size, offset := stack.Popn()
|
|
ret := mem.Get(offset.Int64(), size.Int64())
|
|
|
|
return closure.Return(ret), nil
|
|
case SUICIDE:
|
|
require(1)
|
|
|
|
receiver := vm.state.GetAccount(stack.Pop().Bytes())
|
|
receiver.AddAmount(closure.object.Amount)
|
|
vm.state.UpdateStateObject(receiver)
|
|
|
|
closure.object.state.Purge()
|
|
|
|
fallthrough
|
|
case STOP: // Stop the closure
|
|
return closure.Return(nil), nil
|
|
default:
|
|
ethutil.Config.Log.Debugf("Invalid opcode %x\n", op)
|
|
|
|
return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
|
|
}
|
|
|
|
pc.Add(pc, ethutil.Big1)
|
|
|
|
if hook != nil {
|
|
if !hook(prevStep, op, mem, stack, closure.Object()) {
|
|
return nil, nil
|
|
}
|
|
}
|
|
}
|
|
}
|