721 lines
14 KiB
Go
721 lines
14 KiB
Go
package vm
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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// BIG FAT WARNING. THIS VM IS NOT YET IS USE!
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// I want to get all VM tests pass first before updating this VM
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type Vm struct {
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env Environment
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err error
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depth int
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}
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func New(env Environment, typ Type) VirtualMachine {
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switch typ {
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case DebugVmTy:
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return NewDebugVm(env)
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default:
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return &Vm{env: env}
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}
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}
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func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
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self.depth++
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// Recover from any require exception
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defer func() {
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if r := recover(); r != nil {
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ret = closure.Return(nil)
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err = fmt.Errorf("%v", r)
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}
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}()
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// Don't bother with the execution if there's no code.
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if len(closure.Code) == 0 {
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return closure.Return(nil), nil
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}
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var (
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op OpCode
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mem = &Memory{}
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stack = NewStack()
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pc = 0
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step = 0
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require = func(m int) {
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if stack.Len() < m {
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panic(fmt.Sprintf("%04v (%v) stack err size = %d, required = %d", pc, op, stack.Len(), m))
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}
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}
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)
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for {
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// The base for all big integer arithmetic
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base := new(big.Int)
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step++
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// Get the memory location of pc
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op := closure.GetOp(pc)
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gas := new(big.Int)
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addStepGasUsage := func(amount *big.Int) {
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gas.Add(gas, amount)
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}
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addStepGasUsage(GasStep)
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var newMemSize *big.Int = ethutil.Big0
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switch op {
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case STOP:
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gas.Set(ethutil.Big0)
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case SUICIDE:
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gas.Set(ethutil.Big0)
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case SLOAD:
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gas.Set(GasSLoad)
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case SSTORE:
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var mult *big.Int
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y, x := stack.Peekn()
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val := closure.GetStorage(x)
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if val.BigInt().Cmp(ethutil.Big0) == 0 && len(y.Bytes()) > 0 {
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mult = ethutil.Big2
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} else if val.BigInt().Cmp(ethutil.Big0) != 0 && len(y.Bytes()) == 0 {
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mult = ethutil.Big0
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} else {
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mult = ethutil.Big1
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}
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gas = new(big.Int).Mul(mult, GasSStore)
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case BALANCE:
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gas.Set(GasBalance)
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case MSTORE:
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require(2)
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newMemSize = calcMemSize(stack.Peek(), u256(32))
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case MLOAD:
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require(1)
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newMemSize = calcMemSize(stack.Peek(), u256(32))
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case MSTORE8:
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require(2)
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newMemSize = calcMemSize(stack.Peek(), u256(1))
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case RETURN:
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require(2)
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newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
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case SHA3:
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require(2)
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gas.Set(GasSha)
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newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
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case CALLDATACOPY:
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require(2)
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newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
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case CODECOPY:
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require(3)
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newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
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case EXTCODECOPY:
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require(4)
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newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-4])
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case CALL, CALLCODE:
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require(7)
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gas.Set(GasCall)
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addStepGasUsage(stack.data[stack.Len()-1])
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x := calcMemSize(stack.data[stack.Len()-6], stack.data[stack.Len()-7])
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y := calcMemSize(stack.data[stack.Len()-4], stack.data[stack.Len()-5])
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newMemSize = ethutil.BigMax(x, y)
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case CREATE:
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require(3)
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gas.Set(GasCreate)
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newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-3])
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}
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if newMemSize.Cmp(ethutil.Big0) > 0 {
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newMemSize.Add(newMemSize, u256(31))
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newMemSize.Div(newMemSize, u256(32))
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newMemSize.Mul(newMemSize, u256(32))
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if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
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memGasUsage := new(big.Int).Sub(newMemSize, u256(int64(mem.Len())))
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memGasUsage.Mul(GasMemory, memGasUsage)
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memGasUsage.Div(memGasUsage, u256(32))
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addStepGasUsage(memGasUsage)
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}
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}
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if !closure.UseGas(gas) {
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err := fmt.Errorf("Insufficient gas for %v. req %v has %v", op, gas, closure.Gas)
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closure.UseGas(closure.Gas)
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return closure.Return(nil), err
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}
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mem.Resize(newMemSize.Uint64())
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switch op {
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// 0x20 range
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case ADD:
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require(2)
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x, y := stack.Popn()
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base.Add(y, x)
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U256(base)
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// Pop result back on the stack
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stack.Push(base)
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case SUB:
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require(2)
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x, y := stack.Popn()
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base.Sub(y, x)
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U256(base)
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// Pop result back on the stack
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stack.Push(base)
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case MUL:
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require(2)
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x, y := stack.Popn()
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base.Mul(y, x)
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U256(base)
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// Pop result back on the stack
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stack.Push(base)
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case DIV:
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require(2)
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x, y := stack.Popn()
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if x.Cmp(ethutil.Big0) != 0 {
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base.Div(y, x)
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}
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U256(base)
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// Pop result back on the stack
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stack.Push(base)
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case SDIV:
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require(2)
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y, x := S256(stack.Pop()), S256(stack.Pop())
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if x.Cmp(ethutil.Big0) == 0 {
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base.Set(ethutil.Big0)
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} else {
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n := new(big.Int)
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if new(big.Int).Mul(y, x).Cmp(ethutil.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Div(y.Abs(y), x.Mul(x.Abs(x), n))
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U256(base)
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}
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stack.Push(base)
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case MOD:
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require(2)
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x, y := stack.Popn()
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base.Mod(y, x)
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U256(base)
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stack.Push(base)
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case SMOD:
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require(2)
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y, x := S256(stack.Pop()), S256(stack.Pop())
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if x.Cmp(ethutil.Big0) == 0 {
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base.Set(ethutil.Big0)
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} else {
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n := new(big.Int)
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if y.Cmp(ethutil.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Mod(y.Abs(y), x.Mul(x.Abs(x), n))
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U256(base)
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}
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stack.Push(base)
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case EXP:
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require(2)
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x, y := stack.Popn()
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base.Exp(y, x, Pow256)
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U256(base)
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stack.Push(base)
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case NOT:
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require(1)
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base.Sub(Pow256, stack.Pop())
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base = U256(base)
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stack.Push(base)
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case LT:
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require(2)
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x, y := stack.Popn()
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// x < y
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if y.Cmp(x) < 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case GT:
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require(2)
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x, y := stack.Popn()
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// x > y
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if y.Cmp(x) > 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case SLT:
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require(2)
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y, x := S256(stack.Pop()), S256(stack.Pop())
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// x < y
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if y.Cmp(S256(x)) < 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case SGT:
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require(2)
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y, x := S256(stack.Pop()), S256(stack.Pop())
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// x > y
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if y.Cmp(x) > 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case EQ:
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require(2)
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x, y := stack.Popn()
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// x == y
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if x.Cmp(y) == 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case ISZERO:
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require(1)
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x := stack.Pop()
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if x.Cmp(ethutil.BigFalse) > 0 {
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stack.Push(ethutil.BigFalse)
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} else {
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stack.Push(ethutil.BigTrue)
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}
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// 0x10 range
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case AND:
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require(2)
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x, y := stack.Popn()
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stack.Push(base.And(y, x))
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case OR:
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require(2)
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x, y := stack.Popn()
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stack.Push(base.Or(y, x))
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case XOR:
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require(2)
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x, y := stack.Popn()
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stack.Push(base.Xor(y, x))
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case BYTE:
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require(2)
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val, th := stack.Popn()
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if th.Cmp(big.NewInt(32)) < 0 && th.Cmp(big.NewInt(int64(len(val.Bytes())))) < 0 {
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byt := big.NewInt(int64(ethutil.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
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stack.Push(byt)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case ADDMOD:
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require(3)
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x := stack.Pop()
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y := stack.Pop()
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z := stack.Pop()
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base.Add(x, y)
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base.Mod(base, z)
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U256(base)
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stack.Push(base)
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case MULMOD:
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require(3)
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x := stack.Pop()
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y := stack.Pop()
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z := stack.Pop()
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base.Mul(x, y)
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base.Mod(base, z)
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U256(base)
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stack.Push(base)
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// 0x20 range
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case SHA3:
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require(2)
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size, offset := stack.Popn()
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data := crypto.Sha3(mem.Get(offset.Int64(), size.Int64()))
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stack.Push(ethutil.BigD(data))
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// 0x30 range
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case ADDRESS:
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stack.Push(ethutil.BigD(closure.Address()))
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case BALANCE:
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require(1)
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addr := stack.Pop().Bytes()
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balance := self.env.State().GetBalance(addr)
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stack.Push(balance)
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case ORIGIN:
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origin := self.env.Origin()
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stack.Push(ethutil.BigD(origin))
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case CALLER:
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caller := closure.caller.Address()
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stack.Push(ethutil.BigD(caller))
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case CALLVALUE:
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value := closure.exe.value
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stack.Push(value)
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case CALLDATALOAD:
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require(1)
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var (
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offset = stack.Pop()
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data = make([]byte, 32)
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lenData = big.NewInt(int64(len(closure.Args)))
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)
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if lenData.Cmp(offset) >= 0 {
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length := new(big.Int).Add(offset, ethutil.Big32)
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length = ethutil.BigMin(length, lenData)
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copy(data, closure.Args[offset.Int64():length.Int64()])
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}
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stack.Push(ethutil.BigD(data))
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case CALLDATASIZE:
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l := int64(len(closure.Args))
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stack.Push(big.NewInt(l))
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case CALLDATACOPY:
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var (
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size = int64(len(closure.Args))
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mOff = stack.Pop().Int64()
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cOff = stack.Pop().Int64()
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l = stack.Pop().Int64()
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)
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if cOff > size {
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cOff = 0
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l = 0
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} else if cOff+l > size {
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l = 0
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}
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code := closure.Args[cOff : cOff+l]
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mem.Set(mOff, l, code)
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case CODESIZE, EXTCODESIZE:
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var code []byte
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if op == EXTCODECOPY {
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addr := stack.Pop().Bytes()
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code = self.env.State().GetCode(addr)
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} else {
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code = closure.Code
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}
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l := big.NewInt(int64(len(code)))
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stack.Push(l)
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|
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case CODECOPY, EXTCODECOPY:
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var code []byte
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if op == EXTCODECOPY {
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addr := stack.Pop().Bytes()
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code = self.env.State().GetCode(addr)
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} else {
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code = closure.Code
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}
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var (
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size = int64(len(code))
|
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mOff = stack.Pop().Int64()
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cOff = stack.Pop().Int64()
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l = stack.Pop().Int64()
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)
|
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|
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if cOff > size {
|
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cOff = 0
|
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l = 0
|
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} else if cOff+l > size {
|
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l = 0
|
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}
|
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|
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codeCopy := code[cOff : cOff+l]
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|
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mem.Set(mOff, l, codeCopy)
|
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case GASPRICE:
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stack.Push(closure.Price)
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|
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// 0x40 range
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case PREVHASH:
|
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prevHash := self.env.PrevHash()
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|
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stack.Push(ethutil.BigD(prevHash))
|
|
|
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case COINBASE:
|
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coinbase := self.env.Coinbase()
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|
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stack.Push(ethutil.BigD(coinbase))
|
|
|
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case TIMESTAMP:
|
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time := self.env.Time()
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|
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stack.Push(big.NewInt(time))
|
|
|
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case NUMBER:
|
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number := self.env.BlockNumber()
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|
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stack.Push(number)
|
|
|
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case DIFFICULTY:
|
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difficulty := self.env.Difficulty()
|
|
|
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stack.Push(difficulty)
|
|
|
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case GASLIMIT:
|
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// TODO
|
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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 := int(op - PUSH1 + 1)
|
|
val := ethutil.BigD(closure.GetBytes(int(pc+1), a))
|
|
// Push value to stack
|
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stack.Push(val)
|
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|
|
pc += a
|
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|
|
step += int(op) - int(PUSH1) + 1
|
|
case POP:
|
|
require(1)
|
|
stack.Pop()
|
|
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
|
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n := int(op - DUP1 + 1)
|
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stack.Dupn(n)
|
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case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
|
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n := int(op - SWAP1 + 2)
|
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stack.Swapn(n)
|
|
|
|
case MLOAD:
|
|
require(1)
|
|
offset := stack.Pop()
|
|
val := ethutil.BigD(mem.Get(offset.Int64(), 32))
|
|
stack.Push(val)
|
|
|
|
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)
|
|
off := stack.Pop()
|
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val := stack.Pop()
|
|
|
|
mem.store[off.Int64()] = byte(val.Int64() & 0xff)
|
|
|
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case SLOAD:
|
|
require(1)
|
|
loc := stack.Pop()
|
|
val := closure.GetStorage(loc)
|
|
|
|
stack.Push(val.BigInt())
|
|
|
|
case SSTORE:
|
|
require(2)
|
|
val, loc := stack.Popn()
|
|
closure.SetStorage(loc, ethutil.NewValue(val))
|
|
|
|
closure.message.AddStorageChange(loc.Bytes())
|
|
|
|
case JUMP:
|
|
require(1)
|
|
pc = int(stack.Pop().Int64())
|
|
// Reduce pc by one because of the increment that's at the end of this for loop
|
|
|
|
continue
|
|
case JUMPI:
|
|
require(2)
|
|
cond, pos := stack.Popn()
|
|
if cond.Cmp(ethutil.BigTrue) >= 0 {
|
|
pc = int(pos.Int64())
|
|
|
|
if closure.GetOp(int(pc)) != JUMPDEST {
|
|
return closure.Return(nil), fmt.Errorf("JUMP missed JUMPDEST %v", pc)
|
|
}
|
|
|
|
continue
|
|
}
|
|
case JUMPDEST:
|
|
case PC:
|
|
stack.Push(u256(int64(pc)))
|
|
case MSIZE:
|
|
stack.Push(big.NewInt(int64(mem.Len())))
|
|
case GAS:
|
|
stack.Push(closure.Gas)
|
|
// 0x60 range
|
|
case CREATE:
|
|
require(3)
|
|
|
|
var (
|
|
err error
|
|
value = stack.Pop()
|
|
size, offset = stack.Popn()
|
|
input = mem.Get(offset.Int64(), size.Int64())
|
|
gas = new(big.Int).Set(closure.Gas)
|
|
|
|
// Snapshot the current stack so we are able to
|
|
// revert back to it later.
|
|
//snapshot = self.env.State().Copy()
|
|
)
|
|
|
|
// Generate a new address
|
|
addr := crypto.CreateAddress(closure.Address(), closure.object.Nonce)
|
|
closure.object.Nonce++
|
|
|
|
closure.UseGas(closure.Gas)
|
|
|
|
msg := NewExecution(self, addr, input, gas, closure.Price, value)
|
|
ret, err := msg.Exec(addr, closure)
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
|
|
// Revert the state as it was before.
|
|
//self.env.State().Set(snapshot)
|
|
|
|
} else {
|
|
msg.object.Code = ret
|
|
|
|
stack.Push(ethutil.BigD(addr))
|
|
}
|
|
|
|
case CALL, CALLCODE:
|
|
require(7)
|
|
|
|
gas := stack.Pop()
|
|
// Pop gas and value of the stack.
|
|
value, addr := stack.Popn()
|
|
// Pop input size and offset
|
|
inSize, inOffset := stack.Popn()
|
|
// Pop return size and offset
|
|
retSize, retOffset := stack.Popn()
|
|
|
|
// Get the arguments from the memory
|
|
args := mem.Get(inOffset.Int64(), inSize.Int64())
|
|
|
|
var executeAddr []byte
|
|
if op == CALLCODE {
|
|
executeAddr = closure.Address()
|
|
} else {
|
|
executeAddr = addr.Bytes()
|
|
}
|
|
|
|
msg := NewExecution(self, executeAddr, args, gas, closure.Price, value)
|
|
ret, err := msg.Exec(addr.Bytes(), closure)
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
} else {
|
|
stack.Push(ethutil.BigTrue)
|
|
|
|
mem.Set(retOffset.Int64(), retSize.Int64(), ret)
|
|
}
|
|
|
|
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 := self.env.State().GetOrNewStateObject(stack.Pop().Bytes())
|
|
|
|
receiver.AddAmount(closure.object.Balance())
|
|
|
|
closure.object.MarkForDeletion()
|
|
|
|
fallthrough
|
|
case STOP: // Stop the closure
|
|
|
|
return closure.Return(nil), nil
|
|
default:
|
|
vmlogger.Debugf("(pc) %-3v Invalid opcode %x\n", pc, op)
|
|
|
|
//panic(fmt.Sprintf("Invalid opcode %x", op))
|
|
|
|
return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
|
|
}
|
|
|
|
pc++
|
|
}
|
|
}
|
|
|
|
func (self *Vm) Env() Environment {
|
|
return self.env
|
|
}
|
|
|
|
func (self *Vm) Depth() int {
|
|
return self.depth
|
|
}
|
|
|
|
func (self *Vm) Printf(format string, v ...interface{}) VirtualMachine { return self }
|
|
func (self *Vm) Endl() VirtualMachine { return self }
|