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|
package vm
import (
"math"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/logger"
)
var vmlogger = logger.NewLogger("VM")
// Global Debug flag indicating Debug VM (full logging)
var Debug bool
type Type byte
const (
StdVmTy Type = iota
JitVmTy
MaxVmTy
)
func NewVm(env Environment) VirtualMachine {
switch env.VmType() {
case JitVmTy:
return NewJitVm(env)
default:
vmlogger.Infoln("unsupported vm type %d", env.VmType())
fallthrough
case StdVmTy:
return New(env)
}
}
var (
GasQuickStep = big.NewInt(2)
GasFastestStep = big.NewInt(3)
GasFastStep = big.NewInt(5)
GasMidStep = big.NewInt(8)
GasSlowStep = big.NewInt(10)
GasExtStep = big.NewInt(20)
GasStorageGet = big.NewInt(50)
GasStorageAdd = big.NewInt(20000)
GasStorageMod = big.NewInt(5000)
GasLogBase = big.NewInt(375)
GasLogTopic = big.NewInt(375)
GasLogByte = big.NewInt(8)
GasCreate = big.NewInt(32000)
GasCreateByte = big.NewInt(200)
GasCall = big.NewInt(40)
GasCallValueTransfer = big.NewInt(9000)
GasStipend = big.NewInt(2300)
GasCallNewAccount = big.NewInt(25000)
GasReturn = big.NewInt(0)
GasStop = big.NewInt(0)
GasJumpDest = big.NewInt(1)
RefundStorage = big.NewInt(15000)
RefundSuicide = big.NewInt(24000)
GasMemWord = big.NewInt(3)
GasQuadCoeffDenom = big.NewInt(512)
GasContractByte = big.NewInt(200)
GasTransaction = big.NewInt(21000)
GasTxDataNonzeroByte = big.NewInt(68)
GasTxDataZeroByte = big.NewInt(4)
GasTx = big.NewInt(21000)
GasExp = big.NewInt(10)
GasExpByte = big.NewInt(10)
GasSha3Base = big.NewInt(30)
GasSha3Word = big.NewInt(6)
GasSha256Base = big.NewInt(60)
GasSha256Word = big.NewInt(12)
GasRipemdBase = big.NewInt(600)
GasRipemdWord = big.NewInt(12)
GasEcrecover = big.NewInt(3000)
GasIdentityBase = big.NewInt(15)
GasIdentityWord = big.NewInt(3)
GasCopyWord = big.NewInt(3)
Pow256 = common.BigPow(2, 256)
LogTyPretty byte = 0x1
LogTyDiff byte = 0x2
U256 = common.U256
S256 = common.S256
Zero = common.Big0
)
const MaxCallDepth = 1025
func calcMemSize(off, l *big.Int) *big.Int {
if l.Cmp(common.Big0) == 0 {
return common.Big0
}
return new(big.Int).Add(off, l)
}
// Simple helper
func u256(n int64) *big.Int {
return big.NewInt(n)
}
// Mainly used for print variables and passing to Print*
func toValue(val *big.Int) interface{} {
// Let's assume a string on right padded zero's
b := val.Bytes()
if b[0] != 0 && b[len(b)-1] == 0x0 && b[len(b)-2] == 0x0 {
return string(b)
}
return val
}
func getCode(code []byte, start, size uint64) []byte {
x := uint64(math.Min(float64(start), float64(len(code))))
y := uint64(math.Min(float64(x+size), float64(len(code))))
return common.RightPadBytes(code[x:y], int(size))
}
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