vm/common.go


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package vm

import (
    "math/big"

    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/logger"
)

var vmlogger = logger.NewLogger("VM")

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 (
    GasStep         = big.NewInt(1)
    GasSha          = big.NewInt(10)
    GasSLoad        = big.NewInt(20)
    GasSStore       = big.NewInt(100)
    GasSStoreRefund = big.NewInt(100)
    GasBalance      = big.NewInt(20)
    GasCreate       = big.NewInt(100)
    GasCall         = big.NewInt(20)
    GasCreateByte   = big.NewInt(5)
    GasSha3Byte     = big.NewInt(10)
    GasSha256Byte   = big.NewInt(50)
    GasRipemdByte   = big.NewInt(50)
    GasMemory       = big.NewInt(1)
    GasData         = big.NewInt(5)
    GasTx           = big.NewInt(500)
    GasLog          = big.NewInt(32)
    GasSha256       = big.NewInt(50)
    GasRipemd       = big.NewInt(50)
    GasEcrecover    = big.NewInt(500)
    GasMemCpy       = big.NewInt(1)

    Pow256 = ethutil.BigPow(2, 256)

    LogTyPretty byte = 0x1
    LogTyDiff   byte = 0x2

    U256 = ethutil.U256
    S256 = ethutil.S256
)

const MaxCallDepth = 1025

func calcMemSize(off, l *big.Int) *big.Int {
    if l.Cmp(ethutil.Big0) == 0 {
        return ethutil.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
}