ethvm/common.go


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package ethvm

import (
    "math/big"

    "github.com/ethereum/eth-go/ethlog"
    "github.com/ethereum/eth-go/ethutil"
)

var vmlogger = ethlog.NewLogger("VM")

type Type int

const (
    StandardVmTy Type = iota
    DebugVmTy

    MaxVmTy
)

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)
    GasData    = big.NewInt(5)
    GasTx      = big.NewInt(500)

    Pow256 = ethutil.BigPow(2, 256)

    LogTyPretty byte = 0x1
    LogTyDiff   byte = 0x2

    To256 = ethutil.To256
)

const MaxCallDepth = 1024

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
}