90 lines
1.6 KiB
Go
90 lines
1.6 KiB
Go
package vm
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import (
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"math"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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// Global Debug flag indicating Debug VM (full logging)
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var Debug bool
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type Type byte
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const (
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StdVmTy Type = iota
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JitVmTy
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MaxVmTy
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LogTyPretty byte = 0x1
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LogTyDiff byte = 0x2
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)
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var (
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Pow256 = common.BigPow(2, 256)
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U256 = common.U256
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S256 = common.S256
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Zero = common.Big0
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One = common.Big1
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max = big.NewInt(math.MaxInt64)
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)
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func NewVm(env Environment) VirtualMachine {
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switch env.VmType() {
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case JitVmTy:
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return NewJitVm(env)
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default:
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glog.V(0).Infoln("unsupported vm type %d", env.VmType())
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fallthrough
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case StdVmTy:
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return New(env)
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}
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}
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func calcMemSize(off, l *big.Int) *big.Int {
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if l.Cmp(common.Big0) == 0 {
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return common.Big0
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}
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return new(big.Int).Add(off, l)
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}
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// Simple helper
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func u256(n int64) *big.Int {
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return big.NewInt(n)
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}
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// Mainly used for print variables and passing to Print*
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func toValue(val *big.Int) interface{} {
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// Let's assume a string on right padded zero's
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b := val.Bytes()
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if b[0] != 0 && b[len(b)-1] == 0x0 && b[len(b)-2] == 0x0 {
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return string(b)
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}
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return val
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}
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func getData(data []byte, start, size *big.Int) []byte {
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dlen := big.NewInt(int64(len(data)))
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s := common.BigMin(start, dlen)
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e := common.BigMin(new(big.Int).Add(s, size), dlen)
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return common.RightPadBytes(data[s.Uint64():e.Uint64()], int(size.Uint64()))
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}
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func UseGas(gas, amount *big.Int) bool {
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if gas.Cmp(amount) < 0 {
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return false
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}
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// Sub the amount of gas from the remaining
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gas.Sub(gas, amount)
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return true
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}
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