plugeth/core/vm/common.go

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
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//
// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
import (
"math"
"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger/glog"
)
// Global Debug flag indicating Debug VM (full logging)
var Debug bool
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type Type byte
const (
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StdVmTy Type = iota
JitVmTy
MaxVmTy
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LogTyPretty byte = 0x1
LogTyDiff byte = 0x2
)
var (
Pow256 = common.BigPow(2, 256)
U256 = common.U256
S256 = common.S256
Zero = common.Big0
One = common.Big1
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max = big.NewInt(math.MaxInt64)
)
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func NewVm(env Environment) VirtualMachine {
switch env.VmType() {
case JitVmTy:
return NewJitVm(env)
default:
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glog.V(0).Infoln("unsupported vm type %d", env.VmType())
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fallthrough
case StdVmTy:
return New(env)
}
}
func calcMemSize(off, l *big.Int) *big.Int {
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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
}
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func getData(data []byte, start, size *big.Int) []byte {
dlen := big.NewInt(int64(len(data)))
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s := common.BigMin(start, dlen)
e := common.BigMin(new(big.Int).Add(s, size), dlen)
return common.RightPadBytes(data[s.Uint64():e.Uint64()], int(size.Uint64()))
}
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func UseGas(gas, amount *big.Int) bool {
if gas.Cmp(amount) < 0 {
return false
}
// Sub the amount of gas from the remaining
gas.Sub(gas, amount)
return true
}