mirror of https://github.com/status-im/op-geth.git
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// Copyright 2017 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// 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,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// 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/>.
|
|
|
|
package vm
|
|
|
|
import "math/big"
|
|
|
|
var checkVal = big.NewInt(-42)
|
|
|
|
const poolLimit = 256
|
|
|
|
// intPool is a pool of big integers that
|
|
// can be reused for all big.Int operations.
|
|
type intPool struct {
|
|
pool *Stack
|
|
}
|
|
|
|
func newIntPool() *intPool {
|
|
return &intPool{pool: newstack()}
|
|
}
|
|
|
|
func (p *intPool) get() *big.Int {
|
|
if p.pool.len() > 0 {
|
|
return p.pool.pop()
|
|
}
|
|
return new(big.Int)
|
|
}
|
|
func (p *intPool) put(is ...*big.Int) {
|
|
if len(p.pool.data) > poolLimit {
|
|
return
|
|
}
|
|
|
|
for _, i := range is {
|
|
// verifyPool is a build flag. Pool verification makes sure the integrity
|
|
// of the integer pool by comparing values to a default value.
|
|
if verifyPool {
|
|
i.Set(checkVal)
|
|
}
|
|
|
|
p.pool.push(i)
|
|
}
|
|
}
|