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stack.go
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stack.go
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// Copyright 2014 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 evm
import (
"sync"
"github.com/holiman/uint256"
)
// 使用sync.Pool(对象池)提高性能
var stackPool = sync.Pool{
New: func() any {
return &Stack{
data: make([]uint256.Int, 0, 16),
}
},
}
func newstack() *Stack {
return stackPool.Get().(*Stack)
}
func returnStack(s *Stack) {
s.data = s.data[:0]
stackPool.Put(s)
}
// stack本身只是个FILO模型的Slice
type Stack struct {
data []uint256.Int
}
func (s *Stack) Data() []uint256.Int {
return s.data
}
// 添加数据到Stack顶部
func (s *Stack) push(d *uint256.Int) {
s.data = append(s.data, *d)
}
// 取出Stack顶部的数据
func (s *Stack) pop() (ret uint256.Int) {
// 取Slice最后一个值做返回值
ret = s.data[len(s.data)-1]
// 并移除
s.data = s.data[:len(s.data)-1]
return
}
func (s *Stack) len() int {
return len(s.data)
}
// 交换指定位置和Stack顶部的值
func (s *Stack) swap(n int) {
s.data[s.len()-n], s.data[s.len()-1] = s.data[s.len()-1], s.data[s.len()-n]
}
// 复制Stack指定位置的数据到顶部
func (s *Stack) dup(n int) {
s.push(&s.data[s.len()-n])
}
// 返回但不删除Stack顶部的值
func (s *Stack) peek() *uint256.Int {
return &s.data[s.len()-1]
}
// 返回但不删除指定位置的值
func (s *Stack) Back(n int) *uint256.Int {
return &s.data[s.len()-n-1]
}