mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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c293883ec0
after removal of tevm experiment - we left interfaces everywhere removing it for performance and for geth compatibility
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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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
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// 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
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package stack
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import (
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"fmt"
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"sync"
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"github.com/holiman/uint256"
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"github.com/ledgerwatch/log/v3"
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)
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var stackPool = sync.Pool{
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New: func() interface{} {
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return &Stack{Data: make([]uint256.Int, 0, 16)}
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},
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}
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// Stack is an object for basic stack operations. Items popped to the stack are
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// expected to be changed and modified. stack does not take care of adding newly
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// initialised objects.
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type Stack struct {
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Data []uint256.Int
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}
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func New() *Stack {
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stack, ok := stackPool.Get().(*Stack)
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if !ok {
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log.Error("Type assertion failure", "err", "cannot get Stack pointer from stackPool")
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}
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return stack
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}
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func (st *Stack) Push(d *uint256.Int) {
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// NOTE push limit (1024) is checked in baseCheck
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st.Data = append(st.Data, *d)
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}
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func (st *Stack) PushN(ds ...uint256.Int) {
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// FIXME: Is there a way to pass args by pointers.
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st.Data = append(st.Data, ds...)
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}
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func (st *Stack) Pop() (ret uint256.Int) {
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ret = st.Data[len(st.Data)-1]
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st.Data = st.Data[:len(st.Data)-1]
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return
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}
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func (st *Stack) Cap() int {
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return cap(st.Data)
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}
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func (st *Stack) Swap(n int) {
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st.Data[len(st.Data)-n], st.Data[len(st.Data)-1] = st.Data[len(st.Data)-1], st.Data[len(st.Data)-n]
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}
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func (st *Stack) Dup(n int) {
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st.Data = append(st.Data, st.Data[len(st.Data)-n])
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}
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func (st *Stack) Peek() *uint256.Int {
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return &st.Data[len(st.Data)-1]
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}
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// Back returns the n'th item in stack
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func (st *Stack) Back(n int) *uint256.Int {
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return &st.Data[len(st.Data)-n-1]
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}
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func (st *Stack) Reset() {
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st.Data = st.Data[:0]
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}
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func (st *Stack) Len() int {
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return len(st.Data)
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}
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// Print dumps the content of the stack
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func (st *Stack) Print() {
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fmt.Println("### stack ###")
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if len(st.Data) > 0 {
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for i, val := range st.Data {
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fmt.Printf("%-3d %v\n", i, val)
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}
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} else {
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fmt.Println("-- empty --")
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}
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fmt.Println("#############")
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}
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func ReturnNormalStack(s *Stack) {
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s.Data = s.Data[:0]
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stackPool.Put(s)
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}
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