зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
3.2 KiB
C++
129 строки
3.2 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is [Open Source Virtual Machine.].
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*
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* The Initial Developer of the Original Code is
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* Adobe System Incorporated.
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* Portions created by the Initial Developer are Copyright (C) 2004-2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Adobe AS3 Team
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __GCStack__
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#define __GCStack__
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namespace MMgc
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{
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template<typename T, int defSize=512>
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class GCStack
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{
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enum { kDefSize = defSize };
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public:
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GCStack(int defaultSize=kDefSize) : m_iCount(0), m_iAllocSize(defaultSize), m_items(NULL)
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{
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Alloc();
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}
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~GCStack()
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{
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if ( m_items )
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{
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delete [] m_items;
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m_items = NULL;
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}
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m_iCount = m_iAllocSize = 0;
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}
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void Push(T item)
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{
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if ( ( m_iCount + 1 ) > m_iAllocSize )
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{
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// need to allocate a new block first
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m_iAllocSize = m_iAllocSize ? m_iAllocSize*2 : kDefSize;
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Alloc();
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}
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m_items[m_iCount++] = item;
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}
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T Pop()
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{
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T t = m_items[--m_iCount];
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#ifdef _DEBUG
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GCAssert(m_iCount>=0);
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memset(&m_items[m_iCount], 0, sizeof(T));
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#endif
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return t;
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}
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T Peek()
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{
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#ifdef _DEBUG
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GCAssert(m_iCount>=0);
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#endif
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T t = m_items[m_iCount-1];
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return t;
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}
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unsigned int Count() { return m_iCount; }
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void Keep(unsigned int num)
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{
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GCAssert(num <= m_iCount);
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m_iCount = num;
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}
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T* GetData() { return m_items; }
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protected:
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// no impl
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GCStack(const GCStack& other);
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GCStack& operator=(const GCStack& other);
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private:
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void Alloc()
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{
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// need to allocate a new block first
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if(m_iAllocSize) {
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T* items = new T[ m_iAllocSize ];
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if ( items )
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{
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::memcpy(items, m_items, m_iCount * sizeof(T));
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}
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delete [] m_items;
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m_items = items;
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}
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}
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unsigned int m_iCount, m_iAllocSize;
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T *m_items;
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};
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}
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#endif /* __GCStack__ */
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