mirror of
https://github.com/yse/easy_profiler.git
synced 2024-12-27 00:31:02 +08:00
140 lines
4.4 KiB
C++
140 lines
4.4 KiB
C++
/**
|
|
Lightweight profiler library for c++
|
|
Copyright(C) 2016-2017 Sergey Yagovtsev, Victor Zarubkin
|
|
|
|
Licensed under either of
|
|
* MIT license (LICENSE.MIT or http://opensource.org/licenses/MIT)
|
|
* Apache License, Version 2.0, (LICENSE.APACHE or http://www.apache.org/licenses/LICENSE-2.0)
|
|
at your option.
|
|
|
|
The MIT License
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished
|
|
to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
|
|
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
|
|
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
|
|
The Apache License, Version 2.0 (the "License");
|
|
You may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
|
|
**/
|
|
|
|
#ifndef EASY_PROFILER_STACK_BUFFER_H
|
|
#define EASY_PROFILER_STACK_BUFFER_H
|
|
|
|
#include "nonscoped_block.h"
|
|
#include <list>
|
|
#include <algorithm>
|
|
|
|
#ifdef max
|
|
#undef max
|
|
#endif
|
|
|
|
template <class T>
|
|
inline void destroy_elem(T*)
|
|
{
|
|
|
|
}
|
|
|
|
inline void destroy_elem(NonscopedBlock* _elem)
|
|
{
|
|
_elem->destroy();
|
|
}
|
|
|
|
template <class T>
|
|
class StackBuffer
|
|
{
|
|
struct chunk { int8_t data[sizeof(T)]; };
|
|
|
|
std::list<chunk> m_overflow; ///< List of additional stack elements if current capacity of buffer is not enough
|
|
T* m_buffer; ///< Contiguous buffer used for stack
|
|
uint32_t m_size; ///< Current size of stack
|
|
uint32_t m_capacity; ///< Current capacity of m_buffer
|
|
uint32_t m_maxcapacity; ///< Maximum used capacity including m_buffer and m_overflow
|
|
|
|
public:
|
|
|
|
StackBuffer() = delete;
|
|
StackBuffer(const StackBuffer&) = delete;
|
|
StackBuffer(StackBuffer&&) = delete;
|
|
|
|
explicit StackBuffer(uint32_t N)
|
|
: m_buffer(static_cast<T*>(malloc(N * sizeof(T))))
|
|
, m_size(0)
|
|
, m_capacity(N)
|
|
, m_maxcapacity(N)
|
|
{
|
|
}
|
|
|
|
~StackBuffer()
|
|
{
|
|
for (uint32_t i = 0; i < m_size; ++i)
|
|
destroy_elem(m_buffer + i);
|
|
|
|
free(m_buffer);
|
|
|
|
for (auto& elem : m_overflow)
|
|
destroy_elem(reinterpret_cast<T*>(elem.data + 0));
|
|
}
|
|
|
|
template <class ... TArgs>
|
|
T& push(TArgs ... _args)
|
|
{
|
|
if (m_size < m_capacity)
|
|
return *(::new (m_buffer + m_size++) T(_args...));
|
|
|
|
m_overflow.emplace_back();
|
|
const uint32_t cap = m_capacity + static_cast<uint32_t>(m_overflow.size());
|
|
if (m_maxcapacity < cap)
|
|
m_maxcapacity = cap;
|
|
|
|
return *(::new (m_overflow.back().data + 0) T(_args...));
|
|
}
|
|
|
|
void pop()
|
|
{
|
|
if (m_overflow.empty())
|
|
{
|
|
// m_size should not be equal to 0 here because ProfileManager behavior does not allow such situation
|
|
destroy_elem(m_buffer + --m_size);
|
|
|
|
if (m_size == 0 && m_maxcapacity > m_capacity)
|
|
{
|
|
// When stack gone empty we can resize buffer to use enough space in the future
|
|
free(m_buffer);
|
|
m_maxcapacity = m_capacity = std::max(m_maxcapacity, m_capacity << 1);
|
|
m_buffer = static_cast<T*>(malloc(m_capacity * sizeof(T)));
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
destroy_elem(reinterpret_cast<T*>(m_overflow.back().data + 0));
|
|
m_overflow.pop_back();
|
|
}
|
|
|
|
}; // END of class StackBuffer.
|
|
|
|
#endif // EASY_PROFILER_STACK_BUFFER_H
|