167 lines
3.5 KiB
C++
167 lines
3.5 KiB
C++
/*
|
|
* Licensed under 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.
|
|
*
|
|
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#include "linear.hpp"
|
|
|
|
#include "../../pointer.hpp"
|
|
#include "../../debug.hpp"
|
|
|
|
using util::alloc::raw::linear;
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
linear::linear (util::view<std::byte*> _data):
|
|
m_begin (_data.begin ()),
|
|
m_end (_data.end ()),
|
|
m_cursor (_data.begin ())
|
|
{ ; }
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
void*
|
|
linear::allocate (size_t bytes)
|
|
{
|
|
if (m_cursor + bytes > m_end)
|
|
throw std::bad_alloc ();
|
|
|
|
auto ptr = m_cursor;
|
|
m_cursor += bytes;
|
|
return ptr;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
void*
|
|
linear::allocate (size_t bytes, size_t alignment)
|
|
{
|
|
auto ptr = align (m_cursor, alignment);
|
|
if (ptr + bytes > m_end)
|
|
throw std::bad_alloc ();
|
|
|
|
m_cursor = ptr + bytes;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
void
|
|
linear::deallocate (void *ptr, size_t bytes)
|
|
{
|
|
deallocate (ptr, bytes, alignof (std::max_align_t));
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
void
|
|
linear::deallocate (void *ptr, size_t bytes, size_t alignment)
|
|
{
|
|
(void)ptr;
|
|
(void)bytes;
|
|
(void)alignment;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
std::byte*
|
|
linear::data (void)
|
|
{
|
|
return m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
const std::byte*
|
|
linear::data (void) const
|
|
{
|
|
return m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
std::byte*
|
|
linear::begin (void)
|
|
{
|
|
return m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
const std::byte*
|
|
linear::begin (void) const
|
|
{
|
|
return m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
std::byte*
|
|
linear::end (void)
|
|
{
|
|
return m_end;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
const std::byte*
|
|
linear::end (void) const
|
|
{
|
|
return m_end;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
size_t
|
|
linear::offset (const void *_ptr) const
|
|
{
|
|
auto ptr = reinterpret_cast<const std::byte*> (_ptr);
|
|
|
|
CHECK_GE (ptr, m_begin);
|
|
return ptr - m_begin;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
void
|
|
linear::reset (void)
|
|
{
|
|
m_cursor = m_begin;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
size_t
|
|
linear::capacity (void) const
|
|
{
|
|
return m_end - m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
size_t
|
|
linear::used (void) const
|
|
{
|
|
return m_cursor - m_begin;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
size_t
|
|
linear::remain (void) const
|
|
{
|
|
return capacity () - used ();
|
|
}
|