68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
|
|
// Copyright Oliver Kowalke 2009.
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H
|
|
#define BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H
|
|
|
|
#include <cstddef>
|
|
#include <cstdlib>
|
|
#include <stdexcept>
|
|
|
|
#include <boost/assert.hpp>
|
|
#include <boost/config.hpp>
|
|
|
|
#include <boost/context/detail/config.hpp>
|
|
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_PREFIX
|
|
#endif
|
|
|
|
namespace boost {
|
|
namespace context {
|
|
|
|
template< std::size_t Max, std::size_t Default, std::size_t Min >
|
|
class simple_stack_allocator
|
|
{
|
|
public:
|
|
static std::size_t maximum_stacksize()
|
|
{ return Max; }
|
|
|
|
static std::size_t default_stacksize()
|
|
{ return Default; }
|
|
|
|
static std::size_t minimum_stacksize()
|
|
{ return Min; }
|
|
|
|
void * allocate( std::size_t size) const
|
|
{
|
|
BOOST_ASSERT( minimum_stacksize() <= size);
|
|
BOOST_ASSERT( maximum_stacksize() >= size);
|
|
|
|
void * limit = std::calloc( size, sizeof( char) );
|
|
if ( ! limit) throw std::bad_alloc();
|
|
|
|
return static_cast< char * >( limit) + size;
|
|
}
|
|
|
|
void deallocate( void * vp, std::size_t size) const
|
|
{
|
|
BOOST_ASSERT( vp);
|
|
BOOST_ASSERT( minimum_stacksize() <= size);
|
|
BOOST_ASSERT( maximum_stacksize() >= size);
|
|
|
|
void * limit = static_cast< char * >( vp) - size;
|
|
std::free( limit);
|
|
}
|
|
};
|
|
|
|
}}
|
|
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_SUFFIX
|
|
#endif
|
|
|
|
#endif // BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H
|