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/* Copyright (C) 2021 Wildfire Games.
*
* 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.
*/
#ifndef INCLUDED_STATELESS_ALLOCATORS
#define INCLUDED_STATELESS_ALLOCATORS
#include "lib/sysdep/rtl.h"
#include "lib/sysdep/vm.h"
#include <memory>
// NB: STL allocators are parameterized on the object type and indicate
// the number of elements to [de]allocate. however, these adapters are
// only used for allocating storage and receive the number of bytes.
struct Allocator_Heap
{
void* allocate(size_t size)
{
return malloc(size);
}
void deallocate(void* p, size_t UNUSED(size))
{
return free(p);
}
};
template<size_t alignment = allocationAlignment>
struct Allocator_Aligned
{
void* allocate(size_t size)
{
return rtl_AllocateAligned(size, alignment);
}
void deallocate(void* p, size_t UNUSED(size))
{
return rtl_FreeAligned(p);
}
};
template<vm::PageType pageType = vm::kDefault, int prot = PROT_READ|PROT_WRITE>
struct Allocator_VM
{
void* allocate(size_t size)
{
return vm::Allocate(size, pageType, prot);
}
void deallocate(void* p, size_t size)
{
vm::Free(p, size);
}
};
template<size_t commitSize = g_LargePageSize, vm::PageType pageType = vm::kDefault, int prot = PROT_READ|PROT_WRITE>
struct Allocator_AddressSpace
{
void* allocate(size_t size)
{
return vm::ReserveAddressSpace(size, commitSize, pageType, prot);
}
void deallocate(void* p, size_t size)
{
vm::ReleaseAddressSpace(p, size);
}
};
#endif // INCLUDED_STATELESS_ALLOCATORS
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