elexis
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/* Copyright (C) 2017 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.
|
|
*/
|
|
|
|
#include "precompiled.h"
|
|
#include "lib/allocators/unique_range.h"
|
|
|
|
#include "lib/bits.h" // is_pow2, round_up
|
|
#include "lib/sysdep/cpu.h" // cpu_AtomicAdd
|
|
#include "lib/sysdep/rtl.h" // rtl_FreeAligned
|
|
|
|
|
|
static void FreeNone(void* UNUSED(pointer), size_t UNUSED(size))
|
|
{
|
|
// (providing a deleter function for idxDeleterNone avoids
|
|
// having to check whether deleters[idxDeleter] == 0)
|
|
}
|
|
|
|
static void FreeAligned(void* pointer, size_t UNUSED(size))
|
|
{
|
|
return rtl_FreeAligned(pointer);
|
|
}
|
|
|
|
|
|
static UniqueRangeDeleter deleters[allocationAlignment] = { FreeNone, FreeAligned };
|
|
|
|
static IdxDeleter numDeleters = 2;
|
|
|
|
|
|
// NB: callers should skip this if *idxDeleterOut != 0 (avoids the overhead
|
|
// of an unnecessary indirect function call)
|
|
void RegisterUniqueRangeDeleter(UniqueRangeDeleter deleter, volatile IdxDeleter* idxDeleterOut)
|
|
{
|
|
ENSURE(deleter);
|
|
|
|
if(!cpu_CAS(idxDeleterOut, idxDeleterNone, -1)) // not the first call for this deleter
|
|
{
|
|
// wait until an index has been assigned
|
|
while(*idxDeleterOut <= 0)
|
|
cpu_Pause();
|
|
return;
|
|
}
|
|
|
|
const IdxDeleter idxDeleter = cpu_AtomicAdd(&numDeleters, 1);
|
|
ENSURE(idxDeleter < (IdxDeleter)ARRAY_SIZE(deleters));
|
|
deleters[idxDeleter] = deleter;
|
|
COMPILER_FENCE;
|
|
*idxDeleterOut = idxDeleter;
|
|
}
|
|
|
|
|
|
NOTHROW_DEFINE void CallUniqueRangeDeleter(void* pointer, size_t size, IdxDeleter idxDeleter)
|
|
{
|
|
ASSERT(idxDeleter < numDeleters);
|
|
// (some deleters do not tolerate null pointers)
|
|
if(pointer)
|
|
deleters[idxDeleter](pointer, size);
|
|
}
|
|
|
|
|
|
UniqueRange AllocateAligned(size_t size, size_t alignment)
|
|
{
|
|
ENSURE(is_pow2(alignment));
|
|
alignment = std::max(alignment, allocationAlignment);
|
|
|
|
const size_t alignedSize = round_up(size, alignment);
|
|
const UniqueRange::pointer p = rtl_AllocateAligned(alignedSize, alignment);
|
|
|
|
static volatile IdxDeleter idxDeleterAligned;
|
|
if(idxDeleterAligned == 0) // (optional optimization)
|
|
RegisterUniqueRangeDeleter(FreeAligned, &idxDeleterAligned);
|
|
|
|
return UniqueRange(p, size, idxDeleterAligned);
|
|
}
|
|
|
|
|
|
UniqueRange AllocateVM(size_t size, vm::PageType pageType, int prot)
|
|
{
|
|
const UniqueRange::pointer p = vm::Allocate(size, pageType, prot);
|
|
|
|
static volatile IdxDeleter idxDeleter;
|
|
if(idxDeleter == 0) // (optional optimization)
|
|
RegisterUniqueRangeDeleter(vm::Free, &idxDeleter);
|
|
|
|
return UniqueRange(p, size, idxDeleter);
|
|
}
|