mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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namespace ams::fs {
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namespace {
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constinit bool g_used_default_allocator = false;
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void *DefaultAllocate(size_t size) {
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g_used_default_allocator = true;
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return ams::Malloc(size);
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}
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void DefaultDeallocate(void *ptr, size_t size) {
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AMS_UNUSED(size);
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ams::Free(ptr);
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}
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constinit os::SdkMutex g_mutex;
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constinit AllocateFunction g_allocate_func = DefaultAllocate;
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constinit DeallocateFunction g_deallocate_func = DefaultDeallocate;
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constexpr size_t RequiredAlignment = alignof(u64);
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Result SetAllocatorImpl(AllocateFunction allocator, DeallocateFunction deallocator) {
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/* Ensure SetAllocator is used correctly. */
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R_UNLESS(g_allocate_func == DefaultAllocate, fs::ResultAllocatorAlreadyRegistered());
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R_UNLESS(g_deallocate_func == DefaultDeallocate, fs::ResultAllocatorAlreadyRegistered());
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R_UNLESS(allocator != nullptr, fs::ResultNullptrArgument());
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R_UNLESS(deallocator != nullptr, fs::ResultNullptrArgument());
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R_UNLESS(!g_used_default_allocator, fs::ResultDefaultAllocatorUsed());
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/* Set allocators. */
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g_allocate_func = allocator;
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g_deallocate_func = deallocator;
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return ResultSuccess();
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}
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}
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void SetAllocator(AllocateFunction allocator, DeallocateFunction deallocator) {
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R_ABORT_UNLESS(SetAllocatorImpl(allocator, deallocator));
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}
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namespace impl {
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void LockAllocatorMutex() {
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g_mutex.Lock();
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}
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void UnlockAllocatorMutex() {
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g_mutex.Unlock();
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}
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void *AllocateUnsafe(size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(g_mutex.IsLockedByCurrentThread());
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/* Allocate. */
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void * const ptr = g_allocate_func(size);
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/* Check alignment. */
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if (AMS_UNLIKELY(!util::IsAligned(reinterpret_cast<uintptr_t>(ptr), RequiredAlignment))) {
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R_ABORT_UNLESS(fs::ResultAllocatorAlignmentViolation());
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}
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/* Return allocated pointer. */
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return ptr;
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}
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void DeallocateUnsafe(void *ptr, size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(g_mutex.IsLockedByCurrentThread());
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/* Deallocate the pointer. */
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g_deallocate_func(ptr, size);
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}
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void *Allocate(size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(g_allocate_func != nullptr);
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/* Lock the allocator. */
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std::scoped_lock lk(g_mutex);
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return AllocateUnsafe(size);
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}
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void Deallocate(void *ptr, size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(g_deallocate_func != nullptr);
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/* If the pointer is non-null, deallocate it. */
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if (ptr != nullptr) {
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/* Lock the allocator. */
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std::scoped_lock lk(g_mutex);
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DeallocateUnsafe(ptr, size);
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}
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}
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}
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} |