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// Copyright 2025 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/MemArena.h"
#include "Common/Assert.h"
#include "Common/Logging/Log.h"
namespace Common
{
MemArena::MemArena() = default;
MemArena::~MemArena() = default;
void MemArena::GrabSHMSegment(size_t size, std::string_view base_name)
{
kern_return_t retval = vm_allocate(mach_task_self(), &m_shm_address, size, VM_FLAGS_ANYWHERE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "GrabSHMSegment failed: vm_allocate returned {0:#x}", retval);
m_shm_address = 0;
return;
}
memory_object_size_t entry_size = size;
constexpr vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
retval = mach_make_memory_entry_64(mach_task_self(), &entry_size, m_shm_address, prot,
&m_shm_entry, MACH_PORT_NULL);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "GrabSHMSegment failed: mach_make_memory_entry_64 returned {0:#x}",
retval);
m_shm_address = 0;
m_shm_entry = MACH_PORT_NULL;
return;
}
m_shm_size = size;
}
void MemArena::ReleaseSHMSegment()
{
if (m_shm_entry != MACH_PORT_NULL)
{
mach_port_deallocate(mach_task_self(), m_shm_entry);
}
if (m_shm_address != 0)
{
vm_deallocate(mach_task_self(), m_shm_address, m_shm_size);
}
m_shm_address = 0;
m_shm_size = 0;
m_shm_entry = MACH_PORT_NULL;
}
void* MemArena::CreateView(s64 offset, size_t size)
{
if (m_shm_address == 0)
{
ERROR_LOG_FMT(MEMMAP, "CreateView failed: no shared memory segment allocated");
return nullptr;
}
vm_address_t address = 0;
constexpr vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
kern_return_t retval = vm_map(mach_task_self(), &address, size, 0, VM_FLAGS_ANYWHERE, m_shm_entry,
offset, false, prot, prot, VM_INHERIT_DEFAULT);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "CreateView failed: vm_map returned {0:#x}", retval);
return nullptr;
}
return reinterpret_cast<void*>(address);
}
void MemArena::ReleaseView(void* view, size_t size)
{
vm_deallocate(mach_task_self(), reinterpret_cast<vm_address_t>(view), size);
}
u8* MemArena::ReserveMemoryRegion(size_t memory_size)
{
vm_address_t address = 0;
kern_return_t retval = vm_allocate(mach_task_self(), &address, memory_size, VM_FLAGS_ANYWHERE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "ReserveMemoryRegion: vm_allocate returned {0:#x}", retval);
return nullptr;
}
retval = vm_protect(mach_task_self(), address, memory_size, true, VM_PROT_NONE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "ReserveMemoryRegion failed: vm_prot returned {0:#x}", retval);
return nullptr;
}
m_region_address = address;
m_region_size = memory_size;
return reinterpret_cast<u8*>(m_region_address);
}
void MemArena::ReleaseMemoryRegion()
{
if (m_region_address != 0)
{
vm_deallocate(mach_task_self(), m_region_address, m_region_size);
}
m_region_address = 0;
m_region_size = 0;
}
void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
{
if (m_shm_address == 0)
{
ERROR_LOG_FMT(MEMMAP, "MapInMemoryRegion failed: no shared memory segment allocated");
return nullptr;
}
vm_address_t address = reinterpret_cast<vm_address_t>(base);
constexpr vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
kern_return_t retval =
vm_map(mach_task_self(), &address, size, 0, VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE, m_shm_entry,
offset, false, prot, prot, VM_INHERIT_DEFAULT);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "MapInMemoryRegion failed: vm_map returned {0:#x}", retval);
return nullptr;
}
return reinterpret_cast<void*>(address);
}
void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
{
vm_address_t address = reinterpret_cast<vm_address_t>(view);
kern_return_t retval =
vm_allocate(mach_task_self(), &address, size, VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "UnmapFromMemoryRegion failed: vm_allocate returned {0:#x}", retval);
return;
}
retval = vm_protect(mach_task_self(), address, size, true, VM_PROT_NONE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "UnmapFromMemoryRegion failed: vm_prot returned {0:#x}", retval);
}
}
LazyMemoryRegion::LazyMemoryRegion() = default;
LazyMemoryRegion::~LazyMemoryRegion()
{
Release();
}
void* LazyMemoryRegion::Create(size_t size)
{
ASSERT(!m_memory);
if (size == 0)
return nullptr;
vm_address_t memory = 0;
kern_return_t retval = vm_allocate(mach_task_self(), &memory, size, VM_FLAGS_ANYWHERE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "Failed to allocate memory space: {0:#x}", retval);
return nullptr;
}
m_memory = reinterpret_cast<void*>(memory);
m_size = size;
return m_memory;
}
void LazyMemoryRegion::Clear()
{
ASSERT(m_memory);
vm_address_t new_memory = reinterpret_cast<vm_address_t>(m_memory);
kern_return_t retval =
vm_allocate(mach_task_self(), &new_memory, m_size, VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE);
if (retval != KERN_SUCCESS)
{
ERROR_LOG_FMT(MEMMAP, "Failed to reallocate memory space: {0:#x}", retval);
m_memory = nullptr;
return;
}
m_memory = reinterpret_cast<void*>(new_memory);
}
void LazyMemoryRegion::Release()
{
if (m_memory)
{
vm_deallocate(mach_task_self(), reinterpret_cast<vm_address_t>(m_memory), m_size);
}
m_memory = nullptr;
m_size = 0;
}
} // namespace Common
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