167 lines
3.7 KiB
C++
167 lines
3.7 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/MemArena.h"
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#include <cerrno>
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#include <cstddef>
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#include <cstdlib>
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#include <cstring>
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#include <set>
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#include <string>
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#include <fmt/format.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "Common/Assert.h"
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#include "Common/CommonFuncs.h"
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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namespace Common
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{
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MemArena::MemArena() = default;
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MemArena::~MemArena() = default;
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void MemArena::GrabSHMSegment(size_t size, std::string_view base_name)
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{
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const std::string file_name = fmt::format("/{}.{}", base_name, getpid());
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m_shm_fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (m_shm_fd == -1)
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{
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ERROR_LOG_FMT(MEMMAP, "shm_open failed: {}", strerror(errno));
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return;
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}
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shm_unlink(file_name.c_str());
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if (ftruncate(m_shm_fd, size) < 0)
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ERROR_LOG_FMT(MEMMAP, "Failed to allocate low memory space");
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}
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void MemArena::ReleaseSHMSegment()
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{
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close(m_shm_fd);
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}
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void* MemArena::CreateView(s64 offset, size_t size)
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{
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void* retval = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, m_shm_fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG_FMT(MEMMAP, "mmap failed");
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return nullptr;
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}
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else
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{
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return retval;
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}
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}
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void MemArena::ReleaseView(void* view, size_t size)
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{
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munmap(view, size);
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}
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u8* MemArena::ReserveMemoryRegion(size_t memory_size)
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{
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const int flags = MAP_ANON | MAP_PRIVATE;
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void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
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if (base == MAP_FAILED)
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{
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PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
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return nullptr;
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}
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m_reserved_region = base;
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m_reserved_region_size = memory_size;
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return static_cast<u8*>(base);
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}
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void MemArena::ReleaseMemoryRegion()
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{
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if (m_reserved_region)
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{
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munmap(m_reserved_region, m_reserved_region_size);
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m_reserved_region = nullptr;
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}
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}
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void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
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{
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void* retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, m_shm_fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG_FMT(MEMMAP, "mmap failed");
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return nullptr;
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}
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else
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{
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return retval;
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}
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}
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void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
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{
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void* retval = mmap(view, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if (retval == MAP_FAILED)
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NOTICE_LOG_FMT(MEMMAP, "mmap failed");
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}
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LazyMemoryRegion::LazyMemoryRegion() = default;
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LazyMemoryRegion::~LazyMemoryRegion()
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{
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Release();
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}
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#if !defined MAP_NORESERVE && (defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__)
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// BSD does not implement MAP_NORESERVE, so define the flag to nothing.
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// See https://reviews.freebsd.org/rS273250
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#define MAP_NORESERVE 0
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#endif
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void* LazyMemoryRegion::Create(size_t size)
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{
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ASSERT(!m_memory);
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if (size == 0)
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return nullptr;
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void* memory =
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mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
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if (memory == MAP_FAILED)
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{
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NOTICE_LOG_FMT(MEMMAP, "Memory allocation of {} bytes failed.", size);
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return nullptr;
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}
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m_memory = memory;
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m_size = size;
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return memory;
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}
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void LazyMemoryRegion::Clear()
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{
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ASSERT(m_memory);
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void* new_memory = mmap(m_memory, m_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, -1, 0);
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ASSERT(new_memory == m_memory);
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}
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void LazyMemoryRegion::Release()
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{
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if (m_memory)
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{
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munmap(m_memory, m_size);
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m_memory = nullptr;
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m_size = 0;
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}
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}
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} // namespace Common
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