dolphin/Source/Core/Common/MemoryUtil.cpp

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// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstddef>
#include <cstdlib>
#include <string>
#include "Common/CommonFuncs.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
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#include "Common/MemoryUtil.h"
#include "Common/MsgHandler.h"
#ifdef _WIN32
#include <windows.h>
#include <psapi.h>
#include "Common/StringUtil.h"
#else
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
#include <sys/sysctl.h>
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#elif defined __HAIKU__
#include <OS.h>
#else
#include <sys/sysinfo.h>
#endif
#endif
// Valgrind doesn't support MAP_32BIT.
// Uncomment the following line to be able to run Dolphin in Valgrind.
//#undef MAP_32BIT
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namespace Common
{
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#if !defined(_WIN32) && defined(_M_X86_64) && !defined(MAP_32BIT)
#include <unistd.h>
static uintptr_t RoundPage(uintptr_t addr)
{
uintptr_t mask = getpagesize() - 1;
return (addr + mask) & ~mask;
}
#endif
// This is purposely not a full wrapper for virtualalloc/mmap, but it
// provides exactly the primitive operations that Dolphin needs.
void* AllocateExecutableMemory(size_t size, bool low)
{
#if defined(_WIN32)
void* ptr = VirtualAlloc(0, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
#else
static char* map_hint = nullptr;
#if defined(_M_X86_64) && !defined(MAP_32BIT)
// This OS has no flag to enforce allocation below the 4 GB boundary,
// but if we hint that we want a low address it is very likely we will
// get one.
// An older version of this code used MAP_FIXED, but that has the side
// effect of discarding already mapped pages that happen to be in the
// requested virtual memory range (such as the emulated RAM, sometimes).
if (low && (!map_hint))
map_hint = (char*)RoundPage(512 * 1024 * 1024); /* 0.5 GB rounded up to the next page */
#endif
void* ptr = mmap(map_hint, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE
#if defined(_M_X86_64) && defined(MAP_32BIT)
| (low ? MAP_32BIT : 0)
#endif
,
-1, 0);
#endif /* defined(_WIN32) */
#ifdef _WIN32
if (ptr == nullptr)
{
#else
if (ptr == MAP_FAILED)
{
ptr = nullptr;
#endif
PanicAlert("Failed to allocate executable memory. If you are running Dolphin in Valgrind, try "
"'#undef MAP_32BIT'.");
}
#if !defined(_WIN32) && defined(_M_X86_64) && !defined(MAP_32BIT)
else
{
if (low)
{
map_hint += size;
map_hint = (char*)RoundPage((uintptr_t)map_hint); /* round up to the next page */
}
}
#endif
#if _M_X86_64
if ((u64)ptr >= 0x80000000 && low == true)
PanicAlert("Executable memory ended up above 2GB!");
#endif
return ptr;
}
void* AllocateMemoryPages(size_t size)
{
#ifdef _WIN32
void* ptr = VirtualAlloc(0, size, MEM_COMMIT, PAGE_READWRITE);
#else
void* ptr = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (ptr == MAP_FAILED)
ptr = nullptr;
#endif
if (ptr == nullptr)
PanicAlert("Failed to allocate raw memory");
return ptr;
}
void* AllocateAlignedMemory(size_t size, size_t alignment)
{
#ifdef _WIN32
void* ptr = _aligned_malloc(size, alignment);
#else
void* ptr = nullptr;
if (posix_memalign(&ptr, alignment, size) != 0)
ERROR_LOG(MEMMAP, "Failed to allocate aligned memory");
#endif
if (ptr == nullptr)
PanicAlert("Failed to allocate aligned memory");
return ptr;
}
void FreeMemoryPages(void* ptr, size_t size)
{
if (ptr)
{
bool error_occurred = false;
#ifdef _WIN32
if (!VirtualFree(ptr, 0, MEM_RELEASE))
error_occurred = true;
#else
int retval = munmap(ptr, size);
if (retval != 0)
error_occurred = true;
#endif
if (error_occurred)
PanicAlert("FreeMemoryPages failed!\n%s", GetLastErrorMsg().c_str());
}
}
void FreeAlignedMemory(void* ptr)
{
if (ptr)
{
#ifdef _WIN32
_aligned_free(ptr);
#else
free(ptr);
#endif
}
}
void ReadProtectMemory(void* ptr, size_t size)
{
bool error_occurred = false;
#ifdef _WIN32
DWORD oldValue;
if (!VirtualProtect(ptr, size, PAGE_NOACCESS, &oldValue))
error_occurred = true;
#else
int retval = mprotect(ptr, size, PROT_NONE);
if (retval != 0)
error_occurred = true;
#endif
if (error_occurred)
PanicAlert("ReadProtectMemory failed!\n%s", GetLastErrorMsg().c_str());
}
void WriteProtectMemory(void* ptr, size_t size, bool allowExecute)
{
bool error_occurred = false;
#ifdef _WIN32
DWORD oldValue;
if (!VirtualProtect(ptr, size, allowExecute ? PAGE_EXECUTE_READ : PAGE_READONLY, &oldValue))
error_occurred = true;
#else
int retval = mprotect(ptr, size, allowExecute ? (PROT_READ | PROT_EXEC) : PROT_READ);
if (retval != 0)
error_occurred = true;
#endif
if (error_occurred)
PanicAlert("WriteProtectMemory failed!\n%s", GetLastErrorMsg().c_str());
}
void UnWriteProtectMemory(void* ptr, size_t size, bool allowExecute)
{
bool error_occurred = false;
#ifdef _WIN32
DWORD oldValue;
if (!VirtualProtect(ptr, size, allowExecute ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE, &oldValue))
error_occurred = true;
#else
int retval = mprotect(ptr, size, allowExecute ? (PROT_READ | PROT_WRITE | PROT_EXEC) :
PROT_WRITE | PROT_READ);
if (retval != 0)
error_occurred = true;
#endif
if (error_occurred)
PanicAlert("UnWriteProtectMemory failed!\n%s", GetLastErrorMsg().c_str());
}
std::string MemUsage()
{
#ifdef _WIN32
#pragma comment(lib, "psapi")
DWORD processID = GetCurrentProcessId();
HANDLE hProcess;
PROCESS_MEMORY_COUNTERS pmc;
std::string Ret;
// Print information about the memory usage of the process.
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processID);
if (nullptr == hProcess)
return "MemUsage Error";
if (GetProcessMemoryInfo(hProcess, &pmc, sizeof(pmc)))
Ret = StringFromFormat("%s K", ThousandSeparate(pmc.WorkingSetSize / 1024, 7).c_str());
CloseHandle(hProcess);
return Ret;
#else
return "";
#endif
}
size_t MemPhysical()
{
#ifdef _WIN32
MEMORYSTATUSEX memInfo;
memInfo.dwLength = sizeof(MEMORYSTATUSEX);
GlobalMemoryStatusEx(&memInfo);
return memInfo.ullTotalPhys;
#elif defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
int mib[2];
size_t physical_memory;
mib[0] = CTL_HW;
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#ifdef __APPLE__
mib[1] = HW_MEMSIZE;
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#elif defined __FreeBSD__
mib[1] = HW_REALMEM;
#elif defined __OpenBSD__
mib[1] = HW_PHYSMEM;
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#endif
size_t length = sizeof(size_t);
sysctl(mib, 2, &physical_memory, &length, NULL, 0);
return physical_memory;
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#elif defined __HAIKU__
system_info sysinfo;
get_system_info(&sysinfo);
return static_cast<size_t>(sysinfo.max_pages * B_PAGE_SIZE);
#else
struct sysinfo memInfo;
sysinfo(&memInfo);
return (size_t)memInfo.totalram * memInfo.mem_unit;
#endif
}
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} // namespace Common