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using ARMeilleure.Memory;
using Ryujinx.Memory;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
namespace Ryujinx.Cpu.LightningJit.Cache
{
static partial class JitCache
{
private static readonly int _pageSize = (int)MemoryBlock.GetPageSize();
private static readonly int _pageMask = _pageSize - 1;
private const int CodeAlignment = 4; // Bytes.
private const int CacheSize = 2047 * 1024 * 1024;
private static ReservedRegion _jitRegion;
private static JitCacheInvalidation _jitCacheInvalidator;
private static CacheMemoryAllocator _cacheAllocator;
private static readonly List<CacheEntry> _cacheEntries = new();
private static readonly object _lock = new();
private static bool _initialized;
[SupportedOSPlatform("windows")]
[LibraryImport("kernel32.dll", SetLastError = true)]
public static partial IntPtr FlushInstructionCache(IntPtr hProcess, IntPtr lpAddress, UIntPtr dwSize);
public static void Initialize(IJitMemoryAllocator allocator)
{
if (_initialized)
{
return;
}
lock (_lock)
{
if (_initialized)
{
return;
}
_jitRegion = new ReservedRegion(allocator, CacheSize);
if (!OperatingSystem.IsWindows() && !OperatingSystem.IsMacOS())
{
_jitCacheInvalidator = new JitCacheInvalidation(allocator);
}
_cacheAllocator = new CacheMemoryAllocator(CacheSize);
_initialized = true;
}
}
public unsafe static IntPtr Map(ReadOnlySpan<byte> code)
{
lock (_lock)
{
Debug.Assert(_initialized);
int funcOffset = Allocate(code.Length);
IntPtr funcPtr = _jitRegion.Pointer + funcOffset;
if (OperatingSystem.IsMacOS() && RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
{
unsafe
{
fixed (byte* codePtr = code)
{
JitSupportDarwin.Copy(funcPtr, (IntPtr)codePtr, (ulong)code.Length);
}
}
}
else
{
ReprotectAsWritable(funcOffset, code.Length);
code.CopyTo(new Span<byte>((void*)funcPtr, code.Length));
ReprotectAsExecutable(funcOffset, code.Length);
if (OperatingSystem.IsWindows() && RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
{
FlushInstructionCache(Process.GetCurrentProcess().Handle, funcPtr, (UIntPtr)code.Length);
}
else
{
_jitCacheInvalidator?.Invalidate(funcPtr, (ulong)code.Length);
}
}
Add(funcOffset, code.Length);
return funcPtr;
}
}
public static void Unmap(IntPtr pointer)
{
lock (_lock)
{
Debug.Assert(_initialized);
int funcOffset = (int)(pointer.ToInt64() - _jitRegion.Pointer.ToInt64());
if (TryFind(funcOffset, out CacheEntry entry, out int entryIndex) && entry.Offset == funcOffset)
{
_cacheAllocator.Free(funcOffset, AlignCodeSize(entry.Size));
_cacheEntries.RemoveAt(entryIndex);
}
}
}
private static void ReprotectAsWritable(int offset, int size)
{
int endOffs = offset + size;
int regionStart = offset & ~_pageMask;
int regionEnd = (endOffs + _pageMask) & ~_pageMask;
_jitRegion.Block.MapAsRwx((ulong)regionStart, (ulong)(regionEnd - regionStart));
}
private static void ReprotectAsExecutable(int offset, int size)
{
int endOffs = offset + size;
int regionStart = offset & ~_pageMask;
int regionEnd = (endOffs + _pageMask) & ~_pageMask;
_jitRegion.Block.MapAsRx((ulong)regionStart, (ulong)(regionEnd - regionStart));
}
private static int Allocate(int codeSize)
{
codeSize = AlignCodeSize(codeSize);
int allocOffset = _cacheAllocator.Allocate(codeSize);
if (allocOffset < 0)
{
throw new OutOfMemoryException("JIT Cache exhausted.");
}
_jitRegion.ExpandIfNeeded((ulong)allocOffset + (ulong)codeSize);
return allocOffset;
}
private static int AlignCodeSize(int codeSize)
{
return checked(codeSize + (CodeAlignment - 1)) & ~(CodeAlignment - 1);
}
private static void Add(int offset, int size)
{
CacheEntry entry = new(offset, size);
int index = _cacheEntries.BinarySearch(entry);
if (index < 0)
{
index = ~index;
}
_cacheEntries.Insert(index, entry);
}
public static bool TryFind(int offset, out CacheEntry entry, out int entryIndex)
{
lock (_lock)
{
int index = _cacheEntries.BinarySearch(new CacheEntry(offset, 0));
if (index < 0)
{
index = ~index - 1;
}
if (index >= 0)
{
entry = _cacheEntries[index];
entryIndex = index;
return true;
}
}
entry = default;
entryIndex = 0;
return false;
}
}
}
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