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using ARMeilleure.Common;
using ARMeilleure.Memory;
using Ryujinx.Cpu.Jit;
using Ryujinx.Cpu.LightningJit.Cache;
using Ryujinx.Cpu.LightningJit.CodeGen.Arm64;
using Ryujinx.Cpu.LightningJit.State;
using Ryujinx.Cpu.Signal;
using Ryujinx.Memory;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Threading;
namespace Ryujinx.Cpu.LightningJit
{
class Translator : IDisposable
{
// Should be enabled on platforms that enforce W^X.
private static bool IsNoWxPlatform => false;
private static readonly AddressTable<ulong>.Level[] _levels64Bit =
new AddressTable<ulong>.Level[]
{
new(31, 17),
new(23, 8),
new(15, 8),
new( 7, 8),
new( 2, 5),
};
private static readonly AddressTable<ulong>.Level[] _levels32Bit =
new AddressTable<ulong>.Level[]
{
new(23, 9),
new(15, 8),
new( 7, 8),
new( 1, 6),
};
private readonly ConcurrentQueue<KeyValuePair<ulong, TranslatedFunction>> _oldFuncs;
private readonly NoWxCache _noWxCache;
private bool _disposed;
internal TranslatorCache<TranslatedFunction> Functions { get; }
internal AddressTable<ulong> FunctionTable { get; }
internal TranslatorStubs Stubs { get; }
internal IMemoryManager Memory { get; }
public Translator(IMemoryManager memory, bool for64Bits)
{
Memory = memory;
_oldFuncs = new ConcurrentQueue<KeyValuePair<ulong, TranslatedFunction>>();
if (IsNoWxPlatform)
{
_noWxCache = new(new JitMemoryAllocator(), CreateStackWalker(), this);
}
else
{
JitCache.Initialize(new JitMemoryAllocator(forJit: true));
}
Functions = new TranslatorCache<TranslatedFunction>();
FunctionTable = new AddressTable<ulong>(for64Bits ? _levels64Bit : _levels32Bit);
Stubs = new TranslatorStubs(FunctionTable, _noWxCache);
FunctionTable.Fill = (ulong)Stubs.SlowDispatchStub;
if (memory.Type.IsHostMapped())
{
NativeSignalHandler.InitializeSignalHandler(MemoryBlock.GetPageSize());
}
}
private static IStackWalker CreateStackWalker()
{
if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
{
return new StackWalker();
}
else
{
throw new PlatformNotSupportedException();
}
}
public void Execute(State.ExecutionContext context, ulong address)
{
ObjectDisposedException.ThrowIf(_disposed, this);
NativeInterface.RegisterThread(context, Memory, this);
Stubs.DispatchLoop(context.NativeContextPtr, address);
NativeInterface.UnregisterThread();
_noWxCache?.ClearEntireThreadLocalCache();
}
internal IntPtr GetOrTranslatePointer(IntPtr framePointer, ulong address, ExecutionMode mode)
{
if (_noWxCache != null)
{
CompiledFunction func = Compile(address, mode);
return _noWxCache.Map(framePointer, func.Code, address, (ulong)func.GuestCodeLength);
}
return GetOrTranslate(address, mode).FuncPointer;
}
private TranslatedFunction GetOrTranslate(ulong address, ExecutionMode mode)
{
if (!Functions.TryGetValue(address, out TranslatedFunction func))
{
func = Translate(address, mode);
TranslatedFunction oldFunc = Functions.GetOrAdd(address, func.GuestSize, func);
if (oldFunc != func)
{
JitCache.Unmap(func.FuncPointer);
func = oldFunc;
}
RegisterFunction(address, func);
}
return func;
}
internal void RegisterFunction(ulong guestAddress, TranslatedFunction func)
{
if (FunctionTable.IsValid(guestAddress))
{
Volatile.Write(ref FunctionTable.GetValue(guestAddress), (ulong)func.FuncPointer);
}
}
private TranslatedFunction Translate(ulong address, ExecutionMode mode)
{
CompiledFunction func = Compile(address, mode);
IntPtr funcPointer = JitCache.Map(func.Code);
return new TranslatedFunction(funcPointer, (ulong)func.GuestCodeLength);
}
private CompiledFunction Compile(ulong address, ExecutionMode mode)
{
return AarchCompiler.Compile(CpuPresets.CortexA57, Memory, address, FunctionTable, Stubs.DispatchStub, mode, RuntimeInformation.ProcessArchitecture);
}
public void InvalidateJitCacheRegion(ulong address, ulong size)
{
ulong[] overlapAddresses = Array.Empty<ulong>();
int overlapsCount = Functions.GetOverlaps(address, size, ref overlapAddresses);
for (int index = 0; index < overlapsCount; index++)
{
ulong overlapAddress = overlapAddresses[index];
if (Functions.TryGetValue(overlapAddress, out TranslatedFunction overlap))
{
Functions.Remove(overlapAddress);
Volatile.Write(ref FunctionTable.GetValue(overlapAddress), FunctionTable.Fill);
EnqueueForDeletion(overlapAddress, overlap);
}
}
// TODO: Remove overlapping functions from the JitCache aswell.
// This should be done safely, with a mechanism to ensure the function is not being executed.
}
private void EnqueueForDeletion(ulong guestAddress, TranslatedFunction func)
{
_oldFuncs.Enqueue(new(guestAddress, func));
}
private void ClearJitCache()
{
List<TranslatedFunction> functions = Functions.AsList();
foreach (var func in functions)
{
JitCache.Unmap(func.FuncPointer);
}
Functions.Clear();
while (_oldFuncs.TryDequeue(out var kv))
{
JitCache.Unmap(kv.Value.FuncPointer);
}
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
if (_noWxCache != null)
{
_noWxCache.Dispose();
}
else
{
ClearJitCache();
}
Stubs.Dispose();
FunctionTable.Dispose();
}
_disposed = true;
}
}
public void Dispose()
{
Dispose(disposing: true);
GC.SuppressFinalize(this);
}
}
}
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