536 lines
18 KiB
C#
536 lines
18 KiB
C#
using ARMeilleure.CodeGen;
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using ARMeilleure.Common;
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using ARMeilleure.Decoders;
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using ARMeilleure.Diagnostics;
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using ARMeilleure.Instructions;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.Memory;
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using ARMeilleure.Signal;
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using ARMeilleure.State;
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using ARMeilleure.Translation.Cache;
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using ARMeilleure.Translation.PTC;
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using Ryujinx.Common;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Threading;
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using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
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namespace ARMeilleure.Translation
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{
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public class Translator
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{
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private static readonly AddressTable<ulong>.Level[] Levels64Bit =
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new AddressTable<ulong>.Level[]
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{
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new(31, 17),
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new(23, 8),
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new(15, 8),
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new( 7, 8),
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new( 2, 5)
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};
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private static readonly AddressTable<ulong>.Level[] Levels32Bit =
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new AddressTable<ulong>.Level[]
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{
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new(31, 17),
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new(23, 8),
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new(15, 8),
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new( 7, 8),
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new( 1, 6)
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};
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private readonly IJitMemoryAllocator _allocator;
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private readonly ConcurrentQueue<KeyValuePair<ulong, TranslatedFunction>> _oldFuncs;
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internal TranslatorCache<TranslatedFunction> Functions { get; }
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internal AddressTable<ulong> FunctionTable { get; }
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internal EntryTable<uint> CountTable { get; }
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internal TranslatorStubs Stubs { get; }
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internal TranslatorQueue Queue { get; }
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internal IMemoryManager Memory { get; }
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private volatile int _threadCount;
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// FIXME: Remove this once the init logic of the emulator will be redone.
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public static readonly ManualResetEvent IsReadyForTranslation = new(false);
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public Translator(IJitMemoryAllocator allocator, IMemoryManager memory, bool for64Bits)
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{
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_allocator = allocator;
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Memory = memory;
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_oldFuncs = new ConcurrentQueue<KeyValuePair<ulong, TranslatedFunction>>();
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Queue = new TranslatorQueue();
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JitCache.Initialize(allocator);
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CountTable = new EntryTable<uint>();
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Functions = new TranslatorCache<TranslatedFunction>();
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FunctionTable = new AddressTable<ulong>(for64Bits ? Levels64Bit : Levels32Bit);
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Stubs = new TranslatorStubs(this);
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FunctionTable.Fill = (ulong)Stubs.SlowDispatchStub;
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if (memory.Type.IsHostMapped())
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{
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NativeSignalHandler.InitializeSignalHandler();
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}
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}
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public void Execute(State.ExecutionContext context, ulong address)
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{
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if (Interlocked.Increment(ref _threadCount) == 1)
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{
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IsReadyForTranslation.WaitOne();
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if (Ptc.State == PtcState.Enabled)
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{
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Debug.Assert(Functions.Count == 0);
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Ptc.LoadTranslations(this);
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Ptc.MakeAndSaveTranslations(this);
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}
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PtcProfiler.Start();
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Ptc.Disable();
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// Simple heuristic, should be user configurable in future. (1 for 4 core/ht or less, 2 for 6 core + ht
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// etc). All threads are normal priority except from the last, which just fills as much of the last core
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// as the os lets it with a low priority. If we only have one rejit thread, it should be normal priority
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// as highCq code is performance critical.
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//
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// TODO: Use physical cores rather than logical. This only really makes sense for processors with
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// hyperthreading. Requires OS specific code.
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int unboundedThreadCount = Math.Max(1, (Environment.ProcessorCount - 6) / 3);
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int threadCount = Math.Min(4, unboundedThreadCount);
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for (int i = 0; i < threadCount; i++)
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{
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bool last = i != 0 && i == unboundedThreadCount - 1;
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Thread backgroundTranslatorThread = new Thread(BackgroundTranslate)
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{
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Name = "CPU.BackgroundTranslatorThread." + i,
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Priority = last ? ThreadPriority.Lowest : ThreadPriority.Normal
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};
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backgroundTranslatorThread.Start();
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}
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}
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Statistics.InitializeTimer();
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NativeInterface.RegisterThread(context, Memory, this);
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if (Optimizations.UseUnmanagedDispatchLoop)
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{
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Stubs.DispatchLoop(context.NativeContextPtr, address);
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}
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else
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{
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do
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{
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address = ExecuteSingle(context, address);
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}
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while (context.Running && address != 0);
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}
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NativeInterface.UnregisterThread();
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if (Interlocked.Decrement(ref _threadCount) == 0)
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{
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ClearJitCache();
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Queue.Dispose();
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Stubs.Dispose();
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FunctionTable.Dispose();
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CountTable.Dispose();
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}
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}
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private ulong ExecuteSingle(State.ExecutionContext context, ulong address)
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{
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TranslatedFunction func = GetOrTranslate(address, context.ExecutionMode);
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Statistics.StartTimer();
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ulong nextAddr = func.Execute(context);
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Statistics.StopTimer(address);
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return nextAddr;
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}
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public ulong Step(State.ExecutionContext context, ulong address)
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{
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TranslatedFunction func = Translate(address, context.ExecutionMode, highCq: false, singleStep: true);
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address = func.Execute(context);
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EnqueueForDeletion(address, func);
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return address;
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}
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internal TranslatedFunction GetOrTranslate(ulong address, ExecutionMode mode)
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{
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if (!Functions.TryGetValue(address, out TranslatedFunction func))
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{
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func = Translate(address, mode, highCq: false);
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TranslatedFunction oldFunc = Functions.GetOrAdd(address, func.GuestSize, func);
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if (oldFunc != func)
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{
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JitCache.Unmap(func.FuncPtr);
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func = oldFunc;
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}
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if (PtcProfiler.Enabled)
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{
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PtcProfiler.AddEntry(address, mode, highCq: false);
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}
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RegisterFunction(address, func);
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}
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return func;
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}
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internal void RegisterFunction(ulong guestAddress, TranslatedFunction func)
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{
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if (FunctionTable.IsValid(guestAddress) && (Optimizations.AllowLcqInFunctionTable || func.HighCq))
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{
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Volatile.Write(ref FunctionTable.GetValue(guestAddress), (ulong)func.FuncPtr);
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}
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}
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internal TranslatedFunction Translate(ulong address, ExecutionMode mode, bool highCq, bool singleStep = false)
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{
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var context = new ArmEmitterContext(
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Memory,
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CountTable,
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FunctionTable,
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Stubs,
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address,
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highCq,
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mode: Aarch32Mode.User);
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Logger.StartPass(PassName.Decoding);
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Block[] blocks = Decoder.Decode(Memory, address, mode, highCq, singleStep ? DecoderMode.SingleInstruction : DecoderMode.MultipleBlocks);
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Logger.EndPass(PassName.Decoding);
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Logger.StartPass(PassName.Translation);
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EmitSynchronization(context);
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if (blocks[0].Address != address)
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{
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context.Branch(context.GetLabel(address));
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}
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ControlFlowGraph cfg = EmitAndGetCFG(context, blocks, out Range funcRange, out Counter<uint> counter);
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ulong funcSize = funcRange.End - funcRange.Start;
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Logger.EndPass(PassName.Translation, cfg);
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Logger.StartPass(PassName.RegisterUsage);
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RegisterUsage.RunPass(cfg, mode);
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Logger.EndPass(PassName.RegisterUsage);
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var retType = OperandType.I64;
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var argTypes = new OperandType[] { OperandType.I64 };
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var options = highCq ? CompilerOptions.HighCq : CompilerOptions.None;
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if (context.HasPtc && !singleStep)
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{
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options |= CompilerOptions.Relocatable;
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}
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CompiledFunction compiledFunc = Compiler.Compile(cfg, argTypes, retType, options);
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if (context.HasPtc && !singleStep)
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{
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Hash128 hash = Ptc.ComputeHash(Memory, address, funcSize);
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Ptc.WriteCompiledFunction(address, funcSize, hash, highCq, compiledFunc);
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}
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GuestFunction func = compiledFunc.Map<GuestFunction>();
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Allocators.ResetAll();
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return new TranslatedFunction(func, counter, funcSize, highCq);
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}
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private void BackgroundTranslate()
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{
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while (_threadCount != 0 && Queue.TryDequeue(out RejitRequest request))
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{
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TranslatedFunction func = Translate(request.Address, request.Mode, highCq: true);
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Functions.AddOrUpdate(request.Address, func.GuestSize, func, (key, oldFunc) =>
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{
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EnqueueForDeletion(key, oldFunc);
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return func;
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});
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if (PtcProfiler.Enabled)
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{
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PtcProfiler.UpdateEntry(request.Address, request.Mode, highCq: true);
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}
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RegisterFunction(request.Address, func);
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}
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}
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private struct Range
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{
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public ulong Start { get; }
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public ulong End { get; }
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public Range(ulong start, ulong end)
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{
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Start = start;
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End = end;
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}
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}
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private static ControlFlowGraph EmitAndGetCFG(
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ArmEmitterContext context,
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Block[] blocks,
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out Range range,
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out Counter<uint> counter)
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{
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counter = null;
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ulong rangeStart = ulong.MaxValue;
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ulong rangeEnd = 0;
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for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
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{
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Block block = blocks[blkIndex];
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if (!block.Exit)
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{
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if (rangeStart > block.Address)
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{
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rangeStart = block.Address;
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}
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if (rangeEnd < block.EndAddress)
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{
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rangeEnd = block.EndAddress;
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}
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}
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if (block.Address == context.EntryAddress && !context.HighCq)
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{
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EmitRejitCheck(context, out counter);
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}
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context.CurrBlock = block;
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context.MarkLabel(context.GetLabel(block.Address));
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if (block.Exit)
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{
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// Left option here as it may be useful if we need to return to managed rather than tail call in
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// future. (eg. for debug)
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bool useReturns = false;
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InstEmitFlowHelper.EmitVirtualJump(context, Const(block.Address), isReturn: useReturns);
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}
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else
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{
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for (int opcIndex = 0; opcIndex < block.OpCodes.Count; opcIndex++)
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{
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OpCode opCode = block.OpCodes[opcIndex];
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context.CurrOp = opCode;
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bool isLastOp = opcIndex == block.OpCodes.Count - 1;
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if (isLastOp && block.Branch != null && !block.Branch.Exit && block.Branch.Address <= block.Address)
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{
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EmitSynchronization(context);
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}
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Operand lblPredicateSkip = default;
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if (context.IsInIfThenBlock && context.CurrentIfThenBlockCond != Condition.Al)
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{
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lblPredicateSkip = Label();
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InstEmitFlowHelper.EmitCondBranch(context, lblPredicateSkip, context.CurrentIfThenBlockCond.Invert());
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}
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if (opCode is OpCode32 op && op.Cond < Condition.Al)
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{
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lblPredicateSkip = Label();
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InstEmitFlowHelper.EmitCondBranch(context, lblPredicateSkip, op.Cond.Invert());
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}
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if (opCode.Instruction.Emitter != null)
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{
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opCode.Instruction.Emitter(context);
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}
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else
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{
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throw new InvalidOperationException($"Invalid instruction \"{opCode.Instruction.Name}\".");
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}
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if (lblPredicateSkip != default)
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{
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context.MarkLabel(lblPredicateSkip);
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}
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if (context.IsInIfThenBlock && opCode.Instruction.Name != InstName.It)
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{
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context.AdvanceIfThenBlockState();
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}
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}
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}
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}
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range = new Range(rangeStart, rangeEnd);
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return context.GetControlFlowGraph();
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}
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internal static void EmitRejitCheck(ArmEmitterContext context, out Counter<uint> counter)
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{
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const int MinsCallForRejit = 100;
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counter = new Counter<uint>(context.CountTable);
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Operand lblEnd = Label();
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Operand address = !context.HasPtc ?
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Const(ref counter.Value) :
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Const(ref counter.Value, Ptc.CountTableSymbol);
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Operand curCount = context.Load(OperandType.I32, address);
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Operand count = context.Add(curCount, Const(1));
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context.Store(address, count);
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context.BranchIf(lblEnd, curCount, Const(MinsCallForRejit), Comparison.NotEqual, BasicBlockFrequency.Cold);
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context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.EnqueueForRejit)), Const(context.EntryAddress));
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context.MarkLabel(lblEnd);
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}
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internal static void EmitSynchronization(EmitterContext context)
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{
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long countOffs = NativeContext.GetCounterOffset();
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Operand lblNonZero = Label();
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Operand lblExit = Label();
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Operand countAddr = context.Add(context.LoadArgument(OperandType.I64, 0), Const(countOffs));
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Operand count = context.Load(OperandType.I32, countAddr);
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context.BranchIfTrue(lblNonZero, count, BasicBlockFrequency.Cold);
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Operand running = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.CheckSynchronization)));
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context.BranchIfTrue(lblExit, running, BasicBlockFrequency.Cold);
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context.Return(Const(0L));
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context.MarkLabel(lblNonZero);
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count = context.Subtract(count, Const(1));
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context.Store(countAddr, count);
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context.MarkLabel(lblExit);
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}
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public void InvalidateJitCacheRegion(ulong address, ulong size)
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{
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// If rejit is running, stop it as it may be trying to rejit a function on the invalidated region.
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ClearRejitQueue(allowRequeue: true);
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ulong[] overlapAddresses = Array.Empty<ulong>();
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int overlapsCount = Functions.GetOverlaps(address, size, ref overlapAddresses);
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for (int index = 0; index < overlapsCount; index++)
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{
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ulong overlapAddress = overlapAddresses[index];
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if (Functions.TryGetValue(overlapAddress, out TranslatedFunction overlap))
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{
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Functions.Remove(overlapAddress);
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Volatile.Write(ref FunctionTable.GetValue(overlapAddress), FunctionTable.Fill);
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EnqueueForDeletion(overlapAddress, overlap);
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}
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}
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// TODO: Remove overlapping functions from the JitCache aswell.
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// This should be done safely, with a mechanism to ensure the function is not being executed.
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}
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internal void EnqueueForRejit(ulong guestAddress, ExecutionMode mode)
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{
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Queue.Enqueue(guestAddress, mode);
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}
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private void EnqueueForDeletion(ulong guestAddress, TranslatedFunction func)
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{
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_oldFuncs.Enqueue(new(guestAddress, func));
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}
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private void ClearJitCache()
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{
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// Ensure no attempt will be made to compile new functions due to rejit.
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ClearRejitQueue(allowRequeue: false);
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List<TranslatedFunction> functions = Functions.AsList();
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foreach (var func in functions)
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{
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JitCache.Unmap(func.FuncPtr);
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func.CallCounter?.Dispose();
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}
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Functions.Clear();
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while (_oldFuncs.TryDequeue(out var kv))
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{
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JitCache.Unmap(kv.Value.FuncPtr);
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kv.Value.CallCounter?.Dispose();
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}
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}
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private void ClearRejitQueue(bool allowRequeue)
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{
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if (!allowRequeue)
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{
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Queue.Clear();
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return;
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}
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lock (Queue.Sync)
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{
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while (Queue.Count > 0 && Queue.TryDequeue(out RejitRequest request))
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{
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if (Functions.TryGetValue(request.Address, out var func) && func.CallCounter != null)
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{
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Volatile.Write(ref func.CallCounter.Value, 0);
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}
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}
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}
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}
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}
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}
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