90163087a0
* PPTC vs. giant ExeFS. * InternalVersion = 2168 * Add new heuristic algorithm for calculating the number of threads for parallel translations that also takes into account the user's free physical memory and not just the number of CPU cores. * Nit. * Add an outer Header structure and add the hashes for both this new structure and the existing "inner" Header structure. * InternalVersion = 2169
452 lines
15 KiB
C#
452 lines
15 KiB
C#
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.State;
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using ARMeilleure.Translation.Cache;
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using ARMeilleure.Translation.PTC;
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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.Linq;
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using System.Runtime;
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using System.Threading;
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using static ARMeilleure.Common.BitMapPool;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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using static ARMeilleure.IntermediateRepresentation.OperationHelper;
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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 readonly IJitMemoryAllocator _allocator;
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private readonly IMemoryManager _memory;
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private readonly ConcurrentDictionary<ulong, TranslatedFunction> _funcs;
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private readonly ConcurrentQueue<KeyValuePair<ulong, IntPtr>> _oldFuncs;
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private readonly ConcurrentStack<RejitRequest> _backgroundStack;
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private readonly AutoResetEvent _backgroundTranslatorEvent;
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private readonly ReaderWriterLock _backgroundTranslatorLock;
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private JumpTable _jumpTable;
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internal JumpTable JumpTable => _jumpTable;
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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 ManualResetEvent IsReadyForTranslation = new ManualResetEvent(false);
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public Translator(IJitMemoryAllocator allocator, IMemoryManager memory)
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{
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_allocator = allocator;
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_memory = memory;
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_funcs = new ConcurrentDictionary<ulong, TranslatedFunction>();
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_oldFuncs = new ConcurrentQueue<KeyValuePair<ulong, IntPtr>>();
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_backgroundStack = new ConcurrentStack<RejitRequest>();
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_backgroundTranslatorEvent = new AutoResetEvent(false);
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_backgroundTranslatorLock = new ReaderWriterLock();
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JitCache.Initialize(allocator);
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DirectCallStubs.InitializeStubs();
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}
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private void TranslateStackedSubs()
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{
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while (_threadCount != 0)
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{
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_backgroundTranslatorLock.AcquireReaderLock(Timeout.Infinite);
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if (_backgroundStack.TryPop(out RejitRequest request))
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{
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TranslatedFunction func = Translate(_memory, _jumpTable, request.Address, request.Mode, highCq: true);
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_funcs.AddOrUpdate(request.Address, 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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_jumpTable.RegisterFunction(request.Address, func);
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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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_backgroundTranslatorLock.ReleaseReaderLock();
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}
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else
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{
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_backgroundTranslatorLock.ReleaseReaderLock();
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_backgroundTranslatorEvent.WaitOne();
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}
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}
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_backgroundTranslatorEvent.Set(); // Wake up any other background translator threads, to encourage them to exit.
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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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Debug.Assert(_jumpTable == null);
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_jumpTable = new JumpTable(_allocator);
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if (Ptc.State == PtcState.Enabled)
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{
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Debug.Assert(_funcs.Count == 0);
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Ptc.LoadTranslations(_funcs, _memory, _jumpTable);
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Ptc.MakeAndSaveTranslations(_funcs, _memory, _jumpTable);
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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 etc).
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// All threads are normal priority except from the last, which just fills as much of the last core as the os lets it with a low priority.
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// If we only have one rejit thread, it should be normal priority as highCq code is performance critical.
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// TODO: Use physical cores rather than logical. This only really makes sense for processors with 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(TranslateStackedSubs)
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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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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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NativeInterface.UnregisterThread();
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if (Interlocked.Decrement(ref _threadCount) == 0)
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{
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_backgroundTranslatorEvent.Set();
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ClearJitCache();
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DisposePools();
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_jumpTable.Dispose();
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_jumpTable = null;
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GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce;
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}
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}
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public 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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internal TranslatedFunction GetOrTranslate(ulong address, ExecutionMode mode, bool hintRejit = false)
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{
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if (!_funcs.TryGetValue(address, out TranslatedFunction func))
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{
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func = Translate(_memory, _jumpTable, address, mode, highCq: false);
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TranslatedFunction getFunc = _funcs.GetOrAdd(address, func);
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if (getFunc != func)
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{
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JitCache.Unmap(func.FuncPtr);
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func = getFunc;
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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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}
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if (hintRejit && func.ShouldRejit())
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{
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_backgroundStack.Push(new RejitRequest(address, mode));
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_backgroundTranslatorEvent.Set();
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}
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return func;
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}
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internal static TranslatedFunction Translate(IMemoryManager memory, JumpTable jumpTable, ulong address, ExecutionMode mode, bool highCq)
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{
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ArmEmitterContext context = new ArmEmitterContext(memory, jumpTable, address, highCq, Aarch32Mode.User);
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Logger.StartPass(PassName.Decoding);
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Block[] blocks = Decoder.Decode(memory, address, mode, highCq, singleBlock: false);
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Logger.EndPass(PassName.Decoding);
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PreparePool(highCq ? 1 : 0);
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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);
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ulong funcSize = funcRange.End - funcRange.Start;
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Logger.EndPass(PassName.Translation);
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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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OperandType[] argTypes = new OperandType[] { OperandType.I64 };
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CompilerOptions options = highCq ? CompilerOptions.HighCq : CompilerOptions.None;
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GuestFunction func;
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if (Ptc.State == PtcState.Disabled)
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{
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func = Compiler.Compile<GuestFunction>(cfg, argTypes, OperandType.I64, options);
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ResetPool(highCq ? 1 : 0);
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}
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else
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{
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using PtcInfo ptcInfo = new PtcInfo();
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func = Compiler.Compile<GuestFunction>(cfg, argTypes, OperandType.I64, options, ptcInfo);
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ResetPool(highCq ? 1 : 0);
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Ptc.WriteInfoCodeRelocUnwindInfo(address, funcSize, highCq, ptcInfo);
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}
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return new TranslatedFunction(func, funcSize, highCq);
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}
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internal static void PreparePool(int groupId = 0)
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{
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PrepareOperandPool(groupId);
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PrepareOperationPool(groupId);
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}
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internal static void ResetPool(int groupId = 0)
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{
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ResetOperationPool(groupId);
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ResetOperandPool(groupId);
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}
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internal static void DisposePools()
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{
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DisposeOperandPools();
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DisposeOperationPools();
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DisposeBitMapPools();
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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(ArmEmitterContext context, Block[] blocks, out Range range)
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{
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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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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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InstEmitFlowHelper.EmitTailContinue(context, Const(block.Address), block.TailCall);
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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 = null;
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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 != null)
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{
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context.MarkLabel(lblPredicateSkip);
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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 EmitSynchronization(EmitterContext context)
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{
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long countOffs = NativeContext.GetCounterOffset();
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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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Operand lblNonZero = Label();
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Operand lblExit = Label();
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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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// TODO: Completely remove functions overlapping the specified range from the cache.
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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 KeyValuePair<ulong, IntPtr>(guestAddress, func.FuncPtr));
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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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foreach (var kv in _funcs)
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{
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JitCache.Unmap(kv.Value.FuncPtr);
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}
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_funcs.Clear();
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while (_oldFuncs.TryDequeue(out var kv))
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{
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JitCache.Unmap(kv.Value);
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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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_backgroundTranslatorLock.AcquireWriterLock(Timeout.Infinite);
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if (allowRequeue)
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{
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while (_backgroundStack.TryPop(out var request))
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{
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if (_funcs.TryGetValue(request.Address, out var func))
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{
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func.ResetCallCount();
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}
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}
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}
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else
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{
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_backgroundStack.Clear();
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}
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_backgroundTranslatorLock.ReleaseWriterLock();
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}
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}
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}
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