public Translator(IJitMemoryAllocator allocator, IMemoryManager memory)
{
_memory = memory;
_funcs = new ConcurrentDictionary <ulong, TranslatedFunction>();
_backgroundStack = new ConcurrentStack <RejitRequest>();
_backgroundTranslatorEvent = new AutoResetEvent(false);
_jumpTable = new JumpTable(allocator);
JitCache.Initialize(allocator);
DirectCallStubs.InitializeStubs();
if (Ptc.State == PtcState.Enabled)
{
Ptc.LoadTranslations(_funcs, memory.PageTablePointer, _jumpTable);
}
}
public void Execute(State.ExecutionContext context, ulong address)
{
if (Interlocked.Increment(ref _threadCount) == 1)
{
IsReadyForTranslation.WaitOne();
Debug.Assert(_jumpTable == null);
_jumpTable = new JumpTable(_allocator);
if (Ptc.State == PtcState.Enabled)
{
Debug.Assert(_funcs.Count == 0);
Ptc.LoadTranslations(_funcs, _memory, _jumpTable);
Ptc.MakeAndSaveTranslations(_funcs, _memory, _jumpTable);
}
PtcProfiler.Start();
Ptc.Disable();
// Simple heuristic, should be user configurable in future. (1 for 4 core/ht or less, 2 for 6 core+ht etc).
// 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.
// If we only have one rejit thread, it should be normal priority as highCq code is performance critical.
// TODO: Use physical cores rather than logical. This only really makes sense for processors with hyperthreading. Requires OS specific code.
int unboundedThreadCount = Math.Max(1, (Environment.ProcessorCount - 6) / 3);
int threadCount = Math.Min(4, unboundedThreadCount);
for (int i = 0; i < threadCount; i++)
{
bool last = i != 0 && i == unboundedThreadCount - 1;
Thread backgroundTranslatorThread = new Thread(TranslateStackedSubs)
{
Name = "CPU.BackgroundTranslatorThread." + i,
Priority = last ? ThreadPriority.Lowest : ThreadPriority.Normal
};
backgroundTranslatorThread.Start();
}
}
Statistics.InitializeTimer();
NativeInterface.RegisterThread(context, _memory, this);
do
{
address = ExecuteSingle(context, address);
}while (context.Running && address != 0);
NativeInterface.UnregisterThread();
if (Interlocked.Decrement(ref _threadCount) == 0)
{
_backgroundTranslatorEvent.Set();
ClearJitCache();
DisposePools();
_jumpTable.Dispose();
_jumpTable = null;
GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce;
}
}
