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![Alex Barney](/assets/img/avatar_default.png)
* Fix typos * Remove unneeded using statements * Enforce var style more * Remove redundant qualifiers * Fix some indentation * Disable naming warnings on files with external enum names * Fix build * Mass find & replace for comments with no spacing * Standardize todo capitalization and for/if spacing
253 lines
7.9 KiB
C#
253 lines
7.9 KiB
C#
using ChocolArm64.Decoders;
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using ChocolArm64.Events;
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using ChocolArm64.IntermediateRepresentation;
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using ChocolArm64.Memory;
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using ChocolArm64.State;
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using System;
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using System.Reflection.Emit;
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using System.Threading;
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namespace ChocolArm64.Translation
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{
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public class Translator
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{
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private MemoryManager _memory;
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private CpuThreadState _dummyThreadState;
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private TranslatorCache _cache;
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private TranslatorQueue _queue;
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private Thread _backgroundTranslator;
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public event EventHandler<CpuTraceEventArgs> CpuTrace;
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public bool EnableCpuTrace { get; set; }
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private volatile int _threadCount;
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public Translator(MemoryManager memory)
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{
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_memory = memory;
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_dummyThreadState = new CpuThreadState();
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_dummyThreadState.Running = false;
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_cache = new TranslatorCache();
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_queue = new TranslatorQueue();
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}
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internal void ExecuteSubroutine(CpuThread thread, long position)
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{
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if (Interlocked.Increment(ref _threadCount) == 1)
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{
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_backgroundTranslator = new Thread(TranslateQueuedSubs);
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_backgroundTranslator.Start();
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}
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ExecuteSubroutine(thread.ThreadState, position);
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if (Interlocked.Decrement(ref _threadCount) == 0)
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{
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_queue.ForceSignal();
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}
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}
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private void ExecuteSubroutine(CpuThreadState state, long position)
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{
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state.CurrentTranslator = this;
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do
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{
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if (EnableCpuTrace)
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{
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CpuTrace?.Invoke(this, new CpuTraceEventArgs(position));
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}
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if (!_cache.TryGetSubroutine(position, out TranslatedSub sub))
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{
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sub = TranslateLowCq(position, state.GetExecutionMode());
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}
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position = sub.Execute(state, _memory);
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}
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while (position != 0 && state.Running);
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state.CurrentTranslator = null;
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}
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internal ArmSubroutine GetOrTranslateSubroutine(CpuThreadState state, long position, CallType cs)
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{
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if (!_cache.TryGetSubroutine(position, out TranslatedSub sub))
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{
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sub = TranslateLowCq(position, state.GetExecutionMode());
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}
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if (sub.Rejit())
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{
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bool isComplete = cs == CallType.Call ||
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cs == CallType.VirtualCall;
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_queue.Enqueue(position, state.GetExecutionMode(), TranslationTier.Tier1, isComplete);
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}
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return sub.Delegate;
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}
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private void TranslateQueuedSubs()
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{
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while (_threadCount != 0)
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{
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if (_queue.TryDequeue(out TranslatorQueueItem item))
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{
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bool isCached = _cache.TryGetSubroutine(item.Position, out TranslatedSub sub);
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if (isCached && item.Tier <= sub.Tier)
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{
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continue;
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}
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if (item.Tier == TranslationTier.Tier0)
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{
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TranslateLowCq(item.Position, item.Mode);
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}
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else
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{
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TranslateHighCq(item.Position, item.Mode, item.IsComplete);
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}
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}
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else
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{
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_queue.WaitForItems();
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}
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}
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}
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private TranslatedSub TranslateLowCq(long position, ExecutionMode mode)
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{
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Block[] blocks = Decoder.DecodeBasicBlock(_memory, (ulong)position, mode);
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ILEmitterCtx context = new ILEmitterCtx(_memory, _cache, _queue, TranslationTier.Tier0);
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BasicBlock[] bbs = EmitAndGetBlocks(context, blocks);
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TranslatedSubBuilder builder = new TranslatedSubBuilder(mode);
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string name = GetSubroutineName(position);
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TranslatedSub subroutine = builder.Build(bbs, name, TranslationTier.Tier0);
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return _cache.GetOrAdd(position, subroutine, GetOpsCount(bbs));
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}
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private TranslatedSub TranslateHighCq(long position, ExecutionMode mode, bool isComplete)
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{
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Block[] blocks = Decoder.DecodeSubroutine(_memory, (ulong)position, mode);
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ILEmitterCtx context = new ILEmitterCtx(_memory, _cache, _queue, TranslationTier.Tier1);
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if (blocks[0].Address != (ulong)position)
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{
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context.Emit(OpCodes.Br, context.GetLabel(position));
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}
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BasicBlock[] bbs = EmitAndGetBlocks(context, blocks);
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isComplete &= !context.HasIndirectJump;
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TranslatedSubBuilder builder = new TranslatedSubBuilder(mode, isComplete);
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string name = GetSubroutineName(position);
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TranslatedSub subroutine = builder.Build(bbs, name, TranslationTier.Tier1, context.HasSlowCall);
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ForceAheadOfTimeCompilation(subroutine);
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_cache.AddOrUpdate(position, subroutine, GetOpsCount(bbs));
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return subroutine;
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}
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private static BasicBlock[] EmitAndGetBlocks(ILEmitterCtx context, Block[] blocks)
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{
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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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context.CurrBlock = block;
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context.MarkLabel(context.GetLabel((long)block.Address));
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for (int opcIndex = 0; opcIndex < block.OpCodes.Count; opcIndex++)
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{
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OpCode64 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.Address <= block.Address)
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{
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context.EmitSynchronization();
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}
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ILLabel lblPredicateSkip = null;
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if (opCode is OpCode32 op && op.Cond < Condition.Al)
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{
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lblPredicateSkip = new ILLabel();
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context.EmitCondBranch(lblPredicateSkip, op.Cond.Invert());
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}
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opCode.Emitter(context);
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if (lblPredicateSkip != null)
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{
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context.MarkLabel(lblPredicateSkip);
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context.ResetBlockStateForPredicatedOp();
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// If this is the last op on the block, and there's no "next" block
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// after this one, then we have to return right now, with the address
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// of the next instruction to be executed (in the case that the condition
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// is false, and the branch was not taken, as all basic blocks should end
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// with some kind of branch).
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if (isLastOp && block.Next == null)
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{
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context.EmitStoreContext();
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context.EmitLdc_I8(opCode.Position + opCode.OpCodeSizeInBytes);
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context.Emit(OpCodes.Ret);
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}
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}
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}
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}
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return context.GetBlocks();
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}
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private static string GetSubroutineName(long position)
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{
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return $"Sub{position:x16}";
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}
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private static int GetOpsCount(BasicBlock[] blocks)
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{
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int opCount = 0;
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foreach (BasicBlock block in blocks)
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{
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opCount += block.Count;
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}
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return opCount;
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}
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private void ForceAheadOfTimeCompilation(TranslatedSub subroutine)
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{
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subroutine.Execute(_dummyThreadState, null);
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}
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}
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} |