Ryujinx/ChocolArm64/ATranslatedSub.cs

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using ChocolArm64.Memory;
using ChocolArm64.State;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
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using System.Reflection;
using System.Reflection.Emit;
namespace ChocolArm64
{
class ATranslatedSub
{
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private delegate long AA64Subroutine(AThreadState Register, AMemory Memory);
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private AA64Subroutine ExecDelegate;
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public static int StateArgIdx { get; private set; }
public static int MemoryArgIdx { get; private set; }
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public static Type[] FixedArgTypes { get; private set; }
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public DynamicMethod Method { get; private set; }
public ReadOnlyCollection<ARegister> Params { get; private set; }
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private HashSet<long> Callees;
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private ATranslatedSubType Type;
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private int CallCount;
private bool NeedsReJit;
private int MinCallCountForReJit = 250;
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public ATranslatedSub(DynamicMethod Method, List<ARegister> Params, HashSet<long> Callees)
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{
if (Method == null)
{
throw new ArgumentNullException(nameof(Method));
}
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if (Params == null)
{
throw new ArgumentNullException(nameof(Params));
}
if (Callees == null)
{
throw new ArgumentNullException(nameof(Callees));
}
this.Method = Method;
this.Params = Params.AsReadOnly();
this.Callees = Callees;
PrepareDelegate();
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}
static ATranslatedSub()
{
MethodInfo MthdInfo = typeof(AA64Subroutine).GetMethod("Invoke");
ParameterInfo[] Params = MthdInfo.GetParameters();
FixedArgTypes = new Type[Params.Length];
for (int Index = 0; Index < Params.Length; Index++)
{
Type ParamType = Params[Index].ParameterType;
FixedArgTypes[Index] = ParamType;
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if (ParamType == typeof(AThreadState))
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{
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StateArgIdx = Index;
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}
else if (ParamType == typeof(AMemory))
{
MemoryArgIdx = Index;
}
}
}
private void PrepareDelegate()
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{
string Name = $"{Method.Name}_Dispatch";
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DynamicMethod Mthd = new DynamicMethod(Name, typeof(long), FixedArgTypes);
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ILGenerator Generator = Mthd.GetILGenerator();
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Generator.EmitLdargSeq(FixedArgTypes.Length);
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foreach (ARegister Reg in Params)
{
Generator.EmitLdarg(StateArgIdx);
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Generator.Emit(OpCodes.Ldfld, Reg.GetField());
}
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Generator.Emit(OpCodes.Call, Method);
Generator.Emit(OpCodes.Ret);
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ExecDelegate = (AA64Subroutine)Mthd.CreateDelegate(typeof(AA64Subroutine));
}
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public bool ShouldReJit()
{
if (Type == ATranslatedSubType.SubTier0)
{
if (CallCount < MinCallCountForReJit)
{
CallCount++;
}
return CallCount == MinCallCountForReJit;
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}
return Type == ATranslatedSubType.SubTier1 && NeedsReJit;
}
public long Execute(AThreadState ThreadState, AMemory Memory)
{
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return ExecDelegate(ThreadState, Memory);
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}
public void SetType(ATranslatedSubType Type) => this.Type = Type;
public bool HasCallee(long Position) => Callees.Contains(Position);
public void MarkForReJit() => NeedsReJit = true;
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}
}