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using ChocolArm64.Decoder;
using ChocolArm64.State;
using System;
using System.Collections.Generic;
using System.Reflection.Emit;
namespace ChocolArm64.Translation
{
class AILEmitter
{
public ALocalAlloc LocalAlloc { get; private set; }
public ILGenerator Generator { get; private set; }
private Dictionary<ARegister, int> Locals;
private AILBlock[] ILBlocks;
private AILBlock Root;
private ATranslatedSub Subroutine;
private string SubName;
private int LocalsCount;
public AILEmitter(ABlock[] Graph, ABlock Root, string SubName)
{
this.SubName = SubName;
Locals = new Dictionary<ARegister, int>();
ILBlocks = new AILBlock[Graph.Length];
AILBlock GetBlock(int Index)
{
if (Index < 0 || Index >= ILBlocks.Length)
{
return null;
}
if (ILBlocks[Index] == null)
{
ILBlocks[Index] = new AILBlock();
}
return ILBlocks[Index];
}
for (int Index = 0; Index < ILBlocks.Length; Index++)
{
AILBlock Block = GetBlock(Index);
Block.Next = GetBlock(Array.IndexOf(Graph, Graph[Index].Next));
Block.Branch = GetBlock(Array.IndexOf(Graph, Graph[Index].Branch));
}
this.Root = ILBlocks[Array.IndexOf(Graph, Root)];
}
public ATranslatedSub GetSubroutine()
{
LocalAlloc = new ALocalAlloc(ILBlocks, Root);
InitSubroutine();
InitLocals();
foreach (AILBlock ILBlock in ILBlocks)
{
ILBlock.Emit(this);
}
return Subroutine;
}
public AILBlock GetILBlock(int Index) => ILBlocks[Index];
private void InitLocals()
{
int ParamsStart = ATranslatedSub.FixedArgTypes.Length;
Locals = new Dictionary<ARegister, int>();
for (int Index = 0; Index < Subroutine.Params.Count; Index++)
{
ARegister Reg = Subroutine.Params[Index];
Generator.EmitLdarg(Index + ParamsStart);
Generator.EmitStloc(GetLocalIndex(Reg));
}
}
private void InitSubroutine()
{
List<ARegister> Params = new List<ARegister>();
void SetParams(long Inputs, ARegisterType BaseType)
{
for (int Bit = 0; Bit < 64; Bit++)
{
long Mask = 1L << Bit;
if ((Inputs & Mask) != 0)
{
Params.Add(GetRegFromBit(Bit, BaseType));
}
}
}
SetParams(LocalAlloc.GetIntInputs(Root), ARegisterType.Int);
SetParams(LocalAlloc.GetVecInputs(Root), ARegisterType.Vector);
DynamicMethod Mthd = new DynamicMethod(SubName, typeof(long), GetParamTypes(Params));
Generator = Mthd.GetILGenerator();
Subroutine = new ATranslatedSub(Mthd, Params);
}
private Type[] GetParamTypes(IList<ARegister> Params)
{
Type[] FixedArgs = ATranslatedSub.FixedArgTypes;
Type[] Output = new Type[Params.Count + FixedArgs.Length];
FixedArgs.CopyTo(Output, 0);
int TypeIdx = FixedArgs.Length;
for (int Index = 0; Index < Params.Count; Index++)
{
Output[TypeIdx++] = GetFieldType(Params[Index].Type);
}
return Output;
}
public int GetLocalIndex(ARegister Reg)
{
if (!Locals.TryGetValue(Reg, out int Index))
{
Generator.DeclareLocal(GetLocalType(Reg));
Index = LocalsCount++;
Locals.Add(Reg, Index);
}
return Index;
}
public Type GetLocalType(ARegister Reg) => GetFieldType(Reg.Type);
public Type GetFieldType(ARegisterType RegType)
{
switch (RegType)
{
case ARegisterType.Flag: return typeof(bool);
case ARegisterType.Int: return typeof(ulong);
case ARegisterType.Vector: return typeof(AVec);
}
throw new ArgumentException(nameof(RegType));
}
public static ARegister GetRegFromBit(int Bit, ARegisterType BaseType)
{
if (Bit < 32)
{
return new ARegister(Bit, BaseType);
}
else if (BaseType == ARegisterType.Int)
{
return new ARegister(Bit & 0x1f, ARegisterType.Flag);
}
else
{
throw new ArgumentOutOfRangeException(nameof(Bit));
}
}
public static bool IsRegIndex(int Index)
{
return Index >= 0 && Index < 32;
}
}
}
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