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using ChocolArm64.IntermediateRepresentation;
using ChocolArm64.State;
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Intrinsics;
using static ChocolArm64.State.RegisterConsts;
namespace ChocolArm64.Translation
{
class TranslatedSubBuilder
{
private ExecutionMode _mode;
private bool _isComplete;
private Dictionary<Register, int> _locals;
private RegisterUsage _regUsage;
public TranslatedSubBuilder(ExecutionMode mode, bool isComplete = false)
{
_mode = mode;
_isComplete = isComplete;
}
public TranslatedSub Build(BasicBlock[] blocks, string name, TranslationTier tier, bool rejit = true)
{
_regUsage = new RegisterUsage(blocks[0], blocks.Length);
DynamicMethod method = new DynamicMethod(name, typeof(long), TranslatedSub.FixedArgTypes);
TranslatedSub subroutine = new TranslatedSub(method, tier, rejit);
_locals = new Dictionary<Register, int>();
Dictionary<ILLabel, Label> labels = new Dictionary<ILLabel, Label>();
ILGenerator generator = method.GetILGenerator();
Label GetLabel(ILLabel label)
{
if (!labels.TryGetValue(label, out Label ilLabel))
{
ilLabel = generator.DefineLabel();
labels.Add(label, ilLabel);
}
return ilLabel;
}
foreach (BasicBlock block in blocks)
{
for (int index = 0; index < block.Count; index++)
{
Operation operation = block.GetOperation(index);
switch (operation.Type)
{
case OperationType.Call:
generator.Emit(OpCodes.Call, operation.GetArg<MethodInfo>(0));
break;
case OperationType.CallVirtual:
generator.Emit(OpCodes.Callvirt, operation.GetArg<MethodInfo>(0));
break;
case OperationType.IL:
generator.Emit(operation.GetArg<OpCode>(0));
break;
case OperationType.ILBranch:
generator.Emit(operation.GetArg<OpCode>(0), GetLabel(operation.GetArg<ILLabel>(1)));
break;
case OperationType.LoadArgument:
generator.EmitLdarg(operation.GetArg<int>(0));
break;
case OperationType.LoadConstant:
EmitLoadConstant(generator, operation.GetArg(0));
break;
case OperationType.LoadContext:
EmitLoadContext(generator, operation.Parent);
break;
case OperationType.LoadField:
generator.Emit(OpCodes.Ldfld, operation.GetArg<FieldInfo>(0));
break;
case OperationType.LoadLocal:
EmitLoadLocal(
generator,
operation.GetArg<int>(0),
operation.GetArg<RegisterType>(1),
operation.GetArg<RegisterSize>(2));
break;
case OperationType.MarkLabel:
generator.MarkLabel(GetLabel(operation.GetArg<ILLabel>(0)));
break;
case OperationType.StoreContext:
EmitStoreContext(generator, operation.Parent);
break;
case OperationType.StoreLocal:
EmitStoreLocal(
generator,
operation.GetArg<int>(0),
operation.GetArg<RegisterType>(1),
operation.GetArg<RegisterSize>(2));
break;
}
}
}
subroutine.PrepareMethod();
return subroutine;
}
private static void EmitLoadConstant(ILGenerator generator, object value)
{
switch (value)
{
case int valI4: generator.EmitLdc_I4(valI4); break;
case long valI8: generator.Emit(OpCodes.Ldc_I8, valI8); break;
case float valR4: generator.Emit(OpCodes.Ldc_R4, valR4); break;
case double valR8: generator.Emit(OpCodes.Ldc_R8, valR8); break;
}
}
private void EmitLoadContext(ILGenerator generator, BasicBlock block)
{
RegisterMask inputs = _regUsage.GetInputs(block);
long intInputs = inputs.IntMask;
long vecInputs = inputs.VecMask;
if (Optimizations.AssumeStrictAbiCompliance && _isComplete)
{
intInputs = RegisterUsage.ClearCallerSavedIntRegs(intInputs, _mode);
vecInputs = RegisterUsage.ClearCallerSavedVecRegs(vecInputs, _mode);
}
LoadLocals(generator, intInputs, RegisterType.Int);
LoadLocals(generator, vecInputs, RegisterType.Vector);
}
private void LoadLocals(ILGenerator generator, long inputs, RegisterType baseType)
{
for (int bit = 0; bit < 64; bit++)
{
long mask = 1L << bit;
if ((inputs & mask) != 0)
{
Register reg = GetRegFromBit(bit, baseType);
generator.EmitLdarg(TranslatedSub.StateArgIdx);
generator.Emit(OpCodes.Ldfld, reg.GetField());
generator.EmitStloc(GetLocalIndex(generator, reg));
}
}
}
private void EmitStoreContext(ILGenerator generator, BasicBlock block)
{
RegisterMask outputs = _regUsage.GetOutputs(block);
long intOutputs = outputs.IntMask;
long vecOutputs = outputs.VecMask;
if (Optimizations.AssumeStrictAbiCompliance && _isComplete)
{
intOutputs = RegisterUsage.ClearCallerSavedIntRegs(intOutputs, _mode);
vecOutputs = RegisterUsage.ClearCallerSavedVecRegs(vecOutputs, _mode);
}
StoreLocals(generator, intOutputs, RegisterType.Int);
StoreLocals(generator, vecOutputs, RegisterType.Vector);
}
private void StoreLocals(ILGenerator generator, long outputs, RegisterType baseType)
{
for (int bit = 0; bit < 64; bit++)
{
long mask = 1L << bit;
if ((outputs & mask) != 0)
{
Register reg = GetRegFromBit(bit, baseType);
generator.EmitLdarg(TranslatedSub.StateArgIdx);
generator.EmitLdloc(GetLocalIndex(generator, reg));
generator.Emit(OpCodes.Stfld, reg.GetField());
}
}
}
private void EmitLoadLocal(ILGenerator generator, int index, RegisterType type, RegisterSize size)
{
Register reg = new Register(index, type);
generator.EmitLdloc(GetLocalIndex(generator, reg));
if (type == RegisterType.Int && size == RegisterSize.Int32)
{
generator.Emit(OpCodes.Conv_U4);
}
}
private void EmitStoreLocal(ILGenerator generator, int index, RegisterType type, RegisterSize size)
{
Register reg = new Register(index, type);
if (type == RegisterType.Int && size == RegisterSize.Int32)
{
generator.Emit(OpCodes.Conv_U8);
}
generator.EmitStloc(GetLocalIndex(generator, reg));
}
private int GetLocalIndex(ILGenerator generator, Register reg)
{
if (!_locals.TryGetValue(reg, out int index))
{
generator.DeclareLocal(GetFieldType(reg.Type));
index = _locals.Count;
_locals.Add(reg, index);
}
return index;
}
private static Type GetFieldType(RegisterType regType)
{
switch (regType)
{
case RegisterType.Flag: return typeof(bool);
case RegisterType.Int: return typeof(ulong);
case RegisterType.Vector: return typeof(Vector128<float>);
}
throw new ArgumentException(nameof(regType));
}
private static Register GetRegFromBit(int bit, RegisterType baseType)
{
if (bit < RegsCount)
{
return new Register(bit, baseType);
}
else if (baseType == RegisterType.Int)
{
return new Register(bit & RegsMask, RegisterType.Flag);
}
else
{
throw new ArgumentOutOfRangeException(nameof(bit));
}
}
}
}
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