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using System;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
namespace Utf8Json.Internal.Emit
{
internal struct ArgumentField
{
readonly int i;
readonly bool @ref;
readonly ILGenerator il;
public ArgumentField(ILGenerator il, int i, bool @ref = false)
{
this.il = il;
this.i = i;
this.@ref = @ref;
}
public ArgumentField(ILGenerator il, int i, Type type)
{
this.il = il;
this.i = i;
this.@ref = (type.IsClass || type.IsInterface || type.IsAbstract) ? false : true;
}
public void EmitLoad()
{
if (@ref)
{
il.EmitLdarga(i);
}
else
{
il.EmitLdarg(i);
}
}
public void EmitStore()
{
il.EmitStarg(i);
}
}
/// <summary>
/// Provides optimized generation code and helpers.
/// </summary>
internal static class ILGeneratorExtensions
{
/// <summary>
/// Loads the local variable at a specific index onto the evaluation stack.
/// </summary>
public static void EmitLdloc(this ILGenerator il, int index)
{
switch (index)
{
case 0:
il.Emit(OpCodes.Ldloc_0);
break;
case 1:
il.Emit(OpCodes.Ldloc_1);
break;
case 2:
il.Emit(OpCodes.Ldloc_2);
break;
case 3:
il.Emit(OpCodes.Ldloc_3);
break;
default:
if (index <= 255)
{
il.Emit(OpCodes.Ldloc_S, (byte)index);
}
else
{
il.Emit(OpCodes.Ldloc, (short)index);
}
break;
}
}
public static void EmitLdloc(this ILGenerator il, LocalBuilder local)
{
EmitLdloc(il, local.LocalIndex);
}
/// <summary>
/// Pops the current value from the top of the evaluation stack and stores it in a the local variable list at a specified index.
/// </summary>
public static void EmitStloc(this ILGenerator il, int index)
{
switch (index)
{
case 0:
il.Emit(OpCodes.Stloc_0);
break;
case 1:
il.Emit(OpCodes.Stloc_1);
break;
case 2:
il.Emit(OpCodes.Stloc_2);
break;
case 3:
il.Emit(OpCodes.Stloc_3);
break;
default:
if (index <= 255)
{
il.Emit(OpCodes.Stloc_S, (byte)index);
}
else
{
il.Emit(OpCodes.Stloc, (short)index);
}
break;
}
}
public static void EmitStloc(this ILGenerator il, LocalBuilder local)
{
EmitStloc(il, local.LocalIndex);
}
/// <summary>
/// Loads the address of the local variable at a specific index onto the evaluation statck.
/// </summary>
public static void EmitLdloca(this ILGenerator il, int index)
{
if (index <= 255)
{
il.Emit(OpCodes.Ldloca_S, (byte)index);
}
else
{
il.Emit(OpCodes.Ldloca, (short)index);
}
}
public static void EmitLdloca(this ILGenerator il, LocalBuilder local)
{
EmitLdloca(il, local.LocalIndex);
}
public static void EmitTrue(this ILGenerator il)
{
EmitBoolean(il, true);
}
public static void EmitFalse(this ILGenerator il)
{
EmitBoolean(il, false);
}
public static void EmitBoolean(this ILGenerator il, bool value)
{
EmitLdc_I4(il, value ? 1 : 0);
}
/// <summary>
/// Pushes a supplied value of type int32 onto the evaluation stack as an int32.
/// </summary>
public static void EmitLdc_I4(this ILGenerator il, int value)
{
switch (value)
{
case -1:
il.Emit(OpCodes.Ldc_I4_M1);
break;
case 0:
il.Emit(OpCodes.Ldc_I4_0);
break;
case 1:
il.Emit(OpCodes.Ldc_I4_1);
break;
case 2:
il.Emit(OpCodes.Ldc_I4_2);
break;
case 3:
il.Emit(OpCodes.Ldc_I4_3);
break;
case 4:
il.Emit(OpCodes.Ldc_I4_4);
break;
case 5:
il.Emit(OpCodes.Ldc_I4_5);
break;
case 6:
il.Emit(OpCodes.Ldc_I4_6);
break;
case 7:
il.Emit(OpCodes.Ldc_I4_7);
break;
case 8:
il.Emit(OpCodes.Ldc_I4_8);
break;
default:
if (value >= -128 && value <= 127)
{
il.Emit(OpCodes.Ldc_I4_S, (sbyte)value);
}
else
{
il.Emit(OpCodes.Ldc_I4, value);
}
break;
}
}
public static void EmitUnboxOrCast(this ILGenerator il, Type type)
{
if (type.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, type);
}
else
{
il.Emit(OpCodes.Castclass, type);
}
}
public static void EmitBoxOrDoNothing(this ILGenerator il, Type type)
{
if (type.IsValueType)
{
il.Emit(OpCodes.Box, type);
}
}
public static void EmitLdarg(this ILGenerator il, int index)
{
switch (index)
{
case 0:
il.Emit(OpCodes.Ldarg_0);
break;
case 1:
il.Emit(OpCodes.Ldarg_1);
break;
case 2:
il.Emit(OpCodes.Ldarg_2);
break;
case 3:
il.Emit(OpCodes.Ldarg_3);
break;
default:
if (index <= 255)
{
il.Emit(OpCodes.Ldarg_S, (byte)index);
}
else
{
il.Emit(OpCodes.Ldarg, index);
}
break;
}
}
public static void EmitLoadThis(this ILGenerator il)
{
EmitLdarg(il, 0);
}
public static void EmitLdarga(this ILGenerator il, int index)
{
if (index <= 255)
{
il.Emit(OpCodes.Ldarga_S, (byte)index);
}
else
{
il.Emit(OpCodes.Ldarga, index);
}
}
public static void EmitStarg(this ILGenerator il, int index)
{
if (index <= 255)
{
il.Emit(OpCodes.Starg_S, (byte)index);
}
else
{
il.Emit(OpCodes.Starg, index);
}
}
/// <summary>
/// Helper for Pop op.
/// </summary>
public static void EmitPop(this ILGenerator il, int count)
{
for (int i = 0; i < count; i++)
{
il.Emit(OpCodes.Pop);
}
}
public static void EmitCall(this ILGenerator il, MethodInfo methodInfo)
{
if (methodInfo.IsFinal || !methodInfo.IsVirtual)
{
il.Emit(OpCodes.Call, methodInfo);
}
else
{
il.Emit(OpCodes.Callvirt, methodInfo);
}
}
public static void EmitLdfld(this ILGenerator il, FieldInfo fieldInfo)
{
il.Emit(OpCodes.Ldfld, fieldInfo);
}
public static void EmitLdsfld(this ILGenerator il, FieldInfo fieldInfo)
{
il.Emit(OpCodes.Ldsfld, fieldInfo);
}
public static void EmitRet(this ILGenerator il)
{
il.Emit(OpCodes.Ret);
}
public static void EmitIntZeroReturn(this ILGenerator il)
{
il.EmitLdc_I4(0);
il.Emit(OpCodes.Ret);
}
public static void EmitNullReturn(this ILGenerator il)
{
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Ret);
}
public static void EmitULong(this ILGenerator il, ulong value)
{
il.Emit(OpCodes.Ldc_I8, unchecked((long)value));
}
public static void EmitThrowNotimplemented(this ILGenerator il)
{
il.Emit(OpCodes.Newobj, typeof(System.NotImplementedException).GetTypeInfo().DeclaredConstructors.First(x => x.GetParameters().Length == 0));
il.Emit(OpCodes.Throw);
}
/// <summary>for var i = 0, i ..., i++ </summary>
public static void EmitIncrementFor(this ILGenerator il, LocalBuilder conditionGreater, Action<LocalBuilder> emitBody)
{
var loopBegin = il.DefineLabel();
var condtionLabel = il.DefineLabel();
// var i = 0
var forI = il.DeclareLocal(typeof(int));
il.EmitLdc_I4(0);
il.EmitStloc(forI);
il.Emit(OpCodes.Br, condtionLabel);
il.MarkLabel(loopBegin);
emitBody(forI);
// i++
il.EmitLdloc(forI);
il.EmitLdc_I4(1);
il.Emit(OpCodes.Add);
il.EmitStloc(forI);
//// i < ***
il.MarkLabel(condtionLabel);
il.EmitLdloc(forI);
il.EmitLdloc(conditionGreater);
il.Emit(OpCodes.Blt, loopBegin);
}
}
}