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LoadConstants.cs
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LoadConstants.cs
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using System;
using System.Reflection.Emit;
using JetBrains.Annotations;
namespace ILGeneratorExtensions
{
/// <summary>
/// Contains extension methods for loading constant values onto the stack
/// </summary>
public static class LoadConstants
{
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, Int32 value)
{
switch (value)
{
case -1:
return generator.FluentEmit(OpCodes.Ldc_I4_M1);
case 0:
return generator.FluentEmit(OpCodes.Ldc_I4_0);
case 1:
return generator.FluentEmit(OpCodes.Ldc_I4_1);
case 2:
return generator.FluentEmit(OpCodes.Ldc_I4_2);
case 3:
return generator.FluentEmit(OpCodes.Ldc_I4_3);
case 4:
return generator.FluentEmit(OpCodes.Ldc_I4_4);
case 5:
return generator.FluentEmit(OpCodes.Ldc_I4_5);
case 6:
return generator.FluentEmit(OpCodes.Ldc_I4_6);
case 7:
return generator.FluentEmit(OpCodes.Ldc_I4_7);
case 8:
return generator.FluentEmit(OpCodes.Ldc_I4_8);
default:
return value <= 127 && value >= -128
? generator.FluentEmit(OpCodes.Ldc_I4_S, value)
: generator.FluentEmit(OpCodes.Ldc_I4, value);
}
}
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, UInt32 value)
{
switch (value)
{
case 0:
return generator.FluentEmit(OpCodes.Ldc_I4_0);
case 1:
return generator.FluentEmit(OpCodes.Ldc_I4_1);
case 2:
return generator.FluentEmit(OpCodes.Ldc_I4_2);
case 3:
return generator.FluentEmit(OpCodes.Ldc_I4_3);
case 4:
return generator.FluentEmit(OpCodes.Ldc_I4_4);
case 5:
return generator.FluentEmit(OpCodes.Ldc_I4_5);
case 6:
return generator.FluentEmit(OpCodes.Ldc_I4_6);
case 7:
return generator.FluentEmit(OpCodes.Ldc_I4_7);
case 8:
return generator.FluentEmit(OpCodes.Ldc_I4_8);
default:
return value <= 127
? generator.FluentEmit(OpCodes.Ldc_I4_S, value)
: generator.FluentEmit(OpCodes.Ldc_I4, value);
}
}
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, long value)
{
if (value <= int.MaxValue && value >= int.MinValue)
{
return generator.LoadConstant((int)value)
.ConvertToInt64();
}
else
{
return generator.FluentEmit(OpCodes.Ldc_I8, value);
}
}
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, ulong value)
{
if (value <= uint.MaxValue)
{
return generator.LoadConstant((uint)value)
.ConvertToUInt64();
}
else
{
return generator.FluentEmit(OpCodes.Ldc_I8, value);
}
}
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, float value) => generator.FluentEmit(OpCodes.Ldc_R4, value);
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, double value) => generator.FluentEmit(OpCodes.Ldc_R8, value);
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, bool value) => generator.LoadConstant(value ? 1 : 0);
/// <summary>
/// Pushes the given value onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="value">The value to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadConstant(this ILGenerator generator, char value) => generator.LoadConstant((int) value);
/// <summary>
/// Pushes the null reference onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
[PublicAPI]
public static ILGenerator LoadNull(this ILGenerator generator) => generator.FluentEmit(OpCodes.Ldnull);
/// <summary>
/// Pushes the given string onto the evaluation stack
/// </summary>
/// <param name="generator">The <see cref="T:System.Reflection.Emit.ILGenerator" /> to emit instructions from</param>
/// <param name="str">The string to push onto the evaluation stack</param>
[PublicAPI]
public static ILGenerator LoadString(this ILGenerator generator, string str) => generator.FluentEmit(OpCodes.Ldstr, str);
}
}