private static void LoadDouble(this ILGenerator ilGenerator, double value)
{
Assumes.NotNull(ilGenerator);
ilGenerator.Emit(OpCodes.Ldc_R8, value);
}
/// Generates the code that loads the supplied value on the stack
/// This is not as simple as it seems, as different instructions need to be generated depending
/// on its type.
/// We support:
/// 1. All primitive types
/// 2. Strings
/// 3. Enums
/// 4. typeofs
/// 5. nulls
/// 6. Enumerables
/// 7. Delegates on static functions or any of the above
/// Everything else cannot be represented as literals
/// <param name="ilGenerator"></param>
/// <param name="item"></param>
/// <param name="key"></param>
/// <param name="value"></param>
/// <returns></returns>
public static void LoadValue(this ILGenerator ilGenerator, object value)
{
Assumes.NotNull(ilGenerator);
//
// Get nulls out of the way - they are basically typeless, so we just load null
//
if (value == null)
{
ilGenerator.LoadNull();
return;
}
//
// Prepare for literal loading - decide whether we should box, and handle enums properly
//
Type valueType = value.GetType();
object rawValue = value;
if (valueType.IsEnum)
{
// enums are special - we need to load the underlying constant on the stack
rawValue = Convert.ChangeType(value, Enum.GetUnderlyingType(valueType), null);
valueType = rawValue.GetType();
}
//
// Generate IL depending on the valueType - this is messier than it should ever be, but sadly necessary
//
if (valueType == GenerationServices.StringType)
{
// we need to check for strings before enumerables, because strings are IEnumerable<char>
ilGenerator.LoadString((string)rawValue);
}
else if (GenerationServices.TypeType.IsAssignableFrom(valueType))
{
ilGenerator.LoadTypeOf((Type)rawValue);
}
else if (GenerationServices.IEnumerableType.IsAssignableFrom(valueType))
{
// NOTE : strings and dictionaries are also enumerables, but we have already handled those
ilGenerator.LoadEnumerable((IEnumerable)rawValue);
}
else if (
(valueType == GenerationServices.CharType) ||
(valueType == GenerationServices.BooleanType) ||
(valueType == GenerationServices.ByteType) ||
(valueType == GenerationServices.SByteType) ||
(valueType == GenerationServices.Int16Type) ||
(valueType == GenerationServices.UInt16Type) ||
(valueType == GenerationServices.Int32Type)
)
{
// NOTE : Everything that is 32 bit or less uses ldc.i4. We need to pass int32, even if the actual types is shorter - this is IL memory model
// direct casting to (int) won't work, because the value is boxed, thus we need to use Convert.
// Sadly, this will not work for all cases - namely large uint32 - because they can't semantically fit into 32 signed bits
// We have a special case for that next
ilGenerator.LoadInt((int)Convert.ChangeType(rawValue, typeof(int), CultureInfo.InvariantCulture));
}
else if (valueType == GenerationServices.UInt32Type)
{
// NOTE : This one is a bit tricky. Ldc.I4 takes an Int32 as an argument, although it really treats it as a 32bit number
// That said, some UInt32 values are larger that Int32.MaxValue, so the Convert call above will fail, which is why
// we need to treat this case individually and cast to uint, and then - unchecked - to int.
ilGenerator.LoadInt(unchecked ((int)((uint)rawValue)));
}
else if (valueType == GenerationServices.Int64Type)
{
ilGenerator.LoadLong((long)rawValue);
}
else if (valueType == GenerationServices.UInt64Type)
{
// NOTE : This one is a bit tricky. Ldc.I8 takes an Int64 as an argument, although it really treats it as a 64bit number
// That said, some UInt64 values are larger that Int64.MaxValue, so the direct case we use above (or Convert, for that matter)will fail, which is why
// we need to treat this case individually and cast to ulong, and then - unchecked - to long.
ilGenerator.LoadLong(unchecked ((long)((ulong)rawValue)));
}
else if (valueType == GenerationServices.SingleType)
{
ilGenerator.LoadFloat((float)rawValue);
}
else if (valueType == GenerationServices.DoubleType)
{
ilGenerator.LoadDouble((double)rawValue);
}
else
{
throw new InvalidOperationException(
string.Format(CultureInfo.CurrentCulture, Strings.InvalidMetadataValue, value.GetType().FullName));
}
}
private static void LoadLong(this ILGenerator ilGenerator, long value)
{
Assumes.NotNull(ilGenerator);
ilGenerator.Emit(OpCodes.Ldc_I8, value);
}
private static void LoadFloat(this ILGenerator ilGenerator, float value)
{
Assumes.NotNull(ilGenerator);
ilGenerator.Emit(OpCodes.Ldc_R4, value);
}
private static void LoadInt(this ILGenerator ilGenerator, int value)
{
Assumes.NotNull(ilGenerator);
ilGenerator.Emit(OpCodes.Ldc_I4, value);
}
public void NotNullOfT1T2T3_ValueAsValue1ArgumentAndValue2ArgumentAndValue3Argument_ShouldNotThrow()
{
Assumes.NotNull <string, string, string>("Value", "Value", "Value");
}
public void NotNullOfT_ValueAsValueArgument_ShouldNotThrow()
{
Assumes.NotNull <string>("Value");
}
internal static void NotNullOrEmpty <T>(T[] values)
{
Assumes.NotNull(values);
Assumes.IsTrue(values.Length > 0);
}
public static string GetDisplayName(Type declaringType, string name)
{
Assumes.NotNull(declaringType);
return(declaringType.GetDisplayName() + "." + name);
}
