public static Instruction AppendLd(this Instruction instruction, ILProcessor processor, CustomAttributeArgument argument)
{
// Tested with the following types (see ECMA-334, 24.1.3 attribute parameter types)
// bool, byte, char, double, float, int, long, sbyte, short, string, uint, ulong, ushort.
// object
// System.Type
// An enum type, provided it has public accessibility and the types in which it is nested (if any) also have public accessibility (§17.2)
// Single-dimensional arrays of the above types
TypeReference argumentType = argument.Type;
switch (argumentType.MetadataType)
{
case MetadataType.ValueType:
if (argumentType.Resolve().IsEnum == false)
{
throw new ArgumentException("Type Enum expected.", "argument");
}
// Get underlying Enum type
argumentType = argument.Type.Resolve().Fields.First(field => field.Name == "value__").FieldType;
break;
case MetadataType.Object:
return(instruction.AppendLd(processor, (CustomAttributeArgument)argument.Value));
case MetadataType.Array:
CustomAttributeArgument[] values = (CustomAttributeArgument[])argument.Value;
instruction = instruction
.AppendLdcI4(processor, values.Length)
.Append(processor.Create(OpCodes.Newarr, argument.Type.GetElementType()), processor);
TypeReference arrayType = argument.Type.GetElementType();
for (int i = 0; i < values.Length; i++)
{
instruction = instruction
.AppendDup(processor)
.AppendLdcI4(processor, i)
.AppendLd(processor, values[i]);
if (arrayType == ReferenceFinder.Weaver.ModuleDefinition.TypeSystem.Object)
{
instruction = instruction.AppendBoxIfNecessary(processor, ((CustomAttributeArgument)values[i].Value).Type);
}
else if (argumentType.Resolve().IsEnum)
{
// Get underlying Enum type
arrayType = argument.Type.Resolve().Fields.First(field => field.Name == "value__").FieldType;
}
if (arrayType.IsValueType)
{
switch (arrayType.MetadataType)
{
case MetadataType.Boolean:
case MetadataType.SByte:
case MetadataType.Byte:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_I1), processor);
break;
case MetadataType.Char:
case MetadataType.Int16:
case MetadataType.UInt16:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_I2), processor);
break;
case MetadataType.Int32:
case MetadataType.UInt32:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_I4), processor);
break;
case MetadataType.Int64:
case MetadataType.UInt64:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_I8), processor);
break;
case MetadataType.Single:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_R4), processor);
break;
case MetadataType.Double:
instruction = instruction.Append(processor.Create(OpCodes.Stelem_R8), processor);
break;
default:
throw new ArgumentException("Unrecognized array value type.", "argument");
}
}
else
{
instruction = instruction.Append(processor.Create(OpCodes.Stelem_Ref), processor);
}
}
return(instruction);
}
switch (argumentType.MetadataType)
{
case MetadataType.Boolean:
case MetadataType.SByte:
return(instruction.Append(processor.Create(OpCodes.Ldc_I4_S, Convert.ToSByte(argument.Value)), processor));
case MetadataType.Int16:
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, Convert.ToInt16(argument.Value)), processor));
case MetadataType.Int32:
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, Convert.ToInt32(argument.Value)), processor));
case MetadataType.Int64:
return(instruction.Append(processor.Create(OpCodes.Ldc_I8, Convert.ToInt64(argument.Value)), processor));
case MetadataType.Byte:
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, Convert.ToInt32(argument.Value)), processor));
case MetadataType.UInt16:
unchecked
{
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, (Int16)(UInt16)argument.Value), processor));
}
case MetadataType.Char:
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, Convert.ToChar(argument.Value)), processor));
case MetadataType.UInt32:
unchecked
{
return(instruction.Append(processor.Create(OpCodes.Ldc_I4, (Int32)(UInt32)argument.Value), processor));
}
case MetadataType.UInt64:
unchecked
{
return(instruction.Append(processor.Create(OpCodes.Ldc_I8, (Int64)(UInt64)argument.Value), processor));
}
case MetadataType.Single:
return(instruction.Append(processor.Create(OpCodes.Ldc_R4, Convert.ToSingle(argument.Value)), processor));
case MetadataType.Double:
return(instruction.Append(processor.Create(OpCodes.Ldc_R8, Convert.ToDouble(argument.Value)), processor));
case MetadataType.String:
return(instruction.Append(processor.Create(OpCodes.Ldstr, (string)argument.Value), processor));
case MetadataType.Class:
if (argumentType.Resolve().IsDefinition == false)
{
throw new ArgumentException("Type Type expected.", "argument");
}
return
(instruction
.Append(processor.Create(OpCodes.Ldtoken, (TypeReference)argument.Value), processor)
.Append(processor.Create(OpCodes.Call, ReferenceFinder.Weaver.ModuleDefinition.ImportMethod(
ReferenceFinder.SystemTypeGetTypeFromHandleMethod)), processor));
default:
throw new ArgumentException("Unrecognized attribute parameter type.", "argument");
}
}