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public static EmitValue ( |
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| generator | The IL generator. | |
| value | object | The value to emit. |
| return | void | |
/// <summary>
/// Pushes the result of converting <c>undefined</c> to the given type onto the stack.
/// </summary>
/// <param name="il"> The IL generator. </param>
/// <param name="targetParameter"> The type to convert to, and optionally a default value. </param>
private static void EmitUndefined(ILGenerator il, BinderArgument argument)
{
// Emit either the default value if there is one, otherwise emit "undefined".
if (argument.HasDefaultValue == true)
{
// Emit the default value.
EmitHelpers.EmitValue(il, argument.DefaultValue);
}
else
{
// Convert Undefined to the target type and emit.
EmitHelpers.EmitUndefined(il);
EmitTypeConversion(il, typeof(object), argument.Type);
}
}
/// <summary>
/// Gets an enumerable list of argument objects, equal in size to
/// <paramref name="argumentCount"/> while generating code to prepare those arguments for
/// a method call.
/// </summary>
/// <param name="argumentCount"> The number of arguments to return. </param>
/// <param name="generator"> The IL generator used to create an array if the method has a
/// ParamArray parameter. </param>
/// <returns> An enumerable list of argument objects. </returns>
public IEnumerable <BinderArgument> GenerateArguments(ILGenerator generator, int argumentCount)
{
if (generator == null)
{
throw new ArgumentNullException(nameof(generator));
}
int paramArrayIndex = 0;
foreach (var argument in this.GetArguments(argumentCount))
{
if (argument.IsParamArrayArgument == true)
{
if (paramArrayIndex == 0)
{
// This is the start of the ParamArray arguments.
// Create an array.
int paramArraySize = Math.Max(0, argumentCount - this.OptionalParameterCount - this.RequiredParameterCount);
generator.LoadInt32(paramArraySize);
generator.NewArray(argument.Type);
}
// Load the array and index.
generator.Duplicate();
generator.LoadInt32(paramArrayIndex++);
}
// Yield will have the side effect of generating a value.
yield return(argument);
if (argument.IsParamArrayArgument == true)
{
// Store the value in the ParamArray array.
generator.StoreArrayElement(argument.Type);
}
}
// Populate any missing optional arguments with the default value.
if (this.RequiredParameterCount + this.OptionalParameterCount - argumentCount > 0)
{
var parameters = this.GetParameters();
for (int i = 0; i < this.RequiredParameterCount + this.OptionalParameterCount - argumentCount; i++)
{
var optionalParameter = parameters[argumentCount + i];
if ((optionalParameter.Attributes & ParameterAttributes.HasDefault) == ParameterAttributes.HasDefault)
{
// Emit the default value.
EmitHelpers.EmitValue(generator, new BinderArgument(optionalParameter, 0).DefaultValue);
}
else
{
// Emit default(T).
EmitHelpers.EmitDefaultValue(generator, optionalParameter.ParameterType);
}
}
}
// Create an empty array if a ParamArray argument exists but no arguments were provided.
if (this.HasParamArray == true && paramArrayIndex == 0)
{
// Create an array.
generator.LoadInt32(0);
generator.NewArray(this.ParamArrayElementType);
}
}