| public BranchIfNull ( ILLabel label ) : void | ||
| label | ILLabel | The label to branch to. |
| return | void | |
/// <summary>
/// Pops the value on the stack, converts it from one type to another, then pushes the
/// result onto the stack. Undefined is converted to the given default value.
/// </summary>
/// <param name="generator"> The IL generator. </param>
/// <param name="fromType"> The type to convert from. </param>
/// <param name="targetParameter"> The type to convert to and the default value, if there is one. </param>
private static void EmitTypeConversion(ILGenerator generator, Type fromType, BinderArgument argument)
{
// Emit either the default value if there is one, otherwise emit "undefined".
if (argument.HasDefaultValue)
{
// Check if the input value is undefined.
var elseClause = generator.CreateLabel();
generator.Duplicate();
generator.BranchIfNull(elseClause);
generator.Duplicate();
generator.LoadField(ReflectionHelpers.Undefined_Value);
generator.CompareEqual();
generator.BranchIfTrue(elseClause);
// Convert as per normal.
EmitTypeConversion(generator, fromType, argument.Type);
// Jump to the end.
var endOfIf = generator.CreateLabel();
generator.Branch(endOfIf);
generator.DefineLabelPosition(elseClause);
// Pop the existing value and emit the default value.
generator.Pop();
EmitUndefined(generator, argument);
// Define the end of the block.
generator.DefineLabelPosition(endOfIf);
}
else
{
// Convert as per normal.
EmitTypeConversion(generator, fromType, argument.Type);
}
}
/// <summary>
/// Pops the value on the stack, converts it from one type to another, then pushes the
/// result onto the stack. Undefined is converted to the given default value.
/// </summary>
/// <param name="generator"> The IL generator. </param>
/// <param name="fromType"> The type to convert from. </param>
/// <param name="targetParameter"> The type to convert to and the default value, if there is one. </param>
private static void EmitTypeConversion(ILGenerator generator, Type fromType, BinderArgument argument)
{
// Emit either the default value if there is one, otherwise emit "undefined".
if (argument.HasDefaultValue)
{
// Check if the input value is undefined.
var elseClause = generator.CreateLabel();
generator.Duplicate();
generator.BranchIfNull(elseClause);
generator.Duplicate();
generator.LoadField(ReflectionHelpers.Undefined_Value);
generator.CompareEqual();
generator.BranchIfTrue(elseClause);
// Convert as per normal.
EmitTypeConversion(generator, fromType, argument.Type);
// Jump to the end.
var endOfIf = generator.CreateLabel();
generator.Branch(endOfIf);
generator.DefineLabelPosition(elseClause);
// Pop the existing value and emit the default value.
generator.Pop();
EmitUndefined(generator, argument);
// Define the end of the block.
generator.DefineLabelPosition(endOfIf);
}
else
{
// Convert as per normal.
EmitTypeConversion(generator, fromType, argument.Type);
}
}
