private MSAst.LambdaExpression CreateGeneratorFactoryLambda(MSAst.Expression generatorBody)
{
MSAst.Expression body = Ast.Block(
Ast.Call(
typeof(RuntimeOps).GetMethod("ReplaceLiftedLocals"),
_frame,
Ast.RuntimeVariables(_pendingLocals)
),
generatorBody
);
if (_retVal != null)
{
body = Ast.Block(
Ast.Assign(_retVal, body),
AstUtils.YieldReturn(
_generatorLabelTarget, Ast.Convert(_retVal, typeof(object))
)
);
}
List <Type> argTypes = new List <Type>();
for (int i = 0; i < _variableInfos.Count; i++)
{
VariableInfo varInfo = _variableInfos[i];
if (varInfo.IsParameter)
{
argTypes.Add(varInfo.VariableType);
}
}
if (body.Type != typeof(void))
{
body = AstUtils.Void(body);
}
return(AstUtils.GeneratorLambda(
InvokeTargets.GetGeneratorFactoryTarget(argTypes.ToArray()),
_generatorLabelTarget,
Ast.Block(
_generatorVars,
body
),
_alias,
_generatorParams));
}
/// <summary>
/// Creates the generator LambdaExpression from the builder.
/// After this operation, the builder can no longer be used to create other instances.
/// </summary>
/// <returns>New LambdaExpression instance.</returns>
public LambdaExpression MakeGenerator(LabelTarget label, Type lambdaType)
{
Validate();
EnsureSignature(lambdaType);
LambdaExpression lambda = Utils.GeneratorLambda(
lambdaType,
label,
MakeBody(),
_name + "$" + Interlocked.Increment(ref _lambdaId),
_params
);
// The builder is now completed
_completed = true;
return(lambda);
}