public override void Evaluate(ComputationContext ctx)
{
if (this.Evaluation == null)
{
FunctionDefinition func = this.EnclosingScope <FunctionDefinition>();
if (func == null)
{
ctx.ErrorManager.AddError(ErrorCode.ReturnOutsideFunction, this);
}
else
{
if (func.IsResultTypeNameInfered)
{
if (this.Expr == null)
{
func.AddResultTypeCandidate(ctx.Env.UnitType.InstanceOf);
}
else
{
func.AddResultTypeCandidate(this.Expr.Evaluation.Components);
}
}
else
{
IEntityInstance func_result = func.ResultParameter.TypeName.Evaluation.Components;
if (this.Expr == null)
{
if (!ctx.Env.IsUnitType(func_result))
{
ctx.ErrorManager.AddError(ErrorCode.EmptyReturn, this);
}
}
else
{
this.DataTransfer(ctx, ref this.expr, func_result);
}
}
}
// https://stackoverflow.com/questions/7563981/why-isnt-g-tail-call-optimizing-while-gcc-is
// http://www.drdobbs.com/tackling-c-tail-calls/184401756
if (this.Expr is FunctionCall call && call.IsRecall() &&
!func.Parameters.Any(it => ctx.Env.IsReferenceOfType(it.TypeName.Evaluation.Components)))
{
this.TailCallOptimization = call;
}
this.Evaluation = ctx.Env.UnitEvaluation;
}
}