public void Evaluate(ComputationContext ctx)
{
if (this.Evaluation == null)
{
// trap only lambdas, name reference is a call, not passing function around
// for example here trapping lambda into closure is necessary
// ((x) => x*x)()
// and here is not (regular call)
// f()
if (this.TrapLambdaClosure(ctx, ref this.callee))
{
ConvertToExplicitInvoke(ctx);
}
{
EntityInstance eval = this.Callee.Evaluation.Components.Cast <EntityInstance>();
this.Callee.DereferencedCount_LEGACY = ctx.Env.DereferencedOnce(eval, out IEntityInstance __eval, out bool via_pointer) ? 1 : 0;
this.DereferencingCount = this.Callee.DereferencedCount_LEGACY;
if (this.Callee.DereferencedCount_LEGACY > 0)
{
eval = __eval.Cast <EntityInstance>();
}
if (!(this.Name.Binding.Match.Instance.Target is FunctionDefinition) &&
eval.Target.Cast <TypeDefinition>().InvokeFunctions().Any())
{
// if we call a "closure", like my_closure() it is implicit calling "invoke"
// so make it explicit on the fly
ConvertToExplicitInvoke(ctx);
}
}
IEnumerable <EntityInstance> matches = this.Name.Binding.Matches
.Select(it =>
{
if (it.Instance.Target.IsFunction())
{
return(it.Instance);
}
else if (it.Instance.Target is Property prop)
{
return(prop.Getter?.InstanceOf?.TranslateThrough(it.Instance));
}
else
{
return(null);
}
})
.Where(it => it != null);
if (!matches.Any())
{
this.resolution = new Option <CallResolution>(null);
if (!this.Callee.Evaluation.Components.IsJoker) // do not cascade errors
{
ctx.AddError(ErrorCode.NotFunctionType, this.Callee);
}
}
else
{
IEnumerable <CallResolution> targets = matches
.Select(it => CallResolution.Create(ctx, this.Name.TemplateArguments, this,
createCallContext(ctx, this.Name, it.TargetFunction), targetFunctionInstance: it))
.Where(it => it != null)
.StoreReadOnly();
targets = targets.Where(it => it.RequiredParametersUsed()).StoreReadOnly();
targets = targets.Where(it => it.CorrectlyFormedArguments()).StoreReadOnly();
targets = targets.Where(it => it.ArgumentTypesMatchParameters(ctx)).StoreReadOnly();
if (this.RequestedOutcomeTypeName != null)
{
targets = targets.Where(it => it.OutcomeMatchesRequest(ctx)).StoreReadOnly();
}
targets = resolveOverloading(targets).StoreReadOnly();
this.resolution = new Option <CallResolution>(targets.FirstOrDefault());
if (!targets.Any())
{
ctx.AddError(ErrorCode.TargetFunctionNotFound, this);
}
else
{
if (targets.Count() > 1)
{
ctx.ErrorManager.AddError(ErrorCode.NOTEST_AmbiguousOverloadedCall, this,
targets.Select(it => it.TargetFunctionInstance.Target));
}
foreach (var group in this.Resolution.GetArgumentsMultipleTargeted())
{
// we only report second "override" because if there are more
// it is more likely user forgot to mark parameter variadic
ctx.ErrorManager.AddError(ErrorCode.ArgumentForFunctionAlreadyGiven, group.Skip(1).FirstOrDefault());
}
foreach (FunctionParameter param in this.Resolution.GetUnfulfilledVariadicParameters())
{
ctx.ErrorManager.AddError(ErrorCode.InvalidNumberVariadicArguments, this, param);
}
if (targets.Count() == 1)
{
this.Resolution.EnhanceArguments(ctx);
}
this.Resolution.SetMappings(ctx);
// filtering here is a bit shaky -- if we don't use type inference
// we have to filter by what we bind to, but if we use inference
// we use target instance (functor or function, not a variable) because only it
// is altered by type inference
if (this.Resolution.InferredTemplateArguments == null)
{
// leave only binding which was used for mapping
this.Name.Binding.Filter(it => it.IsIdentical(this.Resolution.TargetFunctionInstance));
}
else
{
NameReference this_name = this.Name;
this_name.DetachFrom(this);
this.callee = this_name.Recreate(this.Resolution.InferredTemplateArguments
.Select(it => new TemplateArgument(it)),
this.Resolution.TargetFunctionInstance, this_name.Binding.Match.IsLocal);
this.callee.AttachTo(this);
this.Callee.Evaluated(ctx, EvaluationCall.AdHocCrossJump);
if (!this.Name.Binding.HasMatch)
{
throw new Exception("We've just lost our binding, probably something wrong with template translations");
}
}
this.Evaluation = this.Resolution.Evaluation;
if (ctx.Env.IsReferenceOfType(this.Evaluation.Aggregate))
{
// basically we are saying that the outcome of the function has the lifetime
// equal to the shortest lifetime of arguments
// or local if the function has not arguments at all
Lifetime lifetime = null;
foreach (FunctionArgument arg in this.Resolution.ActualArguments)
{
// todo: we should check if the expression is not passed implictly by reference
if (arg == this.Resolution.MetaThisArgument || ctx.Env.IsReferenceOfType(arg.Evaluation.Aggregate))
{
lifetime = arg.Evaluation.Aggregate.Lifetime.Shorter(lifetime);
}
}
if (lifetime == null)
{
lifetime = Lifetime.Create(this);
}
if (this.Evaluation.Aggregate.Lifetime != lifetime)
{
this.Evaluation = EvaluationInfo.Create(
this.Evaluation.Components.Rebuild(ctx, lifetime, deep: false),
this.Evaluation.Aggregate.Build(lifetime));
}
}
}
}
if (this.Evaluation == null)
{
this.Evaluation = Environment.JokerEval;
}
foreach (IExpression arg in UserArguments)
{
arg.ValidateValueExpression(ctx);
}
}
}