public Expression StoreThis(Expression value)
{
// 'this' is the first field of the root closure object (by convention)
return(Parent != null
? Parent.StoreThis(value)
: new StoreField(Source.Unknown, Expression, Type.Fields[0], value));
}
Closure CreateClosure(Closure parent, HashSet <Variable> locals)
{
if (parent != null && locals.Count == 0)
{
return(parent);
}
var type = new ClassType(
Source.Unknown,
Function.DeclaringType,
Function.Name + " lambda closure",
Modifiers.Private | Modifiers.Generated,
Function.DeclaringType.GetUniqueIdentifier(Function.Name + "_$closure"));
type.SetBase(Essentials.Object);
var constrBody = new Scope(
Source.Unknown,
new CallConstructor(Source.Unknown, Essentials.Object.TryGetConstructor()));
type.Constructors.Add(
new Constructor(
Source.Unknown,
type,
"",
Modifiers.Public | Modifiers.Generated,
ParameterList.Empty,
constrBody));
Function.DeclaringType.NestedTypes.Add(type);
_generatedTypes.Add(type);
var decl = new VariableDeclaration(
Source.Unknown,
Function,
Function.DeclaringType.GetUniqueIdentifier("generated_closure"),
type,
optionalValue: ILFactory.NewObject(type));
var statements = new List <Statement>();
statements.Add(decl);
var result = new Closure(type, statements, new LoadLocal(Source.Unknown, decl.Variable), parent);
// The root closure gets 'this' and the params
if (parent == null)
{
if (_closureVars.This)
{
var field = new Field(
Source.Unknown,
type,
type.GetUniqueIdentifier("self"),
"",
Modifiers.Public | Modifiers.Generated,
0,
Function.DeclaringType);
type.Fields.Add(field);
statements.Add(result.StoreThis(new This(Function.DeclaringType)));
}
foreach (var p in _closureVars.Params)
{
var field = new Field(
p.Source,
type,
type.GetUniqueIdentifier(p.Name),
"",
Modifiers.Public | Modifiers.Generated,
0,
p.Type);
type.Fields.Add(field);
result.ParameterFields[p] = field;
statements.Add(result.Store(p, new LoadArgument(Source.Unknown, Function, ParamIndex(p))));
}
}
// Non-root closures get a parent field for the parent closure
else
{
type.Fields.Add(
new Field(
Source.Unknown,
type,
type.GetUniqueIdentifier("parent"),
"",
Modifiers.Public | Modifiers.Generated,
0,
parent.Type));
statements.Add(result.StoreParent(parent.Expression));
}
foreach (var v in locals)
{
var field = new Field(
v.Source,
type,
type.GetUniqueIdentifier(v.Name),
"",
Modifiers.Public | Modifiers.Generated,
0,
v.ValueType);
type.Fields.Add(field);
result.VariableFields[v] = field;
}
return(result);
}