private bool TryGetEnvironmentReference(Name name, out EnvironmentReference er)
{
Binding binding;
if (TryGetBinding(name, out binding))
{
Debug.Assert(binding.IsBound);
Debug.Assert(environment.ContainsKey(name));
er = environment[name];
return(true);
}
er = null;
return(false);
}
public override Slot GetOrMakeSlot(Name name, Type type)
{
EnvironmentReference es = en.GetOrMakeReference(name, type);
return(es.CreateSlot(instance));
}
public override Slot GetSlot(Name name)
{
EnvironmentReference es = en.GetReference(name);
return(es.CreateSlot(instance));
}
protected Slot CreateEnvironment(CodeGen cg)
{
// Get the environment size
int size = CalculateEnvironmentSize();
// Create the array for the names
Slot namesSlot = cg.GetLocalTmp(typeof(SymbolId[]));
cg.EmitInt(size - tempsCount);
cg.Emit(System.Reflection.Emit.OpCodes.Newarr, typeof(SymbolId));
namesSlot.EmitSet(cg);
// Find the right environment type
ConstructorInfo ctor;
EnvironmentFactory esf;
Type envType = GetEnvironmentType(size, cg, out ctor, out esf);
// Emit the static link for the environment constructor
cg.EmitStaticLinkOrNull();
cg.EmitCallerContext();
// Emit the names array for the environment constructor
namesSlot.EmitGet(cg);
cg.EmitNew(ctor);
// Store the environment reference in the local
Slot environmentSlot = cg.GetFrameSlot(envType);
environmentSlot.EmitSet(cg);
// Remember the environment factory for parent access
environmentFactory = esf;
// Create environment references
environment = new Dictionary <Name, EnvironmentReference>();
foreach (KeyValuePair <Name, Binding> kv in names)
{
if (!kv.Value.IsEnvironment)
{
continue;
}
Name name = kv.Key;
EnvironmentReference er = esf.MakeEnvironmentReference(name);
Slot slot = er.CreateSlot(environmentSlot);
Slot current;
if (cg.Names.Slots.TryGetValue(name, out current))
{
slot.EmitSet(cg, current);
}
else
{
slot.EmitSetUninitialized(cg, name);
}
// Set the name into the array
namesSlot.EmitGet(cg);
cg.EmitInt(er.Index);
cg.Emit(OpCodes.Ldelema, typeof(SymbolId));
cg.EmitSymbolIdInt(name.GetString());
cg.Emit(OpCodes.Call, typeof(SymbolId).GetConstructor(new Type[] { typeof(int) }));
// The full slot goes to the codegen's namespace
cg.Names.SetSlot(name, slot);
// Environment reference goes to the environment
environment[name] = er;
}
return(environmentSlot);
}