private ScopeStructure <int> ExecuteLayoutPass <T>(IExpression <int> expression, ScopeStructure <int> scope, T output)
{
switch (expression.Type)
{
case EAExpressionType.Scope:
{
ScopeStructure <int> newScope = new ScopeStructure <int> (scope);
scopeStructures [(Scope <int>)expression] = newScope;
foreach (IExpression <int> child in expression.GetChildren())
{
ExecuteLayoutPass(child, newScope, output);
}
break;
}
case EAExpressionType.Code:
{
Code <int> code = expression as Code <int>;
if (code.IsEmpty || HandleBuiltInCodeLayout(code, scope))
{
break;
}
if (code.CodeName.Name == "ASMC" && code.Parameters[0].ToString() != "" && !System.Text.RegularExpressions.Regex.IsMatch(code.Parameters[0].ToString(), @"\A\b(0[xX])?[0-9a-fA-F]+\b\Z"))
{
scope.RegisterASMCLabel(code.Parameters[0].ToString());
}
Types.Type[] sig = ((IEnumerable <IExpression <int> >)code.Parameters).Select(new Func <IExpression <int>, Types.Type> (Types.Type.GetType <int>)).ToArray();
CanCauseError <ICodeTemplate> templateError = this.storer.FindTemplate(code.CodeName.Name, sig);
if (templateError.CausedError)
{
AddError <int, ICodeTemplate> ((IExpression <int>)code, templateError);
break;
}
ICodeTemplate template = templateError.Result;
// Checking alignment
if (currentOffset % template.OffsetMod != 0)
{
this.AddError <int> ((IExpression <int>)code, "Code {0}'s offset {1} is not divisible by {2}", (object)code.CodeName.Name, (object)this.currentOffset.ToHexString("$"), (object)template.OffsetMod);
}
// TODO: maybe we want to store the template somewhere to lookup for later?
// May or may not be faster than computing it again in the write pass
this.currentOffset += template.GetLengthBytes(((IEnumerable <IExpression <int> >)code.Parameters).ToArray());
break;
}
case EAExpressionType.Labeled:
{
// record label names
scope.SetLocalLabelAddress(((LabelExpression <int>)expression).LabelName, currentOffset);
CanCauseError err = scope.AddNewSymbol(((LabelExpression <int>)expression).LabelName, new ValueExpression <int> (this.currentOffset, new FilePosition()));
if (err.CausedError)
{
AddWarning(expression, err.ErrorMessage);
}
break;
}
case EAExpressionType.Assignment:
{
Assignment <int> assingment = (Assignment <int>)expression;
CanCauseError <int> value = Folding.Fold(assingment.Value, x => this.GetSymbolValue(scope, x));
CanCauseError err = null;
if (value.CausedError)
{
err = scope.AddNewSymbol(assingment.Name, assingment.Value);
}
else
{
err = scope.AddNewSymbol(assingment.Name, new ValueExpression <int> (value.Result, new FilePosition()));
}
if (err.CausedError)
{
AddWarning(expression, err.ErrorMessage);
}
break;
}
case EAExpressionType.RawData:
{
RawData <int> rawData = (RawData <int>)expression;
this.currentOffset += rawData.Data.Length;
break;
}
default:
throw new ArgumentException("Badly formed tree.");
}
// DeclareExternASMCLabels<T>(scope, output);
return(scope);
}