public Frame(List<Symbol> names)
{
Link = null;
Names = names ?? new List<Symbol>();
Values = null;
}
public Frame(Frame template, List<object> args)
{
Link = template.Link;
Names = template.Names;
Values = args;
}
public FrameAndScope()
{
Frame = new Frame();
Scope = new AnalysisScope();
Scope.IsFileScope = true;
Scope.IsBlockScope = true;
}
public static ThreadContextState SaveStackAndFrameWith(Frame frame, Cons form)
{
// used by compiler generated code
return CurrentThreadContext.SaveStackAndFrame(frame, form);
}
public static AnalysisScope ReconstructAnalysisScope(Frame context, AnalysisScope consoleScope = null)
{
if (consoleScope == null)
{
consoleScope = new AnalysisScope();
}
var stack = new Stack<AnalysisScope>();
stack.Push(consoleScope);
var scope = consoleScope;
scope.Names = null;
for (var frame = context; frame != null; frame = frame.Link)
{
if (frame.Names == null)
{
continue;
}
if (scope == null)
{
scope = new AnalysisScope();
stack.Push(scope);
}
scope.Names = new List<Symbol>();
foreach (var key in frame.Names)
{
scope.DefineFrameLocal(key, ScopeFlags.All);
}
scope = null;
}
scope = null;
while (stack.Count > 0)
{
var top = stack.Pop();
top.Parent = scope;
scope = top;
}
return scope;
}
public ThreadContextState SaveStackAndFrame(Frame frame = null, Cons form = null)
{
var saved = new ThreadContextState();
saved.EvaluationStack = EvaluationStack;
saved.SpecialStack = SpecialStack;
saved.Frame = Frame;
saved.NestingDepth = NestingDepth;
++NestingDepth;
if (NestingDepth == 10000)
{
Debugger.Break();
}
if (frame != null)
{
Frame = new Frame(frame, null);
Frame.Link = saved.Frame;
}
if (form != null)
{
EvaluationStack = Runtime.MakeCons(form, EvaluationStack);
}
return saved;
}
public static Expression WrapEvaluationStack(Expression code, Frame frame = null, Cons form = null)
{
// For function, try and loop: anything that has a non-local exit method.
var saved = Expression.Parameter(typeof(ThreadContextState), "saved");
var result = Expression.Parameter(typeof(object), "result");
var index = Expression.Parameter(typeof(int), "index");
var exprs = new List<Expression>();
exprs.Add(Expression.Assign(saved, CallRuntime(SaveStackAndFrameWithMethod,
Expression.Constant(frame, typeof(Frame)),
Expression.Constant(form, typeof(Cons)))));
//if ( form != null )
//{
// exprs.Add( Expression.Assign( index, CallRuntime( LogBeginCallMethod, Expression.Constant( form ) ) ) );
//}
exprs.Add(Expression.Assign(result, code));
//if ( form != null )
//{
// exprs.Add( CallRuntime( LogEndCallMethod, index ) );
//}
exprs.Add(CallRuntime(RestoreStackAndFrameMethod, saved));
exprs.Add(result);
return Expression.Block
(
typeof(object),
new[] { saved, result, index },
exprs
);
}