/// <summary>
/// Converts the dimensional specifier to an expression.
/// </summary>
/// <param name="dimSpec">dimensional specifier to convert</param>
/// <returns>expression representing the dimensional specifier</returns>
public static Expression AsExpression(this DimSpec dimSpec)
{
switch (dimSpec.Kind)
{
case DimSpec.EKind.Index:
return(LiteralReference.CreateConstant((int)dimSpec));
case DimSpec.EKind.Range:
return(LiteralReference.CreateConstant((Range)dimSpec));
default: throw new NotImplementedException();
}
}
public override bool Rewrite(
CodeDescriptor decompilee,
MethodBase callee,
StackElement[] args,
IDecompiler stack,
IFunctionBuilder builder)
{
if (args.Length < 2)
throw new InvalidOperationException("The attribute SignalIndexer was applied to the wrong method");
LiteralReference refExpr = args[0].Expr as LiteralReference;
if (refExpr == null)
throw new InvalidOperationException("Unable to resolve port/signal reference expression");
DimSpec[] dimSamples = new DimSpec[args.Length - 1];
Expression[] indices = args.Skip(1).Select(arg => arg.Expr).ToArray();
bool isStatic = true;
for (int i = 1; i < args.Length; i++)
{
var convidx = TypeConversions.ConvertValue(args[i].Sample, typeof(int));
if (convidx != null)
{
dimSamples[i - 1] = (int)convidx;
}
else if (args[i].Sample is Range)
{
dimSamples[i - 1] = (Range)args[i].Sample;
}
else
{
dimSamples = null;
break;
}
// EVariability.LocalVariable is not static as well, since variables
// inside for loops will have that variability.
if (args[i].Variability != EVariability.Constant)
isStatic = false;
}
IndexSpec indexSpec = null;
indexSpec = new IndexSpec(dimSamples);
SignalRef sigRef = null;
LambdaLiteralVisitor llv = new LambdaLiteralVisitor()
{
OnVisitConstant = x =>
{
sigRef = new SignalRef(
((SignalBase)x.ConstantValue).Descriptor,
SignalRef.EReferencedProperty.Instance,
new Expression[][] { indices }, indexSpec, isStatic);
},
OnVisitFieldRef = x => { throw new InvalidOperationException(); },
OnVisitSignalRef = x =>
{
sigRef = new SignalRef(
x.Desc,
x.Prop,
x.Indices.Concat(new Expression[][] { indices }),
indexSpec.Project(x.IndexSample),
x.IsStaticIndex && isStatic);
},
OnVisitVariable = x => { throw new InvalidOperationException(); },
OnVisitThisRef = x => { throw new InvalidOperationException(); }
};
refExpr.ReferencedObject.Accept(llv);
object rsample = null;
Type[] argTypes = args
.Skip(1)
.Select(a => a.Expr.ResultType.CILType)
.ToArray();
object[] argSamples = args
.Select(a => a.Sample)
.ToArray();
MethodInfo indexerSampleMethod = callee.DeclaringType.GetMethod(
"GetIndexerSample",
BindingFlags.Instance | BindingFlags.NonPublic,
null,
argTypes,
null);
if (indexerSampleMethod != null && argSamples.All(a => a != null))
{
rsample = indexerSampleMethod.Invoke(argSamples);
}
else
{
try
{
rsample = callee.Invoke(args.Select(x => x.Sample).ToArray());
}
catch (TargetInvocationException)
{
}
}
stack.Push(sigRef, rsample);
return true;
}
