public IXamlILEmitter MarkLabel(IXamlLabel label)
{
if (_labels.TryGetValue(label, out var info))
{
info.Offset = Instructions.Count;
}
_inner.MarkLabel(label);
return(this);
}
public IXamlILEmitter MarkLabel(IXamlLabel label)
{
if (!_unmarkedLabels.Remove(label))
{
throw new InvalidOperationException("Attempt to mark undeclared label");
}
_inner.MarkLabel(label);
_labelsToMarkOnNextInstruction.Add(label);
return(this);
}
public static IXamlILEmitter Ble(this IXamlILEmitter emitter, IXamlLabel label) => emitter.Emit(OpCodes.Ble, label);
public IXamlILEmitter Emit(OpCode code, IXamlLabel label)
{
_ilg.Emit(code, ((SreLabel)label).Label);
return(this);
}
public IXamlILEmitter MarkLabel(IXamlLabel label)
{
_ilg.MarkLabel(((SreLabel)label).Label);
return(this);
}
public IXamlILEmitter Emit(OpCode code, IXamlLabel label)
{
Record(code, label);
_inner.Emit(code, label);
return(this);
}
public IXamlILEmitter Emit(SreOpCode code, IXamlLabel label) => Emit(((CecilLabel)label).CreateInstruction(Dic[code]));
public IXamlILEmitter MarkLabel(IXamlLabel label)
{
_markedLabels.Add((CecilLabel)label);
return(this);
}
public XamlILNodeEmitResult Emit(IXamlAstNode node, XamlEmitContextWithLocals <IXamlILEmitter, XamlILNodeEmitResult> context, IXamlILEmitter codeGen)
{
if (!(node is XamlPropertyAssignmentNode an))
{
return(null);
}
var setters = ValidateAndGetSetters(an);
for (var c = 0; c < an.Values.Count - 1; c++)
{
context.Emit(an.Values[c], codeGen, an.Values[c].Type.GetClrType());
}
var value = an.Values.Last();
var isValueType = value.Type.GetClrType().IsValueType;
// If there is only one available setter or if value is a value type, always use the first one
if (setters.Count == 1 || isValueType)
{
var setter = an.PossibleSetters.First();
using (codeGen.EmitSetPropertyMarker(setter))
{
context.Emit(value, codeGen, setter.Parameters.Last());
context.Emit(setter, codeGen);
}
}
else
{
var checkedTypes = new List <IXamlType>();
var exit = codeGen.DefineLabel();
IXamlLabel next = null;
var hadJumps = false;
context.Emit(value, codeGen, value.Type.GetClrType());
foreach (var setter in setters)
{
var type = setter.Parameters.Last();
// We have already checked this type or its base type
if (checkedTypes.Any(ch => ch.IsAssignableFrom(type)))
{
continue;
}
if (next != null)
{
codeGen.MarkLabel(next);
next = null;
}
IXamlLabel Next() => next ?? (next = codeGen.DefineLabel());
var checkNext = false;
if (setter.BinderParameters.AllowRuntimeNull)
{
checkedTypes.Add(type);
}
else
{
// Check for null; Also don't add this type to the list of checked ones because of the null check
codeGen
.Dup()
.Brfalse(Next());
checkNext = true;
}
// Only do dynamic checks if we know that type is not assignable by downcast
if (!type.IsAssignableFrom(value.Type.GetClrType()))
{
codeGen
.Dup()
.Isinst(type)
.Brfalse(Next());
checkNext = true;
}
if (checkNext)
{
hadJumps = true;
}
ILEmitHelpers.EmitConvert(context, codeGen, value, value.Type.GetClrType(), type);
context.Emit(setter, codeGen);
if (hadJumps)
{
codeGen.Br(exit);
}
if (!checkNext)
{
break;
}
}
if (next != null)
{
codeGen.MarkLabel(next);
if (setters.Any(x => !x.BinderParameters.AllowRuntimeNull))
{
next = codeGen.DefineLabel();
codeGen
.Dup()
.Brtrue(next)
.Newobj(context.Configuration.TypeSystem.GetType("System.NullReferenceException")
.FindConstructor())
.Throw();
codeGen.MarkLabel(next);
}
codeGen
.Newobj(context.Configuration.TypeSystem.GetType("System.InvalidCastException")
.FindConstructor())
.Throw();
}
codeGen.MarkLabel(exit);
}
return(XamlILNodeEmitResult.Void(1));
}
