void InjectRaiseMethodCall(PropertyDefinition property, MethodDefinition raiseMethod)
{
var setter = property.SetMethod;
var body = setter.Body;
var firstInstr = body.Instructions.First();
var retInstr = body.Instructions.Last();
var il = body.GetILProcessor();
var info = CheckSetter(body, raiseMethod);
switch (info)
{
case NpcInjectionPropertyInfo.Ok:
{
var fieldRef = (FieldReference)body.Instructions[2].Operand;
var propertyType = setter.Parameters[0].ParameterType;
if (propertyType.IsPrimitive)
{
EmitPrimitiveEqualityCheck(il, firstInstr, fieldRef, retInstr);
}
else if (propertyType.IsValueType)
{
EmitValueTypeEqualityCheck(il, firstInstr, fieldRef, retInstr, propertyType);
}
else
{
EmitReferenceTypeEqualityCheck(il, firstInstr, fieldRef, retInstr);
}
goto case NpcInjectionPropertyInfo.NoEqualityCheckInjected;
}
case NpcInjectionPropertyInfo.NoEqualityCheckInjected:
il.InsertBefore(retInstr, Instruction.Create(OpCodes.Ldarg_0));
il.InsertBefore(retInstr, Instruction.Create(OpCodes.Ldstr, property.Name));
il.InsertBefore(retInstr, Instruction.Create(OpCodes.Callvirt, this.module.Import(raiseMethod)));
break;
}
this.callback.NotifyProperty(property.GetQualifiedName(), info);
}
///////////////////////////////////////////////////////////////////////
void ProcessProperty(PropertyDefinition property, MethodDefinition raiseMethod, bool isDependencyAware)
{
if (HasIgnoreNpcAttribute(property))
{
this.callback.NotifyProperty(property.GetQualifiedName(),
NpcInjectionPropertyInfo.Ignored);
return;
}
if (property.SetMethod != null)
{
InjectRaiseMethodCall(property, raiseMethod);
}
if (property.GetMethod != null && isDependencyAware)
{
InjectDependsUponAttributes(property);
}
}
void InjectDependsUponAttributes(PropertyDefinition property)
{
var getter = property.GetMethod;
var body = getter.Body;
var instructions = body.Instructions;
// look for a call to a property getter on this instance ("this.Property"):
// Ldarg_0
// Call get_Property
var calledProperties = (from instr in instructions.Skip(1)
where instr.OpCode == OpCodes.Call || instr.OpCode == OpCodes.Callvirt
let methodRef = instr.Operand as MethodReference
where methodRef != null && methodRef.Name.StartsWith("get_", StringComparison.Ordinal)
let method = methodRef.Resolve()
where method.IsGetter && method.IsStatic == false
let prev = instr.Previous
where prev.OpCode == OpCodes.Ldarg_0 ||
prev.OpCode == OpCodes.Ldarg && Object.Equals(prev.Operand, 0)
select method.Name.Substring(4))
.ToList();
if (calledProperties.Count > 0)
{
foreach (var calledProperty in calledProperties)
{
var customAttr = new CustomAttribute(
this.module.ImportCtor <DependsUponAttribute>(typeof(string)));
customAttr.ConstructorArguments.Add(
new CustomAttributeArgument(this.module.TypeSystem.String, calledProperty));
property.CustomAttributes.Add(customAttr);
}
this.callback.NotifyPropertyDependencies(property.GetQualifiedName(), calledProperties);
}
}