/// <summary>
/// Create a singleton field used to store parameter information for the provided method.
/// </summary>
/// <param name="method">The method weaver.</param>
/// <param name="param">The parameter.</param>
/// <returns></returns>
public Variable CreateParameterInfo(MethodEmitter method, ParameterReference param)
{
var parent = method.Parent.Target.IsNotPublic ? method.Parent : CreateTypeContainer(method.Parent.Target);
var type = method.Parent.Target;
var id = method.Target.GetHashString();
var name = $"<{method.Target.Name}${id}${param.Index}>k__ParameterInfo";
var existing = parent.GetField(name, Context.Finder.ParameterInfo, toStatic: true);
if (existing != null)
{
return(existing);
}
var field = parent.EmitField(name, Context.Finder.ParameterInfo, toStatic: true, toPublic: true);
var il = parent.GetStaticConstructor().GetIL();
il.Emit(Codes.Nop);
il.Emit(Codes.LoadToken(type.HasGenericParameters ? method.Target : method.Target.GetGeneric()));
il.Emit(Codes.LoadToken(type.GetGeneric()));
il.Emit(Codes.InvokeStatic(Context.Finder.MethodBaseGetMethodFromHandleAndType));
il.Emit(Codes.Invoke(Context.Finder.MethodBaseGetParameters));
il.Emit(Codes.Int(param.Index));
il.Emit(Codes.LoadArray);
il.Emit(Codes.Store(field));
return(field);
}
/// <summary>
/// Create a singleton field used to store property information for the provided property.
/// </summary>
/// <param name="property">The property weaver.</param>
/// <returns></returns>
public Variable CreatePropertyInfo(PropertyEmitter property)
{
var parent = property.Parent.Target.IsNotPublic ? property.Parent : CreateTypeContainer(property.Parent.Target);
var type = property.Parent.Target;
var sta = (property.Target.GetMethod ?? property.Target.SetMethod).IsStatic;
var name = $"<{property.Target.Name}>k__PropertyInfo";
var existing = parent.GetField(name, Context.Finder.PropertyInfo, toStatic: true);
if (existing != null)
{
return(existing);
}
var field = parent.EmitField(name, Context.Finder.PropertyInfo, toStatic: true, toPublic: true);
var flags = BindingFlags.NonPublic | BindingFlags.Public | (sta ? BindingFlags.Static : BindingFlags.Instance);
var il = parent.GetStaticConstructor().GetIL();
il.Emit(Codes.Nop);
il.Emit(Codes.LoadToken(type.GetGeneric()));
il.Emit(Codes.InvokeStatic(Context.Finder.TypeGetTypeFromHandle));
il.Emit(Codes.String(property.Target.Name));
il.Emit(Codes.Int((int)flags));
il.Emit(Codes.Invoke(Context.Finder.TypeGetProperty));
il.Emit(Codes.Store(field));
return(field);
}
/// <summary>
/// Weaves the constructor interceptors for a provided type and interceptor information.
/// </summary>
/// <param name="weaver">The weaver.</param>
/// <param name="item">The interceptors.</param>
public void WeaveConstructorInterceptors(TypeEmitter weaver, ConstructorInterceptorInfo item)
{
var constructors = weaver.GetConstructors();
foreach (var init in item.Initializers)
{
var parameters = init.Parameters;
if (parameters.Any(p => !p.IsOptional))
{
throw new NotSupportedException($"Cannot use constructor injection against a method with non-optional parameters");
}
var after = init.GetAttribute(Context.Finder.IInjectAfterInitializer);
var before = init.GetAttribute(Context.Finder.IInjectBeforeInitializer);
if (init.HasGenericParameters)
{
throw new NotSupportedException($"Cannot use constructor injection against a generic method");
}
foreach (var ctor in constructors)
{
var il = ctor.GetIL();
var st = init.IsStatic;
il.Body.SimplifyMacros();
il.Insert = CodeInsertion.Before;
il.Position = before != null ? (il.GetConstructorBaseOrThis()?.Next ?? il.GetFirst()) : il.GetLast();
if (!st)
{
il.Emit(Codes.This);
}
var type = ctor.Parent.Target.GetGeneric();
var method = (MethodReference)init;
if (type.IsGenericInstance)
{
var generic = (GenericInstanceType)type;
method = init.MakeGeneric(generic.GenericArguments.ToArray());
}
foreach (var param in parameters)
{
il.Emit(Codes.Load(param.Constant));
}
il.Emit(st ? Codes.InvokeStatic(method) : Codes.Invoke(method));
if (method.IsReturn())
{
il.Emit(Codes.Pop);
}
il.Body.InitLocals = true;
il.Body.OptimizeMacros();
}
if (after != null)
{
init.CustomAttributes.Remove(after);
}
if (before != null)
{
init.CustomAttributes.Remove(before);
}
}
}
