/// <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>
/// 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>
/// Copies the values of an array of parameter values into the corresponding parameters.
/// </summary>
/// <param name="method">The method.</param>
/// <param name="array">The array.</param>
public void CopyArgumentArrayToParameters(MethodEmitter method, Variable array)
{
var parameters = method.Target.Parameters;
var count = parameters.Count;
var il = method.GetIL();
for (int i = 0; i < count; i++)
{
var p = parameters[i];
var variable = new Variable(p);
var type = p.ParameterType;
if (type.IsByReference || p.IsOut)
{
continue;
}
il.Emit(Codes.Load(array));
il.Emit(Codes.Int(i));
il.Emit(Codes.LoadArray);
il.Emit(Codes.Unbox(type));
il.Emit(Codes.Store(variable));
}
CopyArgumentArrayToReferences(method, array);
}
/// <summary>
/// Creates a reference to a parameter used in a custom attribute.
/// </summary>
/// <param name="emitter">The emitter.</param>
/// <param name="attribute">The attribute.</param>
/// <param name="arg">The argument.</param>
public void CreateAttributeParameter(MethodEmitter emitter, CustomAttribute attribute, CustomAttributeArgument arg)
{
var il = emitter.GetIL();
if (arg.Value == null)
{
il.Emit(Codes.Null);
return;
}
var type = arg.Type;
if (type.IsArray)
{
var elements = (arg.Value as IEnumerable).Cast <CustomAttributeArgument>().ToArray();
il.Emit(Codes.Int(elements.Length));
il.Emit(Codes.CreateArray(type.GetElementType()));
if (elements.Length == 0)
{
return;
}
il.Emit(Codes.Duplicate);
for (int i = 0, count = elements.Length; i < count; i++)
{
il.Emit(Codes.Int(i));
if (elements[i].Value == null)
{
il.Emit(Codes.Null);
il.Emit(Codes.StoreArray);
}
else
{
il.Emit(Codes.Load(elements[i].Value));
il.Emit(Codes.StoreArray);
}
if (i + 1 < count)
{
il.Emit(Codes.Duplicate);
}
}
}
else
{
il.Emit(Codes.Load(arg.Value));
}
}
/// <summary>
/// Copies the values of an array of parameter values into the required references.
/// </summary>
/// <param name="method">The method.</param>
/// <param name="array">The array.</param>
public void CopyArgumentArrayToReferences(MethodEmitter method, Variable array)
{
var parameters = method.Target.Parameters;
var count = parameters.Count;
var il = method.GetIL();
for (int i = 0; i < count; i++)
{
var p = parameters[i];
var type = p.ParameterType;
if (!type.IsByReference || p.IsOut)
{
continue;
}
var spec = (TypeSpecification)type;
var unboxing = true;
il.Emit(Codes.Arg(p));
il.Emit(Codes.Load(array));
il.Emit(Codes.Int(i));
il.Emit(Codes.LoadArray);
var code = OpCodes.Nop;
switch (spec.ElementType.MetadataType)
{
case MetadataType.Boolean:
case MetadataType.SByte:
case MetadataType.Byte:
code = OpCodes.Stind_I1;
break;
case MetadataType.Int16:
case MetadataType.UInt16:
code = OpCodes.Stind_I2;
break;
case MetadataType.Int32:
case MetadataType.UInt32:
code = OpCodes.Stind_I4;
break;
case MetadataType.Int64:
case MetadataType.UInt64:
code = OpCodes.Stind_I8;
break;
case MetadataType.Single:
code = OpCodes.Stind_R4;
break;
case MetadataType.Double:
code = OpCodes.Stind_R8;
break;
case MetadataType.IntPtr:
case MetadataType.UIntPtr:
code = OpCodes.Stind_I;
break;
default:
if (spec.ElementType.IsValueType)
{
il.Emit(Instruction.Create(OpCodes.Stobj, spec.ElementType));
}
else
{
code = OpCodes.Stind_Ref;
unboxing = false;
}
break;
}
if (unboxing)
{
il.Emit(Codes.Unbox(spec.ElementType));
}
if (code != OpCodes.Nop)
{
il.Emit(code);
}
}
}
/// <summary>
/// Create an array variable containing the arguments of the method invocation.
/// </summary>
/// <param name="method">The method weaver.</param>
/// <returns></returns>
public Variable CreateArgumentArray(MethodEmitter method)
{
var parameters = method.Target.Parameters;
var count = parameters.Count;
var array = method.EmitLocal(Context.Finder.ObjectArray);
var il = method.GetIL();
il.Emit(Codes.Nop);
il.Emit(Codes.Int(count));
il.Emit(Codes.CreateArray(TypeSystem.ObjectReference));
il.Emit(Codes.Store(array));
for (int i = 0; i < count; i++)
{
var p = parameters[i];
var type = p.ParameterType;
il.Emit(Codes.Load(array));
il.Emit(Codes.Int(i));
if (p.IsOut)
{
var spec = (TypeSpecification)type;
if (spec.ElementType.IsValueType)
{
il.Emit(Codes.Init(spec.ElementType));
}
else
{
il.Emit(Codes.Null);
il.Emit(Codes.StoreArray);
}
continue;
}
il.Emit(Codes.Arg(p));
if (type.IsByReference)
{
var spec = (TypeSpecification)type;
var boxing = true;
switch (spec.ElementType.MetadataType)
{
case MetadataType.SByte:
il.Emit(OpCodes.Ldind_I1);
break;
case MetadataType.Int16:
il.Emit(OpCodes.Ldind_I2);
break;
case MetadataType.Int32:
il.Emit(OpCodes.Ldind_I4);
break;
case MetadataType.Int64:
case MetadataType.UInt64:
il.Emit(OpCodes.Ldind_I8);
break;
case MetadataType.Boolean:
case MetadataType.Byte:
il.Emit(OpCodes.Ldind_U1);
break;
case MetadataType.UInt16:
il.Emit(OpCodes.Ldind_U2);
break;
case MetadataType.UInt32:
il.Emit(OpCodes.Ldind_U4);
break;
case MetadataType.Single:
il.Emit(OpCodes.Ldind_R4);
break;
case MetadataType.Double:
il.Emit(OpCodes.Ldind_R8);
break;
case MetadataType.IntPtr:
case MetadataType.UIntPtr:
il.Emit(OpCodes.Ldind_I);
break;
default:
if (spec.ElementType.IsValueType)
{
il.Emit(Instruction.Create(OpCodes.Ldobj, spec.ElementType));
}
else
{
il.Emit(OpCodes.Ldind_Ref);
boxing = false;
}
break;
}
if (boxing)
{
il.Emit(Codes.Box(spec.ElementType));
}
}
else
{
il.Emit(Codes.Box(p.ParameterType));
}
il.Emit(Codes.StoreArray);
}
return(array);
}
