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//
// BackingFieldResolver.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
//
// (C) 2009 - 2010 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Reflection;
using System.Reflection.Emit;
namespace Mono.Reflection {
public static class BackingFieldResolver {
class FieldPattern : ILPattern {
public static object FieldKey = new object ();
ILPattern pattern;
public FieldPattern (ILPattern pattern)
{
this.pattern = pattern;
}
public override void Match (MatchContext context)
{
pattern.Match (context);
if (!context.success)
return;
var match = GetLastMatchingInstruction (context);
var field = (FieldInfo) match.Operand;
context.AddData (FieldKey, field);
}
}
static ILPattern Field (OpCode opcode)
{
return new FieldPattern (ILPattern.OpCode (opcode));
}
static ILPattern GetterPattern =
ILPattern.Sequence (
ILPattern.Optional (OpCodes.Nop),
ILPattern.Either (
Field (OpCodes.Ldsfld),
ILPattern.Sequence (
ILPattern.OpCode (OpCodes.Ldarg_0),
Field (OpCodes.Ldfld))),
ILPattern.Optional (
ILPattern.Sequence (
ILPattern.OpCode (OpCodes.Stloc_0),
ILPattern.OpCode (OpCodes.Br_S),
ILPattern.OpCode (OpCodes.Ldloc_0))),
ILPattern.OpCode (OpCodes.Ret));
static ILPattern SetterPattern =
ILPattern.Sequence (
ILPattern.Optional (OpCodes.Nop),
ILPattern.OpCode (OpCodes.Ldarg_0),
ILPattern.Either (
Field (OpCodes.Stsfld),
ILPattern.Sequence (
ILPattern.OpCode (OpCodes.Ldarg_1),
Field (OpCodes.Stfld))),
ILPattern.OpCode (OpCodes.Ret));
static FieldInfo GetBackingField (MethodInfo method, ILPattern pattern)
{
var result = ILPattern.Match (method, pattern);
if (!result.success)
throw new ArgumentException ();
object value;
if (!result.TryGetData (FieldPattern.FieldKey, out value))
throw new InvalidOperationException ();
return (FieldInfo) value;
}
public static FieldInfo GetBackingField (this PropertyInfo self)
{
if (self == null)
throw new ArgumentNullException ("self");
var getter = self.GetGetMethod (true);
if (getter != null)
return GetBackingField (getter, GetterPattern);
var setter = self.GetSetMethod (true);
if (setter != null)
return GetBackingField (setter, SetterPattern);
throw new ArgumentException ();
}
}
}
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