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2021-09-20 18:20:01 +02:00
/*
Copyright (C) 2014-2019 de4dot@gmail.com
This file is part of dnSpy
dnSpy is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
dnSpy is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Threading;
namespace dnSpy.Debugger.DotNet.CorDebug.Impl {
abstract class DnDebuggerObjectHolder {
public abstract void Dispose();
public abstract void Close();
public abstract DbgEngineImpl? Engine { get; }
}
abstract class DnDebuggerObjectHolder<T> : DnDebuggerObjectHolder where T : class {
public bool IsClosed => Object is null;
public abstract T? Object { get; }
public abstract int HashCode { get; }
public abstract DnDebuggerObjectHolder<T> AddRef();
}
sealed class DnDebuggerObjectHolderImpl<T> : DnDebuggerObjectHolder<T> where T : class {
public override T? Object => obj;
public override int HashCode { get; }
public override DbgEngineImpl? Engine => engine;
T? obj;
DbgEngineImpl? engine;
int refCount;
DnDebuggerObjectHolderImpl(DbgEngineImpl engine, T obj) {
this.obj = obj ?? throw new ArgumentNullException(nameof(obj));
HashCode = obj.GetHashCode();
this.engine = engine ?? throw new ArgumentNullException(nameof(engine));
refCount = 1;
}
/// <summary>
/// Should only be called by <see cref="DbgEngineImpl"/>
/// </summary>
public static DnDebuggerObjectHolderImpl<T> Create_DONT_CALL(DbgEngineImpl engine, T obj) => new DnDebuggerObjectHolderImpl<T>(engine, obj);
public override DnDebuggerObjectHolder<T> AddRef() {
Interlocked.Increment(ref refCount);
return this;
}
public override void Close() {
if (Interlocked.Decrement(ref refCount) == 0) {
// engine can be null if its breakpoint is still alive or DbgEngineImpl gets closed before
// some code has a chance to call Close()
engine?.Remove(this);
}
}
public override void Dispose() {
obj = null;
engine = null;
}
}
}