//
// Author:
// Miguel de Icaza (miguel@ximian.com)
+// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) Ximian, Inc. http://www.ximian.com
+// (C) 2003 Novell, Inc. http://www.novell.com
//
+//
+// Copyright (C) 2004 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.
+//
+
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+// Files:
+// - mscorlib/system/valuetype.cs
+//
+
+using System.Reflection;
using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Threading;
-namespace System {
-
- public abstract class ValueType {
+namespace System
+{
+ [Serializable]
+ [ComVisible (true)]
+ public abstract class ValueType
+ {
+ /*
+ * Caution: Fields added to ValueType can mess with sub class layouts.
+ * Causing bugs that appear completely unrelated as #30060
+ */
+ private static class Internal
+ {
+ public static int hash_code_of_ptr_seed = 0;
+ }
- // <summary>
- // ValueType constructor
- // </summary>
protected ValueType ()
{
}
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ private extern static bool InternalEquals (object o1, object o2, out object[] fields);
+
+ // This is also used by RuntimeHelpers
+ internal static bool DefaultEquals (object o1, object o2)
+ {
+ if (o1 == null && o2 == null)
+ return true;
+ if (o1 == null || o2 == null)
+ return false;
+
+ RuntimeType o1_type = (RuntimeType) o1.GetType ();
+ RuntimeType o2_type = (RuntimeType) o2.GetType ();
+
+ if (o1_type != o2_type)
+ return false;
+
+ object[] fields;
+ bool res = InternalEquals (o1, o2, out fields);
+ if (fields == null)
+ return res;
+
+ for (int i = 0; i < fields.Length; i += 2) {
+ object meVal = fields [i];
+ object youVal = fields [i + 1];
+ if (meVal == null) {
+ if (youVal == null)
+ continue;
+
+ return false;
+ }
+
+ if (!meVal.Equals (youVal))
+ return false;
+ }
+
+ return true;
+ }
+
// <summary>
// True if this instance and o represent the same type
// and have the same value.
// </summary>
- [MethodImplAttribute(MethodImplOptions.InternalCall)]
- public extern override bool Equals (object o);
+ public override bool Equals (object obj)
+ {
+ return DefaultEquals (this, obj);
+ }
+
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal extern static int InternalGetHashCode (object o, out object[] fields);
// <summary>
// Gets a hashcode for this value type using the
// bits in the structure
// </summary>
- [MethodImplAttribute(MethodImplOptions.InternalCall)]
- public extern override int GetHashCode ();
+ public override int GetHashCode ()
+ {
+ object[] fields;
+ int result = InternalGetHashCode (this, out fields);
+
+ if (fields != null)
+ for (int i = 0; i < fields.Length; ++i)
+ if (fields [i] != null)
+ result ^= fields [i].GetHashCode ();
+
+ return result;
+ }
+
+ internal static int GetHashCodeOfPtr (IntPtr ptr)
+ {
+ int hash_code = (int) ptr;
+ int seed = Internal.hash_code_of_ptr_seed;
+
+ if (seed == 0) {
+ /* We use the first non-0 pointer as the seed, all hashcodes will be
+ * based off that. This is to make sure that we only reveal relative
+ * memory addresses and never absolute ones. */
+ seed = hash_code;
+ Interlocked.CompareExchange (ref Internal.hash_code_of_ptr_seed, seed, 0);
+ seed = Internal.hash_code_of_ptr_seed;
+ }
+
+ return hash_code - seed;
+ }
// <summary>
// Stringified representation of this ValueType.
// </summary>
public override string ToString ()
{
- return GetType().FullName;
+ return GetType ().FullName;
}
}
}
projects / mono.git / blobdiff