netcore/System.Private.CoreLib/src/System/ValueType.cs

   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3 // See the LICENSE file in the project root for more information.
   4
   5 using System.Reflection;
   6 using System.Runtime.CompilerServices;
   7
   8 namespace System
   9 {
  10         [Serializable]
  11         [System.Runtime.CompilerServices.TypeForwardedFrom ("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
  12         public abstract class ValueType
  13         {
  14                 // This is also used by RuntimeHelpers
  15                 internal static bool DefaultEquals (object o1, object o2)
  16                 {
  17                         RuntimeType o1_type = (RuntimeType) o1.GetType ();
  18                         RuntimeType o2_type = (RuntimeType) o2.GetType ();
  19
  20                         if (o1_type != o2_type)
  21                                 return false;
  22
  23                         object[] fields;
  24                         bool res = InternalEquals (o1, o2, out fields);
  25                         if (fields == null)
  26                                 return res;
  27
  28                         for (int i = 0; i < fields.Length; i += 2) {
  29                                 object meVal = fields [i];
  30                                 object youVal = fields [i + 1];
  31                                 if (meVal == null) {
  32                                         if (youVal == null)
  33                                                 continue;
  34
  35                                         return false;
  36                                 }
  37
  38                                 if (!meVal.Equals (youVal))
  39                                         return false;
  40                         }
  41
  42                         return true;
  43                 }
  44
  45                 public override bool Equals (object? obj)
  46                 {
  47                         if (obj == null)
  48                                 return false;
  49
  50                         return DefaultEquals (this, obj);
  51                 }
  52
  53                 public override int GetHashCode ()
  54                 {
  55                         int result = InternalGetHashCode (this, out var fields);
  56
  57                         if (fields != null)
  58                                 for (int i = 0; i < fields.Length; ++i)
  59                                         if (fields [i] != null)
  60                                                 result ^= fields [i].GetHashCode ();
  61
  62                         return result;
  63                 }
  64
  65                 public override string ToString ()
  66                 {
  67                         return GetType ().ToString ();
  68                 }
  69
  70
  71                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  72                 extern static int InternalGetHashCode (object o, out object[]? fields);
  73
  74                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  75                 extern static bool InternalEquals (object o1, object o2, out object[] fields);
  76         }
  77 }