diff options
Diffstat (limited to 'src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs')
| -rw-r--r-- | src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs b/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs new file mode 100644 index 00000000..6814abea --- /dev/null +++ b/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs @@ -0,0 +1,176 @@ +// This temporary utility fixes an esoteric issue in XNA Framework where deserialization depends on +// the order of fields returned by Type.GetFields, but that order changes after Harmony/MonoMod use +// reflection to access the fields due to an issue in .NET Framework. +// https://twitter.com/0x0ade/status/1414992316964687873 +// +// This will be removed when Harmony/MonoMod are updated to incorporate the fix. +// +// Special thanks to 0x0ade for submitting this worokaround! Copy/pasted and adapted from MonoMod. + +using System; +using System.Collections.Generic; +using System.Diagnostics.CodeAnalysis; +using System.Reflection; +using System.Reflection.Emit; +using System.Runtime.CompilerServices; +using HarmonyLib; + +// ReSharper disable once CheckNamespace -- Temporary hotfix submitted by the MonoMod author. +namespace MonoMod.Utils +{ + [SuppressMessage("ReSharper", "InconsistentNaming", Justification = "Temporary hotfix submitted by the MonoMod author.")] + [SuppressMessage("ReSharper", "PossibleNullReferenceException", Justification = "Temporary hotfix submitted by the MonoMod author.")] + static class MiniMonoModHotfix + { + // .NET Framework can break member ordering if using Module.Resolve* on certain members. + + private static readonly object[] _NoArgs = new object[0]; + private static readonly object[] _CacheGetterArgs = { /* MemberListType.All */ 0, /* name apparently always null? */ null }; + + private static readonly Type t_RuntimeModule = + typeof(Module).Assembly + .GetType("System.Reflection.RuntimeModule"); + + private static readonly PropertyInfo p_RuntimeModule_RuntimeType = + typeof(Module).Assembly + .GetType("System.Reflection.RuntimeModule") + ?.GetProperty("RuntimeType", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); + + private static readonly Type t_RuntimeType = + typeof(Type).Assembly + .GetType("System.RuntimeType"); + + private static readonly PropertyInfo p_RuntimeType_Cache = + typeof(Type).Assembly + .GetType("System.RuntimeType") + ?.GetProperty("Cache", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); + + private static readonly MethodInfo m_RuntimeTypeCache_GetFieldList = + typeof(Type).Assembly + .GetType("System.RuntimeType+RuntimeTypeCache") + ?.GetMethod("GetFieldList", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); + + private static readonly MethodInfo m_RuntimeTypeCache_GetPropertyList = + typeof(Type).Assembly + .GetType("System.RuntimeType+RuntimeTypeCache") + ?.GetMethod("GetPropertyList", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); + + private static readonly ConditionalWeakTable<Type, object> _CacheFixed = new ConditionalWeakTable<Type, object>(); + + public static void Apply() + { + var harmony = new Harmony("MiniMonoModHotfix"); + + harmony.Patch( + original: typeof(Harmony).Assembly + .GetType("HarmonyLib.MethodBodyReader") + .GetMethod("ReadOperand", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance), + transpiler: new HarmonyMethod(typeof(MiniMonoModHotfix), nameof(ResolveTokenFix)) + ); + + harmony.Patch( + original: typeof(Harmony).Assembly + .GetType("MonoMod.Utils.DynamicMethodDefinition+<>c__DisplayClass3_0") + .GetMethod("<_CopyMethodToDefinition>g__ResolveTokenAs|1", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance), + transpiler: new HarmonyMethod(typeof(MiniMonoModHotfix), nameof(ResolveTokenFix)) + ); + + } + + private static IEnumerable<CodeInstruction> ResolveTokenFix(IEnumerable<CodeInstruction> instrs) + { + MethodInfo getdecl = typeof(MiniMonoModHotfix).GetMethod(nameof(GetRealDeclaringType)); + MethodInfo fixup = typeof(MiniMonoModHotfix).GetMethod(nameof(FixReflectionCache)); + + foreach (CodeInstruction instr in instrs) + { + yield return instr; + + if (instr.operand is MethodInfo called) + { + switch (called.Name) + { + case "ResolveType": + // type.FixReflectionCache(); + yield return new CodeInstruction(OpCodes.Dup); + yield return new CodeInstruction(OpCodes.Call, fixup); + break; + + case "ResolveMember": + case "ResolveMethod": + case "ResolveField": + // member.GetRealDeclaringType().FixReflectionCache(); + yield return new CodeInstruction(OpCodes.Dup); + yield return new CodeInstruction(OpCodes.Call, getdecl); + yield return new CodeInstruction(OpCodes.Call, fixup); + break; + } + } + } + } + + public static Type GetModuleType(this Module module) + { + // Sadly we can't blindly resolve type 0x02000001 as the runtime throws ArgumentException. + + if (module == null || t_RuntimeModule == null || !t_RuntimeModule.IsInstanceOfType(module)) + return null; + + // .NET + if (p_RuntimeModule_RuntimeType != null) + return (Type)p_RuntimeModule_RuntimeType.GetValue(module, _NoArgs); + + // The hotfix doesn't apply to Mono anyway, thus that's not copied over. + + return null; + } + + public static Type GetRealDeclaringType(this MemberInfo member) + => member.DeclaringType ?? member.Module?.GetModuleType(); + + public static void FixReflectionCache(this Type type) + { + if (t_RuntimeType == null || + p_RuntimeType_Cache == null || + m_RuntimeTypeCache_GetFieldList == null || + m_RuntimeTypeCache_GetPropertyList == null) + return; + + for (; type != null; type = type.DeclaringType) + { + // All types SHOULD inherit RuntimeType, including those built at runtime. + // One might never know what awaits us in the depths of reflection hell though. + if (!t_RuntimeType.IsInstanceOfType(type)) + continue; + + _CacheFixed.GetValue(type, rt => + { + + object cache = p_RuntimeType_Cache.GetValue(rt, _NoArgs); + _FixReflectionCacheOrder<PropertyInfo>(cache, m_RuntimeTypeCache_GetPropertyList); + _FixReflectionCacheOrder<FieldInfo>(cache, m_RuntimeTypeCache_GetFieldList); + + return new object(); + }); + } + } + + private static void _FixReflectionCacheOrder<T>(object cache, MethodInfo getter) where T : MemberInfo + { + // Get and discard once, otherwise we might not be getting the actual backing array. + getter.Invoke(cache, _CacheGetterArgs); + Array orig = (Array)getter.Invoke(cache, _CacheGetterArgs); + + // Sort using a short-lived list. + List<T> list = new List<T>(orig.Length); + for (int i = 0; i < orig.Length; i++) + list.Add((T)orig.GetValue(i)); + + list.Sort((a, b) => a.MetadataToken - b.MetadataToken); + + for (int i = orig.Length - 1; i >= 0; --i) + orig.SetValue(list[i], i); + } + + } +} |