Move AssemblyLoadContext VM-invoked static resolve methods to shared (#26248)

Shared between CoreCLR and Mono. Mono began using a copy of these methods with https://github.com/mono/mono/pull/16256/

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/netcore/System.Private.CoreLib/shared/System/Runtime/Loader/AssemblyLoadContext.cs b/netcore/System.Private.CoreLib/shared/System/Runtime/Loader/AssemblyLoadContext.cs
index e7e928560e9..a2cc279c2d6 100644
--- a/netcore/System.Private.CoreLib/shared/System/Runtime/Loader/AssemblyLoadContext.cs
+++ b/netcore/System.Private.CoreLib/shared/System/Runtime/Loader/AssemblyLoadContext.cs
@@ -657,6 +657,48 @@ namespace System.Runtime.Loader
 
             return assembly;
         }
+
+        // This method is called by the VM.
+        private static void OnAssemblyLoad(RuntimeAssembly assembly)
+        {
+            AssemblyLoad?.Invoke(AppDomain.CurrentDomain, new AssemblyLoadEventArgs(assembly));
+        }
+
+        // This method is called by the VM.
+        private static RuntimeAssembly? OnResourceResolve(RuntimeAssembly assembly, string resourceName)
+        {
+            return InvokeResolveEvent(ResourceResolve, assembly, resourceName);
+        }
+
+        // This method is called by the VM
+        private static RuntimeAssembly? OnTypeResolve(RuntimeAssembly assembly, string typeName)
+        {
+            return InvokeResolveEvent(TypeResolve, assembly, typeName);
+        }
+
+        // This method is called by the VM.
+        private static RuntimeAssembly? OnAssemblyResolve(RuntimeAssembly assembly, string assemblyFullName)
+        {
+            return InvokeResolveEvent(AssemblyResolve, assembly, assemblyFullName);
+        }
+
+        private static RuntimeAssembly? InvokeResolveEvent(ResolveEventHandler? eventHandler, RuntimeAssembly assembly, string name)
+        {
+            if (eventHandler == null)
+                return null;
+
+            var args = new ResolveEventArgs(name, assembly);
+
+            foreach (ResolveEventHandler handler in eventHandler.GetInvocationList())
+            {
+                Assembly? asm = handler(AppDomain.CurrentDomain, args);
+                RuntimeAssembly? ret = GetRuntimeAssembly(asm);
+                if (ret != null)
+                    return ret;
+            }
+
+            return null;
+        }
 #endif // !CORERT
 
         private Assembly? ResolveSatelliteAssembly(AssemblyName assemblyName)