From 629d2d09a0323f8456d78be0cc08d8206ed722df Mon Sep 17 00:00:00 2001
From: Esme Povirk <esme@codeweavers.com>
Date: Tue, 9 May 2023 13:20:21 -0500
Subject: [PATCH] mscoree: Search the Mono GAC before the appdomain paths.

---
 dlls/mscoree/metahost.c | 44 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/dlls/mscoree/metahost.c b/dlls/mscoree/metahost.c
index a9fb3be47d3..309ad639d42 100644
--- a/dlls/mscoree/metahost.c
+++ b/dlls/mscoree/metahost.c
@@ -130,6 +130,7 @@ MonoThread* (CDECL *mono_thread_attach)(MonoDomain *domain);
 void (CDECL *mono_thread_manage)(void);
 void (CDECL *mono_trace_set_print_handler)(MonoPrintCallback callback);
 void (CDECL *mono_trace_set_printerr_handler)(MonoPrintCallback callback);
+static MonoAssembly* (CDECL *wine_mono_assembly_load_from_gac)(MonoAssemblyName *aname, MonoImageOpenStatus *status, int refonly);
 static void (CDECL *wine_mono_install_assembly_preload_hook)(WineMonoAssemblyPreLoadFunc func, void *user_data);
 static void (CDECL *wine_mono_install_assembly_preload_hook_v2)(WineMonoAssemblyPreLoadFunc func, void *user_data);
 
@@ -253,6 +254,7 @@ static HRESULT load_mono(LPCWSTR mono_path)
         LOAD_OPT_MONO_FUNCTION(mono_set_crash_chaining, set_crash_chaining_dummy);
         LOAD_OPT_MONO_FUNCTION(mono_trace_set_print_handler, set_print_handler_dummy);
         LOAD_OPT_MONO_FUNCTION(mono_trace_set_printerr_handler, set_print_handler_dummy);
+        LOAD_OPT_MONO_FUNCTION(wine_mono_assembly_load_from_gac, NULL);
         LOAD_OPT_MONO_FUNCTION(wine_mono_install_assembly_preload_hook, NULL);
         LOAD_OPT_MONO_FUNCTION(wine_mono_install_assembly_preload_hook_v2, NULL);
 
@@ -1375,16 +1377,19 @@ HRESULT CLRMetaHostPolicy_CreateInstance(REFIID riid, void **ppobj)
  * Assembly search override settings:
  *
  * WINE_MONO_OVERRIDES=*,Gac=n
- *  Never search the GAC for libraries.
+ *  Never search the Windows GAC for libraries.
+ *
+ * WINE_MONO_OVERRIDES=*,MonoGac=n
+ *  Never search the Mono GAC for libraries.
  *
  * WINE_MONO_OVERRIDES=*,PrivatePath=n
  *  Never search the AppDomain search path for libraries.
  *
  * WINE_MONO_OVERRIDES=Microsoft.Xna.Framework,Gac=n
- *  Never search the GAC for Microsoft.Xna.Framework
+ *  Never search the Windows GAC for Microsoft.Xna.Framework
  *
  * WINE_MONO_OVERRIDES=Microsoft.Xna.Framework.*,Gac=n;Microsoft.Xna.Framework.GamerServices,Gac=y
- *  Never search the GAC for Microsoft.Xna.Framework, or any library starting
+ *  Never search the Windows GAC for Microsoft.Xna.Framework, or any library starting
  *  with Microsoft.Xna.Framework, except for Microsoft.Xna.Framework.GamerServices
  */
 
@@ -1392,7 +1397,8 @@ HRESULT CLRMetaHostPolicy_CreateInstance(REFIID riid, void **ppobj)
 #define ASSEMBLY_SEARCH_GAC 1
 #define ASSEMBLY_SEARCH_UNDEFINED 2
 #define ASSEMBLY_SEARCH_PRIVATEPATH 4
-#define ASSEMBLY_SEARCH_DEFAULT (ASSEMBLY_SEARCH_GAC|ASSEMBLY_SEARCH_PRIVATEPATH)
+#define ASSEMBLY_SEARCH_MONOGAC 8
+#define ASSEMBLY_SEARCH_DEFAULT (ASSEMBLY_SEARCH_GAC|ASSEMBLY_SEARCH_PRIVATEPATH|ASSEMBLY_SEARCH_MONOGAC)
 
 typedef struct override_entry {
     char *name;
@@ -1441,6 +1447,14 @@ static void parse_override_entry(override_entry *entry, const char *string, int
                         entry->flags &= ~ASSEMBLY_SEARCH_GAC;
                 }
                 break;
+            case 7:
+                if (!_strnicmp(string, "monogac", 7)) {
+                    if (IS_OPTION_TRUE(*value))
+                        entry->flags |= ASSEMBLY_SEARCH_MONOGAC;
+                    else if (IS_OPTION_FALSE(*value))
+                        entry->flags &= ~ASSEMBLY_SEARCH_MONOGAC;
+                }
+                break;
             case 11:
                 if (!_strnicmp(string, "privatepath", 11)) {
                     if (IS_OPTION_TRUE(*value))
@@ -1568,7 +1582,7 @@ static DWORD get_basename_search_flags(const char *basename, MonoAssemblyName *a
     if (strcmp(basename, "Microsoft.Xna.Framework.*") == 0 &&
         mono_assembly_name_get_version(aname, NULL, NULL, NULL) == 4)
         /* Use FNA as a replacement for XNA4. */
-        return 0;
+        return ASSEMBLY_SEARCH_MONOGAC;
 
     return ASSEMBLY_SEARCH_UNDEFINED;
 }
@@ -1840,6 +1854,26 @@ static MonoAssembly* CDECL wine_mono_assembly_preload_hook_v2_fn(MonoAssemblyNam
     else
         TRACE("skipping Windows GAC search due to override setting\n");
 
+    if (wine_mono_assembly_load_from_gac)
+    {
+        if (search_flags & ASSEMBLY_SEARCH_MONOGAC)
+        {
+            result = wine_mono_assembly_load_from_gac (aname, &stat, FALSE);
+
+            if (result)
+            {
+                TRACE("found in Mono GAC\n");
+                *flags |= WINE_PRELOAD_SET_GAC;
+                goto done;
+            }
+        }
+        else
+        {
+            *flags |= WINE_PRELOAD_SKIP_GAC;
+            TRACE("skipping Mono GAC search due to override setting\n");
+        }
+    }
+
     if ((search_flags & ASSEMBLY_SEARCH_PRIVATEPATH) == 0)
     {
         TRACE("skipping AppDomain search path due to override setting\n");