From 588cf8382f6194d3c3eb6f09e17a1be73f5d2cda Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Mon, 9 Nov 2015 09:41:39 +0000
Subject: [PATCH] GNUstep does not export object_getClass *sigh* :(.

---
 Execute.cpp           |  4 ++++
 JavaScript.hpp        |  2 ++
 ObjectiveC/Library.mm | 21 +++++++++++++++++----
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/Execute.cpp b/Execute.cpp
index 1c7b833..deaeeda 100644
--- a/Execute.cpp
+++ b/Execute.cpp
@@ -261,6 +261,10 @@ JSObjectRef CYMakeStruct(JSContextRef context, void *data, sig::Type *type, ffi_
 }
 
 static void *CYCastSymbol(const char *name) {
+    for (CYHook *hook : GetHooks())
+        if (hook->CastSymbol != NULL)
+            if (void *value = (*hook->CastSymbol)(name))
+                return value;
     return dlsym(RTLD_DEFAULT, name);
 }
 
diff --git a/JavaScript.hpp b/JavaScript.hpp
index e4af17b..0a3c431 100644
--- a/JavaScript.hpp
+++ b/JavaScript.hpp
@@ -131,6 +131,8 @@ struct CYHook {
 
     bool (*PoolFFI)(CYPool *, JSContextRef, sig::Type *, ffi_type *, void *, JSValueRef);
     JSValueRef (*FromFFI)(JSContextRef, sig::Type *, ffi_type *, void *, bool, JSObjectRef);
+
+    void *(*CastSymbol)(const char *);
 };
 
 struct CYRegisterHook {
diff --git a/ObjectiveC/Library.mm b/ObjectiveC/Library.mm
index bd2946a..e012757 100644
--- a/ObjectiveC/Library.mm
+++ b/ObjectiveC/Library.mm
@@ -2336,11 +2336,14 @@ JSValueRef CYSendMessage(CYPool &pool, JSContextRef context, id self, Class _cla
         imp = NULL;
 
         CYPoolTry {
-            NSMethodSignature *method([self methodSignatureForSelector:_cmd]);
-            if (method == nil)
-                throw CYJSError(context, "unrecognized selector %s sent to object %p", sel_getName(_cmd), self);
-            type = CYPoolCString(pool, context, [method _typeString]);
+            if (NSMethodSignature *method = [self methodSignatureForSelector:_cmd])
+                type = CYPoolCString(pool, context, [method _typeString]);
+            else
+                type = NULL;
         } CYPoolCatch(NULL)
+
+        if (type == NULL)
+            throw CYJSError(context, "unrecognized selector %s sent to object %p", sel_getName(_cmd), self);
     }
 
     void *setup[2];
@@ -2961,6 +2964,15 @@ void CYObjectiveC_SetupContext(JSContextRef context) { CYPoolTry {
     CYSetPrototype(context, CYCastJSObject(context, CYGetProperty(context, Selector, prototype_s)), Function_prototype);
 } CYPoolCatch() }
 
+static void *CYObjectiveC_CastSymbol(const char *name) {
+    if (false);
+#ifdef __GNU_LIBOBJC__
+    else if (strcmp(name, "object_getClass") == 0)
+        return reinterpret_cast<void *>(&object_getClass);
+#endif
+    return NULL;
+}
+
 static CYHook CYObjectiveCHook = {
     &CYObjectiveC_ExecuteStart,
     &CYObjectiveC_ExecuteEnd,
@@ -2969,6 +2981,7 @@ static CYHook CYObjectiveCHook = {
     &CYObjectiveC_SetupContext,
     &CYObjectiveC_PoolFFI,
     &CYObjectiveC_FromFFI,
+    &CYObjectiveC_CastSymbol,
 };
 
 CYRegisterHook CYObjectiveC(&CYObjectiveCHook);
-- 
2.49.0