From dd9e1a4611465e75480ea9dc252ebdaae1816375 Mon Sep 17 00:00:00 2001
From: theraven <theraven@72102866-910b-0410-8b05-ffd578937521>
Date: Mon, 7 Jun 2010 00:28:52 +0000
Subject: [PATCH] Don't infinite loop when trying to send an unimplemented
 message to an object that doesn't implement -methodSignatureForSelector:

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@30593 72102866-910b-0410-8b05-ffd578937521
---
 Source/GSFFIInvocation.m | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Source/GSFFIInvocation.m b/Source/GSFFIInvocation.m
index 759cd1610..cc134dca6 100644
--- a/Source/GSFFIInvocation.m
+++ b/Source/GSFFIInvocation.m
@@ -147,7 +147,19 @@ static IMP gs_objc_msg_forward2 (id receiver, SEL sel)
   NSMethodSignature     *sig;
   GSCodeBuffer          *memory;
 
-  sig = [receiver methodSignatureForSelector: sel];
+  if (class_respondsToSelector(receiver->isa, sel))
+    {
+      sig = [receiver methodSignatureForSelector: sel];
+    }
+  else
+    {
+      [NSException raise: NSInvalidArgumentException
+		   format: @"GSFFIInvocation: Class '%s'(%s) does not respond"
+		           @" to forwardInvocation: for '%s'",
+		   GSClassNameFromObject(receiver),
+		   GSObjCIsInstance(receiver) ? "instance" : "class",
+		   sel ? sel_getName(sel) : "(null)"];
+    }
 
   if (sig == nil)
     {