From 1b16563e9f611f7d5e9607301f7115f12baf9183 Mon Sep 17 00:00:00 2001
From: Simon Cooksey <sjc80@kent.ac.uk>
Date: Mon, 22 Dec 2014 14:22:42 +0000
Subject: [PATCH] Fixed bug with re-running programs from xgdb

This could be better implemented, but post-run the structure in
reclaimUnreachableFunctions contains null ptrs, which causes
segmentation faults.

There's probably a better solution, but this works for now.
---
 lib/JIT.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/JIT.cpp b/lib/JIT.cpp
index 9a0ed40..fb6814e 100644
--- a/lib/JIT.cpp
+++ b/lib/JIT.cpp
@@ -291,9 +291,11 @@ void JITImpl::reclaimUnreachableFunctions(JITCoreInfo &coreInfo)
       info->fastFuncValue
     };
     for (LLVMValueRef f : functions) {
-      LLVMFreeMachineCodeForFunction(executionEngine, f);
-      LLVMReplaceAllUsesWith(f, LLVMGetUndef(LLVMTypeOf(f)));
-      LLVMDeleteFunction(f);
+      if(f){
+        LLVMFreeMachineCodeForFunction(executionEngine, f);
+        LLVMReplaceAllUsesWith(f, LLVMGetUndef(LLVMTypeOf(f)));
+        LLVMDeleteFunction(f);
+      }
     }
     info->fastFunc = nullptr;
     info->func = nullptr;