From a6f716c8a2c2640c88131bcf9bc628f700993da7 Mon Sep 17 00:00:00 2001
From: Stephen Seo <seo.disparate@gmail.com>
Date: Tue, 12 Nov 2024 20:02:47 +0900
Subject: [PATCH] Add checks/output-stats for NULL-ptr frees

---
 src/another_memcheck.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/another_memcheck.cc b/src/another_memcheck.cc
index 761342a..a0f5cd8 100644
--- a/src/another_memcheck.cc
+++ b/src/another_memcheck.cc
@@ -15,6 +15,7 @@ namespace SC_AM_Internal {
   Stats *stats = nullptr;
   int is_env_status = 0;
   unsigned long long Malloced::count = 0;
+  unsigned long long null_count = 0;
 
   Stats *get_init_stats() {
     Stats *stats = reinterpret_cast<SC_AM_Internal::Stats*>(
@@ -184,11 +185,14 @@ namespace SC_AM_Internal {
 
     if (ptr) {
       if (!ListNode::remove_from_list(malloced_list_head, ptr)) {
-        std::clog << "WARNING: Attempted free of unknown memory location!\n";
+        std::clog << "\nWARNING: Attempted free of unknown memory location!";
       } else {
         result = true;
         real_free(ptr);
       }
+    } else {
+      std::clog << "\nWARNING: Attempted to free a NULL ptr!";
+      ++null_count;
     }
 
     ((std::recursive_mutex*)recursive_mutex)->unlock();
@@ -210,6 +214,7 @@ namespace SC_AM_Internal {
           << " id " << node->data->id << '\n';
       }
     }
+    std::clog << "Attempted to free a NULL ptr " <<  null_count << " times.\n";
   }
 }