Print a debugging message about registering literals as roots

Author: drmeister

src/gctools/boehmGarbageCollection.cc

@@ -572,6 +572,12 @@ void clasp_gc_registerRoots(void* rootsStart, size_t numberOfRoots) {
   void* rootsEnd = (void*)((uintptr_t)rootsStart + numberOfRoots * sizeof(void*));
   if (rootsEnd != rootsStart) {
     printf("%s:%d:%s GC_add_roots %p to %p\n", __FILE__, __LINE__, __FUNCTION__, rootsStart, rootsEnd);
+    void* base = GC_base(rootsStart);
+    if (base) {
+      printf("    ---- the roots are INSIDE GC managed memory - GC_add_roots is not needed\n");
+    } else {
+      printf("    ---- the roots are OUTSIDE GC managed memory - GC_add_roots is NEEDED\n");
+    }
     GC_add_roots(rootsStart, rootsEnd);
   }
 #endif