address most of the memory leaks (#149)

the param tree, siminterface log and SIM were not released handle all
but SIM for now
should reduce the memory leaks list dramatically

bochs/gui/siminterface.cc

@@ -345,15 +345,27 @@ bx_param_enum_c *bx_real_sim_c::get_param_enum(const char *pname, bx_param_c *ba
 void bx_init_siminterface()
 {
   if (SIM == NULL) {
+    SIM = new bx_real_sim_c();
+  }
+  if (siminterface_log == NULL) {
     siminterface_log = new logfunctions();
     siminterface_log->put("siminterface", "SIM");
-    SIM = new bx_real_sim_c();
   }
   if (root_param == NULL) {
     root_param = new bx_list_c(NULL,
       "bochs",
-      "list of top level bochs parameters"
-      );
+      "list of top level bochs parameters");
+  }
+}
+
+void bx_cleanup_siminterface()
+{
+  if (siminterface_log) {
+    delete siminterface_log;
+  }
+  if (root_param) {
+    root_param->clear();
+    root_param = NULL;
   }
 }
 
@@ -1073,9 +1085,9 @@ void bx_real_sim_c::init_statistics()
 
 void bx_real_sim_c::cleanup_statistics()
 {
-  bx_list_c *list;
+  bx_list_c *list = get_statistics_root();
 
-  if ((list = get_statistics_root()) != NULL) {
+  if (list != NULL) {
     list->clear();
   }
 }

bochs/gui/siminterface.h

@@ -770,6 +770,7 @@ class BOCHSAPI bx_simulator_interface_c {
 BOCHSAPI extern bx_simulator_interface_c *SIM;
 
 extern void bx_init_siminterface();
+extern void bx_cleanup_siminterface();
 
 #if defined(__WXMSW__) || defined(WIN32)
 // Just to provide HINSTANCE, etc. in files that have not included bochs.h.

bochs/main.cc

@@ -352,6 +352,7 @@ int bxmain(void)
 #endif
   plugin_cleanup();
   BX_INSTR_EXIT_ENV();
+  bx_cleanup_siminterface();
   return SIM->get_exit_code();
 }