From: Christophe Thiéry <christopho128@gmail.com>
Date: Thu, 10 Nov 2011 13:13:31 +0000 (+0100)
Subject: Don't protect access to the metatable from Lua.
X-Git-Tag: exp_20120216~345
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/efd201684c340bfd7508b656bdbc59f57e7e7c67?hp=d2d9f8b0f434e881d124d81f655fc9ebb6f31199

Don't protect access to the metatable from Lua.

Lua code can never change the metatable of a userdata anyway
(setmetatable is possible only for a table).
getmetatable is now allowed for tasks and hosts: it's harmless and lets
people extend them.
---

diff --git a/src/bindings/lua/simgrid_lua.c b/src/bindings/lua/simgrid_lua.c
index 9de044a556..3496588228 100644
--- a/src/bindings/lua/simgrid_lua.c
+++ b/src/bindings/lua/simgrid_lua.c
@@ -858,12 +858,6 @@ static void register_task_functions(lua_State* L) {
   // writing doesn't work
   lua_setfield(L, -2, "__index");
                                   /* simgrid.task mt */
-  lua_pushliteral(L, "__metatable");
-                                  /* simgrid.task mt "__metatable" */
-  lua_pushnumber(L, 0);
-                                  /* simgrid.task mt "__metatable" 0 */
-  /* protect the metatable from Lua code (by setting any value to __metatable) */
-  lua_rawset(L, -3);              /* simgrid.task mt */
   lua_pop(L, 2);
                                   /* -- */
 }
@@ -896,12 +890,6 @@ static void register_host_functions(lua_State* L) {
   // FIXME: cannot work currently, same problem as tasks
   lua_setfield(L, -2, "__index");
                                   /* simgrid.host mt */
-  lua_pushliteral(L, "__metatable");
-                                  /* simgrid.host mt "__metatable" */
-  lua_pushnumber(L, 0);
-                                  /* simgrid.host mt "__metatable" 0 */
-  /* protect the metatable from Lua code (by setting any value to __metatable) */
-  lua_rawset(L, -3);              /* simgrid.host mt */
   lua_pop(L, 2);
                                   /* -- */
 }