Subj : SpiderMonkey: Run script from within script
To   : netscape.public.mozilla.jseng
From : "Franky Braem" <fa225992@skynet.be>
Date : Wed Mar 19 2003 10:16 pm

Hi,

In my embedding project (wxJS), I want to create a wxScript-object which
give the developer the possible to load and run a script from another
script. I provide 2 ways of running a script:

1. Using the wxScript constructor function

The script is compiled, executed and destroyed

2. Using the wxScript object

The source of the script is loaded on construction. The script is executed
by calling the run-method of wxScript. The first time run is called, the
script is compiled and store it in a script object. The next runs reuse the
compiled script.

1 works fine. 2 gives me memory leaks when I exit the application.

The code is as follows:

JSBool wxJSScript::run(JSContext *cx, JSObject *obj, uintN argc, jsval
*argv, jsval *rval)
{
 wxJSScript *p = (wxJSScript *) JS_GetPrivate(cx, obj);
 p->Execute(cx, rval);
 return JS_TRUE;
}

JSBool wxJSScript::Execute(JSContext *cx, jsval *rval)
{
 JSObject *objGlobal = JS_GetGlobalObject(cx);
 if ( m_script == NULL ) // Not compiled yet
 {
  // Compile script
  m_script = JS_CompileScript(cx, objGlobal, m_source.c_str(),
            m_source.length(), m_url.c_str(), 0);
  if ( m_script == NULL )
  {
   *rval = JSVAL_FALSE;
   return JS_FALSE;
  }
  else // On Success root it !
  {
   m_objScript = JS_NewScriptObject(cx, m_script);
   JS_AddNamedRoot(cx, &m_objScript, "script");
  }
 }

 // Each script needs its own context.
 // When performance is a problem, we probably need a context pool
    if ( m_cx == NULL )
 {
  m_cx = JS_NewContext(JS_GetRuntime(cx), WXJS_CONTEXT_SIZE);
  JS_SetGlobalObject(m_cx, objGlobal);
 }

 JS_ExecuteScript(m_cx, objGlobal, m_script, rval);

 if ( m_cx )
 {
  JS_DestroyContext(m_cx);
  m_cx = NULL;
 }

 return JS_TRUE;
}

The root is removed in the destructor callback of wxScript.

Hope somebody can help me to solve this.

Franky.

.