Subj : Help with embedding spidermonkey please!!!
To   : netscape.public.mozilla.jseng
From : "Blacksage" <blacksage@hotdak.net>
Date : Sat Nov 08 2003 10:47 pm

Hey,

We have been attempting to embed Spidermonkey into an application for some
time now, and are failing miserably. We have inserted the engine into the
app with little difficulty, it initialises and runs scripts fine, however it
doesn't cleanup properly and results in dumping of a heap of memory (which
we believe is likely the remnants of the java standard classes). The
application is being developed in wxWindows, however for simplicity sake we
have the code in a small .cpp below for you to see:

#ifndef LEAKDETECT_H_
#define LEAKDETECT_H_
 #if defined(_DEBUG) && defined(_MSC_VER) && (_MSC_VER >= 1000)

  #include <crtdbg.h>
  #pragma warning(disable:4514)

  static int enable_crt_debug()
  {
   return _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
  }

  int crt_debug_result = enable_crt_debug();

 #endif
#endif

#define XP_WIN

#include <iostream>
using namespace std;

#include "js/jsapi.h"

class ScriptEngine
{
 public:
  ScriptEngine();
  ~ScriptEngine();

 JSRuntime *m_JSRunTime;
 JSContext *m_JSContext;
 JSObject  *m_GlobalObject;
};

ScriptEngine::ScriptEngine()
{
 cout << "Contstructor Start" << endl;

 m_JSRunTime = NULL;
 m_JSContext = NULL;
 m_GlobalObject = NULL;

 m_JSRunTime = JS_NewRuntime(4 * 1024 * 1024);
 m_JSContext = JS_NewContext(m_JSRunTime,  8 * 1024);

 JSClass globalClass =
 {
  "Global", 0,
  JS_PropertyStub,  JS_PropertyStub,
  JS_PropertyStub, JS_PropertyStub,
  JS_EnumerateStub, JS_ResolveStub,
  JS_ConvertStub,  JS_FinalizeStub
 };

 m_GlobalObject = JS_NewObject(m_JSContext, &globalClass, NULL, NULL);
 JS_InitStandardClasses(m_JSContext, m_GlobalObject);

 cout << "Contstructor End" << endl;

}

ScriptEngine::~ScriptEngine()
{
 cout << "Destructor Start" << endl;

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

 JS_DestroyRuntime(m_JSRunTime);
 m_JSRunTime = NULL;

 JS_ShutDown();

 cout << "Destructor End" << endl;
}

int main()
{
 ScriptEngine *cScriptEngine;
 cScriptEngine = new ScriptEngine();

 delete cScriptEngine;
 cScriptEngine = NULL;

 return 0;
}

Upon creating this .cpp it doesnt even run to instead breaking during
calling  JS_DeleteContext.
Wehave tried virtually everything we can think of, its almost as if the
context is lost or something. For example take the code from the destructor,
and place it directly folloing the last line of the constructor, and
everything works fine...
If you have any ideas whats happening we would be greatly appreciative!


Kingsley

.