transform javascript to opcode using spidermonkey - code-analysis

Question

i am new to spider monkey and want to use it for transform java script file to sequence of byte code.
i get spider monkey and build it in debug mode.
i want to use JS_CompileScript function in jsapi.h to compile javascript code and analysis this to get bytecode , but when in compile below code and run it , i get run time error.
the error is "Unhandled exception at 0x0f55c020 (mozjs185-1.0.dll) in spiderMonkeyTest.exe: 0xC0000005: Access violation reading location 0x00000d4c." and i do not resolve it.
any body can help me to resolve this or introducing other solutions to get byte code from javascript code by using spider monkey ?
// spiderMonkeyTest.cpp : Defines the entry point for the console application.
//
#define XP_WIN
#include <iostream>
#include <fstream>
#include "stdafx.h"
#include "jsapi.h"
#include "jsanalyze.h"
using namespace std;
using namespace js;
static JSClass global_class = { "global",
JSCLASS_NEW_RESOLVE | JSCLASS_GLOBAL_FLAGS,
JS_PropertyStub,
NULL,
JS_PropertyStub,
JS_StrictPropertyStub,
JS_EnumerateStub,
JS_ResolveStub,
JS_ConvertStub,
NULL,
JSCLASS_NO_OPTIONAL_MEMBERS
};
int _tmain(int argc, _TCHAR* argv[]) {
/* Create a JS runtime. */
JSRuntime *rt = JS_NewRuntime(16L * 1024L * 1024L);
if (rt == NULL)
return 1;
/* Create a context. */
JSContext *cx = JS_NewContext(rt, 8192);
if (cx == NULL)
return 1;
JS_SetOptions(cx, JSOPTION_VAROBJFIX);
JSScript *script;
JSObject *obj;
const char *js = "function a() { var tmp; tmp = 1 + 2; temp = temp * 2; alert(tmp); return 1; }";
obj = JS_CompileScript(cx,JS_GetGlobalObject(cx),js,strlen(js),"code.js",NULL);
script = obj->getScript();
if (script == NULL)
return JS_FALSE; /* compilation error */
js::analyze::Script *sc = new js::analyze::Script();
sc->analyze(cx,script);
JS_DestroyContext(cx);
JS_DestroyRuntime(rt);
/* Shut down the JS engine. */
JS_ShutDown();
return 1;
}

Answer 1

Which version of Spidermonkey are you using? I am using the one that comes with FireFox 10 so the API may be different.
You should create a new global object and initialize it by calling JS_NewCompartmentAndGlobalObject() and JS_InitStandardClasses() before compiling your script :
.....
/*
* Create the global object in a new compartment.
* You always need a global object per context.
*/
global = JS_NewCompartmentAndGlobalObject(cx, &global_class, NULL);
if (global == NULL)
return 1;
/*
* Populate the global object with the standard JavaScript
* function and object classes, such as Object, Array, Date.
*/
if (!JS_InitStandardClasses(cx, global))
return 1;
......
Note, the function JS_NewCompartmentAndGlobalObject() is obsolete now, check the latest JSAPI documentation for the version your are using. Your JS_CompileScript() call just try to retrieve a global object which has not been created and probably this causes the exception.

Answer 2

how about using function "SaveCompiled" ? it will save object/op-code (compiled javascript) to file