hellworld.cpp

#include "jsapi.h"

// Compile for OSX:
// /usr/bin/clang++ -I include -m32 -std=c++0x -g helloworld.cpp -lobjc libjs_static.a  -l z -l m

#include "jsapi.h"

/* The class of the global object. */
static JSClass global_class = {
    "global", 
    JSCLASS_GLOBAL_FLAGS,
    JS_PropertyStub, 
    JS_DeletePropertyStub, 
    JS_PropertyStub, 
    JS_StrictPropertyStub,
    JS_EnumerateStub,  
    JS_ResolveStub, 
    JS_ConvertStub
};

int main(int argc, const char *argv[])
{
    JSRuntime *rt;
    JSContext *cx;
    JS::RootedObject  *global;

    JS_Init();

    rt = JS_NewRuntime(8L * 1024 * 1024, JS_NO_HELPER_THREADS);
    if (rt == NULL)
        return 1;

    cx = JS_NewContext(rt, 8192);
    if (cx == NULL)
        return 1;

    global = new JS::RootedObject(cx, JS_NewGlobalObject(cx, &global_class, nullptr, JS::DontFireOnNewGlobalHook));
    if (global == NULL)
        return 1;

    const char *script = "'hello'+'world'";
    jsval rval;
    JSString *str;
    bool ok;
    const char *filename = "noname";
    int lineno = 0;

    {
      JSAutoCompartment ac(cx, *global); 

      ok = JS_EvaluateScript(cx, *global, script, strlen(script), filename, lineno, &rval);

      if (rval.isNull() | rval.isFalse() )
        return 1;
    }

    str = JSVAL_TO_STRING(rval);
    printf("%s\n", JS_EncodeString(cx, str));

    JS_DestroyContext(cx);
    JS_DestroyRuntime(rt);
    JS_ShutDown();
    return 0;
}