/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "PerfMeasurement.h"
#include "jsperf.h"
#include "nsMemory.h"
#include "mozilla/Preferences.h"
#include "mozJSComponentLoader.h"
#include "nsZipArchive.h"
#include "xpc_make_class.h"

namespace mozilla {
namespace jsperf {

NS_IMPL_ISUPPORTS(Module, nsIXPCScriptable)

Module::Module() = default;

Module::~Module() = default;

#define XPC_MAP_CLASSNAME Module
#define XPC_MAP_QUOTED_CLASSNAME "Module"
#define XPC_MAP_FLAGS XPC_SCRIPTABLE_WANT_CALL
#include "xpc_map_end.h"

static bool SealObjectAndPrototype(JSContext* cx, JS::Handle<JSObject*> parent,
                                   const char* name) {
  JS::Rooted<JS::Value> prop(cx);
  if (!JS_GetProperty(cx, parent, name, &prop)) return false;

  if (prop.isUndefined()) {
    // Pretend we sealed the object.
    return true;
  }

  JS::Rooted<JSObject*> obj(cx, prop.toObjectOrNull());
  if (!JS_GetProperty(cx, obj, "prototype", &prop)) return false;

  JS::Rooted<JSObject*> prototype(cx, prop.toObjectOrNull());
  return JS_FreezeObject(cx, obj) && JS_FreezeObject(cx, prototype);
}

static bool InitAndSealPerfMeasurementClass(JSContext* cx,
                                            JS::Handle<JSObject*> global) {
  // Init the PerfMeasurement class
  if (!JS::RegisterPerfMeasurement(cx, global)) return false;

  // Seal up Object, Function, and Array and their prototypes.  (This single
  // object instance is shared amongst everyone who imports the jsperf module.)
  if (!SealObjectAndPrototype(cx, global, "Object") ||
      !SealObjectAndPrototype(cx, global, "Function") ||
      !SealObjectAndPrototype(cx, global, "Array"))
    return false;

  // Finally, seal the global object, for good measure. (But not recursively;
  // this breaks things.)
  return JS_FreezeObject(cx, global);
}

NS_IMETHODIMP
Module::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* obj,
             const JS::CallArgs& args, bool* _retval) {
  mozJSComponentLoader* loader = mozJSComponentLoader::Get();
  JS::Rooted<JSObject*> targetObj(cx);
  loader->FindTargetObject(cx, &targetObj);

  *_retval = InitAndSealPerfMeasurementClass(cx, targetObj);
  return NS_OK;
}

}  // namespace jsperf
}  // namespace mozilla