dom/script/ModuleScript.cpp
author Sylvestre Ledru <sledru@mozilla.com>
Fri, 30 Nov 2018 11:46:48 +0100
changeset 448947 6f3709b3878117466168c40affa7bca0b60cf75b
parent 441458 180eb0ea89bcf02d511d4e05f493583d125177ea
child 452397 8e6f86cd811a93cce70fc91ac6fbb93405aff803
permissions -rw-r--r--
Bug 1511181 - Reformat everything to the Google coding style r=ehsan a=clang-format # ignore-this-changeset

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "ModuleScript.h"
#include "mozilla/HoldDropJSObjects.h"
#include "ScriptLoader.h"

namespace mozilla {
namespace dom {

// A single module script.  May be used to satisfy multiple load requests.

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleScript)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ModuleScript)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
  tmp->UnlinkModuleRecord();
  tmp->mParseError.setUndefined();
  tmp->mErrorToRethrow.setUndefined();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ModuleScript)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ModuleScript)
  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mParseError)
  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mErrorToRethrow)
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleScript)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleScript)

ModuleScript::ModuleScript(ScriptLoader* aLoader, nsIURI* aBaseURL)
    : mLoader(aLoader), mBaseURL(aBaseURL), mSourceElementAssociated(false) {
  MOZ_ASSERT(mLoader);
  MOZ_ASSERT(mBaseURL);
  MOZ_ASSERT(!mModuleRecord);
  MOZ_ASSERT(!HasParseError());
  MOZ_ASSERT(!HasErrorToRethrow());
}

void ModuleScript::UnlinkModuleRecord() {
  // Remove module's back reference to this object request if present.
  if (mModuleRecord) {
    MOZ_ASSERT(JS::GetModulePrivate(mModuleRecord).toPrivate() == this);
    JS::SetModulePrivate(mModuleRecord, JS::UndefinedValue());
    mModuleRecord = nullptr;
  }
}

ModuleScript::~ModuleScript() {
  // The object may be destroyed without being unlinked first.
  UnlinkModuleRecord();
  DropJSObjects(this);
}

void ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord) {
  MOZ_ASSERT(!mModuleRecord);
  MOZ_ASSERT(!HasParseError());
  MOZ_ASSERT(!HasErrorToRethrow());

  mModuleRecord = aModuleRecord;

  // Make module's host defined field point to this module script object.
  // This is cleared in the UnlinkModuleRecord().
  JS::SetModulePrivate(mModuleRecord, JS::PrivateValue(this));
  HoldJSObjects(this);
}

void ModuleScript::SetParseError(const JS::Value& aError) {
  MOZ_ASSERT(!aError.isUndefined());
  MOZ_ASSERT(!HasParseError());
  MOZ_ASSERT(!HasErrorToRethrow());

  UnlinkModuleRecord();
  mParseError = aError;
  HoldJSObjects(this);
}

void ModuleScript::SetErrorToRethrow(const JS::Value& aError) {
  MOZ_ASSERT(!aError.isUndefined());
  MOZ_ASSERT(!HasErrorToRethrow());

  // This is only called after SetModuleRecord() or SetParseError() so we don't
  // need to call HoldJSObjects() here.
  MOZ_ASSERT(mModuleRecord || HasParseError());

  mErrorToRethrow = aError;
}

void ModuleScript::SetSourceElementAssociated() {
  MOZ_ASSERT(mModuleRecord);
  MOZ_ASSERT(!mSourceElementAssociated);

  mSourceElementAssociated = true;
}

}  // namespace dom
}  // namespace mozilla