xpcom/base/nsISupportsImpl.cpp
author Simon Sapin <simon.sapin@exyr.org>
Mon, 31 Dec 2018 01:01:49 +0100
changeset 452667 91e7ea77c846ae753fb3a28ab81598d2dc7ac865
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
child 454354 5f4630838d46dd81dadb13220a4af0da9e23a619
permissions -rw-r--r--
Bug 1518045 - Publish selectors 0.21.0 on crates.io. r=emilio This cherry-picks https://github.com/servo/servo/pull/22577, with the relevant lockfile update.

/* -*- 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 "nsISupportsImpl.h"
#include "mozilla/Assertions.h"
#ifdef MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED
#include "nsThreadUtils.h"
#endif  // MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED

using namespace mozilla;

nsresult NS_FASTCALL NS_TableDrivenQI(void* aThis, REFNSIID aIID,
                                      void** aInstancePtr,
                                      const QITableEntry* aEntries) {
  do {
    if (aIID.Equals(*aEntries->iid)) {
      nsISupports* r = reinterpret_cast<nsISupports*>(
          reinterpret_cast<char*>(aThis) + aEntries->offset);
      NS_ADDREF(r);
      *aInstancePtr = r;
      return NS_OK;
    }

    ++aEntries;
  } while (aEntries->iid);

  *aInstancePtr = nullptr;
  return NS_ERROR_NO_INTERFACE;
}

#ifdef MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED
nsAutoOwningThread::nsAutoOwningThread() : mThread(GetCurrentVirtualThread()) {}

void nsAutoOwningThread::AssertCurrentThreadOwnsMe(const char* msg) const {
  if (MOZ_UNLIKELY(!IsCurrentThread())) {
    // `msg` is a string literal by construction.
    MOZ_CRASH_UNSAFE_OOL(msg);
  }
}

bool nsAutoOwningThread::IsCurrentThread() const {
  return mThread == GetCurrentVirtualThread();
}
#endif