Quelle ProtectedData.cpp Sprache: C

/* -*- 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 "threading/ProtectedData.h"

#include "threading/Mutex.h"
#include "vm/HelperThreads.h"
#include "vm/JSContext.h"

namespace js {

#ifdef JS_HAS_PROTECTED_DATA_CHECKS

/* static */ mozilla::Atomic<size_t, mozilla::SequentiallyConsistent>
    AutoNoteSingleThreadedRegion::count(0);

template <AllowedHelperThread Helper>
static inline bool OnHelperThread() {
  if (Helper == AllowedHelperThread::IonCompile ||
      Helper == AllowedHelperThread::GCTaskOrIonCompile) {
    if (CurrentThreadIsOffThreadCompiling()) {
      return true;
    }
  }

  if (Helper == AllowedHelperThread::GCTask ||
      Helper == AllowedHelperThread::GCTaskOrIonCompile) {
    if (CurrentThreadIsPerformingGC()) {
      return true;
    }
  }

  return false;
}

void CheckThreadLocal::check() const {
  JSContext* cx = TlsContext.get();
  MOZ_ASSERT(cx);
  MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
  MOZ_ASSERT(id == ThreadId::ThisThreadId());
}

void CheckContextLocal::check() const {
  if (!cx_->isInitialized()) {
    return;
  }

  JSContext* cx = TlsContext.get();
  MOZ_ASSERT(cx);
  MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
  MOZ_ASSERT(cx_ == cx);
}

void CheckMutexHeld::check() const { mutex_.assertOwnedByCurrentThread(); }

template <AllowedHelperThread Helper>
void CheckMainThread<Helper>::check() const {
  if (OnHelperThread<Helper>()) {
    return;
  }

  JSContext* cx = TlsContext.get();
  MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
}

template class CheckMainThread<AllowedHelperThread::None>;
template class CheckMainThread<AllowedHelperThread::GCTask>;
template class CheckMainThread<AllowedHelperThread::IonCompile>;
template class CheckMainThread<AllowedHelperThread::GCTaskOrIonCompile>;

template <GlobalLock Lock, AllowedHelperThread Helper>
void CheckGlobalLock<Lock, Helper>::check() const {
  if (OnHelperThread<Helper>()) {
    return;
  }

  switch (Lock) {
    case GlobalLock::GCLock:
      TlsGCContext.get()
          ->runtimeFromAnyThread()
          ->gc.assertCurrentThreadHasLockedGC();
      break;
    case GlobalLock::HelperThreadLock:
      gHelperThreadLock.assertOwnedByCurrentThread();
      break;
  }
}

template class CheckGlobalLock<GlobalLock::GCLock, AllowedHelperThread::None>;
template class CheckGlobalLock<GlobalLock::HelperThreadLock,
                               AllowedHelperThread::None>;

#endif  // JS_HAS_PROTECTED_DATA_CHECKS

}  // namespace js

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