v8 Persistent SetWeak 崩溃 NEAR_DEATH

Question

我的代码：

struct WeakData {
    context* c;
    std::vector<UniquePersistent<Object>>::iterator i;
};

void WeakPtrCallback(const v8::WeakCallbackData<v8::Object, WeakData>& data) {
    printf("weak callback");
    fflush(stdout);
    // crashes always after exit from this callback
}

Local<Object> wrapDocumentSelection(Isolate* isolate, cDocumentSelection* selection) {
    EscapableHandleScope handle_scope(isolate);
    auto ctx = isolate->GetCurrentContext();
    Context::Scope context_scope(ctx);

    Local<External> contextWrap = Local<External>::Cast(
            Handle<Object>::Cast(isolate->GetCurrentContext()->Global()->GetPrototype())->GetInternalField(0));
    context* c = static_cast<context*>(contextWrap->Value());

    Local<ObjectTemplate> documentSelectionTemplate = Local<ObjectTemplate>::New(isolate, c->documentSelectionTemplate);

    Local<Object> jsSelection = documentSelectionTemplate->NewInstance(ctx).ToLocalChecked();
    jsSelection->SetInternalField(0, External::New(isolate, selection));
    jsSelection->Set(ctx, String::NewFromUtf8(isolate, "length"), Integer::New(isolate, selection->Length));

    c->trackingObjects.push_back(UniquePersistent<Object>(isolate, jsSelection));
    auto &p = c->trackingObjects.back();
    auto it = c->trackingObjects.end();
    it--;

    WeakData* wd = new WeakData;
    wd->c = c;
    wd->i = it;

    p.Reset(isolate, jsSelection);
    p.SetWeak<WeakData>(NULL, WeakPtrCallback);
    isolate->AdjustAmountOfExternalAllocatedMemory(1024);

    return handle_scope.Escape(jsSelection);
}

在上下文中，我保留了所有持久句柄的向量，同时在 WeakPtrCallback 中，我需要清理一些外部分配的资源

v8 错误：

#
# Fatal error in ../src/global-handles.cc, line 325
# Check failed: state() != NEAR_DEATH.
#

关于 https://strongloop.com/strongblog/node-js-v0-12-c-apis-breaking/ 我不需要在回调中执行任何与 v8 相关的清理

The persistent's storage cell is automatically disposed. Keep a reference to the original v8::Persistent if you want to revive it with .ClearWeak().

我也尝试使用 Persistent 和 Persistent<Value, CopyablePersistentTraits<Value>> - 同样的错误... 有什么建议吗？

Answer 1

好吧，看来我的C++不够好我找到了向量问题，由于某种原因它无法正确删除所需的元素，我猜迭代器是 index-bound，因此删除一些先前的元素会破坏所有进一步的迭代器引用...

切换到 std::map 以不断递增的计数器作为关键完全解决了问题

v8 Persistent SetWeak 崩溃 NEAR_DEATH

v8 Persistent SetWeak crashed with NEAR_DEATH

javascript

c++

memory-leaks

v8