src: zero-initialize data that are copied into the snapshot · nodejs/node@584beaa

// To serialize the type field, save data in a EmbedderTypeInfo.

if (index == BaseObject::kEmbedderType) {

int size = sizeof(EmbedderTypeInfo);

char* data = new char[size];

// We need to use placement new because V8 calls delete[] on the returned

// data.

// The () syntax at the end would zero-initialize the block and make

// the padding reproducible.

char* data = new char[size]();

// TODO(joyeecheung): support cppgc objects.

new (data) EmbedderTypeInfo(obj->type(),

EmbedderTypeInfo::MemoryMode::kBaseObject);

std::is_same_v<InternalFieldInfoBase, T>,

"Can only accept InternalFieldInfoBase subclasses");

void* buf = ::operator new[](sizeof(T));

memset(buf, 0, sizeof(T)); // Make the padding reproducible.

T* result = new (buf) T;

result->type = type;

result->length = sizeof(T);