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src: support serialization of binding data
This patch adds the SnapshotableObject interface. Native objects supporting serialization can inherit from it, implementing PrepareForSerialization(), Serialize() and Deserialize() to control how the native states should be serialized and deserialized. See doc: https://docs.google.com/document/d/15bu038I36oILq5t4Qju1sS2nKudVB6NSGWz00oD48Q8/edit PR-URL: #36943 Fixes: #35930 Refs: #35711 Reviewed-By: James M Snell <jasnell@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,39 +1,134 @@ | ||
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| #include "node_snapshotable.h" | ||
| #include "base_object-inl.h" | ||
| #include "debug_utils-inl.h" | ||
| #include "node_file.h" | ||
| #include "node_v8.h" | ||
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| namespace node { | ||
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| using v8::Local; | ||
| using v8::Object; | ||
| using v8::SnapshotCreator; | ||
| using v8::StartupData; | ||
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| SnapshotableObject::SnapshotableObject(Environment* env, | ||
| Local<Object> wrap, | ||
| EmbedderObjectType type) | ||
| : BaseObject(env, wrap), type_(type) { | ||
| set_is_snapshotable(true); | ||
| } | ||
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| const char* SnapshotableObject::GetTypeNameChars() const { | ||
| switch (type_) { | ||
| #define V(PropertyName, NativeTypeName) \ | ||
| case EmbedderObjectType::k_##PropertyName: { \ | ||
| return NativeTypeName::type_name.c_str(); \ | ||
| } | ||
| SERIALIZABLE_OBJECT_TYPES(V) | ||
| #undef V | ||
| default: { UNREACHABLE(); } | ||
| } | ||
| } | ||
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| bool IsSnapshotableType(FastStringKey key) { | ||
| #define V(PropertyName, NativeTypeName) \ | ||
| if (key == NativeTypeName::type_name) { \ | ||
| return true; \ | ||
| } | ||
| SERIALIZABLE_OBJECT_TYPES(V) | ||
| #undef V | ||
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| return false; | ||
| } | ||
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| void DeserializeNodeInternalFields(Local<Object> holder, | ||
| int index, | ||
| v8::StartupData payload, | ||
| StartupData payload, | ||
| void* env) { | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "Deserialize internal field %d of %p, size=%d\n", | ||
| static_cast<int>(index), | ||
| (*holder), | ||
| static_cast<int>(payload.raw_size)); | ||
| if (payload.raw_size == 0) { | ||
| holder->SetAlignedPointerInInternalField(index, nullptr); | ||
| return; | ||
| } | ||
| // No embedder object in the builtin snapshot yet. | ||
| UNREACHABLE(); | ||
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| Environment* env_ptr = static_cast<Environment*>(env); | ||
| const InternalFieldInfo* info = | ||
| reinterpret_cast<const InternalFieldInfo*>(payload.data); | ||
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| switch (info->type) { | ||
| #define V(PropertyName, NativeTypeName) \ | ||
| case EmbedderObjectType::k_##PropertyName: { \ | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, \ | ||
| "Object %p is %s\n", \ | ||
| (*holder), \ | ||
| NativeTypeName::type_name.c_str()); \ | ||
| env_ptr->EnqueueDeserializeRequest( \ | ||
| NativeTypeName::Deserialize, holder, index, info->Copy()); \ | ||
| break; \ | ||
| } | ||
| SERIALIZABLE_OBJECT_TYPES(V) | ||
| #undef V | ||
| default: { UNREACHABLE(); } | ||
| } | ||
| } | ||
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| StartupData SerializeNodeContextInternalFields(Local<Object> holder, | ||
| int index, | ||
| void* env) { | ||
| void* ptr = holder->GetAlignedPointerFromInternalField(index); | ||
| if (ptr == nullptr || ptr == env) { | ||
| return StartupData{nullptr, 0}; | ||
| } | ||
| if (ptr == env && index == ContextEmbedderIndex::kEnvironment) { | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "Serialize internal field, index=%d, holder=%p\n", | ||
| static_cast<int>(index), | ||
| *holder); | ||
| void* ptr = holder->GetAlignedPointerFromInternalField(BaseObject::kSlot); | ||
| if (ptr == nullptr) { | ||
| return StartupData{nullptr, 0}; | ||
| } | ||
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| // No embedder objects in the builtin snapshot yet. | ||
| UNREACHABLE(); | ||
| return StartupData{nullptr, 0}; | ||
| DCHECK(static_cast<BaseObject*>(ptr)->is_snapshotable()); | ||
| SnapshotableObject* obj = static_cast<SnapshotableObject*>(ptr); | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "Object %p is %s, ", | ||
| *holder, | ||
| obj->GetTypeNameChars()); | ||
| InternalFieldInfo* info = obj->Serialize(index); | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "payload size=%d\n", | ||
| static_cast<int>(info->length)); | ||
| return StartupData{reinterpret_cast<const char*>(info), | ||
| static_cast<int>(info->length)}; | ||
| } | ||
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| void SerializeBindingData(Environment* env, | ||
| SnapshotCreator* creator, | ||
| EnvSerializeInfo* info) { | ||
| size_t i = 0; | ||
| env->ForEachBindingData([&](FastStringKey key, | ||
| BaseObjectPtr<BaseObject> binding) { | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "Serialize binding %i, %p, type=%s\n", | ||
| static_cast<int>(i), | ||
| *(binding->object()), | ||
| key.c_str()); | ||
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| if (IsSnapshotableType(key)) { | ||
| size_t index = creator->AddData(env->context(), binding->object()); | ||
| per_process::Debug(DebugCategory::MKSNAPSHOT, | ||
| "Serialized with index=%d\n", | ||
| static_cast<int>(index)); | ||
| info->bindings.push_back({key.c_str(), i, index}); | ||
| SnapshotableObject* ptr = static_cast<SnapshotableObject*>(binding.get()); | ||
| ptr->PrepareForSerialization(env->context(), creator); | ||
| } else { | ||
| UNREACHABLE(); | ||
| } | ||
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| i++; | ||
| }); | ||
| } | ||
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| } // namespace node |
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