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worker: add
SharedArrayBuffer sharing
Logic is added to the `MessagePort` mechanism that attaches hidden objects to those instances when they are transferred that track their lifetime and maintain a reference count, to make sure that memory is freed at the appropriate times. Thanks to Stephen Belanger for reviewing this change in its original PR. Refs: ayojs/ayo#106 PR-URL: #20876 Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Shingo Inoue <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Tiancheng "Timothy" Gu <[email protected]> Reviewed-By: John-David Dalton <[email protected]> Reviewed-By: Gus Caplan <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| #include "sharedarraybuffer_metadata.h" | ||
| #include "base_object.h" | ||
| #include "base_object-inl.h" | ||
| #include "node_errors.h" | ||
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|
||
| using v8::Context; | ||
| using v8::Function; | ||
| using v8::FunctionTemplate; | ||
| using v8::Local; | ||
| using v8::Maybe; | ||
| using v8::MaybeLocal; | ||
| using v8::Nothing; | ||
| using v8::Object; | ||
| using v8::SharedArrayBuffer; | ||
| using v8::Value; | ||
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| namespace node { | ||
| namespace worker { | ||
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| namespace { | ||
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| // Yield a JS constructor for SABLifetimePartner objects in the form of a | ||
| // standard API object, that has a single field for containing the raw | ||
| // SABLiftimePartner* pointer. | ||
| Local<Function> GetSABLifetimePartnerConstructor( | ||
| Environment* env, Local<Context> context) { | ||
| Local<FunctionTemplate> templ; | ||
| templ = env->sab_lifetimepartner_constructor_template(); | ||
| if (!templ.IsEmpty()) | ||
| return templ->GetFunction(context).ToLocalChecked(); | ||
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| templ = BaseObject::MakeLazilyInitializedJSTemplate(env); | ||
| templ->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), | ||
| "SABLifetimePartner")); | ||
| env->set_sab_lifetimepartner_constructor_template(templ); | ||
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| return GetSABLifetimePartnerConstructor(env, context); | ||
| } | ||
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| class SABLifetimePartner : public BaseObject { | ||
| public: | ||
| SABLifetimePartner(Environment* env, | ||
| Local<Object> obj, | ||
| SharedArrayBufferMetadataReference r) | ||
| : BaseObject(env, obj), | ||
| reference(r) { | ||
| MakeWeak(); | ||
| } | ||
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| SharedArrayBufferMetadataReference reference; | ||
| }; | ||
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| } // anonymous namespace | ||
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| SharedArrayBufferMetadataReference | ||
| SharedArrayBufferMetadata::ForSharedArrayBuffer( | ||
| Environment* env, | ||
| Local<Context> context, | ||
| Local<SharedArrayBuffer> source) { | ||
| Local<Value> lifetime_partner; | ||
|
|
||
| if (!source->GetPrivate(context, | ||
| env->sab_lifetimepartner_symbol()) | ||
| .ToLocal(&lifetime_partner)) { | ||
| return nullptr; | ||
| } | ||
|
|
||
| if (lifetime_partner->IsObject() && | ||
| env->sab_lifetimepartner_constructor_template() | ||
| ->HasInstance(lifetime_partner)) { | ||
| CHECK(source->IsExternal()); | ||
| SABLifetimePartner* partner = | ||
| Unwrap<SABLifetimePartner>(lifetime_partner.As<Object>()); | ||
| CHECK_NE(partner, nullptr); | ||
| return partner->reference; | ||
| } | ||
|
|
||
| if (source->IsExternal()) { | ||
| // If this is an external SharedArrayBuffer but we do not see a lifetime | ||
| // partner object, it was not us who externalized it. In that case, there | ||
| // is no way to serialize it, because it's unclear how the memory | ||
| // is actually owned. | ||
| THROW_ERR_TRANSFERRING_EXTERNALIZED_SHAREDARRAYBUFFER(env); | ||
| return nullptr; | ||
| } | ||
|
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| SharedArrayBuffer::Contents contents = source->Externalize(); | ||
| SharedArrayBufferMetadataReference r(new SharedArrayBufferMetadata( | ||
| contents.Data(), contents.ByteLength())); | ||
| if (r->AssignToSharedArrayBuffer(env, context, source).IsNothing()) | ||
| return nullptr; | ||
| return r; | ||
| } | ||
|
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| Maybe<bool> SharedArrayBufferMetadata::AssignToSharedArrayBuffer( | ||
| Environment* env, Local<Context> context, | ||
| Local<SharedArrayBuffer> target) { | ||
| CHECK(target->IsExternal()); | ||
| Local<Function> ctor = GetSABLifetimePartnerConstructor(env, context); | ||
| Local<Object> obj; | ||
| if (!ctor->NewInstance(context).ToLocal(&obj)) | ||
| return Nothing<bool>(); | ||
|
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| new SABLifetimePartner(env, obj, shared_from_this()); | ||
| return target->SetPrivate(context, | ||
| env->sab_lifetimepartner_symbol(), | ||
| obj); | ||
| } | ||
|
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| SharedArrayBufferMetadata::SharedArrayBufferMetadata(void* data, size_t size) | ||
| : data(data), size(size) { } | ||
|
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| SharedArrayBufferMetadata::~SharedArrayBufferMetadata() { | ||
| free(data); | ||
| } | ||
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| MaybeLocal<SharedArrayBuffer> SharedArrayBufferMetadata::GetSharedArrayBuffer( | ||
| Environment* env, Local<Context> context) { | ||
| Local<SharedArrayBuffer> obj = | ||
| SharedArrayBuffer::New(env->isolate(), data, size); | ||
|
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| if (AssignToSharedArrayBuffer(env, context, obj).IsNothing()) | ||
| return MaybeLocal<SharedArrayBuffer>(); | ||
|
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| return obj; | ||
| } | ||
|
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| } // namespace worker | ||
| } // namespace node |
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