[wasm] Transferrable modules

src/value-serializer.cc

Index: src/value-serializer.cc
diff --git a/src/value-serializer.cc b/src/value-serializer.cc
index 7b17275b014d5a9f210ad1d63e6fae134bddc840..603a43779827dd56b54337f5a5bf889f7bc67fb2 100644
--- a/src/value-serializer.cc
+++ b/src/value-serializer.cc
@@ -126,6 +126,8 @@ enum class SerializationTag : uint8_t {
   //  wasmWireByteLength:uint32_t, then raw data
   //  compiledDataLength:uint32_t, then raw data
   kWasmModule = 'W',
+  // A wasm module object transfer. next value is its index.
+  kWasmModuleTransfer = 'w',
   // The delegate is responsible for processing all following data.
   // This "escapes" to whatever wire format the delegate chooses.
   kHostObject = '\\',
@@ -803,6 +805,18 @@ Maybe<bool> ValueSerializer::WriteJSArrayBufferView(JSArrayBufferView* view) {
 }
 
 Maybe<bool> ValueSerializer::WriteWasmModule(Handle<JSObject> object) {
+  if (delegate_ != nullptr) {
+    Maybe<uint32_t> transfer_id = delegate_->GetWasmModuleTransferId(
+        reinterpret_cast<v8::Isolate*>(isolate_),
+        v8::Local<v8::WasmCompiledModule>::Cast(Utils::ToLocal(object)));
+    uint32_t id = 0;
+    if (transfer_id.To(&id)) {
+      WriteTag(SerializationTag::kWasmModuleTransfer);
+      WriteVarint<uint32_t>(id);
+      return Just(true);
+    }
+  }
+
   Handle<WasmCompiledModule> compiled_part(
       WasmCompiledModule::cast(object->GetInternalField(0)), isolate_);
   WasmEncodingTag encoding_tag = WasmEncodingTag::kRawBytes;
@@ -1150,6 +1164,8 @@ MaybeHandle<Object> ValueDeserializer::ReadObjectInternal() {
     }
     case SerializationTag::kWasmModule:
       return ReadWasmModule();
+    case SerializationTag::kWasmModuleTransfer:
+      return ReadWasmModuleTransfer();
     case SerializationTag::kHostObject:
       return ReadHostObject();
     default:
@@ -1595,8 +1611,24 @@ MaybeHandle<JSArrayBufferView> ValueDeserializer::ReadJSArrayBufferView(
   return typed_array;
 }
 
-MaybeHandle<JSObject> ValueDeserializer::ReadWasmModule() {
+MaybeHandle<JSObject> ValueDeserializer::ReadWasmModuleTransfer() {
   if (FLAG_wasm_disable_structured_cloning) return MaybeHandle<JSObject>();
+  uint32_t index = 0;
+  v8::Local<v8::Value> module;
+  if (delegate_ != nullptr && ReadVarint<uint32_t>().To(&index) &&
+      delegate_
+          ->GetWasmModuleFromId(reinterpret_cast<v8::Isolate*>(isolate_), index)
+          .ToLocal(&module)) {
+    return Handle<JSObject>::cast(Utils::OpenHandle(*module));
+  } else {
+    return MaybeHandle<JSObject>();
+  }
+}
+
+MaybeHandle<JSObject> ValueDeserializer::ReadWasmModule() {
+  if (FLAG_wasm_disable_structured_cloning || delegate_ == nullptr ||
+      !delegate_->AllowInlineWasm())
+    return MaybeHandle<JSObject>();
 
   Vector<const uint8_t> encoding_tag;
   if (!ReadRawBytes(sizeof(WasmEncodingTag)).To(&encoding_tag) ||