1 files changed, 49 insertions, 0 deletions
diff --git a/src/bun.js/bindings/Serialization.cpp b/src/bun.js/bindings/Serialization.cpp
new file mode 100644
index 000000000..89937ebbb
--- /dev/null
+++ b/src/bun.js/bindings/Serialization.cpp
@@ -0,0 +1,49 @@
+#include "root.h"
+#include "headers-handwritten.h"
+#include "ExceptionOr.h"
+#include "MessagePort.h"
+#include "SerializedScriptValue.h"
+#include "JSDOMExceptionHandling.h"
+
+using namespace JSC;
+using namespace WebCore;
+
+/// This is used for Bun.spawn() IPC because otherwise we would have to copy the data once to get it to zig, then write it.
+/// Returns `true` on success, `false` on failure + throws a JS error.
+extern "C" bool Bun__serializeJSValueForSubprocess(JSGlobalObject* globalObject, EncodedJSValue encodedValue, int fd)
+{
+    JSValue value = JSValue::decode(encodedValue);
+
+    Vector<JSC::Strong<JSC::JSObject>> transferList;
+    Vector<RefPtr<MessagePort>> dummyPorts;
+    ExceptionOr<Ref<SerializedScriptValue>> serialized = SerializedScriptValue::create(*globalObject, value, WTFMove(transferList),
+        dummyPorts);
+
+    auto& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    if (serialized.hasException()) {
+        WebCore::propagateException(*globalObject, scope,
+            serialized.releaseException());
+        RELEASE_AND_RETURN(scope, false);
+    }
+
+    auto serializedValue = serialized.releaseReturnValue();
+    auto bytes = serializedValue.ptr()->wireBytes();
+
+    uint8_t id = 2; // IPCMessageType.SerializedMessage
+    write(fd, &id, sizeof(uint8_t));
+    uint32_t size = bytes.size();
+    write(fd, &size, sizeof(uint32_t));
+    write(fd, bytes.data(), size);
+
+    RELEASE_AND_RETURN(scope, true);
+}
+
+extern "C" EncodedJSValue Bun__JSValue__deserialize(JSGlobalObject* globalObject, const uint8_t* bytes, size_t size)
+{
+    Vector<uint8_t> vector(bytes, size);
+    /// ?! did i just give ownership of these bytes to JSC?
+    auto scriptValue = SerializedScriptValue::createFromWireBytes(WTFMove(vector));
+    return JSValue::encode(scriptValue->deserialize(*globalObject, globalObject));
+}
+\ No newline at end of file