src: improve StreamBase read throughput

Improve performance by providing JS with the raw ingridients
for the read data, i.e. an `ArrayBuffer` + offset + length
fields, instead of creating `Buffer` instances in C++ land.

PR-URL: https://github.com/nodejs/node/pull/23797
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/env.h b/src/env.h
index 3daa48f9cb..a85058f895 100644
--- a/src/env.h
+++ b/src/env.h
@@ -668,6 +668,7 @@ class Environment {
   should_abort_on_uncaught_toggle();
 
   inline AliasedBuffer<uint8_t, v8::Uint8Array>& trace_category_state();
+  inline AliasedBuffer<int32_t, v8::Int32Array>& stream_base_state();
 
   // The necessary API for async_hooks.
   inline double new_async_id();
@@ -951,6 +952,8 @@ class Environment {
   AliasedBuffer<uint8_t, v8::Uint8Array> trace_category_state_;
   std::unique_ptr<TrackingTraceStateObserver> trace_state_observer_;
 
+  AliasedBuffer<int32_t, v8::Int32Array> stream_base_state_;
+
   std::unique_ptr<performance::performance_state> performance_state_;
   std::unordered_map<std::string, uint64_t> performance_marks_;