From acebebfd212ff6e34ddfdc2ebbd657f5cc941aba Mon Sep 17 00:00:00 2001
From: Ruslan Lesiutin <hoxy@meta.com>
Date: Mon, 17 Feb 2025 09:34:33 -0800
Subject: [PATCH] Expose API for registering processes and threads (#49083)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49083

# Changelog: [Internal]

> NOTE: Some CI jobs are expected to fail, because changes in Hermes D67353585 should be landed first, and then grafted to Static Hermes.

Added 2 new public methods to `PerformanceTracer` instance for registering metadata Trace Events for processes and threads.

Reviewed By: huntie

Differential Revision: D68439733

fbshipit-source-id: dd9f0e72e2414b8c665c57a542cbbfe7df34a516
---
 .../tracing/PerformanceTracer.cpp             | 34 +++++++++++++++++++
 .../tracing/PerformanceTracer.h               | 11 ++++++
 2 files changed, 45 insertions(+)

diff --git a/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.cpp b/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.cpp
index 22d65d8a726..2a4fd3c7e74 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.cpp
+++ b/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.cpp
@@ -151,6 +151,40 @@ void PerformanceTracer::reportMeasure(
   });
 }
 
+void PerformanceTracer::reportProcess(uint64_t id, const std::string& name) {
+  std::lock_guard<std::mutex> lock(mutex_);
+  if (!tracing_) {
+    return;
+  }
+
+  buffer_.push_back(TraceEvent{
+      .name = "process_name",
+      .cat = "__metadata",
+      .ph = 'M',
+      .ts = 0,
+      .pid = id,
+      .tid = 0,
+      .args = folly::dynamic::object("name", name),
+  });
+}
+
+void PerformanceTracer::reportThread(uint64_t id, const std::string& name) {
+  std::lock_guard<std::mutex> lock(mutex_);
+  if (!tracing_) {
+    return;
+  }
+
+  buffer_.push_back(TraceEvent{
+      .name = "thread_name",
+      .cat = "__metadata",
+      .ph = 'M',
+      .ts = 0,
+      .pid = processId_,
+      .tid = id,
+      .args = folly::dynamic::object("name", name),
+  });
+}
+
 folly::dynamic PerformanceTracer::serializeTraceEvent(TraceEvent event) const {
   folly::dynamic result = folly::dynamic::object;
 
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.h b/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.h
index f8fedaeb304..cf80b68080c 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.h
+++ b/packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.h
@@ -13,6 +13,7 @@
 #include <folly/dynamic.h>
 
 #include <functional>
+#include <mutex>
 #include <optional>
 #include <vector>
 
@@ -66,6 +67,16 @@ class PerformanceTracer {
       uint64_t duration,
       const std::optional<DevToolsTrackEntryPayload>& trackMetadata);
 
+  /**
+   * Record a corresponding Trace Event for OS-level process.
+   */
+  void reportProcess(uint64_t id, const std::string& name);
+
+  /**
+   * Record a corresponding Trace Event for OS-level thread.
+   */
+  void reportThread(uint64_t id, const std::string& name);
+
  private:
   PerformanceTracer();
   PerformanceTracer(const PerformanceTracer&) = delete;