Expose API for registering profiles and profile chunks (#49084)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49084

# 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 public methods to `PerformanceTracer` instance for registering `Profile` and `ProfileChunk` Trace Events.

Also created data structs in `TraceEvent.h` to simplify serialization process for objects like call frames / samples / etc.

Reviewed By: huntie

Differential Revision: D68558805

fbshipit-source-id: f5eca0435c56828909f99ec0b47841d24ee907b6

packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.cpp

@@ -68,6 +68,7 @@ bool PerformanceTracer::stopTracing() {
   }
 
   performanceMeasureCount_ = 0;
+  profileCount_ = 0;
   tracing_ = false;
   return true;
 }
@@ -213,6 +214,56 @@ void PerformanceTracer::reportThread(uint64_t id, const std::string& name) {
   });
 }
 
+uint16_t PerformanceTracer::reportRuntimeProfile(
+    uint64_t threadId,
+    uint64_t eventUnixTimestamp) {
+  std::lock_guard lock(mutex_);
+  if (!tracing_) {
+    throw std::runtime_error(
+        "Runtime Profile should only be reported when Tracing is enabled");
+  }
+
+  ++profileCount_;
+  // CDT prioritizes event timestamp over startTime metadata field.
+  // https://fburl.com/lo764pf4
+  buffer_.push_back(TraceEvent{
+      .id = profileCount_,
+      .name = "Profile",
+      .cat = "disabled-by-default-v8.cpu_profiler",
+      .ph = 'P',
+      .ts = eventUnixTimestamp,
+      .pid = processId_,
+      .tid = threadId,
+      .args = folly::dynamic::object(
+          "data", folly ::dynamic::object("startTime", eventUnixTimestamp)),
+  });
+
+  return profileCount_;
+}
+
+void PerformanceTracer::reportRuntimeProfileChunk(
+    uint16_t profileId,
+    uint64_t threadId,
+    uint64_t eventUnixTimestamp,
+    const tracing::TraceEventProfileChunk& traceEventProfileChunk) {
+  std::lock_guard lock(mutex_);
+  if (!tracing_) {
+    return;
+  }
+
+  buffer_.push_back(TraceEvent{
+      .id = profileId,
+      .name = "ProfileChunk",
+      .cat = "disabled-by-default-v8.cpu_profiler",
+      .ph = 'P',
+      .ts = eventUnixTimestamp,
+      .pid = processId_,
+      .tid = threadId,
+      .args =
+          folly::dynamic::object("data", traceEventProfileChunk.asDynamic()),
+  });
+}
+
 void PerformanceTracer::reportEventLoopTask(uint64_t start, uint64_t end) {
   if (!tracing_) {
     return;

packages/react-native/ReactCommon/jsinspector-modern/tracing/PerformanceTracer.h

@@ -9,6 +9,7 @@
 
 #include "CdpTracing.h"
 #include "TraceEvent.h"
+#include "TraceEventProfile.h"
 
 #include <folly/dynamic.h>
 
@@ -94,6 +95,21 @@ class PerformanceTracer {
    */
   void reportJavaScriptThread();
 
+  /**
+   * Record a corresponding Profile Trace Event.
+   * \return the id of the profile, should be used to linking profile chunks.
+   */
+  uint16_t reportRuntimeProfile(uint64_t threadId, uint64_t eventUnixTimestamp);
+
+  /**
+   * Record a corresponding ProfileChunk Trace Event.
+   */
+  void reportRuntimeProfileChunk(
+      uint16_t profileId,
+      uint64_t threadId,
+      uint64_t eventUnixTimestamp,
+      const tracing::TraceEventProfileChunk& traceEventProfileChunk);
+
   /**
    * Record an Event Loop tick, which will be represented as an Event Loop task
    * on a timeline view and grouped with JavaScript samples.
@@ -111,6 +127,7 @@ class PerformanceTracer {
   bool tracing_{false};
   uint64_t processId_;
   uint32_t performanceMeasureCount_{0};
+  uint16_t profileCount_{0};
   std::vector<TraceEvent> buffer_;
   std::mutex mutex_;
 };

packages/react-native/ReactCommon/jsinspector-modern/tracing/TraceEventProfile.h

@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <folly/dynamic.h>
+
+#include <utility>
+
+namespace facebook::react::jsinspector_modern::tracing {
+
+/// Arbitrary data structure, which represents payload of the "ProfileChunk"
+/// Trace Event.
+struct TraceEventProfileChunk {
+  /// Deltas between timestamps of chronolocigally sorted samples.
+  /// Will be sent as part of the "ProfileChunk" trace event.
+  struct TimeDeltas {
+   public:
+    explicit TimeDeltas(std::vector<long long> deltas)
+        : deltas_(std::move(deltas)) {}
+
+    folly::dynamic asDynamic() const {
+      folly::dynamic value = folly::dynamic::array();
+      for (auto delta : deltas_) {
+        value.push_back(delta);
+      }
+
+      return value;
+    }
+
+   private:
+    std::vector<long long> deltas_;
+  };
+
+  /// Contains Profile information that will be emitted in this chunk: nodes and
+  /// sample root node ids.
+  struct CPUProfile {
+    /// Unique node in the profile tree, has unique id, call frame and
+    /// optionally
+    /// id of its parent node. Only root node has no parent.
+    struct Node {
+      /// Unique call frame in the call stack.
+      struct CallFrame {
+       public:
+        CallFrame(
+            std::string codeType,
+            uint32_t scriptId,
+            std::string functionName,
+            std::optional<std::string> url = std::nullopt,
+            std::optional<uint32_t> lineNumber = std::nullopt,
+            std::optional<uint32_t> columnNumber = std::nullopt)
+            : codeType_(std::move(codeType)),
+              scriptId_(scriptId),
+              functionName_(std::move(functionName)),
+              url_(std::move(url)),
+              lineNumber_(lineNumber),
+              columnNumber_(columnNumber) {}
+
+        folly::dynamic asDynamic() const {
+          folly::dynamic dynamicCallFrame = folly::dynamic::object();
+          dynamicCallFrame["codeType"] = codeType_;
+          dynamicCallFrame["scriptId"] = scriptId_;
+          dynamicCallFrame["functionName"] = functionName_;
+          if (url_.has_value()) {
+            dynamicCallFrame["url"] = url_.value();
+          }
+          if (lineNumber_.has_value()) {
+            dynamicCallFrame["lineNumber"] = lineNumber_.value();
+          }
+          if (columnNumber_.has_value()) {
+            dynamicCallFrame["columnNumber"] = columnNumber_.value();
+          }
+
+          return dynamicCallFrame;
+        }
+
+       private:
+        std::string codeType_;
+        uint32_t scriptId_;
+        std::string functionName_;
+        std::optional<std::string> url_;
+        std::optional<uint32_t> lineNumber_;
+        std::optional<uint32_t> columnNumber_;
+      };
+
+     public:
+      Node(
+          uint32_t id,
+          CallFrame callFrame,
+          std::optional<uint32_t> parentId = std::nullopt)
+          : id_(id), callFrame_(std::move(callFrame)), parentId_(parentId) {}
+
+      folly::dynamic asDynamic() const {
+        folly::dynamic dynamicNode = folly::dynamic::object();
+
+        dynamicNode["callFrame"] = callFrame_.asDynamic();
+        dynamicNode["id"] = id_;
+        if (parentId_.has_value()) {
+          dynamicNode["parent"] = parentId_.value();
+        }
+
+        return dynamicNode;
+      }
+
+     private:
+      uint32_t id_;
+      CallFrame callFrame_;
+      std::optional<uint32_t> parentId_;
+    };
+
+   public:
+    CPUProfile(std::vector<Node> nodes, std::vector<uint32_t> samples)
+        : nodes_(std::move(nodes)), samples_(std::move(samples)) {}
+
+    folly::dynamic asDynamic() const {
+      folly::dynamic dynamicNodes = folly::dynamic::array();
+      for (const auto& node : nodes_) {
+        dynamicNodes.push_back(node.asDynamic());
+      }
+
+      folly::dynamic dynamicSamples = folly::dynamic::array();
+      for (auto sample : samples_) {
+        dynamicSamples.push_back(sample);
+      }
+
+      return folly::dynamic::object("nodes", dynamicNodes)(
+          "samples", dynamicSamples);
+    }
+
+   private:
+    std::vector<Node> nodes_;
+    std::vector<uint32_t> samples_;
+  };
+
+ public:
+  TraceEventProfileChunk(CPUProfile cpuProfile, TimeDeltas timeDeltas)
+      : cpuProfile_(std::move(cpuProfile)),
+        timeDeltas_(std::move(timeDeltas)) {}
+
+  folly::dynamic asDynamic() const {
+    folly::dynamic value = folly::dynamic::object;
+    value["cpuProfile"] = cpuProfile_.asDynamic();
+    value["timeDeltas"] = timeDeltas_.asDynamic();
+
+    return value;
+  }
+
+ private:
+  CPUProfile cpuProfile_;
+  TimeDeltas timeDeltas_;
+};
+
+} // namespace facebook::react::jsinspector_modern::tracing