From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Wed, 17 Apr 2024 08:17:49 -0400
Subject: build: enable perfetto

Enable perfetto by default in Node.js. Node.js disables perfetto by
default but is broken on build - they don't currently add guards for
`V8_USE_PERFETTO` and upstream only defines certain functions
on `v8::TracingController` if perfetto is disabled. Electron already
had minimal to no support for Node.js trace events, so the impact of
adding associated guards there should be relatively small.

We should upstream this as it will eventually impact Node.js as well.

diff --git a/lib/internal/constants.js b/lib/internal/constants.js
index 8d7204f6cb48f783adc4d1c1eb2de0c83b7fffe2..a154559a56bf383d3c26af523c9bb07b564ef600 100644
--- a/lib/internal/constants.js
+++ b/lib/internal/constants.js
@@ -5,12 +5,15 @@ const isWindows = process.platform === 'win32';
 module.exports = {
   // Alphabet chars.
   CHAR_UPPERCASE_A: 65, /* A */
+  CHAR_UPPERCASE_B: 66, /* B */
   CHAR_LOWERCASE_A: 97, /* a */
   CHAR_UPPERCASE_Z: 90, /* Z */
   CHAR_LOWERCASE_Z: 122, /* z */
   CHAR_UPPERCASE_C: 67, /* C */
   CHAR_LOWERCASE_B: 98, /* b */
+  CHAR_UPPERCASE_E: 69, /* E */
   CHAR_LOWERCASE_E: 101, /* e */
+
   CHAR_LOWERCASE_N: 110, /* n */
 
   // Non-alphabetic chars.
diff --git a/lib/internal/http.js b/lib/internal/http.js
index 251f51ec454f9cba4023b8b6729241ee753aac13..1de8cac6e3953ce9cab9db03530da327199acfd5 100644
--- a/lib/internal/http.js
+++ b/lib/internal/http.js
@@ -8,8 +8,8 @@ const {
 const { setUnrefTimeout } = require('internal/timers');
 const { getCategoryEnabledBuffer, trace } = internalBinding('trace_events');
 const {
-  CHAR_LOWERCASE_B,
-  CHAR_LOWERCASE_E,
+  CHAR_UPPERCASE_B,
+  CHAR_UPPERCASE_E,
 } = require('internal/constants');
 
 let utcCache;
@@ -44,11 +44,13 @@ function isTraceHTTPEnabled() {
 const traceEventCategory = 'node,node.http';
 
 function traceBegin(...args) {
-  trace(CHAR_LOWERCASE_B, traceEventCategory, ...args);
+  // See v8/src/builtins/builtins-trace.cc - must be uppercase for perfetto
+  trace(CHAR_UPPERCASE_B, traceEventCategory, ...args);
 }
 
 function traceEnd(...args) {
-  trace(CHAR_LOWERCASE_E, traceEventCategory, ...args);
+  // See v8/src/builtins/builtins-trace.cc - must be uppercase for perfetto
+  trace(CHAR_UPPERCASE_E, traceEventCategory, ...args);
 }
 
 module.exports = {
diff --git a/node.gyp b/node.gyp
index d97004c8e148be6b63634dad5306756d503fb1f8..271fb4f76bc1e69baad0b1fafca128b3bca4a360 100644
--- a/node.gyp
+++ b/node.gyp
@@ -174,7 +174,6 @@
       'src/timers.cc',
       'src/timer_wrap.cc',
       'src/tracing/agent.cc',
-      'src/tracing/node_trace_buffer.cc',
       'src/tracing/node_trace_writer.cc',
       'src/tracing/trace_event.cc',
       'src/tracing/traced_value.cc',
@@ -302,7 +301,6 @@
       'src/tcp_wrap.h',
       'src/timers.h',
       'src/tracing/agent.h',
-      'src/tracing/node_trace_buffer.h',
       'src/tracing/node_trace_writer.h',
       'src/tracing/trace_event.h',
       'src/tracing/trace_event_common.h',
diff --git a/src/inspector/tracing_agent.cc b/src/inspector/tracing_agent.cc
index 40c8aea35c931c46fc62b717c978eab0659645fd..348cdfb0b42aa18f352c220cea0b896c09f67753 100644
--- a/src/inspector/tracing_agent.cc
+++ b/src/inspector/tracing_agent.cc
@@ -92,14 +92,14 @@ class InspectorTraceWriter : public node::tracing::AsyncTraceWriter {
   explicit InspectorTraceWriter(int frontend_object_id,
                                 std::shared_ptr<MainThreadHandle> main_thread)
       : frontend_object_id_(frontend_object_id), main_thread_(main_thread) {}
-
+#ifndef V8_USE_PERFETTO
   void AppendTraceEvent(
       v8::platform::tracing::TraceObject* trace_event) override {
     if (!json_writer_)
       json_writer_.reset(TraceWriter::CreateJSONTraceWriter(stream_, "value"));
     json_writer_->AppendTraceEvent(trace_event);
   }
-
+#endif
   void Flush(bool) override {
     if (!json_writer_)
       return;
diff --git a/src/tracing/agent.cc b/src/tracing/agent.cc
index 7ce59674356f9743438350949be42fa7ead2afbe..30bff4272ed8eb5146e3b73a4849c187177fc3bd 100644
--- a/src/tracing/agent.cc
+++ b/src/tracing/agent.cc
@@ -2,7 +2,9 @@
 
 #include <string>
 #include "trace_event.h"
+#ifndef V8_USE_PERFETTO
 #include "tracing/node_trace_buffer.h"
+#endif
 #include "debug_utils-inl.h"
 #include "env-inl.h"
 
@@ -50,7 +52,9 @@ using v8::platform::tracing::TraceWriter;
 using std::string;
 
 Agent::Agent() : tracing_controller_(new TracingController()) {
+#ifndef V8_USE_PERFETTO
   tracing_controller_->Initialize(nullptr);
+#endif
 
   CHECK_EQ(uv_loop_init(&tracing_loop_), 0);
   CHECK_EQ(uv_async_init(&tracing_loop_,
@@ -86,10 +90,14 @@ Agent::~Agent() {
 void Agent::Start() {
   if (started_)
     return;
-
+#ifdef V8_USE_PERFETTO
+  std::ostringstream perfetto_output;
+  tracing_controller_->InitializeForPerfetto(&perfetto_output);
+#else
   NodeTraceBuffer* trace_buffer_ = new NodeTraceBuffer(
       NodeTraceBuffer::kBufferChunks, this, &tracing_loop_);
   tracing_controller_->Initialize(trace_buffer_);
+#endif
 
   // This thread should be created *after* async handles are created
   // (within NodeTraceWriter and NodeTraceBuffer constructors).
@@ -143,8 +151,10 @@ void Agent::StopTracing() {
     return;
   // Perform final Flush on TraceBuffer. We don't want the tracing controller
   // to flush the buffer again on destruction of the V8::Platform.
-  tracing_controller_->StopTracing();
+#ifndef V8_USE_PERFETTO
   tracing_controller_->Initialize(nullptr);
+#endif
+  tracing_controller_->StopTracing();
   started_ = false;
 
   // Thread should finish when the tracing loop is stopped.
@@ -202,6 +212,7 @@ std::string Agent::GetEnabledCategories() const {
   return categories;
 }
 
+#ifndef V8_USE_PERFETTO
 void Agent::AppendTraceEvent(TraceObject* trace_event) {
   for (const auto& id_writer : writers_)
     id_writer.second->AppendTraceEvent(trace_event);
@@ -211,18 +222,21 @@ void Agent::AddMetadataEvent(std::unique_ptr<TraceObject> event) {
   Mutex::ScopedLock lock(metadata_events_mutex_);
   metadata_events_.push_back(std::move(event));
 }
+#endif
 
 void Agent::Flush(bool blocking) {
+#ifndef V8_USE_PERFETTO
   {
     Mutex::ScopedLock lock(metadata_events_mutex_);
     for (const auto& event : metadata_events_)
       AppendTraceEvent(event.get());
   }
-
+#endif
   for (const auto& id_writer : writers_)
     id_writer.second->Flush(blocking);
 }
 
+#ifndef V8_USE_PERFETTO
 void TracingController::AddMetadataEvent(
     const unsigned char* category_group_enabled,
     const char* name,
@@ -246,6 +260,6 @@ void TracingController::AddMetadataEvent(
   if (node_agent != nullptr)
     node_agent->AddMetadataEvent(std::move(trace_event));
 }
-
+#endif
 }  // namespace tracing
 }  // namespace node
diff --git a/src/tracing/agent.h b/src/tracing/agent.h
index b542a849fe8da7e8bbbcca7067b73dc32b18d6d3..059ce6f6ea17199ead09c6c13bcc680f18f8c4d0 100644
--- a/src/tracing/agent.h
+++ b/src/tracing/agent.h
@@ -27,7 +27,9 @@ class Agent;
 class AsyncTraceWriter {
  public:
   virtual ~AsyncTraceWriter() = default;
+#ifndef V8_USE_PERFETTO
   virtual void AppendTraceEvent(TraceObject* trace_event) = 0;
+#endif
   virtual void Flush(bool blocking) = 0;
   virtual void InitializeOnThread(uv_loop_t* loop) {}
 };
@@ -36,6 +38,7 @@ class TracingController : public v8::platform::tracing::TracingController {
  public:
   TracingController() : v8::platform::tracing::TracingController() {}
 
+#ifndef V8_USE_PERFETTO
   int64_t CurrentTimestampMicroseconds() override {
     return uv_hrtime() / 1000;
   }
@@ -48,6 +51,7 @@ class TracingController : public v8::platform::tracing::TracingController {
       const uint64_t* arg_values,
       std::unique_ptr<v8::ConvertableToTraceFormat>* convertable_values,
       unsigned int flags);
+#endif
 };
 
 class AgentWriterHandle {
@@ -108,11 +112,12 @@ class Agent {
 
   // Returns a comma-separated list of enabled categories.
   std::string GetEnabledCategories() const;
-
+#ifndef V8_USE_PERFETTO
   // Writes to all writers registered through AddClient().
   void AppendTraceEvent(TraceObject* trace_event);
 
   void AddMetadataEvent(std::unique_ptr<TraceObject> event);
+#endif
   // Flushes all writers registered through AddClient().
   void Flush(bool blocking);
 
@@ -152,7 +157,9 @@ class Agent {
   std::set<AsyncTraceWriter*> to_be_initialized_;
 
   Mutex metadata_events_mutex_;
+#ifndef V8_USE_PERFETTO
   std::list<std::unique_ptr<TraceObject>> metadata_events_;
+#endif
 };
 
 void AgentWriterHandle::reset() {
diff --git a/src/tracing/node_trace_buffer.h b/src/tracing/node_trace_buffer.h
index 18e4f43efaae3a60b924e697918867e604513194..7cbaf01235750138c680c8ec2ed5d206d638f8b6 100644
--- a/src/tracing/node_trace_buffer.h
+++ b/src/tracing/node_trace_buffer.h
@@ -42,7 +42,9 @@ class InternalTraceBuffer {
   bool flushing_;
   size_t max_chunks_;
   Agent* agent_;
+#ifndef V8_USE_PERFETTO
   std::vector<std::unique_ptr<TraceBufferChunk>> chunks_;
+#endif
   size_t total_chunks_ = 0;
   uint32_t current_chunk_seq_ = 1;
   uint32_t id_;
diff --git a/src/tracing/node_trace_writer.cc b/src/tracing/node_trace_writer.cc
index 8f053efe93324b9acbb4e85f7b974b4f7712e200..1801594e727ec7a2ef3b89603975f507078b88a1 100644
--- a/src/tracing/node_trace_writer.cc
+++ b/src/tracing/node_trace_writer.cc
@@ -96,6 +96,7 @@ void NodeTraceWriter::OpenNewFileForStreaming() {
   }
 }
 
+#ifndef V8_USE_PERFETTO
 void NodeTraceWriter::AppendTraceEvent(TraceObject* trace_event) {
   Mutex::ScopedLock scoped_lock(stream_mutex_);
   // If this is the first trace event, open a new file for streaming.
@@ -112,6 +113,7 @@ void NodeTraceWriter::AppendTraceEvent(TraceObject* trace_event) {
   ++total_traces_;
   json_trace_writer_->AppendTraceEvent(trace_event);
 }
+#endif
 
 void NodeTraceWriter::FlushPrivate() {
   std::string str;
diff --git a/src/tracing/node_trace_writer.h b/src/tracing/node_trace_writer.h
index cd965d77b7859ff2edcf781a934594b5a9b6d251..fe1714ba77fddef693d37eeb8c7a196ddfd15c26 100644
--- a/src/tracing/node_trace_writer.h
+++ b/src/tracing/node_trace_writer.h
@@ -20,7 +20,9 @@ class NodeTraceWriter : public AsyncTraceWriter {
   ~NodeTraceWriter() override;
 
   void InitializeOnThread(uv_loop_t* loop) override;
+#ifndef V8_USE_PERFETTO
   void AppendTraceEvent(TraceObject* trace_event) override;
+#endif
   void Flush(bool blocking) override;
 
   static const int kTracesPerFile = 1 << 19;
diff --git a/src/tracing/trace_event.h b/src/tracing/trace_event.h
index a662a081dc3bf356bf93e4063fcb043e4d8df07b..c89cdfe2b2681fbf9946200a03d7d1f7bad21226 100644
--- a/src/tracing/trace_event.h
+++ b/src/tracing/trace_event.h
@@ -69,8 +69,16 @@ enum CategoryGroupEnabledFlags {
 // for best performance when tracing is disabled.
 // const uint8_t*
 //     TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(const char* category_group)
+#ifndef V8_USE_PERFETTO
 #define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED              \
   node::tracing::TraceEventHelper::GetCategoryGroupEnabled
+#else
+#define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group) \
+  ([](const char*) -> const uint8_t* { \
+    static uint8_t no = 0; \
+    return &no; \
+  })(category_group)
+#endif
 
 // Get the number of times traces have been recorded. This is used to implement
 // the TRACE_EVENT_IS_NEW_TRACE facility.
@@ -114,10 +122,15 @@ enum CategoryGroupEnabledFlags {
 //     const uint8_t* category_group_enabled,
 //     const char* name,
 //     uint64_t id)
+#ifndef V8_USE_PERFETTO
 #define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION                           \
   if (auto controller =                                                       \
          node::tracing::TraceEventHelper::GetTracingController())             \
       controller->UpdateTraceEventDuration
+#else
+#define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled, name, event_handle) \
+  (void)(category_group_enabled), (void)(name), (void)(event_handle)
+#endif
 
 // Adds a metadata event to the trace log. The |AppendValueAsTraceFormat| method
 // on the convertable value will be called at flush time.
@@ -319,12 +332,15 @@ class TraceEventHelper {
   static void SetAgent(Agent* agent);
 
   static inline const uint8_t* GetCategoryGroupEnabled(const char* group) {
+#ifndef V8_USE_PERFETTO
     v8::TracingController* controller = GetTracingController();
     static const uint8_t disabled = 0;
     if (controller == nullptr) [[unlikely]] {
       return &disabled;
     }
     return controller->GetCategoryGroupEnabled(group);
+#endif
+    return 0;
   }
 };
 
@@ -462,6 +478,7 @@ static inline uint64_t AddTraceEventImpl(
     const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
     const char** arg_names, const uint8_t* arg_types,
     const uint64_t* arg_values, unsigned int flags) {
+#ifndef V8_USE_PERFETTO
   std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertibles[2];
   if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
     arg_convertibles[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
@@ -478,6 +495,8 @@ static inline uint64_t AddTraceEventImpl(
   return controller->AddTraceEvent(phase, category_group_enabled, name, scope, id,
                                    bind_id, num_args, arg_names, arg_types,
                                    arg_values, arg_convertibles, flags);
+#endif
+  return 0;
 }
 
 static V8_INLINE uint64_t AddTraceEventWithTimestampImpl(
@@ -485,6 +504,7 @@ static V8_INLINE uint64_t AddTraceEventWithTimestampImpl(
     const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
     const char** arg_names, const uint8_t* arg_types,
     const uint64_t* arg_values, unsigned int flags, int64_t timestamp) {
+#ifndef V8_USE_PERFETTO
   std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertibles[2];
   if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
     arg_convertibles[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
@@ -501,12 +521,15 @@ static V8_INLINE uint64_t AddTraceEventWithTimestampImpl(
   return controller->AddTraceEventWithTimestamp(
       phase, category_group_enabled, name, scope, id, bind_id, num_args,
       arg_names, arg_types, arg_values, arg_convertibles, flags, timestamp);
+#endif
+  return 0;
 }
 
 static V8_INLINE void AddMetadataEventImpl(
     const uint8_t* category_group_enabled, const char* name, int32_t num_args,
     const char** arg_names, const uint8_t* arg_types,
     const uint64_t* arg_values, unsigned int flags) {
+#ifndef V8_USE_PERFETTO
   std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertibles[2];
   if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
     arg_convertibles[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
@@ -522,6 +545,7 @@ static V8_INLINE void AddMetadataEventImpl(
   return agent->GetTracingController()->AddMetadataEvent(
       category_group_enabled, name, num_args, arg_names, arg_types, arg_values,
       arg_convertibles, flags);
+#endif
 }
 
 // Define SetTraceValue for each allowed type. It stores the type and
