inspector: implement --cpu-prof[-path]

This patch introduces a CLI flag --cpu-prof that starts the V8
CPU profiler on start up, and ends the profiler then writes the
CPU profile before the Node.js instance (on the main thread or
the worker thread) exits. By default the profile is written to
`${cwd}/CPU.${yyyymmdd}.${hhmmss}.${pid}.${tid}.${seq}.cpuprofile`.
The patch also introduces a --cpu-prof-path flag for the user
to specify the path the profile will be written to.

Refs: https://github.com/nodejs/node/issues/26878
PR-URL: https://github.com/nodejs/node/pull/27147
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/env-inl.h b/src/env-inl.h
index e8943ffaf5..3a6caa19f8 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -659,6 +659,25 @@ inline profiler::V8CoverageConnection* Environment::coverage_connection() {
 inline const std::string& Environment::coverage_directory() const {
   return coverage_directory_;
 }
+
+inline void Environment::set_cpu_profiler_connection(
+    std::unique_ptr<profiler::V8CpuProfilerConnection> connection) {
+  CHECK_NULL(cpu_profiler_connection_);
+  std::swap(cpu_profiler_connection_, connection);
+}
+
+inline profiler::V8CpuProfilerConnection*
+Environment::cpu_profiler_connection() {
+  return cpu_profiler_connection_.get();
+}
+
+inline void Environment::set_cpu_profile_path(const std::string& path) {
+  cpu_profile_path_ = path;
+}
+
+inline const std::string& Environment::cpu_profile_path() const {
+  return cpu_profile_path_;
+}
 #endif  // HAVE_INSPECTOR
 
 inline std::shared_ptr<HostPort> Environment::inspector_host_port() {