[cpu-profiler] Split out debug mode for CPU profiler naming

Adds a new flag to CpuProfiler to control whether or not "debug" names
(potentially inferred from scope) are used for captured frames
associated with a SharedFunctionInfo instance.

Bug: v8:9135
Change-Id: I104f3246431dc6336de4e4688c0d98c86e0bb776
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1566169
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60972}

include/v8-profiler.h

@@ -297,6 +297,15 @@ enum CpuProfilingMode {
   kCallerLineNumbers,
 };
 
+// Determines how names are derived for functions sampled.
+enum CpuProfilingNamingMode {
+  // Use the immediate name of functions at compilation time.
+  kStandardNaming,
+  // Use more verbose naming for functions without names, inferred from scope
+  // where possible.
+  kDebugNaming,
+};
+
 /**
  * Interface for controlling CPU profiling. Instance of the
  * profiler can be created using v8::CpuProfiler::New method.
@@ -308,7 +317,8 @@ class V8_EXPORT CpuProfiler {
    * initialized. The profiler object must be disposed after use by calling
    * |Dispose| method.
    */
-  static CpuProfiler* New(Isolate* isolate);
+  static CpuProfiler* New(Isolate* isolate,
+                          CpuProfilingNamingMode = kDebugNaming);
 
   /**
    * Synchronously collect current stack sample in all profilers attached to

src/api.cc

@@ -10117,9 +10117,9 @@ int CpuProfile::GetSamplesCount() const {
   return reinterpret_cast<const i::CpuProfile*>(this)->samples_count();
 }
 
-CpuProfiler* CpuProfiler::New(Isolate* isolate) {
+CpuProfiler* CpuProfiler::New(Isolate* isolate, CpuProfilingNamingMode mode) {
   return reinterpret_cast<CpuProfiler*>(
-      new i::CpuProfiler(reinterpret_cast<i::Isolate*>(isolate)));
+      new i::CpuProfiler(reinterpret_cast<i::Isolate*>(isolate), mode));
 }
 
 void CpuProfiler::Dispose() { delete reinterpret_cast<i::CpuProfiler*>(this); }

src/profiler/cpu-profiler.cc

@@ -310,14 +310,16 @@ DEFINE_LAZY_LEAKY_OBJECT_GETTER(CpuProfilersManager, GetProfilersManager)
 
 }  // namespace
 
-CpuProfiler::CpuProfiler(Isolate* isolate)
+CpuProfiler::CpuProfiler(Isolate* isolate, CpuProfilingNamingMode naming_mode)
-    : CpuProfiler(isolate, new CpuProfilesCollection(isolate), nullptr,
+    : CpuProfiler(isolate, naming_mode, new CpuProfilesCollection(isolate),
-                  nullptr) {}
+                  nullptr, nullptr) {}
 
-CpuProfiler::CpuProfiler(Isolate* isolate, CpuProfilesCollection* test_profiles,
+CpuProfiler::CpuProfiler(Isolate* isolate, CpuProfilingNamingMode naming_mode,
+                         CpuProfilesCollection* test_profiles,
                          ProfileGenerator* test_generator,
                          ProfilerEventsProcessor* test_processor)
     : isolate_(isolate),
+      naming_mode_(naming_mode),
       sampling_interval_(base::TimeDelta::FromMicroseconds(
           FLAG_cpu_profiler_sampling_interval)),
       profiles_(test_profiles),
@@ -409,7 +411,8 @@ void CpuProfiler::StartProcessorIfNotStarted() {
   if (profiler_listener_) {
     profiler_listener_->set_observer(processor_.get());
   } else {
-    profiler_listener_.reset(new ProfilerListener(isolate_, processor_.get()));
+    profiler_listener_.reset(
+        new ProfilerListener(isolate_, processor_.get(), naming_mode_));
   }
   logger->AddCodeEventListener(profiler_listener_.get());
   is_profiling_ = true;

src/profiler/cpu-profiler.h

@@ -216,10 +216,10 @@ class V8_EXPORT_PRIVATE SamplingEventsProcessor
 
 class V8_EXPORT_PRIVATE CpuProfiler {
  public:
-  explicit CpuProfiler(Isolate* isolate);
+  explicit CpuProfiler(Isolate* isolate, CpuProfilingNamingMode = kDebugNaming);
 
-  CpuProfiler(Isolate* isolate, CpuProfilesCollection* profiles,
+  CpuProfiler(Isolate* isolate, CpuProfilingNamingMode naming_mode,
-              ProfileGenerator* test_generator,
+              CpuProfilesCollection* profiles, ProfileGenerator* test_generator,
               ProfilerEventsProcessor* test_processor);
 
   ~CpuProfiler();
@@ -227,6 +227,7 @@ class V8_EXPORT_PRIVATE CpuProfiler {
   static void CollectSample(Isolate* isolate);
 
   typedef v8::CpuProfilingMode ProfilingMode;
+  typedef v8::CpuProfilingNamingMode NamingMode;
 
   void set_sampling_interval(base::TimeDelta value);
   void set_use_precise_sampling(bool);
@@ -260,6 +261,7 @@ class V8_EXPORT_PRIVATE CpuProfiler {
   void CreateEntriesForRuntimeCallStats();
 
   Isolate* const isolate_;
+  const NamingMode naming_mode_;
   base::TimeDelta sampling_interval_;
   bool use_precise_sampling_ = true;
   std::unique_ptr<CpuProfilesCollection> profiles_;

src/profiler/profiler-listener.cc

@@ -21,8 +21,9 @@ namespace v8 {
 namespace internal {
 
 ProfilerListener::ProfilerListener(Isolate* isolate,
-                                   CodeEventObserver* observer)
+                                   CodeEventObserver* observer,
-    : isolate_(isolate), observer_(observer) {}
+                                   CpuProfilingNamingMode naming_mode)
+    : isolate_(isolate), observer_(observer), naming_mode_(naming_mode) {}
 
 ProfilerListener::~ProfilerListener() = default;
 
@@ -163,7 +164,7 @@ void ProfilerListener::CodeCreateEvent(CodeEventListener::LogEventsAndTags tag,
 
           std::unique_ptr<CodeEntry> inline_entry =
               base::make_unique<CodeEntry>(
-                  tag, GetName(pos_info.shared->DebugName()), resource_name,
+                  tag, GetFunctionName(*pos_info.shared), resource_name,
                   start_pos_info.line + 1, start_pos_info.column + 1, nullptr,
                   code->InstructionStart(), inline_is_shared_cross_origin);
           inline_entry->FillFunctionInfo(*pos_info.shared);
@@ -182,7 +183,7 @@ void ProfilerListener::CodeCreateEvent(CodeEventListener::LogEventsAndTags tag,
     }
   }
   rec->entry =
-      new CodeEntry(tag, GetName(shared->DebugName()),
+      new CodeEntry(tag, GetFunctionName(shared),
                     GetName(InferScriptName(script_name, shared)), line, column,
                     std::move(line_table), abstract_code->InstructionStart(),
                     is_shared_cross_origin);
@@ -283,6 +284,18 @@ Name ProfilerListener::InferScriptName(Name name, SharedFunctionInfo info) {
   return source_url->IsName() ? Name::cast(source_url) : name;
 }
 
+const char* ProfilerListener::GetFunctionName(SharedFunctionInfo shared) {
+  DisallowHeapAllocation no_gc;
+  switch (naming_mode_) {
+    case kDebugNaming:
+      return GetName(shared.DebugName());
+    case kStandardNaming:
+      return GetName(shared.Name());
+    default:
+      UNREACHABLE();
+  }
+}
+
 void ProfilerListener::AttachDeoptInlinedFrames(Code code,
                                                 CodeDeoptEventRecord* rec) {
   int deopt_id = rec->deopt_id;

src/profiler/profiler-listener.h

@@ -8,6 +8,7 @@
 #include <memory>
 #include <vector>
 
+#include "include/v8-profiler.h"
 #include "src/code-events.h"
 #include "src/profiler/profile-generator.h"
 
@@ -25,7 +26,8 @@ class CodeEventObserver {
 
 class V8_EXPORT_PRIVATE ProfilerListener : public CodeEventListener {
  public:
-  ProfilerListener(Isolate*, CodeEventObserver*);
+  ProfilerListener(Isolate*, CodeEventObserver*,
+                   CpuProfilingNamingMode mode = kDebugNaming);
   ~ProfilerListener() override;
 
   void CallbackEvent(Name name, Address entry_point) override;
@@ -70,6 +72,8 @@ class V8_EXPORT_PRIVATE ProfilerListener : public CodeEventListener {
   void set_observer(CodeEventObserver* observer) { observer_ = observer; }
 
  private:
+  const char* GetFunctionName(SharedFunctionInfo);
+
   void AttachDeoptInlinedFrames(Code code, CodeDeoptEventRecord* rec);
   Name InferScriptName(Name name, SharedFunctionInfo info);
   V8_INLINE void DispatchCodeEvent(const CodeEventsContainer& evt_rec) {
@@ -79,6 +83,7 @@ class V8_EXPORT_PRIVATE ProfilerListener : public CodeEventListener {
   Isolate* isolate_;
   CodeEventObserver* observer_;
   StringsStorage function_and_resource_names_;
+  const CpuProfilingNamingMode naming_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfilerListener);
 };

src/profiler/tracing-cpu-profiler.cc

@@ -53,7 +53,7 @@ void TracingCpuProfilerImpl::StartProfiling() {
   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler.hires"), &enabled);
   int sampling_interval_us = enabled ? 100 : 1000;
-  profiler_.reset(new CpuProfiler(isolate_));
+  profiler_.reset(new CpuProfiler(isolate_, kDebugNaming));
   profiler_->set_sampling_interval(
       base::TimeDelta::FromMicroseconds(sampling_interval_us));
   profiler_->StartProfiling("", true);

test/cctest/test-cpu-profiler.cc

@@ -226,7 +226,7 @@ TEST(TickEvents) {
   ProfilerEventsProcessor* processor = new SamplingEventsProcessor(
       CcTest::i_isolate(), generator,
       v8::base::TimeDelta::FromMicroseconds(100), true);
-  CpuProfiler profiler(isolate, profiles, generator, processor);
+  CpuProfiler profiler(isolate, kDebugNaming, profiles, generator, processor);
   profiles->StartProfiling("", false);
   processor->Start();
   ProfilerListener profiler_listener(isolate, processor);
@@ -295,7 +295,7 @@ TEST(Issue1398) {
   ProfilerEventsProcessor* processor = new SamplingEventsProcessor(
       CcTest::i_isolate(), generator,
       v8::base::TimeDelta::FromMicroseconds(100), true);
-  CpuProfiler profiler(isolate, profiles, generator, processor);
+  CpuProfiler profiler(isolate, kDebugNaming, profiles, generator, processor);
   profiles->StartProfiling("", false);
   processor->Start();
   ProfilerListener profiler_listener(isolate, processor);
@@ -1153,7 +1153,7 @@ static void TickLines(bool optimize) {
   ProfilerEventsProcessor* processor = new SamplingEventsProcessor(
       CcTest::i_isolate(), generator,
       v8::base::TimeDelta::FromMicroseconds(100), true);
-  CpuProfiler profiler(isolate, profiles, generator, processor);
+  CpuProfiler profiler(isolate, kDebugNaming, profiles, generator, processor);
   profiles->StartProfiling("", false);
   // TODO(delphick): Stop using the CpuProfiler internals here: This forces
   // LogCompiledFunctions so that source positions are collected everywhere.
@@ -2857,6 +2857,74 @@ TEST(LowPrecisionSamplingStartStopPublic) {
   cpu_profiler->Dispose();
 }
 
+const char* naming_test_source = R"(
+  function doWork(n = 1e3) {
+    let x = 1;
+    for (let i = 0; i < n; i++) {
+      for (let j = 0; j < n; j++) {
+        x += i * j;
+      }
+    }
+    return x;
+  }
+
+  (function testAssignmentPropertyNamedFunction() {
+    let object = {};
+    object.propNamed = function () {
+      doWork();
+    };
+    object.propNamed();
+  })();
+  )";
+
+TEST(StandardNaming) {
+  LocalContext env;
+  i::Isolate* isolate = CcTest::i_isolate();
+  i::HandleScope scope(isolate);
+
+  v8::CpuProfiler* profiler =
+      v8::CpuProfiler::New(env->GetIsolate(), kStandardNaming);
+
+  const auto profile_name = v8_str("");
+  profiler->StartProfiling(profile_name);
+  CompileRun(naming_test_source);
+  auto* profile = profiler->StopProfiling(profile_name);
+
+  auto* root = profile->GetTopDownRoot();
+  auto* toplevel = FindChild(root, "");
+  DCHECK(toplevel);
+
+  auto* prop_assignment_named_test =
+      GetChild(env.local(), toplevel, "testAssignmentPropertyNamedFunction");
+  CHECK(FindChild(prop_assignment_named_test, ""));
+
+  profiler->Dispose();
+}
+
+TEST(DebugNaming) {
+  LocalContext env;
+  i::Isolate* isolate = CcTest::i_isolate();
+  i::HandleScope scope(isolate);
+
+  v8::CpuProfiler* profiler =
+      v8::CpuProfiler::New(env->GetIsolate(), kDebugNaming);
+
+  const auto profile_name = v8_str("");
+  profiler->StartProfiling(profile_name);
+  CompileRun(naming_test_source);
+  auto* profile = profiler->StopProfiling(profile_name);
+
+  auto* root = profile->GetTopDownRoot();
+  auto* toplevel = FindChild(root, "");
+  DCHECK(toplevel);
+
+  auto* prop_assignment_named_test =
+      GetChild(env.local(), toplevel, "testAssignmentPropertyNamedFunction");
+  CHECK(FindChild(prop_assignment_named_test, "object.propNamed"));
+
+  profiler->Dispose();
+}
+
 enum class EntryCountMode { kAll, kOnlyInlined };
 
 // Count the number of unique source positions.