Machine-readable TurboFan compiler statistics

We'd like to track performance metrics in an automated way. This CL introduces
--turbo-stats-nvp which exposes --turbo-stats information in {"name"=value} pair
format.

BUG=

Review-Url: https://codereview.chromium.org/2053383002
Cr-Commit-Position: refs/heads/master@{#36919}

src/compilation-statistics.cc

@@ -54,8 +54,7 @@ void CompilationStatistics::BasicStats::Accumulate(const BasicStats& stats) {
   }
 }
 
-
-static void WriteLine(std::ostream& os, const char* name,
+static void WriteLine(std::ostream& os, bool machine_format, const char* name,
                       const CompilationStatistics::BasicStats& stats,
                       const CompilationStatistics::BasicStats& total_stats) {
   const size_t kBufferSize = 128;
@@ -66,6 +65,12 @@ static void WriteLine(std::ostream& os, const char* name,
   double size_percent =
       static_cast<double>(stats.total_allocated_bytes_ * 100) /
       static_cast<double>(total_stats.total_allocated_bytes_);
+  if (machine_format) {
+    base::OS::SNPrintF(buffer, kBufferSize,
+                       "\"%s_time\"=%.3f\n\"%s_space\"=%" PRIuS, name, ms, name,
+                       stats.total_allocated_bytes_);
+    os << buffer;
+  } else {
     base::OS::SNPrintF(buffer, kBufferSize, "%28s %10.3f (%5.1f%%)  %10" PRIuS
                                             " (%5.1f%%) %10" PRIuS " %10" PRIuS,
                        name, ms, percent, stats.total_allocated_bytes_,
@@ -77,6 +82,7 @@ static void WriteLine(std::ostream& os, const char* name,
       os << "   " << stats.function_name_.c_str();
     }
     os << std::endl;
+  }
 }
 
 
@@ -101,10 +107,10 @@ static void WritePhaseKindBreak(std::ostream& os) {
         "--------------------------------------------------------\n";
 }
 
-
-std::ostream& operator<<(std::ostream& os, const CompilationStatistics& s) {
+std::ostream& operator<<(std::ostream& os, const AsPrintableStatistics& ps) {
   // phase_kind_map_ and phase_map_ don't get mutated, so store a bunch of
   // pointers into them.
+  const CompilationStatistics& s = ps.s;
 
   typedef std::vector<CompilationStatistics::PhaseKindMap::const_iterator>
       SortedPhaseKinds;
@@ -121,22 +127,27 @@ std::ostream& operator<<(std::ostream& os, const CompilationStatistics& s) {
     sorted_phases[it->second.insert_order_] = it;
   }
 
-  WriteHeader(os);
+  if (!ps.machine_output) WriteHeader(os);
   for (auto phase_kind_it : sorted_phase_kinds) {
     const auto& phase_kind_name = phase_kind_it->first;
+    if (!ps.machine_output) {
       for (auto phase_it : sorted_phases) {
         const auto& phase_stats = phase_it->second;
         if (phase_stats.phase_kind_name_ != phase_kind_name) continue;
         const auto& phase_name = phase_it->first;
-      WriteLine(os, phase_name.c_str(), phase_stats, s.total_stats_);
+        WriteLine(os, ps.machine_output, phase_name.c_str(), phase_stats,
+                  s.total_stats_);
       }
       WritePhaseKindBreak(os);
+    }
     const auto& phase_kind_stats = phase_kind_it->second;
-    WriteLine(os, phase_kind_name.c_str(), phase_kind_stats, s.total_stats_);
+    WriteLine(os, ps.machine_output, phase_kind_name.c_str(), phase_kind_stats,
+              s.total_stats_);
     os << std::endl;
   }
-  WriteFullLine(os);
-  WriteLine(os, "totals", s.total_stats_, s.total_stats_);
+
+  if (!ps.machine_output) WriteFullLine(os);
+  WriteLine(os, ps.machine_output, "totals", s.total_stats_, s.total_stats_);
 
   return os;
 }

src/compilation-statistics.h

@@ -15,6 +15,12 @@ namespace v8 {
 namespace internal {
 
 class CompilationInfo;
+class CompilationStatistics;
+
+struct AsPrintableStatistics {
+  const CompilationStatistics& s;
+  const bool machine_output;
+};
 
 class CompilationStatistics final : public Malloced {
  public:
@@ -65,7 +71,7 @@ class CompilationStatistics final : public Malloced {
   };
 
   friend std::ostream& operator<<(std::ostream& os,
-                                  const CompilationStatistics& s);
+                                  const AsPrintableStatistics& s);
 
   typedef OrderedStats PhaseKindStats;
   typedef std::map<std::string, PhaseKindStats> PhaseKindMap;
@@ -78,7 +84,7 @@ class CompilationStatistics final : public Malloced {
   DISALLOW_COPY_AND_ASSIGN(CompilationStatistics);
 };
 
-std::ostream& operator<<(std::ostream& os, const CompilationStatistics& s);
+std::ostream& operator<<(std::ostream& os, const AsPrintableStatistics& s);
 
 }  // namespace internal
 }  // namespace v8

src/compiler/pipeline.cc

@@ -521,7 +521,7 @@ PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
                                              ZonePool* zone_pool) {
   PipelineStatistics* pipeline_statistics = nullptr;
 
-  if (FLAG_turbo_stats) {
+  if (FLAG_turbo_stats || FLAG_turbo_stats_nvp) {
     pipeline_statistics = new PipelineStatistics(info, zone_pool);
     pipeline_statistics->BeginPhaseKind("initializing");
   }
@@ -1503,7 +1503,7 @@ Handle<Code> Pipeline::GenerateCodeForCodeStub(Isolate* isolate,
   ZonePool zone_pool(isolate->allocator());
   PipelineData data(&zone_pool, &info, graph, schedule);
   base::SmartPointer<PipelineStatistics> pipeline_statistics;
-  if (FLAG_turbo_stats) {
+  if (FLAG_turbo_stats || FLAG_turbo_stats_nvp) {
     pipeline_statistics.Reset(new PipelineStatistics(&info, &zone_pool));
     pipeline_statistics->BeginPhaseKind("stub codegen");
   }
@@ -1557,7 +1557,7 @@ Handle<Code> Pipeline::GenerateCodeForTesting(CompilationInfo* info,
   ZonePool zone_pool(info->isolate()->allocator());
   PipelineData data(&zone_pool, info, graph, schedule);
   base::SmartPointer<PipelineStatistics> pipeline_statistics;
-  if (FLAG_turbo_stats) {
+  if (FLAG_turbo_stats || FLAG_turbo_stats_nvp) {
     pipeline_statistics.Reset(new PipelineStatistics(info, &zone_pool));
     pipeline_statistics->BeginPhaseKind("test codegen");
   }

src/flag-definitions.h

@@ -449,6 +449,8 @@ DEFINE_BOOL(turbo_asm_deoptimization, false,
             "enable deoptimization in TurboFan for asm.js code")
 DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase")
 DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics")
+DEFINE_BOOL(turbo_stats_nvp, false,
+            "print TurboFan statistics in machine-readable format")
 DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan")
 DEFINE_BOOL(turbo_type_feedback, false,
             "use typed feedback for representation inference in Turbofan")

src/isolate.cc

@@ -2450,8 +2450,17 @@ void Isolate::UnlinkDeferredHandles(DeferredHandles* deferred) {
 
 void Isolate::DumpAndResetCompilationStats() {
   if (turbo_statistics() != nullptr) {
+    DCHECK(FLAG_turbo_stats || FLAG_turbo_stats_nvp);
+
     OFStream os(stdout);
-    os << *turbo_statistics() << std::endl;
+    if (FLAG_turbo_stats) {
+      AsPrintableStatistics ps = {*turbo_statistics(), false};
+      os << ps << std::endl;
+    }
+    if (FLAG_turbo_stats_nvp) {
+      AsPrintableStatistics ps = {*turbo_statistics(), true};
+      os << ps << std::endl;
+    }
   }
   if (hstatistics() != nullptr) hstatistics()->Print();
   delete turbo_statistics_;