[turbofan] Enable concurrent (re)compilation.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index e7c76aabc3934d7212c714197bd75ba34470b87a..b1e9156a4aaa5eb4b39b415f703dc95323c059c8 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -56,19 +56,33 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-class PipelineData {
+namespace {
+
+PipelineStatistics* NewPipelineStatistics(CompilationInfo* const info,
+                                          ZonePool* const zone_pool) {
+  if (FLAG_turbo_stats) {
+    PipelineStatistics* pipeline_statistics =
+        new PipelineStatistics(info, zone_pool);
+    pipeline_statistics->BeginPhaseKind("initializing");
+    return pipeline_statistics;
+  }
+  return nullptr;
+}
+
+}  // namespace
+
+
+class PipelineData final {
  public:
   // For main entry point.
-  PipelineData(ZonePool* zone_pool, CompilationInfo* info,
-               PipelineStatistics* pipeline_statistics)
+  explicit PipelineData(CompilationInfo* info)
       : isolate_(info->isolate()),
         info_(info),
         outer_zone_(info_->zone()),
-        zone_pool_(zone_pool),
-        pipeline_statistics_(pipeline_statistics),
+        pipeline_statistics_(NewPipelineStatistics(info, zone_pool())),
         compilation_failed_(false),
         code_(Handle<Code>::null()),
-        graph_zone_scope_(zone_pool_),
+        graph_zone_scope_(&zone_pool_),
         graph_zone_(graph_zone_scope_.zone()),
         graph_(nullptr),
         loop_assignment_(nullptr),
@@ -77,16 +91,17 @@ class PipelineData {
         javascript_(nullptr),
         jsgraph_(nullptr),
         js_type_feedback_(nullptr),
-        typer_(nullptr),
         schedule_(nullptr),
-        instruction_zone_scope_(zone_pool_),
+        linkage_(nullptr),
+        profiler_data_(nullptr),
+        instruction_zone_scope_(&zone_pool_),
         instruction_zone_(instruction_zone_scope_.zone()),
         sequence_(nullptr),
         frame_(nullptr),
-        register_allocation_zone_scope_(zone_pool_),
+        register_allocation_zone_scope_(&zone_pool_),
         register_allocation_zone_(register_allocation_zone_scope_.zone()),
         register_allocation_data_(nullptr) {
-    PhaseScope scope(pipeline_statistics, "init pipeline data");
+    PhaseScope scope(pipeline_statistics(), "init pipeline data");
     graph_ = new (graph_zone_) Graph(graph_zone_);
     source_positions_.Reset(new SourcePositionTable(graph_));
     machine_ = new (graph_zone_) MachineOperatorBuilder(
@@ -96,20 +111,17 @@ class PipelineData {
     javascript_ = new (graph_zone_) JSOperatorBuilder(graph_zone_);
     jsgraph_ = new (graph_zone_)
         JSGraph(isolate_, graph_, common_, javascript_, machine_);
-    typer_.Reset(new Typer(isolate_, graph_, info_->context()));
   }
 
   // For machine graph testing entry point.
-  PipelineData(ZonePool* zone_pool, CompilationInfo* info, Graph* graph,
-               Schedule* schedule)
+  PipelineData(CompilationInfo* info, Graph* graph, Schedule* schedule)
       : isolate_(info->isolate()),
         info_(info),
         outer_zone_(nullptr),
-        zone_pool_(zone_pool),
         pipeline_statistics_(nullptr),
         compilation_failed_(false),
         code_(Handle<Code>::null()),
-        graph_zone_scope_(zone_pool_),
+        graph_zone_scope_(&zone_pool_),
         graph_zone_(nullptr),
         graph_(graph),
         source_positions_(new SourcePositionTable(graph_)),
@@ -119,27 +131,26 @@ class PipelineData {
         javascript_(nullptr),
         jsgraph_(nullptr),
         js_type_feedback_(nullptr),
-        typer_(nullptr),
         schedule_(schedule),
-        instruction_zone_scope_(zone_pool_),
+        linkage_(nullptr),
+        profiler_data_(nullptr),
+        instruction_zone_scope_(&zone_pool_),
         instruction_zone_(instruction_zone_scope_.zone()),
         sequence_(nullptr),
         frame_(nullptr),
-        register_allocation_zone_scope_(zone_pool_),
+        register_allocation_zone_scope_(&zone_pool_),
         register_allocation_zone_(register_allocation_zone_scope_.zone()),
         register_allocation_data_(nullptr) {}
 
   // For register allocation testing entry point.
-  PipelineData(ZonePool* zone_pool, CompilationInfo* info,
-               InstructionSequence* sequence)
+  PipelineData(CompilationInfo* info, InstructionSequence* sequence)
       : isolate_(info->isolate()),
         info_(info),
         outer_zone_(nullptr),
-        zone_pool_(zone_pool),
         pipeline_statistics_(nullptr),
         compilation_failed_(false),
         code_(Handle<Code>::null()),
-        graph_zone_scope_(zone_pool_),
+        graph_zone_scope_(&zone_pool_),
         graph_zone_(nullptr),
         graph_(nullptr),
         loop_assignment_(nullptr),
@@ -148,13 +159,14 @@ class PipelineData {
         javascript_(nullptr),
         jsgraph_(nullptr),
         js_type_feedback_(nullptr),
-        typer_(nullptr),
         schedule_(nullptr),
-        instruction_zone_scope_(zone_pool_),
+        linkage_(nullptr),
+        profiler_data_(nullptr),
+        instruction_zone_scope_(&zone_pool_),
         instruction_zone_(sequence->zone()),
         sequence_(sequence),
         frame_(nullptr),
-        register_allocation_zone_scope_(zone_pool_),
+        register_allocation_zone_scope_(&zone_pool_),
         register_allocation_zone_(register_allocation_zone_scope_.zone()),
         register_allocation_data_(nullptr) {}
 
@@ -166,8 +178,10 @@ class PipelineData {
 
   Isolate* isolate() const { return isolate_; }
   CompilationInfo* info() const { return info_; }
-  ZonePool* zone_pool() const { return zone_pool_; }
-  PipelineStatistics* pipeline_statistics() { return pipeline_statistics_; }
+  ZonePool* zone_pool() { return &zone_pool_; }
+  PipelineStatistics* pipeline_statistics() const {
+    return pipeline_statistics_.get();
+  }
   bool compilation_failed() const { return compilation_failed_; }
   void set_compilation_failed() { compilation_failed_ = true; }
   Handle<Code> code() { return code_; }
@@ -192,7 +206,6 @@ class PipelineData {
   void set_js_type_feedback(JSTypeFeedbackTable* js_type_feedback) {
     js_type_feedback_ = js_type_feedback;
   }
-  Typer* typer() const { return typer_.get(); }
 
   LoopAssignmentAnalysis* loop_assignment() const { return loop_assignment_; }
   void set_loop_assignment(LoopAssignmentAnalysis* loop_assignment) {
@@ -210,6 +223,11 @@ class PipelineData {
   InstructionSequence* sequence() const { return sequence_; }
   Frame* frame() const { return frame_; }
 
+  Linkage* linkage() const { return linkage_; }
+  void set_linkage(Linkage* linkage) { linkage_ = linkage; }
+
+  BasicBlockProfiler::Data* profiler_data() const { return profiler_data_; }
+
   Zone* register_allocation_zone() const { return register_allocation_zone_; }
   RegisterAllocationData* register_allocation_data() const {
     return register_allocation_data_;
@@ -218,7 +236,6 @@ class PipelineData {
   void DeleteGraphZone() {
     // Destroy objects with destructors first.
     source_positions_.Reset(nullptr);
-    typer_.Reset(nullptr);
     if (graph_zone_ == nullptr) return;
     // Destroy zone and clear pointers.
     graph_zone_scope_.Destroy();
@@ -250,6 +267,10 @@ class PipelineData {
 
   void InitializeInstructionSequence() {
     DCHECK(sequence_ == nullptr);
+    if (FLAG_turbo_profiling) {
+      profiler_data_ =
+          BasicBlockInstrumentor::Instrument(info(), graph(), schedule());
+    }
     InstructionBlocks* instruction_blocks =
         InstructionSequence::InstructionBlocksFor(instruction_zone(),
                                                   schedule());
@@ -267,12 +288,16 @@ class PipelineData {
                                sequence(), debug_name);
   }
 
+  std::ostringstream& source_position_output() {
+    return source_position_output_;
+  }
+
  private:
   Isolate* isolate_;
   CompilationInfo* info_;
   Zone* outer_zone_;
-  ZonePool* const zone_pool_;
-  PipelineStatistics* pipeline_statistics_;
+  ZonePool zone_pool_;
+  SmartPointer<PipelineStatistics> pipeline_statistics_;
   bool compilation_failed_;
   Handle<Code> code_;
 
@@ -290,8 +315,10 @@ class PipelineData {
   JSGraph* jsgraph_;
   JSTypeFeedbackTable* js_type_feedback_;
   // TODO(dcarney): make this into a ZoneObject.
-  SmartPointer<Typer> typer_;
   Schedule* schedule_;
+  Linkage* linkage_;
+  BasicBlockProfiler::Data* profiler_data_;
+  std::ostringstream source_position_output_;
 
   // All objects in the following group of fields are allocated in
   // instruction_zone_.  They are all set to NULL when the instruction_zone_ is
@@ -450,19 +477,28 @@ class PipelineRunScope {
 }  // namespace
 
 
+Pipeline::Pipeline(CompilationInfo* info) : Pipeline(new PipelineData(info)) {}
+
+
+Pipeline::~Pipeline() { delete data_; }
+
+
+CompilationInfo* Pipeline::info() const { return data()->info(); }
+
+
 template <typename Phase>
 void Pipeline::Run() {
-  PipelineRunScope scope(this->data_, Phase::phase_name());
+  PipelineRunScope scope(data(), Phase::phase_name());
   Phase phase;
-  phase.Run(this->data_, scope.zone());
+  phase.Run(data(), scope.zone());
 }
 
 
 template <typename Phase, typename Arg0>
 void Pipeline::Run(Arg0 arg_0) {
-  PipelineRunScope scope(this->data_, Phase::phase_name());
+  PipelineRunScope scope(data(), Phase::phase_name());
   Phase phase;
-  phase.Run(this->data_, scope.zone(), arg_0);
+  phase.Run(data(), scope.zone(), arg_0);
 }
 
 
@@ -522,7 +558,7 @@ struct InliningPhase {
 struct TyperPhase {
   static const char* phase_name() { return "typer"; }
 
-  void Run(PipelineData* data, Zone* temp_zone) { data->typer()->Run(); }
+  void Run(PipelineData* data, Zone* temp_zone, Typer* typer) { typer->Run(); }
 };
 
 
@@ -702,10 +738,10 @@ struct ComputeSchedulePhase {
 struct InstructionSelectionPhase {
   static const char* phase_name() { return "select instructions"; }
 
-  void Run(PipelineData* data, Zone* temp_zone, Linkage* linkage) {
+  void Run(PipelineData* data, Zone* temp_zone) {
     InstructionSelector selector(
-        temp_zone, data->graph()->NodeCount(), linkage, data->sequence(),
-        data->schedule(), data->source_positions(),
+        temp_zone, data->graph()->NodeCount(), data->linkage(),
+        data->sequence(), data->schedule(), data->source_positions(),
         data->info()->is_source_positions_enabled()
             ? InstructionSelector::kAllSourcePositions
             : InstructionSelector::kCallSourcePositions);
@@ -862,8 +898,8 @@ struct JumpThreadingPhase {
 struct GenerateCodePhase {
   static const char* phase_name() { return "generate code"; }
 
-  void Run(PipelineData* data, Zone* temp_zone, Linkage* linkage) {
-    CodeGenerator generator(data->frame(), linkage, data->sequence(),
+  void Run(PipelineData* data, Zone* temp_zone) {
+    CodeGenerator generator(data->frame(), data->linkage(), data->sequence(),
                             data->info());
     data->set_code(generator.GenerateCode());
   }
@@ -931,7 +967,7 @@ void Pipeline::RunPrintAndVerify(const char* phase, bool untyped) {
 }
 
 
-Handle<Code> Pipeline::GenerateCode() {
+bool Pipeline::CreateGraph() {
   // TODO(mstarzinger): This is just a temporary hack to make TurboFan work,
   // the correct solution is to restore the context register after invoking
   // builtins from full-codegen.
@@ -939,21 +975,13 @@ Handle<Code> Pipeline::GenerateCode() {
   for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
     Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
     Object* builtin = isolate()->js_builtins_object()->javascript_builtin(id);
-    if (*info()->closure() == builtin) return Handle<Code>::null();
+    if (*info()->closure() == builtin) return false;
   }
 
   // TODO(dslomov): support turbo optimization of subclass constructors.
   if (IsSubclassConstructor(shared->kind())) {
     shared->DisableOptimization(kSuperReference);
-    return Handle<Code>::null();
-  }
-
-  ZonePool zone_pool;
-  SmartPointer<PipelineStatistics> pipeline_statistics;
-
-  if (FLAG_turbo_stats) {
-    pipeline_statistics.Reset(new PipelineStatistics(info(), &zone_pool));
-    pipeline_statistics->BeginPhaseKind("initializing");
+    return false;
   }
 
   if (FLAG_trace_turbo) {
@@ -982,12 +1010,9 @@ Handle<Code> Pipeline::GenerateCode() {
     }
   }
 
-  PipelineData data(&zone_pool, info(), pipeline_statistics.get());
-  this->data_ = &data;
-
   if (info()->is_type_feedback_enabled()) {
-    data.set_js_type_feedback(new (data.graph_zone())
-                                  JSTypeFeedbackTable(data.graph_zone()));
+    data()->set_js_type_feedback(new (data()->graph_zone())
+                                     JSTypeFeedbackTable(data()->graph_zone()));
   }
 
   BeginPhaseKind("graph creation");
@@ -1001,14 +1026,14 @@ Handle<Code> Pipeline::GenerateCode() {
     tcf << AsC1VCompilation(info());
   }
 
-  data.source_positions()->AddDecorator();
+  data()->source_positions()->AddDecorator();
 
   if (FLAG_loop_assignment_analysis) {
     Run<LoopAssignmentAnalysisPhase>();
   }
 
   Run<GraphBuilderPhase>(info()->is_context_specializing());
-  if (data.compilation_failed()) return Handle<Code>::null();
+  if (data()->compilation_failed()) return false;
   RunPrintAndVerify("Initial untyped", true);
 
   Run<EarlyControlReductionPhase>();
@@ -1025,15 +1050,17 @@ Handle<Code> Pipeline::GenerateCode() {
 
   if (FLAG_print_turbo_replay) {
     // Print a replay of the initial graph.
-    GraphReplayPrinter::PrintReplay(data.graph());
+    GraphReplayPrinter::PrintReplay(data()->graph());
   }
 
   // Bailout here in case target architecture is not supported.
-  if (!SupportedTarget()) return Handle<Code>::null();
+  if (!SupportedTarget()) return false;
 
+  SmartPointer<Typer> typer;
   if (info()->is_typing_enabled()) {
     // Type the graph.
-    Run<TyperPhase>();
+    typer.Reset(new Typer(isolate(), data()->graph(), info()->context()));
+    Run<TyperPhase>(typer.get());
     RunPrintAndVerify("Typed");
   }
 
@@ -1079,7 +1106,7 @@ Handle<Code> Pipeline::GenerateCode() {
   } else {
     if (info()->is_osr()) {
       Run<OsrDeconstructionPhase>();
-      if (info()->bailout_reason() != kNoReason) return Handle<Code>::null();
+      if (info()->bailout_reason() != kNoReason) return false;
       RunPrintAndVerify("OSR deconstruction");
     }
   }
@@ -1091,10 +1118,21 @@ Handle<Code> Pipeline::GenerateCode() {
 
   BeginPhaseKind("block building");
 
-  data.source_positions()->RemoveDecorator();
+  data()->source_positions()->RemoveDecorator();
+  return true;
+}
+
+
+bool Pipeline::OptimizeGraph() {
+  return ScheduleAndAllocateRegisters(
+      Linkage::ComputeIncoming(data()->instruction_zone(), info()));
+}
+
 
+Handle<Code> Pipeline::GenerateCode() {
+  if (!CreateGraph()) return Handle<Code>::null();
   return ScheduleAndGenerateCode(
-      Linkage::ComputeIncoming(data.instruction_zone(), info()));
+      Linkage::ComputeIncoming(data()->instruction_zone(), info()));
 }
 
 
@@ -1122,17 +1160,15 @@ Handle<Code> Pipeline::GenerateCodeForTesting(CompilationInfo* info,
                                               Graph* graph,
                                               Schedule* schedule) {
   // Construct a pipeline for scheduling and code generation.
-  ZonePool zone_pool;
-  PipelineData data(&zone_pool, info, graph, schedule);
+  PipelineData* data = new PipelineData(info, graph, schedule);
   SmartPointer<PipelineStatistics> pipeline_statistics;
   if (FLAG_turbo_stats) {
-    pipeline_statistics.Reset(new PipelineStatistics(info, &zone_pool));
+    pipeline_statistics.Reset(new PipelineStatistics(info, data->zone_pool()));
     pipeline_statistics->BeginPhaseKind("test codegen");
   }
 
-  Pipeline pipeline(info);
-  pipeline.data_ = &data;
-  if (data.schedule() == nullptr) {
+  Pipeline pipeline(data);
+  if (data->schedule() == nullptr) {
     // TODO(rossberg): Should this really be untyped?
     pipeline.RunPrintAndVerify("Machine", true);
   }
@@ -1146,18 +1182,15 @@ bool Pipeline::AllocateRegistersForTesting(const RegisterConfiguration* config,
                                            bool run_verifier) {
   FakeStubForTesting stub(sequence->isolate());
   CompilationInfo info(&stub, sequence->isolate(), sequence->zone());
-  ZonePool zone_pool;
-  PipelineData data(&zone_pool, &info, sequence);
-  Pipeline pipeline(&info);
-  pipeline.data_ = &data;
+  PipelineData* data = new PipelineData(&info, sequence);
+  Pipeline pipeline(data);
   pipeline.AllocateRegisters(config, run_verifier);
-  return !data.compilation_failed();
+  return !data->compilation_failed();
 }
 
 
-Handle<Code> Pipeline::ScheduleAndGenerateCode(
-    CallDescriptor* call_descriptor) {
-  PipelineData* data = this->data_;
+bool Pipeline::ScheduleAndAllocateRegisters(CallDescriptor* call_descriptor) {
+  PipelineData* data = this->data();
 
   DCHECK_NOT_NULL(data->graph());
   CHECK(SupportedBackend());
@@ -1165,17 +1198,11 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
   if (data->schedule() == nullptr) Run<ComputeSchedulePhase>();
   TraceSchedule(data->info(), data->schedule());
 
-  BasicBlockProfiler::Data* profiler_data = NULL;
-  if (FLAG_turbo_profiling) {
-    profiler_data = BasicBlockInstrumentor::Instrument(info(), data->graph(),
-                                                       data->schedule());
-  }
-
   data->InitializeInstructionSequence();
 
   // Select and schedule instructions covering the scheduled graph.
-  Linkage linkage(call_descriptor);
-  Run<InstructionSelectionPhase>(&linkage);
+  data->set_linkage(new (data->info()->zone()) Linkage(call_descriptor));
+  Run<InstructionSelectionPhase>();
 
   if (FLAG_trace_turbo && !data->MayHaveUnverifiableGraph()) {
     TurboCfgFile tcf(isolate());
@@ -1183,10 +1210,9 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
                  data->sequence());
   }
 
-  std::ostringstream source_position_output;
   if (FLAG_trace_turbo) {
     // Output source position information before the graph is deleted.
-    data_->source_positions()->Print(source_position_output);
+    data->source_positions()->Print(data->source_position_output());
   }
 
   data->DeleteGraphZone();
@@ -1198,7 +1224,7 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
   AllocateRegisters(RegisterConfiguration::ArchDefault(), run_verifier);
   if (data->compilation_failed()) {
     info()->AbortOptimization(kNotEnoughVirtualRegistersRegalloc);
-    return Handle<Code>();
+    return false;
   }
 
   BeginPhaseKind("code generation");
@@ -1208,15 +1234,22 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
     Run<JumpThreadingPhase>();
   }
 
+  return true;
+}
+
+
+Handle<Code> Pipeline::DoGenerateCode() {
+  PipelineData* data = this->data_;
+
   // Generate final machine code.
-  Run<GenerateCodePhase>(&linkage);
+  Run<GenerateCodePhase>();
 
   Handle<Code> code = data->code();
-  if (profiler_data != NULL) {
+  if (data->profiler_data()) {
 #if ENABLE_DISASSEMBLER
     std::ostringstream os;
     code->Disassemble(NULL, os);
-    profiler_data->SetCode(&os);
+    data->profiler_data()->SetCode(&os);
 #endif
   }
 
@@ -1239,7 +1272,7 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
 #endif  // ENABLE_DISASSEMBLER
       json_of << "\"}\n],\n";
       json_of << "\"nodePositions\":";
-      json_of << source_position_output.str();
+      json_of << data->source_position_output().str();
       json_of << "}";
       fclose(json_file);
     }
@@ -1253,9 +1286,18 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
 }
 
 
+Handle<Code> Pipeline::ScheduleAndGenerateCode(
+    CallDescriptor* call_descriptor) {
+  if (!ScheduleAndAllocateRegisters(call_descriptor)) {
+    return Handle<Code>::null();
+  }
+  return DoGenerateCode();
+}
+
+
 void Pipeline::AllocateRegisters(const RegisterConfiguration* config,
                                  bool run_verifier) {
-  PipelineData* data = this->data_;
+  PipelineData* data = this->data();
 
   // Don't track usage for this zone in compiler stats.
   SmartPointer<Zone> verifier_zone;