Merge nodejs/master

Merge 1c07724 as of 2017-10-28.
This is an automatically created merge. For any problems please
contact @kunalspathak.

Author: chakrabot

common.gypi

@@ -29,7 +29,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.4',
+    'v8_embedder_string': '-node.7',
 
     # Enable disassembler for `--print-code` v8 options
     'v8_enable_disassembler': 1,

deps/v8/src/heap/gc-tracer.cc

@@ -490,6 +490,8 @@ void GCTracer::PrintNVP() const {
           "promotion_rate=%.1f%% "
           "semi_space_copy_rate=%.1f%% "
           "new_space_allocation_throughput=%.1f "
+          "unmapper_chunks=%d "
+          "unmapper_delayed_chunks=%d "
           "context_disposal_rate=%.1f\n",
           duration, spent_in_mutator, current_.TypeName(true),
           current_.reduce_memory, current_.scopes[Scope::HEAP_PROLOGUE],
@@ -520,6 +522,8 @@ void GCTracer::PrintNVP() const {
           AverageSurvivalRatio(), heap_->promotion_rate_,
           heap_->semi_space_copied_rate_,
           NewSpaceAllocationThroughputInBytesPerMillisecond(),
+          heap_->memory_allocator()->unmapper()->NumberOfChunks(),
+          heap_->memory_allocator()->unmapper()->NumberOfDelayedChunks(),
           ContextDisposalRateInMilliseconds());
       break;
     case Event::MINOR_MARK_COMPACTOR:
@@ -654,6 +658,8 @@ void GCTracer::PrintNVP() const {
           "promotion_rate=%.1f%% "
           "semi_space_copy_rate=%.1f%% "
           "new_space_allocation_throughput=%.1f "
+          "unmapper_chunks=%d "
+          "unmapper_delayed_chunks=%d "
           "context_disposal_rate=%.1f "
           "compaction_speed=%.f\n",
           duration, spent_in_mutator, current_.TypeName(true),
@@ -731,6 +737,8 @@ void GCTracer::PrintNVP() const {
           AverageSurvivalRatio(), heap_->promotion_rate_,
           heap_->semi_space_copied_rate_,
           NewSpaceAllocationThroughputInBytesPerMillisecond(),
+          heap_->memory_allocator()->unmapper()->NumberOfChunks(),
+          heap_->memory_allocator()->unmapper()->NumberOfDelayedChunks(),
           ContextDisposalRateInMilliseconds(),
           CompactionSpeedInBytesPerMillisecond());
       break;

deps/v8/src/heap/heap.cc

@@ -1885,6 +1885,12 @@ void Heap::Scavenge() {
   IncrementalMarking::PauseBlackAllocationScope pause_black_allocation(
       incremental_marking());
 
+  if (mark_compact_collector()->sweeper().sweeping_in_progress() &&
+      memory_allocator_->unmapper()->NumberOfDelayedChunks() >
+          static_cast<int>(new_space_->MaximumCapacity() / Page::kPageSize)) {
+    mark_compact_collector()->EnsureSweepingCompleted();
+  }
+
   mark_compact_collector()->sweeper().EnsureNewSpaceCompleted();
 
   SetGCState(SCAVENGE);

deps/v8/src/heap/spaces.cc

@@ -408,6 +408,15 @@ void MemoryAllocator::Unmapper::ReconsiderDelayedChunks() {
   }
 }
 
+int MemoryAllocator::Unmapper::NumberOfChunks() {
+  base::LockGuard<base::Mutex> guard(&mutex_);
+  size_t result = 0;
+  for (int i = 0; i < kNumberOfChunkQueues; i++) {
+    result += chunks_[i].size();
+  }
+  return static_cast<int>(result);
+}
+
 bool MemoryAllocator::CanFreeMemoryChunk(MemoryChunk* chunk) {
   MarkCompactCollector* mc = isolate_->heap()->mark_compact_collector();
   // We cannot free a memory chunk in new space while the sweeper is running

deps/v8/src/heap/spaces.h

@@ -1199,6 +1199,13 @@ class V8_EXPORT_PRIVATE MemoryAllocator {
 
     bool has_delayed_chunks() { return delayed_regular_chunks_.size() > 0; }
 
+    int NumberOfDelayedChunks() {
+      base::LockGuard<base::Mutex> guard(&mutex_);
+      return static_cast<int>(delayed_regular_chunks_.size());
+    }
+
+    int NumberOfChunks();
+
    private:
     static const int kReservedQueueingSlots = 64;
     static const int kMaxUnmapperTasks = 24;

lib/internal/loader/Loader.js

@@ -2,10 +2,7 @@
 
 const { getURLFromFilePath } = require('internal/url');
 
-const {
-  getNamespaceOfModuleWrap,
-  createDynamicModule
-} = require('internal/loader/ModuleWrap');
+const { createDynamicModule } = require('internal/loader/ModuleWrap');
 
 const ModuleMap = require('internal/loader/ModuleMap');
 const ModuleJob = require('internal/loader/ModuleJob');
@@ -100,7 +97,7 @@ class Loader {
   async import(specifier, parentURL = this.base) {
     const job = await this.getModuleJob(specifier, parentURL);
     const module = await job.run();
-    return getNamespaceOfModuleWrap(module);
+    return module.namespace();
   }
 }
 Object.setPrototypeOf(Loader.prototype, null);

lib/internal/loader/ModuleWrap.js

@@ -5,13 +5,6 @@ const debug = require('util').debuglog('esm');
 const ArrayJoin = Function.call.bind(Array.prototype.join);
 const ArrayMap = Function.call.bind(Array.prototype.map);
 
-const getNamespaceOfModuleWrap = (m) => {
-  const tmp = new ModuleWrap('import * as _ from "";_;', '');
-  tmp.link(async () => m);
-  tmp.instantiate();
-  return tmp.evaluate();
-};
-
 const createDynamicModule = (exports, url = '', evaluate) => {
   debug(
     `creating ESM facade for ${url} with exports: ${ArrayJoin(exports, ', ')}`
@@ -56,6 +49,5 @@ const createDynamicModule = (exports, url = '', evaluate) => {
 
 module.exports = {
   createDynamicModule,
-  getNamespaceOfModuleWrap,
   ModuleWrap
 };

lib/module.js

@@ -431,11 +431,12 @@ Module._load = function(request, parent, isMain) {
         ESMLoader = new Loader();
         const userLoader = process.binding('config').userLoader;
         if (userLoader) {
-          const hooks = await new Loader().import(userLoader);
+          const hooks = await ESMLoader.import(userLoader);
+          ESMLoader = new Loader();
           ESMLoader.hook(hooks);
         }
       }
-      await ESMLoader.import(getURLFromFilePath(request).href);
+      await ESMLoader.import(getURLFromFilePath(request).pathname);
     })()
     .catch((e) => {
       console.error(e);

src/module_wrap.cc

@@ -207,6 +207,29 @@ void ModuleWrap::Evaluate(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(ret);
 }
 
+void ModuleWrap::Namespace(const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  auto isolate = args.GetIsolate();
+  auto that = args.This();
+  ModuleWrap* obj = Unwrap<ModuleWrap>(that);
+  CHECK_NE(obj, nullptr);
+
+  auto module = obj->module_.Get(isolate);
+
+  switch (module->GetStatus()) {
+    default:
+      return env->ThrowError(
+          "cannot get namespace, Module has not been instantiated");
+    case v8::Module::Status::kInstantiated:
+    case v8::Module::Status::kEvaluating:
+    case v8::Module::Status::kEvaluated:
+      break;
+  }
+
+  auto result = module->GetModuleNamespace();
+  args.GetReturnValue().Set(result);
+}
+
 MaybeLocal<Module> ModuleWrap::ResolveCallback(Local<Context> context,
                                                Local<String> specifier,
                                                Local<Module> referrer) {
@@ -520,6 +543,7 @@ void ModuleWrap::Initialize(Local<Object> target,
   env->SetProtoMethod(tpl, "link", Link);
   env->SetProtoMethod(tpl, "instantiate", Instantiate);
   env->SetProtoMethod(tpl, "evaluate", Evaluate);
+  env->SetProtoMethod(tpl, "namespace", Namespace);
 
   target->Set(FIXED_ONE_BYTE_STRING(isolate, "ModuleWrap"), tpl->GetFunction());
   env->SetMethod(target, "resolve", node::loader::ModuleWrap::Resolve);

src/module_wrap.h

@@ -34,6 +34,7 @@ class ModuleWrap : public BaseObject {
   static void Link(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Instantiate(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Evaluate(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void Namespace(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void GetUrl(v8::Local<v8::String> property,
                      const v8::PropertyCallbackInfo<v8::Value>& info);
   static void Resolve(const v8::FunctionCallbackInfo<v8::Value>& args);