// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/extensions/statistics-extension.h"

#include "src/counters.h"
#include "src/heap/heap-inl.h"
#include "src/isolate.h"

namespace v8 {
namespace internal {

const char* const StatisticsExtension::kSource =
    "native function getV8Statistics();";


v8::Local<v8::FunctionTemplate> StatisticsExtension::GetNativeFunctionTemplate(
    v8::Isolate* isolate, v8::Local<v8::String> str) {
  DCHECK(strcmp(*v8::String::Utf8Value(str), "getV8Statistics") == 0);
  return v8::FunctionTemplate::New(isolate, StatisticsExtension::GetCounters);
}


static void AddCounter(v8::Isolate* isolate,
                       v8::Local<v8::Object> object,
                       StatsCounter* counter,
                       const char* name) {
  if (counter->Enabled()) {
    object->Set(isolate->GetCurrentContext(),
                v8::String::NewFromUtf8(isolate, name, NewStringType::kNormal)
                    .ToLocalChecked(),
                v8::Number::New(isolate, *counter->GetInternalPointer()))
        .FromJust();
  }
}

static void AddNumber(v8::Isolate* isolate,
                      v8::Local<v8::Object> object,
                      intptr_t value,
                      const char* name) {
  object->Set(isolate->GetCurrentContext(),
              v8::String::NewFromUtf8(isolate, name, NewStringType::kNormal)
                  .ToLocalChecked(),
              v8::Number::New(isolate, static_cast<double>(value))).FromJust();
}


static void AddNumber64(v8::Isolate* isolate,
                        v8::Local<v8::Object> object,
                        int64_t value,
                        const char* name) {
  object->Set(isolate->GetCurrentContext(),
              v8::String::NewFromUtf8(isolate, name, NewStringType::kNormal)
                  .ToLocalChecked(),
              v8::Number::New(isolate, static_cast<double>(value))).FromJust();
}


void StatisticsExtension::GetCounters(
    const v8::FunctionCallbackInfo<v8::Value>& args) {
  Isolate* isolate = reinterpret_cast<Isolate*>(args.GetIsolate());
  Heap* heap = isolate->heap();

  if (args.Length() > 0) {  // GC if first argument evaluates to true.
    if (args[0]->IsBoolean() &&
        args[0]
            ->BooleanValue(args.GetIsolate()->GetCurrentContext())
            .FromMaybe(false)) {
      heap->CollectAllGarbage(Heap::kNoGCFlags, "counters extension");
    }
  }

  Counters* counters = isolate->counters();
  v8::Local<v8::Object> result = v8::Object::New(args.GetIsolate());

  struct StatisticsCounter {
    v8::internal::StatsCounter* counter;
    const char* name;
  };
  const StatisticsCounter counter_list[] = {
#define ADD_COUNTER(name, caption) \
  { counters->name(), #name }      \
  ,

      STATS_COUNTER_LIST_1(ADD_COUNTER) STATS_COUNTER_LIST_2(ADD_COUNTER)
#undef ADD_COUNTER
#define ADD_COUNTER(name)                            \
  { counters->count_of_##name(), "count_of_" #name } \
  , {counters->size_of_##name(), "size_of_" #name},

          INSTANCE_TYPE_LIST(ADD_COUNTER)
#undef ADD_COUNTER
#define ADD_COUNTER(name)                                                \
  { counters->count_of_CODE_TYPE_##name(), "count_of_CODE_TYPE_" #name } \
  , {counters->size_of_CODE_TYPE_##name(), "size_of_CODE_TYPE_" #name},

              CODE_KIND_LIST(ADD_COUNTER)
#undef ADD_COUNTER
#define ADD_COUNTER(name)                                                    \
  { counters->count_of_FIXED_ARRAY_##name(), "count_of_FIXED_ARRAY_" #name } \
  , {counters->size_of_FIXED_ARRAY_##name(), "size_of_FIXED_ARRAY_" #name},

                  FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(ADD_COUNTER)
#undef ADD_COUNTER
  };  // End counter_list array.

  for (size_t i = 0; i < arraysize(counter_list); i++) {
    AddCounter(args.GetIsolate(), result, counter_list[i].counter,
               counter_list[i].name);
  }

  struct StatisticNumber {
    intptr_t number;
    const char* name;
  };

  const StatisticNumber numbers[] = {
      {heap->memory_allocator()->Size(), "total_committed_bytes"},
      {heap->new_space()->Size(), "new_space_live_bytes"},
      {heap->new_space()->Available(), "new_space_available_bytes"},
      {heap->new_space()->CommittedMemory(), "new_space_commited_bytes"},
      {heap->old_space()->Size(), "old_space_live_bytes"},
      {heap->old_space()->Available(), "old_space_available_bytes"},
      {heap->old_space()->CommittedMemory(), "old_space_commited_bytes"},
      {heap->code_space()->Size(), "code_space_live_bytes"},
      {heap->code_space()->Available(), "code_space_available_bytes"},
      {heap->code_space()->CommittedMemory(), "code_space_commited_bytes"},
      {heap->lo_space()->Size(), "lo_space_live_bytes"},
      {heap->lo_space()->Available(), "lo_space_available_bytes"},
      {heap->lo_space()->CommittedMemory(), "lo_space_commited_bytes"},
  };

  for (size_t i = 0; i < arraysize(numbers); i++) {
    AddNumber(args.GetIsolate(), result, numbers[i].number, numbers[i].name);
  }

  AddNumber64(args.GetIsolate(), result, heap->external_memory(),
              "amount_of_external_allocated_memory");
  args.GetReturnValue().Set(result);
}

}  // namespace internal
}  // namespace v8