gin/isolate_holder.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gin/public/isolate_holder.h"
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9
  10 #include "base/logging.h"
  11 #include "base/rand_util.h"
  12 #include "base/sys_info.h"
  13 #include "gin/array_buffer.h"
  14 #include "gin/function_template.h"
  15 #include "gin/per_isolate_data.h"
  16
  17 namespace gin {
  18
  19 namespace {
  20
  21 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  22   base::RandBytes(buffer, amount);
  23   return true;
  24 }
  25
  26
  27 void EnsureV8Initialized(bool gin_managed) {
  28   static bool v8_is_initialized = false;
  29   static bool v8_is_gin_managed = false;
  30   if (v8_is_initialized) {
  31     CHECK_EQ(v8_is_gin_managed, gin_managed);
  32     return;
  33   }
  34   v8_is_initialized = true;
  35   v8_is_gin_managed = gin_managed;
  36   if (!gin_managed)
  37     return;
  38
  39   v8::V8::SetArrayBufferAllocator(ArrayBufferAllocator::SharedInstance());
  40   static const char v8_flags[] = "--use_strict --harmony";
  41   v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
  42   v8::V8::SetEntropySource(&GenerateEntropy);
  43   v8::V8::Initialize();
  44 }
  45
  46 }  // namespace
  47
  48 IsolateHolder::IsolateHolder()
  49   : isolate_owner_(true) {
  50   EnsureV8Initialized(true);
  51   isolate_ = v8::Isolate::New();
  52   v8::ResourceConstraints constraints;
  53   constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
  54                                 base::SysInfo::NumberOfProcessors());
  55   v8::SetResourceConstraints(isolate_, &constraints);
  56   Init();
  57 }
  58
  59 IsolateHolder::IsolateHolder(v8::Isolate* isolate)
  60     : isolate_owner_(false),
  61       isolate_(isolate) {
  62   EnsureV8Initialized(false);
  63   Init();
  64 }
  65
  66 IsolateHolder::~IsolateHolder() {
  67   isolate_data_.reset();
  68   if (isolate_owner_)
  69     isolate_->Dispose();
  70 }
  71
  72 void IsolateHolder::Init() {
  73   v8::Isolate::Scope isolate_scope(isolate_);
  74   v8::HandleScope handle_scope(isolate_);
  75   isolate_data_.reset(new PerIsolateData(isolate_));
  76 }
  77
  78 }  // namespace gin