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 #include "gin/public/v8_platform.h"
  17
  18 namespace gin {
  19
  20 namespace {
  21
  22 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  23   base::RandBytes(buffer, amount);
  24   return true;
  25 }
  26
  27 void EnsureV8Initialized(gin::IsolateHolder::ScriptMode mode,
  28                          bool gin_managed) {
  29   static bool v8_is_initialized = false;
  30   static bool v8_is_gin_managed = false;
  31   if (v8_is_initialized) {
  32     CHECK_EQ(v8_is_gin_managed, gin_managed);
  33     return;
  34   }
  35   v8_is_initialized = true;
  36   v8_is_gin_managed = gin_managed;
  37   if (!gin_managed)
  38     return;
  39
  40   v8::V8::InitializePlatform(V8Platform::Get());
  41   v8::V8::SetArrayBufferAllocator(ArrayBufferAllocator::SharedInstance());
  42   if (mode == gin::IsolateHolder::kStrictMode) {
  43     static const char v8_flags[] = "--use_strict --harmony_promises";
  44     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
  45   }
  46   v8::V8::SetEntropySource(&GenerateEntropy);
  47   v8::V8::Initialize();
  48 }
  49
  50 }  // namespace
  51
  52 IsolateHolder::IsolateHolder(ScriptMode mode)
  53   : isolate_owner_(true) {
  54   EnsureV8Initialized(mode, true);
  55   isolate_ = v8::Isolate::New();
  56   v8::ResourceConstraints constraints;
  57   constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
  58                                 base::SysInfo::AmountOfVirtualMemory(),
  59                                 base::SysInfo::NumberOfProcessors());
  60   v8::SetResourceConstraints(isolate_, &constraints);
  61   Init(ArrayBufferAllocator::SharedInstance());
  62 }
  63
  64 IsolateHolder::IsolateHolder(v8::Isolate* isolate,
  65                              v8::ArrayBuffer::Allocator* allocator)
  66     : isolate_owner_(false), isolate_(isolate) {
  67   EnsureV8Initialized(kNonStrictMode, false);
  68   Init(allocator);
  69 }
  70
  71 IsolateHolder::~IsolateHolder() {
  72   isolate_data_.reset();
  73   if (isolate_owner_)
  74     isolate_->Dispose();
  75 }
  76
  77 void IsolateHolder::Init(v8::ArrayBuffer::Allocator* allocator) {
  78   v8::Isolate::Scope isolate_scope(isolate_);
  79   v8::HandleScope handle_scope(isolate_);
  80   isolate_data_.reset(new PerIsolateData(isolate_, allocator));
  81 }
  82
  83 }  // namespace gin