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/debug_impl.h"
  15 #include "gin/function_template.h"
  16 #include "gin/per_isolate_data.h"
  17 #include "gin/public/v8_platform.h"
  18
  19 namespace gin {
  20
  21 namespace {
  22
  23 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  24
  25 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  26   base::RandBytes(buffer, amount);
  27   return true;
  28 }
  29
  30 }  // namespace
  31
  32 IsolateHolder::IsolateHolder() {
  33   CHECK(g_array_buffer_allocator)
  34       << "You need to invoke gin::IsolateHolder::Initialize first";
  35   v8::Isolate::CreateParams params;
  36   params.entry_hook = DebugImpl::GetFunctionEntryHook();
  37   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
  38   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
  39                                        base::SysInfo::AmountOfVirtualMemory(),
  40                                        base::SysInfo::NumberOfProcessors());
  41   isolate_ = v8::Isolate::New(params);
  42   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
  43 }
  44
  45 IsolateHolder::~IsolateHolder() {
  46   isolate_data_.reset();
  47   isolate_->Dispose();
  48 }
  49
  50 // static
  51 void IsolateHolder::Initialize(ScriptMode mode,
  52                                v8::ArrayBuffer::Allocator* allocator) {
  53   CHECK(allocator);
  54   static bool v8_is_initialized = false;
  55   if (v8_is_initialized)
  56     return;
  57   v8::V8::InitializePlatform(V8Platform::Get());
  58   v8::V8::SetArrayBufferAllocator(allocator);
  59   g_array_buffer_allocator = allocator;
  60   if (mode == gin::IsolateHolder::kStrictMode) {
  61     static const char v8_flags[] = "--use_strict";
  62     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
  63   }
  64   v8::V8::SetEntropySource(&GenerateEntropy);
  65   v8::V8::Initialize();
  66   v8_is_initialized = true;
  67 }
  68
  69 }  // namespace gin