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/message_loop/message_loop.h"
  12 #include "base/rand_util.h"
  13 #include "base/sys_info.h"
  14 #include "gin/array_buffer.h"
  15 #include "gin/debug_impl.h"
  16 #include "gin/function_template.h"
  17 #include "gin/per_isolate_data.h"
  18 #include "gin/public/v8_platform.h"
  19 #include "gin/run_microtasks_observer.h"
  20
  21 namespace gin {
  22
  23 namespace {
  24
  25 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  26
  27 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  28   base::RandBytes(buffer, amount);
  29   return true;
  30 }
  31
  32 }  // namespace
  33
  34 IsolateHolder::IsolateHolder() {
  35   CHECK(g_array_buffer_allocator)
  36       << "You need to invoke gin::IsolateHolder::Initialize first";
  37   v8::Isolate::CreateParams params;
  38   params.entry_hook = DebugImpl::GetFunctionEntryHook();
  39   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
  40   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
  41                                        base::SysInfo::AmountOfVirtualMemory(),
  42                                        base::SysInfo::NumberOfProcessors());
  43   isolate_ = v8::Isolate::New(params);
  44   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
  45 #if defined(OS_WIN)
  46   {
  47     void* code_range;
  48     size_t size;
  49     isolate_->GetCodeRange(&code_range, &size);
  50     Debug::CodeRangeCreatedCallback callback =
  51         DebugImpl::GetCodeRangeCreatedCallback();
  52     if (code_range && size && callback)
  53       callback(code_range, size);
  54   }
  55 #endif
  56 }
  57
  58 IsolateHolder::~IsolateHolder() {
  59   if (task_observer_.get())
  60     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
  61 #if defined(OS_WIN)
  62   {
  63     void* code_range;
  64     size_t size;
  65     isolate_->GetCodeRange(&code_range, &size);
  66     Debug::CodeRangeDeletedCallback callback =
  67         DebugImpl::GetCodeRangeDeletedCallback();
  68     if (code_range && callback)
  69       callback(code_range);
  70   }
  71 #endif
  72   isolate_data_.reset();
  73   isolate_->Dispose();
  74 }
  75
  76 // static
  77 void IsolateHolder::Initialize(ScriptMode mode,
  78                                v8::ArrayBuffer::Allocator* allocator) {
  79   CHECK(allocator);
  80   static bool v8_is_initialized = false;
  81   if (v8_is_initialized)
  82     return;
  83   v8::V8::InitializePlatform(V8Platform::Get());
  84   v8::V8::SetArrayBufferAllocator(allocator);
  85   g_array_buffer_allocator = allocator;
  86   if (mode == gin::IsolateHolder::kStrictMode) {
  87     static const char v8_flags[] = "--use_strict";
  88     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
  89   }
  90   v8::V8::SetEntropySource(&GenerateEntropy);
  91   v8::V8::Initialize();
  92   v8_is_initialized = true;
  93 }
  94
  95 void IsolateHolder::AddRunMicrotasksObserver() {
  96   DCHECK(!task_observer_.get());
  97   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
  98   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
  99 }
 100
 101 void IsolateHolder::RemoveRunMicrotasksObserver() {
 102   DCHECK(task_observer_.get());
 103   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 104   task_observer_.reset();
 105 }
 106
 107 }  // namespace gin