src/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 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  22 #include "base/files/memory_mapped_file.h"
  23 #include "base/path_service.h"
  24 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  25
  26 namespace gin {
  27
  28 namespace {
  29
  30 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  31
  32 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  33   base::RandBytes(buffer, amount);
  34   return true;
  35 }
  36
  37 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  38 base::MemoryMappedFile* g_mapped_natives = NULL;
  39 base::MemoryMappedFile* g_mapped_snapshot = NULL;
  40
  41 bool MapV8Files(base::FilePath* natives_path, base::FilePath* snapshot_path,
  42                 int natives_fd = -1, int snapshot_fd = -1) {
  43   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
  44
  45   g_mapped_natives = new base::MemoryMappedFile;
  46   if (!g_mapped_natives->IsValid()) {
  47     if (natives_fd == -1
  48         ? !g_mapped_natives->Initialize(base::File(*natives_path, flags))
  49         : !g_mapped_natives->Initialize(base::File(natives_fd))) {
  50       delete g_mapped_natives;
  51       g_mapped_natives = NULL;
  52       LOG(FATAL) << "Couldn't mmap v8 natives data file";
  53       return false;
  54     }
  55   }
  56
  57   g_mapped_snapshot = new base::MemoryMappedFile;
  58   if (!g_mapped_snapshot->IsValid()) {
  59     if (snapshot_fd == -1
  60         ? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags))
  61         : !g_mapped_snapshot->Initialize(base::File(snapshot_fd))) {
  62       delete g_mapped_snapshot;
  63       g_mapped_snapshot = NULL;
  64       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
  65       return false;
  66     }
  67   }
  68
  69   return true;
  70 }
  71 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  72
  73 }  // namespace
  74
  75
  76 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  77 // static
  78 bool IsolateHolder::LoadV8Snapshot() {
  79   if (g_mapped_natives && g_mapped_snapshot)
  80     return true;
  81
  82   base::FilePath data_path;
  83   PathService::Get(base::DIR_ANDROID_APP_DATA, &data_path);
  84   DCHECK(!data_path.empty());
  85
  86   base::FilePath natives_path = data_path.AppendASCII("natives_blob.bin");
  87   base::FilePath snapshot_path = data_path.AppendASCII("snapshot_blob.bin");
  88
  89   return MapV8Files(&natives_path, &snapshot_path);
  90 }
  91
  92 //static
  93 bool IsolateHolder::LoadV8SnapshotFD(int natives_fd, int snapshot_fd) {
  94   if (g_mapped_natives && g_mapped_snapshot)
  95     return true;
  96
  97   return MapV8Files(NULL, NULL, natives_fd, snapshot_fd);
  98 }
  99 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 100
 101 IsolateHolder::IsolateHolder() {
 102   CHECK(g_array_buffer_allocator)
 103       << "You need to invoke gin::IsolateHolder::Initialize first";
 104   v8::Isolate::CreateParams params;
 105   params.entry_hook = DebugImpl::GetFunctionEntryHook();
 106   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
 107   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
 108                                        base::SysInfo::AmountOfVirtualMemory(),
 109                                        base::SysInfo::NumberOfProcessors());
 110   isolate_ = v8::Isolate::New(params);
 111   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
 112 #if defined(OS_WIN)
 113   {
 114     void* code_range;
 115     size_t size;
 116     isolate_->GetCodeRange(&code_range, &size);
 117     Debug::CodeRangeCreatedCallback callback =
 118         DebugImpl::GetCodeRangeCreatedCallback();
 119     if (code_range && size && callback)
 120       callback(code_range, size);
 121   }
 122 #endif
 123 }
 124
 125 IsolateHolder::~IsolateHolder() {
 126   if (task_observer_.get())
 127     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 128 #if defined(OS_WIN)
 129   {
 130     void* code_range;
 131     size_t size;
 132     isolate_->GetCodeRange(&code_range, &size);
 133     Debug::CodeRangeDeletedCallback callback =
 134         DebugImpl::GetCodeRangeDeletedCallback();
 135     if (code_range && callback)
 136       callback(code_range);
 137   }
 138 #endif
 139   isolate_data_.reset();
 140   isolate_->Dispose();
 141 }
 142
 143 // static
 144 void IsolateHolder::Initialize(ScriptMode mode,
 145                                v8::ArrayBuffer::Allocator* allocator) {
 146   CHECK(allocator);
 147   static bool v8_is_initialized = false;
 148   if (v8_is_initialized)
 149     return;
 150   v8::V8::InitializePlatform(V8Platform::Get());
 151   v8::V8::SetArrayBufferAllocator(allocator);
 152   g_array_buffer_allocator = allocator;
 153   if (mode == gin::IsolateHolder::kStrictMode) {
 154     static const char v8_flags[] = "--use_strict";
 155     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
 156   }
 157   v8::V8::SetEntropySource(&GenerateEntropy);
 158 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 159   v8::StartupData natives;
 160   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
 161   natives.raw_size = g_mapped_natives->length();
 162   natives.compressed_size = g_mapped_natives->length();
 163   v8::V8::SetNativesDataBlob(&natives);
 164
 165   v8::StartupData snapshot;
 166   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 167   snapshot.raw_size = g_mapped_snapshot->length();
 168   snapshot.compressed_size = g_mapped_snapshot->length();
 169   v8::V8::SetSnapshotDataBlob(&snapshot);
 170 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 171   v8::V8::Initialize();
 172   v8_is_initialized = true;
 173 }
 174
 175 void IsolateHolder::AddRunMicrotasksObserver() {
 176   DCHECK(!task_observer_.get());
 177   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
 178   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 179 }
 180
 181 void IsolateHolder::RemoveRunMicrotasksObserver() {
 182   DCHECK(task_observer_.get());
 183   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 184   task_observer_.reset();
 185 }
 186
 187 }  // namespace gin