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/files/memory_mapped_file.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/rand_util.h"
  14 #include "base/sys_info.h"
  15 #include "gin/array_buffer.h"
  16 #include "gin/debug_impl.h"
  17 #include "gin/function_template.h"
  18 #include "gin/per_isolate_data.h"
  19 #include "gin/public/v8_platform.h"
  20 #include "gin/run_microtasks_observer.h"
  21
  22 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  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 base::MemoryMappedFile* g_mapped_natives = NULL;
  38 base::MemoryMappedFile* g_mapped_snapshot = NULL;
  39
  40 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  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(
  84 #if defined(OS_ANDROID)
  85     base::DIR_ANDROID_APP_DATA,
  86 #elif defined(OS_POSIX)
  87     base::DIR_EXE,
  88 #endif
  89     &data_path);
  90   DCHECK(!data_path.empty());
  91
  92   base::FilePath natives_path = data_path.AppendASCII("natives_blob.bin");
  93   base::FilePath snapshot_path = data_path.AppendASCII("snapshot_blob.bin");
  94
  95   return MapV8Files(&natives_path, &snapshot_path);
  96 }
  97
  98 //static
  99 bool IsolateHolder::LoadV8SnapshotFD(int natives_fd, int snapshot_fd) {
 100   if (g_mapped_natives && g_mapped_snapshot)
 101     return true;
 102
 103   return MapV8Files(NULL, NULL, natives_fd, snapshot_fd);
 104 }
 105 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 106
 107 //static
 108 void IsolateHolder::GetV8ExternalSnapshotData(const char** natives_data_out,
 109                                               int* natives_size_out,
 110                                               const char** snapshot_data_out,
 111                                               int* snapshot_size_out) {
 112   if (!g_mapped_natives || !g_mapped_snapshot) {
 113     *natives_data_out = *snapshot_data_out = NULL;
 114     *natives_size_out = *snapshot_size_out = 0;
 115     return;
 116   }
 117   *natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data());
 118   *snapshot_data_out = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 119   *natives_size_out = static_cast<int>(g_mapped_natives->length());
 120   *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
 121 }
 122
 123 IsolateHolder::IsolateHolder() {
 124   CHECK(g_array_buffer_allocator)
 125       << "You need to invoke gin::IsolateHolder::Initialize first";
 126   v8::Isolate::CreateParams params;
 127   params.entry_hook = DebugImpl::GetFunctionEntryHook();
 128   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
 129   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
 130                                        base::SysInfo::AmountOfVirtualMemory(),
 131                                        base::SysInfo::NumberOfProcessors());
 132   isolate_ = v8::Isolate::New(params);
 133   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
 134 #if defined(OS_WIN)
 135   {
 136     void* code_range;
 137     size_t size;
 138     isolate_->GetCodeRange(&code_range, &size);
 139     Debug::CodeRangeCreatedCallback callback =
 140         DebugImpl::GetCodeRangeCreatedCallback();
 141     if (code_range && size && callback)
 142       callback(code_range, size);
 143   }
 144 #endif
 145 }
 146
 147 IsolateHolder::~IsolateHolder() {
 148   if (task_observer_.get())
 149     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 150 #if defined(OS_WIN)
 151   {
 152     void* code_range;
 153     size_t size;
 154     isolate_->GetCodeRange(&code_range, &size);
 155     Debug::CodeRangeDeletedCallback callback =
 156         DebugImpl::GetCodeRangeDeletedCallback();
 157     if (code_range && callback)
 158       callback(code_range);
 159   }
 160 #endif
 161   isolate_data_.reset();
 162   isolate_->Dispose();
 163 }
 164
 165 // static
 166 void IsolateHolder::Initialize(ScriptMode mode,
 167                                v8::ArrayBuffer::Allocator* allocator) {
 168   CHECK(allocator);
 169   static bool v8_is_initialized = false;
 170   if (v8_is_initialized)
 171     return;
 172   v8::V8::InitializePlatform(V8Platform::Get());
 173   v8::V8::SetArrayBufferAllocator(allocator);
 174   g_array_buffer_allocator = allocator;
 175   if (mode == gin::IsolateHolder::kStrictMode) {
 176     static const char v8_flags[] = "--use_strict";
 177     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
 178   }
 179   v8::V8::SetEntropySource(&GenerateEntropy);
 180 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 181   v8::StartupData natives;
 182   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
 183   natives.raw_size = static_cast<int>(g_mapped_natives->length());
 184   v8::V8::SetNativesDataBlob(&natives);
 185
 186   v8::StartupData snapshot;
 187   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 188   snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
 189   v8::V8::SetSnapshotDataBlob(&snapshot);
 190 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 191   v8::V8::Initialize();
 192   v8_is_initialized = true;
 193 }
 194
 195 void IsolateHolder::AddRunMicrotasksObserver() {
 196   DCHECK(!task_observer_.get());
 197   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
 198   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 199 }
 200
 201 void IsolateHolder::RemoveRunMicrotasksObserver() {
 202   DCHECK(task_observer_.get());
 203   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 204   task_observer_.reset();
 205 }
 206
 207 }  // namespace gin