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/strings/sys_string_conversions.h"
  15 #include "base/sys_info.h"
  16 #include "crypto/sha2.h"
  17 #include "gin/array_buffer.h"
  18 #include "gin/debug_impl.h"
  19 #include "gin/function_template.h"
  20 #include "gin/per_isolate_data.h"
  21 #include "gin/public/v8_platform.h"
  22 #include "gin/run_microtasks_observer.h"
  23
  24 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  25 #if defined(OS_MACOSX)
  26 #include "base/mac/foundation_util.h"
  27 #endif  // OS_MACOSX
  28 #include "base/path_service.h"
  29 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  30
  31 namespace gin {
  32
  33 namespace {
  34
  35 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  36
  37 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  38   base::RandBytes(buffer, amount);
  39   return true;
  40 }
  41
  42 base::MemoryMappedFile* g_mapped_natives = NULL;
  43 base::MemoryMappedFile* g_mapped_snapshot = NULL;
  44
  45 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  46 bool MapV8Files(base::FilePath* natives_path,
  47                 base::FilePath* snapshot_path,
  48                 int natives_fd = -1,
  49                 int snapshot_fd = -1,
  50                 base::MemoryMappedFile::Region natives_region =
  51                     base::MemoryMappedFile::Region::kWholeFile,
  52                 base::MemoryMappedFile::Region snapshot_region =
  53                     base::MemoryMappedFile::Region::kWholeFile) {
  54   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
  55
  56   g_mapped_natives = new base::MemoryMappedFile;
  57   if (!g_mapped_natives->IsValid()) {
  58 #if !defined(OS_WIN)
  59     if (natives_fd == -1
  60             ? !g_mapped_natives->Initialize(base::File(*natives_path, flags),
  61                                             natives_region)
  62             : !g_mapped_natives->Initialize(base::File(natives_fd),
  63                                             natives_region)) {
  64 #else
  65     if (!g_mapped_natives->Initialize(base::File(*natives_path, flags),
  66                                       natives_region)) {
  67 #endif  // !OS_WIN
  68       delete g_mapped_natives;
  69       g_mapped_natives = NULL;
  70       LOG(FATAL) << "Couldn't mmap v8 natives data file";
  71       return false;
  72     }
  73   }
  74
  75   g_mapped_snapshot = new base::MemoryMappedFile;
  76   if (!g_mapped_snapshot->IsValid()) {
  77 #if !defined(OS_WIN)
  78     if (snapshot_fd == -1
  79             ? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags),
  80                                              snapshot_region)
  81             : !g_mapped_snapshot->Initialize(base::File(snapshot_fd),
  82                                              snapshot_region)) {
  83 #else
  84     if (!g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags),
  85                                        snapshot_region)) {
  86 #endif  // !OS_WIN
  87       delete g_mapped_snapshot;
  88       g_mapped_snapshot = NULL;
  89       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
  90       return false;
  91     }
  92   }
  93
  94   return true;
  95 }
  96
  97 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
  98 bool VerifyV8SnapshotFile(base::MemoryMappedFile* snapshot_file,
  99                           const unsigned char* fingerprint) {
 100   unsigned char output[crypto::kSHA256Length];
 101   crypto::SHA256HashString(
 102       base::StringPiece(reinterpret_cast<const char*>(snapshot_file->data()),
 103                         snapshot_file->length()),
 104       output, sizeof(output));
 105   return !memcmp(fingerprint, output, sizeof(output));
 106 }
 107 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 108 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 109
 110 }  // namespace
 111
 112 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 113
 114 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
 115 // Defined in gen/gin/v8_snapshot_fingerprint.cc
 116 extern const unsigned char g_natives_fingerprint[];
 117 extern const unsigned char g_snapshot_fingerprint[];
 118 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 119
 120 #if !defined(OS_MACOSX)
 121 const int IsolateHolder::kV8SnapshotBasePathKey =
 122 #if defined(OS_ANDROID)
 123     base::DIR_ANDROID_APP_DATA;
 124 #elif defined(OS_POSIX)
 125     base::DIR_EXE;
 126 #elif defined(OS_WIN)
 127     base::DIR_MODULE;
 128 #endif  // OS_ANDROID
 129 #endif  // !OS_MACOSX
 130
 131 const char IsolateHolder::kNativesFileName[] = "natives_blob.bin";
 132 const char IsolateHolder::kSnapshotFileName[] = "snapshot_blob.bin";
 133
 134 // static
 135 bool IsolateHolder::LoadV8Snapshot() {
 136   if (g_mapped_natives && g_mapped_snapshot)
 137     return true;
 138
 139 #if !defined(OS_MACOSX)
 140   base::FilePath data_path;
 141   PathService::Get(kV8SnapshotBasePathKey, &data_path);
 142   DCHECK(!data_path.empty());
 143
 144   base::FilePath natives_path = data_path.AppendASCII(kNativesFileName);
 145   base::FilePath snapshot_path = data_path.AppendASCII(kSnapshotFileName);
 146 #else  // !defined(OS_MACOSX)
 147   base::ScopedCFTypeRef<CFStringRef> natives_file_name(
 148       base::SysUTF8ToCFStringRef(kNativesFileName));
 149   base::FilePath natives_path = base::mac::PathForFrameworkBundleResource(
 150       natives_file_name);
 151   base::ScopedCFTypeRef<CFStringRef> snapshot_file_name(
 152       base::SysUTF8ToCFStringRef(kSnapshotFileName));
 153   base::FilePath snapshot_path = base::mac::PathForFrameworkBundleResource(
 154       snapshot_file_name);
 155   DCHECK(!natives_path.empty());
 156   DCHECK(!snapshot_path.empty());
 157 #endif  // !defined(OS_MACOSX)
 158
 159   if (!MapV8Files(&natives_path, &snapshot_path))
 160     return false;
 161
 162 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
 163   return VerifyV8SnapshotFile(g_mapped_natives, g_natives_fingerprint) &&
 164          VerifyV8SnapshotFile(g_mapped_snapshot, g_snapshot_fingerprint);
 165 #else
 166   return true;
 167 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 168 }
 169
 170 //static
 171 bool IsolateHolder::LoadV8SnapshotFd(int natives_fd,
 172                                int64 natives_offset,
 173                                int64 natives_size,
 174                                int snapshot_fd,
 175                                int64 snapshot_offset,
 176                                int64 snapshot_size) {
 177   if (g_mapped_natives && g_mapped_snapshot)
 178     return true;
 179
 180   base::MemoryMappedFile::Region natives_region =
 181       base::MemoryMappedFile::Region::kWholeFile;
 182   if (natives_size != 0 || natives_offset != 0) {
 183     natives_region =
 184         base::MemoryMappedFile::Region(natives_offset, natives_size);
 185   }
 186
 187   base::MemoryMappedFile::Region snapshot_region =
 188       base::MemoryMappedFile::Region::kWholeFile;
 189   if (natives_size != 0 || natives_offset != 0) {
 190     snapshot_region =
 191         base::MemoryMappedFile::Region(snapshot_offset, snapshot_size);
 192   }
 193
 194   return MapV8Files(
 195       NULL, NULL, natives_fd, snapshot_fd, natives_region, snapshot_region);
 196 }
 197 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 198
 199 //static
 200 void IsolateHolder::GetV8ExternalSnapshotData(const char** natives_data_out,
 201                                               int* natives_size_out,
 202                                               const char** snapshot_data_out,
 203                                               int* snapshot_size_out) {
 204   if (!g_mapped_natives || !g_mapped_snapshot) {
 205     *natives_data_out = *snapshot_data_out = NULL;
 206     *natives_size_out = *snapshot_size_out = 0;
 207     return;
 208   }
 209   *natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data());
 210   *snapshot_data_out = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 211   *natives_size_out = static_cast<int>(g_mapped_natives->length());
 212   *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
 213 }
 214
 215 IsolateHolder::IsolateHolder() {
 216   CHECK(g_array_buffer_allocator)
 217       << "You need to invoke gin::IsolateHolder::Initialize first";
 218   v8::Isolate::CreateParams params;
 219   params.entry_hook = DebugImpl::GetFunctionEntryHook();
 220   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
 221   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
 222                                        base::SysInfo::AmountOfVirtualMemory(),
 223                                        base::SysInfo::NumberOfProcessors());
 224   isolate_ = v8::Isolate::New(params);
 225   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
 226 #if defined(OS_WIN)
 227   {
 228     void* code_range;
 229     size_t size;
 230     isolate_->GetCodeRange(&code_range, &size);
 231     Debug::CodeRangeCreatedCallback callback =
 232         DebugImpl::GetCodeRangeCreatedCallback();
 233     if (code_range && size && callback)
 234       callback(code_range, size);
 235   }
 236 #endif
 237 }
 238
 239 IsolateHolder::~IsolateHolder() {
 240   if (task_observer_.get())
 241     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 242 #if defined(OS_WIN)
 243   {
 244     void* code_range;
 245     size_t size;
 246     isolate_->GetCodeRange(&code_range, &size);
 247     Debug::CodeRangeDeletedCallback callback =
 248         DebugImpl::GetCodeRangeDeletedCallback();
 249     if (code_range && callback)
 250       callback(code_range);
 251   }
 252 #endif
 253   isolate_data_.reset();
 254   isolate_->Dispose();
 255   isolate_ = NULL;
 256 }
 257
 258 // static
 259 void IsolateHolder::Initialize(ScriptMode mode,
 260                                v8::ArrayBuffer::Allocator* allocator) {
 261   CHECK(allocator);
 262   static bool v8_is_initialized = false;
 263   if (v8_is_initialized)
 264     return;
 265   v8::V8::InitializePlatform(V8Platform::Get());
 266   v8::V8::SetArrayBufferAllocator(allocator);
 267   g_array_buffer_allocator = allocator;
 268   if (mode == gin::IsolateHolder::kStrictMode) {
 269     static const char use_strict[] = "--use_strict";
 270     v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
 271   }
 272   v8::V8::SetEntropySource(&GenerateEntropy);
 273 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 274   v8::StartupData natives;
 275   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
 276   natives.raw_size = static_cast<int>(g_mapped_natives->length());
 277   v8::V8::SetNativesDataBlob(&natives);
 278
 279   v8::StartupData snapshot;
 280   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 281   snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
 282   v8::V8::SetSnapshotDataBlob(&snapshot);
 283 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 284   v8::V8::Initialize();
 285   v8_is_initialized = true;
 286 }
 287
 288 void IsolateHolder::AddRunMicrotasksObserver() {
 289   DCHECK(!task_observer_.get());
 290   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
 291   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 292 }
 293
 294 void IsolateHolder::RemoveRunMicrotasksObserver() {
 295   DCHECK(task_observer_.get());
 296   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 297   task_observer_.reset();
 298 }
 299
 300 }  // namespace gin