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/metrics/field_trial.h"
  14 #include "base/rand_util.h"
  15 #include "base/strings/sys_string_conversions.h"
  16 #include "base/sys_info.h"
  17 #include "crypto/sha2.h"
  18 #include "gin/array_buffer.h"
  19 #include "gin/debug_impl.h"
  20 #include "gin/function_template.h"
  21 #include "gin/per_isolate_data.h"
  22 #include "gin/public/v8_platform.h"
  23 #include "gin/run_microtasks_observer.h"
  24
  25 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  26 #if defined(OS_MACOSX)
  27 #include "base/mac/foundation_util.h"
  28 #endif  // OS_MACOSX
  29 #include "base/path_service.h"
  30 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  31
  32 namespace gin {
  33
  34 namespace {
  35
  36 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  37
  38 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  39   base::RandBytes(buffer, amount);
  40   return true;
  41 }
  42
  43 base::MemoryMappedFile* g_mapped_natives = NULL;
  44 base::MemoryMappedFile* g_mapped_snapshot = NULL;
  45
  46 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  47 bool MapV8Files(base::FilePath* natives_path,
  48                 base::FilePath* snapshot_path,
  49                 int natives_fd = -1,
  50                 int snapshot_fd = -1,
  51                 base::MemoryMappedFile::Region natives_region =
  52                     base::MemoryMappedFile::Region::kWholeFile,
  53                 base::MemoryMappedFile::Region snapshot_region =
  54                     base::MemoryMappedFile::Region::kWholeFile) {
  55   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
  56
  57   g_mapped_natives = new base::MemoryMappedFile;
  58   if (!g_mapped_natives->IsValid()) {
  59 #if !defined(OS_WIN)
  60     if (natives_fd == -1
  61             ? !g_mapped_natives->Initialize(base::File(*natives_path, flags),
  62                                             natives_region)
  63             : !g_mapped_natives->Initialize(base::File(natives_fd),
  64                                             natives_region)) {
  65 #else
  66     if (!g_mapped_natives->Initialize(base::File(*natives_path, flags),
  67                                       natives_region)) {
  68 #endif  // !OS_WIN
  69       delete g_mapped_natives;
  70       g_mapped_natives = NULL;
  71       LOG(FATAL) << "Couldn't mmap v8 natives data file";
  72       return false;
  73     }
  74   }
  75
  76   g_mapped_snapshot = new base::MemoryMappedFile;
  77   if (!g_mapped_snapshot->IsValid()) {
  78 #if !defined(OS_WIN)
  79     if (snapshot_fd == -1
  80             ? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags),
  81                                              snapshot_region)
  82             : !g_mapped_snapshot->Initialize(base::File(snapshot_fd),
  83                                              snapshot_region)) {
  84 #else
  85     if (!g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags),
  86                                        snapshot_region)) {
  87 #endif  // !OS_WIN
  88       delete g_mapped_snapshot;
  89       g_mapped_snapshot = NULL;
  90       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
  91       return false;
  92     }
  93   }
  94
  95   return true;
  96 }
  97
  98 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
  99 bool VerifyV8SnapshotFile(base::MemoryMappedFile* snapshot_file,
 100                           const unsigned char* fingerprint) {
 101   unsigned char output[crypto::kSHA256Length];
 102   crypto::SHA256HashString(
 103       base::StringPiece(reinterpret_cast<const char*>(snapshot_file->data()),
 104                         snapshot_file->length()),
 105       output, sizeof(output));
 106   return !memcmp(fingerprint, output, sizeof(output));
 107 }
 108 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 109
 110 #if !defined(OS_MACOSX)
 111 const int v8_snapshot_dir =
 112 #if defined(OS_ANDROID)
 113     base::DIR_ANDROID_APP_DATA;
 114 #elif defined(OS_POSIX)
 115     base::DIR_EXE;
 116 #elif defined(OS_WIN)
 117     base::DIR_MODULE;
 118 #endif  // OS_ANDROID
 119 #endif  // !OS_MACOSX
 120
 121 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 122
 123 }  // namespace
 124
 125 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 126
 127 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
 128 // Defined in gen/gin/v8_snapshot_fingerprint.cc
 129 extern const unsigned char g_natives_fingerprint[];
 130 extern const unsigned char g_snapshot_fingerprint[];
 131 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 132
 133 const char IsolateHolder::kNativesFileName[] = "natives_blob.bin";
 134 const char IsolateHolder::kSnapshotFileName[] = "snapshot_blob.bin";
 135
 136 // static
 137 bool IsolateHolder::LoadV8Snapshot() {
 138   if (g_mapped_natives && g_mapped_snapshot)
 139     return true;
 140
 141 #if !defined(OS_MACOSX)
 142   base::FilePath data_path;
 143   PathService::Get(v8_snapshot_dir, &data_path);
 144   DCHECK(!data_path.empty());
 145
 146   base::FilePath natives_path = data_path.AppendASCII(kNativesFileName);
 147   base::FilePath snapshot_path = data_path.AppendASCII(kSnapshotFileName);
 148 #else  // !defined(OS_MACOSX)
 149   base::ScopedCFTypeRef<CFStringRef> natives_file_name(
 150       base::SysUTF8ToCFStringRef(kNativesFileName));
 151   base::FilePath natives_path = base::mac::PathForFrameworkBundleResource(
 152       natives_file_name);
 153   base::ScopedCFTypeRef<CFStringRef> snapshot_file_name(
 154       base::SysUTF8ToCFStringRef(kSnapshotFileName));
 155   base::FilePath snapshot_path = base::mac::PathForFrameworkBundleResource(
 156       snapshot_file_name);
 157   DCHECK(!natives_path.empty());
 158   DCHECK(!snapshot_path.empty());
 159 #endif  // !defined(OS_MACOSX)
 160
 161   if (!MapV8Files(&natives_path, &snapshot_path))
 162     return false;
 163
 164 #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
 165   return VerifyV8SnapshotFile(g_mapped_natives, g_natives_fingerprint) &&
 166          VerifyV8SnapshotFile(g_mapped_snapshot, g_snapshot_fingerprint);
 167 #else
 168   return true;
 169 #endif  // V8_VERIFY_EXTERNAL_STARTUP_DATA
 170 }
 171
 172 //static
 173 bool IsolateHolder::LoadV8SnapshotFd(int natives_fd,
 174                                int64 natives_offset,
 175                                int64 natives_size,
 176                                int snapshot_fd,
 177                                int64 snapshot_offset,
 178                                int64 snapshot_size) {
 179   if (g_mapped_natives && g_mapped_snapshot)
 180     return true;
 181
 182   base::MemoryMappedFile::Region natives_region =
 183       base::MemoryMappedFile::Region::kWholeFile;
 184   if (natives_size != 0 || natives_offset != 0) {
 185     natives_region =
 186         base::MemoryMappedFile::Region(natives_offset, natives_size);
 187   }
 188
 189   base::MemoryMappedFile::Region snapshot_region =
 190       base::MemoryMappedFile::Region::kWholeFile;
 191   if (natives_size != 0 || natives_offset != 0) {
 192     snapshot_region =
 193         base::MemoryMappedFile::Region(snapshot_offset, snapshot_size);
 194   }
 195
 196   return MapV8Files(
 197       NULL, NULL, natives_fd, snapshot_fd, natives_region, snapshot_region);
 198 }
 199 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 200
 201 //static
 202 void IsolateHolder::GetV8ExternalSnapshotData(const char** natives_data_out,
 203                                               int* natives_size_out,
 204                                               const char** snapshot_data_out,
 205                                               int* snapshot_size_out) {
 206   if (!g_mapped_natives || !g_mapped_snapshot) {
 207     *natives_data_out = *snapshot_data_out = NULL;
 208     *natives_size_out = *snapshot_size_out = 0;
 209     return;
 210   }
 211   *natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data());
 212   *snapshot_data_out = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 213   *natives_size_out = static_cast<int>(g_mapped_natives->length());
 214   *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
 215 }
 216
 217 IsolateHolder::IsolateHolder() {
 218   CHECK(g_array_buffer_allocator)
 219       << "You need to invoke gin::IsolateHolder::Initialize first";
 220   v8::Isolate::CreateParams params;
 221   params.entry_hook = DebugImpl::GetFunctionEntryHook();
 222   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
 223   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
 224                                        base::SysInfo::AmountOfVirtualMemory(),
 225                                        base::SysInfo::NumberOfProcessors());
 226   isolate_ = v8::Isolate::New(params);
 227   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
 228 #if defined(OS_WIN)
 229   {
 230     void* code_range;
 231     size_t size;
 232     isolate_->GetCodeRange(&code_range, &size);
 233     Debug::CodeRangeCreatedCallback callback =
 234         DebugImpl::GetCodeRangeCreatedCallback();
 235     if (code_range && size && callback)
 236       callback(code_range, size);
 237   }
 238 #endif
 239 }
 240
 241 IsolateHolder::~IsolateHolder() {
 242   if (task_observer_.get())
 243     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 244 #if defined(OS_WIN)
 245   {
 246     void* code_range;
 247     size_t size;
 248     isolate_->GetCodeRange(&code_range, &size);
 249     Debug::CodeRangeDeletedCallback callback =
 250         DebugImpl::GetCodeRangeDeletedCallback();
 251     if (code_range && callback)
 252       callback(code_range);
 253   }
 254 #endif
 255   isolate_data_.reset();
 256   isolate_->Dispose();
 257   isolate_ = NULL;
 258 }
 259
 260 // static
 261 void IsolateHolder::Initialize(ScriptMode mode,
 262                                v8::ArrayBuffer::Allocator* allocator) {
 263   CHECK(allocator);
 264   static bool v8_is_initialized = false;
 265   if (v8_is_initialized)
 266     return;
 267   v8::V8::InitializePlatform(V8Platform::Get());
 268   v8::V8::SetArrayBufferAllocator(allocator);
 269   g_array_buffer_allocator = allocator;
 270   if (mode == gin::IsolateHolder::kStrictMode) {
 271     static const char use_strict[] = "--use_strict";
 272     v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
 273   }
 274   if (base::FieldTrialList::FindFullName("V8VerifyHeap") == "Enabled") {
 275     static const char verify_heap[] = "--verify_heap";
 276     v8::V8::SetFlagsFromString(verify_heap, sizeof(verify_heap) - 1);
 277   }
 278   v8::V8::SetEntropySource(&GenerateEntropy);
 279 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 280   v8::StartupData natives;
 281   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
 282   natives.raw_size = static_cast<int>(g_mapped_natives->length());
 283   v8::V8::SetNativesDataBlob(&natives);
 284
 285   v8::StartupData snapshot;
 286   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 287   snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
 288   v8::V8::SetSnapshotDataBlob(&snapshot);
 289 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 290   v8::V8::Initialize();
 291   v8_is_initialized = true;
 292 }
 293
 294 void IsolateHolder::AddRunMicrotasksObserver() {
 295   DCHECK(!task_observer_.get());
 296   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
 297   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 298 }
 299
 300 void IsolateHolder::RemoveRunMicrotasksObserver() {
 301   DCHECK(task_observer_.get());
 302   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 303   task_observer_.reset();
 304 }
 305
 306 }  // namespace gin