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 #ifdef OS_MACOSX
  24 #include "base/mac/foundation_util.h"
  25 #endif  // OS_MACOSX
  26 #include "base/path_service.h"
  27 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  28
  29 namespace gin {
  30
  31 namespace {
  32
  33 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
  34
  35 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
  36   base::RandBytes(buffer, amount);
  37   return true;
  38 }
  39
  40 base::MemoryMappedFile* g_mapped_natives = NULL;
  41 base::MemoryMappedFile* g_mapped_snapshot = NULL;
  42
  43 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  44 bool MapV8Files(base::FilePath* natives_path, base::FilePath* snapshot_path,
  45                 int natives_fd = -1, int snapshot_fd = -1) {
  46   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
  47
  48   g_mapped_natives = new base::MemoryMappedFile;
  49   if (!g_mapped_natives->IsValid()) {
  50     if (natives_fd == -1
  51         ? !g_mapped_natives->Initialize(base::File(*natives_path, flags))
  52         : !g_mapped_natives->Initialize(base::File(natives_fd))) {
  53       delete g_mapped_natives;
  54       g_mapped_natives = NULL;
  55       LOG(FATAL) << "Couldn't mmap v8 natives data file";
  56       return false;
  57     }
  58   }
  59
  60   g_mapped_snapshot = new base::MemoryMappedFile;
  61   if (!g_mapped_snapshot->IsValid()) {
  62     if (snapshot_fd == -1
  63         ? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags))
  64         : !g_mapped_snapshot->Initialize(base::File(snapshot_fd))) {
  65       delete g_mapped_snapshot;
  66       g_mapped_snapshot = NULL;
  67       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
  68       return false;
  69     }
  70   }
  71
  72   return true;
  73 }
  74
  75 #if !defined(OS_MACOSX)
  76 const int v8_snapshot_dir =
  77 #if defined(OS_ANDROID)
  78     base::DIR_ANDROID_APP_DATA;
  79 #elif defined(OS_POSIX)
  80     base::DIR_EXE;
  81 #endif  // defined(OS_ANDROID)
  82 #endif  // !defined(OS_MACOSX)
  83
  84 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  85
  86 }  // namespace
  87
  88
  89 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
  90 // static
  91 bool IsolateHolder::LoadV8Snapshot() {
  92   if (g_mapped_natives && g_mapped_snapshot)
  93     return true;
  94
  95 #if !defined(OS_MACOSX)
  96   base::FilePath data_path;
  97   PathService::Get(v8_snapshot_dir, &data_path);
  98   DCHECK(!data_path.empty());
  99
 100   base::FilePath natives_path = data_path.AppendASCII("natives_blob.bin");
 101   base::FilePath snapshot_path = data_path.AppendASCII("snapshot_blob.bin");
 102 #else  // !defined(OS_MACOSX)
 103   base::FilePath natives_path = base::mac::PathForFrameworkBundleResource(
 104       CFSTR("natives_blob.bin"));
 105   base::FilePath snapshot_path = base::mac::PathForFrameworkBundleResource(
 106       CFSTR("snapshot_blob.bin"));
 107   DCHECK(!natives_path.empty());
 108   DCHECK(!snapshot_path.empty());
 109 #endif  // !defined(OS_MACOSX)
 110
 111   return MapV8Files(&natives_path, &snapshot_path);
 112 }
 113
 114 //static
 115 bool IsolateHolder::LoadV8SnapshotFD(int natives_fd, int snapshot_fd) {
 116   if (g_mapped_natives && g_mapped_snapshot)
 117     return true;
 118
 119   return MapV8Files(NULL, NULL, natives_fd, snapshot_fd);
 120 }
 121 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 122
 123 //static
 124 void IsolateHolder::GetV8ExternalSnapshotData(const char** natives_data_out,
 125                                               int* natives_size_out,
 126                                               const char** snapshot_data_out,
 127                                               int* snapshot_size_out) {
 128   if (!g_mapped_natives || !g_mapped_snapshot) {
 129     *natives_data_out = *snapshot_data_out = NULL;
 130     *natives_size_out = *snapshot_size_out = 0;
 131     return;
 132   }
 133   *natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data());
 134   *snapshot_data_out = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 135   *natives_size_out = static_cast<int>(g_mapped_natives->length());
 136   *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
 137 }
 138
 139 IsolateHolder::IsolateHolder() {
 140   CHECK(g_array_buffer_allocator)
 141       << "You need to invoke gin::IsolateHolder::Initialize first";
 142   v8::Isolate::CreateParams params;
 143   params.entry_hook = DebugImpl::GetFunctionEntryHook();
 144   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
 145   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
 146                                        base::SysInfo::AmountOfVirtualMemory(),
 147                                        base::SysInfo::NumberOfProcessors());
 148   isolate_ = v8::Isolate::New(params);
 149   isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
 150 #if defined(OS_WIN)
 151   {
 152     void* code_range;
 153     size_t size;
 154     isolate_->GetCodeRange(&code_range, &size);
 155     Debug::CodeRangeCreatedCallback callback =
 156         DebugImpl::GetCodeRangeCreatedCallback();
 157     if (code_range && size && callback)
 158       callback(code_range, size);
 159   }
 160 #endif
 161 }
 162
 163 IsolateHolder::~IsolateHolder() {
 164   if (task_observer_.get())
 165     base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 166 #if defined(OS_WIN)
 167   {
 168     void* code_range;
 169     size_t size;
 170     isolate_->GetCodeRange(&code_range, &size);
 171     Debug::CodeRangeDeletedCallback callback =
 172         DebugImpl::GetCodeRangeDeletedCallback();
 173     if (code_range && callback)
 174       callback(code_range);
 175   }
 176 #endif
 177   isolate_data_.reset();
 178   isolate_->Dispose();
 179 }
 180
 181 // static
 182 void IsolateHolder::Initialize(ScriptMode mode,
 183                                v8::ArrayBuffer::Allocator* allocator) {
 184   CHECK(allocator);
 185   static bool v8_is_initialized = false;
 186   if (v8_is_initialized)
 187     return;
 188   v8::V8::InitializePlatform(V8Platform::Get());
 189   v8::V8::SetArrayBufferAllocator(allocator);
 190   g_array_buffer_allocator = allocator;
 191   if (mode == gin::IsolateHolder::kStrictMode) {
 192     static const char v8_flags[] = "--use_strict";
 193     v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
 194   }
 195   v8::V8::SetEntropySource(&GenerateEntropy);
 196 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 197   v8::StartupData natives;
 198   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
 199   natives.raw_size = static_cast<int>(g_mapped_natives->length());
 200   v8::V8::SetNativesDataBlob(&natives);
 201
 202   v8::StartupData snapshot;
 203   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
 204   snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
 205   v8::V8::SetSnapshotDataBlob(&snapshot);
 206 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 207   v8::V8::Initialize();
 208   v8_is_initialized = true;
 209 }
 210
 211 void IsolateHolder::AddRunMicrotasksObserver() {
 212   DCHECK(!task_observer_.get());
 213   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
 214   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 215 }
 216
 217 void IsolateHolder::RemoveRunMicrotasksObserver() {
 218   DCHECK(task_observer_.get());
 219   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
 220   task_observer_.reset();
 221 }
 222
 223 }  // namespace gin