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      1 // Copyright 2012 the V8 project 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 #ifndef V8_D8_H_
      6 #define V8_D8_H_
      7 
      8 #ifndef V8_SHARED
      9 #include "src/allocation.h"
     10 #include "src/base/platform/time.h"
     11 #include "src/hashmap.h"
     12 #include "src/list.h"
     13 #else
     14 #include "include/v8.h"
     15 #include "src/base/compiler-specific.h"
     16 #endif  // !V8_SHARED
     17 
     18 #include "src/base/once.h"
     19 
     20 
     21 namespace v8 {
     22 
     23 
     24 #ifndef V8_SHARED
     25 // A single counter in a counter collection.
     26 class Counter {
     27  public:
     28   static const int kMaxNameSize = 64;
     29   int32_t* Bind(const char* name, bool histogram);
     30   int32_t* ptr() { return &count_; }
     31   int32_t count() { return count_; }
     32   int32_t sample_total() { return sample_total_; }
     33   bool is_histogram() { return is_histogram_; }
     34   void AddSample(int32_t sample);
     35  private:
     36   int32_t count_;
     37   int32_t sample_total_;
     38   bool is_histogram_;
     39   uint8_t name_[kMaxNameSize];
     40 };
     41 
     42 
     43 // A set of counters and associated information.  An instance of this
     44 // class is stored directly in the memory-mapped counters file if
     45 // the --map-counters options is used
     46 class CounterCollection {
     47  public:
     48   CounterCollection();
     49   Counter* GetNextCounter();
     50  private:
     51   static const unsigned kMaxCounters = 512;
     52   uint32_t magic_number_;
     53   uint32_t max_counters_;
     54   uint32_t max_name_size_;
     55   uint32_t counters_in_use_;
     56   Counter counters_[kMaxCounters];
     57 };
     58 
     59 
     60 class CounterMap {
     61  public:
     62   CounterMap(): hash_map_(Match) { }
     63   Counter* Lookup(const char* name) {
     64     i::HashMap::Entry* answer =
     65         hash_map_.Lookup(const_cast<char*>(name), Hash(name));
     66     if (!answer) return NULL;
     67     return reinterpret_cast<Counter*>(answer->value);
     68   }
     69   void Set(const char* name, Counter* value) {
     70     i::HashMap::Entry* answer =
     71         hash_map_.LookupOrInsert(const_cast<char*>(name), Hash(name));
     72     DCHECK(answer != NULL);
     73     answer->value = value;
     74   }
     75   class Iterator {
     76    public:
     77     explicit Iterator(CounterMap* map)
     78         : map_(&map->hash_map_), entry_(map_->Start()) { }
     79     void Next() { entry_ = map_->Next(entry_); }
     80     bool More() { return entry_ != NULL; }
     81     const char* CurrentKey() { return static_cast<const char*>(entry_->key); }
     82     Counter* CurrentValue() { return static_cast<Counter*>(entry_->value); }
     83    private:
     84     i::HashMap* map_;
     85     i::HashMap::Entry* entry_;
     86   };
     87 
     88  private:
     89   static int Hash(const char* name);
     90   static bool Match(void* key1, void* key2);
     91   i::HashMap hash_map_;
     92 };
     93 #endif  // !V8_SHARED
     94 
     95 
     96 class SourceGroup {
     97  public:
     98   SourceGroup() :
     99 #ifndef V8_SHARED
    100       next_semaphore_(0),
    101       done_semaphore_(0),
    102       thread_(NULL),
    103 #endif  // !V8_SHARED
    104       argv_(NULL),
    105       begin_offset_(0),
    106       end_offset_(0) {}
    107 
    108   ~SourceGroup();
    109 
    110   void Begin(char** argv, int offset) {
    111     argv_ = const_cast<const char**>(argv);
    112     begin_offset_ = offset;
    113   }
    114 
    115   void End(int offset) { end_offset_ = offset; }
    116 
    117   void Execute(Isolate* isolate);
    118 
    119 #ifndef V8_SHARED
    120   void StartExecuteInThread();
    121   void WaitForThread();
    122   void JoinThread();
    123 
    124  private:
    125   class IsolateThread : public base::Thread {
    126    public:
    127     explicit IsolateThread(SourceGroup* group)
    128         : base::Thread(GetThreadOptions()), group_(group) {}
    129 
    130     virtual void Run() {
    131       group_->ExecuteInThread();
    132     }
    133 
    134    private:
    135     SourceGroup* group_;
    136   };
    137 
    138   static base::Thread::Options GetThreadOptions();
    139   void ExecuteInThread();
    140 
    141   base::Semaphore next_semaphore_;
    142   base::Semaphore done_semaphore_;
    143   base::Thread* thread_;
    144 #endif  // !V8_SHARED
    145 
    146   void ExitShell(int exit_code);
    147   Local<String> ReadFile(Isolate* isolate, const char* name);
    148 
    149   const char** argv_;
    150   int begin_offset_;
    151   int end_offset_;
    152 };
    153 
    154 #ifndef V8_SHARED
    155 enum SerializationTag {
    156   kSerializationTagUndefined,
    157   kSerializationTagNull,
    158   kSerializationTagTrue,
    159   kSerializationTagFalse,
    160   kSerializationTagNumber,
    161   kSerializationTagString,
    162   kSerializationTagArray,
    163   kSerializationTagObject,
    164   kSerializationTagArrayBuffer,
    165   kSerializationTagTransferredArrayBuffer,
    166   kSerializationTagTransferredSharedArrayBuffer,
    167 };
    168 
    169 
    170 class SerializationData {
    171  public:
    172   SerializationData() {}
    173   ~SerializationData();
    174 
    175   void WriteTag(SerializationTag tag);
    176   void WriteMemory(const void* p, int length);
    177   void WriteArrayBufferContents(const ArrayBuffer::Contents& contents);
    178   void WriteSharedArrayBufferContents(
    179       const SharedArrayBuffer::Contents& contents);
    180 
    181   template <typename T>
    182   void Write(const T& data) {
    183     WriteMemory(&data, sizeof(data));
    184   }
    185 
    186   SerializationTag ReadTag(int* offset) const;
    187   void ReadMemory(void* p, int length, int* offset) const;
    188   void ReadArrayBufferContents(ArrayBuffer::Contents* contents,
    189                                int* offset) const;
    190   void ReadSharedArrayBufferContents(SharedArrayBuffer::Contents* contents,
    191                                      int* offset) const;
    192 
    193   template <typename T>
    194   T Read(int* offset) const {
    195     T value;
    196     ReadMemory(&value, sizeof(value), offset);
    197     return value;
    198   }
    199 
    200  private:
    201   i::List<uint8_t> data_;
    202   i::List<ArrayBuffer::Contents> array_buffer_contents_;
    203   i::List<SharedArrayBuffer::Contents> shared_array_buffer_contents_;
    204 };
    205 
    206 
    207 class SerializationDataQueue {
    208  public:
    209   void Enqueue(SerializationData* data);
    210   bool Dequeue(SerializationData** data);
    211   bool IsEmpty();
    212   void Clear();
    213 
    214  private:
    215   base::Mutex mutex_;
    216   i::List<SerializationData*> data_;
    217 };
    218 
    219 
    220 class Worker {
    221  public:
    222   Worker();
    223   ~Worker();
    224 
    225   // Run the given script on this Worker. This function should only be called
    226   // once, and should only be called by the thread that created the Worker.
    227   void StartExecuteInThread(const char* script);
    228   // Post a message to the worker's incoming message queue. The worker will
    229   // take ownership of the SerializationData.
    230   // This function should only be called by the thread that created the Worker.
    231   void PostMessage(SerializationData* data);
    232   // Synchronously retrieve messages from the worker's outgoing message queue.
    233   // If there is no message in the queue, block until a message is available.
    234   // If there are no messages in the queue and the worker is no longer running,
    235   // return nullptr.
    236   // This function should only be called by the thread that created the Worker.
    237   SerializationData* GetMessage();
    238   // Terminate the worker's event loop. Messages from the worker that have been
    239   // queued can still be read via GetMessage().
    240   // This function can be called by any thread.
    241   void Terminate();
    242   // Terminate and join the thread.
    243   // This function can be called by any thread.
    244   void WaitForThread();
    245 
    246  private:
    247   class WorkerThread : public base::Thread {
    248    public:
    249     explicit WorkerThread(Worker* worker)
    250         : base::Thread(base::Thread::Options("WorkerThread")),
    251           worker_(worker) {}
    252 
    253     virtual void Run() { worker_->ExecuteInThread(); }
    254 
    255    private:
    256     Worker* worker_;
    257   };
    258 
    259   void ExecuteInThread();
    260   static void PostMessageOut(const v8::FunctionCallbackInfo<v8::Value>& args);
    261 
    262   base::Semaphore in_semaphore_;
    263   base::Semaphore out_semaphore_;
    264   SerializationDataQueue in_queue_;
    265   SerializationDataQueue out_queue_;
    266   base::Thread* thread_;
    267   char* script_;
    268   base::Atomic32 running_;
    269 };
    270 #endif  // !V8_SHARED
    271 
    272 
    273 class ShellOptions {
    274  public:
    275   ShellOptions()
    276       : script_executed(false),
    277         send_idle_notification(false),
    278         invoke_weak_callbacks(false),
    279         omit_quit(false),
    280         stress_opt(false),
    281         stress_deopt(false),
    282         stress_runs(1),
    283         interactive_shell(false),
    284         test_shell(false),
    285         dump_heap_constants(false),
    286         expected_to_throw(false),
    287         mock_arraybuffer_allocator(false),
    288         num_isolates(1),
    289         compile_options(v8::ScriptCompiler::kNoCompileOptions),
    290         isolate_sources(NULL),
    291         icu_data_file(NULL),
    292         natives_blob(NULL),
    293         snapshot_blob(NULL) {}
    294 
    295   ~ShellOptions() {
    296     delete[] isolate_sources;
    297   }
    298 
    299   bool use_interactive_shell() {
    300     return (interactive_shell || !script_executed) && !test_shell;
    301   }
    302 
    303   bool script_executed;
    304   bool send_idle_notification;
    305   bool invoke_weak_callbacks;
    306   bool omit_quit;
    307   bool stress_opt;
    308   bool stress_deopt;
    309   int stress_runs;
    310   bool interactive_shell;
    311   bool test_shell;
    312   bool dump_heap_constants;
    313   bool expected_to_throw;
    314   bool mock_arraybuffer_allocator;
    315   int num_isolates;
    316   v8::ScriptCompiler::CompileOptions compile_options;
    317   SourceGroup* isolate_sources;
    318   const char* icu_data_file;
    319   const char* natives_blob;
    320   const char* snapshot_blob;
    321 };
    322 
    323 #ifdef V8_SHARED
    324 class Shell {
    325 #else
    326 class Shell : public i::AllStatic {
    327 #endif  // V8_SHARED
    328 
    329  public:
    330   enum SourceType { SCRIPT, MODULE };
    331 
    332   static MaybeLocal<Script> CompileString(
    333       Isolate* isolate, Local<String> source, Local<Value> name,
    334       v8::ScriptCompiler::CompileOptions compile_options,
    335       SourceType source_type);
    336   static bool ExecuteString(Isolate* isolate, Local<String> source,
    337                             Local<Value> name, bool print_result,
    338                             bool report_exceptions,
    339                             SourceType source_type = SCRIPT);
    340   static const char* ToCString(const v8::String::Utf8Value& value);
    341   static void ReportException(Isolate* isolate, TryCatch* try_catch);
    342   static Local<String> ReadFile(Isolate* isolate, const char* name);
    343   static Local<Context> CreateEvaluationContext(Isolate* isolate);
    344   static int RunMain(Isolate* isolate, int argc, char* argv[], bool last_run);
    345   static int Main(int argc, char* argv[]);
    346   static void Exit(int exit_code);
    347   static void OnExit(Isolate* isolate);
    348   static void CollectGarbage(Isolate* isolate);
    349   static void EmptyMessageQueues(Isolate* isolate);
    350 
    351 #ifndef V8_SHARED
    352   // TODO(binji): stupid implementation for now. Is there an easy way to hash an
    353   // object for use in i::HashMap? By pointer?
    354   typedef i::List<Local<Object>> ObjectList;
    355   static bool SerializeValue(Isolate* isolate, Local<Value> value,
    356                              const ObjectList& to_transfer,
    357                              ObjectList* seen_objects,
    358                              SerializationData* out_data);
    359   static MaybeLocal<Value> DeserializeValue(Isolate* isolate,
    360                                             const SerializationData& data,
    361                                             int* offset);
    362   static void CleanupWorkers();
    363   static int* LookupCounter(const char* name);
    364   static void* CreateHistogram(const char* name,
    365                                int min,
    366                                int max,
    367                                size_t buckets);
    368   static void AddHistogramSample(void* histogram, int sample);
    369   static void MapCounters(v8::Isolate* isolate, const char* name);
    370 
    371   static void PerformanceNow(const v8::FunctionCallbackInfo<v8::Value>& args);
    372 #endif  // !V8_SHARED
    373 
    374   static void RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args);
    375   static void RealmOwner(const v8::FunctionCallbackInfo<v8::Value>& args);
    376   static void RealmGlobal(const v8::FunctionCallbackInfo<v8::Value>& args);
    377   static void RealmCreate(const v8::FunctionCallbackInfo<v8::Value>& args);
    378   static void RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args);
    379   static void RealmSwitch(const v8::FunctionCallbackInfo<v8::Value>& args);
    380   static void RealmEval(const v8::FunctionCallbackInfo<v8::Value>& args);
    381   static void RealmSharedGet(Local<String> property,
    382                              const  PropertyCallbackInfo<Value>& info);
    383   static void RealmSharedSet(Local<String> property,
    384                              Local<Value> value,
    385                              const  PropertyCallbackInfo<void>& info);
    386 
    387   static void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
    388   static void Write(const v8::FunctionCallbackInfo<v8::Value>& args);
    389   static void QuitOnce(v8::FunctionCallbackInfo<v8::Value>* args);
    390   static void Quit(const v8::FunctionCallbackInfo<v8::Value>& args);
    391   static void Version(const v8::FunctionCallbackInfo<v8::Value>& args);
    392   static void Read(const v8::FunctionCallbackInfo<v8::Value>& args);
    393   static void ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
    394   static Local<String> ReadFromStdin(Isolate* isolate);
    395   static void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
    396     args.GetReturnValue().Set(ReadFromStdin(args.GetIsolate()));
    397   }
    398   static void Load(const v8::FunctionCallbackInfo<v8::Value>& args);
    399   static void WorkerNew(const v8::FunctionCallbackInfo<v8::Value>& args);
    400   static void WorkerPostMessage(
    401       const v8::FunctionCallbackInfo<v8::Value>& args);
    402   static void WorkerGetMessage(const v8::FunctionCallbackInfo<v8::Value>& args);
    403   static void WorkerTerminate(const v8::FunctionCallbackInfo<v8::Value>& args);
    404   // The OS object on the global object contains methods for performing
    405   // operating system calls:
    406   //
    407   // os.system("program_name", ["arg1", "arg2", ...], timeout1, timeout2) will
    408   // run the command, passing the arguments to the program.  The standard output
    409   // of the program will be picked up and returned as a multiline string.  If
    410   // timeout1 is present then it should be a number.  -1 indicates no timeout
    411   // and a positive number is used as a timeout in milliseconds that limits the
    412   // time spent waiting between receiving output characters from the program.
    413   // timeout2, if present, should be a number indicating the limit in
    414   // milliseconds on the total running time of the program.  Exceptions are
    415   // thrown on timeouts or other errors or if the exit status of the program
    416   // indicates an error.
    417   //
    418   // os.chdir(dir) changes directory to the given directory.  Throws an
    419   // exception/ on error.
    420   //
    421   // os.setenv(variable, value) sets an environment variable.  Repeated calls to
    422   // this method leak memory due to the API of setenv in the standard C library.
    423   //
    424   // os.umask(alue) calls the umask system call and returns the old umask.
    425   //
    426   // os.mkdirp(name, mask) creates a directory.  The mask (if present) is anded
    427   // with the current umask.  Intermediate directories are created if necessary.
    428   // An exception is not thrown if the directory already exists.  Analogous to
    429   // the "mkdir -p" command.
    430   static void System(const v8::FunctionCallbackInfo<v8::Value>& args);
    431   static void ChangeDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
    432   static void SetEnvironment(const v8::FunctionCallbackInfo<v8::Value>& args);
    433   static void UnsetEnvironment(const v8::FunctionCallbackInfo<v8::Value>& args);
    434   static void SetUMask(const v8::FunctionCallbackInfo<v8::Value>& args);
    435   static void MakeDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
    436   static void RemoveDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
    437 
    438   static void AddOSMethods(v8::Isolate* isolate,
    439                            Local<ObjectTemplate> os_template);
    440 
    441   static const char* kPrompt;
    442   static ShellOptions options;
    443   static ArrayBuffer::Allocator* array_buffer_allocator;
    444 
    445  private:
    446   static Global<Context> evaluation_context_;
    447   static base::OnceType quit_once_;
    448 #ifndef V8_SHARED
    449   static Global<Context> utility_context_;
    450   static CounterMap* counter_map_;
    451   // We statically allocate a set of local counters to be used if we
    452   // don't want to store the stats in a memory-mapped file
    453   static CounterCollection local_counters_;
    454   static CounterCollection* counters_;
    455   static base::OS::MemoryMappedFile* counters_file_;
    456   static base::LazyMutex context_mutex_;
    457   static const base::TimeTicks kInitialTicks;
    458 
    459   static base::LazyMutex workers_mutex_;
    460   static bool allow_new_workers_;
    461   static i::List<Worker*> workers_;
    462   static i::List<SharedArrayBuffer::Contents> externalized_shared_contents_;
    463 
    464   static Counter* GetCounter(const char* name, bool is_histogram);
    465   static void InstallUtilityScript(Isolate* isolate);
    466 #endif  // !V8_SHARED
    467   static void Initialize(Isolate* isolate);
    468   static void RunShell(Isolate* isolate);
    469   static bool SetOptions(int argc, char* argv[]);
    470   static Local<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
    471 };
    472 
    473 
    474 }  // namespace v8
    475 
    476 
    477 #endif  // V8_D8_H_
    478