Home | History | Annotate | Download | only in src 
      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 
      6 // Defined when linking against shared lib on Windows.
      7 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
      8 #define V8_SHARED
      9 #endif
     10 
     11 #ifdef COMPRESS_STARTUP_DATA_BZ2
     12 #include <bzlib.h>
     13 #endif
     14 
     15 #include <errno.h>
     16 #include <stdlib.h>
     17 #include <string.h>
     18 #include <sys/stat.h>
     19 
     20 #ifdef V8_SHARED
     21 #include <assert.h>
     22 #endif  // V8_SHARED
     23 
     24 #ifndef V8_SHARED
     25 #include <algorithm>
     26 #endif  // !V8_SHARED
     27 
     28 #ifdef V8_SHARED
     29 #include "include/v8-testing.h"
     30 #endif  // V8_SHARED
     31 
     32 #if !defined(V8_SHARED) && defined(ENABLE_GDB_JIT_INTERFACE)
     33 #include "src/gdb-jit.h"
     34 #endif
     35 
     36 #ifdef ENABLE_VTUNE_JIT_INTERFACE
     37 #include "src/third_party/vtune/v8-vtune.h"
     38 #endif
     39 
     40 #include "src/d8.h"
     41 
     42 #include "include/libplatform/libplatform.h"
     43 #ifndef V8_SHARED
     44 #include "src/api.h"
     45 #include "src/base/cpu.h"
     46 #include "src/base/logging.h"
     47 #include "src/base/platform/platform.h"
     48 #include "src/base/sys-info.h"
     49 #include "src/d8-debug.h"
     50 #include "src/debug.h"
     51 #include "src/natives.h"
     52 #include "src/v8.h"
     53 #endif  // !V8_SHARED
     54 
     55 #if !defined(_WIN32) && !defined(_WIN64)
     56 #include <unistd.h>  // NOLINT
     57 #else
     58 #include <windows.h>  // NOLINT
     59 #if defined(_MSC_VER)
     60 #include <crtdbg.h>  // NOLINT
     61 #endif               // defined(_MSC_VER)
     62 #endif               // !defined(_WIN32) && !defined(_WIN64)
     63 
     64 #ifndef DCHECK
     65 #define DCHECK(condition) assert(condition)
     66 #endif
     67 
     68 namespace v8 {
     69 
     70 
     71 static Handle<Value> Throw(Isolate* isolate, const char* message) {
     72   return isolate->ThrowException(String::NewFromUtf8(isolate, message));
     73 }
     74 
     75 
     76 
     77 class PerIsolateData {
     78  public:
     79   explicit PerIsolateData(Isolate* isolate) : isolate_(isolate), realms_(NULL) {
     80     HandleScope scope(isolate);
     81     isolate->SetData(0, this);
     82   }
     83 
     84   ~PerIsolateData() {
     85     isolate_->SetData(0, NULL);  // Not really needed, just to be sure...
     86   }
     87 
     88   inline static PerIsolateData* Get(Isolate* isolate) {
     89     return reinterpret_cast<PerIsolateData*>(isolate->GetData(0));
     90   }
     91 
     92   class RealmScope {
     93    public:
     94     explicit RealmScope(PerIsolateData* data);
     95     ~RealmScope();
     96    private:
     97     PerIsolateData* data_;
     98   };
     99 
    100  private:
    101   friend class Shell;
    102   friend class RealmScope;
    103   Isolate* isolate_;
    104   int realm_count_;
    105   int realm_current_;
    106   int realm_switch_;
    107   Persistent<Context>* realms_;
    108   Persistent<Value> realm_shared_;
    109 
    110   int RealmIndexOrThrow(const v8::FunctionCallbackInfo<v8::Value>& args,
    111                         int arg_offset);
    112   int RealmFind(Handle<Context> context);
    113 };
    114 
    115 
    116 LineEditor *LineEditor::current_ = NULL;
    117 
    118 
    119 LineEditor::LineEditor(Type type, const char* name)
    120     : type_(type), name_(name) {
    121   if (current_ == NULL || current_->type_ < type) current_ = this;
    122 }
    123 
    124 
    125 class DumbLineEditor: public LineEditor {
    126  public:
    127   explicit DumbLineEditor(Isolate* isolate)
    128       : LineEditor(LineEditor::DUMB, "dumb"), isolate_(isolate) { }
    129   virtual Handle<String> Prompt(const char* prompt);
    130  private:
    131   Isolate* isolate_;
    132 };
    133 
    134 
    135 Handle<String> DumbLineEditor::Prompt(const char* prompt) {
    136   printf("%s", prompt);
    137 #if defined(__native_client__)
    138   // Native Client libc is used to being embedded in Chrome and
    139   // has trouble recognizing when to flush.
    140   fflush(stdout);
    141 #endif
    142   return Shell::ReadFromStdin(isolate_);
    143 }
    144 
    145 
    146 #ifndef V8_SHARED
    147 CounterMap* Shell::counter_map_;
    148 base::OS::MemoryMappedFile* Shell::counters_file_ = NULL;
    149 CounterCollection Shell::local_counters_;
    150 CounterCollection* Shell::counters_ = &local_counters_;
    151 base::Mutex Shell::context_mutex_;
    152 const base::TimeTicks Shell::kInitialTicks =
    153     base::TimeTicks::HighResolutionNow();
    154 Persistent<Context> Shell::utility_context_;
    155 #endif  // !V8_SHARED
    156 
    157 Persistent<Context> Shell::evaluation_context_;
    158 ShellOptions Shell::options;
    159 const char* Shell::kPrompt = "d8> ";
    160 
    161 
    162 #ifndef V8_SHARED
    163 const int MB = 1024 * 1024;
    164 
    165 bool CounterMap::Match(void* key1, void* key2) {
    166   const char* name1 = reinterpret_cast<const char*>(key1);
    167   const char* name2 = reinterpret_cast<const char*>(key2);
    168   return strcmp(name1, name2) == 0;
    169 }
    170 #endif  // !V8_SHARED
    171 
    172 
    173 // Converts a V8 value to a C string.
    174 const char* Shell::ToCString(const v8::String::Utf8Value& value) {
    175   return *value ? *value : "<string conversion failed>";
    176 }
    177 
    178 
    179 // Compile a string within the current v8 context.
    180 Local<UnboundScript> Shell::CompileString(
    181     Isolate* isolate, Local<String> source, Local<Value> name,
    182     v8::ScriptCompiler::CompileOptions compile_options) {
    183   ScriptOrigin origin(name);
    184   ScriptCompiler::Source script_source(source, origin);
    185   Local<UnboundScript> script =
    186       ScriptCompiler::CompileUnbound(isolate, &script_source, compile_options);
    187 
    188   // Was caching requested & successful? Then compile again, now with cache.
    189   if (script_source.GetCachedData()) {
    190     if (compile_options == ScriptCompiler::kProduceCodeCache) {
    191       compile_options = ScriptCompiler::kConsumeCodeCache;
    192     } else if (compile_options == ScriptCompiler::kProduceParserCache) {
    193       compile_options = ScriptCompiler::kConsumeParserCache;
    194     } else {
    195       DCHECK(false);  // A new compile option?
    196     }
    197     ScriptCompiler::Source cached_source(
    198         source, origin, new v8::ScriptCompiler::CachedData(
    199                             script_source.GetCachedData()->data,
    200                             script_source.GetCachedData()->length,
    201                             v8::ScriptCompiler::CachedData::BufferNotOwned));
    202     script = ScriptCompiler::CompileUnbound(isolate, &cached_source,
    203                                             compile_options);
    204   }
    205   return script;
    206 }
    207 
    208 
    209 // Executes a string within the current v8 context.
    210 bool Shell::ExecuteString(Isolate* isolate,
    211                           Handle<String> source,
    212                           Handle<Value> name,
    213                           bool print_result,
    214                           bool report_exceptions) {
    215 #ifndef V8_SHARED
    216   bool FLAG_debugger = i::FLAG_debugger;
    217 #else
    218   bool FLAG_debugger = false;
    219 #endif  // !V8_SHARED
    220   HandleScope handle_scope(isolate);
    221   TryCatch try_catch;
    222   options.script_executed = true;
    223   if (FLAG_debugger) {
    224     // When debugging make exceptions appear to be uncaught.
    225     try_catch.SetVerbose(true);
    226   }
    227 
    228   Handle<UnboundScript> script =
    229       Shell::CompileString(isolate, source, name, options.compile_options);
    230   if (script.IsEmpty()) {
    231     // Print errors that happened during compilation.
    232     if (report_exceptions && !FLAG_debugger)
    233       ReportException(isolate, &try_catch);
    234     return false;
    235   } else {
    236     PerIsolateData* data = PerIsolateData::Get(isolate);
    237     Local<Context> realm =
    238         Local<Context>::New(isolate, data->realms_[data->realm_current_]);
    239     realm->Enter();
    240     Handle<Value> result = script->BindToCurrentContext()->Run();
    241     realm->Exit();
    242     data->realm_current_ = data->realm_switch_;
    243     if (result.IsEmpty()) {
    244       DCHECK(try_catch.HasCaught());
    245       // Print errors that happened during execution.
    246       if (report_exceptions && !FLAG_debugger)
    247         ReportException(isolate, &try_catch);
    248       return false;
    249     } else {
    250       DCHECK(!try_catch.HasCaught());
    251       if (print_result) {
    252 #if !defined(V8_SHARED)
    253         if (options.test_shell) {
    254 #endif
    255           if (!result->IsUndefined()) {
    256             // If all went well and the result wasn't undefined then print
    257             // the returned value.
    258             v8::String::Utf8Value str(result);
    259             fwrite(*str, sizeof(**str), str.length(), stdout);
    260             printf("\n");
    261           }
    262 #if !defined(V8_SHARED)
    263         } else {
    264           v8::TryCatch try_catch;
    265           v8::Local<v8::Context> context =
    266               v8::Local<v8::Context>::New(isolate, utility_context_);
    267           v8::Context::Scope context_scope(context);
    268           Handle<Object> global = context->Global();
    269           Handle<Value> fun =
    270               global->Get(String::NewFromUtf8(isolate, "Stringify"));
    271           Handle<Value> argv[1] = { result };
    272           Handle<Value> s = Handle<Function>::Cast(fun)->Call(global, 1, argv);
    273           if (try_catch.HasCaught()) return true;
    274           v8::String::Utf8Value str(s);
    275           fwrite(*str, sizeof(**str), str.length(), stdout);
    276           printf("\n");
    277         }
    278 #endif
    279       }
    280       return true;
    281     }
    282   }
    283 }
    284 
    285 
    286 PerIsolateData::RealmScope::RealmScope(PerIsolateData* data) : data_(data) {
    287   data_->realm_count_ = 1;
    288   data_->realm_current_ = 0;
    289   data_->realm_switch_ = 0;
    290   data_->realms_ = new Persistent<Context>[1];
    291   data_->realms_[0].Reset(data_->isolate_,
    292                           data_->isolate_->GetEnteredContext());
    293 }
    294 
    295 
    296 PerIsolateData::RealmScope::~RealmScope() {
    297   // Drop realms to avoid keeping them alive.
    298   for (int i = 0; i < data_->realm_count_; ++i)
    299     data_->realms_[i].Reset();
    300   delete[] data_->realms_;
    301   if (!data_->realm_shared_.IsEmpty())
    302     data_->realm_shared_.Reset();
    303 }
    304 
    305 
    306 int PerIsolateData::RealmFind(Handle<Context> context) {
    307   for (int i = 0; i < realm_count_; ++i) {
    308     if (realms_[i] == context) return i;
    309   }
    310   return -1;
    311 }
    312 
    313 
    314 int PerIsolateData::RealmIndexOrThrow(
    315     const v8::FunctionCallbackInfo<v8::Value>& args,
    316     int arg_offset) {
    317   if (args.Length() < arg_offset || !args[arg_offset]->IsNumber()) {
    318     Throw(args.GetIsolate(), "Invalid argument");
    319     return -1;
    320   }
    321   int index = args[arg_offset]->Int32Value();
    322   if (index < 0 ||
    323       index >= realm_count_ ||
    324       realms_[index].IsEmpty()) {
    325     Throw(args.GetIsolate(), "Invalid realm index");
    326     return -1;
    327   }
    328   return index;
    329 }
    330 
    331 
    332 #ifndef V8_SHARED
    333 // performance.now() returns a time stamp as double, measured in milliseconds.
    334 // When FLAG_verify_predictable mode is enabled it returns current value
    335 // of Heap::allocations_count().
    336 void Shell::PerformanceNow(const v8::FunctionCallbackInfo<v8::Value>& args) {
    337   if (i::FLAG_verify_predictable) {
    338     Isolate* v8_isolate = args.GetIsolate();
    339     i::Heap* heap = reinterpret_cast<i::Isolate*>(v8_isolate)->heap();
    340     args.GetReturnValue().Set(heap->synthetic_time());
    341   } else {
    342     base::TimeDelta delta =
    343         base::TimeTicks::HighResolutionNow() - kInitialTicks;
    344     args.GetReturnValue().Set(delta.InMillisecondsF());
    345   }
    346 }
    347 #endif  // !V8_SHARED
    348 
    349 
    350 // Realm.current() returns the index of the currently active realm.
    351 void Shell::RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args) {
    352   Isolate* isolate = args.GetIsolate();
    353   PerIsolateData* data = PerIsolateData::Get(isolate);
    354   int index = data->RealmFind(isolate->GetEnteredContext());
    355   if (index == -1) return;
    356   args.GetReturnValue().Set(index);
    357 }
    358 
    359 
    360 // Realm.owner(o) returns the index of the realm that created o.
    361 void Shell::RealmOwner(const v8::FunctionCallbackInfo<v8::Value>& args) {
    362   Isolate* isolate = args.GetIsolate();
    363   PerIsolateData* data = PerIsolateData::Get(isolate);
    364   if (args.Length() < 1 || !args[0]->IsObject()) {
    365     Throw(args.GetIsolate(), "Invalid argument");
    366     return;
    367   }
    368   int index = data->RealmFind(args[0]->ToObject()->CreationContext());
    369   if (index == -1) return;
    370   args.GetReturnValue().Set(index);
    371 }
    372 
    373 
    374 // Realm.global(i) returns the global object of realm i.
    375 // (Note that properties of global objects cannot be read/written cross-realm.)
    376 void Shell::RealmGlobal(const v8::FunctionCallbackInfo<v8::Value>& args) {
    377   PerIsolateData* data = PerIsolateData::Get(args.GetIsolate());
    378   int index = data->RealmIndexOrThrow(args, 0);
    379   if (index == -1) return;
    380   args.GetReturnValue().Set(
    381       Local<Context>::New(args.GetIsolate(), data->realms_[index])->Global());
    382 }
    383 
    384 
    385 // Realm.create() creates a new realm and returns its index.
    386 void Shell::RealmCreate(const v8::FunctionCallbackInfo<v8::Value>& args) {
    387   Isolate* isolate = args.GetIsolate();
    388   PerIsolateData* data = PerIsolateData::Get(isolate);
    389   Persistent<Context>* old_realms = data->realms_;
    390   int index = data->realm_count_;
    391   data->realms_ = new Persistent<Context>[++data->realm_count_];
    392   for (int i = 0; i < index; ++i) {
    393     data->realms_[i].Reset(isolate, old_realms[i]);
    394   }
    395   delete[] old_realms;
    396   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    397   data->realms_[index].Reset(
    398       isolate, Context::New(isolate, NULL, global_template));
    399   args.GetReturnValue().Set(index);
    400 }
    401 
    402 
    403 // Realm.dispose(i) disposes the reference to the realm i.
    404 void Shell::RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
    405   Isolate* isolate = args.GetIsolate();
    406   PerIsolateData* data = PerIsolateData::Get(isolate);
    407   int index = data->RealmIndexOrThrow(args, 0);
    408   if (index == -1) return;
    409   if (index == 0 ||
    410       index == data->realm_current_ || index == data->realm_switch_) {
    411     Throw(args.GetIsolate(), "Invalid realm index");
    412     return;
    413   }
    414   data->realms_[index].Reset();
    415 }
    416 
    417 
    418 // Realm.switch(i) switches to the realm i for consecutive interactive inputs.
    419 void Shell::RealmSwitch(const v8::FunctionCallbackInfo<v8::Value>& args) {
    420   Isolate* isolate = args.GetIsolate();
    421   PerIsolateData* data = PerIsolateData::Get(isolate);
    422   int index = data->RealmIndexOrThrow(args, 0);
    423   if (index == -1) return;
    424   data->realm_switch_ = index;
    425 }
    426 
    427 
    428 // Realm.eval(i, s) evaluates s in realm i and returns the result.
    429 void Shell::RealmEval(const v8::FunctionCallbackInfo<v8::Value>& args) {
    430   Isolate* isolate = args.GetIsolate();
    431   PerIsolateData* data = PerIsolateData::Get(isolate);
    432   int index = data->RealmIndexOrThrow(args, 0);
    433   if (index == -1) return;
    434   if (args.Length() < 2 || !args[1]->IsString()) {
    435     Throw(args.GetIsolate(), "Invalid argument");
    436     return;
    437   }
    438   ScriptCompiler::Source script_source(args[1]->ToString());
    439   Handle<UnboundScript> script = ScriptCompiler::CompileUnbound(
    440       isolate, &script_source);
    441   if (script.IsEmpty()) return;
    442   Local<Context> realm = Local<Context>::New(isolate, data->realms_[index]);
    443   realm->Enter();
    444   Handle<Value> result = script->BindToCurrentContext()->Run();
    445   realm->Exit();
    446   args.GetReturnValue().Set(result);
    447 }
    448 
    449 
    450 // Realm.shared is an accessor for a single shared value across realms.
    451 void Shell::RealmSharedGet(Local<String> property,
    452                            const PropertyCallbackInfo<Value>& info) {
    453   Isolate* isolate = info.GetIsolate();
    454   PerIsolateData* data = PerIsolateData::Get(isolate);
    455   if (data->realm_shared_.IsEmpty()) return;
    456   info.GetReturnValue().Set(data->realm_shared_);
    457 }
    458 
    459 void Shell::RealmSharedSet(Local<String> property,
    460                            Local<Value> value,
    461                            const PropertyCallbackInfo<void>& info) {
    462   Isolate* isolate = info.GetIsolate();
    463   PerIsolateData* data = PerIsolateData::Get(isolate);
    464   data->realm_shared_.Reset(isolate, value);
    465 }
    466 
    467 
    468 void Shell::Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
    469   Write(args);
    470   printf("\n");
    471   fflush(stdout);
    472 }
    473 
    474 
    475 void Shell::Write(const v8::FunctionCallbackInfo<v8::Value>& args) {
    476   for (int i = 0; i < args.Length(); i++) {
    477     HandleScope handle_scope(args.GetIsolate());
    478     if (i != 0) {
    479       printf(" ");
    480     }
    481 
    482     // Explicitly catch potential exceptions in toString().
    483     v8::TryCatch try_catch;
    484     Handle<String> str_obj = args[i]->ToString();
    485     if (try_catch.HasCaught()) {
    486       try_catch.ReThrow();
    487       return;
    488     }
    489 
    490     v8::String::Utf8Value str(str_obj);
    491     int n = static_cast<int>(fwrite(*str, sizeof(**str), str.length(), stdout));
    492     if (n != str.length()) {
    493       printf("Error in fwrite\n");
    494       Exit(1);
    495     }
    496   }
    497 }
    498 
    499 
    500 void Shell::Read(const v8::FunctionCallbackInfo<v8::Value>& args) {
    501   String::Utf8Value file(args[0]);
    502   if (*file == NULL) {
    503     Throw(args.GetIsolate(), "Error loading file");
    504     return;
    505   }
    506   Handle<String> source = ReadFile(args.GetIsolate(), *file);
    507   if (source.IsEmpty()) {
    508     Throw(args.GetIsolate(), "Error loading file");
    509     return;
    510   }
    511   args.GetReturnValue().Set(source);
    512 }
    513 
    514 
    515 Handle<String> Shell::ReadFromStdin(Isolate* isolate) {
    516   static const int kBufferSize = 256;
    517   char buffer[kBufferSize];
    518   Handle<String> accumulator = String::NewFromUtf8(isolate, "");
    519   int length;
    520   while (true) {
    521     // Continue reading if the line ends with an escape '\\' or the line has
    522     // not been fully read into the buffer yet (does not end with '\n').
    523     // If fgets gets an error, just give up.
    524     char* input = NULL;
    525     input = fgets(buffer, kBufferSize, stdin);
    526     if (input == NULL) return Handle<String>();
    527     length = static_cast<int>(strlen(buffer));
    528     if (length == 0) {
    529       return accumulator;
    530     } else if (buffer[length-1] != '\n') {
    531       accumulator = String::Concat(
    532           accumulator,
    533           String::NewFromUtf8(isolate, buffer, String::kNormalString, length));
    534     } else if (length > 1 && buffer[length-2] == '\\') {
    535       buffer[length-2] = '\n';
    536       accumulator = String::Concat(
    537           accumulator, String::NewFromUtf8(isolate, buffer,
    538                                            String::kNormalString, length - 1));
    539     } else {
    540       return String::Concat(
    541           accumulator, String::NewFromUtf8(isolate, buffer,
    542                                            String::kNormalString, length - 1));
    543     }
    544   }
    545 }
    546 
    547 
    548 void Shell::Load(const v8::FunctionCallbackInfo<v8::Value>& args) {
    549   for (int i = 0; i < args.Length(); i++) {
    550     HandleScope handle_scope(args.GetIsolate());
    551     String::Utf8Value file(args[i]);
    552     if (*file == NULL) {
    553       Throw(args.GetIsolate(), "Error loading file");
    554       return;
    555     }
    556     Handle<String> source = ReadFile(args.GetIsolate(), *file);
    557     if (source.IsEmpty()) {
    558       Throw(args.GetIsolate(), "Error loading file");
    559       return;
    560     }
    561     if (!ExecuteString(args.GetIsolate(),
    562                        source,
    563                        String::NewFromUtf8(args.GetIsolate(), *file),
    564                        false,
    565                        true)) {
    566       Throw(args.GetIsolate(), "Error executing file");
    567       return;
    568     }
    569   }
    570 }
    571 
    572 
    573 void Shell::Quit(const v8::FunctionCallbackInfo<v8::Value>& args) {
    574   int exit_code = args[0]->Int32Value();
    575   OnExit();
    576   exit(exit_code);
    577 }
    578 
    579 
    580 void Shell::Version(const v8::FunctionCallbackInfo<v8::Value>& args) {
    581   args.GetReturnValue().Set(
    582       String::NewFromUtf8(args.GetIsolate(), V8::GetVersion()));
    583 }
    584 
    585 
    586 void Shell::ReportException(Isolate* isolate, v8::TryCatch* try_catch) {
    587   HandleScope handle_scope(isolate);
    588 #ifndef V8_SHARED
    589   Handle<Context> utility_context;
    590   bool enter_context = !isolate->InContext();
    591   if (enter_context) {
    592     utility_context = Local<Context>::New(isolate, utility_context_);
    593     utility_context->Enter();
    594   }
    595 #endif  // !V8_SHARED
    596   v8::String::Utf8Value exception(try_catch->Exception());
    597   const char* exception_string = ToCString(exception);
    598   Handle<Message> message = try_catch->Message();
    599   if (message.IsEmpty()) {
    600     // V8 didn't provide any extra information about this error; just
    601     // print the exception.
    602     printf("%s\n", exception_string);
    603   } else {
    604     // Print (filename):(line number): (message).
    605     v8::String::Utf8Value filename(message->GetScriptOrigin().ResourceName());
    606     const char* filename_string = ToCString(filename);
    607     int linenum = message->GetLineNumber();
    608     printf("%s:%i: %s\n", filename_string, linenum, exception_string);
    609     // Print line of source code.
    610     v8::String::Utf8Value sourceline(message->GetSourceLine());
    611     const char* sourceline_string = ToCString(sourceline);
    612     printf("%s\n", sourceline_string);
    613     // Print wavy underline (GetUnderline is deprecated).
    614     int start = message->GetStartColumn();
    615     for (int i = 0; i < start; i++) {
    616       printf(" ");
    617     }
    618     int end = message->GetEndColumn();
    619     for (int i = start; i < end; i++) {
    620       printf("^");
    621     }
    622     printf("\n");
    623     v8::String::Utf8Value stack_trace(try_catch->StackTrace());
    624     if (stack_trace.length() > 0) {
    625       const char* stack_trace_string = ToCString(stack_trace);
    626       printf("%s\n", stack_trace_string);
    627     }
    628   }
    629   printf("\n");
    630 #ifndef V8_SHARED
    631   if (enter_context) utility_context->Exit();
    632 #endif  // !V8_SHARED
    633 }
    634 
    635 
    636 #ifndef V8_SHARED
    637 Handle<Array> Shell::GetCompletions(Isolate* isolate,
    638                                     Handle<String> text,
    639                                     Handle<String> full) {
    640   EscapableHandleScope handle_scope(isolate);
    641   v8::Local<v8::Context> utility_context =
    642       v8::Local<v8::Context>::New(isolate, utility_context_);
    643   v8::Context::Scope context_scope(utility_context);
    644   Handle<Object> global = utility_context->Global();
    645   Local<Value> fun =
    646       global->Get(String::NewFromUtf8(isolate, "GetCompletions"));
    647   static const int kArgc = 3;
    648   v8::Local<v8::Context> evaluation_context =
    649       v8::Local<v8::Context>::New(isolate, evaluation_context_);
    650   Handle<Value> argv[kArgc] = { evaluation_context->Global(), text, full };
    651   Local<Value> val = Local<Function>::Cast(fun)->Call(global, kArgc, argv);
    652   return handle_scope.Escape(Local<Array>::Cast(val));
    653 }
    654 
    655 
    656 Local<Object> Shell::DebugMessageDetails(Isolate* isolate,
    657                                          Handle<String> message) {
    658   EscapableHandleScope handle_scope(isolate);
    659   v8::Local<v8::Context> context =
    660       v8::Local<v8::Context>::New(isolate, utility_context_);
    661   v8::Context::Scope context_scope(context);
    662   Handle<Object> global = context->Global();
    663   Handle<Value> fun =
    664       global->Get(String::NewFromUtf8(isolate, "DebugMessageDetails"));
    665   static const int kArgc = 1;
    666   Handle<Value> argv[kArgc] = { message };
    667   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
    668   return handle_scope.Escape(Local<Object>(Handle<Object>::Cast(val)));
    669 }
    670 
    671 
    672 Local<Value> Shell::DebugCommandToJSONRequest(Isolate* isolate,
    673                                               Handle<String> command) {
    674   EscapableHandleScope handle_scope(isolate);
    675   v8::Local<v8::Context> context =
    676       v8::Local<v8::Context>::New(isolate, utility_context_);
    677   v8::Context::Scope context_scope(context);
    678   Handle<Object> global = context->Global();
    679   Handle<Value> fun =
    680       global->Get(String::NewFromUtf8(isolate, "DebugCommandToJSONRequest"));
    681   static const int kArgc = 1;
    682   Handle<Value> argv[kArgc] = { command };
    683   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
    684   return handle_scope.Escape(Local<Value>(val));
    685 }
    686 
    687 
    688 int32_t* Counter::Bind(const char* name, bool is_histogram) {
    689   int i;
    690   for (i = 0; i < kMaxNameSize - 1 && name[i]; i++)
    691     name_[i] = static_cast<char>(name[i]);
    692   name_[i] = '\0';
    693   is_histogram_ = is_histogram;
    694   return ptr();
    695 }
    696 
    697 
    698 void Counter::AddSample(int32_t sample) {
    699   count_++;
    700   sample_total_ += sample;
    701 }
    702 
    703 
    704 CounterCollection::CounterCollection() {
    705   magic_number_ = 0xDEADFACE;
    706   max_counters_ = kMaxCounters;
    707   max_name_size_ = Counter::kMaxNameSize;
    708   counters_in_use_ = 0;
    709 }
    710 
    711 
    712 Counter* CounterCollection::GetNextCounter() {
    713   if (counters_in_use_ == kMaxCounters) return NULL;
    714   return &counters_[counters_in_use_++];
    715 }
    716 
    717 
    718 void Shell::MapCounters(v8::Isolate* isolate, const char* name) {
    719   counters_file_ = base::OS::MemoryMappedFile::create(
    720       name, sizeof(CounterCollection), &local_counters_);
    721   void* memory = (counters_file_ == NULL) ?
    722       NULL : counters_file_->memory();
    723   if (memory == NULL) {
    724     printf("Could not map counters file %s\n", name);
    725     Exit(1);
    726   }
    727   counters_ = static_cast<CounterCollection*>(memory);
    728   isolate->SetCounterFunction(LookupCounter);
    729   isolate->SetCreateHistogramFunction(CreateHistogram);
    730   isolate->SetAddHistogramSampleFunction(AddHistogramSample);
    731 }
    732 
    733 
    734 int CounterMap::Hash(const char* name) {
    735   int h = 0;
    736   int c;
    737   while ((c = *name++) != 0) {
    738     h += h << 5;
    739     h += c;
    740   }
    741   return h;
    742 }
    743 
    744 
    745 Counter* Shell::GetCounter(const char* name, bool is_histogram) {
    746   Counter* counter = counter_map_->Lookup(name);
    747 
    748   if (counter == NULL) {
    749     counter = counters_->GetNextCounter();
    750     if (counter != NULL) {
    751       counter_map_->Set(name, counter);
    752       counter->Bind(name, is_histogram);
    753     }
    754   } else {
    755     DCHECK(counter->is_histogram() == is_histogram);
    756   }
    757   return counter;
    758 }
    759 
    760 
    761 int* Shell::LookupCounter(const char* name) {
    762   Counter* counter = GetCounter(name, false);
    763 
    764   if (counter != NULL) {
    765     return counter->ptr();
    766   } else {
    767     return NULL;
    768   }
    769 }
    770 
    771 
    772 void* Shell::CreateHistogram(const char* name,
    773                              int min,
    774                              int max,
    775                              size_t buckets) {
    776   return GetCounter(name, true);
    777 }
    778 
    779 
    780 void Shell::AddHistogramSample(void* histogram, int sample) {
    781   Counter* counter = reinterpret_cast<Counter*>(histogram);
    782   counter->AddSample(sample);
    783 }
    784 
    785 
    786 void Shell::InstallUtilityScript(Isolate* isolate) {
    787   HandleScope scope(isolate);
    788   // If we use the utility context, we have to set the security tokens so that
    789   // utility, evaluation and debug context can all access each other.
    790   v8::Local<v8::Context> utility_context =
    791       v8::Local<v8::Context>::New(isolate, utility_context_);
    792   v8::Local<v8::Context> evaluation_context =
    793       v8::Local<v8::Context>::New(isolate, evaluation_context_);
    794   utility_context->SetSecurityToken(Undefined(isolate));
    795   evaluation_context->SetSecurityToken(Undefined(isolate));
    796   v8::Context::Scope context_scope(utility_context);
    797 
    798   if (i::FLAG_debugger) printf("JavaScript debugger enabled\n");
    799   // Install the debugger object in the utility scope
    800   i::Debug* debug = reinterpret_cast<i::Isolate*>(isolate)->debug();
    801   debug->Load();
    802   i::Handle<i::Context> debug_context = debug->debug_context();
    803   i::Handle<i::JSObject> js_debug
    804       = i::Handle<i::JSObject>(debug_context->global_object());
    805   utility_context->Global()->Set(String::NewFromUtf8(isolate, "$debug"),
    806                                  Utils::ToLocal(js_debug));
    807   debug_context->set_security_token(
    808       reinterpret_cast<i::Isolate*>(isolate)->heap()->undefined_value());
    809 
    810   // Run the d8 shell utility script in the utility context
    811   int source_index = i::NativesCollection<i::D8>::GetIndex("d8");
    812   i::Vector<const char> shell_source =
    813       i::NativesCollection<i::D8>::GetRawScriptSource(source_index);
    814   i::Vector<const char> shell_source_name =
    815       i::NativesCollection<i::D8>::GetScriptName(source_index);
    816   Handle<String> source =
    817       String::NewFromUtf8(isolate, shell_source.start(), String::kNormalString,
    818                           shell_source.length());
    819   Handle<String> name =
    820       String::NewFromUtf8(isolate, shell_source_name.start(),
    821                           String::kNormalString, shell_source_name.length());
    822   ScriptOrigin origin(name);
    823   Handle<Script> script = Script::Compile(source, &origin);
    824   script->Run();
    825   // Mark the d8 shell script as native to avoid it showing up as normal source
    826   // in the debugger.
    827   i::Handle<i::Object> compiled_script = Utils::OpenHandle(*script);
    828   i::Handle<i::Script> script_object = compiled_script->IsJSFunction()
    829       ? i::Handle<i::Script>(i::Script::cast(
    830           i::JSFunction::cast(*compiled_script)->shared()->script()))
    831       : i::Handle<i::Script>(i::Script::cast(
    832           i::SharedFunctionInfo::cast(*compiled_script)->script()));
    833   script_object->set_type(i::Smi::FromInt(i::Script::TYPE_NATIVE));
    834 
    835   // Start the in-process debugger if requested.
    836   if (i::FLAG_debugger) v8::Debug::SetDebugEventListener(HandleDebugEvent);
    837 }
    838 #endif  // !V8_SHARED
    839 
    840 
    841 #ifdef COMPRESS_STARTUP_DATA_BZ2
    842 class BZip2Decompressor : public v8::StartupDataDecompressor {
    843  public:
    844   virtual ~BZip2Decompressor() { }
    845 
    846  protected:
    847   virtual int DecompressData(char* raw_data,
    848                              int* raw_data_size,
    849                              const char* compressed_data,
    850                              int compressed_data_size) {
    851     DCHECK_EQ(v8::StartupData::kBZip2,
    852               v8::V8::GetCompressedStartupDataAlgorithm());
    853     unsigned int decompressed_size = *raw_data_size;
    854     int result =
    855         BZ2_bzBuffToBuffDecompress(raw_data,
    856                                    &decompressed_size,
    857                                    const_cast<char*>(compressed_data),
    858                                    compressed_data_size,
    859                                    0, 1);
    860     if (result == BZ_OK) {
    861       *raw_data_size = decompressed_size;
    862     }
    863     return result;
    864   }
    865 };
    866 #endif
    867 
    868 
    869 Handle<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
    870   Handle<ObjectTemplate> global_template = ObjectTemplate::New(isolate);
    871   global_template->Set(String::NewFromUtf8(isolate, "print"),
    872                        FunctionTemplate::New(isolate, Print));
    873   global_template->Set(String::NewFromUtf8(isolate, "write"),
    874                        FunctionTemplate::New(isolate, Write));
    875   global_template->Set(String::NewFromUtf8(isolate, "read"),
    876                        FunctionTemplate::New(isolate, Read));
    877   global_template->Set(String::NewFromUtf8(isolate, "readbuffer"),
    878                        FunctionTemplate::New(isolate, ReadBuffer));
    879   global_template->Set(String::NewFromUtf8(isolate, "readline"),
    880                        FunctionTemplate::New(isolate, ReadLine));
    881   global_template->Set(String::NewFromUtf8(isolate, "load"),
    882                        FunctionTemplate::New(isolate, Load));
    883   global_template->Set(String::NewFromUtf8(isolate, "quit"),
    884                        FunctionTemplate::New(isolate, Quit));
    885   global_template->Set(String::NewFromUtf8(isolate, "version"),
    886                        FunctionTemplate::New(isolate, Version));
    887 
    888   // Bind the Realm object.
    889   Handle<ObjectTemplate> realm_template = ObjectTemplate::New(isolate);
    890   realm_template->Set(String::NewFromUtf8(isolate, "current"),
    891                       FunctionTemplate::New(isolate, RealmCurrent));
    892   realm_template->Set(String::NewFromUtf8(isolate, "owner"),
    893                       FunctionTemplate::New(isolate, RealmOwner));
    894   realm_template->Set(String::NewFromUtf8(isolate, "global"),
    895                       FunctionTemplate::New(isolate, RealmGlobal));
    896   realm_template->Set(String::NewFromUtf8(isolate, "create"),
    897                       FunctionTemplate::New(isolate, RealmCreate));
    898   realm_template->Set(String::NewFromUtf8(isolate, "dispose"),
    899                       FunctionTemplate::New(isolate, RealmDispose));
    900   realm_template->Set(String::NewFromUtf8(isolate, "switch"),
    901                       FunctionTemplate::New(isolate, RealmSwitch));
    902   realm_template->Set(String::NewFromUtf8(isolate, "eval"),
    903                       FunctionTemplate::New(isolate, RealmEval));
    904   realm_template->SetAccessor(String::NewFromUtf8(isolate, "shared"),
    905                               RealmSharedGet, RealmSharedSet);
    906   global_template->Set(String::NewFromUtf8(isolate, "Realm"), realm_template);
    907 
    908 #ifndef V8_SHARED
    909   Handle<ObjectTemplate> performance_template = ObjectTemplate::New(isolate);
    910   performance_template->Set(String::NewFromUtf8(isolate, "now"),
    911                             FunctionTemplate::New(isolate, PerformanceNow));
    912   global_template->Set(String::NewFromUtf8(isolate, "performance"),
    913                        performance_template);
    914 #endif  // !V8_SHARED
    915 
    916   Handle<ObjectTemplate> os_templ = ObjectTemplate::New(isolate);
    917   AddOSMethods(isolate, os_templ);
    918   global_template->Set(String::NewFromUtf8(isolate, "os"), os_templ);
    919 
    920   return global_template;
    921 }
    922 
    923 
    924 void Shell::Initialize(Isolate* isolate) {
    925 #ifdef COMPRESS_STARTUP_DATA_BZ2
    926   BZip2Decompressor startup_data_decompressor;
    927   int bz2_result = startup_data_decompressor.Decompress();
    928   if (bz2_result != BZ_OK) {
    929     fprintf(stderr, "bzip error code: %d\n", bz2_result);
    930     Exit(1);
    931   }
    932 #endif
    933 
    934 #ifndef V8_SHARED
    935   Shell::counter_map_ = new CounterMap();
    936   // Set up counters
    937   if (i::StrLength(i::FLAG_map_counters) != 0)
    938     MapCounters(isolate, i::FLAG_map_counters);
    939   if (i::FLAG_dump_counters || i::FLAG_track_gc_object_stats) {
    940     isolate->SetCounterFunction(LookupCounter);
    941     isolate->SetCreateHistogramFunction(CreateHistogram);
    942     isolate->SetAddHistogramSampleFunction(AddHistogramSample);
    943   }
    944 #endif  // !V8_SHARED
    945 }
    946 
    947 
    948 void Shell::InitializeDebugger(Isolate* isolate) {
    949   if (options.test_shell) return;
    950 #ifndef V8_SHARED
    951   HandleScope scope(isolate);
    952   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    953   utility_context_.Reset(isolate,
    954                          Context::New(isolate, NULL, global_template));
    955 #endif  // !V8_SHARED
    956 }
    957 
    958 
    959 Local<Context> Shell::CreateEvaluationContext(Isolate* isolate) {
    960 #ifndef V8_SHARED
    961   // This needs to be a critical section since this is not thread-safe
    962   base::LockGuard<base::Mutex> lock_guard(&context_mutex_);
    963 #endif  // !V8_SHARED
    964   // Initialize the global objects
    965   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    966   EscapableHandleScope handle_scope(isolate);
    967   Local<Context> context = Context::New(isolate, NULL, global_template);
    968   DCHECK(!context.IsEmpty());
    969   Context::Scope scope(context);
    970 
    971 #ifndef V8_SHARED
    972   i::Factory* factory = reinterpret_cast<i::Isolate*>(isolate)->factory();
    973   i::JSArguments js_args = i::FLAG_js_arguments;
    974   i::Handle<i::FixedArray> arguments_array =
    975       factory->NewFixedArray(js_args.argc);
    976   for (int j = 0; j < js_args.argc; j++) {
    977     i::Handle<i::String> arg =
    978         factory->NewStringFromUtf8(i::CStrVector(js_args[j])).ToHandleChecked();
    979     arguments_array->set(j, *arg);
    980   }
    981   i::Handle<i::JSArray> arguments_jsarray =
    982       factory->NewJSArrayWithElements(arguments_array);
    983   context->Global()->Set(String::NewFromUtf8(isolate, "arguments"),
    984                          Utils::ToLocal(arguments_jsarray));
    985 #endif  // !V8_SHARED
    986   return handle_scope.Escape(context);
    987 }
    988 
    989 
    990 void Shell::Exit(int exit_code) {
    991   // Use _exit instead of exit to avoid races between isolate
    992   // threads and static destructors.
    993   fflush(stdout);
    994   fflush(stderr);
    995   _exit(exit_code);
    996 }
    997 
    998 
    999 #ifndef V8_SHARED
   1000 struct CounterAndKey {
   1001   Counter* counter;
   1002   const char* key;
   1003 };
   1004 
   1005 
   1006 inline bool operator<(const CounterAndKey& lhs, const CounterAndKey& rhs) {
   1007   return strcmp(lhs.key, rhs.key) < 0;
   1008 }
   1009 #endif  // !V8_SHARED
   1010 
   1011 
   1012 void Shell::OnExit() {
   1013   LineEditor* line_editor = LineEditor::Get();
   1014   if (line_editor) line_editor->Close();
   1015 #ifndef V8_SHARED
   1016   if (i::FLAG_dump_counters) {
   1017     int number_of_counters = 0;
   1018     for (CounterMap::Iterator i(counter_map_); i.More(); i.Next()) {
   1019       number_of_counters++;
   1020     }
   1021     CounterAndKey* counters = new CounterAndKey[number_of_counters];
   1022     int j = 0;
   1023     for (CounterMap::Iterator i(counter_map_); i.More(); i.Next(), j++) {
   1024       counters[j].counter = i.CurrentValue();
   1025       counters[j].key = i.CurrentKey();
   1026     }
   1027     std::sort(counters, counters + number_of_counters);
   1028     printf("+----------------------------------------------------------------+"
   1029            "-------------+\n");
   1030     printf("| Name                                                           |"
   1031            " Value       |\n");
   1032     printf("+----------------------------------------------------------------+"
   1033            "-------------+\n");
   1034     for (j = 0; j < number_of_counters; j++) {
   1035       Counter* counter = counters[j].counter;
   1036       const char* key = counters[j].key;
   1037       if (counter->is_histogram()) {
   1038         printf("| c:%-60s | %11i |\n", key, counter->count());
   1039         printf("| t:%-60s | %11i |\n", key, counter->sample_total());
   1040       } else {
   1041         printf("| %-62s | %11i |\n", key, counter->count());
   1042       }
   1043     }
   1044     printf("+----------------------------------------------------------------+"
   1045            "-------------+\n");
   1046     delete [] counters;
   1047   }
   1048   delete counters_file_;
   1049   delete counter_map_;
   1050 #endif  // !V8_SHARED
   1051 }
   1052 
   1053 
   1054 
   1055 static FILE* FOpen(const char* path, const char* mode) {
   1056 #if defined(_MSC_VER) && (defined(_WIN32) || defined(_WIN64))
   1057   FILE* result;
   1058   if (fopen_s(&result, path, mode) == 0) {
   1059     return result;
   1060   } else {
   1061     return NULL;
   1062   }
   1063 #else
   1064   FILE* file = fopen(path, mode);
   1065   if (file == NULL) return NULL;
   1066   struct stat file_stat;
   1067   if (fstat(fileno(file), &file_stat) != 0) return NULL;
   1068   bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0);
   1069   if (is_regular_file) return file;
   1070   fclose(file);
   1071   return NULL;
   1072 #endif
   1073 }
   1074 
   1075 
   1076 static char* ReadChars(Isolate* isolate, const char* name, int* size_out) {
   1077   FILE* file = FOpen(name, "rb");
   1078   if (file == NULL) return NULL;
   1079 
   1080   fseek(file, 0, SEEK_END);
   1081   int size = ftell(file);
   1082   rewind(file);
   1083 
   1084   char* chars = new char[size + 1];
   1085   chars[size] = '\0';
   1086   for (int i = 0; i < size;) {
   1087     int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
   1088     i += read;
   1089   }
   1090   fclose(file);
   1091   *size_out = size;
   1092   return chars;
   1093 }
   1094 
   1095 
   1096 struct DataAndPersistent {
   1097   uint8_t* data;
   1098   Persistent<ArrayBuffer> handle;
   1099 };
   1100 
   1101 
   1102 static void ReadBufferWeakCallback(
   1103     const v8::WeakCallbackData<ArrayBuffer, DataAndPersistent>& data) {
   1104   size_t byte_length = data.GetValue()->ByteLength();
   1105   data.GetIsolate()->AdjustAmountOfExternalAllocatedMemory(
   1106       -static_cast<intptr_t>(byte_length));
   1107 
   1108   delete[] data.GetParameter()->data;
   1109   data.GetParameter()->handle.Reset();
   1110   delete data.GetParameter();
   1111 }
   1112 
   1113 
   1114 void Shell::ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args) {
   1115   DCHECK(sizeof(char) == sizeof(uint8_t));  // NOLINT
   1116   String::Utf8Value filename(args[0]);
   1117   int length;
   1118   if (*filename == NULL) {
   1119     Throw(args.GetIsolate(), "Error loading file");
   1120     return;
   1121   }
   1122 
   1123   Isolate* isolate = args.GetIsolate();
   1124   DataAndPersistent* data = new DataAndPersistent;
   1125   data->data = reinterpret_cast<uint8_t*>(
   1126       ReadChars(args.GetIsolate(), *filename, &length));
   1127   if (data->data == NULL) {
   1128     delete data;
   1129     Throw(args.GetIsolate(), "Error reading file");
   1130     return;
   1131   }
   1132   Handle<v8::ArrayBuffer> buffer =
   1133       ArrayBuffer::New(isolate, data->data, length);
   1134   data->handle.Reset(isolate, buffer);
   1135   data->handle.SetWeak(data, ReadBufferWeakCallback);
   1136   data->handle.MarkIndependent();
   1137   isolate->AdjustAmountOfExternalAllocatedMemory(length);
   1138 
   1139   args.GetReturnValue().Set(buffer);
   1140 }
   1141 
   1142 
   1143 // Reads a file into a v8 string.
   1144 Handle<String> Shell::ReadFile(Isolate* isolate, const char* name) {
   1145   int size = 0;
   1146   char* chars = ReadChars(isolate, name, &size);
   1147   if (chars == NULL) return Handle<String>();
   1148   Handle<String> result =
   1149       String::NewFromUtf8(isolate, chars, String::kNormalString, size);
   1150   delete[] chars;
   1151   return result;
   1152 }
   1153 
   1154 
   1155 void Shell::RunShell(Isolate* isolate) {
   1156   HandleScope outer_scope(isolate);
   1157   v8::Local<v8::Context> context =
   1158       v8::Local<v8::Context>::New(isolate, evaluation_context_);
   1159   v8::Context::Scope context_scope(context);
   1160   PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1161   Handle<String> name = String::NewFromUtf8(isolate, "(d8)");
   1162   LineEditor* console = LineEditor::Get();
   1163   printf("V8 version %s [console: %s]\n", V8::GetVersion(), console->name());
   1164   console->Open(isolate);
   1165   while (true) {
   1166     HandleScope inner_scope(isolate);
   1167     Handle<String> input = console->Prompt(Shell::kPrompt);
   1168     if (input.IsEmpty()) break;
   1169     ExecuteString(isolate, input, name, true, true);
   1170   }
   1171   printf("\n");
   1172 }
   1173 
   1174 
   1175 SourceGroup::~SourceGroup() {
   1176 #ifndef V8_SHARED
   1177   delete thread_;
   1178   thread_ = NULL;
   1179 #endif  // !V8_SHARED
   1180 }
   1181 
   1182 
   1183 void SourceGroup::Execute(Isolate* isolate) {
   1184   bool exception_was_thrown = false;
   1185   for (int i = begin_offset_; i < end_offset_; ++i) {
   1186     const char* arg = argv_[i];
   1187     if (strcmp(arg, "-e") == 0 && i + 1 < end_offset_) {
   1188       // Execute argument given to -e option directly.
   1189       HandleScope handle_scope(isolate);
   1190       Handle<String> file_name = String::NewFromUtf8(isolate, "unnamed");
   1191       Handle<String> source = String::NewFromUtf8(isolate, argv_[i + 1]);
   1192       if (!Shell::ExecuteString(isolate, source, file_name, false, true)) {
   1193         exception_was_thrown = true;
   1194         break;
   1195       }
   1196       ++i;
   1197     } else if (arg[0] == '-') {
   1198       // Ignore other options. They have been parsed already.
   1199     } else {
   1200       // Use all other arguments as names of files to load and run.
   1201       HandleScope handle_scope(isolate);
   1202       Handle<String> file_name = String::NewFromUtf8(isolate, arg);
   1203       Handle<String> source = ReadFile(isolate, arg);
   1204       if (source.IsEmpty()) {
   1205         printf("Error reading '%s'\n", arg);
   1206         Shell::Exit(1);
   1207       }
   1208       if (!Shell::ExecuteString(isolate, source, file_name, false, true)) {
   1209         exception_was_thrown = true;
   1210         break;
   1211       }
   1212     }
   1213   }
   1214   if (exception_was_thrown != Shell::options.expected_to_throw) {
   1215     Shell::Exit(1);
   1216   }
   1217 }
   1218 
   1219 
   1220 Handle<String> SourceGroup::ReadFile(Isolate* isolate, const char* name) {
   1221   int size;
   1222   char* chars = ReadChars(isolate, name, &size);
   1223   if (chars == NULL) return Handle<String>();
   1224   Handle<String> result =
   1225       String::NewFromUtf8(isolate, chars, String::kNormalString, size);
   1226   delete[] chars;
   1227   return result;
   1228 }
   1229 
   1230 
   1231 #ifndef V8_SHARED
   1232 base::Thread::Options SourceGroup::GetThreadOptions() {
   1233   // On some systems (OSX 10.6) the stack size default is 0.5Mb or less
   1234   // which is not enough to parse the big literal expressions used in tests.
   1235   // The stack size should be at least StackGuard::kLimitSize + some
   1236   // OS-specific padding for thread startup code.  2Mbytes seems to be enough.
   1237   return base::Thread::Options("IsolateThread", 2 * MB);
   1238 }
   1239 
   1240 
   1241 void SourceGroup::ExecuteInThread() {
   1242   Isolate* isolate = Isolate::New();
   1243   do {
   1244     next_semaphore_.Wait();
   1245     {
   1246       Isolate::Scope iscope(isolate);
   1247       {
   1248         HandleScope scope(isolate);
   1249         PerIsolateData data(isolate);
   1250         Local<Context> context = Shell::CreateEvaluationContext(isolate);
   1251         {
   1252           Context::Scope cscope(context);
   1253           PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1254           Execute(isolate);
   1255         }
   1256       }
   1257       if (Shell::options.send_idle_notification) {
   1258         const int kLongIdlePauseInMs = 1000;
   1259         isolate->ContextDisposedNotification();
   1260         isolate->IdleNotification(kLongIdlePauseInMs);
   1261       }
   1262       if (Shell::options.invoke_weak_callbacks) {
   1263         // By sending a low memory notifications, we will try hard to collect
   1264         // all garbage and will therefore also invoke all weak callbacks of
   1265         // actually unreachable persistent handles.
   1266         isolate->LowMemoryNotification();
   1267       }
   1268     }
   1269     done_semaphore_.Signal();
   1270   } while (!Shell::options.last_run);
   1271 
   1272   isolate->Dispose();
   1273 }
   1274 
   1275 
   1276 void SourceGroup::StartExecuteInThread() {
   1277   if (thread_ == NULL) {
   1278     thread_ = new IsolateThread(this);
   1279     thread_->Start();
   1280   }
   1281   next_semaphore_.Signal();
   1282 }
   1283 
   1284 
   1285 void SourceGroup::WaitForThread() {
   1286   if (thread_ == NULL) return;
   1287   if (Shell::options.last_run) {
   1288     thread_->Join();
   1289   } else {
   1290     done_semaphore_.Wait();
   1291   }
   1292 }
   1293 #endif  // !V8_SHARED
   1294 
   1295 
   1296 void SetFlagsFromString(const char* flags) {
   1297   v8::V8::SetFlagsFromString(flags, static_cast<int>(strlen(flags)));
   1298 }
   1299 
   1300 
   1301 bool Shell::SetOptions(int argc, char* argv[]) {
   1302   bool logfile_per_isolate = false;
   1303   for (int i = 0; i < argc; i++) {
   1304     if (strcmp(argv[i], "--stress-opt") == 0) {
   1305       options.stress_opt = true;
   1306       argv[i] = NULL;
   1307     } else if (strcmp(argv[i], "--nostress-opt") == 0) {
   1308       options.stress_opt = false;
   1309       argv[i] = NULL;
   1310     } else if (strcmp(argv[i], "--stress-deopt") == 0) {
   1311       options.stress_deopt = true;
   1312       argv[i] = NULL;
   1313     } else if (strcmp(argv[i], "--mock-arraybuffer-allocator") == 0) {
   1314       options.mock_arraybuffer_allocator = true;
   1315       argv[i] = NULL;
   1316     } else if (strcmp(argv[i], "--noalways-opt") == 0) {
   1317       // No support for stressing if we can't use --always-opt.
   1318       options.stress_opt = false;
   1319       options.stress_deopt = false;
   1320     } else if (strcmp(argv[i], "--logfile-per-isolate") == 0) {
   1321       logfile_per_isolate = true;
   1322       argv[i] = NULL;
   1323     } else if (strcmp(argv[i], "--shell") == 0) {
   1324       options.interactive_shell = true;
   1325       argv[i] = NULL;
   1326     } else if (strcmp(argv[i], "--test") == 0) {
   1327       options.test_shell = true;
   1328       argv[i] = NULL;
   1329     } else if (strcmp(argv[i], "--send-idle-notification") == 0) {
   1330       options.send_idle_notification = true;
   1331       argv[i] = NULL;
   1332     } else if (strcmp(argv[i], "--invoke-weak-callbacks") == 0) {
   1333       options.invoke_weak_callbacks = true;
   1334       // TODO(jochen) See issue 3351
   1335       options.send_idle_notification = true;
   1336       argv[i] = NULL;
   1337     } else if (strcmp(argv[i], "-f") == 0) {
   1338       // Ignore any -f flags for compatibility with other stand-alone
   1339       // JavaScript engines.
   1340       continue;
   1341     } else if (strcmp(argv[i], "--isolate") == 0) {
   1342 #ifdef V8_SHARED
   1343       printf("D8 with shared library does not support multi-threading\n");
   1344       return false;
   1345 #endif  // V8_SHARED
   1346       options.num_isolates++;
   1347     } else if (strcmp(argv[i], "--dump-heap-constants") == 0) {
   1348 #ifdef V8_SHARED
   1349       printf("D8 with shared library does not support constant dumping\n");
   1350       return false;
   1351 #else
   1352       options.dump_heap_constants = true;
   1353       argv[i] = NULL;
   1354 #endif  // V8_SHARED
   1355     } else if (strcmp(argv[i], "--throws") == 0) {
   1356       options.expected_to_throw = true;
   1357       argv[i] = NULL;
   1358     } else if (strncmp(argv[i], "--icu-data-file=", 16) == 0) {
   1359       options.icu_data_file = argv[i] + 16;
   1360       argv[i] = NULL;
   1361 #ifdef V8_SHARED
   1362     } else if (strcmp(argv[i], "--dump-counters") == 0) {
   1363       printf("D8 with shared library does not include counters\n");
   1364       return false;
   1365     } else if (strcmp(argv[i], "--debugger") == 0) {
   1366       printf("Javascript debugger not included\n");
   1367       return false;
   1368 #endif  // V8_SHARED
   1369 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   1370     } else if (strncmp(argv[i], "--natives_blob=", 15) == 0) {
   1371       options.natives_blob = argv[i] + 15;
   1372       argv[i] = NULL;
   1373     } else if (strncmp(argv[i], "--snapshot_blob=", 16) == 0) {
   1374       options.snapshot_blob = argv[i] + 16;
   1375       argv[i] = NULL;
   1376 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
   1377     } else if (strcmp(argv[i], "--cache") == 0 ||
   1378                strncmp(argv[i], "--cache=", 8) == 0) {
   1379       const char* value = argv[i] + 7;
   1380       if (!*value || strncmp(value, "=code", 6) == 0) {
   1381         options.compile_options = v8::ScriptCompiler::kProduceCodeCache;
   1382       } else if (strncmp(value, "=parse", 7) == 0) {
   1383         options.compile_options = v8::ScriptCompiler::kProduceParserCache;
   1384       } else if (strncmp(value, "=none", 6) == 0) {
   1385         options.compile_options = v8::ScriptCompiler::kNoCompileOptions;
   1386       } else {
   1387         printf("Unknown option to --cache.\n");
   1388         return false;
   1389       }
   1390       argv[i] = NULL;
   1391     }
   1392   }
   1393 
   1394   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
   1395 
   1396   // Set up isolated source groups.
   1397   options.isolate_sources = new SourceGroup[options.num_isolates];
   1398   SourceGroup* current = options.isolate_sources;
   1399   current->Begin(argv, 1);
   1400   for (int i = 1; i < argc; i++) {
   1401     const char* str = argv[i];
   1402     if (strcmp(str, "--isolate") == 0) {
   1403       current->End(i);
   1404       current++;
   1405       current->Begin(argv, i + 1);
   1406     } else if (strncmp(argv[i], "--", 2) == 0) {
   1407       printf("Warning: unknown flag %s.\nTry --help for options\n", argv[i]);
   1408     }
   1409   }
   1410   current->End(argc);
   1411 
   1412   if (!logfile_per_isolate && options.num_isolates) {
   1413     SetFlagsFromString("--nologfile_per_isolate");
   1414   }
   1415 
   1416   return true;
   1417 }
   1418 
   1419 
   1420 int Shell::RunMain(Isolate* isolate, int argc, char* argv[]) {
   1421 #ifndef V8_SHARED
   1422   for (int i = 1; i < options.num_isolates; ++i) {
   1423     options.isolate_sources[i].StartExecuteInThread();
   1424   }
   1425 #endif  // !V8_SHARED
   1426   {
   1427     HandleScope scope(isolate);
   1428     Local<Context> context = CreateEvaluationContext(isolate);
   1429     if (options.last_run && options.use_interactive_shell()) {
   1430       // Keep using the same context in the interactive shell.
   1431       evaluation_context_.Reset(isolate, context);
   1432 #ifndef V8_SHARED
   1433       // If the interactive debugger is enabled make sure to activate
   1434       // it before running the files passed on the command line.
   1435       if (i::FLAG_debugger) {
   1436         InstallUtilityScript(isolate);
   1437       }
   1438 #endif  // !V8_SHARED
   1439     }
   1440     {
   1441       Context::Scope cscope(context);
   1442       PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1443       options.isolate_sources[0].Execute(isolate);
   1444     }
   1445   }
   1446   if (options.send_idle_notification) {
   1447     const int kLongIdlePauseInMs = 1000;
   1448     isolate->ContextDisposedNotification();
   1449     isolate->IdleNotification(kLongIdlePauseInMs);
   1450   }
   1451   if (options.invoke_weak_callbacks) {
   1452     // By sending a low memory notifications, we will try hard to collect all
   1453     // garbage and will therefore also invoke all weak callbacks of actually
   1454     // unreachable persistent handles.
   1455     isolate->LowMemoryNotification();
   1456   }
   1457 
   1458 #ifndef V8_SHARED
   1459   for (int i = 1; i < options.num_isolates; ++i) {
   1460     options.isolate_sources[i].WaitForThread();
   1461   }
   1462 #endif  // !V8_SHARED
   1463   return 0;
   1464 }
   1465 
   1466 
   1467 #ifndef V8_SHARED
   1468 static void DumpHeapConstants(i::Isolate* isolate) {
   1469   i::Heap* heap = isolate->heap();
   1470 
   1471   // Dump the INSTANCE_TYPES table to the console.
   1472   printf("# List of known V8 instance types.\n");
   1473 #define DUMP_TYPE(T) printf("  %d: \"%s\",\n", i::T, #T);
   1474   printf("INSTANCE_TYPES = {\n");
   1475   INSTANCE_TYPE_LIST(DUMP_TYPE)
   1476   printf("}\n");
   1477 #undef DUMP_TYPE
   1478 
   1479   // Dump the KNOWN_MAP table to the console.
   1480   printf("\n# List of known V8 maps.\n");
   1481 #define ROOT_LIST_CASE(type, name, camel_name) \
   1482   if (n == NULL && o == heap->name()) n = #camel_name;
   1483 #define STRUCT_LIST_CASE(upper_name, camel_name, name) \
   1484   if (n == NULL && o == heap->name##_map()) n = #camel_name "Map";
   1485   i::HeapObjectIterator it(heap->map_space());
   1486   printf("KNOWN_MAPS = {\n");
   1487   for (i::Object* o = it.Next(); o != NULL; o = it.Next()) {
   1488     i::Map* m = i::Map::cast(o);
   1489     const char* n = NULL;
   1490     intptr_t p = reinterpret_cast<intptr_t>(m) & 0xfffff;
   1491     int t = m->instance_type();
   1492     ROOT_LIST(ROOT_LIST_CASE)
   1493     STRUCT_LIST(STRUCT_LIST_CASE)
   1494     if (n == NULL) continue;
   1495     printf("  0x%05" V8PRIxPTR ": (%d, \"%s\"),\n", p, t, n);
   1496   }
   1497   printf("}\n");
   1498 #undef STRUCT_LIST_CASE
   1499 #undef ROOT_LIST_CASE
   1500 
   1501   // Dump the KNOWN_OBJECTS table to the console.
   1502   printf("\n# List of known V8 objects.\n");
   1503 #define ROOT_LIST_CASE(type, name, camel_name) \
   1504   if (n == NULL && o == heap->name()) n = #camel_name;
   1505   i::OldSpaces spit(heap);
   1506   printf("KNOWN_OBJECTS = {\n");
   1507   for (i::PagedSpace* s = spit.next(); s != NULL; s = spit.next()) {
   1508     i::HeapObjectIterator it(s);
   1509     const char* sname = AllocationSpaceName(s->identity());
   1510     for (i::Object* o = it.Next(); o != NULL; o = it.Next()) {
   1511       const char* n = NULL;
   1512       intptr_t p = reinterpret_cast<intptr_t>(o) & 0xfffff;
   1513       ROOT_LIST(ROOT_LIST_CASE)
   1514       if (n == NULL) continue;
   1515       printf("  (\"%s\", 0x%05" V8PRIxPTR "): \"%s\",\n", sname, p, n);
   1516     }
   1517   }
   1518   printf("}\n");
   1519 #undef ROOT_LIST_CASE
   1520 }
   1521 #endif  // !V8_SHARED
   1522 
   1523 
   1524 class ShellArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   1525  public:
   1526   virtual void* Allocate(size_t length) {
   1527     void* data = AllocateUninitialized(length);
   1528     return data == NULL ? data : memset(data, 0, length);
   1529   }
   1530   virtual void* AllocateUninitialized(size_t length) { return malloc(length); }
   1531   virtual void Free(void* data, size_t) { free(data); }
   1532 };
   1533 
   1534 
   1535 class MockArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   1536  public:
   1537   virtual void* Allocate(size_t) OVERRIDE {
   1538     return malloc(0);
   1539   }
   1540   virtual void* AllocateUninitialized(size_t length) OVERRIDE {
   1541     return malloc(0);
   1542   }
   1543   virtual void Free(void* p, size_t) OVERRIDE {
   1544     free(p);
   1545   }
   1546 };
   1547 
   1548 
   1549 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   1550 class StartupDataHandler {
   1551  public:
   1552   StartupDataHandler(const char* natives_blob,
   1553                      const char* snapshot_blob) {
   1554     Load(natives_blob, &natives_, v8::V8::SetNativesDataBlob);
   1555     Load(snapshot_blob, &snapshot_, v8::V8::SetSnapshotDataBlob);
   1556   }
   1557 
   1558   ~StartupDataHandler() {
   1559     delete[] natives_.data;
   1560     delete[] snapshot_.data;
   1561   }
   1562 
   1563  private:
   1564   void Load(const char* blob_file,
   1565             v8::StartupData* startup_data,
   1566             void (*setter_fn)(v8::StartupData*)) {
   1567     startup_data->data = NULL;
   1568     startup_data->compressed_size = 0;
   1569     startup_data->raw_size = 0;
   1570 
   1571     if (!blob_file)
   1572       return;
   1573 
   1574     FILE* file = fopen(blob_file, "rb");
   1575     if (!file)
   1576       return;
   1577 
   1578     fseek(file, 0, SEEK_END);
   1579     startup_data->raw_size = ftell(file);
   1580     rewind(file);
   1581 
   1582     startup_data->data = new char[startup_data->raw_size];
   1583     startup_data->compressed_size = fread(
   1584         const_cast<char*>(startup_data->data), 1, startup_data->raw_size,
   1585         file);
   1586     fclose(file);
   1587 
   1588     if (startup_data->raw_size == startup_data->compressed_size)
   1589       (*setter_fn)(startup_data);
   1590   }
   1591 
   1592   v8::StartupData natives_;
   1593   v8::StartupData snapshot_;
   1594 
   1595   // Disallow copy & assign.
   1596   StartupDataHandler(const StartupDataHandler& other);
   1597   void operator=(const StartupDataHandler& other);
   1598 };
   1599 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
   1600 
   1601 
   1602 int Shell::Main(int argc, char* argv[]) {
   1603 #if (defined(_WIN32) || defined(_WIN64))
   1604   UINT new_flags =
   1605       SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX | SEM_NOOPENFILEERRORBOX;
   1606   UINT existing_flags = SetErrorMode(new_flags);
   1607   SetErrorMode(existing_flags | new_flags);
   1608 #if defined(_MSC_VER)
   1609   _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
   1610   _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDERR);
   1611   _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
   1612   _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
   1613   _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
   1614   _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
   1615   _set_error_mode(_OUT_TO_STDERR);
   1616 #endif  // defined(_MSC_VER)
   1617 #endif  // defined(_WIN32) || defined(_WIN64)
   1618   if (!SetOptions(argc, argv)) return 1;
   1619   v8::V8::InitializeICU(options.icu_data_file);
   1620   v8::Platform* platform = v8::platform::CreateDefaultPlatform();
   1621   v8::V8::InitializePlatform(platform);
   1622   v8::V8::Initialize();
   1623 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   1624   StartupDataHandler startup_data(options.natives_blob, options.snapshot_blob);
   1625 #endif
   1626   SetFlagsFromString("--trace-hydrogen-file=hydrogen.cfg");
   1627   SetFlagsFromString("--redirect-code-traces-to=code.asm");
   1628   ShellArrayBufferAllocator array_buffer_allocator;
   1629   MockArrayBufferAllocator mock_arraybuffer_allocator;
   1630   if (options.mock_arraybuffer_allocator) {
   1631     v8::V8::SetArrayBufferAllocator(&mock_arraybuffer_allocator);
   1632   } else {
   1633     v8::V8::SetArrayBufferAllocator(&array_buffer_allocator);
   1634   }
   1635   int result = 0;
   1636   Isolate::CreateParams create_params;
   1637 #if !defined(V8_SHARED) && defined(ENABLE_GDB_JIT_INTERFACE)
   1638   if (i::FLAG_gdbjit) {
   1639     create_params.code_event_handler = i::GDBJITInterface::EventHandler;
   1640   }
   1641 #endif
   1642 #ifdef ENABLE_VTUNE_JIT_INTERFACE
   1643   vTune::InitializeVtuneForV8(create_params);
   1644 #endif
   1645 #ifndef V8_SHARED
   1646   create_params.constraints.ConfigureDefaults(
   1647       base::SysInfo::AmountOfPhysicalMemory(),
   1648       base::SysInfo::AmountOfVirtualMemory(),
   1649       base::SysInfo::NumberOfProcessors());
   1650 #endif
   1651   Isolate* isolate = Isolate::New(create_params);
   1652   DumbLineEditor dumb_line_editor(isolate);
   1653   {
   1654     Isolate::Scope scope(isolate);
   1655     Initialize(isolate);
   1656     PerIsolateData data(isolate);
   1657     InitializeDebugger(isolate);
   1658 
   1659 #ifndef V8_SHARED
   1660     if (options.dump_heap_constants) {
   1661       DumpHeapConstants(reinterpret_cast<i::Isolate*>(isolate));
   1662       return 0;
   1663     }
   1664 #endif
   1665 
   1666     if (options.stress_opt || options.stress_deopt) {
   1667       Testing::SetStressRunType(options.stress_opt
   1668                                 ? Testing::kStressTypeOpt
   1669                                 : Testing::kStressTypeDeopt);
   1670       int stress_runs = Testing::GetStressRuns();
   1671       for (int i = 0; i < stress_runs && result == 0; i++) {
   1672         printf("============ Stress %d/%d ============\n", i + 1, stress_runs);
   1673         Testing::PrepareStressRun(i);
   1674         options.last_run = (i == stress_runs - 1);
   1675         result = RunMain(isolate, argc, argv);
   1676       }
   1677       printf("======== Full Deoptimization =======\n");
   1678       Testing::DeoptimizeAll();
   1679 #if !defined(V8_SHARED)
   1680     } else if (i::FLAG_stress_runs > 0) {
   1681       int stress_runs = i::FLAG_stress_runs;
   1682       for (int i = 0; i < stress_runs && result == 0; i++) {
   1683         printf("============ Run %d/%d ============\n", i + 1, stress_runs);
   1684         options.last_run = (i == stress_runs - 1);
   1685         result = RunMain(isolate, argc, argv);
   1686       }
   1687 #endif
   1688     } else {
   1689       result = RunMain(isolate, argc, argv);
   1690     }
   1691 
   1692     // Run interactive shell if explicitly requested or if no script has been
   1693     // executed, but never on --test
   1694     if (options.use_interactive_shell()) {
   1695 #ifndef V8_SHARED
   1696       if (!i::FLAG_debugger) {
   1697         InstallUtilityScript(isolate);
   1698       }
   1699 #endif  // !V8_SHARED
   1700       RunShell(isolate);
   1701     }
   1702   }
   1703   isolate->Dispose();
   1704   V8::Dispose();
   1705   V8::ShutdownPlatform();
   1706   delete platform;
   1707 
   1708   OnExit();
   1709 
   1710   return result;
   1711 }
   1712 
   1713 }  // namespace v8
   1714 
   1715 
   1716 #ifndef GOOGLE3
   1717 int main(int argc, char* argv[]) {
   1718   return v8::Shell::Main(argc, argv);
   1719 }
   1720 #endif
   1721