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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 
     29 // Defined when linking against shared lib on Windows.
     30 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
     31 #define V8_SHARED
     32 #endif
     33 
     34 #ifdef COMPRESS_STARTUP_DATA_BZ2
     35 #include <bzlib.h>
     36 #endif
     37 
     38 #include <errno.h>
     39 #include <stdlib.h>
     40 #include <string.h>
     41 #include <sys/stat.h>
     42 
     43 #ifdef V8_SHARED
     44 #include <assert.h>
     45 #endif  // V8_SHARED
     46 
     47 #ifndef V8_SHARED
     48 #include <algorithm>
     49 #endif  // !V8_SHARED
     50 
     51 #ifdef V8_SHARED
     52 #include "../include/v8-testing.h"
     53 #endif  // V8_SHARED
     54 
     55 #ifdef ENABLE_VTUNE_JIT_INTERFACE
     56 #include "third_party/vtune/v8-vtune.h"
     57 #endif
     58 
     59 #include "d8.h"
     60 
     61 #ifndef V8_SHARED
     62 #include "api.h"
     63 #include "checks.h"
     64 #include "cpu.h"
     65 #include "d8-debug.h"
     66 #include "debug.h"
     67 #include "natives.h"
     68 #include "platform.h"
     69 #include "v8.h"
     70 #endif  // V8_SHARED
     71 
     72 #if !defined(_WIN32) && !defined(_WIN64)
     73 #include <unistd.h>  // NOLINT
     74 #endif
     75 
     76 #ifndef ASSERT
     77 #define ASSERT(condition) assert(condition)
     78 #endif
     79 
     80 namespace v8 {
     81 
     82 
     83 static Handle<Value> Throw(Isolate* isolate, const char* message) {
     84   return isolate->ThrowException(String::NewFromUtf8(isolate, message));
     85 }
     86 
     87 
     88 
     89 class PerIsolateData {
     90  public:
     91   explicit PerIsolateData(Isolate* isolate) : isolate_(isolate), realms_(NULL) {
     92     HandleScope scope(isolate);
     93     isolate->SetData(0, this);
     94   }
     95 
     96   ~PerIsolateData() {
     97     isolate_->SetData(0, NULL);  // Not really needed, just to be sure...
     98   }
     99 
    100   inline static PerIsolateData* Get(Isolate* isolate) {
    101     return reinterpret_cast<PerIsolateData*>(isolate->GetData(0));
    102   }
    103 
    104   class RealmScope {
    105    public:
    106     explicit RealmScope(PerIsolateData* data);
    107     ~RealmScope();
    108    private:
    109     PerIsolateData* data_;
    110   };
    111 
    112  private:
    113   friend class Shell;
    114   friend class RealmScope;
    115   Isolate* isolate_;
    116   int realm_count_;
    117   int realm_current_;
    118   int realm_switch_;
    119   Persistent<Context>* realms_;
    120   Persistent<Value> realm_shared_;
    121 
    122   int RealmFind(Handle<Context> context);
    123 };
    124 
    125 
    126 LineEditor *LineEditor::current_ = NULL;
    127 
    128 
    129 LineEditor::LineEditor(Type type, const char* name)
    130     : type_(type), name_(name) {
    131   if (current_ == NULL || current_->type_ < type) current_ = this;
    132 }
    133 
    134 
    135 class DumbLineEditor: public LineEditor {
    136  public:
    137   explicit DumbLineEditor(Isolate* isolate)
    138       : LineEditor(LineEditor::DUMB, "dumb"), isolate_(isolate) { }
    139   virtual Handle<String> Prompt(const char* prompt);
    140  private:
    141   Isolate* isolate_;
    142 };
    143 
    144 
    145 Handle<String> DumbLineEditor::Prompt(const char* prompt) {
    146   printf("%s", prompt);
    147 #if defined(__native_client__)
    148   // Native Client libc is used to being embedded in Chrome and
    149   // has trouble recognizing when to flush.
    150   fflush(stdout);
    151 #endif
    152   return Shell::ReadFromStdin(isolate_);
    153 }
    154 
    155 
    156 #ifndef V8_SHARED
    157 CounterMap* Shell::counter_map_;
    158 i::OS::MemoryMappedFile* Shell::counters_file_ = NULL;
    159 CounterCollection Shell::local_counters_;
    160 CounterCollection* Shell::counters_ = &local_counters_;
    161 i::Mutex Shell::context_mutex_;
    162 const i::TimeTicks Shell::kInitialTicks = i::TimeTicks::HighResolutionNow();
    163 Persistent<Context> Shell::utility_context_;
    164 #endif  // V8_SHARED
    165 
    166 Persistent<Context> Shell::evaluation_context_;
    167 ShellOptions Shell::options;
    168 const char* Shell::kPrompt = "d8> ";
    169 
    170 
    171 const int MB = 1024 * 1024;
    172 
    173 
    174 #ifndef V8_SHARED
    175 bool CounterMap::Match(void* key1, void* key2) {
    176   const char* name1 = reinterpret_cast<const char*>(key1);
    177   const char* name2 = reinterpret_cast<const char*>(key2);
    178   return strcmp(name1, name2) == 0;
    179 }
    180 #endif  // V8_SHARED
    181 
    182 
    183 // Converts a V8 value to a C string.
    184 const char* Shell::ToCString(const v8::String::Utf8Value& value) {
    185   return *value ? *value : "<string conversion failed>";
    186 }
    187 
    188 
    189 // Executes a string within the current v8 context.
    190 bool Shell::ExecuteString(Isolate* isolate,
    191                           Handle<String> source,
    192                           Handle<Value> name,
    193                           bool print_result,
    194                           bool report_exceptions) {
    195 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
    196   bool FLAG_debugger = i::FLAG_debugger;
    197 #else
    198   bool FLAG_debugger = false;
    199 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
    200   HandleScope handle_scope(isolate);
    201   TryCatch try_catch;
    202   options.script_executed = true;
    203   if (FLAG_debugger) {
    204     // When debugging make exceptions appear to be uncaught.
    205     try_catch.SetVerbose(true);
    206   }
    207   Handle<Script> script = Script::New(source, name);
    208   if (script.IsEmpty()) {
    209     // Print errors that happened during compilation.
    210     if (report_exceptions && !FLAG_debugger)
    211       ReportException(isolate, &try_catch);
    212     return false;
    213   } else {
    214     PerIsolateData* data = PerIsolateData::Get(isolate);
    215     Local<Context> realm =
    216         Local<Context>::New(isolate, data->realms_[data->realm_current_]);
    217     realm->Enter();
    218     Handle<Value> result = script->Run();
    219     realm->Exit();
    220     data->realm_current_ = data->realm_switch_;
    221     if (result.IsEmpty()) {
    222       ASSERT(try_catch.HasCaught());
    223       // Print errors that happened during execution.
    224       if (report_exceptions && !FLAG_debugger)
    225         ReportException(isolate, &try_catch);
    226       return false;
    227     } else {
    228       ASSERT(!try_catch.HasCaught());
    229       if (print_result) {
    230 #if !defined(V8_SHARED)
    231         if (options.test_shell) {
    232 #endif
    233           if (!result->IsUndefined()) {
    234             // If all went well and the result wasn't undefined then print
    235             // the returned value.
    236             v8::String::Utf8Value str(result);
    237             fwrite(*str, sizeof(**str), str.length(), stdout);
    238             printf("\n");
    239           }
    240 #if !defined(V8_SHARED)
    241         } else {
    242           v8::TryCatch try_catch;
    243           v8::Local<v8::Context> context =
    244               v8::Local<v8::Context>::New(isolate, utility_context_);
    245           v8::Context::Scope context_scope(context);
    246           Handle<Object> global = context->Global();
    247           Handle<Value> fun =
    248               global->Get(String::NewFromUtf8(isolate, "Stringify"));
    249           Handle<Value> argv[1] = { result };
    250           Handle<Value> s = Handle<Function>::Cast(fun)->Call(global, 1, argv);
    251           if (try_catch.HasCaught()) return true;
    252           v8::String::Utf8Value str(s);
    253           fwrite(*str, sizeof(**str), str.length(), stdout);
    254           printf("\n");
    255         }
    256 #endif
    257       }
    258       return true;
    259     }
    260   }
    261 }
    262 
    263 
    264 PerIsolateData::RealmScope::RealmScope(PerIsolateData* data) : data_(data) {
    265   data_->realm_count_ = 1;
    266   data_->realm_current_ = 0;
    267   data_->realm_switch_ = 0;
    268   data_->realms_ = new Persistent<Context>[1];
    269   data_->realms_[0].Reset(data_->isolate_,
    270                           data_->isolate_->GetEnteredContext());
    271 }
    272 
    273 
    274 PerIsolateData::RealmScope::~RealmScope() {
    275   // Drop realms to avoid keeping them alive.
    276   for (int i = 0; i < data_->realm_count_; ++i)
    277     data_->realms_[i].Reset();
    278   delete[] data_->realms_;
    279   if (!data_->realm_shared_.IsEmpty())
    280     data_->realm_shared_.Reset();
    281 }
    282 
    283 
    284 int PerIsolateData::RealmFind(Handle<Context> context) {
    285   for (int i = 0; i < realm_count_; ++i) {
    286     if (realms_[i] == context) return i;
    287   }
    288   return -1;
    289 }
    290 
    291 
    292 #ifndef V8_SHARED
    293 // performance.now() returns a time stamp as double, measured in milliseconds.
    294 void Shell::PerformanceNow(const v8::FunctionCallbackInfo<v8::Value>& args) {
    295   i::TimeDelta delta = i::TimeTicks::HighResolutionNow() - kInitialTicks;
    296   args.GetReturnValue().Set(delta.InMillisecondsF());
    297 }
    298 #endif  // V8_SHARED
    299 
    300 
    301 // Realm.current() returns the index of the currently active realm.
    302 void Shell::RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args) {
    303   Isolate* isolate = args.GetIsolate();
    304   PerIsolateData* data = PerIsolateData::Get(isolate);
    305   int index = data->RealmFind(isolate->GetEnteredContext());
    306   if (index == -1) return;
    307   args.GetReturnValue().Set(index);
    308 }
    309 
    310 
    311 // Realm.owner(o) returns the index of the realm that created o.
    312 void Shell::RealmOwner(const v8::FunctionCallbackInfo<v8::Value>& args) {
    313   Isolate* isolate = args.GetIsolate();
    314   PerIsolateData* data = PerIsolateData::Get(isolate);
    315   if (args.Length() < 1 || !args[0]->IsObject()) {
    316     Throw(args.GetIsolate(), "Invalid argument");
    317     return;
    318   }
    319   int index = data->RealmFind(args[0]->ToObject()->CreationContext());
    320   if (index == -1) return;
    321   args.GetReturnValue().Set(index);
    322 }
    323 
    324 
    325 // Realm.global(i) returns the global object of realm i.
    326 // (Note that properties of global objects cannot be read/written cross-realm.)
    327 void Shell::RealmGlobal(const v8::FunctionCallbackInfo<v8::Value>& args) {
    328   PerIsolateData* data = PerIsolateData::Get(args.GetIsolate());
    329   if (args.Length() < 1 || !args[0]->IsNumber()) {
    330     Throw(args.GetIsolate(), "Invalid argument");
    331     return;
    332   }
    333   int index = args[0]->Uint32Value();
    334   if (index >= data->realm_count_ || data->realms_[index].IsEmpty()) {
    335     Throw(args.GetIsolate(), "Invalid realm index");
    336     return;
    337   }
    338   args.GetReturnValue().Set(
    339       Local<Context>::New(args.GetIsolate(), data->realms_[index])->Global());
    340 }
    341 
    342 
    343 // Realm.create() creates a new realm and returns its index.
    344 void Shell::RealmCreate(const v8::FunctionCallbackInfo<v8::Value>& args) {
    345   Isolate* isolate = args.GetIsolate();
    346   PerIsolateData* data = PerIsolateData::Get(isolate);
    347   Persistent<Context>* old_realms = data->realms_;
    348   int index = data->realm_count_;
    349   data->realms_ = new Persistent<Context>[++data->realm_count_];
    350   for (int i = 0; i < index; ++i) {
    351     data->realms_[i].Reset(isolate, old_realms[i]);
    352   }
    353   delete[] old_realms;
    354   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    355   data->realms_[index].Reset(
    356       isolate, Context::New(isolate, NULL, global_template));
    357   args.GetReturnValue().Set(index);
    358 }
    359 
    360 
    361 // Realm.dispose(i) disposes the reference to the realm i.
    362 void Shell::RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
    363   Isolate* isolate = args.GetIsolate();
    364   PerIsolateData* data = PerIsolateData::Get(isolate);
    365   if (args.Length() < 1 || !args[0]->IsNumber()) {
    366     Throw(args.GetIsolate(), "Invalid argument");
    367     return;
    368   }
    369   int index = args[0]->Uint32Value();
    370   if (index >= data->realm_count_ || data->realms_[index].IsEmpty() ||
    371       index == 0 ||
    372       index == data->realm_current_ || index == data->realm_switch_) {
    373     Throw(args.GetIsolate(), "Invalid realm index");
    374     return;
    375   }
    376   data->realms_[index].Reset();
    377 }
    378 
    379 
    380 // Realm.switch(i) switches to the realm i for consecutive interactive inputs.
    381 void Shell::RealmSwitch(const v8::FunctionCallbackInfo<v8::Value>& args) {
    382   Isolate* isolate = args.GetIsolate();
    383   PerIsolateData* data = PerIsolateData::Get(isolate);
    384   if (args.Length() < 1 || !args[0]->IsNumber()) {
    385     Throw(args.GetIsolate(), "Invalid argument");
    386     return;
    387   }
    388   int index = args[0]->Uint32Value();
    389   if (index >= data->realm_count_ || data->realms_[index].IsEmpty()) {
    390     Throw(args.GetIsolate(), "Invalid realm index");
    391     return;
    392   }
    393   data->realm_switch_ = index;
    394 }
    395 
    396 
    397 // Realm.eval(i, s) evaluates s in realm i and returns the result.
    398 void Shell::RealmEval(const v8::FunctionCallbackInfo<v8::Value>& args) {
    399   Isolate* isolate = args.GetIsolate();
    400   PerIsolateData* data = PerIsolateData::Get(isolate);
    401   if (args.Length() < 2 || !args[0]->IsNumber() || !args[1]->IsString()) {
    402     Throw(args.GetIsolate(), "Invalid argument");
    403     return;
    404   }
    405   int index = args[0]->Uint32Value();
    406   if (index >= data->realm_count_ || data->realms_[index].IsEmpty()) {
    407     Throw(args.GetIsolate(), "Invalid realm index");
    408     return;
    409   }
    410   Handle<Script> script = Script::New(args[1]->ToString());
    411   if (script.IsEmpty()) return;
    412   Local<Context> realm = Local<Context>::New(isolate, data->realms_[index]);
    413   realm->Enter();
    414   Handle<Value> result = script->Run();
    415   realm->Exit();
    416   args.GetReturnValue().Set(result);
    417 }
    418 
    419 
    420 // Realm.shared is an accessor for a single shared value across realms.
    421 void Shell::RealmSharedGet(Local<String> property,
    422                            const PropertyCallbackInfo<Value>& info) {
    423   Isolate* isolate = info.GetIsolate();
    424   PerIsolateData* data = PerIsolateData::Get(isolate);
    425   if (data->realm_shared_.IsEmpty()) return;
    426   info.GetReturnValue().Set(data->realm_shared_);
    427 }
    428 
    429 void Shell::RealmSharedSet(Local<String> property,
    430                            Local<Value> value,
    431                            const PropertyCallbackInfo<void>& info) {
    432   Isolate* isolate = info.GetIsolate();
    433   PerIsolateData* data = PerIsolateData::Get(isolate);
    434   data->realm_shared_.Reset(isolate, value);
    435 }
    436 
    437 
    438 void Shell::Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
    439   Write(args);
    440   printf("\n");
    441   fflush(stdout);
    442 }
    443 
    444 
    445 void Shell::Write(const v8::FunctionCallbackInfo<v8::Value>& args) {
    446   for (int i = 0; i < args.Length(); i++) {
    447     HandleScope handle_scope(args.GetIsolate());
    448     if (i != 0) {
    449       printf(" ");
    450     }
    451 
    452     // Explicitly catch potential exceptions in toString().
    453     v8::TryCatch try_catch;
    454     Handle<String> str_obj = args[i]->ToString();
    455     if (try_catch.HasCaught()) {
    456       try_catch.ReThrow();
    457       return;
    458     }
    459 
    460     v8::String::Utf8Value str(str_obj);
    461     int n = static_cast<int>(fwrite(*str, sizeof(**str), str.length(), stdout));
    462     if (n != str.length()) {
    463       printf("Error in fwrite\n");
    464       Exit(1);
    465     }
    466   }
    467 }
    468 
    469 
    470 void Shell::Read(const v8::FunctionCallbackInfo<v8::Value>& args) {
    471   String::Utf8Value file(args[0]);
    472   if (*file == NULL) {
    473     Throw(args.GetIsolate(), "Error loading file");
    474     return;
    475   }
    476   Handle<String> source = ReadFile(args.GetIsolate(), *file);
    477   if (source.IsEmpty()) {
    478     Throw(args.GetIsolate(), "Error loading file");
    479     return;
    480   }
    481   args.GetReturnValue().Set(source);
    482 }
    483 
    484 
    485 Handle<String> Shell::ReadFromStdin(Isolate* isolate) {
    486   static const int kBufferSize = 256;
    487   char buffer[kBufferSize];
    488   Handle<String> accumulator = String::NewFromUtf8(isolate, "");
    489   int length;
    490   while (true) {
    491     // Continue reading if the line ends with an escape '\\' or the line has
    492     // not been fully read into the buffer yet (does not end with '\n').
    493     // If fgets gets an error, just give up.
    494     char* input = NULL;
    495     {  // Release lock for blocking input.
    496       Unlocker unlock(isolate);
    497       input = fgets(buffer, kBufferSize, stdin);
    498     }
    499     if (input == NULL) return Handle<String>();
    500     length = static_cast<int>(strlen(buffer));
    501     if (length == 0) {
    502       return accumulator;
    503     } else if (buffer[length-1] != '\n') {
    504       accumulator = String::Concat(
    505           accumulator,
    506           String::NewFromUtf8(isolate, buffer, String::kNormalString, length));
    507     } else if (length > 1 && buffer[length-2] == '\\') {
    508       buffer[length-2] = '\n';
    509       accumulator = String::Concat(
    510           accumulator, String::NewFromUtf8(isolate, buffer,
    511                                            String::kNormalString, length - 1));
    512     } else {
    513       return String::Concat(
    514           accumulator, String::NewFromUtf8(isolate, buffer,
    515                                            String::kNormalString, length - 1));
    516     }
    517   }
    518 }
    519 
    520 
    521 void Shell::Load(const v8::FunctionCallbackInfo<v8::Value>& args) {
    522   for (int i = 0; i < args.Length(); i++) {
    523     HandleScope handle_scope(args.GetIsolate());
    524     String::Utf8Value file(args[i]);
    525     if (*file == NULL) {
    526       Throw(args.GetIsolate(), "Error loading file");
    527       return;
    528     }
    529     Handle<String> source = ReadFile(args.GetIsolate(), *file);
    530     if (source.IsEmpty()) {
    531       Throw(args.GetIsolate(), "Error loading file");
    532       return;
    533     }
    534     if (!ExecuteString(args.GetIsolate(),
    535                        source,
    536                        String::NewFromUtf8(args.GetIsolate(), *file),
    537                        false,
    538                        true)) {
    539       Throw(args.GetIsolate(), "Error executing file");
    540       return;
    541     }
    542   }
    543 }
    544 
    545 
    546 void Shell::Quit(const v8::FunctionCallbackInfo<v8::Value>& args) {
    547   int exit_code = args[0]->Int32Value();
    548   OnExit();
    549   exit(exit_code);
    550 }
    551 
    552 
    553 void Shell::Version(const v8::FunctionCallbackInfo<v8::Value>& args) {
    554   args.GetReturnValue().Set(
    555       String::NewFromUtf8(args.GetIsolate(), V8::GetVersion()));
    556 }
    557 
    558 
    559 void Shell::ReportException(Isolate* isolate, v8::TryCatch* try_catch) {
    560   HandleScope handle_scope(isolate);
    561 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
    562   Handle<Context> utility_context;
    563   bool enter_context = !isolate->InContext();
    564   if (enter_context) {
    565     utility_context = Local<Context>::New(isolate, utility_context_);
    566     utility_context->Enter();
    567   }
    568 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
    569   v8::String::Utf8Value exception(try_catch->Exception());
    570   const char* exception_string = ToCString(exception);
    571   Handle<Message> message = try_catch->Message();
    572   if (message.IsEmpty()) {
    573     // V8 didn't provide any extra information about this error; just
    574     // print the exception.
    575     printf("%s\n", exception_string);
    576   } else {
    577     // Print (filename):(line number): (message).
    578     v8::String::Utf8Value filename(message->GetScriptResourceName());
    579     const char* filename_string = ToCString(filename);
    580     int linenum = message->GetLineNumber();
    581     printf("%s:%i: %s\n", filename_string, linenum, exception_string);
    582     // Print line of source code.
    583     v8::String::Utf8Value sourceline(message->GetSourceLine());
    584     const char* sourceline_string = ToCString(sourceline);
    585     printf("%s\n", sourceline_string);
    586     // Print wavy underline (GetUnderline is deprecated).
    587     int start = message->GetStartColumn();
    588     for (int i = 0; i < start; i++) {
    589       printf(" ");
    590     }
    591     int end = message->GetEndColumn();
    592     for (int i = start; i < end; i++) {
    593       printf("^");
    594     }
    595     printf("\n");
    596     v8::String::Utf8Value stack_trace(try_catch->StackTrace());
    597     if (stack_trace.length() > 0) {
    598       const char* stack_trace_string = ToCString(stack_trace);
    599       printf("%s\n", stack_trace_string);
    600     }
    601   }
    602   printf("\n");
    603 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
    604   if (enter_context) utility_context->Exit();
    605 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
    606 }
    607 
    608 
    609 #ifndef V8_SHARED
    610 Handle<Array> Shell::GetCompletions(Isolate* isolate,
    611                                     Handle<String> text,
    612                                     Handle<String> full) {
    613   HandleScope handle_scope(isolate);
    614   v8::Local<v8::Context> utility_context =
    615       v8::Local<v8::Context>::New(isolate, utility_context_);
    616   v8::Context::Scope context_scope(utility_context);
    617   Handle<Object> global = utility_context->Global();
    618   Handle<Value> fun =
    619       global->Get(String::NewFromUtf8(isolate, "GetCompletions"));
    620   static const int kArgc = 3;
    621   v8::Local<v8::Context> evaluation_context =
    622       v8::Local<v8::Context>::New(isolate, evaluation_context_);
    623   Handle<Value> argv[kArgc] = { evaluation_context->Global(), text, full };
    624   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
    625   return handle_scope.Close(Handle<Array>::Cast(val));
    626 }
    627 
    628 
    629 #ifdef ENABLE_DEBUGGER_SUPPORT
    630 Handle<Object> Shell::DebugMessageDetails(Isolate* isolate,
    631                                           Handle<String> message) {
    632   HandleScope handle_scope(isolate);
    633   v8::Local<v8::Context> context =
    634       v8::Local<v8::Context>::New(isolate, utility_context_);
    635   v8::Context::Scope context_scope(context);
    636   Handle<Object> global = context->Global();
    637   Handle<Value> fun =
    638       global->Get(String::NewFromUtf8(isolate, "DebugMessageDetails"));
    639   static const int kArgc = 1;
    640   Handle<Value> argv[kArgc] = { message };
    641   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
    642   return Handle<Object>::Cast(val);
    643 }
    644 
    645 
    646 Handle<Value> Shell::DebugCommandToJSONRequest(Isolate* isolate,
    647                                                Handle<String> command) {
    648   HandleScope handle_scope(isolate);
    649   v8::Local<v8::Context> context =
    650       v8::Local<v8::Context>::New(isolate, utility_context_);
    651   v8::Context::Scope context_scope(context);
    652   Handle<Object> global = context->Global();
    653   Handle<Value> fun =
    654       global->Get(String::NewFromUtf8(isolate, "DebugCommandToJSONRequest"));
    655   static const int kArgc = 1;
    656   Handle<Value> argv[kArgc] = { command };
    657   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
    658   return val;
    659 }
    660 
    661 
    662 void Shell::DispatchDebugMessages() {
    663   Isolate* isolate = v8::Isolate::GetCurrent();
    664   HandleScope handle_scope(isolate);
    665   v8::Local<v8::Context> context =
    666       v8::Local<v8::Context>::New(isolate, Shell::evaluation_context_);
    667   v8::Context::Scope context_scope(context);
    668   v8::Debug::ProcessDebugMessages();
    669 }
    670 #endif  // ENABLE_DEBUGGER_SUPPORT
    671 #endif  // V8_SHARED
    672 
    673 
    674 #ifndef V8_SHARED
    675 int32_t* Counter::Bind(const char* name, bool is_histogram) {
    676   int i;
    677   for (i = 0; i < kMaxNameSize - 1 && name[i]; i++)
    678     name_[i] = static_cast<char>(name[i]);
    679   name_[i] = '\0';
    680   is_histogram_ = is_histogram;
    681   return ptr();
    682 }
    683 
    684 
    685 void Counter::AddSample(int32_t sample) {
    686   count_++;
    687   sample_total_ += sample;
    688 }
    689 
    690 
    691 CounterCollection::CounterCollection() {
    692   magic_number_ = 0xDEADFACE;
    693   max_counters_ = kMaxCounters;
    694   max_name_size_ = Counter::kMaxNameSize;
    695   counters_in_use_ = 0;
    696 }
    697 
    698 
    699 Counter* CounterCollection::GetNextCounter() {
    700   if (counters_in_use_ == kMaxCounters) return NULL;
    701   return &counters_[counters_in_use_++];
    702 }
    703 
    704 
    705 void Shell::MapCounters(const char* name) {
    706   counters_file_ = i::OS::MemoryMappedFile::create(
    707       name, sizeof(CounterCollection), &local_counters_);
    708   void* memory = (counters_file_ == NULL) ?
    709       NULL : counters_file_->memory();
    710   if (memory == NULL) {
    711     printf("Could not map counters file %s\n", name);
    712     Exit(1);
    713   }
    714   counters_ = static_cast<CounterCollection*>(memory);
    715   V8::SetCounterFunction(LookupCounter);
    716   V8::SetCreateHistogramFunction(CreateHistogram);
    717   V8::SetAddHistogramSampleFunction(AddHistogramSample);
    718 }
    719 
    720 
    721 int CounterMap::Hash(const char* name) {
    722   int h = 0;
    723   int c;
    724   while ((c = *name++) != 0) {
    725     h += h << 5;
    726     h += c;
    727   }
    728   return h;
    729 }
    730 
    731 
    732 Counter* Shell::GetCounter(const char* name, bool is_histogram) {
    733   Counter* counter = counter_map_->Lookup(name);
    734 
    735   if (counter == NULL) {
    736     counter = counters_->GetNextCounter();
    737     if (counter != NULL) {
    738       counter_map_->Set(name, counter);
    739       counter->Bind(name, is_histogram);
    740     }
    741   } else {
    742     ASSERT(counter->is_histogram() == is_histogram);
    743   }
    744   return counter;
    745 }
    746 
    747 
    748 int* Shell::LookupCounter(const char* name) {
    749   Counter* counter = GetCounter(name, false);
    750 
    751   if (counter != NULL) {
    752     return counter->ptr();
    753   } else {
    754     return NULL;
    755   }
    756 }
    757 
    758 
    759 void* Shell::CreateHistogram(const char* name,
    760                              int min,
    761                              int max,
    762                              size_t buckets) {
    763   return GetCounter(name, true);
    764 }
    765 
    766 
    767 void Shell::AddHistogramSample(void* histogram, int sample) {
    768   Counter* counter = reinterpret_cast<Counter*>(histogram);
    769   counter->AddSample(sample);
    770 }
    771 
    772 
    773 void Shell::InstallUtilityScript(Isolate* isolate) {
    774   Locker lock(isolate);
    775   HandleScope scope(isolate);
    776   // If we use the utility context, we have to set the security tokens so that
    777   // utility, evaluation and debug context can all access each other.
    778   v8::Local<v8::Context> utility_context =
    779       v8::Local<v8::Context>::New(isolate, utility_context_);
    780   v8::Local<v8::Context> evaluation_context =
    781       v8::Local<v8::Context>::New(isolate, evaluation_context_);
    782   utility_context->SetSecurityToken(Undefined(isolate));
    783   evaluation_context->SetSecurityToken(Undefined(isolate));
    784   v8::Context::Scope context_scope(utility_context);
    785 
    786 #ifdef ENABLE_DEBUGGER_SUPPORT
    787   if (i::FLAG_debugger) printf("JavaScript debugger enabled\n");
    788   // Install the debugger object in the utility scope
    789   i::Debug* debug = reinterpret_cast<i::Isolate*>(isolate)->debug();
    790   debug->Load();
    791   i::Handle<i::JSObject> js_debug
    792       = i::Handle<i::JSObject>(debug->debug_context()->global_object());
    793   utility_context->Global()->Set(String::NewFromUtf8(isolate, "$debug"),
    794                                  Utils::ToLocal(js_debug));
    795   debug->debug_context()->set_security_token(
    796       reinterpret_cast<i::Isolate*>(isolate)->heap()->undefined_value());
    797 #endif  // ENABLE_DEBUGGER_SUPPORT
    798 
    799   // Run the d8 shell utility script in the utility context
    800   int source_index = i::NativesCollection<i::D8>::GetIndex("d8");
    801   i::Vector<const char> shell_source =
    802       i::NativesCollection<i::D8>::GetRawScriptSource(source_index);
    803   i::Vector<const char> shell_source_name =
    804       i::NativesCollection<i::D8>::GetScriptName(source_index);
    805   Handle<String> source =
    806       String::NewFromUtf8(isolate, shell_source.start(), String::kNormalString,
    807                           shell_source.length());
    808   Handle<String> name =
    809       String::NewFromUtf8(isolate, shell_source_name.start(),
    810                           String::kNormalString, shell_source_name.length());
    811   Handle<Script> script = Script::Compile(source, name);
    812   script->Run();
    813   // Mark the d8 shell script as native to avoid it showing up as normal source
    814   // in the debugger.
    815   i::Handle<i::Object> compiled_script = Utils::OpenHandle(*script);
    816   i::Handle<i::Script> script_object = compiled_script->IsJSFunction()
    817       ? i::Handle<i::Script>(i::Script::cast(
    818           i::JSFunction::cast(*compiled_script)->shared()->script()))
    819       : i::Handle<i::Script>(i::Script::cast(
    820           i::SharedFunctionInfo::cast(*compiled_script)->script()));
    821   script_object->set_type(i::Smi::FromInt(i::Script::TYPE_NATIVE));
    822 
    823 #ifdef ENABLE_DEBUGGER_SUPPORT
    824   // Start the in-process debugger if requested.
    825   if (i::FLAG_debugger && !i::FLAG_debugger_agent) {
    826     v8::Debug::SetDebugEventListener2(HandleDebugEvent);
    827   }
    828 #endif  // ENABLE_DEBUGGER_SUPPORT
    829 }
    830 #endif  // V8_SHARED
    831 
    832 
    833 #ifdef COMPRESS_STARTUP_DATA_BZ2
    834 class BZip2Decompressor : public v8::StartupDataDecompressor {
    835  public:
    836   virtual ~BZip2Decompressor() { }
    837 
    838  protected:
    839   virtual int DecompressData(char* raw_data,
    840                              int* raw_data_size,
    841                              const char* compressed_data,
    842                              int compressed_data_size) {
    843     ASSERT_EQ(v8::StartupData::kBZip2,
    844               v8::V8::GetCompressedStartupDataAlgorithm());
    845     unsigned int decompressed_size = *raw_data_size;
    846     int result =
    847         BZ2_bzBuffToBuffDecompress(raw_data,
    848                                    &decompressed_size,
    849                                    const_cast<char*>(compressed_data),
    850                                    compressed_data_size,
    851                                    0, 1);
    852     if (result == BZ_OK) {
    853       *raw_data_size = decompressed_size;
    854     }
    855     return result;
    856   }
    857 };
    858 #endif
    859 
    860 
    861 Handle<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
    862   Handle<ObjectTemplate> global_template = ObjectTemplate::New();
    863   global_template->Set(String::NewFromUtf8(isolate, "print"),
    864                        FunctionTemplate::New(Print));
    865   global_template->Set(String::NewFromUtf8(isolate, "write"),
    866                        FunctionTemplate::New(Write));
    867   global_template->Set(String::NewFromUtf8(isolate, "read"),
    868                        FunctionTemplate::New(Read));
    869   global_template->Set(String::NewFromUtf8(isolate, "readbuffer"),
    870                        FunctionTemplate::New(ReadBuffer));
    871   global_template->Set(String::NewFromUtf8(isolate, "readline"),
    872                        FunctionTemplate::New(ReadLine));
    873   global_template->Set(String::NewFromUtf8(isolate, "load"),
    874                        FunctionTemplate::New(Load));
    875   global_template->Set(String::NewFromUtf8(isolate, "quit"),
    876                        FunctionTemplate::New(Quit));
    877   global_template->Set(String::NewFromUtf8(isolate, "version"),
    878                        FunctionTemplate::New(Version));
    879 
    880   // Bind the Realm object.
    881   Handle<ObjectTemplate> realm_template = ObjectTemplate::New();
    882   realm_template->Set(String::NewFromUtf8(isolate, "current"),
    883                       FunctionTemplate::New(RealmCurrent));
    884   realm_template->Set(String::NewFromUtf8(isolate, "owner"),
    885                       FunctionTemplate::New(RealmOwner));
    886   realm_template->Set(String::NewFromUtf8(isolate, "global"),
    887                       FunctionTemplate::New(RealmGlobal));
    888   realm_template->Set(String::NewFromUtf8(isolate, "create"),
    889                       FunctionTemplate::New(RealmCreate));
    890   realm_template->Set(String::NewFromUtf8(isolate, "dispose"),
    891                       FunctionTemplate::New(RealmDispose));
    892   realm_template->Set(String::NewFromUtf8(isolate, "switch"),
    893                       FunctionTemplate::New(RealmSwitch));
    894   realm_template->Set(String::NewFromUtf8(isolate, "eval"),
    895                       FunctionTemplate::New(RealmEval));
    896   realm_template->SetAccessor(String::NewFromUtf8(isolate, "shared"),
    897                               RealmSharedGet, RealmSharedSet);
    898   global_template->Set(String::NewFromUtf8(isolate, "Realm"), realm_template);
    899 
    900 #ifndef V8_SHARED
    901   Handle<ObjectTemplate> performance_template = ObjectTemplate::New();
    902   performance_template->Set(String::NewFromUtf8(isolate, "now"),
    903                             FunctionTemplate::New(PerformanceNow));
    904   global_template->Set(String::NewFromUtf8(isolate, "performance"),
    905                        performance_template);
    906 #endif  // V8_SHARED
    907 
    908 #if !defined(V8_SHARED) && !defined(_WIN32) && !defined(_WIN64)
    909   Handle<ObjectTemplate> os_templ = ObjectTemplate::New();
    910   AddOSMethods(isolate, os_templ);
    911   global_template->Set(String::NewFromUtf8(isolate, "os"), os_templ);
    912 #endif  // V8_SHARED
    913 
    914   return global_template;
    915 }
    916 
    917 
    918 void Shell::Initialize(Isolate* isolate) {
    919 #ifdef COMPRESS_STARTUP_DATA_BZ2
    920   BZip2Decompressor startup_data_decompressor;
    921   int bz2_result = startup_data_decompressor.Decompress();
    922   if (bz2_result != BZ_OK) {
    923     fprintf(stderr, "bzip error code: %d\n", bz2_result);
    924     Exit(1);
    925   }
    926 #endif
    927 
    928 #ifndef V8_SHARED
    929   Shell::counter_map_ = new CounterMap();
    930   // Set up counters
    931   if (i::StrLength(i::FLAG_map_counters) != 0)
    932     MapCounters(i::FLAG_map_counters);
    933   if (i::FLAG_dump_counters || i::FLAG_track_gc_object_stats) {
    934     V8::SetCounterFunction(LookupCounter);
    935     V8::SetCreateHistogramFunction(CreateHistogram);
    936     V8::SetAddHistogramSampleFunction(AddHistogramSample);
    937   }
    938 #endif  // V8_SHARED
    939 }
    940 
    941 
    942 void Shell::InitializeDebugger(Isolate* isolate) {
    943   if (options.test_shell) return;
    944 #ifndef V8_SHARED
    945   Locker lock(isolate);
    946   HandleScope scope(isolate);
    947   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    948   utility_context_.Reset(isolate,
    949                          Context::New(isolate, NULL, global_template));
    950 
    951 #ifdef ENABLE_DEBUGGER_SUPPORT
    952   // Start the debugger agent if requested.
    953   if (i::FLAG_debugger_agent) {
    954     v8::Debug::EnableAgent("d8 shell", i::FLAG_debugger_port, true);
    955     v8::Debug::SetDebugMessageDispatchHandler(DispatchDebugMessages, true);
    956   }
    957 #endif  // ENABLE_DEBUGGER_SUPPORT
    958 #endif  // V8_SHARED
    959 }
    960 
    961 
    962 Local<Context> Shell::CreateEvaluationContext(Isolate* isolate) {
    963 #ifndef V8_SHARED
    964   // This needs to be a critical section since this is not thread-safe
    965   i::LockGuard<i::Mutex> lock_guard(&context_mutex_);
    966 #endif  // V8_SHARED
    967   // Initialize the global objects
    968   Handle<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
    969   HandleScope handle_scope(isolate);
    970   Local<Context> context = Context::New(isolate, NULL, global_template);
    971   ASSERT(!context.IsEmpty());
    972   Context::Scope scope(context);
    973 
    974 #ifndef V8_SHARED
    975   i::Factory* factory = reinterpret_cast<i::Isolate*>(isolate)->factory();
    976   i::JSArguments js_args = i::FLAG_js_arguments;
    977   i::Handle<i::FixedArray> arguments_array =
    978       factory->NewFixedArray(js_args.argc);
    979   for (int j = 0; j < js_args.argc; j++) {
    980     i::Handle<i::String> arg =
    981         factory->NewStringFromUtf8(i::CStrVector(js_args[j]));
    982     arguments_array->set(j, *arg);
    983   }
    984   i::Handle<i::JSArray> arguments_jsarray =
    985       factory->NewJSArrayWithElements(arguments_array);
    986   context->Global()->Set(String::NewFromUtf8(isolate, "arguments"),
    987                          Utils::ToLocal(arguments_jsarray));
    988 #endif  // V8_SHARED
    989   return handle_scope.Close(context);
    990 }
    991 
    992 
    993 void Shell::Exit(int exit_code) {
    994   // Use _exit instead of exit to avoid races between isolate
    995   // threads and static destructors.
    996   fflush(stdout);
    997   fflush(stderr);
    998   _exit(exit_code);
    999 }
   1000 
   1001 
   1002 #ifndef V8_SHARED
   1003 struct CounterAndKey {
   1004   Counter* counter;
   1005   const char* key;
   1006 };
   1007 
   1008 
   1009 inline bool operator<(const CounterAndKey& lhs, const CounterAndKey& rhs) {
   1010   return strcmp(lhs.key, rhs.key) < 0;
   1011 }
   1012 #endif  // V8_SHARED
   1013 
   1014 
   1015 void Shell::OnExit() {
   1016   LineEditor* line_editor = LineEditor::Get();
   1017   if (line_editor) line_editor->Close();
   1018 #ifndef V8_SHARED
   1019   if (i::FLAG_dump_counters) {
   1020     int number_of_counters = 0;
   1021     for (CounterMap::Iterator i(counter_map_); i.More(); i.Next()) {
   1022       number_of_counters++;
   1023     }
   1024     CounterAndKey* counters = new CounterAndKey[number_of_counters];
   1025     int j = 0;
   1026     for (CounterMap::Iterator i(counter_map_); i.More(); i.Next(), j++) {
   1027       counters[j].counter = i.CurrentValue();
   1028       counters[j].key = i.CurrentKey();
   1029     }
   1030     std::sort(counters, counters + number_of_counters);
   1031     printf("+----------------------------------------------------------------+"
   1032            "-------------+\n");
   1033     printf("| Name                                                           |"
   1034            " Value       |\n");
   1035     printf("+----------------------------------------------------------------+"
   1036            "-------------+\n");
   1037     for (j = 0; j < number_of_counters; j++) {
   1038       Counter* counter = counters[j].counter;
   1039       const char* key = counters[j].key;
   1040       if (counter->is_histogram()) {
   1041         printf("| c:%-60s | %11i |\n", key, counter->count());
   1042         printf("| t:%-60s | %11i |\n", key, counter->sample_total());
   1043       } else {
   1044         printf("| %-62s | %11i |\n", key, counter->count());
   1045       }
   1046     }
   1047     printf("+----------------------------------------------------------------+"
   1048            "-------------+\n");
   1049     delete [] counters;
   1050   }
   1051   delete counters_file_;
   1052   delete counter_map_;
   1053 #endif  // V8_SHARED
   1054 }
   1055 
   1056 
   1057 
   1058 static FILE* FOpen(const char* path, const char* mode) {
   1059 #if defined(_MSC_VER) && (defined(_WIN32) || defined(_WIN64))
   1060   FILE* result;
   1061   if (fopen_s(&result, path, mode) == 0) {
   1062     return result;
   1063   } else {
   1064     return NULL;
   1065   }
   1066 #else
   1067   FILE* file = fopen(path, mode);
   1068   if (file == NULL) return NULL;
   1069   struct stat file_stat;
   1070   if (fstat(fileno(file), &file_stat) != 0) return NULL;
   1071   bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0);
   1072   if (is_regular_file) return file;
   1073   fclose(file);
   1074   return NULL;
   1075 #endif
   1076 }
   1077 
   1078 
   1079 static char* ReadChars(Isolate* isolate, const char* name, int* size_out) {
   1080   // Release the V8 lock while reading files.
   1081   v8::Unlocker unlocker(isolate);
   1082   FILE* file = FOpen(name, "rb");
   1083   if (file == NULL) return NULL;
   1084 
   1085   fseek(file, 0, SEEK_END);
   1086   int size = ftell(file);
   1087   rewind(file);
   1088 
   1089   char* chars = new char[size + 1];
   1090   chars[size] = '\0';
   1091   for (int i = 0; i < size;) {
   1092     int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
   1093     i += read;
   1094   }
   1095   fclose(file);
   1096   *size_out = size;
   1097   return chars;
   1098 }
   1099 
   1100 
   1101 struct DataAndPersistent {
   1102   uint8_t* data;
   1103   Persistent<ArrayBuffer> handle;
   1104 };
   1105 
   1106 
   1107 static void ReadBufferWeakCallback(
   1108     const v8::WeakCallbackData<ArrayBuffer, DataAndPersistent>& data) {
   1109   size_t byte_length = data.GetValue()->ByteLength();
   1110   data.GetIsolate()->AdjustAmountOfExternalAllocatedMemory(
   1111       -static_cast<intptr_t>(byte_length));
   1112 
   1113   delete[] data.GetParameter()->data;
   1114   data.GetParameter()->handle.Reset();
   1115   delete data.GetParameter();
   1116 }
   1117 
   1118 
   1119 void Shell::ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args) {
   1120   ASSERT(sizeof(char) == sizeof(uint8_t));  // NOLINT
   1121   String::Utf8Value filename(args[0]);
   1122   int length;
   1123   if (*filename == NULL) {
   1124     Throw(args.GetIsolate(), "Error loading file");
   1125     return;
   1126   }
   1127 
   1128   Isolate* isolate = args.GetIsolate();
   1129   DataAndPersistent* data = new DataAndPersistent;
   1130   data->data = reinterpret_cast<uint8_t*>(
   1131       ReadChars(args.GetIsolate(), *filename, &length));
   1132   if (data->data == NULL) {
   1133     delete data;
   1134     Throw(args.GetIsolate(), "Error reading file");
   1135     return;
   1136   }
   1137   Handle<v8::ArrayBuffer> buffer = ArrayBuffer::New(isolate, data, length);
   1138   data->handle.Reset(isolate, buffer);
   1139   data->handle.SetWeak(data, ReadBufferWeakCallback);
   1140   data->handle.MarkIndependent();
   1141   isolate->AdjustAmountOfExternalAllocatedMemory(length);
   1142 
   1143   args.GetReturnValue().Set(buffer);
   1144 }
   1145 
   1146 
   1147 #ifndef V8_SHARED
   1148 static char* ReadToken(char* data, char token) {
   1149   char* next = i::OS::StrChr(data, token);
   1150   if (next != NULL) {
   1151     *next = '\0';
   1152     return (next + 1);
   1153   }
   1154 
   1155   return NULL;
   1156 }
   1157 
   1158 
   1159 static char* ReadLine(char* data) {
   1160   return ReadToken(data, '\n');
   1161 }
   1162 
   1163 
   1164 static char* ReadWord(char* data) {
   1165   return ReadToken(data, ' ');
   1166 }
   1167 #endif  // V8_SHARED
   1168 
   1169 
   1170 // Reads a file into a v8 string.
   1171 Handle<String> Shell::ReadFile(Isolate* isolate, const char* name) {
   1172   int size = 0;
   1173   char* chars = ReadChars(isolate, name, &size);
   1174   if (chars == NULL) return Handle<String>();
   1175   Handle<String> result =
   1176       String::NewFromUtf8(isolate, chars, String::kNormalString, size);
   1177   delete[] chars;
   1178   return result;
   1179 }
   1180 
   1181 
   1182 void Shell::RunShell(Isolate* isolate) {
   1183   Locker locker(isolate);
   1184   HandleScope outer_scope(isolate);
   1185   v8::Local<v8::Context> context =
   1186       v8::Local<v8::Context>::New(isolate, evaluation_context_);
   1187   v8::Context::Scope context_scope(context);
   1188   PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1189   Handle<String> name = String::NewFromUtf8(isolate, "(d8)");
   1190   LineEditor* console = LineEditor::Get();
   1191   printf("V8 version %s [console: %s]\n", V8::GetVersion(), console->name());
   1192   console->Open(isolate);
   1193   while (true) {
   1194     HandleScope inner_scope(isolate);
   1195     Handle<String> input = console->Prompt(Shell::kPrompt);
   1196     if (input.IsEmpty()) break;
   1197     ExecuteString(isolate, input, name, true, true);
   1198   }
   1199   printf("\n");
   1200 }
   1201 
   1202 
   1203 #ifndef V8_SHARED
   1204 class ShellThread : public i::Thread {
   1205  public:
   1206   // Takes ownership of the underlying char array of |files|.
   1207   ShellThread(Isolate* isolate, char* files)
   1208       : Thread("d8:ShellThread"),
   1209         isolate_(isolate), files_(files) { }
   1210 
   1211   ~ShellThread() {
   1212     delete[] files_;
   1213   }
   1214 
   1215   virtual void Run();
   1216  private:
   1217   Isolate* isolate_;
   1218   char* files_;
   1219 };
   1220 
   1221 
   1222 void ShellThread::Run() {
   1223   char* ptr = files_;
   1224   while ((ptr != NULL) && (*ptr != '\0')) {
   1225     // For each newline-separated line.
   1226     char* next_line = ReadLine(ptr);
   1227 
   1228     if (*ptr == '#') {
   1229       // Skip comment lines.
   1230       ptr = next_line;
   1231       continue;
   1232     }
   1233 
   1234     // Prepare the context for this thread.
   1235     Locker locker(isolate_);
   1236     HandleScope outer_scope(isolate_);
   1237     Local<Context> thread_context =
   1238         Shell::CreateEvaluationContext(isolate_);
   1239     Context::Scope context_scope(thread_context);
   1240     PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate_));
   1241 
   1242     while ((ptr != NULL) && (*ptr != '\0')) {
   1243       HandleScope inner_scope(isolate_);
   1244       char* filename = ptr;
   1245       ptr = ReadWord(ptr);
   1246 
   1247       // Skip empty strings.
   1248       if (strlen(filename) == 0) {
   1249         continue;
   1250       }
   1251 
   1252       Handle<String> str = Shell::ReadFile(isolate_, filename);
   1253       if (str.IsEmpty()) {
   1254         printf("File '%s' not found\n", filename);
   1255         Shell::Exit(1);
   1256       }
   1257 
   1258       Shell::ExecuteString(
   1259           isolate_, str, String::NewFromUtf8(isolate_, filename), false, false);
   1260     }
   1261 
   1262     ptr = next_line;
   1263   }
   1264 }
   1265 #endif  // V8_SHARED
   1266 
   1267 
   1268 SourceGroup::~SourceGroup() {
   1269 #ifndef V8_SHARED
   1270   delete thread_;
   1271   thread_ = NULL;
   1272 #endif  // V8_SHARED
   1273 }
   1274 
   1275 
   1276 void SourceGroup::Execute(Isolate* isolate) {
   1277   bool exception_was_thrown = false;
   1278   for (int i = begin_offset_; i < end_offset_; ++i) {
   1279     const char* arg = argv_[i];
   1280     if (strcmp(arg, "-e") == 0 && i + 1 < end_offset_) {
   1281       // Execute argument given to -e option directly.
   1282       HandleScope handle_scope(isolate);
   1283       Handle<String> file_name = String::NewFromUtf8(isolate, "unnamed");
   1284       Handle<String> source = String::NewFromUtf8(isolate, argv_[i + 1]);
   1285       if (!Shell::ExecuteString(isolate, source, file_name, false, true)) {
   1286         exception_was_thrown = true;
   1287         break;
   1288       }
   1289       ++i;
   1290     } else if (arg[0] == '-') {
   1291       // Ignore other options. They have been parsed already.
   1292     } else {
   1293       // Use all other arguments as names of files to load and run.
   1294       HandleScope handle_scope(isolate);
   1295       Handle<String> file_name = String::NewFromUtf8(isolate, arg);
   1296       Handle<String> source = ReadFile(isolate, arg);
   1297       if (source.IsEmpty()) {
   1298         printf("Error reading '%s'\n", arg);
   1299         Shell::Exit(1);
   1300       }
   1301       if (!Shell::ExecuteString(isolate, source, file_name, false, true)) {
   1302         exception_was_thrown = true;
   1303         break;
   1304       }
   1305     }
   1306   }
   1307   if (exception_was_thrown != Shell::options.expected_to_throw) {
   1308     Shell::Exit(1);
   1309   }
   1310 }
   1311 
   1312 
   1313 Handle<String> SourceGroup::ReadFile(Isolate* isolate, const char* name) {
   1314   int size;
   1315   char* chars = ReadChars(isolate, name, &size);
   1316   if (chars == NULL) return Handle<String>();
   1317   Handle<String> result =
   1318       String::NewFromUtf8(isolate, chars, String::kNormalString, size);
   1319   delete[] chars;
   1320   return result;
   1321 }
   1322 
   1323 
   1324 #ifndef V8_SHARED
   1325 i::Thread::Options SourceGroup::GetThreadOptions() {
   1326   // On some systems (OSX 10.6) the stack size default is 0.5Mb or less
   1327   // which is not enough to parse the big literal expressions used in tests.
   1328   // The stack size should be at least StackGuard::kLimitSize + some
   1329   // OS-specific padding for thread startup code.  2Mbytes seems to be enough.
   1330   return i::Thread::Options("IsolateThread", 2 * MB);
   1331 }
   1332 
   1333 
   1334 void SourceGroup::ExecuteInThread() {
   1335   Isolate* isolate = Isolate::New();
   1336   do {
   1337     next_semaphore_.Wait();
   1338     {
   1339       Isolate::Scope iscope(isolate);
   1340       Locker lock(isolate);
   1341       {
   1342         HandleScope scope(isolate);
   1343         PerIsolateData data(isolate);
   1344         Local<Context> context = Shell::CreateEvaluationContext(isolate);
   1345         {
   1346           Context::Scope cscope(context);
   1347           PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1348           Execute(isolate);
   1349         }
   1350       }
   1351       if (Shell::options.send_idle_notification) {
   1352         const int kLongIdlePauseInMs = 1000;
   1353         V8::ContextDisposedNotification();
   1354         V8::IdleNotification(kLongIdlePauseInMs);
   1355       }
   1356     }
   1357     done_semaphore_.Signal();
   1358   } while (!Shell::options.last_run);
   1359   isolate->Dispose();
   1360 }
   1361 
   1362 
   1363 void SourceGroup::StartExecuteInThread() {
   1364   if (thread_ == NULL) {
   1365     thread_ = new IsolateThread(this);
   1366     thread_->Start();
   1367   }
   1368   next_semaphore_.Signal();
   1369 }
   1370 
   1371 
   1372 void SourceGroup::WaitForThread() {
   1373   if (thread_ == NULL) return;
   1374   if (Shell::options.last_run) {
   1375     thread_->Join();
   1376   } else {
   1377     done_semaphore_.Wait();
   1378   }
   1379 }
   1380 #endif  // V8_SHARED
   1381 
   1382 
   1383 bool Shell::SetOptions(int argc, char* argv[]) {
   1384   for (int i = 0; i < argc; i++) {
   1385     if (strcmp(argv[i], "--stress-opt") == 0) {
   1386       options.stress_opt = true;
   1387       argv[i] = NULL;
   1388     } else if (strcmp(argv[i], "--nostress-opt") == 0) {
   1389       options.stress_opt = false;
   1390       argv[i] = NULL;
   1391     } else if (strcmp(argv[i], "--stress-deopt") == 0) {
   1392       options.stress_deopt = true;
   1393       argv[i] = NULL;
   1394     } else if (strcmp(argv[i], "--mock-arraybuffer-allocator") == 0) {
   1395       options.mock_arraybuffer_allocator = true;
   1396       argv[i] = NULL;
   1397     } else if (strcmp(argv[i], "--noalways-opt") == 0) {
   1398       // No support for stressing if we can't use --always-opt.
   1399       options.stress_opt = false;
   1400       options.stress_deopt = false;
   1401     } else if (strcmp(argv[i], "--shell") == 0) {
   1402       options.interactive_shell = true;
   1403       argv[i] = NULL;
   1404     } else if (strcmp(argv[i], "--test") == 0) {
   1405       options.test_shell = true;
   1406       argv[i] = NULL;
   1407     } else if (strcmp(argv[i], "--send-idle-notification") == 0) {
   1408       options.send_idle_notification = true;
   1409       argv[i] = NULL;
   1410     } else if (strcmp(argv[i], "-f") == 0) {
   1411       // Ignore any -f flags for compatibility with other stand-alone
   1412       // JavaScript engines.
   1413       continue;
   1414     } else if (strcmp(argv[i], "--isolate") == 0) {
   1415 #ifdef V8_SHARED
   1416       printf("D8 with shared library does not support multi-threading\n");
   1417       return false;
   1418 #endif  // V8_SHARED
   1419       options.num_isolates++;
   1420     } else if (strcmp(argv[i], "-p") == 0) {
   1421 #ifdef V8_SHARED
   1422       printf("D8 with shared library does not support multi-threading\n");
   1423       return false;
   1424 #else
   1425       options.num_parallel_files++;
   1426 #endif  // V8_SHARED
   1427     } else if (strcmp(argv[i], "--dump-heap-constants") == 0) {
   1428 #ifdef V8_SHARED
   1429       printf("D8 with shared library does not support constant dumping\n");
   1430       return false;
   1431 #else
   1432       options.dump_heap_constants = true;
   1433       argv[i] = NULL;
   1434 #endif
   1435     } else if (strcmp(argv[i], "--throws") == 0) {
   1436       options.expected_to_throw = true;
   1437       argv[i] = NULL;
   1438     }
   1439 #ifdef V8_SHARED
   1440     else if (strcmp(argv[i], "--dump-counters") == 0) {
   1441       printf("D8 with shared library does not include counters\n");
   1442       return false;
   1443     } else if (strcmp(argv[i], "--debugger") == 0) {
   1444       printf("Javascript debugger not included\n");
   1445       return false;
   1446     }
   1447 #endif  // V8_SHARED
   1448   }
   1449 
   1450 #ifndef V8_SHARED
   1451   // Run parallel threads if we are not using --isolate
   1452   options.parallel_files = new char*[options.num_parallel_files];
   1453   int parallel_files_set = 0;
   1454   for (int i = 1; i < argc; i++) {
   1455     if (argv[i] == NULL) continue;
   1456     if (strcmp(argv[i], "-p") == 0 && i + 1 < argc) {
   1457       if (options.num_isolates > 1) {
   1458         printf("-p is not compatible with --isolate\n");
   1459         return false;
   1460       }
   1461       argv[i] = NULL;
   1462       i++;
   1463       options.parallel_files[parallel_files_set] = argv[i];
   1464       parallel_files_set++;
   1465       argv[i] = NULL;
   1466     }
   1467   }
   1468   if (parallel_files_set != options.num_parallel_files) {
   1469     printf("-p requires a file containing a list of files as parameter\n");
   1470     return false;
   1471   }
   1472 #endif  // V8_SHARED
   1473 
   1474   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
   1475 
   1476   // Set up isolated source groups.
   1477   options.isolate_sources = new SourceGroup[options.num_isolates];
   1478   SourceGroup* current = options.isolate_sources;
   1479   current->Begin(argv, 1);
   1480   for (int i = 1; i < argc; i++) {
   1481     const char* str = argv[i];
   1482     if (strcmp(str, "--isolate") == 0) {
   1483       current->End(i);
   1484       current++;
   1485       current->Begin(argv, i + 1);
   1486     } else if (strncmp(argv[i], "--", 2) == 0) {
   1487       printf("Warning: unknown flag %s.\nTry --help for options\n", argv[i]);
   1488     }
   1489   }
   1490   current->End(argc);
   1491 
   1492   return true;
   1493 }
   1494 
   1495 
   1496 int Shell::RunMain(Isolate* isolate, int argc, char* argv[]) {
   1497 #ifndef V8_SHARED
   1498   i::List<i::Thread*> threads(1);
   1499   if (options.parallel_files != NULL) {
   1500     for (int i = 0; i < options.num_parallel_files; i++) {
   1501       char* files = NULL;
   1502       { Locker lock(isolate);
   1503         int size = 0;
   1504         files = ReadChars(isolate, options.parallel_files[i], &size);
   1505       }
   1506       if (files == NULL) {
   1507         printf("File list '%s' not found\n", options.parallel_files[i]);
   1508         Exit(1);
   1509       }
   1510       ShellThread* thread = new ShellThread(isolate, files);
   1511       thread->Start();
   1512       threads.Add(thread);
   1513     }
   1514   }
   1515   for (int i = 1; i < options.num_isolates; ++i) {
   1516     options.isolate_sources[i].StartExecuteInThread();
   1517   }
   1518 #endif  // V8_SHARED
   1519   {  // NOLINT
   1520     Locker lock(isolate);
   1521     {
   1522       HandleScope scope(isolate);
   1523       Local<Context> context = CreateEvaluationContext(isolate);
   1524       if (options.last_run) {
   1525         // Keep using the same context in the interactive shell.
   1526         evaluation_context_.Reset(isolate, context);
   1527 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
   1528         // If the interactive debugger is enabled make sure to activate
   1529         // it before running the files passed on the command line.
   1530         if (i::FLAG_debugger) {
   1531           InstallUtilityScript(isolate);
   1532         }
   1533 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
   1534       }
   1535       {
   1536         Context::Scope cscope(context);
   1537         PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
   1538         options.isolate_sources[0].Execute(isolate);
   1539       }
   1540     }
   1541     if (!options.last_run) {
   1542       if (options.send_idle_notification) {
   1543         const int kLongIdlePauseInMs = 1000;
   1544         V8::ContextDisposedNotification();
   1545         V8::IdleNotification(kLongIdlePauseInMs);
   1546       }
   1547     }
   1548   }
   1549 
   1550 #ifndef V8_SHARED
   1551   for (int i = 1; i < options.num_isolates; ++i) {
   1552     options.isolate_sources[i].WaitForThread();
   1553   }
   1554 
   1555   for (int i = 0; i < threads.length(); i++) {
   1556     i::Thread* thread = threads[i];
   1557     thread->Join();
   1558     delete thread;
   1559   }
   1560 #endif  // V8_SHARED
   1561   return 0;
   1562 }
   1563 
   1564 
   1565 #ifdef V8_SHARED
   1566 static void SetStandaloneFlagsViaCommandLine() {
   1567   int fake_argc = 2;
   1568   char **fake_argv = new char*[2];
   1569   fake_argv[0] = NULL;
   1570   fake_argv[1] = strdup("--trace-hydrogen-file=hydrogen.cfg");
   1571   fake_argv[2] = strdup("--redirect-code-traces-to=code.asm");
   1572   v8::V8::SetFlagsFromCommandLine(&fake_argc, fake_argv, false);
   1573   free(fake_argv[1]);
   1574   delete[] fake_argv;
   1575 }
   1576 #endif
   1577 
   1578 
   1579 #ifndef V8_SHARED
   1580 static void DumpHeapConstants(i::Isolate* isolate) {
   1581   i::Heap* heap = isolate->heap();
   1582 
   1583   // Dump the INSTANCE_TYPES table to the console.
   1584   printf("# List of known V8 instance types.\n");
   1585 #define DUMP_TYPE(T) printf("  %d: \"%s\",\n", i::T, #T);
   1586   printf("INSTANCE_TYPES = {\n");
   1587   INSTANCE_TYPE_LIST(DUMP_TYPE)
   1588   printf("}\n");
   1589 #undef DUMP_TYPE
   1590 
   1591   // Dump the KNOWN_MAP table to the console.
   1592   printf("\n# List of known V8 maps.\n");
   1593 #define ROOT_LIST_CASE(type, name, camel_name) \
   1594   if (n == NULL && o == heap->name()) n = #camel_name;
   1595 #define STRUCT_LIST_CASE(upper_name, camel_name, name) \
   1596   if (n == NULL && o == heap->name##_map()) n = #camel_name "Map";
   1597   i::HeapObjectIterator it(heap->map_space());
   1598   printf("KNOWN_MAPS = {\n");
   1599   for (i::Object* o = it.Next(); o != NULL; o = it.Next()) {
   1600     i::Map* m = i::Map::cast(o);
   1601     const char* n = NULL;
   1602     intptr_t p = reinterpret_cast<intptr_t>(m) & 0xfffff;
   1603     int t = m->instance_type();
   1604     ROOT_LIST(ROOT_LIST_CASE)
   1605     STRUCT_LIST(STRUCT_LIST_CASE)
   1606     if (n == NULL) continue;
   1607     printf("  0x%05" V8PRIxPTR ": (%d, \"%s\"),\n", p, t, n);
   1608   }
   1609   printf("}\n");
   1610 #undef STRUCT_LIST_CASE
   1611 #undef ROOT_LIST_CASE
   1612 
   1613   // Dump the KNOWN_OBJECTS table to the console.
   1614   printf("\n# List of known V8 objects.\n");
   1615 #define ROOT_LIST_CASE(type, name, camel_name) \
   1616   if (n == NULL && o == heap->name()) n = #camel_name;
   1617   i::OldSpaces spit(heap);
   1618   printf("KNOWN_OBJECTS = {\n");
   1619   for (i::PagedSpace* s = spit.next(); s != NULL; s = spit.next()) {
   1620     i::HeapObjectIterator it(s);
   1621     const char* sname = AllocationSpaceName(s->identity());
   1622     for (i::Object* o = it.Next(); o != NULL; o = it.Next()) {
   1623       const char* n = NULL;
   1624       intptr_t p = reinterpret_cast<intptr_t>(o) & 0xfffff;
   1625       ROOT_LIST(ROOT_LIST_CASE)
   1626       if (n == NULL) continue;
   1627       printf("  (\"%s\", 0x%05" V8PRIxPTR "): \"%s\",\n", sname, p, n);
   1628     }
   1629   }
   1630   printf("}\n");
   1631 #undef ROOT_LIST_CASE
   1632 }
   1633 #endif  // V8_SHARED
   1634 
   1635 
   1636 class ShellArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   1637  public:
   1638   virtual void* Allocate(size_t length) {
   1639     void* result = malloc(length);
   1640     memset(result, 0, length);
   1641     return result;
   1642   }
   1643   virtual void* AllocateUninitialized(size_t length) {
   1644     return malloc(length);
   1645   }
   1646   virtual void Free(void* data, size_t) { free(data); }
   1647   // TODO(dslomov): Remove when v8:2823 is fixed.
   1648   virtual void Free(void* data) {
   1649 #ifndef V8_SHARED
   1650     UNREACHABLE();
   1651 #endif
   1652   }
   1653 };
   1654 
   1655 
   1656 class MockArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   1657  public:
   1658   virtual void* Allocate(size_t) V8_OVERRIDE {
   1659     return malloc(0);
   1660   }
   1661   virtual void* AllocateUninitialized(size_t length) V8_OVERRIDE {
   1662     return malloc(0);
   1663   }
   1664   virtual void Free(void*, size_t) V8_OVERRIDE {
   1665   }
   1666 };
   1667 
   1668 
   1669 int Shell::Main(int argc, char* argv[]) {
   1670   if (!SetOptions(argc, argv)) return 1;
   1671   v8::V8::InitializeICU();
   1672 #ifndef V8_SHARED
   1673   i::FLAG_trace_hydrogen_file = "hydrogen.cfg";
   1674   i::FLAG_redirect_code_traces_to = "code.asm";
   1675 #else
   1676   SetStandaloneFlagsViaCommandLine();
   1677 #endif
   1678   ShellArrayBufferAllocator array_buffer_allocator;
   1679   MockArrayBufferAllocator mock_arraybuffer_allocator;
   1680   if (options.mock_arraybuffer_allocator) {
   1681     v8::V8::SetArrayBufferAllocator(&mock_arraybuffer_allocator);
   1682   } else {
   1683     v8::V8::SetArrayBufferAllocator(&array_buffer_allocator);
   1684   }
   1685   int result = 0;
   1686   Isolate* isolate = Isolate::GetCurrent();
   1687 #ifndef V8_SHARED
   1688   v8::ResourceConstraints constraints;
   1689   constraints.ConfigureDefaults(i::OS::TotalPhysicalMemory(),
   1690                                 i::CPU::NumberOfProcessorsOnline());
   1691   v8::SetResourceConstraints(isolate, &constraints);
   1692 #endif
   1693   DumbLineEditor dumb_line_editor(isolate);
   1694   {
   1695     Initialize(isolate);
   1696 #ifdef ENABLE_VTUNE_JIT_INTERFACE
   1697     vTune::InitializeVtuneForV8();
   1698 #endif
   1699     PerIsolateData data(isolate);
   1700     InitializeDebugger(isolate);
   1701 
   1702 #ifndef V8_SHARED
   1703     if (options.dump_heap_constants) {
   1704       DumpHeapConstants(reinterpret_cast<i::Isolate*>(isolate));
   1705       return 0;
   1706     }
   1707 #endif
   1708 
   1709     if (options.stress_opt || options.stress_deopt) {
   1710       Testing::SetStressRunType(options.stress_opt
   1711                                 ? Testing::kStressTypeOpt
   1712                                 : Testing::kStressTypeDeopt);
   1713       int stress_runs = Testing::GetStressRuns();
   1714       for (int i = 0; i < stress_runs && result == 0; i++) {
   1715         printf("============ Stress %d/%d ============\n", i + 1, stress_runs);
   1716         Testing::PrepareStressRun(i);
   1717         options.last_run = (i == stress_runs - 1);
   1718         result = RunMain(isolate, argc, argv);
   1719       }
   1720       printf("======== Full Deoptimization =======\n");
   1721       Testing::DeoptimizeAll();
   1722 #if !defined(V8_SHARED)
   1723     } else if (i::FLAG_stress_runs > 0) {
   1724       int stress_runs = i::FLAG_stress_runs;
   1725       for (int i = 0; i < stress_runs && result == 0; i++) {
   1726         printf("============ Run %d/%d ============\n", i + 1, stress_runs);
   1727         options.last_run = (i == stress_runs - 1);
   1728         result = RunMain(isolate, argc, argv);
   1729       }
   1730 #endif
   1731     } else {
   1732       result = RunMain(isolate, argc, argv);
   1733     }
   1734 
   1735 
   1736 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
   1737     // Run remote debugger if requested, but never on --test
   1738     if (i::FLAG_remote_debugger && !options.test_shell) {
   1739       InstallUtilityScript(isolate);
   1740       RunRemoteDebugger(isolate, i::FLAG_debugger_port);
   1741       return 0;
   1742     }
   1743 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
   1744 
   1745     // Run interactive shell if explicitly requested or if no script has been
   1746     // executed, but never on --test
   1747 
   1748     if (( options.interactive_shell || !options.script_executed )
   1749         && !options.test_shell ) {
   1750 #if !defined(V8_SHARED) && defined(ENABLE_DEBUGGER_SUPPORT)
   1751       if (!i::FLAG_debugger) {
   1752         InstallUtilityScript(isolate);
   1753       }
   1754 #endif  // !V8_SHARED && ENABLE_DEBUGGER_SUPPORT
   1755       RunShell(isolate);
   1756     }
   1757   }
   1758   V8::Dispose();
   1759 
   1760   OnExit();
   1761 
   1762   return result;
   1763 }
   1764 
   1765 }  // namespace v8
   1766 
   1767 
   1768 #ifndef GOOGLE3
   1769 int main(int argc, char* argv[]) {
   1770   return v8::Shell::Main(argc, argv);
   1771 }
   1772 #endif
   1773