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      1 // Copyright 2011 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 #include "v8.h"
     29 
     30 #include "api.h"
     31 #include "execution.h"
     32 #include "messages.h"
     33 #include "spaces-inl.h"
     34 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 
     39 // If no message listeners have been registered this one is called
     40 // by default.
     41 void MessageHandler::DefaultMessageReport(Isolate* isolate,
     42                                           const MessageLocation* loc,
     43                                           Handle<Object> message_obj) {
     44   SmartArrayPointer<char> str = GetLocalizedMessage(isolate, message_obj);
     45   if (loc == NULL) {
     46     PrintF("%s\n", *str);
     47   } else {
     48     HandleScope scope(isolate);
     49     Handle<Object> data(loc->script()->name(), isolate);
     50     SmartArrayPointer<char> data_str;
     51     if (data->IsString())
     52       data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
     53     PrintF("%s:%i: %s\n", *data_str ? *data_str : "<unknown>",
     54            loc->start_pos(), *str);
     55   }
     56 }
     57 
     58 
     59 Handle<JSMessageObject> MessageHandler::MakeMessageObject(
     60     Isolate* isolate,
     61     const char* type,
     62     MessageLocation* loc,
     63     Vector< Handle<Object> > args,
     64     Handle<String> stack_trace,
     65     Handle<JSArray> stack_frames) {
     66   Factory* factory = isolate->factory();
     67   Handle<String> type_handle = factory->InternalizeUtf8String(type);
     68   Handle<FixedArray> arguments_elements =
     69       factory->NewFixedArray(args.length());
     70   for (int i = 0; i < args.length(); i++) {
     71     arguments_elements->set(i, *args[i]);
     72   }
     73   Handle<JSArray> arguments_handle =
     74       factory->NewJSArrayWithElements(arguments_elements);
     75 
     76   int start = 0;
     77   int end = 0;
     78   Handle<Object> script_handle = factory->undefined_value();
     79   if (loc) {
     80     start = loc->start_pos();
     81     end = loc->end_pos();
     82     script_handle = GetScriptWrapper(loc->script());
     83   }
     84 
     85   Handle<Object> stack_trace_handle = stack_trace.is_null()
     86       ? Handle<Object>::cast(factory->undefined_value())
     87       : Handle<Object>::cast(stack_trace);
     88 
     89   Handle<Object> stack_frames_handle = stack_frames.is_null()
     90       ? Handle<Object>::cast(factory->undefined_value())
     91       : Handle<Object>::cast(stack_frames);
     92 
     93   Handle<JSMessageObject> message =
     94       factory->NewJSMessageObject(type_handle,
     95                                   arguments_handle,
     96                                   start,
     97                                   end,
     98                                   script_handle,
     99                                   stack_trace_handle,
    100                                   stack_frames_handle);
    101 
    102   return message;
    103 }
    104 
    105 
    106 void MessageHandler::ReportMessage(Isolate* isolate,
    107                                    MessageLocation* loc,
    108                                    Handle<Object> message) {
    109   // We are calling into embedder's code which can throw exceptions.
    110   // Thus we need to save current exception state, reset it to the clean one
    111   // and ignore scheduled exceptions callbacks can throw.
    112 
    113   // We pass the exception object into the message handler callback though.
    114   Object* exception_object = isolate->heap()->undefined_value();
    115   if (isolate->has_pending_exception()) {
    116     isolate->pending_exception()->ToObject(&exception_object);
    117   }
    118   Handle<Object> exception_handle(exception_object, isolate);
    119 
    120   Isolate::ExceptionScope exception_scope(isolate);
    121   isolate->clear_pending_exception();
    122   isolate->set_external_caught_exception(false);
    123 
    124   v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
    125   v8::Local<v8::Value> api_exception_obj = v8::Utils::ToLocal(exception_handle);
    126 
    127   v8::NeanderArray global_listeners(isolate->factory()->message_listeners());
    128   int global_length = global_listeners.length();
    129   if (global_length == 0) {
    130     DefaultMessageReport(isolate, loc, message);
    131     if (isolate->has_scheduled_exception()) {
    132       isolate->clear_scheduled_exception();
    133     }
    134   } else {
    135     for (int i = 0; i < global_length; i++) {
    136       HandleScope scope(isolate);
    137       if (global_listeners.get(i)->IsUndefined()) continue;
    138       v8::NeanderObject listener(JSObject::cast(global_listeners.get(i)));
    139       Handle<Foreign> callback_obj(Foreign::cast(listener.get(0)));
    140       v8::MessageCallback callback =
    141           FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address());
    142       Handle<Object> callback_data(listener.get(1), isolate);
    143       {
    144         // Do not allow exceptions to propagate.
    145         v8::TryCatch try_catch;
    146         callback(api_message_obj, callback_data->IsUndefined()
    147                                       ? api_exception_obj
    148                                       : v8::Utils::ToLocal(callback_data));
    149       }
    150       if (isolate->has_scheduled_exception()) {
    151         isolate->clear_scheduled_exception();
    152       }
    153     }
    154   }
    155 }
    156 
    157 
    158 Handle<String> MessageHandler::GetMessage(Isolate* isolate,
    159                                           Handle<Object> data) {
    160   Factory* factory = isolate->factory();
    161   Handle<String> fmt_str =
    162       factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("FormatMessage"));
    163   Handle<JSFunction> fun =
    164       Handle<JSFunction>(
    165           JSFunction::cast(
    166               isolate->js_builtins_object()->
    167               GetPropertyNoExceptionThrown(*fmt_str)));
    168   Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data);
    169   Handle<Object> argv[] = { Handle<Object>(message->type(), isolate),
    170                             Handle<Object>(message->arguments(), isolate) };
    171 
    172   bool caught_exception;
    173   Handle<Object> result =
    174       Execution::TryCall(fun,
    175                          isolate->js_builtins_object(),
    176                          ARRAY_SIZE(argv),
    177                          argv,
    178                          &caught_exception);
    179 
    180   if (caught_exception || !result->IsString()) {
    181     return factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("<error>"));
    182   }
    183   Handle<String> result_string = Handle<String>::cast(result);
    184   // A string that has been obtained from JS code in this way is
    185   // likely to be a complicated ConsString of some sort.  We flatten it
    186   // here to improve the efficiency of converting it to a C string and
    187   // other operations that are likely to take place (see GetLocalizedMessage
    188   // for example).
    189   FlattenString(result_string);
    190   return result_string;
    191 }
    192 
    193 
    194 SmartArrayPointer<char> MessageHandler::GetLocalizedMessage(
    195     Isolate* isolate,
    196     Handle<Object> data) {
    197   HandleScope scope(isolate);
    198   return GetMessage(isolate, data)->ToCString(DISALLOW_NULLS);
    199 }
    200 
    201 
    202 } }  // namespace v8::internal
    203