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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(const MessageLocation* loc,
     42                                           Handle<Object> message_obj) {
     43   SmartArrayPointer<char> str = GetLocalizedMessage(message_obj);
     44   if (loc == NULL) {
     45     PrintF("%s\n", *str);
     46   } else {
     47     HandleScope scope;
     48     Handle<Object> data(loc->script()->name());
     49     SmartArrayPointer<char> data_str;
     50     if (data->IsString())
     51       data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
     52     PrintF("%s:%i: %s\n", *data_str ? *data_str : "<unknown>",
     53            loc->start_pos(), *str);
     54   }
     55 }
     56 
     57 
     58 Handle<JSMessageObject> MessageHandler::MakeMessageObject(
     59     const char* type,
     60     MessageLocation* loc,
     61     Vector< Handle<Object> > args,
     62     Handle<String> stack_trace,
     63     Handle<JSArray> stack_frames) {
     64   Handle<String> type_handle = FACTORY->LookupAsciiSymbol(type);
     65   Handle<FixedArray> arguments_elements =
     66       FACTORY->NewFixedArray(args.length());
     67   for (int i = 0; i < args.length(); i++) {
     68     arguments_elements->set(i, *args[i]);
     69   }
     70   Handle<JSArray> arguments_handle =
     71       FACTORY->NewJSArrayWithElements(arguments_elements);
     72 
     73   int start = 0;
     74   int end = 0;
     75   Handle<Object> script_handle = FACTORY->undefined_value();
     76   if (loc) {
     77     start = loc->start_pos();
     78     end = loc->end_pos();
     79     script_handle = GetScriptWrapper(loc->script());
     80   }
     81 
     82   Handle<Object> stack_trace_handle = stack_trace.is_null()
     83       ? Handle<Object>::cast(FACTORY->undefined_value())
     84       : Handle<Object>::cast(stack_trace);
     85 
     86   Handle<Object> stack_frames_handle = stack_frames.is_null()
     87       ? Handle<Object>::cast(FACTORY->undefined_value())
     88       : Handle<Object>::cast(stack_frames);
     89 
     90   Handle<JSMessageObject> message =
     91       FACTORY->NewJSMessageObject(type_handle,
     92                                   arguments_handle,
     93                                   start,
     94                                   end,
     95                                   script_handle,
     96                                   stack_trace_handle,
     97                                   stack_frames_handle);
     98 
     99   return message;
    100 }
    101 
    102 
    103 void MessageHandler::ReportMessage(Isolate* isolate,
    104                                    MessageLocation* loc,
    105                                    Handle<Object> message) {
    106   // We are calling into embedder's code which can throw exceptions.
    107   // Thus we need to save current exception state, reset it to the clean one
    108   // and ignore scheduled exceptions callbacks can throw.
    109   Isolate::ExceptionScope exception_scope(isolate);
    110   isolate->clear_pending_exception();
    111   isolate->set_external_caught_exception(false);
    112 
    113   v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
    114 
    115   v8::NeanderArray global_listeners(FACTORY->message_listeners());
    116   int global_length = global_listeners.length();
    117   if (global_length == 0) {
    118     DefaultMessageReport(loc, message);
    119     if (isolate->has_scheduled_exception()) {
    120       isolate->clear_scheduled_exception();
    121     }
    122   } else {
    123     for (int i = 0; i < global_length; i++) {
    124       HandleScope scope;
    125       if (global_listeners.get(i)->IsUndefined()) continue;
    126       v8::NeanderObject listener(JSObject::cast(global_listeners.get(i)));
    127       Handle<Foreign> callback_obj(Foreign::cast(listener.get(0)));
    128       v8::MessageCallback callback =
    129           FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address());
    130       Handle<Object> callback_data(listener.get(1));
    131       {
    132         // Do not allow exceptions to propagate.
    133         v8::TryCatch try_catch;
    134         callback(api_message_obj, v8::Utils::ToLocal(callback_data));
    135       }
    136       if (isolate->has_scheduled_exception()) {
    137         isolate->clear_scheduled_exception();
    138       }
    139     }
    140   }
    141 }
    142 
    143 
    144 Handle<String> MessageHandler::GetMessage(Handle<Object> data) {
    145   Handle<String> fmt_str = FACTORY->LookupAsciiSymbol("FormatMessage");
    146   Handle<JSFunction> fun =
    147       Handle<JSFunction>(
    148           JSFunction::cast(
    149               Isolate::Current()->js_builtins_object()->
    150               GetPropertyNoExceptionThrown(*fmt_str)));
    151   Handle<Object> argv[] = { data };
    152 
    153   bool caught_exception;
    154   Handle<Object> result =
    155       Execution::TryCall(fun,
    156                          Isolate::Current()->js_builtins_object(),
    157                          ARRAY_SIZE(argv),
    158                          argv,
    159                          &caught_exception);
    160 
    161   if (caught_exception || !result->IsString()) {
    162     return FACTORY->LookupAsciiSymbol("<error>");
    163   }
    164   Handle<String> result_string = Handle<String>::cast(result);
    165   // A string that has been obtained from JS code in this way is
    166   // likely to be a complicated ConsString of some sort.  We flatten it
    167   // here to improve the efficiency of converting it to a C string and
    168   // other operations that are likely to take place (see GetLocalizedMessage
    169   // for example).
    170   FlattenString(result_string);
    171   return result_string;
    172 }
    173 
    174 
    175 SmartArrayPointer<char> MessageHandler::GetLocalizedMessage(
    176     Handle<Object> data) {
    177   HandleScope scope;
    178   return GetMessage(data)->ToCString(DISALLOW_NULLS);
    179 }
    180 
    181 
    182 } }  // namespace v8::internal
    183