A MessageObject is a purely internal object to hold information about

src/objects-printer.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 133 matching lines @@
       break;
     case CODE_TYPE:
       Code::cast(this)->CodePrint(out);
       break;
     case PROXY_TYPE:
       Proxy::cast(this)->ProxyPrint(out);
       break;
     case SHARED_FUNCTION_INFO_TYPE:
       SharedFunctionInfo::cast(this)->SharedFunctionInfoPrint(out);
       break;
+    case JS_MESSAGE_OBJECT_TYPE:
+      JSMessageObject::cast(this)->JSMessageObjectPrint(out);
+      break;
     case JS_GLOBAL_PROPERTY_CELL_TYPE:
       JSGlobalPropertyCell::cast(this)->JSGlobalPropertyCellPrint(out);
       break;
 #define MAKE_STRUCT_CASE(NAME, Name, name) \
   case NAME##_TYPE:                        \
     Name::cast(this)->Name##Print(out);    \
     break;
   STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
 
@@ skipping 225 matching lines @@
     case JS_FUNCTION_TYPE: return "JS_FUNCTION";
     case CODE_TYPE: return "CODE";
     case JS_ARRAY_TYPE: return "JS_ARRAY";
     case JS_REGEXP_TYPE: return "JS_REGEXP";
     case JS_VALUE_TYPE: return "JS_VALUE";
     case JS_GLOBAL_OBJECT_TYPE: return "JS_GLOBAL_OBJECT";
     case JS_BUILTINS_OBJECT_TYPE: return "JS_BUILTINS_OBJECT";
     case JS_GLOBAL_PROXY_TYPE: return "JS_GLOBAL_PROXY";
     case PROXY_TYPE: return "PROXY";
     case LAST_STRING_TYPE: return "LAST_STRING_TYPE";
+    case JS_MESSAGE_OBJECT_TYPE: return "JS_MESSAGE_OBJECT_TYPE";
 #define MAKE_STRUCT_CASE(NAME, Name, name) case NAME##_TYPE: return #NAME;
   STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
   }
   return "UNKNOWN";
 }
 
 
 void Map::MapPrint(FILE* out) {
   HeapObject::PrintHeader(out, "Map");
@@ skipping 50 matching lines @@
   PrintF(out, "\n");
 }
 
 
 void JSValue::JSValuePrint(FILE* out) {
   HeapObject::PrintHeader(out, "ValueObject");
   value()->Print(out);
 }
 
 
+void JSMessageObject::JSMessageObjectPrint(FILE* out) {
+  HeapObject::PrintHeader(out, "JSMessageObject");
+  PrintF(out, " - type: ");
+  type()->ShortPrint(out);
+  PrintF(out, "\n - arguments: ");
+  arguments()->ShortPrint(out);
+  PrintF(out, "\n - start_position: %d", start_position());
+  PrintF(out, "\n - end_position: %d", end_position());
+  PrintF(out, "\n - script: ");
+  script()->ShortPrint(out);
+  PrintF(out, "\n - stack_trace: ");
+  stack_trace()->ShortPrint(out);
+  PrintF(out, "\n - stack_frames: ");
+  stack_frames()->ShortPrint(out);
+  PrintF(out, "\n");
+}
+
+
 void String::StringPrint(FILE* out) {
   if (StringShape(this).IsSymbol()) {
     PrintF(out, "#");
   } else if (StringShape(this).IsCons()) {
     PrintF(out, "c\"");
   } else {
     PrintF(out, "\"");
   }
 
   const char truncated_epilogue[] = "...<truncated>";
@@ skipping 291 matching lines @@
     desc.Print(out);
   }
   PrintF(out, "\n");
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal