V8_Fatal now prints C++ stack trace in debug mode.

src/isolate.cc

 // Copyright 2012 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 794 matching lines @@
   StackFrameIterator it;
   for (int i = 0; !it.done(); it.Advance()) {
     it.frame()->Print(accumulator, mode, i++);
   }
 }
 
 
 void Isolate::PrintStack(StringStream* accumulator) {
   if (!IsInitialized()) {
     accumulator->Add(
-        "\n==== Stack trace is not available ==========================\n\n");
+        "\n==== JS stack trace is not available =======================\n\n");
     accumulator->Add(
         "\n==== Isolate for the thread is not initialized =============\n\n");
     return;
   }
   // The MentionedObjectCache is not GC-proof at the moment.
   AssertNoAllocation nogc;
   ASSERT(StringStream::IsMentionedObjectCacheClear());
 
   // Avoid printing anything if there are no frames.
   if (c_entry_fp(thread_local_top()) == 0) return;
 
   accumulator->Add(
-      "\n==== Stack trace ============================================\n\n");
+      "\n==== JS stack trace =========================================\n\n");
   PrintFrames(accumulator, StackFrame::OVERVIEW);
 
   accumulator->Add(
       "\n==== Details ================================================\n\n");
   PrintFrames(accumulator, StackFrame::DETAILS);
 
   accumulator->PrintMentionedObjectCache();
   accumulator->Add("=====================\n\n");
 }
 
@@ skipping 1338 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal