Add option to print all exceptions

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1052 matching lines @@
 #endif
 }
 
 
 Object* Isolate::Throw(Object* exception, MessageLocation* location) {
   DCHECK(!has_pending_exception());
 
   HandleScope scope(this);
   Handle<Object> exception_handle(exception, this);
 
+  if (FLAG_print_all_exceptions) {
+    printf("=========================================================\n");
+    printf("Exception thrown:\n");
+    exception->Print();
+    printf("Stack Trace:\n");
+    PrintStack(stdout);
+    printf("=========================================================\n");
+  }
+
   // Determine whether a message needs to be created for the given exception
   // depending on the following criteria:
   // 1) External v8::TryCatch missing: Always create a message because any
   //    JavaScript handler for a finally-block might re-throw to top-level.
   // 2) External v8::TryCatch exists: Only create a message if the handler
   //    captures messages or is verbose (which reports despite the catch).
   // 3) ReThrow from v8::TryCatch: The message from a previous throw still
   //    exists and we preserve it instead of creating a new message.
   bool requires_message = try_catch_handler() == nullptr ||
                           try_catch_handler()->is_verbose_ ||
@@ skipping 2373 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8