Assertion failure when using --log-regexp

src/log.cc

 // Copyright 2011 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/log.h"
 
 #include <cstdarg>
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 935 matching lines @@
 
 
 // Instantiate template methods.
 #define V(TimerName, expose)                                           \
   template void TimerEventScope<TimerEvent##TimerName>::LogTimerEvent( \
       Logger::StartEnd se);
 TIMER_EVENTS_LIST(V)
 #undef V
 
 
-void Logger::LogRegExpSource(Handle<JSRegExp> regexp) {
+void Logger::LogRegExpSource(Handle<JSRegExp> regexp,
+                             Log::MessageBuilder& msg) {
   // Prints "/" + re.source + "/" +
   //      (re.global?"g":"") + (re.ignorecase?"i":"") + (re.multiline?"m":"")
-  Log::MessageBuilder msg(log_);
 
   Handle<Object> source = Object::GetProperty(
       isolate_, regexp, "source").ToHandleChecked();
   if (!source->IsString()) {
     msg.Append("no source");
     return;
   }
 
   switch (regexp->TypeTag()) {
     case JSRegExp::ATOM:
@@ skipping 17 matching lines @@
       isolate_, regexp, "ignoreCase").ToHandleChecked();
   if (ignorecase->IsTrue()) {
     msg.Append('i');
   }
   // multiline flag
   Handle<Object> multiline = Object::GetProperty(
       isolate_, regexp, "multiline").ToHandleChecked();
   if (multiline->IsTrue()) {
     msg.Append('m');
   }
-
-  msg.WriteToLogFile();
 }
 
 
 void Logger::RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache) {
   if (!log_->IsEnabled() || !FLAG_log_regexp) return;
   Log::MessageBuilder msg(log_);
   msg.Append("regexp-compile,");
-  LogRegExpSource(regexp);
+  LogRegExpSource(regexp, msg);
   msg.Append(in_cache ? ",hit" : ",miss");
   msg.WriteToLogFile();
 }
 
 
 void Logger::ApiNamedPropertyAccess(const char* tag,
                                     JSObject* holder,
                                     Object* name) {
   DCHECK(name->IsName());
   if (!log_->IsEnabled() || !FLAG_log_api) return;
@@ skipping 878 matching lines @@
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 }  // namespace internal
 }  // namespace v8