log: add %p option to --logfile, expands to pid

src/log-utils.cc

 // Copyright 2009 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 89 matching lines @@
         AddIsolateIdIfNeeded(&stream);
         for (const char* p = FLAG_logfile; *p; p++) {
           if (*p == '%') {
             p++;
             switch (*p) {
               case '\0':
                 // If there's a % at the end of the string we back up
                 // one character so we can escape the loop properly.
                 p--;
                 break;
+              case 'p':
+                stream.Add("%d", OS::GetCurrentProcessId());
+                break;
               case 't': {
                 // %t expands to the current time in milliseconds.
                 double time = OS::TimeCurrentMillis();
                 stream.Add("%.0f", FmtElm(time));
                 break;
               }
               case '%':
                 // %% expands (contracts really) to %.
                 stream.Put('%');
                 break;
@@ skipping 183 matching lines @@
   ASSERT(pos_ <= Log::kMessageBufferSize);
   const int written = log_->WriteToFile(log_->message_buffer_, pos_);
   if (written != pos_) {
     log_->stop();
     log_->logger_->LogFailure();
   }
 }
 
 
 } }  // namespace v8::internal