gdb/gdbserver/debug.c

   1 /* Debugging routines for the remote server for GDB.
   2    Copyright (C) 2014-2019 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include <chrono>
  21
  22 /* Enable miscellaneous debugging output.  The name is historical - it
  23    was originally used to debug LinuxThreads support.  */
  24 int debug_threads;
  25
  26 /* Include timestamps in debugging output.  */
  27 int debug_timestamp;
  28
  29 /* Print a debugging message.
  30    If the text begins a new line it is preceded by a timestamp.
  31    We don't get fancy with newline checking, we just check whether the
  32    previous call ended with "\n".  */
  33
  34 void
  35 debug_vprintf (const char *format, va_list ap)
  36 {
  37 #if !defined (IN_PROCESS_AGENT)
  38   /* N.B. Not thread safe, and can't be used, as is, with IPA.  */
  39   static int new_line = 1;
  40
  41   if (debug_timestamp && new_line)
  42     {
  43       using namespace std::chrono;
  44
  45       steady_clock::time_point now = steady_clock::now ();
  46       seconds s = duration_cast<seconds> (now.time_since_epoch ());
  47       microseconds us = duration_cast<microseconds> (now.time_since_epoch ()) - s;
  48
  49       fprintf (stderr, "%ld.%06ld ", (long) s.count (), (long) us.count ());
  50     }
  51 #endif
  52
  53   vfprintf (stderr, format, ap);
  54
  55 #if !defined (IN_PROCESS_AGENT)
  56   if (*format)
  57     new_line = format[strlen (format) - 1] == '\n';
  58 #endif
  59 }
  60
  61 /* Flush debugging output.
  62    This is called, for example, when starting an inferior to ensure all debug
  63    output thus far appears before any inferior output.  */
  64
  65 void
  66 debug_flush (void)
  67 {
  68   fflush (stderr);
  69 }
  70
  71 /* Notify the user that the code is entering FUNCTION_NAME.
  72    FUNCTION_NAME is the name of the calling function, or NULL if unknown.
  73
  74    This is intended to be called via the debug_enter macro.  */
  75
  76 void
  77 do_debug_enter (const char *function_name)
  78 {
  79   if (function_name != NULL)
  80     debug_printf (">>>> entering %s\n", function_name);
  81 }
  82
  83 /* Notify the user that the code is exiting FUNCTION_NAME.
  84    FUNCTION_NAME is the name of the calling function, or NULL if unknown.
  85
  86    This is intended to be called via the debug_exit macro.  */
  87
  88 void
  89 do_debug_exit (const char *function_name)
  90 {
  91   if (function_name != NULL)
  92     debug_printf ("<<<< exiting %s\n", function_name);
  93 }