gcc/jit/jit-logging.c

   1 /* Internals of libgccjit: logging
   2    Copyright (C) 2014-2016 Free Software Foundation, Inc.
   3    Contributed by David Malcolm <dmalcolm@redhat.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it
   8 under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "toplev.h" /* for print_version */
  25
  26 #include "jit-logging.h"
  27
  28 namespace gcc {
  29
  30 namespace jit {
  31
  32 /* Implementation of class gcc::jit::logger.  */
  33
  34 /* The constructor for gcc::jit::logger, used by
  35    gcc_jit_context_set_logfile.  */
  36
  37 logger::logger (FILE *f_out,
  38                 int, /* flags */
  39                 int /* verbosity */) :
  40   m_refcount (0),
  41   m_f_out (f_out),
  42   m_indent_level (0),
  43   m_log_refcount_changes (false)
  44 {
  45   /* Begin the log by writing the GCC version.  */
  46   print_version (f_out, "JIT:", false);
  47 }
  48
  49 /* The destructor for gcc::jit::logger, invoked via
  50    the decref method when the refcount hits zero.
  51    Note that we do not close the underlying FILE * (m_f_out).  */
  52
  53 logger::~logger ()
  54 {
  55   /* This should be the last message emitted.  */
  56   log ("%s", __PRETTY_FUNCTION__);
  57   gcc_assert (m_refcount == 0);
  58 }
  59
  60 /* Increment the reference count of the gcc::jit::logger.  */
  61
  62 void
  63 logger::incref (const char *reason)
  64 {
  65   m_refcount++;
  66   if (m_log_refcount_changes)
  67     log ("%s: reason: %s refcount now %i ",
  68          __PRETTY_FUNCTION__, reason, m_refcount);
  69 }
  70
  71 /* Decrement the reference count of the gcc::jit::logger,
  72    deleting it if nothing is referring to it.  */
  73
  74 void
  75 logger::decref (const char *reason)
  76 {
  77   gcc_assert (m_refcount > 0);
  78   --m_refcount;
  79   if (m_log_refcount_changes)
  80     log ("%s: reason: %s refcount now %i",
  81          __PRETTY_FUNCTION__, reason, m_refcount);
  82   if (0 == m_refcount)
  83     delete this;
  84 }
  85
  86 /* Write a formatted message to the log, by calling the log_va method.  */
  87
  88 void
  89 logger::log (const char *fmt, ...)
  90 {
  91   va_list ap;
  92   va_start (ap, fmt);
  93   log_va (fmt, ap);
  94   va_end (ap);
  95 }
  96
  97 /* Write an indented line to the log file.
  98
  99    We explicitly flush after each line: if something crashes the process,
 100    we want the logfile/stream to contain the most up-to-date hint about the
 101    last thing that was happening, without it being hidden in an in-process
 102    buffer.  */
 103
 104 void
 105 logger::log_va (const char *fmt, va_list ap)
 106 {
 107   fprintf (m_f_out, "JIT: ");
 108   for (int i = 0; i < m_indent_level; i++)
 109     fputc (' ', m_f_out);
 110   vfprintf (m_f_out, fmt, ap);
 111   fprintf (m_f_out, "\n");
 112   fflush (m_f_out);
 113 }
 114
 115 /* Record the entry within a particular scope, indenting subsequent
 116    log lines accordingly.  */
 117
 118 void
 119 logger::enter_scope (const char *scope_name)
 120 {
 121   log ("entering: %s", scope_name);
 122   m_indent_level += 1;
 123 }
 124
 125 /* Record the exit from a particular scope, restoring the indent level to
 126    before the scope was entered.  */
 127
 128 void
 129 logger::exit_scope (const char *scope_name)
 130 {
 131   if (m_indent_level)
 132     m_indent_level -= 1;
 133   else
 134     log ("(mismatching indentation)");
 135   log ("exiting: %s", scope_name);
 136 }
 137
 138 /* Implementation of class gcc::jit::log_user.  */
 139
 140 /* The constructor for gcc::jit::log_user.  */
 141
 142 log_user::log_user (logger *logger) : m_logger (logger)
 143 {
 144   if (m_logger)
 145     m_logger->incref("log_user ctor");
 146 }
 147
 148 /* The destructor for gcc::jit::log_user.  */
 149
 150 log_user::~log_user ()
 151 {
 152   if (m_logger)
 153     m_logger->decref("log_user dtor");
 154 }
 155
 156 /* Set the logger for a gcc::jit::log_user, managing the reference counts
 157    of the old and new logger (either of which might be NULL).  */
 158
 159 void
 160 log_user::set_logger (logger *logger)
 161 {
 162   if (logger)
 163     logger->incref ("log_user::set_logger");
 164   if (m_logger)
 165     m_logger->decref ("log_user::set_logger");
 166   m_logger = logger;
 167 }
 168
 169 } // namespace gcc::jit
 170
 171 } // namespace gcc