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1 /* Internals of libgccjit: logging
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2 Copyright (C) 2014-2020 Free Software Foundation, Inc.
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3 Contributed by David Malcolm <dmalcolm@redhat.com>.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "toplev.h" /* for print_version */
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25
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26 #include "jit-logging.h"
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27
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28 namespace gcc {
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29
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30 namespace jit {
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31
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32 /* Implementation of class gcc::jit::logger. */
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33
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34 /* The constructor for gcc::jit::logger, used by
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35 gcc_jit_context_set_logfile. */
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36
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37 logger::logger (FILE *f_out,
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38 int, /* flags */
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39 int /* verbosity */) :
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40 m_refcount (0),
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41 m_f_out (f_out),
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42 m_indent_level (0),
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43 m_log_refcount_changes (false)
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44 {
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45 /* Begin the log by writing the GCC version. */
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46 print_version (f_out, "JIT:", false);
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47 }
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48
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49 /* The destructor for gcc::jit::logger, invoked via
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50 the decref method when the refcount hits zero.
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51 Note that we do not close the underlying FILE * (m_f_out). */
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52
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53 logger::~logger ()
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54 {
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55 /* This should be the last message emitted. */
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56 log ("%s", __PRETTY_FUNCTION__);
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57 gcc_assert (m_refcount == 0);
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58 }
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59
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60 /* Increment the reference count of the gcc::jit::logger. */
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61
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62 void
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63 logger::incref (const char *reason)
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64 {
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65 m_refcount++;
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66 if (m_log_refcount_changes)
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67 log ("%s: reason: %s refcount now %i ",
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68 __PRETTY_FUNCTION__, reason, m_refcount);
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69 }
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70
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71 /* Decrement the reference count of the gcc::jit::logger,
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72 deleting it if nothing is referring to it. */
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73
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74 void
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75 logger::decref (const char *reason)
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76 {
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77 gcc_assert (m_refcount > 0);
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78 --m_refcount;
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79 if (m_log_refcount_changes)
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80 log ("%s: reason: %s refcount now %i",
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81 __PRETTY_FUNCTION__, reason, m_refcount);
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82 if (m_refcount == 0)
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83 delete this;
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84 }
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85
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86 /* Write a formatted message to the log, by calling the log_va method. */
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87
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88 void
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89 logger::log (const char *fmt, ...)
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90 {
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91 va_list ap;
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92 va_start (ap, fmt);
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93 log_va (fmt, ap);
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94 va_end (ap);
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95 }
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96
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97 /* Write an indented line to the log file.
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98
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99 We explicitly flush after each line: if something crashes the process,
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100 we want the logfile/stream to contain the most up-to-date hint about the
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101 last thing that was happening, without it being hidden in an in-process
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102 buffer. */
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103
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104 void
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105 logger::log_va (const char *fmt, va_list ap)
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106 {
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107 fprintf (m_f_out, "JIT: ");
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108 for (int i = 0; i < m_indent_level; i++)
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109 fputc (' ', m_f_out);
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110 vfprintf (m_f_out, fmt, ap);
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111 fprintf (m_f_out, "\n");
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112 fflush (m_f_out);
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113 }
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114
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115 /* Record the entry within a particular scope, indenting subsequent
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116 log lines accordingly. */
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117
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118 void
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119 logger::enter_scope (const char *scope_name)
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120 {
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121 log ("entering: %s", scope_name);
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122 m_indent_level += 1;
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123 }
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124
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125 /* Record the exit from a particular scope, restoring the indent level to
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126 before the scope was entered. */
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127
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128 void
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129 logger::exit_scope (const char *scope_name)
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130 {
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131 if (m_indent_level)
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132 m_indent_level -= 1;
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133 else
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134 log ("(mismatching indentation)");
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135 log ("exiting: %s", scope_name);
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136 }
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137
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138 /* Implementation of class gcc::jit::log_user. */
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139
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140 /* The constructor for gcc::jit::log_user. */
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141
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142 log_user::log_user (logger *logger) : m_logger (logger)
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143 {
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144 if (m_logger)
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145 m_logger->incref("log_user ctor");
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146 }
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147
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148 /* The destructor for gcc::jit::log_user. */
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149
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150 log_user::~log_user ()
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151 {
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152 if (m_logger)
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153 m_logger->decref("log_user dtor");
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154 }
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155
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156 /* Set the logger for a gcc::jit::log_user, managing the reference counts
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157 of the old and new logger (either of which might be NULL). */
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158
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159 void
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160 log_user::set_logger (logger *logger)
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161 {
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162 if (logger)
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163 logger->incref ("log_user::set_logger");
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164 if (m_logger)
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165 m_logger->decref ("log_user::set_logger");
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166 m_logger = logger;
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167 }
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168
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169 } // namespace gcc::jit
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170
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171 } // namespace gcc
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