gcc/analyzer/analyzer-logging.h

   1 /* Hierarchical log messages for the analyzer.
   2    Copyright (C) 2014-2022 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 /* Adapted from jit-logging.h.  */
  22
  23 #ifndef ANALYZER_LOGGING_H
  24 #define ANALYZER_LOGGING_H
  25
  26 #include "diagnostic-core.h"
  27
  28 namespace ana {
  29
  30 /* A logger encapsulates a logging stream: a way to send
  31    lines of pertinent information to a FILE *.  */
  32
  33 class logger
  34 {
  35  public:
  36   logger (FILE *f_out, int flags, int verbosity, const pretty_printer &reference_pp);
  37   ~logger ();
  38
  39   void incref (const char *reason);
  40   void decref (const char *reason);
  41
  42   void log (const char *fmt, ...)
  43     ATTRIBUTE_GCC_DIAG(2, 3);
  44   void log_va (const char *fmt, va_list *ap)
  45     ATTRIBUTE_GCC_DIAG(2, 0);
  46   void start_log_line ();
  47   void log_partial (const char *fmt, ...)
  48     ATTRIBUTE_GCC_DIAG(2, 3);
  49   void log_va_partial (const char *fmt, va_list *ap)
  50     ATTRIBUTE_GCC_DIAG(2, 0);
  51   void end_log_line ();
  52
  53   void enter_scope (const char *scope_name);
  54   void enter_scope (const char *scope_name, const char *fmt, va_list *ap)
  55     ATTRIBUTE_GCC_DIAG(3, 0);
  56   void exit_scope (const char *scope_name);
  57   void inc_indent () { m_indent_level++; }
  58   void dec_indent () { m_indent_level--; }
  59
  60   pretty_printer *get_printer () const { return m_pp; }
  61   FILE *get_file () const { return m_f_out; }
  62
  63 private:
  64   DISABLE_COPY_AND_ASSIGN (logger);
  65
  66   int m_refcount;
  67   FILE *m_f_out;
  68   int m_indent_level;
  69   bool m_log_refcount_changes;
  70   pretty_printer *m_pp;
  71 };
  72
  73 /* The class log_scope is an RAII-style class intended to make
  74    it easy to notify a logger about entering and exiting the body of a
  75    given function.  */
  76
  77 class log_scope
  78 {
  79 public:
  80   log_scope (logger *logger, const char *name);
  81   log_scope (logger *logger, const char *name, const char *fmt, ...)
  82     ATTRIBUTE_GCC_DIAG(4, 5);
  83   ~log_scope ();
  84
  85  private:
  86   DISABLE_COPY_AND_ASSIGN (log_scope);
  87
  88   logger *m_logger;
  89   const char *m_name;
  90 };
  91
  92 /* The constructor for log_scope.
  93
  94    The normal case is that the logger is NULL, in which case this should
  95    be largely a no-op.
  96
  97    If we do have a logger, notify it that we're entering the given scope.
  98    We also need to hold a reference on it, to avoid a use-after-free
  99    when logging the cleanup of the owner of the logger.  */
 100
 101 inline
 102 log_scope::log_scope (logger *logger, const char *name) :
 103  m_logger (logger),
 104  m_name (name)
 105 {
 106   if (m_logger)
 107     {
 108       m_logger->incref ("log_scope ctor");
 109       m_logger->enter_scope (m_name);
 110     }
 111 }
 112
 113 inline
 114 log_scope::log_scope (logger *logger, const char *name, const char *fmt, ...):
 115  m_logger (logger),
 116  m_name (name)
 117 {
 118   if (m_logger)
 119     {
 120       m_logger->incref ("log_scope ctor");
 121       va_list ap;
 122       va_start (ap, fmt);
 123       m_logger->enter_scope (m_name, fmt, &ap);
 124       va_end (ap);
 125     }
 126 }
 127
 128
 129 /* The destructor for log_scope; essentially the opposite of
 130    the constructor.  */
 131
 132 inline
 133 log_scope::~log_scope ()
 134 {
 135   if (m_logger)
 136     {
 137       m_logger->exit_scope (m_name);
 138       m_logger->decref ("log_scope dtor");
 139     }
 140 }
 141
 142 /* A log_user is something that potentially uses a logger (which could be NULL).
 143
 144    The log_user class keeps the reference-count of a logger up-to-date.  */
 145
 146 class log_user
 147 {
 148  public:
 149   log_user (logger *logger);
 150   ~log_user ();
 151
 152   logger * get_logger () const { return m_logger; }
 153   void set_logger (logger * logger);
 154
 155   void log (const char *fmt, ...) const
 156     ATTRIBUTE_GCC_DIAG(2, 3);
 157
 158   void start_log_line () const;
 159   void end_log_line () const;
 160
 161   void enter_scope (const char *scope_name);
 162   void exit_scope (const char *scope_name);
 163
 164   pretty_printer *get_logger_pp () const
 165   {
 166     gcc_assert (m_logger);
 167     return m_logger->get_printer ();
 168   }
 169
 170   FILE *get_logger_file () const
 171   {
 172     if (m_logger == NULL)
 173       return NULL;
 174     return m_logger->get_file ();
 175   }
 176
 177  private:
 178   DISABLE_COPY_AND_ASSIGN (log_user);
 179
 180   logger *m_logger;
 181 };
 182
 183 /* A shortcut for calling log from a log_user, handling the common
 184    case where the underlying logger is NULL via a no-op.  */
 185
 186 inline void
 187 log_user::log (const char *fmt, ...) const
 188 {
 189   if (m_logger)
 190     {
 191       va_list ap;
 192       va_start (ap, fmt);
 193       m_logger->log_va (fmt, &ap);
 194       va_end (ap);
 195     }
 196 }
 197
 198 /* A shortcut for starting a log line from a log_user,
 199    handling the common case where the underlying logger is NULL via
 200    a no-op.  */
 201
 202 inline void
 203 log_user::start_log_line () const
 204 {
 205   if (m_logger)
 206     m_logger->start_log_line ();
 207 }
 208
 209 /* A shortcut for ending a log line from a log_user,
 210    handling the common case where the underlying logger is NULL via
 211    a no-op.  */
 212
 213 inline void
 214 log_user::end_log_line () const
 215 {
 216   if (m_logger)
 217     m_logger->end_log_line ();
 218 }
 219
 220 /* A shortcut for recording entry into a scope from a log_user,
 221    handling the common case where the underlying logger is NULL via
 222    a no-op.  */
 223
 224 inline void
 225 log_user::enter_scope (const char *scope_name)
 226 {
 227   if (m_logger)
 228     m_logger->enter_scope (scope_name);
 229 }
 230
 231 /* A shortcut for recording exit from a scope from a log_user,
 232    handling the common case where the underlying logger is NULL via
 233    a no-op.  */
 234
 235 inline void
 236 log_user::exit_scope (const char *scope_name)
 237 {
 238   if (m_logger)
 239     m_logger->exit_scope (scope_name);
 240 }
 241
 242 /* If the given logger is non-NULL, log entry/exit of this scope to
 243    it, identifying it using __PRETTY_FUNCTION__.  */
 244
 245 #define LOG_SCOPE(LOGGER)               \
 246   log_scope s (LOGGER, __PRETTY_FUNCTION__)
 247
 248 /* If the given logger is non-NULL, log entry/exit of this scope to
 249    it, identifying it using __func__.  */
 250
 251 #define LOG_FUNC(LOGGER) \
 252   log_scope s (LOGGER, __func__)
 253
 254 #define LOG_FUNC_1(LOGGER, FMT, A0)     \
 255   log_scope s (LOGGER, __func__, FMT, A0)
 256
 257 #define LOG_FUNC_2(LOGGER, FMT, A0, A1)         \
 258   log_scope s (LOGGER, __func__, FMT, A0, A1)
 259
 260 #define LOG_FUNC_3(LOGGER, FMT, A0, A1, A2)     \
 261   log_scope s (LOGGER, __func__, FMT, A0, A1, A2)
 262
 263 #define LOG_FUNC_4(LOGGER, FMT, A0, A1, A2, A3) \
 264   log_scope s (LOGGER, __func__, FMT, A0, A1, A2, A3)
 265
 266 } // namespace ana
 267
 268 #endif /* ANALYZER_LOGGING_H */