src/base/logging.hh

   1 /*
   2  * Copyright (c) 2014, 2017 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Nathan Binkert
  41  *          Dave Greene
  42  *          Andreas Sandberg
  43  */
  44
  45 #ifndef __BASE_LOGGING_HH__
  46 #define __BASE_LOGGING_HH__
  47
  48 #include <cassert>
  49 #include <cstdlib>
  50 #include <iostream>
  51 #include <utility>
  52
  53 #include "base/compiler.hh"
  54 #include "base/cprintf.hh"
  55
  56 #if defined(__SUNPRO_CC)
  57 #define __FUNCTION__ "how to fix me?"
  58 #endif
  59
  60 class Logger
  61 {
  62   public:
  63     enum LogLevel {
  64         PANIC = 0,
  65         FATAL,
  66         WARN,
  67         INFO,
  68         HACK,
  69         NUM_LOG_LEVELS,
  70     };
  71
  72     /**
  73      * Set the active log level.
  74      *
  75      * All levels that are lower or equal to the selected log level
  76      * will be activated.
  77      *
  78      * @param ll Maximum log level to print
  79      */
  80     static void setLevel(LogLevel ll);
  81
  82     /**
  83      * Get a Logger corresponding to a specific log level
  84      *
  85      * @param ll Log level to access
  86      * @return Reference to the requested logger
  87      */
  88     static Logger &get(LogLevel ll);
  89
  90   public:
  91     Logger(std::ostream &stream, const char *prefix);
  92     virtual ~Logger() {};
  93
  94     template<typename ...Args> void
  95     print(const char *func, const char *file, int line,
  96           const char *format, const Args &...args)
  97     {
  98         if (!enabled)
  99             return;
 100
 101         if (prefix)
 102             stream << prefix << ": ";
 103         ccprintf(stream, format, args...);
 104
 105         printEpilogue(func, file, line, format);
 106     }
 107
 108     template<typename ...Args> void
 109     print(const char *func, const char *file, int line,
 110           const std::string &format, const Args &...args)
 111     {
 112         print(func, file, line, format.c_str(), args...);
 113     }
 114
 115   protected:
 116     virtual void printEpilogue(const char *func, const char *file, int line,
 117                                const char *format);
 118
 119   public:
 120     bool enabled;
 121     bool verbose;
 122
 123   protected:
 124     std::ostream &stream;
 125     const char *prefix;
 126 };
 127
 128 #define exit_message(logger, code, ...)                                 \
 129     do {                                                                \
 130         logger.print(__FUNCTION__, __FILE__, __LINE__, __VA_ARGS__);    \
 131         if (code < 0)                                                   \
 132             ::abort();                                                  \
 133         else                                                            \
 134             ::exit(code);                                               \
 135     } while (0)
 136
 137 //
 138 // This implements a cprintf based panic() function.  panic() should
 139 // be called when something happens that should never ever happen
 140 // regardless of what the user does (i.e., an acutal m5 bug).  panic()
 141 // calls abort which can dump core or enter the debugger.
 142 //
 143 //
 144 #define panic(...) exit_message(::Logger::get(::Logger::PANIC), -1, \
 145                                 __VA_ARGS__)
 146
 147 //
 148 // This implements a cprintf based fatal() function.  fatal() should
 149 // be called when the simulation cannot continue due to some condition
 150 // that is the user's fault (bad configuration, invalid arguments,
 151 // etc.) and not a simulator bug.  fatal() calls  abort() like
 152 // panic() does.
 153 //
 154 #define fatal(...) exit_message(::Logger::get(::Logger::FATAL), 1, \
 155                                 __VA_ARGS__)
 156
 157 /**
 158  * Conditional panic macro that checks the supplied condition and only panics
 159  * if the condition is true and allows the programmer to specify diagnostic
 160  * printout.  Useful to replace if + panic, or if + print + assert, etc.
 161  *
 162  * @param cond Condition that is checked; if true -> panic
 163  * @param ...  Printf-based format string with arguments, extends printout.
 164  */
 165 #define panic_if(cond, ...)                                  \
 166     do {                                                     \
 167         if ((cond)) {                                        \
 168             panic("panic condition " # cond " occurred: %s", \
 169                   csprintf(__VA_ARGS__));                    \
 170         }                                                    \
 171     } while (0)
 172
 173
 174 /**
 175  * Conditional fatal macro that checks the supplied condition and only causes a
 176  * fatal error if the condition is true and allows the programmer to specify
 177  * diagnostic printout.  Useful to replace if + fatal, or if + print + assert,
 178  * etc.
 179  *
 180  * @param cond Condition that is checked; if true -> fatal
 181  * @param ...  Printf-based format string with arguments, extends printout.
 182  */
 183 #define fatal_if(cond, ...)                                     \
 184     do {                                                        \
 185         if ((cond)) {                                           \
 186             fatal("fatal condition " # cond " occurred: %s",    \
 187                   csprintf(__VA_ARGS__));                       \
 188         }                                                       \
 189     } while (0)
 190
 191
 192 #define base_message(logger, ...)                                       \
 193     logger.print(__FUNCTION__, __FILE__, __LINE__, __VA_ARGS__)
 194
 195 // Only print the message the first time this expression is
 196 // encountered.  i.e.  This doesn't check the string itself and
 197 // prevent duplicate strings, this prevents the statement from
 198 // happening more than once. So, even if the arguments change and that
 199 // would have resulted in a different message thoes messages would be
 200 // supressed.
 201 #define base_message_once(...) do {                     \
 202         static bool once = false;                       \
 203         if (!once) {                                    \
 204             base_message(__VA_ARGS__);                  \
 205             once = true;                                \
 206         }                                               \
 207     } while (0)
 208
 209
 210 #define warn(...) \
 211     base_message(::Logger::get(::Logger::WARN), __VA_ARGS__)
 212 #define inform(...) \
 213     base_message(::Logger::get(::Logger::INFO), __VA_ARGS__)
 214 #define hack(...) \
 215     base_message(::Logger::get(::Logger::HACK), __VA_ARGS__)
 216
 217 #define warn_once(...) \
 218     base_message_once(::Logger::get(::Logger::WARN), __VA_ARGS__)
 219 #define inform_once(...) \
 220     base_message_once(::Logger::get(::Logger::INFO), __VA_ARGS__)
 221 #define hack_once(...) \
 222     base_message_once(::Logger::get(::Logger::HACK), __VA_ARGS__)
 223
 224 /**
 225  * Conditional warning macro that checks the supplied condition and
 226  * only prints a warning if the condition is true. Useful to replace
 227  * if + warn.
 228  *
 229  * @param cond Condition that is checked; if true -> warn
 230  * @param ...  Printf-based format string with arguments, extends printout.
 231  */
 232 #define warn_if(cond, ...) \
 233     do { \
 234         if ((cond)) \
 235             warn(__VA_ARGS__); \
 236     } while (0)
 237
 238 /**
 239  * The chatty assert macro will function like a normal assert, but will allow
 240  * the specification of additional, helpful material to aid debugging why the
 241  * assertion actually failed.  Like the normal assertion, the chatty_assert
 242  * will not be active in fast builds.
 243  *
 244  * @param cond Condition that is checked; if false -> assert
 245  * @param ...  Printf-based format string with arguments, extends printout.
 246  */
 247 #ifdef NDEBUG
 248 #define chatty_assert(cond, ...)
 249 #else //!NDEBUG
 250 #define chatty_assert(cond, ...)                                        \
 251     do {                                                                \
 252         if (!(cond))                                                    \
 253             panic("assert(" # cond ") failed: %s", csprintf(__VA_ARGS__)); \
 254     } while (0)
 255 #endif // NDEBUG
 256 #endif // __BASE_LOGGING_HH__