third_party/tcmalloc/chromium/src/internal_logging.h

   1 // Copyright (c) 2005, Google Inc.
   2 // All rights reserved.
   3 //
   4 // Redistribution and use in source and binary forms, with or without
   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright
   9 // notice, this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above
  11 // copyright notice, this list of conditions and the following disclaimer
  12 // in the documentation and/or other materials provided with the
  13 // distribution.
  14 //     * Neither the name of Google Inc. nor the names of its
  15 // contributors may be used to endorse or promote products derived from
  16 // this software without specific prior written permission.
  17 //
  18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 // ---
  31 // Author: Sanjay Ghemawat <opensource@google.com>
  32 //
  33 // Internal logging and related utility routines.
  34
  35 #ifndef TCMALLOC_INTERNAL_LOGGING_H_
  36 #define TCMALLOC_INTERNAL_LOGGING_H_
  37
  38 #include <config.h>
  39 #include <stddef.h>                     // for size_t
  40 #if defined HAVE_STDINT_H
  41 #include <stdint.h>
  42 #elif defined HAVE_INTTYPES_H
  43 #include <inttypes.h>
  44 #else
  45 #include <sys/types.h>
  46 #endif
  47
  48 //-------------------------------------------------------------------
  49 // Utility routines
  50 //-------------------------------------------------------------------
  51
  52 // Safe logging helper: we write directly to the stderr file
  53 // descriptor and avoid FILE buffering because that may invoke
  54 // malloc().
  55 //
  56 // Example:
  57 //   Log(kLog, __FILE__, __LINE__, "error", bytes);
  58
  59 namespace tcmalloc {
  60 enum LogMode {
  61   kLog,                       // Just print the message
  62   kCrash,                     // Print the message and crash
  63   kCrashWithStats             // Print the message, some stats, and crash
  64 };
  65
  66 class Logger;
  67
  68 // A LogItem holds any of the argument types that can be passed to Log()
  69 class LogItem {
  70  public:
  71   LogItem()                     : tag_(kEnd)      { }
  72   LogItem(const char* v)        : tag_(kStr)      { u_.str = v; }
  73   LogItem(int v)                : tag_(kSigned)   { u_.snum = v; }
  74   LogItem(long v)               : tag_(kSigned)   { u_.snum = v; }
  75   LogItem(long long v)          : tag_(kSigned)   { u_.snum = v; }
  76   LogItem(unsigned int v)       : tag_(kUnsigned) { u_.unum = v; }
  77   LogItem(unsigned long v)      : tag_(kUnsigned) { u_.unum = v; }
  78   LogItem(unsigned long long v) : tag_(kUnsigned) { u_.unum = v; }
  79   LogItem(const void* v)        : tag_(kPtr)      { u_.ptr = v; }
  80  private:
  81   friend class Logger;
  82   enum Tag {
  83     kStr,
  84     kSigned,
  85     kUnsigned,
  86     kPtr,
  87     kEnd
  88   };
  89   Tag tag_;
  90   union {
  91     const char* str;
  92     const void* ptr;
  93     int64_t snum;
  94     uint64_t unum;
  95   } u_;
  96 };
  97
  98 extern PERFTOOLS_DLL_DECL void Log(LogMode mode, const char* filename, int line,
  99                 LogItem a, LogItem b = LogItem(),
 100                 LogItem c = LogItem(), LogItem d = LogItem());
 101
 102 // Tests can override this function to collect logging messages.
 103 extern PERFTOOLS_DLL_DECL void (*log_message_writer)(const char* msg, int length);
 104
 105 }  // end tcmalloc namespace
 106
 107 // Like assert(), but executed even in NDEBUG mode
 108 #undef CHECK_CONDITION
 109 #define CHECK_CONDITION(cond)                                            \
 110 do {                                                                     \
 111   if (!(cond)) {                                                         \
 112     ::tcmalloc::Log(::tcmalloc::kCrash, __FILE__, __LINE__, #cond);      \
 113   }                                                                      \
 114 } while (0)
 115
 116 #define CHECK_CONDITION_PRINT(cond, str)                                 \
 117 do {                                                                     \
 118   if (!(cond)) {                                                         \
 119     ::tcmalloc::Log(::tcmalloc::kCrash, __FILE__, __LINE__, str);        \
 120   }                                                                      \
 121 } while (0)
 122
 123 // Our own version of assert() so we can avoid hanging by trying to do
 124 // all kinds of goofy printing while holding the malloc lock.
 125 #ifndef NDEBUG
 126 #define ASSERT(cond) CHECK_CONDITION(cond)
 127 #define ASSERT_PRINT(cond, str) CHECK_CONDITION_PRINT(cond, str)
 128 #else
 129 #define ASSERT(cond) ((void) 0)
 130 #define ASSERT_PRINT(cond, str) ((void) 0)
 131 #endif
 132
 133 // Print into buffer
 134 class TCMalloc_Printer {
 135  private:
 136   char* buf_;           // Where should we write next
 137   int   left_;          // Space left in buffer (including space for \0)
 138
 139  public:
 140   // REQUIRES: "length > 0"
 141   TCMalloc_Printer(char* buf, int length) : buf_(buf), left_(length) {
 142     buf[0] = '\0';
 143   }
 144
 145   void printf(const char* format, ...)
 146 #ifdef HAVE___ATTRIBUTE__
 147     __attribute__ ((__format__ (__printf__, 2, 3)))
 148 #endif
 149 ;
 150 };
 151
 152 #endif  // TCMALLOC_INTERNAL_LOGGING_H_