git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/backtrace.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached client library.
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
   6  *  All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include "mem_config.h"
  39
  40 #include "libmemcached/backtrace.hpp"
  41
  42 #include <cstdio>
  43 #include <cstdlib>
  44 #include <cstring>
  45
  46 #if defined(HAVE_SHARED_ENABLED) && HAVE_SHARED_ENABLED
  47
  48 #ifdef HAVE_EXECINFO_H
  49 #include <execinfo.h>
  50 #endif
  51
  52 #ifdef HAVE_GCC_ABI_DEMANGLE
  53 # include <cxxabi.h>
  54 # define USE_DEMANGLE 1
  55 #else
  56 # define USE_DEMANGLE 0
  57 #endif
  58
  59 #ifdef HAVE_DLFCN_H
  60 # include <dlfcn.h>
  61 #endif
  62
  63 const int MAX_DEPTH= 50;
  64
  65 void custom_backtrace(void)
  66 {
  67 #ifdef HAVE_EXECINFO_H
  68   void *backtrace_buffer[MAX_DEPTH +1];
  69
  70   int stack_frames= backtrace(backtrace_buffer, MAX_DEPTH);
  71   if (stack_frames)
  72   {
  73     char **symbollist= backtrace_symbols(backtrace_buffer, stack_frames);
  74     if (symbollist)
  75     {
  76       for (int x= 0; x < stack_frames; x++)
  77       {
  78         bool was_demangled= false;
  79
  80         if (USE_DEMANGLE)
  81         {
  82 #ifdef HAVE_DLFCN_H
  83           Dl_info dlinfo;
  84           if (dladdr(backtrace_buffer[x], &dlinfo))
  85           {
  86             char demangled_buffer[1024];
  87             const char *called_in= "<unresolved>";
  88             if (dlinfo.dli_sname)
  89             {
  90               size_t demangled_size= sizeof(demangled_buffer);
  91               int status;
  92               char* demangled;
  93               if ((demangled= abi::__cxa_demangle(dlinfo.dli_sname, demangled_buffer, &demangled_size, &status)))
  94               {
  95                 called_in= demangled;
  96                 fprintf(stderr, "---> demangled: %s -> %s\n", demangled_buffer, demangled);
  97               }
  98               else
  99               {
 100                 called_in= dlinfo.dli_sname;
 101               }
 102
 103               was_demangled= true;
 104               fprintf(stderr, "#%d  %p in %s at %s\n",
 105                       x, backtrace_buffer[x],
 106                       called_in,
 107                       dlinfo.dli_fname);
 108             }
 109           }
 110 #endif
 111         }
 112
 113         if (was_demangled == false)
 114         {
 115           fprintf(stderr, "?%d  %p in %s\n", x, backtrace_buffer[x], symbollist[x]);
 116         }
 117       }
 118
 119       ::free(symbollist);
 120     }
 121   }
 122 #endif // HAVE_EXECINFO_H
 123 }
 124
 125 #else // HAVE_SHARED_ENABLED
 126
 127 void custom_backtrace(void)
 128 {
 129   fprintf(stderr, "Backtrace null function called\n");
 130 }
 131 #endif // AX_ENABLE_BACKTRACE