sal/osl/unx/backtrace_bsd.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 // This file is #include from backtrace.c
  21
  22 #include <dlfcn.h>
  23 #include <pthread.h>
  24 #include <setjmp.h>
  25 #include <stddef.h>
  26 #include <stdio.h>
  27
  28 /* no frame.h on FreeBSD */
  29 struct frame {
  30     struct frame *fr_savfp;
  31     long    fr_savpc;
  32 };
  33
  34 #if defined(POWERPC) || defined(POWERPC64)
  35
  36 #define FRAME_PTR_OFFSET 1
  37 #define FRAME_OFFSET     0
  38
  39 #else
  40
  41 #define FRAME_PTR_OFFSET 3
  42 #define FRAME_OFFSET 0
  43
  44 #endif
  45
  46 int backtrace( void **buffer, int max_frames )
  47 {
  48     struct frame *fp;
  49     jmp_buf ctx;
  50     int i;
  51     /* get stack- and framepointer */
  52     setjmp(ctx);
  53     fp = (struct frame*)(((size_t*)(ctx))[FRAME_PTR_OFFSET]);
  54     for ( i=0; (i<FRAME_OFFSET) && (fp!=0); i++)
  55         fp = fp->fr_savfp;
  56     /* iterate through backtrace */
  57     for (i=0; fp && fp->fr_savpc && i<max_frames; i++)
  58     {
  59         /* store frame */
  60         *(buffer++) = (void *)fp->fr_savpc;
  61         /* next frame */
  62         fp=fp->fr_savfp;
  63     }
  64     return i;
  65 }
  66
  67 char ** backtrace_symbols(void * const * buffer, int size)
  68 {
  69     (void)buffer; (void)size;
  70     return NULL; /*TODO*/
  71 }
  72
  73 void backtrace_symbols_fd( void **buffer, int size, int fd )
  74 {
  75     FILE    *fp = fdopen( fd, "w" );
  76
  77     if ( fp )
  78     {
  79         void **pFramePtr;
  80         for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
  81         {
  82             Dl_info     dli;
  83             ptrdiff_t   offset;
  84
  85             if ( 0 != dladdr( *pFramePtr, &dli ) )
  86             {
  87                 if ( dli.dli_fname && dli.dli_fbase )
  88                 {
  89                     offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
  90                     fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
  91                 }
  92                 if ( dli.dli_sname && dli.dli_saddr )
  93                 {
  94                     offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
  95                     fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
  96                 }
  97             }
  98             fprintf( fp, "[%p]\n", *pFramePtr );
  99         }
 100         fclose( fp );
 101     }
 102 }
 103
 104
 105 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */