src/gallium/auxiliary/util/u_debug_stack.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * Stack backtracing.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #include "u_debug.h"
  36 #include "u_debug_stack.h"
  37
  38
  39 void
  40 debug_backtrace_capture(struct debug_stack_frame *backtrace,
  41                         unsigned start_frame,
  42                         unsigned nr_frames)
  43 {
  44    const void **frame_pointer = NULL;
  45    unsigned i = 0;
  46
  47    if(!nr_frames)
  48       return;
  49
  50 #if defined(PIPE_CC_GCC)
  51    frame_pointer = ((const void **)__builtin_frame_address(1));
  52 #elif defined(PIPE_CC_MSVC)
  53    __asm {
  54       mov frame_pointer, ebp
  55    }
  56    frame_pointer = (const void **)frame_pointer[0];
  57 #else
  58    frame_pointer = NULL;
  59 #endif
  60
  61
  62 #ifdef PIPE_ARCH_X86
  63    while(nr_frames) {
  64       if(!frame_pointer)
  65          break;
  66
  67       if(start_frame)
  68          --start_frame;
  69       else {
  70          backtrace[i++].function = frame_pointer[1];
  71          --nr_frames;
  72       }
  73
  74       frame_pointer = (const void **)frame_pointer[0];
  75    }
  76 #endif
  77
  78    while(nr_frames) {
  79       backtrace[i++].function = NULL;
  80       --nr_frames;
  81    }
  82 }
  83
  84
  85 void
  86 debug_backtrace_dump(const struct debug_stack_frame *backtrace,
  87                      unsigned nr_frames)
  88 {
  89    unsigned i;
  90
  91    for(i = 0; i < nr_frames; ++i) {
  92       if(!backtrace[i].function)
  93          break;
  94       debug_printf("\t%p\n", backtrace[i].function);
  95    }
  96 }
  97