ceph/src/boost/libs/context/example/execution_context_v2/backtrace.cpp

   1
   2 //          Copyright Oliver Kowalke 2014.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #define UNW_LOCAL_ONLY
   8
   9 #include <cstdlib>
  10 #include <iostream>
  11
  12 #include <libunwind.h>
  13
  14 #include <boost/context/all.hpp>
  15
  16 namespace ctx = boost::context;
  17
  18 void backtrace() {
  19         unw_cursor_t cursor;
  20         unw_context_t context;
  21         unw_getcontext( & context);
  22         unw_init_local( & cursor, & context);
  23         while ( 0 < unw_step( & cursor) ) {
  24                 unw_word_t offset, pc;
  25                 unw_get_reg( & cursor, UNW_REG_IP, & pc);
  26                 if ( 0 == pc) {
  27                         break;
  28                 }
  29                 std::cout << "0x" << pc << ":";
  30
  31                 char sym[256];
  32                 if ( 0 == unw_get_proc_name( & cursor, sym, sizeof( sym), & offset) ) {
  33                         std::cout << " (" << sym << "+0x" << offset << ")" << std::endl;
  34                 } else {
  35                         std::cout << " -- error: unable to obtain symbol name for this frame" << std::endl;
  36                 }
  37         }
  38 }
  39
  40 void bar() {
  41         backtrace();
  42 }
  43
  44 void foo() {
  45         bar();
  46 }
  47
  48 ctx::execution_context< void > f1( ctx::execution_context< void > && ctxm) {
  49     foo();
  50     return std::move( ctxm);
  51 }
  52
  53 int main() {
  54     ctx::execution_context< void > ctx1( f1);
  55     ctx1 = ctx1();
  56     std::cout << "main: done" << std::endl;
  57     return EXIT_SUCCESS;
  58 }