c++ stack trace from unhandled exception? - c++

Question

This question has been asked before and there have been windows-specific answers but no satisfactory gcc answer. I can use set_terminate() to set a function that will be called (in place of terminate()) when an unhandled exception is thrown. I know how to use the backtrace library to generate a stack trace from a given point in the program. However, this won't help when my terminate-replacement is called since at that point the stack has been unwound.
Yet if I simply allow the program to abort(), it will produce a core-dump which contains the full stack information from the point at which the exception was thrown. So the information is there -- but is there a programmatic way to get it, for example so it can be logged, rather than having to examine a core file?

Answer 1

Edited Answer:
You can use std::set_terminate
#include <cstdlib>
#include <iostream>
#include <stdexcept>
#include <execinfo.h>
void
handler()
{
void *trace_elems[20];
int trace_elem_count(backtrace( trace_elems, 20 ));
char **stack_syms(backtrace_symbols( trace_elems, trace_elem_count ));
for ( int i = 0 ; i < trace_elem_count ; ++i )
{
std::cout << stack_syms[i] << "\n";
}
free( stack_syms );
exit(1);
}
int foo()
{
throw std::runtime_error( "hello" );
}
void bar()
{
foo();
}
void baz()
{
bar();
}
int
main()
{
std::set_terminate( handler );
baz();
}
giving this output:
samm#macmini ~> ./a.out
./a.out [0x10000d20]
/usr/lib/libstdc++.so.6 [0xf9bb8c8]
/usr/lib/libstdc++.so.6 [0xf9bb90c]
/usr/lib/libstdc++.so.6 [0xf9bbaa0]
./a.out [0x10000c18]
./a.out [0x10000c70]
./a.out [0x10000ca0]
./a.out [0x10000cdc]
/lib/libc.so.6 [0xfe4dd80]
/lib/libc.so.6 [0xfe4dfc0]
samjmill#bgqfen4 ~>
assuming you have debug symbols in your binary, you can then use addr2line to construct a prettier stack trace postmortem
samm#macmini ~> addr2line 0x10000c18
/home/samm/foo.cc:23
samm#macmini ~>
original answer is below
I've done this in the past using boost::error_info to inject the stack trace using backtrace from execinfo.h into an exception that is thrown.
typedef boost::error_info<struct tag_stack_str,std::string> stack_info;
Then when catching the exceptions, you can do
} catch ( const std::exception& e ) {
if ( std::string const *stack boost::get_error_info<stack_error_info>(e) ) {
std::cout << stack << std::endl;
}
}

Answer 2

Yet if I simply allow the program to abort(), it will produce a core-dump which contains the full stack information from the point at which the exception was thrown. So the information is there -- but is there a programmatic way to get it, for example so it can be logged, rather than having to examine a core file?
I doubt my experience would fit your needs but here it goes anyway.
I was overloading abort(): either by adding my own object file before the libc or using LD_PRELOAD. In my own version of abort() I was starting the debugger telling it to attach to the process (well, I surely know my PID) and dump the stack trace into a file (commands were passed to the debugger via command line). After debugger had finished, terminate the process with e.g. _exit(100).
That was on Linux using GDB. On Solaris I routinely employ similar trick but due to unavailability of a sane debugger I use the pstack tool: system("pstack <PID>").

Answer 3

You can use libunwind (just add -lunwind to linker parameters) (tested with clang++ 3.6):
demagle.hpp:
#pragma once
char const *
get_demangled_name(char const * const symbol) noexcept;
demangle.cpp:
#include "demangle.hpp"
#include <memory>
#include <cstdlib>
#include <cxxabi.h>
namespace
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
#pragma clang diagnostic ignored "-Wexit-time-destructors"
std::unique_ptr< char, decltype(std::free) & > demangled_name{nullptr, std::free};
#pragma clang diagnostic pop
}
char const *
get_demangled_name(char const * const symbol) noexcept
{
if (!symbol) {
return "<null>";
}
int status = -4;
demangled_name.reset(abi::__cxa_demangle(symbol, demangled_name.release(), nullptr, &status));
return ((status == 0) ? demangled_name.get() : symbol);
}
backtrace.hpp:
#pragma once
#include <ostream>
void
backtrace(std::ostream & _out) noexcept;
backtrace.cpp:
#include "backtrace.hpp"
#include <iostream>
#include <iomanip>
#include <limits>
#include <ostream>
#include <cstdint>
#define UNW_LOCAL_ONLY
#include <libunwind.h>
namespace
{
void
print_reg(std::ostream & _out, unw_word_t reg) noexcept
{
constexpr std::size_t address_width = std::numeric_limits< std::uintptr_t >::digits / 4;
_out << "0x" << std::setfill('0') << std::setw(address_width) << reg;
}
char symbol[1024];
}
void
backtrace(std::ostream & _out) noexcept
{
unw_cursor_t cursor;
unw_context_t context;
unw_getcontext(&context);
unw_init_local(&cursor, &context);
_out << std::hex << std::uppercase;
while (0 < unw_step(&cursor)) {
unw_word_t ip = 0;
unw_get_reg(&cursor, UNW_REG_IP, &ip);
if (ip == 0) {
break;
}
unw_word_t sp = 0;
unw_get_reg(&cursor, UNW_REG_SP, &sp);
print_reg(_out, ip);
_out << ": (SP:";
print_reg(_out, sp);
_out << ") ";
unw_word_t offset = 0;
if (unw_get_proc_name(&cursor, symbol, sizeof(symbol), &offset) == 0) {
_out << "(" << get_demangled_name(symbol) << " + 0x" << offset << ")\n\n";
} else {
_out << "-- error: unable to obtain symbol name for this frame\n\n";
}
}
_out << std::flush;
}
backtrace_on_terminate.hpp:
#include "demangle.hpp"
#include "backtrace.hpp"
#include <iostream>
#include <type_traits>
#include <exception>
#include <memory>
#include <typeinfo>
#include <cstdlib>
#include <cxxabi.h>
namespace
{
[[noreturn]]
void
backtrace_on_terminate() noexcept;
static_assert(std::is_same< std::terminate_handler, decltype(&backtrace_on_terminate) >{});
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
#pragma clang diagnostic ignored "-Wexit-time-destructors"
std::unique_ptr< std::remove_pointer_t< std::terminate_handler >, decltype(std::set_terminate) & > terminate_handler{std::set_terminate(backtrace_on_terminate), std::set_terminate};
#pragma clang diagnostic pop
[[noreturn]]
void
backtrace_on_terminate() noexcept
{
std::set_terminate(terminate_handler.release()); // to avoid infinite looping if any
backtrace(std::clog);
if (std::exception_ptr ep = std::current_exception()) {
try {
std::rethrow_exception(ep);
} catch (std::exception const & e) {
std::clog << "backtrace: unhandled exception std::exception:what(): " << e.what() << std::endl;
} catch (...) {
if (std::type_info * et = abi::__cxa_current_exception_type()) {
std::clog << "backtrace: unhandled exception type: " << get_demangled_name(et->name()) << std::endl;
} else {
std::clog << "backtrace: unhandled unknown exception" << std::endl;
}
}
}
std::_Exit(EXIT_FAILURE);
}
}
There is good article concerning the issue.