How to see useful information (filename, line no) in stacktrace of C++ program

0# 0x000055E47D43BDC2 in Debug/myprog 1# 0x000055E47D489055 in Debug/myprog 2# 0x000055E47D567FDF in Debug/myprog 3# 0x000055E47D560CDE in Debug/myprog 4# void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) in /usr/lib/libgtest.so.1.8.1 5# testing::Test::Run() in /usr/lib/libgtest.so.1.8.1 6# testing::TestInfo::Run() in /usr/lib/libgtest.so.1.8.1 7# testing::TestCase::Run() in /usr/lib/libgtest.so.1.8.1 8# testing::internal::UnitTestImpl::RunAllTests() in /usr/lib/libgtest.so.1.8.1

Part 1

I had put together the following files (adapted from here). Since there is no execinfo.h in Windows (that I am aware of), this only works in Linux. It does not use boost, but it may be useful anyway.

backtrace_util.h:

#ifndef BACKTRACE_UTIL_H
#define BACKTRACE_UTIL_H
void backtrace_print(void);
#endif // BACKTRACE_UTIL_H

backtrace_util.cc:

#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void backtrace_print(void) {
    int j, nptrs;
#define SIZE 100
    void *buffer[100];
    char **strings;

    nptrs = backtrace(buffer, SIZE);
    printf("backtrace() returned %d addresses\n", nptrs);

    /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO)
     would produce similar output to the following: */

    strings = backtrace_symbols(buffer, nptrs);
    if (strings == NULL) {
        perror("backtrace_symbols");
        exit(EXIT_FAILURE);
    }

    for (j = 0; j < nptrs; j++)
        printf("%s\n", strings[j]);

    free(strings);
}

backtrace_test.cc:

#include <stdio.h>
#include <stdlib.h>

#include "backtrace_util.h"

void myfunc(int ncalls) {
    if (ncalls > 1)
        myfunc(ncalls - 1);
    else {
        backtrace_print();
    }
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "%s num-calls\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    myfunc(atoi(argv[1]));
    exit(EXIT_SUCCESS);
}

Compiled/linked with -std=c++17 -g, linked with -rdynamic. The output is

$ ./backtrace_test 2
backtrace() returned 6 addresses
./backtrace_test(_Z15backtrace_printv+0x2e) [0x55c51759bc51]
./backtrace_test(_Z6myfunci+0x25) [0x55c51759bbbb]
./backtrace_test(_Z6myfunci+0x1e) [0x55c51759bbb4]
./backtrace_test(main+0x5b) [0x55c51759bc19]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f3c2c2f5b97]
./backtrace_test(_start+0x2a) [0x55c51759baaa]

Part 2

When trying to demangle the names obtained, I came across this, and this. I did not follow up on putting together the whole thing.

Recommended topics

Hot tags