dSYM introspection in C on macOS.c

#include <execinfo.h>
#include <inttypes.h>
#include <mach-o/dyld.h>
#include <mach-o/getsect.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#define POINTER "0x%016" PRIxPTR

intptr_t base_address() {
  const struct segment_command_64* text_segment = getsegbyname("__TEXT");
  return (uintptr_t)text_segment->vmaddr;
}

uintptr_t image_slide() {
  char path[1024];
  uint32_t size = sizeof(path);
  if (_NSGetExecutablePath(path, &size) != 0) return -1;
  uintptr_t result = 0;
  for (uint32_t i = 0; i < _dyld_image_count(); i++) {
    const char * name = _dyld_get_image_name(i);
    uintptr_t slide = _dyld_get_image_vmaddr_slide(i);
    if (strcmp(name, path) == 0) result = slide;
//    printf(POINTER ": %s\n", slide, name);
  }
  return result;
}

void print_backtrace() {
  int buffer_size = 10;
  void *bt[buffer_size];
  int bt_count = backtrace(bt, buffer_size);
  for (int i = 0; i < bt_count; i++) {
    uintptr_t return_address = (uintptr_t)bt[i];
    uintptr_t symbol_address = return_address - image_slide();
    printf("%d:  " POINTER " (" POINTER ") - ", i, return_address, symbol_address);
    fflush(stdout);
    backtrace_symbols_fd(bt + i, 1, fileno(stdout));
  }
}

int main() {
  printf("__TEXT: " POINTER "\n", base_address());
  print_backtrace();
  return 0;
}

// Debug info can be accessed using a dSYM like so: dwarfdump <path-to-dSYM> --lookup=<symbol_address>