- std::string cmd = stream.str();
-
- /* size (in char) of pointers on this arch */
- int addr_len = addrs[0].size();
-
- XBT_VERB("Fire a first command: '%s'", cmd.c_str());
- FILE* pipe = popen(cmd.c_str(), "r");
- xbt_assert(pipe, "Cannot fork addr2line to display the backtrace");
-
- /* To read the output of addr2line */
- char line_func[1024];
- char line_pos[1024];
- for (std::size_t i = 0; i < count; i++) {
- XBT_DEBUG("Looking for symbol %zu, addr = '%s'", i, addrs[i].c_str());
- if (fgets(line_func, 1024, pipe)) {
- line_func[strlen(line_func) - 1] = '\0';
- } else {
- XBT_VERB("Cannot run fgets to look for symbol %zu, addr %s", i, addrs[i].c_str());
- strncpy(line_func, "???", 4);
- }
- if (fgets(line_pos, 1024, pipe)) {
- line_pos[strlen(line_pos) - 1] = '\0';
- } else {
- XBT_VERB("Cannot run fgets to look for symbol %zu, addr %s", i, addrs[i].c_str());
- strncpy(line_pos, backtrace_syms[i], 1024);
- }
-
- if (strcmp("??", line_func) != 0) {
- auto name = simgrid::xbt::demangle(line_func);
- XBT_DEBUG("Found static symbol %s at %s", name.get(), line_pos);
- result.push_back(simgrid::xbt::string_printf("%s at %s, %p", name.get(), line_pos, loc[i]));
- } else {
- /* Damn. The symbol is in a dynamic library. Let's get wild */
-
- unsigned long int offset = 0;
- int found = 0;
-
- /* let's look for the offset of this library in our addressing space */
- std::string maps_name = std::string("/proc/") + std::to_string(getpid()) + "/maps";
- std::ifstream maps(maps_name);
- if (not maps) {
- XBT_CRITICAL("open(\"%s\") failed: %s", maps_name.c_str(), strerror(errno));
- continue;
- }
- size_t pos;
- unsigned long int addr = std::stoul(addrs[i], &pos, 16);
- if (pos != addrs[i].length()) {
- XBT_CRITICAL("Cannot parse backtrace address '%s' (addr=%#lx)", addrs[i].c_str(), addr);
- }
- XBT_DEBUG("addr=%s (as string) =%#lx (as number)", addrs[i].c_str(), addr);
-
- while (not found) {
- unsigned long int first;
- unsigned long int last;
-
- std::string maps_buff;
- if (not std::getline(maps, maps_buff))
- break;
- if (i == 0) {
- XBT_DEBUG("map line: %s", maps_buff.c_str());
- }
- first = std::stoul(maps_buff, &pos, 16);
- maps_buff.erase(0, pos + 1);
- last = std::stoul(maps_buff, nullptr, 16);
- if (first < addr && addr < last) {
- offset = first;
- found = 1;
- }
- if (found) {
- XBT_DEBUG("%#lx in [%#lx-%#lx]", addr, first, last);
- XBT_DEBUG("Symbol found, map lines not further displayed (even if looking for next ones)");
- }
- }
- maps.close();
- addrs[i].clear();
-
- if (not found) {
- XBT_VERB("Problem while reading the maps file. Following backtrace will be mangled.");
- XBT_DEBUG("No dynamic. Static symbol: %s", backtrace_syms[i]);
- result.push_back(simgrid::xbt::string_printf("?? (%s)", backtrace_syms[i]));
- continue;
- }
-
- /* Ok, Found the offset of the maps line containing the searched symbol.
- We now need to substract this from the address we got from backtrace.
- */
-
- addrs[i] = simgrid::xbt::string_printf("0x%0*lx", addr_len - 2, addr - offset);
- XBT_DEBUG("offset=%#lx new addr=%s", offset, addrs[i].c_str());
-
- /* Got it. We have our new address. Let's get the library path and we are set */
- std::string p(backtrace_syms[i]);
- if (p[0] == '[') {
- /* library path not displayed in the map file either... */
- snprintf(line_func, 3, "??");
- } else {
- size_t p2 = p.find_first_of("( ");
- if (p2 != std::string::npos)
- p.erase(p2);