#ifdef __GXX_ABI_VERSION
#include <cxxabi.h>
#endif
-#if HAVE_EXECINFO_H
-#include <execinfo.h>
-#endif
#if HAVE_BOOST_STACKTRACE
#define BOOST_STACKTRACE_USE_BACKTRACE
void xbt_backtrace_display(const simgrid::xbt::Backtrace& bt)
{
- std::vector<std::string> backtrace = simgrid::xbt::resolve_backtrace(bt);
+ std::string backtrace = simgrid::xbt::resolve_backtrace(bt);
if (backtrace.empty()) {
- fprintf(stderr, "(backtrace not set -- maybe unavailable on this architecture?)\n");
+ fprintf(stderr, "(backtrace not set -- did you install Boost.Stacktrace?)\n");
return;
}
- fprintf(stderr, "Backtrace (displayed in process %s):\n", SIMIX_process_self_get_name());
- for (std::string const& s : backtrace) {
- if (startWith(s, "xbt_backtrace_display_current"))
- continue;
-
- std::fprintf(stderr, "---> '%s'\n", s.c_str());
- if (startWith(s, "SIMIX_simcall_handle") ||
- startWith(s, "simgrid::xbt::MainFunction") /* main used with thread factory */)
- break;
- }
+ fprintf(stderr, "Backtrace (displayed in actor %s):\n", SIMIX_process_self_get_name());
+ std::fprintf(stderr, "%s\n", backtrace.c_str());
}
/** @brief show the backtrace of the current point (lovely while debugging) */
}
#if HAVE_BOOST_STACKTRACE
boost::stacktrace::stacktrace st;
-#elif HAVE_BACKTRACE
- std::vector<void*> frames;
#endif
};
#if HAVE_BOOST_STACKTRACE
impl_ = new BacktraceImpl();
impl_->st = boost::stacktrace::stacktrace();
-#elif HAVE_BACKTRACE
- impl_ = new BacktraceImpl();
- impl_->frames.resize(15);
- int used = backtrace(impl_->frames.data(), impl_->frames.size());
- if (used == 0) {
- std::fprintf(stderr, "The backtrace() function failed, which probably means that the memory is exhausted\n.");
- std::fprintf(stderr, "Bailing out now since there is nothing I can do without a decent amount of memory\n.");
- std::fprintf(stderr, "Please go fix the memleaks\n");
- std::exit(1);
- }
- impl_->frames.shrink_to_fit();
#endif
}
Backtrace::Backtrace(const Backtrace& bt)
namespace simgrid {
namespace xbt {
-/** Find the path of the binary file from the name found in argv */
-static std::string get_binary_path()
+std::string resolve_backtrace(const Backtrace& bt)
{
- struct stat stat_buf;
-
- if (xbt_binary_name == nullptr)
- return "";
-
- // We found it, we are happy:
- if (stat(xbt_binary_name, &stat_buf) == 0)
- return xbt_binary_name;
-
- // Not found, look in the PATH:
- char* path = getenv("PATH");
- if (path == nullptr)
- return "";
-
- XBT_DEBUG("Looking in the PATH: %s\n", path);
- std::vector<std::string> path_list;
- boost::split(path_list, path, boost::is_any_of(":;"));
-
- for (std::string const& path_item : path_list) {
- std::string binary_name = simgrid::xbt::string_printf("%s/%s", path_item.c_str(), xbt_binary_name);
- bool found = (stat(binary_name.c_str(), &stat_buf) == 0);
- XBT_DEBUG("Looked in the PATH for the binary. %s %s", found ? "Found" : "Not found", binary_name.c_str());
- if (found)
- return binary_name;
- }
-
- // Not found at all:
- return "";
-}
-
-std::vector<std::string> resolve_backtrace(const Backtrace& bt)
-{
- std::vector<std::string> result;
+ std::string result("");
#if HAVE_BOOST_STACKTRACE
std::stringstream ss;
ss << bt.impl_->st;
- result.push_back(ss.str());
-#elif HAVE_BACKTRACE && HAVE_EXECINFO_H && HAVE_POPEN && defined(ADDR2LINE)
- // FIXME: This code could be greatly improved/simplified with
- // http://cairo.sourcearchive.com/documentation/1.9.4/backtrace-symbols_8c-source.html
- if (bt.impl_->frames.size() == 0)
- return result;
-
- if (xbt_binary_name == nullptr)
- XBT_WARN("XBT not initialized, the backtrace will not be resolved.");
-
- char** backtrace_syms = backtrace_symbols(bt.impl_->frames.data(), bt.impl_->frames.size());
- std::string binary_name = get_binary_path();
-
- if (binary_name.empty()) {
- for (std::size_t i = 1; i < bt.impl_->frames.size(); i++) // the first one is not interesting
- result.push_back(simgrid::xbt::string_printf("%p", bt.impl_->frames[i]));
- return result;
- }
-
- // Create the system command for add2line:
- std::ostringstream stream;
- stream << ADDR2LINE << " -f -e " << binary_name << ' ';
- std::vector<std::string> addrs(bt.impl_->frames.size());
- for (std::size_t i = 1; i < bt.impl_->frames.size(); i++) { // the first one is not interesting
- /* retrieve this address */
- XBT_DEBUG("Retrieving address number %zu from '%s'", i, backtrace_syms[i]);
- char buff[256];
- snprintf(buff, 256, "%s", strchr(backtrace_syms[i], '[') + 1);
- char* p = strchr(buff, ']');
- *p = '\0';
- if (strcmp(buff, "(nil)"))
- addrs[i] = buff;
- else
- addrs[i] = "0x0";
- XBT_DEBUG("Set up a new address: %zu, '%s'", i, addrs[i].c_str());
- /* Add it to the command line args */
- stream << addrs[i] << ' ';
- }
- 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 = 1; i < bt.impl_->frames.size(); i++) { // The first one is not interesting
- 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, bt.impl_->frames[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);
-
- /* Here we go, fire an addr2line up */
- std::string subcmd = std::string(ADDR2LINE) + " -f -e " + p + " " + addrs[i];
- XBT_VERB("Fire another command: '%s'", subcmd.c_str());
- FILE* subpipe = popen(subcmd.c_str(), "r");
- if (not subpipe) {
- xbt_die("Cannot fork addr2line to display the backtrace");
- }
- if (fgets(line_func, 1024, subpipe)) {
- line_func[strlen(line_func) - 1] = '\0';
- } else {
- XBT_VERB("Cannot read result of subcommand %s", subcmd.c_str());
- strncpy(line_func, "???", 4);
- }
- if (fgets(line_pos, 1024, subpipe)) {
- line_pos[strlen(line_pos) - 1] = '\0';
- } else {
- XBT_VERB("Cannot read result of subcommand %s", subcmd.c_str());
- strncpy(line_pos, backtrace_syms[i], 1024);
- }
- pclose(subpipe);
- }
-
- /* check whether the trick worked */
- if (strcmp("??", line_func)) {
- auto name = simgrid::xbt::demangle(line_func);
- XBT_DEBUG("Found dynamic symbol %s at %s", name.get(), line_pos);
- result.push_back(simgrid::xbt::string_printf("%s at %s, %p", name.get(), line_pos, bt.impl_->frames[i]));
- } else {
- /* damn, nothing to do here. Let's print the raw address */
- XBT_DEBUG("Dynamic symbol not found. Raw address = %s", backtrace_syms[i]);
- result.push_back(simgrid::xbt::string_printf("?? at %s", backtrace_syms[i]));
- }
- }
- addrs[i].clear();
-
- /* Mask the bottom of the stack */
- const char* const breakers[] = {
- "main",
- "_ZN7simgrid6kernel7context13ThreadContext7wrapperE", // simgrid::kernel::context::ThreadContext::wrapper
- "_ZN7simgrid6kernel7context8UContext7wrapperE" // simgrid::kernel::context::UContext::wrapper
- };
- bool do_break = false;
- for (const char* b : breakers) {
- if (strncmp(b, line_func, strlen(b)) == 0) {
- do_break = true;
- break;
- }
- }
- if (do_break)
- break;
- }
- pclose(pipe);
- xbt_free(backtrace_syms);
-#endif /* ADDR2LINE usable to resolve the backtrace */
+ result.append(ss.str());
+#endif
return result;
}
