/** @brief show the backtrace of the current point (lovely while debugging) */
void xbt_backtrace_display_current()
{
- simgrid::xbt::Backtrace bt = simgrid::xbt::backtrace();
+ simgrid::xbt::Backtrace bt = simgrid::xbt::Backtrace();
xbt_backtrace_display(bt);
}
-#if HAVE_BACKTRACE
-// For some reason, if I try to use it directly, GCC thinks I try to use xbt::backtrace.
-// I suspect that this symbol is not presented as a regular function in execinfo.h
-static int gnu_backtrace(simgrid::xbt::Backtrace& bt)
-{
- return backtrace(bt.data(), bt.size());
-}
-#endif
-
namespace simgrid {
namespace xbt {
return std::unique_ptr<char, void(*)(void*)>(xbt_strdup(name), std::free);
}
-Backtrace backtrace()
+class BacktraceImpl {
+ short refcount_ = 1;
+
+public:
+ void ref() { refcount_++; }
+ bool unref()
+ {
+ refcount_--;
+ return refcount_ == 0;
+ }
+#if HAVE_BACKTRACE
+ std::vector<void*> frames;
+#endif
+};
+
+Backtrace::Backtrace()
{
- simgrid::xbt::Backtrace res;
#if HAVE_BACKTRACE
- res.resize(15);
- int used = gnu_backtrace(res);
+ 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);
}
- res.shrink_to_fit();
+ impl_->frames.shrink_to_fit();
#endif
- return res;
+}
+Backtrace::Backtrace(const Backtrace& bt)
+{
+ impl_ = bt.impl_;
+ impl_->ref();
}
+Backtrace::~Backtrace()
+{
+ if (impl_->unref()) {
+#if HAVE_BACKTRACE
+ delete impl_;
+#endif
+ }
+}
} // namespace xbt
} // namespace simgrid
#if 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.size() == 0)
+ 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.data(), bt.size());
+ 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.size(); i++) // the first one is not interesting
- result.push_back(simgrid::xbt::string_printf("%p", bt[i]));
+ 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.size());
- for (std::size_t i = 1; i < bt.size(); i++) { // the first one is not interesting
+ 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];
/* To read the output of addr2line */
char line_func[1024];
char line_pos[1024];
- for (std::size_t i = 1; i < bt.size(); i++) { // The first one is not interesting
+ 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';
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[i]));
+ 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 */
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[i]));
+ 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]);