void print_backtrace(size_t max) {
VMException::Backtrace s = get_trace(2, max);
demangle(s);
for(size_t i = 0; i < s.size(); i++) {
std::cout << s[i] << std::endl;
}
}
static void demangle(VMException::Backtrace& s) {
for (size_t i = 0; i < s.size(); i++) {
squeeze_space(s[i]);
const char* str = s[i].c_str();
const char* pos = strstr(str, " _Z");
/* Found a mangle. */
if(pos) {
size_t sz = 1024;
char *cpp_name = 0;
char* name = strdup(pos + 1);
char* end = strstr(name, " + ");
*end = 0;
int status;
cpp_name = abi::__cxa_demangle(name, cpp_name, &sz, &status);
if(!status) {
std::string full_cpp = std::string(str, pos - str) + " " + cpp_name +
" " + (++end);
s[i] = full_cpp;
}
if(cpp_name) free(cpp_name);
free(name);
}
}
}
static void demangle(VMException::Backtrace& s) {
for (size_t i = 0; i < s.size(); i++) {
squeeze_space(s[i]);
const char* str = s[i].c_str();
const char* pos = strstr(str, " _Z");
/* Found a mangle. */
if(pos) {
size_t sz = 0;
char *cpp_name = 0;
char* name = strdup(pos + 1);
char* end = strstr(name, " + ");
*end = 0;
int status;
cpp_name = abi::__cxa_demangle(name, cpp_name, &sz, &status);
// It's possible for __cxa_demangle to return 0x0, which probably
// shouldn't happen with status == 0, but it was observed in OS X
// Mavericks Preview 2 so be paranoid.
if(cpp_name) {
if(!status) {
std::string full_cpp = std::string(str, pos - str) + " " + cpp_name +
" " + (++end);
s[i] = full_cpp;
}
free(cpp_name);
}
free(name);
}
}
}
static VMException::Backtrace get_trace(size_t skip, size_t max_depth=100) {
#ifdef USE_EXECINFO
size_t stack_depth;
char **stack_strings;
void **stack_addrs = (void **) calloc(max_depth, sizeof(void*));
stack_depth = backtrace(stack_addrs, max_depth);
stack_strings = backtrace_symbols(stack_addrs, stack_depth);
VMException::Backtrace s;
for (size_t i = skip; i < stack_depth; i++) {
s.push_back(std::string(stack_strings[i]));
}
free(stack_strings); // malloc()ed by backtrace_symbols
free(stack_addrs);
#else
VMException::Backtrace s;
s.push_back(std::string("C++ backtrace not available"));
#endif
return s;
}
