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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <ostream>
#include <cxxabi.h>
#include <string.h>
#include "BackTrace.h"
#include "common/version.h"
#include "common/Formatter.h"
namespace ceph {
void BackTrace::print(std::ostream& out) const
{
out << " " << pretty_version_to_str() << std::endl;
for (size_t i = skip; i < size; i++) {
out << " " << (i-skip+1) << ": " << demangle(strings[i]) << std::endl;
}
}
void BackTrace::dump(Formatter *f) const
{
f->open_array_section("backtrace");
for (size_t i = skip; i < size; i++) {
// out << " " << (i-skip+1) << ": " << strings[i] << std::endl;
f->dump_string("frame", demangle(strings[i]));
}
f->close_section();
}
std::string BackTrace::demangle(const char* name)
{
// find the parentheses and address offset surrounding the mangled name
#ifdef __FreeBSD__
static constexpr char OPEN = '<';
#else
static constexpr char OPEN = '(';
#endif
const char* begin = nullptr;
const char* end = nullptr;
for (const char *j = name; *j; ++j) {
if (*j == OPEN) {
begin = j + 1;
} else if (*j == '+') {
end = j;
}
}
if (begin && end && begin < end) {
std::string mangled(begin, end);
int status;
// only demangle a C++ mangled name
if (mangled.compare(0, 2, "_Z") == 0) {
// let __cxa_demangle do the malloc
char* demangled = abi::__cxa_demangle(mangled.c_str(), nullptr, nullptr, &status);
if (!status) {
std::string full_name{OPEN};
full_name += demangled;
full_name += end;
// buf could be reallocated, so free(demangled) instead
free(demangled);
return full_name;
}
// demangle failed, just pretend it's a C function with no args
}
// C function
return mangled + "()";
} else {
// didn't find the mangled name, just print the whole line
return name;
}
}
}
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