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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"
#define _STR(x) #x
#define STRINGIFY(x) _STR(x)
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) << ": " << strings[i] << std::endl;
size_t sz = 1024; // just a guess, template names will go much wider
char *function = (char *)malloc(sz);
if (!function)
return;
char *begin = 0, *end = 0;
// find the parentheses and address offset surrounding the mangled name
#ifdef __FreeBSD__
static constexpr char OPEN = '<';
#else
static constexpr char OPEN = '(';
#endif
for (char *j = strings[i]; *j; ++j) {
if (*j == OPEN)
begin = j+1;
else if (*j == '+')
end = j;
}
if (begin && end) {
int len = end - begin;
char *foo = (char *)malloc(len+1);
if (!foo) {
free(function);
return;
}
memcpy(foo, begin, len);
foo[len] = 0;
int status;
char *ret = nullptr;
// only demangle a C++ mangled name
if (foo[0] == '_' && foo[1] == 'Z')
ret = abi::__cxa_demangle(foo, function, &sz, &status);
if (ret) {
// return value may be a realloc() of the input
function = ret;
}
else {
// demangling failed, just pretend it's a C function with no args
strncpy(function, foo, sz);
strncat(function, "()", sz);
function[sz-1] = 0;
}
out << " " << (i-skip+1) << ": " << OPEN << function << end << std::endl;
//fprintf(out, " %s:%s\n", stack.strings[i], function);
free(foo);
} else {
// didn't find the mangled name, just print the whole line
out << " " << (i-skip+1) << ": " << strings[i] << std::endl;
}
free(function);
}
}
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;
size_t sz = 1024; // just a guess, template names will go much wider
char *function = (char *)malloc(sz);
if (!function)
return;
char *begin = 0, *end = 0;
// find the parentheses and address offset surrounding the mangled name
#ifdef __FreeBSD__
static constexpr char OPEN = '<';
#else
static constexpr char OPEN = '(';
#endif
for (char *j = strings[i]; *j; ++j) {
if (*j == OPEN)
begin = j+1;
else if (*j == '+')
end = j;
}
if (begin && end) {
int len = end - begin;
char *foo = (char *)malloc(len+1);
if (!foo) {
free(function);
return;
}
memcpy(foo, begin, len);
foo[len] = 0;
int status;
char *ret = nullptr;
// only demangle a C++ mangled name
if (foo[0] == '_' && foo[1] == 'Z')
ret = abi::__cxa_demangle(foo, function, &sz, &status);
if (ret) {
// return value may be a realloc() of the input
function = ret;
}
else {
// demangling failed, just pretend it's a C function with no args
strncpy(function, foo, sz);
strncat(function, "()", sz);
function[sz-1] = 0;
}
f->dump_stream("frame") << OPEN << function << end;
//fprintf(out, " %s:%s\n", stack.strings[i], function);
free(foo);
} else {
// didn't find the mangled name, just print the whole line
//out << " " << (i-skip+1) << ": " << strings[i] << std::endl;
f->dump_string("frame", strings[i]);
}
free(function);
}
f->close_section();
}
}
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