libcryfs/assert/backtrace.cpp
2015-10-05 15:46:50 +02:00

67 lines
1.9 KiB
C++

#include "backtrace.h"
#include <execinfo.h>
#include <signal.h>
#include <iostream>
#include <unistd.h>
#include <cxxabi.h>
#include <string>
#include <sstream>
using std::string;
using std::ostringstream;
//TODO Use the following? https://github.com/bombela/backward-cpp
namespace cpputils {
//TODO Refactor (for example: RAII or at least try{}finally{} instead of free())
std::string demangle(const string &mangledName) {
string result;
int status = -10;
char *demangledName = abi::__cxa_demangle(mangledName.c_str(), NULL, NULL, &status);
if (status == 0) {
result = demangledName;
} else {
result = mangledName;
}
free(demangledName);
return result;
}
std::string pretty(const string &backtraceLine) {
size_t startMangledName = backtraceLine.find('(');
size_t endMangledName = backtraceLine.find('+');
if (startMangledName == string::npos || endMangledName == string::npos) {
return backtraceLine;
}
return demangle(backtraceLine.substr(startMangledName+1, endMangledName-startMangledName-1)) + ": (" + backtraceLine.substr(0, startMangledName) + backtraceLine.substr(endMangledName);
}
string backtrace_to_string(void *array[], size_t size) {
ostringstream result;
char **ptr = backtrace_symbols(array, size);
for (size_t i = 0; i < size; ++i) {
result << pretty(ptr[i]) << "\n";
}
free(ptr);
return result.str();
}
string backtrace() {
constexpr unsigned int MAX_SIZE = 100;
void *array[MAX_SIZE];
size_t size = ::backtrace(array, MAX_SIZE);
return backtrace_to_string(array, size);
}
void sigsegv_handler(int) {
std::cerr << "Error: SIGSEGV\n" << backtrace() << std::endl;
exit(1);
}
void showBacktraceOnSigSegv() {
signal(SIGSEGV, sigsegv_handler);
}
}