CPP_tasks/Backtrace.cpp at main · BasmalaSherief/CPP_tasks · GitHub

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#include <iostream>
#include <libunwind-x86_64.h>
#include <libunwind.h>
#include <string>

using namespace std;

class Backtrace
{
    private:
        unw_context_t context; //current register context
        unw_cursor_t cursor; // traverse stack frames
        unw_word_t pc, offset;

    public:
        Backtrace(){}
        void enterFunction(const string &funcName);
        void exitFunction(const string &funcName);
        void printBacktrace();
};

//Class Functions

void Backtrace::enterFunction(const string &funcName)
{
    cout << "[ENTER] " << funcName << endl;
}

void Backtrace::exitFunction(const string &funcName)
{
    cout << "[EXIT] " << funcName << endl;
}

void Backtrace::printBacktrace()
{
    unw_getcontext(&context); //excution state
    unw_init_local(&cursor, &context); //Initailize cursor to the current frame

    cout << "Backtrace:" << endl;

    while( unw_step(&cursor) > 0 )
    {
        char fname[256];
        unw_get_reg(&cursor, UNW_REG_IP, &pc);

        if(unw_get_proc_name(&cursor, fname, sizeof(fname), &offset) == 0)
        {
            cout << fname << " " << "+ 0x" << hex << offset << "[0x" << pc << "]" << dec << endl;
        }
        else
        {
            cout << "Unknown function " << endl;
        }
    }
}

//Test Functions

void fun2();
void fun3();
void fun1()
{
    Backtrace f1bt;
    f1bt.enterFunction(__func__);
    fun2();
    f1bt.exitFunction(__func__);
}

void fun2()
{
    Backtrace f2bt;
    f2bt.enterFunction(__func__);
    fun3();
    f2bt.exitFunction(__func__);
}

void fun3()
{
    Backtrace f3bt;
    f3bt.enterFunction(__func__);
    f3bt.printBacktrace();
    f3bt.exitFunction(__func__);
}

int main()
{
    Backtrace mainbt;
    mainbt.enterFunction(__func__);
    fun1();
    mainbt.exitFunction(__func__);
    return 0;
}

/*

Compilation:
g++ -g Backtrace.cpp -lunwind -lunwind-x86_64 -o backtrace

*/