caller function name, its filename and line number

[Vicente Benjumea]

/*
 *  Hello, does anyone know how can a function to know what is the
 *  function name of its caller, and in which file and from what
 *  line number the call was done ???
 *  It is supossed that it is done in a transparent way, that is, the
caller
 *  does not have to do any special action.
 *  I mean by using the debugging information stored in the object file,
 *  and using GCC as the compiler/linker. The target machine should be
 *  an Intel ix86 and the host system GNU/Linux and Windows
 *
 *  Its purpose is to improve some error diagnose messages from a library
 *
 *  Thank you very much in advance
 *  Vicente
 */
//- main.cpp ------------------------------------------------------------------
#include <iostream>
#include <string>

using namespace std;

#ifdef __GNUC__
void
look_for_caller_file_and_line(const void* return_addr, const void*
frame_addr,
                              string& caller_name, string& filename, int&
line)
{
    /*
     *  It should look for the caller function name and the file name
     *  and line number where the call was done.
     *
     *  It could be done through the frame pointer, the stack and
     *  the symbol table or whatever other means.
     *
     *  It should be possible to do it, because gdb is able to do it under
     *  the backtrace command (or up command)
     */
    
}
#endif

void
check(int x)
{
    if (x > 10) {
#ifdef __GNUC__
        string caller_name;
        string filename;
        int line;
        const void* return_addr = __builtin_return_address(0);
        const void* frame_addr = __builtin_frame_address(0);
        
        look_for_caller_file_and_line(return_addr, frame_addr,
                                      caller_name, filename, line);

        cout << "Error: value out of range " << x 
             << " in " << caller_name 
             << " in " << filename
             << " at line " << line << endl;
#else
        cout << "Error: value out of range " << x << endl;
#endif
        abort();
    }
}

int
main()
{
    check(5);   // this is file main.cpp at line 65
    check(20);  // this is file main.cpp at line 66
}
//- main.cpp ------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Desired output:
//
// Error: value out of range 20 in main in main.cpp at line 66
//-----------------------------------------------------------------------------