In the below mentioned code I want the output to be in the decreasing order of the calls

Question

In the code I"m trying to get the output in the decreasing order of calls. Can someone please help?

#include <fstream>
#include <iomanip>
#include <iostream>
#include <string.h>
#include "pin.H"
using std::ofstream;
using std::string;
using std::hex;
using std::setw;
using std::cerr;
using std::dec;
using std::endl;

ofstream outFile;

// Holds instruction count for a single procedure

typedef struct RtnCount

{

    string _name;
    string _image;
    ADDRINT _address;
    RTN _rtn;
    UINT64 _rtnCount;
    UINT64 _icount;
    struct RtnCount * _next;
} RTN_COUNT;

// Linked list of instruction counts for each routine

RTN_COUNT * RtnList = 0;

// This function is called before every instruction is executed

VOID docount(UINT64 * counter)
{
    (*counter)++;
}
    
const char * StripPath(const char * path)
{
    const char * file = strrchr(path,'/');
    if (file)
        return file+1;
    else
        return path;
}

// Pin calls this function every time a new rtn is executed

VOID Routine(RTN rtn, VOID *v)
{

// Allocate a counter for this routine

    RTN_COUNT * rc = new RTN_COUNT;

    // The RTN goes away when the image is unloaded, so save it now
    // because we need it in the fini
    rc->_name = RTN_Name(rtn);
    rc->_image = StripPath(IMG_Name(SEC_Img(RTN_Sec(rtn))).c_str());
    rc->_address = RTN_Address(rtn);
    rc->_icount = 0;
    rc->_rtnCount = 0;

    // Add to list of routines
    rc->_next = RtnList;
    RtnList = rc;
            
    RTN_Open(rtn);

// Insert a call at the entry point of a routine to increment the call count

    RTN_InsertCall(rtn, IPOINT_BEFORE, (AFUNPTR)docount, IARG_PTR, &(rc->_rtnCount), IARG_END);

// For each instruction of the routine

    for (INS ins = RTN_InsHead(rtn); INS_Valid(ins); ins = INS_Next(ins))
    {
        // Insert a call to docount to increment the instruction counter for this rtn
        INS_InsertCall(ins, IPOINT_BEFORE, (AFUNPTR)docount, IARG_PTR, &(rc->_icount), IARG_END);
    }

    
    RTN_Close(rtn);
}

// This function is called when the application exits
// It prints the name and count for each procedure
VOID Fini(INT32 code, VOID *v)
{
    outFile << setw(23) << "Procedure" << " "
          << setw(15) << "Image" << " "
          << setw(18) << "Address" << " "
          << setw(12) << "Calls" << " "
          << setw(12) << "Instructions" << endl;

    for (RTN_COUNT * rc = RtnList; rc; rc = rc->_next)
    {
        if (rc->_icount > 0)
            outFile << setw(23) << rc->_name << " "
                  << setw(15) << rc->_image << " "
                  << setw(18) << hex << rc->_address << dec <<" "
                  << setw(12) << rc->_rtnCount << " "
                  << setw(12) << rc->_icount << endl;
    }

}

/* ===================================================================== */
/* Print Help Message                                                    */
/* ===================================================================== */

INT32 Usage()
{
    cerr << "This Pintool counts the number of times a routine is executed" << endl;
    cerr << "and the number of instructions executed in a routine" << endl;
    cerr << endl << KNOB_BASE::StringKnobSummary() << endl;
    return -1;
}

/* ===================================================================== */
/* Main                                                                  */
/* ===================================================================== */

int main(int argc, char * argv[])
{
    // Initialize symbol table code, needed for rtn instrumentation
    PIN_InitSymbols();

    outFile.open("proccount.out");

    // Initialize pin
    if (PIN_Init(argc, argv)) return Usage();

    // Register Routine to be called to instrument rtn
    RTN_AddInstrumentFunction(Routine, 0);

    // Register Fini to be called when the application exits
    PIN_AddFiniFunction(Fini, 0);
    
    // Start the program, never returns
    PIN_StartProgram();
    
    return 0;
}

I'm trying to figure it out, but I'm unable find the solution for it.

I'm getting the output in the following way.

  Procedure           Image            Address        Calls Instructions
         __memcpy_ssse3       libc.so.6       7f9b5b09ebb0          675         8100
         __strcmp_sse42       libc.so.6       7f9b5b090e20           16          784
_dl_mcount_wrapper_check       libc.so.6       7f9b5b08f730          128          512
               _dl_addr       libc.so.6       7f9b5b08f340            1        56541
    __unregister_atfork       libc.so.6       7f9b5b05e930            3           21
               wctype_l       libc.so.6       7f9b5b054a20            9          876
            __init_misc       libc.so.6       7f9b5b0507f0            1           24
                   sbrk       libc.so.6       7f9b5b047250            2           52
                    brk       libc.so.6       7f9b5b0471e0            3           39
       __close_nocancel       libc.so.6       7f9b5b042049            2           10
       __write_nocancel       libc.so.6       7f9b5b0419f9            1            5
                __write       libc.so.6       7f9b5b0419f0            1            2

I want the output in the decreasing order of calls.