/*
 * Copyright 2002-2019 Intel Corporation.
 * 
 * This software is provided to you as Sample Source Code as defined in the accompanying
 * End User License Agreement for the Intel(R) Software Development Products ("Agreement")
 * section 1.L.
 * 
 * This software and the related documents are provided as is, with no express or implied
 * warranties, other than those that are expressly stated in the License.
 */



/* ===================================================================== */
/*! @file
  Replace an original function with a custom function defined in the tool. The
  new function can have either the same or different signature from that of its
  original function.
*/

/* ===================================================================== */
#include "pin.H"
#include <iostream>
#include <stdlib.h>
using std::cout;
using std::hex;
using std::endl;
using std::dec;

/* ===================================================================== */
static void (*pf_bar)();

/* ===================================================================== */
VOID Boo(  CONTEXT * ctxt, AFUNPTR pf_Blue )
{
    cout << "Jitting Blue() with no arguments; application address: " << hex <<
        (unsigned long)pf_Blue << dec << endl;

    PIN_CallApplicationFunction( ctxt, PIN_ThreadId(), CALLINGSTD_DEFAULT,
                                 pf_Blue, NULL, PIN_PARG_END() );
    
    cout << "Returned from Blue(); Native execution. " << endl;
}


/* ===================================================================== */
VOID ImageLoad(IMG img, VOID *v)
{
    if ( IMG_IsMainExecutable( img ))
    {
        PROTO proto = PROTO_Allocate( PIN_PARG(void), CALLINGSTD_DEFAULT,
                                      "Bar", PIN_PARG_END() );
        VOID * pf_Blue;
        
        RTN rtn1 = RTN_FindByName(img, "Blue");
        if (RTN_Valid(rtn1))
            pf_Blue = reinterpret_cast<VOID *>(RTN_Address(rtn1));
        else
        {
            cout << "Blue1 cannot be found." << endl;
            exit(1);
        }
        
        RTN rtn = RTN_FindByName(img, "Bar");
        if (RTN_Valid(rtn))
        {
            cout << "Replacing " << RTN_Name(rtn) << " in " << IMG_Name(img) << endl;
            
            pf_bar = (void (*)())RTN_ReplaceSignature(
                rtn, AFUNPTR(Boo),
                IARG_PROTOTYPE, proto,
                IARG_CONTEXT,
                IARG_PTR, pf_Blue,
                IARG_END);
            
        }    
        PROTO_Free( proto );
    }
}

/* ===================================================================== */
int main(INT32 argc, CHAR *argv[])
{
    PIN_InitSymbols();

    PIN_Init(argc, argv);

    IMG_AddInstrumentFunction(ImageLoad, 0);
    
    PIN_StartProgram();

    return 0;
}

/* ===================================================================== */
/* eof */
/* ===================================================================== */