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/* ===================================================================== */
/*
  @ORIGINAL_AUTHOR: Robert Cohn
*/

/* ===================================================================== */
/*! @file
  Demonstrates low cost api replacement using probes. We run the original
  program, but use probes to transfer control to out replacement functions.

  Generates a trace of malloc/free calls

 */



#include "pin.H"
#include <iostream>
#include <fstream>

using namespace std;

/* ===================================================================== */
/* Global Variables */
/* ===================================================================== */

ofstream TraceFile;

/* ===================================================================== */
/* Commandline Switches */
/* ===================================================================== */

KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool",
    "o", "malloctrace.out", "specify trace file name");

/* ===================================================================== */

INT32 Usage()
{
    cerr <<
        "This pin tool collects an instruction trace for debugging\n"
        "\n";

    cerr << KNOB_BASE::StringKnobSummary();

    cerr << endl;

    return -1;
}



void * MallocProbe(int size)
{
    // Get a handle to the original malloc so we can call it
    // This handles the case when there are multiple malloc routines
    // Must be first line of routine
    typeof(malloc) * mallocWithoutReplacement  = (typeof(malloc)*)PIN_RoutineWithoutReplacement();
    
    void * ptr = mallocWithoutReplacement(size);

    TraceFile << "malloc(" << size << ") returns " << ptr << endl;
    return ptr;
}

void FreeProbe(void *p)
{
    // Must be first line of routine
    typeof(free) * freeWithoutReplacement  = (typeof(free)*)PIN_RoutineWithoutReplacement();

    freeWithoutReplacement(p);
    TraceFile << "free(" << p << ")" << endl;
}

void ExitProbe(int code)
{
    // Must be first line of routine
    typeof(exit) * exitWithoutReplacement  = (typeof(exit)*)PIN_RoutineWithoutReplacement();

    TraceFile << "## eof" << endl << flush;
    TraceFile.close();
    
    exitWithoutReplacement(code);
}


/* ===================================================================== */
// Called every time a new image is loaded
// Look for routines that we want to probe
VOID ImageLoad(IMG img, VOID *v)
{
    RTN mallocRtn = RTN_FindByName(img, "malloc");
    if (RTN_Valid(mallocRtn))
    {
        RTN_ReplaceWithUninstrumentedRoutine(mallocRtn, AFUNPTR(MallocProbe));
        TraceFile << "Inserted probe for malloc:" << IMG_Name(img) << endl;
    }
    
    RTN freeRtn = RTN_FindByName(img, "free");
    if (RTN_Valid(freeRtn))
    {
        RTN_ReplaceWithUninstrumentedRoutine(freeRtn, AFUNPTR(FreeProbe));
        TraceFile << "Inserted probe for free:" << IMG_Name(img) << endl;
    }

    RTN exitRtn = RTN_FindByName(img, "exit");
    if (RTN_Valid(exitRtn))
    {
        RTN_ReplaceWithUninstrumentedRoutine(exitRtn, AFUNPTR(ExitProbe));
        TraceFile << "Inserted probe for exit:" << IMG_Name(img) << endl;
    }
}

/* ===================================================================== */

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

    if( PIN_Init(argc,argv) )
    {
        return Usage();
    }

    TraceFile.open(KnobOutputFile.Value().c_str());
    TraceFile << hex;
    TraceFile.setf(ios::showbase);

    IMG_AddInstrumentFunction(ImageLoad, 0);
    
    PIN_StartProgramProbed();
    
    return 0;
}

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