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

// The running count of instructions is kept here
UINT64 icount = 0;

// This function is called before every block
VOID docount(INT32 c) { icount += c; }
    
// Pin calls this function every time a new basic block is encountered
// It inserts a call to docount
VOID Trace(TRACE trace, VOID *v)
{
    // Visit every basic block  in the trace
    for (BBL bbl = TRACE_BblHead(trace); BBL_Valid(bbl); bbl = BBL_Next(bbl))
    {
        // Insert a call to docount for every bbl, passing the number of instructions.
        // IPOINT_ANYWHERE allows Pin to schedule the call anywhere in the bbl to obtain best performance.
        
        BBL_InsertCall(bbl, IPOINT_ANYWHERE, (AFUNPTR)docount, IARG_UINT32, BBL_NumIns(bbl), IARG_END);
    }
}

KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool",
    "o", "", "specify optional output file name");

// This function is called when the application exits
VOID Fini(INT32 code, VOID *v)
{
    ofstream OutFile;
    std::cerr << "Count " << icount << endl;
    if(KnobOutputFile.Value() != "")
    {
        OutFile.open(KnobOutputFile.Value().c_str());
        OutFile.setf(ios::showbase);
        OutFile << "Count " << icount << endl;
        OutFile.close();
    }
}

// argc, argv are the entire command line, including pin -t <toolname> -- ...
int main(int argc, char * argv[])
{
    // Initialize pin
    PIN_Init(argc, argv);

    // Register Instruction to be called to instrument instructions
    TRACE_AddInstrumentFunction(Trace, 0);

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