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//
//  ORIGINAL_AUTHOR: Kim Hazelwood
//
//  This tool prints out any linking activity in the code cache
//  Sample usage:
//    pin -t link_unlink -- /bin/ls  

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

using namespace std;

/* ================================================================== */
/* Global Variables                                                   */
/* ================================================================== */
int numLinks;
int numUnlinks;
ofstream TraceFile;

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

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

/* ================================================================== */
VOID InitCounters()
{
    string logFileName = KnobOutputFile.Value();
    TraceFile.open(logFileName.c_str());

    numLinks = 0;
    numUnlinks = 0;
}

/* ================================================================== */
/*
 Print details of links patched
*/
VOID WatchLinks(ADDRINT branch_pc, ADDRINT target_pc)
{
    numLinks++;
    TraceFile << "LINK #" << dec << numLinks;
    TraceFile << "\tcache pc=0x" << hex << branch_pc;
    TraceFile << " \tpatched to pc=0x" << hex << target_pc << endl;
}
/* ================================================================== */
/*
 Print details of links unpatched
*/
VOID WatchUnlinks(ADDRINT branch_pc, ADDRINT stub_pc)
{
    numUnlinks++;
    TraceFile << "UNLINK #" << dec << numUnlinks;
    TraceFile << "\tcache pc=0x" << hex << branch_pc;
    TraceFile << " \trestored to stub pc=0x" << hex << stub_pc << endl;
}

/* ================================================================== */
/*
 Print details at the end of the run
*/
VOID PrintDetailsOnExit(INT32 code, VOID *v)
{
    int traces = CODECACHE_NumTracesInCache();

    TraceFile << endl << "------------------------" << endl;
    TraceFile << dec << traces << " traces" << endl;
    TraceFile << numLinks << " links set in the code cache" << endl;
    TraceFile << numUnlinks << " links removed from the code cache" << endl;
    TraceFile << "#eof" << endl;
    TraceFile.close();
}

/* ================================================================== */
/*
 Initialize and begin program execution under the control of Pin
*/
int main(INT32 argc, CHAR **argv)
{
    if (PIN_Init(argc, argv)) return Usage();

    // Initialize some counters we're using in this tool
    InitCounters();

    // Register a routine that gets called when the cache is first initialized
    CODECACHE_AddCacheInitFunction(PrintInitInfo, 0);

    // Register a routine that gets called when patch a link in
    //  the code cache
    CODECACHE_AddTraceLinkedFunction(WatchLinks, 0);

    // Register a routine that gets called when we unpatch a link in
    //  the code cache
    CODECACHE_AddTraceUnlinkedFunction(WatchUnlinks, 0);

    // Register a routine that gets called when the program ends
    PIN_AddFiniFunction(PrintDetailsOnExit, 0);
    
    PIN_StartProgram();  // Never returns
    
    return 0;
}