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//
//  ORIGINAL_AUTHOR: Kim Hazelwood
//
//  This tool watches when the control is about to enter the
//       code cache and tells the user
//  Sample usage:
//    To see the first execution of each trace only 
//    pin -t enter_exit -- /bin/ls  
//
//    Turn off linking to see all executions
//    pin -xyzzy -link_indirect 0 -link_pcrel 0 -link_return 0 -t enter_exit -- /bin/ls  

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

using namespace std;

/* ================================================================== */
/* Global Variables                                                   */
/* ================================================================== */
int numJumpsIntoCodeCache;
int numJumpsOutofCodeCache;
ofstream TraceFile;

/* ===================================================================== */
/* Commandline Switches */
/* ===================================================================== */
KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool",
    "o", "enter_exit.out", "specify trace file name");

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

    numJumpsIntoCodeCache = 0;
    numJumpsOutofCodeCache = 0;
}

/* ================================================================== */
/*
 Print details of jumps into code cache
*/
VOID WatchEnter(ADDRINT cache_pc)
{
    numJumpsIntoCodeCache++;
    TraceFile << "Jump into code cache #" << dec << numJumpsIntoCodeCache;
    TraceFile << "\tcache pc=0x" << hex << cache_pc << endl;
}
/* ================================================================== */
/*
 Print details of jumps out of code cache
*/
VOID WatchExit(ADDRINT cache_pc)
{
    numJumpsOutofCodeCache++;
    TraceFile << "Jump out of code cache #" << dec << numJumpsOutofCodeCache;
    TraceFile << "\tcache pc=0x" << hex << cache_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 << numJumpsIntoCodeCache << " control transfers into code cache" << endl;
    TraceFile << numJumpsOutofCodeCache << " control transfers out of 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 we jump into 
    //  the code cache
    CODECACHE_AddCodeCacheEnteredFunction(WatchEnter, 0);

    // Register a routine that gets called when we jump out of  
    //  the code cache
    CODECACHE_AddCodeCacheExitedFunction(WatchExit, 0);

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