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

using namespace std;

static char* replacedfunname = "__pthread_create_2_1";
typedef int (*REPLACEFUNTYPE)(pthread_t * thread, pthread_attr_t * attr, void * (*start_routine)(void *), void * arg);
static AFUNPTR orig_fptr = 0;

class CHANNEL
{
  public:
    THREAD_STARTROUTINE _startroutine;
    VOID* _arg;

    CHANNEL(): _startroutine(0), _arg(0) {}
    VOID Setup(THREAD_STARTROUTINE sr, VOID* a)
    {
        _startroutine = sr;
        _arg = a;
    }
};

//typedef void *(*STARTROUTINE_TYPE)(void *);

// Note: we should dynamically allocate and free channel, as shown below in the commented out "new channel" and "delete channel".
// However, calling "new" and "delete" will invoke RC's thread local
// storage support (when libpinpthread is used), which won't work here because
// my_pthread_create() and my_wrapper_run() are using the application stack, not the pin stack
// for they arenot jitted.

static CHANNEL channel;

void* my_wrapper_run(void* wrapper_arg)
{   
    printf("TOOL: Inside my_wrapper_run()\n");
    fflush(stdout);
    
    CHANNEL* channel = reinterpret_cast<CHANNEL*> (wrapper_arg);

    void* result = PIN_JitThreadStartRoutine(channel->_startroutine, channel->_arg);

#if 0
    delete channel; 
#endif
    
    printf("TOOL: after PIN_JitThreadStartRoutine()\n");
    fflush(stdout);
    
    return result;
}

int my_pthread_create(pthread_t * thread, pthread_attr_t * attr, void * (*start_routine)(void *), void * arg)
{
    printf("TOOL: Inside my_pthread_create()\n");
    fflush(stdout);

    REPLACEFUNTYPE fun = reinterpret_cast<REPLACEFUNTYPE>(orig_fptr);

    // channel must be allocated on the heap instead of on the stack frame on
    // my_pthread_create() since channel could be dereferenced in PIN_JitThreadStartRoutine()
    // after we return from my_pthread_create()

#if 1
    channel.Setup(start_routine, arg);
#else
    CHANNEL* channel = new CHANNEL(start_routine, arg);
    ASSERTX(channel);
#endif
    
    return fun(thread, attr, my_wrapper_run, &channel);
}

VOID ImageLoad(IMG img, VOID * v)
{
    //printf("TOOL: img %s is loaded\n", IMG_Name(img).c_str());
    //fflush(stdout);
    
    RTN rtn = RTN_FindByName(img, replacedfunname);
    
    if (RTN_Valid(rtn))
    {
        //printf("TOOL: Pthread create found\n");
        //fflush(stdout);
        
        RTN_ReplacedByNativeCallToFun(rtn, reinterpret_cast<VOID(*)()>(my_pthread_create));
        
        orig_fptr = RTN_Funptr(rtn);
    }
}

VOID Fini(INT32 code, VOID *)
{
    fprintf(stderr, "\nTOOL: Done\n");
}

int main(INT32 argc, CHAR **argv)
{
    PIN_InitSymbols();
    PIN_Init(argc, argv);
    
    IMG_AddInstrumentFunction(ImageLoad, 0);
    
    PIN_AddFiniFunction(Fini, 0);
    
    // Never returns
    PIN_StartProgram();
    
    return 0;
}