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/*! @file
 * Probe mode detach-reattach test which confirms that each thread get its respective thread detach callbacks.
 */

#include "pin.H"
#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <assert.h>
#include <sched.h>
#include <linux/unistd.h>
#include <sys/syscall.h>

#define MAX_ITERATION 2

const char * FIRST_DLL_NAME = "my_dll.so";

const char * SECOND_DLL_NAME = "my_dll_1.so";

static int iteration = 1;

using std::cerr;
/* ===================================================================== */
/* Commandline Switches */
/* ===================================================================== */

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

ofstream TraceFile;

PIN_LOCK lock;
/* ===================================================================== */


/* Session control checks that there is no callbacks mix between different
 * attach-detach iterations
 */
class SESSION_CONTROL
{
  public:
    SESSION_CONTROL():_currentIteration(0), 
        _threadCounter(0),
        _startAttachSession(FALSE),
        _startDetachSession(FALSE)
    {}

    static VOID AttachedThreadStart(VOID *sigmask, VOID *v);
    static INT DedicatedThread(VOID *arg);

    VOID StartIteration(UINT32 it) { _currentIteration = it; _threadCounter = 0;}
    UINT32 CurrentIteration() { return _currentIteration; }
    BOOL GotFirstThreadNotification(UINT32 it)
    {
        return ((it == _currentIteration) && (_threadCounter > 0));
    }

    static SESSION_CONTROL* Instance() { return &m_instance; }

    VOID StartDetach()
    {
        _startDetachSession = TRUE;
        _startAttachSession = FALSE;
    }
    VOID StartAttach()
    {
        _startAttachSession = TRUE;
        _startDetachSession = FALSE;
    }
    VOID WaitForDetach() { while (!_startDetachSession) sched_yield(); }
    VOID WaitForAttach() { while (!_startAttachSession) sched_yield(); }
  private:
    UINT32 _currentIteration;
    UINT32 _threadCounter;
    volatile BOOL _startAttachSession;
    volatile BOOL _startDetachSession;
    static SESSION_CONTROL m_instance;
};

SESSION_CONTROL SESSION_CONTROL::m_instance;

SESSION_CONTROL *SessionControl() { return SESSION_CONTROL::Instance(); }

/* Detach session
 * Callbacks and function replacements
 */
class DETACH_SESSION
{
  public:
    // Detach completion notification
    static VOID DetachCompleted(VOID *v);
    static VOID DetachThreadStart(VOID *v);
    static VOID ImageLoad(IMG img, VOID *v);
};


/* Reattach session */
class REATTACH_SESSION
{
  public:
    static VOID ImageLoad(IMG img, VOID *v);
    static VOID AttachedThreadStart(VOID *sigmask, VOID *v);
};


/*
 * Pin-tool detach-completed callback
 * Called from Pin
 */
VOID DETACH_SESSION::DetachCompleted(VOID *v)
{
    unsigned long detachIteration = (unsigned long)v;
    if (detachIteration != SessionControl()->CurrentIteration())
    {
        cerr << "Detach iteration error: Expected " << SessionControl()->CurrentIteration()
            << " Rececived " << detachIteration << " In DetachCompleted" << endl;
        PIN_ExitProcess (1);
    }

    PIN_GetLock(&lock, PIN_GetTid());
    TraceFile << "Detach session " << detachIteration << " Detach completed; tid = "
             << PIN_GetTid() << endl;
    if (detachIteration == MAX_ITERATION)
    {
        TraceFile <<  "TEST PASSED" << endl;
        TraceFile.close();
        PIN_ExitProcess(0);
    }
    PIN_ReleaseLock(&lock);
    SessionControl()->StartAttach();
}

BOOL afterAttachProbe(void)
{
    return TRUE;
}


VOID AttachMain(VOID *arg)
{
    UINT32 reattachIteration = *(reinterpret_cast <UINT32 *> (&arg));
    SessionControl()->StartIteration(reattachIteration);
    IMG_AddInstrumentFunction(REATTACH_SESSION::ImageLoad, arg);
    PIN_AddDetachFunctionProbed(DETACH_SESSION::DetachCompleted, arg);
    PIN_AddThreadAttachProbedFunction(SESSION_CONTROL::AttachedThreadStart, arg);
    PIN_AddThreadDetachProbedFunction(DETACH_SESSION::DetachThreadStart, arg);
}


INT SESSION_CONTROL::DedicatedThread(VOID *arg)
{
    ADDRINT reattachIteration = 2;
    while (1)
    {
        SessionControl()->WaitForDetach();
        PIN_GetLock(&lock, PIN_GetTid());
        TraceFile << "Pin tool: sending detach request" << endl;
        PIN_ReleaseLock(&lock);
        PIN_DetachProbed();
        SessionControl()->WaitForAttach();
        PIN_GetLock(&lock, PIN_GetTid());
        TraceFile << "Pin tool: sending attach request" << endl;
        PIN_ReleaseLock(&lock);
        PIN_AttachProbed(AttachMain, (VOID *)reattachIteration++);
    }
    return 0;
}


/* Thread start notification in the first session */
VOID SESSION_CONTROL::AttachedThreadStart(VOID *sigmask, VOID *arg)
{
    unsigned long iteration = (unsigned long)arg;
    if (iteration != SessionControl()->CurrentIteration())
    {
        cerr << "Iteration error: Expected " << SessionControl()->CurrentIteration()
            << " Received " << iteration << " In AttachedThreadStart" << endl;
         PIN_ExitProcess (1);
    }
    PIN_GetLock(&lock, PIN_GetTid());
    ++(SessionControl()->_threadCounter) ;
    TraceFile << "Thread start " <<" notification at session " << iteration << " tid " << PIN_GetTid()<< endl;
    PIN_ReleaseLock(&lock);
}

VOID DETACH_SESSION::DetachThreadStart(VOID *arg)
{
    unsigned long iteration = (unsigned long)arg;
    if (iteration != SessionControl()->CurrentIteration())
    {
        cerr << "Iteration error: Expected " << SessionControl()->CurrentIteration()
            << " Received " << iteration << " In DetachThreadStart" << endl;
        PIN_ExitProcess (1);
    }
    PIN_GetLock(&lock, PIN_GetTid());
    TraceFile << "Thread detach "  << " notification at session " << iteration << " tid " << PIN_GetTid() << endl;
    PIN_ReleaseLock(&lock);
}


/*
 *Image load callback for the first Pin session
 */
VOID DETACH_SESSION::ImageLoad(IMG img,  VOID *v)
{
    if ( IMG_IsMainExecutable(img))
    {
        RTN rtn = RTN_FindByName(img, "AfterAttach1");

        // relevent only in the attach scenario.
        if (RTN_Valid(rtn))
        {
            RTN_ReplaceProbed(rtn, AFUNPTR(afterAttachProbe));
        }
    }

    PIN_GetLock(&lock, PIN_GetTid());
    TraceFile <<"Load image " << IMG_Name(img) << "in iteration " << iteration << endl;
    PIN_ReleaseLock(&lock);
    size_t found;
    found= IMG_Name(img).find(FIRST_DLL_NAME);
    if ( found!=string::npos )
    {
		SessionControl()->StartDetach();
    }
}

/*
 *Image load callback for the second Pin session
 */
VOID REATTACH_SESSION::ImageLoad(IMG img,  VOID *v)
{
    if ( IMG_IsMainExecutable(img))
    {
        RTN rtn = RTN_FindByName(img, "AfterAttach2");
        if (RTN_Valid(rtn))
        {
            RTN_ReplaceProbed(rtn, AFUNPTR(afterAttachProbe));
        }
    }

    PIN_GetLock(&lock, PIN_GetTid());
    TraceFile <<"Load image " << IMG_Name(img) <<" in iteration" << iteration  <<endl;
    PIN_ReleaseLock(&lock);

    size_t found;
    found= IMG_Name(img).find(SECOND_DLL_NAME);
    if ( found!=string::npos )
    {
        SessionControl()->StartDetach();
    }
}

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

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

    PIN_Init(argc,argv);
    SessionControl()->StartIteration(1);
    PIN_InitLock(&lock);
    TraceFile.open(KnobOutputFile.Value().c_str());
    IMG_AddInstrumentFunction(DETACH_SESSION::ImageLoad,(VOID *) 1);
    PIN_AddDetachFunctionProbed(DETACH_SESSION::DetachCompleted, (VOID *)1);
    PIN_AddThreadAttachProbedFunction(SESSION_CONTROL::AttachedThreadStart, (VOID *)1);
    PIN_AddThreadDetachProbedFunction(DETACH_SESSION::DetachThreadStart, (VOID *)1);
    UINT32 stackSize = 0x40000;
    UINT8 *stack = new UINT8[stackSize];
    
    // thread stack should be aligned 
    UINT8 *stackTop = (UINT8*)((((ADDRINT)stack + stackSize) >> 4) << 4);
    int flags = (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_THREAD | CLONE_PARENT);
    int tid = clone(SESSION_CONTROL::DedicatedThread, stackTop, flags, 0);
    assert(tid != -1);
    PIN_StartProgramProbed();

    return 0;
}

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