drd/drd_clientobj.c

/*
  This file is part of drd, a thread error detector.

  Copyright (C) 2006-2009 Bart Van Assche <bart.vanassche@gmail.com>.

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  02111-1307, USA.

  The GNU General Public License is contained in the file COPYING.
*/


#include "drd_clientobj.h"
#include "drd_suppression.h"
#include "pub_tool_basics.h"
#include "pub_tool_libcassert.h"
#include "pub_tool_libcbase.h"
#include "pub_tool_libcprint.h"   // VG_(message)()
#include "pub_tool_mallocfree.h"
#include "pub_tool_options.h"     // VG_(clo_backtrace_size)
#include "pub_tool_oset.h"
#include "pub_tool_stacktrace.h"
#include "pub_tool_threadstate.h" // VG_(get_running_tid)()


/* Local variables. */

static OSet* s_clientobj_set;
static Bool s_trace_clientobj;


/* Local functions. */

static Bool clientobj_remove_obj(DrdClientobj* const p);


/* Function definitions. */

void DRD_(clientobj_set_trace)(const Bool trace)
{
  s_trace_clientobj = trace;
}

/** Initialize the client object set. */
void DRD_(clientobj_init)(void)
{
  tl_assert(s_clientobj_set == 0);
  s_clientobj_set = VG_(OSetGen_Create)(0, 0, VG_(malloc),
                                        "drd.clientobj.ci.1", VG_(free));
  tl_assert(s_clientobj_set);
}

/**
 * Free the memory allocated for the client object set.
 *
 * @pre Client object set is empty.
 */
void DRD_(clientobj_cleanup)(void)
{
  tl_assert(s_clientobj_set);
  tl_assert(VG_(OSetGen_Size)(s_clientobj_set) == 0);
  VG_(OSetGen_Destroy)(s_clientobj_set);
  s_clientobj_set = 0;
}

/**
 * Return the data associated with the client object at client address addr.
 * Return 0 if there is no client object in the set with the specified start
 * address.
 */
DrdClientobj* DRD_(clientobj_get_any)(const Addr addr)
{
  return VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
}

/**
 * Return the data associated with the client object at client address addr
 * and that has object type t. Return 0 if there is no client object in the
 * set with the specified start address.
 */
DrdClientobj* DRD_(clientobj_get)(const Addr addr, const ObjType t)
{
  DrdClientobj* p;
  p = VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
  if (p && p->any.type == t)
    return p;
  return 0;
}

/** Return true if and only if the address range of any client object overlaps
 *  with the specified address range.
 */
Bool DRD_(clientobj_present)(const Addr a1, const Addr a2)
{
  DrdClientobj *p;

  tl_assert(a1 < a2);
  VG_(OSetGen_ResetIter)(s_clientobj_set);
  for ( ; (p = VG_(OSetGen_Next)(s_clientobj_set)) != 0; )
  {
    if (a1 <= p->any.a1 && p->any.a1 < a2)
    {
      return True;  
    }
  }
  return False;
}

/** Add state information for the client object at client address addr and
 *  of type t. Suppress data race reports on the address range [addr,addr+size[.
 *  @pre No other client object is present in the address range [addr,addr+size[.
 */
DrdClientobj* DRD_(clientobj_add)(const Addr a1, const ObjType t)
{
  DrdClientobj* p;

  tl_assert(! DRD_(clientobj_present)(a1, a1 + 1));
  tl_assert(VG_(OSetGen_Lookup)(s_clientobj_set, &a1) == 0);

  if (s_trace_clientobj)
  {
    VG_(message)(Vg_UserMsg, "Adding client object 0x%lx of type %d", a1, t);
  }

  p = VG_(OSetGen_AllocNode)(s_clientobj_set, sizeof(*p));
  VG_(memset)(p, 0, sizeof(*p));
  p->any.a1   = a1;
  p->any.type = t;
  p->any.first_observed_at = VG_(record_ExeContext)(VG_(get_running_tid)(), 0);
  VG_(OSetGen_Insert)(s_clientobj_set, p);
  tl_assert(VG_(OSetGen_Lookup)(s_clientobj_set, &a1) == p);
  DRD_(start_suppression)(a1, a1 + 1, "clientobj");
  return p;
}

/**
 * Remove the information that was stored about the client object.
 *
 * @param[in] addr Address of the client object in the client address space.
 * @param[in] t    Type of the client object.
 */
Bool DRD_(clientobj_remove)(const Addr addr, const ObjType t)
{
  DrdClientobj* p;

  p = VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
  tl_assert(p);
  tl_assert(p->any.type == t);
  return clientobj_remove_obj(p);
}

/**
 * Remove the information that was stored about the client object p.
 *
 * @note The order of operations below is important. The client object is
 *   removed from the client object set after the cleanup function has been
 *   called such that if the cleanup function can still use the function
 *   DRD_(clientobj_get_any)(). This happens e.g. in the function
 *   first_observed() in drd_error.c.
 */
static Bool clientobj_remove_obj(DrdClientobj* const p)
{
  tl_assert(p);

  if (s_trace_clientobj)
  {
    VG_(message)(Vg_UserMsg, "Removing client object 0x%lx of type %d",
                 p->any.a1, p->any.type);
  }

  tl_assert(p->any.cleanup);
  (*p->any.cleanup)(p);
  VG_(OSetGen_Remove)(s_clientobj_set, &p->any.a1);
  VG_(OSetGen_FreeNode)(s_clientobj_set, p);
  return True;
}

void DRD_(clientobj_stop_using_mem)(const Addr a1, const Addr a2)
{
  Addr removed_at;
  DrdClientobj* p;

  tl_assert(s_clientobj_set);

  if (! DRD_(is_any_suppressed)(a1, a2))
    return;

  VG_(OSetGen_ResetIter)(s_clientobj_set);
  p = VG_(OSetGen_Next)(s_clientobj_set);
  for ( ; p != 0; )
  {
    if (a1 <= p->any.a1 && p->any.a1 < a2)
    {
      removed_at = p->any.a1;
      clientobj_remove_obj(p);
      /* The above call removes an element from the oset and hence */
      /* invalidates the iterator. Set the iterator back.          */
      VG_(OSetGen_ResetIterAt)(s_clientobj_set, &removed_at);
    }
    else
    {
      p = VG_(OSetGen_Next)(s_clientobj_set);
    }
  }
}

/**
 * Delete the per-thread information stored in client objects for the
 * specified thread.
 */
void DRD_(clientobj_delete_thread)(const DrdThreadId tid)
{
  DrdClientobj *p;

  VG_(OSetGen_ResetIter)(s_clientobj_set);
  for ( ; (p = VG_(OSetGen_Next)(s_clientobj_set)) != 0; )
  {
    if (p->any.delete_thread)
    {
      (*p->any.delete_thread)(p, tid);
    }
  }
}

const char* DRD_(clientobj_type_name)(const ObjType t)
{
  switch (t)
  {
  case ClientMutex:     return "mutex";
  case ClientCondvar:   return "cond";
  case ClientSemaphore: return "semaphore";
  case ClientBarrier:   return "barrier";
  case ClientRwlock:    return "rwlock";
  }
  return "(unknown)";
}