memcheck/mc_errcontext.c

/*--------------------------------------------------------------------*/
/*--- Management of memory error messages.                         ---*/
/*---                                              mc_errcontext.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of MemCheck, a heavyweight Valgrind tool for
   detecting memory errors.

   Copyright (C) 2000-2005 Julian Seward 
      jseward@acm.org

   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 "mc_include.h"

/*------------------------------------------------------------*/
/*--- Printing errors                                      ---*/
/*------------------------------------------------------------*/

void TL_(pp_Error) ( Error* err )
{
   MAC_Error* err_extra = VG_(get_error_extra)(err);

   switch (VG_(get_error_kind)(err)) {
      case CoreMemErr: {
         Char* s = ( err_extra->isUnaddr ? "unaddressable" : "uninitialised" );
         VG_(message)(Vg_UserMsg, "%s contains %s byte(s)", 
                      VG_(get_error_string)(err), s);
         VG_(pp_ExeContext)( VG_(get_error_where)(err) );
         break;
      
      } 
      
      case ValueErr:
         if (err_extra->size == 0) {
             VG_(message)(Vg_UserMsg,
                "Conditional jump or move depends on uninitialised value(s)");
         } else {
             VG_(message)(Vg_UserMsg,
                          "Use of uninitialised value of size %d",
                          err_extra->size);
         }
         VG_(pp_ExeContext)( VG_(get_error_where)(err) );
         break;

      case ParamErr: {
         Bool isReg = ( Register == err_extra->addrinfo.akind );
         Char* s1 = ( isReg ? "contains" : "points to" );
         Char* s2 = ( err_extra->isUnaddr ? "unaddressable" : "uninitialised" );
         if (isReg) tl_assert(!err_extra->isUnaddr);

         VG_(message)(Vg_UserMsg, "Syscall param %s %s %s byte(s)",
                      VG_(get_error_string)(err), s1, s2);

         VG_(pp_ExeContext)( VG_(get_error_where)(err) );
         MAC_(pp_AddrInfo)(VG_(get_error_address)(err), &err_extra->addrinfo);
         break;
      }
      case UserErr: {
         Char* s = ( err_extra->isUnaddr ? "Unaddressable" : "Uninitialised" );

         VG_(message)(Vg_UserMsg, 
            "%s byte(s) found during client check request", s);

         VG_(pp_ExeContext)( VG_(get_error_where)(err) );
         MAC_(pp_AddrInfo)(VG_(get_error_address)(err), &err_extra->addrinfo);
         break;
      }
      default: 
         MAC_(pp_shared_Error)(err);
         break;
   }
}

/*------------------------------------------------------------*/
/*--- Recording errors                                     ---*/
/*------------------------------------------------------------*/

/* Creates a copy of the `extra' part, updates the copy with address info if
   necessary, and returns the copy. */
/* This one called from generated code and non-generated code. */
void MC_(record_value_error) ( ThreadId tid, Int size )
{
   MAC_Error err_extra;

   MAC_(clear_MAC_Error)( &err_extra );
   err_extra.size     = size;
   err_extra.isUnaddr = False;
   VG_(maybe_record_error)( tid, ValueErr, /*addr*/0, /*s*/NULL, &err_extra );
}

/* This called from non-generated code */

void MC_(record_user_error) ( ThreadId tid, Addr a, Bool isWrite,
                              Bool isUnaddr )
{
   MAC_Error err_extra;

   tl_assert(VG_INVALID_THREADID != tid);
   MAC_(clear_MAC_Error)( &err_extra );
   err_extra.addrinfo.akind = Undescribed;
   err_extra.isUnaddr       = isUnaddr;
   VG_(maybe_record_error)( tid, UserErr, a, /*s*/NULL, &err_extra );
}

/*------------------------------------------------------------*/
/*--- Suppressions                                         ---*/
/*------------------------------------------------------------*/

Bool TL_(recognised_suppression) ( Char* name, Supp* su )
{
   SuppKind skind;

   if (MAC_(shared_recognised_suppression)(name, su))
      return True;

   /* Extra suppressions not used by Addrcheck */
   else if (VG_STREQ(name, "Cond"))    skind = Value0Supp;
   else if (VG_STREQ(name, "Value0"))  skind = Value0Supp;/* backwards compat */
   else if (VG_STREQ(name, "Value1"))  skind = Value1Supp;
   else if (VG_STREQ(name, "Value2"))  skind = Value2Supp;
   else if (VG_STREQ(name, "Value4"))  skind = Value4Supp;
   else if (VG_STREQ(name, "Value8"))  skind = Value8Supp;
   else if (VG_STREQ(name, "Value16")) skind = Value16Supp;
   else 
      return False;

   VG_(set_supp_kind)(su, skind);
   return True;
}

/*--------------------------------------------------------------------*/
/*--- end                                          mc_errcontext.c ---*/
/*--------------------------------------------------------------------*/