/* Copyright (C) 2014-2024 Free Software Foundation, Inc.

  Contributed by Intel Corp. <[email protected]>

  This file is part of GDB.

  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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "btrace-common.h"


/* See btrace-common.h.  */

const char *
btrace_format_string (enum btrace_format format)
{
 switch (format)
   {
   case BTRACE_FORMAT_NONE:
     return _("No or unknown format");

   case BTRACE_FORMAT_BTS:
     return _("Branch Trace Store");

   case BTRACE_FORMAT_PT:
     return _("Intel Processor Trace");
   }

 internal_error (_("Unknown branch trace format"));
}

/* See btrace-common.h.  */

const char *
btrace_format_short_string (enum btrace_format format)
{
 switch (format)
   {
   case BTRACE_FORMAT_NONE:
     return "unknown";

   case BTRACE_FORMAT_BTS:
     return "bts";

   case BTRACE_FORMAT_PT:
     return "pt";
   }

 internal_error (_("Unknown branch trace format"));
}

/* See btrace-common.h.  */

void
btrace_data::fini ()
{
 switch (format)
   {
   case BTRACE_FORMAT_NONE:
     /* Nothing to do.  */
     return;

   case BTRACE_FORMAT_BTS:
     delete variant.bts.blocks;
     variant.bts.blocks = nullptr;
     return;

   case BTRACE_FORMAT_PT:
     xfree (variant.pt.data);
     return;
   }

 internal_error (_("Unknown branch trace format."));
}

/* See btrace-common.h.  */

bool
btrace_data::empty () const
{
 switch (format)
   {
   case BTRACE_FORMAT_NONE:
     return true;

   case BTRACE_FORMAT_BTS:
     return variant.bts.blocks->empty ();

   case BTRACE_FORMAT_PT:
     return (variant.pt.size == 0);
   }

 internal_error (_("Unknown branch trace format."));
}

/* See btrace-common.h.  */

void
btrace_data::clear ()
{
 fini ();
 format = BTRACE_FORMAT_NONE;
}

/* See btrace-common.h.  */

int
btrace_data_append (struct btrace_data *dst,
                   const struct btrace_data *src)
{
 switch (src->format)
   {
   case BTRACE_FORMAT_NONE:
     return 0;

   case BTRACE_FORMAT_BTS:
     switch (dst->format)
       {
       default:
         return -1;

       case BTRACE_FORMAT_NONE:
         dst->format = BTRACE_FORMAT_BTS;
         dst->variant.bts.blocks = new std::vector<btrace_block>;
         [[fallthrough]];
       case BTRACE_FORMAT_BTS:
         {
           unsigned int blk;

           /* We copy blocks in reverse order to have the oldest block at
              index zero.  */
           blk = src->variant.bts.blocks->size ();
           while (blk != 0)
             {
               const btrace_block &block
                 = src->variant.bts.blocks->at (--blk);
               dst->variant.bts.blocks->push_back (block);
             }
         }
       }
     return 0;

   case BTRACE_FORMAT_PT:
     switch (dst->format)
       {
       default:
         return -1;

       case BTRACE_FORMAT_NONE:
         dst->format = BTRACE_FORMAT_PT;
         dst->variant.pt.data = NULL;
         dst->variant.pt.size = 0;
         [[fallthrough]];
       case BTRACE_FORMAT_PT:
         {
           gdb_byte *data;
           size_t size;

           size = src->variant.pt.size + dst->variant.pt.size;
           data = (gdb_byte *) xmalloc (size);

           if (dst->variant.pt.size > 0)
             memcpy (data, dst->variant.pt.data, dst->variant.pt.size);
           memcpy (data + dst->variant.pt.size, src->variant.pt.data,
                   src->variant.pt.size);

           xfree (dst->variant.pt.data);

           dst->variant.pt.data = data;
           dst->variant.pt.size = size;
         }
       }
     return 0;
   }

 internal_error (_("Unknown branch trace format."));
}