btrace-common.c

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/* Copyright (C) 2014-2018 Free Software Foundation, Inc.

   Contributed by Intel Corp. <markus.t.metzger@intel.com>

   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 "common-defs.h"
#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 (__FILE__, __LINE__, _("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 (__FILE__, __LINE__, _("Unknown branch trace format"));
}

/* See btrace-common.h.  */

void
btrace_data_init (struct btrace_data *data)
{
  data->format = BTRACE_FORMAT_NONE;
}

/* See btrace-common.h.  */

void
btrace_data_fini (struct btrace_data *data)
{
  switch (data->format)
    {
    case BTRACE_FORMAT_NONE:
      /* Nothing to do.  */
      return;

    case BTRACE_FORMAT_BTS:
      VEC_free (btrace_block_s, data->variant.bts.blocks);
      return;

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

  internal_error (__FILE__, __LINE__, _("Unkown branch trace format."));
}

/* See btrace-common.h.  */

int
btrace_data_empty (struct btrace_data *data)
{
  switch (data->format)
    {
    case BTRACE_FORMAT_NONE:
      return 1;

    case BTRACE_FORMAT_BTS:
      return VEC_empty (btrace_block_s, data->variant.bts.blocks);

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

  internal_error (__FILE__, __LINE__, _("Unkown branch trace format."));
}

/* See btrace-common.h.  */

void
btrace_data_clear (struct btrace_data *data)
{
  btrace_data_fini (data);
  btrace_data_init (data);
}

/* 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 = NULL;

      /* Fall-through.  */
    case BTRACE_FORMAT_BTS:
      {
        unsigned int blk;

        /* We copy blocks in reverse order to have the oldest block at
           index zero.  */
        blk = VEC_length (btrace_block_s, src->variant.bts.blocks);
        while (blk != 0)
          {
        btrace_block_s *block;

        block = VEC_index (btrace_block_s, src->variant.bts.blocks,
                   --blk);

        VEC_safe_push (btrace_block_s, dst->variant.bts.blocks, 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;

      /* fall-through.  */
    case BTRACE_FORMAT_PT:
      {
        gdb_byte *data;
        size_t size;

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

        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 (__FILE__, __LINE__, _("Unkown branch trace format."));
}