/* Create new COMMON symbol.

   Copyright (C) 2002, 2016 Red Hat, Inc.

   This file is part of elfutils.

   Written by Ulrich Drepper <drepper@redhat.com>, 2002.

   This file is free software; you can redistribute it and/or modify

   it under the terms of either

     * the GNU Lesser General Public License as published by the Free

       Software Foundation; either version 3 of the License, or (at

       your option) any later version

   or

     * 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

   or both in parallel, as here.

   elfutils 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 copies of the GNU General Public License and

   the GNU Lesser General Public License along with this program.  If

   not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <inttypes.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <libasmP.h>

#include <system.h>

/* Object for special COMMON section.  */

static const AsmScn_t __libasm_com_scn =

  {

    .data = {

      .main = {

	.scn = ASM_COM_SCN

      }

    }

  };

AsmSym_t *

asm_newcomsym (AsmCtx_t *ctx, const char *name, GElf_Xword size,

	       GElf_Addr align)

{

  AsmSym_t *result;

  if (ctx == NULL)

    /* Something went wrong before.  */

    return NULL;

  /* Common symbols are public.  Therefore the user must provide a

     name.  */

  if (name == NULL)

    {

      __libasm_seterrno (ASM_E_INVALID);

      return NULL;

    }

  rwlock_wrlock (ctx->lock);

  result = (AsmSym_t *) malloc (sizeof (AsmSym_t));

  if (result == NULL)

    return NULL;

  result->scn = (AsmScn_t *) &__libasm_com_scn;

  result->size = size;

  /* XXX Do we have to allow a different type?  */

  result->type = STT_OBJECT;

  /* XXX Do we have to allow a different binding?  */

  result->binding = STB_GLOBAL;

  result->symidx = 0;

  result->strent = dwelf_strtab_add (ctx->symbol_strtab, name);

  /* The value of a COM symbol is the alignment.  Since there are no

     subsection and the initial offset of the section is 0 we can get

     the alignment recorded by storing it into the offset field.  */

  result->offset = align;

  if (unlikely (ctx->textp))

    fprintf (ctx->out.file, "\t.comm %s, %" PRIuMAX ", %" PRIuMAX "\n",

	     name, (uintmax_t) size, (uintmax_t) align);

  else

    {

      /* Put the symbol in the hash table so that we can later find it.  */

      if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result)

	  != 0)

	{

	  /* The symbol already exists.  */

	  __libasm_seterrno (ASM_E_DUPLSYM);

	  free (result);

	  result = NULL;

	}

      else if (name != NULL && asm_emit_symbol_p (name))

	/* Only count non-private symbols.  */

	++ctx->nsymbol_tab;

    }

  rwlock_unlock (ctx->lock);

  return result;

}