/* Redirection of malloc inside the dynamic linker.

   Copyright (C) 2020 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <https://www.gnu.org/licenses/>.  */

/* The dynamic linker needs to use its own minimal malloc before libc

   has been relocated, and the libc malloc afterwards.  The active

   malloc implementation is reached via the __rtld_* function pointers

   declared below.  They are initialized to the minimal malloc by

   __rtld_malloc_init_stubs, and set to the final implementation by

   __rtld_malloc_init_real.  */

#ifndef _RTLD_MALLOC_H

#define _RTLD_MALLOC_H

#if IS_IN (rtld)

extern __typeof (calloc) *__rtld_calloc attribute_hidden;

extern __typeof (free) *__rtld_free attribute_hidden;

extern __typeof (malloc) *__rtld_malloc attribute_hidden;

extern __typeof (realloc) *__rtld_realloc attribute_hidden;

/* Wrapper functions which call through the function pointers above.

   Note that it is not supported to take the address of those

   functions.  Instead the function pointers must be used

   directly.  */

__extern_inline void *

calloc (size_t a, size_t b)

{

  return __rtld_calloc (a, b);

}

__extern_inline void

free (void *ptr)

{

   __rtld_free (ptr);

}

__extern_inline void *

malloc (size_t size)

{

  return __rtld_malloc (size);

}

__extern_inline void *

realloc (void *ptr, size_t size)

{

  return __rtld_realloc (ptr, size);

}

/* Called after the first self-relocation to activate the minimal malloc

   implementation.  */

void __rtld_malloc_init_stubs (void) attribute_hidden;

/* Return false if the active malloc is the ld.so minimal malloc, true

   if it is the full implementation from libc.so.  */

_Bool __rtld_malloc_is_complete (void) attribute_hidden;

/* Called shortly before the final self-relocation (when RELRO

   variables are still writable) to activate the real malloc

   implementation.  MAIN_MAP is the link map of the executable.  */

struct link_map;

void __rtld_malloc_init_real (struct link_map *main_map) attribute_hidden;

#else /* !IS_IN (rtld) */

/* This allows static/non-rtld builds to get a pointer to the

   functions, in the same way that is required inside rtld.  */

# define __rtld_calloc (&calloc)

# define __rtld_free (&free)

# define __rtld_malloc (&malloc)

# define __rtld_realloc (&realloc)

#endif /* !IS_IN (rtld) */

#endif /* _RTLD_MALLOC_H */