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/* Copyright (C) 2023-2025 Free Software Foundation, Inc.
Contributed by Siemens.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp 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, or (at your option)
any later version.
Libgomp 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* This file is used to create a hash table on the host that is supposed
to get use on the device - that's for the 'indirect' clause feature.
In order to habe host initialization work, the pointer sizes must be
the same - and either the the endianess or the host-device memcopy
has to take of it. */
typedef unsigned __int128 hash_entry_type;
#define INDIRECT_HOST_ADDR(p) ((void *) (uintptr_t) p)
#define INDIRECT_DEV_ADDR(p) ((void*) (uintptr_t) (p >> 64))
#define SET_INDIRECT_ADDRS(p, h, d) \
p = (((unsigned __int128) h) + (((unsigned __int128) d) << 64))
_Static_assert (sizeof (unsigned __int128) == 2 * sizeof (void*),
"hash_entry_type size mismatch");
static inline void *htab_alloc (size_t size) {
return malloc (size);
}
static inline void htab_free (void *ptr) { free (ptr); }
#include "hashtab.h"
static inline hashval_t
htab_hash (hash_entry_type element)
{
return hash_pointer (INDIRECT_HOST_ADDR (element));
}
static inline bool
htab_eq (hash_entry_type x, hash_entry_type y)
{
return INDIRECT_HOST_ADDR (x) == INDIRECT_HOST_ADDR (x);
}
void*
create_target_indirect_map (size_t *h_size, size_t count,
uint64_t *host_addrs, uint64_t *device_addrs)
{
assert (htab_find); /* Silence -Werror=unused-function. */
htab_t indirect_htab = htab_create (count);
hash_entry_type element;
for (int i = 0; i < count; i++)
{
SET_INDIRECT_ADDRS (element, host_addrs[i], device_addrs[i]);
hash_entry_type *slot = htab_find_slot (&indirect_htab, element,
INSERT);
*slot = element;
}
*h_size = (sizeof (struct htab)
+ htab_size (indirect_htab) * sizeof (hash_entry_type));
return (void*) indirect_htab;
}
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