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/* Test for IFUNC handling with local definitions.
Copyright (C) 2019-2021 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/>. */
/* This test is based on gcc.dg/attr-ifunc-4.c. */
#include <config.h>
#ifdef HAVE_GCC_IFUNC
# include <stdbool.h>
# include <stdio.h>
/* Do not use the test framework, so that the process setup is not
disturbed. */
static volatile int implementation_called;
static volatile int resolver_called;
/* Just a random constant, to check that we called the right
function. */
enum { random_constant = 0x3a88d66d };
static int
implementation (void)
{
++implementation_called;
return random_constant;
}
static __typeof__ (implementation) *
resolver (void)
{
++resolver_called;
return implementation;
}
static int magic (void) __attribute__ ((ifunc ("resolver")));
int
main (void)
{
bool errors = false;
if (implementation_called != 0)
{
printf ("error: initial value of implementation_called is not zero:"
" %d\n", implementation_called);
errors = true;
}
/* This can be zero if the reference is bound lazily. */
printf ("info: initial value of resolver_called: %d\n", resolver_called);
int magic_value = magic ();
if (magic_value != random_constant)
{
printf ("error: invalid magic value: 0x%x\n", magic_value);
errors = true;
}
printf ("info: resolver_called value: %d\n", resolver_called);
if (resolver_called == 0)
{
/* In theory, the resolver could be called multiple times if
several relocations are needed. */
puts ("error: invalid resolver_called value (must not be zero)");
errors = true;
}
printf ("info: implementation_called value: %d\n", implementation_called);
if (implementation_called != 1)
{
puts ("error: invalid implementation_called value (must be 1)");
errors = true;
}
return errors;
}
#else /* !HAVE_GCC_IFUNC */
# include <support/check.h>
static int
do_test (void)
{
FAIL_UNSUPPORTED ("GCC does not support the ifunc attribute");
return 1; /* Not reachable. */
}
# include <support/test-driver.c>
#endif
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