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a9944a52c9
GCC 15 introduces allocation dead code removal (DCE) for PR117370 in r15-5255-g7828dc070510f8. This breaks various glibc tests which want to assert various properties of the allocator without doing anything obviously useful with the allocated memory. Alexander Monakov rightly pointed out that we can and should do better than passing -fno-malloc-dce to paper over the problem. Not least because GCC 14 already does such DCE where there's no testing of malloc's return value against NULL, and LLVM has such optimisations too. Handle this by providing malloc (and friends) wrappers with a volatile function pointer to obscure that we're calling malloc (et. al) from the compiler. Reviewed-by: Paul Eggert <eggert@cs.ucla.edu>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/* Copyright (C) 1999-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <libc-diag.h>
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#include <time.h>
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#include "tst-malloc-aux.h"
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static int errors = 0;
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static void
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merror (const char *msg)
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{
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++errors;
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printf ("Error: %s\n", msg);
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}
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static int
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do_test (void)
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{
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void *p, *q;
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int save;
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srandom (time (NULL));
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errno = 0;
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 7 warns about too-large allocations; here we want to test
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that they fail. */
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DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
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#endif
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p = malloc (-1);
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DIAG_POP_NEEDS_COMMENT;
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save = errno;
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if (p != NULL)
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merror ("malloc (-1) succeeded.");
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if (p == NULL && save != ENOMEM)
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merror ("errno is not set correctly");
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p = malloc (10);
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if (p == NULL)
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merror ("malloc (10) failed.");
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/* realloc (p, 0) == free (p). */
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p = realloc (p, 0);
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if (p != NULL)
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merror ("realloc (p, 0) failed.");
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p = malloc (0);
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if (p == NULL)
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merror ("malloc (0) failed.");
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p = realloc (p, 0);
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if (p != NULL)
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merror ("realloc (p, 0) failed.");
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p = malloc (513 * 1024);
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if (p == NULL)
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merror ("malloc (513K) failed.");
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 7 warns about too-large allocations; here we want to test
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that they fail. */
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DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
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#endif
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q = malloc (-512 * 1024);
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DIAG_POP_NEEDS_COMMENT;
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if (q != NULL)
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merror ("malloc (-512K) succeeded.");
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free (p);
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return errors != 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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