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libctf: check for problems with error returns

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We do this as a writable test because the only known-affected platforms
(with ssize_t longer than unsigned long) use PE, and we do not have support
for CTF linkage in the PE linker yet.

	PR libctf/30836
	* libctf/testsuite/libctf-writable/libctf-errors.*: New test.
This commit is contained in:
Nick Alcock
2023-10-11 15:15:16 +01:00
parent fded0fb898
commit 29736fc507
2 changed files with 75 additions and 0 deletions
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74
libctf/testsuite/libctf-writable/libctf-errors.c Normal file
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@@ -0,0 +1,74 @@
/* Make sure that error returns are correct. Usually this is trivially
true, but on platforms with unusual type sizes all the casting might
cause problems with unexpected sign-extension and truncation. */
#include <ctf-api.h>
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
ctf_dict_t *fp;
ctf_next_t *i = NULL;
size_t boom = 0;
ctf_id_t itype, stype;
ctf_encoding_t encoding = {0};
ctf_membinfo_t mi;
ssize_t ret;
int err;
if ((fp = ctf_create (&err)) == NULL)
{
fprintf (stderr, "%s: cannot create: %s\n", argv[0], ctf_errmsg (err));
return 1;
}
/* First error class: int return. */
if (ctf_member_count (fp, 1024) >= 0)
fprintf (stderr, "int return: non-error return: %i\n",
ctf_member_count(fp, 1024));
/* Second error class: type ID return. */
if (ctf_type_reference (fp, 1024) != CTF_ERR)
fprintf (stderr, "ctf_id_t return: non-error return: %li\n",
ctf_type_reference (fp, 1024));
/* Third error class: ssize_t return. Create a type to iterate over first. */
if ((itype = ctf_add_integer (fp, CTF_ADD_ROOT, "int", &encoding)) == CTF_ERR)
fprintf (stderr, "cannot add int: %s\n", ctf_errmsg (ctf_errno (fp)));
else if ((stype = ctf_add_struct (fp, CTF_ADD_ROOT, "foo")) == CTF_ERR)
fprintf (stderr, "cannot add struct: %s\n", ctf_errmsg (ctf_errno (fp)));
else if (ctf_add_member (fp, stype, "bar", itype) < 0)
fprintf (stderr, "cannot add member: %s\n", ctf_errmsg (ctf_errno (fp)));
if (ctf_member_info (fp, stype, "bar", &mi) < 0)
fprintf (stderr, "cannot get member info: %s\n", ctf_errmsg (ctf_errno (fp)));
/* Iteration should never produce an offset bigger than the offset just returned,
and should quickly terminate. */
while ((ret = ctf_member_next (fp, stype, &i, NULL, NULL, 0)) >= 0) {
if (ret > mi.ctm_offset)
fprintf (stderr, "ssize_t return: unexpected offset: %zi\n", ret);
if (boom++ > 1000)
{
fprintf (stderr, "member iteration went on way too long\n");
exit (1);
}
}
/* Fourth error class (trivial): pointer return. */
if (ctf_type_aname (fp, 1024) != NULL)
fprintf (stderr, "pointer return: non-error return: %p\n",
ctf_type_aname (fp, 1024));
ctf_file_close (fp);
printf("All done.\n");
return 0;
}