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/* Test program for dwfl_module_return_value_location.
Copyright (C) 2005 Red Hat, Inc.
Copyright (C) 2023 Mark J. Wielaard <mark@klomp.org>
This file is part of elfutils.
This file 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 of the License, or
(at your option) any later version.
elfutils 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <assert.h>
#include <inttypes.h>
#include ELFUTILS_HEADER(dwfl)
#include <dwarf.h>
#include <argp.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <fnmatch.h>
#include "system.h"
struct args
{
Dwfl *dwfl;
Dwarf_Die *cu;
Dwarf_Addr dwbias;
char **argv;
};
static int
handle_function (Dwarf_Die *funcdie, void *arg)
{
struct args *a = arg;
const char *name = dwarf_diename (funcdie);
char **argv = a->argv;
if (argv[0] != NULL)
{
bool match;
do
match = fnmatch (*argv, name, 0) == 0;
while (!match && *++argv);
if (!match)
return 0;
}
printf ("(%s) %s: ", dwfl_module_info (dwfl_cumodule (a->cu), NULL,
NULL, NULL,
NULL, NULL,
NULL, NULL), name);
const Dwarf_Op *locops;
int nlocops = dwfl_module_return_value_location (dwfl_cumodule (a->cu),
funcdie, &locops);
if (nlocops < 0)
error (EXIT_FAILURE, 0, "dwfl_module_return_value_location: %s",
dwfl_errmsg (-1));
else if (nlocops == 0)
{
// Check if this is the special unspecified type
// https://sourceware.org/bugzilla/show_bug.cgi?id=30047
Dwarf_Die die_mem, *typedie = &die_mem;
Dwarf_Attribute attr_mem, *attr;
attr = dwarf_attr_integrate (funcdie, DW_AT_type, &attr_mem);
if (dwarf_formref_die (attr, typedie) != NULL
&& dwarf_tag (typedie) == DW_TAG_unspecified_type)
puts ("returns unspecified type");
else
puts ("returns no value");
}
else
{
printf ("return value location:");
for (int i = 0; i < nlocops; ++i)
printf (" {%#x, %#" PRIx64 "}", locops[i].atom, locops[i].number);
puts ("");
}
return 0;
}
int
main (int argc, char *argv[])
{
int remaining;
/* Set locale. */
(void) setlocale (LC_ALL, "");
struct args a = { .dwfl = NULL, .cu = NULL };
(void) argp_parse (dwfl_standard_argp (), argc, argv, 0, &remaining,
&a.dwfl);
assert (a.dwfl != NULL);
a.argv = &argv[remaining];
int result = 0;
while ((a.cu = dwfl_nextcu (a.dwfl, a.cu, &a.dwbias)) != NULL)
dwarf_getfuncs (a.cu, &handle_function, &a, 0);
dwfl_end (a.dwfl);
return result;
}
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