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https://github.com/JakeHillion/drgn.git
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1cedca8ff4
Based on: c950e8a9 config: Fix spec file, add manpages and new GFDL license. With the following patches: configure: Add --disable-programs configure: Add --disable-shared configure: Fix -D_FORTIFY_SOURCE=2 check when CFLAGS contains -Wno-error libcpu: compile i386_lex.c with -Wno-implicit-fallthrough The plan is to stop relying on the distribution's version of elfutils and instead ship our own. This gives us freedom to assume that we're using the latest version and even ship our own patches (starting with a few build system improvements). More details are in scripts/update-elfutils.sh, which was used to generate this commit.
172 lines
3.5 KiB
C
172 lines
3.5 KiB
C
/* Error handling in libdwfl.
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Copyright (C) 2005-2015 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <libintl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "libdwflP.h"
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/* The error number. */
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static __thread int global_error;
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int
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dwfl_errno (void)
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{
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int result = global_error;
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global_error = DWFL_E_NOERROR;
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return result;
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}
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INTDEF (dwfl_errno)
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struct msgtable
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{
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#define DWFL_ERROR(name, text) char msg_##name[sizeof text];
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DWFL_ERRORS
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#undef DWFL_ERROR
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};
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static const union
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{
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struct msgtable table;
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char strings[
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#define DWFL_ERROR(name, text) + sizeof text
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DWFL_ERRORS
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#undef DWFL_ERROR
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];
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} msgtable =
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{
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.table =
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{
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#define DWFL_ERROR(name, text) text,
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DWFL_ERRORS
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#undef DWFL_ERROR
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}
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};
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#define msgstr (msgtable.strings)
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static const uint_fast16_t msgidx[] =
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{
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#define DWFL_ERROR(name, text) \
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[DWFL_E_##name] = offsetof (struct msgtable, msg_##name),
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DWFL_ERRORS
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#undef DWFL_ERROR
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};
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#define nmsgidx (sizeof msgidx / sizeof msgidx[0])
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static inline int
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canonicalize (Dwfl_Error error)
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{
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unsigned int value;
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switch (error)
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{
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default:
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value = error;
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if ((value &~ 0xffff) != 0)
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break;
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assert (value < nmsgidx);
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break;
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case DWFL_E_ERRNO:
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value = DWFL_E (ERRNO, errno);
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break;
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case DWFL_E_LIBELF:
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value = DWFL_E (LIBELF, elf_errno ());
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break;
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case DWFL_E_LIBDW:
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value = DWFL_E (LIBDW, INTUSE(dwarf_errno) ());
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break;
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#if 0
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DWFL_E_LIBEBL:
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value = DWFL_E (LIBEBL, ebl_errno ());
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break;
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#endif
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}
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return value;
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}
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int
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internal_function
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__libdwfl_canon_error (Dwfl_Error error)
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{
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return canonicalize (error);
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}
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void
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internal_function
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__libdwfl_seterrno (Dwfl_Error error)
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{
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global_error = canonicalize (error);
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}
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const char *
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dwfl_errmsg (int error)
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{
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if (error == 0 || error == -1)
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{
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int last_error = global_error;
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if (error == 0 && last_error == 0)
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return NULL;
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error = last_error;
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global_error = DWFL_E_NOERROR;
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}
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switch (error &~ 0xffff)
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{
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case OTHER_ERROR (ERRNO):
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return strerror_r (error & 0xffff, "bad", 0);
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case OTHER_ERROR (LIBELF):
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return elf_errmsg (error & 0xffff);
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case OTHER_ERROR (LIBDW):
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return INTUSE(dwarf_errmsg) (error & 0xffff);
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#if 0
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case OTHER_ERROR (LIBEBL):
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return ebl_errmsg (error & 0xffff);
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#endif
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}
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return _(&msgstr[msgidx[(unsigned int) error < nmsgidx
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? error : DWFL_E_UNKNOWN_ERROR]]);
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}
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INTDEF (dwfl_errmsg)
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