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97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* Iterate through modules.
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Copyright (C) 2005, 2008 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 "libdwflP.h"
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ptrdiff_t
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dwfl_getmodules (Dwfl *dwfl,
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int (*callback) (Dwfl_Module *, void **,
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const char *, Dwarf_Addr, void *),
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void *arg,
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ptrdiff_t offset)
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{
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if (dwfl == NULL)
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return -1;
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/* We iterate through the linked list when it's all we have.
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But continuing from an offset is slow that way. So when
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DWFL->lookup_module is populated, we can instead keep our
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place by jumping directly into the array. Since the actions
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of a callback could cause it to get populated, we must
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choose the style of place-holder when we return an offset,
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and we encode the choice in the low bits of that value. */
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Dwfl_Module *m = dwfl->modulelist;
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if ((offset & 3) == 1)
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{
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offset >>= 2;
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for (ptrdiff_t pos = 0; pos < offset; ++pos)
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if (m == NULL)
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return -1;
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else
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m = m->next;
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}
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else if (((offset & 3) == 2) && likely (dwfl->lookup_module != NULL))
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{
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offset >>= 2;
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if ((size_t) offset - 1 == dwfl->lookup_elts)
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return 0;
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if (unlikely ((size_t) offset - 1 > dwfl->lookup_elts))
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return -1;
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m = dwfl->lookup_module[offset - 1];
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if (unlikely (m == NULL))
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return -1;
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}
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else if (offset != 0)
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{
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__libdwfl_seterrno (DWFL_E_BADSTROFF);
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return -1;
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}
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while (m != NULL)
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{
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int ok = (*callback) (MODCB_ARGS (m), arg);
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++offset;
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m = m->next;
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if (ok != DWARF_CB_OK)
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return ((dwfl->lookup_module == NULL) ? ((offset << 2) | 1)
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: (((m == NULL ? (ptrdiff_t) dwfl->lookup_elts + 1
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: m->segment + 1) << 2) | 2));
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}
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return 0;
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}
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INTDEF (dwfl_getmodules)
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