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/* Return scope DIEs containing PC address.
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Copyright (C) 2005 Red Hat, Inc.
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This file is part of Red Hat elfutils.
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Red Hat elfutils is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by the
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Free Software Foundation; version 2 of the License.
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Red Hat 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 a copy of the GNU General Public License along
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with Red Hat elfutils; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
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In addition, as a special exception, Red Hat, Inc. gives You the
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additional right to link the code of Red Hat elfutils with code licensed
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under any Open Source Initiative certified open source license
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(http://www.opensource.org/licenses/index.php) which requires the
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distribution of source code with any binary distribution and to
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distribute linked combinations of the two. Non-GPL Code permitted under
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this exception must only link to the code of Red Hat elfutils through
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those well defined interfaces identified in the file named EXCEPTION
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found in the source code files (the "Approved Interfaces"). The files
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of Non-GPL Code may instantiate templates or use macros or inline
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functions from the Approved Interfaces without causing the resulting
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work to be covered by the GNU General Public License. Only Red Hat,
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Inc. may make changes or additions to the list of Approved Interfaces.
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Red Hat's grant of this exception is conditioned upon your not adding
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any new exceptions. If you wish to add a new Approved Interface or
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exception, please contact Red Hat. You must obey the GNU General Public
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License in all respects for all of the Red Hat elfutils code and other
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code used in conjunction with Red Hat elfutils except the Non-GPL Code
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covered by this exception. If you modify this file, you may extend this
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exception to your version of the file, but you are not obligated to do
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so. If you do not wish to provide this exception without modification,
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you must delete this exception statement from your version and license
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this file solely under the GPL without exception.
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Red Hat elfutils is an included package of the Open Invention Network.
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An included package of the Open Invention Network is a package for which
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Open Invention Network licensees cross-license their patents. No patent
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license is granted, either expressly or impliedly, by designation as an
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included package. Should you wish to participate in the Open Invention
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Network licensing program, please visit www.openinventionnetwork.com
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<http://www.openinventionnetwork.com>. */
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unsigned int inlined, nscopes;
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Dwarf_Die inlined_origin;
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/* Preorder visitor: prune the traversal if this DIE does not contain PC. */
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pc_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
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if (a->scopes != NULL || INTUSE(dwarf_haspc) (&die->die, a->pc) <= 0)
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else if (INTUSE (dwarf_tag) (&die->die) == DW_TAG_inlined_subroutine)
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/* Preorder visitor for second partial traversal after finding a
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concrete inlined instance. */
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origin_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
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if (die->die.addr != a->inlined_origin.addr)
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/* We have a winner! This is the abstract definition of the inline
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function of which A->scopes[A->nscopes - 1] is a concrete instance.
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unsigned int nscopes = a->nscopes + depth;
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Dwarf_Die *scopes = realloc (a->scopes, nscopes * sizeof scopes[0]);
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__libdw_seterrno (DWARF_E_NOMEM);
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scopes[a->nscopes++] = die->die;
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while (a->nscopes < nscopes);
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assert (die->parent == NULL);
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/* Postorder visitor: first (innermost) call wins. */
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pc_record (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
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struct args *a = arg;
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if (a->scopes == NULL)
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/* We have hit the innermost DIE that contains the target PC. */
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a->nscopes = depth + 1 - a->inlined;
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a->scopes = malloc (a->nscopes * sizeof a->scopes[0]);
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if (a->scopes == NULL)
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__libdw_seterrno (DWARF_E_NOMEM);
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for (unsigned int i = 0; i < a->nscopes; ++i)
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a->scopes[i] = die->die;
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assert (die == NULL);
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/* This is the concrete inlined instance itself.
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Record its abstract_origin pointer. */
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Dwarf_Die *const inlinedie = &a->scopes[depth - a->inlined];
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assert (INTUSE (dwarf_tag) (inlinedie) == DW_TAG_inlined_subroutine);
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Dwarf_Attribute attr_mem;
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Dwarf_Attribute *attr = INTUSE (dwarf_attr) (inlinedie,
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DW_AT_abstract_origin,
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if (INTUSE (dwarf_formref_die) (attr, &a->inlined_origin) == NULL)
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/* We've recorded the scopes back to one that is a concrete inlined
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instance. Now return out of the traversal back to the scope
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containing that instance. */
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if (depth >= a->inlined)
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/* Now we are in a scope that contains the concrete inlined instance.
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Search it for the inline function's abstract definition.
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If we don't find it, return to search the containing scope.
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If we do find it, the nonzero return value will bail us out
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of the postorder traversal. */
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return __libdw_visit_scopes (depth, die, &origin_match, NULL, &a);
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dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc, Dwarf_Die **scopes)
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struct Dwarf_Die_Chain cu = { .parent = NULL, .die = *cudie };
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struct args a = { .pc = pc };
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int result = __libdw_visit_scopes (0, &cu, &pc_match, &pc_record, &a);
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if (result == 0 && a.scopes != NULL)
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result = __libdw_visit_scopes (0, &cu, &origin_match, NULL, &a);
added
removed
libdw/dwarf_getscopes.c
