1 /* Return scope DIEs containing PC address.
2 Copyright (C) 2005, 2007 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
5 Red Hat elfutils is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by the
7 Free Software Foundation; version 2 of the License.
9 Red Hat elfutils is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with Red Hat elfutils; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18 In addition, as a special exception, Red Hat, Inc. gives You the
19 additional right to link the code of Red Hat elfutils with code licensed
20 under any Open Source Initiative certified open source license
21 (http://www.opensource.org/licenses/index.php) which requires the
22 distribution of source code with any binary distribution and to
23 distribute linked combinations of the two. Non-GPL Code permitted under
24 this exception must only link to the code of Red Hat elfutils through
25 those well defined interfaces identified in the file named EXCEPTION
26 found in the source code files (the "Approved Interfaces"). The files
27 of Non-GPL Code may instantiate templates or use macros or inline
28 functions from the Approved Interfaces without causing the resulting
29 work to be covered by the GNU General Public License. Only Red Hat,
30 Inc. may make changes or additions to the list of Approved Interfaces.
31 Red Hat's grant of this exception is conditioned upon your not adding
32 any new exceptions. If you wish to add a new Approved Interface or
33 exception, please contact Red Hat. You must obey the GNU General Public
34 License in all respects for all of the Red Hat elfutils code and other
35 code used in conjunction with Red Hat elfutils except the Non-GPL Code
36 covered by this exception. If you modify this file, you may extend this
37 exception to your version of the file, but you are not obligated to do
38 so. If you do not wish to provide this exception without modification,
39 you must delete this exception statement from your version and license
40 this file solely under the GPL without exception.
42 Red Hat elfutils is an included package of the Open Invention Network.
43 An included package of the Open Invention Network is a package for which
44 Open Invention Network licensees cross-license their patents. No patent
45 license is granted, either expressly or impliedly, by designation as an
46 included package. Should you wish to participate in the Open Invention
47 Network licensing program, please visit www.openinventionnetwork.com
48 <http://www.openinventionnetwork.com>. */
64 unsigned int inlined, nscopes;
65 Dwarf_Die inlined_origin;
68 /* Preorder visitor: prune the traversal if this DIE does not contain PC. */
70 pc_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
74 if (a->scopes != NULL)
78 /* dwarf_haspc returns an error if there are no appropriate attributes.
79 But we use it indiscriminantly instead of presuming which tags can
80 have PC attributes. So when it fails for that reason, treat it just
81 as a nonmatching return. */
82 int result = INTUSE(dwarf_haspc) (&die->die, a->pc);
85 int error = INTUSE(dwarf_errno) ();
86 if (error != DWARF_E_NOERROR && error != DWARF_E_NO_DEBUG_RANGES)
88 __libdw_seterrno (error);
97 && INTUSE (dwarf_tag) (&die->die) == DW_TAG_inlined_subroutine)
104 /* Preorder visitor for second partial traversal after finding a
105 concrete inlined instance. */
107 origin_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
109 struct args *a = arg;
111 if (die->die.addr != a->inlined_origin.addr)
114 /* We have a winner! This is the abstract definition of the inline
115 function of which A->scopes[A->nscopes - 1] is a concrete instance.
118 unsigned int nscopes = a->nscopes + depth;
119 Dwarf_Die *scopes = realloc (a->scopes, nscopes * sizeof scopes[0]);
123 __libdw_seterrno (DWARF_E_NOMEM);
131 scopes[a->nscopes++] = die->die;
133 while (a->nscopes < nscopes);
134 assert (die->parent == NULL);
138 /* Postorder visitor: first (innermost) call wins. */
140 pc_record (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
142 struct args *a = arg;
147 if (a->scopes == NULL)
149 /* We have hit the innermost DIE that contains the target PC. */
151 a->nscopes = depth + 1 - a->inlined;
152 a->scopes = malloc (a->nscopes * sizeof a->scopes[0]);
153 if (a->scopes == NULL)
155 __libdw_seterrno (DWARF_E_NOMEM);
159 for (unsigned int i = 0; i < a->nscopes; ++i)
161 a->scopes[i] = die->die;
167 assert (die == NULL);
171 /* This is the concrete inlined instance itself.
172 Record its abstract_origin pointer. */
173 Dwarf_Die *const inlinedie = &a->scopes[depth - a->inlined];
175 assert (INTUSE (dwarf_tag) (inlinedie) == DW_TAG_inlined_subroutine);
176 Dwarf_Attribute attr_mem;
177 Dwarf_Attribute *attr = INTUSE (dwarf_attr) (inlinedie,
178 DW_AT_abstract_origin,
180 if (INTUSE (dwarf_formref_die) (attr, &a->inlined_origin) == NULL)
186 /* We've recorded the scopes back to one that is a concrete inlined
187 instance. Now return out of the traversal back to the scope
188 containing that instance. */
191 if (depth >= a->inlined)
195 /* Now we are in a scope that contains the concrete inlined instance.
196 Search it for the inline function's abstract definition.
197 If we don't find it, return to search the containing scope.
198 If we do find it, the nonzero return value will bail us out
199 of the postorder traversal. */
200 return __libdw_visit_scopes (depth, die, &origin_match, NULL, a);
205 dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc, Dwarf_Die **scopes)
210 struct Dwarf_Die_Chain cu = { .parent = NULL, .die = *cudie };
211 struct args a = { .pc = pc };
213 int result = __libdw_visit_scopes (0, &cu, &pc_match, &pc_record, &a);
215 if (result == 0 && a.scopes != NULL)
216 result = __libdw_visit_scopes (0, &cu, &origin_match, NULL, &a);