1 /* Return scope DIEs containing PC address.
2 Copyright (C) 2005, 2007, 2015 Red Hat, Inc.
3 This file is part of elfutils.
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
18 or both in parallel, as here.
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
43 unsigned int inlined, nscopes;
44 Dwarf_Die inlined_origin;
47 /* Preorder visitor: prune the traversal if this DIE does not contain PC. */
49 pc_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
53 if (a->scopes != NULL)
57 /* dwarf_haspc returns an error if there are no appropriate attributes.
58 But we use it indiscriminantly instead of presuming which tags can
59 have PC attributes. So when it fails for that reason, treat it just
60 as a nonmatching return. */
61 int result = INTUSE(dwarf_haspc) (&die->die, a->pc);
64 int error = INTUSE(dwarf_errno) ();
65 if (error != DWARF_E_NOERROR && error != DWARF_E_NO_DEBUG_RANGES)
67 __libdw_seterrno (error);
76 && INTUSE (dwarf_tag) (&die->die) == DW_TAG_inlined_subroutine)
83 /* Preorder visitor for second partial traversal after finding a
84 concrete inlined instance. */
86 origin_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
90 if (die->die.addr != a->inlined_origin.addr)
93 /* We have a winner! This is the abstract definition of the inline
94 function of which A->scopes[A->nscopes - 1] is a concrete instance.
97 unsigned int nscopes = a->nscopes + depth;
98 Dwarf_Die *scopes = realloc (a->scopes, nscopes * sizeof scopes[0]);
102 __libdw_seterrno (DWARF_E_NOMEM);
110 scopes[a->nscopes++] = die->die;
112 while (a->nscopes < nscopes);
113 assert (die->parent == NULL);
117 /* Postorder visitor: first (innermost) call wins. */
119 pc_record (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
121 struct args *a = arg;
126 if (a->scopes == NULL)
128 /* We have hit the innermost DIE that contains the target PC. */
130 a->nscopes = depth + 1 - a->inlined;
131 a->scopes = malloc (a->nscopes * sizeof a->scopes[0]);
132 if (a->scopes == NULL)
134 __libdw_seterrno (DWARF_E_NOMEM);
138 for (unsigned int i = 0; i < a->nscopes; ++i)
140 a->scopes[i] = die->die;
146 assert (die == NULL);
150 /* This is the concrete inlined instance itself.
151 Record its abstract_origin pointer. */
152 Dwarf_Die *const inlinedie = &a->scopes[depth - a->inlined];
154 assert (INTUSE (dwarf_tag) (inlinedie) == DW_TAG_inlined_subroutine);
155 Dwarf_Attribute attr_mem;
156 Dwarf_Attribute *attr = INTUSE (dwarf_attr) (inlinedie,
157 DW_AT_abstract_origin,
159 if (INTUSE (dwarf_formref_die) (attr, &a->inlined_origin) == NULL)
165 /* We've recorded the scopes back to one that is a concrete inlined
166 instance. Now return out of the traversal back to the scope
167 containing that instance. */
170 if (depth >= a->inlined)
174 /* Now we are in a scope that contains the concrete inlined instance.
175 Search it for the inline function's abstract definition.
176 If we don't find it, return to search the containing scope.
177 If we do find it, the nonzero return value will bail us out
178 of the postorder traversal. */
179 return __libdw_visit_scopes (depth, die, NULL, &origin_match, NULL, a);
184 dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc, Dwarf_Die **scopes)
189 struct Dwarf_Die_Chain cu = { .parent = NULL, .die = *cudie };
190 struct args a = { .pc = pc };
192 int result = __libdw_visit_scopes (0, &cu, NULL, &pc_match, &pc_record, &a);
194 if (result == 0 && a.scopes != NULL)
195 result = __libdw_visit_scopes (0, &cu, NULL, &origin_match, NULL, &a);