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119 lines
3.3 KiB
119 lines
3.3 KiB
4 months ago
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/* Get function information.
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Copyright (C) 2005, 2013, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2005.
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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 <dwarf.h>
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#include "libdwP.h"
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struct visitor_info
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{
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/* The user callback of dwarf_getfuncs. */
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int (*callback) (Dwarf_Die *, void *);
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/* The user arg value to dwarf_getfuncs. */
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void *arg;
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/* Addr of the DIE offset where to (re)start the search. Zero for all. */
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void *start_addr;
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/* Last subprogram DIE addr seen. */
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void *last_addr;
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/* The CU only contains C functions. Allows pruning of most subtrees. */
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bool c_cu;
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};
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static int
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tree_visitor (unsigned int depth __attribute__ ((unused)),
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struct Dwarf_Die_Chain *chain, void *arg)
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{
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struct visitor_info *const v = arg;
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Dwarf_Die *die = &chain->die;
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void *start_addr = v->start_addr;
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void *die_addr = die->addr;
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/* Pure C CUs can only contain defining subprogram DIEs as direct
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children of the CU DIE or as nested function inside a normal C
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code constructs. */
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int tag = INTUSE(dwarf_tag) (die);
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if (v->c_cu
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&& tag != DW_TAG_subprogram
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&& tag != DW_TAG_lexical_block
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&& tag != DW_TAG_inlined_subroutine)
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{
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chain->prune = true;
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return DWARF_CB_OK;
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}
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/* Skip all DIEs till we found the (re)start addr. */
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if (start_addr != NULL)
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{
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if (die_addr == start_addr)
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v->start_addr = NULL;
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return DWARF_CB_OK;
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}
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/* If this isn't a (defining) subprogram entity, skip DIE. */
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if (tag != DW_TAG_subprogram
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|| INTUSE(dwarf_hasattr) (die, DW_AT_declaration))
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return DWARF_CB_OK;
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v->last_addr = die_addr;
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return (*v->callback) (die, v->arg);
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}
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ptrdiff_t
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dwarf_getfuncs (Dwarf_Die *cudie, int (*callback) (Dwarf_Die *, void *),
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void *arg, ptrdiff_t offset)
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{
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if (unlikely (cudie == NULL
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|| INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit))
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return -1;
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int lang = INTUSE(dwarf_srclang) (cudie);
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bool c_cu = (lang == DW_LANG_C89
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|| lang == DW_LANG_C
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|| lang == DW_LANG_C99
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|| lang == DW_LANG_C11);
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struct visitor_info v = { callback, arg, (void *) offset, NULL, c_cu };
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struct Dwarf_Die_Chain chain = { .die = CUDIE (cudie->cu),
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.parent = NULL };
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int res = __libdw_visit_scopes (0, &chain, NULL, &tree_visitor, NULL, &v);
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if (res == DWARF_CB_ABORT)
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return (ptrdiff_t) v.last_addr;
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else
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return res;
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}
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