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/*
elfwalk.cpp
This file is part of Hotspot, the Qt GUI for performance analysis.
Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Author: Milian Wolff <milian.wolff@kdab.com>
Licensees holding valid commercial KDAB Hotspot licenses may use this file in
accordance with Hotspot Commercial License Agreement provided with the Software.
Contact info@kdab.com if any conditions of this licensing are not clear to you.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libdwfl.h>
#include <libdw.h>
#include <dwarf.h>
#include <cstdio>
#include <vector>
namespace {
struct DieRanges
{
Dwarf_Die die;
struct Range
{
Range(Dwarf_Addr low, Dwarf_Addr high)
: low(low), high(high)
{}
Dwarf_Addr low = 0;
Dwarf_Addr high = 0;
};
std::vector<Range> ranges;
std::vector<DieRanges> children;
};
// see libdw_visit_scopes.c
bool may_have_scopes(Dwarf_Die *die)
{
switch (dwarf_tag(die))
{
/* DIEs with addresses we can try to match. */
case DW_TAG_compile_unit:
case DW_TAG_module:
case DW_TAG_lexical_block:
case DW_TAG_with_stmt:
case DW_TAG_catch_block:
case DW_TAG_try_block:
case DW_TAG_entry_point:
case DW_TAG_inlined_subroutine:
case DW_TAG_subprogram:
return true;
/* DIEs without addresses that can own DIEs with addresses. */
case DW_TAG_namespace:
case DW_TAG_class_type:
case DW_TAG_structure_type:
return true;
/* Other DIEs we have no reason to descend. */
default:
break;
}
return false;
}
void walk_die(Dwarf_Die *die, DieRanges *parent, int depth)
{
if (!may_have_scopes(die))
return;
if (dwarf_tag(die) == DW_TAG_subprogram) {
DieRanges ranges;
ranges.die = *die;
Dwarf_Addr low = 0;
Dwarf_Addr high = 0;
Dwarf_Addr base = 0;
ptrdiff_t offset = 0;
while ((offset = dwarf_ranges(die, offset, &base, &low, &high)) > 0) {
ranges.ranges.emplace_back(low, high);
printf(" %lx - %lx\n", low, high);
}
if (!ranges.ranges.empty()) {
printf("%6d: %x %s %lx\n", depth, dwarf_tag(die), dwarf_diename(die), dwarf_dieoffset(die));
parent->children.push_back(ranges);
parent = &parent->children.back();
++depth;
}
return;
}
Dwarf_Die childDie;
if (dwarf_child(die, &childDie) == 0) {
walk_die(&childDie, parent, depth);
Dwarf_Die siblingDie;
while (dwarf_siblingof(&childDie, &siblingDie) == 0) {
walk_die(&siblingDie, parent, depth);
childDie = siblingDie;
}
}
}
DieRanges walk_cudie(Dwarf_Die *cudie)
{
DieRanges ranges;
ranges.die = *cudie;
walk_die(cudie, &ranges, 0);
return ranges;
}
void walk_cudies(Dwfl_Module *mod)
{
std::vector<DieRanges> ranges;
Dwarf_Die *cudie = nullptr;
Dwarf_Addr bias = 0;
while ((cudie = dwfl_module_nextcu(mod, cudie, &bias))) {
ranges.emplace_back(walk_cudie(cudie));
}
}
}
int main(int argc, char** argv)
{
if (argc != 2) {
fprintf(stderr, "ERROR: missing <file> arg\n");
return 1;
}
const auto file = argv[1];
Dwfl_Callbacks callbacks = {
&dwfl_build_id_find_elf,
&dwfl_standard_find_debuginfo,
&dwfl_offline_section_address,
nullptr,
};
auto *dwfl = dwfl_begin(&callbacks);
dwfl_report_begin(dwfl);
auto *mod = dwfl_report_elf(dwfl, file, file, -1, 0, false);
if (mod)
walk_cudies(mod);
else
fprintf(stderr, "ERROR: failed to report elf: %s\n", dwfl_errmsg(dwfl_errno()));
dwfl_report_end(dwfl, nullptr, nullptr);
dwfl_end(dwfl);
}
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