TheRock/rocm-systems/projects/rocprofiler-systems/source/lib/binary/dwarf_entry.cpp

// Copyright (c) Advanced Micro Devices, Inc.
// SPDX-License-Identifier: MIT

#include "dwarf_entry.hpp"
#include "common/path.hpp"
#include "core/binary/fwd.hpp"
#include "core/timemory.hpp"
#include "core/utility.hpp"

#include <dwarf.h>
#include <elfutils/libdw.h>

namespace rocprofsys
{
namespace binary
{
namespace
{
using utility::combine;

auto
get_dwarf_address_ranges(Dwarf_Die* _die)
{
    auto _ranges = std::vector<address_range>{};

    if(dwarf_tag(_die) != DW_TAG_compile_unit && dwarf_tag(_die) != DW_TAG_subprogram)
        return _ranges;

    Dwarf_Addr _low_pc;
    Dwarf_Addr _high_pc;
    dwarf_lowpc(_die, &_low_pc);
    dwarf_highpc(_die, &_high_pc);

    if(_low_pc > _high_pc)
    {
        Dwarf_Addr _entry_pc;
        dwarf_entrypc(_die, &_entry_pc);
        if(_entry_pc < _low_pc) _low_pc = _entry_pc;
    }

    if(_low_pc < _high_pc) _ranges.emplace_back(_low_pc, _high_pc);

    Dwarf_Addr _base_addr;
    ptrdiff_t  _offset = 0;
    do
    {
        uintptr_t _low  = 0;
        uintptr_t _high = 0;
        _offset         = dwarf_ranges(_die, _offset, &_base_addr, &_low, &_high);
        if(_low < _high) _ranges.emplace_back(_low, _high);
    } while(_offset > 0);

    return _ranges;
}

auto
get_dwarf_breakpoints(Dwarf_Die* _die)
{
    auto _bkpts = std::vector<uintptr_t>{};

    if(dwarf_tag(_die) != DW_TAG_subprogram) return _bkpts;

    Dwarf_Addr* _pts  = nullptr;
    auto        _npts = dwarf_entry_breakpoints(_die, &_pts);

    if(_npts > 0 && _pts) _bkpts.assign(_pts, _pts + _npts);

    return _bkpts;
}

auto
get_dwarf_entry(Dwarf_Die* _die)
{
    auto _line_info = std::deque<dwarf_entry>{};

    if(dwarf_tag(_die) != DW_TAG_compile_unit) return _line_info;

    Dwarf_Lines* _lines     = nullptr;
    size_t       _num_lines = 0;
    if(dwarf_getsrclines(_die, &_lines, &_num_lines) == 0)
    {
        _line_info.resize(_num_lines);
        for(size_t j = 0; j < _num_lines; ++j)
        {
            auto& itr   = _line_info.at(j);
            auto* _line = dwarf_onesrcline(_lines, j);
            if(_line)
            {
                int       _lineno  = 0;
                uintptr_t _address = 0;
                dwarf_lineno(_line, &_lineno);
                dwarf_linecol(_line, &itr.col);
                dwarf_linebeginstatement(_line, &itr.begin_statement);
                dwarf_lineendsequence(_line, &itr.end_sequence);
                dwarf_lineblock(_line, &itr.line_block);
                dwarf_lineepiloguebegin(_line, &itr.epilogue_begin);
                dwarf_lineprologueend(_line, &itr.prologue_end);
                dwarf_lineisa(_line, &itr.isa);
                dwarf_linediscriminator(_line, &itr.discriminator);
                dwarf_lineaddr(_line, &_address);
                itr.address = address_range{ _address };
                if(_lineno > 0) itr.line = _lineno;
                const auto* _file = dwarf_linesrc(_line, nullptr, nullptr);
                if(!_file) _file = dwarf_diename(_die);
                itr.file = path::realpath(_file);
            }
        }
    }

    return _line_info;
}
}  // namespace

bool
dwarf_entry::operator<(const dwarf_entry& _rhs) const
{
    return std::tie(address, file, line, col, discriminator) <
           std::tie(_rhs.address, _rhs.file, _rhs.line, _rhs.col, _rhs.discriminator);
}

bool
dwarf_entry::operator==(const dwarf_entry& _rhs) const
{
    return std::tie(address, line, col, discriminator, vliw_op_index, isa, file) ==
           std::tie(_rhs.address, _rhs.line, _rhs.col, _rhs.discriminator,
                    _rhs.vliw_op_index, _rhs.isa, _rhs.file);
}

bool
dwarf_entry::operator!=(const dwarf_entry& _rhs) const
{
    return !(*this == _rhs);
}

bool
dwarf_entry::is_valid() const
{
    return (*this != dwarf_entry{} && !file.empty());
}

dwarf_entry::dwarf_tuple_t
dwarf_entry::process_dwarf(int _fd)
{
    auto* _dwarf_v = dwarf_begin(_fd, DWARF_C_READ);
    auto  _data_v  = dwarf_tuple_t{};

    if(_dwarf_v)
    {
        auto& _entries = std::get<0>(_data_v);
        auto& _ranges  = std::get<1>(_data_v);
        auto& _bkpts   = std::get<2>(_data_v);

        size_t    cu_header_size = 0;
        Dwarf_Off cu_off         = 0;
        Dwarf_Off next_cu_off    = 0;
        for(; dwarf_nextcu(_dwarf_v, cu_off, &next_cu_off, &cu_header_size, nullptr,
                           nullptr, nullptr) == 0;
            cu_off = next_cu_off)
        {
            auto cu_die_off = cu_off + cu_header_size;
            auto cu_die     = Dwarf_Die{};
            if(dwarf_offdie(_dwarf_v, cu_die_off, &cu_die) != nullptr)
            {
                Dwarf_Die* _die = &cu_die;
                if(dwarf_tag(_die) == DW_TAG_compile_unit)
                {
                    combine(_entries, get_dwarf_entry(_die));
                    combine(_ranges, get_dwarf_address_ranges(_die));
                }
                else if(dwarf_tag(_die) == DW_TAG_subprogram)
                {
                    combine(_bkpts, get_dwarf_breakpoints(_die));
                    combine(_ranges, get_dwarf_address_ranges(_die));
                }
            }
        }

        dwarf_end(_dwarf_v);
        utility::filter_sort_unique(_entries);
        utility::filter_sort_unique(_ranges);
        utility::filter_sort_unique(_bkpts);
    }

    return _data_v;
}

template <typename ArchiveT>
void
dwarf_entry::serialize(ArchiveT& ar, const unsigned int)
{
#define ROCPROFSYS_SERIALIZE_MEMBER(MEMBER) ar(::tim::cereal::make_nvp(#MEMBER, MEMBER));

    ROCPROFSYS_SERIALIZE_MEMBER(file)
    ROCPROFSYS_SERIALIZE_MEMBER(line)
    ROCPROFSYS_SERIALIZE_MEMBER(col)
    ROCPROFSYS_SERIALIZE_MEMBER(address)
    ROCPROFSYS_SERIALIZE_MEMBER(discriminator)
    // ROCPROFSYS_SERIALIZE_MEMBER(begin_statement)
    // ROCPROFSYS_SERIALIZE_MEMBER(end_sequence)
    // ROCPROFSYS_SERIALIZE_MEMBER(line_block)
    // ROCPROFSYS_SERIALIZE_MEMBER(prologue_end)
    // ROCPROFSYS_SERIALIZE_MEMBER(epilogue_begin)
    // ROCPROFSYS_SERIALIZE_MEMBER(vliw_op_index)
    // ROCPROFSYS_SERIALIZE_MEMBER(isa)
}

template void
dwarf_entry::serialize<cereal::JSONInputArchive>(cereal::JSONInputArchive&,
                                                 const unsigned int);

template void
dwarf_entry::serialize<cereal::MinimalJSONOutputArchive>(
    cereal::MinimalJSONOutputArchive&, const unsigned int);

template void
dwarf_entry::serialize<cereal::PrettyJSONOutputArchive>(cereal::PrettyJSONOutputArchive&,
                                                        const unsigned int);
}  // namespace binary
}  // namespace rocprofsys