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https://github.com/RGBCube/serenity
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ac53569bd1
These forms were introduced in DWARF5, and have a fair deal of advantages over the more traditional encodings: they reduce the size of the binary and the number of relocations. GCC does not emit these with `-g1` by default, but Clang does at all debug levels.
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CompilationUnit.h"
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#include "DIE.h"
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namespace Debug::Dwarf {
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CompilationUnit::CompilationUnit(DwarfInfo const& dwarf_info, u32 offset, CompilationUnitHeader const& header, NonnullOwnPtr<LineProgram>&& line_program)
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: m_dwarf_info(dwarf_info)
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, m_offset(offset)
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, m_header(header)
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, m_abbreviations(dwarf_info, header.abbrev_offset())
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, m_line_program(move(line_program))
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{
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VERIFY(header.version() < 5 || header.unit_type() == CompilationUnitType::Full);
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}
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DIE CompilationUnit::root_die() const
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{
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return DIE(*this, m_offset + m_header.header_size());
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}
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DIE CompilationUnit::get_die_at_offset(u32 die_offset) const
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{
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VERIFY(die_offset >= offset() && die_offset < offset() + size());
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return DIE(*this, die_offset);
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}
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Optional<FlatPtr> CompilationUnit::base_address() const
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{
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if (m_has_cached_base_address)
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return m_cached_base_address;
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auto die = root_die();
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auto res = die.get_attribute(Attribute::LowPc);
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if (res.has_value()) {
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m_cached_base_address = res->as_addr();
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}
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m_has_cached_base_address = true;
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return m_cached_base_address;
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}
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u64 CompilationUnit::address_table_base() const
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{
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if (m_has_cached_address_table_base)
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return m_cached_address_table_base;
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auto die = root_die();
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auto res = die.get_attribute(Attribute::AddrBase);
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if (res.has_value()) {
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VERIFY(res->form() == AttributeDataForm::SecOffset);
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m_cached_address_table_base = res->as_unsigned();
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}
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m_has_cached_address_table_base = true;
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return m_cached_address_table_base;
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}
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u64 CompilationUnit::string_offsets_base() const
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{
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if (m_has_cached_string_offsets_base)
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return m_cached_string_offsets_base;
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auto die = root_die();
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auto res = die.get_attribute(Attribute::StrOffsetsBase);
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if (res.has_value()) {
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VERIFY(res->form() == AttributeDataForm::SecOffset);
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m_cached_string_offsets_base = res->as_unsigned();
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}
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m_has_cached_string_offsets_base = true;
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return m_cached_string_offsets_base;
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}
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u64 CompilationUnit::range_lists_base() const
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{
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if (m_has_cached_range_lists_base)
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return m_cached_range_lists_base;
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auto die = root_die();
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auto res = die.get_attribute(Attribute::RngListsBase);
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if (res.has_value()) {
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VERIFY(res->form() == AttributeDataForm::SecOffset);
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m_cached_range_lists_base = res->as_unsigned();
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}
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m_has_cached_range_lists_base = true;
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return m_cached_range_lists_base;
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}
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FlatPtr CompilationUnit::get_address(size_t index) const
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{
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auto base = address_table_base();
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auto debug_addr_data = dwarf_info().debug_addr_data();
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VERIFY(base < debug_addr_data.size());
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auto addresses = reinterpret_cast<FlatPtr const*>(debug_addr_data.offset(base));
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VERIFY(base + index * sizeof(FlatPtr) < debug_addr_data.size());
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return addresses[index];
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}
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char const* CompilationUnit::get_string(size_t index) const
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{
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auto base = string_offsets_base();
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auto debug_str_offsets_data = dwarf_info().debug_str_offsets_data();
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VERIFY(base < debug_str_offsets_data.size());
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// FIXME: This assumes DWARF32
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auto offsets = reinterpret_cast<u32 const*>(debug_str_offsets_data.offset(base));
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VERIFY(base + index * sizeof(u32) < debug_str_offsets_data.size());
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auto offset = offsets[index];
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return reinterpret_cast<char const*>(dwarf_info().debug_strings_data().offset(offset));
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}
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}
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