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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "CompilationUnit.h"
#include <AK/ByteReader.h>
#include <LibDebug/Dwarf/DIE.h>
#include <LibDebug/Dwarf/DwarfInfo.h>
#include <LibDebug/Dwarf/LineProgram.h>
namespace Debug::Dwarf {
CompilationUnit::CompilationUnit(DwarfInfo const& dwarf_info, u32 offset, CompilationUnitHeader const& header, NonnullOwnPtr<LineProgram>&& line_program)
: m_dwarf_info(dwarf_info)
, m_offset(offset)
, m_header(header)
, m_abbreviations(dwarf_info, header.abbrev_offset())
, m_line_program(move(line_program))
{
VERIFY(header.version() < 5 || header.unit_type() == CompilationUnitType::Full);
}
CompilationUnit::~CompilationUnit() = default;
DIE CompilationUnit::root_die() const
{
return DIE(*this, m_offset + m_header.header_size());
}
DIE CompilationUnit::get_die_at_offset(u32 die_offset) const
{
VERIFY(die_offset >= offset() && die_offset < offset() + size());
return DIE(*this, die_offset);
}
LineProgram const& CompilationUnit::line_program() const
{
return *m_line_program;
}
ErrorOr<Optional<FlatPtr>> CompilationUnit::base_address() const
{
if (m_has_cached_base_address)
return m_cached_base_address;
auto die = root_die();
auto res = TRY(die.get_attribute(Attribute::LowPc));
if (res.has_value()) {
m_cached_base_address = TRY(res->as_addr());
}
m_has_cached_base_address = true;
return m_cached_base_address;
}
ErrorOr<u64> CompilationUnit::address_table_base() const
{
if (m_has_cached_address_table_base)
return m_cached_address_table_base;
auto die = root_die();
auto res = TRY(die.get_attribute(Attribute::AddrBase));
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_address_table_base = res->as_unsigned();
}
m_has_cached_address_table_base = true;
return m_cached_address_table_base;
}
ErrorOr<u64> CompilationUnit::string_offsets_base() const
{
if (m_has_cached_string_offsets_base)
return m_cached_string_offsets_base;
auto die = root_die();
auto res = TRY(die.get_attribute(Attribute::StrOffsetsBase));
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_string_offsets_base = res->as_unsigned();
}
m_has_cached_string_offsets_base = true;
return m_cached_string_offsets_base;
}
ErrorOr<u64> CompilationUnit::range_lists_base() const
{
if (m_has_cached_range_lists_base)
return m_cached_range_lists_base;
auto die = root_die();
auto res = TRY(die.get_attribute(Attribute::RngListsBase));
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_range_lists_base = res->as_unsigned();
}
m_has_cached_range_lists_base = true;
return m_cached_range_lists_base;
}
ErrorOr<FlatPtr> CompilationUnit::get_address(size_t index) const
{
auto base = TRY(address_table_base());
auto debug_addr_data = dwarf_info().debug_addr_data();
VERIFY(base < debug_addr_data.size());
auto addresses = debug_addr_data.slice(base);
VERIFY(index * sizeof(FlatPtr) < addresses.size());
FlatPtr value { 0 };
ByteReader::load<FlatPtr>(addresses.offset_pointer(index * sizeof(FlatPtr)), value);
return value;
}
ErrorOr<char const*> CompilationUnit::get_string(size_t index) const
{
auto base = TRY(string_offsets_base());
auto debug_str_offsets_data = dwarf_info().debug_str_offsets_data();
VERIFY(base < debug_str_offsets_data.size());
// FIXME: This assumes DWARF32
auto offsets = debug_str_offsets_data.slice(base);
VERIFY(index * sizeof(u32) < offsets.size());
auto offset = ByteReader::load32(offsets.offset_pointer(index * sizeof(u32)));
return bit_cast<char const*>(dwarf_info().debug_strings_data().offset(offset));
}
}
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