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76 lines
2.6 KiB
C++
76 lines
2.6 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 "AbbreviationsMap.h"
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#include "DwarfInfo.h"
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#include <AK/LEB128.h>
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#include <AK/MemoryStream.h>
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namespace Debug::Dwarf {
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AbbreviationsMap::AbbreviationsMap(DwarfInfo const& dwarf_info, u32 offset)
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: m_dwarf_info(dwarf_info)
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, m_offset(offset)
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{
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populate_map().release_value_but_fixme_should_propagate_errors();
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}
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ErrorOr<void> AbbreviationsMap::populate_map()
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{
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FixedMemoryStream abbreviation_stream { m_dwarf_info.abbreviation_data() };
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TRY(abbreviation_stream.discard(m_offset));
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while (!abbreviation_stream.is_eof()) {
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size_t abbreviation_code = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
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// An abbreviation code of 0 marks the end of the
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// abbreviations for a given compilation unit
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if (abbreviation_code == 0)
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break;
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size_t tag = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
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auto has_children = TRY(abbreviation_stream.read_value<u8>());
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AbbreviationEntry abbreviation_entry {};
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abbreviation_entry.tag = static_cast<EntryTag>(tag);
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abbreviation_entry.has_children = (has_children == 1);
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AttributeSpecification current_attribute_specification {};
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do {
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size_t attribute_value = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
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size_t form_value = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
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current_attribute_specification.attribute = static_cast<Attribute>(attribute_value);
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current_attribute_specification.form = static_cast<AttributeDataForm>(form_value);
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if (current_attribute_specification.form == AttributeDataForm::ImplicitConst) {
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ssize_t data_value = TRY(abbreviation_stream.read_value<LEB128<ssize_t>>());
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current_attribute_specification.value = data_value;
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}
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if (current_attribute_specification.attribute != Attribute::None) {
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abbreviation_entry.attribute_specifications.append(current_attribute_specification);
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}
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} while (current_attribute_specification.attribute != Attribute::None || current_attribute_specification.form != AttributeDataForm::None);
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m_entries.set(static_cast<u32>(abbreviation_code), move(abbreviation_entry));
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}
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return {};
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}
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AbbreviationsMap::AbbreviationEntry const* AbbreviationsMap::get(u32 code) const
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{
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auto it = m_entries.find(code);
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if (it == m_entries.end()) {
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return nullptr;
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}
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return &it->value;
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}
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}
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