mirror of
https://github.com/RGBCube/serenity
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6d64b13a1b
And limit the `void*` to the functions that interface the system (i.e. ptrace wrappers). This generally makes the code less riddled with casts.
78 lines
2.5 KiB
C++
78 lines
2.5 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 "AbbreviationsMap.h"
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#include "DwarfInfo.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();
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}
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void AbbreviationsMap::populate_map()
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{
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InputMemoryStream abbreviation_stream(m_dwarf_info.abbreviation_data());
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abbreviation_stream.discard_or_error(m_offset);
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while (!abbreviation_stream.eof()) {
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size_t abbreviation_code = 0;
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abbreviation_stream.read_LEB128_unsigned(abbreviation_code);
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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 {};
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abbreviation_stream.read_LEB128_unsigned(tag);
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u8 has_children = 0;
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abbreviation_stream >> has_children;
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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 = 0;
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size_t form_value = 0;
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abbreviation_stream.read_LEB128_unsigned(attribute_value);
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abbreviation_stream.read_LEB128_unsigned(form_value);
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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;
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abbreviation_stream.read_LEB128_signed(data_value);
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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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}
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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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