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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "AbbreviationsMap.h"
#include "DwarfInfo.h"
#include <AK/MemoryStream.h>
namespace Debug::Dwarf {
AbbreviationsMap::AbbreviationsMap(DwarfInfo const& dwarf_info, u32 offset)
: m_dwarf_info(dwarf_info)
, m_offset(offset)
{
populate_map();
}
void AbbreviationsMap::populate_map()
{
InputMemoryStream abbreviation_stream(m_dwarf_info.abbreviation_data());
abbreviation_stream.discard_or_error(m_offset);
while (!abbreviation_stream.eof()) {
size_t abbreviation_code = 0;
abbreviation_stream.read_LEB128_unsigned(abbreviation_code);
// An abbreviation code of 0 marks the end of the
// abbreviations for a given compilation unit
if (abbreviation_code == 0)
break;
size_t tag {};
abbreviation_stream.read_LEB128_unsigned(tag);
u8 has_children = 0;
abbreviation_stream >> has_children;
AbbreviationEntry abbreviation_entry {};
abbreviation_entry.tag = static_cast<EntryTag>(tag);
abbreviation_entry.has_children = (has_children == 1);
AttributeSpecification current_attribute_specification {};
do {
size_t attribute_value = 0;
size_t form_value = 0;
abbreviation_stream.read_LEB128_unsigned(attribute_value);
abbreviation_stream.read_LEB128_unsigned(form_value);
current_attribute_specification.attribute = static_cast<Attribute>(attribute_value);
current_attribute_specification.form = static_cast<AttributeDataForm>(form_value);
if (current_attribute_specification.form == AttributeDataForm::ImplicitConst) {
ssize_t data_value;
abbreviation_stream.read_LEB128_signed(data_value);
current_attribute_specification.value = data_value;
}
if (current_attribute_specification.attribute != Attribute::None) {
abbreviation_entry.attribute_specifications.append(current_attribute_specification);
}
} while (current_attribute_specification.attribute != Attribute::None || current_attribute_specification.form != AttributeDataForm::None);
m_entries.set(static_cast<u32>(abbreviation_code), move(abbreviation_entry));
}
}
AbbreviationsMap::AbbreviationEntry const* AbbreviationsMap::get(u32 code) const
{
auto it = m_entries.find(code);
if (it == m_entries.end()) {
return nullptr;
}
return &it->value;
}
}
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