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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "DwarfInfo.h"
#include <AK/Stream.h>
namespace Dwarf {
DwarfInfo::DwarfInfo(NonnullRefPtr<const ELF::Loader> elf)
: m_elf(elf)
{
m_debug_info_data = section_data(".debug_info");
m_abbreviation_data = section_data(".debug_abbrev");
m_debug_strings_data = section_data(".debug_str");
populate_compilation_units();
}
ByteBuffer DwarfInfo::section_data(const String& section_name)
{
auto section = m_elf->image().lookup_section(section_name);
if (section.is_undefined())
return {};
return section.wrapping_byte_buffer();
}
void DwarfInfo::populate_compilation_units()
{
if (m_debug_info_data.is_null())
return;
InputMemoryStream stream(m_debug_info_data.span());
while (!stream.eof()) {
auto unit_offset = stream.offset();
CompilationUnitHeader compilation_unit_header {};
stream >> Bytes { &compilation_unit_header, sizeof(compilation_unit_header) };
ASSERT(compilation_unit_header.address_size == sizeof(u32));
ASSERT(compilation_unit_header.version == 4);
u32 length_after_header = compilation_unit_header.length - (sizeof(CompilationUnitHeader) - offsetof(CompilationUnitHeader, version));
m_compilation_units.empend(*this, unit_offset, compilation_unit_header);
stream.discard_or_error(length_after_header);
}
}
}
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