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LibDebug: Parse DWARF information entries

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We can now iterate the tree structure of the DIEs, access attribute
values and parse some very basic DWARF expressions.
This commit is contained in:
Itamar 2020-05-04 12:14:39 +03:00 • committed by Andreas Kling
parent 2cafc36d9c
commit c5eb20d0cc
14 changed files with 1067 additions and 3 deletions
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69
Libraries/LibDebug/Dwarf/DwarfInfo.cpp Normal file
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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"
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);
ASSERT(!section.is_undefined());
return ByteBuffer::wrap(reinterpret_cast<const u8*>(section.raw_data()), section.size());
}
void DwarfInfo::populate_compilation_units()
{
// We have to const_cast here because there isn't a version of
// BufferStream that accepts a const ByteStream
// We take care not to use BufferStream operations that modify the underlying buffer
// TOOD: Add a variant of BufferStream that operates on a const ByteBuffer to AK
BufferStream stream(const_cast<ByteBuffer&>(m_debug_info_data));
while (!stream.at_end()) {
auto unit_offset = stream.offset();
CompilationUnitHeader compilation_unit_header {};
stream.read_raw(reinterpret_cast<u8*>(&compilation_unit_header), sizeof(CompilationUnitHeader));
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.advance(length_after_header);
}
}
}