RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-10-31 20:52:45 +00:00
Code Issues Activity Actions

LibDebug: Parse DWARF information entries

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

69
Libraries/LibDebug/Dwarf/DwarfInfo.cpp Normal file
View file

@ -0,0 +1,69 @@
/*
* 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);
}
}
}