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Libraries: Move to Userland/Libraries/
This commit is contained in:
Andreas Kling
parent
dc28c07fa5
commit
13d7c09125
Notes:
sideshowbarker
2024-07-18 23:53:55 +09:00
Author: https://github.com/awesomekling
Commit: 13d7c09125
1857 changed files with 266 additions and 274 deletions
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@ -1,244 +0,0 @@
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/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "DIE.h"
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#include "CompilationUnit.h"
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#include "DwarfInfo.h"
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#include <AK/ByteBuffer.h>
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#include <AK/MemoryStream.h>
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namespace Debug::Dwarf {
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DIE::DIE(const CompilationUnit& unit, u32 offset)
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: m_compilation_unit(unit)
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, m_offset(offset)
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{
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InputMemoryStream stream(m_compilation_unit.dwarf_info().debug_info_data());
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stream.discard_or_error(m_offset);
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stream.read_LEB128_unsigned(m_abbreviation_code);
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m_data_offset = stream.offset();
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if (m_abbreviation_code == 0) {
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// An abbreviation code of 0 ( = null DIE entry) means the end of a chain of siblings
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m_tag = EntryTag::None;
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} else {
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auto abbreviation_info = m_compilation_unit.abbreviations_map().get(m_abbreviation_code);
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ASSERT(abbreviation_info.has_value());
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m_tag = abbreviation_info.value().tag;
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m_has_children = abbreviation_info.value().has_children;
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// We iterate the attributes data only to calculate this DIE's size
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for (auto& attribute_spec : abbreviation_info.value().attribute_specifications) {
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get_attribute_value(attribute_spec.form, stream);
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}
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}
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m_size = stream.offset() - m_offset;
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}
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DIE::AttributeValue DIE::get_attribute_value(AttributeDataForm form,
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InputMemoryStream& debug_info_stream) const
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{
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AttributeValue value;
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auto assign_raw_bytes_value = [&](size_t length) {
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value.data.as_raw_bytes.length = length;
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value.data.as_raw_bytes.bytes = reinterpret_cast<const u8*>(m_compilation_unit.dwarf_info().debug_info_data().data()
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+ debug_info_stream.offset());
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debug_info_stream.discard_or_error(length);
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};
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switch (form) {
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case AttributeDataForm::StringPointer: {
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u32 offset;
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debug_info_stream >> offset;
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value.type = AttributeValue::Type::String;
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auto strings_data = m_compilation_unit.dwarf_info().debug_strings_data();
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value.data.as_string = reinterpret_cast<const char*>(strings_data.data() + offset);
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break;
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}
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case AttributeDataForm::Data1: {
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u8 data;
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debug_info_stream >> data;
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_u32 = data;
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break;
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}
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case AttributeDataForm::Data2: {
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u16 data;
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debug_info_stream >> data;
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_u32 = data;
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break;
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}
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case AttributeDataForm::Addr: {
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u32 address;
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debug_info_stream >> address;
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_u32 = address;
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break;
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}
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case AttributeDataForm::SData: {
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ssize_t data;
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debug_info_stream.read_LEB128_signed(data);
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value.type = AttributeValue::Type::SignedNumber;
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value.data.as_i32 = data;
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break;
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}
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case AttributeDataForm::SecOffset: {
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u32 data;
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debug_info_stream >> data;
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value.type = AttributeValue::Type::SecOffset;
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value.data.as_u32 = data;
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break;
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}
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case AttributeDataForm::Data4: {
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u32 data;
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debug_info_stream >> data;
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_u32 = data;
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break;
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}
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case AttributeDataForm::Ref4: {
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u32 data;
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debug_info_stream >> data;
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value.type = AttributeValue::Type::DieReference;
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value.data.as_u32 = data + m_compilation_unit.offset();
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break;
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}
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case AttributeDataForm::FlagPresent: {
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value.type = AttributeValue::Type::Boolean;
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value.data.as_bool = true;
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break;
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}
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case AttributeDataForm::ExprLoc: {
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size_t length;
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debug_info_stream.read_LEB128_unsigned(length);
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value.type = AttributeValue::Type::DwarfExpression;
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assign_raw_bytes_value(length);
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break;
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}
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case AttributeDataForm::String: {
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String str;
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u32 str_offset = debug_info_stream.offset();
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debug_info_stream >> str;
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value.type = AttributeValue::Type::String;
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value.data.as_string = reinterpret_cast<const char*>(str_offset + m_compilation_unit.dwarf_info().debug_info_data().data());
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break;
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}
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case AttributeDataForm::Block1: {
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value.type = AttributeValue::Type::RawBytes;
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u8 length;
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debug_info_stream >> length;
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assign_raw_bytes_value(length);
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break;
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}
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case AttributeDataForm::Block2: {
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value.type = AttributeValue::Type::RawBytes;
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u16 length;
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debug_info_stream >> length;
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assign_raw_bytes_value(length);
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break;
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}
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case AttributeDataForm::Block4: {
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value.type = AttributeValue::Type::RawBytes;
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u32 length;
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debug_info_stream >> length;
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assign_raw_bytes_value(length);
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break;
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}
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case AttributeDataForm::Block: {
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value.type = AttributeValue::Type::RawBytes;
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size_t length;
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debug_info_stream.read_LEB128_unsigned(length);
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assign_raw_bytes_value(length);
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break;
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}
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default:
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dbgln("Unimplemented AttributeDataForm: {}", (u32)form);
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ASSERT_NOT_REACHED();
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}
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return value;
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}
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Optional<DIE::AttributeValue> DIE::get_attribute(const Attribute& attribute) const
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{
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InputMemoryStream stream { m_compilation_unit.dwarf_info().debug_info_data() };
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stream.discard_or_error(m_data_offset);
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auto abbreviation_info = m_compilation_unit.abbreviations_map().get(m_abbreviation_code);
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ASSERT(abbreviation_info.has_value());
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for (const auto& attribute_spec : abbreviation_info.value().attribute_specifications) {
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auto value = get_attribute_value(attribute_spec.form, stream);
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if (attribute_spec.attribute == attribute) {
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return value;
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}
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}
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return {};
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}
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void DIE::for_each_child(Function<void(const DIE& child)> callback) const
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{
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if (!m_has_children)
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return;
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NonnullOwnPtr<DIE> current_child = make<DIE>(m_compilation_unit, m_offset + m_size);
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while (true) {
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callback(*current_child);
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if (current_child->is_null())
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break;
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if (!current_child->has_children()) {
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current_child = make<DIE>(m_compilation_unit, current_child->offset() + current_child->size());
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continue;
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}
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auto sibling = current_child->get_attribute(Attribute::Sibling);
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u32 sibling_offset = 0;
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if (sibling.has_value()) {
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sibling_offset = sibling.value().data.as_u32;
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}
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if (!sibling.has_value()) {
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// NOTE: According to the spec, the compiler doesn't have to supply the sibling information.
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// When it doesn't, we have to recursively iterate the current child's children to find where they end
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current_child->for_each_child([&](const DIE& sub_child) {
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sibling_offset = sub_child.offset() + sub_child.size();
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});
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}
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current_child = make<DIE>(m_compilation_unit, sibling_offset);
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}
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}
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DIE DIE::get_die_at_offset(u32 offset) const
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{
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ASSERT(offset >= m_compilation_unit.offset() && offset < m_compilation_unit.offset() + m_compilation_unit.size());
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return DIE(m_compilation_unit, offset);
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}
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}
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