mirror of
https://github.com/LadybirdBrowser/ladybird.git
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7eac9fe10e
We can now step into library code in the debugger. Since we now need the whole source code of our libraries (and not just the headers), we clone the whole serenity git repo into /usr/share/serenity.
310 lines
12 KiB
C++
310 lines
12 KiB
C++
/*
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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 "DebugInfo.h"
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#include <AK/QuickSort.h>
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#include <AK/Stream.h>
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#include <LibDebug/Dwarf/CompilationUnit.h>
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#include <LibDebug/Dwarf/DwarfInfo.h>
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#include <LibDebug/Dwarf/Expression.h>
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//#define DEBUG_SPAM
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DebugInfo::DebugInfo(NonnullRefPtr<const ELF::Loader> elf)
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: m_elf(elf)
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, m_dwarf_info(Dwarf::DwarfInfo::create(m_elf))
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{
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prepare_variable_scopes();
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prepare_lines();
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}
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void DebugInfo::prepare_variable_scopes()
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{
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m_dwarf_info->for_each_compilation_unit([&](const Dwarf::CompilationUnit& unit) {
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auto root = unit.root_die();
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parse_scopes_impl(root);
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});
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}
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void DebugInfo::parse_scopes_impl(const Dwarf::DIE& die)
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{
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die.for_each_child([&](const Dwarf::DIE& child) {
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if (child.is_null())
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return;
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if (!(child.tag() == Dwarf::EntryTag::SubProgram || child.tag() == Dwarf::EntryTag::LexicalBlock))
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return;
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if (child.get_attribute(Dwarf::Attribute::Inline).has_value()) {
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#ifdef DEBUG_SPAM
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dbg() << "DWARF inlined functions are not supported";
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#endif
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return;
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}
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if (child.get_attribute(Dwarf::Attribute::Ranges).has_value()) {
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#ifdef DEBUG_SPAM
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dbg() << "DWARF ranges are not supported";
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#endif
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return;
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}
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auto name = child.get_attribute(Dwarf::Attribute::Name);
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VariablesScope scope {};
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scope.is_function = (child.tag() == Dwarf::EntryTag::SubProgram);
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if (name.has_value())
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scope.name = name.value().data.as_string;
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if (!child.get_attribute(Dwarf::Attribute::LowPc).has_value()) {
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#ifdef DEBUG_SPAM
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dbg() << "DWARF: Couldn't find attribtue LowPc for scope";
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#endif
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return;
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}
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scope.address_low = child.get_attribute(Dwarf::Attribute::LowPc).value().data.as_u32;
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// The attribute name HighPc is confusing. In this context, it seems to actually be a positive offset from LowPc
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scope.address_high = scope.address_low + child.get_attribute(Dwarf::Attribute::HighPc).value().data.as_u32;
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child.for_each_child([&](const Dwarf::DIE& variable_entry) {
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if (!(variable_entry.tag() == Dwarf::EntryTag::Variable
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|| variable_entry.tag() == Dwarf::EntryTag::FormalParameter))
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return;
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scope.dies_of_variables.append(variable_entry);
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});
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m_scopes.append(scope);
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parse_scopes_impl(child);
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});
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}
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void DebugInfo::prepare_lines()
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{
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auto section = m_elf->image().lookup_section(".debug_line");
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if (section.is_undefined())
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return;
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auto buffer = section.wrapping_byte_buffer();
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InputMemoryStream stream { buffer.span() };
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Vector<LineProgram::LineInfo> all_lines;
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while (!stream.eof()) {
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LineProgram program(stream);
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all_lines.append(program.lines());
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}
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for (auto& line_info : all_lines) {
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String file_path = line_info.file;
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if (file_path.contains("Toolchain/") || file_path.contains("libgcc"))
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continue;
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if (file_path.contains("serenity/")) {
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auto start_index = file_path.index_of("serenity/").value() + String("serenity/").length();
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file_path = file_path.substring(start_index, file_path.length() - start_index);
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}
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m_sorted_lines.append({ line_info.address, file_path, line_info.line });
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}
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quick_sort(m_sorted_lines, [](auto& a, auto& b) {
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return a.address < b.address;
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});
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}
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Optional<DebugInfo::SourcePosition> DebugInfo::get_source_position(u32 target_address) const
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{
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if (m_sorted_lines.is_empty())
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return {};
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if (target_address < m_sorted_lines[0].address)
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return {};
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// TODO: We can do a binray search here
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for (size_t i = 0; i < m_sorted_lines.size() - 1; ++i) {
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if (m_sorted_lines[i + 1].address > target_address) {
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return Optional<SourcePosition>({ m_sorted_lines[i].file, m_sorted_lines[i].line, m_sorted_lines[i].address });
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}
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}
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return {};
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}
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Optional<u32> DebugInfo::get_instruction_from_source(const String& file, size_t line) const
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{
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String file_path = file;
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constexpr char SERENITY_LIBS_PREFIX[] = "/usr/src/serenity";
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if (file.starts_with(SERENITY_LIBS_PREFIX)) {
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file_path = file.substring(sizeof(SERENITY_LIBS_PREFIX), file.length() - sizeof(SERENITY_LIBS_PREFIX));
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file_path = String::format("../%s", file_path.characters());
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}
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for (const auto& line_entry : m_sorted_lines) {
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if (line_entry.file == file_path && line_entry.line == line)
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return Optional<u32>(line_entry.address);
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}
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return {};
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}
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NonnullOwnPtrVector<DebugInfo::VariableInfo> DebugInfo::get_variables_in_current_scope(const PtraceRegisters& regs) const
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{
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NonnullOwnPtrVector<DebugInfo::VariableInfo> variables;
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// TODO: We can store the scopes in a better data strucutre
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for (const auto& scope : m_scopes) {
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if (regs.eip < scope.address_low || regs.eip >= scope.address_high)
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continue;
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for (const auto& die_entry : scope.dies_of_variables) {
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auto variable_info = create_variable_info(die_entry, regs);
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if (!variable_info)
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continue;
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variables.append(variable_info.release_nonnull());
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}
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}
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return variables;
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}
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static Optional<Dwarf::DIE> parse_variable_type_die(const Dwarf::DIE& variable_die, DebugInfo::VariableInfo& variable_info)
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{
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auto type_die_offset = variable_die.get_attribute(Dwarf::Attribute::Type);
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if (!type_die_offset.has_value())
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return {};
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ASSERT(type_die_offset.value().type == Dwarf::DIE::AttributeValue::Type::DieReference);
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auto type_die = variable_die.get_die_at_offset(type_die_offset.value().data.as_u32);
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auto type_name = type_die.get_attribute(Dwarf::Attribute::Name);
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if (type_name.has_value()) {
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variable_info.type_name = type_name.value().data.as_string;
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} else {
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dbg() << "Unnamed DWARF type at offset: " << type_die.offset();
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variable_info.name = "[Unnamed Type]";
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}
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return type_die;
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}
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static void parse_variable_location(const Dwarf::DIE& variable_die, DebugInfo::VariableInfo& variable_info, const PtraceRegisters& regs)
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{
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auto location_info = variable_die.get_attribute(Dwarf::Attribute::Location);
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if (!location_info.has_value())
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location_info = variable_die.get_attribute(Dwarf::Attribute::MemberLocation);
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if (location_info.has_value()) {
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if (location_info.value().type == Dwarf::DIE::AttributeValue::Type::UnsignedNumber) {
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variable_info.location_type = DebugInfo::VariableInfo::LocationType::Address;
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variable_info.location_data.address = location_info.value().data.as_u32;
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}
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if (location_info.value().type == Dwarf::DIE::AttributeValue::Type::DwarfExpression) {
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auto expression_bytes = ReadonlyBytes { location_info.value().data.as_raw_bytes.bytes, location_info.value().data.as_raw_bytes.length };
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auto value = Dwarf::Expression::evaluate(expression_bytes, regs);
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if (value.type != Dwarf::Expression::Type::None) {
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ASSERT(value.type == Dwarf::Expression::Type::UnsignedIntetger);
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variable_info.location_type = DebugInfo::VariableInfo::LocationType::Address;
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variable_info.location_data.address = value.data.as_u32;
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}
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}
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}
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}
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OwnPtr<DebugInfo::VariableInfo> DebugInfo::create_variable_info(const Dwarf::DIE& variable_die, const PtraceRegisters& regs) const
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{
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ASSERT(variable_die.tag() == Dwarf::EntryTag::Variable
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|| variable_die.tag() == Dwarf::EntryTag::Member
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|| variable_die.tag() == Dwarf::EntryTag::FormalParameter
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|| variable_die.tag() == Dwarf::EntryTag::EnumerationType
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|| variable_die.tag() == Dwarf::EntryTag::Enumerator
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|| variable_die.tag() == Dwarf::EntryTag::StructureType);
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if (variable_die.tag() == Dwarf::EntryTag::FormalParameter
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&& !variable_die.get_attribute(Dwarf::Attribute::Name).has_value()) {
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// We don't want to display info for unused paramters
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return {};
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}
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NonnullOwnPtr<VariableInfo> variable_info = make<VariableInfo>();
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variable_info->name = variable_die.get_attribute(Dwarf::Attribute::Name).value().data.as_string;
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auto type_die = parse_variable_type_die(variable_die, *variable_info);
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if (variable_die.tag() == Dwarf::EntryTag::Enumerator) {
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auto constant = variable_die.get_attribute(Dwarf::Attribute::ConstValue);
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ASSERT(constant.has_value());
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switch (constant.value().type) {
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case Dwarf::DIE::AttributeValue::Type::UnsignedNumber:
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variable_info->constant_data.as_u32 = constant.value().data.as_u32;
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break;
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case Dwarf::DIE::AttributeValue::Type::SignedNumber:
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variable_info->constant_data.as_i32 = constant.value().data.as_i32;
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break;
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case Dwarf::DIE::AttributeValue::Type::String:
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variable_info->constant_data.as_string = constant.value().data.as_string;
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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} else {
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parse_variable_location(variable_die, *variable_info, regs);
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}
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if (type_die.has_value()) {
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OwnPtr<VariableInfo> type_info;
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if (type_die.value().tag() == Dwarf::EntryTag::EnumerationType || type_die.value().tag() == Dwarf::EntryTag::StructureType) {
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type_info = create_variable_info(type_die.value(), regs);
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}
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type_die.value().for_each_child([&](const Dwarf::DIE& member) {
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if (member.is_null())
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return;
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auto member_variable = create_variable_info(member, regs);
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ASSERT(member_variable);
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if (type_die.value().tag() == Dwarf::EntryTag::EnumerationType) {
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member_variable->parent = type_info.ptr();
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type_info->members.append(member_variable.release_nonnull());
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} else {
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ASSERT(variable_info->location_type == DebugInfo::VariableInfo::LocationType::Address);
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if (member_variable->location_type == DebugInfo::VariableInfo::LocationType::Address)
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member_variable->location_data.address += variable_info->location_data.address;
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member_variable->parent = variable_info.ptr();
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variable_info->members.append(member_variable.release_nonnull());
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}
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});
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if (type_info) {
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variable_info->type = move(type_info);
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variable_info->type->type_tag = type_die.value().tag();
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}
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}
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return variable_info;
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}
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String DebugInfo::name_of_containing_function(u32 address) const
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{
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for (const auto& scope : m_scopes) {
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if (!scope.is_function || address < scope.address_low || address >= scope.address_high)
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continue;
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return scope.name;
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}
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return {};
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}
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