mirror of
https://github.com/RGBCube/serenity
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6f6a2dc319
This fixes a bug where we previously would hang if we couldn't find a library containing the current program counter.
71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "BacktraceModel.h"
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#include "Debugger.h"
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#include <LibDebug/StackFrameUtils.h>
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namespace HackStudio {
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NonnullRefPtr<BacktraceModel> BacktraceModel::create(Debug::ProcessInspector const& inspector, PtraceRegisters const& regs)
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{
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return adopt_ref(*new BacktraceModel(create_backtrace(inspector, regs)));
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}
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GUI::Variant BacktraceModel::data(const GUI::ModelIndex& index, GUI::ModelRole role) const
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{
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if (role == GUI::ModelRole::Display) {
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auto& frame = m_frames.at(index.row());
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return frame.function_name;
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}
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return {};
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}
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GUI::ModelIndex BacktraceModel::index(int row, int column, const GUI::ModelIndex&) const
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{
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if (row < 0 || row >= static_cast<int>(m_frames.size()))
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return {};
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return create_index(row, column, &m_frames.at(row));
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}
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Vector<BacktraceModel::FrameInfo> BacktraceModel::create_backtrace(Debug::ProcessInspector const& inspector, PtraceRegisters const& regs)
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{
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FlatPtr current_frame_pointer = regs.bp();
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FlatPtr current_program_counter = regs.ip();
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Vector<BacktraceModel::FrameInfo> frames;
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size_t frame_index = 0;
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do {
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auto lib = inspector.library_at(current_program_counter);
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if (lib) {
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// After the first frame, current_instruction holds the return address from the function call.
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// We need to go back to the 'call' instruction to get accurate source position information.
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if (frame_index > 0)
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--current_program_counter;
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ByteString name = lib->debug_info->elf().symbolicate(current_program_counter - lib->base_address);
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if (name.is_empty()) {
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dbgln("BacktraceModel: couldn't find containing function for address: {:p} (library={})", current_program_counter, lib->name);
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name = "<missing>";
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}
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auto source_position = lib->debug_info->get_source_position(current_program_counter - lib->base_address);
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frames.append({ name, current_program_counter, current_frame_pointer, source_position });
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} else {
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dbgln("BacktraceModel: couldn't find containing library for address: {:p}", current_program_counter);
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frames.append({ "<missing>", current_program_counter, current_frame_pointer, {} });
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}
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auto frame_info = Debug::StackFrameUtils::get_info(inspector, current_frame_pointer);
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VERIFY(frame_info.has_value());
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current_program_counter = frame_info.value().return_address;
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current_frame_pointer = frame_info.value().next_ebp;
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++frame_index;
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} while (current_frame_pointer && current_program_counter);
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return frames;
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}
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}
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