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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "BacktraceModel.h"
#include "Debugger.h"
#include <LibDebug/StackFrameUtils.h>
namespace HackStudio {
NonnullRefPtr<BacktraceModel> BacktraceModel::create(Debug::ProcessInspector const& inspector, PtraceRegisters const& regs)
{
return adopt_ref(*new BacktraceModel(create_backtrace(inspector, regs)));
}
GUI::Variant BacktraceModel::data(const GUI::ModelIndex& index, GUI::ModelRole role) const
{
if (role == GUI::ModelRole::Display) {
auto& frame = m_frames.at(index.row());
return frame.function_name;
}
return {};
}
GUI::ModelIndex BacktraceModel::index(int row, int column, const GUI::ModelIndex&) const
{
if (row < 0 || row >= static_cast<int>(m_frames.size()))
return {};
return create_index(row, column, &m_frames.at(row));
}
Vector<BacktraceModel::FrameInfo> BacktraceModel::create_backtrace(Debug::ProcessInspector const& inspector, PtraceRegisters const& regs)
{
FlatPtr current_ebp = regs.bp();
FlatPtr current_instruction = regs.ip();
Vector<BacktraceModel::FrameInfo> frames;
size_t frame_index = 0;
do {
auto lib = inspector.library_at(current_instruction);
if (!lib)
continue;
// After the first frame, current_instruction holds the return address from the function call.
// We need to go back to the 'call' instruction to get accurate source position information.
if (frame_index > 0)
--current_instruction;
String name = lib->debug_info->elf().symbolicate(current_instruction - lib->base_address);
if (name.is_null()) {
dbgln("BacktraceModel: couldn't find containing function for address: {:p} (library={})", current_instruction, lib->name);
name = "<missing>";
}
auto source_position = lib->debug_info->get_source_position(current_instruction - lib->base_address);
frames.append({ name, current_instruction, current_ebp, source_position });
auto frame_info = Debug::StackFrameUtils::get_info(inspector, current_ebp);
VERIFY(frame_info.has_value());
current_instruction = frame_info.value().return_address;
current_ebp = frame_info.value().next_ebp;
++frame_index;
} while (current_ebp && current_instruction);
return frames;
}
}
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