threads and frames

src/backend/backend.cpp

@@ -24,4 +24,30 @@ void Backend::send_reg_change(BackToFront::RegsChanged &&info)
 	auto msg = std::make_unique<BackToFront::Msg>(
 	  BackToFront::MsgType::regs_changed, std::move(info));
 	this->send_msg(std::move(msg));
+}
+
+void Backend::send_thread_change(BackToFront::ThreadChange &&info)
+{
+	auto msg = std::make_unique<BackToFront::Msg>(
+	  BackToFront::MsgType::thread_changed, std::move(info));
+	this->send_msg(std::move(msg));
+}
+void Backend::send_thread_removed(BackToFront::ThreadRemoved &&info)
+{
+	auto msg = std::make_unique<BackToFront::Msg>(
+	  BackToFront::MsgType::thread_removed, std::move(info));
+	this->send_msg(std::move(msg));
+}
+
+void Backend::send_frame_changed(BackToFront::FrameChanged &&info)
+{
+	auto msg = std::make_unique<BackToFront::Msg>(
+	  BackToFront::MsgType::frame_changed, std::move(info));
+	this->send_msg(std::move(msg));
+}
+void Backend::send_frame_removed(BackToFront::FrameRemoved &&info)
+{
+	auto msg = std::make_unique<BackToFront::Msg>(
+	  BackToFront::MsgType::frame_removed, std::move(info));
+	this->send_msg(std::move(msg));
 }

src/backend/debug_backend.h

@@ -23,6 +23,9 @@ namespace dbgui::backend
 		virtual bool step_over() = 0;
 		virtual bool step_out()  = 0;
 
+		virtual void cont()  = 0;
+		virtual void pause() = 0;
+
 		auto retrieve_msg_for_frontend()
 		  -> std::optional<std::unique_ptr<BackToFront::Msg>>
 		{
@@ -48,6 +51,10 @@ namespace dbgui::backend
 		void send_state_change(TargetState new_state, StateChangeReason reason);
 		void send_proc_info(BackToFront::InitialProcessInfo &&);
 		void send_reg_change(BackToFront::RegsChanged &&);
+		void send_thread_change(BackToFront::ThreadChange &&);
+		void send_thread_removed(BackToFront::ThreadRemoved &&);
+		void send_frame_changed(BackToFront::FrameChanged &&);
+		void send_frame_removed(BackToFront::FrameRemoved &&);
 
 		private:
 		std::mutex _back_front_msg_mutex;

src/backend/lldb/lldb_backend.cpp

@@ -112,6 +112,9 @@ void LLDBBackend::handle_state_change(lldb::StateType state)
 		}
 		reg_infos.clear();
 
+		this->check_thread_changes();
+		this->check_frame_changes();
+
 		if (state == StateType::eStateStopped)
 		{
 			this->send_state_change(TargetState::paused,
@@ -124,6 +127,8 @@ void LLDBBackend::handle_state_change(lldb::StateType state)
 	{
 		case eStateStopped:
 			this->check_reg_changes();
+			this->check_thread_changes();
+			this->check_frame_changes();
 			this->send_state_change(TargetState::paused, StateChangeReason::unknown);
 			break;
 		case eStateRunning:
@@ -259,13 +264,15 @@ void LLDBBackend::dump_threads()
 			case eStopReasonSignal:
 			{
 				auto signal_num = thread.GetStopReasonDataAtIndex(0);
-				printf("Thread %lu: TID: %lu, Stop Reason: Signal: %lu\n", i,
+				printf("Thread %lu (%s: %s): TID: %lu, Stop Reason: Signal: %lu\n", i,
-				       thread.GetThreadID(), signal_num);
+				       thread.GetFrameAtIndex(0).GetDisplayFunctionName(),
+				       thread.GetName(), thread.GetThreadID(), signal_num);
 				break;
 			}
 			default:
-				printf("Thread %lu: TID: %lu, Stop Reason: %lu\n", i,
+				printf("Thread %lu (%s: %s): TID: %lu, Stop Reason: %lu\n", i,
-				       thread.GetThreadID(), stop_reason);
+				       thread.GetFrameAtIndex(0).GetDisplayFunctionName(),
+				       thread.GetName(), thread.GetThreadID(), stop_reason);
 		}
 	}
 
@@ -335,6 +342,30 @@ bool LLDBBackend::step_out()
 	return false;
 }
 
+void LLDBBackend::cont()
+{
+	std::lock_guard g{_data_lock};
+	if (!_process)
+	{
+		return;
+	}
+
+	// TODO: error handling
+	_process->Continue();
+}
+
+void LLDBBackend::pause()
+{
+	std::lock_guard g{_data_lock};
+	if (!_process)
+	{
+		return;
+	}
+
+	// TODO: error handling
+	_process->Stop();
+}
+
 void LLDBBackend::check_reg_changes()
 {
 	auto thread = _process->GetSelectedThread();
@@ -405,6 +436,223 @@ void LLDBBackend::check_reg_changes()
 	}
 }
 
+void LLDBBackend::check_thread_changes()
+{
+	using namespace lldb;
+	const auto len = _process->GetNumThreads();
+
+	if (len == 0)
+	{
+		if (!_threads.empty())
+		{
+			for (size_t i = 0; i < _threads.size(); ++i)
+			{
+				this->send_thread_removed(BackToFront::ThreadRemoved{i});
+			}
+			_threads.clear();
+		}
+		return;
+	}
+
+	// TODO: work with SBThread::GetIndexID instead of relying
+	// on the index order?
+	uint16_t cache_idx = 0;
+	for (uint32_t i = 0; i < len; ++i)
+	{
+		auto thread = _process->GetThreadAtIndex(i);
+		if (!thread.IsValid())
+		{
+			continue;
+		}
+
+		auto frame = thread.GetFrameAtIndex(0);
+		if (_threads.size() <= cache_idx)
+		{
+			_threads.push_back(
+			  Thread{.id             = thread.GetThreadID(),
+			         .ip             = frame.GetPC(),
+			         .name           = thread.GetName(),
+			         .cur_display_fn = frame.GetDisplayFunctionName()});
+
+			auto &info = _threads.back();
+			switch (thread.GetStopReason())
+			{
+				case eStopReasonBreakpoint:
+					info.stop_reason = ThreadStopReason::breakpoint;
+					info.stop_extra  = thread.GetStopReasonDataAtIndex(0);
+					break;
+				case eStopReasonWatchpoint:
+					info.stop_reason = ThreadStopReason::watchpoint;
+					info.stop_extra  = thread.GetStopReasonDataAtIndex(0);
+					break;
+				case eStopReasonSignal:
+					info.stop_reason = ThreadStopReason::signal;
+					info.stop_extra  = thread.GetStopReasonDataAtIndex(0);
+					break;
+				case eStopReasonException:
+					info.stop_reason = ThreadStopReason::exception;
+					break;
+				default: info.stop_reason = ThreadStopReason::unknown; break;
+			}
+
+			this->send_thread_change(BackToFront::ThreadChange{
+			  .id             = info.id,
+			  .ip             = info.ip,
+			  .stop_extra     = info.stop_extra,
+			  .idx            = cache_idx,
+			  .stop_reason    = info.stop_reason,
+			  .name           = info.name,
+			  .cur_display_fn = info.cur_display_fn,
+			});
+			cache_idx++;
+			continue;
+		}
+
+		auto &cache_entry = _threads[cache_idx];
+		auto change_entry = BackToFront::ThreadChange{};
+		change_entry.idx  = cache_idx;
+		auto send_change  = false;
+
+		if (thread.GetThreadID() != cache_entry.id)
+		{
+			cache_entry.id = thread.GetThreadID();
+			send_change    = true;
+		}
+		if (frame.GetPC() != cache_entry.ip)
+		{
+			cache_entry.ip = frame.GetPC();
+			send_change    = true;
+		}
+		auto name = std::string_view{thread.GetName()};
+		if (name != cache_entry.name)
+		{
+			change_entry.name = name;
+			send_change       = true;
+		}
+		auto display_name = std::string_view{frame.GetDisplayFunctionName()};
+		if (display_name != cache_entry.cur_display_fn)
+		{
+			change_entry.cur_display_fn = display_name;
+			send_change                 = true;
+		}
+
+		auto stop_reason = cache_entry.stop_reason;
+		auto stop_extra  = cache_entry.stop_extra;
+		switch (thread.GetStopReason())
+		{
+			case eStopReasonBreakpoint:
+				stop_reason = ThreadStopReason::breakpoint;
+				stop_extra  = thread.GetStopReasonDataAtIndex(0);
+				break;
+			case eStopReasonWatchpoint:
+				stop_reason = ThreadStopReason::watchpoint;
+				stop_extra  = thread.GetStopReasonDataAtIndex(0);
+				break;
+			case eStopReasonSignal:
+				stop_reason = ThreadStopReason::signal;
+				stop_extra  = thread.GetStopReasonDataAtIndex(0);
+				break;
+			case eStopReasonException:
+				stop_reason = ThreadStopReason::exception;
+				break;
+			default: stop_reason = ThreadStopReason::unknown; break;
+		}
+		if (stop_reason != cache_entry.stop_reason
+		    || stop_extra != cache_entry.stop_extra)
+		{
+			send_change             = true;
+			cache_entry.stop_reason = stop_reason;
+			cache_entry.stop_extra  = stop_extra;
+		}
+
+		if (send_change)
+		{
+			change_entry.id          = cache_entry.id;
+			change_entry.ip          = cache_entry.ip;
+			change_entry.stop_reason = cache_entry.stop_reason;
+			change_entry.stop_extra  = cache_entry.stop_extra;
+			this->send_thread_change(std::move(change_entry));
+		}
+
+		cache_idx++;
+	}
+
+	if (_threads.size() > cache_idx)
+	{
+		// here cache_idx == num_threads
+		size_t rem_count = _threads.size() - cache_idx;
+		for (size_t i = 0; i < rem_count; ++i)
+		{
+			this->send_thread_removed(
+			  BackToFront::ThreadRemoved{_threads.size() - i - 1});
+			_threads.pop_back();
+		}
+	}
+}
+
+void LLDBBackend::check_frame_changes()
+{
+	using namespace lldb;
+	auto thread = _process->GetSelectedThread();
+	if (!thread.IsValid())
+	{
+		// TODO: cleanup
+		return;
+	}
+
+	size_t len          = thread.GetNumFrames();
+	uint16_t cache_idx  = 0;
+	size_t selected_idx = 0;
+	for (size_t i = 0; i < len; ++i)
+	{
+		auto frame = thread.GetFrameAtIndex(i);
+		if (!frame.IsValid())
+		{
+			continue;
+		}
+
+		if (thread.GetSelectedFrame().IsEqual(frame))
+		{
+			selected_idx = cache_idx;
+		}
+
+		auto ip   = frame.GetPC();
+		auto name = std::string_view{frame.GetDisplayFunctionName()};
+		if (_frames.size() <= cache_idx)
+		{
+			_frames.push_back(Frame{
+			  .ip           = ip,
+			  .display_name = std::string{name},
+			});
+
+			this->send_frame_changed(BackToFront::FrameChanged{
+			  .ip = ip, .idx = cache_idx, .display_name = std::string{name}});
+			cache_idx++;
+			continue;
+		}
+
+		auto &cache_entry = _frames[cache_idx];
+		if (cache_entry.ip != ip || cache_entry.display_name != name)
+		{
+			this->send_frame_changed(BackToFront::FrameChanged{
+			  .ip = ip, .idx = cache_idx, .display_name = std::string{name}});
+		}
+		cache_idx++;
+	}
+
+	if (_frames.size() > cache_idx)
+	{
+		// here cache_idx == num_frames
+		size_t rem_count = _frames.size() - cache_idx;
+		for (size_t i = 0; i < rem_count; ++i)
+		{
+			this->send_frame_removed(
+			  BackToFront::FrameRemoved{_frames.size() - i - 1});
+			_frames.pop_back();
+		}
+	}
+}
+
 /*
 Reg output for x64
 Got register set General Purpose Registers

src/backend/lldb/lldb_backend.h

@@ -14,7 +14,7 @@ namespace dbgui::backend
 	{
 		struct RegSet
 		{
-            std::string set_name;
+			std::string set_name;
 			// map from debugger reg idx to frontend reg idx
 			// std::vector<uint16_t> idx_map;
 			std::vector<const char *> names;
@@ -22,6 +22,22 @@ namespace dbgui::backend
 			std::vector<std::vector<uint8_t>> values;
 		};
 
+		struct Thread
+		{
+			uint64_t id;
+			uint64_t ip;
+			uint64_t stop_extra;
+			ThreadStopReason stop_reason;
+			std::string name;
+			std::string cur_display_fn;
+		};
+
+		struct Frame
+		{
+			uint64_t ip;
+			std::string display_name;
+		};
+
 		// TODO: source_init_file: false
 		LLDBBackend(std::string filename);
 		virtual ~LLDBBackend();
@@ -32,6 +48,9 @@ namespace dbgui::backend
 		bool step_over() override;
 		bool step_out() override;
 
+		void cont() override;
+		void pause() override;
+
 		private:
 		void run_msg_loop();
 		void wait_for_debug_events();
@@ -42,6 +61,8 @@ namespace dbgui::backend
 		                       std::vector<BackToFront::RegsChanged> &);
 		void dump_threads();
 		void check_reg_changes();
+		void check_thread_changes();
+		void check_frame_changes();
 
 		std::string _filename;
 		lldb::SBDebugger _instance;
@@ -55,5 +76,8 @@ namespace dbgui::backend
 		bool _first_run               = true;
 		TargetState _state            = TargetState::stopped;
 		std::vector<RegSet> _reg_sets = {};
+		std::vector<Thread> _threads  = {};
+		std::vector<Frame> _frames    = {};
+		uint16_t _selected_frame      = 0;
 	};
 }  // namespace dbgui::backend

src/frontend/frontend.cpp

@@ -15,6 +15,16 @@ Target::Target(std::string filename)
 	backend = std::make_shared<backend::LLDBBackend>(this->filename.c_str());
 }
 
+Frontend::Frontend()
+{
+	_open_popup_name_buf.resize(512);
+	const char *str = "/home/klee/projects/dbgui/tmp/main";
+	std::memcpy(_open_popup_name_buf.data(), str, strlen(str) + 1);
+	_windows.push_back(Window::create_regs(window_id++));
+	_windows.push_back(Window::create_threads(window_id++));
+	_windows.push_back(Window::create_frames(window_id++));
+}
+
 void Frontend::run_frame()
 {
 	this->handle_msgs();
@@ -38,6 +48,12 @@ void Frontend::run_frame()
 
 	if (ImGui::Begin("Test", nullptr, win_flags))
 	{
+		// TODO: if we just do SetNextWindowDockID in each of the windows
+		// this seems to crash once the first window is docked to it?
+		// so some id change is necessary
+		// so we should try to figure out what the dock id for the "topleft"
+		// window is or whatever and use that for new windows
+		// spawning them floating looks bad (and might reuse saved positions)
 		this->dock_id = ImGui::GetID("MyDockSpace");
 		ImGui::DockSpace(this->dock_id, ImVec2{0, 0},
 		                 ImGuiDockNodeFlags_PassthruCentralNode);
@@ -45,6 +61,7 @@ void Frontend::run_frame()
 		for (auto &window : _windows)
 		{
 			window.draw(*this);
+			//this->dock_id = ImGui::GetWindowDockID();
 		}
 
 		ImGui::End();
@@ -104,8 +121,19 @@ void Frontend::draw_header()
 						break;
 
 					case stopped: ImGui::Button("Run"); break;
-					case paused: ImGui::Button("Continue"); break;
+					case paused:
-					case running: ImGui::Button("Pause"); break;
+						if (ImGui::Button("Continue"))
+						{
+							this->target->backend->cont();
+							// TODO: mark target already as running to prevent input?
+						}
+						break;
+					case running:
+						if (ImGui::Button("Pause"))
+						{
+							this->target->backend->pause();
+						}
+						break;
 				}
 			} else
 			{
@@ -244,6 +272,22 @@ void Frontend::handle_msgs()
 			case regs_changed:
 				this->handle_reg_change(std::get<BackToFront::RegsChanged>(msg->data));
 				break;
+			case thread_changed:
+				this->handle_thread_change(
+				  std::move(std::get<BackToFront::ThreadChange>(msg->data)));
+				break;
+			case thread_removed:
+				this->handle_thread_remove(
+				  std::get<BackToFront::ThreadRemoved>(msg->data));
+				break;
+			case frame_changed:
+				this->handle_frame_change(
+				  std::move(std::get<BackToFront::FrameChanged>(msg->data)));
+				break;
+			case frame_removed:
+				this->handle_frame_remove(
+				  std::get<BackToFront::FrameRemoved>(msg->data));
+				break;
 		}
 	}
 }
@@ -290,4 +334,90 @@ void Frontend::handle_reg_change(const BackToFront::RegsChanged &info)
 		// TODO: opt for uint64?
 		std::copy(val.begin(), val.end(), reg.bytes.begin());
 	}
+}
+
+void Frontend::handle_thread_remove(const BackToFront::ThreadRemoved &info)
+{
+	auto &threads = this->target->threads;
+	if (threads.size() >= info.idx)
+	{
+		return;
+	}
+
+	threads[info.idx] = {};
+}
+
+void Frontend::handle_thread_change(BackToFront::ThreadChange &&info)
+{
+	auto &threads = this->target->threads;
+	if (threads.size() <= info.idx)
+	{
+		threads.resize(info.idx + 1);
+	}
+
+	auto &thread = threads[info.idx];
+	if (!thread)
+	{
+		thread = Target::Thread{
+		  .id          = info.id,
+		  .ip          = info.ip,
+		  .stop_extra  = info.stop_extra,
+		  .stop_reason = info.stop_reason,
+		};
+		if (info.name)
+		{
+			thread->name = std::move(*info.name);
+		}
+		if (info.cur_display_fn)
+		{
+			thread->cur_display_fn = std::move(*info.cur_display_fn);
+		}
+		return;
+	}
+
+	thread->id          = info.id;
+	thread->ip          = info.ip;
+	thread->stop_reason = info.stop_reason;
+	thread->stop_extra  = info.stop_extra;
+	if (info.name)
+	{
+		thread->name = std::move(*info.name);
+	}
+	if (info.cur_display_fn)
+	{
+		thread->cur_display_fn = std::move(*info.cur_display_fn);
+	}
+}
+
+void Frontend::handle_frame_remove(const BackToFront::FrameRemoved &info)
+{
+	auto &frames = this->target->frames;
+	if (frames.size() >= info.idx)
+	{
+		return;
+	}
+
+	frames[info.idx] = {};
+}
+
+void Frontend::handle_frame_change(BackToFront::FrameChanged &&info)
+{
+	auto &frames = this->target->frames;
+	if (frames.size() <= info.idx)
+	{
+		frames.resize(info.idx + 1);
+	}
+
+	auto &frame = frames[info.idx];
+	if (!frame)
+	{
+		frame = Target::Frame{
+		  .ip           = info.ip,
+		  .display_name = info.display_name,
+		};
+		return;
+	}
+
+	frame->ip           = info.ip;
+	frame->display_name = info.display_name;
 }

src/frontend/frontend.h

@@ -17,12 +17,7 @@ namespace dbgui::frontend
 
 	struct Frontend
 	{
-		Frontend()
+		Frontend();
-		{
-			_open_popup_name_buf.resize(512);
-			const char *str = "/home/klee/projects/dbgui/tmp/main";
-			std::memcpy(_open_popup_name_buf.data(), str, strlen(str) + 1);
-		}
 
 		void run_frame();
 
@@ -39,6 +34,10 @@ namespace dbgui::frontend
 		void handle_state_change(const BackToFront::StateChange &);
 		void handle_proc_info(BackToFront::InitialProcessInfo &&);
 		void handle_reg_change(const BackToFront::RegsChanged &);
+		void handle_thread_remove(const BackToFront::ThreadRemoved &);
+		void handle_thread_change(BackToFront::ThreadChange &&);
+		void handle_frame_remove(const BackToFront::FrameRemoved &);
+		void handle_frame_change(BackToFront::FrameChanged &&);
 
 		bool _draw_second = false;
 

src/frontend/target.h

@@ -25,6 +25,22 @@ namespace dbgui::frontend
 			std::vector<Reg> regs;
 		};
 
+		struct Thread
+		{
+			uint64_t id;
+			uint64_t ip;
+			uint64_t stop_extra;
+			ThreadStopReason stop_reason;
+			std::string name;
+			std::string cur_display_fn;
+		};
+
+		struct Frame
+		{
+			uint64_t ip;
+			std::string display_name;
+		};
+
 		Target(std::string filename);
 
 		TargetState state = TargetState::stopped;
@@ -33,6 +49,8 @@ namespace dbgui::frontend
 		Arch arch;
 
 		std::vector<RegSet> reg_sets;
+		std::vector<std::optional<Thread>> threads;
+		std::vector<std::optional<Frame>> frames;
 
 		std::shared_ptr<backend::Backend> backend = nullptr;
 	};

src/frontend/window.cpp

@@ -11,6 +11,8 @@ void Window::draw(const Frontend &frontend)
 		using enum WindowType;
 
 		case regs: std::get<RegWindow>(this->data).draw(frontend); break;
+		case threads: std::get<ThreadWindow>(this->data).draw(frontend); break;
+		case frames: std::get<FrameWindow>(this->data).draw(frontend); break;
 		default: printf("Unhandled window draw: %u\n", this->type); exit(1);
 	}
 }
@@ -24,9 +26,27 @@ Window Window::create_regs(size_t id)
 	              .data = RegWindow{.id = id_str, .open = true}};
 }
 
+Window Window::create_threads(size_t id)
+{
+	auto id_str = std::string{"Threads##"};
+	id_str.append(std::to_string(id));
+
+	return Window{.type = WindowType::threads,
+	              .data = ThreadWindow{.id = id_str, .open = true}};
+}
+
+Window Window::create_frames(size_t id)
+{
+	auto id_str = std::string{"Frames##"};
+	id_str.append(std::to_string(id));
+
+	return Window{.type = WindowType::frames,
+	              .data = FrameWindow{.id = id_str, .open = true}};
+}
+
 void RegWindow::draw(const Frontend &frontend)
 {
-	ImGui::SetNextWindowDockID(frontend.dock_id, ImGuiCond_Appearing);
+	//ImGui::SetNextWindowDockID(frontend.dock_id, ImGuiCond_Appearing);
 	if (!ImGui::Begin(this->id.c_str()))
 	{
 		return;
@@ -97,5 +117,112 @@ void RegWindow::draw(const Frontend &frontend)
 		ImGui::EndTable();
 	}
 
+	ImGui::End();
+}
+
+void ThreadWindow::draw(const Frontend &frontend)
+{
+	//ImGui::SetNextWindowDockID(frontend.dock_id, ImGuiCond_Appearing);
+	if (!ImGui::Begin(this->id.c_str()))
+	{
+		return;
+	}
+
+	if (!frontend.target)
+	{
+		ImGui::End();
+		return;
+	}
+
+	if (ImGui::BeginTable("table", 3,
+	                      ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg))
+	{
+		ImGui::TableSetupColumn("ID");
+		ImGui::TableSetupColumn("Name");
+		ImGui::TableSetupColumn("Location");
+		ImGui::TableHeadersRow();
+
+		const auto &threads = frontend.target->threads;
+		char buf[32];
+		for (size_t idx = 0; idx < threads.size(); ++idx)
+		{
+			const auto &thread = threads[idx];
+			if (!thread)
+			{
+				continue;
+			}
+
+			ImGui::TableNextRow();
+			ImGui::TableSetColumnIndex(0);
+
+			std::snprintf(buf, sizeof(buf), "%lu", thread->id);
+			ImGui::Text(buf);
+			ImGui::TableNextColumn();
+
+			ImGui::Text(thread->name.c_str());
+			ImGui::TableNextColumn();
+
+			if (thread->cur_display_fn != "")
+			{
+				ImGui::Text(thread->cur_display_fn.c_str());
+			} else
+			{
+				std::snprintf(buf, sizeof(buf), "%lX", thread->ip);
+				ImGui::Text(buf);
+			}
+		}
+
+		ImGui::EndTable();
+	}
+
+	ImGui::End();
+}
+
+void FrameWindow::draw(const Frontend &frontend)
+{
+	//ImGui::SetNextWindowDockID(frontend.dock_id, ImGuiCond_Appearing);
+	if (!ImGui::Begin(this->id.c_str()))
+	{
+		return;
+	}
+
+	if (!frontend.target)
+	{
+		ImGui::End();
+		return;
+	}
+
+	if (ImGui::BeginTable("table", 1,
+	                      ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg))
+	{
+		ImGui::TableSetupColumn("Location");
+		ImGui::TableHeadersRow();
+
+		const auto &frames = frontend.target->frames;
+		char buf[32];
+		for (size_t idx = 0; idx < frames.size(); ++idx)
+		{
+			const auto &frame = frames[idx];
+			if (!frame)
+			{
+				continue;
+			}
+
+			ImGui::TableNextRow();
+			ImGui::TableSetColumnIndex(0);
+
+			if (frame->display_name != "")
+			{
+				ImGui::Text(frame->display_name.c_str());
+			} else
+			{
+				std::snprintf(buf, sizeof(buf), "%lX", frame->ip);
+				ImGui::Text(buf);
+			}
+		}
+
+		ImGui::EndTable();
+	}
+
 	ImGui::End();
 }

src/frontend/window.h

@@ -17,7 +17,7 @@ namespace dbgui::frontend
 		source,
 		memory,
 		variables,
-		stack,
+		frames,
 		threads,
 		disassembly,
 	};
@@ -55,13 +55,31 @@ namespace dbgui::frontend
 		bool open;
 	};
 
+	struct ThreadWindow
+	{
+		void draw(const Frontend &);
+
+		std::string id;
+		bool open;
+	};
+
+	struct FrameWindow
+	{
+		void draw(const Frontend &);
+
+		std::string id;
+		bool open;
+	};
+
 	struct Window
 	{
 		WindowType type;
-		std::variant<std::monostate, RegWindow> data;
+		std::variant<std::monostate, RegWindow, ThreadWindow, FrameWindow> data;
 
 		void draw(const Frontend &);
 
 		static Window create_regs(size_t window_id);
+		static Window create_threads(size_t window_id);
+		static Window create_frames(size_t window_id);
 	};
 }  // namespace dbgui::frontend

src/msg.h

@@ -4,6 +4,7 @@
 #include <string>
 #include <variant>
 #include <vector>
+#include <optional>
 
 namespace dbgui
 {
@@ -31,6 +32,15 @@ namespace dbgui
 		// x86
 	};
 
+	enum class ThreadStopReason : uint8_t
+	{
+		unknown,
+		breakpoint,
+		watchpoint,
+		signal,
+		exception,
+	};
+
 	namespace FrontToBack
 	{
 		enum class MsgType : uint8_t
@@ -52,6 +62,12 @@ namespace dbgui
 			ip_change,
 			initial_proc_info,
 			regs_changed,
+			// TODO: thread_added?
+			thread_changed,
+			thread_removed,
+			frame_changed,
+			frame_removed,
+			// TODO: frame_moved, frame_added, etc?
 		};
 
 		struct StateChange
@@ -84,11 +100,40 @@ namespace dbgui
 			std::vector<std::pair<uint16_t, std::vector<uint8_t>>> changes;
 		};
 
+		struct ThreadChange
+		{
+			uint64_t id;
+			uint64_t ip;
+			uint64_t stop_extra;
+			uint16_t idx;
+			ThreadStopReason stop_reason;
+			std::optional<std::string> name;
+			std::optional<std::string> cur_display_fn;
+		};
+
+		struct ThreadRemoved
+		{
+			size_t idx;
+		};
+
+		struct FrameChanged
+		{
+			uint64_t ip;
+			uint16_t idx;
+			std::string display_name;
+		};
+
+		struct FrameRemoved
+		{
+			size_t idx;
+		};
+
 		struct Msg
 		{
 			MsgType type;
 			std::variant<std::monostate, StateChange, IPChange, InitialProcessInfo,
-			             RegsChanged>
+			             RegsChanged, ThreadChange, ThreadRemoved, FrameChanged,
+			             FrameRemoved>
 			  data;
 		};
 	}  // namespace BackToFront

tmp/main.c

@@ -1,5 +1,11 @@
 #include <stdint.h>
+#include <unistd.h>
 
 int main(int argc, char* argv[]) {
+	int tmp = 10;
+	while (tmp != 0) {
+		sleep(1);
+		tmp--;
+	}
 	return 0;
 }