regs and we can step into!

src/backend/lldb/lldb_backend.h

@@ -5,19 +5,55 @@
 #include <lldb/API/SBTarget.h>
 #include <lldb/API/SBProcess.h>
 #include <string>
+#include <thread>
+#include <mutex>
 
-namespace dbgui::backend {
-    struct LLDBBackend : Backend {
-        // TODO: source_init_file: false
-        LLDBBackend(std::string filename);
-        virtual ~LLDBBackend();
+namespace dbgui::backend
+{
+	struct LLDBBackend : Backend
+	{
+		struct RegSet
+		{
+            std::string set_name;
+			// map from debugger reg idx to frontend reg idx
+			// std::vector<uint16_t> idx_map;
+			std::vector<const char *> names;
+			// TODO: make this data structure not garbage
+			std::vector<std::vector<uint8_t>> values;
+		};
 
-        void start() override;
+		// TODO: source_init_file: false
+		LLDBBackend(std::string filename);
+		virtual ~LLDBBackend();
 
-        private:
-            std::string _filename;
-            lldb::SBDebugger _instance;
-            lldb::SBTarget _target;
-            std::optional<lldb::SBProcess> _process;
-    };
-}
+		void start() override;
+
+		bool step_into() override;
+		bool step_over() override;
+		bool step_out() override;
+
+		private:
+		void run_msg_loop();
+		void wait_for_debug_events();
+
+		void handle_state_change(lldb::StateType);
+
+		void prepare_proc_info(BackToFront::InitialProcessInfo &,
+		                       std::vector<BackToFront::RegsChanged> &);
+		void dump_threads();
+		void check_reg_changes();
+
+		std::string _filename;
+		lldb::SBDebugger _instance;
+
+		std::mutex _data_lock;
+		lldb::SBTarget _target;
+		std::optional<lldb::SBProcess> _process;
+		std::thread _msg_thread;
+
+		// process state
+		bool _first_run               = true;
+		TargetState _state            = TargetState::stopped;
+		std::vector<RegSet> _reg_sets = {};
+	};
+}  // namespace dbgui::backend