Add command line debugger

src/debugger/debugger.h

@@ -0,0 +1,76 @@
+#ifndef _DEBUGGER_H_
+#define _DEBUGGER_H_
+
+#ifdef ENABLE_DEBUGGER
+
+#include <memory>
+#include <stdarg.h>
+#include "config.h"
+#include "debugger/debug_info.h"
+
+namespace debugger {
+
+const uint8_t BREAKPOINT_INSTRUCTION = 0x0f;
+
+class Frontend;
+
+enum class State {
+	RUNNING,
+	STOPPED_ENTRY,
+	STOPPED_STEP,
+	STOPPED_NEXT,
+	STOPPED_BREAKPOINT,
+	STOPPED_INTERRUPT,
+	STOPPED_EXCEPTION,
+};
+
+struct StackFrame {
+	int page;
+	int addr;
+	const char *src;
+	int line;
+
+	StackFrame(int page, int addr, const char *src, int line)
+		: page(page), addr(addr), src(src), line(line) {}
+};
+
+class Debugger {
+public:
+	Debugger(const char *symbols_path, DebuggerMode mode);
+	~Debugger();
+	void repl(int bp_no);
+
+	// API for VM
+	bool trapped() const { return state != State::RUNNING; }
+	void on_sleep();
+	void on_palette_change();
+	uint8_t handle_breakpoint(int page, int addr);
+	bool console_vprintf(int lv, const char *format, va_list ap);
+	void post_command(void *data);
+
+	// API for frontend
+	State get_state() const { return state; }
+	void set_state(State s) { state = s; }
+	int set_breakpoint(int page, int addr, bool is_internal);
+	bool delete_breakpoint(int no);
+	void delete_breakpoints_in_page(int page);
+	void stepin();
+	void stepout();
+	void next();
+	std::vector<StackFrame> stack_trace();
+
+private:
+	State state = State::RUNNING;
+	DebugInfo symbols;
+	std::unique_ptr<Frontend> frontend;
+
+	void do_next();
+};
+
+} // namespace debugger
+
+extern std::unique_ptr<debugger::Debugger> g_debugger;
+
+#endif // ENABLE_DEBUGGER
+
+#endif /* _DEBUGGER_H_ */