Limit propagation of error to handlers to 6 consecutive errors

Author: Johnny-the-happy-coder

core/error/error_macros.cpp

@@ -40,6 +40,14 @@
 #include "scene/main/node.h"
 #endif
 
+int repetitions_last_line = -1;
+const char *repetitions_last_function = NULL;
+// No need to initialize: by constructon, can never be checked if line/function don't match.
+char repetitions_last_message[256];
+int repetitions_last_message_count = 0;
+const int MAX_LOG_MESSAGE_REPETITIONS = 6;
+const char *REPETITIONS_WARNING_MESSAGE = "Last message repeated 6 times...";
+
 static ErrorHandlerList *error_handler_list = nullptr;
 
 void add_error_handler(ErrorHandlerList *p_handler) {
@@ -98,6 +106,25 @@ void _err_print_error(const char *p_function, const char *p_file, int p_line, co
 	}
 
 	_global_lock();
+
+	if (repetitions_last_line == p_line && repetitions_last_function == p_function && ::strcmp(p_message, repetitions_last_message) == 0) {
+		if (repetitions_last_message_count == MAX_LOG_MESSAGE_REPETITIONS) {
+			p_message = REPETITIONS_WARNING_MESSAGE;
+			repetitions_last_message_count += 1; // avoid rollover errors
+		} else if (repetitions_last_message_count < MAX_LOG_MESSAGE_REPETITIONS) {
+			repetitions_last_message_count += 1;
+		} else {
+			_global_unlock();
+			return;
+		}
+	} else {
+		repetitions_last_message_count = 0;
+		repetitions_last_line = p_line;
+		repetitions_last_function = p_function;
+		// The message memory lifetime may end after this call.
+		::strncpy(repetitions_last_message, p_message, sizeof(repetitions_last_message));
+	}
+
 	ErrorHandlerList *l = error_handler_list;
 	while (l) {
 		l->errfunc(l->userdata, p_function, p_file, p_line, p_error, p_message, p_editor_notify, p_type);