struct RNode;

VALUE ruby_debug_print_value(int level, int debug_level, const char *header, VALUE v);

ID ruby_debug_print_id(int level, int debug_level, const char *header, ID id);

struct RNode *ruby_debug_print_node(int level, int debug_level, const char *header, const struct RNode *node);

int ruby_debug_print_indent(int level, int debug_level, int indent_level);

void ruby_debug_gc_check_func(void);

void ruby_set_debug_option(const char *str);