struct function;
struct eh_status;
struct eh_region;
extern int doing_eh (int);
extern void note_eh_region_may_contain_throw (struct eh_region *);
extern void note_current_region_may_contain_throw (void);
extern void for_each_eh_label (void (*) (rtx));
extern void for_each_eh_region (void (*) (struct eh_region *));
extern bool can_throw_internal_1 (int);
extern bool can_throw_internal (rtx);
extern bool can_throw_external_1 (int);
extern bool can_throw_external (rtx);
extern void set_nothrow_function_flags (void);
extern void finish_eh_generation (void);
extern void init_eh (void);
extern void init_eh_for_function (void);
extern rtx reachable_handlers (rtx);
extern void maybe_remove_eh_handler (rtx);
extern void convert_from_eh_region_ranges (void);
extern void convert_to_eh_region_ranges (void);
extern void find_exception_handler_labels (void);
extern bool current_function_has_exception_handlers (void);
extern void output_function_exception_table (void);
extern void expand_builtin_unwind_init (void);
extern rtx expand_builtin_eh_return_data_regno (tree);
extern rtx expand_builtin_extract_return_addr (tree);
extern void expand_builtin_init_dwarf_reg_sizes (tree);
extern rtx expand_builtin_frob_return_addr (tree);
extern rtx expand_builtin_dwarf_sp_column (void);
extern void expand_builtin_eh_return (tree, tree);
extern void expand_eh_return (void);
extern rtx expand_builtin_extend_pointer (tree);
extern rtx get_exception_pointer (struct function *);
extern rtx get_exception_filter (struct function *);
extern int check_handled (tree, tree);
extern void sjlj_emit_function_exit_after (rtx);
extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
struct eh_region *);
extern struct eh_region *gen_eh_region_try (struct eh_region *);
extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
extern int get_eh_region_number (struct eh_region *);
extern bool get_eh_region_may_contain_throw (struct eh_region *);
extern tree get_eh_region_tree_label (struct eh_region *);
extern void set_eh_region_tree_label (struct eh_region *, tree);
extern void foreach_reachable_handler (int, bool,
void (*) (struct eh_region *, void *),
void *);
extern void collect_eh_region_array (void);
extern void expand_resx_expr (tree);
extern int lookup_stmt_eh_region (tree);
extern tree (*lang_protect_cleanup_actions) (void);
extern int (*lang_eh_type_covers) (tree a, tree b);
extern tree (*lang_eh_runtime_type) (tree);
#ifndef MUST_USE_SJLJ_EXCEPTIONS
# if !(defined (EH_RETURN_DATA_REGNO) \
&& (defined (TARGET_UNWIND_INFO) \
|| (DWARF2_UNWIND_INFO \
&& (defined (EH_RETURN_HANDLER_RTX) \
|| defined (HAVE_eh_return)))))
# define MUST_USE_SJLJ_EXCEPTIONS 1
# else
# define MUST_USE_SJLJ_EXCEPTIONS 0
# endif
#endif
#ifdef CONFIG_SJLJ_EXCEPTIONS
# if CONFIG_SJLJ_EXCEPTIONS == 1
# define USING_SJLJ_EXCEPTIONS 1
# endif
# if CONFIG_SJLJ_EXCEPTIONS == 0
# define USING_SJLJ_EXCEPTIONS 0
# ifndef EH_RETURN_DATA_REGNO
#error "EH_RETURN_DATA_REGNO required"
# endif
# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
#error "EH_RETURN_HANDLER_RTX or eh_return required"
# endif
# if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
#error "{DWARF2,TARGET}_UNWIND_INFO required"
# endif
# endif
#else
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
#endif